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Modeling and Analysis of a Hybrid CAC Scheme in Heterogeneous Multimedia Wireless Networks

A hybrid call admission control CAC scheme for a heterogeneous multimedia mobile network is proposed and investigated. In addition to the reservation of the system capacity to the cells, the network center also reserves an amount of bandwidth for a possible dynamic allocation to all cells in order to increase the system utilization and minimize the blocking probability of calls. In each cell, a specific class of calls may need a specific bandwidth for connection, a specific call connection time period, and may possess a specific mobility feature. By considering the specific characteristics for different classes of calls, each cell of the network has the capability to provide service to at least a minimum number of calls for each class. This paper successfully derives an analytical expression for the stationary distribution of the number of calls in the whole network and obtains explicit mathematical formulae for measuring system performance, including the utilization of the network, the blocking probability for each class of calls, and the throughput of the network. The consistency of the numerical analysis with the theoretical results and the simulation analysis based on the model description confirms the correctness of the modeling and analysis.