A strategy for time-slot assignment in TD-CDMA/TDD systems

Abstract

We consider the TD-CDMA/TDD multiple access scheme to support asymmetrical multimedia traffic between an uplink and downlink. The TD-CDAM/TDD scheme manages two-dimensional channel; time and code. The channel resource is divided by a switching-point on the time axis into uplink and downlink channels. Positioning the switching-point according to traffic load distributions on both uplink and downlink is very important to efficiently manage the channel resource. In this paper, we propose a mathematical model to analyze the performance of TD-CDMA/TDD systems in terms of the call blocking probability and find the optimum switching-point to efficiently manage the channel resource considering the up/down traffic load distributions for various kinds of service applications.