Distributed date storage based on fountain codes for space information network

Hierarchical autonomous system (AS) solves the problem of controlling the entire Space Information Network (SIN) for whose high component complexity and dynamic. Aiming at the problem that storage resource of AS network´s node severely limited, we propose an efficient Distributed Date Storage based on Fountain codes (DDSF) strategy. DDSF implements directional random walk mechanism for packet transmission, the ID-based estimation method is used to estimate the global information during the pre-coding phase, the process of XORing packets is reasonable so that the distribution of code degree tends to the ideal distribution. As presented by the analyses and simulations, random walk steps is greatly reduced compared with a representative RCDS strategy, while improving the decoding performance.