S4-260157 - AI Proposals

[FS_ULBC] Discussion on Audio Bandwidth for ULBC

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Extracted Proposals

Based on my analysis of the document, here are the proposals found in the "Proposal" section (Section 5):

Proposal 1: The codec shall be able to operate with an 8 kHz sampling rate, supporting an audio bandwidth of 50 – 4000 Hz.

Proposal 2: The codec shall be able to operate with a 16 kHz sampling rate (50 – 8000 Hz audio bandwidth) to offer enhanced quality where channel conditions and device capabilities permit. For example, WB support can be limited to higher bitrates than NB operation.

Proposal 3: The necessity and feasibility of including Super-Wideband (SWB) and Full-band (FB) support remains for further study.

Document Information
TDoc:
S4-260157
Source:
vivo, Samsung, MediaTek Inc., Bytedance, Nokia, Xiaomi, Spreadtrum
Type:
pCR
For:
Agreement
Original Document:
View on 3GPP
Title: [FS_ULBC] Discussion on Audio Bandwidth for ULBC
Agenda item: 7.8
Agenda item description: FS_ULBC (Study on Ultra Low Bitrate Speech Codec)
Doc type: pCR
For action: Agreement
Abstract: This document provides a technical discussion on the audio bandwidth design constraints for the Ultra-Low Bitrate Codec (ULBC) [1]. As 3GPP is to define in this work the requirements for a codec intended for extremely constrained environments, mainly on satellite (GEO) communications, it is crucial to prioritize design choices that maximize robustness and efficiency. Recent discussions have considered possible mandating Wideband (WB) and Super-Wideband (SWB) support for ULBC [2]. However, we argue that for the target use cases, mandatory support for Narrowband (NB) is essential, while whether wider bandwidths should be considered further enhancements of this baseline. This paper synthesizes key technical arguments and presents new experimental data to support a design philosophy focusing on performance in the most challenging conditions.
Release: Rel-20
Specification: 26.94
Version: 0.4.0
Related WIs: FS_ULBC
Spec: 26.94
Contact: Wang Dong
Uploaded: 2026-02-03T13:43:09.967000
Contact ID: 107237
TDoc Status: noted
Is revision of: S4-251794
Reservation date: 03/02/2026 12:37:15
Agenda item sort order: 20