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Technical contribution discussing limitations of existing 5G NR MIMO PRB usage definitions in 3GPP specifications and proposing the use of time-domain average maximum scheduled layer numbers as a dynamic spatial factor for cell-level resource utilization evaluation.
Meeting:
3GPP TSG-SA5 Meeting #140-e
Document number:
S5-216134e
Date:
15–24 November 2021
Source organization:
China Unicom
Agenda item:
6.4.61
Document type:
Technical discussion paper
Intended action:
Approval and endorsement
Standardization body:
3GPP
Related specifications:
3GPP TS 28.552; 3GPP TS 38.314
Technology area:
5G NR network management and performance measurement
Subject:
MIMO PRB usage definition and measurement granularity
Scope:
Downlink and uplink PRB usage per NRCellDU
Period referenced:
October–November 2021
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Year:
2025
Location:
Dallas, USA
Type of document:
Draft technical report
Organization:
3GPP TSG RAN WG1
Author:
Moderator (MediaTek)
Agenda item:
10.2.2
Purpose:
Discussion and decision on enhancing DL CSI acquisition
Target audience:
Companies participating in 3GPP RAN1 discussions
Related contributions:
38 company inputs summarized
Period:
November 17–21, 2025
Date of draft:
2025-11-17
Year:
2025
Region / City:
Bengaluru, India
Theme:
NR MIMO Ph5 draft CR, Release 19
Document Type:
Meeting Summary
Organization:
3GPP TSG RAN WG1
Author:
Nokia
Target Audience:
3GPP Working Group Members, Industry Professionals
Period of validity:
Until September 10th, 2025
Approval Date:
N/A
Date of Changes:
05.09.2025
Note:
Contextual Description
Year:
2022
Region / City:
Global
Theme:
Telecommunications, 5G
Document Type:
Meeting Report
Organization:
3GPP TSG-RAN4
Author:
Not specified
Target Audience:
Technical experts, industry professionals
Period of Action:
Not specified
Approval Date:
Not specified
Modification Date:
Not specified
Year:
2020
Meeting:
3GPP TSG-RAN WG4 Meeting #96-e
Meeting Type:
Electronic Meeting
Meeting Date:
17 August – 28 August 2020
Agenda Item:
12.1.3
Source:
Keysight Technologies
Document Number:
R4-2011216201xxxx
Document For:
Approval
Technical Domain:
NR FR2 MIMO OTA Testing
Related Work Items:
NR MIMO SI; NR MIMO WI opened in RAN#88-e
Referenced Specification:
TS 38.521-2
Test Configuration:
NR FR2 MIMO MPAC system with roll-over-AZ combined-axes positioning
Number of Test Points:
36 evenly spaced FR2 test points
Measurement Metrics:
EIRP; EIS; TRP
Validation Procedure:
Quality of the Quiet Zone (QoQZ)
Year:
2022
Region / City:
N/A
Topic:
Wireless Communication
Document Type:
Meeting Document
Organization:
3GPP TSG-RAN4
Author:
N/A
Target Audience:
Technical Experts in Wireless Communications
Action:
Approval
Period of Effectiveness:
N/A
Approval Date:
N/A
Date of Changes:
N/A
References:
38.101-1, R4-2205610, R4-220xxxx
Year:
2026
Location:
Gothenburg, Sweden
Topic:
NR MIMO Phase 6, DL CSI acquisition enhancements
Document type:
Draft report for discussion and decision
Organization:
3GPP TSG RAN WG1
Author/Moderator:
MediaTek
Target audience:
Participating companies and delegates in 3GPP RAN WG1 meetings
Period of application:
Rel-20 NR MIMO standardization phase
Agenda item:
9.2.2
Source:
Moderator summary
Key issues:
Early SRS/CSI/CSI-RS triggering, CSI-RS frequency-domain density reduction
Contributors:
Apple, AT&T, CATT, CMCC, CEWiT, China Telecom, Ericsson, ETRI, Futurewei, Fujitsu, Google, Huawei, HONOR, IIT Kanpur, InterDigital, Kyocera, Lenovo, LG, MediaTek, Nokia, NTT DOCOMO, NEC, NICT, Panasonic, Qualcomm, Rakuten, Samsung, Sony, Spreadtrum, Sharp, TCL, Tejas, Vivo, Xiaomi, ZTE
Contact information:
See draft document table
Year:
2026
Region / City:
Gothenburg, Sweden
Theme:
MIMO, CJTC, UE Features
Document Type:
Meeting Document
Organization / Institution:
3GPP RAN WG4
Author:
Thomas Zhang
Target Audience:
RAN WG2, RAN WG1
Period of Validity:
February 2026
Approval Date:
N/A
Date of Changes:
N/A
Context:
Technical document related to the specification and requirements for Rel-19 MIMO Phase 5 features discussed in the context of 3GPP TSG-RAN WG4.
