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Content for  TS 23.632  Word version:  17.0.0

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6  Network Function Service proceduresWord‑p. 45

6.1  HSS Services

6.1.1  General

The following table illustrates the HSS Services.
NF service Service Operations Operation Semantics Example Consumer(s)
UE AuthenticationGetRequest/ResponseUDM
UECMSNDeregistrationRequest/ResponseUDM
UpdateRequest/ResponseUDM
SDMGetRequest/ResponseUDM
SubscribeSubscribe/NotifyUDM
Unsubscribe
Notify
EESubscribeSubscribe/NotifyUDM
Unsubscribe
Notify
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6.1.2  Nhss_UEAuthentication service

6.1.2.1  Nhss_UEAuthentication_Get service operation

Service operation name:
Nhss_UEAuthentication_Get
Description:
Requester NF gets the authentication vector from HSS. For AKA based authentication, this operation can be also used to recover from synchronization failure situations.
Inputs, Required:
IMSI, authentication method, serving network name.
Inputs, Optional:
Synchronization Failure indication and related information (i.e. RAND/AUTS).
Outputs, Required:
Authentication vector.
Outputs, Optional:
None.

6.1.3  Nhss_UECM service

6.1.3.1  Nhss_UECM_SNDeregistration service operation

Service operation name:
Nhss_UECM_SNDeregistration.
Description:
The NF consumer requests the HSS to initiate cancel location to the Serving Node registered in HSS serving the UE in EPS and/or PS, if any.
Inputs, Required:
IMSI, deregistration reason.
Inputs, Optional:
None.
Outputs, Required:
Result Indication.
Outputs, Optional:
None.

6.1.3.2  Nhss_UECM_Update service operationWord‑p. 46

Service operation name:
Nhss_UECM_Update.
Description:
The NF consumer informs the HSS about an update in the UE Context (e.g. a change in the IMEI).
Inputs, Required:
IMSI.
Inputs, Optional:
IMEI(SV), serving PLMN.
Outputs, Required:
Result Indication.
Outputs, Optional:
None.

6.1.4  Nhss_SDM service

6.1.4.1  Nhss_SDM_Get service operation

Service operation name:
Nhss_SDM_Get
Description:
The consumer NF gets the subscriber data indicated by the requested data type from HSS. In this release, only the PGW-C+SMF FQDN for S5/S8/S2b interface information is supported as requested data type.
Inputs, Required:
IMSI, requested data.
Inputs, Optional:
None.
Outputs, Required:
The consumer NF gets the requested subscription data
Outputs, Optional:
None.

6.1.4.2  Nhss_SDM_Notification service operation

Service or Service operation name:
Nhss_SDM_Notification
Description:
The HSS notifies NF consumer of the updates of the subscriber data indicated by the "subscription data Type" input. In this release, only the PGW-C+SMF FQDN for S5/S8/S2b interface information is supported as subscription data type.
Inputs, Required:
IMSI, Subscription data type(s).
Inputs, Optional:
None.
Outputs, Required:
Result Indication.
The HSS invokes this service operation under the following cases:
  • When the PGW-C+SMF FQDN for S5/S8/S2b interface information is updated at the HSS, the updated information is notified to the NF consumer that has subscribed for the specific subscription data type to be notified.
Outputs, Optional:
None.
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6.1.4.3  Nhss_SDM_Subscribe service operation

Service operation name:
Nhss_SDM_Subscribe
Description:
The NF consumer subscribes for updates to the subscriber data indicated by the 'subscription data type' input. The HSS shall check the requested consumer is authorized to subscribe to requested updates. In this release, only the PGW-C+SMF FQDN for S5/S8/S2b interface information is supported as subscription data type.
Inputs, Required:
IMSI, Subscription data type(s).
Inputs, Optional:
None.
Outputs, Required:
None.
Outputs, Optional:
None.

