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

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

CLC Number: 

• TN925.93