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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  Q4-2023  Plenary Meetings.  The new ones are displayed with a single red dotted overline.
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TS 21.101
REL  3 → 17
Technical Specifications and Technical Reports
for a UTRAN-based 3GPP system

TS 21.111
REL  3 → 17
USIM and IC Card Requirements

TS 21.133
REL  3 → 4
Security Threats and Requirements

TS 21.201
REL  8 → 17
Technical Specifications and Technical Reports
relating to an EPS based 3GPP system

TS 21.202
REL  8 → 17
Technical Specifications and Technical Reports
relating to the Common IMS

TS 21.205
REL  15 → 17
Technical Specifications and Technical Reports
for a 5G based 3GPP system

TR 21.01u
REL  3
Requirements for the UTRA system

TR 21.801
REL  3 → 17
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 → 17
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

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