ETSI TS 138 133 V17.20.0 (2026-03)

5G; NR; Requirements for support of radio resource management (3GPP TS 38.133 version 17.20.0 Release 17)

RTS/TSGR-0438133vhk0

General Information

• Status: Not Published
• Technical Committee: 3GPP RAN 4 - Specification for radio performance
• Current Stage: 12 - Citation in the OJ (auto-insert)
• Completion Date: 04-Mar-2026

Standards Content (Sample)

TECHNICAL SPECIFICATION
5G;
NR;
Requirements for support of radio resource management
(3GPP TS 38.133 version 17.20.0 Release 17)

3GPP TS 38.133 version 17.20.0 Release 17 1 ETSI TS 138 133 V17.20.0 (2026-03)

Reference
RTS/TSGR-0438133vhk0
Keywords
5G
ETSI
650 Route des Lucioles
F-06921 Sophia Antipolis Cedex - FRANCE

Tel.: [phone]  Fax: [phone]

Siret N° 348 623 562 00017 - APE 7112B
Association à but non lucratif enregistrée à la
Sous-Préfecture de Grasse (06) N° w061004871

Important notice
The present document can be downloaded from the
ETSI Search & Browse Standards application.
The present document may be made available in electronic versions and/or in print. The content of any electronic and/or
print versions of the present document shall not be modified without the prior written authorization of ETSI. In case of any
existing or perceived difference in contents between such versions and/or in print, the prevailing version of an ETSI
deliverable is the one made publicly available in PDF format on ETSI deliver repository.
Users should be aware that the present document may be revised or have its status changed,
this information is available in the Milestones listing.
If you find errors in the present document, please send your comments to
the relevant service listed under Committee Support Staff.
If you find a security vulnerability in the present document, please report it through our
Coordinated Vulnerability Disclosure (CVD) program.
Notice of disclaimer & limitation of liability
The information provided in the present deliverable is directed solely to professionals who have the appropriate degree of
experience to understand and interpret its content in accordance with generally accepted engineering or
other professional standard and applicable regulations.
No recommendation as to products and services or vendors is made or should be implied.
No representation or warranty is made that this deliverable is technically accurate or sufficient or conforms to any law
and/or governmental rule and/or regulation and further, no representation or warranty is made of merchantability or fitness
for any particular purpose or against infringement of intellectual property rights.
In no event shall ETSI be held liable for loss of profits or any other incidental or consequential damages.

Any software contained in this deliverable is provided "AS IS" with no warranties, express or implied, including but not
limited to, the warranties of merchantability, fitness for a particular purpose and non-infringement of intellectual property
rights and ETSI shall not be held liable in any event for any damages whatsoever (including, without limitation, damages
for loss of profits, business interruption, loss of information, or any other pecuniary loss) arising out of or related to the use
of or inability to use the software.
Copyright Notification
No part may be reproduced or utilized in any form or by any means, electronic or mechanical, including photocopying and
microfilm except as authorized by written permission of ETSI.
The content of the PDF version shall not be modified without the written authorization of ETSI.
The copyright and the foregoing restriction extend to reproduction in all media.

