| Summary: | 碩士 === 國立成功大學 === 電腦與通信工程研究所 === 105 === Recently, network densification is considered an important solution to the unrelentingly increased of mobile users and their traffic demands. However, User Equipment (UE) in High Speed Railway (HSR) suffer from frequently handovers that cause dramatical network overhead since the coverage region of small Base Stations (BSs) are far less than that of macro BSs. We propose a location-assisted handover for C/U-plane split network architecture. In the considered scenario, a Mobile Relay (MR) is installed on the HSR and serves in-train UEs who execute handover simultaneously. Based on C/U-plane split network architecture, the macro BS assigns an appropriate target BS for the MR during movement. We consider the unique characteristic of HSR, i.e., the train moves in a fixed trajectory, and it is thus possible to predict the forthcoming BSs and complete the handover procedure in a timely fashion. We divide the coverage of the macro BS into the center region and border region. When the MR is in the center region, the handover request is sent immediately when macro BS detects a target sector with better Received Signal Received Power (RSRP). For the MR in the border region, the approaching BS is chosen as the target BS and counting Time to Trigger (TTT) used in the standard handover procedure is eliminated to speed up the handover procedure. System-level simulations are conducted and the results indicate that the proposed handover scheme provides higher UE throughput and reduce the connection cost compared to the standard Long Term Evolution (LTE) handover scheme.
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