Stochastic Model Based Opportunistic Spectrum Access in Wireless Networks

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The authors present a stochastic model based opportunistic channel access and transmission scheme for cognitive radio-enabled secondary users for single data channel. They refer to this scheme as RIBS (Residual Idle Time Distribution based Scheme). In this scheme, the SU uses residual white space distribution to estimate its transmission duration such that the probability of its interference with PU is less than a predefined threshold value. They derive analytical formulae for computing the average raw SU frames per transmission operation, average raw SU throughput, and the average sensing overhead for SU. Using simulation experiments, they show that using RIBS, SU can use the channel opportunistically without violating the interference probability constraint.