Modeling and analysis of preemptive priority based handoffs in integrated wireless mobile networks

In this paper, we propose an analytical modeling for integrated wireless networks with priority reservation and preemptive priority procedures. In our scheme, calls are separated into four different classes: originating voice calls, originating data calls, voice and data handoff request calls. In the proposed scheme, there are queues for handoff request calls. Some number of channels in each cell are reserved exclusively for handoff request calls. Out of this number of channels, some are reserved exclusively for voice handoff requests. The remaining channels are shared by both originating and handoff request calls. Higher priority is given to voice handoff requests over data handoff requests and can preempt the service of ongoing data calls if on arrival it finds no free channels. A three-dimensional Markov chain model is used to determine system performance in terms of blocking probabilities of originating calls, forced termination probability of voice handoff requests calls, and average transmission delay of data calls.