ETSI ETS 300 970 ed.1 (1997-05)

Digital cellular telecommunications system; Half rate speech; Substitution and muting of lost frames for half rate speech traffic channels (GSM 06.21 version 5.0.1)

DE/SMG-110621Q

Digitalni celični telekomunikacijski sistem – Govor s pol hitrosti – Nadomeščanje in zapiranje izgubljenih okvirov pri kanalih za prenos govora s pol hitrosti (GSM 06.21, različica 5.0.1)

General Information

• Status: Published
• Publication Date: 12-May-1997
• Technical Committee: SMG 11 - Speech Aspects
• Current Stage: 12 - Completion
• Due Date: 25-Apr-1997
• Completion Date: 13-May-1997
• Mandate: T-172
• Ref Project: SIST ETS 300 970 E1:2003 - Digital cellular telecommunications system; Half rate speech; Substitution and muting of lost frames for half rate speech traffic channels (GSM 06.21 version 5.0.1)

Standards Content (Sample)

SLOVENSKI STANDARD
01-december-2003
'LJLWDOQLFHOLþQLWHOHNRPXQLNDFLMVNLVLVWHP±*RYRUVSROKLWURVWL±1DGRPHãþDQMH
LQ]DSLUDQMHL]JXEOMHQLKRNYLURYSULNDQDOLK]DSUHQRVJRYRUDVSROKLWURVWL*60
UD]OLþLFD
Digital cellular telecommunications system; Half rate speech; Substitution and muting of
lost frames for half rate speech traffic channels (GSM 06.21 version 5.0.1)
Ta slovenski standard je istoveten z: ETS 300 970 Edition 1
ICS:
33.070.50 Globalni sistem za mobilno Global System for Mobile
telekomunikacijo (GSM) Communication (GSM)
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

EUROPEAN ETS 300 970
TELECOMMUNICATION May 1997
STANDARD
Source: ETSI TC-SMG Reference: DE/SMG-110621Q
ICS: 33.020
Key words: Digital cellular telecommunications system, Global System for Mobile communications (GSM)
R
GLOBAL SYSTEM FOR
MOBILE COMMUNICATIONS
Digital cellular telecommunications system;
Half rate speech;
Substitution and muting of lost frames for half rate
speech traffic channels
(GSM 06.21 version 5.0.1)
ETSI
European Telecommunications Standards Institute
ETSI Secretariat
Postal address: F-06921 Sophia Antipolis CEDEX - FRANCE
Office address: 650 Route des Lucioles - Sophia Antipolis - Valbonne - FRANCE
X.400: c=fr, a=atlas, p=etsi, s=secretariat - Internet: [e-mail]
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 1997. All rights reserved.

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ETS 300 970 (GSM 06.21 version 5.0.1): May 1997
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 300 970 (GSM 06.21 version 5.0.1): May 1997
Contents
Foreword .5
1 Scope .7
2 Normative references.7
3 Definitions and abbreviations .7
3.1 Definitions .7
3.2 Abbreviations .7
4 General.8
5 Requirements.8
5.1 Error detection and concealment in case of unreliable speech or SID frames.8
5.1.1 Error detection.8
5.1.2 Output signal concealment.8
5.2 Frame substitution and muting in case of lost speech or SID frames .8
5.2.1 First and second lost speech frame .8
5.2.2 Subsequent lost speech frames.8
5.2.3 First and second lost SID frame.8
5.2.4 Subsequent lost SID frames .9
6 Example solutions .9
6.1 Example solution for error detection in case of unreliable frames.9
6.2 Example solution for output signal concealment in case of unreliable frames .9
6.3 Example solution for substitution and muting of lost speech frames.9
6.4 Example solution for substitution and muting of lost SID frames .10
History.11

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ETS 300 970 (GSM 06.21 version 5.0.1): May 1997
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ETS 300 970 (GSM 06.21 version 5.0.1): May 1997
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 defines a frame substitution and muting procedure which shall be used by the Receive (RX)
Discontinuous Transmission (DTX) handler for the half rate speech traffic channels within the digital
cellular telecommunications system. This ETS is part of ETSs' series covering the half rate speech traffic
channels as described below:
GSM 06.02 ETS 300 966: "Digital cellular telecommunications system; Half rate speech;
Half rate speech processing functions".
GSM 06.20 ETS 300 969: "Digital cellular telecommunications system; Half rate speech;
Half rate speech transcoding".
GSM 06.21 ETS 300 970: "Digital cellular telecommunications system; Half rate
speech; Substitution and muting of lost frames for half rate speech traffic
channels".
GSM 06.22 ETS 300 971: "Digital cellular telecommunications system; Half rate speech;
Comfort noise aspects for half rate speech traffic channels".
GSM 06.41 ETS 300 972: "Digital cellular telecommunications system; Half rate speech;
Discontinuous Transmission (DTX) for half rate speech traffic channels".
GSM 06.42 ETS 300 973: "Digital cellular telecommunications system; Half rate speech;
Voice Activity Detector (VAD) for half rate speech traffic channels".
GSM 06.06 ETS 300 967: "Digital cellular telecommunications system; Half rate speech;
ANSI-C code for the GSM half rate speech codec".
GSM 06.07 ETS 300 968: "Digital cellular telecommunications system; Half rate speech;
Test sequences for the GSM half rate speech codec".
Transposition dates
Date of adoption: 4 April 1997
Date of latest announcement of this ETS (doa): 31 August 1997
Date of latest publication of new National Standard
or endorsement of this ETS (dop/e): 28 February 1998
Date of withdrawal of any conflicting National Standard (dow): 28 February 1998

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ETS 300 970 (GSM 06.21 version 5.0.1): May 1997
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ETS 300 970 (GSM 06.21 version 5.0.1): May 1997
1 Scope
This European Telecommunication Standard (ETS) defines a frame substitution and muting procedure
which shall be used by the Receive (RX) Discontinuous Transmission (DTX) handler when one or more
lost or unreliable speech or SIlence Descriptor (SID) frames are received from the Radio Sub System
(RSS).
The requirements of this ETS are mandatory for implementation in all GSM Base Station Systems (BSS)s
and Mobile Stations (MS)s capable of supporting the half rate speech traffic channel.
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 350): "Digital cellular telecommunications system (Phase 2+);
Abbreviations and acronyms".
[2] GSM 05.03 (ETS 300 909): "Digital cellular telecommunications system
(Phase 2+); Channel coding".
[3] GSM 06.20 (ETS 300 969): "Digital cellular telecommunications system; Half
rate speech; Half rate speech transcoding".
[4] GSM 06.41 (ETS 300 972): "Digital cellular telecommunications system; Half
rate speech; Discontinuous Transmission (DTX) for half rate speech traffic
channels".
[5] GSM 06.06 (ETS 300 967): "Digital cellular telecommunications system; Half
rate speech; ANSI-C code for the GSM half rate speech codec".
3 Definitions and abbreviations
3.1 Definitions
The definitions of terms used i
...