EPC用户面结合软件定义网络技术的研究与设计

发布时间：2018-06-21 05:27

本文选题：软件定义网络 + 移动网络　；参考：《北京邮电大学》2014年硕士论文

【摘要】：传统网络将控制逻辑和数据转发紧密结合于网络设备上,从而导致网络规模日渐臃肿,使得控制平面管理日益复杂。将传统网络设备中的控制功能剥离出来,放置到网络中更高的层面,原先的网络设备由于没有了控制决策的功能,退化为单纯的转发元件,网络脉络变得更加清晰。同时,被剥离出来的网络控制功能形成一个大的“控制器”,通过对控制器进行转发规则的定义来控制网络中数据的流向。由于不同的网络使用者需求不同,可以在控制器之上进行软件的编写,达到差异化定制的效果,满足不同的需求。这种“软件定义--集中控制--单纯转发”的思想被命名为软件定义网络,即software-defined network. 与2G/2.5G网络中的GPRS架构相比,EPC架构呈扁平化发展,控制平面和用户平面趋于分离,其中用户平面网元主要由S-GW和P-GW组成,S-GW将SGSN中与移动性管理相关的控制功能剥离出来,只用于承载用户数据；P-GW类似于GPRS中的GGSN功能,是核心网系统和外部数据网络连接的网关,主要负责路由选择与转发功能,其功能类似于传统因特网中的路由器。 Openflow是软件定义网络发展过程中比较重要的一个协议,它定义了转发数据包的格式、数据结构及一些对数据流的操作,目前市面上已有支持0penflow协议1.0和1.3版本的交换机。本文从SAE架构的EPC部分出发,结合SDN中集中控制--转发分离的基本思想,拟运用SDN的关键技术及协议,并试图将EPC中用户面(包括Serving GW和PDN GW,服务网关和分组数据网关)的控制与转发流程与SDN的思想相结合,并提出一种结合了软件定义网络的EPC用户面网络架构原型。
[Abstract]:In the traditional network equipment , the control logic and the data forwarding are tightly combined on the network equipment , thereby causing the network scale to become increasingly complex .

Compared with the GPRS architecture in the 2G / 2.5G network , the EPC architecture is flat , the control plane and the user plane tend to be separated , wherein the user plane network element is mainly composed of the S - GW and the P - GW , and the S - GW separates the control function related to the mobility management in the SGSN , and is only used for carrying user data ;
The P - GW is similar to GGSN function in GPRS , which is the gateway of core network system and external data network connection . It is mainly responsible for routing and forwarding function , and its function is similar to router in traditional Internet .

Openflow is an important protocol in the development of software - defined networks . It defines the format , data structure and some operations on the data stream . Currently , there are more than 1.0 and 1.3 versions of switches on the market .

Starting from the EPC part of the SAE architecture , this paper combines the basic idea of centralized control - forwarding separation in the network , proposes the key technologies and protocols of the SDNs , and attempts to combine the control of the user plane ( including the serving GW and the PDN GW , the service gateway and the packet data gateway ) in the EPC and the thought of the network , and proposes a prototype of the EPC user plane network architecture combining the software defined network .
【学位授予单位】：北京邮电大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：TP393.05

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