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IEICE Transactions on Communications 2008 E91-B(4):1122-1131; doi:10.1093/ietcom/e91-b.4.1122
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Copyright © 2008 The Institute of Electronics, Information and Communication Engineers

Regular Section -- Papers -- Terrestrial Radio Communications

Performance Analysis of IEEE 802.11 DCF and IEEE 802.11e EDCA in Non-saturation Condition*

Tae Ok KIM1, Kyung Jae KIM1 and Bong Dae CHOI1

1 The authors are with the Department of Mathematics and Telecommunication Mathematics Research Center, Korea University, Seoul, Korea. E-mail: violetgl{at}korea.ac.kr; kimkjae{at}korea.ac.kr; queue{at}korea.ac.kr


  Abstract

We analyze the MAC performance of the IEEE 802.11 DCF and 802.11e EDCA in non-saturation condition where device does not have packets to transmit sometimes. We assume that a flow is not generated while the previous flow is in service and the number of packets in a flow is geometrically distributed. In this paper, we take into account the feature of non-saturation condition in standards: possibility of transmission performed without preceding backoff procedure for the first packet arriving at the idle station. Our approach is to model a stochastic behavior of one station as a discrete time Markov chain. We obtain four performance measures: normalized channel throughput, average packet HoL (head of line) delay, expected time to complete transmission of a flow and packet loss probability. Our results can be used for admission control to find the optimal number of stations with some constraints on these measures.

Key Words: IEEE 802.11e protocol, Markov model, performance evaluation, quality of service (QoS)

Manuscript received May 25, 2007. Manuscript revised November 13, 2007.

* This research is supported by the MIC, under the ITRC support program supervised by the IITA. Bong Dae Choi is corresponding author.


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