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The IEEE 802.11e standard guarantees QoS in the MAC layer by using new HCF (Hybrid Coordination Function) protocol. The HCF is composed of two access functions: a distributed contention-based channel access function (EDCA) providing prioritized QoS and a centralized polling-based channel access function (HCCA) providing parameterized QoS. In this paper, the authors propose a new scheduling algorithm for HCCA to support QoS. The proposed scheduler guarantees QoS by using adaptive service intervals, transmission opportunities, and polling order. The service schedule is based not only on the traffic's TSPEC parameters but also on the instance buffered traffic conditions and transmission delay of other traffic.
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