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Enhancing IEEE 802.11 MAC in congested environments

Aad, I. and Ni, Q. and Barakat, C. and Turletti, T. (2004) Enhancing IEEE 802.11 MAC in congested environments. In: Applications and Services in Wireless Networks, 2004. ASWN 2004. 2004 4th Workshop on. IEEE, New York, pp. 82-91. ISBN 0780389603

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Abstract

IEEE 802.11 is the most deployed wireless local area networking standard nowadays. It uses carrier sense multiple access with collision avoidance (CSMA/CA) to resolve contention between nodes. Contention windows (CW) change dynamically to adapt to the contention level: Upon each collision, a node doubles its CW to reduce further collision risks. Upon a successful transmission, the CW is reset, assuming that the contention level has dropped. However, contention level is more likely to change slowly, and resetting the CW causes new collisions and retransmissions before reaching the optimal value again. This wastes bandwidth and increases delays. In this paper we analyze simple slow CW decrease functions and compare their performances to the legacy standard. We use simulations and mathematical modeling to show their considerable improvements at all contention levels and transient phases, especially in high congested environments.

Item Type: Contribution in Book/Report/Proceedings
Subjects: Q Science > QA Mathematics > QA75 Electronic computers. Computer science
Departments: Faculty of Science and Technology > School of Computing & Communications
ID Code: 59624
Deposited By: ep_importer_pure
Deposited On: 19 Nov 2012 11:16
Refereed?: No
Published?: Published
Last Modified: 01 Apr 2014 11:14
Identification Number:
URI: http://eprints.lancs.ac.uk/id/eprint/59624

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