Network deployment Solution for
Evolution from 3G to TD-LTE
China Mobile
April. 2012

1Outline
1. TDD Spectrum Allocation
2. Evolution from 3G to TD-LTE
3. Field Trial Results of Upgrading solution
4. Future Plans

2

TDD Spectrum for China Mobile

No.

Frequency

Range

ModeA

2.0G

2010-2025MHz

TD-SCDMA

F

1.9G

1880-1920MHz

TD-SCDMA/TD-LTE

E

2.3G

2320-2370MHz

TD-SCDMA/TD-LTE

D

2.6G

2570-2620MHz

TD-LTE•

Equipments with 1.9G/2.3G has been widely deployed around China•All these sites support upgrading to TD-LTE•

Most of TD-LTE macro coverage can be provided by 1.9G•

2.6G will focus on TD-LTE capacity requirement

3Global 1.9G TDD Spectrum Allocation
RussiaB33

Europe
B33

China
B39

JapanPHSKorea
B39
Middle East
Vietnam B39
B33
Sri Lanka Malaysia
Singapore
B33
B33
Australia
B33

 Band 39: 1880~1920MHzBand Band 33: 1900~1920MHz
Definition  PHS: 1884.5 -1919.6MHz

4

Evolution from 3G TD-SCDMA to TD-LTE•

Network infrastructure evolution
TD-SCDMA
Iub
NodeB

Iu

TD-LTEeNodeB

Core network

RNC

Iub
NodeB

SGSN

S1X2

Core network
MME/S-GW

S1eNodeB

RNC eliminated in TD-LTE network, related function integrated to eNodeB•

Base Station Products
 Most of TD-SCDMA products
are distributed BBU+RRU
RRU TD-LTE will also deploy distributed
macro basestation at initial stage
RRU
All-in-one
micro

BBU

BBU

Evolution from TD-SCDMA to TD-LTE based on distributed BBU+RRU mostly
5Upgrading Solution for 3G Base station•BBU• Common hardware platform for TD-SCDMA and TD-LTE• TD-LTE baseband card deployed in the existing TD-SCDMA BBU• GPS、Backhaul、Power supply are shared

TD-SCDMA/TD-LTE BBU•Dual mode RRU

RRU• Software upgrading， supporting TD-SCDMA/TD-LTE at the same time
• Bandwidth、RF perfermance、output power meet dual mode requirements
FrequencyBandwidthMode

Typical Configuration

1.9G30/35M

Dual mode or
TD-LTE only

(20M TD-LTE+ 10M TD-SCDM) or 30/35M LTE

2.3G

50M

Dual mode or
TD-LTE only

2*20M TD-LTE+ 10M TD-SCDMA6

Upgrading Solution for Antenna• 1.9G Evoluation– More than 90% TD-SCDMA 8-antenna support 1.9G already– No change needed for antenna and cable• 1.9G + 2.6G deployment– FAD antenna ready since 2011, supporting 1.9G+2.0G+2.6G– Combiner inside for 1.9G RRU and 2.6G RRU
1.9G + 2.6G
deployment

1.9G Evolution

AFDAF

1.9G+2.0G

1.9G+2.0G+2.6G
RRU

TD-S/TD-L
dual mode RRU

Combiner
insideRRU

1.9G

RRU

2.6G7

3G network Upgrade to TD-LTE is Verified• Field trial information– Test location: Guangzhou, Shenzhen, Hangzhou– Base station construction: upgraded from and co-equipment with TD-SCDMA– System configuration: DL:UL=3:1; DwPTS:GP:UpPTS = 3:9:2– Terminal: CPE, CAT4HangzhouGuangzhou
Shenzhen83G network Upgrade to TD-LTE is Verified• Test results– Peak throughput: 81.7-85.1Mbps, about 90.8%-94.6% of theoretical value– Cell throughput: 47.1Mbps (70% loaded), about 52% of system maximum capacity– Latency: User-Plane ~20ms, C-Plane ~86ms, agreeing with system design target– Network KPI:
Attach Success Rate

98%-100%

Call Setup Success Rate

98%-100%

Paging Success Rate

100%

Handover Success Rate

99%-100%

Call Drop Rate

0-1%

– No obvious performance degradation to existing 3G networks• Conclusions– Both TD-LTE and TD-SCDMA can work well after upgrade– Upgrade from TD-SCDMA is an efficient method to setup TD-LTE network91.9G/2.6G Propagation Loss Comparison
Conclusion from field test:
1.9G coverage performance is 2.3dB ~ 8.3dB better than 2.6G
CDF of 1.9G/2.6G Propagation Loss difference
OutdoorCoverage difference

IndoorCoverage difference

Los

NLos

2.9dB

4.5dB

Shallow area

Deep area

4.9dB

7.8dB
Los
NLos
Shallow area
Deep area
Average

Difference ( dB )Outdoor
OutdoorIndoorIndoor101.9G Industry Progress
Infrastructure Products•

3 vendors’ 1.9G RRU/BBU have been widely deployed in China，
supporting 3G/TD-LTE dual mode•

Another 3 vendors will released 1.9G commercial products by 2012Q3

1.9G

1.9GTerminls•

1.9G MiFi is on commercial operation in Zhejiang, China•

7 chipsets&terminal vendors will release 1.9G data card by 2012Q311

Commercial Activities in China
Target: Full coverage in most cities
1.upgrade from 3G TD-SCDMA BS
2.build new TD-LTE BS

2012
20k base stations, 9 cities

2013
200k base stations, Major cities•Commercial multi-mode terminal, smartphone•Converged LTE TDD/FDD enables global roaming

12