3GPP TS 23502-h20 中英文对照 | 4.4.1.2 N4 Session Establishment procedure

Posted 2022-01-02 COCOgsta

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4.4.1.2 N4 Session Establishment procedure

The N4 Session Establishment procedure is used to create the initial N4 session context for a PDU Session at the UPF. The SMF assigns a new N4 Session ID and provides it to the UPF. The N4 Session ID is stored by both entities and used to identify the N4 session context during their interaction. The SMF also stores the relation between the N4 Session ID and PDU Session for a UE.

N4 Session Establishment过程用于为UPF上的PDU Session创建初始N4会话上下文。SMF分配新的N4 Session ID并将其提供给UPF。N4 Session ID由两个实体存储，用于在交互期间标识N4会话上下文。SMF还存储UE的N4 Session ID和PDU Session之间的关系。

Figure 4.4.1.2-1 N4 Session Establishment procedure

1. SMF receives the trigger to establish a new PDU Session or change the UPF for an established PDU Session.

1.SMF接收建立新PDU Session或更改已建立PDU Session的UPF的触发器。

2. The SMF sends an N4 session establishment request message to the UPF that contains the structured control information which defines how the UPF needs to behave.

2.SMF向UPF发送N4会话建立请求消息，该消息包含结构化控制信息，该信息定义了UPF的行为方式。

3. The UPF responds with an N4 session establishment response message containing any information that the UPF has to provide to the SMF in response to the control information received.

3.UPF响应N4会话建立响应消息，该消息包含UPF必须向SMF提供的任何信息，以响应接收到的控制信息。

If the UPF (by configuration or other means) utilizes an NWDAF, UPF adds the NWDAF serving the UE identified by the NWDAF instance ID. Per NWDAF service instance the Analytics ID(s) are also included.

如果UPF（通过配置或其他方式）使用NWDAF，UPF将添加NWDAF，该NWDAF为NWDAF实例ID标识的UE提供服务。每个NWDAF服务实例还包括Analytics ID。

NOTE: The SMF can use this NWDAF related information and can forward it to the PCF using the SMF initiated SM Policy Modification procedure, as a result of a Policy Control Request Trigger.

注意：SMF可以使用此NWDAF相关信息，并可以使用SMF发起的SM Policy Modification过程将其转发给PCF，作为Policy Control Request Trigger的结果。

4. The SMF interacts with the network function which triggered this procedure (e.g. AMF or PCF).

4.SMF与触发该程序的网络功能（如AMF或PCF）交互。