№ files_lp_4_process_1_47200
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This document is a technical change request detailing a correction to a timer issue in the 3GPP specification related to the inter-SN LTM procedure for specific network elements in mobile telecommunications.
Year:
2026
Region / City:
Gothenburg, Sweden
Topic:
UICC apps, ME, Radio Access Network, Core Network
Document Type:
Change Request
Organization / Institution:
3GPP TSG-RAN WG3
Author:
Google, Huawei, Ericsson, Nokia, LG Electronics, NEC, CATT, ZTE, Samsung, China Telecom, Qualcomm, Ofinno
Target Audience:
Technical experts, telecom network engineers
Period of validity:
2026-01-30 to 2026-02-13
Approval Date:
2026-01-30
Revision Date:
2026-01-30
Release:
Rel-19
Category:
F (correction)
Work item code:
NR_Mob_Ph4-Core
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Year:
2026
Region / city:
Gothenburg, Sweden
Topic:
Timer issue correction for inter-SN LTM
Document type:
Change Request
Organization:
3GPP
Author:
Google, Huawei, Ericsson, Nokia, LG Electronics, NEC, CATT, ZTE, Samsung, China Telecom, Qualcomm, Ofinno, NTT DoCoMo
Target audience:
Technical working groups, network engineers, 3GPP members
Period of validity:
2026-02-09 to 2026-02-13
Approval date:
Pending
Modification date:
None
Impact Analysis:
This change has isolated impact from the previous specification version, affecting only the timer and LTM procedure.
Consequences if not approved:
The MN may incorrectly release the SN due to timer expiration for LTM.
Year:
2026
Region / city:
Goteborg, Sweden
Topic:
Technical change request
Document type:
Change Request
Organization / institution:
3GPP
Author:
Samsung, Huawei, Ericsson, Nokia, Google, ZTE, LG Electronics, NEC, CATT, Qualcomm, Ofinno, Lenovo, ChinaTelecom
Target audience:
3GPP Working Group
Period of validity:
February 9-13, 2026
Approval date:
2026-01-29
Date of changes:
2026-01-29
Release:
Rel-19
Work item code:
NR_Mob_Ph4-Core
Category:
F
Reason for change:
Clarification and modification of the TA information transfer procedure for inter-SN SCG LTM scenario
Clauses affected:
8.6.2.2, 9.1.5.4, 9.3.5, 9.3.7
Other specifications affected:
Core network specifications
Impact analysis:
Isolated impact on inter-SN SCG LTM procedure, backward-compatible
Consequences if not approved:
TA information transfer may fail in inter-SN SCG LTM scenario
Test specifications:
Not mentioned
O&M specifications:
Not mentioned
Other comments:
None
Year:
2009
Region / city:
N/A
Topic:
Power Management, Software Development
Document Type:
White Paper
Organization:
Microsoft Corporation
Author:
Microsoft Corporation
Target Audience:
Software developers, system administrators, hardware engineers
Effective Period:
N/A
Approval Date:
January 20, 2009
Modification Date:
N/A
Year:
2022
Meeting:
3GPP TSG-RAN WG2 Meeting #119bis-e
Dates:
10th–19th October 2022
Location:
Online
Agenda Item:
6.10.4.2
Source Organization:
Samsung
Contributing Organizations:
Samsung Research America; Apple; Huawei; HiSilicon; Sequans Communications; Ericsson; ASUSTeK; Xiaomi
3GPP Release:
Rel-17
Technical Area:
NR Non-Terrestrial Networks (NR-NTN)
Specification Reference:
TS 38.331
Document Type:
Technical discussion paper
Document Purpose:
Discussion and decision
Subject:
Epoch time handling and validity timer T430 for NR-NTN UL synchronization
Target Audience:
3GPP RAN2 participants
Standards Body:
3GPP
Year:
2019
Region / City:
San Jose, CA
Topic:
Wireless LANs, EDCA, MU EDCA Timer
Document Type:
Technical Paper
Organization / Institution:
IEEE
Author:
Zhou Lan, Chunyu Hu, Matthew Fischer, Laurent Cariou, Chittabrata Ghosh, Jarkko Kneckt
Target Audience:
Wireless Networking Engineers, IEEE Members
Period of Validity:
N/A
Approval Date:
2019-05-10
Date of Changes:
N/A
Year:
2023
Region / City:
National
Topic:
Swimming Championship
Document Type:
Registration Form
Organization / Institution:
YMCA
Author:
YMCA
Target Audience:
Volunteers for swimming events
Effective Period:
July 2023
Approval Date:
Not specified
Revision Date:
Not specified
Context:
A registration form for volunteers participating in the YMCA National Long Course Swimming Championship.
