Modelling and Performability Analysis of WLANs as a Queuing Model with Channel/Access Point Failures and Reconfiguration

Wireless local area networks (WLANs) have experienced great popularity in the past decade. There is no doubt that WLANs are prone to failures. In order to improve the quality of service (QoS), performance characteristics of such systems should be considered together with the system availability modelling and evaluation which are associated with failures and recovery. This paper presents an analytical model for perform ability modelling and evaluation of a WLAN. The spectral expansion method is employed for the exact solution of the analytical model considered. The proposed analytical model and its solution can be used to evaluate the perform ability measures of such systems efficiently and accurately. Various perform ability measures such as mean queue length and blocking probability are computed and presented.