A Multi-Criteria Handover Scheme for Distributed Antenna System Based High-Speed Rail Wireless Communications

High-speed railway (HSR) has become one of the most preferable modes of transportation. With increased train speed, the rail wireless communication faces lots of challenges. One of them is the handover problem. The high handover failure rate and frequent handover due to the fast moving speed can cause serious communication interruption. In order to achieve seamless handover for HSR system, this paper utilizes distributed antenna systems (DASs) along with duallayer architecture and proposes an improved handover scheme based on multi-criteria. The proposed handover scheme improves both the handover triggering probability and handover success rate, demonstrated by both the theoretical analysis and simulation results. The simulation results also show that the proposed scheme outperforms the traditional handover trigger scheme.