LAUSR

In the emerging cooperative non-orthogonal multiple access (NOMA) systems, an important design issue is to incentivize mobile relays (MRs) to participate in the cooperative process and achieve a win–win situation to both the base station (BS) and MRs under asymmetric information, where the BS does not know the channel state information of MRs and NOMA users. As a promising remedy, we apply the adverse selection model from contract theory and derive the optimal feasible contract set for MRs with different wireless characteristics (types). Based on the contracts accepted by all the MRs, we further propose an efficient MR selection scheme for the original combinatorial optimization. The efficiency of the proposed incentive mechanism is verified through the simulation results.