2G3G Network Interworking Strategy.pdf

7/25/2019 2G3G Network Interworking Strategy.pdf

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HUAWEI TECHNOLOGIES CO., LTD. Huawei Confidential

Security Level: Internal

www.huawei.com

2G/3G Network Inter-working

Strategy

2008-08
http://www.huawei.com/http://www.huawei.com/


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HUAWEI TECHNOLOGIES CO., LTD. Page 2Huawei Confidential

What kind of problems we have?

n How to protect the investment in 2G network?

n How to execute the evolution from 2G to 3G?

n How to cut the CAPEX and OPEX in the 3G network

construction and assure the quality of the network?

n Guarantee the continuity of the service

n Lower the impact on 2G network

Answer: Re-use the 2G resourc es as poss ib le as we can!

Answer :

Ado pt go od inter-operat ion strategy;

Execute excellent RNO for the inter-wo rking between two sys tem


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Contents

What kind of 2G resources could be re-used

Inter-operation between 3G&2G network

Network Deployment and Operation Strategy


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2G resources could be used for 3G

Site roomTower

RF system

ToolsDT data

Traffic stats.Configuration

User distribution

Team organizationOperation experiences

Technical teams

2G Resources

3G Network

Voice

VP

Internet

Videostreaming

Games

13.36%

86.65%86.21%85.04%80.56% 83.70%

0 . 0 0 %

20.00%

40.00%

60.00%

80.00%

1 0 0 . 0 0 %

Indoor

PS384

Indoor

PS144

IndoorCS64 Indoor Voice In-car CS64 In-car CS64

Outage

Kowloon(Sunday)


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Commercial cases for 2G/3G co-existing

SUNDAY 3G commercial data

q 85% 3G/2G co-site

q 65% 3G/2G co-antenna

SUNDAY 3G commercial dataSUNDAY 3G commercial data

qq 85% 3G/2G co85% 3G/2G co--sitesite

qq 65% 3G/2G co65% 3G/2G co--antennaantenna

UAE Etisalat 3G commercial data

q 80% 3G2G co-site

q 1.2% 3G2G co-antenna

UAE Etisalat 3G commercial dataUAE Etisalat 3G commercial data

qq 80% 3G2G co80% 3G2G co--sitesite

qq 1.2% 3G2G co1.2% 3G2G co--antennaantenna


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Co-siting Solutions

Shared Powersuppl ier

Co-feedersystem

Huawei 3G

Node B

2G BTS

2G B TS Hu aw ei 3G Min i No de B Huawei 3G Macro Node B2G BTS

l Reduce site acquisition timel Save site rental &

construction cost

l Share existing support

equipments


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n Solve space limitation of GSM site room

n BBU set inner to all-in-one trunk/ power trunk, transmission

trunk or GSM cabinet

n Solution without enough site room , fast, simple, cost saved

Co-GSM cabinet

5/10/20W TOC

220VAC or -48VDC

RRU3801C/02C/03C

FIBER

Mini BBUSet inner to local

GSM BSFeeders


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Co-tower SolutionsInterference control

Horizontal space isolation

Vertical space isolation

UMTS2100 NodeB and

GSM900 BTS

UMTS2100 NodeB

and GSM1800 BTS

Isolation DegreedB! 35 43

Minimum Vertical Distance at the

same pole (m)0.2 0.2

Minimum Horizontal distance (m) 0.5 1

The isolation requirement between UMTS and GSM antenna is easy to

achieve!


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Co-DAS solution

n Save the facilities and cut the cost

n Fasten the deployment time and lower the man power requirement

n More easier to execute the trouble-shooting

cable

Multi-

frequency

combiner

Power divider & coupler

Advantages:

WCDMAGSM


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2G Drive Test Data for 3G Coverage Planning

2G/3GDrive test

data

3GCoverage

Prediction

n Improve 3G coverage prediction accuracy

n Facilitate the trouble shooting of 3G coverage andinterference problems

n Verify if 2G DAS system can also work for 3G


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Re-use 2G traffic as reference

VIP zones and user profile

definitionsVIP Zone

Rejection Ratio

3G Simulation based on 2G Traffic

VIP userdistribution

0.5%

Whole NetworkRejection Ratio

2.4%

Use 2G traffic as reference toget/adjust 3G traffic model


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Packet Switch CN Sharing Strategy

