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网络中针对拥塞一般采用源端控制机制,源端控制能根据网络反馈的参数调整发送速率,缓解网络拥塞,但对于网络环境复杂的卫星网络环境,仅仅依靠端节点进行拥塞控制难以达到理想效果。网络中越来越多的服务质量(QoS)要求也需要网络的中间节点参与网络层的拥塞控制。该文提出一种卫星网络上的拥塞控制机制,其核心思想是利用动态分流缓存的中间节点丢包率管理策略进行控制。策略重点关注丢包率这个联系拥塞控制策略与服务质量控制策略的关键参数,通过丢包率的情况掌握网络的拥塞程度,作出拥塞控制决策。仿真结果表明:该机制拥有比传统中间节点控制机制更好的吞吐率表现。
In the network, the source end control mechanism is generally adopted for congestion. The source end control can adjust the sending rate according to the parameters fed back by the network to alleviate the network congestion. However, for the network environment with complicated network environment, it is difficult to achieve the desired effect by merely relying on the end node for congestion control. More and more Quality of Service (QoS) requirements in the network also require intermediate nodes in the network to participate in network layer congestion control. This paper presents a congestion control mechanism on a satellite network. The core idea is to control the packet loss rate using the intermediate node of dynamic offloading caching strategy. The strategy focuses on packet loss rate, which is the key parameter of congestion control strategy and quality of service control strategy. It grasps the congestion degree of the network through the packet loss rate to make the congestion control decision. Simulation results show that this mechanism has better throughput performance than the traditional intermediate node control mechanism.