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Relay deployment in Orthogonal Frequency Division Multiple Access (OFDMA) based cellular networks helps in coverage extension and/or capacity improvement. In OFDMA system, each user requires different number of subcarriers to meet its rate requirement. This resource requirement depends on the Signal to Interference Ratio (SIR) experienced by a user. Traditional methods to compute blocking probability cannot be used in relay based cellular OFDMA networks. In this paper, the authors present an approach to compute the blocking probability of such networks. They determine an expression of the probability distribution of the user's resource requirement based on its experienced SIR and then classify the users into various classes depending upon their subcarrier requirement.
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