12_ZTE 2G3G Network Merging Strategy_V3.30_200805

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 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 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

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

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 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

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

12_ZTE 2G3G Network Merging Strategy_V3.30_200805

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Transcript of 12_ZTE 2G3G Network Merging Strategy_V3.30_200805