Belief Propagation Based Distributed Content Delivery Scheme in Caching-Enabled D2D Networks
Jianbin Chuan, Li Wang, Jiajia Wu · 2019
Content delivery in wireless caching networks via device-to-device (D2D) communications can effectively offload the traffic burden and reduce the delivery delay and the energy consumption. This paper develops a distributed content delivery scheme to leverage D2D communications for content sharing by using belief propagation (BP) approach. With the target of minimizing average energy consumption for content delivery, the optimization of content delivery is formulated as a fractional programming which is NP-hard. By jointly considering channel conditions, cache status, and asynchronous demands, a distributed energy-balancing algorithm based on BP framework is proposed to facilitate the content requesters (CRs) to select the best content helpers (CHs). Furthermore, an implementation method is designed to motivate the practical deployment of the distributed scheme in caching-enabled D2D networks.