t t a s t a n d a r d 5 overall architecture the e-utran for the p5g trial consists of enbs and 5g...

정보통신단체표준(잠정표준)

T T

A S

t a n

d a

r d

정보통신단체표준(잠정표준) 제정일: 2017년 06월 28일

TTAI.KO-06.0448

5G 시범 서비스를 위한 통신

시스템 - 평창 올림픽

Communication System for 5G Trial

Service - PyeongChang Olympic Games

표준초안 검토 위원회 IMT 프로젝트그룹(PG906)

표준안 심의 위원회 전파/이동통신 기술위원회(TC9)

성명 소 속 직위 위원회 및 직위 표준번호

표준(과제) 제안 이동준 KT 팀장 PG 906 위원

표준 초안 작성자 김일환 KT 차장 PG 906 위원 TTAI.KO-06.0448

사무국 담당 김대중 TTA 부장 -

조영익 TTA 책임 -

본 문서에 대한 저작권은 TTA에 있으며, TTA와 사전 협의 없이 이 문서의 전체 또는 일부를 상업적 목적으로 복제 또는

배포해서는 안 됩니다.

본 표준 발간 이전에 접수된 지식재산권 확약서 정보는 본 표준의 ‘부록(지식재산권 확약서 정보)’에 명시하고 있으며, 이후

접수된 지식재산권 확약서는 TTA 웹사이트에서 확인할 수 있습니다.

본 표준과 관련하여 접수된 확약서 외의 지식재산권이 존재할 수 있습니다.

발행인 : 한국정보통신기술협회 회장

발행처 : 한국정보통신기술협회

13591, 경기도 성남시 분당구 분당로 47

Tel : 031-724-0114, Fax : 031-724-0109

발행일 : 2017.06


TTAI.KO-06.0448 i

서 문

1 표준의 목적

이 표준은 평창 올림픽 5G 시범 서비스를 지원하기 통신 시스템의 규격을 정의한다. 또한

28GHz 5G 서비스에 최적화된 무선 기술을 정의하여 향후 대한민국 5G 후보 주파수인

28GHz 관련 산업 생태계 발전에 이바지 하는 것을 목적으로 한다.

2 주요 내용 요약

이 표준은 평창 올림픽 5G 시범 서비스를 지원하기 위한 통신 시스템 무선 접속 방식 및

네트워크 구조를 정의한다. 이 표준은 eMBB 서비스를 위한 고속 데이터 전송 및 저지연 무선

전송 기술 내용이 정의되어 있으며, 28GHz 대역 동작 목적으로 설계되어 있다.

3 인용 표준과의 비교

3.1 인용 표준과의 관련성

- 해당 사항 없음

3.2 인용 표준과 본 표준의 비교표



TTAI.KO-06.0448 ii

Preface

1 Purpose

This standard is to define the communication system for 5G Trial Service in PyeongChang

2018 Winter Olympics.

2 Summary

This standard defines the communication system for 5G Trial Service in PyeongChang

2018 Winter Olympics. This standard describes wireless and core technology to meet the

peak speed and latency requirement which was defined in ITU-R for 5G. Also wireless

technology in this standard is optimized in the 28GHz band which will be used for

PyeongChang 2018 Winter Olympics 5G trial service.

3 Relationship to Reference Standards

- None.


TTAI.KO-06.0448 iii

Contents

1 scope ···························································································· 1

2 Reference ······················································································· 1

3 Definitions ······················································································· 1

4. Abbreviations ···················································································· 2

5 Overall architecture ·············································································· 4

5.1 Functional Split ················································································ 4

5.2 Radio Protocol architecture ································································· 5

6 Physical Layer for 5G ··········································································· 6

6.1 Frame structure ················································································ 6

6.2 Uplink ·························································································· 7

6.3 Downlink ······················································································· 40

6.4 Generic functions ············································································ 83

6.5 Timing ·························································································· 86

7 Layer 2 ··························································································· 87

7.1 MAC Sublayer ················································································· 87

7.2 RLC Sublayer ················································································· 89

7.3 PDCP Sublayer ··············································································· 89

7.4 SWI/SPL Sublayer ············································································ 90

8 RRC ······························································································· 91

8.1 Services and Functions ····································································· 91

8.2 RRC protocol states & state transitions ·················································· 91

8.3 Transport of NAS messages ································································ 92

8.4 System Information ·········································································· 92

8.5 Transport of 5G RRC messages ··························································· 92


TTAI.KO-06.0448 iv

9 5G Radio identities ············································································· 93

10 ARQ and HARQ ················································································ 94

10.1 HARQ principles ············································································ 94

10.2 ARQ principles ·············································································· 95

11 Mobility ························································································· 96

11.1 Intra E-UTRAN ·············································································· 96

11.2 Inter RAT ··················································································· 104

12 Scheduling and Rate Control ······························································ 105

12.1 Basic Scheduler Operation ······························································ 105

12.2 Measurements to Support Scheduler Operation ····································· 106

12.3 Rate Control of GBR, MBR and UE-AMBR ··········································· 107

12.4 CSI reporting for Scheduling ···························································· 108

12.5 Explicit Congestion Notification ························································ 108

13 DRX ··························································································· 109

14 QoS ··························································································· 110

15 Security ······················································································· 111

15.1 Overview and Principles ································································· 111

15.2 Security termination points ······························································ 112

15.3 5G Cell Removal ·········································································· 112

16 Radio Resource Management aspects ·················································· 113

17 UE capabilities ··············································································· 115

18 S1 Interface ················································································· 116

19. X2 Interface ················································································ 117


TTAI.KO-06.0448 v

부록 Ⅰ-1 지식재산권 확약서 정보 ························································· 118

Ⅰ-2 시험인증 관련 사항 ······························································ 119

Ⅰ-3 본 표준의 연계(family) 표준 ···················································· 120

Ⅰ-4 참고 문헌 ·········································································· 121

Ⅰ-5 영문표준 해설서 ·································································· 122

Ⅰ-6 표준의 이력 ······································································· 125


１ TTAI.KO-06.0448

5G 시범 서비스를 위한 통신 시스템 - 평창 올림픽

(Communication System for 5G Trial Service - PyeongChang

Olympic Games)

1 Scope

The present document provides an overview and overall description of the radio interface

protocol architecture for the PyeongChang 5G trial (P5G).

2 References

None

3 Definitions

3.1 PLMN ID

The PLMN ID used in the LTE network.

3.2 LTE area

Tracking areas where only EPS services can be provided.

3.3 LTE UE

Normal LTE UE that is not participating the PyeongChang 5G trial.

3.4 Non-P5G cell

LTE cell broadcasting the PLMN ID but not the P5G Trial PLMN ID.

3.5 P5G cell

LTE cell broadcasting both the PLMN ID and the P5G Trial PLMN ID.

3.6 P5G Trial PLMN ID

PLMN ID different from the PLMN ID.


TTAI.KO-06.0448 ２

3.7 P5G UE

Enhanced UE that can support the extensions needed to participate the PyeongChang 5G

trial.

3.8 P5G area

Tracking areas where 5G trial services can be provided.

4 Abbreviations

BRS Beam measurement Reference Signal

BPSK Binary Phase Shift Keying

BRRS Beam Refinement Reference Signal

CCE Control Channel Element

CDD Cyclic Delay Diversity

CP Cyclic Prefix

CQI Channel Quality Indicator

CRC Cyclic Redundancy Check

CSI Channel State Information

PCRS Phase Noise Compensation Reference Signal

CSI Channel-State Information

DCI Downlink Control Information

DM-RS Demodulation Reference Signal

ePLMN Equivalent PLMN

5G Node 5G Node

5G RA 5G Radio Access

HARQ Hybrid Automatic Repeat Request

LTE Long Term Evolution

MAC Medium Access Control

MBSFN Multicast/Broadcast over Single Frequency Network

MIMO Multiple Input Multiple Output

MCC Mobile Country Code

MNC Mobile Network Code

OFDM Orthogonal Frequency Division Multiplexing

P5G PyeongChang 5G

PLMN Public Land Mobile Network


TTAI.KO-06.0448 ３

PLMN ID PLMN Identity (MCC + MNC)

RPLMN Registered PLMN

xPBCH 5G Physical Broadcast Channel

xPDSCH 5G Physical Downlink Shared Channel

xPDCCH 5G Physical Downlink Control Channel

xPRACH 5G Physical Random Access Channel

xPUCCH 5G Physical Uplink Control Channel

xPUSCH 5G Physical Uplink Shared Channel

QAM Quadrature Amplitude Modulation

QPP Quadratic Permutation Polynomial

QPSK Quadrature Phase Shift Keying

RLC Radio Link Control

RRC Radio Resource Control

RSSI Received Signal Strength Indicator

RSRP Reference Signal Received Power

RSRQ Reference Signal Received Quality

SAP Service Access Point

TDD Time Division Duplex

TX Diversity Transmit Diversity

UE User Equipment

REG Resource-Element Group

SCG Secondary Cell Group

SRS Sounding Reference Signal

VRB Virtual Resource Block

BRS Beam measurement Reference Signal

BPSK Binary Phase Shift Keying


TTAI.KO-06.0448 ４

5 Overall architecture

The E-UTRAN for the P5G trial consists of eNBs and 5G Nodes, providing the user

plane (PDCP/RLC/MAC/PHY) and control plane (RRC) protocol terminations towards

the UE. The eNBs are interconnected with each other by means of the X2 interface.

The eNBs are also connected by means of the S1 interface to the EPC (Evolved

Packet Core), more specifically to the MME (Mobility Management Entity) by means of

the S1-MME and to the Serving Gateway (S-GW) by means of the S1-U. The 5G

Nodes are connected by means of the S1-U interface to the S-GW, but are not

connected to the MME via S1-MME. A 5G Node and an eNB are interconnected by

means of the X2 interface, see clause 19.

The interface interconnecting the 5G Nodes is FFS.

The corresponding architecture is illustrated on (Figure 5-1) below.

eNB

MME

S-GW

5G Node

eNB

S1-MM

E

S1-U

S1-MM

E

S1-U

X2

X2X2

E-UTRAN

EPC

S1-U

(Figure 5-1) Overall Architecture

5.1 Functional Split

The eNB, MME, S-GW and PDN Gateway (P-GW) hosts the same functions as in LTE

(see 3GPP TS 36.300 and TS 23.401). The 5G Node hosts the following functions:

- Functions for Radio Resource Management: Radio Bearer Control, Radio

Admission Control, Connection Mobility Control, Dynamic allocation of resources

to UEs in both uplink and downlink (scheduling);


TTAI.KO-06.0448 ５

- Encryption of user data stream;

- Routing of User Plane data towards Serving Gateway;

- Transmission of system information;

- Measurement and measurement reporting configuration for mobility and scheduling.

5.2 Radio Protocol architecture

5.2.1 User plane

The (figure 5-2) below shows the protocol stack for the user-plane, assuming dual

connectivity between LTE and 5G. On the LTE side, the PDCP, RLC and MAC

sublayers perform the same functions as in LTE listed in 3GPP TS 36.300. On the 5G

side, the SWI/SPL, PDCP, RLC and MAC sublayers perform the functions listed in

subclause 7.

eNB

PDCP

RLC

5G Node

PDCP

RLC

MAC

RLC

MAC

PDCP

SWI/SPL

(Figure 5-2) Radio Protocol Architecture for Dual Connectivity between LTE and 5G

5.2.2 Control plane

The figure below shows the protocol stack for the control-plane, where:

- At the eNB, PDCP, RLC and MAC sublayers perform the same functions as listed

in 3GPP TS 36.300;

- LTE RRC (terminated in eNB on the network side) performs the same functions as

listed in 3GPP TS 36.300;

- 5G RRC signalling always uses LTE radio resources to be transmitted and uses a

specific DRB for that purpose;

- 5G RRC performs the functions listed in subclause 8, e.g.:

5G RRC connection management;

5G mobility;


TTAI.KO-06.0448 ６

5G security control.

eNB

PDCP

RLC

RRCSRB

5G Node

DRB

5G RRC

PDCP

RLC

MAC

(Figure 5-3) Control-plane protocol stack

6 Physical Layer for 5G

6.1 Frame structure

Throughout this specification, unless otherwise noted, the size of various fields in the

time domain is expressed as a number of time units ( )2048750001s ×=T seconds.

Each radio frame is ms 101536000 sf =⋅= TT

long and consists of 100 slots of

length ms 1.0T15360 sslot =⋅=T , numbered from 0 to 99. A subframe is defined as two

consecutive slots where subframe i consists of slots i2 and 12 +i .

Subframes can be dynamically used for downlink and uplink transmission with

exception of control subframes used for synchronization, cell and beam search, and

random access.

The first OFDM symbol in all other subframes is reserved for downlink transmission.

A UE treats all OFDM symbols in a subframe as downlink except for OFDM symbols

where it has been explicitly instructed to transmit in the uplink.

A UE is not expected to receive in the downlink during the OFDM symbol prior to an

uplink transmission which forms a guard period for UL-DL switch and timing advance.

A UE is not expected to receive in the downlink in any OFDM symbol where it is

scheduled for uplink transmission on at least one component carrier.


TTAI.KO-06.0448 ７

One slot, Tslot=15360Ts

One radio frame, Tf = 1536000Ts = 10 ms

One subframe, 30720Ts

Subframe #2 Subframe #3 Subframe #4Subframe #0 Subframe #5 Subframe #47 Subframe #48 Subframe #49Subframe #1 …

(Figure 6-1) Frame structure

The supported subframe configurations are listed in <Table 6-1>. Subframes denoted

by broadcast subframe index are used for the transmission of xPBCH, PSS, SSS, ESS,

and BRS. Subframes denoted by index of KRACH and KePBCH are respectively used

for the transmission of RACH and ePBCH.

Subframes indicated as data subframe are comprised

a. DL control channel and DL data channel, or

b. DL control channel, DL data channel and UL control channel, or

c. DL control channel and UL data channel, or

d. DL control channel, UL data channel and UL control channel.

The supported data subframe configurations are listed in <Table 6-2>, where for each

symbol in a subframe, “Dc” denotes a downlink symbol reserved for downlink control

channel transmissions, “Dd” denotes a downlink symbols reserved for downlink data

channel transmissions and , “Uc” denotes a uplink symbol reserved for uplink control

channel transmissions, “Ud” denotes a uplink symbols reserved for uplink data

channel transmissions, and “GP” denotes a symbol reserved for guard period between

downlink and uplink transmissions. CSI-RS and BRRS are respectively denoted by

C.RS and B.RS.

<Table 6-1> Subframe configurations

Control subframes Data subframes

PSS/SSS/ESS/BRS/xPBCH, RACH, ePBCH(*) Configurations in

<Table 6-2> (*) Systems supporting stand-alone operations have ePBCH subframes.


TTAI.KO-06.0448 ８

<Table 6-2> Example configurations for data subframe structure

Configu

-rations

Symbol index

0 1 2 3 4 5 6 7 8 9 10 11 12 13

0 Dc Dd Dd Dd Dd Dd Dd Dd Dd Dd Dd Dd Dd Dd

C.RS C.RS

1 Dc Dd Dd Dd Dd Dd Dd Dd Dd Dd Dd Dd GP Uc

SRS

2 Dc Dc Dd Dd Dd Dd Dd Dd Dd Dd Dd Dd Dd Dd

C.RS C.RS

3 Dc Dc Dd Dd Dd Dd Dd Dd Dd Dd Dd Dd GP Uc

SRS

4 Dc GP Ud Ud Ud Ud Ud Ud Ud Ud Ud Ud Ud Ud

5 Dc GP Ud Ud Ud Ud Ud Ud Ud Ud Ud Ud Ud Uc

SRS

6 Dc GP Ud Ud Ud Ud Ud Ud Ud Ud Ud Ud Ud C.RS

7 Dc GP Ud Ud Ud Ud Ud Ud Ud Ud Ud Ud SRS C.RS

8 Dc GP Ud Ud Ud Ud Ud Ud Ud Ud Ud Ud SRS Uc

9 Dc -/Dc B.RS B.RS B.RS B.RS B.RS B.RS B.RS B.RS B.RS B.RS GP Uc

SRS

10 Dc -

/Dc

B.R

S

B.R

S

B.R

S

B.R

S

B.R

S

B.R

S

B.R

S

B.R

S

B.R

S

B.R

S

C.R

S

C.R

S

6.2 Uplink

6.2.1 Overview

The smallest resource unit for uplink transmissions is denoted a resource element and

is defined in clause 6.2.2.2

6.2.1.1 Physical channels

The following uplink physical channels are defined:

- Physical Uplink Shared Channel, xPUSCH

- Physical Uplink Control Channel, xPUCCH

- Physical Random Access Channel, xPRACH

6.2.1.2 Physical signals

An uplink physical signal is used by the physical layer but does not carry information

originating from higher layers. The following uplink physical signals are defined:

- Reference signal


TTAI.KO-06.0448 ９

6.2.2 Slot structure and physical resources

6.2.2.1 Resource grid

The transmitted signal in each slot is described by one or several resource grids of

1200RBsc

ULRB =NN subcarriers and 7UL

symb =N OFDM symbols. The resource grid is

illustrated in (Figure 6-2).

An antenna port is defined such that the channel over which a symbol on the antenna

port is conveyed can be inferred from the channel over which another symbol on the

same antenna port is conveyed. There is one resource grid per antenna port. The

antenna ports used for transmission of a physical channel or signal depends on the

number of antenna ports configured for the physical channel or signal as shown in

<Table 6-3>. The index p~ is used throughout clause 5 when a sequential numbering

of the antenna ports is necessary.

ULsymbN OFDM symbols

One uplink slot slotT

0=l 1ULsymb −= Nl

RB

scU

LR

BN

N×

subc

arrie

rs

RB

scN

subc

arrie

rs

RBsc

ULsymb NN ×

Resource blockresource elements

Resource element ),( lk

0=k

1RBsc

ULRB −= NNk

(Figure 6-2) Uplink resource grid


TTAI.KO-06.0448 １０

<Table 6-3> Antenna ports used for different physical channels and signals

Physical channel or signal Index p~

Antenna port number p as a function of

the number of antenna ports configured

for the respective physical channel/signal

1 2 4

xPUSCH

0 - - 40

1 - - 41

2 - - 42

3 - - 43

SRS

0 - - 40

1 - - 41

2 - - 42

3 - - 43

xPUCCH 0 100 200 -

1 - 201 -

PCRS

0 40

1 41

2 42

3 43

Up to two antenna ports per UE are supported for the PyeongChang trial system.

6.2.2.2 Resource elements

Each element in the resource grid is called a resource element and is uniquely defined

by the index pair ( )lk, in a slot where 1,...,0 RBsc

ULRB −= NNk and 1,...,0 UL

symb −= Nl are the

indices in the frequency and time domains, respectively. Resource element ( )lk, on

antenna port p

corresponds to the complex value )(

,plka

.

When there is no risk for confusion, or no particular antenna port is specified, the

index p may be dropped.

Quantities )(

,plka

corresponding to resource elements not used for transmission of a

physical channel or a physical signal in a slot shall be set to zero.


TTAI.KO-06.0448 １１

6.2.2.3 Resource blocks

A physical resource block is defined as ULsymbN

consecutive OFDM symbols in the time

domain and RBscN consecutive subcarriers in the frequency domain, where

ULsymbN

and

RBscN are given by <Table 6-4>.

A physical resource block in the uplink thus consists of RBsc

ULsymb NN ×

resource

elements, corresponding to one slot in the time domain and 900 kHz in the frequency

domain.

