DTN中基于服务等级的Push-Pull拥塞控制研究*

提出了一种基于服务等级的拥塞控制机制，通过为后续高优先级业务预留缓存资源的方法来减小容迟网络(DTN)中由于保管传输协议造成节点缓存资源的耗尽而引起的网络拥塞，从而改善服务质量。仿真结果表明，该拥塞控制方法在缓解网络拥塞的同时可以有效改善高优先级业务的传输性能，但其在一定程度上牺牲了低优先级业务的服务质量。

Congestion control mechanism of Push-Pull based on service level in DTN

This article proposed the congestion control mechanism, which reduced network congestion on account of the custody transfer protocol adopted was likely to result in the depletion of node cache resources, through the method of reserving the cache resources for the followed and high priority assignments to improve their service quality. The simulation results show that in one hand, the method of congestion control which introduced above is useful for relieving the network congestion and also effective in improving the transmission performance for the high-priority assignments on the other hand. However, it sacrifices the quality of low-priority service on the extent.