© ETSI 2026.
All rights reserved.
ETSI
3GPP TS 38.133 version 17.20.0 Release 17 2 ETSI TS 138 133 V17.20.0 (2026-03)
Intellectual Property Rights
Essential patents
IPRs essential or potentially essential to normative deliverables may have been declared to ETSI. The declarations
pertaining to these essential IPRs, if any, are publicly available for ETSI members and non-members, and can be
found in ETSI SR 000 314: "Intellectual Property Rights (IPRs); Essential, or potentially Essential, IPRs notified to
ETSI in respect of ETSI standards", which is available from the ETSI Secretariat. Latest updates are available on the
ETSI IPR online database.
Pursuant to the ETSI Directives including the ETSI IPR Policy, no investigation regarding the essentiality of IPRs,
including IPR searches, has been carried out by ETSI. No guarantee can be given as to the existence of other IPRs not
referenced in ETSI SR 000 314 (or the updates on the ETSI Web server) which are, or may be, or may become,
essential to the present document.
Trademarks
The present document may include trademarks and/or tradenames which are asserted and/or registered by their owners.
ETSI claims no ownership of these except for any which are indicated as being the property of ETSI, and conveys no
right to use or reproduce any trademark and/or tradename. Mention of those trademarks in the present document does
not constitute an endorsement by ETSI of products, services or organizations associated with those trademarks.
DECT™, PLUGTESTS™, UMTS™ and the ETSI logo are trademarks of ETSI registered for the benefit of its
Members. 3GPP™, LTE™ and 5G™ logo are trademarks of ETSI registered for the benefit of its Members and of the
3GPP Organizational Partners. oneM2M™ logo is a trademark of ETSI registered for the benefit of its Members and of ®
the oneM2M Partners. GSM and the GSM logo are trademarks registered and owned by the GSM Association.
Legal Notice
This Technical Specification (TS) has been produced by the ETSI 3rd Generation Partnership Project (3GPP).
The present document may refer to technical specifications or reports using their 3GPP identities. These shall be
interpreted as being references to the corresponding ETSI deliverables.
The cross reference between 3GPP and ETSI identities can be found at 3GPP to ETSI numbering cross-referencing.
Modal verbs terminology
In the present document "shall", "shall not", "should", "should not", "may", "need not", "will", "will not", "can" and
"cannot" are to be interpreted as described in clause 3.2 of the ETSI Drafting Rules (Verbal forms for the expression of
provisions).
"must" and "must not" are NOT allowed in ETSI deliverables except when used in direct citation.

