ZTE_2G3G Networking Strategy

2G/3G Networking Strategy

Agenda

• 2G/3G Networking Strategy Overview

• 2G/3G Networking Solution

• Summary

By March, 2008, about 220 WCDMA commercial networks are deployed worldwide. Among them, there are 198 HSDPA commercial networks and 34 HSUPA networks.Number of HSPA users reaches 7.25 million. Informa predicts it will hit 56.8 million by the end of 2008.0.6 billion wireless users are expected by 2010.

Quick Development of WCDMA

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Construction StrategyConstruction Strategy

Key Region

GSM900+DCS1800 GSM900

Entire Coverage

Blank

Key Region

WCDMA/GSM900+DCS1800/GPRS GSM900/GPRS

Entire Coverage

Blank

Continuously improvement of coverage, creating a unified 2/3G network brand;gradually propel GPRS upgrade, enhance entire coverage data service;WCDMA/HSDPA construction in key regions, GSM as supplementary;

Continuously improvement of coverage, creating a unified 2/3G network brand;gradually propel GPRS upgrade, enhance entire coverage data service;WCDMA/HSDPA construction in key regions, GSM as supplementary;

WCDMA Cooperating with GSM Network

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CN shared physically; 2G/3G wireless networks are independent physically.Construct a unified platform for network management and service, 2G/3G operate together.

GSM&WCDMACore NetworkGSM&WCDMACore Network

WCDMA RNC

GSM BSC

WCDMA Node B

GSM BTS

2G/3GUnified Network

Management

2G/3GUnified Service Platform

GSM & WCDMA RANs Overlay CN shared Service Shared

Rapid 3G deployment is possible via sharing CN, service platform and O&M system.3G Node B shares site resources, transmission resources and related auxiliaries with 2G BTS to reduce the construction investments.

Iu

AAbis

Iub

Overlay Solution with GSM

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Agenda



• Summary

2、How to realize better frequency utilization?

1、How to construct a better 3G with lower TCO ?

4、How to resolve subscriber camping?

5、How to realize better subscriber experience?

6、What’s the requirement on the existing GSM?

3、How to keep smooth evolution to future?

Inter-workingInter-working

RANShareRANShare

Key Issue

2G/3G Networking Solution

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Study 2G sites and make a statistic of free

space, power redundancy, transmission

redundancy, tower condition, etc.

Make a reasonable and suitable planning

according to each site & 2G traffic

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

GSM Infrastructure Sharing – Traditional

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More and more frequency bands are available and standardized;

Since the wireless bandwidth demands increase rapidly, operator is eager to find

more frequency resources;

SDR Base Station can support Multi-Frequency and Multi-Standards co-existence.

RRU

Transmission

Physical Cards O&MBBU

Transmission Power

GSM Infrastructure Sharing – SDR Based

Antenna Feeder

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One RRU supports multi modesOne RRU supports multi modes

Cellular band AWS band 700M band

BBU Sharing

RRU

900M Band 1.8G Band 2.1G Band

GSM/WCDMA/CDMA1X/EV-DO/TD/WiMAX/ LTE Baseband Board

BBU supports multi modes;

BBU supports various frequency bands.

BBU supports multi modes;

BBU supports various frequency bands.

Different Frequencies Same Frequencies

Base Station Sharing

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Feeder

Iub/Abis

RNCRNC

BSCBSC

Fractional E1 SolutionFractional E1 Solution

BTSBTS

Node BNode B Fractional E1 (N*64K)

Fractional E1 to implement 3G ATM/IP and 2G TDM in a physical line to save E1/T1. BTS & Node B in same room and 2G has redundant transmission resource. 2G & 3G have Fractional E1 function. If it is not supported, TS exchange equipment will implement it.

TS exchange TS exchange

SDH

at the initial stage, 2G have had redundant transmission, 3G accesses to transmission through 2G. With the 3G traffic expands & 2G shrinks, 2G accesses to transmission through 3G.

Transmission Sharing

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RANShareRANShare

Key Issue


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With GSM users turn to 3G gradually, existing GSM 900M and 1800M spectrum resources could be used after frequency reframing.For WCDMA, 900MHz has wider coverage and less interference compared with 2.1GHz, applicable for WCDMA wide coverage in some cities and suburbs. With HSPA/MBMS etc more mature in commercial application, 900M/1800M extended frequency band will definitely expand its application.

