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

Authors:
X. James Dong;Mustafa Ergen;Pravin Varaiya;Anuj Puri
Affiliations:
-;-;-;-
Venue:
LCN '03 Proceedings of the 28th Annual IEEE International Conference on Local Computer Networks
Year:
2003

Citing 0
Cited 4

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Abstract

In IEEE 802.11 wireless LANs, the DCF access methodand the PCF access method operate alternatively withina superframe to service the time-varying traffic demands.Due to different medium access mechanisms deployed byDCF and PCF, they work well for some particular types oftraffic scenarios respectively, while their performance maydegrade under some other types of traffic demands. Noneof them can keep high performance under all types of trafficdemands. In this paper, we propose an adaptive control algorithmto keep the aggregate throughput of access pointsclose to the best capacity of both DCF mode and PCF modeupon various traffic requests, by dynamically adjusting theduration of DCF mode and PCF mode within a superframebased on recent traffic scenarios in wireless LANs. We modifiedthe MAC module of IEEE 802.11 wireless LANs inOPNET to support our algorithm. Extensive simulationshave been done using OPNET. The simulation results showthat high performance of access points is achieved duringthe dynamic traffic demands. The new control algorithmonly requires simple extensions to the MAC layer of accesspoints and is compatible with the MAC layer definedin IEEE 802.11 standard.