Enhancing IEEE 802.11 MAC in congested environments

Aad, I and Ni, Q and Barakat, C and Turletti, T (2005) Enhancing IEEE 802.11 MAC in congested environments. Computer Communications, 28 (14). pp. 1605-1617. ISSN 0140-3664

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IEEE 802.11 is currently the most deployed wireless local area networking standard. 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, the contention level is more likely to change slowly, and resetting the CW causes new collisions and retransmissions before the CW reaches 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 highly congested environments. (c) 2005 Elsevier B.V. All rights reserved.

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Computer Communications
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04 Nov 2012 15:59
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21 Nov 2022 23:03