2007 2009 2010

GSM 900

WCDMA 2.1GHz WCDMAWith

BBU+RRU

GSM 900

WCDMA 900X *5MHz

Dual-mode RRU

2008

Dual-mode BBUHSPA+

2.1GHz

900MHz

Software upgrade

GSM 1.8GHz GSMWith

BBU+RRUDual-mode BBUE-EDGE

1.8GHz

Frequencies Utilization Strategies

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UMTS 900M has wider coverage, higher data throughput :

Guard Band2.2~2.5MHz

UMTS Carrier

GSM Carrier

Compared with UMTS2100M:UMTS900M cell coverage increases above 60％;

UMTS900M data throughput increases above 20％

UMTS900M network construction cost saved above 60％

Advantages of UMTS 900M

2100 2100

Coverage Comparison between 900M and 2100MHz

UMTS Network

Band Separation

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GSMGSMGSMGSMGSMGSM

GSMGSMGSMGSM

GSMGSM

UMTS UMTS

UMTS

UMTS

UMTS

UMTS

Software Configurable

Software Configurable

Transmission power can be allocatedflexibly between carriers.

Flexible Transmission Power Allocation

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VOICEGPRSEDGE

GSM 1800

GSM 900

weak radio traffic

datatraffic

strong radio traffic

Less data traffic

Less voice traffic

=> Less spectrum requirement

VOICEPS Data

UMTS 2100

UMTS 900

weak radio traffic

datatraffic

strong radio traffic

Less data traffic

Less voice traffic

=> Less spectrum requirement

Traffic Balancing Strategy

GSM 1800 and UMTS 2100 dominate at service providing.GSM 900 and UMTS 900 dominates at coverage, providing less data traffic and less voice.Benefits: enhanced coverage, less sites deployment.

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RANShareRANShare

Key Issue


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Standards Evolution

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2G 2.5G 2.75G 3G 3.5G 3.75G 3.9G

GPRS EDGER99

E-EDGER7

HSDPAR5

HSUPAR6

MBMS (FDD)

4G

MC-HSPAMBMS (TDD)

cdma 2000EV-DO

802.16 e 802.16 m

HSPA

HSPA+R7/R8

TDD

FDD

4G

GSM

TD-SCDMA

WCDMAR99

802.16 d

cdma 1x cdma 2000

LTE

EV-DORev. A

The Future is multi-technologies and multi-standards co-existence.The networks based on traditional solution are separated.How to Share infrastructure, transmission, processing resources,

feeder system and transmit power is a big challenge.

Support multi-standard co-existence;Support multi-frequency bands co-existence; Support multi-network technologies convergence.

FDD

TDD

LTELTEGSM/EDGEGSM/EDGE

WCDMAWCDMA

TDTD--SCDMASCDMA

UMBUMB

802.16m802.16m

CDMA2000CDMA2000

802.16e802.16e

4GIMT-Advanced

OFDMBased

Technology

4GIMT-Advanced

OFDMBased

Technology

Mix of flat and non-flat architecture.

Common Timing, Power, Control, and

Clock Interface.

Common RF Providing

Distributed and Centralized combination.

Legacy and B3G Capable.

Components shared

Baseband Card shared

Unified Platform Meeting Standards Evolution

Platform Features:

Platform Benefits:

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GSMUMTS

TD-SCDMA

LTELTEWiMAXWiMAX UMBUMB

G/W/C/L/W BB

RURU

Evolution

2008

2010

2006

RURU

RURU

RURU

RURU

RURU

MicroTCA platformMicroTCA platform

CDMA/CDMA 2000

Multi - Standard Unified Platform Multi - Standard Unified Platform GSM, UMTS, CDMA/ CDMA2000, WiMAX, LTE in one cabinet.

RU module shared and software configurable.

Baseband shared and software configurable

Platform Smooth Evolution Capability

Support Multi-standard and Multi-frequency Networks evolution simultaneously

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Control, switch, power, and interface boards are shared;

GSM and UMTS only need software upgrade to support new features

GSM and UMTS support smooth evolution to LTE.

Smooth Evolution for Multiple Standards

GSM 900MHz

ZTE SDR Base Station

GSM 900MHzUMTS 900MHz

GSM 900MHzUMTS 900MHzLTE 900MHz

GSM 900MHzUMTS 2100MHz

GSM 900MHzUMTS 2100MHzLTE 900/2100MHz

1. SW & Min. HW upgrade 2. SW & Min. HW upgrade

2100MHz RU2. SW & Min. HW upgrade1. SW & Min. HW upgrade

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RANShareRANShare

Key Issue


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Key AreasKey Areas Valued AreaValued AreaEntire CoverageEntire Coverage

GSM/GPRSGSM/GPRS WCDMAWCDMA HSDPAHSDPA

Enlarge GPRS/GSM coverage to attract low-end user, offering consecutive voice and low-speed data service.

Continuous covering for WCDMA key areas to absorb traffics. Develop medium/high-end user by dual-mode UE and world roaming service.

HSDPA in valued areas to improve core competitiveness, attract medium/high-end user, especially in CBD and hot spot areas.

HSDPA: palm broadband (high-speed data service

WCDMA: voice/ video phone/low&medium-speed data service

GSM/GPRS: voice/low-speed data service

Valued areaValued areaKey areaEntire network

coverage

Multi-Layer Mobile Networks

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3G service prior principle: consistency of user experience from 2G to 3G, 3G

user has priority to enjoy 3G service.

