Optimum transmitter power control in cellular radio systems

In cellular radio systems, transmitter power controls aim at achieving acceptable carrier-to-interference (C/I) ratios in all active communication links. All of the existing power control schemes focus on single channel control, which could not guarantee optimal performance if applied to the whole system containing multiple channels. This paper presens a full optimization model for the transmitter power control problem which deals with all channels and cells in the system simultaneously. With the limitations of computational speed and data updating ability, the present model, at this moment, may not be appropriate for real-time power control. Rather, the model provides a performance standard that various practical real-time power control methods can achieve. This is important information in the design of a practical real-time system. To solve the optimization model, the authors use the Lagrangian relaxation technique. The present computational result shows that it is possible to reduce the overall blocking probability by 20-50% over the existing power control schemes.