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Summary of submitted contributions and discussion topics on HARQ operation in 6G Radio Access Networks, including design considerations, feedback mechanisms, retransmission procedures, and lessons learned from LTE and NR implementations.
Year:
2026
Location:
Gothenburg, Sweden
Topic:
6G Radio Access Network, HARQ operation
Document type:
Draft contribution
Organization:
3GPP TSG RAN WG1
Author:
Moderator (OPPO)
Agenda item:
10.5.4.3
Purpose:
Discussion and Decision
Frequency ranges:
FR1, FR2-1 up to 52.6 GHz
Technical focus:
Stand-alone architecture, HARQ operation, MIMO, waveform design, spectrum utilization
Target audience:
RAN1 working group members
Date of meeting:
February 09 – 13, 2026
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Year:
2026
City:
Gothenburg
Country:
Sweden
Meeting:
3GPP TSG RAN WG1 #124
Agenda item:
10.5.4.3
Organization:
3GPP TSG RAN Working Group 1
Source:
Moderator (OPPO)
Document number:
R1-2601540
Document status:
Draft
Document for:
Discussion and Decision
Topic:
6G Radio (6GR) HARQ operation
Technical field:
Wireless communications and radio access technology
Related standards:
TR 38.914, TR 38.921, TR 38.922
Frequency scope:
Up to 52.6 GHz including FR1 and FR2-1
Key technologies:
HARQ, OFDM-based waveforms, LDPC, Polar Code, MIMO
Scope:
Physical layer control, data scheduling and retransmission mechanisms
Working group area:
RAN1 physical layer study for 6G radio access
Timeframe of meeting:
09–13 February 2026
Year:
2026
Region / city:
Gothenburg, Sweden
Topic:
6G Radio technology, HARQ operation
Document Type:
Draft
Organization:
3GPP TSG RAN WG1
Author:
Moderator (OPPO)
Target audience:
Researchers and engineers in telecommunications
Period of validity:
February 09-13, 2026
Approval date:
N/A
Date of changes:
N/A
Year:
2026
Region / City:
Gothenburg, Sweden
Theme:
6G Radio Access Technology, HARQ
Document Type:
Meeting Draft
Author:
Moderator (OPPO)
Target Audience:
RAN WG members, 6G researchers, telecommunications engineers
Period of Action:
February 09 – 13, 2026
Approval Date:
N/A
Date of Modifications:
N/A
Agenda Item:
10.5.4.3
Discussion Type:
Discussion and Decision
Scope:
6G Radio, HARQ Operations
Related Documents:
RP-253876, TR38.914, RP-250810, TR 38.921, TR 38.922
Technical Focus:
Hybrid Automatic Repeat Request (HARQ)
Network:
6G, LTE, NR
Standardization Area:
RAN
Contributions:
Technical proposals and outcomes for HARQ operations in 6GR
Year:
2026
Location:
Gothenburg, Sweden
Subject:
6G Radio Access, HARQ operation
Document type:
Draft contribution for working group meeting
Organization:
3GPP TSG RAN WG1
Author:
Moderator (OPPO)
Agenda item:
10.5.4.3
Purpose:
Discussion and Decision
Scope:
Frequency ranges up to 52.6 GHz, FR1 to FR2-1, 6GR standalone architecture
Standards referenced:
TR38.914, TR38.921, TR38.922, RP-250810, RP-253876
Technical focus:
HARQ operation, MIMO, waveform and modulation, frame structure, channel coding, spectrum utilization
Year:
2026
Location:
Gothenburg, Sweden
Topic:
6G Radio Access Technology, HARQ operations
Document type:
Draft report
Organization:
3GPP TSG RAN WG1
Author:
Moderator (OPPO)
Agenda item:
10.5.4.3
Purpose:
Discussion and Decision
Frequency ranges:
FR1, FR2-1, up to 52.6GHz
Technologies addressed:
Stand-alone 6G Radio (6GR), MIMO, HARQ, OFDM-based waveforms
Key considerations:
Energy efficiency, spectral efficiency, coverage, channel bandwidth, spectrum reuse, system simplification
Year:
2026
Date:
February 09–13, 2026
City:
Gothenburg
Country:
Sweden
Organization:
3GPP TSG RAN WG1
Meeting:
RAN WG1 #124
Source:
Moderator (OPPO)
Agenda item:
10.5.4.3
Document type:
