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Content for  TS 23.501  Word version:  17.6.0

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7.2  Network Function Servicesp. 481

7.2.1  Generalp. 481

In the context of this specification, an NF service is offering a capability to authorised consumers.
Network Functions may offer different capabilities and thus, different NF services to distinct consumers. Each of the NF services offered by a Network Function shall be self-contained, reusable and use management schemes independently of other NF services offered by the same Network Function (e.g. for scaling, healing, etc).
The discovery of the NF instance and NF service instance is specified in clause 6.3.1.
Reproduction of 3GPP TS 23.501, Fig. 7.2.1-1:	Network Function and NF Service
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Each NF service shall be accessible by means of an interface. An interface may consist of one or several operations.
Reproduction of 3GPP TS 23.501, Fig. 7.2.1-2:	Network Function, NF Service and NF Service Operation
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System procedures, as specified in TS 23.502 can be built by invocation of a number of NF services. The following Figure shows an illustrative example on how a procedure can be built; it is not expected that system procedures depict the details of the NF Services within each Network Function.
Reproduction of 3GPP TS 23.501, Fig. 7.2.1-3:	System Procedures and NF Services
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The following clauses provide for each NF the NF services it exposes through its service based interfaces.

7.2.2  AMF Servicesp. 483

The following NF services are specified for AMF:
Service Name Description Reference in TS 23.502 or indicated other TS
Namf_CommunicationEnables an NF consumer to communicate with the UE and/or the AN through the AMF.
This service enables SMF to request EBI allocation to support interworking with EPS. This service also supports PWS functionality as described in TS 23.041.
5.2.2.2
Namf_EventExposureEnables other NF consumers to subscribe or get notified of the mobility related events and statistics. 5.2.2.3
Namf_MTEnables an NF consumer to make sure UE is reachable. 5.2.2.4
Namf_LocationEnables an NF consumer to request location information for a target UE. 5.2.2.5
Namf_MBSBroadcastEnables the NF consumer to communicate with the NG-RAN for broadcast communication.TS 23.247
Namf_MBSCommunicationEnables NF consumer to communicate with the NG-RAN for multicast communication.TS 23.247
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7.2.3  SMF Servicesp. 483

The following NF services are specified for SMF:
Service Name Description Reference in TS 23.502
Nsmf_PDUSessionThis service manages the PDU Sessions and uses the policy and charging rules received from the PCF. The service operations exposed by this NF service allows the consumer NFs to handle the PDU Sessions. 5.2.8.2
Nsmf_EventExposureThis service exposes the events happening on the PDU Sessions to the consumer NFs. 5.2.8.3
Nsmf_NIDDThis service is used for NIDD transfer between SMF and another NF. 5.2.8.4
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7.2.4  PCF Servicesp. 483

The following NF services are specified for PCF:
Service Name Description Reference in TS 23.502 or indicated other TS
Npcf_AMPolicyControlThis PCF service provides Access Control, network selection and Mobility Management related policies, UE Route Selection Policies to the NF consumers. 5.2.5.2
Npcf_SMPolicyControlThis PCF service provides session related policies to the NF consumers. 5.2.5.4
Npcf_PolicyAuthorizationThis PCF service authorises an AF request and creates policies as requested by the authorised AF for the PDU Session to which the AF session is bound to. This service allows the NF consumer to subscribe/unsubscribe to the notification of Access Type and RAT type, PLMN identifier, access network information, usage report etc. 5.2.5.3
Npcf_BDTPolicyControlThis PCF service provides background data transfer policy negotiation and optionally notification for the renegotiation to the NF consumers. 5.2.5.5
Npcf_UEPolicyControlThis PCF service provides the management of UE Policy Association to the NF consumers. 5.2.5.6
Npcf_EventExposureThis PCF service provide the support for event exposure. 5.2.5.7
Npcf_AMPolicyAuthorizationThe PCF authorises an AF request and uses it as input for deciding access and mobility management related policies for a UE. 5.2.5.8
Npcf_MBSPolicyControlThe PCF service provides MBS session related policies towards the MB-SMF. TS 23.247
Npcf_MBSPolicyAuthorizationThis service authorizes an AF / NEF / MBSF request for an MBS service and t creates policies as requested by the authorized AF for the MBS Service. TS 23.247
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7.2.5  UDM Servicesp. 484

