In this paper, we propose an analysis of the joint impact of path-loss, shadowing and fast fading on cellular networks. Two analytical methods are developed to express the outage proba- bility. The ¯rst one based on the Fenton{Wilkinson approach, approximates a sum of log-normal 1 hal-00666681, version 1 - 6 Feb 2012 Author manuscript, published in "EURASIP Journal on Wireless Communications and Networking 2011, 1 (2011) 137" DOI : 10.1186/1687-1499-2011-137 random variables by a log-normal random variable and approximates fast fading coe±cients in interference terms by their average value. We denote it FWBM for Fenton-Wilkinson based method. The second one is based on the central limit theorem for causal functions. It allows to approximate a sum of positive random variables by a Gamma distribution. We denote it CLCFM for central limit theorem for causal functions method. Each method allows to establish a simple and easily computable outage probability formula, which jointly takes into account path-loss, shadowing and fast fading. We compute the outage probability, for mobile stations located at any distance from their serving BS, by using a °uid model network that considers the cellular network as a continuum of BS. We validate our approach by comparing all results to extensive Monte Carlo simulations performed in a traditional hexagonal network and we provide the limits of the two methods in terms of system parameters. The proposed framework is a powerful tool to study performances of cellular networks, e.g., OFDMA systems (WiMAX, LTE).