№ files_lp_4_process_3_094316
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Technical proposal submitted to a 3GPP RAN3 meeting describing procedures for Mobility Robustness Optimization and failure analysis in Intra-CU and Inter-CU LTM mobility events within the 5G NR architecture defined in TS 38.401.
Organization:
3rd Generation Partnership Project (3GPP)
Working Group:
TSG-RAN WG3
Meeting:
3GPP TSG-RAN WG3 Meeting #131
Document Number:
R3-260718
Location:
Gothenburg, Sweden
Meeting Date:
09–13 Feb 2026
Agenda Item:
11.2.1
Specification:
TS 38.401
Topic:
Inter-CU LTM and MRO support
Document Type:
Technical Proposal
Contributing Companies:
Huawei; Nokia; Qualcomm; Lenovo
Contributing Operator:
China Unicom
Technical Domain:
5G Radio Access Network
Subject:
Mobility Robustness Optimization and LTM cell switch procedures between gNB-CU and gNB-DU
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Year:
2025
Region / City:
Bengaluru, Karnataka, India
Topic:
Wireless Access Backhaul
Document Type:
Change Request
Organ / Institution:
3GPP
Author:
Ericsson, ZTE, Nokia, Nokia Shanghai Bell, Huawei, Samsung, Lenovo, Qualcomm, Jio Platforms, Airbus, NEC, China Telecom, NTT DoCoMo
Target Audience:
Technical professionals in wireless communication
Period of Validity:
2025-09-11
Approval Date:
2025-09-11
Change Request Revision History:
Rev1: Revised based on additional RAN3#125-bis discussions. Rev2: Revised based on further additional RAN3#125-bis discussions. Rev3: Submitted to RAN3#126. Rev4: Submitted to RAN3#127. Rev5: Revised based on RAN3#127 agreements. Rev6: Rebased on TS 38.401 v18.5.0. Rev7: Revised based on RAN3#127-bis agreements. Rev8: Submitted to RAN3#128. Rev9: Rebased on TS 38.401 v18.6.0. Rev10: Revised based on RAN3#129 agreements.
Release:
Rel-19
Reason for Change:
To support Wireless Access Backhaul.
Clauses Affected:
2, 3.1, 3.2, 6.1.x (new), X (new), X.1 (new), X.2 (new), X.2.1 (new), X.2.2 (new), X.2.3 (new), X.3 (new), X.4 (new), X.5 (new), X.6 (new), X.7 (new), X.7.1 (new), X.7.2 (new), X.7.2.1 (new), X.8 (new).
Other specifications affected:
TS 38.300, TS 38.305, TS 38.455
Test specifications:
TS/TR … CR …
O&M Specifications:
TS/TR … CR …
Contextual Description:
A technical document detailing changes to 3GPP TS 38.401 to support Wireless Access Backhaul.
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
Event:
3GPP TSG-RAN WG3 Meeting #131
Location:
Gothenburg, Sweden
Dates:
09–13 February 2026
Agenda Item:
11.2.1
Document Identifier:
R3-260718
Title Reference:
TP for TS 38.401
Section Reference:
7.12 MRO support for LTM and Inter-CU LTM
Document Type:
Technical Proposal
Standardization Body:
3rd Generation Partnership Project (3GPP)
Working Group:
TSG-RAN WG3
Source Organizations:
Huawei; Nokia
Related Specification:
3GPP TS 38.401
Technical Domain:
5G Radio Access Network
Subject:
Mobility Robustness Optimization for LTM and Inter-CU LTM
Network Elements Mentioned:
gNB-CU, gNB-DU, UE
Protocols / Interfaces:
Xn interface
Change Scope:
Annex A proposal modifying clause 7.12
Year:
2026
Event:
3GPP TSG-RAN WG3 Meeting #131
Location:
Gothenburg, Sweden
Dates:
09–13 February 2026
Agenda Item:
11.2.1
Document ID:
R3-260718
Specification Reference:
3GPP TS 38.401
Section Reference:
7.12 MRO support for Intra-CU LTM and Inter-CU LTM
Document Type:
Technical proposal (TP)
Organizations:
Huawei; Nokia; Qualcomm; Lenovo
Technical Domain:
5G Radio Access Network (RAN)
Topic:
Inter-CU LTM mobility handling and failure analysis
Network Elements Mentioned:
gNB-CU; gNB-DU; UE
Interfaces Mentioned:
Xn
Related Procedures:
RLF reporting; Beam Failure Recovery (BFR); RACH-based access; LTM cell switch
Year:
2026
Region / City:
Gothenburg, SE
Topic:
Mobile network protocols
Document Type:
Technical Paper
Organization:
Huawei, Nokia, Qualcomm, Lenovo, China Unicom
Author:
Huawei, Nokia, Qualcomm, Lenovo, China Unicom
Target Audience:
Telecom engineers, network developers
