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 24.237
IP Multimedia (IM) Core Network (CN) subsystem IP Multimedia Subsystem (IMS) service continuity; Stage 3
Protocol
Rel-15TSIMSUpdated 2026-07-25
TS 24.238
Session Initiation Protocol (SIP) based user configuration; Stage 3
Protocol
Rel-15TSIMSUpdated 2026-07-25
TS 24.239
Flexible Alerting (FA) using IP Multimedia (IM) Core Network (CN) subsystem; Protocol specification
Protocol
Rel-15TSIMSUpdated 2026-07-25
TS 24.244
Wireless LAN control plane protocol for trusted WLAN access to EPC; Stage 3
Protocol
Rel-15TSIMSUpdated 2026-07-25
TS 24.247
Messaging service using the IP Multimedia (IM) Core Network (CN) subsystem; Stage 3
Protocol
Rel-15TSIMSUpdated 2026-07-25
TS 24.250
Protocol for Reliable Data Service; Stage 3
Protocol
Rel-15TSIMSUpdated 2026-07-25
TS 24.259
Personal Network Management (PNM); Stage 3
Protocol
Rel-15TSIMSUpdated 2026-07-25
TS 24.275
Management Object (MO) for Basic Communication Part (BCP) of IMS Multimedia Telephony (MMTEL) communication service
Protocol
Rel-15TSIMSUpdated 2026-07-25
TS 24.279
Combining Circuit Switched (CS) and IP Multimedia Subsystem (IMS) services; Stage 3
Protocol
Rel-15TSIMSUpdated 2026-07-25
TS 24.281
Mission Critical Video (MCVideo) signalling control; Protocol specification
Protocol
Rel-15TSIMSUpdated 2026-07-25
TS 24.282
Mission Critical Data (MCData) signalling control; Protocol specification
Protocol
Rel-15TSIMSUpdated 2026-07-25
TS 24.285
Allowed Closed Subscriber Group (CSG) list; Management Object (MO)
Protocol
Rel-15TSIMSUpdated 2026-07-25
TS 24.286
IP Multimedia (IM) Core Network (CN) subsystem Centralized Services (ICS); Management Object (MO)
Protocol
Rel-15TSIMSUpdated 2026-07-25
TS 24.292
IP Multimedia (IM) Core Network (CN) subsystem Centralized Services (ICS); Stage 3
Protocol
Rel-15TSIMSUpdated 2026-07-25
TS 24.294
IP Multimedia Subsystem (IMS) Centralized Services (ICS) protocol via I1 interface
Protocol
Rel-15TSIMSUpdated 2026-07-25
TS 24.301
Non-Access-Stratum (NAS) protocol for Evolved Packet System (EPS); Stage 3
Protocol
Rel-15TSIMSUpdated 2026-07-25
TS 24.302
Access to the 3GPP Evolved Packet Core (EPC) via non-3GPP access networks; Stage 3
Protocol
Rel-15TSIMSUpdated 2026-07-25
TS 24.303
Mobility management based on Dual-Stack Mobile IPv6; Stage 3
Protocol
Rel-15TSIMSUpdated 2026-07-25
TS 24.304
Mobility management based on Mobile IPv4; User Equipment (UE) - foreign agent interface; Stage 3
Protocol
Rel-15TSIMSUpdated 2026-07-25
TS 24.305
Selective Disabling of 3GPP User Equipment Capabilities (SDoUE) Management Object (MO)
Protocol
Rel-15TSIMSUpdated 2026-07-25