A handoff scheme with probability-based channel borrowing in integrated wireless mobile networks

We propose and analyze a handoff scheme with channel borrowing in integrated wireless mobile networks. Channels in each cell are divided into two parts and pre-allocated to real-time and non-real-time services. Each type of service is allowed to borrow channels from the other under certain conditions. A non-real-time service call can borrow an unused channel assigned to real-time service but it can be preempted by a real-time service call. A real-time service call borrows a channel from non-real-time service with a certain probability which depends on the number of available idle non-real-time service channels. We model the system by a six-dimensional Markov chain and compute the system performance in terms of blocking probability of originating calls, forced termination probability of real-time service calls, and average transmission delay of non-real-time service calls. The proposed scheme maximizes the resource utilization and keeps a certain quality of service (QoS) for each service at the time of congestion.