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Technical source detailing updates to the FS_ULBC permanent document, specifying simulation parameters, transport mechanisms, and end-to-end modeling for IMS voice calls over NB-IoT via GEO satellite in alignment with 3GPP TR 23.700-19.
Year:
2025
Region / City:
Global / 3GPP Members
Subject:
Telecommunications; NB-IoT; IMS Voice; GEO Satellite
Document Type:
Technical contribution / Agreement
Organization:
3GPP, vivo Mobile Communication Co.
Authors:
Contributors from vivo, China Mobile, MediaTek, ZTE, Verizon, Ericsson, CATT, Nokia, Skylo, Thales, China Telecom, Spreadtrum, Xiaomi, OPPO, China Unicom, LG Electronics, Apple, Samsung, NTT DOCOMO, CSCN, SHARP
Target Audience:
3GPP Working Groups RAN1, RAN2, SA2, SA4
Period of Effect:
2025 – until next update
Approval Date:
August 2025
References:
3GPP TR 23.700-19, TS 26.132, TR 36.321, TR 36.763, TR 38.811, TR 38.821, FS_ULBC Tdocs
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Year:
2025
Region / City:
Online
Topic:
AI Codec Complexity, Mobile Devices
Document Type:
Discussion Paper
Organization / Institution:
3GPP TSG-SA WG4
Author:
vivo
Target Audience:
Industry professionals, engineers, researchers
Period of Validity:
N/A
Approval Date:
N/A
Date of Changes:
N/A
Year:
2024
Region / city:
N/A
Topic:
Ultra-low bit rate codec for voice over GEO
Document type:
Study report
Organization / institution:
3GPP
Author:
N/A
Target audience:
Technical experts in voice codecs and GEO satellite communication
Period of validity:
N/A
Approval date:
March 2024
Amendment date:
N/A
Year:
2025
Region / City:
Fukuoka, Japan
Topic:
Speech Codec Testing
Document Type:
Discussion and Agreement
Organization:
3GPP SA4
Author:
Dolby Laboratories Inc., Novamint
Target Audience:
Technical experts in speech codecs
Effective Period:
May 2025
Approval Date:
Not specified
Modification Date:
Not specified
Year:
2025
Region / City:
Online
Topic:
Codec Design, AI, Speech Processing
Document Type:
Discussion Paper
Organization / Institution:
Dolby Laboratories Inc., Nokia, Xiaomi Technology, Orange
Author:
Not specified
Target Audience:
3GPP working groups, codec developers
Period of Validity:
2025
Approval Date:
Not specified
Date of Changes:
Not specified
Note:
Context description
Year:
2025
Region / City:
Japan, Fukuoka
Topic:
Ultra-low bit rate speech codecs, Test methodologies
Document Type:
Discussion and Agreement
Organization:
3GPP SA4
Author:
Dolby Laboratories Inc., Novamint
Target Audience:
Engineers and researchers in speech coding
Period of Validity:
N/A
Approval Date:
N/A
Date of Changes:
N/A
Source:
Rapporteur FS_ULBC
Version:
0.12.20
Agenda item:
7.9
Document for:
Agreement
Revision history:
0.1.0–0.2.0 (2025-05-23 to 2025-07-25)
Meetings:
SA4#132, SA4#133-e
Related TR:
3GPP TR 26.940 “Study on Ultra Low Bitrate Speech Codecs”
Related specifications:
3GPP TS 26.132; 3GPP TR 38.811; 3GPP TR 38.821; TR 36.321; 3GPP TR 36.763
Study item reference:
SP-250378 “SID on Ultra Low Bitrate Speech Codec”
Scope:
Ultra-low bit rate speech codec for voice over Geostationary Orbit (GEO) satellites
Working group:
3GPP SA4
Scenario focus:
IMS Voice Call over GEO
Technical aspects:
Bit rates; sample rate and audio bandwidth; frame length; complexity and memory demands; algorithmic delay; packet loss concealment; discontinuous transmission; speech quality; robustness to non-speech input
Channel assumptions:
Limited data rate (1–3 kbit/s); GEO satellite access; increased uplink and downlink delay; transmission errors
Coordination:
SA2, RAN, CT1 and other 3GPP groups
Document type:
Permanent document (p-doc) supporting a Technical Report
Version:
0.45.0
Year:
2025
Region / City:
Global
Theme:
Ultra-Low Bitrate Communication for Voice over GEO Satellites
Document Type:
Technical Report
Organization / Institution:
3GPP
Author:
Not specified
Target Audience:
3GPP Working Groups, Telecom Engineers
Effective Period:
Ongoing
Approval Date:
2025-05-23
Date of Changes:
2026-02-xx03
Context:
A technical document outlining the study and development of ultra-low bitrate speech codecs for voice communication via geostationary satellites, including performance requirements, test methodologies, and application scenarios.