Year:
2023
Event:
3GPP TSG RAN WG1 #112 Meeting
Location:
Athens, Greece
Meeting Dates:
February 27 – March 3, 2023
Organization:
3rd Generation Partnership Project (3GPP)
Working Group:
TSG RAN WG1
Source:
Moderator (NTT DOCOMO)
Agenda Item:
9.1.3.1
Document Identifier:
R1-2301774
Document Type:
Technical discussion and decision contribution
Topic:
MIMO and DMRS enhancements for 5G NR Rel-18
Technical Focus:
Downlink and uplink DMRS port expansion, MU-MIMO support, antenna port indication for PDSCH, S-TRP and M-TRP scenarios
Standardization Context:
5G NR Release 18 study and specification work
Participating Companies Mentioned:
NTT DOCOMO, Qualcomm, ZTE, vivo, Ericsson, Intel, Nokia, Samsung, OPPO, MediaTek, LG, Lenovo, CATT, CMCC, New H3C, Sharp
Subject Area:
Wireless communications standardization and physical layer design
Year:
2021
Region / City:
International / Remote electronic meeting
Subject:
5G NR UE RF and MIMO enhancements
Document type:
Meeting summary
Organization:
3GPP TSG-RAN WG4
Authors:
Huawei, HiSilicon, ZTE, CMCC, OPPO, Apple, Nokia
Agenda items:
12.2.1, 12.2.2.1, 12.2.2.4
Period:
Jan 25 – Feb 5, 2021
Status:
Information
Topics:
Work plan for Rel-17 FR1 UE RF enhancement, UL MIMO configuration for SUL bands, intra-band contiguous UL CA PC2, 4×4 DL MIMO for CA_n77
Year:
2024
Location:
Maastricht, Netherlands
Topic:
NR MIMO Phase 5 UE RF and RRM Requirements
Document type:
Meeting summary / Technical contribution
Organization:
3GPP TSG-RAN WG4
Authors:
Samsung, Qualcomm Incorporated, Qualcomm Technologies Int
Target audience:
3GPP members, RAN4 working group
Agenda items:
8.18.4
Scope:
UE RF requirements, RRM core requirements, demod/CSI requirements, MIMO Phase 5
Meeting dates:
19–23 August 2024
Planned follow-up meetings:
RAN4#112-bis (Oct 2024) – RAN4#118 (Feb 2026)
Focus:
UE-initiated/event-driven beam management, CSI-RS port enhancements, asymmetric DL sTRP/UL mTRP scenarios, 3-antenna-port transmissions
Year:
2023
Region / City:
Gothenburg, Sweden
Topic:
5G NR, AI/ML, MIMO, LP-WUS, Network technology
Document Type:
Meeting Report
Organization / Institution:
3GPP TSG-RAN WG2
Author:
Vice Chairman (CATT)
Target Audience:
Members of 3GPP TSG-RAN WG2, network engineers, and AI/ML specialists
Period of Validity:
Feb. 09th – 13th, 2023
Approval Date:
Not specified
Amendment Date:
Not specified
Year:
2026
Location:
Gothenburg, Sweden
Meeting:
3GPP TSG-RAN WG2 Meeting #133
Agenda item:
11.2
Document type:
Meeting session report and discussion summary
Organization:
3GPP TSG-RAN WG2
Source:
RAN2 Vice Chairman (CATT)
Technical domain:
5G NR radio access network specifications
Topics:
Rel-18/19 MIMO evolution, AI/ML for NR air interface, NR positioning, beam management, RRC procedures
Related specifications:
TS 38.331, TS 37.355, TS 38.306
Working groups referenced:
RAN1, RAN2, RAN3, RAN4, SA, SA5
Contributors:
Ericsson, Qualcomm Incorporated, Huawei, HiSilicon, Apple, OPPO, ZTE Corporation, Sanechips, Nokia, Samsung, Xiaomi, LG
Document category:
Organizational email discussion and technical contribution summary
Relevant releases:
3GPP Release 18, Release 19, Release 20
Year:
2026
Location:
Gothenburg, Sweden
Subject:
NR MIMO Phase 6, DL CSI acquisition enhancements
Document type:
Draft summary for discussion and decision
Organization:
3GPP TSG RAN WG1
Author/Moderator:
MediaTek
Target audience:
3GPP member companies and delegates
Agenda item:
9.2.2
Period of application:
February 9–13, 2026
Proposals included:
Early SRS/CSI/CSI-RS triggering, SCell activation/deactivation handling, CSI-RS density adjustments
Contact information:
Detailed company and delegate contacts included for offline/online discussions
