{"topic":{"id":"5gc-sbi","name":"5GC Service-Based Architecture","summary":"Stage-3 service APIs and discovery for AMF, SMF, UDM, AUSF and NRF.","facets":["SBI","AMF","SMF","UDM","AUSF","NRF"],"provenance_type":"curated","review_state":"reviewed","source_url":"https://portal.3gpp.org/desktopmodules/Specifications/SpecificationDetails.aspx?specificationId=3340","valid_from_release":"Rel-15","valid_to_release":null},"release":"Rel-9","release_state":{"applicable":false,"note":"reviewed mapping begins in Rel-15"},"specifications":[{"number":"23.501","type":"TS","title":"System architecture for the 5G System (5GS)","status":"Under change control","initial_release":"Rel-15","primary_group":"S2","portal_url":"https://portal.3gpp.org/desktopmodules/Specifications/SpecificationDetails.aspx?specificationId=3144","dynareport_url":"https://www.3gpp.org/dynareport/23501.htm","classifications":[],"lineage_layer":{"id":"architecture","label":"System architecture & procedures / Stage 2 orientation","provenance_type":"inferred","review_state":"candidate","source_url":null,"note":"Orientation inferred from the 23-series; this is not an official 3GPP stage assignment."}},{"number":"23.502","type":"TS","title":"Procedures for the 5G System (5GS)","status":"Under change control","initial_release":"Rel-15","primary_group":"S2","portal_url":"https://portal.3gpp.org/desktopmodules/Specifications/SpecificationDetails.aspx?specificationId=3145","dynareport_url":"https://www.3gpp.org/dynareport/23502.htm","classifications":[],"lineage_layer":{"id":"architecture","label":"System architecture & procedures / Stage 2 orientation","provenance_type":"inferred","review_state":"candidate","source_url":null,"note":"Orientation inferred from the 23-series; this is not an official 3GPP stage assignment."}},{"number":"29.500","type":"TS","title":"5G System; Technical Realization of Service Based Architecture; Stage 3","status":"Under change control","initial_release":"Rel-15","primary_group":"C4","portal_url":"https://portal.3gpp.org/desktopmodules/Specifications/SpecificationDetails.aspx?specificationId=3338","dynareport_url":"https://www.3gpp.org/dynareport/29500.htm","classifications":[],"lineage_layer":{"id":"core_protocol","label":"Core-network protocol & service realization","provenance_type":"inferred","review_state":"candidate","source_url":null,"note":"Orientation inferred from the 29-series; this is not an official 3GPP stage assignment."}},{"number":"29.501","type":"TS","title":"5G System; Principles and Guidelines for Services Definition; Stage 3","status":"Under change control","initial_release":"Rel-15","primary_group":"C4","portal_url":"https://portal.3gpp.org/desktopmodules/Specifications/SpecificationDetails.aspx?specificationId=3341","dynareport_url":"https://www.3gpp.org/dynareport/29501.htm","classifications":[],"lineage_layer":{"id":"core_protocol","label":"Core-network protocol & service realization","provenance_type":"inferred","review_state":"candidate","source_url":null,"note":"Orientation inferred from the 29-series; this is not an official 3GPP stage assignment."}},{"number":"29.502","type":"TS","title":"5G System; Session Management Services; Stage 3","status":"Under change control","initial_release":"Rel-15","primary_group":"C4","portal_url":"https://portal.3gpp.org/desktopmodules/Specifications/SpecificationDetails.aspx?specificationId=3340","dynareport_url":"https://www.3gpp.org/dynareport/29502.htm","classifications":[],"lineage_layer":{"id":"core_protocol","label":"Core-network protocol & service realization","provenance_type":"inferred","review_state":"candidate","source_url":null,"note":"Orientation inferred from the 29-series; this is not an official 3GPP stage assignment."}},{"number":"29.503","type":"TS","title":"5G System; Unified Data Management Services; Stage 3","status":"Under change control","initial_release":"Rel-15","primary_group":"C4","portal_url":"https://portal.3gpp.org/desktopmodules/Specifications/SpecificationDetails.aspx?specificationId=3342","dynareport_url":"https://www.3gpp.org/dynareport/29503.htm","classifications":[],"lineage_layer":{"id":"core_protocol","label":"Core-network protocol & service realization","provenance_type":"inferred","review_state":"candidate","source_url":null,"note":"Orientation inferred from the 29-series; this is not an official 3GPP stage assignment."}},{"number":"29.509","type":"TS","title":"5G System; Authentication Server Services; Stage 3","status":"Under change control","initial_release":"Rel-15","primary_group":"C4","portal_url":"https://portal.3gpp.org/desktopmodules/Specifications/SpecificationDetails.aspx?specificationId=3343","dynareport_url":"https://www.3gpp.org/dynareport/29509.htm","classifications":[],"lineage_layer":{"id":"core_protocol","label":"Core-network protocol & service realization","provenance_type":"inferred","review_state":"candidate","source_url":null,"note":"Orientation inferred from the 29-series; this is not an official 3GPP stage assignment."