  Need for increased spectral efficiency is key to improve the quality of
experience for next-generation wireless applications like online gaming, HD
Video, etc.,. In our work, we consider an LTE Device-to-device (D2D) network
where LTE UEs have primary access to the spectrum and D2D pairs have secondary
access. To enhance spectral efficiency, BS can offload the traffic by
activating multiple D2D pairs within the serving cell. This ensures that the
same radio resource will be reused across the primary LTE UEs and different D2D
pairs. 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. We model the system and show via extensive
simulations, that the above configuration guarantees good throughput for the
D2D pairs in the serving cell while ensuring that the primary LTE throughput
demand is not compromised.
