Mobility aware caching incentive scheme for D2D cellular networks
Danyang Wang, Hailing Li, Shuo Wang, Juwo Yang, Xinwei Liu, Xi Zhang · 2017
Device-to-device (D2D) caching network is proposed to cope with the explosively growing traffic of next-generation mobile networks. Given the limited mobile users' (MU) caching capacity, it is significant to decide which contents and how much proportion of each content should be cached. Based on the selfish nature and varied content preference of MUs, we propose a mobility aware caching incentive scheme, in which base stations (BS) reward MUs for sharing contents with others through D2D communication. By solving the problem of maximizing MU utility and minimizing BS cost at the same time, we obtain each MU's caching strategy and optimal unit reward provided by BS with adapted gradient projection algorithm. Comparisons are deliberated with several baseline caching schemes without incentive, in order to measure the performance of the proposed scheme. Simulation results show that under our settings, BS serving cost can be reduced by up to 45.6% when the optimal reward is selected compared with the fair caching scheme, the advantage is more obvious when MUs' mobility speed gets higher. Furthermore, the proposed scheme outperforms greedy caching, fair caching and random caching scheme in terms of MU utility under different distributions of content popularity.