空间延迟/中断容忍网络拥塞控制策略研究

针对空间延迟/中断容忍网络（DTN, delay/disruption tolerant network）的拥塞控制问题，提出一种基于提前卸载的拥塞控制策略（EOCC，early offloading-based congestion control）。由于空间DTN网络大时延和不能保证时刻存在端到端路径的特点，EOCC主要利用网络节点的本地信息在拥塞发生前就采取措施。具体地，EOCC会时刻监测节点缓存变化速率，在即将发生拥塞时，将消息通过早于最优路径的非最优路径传输，从而缓解节点存储压力。仿真结果表明，采用EOCC的接触图路由获得了更好的性能。

On congestion control strategy for space delay/disruption tolerant networks

To address the congestion control problem in space DTN (delay/disruption tolerant networks), an EOCC (early offloading-based congestion control) strategy was proposed. As space DTN was often subject to high latency and end-to-end continuous connectivity could not be guaranteed, EOCC takes measures before congestion occurs with local information only. More specifically, EOCC will monitor the buffer rate at all times and attempts to relieve the storage pressure by early offloading the node buffer through non-best paths which are earlier than the best path when the network is about to congest. Simulation results show that contact graph routing with the proposed congestion control strategy achieves better performance.