Author(s) :

Christopher Akinyemi Alabi, Usman A.D., Sani S.M..

Volume/Issue :

Abstract :

Resource allocation in Device-to-Device (D2D) communication generally requires the sharing of allocated spectrum with cellular users in a manner that maximizes available resources without causing adverse effect to Quality of Service (QoS). In a typical scenario, the accommodation of D2D links for spectrum sharing can be hindered by the high rate requirement of either the Cellular Users (CUs) or the D2D links, leading to a limitation in system capacity. This research modifies the existing resource allocation scheme in order to increase the tendency of D2D link admittance for resource sharing with cellular users. D2D links with high rate requirements were split into two virtual links. Each virtual link was then presented for resource sharing with the available CUs at reduced rate requirement - half the link rate requirement of the parent link. Simulation results show that this scheme offers significant improvements in admission probability and ergodic sum rate: 43.60% and 25.23% respectively at a maximum CUE transmit power of 400mW; 34.27% and 8.9% respectively at a reduced maximum transmit power of 250mW. In the two scenarios considered, outage probability remained well below the threshold. Hence, the rate splitting based resource allocation scheme achieved significant increase in system capacity in terms of ergodic sum rate without causing unnecessary outages to cellular links.

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