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Millimeter wave (mm-Wave) frequencies between 6 and 100 GHz provide orders of magnitude larger spectrum than current cellular allocations and allow usage of large numbers of antennas for exploiting beamforming and spatial multiplexing gains. In this paper, we elaborate the main design concepts when integrating mm-Wave radio access networks (RANs) into the fifth generation (5G) system, considering aspects like spectrum, architecture, and backhauling/fronthauling. The corresponding radio resource management (RRM) challenges, extended RRM functionalities for 5G mm-Wave RAN, and RRM splits, are addressed, as well. Finally, based on the previous discussions, a framework is proposed which allows joint backhaul and access operation for 5G mm-Wave RAN, which we envisage as one of the key innovative technologies in 5G. The proposed framework consists of a joint scheduling and resource allocation algorithm to improve resource utilization efficiency with low computational complexity and to fully exploit spatial multiplexing gain for fulfilling user demands.

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We establish a general optimization framework for joint resource allocation and interference mitigation. By utilizing axiomatic interference functions, our problem formulation is very general and includes many problems as special cases. We consider the sum rate maximization problem, which is known to be NP hard. It is shown that due to the structural model of the interference function, the joint optimization of powers and adaptive receive strategies ends up with the optimization solely with respect to powers. This facilitates a reformulation of the problem under consideration as a problem of difference of convex functions (DC). Based on this DC representation, we employ a prismatic branch and bound algorithm to find a global optimum.Index Terms-Optimal resource management, DC programming, interference mitigation, MIMO systems, power control.

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