Abstract
This paper considers a time-division multiple-access system that is designed for voice services and analyzes the effects of adding data services with a given bandwidth allocation protocol. This protocol stipulates priority for voice and movable traffic boundaries, and is unique in that it allocates slots at designated update-interval times. We develop a Markovian analytical model and use it to derive relevant system performance characteristics for voice and data traffic. In the analytical model, reserved and shared slots are separated, and therefore, frame compaction is not applied. We study the effects of reserved data slots on performance and determine the bandwidth available for the data, given a specified level of voice service. Additionally, we explore the optimum update interval that maximizes the data-capacity subject to the specified voice-traffic characteristics. Our analytical model provides a means for studying mixed traffic system dynamics, as well as the effects of different traffic types on the others' performance. It provides an approximation to the bandwidth allocation protocol that allows us to select system parameters without the need for lengthy simulation runs.
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