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An Optimized QoS Traffic-Scheduling Algorithm based on HCCA

The IEEE 802.11 e defines the hybrid coordination function (HCF) which specifies the QoS algorithms in the MAC layer of the WLAN. HCF controlled channel access (HCCA) is based on centralized polling mechanism and provides parameterized QoS. This paper proposes an optimized traffic scheduling algorithm for variable bit rate (VBR) over HCCA, which can allocate network resource based on actual flows using dynamic service intervals and transmission opportunity. The simulation results show that the optimized scheduling algorithm can significantly improve the traffic channel utilization, throughput and packet loss ratio.