Abstract
IEEE 802.11e standard is developed for QoS (quality of service) provisioning in WLANs (wireless local area networks). Admission Control is a mechanism that controls throughput of WLANs by managing stations. Evaluation of admission control is accurate ot not which plays aa important roll in QoS support. The motivation of this thesis is calculating WLANs delays with ACs (Access Categories). In this mechanism, we want to guarantee VoIP and video stream’s QoS. VoIP and video streams have uplink and downlink packets. We will calculate the delays of these packets are what. Our mechanism makes delays to three parts. One is propagation delay. Another is the delay that packets queue up in stations or APs (access points). The last is the delay which is wasted by collisions. Because of the most popular application of VoIP and video stream, the second delays are more important than the others. We will focus on the second type delays. Simulation results show that our method is accurate in calculating the delay of packets in WLANs. Keywords: Admission Control, QoS, 802.11e, access category, EDCA