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ZTE 2G/3G Network Merging StrategyZTE 2G/3G Network Merging Strategy
Abstract
2G/3G merging strategy; Max. use 2G resource:
2G/3G co-site 2G/3G transmission sharing; Dual mode RNC & BTS; Share CN, GW, BOSS & Billing Centre
2G/3G inter-operation: Ensure 3G services feeling:
3G user prior 3G network selection 2G/3G services inter-connection 3G service continuity
Ensure 2G users network transfer 2G MNP to 3G 3G keeps the service integrity
Operators preparation to 2G/3G merging
This presentation includes:
2G/3G Merge Strategy
2G Resource Merge & Utilization
2G/3G Equipment Inter-operation
2G/3G Merge Preparation Suggestion
2G/3G Merge Strategy
2G Resource Merge & Utilization
2G/3G Equipment Inter-operation
2G/3G Merge Preparation Suggestion
2G/3G equipment inter-operation
2G/3G Merge Tasks
3G user service feeling
2G user transfer
2G/3G resource merge & reuse
2G/3G merge strategy
Low cost, fast implementation
Service continuity
3G user prior 3G selection
2G/3G service inter-connection
MNP Service integrity
2G/3G co-site
Dual-mode BTS & RNC
Share OMC, Billing & BOSS
Share CN & GW
Transmission sharing
Keep users service experience
2 solutions integrity & phased construction suggestion
3G Prior & MNP With Potential Problems
3G user prior 3G selection
MNP & 2G/3G access control
Prior 3G may affect MNP
PLMN solutionCell reselection
ARD Multi-PLMN HLR MNP
2G/3G Merge Principle Suggestion
Max. utilize existing resource, reduce the initial networking cost for a fast implementation
According to the existing network to ensure users feeling Combining different scenarios & conditions, applying with flexible strategy
The relate functions need to upgrade to satisfy the 3G requirement According to some difficulties, apply no network upgrade as a intergradations
2G/3G Merge Strategy
2G Resource Merge & Utilization
2G/3G Equipment Inter-operation
2G/3G Merge Preparation Suggestion
2G/3G Merge Strategy
2G Resource Merge & Utilization
2G/3G Equipment Inter-operation
2G/3G Merge Preparation Suggestion
2G/3G Co-site
Study 2G sites and make a statistic of free space, power redundancy, transmission redundancy,
tower condition, etc.
According to the each site & 2G traffic to make a reasonable and suitable planning
Shelter sharing AC sharing
Cable distribution box sharing
Cable tray sharingTower sharing
Battery sharing Power sharing
Microwave sharing
Co-room/cabin
3G
BTS Co-transmission
2G
BTSCo-tower
Co-feed-cable
window
P B A M
2G/3G Transmission Sharing SDH Based
Feeder
Iub/Abis
RNCRNC
BSCBSC
Fractional E1 SolutionFractional E1 Solution
BTSBTS
Node BNode B Fractional E1 (N*64K)
Uses Fractional E1 to implement 3G ATM/IP and 2G TDM in a same physical line in order to save E1/T1.
BTS & Node B in same room and 2G need redundant transmission resource 2G & 3G has Fractional E1 function. If does not support it, TS exchange equipment will
implement it.
TS exchange TS exchange
SDH
In the initial stage, when 2G has redundant transmission, 3G can through 2G access to transmission network.
When the 3G traffic expanded & 2G shrink, 2G can through 3G to transmission.
2G/3G Transmission Share Shunt Transmission
IP UTRAN is the tendency of transmission development. Along with IP UTRAN mature, UTRAN will have a transfer from SDN to IP
GERAN structure based 2G BSS IP has been the trend for the transmission development .
Shunt transmission based network 2G A/Gb IP support, Simplify 2G/3G RAN & CN topology. 2G/3G share IP & SDH, adopts shunt transmission. signaling, real time service on
SDH. Non-real time service on IP.
