Transcript Document

Recent Advances of
Communications
Technology in China
CHEN Junliang
State Key Laboratory of Networking
and Switching Technology
Beijing University of Posts and
Telecommunications
August, 2007
Main Contents
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Current Situation, Prospect and
Challenge of Communications Networks
Optical Transmission system
3G and 4G Mobile Communication
Systems
Next Generation Internet
Next Generation Networks
Current Situation,
Prospect and
Challenge of
Communications
Networks in China
Optical Transmission
System
Outline
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Length of optical cable
Development of optical communication
technology
National “863” / O-TIME Program of
China
National “863” / 3T-Net Program of
China
Introduction to typical demonstrations
Future prospect
Development of optical communication
technology
Direction 1：Ultra high-speed, large capacity, longdistance transport platform
Direction 2: Intelligent, multiple-service and
converged carrier platform
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4,000,000Km optical fiber laying in China
160×10Gb/s、80×40Gb/s DWDM system
applied in optical network
ULH/WDM ultra long-haul optical
transmission device and system already
commercialized
ASON, MSTP deployed in MAN
(Metropolitan Area Network)
EPON applied in more than 20 cities,
demonstration of FTTH already applied
Multi-service driven optical access and
switching has been the focus of research
and popularization
National 863/O-TIME Program
O-TIME（Optical Technology for Internet with Multi-wavelength
Environment）plan is the national “Tenth five years' project” 863
program’s research plan for optical communication technology -“Optical TIME” program. (2001-2005)
Typical characteristics of O-TIME program: Aiming at the trends and needs of
broadband information network and optical communication technology,
research on optical wavelength technology supporting Internet multiwavelength transmission, taking breakthrough in the four key high
technologies to provide Internet with high-speed, broadband, flexible,
efficient and intelligent physical transport platform:
Ultra long-haul optical transmission
Node optical switching
Broadband optical access
Intelligent optical interconnecting network
National “863”/O-TIME program roadmap
Interconnecting, Test,
Key tech, Key module,
Milestone achievement
Experimental system
2001
2002
2003
2004
2005
Design、Verify、
System-level tech、
Initiation
Demonstration of service
and application
Eleventh
five years'
project
National “863”/3T-Net program
High performance broadband
information networks（3T-Net）
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National “863” program high performance information network（3T-Net）
3T-Net = Tb/s Transport, Tb/s Switching, Tb/s Routing
Duration：2002---2006
Overall objective：
Promote endemic government and network operation company to
construct next-generation, operative, large-scale concurrent multimedia
service and interactive multimedia services to support high performance
broadband information demo network in the Yangtze River Delta, with the
help of self-developed new network core equipments and application
support environments of Tb/s level routing, switching and transmission.
Specific objectives：
Technical objective：Self-develop core node equipments of Tb/s level
optical transmission systems, Tb/s level intelligent optical networks, Tb/s
level routing equipments and etc., and develop related network application
support environment.
Network objective：Build up a practical WAN high performance broadband
information network.
Application objective：Realize services and applications related to largescale concurrent DTV/HDTV broadband stream media, concerned with
National “863”/3T-Net program
IPTV
Stream media on demand
BOD
Large capacity crossover
Burst UNI
Optical multicast
Yangtze River Delta, China
Accomplished in 2006
（1）China Advanced Information Optical Network
(CAINONET)
National “863” program
Accomplished in 2001
（Location：Beijing）
基于SDH的
ATM交换机
（2）National natural science foundation of China
network (NSFCNET)
National natural science foundation
Accomplished in 2001
（Location：Beijing）
（3）40Gb/s SDH System
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National “Tenth five” technology program，
accomplished in 2005.
Self-develop the first international 40Gb/s SDH
optical transmission equipment in accordance
with national standard of ITU-T STM-256 frame
structure.
Realize 40Gb/s SDH signal error-free
transmission over G.652 and G.655 optical fiber.
Source：Fiberhome Technology
STM-256
STM-256
STM-256
ADM
TM
TM
80km
80km
80km
STM-256
STM-256
STM-256
STM-256
ADM
ADM
TM
TM
80km
80km 80km 80km
80km
80km 80km
480km
Dual fiber Self-healing ring
Point to point transport link
（4）80×40Gb/s DWDM System
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National “863” program project, accomplished in 2006.
