Improving Coverage-Capacity Tradeoff and Power Consumption of TDMA-CDMA by Coverage-Dependent Timeslot Allocation

Cellular CDMA systems have to trade user capacity to increase cell coverage. Moreover, coverage of CDMA is uplink-limited because uplink channels are not orthogonal and transmit powers of mobile stations are limited. In this paper, we propose a coverage-dependent dynamic channel allocation (DCA) method for TDMA-CDMA. In this method, different uplink timeslots have different level of coverage-capacity tradeoff, i.e., Non-homogeneous coverage-capacity tradeoff (NHCCT). This method reduces uplink power consumption and improves coverage-capacity tradeoff, compared to load balancing DCA method. Finally, we verify our approach by numerical analysis and simulation.