<Table 6-4> Resource block parameters

Configuration RBscN

ULsymbN

Cyclic prefix 12 7

The relation between the physical resource block number PRBn in the frequency

domain and resource elements ),( lk in a slot is given by

= RB

scPRB N

kn

6.2.2.3.1 Virtual resource block groups of localized type

Virtual resource block groups of localized type are numbered from 0 to 1ULVRBG −N ,

where ULRB

ULVRBG4 NN = . Virtual resource block group of index

ULVRBGn is mapped to a set

of physical resource block pairs given by { }34,24,14,4 ULVRBG

ULVRBG

ULVRBG

ULVRBG +++ nnnn .

6.2.3 Physical uplink shared channel (xPUSCH)

The baseband signal representing the physical uplink shared channel is defined in

terms of the following steps:

- scrambling

- modulation of scrambled bits to generate complex-valued symbols

- mapping of the complex-valued modulation symbols onto one or several

transmission layers

- precoding of the complex-valued symbols

- mapping of precoded complex-valued symbols to resource elements


TTAI.KO-06.0448 １２

- generation of complex-valued time-domain OFDM signal for each antenna port

- analog beamforming based on the selected beam

Scrambling Modulation mapper

Layermapper Precoding

Resource element mapper

OFDM signal generation

Resource element mapper

OFDM signal generationScrambling Modulation

mapper

layers antenna portscodewords

Analogue beamforming

Analogue beamforming

<Figure 6-3> Overview of uplink physical channel processing

6.2.3.1 Scrambling

For a codeword q, the block of bits )1(),...,0( )(

bit)()( −qqq Mbb , where

)(bitqM is the number

of bits transmitted in codeword q

on the physical uplink shared channel in one

subframe, shall be scrambled with a UE-specific scrambling sequence prior to

modulation, resulting in a block of scrambled bits )1(

~),...,0(

~ (q)bit

)()( −Mbb qq according to the

following pseudo code

Set i = 0

while )(

bitqMi <

if x)()( =ib q // ACK/NACK or Rank Indication placeholder bits

1)(~ )( =ib q

else

if y)()( =ib q // ACK/NACK or Rank Indication repetition placeholder bits

)1(~

)(~ )()( −= ibib qq

else // Data or channel quality coded bits, Rank Indication

coded bits or ACK/NACK coded bits

( ) 2mod)()()(~ )()()( icibib qqq +=

end if

end if

i = i + 1

end while


TTAI.KO-06.0448 １３

The scrambling sequence generator shall be initialised with

cellID

9s

1314RNTIinit 2222 Nnqnc +⋅+⋅+⋅= at the start of each subframe.

Only one codewords can be transmitted in one subframe, i.e., 0=q .

6.2.3.2 Modulation

For an codewordq, the block of scrambled bits

)1(~

),...,0(~ (q)

bit)()( −Mbb qq

shall be modulated

as described in clause 6.4.1, resulting in a block of complex-valued symbols

)1(),...,0( )(symb

)()( −qqq Mdd. <Table 6-5> specifies the modulation mappings applicable for the

physical uplink shared channel.

<Table 6-5> Uplink modulation schemes

Physical channel Modulation schemes

PUSCH QPSK, 16QAM, 64QAM

6.2.3.2.1 Layer mapping

The complex-valued modulation symbols for the codeword to be transmitted are

mapped onto one or two layers. Complex-valued modulation symbols

)1(),...,0( )(symb

)()( −qqq Mdd for codeword

q shall be mapped onto the layers

[ ]Tixixix )(...)()( )1()0( −= υ,

1,...,1,0 layersymb −= Mi

where υ is the number of layers and layersymbM

is

the number of modulation symbols per layer.

6.2.3.2.1.1 Layer mapping for transmission on a single antenna port

For transmission on a single antenna port, a single layer is used, 1=υ , and the

mapping is defined by

)()( )0()0( idix =

with (0)symb

layersymb MM =

.


TTAI.KO-06.0448 １４

6.2.3.2.1.2 Layer mapping for spatial multiplexing

For spatial multiplexing, the layer mapping shall be done according to <Table 6-6>.

The number of layers υ is one or two.

<Table 6-6> Codeword-to-layer mapping for spatial multiplexing

Number of layers Number of codewords Codeword-to-layer mapping


1 1 )()( )0()0( idix = )0(

symblayersymb MM =

2 1 )12()(

)2()()0()1(

)0()0(

+==

idixidix

2)0(

symblayersymb MM =

6.2.3.2.1.3 Layer mapping for transmit diversity

For transmit diversity, the layer mapping shall be done according to <Table 6-7>.

There is only one codeword and the number of layers υ is two.

<Table 6-7> Codeword-to-layer mapping for transmit diversity



2 1 )12()(

)2()()0()1(

)0()0(

+=

=

idix

idix

2)0(symb

layersymb MM =

6.2.3.3.1 Precoding

The precoder takes as input a block of vectors (0) ( 1)( ) ... ( )

Tx i x iυ− ,


from the layer mapping and generates a block of vectors [ ]TP iziz )()( )1()0( − ,

1,...,1,0 apsymb −= Mi

to be mapped onto resource elements.

6.2.3.3.1.1 Precoding for transmission on a single antenna port

For transmission on a single antenna port, p

, indicated in the uplink resource

allocation, DCI format A1, precoding is defined by


TTAI.KO-06.0448 １５

( ) (0)( ) ( )pz i x i=

where, 1,...,1,0 ap

symb −= Mi,

layersymb

apsymb MM =

.

6.2.3.3.1.2 Precoding for transmit diversity

Precoding for transmit diversity is only used in combination with layer mapping for

transmit diversity as described in clause 5.3.2.1.3. The precoding operation for

transmit diversity is defined for two antenna ports.

For transmission on two antenna ports, 1p and 2p , indicated in the uplink resource

allocation, DCI format A1 , the output [ ]Tpp iziziz )()()( )()( 21= ,

1,...,1,0 apsymb −= Mi

of the

precoding operation is defined by

( )( )( )( )

−

−=

++

)(Im)(Im)(Re)(Re

001010010

001

21

)12()12(

)2()2(

)1(

)0(

)1(

)0(

)(

)(

)(

)(

2

1

2

1

ixixixix

jjj

j

iziz

iziz

p

p

p

p

for1,...,1,0 layer

symb −= Mi with

layersymb

apsymb 2MM =

.

PrecodingW

v layers

DM-RS 0DM-RS 1

P antenna ports

(Figure6-4) DM-RS location for transmit diversity

For transmit diversity, DM-RS is located after precoding with 2P = antenna ports as


6.2.3.3.1.3 Precoding for spatial multiplexing

Precoding for spatial multiplexing is only used in combination with layer mapping for

spatial multiplexing as described in clause 5.3.2A.2. Spatial multiplexing supports


TTAI.KO-06.0448 １６

2=P antenna ports where the set of antenna ports used for spatial multiplexing are

1p and 2p , indicated in the uplink resource allocation, DCI format A1.

Precoding for spatial multiplexing is defined by

=

− )(

)(

)()(

)1(

)0(

)(

)(

2

1

iy

iyW

iziz

p

p

υ

where 1,...,1,0 ap

symb −= Mi,

layersymb

apsymb MM =

.

For transmission on two antenna ports, 1p and 2p the precoding matrix )(iW shall be

generated according to from <Table 6-8>.

<Table 6-8> Codebook for transmission on antenna ports { 1p , 2p }

Codebook

index

Number of layers υ

1 2

0

11

21

1001

21

1

−11

21

−1111

21

2

j1

21

3

− j1

21

-

4

01

21

5

10

21

PrecodingW

DM-RS 0DM-RS 1

v layers P antenna ports

(Figure 6-5) DM-RS location for spatial multiplexing using antenna ports with UE-specific

reference signals


TTAI.KO-06.0448 １７

For spatial multiplexing using antenna ports with UE-specific reference signals, DM-

RS is located before precoding with υ layers as illustrated in (Figure 6-5).

6.2.3.4 Mapping to physical resources

For each antenna port p used for transmission of the xPUSCH in a subframe the

block of complex-valued symbols )1(),...,0( ap

symb)~()~( −Mzz pp

shall be multiplied with the

amplitude scaling factor xPUSCHβ in order to conform to the transmit power xPUSCHP

,

and mapped in sequence starting with )0()~( pz to physical resource blocks on antenna

port p and assigned for transmission of xPUSCH. The mapping to resource elements

( )lk, corresponding to the physical resource blocks assigned for transmission and

- not used for transmission of phase noise compensation reference signal, and-

not part of OFDM symbol(s) including DM-RS in a subframe, and

- not part of the first two OFDM symbols in a subframe, and

- not part of the last OFDM symbol(s) in a subframe if indicated in the scheduling

DCI

shall be in increasing order of first the index k , then the index l , starting with the first

slot in the subframe.

6.2.4 Physical uplink control channel (xPUCCH)

The physical uplink control channel, xPUCCH, carries uplink control information. The

xPUCCH can be transmitted in the last symbol of a subframe.

xPUCCH uses a cyclic shift, )( scellcs nn , which varies with the slot number sn according to

∑=⋅+⋅=

7

0ULsymbs

cellcs 2)8()(

ii

s inNcnn

20modss nn =

where the pseudo-random sequence )(ic is defined by section 7.2. The pseudo-

random sequence generator shall be initialized with RSIDinit nc = where

RSIDn is given by

Section 5.5.1.5.

The physical uplink control channel supports single format as shown in <Table 6-9>.


TTAI.KO-06.0448 １８

<Table 6-9>Supported xPUCCH formats

xPUCCH format Modulation scheme Number of bits per subframe, bitM

2 QPSK 96

6.2.4.1 xPUCCH formats 2

The block of bits bit(0),..., ( 1)b b M − shall be scrambled with a UE-specific scrambling

sequence, resulting in a block of scrambled bits bit(0),..., ( 1)b b M − according to

( )( ) ( ) ( ) mod 2b i b i c i= +

where the scrambling sequence )(ic is given by clause 7.2. The scrambling sequence

generator shall be initialized with

( ) ( )cell 16init ID RNTI2 1 2 1 2sc n N n= + ⋅ + ⋅ +

mod 20s sn n=

at the start of each subframe where RNTIn is the C-RNTI.

The block of scrambled bits bit(0),..., ( 1)b b M − shall be QPSK modulated as described

in sub-clause 7.1, resulting in a block of complex-valued modulation symbols

symb(0),..., ( 1)d d M − where symb bit 2M M= .

6.2.4.1.1 Layer mapping

The complex-valued modulation symbols to be transmitted are mapped onto one or

two layers. Complex-valued modulation symbols )1(),...,0( symb −Mdd shall be mapped

on to the layers [ ]Tixixix )(...)()( )1()0( −= υ

, 1,...,1,0 layer

symb −= Mi where υ is the number of

layers and layersymbM

is the number of modulation symbols per layer.



)()()0( idix =

with (0)symb

layersymb MM =

.

For transmission on two antenna ports, and the mapping rule of 2=υ can be defined


TTAI.KO-06.0448 １９

by

)12()()2()(

)1(

)0(

+=

=

idixidix

with 2/(0)

symblayersymb MM =

.

6.2.4.1.2 Precoding

The precoder takes as input a block of vectors (0) ( 1)( ) ... ( )

Tx i x iυ− ,


from the layer mapping and generates a block of vectors [ ]TP iyiy )()( )1()0( − ,

1,...,1,0 apsymb −= Mi

to be mapped onto resource elements.

For transmission on a single antenna port, precoding is defined by

)()( )0()0( ixiy =

where 1,...,1,0 ap

symb −= Mi and

layersymb

apsymb MM =

.

For transmission on two antenna ports, { }1,0~∈p , the output [ ]Tiyiyiy )()()( )1()0(= ,

1,...,1,0 apsymb −= Mi

of the precoding operation is defined by

( )( )( )( )

−

−=

++

)(Im)(Im)(Re)(Re

001010010

001

21

)12()12(

)2()2(

)1(

)0(

)1(

)0(

)1(

)0(

)1(

)0(

ixixixix

jjj

j

iyiy

iyiy

for 1,...,1,0 layer

symb −= Mi with

layersymb

apsymb 2MM =

.

The mapping to resource elements is defined by operations on quadruplets of

complex-valued symbols. Let ( ) ( ) ( ) ( ) ( )( ) (4 ), (4 1), (4 2), (4 3)p p p p pw i y i y i y i y i= + + +

denote

symbol quadruplet i for antenna port p , where quad0,1,..., 1i M= − and

4symbquad MM =

The block of quadruplets ( ) ( )

quad(0),..., ( 1)p pw w M −

shall be cyclically shifted, resulting in

( ) ( )quad(0),..., ( 1)p pw w M −

where( ) ( )( ) ( ) cell

cs s quad( ( )) modp pw i w i n n M= +

. Let

( ) ( ) ( ) ( ) ( )( ) (4 ), (4 1), (4 2), (4 3)p p p p pw i y i y i y i y i= + + +

denote another symbol quadruplet i for

antenna port p obtained after cell-specific cyclic shift.

The block of complex-valued symbols w shall be mapped to z according to


TTAI.KO-06.0448 ２０

( ) ( )( ) (2) RB RB RB ( )xPUCCH xPUCCH sc sc' ' 8 'p pz n N N m N k y m k⋅ ⋅ + ⋅ + = +

where

RBxPUCCH

0 1' 2 2 5

4 6 7' 0,1,2, ,5

6

k kk k k

k kmN

≤ ≤= + ≤ ≤ + ≤ ≤

==

and (2)xPUCCHn

is indicated in the xPDCCH.

6.2.5 Reference signals

Four types of uplink reference signals are supported:

- Demodulation reference signal, associated with transmission of xPUCCH

- Demodulation reference signal, associated with transmission of xPUSCH

- Phase noise compensation reference signal, associated with transmission of

xPUSCH (PCRS)

- Sounding reference signal, not associated with transmission of xPUSCH or

xPUCCH

6.2.5.1 Generation of the reference signal sequence

Reference signal sequence )()(

, nr vuα

is defined by a cyclic shift α of a base sequence

)(, nr vu according to

RSsc,

)(, 0),()( Mnnrenr vu

njvu <≤= αα

where RBsc

RSsc mNM = is the length of the reference signal sequence and

max, ULRB1 m N≤ ≤ .

Multiple reference signal sequences are defined from a single base sequence through

different values of α .

Base sequences )(, nr vu are divided into groups, where { }29,...,1,0∈u is the group

number and v is the base sequence number within the group, such that each group

contains one base sequence ( 0v = ) of each length RBsc

RSsc mNM = , 52 ≤≤ m and two

base sequences ( 1,0=v ) of each length RBsc

RSsc mNM = ,

max,ULRB6 m N≤ ≤ . The sequence


TTAI.KO-06.0448 ２１

group number u and the number v within the group may vary in time as described

in clauses 5.5.1.3 and 5.5.1.4, respectively. The definition of the base sequence

RS, , sc(0),..., ( 1)u v u vr r M −

depends on the sequence lengthRSscM .

6.2.5.1.1 Base sequences of length larger than RBsc3N

ForRBsc

RSsc 3NM ≥ , the base sequence

)1(),...,0( RSsc,, −Mrr vuvu is given by

RSsc

RSZC, 0),mod()( MnNnxnr qvu <≤=

where the thq root Zadoff-Chu sequence is defined by

( ) 10, RSZC

)1(RSZC −≤≤=+

−

Nmemx Nmqmj

q

π

with q given by

31)1(

)1(21RSZC

2

+⋅=

−⋅++=

uNq

vqq q

The length RSZCN of the Zadoff-Chu sequence is given by the largest prime number

such thatRSsc

RSZC MN < .

6.2.5.1.2 Base sequences of length less than RBsc3N

For RBsc

RSsc 2NM = , base sequence is given by

10,)( RSsc

4)(, −≤≤= Mnenr njvu

πϕ

where the value of )(nϕ is given by <Table 6-10> for RBsc

RSsc 2NM = , respectively.


TTAI.KO-06.0448 ２２

<Table 6-10> Definition of )(nϕ for RBsc

RSsc 2NM =

u )23(),...,0( ϕϕ

0 -1 3 1 -3 3 -1 1 3 -3 3 1 3 -3 3 1 1 -1 1 3 -3 3 -3 -1 -3

1 -3 3 -3 -3 -3 1 -3 -3 3 -1 1 1 1 3 1 -1 3 -3 -3 1 3 1 1 -3

2 3 -1 3 3 1 1 -3 3 3 3 3 1 -1 3 -1 1 1 -1 -3 -1 -1 1 3 3

3 -1 -3 1 1 3 -3 1 1 -3 -1 -1 1 3 1 3 1 -1 3 1 1 -3 -1 -3 -1

4 -1 -1 -1 -3 -3 -1 1 1 3 3 -1 3 -1 1 -1 -3 1 -1 -3 -3 1 -3 -1 -1

5 -3 1 1 3 -1 1 3 1 -3 1 -3 1 1 -1 -1 3 -1 -3 3 -3 -3 -3 1 1

6 1 1 -1 -1 3 -3 -3 3 -3 1 -1 -1 1 -1 1 1 -1 -3 -1 1 -1 3 -1 -3

7 -3 3 3 -1 -1 -3 -1 3 1 3 1 3 1 1 -1 3 1 -1 1 3 -3 -1 -1 1

8 -3 1 3 -3 1 -1 -3 3 -3 3 -1 -1 -1 -1 1 -3 -3 -3 1 -3 -3 -3 1 -3

9 1 1 -3 3 3 -1 -3 -1 3 -3 3 3 3 -1 1 1 -3 1 -1 1 1 -3 1 1

10 -1 1 -3 -3 3 -1 3 -1 -1 -3 -3 -3 -1 -3 -3 1 -1 1 3 3 -1 1 -1 3

11 1 3 3 -3 -3 1 3 1 -1 -3 -3 -3 3 3 -3 3 3 -1 -3 3 -1 1 -3 1

12 1 3 3 1 1 1 -1 -1 1 -3 3 -1 1 1 -3 3 3 -1 -3 3 -3 -1 -3 -1

13 3 -1 -1 -1 -1 -3 -1 3 3 1 -1 1 3 3 3 -1 1 1 -3 1 3 -1 -3 3

14 -3 -3 3 1 3 1 -3 3 1 3 1 1 3 3 -1 -1 -3 1 -3 -1 3 1 1 3

15 -1 -1 1 -3 1 3 -3 1 -1 -3 -1 3 1 3 1 -1 -3 -3 -1 -1 -3 -3 -3 -1

16 -1 -3 3 -1 -1 -1 -1 1 1 -3 3 1 3 3 1 -1 1 -3 1 -3 1 1 -3 -1

17 1 3 -1 3 3 -1 -3 1 -1 -3 3 3 3 -1 1 1 3 -1 -3 -1 3 -1 -1 -1

18 1 1 1 1 1 -1 3 -1 -3 1 1 3 -3 1 -3 -1 1 1 -3 -3 3 1 1 -3

19 1 3 3 1 -1 -3 3 -1 3 3 3 -3 1 -1 1 -1 -3 -1 1 3 -1 3 -3 -3

20 -1 -3 3 -3 -3 -3 -1 -1 -3 -1 -3 3 1 3 -3 -1 3 -1 1 -1 3 -3 1 -1

21 -3 -3 1 1 -1 1 -1 1 -1 3 1 -3 -1 1 -1 1 -1 -1 3 3 -3 -1 1 -3

22 -3 -1 -3 3 1 -1 -3 -1 -3 -3 3 -3 3 -3 -1 1 3 1 -3 1 3 3 -1 -3

23 -1 -1 -1 -1 3 3 3 1 3 3 -3 1 3 -1 3 -1 3 3 -3 3 1 -1 3 3

24 1 -1 3 3 -1 -3 3 -3 -1 -1 3 -1 3 -1 -1 1 1 1 1 -1 -1 -3 -1 3

25 1 -1 1 -1 3 -1 3 1 1 -1 -1 -3 1 1 -3 1 3 -3 1 1 -3 -3 -1 -1

26 -3 -1 1 3 1 1 -3 -1 -1 -3 3 -3 3 1 -3 3 -3 1 -1 1 -3 1 1 1

27 -1 -3 3 3 1 1 3 -1 -3 -1 -1 -1 3 1 -3 -3 -1 3 -3 -1 -3 -1 -3 -1

28 -1 -3 -1 -1 1 -3 -1 -1 1 -1 -3 1 1 -3 1 -3 -3 3 1 1 -1 3 -1 -1

29 1 1 -1 -1 -3 -1 3 -1 3 -1 1 3 1 -1 3 1 3 -3 -3 1 -1 -1 1 3


TTAI.KO-06.0448 ２３

6.2.5.1.3 Group hopping

The sequence-group number u in slot sn is defined by a group hopping pattern

)( sgh nf and a sequence-shift pattern ssf according to

( ) 30mod)( sssgh fnfu +=

There are 17 different hopping patterns and 30 different sequence-shift patterns.

