An optimal distributed call admission control for adaptive multimedia in wireless/mobile networks

There is a great demand on multimedia applications with quality of service (QoS) in wireless/mobile networks. In this paper, we propose an optimal call admission control (CAC) framework with a bandwidth re-allocation (BRA) algorithm for adaptive multimedia services in wireless/mobile networks, where the bandwidth of an ongoing call is time-varying during its lifetime. The optimization is in the sense of optimizing the revenue and satisfying QoS requirements. We adopt a semi-Markov decision process (SMDP) approach to model both the CAC and the BRA at the same time. The proposed approach allows us to make decisions on CAC as well as on BRA. The simplex method in linear programming is used to solve the optimal decision problem. Numerical results reveal that the proposed CAC-BRA scheme adapts itself well to time-varying multimedia traffic, achieves optimal revenue and satisfies QoS up to the upper-bound handoff blocking probability.