1999. 1. 현대전자 정보통신연구소 atm 기술을 이용한 차세대 이동통신망...

1999. 1.

현대전자 정보통신연구소

ATM 기술을 이용한 차세대이동통신망 구축방안

ATM 기술을 이용한 차세대이동통신망 구축방안

작성자 : 이 헌 , 권수영

CONENTSCONENTS

• Wireless Service Evolution

• IMT-2000 System(1-4)

• IMT-2000 Network Evolution Scenario(1-2)

• AAL Type2 RNC in IMT-2000

• AAL Type2 Structure

• AAL Type2 Multiplexing (example)

• RAN Example

• Future Mobile Network Architecture

• Network Example

• Full ATM Network for IMT-2000(1-2)

• Access Environment for Wireless ATM

• Conclusions

Wireless Service EvolutionWireless Service Evolution

Service/System Narrow Band Wideband Broadband

Low SpeedCircuit-switched

Yes Yes Yes

Packet data Limited Yes Yes

Multimedia No Limited Yes

System PCS/DCNIMT-2000

(3G,UMTS)

WIRELESS-ATM(MBS,IMT-2000

Phase 2)

Next Generation Wireless Service

IMT-2000 System(1)IMT-2000 System(1)

• Basic Requirement

: the extension of today’s mobility services to handle multimedia and broadband services

• ISDN Service (Voice, Data, Image, Up to 2Mbps)

• Mobility (Roaming)

• Mobility Specific Service

Basic Service


초 기 현 재

표준화 측면- ITU 주도의 단일 표준 추구

- 일본, 유럽, 북미 방안 대립

- 복수 표준 인정(ITU-T의 Familyconcept, ITU-R의 set of SRTTconcept)

- 3GPP/3GPP2의 대립

- 단일 표준화 노력 진행

서비스 측면- 2세대 이동통신과 차별화

- 소비자의 요구에 따른 단계적 접근방식

- Backward Compatibility 중요시

망 및 시스템 측면- 새로운 망 시스템 구축

- Revolution의 대립

- 기존 인프라의 활용 및 BackwardCompatibilty

- Evolution 개념

Trends


CDMA(PCS/Cellular)

W-CDMA

CDMA(IMT-2000)

Multi-code CDMAMulti-carrier CDMA

Multi-PG CDMA

High DataRate

Variable

Data Rate

Trends


Parameter /Project 미 국 유 럽 일 본

Cell 동기 Sync Async Async

Spreading Code Long Code Short Code Long Code

Bandwidth 1.25/5/10/15/20 5/10/15/20 5/10/15/20

W-CDMAMulti-Carrier(Multi-Code)

Multi-Code Multi-Code

Standardization

IMT-2000 Network Evolution Scenario(1)IMT-2000 Network Evolution Scenario(1)

IS-95/95A IS-95/95A

GSM GSM

PDC PDC

cdma2000 Family A cdma2000 Family A

UMTS Family B

UMTS Family B

IS-95B/C IS-95B/C

GSM+ GSM+

IMT-2000 Global Service

2 세대 2 세대 2.5 세대 2.5 세대 3 세대 3 세대 ................ Long Term Long Term

Additional Time Slot within existing 200Khz channel

Variable rate code within 1.25Mhz channel

Higher Modulation and additional time slot within 200Khz channel

Variable rate code within 1.25Mhz(5Mhz?) channel

WCDMA for high rate and GSM for low rate

Variable Rate code within 5/20 Mhz channel

2G +(64kbps) 2G ++(144/384kbps)3G

GSM / WCDMA

CDMAOne

2.5G


초기 Revolution 개념에서 Evolution 개념으로 전환

Backward Compatibility 중시

2G 에서 3G 로의 migration 을 위한 network 개념 강조

ATM capability 중시


B TS

Transcoer

B TS

E 1 2M bps

E 1 2M bps

G P R S S upportN ode

B S C

E 1 2M bps

ATM

M S C

Evolution step 1


Evolution step 2

B TS

Transcoer

B TS

E 1 2M bps

E 1 2M bps


B S C

ATM

M S C

ATM


Evolution step 3

Transcoer

ATM

M S CF unction


ATM/ NNI

ATMSwitch

F ixed N etworkS ubscriber

B TS

B TS

E 1 2M bps

E 1 2M bps

B S C

AAL Type2 RNC in IMT-2000AAL Type2 RNC in IMT-2000

Compare AAL1 vs. AAL2

AAL1 AAL2

● Only a single user of the AAL ● Bandwidth efficiency

can be supported ● Support for compression and

● Reducing delay requies significat silence suppression

additional bandwith ● Support for idle voice channel

● Voice is always 64K or bundles of ● Multiple user channel with varying

64K (N x 64) bandwidth on a single ATM

● CBR ATM traffic class connection

● Transfer of timing information ● VBR ATM traffic class

between source and destination

● Transfer of structure information

between source and destination

AAL Type2 StructureAAL Type2 Structure

Short cell

Short cell header3octets

CID: 8bits LI:6bits 2bits(00) UUI:3bits HEC: 5bits

페이로드 길이(0-63)

User-to-User Indicator000:single short cell001:head, continue010:continue, tail011:continue,continue

OSF:6bits SN:1bit P:1bit

Start field 1octet

생성 다항식 =X5 + X2 + 1

Offset Field:Short셀 시작위치 표시

프레임 순서:0또는 1

패러티

......