2G for voice, 3G for data
IP
IP backboneBSC
BTS
Node B
GGSN
MGW
SGSNRNC
MSC Server
SDH
SDH
IP
Unified 2G/3G CN (CS/PS)
CS
Soft switch will save CAPEX and OPEX SS brings the revolution to the conventional telecom networking, saves
CAPEX SS brings the revolution to the O&M, save OPEX
Unified 2G GPRS & 3G PS enhance data application 2G GPRS & 3G PS has unified SGSN/GGSN, reduces CAPEX Automatic balance GPRS/3G traffic.
GPRS3G PS
2G/3G Merge Strategy
2G Resource Merge & Utilization
2G/3G Equipment Inter-operation
2G/3G Merge Preparation Suggestion
2G/3G Merge Strategy
2G Resource Merge & Utilization
2G/3G Equipment Inter-operation
2G/3G Merge Preparation Suggestion
3G Service Guarantee Strategy3G Service Guarantee Strategy
User 3G Prior Selection
2G/3G Service Inter-connection
3G Service Continuity
3G User Prior Camping in 3G Network
2G Coverage
3G Coverage
User finish call in 2G network
Camping in 2G after power on
Origin call in 2G & move to 3G
Scenario 1:User start call in 2G and move to 3G. It will still use 2G connection. After hang off, it will select 2G to camping
Scenario 2:User power on in 3G, some of UE will select 2G to camping
Problem:User will only camping in 2G
Solution:1Make modification (cell reselection)2No modification (PLMN)3Staged construction (combine 1 & 2)
Upgrade Network Cell Reselection
WCDMAWCDMAGSMGSM
WCDMA>GSM Cell reselection, voice & PS HO
GSM>WCDMA Cell reselection back to 3G in idle No voice HO, only PS HO
Suitable to 2G/3G in same or diff. MNC. But same MNC is recommended.
GSM needs to support 2G->3G cell reselection
RequirementRequirement
Advantage User do not change SIM & number Fast action from 2G back to 3G
Disadvantage GSM should be upgraded to support 2G->3G cell reselection Abundant upgrade task
Cell reselection is the main stream solution chosen by operatorsCell reselection is the main stream solution chosen by operatorsCell reselection is the main stream solution chosen by operators
Cell Reselection Principle
UERNC 3G CNBSC 2G CN
Some Some UEsUEs choose GSM networkchoose GSM network
Broadcast parameter setting makes UE is easy to trigger 2G to 3GBroadcast parameter setting makes UE is easy to trigger 2G to 3G reselectionreselection
Few secondsFew seconds
System broadcastSystem broadcast
RNC sent parameters setting to make UE keep camping in 3GRNC sent parameters setting to make UE keep camping in 3G
Problem: overlay area, some UEs will choose GSM and not able to have 3G service.
Cell reselection solution: 2G BSC sen s broadcast setting to trigger UE cell reselection to 3G
d
Cell Reselection Requirement to 2G Equipment
2G BSC Support broadcast to re-set cell reselection
threshold 3G neighbor cells will be added.
Cell reselection solution is based on the users feeling. When they are in the 3G coverage, they will fast access to 3G.
2G equipment needs to upgrade.
2G equipment upgrade2G equipment upgrade
No Network Upgrade PLMN Solution
WCDMAWCDMAGSMGSM
WCDMA>GSM Cell reselection to realize,
support CS & PS HO.
GSM>WCDMA Through HPLMN reselection to
3G when in idle No CS HO or PS HO
GSM & WCDMA should be diff. MNC W Users need new USIM. USIM set W network as
HPLMN and periodically choose HPLMN
Advantage No upgrade to GSM Less combining debugging to GSM & WCDMA
Disadvantage GSM transfer to WCDMA need to change SIM HPLMN reselection cost 6 minutes, degrades users feeling
RequirementRequirement
PLMN selection suitable to the operators who are not capable to realize GSM to WCDMA reselectionPLMN selection suitable to the operators who are not capable to PLMN selection suitable to the operators who are not capable to realize GSM to WCDMA reselectionrealize GSM to WCDMA reselection
PLMN Principle
UERNC 3G CNBSC 2G CN
6 minutes6 minutes
Some Some UEsUEs choose GSM to registerchoose GSM to register
Each 6 minutes will attempt to access 3G networkEach 6 minutes will attempt to access 3G network
Problem: inner overlay area, UE w eep in GSM, can not use 3G service
ill k
PLMN selection solution: 3G needs new USIM, 3G adopts new MNC, USIM needs to periodically detect 3G and prio ose 3G. r cho
Comparison
PLMN Selection Cell Reselection
Common3G->2G: realize cell reselection, CS & PS HO 2G->3G: back to 3G in idle state, no CS HO
DifferentIn idle uses homing PLMN reselection back to 3G. It costs 6 minutes and need 2 networks with diff. MNC
In idle 2G to 3G uses cell reselection. Fast reaction, suitable for both same and diff. MNC. But the same MNC is recommended.
