【摘要】 为了应对封闭、僵化、难以在传输速率和容量上做出突破的传统网络,研究者提出软件定义网络(Software-Defined Networking,SDN)的概念,SDN将控制功能从数据转发层中分离出来,使得终端接入、数据转发等功能统一由控制器控制,同时开放网络设备的可编程接口,提高了网络的灵活性和可控性。SDN与无线网络相结合,形成软件定义无线网络(Software-Defined Wireless Networking,SDWN)。本文主要综述了包括接口、协议、平面等软件定义无线网络相关的基本概念以及SDWN的基本体系结构(应用层、控制层以及基础设施层等);分析了SDWN实现过程中的关键问题如切换管理、负载均衡、协同管理等;从切换及虚拟技术、协议稳定性、可扩展性方面论述了相关技术所面临的挑战以及目前的研究工作重点;最后,从以上挑战出发,展望了SDWN未来的主要研究方向。更多还原

【Abstract】 In order to deal with the closed,rigid,slow and low-volume traditional network,researchers proposed the concept of software-defined networking( SDN) which can separate data forwarding plane and control plane,open programmable network interface,manage the terminal access and data forwarding through the controller,and improve network flexibility and controllability. Software-defined wireless networking( SDWN) applies the software-defined ideas to the wireless field. This paper summarizes the basic concepts includes interface,protocol,plane,and other basic structure( including the application layer,control layer and infrastructure layer) of SDWN; The paper analyzes some key problems in the implementation of SDWN such as switch management,load balancing,collaborative management. This paper also discusses some technical challenges and priorities from switching and virtual technology,protocol stability andscalability. And the possible research direction and emphasis with the above challenges are also prospected.更多还原