Performance analysis of an uplink power control using truncated channel inversion for data traffic in a cellular CDMA system

Abstract

Truncated channel inversion is a form of power control that suspends mobile transmission when the wireless channel is in a bad condition. This paper systematically analyzes the performance of this scheme in a cellular CDMA system. We develop a queueing model to describe the stochastic behavior of a mobile's power activity. The system throughput, queueing delay, and power consumption are investigated using the model. Numerical results show that the truncated channel inversion scheme substantially improves throughput and reduces battery power consumption at the cost of extra queueing delay, which mainly depends on how fast the channel condition changes. We find that the truncated scheme works well, even for moderate mobile velocities.