Research output: Contribution in Book/Report/Proceedings - With ISBN/ISSN › Conference contribution/Paper › peer-review
Research output: Contribution in Book/Report/Proceedings - With ISBN/ISSN › Conference contribution/Paper › peer-review
}
TY - GEN
T1 - Enhancing IEEE 802.11 MAC in congested environments
AU - Aad, I.
AU - Ni, Q.
AU - Barakat, C.
AU - Turletti, T.
PY - 2004
Y1 - 2004
N2 - 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.
AB - 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.
M3 - Conference contribution/Paper
SN - 0780389603
SP - 82
EP - 91
BT - Applications and Services in Wireless Networks, 2004. ASWN 2004. 2004 4th Workshop on
PB - IEEE
CY - New York
T2 - 4th Workshop on Applications and Services in Wireless Networks
Y2 - 9 August 2004 through 11 August 2004
ER -