SIST ETS 300 581-5 E1:2003

European digital cellular telecommunications system; Half rate speech; Part 5: Discontinuous Transmission (DTX) for half rate speech traffic channels (GSM 06.41)

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Evropski digitalni celični telekomunikacijski sistem – Govor s polovično hitrostjo – 5. del: Nezvezno oddajanje (DTX) po prometnih kanalih z govorom s polovično hitrostjo (GSM 06.41)

General Information

• Status: Published
• Publication Date: 30-Nov-2003
• ICS: 33.070.50 - Global System for Mobile Communication (GSM)
• Technical Committee: SS EIT - Technical Board for the electrotechnical, information technology and telecommunications fields
• Current Stage: 6060 - National Implementation/Publication (Adopted Project)
• Start Date: 01-Dec-2003
• Due Date: 01-Dec-2003
• Completion Date: 01-Dec-2003
• Mandate: T-172
• Ref Project: ETSI ETS 300 581-5 ed.1 (1995-12) - European digital cellular telecommunications system; Half rate speech; Part 5: Discontinuous Transmission (DTX) for half rate speech traffic channels (GSM 06.41)

Standards Content (Sample)

SLOVENSKI STANDARD
SIST ETS 300 581-5 E1:2003
01-december-2003
(YURSVNLGLJLWDOQLFHOLþQLWHOHNRPXQLNDFLMVNLVLVWHP±*RYRUVSRORYLþQRKLWURVWMR±
GHO1H]YH]QRRGGDMDQMH'7;SRSURPHWQLKNDQDOLK]JRYRURPVSRORYLþQR
KLWURVWMR*60
European digital cellular telecommunications system; Half rate speech; Part 5:
Discontinuous Transmission (DTX) for half rate speech traffic channels (GSM 06.41)
Ta slovenski standard je istoveten z: ETS 300 581-5 Edition 1
ICS:
33.070.50 Globalni sistem za mobilno Global System for Mobile
telekomunikacijo (GSM) Communication (GSM)
SIST ETS 300 581-5 E1:2003 en
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

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SIST ETS 300 581-5 E1:2003

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SIST ETS 300 581-5 E1:2003
EUROPEAN ETS 300 581-5
TELECOMMUNICATION November 1995
STANDARD
Source: ETSI TC-SMG Reference: DE/SMG-020641
ICS: 33.060.50
European digital cellular telecommunications system, Global System for Mobile communications
Key words:
(GSM)
European digital cellular telecommunications system;
Half rate speech
Part 5: Discontinuous transmission (DTX) for half rate
speech traffic channels
(GSM 06.41)
ETSI
European Telecommunications Standards Institute
ETSI Secretariat
F-06921 Sophia Antipolis CEDEX - FRANCE
Postal address:
650 Route des Lucioles - Sophia Antipolis - Valbonne - FRANCE
Office address:
c=fr, a=atlas, p=etsi, s=secretariat - [e-mail]
X.400: Internet:
Tel.: [phone] - Fax: [phone]
*
Copyright Notification: No part may be reproduced except as authorized by written permission. The copyright and the
foregoing restriction extend to reproduction in all media.
© European Telecommunications Standards Institute 1995. All rights reserved.

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SIST ETS 300 581-5 E1:2003
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ETS 300 581-5: November 1995 (GSM 06.41 version 4.0.2)
Whilst every care has been taken in the preparation and publication of this document, errors in content,
typographical or otherwise, may occur. If you have comments concerning its accuracy, please write to
"ETSI Editing and Committee Support Dept." at the address shown on the title page.

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ETS 300 581-5: November 1995 (GSM 06.41 version 4.0.2)
Contents
Foreword .5
1 Scope .7
2 Normative references.7
3 Definitions, symbols and abbreviations.8
3.1 Definitions .8
3.2 Symbols .9
3.3 Abbreviations .9
4 General.10
4.1 General Organisation.10
5 Transmit (TX) side.10
5.1 General Operation .10
5.1.1 Functions of the TX DTX handler.11
5.1.2 Functions of the TX radio subsystem.12
6 Receive (RX) side .14
6.1 General operation .14
6.1.1 Functions of the RX radio subsystem .14
6.1.2 Functions of the RX DTX handler .15
History.16

