TS and TR numbering, spec file formats, FTP directory structure, and accessing 3GPP specifications. Use when working with 3GPP specification numbering, finding spec files, or understanding spec directory organization.
3GPP specifications are the primary deliverables of the 3GPP partnership. They include:
21.456 (Series + Spec number)TR 21.900 (TR + number)Two-digit series number + Three-digit spec number:
<series>.<spec>
Examples:
Each two-digit series corresponds to a specific technical domain:
| Series | Domain | Responsible TSG |
|---|---|---|
| 21 | Requirements | SA |
| 22 | Service aspects ("stage 1") | SA1 |
| 23 | Technical realization ("stage 2") | SA2 |
| 24 | Signalling protocols ("stage 3") - UE to network | CT1 |
| 25 | Radio aspects (UTRA/UTRAN) | RAN |
| 26 | CODECs | SA4 |
| 27 | Data services | CT1 |
| 28 | Signalling protocols ("stage 3") - RSS-CN | CT4 |
| 29 | Signalling protocols ("stage 3") - Intra-CN | CT3/CT4 |
| 31 | UE terminal conformance (USIM) | CT6 |
| 32 | OAM&P and Charging | SA5 |
| 33 | Security | SA3 |
| 34 | UE and USIM test specifications | CT6/RAN5 |
| 35 | Security algorithms | SA3 |
| 36 | LTE (Evolved UTRA/E-UTRAN) | RAN |
| 37 | Multiple radio access technology aspects | RAN |
| 38 | 5G NR (New Radio) | RAN |
Key patterns:
.doc.zip