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Nowadays, researchers increasingly pay more attention to wireless caching techniques for terminals based on the device- to-device (D2D) technology. Through data pre-caching and D2D communication, network congestion and transmission delay can be largely reduced, which effectively improves the spectrum efficiency and energy efficiency of the system. However, considering the selfishness of the user equipment (UE), it may not always volunteer to cache data traffic for serving other UEs. Therefore, it is of particular importance to design an incentive mechanism suitable for D2D wireless caching networks, in order to encourage a UE to participate in collaborative caching and data transmission for other UEs. In this paper, we propose a cache communication incentive mechanism (CCIM) that considers both the content helper (CH) selection and the collaborative cache content placement procedures to maximize the network utility. Specifically, we design a preference and distance based caching (PDC) algorithm to solve the optimization problem formulated. Simulation results show that the proposed solution can obtain significant performance gains over existing caching algorithms. |
