下一代网中的联合流量工程研究

A unified traffic engineering scheme in the next generation network

为克服当前流量工程的不足,依据下一代网的特点及其服务质量保证,基于自行设计的约束路由算法和标签交换路径抢占机制,提出一种适合于下一代网的流量工程机制.该机制联合了在线路由和离线路由机制,综合考虑多层网络的选路和资源配置,利用抢占机制,并通过资源调度模块完成带宽的弹性分配,以实现网络资源利用率的全局最优化.该机制不仅可对流量的变化做出及时反应,且可为不同等级业务提供不同的服务质量.

On the basis of the characteristics and quality-of -service （0oS） guarantee of the next generation network （NGN） , and overcoming the drawbacks of the present traffic engineering technology, we propose a unified traffic engineering mechanism suitable for NGN, which is based on the self-designed constrained routing algorithm and the Label Switched Path （LSP） preemption scheme. To make the global optimization of network resources possible, not only are offline-and online-routing methods used, but also the multilayer network path selection and the resource provisioning are integrally adopted. Moreover, the preemption mechanism and the resource-scheduling module are utilized to realize the flexible allocation of bandwidth. The main advantages of the proposed solution are the prompt reaction to the traffic changes and the provision of different QoSs for different classes of traffic. This paper mainly stuides the principles of proposed mechanism and its key technologies, and presents the flow chart of the implementation system.