Develop 80×40Gb/s DWDM system equipment, 40Gb/s optical transmission
adopting NRZ code, realizing 800Km 80x40Gb/s transmission over the G.652
optical fiber.
Overcome key technology problems: Forward Error Correction (FEC), Dynamic
Gain Equilibrium（DGE）, Optical Transceiver Module, 40G OTU, Transport
code and modulate/demodulate technology, Precise chromatic dispersion
management technology.
Build up 80×40Gb/s DWDM Shanghai—Hangzhou practical project.
Source ：Fiberhome Technology
小区
IP
DWDM
ASTN
上海
小区
数据
中心
南京
IP
数据
中心
数据
中心
小区
IP
DWDM
ASTN
ASTN
小区
小区
杭州
数据
中心
小区
（5）160X10Gb/s ultra long-haul optical transmission system
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National “863” program, accomplished in 2005.
Self-develop optical transmission system of
1.6Tb/s, relay transmission distance of 3000km5000km (G.652、G.655 optical fiber) without
electricity provision.
Build up ULH/WDM network demo project in
Xinjiang area (1000km relay transmission over
G.652 optical fiber without electricity provision).
Master completely core technologies of
ULH/WDM system (C+L wavelength band),
Raman optical fiber amplifier, test and
application ...
Two standard recommendations (D.735、D.736)
are accepted by ITU-T, leading draft qualification
of ITU-T G.raman.
Source ：ZTE
（6）Large capacity ASON
Equipment
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National 863 program, accomplish in
2006.
Self-develop ASON node devices,
supporting services of link layer
Multicast-ASON and Burst-ASON,
overcoming ASON large-scale
hierarchical routing technology.
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Deployed in 863/3T-Net and Telecom
networks, also applied in Hainan
district.
Multiple recommendations are adopted
by ITU-T.
Source ：Huawei Technology
（8）Optical Burst Switching Test-bed
Source: BUPT, SJTU and so on.
1、 National natural science foundation , National 863 program, Burst service
based novel optical switching technology.
2、First domestic institute (leading in the world) of successfully building up
Optical Burst Switching (OBS) test-bed, supporting image, voice, data and grid
service access.
Research direction of future optical
communication technology
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Service-driven, flexible and dynamic architecture and technology of
optical networks
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Deploying mechanism of optical wavelength attributes and
application technologies in the next-generation network
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Intelligent optical switching and optical inter-connecting technology
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Autonomic optical networks and condition monitoring (Selfawareness, Self-adaptation, Self-organization)
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Intelligence, Packet transmission and Extension of MPLS protocol
（G-MPLS、T-MPLS、Wireless MPLS...）
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Large-scale broadband optical access application technology
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Crossover convergence technology (optics and wireless, optics and
sensoring, optics and service, optics and resource, optics and
computing …)
3G and 4G Mobile
Communication Networks
China 3G Mobile Systems
TD-SCDMA
 LAS-CDMA
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TD-SCDMA
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TD-SCDMA as the world’s 3rd 3G mobile
system was officially accepted by the
ITU-R in May 2000;
System works in TDD and uplink
synchronous mode, supporting
asymmetric data transmission;
Series of new technologies are adopted
in the system
TD-SCDMA
LAS-CDMA
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LAS-CDMA – Large Area Synchronous
CDMA
The core innovation is the discovery of
a group of pseudo-random codes called
LA/LS codes which are capable to
decrease the various kinds of
interferences (Intersymbol interference,
multiple address interference and
adjacent cell interference)
多址码的特性 1----传统CDMA
G – Processing Gain
•Autocorrelation function
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G-1/2
-20
-10
0
10
Relative delay
20
•Crosscorrelation function
G-1/2
-20
-10
0
10
20
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多址码的特性 2----LAS-CDMA
 Autocorrelation
function:
 Crosscorrelation
function:
IFW: Interference
free window
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IFW
4G System Development
-- FUTURE Project
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FuTURE – Future Technologies for Universal Radio Environment as a
part of China High-Tech 863 program.
Phase 1: Six universities cooperating with six companies
developed six transmission schemes for B3G mobile.
