Enhancing multimedia QoS with device-to-device communication as an underlay in lte networks

We present in this paper a new device-to-device (D2D) communication scheme to create a QoS enhanced multimedia services for LTE users who are physically close to each other. This scheme has a potential to provide higher bandwidth service with reduced delay and reduced power consumption. However, a significant challenge from such D2D opportunity is to establish the direct link between nearby devices without interference to other regular LTE users. In this research, we develop a novel user selective resource allocation scheme that allows D2D links to share the same radio resources with LTE regular users while proactively avoiding the interferences with intelligent user selection. The main contribution of the proposed scheme is in the innovative design of the sub-channel selection algorithms for both D2D links and regular LTE users. These algorithms serve dual purpose: (1) providing desired QoS enhancement to multimedia consumers in D2D links while minimizing the interference to regular users; (2) maximizing the sum rate of the LTE networks considering the interference from D2D links and the fairness issue. The simulation results show that the total achievable capacity of LTE networks is dramatically enhanced by D2D communication with this new user selective resource allocation.