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:
2022
Organization:
3GPP TSG-CT WG1
Document type:
Change Request (CR)
Work item code:
5MBS
Source:
MediaTek Inc.
Release:
Rel-17
Category:
B (addition of feature)
Affected components:
UICC apps, ME, Radio Access Network, Core Network
Clauses affected:
6.3.2.3
Revision:
1
Date of submission:
2022-01-18
Year:
2026
Region / city:
Gothenburg, Sweden
Topic:
Timer issue correction for inter-SN LTM
Document type:
Change Request
Organization:
3GPP
Author:
Google, Huawei, Ericsson, Nokia, LG Electronics, NEC, CATT, ZTE, Samsung, China Telecom, Qualcomm, Ofinno, NTT DoCoMo
Target audience:
Technical working groups, network engineers, 3GPP members
Period of validity:
2026-02-09 to 2026-02-13
Approval date:
Pending
Modification date:
None
Impact Analysis:
This change has isolated impact from the previous specification version, affecting only the timer and LTM procedure.
Consequences if not approved:
The MN may incorrectly release the SN due to timer expiration for LTM.
Note:
Year
Theme:
Timing Instructions
Document Type:
Manual
Target Audience:
Timer personnel, event organizers
Event:
Swimming competitions
Year:
Not specified
Region / City:
Not specified
Subject:
Electronics, Circuit Design
Document Type:
Technical Manual
Organization / Institution:
Not specified
Author:
Not specified
Target Audience:
Electronics enthusiasts, engineers
Period of Action:
Not specified
Approval Date:
Not specified
Modification Date:
Not specified
Year:
2026
Institution:
University / Training Center (unspecified)
Course:
System-on-Chip Design
Type:
Laboratory Manual
Target Audience:
Students and engineers learning SoC implementation
Hardware:
Diligent BASYS 3 FPGA, VGA monitor, switches, LEDs
Software:
Xilinx Vivado, Keil uVision, TeraTerm
Processor:
ARM Cortex-M0
Peripherals:
Timer, GPIO, 7-Segment Display, UART, VGA
Memory:
BRAM 16MB
Bus:
AHB-Lite
Learning Objectives:
Implement and debug SoC peripherals, modify assembly code, display timer values
Lab Number:
7
Issue:
1.0
Extension Tasks:
Additional timer modes, GPIO mask register, 7-segment display modes
Year:
2025
Region / city:
Wuhan, China
Topic:
Inter-CU LTM in 5G networks
Document type:
Meeting agenda and summary
Organization / institution:
3GPP TSG RAN WG3
Author:
China Telecom
Target audience:
3GPP members, telecom companies
Effective period:
2025
Approval date:
7th April 2025
Modification date:
None specified
Year:
2023
Note:
Region / city
Topic:
Timing Advance management for LTM
Document type:
Meeting summary
Organization / institution:
3GPP
Author:
Moderator (CATT)
Target audience:
Technical stakeholders in the telecommunications industry
Year:
2023
Location:
Athens, Greece
Subject:
3GPP RAN2 LTM RRC configuration
Document type:
Technical progress report
Organization:
3GPP TSG-RAN WG2
Author:
Ericsson
Intended audience:
RAN2 members, telecom engineers
Meeting number:
121
Discussion topics:
Reference configuration, LTM candidate configuration, RRC procedures, UE actions, configuration application options