The following NF services are specified for UDM:
Service Name Description Reference in TS 23.502
Nudm_UECM
  1. Provide the NF consumer of the information related to UE's transaction information, e.g. UE's serving NF identifier, UE status, etc.
  2. Allow the NF consumer to register and deregister its information for the serving UE in the UDM.
  3. Allow the NF consumer to update some UE context information in the UDM.
5.2.3.2
Nudm_SDM
  1. Allow NF consumer to retrieve user subscription data when necessary.
  2. Provide updated user subscriber data to the subscribed NF consumer.
5.2.3.3
Nudm_UEAuthentication
  1. Provide updated authentication related subscriber data to the subscribed NF consumer.
  2. For AKA based authentication, this operation can be also used to recover from security context synchronization failure situations.
  3. Used for being informed about the result of an authentication procedure with a UE.
5.2.3.4
Nudm_EventExposure
  1. Allow NF consumer to subscribe to receive an event.
  2. Provide monitoring indication of the event to the subscribed NF consumer.
5.2.3.5
Nudm_ParameterProvision
  1. To provision information which can be used for the UE in 5GS.
5.2.3.6
Nudm_NIDDAuthorisation
  1. To authorise an NIDD configuration request for the received External Group Identifier or GPSI.
5.2.3.7
Nudm_ServiceSpecificAuthorisation
  1. To authorise for a specific service configuration.
5.2.3.8
Nudm_ReportSMDeliveryStatus
  1. To report the SM-Delivery Status to UDM.
5.2.3.9
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7.2.6  NRF Servicesp. 485

The following NF services are specified for NRF:
Service Name Description Reference in TS 23.502
Nnrf_NFManagementProvides support for register, deregister and update service to NF, NF services.
Provides NF service consumers and SCP with notifications of newly registered/updated/deregistered NF along with its NF services, SCP.
Also Provides SCP with notifications of newly registered/updated/deregistered SCP.
5.2.7.2
Nnrf_NFDiscoveryEnables one NF service consumer or SCP to discover a set of NF instances with specific NF service or a target NF type. Also enables one NF service consumer or SCP to discover a specific NF service. Also enables a SCP to discover a next hop SCP. 5.2.7.3
Nnrf_AccessTokenProvides OAuth2 2.0 Access Tokens for NF to NF authorization as defined in TS 33.501. 5.2.7.4
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7.2.7  AUSF Servicesp. 486

The following NF services are specified for AUSF:
Service Name Description Reference in TS 23.502
Nausf_UEauthenticationThe AUSF provides UE authentication service to requester NF. For AKA based authentication, this operation can also be used to recover from security context synchronization failure situations. 5.2.10.2
Nausf_SoRProtectionThe AUSF provides protection of Steering of Roaming information service to the requester NF. 5.2.10.3
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7.2.8  NEF Servicesp. 486

