Modeling of spectrum sharing using ITLinQ scheme in device-to-device networks with full-duplex relays

The wide utilization of frequency spectrum sharing causes problems such as interference as the result of active links' effects on each other. One of the proposed methods to decrease the interference in device-to-device networks is information-theoretic links scheduling (ITLinQ), where it schedules links by using information theory optimally conditions. In this paper, the idea of simultaneous using frequency sharing and reliable full-duplex relaying (FDR) is proposed. Although FDR causes self-interference when the same frequency spectrum is used for reception and transmission at the relays simultaneously, it is shown that the proposed system can increase the transmission rate and coverage area. Moreover, a relay selection scheme to select relays, and a power allocation mechanism between sources and relays to allocate appropriate power are presented. This is investigated by an analytical study to validate the superiority of the proposed method over the ITLinQ scheme in improving the total rate in the network. In addition, the simulation results confirm that by using FDR with the ITLinQ scheme, the better achievable sum-rate of users is obtained.