5G核心网部署及演进方案

doi:10.11959/j.issn.1000-0801.2020268

Abstract

Abstract:

Firstly,the disadvantages of NSA networking based on the 5G commercial situation of domestic operators were analyzed,it was suggested to control NSA investment and carry out 5G network construction with SA as the goal.Then based on combing the progress of 5G core network standard and the main changes of R16 standard,the commercial deployment of 5G SA core network based on regional network cloud and the following 2G/4G/5G convergence evolution planning and deployment proposal was analyzed,it included the commercial deployment suggestions of 5G edge computing nodes and the subsequent planning and construction suggestions.It was suggested that the planning and construction of 2G/4G/5G integrated networking should be carried out as soon as possible,in order to effectively protect investment,reduce the complexity of networking and maintenance,realize the target architecture of full cloud deployment of control plane and distributed sinking deployment of user plane.It provides reference for the construction of 5G SA core network.

Key words: 5G core network, SA, integrated networking, evolution

CLC Number:

TN929.5

Xu YANG,Ziyu XIAO,Bing LIANG,Le LI. 5G core network deployment and evolution scheme[J]. Telecommunications Science, 2020, 36(9): 131-140.

网元类型	5G SA网元	提供的网络功能	EPC对应网元	组网部署
控制层	AMF	AMF	MME	覆盖区域连续的
	SMF	SMF	SAEGW-C	大本地网组pool
		BSF	5G特有
	NSSF	NSSF	5G特有	大区、多切片共用
信令层	NRF	NRF	5G特有
应用层	SMSF	SMSF	5G特有
数据层	UMD/UDR	AUSF	HSS/HLR	省份，按号段
		UDM
		UDR
	PCF/UDR	UDR	PCRF/SPR
		PCF
媒体转发层	UPF	UPF	SAEGW-U	本地网组pool

方案比较	方案一：新建替换	方案二：同厂商混合组网	方案三：IWF方案
业务能力	好，支持SA所有功能与业务		一般，对灵活切片等5G特色功能支持差
运营开通	好，可支持自动开通和默认开通	较好，仅支持自动开通	一般，仅支持全量默认开通
厂商支持情况	好，国际标准，各厂商设备均计划支持	好，各厂商设备均计划支持	一般，产品正在研发，成熟度有待验证
支持现网用户不换号使用SA的进度	最慢，全量用户数据搬迁、信令链路割接、用户开通调整，周期较长、进度慢	较快，通过同厂商内部接口混合组网支持用户使用SA，进度较快	最快，无须用户迁移，支持SA进度最快
安全风险	相对较高，对已迁移用户2G/4G/5G业务均有影响	较低，对5G用户的业务有影响	最低，5G SA故障不影响用户现有业务
网络演进	目标方案，一步到位	时间较长，5G用户逐渐增长，实现全融合及虚拟化、集中化，需要较长时间	过渡方案，为实现用户数据虚拟化、集中化，后续仍需对现网设备进行替换
投资	一次性投资高	初期投资较小	初期投资最小

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5G core network deployment and evolution scheme

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