umts multi carrier strategy training

HUAWEI TECHNOLOGIES CO., LTD.

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Huawei Confidential

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Multi-Carrier Strategy Training

HSDPA性能研究与华为解决方案汇报

Key feature

Cases

Strategy and Pros vs Cons

Evaluation

Introduction

2

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Introduction

• Background: Remark: Multi-carrier strategy also include multi-band situation, such as

U900+U2100.

With the steady growth of radio services especially the data services,

operators need to expand the capacity of the live network and add

more carriers are one of the choices. Currently multi-band and multi-

carrier networking has become a main scenario for lots of operator’s live

networks.

According to the analysis of the operators requirements we classify them

into two categories and they are Prefer system capacity and Prefer

voice quality.

Deploying different strategies will meet different operator’s requirements in

different scenarios

274 389

621

911

1221

1501

• Strategy content：

Camping

Policy Mobility

Policy

Access

Policy Load

Balance

Policy

Status

Transition

HSPA+

Multi-Carrier Strategy

Neighboring

Cell Manage Algorithm

Switch

SPG

Setting


Access policy feature – DRD - Directed Retry Decision

• In RAN11.0 and earlier versions, DRD is implemented based on blind handover (that is, the cell signal quality

meets certain threshold, but not to measure the target cell).

• In RAN12.0, the original DRD algorithm implementation is kept, and measurement-based DRD algorithm is

added (that is, to measure signals of the target cell).

=> Improve the performance and successful of DRD access procedure, increase the delay

Measurement-based DRD or DRD of blind handover is based on parameters configuration and currently

measurement-based DRD is closed by default.

DRD Cells

Capability Matching

between Cells and UE

Cell selection based

on Service Steering

Cell selection

based on Load

Step1: Generates a list of candidate

DRD-supportive inter-frequency

cells with RAB DRD Conditions

Step2: Get the Technical

Priority of the DRD Cells

by MIMO_64QAMorDC-

HSDPA and

MIMOor64QAM.

Step3: The HSDPA Steering

Cell will be selected.

Step4: The DC Group will be decided by comparing the DL Load

between the DC Groups.

And the Anchor Carrier will be selected based on the UL Load of the

2 carriers belonging to the DC Group.

Priority

Take DC service as an example

DRD: Directed Retry Decision DRD feature For

access procedure

RAB Setup procedure Combine UE and cell Technology priority

If Technology Priority and Cell

priority are same

RAN12


Load balance policy feature – LDR

When the usage of cell resource exceeds the basic congestion triggering threshold, the cell enters the basic congestion

state. In this case, Load Reshuffling (LDR) is required to reduce the cell load and increase the access success rate.

The RNC adopts the following behaviors until the congestion be removed:

– Inter-frequency load handover

– BE rate reduction

– CS/PS inter-RAT handover

– AMR rate reduction

– QoS Renegotiation for

Uncontrollable Real-Time Services

– code reshuffling

Re

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/DL

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LDR Actions

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Power

UL DCH √ √ √ √ √ √

HSUPA √ √

DL

DCH √ √ √ √ √* √

HSDPA √ √

DC-HSDPA √ √

Iub

UL DCH √ √ √

HSUPA √

DL DCH √ √ √

HSDPA √

Code

– –

DL DCH √ √ √

HSDPA

Credit

UL DCH √ √ √ √

HSUPA √ √

DL DCH √ √ √ √

HSDPA

LDR actions intended for different resources

Remarks：

If the downlink power–based admission

uses the ENU algorithm, the basic

congestion can also be caused by the

ENU. In this situation, LDR actions do not

involve AMR rate reduction or MBMS

power reduction, as indicated by the

symbol “*” in the table.

