Release Rel-15
5G NRThe foundational 5G New Radio release, defining the NR air interface and 5G core.
Frozen 2018-06-14118 specifications in series 23
Key features: First 5G NR specifications, NSA and SA architectures
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TS 23.729
Study on unlicensed spectrum offloading system enhancements
Architecture
Rel-15TS5GCUpdated 2026-07-25
TS 23.733
Study on architecture enhancements to Proximity Services (ProSe) UE-to-Network relay
Architecture
Rel-15TS5GCUpdated 2026-07-25
TS 23.751
Study on support of voice over WLAN
Architecture
Rel-15TS5GCUpdated 2026-07-25
TS 23.759
Study for enhanced Voice Over LTE (VoLTE) Performance
Architecture
Rel-15TS5GCUpdated 2026-07-25
TS 23.781
Study on migration and interconnection for mission critical services
Architecture
Rel-15TS5GCUpdated 2026-07-25
TS 23.782
Study on mission critical communication interworking between LTE and non-LTE systems
Architecture
Rel-15TS5GCUpdated 2026-07-25
TS 23.790
Study on application architecture for the Future Railway Mobile Communication System (FRMCS); Stage 2
Architecture
Rel-15TS5GCUpdated 2026-07-25
TS 23.792
Study on MBMS APIs for Mission Critical Services
Architecture
Rel-15TS5GCUpdated 2026-07-25
TS 23.795
Study on application layer support for V2X services
Architecture
Rel-15TS5GCUpdated 2026-07-25
TS 23.798
Study on Isolated E-UTRAN Operation for Public Safety; Enhancements
Architecture
Rel-15TS5GCUpdated 2026-07-25
TS 23.903
Redial solution for voice-video switching
Architecture
Rel-15TS5GCUpdated 2026-07-25
TS 23.919
Direct tunnel deployment guideline
Architecture
Rel-15TS5GCUpdated 2026-07-25
TS 23.924
Feasibility study on Non-Access Stratum (NAS) node selection function above Base Station Controller (BSC) / Radio Network Controller (RNC)
Architecture
Rel-15TS5GCUpdated 2026-07-25
TS 23.975
IPv6 migration guidelines
Architecture
Rel-15TS5GCUpdated 2026-07-25
TS 23.976
Push architecture
Architecture
Rel-15TS5GCUpdated 2026-07-25
TS 23.977
Bandwidth And Resource Savings (BARS) and speech enhancements for Circuit Switched (CS) networks
Architecture
Rel-15TS5GCUpdated 2026-07-25
TS 23.979
3GPP enablers for Open Mobile Alliance (OMA); Push-to-talk over Cellular (PoC) services; Stage 2
Architecture
Rel-15TS5GCUpdated 2026-07-25
TS 23.981
Interworking aspects and migration scenarios for IPv4-based IP Multimedia Subsystem (IMS) implementations
Architecture
Rel-15TS5GCUpdated 2026-07-25