Study on Improvement of Handover in Relay Communication Systems using UAV

High frequency bands such as millimeter wave and terahertz wave are utilized to enable the use of wide band capable of large data communication. However, the throughput of the uplink tends to deteriorate more than that of the downlink. Therefore, we think that the throughput improvement of the uplink can be carried out by relaying UAV (Unmanned Aerial Vehicle) with the relay communication function. When performing relay communication, it is necessary to switch UAVs for relay communication and base stations for communication by handover (HO) in accordance with the movement of user terminals (UEs). In the conventional method, the system capacity and UE throughput may decrease since HO decision is performed with only RSRP (Reference Signal Received Power). Therefore, we have proposed a new HO method using not only RSRP but also system capacity and UE throughput and show the results of computer simulation.