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-21 CR context0
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.
NR_AIML_air_Ph2Rel-20 · connected · 32%
3GPP ↗NR_AIML_air_Ph2-CoreRel-20 · connected · 67%
3GPP ↗NR_Mob_Ph5Rel-20 · connected · 26%
3GPP ↗TEI20Rel-20 · connected · 0%
3GPP ↗AIML_CNRel-19 · connected · 100%
3GPP ↗AIML_CNRel-19 · connected · 100%
3GPP ↗HPUE_NR_FR1_bands_R19-CoreRel-19 · connected · 100%
3GPP ↗LCS_BDS_B2b_LTE_NRRel-19 · connected · 100%
3GPP ↗LCS_BDS_B2b_LTE_NR-CoreRel-19 · connected · 100%
3GPP ↗LCS_NAVIC_L1_SPS_NR_LTE-CoreRel-19 · connected · 100%
3GPP ↗NR_AIML_airRel-19 · connected · 89%
3GPP ↗NR_AIML_air-CoreRel-19 · connected · 100%
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-21 context
CR activity across mapped specs
Context only: these CRs target mapped specifications in Rel-21; they are not automatically attributed to the feature.
No CR activity targeting the mapped specifications is indexed for Rel-21.
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 22.101
Service aspects; Service principles
S1 · Rel-4inferredrank 175moderate evidence
TS 22.011
Service accessibility
S1 · Rel-4inferredrank 150moderate evidence
TS 22.268
Public Warning System (PWS) requirements
S1 · Rel-9inferredrank 150moderate evidence
TS 22.173
IP Multimedia Core Network Subsystem (IMS) Multimedia Telephony Service and supplementary services; Stage 1
S1 · Rel-7inferredrank 125moderate evidence
TS 22.280
Mission Critical Services Common Requirements (MCCoRe); Stage 1
S1 · Rel-14inferredrank 100moderate evidence
TS 22.228
Service requirements for the Internet Protocol (IP) multimedia core network subsystem (IMS); Stage 1
S1 · Rel-5inferredrank 75moderate evidence
TS 22.179
Mission Critical Push to Talk (MCPTT); Stage 1
S1 · Rel-13inferredrank 25moderate 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.