A Fair Scheduling Mechanism for the IEEE 802.11e Wireless LAN

Abstract

A fair scheduling mechanism called elastic enhanced distributed coordination function (EEDCF) based on the elastic round robin (ERR) is proposed in this paper to improve the enhanced distributed coordination function (EDCF) of the IEEE 802.11e wireless LAN. EEDCF dynamically adjusts the backoff interval according to different priorities and the collision status of different queues using a flexible adjustment procedure to enhance the fairness and transmission efficiency. Observing performance of EEDCF and EDCF in terms of throughput, delay, dropping probability, and fairness etc., we demonstrate that EEDCF outperforms EDCF.