}},{"number":"29.510","type":"TS","title":"5G System; Network function repository services; Stage 3","status":"Under change control","initial_release":"Rel-15","primary_group":"C4","portal_url":"https://portal.3gpp.org/desktopmodules/Specifications/SpecificationDetails.aspx?specificationId=3345","dynareport_url":"https://www.3gpp.org/dynareport/29510.htm","classifications":[],"lineage_layer":{"id":"core_protocol","label":"Core-network protocol & service realization","provenance_type":"inferred","review_state":"candidate","source_url":null,"note":"Orientation inferred from the 29-series; this is not an official 3GPP stage assignment."}},{"number":"29.518","type":"TS","title":"5G System; Access and Mobility Management Services; Stage 3","status":"Under change control","initial_release":"Rel-15","primary_group":"C4","portal_url":"https://portal.3gpp.org/desktopmodules/Specifications/SpecificationDetails.aspx?specificationId=3339","dynareport_url":"https://www.3gpp.org/dynareport/29518.htm","classifications":[],"lineage_layer":{"id":"core_protocol","label":"Core-network protocol & service realization","provenance_type":"inferred","review_state":"candidate","source_url":null,"note":"Orientation inferred from the 29-series; this is not an official 3GPP stage assignment."}}],"layers":[{"id":"architecture","label":"System architecture & procedures / Stage 2 orientation","specifications":[{"number":"23.501","type":"TS","title":"System architecture for the 5G System (5GS)","status":"Under change control","initial_release":"Rel-15","primary_group":"S2","portal_url":"https://portal.3gpp.org/desktopmodules/Specifications/SpecificationDetails.aspx?specificationId=3144","dynareport_url":"https://www.3gpp.org/dynareport/23501.htm","classifications":[],"lineage_layer":{"id":"architecture","label":"System architecture & procedures / Stage 2 orientation","provenance_type":"inferred","review_state":"candidate","source_url":null,"note":"Orientation inferred from the 23-series; this is not an official 3GPP stage assignment."}},{"number":"23.502","type":"TS","title":"Procedures for the 5G System (5GS)","status":"Under change control","initial_release":"Rel-15","primary_group":"S2","portal_url":"https://portal.3gpp.org/desktopmodules/Specifications/SpecificationDetails.aspx?specificationId=3145","dynareport_url":"https://www.3gpp.org/dynareport/23502.htm","classifications":[],"lineage_layer":{"id":"architecture","label":"System architecture & procedures / Stage 2 orientation","provenance_type":"inferred","review_state":"candidate","source_url":null,"note":"Orientation inferred from the 23-series; this is not an official 3GPP stage assignment."}}]},{"id":"core_protocol","label":"Core-network protocol & service realization","specifications":[{"number":"29.500","type":"TS","title":"5G System; Technical Realization of Service Based Architecture; Stage 3","status":"Under change control","initial_release":"Rel-15","primary_group":"C4","portal_url":"https://portal.3gpp.org/desktopmodules/Specifications/SpecificationDetails.aspx?specificationId=3338","dynareport_url":"https://www.3gpp.org/dynareport/29500.htm","classifications":[],"lineage_layer":{"id":"core_protocol","label":"Core-network protocol & service realization","provenance_type":"inferred","review_state":"candidate","source_url":null,"note":"Orientation inferred from the 29-series; this is not an official 3GPP stage assignment."}},{"number":"29.501","type":"TS","title":"5G System; Principles and Guidelines for Services Definition; Stage 3","status":"Under change control","initial_release":"Rel-15","primary_group":"C4","portal_url":"https://portal.3gpp.org/desktopmodules/Specifications/SpecificationDetails.aspx?specificationId=3341","dynareport_url":"https://www.3gpp.org/dynareport/29501.htm","classifications":[],"lineage_layer":{"id":"core_protocol","label":"Core-network protocol & service realization","provenance_type":"inferred","review_state":"candidate","source_url":null,"note":"Orientation inferred from the 29-series; this is not an official 3GPP stage assignment."}},{"number":"29.502","type":"TS","title":"5G System; Session Management Services; Stage 3","status":"Under change control","initial_release":"Rel-15","primary_group":"C4","portal_url":"https://portal.3gpp.org/desktopmodules/Specifications/SpecificationDetails.aspx?specificationId=3340","dynareport_url":"https://www.3gpp.org/dynareport/29502.htm","classifications":[],"lineage_layer":{"id":"core_protocol","label":"Core-network protocol & service realization","provenance_type":"inferred","review_state":"candidate","source_url":null,"note":"Orientation inferred from the 29-series; this is not an official 3GPP stage assignment."