An Expedited Predictive Distributed Antenna System Based Handover Scheme for High-Speed Railway

High-speed train (HST) has drawn considerable attention and become one of the most preferable conveyance mechanisms. Every year the manufacture corporations achieve a higher speed record and expect to attain 1000 km/h by 2021 using hyperloop one technology. Moving at such a high speed results in a high handover rate which makes it challenging for high speed railway (HSR) mobile wireless communication to preserve steady link performance. Employing distributed antenna systems (DASs) along with the two-hop architecture, this paper proposes a fast predictive handover algorithm. In this strategy, the serving cell starts the handover preparation phase in advance by inferring the train's current location. Issuing the handover preparation phase in advance reduces the handover latency and handover command failure probability as well. Lower handover command failure probability means lower handover failure probability which could greatly improve the end-users' quality of services (QoS). The analytical results show that the proposed scheme outperforms the conventional handover scheme.