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TECHNICAL SPECIFICATION
Digital cellular telecommunications system (Phase 2+) (GSM);
Discontinuous Transmission (DTX) for
Enhanced Full Rate (EFR) speech traffic channels
(3GPP TS 46.081 version 15.0.0 Release 15)
R
GLOBAL SYSTEM FOR
MOBILE COMMUNICATIONS
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3GPP TS 46.081 version 15.0.0 Release 15 1 ETSI TS 146 081 V15.0.0 (2018-07)
Reference
RTS/TSGS-0446081vf00
Keywords
GSM
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3GPP TS 46.081 version 15.0.0 Release 15 2 ETSI TS 146 081 V15.0.0 (2018-07)
Intellectual Property Rights
Essential patents
IPRs essential or potentially essential to normative deliverables may have been declared to ETSI. The information
pertaining to these essential IPRs, if any, is publicly available for ETSI members and non-members, and can be found
in ETSI SR 000 314: "Intellectual Property Rights (IPRs); Essential, or potentially Essential, IPRs notified to ETSI in
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Foreword
This Technical Specification (TS) has been produced by ETSI 3rd Generation Partnership Project (3GPP).
The present document may refer to technical specifications or reports using their 3GPP identities, UMTS identities or
GSM identities. These should be interpreted as being references to the corresponding ETSI deliverables.
The cross reference between GSM, UMTS, 3GPP and ETSI identities can be found under
.
Modal verbs terminology
In the present document "shall", "shall not", "should", "should not", "may", "need not", "will", "will not", "can" and
"cannot" are to be interpreted as described in clause 3.2 of the ETSI Drafting Rules (Verbal forms for the expression of
provisions).
"must" and "must not" are NOT allowed in ETSI deliverables except when used in direct citation.
ETSI
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3GPP TS 46.081 version 15.0.0 Release 15 3 ETSI TS 146 081 V15.0.0 (2018-07)
Contents
Intellectual Property Rights . 2
Foreword . 2
Modal verbs terminology . 2
Foreword . 4
1 Scope . 5
2 References . 5
3 Definitions, symbols and abbreviations . 6
3.1 Definitions . 6
3.2 Symbols . 7
3.3 Abbreviations . 7
4 General . 7
4.1 General organization . 7
5 Transmit (TX) side . 8
5.1 General operation . 8
5.1.1 Functions of the TX DTX handler . 8
5.1.2 Functions of the TX Radio Subsystem . 10
6 Receive (RX) side . 11
6.1 General operation . 11
6.1.1 Functions of the RX radio subsystem . 11
6.1.2 Functions of the RX DTX handler . 11
Annex A (informative): Change history . 13
History . 14
ETSI
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3GPP TS 46.081 version 15.0.0 Release 15 4 ETSI TS 146 081 V15.0.0 (2018-07)
Foreword
rd
This Technical Specification has been produced by the 3 Generation Partnership Project (3GPP).
The present document describes the general baseband operation of Enhanced Full Rate speech traffic channels in the
transmitter and in the receiver of GSM Mobile Stations and Base Station Systems during Discontinuous Transmission
(DTX) within the digital cellular telecommunications system.
The contents of the present document are subject to continuing work within the TSG and may change following formal
TSG approval. Should the TSG modify the contents of the present document, it will be re-released by the TSG with an
identifying change of release date and an increase in version number as follows:
Version x.y.z
where:
x the first digit:
1 presented to TSG for information;
2 presented to TSG for approval;
3 or greater indicates TSG approved document under change control.
y the second digit is incremented for all changes of substance, i.e. technical enhancements, corrections,
updates, etc.
z the third digit is incremented when editorial only changes have been incorporated in the document.
ETSI
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3GPP TS 46.081 version 15.0.0 Release 15 5 ETSI TS 146 081 V15.0.0 (2018-07)
1 Scope
The present document gives a description of the general baseband operation of Enhanced Full Rate speech traffic
channels in the transmitter and in the receiver of GSM Mobile Stations (MS)s and Base Station Systems (BSS)s during
Discontinuous Transmission (DTX).
