软件定义内容网络中的联合拥塞控制策略

Joint Congestion Control Strategy in Software Defined Content Network

内容中心网络(CCN)从网络体系结构角度解决内容获取与分发问题,但网络资源的有限性和流量的突发性导致网络拥塞不可避免。当前主流的CCN实现仍需依赖IP路由,这样拥塞控制方案只能叠加在IP拥塞控制之上,无法体现研究价值。考虑到协议无感知转发(POF)协议是对Open Flow协议的扩展,支持任意格式的转发数据包,基于POF环境实现不依赖于IP路由的CCN原型——软件定义内容网络(SDCN),并以此为基础提出一种联合拥塞控制策略。实验结果证明该策略可以有效实现软件定义内容网络的拥塞控制。

Content-centric Network （CCN） provides a solution to solve the problem of content acquisition and distribution in the view of network architecture. The finiteness of network resource and unexpectedness of network traffic result in network congestion inevitably. The mainstream implementation of CCN still relies on IP routing, so the study of congestion control scheme in CCN now cannot reflect the value of the research which can only superimpose over the congestion control scheme of IP. Protocol-oblivious Forwarding（POF） is an extension of the OpenFlow protocol, which can support to forward packets in any format. In view of this feature, this paper realizes a prototype of CCN based on POF, named Software Defined Content Network（SDCN）. Then a joint congestion control strategy is proposed in SDCN. Experimental results show that this strategy can effectively control congestion in SDCN.