HUAWEI 3G2G Inter Working Solution

HUAWEI TECHNOLOGIES CO., LTD.

www.huawei.com

Huawei Confidential

Security Level: Confidential2008-5-11

3G Network Planning introduce

HUAWEI 3G/2G InterHUAWEI 3G/2G Inter--working Solutionworking Solution

Huawei Northwest Africa Region

RNP Solution Manage: William.chen

[email protected]

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HUAWEI TECHNOLOGIES CO., LTD. Page 2Huawei Confidential

3G/2G Inter-working Proposal

p Minimize the impact on the existing GSM network.

p Use 2G network to expand the coverage of 3G network and keep continuous service provisioning.

p Use 3G network to bear services for dual-mode handsets considering UMTS air-interface is more efficient in cost per voice user than GSM.

p Avoid as much as possible the inter-system handover to reduce the impact on GSM network

Proper 3G/2GHandover Strategy

Proper 3G/2GHandover Strategy

Service Continuity in idle mode

Service Continuity in connected mode

Proper 3G/2GRoaming Strategy

Proper 3G/2GRoaming Strategy



Contents

3G/2G Roaming



3G/2G Roaming Solution

In idle mode

GSM network

WCDMA WCDMA

3G subscriber return to GSM in

3G poor coverage 3G Subscriber camp on 3G in

2G3G co-cover area

3G subscriber must has two pre-conditionsHe must has a 3G mobile phone

He must apply a 3G service USIM card

3G subscriber prefer to 3G networkpreferred to camp on 3G network in co-cover area;

There are two solution to be provided: HPLMN reselection and Cell reselection



HPLMN reselection

HPLMN reselection: selected by PLMN mark ID

In idle mode

GSM

WCDMA WCDMA

2G Network

3G Network

2G PLMN is set to VPLMN

3G PLMN is set to HPLMN

1) 3G Subscriber search VPLMN and HPLMN in co-cover area.

2) He will select HPLMNnetwork periodically.

3G Subscriber will do HPLMN reselect after he leave the WCDMA coverage area and return to GSM network.

Important configurationHPLMN Searching time minimum:6minutes; maximum: 8hours.

Suggestion configuration: 30min



Cell Selection & Reselection

HPLMN reselection: selected by coverage condition

Step 1

3G subscriber will search WCDMA and GSM signal every second

GSM

WCDMA WCDMA

Step 2

Order all signal by strength

Offset should be added

Step 3

Chose the first oneto camp on

Sign

al s

treng

th

GSM

Cell1WCDMA

Cell1GSM

Cell2WCDMA

Cell2

Cell in search

OffsetOffset



Choose which?

Advantage:n Rapidly roam back to 3Gn Less power consumption in idle

statusn Support costumers with 2G SIM

to enjoy 3G serviceDisadvantagen Modify 2G system information

Advantage: n none change on 2GDisadvantage: n Slow speed of roaming from 2G

to 3G, at least 6 minutes, usual 30minutes

n More power consumption in idle status

n Not support costumers with 2G SIM to enjoy 3G service

Advantage &disadvanta

ge

Cell ReselectionPLMN Reselection



Contents

3G/2G Handover



Huawei supports all types of 3G/2G handover.

f2

Macro layer

Micro layer

Inter-frequency handover:Triggered by Load/Coverage

Inter-cell handover:Triggered by signal Strength

Inter-system handover

GSM

WCDMA f1

Inter-system handover based on

service


load


coverage

2G 3G Bidirectional handover

Unidirectional handover from 3G

to 2G



Suburban

Second Priority Layer

First Priority LayerIndoor WCDMA

(f1)

Macro WCDMA (f2)

Indoor GSM

Macro GSM

Macro DCS

Handover based on load

Handover based on coverage

Third Priority Layer


First Priority Layer

Dense Urban/Urban

Fifth Priority Layer

Indoor DCS Micro DCS

Micro WCDMA

(f1)First Priority Layer

Third Priority Layer

Fourth Priority Layer


Dense urban/hot spot use complicated Layer Structure Many kinds of handover is applied

Few Layers in Suburban Sample handover

Case Study of Layer Structure in Indonesia



Inter-RAT Handover strategy

2G Coverage

3G Coverage

n CS Handover Strategy: coverage based 3G handover to 2G, 2G back to 3G by cell reselection

n PS Handover Strategy: 3G and 2G bidirectional handover by cell reselection (including HSPA service)

n CS Handover Strategy: coverage based 3G handover to 2G, 2G back to 3G by cell reselection

n PS Handover Strategy: 3G and 2G bidirectional handover by cell reselection (including HSPA service)

