A Performance Investigation of the Modified PCF with Priority Scheme

In English 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.