The procedure as specified in TS 23.401, clause 5.10.3
applies with the following modification:
(RRC Connection Reconfiguration): On receiving the NAS Deactivate EPS Bearer Context Request(LBI) message, if the UE has mapped 5G parameters for the PDU session, the UE deletes the corresponding mapped 5GS PDU session.
In addition if the SMF+PGW-C has registered to HSS+UDM for this PDN connection before, the SMF+PGW-C invokes the Nudm_UECM_Deregistration
service operation to notify the UDM to remove the association between the SMF+PGW-C identity and the associated DNN and PDU Session Id as described in the step 12 of clause 220.127.116.11
. If there is no PDN connection for the associated (DNN, S-NSSAI) handled by the SMF+PGW-C, the SMF+PGW-C unsubscribes from Session Management Subscription data changes notification with the HSS+UDM by means of the Nudm_SDM_Unsubscribe
(SUPI, DNN, S-NSSAI) service operation as described in step 12 of clause 18.104.22.168
The procedures specified in TS 23.401, clause 5.4.1
through 5.4.5 apply with the following modifications:
PCRF initited IP-CAN Modification in TS 23.401 is replaced with PCF initiated SM Policy Association Modification as specified in clause 22.214.171.124. PCEF initiated IP-CAN Session Modification/Termination TS 23.401 is replaced with SM Policy Association Modification/Terminationg as specified in clauses 4.16.5 and 4.16.6.
In the step where the PDN-GW sends a Create Bearer Request, i.e.
the PCO includes mapped 5GS QoS parameters for the EPS bearer being created.
In the step where the PDN-GW sends an Update Bearer Request, i.e.,
the PCO includes the modification to the mapped 5GS QoS parameters, if impacted by the modification, corresponding to the EPS bearer being modified.
In the step where the UE receives the NAS Session Management message from the MME which contains the PCO relayed via the MME, i.e:
the UE updates the mapped 5G QoS parameters as included in the PCO from the PDN-GW.
In the step where the UE receives EPS bearer request message, i.e
the UE also deletes the mapped 5GS QoS flow and its associated parameter.