Effects to 2G
No need upgrade 2G, less combining debugging.
Need to upgrade 2G to 3G cell reselection, abundant debugging tasks.
Effects to 2G User
2G transfer need new SIM. Only when HLR supports MNP to keep the same number.
No change card and number
User feeling Takes a long time back to 3G good
ScenariosDo not want to change existing network. Can be a temporary solution
The better users feeling cost much.
Staged Construction Introduction
Scenario Aim to some areas are hard to upgrade 2G or takes long time, during the construction adopts
staged construction method
Implementation Phase I: no sufficient condition to upgrade, can not implement cell re-selection. Through PLMN
selection to implement
Phase II: with sufficient condition to upgrade, adopts cell re-selection to implement
Advantages This solution fully considered the ad- & disadvantage of each solution
No upgrade in the initial stage to launch the service. User just need to change SIM.
Dual mode UE will select 3G network by implement HPLMN reselection
Disadvantage When user back to 3G, the procedure may persist 6 minutes
2G BSC need to upgrade to support 3G measuring & configure 3G neighbor cell info. to support
Cell reselection
Solution DescriptionSolution Description
3G Service Guarantee Strategy3G Service Guarantee Strategy
User 3G Prior Selection
2G/3G Service Inter-connection
3G Service Continuity
2G/3G Inter-connection in the Belonging Network
GSM coverageGSM coverage
WCDMA coverageWCDMA coverage
GSM CNGSM CN
GSM MS GSM MS WCDMA UE WCDMA UE
RNCRNC
WCDMA CNWCDMA CN
BSCBSC
2G/3G Inter-connection in the belonging network is a basic function
2G CN & 3G CN can through the Gateway to realize the calls forwarding. 2G/3G CN element can be used in one CN.
Roaming Users Inter-Connection
GSM CoverageGSM Coverage
WCDMA CoverageWCDMA Coverage
GSM CNGSM CN
WCDMA UE1
WCDMA CNWCDMA CN
BSCBSC
WCDMA UE2 WCDMA UE3
RNCRNC
GSM MS
3G roaming to GSM and inter-connect with 3G user through WCN
2G CN and 3G CN can inter-connect through Gateway. 2G/3G CN element can be used in one CN.
Other Services Inter-connection
Intra-system HO: voice & PS; SMS inter-connection and even under roaming; PS service and even under roaming, such as MMS, Java,
Internet browser;
BOSS for 3G services opening; OMC; Pre-paid/post-paid 3G users charging and even under roaming.
2G/3G inter2G/3G inter--connection will also include: connection will also include:
Summary to Inter-connection
Item Description Existing NE 3G NE
Roaming
1)3G roaming to 2G; (User not in 3G coverage)
2)2G roaming to 3G; (2G MNP to 3G)
3)After local authentication, the auth. will also be implement between multi-area/operators
MSCVLR;HLR;STP
MSCServer;HLR
Call
1)3G user in 3G coverage to origin/terminate calls (the other side is 2G or other network user)
2)3G roaming to 2G, do the upper procedure
3)2G roaming to 3G, do the upper procedure.
MSCVLR;HLR;STP;TMSC;GMSC
MSCServer;MGW;HLR
Intra system HO
1)CS accomplishes 3G to 2G voice HO
2)PS accomplishes dual direction re-selection and HO
MSCVLR;BSS;SGSN;GGSN
MSCServer;MGW;RNS;SGSN;GGSN
Summary to Inter-connection (Cont.)
