A Performance Investigation of the Modified PCF with Priority Scheme[J

A modified version of the point coordination func-tion (PCF) in the IEEE 802.11 standard called Mod-ified PCF has been introduced as an approach to im-prove channel utilization over the standard. It has been shown in our previous work that the utiliza-tion of the wireless channel can be significantly im-proved. In this paper, we investigate the performance of the Modified PCF when it is applied with a priority scheme to support prioritization for different traffic types such as interactive voice and video and real-time data. The investigation is done via simulation method. To illustrate the efficiency of the priority scheme, we compare its simulation results with some standardized protocols: the distributed coordination function (DCF), the enhanced distributed channel ac-cess (EDCA), and the standard PCF, and our previ-ously proposed protocol: the Modified PCF without priority scheme. The simulation results show that Modified PCF with priority scheme can provide bet-ter quality of service (QoS) support to different traffic types and also support a higher number of stations which carry data traffic than the previous proposals