Cellular communication systems that support both voice calls and background data calls arising from various platform types having different mobility characteristics are considered. Hand-off problems of voice and data calls are studied. A tractable analytical model for traffic performance is developed using multidimensional birth-death processes. Preemptive priority is used to assure transparency to voice calls. We examine two possible strategies for handling preempted data calls. One is a prioritized scheme and the other is non-prioritized scheme. Theoretical traffic performance characteristics are calculated. For voice calls, blocking probability and forced termination probability are calculated. The possible causes of data call termination are considered. These include forced termination probability of a data call and pushed-out failure probability. The expected waiting time of data calls is also determined.
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