LDR in connected mode


UE Restriction( Refer to 3GPP 25.133)

– UE can only measure 2 inter-frequency only for both

idle mode and connected mode in 3G

– UE can only measure 3 inter-frequency 3G frequency

in GSM

More frequency => Many frequency was introduced in the network

=> but there UE restrictions according to 3GPP


Strategy - Preferred Camping

1.Idle Users camp on F1 carrier

2.Through setting SPG, R99 directly establish on F1

3.Through setting SPG, H services establish on F2 preferentially

4.Allow intra-frequency handover based on coverage for all carriers

5.Configure blind handover neighboring cell between F1<-->F2

6.Allow bi-directional inter-freq HHO based on LDR between F1 and F2

7.Configure one way handover based on coverage from F2 to F1 but F1 to F2 are not allowed

R99+HSPA R99+HSPA R99+HSPA

HSPA+R99 HSPA+R99

F1

F2

SHO

HHO

Blind HO

R99+HSPA

Camping

Load Balancing

Coverage HO

DRD (f1 => f2) and LDR (F1 <=> F2)


Strategy - Random Camping

1.Idle User randomly camp on F1 or F2 carrier

2.R99 directly establish on each carrier that the user camp on

3.HSPA services DRD based on HSPA user number balanced

4.Allow intra-frequency handover based on coverage for all carriers

5.Configure blind handover neighboring cell between F1<-->F2

6.Allow bi-directional inter-freq HHO based on LDR between F1 and F2

7.Configure one way handover based on coverage from F2 to F1 but F1 to F2 are not allowed

R99+HSPA R99+HSPA R99+HSPA

R99+HSPA R99+HSPA

F1

F2

SHO

HHO

Blind HO

R99+HSPA

Camping

Every users can access to every carriers randomly depending on signal quality


Resources on different carriers may not be

used equally

Due to HSPA carrier’s high load as well as

the DRD, the HSPA setup success ratio may

be deteriorated

Strategy - Pros vs Cons

Cons

AMR and HSPA services are on the same

carriers, the AMR KPI may be deteriorated

AMR and HSPA are separate on different

carriers, the AMR experience will be

guaranteed as much as possible

The AMR carrier load will be relatively low

and the drive test for high signal quality and

coverage will be guaranteed as

much as possible

AMR are basic service for WCDMA. Some operators pay special attention on AMR in order to

satisfy these requirement (Prefer voice quality), HW suggests to use “Preferred Camping

Strategy”.

As the rapid growing of data service, system capacity become much more important than ever

before, in order to help operator to improve HSPA experience (Prefer system capacity) ,

HW suggests to use “Random Camping Strategy”

Co

nc

lus

ion

High system capacity, high carrier efficiency

Less DRD for HSPA, the HSPA RAB setup

success ratio will be guaranteed as much as

possible

As all carriers are used for HSPA, HSPA

experience may be better

Preferred

Camping

Random

Camping

Pros


HSDPA Strategy Evaluation– How to use tool

• Network audit tool Omstar Start UMTS_NetworkAudit

Choose items as below to analyze network strategy and corresponding KPIs

• Refer to the following document to see how to use UMTS_NetworkAudit :

- 《UMTS Network Evaluation Tool User Guide》-


Evaluation– OMSTAR Result to analysis

• According to the NodeB number,

provide Top10 Strategy and as well

as it’s pros and cons

• Provide KPI for each carrier

• Provide each NodeB’s strategy


Case 1 – Strategy analysis using tool example(1)

• Conclusion:

• 94.2% NodeB deploy Random Camping Strategy

• 5.8% NodeB deploy Preferred Camping Strategy

• Why are there so many different strategy? Are they right?


Case 1 – Strategy analysis using tool example(2)

• Remark: all the above KPIs are calculated by each cell

• Conclusion:

• F1/F2/F3/F4’s traffic are almost equal and this is reasonable for

Random Camping Strategy

• F5’s deployed in suburb and it’s traffic is lower than other carrier

• Why are there so many different strategy? Are they right?


Case 2 – Strategy Adjust Example

1. In order to improve coverage and signal quality (voice quality) , operator x

adjust it’s network strategy from random camping to preferred camping

2. As expected its drive signal quality improves 1.7% (EcNo>-12dB), AMR call

drop rate reduces 0.05% but PS RAB setup success ratio deteriorates 0.46%

and PS DL throughput reduces 7%


HSPA+R99

HSPA+R99 HSPA+R99 HSPA+R99

HSPA+R99 HSPA+R99

Mobility Policy

Allow intra-frequency handover based on coverage for all

carriers(ADD UINTRAFREQNCELL)

Configure one way handover based on coverage from F4 to

F3/F2 and from F3 to F2 (ADD UINTERFREQNCELL)

Configure blind handover neighboring cell between F1<-->F2;

F1,F2-->F3; F1, F2-->F4 (ADD UINTERFREQNCELL :

BlindHOFlag=TRUE)

Configure GSM as neighboring cell for all cells, only configure

F1 and F2 as neighboring cell for GSM.

