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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.
Because real-time applications are relatively sensitive to transmission delay and jitter, in order to reduce the impact of WLAN handover process on real-time applications, three aspects of WLAN handover process are studied: trigger handover, AP selection and fast handover algorithm. Deployment and scalability, a fast handover scheme based on terminal station is proposed.A dynamic threshold-based handover triggering mechanism is designed and implemented.An AP selection mechanism and channel distinguishing based on search delay are combined with a fast handover algorithm based on dynamic caching The solution is fully implemented on the station, does not require AP coordination or protocol modification, which has good robustness and deployability.Through the actual hotspot WLAN environment testing and analysis, the fast switching scheme effectively Reduce the switching delay, while enabling users to obtain real-time application network performance has been enhanced.