Huawei 3g_2g Inter Working Solution

Security Level: Confidential

2008-5-11

HUAWEI 3G/2G Interworking Solution 3G Network Planning introduce www.huawei.com

Huawei Northwest Africa Region RNP Solution Manage: William.chen [email protected] HUAWEI TECHNOLOGIES CO., LTD.

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Huawei 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 intersystem handover to reduce the impact on GSM network

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Service Continuity in idle mode

Proper 3G/2G Roaming Strategy

Proper 3G/2G Handover Strategy Service Continuity in connected mode

Huawei Confidential

Page 2

Contents

3G/2G Roaming

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3G/2G Roaming Solution 3G subscriber must has two pre-conditions

Ë

He must has a 3G mobile phone He must apply a 3G service USIM card

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

In idle mode

3G Subscriber camp on 3G in 2G3G co-cover area

WCDMA

3G subscriber return to GSM in 3G poor coverage

WCDMA

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

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HPLMN reselection HPLMN reselection: selected by PLMN mark ID 2G Network

2G PLMN is set to VPLMN

3G Network

3G PLMN is set to HPLMN

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

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

In idle mode

2) He will select HPLMN network periodically.

WCDMA

WCDMA

Suggestion configuration: 30min

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

GSM

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Cell Selection & Reselection HPLMN reselection: selected by coverage condition Step 1

Step 2

3G subscriber will search WCDMA and GSM signal every second

Order all signal by strength Offset should be added

Signal strength

Offset Offset

GSM Cell1

WCDMA Cell1

Chose the first one to camp on

WCDMA

WCDMA

GSM

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WCDMA

Cell2

Cell2

Cell in search

Step 3

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GSM

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Page 6

Choose which? PLMN Reselection Advantage &disadvanta ge

Cell Reselection

Advantage:

Advantage:

n

n

Rapidly roam back to 3G

n

Less power consumption in idle

none change on 2G

Disadvantage: n

Slow speed of roaming from 2G to 3G, at least 6 minutes, usual

status n

30minutes n n

Support costumers with 2G SIM to enjoy 3G service

More power consumption in

Disadvantage

idle status

n

Modify 2G system information

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

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Page 7

Contents

3G/2G Handover

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Huawei supports all types of 3G/2G handover. GSM Inter-system handover

Macro layer

WCDMA

f1 Inter-frequency handover: Triggered by Load/Coverage

f2

Micro layer Inter-cell handover: Triggered by signal Strength

Unidirectional

2G 3G Bidirectional

Inter-system

Inter-system

Inter-system

handover from 3G

handover

handover based on

handover based on

handover based on

ü

coverage

load

service

to 2G

ü

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ü

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ü Page 9

ü

Case Study of Layer Structure in Indonesia Dense Urban/Urban Suburban

Micro

Few Layers in Suburban Sample handover First Priority Layer WCDMA (f1)

First Priority Layer Second Priority Layer

Macro WCDMA (f2) First Priority Layer

Indoor WCDMA (f1)

Indoor DCS

Micro DCS

Second Priority Layer

Third Priority Layer

Indoor GSM Macro DCS

Second Priority Layer Layer Fourth Priority

Handover based on load

Third Priority Layer Layer Fifth Priority

Macro GSM

Handover based on coverage

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

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Inter-RAT Handover strategy Cell Reselection to 2G

PS Handover

Cell Reselection to 3G

3G Coverage Cell Reselection to WCDMA Handover to 2G

CS Handover

2G Coverage

n n CS CS Handover Handover Strategy: Strategy: coverage coverage based based 3G 3G handover handover to to 2G, 2G, 2G 2G back back to to 3G 3G by by cell cell reselection reselection n n PS PS Handover Handover Strategy: Strategy: 3G 3G and and 2G 2G bidirectional bidirectional handover handover by by cell cell reselection reselection (including (including HSPA HSPA service) service)

