Abstract
This paper presents the analysis of CDMA cellular networks with channel subβrating. From users' point of view, our considered scheme gives higher priority to handoff calls over new calls by subβrating the existing connections when handoff calls find no idle channels upon their arrivals. Therefore, it is considered that the disadvantage of the soft handoff which needs more channels than the hard handoff is made up for. Handoff calls can also wait in a queue while they are in handoff areas if all channels are subβrated in the cell of interest. We mathematically model this scheme by applying queueing theory. Then, we analyse its performance to derive the blocking probabilities of the new and handoff calls, the probability that handoff calls leave the handoff area without getting new channels, the degradation ratio of the voice quality by subβrating, mean and coefficient of variation of the waiting time of handoff calls. In numerical results, the analytical results are compared with the simulation ones to validate our analytical approach. Moreover, we compare the subβrating scheme with fullβrating one with respect to some characteristic values to show the effect of subβrating. Copyright Β© 2005 John Wiley & Sons, Ltd.