摘要： 移动终端在AP间切换产生的时延和抖动严重影响实时业务的质量。通过分析移动终端切换的过程和现有的改进方案，提出一种基于动态域值的扫描触发机制，有效地避免移动终端在静止和AP信号较好条件下的cache更新。在STA上实现基于动态域值触发扫描的分片cache的更新算法，该算法在保证cache及时更新的同时降低每次更新cache的开销且能有效减小切换时延。
关键词:
无线局域网,
快速切换,
分片cache,
IEEE802.11协议
Abstract: The latency and jittering produced by handoff between Access Points(APs) has a serious and negative impact on the quality of the real-time service. Through analysis of the process of handoff and existing improvement program, this paper proposes a scanning trigger mechanism based on dynamic domain values, which effectively avoids cache updates when STA is stable and the associated AP’s signal is good. This mechanism and a slice cache update algorithm are realized on the STA, which ensure timely update the cache and reduce the cost of each cache update and the handoff delay.
Key words:
Wireless Local Area Network(WLAN),
fast handoff,
slice cache,
IEEE802.11 protocol
中图分类号:
徐 伟;杨 怡;陶 军. 基于移动终端的WLAN快速切换方案[J]. 计算机工程, 2009, 35(14): 135-137.
XU Wei; YANG Yi; TAO Jun. Fast Handoff Solution Based on STA for WLAN[J]. Computer Engineering, 2009, 35(14): 135-137.