Period of Validity:
Not specified
Approval Date:
Not specified
Date of Changes:
February 2026
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
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
Location:
Gothenburg, Sweden
Topic:
AI/ML-assisted mobile network handover
Document Type:
Draft report / pCR
Organization:
3GPP TSG-RAN WG3
Contributors:
Nokia, ZTE, Huawei, Lenovo
Agenda Item:
12.2.3
Target Audience:
Network engineers and standardization participants
Reference Standard:
TS 38.300
Meeting Number:
131
Period of Discussion:
9–13 February 2026
Year:
2026
Event:
3GPP TSG-RAN WG3 Meeting #131
Location:
Gothenburg, Sweden
Dates:
09–13 February 2026
Agenda Item:
11.2.1
Document Identifier:
R3-260718
Title Reference:
TP for TS 38.401
Section Reference:
7.12 MRO support for LTM and Inter-CU LTM
Document Type:
Technical Proposal
Standardization Body:
3rd Generation Partnership Project (3GPP)
Working Group:
TSG-RAN WG3
Source Organizations:
Huawei; Nokia
Related Specification:
3GPP TS 38.401
Technical Domain:
5G Radio Access Network
Subject:
Mobility Robustness Optimization for LTM and Inter-CU LTM
Network Elements Mentioned:
gNB-CU, gNB-DU, UE
Protocols / Interfaces:
Xn interface
Change Scope:
Annex A proposal modifying clause 7.12
Year:
2026
Location:
Goteborg, Sweden
Topic:
Telecommunications, 5G Core Network
Document type:
Change Request (CR)
Organization:
3GPP TSG-RAN WG3
Author:
CATT, Huawei, China Telecom, ZTE Corporation, CMCC
Work item code:
NR_Mob_enh2-CoreNR_Mob_Ph4-Core
Release:
Rel-1918
Category:
F (correction)
Date submitted:
2026-01-30
Clauses affected:
10.19.2, 10.7.2
Backward compatibility:
Not compatible
Related specifications:
Other core specifications, Test specifications, O&M specifications
Revision history:
Included in document
Contextual description:
Technical document detailing a change request for resolving ambiguity in SN Addition Request handling for Conditional Handover (CHO) and Inter-CU LTM within the 5G RAN specifications.
Year:
2026
Region / City:
Goteborg, Sweden
Topic:
Telecommunications, Network Architecture
Document Type:
Change Request (CR)
Organization / Institution:
3GPP, Huawei, China Telecom, ZTE Corporation, CMCC
Author:
3GPP RAN WG3
Target Audience:
Network Engineers, Telecommunications Specialists
Period of Validity:
Until next revision
Approval Date:
2026-01-30
Date of Changes:
2026-01-30
Release Version:
Rel-19
Work Item Code:
NR_Mob_enh2-CoreNR_Mob_Ph4-Core
Impact:
Non-backward compatible
Clauses Affected:
10.19.2, 10.7.2
Year:
2026
Event:
3GPP TSG-RAN WG3 Meeting #131
Location:
Gothenburg, Sweden
Dates:
09–13 February 2026
Agenda Item:
11.2.1
Document ID:
R3-260718
Specification Reference:
3GPP TS 38.401
Section Reference:
7.12 MRO support for Intra-CU LTM and Inter-CU LTM
Document Type:
Technical proposal (TP)
Organizations:
Huawei; Nokia; Qualcomm; Lenovo
Technical Domain:
5G Radio Access Network (RAN)
Topic:
Inter-CU LTM mobility handling and failure analysis
Network Elements Mentioned:
gNB-CU; gNB-DU; UE
Interfaces Mentioned:
Xn
Related Procedures:
RLF reporting; Beam Failure Recovery (BFR); RACH-based access; LTM cell switch
Year:
2026
Region / City:
Gothenburg, SE
Topic:
Mobile network protocols
Document Type:
Technical Paper
Organization:
Huawei, Nokia, Qualcomm, Lenovo, China Unicom
Author:
Huawei, Nokia, Qualcomm, Lenovo, China Unicom
Target Audience:
Telecom engineers, network developers
Period of Validity:
Not specified
Approval Date:
Not specified
Date of Changes:
February 2026
Year:
2026
Region / City:
Goteborg, Sweden
Topic:
Mobile Networks, SN Addition Request, CHO, Inter-CU LTM
Document Type:
Change Request
Organization:
3GPP TSG-RAN WG3
Author:
CATT, Huawei, China Telecom, ZTE Corporation, CMCC, Nokia, LG Electronics
Target Audience:
3GPP members, mobile network operators, equipment manufacturers
Effective Period:
2026-01-30
Approval Date:
2026-01-30
Modification Date:
None
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