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Content for  TS 29.502  Word version:  18.6.0

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5.2.2.3  Update SM Context service operationp. 29

5.2.2.3.1  Generalp. 29
The Update SM Context service operation shall be used to update an individual SM context and/or provide N1 or N2 SM information received from the UE or the AN, for a given PDU session, towards the SMF, or the V-SMF for HR roaming scenarios, or the I-SMF for a PDU session with an I-SMF.
It is used in the following procedures:
The NF Service Consumer (e.g. AMF) shall update an individual SM context and/or provide N1 or N2 SM information to the SMF by using the HTTP POST method (modify custom operation) as shown in Figure 5.2.2.3.1-1.
Reproduction of 3GPP TS 29.502, Fig. 5.2.2.3.1-1: SM context update
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Step 1.
The NF Service Consumer shall send a POST request to the resource representing the individual SM context resource in the SMF. The content of the POST request shall contain the modification instructions and/or the N1 or N2 SM information, or the indication that the PDU session is allowed to be upgraded to a MA PDU session if so indicated by the UE as specified in clause 6.4.2.2 of TS 24.501, or subscribe/unsubscribe of the DDN failure notification as specified in clause 4.15.3.2.7 of TS 23.502. If the request contains EBI(s) to revoke, then the SMF shall disassociate the EBI(s) with the QFI(s) with which they are associated.
Step 2a.
On success, "204 No Content" or "200 OK" shall be returned; in the latter case, the content of the POST response shall contain the representation describing the status of the request and/or N1 or N2 SM information.
If the ExemptionInd IE is included in the request message, indicating that the NAS SM message included in the request was exempted from NAS congestion control by the AMF, the SMF shall verify that the included 5G SM message can be exempted from a NAS SM congestion control activated in the AMF as specified in clause 5.19.7 of TS 23.501.
The SMF may indicate to the NF Service Consumer that it shall release EBI(s) that were assigned to the PDU session by including the releaseEbiList IE, e.g. when a QoS flow is released.
Step 2b.
On failure or redirection, one of the HTTP status codes listed in Table 6.1.3.3.4.2.2-2 shall be returned. For a 4xx/5xx response, the message body shall contain an SmContextUpdateError structure, including:
  • a ProblemDetails structure with the "cause" attribute set to one of the application errors listed in Table 6.1.3.3.4.2.2-2;
  • N1 SM information, if the SMF needs and can return a response to the UE;
  • N2 SM information, if the SMF needs and can return a response to the NG-RAN.
The following clauses specify additional requirements applicable to specific scenarios.
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