3GPP Specification series
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| spec number | title | notes |
|---|---|---|
| TS 21.010 | reserved | SPECIFICATION WITHDRAWN |
| TR 21.01U | Requirements for the UMTS Terrestrial Radio Access (UTRA) system | |
| TR 21.02U | High level requirements relevant for the definition of the UMTS Terrestrial Radio Access UTRA concept | SPECIFICATION WITHDRAWN |
| TR 21.04U | Requirements for the support of data services in UMTS | SPECIFICATION WITHDRAWN |
| TR 21.06U | O&M requirements for the UMTS | SPECIFICATION WITHDRAWN |
| TS 21.100 | 3G specification handling procedures | SPECIFICATION WITHDRAWN |
| TS 21.101 | Technical Specifications and Technical Reports for a UTRAN-based 3GPP system | |
| TS 21.102 | 3rd Generation mobile system Release 4 specifications | SPECIFICATION WITHDRAWN |
| TS 21.103 | 3rd Generation mobile system Release 5 specifications | SPECIFICATION WITHDRAWN |
| TS 21.104 | Technical Specifications and Technical Reports for a UTRAN-based 3GPP system (Rel-6) | SPECIFICATION WITHDRAWN |
| TS 21.111 | USIM and IC card requirements | |
| TS 21.133 | 3G security; Security threats and requirements | |
| TS 21.201 | Technical Specifications and Technical Reports for an Evolved Packet System (EPS) based 3GPP system | |
| TS 21.202 | Technical Specifications and Technical Reports relating to the Common IP Multimedia Subsystem (IMS) | |
| TS 21.205 | Technical Specifications and Technical Reports for a 5G based 3GPP system | |
| TR 21.801 | Specification drafting rules | |
| TR 21.810 | Report on multi-mode UE issues; ongoing work and identified additional work | SPECIFICATION WITHDRAWN |
| TR 21.866 | Study on Energy Efficiency Aspects of 3GPP Standards | |
| TR 21.877 | Radio optimization impacts on the Packet Switched (PS) domain architecture | SPECIFICATION WITHDRAWN |
| TR 21.900 | Technical Specification Group working methods | |
| TR 21.902 | Evolution of 3GPP system | |
| TR 21.904 | User Equipment (UE) capability requirements | |
| TR 21.905 | Vocabulary for 3GPP Specifications | |
| TS 21.906 | reserved | SPECIFICATION WITHDRAWN |
| TR 21.910 | Multi-mode UE issues; categories, principles and procedures | |
| TR 21.914 | Release 14 Description; Summary of Rel-14 Work Items | |
| TR 21.915 | Release 15 Description; Summary of Rel-15 Work Items | |
| TR 21.916 | Release 16 Description; Summary of Rel-16 Work Items | |
| TR 21.917 | Release 17 Description; Summary of Rel-17 Work Items | |
| TR 21.918 | Release 18 Description; Summary of Rel-18 Work Items | |
| TR 21.978 | Feasibility Technical Report; CAMEL Control of VoIP Services |