TS 06.21 – Frame Substitution and Muting for Half Rate Speech
3GPP TS 06.21 is the 3GPP Technical Specification for Frame Substitution and Muting for Half Rate Speech. It is published in 4 releases (Ph2 to R98); the latest version is 7.0.1 in R98.
Defines frame substitution and muting procedures for half rate speech channels when lost or unreliable frames are received from the radio subsystem.
Releases and versions of TS 06.21
| Release | Latest version | Links |
|---|---|---|
| R98 | 7.0.1 | Read · Download (3GPP) |
| R97 | 6.0.1 | Read · Download (3GPP) |
| R96 | 5.0.1 | Read · Download (3GPP) |
| Ph2 | 4.0.2 | Read · Download (3GPP) |
Scope of TS 06.21
Category: Services (Speech and Audio). Technology generation: 2G. Network layer: RAN.
Who should read this specification?
- Network operators
- Device manufacturers
Implementation notes
Complexity level: Intermediate. Implementation difficulty: Medium.
Key technologies
Other specifications in the 06 series
- TS 06.10 GSM Full Rate Speech Transcoding
- TS 06.11 DTX Frame Substitution and Muting Procedure
- TS 06.12 GSM Comfort Noise for DTX
- TS 06.20 GSM Half Rate Speech Codec Specification
- TS 06.22 Half Rate Speech DTX Comfort Noise
- TS 06.31 DTX operation for GSM speech channels
- TS 06.32 Voice Activity Detector for DTX
- TS 06.41 Half Rate Speech DTX Operation Specification
Related glossary terms
Related topics
Frequently asked questions
What is 3GPP TS 06.21?
3GPP TS 06.21 is the 3GPP Technical Specification for Frame Substitution and Muting for Half Rate Speech. Defines frame substitution and muting procedures for half rate speech channels when lost or unreliable frames are received from the radio subsystem.
Which 3GPP releases include TS 06.21?
TS 06.21 is published in 4 releases, from Ph2 to R98. The latest version on 3GPP Explorer is 7.0.1 (R98).
What category does TS 06.21 belong to?
TS 06.21 belongs to the Services (Speech and Audio) category of 3GPP specifications. It applies to 2G networks.
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