HSPA+R99

HSPA+R99

F1

F2

F3

F4

HSPA+R99

SHO

HHO

Blind HO

Requirement: Prefer System Capacity

Recommend Strategy: Random Camping

Case 3 – Strategy Configuration Example

Camping Policy

Camp on F1 and F2 randomly

Access and Load Balance Policy

All carriers support HSPA and R99

Non H service are directly established in the cell

where the UE camp on

H service are established on F1/F2/F3/F4 through

load balance

LDR policy set as default

HSPA+

Use F3 and F4 as DC dual carriers

Dual carrier Group

F4 : Non homogeneous carrier


Case 4 – U900 and 5 Carriers Strategy(1)

G900

U900

G1800

U2100 F2

U2100 F4

U2100 F1 U2100 F1 U2100 F1

U2100 F2 U2100 F2

U900

Requirement: 1. U900 absorb weak coverage traffic 2. Prefer system capacity

U900

G900

G1800

G900

G1800

U2100 F3

DL10737

DL10713

DL10688

DL10663

DL3038

Suggestion: Random Camping Strategy and dedicated U900 strategy

Network Coverage:

1. F1/F2/G900 full coverage

2. U900,F3,F4 hotspot coverage



Key Switches for idle / connection mode cell reselection, RAB DRD, Inter-frequency handover, Load

reshuffling:

Parameter Value MML Command Parameter Description

SIB11Ind True/False ADD UINTERFREQNCELL

"FALSE" indicates that neighboring information are not

included in the SIB11.

"TRUE" indicates that neighboring information are included in

the SIB11.

SIB12Ind True/False ADD UINTERFREQNCELL

"FALSE" indicates that neighboring information are not

included in the SIB12.

"TRUE" indicates that neighboring information are included in

the SIB12

HOCovPrio 0/1/2/3 ADD UINTERFREQNCELL

"0" indicates that the coverage-based inter-frequency

handover is not supported. (based on load) Eg. for Blind HO

"1" indicates that the cell is assigned with the highest priority

for the handover.

"3" indicates that the cell is assigned with the lowest priority

for the handover.

BlindHoFlag True/False ADD UINTERFREQNCELL

“FALSE” indicates that the cell is not considered as a

candidate cell for blind handover.(HO based measurement)

“TRUE” indicates that the cell can be considered as a

candidate cell for blind handover

DrdOrLdrFlag True/False ADD UINTERFREQNCELL

"TRUE" indicates that the cell can be considered as the

measurement object in the DRD measurement algorithm or

LDR measurement algorithm. The value "FALSE" indicates

that the cell is invalid.

DR_RAB_SING_D

RD_SWITCH ON/OFF

SET

UCORRMALGOSWITCH DRD switch for single RAB

DR_RAB_COMB_D

RD_SWITCH ON/OFF

SET

UCORRMALGOSWITCH DRD switch for combine RAB

UE in idle mode

UE in Con mode

Type of Inter-freq HO


• UEs will camp on U2100 F1/F2, G900 and G1800 in idle mode (i.e. Access Layers).

• U900 set as “limited access layer” – UEs can reselect to U900 when coverage of U2100 F1/F2 is poor.

Idle UEs on U900 will reselect to F1/F2 when within U2100 coverage area.

• U900 layer will be considered as the coverage layer for both CS and PS – only one way for UE to go to

this layer (from all U2100 layers) during Connected Mode is due to coverage (i.e. Inter-Frequency HO).

• Coverage-based Inter-RAT from U2100 layers to G900 is for CS services only.

• Calls end on U2100 F3/4 will be forced to re-select to U2100 F1/F2, U900 or G900 immediately.

• F3 and F4 will be the Non-Access and HS-preferred layers – UEs will only perform HSPA RAB DRD

from F1 to co-sector F2/3/4 cells and from F2 to co-sector F1/3/4 cells.

