Railway Mobile Telecommunication Jianlin, GUO Chief Engineer , - - PowerPoint PPT Presentation

The Next Generation of Railway Mobile Telecommunication

Jianlin, GUO Chief Engineer , ZTE, China Wednesday, 8th July, 2015, Sessions: 5A - System Improvement -

Content

• Overview of Railway Communication Development
• LTE-R Service Requirement and Key Technology
• ZTE LTE-R Solution
• Cases
• Conclusion

2 Jianlin, GUO Chief Engineer , ZTE, China Wednesday, 8th July, 2015, Sessions: 5A - System Improvement -

Challenges for Train Operators At Present

3

High Speed Challenges Limitation of GSM-R New Requirements

Multi-Media Dispatching Real-time Safety Monitoring Travel Information Real-time TV Doppler Effect Frequent Handover and Re-selection Link Performance Decline Lower Safety and Reliability Insufficient Capacity Limited Support for Data Service Interference on GSM900

How to guarantee the safety and reliability How to increase the capacity How to satisfy the new requirements

Jianlin, GUO Chief Engineer , ZTE, China Wednesday, 8th July, 2015, Sessions: 5A - System Improvement -

Future Railways Telecom Requirements

More Secure, Easy Operation and Maintenance, Better Travel Experience

4

Operation & Maintenance Services

Passengers- Oriented Services

Base the requirements and Challenges ,UIC pointed out GSM-R evolutes to LTE

Jianlin, GUO Chief Engineer , ZTE, China Wednesday, 8th July, 2015, Sessions: 5A - System Improvement -

Service Requirements in Future Railway

5

Railway Safety Services Passengers Services Operation and Maintenance

Scenario Travel Security Services Operation and Maintenance Passengers Services

Total

UL throu ghput (Mbps) DL throu ghput (Mbps) UL throu ghput (Mbps) DL throug hput(M bps) UL throug hput(M bps) DL through put(Mbp s) UL throu ghput (Mbps) DL throug hput(M bps) Section 2 2 10 1 0.5 4 12.5 7 Station 4 4 20 2 0.5 8 24.5 14

TDD LTE is better for LTE-R 20MHz bandwidth may be necessary

Jianlin, GUO Chief Engineer , ZTE, China Wednesday, 8th July, 2015, Sessions: 5A - System Improvement -

Advantages of ZTE LTE-R

6

Larger Bandwidth

 20MHz bandwidth

DL: >100Mbps; UL: >50Mbps

 Higher spectrum efficiency

3~4times of HSDPA, 2~3times of HSUPA

Less Delay More Safety Flattening system architecture

End-to-end encryption of

hardware

AS, NAS security mechanism Access authentication Remote inhibit & recovery

Higher Speed

Better railway solution

Supporting 500km/h High speed

Jianlin, GUO Chief Engineer , ZTE, China Wednesday, 8th July, 2015, Sessions: 5A - System Improvement -

Key Technology of ZTE LTE-R Solution

7

AFC technology against the Doppler frequency shift

• 2

• 1

Super-Cell technology to reduce the frequency of handover

Super cell mode

RRU RRU RRU

logical cell

Handover General mode

RRU RRU RRU RRU RRU RRU

• 5

• 1500
• 1000
• 500

Handover Handover

Double Layer coverage with 1+1 Hot backup to guarantee the network reliability Cloud Radio Technology to decrease the interference and improve the throughput

eNode B 0% 50% 100% 150%

140.82%

Same Frequency Networking Cloud Scheduling Throughput Comparison

Interference optimization and efficient resource allocation in Network level, to improve the spectrum efficiency

Jianlin, GUO Chief Engineer , ZTE, China Wednesday, 8th July, 2015, Sessions: 5A - System Improvement -

ZTE LTE-R Solution 1: TDD LTE @ B1G band

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Specified frequency band for railway Independent network and fully support railway service Interworking with GSM-R and PSTN Support FAS dispatch

Jianlin, GUO Chief Engineer , ZTE, China Wednesday, 8th July, 2015, Sessions: 5A - System Improvement -