3G construction low TCO: fully reuse the existing 2G network to reduce 3G

construction investment in initial phase.

Less upgrade Requirements: try to avoid upgrade and alteration on existing 2G

network, reduce handover between systems as possible.

Network construction is a phased process, traditional GSM operators can hardly make

national coverage, one-time in initial phase of WCDMA network construction, there

must exist a GSM-WCDMA co-existing period to ensure continuity of user service and

consistency of user experience by 2G-3G inter-working. 2G-3G inter-working should

abide by the following rules:

How to Guarantee 3G subscriber Camping 3G network?

GSM&WCDMA Inter-working Strategy

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WCDMAWCDMAGSMGSM

WCDMA－>GSM：

Cell reselection to be realized, support CS & PS HO.

GSM－>WCDMA：

HPLMN reselection to 3G when in idleNo CS HO or PS HO

GSM & WCDMA should be diff. MNC;

WCDMA Users need new USIM with WCDMA

network as HPLMN.

AdvantageNo upgrade to GSM

Less combining debugging to GSM & WCDMA

DisadvantageTransfer from GSM to WCDMA needs to change SIM

HPLMN reselection spends 6 minutes, degrading user

experience

RequirementRequirement

Option I - PLMN Reselection Solution

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WCDMAWCDMAGSMGSM

WCDMA－>GSM：

Cell reselection, voice & PS HO

GSM－>WCDMA：

Cell reselection back to 3G in idleNo 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

AdvantageUser do not change SIM & number

Fast action from 2G back to 3GDisadvantage

GSM should be upgraded to support 2G->3G cell

reselection

Abundant upgrade tasks

The main stream solution chosen by operators

Option II - Cell Reselection

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RANShareRANShare

Key Issue


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2G RAN

3G RAN

If no restrictions in core network, all GSM/UMTS dual-mode mobile terminal

can camp on UMTS network, and possibly this will worsen UMTS KPI.

Dual-mode mobile terminal can be under control to better 3G network camped

subscriber experience.

Dual Mode MT

2G

3G

Video Call

Java AppMMS GSM MT

Check Point

No SIM Card & No MSISDN Change

GSM Terminal onlyDual Mode Terminal, with 3G subscription in HLR

Dual Mode Terminal without 3G subscription

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2G/3G HLR upgrade, add information tag:HLR should add control information tag: ARD (Access Restriction Data) indicates user access preference and controls the 2G/3G user accessDuring the Location Update procedure, ISD MSG will send ARD to MSCS/VLR

MSC server/VLR distinguish the accessing network:VLR will distinguish the accessing network is 2G BSS or UTRAN According to the radio network preference and ISD sent ARD, VLR defines relationship between user and access network preference.

HLR Subscription StatusHLR Subscription Status ARDARD valuevalue Accessing network Accessing network ResultsResults

Dual Mode Terminal, with HLR Subscription 01 3G UTRAN Attach Successful

Dual Mode Terminal, without HLR Subscription 00 3G UTRAN Attach Rejected

How to discriminate 2G & 3G user?

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CS

PS

Keep in 2GHO to 2G

HO to 2G

HO to 3G

Idle: dual-direction cell reselection in cell edge. Voice call: 3G to 2G HO in cell edge, while back to 3G, still use 2G resource;Video call: transfer to voice call in cell edge;PS data: dual-direction HO in cell edge. (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

GSM Coverage

UMTS Coverage

Smooth Handover between GSM & UMTS

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RANShareRANShare

Key Issue


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Target: construct all-IP 2G/3G Single core network,

BSC

MSC Server

GGSN

2G/3G HLR

RNC

BSC

MGW SGSN

HLR：

Shared HLR ensures 2/3G users smoothly

migrate, and realize user data convergence

MSISDN mixed between GSM & UMTS;

Packet Domain：

Shared SGSN and GGSN, realize packet

domain integrated access

Support 3G

Support 2G/3G inter-working

GSN in Pool and Evolution optional.

Requirements on CN

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BSC

MSC Server

GGSN

2G/3G HLR

RNC

BSC

MGW SGSN

PLMN Reselection：

GSM RAN needs no upgrade

Cell Reselection：Support broadcast to re-set cell

reselection threshold

3G neighbor cells will be added.

Target: smooth handover for better service experience

Requirements on GSM RAN

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Agenda



• Summary

UMTS network construction should Be cooperated with the existing GSM;

Be capable of smooth evolution;

Enhance frequency utilization;

Save CAPEX and OPEX maximally.

Keep SIM cards unchanged;

Support smooth handover/cell reselection with the existing GSM;

Improve subscriber experience.

Possibly existing GSM needs upgrade

Summary

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Documents

ZTE_2G3G Networking Strategy