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
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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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