CS Handover

Handover to 2G

Cell Reselection to 3G

Cell Reselection to 2G

Cell Reselection to WCDMA

PS Handover



Handover Strategy in different stages

INITIAL STAGE EXPANDING STAGE MATURE STAGE

Coverage-based Handover

Service-based Handover

Load-based Handover

Coverage-based Handover

Load-based Handover

n Initial Stage: 3G coverage for dense urban areas and 2G network for coverage extension. Coverage-based handover strategy is used.

n Expanding Stage: 3G coverage expanded and 3G traffic increased. Handover is based on coverage as well as on load in this stage.

n Mature Stage: 3G developing further to provide full coverage and 3G traffic rocketed, reaching the mature stage. Increasing number of subscribers migrated to 3G, leading to a lightly-loaded 2G network bearing voice and low-speed data services for 3G. Handover is mainly based on service and load in this stage.

n Initial Stage: 3G coverage for dense urban areas and 2G network for coverage extension. Coverage-based handover strategy is used.

n Expanding Stage: 3G coverage expanded and 3G traffic increased. Handover is based on coverage as well as on load in this stage.

n Mature Stage: 3G developing further to provide full coverage and 3G traffic rocketed, reaching the mature stage. Increasing number of subscribers migrated to 3G, leading to a lightly-loaded 2G network bearing voice and low-speed data services for 3G. Handover is mainly based on service and load in this stage.



Improved 3G/2G Handover Performance

C S _INT R A T _HO _O UT _S UC C _RA T E(% )

60 . 00%

65 . 00%

70 . 00%

75 . 00%

80 . 00%

85 . 00%

90 . 00%

95 . 00%

100 . 00%

2005

-3-3

1

2005

-4-2

2005

-4-4

2005

-4-6

2005

-4-8

2005

-4-1

0

2005

-4-1

2

2005

-4-1

4

2005

-4-1

6

2005

-4-1

8

2005

-4-2

0

2005

-4-2

2

2005

-4-2

4

2005

-4-2

6

2005

-4-2

8

2005

-4-3

00

500

1000

1500

2000

2500

C S_INTR A T_HO _O UT_SUC C C S_ INTR A T_HO _O UT_A TTC S_INTR A T_HO _O UT_SUC C _R A TE(% )

The following chart shows the filed KPI measurement of 3G/2G handover during April 2005 in a live network for which HUAWEI provided 3G network equipments.

Average success rate of inter-RAT handover with HUAWEI 3G/2G handover strategy reaches up to 98.5%.Average success rate of inter-RAT handover with HUAWEI 3G/2G handover strategy reaches up to 98.5%.



3G/2G Inter-working Impact on 2G Network

Only cell reselection

2G to 3G handover

3G to 2G handover

2G->3G roaming

3G->2G roaming

3G/2GInter-working Types

Only System information changes in 2G BSS

Only System information changes in 2G BSSPS Service

BSS needs upgrade only when GSM is the R98 or earlier version.

No need of upgradeCS Service

Roaming

3G/2GCollaboration

Function

Little impact on existing 2G network R99 version of GSM network recommended Little impact on existing 2G network R99 version of GSM network recommended



Contents

Case Study



Rich Experience in 3G/2G IOT

CMCC Beijing, ChinaChina Telecom, Guang Zhou

Etisalat, U.A.ECMCC, Beijing, ChinaBMCC, Beijing, China

Etisalat, U.A.E.Telekom Malaysia, MalaysiaCMCC, Beijing , China

Telecom Malaysia, MalaysiaCMCC, Beijing , China

Sunday, Hong KongCMCC, Beijing, China

Etisalat, U.A.E.Telfort, HollandTelekom Malaysia, Malaysia etc.CMCC, Beijing, China

Etisalat, U.A.E.Emtel, Mauritius.CMCC, Beijing, China

BSS LocationNSS

Huawei has successfully completed 3G Interoperability Testing (IOT) with major vendors 2G equipments around the world.



UAE Etisalat - 2G/3G Inter-working

n UAE Etisalat 2G/3G inter-working n Huawei 3G network and ERICSSON, SIMENS/NEC, ALCATEL, and Motorola 2G networks

n 98% success rate of inter-system handover

n Subscribers hardly noticed the handover between the two networks

90.0%91.0%92.0%93.0%94.0%95.0%

97.0%98.0%99.0%

100.0%

96.0%

1000

2000

3000

4000

6000

7000

8000

5000

0Nov-04 Dec-04 Jan-05 Feb-05 Mar-05 Apr-05 May-05 Jun-05

InterRAT HO_SUCC_RATE(%) Handover Attempts

Average daily attempts Average SR

Success rate of inter-system handover for eight consecutive months of Etisalat 3G 2G

+


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HUAWEI 3G2G Inter Working Solution