CDMA 1x and EV-DO Network Enhancement

China Telecom

Wang Yuezhen

2012.06.14

中国电信广州研究院

CTC Have a Great Success with CDMA

Users grow 5-folds in the last 3 yearsUsers will be double In the next 3 Years

2008 2009 2010 2011 2012 Mar. 0

20

40

60

80

100

120

140

Mobile Subscribers (Million)

中国电信广州研究院

Limited spectrum becomes the bottleneck for further growth.

37 78 119 160 201 242 283

CDMA UL825 835

CDMA DL870 880

MS Tx f=0.03N+825 MHzBS Tx f=0.03N+870 MHz

MHz

How to improve capacity with limited spectrum?

CTC Have a Great Success with CDMA (cont,)

中国电信广州研究院

Network Enhancements

1x Network Enhancement

EVRC-BQLICMRDEarly TerminationNew PC ModeEVRC-NWSmart BlankingQOFRLIC

DO Network Enhancement

NLBSCMDNSSCMLMulti-AT Paging……

Phase I

Phase II

Completed

In progress

In progress

中国电信广州研究院

Network Enhancement Effects

1x Enhancement Phase I Features• EVRC-B(COP4) capacity gain: 20%~30%• QLIC FL capacity gain: >30%, generally 50% and

above• MRD FL capacity gain: environment impacts the MRD

gain mostly, two sample results is 56% , 158%

1x Enhancement Phase II Features• FL capacity gain: 130-140 % with all features , except

for MRD; 40-50% , if EVRC-B/EVRC-NW,QLIC are excluded;

• RL capacity gain: ~90% (New AT,RC8); ~80%, (Legacy AT,RC3)

• ET and RLIC are key features to improve capacity in FL and RL respectively

中国电信广州研究院

Deployment Strategy

1.EVRC-B • Network: Software Upgrade• Supported AT :Many

2.QLIC • Network :No Change• Supported AT :Some

3.MRD • Network :No Change• Supported AT :Few

4.SB,ET ，

EVRC-NW ，

New PC Mode, QOF, RLIC

• Network: Software and Hardware Upgrade• Supported AT :New, Few

5.NLB SCM

• Network: Software Upgrade• Supported AT : all Legacy

Deployment, 2011 Hot Spots

Mandatory

Optional

Plan to Do Field Trial in 2012 Q3

Under evaluation

中国电信广州研究院