Release Rel-15
5G NRThe foundational 5G New Radio release, defining the NR air interface and 5G core.
Frozen 2018-06-1481 specifications in series 38
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 38.455
NG-RAN; NR Positioning Protocol A (NRPPa)
Architecture
Rel-15TS5G NRUpdated 2026-07-25
TS 38.460
NG-RAN; E1 general aspects and principles
Architecture
Rel-15TS5G NRUpdated 2026-07-25
TS 38.461
NG-RAN; E1 layer 1
Architecture
Rel-15TS5G NRUpdated 2026-07-25
TS 38.462
NG-RAN; E1 signalling transport
Architecture
Rel-15TS5G NRUpdated 2026-07-25
TS 38.463
NG-RAN; E1 Application Protocol (E1AP)
Architecture
Rel-15TS5G NRUpdated 2026-07-25
TS 38.470
NG-RAN; F1 general aspects and principles
Architecture
Rel-15TS5G NRUpdated 2026-07-25
TS 38.471
NG-RAN; F1 layer 1
Architecture
Rel-15TS5G NRUpdated 2026-07-25
TS 38.472
NG-RAN; F1 signalling transport
Architecture
Rel-15TS5G NRUpdated 2026-07-25
TS 38.473
NG-RAN; F1 Application Protocol (F1AP)
Protocol
Rel-15TS5G NRUpdated 2026-07-25
TS 38.474
NG-RAN; F1 data transport
Architecture
Rel-15TS5G NRUpdated 2026-07-25
TS 38.508-1
5GS; User Equipment (UE) conformance specification; Part 1: Common test environment
Architecture
Rel-15TS5G NRUpdated 2026-07-25
TS 38.508-2
5GS; User Equipment (UE) conformance specification; Part 2: Common Implementation Conformance Statement (ICS) proforma
Architecture
Rel-15TS5G NRUpdated 2026-07-25
TS 38.509
5GS; Special conformance testing functions for User Equipment (UE)
Architecture
Rel-15TS5G NRUpdated 2026-07-25
TS 38.521-1
NR; User Equipment (UE) conformance specification; Radio transmission and reception; Part 1: Range 1 standalone
Architecture
Rel-15TS5G NRUpdated 2026-07-25
TS 38.521-2
NR; User Equipment (UE) conformance specification; Radio transmission and reception; Part 2: Range 2 standalone
Architecture
Rel-15TS5G NRUpdated 2026-07-25
TS 38.521-3
NR; User Equipment (UE) conformance specification; Radio transmission and reception; Part 3: Range 1 and Range 2 Interworking operation with other radios
Architecture
Rel-15TS5G NRUpdated 2026-07-25
TS 38.521-4
NR; User Equipment (UE) conformance specification; Radio transmission and reception; Part 4: Performance
Architecture
Rel-15TS5G NRUpdated 2026-07-25
TS 38.522
NR; User Equipment (UE) conformance specification; Applicability of radio transmission, radio reception and radio resource management test cases
Architecture
Rel-15TS5G NRUpdated 2026-07-25
TS 38.523-1
5GS; User Equipment (UE) conformance specification; Part 1: Protocol
Architecture
Rel-15TS5G NRUpdated 2026-07-25
TS 38.523-2
5GS; User Equipment (UE) conformance specification; Part 2: Applicability of protocol test cases
Architecture
Rel-15TS5G NRUpdated 2026-07-25