A Coordinated Multi-point Handover Scheme for 5G C/U-Plane Split Network in High-Speed Railway

In the 5th generation mobile communication, a heterogeneous network architecture based on control/user (C/U)-plane split will be utilized in high-speed railway communication system. In this network, handover between two adjacent macro cells involves two types of handovers which are macro-macro base station (BS) handover and small-small BS handover. It will increase the complexity of handover, bring more communication interruption and reduce handover success probability. To alleviate the problems, we propose a coordinated multi-point (CoMP) based inter-macro cell handover scheme. Two antennas are deployed at the front and the rear of the train. And the front antenna is connected to target small BS firstly by using CoMP technology. Then handover is triggered according to a simplified trigger decision. Because the target small BS has been connected, only macro-macro BS handover should be performed. Simulation results show that the proposed scheme improves the handover performance.