{"topic":{"id":"ran3","name":"RAN3 Architecture and Interfaces","summary":"NG-RAN control-plane architecture and the NG, Xn, F1, E1 and positioning interfaces maintained by RAN3.","facets":["NG-RAN","NGAP","XnAP","F1AP","E1AP","NRPPa"],"provenance_type":"curated","review_state":"reviewed","source_url":"https://www.3gpp.org/dynareport/38401.htm","valid_from_release":"Rel-15","valid_to_release":null},"release":"Rel-13","release_state":{"applicable":false,"note":"reviewed mapping begins in Rel-15"},"specifications":[{"number":"38.401","type":"TS","title":"NG-RAN; Architecture description","status":"Under change control","initial_release":"Rel-15","primary_group":"R3","portal_url":"https://portal.3gpp.org/desktopmodules/Specifications/SpecificationDetails.aspx?specificationId=3219","dynareport_url":"https://www.3gpp.org/dynareport/38401.htm","classifications":[],"lineage_layer":{"id":"ran_realization","label":"RAN / radio realization","provenance_type":"inferred","review_state":"candidate","source_url":null,"note":"Orientation inferred from the 38-series; 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this is not an official 3GPP stage assignment."}},{"number":"38.473","type":"TS","title":"NG-RAN; F1 Application Protocol (F1AP)","status":"Under change control","initial_release":"Rel-15","primary_group":"R3","portal_url":"https://portal.3gpp.org/desktopmodules/Specifications/SpecificationDetails.aspx?specificationId=3260","dynareport_url":"https://www.3gpp.org/dynareport/38473.htm","classifications":[],"lineage_layer":{"id":"ran_realization","label":"RAN / radio realization","provenance_type":"inferred","review_state":"candidate","source_url":null,"note":"Orientation inferred from the 38-series; this is not an official 3GPP stage assignment."}},{"number":"38.463","type":"TS","title":"NG-RAN; E1 Application Protocol (E1AP)","status":"Under change control","initial_release":"Rel-15","primary_group":"R3","portal_url":"https://portal.3gpp.org/desktopmodules/Specifications/SpecificationDetails.aspx?specificationId=3431","dynareport_url":"https://www.3gpp.org/dynareport/38463.htm","classifications":[],"lineage_layer":{"id":"ran_realization","label":"RAN / radio realization","provenance_type":"inferred","review_state":"candidate","source_url":null,"note":"Orientation inferred from the 38-series; this is not an official 3GPP stage assignment."}},{"number":"38.455","type":"TS","title":"NG-RAN; NR Positioning Protocol A (NRPPa)","status":"Under change control","initial_release":"Rel-15","primary_group":"R3","portal_url":"https://portal.3gpp.org/desktopmodules/Specifications/SpecificationDetails.aspx?specificationId=3256","dynareport_url":"https://www.3gpp.org/dynareport/38455.htm","classifications":[],"lineage_layer":{"id":"ran_realization","label":"RAN / radio realization","provenance_type":"inferred","review_state":"candidate","source_url":null,"note":"Orientation inferred from the 38-series; this is not an official 3GPP stage assignment."}}],"layers":[{"id":"ran_realization","label":"RAN / radio realization","specifications":[{"number":"38.401","type":"TS","title":"NG-RAN; Architecture description","status":"Under change control","initial_release":"Rel-15","primary_group":"R3","portal_url":"https://portal.3gpp.org/desktopmodules/Specifications/SpecificationDetails.aspx?specificationId=3219","dynareport_url":"https://www.3gpp.org/dynareport/38401.htm","classifications":[],"lineage_layer":{"id":"ran_realization","label":"RAN / radio realization","provenance_type":"inferred","review_state":"candidate","source_url":null,"note":"Orientation inferred from the 38-series; this is not an official 3GPP stage assignment."}},{"number":"38.413","type":"TS","title":"NG-RAN; NG Application Protocol (NGAP)","status":"Under change control","initial_release":"Rel-15","primary_group":"R3","portal_url":"https://portal.3gpp.org/desktopmodules/Specifications/SpecificationDetails.aspx?specificationId=3223","dynareport_url":"https://www.3gpp.org/dynareport/38413.htm","classifications":[],"lineage_layer":{"id":"ran_realization","label":"RAN / radio realization","provenance_type":"inferred","review_state":"candidate","source_url":null,"note":"Orientation inferred from the 38-series; this is not an official 3GPP stage assignment."}},{"number":"38.423","type":"TS","title":"NG-RAN; Xn Application Protocol (XnAP)","status":"Under change control","initial_release":"Rel-15","primary_group":"R3","portal_url":"https://portal.3gpp.org/desktopmodules/Specifications/SpecificationDetails.aspx?specificationId=3228","dynareport_url":"https://www.3gpp.org/dynareport/38423.htm","classifications":[],"lineage_layer":{"id":"ran_realization","label":"RAN / radio realization","provenance_type":"inferred","review_state":"candidate","source_url":null,"note":"Orientation inferred from the 38-series; this is not an official 3GPP stage assignment."}},{"number":"38.473","type":"TS","title":"NG-RAN; F1 Application Protocol (F1AP)","status":"Under change control","initial_release":"Rel-15","primary_group":"R3","portal_url":"https://portal.3gpp.org/desktopmodules/Specifications/SpecificationDetails.aspx?specificationId=3260","dynareport_url":"https://www.3gpp.org/dynareport/38473.htm","classifications":[],"lineage_layer":{"id":"ran_realization","label":"RAN / radio realization","provenance_type":"inferred","review_state":"candidate","source_url":null,"note":"Orientation inferred from the 38-series; this is not an official 3GPP stage assignment."}},{"number":"38.463","type":"TS","title":"NG-RAN; E1 Application Protocol (E1AP)","status":"Under change control","initial_release":"Rel-15","primary_group":"R3","portal_url":"https://portal.3gpp.org/desktopmodules/Specifications/SpecificationDetails.aspx?specificationId=3431","dynareport_url":"https://www.3gpp.org/dynareport/38463.htm","classifications":[],"lineage_layer":{"id":"ran_realization","label":"RAN / radio realization","provenance_type":"inferred","review_state":"candidate","source_url":null,"note":"Orientation inferred from the 38-series; this is not an official 3GPP stage assignment."}},{"number":"38.455","type":"TS","title":"NG-RAN; NR Positioning Protocol A (NRPPa)","status":"Under change control","initial_release":"Rel-15","primary_group":"R3","portal_url":"https://portal.3gpp.org/desktopmodules/Specifications/SpecificationDetails.aspx?specificationId=3256","dynareport_url":"https://www.3gpp.org/dynareport/38455.htm","classifications":[],"lineage_layer":{"id":"ran_realization","label":"RAN / radio realization","provenance_type":"inferred","review_state":"candidate","source_url":null,"note":"Orientation inferred from the 38-series; this is not an official 3GPP stage assignment."}}]}],"primary_work_item":null,"connected_work_items":[],"relationships":[{"id":6,"source_spec":"38.423","target_spec":"38.401","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},{"id":8,"source_spec":"38.455","target_spec":"38.401","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},{"id":7,"source_spec":"38.473","target_spec":"38.401","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":6,"explicit_stage_classifications":0,"inferred_layer_orientations":6,"release_valid_relationships":3,"connected_work_items":0,"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."]}