Efficient dual-association resource allocation model of train-ground communication system based on TD-LTE in urban rail transit

2016 ◽  
Author(s):  
Xiaoxuan Wang ◽  
Hailin Jiang ◽  
Wenzhe Sun ◽  
Tao Tang
Keyword(s):  
Resource Allocation ◽  
Communication System ◽  
Urban Rail Transit ◽  
Rail Transit ◽  
Allocation Model ◽  
Resource Allocation Model ◽  
Urban Rail

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.

Research on Urban Rail Transit Resource Allocation Based on K-Shortest Paths Algorithm

2013 ◽  
Vol 748 ◽  
pp. 1285-1289 ◽  
Author(s):  
Ju Mei Shen ◽  
Yong Sheng Shen ◽  
Lin Xu
Keyword(s):  
Resource Allocation ◽  
Search Algorithm ◽  
Shortest Paths ◽  
Flow Distribution ◽  
Urban Rail Transit ◽  
Rail Transit ◽  
Rail Network ◽  
Assignment Model ◽  
Urban Rail ◽  
Major Factors

This paper considers the major factors of passenger flow distribution and the running cost of train, explains and demonstrates how to sove the problem of urban rail transit resource allocation. The paper at first constructs urban rail network assignment model in the multiple operating lines based on the k-shortest paths algorithm, then proposes the k shortest paths search algorithm, finally the effectiveness of the model and algorithm are verified with the data from the Beijing urban rail transit network.

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 Research on passenger flow forecast of Urban Rail Transit

2020 ◽  
Vol 213 ◽  
pp. 03026
Author(s):  
Xiao Li
Keyword(s):  
Public Transport ◽  
Urban Rail Transit ◽  
Design Stage ◽  
Rail Transit ◽  
Allocation Model ◽  
Passenger Flow ◽  
Planning And Design ◽  
Dongguan City ◽  
Urban Rail ◽  
Flow Forecast

Urban rail transit has the characteristics of large traffic volume, fast and convenient, so it has become the urban passenger transport mode which is given priority in the planning and design of each city. The prediction and analysis of rail transit passenger flow is a very important part in the planning and design stage. And it also provides important basic data for urban rail planning, construction and operation. When the rail transit network needs to be adjusted, the passenger flow forecast is also an essential step. In this paper, Taking Dongguan urban rail transit line 2 as an example, based on the full consideration of the uniqueness of Dongguan urban rail transit and the prediction of various social and economic indicators of Dongguan City, the “four step method” is adopted to forecast passenger flow. Through the investigation of resident’s travel survey, we can master the current travel distribution of all modes. Based on the analysis of land use change, traffic development policy and related influencing factors of Dongguan City, the trip distribution of each characteristic year is predicted. Then, the OD matrix of public transport (including subway and conventional public transport) is obtained through the study of traffic mode division model, and the predicted rail passenger flow is obtained through the allocation model of cooperation and competition. In the stage of passenger flow assignment, the influence of various factors on travel route selection is comprehensively considered in the public transport allocation model. Finally, the prediction index and sensitivity of rail passenger flow are analyzed.

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 Calculation Method for Load Capacity of Urban Rail Transit Station considering Cascading Failure

2018 ◽  
Vol 2018 ◽  
pp. 1-12 ◽  
Author(s):  
Jiajun Huang ◽  
Feng Zhou ◽  
Mengru Xi
Keyword(s):  
Load Capacity ◽  
User Equilibrium ◽  
Calculation Model ◽  
Urban Rail Transit ◽  
Cascading Failure ◽  
Rail Transit ◽  
Allocation Model ◽  
Quantitative Calculation ◽  
Urban Rail ◽  
Transit Station

The load capacity of urban rail transit station is of great significance to provide reference in station design and operation management. However, it is difficult to carry out quantitative calculation quickly and accurately due to the complex interaction among passenger behaviors, facility layout, and the limit capacity of single facility. In this paper, the association network of facilities is set up based on the analysis of passenger service chain in station. Then the concept of cascading failure is introduced to the dynamic calculation model of load capacity, which is established on the user-equilibrium allocation model. The solution algorithm is optimized with node attack strategy of complex network to effectively reduce the computational complexity. Finally, a case study of Lujiabang Road Station in Shanghai is carried out and compared with the simulation results of StaPass, verifying the feasibility of this approach. The proposed method can not only search for the bottleneck of capacity, but also help to trace the loading variation of facilities network in different scenarios, providing theoretical supports on passenger flow organization.

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