Precise bandwidth allocation scheme in broadband wireless multimedia networks

Bandwidth is extremely valuable resource in wireless networks, in which the occurrence of handoff increases. Therefore, an effective bandwidth allocation is urgent. Recently, the dynamic method using stochastic control is found to be preferred. But the dynamic control for multi-services is still a problem. The main challenges come from variety of requirements of bandwidth, traffic characteristics, QoS guarantee and handoff rate. Moreover, the computational complexity is another challenge. In this paper, we set up a novel bandwidth allocation model. We consider optimal revenue instead of maximal bandwidth utility, the boundary conditions and the variety of channel occupation. In addition, we use a fast numerical method to reduce complexity. As a result, we get a precise multi-services dynamic bandwidth allocation scheme called MDBA to adapt for multiple types of services in broadband wireless networks. Numerical results of simulation show that our scheme steadily satisfies the hard constraint on call dropping probability of multi-services while maintaining a high channel utility.