Performance evaluation of priority-based multimedia transmissionwith the PCF in an IEEE 802.11 standard wireless LAN

摘要

This paper proposes two kinds of priority scheduling schemes,which are referred to as priority scheme I and priority scheme II, formultimedia transmission with the PCF (point coordination function) ofthe IEEE 802.11 standard MAC protocol. This paper focuses on a singleBSA (basic service area) in an infrastructure network and adopts ahierarchical scheduling architecture. In the architecture, the AP(access point) schedules wireless terminals, and each wireless terminalschedules voice, video and data sources. In priority scheme I, wirelessterminals exert priority control where voice and video transmission isgiven higher priority over data transmission. On the other hand,priority scheme II carries out priority control at both AP and wirelessterminals. By simulation, we compare the performance of priority schemeI, priority scheme II and a non-priority scheme. Numerical results showthat these priority schemes can support a larger number of multimediawireless terminals than the non-priority scheme under the same condition