arXiv subjects

Bo Ai

Publications and source records attributed to Bo Ai.

291 records · Page 17Linked to original sources

arXiv2014

Provide High-QoS of the High-Speed Railway Mobile Communications in Cyber-Physical Systems

Technical advances in networks, embedded computing, and wireless communications are leading to the next generation of complex intelligent systems called Cyber-Physical Systems (CPS). CPS promises to transform the way we interact with the physical world. Efficient and reliable operation of the CTCS-3 (Chinese Train Control System Level 3) is great protection of the national economy and public safety. The CTCS-3 is based on GSM-R (GSM for Railway) to achieve a continuous and two-way transmission of information between ground and the train. To ensure the growing needs of safety, fastness and service diversity of China's railway, the pursuit of high-QoS has been the key of the relative study. This paper examines the main characteristics of GSM-R and the requirements of all-layers' QoS indicators for GSM-R. Several main technologies of improving QoS indicators of all-layers are summarized. As a solution, a comprehensive scheme is proposed to improve the delay and packet loss indicators. An example is also presented that illustrates the real-time features of the proposed solution. Based on the CPS characteristics are highly correlated with the QoS indicators, conclusions are made that GSM-R can provide a reliable and real-time way for message.

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arXiv2014

Evaluation of High-speed Train Communication Handover Models Based on DEA

Broadband communications for high speed train is becoming a main trend in high mobility communications. The main bottleneck of this communication network is handover, since the handover occurs so frequently and the delays are so long that broadband real-time communication cannot apply. Various handover models have been developed and studied recently. However, no comprehensive evaluation method for these models is employed. To this end, we borrow Data Envelopment Analysis (DEA) method to evaluate six typical handover system models. Handover models that to be evaluated are introduced. A brief presentation of DEA and its characters is provided. A specific procedure of the evaluation is proposed. Then the results of the evaluation are obtained by running the DEA. Finally, we give our comments and conclusions to all the handover models. We hope our work will supply a gap in the system evaluation area.

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arXiv2014

A QoS-Aware Scheduling Algorithm for High-Speed Railway Communication System

With the rapid development of high-speed railway (HSR), how to provide the passengers with multimedia services has attracted increasing attention. A key issue is to develop an effective scheduling algorithm for multiple services with different quality of service (QoS) requirements. In this paper, we investigate the downlink service scheduling problem in HSR network taking account of end-to-end deadline constraints and successfully packet delivery ratio requirements. Firstly, by exploiting the deterministic high-speed train trajectory, we present a time-distance mapping in order to obtain the highly dynamic link capacity effectively. Next, a novel service model is developed for deadline constrained services with delivery ratio requirements, which enables us to turn the delivery ratio requirement into a single queue stability problem. Based on the Lyapunov drift, the optimal scheduling problem is formulated and the corresponding scheduling service algorithm is proposed by stochastic network optimization approach. Simulation results show that the proposed algorithm outperforms the conventional schemes in terms of QoS requirements.

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