Problem formulation for joint cooperative downlink scheduling and power allocation for joint processing coordinated multipoint

The true potential of the orthogonal frequency divisional multiple access (OFDMA)coordinated multipoint (CoMP) is in turning the adverse effects of the inter-cell interference (ICI) into the system performance gains. The small ultra-dense deployments of data-hungry users in the forthcoming generations of wireless mobile access systems, namely the long term evolution (LTE) A as 4G and the subsequent 5G, will be pushing for the revolutionary innovations to accommodate the required peak rates and the reliability in the cell edge. CoMP has been identified as a competent solution to exploit the interference in the cell-edge. To this end, we consider the non-coherent joint processing (JP) mode of CoMP in the downlink (DL) of an LTE system. Here, we formulate the problem of the joint cooperative scheduling and transmit power allocationas a hybrid mixed integer non-convex optimization problem. In particular, the transmit power allocation is based on the allocation of the time-frequency resources according to a proportionally fair (PF) utility function with certain CoMPspecific constraints on the transmission.This problem formulation serves a two-fold purpose of both the interference coordination under a full frequency reuse regime and the inherent interference mitigation capabilities.