Performance Analysis of Prioritized Call Admission Control Schemes for Integrated Traffic in Wireless Network

Wireless/mobile communication systems are becoming increasingly popular in recent years. As the wireless resources are scarce, it is important to allocate resources efficiently and carefully, in order to achieve maximum output. The call admission control schemes play a significant role in providing the desired quality of service (QoS) by judiciously assigning the radio channels that are available in a micro cell. In this paper, we present two call admission control (CAC) schemes for wireless mobile network, (i) Prioritized call admission control (PCAC) scheme (S1) and (ii) Prioritized call admission control scheme with releasing function (S2). Both schemes support integrated traffic i.e. data and voice for both new and handoff attempts. Guard channel concept is used to give the priority to the handoff attempts. To admit more handoff attempts in the cellular system, buffering process is used for the handoff attempts. The concept of balking and reneging is also incorporated for both the schemes. The calls arrive in poisson fashion whereas channel holding time and cell residence times are exponentially distributed. The arrival rate of handoff attempts is computed by using iterative algorithm. Various performance metrics such as blocking probability of new call, blocking probability of handoff data/voice attempts, time out probability of handoff data/voice attempts, force termination probability of handoff data/voice attempts, waiting time of handoff data/voice attempts, carried load, etc. are determined. The sensitivity analysis has also been carried out to facilitate the insights of controllable parameters for real time systems. Keyword – Wireless mobile network, Call admission control, Handoff attempts, Priority, Balking, Reneging, Guard-channels, Releasing function, Blocking.