Handover Algorithm with Position-Power Joint Decision for High-Speed Railway Communication

doi:10.19678/j.issn.1000-3428.0062701

Abstract

Abstract: With the acceleration of China's railway transportation modernization, the demand for communication and information technology in high-speed trains is increasing.Handover is an important part of mobility management for high-speed railway wireless communications.It is of great importance to improve communication quality and operation efficiency and ensure operation safety.To solve the problems of poor handover performance and high ping-pong handover rate of high-speed trains, a handover algorithm based on joint decision of position and power is proposed.Considering the handover threshold as a constraint condition, the optimal handover band is calculated based on channel models and measurement data.Using the unidirectional motion characteristics of high-speed trains, the position information is simplified and the handover process is optimized to effectively avoid ping-pong handover.Considering the correlation between the decision errors of the on-board multi-relay nodes and the position of the handover trigger, the cost function is constructed to determine the optimal prediction parameters, and the weighted statistical linear regression method is used to predict and correct the decision error so that the handover position approaches the optimal handover point.The simulation results show that the handover optimization algorithm can effectively reduce the ping-pong handover rate compared with the A3 algorithm and the distance trigger algorithm.When the train speed is 350 km/h, the handover success rate is more than 99.5%.The handover optimization algorithm can improve the reliability of the communication system, increase the speed of the train and ensure the driving safety.

Key words: high-speed railway, handover trigger standard, relay node, handover algorithm, handover success rate

摘要： 随着我国铁路运输现代化进程的加快，高铁列车对通信信息技术的需求日益提升。越区切换是高铁无线通信移动性管理的重要部分，对提高通信质量和运营效率、确保运营安全具有重要意义。针对高铁列车切换性能差、乒乓切换率高的问题，提出一种位置功率联合判决的越区切换算法。以切换阈值作为约束条件并借助信道模型和测量信息计算得到最佳切换带，利用高铁列车的单向移动特点简化位置信息并优化切换流程，以有效避免乒乓切换现象。考虑到车载多中继节点对切换触发位置的判决误差之间存在相关性，构建代价函数筛选最优的预测参数，采用加权统计线性回归方法预测判决误差并加以纠正，使得切换位置收敛于最佳切换点。仿真结果表明，相对A3算法、距离触发算法，该越区切换优化算法能有效降低乒乓切换率，在列车速度为350 km/h时越区切换成功率达到99.5%以上，其能够提高通信系统的可靠性，推动列车提速并保障行驶安全。

关键词: 高速铁路, 切换触发标准, 中继节点, 越区切换算法, 切换成功率

CLC Number:

U285.2

ZHANG Jiajian, LI Cuiran, XIE Jianli. Handover Algorithm with Position-Power Joint Decision for High-Speed Railway Communication[J]. Computer Engineering, 2022, 48(10): 212-217.

张佳健, 李翠然, 谢健骊. 位置功率联合判决的高铁通信越区切换算法[J]. 计算机工程, 2022, 48(10): 212-217.

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References

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