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This paper presents a problem of queuing theoretic performance modeling andanalysis of Orthogonal Frequency Division Multiple Access (OFDMA) underbroad-band wireless networks. We consider a single-cell WiMAX environment inwhich the base station allocates sub channels to the subscriber stations in itscoverage area. The sub channels allocated to a subscriber station are shared bymultiple connections at that subscriber station. To ensure the Quality ofService (QoS) performances, two Connection Admission Control (CAC) schemes,namely, threshold-based and queue-aware CAC schemes are considered at asubscriber station. A queuing analytical framework for these admission controlschemes is presented considering OFDMA-based transmission at the physicallayer. Then, based on the queuing model, both the connection-level and thepacketlevel performances are studied and compared with their analogues in thecase without CAC. The connection arrival is modeled by a Poisson process andthe packet arrival for a connection by a Markov Modulated Poisson Process(MMPP). We determine analytically and numerically different performanceparameters, such as connection blocking probability, average number of ongoingconnections, average queue length, packet dropping probability, queuethroughput and average packet delay.

Performance Modelling and Analysis of Connection Admission Control in OFDMA based WiMAX System with MMPP Queuing