Handover Optimization Algorithm in LTE High-Speed Railway Environment

The traditional A3 event-based HO algorithms are mainly designed for the low speed (<30 m/s) networks. That aren’t suitable for the high-speed railway scenario which the link quality may deteriorate sharply and the wireless channel environment may become unstable with the increase of velocity. To overcome the disadvantages of the handover algorithms in LTE high-speed railway networks, we proposed a handover optimization algorithm based on statistics, where we not only consider reference signal received power and reference signal received quality at the same time but also the rate of cell resources change. The simulation results show that the proposed algorithm has higher handover success rate and lower handover numbers. Thus unnecessary handover is reduced by up to 47 % and the novel algorithm provides success rate of 0.5–13.9 % higher than the classical A3 algorithm under different conditions of velocity, and greatly improve handover performance.