The following NF services are specified for NEF:
Service Name Description Reference in TS 23.502 or other TS
Nnef_EventExposureProvides support for event exposure. 5.2.6.2
Nnef_PFDManagementProvides support for PFDs management. 5.2.6.3
Nnef_ParameterProvisionProvides support to provision information which can be used for the UE in 5GS. 5.2.6.4
Nnef_TriggerProvides support for device triggering. 5.2.6.5
Nnef_BDTPNegotiationProvides support for background data transfer policy negotiation and optionally notification for the renegotiation. 5.2.6.6
Nnef_TrafficInfluenceProvide the ability to influence traffic routing. 5.2.6.7
Nnef_ChargeablePartyRequests to become the chargeable party for a data session for a UE. 5.2.6.8
Nnef_AFsessionWithQoSRequests the network to provide a specific QoS for an AS session. 5.2.6.9
Nnef_MSISDN-less_MO_SMSUsed by the NEF to send MSISDN-less MO SM to the AF. 5.2.6.10
Nnef_ServiceParameterProvides support to provision service specific information. 5.2.6.11
Nnef_APISupportCapabilityProvides support for awareness on availability or expected level of a service API. 5.2.6.12
Nnef_NIDDConfigurationUsed for configuring necessary information for data delivery via the NIDD API. 5.2.6.13
Nnef_NIDDUsed for NEF anchored MO and MT unstructured data transport. 5.2.6.14
Nnef_SMContextProvides the capability to create, update or release the SMF-NEF Connection. 5.2.6.15
Nnef_AnalyticsExposureProvides support for exposure of network analytics. 5.2.6.16
Nnef_UCMFProvisioningProvides the ability to configure the UCMF with dictionary entries consisting of UE manufacturer-assigned UE Radio Capability IDs, the corresponding UE radio capabilities, the corresponding UE Radio Capability for Paging and the (list of) associated IMEI/TAC value(s) via the NEF. The UE radio capabilities the NEF provides for a UE radio Capability ID can be in TS 36.331 format, TS 38.331 format or both formats. Also used for deletion (e.g. as no longer used) or update (e.g. to add or remove a (list of) IMEI/TAC value(s) associated to an entry) of dictionary entries in the UCMF. 5.2.6.17
Nnef_ECRestrictionProvides support for queuing status of enhanced coverage restriction, or enable/disable enhanced coverage restriction per individual UEs. 5.2.6.18
Nnef_ApplyPolicyProvides the capability to apply a previously negotiated Background Data Transfer Policy to a UE or a group of UEs. 5.2.6.19
Nnef_LocationProvides the capability to deliver UE location to AF. 5.2.6.21
Nnef_AMInfluenceProvides the ability to influence access and mobility management related policies for one or multiple UEs. 5.2.6.22
Nnef_AMPolicyAuthorizationProvides the ability to provide inputs that can be used by the PCF for deciding access and mobility management related policies. 5.2.6.23
Nnef_AKMAAKMA Application Key derivation service. TS 33.535
Nnef_AuthenticationThis service enables the consumer to authenticate and authorize the Service Level Device Identity as described in TS 23.256. TS 23.256
Nnef_TimeSynchronizationProvides the ability to support for (g)PTP or 5G access stratum based time synchronization service. 5.2.6.25
Nnef_EASDeploymentEAS deployment service. 5.2.6.26
Nnef_UEIdUE Identifier service, which supports to retrieve AF specific UE Identifier based on UE address. 5.2.6.27
Nnef_MBSTMGIAllows AF to request allocation/deallocation of TMGI(s) for MBS Session. TS 23.247
Nnef_MBSSessionAllows AF to create, update and delete MBS Session. TS 23.247
Nnef_ASTIProvides the ability to influence 5G access stratum based time distribution configuration. 5.2.6.28
Nnef_SMServiceUsed for SBI-based MO SM transmit through NEF for MSISDN-less MO SMS. 5.2.6.29
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7.2.8AVoid

7.2.9  SMSF Servicesp. 489

The following NF services are specified for SMSF:
Service Name Description Reference in TS 23.502
Nsmsf_SMServiceThis service allows AMF to authorize SMS and activate SMS for the served user on SMSF.
Additionally, this service allows downlink SMS message transmit from consumer NF to SMSF.
5.2.9.2
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7.2.10  UDR Servicesp. 489

The following NF services are specified for UDR:
Service Name Description Reference in TS 23.502
Nudr_DMAllows NF consumers to retrieve, create, update, subscribe for change notifications, unsubscribe for change notifications and delete data stored in the UDR, based on the set of data applicable to the consumer.
This service may also be used to manage operator specific data.
5.2.12.2
Nudr_GroupIDmapAllows NF consumers to retrieve a NF group ID corresponding to a subscriber identifier. 5.2.12.3
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7.2.11  5G-EIR Servicesp. 489

The following NF services are specified for 5G-EIR:
Service Name Description Reference in TS 23.502
N5g-eir_Equipment Identity CheckThis service enables the 5G-EIR to check the PEI and check whether the PEI is in the prohibited list or not. 5.2.4.2
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7.2.12  NWDAF Servicesp. 490

The following NF services are specified for NWDAF:
Service Name Description Reference in TS 23.288
Nnwdaf_AnalyticsSubscriptionThis service enables the NF service consumers to subscribe/unsubscribe for different type of analytics from NWDAF or enables NWDAF to request transfer of analytics context from another NWDAF. 7.2
Nnwdaf_AnalyticsInfoThis service enables the NF service consumers to request and get different type of analytics information from NWDAF. 7.3
Nnwdaf_DataManagementThis service enables the NF service consumer to subscribe/unsubscribe and fetch data from NWDAF. 7.4
Nnwdaf_MLModelProvisionThis service enables the consumer to receive a notification when an ML model matching the subscription parameters becomes available in NWDAF containing MTLF. 7.5
Nnwdaf_MLModelInfoThis service enables the consumer to request and get ML Model Information from NWDAF containing MTLF. 7.6
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7.2.13  UDSF Servicesp. 490