• Combined 3G services will access at the current 3G cell, where the first service is being served.



• LDR happens

1) between all U2100 layers (bi-directional blind Inter-Frequency HO)

2) from 3G to G900 and co-sector G1800 for CS services only (Inter-RAT - only as 4th action for DL

LDR).

• Measurement-Based LDR algorithm will be enabled from U900 to U2100 F1/2 (feature can only

support 2 target frequencies according to 3GPP).

G900 / G1800 Layer :

• Re-selections to the G1800 layer is only possible via the G900 layer.

• Uni-directional traffic handovers are possible from G900 to G1800.

• UEs on G1800 can move to G900 in connected mode due to coverage.


U2100 F1

Case 4 – U900 and 5 Carriers Strategy(4) IDLE MODE CONNECTED MODE

U2100 F4

U2100 F1

U2100 F2

G900

G1800

Reselection (bi-directional)

Reselection (uni-directional)

U2100 F2

G900

G1800

U2100 F1

U2100 F3

Access Layer

Access Layer

Capacity/Non

Access Layer

Access Layer

U2100 F3

U2100 F1

U2100 F2

Coverage-based

(uni-directional) Traffic -based (uni-directional)

HSPA RAB DRD (co-sector, bi and uni-directional)

Blind IFHO LDR (co-sector, bi and uni-directional)

CS Inter-RAT and

LDR (to G900)

U2100 F1

U2100 F2

U2100 F4

U900 U900 U900 U900

Coverage-based CS & PS IFHO/ CS ISHO (uni-directional)

Measurement based LDR

Capacity/Non

Access Layer

U2100 F1

CS LDR (to G900)

For LDR ,2 possibilities :

-Blind HO or

-Measurement based HO

Load balance layer


Parameter U2100 F1 U2100 F2 U2100 F3 U2100 F4 U900

Cell Reselection

Qqualmin -18 dB -18 dB -18 dB -18 dB -18 dB

Qrxlevmin -58(-115dBm) -58(-115dBm) -58(-115dBm) -58(-115dBm) -58(-115dBm)

Qhyst2 1 (2dB) 1 (2dB) 1 (2dB) 1 (2dB) 1 (2dB)

IdleSintrasearch 5(10dB) 5(10dB) 5(10dB) 5(10dB) 5(10dB)

IdleSintersearch 4(8dB) 4(8dB) 127 (Off) 127 (Off) 127 (Off)

Inter-freq Neighbors

SIB11 Ind

To U900/F2 - True

To co-sector F3/4 –

False

To U900/F1 - True

To co-sector F3/4 -

False

To U900/F1 - True

To F2 and co-sector F4 -

False

To U900/F2 - True

To F1 and co-sector F3

– False

To F1/F2 - True

IdleQoffset2 - inter (for

ncells with SIB11 True)

0 dB –> U2100 F2

3 dB -> U900

0 dB –> U2100 F1

3 dB -> U900

-50 dB -> U2100 F1

3 dB –> U900

-50 dB -> U2100 F2

3 dB –> U900 -3 dB -> U2100 F1/2

Blind handover flag (for

LDR and DRD)

Only True for co-sector

U2100 cells


U2100 cells


U2100 cells


U2100 cells None

HOCOVPRIO U900 - 2

co-sector F2/3/4 - 0

U900 - 2


U900 and other F1 - 2


U900 and other F2 - 2

co-sector F1/2/3 – 0 F1/F2 - 2


Exemple :

3G cell with EcNo = -9 et RSCP = -106dB

Squal = CPICH_EC/No – qQualMin

Squal = -9 – (-18) = 9 > Sintrasearch = 5

If Squal > Sintrasearch, the UE need not start the intra-frequencymeasurement.

If Squal ≤ Sintrasearch, the UE need to start the intra-frequency measurement.

