Improving the Aggregate Throughput of Access Points in IEEE 802.11 Wireless LANs

In IEEE 802.11 wireless LANs, the DCF access method and the PCF access method operate alternatively within a superframe to service the time-varying traffic demands. Due to different medium access mechanisms deployed by DCF and PCF, they work well for some particular types of traffic scenarios respectively, while their performance may degrade under some other types of traffic demands. None of them can keep high performance under all types of traffic demands. In this paper, we propose an adaptive control algorithm to keep the aggregate throughput of access points close to the best capacity of both DCF mode and PCF mode upon various traffic requests, by dynamically adjusting the duration of DCF mode and PCF mode within a superframe based on recent traffic scenarios in wireless LANs. We modified the MAC module of IEEE 802.11 wireless LANs in OPNET to support our algorithm. Extensive simulations have been done using OPNET. The simulation results show that high performance of access ...

• Type: Conference
• Year: 2003
• Where: LCN
• Authors: X. James Dong, Mustafa Ergen, Pravin Varaiya, Anuj Puri
• Keywords: IEEE 802.11, LCN 2003, Traffic Demands, Wireless Lans