Meeting discussion and decision document
Topic:
6G Radio (6GR) HARQ operation aspects
Technical domain:
Radio access technology and physical layer procedures
Technology scope:
6G radio access study and HARQ mechanisms
Frequency scope:
Up to 52.6 GHz including FR1 and FR2-1
Related technologies:
LTE, 5G NR, 6GR
Relevant standards references:
TR38.914, TR38.921, TR38.922, RP-253876, RP-250810
Document purpose:
Summary of contributions and discussion topics
Authoring role:
Meeting moderator
Year:
2026
Location:
Gothenburg, Sweden
Subject:
6G Radio Access Network, HARQ operations
Document Type:
Technical meeting draft / Discussion document
Organization:
3GPP TSG RAN WG1
Author:
Moderator (OPPO)
Agenda Item:
10.5.4.3
Intended Audience:
RAN1 working group members
Frequency Bands:
FR1 up to 7.125 GHz, FR1–FR2-1 (~7 GHz), FR2-1 (24.25–52.6 GHz)
Key Technologies:
Stand-alone 6GR architecture, OFDM waveforms, LDPC and Polar codes, MIMO, HARQ
Deployment Considerations:
Energy efficiency, spectral efficiency, cell-edge coverage, channel bandwidth ≥200 MHz
Date of Meeting:
February 09–13, 2026
Related Documents:
RP-253876, TR38.914, TR 38.921, TR 38.922, RP-250810
Decision Status:
Collected proposals and discussion outcomes
Provides:
Summary of HARQ-related study items and proposals for RAN1#124 meeting
Year:
2023
Region / City:
Athens, Greece
Topic:
IoT NTN, HARQ feedback
Document Type:
Discussion and decision
Organization / Institution:
3GPP
Author:
Moderator (Lenovo)
Target Audience:
3GPP members, technical experts
Effective Period:
2023-02-27 to 2023-03-03
Approval Date:
Not specified
Modification Date:
Not specified
Year:
2022
Region / City:
Electronic Meeting
Theme:
IoT NTN HARQ Enhancements
Document Type:
Report
Organization / Institution:
3GPP
Author:
CMC
Target Audience:
Companies involved in 3GPP discussions
Period of Validity:
2022-10-10 to 2022-10-19
Approval Date:
2022-10-18
Modification Date:
None
Meeting:
3GPP RAN WG2 Meeting #113e
Agenda Item:
8.10.2.2
Document Number:
R2-2102013e
Source:
InterDigital
Document Status:
Draft
Document For:
Discussion, Decision
Date:
January 25 – February 5, 2021
Topic:
HARQ timer behavior in Non-Terrestrial Networks
Technology:
5G NR
Specification References:
TS 38.321
Organizations Mentioned:
3GPP RAN WG2
Participating Companies:
APT, Panasonic, Huawei, HiSilicon, Lenovo, CATT, Spreadtrum, Samsung, Intel, MediaTek, LG, Nokia, OPPO, ZTE, Qualcomm, Xiaomi, Ericsson
Related Release:
Release 17
Deadlines:
February 1–2, 2021
Year:
2021
Region / city:
e-Meeting (Virtual)
Subject:
HARQ operation and enhancements for NB-IoT/eMTC over NTN
Document type:
Technical contribution / meeting report
Organization:
3GPP TSG RAN WG1
Author:
Moderator (Samsung)
Agenda item:
8.15.4
Purpose:
Discussion and decision on potential enhancements
Target audience:
RAN working group members
Reference documents:
RAN#91-e, RAN#92, TR 36.763
Year:
2020
Note:
Region / city
Topic:
HARQ process enhancement for NTN
Document type:
Meeting document
Organization:
3GPP TSG RAN WG1
Target audience:
Industry professionals, engineers
Year:
2020
Region / city:
Global
Topic:
HARQ enhancement for NTN
Document type:
Meeting Summary
Organization:
3GPP TSG RAN WG1
Author:
ZTE
Target audience:
3GPP participants, industry stakeholders
Action period:
2020
Approval date:
August 17th – 28th, 2020
Date of changes:
Not specified
Year:
2022
Meeting:
3GPP TSG-RAN WG2 #117-e
Meeting Type:
Electronic meeting
Meeting Period:
21 February – 3 March 2022
Agenda Item:
4.1
Document Number:
R2-2203572
Source:
Ericsson (Rapporteur)
Contact Person:
Emre A. Yavuz ([email protected]
Note:
)
Organization:
3GPP TSG-RAN WG2
Topic:
