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3GPP 21-series – Requirements

The technical specifications (TS) are displayed in blue, while the reports (TR) are shown in green.  TS that have been discontinued in earlier releases are indicated with a light blue color.  TR in the '9' range that have been stopped are highlighted in light green.  TS or TR with a yellow background indicate those updated at the latest  Q3-2025  Plenary Meetings, excepted if it is an automatic upgrade to Rel-19.  The new ones are displayed with a single red dotted overline.
101  111  133  201  202  205  01u  801  866  900  902  904  905  910  914  915  916  917  918  978 
a vertical bar on the left means that the full text and graphic content are available online for this TS/TR
when it is darker, it means that all the figures have been redrawn, or that there are no figures
10 p.
 TS 21.101 REL  3 → 19 Technical Specifications and Technical Reports for a UTRAN-based 3GPP system
19 p.
 TS 21.111 REL  3 → 19 USIM and IC Card Requirements
27 p.
 TS 21.133 REL  3 → 4 Security Threats and Requirements
9 p.
 TS 21.201 REL  8 → 19 Technical Specifications and Technical Reports relating to an EPS based 3GPP system
9 p.
 TS 21.202 REL  8 → 19 Technical Specifications and Technical Reports relating to the Common IMS
9 p.
 TS 21.205 REL  15 → 19 Technical Specifications and Technical Reports for a 5G based 3GPP system
25 p.
 TR 21.01u REL  3 Requirements for the UTRA system
55 p.
 TR 21.801 REL  3 → 19 Specification Drafting Rules
31 p.
 TR 21.866 REL  15 Study on Energy Efficiency Aspects of 3GPP Standards
43 p.
 TR 21.900 REL  3 → 19 Technical Specification Group Working Methods
18 p.
 TR 21.902 REL  6 → 10 Evolution of 3GPP system
49 p.
 TR 21.904 REL  3 UE Capability requirements
69 p.
 TR 21.905 REL  3 → 19 Vocabulary for 3GPP Specifications
12 p.
 TR 21.910 REL  3 Multi-mode UE issues: categories, principles and procedures
104 p.
 TR 21.914 REL  14 Release-14 Description
120 p.
 TR 21.915 REL  15 Release 15 Description – Summary of Rel‑15 Work Items
168 p.
 TR 21.916 REL  16 Release 16 Description – Summary of Rel‑16 Work Items
169 p.
 TR 21.917 REL  17 Release 17 Description – Summary of Rel‑17 Work Items
231 p.
 TR 21.918 REL  18 Release 18 Description – Summary of Rel‑18 Work Items
39 p.
 TR 21.978 REL  3 CAMEL Control of VoIP Services
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