Year:
2026
Location:
Goa, India
Topic:
Ultra Low Bitrate Speech Codec Feasibility Study
Document Type:
Meeting Report / Study Plan
Organization:
3GPP TSG-SA WG4
Source:
China Mobile
Version:
0.65
Agenda Item:
16.27.8
Purpose:
Discussion and Agreement
Scope:
IMS Voice Call over GEO, Multi-Party Voice Communication, Vehicle Emergency Call Communication
Performance Metrics:
Speech quality, intelligibility, conversational quality, complexity, memory demands, algorithmic delay, PLC, noise suppression, DTX
Related Documents:
TR 22.887, Annex A Living Document, TR sections 4–9
Coordination:
SA2, RAN, CT1, other relevant 3GPP working groups
Timeline:
March 2025 – February 2026
Meetings:
SA4#131-bis-e, SA4#132, SA4#135, SA4#136, Audio SWG telco, TSG SA#107
Testing:
Subjective and objective methodologies, codec evaluation under clean and noisy conditions, GEO channel simulations
Year:
2025–2026
Region / City:
Global / 3GPP Collaboration
Subject:
Ultra Low Bitrate Speech Codec (ULBC) for GEO Satellite Voice Services
Document Type:
Technical Report / Working Document
Organization:
3GPP SA4 Working Group
Author:
FS_ULBC Rapporteur Team
Target Audience:
Telecom engineers, standardization participants
Revision History:
Detailed per version from 0.1.0 to 0.6.0 including clause updates, simulation models, and design considerations
Applicable Standards:
3GPP TR 26.940, TS 26.132, TR 38.811, TR 38.821, TS 23.700-19
Scope:
ULBC design constraints, simulation methodologies, performance requirements, interoperability with IMS voice over GEO NTN
Methodology:
Clause-based updates, simulation results, reference codecs analysis, complexity and memory evaluation, design constraints validation
Related Contributions:
SP-250378, Tdoc S4-251390, S4aA250058, S4aA250259, S4aA250069, S2-2509293
Implementation Period:
Drafting and updates between May 2025 and February 2026
Additional Notes:
Excludes NB-IoT impacts; coordinates with multiple 3GPP groups
Year:
2026
Region / city:
Goa, India
Topic:
Feasible bitrates, NTN-TDL-C channel model
Document type:
Technical paper
Organization:
Qualcomm Incorporated, Xiaomi
Author:
Qualcomm Incorporated
Target audience:
SA4 working group members, 3GPP participants
Effective period:
February 9-13, 2026
Approval date:
Not provided
Date of changes:
Not provided
Year:
2026
Region / City:
Goa, India
Topic:
IMS signaling transport for GEO NB-IoT NTN access
Document Type:
Meeting Contribution
Organization / Institution:
3GPP
Author:
vivo
Target Audience:
3GPP TSG-SA WG2 members
Period of validity:
February 2026
Approval Date:
Not specified
Modification Date:
Not specified
Agenda Item:
20.1.1
Work Item / Release:
FS_5GSAT_Ph4_ARC / Rel-20
Abstract:
Updated conclusion on IMS signaling transport for GEO NB-IoT NTN access
Context:
Document proposing conclusions on IMS signaling transport for GEO NB-IoT NTN access.
