An Optimized Seamless Dual-Link Handover Scheme for High-Speed Rail

作者：Yu, Xinchun; Luo, Yuan^*; Chen, Xujian

来源：IEEE Transactions on Vehicular Technology, 2016, 65(10): 8658-8668.

DOI：10.1109/TVT.2015.2508485

• Communication interruption probability (CIP)
• handover failure probability (HFP)
• high-speed rail (HSR)
• seamless handover

In high-speed rail (HSR) with Long-Term Evolution (LTE) technology, the wireless communication quality of service (QoS) is enormously degraded because of the unstable signal and frequent handover. Recently, a seamless handover using two antennas on the top of a train has been introduced to provide a better user experience. The two antennas are mounted on the front and the rear of the train, respectively, so that one performs handover, and the other is communicating. A bicasting mechanism is adopted to eliminate the delay and overhead of data forwarding. In this paper, we consider a new algorithm to optimize the handoff opportunity by investigating not only the hysteresis exceeding level but the signal strength of both antennas as well. The parameter selection in the algorithm is analyzed based on a probability model. Furthermore, a set of new handover procedures, which optimize the utilization of the two antennas, is proposed to decrease the overhead and improve the QoS of the users. Accordingly, numerical results show that the handover failure probability (HFP) and the communication interruption probability (CIP) are both obviously reduced.

• 出版日期2016-10
• 单位上海交通大学