Hungarian Method Based Joint Transmission Mode and Relay Selection in Device-to-Device Communication

The concept of Device-to-Device (D2D) communication has been introduced for local area connectivity as a means to improve the cellular spectrum utilization and to reduce the energy consumption of user equipments. The performance of D2D communication is practically limited due to large distance and/or poor channel conditions between the D2D transmitter and receiver. To overcome these issues, a relay-assisted D2D communication has been introduced where a device relaying is an additional transmission mode along with the existing cellular and D2D transmission modes. In this paper, a transmission mode assignment algorithm based on the Hungarian algorithm is proposed to improve the overall system throughput. The proposed algorithm tries to solve two problems: a suitable transmission mode selection for each scheduled transmissions and a device selection for relaying communication between user equipments in the relay transmission mode. Simulation results show that our proposed algorithm could improve the system performance in terms of the overall system throughput and D2D data rate.