Packet Switch Sharing Structure

Node B RNC

BSCBTS

SGSN GGSN

HLR


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Packet Switch CN Deployment Strategy

Advantages of Sharing strategy compared with separate strategy! Less equipments

1 set of SGSN and GGSN for 2 networks

! Better handover! delay

Inter-RAT handover is processed in 1 SGSN

! Sharing capacity

3G traffic will be low at the initial stage, while 2G traffic remain growing;

No need expansion after 2G subscriber migrate to 3G in the mature stage

! Faster commissioning

Without inter-SGSN commissioning, the 3G network is easier to be build up

! Less maintenance

Maintenance job is only need to be done with 1 set of equipments

So the best solut ion is to sh are the PS Switch Equipm ent!


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3G and 2G Subscriber Classify Strategy

1.HLR supports 3G and 2G Classify feature

Enable the feature to divide 3G and 2G subscriber

2.HLR does not support 3G and 2G classify feature

Set in MSC that 3G subscriber support Video Phone servicewhile 2G subscriber do not support it. Then to classify the 3G and

2G subscriber base on Video Phone support conditions.

*Handset must support 3G

Strategy 1 is appl ied in most 3G networks i f HLR can su pport .

HLR

3G user

2G user

MSC

Support VP

Not support VP


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3G Service Availability for 2G subscriber

1. 2G subscriber is able to log on 3G network, but can not enjoyVideo Phone and broadband service until migrate to 3G

subscriber.

3G network can share the voice load with 2G

Easy to control the video phone and broadband traffic trend

2. 2G subscriber is prohibit to access 3G network until migrate to3G subscriber.

Separate traffic statistic

Easy to control the 3G traffic trend

3. 2G subscriber is able to enjoy all 3G services without any

registry.

Strategy 1 is propo sed to be appl ied in Bangladesh.


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Migration of 2G Subscriber to 3G

1. Migration without changing SIM card or number

! HLR must support 3G and 2G

! Reduce work load of customer service

2. Migration and change SIM card without changing number

! HLR must support this feature

3. Migration and change SIM card and number

! Applicable for separate HLR for 3G and 2G

Strategy 1 is appl ied by most of operators.


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Contents

What kind of 2G resources could be re-used

Inter-operation between 3G&2G network

Network Deployment and Operation Strategy


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3G/2G Inter-working Analysis

n Minimize the impact on theexisting GSM network.

n Use 2G network to expand thecoverage of 3G network and keep

continuous service provisioning.

n Use 3G network to bear services

for dual-mode handsetsconsidering UMTS air-interface is

more efficient in cost per voice

user than GSM.

n Avoid as much as possible theinter-system handover to reduce

the impact on GSM network

Proper 3G/2G

Handover Strategy

Proper 3G/2G

Handover Strategy

Service Continu i ty in idle mod e

Serv ice Cont inu i ty in connected mod e

Proper 3G/2G

Roaming Strategy

Proper 3G/2G

Roaming Strategy


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3G/2G Roaming Strategy -- Idle mode

3G subscribers configured

to camp on WCDMA

network with the higher

priority

GSM

WCDMA WCDMA

UMTS GSMcell reselection

GSM UMTScell reselection

n Cell reselection from UMTS to GSM networks

1. via Inter-system Cell Reselection : No upgrade for GSM networks

n Cell reselection from GSM to UMTS networks1. via Inter-system Cell Reselection: GSM networks already support R99


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3G/2G Handover Strategy -- Connection mode

Camping on UMTS

in idle modeHandover to

2G

Staying in 2G

during the call

Call ends, Cell

Reselection to 3G

Service begins

Cell Reselection

or Cell Change

Order to GPRS

Cell Reselection

to UMTS

Cell Reselection

to GPRS

CS

Services

PacketServices

UMTS cell

GSM/GPRS cell

n Unidirectional handover from UMTS to GSM is proposed for CS services.

n Bidirectional handover between UMTS and GSM by cell reselection is proposedfor PS services


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Thank youwww.huawei.com
http://www.huawei.com/http://www.huawei.com/

Documents

2G3G Network Interworking Strategy.pdf