ETSI
3GPP TS 38.133 version 17.20.0 Release 17 3 ETSI TS 138 133 V17.20.0 (2026-03)
Contents
Intellectual Property Rights . 2
Legal Notice . 2
Modal verbs terminology . 2
Foreword . 119
1 Scope . 121
2 References . 121
3 Definitions, symbols and abbreviations . 122
3.1 Definitions . 122
3.2 Symbols . 124
3.3 Abbreviations . 125
3.4 Test tolerances . 127
3.5 Frequency bands grouping . 127
3.5.1 Introduction. 127
3.5.2 NR operating bands in FR1 . 128
3.5.2A NR operating bands for satellite access in FR1 . 128
3.5.3 NR operating bands in FR2 . 129
3.6 Applicability of requirements in this specification version . 129
3.6.1 RRC connected state requirements in DRX . 130
3.6.2 Number of serving carriers . 130
3.6.2.1 Number of serving carriers for SA . 130
3.6.2.2 Number of serving carriers for EN-DC . 130
3.6.2.3 Number of serving carriers for NE-DC . 130
3.6.2.4 Number of serving carriers for NR-DC . 131
3.6.3 Applicability for intra-band FR2 . 131
3.6.4 Applicability for FR2 UE power classes. 131
3.6.5 Applicability for SDL bands . 131
3.6.6 Applicability of requirements for NGEN-DC operation . 131
3.6.7 Applicability of QCL . 131
3.6.9 Applicability of requirements for scheduling availability. 132
3.6.10 Applicability of requirements for measurement restrictions . 132
3.6.11 Applicability of requirements for Redcap UEs . 132
3.6.11.1 RRC connected state requirements in DRX . 132
3.6.11.2 Applicability for FR2 Redcap UE power classes . 132
3.6.11.3 Applicability of QCL . 132
3.6.12 Applicability of requirements for Satellite Access . 133
3.6.13 Applicability of requirements for FR2 . 133
3.6.14 Applicability of requirements for FR2 Power Class 6 . 133
3.6.15 Applicability of requirements for per-FR gap . 133
4 SA: RRC_IDLE state mobility . 133
4.1 Cell Selection . 133
4.2 Cell Re-selection . 134
4.2.1 Introduction. 134
4.2.2 Requirements . 134
4.2.2.1 UE measurement capability . 134
4.2.2.2 Measurement and evaluation of serving cell . 134
4.2.2.3 Measurements of intra-frequency NR cells . 136
4.2.2.4 Measurements of inter-frequency NR cells . 140
4.2.2.5 Measurements of inter-RAT E-UTRAN cells . 144
4.2.2.6 Maximum interruption in paging reception . 147
4.2.2.7 General requirements . 147
4.2.2.8 Minimum requirement at transitions . 148
4.2.2.9 Measurements of intra-frequency NR cells for UE configured with relaxed measurement
criterion . 148
4.2.2.9.1 Introduction . 148
ETSI
3GPP TS 38.133 version 17.20.0 Release 17 4 ETSI TS 138 133 V17.20.0 (2026-03)
4.2.2.9.2 Measurements for UE fulfilling low mobility criterion . 148
4.2.2.9.3 Measurements for UE fulfilling not-at-cell edge criterion. 151
4.2.2.9.4 Measurements for UE fulfilling low mobility and not-at-cell edge criteria . 153
4.2.2.10 Measurements of inter-frequency NR cells for UE configured with relaxed measurement
criterion . 153
4.2.2.10.1 Introduction . 153
4.2.2.10.2 Measurements for UE fulfilling low mobility criterion . 153
4.2.2.10.3 Measurements for UE fulfilling not-at-cell edge criterion. 156
4.2.2.10.4 Measurements for UE fulfilling low mobility and not-at-cell edge criterion . 159
4.2.2.11 Measurements of inter-RAT E-UTRAN cells for UE configured with relaxed measurement
criterion . 159
4.2.2.11.1 Introduction . 159
4.2.2.11.2 Measurements for UE fulfilling low mobility criterion . 159
4.2.2.11.3 Measurements for UE fulfilling with not-at-cell edge criterion . 161
4.2.2.11.4 Measurements for UE fulfilling low mobility and not-at-cell edge criterion . 163
4.2A Cell Re-selection when subject to CCA . 163
4.2A.1 Introduction. 163
4.2A.2 Requirements . 164
4.2A.2.1 UE measurement capability . 164
4.2A.2.2 Measurement and evaluation when subject to CCA on the serving cell . 164
4.2A.2.3 Measurements of intra-frequency NR cells when subject to CCA on the serving cell and target
cell . 165
4.2A.2.4 Measurements of inter-frequency NR cells when subject to CCA on the target cell . 166
4.2A.2.5 Measurements of inter-RAT E-UTRAN cells when subject to CCA on the serving cell . 168
4.2A.2.6 Maximum interruption in paging reception when subject to CCA on the target cell . 168
4.2A.2.7 General requirements . 169
4.2B Cell Re-selection for RedCap . 169
4.2B.1 Introduction. 169
4.2B.2 Requirements . 169
4.2B.2.1 UE measurement capability for RedCap . 169
4.2B.2.1.1 UE measurement capability for 1 Rx RedCap . 169
4.2B.2.1.2 UE measurement capability for 2 Rx RedCap . 169
4.2B.2.2 Measurement and evaluation of serving cell for RedCap UE . 169
4.2B.2.3 Measurements of intra-frequency NR cells for RedCap UE . 171
4.2B.2.4 Measurements of inter-frequency NR cells for RedCap UE . 174
4.2B.2.5 Measurements of inter-RAT E-UTRAN cells for RedCap UE . 177
4.2B.2.6 Maximum interruption in paging reception for RedCap . 179
4.2B.2.7 General requirements for RedCap . 179
4.2B.2.8 Minimum requirement at transitions . 179
4.2B.2.9 Measurements of intra-frequency NR cells for UE configured with relaxed measurement
criterion for RedCap . 180
4.2B.2.9.1 Introduction . 180
4.2B.2.9.2 Measurements for UE fulfilling stationary criterion . 180
4.2B.2.9.3 Measurements for a UE fulfilling not-at-cell edge while stationary criterion . 183
4.2B.2.9.3A Measurements for a UE fulfilling stationary and not-at-cell-edge criteria . 183
4.2B.2.9.4 Measurements for a UE fulfilling low mobility and stationary criteria . 184
4.2B.2.9.5 Measurements for a UE fulfilling low mobility and not-at-cell-edge while stationary criteria . 184
4.2B.2.9.6 Measurements for a UE fulfilling not-at-cell edge and not-at-cell edge while stationary
criteria . 184
4.2B.2.9.7 Measurements for a UE fulfilling low mobility and not-at-cell edge criteria and not-at-cell-