Sequence-group hopping can be enabled or disabled by means of the cell-specific

parameter Group-hopping-enabled provided by higher layers.

The group-hopping pattern )( sgh nf for SRS is given by

( )

⋅+= ∑ =

enabled is hopping group if30mod2)8(disabled is hopping group if0

)( 7

0sgh

ii

s incnf

20modss nn =

where the pseudo-random sequence )(ic is defined by clause 7.2. The pseudo-

random sequence generator shall be initialized with

=

30

RSID

initnc

at the beginning of

each radio frame where RSIDn is given by clause 5.5.1.5.

The sequence-shift pattern ssf definition differs between xPUCCH and SRS.

For xPUCCH, the sequence-shift pattern PUCCH

ssf is given by 30modRSID

PUCCHss nf = where

RSIDn is given by clause 5.5.1.5.

For SRS, the sequence-shift pattern SRS

ssf is given by 30modRSID

SRSss nf = where

RSIDn is

given by clause 5.5.1.5.

6.2.5.1.4 Sequence hopping

Sequence hopping only applies for reference-signals of length RBsc

RSsc 6NM ≥ .

For reference-signals of length RBsc

RSsc 6NM < , the base sequence number v within the

base sequence group is given by 0=v .

For reference-signals of length RBsc

RSsc 6NM ≥ , the base sequence number v within the

base sequence group in slot sn is defined by


TTAI.KO-06.0448 ２４

=otherwise0

enabled is hopping sequence and disabled is hopping group if)20mod( sncv

where the pseudo-random sequence )(ic is given by clause 7.2. The parameter

Sequence-hopping-enabled provided by higher layers determines if sequence

hopping is enabled or not.

For SRS, the pseudo-random sequence generator shall be initialized with

( ) 30mod230 ss

RSID

5RSID

init ∆++⋅

= nnc

at the beginning of each radio frame where RSIDn is

given by clause 5.5.1.5 and ss∆ is given by clause 5.5.1.3.

6.2.5.1.5 Determining virtual cell identity for sequence generation

The definition of RSIDn depends on the type of transmission.

Transmissions associated with xPUCCH:

- cellID

RSID Nn = if no value for

xPUCCHIDn is configured by higher layers,

- PUCCHID

RSID nn = otherwise.

Sounding reference signals:

- RS cellID IDn N= if no value for

xSRSIDn

is configured by higher layers, xSRSID

RSID nn =

otherwise.

6.2.5.2 Demodulation reference signals associated with xPUCCH

Demodulation reference signals associated with xPUCCH are transmitted on single

antenna port 100=p or two antenna ports 201,200 == pp .

6.2.5.2.1 Sequence generation

For any of the antenna ports { }201,200,100∈p the reference signal sequence )(

s, mr nl

is defined by

( ) ( ) 14,...,1,0 ,)12(212

1)2(212

1)( ULRB, s

−⋅=+⋅−+⋅−= Nmmcjmcmr nl

where sn is the slot number within a radio frame and l is the OFDM symbol number


TTAI.KO-06.0448 ２５

within the slot. The pseudo-random sequence )(ic is defined in clause 7.2. The

pseudo-random sequence generator shall be initialised with

( ) ( ) RNTI16)(

IDinit 21212/ SCID nnnc ns +⋅+⋅+=

20modss nn =

at the start of each subframe where RNTIn is the C-RNTI.

The quantities )(

IDin , 1,0=i , are given by

- cellID

)(ID Nn i = if no value for

in xPUCCH,ID is provided by higher layers.

- ii nn xPUCCH,

ID)(

ID = otherwise

The value of SCIDnis zero unless specified otherwise. For an xPUCCH transmission,

SCIDn is given by the DCI formats in associated with the xPUCCH transmission.

6.2.5.2.2 Mapping to resource elements

In a physical resource block with frequency-domain index BPRn assigned for the

corresponding xPUCCH transmission, a part of the reference signal sequence )(mr

shall be mapped to complex-valued modulation symbols )(

,plka

in a subframe

according to

)4()2mod( PRB,)(

, smnrmwa nlp

plk +⋅⋅=

where

12mod3,2,1,0

326102

'

6

12mod)1(02mod)(

)(

PRBRBsc

PRB

PRB

==

≤≤+≤≤+

=

=

′+⋅=

=−=

=

s

p

pp

nm

mmmm

m

lmnNk

niwniw

iw

and the sequence )(iwp is given by <Table 6-11>.


TTAI.KO-06.0448 ２６

<Table 6-11> The sequence )(iwp

Antenna port p

[ ])1()0( pp ww

100 or 200 [ ]11 ++

201 [ ]11 −+

l = 0 l = 6 l = 0 l = 6

even-numbered slots odd-numbered slotsAntenna port 100

R100

R100

R100

R100

l = 0 l = 6 l = 0 l = 6


R200

R200

R200

R200

l = 0 l = 6 l = 0 l = 6


R201

R201

R201

R201

(Figure 6-6) Mapping of xPUCCH demodulation reference signals

(Figure 6-6) illustrates the resource elements used for xPUCCH demodulation

reference signals according to the above definition. The notation R p is used to

denote a resource elements used for reference signal transmission on antenna port p.

6.2.5.3 Demodulation reference signals associate with xPUSCH

UE specific reference signals associated with xPUSCH


TTAI.KO-06.0448 ２７

- are transmitted on antenna port(s) 43,42,41,40=p ;

- are present and are a valid reference for xPUSCH demodulation only if the

xPUSCH transmission is associated with the corresponding antenna port;

- are transmitted only on the physical resource blocks upon which the

corresponding xPUSCH is mapped.

A UE-specific reference signal associated with xPUSCH is not transmitted in resource

elements ( )lk, in which one of the physical channels are transmitted using resource

elements with the same index pair ( )lk, regardless of their antenna port p.


For any of the antenna ports { }43,42,41,40∈p the reference-signal sequence ( )mr is

defined by

( ) ( )( ) ( )( ) 13,...,1,0,12212

12212

1 max, −=+⋅−+⋅−= DLRBNmmcjmcmr

.

The pseudo-random sequence )(ic is defined in clause 7.2. The pseudo-random

sequence generator shall be initialised with

( ) ( ) SCID16)(

IDsinit 21212/ SCID nnnc n +⋅+⋅+=

at the start of each subframe.

The quantities )(


- cellID


inDMRS,ID is provided by higher layers

- ii nn DMRS,

ID)(

ID = otherwise

The value of SCIDn is zero unless specified otherwise. For a xPUSCH transmission,

SCIDn is given by the DCI format associated with the xPUSCH transmission.


For antenna ports { }43,42,41,40∈p , in a physical resource block with frequency-

domain index BPRn assigned for the corresponding xPUSCH transmission, a part of


TTAI.KO-06.0448 ２８

the reference signal sequence )(mr shall be mapped to complex-valued modulation

symbols )(

,plka

in a subframe according to

( ) ( )'', kra plk =

where

{ }{ }{ }{ }

2,1,0'case speedhigh for slot) odd3(in slot),even (in 2

slot)even (in 24

''

433422411400

'

''4 PRBRBsc

=

=

=

∈∈∈∈

=

+⋅+=

m

l

kk

pppp

k

knNmk

Information indicating whether 2=l or { }10,2=l l=2, 10 is signaled via higher layer

signaling.

Resource elements ( )lk, used for transmission of UE-specific reference signals to

one UE on any of the antenna ports in the set S , where, { }40=S , { }41=S , { }42=S

or { }43=S shall

- not be used for transmission of xPUSCH on any antenna port in the same

subframe, and

- not be used for UE-specific reference signals to the same UE on any antenna

port other than those in S in the same subframe.

(Figure 6-7) illustrates the resource elements used for UE-specific reference signals

for antenna ports 40, 41, 42 and 43.


TTAI.KO-06.0448 ２９

0 1 2 3 4 5 6 7 8 9 10 11 12 1347 4346 4245 4144 4043424140393837363534333231302928272625242322212019181716151413121110

9876543210

(Figure 6-7) Mapping of UE-specific reference signals, antenna ports {40, 41,42,43}

6.2.5.4 Sounding reference signal

Sounding reference signals are transmitted on antenna port(s), { }41,40∈p .


The sounding reference signal sequence ( ) ( )nrnr p

vup )(

,)~(

SRS~α= is defined by clause 5.5.1,

where u is the sequence-group number defined in clause 5.5.1.3 and ν is the

base sequence number defined in clause 5.5.1.4. The cyclic shift p~α of the sounding

reference signal is given as


TTAI.KO-06.0448 ３０

{ }1,...,1,0~

8mod~8

82

ap

ap

csSRS

~csSRS

~csSRS

~

−∈

+=

=

Np

Npnn

n

p,

p,

p πα

,

where { }7,6,5,4,3,2,1,0csSRS ∈n is configured for aperiodic sounding by the higher-layer

parameters cyclicShift-ap for each UE and apN is the number of antenna ports used

for sounding reference signal transmission.

6.2.5.4.2 Mapping to physical resources

The sequence shall be multiplied with the amplitude scaling factor SRSβ in order to

conform to the transmit power SRSP , and mapped in sequence starting with )0()~(SRS

pr to

resource elements ),( lk on antenna port p

according to

−=

=+

otherwise0

1,,1,0')'(1 RS,sc

)~(SRS

ap)(

,'2 0

bp

SRSplkk

MkkrNa

β

where apN is the number of antenna ports used for sounding reference signal

transmission and the relation between the index p~ and the antenna port p is given

by <Table 6-12>. The quantity 0k is the frequency-domain starting position of the

sounding reference signal, SRSBb = and RSsc,bM

is the length of the sounding reference

signal sequence defined as

2RBscSRS,

RSsc, NmM bb =

where bmSRS, is given by <Table 6-12>. The UE-specific parameter srs-Bandwidth,

}3,2,1,0{SRS ∈B is given by higher layers.

The frequency-domain starting position 0k is defined by

RBscbTC Nnkk ⋅+=0

where }1,0{TC ∈k is given by the UE-specific parameter transmissionComb-ap,

provided by higher layers for the UE, and bn is frequency position index.

The frequency position index bn remains constant (unless re-configured) and is


TTAI.KO-06.0448 ３１

defined by RRCnn 4b = where the parameter RRCn is given by higher-layer parameters

freqDomainPosition-ap,

SRS can be transmitted simultaneously in multiple component carriers.

<Table 6-12> bmSRS, , 3,2,1,0=b , values for the uplink bandwidth of 100ULRB =N

SRS

bandwidth

configuration

SRSC

SRS-

Bandwidth 0SRS =B

SRS-

Bandwidth 1SRS =B

SRS-

Bandwidth 2SRS =B

SRS-

Bandwidth 3SRS =B

0SRS,m 1SRS,m

2SRS,m 3SRS,m

0 100 48 24 4

6.2.5.4.3 Sounding reference signal subframe configuration

The sounding reference signal is always aperiodic and explicitly scheduled via PDCCH.

The subframe number and symbol number (last symbol or the second last symbol) of

SRS are conveyed in DCI.

6.2.5.5 Phase noise compensation reference signal, associated with transmission of

PUSCH

Phase noise compensation reference signal associated with xPUSCH

- are transmitted on one antenna port assigned to UE;


corresponding xPUSCH is mapped.


For any of the antenna ports { }43,42,41,40∈p , the reference-signal sequence ( )mr is

defined by

( ) ( )( ) ( )( ) 12,...,1,0,12212

12212

1−=+⋅−+⋅−= UL

symbNmmcjmcmr.



TTAI.KO-06.0448 ３２


( ) ( ) SCID16)(


20modss nn =


The quantities )(


- cellID



- ii nn DMRS,

ID)(

ID = otherwise

The value of SCIDn is zero unless specified otherwise. For a xPUSCH transmission,

SCIDn is given by the DCI format in associated with the xPUSCH transmission.


For antenna ports { }43,42,41,40∈p , in a physical resource block with frequency-

domain index 'BPRn assigned for the corresponding xPUSCH transmission, a part of

the reference signal sequence )(mr shall be mapped to complex-valued modulation

symbols )(

,plka


( ) ( )', lra plk =

where 'l is the symbol index within a subframe, the starting resource block number of

xPUSCH physical resource allocation xPUSCHPRBn in the frequency domain, resource

allocation bandwidth in terms of number of resource blocks xPUSCHPRBN and resource

elements )',( lk in a subframe is given by

===

=

∈∈∈∈

=

+

+=

87ionconfiguratSubframeif,11,...,365ionconfiguratSubframeif,12,...,3

4ionconfiguratSubframeif,13,...,3

4323422241214020

42

'

'RBsc

ororl

pppp

k

kNnNkxPUSCHPRBxPUSCH

PRB


TTAI.KO-06.0448 ３３

Resource elements ( )lk, used for transmission of UE-specific phase noise

compensation reference signals from one UE on an antenna port Sp∈ , where

{ }40=S , { }41=S , { }42=S or { }43=S shall

- not be used for transmission of xPUSCH on any antenna port in the same

subframe.

(Figure 6-8) illustrates the resource elements used for phase noise compensation

reference signals for antenna ports 40, 41, 42 and 43.

4PRB

xPUSCHPRBn

xPUSCHPRBN

1 subframe

xPDCCHSymbol

DMRSSymbol

UL control SymbolGP

0 1 2 3 4 5 6 7 8 9 10 11 12 1347 4346 4245 4144 4043424140393837363534333231302928272625242322212019181716151413121110

9876543210

(Figure 6-8) Mapping of phase noise compensation reference signals, antenna ports

50, 51, 52 and 53


TTAI.KO-06.0448 ３４

6.2.6 OFDM baseband signal generation

This clause applies to all uplink physical signals and uplink physical channels.

The time-continuous signal ( )ts pl

)( on antenna port

p in OFDM symbol l in an uplink

slot is defined by

( ) ( )

( ) ∑∑=

−∆−

−=

−∆ ⋅+⋅= +−

2/

1

2)(,

1

2/

2)(,

)(RBsc

ULRB

s,CP)(

RBsc

ULRB

s,CP)(

NN

k

TNtfkjplk

NNk

TNtfkjplk

pl

ll eaeats ππ

for ( ) s,CP0 TNNt l ×+<≤ where 2RB

scULRB

)( NNkk +=− and 12RB

scULRB

)( −+=+ NNkk . The

variable N equals 2048 and kHz 75=∆f .

The OFDM symbols in a slot shall be transmitted in increasing order of l , starting with

0=l , where OFDM symbol 0>l starts at time ∑−

=′ ′ +1

0 s,CP )(l

l l TNN within the slot.

<Table 6-13> lists the value of lN ,CP that shall be used.

<Table 6-13> OFDM parameters

Configuration Cyclic prefix length lN ,CP

Normal cyclic prefix kHz 75=∆f 0for 160 =l

6,...,2,1for 144 =l

6.2.7 Physical random access channel (xPRACH)

6.2.7.1 Random access preamble subframe

The physical layer random access preamble symbol, illustrated in (Figure 6-9) consists

of a cyclic prefix of length TCP and a sequence part of length TSEQ.

(Figure 6-9) Random access preamble


TTAI.KO-06.0448 ３５

(Figure 6-10) denotes how the BS receives RACH from multiple UEs. These UEs

occupy the same set of subcarriers. Each UE transmits for two symbols. UE1, UE3,

…UE9, etc. are located close to the BS and they transmit for ten symbols in total. UE2,

UE4, …, UE10, etc. are located at cell edge. These UEs also transmit in the same ten

symbols. Due to the difference in distance, the signals of these UEs arrive at the BS

TRTT time later than those of UE1, UE3, …, UE5.

(Figure 6-10) Reception of RACH signal at BS during RACH subframe

The parameter values are listed in <Table 6-14>.

<Table 6-14> Random access preamble parameters

Preamble

format

TGP1

TCP TSEQ

NSYM

TGP2

0 2224*Ts 656*Ts 2048*Ts 10 1456*Ts

1 2224*Ts 1344*Ts 2048*Ts 8 1360*Ts

Due to extended cyclic prefix, there are ten symbols in this sub-frame for preamble

format 0, and eigth symbols for preamble format 1 meant for 1km distance.

Different subframe configurations for RACH are given below:

<Table 6-15>Random access configuration

PRACH

configuration

System Frame

Number

Subframe

Number

0 Any 15, 40

1 Any 15


TTAI.KO-06.0448 ３６

RACH signal is transmitted by a single antenna port 1000. The antenna port for RACH

signal should have the same directivity as the one during which the measurement of

the best BRS beam was conducted.

6.2.7.2 Preamble sequence generation

The random access preambles are generated from Zadoff-Chu sequences with a

length of 71. The thu root Zadoff-Chu sequence is defined by

( ) 10, ZC

)1(ZC −≤≤=+

−Nnenx N

nunj

u

π

where the length ZCN of the Zadoff-Chu sequence is 71. The value of the root is

provided by higher layers.

The random access preamble shall be mapped to resource elements according

to

23

,

RACH RACH

( ) ,

{0,1,2} for format 0{0} for format 1

k n 1 12* (6 * n 1), n {0,1...7}1 if is even

' if is odd' { 1,1}

n 0,1...,70, {(0,1),(2,3),(

j vk

k l ua f x n e

lf

f lf

l

π

ν

−= ⋅

∈

= + + + ∈

=

∈ −=

∈4,5),(6,7),(8,9)} for format 0

{(0,1),(2,3),(4,5),(6,7)} for format 1

where the cyclic shift , RACH band index nRACH and parameter f’ are provided by

higher layers. As outlined by the equations above, the RACH subframe provides 8

RACH bands each occupying 6RBs. The parameter determines which band is

used by the UE.

During the synchroniation subframe, the UE identifies the symbol with the strongest

beam. A set of parameters provided by the upper layers is used to map the symbol

with the strongest beam to the RACH symbol index , as described in 5.7.2.1.

Higher layers determine the component carrier, in which the UE transmits the RACH

signal.

