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通过分析IEEE802.11e的服务质量(QoS)调度机制,讨论了IEEE 802.11e协议给出的基本调度算法(SimpleScheduler)及其支持可变比特速率业务(VBR)时存在的缺陷;针对该算法存在的问题,提出了一种适用于实时VBR业务的调度算法,新算法可以动态地调整服务间隔、每个业务流的发送机会周期(TXOP)与无竞争接入期(CAP)的长度;文章最后给出了两种调度算法的性能详细仿真比较结果。
By analyzing the QoS scheduling mechanism of IEEE802.11e, we discuss the basic scheduling algorithm (SimpleScheduler) given by the IEEE 802.11e protocol and its shortcomings when it supports variable bit rate service (VBR). Based on the existence of the algorithm Problem, a scheduling algorithm is proposed for real-time VBR service. The new algorithm can dynamically adjust the service interval, the TXOP period and the CAP duration of each service stream. Finally, Out of the two scheduling algorithm performance simulation results in detail.