Device-to-device (D2D) communications utilising licensedudspectrum have been considered as a promising technologyudto improve cellular network spectral efficiency and offload localudtraffic from cellular base stations (BSs). In this paper, we developudIunius: a peer-to-peer (P2P) system based on harvesting data in audcommunity utilising multi-hop D2D communications. The Iuniusudsystem optimises D2D communications for P2P local file sharing,udimproves user experience, and offloads traffic from the BSs. TheudIunius system features cross-layer integration of: 1) a wirelessudP2P protocol based on the Bittorrent protocol in the applicationudlayer; 2) a simple centralised routing mechanism for multi-hopudD2D communications; 3) an interference cancellation techniqueudfor conventional cellular (CC) uplink communications; and 4) audradio resource management scheme to mitigate the interferenceudbetween CC and D2D communications that share the cellularuduplink radio resources while maximising the throughput ofudD2D communications. Simulation results show that the proposedudIunius system can increase the cellular spectral efficiency, reduceudthe traffic load of BSs, and improve the data rate and energyudsaving for mobile users.
展开▼
