№ files_lp_4_process_1_47201
File format: docx Character count: 1491 File size: 33 KB
Year: 2026
Region / City: Gothenburg, SE
Subject: MRO, intra-CU CLTM
Document Type: Liaison Statement
Organ / Institution: 3GPP RAN3
Author: Xufei Dong
Target Audience: 3GPP RAN2
Period of Validity: Until further notice
Approval Date: 9th - 13th Feb, 2026
Date of Changes: Not specified
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RACH-based intra-frequency PCell L1 triggered CLTM cell switch from FR1 to FR1 test case
Year: 2025
Region / City: Dallas, US
Subject: Change Request
Document Type: Technical Specification
Organization / Institution: 3GPP
Author: China Telecom
Target Audience: TSG RAN Working Group 4
Effective Period: October 2025 - November 2025
Approval Date: 2025-11-05
Release: Rel-19
Change Category: B (addition of feature)
Work Item Code: NR_Mob_Ph4-Perf
Date of Change Request: 2025-11-05
[draft] LS on MRO for intra-CU CLTM
Year: 2026
Region / City: Gothenburg, SE
Topic: MRO for intra-CU CLTM
Document Type: Liaison Statement
Organization / Institution: 3GPP
Author: RAN3
Target Audience: RAN2
Action Required: Feedback from RAN2
Period of Validity: February 9-13, 2026
Approval Date: February 9, 2026
Date of Changes: None
Context: This document is a liaison statement from RAN3 to RAN2 regarding the MRO for intra-CU CLTM in the context of 5G NR development, seeking feedback from RAN2 on the proposed solutions for outdated TA during reestablishment.
TP for TS 38.401: MRO Support for LTM and Inter-CU LTM (3GPP TSG-RAN WG3 Meeting #131, Gothenburg, 09–13 Feb 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
[draft] LS on MRO for intra-CU CLTM
Year: 2026
Region / City: Gothenburg, SE
Topic: MRO for intra-CU CLTM
Document Type: Liaison Statement
Organization / Institution: 3GPP
Author: RAN3
Target Audience: RAN2
Action Required: Feedback from RAN2
Period of Validity: February 9-13, 2026
Approval Date: February 9, 2026
Date of Changes: None
Context: This document is a liaison statement from RAN3 to RAN2 regarding the MRO for intra-CU CLTM in the context of 5G NR development, seeking feedback from RAN2 on the proposed solutions for outdated TA during reestablishment.
Clean-up for Intra-CU topology adaption procedure
Year: 2020
Region / City: Online
Topic: Intra-CU topology adaptation procedure
Document Type: Technical Report
Organization / Institution: 3GPP TSG-RAN WG3
Author: CATT, ZTE, HW, KDDI, LG, QC
Target Audience: Telecommunications engineers, network operators
Period of Validity: N/A
Approval Date: N/A
Amendment Date: N/A
3GPP TSG-RAN WG3 #131 UE Context Modification Procedure for Conditional Intra-CU LTM, Goteborg, Sweden, 9–13 February 2026
Year: 2026
Location: Goteborg, Sweden
Topic: 5G NR UE Context Management and LTM Procedures
Document Type: Technical Specification Contribution
Organization: 3GPP TSG-RAN WG3
Authors: CATT, Nokia, Qualcomm
Intended Audience: 3GPP Members and 5G NR Network Equipment Engineers
Agenda Item: 11.2.2
Period Covered: February 2026
Message Types Covered: UE CONTEXT MODIFICATION REQUEST, UE CONTEXT MODIFICATION RESPONSE
Technical References: TS 38.473, TS 38.401, TS 23.501, TS 38.300, TS 38.331
Procedures Described: UE Context Modification, DRB setup/modification, Mobility Issue Handling, QoS Flow Monitoring, Transmission Action Handling
Further Discussion on AI/ML Assisted Intra-CU LTM — pCR to TR 38.745, RAN3#131 (9–13 February 2026)
Year: 2026
Location: Gothenburg Metropolitan Area, Sweden
Event: 3GPP TSG-RAN WG3 Meeting #131
Agenda Item: 12.2.2
Organization: 3rd Generation Partnership Project (3GPP)
Working Group: TSG-RAN WG3
Source Organization: Huawei
Document Type: pCR (proposed Change Request)
Target Specification: TR 38.745
Specification Version Base: TR 38.745 V1.1.0 (2026-02)
Technical Domain: Telecommunications Engineering
Technology Context: 5G New Radio
Topic: AI/ML-assisted intra-CU LTM optimization
Key Concepts: Artificial Intelligence, Machine Learning, intra-CU LTM, mobility management, beam selection, uplink synchronization
Input Data Sources: local node measurements, UE measurement reports, mobility history, radio resource status, UE trajectory prediction
Output Data Elements: predicted candidate cell and beam, target cell and beam selection, predicted TA values, predicted timing for cell switch and early UL synchronization
Feedback Data: LTM target cell and beam per switch event, measured TA values, SON reports, actual timing of cell switch and early synchronization
Approval Context: Agreements reached at RAN3#131
[draft] LS on MRO for intra-CU CLTM
Year: 2026
Region / City: Gothenburg, SE
Topic: MRO for intra-CU CLTM
Document Type: Liaison Statement
Organization / Institution: 3GPP
Author: RAN3
Target Audience: RAN2
Action Required: Feedback from RAN2
Period of Validity: February 9-13, 2026
Approval Date: February 9, 2026
Date of Changes: None
Context: This document is a liaison statement from RAN3 to RAN2 regarding the MRO for intra-CU CLTM in the context of 5G NR development, seeking feedback from RAN2 on the proposed solutions for outdated TA during reestablishment.
Topics: CLTM MRO Intra-CU