The issue of spectrum scarcity in wireless networks is becoming prominent and critical with each passing year. Although several\npromising solutions have been proposed to provide a solution to spectrum scarcity, most of them have many associated tradeoffs.\nIn this context, one of the emerging ideas relates to the utilization of cognitive radios (CR) for future heterogeneous networks\n(HetNets). This paper provides a marriage of two promising candidates (i.e., CR and HetNets) for beyond fifth generation (5G)\nwireless networks. More specifically, a joint power allocation and user assignment solution for the multiuser underlay CR-based\nHetNets has been proposed and evaluated. To counter the limiting factors in these networks, the individual power of transmitting\nnodes and interference temperature protection constraints of the primary networks have been considered. An efficient solution is\ndesigned from the dual decomposition approach, where the optimal user assignment is obtained for the optimized power allocation\nat each node. The simulation results validate the superiority of the proposed optimization scheme against conventional\nbaseline techniques.
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