QoE-Driven Distributed Content Segments Sharing with Service Differentiation in D2D Network

Content sharing via device to device (D2D) communication is considered as a promising method to improve the performance of cellular network. However, in D2D networks, the placement of multimedia content is still an complex and urgent issue. Hence, it is significant to figure out a fine-grained content collaboration placement and delivery strategy in D2D networks. For the efficient utilization of the storage and downloading capacity of user devices, we introduce a distributed content segment sharing strategy. In order to improve QoE with limited network resource, such strategy provides users multimedia service with differentiated quality. Then, we formulate QoE-driven D2D content segment placement with service differentiation as a submodular maximization problem, and a polynomial time algorithm is proposed. Simulation results shows that proposed algorithm outperforms the algorithms without distributed content segments sharing mechanism in terms of QoE. It also demonstrates that proposed algorithm has better on the performance of cache content diversity and fairness.