innovation & convergence, changing the future of … of metro wireless communication david xu...

Innovation & Convergence, Changing the

Future of Metro Wireless Communication

David Xu

Enterprise Wireless General Manager

2

Metro Applications

PIS, CCTV

Existing Situation of Urban Rail Transport Wireless Communication

Train Dispatching

CTBC

Narrow Band Trunking Technology

• Voice, short data

Broadband Data Technology

• Real time data transmission of

CBTC

Broadband Data Technology

• PIS

• CCTV

3

Challenges Faced by Urban Rail Transport Wireless Communication

Service Requirements of

Urban Rail Transport

Video transfer in

train and along

railway

CBTC：Bidirectional

real-time transmission of

train control information

Train Dispatching

Current Challenges

1. Free & open frequencies, and more

interference source

2. No QoS guarantee mechanism

3. More sites, and difficult maintenance in tunnel

4. 3 independent networks, and high operation

costs

5. Only voice, and no data& video dispatching

6. No ways to guarantee better service

performance in high mobility PIS：Real-time

broadcast of video,

information, and

disaster emergency

4

Huawei’s Innovation Progress Together with Zhengzhou Rail Transport Company

2011.3 2011.5 2011.6 2011.11 2010.9 2013.11

Staring Point

Discussion about PIS and

Ground-to-Train

communication solution

Signed Cooperation Agreement

Signed innovation agreement of

Ground-to-Train communication solution

by two parties

Innovation Approval

Project innovation approved

by Huawei, and coming into

implementation phase

Acquired 1.8Ghz Frequency

Applied for frequency band (1795M-

1805M) for Ground-to-Train wireless

communication

Passed Technical Innovation

Demonstration

Huawei LTE metro Ground-to-Train

communication solution was adopted

Project Launch

Joint commercial launch

5

Huawei eLTE Urban Rail Transport Solution: Innovation & Convergence, Changing the Future of Metro Wireless Communication

Innovation

• Mainstream Technology, First launch globally

• Advanced anti-interference technologies in air

interface

• Multi-level QoS algorithms

• High mobility, and seamless handover algorithms

Convergence • One network to bear PIS, CCTV, broadband

trunking, and CBTC simultaneously

• Broadband trunking to support voice & video

dispatching simultaneously

• Convergence of broadband trunking & video

conferencing

Safe Operation

• Specialized anti-interference tecnologies

• Multi-level QoS algorithms

• High mobility, large coverage, and seamless

handover

Agile Dispatching

• Visualized dispatching to ensure real scene visible,

command directing up to group members

• Convergence of broadband trunking & video

conferencing, and fast decision

Convenient Travelling

• PIS over LTE to support real-time passenger

information, and news broadcast

• CCTV over LTE to know & control onsite

emergency

• Telepresence over LTE: telepresence & video

conferencing convergence

Change

6

Effective Anti-interference Technologies to Improve Onboard Service Experiences & Driving Safety