edge while stationary criteria . 185
4.2B.2.9.8 Measurements for a UE fulfilling low mobility, not-at-cell edge and stationary criterion . 185
4.2B.2.9.9 Measurements for UE fulfilling low mobility criterion . 185
4.2B.2.9.10 Measurements for UE fulfilling not-at-cell edge criterion. 188
4.2B.2.9.11 Measurements for UE fulfilling low mobility and not-at-cell edge criteria . 190
4.2B.2.10 Measurements of inter-frequency NR cells for UE configured with relaxed measurement
criterion . 190
4.2B.2.10.1 Introduction . 190
4.2B.2.10.2 Measurements for UE fulfilling stationary criterion . 191
4.2B.2.10.3 Measurements for a UE fulfilling not-at-cell edge while stationary criterion . 193
4.2B.2.10.3A Measurements for a UE fulfilling stationary and not-at-cell-edge-criterion . 194
4.2B.2.10.4 Measurements for a UE fulfilling low mobility and stationary criteria . 194
ETSI
3GPP TS 38.133 version 17.20.0 Release 17 5 ETSI TS 138 133 V17.20.0 (2026-03)
4.2B.2.10.5 Measurements for a UE fulfilling low mobility and not-at-cell-edge while stationary criteria . 195
4.2B.2.10.6 Measurements for a UE fulfilling not-at-cell edge and not-at-cell edge while stationary

criteria . 195
4.2B.2.10.7 Measurements for a UE fulfilling low mobility and not-at-cell edge criteria and not-at-cell-
edge while stationary criteria . 195
4.2B.2.10.8 Measurements for a UE fulfilling low mobility, not-at-cell edge and stationary criteria . 195
4.2B.2.10.9 Measurements for UE fulfilling low mobility criterion . 196
4.2B.2.10.10 Measurements for UE fulfilling not-at-cell edge criterion. 198
4.2B.2.10.11 Measurements for UE fulfilling low mobility and not-at-cell edge criterion . 201
4.2B.2.11 Measurements of inter-RAT E-UTRAN cells for UE configured with relaxed measurement
criterion . 201
4.2B.2.11.1 Introduction . 201
4.2B.2.11.2 Measurements for UE fulfilling stationary criterion . 201
4.2B.2.11.3 Measurements for a UE not-at-cell edge while stationary criterion . 203
4.2B.2.11.3A Measurements for a UE fulfilling stationary and not-at-cell-edge criterion . 203
4.2B.2.11.4 Measurements for a UE fulfilling low mobility and stationary criteria . 204
4.2B.2.11.5 Measurements for a UE fulfilling low mobility and stationary not-at-cell-edge while
stationary criteria . 204
4.2B.2.11.6 Measurements for a UE fulfilling not-at-cell edge and not-at-cell edge while stationary
criteria . 204
4.2B.2.11.7 Measurements for a UE fulfilling low mobility and not-at-cell edge criteria and not-at-cell-
edge while stationary criteria . 204
4.2B.2.11.8 Measurements for a UE fulfilling low mobility, not-at-cell edge and stationary criteria . 204
4.2B.2.11.9 Measurements for UE fulfilling low mobility criterion . 205
4.2B.2.11.10 Measurements for UE fulfilling with not-at-cell edge criterion . 206
4.2B.2.11.11 Measurements for UE fulfilling low mobility and not-at-cell edge criterion . 207
4.2C Cell Re-selection for NR UE for Satellite Access . 208
4.2C.1 Introduction. 208
4.2C.2 Requirements . 208
4.2C.2.1 UE measurement capability . 208
4.2C.2.2 Measurement and evaluation of serving cell . 208
4.2C.2.3 Measurements of intra-frequency NR cells . 209
4.2C.2.4 Measurements of inter-frequency NR cells . 212
4.2C.2.5 Maximum interruption in paging reception . 215
4.2C.2.6 Minimum requirement at transitions . 215
4.2C.2.7 Measurements of intra-frequency NR cells for UE configured with relaxed measurement
criterion . 215
4.2C.2.8 Measurements of inter-frequency NR cells for UE configured with relaxed measurement

