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
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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
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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
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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
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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
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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
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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
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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
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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
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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
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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
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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
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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
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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
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