Performance analysis of handoff algorithm using relative RSS measurements and random direction-lock in GSM-R
Performance analysis of handoff algorithm using relative RSS measurements and random direction-lock in GSM-R
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DOI：
10.1049/cp.2009.1943
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发表时间：
2009
期刊：
影响因子：
--
通讯作者：
Y. Li;Y. S. Yan
中科院分区：
文献类型：
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作者：
Y. Li;Y. S. Yan
在GSM-R系统中对提出的基于相对RSS测量和随机方向锁定的切换算法进行了评估。由于GSM-R的单层和线性小区部署，列车司机产生的呼叫的目标小区通常是沿着铁路轨道确定的。因此，只有当相对RSS(接收信号强度)测量超过预定滞后时，才会发生方向与列车运行方向一致的切换；而当相对RSS测量超过预定滞后时，且随机方向锁打开时，才会发生方向与列车运行方向不一致的切换。仿真结果表明，与单一滞后的传统切换算法相比，该切换算法的平均切换次数减少了约25%。
It's evaluated in GSM-R that the proposed handoff algorithm using relative RSS measurements and random direction-lock. Due to the single layer and linear cell deployment in GSM-R, the target cell of the call produced by the train driver is usually definite along the railway trajectory. So, the handoff, whose direction is consistent with the train's running direction, occurs only if the relative RSS (Received Signal Strength) measurement exceeds the pre-defined hysteresis; but, the handoff, whose direction is inconsistent with the train's running direction, occurs when not only the relative RSS measurement exceeds the pre-defined hysteresis, but also the random direction-lock is open. Finally, it's found that the proposed handoff algorithm could reduce the average number of handoffs about 25%, compared with the conventional handoff algorithm with a sole hysteresis.