Phase 2: Jointly develop wireless network experimental system
supporting both FDD and TDD on a common platform.
Phase 3: Trial & Pre-commercial System will be developed.
Vision, Spectrum, Tech Trends
Candidate Proposals
Key Tech
FuTURE
Standardization
Demo Sys & Appl
FuTURE+
2001
ITU’s Activities
2003
2005
Trial & Pre-commercial System
FuTURE II
GMC/OFDM FDD SYSTEM
Coding
Intl.
Mapp.
STC/SM
Insert
Pilot
Sub-Channel Transmitter 1
100Mb/s peak uplink and downlink
high-speed transmission rate;
….
MCU
Freq. Synth.
1
Sub-channel Receiver
2
3
Sub-channel Receiver
Interface and Control
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Iterative receiving technology;
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Distributed radio network
architecture;
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MIMO-GMC technology in uplink;
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MIMO-OFDM in downlink;
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MIMO adaptive link transmission
technology
N
MultiMultiMC-AFB / FFT
MultiTime
& Freq.
filter
bank
filter
bank
filter
bank
Synch.
Sub-channel Receiver
Sub-channel Receiver
FDMA and TDMA hybrid multiple
access;
RxRF
RF
Rx
RF
Rx
subTxRF
system
sub
system
sub
---system
Sub-Channel Transmitter N
Intf
….
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A/D
A/D
A/D
D/A
A/D
A/D
A/D
A/D
Baseband
Decod.
Rx/Tx
filter
Rx/Tx
filter
Rx/Tx
Filtersfilter
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Sub-Channel Transmitter 3
多载波
多载波
多载波
MC-SFB
/
IFFT
Sub-Channel Transmitter 2
RxRF
RF
Rx
RF
Rx
subRxRF
-system
system
sub
sub
--system
RF and Antennas
DeIntl
DeMap
ST JD
CHE
Antennas
Breakthrough of B3G Theory
——B3G TDD Network Architecture
 Flat Radio Access Network
– All-IP based architecture
– Short latency
 Novel Cellular Architecture
– Group Cell
– Slide Handover
– User always in cell center
– Solve “smaller cell” problem
– Avoid “cell edge” effect
– Avoid frequent handover
– Enlarge coverage area
 Fully Explore Space Diversity
– Distributed Antenna Array
– Virtual MIMO
– Multi-hop, Relay
B3G外场试验主要特征
试验系统
双工方式
试验频段
调制方式
M IM O 多天线
传输数据率
频谱效率
场景
覆盖范围
天线参数
额定发射功率
RoF分布式无线电系统
6个接入点,3个小区,4个基站,6个终端
FDD/TDD共址
3.5GHz@20MHz,100MHz频段范围
GMC/OFDM
8X4 或 分布式4X4
40-100Mbps/高速移动
2-10bps/Hz
开阔地，城市热点，高架路
约1km 2 微小区，大于1km高速路
定向天线，增益17dBi
27dBm
B3G Field Trial characteristics
Trial system
Duplex mode
Frequency band
Modulation
MIMO
Data Rate
spectrum efficiency
Senatio
Coverage
Antenna
Tranmission power
RoF-based distributed radio
6 access points, 3 cells, 4 CUs, 6 MTs
FDD/TDD Co-exist
3.5GHz@20MHz,100MHz total bandwidth
GMC/OFDM
84 , distributed antenna 44
40-100Mbps/high mobility
2-10bps/Hz
Campus, urban, highway
about 1km2 micro-cell，>1km highway
directioanl, polarization, 17dBi
27dBm/antenna
典型业务
 移动高清IPTV
 移动高清视频摄录
 无线移动视频会议
 无线移动视频点播
 无线移动VoIP电话
 无线移动Web浏览
 无线移动FTP文件传输
Services Demo
 Wireless IPTV
 Wireless Remote Video
 Wireless Video Conference
 Wireless VOD
 Wireless VoIP Phone
 Wireless Web Browse
 Wireless FTP
NEXT GENERATION INTERNET
NGI
Given in the presentation of
Prof. MA Yan
NEXT GENERATION
NETWORK
NGN
CN2 – Network Topology
Designed and Deployed by
China Telecom
THANK YOU!