摘要：The article presents an analytical model of wireless networks using the IEEE 802.11protocol to access the transport medium. The model allows to determine such key factors of the quality ofservice as transmission delays and losses. The model is based on diffusion approximation approach whichwas proposed three decades ago to model wired networks. We show that it can be adapted to take intoconsideration the input streams with general interarrival time distributions and servers with general servicetime distributions. The diffusion approximation has been chosen because of fairly general assumptionsof models based on it, hard to be represented in Markov models. A queueing network model can havean arbitrary topology, the intensity of transmitted flows can be represented by non-Poisson (even selfsimilar)streams, the service times at nodes can be defined by general distributions. These assumptions areimportant because of the CSMA/CA algorithm, the overall times needed to sent a packet are far from beingexponentially distributed and therefore the flows between nodes are non-Poisson. Diffusion approximationallows us also to analyse the of transient behaviour of a network when traffic intensity is changing withtime