criterion . 215
4.2C.2.9 General requirements . 216
4.3 Minimization of Drive Tests (MDT) . 216
4.3.1 Introduction. 216
4.3.2 Measurement Requirements. 216
4.3.3 Requirements for Relative Time Stamp Accuracy . 217
4.3.4 Requirements for Relative Time Stamp Accuracy for RRC Connection Establishment Failure Log
Reporting . 217
4.3.5 Requirements for Relative Time Stamp Accuracy for Radio Link Failure and Handover Failure Log
Reporting . 217
4.3C Minimization of Drive Tests (MDT) for Satellite Access . 217
4.3C.1 Introduction. 217
4.3C.2 Measurement Requirements. 218
4.3C.3 Requirements for Relative Time Stamp Accuracy . 218
4.3C.4 Requirements for Relative Time Stamp Accuracy for RRC Connection Establishment Failure Log
Reporting . 218
4.3C.5 Requirements for Relative Time Stamp Accuracy for Radio Link Failure and Handover Failure Log
Reporting . 219
4.4 Idle Mode CA/DC Measurements . 219
4.4.1 Introduction. 219
4.4.2 Measurement Requirements. 219
4.4.2.1 Detected cell requirement during state transition and Idle mode . 219
4.4.2.2 Measurements of inter-frequency CA/DC candidate cells . 220
4.4.2.3 Measurements on serving cell . 221
ETSI
3GPP TS 38.133 version 17.20.0 Release 17 6 ETSI TS 138 133 V17.20.0 (2026-03)
4.4.2.4 Measurements of E-UTRAN inter-RAT DC candidate cells . 221
5 SA: RRC_INACTIVE state mobility . 222
5.1 Cell Re-selection . 222
5.1.1 Introduction. 222
5.1.2 Requirements . 222
5.1.2.1 UE measurement capability . 222
5.1.2.2 Measurement and evaluation of serving cell . 222
5.1.2.3 Measurements of intra-frequency NR cells . 223
5.1.2.4 Measurements of inter-frequency NR cells . 224
5.1.2.5 Measurements of inter-RAT E-UTRAN cells . 225
5.1.2.6 Maximum interruption in paging reception . 225
5.1.2.7 General requirements . 225
5.1.2.8 Minimum requirement at transitions . 226
5.1.2.9 Measurements of intra-frequency NR cells for UE configured with relaxed measurement
criterion . 226
5.1.2.10 Measurements of inter-frequency NR cells for UE configured with relaxed measurement
criterion . 227
5.1.2.11 Measurements of inter-RAT E-UTRAN cells for UE configured with relaxed measurement
criterion . 228
5.1A Cell Re-selection with CCA . 228
5.1A.1 Introduction. 228
5.1A.2 Requirements . 228
5.1A.2.1 UE measurement capability . 228
5.1A.2.2 Measurement and evaluation when CCA is used on the serving cell . 228
5.1A.2.3 Measurements of intra-frequency NR cells when CCA is used on the serving cell and target cell . 229
5.1A.2.4 Measurements of inter-frequency NR cells when CCA is used on the target cell . 229
5.1A.2.5 Measurements of inter-RAT E-UTRAN cells when CCA is used on the serving cell . 229
5.1A.2.6 Maximum interruption in paging reception when CCA is used on the target cell . 229
5.1A.2.7 General requirements . 229
5.1B Cell Re-selection for RedCap . 229
5.1B.1 Introduction. 229
5.1B.2 Requirements . 229
5.1B.2.1 UE measurement capability . 229