NB-IoT R15, 2 HARQ processes and HARQ RTT timer
Related Documents:
R2-2203480; R2-2203486; R2-2203495; R2-2203496
Document For:
Discussion, Decision
Scope:
Discussion of whether correction is needed and work on the related CRs
Intended Outcome:
Report and revised CRs if needed
Deadline:
24 February 2022 12:00 UTC
Type of Document:
Technical meeting report and discussion paper
Year:
2026
City:
Gothenburg
Country:
Sweden
Meeting:
3GPP TSG RAN WG1 #124
Agenda item:
10.5.4.3
Organization:
3GPP TSG RAN Working Group 1
Source:
Moderator (OPPO)
Document number:
R1-2601540
Document status:
Draft
Document for:
Discussion and Decision
Topic:
6G Radio (6GR) HARQ operation
Technical field:
Wireless communications and radio access technology
Related standards:
TR 38.914, TR 38.921, TR 38.922
Frequency scope:
Up to 52.6 GHz including FR1 and FR2-1
Key technologies:
HARQ, OFDM-based waveforms, LDPC, Polar Code, MIMO
Scope:
Physical layer control, data scheduling and retransmission mechanisms
Working group area:
RAN1 physical layer study for 6G radio access
Timeframe of meeting:
09–13 February 2026
Year:
2021
Organization:
3GPP TSG RAN WG1
Location:
e-Meeting
Document Type:
Technical Contribution
Topic:
HARQ Enhancements, IoT over NTN
Author/Source:
Moderator (Samsung)
Agenda Item:
8.15.4
Target Audience:
RAN1 Working Group Members
Study Period:
RAN#91-e to RAN#105-e
Release Reference:
Rel-17
Technical Reference:
TR 36.763
Year:
2021
Date:
April 12–20, 2021
Event:
3GPP TSG-RAN WG1 Meeting #104-bis-e
Agenda Item:
8.9.2
Document Type:
Technical meeting contribution
Organization:
3GPP TSG-RAN Working Group 1
Source:
Moderator (Ericsson)
Topic:
LTE-MTC enhancements for Release 17
Technical Area:
NB-IoT and LTE-MTC radio access technology
Feature:
Support of additional PDSCH scheduling delay for 14 HARQ processes in downlink
Subject:
HARQ-ACK delay determination methods
Alternatives Discussed:
Alt-1 expression based on subframe types; Alt-2 legacy absolute subframe approach
Companies Referenced:
Nokia, NSB, ZTE, Lenovo, Motorola Mobility
Purpose:
Discussion and Decision
Related Work Item:
Additional enhancements for NB-IoT and LTE-MTC
Standardization Context:
3GPP Release 17 development
Year:
2026
Region / city:
Gothenburg, Sweden
Topic:
6G Radio technology, HARQ operation
Document Type:
Draft
Organization:
3GPP TSG RAN WG1
Author:
Moderator (OPPO)
Target audience:
Researchers and engineers in telecommunications
Period of validity:
February 09-13, 2026
Approval date:
N/A
Date of changes:
N/A
Year:
2026
Region / City:
Gothenburg, Sweden
Theme:
6G Radio Access Technology, HARQ
Document Type:
Meeting Draft
Author:
Moderator (OPPO)
Target Audience:
RAN WG members, 6G researchers, telecommunications engineers
Period of Action:
February 09 – 13, 2026
Approval Date:
N/A
Date of Modifications:
N/A
Agenda Item:
10.5.4.3
Discussion Type:
Discussion and Decision
Scope:
6G Radio, HARQ Operations
Related Documents:
RP-253876, TR38.914, RP-250810, TR 38.921, TR 38.922
Technical Focus:
Hybrid Automatic Repeat Request (HARQ)
Network:
6G, LTE, NR
Standardization Area:
RAN
Contributions:
Technical proposals and outcomes for HARQ operations in 6GR
Year:
2026
Location:
Gothenburg, Sweden
Subject:
6G Radio Access, HARQ operation
Document type:
Draft contribution for working group meeting
Organization:
3GPP TSG RAN WG1
Author:
Moderator (OPPO)
Agenda item:
10.5.4.3
Purpose:
Discussion and Decision
Scope:
Frequency ranges up to 52.6 GHz, FR1 to FR2-1, 6GR standalone architecture
Standards referenced:
TR38.914, TR38.921, TR38.922, RP-250810, RP-253876
Technical focus:
HARQ operation, MIMO, waveform and modulation, frame structure, channel coding, spectrum utilization