Huawei eLTE Solution Success Case

for Zhengzhou Metro Project

1

Project Background

• Zhengzhou: a major city and transportation hub in the central region of China

• Six metro lines, and total length of 202.53 km constructed to improve traffic conditions and support the

city's sustainable development

2

Metro Line 1: First Metro Line in Zhengzhou

Project Overview Strategic Requirements

3 Phases: Phase I (2014), Phase II (2016), Phase III

(2023)

• Phase I: 26.2KM, 1 control center, 20 stations, 26

trains, PIS and video surveillance services

• Phase II: 55 trains, train control services

• Phase III: 67 trains, command & dispatch services

Passenger Oriented

• PIS: Travelling information such as route, station

transfer, ticket price, and entertainment Information

including news, TV program, and advertisement

• CCTV: real-time monitoring of carriage, driver’s

cab, and railway, and safe

Future Oriented

• Leading technology in future 10~15 Years

• High Mobility: better performance in a speed of

200km/h in the future

• Easy Service Expansion: PIS, video surveillance, train

control and trunking service in one network in the future

3

2 Choices Available to Zhengzhou Metro Group

CBTC Train Dispatching PIS, CCTV

WiFi:

• Free & open frequencies, and more interference

source

• No QoS guarantee mechanism

• No ways to guarantee better service performance in

high mobility

• More sites, and difficult maintenance in tunnel

TETRA:

• Only voice, and no data& video dispatching

3 Networks, and High Operation Costs

One Networks for Multi-services

• Easy Service Expansion: PIS, video surveillance,

train control and trunking service in one network in

the future

• High Bandwidth: now minimum DL 6Mbps and UL

6Mbps for one train, UL 48Mbps in the future

• High Mobility: Better performance in 200KM/H

• High Performance: multi-level QoS to guarantee

smooth video broadcast

4

2011.3 2011.5 2011.6 2011.11 2010.9 2013.11

Starting 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

Huawei’s Innovation Progress Together with Zhengzhou Rail Transport Company

5

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

6

eLTE Engineering for Zhengzhou Metro

RRU

Secondary Combiner

Leaky Cable

BBU+RRU Inside Tunnel

Customized

TAU Equipment Cabinet in the Cab

eLTE for Depot and Parking Coverage

RRU

BBU

Indoor Antenna

7

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

User Data User Data

• Scheduling in a 20M bandwidth, inaccurate channel

quality report

• No special advanced technologies reduce

interference

• Scheduling based on 15k sub-carriers, accurate

channel quality report

• Advanced technologies (ICIC, IRC) to reduce

interference

8

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

9

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

• Packet loss:10-2

• Latency:300ms

• Packet loss:10-6

• Latency:150ms

• Packet loss:10-3

10

Larger Coverage and Easy Operation & Maintenance

Leaky Coaxial Cable

RRU RRU RRU

Average

1.325KM

• Distance between stations : maximum 2.35KM, minimum 944M, and average 1.325 KM

• Reusing the existing commercial leaky cable, and low network deployment cost

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

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

Easy Service Expansion to Support Train Dispatch & CTBC in The Future

PIS CCTV

EPC

RAN

TV Wall

PIS System Video Severs

EPC

RAN

TV Wall Dispatcher

PIS System Voice & Video Severs

PIS CCTV CBTC Train Dispatching

14

World’s 1st LTE Based Urban Rail Transport Wireless Communication Solution for Zhengzhou Metro

Huawei eLTE Urban Rail Transport Wireless Communication Solution Commercially

Launched in Zhengzhou On Nov. 29, 2013

15

Benefit from Huawei eLTE Urban Rail Transport Solution

eLTE

Convenient Travelling

Agile Dispatching

Safe Operation

• Specialized anti-interference

technologies

• Multi-level QoS algorithms

• High mobility, large coverage, and

seamless handover

• Visualized dispatching to ensure real

scene visible, command directing up

to group members

• CCTV over LTE to know & control

onsite emergency

• PIS over LTE to support real-time

passenger information, and news

broadcast

16

Highly Valued by Zhengzhou Rail Transport Company

Xia Jinghui, CTO, Zhengzhou Rail Transport

Company

“The successful application of LTE technology in

Zhengzhou Metro brings innovative breakthrough in

improving metro operation efficiency and

passenger’s travelling experiences . Compared to

other technologies, the LTE technology has

significant advantages in network capacity,

coverage, anti-interference, and high mobility, which

will further strengthen our confidence in using

Huawei eLTE solution for later metro lines.

- Xia Jinghui, CTO, Zhengzhou Rail Transport

Company

17

Highly Valued by Zhengzhou Rail Transport Company

Liu Hongtai, Vice-general Manager, Operation Department,

Zhengzhou Rail Transport Company

“Zhengzhou Metro is the world’s 1st line adopting

LTE technology, which is a very important milestone.

The successful application proves that LTE

technology can entirely satisfy the requirements of

metro operation, and it will also set an example and

reference for later LTE wireless broadband

applications in metro. I believe that LTE technology

will be sure to extensively used for metro industry”

- Liu Hongtai, Vice-general Manager, Operation

Department, Zhengzhou Rail Transport Company

18

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