铁道标准设计2018，Vol.62Issue(4)：176-180,5.DOI:10.13238/j.issn.1004-2954.201704170003
基于实时动态迟滞的LTE-R切换算法优化研究
Research on Optimization of LTE-R Handover Algorithm Based on Real-time Dynamic Hysteresis
杜涛 1陈永刚 1李德威2
作者信息
- 1. 兰州交通大学自动化与电气工程学院,兰州 730070
- 2. 中车青岛四方车辆研究所,青岛 266031
- 折叠
摘要
Abstract
The current LTE-R handover algorithm uses fixed handover hysteresis when switching, or grades train speeds to adjust the dynamic hysteresis,fulfilling only"local dynamic",which highlights the importance of determining a more accurate switching trigger point. First of all, to put forward the switching scheme, the distance between the transition zone and the switching section of the LTE-R network overlay coverage area is deduced based on actual channel model. In order to improve the handover success rate and optimize the performance of the system in the high-speed environment, a handoff optimization algorithm is proposed based on real-time dynamic hysteresis. The handover hysteresis values at different speeds are obtained by using the ping-pong handover rate and wireless link failure rate. Then,the least squares method is used to obtain the best function match between the train speed and the switching hysteresis. Simulation results show that the improved algorithm has higher handover success rate than the current handover algorithm,which proves that the proposed scheme can trigger the switch more effectively than the current scheme.关键词
LTE-R/切换触发点/重叠覆盖区/实时动态迟滞/切换成功率Key words
LTE-R/Switching trigger point/Overlapping coverage area/Real-time dynamic hysteresis/Switching success rate分类
交通工程引用本文复制引用
杜涛,陈永刚,李德威..基于实时动态迟滞的LTE-R切换算法优化研究[J].铁道标准设计,2018,62(4):176-180,5.
