Adaptive Handover Algorithm for LTE-R System in High-Speed Railway Scenario
Adaptive Handover Algorithm for LTE-R System in High-Speed Railway Scenario
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DOI：
10.1109/access.2021.3073917
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发表时间：
2021
期刊：
影响因子：
3.9
通讯作者：
Yong Chen;Kaiyu Niu;Zhen Wang
中科院分区：
文献类型：
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作者：
Yong Chen;Kaiyu Niu;Zhen Wang
随着高速铁路的快速发展，LTE-R通信系统对切换成功率提出了更高的要求。提出了一种基于随机抑制的高速铁路自适应切换算法。该算法建立了滞后门限与列车速度之间的椭圆函数关系，使滞后门限随列车速度自适应调整，降低了高速列车前向切换的难度。同时引入正态分布随机数抑制反向切换，以降低乒乓切换率。最后，在不同的场景下验证了算法的有效性。仿真结果表明，与传统的A3算法相比，本文提出的基于随机抑制的自适应切换算法能够提高切换触发概率和切换成功概率，避免乒乓切换率的增加。
With the rapid development of high-speed railway, the LTE-R communication system has more requirements for the handover success rate. An adaptive handover algorithm based on random suppression in high-speed railway scenario is proposed. The algorithm establishes an elliptic function relationship between the hysteresis threshold and the train speed, so that the hysteresis threshold can be adjusted adaptively with the train speed, which lessens the challenge of high-speed train forward handover. At the same time, the normal distribution random number is introduced to suppress the reverse handover in order to reduce the ping-pong handover rate. Finally, the effectiveness of the algorithm is verified in different scenarios. Simulation results show that compared with the traditional A3 algorithm, the proposed adaptive handover algorithm based on random suppression can improve the handover trigger probability and handover success probability and avoid the increase of ping-pong handover rate.