Layer 1
Core-network protocol & service realization
TS 29.281
General Packet Radio System (GPRS) Tunnelling Protocol User Plane (GTPv1-U)
C4 · Rel-8inferredOrientation inferred from the 29-series; this is not an official 3GPP stage assignment.
curatedreviewedreviewed from Rel-15
Feature lineage · NG-RAN Functional Split
gNB-CU-CP, gNB-CU-UP and gNB-DU architecture with F1 and E1 control relationships.
Mapped specs4
Explicit stage labels0
Inferred orientations4
Relationships2
Connected WIs100
Rel-18 CR context50
1 spec
Layer 2
RAN / radio realization
TS 38.401
NG-RAN; Architecture description
R3 · Rel-15inferredOrientation inferred from the 38-series; this is not an official 3GPP stage assignment.
TS 38.473
NG-RAN; F1 Application Protocol (F1AP)
R3 · Rel-15inferredOrientation inferred from the 38-series; this is not an official 3GPP stage assignment.
TS 38.463
NG-RAN; E1 Application Protocol (E1AP)
R3 · 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_NGRAN-CoreRel-18 · connected · 80%
3GPP ↗NR_ATG-CoreRel-18 · connected · 100%
3GPP ↗NR_DualTxRx_MUSIM-CoreRel-18 · connected · 100%
3GPP ↗NR_ENDC_SON_MDT_enh2-CoreRel-18 · connected · 100%
3GPP ↗NR_FR1_lessthan_5MHz_BW-CoreRel-18 · connected · 100%
3GPP ↗NR_MBS_enhRel-18 · connected · 100%
3GPP ↗NR_MBS_enh-CoreRel-18 · connected · 100%
3GPP ↗NR_MG_enh2-CoreRel-18 · connected · 100%
3GPP ↗NR_MT_SDTRel-18 · connected · 100%
3GPP ↗NR_MT_SDT-CoreRel-18 · connected · 100%
3GPP ↗NR_Mob_enh2Rel-18 · connected · 100%
3GPP ↗NR_Mob_enh2-CoreRel-18 · connected · 100%
3GPP ↗Cross-spec traceability
Release-valid relationships
38.473interface specification38.401curatedreviewed
38.463interface specification38.401curatedreviewedevidence ↗
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.
38.401 · CR 0265 rev.11
Support of AI/ML in NG-RAN in the case of split architecture
reissued3GPP CR ↗29.281 · CR 0125
Adding W1-U interface
approved3GPP CR ↗38.401 · CR 0302 rev.3
Support of oversize UL SDT Data Arrival [Large SDT Uplink Data]
approved3GPP CR ↗38.473 · CR 1213 rev.3
Switching from SDT to RRC Connected State [Large SDT Uplink Data]
approved3GPP CR ↗38.473 · CR 1194 rev.2
Introduction of measurements without gap with interruption
approved3GPP CR ↗38.473 · CR 1221 rev.2
Introduction of 3 MHz channel bandwidth
approved3GPP CR ↗38.473 · CR 1167 rev.3
Support 1-symbol PRS [1symbol_PRS]
approved3GPP CR ↗38.473 · CR 1232 rev.1
Introduction of early capability restriction for Multi-SIM
approved3GPP CR ↗38.473 · CR 1140 rev.8
Introduction on MT-SDT
approved3GPP CR ↗38.401 · CR 0284 rev.8
Introduction on MT-SDT
approved3GPP CR ↗38.401 · CR 0274 rev.7
Support of Network-Controlled Repeater
approved3GPP CR ↗38.473 · CR 1109 rev.7
Support of Network-Controlled Repeater
approved3GPP CR ↗38.473 · CR 1248 rev.1
Introduction of SL CA over F1 interface
approved3GPP CR ↗38.473 · CR 1231 rev.2
Introduction of RedCap UE MBS Broadcast reception [RedcapMBS]
approved3GPP CR ↗38.473 · CR 1129 rev.11
Introduction of Network Energy Saving
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 38.423
NG-RAN; Xn Application Protocol (XnAP)
R3 · Rel-15inferredrank 1865strong evidence
graph adjacency
interface_specification with mapped TS/TR 38.401
TS 38.300
NR; NR and NG-RAN Overall description; Stage-2
R2 · Rel-15inferredrank 1775moderate evidence
TS 38.331
NR; Radio Resource Control (RRC); Protocol specification
R2 · Rel-15inferredrank 1775moderate evidence
TS 38.413
NG-RAN; NG Application Protocol (NGAP)
R3 · Rel-15inferredrank 1750moderate evidence
TS 38.306
NR; User Equipment (UE) radio access capabilities
R2 · Rel-15inferredrank 1675moderate evidence
TS 38.133
NR; Requirements for support of radio resource management
R4 · Rel-15inferredrank 1300moderate evidence
TS 38.321
NR; Medium Access Control (MAC) protocol specification
R2 · Rel-15inferredrank 1200moderate evidence
TS 36.331
Evolved Universal Terrestrial Radio Access (E-UTRA); Radio Resource Control (RRC); Protocol specification
R2 · Rel-8inferredrank 1150moderate evidence
TS 38.470
NG-RAN; F1 general aspects and principles
R3 · Rel-15inferredrank 1100moderate evidence
TS 29.274
3GPP Evolved Packet System (EPS); Evolved General Packet Radio Service (GPRS) Tunnelling Protocol for Control plane (GTPv2-C); Stage 3
C4 · Rel-8inferredrank 1000moderate evidence
TS 36.423
Evolved Universal Terrestrial Radio Access Network (E-UTRAN); X2 Application Protocol (X2AP)
R3 · Rel-8inferredrank 950moderate evidence
TS 38.214
NR; Physical layer procedures for data
R1 · Rel-15inferredrank 925moderate 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.