Description
A 3GPP Technical Specification (TS) is the fundamental deliverable and building block of the entire 3GPP standardization process. It is a comprehensive, stand-alone document that formally specifies a particular aspect of the cellular system. Unlike a Technical Report (TR), which is informative, a TS is normative, meaning it defines the standards that equipment manufacturers and network operators must implement to achieve compliance and interoperability. Each TS is assigned a unique series number (e.g., 23.501, 38.300) that indicates its working group and subject area.
The structure of a TS is highly systematic. It typically includes scope, references, definitions, symbols and abbreviations, followed by detailed technical clauses. These clauses exhaustively describe architectural elements, protocol stacks, message formats, information elements, procedures (e.g., attach, handover, paging), state machines, and performance requirements. For example, TS 38.300 specifies the overall NR and NG-RAN architecture and procedures, while TS 38.331 details the NR Radio Resource Control (RRC) protocol. The specifications are layered, covering the Non-Access Stratum (NAS), Access Stratum (AS), and the physical layer, ensuring a complete definition from the core network to the radio interface.
In practice, engineers use TSs as the ultimate reference for designing chipsets, developing protocol stack software, planning networks, and conducting conformance testing. The specifications are living documents, constantly updated through Change Requests (CRs) in 3GPP meetings. Their creation involves rigorous technical debate, simulation, and validation to ensure they meet system requirements for performance, security, and backward compatibility. The ecosystem's health relies on the precision and clarity of these documents, as they allow different vendors to produce interoperable network elements and user devices, creating a cohesive global market.
Purpose & Motivation
The purpose of 3GPP Technical Specifications is to establish a single, globally accepted technical standard for cellular communication systems. This is critical to solve the fundamental problem of interoperability. Without such specifications, each region or vendor could develop incompatible technologies, leading to market fragmentation, higher costs, and a poor user experience (e.g., phones that only work in one country). The TS system provides the "rules of the road" that enable a device from any manufacturer to connect to any compliant network worldwide.
Historically, the need for such specifications became evident with the transition from analog (1G) to digital (2G GSM) systems. The success of GSM, defined by a comprehensive set of ETSI specifications (the precursor model to 3GPP TS), demonstrated the power of open, consensus-based standards. As technology evolved to 3G UMTS, 4G LTE, and now 5G NR, the scope and complexity of the specifications exploded to cover new services, higher data rates, lower latencies, and a vast array of use cases. The TS framework addresses the limitations of proprietary systems by fostering innovation through competition on implementation, rather than on the basic communication protocols, ensuring a stable foundation upon which the entire industry can build.
Detected Changes Across Releases
from 3GPP Change RequestsSpecific changes extracted from the „Change history“ tables of 3GPP specifications (17 CRs across 5 releases). Complements the general historical overview above with the evidence-based evolution of this function.
In Release 15, the specification for the TS function was upgraded to the Rel-15 version. Furthermore, platform-related test cases were removed from TS 31.122 as they were added to the external ETSI specification 102.230-2. This streamlined the 3GPP documentation by eliminating redundant content.
In Release 16, the primary updates for the TS function involved a version upgrade to align with the new release cycle and editorial clarifications. This included correcting an external reference to ETSI TS 102 230-2 and providing clarification on the use of the term "Category" across different specifications to ensure terminological consistency. The core drafting rules and structural principles for Technical Specifications, as defined in the document, remained unchanged, with the upgrade being largely administrative.
In Release 17, the primary updates to the TS function involved administrative and procedural simplifications rather than introducing new technical capabilities. Specifically, this included the simplification of TS 31.122 and the promotion or upgrade of other specifications to the Release 17 version without any accompanying technical change. These actions focused on maintaining document consistency and fitness for implementation as standards, in alignment with the existing rules for the structure and drafting of 3GPP specifications.
In Release 18, the TS function saw updates to its reference point architecture, specifically introducing the new N108 reference point and providing a corrected definition for the N42 reference point within the technical specifications. These changes were documented through specific Change Requests to TS 32.240. Additionally, corrections were applied to the scope and clause structures of other specifications, such as TS 26.260 and TS 31.122, to ensure consistency and accuracy.
- Rel-18 CR TS 32.240 Reference Points Correction TS 32.240CR0490
- Rel-18 CR TS 32.240 Update N42 ref point definition TS 32.240CR0494
- Rel-18 CR TS 32.240 Introduce N108 Reference Point TS 32.240CR0495
- Upgrade to Rel-18 version without technical change TS 43.129
- Corrections to TS 26.260 Clause 4 TS 26.260CR0004
- 31.122-Updating the scope of Rel 18 specification to cover all prior Releases TS 31.122CR0085
In Release 19, the key update for the TS function was to enhance the clarity of charging specifications, specifically those involving the Nchf interface. This was achieved by revising the drafting rules to ensure greater consistency and uniformity in terminology and structure across specifications. The changes reinforce the general principles that the same term must be used throughout a TS or series of TSs to designate a given concept, thereby improving comprehension and facilitating direct application of the standards.
