WLC03-4: Adaptive Power and Transmission Rate Control in Cellular CDMA Networks

The UMTS technologies offer a large range of possible transmission rate and power to the mobile users. Setting these values in an adaptive, fair, and optimal way is a challenging issue. After carefully analyzing the system of equations, and applying appropriate changes of variables, we find a formulation where the constraints for capacity are convex. We take advantage of a known analytical solution of the problem for the powers to reformulate the problem on the rates. Then we extract properties from the Kuhn-Tucker conditions to derive an algorithm having almost linear complexity with the number of users. This case turns to be very useful in practice and the algorithm very simple and efficient.