User Plane Connection Reactivation Request
The following call flows captures information on UE idle mode mobility from EPS to 5GS with UP (User Plane) connection reactivation using N26 interface.

Step |
Description |
---|---|
1 |
AMF sends a POST request towards SMF/PGW-C of each UE EPS PDN connection with following information:
|
2 |
Upon receipt of such a request, if:
|
2a |
SMF returns a 201 Created response including the following information:
and, if the PDU session that is derived by the SMF based on the EPS bearer contexts was requested to be re-activated, i.e. if the PDU Session ID was present in the PDU Sessions Activate List,
The Location header present in the POST response contains the URI of the created SM context resource. AMF stores the association of the PDU Session ID and the SMF ID, and allocated EBI(s) associated to the PDU Session ID. If the EPS Bearer Context Status attribute is received in the request, the SMF checks whether some EPS bearer(s) of the corresponding PDU session have been deleted by the UE but not notified to the EPS. If so, SMF releases these EPS bearers, corresponding QoS rules and QoS flow level parameters locally. |
2b |
SMF returns 4xx/5xx failure response if:
|
3 |
If the SMF returns a 200 OK response, the AMF subsequently updates the SM context in the SMF by sending POST request with the following information:
Upon receipt of this request, the SMF:
|
4 |
SMF returns a 200 OK response including the User Plane Connection State attribute representing the final state of the user plane connection. |