Evaluation of Quality of Service Schemes for IEEE 802.11 Wireless LANs

Authors:
Anders Lindgre;Olov Schelén;Andreas Almquist
Affiliations:
-;-;-
Venue:
LCN '01 Proceedings of the 26th Annual IEEE Conference on Local Computer Networks
Year:
2001

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Abstract

This paper evaluates our mechanisms or providing ser-vice differentiation in IEEE 802.11 wireless LANs, the PointCoordinator Function (PCF)of IEEE 802.11, the EnhancedDistributed Coordinator Function (EDCF) of the proposedIEEE 802.11e extension to IEEE 802.11, Distributed FairScheduling (DFS), and Blackburst using the ns-2 simulator.The metrics used in the evaluation are throughput,mediumutilization, collision rate, average access delay, and delaydistribution or a variable load of real time and backgroundtraffic.PCF performance is comparably low, while EDCFperforms much better.The best performance is achieved byBlackburst.DFS provides relative differentiation and con-sequently avoids starvation of low priority traffic.