For clarity, the description is structured according to the block diagrams in figures 1 and 4. Except in the case described
next, this structure of distributing the various functions between system entities is not mandatory for implementation, as
long as the operation on the air interface and on the speech decoder output remains the same.
In the case of BSSs where the speech transcoder is located remotely in the Base Station Controller (BSC), the
implementation of the interfaces between the DTX handlers and the Radio Sub System (RSS) as described in the
present document together with all their flags is mandatory, being part of the A-bis interface as described in GSM 08.60
[13].
The DTX functions described in the present document are mandatory for implementation in the GSM MSs. The
receiver requirements are mandatory for implementation in all GSM BSSs, the transmitter requirements only for those
where downlink DTX will be used.
2 References
The following documents contain provisions which, through reference in this text, constitute provisions of the present
document.
• References are either specific (identified by date of publication, edition number, version number, etc.) or
non-specific.
• For a specific reference, subsequent revisions do not apply.
For a non-specific reference, the latest version applies. In the case of a reference to a 3GPP document (including a
GSM document), a non-specific reference implicitly refers to the latest version of that document in
the same Release as the present document.
[1] GSM 01.04: "Digital cellular telecommunications system (Phase 2+); Abbreviations and
acronyms".
[2] GSM 04.08: "Digital cellular telecommunications system (Phase 2+); Mobile radio interface
layer 3 specification".
[3] GSM 05.03: "Digital cellular telecommunications system (Phase 2+); Channel coding".
[4] GSM 05.05: "Digital cellular telecommunications system (Phase 2+); Radio transmission and
reception".
[5] GSM 05.08: "Digital cellular telecommunications system (Phase 2+); Radio subsystem link
control".
[6] GSM 06.51: "Digital cellular telecommunications system (Phase 2+); Enhanced Full Rate (EFR)
speech processing functions; General description".
[7] GSM 06.53: "Digital cellular telecommunications system (Phase 2+); ANSI-C code for the GSM
Enhanced Full Rate (EFR) speech codec".
[8] GSM 06.54: "Digital cellular telecommunications system (Phase 2+); Test vectors for the GSM
Enhanced Full Rate (EFR) speech codec".
[9] GSM 06.60: "Digital cellular telecommunications system (Phase 2+); Enhanced Full Rate (EFR)
speech transcoding".
[10] GSM 06.61: "Digital cellular telecommunications system (Phase 2+); Substitution and muting of
lost frame for Enhanced Full Rate (EFR) speech traffic channels".
ETSI
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3GPP TS 46.081 version 15.0.0 Release 15 6 ETSI TS 146 081 V15.0.0 (2018-07)
[11] GSM 06.62: "Digital cellular telecommunications system (Phase 2+); Comfort noise aspects for
Enhanced Full Rate (EFR) speech traffic channels".
[12] GSM 06.82: "Digital cellular telecommunications system (Phase 2+); Voice Activity Detector
(VAD) for Enhanced Full Rate (EFR) speech traffic channels".
[13] GSM 08.60: "Digital cellular telecommunications system (Phase 2+); Inband control of remote
transcoders and rate adaptors for Enhanced Full Rate (EFR) and full rate traffic channels".
3 Definitions, symbols and abbreviations
3.1 Definitions
For the purposes of the present document, the following terms and definitions apply:
accepted SID frame: traffic frame which is flagged with SID="1" or SID="2" by the Radio Subsystem.
bad traffic frame: traffic frame flagged BFI flag ="1" (Bad Frame Indication) by the Radio Subsystem.
frame: time interval of 20 msec. corresponding to the time segmentation of the Enhanced Full Rate speech transcoder
(GSM 06.60 [9]), also used as a short term for a traffic frame.
good speech frame: good traffic frame which is not an accepted SID frame.
good traffic frame: traffic frame flagged BFI flag ="0" by the Radio Subsystem.
hangover period: period of 7 frames added at the end of a speech burst in which VAD flag ="0" and SP flag ="1".
invalid SID frame: accepted SID frame which was not classified as va
...