6.1.4.4  Nhss_SDM_Unsubscribe service operationWord‑p. 47

Service operation name:
Nhss_SDM_Unsubscribe
Description:
The NF consumer unsubscribes from updates to the subscriber data indicated by the 'subscription data type' input. In this release, only the PGW-C+SMF FQDN for S5/S8 interface information is supported as subscription data type.
Inputs, Required:
IMSI, Subscription data type(s).
Inputs, Optional:
None.
Outputs, Required:
None.
Outputs, Optional:
None.

6.1.5  Nhss_EE service

6.1.5.1  Nhss_EE_Subscribe service operation

Service operation name:
Nhss_EE_Subscribe.
Description:
The NF consumer request the HSS to subscribe to notifications for monitoring events as described in TS 23.682 (e.g. location change).
Inputs, Required:
IMSI, monitoring event type(s), notification address.
Inputs, Optional:
-
Outputs, Required:
Result Indication, Subscription ID.
Outputs, Optional:
None.

6.1.5.2  Nhss_EE_Unsubscribe service operation

Service operation name:
Nhss_EE_Unsubscribe.
Description:
The NF consumer request the HSS to delete the subscription of a monitoring event.
Inputs, Required:
Subscription ID.
Inputs, Optional:
-
Outputs, Required:
Operation execution result indication.
Outputs, Optional:
None.

6.1.5.3  Nhss_EE_Notify service operation

Service operation name:
Nhss_EE_Notify.
Description:
The HSS reports the monitoring event to the consumer that has previously subscribed.
Inputs, Required:
Event ID, Notification Correlation Information, time stamp.
Inputs, Optional:
Event specific parameters list.
Outputs, Required:
None.
Outputs, Optional:
None.

6.2  UDM ServicesWord‑p. 48

6.2.1  General

The following table illustrates the UDM Services.
NF service Service Operations Operation Semantics Example Consumer(s)
UECMP-CscfRestorationTriggerRequest/ResponseHSS
GetRequest/ResponseHSS
AMFDeregistrationRequest/ResponseHSS
UpdateRequest/ResponseHSS
MTProvideDomainSelectionInfoRequest/ResponseHSS
ProvideUserStateRequest/ResponseHSS
ProvideLocationInfoRequest/ResponseHSS
Provide5GSRVCCInfoRequest/ResponseHSS
EventExposureSubscribeSubscribe/NotifyHSS
Notify
UEAUGetHssAvRequest/ResponseHSS
SDMGetRequest/ResponseHSS
SubscribeSubscribe/NotifyHSS
Unsubscribe
Notify
PPUpdateRequest/ResponseHSS
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6.2.2  Nudm_UECM service operation

6.2.2.1  Nudm_UECM_P-CscfRestorationTrigger service operation

Service operation name:
Nudm_UECM_P-CscfRestorationTrigger
Description:
Requester NF (HSS) triggers the UDM to notify all NFs (AMF, SMF) that have previously subscribed to receive notifications for P-CSCF restoration.
Inputs, Required:
SUPI.
Inputs, Optional:
None.
Outputs, Required:
None.
Outputs, Optional:
None.

6.2.2.2  Nudm_UECM_Get service operation

6.2.2.3  Nudm_UECM_AMFDeregistration service operation

Service operation name:
Nudm_UECM_AMFDeregistration.
Description:
The NF consumer requests the UDM to initiate deregistration of the AMF serving the UE, if any.
Inputs, Required:
SUPI, deregistration reason.
Inputs, Optional:
None.
Outputs, Required:
Result Indication.
Outputs, Optional:
None.

6.2.2.4  Nudm_UECM_Update service operationWord‑p. 49

6.2.3  Nudm_MT Service

6.2.3.1  Nudm_MT_ProvideDomainSelectionInfo Service

Service operation name:
Nudm_MT_ProvideDomainSelectionInfo
Description:
Provides the UE information for terminating domain selection of IMS voice in 5G to the consumer NF (HSS).
Inputs, Required:
SUPI.
Inputs, Optional:
None.
Outputs, Required:
Success/Failure indication.
Outputs, Optional:
Indication of supporting IMS voice over PS Session or not, Time stamp of the last radio contact with the UE, Current RAT type.

