Abstract: The transmit power is a major radio resource and requires careful planning and control if optimal system performance and maximal user capacity are to be achieved. In this paper, a new power control algorithm based on pricing is proposed in the context of third gener-ation multimedia rnultirate Wideband CDMA (WCDMA) mobile communications. Firstly, the paper defines the multiplication of users data rate and minimum required SIR as users demand of network resource, and then derives the relationship between system capacity, transmit power and normalized demand called network resource share. By introducing uniform-price auction, the paper uses pricing to maximize the social benefit by making efficient allocations of transmit power, when demand exceeds supply which leads to congestion. In the end, numerical results are presented to validate the analytical results and the proposed power control algorithm.