Modeling and Performance Analysis of Cellular Networks with Handoff Calls Waiting

山中 佐知子 (9851121)

Blocking of handoff calls is one of the negative drawbacks in cellular networks from users' point of view. Therefore the traditional channel management policy and its numerous variants reserve some number of radio channels exclusively for handoffs. However, such idea cannot necessarily lead to an efficient resource sharing strategy. In this paper, we consider a system that allows handoff calls to wait in a queue while they are in handoff areas if there is no channel available. We mathematically model this system by applying queueing theory. Then, we analyze its performance to derive the forced termination probability of handoff calls, the blocking probabilities of new calls and handoff calls, and the Laplace Stieltjes transform for the distribution of waiting time in a queue. In numerical examples, the system is compared with traditional ones with respect to quality of service. We also divide our system into two half-rate and examine how changes quality of service.