HUAWEI 3G_2G Inter Working Solution
Transcript of HUAWEI 3G_2G 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
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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
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Contents
3G/2G Roaming
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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
ËË
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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
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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
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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
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Contents
3G/2G Handover
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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
ü
Inter-system handover based on
service
Inter-system handover based on
load
Inter-system handover based on
coverage
2G 3G Bidirectional handover
Unidirectional handover from 3G
to 2G
ü ü ü ü
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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
Second 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
Second 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
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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
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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.
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Improved 3G/2G Handover Performance
C S _INT R A T _HO _O UT _S UC C _RA T E(% )
60 . 00%
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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%.
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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
þ Little impact on existing 2G networkþ R99 version of GSM network recommendedþ Little impact on existing 2G networkþ R99 version of GSM network recommended
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Contents
Case Study
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Rich Experience in 3G/2G IOT
CMCC Beijing, ChinaChina Telecom, Guang Zhou
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Etisalat, U.A.ECMCC, Beijing, ChinaBMCC, Beijing, China
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Etisalat, U.A.E.Telekom Malaysia, MalaysiaCMCC, Beijing , China
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Telecom Malaysia, MalaysiaCMCC, Beijing , China
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Sunday, Hong KongCMCC, Beijing, China
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Etisalat, U.A.E.Telfort, HollandTelekom Malaysia, Malaysia etc.CMCC, Beijing, China
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Etisalat, U.A.E.Emtel, Mauritius.CMCC, Beijing, China
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BSS LocationNSS
Huawei has successfully completed 3G Interoperability Testing (IOT) with major vendors’ 2G equipments around the world.
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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%
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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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Thank youwww.huawei.com
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