Game theoretical power control for open-loop network MIMO systems with partial cooperation

Network MIMO is considered to be a key solution for the next generation wireless systems in breaking the interference bottleneck in cellular systems. In the network MIMO systems, open-loop transmission scheme is used to support mobiles with high mobilities because the BSs do not need to track the fast varying channel fading. In this paper, we consider an open-loop network MIMO system with L BSs serving L+1 mobiles based on partial cooperation where all the L BSs cooperatively serve a cell-edge MS. Exploiting the heterogeneous path loss between cell-center MS and cell-edge MS, each of the L BS also serves a cell-center MS non-cooperatively. We first propose a flexible open-loop SDMA scheme to address potential issues associated with dynamic and heterogeneous MIMO configurations and to adjust the long-term power allocation between the cell-edge MS (cooperatively served by L BSs) and the cell-center MS at each of the L BSs, we formulate the long-term distributive power control problem using game theoretic approach. Through numerical simulations, we show that the proposed open-loop SDMA scheme with distributed long-term power allocation can achieve significant performance advantages over the other reference baseline schemes.