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ETS 300 581-5: November 1995 (GSM 06.41 version 4.0.2)
Foreword
This European Telecommunication Standard (ETS) has been produced by the Special Mobile Group
(SMG) Technical Committee of the European Telecommunications Standards Institute (ETSI).
This ETS specifies the half rate speech traffic channels for the European digital cellular
telecommunications system. This ETS corresponds to GSM technical specification, GSM 06.41, version
4.0.2 and is part 5 of a multi-part ETS covering the half rate speech traffic channels as described below:
GSM 06.02 ETS 300 581-1: "European digital cellular telecommunications system; Half rate
speech Part 1: Half rate speech processing functions".
GSM 06.20 ETS 300 581-2: "European digital cellular telecommunications system; Half rate
speech Part 2: Half rate speech transcoding".
GSM 06.21 ETS 300 581-3: "European digital cellular telecommunications system; Half rate
speech Part 3: Substitution and muting of lost frames for half rate speech traffic
channels".
GSM 06.22 ETS 300 581-4: "European digital cellular telecommunications system; Half rate
speech Part 4: Comfort noise aspects for half rate speech traffic channels".
GSM 06.41 ETS 300 581-5: "European digital cellular telecommunications system;
Half rate speech Part 5: Discontinuous Transmission (DTX) for half rate
speech traffic channels".
GSM 06.42 ETS 300 581-6: "European digital cellular telecommunications system; Half rate
speech Part 6: Voice Activity Detection (VAD) for half rate speech traffic
channels".
GSM 06.06 ETS 300 581-7: "European digital cellular telecommunications system; Half rate
speech Part 7: ANSI-C code for the GSM half rate speech codec".
GSM 06.07 ETS 300 581-8: "European digital cellular telecommunications system; Half rate
speech Part 8: Test vectors for the GSM half rate speech codec".
NOTE: TC-SMG has produced documents which give the technical specifications for the
implementation of the European digital cellular telecommunications system.
Historically, these documents have been identified as GSM Technical Specifications
(GSM-TS). These TSs may have subsequently become Interim European
Telecommunication Standards (I-ETSs), (Phase 1), or European Telecommunication
Standards (ETSs), (Phase 2), whilst others may become ETSI Technical Reports
(ETRs).
Transposition dates
Date of adoption of this ETS: 27 October 1995
Date of latest announcement of this ETS (doa): 28 February 1996
Date of latest publication of new National Standard
or endorsement of this ETS (dop/e): 31 August 1996
Date of withdrawal of any conflicting National Standard (dow): 31 August 1996

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ETS 300 581-5: November 1995 (GSM 06.41 version 4.0.2)
1 Scope
This European Telecommunication Standard (ETS) gives a description of the general baseband operation
of half 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 figure 1 and 4. Except in the
case described below, 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 this ETS together with all their flags is mandatory, being a part of the A-bis interface as
described in GSM 08.61 (ETS 300 598) [11].
The DTX functions described in this ETS are mandatory for implementation in all 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 Normative references
This ETS incorporates by dated and undated reference, provisions from other publications. These
normative references are cited at the appropriate places in the text and the publications are listed
hereafter. For dated references, subsequent amendments to or revisions of any of these publications
apply to this ETS only when incorporated in it by amendment or revision. For undated references, the
latest edition of the publication referred to applies.
[1] GSM 01.04 (ETR 100): "European digital cellular telecommunication system
(Phase 2); Abbreviations and acronyms".
[2] GSM 04.08 (ETS 300 557): "European digital cellular telecommunications
system (phase 2); Mobile radio interface layer 3 specification".
[3] GSM 05.05 (ETS 300 577): "European digital cellular telecommunications
system (phase 2); Radio transmission and reception".
[4] GSM 05.08 (ETS 300 578): "European digital cellular telecommunications
system (phase 2); Radio subsystem link control".
[5] GSM 06.02 (ETS 300 581-1): "European digital cellular telecommunications
system; Half rate speech Part 1: Half rate speech processing functions".
[6] GSM 06.12 (ETS 300 580-4): "European digital cellular telecommunications
system; Comfort noise aspects for full rate speech traffic channels".
[7] GSM 06.20 (ETS 300 581-2): "European digital cellular telecommunications
system; Half rate speech Part 2: Half rate speech transcoding".
[8] GSM 06.21 (ETS 300 581-3): "European digital cellular telecommunications
system; Half rate speech Part 3: Substitution and muting of lost frame for half
rate speech traffic channels".
[9] GSM 06.22 (ETS 300 581-4): "European digital cellular telecommunications
system; Half rate speech Part 4: Comfort noise aspects for half rate speech
traffic channels ".
[10] GSM 06.42 (ETS 300 581-6): "European digital cellular telecommunications
system; Half rate speech Part 6: Voice Activity Detection (VAD) for half rate
speech frame traffic channels".

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ETS 300 581-5: November 1995 (GSM 06.41 version 4.0.2)
[11] GSM 08.61 (ETS 300 598): " European digital cellular telecommunications
system (phase 2); Inband control of remote transcoder and rate adaptors".
3 Definitions, symbols and abbreviations
3.1 Definitions
For the purpose of this ETS, the following definitions apply.
frame: Time interval of 20 ms corresponding to the time segmentation of the half rate speech transcoder
defined in GSM 06.20 (ETS 300 581-2) [7]), also used as a short term for a traffic frame.
traffic frame: Block of 112 information bits transmitted on the half rate speech traffic channel.
SID frame: Frame characterised by the SID (Silence Descriptor) code word. It conveys information on the
acoustic background noise.
SID code word: Fixed bit pattern defined in GSM 06.22 (ETS 300 581-4) [9], for labelling a traffic frame
as a SID frame.
SID field: The bit positions defined in GSM 06.22 (ETS 300 581-4) [9], of the SID codeword within a SID
frame.
speech frame: Traffic frame that cannot be classified as a SID frame.
bad traffic frame: A traffic frame flagged BFI="1" (Bad Frame Indication) or with UFI="1" (Unreliable
Frame Indication) by the Radio Subsystem.
good traffic frame: A traffic frame flagged BFI="0" and UFI="0" by the Radio Subsystem.
good speech f
...