Rapid On-Off-Division Duplex Based on Successive Interference Cancellation

In this paper, we propose SIC-RODD by introducing successive interference cancellation (SIC) into rapid on-off division duplex (RODD). SIC-RODD extends traditional RODD to support a novel base station (BS) communication mode. Moreover, to provide higher access capability for multiple user equipments (UEs), the BS in SIC-RODD performs power domain non-orthogonal multiple access (NOMA) for downlink transmission to UEs. Considering both uplink and downlink transmission that SIC is used at the receiving end, we jointly optimize the uplink and downlink time slot allocation in RODD and downlink power allocation in NOMA, with the goal to minimize the energy consumption of the BS. This leads to an intractable mixed-integer linear programming problem, for which to tackle we first transform the original problem into an equivalent DC (difference of two convex functions) program, and then propose an iterative algorithm based on the constrained concave-convex procedure to find the optimal solution. Simulation results demonstrate that SIC-RODD can significantly reduce downlink power consumption at BS as well as increase the number of accessed UEs compared with existing RODD systems.