Design of TETRA-based dedicated radio communication system for urban rail transit

2012 ◽  
Author(s):  
Wei Qi ◽  
Yu Xin ◽  
Du Chengxin ◽  
Li Suwen
Keyword(s):  
Communication System ◽  
Urban Rail Transit ◽  
Rail Transit ◽  
Radio Communication ◽  
Urban Rail ◽  
Radio Communication System

Research on the Key Issues of the Civil Communication Resource Management for Urban Rail Transit

2014 ◽  
Vol 505-506 ◽  
pp. 410-414
Author(s):  
Jian Xun Zhang ◽  
Bao Ming Han
Keyword(s):  
Communication System ◽  
Information Service ◽  
Value Added ◽  
Urban Rail Transit ◽  
Rail Transit ◽  
Urban Rail ◽  
Key Issues ◽  
The One ◽  
Maintenance Personnel ◽  
Urban Rail Transit Network

The civil communication system in urban rail transit network is the one which can provide the passenger value-added service. It can meet underground needs of information service for passengers, and be the alternate means of communication for drivers, equipment maintenance personnel, the stations duty officers, and so on. When the wireless systems for rail transit comes malfunction, the civil communication system can provides smooth information channel for rail transit participants to ensure the safety of personnel and rail transit dispatching.

scholarly journals The QoS Indicators Analysis of Integrated EUHT Wireless Communication System Based on Urban Rail Transit in High-Speed Scenario

2018 ◽  
Vol 2018 ◽  
pp. 1-9 ◽  
Author(s):  
Xiaoxuan Wang ◽  
Hailin Jiang ◽  
Tao Tang ◽  
Hongli Zhao
Keyword(s):  
Wireless Communication ◽  
Communication System ◽  
High Speed ◽  
Urban Rail Transit ◽  
Rail Transit ◽  
Transit System ◽  
Wireless Communication System ◽  
Handoff Latency ◽  
Urban Rail ◽  
Set Up

Nowadays, in urban rail transit systems, train wayside communication system uses Wireless Local Area Network (WLAN) as wireless technologies to achieve safety-related information exchange between trains and wayside equipment. However, according to the high speed mobility of trains and the limitations of frequency band, WLAN is unable to meet the demands of future intracity and intercity rail transit. And although the Time Division-Long Term Evolution (TD-LTE) technology has high performance compared with WLAN, only 20 MHz bandwidth can be used at most. Moreover, in high-speed scenario over 300 km/h, TD-LTE can hardly meet the future requirement as well. The equipment based on Enhanced Ultra High Throughput (EUHT) technology can achieve a better performance in high-speed scenario compared with WLAN and TD-LTE. Furthermore, it allows using the frequency resource flexibly based on 5.8 GHz, such as 20 MHz, 40 MHz, and 80 MHz. In this paper, we set up an EUHT wireless communication system for urban rail transit in high-speed scenario integrated all the traffics of it. An outdoor testing environment in Beijing-Tianjin High-speed Railway is set up to measure the performance of integrated EUHT wireless communication system based on urban rail transit. The communication delay, handoff latency, and throughput of this system are analyzed. Extensive testing results show that the Quality of Service (QoS) of the designed integrated EUHT wireless communication system satisfies the requirements of urban rail transit system in high-speed scenario. Moreover, compared with testing results of TD-LTE which we got before, the maximum handoff latency of safety-critical traffics can be decreased from 225 ms to 150 ms. The performance of throughput-critical traffics can achieve 2-way 2 Mbps CCTV and 1-way 8 Mbps PIS which are much better than 2-way 1 Mbps CCTV and 1-way 2 Mbps PIS in TD-LTE.

scholarly journals QoS-Aware Resource Allocation for Network Virtualization in an Integrated Train Ground Communication System

2018 ◽  
Vol 2018 ◽  
pp. 1-12
Author(s):  
Li Zhu ◽  
Fei Wang ◽  
Hongli Zhao
Keyword(s):  
Resource Allocation ◽  
Communication System ◽  
Communication Systems ◽  
Network Virtualization ◽  
Base Station ◽  
Urban Rail Transit ◽  
Normal Operation ◽  
Rail Transit ◽  
Resource Allocation Algorithm ◽  
Urban Rail

Urban rail transit plays an increasingly important role in urbanization processes. Communications-Based Train Control (CBTC) Systems, Passenger Information Systems (PIS), and Closed Circuit Television (CCTV) are key applications of urban rail transit to ensure its normal operation. In existing urban rail transit systems, different applications are deployed with independent train ground communication systems. When the train ground communication systems are built repeatedly, limited wireless spectrum will be wasted, and the maintenance work will also become complicated. In this paper, we design a network virtualization based integrated train ground communication system, in which all the applications in urban rail transit can share the same physical infrastructure. In order to better satisfy the Quality of Service (QoS) requirement of each application, this paper proposes a virtual resource allocation algorithm based on QoS guarantee, base station load balance, and application station fairness. Moreover, with the latest achievement of distributed convex optimization, we exploit a novel distributed optimization method based on alternating direction method of multipliers (ADMM) to solve the virtual resource allocation problem. Extensive simulation results indicate that the QoS of the designed integrated train ground communication system can be improved significantly using the proposed algorithm.

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