Coded Caching in Request-robust D2D Communication Networks

Device-to-device (D2D) coded caching is an effective way to reduce the peak-time delivery rate of both the server and the users. It consists of two phases, the placement phase and the delivery phase. Most prior works on D2D coded caching are based on the assumption that all users will request content at the beginning of the delivery phase. However, in practice, this often times is not true. Motivated by this consideration, this paper formulates a new problem called the request-robust D2D coded caching, where the identity of the users making file requests are known only at the beginning of the delivery phase. For this novel D2D coded caching problem, we propose an achievable scheme based on uncoded cache placement and exploiting common demands and one-shot delivery. We show that the proposed scheme outperforms known D2D coded caching schemes applied to the request-robust scenario.