}},{"number":"29.503","type":"TS","title":"5G System; Unified Data Management Services; Stage 3","status":"Under change control","initial_release":"Rel-15","primary_group":"C4","portal_url":"https://portal.3gpp.org/desktopmodules/Specifications/SpecificationDetails.aspx?specificationId=3342","dynareport_url":"https://www.3gpp.org/dynareport/29503.htm","classifications":[],"lineage_layer":{"id":"core_protocol","label":"Core-network protocol & service realization","provenance_type":"inferred","review_state":"candidate","source_url":null,"note":"Orientation inferred from the 29-series; this is not an official 3GPP stage assignment."}},{"number":"29.509","type":"TS","title":"5G System; Authentication Server Services; Stage 3","status":"Under change control","initial_release":"Rel-15","primary_group":"C4","portal_url":"https://portal.3gpp.org/desktopmodules/Specifications/SpecificationDetails.aspx?specificationId=3343","dynareport_url":"https://www.3gpp.org/dynareport/29509.htm","classifications":[],"lineage_layer":{"id":"core_protocol","label":"Core-network protocol & service realization","provenance_type":"inferred","review_state":"candidate","source_url":null,"note":"Orientation inferred from the 29-series; this is not an official 3GPP stage assignment."}},{"number":"29.510","type":"TS","title":"5G System; Network function repository services; Stage 3","status":"Under change control","initial_release":"Rel-15","primary_group":"C4","portal_url":"https://portal.3gpp.org/desktopmodules/Specifications/SpecificationDetails.aspx?specificationId=3345","dynareport_url":"https://www.3gpp.org/dynareport/29510.htm","classifications":[],"lineage_layer":{"id":"core_protocol","label":"Core-network protocol & service realization","provenance_type":"inferred","review_state":"candidate","source_url":null,"note":"Orientation inferred from the 29-series; this is not an official 3GPP stage assignment."}},{"number":"29.518","type":"TS","title":"5G System; Access and Mobility Management Services; Stage 3","status":"Under change control","initial_release":"Rel-15","primary_group":"C4","portal_url":"https://portal.3gpp.org/desktopmodules/Specifications/SpecificationDetails.aspx?specificationId=3339","dynareport_url":"https://www.3gpp.org/dynareport/29518.htm","classifications":[],"lineage_layer":{"id":"core_protocol","label":"Core-network protocol & service realization","provenance_type":"inferred","review_state":"candidate","source_url":null,"note":"Orientation inferred from the 29-series; this is not an official 3GPP stage assignment."}}]}],"primary_work_item":null,"connected_work_items":[{"database_id":250240,"uid":60110,"acronym":"TEI7","effective_acronym":"TEI7","title":"(Small) Technical Enhancements and Improvements for Rel-7","release":"Rel-7","status":"Awaiting approval","responsible_groups":["RP"],"completion_rate":100.0,"latest_remark":"-","work_plan_synced_at":"2026-10-07T21:46:47.776701+00:00","source_url":"https://portal.3gpp.org/desktopmodules/WorkItem/WorkItemDetails.aspx?workitemId=60110","work_plan_source_url":"https://www.3gpp.org/ftp/Information/WORK_PLAN/Work_plan_3gpp_2026_09_28.xlsx","specifications":["29.518"],"specification_associations":[{"number":"29.518","association_sources":["crdb"],"association_status":"source_tracked"}],"lineage_scope":"connected_to_mapped_specification"}],"relationships":[{"id":1,"source_spec":"23.502","target_spec":"23.501","edge_type":"stage_realization_of","provenance_type":"curated","confidence":1.0,"review_state":"reviewed","source_url":"atlas://curated/dependency-edges","valid_from_release":null,"valid_to_release":null},{"id":5,"source_spec":"29.502","target_spec":"23.502","edge_type":"interface_specification","provenance_type":"curated","confidence":1.0,"review_state":"reviewed","source_url":"atlas://curated/dependency-edges","valid_from_release":null,"valid_to_release":null}],"change_requests":{"primary_work_item":[],"release_context":[]},"traceability_summary":{"mapped_specifications":9,"explicit_stage_classifications":0,"inferred_layer_orientations":9,"release_valid_relationships":2,"connected_work_items":1,"primary_work_item_crs":0,"release_context_crs":0},"limitations":["The reviewed topic-to-specification mapping is Atlas-curated and non-normative even when its source is an official 3GPP record.","When an explicit stage classification is unavailable, specification layers are inferred from the TS/TR series and are labelled inferred rather than presented as official 3GPP stage assignments.","Connected Work Items and release-context Change Requests share mapped specifications; only the topic source Work Item is treated as primary evidence for the reviewed topic mapping.","This is traceability evidence and navigation, not a clause-by-clause normative feature definition."]}