In this paper, availability modelling for the 3GPP R99 network architecture is presented The analytical availability modelling approach has been used. Analytical availability models can be broadly classified into two groups: non-state space (e.g. reliability block diagrams) and state-space models (e.g. Markov models). These models are briefly discussed. The reliability block diagram method is easier to use and has been applied to model the availability of the 3GPP R99 network architecture. An example network with a number of various network elements is considered for availability modelling. The numerical results are presented. The reliability block diagram method is suitable to capture overall availability of a network. However, in order to model features such as software failure, reconfigurations, and fault tolerance, state space modelling approach is needed.
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