Recent Advances of Communications Technology in China

CHEN JunliangState Key Laboratory of Networking a

nd Switching TechnologyBeijing University of Posts and Teleco

mmunications

August, 2007

Main Contents

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 CommunicationsNetworks in China

Optical Transmission System

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

Outline

4,000,000Km optical fiber laying in China 160×10Gb/s 、 80×40Gb/s DWDM syste

m applied in optical network ULH/WDM ultra long-haul optical transm

ission 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

Development of optical communication technology

Direction 1 ： Ultra high-speed, large capacity, long-distance transport platform

Direction 2: Intelligent, multiple-service and converged carrier platform

National 863/O-TIME Program

O-TIME （ Optical Technology for Internet with Multi-wavelength Environment ） plan is the national “Tenth five years' projectTenth 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 multi-

wavelength 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 Broadband optical access

Node optical switching Intelligent optical interconnecting network

Interconnecting, Test,

Milestone achievement

2001

System-level tech、

Demonstration of service

and application

2002

2003

2004

2005

Design、 Verify、

Initiation

Key tech, Key module,

Experimental system

Eleventh Eleventh five years' five years'

projectproject

National “863”/O-TIME program roadmap

National “863” program high performance information network （ 3T-Net ）

3T-Net3T-Net = TTb/s Transport, TTb/s Switching, TTb/s Routing Duration ： 2002---2006 Overall objective ： Promote endemic government and network operation company to constru

ct 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 opti

cal 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 large-scale concurrent DTV/HDTV broadband stream media, concerned with Internet broadband interactive services.

High performance broadband information networks （ 3T-Net ）

National “863”/3T-Net program

IPTVStream media on demandBODLarge capacity crossoverBurst UNIOptical multicast

National “863”/3T-Net program

Yangtze River Delta, China

Accomplished in 2006

基于 SDH的ATM交换机

（ 1 ） China Advanced Information Optical Network (CAINONET)

National “863” programNational “863” programAccomplished in 2001Accomplished in 2001

（（ LocationLocation ：： BeijingBeijing ））

（ 2 ） National natural science foundation of China network (NSFCNET)

National natural science foundationNational natural science foundation Accomplished in 2001Accomplished in 2001

（（ LocationLocation ：： BeijingBeijing ））

Dual fiber Self-healing

ring

STM-256

ADM

STM-256

ADM

STM-256

ADM

80km 80km

80km

Point to point transport link

STM-256

TM

STM-256

TM

80km

STM-256

TM

STM-256

TM

480km

80km 80km 80km 80km 80km 80km

（ 3 ） 40Gb/s SDH System National “Tenth five” technology program ，

accomplished in 2005. Self-develop the first international 40Gb/s SD

H 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

National “863” program project, accomplished in 2006. Develop 80×40Gb/s DWDM system equipment, 40Gb/s optical transmissio

n 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.

（ 4 ） 80×40Gb/s DWDM System

Source ： Fiberhome Technology

（ 5 ） 160X10Gb/s ultra long-haul optical transmission system

National “863” program, accomplished in 2005.

Self-develop optical transmission system of 1.6Tb/s, relay transmission distance of 3000km-5000km (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

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.

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

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 gri

d service access.

Source: BUPT, SJTU and so on.

Service-driven, flexible and dynamic architecture and technology of optical networks

Deploying mechanism of optical wavelength attributes and application technologies in the next-generation network

Intelligent optical switching and optical inter-connecting technology

Autonomic optical networks and condition monitoring (Self-awareness, Self-adaptation, Self-organization)

Intelligence, Packet transmission and Extension of MPLS protocol（ G-MPLS 、 T-MPLS 、 Wireless MPLS... ）

Large-scale broadband optical access application technology

Crossover convergence technology (optics and wireless, optics and sensoring, optics and service, optics and resource, optics and computing …)

Research direction of future optical communication technology

3G and 4G Mobile Communication Networks

China 3G Mobile Systems

TD-SCDMA LAS-CDMA

TD-SCDMA

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 LAS-CDMA – Large Area Synchronous

CDMA The core innovation is the discovery o

f 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

-20 -10 0 10 20

-20 -10 0 10 20

•Autocorrelation function

•Crosscorrelation function

Relative delay

G-1/2

G-1/2

G – Processing Gain

多址码的特性 2----LAS-CDMA Autocorrelation function:

Crosscorrelation function:

0

0

0

0

IFWIFW: Interference free window

4G System Development-- FUTURE Project

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.

FuTURE

FuTURE+

FuTURE II2001 2003 2005

Key Tech

Demo Sys & Appl

Trial & Pre-commercial System

Vision, Spectrum, Tech Trends

Candidate Proposals

Standardization

ITU’s Activities

GMC/OFDM FDD SYSTEM

100Mb/s peak uplink and downlink

high-speed transmission rate;

FDMA and TDMA hybrid multiple

access;

Iterative receiving technology;

Distributed radio network architecture;

MIMO-GMC technology in uplink;

MIMO-OFDM in downlink;

MIMO adaptive link transmission

technology

多

载波

多

载波

多载

波M

C-SFB

/ IFFT

A/DA/DA/DD/A

Multi-filter bank

Rx/T

x filter R

x/Tx filter

MCU Intf Freq. Synth.

Antennas Sub-channel Receiver 1

Sub-channel Receiver N

Sub-channel Receiver 2

….

Sub-channel Receiver 3

Sub-Channel Transmitter 1

Sub-Channel Transmitter N

Sub-Channel Transmitter 2

….

Sub-Channel Transmitter 3

Baseband

RF and Antennas

Multi-filter bank

Rx/T

x filter Filters

Multi- filter bank

A/D A/D A/D Rx RF

sub -system Rx RF

sub -system Rx RF

sub - system RxRF A/D

Interface and Control

Rx RF sub -system

Rx RF sub -system

Rx RF sub - system TxRF

MC

-AFB

/ FFTT

ime &

Freq. Synch.

Coding Intl.

Mapp.

STC/SM

InsertPilot

CHE

DeMap

DeIntl

Decod.

ST JD

移动IP管理

IP

无线IP适配子层

无线承载管理

MAC子层

物理层管理 物理层承载

网络层

无线链路层

物理层

物理控制信道 物理数据信道

无线承载

无线承载

无线承载

. . .

. . .分组管理 分组管理

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 TDD Network Architecture

Breakthrough of B3G Theory

B3G 外场试验主要特征RoF分布式无线电系统6 , 3 , 4 , 6 个接入点 个小区 个基站 个终端

双工方式 FDD/ TDD共址试验频段 3. 5GHz@20MHz, 100MHz 频段范围调制方式 GMC/ OFDM

MIMO多天线 8X4 4X4或 分布式传输数据率 40-100Mbps/高速移动频谱效率 2-10bps/ Hz场景 开阔地，城市热点，高架路

覆盖范围 1km约 2 1km微小区，大于 高速路天线参数 17dBi定向天线，增益

额定发射功率 27dBm

试验系统

B3G Field Trial characteristics RoF-based distributed radio6 access points, 3 cells, 4 CUs, 6 MTs

Duplex mode FDD/TDD Co-existFrequency band 3.5GHz@20MHz,100MHz total bandwidthModulation GMC/OFDMMIMO 84 , distributed antenna 44Data Rate 40-100Mbps/high mobilityspectrum efficiency 2-10bps/HzSenatio Campus, urban, highwayCoverage about 1km2 micro-cell，>1km highwayAntenna directioanl, polarization, 17dBiTranmission power 27dBm/antenna

Trial system

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 TopologyDesigned and Deployed by China Telecom

THANK YOU!