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 Q2-2024 Plenary Meetings. The new ones are displayed with a single red dotted overline.
TS 21.101
REL 3 → 18
Technical Specifications and Technical Reports
for a UTRAN-based 3GPP system
for a UTRAN-based 3GPP system
TS 21.111
REL 3 → 18
USIM and IC Card Requirements
TS 21.133
REL 3 → 4
Security Threats and Requirements
TS 21.201
REL 8 → 18
Technical Specifications and Technical Reports
relating to an EPS based 3GPP system
relating to an EPS based 3GPP system
TS 21.202
REL 8 → 18
Technical Specifications and Technical Reports
relating to the Common IMS
relating to the Common IMS
TS 21.205
REL 15 → 18
Technical Specifications and Technical Reports
for a 5G based 3GPP system
for a 5G based 3GPP system
TR 21.01u
REL 3
Requirements for the UTRA system
TR 21.801
REL 3 → 18
Specification Drafting Rules
TR 21.866
REL 15
Study on Energy Efficiency Aspects of 3GPP Standards
TR 21.900
REL 3 → 18
Technical Specification Group Working Methods
TR 21.902
REL 6 → 10
Evolution of 3GPP system
TR 21.904
REL 3
UE Capability requirements
TR 21.905
REL 3 → 18
Vocabulary for 3GPP Specifications
TR 21.910
REL 3
Multi-mode UE issues: categories, principles and procedures
TR 21.914
REL 14
Release-14 Description
TR 21.915
REL 15
Release 15 Description – Summary of Rel‑15 Work Items
TR 21.916
REL 16
Release 16 Description – Summary of Rel‑16 Work Items
TR 21.917
REL 17
Release 17 Description – Summary of Rel‑17 Work Items
TR 21.978
REL 3
CAMEL Control of VoIP Services
