关键词: 高速场景, 无线网络切换, 迟滞余量, 切换成功率, 乒乓切换触发率

Abstract: When the speed optimization algorithm improves the success rate of switching in high-speed railways, the problem of sharp increase of ping-pang trigger probability exists. To solve this problem, an optimized handover algorithm based on location is proposed by analyzing the influence of hysteresis and location on the ping-pang trigger probability and handover success probability. A subtraction function relationship is established between the hysteresis and the terminal location in this algorithm. The problem of increasing the ping-pang trigger probability or reducing the switching success rate when using the same hysteresis margin in different location of overlapping area is solved by use of the hysteresis decreasing with the increase in distance between terminal and source base stations. The simulation results show that, compared to speed optimization algorithm, the proposed handover algorithm based on position information can improve the switching success rate while avoiding the increase of ping-pang trigger probability.

Key words: high-speed scenario, wireless handover, hysteresis margin, handover success probability, ping-pang trigger probability