The Next Generation of Railway Mobile Telecommunication Jianlin, GUO Chief Engineer , ZTE, China Wednesday, 8 th 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 Jianlin, GUO Chief Engineer , ZTE, China 2 Wednesday, 8th July, 2015, Sessions: 5A - System Improvement -
Challenges for Train Operators At Present Doppler Effect High Speed Frequent Handover and Re-selection Challenges Link Performance Decline Lower Safety and Reliability Insufficient Capacity Limitation of Limited Support for Data Service GSM-R Interference on GSM900 How to guarantee the safety and reliability How to increase the capacity Multi-Media Dispatching How to satisfy the new requirements New Real-time Safety Monitoring Requirements Travel Information Real-time TV Jianlin, GUO Chief Engineer , ZTE, China 3 Wednesday, 8th July, 2015, Sessions: 5A - System Improvement -
Future Railways Telecom Requirements More Secure, Easy Operation and Maintenance, Better Travel Experience Passengers- Oriented Services Operation & Maintenance Services Base the requirements and Challenges ,UIC pointed out GSM-R evolutes to LTE Jianlin, GUO Chief Engineer , ZTE, China 4 Wednesday, 8th July, 2015, Sessions: 5A - System Improvement -
Service Requirements in Future Railway Railway Safety Services Scenario Travel Operation and Passengers Total Security Maintenance Services Services UL DL UL DL UL DL UL DL throu throu throu throug throug through throu throug ghput ghput ghput hput(M hput(M put(Mbp ghput hput(M (Mbps) (Mbps) (Mbps) bps) bps) s) (Mbps) bps) Operation and Maintenance Section 2 2 10 1 0.5 4 12.5 7 Station 4 4 20 2 0.5 8 24.5 14 Passengers Services TDD LTE is better for LTE-R 20MHz bandwidth may be necessary Jianlin, GUO Chief Engineer , ZTE, China 5 Wednesday, 8th July, 2015, Sessions: 5A - System Improvement -
Advantages of ZTE LTE-R 20MHz bandwidth DL: >100Mbps; UL: >50Mbps Higher spectrum efficiency 3~4times of HSDPA, 2~3times of HSUPA End-to-end encryption of Larger Bandwidth hardware AS, NAS security mechanism Access authentication Less Delay Remote inhibit & recovery Better railway Flattening system architecture solution More Safety Higher Speed Supporting 500km/h High speed Jianlin, GUO Chief Engineer , ZTE, China 6 Wednesday, 8th July, 2015, Sessions: 5A - System Improvement -
Key Technology of ZTE LTE-R Solution AFC technology against the Doppler Super-Cell technology to reduce the frequency shift frequency of handover General mode 频 偏 跟 踪 性 能 分 析 ( SNR=-4dB) 16QAM,MCS=21 I L 0 1500 10 4500 0&7 、 4&11 估 计 ， 时 域 补 偿 FO=0Hz, No FOC 0&7 、 4&11 估 计 ， 频 域 补 偿 FO=1500Hz, With FOC 4000 0&4 、 4&7 、 7&&11 估 计 ， 频 域 补 偿 FO=850Hz, With FOC 1000 0&4 、 4&7 、 7&11 估 计 ， 时 域 补 偿 3500 RRU RRU RRU RRU RRU RRU 500 3000 FO Value (Hz) 实 际 频 偏 值 Throughput 频 偏 估 计 值 2500 BLER -1 0 10 Super cell mode Handover Handover Handover 2000 -500 1500 1000 -1000 500 -2 0 RRU RRU RRU -1500 10 -5 0 5 10 15 20 25 30 0 500 1000 1500 2000 2500 3000 3500 4000 19 20 21 22 23 24 25 SNR logical cell TTI SNR (dB) Double Layer coverage with 1+1 Hot backup Cloud Radio Technology to decrease the to guarantee the network reliability interference and improve the throughput 140.82% 150% 100% 50% 0% Same Frequency Cloud Scheduling Networking eNode B Throughput Comparison Interference optimization and efficient resource allocation in Network level, to improve the spectrum efficiency Jianlin, GUO Chief Engineer , ZTE, China 7 Wednesday, 8th July, 2015, Sessions: 5A - System Improvement -
ZTE LTE-R Solution 1: TDD LTE @ B1G band 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 8 Wednesday, 8th July, 2015, Sessions: 5A - System Improvement -
ZTE LTE-R Solution 2 ： G&L Refarming @900M Refarming with no guard band Step1 GSM-R Step2 GSM-R+LTE-R 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/ LTE-R GSM-R LTE-R VGCS/VBS • P2P , VGCS/VBS • GSM-R: P2P Voice , ETCS, • Dispatching, VGCS/VBS ETCS • Multi-Media • Dispatching LTE-R: CCTV, PIS , Other Dispatching • • data service ETCS • GPRS • CCTV,PIS • P2P Voice • Other data • services ZTE provide Unified SDR Platform Refarming Solution for Railway Operator Jianlin, GUO Chief Engineer , ZTE, China 9 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 loss rate of uplink is less than 7% at the speed 300km/h Performance at high-speed scenario Performance for Shanghai-Hangzhou HSR Terminal access success rate 100% SNR (dB) -3 1 9 13 17 Handover success rate 100% 3km/h (Mbps) 2.8 6.2 14.2 19.6 23 Average throughput of downlink 28Mbps 300km/h (Mbps) 2.8 6.2 13.9 18.3 21.4 Average throughput of uplink 7.2Mbps Loss Rate (%) 0 0 2.11 6.63 6.95 Jianlin, GUO Chief Engineer , ZTE, China 10 Wednesday, 8th July, 2015, Sessions: 5A - System Improvement -
Case 2, Wenzhou City Railway Project Overview • 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 Offered Services • 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. Jianlin, GUO Chief Engineer , ZTE, China 11 Wednesday, 8th July, 2015, Sessions: 5A - System Improvement -
Case 3, CBTC over LTE Trial ZTE has finished CBTC over LTE test, showed excellent performance Performance test item Requirement Result CBTC transmitting ＜ 300ms ＜ 100ms delay CBTC packet loss ＜ 0.5% ＜ 0.1% CBTC handover delay ＜ 150ms ＜ 100ms CBTC handover loss ＜ 0.5% ＜ 0.1% 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 ） TD-LTE could satisfy the requirements of CBTC carrying Jianlin, GUO Chief Engineer , ZTE, China 12 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. Jianlin, GUO Chief Engineer , ZTE, China 13 Wednesday, 8th July, 2015, Sessions: 5A - System Improvement -
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