Joint Power and Backhaul Bits Allocation for Coordinated Multi-Point Transmission
In this paper, the authors study the problem of backhaul sharing in network MIMO. In case of a backhaul of limited number of bits, they investigate how to allocate these bits jointly with the base-stations power among users in order to maximize the sum-rate under fairness constraints. Firstly, they study this problem with the assumption of one user per cell. They find that binary allocation of power is optimal. Then, the multi-user case is considered. A solution of the optimization problem is developed under high Signal-to-Interference and Noise Ratio (SINR). They prove that under these assumptions, backhaul bits allocation among the cells or among the users of each cell has no effect on the sum-rate of system.