Consideration on the future
development of mobile service
Zhang Dongchen
China Mobile Communication Corporation, China
March 2011
Contents
The Network Development of China Mobile
Considerations on Spectrum Insufficiency
of IMT
2
The development of mobile service in China
 In the past decade, mobile communications have been growing rapidly in
China, which makes a strong impact on our daily lives
Fixed telephone users
Mobile telephone users
The proportion of mobile telephone users
The growth rate of mobile phone in every month
 By the end of 2010, the total number of national telephone users has reached
1153.39 million.
 The number of mobile telephone users has reached 859 million
 The number of 3G users has reached 47.05 million
 The mobile tele-density in China is: 64.4 telephones /100 people
3
GSM and TD-SCDMA network
 As the largest telecom operators in the world, China Mobile
has played a very important role in the development of mobile
service in China
 The world's largest GSM network
 More than 500,000 GSM Base Stations
 More than 580 million users
 Continued expansion in TD-SCDMA
network coverage
 Covering 656 cities with 135,000 base
stations in operation at the end of 2010
 Steady growth of 3G users:
22.636 million at the end of Jan 2011
4
The development of TD-LTE network
 TD-LTE is China Mobile’s future
 Successful TD-LTE demonstration during Shanghai World Expo
世博中心
演艺中心
中国馆
主题馆





Coverage: 5.28 square km
Data rate: 70Mbps
Outdoor BS: 17
Indoor coverage system: 8
Operating band: 2.3GHz
世博轴
 Successful TD-LTE demonstration
during Guangzhou Asian Games
 Provide service such as high definition
broadcast, mobile video monitoring, 3D
games and high-speed Internet access etc
Users are enjoying various high quality
mobile broadband services
5
The development of TD-LTE network
 Trials are ongoing in China
Lab Test: all system testes have been finished by Jan. 2010
Field Test: finished by the end of 2010
Results show networking capability starts to be supported
Field Trial:
4 Vendors
Lab Test:
9 Vendors
Beijing
Nanjing
Shanghai
Hangzhou
Xiamen
Shenzhen
Field Trial:
5 Vendors
Beijing
 Large-scale pre-commercial trial will
be carried out in 6 cities this year.
 Will deploy more than 3600 basestations by the end of this year
 Operating band: 2.6GHz&2.3GHz
Guangzhou
6
Service provided by multiple networks
 The traditional voice service is mainly carried by GSM network, and will
grows steadily in the future
 value-added data service will mainly carried by TD-SCDMA and future TDLTE network
 The income of data service has increased very rapidly due to the application
of smart terminal and increase in mobile network bandwidth
7
Service provided by multiple networks
Data traffic becomes driving force for the growth of value-added business revenue
8
The problem of spectrum insufficiency
 As the traffic capacity of mobile communications, especially the data
traffic, increased rapidly, the spectrum of IMT is increasingly
insufficient
Traffic trends of mobile communication
•Constructing and operating multiple networks at the same time
will further aggravate spectrum insufficiency
9
Solution to the spectrum insufficiency
 Method 1: Network optimization
Technical Method
Improve network capacity by
narrowing the distance between BSs
the distance between some base stations
in urban is less than 200 meters
Maximum the network
potential by automatic
frequency optimization
It has been widely adopted in
China mobile’s network
Further improvement of current network is limited
10
Solution to the spectrum insufficiency
 Method 2:
Accelerate the frequency arrangement for implementation of IMT
being arranged
ITU region 1
450 470
790 862 960
has been arranged
1710
2025
2110
2200
2300
2400
2500
2690
3400
3600
1710
2025
2110
2200
2300
2400
2500
2690
3400
3600
1710
2025
2110
2200
2300
2400
2500
2690
3400
3600
ITU region 2
450 470
698
806
960
ITU region 3
450 470
698 790/806 960
ITU-R will finish the arrangement of IMT spectrum allocated at WRC07 in 2011
This is a very effective method which can obtain obvious effect in a short period
11
Solution to the spectrum insufficiency
 Method 3: Acquire more frequency spectrum for IMT
requirements
ITU forecast on the spectrum requirement in the future
（
MHz
and before
）
2010
2015
2020
2010
2015
2020
（a) Developed area for mobile service (b) Developing area for mobile service
According to the prediction from ITU, the requirement for mobile service frequency will be
around 1300MHz.
At present, only about 1100MHz spectrum identified for IMT, still has hundreds of MHz frequency
gap
Although this method will take a long time, it is the basic and most effective solution to fulfill
the frequency requirement in the future
12
Solution to the spectrum insufficiency
 Method 4: Some spectrum efficiency enhancing techniques
698-806 f-band ave power
-50
-55
-60
ave power [dBm]
-65
-70
-75
-80
-85
-90
-95
-100
Frequency occupancy status in GSM 900
700
710
720
730
740
750
760
Frequency [MHz]
770
780
790
800
Frequency occupancy status in 698-806MHz
 Some techniques to enhance spectrum efficiency, i.e. SDR &CRS,
are studied.
 Considerations:
QoS of IMT service should be guaranteed sufficiently when the new
techniques are implemented
Some time, supports from administrative policy are needed
Cannot solve the issue in recent years.
13
More spectrum to unlock the constraints on IMT development!
14