SDN驱动的云演进分组核心网：低信号负载与高度灵活性

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本文主要探讨了基于软件定义网络（Software-defined Networking, SDN）/OpenFlow技术的云演进分组核心网（CloudEvolved Packet Core, CEPC）架构。该创新设计旨在将服务网关（ Serving Gateway, S-GW）和公共数据网关（Public Data Network Gateway, P-GW）的控制平面与数据平面完全分离，并将移动管理实体（Mobility Management Entity, MME）、S-GW-C和P-GW-C在LTE演进分组核心（Long-Term Evolution Evolved Packet Core, LTE/EPC）架构中的控制功能迁移至云端控制器。研究者张耀云、徐展和田志刚通过模拟CEPC架构下的初始接入过程以及传统LTE/EPC架构，发现云化CEPC架构在信号加载（paging signaling load）上表现更优，网络灵活性和可编程性也显著提高。首先，引入部分指出，随着现代移动网络服务的扩展和互联网应用的日益增长，传统的LTE/EPC架构已经无法满足日益增长的需求。SDN作为一种新兴的网络设计理念，其优势在于通过集中控制和开放接口，实现网络资源的灵活管理和自动化配置，从而提升网络效率和可扩展性。在CEPC架构中，关键创新包括： 1. **控制平面与数据平面分离**：传统的网络设备被解耦为独立的部分，控制层面集中在云控制器，处理策略和规则，而数据转发则由硬件执行，这有助于减少网络瓶颈，提高资源利用率。 2. **云计算支持**：MME、S-GW-C和P-GW-C的控制功能迁移到云端，实现了资源池化和弹性伸缩，降低了硬件成本和运维复杂度。 3. **信号加载优化**：通过模拟实验，云化CEPC架构在初始附着过程中显示出较低的信号负载，表明其在流量管理和用户连接建立方面的效率更高。 4. **灵活性与可编程性增强**：SDN和OpenFlow技术的应用使得网络可以根据业务需求快速调整，提供了更高的定制性和创新能力，这对于支持未来5G和物联网等新型业务场景至关重要。基于SDN的云演进分组核心网架构是网络演进的重要里程碑，它不仅提高了网络性能，还为未来的网络设计和运营提供了强大的平台。随着技术的深入发展，这种架构有望进一步推动电信行业的数字化转型和创新。

Cloud Evolved Packet Core Network Architecture Based on

SDN

Zhang Yaoyun

1, a

, Xu Zhan

1, b

and Tian Zhigang

2, c

Beijing Information Science & Technology University, Beijing, 100192, China.

Tsinghua University, Beijing, 100084, China.

zhangyaoyun111@126.com,

xuzhan@bistu.edu.cn,

zgtian@tsinghua.edu.cn

Keywords

:SDN , Openflow , CEPC , Signaling load

Abstract.This paper proposes a Cloud Evolved Packet Core (CEPC) architecture

based on software-defined networking (SDN) / Openflow technology, which separates

the control plane and data plane of a serving gateway (SGW) and a PDN gateway

(PGW) completely, and runs the control functions of a mobility management entity

(MME), SGW-C and PGW-C of the LTE-evolved packet core (LTE/EPC)

architecture in the cloud controller. By simulating the initial attach process of the

CEPC architecture and the traditional LTE / EPC architecture, it is concluded that the

CEPC architecture has a lower paging signaling load, and the network flexibility and

programmability are higher.

1.Introduction

With the expansion of modern mobile network services and the expansion of the

scale of Internet applications, the operation and management of network complexity

increases, the cost becomes high. It presents a huge challenge to the current mobile

network architecture. The 3GPP LTE/EPC and LTE-A

[1]

standards were released to

cope with the increased demand for high-speed mobile networks. However, LTE /

EPC architecture still faces some problems, such as the data plane at the SGW and the

PGW is still tightly coupled with the control plane.

In this paper, based on the LTE/EPC architecture, the use of SDN/Openflow

technology

[2]

to redesign the architecture, that is, the CEPC system architecture. The

architecture is flexible and programmable by completely separating the control plane

and the data plane. By comparing the initial attach process of traditional LTE / EPC

architecture and CEPC architecture ,the signaling load of the process

[3]

as an

evaluation metric, the CEPC architecture is superior to the traditional architecture in

the case of different number of users.

2.Background and Related Work

2.1 3GPP LTE / EPC architecture:

3GPP LTE / EPC

[4]

architecture is mainly responsible for the overall control of

the user terminal and the establishment of the relevant bearer. The EPC architecture is

mainly composed of MME, SGW, PGW and the Home Subscriber Server (HSS),as

shown in Fig.1. The user sends data packets through the eNB and SGW to the PGW.

The MME is a control node that handles signaling interactions between the UE and

the core network. SGW and PGW are responsible for data forwarding, IP address

assignment, and Quality of Service(QoS) assurance in the data plane.

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SDN驱动的云演进分组核心网：低信号负载与高度灵活性

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