Layer 1
System architecture & procedures / Stage 2 orientation
TS 23.273
5G System (5GS) Location Services (LCS); Stage 2
S2 · Rel-16inferredOrientation inferred from the 23-series; this is not an official 3GPP stage assignment.
curatedreviewedreviewed from Rel-16
Feature lineage · Positioning
Location services, LPP and NR positioning protocol relationships.
Mapped specs4
Explicit stage labels0
Inferred orientations4
Relationships2
Connected WIs100
Rel-18 CR context50
1 spec
Layer 2
RAN / radio realization
TS 37.355
LTE Positioning Protocol (LPP)
R2 · Rel-15inferredOrientation inferred from the 37-series; this is not an official 3GPP stage assignment.
TS 38.455
NG-RAN; NR Positioning Protocol A (NRPPa)
R3 · Rel-15inferredOrientation inferred from the 38-series; this is not an official 3GPP stage assignment.
TS 38.331
NR; Radio Resource Control (RRC); Protocol specification
R2 · Rel-15inferredOrientation inferred from the 38-series; this is not an official 3GPP stage assignment.
Primary feature evidence
Topic source Work Item
The reviewed topic source is not an indexed Work Item record. The source link above remains the primary evidence anchor.
Connected work
Work Items touching mapped specs
These Work Items share one or more mapped specifications. Atlas does not automatically claim that every connected Work Item defines this feature.
4Rx_low_NR_band_handheld_3Tx_NR_CA_ENDCRel-18 · connected · 100%
3GPP ↗4Rx_low_NR_band_handheld_3Tx_NR_CA_ENDC-CoreRel-18 · connected · 100%
3GPP ↗5G_ProSe_Ph2Rel-18 · connected · 100%
3GPP ↗5G_eLCS_Ph3Rel-18 · connected · 100%
3GPP ↗5G_eLCS_Ph3Rel-18 · connected · 100%
3GPP ↗FS_eLCS_Ph3Rel-18 · connected · 100%
3GPP ↗LTE_UAV_enh-CoreRel-18 · connected · 100%
3GPP ↗NR_ATGRel-18 · connected · 98%
3GPP ↗NR_ATG-CoreRel-18 · connected · 100%
3GPP ↗NR_BWP_worRel-18 · connected · 100%
3GPP ↗NR_BWP_wor-CoreRel-18 · connected · 100%
3GPP ↗NR_DSS_enhRel-18 · connected · 87%
3GPP ↗Cross-spec traceability
Release-valid relationships
38.455positioning signalling for23.273curatedreviewedevidence ↗
37.355positioning protocol for23.273curatedreviewedevidence ↗
Primary WI evolution
Change Requests linked to the primary Work Item
No indexed CRs are linked to the primary Work Item at or before this release.
Rel-18 context
CR activity across mapped specs
Context only: these CRs target mapped specifications in Rel-18; they are not automatically attributed to the feature.
38.331 · CR 4510
Introduction of Rel-18 UE capabilities
not pursued3GPP CR ↗38.455 · CR 0109 rev.3
Support of Inactive positioning in SDT without UE context relocation case [POS_SDT]
approved3GPP CR ↗38.455 · CR 0102 rev.3
Support 1-symbol PRS [1symbol_PRS]
approved3GPP CR ↗38.331 · CR 4405
Introduction of R18 eNPN for TS 38.331
approved3GPP CR ↗38.331 · CR 4194 rev.3
Introduction of MT-SDT
approved3GPP CR ↗38.331 · CR 4123 rev.1
RedCap CFR for MBS broadcast [RedCapMBS_Bcast]
approved3GPP CR ↗37.355 · CR 0437 rev.4
Introduction of 1-symbol PRS in 37.355[1symbol_PRS]
approved3GPP CR ↗38.331 · CR 4014 rev.4
Introduction of 1-symbol PRS in 38.331[1symbol_PRS]
approved3GPP CR ↗37.355 · CR 0447 rev.1
Support of Local Cartesian Coordinates in LPP [PosLocalCoords]
approved3GPP CR ↗38.331 · CR 4360 rev.3
Introduction of R18 DSS
approved3GPP CR ↗38.331 · CR 4296 rev.2
SSR Satellite PCV Residuals [Rel18PCV]
approved3GPP CR ↗37.355 · CR 0465 rev.2
SSR Satellite PCV Residuals [Rel18PCV]
approved3GPP CR ↗38.331 · CR 4164 rev.5
Introduction of In-Device Co-existence (IDC) enhancements for NR
approved3GPP CR ↗38.331 · CR 4501 rev.1
Introduction of Rel-18 NR NTN enhancements
approved3GPP CR ↗37.355 · CR 0482 rev.1
Introduction of network verification of UE location in TS 37.355
approved3GPP CR ↗Candidate expansion · review required
Specifications Atlas may be missing from this topic
Inferred only. These records are not part of the reviewed semantic catalogue. The ranking score orders structural evidence; it is not a probability or confidence value, and there is no automatic promotion action.
TS 38.306
NR; User Equipment (UE) radio access capabilities
R2 · Rel-15inferredrank 3600moderate evidence
shared work item
Shares Work Item NR_SAR_PC2_interB_SUL_2BUL-Core with mapped specifications
evidence ↗shared work item
Shares Work Item 4Rx_low_NR_band_handheld_3Tx_NR_CA_ENDC with mapped specifications
evidence ↗shared work item
Shares Work Item 4Rx_low_NR_band_handheld_3Tx_NR_CA_ENDC-Core with mapped specifications
evidence ↗TS 38.300
NR; NR and NG-RAN Overall description; Stage-2
R2 · Rel-15inferredrank 2465strong evidence
graph adjacency
procedure_component with mapped TS/TR 38.331
TS 38.133
NR; Requirements for support of radio resource management
R4 · Rel-15inferredrank 2175moderate evidence
TS 38.473
NG-RAN; F1 Application Protocol (F1AP)
R3 · Rel-15inferredrank 1775moderate evidence
TS 38.321
NR; Medium Access Control (MAC) protocol specification
R2 · Rel-15inferredrank 1700moderate evidence
TS 38.423
NG-RAN; Xn Application Protocol (XnAP)
R3 · Rel-15inferredrank 1600moderate evidence
TS 38.101-1
NR; User Equipment (UE) radio transmission and reception; Part 1: Range 1 Standalone
R4 · Rel-15inferredrank 1525moderate evidence
shared work item
Shares Work Item NR_SAR_PC2_interB_SUL_2BUL-Core with mapped specifications
evidence ↗shared work item
Shares Work Item 4Rx_low_NR_band_handheld_3Tx_NR_CA_ENDC with mapped specifications
evidence ↗shared work item
Shares Work Item 4Rx_low_NR_band_handheld_3Tx_NR_CA_ENDC-Core with mapped specifications
evidence ↗TS 36.331
Evolved Universal Terrestrial Radio Access (E-UTRA); Radio Resource Control (RRC); Protocol specification
R2 · Rel-8inferredrank 1425moderate evidence
TS 38.413
NG-RAN; NG Application Protocol (NGAP)
R3 · Rel-15inferredrank 1425moderate evidence
TS 38.214
NR; Physical layer procedures for data
R1 · Rel-15inferredrank 1350moderate evidence
TS 38.213
NR; Physical layer procedures for control
R1 · Rel-15inferredrank 1200moderate evidence
TR 38.822
NR; User Equipment (UE) feature list
R2 · Rel-15inferredrank 1075moderate evidence
Traceability limits
What this lineage is not claiming
- 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.