QoS路由网络中的准人控制研究

作为下一代具有服务质量（QoS）控制功能的互联网核心机制之一，准入控制在提供合理的网络资源分配方式的同时，需要具有很好的可扩展性。本文结合互联网无连接、无资源预留的本质，尝试了在一定概率下保证被准入控制接受的业务流的服务质量，设计了一种支持多种QoS约束的端到端准入控制机制。该机制以无连接的逐跳QoS路由为基础，将整个互联网划分成核心网络和边缘网络两层。核心网络仅维护其本身的QoS信息并使用QoS路由，而不保存每流状态；准入控制则通过端到端路径上的所有节点配合处于边缘网络的源网关完成，并由源网关完成流的统计和检测功能。因此，这种准入控制机制具有良好的可扩展性。

Admission Control in QoS Routing Network

As one of the most important mechanisms in the next-generation networks with QoS support, admission control that allots the network resources should be scalable and efficient. Integrating the nature of the connectionless Internet with no resource reservation, we propose a novel multi-constrained end-to-end admission control that provides statistical QoS guarantees. Based on hop-by-hop QoS routing, the Internet is divided into core and edge networks. The core only maintains its own QoS information without saving per-flow state. Admission control is performed on the ingress router coordinating with all of the routers along the end-to-end path. Therefore, our admission control mechanism has a good scalability and practicability.