Source-based network-balanced receive power control with fixed base station assignment in cellular multimedia CDMA systems

Abstract

In this paper, the receive power control (RPC) problem for users with different data rate and service requirements in a cellular code division multiple access (CDMA) system with fixed assignment of mobiles to base stations is analyzed. It is shown that the problem of RPC in a multi-cell multimedia system can be split into two optimization problems: source-based RPC (SBRPC) and network-balanced RPC (NBRPC). SBRPC determines the relative receive power levels (RPLs) between different classes in each cell irrespective of the intercell interference and is locally implemented. NBRPC determines the relative RPLs between cells, can be achieved by solving an eigenvalue problem with system-wide class-wise SIR balancing, and is globally implemented. It can be seen that minimizing the total mobile transmit power via interference balancing among base station receivers sets the reference RPLs for each class of users equally in each cell. An equivalent-bandwidth-based call admission control is also derived based on the solution to the RPC problem. Numerical results are presented to demonstrate the effectiveness of the RPC in a cellular multimedia CDMA system.