We address the problem of distributed multi cell power control in multi-user transmit beamforming systems. The transmit beamforming vectors are obtained by exploiting the multi-cell uplink-downlink duality, and for fixed beamformers, the downlink power is allocated so as to satisfy certain per user SINR constraints with minimal total power . The proposed scheme is based on measurement of real time intercell-interf erence plus noise (I+N) at the users using an interference projection technique. At each base station (BS), locally available information and the intercell I+N reports from the users can be combined to implement improved distributed multi-cell power control. Simulation results are provided to assess the performance of the proposed technique.