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中文摘要：
对无线局域网（WLAN）中节点（Station）切换过程进行了研究,提出了一种适合流媒体应用的端系统快速切换解决方案.该方案在3个方面进行了改进：通过设置动态切换阈值避免节点的频繁切换;使用平滑因子降低无线信号强度的时变不确定性;利用探询时延选择合适的接入点（AP）.该方案无需对现有AP进行修改,具有较强的可扩展性能.在实际WLAN环境下进行了实现和测试分析,表明该方案能有效地减小切换时延,改善了流媒体在WLAN中的应用.
英文摘要：
The handoff process of station in WLAN（wireless local area network） has been investigated and a streaming media application oriented fast handoff solution is proposed.Its improvements cover three aspects： based on dynamic threshold adjustment frequent handoffs are avoided,a smoothing factor is introduced to reduce the time-varying uncertainty of wireless signal strength,and an appropriate AP（access point） is selected based on probed delay.The solution has a good extensibility without any change to current APs.Tests and evaluation in a hotspot WLAN show that the solution can effectively reduce handoff latency,and the effect of streaming media applications in the WLAN is improved.
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