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A Novel Handover Reduction Mechanism Based on UE’s Moving Direction and Velocity

In this paper, we propose an efficient handover (HO) trigger mechanism (HOTE) in the fifth generation (5G) New Radio (NR) mobility management communication systems with directional antenna beams. Finding the better beam pair (between RX-beams and TX-beams) by evaluating the received signal strength indicator (RSSI) value (or received power or Signal-to-Interference plus Noise power Ratio (SINR) in [1]) for specific reference signals from multiple beams at the user equipment (UE) side based on the synchronization signal block (SSB) that is periodically transmitted by the base station (gNB) has been adopted in handover management. However, the HO rate will increase when a UE is traversing the cell edge due to the UE’s movement and rotation (called Ping-pong phenomenon). Due to the lack of efficient handover management, the traditional HO management selecting the beam pair with the strongest RSSI value can hardly achieve the expected signaling cost performance. Improving the HO performance is a pressing problem in millimeter-wave (mm-wave) communication system, to this end, we propose an effective method, HOTE, the UE with multi-beam firstly selects the most stable gNB avoiding the Ping-pong phenomenon and then chooses the strongest beam pair guaranteeing HO performance according to the criteria. In this way, the system occurs HO events (inter-beam handover is preferred, followed by inter-cell handover) avoiding excessive HO rate causing the expensive signaling overhead between transmitter-side and receiver-side. Our analysis and simulation results demonstrate that the proposed trigger mechanism shows up to above 45% HO performance in the average handover rate, which would greatly reduce the signaling overhead of system.