Energy efficient interference-aware resource allocation in LTE-D2D communication

TLDR

Interference management is critical in LTE‑A D2D communication because orthogonal subcarriers lose their isolation when D2D operates under cellular users, making the choice of spectrum bands a key issue. The study proposes two novel resource‑allocation schemes: a cell‑level scheme to mitigate D2D–cellular interference and a user‑level scheme to schedule resources energy‑efficiently. The cell‑level scheme reduces interference between D2D and cellular users, while the user‑level scheme allocates resources to minimize energy consumption per bit. Simulation results show the schemes achieve higher throughput and significantly lower energy cost per bit compared to conventional methods.

Abstract

Interference management is an important subject in Device to Device (D2D) communication when underlying a LTE-A cellular band. By default, in LTE-A there is negligible intra-cell interference due to the orthogonality of the subcarriers but this orthogonality will be lost when D2D communication takes place under cellular users (CU). Therefore, one of the key aspects of D2D communication is the set of spectrum bands in which D2D communication takes place. Hence, in this paper we will propose two novel resource allocation (RA) schemes: the first RA scheme (cell level) mitigates the interference between D2D and CU and the second RA scheme (user level or scheduling) schedules the resources in an energy efficient way between D2D and CU. These RA schemes increase the throughput and reduce the overall energy cost per bit of the system. Afterwards, these schemes are compared with the conventional methods and the simulation results show that the proposed schemes obtain higher throughput and save significant amount of energy per bit.