Year:
2025
Region / city:
Göteborg, SE
Theme:
IMS voice call optimization via NB-IoT GEO
Document Type:
Technical Specification
Organization:
Huawei, HiSilicon, China Telecom, CSCN
Author:
Not specified
Target Audience:
Telecom engineers, 3GPP members
Period of validity:
Not specified
Approval Date:
Not specified
Date of Changes:
Not specified
Year:
2026
Region / City:
Goa, India
Theme:
Telecommunications
Document Type:
Meeting Conclusion
Organization:
3GPP TSG-WG SA2
Author:
Huawei, HiSilicon
Target Audience:
Telecommunications professionals, engineers, and network operators
Period of validity:
N/A
Approval Date:
9th Feb 2026
Amendment Date:
N/A
Year:
2026
Location:
Goa, India
Topic:
IMS enhancement for GEO NB-IoT NTN access
Document type:
Meeting contribution / Technical report
Organization:
3GPP TSG-WG SA2
Author:
Huawei, HiSilicon
Audience:
3GPP members, telecom engineers
Agenda item:
20.1.1
Work item / Release:
FS_5GSAT_Ph4-ARC / Rel-20
Reference document:
TR 23.700-19 v1.1.0
Meeting number:
#173
Date:
9–13 February 2026
Summary:
Interim conclusions for Key Issue #2 on IMS enhancement for GEO NB-IoT NTN access including SIP message size reduction, shortened call setup, and B2BUA interoperation
Year:
2026
Region / city:
Goa, India
Topic:
IMS Voice over GEO Satellite
Document Type:
Specification
Organization:
3GPP
Author:
Nokia
Target audience:
3GPP members
Period of validity:
N/A
Approval date:
N/A
Modification date:
N/A
Year:
2026
Location:
Goa, India
Subject:
IMS enhancement for GEO NB-IoT NTN access
Document Type:
Meeting contribution / Technical conclusion
Organization:
3GPP TSG-WG SA2
Author:
Huawei, HiSilicon
Agenda Item:
20.1.1
Work Item / Release:
FS_5GSAT_Ph4-ARC / Rel-20
Purpose:
Approval
Reference Document:
TR 23.700-19 v1.1.0
Interim Conclusions:
SigComp, SIP header slimming, SDP preconfiguration, shortened call setup, B2BUA support, dedicated bearer for IMS voice data
Year:
2026
Region / city:
Goa, India
Topic:
Change request for GEO voice data transport
Document Type:
Change Request
Organization:
3GPP
Author:
vivo
Target Audience:
3GPP Working Groups, SA2
Period of Validity:
N/A
Approval Date:
2026-01-30
Amendment Date:
N/A
Proposed change:
Documentation of required normative work for GEO voice data transport over UP IP.
Consequences if not approved:
GEO voice data transport over UP IP will not be supported.
Year:
2026
Region / City:
India
Document Type:
Change Request
Organization / Committee:
3GPP TSG-SA5
Author:
Huawei
Work Item Code:
TEI19
Release:
Rel-19
Category:
C
Date Submitted:
2026-01-10
Meeting Number:
165
Clauses Affected:
TraceControlNrm.yaml
Related Specifications:
Other core specifications, Test specifications, O&M Specifications
Revision History:
1st Change at commit 09d56814c19dc9ad803b1dd962315a850f929df4
URL:
https://www.3gpp.org/Change-Requests
Year:
2026
Location:
Goa, India
Organization:
3GPP TSG-SA WG2
Document Type:
Meeting Report
Agenda Item:
20.1.1
Work Item / Release:
FS_5GSAT_Ph4_ARC / Rel-20
Author / Contributor:
MediaTek Inc.
Target Audience:
3GPP members and IMS implementers
Subject:
IMS enhancement, GEO NB-IoT NTN, static SDP pre-definition
Date of Meeting:
February 09–13, 2026
Proposal Status:
Interim conclusion
References:
RFC 4566
Year:
2026
Institution:
University of Florida
Department:
Geography
Course Code:
GEO 2410
Course Type:
Asynchronous Online Class
Instructor:
Zeyu He
Syllabus Contributors:
Neha Kohli, Dr. Michael Waylen, Dr. Heidi Lannon
Email:
[email protected]
Office Hours:
Jan. 19 – Apr. 17, Friday 10:30 AM - 12:30 AM EST, Turlington Hall 1215 or Zoom
Target Audience:
University Students
Required Text:
The Newcastle Social Geographies Collective. 2021 Social Geographies: An Introduction, Rowman & Littlefield Publishers, ISBN 9781786612304
Topics Covered:
Social geography, human-environment interactions, migration, environmental justice, spatial social systems
Assessment:
Weekly deliverables (discussion posts, labs, quizzes), final project proposal outline
Policies:
Student accommodations through Disability Resource Center, online participation, class attendance, professional communication
Resources:
Counseling and Wellness Center, University Police, Canvas platform