Research output: Contribution to Journal/Magazine › Journal article › peer-review
Research output: Contribution to Journal/Magazine › Journal article › peer-review
}
TY - JOUR
T1 - Enhancing IEEE 802.11 MAC in congested environments
AU - Aad, I
AU - Ni, Q
AU - Barakat, C
AU - Turletti, T
PY - 2005/9/1
Y1 - 2005/9/1
N2 - 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.
AB - 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.
KW - Wireless communications
KW - IEEE 802.11
KW - MAC
KW - CSMA/CA
KW - Simulations
KW - Markov chains
U2 - 10.1016/j.comcom.2005.02.010
DO - 10.1016/j.comcom.2005.02.010
M3 - Journal article
VL - 28
SP - 1605
EP - 1617
JO - Computer Communications
JF - Computer Communications
SN - 0140-3664
IS - 14
ER -