ZTE LTE-R Solution 2：G&L Refarming @900M

Step2 GSM-R+LTE-R Step1 GSM-R Refarming with no guard band For 4MHz 1 GSM-R carrier + 1 LTE-R carrier (1.4MHz or 3MHz bandwidth) For 7MHz 2 GSM-R carrier + 1 LTE-R carrier(5MHz/3MHz) , or 1 GSM-R + 2 LTE-R (3MHz)

GSM-R GSM-R/ LTE-R LTE-R

• VGCS/VBS
• ETCS
• Dispatching
• GPRS
• P2P Voice
• GSM-R: P2P Voice , ETCS,

Dispatching, VGCS/VBS

• LTE-R: CCTV, PIS , Other

data service

• P2P

, VGCS/VBS

• Multi-Media

Dispatching

• ETCS
• CCTV,PIS
• Other data

services

ZTE provide Unified SDR Platform Refarming Solution for Railway Operator

9 Jianlin, GUO Chief Engineer , ZTE, China Wednesday, 8th July, 2015, Sessions: 5A - System Improvement -

Case 1, Shanghai-Hangzhou HSR

The world's First TD-LTE High-Speed Railway Network

Shanghai-Hangzhou HSR Overview

 Frequency : 1.9GHz

 Bandwidth: 20M/Dual mode  Design speed: 350km/h  Distance: 62.5km  Scale & configuration: 16 BBU + 129 RRU (62 sites)

HSR Communication Network Overview

Performance at high-speed scenario SNR (dB)

• 3

1 9 13 17 3km/h (Mbps) 2.8 6.2 14.2 19.6 23 300km/h (Mbps) 2.8 6.2 13.9 18.3 21.4 Loss Rate (%) 2.11 6.63 6.95 Performance loss rate of uplink is less than 7% at the speed 300km/h Performance for Shanghai-Hangzhou HSR

Terminal access success rate 100% Handover success rate 100% Average throughput of downlink 28Mbps Average throughput of uplink 7.2Mbps

10 Jianlin, GUO Chief Engineer , ZTE, China Wednesday, 8th July, 2015, Sessions: 5A - System Improvement -

Case 2, Wenzhou City Railway

• Multimedia dispatching: voice and video dispatching
• PIS (Passenger Information System): provide video

and text information on the terminals

• Video Surveillance (CCTV): provide real-time video

surveillance in control centre

• Other services: train status information sending to

control center, etc.

Offered Services

• Wenzhou S1 line: total distance 77

km, 28 stations designed

• Train speed: 120~160km/h
• Freq. Band: 1.8 GHz
• Bandwidth: 20 MHz
• One EPC in the control centre
• eNodeB distance : maximum

1.2km

Project Overview

11 Jianlin, GUO Chief Engineer , ZTE, China Wednesday, 8th July, 2015, Sessions: 5A - System Improvement -

Case 3, CBTC over LTE Trial

Performance test item Requirement Result CBTC transmitting delay ＜300ms ＜100ms CBTC packet loss ＜0.5% ＜0.1% CBTC handover delay ＜150ms ＜100ms CBTC handover loss ＜0.5% ＜0.1%

TD-LTE could satisfy the requirements of CBTC carrying

ZTE has finished CBTC over LTE test, showed excellent performance ZTE has finished CBTC over LTE trial in Beijing, passed all the test items.

• Line length 8631.419 m，viaduct 785m，

tunnel 925m

• 9 stations
• Test Service including CBTC、status

information、PIS、CCTV

• Band 1.4G（1447~1467MHz）；1.8G（

1785~1805Mhz）

12 Jianlin, GUO Chief Engineer , ZTE, China Wednesday, 8th July, 2015, Sessions: 5A - System Improvement -

Conclusion

• As the evolution of GSM-R, LTE technology is the preferred

solution for next generation of railway telecommunication.

• TDD LTE is a key solution and comply with the future railway
• requirements. And G&L dual-mode network is another key

solution for GSM900MHz.

• Specified frequency band is the biggest challenge for LTE-R.

The unified frequency band planning and application for LTE- R in the worldwide is very urgent and necessary.

13 Jianlin, GUO Chief Engineer , ZTE, China Wednesday, 8th July, 2015, Sessions: 5A - System Improvement -

Thank you