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This report outlines the current status and future plans for network synchronization in TD-LTE systems deployed in the Asia-Pacific region, discussing solutions, technologies, and challenges in ensuring synchronization across adjacent frequency blocks in radio access networks.
Year:
2015
Region / City:
Asia-Pacific, Kyoto, Japan
Topic:
Network Synchronization Technologies in Radio Access Networks for IMT TDD Systems
Document Type:
Report
Organization / Institution:
APT Wireless Group (AWG)
Author:
APT Wireless Group
Target Audience:
Network engineers, telecommunications professionals, regulators
Period of Action:
Ongoing
Date of Approval:
March 13, 2015
Date of Modifications:
None
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Year:
2025
Region / City:
Bangalore, India
Topic:
IoT NTN TDD mode capability
Document Type:
Meeting Report
Organization / Institution:
3GPP TSG-RAN WG2
Author:
Samsung
Target Audience:
Industry experts and stakeholders in mobile communication
Period of Validity:
Not specified
Approval Date:
Not specified
Date of Modifications:
Not specified
Year:
2025
Region / city:
Bangalore, India
Topic:
IoT-NTN TDD
Document type:
Discussion paper
Organization:
3GPP TSG-RAN WG2
Author:
Toyota ITC
Target audience:
Participants of the 3GPP TSG-RAN WG2 meeting
Period of validity:
August 2025
Approval date:
August 2025
Modification date:
None
Deadline for feedback:
August 7th, 08:00 UTC
Note:
Contact information
Toyota ITC:
Claude Arzelier, Kai-Erik Sunell
Thales:
Flavien Ronteix Jacquet
Year:
2025
Location:
Bangalore, India
Topic:
IoT-NTN TDD, Stage 2 Change Requests
Document type:
Technical discussion document
Organization:
3GPP TSG-RAN WG2
Author:
Iridium Satellite LLC
Audience:
RAN2 members and contributing companies
Deadline for input:
August 1, 2025, 08:00 UTC
References:
RP-243293 (Madrid, Dec 2024), R1-2504883 (St. Julians, May 2025)
Contact persons:
Andjela Ilic-Savoia (Iridium), Yitao Mo (vivo), Zhihong Qiu (ZTE), Ping Yuan (Nokia), Xubin (Huawei, HiSilicon)
Scope:
Open issues related to Stage 2 CR for IoT-NTN TDD Rel-19 WI
Purpose:
Discussion and endorsement of proposed changes
Affected specifications:
TS 36.300, TS 36.102
Relevant bands:
1616–1626.5 MHz
Year:
2026
Event:
3GPP TSG RAN WG1 #124
Location:
Gothenburg, Sweden
Dates:
February 9–13, 2026
Agenda item:
8.7.2
Organization:
3GPP TSG RAN Working Group 1
Source:
Moderator (Qualcomm Incorporated)
Document identifier:
R1-2601468
Subject:
IoT NTN TDD mode scheduling and subframe definition
Technical area:
NB-IoT physical layer procedures
Related specification:
3GPP TS 36.213
Related contribution:
R1-2601098
Contributing companies mentioned:
Iridium, Cambridge Consultants, Nokia
Document type:
Technical discussion contribution
Purpose:
Discussion
Change proposal:
TP1-1
Key topic:
Definition and counting of subframes for scheduling delay in IoT NTN TDD mode
Affected procedures:
UE procedure for receiving NPDSCH
Proposed modification:
Replace counting of “DL subframes” with “subframes” for IoT NTN TDD scheduling delay
Consequence if not approved:
Potential misinterpretation of subframe counting and reduced scheduling flexibility
Year:
2026
Location:
Gothenburg, Sweden
Topic:
IoT NTN TDD scheduling and subframe definitions
Document type:
Technical report
Organization:
3GPP TSG RAN WG1
Author:
Qualcomm Incorporated
Audience:
Discussion participants in 3GPP working group
Agenda item:
8.7.2
Issue number:
1
Period of relevance:
February 9–13, 2026
Reference documents:
R1-2601098, TS 36.213, TS 36.211
Year:
2021
Date:
2021-02-02
Organization:
3rd Generation Partnership Project
Technical Group:
TSG RAN WG4
Meeting:
RAN WG4 Meeting #98-e
Document Type:
Change Request
Specification:
3GPP TS 38.101-4
Current Specification Version:
16.3.0
Release:
Rel-16
CR Number:
0131
Revision:
1
Category:
B (addition of feature)
Source to WG:
CMCC
Source to TSG:
R4
Work Item Code:
NR_UE_pow_sav-Perf
Affected Clauses:
5.3.2.2.3 (New); 5.3.3.2.3 (New)
Affected Specifications:
TS38.521-4
Technical Domain:
Radio Access Network
Subject:
Demodulation performance requirements for power saving UE in FR1 TDD using PDCCH DCI format 2_6
Test Scope:
FR1 TDD PDCCH monitoring and demodulation performance during DRX operation
Year:
2026
Region / city:
Gothenburg Metropolitan Area, Sweden
Theme:
Technical change request
Document type:
Change Request
Organization / institution:
3GPP
Author:
Ericsson
Target audience:
Technical experts, engineers, regulatory bodies
Period of action:
February 2026
Approval date:
2026-02-12
Date of changes:
2026-02-12
Summary:
The document outlines a change request to remove UTRA TDD from the MSR BS specifications due to the discontinuation of UTRA TDD production and its minimal deployment.
