Multiple users round trip time CDF probability models in IEEE802.11b WLANS

Multiple Users Round Trip Time Cumulative Distribution Function Probability Models (MURTTCDFPM) in IEEE 802.11b Wireless Local Area Networks (WLANs) have been presented in this paper. To develop the models, field and validation data were collected for various Quality of service (QoS) traffic in three different environments namely: open corridor, small offices and free space for an infrastructure based IEEE802.11b WLAN. The data was categorised into four signal ranges namely: all signals considered, strong signals, grey signals and weak signals. By assuming a normal distribution for the collected field data, MURTTCDFPM were developed and correction factors were applied to improve their prediction accuracy. The MURTTCDFPM developed were compared with existing Single user Round trip time (RTT) Cumulative distribution function (CDF) probability models. The results and the tests conducted show that the MURTTCDFPM have good performances as root mean square (RMS) errors <11.9274495% were observed.Keywords: Round Trip Time, Signal to Noise Ratio, Probability models, IEEE802.11b, WLAN