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A space-air-ground integrated network (SAGIN) provides comprehensive interconnection and quality of service. Such an integrated network poses security concerns by bringing together a variety of devices from different untrusted authorities. Blockchain, as a decentralized ledger, although showing great potential to solve the security issues in SAGIN, may bring up intolerable latency by sequentially validating requests and take up numerous storage resources by keeping a complete replica of the entire chain in every node in a large-scale network. It becomes a feasible solution to use multiple parallel blockchains to efficiently manage different segments of SAGIN and blockchain collaboration technology to enable necessary inter-segment cooperation. Toward this end, we propose a collaborative blockchain architecture for SAGIN to achieve secure and efficient management of diverse resources. Each segment of SAGIN (i.e., space, air, and ground network) maintains a specially designed block-chain while blockchain collaboration is enabled. We then design an incentive-based collaborative blockchain for space-air-ground mobility management to encourage the participation of different network segments and ensure the security of collaboration using relay chain technology. Numerical results show the effectiveness of the proposed framework.
Sun et al. (Tue,) studied this question.