The combination of non-orthogonal multiple access in millimeter-wave communication called as mmWave-NOMA is capable of supporting more data streams with a larger number of users to cope up with the increasing traffic demand. In this paper, an energy-efficient scheme for downlink mmWave-NOMA systems with joint user grouping, scheduling, and optimal power allocation with the objective of energy efficiency maximization is proposed.Enhanced k-means clustering for user grouping which can handle the possible simultaneous access of network to enhance the sum throughput is proposed. Weighted sum algorithm-based scheduling where weights are calculated based on the service requirement of the users to maximize the sum rate and a proportional-based scheme of power allocation modeled as a resource allocation problem considering the beam gain and discrimination weight of each user for energy-efficient power allocation is discussed. The simulation results show that the proposed scheme is energy efficient than the conventional mmWave orthogonal multiple access systems.
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