A Combined PUSH/PULL Service Discovery Model for LTE Direct

LTE Device-to-device (D2D) discovery and communication has been considered a means to allow capacity offloading, range extension as well as commercial proximity services such as advertisement or social networking. Within this context, several service discovery approaches may be envisioned. In this paper, we study strategies which rely on a central function supporting service discovery between LTE UEs by push or pull mechanisms. We propose some simplified models to compare them in terms of control overhead and UE energy consumption. Then we propose and evaluate a new approach which combines both PUSH and PULL strategies and highlight the gain that can be achieved on service discovery performances.