(Idle mode)



Inter-freq Handover (only for your reference, pls. refer to the default value according each version)

CS 2D -16dB/-110dBm -16dB/-110dBm -16dB/-110dBm -16dB/-110dBm -16dB/-110dBm

CS 2F -14dB/-108dBm -14dB/-108dBm -14dB/-108dBm -14dB/-108dBm -14dB/-108dBm

H 2D -16dB/-110dBm -16dB/-110dBm -16dB/-110dBm -16dB/-110dBm -16dB/-110dBm

H 2F -14dB/-107dBm -14dB/-107dBm -14dB/-107dBm -14dB/-107dBm -14dB/-107dBm

Inter-RAT Handover (only for your reference, pls. refer to the default value according each version)

CS 2D -16dB/-110dBm -16dB/-110dBm -16dB/-110dBm -16dB/-110dBm -16dB/-110dBm

CS 2F -14dB/-108dBm -14dB/-108dBm -14dB/-108dBm -14dB/-108dBm -14dB/-108dBm

H 2D -24dB/-115dBm -24dB/-115dBm -24dB/-115dBm -24dB/-115dBm -24dB/-115dBm

H 2F -21dB/-112dBm -21dB/-112dBm -21dB/-112dBm -21dB/-112dBm -21dB/-112dBm

Inter-Frequency and Inter-

RAT Coexist Switch SIMINTERFREQRAT SIMINTERFREQRAT SIMINTERFREQRAT SIMINTERFREQRAT INTERFREQ

CoexistMeasThdChoice

COEXIST_MEAS_TH

D_CHOICE_INTERF

REQ

COEXIST_MEAS_TH

D_CHOICE_INTERF

REQ

COEXIST_MEAS_TH

D_CHOICE_INTERF

REQ

COEXIST_MEAS_TH

D_CHOICE_INTERF

REQ

COEXIST_MEAS_T

HD_CHOICE_INTE

RFREQ



Measurement based LDR for U900 cell: TargetFreqThdRscp: -92 dBm, TargetFreqThdEcN0: -12 dB


DRD

Service Steering OFF OFF OFF OFF OFF

LdbDRDSwitchDCH OFF OFF OFF OFF OFF

LdbDRDSwitchHSDPA ON ON OFF OFF OFF

LdbDRDchoice UserNumber UserNumber UserNumber UserNumber UserNumber

H user balance Related

LdbDRDLoadRemain

ThdHSDPA 100(default) 100(default) 100(default) 100(default) 100(default)

MaxHsdpaUserNum 64(default) 64(default) 64(default) 64(default) 64(default)

LdbDRDOffsetHSDPA 1 -> Target blind HO cell will be considered as a DRD candidate when HS-DSCH load of source cell is greater than the

load of the target cell by 1% or more.



Appendix

Feature Number Feature Name

WRFD-020110 Multi Frequency Band Networking

WRFD-020160 Enhanced Multiband Management

WRFD-02040001 Intra System Direct Retry

WRFD-02040002 Inter System Direct Retry

WRFD-02040003 Inter System Redirect

WRFD-02040004 Traffic Steering and Load Sharing During RAB Setup

WRFD-020302 Inter Frequency Hard Handover Based on Coverage

WRFD-020103 Inter Frequency Load Balance

WRFD-021200 HCS (Hierarchical Cell Structure)

WRFD-020105 Potential User Control

WRFD-020402 Measurement Based Direct Retry

WRFD-020160 Enhanced Multiband Management

Feature Number Feature Name WRFD-02040001 Intra System Direct Retry



WRFD-02040004 Traffic Steering and Load Sharing During RAB Setup

WRFD-020302 Inter Frequency Hard Handover Based on Coverage

WRFD-020103 Inter Frequency Load Balance

WRFD-021200 HCS (Hierarchical Cell Structure)

WRFD-020105 Potential User Control

WRFD-02040001 Intra System Direct Retry



WRFD-020402 Measurement Based Direct Retry

Feature Number Feature Name WRFD-020303 Inter-RAT Handover Based on Coverage

WRFD-020306 Inter-RAT Handover Based on Load

WRFD-020305 Inter-RAT Handover Based on Service

WRFD-020401 Inter-RAT Redirection Based on Distance

• 2G/3G inter-operation

• Multi-carrier relevant features

• Multi-frequency relevant features

Thank you www.huawei.com

umts multi carrier strategy training

Documents

cell load

access policy feature

cell priority

drd of blind handover

decision drd feature

delay measurementbased

target cell

cell technology priority