In The Ieee 802.11 Wireless Lan Performance Analysis

In the recent years, Wireless Local Networks (WLANs) have a rapid development of their convenience, quickly establishment and high credibility. These advantages make the research on Wireless Local Networks become an important part in the fields of networks. Because of data transmission of IEEE 802.11 WLANs using a wireless channel, collision and interference are not avoidable. WLANs use a carrier sense multiple access mechanism, which leads to more control frames, to solve the problems brought by a wireless channel. Because of the overhead, people are interested in the real throughput performance of 802.11 WLANs. Then many analytic models appear.We compared and analyzed the analytic models which had appeared comprehensively. To overcome the disadvantages of these models, we propose a improved model to estimate the saturation throughput of IEEE 802.11 for a lossy channel. This model, involved in capture effects and backoff freezing procedures, is based on elementary conditional probability arguments. Then the paper uses this model to analyze the performance of the basic access and RTS/CTS access mechanisms of IEEE 802. 11b.This model, with different data rates, applies to both ideal channel and lossy channel conditions in performance analysis of IEEE 802.11 WLANs. Simulation results show that the analysis accurately predicts the saturation throughput.