A Performance Investigation of the Modified PCF with Priority Scheme
Apichan Kanjanavapastit, Björn Landfeldt · Lund University Publications (Lund University) · 2005
A modified version of the point coordination function (PCF) in the IEEE 802.11 standard called Modified PCF has been introduced as an approach to improve channel utilization over the standard. It has been shown in our previous work that the utilization of the wireless channel can be significantly improved. 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 realtime 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 access (EDCA), and the standard PCF, and our previously proposed protocol: the Modified PCF without priority scheme. The simulation results show that Modified PCF with priority scheme can provide better 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.