Cache-enabled D2D Communication: A Social Perspective

Caching the popular multimedia contents at the wireless edge such as mobile devices, has been identified as a key technology to unleash the ultimate potential of wireless networks. In addition to the physical link condition, social relationships are also of great importance for effectiveness enhancement of the D2D-based wireless caching network. In this paper, we analyze theoretically the performances of the cache-enabled D2D underlaid cellular network with the heterogeneous caching placement, while taking the role of social interaction into account. In this scenario, we firstly derive the achievable average ergodic rate that satisfies a successful content delivery by utilizing the social interaction statistics along with channel statistics with the aid of stochastic geometry. Then the successful transmission probability under the constraint of social interaction is further derived. Based on the expression, we reveal the impact of physical layer and content-related parameters on the network performance. Simulation results validate the accuracy of theoretical analysis and provide the condition when the network performance can benefit from D2D caching.