There are 48 preambles available in each cell. The set of 48 or 16 preambles


TTAI.KO-06.0448 ３７

according to preamble format in a cell is found by combination of cyclic shift, OCC,

and band index. Preamble index is allocated as follows:

( )'Preamble index = 1 / 2 2

: number of cyclic shift=3, for format 0

=1, for format 1

v v RACH

v

v

v

v N f N n

whereNNN

+ ⋅ + + ⋅ ⋅

6.2.7.2.1 Procedure to Compute the Symbols of RACH Signal

Layer 1 receives the following parameters, from higher layers:

- System Frame Number, SFN

- the BRS transmission period as defined in clause 6.7.4.3 expressed in units of

symbols

- the number of symbols during the RACH subframe for which the BS applies

different rx –beams, where

5, if preamble format = 04, if preamble format = 1

RACH

RACH

NN

= =

- number of RACH subframes M in each radio frame (here M can be 1 or 2

depending on RACH configuration)

- index of RACH subframe m (here m ranges between 0 to M-1)

- the symbol with the strongest sync beam,

BestBeamSyncS

(here the value of

BestBeamSyncS

ranges between 0 and ).

The RACH subframes use the same beams as the synchronization subframes and in

the same sequential order. Hence if the m-th RACH subframe occurs within a radio

frame with the system frame number SFN, it will use the beams of the synchronization

symbols identified by the set

If

BestBeamSyncS

is among those symbols, the UE shall transmit the RACH preamble during

the RACH subframe.

The transmission should start at symbol


TTAI.KO-06.0448 ３８

where denotes the number of symbols dedicated to a single RACH transmission.

Here

6.2.7.3 Baseband Signal Generation

The baseband signal for RACH is generated in an OFDM manner according to section

5.6 with a tone spacing of and a cyclic prefix length of 656 or 1344

samples are inserted corresponding to the preamble format provided by higher layer.

6.2.7.4 Scheduling Request Collection during RACH Periods

6.2.7.4.1 Scheduling request preamble slot

Symbols for scheduling request (SR) are transmitted during the RACH subframe. They

occupy a different set of subcarriers than those of RACH signal. Scheduling request is

collected from any UE in a similar manner as the RACH signal. The scheduling request

preamble, illustrated in (Figure 6-11)consists of a cyclic prefix of length TCP and a

sequence part of length TSEQ. Both have the same values as their counterparts of the

RACH preamble.

(Figure 6-11) SR preamble

<Table 6-16> Scheduling request preamble parameters

Preamble

configuration CPT SEQT

0 656 Ts 2048 Ts

1 1344 Ts 2048 Ts


TTAI.KO-06.0448 ３９

6.2.7.4.2 Preamble sequence generation

The scheduling request preambles are generated from Zadoff-Chu sequences. The

network configures the set of preamble sequences the UE is allowed to use.

The length of scheduling request preamble sequence is 71. The thu root Zadoff-Chu

sequence is defined by

( ) 10, ZC

)1(ZC −≤≤=+

−Nnenx N

nunj

u

π

,

where .71ZC =N Twelve different cyclic shifts of this sequence are defined to obtain

scheduling request preamble sequence.

The random access preamble shall be mapped to resource elements according

to

∈

−∈

=

=+++=

∈⋅=−

1format for (6,7)}(4,5),(2,3),{(0,1),0format for (8,9)}(6,7),(4,5),(2,3),{(0,1),

l

}.1,1{'odd is l if '

even is l if 10,1,...,70

),51*(6*12111}0,1,2,....{ ,)( 12

2

,

ff

f

nNnk

enxfa

SR

vkj

ulk νπ

As outlined by the equations above, the RACH subframe provides multiple subbands,

each occupying 6 RBs, for transmitting SR; The parameter NSR determines which band

is used by the UE. The values of and NSR are provided from higher layers. The

symbol index l is calculated in the same way as described in 5.7.2.1

6.2.7.4.3 Baseband signal generation

The baseband signal for SR is generated in the same manner as RACH as outlined in

5.7.3.


TTAI.KO-06.0448 ４０

6.2.8 Modulation and upconversion

Modulation and upconversion to the carrier frequency of the complex-valued OFDM

baseband signal for each antenna port or the complex-valued xPRACH baseband

signal is shown in (Figure 6-12).

Split

{ })(Re tsl

{ })(Im tsl

( )tf02cos π

( )tf02sin π−

Filtering)(tsl

(Figure 6-12) Uplink modulation

6.3 Downlink

6.3.1 Overview

The smallest time-frequency unit for downlink transmission is denoted a resource

element and is defined in clause 6.2.2.

6.3.1.1 Physical channels

The following downlink physical channels are defined:

- Physical Downlink Shared Channel, xPDSCH

- Physical Broadcast Channel, xPBCH

- Extended physical broadcast channel (ePBCH)

- Physical Downlink Control Channel, xPDCCH

6.3.1.2 Physical signals

A downlink physical signal corresponds to a set of resource elements used by the

physical layer but does not carry information originating from higher layers. The

following downlink physical signals are defined:


TTAI.KO-06.0448 ４１

- Reference signal

- Synchronization signal

6.3.2 Slot structure and physical resource elements

6.3.2.1 Resource grid

The transmitted signal in each slot is described by one or several resource grids of

1200RBsc

DLRB =NN subcarriers and

7DLsymb =N

OFDM symbols.

An antenna port is defined such that the channel over which a symbol on the antenna

port is conveyed can be inferred from the channel over which another symbol on the

same antenna port is conveyed.

For beam sweeping transmission per an OFDM symbol, i.e. SS/xPBCH/BRS, an

antenna port is defined within an OFDM symbol. For beam sweeping transmission per

two consecutive OFDM symbols, i.e. ePBCH, an antenna port is defined within two

OFDM symbols. For the other transmission, an antenna port is defined within a

subframe. There is one resource grid per antenna port.

6.3.2.2 Resource elements

Each element in the resource grid for antenna port p is called a resource element and

is uniquely identified by the index pair ( )lk, in a slot where 1,...,0 RBsc

DLRB −= NNk and

1,...,0 DLsymb −= Nl

are the indices in the frequency and time domains, respectively.

Resource element ( )lk, on antenna port p

corresponds to the complex value)(

,plka

.

When there is no risk for confusion, or no particular antenna port is specified, the

index p may be dropped.


TTAI.KO-06.0448 ４２

DLsymbN OFDM symbols

One downlink slot slotT

0=l 1DLsymb −= Nl

RB

scD

LR

BN

N×

subc

arrie

rs

RB

scN

subc

arrie

rs

RBsc

DLsymb NN ×

Resource block resource

elements

Resource element

),( lk

0=k

1RBsc

DLRB −= NNk

(Figure 6-13) Downlink resource grid

6.3.2.3 Resource blocks

Resource blocks are used to describe the mapping of certain physical channels to

resource elements.

A physical resource block is defined as DLsymbN

consecutive OFDM symbols in the time

domain and RBscN consecutive subcarriers in the frequency domain, where

DLsymbN

and

RBscN are given by <Table 6-17>. A physical resource block thus consists of

RBsc

DLsymb NN ×

resource elements, corresponding to one slot in the time domain and

900 kHz in the frequency domain.


TTAI.KO-06.0448 ４３

Physical resource blocks are numbered from 0 to 1DLRB −N in the frequency domain.

The relation between the physical resource block number PRBn in the frequency

domain and resource elements ),( lk in a slot is given by

= RB

scPRB N

kn

<Table 6-17> Physical resource blocks parameters

Configuration RBscN

DLsymbN

Normal cyclic prefix kHz 75=∆f 12 7

A physical resource-block pair is defined as the two physical resource blocks in one

subframe having the same physical resource-block number PRBn .

The size of a virtual resource block group is four times that of a physical resource

block. A pair of virtual resource block groups over two slots in a subframe is assigned

together by a single virtual resource block group number, VRBn .

6.3.2.3.1 Virtual resource block groups of localized type

Virtual resource block groups of localized type are numbered from 0 to 1DLVRBG −N ,

where DLRB

DLVRBG4 NN = . Virtual resource block group of index

DLVRBGn is mapped to a set

of physical resource block pairs given by { }34,24,14,4 DLVRBG

DLVRBG

DLVRBG

DLVRBG +++ nnnn .

6.3.2.4 Resource-element groups (xREGs)

xREGs are used for defining the mapping of control channels to resource elements.

Each OFDM symbol has 16 xREGs.

The xREG of index xREGn ∈ {0, 1, …, 15} consists of resource elements ),( lk with

mkkk 610 ++= where

- RBscxREG0 6 Nnk ⋅⋅= ,

- { }5,4,1,01 =k ,

- { }11,...,2,1,0=m ,


TTAI.KO-06.0448 ４４

The OFDM symbol index is given by either of l = 0 or l = {0, 1}.

6.3.2.5 Guard Period for TDD Operation

The guard time necessary for switching transmission direction is obtained by

puncturing the OFDM symbol prior to an uplink transmission.

6.3.3 General structure for downlink physical channels

The baseband signal representing a downlink physical channel is defined in terms of

the following steps:

- scrambling of coded bits in a codeword to be transmitted on a physical channel

- modulation of scrambled bits to generate complex-valued modulation symbols

- mapping of the complex-valued modulation symbols onto one or several

transmission layers

- precoding of the complex-valued modulation symbols on each layer for

transmission on the antenna ports

- mapping of complex-valued modulation symbols for each antenna port to

resource elements

- generation of complex-valued time-domain OFDM signal for each antenna port

- analog beamforming based on the selected beam

(Figure 6-14)Overview of physical channel processing

6.3.3.1 Scrambling

For an codeword q, the block of bits )1(),...,0( )(

bit)()( −qqq Mbb , where

)(bitqM is the number

of bits in codeword q transmitted on the physical channel in one subframe, shall be

scrambled prior to modulation, resulting in a block of scrambled bits

)1(~

),...,0(~ (q)

bit)()( −Mbb qq

according to

( ) 2mod)()()(~ )()()( icibib qqq +=


TTAI.KO-06.0448 ４５

where the scrambling sequence )()( ic q is given by clause 7.2. The scrambling

sequence generator shall be initialised at the start of each subframe, where the

initialisation value of initc depends on the transport channel type according to

20mod

PDSCHfor22/22 cellID

91314RNTIinit

ss

s

nnNnqnc

=+⋅+⋅+⋅=

Only one codewords can be transmitted in one subframe, i.e., 0=q .

6.3.3.2 Modulation

For an codeword q

, the block of scrambled bits )1(

~),...,0(

~ (q)bit

)()( −Mbb qqshall be

modulated as described in clause 7.1 using one of the modulation schemes in <Table

6-18>, resulting in a block of complex-valued modulation symbols

)1(),...,0( (q)symb

)()( −Mdd qq.

<Table 6-18> Modulation schemes


xPDSCH QPSK, 16QAM, 64QAM

6.3.3.3 Layer mapping

The complex-valued modulation symbols for the codeword to be transmitted are

mapped onto one or two layers. Complex-valued modulation symbols

)1(),...,0( (q)symb

)()( −Mdd qq for codeword

q shall be mapped onto the layers

[ ]Tixixix )(...)()( )1()0( −= υ,


where υ is the number of layers and layersymbM

is

the number of modulation symbols per layer.

6.3.3.3.1 Layer mapping for transmission on a single antenna port



)()( )0()0( idix =


TTAI.KO-06.0448 ４６

with (0)symb

layersymb MM =

.

6.3.3.3.2 Layer mapping for spatial multiplexing

For spatial multiplexing, the layer mapping shall be done according to <Table 6-19>.

The number of layers υ is less than or equal to the number of antenna ports P

used for transmission of the physical channel.

<Table 6-19> Codeword-to-layer mapping for spatial multiplexing

Number of

layers

Number of

codewords

Codeword-to-layer mapping


1 1 )()( )0()0( idix = )0(

symblayersymb MM =

2 1 )12()(

)2()()0()1(

)0()0(

+==

idixidix

2)0(

symblayersymb MM =

6.3.3.3.3 Layer mapping for transmit diversity

For transmit diversity, the layer mapping shall be done according to <Table 6-20>.

There is only one codeword and the number of layers υ is equal to the number of

antenna ports P used for transmission of the physical channel.




2 1 )12()(

)2()()0()1(

)0()0(

+=

=

idix

idix

2)0(symb

layersymb MM =

6.3.3.4 Precoding

The precoder takes as input a block of vectors[ ]Tixixix )(...)()( )1()0( −= υ

,


from the layer mapping and generates a block of

vectors[ ]Tp iyiy ...)(...)( )(= ,

1,...,1,0 apsymb −= Mi

to be mapped onto resources on each of

the antenna ports, where )()( iy p represents the signal for antenna port

p.


TTAI.KO-06.0448 ４７

6.3.3.4.1 Precoding for transmission on a single antenna port

For transmission on a single antenna port, precoding is defined by

)()( )0()( ixiy p =

where p

is the single antenna port number used for transmission of the physical

channel and 1,...,1,0 ap

symb −= Mi,

layersymb

apsymb MM =

.

6.3.3.4.2 Precoding for transmit diversity

Precoding for transmit diversity is only used in combination with layer mapping for

transmit diversity as described in clause 6.3.3.3. The precoding operation for transmit

diversity is defined for two antenna ports.

For transmission on two antenna ports, 1p and 2p indicated in the DCI format B1 the

output [ ]Tpp iyiyiy )()()( )()( 21= , 1,...,1,0 ap

symb −= Mi of the precoding operation is defined

by

( )( )( )( )

−

−=

++

)(Im)(Im)(Re)(Re

001010010

001

21

)12()12(

)2()2(

)1(

)0(

)1(

)0(

)(

)(

)(

)(

2

1

2

1

ixixixix

jjj

j

iyiy

iyiy

p

p

p

p

for1,...,1,0 layer

symb −= Mi with

layersymb

apsymb 2MM =

.

PrecodingW

v layers

DM-RS 0DM-RS 1

P antenna ports

(Figure 6-15) DM-RS location for transmit diversity

For transmit diversity, DM-RS is located after precoding with P antenna ports as



TTAI.KO-06.0448 ４８

6.3.3.4.3 Precoding for spatial multiplexing using antenna ports with UE-specific

reference signals

Precoding for spatial multiplexing using antenna ports with UE-specific reference

signals is only used in combination with layer mapping for spatial multiplexing as

described in clause 6.3.3.2. Spatial multiplexing using antenna ports with UE-specific

reference signals supports up to two antenna ports to enable MU-MIMO capability and

the set of antenna ports used is { }15,...,8∈p .

In the following let, 1p and 2p , denote the two antenna ports indicated by DCI format

B2.

For transmission of one layer on antenna port 1p , the precoding operation is defined

by:

1( ) (0)( ) ( )py i x i =

where 1,...,1,0 ap

symb −= Mi,

layersymb

apsymb MM =

.

For transmission of two layers on antenna port 1p and 2p , the precoding operation is

defined by:

=

)()(

)()(

)1(

)0(

)(

)(

2

1

ixix

iyiy

p

p

where 1,...,1,0 ap

symb −= Mi,

layersymb

apsymb MM =

.

6.3.3.5 Mapping to resource elements

For each of the antenna ports used for transmission of the physical channel, the block

of complex-valued symbols )1(),...,0( ap

symb)()( −Myy pp

shall conform to the downlink

power allocation and be mapped in sequence starting with )0()( py to resource

elements ( )lk, that are in the resource blocks assigned for transmission.

The mapping to resource elements ( )lk, on antenna port p

not reserved for other

purposes shall be in increasing order of first the index k over the assigned physical

resource blocks and then the index l , starting with the first slot in a subframe.


TTAI.KO-06.0448 ４９

6.3.4 Physical downlink shared channel (xPDSCH)

The physical downlink shared channel shall be processed and mapped to resource

elements as described in clause 6.3 with the following additions and exceptions:

- The xPDSCH shall be transmitted on υ antenna port(s) in the set { }15,...,9,8∈p ,

where the number of layers used for transmission of the xPDSCH υ is one or two.

- xPDSCH is not mapped to resource elements in the OFDM symbol carrying an

xPDCCH associated with the xPDSCH.

- xPDSCH is not mapped to resource elements reserved for PCRS. If no PCRS is

transmitted, xPDSCH is mapped to the PCRS REs. If PCRS is transmitted in

antenna port 60 or 61 or both, xPDSCH is not mapped to the PCRS REs for both

antenna port 60 and 61.

- They are not defined to be used for UE-specific reference signals associated

with xPDSCH for any of the antenna ports in the set {8, 9, …, 15}.

- The index l in the first slot in a subframe fulfills DataStartll ≥ .

- The index l in the second slot in a subframe fulfils.

6.3.5 Physical broadcast channel

The Physical broadcast channel is transmitted using the same multiple beams used for

beam reference signals in each OFDM symbol.

6.3.5.1 Scrambling

The block of bits )1(),...,0( bit −Mbb , where bitM , the number of bits transmitted on the

physical broadcast channel, equals 5248, shall be scrambled with a cell-specific

sequence prior to modulation, resulting in a block of scrambled bits )1(~

),...,0(~

bit −Mbb

according to

( ) 2mod)()()(~

icibib +=


shall be initialised with cellIDinit Nc = in each radio frame fulfilling .


TTAI.KO-06.0448 ５０

6.3.5.2 Modulation

The block of scrambled bits )1(~

),...,0(~

bit −Mbb shall be modulated as described in

clause 7.1, resulting in a block of complex-valued modulation

symbols)1(),...,0( symb −Mdd. <Table 6-21>specifies the modulation mappings applicable

for the physical broadcast channel.

<Table 6-21> xPBCH modulation schemes


xPBCH QPSK

6.3.5.3 Layer mapping and precoding

The block of modulation symbols )1(),...,0( symb −Mdd shall be mapped to layers according

to one of clause 6.3.3.3 and precoded according to clause 6.3.4.2, resulting in a

block of vectors( ) ( ) ( ) ( )[ ]Tiyiyiy 10 ~~)(~ = ,

1,...,0 symb −= Mi. Then block of vectors

( ) ( ) ( ) ( )[ ]Tiyiyiyiy )()( )7(10 = is obtained by setting )(~)( )0()( iyiy p = for

}6,4,2,0{∈p and )(~)( )1()( iyiy p = for }7,5,3,1{∈p , where )()( iy p represents the signal

for antenna port p .The antenna ports p = 0…7 used for xPBCH are identical to the

antenna ports p = 0..7 used for the mapping of BRS according to 6.7.4.2.


The block of complex-valued symbols is transmitted during 4

consecutive radio frames starting in each radio frame fulfilling . The block

of complex-valued symbols are divided into 16 sub-block of

complex-valued symbols, which is given by

Sub-block 0 and 1: , ,


TTAI.KO-06.0448 ５１







Sub-block 14 and 15: ,

The sub-frames 0 and 25 in each radio frame shall be assigned to transmit xPBCH

together with synchronization signals. The sub-block of complex-valued symbols is

repeated on each OFDM symbol in the subframe and it may be transmitted by different

analog beams. The sub-blocks are repeated – although transmitted with different

information -- after every four radio frames, i.e., after every eight synchronization

sub-frames. Focusing on four adjacent radio frames whose first eight bits of SFN are

same and indexing the sub-frames of these radio frames from 0 to 199, sub-block 2i

and 2i+1 are transmitted in sub-frame 25i where .

The even indexed sub-block of complex-valued symbols transmitted shall be mapped

in increasing order of the index in each OFDM symbol. The resource-element indices

are given by:

The odd indexed sub-block of complex-valued symbols transmitted in each subframe


TTAI.KO-06.0448 ５２

shall be mapped in decreasing order of the index in each OFDM symbol. The

resource-element indices are given by:

where and Figures 6.7.4.2-1 illustrates the resource elements

used for xPBCH according to the numerical definition.

6.3.5.1 Extended Physical broadcast channel

The system information block to support standalone mode shall be transmitted on

ePBCH via two antenna ports. The ePBCH is transmitted using the same multiple

beams in consecutive OFDM symbols, where .

The ePBCH is transmitted on a predefined or configured subframe. The essential

system information for initial cell attachment and radio resource configuration shall be

included in the system information block.