The following NF services are specified for UDSF:
Service Name Description Reference in TS 23.502
Nudsf_UnstructuredDataManagementAllows NF consumers to retrieve, create, update, and delete data stored in the UDSF. 5.2.14.2
Nudsf_TimerAllows NF consumers to start, stop, update, and search timers in UDSF. NF consumers may be notified about timer expiry. 5.2.14.3
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7.2.14  NSSF Servicesp. 490

The following NF services are specified for NSSF:
Service Name Description Reference in TS 23.502
Nnssf_NSSelectionProvides the requested Network Slice information to the Requester. 5.2.16.2
Nnssf_NSSAIAvailabilityProvides NF consumer on the availability of S-NSSAIs on a per TA basis. 5.2.16.3
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7.2.15  BSF Servicesp. 490

The following NF services are specified for BSF as described in TS 23.503:
Service Name Description Reference in TS 23.502
Nbsf_ManagementAllows a PCF to register/deregister itself and to be discoverable by NF service consumers (NOTE 1). 5.2.13.2
NOTE 1:
There may be both PCF for a PDU Session and PCF for a UE. Each of them may separately and independently register itself at the BSF. Each of them may separately and independently be discovered by a consumer of the BSF.
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7.2.16  LMF Servicesp. 491

The following NF services are specified for LMF:
Service Name Description Reference in TS 23.273
Nlmf_LocationThis service enables an NF to request location determination for a target UE for the Immediate Location Request and to subscribe / get notified of the location determination for a Deferred Location Request. It allow NFs to request or subscribe the current geodetic and optionally civic location of a target UE. 8.3
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7.2.16A  GMLC Services |R16|p. 491

The following NF services are specified for GMLC:
Service Name Description Reference in TS 23.273
Ngmlc_LocationThis service enables an NF to request location determination for a target UE. 8.4
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7.2.17  CHF Servicesp. 491

The following NF services for spending limits and charging are specified for CHF.
Service Name Description Reference in TS 23.502
Nchf_SpendingLimitControlThis service enables transfer of policy counter status information relating to subscriber spending limits from CHF to NF consumer and described in TS 23.503. 5.2.17.2
Nchf_Converged_ChargingThis service enables converged online and offline charging, as described in TS 32.290.-
Nchf_OfflineOnlyChargingThis service enables only offline charging, as described in TS 32.290-
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7.2.18  UCMF Services |R16|p. 491

The following NF services are specified for UCMF:
Service Name Description Reference in TS 23.502
Nucmf_ProvisioningAllows the NF consumer to provision a dictionary entry in the UCMF consisting of a Manufacturer-assigned UE Radio Capability ID, the corresponding UE Radio Capability for Paging and the corresponding UE radio capabilities and the (list of) associated IMEI/TAC value(s). The UE radio capabilities the NEF provides for a UE radio Capability ID can be in TS 36.331 format, TS 38.331 format or both formats. Also used for deletion (e.g. as no longer used) or update (e.g. to add or remove a (list of) IMEI/TAC value(s) associated to an entry) of dictionary entries in the UCMF. 5.2.18.2
Nucmf_UECapabilityManagementAllows the NF consumer to resolve UE Radio Capability ID (either Manufacturer-assigned or PLMN-assigned) into the corresponding UE radio capabilities and the corresponding UE Radio Capability for Paging. The consumer shall indicate whether it requests a TS 36.331 format or a TS 38.331 format to be provided.
Allows the NF consumer to obtain a PLMN-assigned UE Radio Capability ID for a specific UE radio capabilities. The consumer shall indicate whether the UE radio capabilities sent to UCMF are in TS 36.331 format, TS 38.331, or both.
Allows the NF consumer to subscribe or unsubscribe for notifications of UCMF dictionary entries.
Allows the NF consumer to be notified about creation and deletion of UCMF dictionary entries.
5.2.18.3
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7.2.19  AF Services |R16|p. 492

The following NF services are specified for AF:
Service Name Description Reference in TS 23.502 or other TS
Naf_EventExposureThis service enables consumer NF(s) to subscribe or get notified of the event as described in TS 23.288. 5.2.19.2
Naf_ProSe This service is for ProSe services as described in TS 23.304. TS 23.304
Naf_Authentication This service enables the consumer to authenticate and authorize the Service Level Device Identity as described in TS 23.256. TS 23.256
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7.2.20  NSSAAF Services |R16|p. 492

