Performance Evaluation of IEEE 802.11e EDCA with DCF Improvement Algorithms

Authors:
Sueng Jae Bae;Hyung Joo Ki;Min Young Chung
Affiliations:
School of Information and Communication Engineering, Sungkyunkwan University, Kyunggi-do, Korea 440-746;School of Information and Communication Engineering, Sungkyunkwan University, Kyunggi-do, Korea 440-746;School of Information and Communication Engineering, Sungkyunkwan University, Kyunggi-do, Korea 440-746
Venue:
ICCSA '08 Proceeding sof the international conference on Computational Science and Its Applications, Part I
Year:
2008

Citing 4
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Throughput and delay performance of IEEE 802.11e enhanced distributed channel access (EDCA) under saturation condition

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Abstract

In IEEE 802.11 standard, distributed coordination function (DCF) uses binary exponential backoff (BEB) algorithm to resolve collisions. However, performance of DCF with BEB decreases as the number of contending stations increases. To solve this problem, enhanced gentle DCF (EGDCF) and binary negative-exponential backoff algorithm (BNEB) have been proposed. In EGDCF algorithm, each station counts the number of consecutive successful transmissions in present backoff stage. If the number of consecutive successful transmissions reaches the predefined maximum value, station decreases its backoff stage. BNEB algorithm maintains a maximum contention window size during collisions and reduces a contention window size into half after complete transmission without retransmission. Since these two algorithms control backoff stage and contention window based on estimation of the number of stations, they improve performance of DCF. However, DCF cannot support differential quality of services (QoS) So IEEE 802.11e has adopted EDCA for contention-based medium access mechanism. In this paper, we adopt EGDCF and BNEB algorithms into EDCA to effectively support differentiated services in wireless LAN. We evaluate performance of conventional EDCA and EDCA with EGDCF and BNEB under saturation environment.