Item Description Existing NE 3G NE
SMS1) User can proper have SMS process in 3G
2) 3G roaming to 2G can process SMSMSCVLR;STP;HLR;SMSC
MSCServer; HLR;SMSC(canshare)
Account opening
1) Existing users can modify preference to 3G and use 3G service
2) New users to 3G directly
3) Through OTA to broadcast PS parameters
BOSS;Javaplatform
HLR;
MMS1) User can proper have MMS process in 3G
2) 3G roaming to 2G can process MMSSGSN;GGSN;WAP;MMSC
SGSN;GGSN;WAP;MMSC(all can share)
Other VS CRBT, Portal, Java can be proper processed Related NE Related NE
Pre-paid Proper charging in upper listed scenario SCP;SMP GSN;MSCServer;
Post-paid Proper charging in upper listed scenario Billing centre Billing centre
OMC OMC connects with 3G-OMC OMC OMC
3G Service Guarantee Strategy3G Service Guarantee Strategy
User 3G Prior Selection
2G/3G Service Inter-connection
3G Service Continuity
3G Edge Coverage & Inter-operation Strategy
CS
PS
Keep in 2GHO to 2G
HO to 2G
HO to 3G
Idle: realize dual direction cell reselection in the edge of coverage.
On the call: 3G to 2G HO in the edge. When back to 3G still use 2G
On the Video call: drop to the voice call PS Connection: in the edge to realize dual direction
HO (If it is PLMN solution, 2G to 3G will keep in GPRS) Simultaneous service: 3G to 2G only voice HO
Dual direction re-selection in Idle mode
WCDMA coverageWCDMA coverage
GSM coverageGSM coverage
Inner 3G Coverage Inter-operation Strategy
2G coverage
3G coverage
In the 3G initial stage, due to the limitation of investment and others, there may be some weak coverage area such as in the metro, tunnel, elevator, basement etc.
The 3G from 2G upgraded users may meet the call drop, worse quality etc. will affect 3G experience.
Solution 1: full & better coverage, construct a best covered network
Solution 2: configure 2G/3G handover & reselection, adjust the trigger parameters to reduce Ping pong effects.
2G Success Transfer Strategy2G Success Transfer Strategy
MNP Solution
Service Integrity Solution
Number Portability Under Same Network Code - ARD
2G/3G HLR upgrade, add information tag : HLR should add control information tag: ARD Access Restriction Data to indicate
user access preference and control the 2G/3G user access During the position updating, ISD procedure will send ARD to MSCS/VLR
MSC Server/VLR distinguish the accessing network : VLR will distinguish the accessing network is 2G BSS or UTRAN VLR according the radio network preference and ISD sent ARD to define relation
between user and access network preference like:
RequestRequest ARDARD ARDARD valuevalueAccessing Accessing
networknetworkScenarioScenario
Refused GREAN Allowed, UTRAN Not Allowed 01 3G UTRAN 2G user want to in 3G
Accepted GREAN Allowed, UTRAN Allowed 00 3G UTRAN 3G user uses 3G
Accepted GREAN Allowed, UTRAN Not Allowed 01 2G BSS 2G user uses 2G
Accepted GREAN Allowed, UTRAN Allowed 00 2G BSS 3G user want to in 2G
Dual-Mode UE Smooth Transfer No Change of SIM and Number Phase 1: Transfer to 3G but still use 2G service
To transfer 2G to allow the access of 3G but keeps register info. and still use 2G service
The transfer speed in controlled by operator; to use 3G resource and offload 2G loading
Will ensure 3G network stability with lowest risk to find 3G network problems
Phase 1: User request to 3G
To the upper state users, when they request to 3G they will be a real one right now
For the dual mode UE, user will be allowed to use 3G
For the non dual mode UE, only when they change their UE they will be allowed to use 3G
SIMSIM
USIMUSIM
2G
3GMessagingVideo Call
Picture/Ring Java App
TV/Video
MMS
2G Success Transfer Strategy2G Success Transfer Strategy
MNP Solution
Service Integrity Solution
Integrity After User Transfer to New Network
WCDMAWCDMAGSMGSM
Existing HLR
When the prior 3G and MNP solved, 2G can camping in 3G to realize the call & SMS function
Existing HLR capability will determine whether the video calls, higher data rate/QoS PS services are available (Mobile TV, VOD)
Existing Billing system will charging the usage of video calls, higher data rate/QoS PS services
Billing SCP
2G/3G Merge Strategy
2G Resource Merge & Utilization
2G/3G Equipment Inter-operation
2G/3G Merge Preparation Suggestion
2G/3G Merge Strategy
2G Resource Merge & Utilization
2G/3G Equipment Inter-operation
2G/3G Merge Preparation Suggestion
Deep Research to Current GSM Status
Make a GSM sites statistic, including the site circumstance, height of the building,
antenna position, shelter position, shelter free space, transmission resource, power,
feeder tray, monitoring and the pole/tower etc.