6.2.3.2  Nudm_MT_ProvideUserState service operation

Service operation name:
Nudm_MT_ProvideUserState
Description:
Provides the UE's 5GS PS User State to the consumer NF (HSS).
Inputs, Required:
SUPI.
Inputs, Optional:
None.
Outputs, Required:
Success/Failure indication.
Outputs, Optional:
5GS User State.

6.2.3.3  Nudm_MT_ProvideLocationInfo service operation

Service operation name:
Nudm_MT_ProvideLocationInfo
Description:
Provides the UE's 5GS location information to the consumer NF (HSS).
Inputs, Required:
SUPI, Current Location Indicator, Serving Node Indication, Local Time Zone Indication, and RAT-Type requested Indicator.
Inputs, Optional:
None.
Outputs, Required:
Success/Failure indication.
Outputs, Optional:
5GS location information.

6.2.3.4  Nudm_MT_Provide5GSRVCCInfo Operation

Service operation name:
Nudm_MT_ProvideSRVCCInfo
Description:
Provides the UE PS to CS SRVCC capability for the UE to the consumer NF (HSS).
Inputs, Required:
SUPI.
Inputs, Optional:
None.
Outputs, Required:
Success/Failure indication.
Outputs, Optional:
Indication of the UE supporting SRVCC capability or not, If the 5GS supports 5G-SRVCC, an STN-SR and a C-MSIDSN.

6.2.4  Nudm_EE ServiceWord‑p. 50

6.2.4.1  Nudm_EventExposure_Subscribe service operation

See clause 5.2.3.5.2 of TS 23.502.
When used by the HSS in MT-SMS delivery failure scenarios (see clause 5.5.3) the subscribe request shall be a one-time subscription for UE-reachability for SMS and shall indicate whether it is applicable to 3GPP access, Non3GPP access or both.

6.2.4.2  Nudm_EventExposure_Notify service operation

See clause 5.2.3.5.4 of TS 23.502.
When used by the HSS in SMS Alerting scenarios (see clause 5.5.4) the notify request shall indicate whether it is applicable to 3GPP access or Non3GPP access.

6.2.5  Nudm_UEAuthentication service

6.2.5.1  Nudm_UEAuthentication_GetHssAv service operation

Service operation name:
Nudm_UEAuthentication_GetHssAv
Description:
Requester NF gets the authentication vector from UDM. For AKA based authentication, this operation can be also used to recover from synchronization failure situations.
Inputs, Required:
SUPI, authentication method (e.g. EAP-AKA', EPS-AKA, IMS-AKA, GBA-AKA), serving network name.
Inputs, Optional:
Synchronization Failure indication and related information (i.e. RAND/AUTS).
Outputs, Required:
Authentication vector.
Outputs, Optional:
None.

6.2.6  Nudm_SDM service operations

6.2.7  Nudm_PP service operationsWord‑p. 51

6.2.7.1  Nudm_PP_Update service operation

Service operation name:
Update
Description:
Removes, provides or modifies the STN-SR, CMSISDN, if the 5GS support 5G-SRVCC.
Inputs, Required:
None.
Inputs, Optional:
SUPI, STN-SR, CMSISDN.
Outputs, Required:
Success/Failure indication.
Outputs, Optional:
None.

6.3  UDR Services

The UDM and optionally the HSS shall make use of the Nudr_DataRepository Query service operations specified in TS 23.502 to retrieve Authentication Subscription Data. If the subscribed authentication method is 5G_AKA or EAP_AKA_PRIME, the AuthenticationSubscriptionData shall include an indicator indicating whether for the identified subscriber authentication vector generation is to be performed by the HSS.
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$  Change historyWord‑p. 52


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