The impact of backoff, EIFS, and beacons on the performance of IEEE 802.11 wireless LANs

摘要: In late 1997, IEEE standardized the physical layers and medium access for wireless local area networks. This paper presents a performance study of distributed coordination function, fundamental contention based mechanism. Most studies adopt unchecked simplifying assumptions or do not reveal all details simulation model. We develop stochastic Petri net model, which captures relevant system aspects in concise way. Simulation allows to quantify influence many mandatory features standard on performance, especially backoff procedure, extended interframe spaces, timing synchronisation function. also serves identify conditions when commonly used analytical modeling are justified.