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A Network Assisted Fast Handover Scheme for High Speed Rail Wireless Networks

In high speed rail wireless networks, handover between evolved Node Bs(eNBs) occurs frequently, and the probability of handover failure is dramatically increased, thus seriously degrading the users' experience. To tackle this issue, this paper proposes a network-assisted mobile relay (MR)- controlled fast handover scheme. Under this scheme, the serving eNB provides, in advance, the network assistance information about the available resources of the target eNB, to MR. The MR then makes the handover decision based on continual measurements. Different from the conventional handover scheme, in the proposed scheme, the handover decision is made by the MR instead of eNB. Simulation results show that this scheme can effectively improve handover performance, in terms of handover failure and communication interruption probabilities.