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In order to reach better Quality-of-Service (QoS) requirements for multimedia application, the 802.11e task group was formed and has proposed EDCA (Enhanced Distributed Channel Access) for contention period and HCCA(HCF Controlled Channel Access) for contention-free period in the HCF (Hybrid Coordination Function) to enhance the original IEEE 802.11 Medium Access Control (MAC) protocol. However, the problem of choosing the right set of MAC parameters and strict QoS mechanism to provide guaranteed QoS in IEEE 802.11e Wireless Local Area Networks (WLANs) remains unsolved. In this paper, a pragmatic Call Admission Control (CAC) scheme with a novel polling based uplink scheduling policy for CBR traffic in IEEE 802.11e WLANs is proposed.
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