{"topic":{"id":"positioning","name":"Positioning","summary":"Location services, LPP and NR positioning protocol relationships.","facets":["LCS","LPP","NRPPa","RRC"],"provenance_type":"curated","review_state":"reviewed","source_url":"https://portal.3gpp.org/desktopmodules/Specifications/SpecificationDetails.aspx?specificationId=3577","valid_from_release":"Rel-16","valid_to_release":null},"release":"Rel-12","release_state":{"applicable":false,"note":"reviewed mapping begins in Rel-16"},"specifications":[{"number":"23.273","type":"TS","title":"5G System (5GS) Location Services (LCS); Stage 2","status":"Under change control","initial_release":"Rel-16","primary_group":"S2","portal_url":"https://portal.3gpp.org/desktopmodules/Specifications/SpecificationDetails.aspx?specificationId=3577","dynareport_url":"https://www.3gpp.org/dynareport/23273.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":"37.355","type":"TS","title":"LTE Positioning Protocol (LPP)","status":"Under change control","initial_release":"Rel-15","primary_group":"R2","portal_url":"https://portal.3gpp.org/desktopmodules/Specifications/SpecificationDetails.aspx?specificationId=3710","dynareport_url":"https://www.3gpp.org/dynareport/37355.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 37-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."}},{"number":"38.331","type":"TS","title":"NR; Radio Resource Control (RRC); Protocol specification","status":"Under change control","initial_release":"Rel-15","primary_group":"R2","portal_url":"https://portal.3gpp.org/desktopmodules/Specifications/SpecificationDetails.aspx?specificationId=3197","dynareport_url":"https://www.3gpp.org/dynareport/38331.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":"architecture","label":"System architecture & procedures / Stage 2 orientation","specifications":[{"number":"23.273","type":"TS","title":"5G System (5GS) Location Services (LCS); Stage 2","status":"Under change control","initial_release":"Rel-16","primary_group":"S2","portal_url":"https://portal.3gpp.org/desktopmodules/Specifications/SpecificationDetails.aspx?specificationId=3577","dynareport_url":"https://www.3gpp.org/dynareport/23273.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":"ran_realization","label":"RAN / radio realization","specifications":[{"number":"37.355","type":"TS","title":"LTE Positioning Protocol (LPP)","status":"Under change control","initial_release":"Rel-15","primary_group":"R2","portal_url":"https://portal.3gpp.org/desktopmodules/Specifications/SpecificationDetails.aspx?specificationId=3710","dynareport_url":"https://www.3gpp.org/dynareport/37355.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 37-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."}},{"number":"38.331","type":"TS","title":"NR; Radio Resource Control (RRC); Protocol specification","status":"Under change control","initial_release":"Rel-15","primary_group":"R2","portal_url":"https://portal.3gpp.org/desktopmodules/Specifications/SpecificationDetails.aspx?specificationId=3197","dynareport_url":"https://www.3gpp.org/dynareport/38331.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":[{"database_id":247742,"uid":590319,"acronym":"LCS_BDS-LTE-Core","effective_acronym":"LCS_BDS-LTE-Core","title":"Core part: Support for BeiDou Navigation Satellite System (BDS) for LTE","release":"Rel-12","status":"PCG approved","responsible_groups":["R2"],"completion_rate":100.0,"latest_remark":"RP-131525","work_plan_synced_at":"2026-10-07T21:46:46.325441+00:00","source_url":"https://portal.3gpp.org/desktopmodules/WorkItem/WorkItemDetails.aspx?workitemId=590319","work_plan_source_url":"https://www.3gpp.org/ftp/Information/WORK_PLAN/Work_plan_3gpp_2026_09_28.xlsx","specifications":["37.355"],"specification_associations":[{"number":"37.355","association_sources":["crdb"],"association_status":"source_tracked"}],"lineage_scope":"connected_to_mapped_specification"},{"database_id":249202,"uid":420006,"acronym":"LCS_LTE","effective_acronym":"LCS_LTE","title":"Positioning Support for LTE","release":"Rel-9","status":"PCG approved","responsible_groups":["R1"],"completion_rate":100.0,"latest_remark":"RP-100442","work_plan_synced_at":"2026-10-07T21:46:47.138205+00:00","source_url":"https://portal.3gpp.org/desktopmodules/WorkItem/WorkItemDetails.aspx?workitemId=420006","work_plan_source_url":"https://www.3gpp.org/ftp/Information/WORK_PLAN/Work_plan_3gpp_2026_09_28.xlsx","specifications":["37.355"],"specification_associations":[{"number":"37.355","association_sources":["crdb"],"association_status":"source_tracked"}],"lineage_scope":"connected_to_mapped_specification"}],"relationships":[],"change_requests":{"primary_work_item":[],"release_context":[]},"traceability_summary":{"mapped_specifications":4,"explicit_stage_classifications":0,"inferred_layer_orientations":4,"release_valid_relationships":0,"connected_work_items":2,"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."]}