Timer Decision Algorithm for Ping-Pong Handover Control on High-Speed Train in LTE Networks 1800 MHz

Hasanah Putri, Atik Novianti, Tri Nopiani Damayanti


The initial drive test on the Padalarang-Kasugihan railway in Ciroyom road, Andir subdistrict, indicated a handover failure categorized as the ping-pong handover. It is a condition where User Equipment (UE) experiences repeated handovers in a very short time because there is no dominant service. This makes the signal quality received by the user not optimal. This research aims to reduce the effect of ping-pong using a timer decision algorithm in two optimization approaches, namely physical tuning and macrocell. These two optimization methods are considered in the proposed system to evaluate the system handover performance. Timer decision algorithm proposed in high-speed train in LTE Network to control the ping-pong handover effect. This algorithm makes KPI system performance obtained such as Handover Success Rate (HOSR) and Advanced Timing Parameters. Reference Signal Received Power (RSRP), Signal for Interference Noise Ratio (SINR), and throughput more efficient. In the bad spot areas, i.e., where the ping-pong handover occurs, site 2152147 sectors two and site 100539 sectors 3 have the RSRP values of each adjacent sector of -85.97 dBm -87.64 dBm, respectively. After applying these two methods, the physical tuning method is better at eliminating ping-pong handovers. After applying physical tuning to sector two sites 2152147, the RSRP value of each sector becomes -83.25 dBm and -77.73 dBm. Thus, when the user makes a handover from sector three site 100539, there is no ping-pong handover because sector three site 100539 has a more dominant RSRP value. Numerical results show that the parameters in the system have increased. RSRP has increased 19%, SINR has increased 90%, and throughput has increased 17%.

Keywords: timer decision algorithm, ping-pong handover, physical tuning, macrocell, high-speed train.

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