5G(NR)中的N1接口及功能 - MSCBSC 移动通信论坛

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5G(NR)中的N1接口及功能

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发表于 2020-07-28 09:33:48 只看楼主

在移动通信网络中，终端通过无线网络接入核心网后再进行通信；期间终端与核心网间的链路对终端的接入、移动及业务有着决定性的作用；而这些链路大多都是逻辑链路；在5G(NR)网络中承载UE与AMF之间信令传递的就是N1接口（链路）；整理：kangguoying20200728

1.N1接口是什么？

根据3GPP 23.501图4.2.4-4，N1接口就是UE与AMF之间的接口；主要用于传递NAS层信令；整理：kangguoying20200728

在3GPP 23.501-4.2.8.2和23.501-5.3.3.1，N1代表了UE—（无线）接入网—（无线）接入网—AMF之间接口的组合；（无线）接入网可基于3GPP，亦可非3GPP；NAS信令通过N1接口传输；整理：kangguoying20200728

2.N1接口传递消息

根据3GPP 24.501 - 4.3.3.1, 4.3.4.1 and 4.9. I 在N1接口上UE与核心网单元（AMF）之间传递的内容有三类：

SMS.整理：kangguoying20200728
UE Policy.整理：kangguoying20200728
LCS.整理：kangguoying20200728

终端与核心网之间交互的内容见下表：整理：kangguoying20200728

UE Usage Setting	Network Capability	Registration Status	N1 mode status
Power Cycle (Off --> On)			Re-enable the N1 mode
USIM Removal			Re-enable the N1 mode
Disable ->Timer Expiration(*1)			Re-enable the N1 mode
From "data centric" to "voice centric"	"IMS voice not available" over 3GPP access only	the UE is only registered over 3GPP access	Disable the N1 mode capability for 3GPP access
From "data centric" to "voice centric"	"IMS voice not available" over both 3GPP access and non-3GPP access	the UE is registered over both 3GPP access and non-3GPP access	Disable the N1 mode capability for 3GPP access and non-3GPP access
From "data centric" to "voice centric"	"IMS voice not available" over both 3GPP access and non-3GPP access	the UE is registered over 3GPP access only	Disable the N1 mode capability for 3GPP access
From "data centric" to "voice centric"	"IMS voice not available" over both 3GPP access and non-3GPP access	the UE is registered over non-3GPP access only.	Disable the N1 mode capability for non-3GPP access
From "voice centric" to "data centric"	N1 mode capability for 3GPP access is disabled at the UE (due to IMS voice unavailability)		Re-enable the N1 mode capability for 3GPP access
From "data centric" to "voice centric"	"IMS voice not available" over non-3GPP access only	the UE is only registered over non-3GPP access	Disable the N1 mode capability for non-3GPP access
From "voice centric" to "data centric"	N1 mode capability for non 3GPP access is disabled at the UE (due to IMS voice unavailability)		Re-enable the N1 mode capability for non-3GPP access
"voice centric"	"IMS voice not available" over 3GPP access only	the UE is only registered over 3GPP access	Disable the N1 mode capability for 3GPP access
"voice centric"	"IMS voice not available" over non-3GPP access only		Disable the N1 mode capability for non-3GPP access
"voice centric"	"IMS voice not available" over both 3GPP access and non-3GPP access	UE is registered over both 3GPP access and non-3GPP access.	Disable the N1 mode capability for 3GPP access and non-3GPP access
"voice centric"	"IMS voice not available" over both 3GPP access and non-3GPP access	UE is registered over 3GPP access only	Disable the N1 mode capability for 3GPP access
"voice centric"	"IMS voice not available" over both 3GPP access and non-3GPP access	UE is registered over non-3GPP access only.	Disable the N1 mode capability for non-3GPP access

原文来自：http://www.sharetechnote.com/ 整理：kangguoying20200728

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