Abstract
The wireless access network with the capability for people to access information anytime and anywhere has attracted much attention in recent years. The IEEE 802.11 wireless local area network (WLAN) can offer high data rates through IEEE 802.11a and IEEE 802.11b technologies [5]. In this thesis, we emphasize how to improve the performance of the 802.11 MAC protocol. We present a Priority-Based Contention Control (PCC) scheme to well manage the contention for the medium among the wireless stations (STA) in the IEEE 802.11 wireless LAN, and, the PCC scheme has the following advantages: providing service differentiation among the traffic flows with different priorities and easing off the serious collisions in high traffic loads.