3GPP TS 23502-h20 中英文对照 | 4.4.1.3 N4 Session Modification procedure

Posted 2022-01-02 COCOgsta

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4.4.1.3 N4 Session Modification procedure

The N4 Session Modification procedure is used to update the N4 session context of an existing PDU Session at the UPF, which is executed between SMF and UPF whenever PDU Session related parameters have to be modified.

N4 Session Modification过程用于更新UPF上现有PDU Session的N4会话上下文，每当必须修改PDU Session相关参数，就会在SMF和UPF之间执行该过程。

 Figure 4.4.1.3-1 N4 Session Modification procedure

1. SMF receives the trigger to modify the existing PDU Session.

1.SMF接收修改现有PDU Session的触发器。

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

2.SMF向UPF发送N4会话修改请求消息，该消息包含结构化控制信息的更新，该信息定义了UPF的行为方式。

3. The UPF identifies the N4 session context to be modified by the N4 Session ID. Then, the UPF updates the parameters of this N4 session context according to the list of parameters sent by the SMF. The UPF responds with an N4 session modification response message containing any information that the UPF has to provide to the SMF in response to the control information received.

3.UPF识别要由N4 Session ID修改的N4会话上下文。然后，UPF根据SMF发送的参数列表更新此N4会话上下文的参数。UPF响应N4会话修改响应消息，其中包含UPF必须向SMF提供的任何信息，以响应接收到的控制信息。

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

4.SMF与触发此过程的网络实体（如AMF或PCF）进行交互。