Short cell

ATMHeader5octets

Payload ( 48 octets)

SAR

ATM

CPS Packet

CPS-INFO1 to 45/64 octets

CPS-PDU

AAL Type2 Multiplexing (example)AAL Type2 Multiplexing (example)

45 octets 19 octets 45 octets 19 octets 44 octets 38 octets 38 octets

CPS SDU

C P S - P acket

C P S - P DU

ATM-PDU

Cell Payload

C P S - P acket H eader

C P S - P DU H eader(S TF )

C P S - S DU Information

P AD F ield

ATM C ell H eader ATM - P DU = cell

RAN ExampleRAN Example

BSC

AT MI/F

B TS MSCAT M Sw itchDistribution

&Vocoder

ATM ATM ATM ATM

Contro llerATM

(AAL- 2)

Future Mobile Network ArchitectureFuture Mobile Network Architecture

UIM

UIM

MobileTE

MobileTE

MobileTE

MobileTE

Terminal Equipment Domain Access Network DomainCore Transport Networks

Domain(including intelligence)

ApplicationServices Domain

AccessNetworks

Examples:GSM BSSDECTS-PCNISDNB-ISDNUMTSLANWANCATVMBS

Core TransportNetworks

Examples:GSM NSS++INISDN (IN based)B-ISDN (IN based)B-ISDN (TINA based)TCP/IP based

Network ExampleNetwork Example

PCS/Cellular(2nd Generation RAS)

IMT-2000(3rd Generation RAS)

Wireless ATM (Future RAS)

LEMSCP

Generic Interface

CSS : Cell Site SwitchIWF : Interworking FunctionLE : Local ExchangeTA : Terminal AdderMSCP : Mobile Service Control Point

IWF

MSC

BSC

BTS

Terminal

BS

TransceiverTransceiver

UNI

TAATM

Terminal

CSS

BTS

Terminal

BTS BTS

Full ATM Network for IMT-2000(1)Full ATM Network for IMT-2000(1)

2nd G enB TS

Transcoer

2nd G enB S C

F unction

3rd G enB TS

2nd G enB TS

E 1 2M bps

E 1 2M bps

ATM

3nd G enF unction

ATM

3nd G enF unction

M S CF unction

G P R S S upportN ode U P T F unction/

P ersonal M obility

ATM/ NNI

ATMSwitch


GPRS : General Packet Radio ServiceUPT : Universal Personal Telecommunication

Full ATM Network for IMT-2000(2)Full ATM Network for IMT-2000(2)

2nd G enB TS

Transcoer

R adioR esource

3rd G enB TS

2nd G enB TS

E 1 2M bps

E 1 2M bps

ATM

ATM

M obilityC allC ontro l


ATM/ NNI

ATMSwitch


N ew 2nd G enB TS

ATM

H nadover

AIR Interface

U P T

Access Environment for Wireless ATM Access Environment for Wireless ATM

MT

Cellularmobile

broadband

RAS

BSC B

RAS

BSC B

Wireless residential

BS BBSC BMT

Cellularmobile

broadband

BS BMT BSC B

BSC BPMPTrx

Fixedterminal

B-ISDN

BS BBSC BMT

BS BBSC BMT

MTAMS

Wireless LAN

AMS

MT = Mobile terminalBS = Base stationPMP = Point to pointTrx = TransceiverBSC = Base station controllerRAS = Radio access systemAMS = ATM mobility server

BS B

• 무선 및 이동통신 수요의 증가• 멀티미디어 응용 서비스 제공을 위한 무선

플랫폼의 필요• 무선 사용자들의 ATM 망에 대한 접속 요구 증대

Wireless ATM 필요성

IMT-2000 에서 ATM 적용은 다음과 같다 . First Stage : RAN 에 ATM 기술 적용 Second Stage : CN 에 ATM 기술 적용

Mobility services to handle multimedia and broadband services increasing the need of wireless access to ATM network

Wireless ATM 은 다양한 형태로 구축 될 것으로 예상되나 아직은 풀어야 할 기술적인 문제가 다음과 같이 있다 .

Wireless ATM 의 Radio access Interface technique Mobility control technique to mobile terminals

ConclusionsConclusions

1999. 1. 현대전자 정보통신연구소 atm 기술을 이용한 차세대 이동통신망...

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