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In this paper, we consider a single-cell IEEE 802.16 environment in which thebase station allocates subchannels to the subscriber stations in its coveragearea. The subchannels allocated to a subscriber station are shared by multipleconnections at that subscriber station. To ensure the Quality of Service (QoS)performances, two Connection Admission Control (CAC) mechanisms, namely,threshold-based and queue-aware CAC mechanisms are considered at a subscriberstation. A queuing analytical framework for these admission control mechanismsis presented considering Orthogonal Frequency Division Multiple Access (OFDMA)based transmission at the physical layer. Then, based on the queuing model,both the connection-level and the packet-level performances are studied andcompared with their analogues in the case without CAC. The connection arrivalis modeled by a Poisson process and the packet arrival for a connection byBatch Markov Arrival Process (BMAP). We determine analytically and numericallydifferent QoS performance measures (connection blocking probability, averagenumber of ongoing connections, average queue length, packet droppingprobability, queue throughput and average packet delay).

Analysis of Quality of Service Performances of Connection Admission Control Mechanisms in OFDMA IEEE 802.16 Network using BMAP Queuing