A Caching Strategy Based on Spreading Influence in Information-Centric Satellite Networks.

Low-Earth-Orbit (LEO) satellite networks can transmit data globally, but their time-varying nature makes data transmission delayed and inefficient. An important feature of ICN (Information-Centric Network) is in-network caching, which is helpful to increase transmission efficiency. To reduce the time-varying effect on data transmission and to improve transmission efficiency among satellites, this paper introduces ICN into LEO satellite networks and proposes a Caching Strategy based on Spreading Influence (CSSI) for satellite networks. Our strategy portrays satellite nodes and popular contents in terms of spreading influence, and caches popular contents with dynamic probability in satellite nodes with high global spreading influence in the period to obtain a better caching effect. Compared with LCE, LCD, Prob, and Betw strategies, the CSSI effectively improves the cache hit ratio and reduces the average content request delay.