6.3.5.1.1 Scrambling

The block of bits )1(),...,0( bit −Mbb , where bitM , the number of bits transmitted on the

extended physical broadcast channel, equals to 2000, shall be scrambled with a cell-

specific sequence prior to modulation, resulting in a block of scrambled bits

)1(~

),...,0(~

bit −Mbb according to

( ) 2mod)()()(~

icibib +=


shall be initialised with

where ; sn is the slot number within a radio frame and is the OFDM

symbol number within one subframe, and .


TTAI.KO-06.0448 ５３

6.3.5.1.2 Modulation


),...,0(~

bit −Mbb shall be modulated as described in


symbols)1(),...,0( symb −Mdd. <Table 6-22> specifies the modulation mappings applicable

for the extended physical broadcast channel.

<Table 6-22>ePBCH modulation schemes.


ePBCH QPSK

6.3.5.1.3 Layer mapping and precoding

The block of modulation symbols )1(),...,0( symb −Mdd

shall be mapped to layers

according to one of clause 6.3.3.3 with symb)0(

symb MM = and precoded according to

clause 6.3.4.2, resulting in a block of vectors

[ ]Tiyiyiy )(,)()( )51()50(= , 1,...,0 symb −= Mi, where )()50( iy and )()51( iy correspond to signals

for antenna port 50 and 51, respectively.

6.3.5.1.4 ePBCH Configuration

The ePBCH transmission periodicity is configured by xPBCH, which is given by <Table

6-23>.

<Table 6-23> ePBCH transmission periodicity

Indication bit ePBCH transmission periodicty

00 ePBCH transmission is off N/A

01 40ms 4

10 80ms 8

11 160ms 16

The required number of subframes for ePBCH transmission is determined according to

BRS transmission period, which is given by <Table 6-24>.


TTAI.KO-06.0448 ５４

<Table 6-24> The number of subframes for ePBCH transmission according to BRS

transmission period

BRS transmission period # of subframes,

1 slot < 5ms 1

1 subframes = 5ms 2

2 subframes = 10ms 4

4 subframes = 20ms 8

When the ePBCH transmission is on, the multiple subframes for ePBCH transmission

are configured in the radio frame fulfilling . The subframes in each

configured radio frame shall be assigned to transmit ePBCH according to <Table 6-

25>.

<Table 6-25> Subframe configuration in each configured radio frame

Value of Configured subframes

in each configured radio frame

≥ 1 4

< 1 29, 4


In each OFDM symbol of the configured subframes, the block of complex-valued

symbols is transmitted via two antenna ports. The block of

complex-valued symbols is transmitted using identical beams in 2 consequtive OFDM

symbols. The set of logical beam sweeping indices and their order across pairs of

OFDM symbols in ePBCH subframes is identical to the set of logical beam indices and

their order across OFDM symbols used for BRS transmission during BRS transmission

period. The beam indexing initialization for ePBCH is such that the set of logical beam

indices for all , is applied on the first symbol pair of the first

ePBCH subframe in

The block of complex-valued symbols transmitted in each OFDM symbol shall be

mapped in increasing order of the index k excluding DM-RS associated with ePBCH.


TTAI.KO-06.0448 ５５

The resource-element indices are given by

where .

6.3.6 Physical downlink control channel (xPDCCH)

6.3.6.1 xPDCCH formats

The physical downlink control channel (xPDCCH) carries scheduling assignments. A

physical downlink control channel is transmitted using an aggregation of one or

several consecutive enhanced control channel elements (CCEs) where each CCE

consists of multiple resource element groups (REGs), defined in clause 6.2.4. The

number of CCEs used for one PDCCH depends on the PDCCH format and the number

of REGs per CCE is given by <Table 6-26>.

<Table 6-26> Supported xPDCCH formats

PDCCH

format

Number of

CCEs

Number of resource-element

groups

Number of xPDCCH

bits

0 2 2 192

1 4 4 384

2 8 8 768

3 16 16 1536

6.3.6.2 xPDCCH multiplexing and scrambling

The block of bits )1(),...,0( bit −Mbb to be transmitted on an xPDCCH in a subframe shall

be scrambled, resulting in a block of scrambled bits )1(~

),...,0(~

bit −Mbb according to

( ) 2mod)()()(~

icibib +=


TTAI.KO-06.0448 ５６

where the UE-specific scrambling sequence )(ic is given by clause 7.2. The

scrambling sequence generator shall be initialized with xPDCCHID

9sinit 22 nnc +⋅= where

the quantity xPDCCHIDn is given by

- cellID

xPDCCHID Nn = if no value for IDn is provided by higher layers

- IDxPDCCHID nn = otherwise.

6.3.6.3 Modulation


),...,0(~

tot −Mbb shall be modulated as described in


symbols)1(),...,0( symb −Mdd

. <Table 6-27> specifies the modulation mappings

applicable for the physical downlink control channel.

<Table 6-27> PDCCH modulation schemes


xPDCCH QPSK

6.3.6.4 Layer mapping and precoding

The layer mapping with space-frequency block coding shall be done according to

<Table 6-28>. There is only one codeword and the two-layer transmission is used.


Number of layers Number of codewords

Codeword-to-layer mapping


2 1 )12()(

)2()()0()1(

)0()0(

+=

=

idix

idix

2)0(symb

layersymb MM =

For transmission on two antenna ports, { }109,107∈p , the output[ ]Tiyiyiy )()()( )109()107(=

,

1,...,1,0 apsymb −= Mi

of the precoding operation is defined by


TTAI.KO-06.0448 ５７

( )( )( )( )

( )( )( )( )

( )( )( )( )( )( )( )( )( )( )( )( )

−

−=

++

ixixixix

jjj

j

iyiy

iyiy

1

0

1

0

109

107

109

107

ImImReRe

001010010

001

21

1212

22

for1,...,1,0 layer

symb −= Mi with

layersymb

apsymb 2MM =

.


The block of complex-valued symbols )1(),...,0( symb −Myy shall be mapped in sequence

starting with )0(y to resource elements ( )lk, on the associated antenna port which

meet all of the following criteria:

- they are part of the xREGs assigned for the xPDCCH transmission, and

- l ∈{0, 1} equals the OFDM symbol index

The mapping to resource elements ( )lk, on antenna port p meeting the criteria above

shall be in increasing order of the index k .

6.3.7 Reference signals

The following types of downlink reference signals are defined:

- UE-specific Reference Signal (DM-RS) associated with xPDSCH

- UE-specific Reference Signal (DM-RS) associated with xPDCCH

- CSI Reference Signal (CSI-RS)

- Beam measurement Reference Signal (BRS)

- Beam Refinement Reference Signal (BRRS)

- Phase noise compensation reference signal, associated with transmission of

PDSCH (PCRS)

- Reference Signal (DM-RS) associated with ePBCH

There is one reference signal transmitted per downlink antenna port.

6.3.7.1 UE-specific reference signals associated with xPDCCH

The demodulation reference signal associated with xPDCCH is transmitted on the


TTAI.KO-06.0448 ５８

same antenna port { }109,107∈p as the associated xPDCCH physical resource;


For any of the antenna ports { }109,107∈p , the reference-signal sequence )(mr is

defined by

( ) ( ) 2310 ,)12(212

1)2(212

1)( ,...,,mmcjmcmr =+⋅−+⋅−=.

The pseudo-random sequence )(nc is defined in clause 7.2. The pseudo-random


( ) ( )20mod

21212/ xPDCCHSCID

16xPDCCHIDinit

ss

s

nnnnnc

=+⋅+⋅+=

at the start of each subframe where 2xPDCCH

SCID =n and

xPDCCHIDn is configured by higher

layers where the quantity xPDCCHIDn is given by

- cellID

xPDCCHID Nn = if no value for IDn is provided by higher layers

- IDxPDCCHID nn = otherwise.


For the antenna port { }109,107∈p shall be mapped to complex-valued modulation

symbols )(

,plka


( ) )'()(, mrmwa lpplk ′′=

where

( ) 2/'62mod'20 mmkk ⋅+++=

2mod'mm =′′ RBscxREG0 6 Nnk ⋅⋅=

160 xREG <≤ n

23,...,1,0'=m

The sequence )(iwp is given by <Table 6-29>.


TTAI.KO-06.0448 ５９


Antenna port p

[ ])1()0( pp ww

107 [ ]11 ++

109 [ ]11 −+

6.3.7.2 UE-specific reference signals associated with xPDSCH

UE specific reference signals associated with xPDSCH

- are transmitted on antenna port(s) { }15,...,8∈p indicated in DCI.

- are present and are a valid reference for xPDSCH demodulation only if the

xPDSCH transmission is associated with the corresponding antenna port;


corresponding xPDSCH is mapped.

A UE-specific reference signal associated with xPDSCH is not transmitted in resource

elements ( )lk, in which one of the physical channels are transmitted using resource

elements with the same index pair ( )lk, regardless of their antenna port p

.


For any of the antenna ports { }15,...,9,8∈p , the reference-signal sequence ( )mr is

defined by

( ) ( )( ) ( )( ) 13,...,1,0,12212

12212


.



( ) ( )20mod

21212/

ss

SCID16)(

IDsinitSCID

nnnnnc n

=+⋅+⋅+=


The quantities )(


- cellID




TTAI.KO-06.0448 ６０

- ii nn DMRS,

ID)(

ID = otherwise

The value of SCIDn is zero unless specified otherwise. For an xPDSCH transmission,

SCIDn is given by the DCI format associated with the xPDSCH transmission.


For antenna port 1p used for single port transmission, or ports { }21, pp used for two-

port transmission in a physical resource block with frequency-domain index BPRn

assigned for the corresponding xPDSCH transmission, a part of the reference signal

sequence )(mr shall be mapped to complex-valued modulation symbols )(

,plka

in a

subframe according to

( ) ( ) ( )''''', krkwa pplk ⋅=

where

{ }{ }{ }{ }

2,1,0'case speedhigh for 10 2,

24

'''

78mod4 if148mod if0

''

15,11314,10213,9112,80

'

''4 PRBRBsc

=

=

=

≤≤<

=

∈∈∈∈

=

+⋅+=

m

l

kk

kk

k

pppp

k

knNmk

Information indicating whether 2=l or { }10,2=l is signaled via higher layer signaling.

The sequence )(iwp is given by <Table 6-30>.


TTAI.KO-06.0448 ６１

<Table 6-30>The sequence )(iwp

Antenna port p ( ) ( )[ ]10 pp ww

8 [ ]11 ++

9 [ ]11 ++

10 [ ]11 ++

11 [ ]11 ++

12 [ ]11 −+

13 [ ]11 −+

14 [ ]11 −+

15 [ ]11 −+

Resource elements ( )lk, used for transmission of UE-specific reference signals to

one UE on any of the antenna ports in the set S , where { }12,8=S , { }13,9=S ,

{ }14,10=S or { }15,11=S shall

- not be used for transmission of xPDSCH on any antenna port in the same

subframe, and

- not be used for UE-specific reference signals to the same UE on any antenna

port other than those in S in the same subframe.

(Figure 6-16) illustrates the resource elements used for UE-specific reference signals

for antenna ports 8, 9, 10, 11, 12, 13, 14 and 15.


TTAI.KO-06.0448 ６２

0 1 2 3 4 5 6 7 8 9 10 11 12 13R8R9R10R11


TTAI.KO-06.0448 ６３

0 1 2 3 4 5 6 7 8 9 10 11 12 13R12R13R14R15

(Figure 6-16) Mapping of UE-specific reference signals, antenna ports 8, 9, 10, 11, 12, 13, 14

and 15.


TTAI.KO-06.0448 ６４

6.3.7.3 CSI reference signals

CSI reference signals are transmitted on 8 or 16 antenna ports using 23,...,16=p or

31,...,16=p respectively. The antenna ports associated with CSI reference signals are

paired into CSI-RS groups (CRGs). A CRG comprises of two consecutive antenna

ports starting from antenna port 16=p . One or more of the CRGs is associated with

zero-power and used as interference measurement resource. The transmission of

CSI-RS is dynamically indicated in the xPDCCH.


The reference-signal sequence )(

s, mr nl is defined by

( ) ( ) 123,...,1,0 ,)12(21

21)2(21

21)( DLmax,

RB, s−=+⋅−+⋅−= Nmmcjmcmr nl

where sn is the slot number within a radio frame and l is the OFDM symbol number

within the slot. The pseudo-random sequence )(ic is defined in clause 7.2. The

pseudo-random sequence generator shall at the start of each OFDM symbol be

initialized with

( )( ) ( ) 12121172 CSIID

CSIIDs

10init +⋅++⋅⋅+++⋅⋅= NNlnc

20modss nn =

The quantity CSIIDN is configured to the UE using higher layer signaling.


A CSI-RS allocation comprises of one symbol (symbol 12 or symbol 13) or two

consecutive symbols (symbols 12 and 13).

In a subframe used for CSI-RS transmission, the reference signal sequence )(

s, mr nl

shall be mapped to complex-valued modulation symbols )(

,plka

on antenna port p

according to

)(s,

)(, mra nlplk =


TTAI.KO-06.0448 ６５

1)2mod( and,}31,30,29,28,27,26,25,24{ for 6}23,22,21,20,19,18,17,16{ for 5

}31,30,29,28,27,26,25,24{ for 8}23,22,21,20,19,18,17,16{ for 0

816

=

∈∈

=

∈∈

−+−=

snpp

l

pp

mpk

The mapping is illustrated in (Figure 6-17).

(Figure 6-17)Mapping of CSI-RS for 2 symbol allocation

A UE can be configured with a one symbol allocation or a two symbol allocation of a

CSI resource. Each of the REs comprising a CSI resource are configured as either

- CSI-RS resource (state 0);

- CSI IM resource (state 1)

A CSI resource configuration is configured via high layer signalling, and it comprises

of a 16 bit bitmap indicating RE mapping described in <Tables 6-31>.

The symbol allocation for a CSI resource(s) corresponding to a UE within a subframe

is dynamically indicated by the ‘resource configuration’ field of the DCI.


TTAI.KO-06.0448 ６６

<Table 6-31> 16 bit bitmap which is indicating a CSI reosurce configuration

k=0,8,16,

l=12

k=1,9,17, l=12

k=2,10,18,

l=12

k=3,11,19, l=12

k=4,12,20, l=12

k=5,13,21, l=12

k=6,14,22, l=12

k=7,15,23, l=12

State 0/1 0/1 0/1 0/1 0/1 0/1 0/1 0/1

k=0,8,16, l=13

k=1,9,17, l=13

k=2,10,18, l=13

k=3,11,19, l=13

k=4,12,20, l=13

k=5,13,21, l=13

k=6,14,22, l=13

k=7,15,23, l=13

State 0/1 0/1 0/1 0/1 0/1 0/1 0/1 0/1

6.3.7.4 Beam reference signals

Beam reference signals are transmitted on one or several of antenna ports, p= 0…7.


The reference-signal sequence )(mrl is defined by

where l =0,1,…,13 is the OFDM symbol number within a subframe. The pseudo-

random sequence )(ic is defined in clause 7.2. The pseudo-random sequence

generator shall be initialised with

at the start of each OFDM

symbol, where and .


The reference signal sequence shall be mapped to complex-valued modulation

symbols )(

,plka

used as reference symbols for antenna port p

according to


TTAI.KO-06.0448 ６７

where and the sequence )(iwp is defined in <Table 6-32>.


Antenna port

p

0

1

2

3

4

5

6

7

Resource elements ( )lk, used for transmission of beam reference signals on any of

the antenna ports in a slot shall be shared based on the orthogonal cover code in

<Table 6-32>. (Figures 6-18) illustrates the resource elements used for xPBCH and

beam reference signal transmission according to the numerical definition in 6.5.3 and

6.7.4.2 at each OFDM symbol. Also shown is the cover code pw on each resource

element used for beam reference signal transmission on antenna portp.


TTAI.KO-06.0448 ６８

18 RBsSS

}

0Antenna port number

8 REsfor BRS

41 RBs

41 RBs

4 REsfor xPBCH

P1

+ + + [+1 -1 +1 -1 +1 -1 +1 -1][+1 +1 +1 +1 +1 +1 +1 +1] DM-RS

(Figure 6-18) Mapping of beam reference signals including xPBCH and DM-RS

6.3.7.4.3 Beam reference signal transmission period configuration

The beam reference signal transmission period shall be configured by higher layers,

which can be set to single slot, 1 subframe, 2 subframes or 4 subframes. In each

configuration, the maximum # of opportunities for different TX beam training and the

logical beam indexes are given by <Table 6-33>,

<Table 6-33> Logical beam index mapping according to BRS transmission period

BRS configuarion

(Indication bits)

BRS transmission

period

Maximum # of beam

training opportunities Logical beam index

00 1 slot < 5ms

01 1 subframe = 5ms

10 2 subframes = 10ms

11 4 subframes = 20ms

where is the total number of antenna ports. The logical beam index mapping

according to the transmission period is given by <Table 6-34>,


TTAI.KO-06.0448 ６９

<Table 6-34> Beam index mapping to OFDM symbol in each beam reference signal

BRS configuarion 00 01

1st BRS Transmission

Region

BRS configuarion 10 11

1st BRS Transmission

Region

2nd BRS Transmission

Region

3rd BRS Transmission

Region

4th BRS Transmission

Region

where BRS transmission region is defined as a slot (in case of ‘00’) or a subframe (in

all configuration cases except ‘00’) to transmit BRS, is antenna port

number, is the logical beam index to transmit beam reference signals for antenna

port number in i-th OFDM symbol in n-th beam reference signal slot or subframe.

The beam indexing initialization is such that logical beam index for all

is applied in for .

6.3.7.5 Beam refinement reference signals

Beam refinement reference signals are transmitted on up to eight antenna ports

using . The transmission and reception of BRRS is dynamically scheduled

in the downlink resource allocation on xPDCCH.


TTAI.KO-06.0448 ７０


The reference signal can be generated as follows.

where sn is the slot number within a radio frame; l is the OFDM symbol number

within the slot; denotes a pseudo-random sequence defined by clause 7.2. The

pseudo-random sequence generator shall at the start of each OFDM symbol be

initialised with:

The quantity is configured to the UE via RRC signalling.


The reference signal sequence shall be mapped to complex-valued

modulation symbols on antenna port according to

where

The BRRS can be transmitted in OFDM symbols l within a subframe, where l is

configured by ‘Indication of OFDM symbol index for CSI-RS/BRRS allocation’ in DCI

format. On each Tx antenna port, BRRS may be transmitted with different Tx beam.


TTAI.KO-06.0448 ７１

(Figure 6-19) Mapping of BRRS showing a 1 symbol allocation, e.g. l=12

6.3.7.6 Phase noise compensation reference signal, associated with transmission of

PDSCH

Phase noise compensation reference signals associated with xPDSCH

- are transmitted on antenna port(s) 60=p and/or 61=p signaled in DCI;

- are present and are a valid reference for phase noise compensation only if the

xPDSCH transmission is associated with the corresponding antenna port;

- are transmitted only on the physical resource blocks and symbols upon which the

corresponding xPDSCH is mapped;

- are identical in all symbols corresponding to xPDSCH allocation;


For any of the antenna ports { }61,60∈p , the reference-signal sequence ( )mr is


TTAI.KO-06.0448 ７２

defined by

( ) ( )( ) ( )( ) 14/,...,1,0,12212

12212


.



( ) ( ) SCID16)(



The quantities )(


cellID


inPCRS,ID is provided by higher layers

ii nn PCRS,ID

)(ID = otherwise

The value of SCIDn is zero unless specified otherwise. For an xPDSCH transmission.


