Energy and delay efficient cooperative media content download

The advent of smartphones has brought about a new change in the traffic pattern of mobile users, for instance, there is a growing demand for high quality media content. In this paper, we consider a group of users within proximity of each other, who are interested in downloading the same content. Instead of the conventional cellular method of downloading the same content independently from the base station (BS), the group of users can exploit cooperative downlink strategies in a framework that involves both cellular and short-range communications. A few of such two-stage cooperative downlink strategies are studied in this paper. The results show that a significant energy saving of approximately 60% and a maximum possible delay reduction of 57% on an average, can be achieved by the proposed cooperative strategies.