Year:
2026
Location:
Gothenburg Metropolitan Area, Sweden
Topic:
Telecommunications, Radio Access Network
Document type:
Change Request
Organization:
3GPP TSG-RAN4
Author:
Ericsson
Work item code:
AAS_BS_LTE_UTRA-Core, TEI17
Release:
Rel-17
Category:
F (correction)
Date submitted:
2026-02-12
Affected specifications:
37.104, 37.141, 37.145-1, 37.145-2
Clauses affected:
4.5, 6.7.2.3, 7.4.2.3, 7.5.2.2, 7.7.2, 9.7.6.3.3, 9.7.6.3.4, 9.7.6.4.4, 9.8.2.3, 10.5.2.3, 10.6.2.2, 10.6.3.2, 10.6.4.2, 10.8.2
Reason for change:
UTRA TDD is no longer produced and deployments are minimal, making previous co-existence requirements obsolete
Consequences if not approved:
Outdated requirements for UTRA TDD co-existence would remain in AAS BS specifications
Revision history:
R1 – Removal of references to UTRA TDD requirements in tables of 4.3.4.5
Regional requirements:
Certain specifications apply differently depending on local regulations, including operating bands, emission limits, and blocking requirements
Source to WG:
Ericsson
Source to TSG:
R4
Year:
2026
Location:
Gothenburg Metropolitan Area, Sweden
Document type:
Change Request
Standard:
3GPP TS 37.105
Work item code:
AAS_BS_LTE_UTRA-Core, TEI17
Source organization:
Ericsson
Target group:
3GPP R4
Release:
Rel-19
Revision:
1
Date submitted:
2026-02-12
Affected clauses:
4.5, 6.7.2.3, 7.4.2.3, 7.5.2.2, 9.7.6.4.4, 9.8.2.3, 10.5.2.3, 10.8.2
Affected specifications:
37.104, 37.141, 37.145-1, 37.145-2
Category:
F (correction)
Reason for change:
UTRA TDD is no longer produced and deployments are minimal
Summary:
Removes co-existence and colocation requirements with UTRA TDD from the base station specification, including spurious emissions, intermodulation, and receiver blocking
Regional applicability:
Some requirements apply only in certain regions as specified by local regulations
Date of implementation:
2026
Year:
2026
Location:
Gothenburg Metropolitan Area, Sweden
Document type:
Change Request
Organization:
3GPP TSG-RAN4
Author:
Ericsson
Work item code:
AAS_BS_LTE_UTRA, TEI17
Release:
Rel-17
Category:
F (correction)
Date of issue:
2026-02-12
Affected clauses:
4.4, 5.2, 5.3.2, 6.6.3.5.3, 6.7.5.1.3, 7.4.5.1.3, 7.5.5.1.2, 7.5.5.2, 7.5.5.3.2, 7.5.5.4.2, 7.7.5.1
Other affected specifications:
37.104, 37.105, 37.141, 37.145-2
Regional applicability:
Certain requirements apply depending on local or regional regulation
Consequences if not approved:
Unnecessary requirements for UTRA TDD co-existence would remain in the AAS BS specification
Year:
2026
Location:
Gothenburg Metropolitan Area, Sweden
Subject:
Radio Access Network change request
Document type:
Change Request
Organization:
3GPP TSG-RAN4
Author:
Ericsson
Work item code:
AAS_BS_LTE_UTRA, TEI17
Release:
Rel-17
Category:
F (correction)
Date submitted:
2026-02-12
Clauses affected:
4.4, 5.2, 5.3.2, 5.4, 6.7.6.4.5, 6.7.6.5.5, 6.8.5.1.3, 7.5.5.1.3, 7.6.3.5, 7.8.5.1
Other specifications affected:
37.104, 37.105, 37.141, 37.145-1
Att.1 – TDD update (TG-FakeMed) for AI-based detection of falsified medicine, Study Period 2017-2020
Year:
2021
Organization:
International Telecommunication Union, Telecommunication Standardization Sector
Study Period:
2017-2020