For antenna ports { }61,60∈p , in a physical resource block with frequency-domain

index 'BPRn assigned for the corresponding xPDSCH transmission, a part of the

reference signal )(mrshall be mapped to complex-valued modulation symbols

)(,plka

for all xPDSCH symbols in a subframe according to:

( ) )''(', kra plk =

,

The starting resource block number of xPDSCH physical resource allocation xPDSCHPRBn in

the frequency domain, resource allocation bandwidth in terms of number of resource

blocks xPDSCHPRBN and resource elements

)',( lk in a subframe is given by

( )

1,...,2,1,0'

,...,4/'''

61236024

4''

'''

'

'RBsc

−=

=

=

∈∈

=

+⋅+⋅=

xPDSCHPRB

xPDSCHlast

xPDSCHfirst

xPDSCHPRB

Nm

lllmk

pp

k

kknNk

where 'l is the symbol index within a subframe. xPDSCHfirstl '

and xPDSCH

lastl ' are symbol

indices of the first and last of xPDSCH, respectively for the given subframe.


TTAI.KO-06.0448 ７３

Resource elements ( )lk ′, used for transmission of UE-specific phase noise

compensation reference signals on any of the antenna ports in the set S , where

{ }60=S and { }61=S shall not be used for transmission of xPDSCH on any antenna

port in the same subframe.

(Figure 6-20) 1 illustrates the resource elements used for phase noise compensation

reference signals for antenna ports 60 and 61 when xPDSCH is transmitted from

3' =xPDSCHfirstl

to 13' =xPDSCH

lastl.

0 1 2 3 4 5 6 7 8 9 10 11 12 130 611 6023456789

1011121314151617181920212223242526272829303132333435363738394041424344454647

(Figure 6-20) Mapping of phase noise compensation reference signals, antenna ports 60 and

61 in case of

xPDSCHfirstl '

=3 and

xPDSCHlastl '

=13.


TTAI.KO-06.0448 ７４

6.3.7.7 Demodulation reference signals associated with ePBCH

The demodulation reference signal associated with ePBCH is transmitted on the

antenna port . The analog beams for reference signal transmission shall

be identical with the analog beams for the ePBCH transmission in each OFDM symbol.


The reference-signal sequence )(

s, mr nl is defined by

where , sn is the slot number within a radio frame and is the OFDM

symbol number within one subframe, and The pseudo-random

sequence )(ic is defined in clause 7.2. The pseudo-random sequence generator

shall be initialised with

.

at the start of each OFDM symbol.


The reference signal sequence )(

s, mr nl shall be mapped to complex-valued

modulation symbols )(

,plka

used as reference symbols for antenna port p in each

OFDM symbol according to


TTAI.KO-06.0448 ７５

where and the sequence )(iwp is defined in <Table 6-35>.

<Table 6-35> The sequence in odd OFDM symbol

Antenna port p [ ])1()0( pp ww

500 [ ]11 ++

501 [ ]11 −+

<Table 6-36>The sequence in even OFDM symbol

Antenna port p [ ])1()0( pp ww

500 [ ]11 ++

501 [ ]11 +−

6.3.7.8 Demodulation reference signal for xPBCH

BRS transmitted OFDM symbol is the demodulation reference signal associated with

xPBCH in OFDM symbol .

6.3.8 Synchronization signals

There are 504 unique physical-layer cell identities. The physical-layer cell identities

are grouped into 168 unique physical-layer cell-identity groups, each group

containing three unique identities. The grouping is such that each physical-layer cell

identity is part of one and only one physical-layer cell-identity group. A physical-layer

cell identity (2)ID

(1)ID

cellID 3 NNN += is thus uniquely defined by a number

(1)IDN in the range of 0

to 167, representing the physical-layer cell-identity group, and a number(2)IDN in the

range of 0 to 2, representing the physical-layer identity within the physical-layer cell-

identity group.


TTAI.KO-06.0448 ７６

6.3.8.1 Primary synchronization signal

The primary synchronization signal is used to acquire symbol timing and transmitted in

symbol 0-13 in subframes 0 and 25 on antenna ports 313,...,300=p . The same

sequence is used in all symbols.


The sequence )(nd used for the primary synchronization signal is generated from a

frequency-domain Zadoff-Chu sequence according to

=

== ++−

+−

61,...,32,31

30,...,1,0)(63

)2)(1(

63)1(

ne

nend nnuj

nunj

u π

π

where the Zadoff-Chu root sequence index u is given by <Table 6-37>.

<Table 6-37> Root indices for the primary synchronization signal

(2)IDN Root index u

0 25

1 29

2 34


The primary synchronization signal is transmitted using the same multiple beams used

for beam reference signals in each OFDM symbol. The UE shall not assume that the

primary synchronization signal transmitted on any of the ports 313,...,300=p is

transmitted on the same antenna port as any of the downlink reference signals. The

UE shall not assume that any transmission instance of the primary synchronization

signal is transmitted on the same antenna port, or ports, used for any other

transmission instance of the primary synchronization signal in the same subframe.

The sequence ( )nd shall be mapped to the resource elements according to


TTAI.KO-06.0448 ７７

( )

lpl

NNnk

nnda plk

+==

+−=

==

30013,...,1,0

231

61,...,0 ,RBsc

DLRB

)(,

The primary synchronization signal shall be mapped to OFDM symbols 0-13 in

subframes 0 and 25 in each radio frame.

Resource elements ),( lk in the OFDM symbols used for transmission of the primary

synchronization signal where

66,...63,62,1,...,4,52

31RBsc

DLRB

−−−=

+−=

n

NNnk

are reserved and not used for transmission of the primary synchronization signal.

6.3.8.2 Secondary synchronization signal

The secondary synchronization signal is transmitted in symbol 0-13 in subframes 0

and 25 on antenna ports 313,...,300=p . The same sequence is used in all symbols.


The sequence )61(),...,0( dd used for the second synchronization signal is an interleaved

concatenation of two length-31 binary sequences. The concatenated sequence is

scrambled with a scrambling sequence given by the primary synchronization signal.

The combination of two length-31 sequences defining the secondary synchronization

signal differs between subframes according to

( )( )( ) ( )( ) ( )

=+

=

25 subframein )(0 subframein )(

)12(

25 subframein )(0 subframein )(

)2(

)(11

)(0

)(11

)(1

0)(

1

0)(

0

10

01

1

0

nzncnsnzncns

nd

ncnsncns

nd

mm

mm

m

m

where 300 ≤≤ n . The indices 0m and 1m are derived from the physical-layer cell-

identity group (1)IDN according to

( )

30,30

2)1(,2)1(

31mod13131mod

(1)ID

(1)ID(1)

ID

01

0

NqqqN

qqqNm

mmmmm

=′

+′′+=++=′

+′+=

′=


TTAI.KO-06.0448 ７８

The two sequences )()(0

0 ns m and )()(

11 ns m

are defined as two different cyclic shifts of

the m-sequence )(~ ns according to

( )( )31mod)(~)(

31mod)(~)(

1)(

1

0)(

0

1

0

mnsns

mnsnsm

m

+=

+=

where )(21)(~ ixis −= , 300 ≤≤ i , is defined by

( ) 250 ,2mod)()2()5( ≤≤++=+ iixixix

with initial conditions 1)4(,0)3(,0)2(,0)1(,0)0( ===== xxxxx .

The two scrambling sequences )(0 nc and )(1 nc depend on the primary synchronization

signal and are defined by two different cyclic shifts of the m-sequence )(~ nc

according to

)31mod)3((~)(

)31mod)((~)()2(

ID1

)2(ID0

++=

+=

Nncnc

Nncnc

where { }2,1,0)2(ID ∈N is the physical-layer identity within the physical-layer cell identity

group (1)IDN and )(21)(~ ixic −= , 300 ≤≤ i , is defined by

( ) 250 ,2mod)()3()5( ≤≤++=+ iixixix


The scrambling sequences )()(1

0 nz m and

)()(1

1 nz m are defined by a cyclic shift of the m-

sequence )(~ nz according to

)31mod))8mod(((~)( 0)(

10 mnznz m +=

)31mod))8mod(((~)( 1)(

11 mnznz m +=

where 0m and 1m are obtained from <Table 6-38> and )(21)(~ ixiz −= , 300 ≤≤ i , is

defined by

( ) 250 ,2mod)()1()2()4()5( ≤≤++++++=+ iixixixixix


<Table 6-38> Mapping between physical-layer cell-identity group (1)IDN and the indices 0m

and 1m

(1)IDN 0m 1m

(1)IDN 0m 1m

(1)IDN 0m 1m

(1)IDN 0m 1m

(1)IDN 0m 1m

0 0 1 34 4 6 68 9 12 102 15 19 136 22 27

1 1 2 35 5 7 69 10 13 103 16 20 137 23 28


TTAI.KO-06.0448 ７９

(1)IDN 0m 1m

(1)IDN 0m 1m

(1)IDN 0m 1m

(1)IDN 0m 1m

(1)IDN 0m 1m

2 2 3 36 6 8 70 11 14 104 17 21 138 24 29

3 3 4 37 7 9 71 12 15 105 18 22 139 25 30

4 4 5 38 8 10 72 13 16 106 19 23 140 0 6

5 5 6 39 9 11 73 14 17 107 20 24 141 1 7

6 6 7 40 10 12 74 15 18 108 21 25 142 2 8

7 7 8 41 11 13 75 16 19 109 22 26 143 3 9

8 8 9 42 12 14 76 17 20 110 23 27 144 4 10

9 9 10 43 13 15 77 18 21 111 24 28 145 5 11

10 10 11 44 14 16 78 19 22 112 25 29 146 6 12

11 11 12 45 15 17 79 20 23 113 26 30 147 7 13

12 12 13 46 16 18 80 21 24 114 0 5 148 8 14

13 13 14 47 17 19 81 22 25 115 1 6 149 9 15

14 14 15 48 18 20 82 23 26 116 2 7 150 10 16

15 15 16 49 19 21 83 24 27 117 3 8 151 11 17

16 16 17 50 20 22 84 25 28 118 4 9 152 12 18

17 17 18 51 21 23 85 26 29 119 5 10 153 13 19

18 18 19 52 22 24 86 27 30 120 6 11 154 14 20

19 19 20 53 23 25 87 0 4 121 7 12 155 15 21

20 20 21 54 24 26 88 1 5 122 8 13 156 16 22

21 21 22 55 25 27 89 2 6 123 9 14 157 17 23

22 22 23 56 26 28 90 3 7 124 10 15 158 18 24

23 23 24 57 27 29 91 4 8 125 11 16 159 19 25

24 24 25 58 28 30 92 5 9 126 12 17 160 20 26

25 25 26 59 0 3 93 6 10 127 13 18 161 21 27

26 26 27 60 1 4 94 7 11 128 14 19 162 22 28

27 27 28 61 2 5 95 8 12 129 15 20 163 23 29

28 28 29 62 3 6 96 9 13 130 16 21 164 24 30

29 29 30 63 4 7 97 10 14 131 17 22 165 0 7

30 0 2 64 5 8 98 11 15 132 18 23 166 1 8

31 1 3 65 6 9 99 12 16 133 19 24 167 2 9

32 2 4 66 7 10 100 13 17 134 20 25 - - -

33 3 5 67 8 11 101 14 18 135 21 26 - - -


TTAI.KO-06.0448 ８０


The secondary synchronization signal shall be mapped to the same OFDM symbols as

the primary synchronization signal. The same antenna port as for the primary

synchronization signal shall be used for the secondary synchronization signal in a

given OFDM symbol. The sequence ( )nd shall be mapped to resource elements

according to

p

Resource elements ),( lk in the OFDM symbols used for transmission of the secondary


are reserved and not used for transmission of the secondary synchronization signal.

6.3.8.3 Extended synchronization signal


The sequence used to obtain the extended synchronization signal is the

length-63 Zadoff–Chu (ZC) defined by

The sequence used to obtain extended synchronization signal in OFDM symbol is

defined as cyclic shifts of according to

where the cyclic shifts for are given by <Table 6-39>.


TTAI.KO-06.0448 ８１

<Table 6-39> Cyclic shifts for the extended synchronization signal

Cyclic shift

0 0

1 7

2 14

3 18

4 21

5 25

6 32

7 34

8 38

9 41

10 45

11 52

12 59

13 61

The sequence used for scrambling extended synchronization signal in subframe

is defined by

where the pseudo-random sequence )(mc is defined in clause 7.2. The pseudo-

random sequence generator shall be initialised

with( ) ( ) 121212 cell

IDcellID

10init +⋅++⋅⋅+⋅= NNic

at the start of subframe .

The sequence used for extended synchronization signal is defined by


The extended synchronization signal shall be mapped to the same OFDM symbols as

the primary synchronization signal. The same antenna port as for the primary

synchronization signal shall be used for the extended synchronization signal.

The sequence shall be mapped to resource elements according to


TTAI.KO-06.0448 ８２

0,1,...,62n ),()(, == nda lplk

.

lp += 300

Resource elements ),( lk in the OFDM symbols used for transmission of the extended


are reserved and not used for transmission of the extended synchronization signal.

6.3.9 OFDM baseband signal generation

The time-continuous signal ( )ts pl

)( on antenna port

p in OFDM symbol l in a

downlink slot is defined by

( ) ( )

( ) ∑∑=

−∆−

−=

−∆ ⋅+⋅= +−

2/

1

2)(,

1

2/

2)(,

)(RBsc

DLRB

s,CP)(

RBsc

DLRB

s,CP)(

NN

k

TNtfkjplk

NNk

TNtfkjplk

pl

ll eaeats ππ

for ( ) s,CP0 TNNt l ×+<≤ where 2RB

scDLRB

)( NNkk +=− and 12RB

scDLRB

)( −+=+ NNkk . The

variable N equals 2048 and kHz 75=∆f .

The OFDM symbols in a slot shall be transmitted in increasing order of l , starting with

0=l , where OFDM symbol 0>l starts at time ∑−

=′ ′ +1

0 s,CP )(l

l l TNN within the slot.

<Table 6-40> lists the value of lN ,CP that shall be used. Note that different OFDM

symbols within a slot in some cases have different cyclic prefix lengths.

<Table 6-40> OFDM parameters

Configuration Cyclic prefix length lN ,CP

Normal cyclic prefix kHz 75=∆f

0for 160 =l

6,...,2,1for 144 =l


TTAI.KO-06.0448 ８３

6.3.10 Modulation and upconversion

Modulation and upconversion to the carrier frequency of the complex-valued OFDM

baseband signal for each antenna port is shown in (Figure 6-21).

Split

{ })(Re )( ts pl

{ })(Im )( ts pl

( )tf02cos π

( )tf02sin π−

Filtering)()( ts p

l

(Figure 6-21) Downlink modulation

6.4 Generic functions

6.4.1 Modulation mapper

The modulation mapper takes binary digits, 0 or 1, as input and produces complex-

valued modulation symbols, x=I+jQ, as output.

6.4.1.1 BPSK

In case of BPSK modulation, a single bit, )(ib , is mapped to a complex-valued

modulation symbol x=I+jQ according to <Table 6-41>.

<Table 6-41> BPSK modulation mapping

)(ib I Q

0 21 21

1 21− 21−


TTAI.KO-06.0448 ８４

6.4.1.2 QPSK

In case of QPSK modulation, pairs of bits, )1(),( +ibib , are mapped to complex-valued

modulation symbols x=I+jQ according to <Table 6-42>.

<Table 6-42> QPSK modulation mapping

)1(),( +ibib I Q

00 21 21

01 21 21−

10 21− 21

11 21− 21−

6.4.1.3 16QAM

In case of 16QAM modulation, quadruplets of bits, )3(),2(),1(),( +++ ibibibib , are

mapped to complex-valued modulation symbols x=I+jQ according to <Table 6-43>

<Table 6-43> 16QAM modulation mapping

)3(),2(),1(),( +++ ibibibib I Q

0000 101 101

0001 101 103

0010 103 101

0011 103 103

0100 101 101−

0101 101 103−

0110 103 101−

0111 103 103−

1000 101− 101

1001 101− 103

1010 103− 101

1011 103− 103

1100 101− 101−

1101 101− 103−

1110 103− 101−

1111 103− 103−


TTAI.KO-06.0448 ８５

6.4.1.4 64QAM

In case of 64QAM modulation, hextuplets of bits, )5(),4(),3(),2(),1(),( +++++ ibibibibibib ,

are mapped to complex-valued modulation symbols x=I+jQ according to <Table 6-

44>.

<Table 6-44> 64QAM modulation mapping

)5(),4(),3(),2(),1(),( +++++ ibibibibibib I Q )5(),4(),3(),2(),1(),( +++++ ibibibibibib

I Q

000000 423 423 100000 423− 423 000001 423 421 100001 423− 421

000010 421 423 100010 421− 423

000011 421 421 100011 421− 421

000100 423 425 100100 423− 425

000101 423 427 100101 423− 427

000110 421 425 100110 421− 425

000111 421 427 100111 421− 427

001000 425 423 101000 425− 423

001001 425 421 101001 425− 421

001010 427 423 101010 427− 423

001011 427 421 101011 427− 421

001100 425 425 101100 425− 425

001101 425 427 101101 425− 427

001110 427 425 101110 427− 425

001111 427 427 101111 427− 427

010000 423 423− 110000 423− 423−

010001 423 421− 110001 423− 421−

010010 421 423− 110010 421− 423−

010011 421 421− 110011 421− 421−

010100 423 425− 110100 423− 425−

010101 423 427− 110101 423− 427−

010110 421 425− 110110 421− 425−

010111 421 427− 110111 421− 427−

011000 425 423− 111000 425− 423−

011001 425 421− 111001 425− 421−

011010 427 423− 111010 427− 423−

011011 427 421− 111011 427− 421−

011100 425 425− 111100 425− 425−

011101 425 427− 111101 425− 427−

011110 427 425− 111110 427− 425−

011111 427 427− 111111 427− 427−


TTAI.KO-06.0448 ８６

6.4.2 Pseudo-random sequence generation

Pseudo-random sequences are defined by a length-31 Gold sequence. The output

sequence )(nc of length PNM , where 1,...,1,0 PN −= Mn , is defined by

( )( )( ) 2mod)()1()2()3()31(

2mod)()3()31(2mod)()()(

22222

111

21

nxnxnxnxnxnxnxnx

NnxNnxnc CC

++++++=+++=+

+++=

where 1600=CN and the first m-sequence shall be initialized

with 30,...,2,1,0)(,1)0( 11 === nnxx . The initialization of the second m-sequence is denoted

by ∑=⋅=

30

0 2init 2)(i

iixc with the value depending on the application of the sequence.

6.5 Timing

6.5.1 Uplink-downlink frame timing

Transmission of the uplink radio frame number i from the UE shall start

soffsetTA TA )( TNN ×+ seconds before the start of the corresponding downlink radio frame

at the UE, where 12000 TA ≤≤ N . 768offsetTA =N .

Downlink radio frame i

Uplink radio frame i

( ) seconds soffsetTA TA TNN ⋅+

(Figure 6-22) Uplink-downlink timing relation


TTAI.KO-06.0448 ８７

7 Layer 2

On the 5G side, Layer 2 is split into the SWI/SPL, PDCP, RLC and MAC sublayers. This

subclause gives a high level description of the Layer 2 sub-layers on the 5G side in

terms of services and functions, focusing on the differences with the Layer 2 of LTE.

7.1 MAC Sublayer

This subclause provides an overview on services and functions provided by the MAC

sublayer on the 5G side.

7.1.1 Services and Functions

Compared to LTE, the main services and functions of the MAC sublayer on the 5G side

also include:

- Concatenation of multiple MAC SDUs belonging to one logical channel into

transport block (TB)

7.1.2 Logical Channels

7.1.2.1 Control Channels

Control channels are used for transfer of control plane information only.

