Blockchain-Based Trustworthy Satellite Load Balancing Routing Strategy for Smart Grid CPS

Advanced communication network technology is essential for real-time and reliable transmission of Smart Grid Cyber-Physical Systems (CPS) data to ensure the dependable operation of Smart Grid CPS. Combining satellite communication networks with Smart Grid CPS can effectively solve transmission congestion problems and high transmission delays. Low Earth Orbit (LEO) satellites are the primary research object in satellite communication due to their low cost, low transmission delay, and low propagation loss. However, the open space network environment where satellites operate makes it easy for illegal nodes to join the network and threaten effective operation. Rapidly changing network topology in LEO satellites makes it challenging for nodes to establish trust relationships, and traffic distribution in the network is uneven, making quality of service difficult to guarantee. We propose a blockchain based trustworthy load-balancing routing strategy for LEO satellites, introducing identity authentication technology based on blockchain to improve network security. We propose a multi-path transmission load balancing strategy based on deep reinforcement learning for intelligent routing decisions through a round-robin scheme. Experimental simulations show that our proposed strategy significantly improves the performance of average maximum link utilization, cumulative waiting delay, and total business transmission delay compared to the baseline strategy.