关键词: DTN, 传染路由, 拥塞控制, 动态存储

Abstract: Aiming at the problem of dynamic topology changes and limited node storage space in Delay Tolerant Network (DTN), a DTN epidemic routing method with congestion control strategy（ERC2）was proposed. The method was based on a dynamic storage state model. The node dynamically adjusted the threshold of the node's semi-congested state by sensing network conditions to reduce the possibility of network congestion. Increasing the ACK index and message management queue made the node storage state change randomly with the network load, so that redundant packages were dynamically updated and deleted actively. According to the advantages of different congestion states combined with contagious routes and probabilistic routes, single or mixed mode message forwarding can be selected. ERC2 achieved the purpose of preventing, avoiding, and relieving congestion, and implemented adaptive cache management of nodes and dynamic congestion control of the network. Simulation results show that ERC2 has better network performance than Epidemic and Prophet routing algorithms in scenarios with different levels of congestion.

Key words: Delay Tolerant Network (DTN), epidemic routing, congestion control, dynamic storage