112 / 2016-06-16 16:29:38

A Novel Hybrid Distributed Storage Strategy for Space Information Network

10470,10471,10472,10473

Hierarchical autonomous system (AS) network
model makes the control of the entire Space Information Network
(SIN) easier. In this paper, we investigate the distributed data storage
problem in the SIN, a novel hybrid distributed storage (HDS)
strategy is proposed to improve the data reliability based on the
AS network model. After a data object is optimal encoded using
maximum distance separable (MDS) codes, the storage process
is divided into two phases: the inter-AS storage phase and intra-
AS storage phase, respectively. The inter-AS storage is modeled
as an optimal storage allocation problem for a heterogeneous
network under multiple constraints, where different AS networks
have different capacities and availabilities. Then, we deduce the
distributed storage within each AS network to a data persistence
problem. As a result, the data object is disseminated over the SIN
and it can be recovered by collecting a few encoded packets. The
proposed strategy utilizes the advantage of AS network model
of SIN, while aiming to improve data reliability and energy
efficiency.