Joint access and backhaul resource management for ultra-dense networks

Wireless backhauling is a promising technology for Ultra-Dense Networks (UDN). Resource management for access and backhaul is a key issue. Different from conventional resource allocation approaches, we partition radio resources for access and backhaul, taking into account the impacts of cooperative transmission modes. This problem is formulated to maximize the area throughput of UDN to obtain the optimal resource partition and power allocation. It includes two coupling problems and thus is difficult to solve. Firstly we prove the power allocation problem i.e. beamforming problem can be equally decoupled from original problem. And then, the resource partition problem can be converted to a convex optimization problem. Finally, we can get the Pareto optimal solution to the original problem. Simulation results show the gains of the proposed approach.