Enhancing spectral efficiency in LTE-D2D networks

Base Stations (BSs) in LTE networks face heavy traffic demand from User Equipments (UEs) for voice, online gaming, video calls, file transfers, etc., We consider a LTE Device-to-device (D2D) network where LTE UEs have primary access to the spectrum and D2D pairs have secondary access. In order to offload traffic from BS and to enhance spectral efficiency, operators can activate multiple D2D pairs within the serving BS coverage area, by reusing the same radio resources across the primary LTE UEs and different D2D pairs. However the reuse of spectrum by D2D pairs may not be sufficient to offload the entire user traffic demand in the LTE cellular network. In this context, we propose to enable more D2D secondary users in the serving cell, by utilizing neighboring BS spectrum to fairly co-exist with neighboring LTE primary users.