The control channels offered by MAC are:

- Broadcast Control Channel (BCCH)

A downlink channel for broadcasting system control information.

7.1.2.2 Traffic Channels

Traffic channels are used for the transfer of user plane information only.

The traffic channels offered by MAC are:

- Dedicated Traffic Channel (DTCH)

A Dedicated Traffic Channel (DTCH) is a point-to-point channel, dedicated to

one UE, for the transfer of user information. A DTCH can exist in both uplink and

downlink.


TTAI.KO-06.0448 ８８

7.1.2.3 Mapping in Uplink

The figure below depicts the mapping between uplink logical channels and uplink

transport channels:

DTCH

UL-SCHRACH

UplinkLogical channels

UplinkTransport channels

(Figure 7-1) Mapping between uplink logical channels and uplink transport channels

In Uplink, the following connections between logical channels and transport channels

exist:

- DTCH can be mapped to UL-SCH

The figure below depicts the mapping between downlink logical channels and downlink

transport channels:

BCCH DTCH

BCH DL-SCH

DownlinkLogical channels

DownlinkTransport channels

(Figure 7-2) Mapping between downlink logical channels and downlink transport channels

In Downlink, the following connections between logical channels and transport

channels exist:

- BCCH can be mapped to BCH;

- DTCH can be mapped to DL-SCH;

7.1.3 PDU Structure

The MAC PDU structure supports MAC subheader with LCID length of 5 bits and 16 bit

length field for indicating length of MAC SDU.


TTAI.KO-06.0448 ８９

7.2 RLC Sublayer

This subclause provides an overview on services and functions provided by the RLC



Compared to LTE, the RLC sublayer does not include the concatenation of upper layer

PDUs.

7.2.2 PDU Structure

(Figure 7-3) below depicts the RLC PDU structure where:

- The PDU sequence number carried by the RLC header is independent of the SDU

sequence number (i.e. PDCP sequence number);

- A red dotted line indicates the occurrence of segmentation;

- Because RLC does not support concatenation and segmentation only occurs

when needed the content of an RLC PDU can generally be described by the

following relations:

1 complete SDUi; or

1 segment of SDUi .

RLC header

RLC PDU

......

n n+1RLC SDU

RLC headerRLC header

(Figure 7-3)RLC PDU Structure

7.3 PDCP Sublayer

This subclause provides an overview on services and functions provided by the PDCP



TTAI.KO-06.0448 ９０


Compared to LTE, the main services and functions of the PDCP sublayer for the user

plane include on the 5G side also include:

- Retransmission of PDCP SDUs at handover between 5G cell for RLC AM;

7.3.2 PDU Structure

(Figure 7-4) below depicts the PDCP PDU structure for user plane data, where:

- PDCP PDU and PDCP header are octet-aligned;

- PDCP header is 3 bytes long including 18bit PDCP SN.

PDCP SDUPDCP header

PDCP PDU

(Figure 7-4) PDCP PDU Structure

7.4 SWI/SPL Sublayer


The main services and functions of the SWI/SPL sublayer include:

- PDCP PDU routing for transmission between LTE and 5G;

- Support of lossless switch from LTE to 5G by sending an end marker in UL as last

PDCP SDU delivered on the LTE path.

7.4.2 PDU Structure

The SWI/SPL does not include any header to the SWI/SPL SDU, thus SWI/SPL PDU is

identical to SWI/SPL SDU.


TTAI.KO-06.0448 ９１

8 RRC

8.1 Services and Functions

On LTE side, RRC performs the same functions as in LTE (see 3GPP TS 36.300 and

TS 36.331). On 5G side, the main services and functions of the 5G RRC sublayer

include:

- Establishment, maintenance and release of a 5G RRC connection between the UE

and E-UTRAN;

- Security functions including key management;

- Establishment, configuration, maintenance and release of point to point Radio

Bearers;

- Mobility functions including 5G cell addition/release, UE measurement reporting

and control of the reporting;

- QoS management functions.

8.2 RRC protocol states & state transitions

On LTE side, no changes are brought to the RRC states and state transitions.

On 5G side, 5G RRC state machine consists of two states:

- 5G RRC_IDLE:

No PDN connection established for 5G RRC.

- 5G RRC_CONNECTED:

There is a PDN connection for 5G RRC;

Transfer of unicast data to/from UE;

At lower layers, the UE may be configured with a UE specific connected mode

DRX;

For UEs supporting CA, use of one or more SCells, aggregated with the PCell,

for increased bandwidth;

Network controlled mobility, i.e. 5G cell addition, 5G cell change, 5G cell

release, 5G Node-B handover;

The UE:

Monitors control channels associated with the shared data channel to

determine if data is scheduled for it;


TTAI.KO-06.0448 ９２

Provides channel quality and feedback information;

Perform beam management;

Performs neighbouring cell measurements and measurement reporting;

Acquires system information.

8.3 Transport of NAS messages

The transport of NAS messages relies on existing mechanisms defined for LTE.

8.4 System Information

System information on LTE side remains untouched i.e. there are no 5G related SIB

broadcast by the eNB. On 5G side, only the MIB is broadcast, SIBs are not.

8.5 Transport of 5G RRC messages

5G RRC messages are always carried as user plane data over LTE in a separate DRB,

which uses a specific QCI. The PDCP SDUs for that DRB are regular IP packets with IP

headers.


TTAI.KO-06.0448 ９３

9 5G Radio identities

The following 5G related UE identities are used at cell level:

- C-RNTI: unique identification used for identifying 5G-RRC Connection and

scheduling;

- Temporary C-RNTI: identification used for the 5G random access procedure;

- Random value for contention resolution: during some transient states, the UE is

temporarily identified with a random value used for contention resolution

purposes.

*NOTE: E-UTRAN identities defined in TS 36.300 apply to LTE.


TTAI.KO-06.0448 ９４

10 ARQ and HARQ

5G provides ARQ and HARQ functionalities. The ARQ functionality provides error

correction by retransmissions in acknowledged mode at Layer 2. The HARQ

functionality ensures delivery between peer entities at Layer 1.

10.1 HARQ principles

The HARQ within the 5G MAC sublayer has the following characteristics:

- N-process Stop-And-Wait;

- HARQ transmits and retransmits transport blocks;

- In the downlink:

Asynchronous adaptive HARQ;

Uplink ACK/NAKs in response to downlink (re)transmissions are sent on

xPUCCH or xPUSCH, which is configured by 5G RRC;

xPDCCH signals the HARQ process number and if it is a transmission or

retransmission (NDI is commonly applied to both codewords);

UL feedback time on xPUCCH is configurable by an timing information

signaled by xPDCCH , which is depended on UE capability associated with

the minimum HARQ feedback processing time on UE side;

The length of HARQ feedback reporting information is configurable by 5G

RRC signalling by 5G Node;

Retransmissions are always scheduled through xPDCCH.

- In the uplink:

Asynchronous adaptive HARQ;

Maximum number of retransmissions configured per UE (as opposed to per

radio bearer);

Downlink ACK/NAKs in response to uplink (re)transmissions are identified at

UE with NDI and HARQ process number signaled by xPDCCH i.e. there is

no explicit ACK/NACK information;

xPDCCH signals the HARQ process number and if it is a transmission or

retransmission (NDI is commonly applied to both codewords);

Retransmissions are always scheduled through xPDCCH.


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10.2 ARQ principles

The ARQ within the 5G-RLC sublayer has the following characteristics:

- ARQ retransmits 5G-RLC PDUs or 5G-RLC PDU segments based on 5G-RLC

status reports;

- Polling for 5G-RLC status report is used when needed by 5G-RLC;

- 5G-RLC receiver can also trigger 5G-RLC status report after detecting a missing

5G-RLC PDU or 5G-RLC PDU segment.


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11 Mobility

For the trial, 5G cells belong to the EPC and mobility management relies on the

procedures defined for LTE.

11.1 Intra E-UTRAN

11.1.1 Mobility Management in ECM-IDLE

11.1.1.1 General principles

The idle mode roaming principles are based on standard UE idle mode procedures

specified by 3GPP. There are impacts on the mobility management UE procedures in

ECM-IDLE i.e. the UE can only select LTE cells following existing mechanisms. The

roaming of LTE UE and P5G UE is based on the availability of the HPLMN cells for

both LTE UE and P5G UE. This allows LTE service for both LTE UE and P5G UE in LTE

cells and P5G cells.

The P5G area of the network is identified by a specific PLMN ID, the P5G Trial PLMN

ID. The idle mode roaming principle of both LTE UE and P5G UE is based on normal

UE idle mode procedures for UE that is registered to HPLMN (PLMN ID) and performs

re-selections between suitable cells as specified in 3GPP TS 36.304, clause 4.3. The

LTE cells in the P5G area broadcast both the P5G Trial PLMN ID, and the PLMN ID.

PLMN ID is broadcast in order to make all cells suitable cells for LTE UE and P5G UE.

These LTE cells in 5G coverage area are referred to as P5G cells. The LTE cells

outside of the P5G area broadcast the PLMN ID but not the P5G Trial PLMN ID. They

are referred to as non-P5G cells.

There are no Tracking Areas with mixture of LTE cells and P5G cells, hence all UEs

perform TAU upon entering or leaving the P5G area. When initiating TAU Request, all

UEs indicate PLMN ID as their selected PLMN ID in the RRC Connection Establishment.

11.1.1.2 LTE UE roaming between LTE and P5G area

Whether the LTE UE is attaching to a P5G or a non-P5G cell, the LTE UE performs a

normal attach. From then onwards, idle mode mobility is controlled by the LTE UE


TTAI.KO-06.0448 ９７

selecting suitable cells (3GPP TS 36.304) of the Registered PLMN, i.e. the KT PLMN.

Mobility from non-P5G to P5G cell is enabled, as the LTE UE considers the P5G cells

suitable cells for its cell re-selection (the network is indicating its RPLMN as one of the

two network sharing PLMNs that are available via that P5G cell).

Since the LTE UE is camping on its HPLMN cell (RPLMN = HPLMN) in P5G network, it

is also free to re-select to standalone LTE network cell.

*NOTE: Since P5G cells indicate network sharing by broadcasting both PLMN ID and

P5G Trial PLMN ID, no equivalent PLMN ID indication from the CN is needed for the

LTE UEs.

11.1.1.3 P5G UE roaming between LTE and P5G area

P5G UEs consider PLMN ID are their HPLMN. This enables cell re-selection between

P5G to non-P5G cells.

P5G UE uses the availability of P5G Trial PLMN ID as an indication of availability of 5G

service. P5G UE triggers the establishment of PDN Connection for 5G signalling based

on PLMN ID after having detected based on the advertised P5G Trial PLMN ID that it

has entered the P5Garea. If P5G UE detects that the selected cell does not broadcast

P5G Trial PLMN ID, then the UE shall release the PDN connection for 5G signalling.

11.1.2 Mobility Management in ECM-CONNECTED

The measurements of 5G cells is configured by 5G RRC and are transparent to the

eNB. The transitions from RRC_IDLE to RRC_CONNECTED are not affected by 5G RRC

and rely on LTE procedures.

11.1.2.1 Initial 5G RRC connection establishment

The initial 5G RRC connection establishment procedure is initiated by the UE via LTE

to establish a DRB for 5G RRC signalling between the UE and the 5G Node. (Figure

11-1) shows the initial 5G RRC connection establishment:


TTAI.KO-06.0448 ９８

Dedicated PDN establishment for 5G-RRC

UE eNB 5G Node S-GW/P-GW MME

2. PDN Connectivity request (APN ”5G”)

3. Create Session Request

4. Create Session Response

5. Bearer Setup Request / PDN Connectivity Accept (QCI = 5G-RRC)

6. RRCConnectionReconfiguration

7. RRCConnectionReconfigurationComplete

8. Bearer Setup Response

LTE-DRB connection available for 5G-RRC

Tunnel for 5G-RRC messages created

UE ready to Tx/Rx 5G-RRC messages

1. System Information Broadcast

9. PDN Connectivity Complete

(Figure 11-1) Initial 5G RRC connection establishment

1. The eNB provides SIB(s) via broadcast to the UE indicating the availability of

P5G Trial PLMN ID.

2. Based on the 5G PLMN ID availability, the UE initiates a PDN Connectivity

Request (APN, PDN Type, Protocol Configuration Options, Request Type)

message (see 3GPP TS 23.401, section 5.10.2). If the UE was in ECM-IDLE

mode, this NAS message is preceded by the Service Request procedure. UE

shall indicate APN “5G APN” when it requests a PDN connection for 5G RRC

connection.

3. If the UE is authorized for 5G RRC connection (according to the user

subscription), the MME allocates a Bearer Id, and sends a Create Session

Request message to the Serving GW (see 3GPP TS 23.401, section 5.10.2).

4. The Serving GW returns a Create Session Response message to the MME (see

3GPP TS 23.401, section 5.10.2).

5. The MME sends PDN Connectivity Accept (APN, PDN Type, PDN Address, EPS

Bearer Id, Session Management Request, Protocol Configuration Options)

message to the UE. This message is contained in an S1_MME control message

Bearer Setup Request (EPS Bearer QoS, UE-AMBR, PDN Connectivity Accept,

S1-TEID) to the eNB.

*NOTE: A specific QCI is assigned for EPS Bearer QoS to identify the 5G RRC

connection bearer.


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6. The eNB sends RRC Connection Reconfiguration to the UE including the PDN

Connectivity Accept message.

7. The UE sends the RRC Connection Reconfiguration Complete to the eNB.

8. The eNB send an S1-AP Bearer Setup Response to the MME. The S1-AP

message includes the TEID of the eNB and the address of the eNB used for

downlink traffic on the S1_U reference point.

9. The UE NAS layer builds a PDN Connectivity Complete message including EPS

Bearer Identity. The UE then sends a PDN Connectivity Complete to the MME.

*NOTE: Once the UE has obtained a PDN Address Information (signaled in the PDN

Connectivity Accept message), the UE can send uplink packets (5G RRC messages)

towards the eNB which will then be tunnelled to the 5G Node.

11.1.2.2 5G Cell Addition

The 5G cell addition is initiated by the 5G Node and is used to provide radio resources

from the 5G Node to the UE. This procedure is used to add at least the first 5G cell.

(Figure 11-2) shows the 5G cell addition:

UE eNB 5G Node S-GW/P-GW MME



UE searching for 5G cells/beams

6. 5GRRCConnectionReconfiguration(5GNB configuration, drb-ToAddMod, cipheringAlgorithm, etc.)7. 5GRRCConnectionReconfigurationComplete

2. UE-5GCapabilityInformation

5. 5GmeasurementReport

3. 5GRRCConnectionReconfiguration(5G measurement config)4. 5GRRCConnectionReconfigurationComplete

Decide to add 5G cell for the UE

8. Random Access Procedure

UE connected to the 5G cell

5G-RRC signalling over LTE DRB

1. UE- 5GCapabilityEnquiry

(Figure 11-2) 5G cell addition


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1. After the initial 5G RRC connection establishment procedure according to

clause 10.1.2.1, or after a subsequent RRC connection establishment where a

DRB for 5G RRC signalling is automatically configured, the 5G Node should

send UE-5GCapabilityEnquiry message via LTE DRB requesting UE capabilities

for 5G RAT.

The 5G Node shall use UE’s 5G RRC PDN connection IP address as destination

address for all 5G RRC messages but for UE-5GCapabilityEnquiry message for

which the 5G Node shall use a predefined IP address. The 5G Node uses

another predefined IP address as source address. The 5G Node encapsulates a

5G RRC message in a UDP/IP header. The 5G Node shall use UDP port number.

2. Upon receiving the UE-5GCapabilityEnquiry message from the network, the UE

shall send UE-5GCapabilityInformation message and the entire UE 5G

capabilities to 5G Node via LTE DRB.

For UE-5GCapabilityInformation and for all subsequent 5G RRC messages, the

UE shall use a predefined IP address as destination address as well as its 5G

RRC PDN connection IP address as source address. The UE encapsulates 5G

RRC message in a UDP/IP header. The UE shall use UDP port number.

*NOTE: If the 5G Node does not intend to configure 5G measurements, then it can

release any possibly existing old 5G configuration by sending an additional

RRCConnectionReconfiguration with ConfigRelease.

3. The 5G Node may initiate the 5G RRC connection reconfiguration procedure for

configuring 5G frequency layer measurements to the UE.

4. The UE applies the new configuration and replies with

5GRRCConnectionReconfigurationComplete message.

5. UE reports 5G measurement results to the 5G Node in 5GmeasurementReport

according to the measurement configuration provided in

5GRRCConnectionReconfiguration.

6. If the RRM entity in the 5G Node determines it is able to admit resources for the

UE, it allocates respective radio resources and respective transport network

resources. The 5G Node triggers Random Access so that synchronisation

towards the 5G Node radio resource configuration can be performed. The 5G

Node sends the new radio configuration to the UE in


TTAI.KO-06.0448 １０１

5GRRCConnectionReconfiguration message.

If this is the first configuration of a 5G cell, then ciphering configuration shall be

present.


5GRRCConnectionReconfigurationComplete message. In case the UE is unable

to comply with (part of) the configuration included in the

5GRRCConnectionReconfiguration message, it performs the reconfiguration

failure procedure.

8. The UE performs synchronisation towards the 5G cell.

11.1.2.3 5G Cell Change

The 5G cell change is initiated by the 5G Node and is used to change the/a 5G Cell.

(Figure 11-3) shows the 5G cell change:

UE eNB 5G Node



2. 5GRRCConnectionReconfiguration(5GNB configuration with 5G-mobilityControlInfo)3. 5GRRCConnectionReconfigurationComplete

1. 5GmeasurementReport

Decide to change 5G cell for the UE


4. Random Access Procedure (to new cell)

UE connected to the 5G cell

(Figure 11-3) 5G cell change

1. UE reports 5G measurement results to the 5G Node in 5GmeasurementReport

according to the measurement configuration provided in

5GRRCConnectionReconfiguration.

2. 5G Node generates a new radio resource configuration for the 5G cell change

and sends the 5GRRCConnectionReconfiguration message to the UE.


TTAI.KO-06.0448 １０２



4. If instructed, the UE performs synchronisation towards the 5G Cell. Otherwise,

the UE may perform UL transmission after having applied the new configuration.

11.1.2.4 5G Cell Release

The 5G cell release is initiated by the 5G Node and is used to remove 5G Cell. (Figure

11-4) shows the 5G cell change:

UE eNB 5G Node



2. 5GRRCConnectionReconfiguration(5GNB release)3. 5GRRCConnectionReconfigurationComplete

1. 5GmeasurementReport (OPTIONAL)

Decide to release 5G cell from the UE


(Figure 11-4) 5G cell release

1. UE reports the 5G measurement results to the 5G Node according to the

measurement configuration provided in 5GmeasurementReport.

*NOTE: 5G link loss (a.k.a. RLF) event in the UE may also serve as a trigger for

informing the 5G Node of the need to release the 5G cell. Furthermore, the release

of a 5G cell can also be initiated by the 5G Node directly, without any indication

coming form the UE (for instance due to load reason).

2. The 5G Node indicates in the 5GRRCConnectionReconfiguration message

towards the UE that the UE shall release the 5G cell.




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11.1.3. 5G Measurements

The UE reports measurement information in accordance with the measurement

configuration as provided by the 5G Node. 5G RRC provides the measurement

configuration applicable for a UE in 5GRRC_CONNECTED by means of dedicated

signalling, i.e. using the RRCConnectionReconfiguration message.

