I. Introduction
In recent years, due to the increased demand for using the wireless communication systems in a satisfactory manner, a promised Quality of Service (QoS) is required to manage the incoming new calls and handoff calls more efficiently. To provide QoS to the user's handoff is a key element in wireless cellular networks. It should be used efficiently as the capacity of all cellular systems is limited. Numerous studies on handoff prioritization schemes have been available in literature [1]–[3]. Among those handoff prioritization schemes, queueing handoff schemes drew attention because handoff failures can be reduced with a relatively small increase in new call blocking probability [3]. Various performance issues for different call admission control (CAC) schemes have been proposed to balance the new call blocking and handoff dropping in order to provide the desired QoS requirements [4]–[5]