Network Resource Fulfilment

In Release 15, the NRF (Network Repository Function) was newly introduced as a core network function providing service registration and discovery, notably for functions like the SMF and UPF. Key capabilities established include NF registration via the NRF service-based interface (Nnrf) and the use of the NRF for UPF discovery, alongside clarifications for its role in roaming architectures. The release also defined procedures for subscription and notification of resource allocation outcomes, and introduced specific resource structures for policy data management.

• NRF service registration TS 29.510CR0032
• NRF Subscription Lifespan TS 29.510CR0053
• Subscription and notification of resources allocation outcome, data model TS 29.514CR0007
• Subscription to resources allocation outcome, service procedures TS 29.514CR0008
• Notification of resource allocation outcome, service procedures TS 29.514CR0009
• AM policy data resource definition TS 29.519CR0010

+ 61 more changes

In Release 16, the NRF's capabilities were expanded to support the discovery of new functions like the HSS and P-CSCF, and to enable registration from functions such as the UDSF and UCMF. It also gained new features for managing application data, including support for AF Available Data Registration and subscription to notifications for specific subsets of policy data. Furthermore, enhancements were made to support resource-level authorization, resource sharing, and network-initiated procedures like the re-activation of user-plane resources.

• NRF based P-CSCF discovery TS 23.501CR1035
• Network request re-activation of user-plane resources TS 23.501CR1351
• Update NRF descriptions to support AF Available Data Registration as described in TS23.288 TS 23.501CR1406
• HSS discovery via NRF TS 23.501CR1438
• Network request re-activation of user-plane resources TS 23.501CR1586
• Update NRF descriptions to support AF Available Data Registration as described in TS23.288 TS 29.510CR0212

+ 64 more changes

In Release 17, the NRF saw enhancements for authorization, service discovery, and support for new services. Specifically, it introduced resource-based authorization for key APIs like Nudm_UEAU and its own services, and it added support for registering capabilities like those from the NWDAF and for new Network Functions such as the MBSF and MB-STF. The release also improved the discovery process by allowing the NRF to indicate altered priorities and whether OAuth2 authorization is required for accessing its services.

• Resource Level Authorization for UECM registrations TS 29.503CR0473
• Resource-based authorization on the Nudm_UEAU API TS 29.503CR0800
• Updating Binding Indication for multiple resource contexts feature TS 29.508CR0169
• NRF supported features in Bootstrapping response TS 29.510CR0431
• NWDAF aggregation capability registration in the NRF TS 29.510CR0505
• NRF Content Encoding Information TS 29.510CR0518

+ 73 more changes

In Release 18, the NRF was enhanced to support the registration and discovery of several new network functions, including the DCSF, MRF, and DCMF. It introduced support for canary testing procedures and added an OAuth2 scope for its Management API. Furthermore, the NRF's capabilities were extended to handle group AF sessions for QoS operations and to support procedures for Federated Learning and NWDAF discovery with ML model provisioning.

• Support of Group AF Sessions for QoS Resource Allocation and QoS monitoring operation TS 23.501CR4128
• Resource and Service Operation for LCS Subscription Data TS 29.503CR1038
• Enhancement of NRF services to support DCSF registration and discovery TS 29.510CR0828
• NRF service enhancement to support MRF registration and discovery TS 29.510CR0837
• NRF service enhancement to support DCMF registration and discovery TS 29.510CR0844
• Support for Canary Testing via NRF TS 29.510CR0852

+ 30 more changes

In Release 19, the NRF (Network Repository Function) was enhanced to support the registration of an IMS Application Server (IMS AS) and to indicate UPF capabilities within its service discovery function. Furthermore, new procedures were defined for NRF discovery reference and for the exposure of AIML_CN (AI/ML Core Network) services. Additional updates included corrections to key retrieval and resource models, along with the addition of a GET method for the PP Data resource.

• Reducing Information Exposure using Resource Content Filters TS 29.510CR1046
• Indicate the UPF capabilities in NRF TS 29.510CR1061
• Support of IMS AS registration to NRF TS 29.510CR1103
• Resource Content Filter examples TS 29.510CR1174
• Corrections to Key Retrieval from NRF TS 29.510CR1246
• Define resource and data model for Nnwdaf_VFLTraining API TS 29.520CR1073

+ 17 more changes