Development of Prioritized Handoff Scheme for Congestion Control in Multimedia Wireless Network

The rapid increase in the use of mobile devices demand the need to meet different multimedia application requirements of the users. However, the application demand and allocation could lead to congestion if the network has to maintain such high resources for the quality of service (QoS) requirements of the applications. In this paper, a new admission control policy for wireless mobile multimedia networks is being proposed. Two kinds of traffics are assumed to compete for the access to the limited number of frequency channels available in each cell: Real-time and non-real-time calls. The calls are further categorized as new real-time and non-real-time calls or real-time and non-real-time handoff calls. Hot spot calls are given priority over cold spot calls if the cold spot request is non-real-time. Call of the same cell and priority are served using ticket scheduling. Blocked new real-time and non-real-time calls are lost, while blocked real-time and non-real-time handoff calls can wait in the handoff buffer for channel to be available. The system is modelled by a multidimensional Markov chain, and a numerical analysis would be presented to calculate the blocking probabilities of the calls. The scheme would also be simulated using extensive runs to investigate its performance.