The following NF services are specified for NSSAAF:
Service Name Description Reference in TS 23.502
Nnssaaf_NSSAAThe NSSAAF provides NSSAA service to the requester NF by relaying EAP messages towards a AAA-S or AAA-P and performing related protocol conversion as needed. It also provides notification to the current AMF where the UE is of the need to re-authenticate and re-authorize the UE or to revoke the UE authorization. 5.2.20.2
Nnssaaf_AIWThe NSSAAF provides AIW (AAA interworking) service to the requester NF by relaying EAP messages towards a AAA-S or AAA-P and performing related protocol conversion as needed. 5.2.20.3
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7.2.21  DCCF Services |R17|p. 493

The following NF services are specified for DCCF:
Service Name Description Reference in TS 23.288
Ndccf_DataManagementThis service enables a Data Consumer to request data, and have it delivered via a messaging framework or via the DCCF, while avoiding redundant requests to data sources. 8.2
Ndccf_ContextManagementThis service allows a network function to register/deregister the availability of data with the DCCF. 8.3
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7.2.22  MFAF Services |R17|p. 493

The following NF services are specified for MFAF:
Service Name Description Reference in TS 23.288
Nmfaf_3daDataManagementThis service allows a DCCF to request a messaging framework to provide collected data to consumers or notification endpoints according to processing and formatting instructions. 9.2
Nmfaf_3caDataManagementThis service allows a messaging framework to provide data to consumers or notification endpoints according to instructions received via the Nmfaf_3da_DataManagement service. 9.3
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7.2.23  ADRF Services |R17|p. 493

The following NF services are specified for ADRF:
Service Name Description Reference in TS 23.288
Nadrf_DataManagementThis service allows consumers to store, retrieve and delete data or analytics in an ADRF. 10.2
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7.2.24  5G DDNMF Services |R17|p. 494

The 5G DDNMF supports the N5g-ddnmf service defined in clause 7.1 of TS 23.304.

7.2.25  EASDF Services |R17|p. 494

The following NF services are specified for EASDF.
Service Name Description Reference in TS 23.548
Neasdf_DNSContextThis service enables the consumer to create, update and delete DNS context in EASDF, or subscribe to DNS message reporting from EASDF.
DNS contexts in EASDF include rules on how EASDF is to handle DNS messages.
7.1.2
Neasdf_BaselineDNSPatternThis service enables the consumer to create, update and delete BaselineDNSPattern in EASDF. 7.1.3
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7.2.26  TSCTSF Services |R17|p. 494

The following NF services are specified for TSCTSF.
Service Name Description Reference in TS 23.502
Ntsctsf_TimeSynchronizationrovides support for time synchronization service based on (g)PTP or 5G access stratum time distribution method as described in clause 5.27.1.8. Allows the NF consumer to subscribe for the UE and 5GC capabilities for (g)PTP or 5G access stratum based time synchronization service. Allows the NF consumer to configure the UEs and the 5GC for the (g)PTP based time synchronization service. 5.2.27.2
Ntsctsf_QoSand TSCAssistanceAllows the NF consumer to provide QoS parameters and information to create TSC Assistance Container. 5.2.27.3
Ntsctsf_ASTIProvides support for time synchronization service based on 5G access stratum time distribution method as described in clause 5.27.1.8. Allows the NF consumer to configure the 5GC and RAN for 5G access stratum based time synchronization service for the UEs. 5.2.27.4
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7.2.27  NSACF Services |R17|p. 495

The following NF services are specified for NSACF:
Service Name Description Reference in TS 23.502
Nnsacf_NSACThis service enables consumer NF to check the availability per network slice and update the number of UEs registered with a network slice or the number of PDU Sessions established on a network slice. 5.2.21.2
Nnsacf_SliceEventExposureThis service enables consumer NF(s) to subscribe and get notified of the event as described in clause 5.15.11.4. 5.2.21.4
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7.2.28  MB-SMF Services |R17|p. 495

The following NF service is specified for MB-SMF.
Service Name Description Reference in TS 23.247
Nmbsmf_TMGIThis service enables NF service consumer to allocate, refresh and deallocate TMGI(s). 9.1.2
Nmbsmf_MBSSessionThis service enables the consumer to create, update and delete the MBS Session. 9.1.3
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7.3  Exposurep. 496

Network exposure is described in clause 5.20 and in clause 4.15 of TS 23.502.

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