WG(s):
Plen
Meeting:
Online, 19-21 May 2021
Source:
TG-FakeMed Topic Driver
Document Type:
Topic Description Document (TDD)
Author / Contact:
Frank Verzefé, TrueSpec-Africa, DRC, [email protected]
Focus:
AI for detection of substandard and falsified medical products
Purpose:
Discussion and development of AI benchmarking methods
Abstract:
Description of objectives, methodology, data structure, and benchmarking approach for AI in detecting falsified medicines
Scope:
Global, with emphasis on public health impact and data collection from LMICs
Ethical Considerations:
Data quality, accuracy, database management, and impact assessment
Date:
2025-11-03
Note:
Author(s)
Year:
2025
Region / city:
Global
Topic:
Wireless LAN standards
Document type:
Draft specification
Organization / institution:
IEEE
Author:
Multiple authors from different companies
Target audience:
Engineers and researchers in wireless communications
Period of validity:
N/A
Approval date:
N/A
Amendment date:
N/A
Note:
Year
Year:
2025
Note:
Region / City
Topic:
Wireless LANs, NPCA synchronization
Document Type:
Technical standard
Institution:
IEEE
Author:
Seongho Byeon, Salvatore Talarico, Dongju Cha, Zhenpeng Shi, Juseong Moon, Inaki Val, Shubhodeep Adhikari, Matthew Fischer, Ning Gao, Xiaofei Wang, Kaiying Lu
Target Audience:
Engineers, Standards Committee Members, Wireless Communication Researchers
Context:
A technical document that outlines resolutions for comment IDs related to NPCA synchronization mechanisms in wireless LAN standards.
Year:
2016
Note:
Region / City
Theme:
Clock Synchronization
Document Type:
Technical Standard
Organization / Institution:
LXI Consortium
Target Audience:
Developers, Engineers, and Technical Experts
Approval Date:
8 November 2016
Year:
2021
Region / City:
West Lafayette
Topic:
Educational Technology
Document Type:
User Guide
Institution:
Purdue University
Author:
ITAP
Target Audience:
Faculty, Course Administrators
Effective Period:
Not specified
Approval Date:
6/18/2021
Modification Date:
Not specified
Year:
2021
Period:
January 25 – February 5
Organization:
3GPP TSG RAN WG1
Document Type:
Technical report / meeting summary
Source:
Moderator (MediaTek)
Agenda Item:
8.4.3
Audience:
Discussion and Decision participants
Focus:
UL synchronization and GNSS-assisted pre-compensation in IoT NTN
Related Documents:
TR 36.763, TR 38.821, NR NTN agreements
Year:
2020
Note:
Region / city
Topic:
Time and frequency synchronization, NR NTN
Document type:
Meeting agenda
Organization / institution:
3GPP TSG-RAN WG1
Author:
Thales
Target audience:
Participants of 3GPP TSG-RAN WG1
Year:
2020
Event:
TSG-RAN WG1 Meeting #102-e
Topic:
UL time and frequency synchronization for NR NTN
Document type:
Technical contribution / meeting report
Organization:
3GPP
Author:
Thales (moderator)
Contributors:
MediaTek, CATT, Ericsson, InterDigital, CMCC, ZTE, Apple, CAICT, Sony, LG Electronics
Target audience:
3GPP RAN1 working group members
Agenda item:
8.4.2
Sections:
Clarification on UE capability; UL timing synchronization; UL frequency synchronization; Serving satellite ephemeris; References
Scope:
NR NTN Rel-17 solutions
Date of meeting:
August 17–28, 2020