Release Rel-15
5G NRThe foundational 5G New Radio release, defining the NR air interface and 5G core.
Frozen 2018-06-141,188 specifications
Key features: First 5G NR specifications, NSA and SA architectures
All SeriesSeries 21Series 22Series 23Series 24Series 26Series 27Series 28Series 29Series 31Series 32Series 33Series 34Series 35Series 36Series 37Series 38
TS 23.214
Architecture enhancements for control and user plane separation of EPC nodes
Physical Layer
Rel-15TS5GCUpdated 2026-07-25
TS 23.216
Single Radio Voice Call Continuity (SRVCC); Stage 2
Architecture
Rel-15TS5GCUpdated 2026-07-25
TS 23.218
IP Multimedia (IM) session handling; IM call model; Stage 2
Architecture
Rel-15TS5GCUpdated 2026-07-25
TS 23.221
Architectural requirements
Architecture
Rel-15TS5GCUpdated 2026-07-25
TS 23.222
Common API Framework for 3GPP Northbound APIs
Architecture
Rel-15TS5GCUpdated 2026-07-25
TS 23.226
Global text telephony (GTT); Stage 2
Architecture
Rel-15TS5GCUpdated 2026-07-25
TS 23.228
IP Multimedia Subsystem (IMS); Stage 2
Architecture
Rel-15TS5GCUpdated 2026-07-25
TS 23.231
SIP-I based circuit-switched core network; Stage 2
Architecture
Rel-15TS5GCUpdated 2026-07-25
TS 23.236
Intra-domain connection of Radio Access Network (RAN) nodes to multiple Core Network (CN) nodes
Architecture
Rel-15TS5GCUpdated 2026-07-25
TS 23.237
IP Multimedia Subsystem (IMS) Service Continuity; Stage 2
Architecture
Rel-15TS5GCUpdated 2026-07-25
TS 23.240
3GPP Generic User Profile (GUP); Architecture (Stage 2)
Architecture
Rel-15TS5GCUpdated 2026-07-25
TS 23.246
Multimedia Broadcast/Multicast Service (MBMS); Architecture and functional description
Architecture
Rel-15TS5GCUpdated 2026-07-25
TS 23.251
Network sharing; Architecture and functional description
Architecture
Rel-15TS5GCUpdated 2026-07-25
TS 23.259
Personal Network Management (PNM); Procedures and information flows; Stage 2
Architecture
Rel-15TS5GCUpdated 2026-07-25
TS 23.261
IP flow mobility and seamless Wireless Local Area Network (WLAN) offload; Stage 2
Architecture
Rel-15TS5GCUpdated 2026-07-25
TS 23.271
Functional stage 2 description of Location Services (LCS)
Architecture
Rel-15TS5GCUpdated 2026-07-25
TS 23.272
Circuit Switched (CS) fallback in Evolved Packet System (EPS); Stage 2
Architecture
Rel-15TS5GCUpdated 2026-07-25
TS 23.278
Customised Applications for Mobile network Enhanced Logic (CAMEL) Phase 4; Stage 2; IM CN Interworking
Architecture
Rel-15TS5GCUpdated 2026-07-25
TS 23.279
Combining Circuit Switched (CS) and IP Multimedia Subsystem (IMS) services; Stage 2
Architecture
Rel-15TS5GCUpdated 2026-07-25
TS 23.280
Common functional architecture to support mission critical services; Stage 2
Architecture
Rel-15TS5GCUpdated 2026-07-25