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中文摘要：
由于实时应用对传输时延和抖动相对敏感，为减小WLAN切换过程对实时应用的影响，研究了WLAN切换过程的3个方面：触发切换，AP选择和快速切换算法．充分考虑到方案的可部署性和可扩展性，提出了一个以终端站为中心的快速切换方案．设计实现了基于动态阈值的切换触发机制、基于探寻时延的AP选择机制和信道区分选择结合动态缓存的快速切换算法．该方案完全在站上实现，不需要AP的配合或者对协议进行修改，因而具有良好的鲁棒性和可部署性．通过在实际的hotspot WLAN环境下测试和分析，该快速切换方案有效地减小了切换时延，同时使用户获得的实时应用网络性能有所增强．
英文摘要：
Real-time applications are sensitive to conditions such as transmission delay and jittering. To cut down on the influence generated by the WLAN handoff process, three parts of WLAN （wireless local area networks） handoff： handoff triggering, access point selection and the fast handoff algorithm are investigated. A fast handoff solution totally based on the station is proposed and it is composed of three parts： a handoff triggering mechanism based on dynamic threshold adjustment; an AP selection criterion based on probe delay; a fast handoff algorithm with differentiated channel selection and a dynamic cache. The station based solution is independent with AP＇s collaboration and avoids any changes in the IEEE 802. l l protocol. It is robust and has very good extensibility. Through tests and evaluation in a hotspot WLAN, the solution effectively reduces handoff latency and user experience of real-time applications is enhanced.
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