Safe Operation Agile Dispatch


WiFi

LTE

Better LTE channel structure than Wifi

• LTE：Scheduling based 15k sub-

carriers, and 20Mhz networking

• WiFi： Scheduling based 20M

bandwidth，20*7=140M networking

LTE WiFi

Physical layer

Pilot detection

Fast power control

Interleaving

MIMO

No

•Link •Layer

HARQ Retransmission

Slow power control

AMC

No

Network Layyer

ICIC

CoMP

Open loop

power

control

• WiFi: no data receiving if signal

strength < -90dbm

• LTE: data receiving if signal strength

< -130dbm

0

50

100

150

-60 -70 -80 -90 -100 -110 -120 -130

Mbps

dBM

Systematic anti-interference

technologies to achieve 20dB+

gain V.S Wifi

Better LTE receiving performance

than WiFi

7

High Mobility, Seamless Handover to Ensure Service Continuity

WiFi: 80 km/h

• 4 vehicle-mounted devices in connected state,

another in the cell center to ensure service continuity

when one in cell reselection

• 1~2S service interruption if more interferences in

handover area

LTE: 200km/h

• Seamless handover, no data loss, and handover delay

< 50ms

• Designing speed: 200km/h, not behind other

technologies in future 10－15 years

2 network for

overlapped

coverage

2 devices

separately to

access 2 networks

Previous Cell Adjacent Cell

Core Network

X2 Interface



8

Multi-level QoS to Ensure Reliable Transmission of Key Data Service

WiFi：Contention based QoS algorithms

• Users accessing to network by free contention, and no

absolute user priority

• About 60% packet loss rate in intra-frequency interference

• 100% packet loss rate if 2 interference sources, and not

meeting metro service requirements

LTE：9-level QoS algorithms

• Guarantee service QoS of the highest priority in

congestion，for example, CBTC

WiFi No user priority CBTC PIS、CCTV Trunking Voice

• Bandwidth allocation based on service requirements

Level1 Level 2 Level 3 Level 4

CBTC Tunking

PIS CCTV

• Latency:100ms

• Packet loss:10-6

• Latency:100ms


• Latency:300ms


• Latency:150ms




9

Voice, Video, and Data All-in-one to Greatly Improve Dispatching Efficiency

User1 User 2 User 3

Onsite Scenes

Video

Voice

• When massive data coming, convergence of eLTE voice, data, video to enrich

dispatching services and improve dispatching efficiency

Data

Location Info Mobile Office

Dispatching Center

Safe Operation Agile Dispatch Convenient Travelling

10

Group Call Setup：300ms

Pre-emptive call: 150ms

Group Members:+∞ Real-time backup, and fault protection

Professional Trunking performance to Ensure Agile Dispatching

LTE

Group 1 Group 2 Group 3



11

PIS over LTE：Real-time News, Transferring Info, Online Advertisement, and Convenient Travelling Life

Transmission

EPC PIS System

• High bandwidth, low latency, and better performance to match PIS service requirements

• Real-time news, transfer info, and online advertisement to improve travelling convenience, and

increase metro customer revenues

Real-time News Transfer Info Online Advertisement Safe Operation Agile Dispatch


12

CCTV over LTE: Real-time Know & Control Onsite Emergency

• High bandwidth, low latency to support HD video, and comprehensive surveillance of station, carriage,

and rail, and quickly know and know onsite emergency

LTE

Station Rail Carriage

Dispatching Center

DL 100Mbps，UL 50Mbps Latency <50ms


13

Telepresence over LTE：Quick Decision, and improving Dispatching efficiency

LTE

Video

Video Conferencing Room in Dispatching Center

Station Dispatching Center Onsite Staff ECV

• Convergence of eLTE and telepresence to enable visible scenes, quick meeting and decision,

and improve dispatching efficiency


14

IP Network

LTE RRU

Switch

LTE BBU

Station

LCD Switch

LTE BBU

Station

LCD Switch

LTE BBU

Leaky Coaxial Cable or Antenna TAU TAU

Track &Train

Station

LCD

Innovative eLTE Solution for Zhengzhou Metro

Center Server PIS System Dispatcher OMC

Voice & Video Severs

eCNS600

LTE RRU LTE RRU

15

PIS CBTC Customized Rail Auxiliaries

Comprehensive Cooperation with Rail Transport Partners

• IOT with CASCO, performance better

than WLAN

• IOT with INSIGMA, full adapatation

verification in moving train

• IOT with Neusoft, Shanghai

Zhizhen, better performance

• Dispatcher for rail transport

industry

• Customized rail industry devices

including cab radio, and handset

16

Industry Partners Consulting & Designing Partners

Partners (100+)

Help Customers Succeed

Close Cooperation with Partners to Help Customers Succeed

http://www.crsc.com.cn/index.html

17

Innovation & Convergence, Changing the Future of Metro Wireless Communication

Innovation & Convergence

Safe Operation, Agile Dispatch, a and


Copyright©2012 Huawei Technologies Co., Ltd. All Rights Reserved.

The information in this document may contain predictive statements including, without limitation, statements regarding the future financial and operating results, future product

portfolio, new technology, etc. There are a number of factors that could cause actual results and developments to differ materially from those expressed or implied in the predictive

statements. Therefore, such information is provided for reference purpose only and constitutes neither an offer nor an acceptance. Huawei may change the information at any time

without notice.

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innovation & convergence, changing the future of … of metro wireless communication david xu...

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