A novel scheduler for VBR traffic in IEEE 802.11 HCCA WLANs

IEEE 802.11 standard provides a reference design of a simple scheduler and admission control unit. The reference design is suitable for CBR traffic because a fixed TXOP is allocated to a connection during service. This paper proposes a novel scheduler for VBR traffic, where the polling list and TXOP values are dynamically updated to have multiplexing gain. Moreover, an effective admission method is also provided as well to guarantee the loss rate.