5.1B.2.2 Measurement and evaluation of serving cell . 229
5.1B.2.3 Measurements of intra-frequency NR cells . 230
5.1B.2.4 Measurements of inter-frequency NR cells . 231
5.1B.2.5 Measurements of inter-RAT E-UTRAN cells . 232
5.1B.2.6 Maximum interruption in paging reception . 232
5.1B.2.7 General requirements . 232
5.1B.2.8 Minimum requirement at transitions . 232
5.1B.2.9 Measurements of intra-frequency NR cells for UE configured with relaxed measurement
criterion . 233
5.1B.2.10 Measurements of inter-frequency NR cells for UE configured with relaxed measurement
criterion . 233
5.1B.2.11 Measurements of inter-RAT E-UTRAN cells for UE configured with relaxed measurement
criterion . 234
5.1C Cell Re-selection . 235
5.1C.1 Introduction. 235
5.1C.2 Requirements . 235
5.1C.2.1 UE measurement capability . 235
5.1C.2.2 Measurement and evaluation of serving cell . 235
5.1C.2.3 Measurements of intra-frequency NR cells . 235
5.1C.2.4 Measurements of inter-frequency NR cells . 236
5.1C.2.5 Maximum interruption in paging reception . 236
5.1C.2.6 General requirements . 236
5.2 Void . 236
5.2B Configured Grant based Small Data Transmissions (CG-SDT) for RedCap . 236
5.2B.1 Introduction. 236
5.2B.2 Requirements on UE synchronization for small data transmissions for RedCap . 236
5.2B.2.1 Void. 236
5.2B.3 TA validation requirements for RedCap . 236
ETSI
3GPP TS 38.133 version 17.20.0 Release 17 7 ETSI TS 138 133 V17.20.0 (2026-03)
5.2B.3.1 Void. 237
5.2B.3.2 Void. 237
5.2B.4 Scheduling restriction . 237
5.2B.5 Applicability conditions for CG-SDT for RedCap . 238
5.3 Minimization of Drive Tests (MDT) . 238
5.3.1 Introduction. 238
5.3.2 Measurement Requirements. 238
5.3.3 Requirements for Relative Time Stamp Accuracy . 238
5.3.4 Requirements for Relative Time Stamp Accuracy for RRC Connection Establishment Failure Log
Reporting . 238
5.3.5 Requirements for Relative Time Stamp Accuracy for Radio Link Failure and Handover Failure Log
Reporting . 238
5.3.6 Requirements for Relative Time Stamp Accuracy for RRC Resume Failure Log Reporting . 239
5.3C Minimization of Drive Tests (MDT) for Satellite Access . 239
5.3C.1 Introduction. 239
5.3C.2 Measurement Requirements. 239
5.3C.3 Requirements for Relative Time Stamp Accuracy . 239
5.3C.4 Requirements for Relative Time Stamp Accuracy for RRC Connection Establishment Failure Log
Reporting . 239
5.3C.5 Requirements for Relative Time Stamp Accuracy for Radio Link Failure and Handover Failure Log

Reporting . 239
5.3C.6 Requirements for Relative Time Stamp Accuracy for RRC Resume Failure Log Reporting . 240
5.4 Inactive Mode CA/DC Measurements . 240
5.4.1 Introduction. 240
5.4.2 Measurement Requirements. 240
5.4.2.1 Detected cell requirement during state transition and inactive mode . 240
5.4.2.2 Measurements of inter-frequency CA/DC candidate cells . 240
5.4.2.3 Measurements on serving cell .
...