Consider if the current radio and core network does support 2G/3G inter-operation and
voice handover. If the HLR supports ARD, multi-PLMN (or SRF) function and if it
supports 3G service register.
Study the current IN, Service platform and gateway to find if they support 3G pre-paid,
new service charging and how much the service platform hardware can be shared.
And if the gateway supports video call forwarding and its free redundant resource.
Study the OMC, Billing and BOSS systems and find if they support 3G service
management, account opening and charging. And its redundant.
For the 3G transmission planning, we should make a statistic of transmission
redundant, interface redundant etc.
Demo Test of 2G to 3G Evolution
Test of 3G prior selection: including cell re-selection, PLMN selection, staged construction, etc.
Test of 2G/3G inter-connection: including the roaming, calls, sms, handover, IN service, PS service, Billing, OMC, BOSS, etc. And also the compatibility to the other vendors equipment (aim at voice handover, the proof of 3G adapting HO and 2G upgrade HO is recommended)
Test of service continuously: internal the 3G coverage and the margin of coverage. Tests the multi-services HO results.
Test of Number portable: including the ARD, multi-PLMN and MNP solution Test of service integration: beginning of the test, 3G as the network sharing to
reduce 2G load, the dual-mode terminals are camping in the 3G network but still using 2G service. Only after the HLR register, they will start 3G service browsing.
Summary
2G/3G network merging strategy should based on the reusing of network resource and
ensuring customer experience: co-site, share the transmission, facilities reusing and 2G to
3G transferring.
To realize the convenient 3G prior selection (cell reselection, PLMN selection, staged
network construction), 2G/3G inter-connection, 3G service continuous, cancelling MNP
effects etc.
2G MNP solution is different when they in same or different MNC. ARD will solve this in
same PLMN. Different MNC has other solutions such as multi-PLMN and MNP. Besides,
HLR will also be the limitation to the 2G MNP subscribers using 3G service.
2G/3G inter-connection has many limitations, only when the existing network has been
deeply studied, the network can be upgraded smoothly.
ZTE 2G/3G Network Merging StrategyAbstract2G/3G Merge Tasks3G Prior & MNP With Potential Problems2G/3G Merge Principle Suggestion2G/3G Co-site2G/3G Transmission Sharing SDH Based2G/3G Transmission Share Shunt TransmissionUnified 2G/3G CN (CS/PS)3G User Prior Camping in 3G NetworkUpgrade Network Cell ReselectionCell Reselection PrincipleCell Reselection Requirement to 2G EquipmentNo Network Upgrade PLMN SolutionPLMN PrincipleComparisonStaged Construction Introduction2G/3G Inter-connection in the Belonging NetworkRoaming Users Inter-ConnectionOther Services Inter-connectionSummary to Inter-connectionSummary to Inter-connection (Cont.)Inner 3G Coverage Inter-operation StrategyNumber Portability Under Same Network Code - ARDDual-Mode UE Smooth Transfer No Change of SIM and NumberDeep Research to Current GSM StatusDemo Test of 2G to 3G EvolutionSummary