Admission control with traffic shaping for variable bit rate traffic in IEEE 802.11e WLANs

With the increasing popularity of using WLANs for Internet access, the controlled channel access mechanism in IEEE 802.11e WLANs, HCCA, has received much more attentions since its inherent centralized mechanism is more efficient in handling time-bounded multimedia traffics. So far, only a few research works address the admission control problem of variable bit rate (VBR) traffic over HCCA. These existing works consider each traffic flow individually and thus cannot exploit the statistical multiplexing gain among multiple VBR traffic flows. In this paper, we apply the existing statistical multiplexing works to the studied admission control problem with all the features of 802.11e HCCA being taken into consideration. Experimental results show that our proposed admission control achieves significant improvement in network utilization while still satisfying all the QoS requirements.