An optimized relay handover algorithm in TD-LTE along high-speed railway

Handover (HO) is one of the key procedures, which ensures user equipment (UE) moving smoothly in long term evolution (LTE) systems. Generally, hard handover has a high outage probability and is relatively simple, but when the velocity of UE is high, the procedure may be unreliable, especially for VoIP service. In the special scenario high-speed railway, network deployment is known and an optimized relay algorithm could be applied according to information already known, such as cell deployment and direction of UE running. Simulation results show that algorithm proposed performs better than the traditional hard handover in high-speed railway networks.