3GPP Atlas

Canonical Atlas record

TR 26.940

Study on Ultra Low Bit rate Speech Codecs

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Responsible WGS4
StatusUnder change control
Initial releaseRel-20
Selected releaseRel-20
Latest indexed version20.1.0
Series26
TypeTR

Release evolution

Compare evidence between releases

Use indexed version, Work Item and Change Request evidence to see what changed around this specification. This is an evidence trail, not a clause-by-clause normative diff.

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Release ledger

Version · WI · CR evidence by release

Rel-2020.1.02 WI5 CRs · 1 approved

Rel-20 snapshot

Work affecting this release

5 indexed Change Requests · 2 connected Work Items.

Showing 5 CR records from the available cross-release sample. Browse release CR records (JSON) →

CR 0002 rev.1 — Correction of simulated TBS values

CR 0003 — update of the system architecture for non-IP delivery for IMS voice packets over NB-IoT NTN

CR 0001 — Addition of the RAN simulation error traces as electronic attachments

CR 0001 rev.1 — Addition of the RAN simulation error traces as electronic attachments

CR 0002 — Correction of simulated TBS values

Version history

Indexed versions

Showing 17 of 17 indexed versions.

20.1.0Rel-20SA#1132026-10-04
20.0.0Rel-20SA#1122026-07-10
1.0.0Rel-20 · pre-approvalSA#1122026-06-02
0.9.0Rel-20 · pre-approvalSA4#1362026-05-21
0.8.0Rel-20 · pre-approvalSA4#1362026-05-18
0.7.0Rel-20 · pre-approvalSA4#135-bis-e2026-04-17
0.6.1Rel-20 · pre-approvalSA4#1352026-03-26
0.6.0Rel-20 · pre-approvalSA4#1352026-03-26
0.5.1Rel-20 · pre-approvalSA4#1352026-02-03
0.4.0Rel-20 · pre-approvalSA4#1342025-11-11
0.2.0Rel-20 · pre-approvalSA4#1322025-07-04
0.1.0Rel-20 · pre-approvalSA4#131-bis-e2025-04-17
0.0.2Rel-20 · pre-approvalSA4#131-bis-e2025-04-17
0.0.1Rel-20 · pre-approvalSA4#131-bis-e2025-04-07
0.5.0Rel-20 · pre-approvalSA4#134—
0.4.1Rel-20 · pre-approvalSA4#134—
0.3.0Rel-20 · pre-approvalSA4#133-e—

Atlas classifications

Meaning and provenance

No Atlas classifications have been attached yet.

Work Items

Standards work connected to TR 26.940

FS_ULBC

Study on Ultra Low Bitrate Speech Codec

Rel-20official
ULBC-MED

Ultra Low Bitrate Speech Codec for IMS Voice Call over NB-IoT NTN via GEO Satellite

Rel-20parsed

Knowledge graph

Related standards

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