Year:
2021
Region / City:
Visakhapatnam, India
Topic:
Channel Estimation, Massive MIMO, Pilot Contamination
Document Type:
Research Paper
Organization / Institution:
Sanketika Vidya Parishad Engineering College
Author(s):
M. Keerthi, T. Ravi Babu, Manas Ranjan Biswal
Target Audience:
Researchers, Engineers, Academics in Communications
Period of Effectiveness:
Ongoing
Date of Approval:
Not specified
Date of Changes:
Not specified
Year:
2023
Region / city:
St. Julian’s, Malta
Topic:
MIMO, UL skipping, beam reporting
Document type:
Technical Discussion
Organization / Institution:
3GPP TSG-RAN WG2
Author:
Samsung
Target audience:
3GPP Working Group Members
Period of validity:
Until the next agreement
Approval date:
May 2023
Modification date:
Not specified
Intended outcome:
Updated CR based on new agreements
Discussion:
UL skipping, MIMO reporting
Deadline:
May 2nd, 1000 UTC
WID/SID:
NR_MIMO_Ph5
Source:
Samsung
Agenda item:
x.x.x
Contextual description:
The document outlines open technical issues related to MIMO beam reporting and uplink (UL) skipping, discussing potential updates to existing procedures within the 3GPP RAN2 group.
Year:
2009
Region / City:
EU
Theme:
Fuel Cells, Hydrogen, Research
Document Type:
Guide
Organization / Institution:
Fuel Cells and Hydrogen Joint Undertaking (FCH JU)
Author:
FCH JU Governing Board
Target Audience:
Researchers, Institutions, SMEs, Industry
Period of Validity:
N/A
Approval Date:
15 May 2009
Amendments Date:
N/A
Year:
2023
Region / City:
Japan
Topic:
Pulmonary disease, stem cells, regenerative medicine
Document Type:
Research article
Organization / Institution:
Nagasaki University, Tokyo University
Author:
Mayumi Iwatake, Tokiko Nagamura-Inoue, Ryoichiro Doi, Yukinori Tanoue, Mitsutoshi Ishii, Hiroshi Yukawa, Tomoshi Tsuchiya
Target Audience:
Researchers, clinicians in regenerative medicine
Period of Validity:
N/A
Approval Date:
N/A
Date of Changes:
N/A
Cell culture:
Human umbilical cord mesenchymal stem cells (UC-MSCs)
Animal model:
C57BL/6 mice
Ethical compliance:
Nagasaki University Institutional Animal Care and Use Committee
Note:
Approval No. 1807101460-2
Year:
2014
Region / City:
Bethesda MD
Topic:
Blood transfusion, red blood cells, medical procedures
Document Type:
Manual
Organization / Institution:
AABB
Author:
MK Fung (Editor)
Target Audience:
Medical professionals, blood transfusion specialists
Period of Validity:
24 hours after preparation
Approval Date:
September 1, 2014
Date of Revision:
April 11, 2016, August 30, 2016
Procedure Code:
CSP.010, IM.002, IM.004
Related Standards:
Canadian Society for Transfusion Medicine, AABB Technical Manual
Keywords:
Washed red blood cells, transfusion, blood processing, medical procedure, IgA deficient patients
Note:
Contextual Description
Rapid Fabrication of Mesoporous TiO2 thin films by Pulsed Fibre Laser for Dye Sensitized Solar Cells
Year:
2026
Region / city:
Manchester, UK
Theme:
Solar Energy, Materials Science
Document Type:
Research Paper
Organization / Institution:
The University of Manchester
Author:
Aseel Hadi, Mansour Alhabradi, Qian Chen, Hong Liu, Wei Guo, Michele Curioni, Robert Cernik, Zhu Liu
Target Audience:
Researchers in material science and solar energy
Period of validity:
Not specified
Approval Date:
Not specified
Date of Changes:
Not specified
Year:
2026
Region / City:
London
Topic:
Smart Metering, Network Operators, Trust Anchor Cells
Document Type:
Engineering Recommendation
Organization:
Energy Networks Association
Author:
Energy Networks Association
Target Audience:
Energy suppliers, network operators
Effective Period:
Ongoing
Approval Date:
January 2026
Revision Date:
January 2026