Release Rel-15
5G NRThe foundational 5G New Radio release, defining the NR air interface and 5G core.
Frozen 2018-06-14109 specifications in series 24
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 24.628
Common Basic Communication procedures using IP Multimedia (IM) Core Network (CN) subsystem; Protocol specification
Protocol
Rel-15TSIMSUpdated 2026-07-25
TS 24.629
Explicit Communication Transfer (ECT) using IP Multimedia (IM) Core Network (CN) subsystem; Protocol specification
Protocol
Rel-15TSIMSUpdated 2026-07-25
TS 24.642
Completion of Communications to Busy Subscriber (CCBS) and Completion of Communications by No Reply (CCNR) using IP Multimedia (IM) Core Network (CN) subsystem; Protocol specification
Protocol
Rel-15TSIMSUpdated 2026-07-25
TS 24.647
Advice Of Charge (AOC) using IP Multimedia (IM) Core Network (CN) subsystem
Protocol
Rel-15TSIMSUpdated 2026-07-25
TS 24.654
Closed User Group (CUG) using IP Multimedia (IM) Core Network (CN) subsystem, Protocol Specification
Protocol
Rel-15TSIMSUpdated 2026-07-25
TS 24.890
CT WG1 aspects of 5G; System Phase 1
Protocol
Rel-15TSIMSUpdated 2026-07-25
TS 24.930
Signalling flows for the session setup in the IP Multimedia core network Subsystem (IMS) based on Session Initiation Protocol (SIP) and Session Description Protocol (SDP); Stage 3
Protocol
Rel-15TSIMSUpdated 2026-07-25
TS 24.969
Business trunking; Next Generation Corporate Network (NGCN) - Next Generation Network (NGN) interfaces implementation guide
Protocol
Rel-15TSIMSUpdated 2026-07-25
TS 24.980
Minimum requirements for support of MCPTT service over the Gm reference point
Protocol
Rel-15TSIMSUpdated 2026-07-25