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Handover Strategy in different stages

n n n n n n

Load-based

Load-based

Handover

Handover

Coverage-based

Coverage-based

Service-based

Handover

Handover

Handover

INITIAL STAGE

EXPANDING STAGE

MATURE STAGE

Initial Initial Stage: Stage: 3G 3G coverage coverage for for dense dense urban urban areas areas and and 2G 2G network network for for coverage coverage extension. extension. Coverage-based Coverage-based handover handover strategy strategy is is used. used. Expanding Expanding Stage: Stage: 3G 3G coverage coverage expanded expanded and and 3G 3G traffic traffic increased. increased. Handover Handover is is based based on on coverage coverage as as well well as as on on load load in in this this stage. stage. Mature Mature Stage: Stage: 3G 3G developing developing further further to to provide provide full full coverage coverage and and 3G 3G traffic traffic rocketed, rocketed, reaching reaching the the mature mature stage. stage. Increasing Increasing number number of of subscribers subscribers migrated migrated to to 3G, 3G, leading leading to to aa lightly-loaded lightly-loaded 2G 2G network network bearing bearing voice voice and and low-speed low-speed data data services services for for 3G. 3G. Handover Handover is is mainly mainly based based on on service service and and load load in in this this stage. stage.

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Improved 3G/2G Handover Performance 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. C S _ INT R A T _ HO _ O U T _ S U C C _ R A T E (% ) 100. 00%

2500

95. 00%

2000

90. 00% 85. 00%

1500

80. 00% 1000

75. 00% 70. 00%

500

65. 00% 60. 00%

0 -3

8

-4 05

20

20

05

-4

-2

6 -2

4

-4

20

05

-4

-2

2 20

05

-4

-2

0 20

05

-4

-2

8 20

20

05

-4

-1

6

C S _ IN T R A T _ H O _ O U T_ S U C C C S _ IN T R A T _ H O _ O U T_ S U C C _ R A TE (% )

05

-4

-1

4 05 20

20

05

-4

-1

2 -1

0

-4 05

20

20

05

-4

-1

-8 -4

-6 20

05

-4

-4 20

05

-4

-2

05

-4 20

05 20

20

05

-3

-3

1

0

C S _ IN TR A T _ H O _ O U T _ A TT

Average Average success success rate rate of of inter-RAT inter-RAT handover handover with with HUAWEI HUAWEI 3G/2G 3G/2G handover handover strategy strategy reaches reaches up up to to 98.5%. 98.5%. HUAWEI TECHNOLOGIES CO., LTD. PDF created with pdfFactory Pro trial version www.pdffactory.com

Huawei Confidential

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3G/2G Inter-working Impact on 2G Network þ þ Little Little impact impact on on existing existing 2G 2G network network þ þ R99 R99 version version of of GSM GSM network network recommended recommended

Function Roaming

3G/2G

3G/2G

Inter-working Types

Collaboration

3G->2G roaming

Only System information changes in 2G BSS

2G->3G roaming CS Service

3G to 2G handover

No need of upgrade

2G to 3G handover

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

PS Service

Only cell reselection

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Only System information changes in 2G BSS

Huawei Confidential

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Contents

Case Study

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Rich Experience in 3G/2G IOT Huawei has successfully completed 3G Interoperability Testing (IOT) with major vendors’ 2G equipments around the world. NSS

BSS

√ √ √ √

√ √ √ √

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

√ √

√ √

Telecom Malaysia, Malaysia CMCC, Beijing , China

√ √

√ √

Sunday, Hong Kong CMCC, Beijing, China

√ √

√ √ √

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

√ √ √

√ √

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

√ √

√ √

CMCC Beijing, China China Telecom, Guang Zhou

√ √

√ √ √

Etisalat, U.A.E CMCC, Beijing, China BMCC, Beijing, China

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Location

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UAE Etisalat - 2G/3G Inter-working InterRAT HO_SUCC_RATE(%) 100.0% 99.0% 98.0% 97.0% 96.0% 95.0% 94.0% 93.0% 92.0% 91.0% 90.0%

Handover Attempts 8000 7000 6000 5000 4000 3000 2000 1000

Nov-04 Dec-04 Jan-05 Feb-05 Mar-05 Apr-05 May-05 Jun-05 Average daily attempts

0

+

Average SR

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

3G

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 HUAWEI TECHNOLOGIES CO., LTD. PDF created with pdfFactory Pro trial version www.pdffactory.com

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2G

Thank you www.huawei.com

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