面向5G的核心网演进规划

doi:10.11959/j.issn.1000-0801.2018210

Abstract

Abstract:

Firstly,the 5G standard and industrial progress were summarized,and the 5G core network architecture,key technologies and interworking architecture were combed.On this basis,the idea of phased evolution planning and deployment suggestions for the 5G core network were proposed to provide reference for the introduction of the 5G core network in the present network.

Key words: 5G core network, 5GC, EPC, evolution, option

Xu YANG,Ziyu XIAO,Yongping SHAO,Xiaoming SONG. Core network evolution planning oriented 5G[J]. Telecommunications Science, 2018, 34(7): 162-170.

Figures/Tables 15

References 8

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5G网络功能	中文名称	类比EPC网元
AMF	接入和移动性管理功能	MME中NAS接入控制功能
SMF	会话管理功能	MME、SGW-C、PGW-C的会话管理功能
UPF	用户平面功能	SGW-U+PGW-U用户平面功能
UDM	统一数据管理	HSS、SPR等
PCF	策略控制功能	PCRF
AUSF	认证服务器功能	HSS中鉴权功能
NEF	网络能力开放	SCEF
NSSF	网络切片选择功能	5G新增，用于网络切片选择
NRF	网络注册功能	5G新增，类似增强DNS功能

EPC网元	升级改造范围分析	建议
MME	全部升级：不需要支持DECOR功能，RAN维持现网的MME/SGSN选择方式不变；MME pool内设备负载均衡	业务开通范围内，以pool为单位全部升级
	部分升级：需要RAN和MME/SGSN、HSS支持DECOR为5G使能的UE选择具备NSA能力的MME，或者eNB定制升级根据UE能力选择MME（方案非标，不建议）；MME pool内设备负载不均衡
SAE-GW	SAE-GW可部分升级支持NSA，MME和DNS根据UE-NR-capability为5G使能的UE选择NSA GW	按需部分升级
PCRF	PCRF只需配置新的5G带宽参数，PCRF需要全网配置，DRA维持现网的PCRF选择方式不变	业务开通范围内全部升级
HSS	为实现统一的数据管理，需要全部升级	业务开通范围内全部升级
CG	与SAE-GW方案保持一致，可以部分升级	按需部分升级

建议	方案一：云化新建（全部替换）方案	方案二：现网平滑过渡方案
方案概述	云化新建全量的 UDM/HSS、PCF/PCRF、UDR，替换现网HSS、PCRF，一次性割接入网	需要BOSS和DRA配合（或厂商私有方案），实现新增5G用户在HSS、PCRF和UDM、PCF的逐步迁移
优势	? 目标方案，一次性建设到位；y 支持服务化接口，不涉及现网厂商绑定	? 保护现有设备投资；初期投资和云化资源需求少；y 网络割接风险相对较小
劣势	? 一次性投资大，云化资源需求大；y 割接风险较大	? 涉及厂商私有方案，现网厂商绑定；y 网络调整时间最长，日常维护复杂

分析维度	独立部署	融合部署
5G语音绑定业务	AF需识别用户所在网络将消息路由到不同信令设备；或DRA需要识别并中转5G用户消息给HTTP proxy	可以共享绑定数据
设备利用率	低，4G用户会逐步向5G迁移	高，共享会话绑定数据及路由数据
日常运维	需要维护两套数据	可以维护一套数据

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Core network evolution planning oriented 5G

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