3GPP Atlas

Standards traceability

Feature lineage

Follow a reviewed Atlas topic through its mapped specifications, primary Work Item evidence, release-valid relationships and Change Request activity.

Evidence model: topic mappings remain Atlas-curated. Where no explicit stage classification exists, Atlas shows a clearly-labelled series-based orientation rather than presenting it as an official 3GPP Stage assignment.

curatedavailable from Rel-17

Non-Terrestrial Networks

Satellite and other non-terrestrial access integrated with NR and 5GS.

6 mapped specsoutside lens
curatedavailable from Rel-15

Network Slicing

Slice selection, architecture, policy and UE/core signalling.

5 mapped specsoutside lens
curatedavailable from Rel-16

Positioning

Location services, LPP and NR positioning protocol relationships.

4 mapped specsoutside lens
curatedavailable from Rel-16

AI / ML and Analytics

Analytics and AI/ML-related system functions, including NWDAF.

3 mapped specsoutside lens
curatedavailable from Rel-17

Reduced Capability (RedCap)

NR reduced-capability device support across radio architecture and protocol layers.

4 mapped specsoutside lens
curatedavailable from Rel-18

XR / Immersive Media

Extended-reality service requirements, media and QoS context.

4 mapped specsoutside lens
curatedavailable from Rel-15

5GS Registration

Registration state, NAS signalling, NGAP context and authentication across UE, NG-RAN and 5GC.

6 mapped specsoutside lens
curatedavailable from Rel-15

5GS Session Management

PDU Session lifecycle, policy/QoS, SMF services and user-plane realization.

7 mapped specsoutside lens
curatedavailable from Rel-15

5GS Mobility

Mobility architecture and procedures spanning NAS, RRC, NGAP and XnAP.

7 mapped specsoutside lens
curatedavailable from Rel-15

5GS QoS

5GS QoS flows, policy, session management and radio-resource realization.

7 mapped specsoutside lens
curatedavailable from Rel-15

RAN3 Architecture and Interfaces

NG-RAN control-plane architecture and the NG, Xn, F1, E1 and positioning interfaces maintained by RAN3.

6 mapped specsoutside lens
curatedavailable from Rel-15

NG-RAN Functional Split

gNB-CU-CP, gNB-CU-UP and gNB-DU architecture with F1 and E1 control relationships.

4 mapped specsoutside lens
curatedavailable from Rel-15

5GS Authentication and Security

5GS authentication, key/security context architecture and the AUSF service realization.

5 mapped specsoutside lens
curatedavailable from Rel-15

5GC Service-Based Architecture

Stage-3 service APIs and discovery for AMF, SMF, UDM, AUSF and NRF.

9 mapped specsoutside lens