Explore further
Broader topics and technologies where TS plays a role.
Defining Specifications
3GPP specifications that define or reference TS, with the latest known release. Sourced from the 3GPP document catalog — see methodology.
| Specification | Title | Release |
|---|---|---|
| TR 21.801 vj00 | 3GPP Specification Drafting Rules | Rel-19 |
| TR 21.905 vj00 | 3GPP Technical Terms and Definitions | Rel-19 |
| TS 22.105 vj00 | Telecommunication Services Framework | Rel-19 |
| TS 22.822 vg00 | Satellite Access in 5G Study | Rel-16 |
| TR 22.945 v1300 | Fax Services Guidance for GSM/UMTS | Rel-4 |
| TS 25.123 vj00 | Radio Resource Management for TDD | Rel-19 |
| TS 25.133 vj00 | UTRAN RRM Requirements for FDD | Rel-19 |
| TS 25.142 vj00 | UTRA TDD Base Station RF Test Methods | Rel-19 |
| TS 25.423 vj00 | UTRAN RNSAP Specification | Rel-19 |
| TR 25.914 vj00 | 3G UE Radio Performance Test Methods | Rel-19 |
| TS 26.093 vj00 | SCR operation of AMR codec for UMTS | Rel-19 |
| TS 26.193 vj00 | AMR-WB Source Controlled Rate (SCR) Operation | Rel-19 |
| TS 26.260 vj00 | Immersive Audio Objective Test Methods | Rel-19 |
| TS 26.261 vj00 | Electro-acoustic specs for immersive terminals | Rel-19 |
| TR 26.917 vj00 | TV Service Enhancements over 3GPP | Rel-19 |
| TR 28.839 vi10 | Technical Report | Rel-18 |
| TR 28.843 vi10 | Technical Report on Charging Aspects for Vertical Scenarios | Rel-18 |
| TS 29.007 vj00 | PLMN-PSTN/ISDN Interworking Requirements | Rel-19 |
| TS 29.332 vj00 | MGCF-IM-MGW Interface Protocol (Mn) | Rel-19 |
| TS 29.412 v1810 | Trunking Gateway Control Procedures | Rel-8 |
| TS 29.424 v801 | H.248 Profile for Trunking Media Gateways | Rel-8 |
| TS 31.112 v1800 | USAT Interpreter System Architecture | Rel-8 |
| TS 31.113 v1800 | USAT Interpreter Byte Code Specification | Rel-8 |
| TS 31.122 vi50 | USIM Conformance Test Specification | Rel-18 |
| TR 31.900 vj00 | 3GPP TS 31.900: Security Interworking Guidance | Rel-19 |
| TS 32.153 vj00 | IRP Technology-Specific Templates Specification | Rel-19 |
| TS 32.240 vj40 | Charging Management Architecture & Principles | Rel-19 |
| TS 32.251 vj00 | PS Domain Charging Management | Rel-19 |
| TS 32.252 vc00 | 3GPP WLAN Interworking Charging | Rel-12 |
| TS 32.270 vj00 | MMS Charging Management Specification | Rel-19 |
| TS 32.271 vj20 | 3GPP LCS Charging Management Spec | Rel-19 |
| TS 32.272 vj00 | Charging for Push-to-Talk over Cellular (PoC) | Rel-19 |
| TS 32.277 vj20 | Charging Management for Proximity Services (ProSe) | Rel-19 |
| TS 32.278 vj00 | Monitoring Events Offline Charging Specification | Rel-19 |
| TS 32.282 vi20 | Charging management; Time Sensitive Networking | Rel-18 |
| TS 32.383 v900 | Partial Suspension of Itf-N IRP CORBA SS | Rel-9 |
| TS 32.386 vj00 | Partial Suspension of Itf-N IRP Solution Set | Rel-19 |
| TS 32.445 v920 | Trace Management IRP XML File Format Definition | Rel-9 |
| TS 32.446 vj00 | Trace Management IRP Solution Set Definitions | Rel-19 |
| TS 36.133 vj20 | E-UTRA RRM Requirements | Rel-19 |
| TR 38.859 vi10 | Technical Report | Rel-18 |
| TS 43.129 vj00 | PS Handover in GERAN A/Gb and GAN Modes | Rel-19 |
| TS 52.402 vj00 | GSM Performance Management Measurements | Rel-19 |