Year:
2025
Region / City:
Dallas, USA
Topic:
5G Network, Uplink DM-RS, RACH-less LTM
Document Type:
Change Request
Organization / Institution:
3GPP TSG-RAN WG1
Author:
Ofinno
Target Audience:
Technical experts, network engineers, RAN professionals
Period of validity:
November 17th – 21st, 2025
Approval Date:
2025-11-19
Modification Date:
N/A
Meeting:
3GPP TSG RAN WG2#125bis
Document number:
R2-240xx
Location:
Changsha, China
Date:
15th - 19th April 2024
Release:
Rel-19
Work Item:
NR_Mob_Ph4-Core
Source:
Apple
Target group:
SA WG3
Cc:
RAN WG3
Contact person:
Naveen Palle
Attachment:
None
Related specifications:
Rel-18 LTM, Rel-18 S-CPAC
Subject:
Security key handling options for inter-CU LTM without DC
Options discussed:
Option 1, Option 1A, Option 1B, Option 2, Option 3, Option 3A, Option 3B, Option 4, Option 5
Next meetings:
TSG RAN WG2 Meeting #126 (20 - 24 May 2024, Fukuoka, Japan); TSG RAN WG2 Meeting #127 (19 - 23 Aug 2024, Maastricht, Netherlands)
Year:
2026
Region / City:
Gothenburg, SE
Topic:
Change Request
Document Type:
Technical Specification
Organization:
3GPP
Author:
Huawei, Nokia, LG Electronics, ZTE, Ofinno, Jio Platforms, CMCC, Ericsson, Lenovo, NEC, NTT DoCoMo, Qualcomm, Samsung, Google, China Telecom
Target Audience:
Members of 3GPP TSG-RAN WG3
Effective Period:
2026-02-12 to ongoing
Approval Date:
2026-02-12
Date of Changes:
2026-02-12
Work Item Code:
NR_Mob_Ph4-Core
Release:
Rel-19
Category:
F (correction)
Clauses Affected:
8.6.1
Other Specifications:
TS38.473CR 1676
Impact:
Functional modification under isolated impact
Summary:
The change request clarifies the procedural text for enabling the candidate gNB-DU to properly provide CSI reporting configuration for CSI acquisition and CSI-IM measurement based on the existing CSI resource configuration in the LTM Configuration Update message.
Reason for Change:
To introduce a procedure for LTM Configuration Update to enable the correct feedback of CSI Report Configuration for CSI Acquisition and CSI-IM measurement.
Other Comments:
Revision history available
Year:
2026
Region / City:
Gothenburg, SE
Subject:
Telecommunication standards, 3GPP, RLF, LTM
Document Type:
Technical Paper
Organization / Institution:
3GPP TSG-RAN WG3
Author:
Huawei, Nokia, Qualcomm, Lenovo
Target Audience:
Telecommunication engineers, researchers, network specialists
Period of Validity:
Ongoing
Approval Date:
February 2026
Revision Date:
N/A
Year:
2026
Region / City:
Gothenburg, SE
Topic:
Telecommunication
Document Type:
Change Request
Organization / Institution:
3GPP
Author:
Huawei, Nokia, Offinno, Jio Platforms, CMCC, NEC, LG Electronics, Google
Target Audience:
3GPP Working Group
Period of Validity:
2026
Approval Date:
2026-02-12
Amendment Date:
N/A
Work Item Code:
NR_Mob_Ph4-Core
Release:
Rel-19
Category:
F (Correction)
Clauses Affected:
9.1.5.1
Impact Analysis:
Isolated protocol and functional impact
Consequences if Not Approved:
Ambiguities in the specification