5G网络架构的重构与挑战
2018-02-03李聪
李聪



【摘 要】首先详细阐述了面向5G网络架构的沿革与SDN/NFV的引入,并对现有网络采用解耦、抽象和重构的方法,提出了控制与转发分离、控制集中化、可编程的移动通信网络架构,最后分析阐述了水平网络及开放性的新含义,网络重构的趋势、战略目标、演进方向和目标架构,以及网络架构重构的战略意义和挑战。
【关键词】网络架构;网络重构;网络演进
On the Reconfiguration and Challenge of 5G Network Architecture
LI Cong
(Shanghai Posts & Telecommunications Designing Consulting Institute Co., Ltd., Shanghai 200092, China)
[Abstract] The evolution oriented to 5G network architecture and the introduction of SDN/NFV were elaborated. The decoupling, abstracting and the reconfiguration were applied to existing networks to propose the mobile communication network architecture with the separation of control and forwarding, centralized control and the programing ability. The new concepts of the horizontal network and the opening were expounded. The tendency, strategic goal, evolution direction and target architecture were addressed. Finally, the strategic significance and challenge of network architecture reconfiguration were discussed.
[Key words]network architecture; network reconfiguration; network evolution
1 引言
5G(5th Generation,第五代移动通信系统)是一个端到端的生态通信系统,它将实现一个全连接和全移动的社会。现有的传统网络是刚性固化的,传统网络往往更加关注网络的底层传送能力而忽略了网络的能力向上层应用和业务开放,因此导致网络缺少流程化的能力开放接口,业务很难灵活地调用网络能力,这就导致承载网不能承载一些互联网的业务和应用,而必须采用应用层专用的协议进行纠错、应用加速和流量均衡等优化设计。
此外,现有2G/3G/4G网络更多地关注和加强技术从而局限在接入网及核心网上,而5G将会改变以往通信网络格局,实现网络的软件和硬件的分离。5G架构的重构通过引入了NFV(Network Function Virtualization,网络功能虚拟化)和SDN(Software Defined Network,軟件定义网络),将淘汰传统网络建设复杂度非常高的“烟囱”架构,以充分展示基于SDN/NFV技术的创新型基础设施环境在灵活组网和网络安全方面的潜力[1]。为此,本文接下来将详细阐述面向5G网络架构的沿革与SDN/NFV的引入,并探讨5G网络架构的重构及面临的挑战。
2 网络重构及SDN/NFV的引入
2.1 网络重构……