The measurement configuration includes the following parameters:

1. Measurement objects: the objects on which the UE shall perform the

measurements.

- A measurement object is a single 5G carrier frequency.

2. Reporting configurations: a list of reporting configurations where each reporting

configuration consists of the following:

- Reporting criterion: the criterion that triggers the UE to send a measurement

report. This can either be periodical or a single event description. Four events are

used:

Serving 5G cell becomes better than threshold;

Serving 5G cell becomes worse than threshold;

Neighbour 5G cell becomes offset better than serving 5G cell;

Neighbour 5G cell becomes better than threshold.

*NOTE: Layer 3 filtering is used.

3. Quantity: the measurement quantity for 5G carrier frequencies is RSRP.

5G RRC only configures a single measurement object for a given 5G frequency, i.e. it

is not possible to configure two or more measurement objects for the same frequency

with different associated parameters. Multiple instances of the same event can be

configured though e.g. by configuring two reporting configurations with different

thresholds.

11.1.4 Radio Link Failure in 5G


TTAI.KO-06.0448 １０４

Only one phase governs the behaviour associated to 5G radio link failure as shown on

(Figure 11-5)

- 5G RLF handling procedure:

started upon radio problem detection which can be indicated from the lower

layer by considering beam measurement results;

leads to radio link failure detection;

no UE-based mobility;

based on timer or other (e.g. counting) criteria (T1).

normal operationradio

problem detection

no recovery during T1

radio link failure

5G RRC_CONNECTED

5G RLF handling procedure

(Figure 11-5) 5G Radio Link Failure

After declaring RLF, the UE sends the 5G Measurement Report to the 5G Node through

eNB. Once 5G Node receives this MR message it can decide for 5G UE to release the

5G cell.

11.2 Inter RAT

Inter-RAT mobility is assumed to rely on existing LTE procedures, without any impacts.


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12 Scheduling and Rate Control

In order to utilise the xSCH resources efficiently, a scheduling function is used in MAC.

In this subclause, an overview of the scheduler for the transmission over 5G radio

interface is given in terms of scheduler operation, signalling of scheduler decisions,

and measurements to support scheduler operation. An overview of the scheduler

defined in TS 36.300 is applied for LTE radio interface.

Compared to LTE following features are not supported:

- Scheduling of SL-SCH;

- Cross-carrier scheduling when CA is configured;

- Carrier activation/deactivation when CA is configured. (*Note: All configured CC

are considered as active.);

- Prioritized bit rate;

- Explicit Congestion Notification.

If not otherwise defined in following subclauses, the subclause 11 in TS 36.300

applies for 5G scheduling operation.

12.1 Basic Scheduler Operation

MAC in 5G-Node includes dynamic resource schedulers that allocate physical layer

resources for the DL-SCH, and UL-SCH transport channels. Different schedulers

operate for the DL-SCH, and UL-SCH.

The scheduler should take account of the traffic volume and the QoS requirements of

each UE and associated radio bearers, when sharing resources between UEs. Only

"per UE" grants are used to grant the right to transmit on the UL-SCH (i.e. there are no

"per UE per RB" grants).

Schedulers may assign resources taking account the radio conditions at the UE

identified through measurements made at the 5G-Node and/or reported by the UE.

Radio resource allocations can be valid for one or multiple TTIs.

Resource assignment consists of physical resource blocks (PRB) and MCS.

When CA is configured, a UE may be scheduled over multiple serving cells

simultaneously but at most one random access procedure shall be ongoing at any time.

A linking between UL and DL allows identifying the serving cell for which the DL

assignment or UL grant applies as follows:


TTAI.KO-06.0448 １０６

- DL assignment received on PCell corresponds to downlink transmission on PCell;

- UL grant received on PCell corresponds to uplink transmission on PCell;

- DL assignment received on SCelln corresponds to downlink transmission on

SCelln;

- UL grant received on SCelln corresponds to uplink transmission on SCelln. If

SCelln is not configured for uplink usage by the UE, the grant is ignored by the

UE.

12.1.1 Downlink Scheduling

In the downlink, 5G-Node can dynamically allocate resources (PRBs and MCS) to UEs

at each TTI via the C-RNTI on xPDCCH(s). A UE always monitors the xPDCCH(s) in

order to find possible allocation when its downlink reception is enabled (activity

governed by DRX when configured). When CA is configured, the same C-RNTI applies

to all serving cells.

Compared to LTE, semi-persistent scheduling is not supported in DL.

When required, retransmissions are explicitly signaled via the xPDCCH(s).

12.1.2 Uplink Scheduling

In the uplink, 5G-Node can dynamically allocate resources (PRBs and MCS) to UEs at

each TTI via the C-RNTI on xPDCCH(s). A UE always monitors the xPDCCH(s) in order

to find possible allocation for uplink transmission when its downlink reception is

enabled (activity governed by DRX when configured). When CA is configured, the

same C-RNTI applies to all serving cells.

Compared to LTE, semi-persistent scheduling is not supported in UL.

When required, retransmissions are explicitly signaled via the xPDCCH(s).

12.2 Measurements to Support Scheduler Operation

Measurement reports are required to enable the scheduler to operate in both uplink

and downlink. These include transport volume and measurements of a UEs radio

environment.

Compared to LTE single BSR format is supported in 5G.


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12.3 Rate Control of GBR, MBR and UE-AMBR

12.3.1 Downlink

The 5G-Node guarantees the downlink GBR associated with a GBR bearer, enforces

the downlink MBR associated with a GBR bearer and enforces the downlink AMBR

associated with a group of Non-GBR bearers.

12.3.2 Uplink

The UE has an uplink rate control function which manages the sharing of uplink

resources between radio bearers.

Compared to LTE the prioritized bit rate (PBR) is not supported.

The uplink rate control function ensures that the UE serves its radio bearer(s) in

following manner:

- All the radio bearer(s) in decreasing priority order for the remaining resources

assigned by the grant.

*NOTE: By limiting the total grant to the UE, the 5G-Node can ensure that the UE-

AMBR plus the sum of MBRs is not exceeded.

*NOTE: Provided the higher layers are responsive to congestion indications, the 5G-

Node can enforce the MBR of an uplink radio bearer by triggering congestion

indications towards higher layers and by shaping the data rate towards the S1

interface.

If more than one radio bearer has the same priority, the UE shall serve these radio

bearers equally.

12.3.3 UE-AMBR for Dual Connectivity between LTE and 5G

In DC IW operation with LTE, the LTE eNB ensures that the UE-AMBR is not exceeded

by:

1) limiting the resources it allocates to the UE in LTE cell(s); and

2) indicating to the 5G-Node a limit so that the 5G-Node can also in turn guarantee


TTAI.KO-06.0448 １０８

that this limit is not exceeded.

12.4 CSI reporting for Scheduling

The time and frequency resources used by the UE to report CSI are under the control

of the 5G-Node. Compared to LTE only aperiodic CSI reporting is supported. A UE

shall send the CSI report based on DCI format that indicates to include CSI report in

UCI scheduled for uplink transmission.

A UE is not expected to receive more than one CSI report request for a given subframe.

12.5 Explicit Congestion Notification

Compared to LTE explicit congestion notification is not supported in 5G.


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13 DRX

There are no specific requirements on LTE DRX in P5G Trial. Normal 3GPP DRX

requirements apply.

Due to the selected architecture, RRC Idle Mode DRX shall not be used in 5G in P5G

Trial.

RRC Connected mode DRX specified for LTE in 3GPP TS 36.300 may be used also in

5G in P5G Trial.

Extended DRX (eDRX) shall not be used in P5G Trial.


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14 QoS

The same QoS framework as in LTE is used for the PyeongChang 5G trial.

On 5G side, a specific QCI is assigned to identify the radio bearer used for 5G RRC

signaling.


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15 Security

15.1 Overview and Principles

The following principles apply to 5G RAN security:

- The ciphering for 5G AS protection is a mandatory feature where only AES is

considered as the ciphering algorithm (no integrity support for 5G AS protection).

- The 5G AS key (5G KeNB) is derived at the 5G Node and delivered to the UE only

via encrypted links (i.e., 4G DRB for 5G RRC signalling).

- The 5G KeNB keys are cryptographically independent from the 4G KeNB keys.

- Whenever a 5G cell change takes place, 5G KeNB is derived at the target 5G cell

and delivered to the UE.

- 5G KeNB needs to be refreshed whenever PDCP COUNTs are about to wrap

around.

The key derivation is depicted on (Figure 15-1) below, where:

- 5G-RAND is a 256bits random value used as input into the 5G KeNB derivations.

- 5G-C value is a 64 bit counter used as freshness input into the 5G KeNB

derivations.

- 5G KUPenc is a key, which shall only be used for the protection of 5G UP traffic

with a AES encryption algorithm. This key is derived by the UE and the 5G Node

from 5G KeNB, as well as an identifier for the encryption algorithm (UP-enc-alg,

Alg-ID).

*NOTE: 5G-RAND and 5G-C value are never delivered to the UE.

KDF

5G-RAND

5G-C value

5G Node

UP-enc-alg, Alg-ID

5G Node/UE

KDF

5G KUPenc

Trunc

128

256

5G KUPenc

5G KeNB256

(Figure 15-1) 5G Key Derivation


TTAI.KO-06.0448 １１２

5G UP keys are refreshed when PDCP COUNTs are about to wrap around. 5G KeNB* is

newly derived by 5G Node from the current "5G- C value" and delivered to UE via 5G

RRC signaling. 5G KeNB* is then used as new 5G KeNB for 5G UP traffic. When the UE

goes into 5G RRC-IDLE all keys are deleted from the 5G Node.

5G UP keys are updated at 5G cell change by indicating in 5G RRC signaling to the UE

the value of the new 5G KeNB generated at new 5G cell.

15.2 Security termination points

The table below describes the security termination points.

<Table 15-1> Security Termination Points

Ciphering Integrity

Protection

5G U-Plane Data Required and terminated in

5G Node

Not Required

(NOTE)

*NOTE: Integrity protection for 5G U-Plane is not required.

15.3 5G Cell Removal

At 5G cell removal, the 5G cell shall delete the keys it stores. It is also assumed that

5G cell does no longer store state information about the corresponding UE and deletes

the current keys from its memory. In particular, at 5G cell removal:

- The 5G cell and UE delete 5G KeNB and 5G KUPenc.


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16 Radio Resource Management aspects

The main functions of, and high level guidelines for Radio Resource Management as

described in 3GPP TS 36.300 also apply to the P5G trial system:

- Radio Bearer Control (RBC): the establishment, maintenance and release of

Radio Bearers involve the configuration of radio resources associated with them.

When setting up a radio bearer for a service, radio bearer control (RBC) takes

into account the overall resource situation, the QoS requirements of in-progress

sessions and the QoS requirement for the new service. RBC is also concerned

with the maintenance of radio bearers of in-progress sessions at the change of

the radio resource situation due to mobility or other reasons. RBC is involved in

the release of radio resources associated with radio bearers at session

termination, handover or at other occasions.

- Radio Admission Control (RAC): the task of radio admission control is to admit or

reject the establishment requests for new radio bearers. In order to do this, RAC

takes into account the overall resource situation, the QoS requirements, the

priority levels and the provided QoS of in-progress sessions and the QoS

requirement of the new radio bearer request. The goal of RAC is to ensure high

radio resource utilization (by accepting radio bearer requests as long as radio

resources available) and at the same time to ensure proper QoS for in-progress

sessions (by rejecting radio bearer requests when they cannot be

accommodated).

- Connection Mobility Control (CMC): connection mobility control is concerned with

the management of radio resources in connection with idle or connected mode

mobility. In idle mode, the cell reselection algorithms are controlled by setting of

parameters (thresholds and hysteresis values) that define the best cell and/or

determine when the UE should select a new LTE cell. Also, E-UTRAN parameters

that configure the UE measurement and reporting procedures are broadcast. In

connected mode, the mobility of radio connections has to be supported. LTE

handover decisions may be based on UE and eNB measurements, and 5G cell

addition, change and release decisions may be based on UE and 5G Node

measurements. In addition, LTE handover decisions and 5G cell addition, change

and release decisions may take other inputs, such as neighbour cell load, traffic

distribution, transport and hardware resources and Operator defined policies into


TTAI.KO-06.0448 １１４

account.

- Dynamic Resource Allocation (DRA): the task of dynamic resource allocation is to

allocate and de-allocate resources to user and control plane packets. DRA

involves several sub-tasks, including the selection of radio bearers whose

packets are to be scheduled and managing the necessary resources (e.g. the

power levels or the specific resource blocks used). DRA typically takes into

account the QoS requirements associated with the radio bearers, the channel

quality information for UEs, buffer status, interference situation, etc. DRA may

also take into account restrictions or preferences on some of the available

resource blocks or resource block sets due to inter-cell interference coordination

considerations.


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17 UE capabilities

The 5G RRC signalling carries the 5G capabilities. Compared to LTE, the UE 5G

capability information is not stored in the MME. The UE provides the 5G capabilities

including the IMEI-SV value of the 5G UE at the 5G RRC UE capability enquiry

procedure.

Signalling of any other RAT capabilities in the 5G RRC is not supported.

The 5G Node may acquire the UE capabilities when necessary.


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18 S1 Interface

There are no specific requirements on S1 in P5G Trial. 3GPP specification 3GPP TS

36.300 and 3GPP TS 36.410 [x] apply also in P5G Trial.

S1 termination points are MME and LTE eNB.

*NOTE: It is assumed that EPC core network is used for the Trial.


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19 X2 Interface

X2 interface in P5G Trial follows standard 3GPP procedures as described in 3GPP TS

36.300 .

In order to support the agreed functionalities for P5G, X2 between an eNB and a 5G

Node needs to be enhanced to support at least the following:

- 5G RRC DRB Establishment indication from eNB to 5G Node to trigger UE-

5GcapabilityEnquiry (see section 10.1.2.2);

- Relay of the UE’s end marker from eNB to 5G Node for in-sequence delivery in

uplink during path switch from LTE to 5G;

- Indication of empty transmission buffers from eNB to 5G Node for in-sequence

delivery in downlink during path switch from LTE to 5G.


TTAI.KO-06.0448 １１８

부 록 Ⅰ-1

(본 부록은 표준을 보충하기 위한 내용으로 표준의 일부는 아님)

지식재산권 확약서 정보

Ⅰ-1.1 지식재산권 확약서


※ 상기 기재된 지식재산권 확약서 이외에도 본 표준이 발간된 후 접수된 확약서가 있을 수

있으니, TTA 웹사이트에서 확인하시기 바랍니다.


TTAI.KO-06.0448 １１９

부 록 Ⅰ-2


시험인증 관련 사항

Ⅰ-2.1 시험인증 대상 여부


Ⅰ-2.2 시험표준 제정 현황



TTAI.KO-06.0448 １２０

부 록 Ⅰ-3


본 표준의 연계(family) 표준



TTAI.KO-06.0448 １２１

부 록 Ⅰ-4


참고 문헌

[1] 3GPP TS 36.300 "Evolved Universal Terrestrial Radio Access (E-UTRA) and Evolved

Universal Terrestrial Radio Access Network (E-UTRAN); Overall description; Stage 2"

[2] 3GPP TS 36.211 "Evolved Universal Terrestrial Radio Access (E-UTRA); Physical

channels and modulation"

[3] TS 5G.201 V1.0 "5G Radio Access (5G RA); Physical layer; General description

"(Available at http://www.kt.com/biz/kt5g_02.jsp )

[4] TS 5G.211 V2.6 "5G Radio Access (5G RA); Physical channels and modulation"".

(Available at http://www.kt.com/biz/kt5g_02.jsp )

[5] TS 5G.212 V2.3 "5G Radio Access (5G RA); Multiplexing and channel coding"".

(Available at http://www.kt.com/biz/kt5g_02.jsp )

[6] TS 5G.213 V1.9 "5G Radio Access (5G RA); Physical layer procedures"". (Available at

http://www.kt.com/biz/kt5g_02.jsp )

[7] TS 5G.214 V1.1 "5G Radio Access (5G RA); Physical layer – Measurements" (Available

at http://www.kt.com/biz/kt5g_02.jsp )

[8] TS 5G.321 V1.2 "5G Radio Access (5G RA); Medium Access Control (MAC) protocol

specification" (Available at http://www.kt.com/biz/kt5g_02.jsp )

[9] TS 5G.322 V1.1" 5G Radio Access (5G RA); Radio Link Control (RLC) protocol

specification" (Available at http://www.kt.com/biz/kt5g_02.jsp )

[10] TS 5G.323 V1.0 "5G Radio Access (5G RA); Packet Data Convergence Protocol

(PDCP) Specification" (Available at http://www.kt.com/biz/kt5g_02.jsp )

[11] TS 5G.331 V1.0 “5G Radio Access (5G RA); 5G Radio Resource Control (5G-RRC)

Protocol Specification” (Available at http://www.kt.com/biz/kt5g_02.jsp )

[12] TS 5G.300 V1.1 "5G Radio Access (5G RA); Overall description; Stage 2" (Available at

http://www.kt.com/biz/kt5g_02.jsp )

http://www.kt.com/biz/kt5g_02.jsp











TTAI.KO-06.0448 １２２

부 록 Ⅰ-5


영문표준 해설서

1 Scope

본 절에서는 본 규격의 기술 영역을 정의한다.

2 References

본 규격에서 참고하는 기술 문서를 정의한다.

3 Definitions

본 문서에 사용되는 용어를 정의한다.

4 Abbreviations

본 문서에 사용되는 약어를 정의한다.

5 Overall architecture

평창 올림픽 5G 서비스를 지원하기 위한 무선 시스템 구조를 정의한다.

6 Physical Layer for 5G

평창 올림픽 5G 서비스를 지원하기 위한 물리 규격을 설명한다.

7 Layer 2

평창 올림픽 5G 서비스를 지원하기 위한 layer 2 절차를 설명한다.

8 RRC


TTAI.KO-06.0448 １２３

평창 올림픽 5G 서비스를 지원하기 위한 RRC 방식을 정의한다.

9 5G Radio identities

평창 올림픽 5G 서비스를 지원하기 위한 5G Radio identities를 정의한다.

10 ARQ and HARQ

평창 올림픽 5G 서비스를 지원하기 위한 ARQ and HARQ 방식을 정의한다.

11 Mobility

평창 올림픽 5G 서비스를 지원하기 위한 이동성 보장 방식을 정의한다.

12 Scheduling and Rate Control

평창 올림픽 5G 서비스를 지원하기 위한 스케줄링 및 데이터 제어 방식을 정의한다.

13 DRX

평창 올림픽 5G 서비스를 지원하기 위한 DRX 방식을 정의한다.

14 QoS

평창 올림픽 5G 서비스를 지원하기 위한 QoS 보장 방식을 정의한다.

15 Security

평창 올림픽 5G 서비스를 지원하기 위한 Security 보장 방식을 정의한다.

16 Radio Resource Management aspects

평창 올림픽 5G 서비스를 지원하기 위한 무선자원 관리 방식을 정의한다.


TTAI.KO-06.0448 １２４

17 UE capabilities

평창 올림픽 5G 서비스를 지원하기 위한 UE capabilities를 정의한다.

18 S1 Interface

평창 올림픽 5G 서비스를 지원하기 위한 S1 Interface를 정의한다.

19 X2 Interface

평창 올림픽 5G 서비스를 지원하기 위한 X2 Interface를 정의한다.


TTAI.KO-06.0448 １２５

부 록 Ⅰ-6


표준의 이력

판수 채택일 표준번호 내용 담당 위원회

제1판 2017.06.28 제정

TTAI.KO-06.0448

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