3gpp-specifications

name	3gpp-specifications
description	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

Overview

3GPP specifications are the primary deliverables of the 3GPP partnership. They include:

• Technical Specifications (TS) - Normative technical documents
• Technical Reports (TR) - Informative studies and reports

TS vs TR Distinction

TS (Technical Specification)

• Purpose: Define requirements, protocols, and interfaces
• Status: Can be revised via Change Requests (CRs)
• Format: Word™ (.doc) and Zip™ archives
• Numbering: 21.456 (Series + Spec number)
• Authority: Produced by WG or TSG

TR (Technical Report)

• Purpose: Informative studies, analysis, or background information
• Status: Fixed at publication, can be revised via CRs
• Format: Word™ (.doc) and Zip™ archives
• Numbering: TR 21.900 (TR + number)
• Authority: Produced by WG or TSG

Numbering Scheme

Format

Two-digit series number + Three-digit spec number:

<series>.<spec>

Examples:

• TS 21.456 - Series 21, spec 456
• TS 22.101 - Series 22, spec 101
• TR 21.900 - Technical Report 21, number 900

Specification Series Meanings

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:

• Series 21-24: Core requirements, services, architecture, signalling
• Series 25, 36-38: Radio technologies (UTRA → LTE → NR)
• Series 31-35: Security and terminal testing
• Series 26, 32: Media codecs and network management

Document Type Prefixes

• TS: Technical Specifications (normative)
• TR: Technical Reports (informative)

Spec File Formats

Word™ Format

• Purpose: Formal specification document for review and change
• Extension: .doc
• Structure: Can include revision marks ("Track Changes")

Zip™ Format

• Purpose: Archive format for distribution
• Extension: .zip
• Contents: Word™ .doc files and additional resources

FTP Directory Structure

Root Directory

https://www.3gpp.org/ftp/Specs/<YYYY>-<MM>/

TSG Round Examples:

• RAN#110: https://www.3gpp.org/ftp/Specs/2025-12/
• SA#110: https://www.3gpp.org/ftp/Specs/2025-12/
• CT#110: https://www.3gpp.org/ftp/Specs/2025-12/SpecslistexTSG/TSG110.htm

Directory Contents

Each TSG round directory contains:

• HTML index pages (SpecslistexTSG/TSG#>.htm)
• Individual spec files (.doc, .zip)
• Delta directories for parallel releases (e.g., 21.101d)
• CR database and work item references

Spec Categories

Major Categories

• GSM (including GPRS and EDGE)
• W-CDMA (including HSPA)
• LTE (including LTE-Advanced and LTE-Advanced Pro)
• 5G (including 5G NR Standalone)

Spec Numbering Pattern

When a new spec is created:

1. Allocated next sequential spec number
2. Example: If last spec in series 21 is 21.456, next is 21.457
3. Continues until end of series or major release change

Example:

Series 21: 21.001, 21.002, 21.003, ..., 21.456
Series 22: 22.001, 22.002, 22.003, ..., 22.101

Spec Files

File Naming Convention

Spec files follow 3GPP naming conventions:

• Series number and spec number
• Type identifier (TS/TR if applicable)
• Version number (for revised versions)
• Language code (if multilingual)

Example:

• 21.456.doc - TS 21.456 Word™ document
• 21.456.zip - Zip™ archive containing Word™ files
• 21.456_003.doc - Version 003 revision

Working Groups and Specs

Working Group Responsibility

Each Working Group is responsible for specifications in their domain:

• RAN: Radio access technologies
• SA: System architecture and services
• CT: Core network and terminals

Spec Assignment

Specs are assigned to Working Groups based on their scope:

• Technical specs typically belong to specific WGs
• TSG plenaries approve specs for all TSGs

Release Management

MCC (Mobile Competence Centre)

The MCC aims to make all specs available following TSG round as soon as possible.

Target Dates

• Standard: 4 weeks after TSG plenary
• Extra time: Additional week for large volumes or holiday periods

Version Control

Spec Versions

• Initial version: When first published as TS/TR
• Revisions: Numbered versions created via Change Requests
• Dot notation: Decimal numbering (e.g., 21.456.1)

Example Revision Numbering:

• Initial: 21.456
• First revision: 21.456.1
• Second revision: 21.456.2
• Third revision: 21.456.3

Version Number Format

Spec version numbers follow the format: <series>.<version>

Examples:

• 21.456.0 - Initial version of spec 21.456
• 21.456.1 - First revision of spec 21.456
• 22.101.3 - Third revision of spec 22.101

Database References

CR Database

Change Requests are tracked in a database accessible via:

• Netovate Search: Free CR database search tool
• Portal CR Database: 3GPP portal CR database
• Spec History: Each spec's history lists all approved CRs

Work Items

3GPP Work Items define features to be developed. New specs and CRs are linked to Work Items.

Key Points

• Spec Numbering is hierarchical: Series → Spec Number
• TR numbers are separate series: Use TR prefix for reports
• Revisions create new versions: Each CR creates a new version number
• Multiple CRs can affect one spec: All are merged into single version
• Mirror CRs require same WI code: For specs in multiple releases

Cross-References

• 3gpp-releases - For release structure and freeze concepts
• 3gpp-working-groups - For understanding which WG owns which specs
• 3gpp-change-request - For modification process via CRs
• 3gpp-meetings - For understanding when specs are approved (at TSG plenaries)

Resources

• 3GPP Official: https://www.3gpp.org/
• 3GPP Portal: https://portal.3gpp.org/
• 3GPP Work Plan: https://www.3gpp.org/specifications-technologies/3gpp-work-plan/
• MCC Info: Available in spec list tables

Usage in Code

Finding Spec Files

import requests
from bs4 import BeautifulSoup

# FTP directory for Release 18
base_url = "https://www.3gpp.org/ftp/Specs/2018-12/"
response = requests.get(base_url)
soup = BeautifulSoup(response.text, "html.parser")

# Parse all spec files
for link in soup.find_all("a", href=True):
    href = link.get("href")
    if href.endswith(".doc") or href.endswith(".zip"):
        print(f"Found spec: {href}")

Spec Number Parsing

import re


def parse_spec_number(filename: str) -> tuple:
    """Parse spec number from filename."""
    # Extract series number and spec number
    match = re.match(r"(\d{2})(\d{3})(\.doc|\.zip)", filename)
    if not match:
        return (None, None)

    return (match.group(1), match.group(2))

Common Patterns

Delta Directories

For parallel releases (e.g., Rel-4/5/6), 3GPP creates delta directories containing only changed specs.

Purpose: Reduce duplicate storage and make it easy to identify what's new in each release.

Versioning in Practice

• Dot notation: Use decimal versions for clarity (e.g., 21.456.1)
• Editorial changes: Occasionally updated by MCC, not versioned
• Major/minor changes: Some specs have major version increments between releases

Related Documents

• Versioning Scheme: https://www.3gpp.org/specifications-technologies/specifications-by-series/version-numbering-scheme
• Work Items: https://www.3gpp.org/specifications-technologies/3gpp-work-plan/what-is-a-work-item