SIST ETS 300 729 E2:2003

Digital cellular telecommunications system; Discontinuous Transmission (DTX) for Enhanced Full Rate (EFR) speech traffic channels (GSM 06.81 version 5.2.1 Release 1996)

This draft European Telecommunication Standard (ETS)  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 and Base Station Systems 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 this draft ETS together with all their flags is mandatory, being part of the A-bis interface as described in GSM 08.61.  The DTX functions described in this technical specification 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.

Digitalni celični telekomunikacijski sistem – Nezvezno oddajanje (DTX) v prometnih kanalih izboljšanega govora s polno hitrostjo (EFR) (GSM 06.81, različica 5.2.1, izdaja 1996 )

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 300 729 ed.2 (2000-05) - Digital cellular telecommunications system; Discontinuous Transmission (DTX) for Enhanced Full Rate (EFR) speech traffic channels (GSM 06.81 version 5.2.1 Release 1996)

Standards Content (Sample)

SLOVENSKI STANDARD
SIST ETS 300 729 E2:2003
01-december-2003
'LJLWDOQLFHOLþQLWHOHNRPXQLNDFLMVNLVLVWHP±1H]YH]QRRGGDMDQMH'7;Y
SURPHWQLKNDQDOLKL]EROMãDQHJDJRYRUDVSROQRKLWURVWMR()5*60
UD]OLþLFDL]GDMD
Digital cellular telecommunications system; Discontinuous Transmission (DTX) for
Enhanced Full Rate (EFR) speech traffic channels (GSM 06.81 version 5.2.1 Release
1996)
Ta slovenski standard je istoveten z: ETS 300 729 Edition 2
ICS:
33.070.50 Globalni sistem za mobilno Global System for Mobile
telekomunikacijo (GSM) Communication (GSM)
SIST ETS 300 729 E2:2003 en
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

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SIST ETS 300 729 E2:2003

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SIST ETS 300 729 E2:2003
EUROPEAN ETS 300 729
TELECOMMUNICATION April 2000
STANDARD Second Edition
Source: SMG Reference: RE/SMG-020681R1
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;
Discontinuous Transmission (DTX) for Enhanced
Full Rate (EFR) speech traffic channels
(GSM 06.81 version 5.2.1 Release 1996)
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
Internet: [e-mail] - http://www.etsi.org
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 2000. All rights reserved.

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ETS 300 729 (GSM 06.81 version 5.2.1): April 2000
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 Standards Making Support Dept." at the address shown on the title page.

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Contents
Intellectual Property Rights.5
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.9
4.1 General organization.9
5 Transmit (TX) side.10
5.1 General operation .10
5.1.1 Functions of the TX DTX handler.10
5.1.2 Functions of the TX Radio Subsystem .12
6 Receive (RX) side .13
6.1 General operation .13
6.1.1 Functions of the RX radio subsystem.13
6.1.2 Functions of the RX DTX handler.14
Annex A (informative): Change Request History.15
History.16

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Intellectual Property Rights
IPRs essential or potentially essential to the present document 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 SR 000 314: "Intellectual Property Rights (IPRs); Essential, or potentially
Essential, IPRs notified to ETSI in respect of ETSI standards", which is available from the ETSI
Secretariat. Latest updates are available on the ETSI Web server (http://www.etsi.org/ipr).
Pursuant to the ETSI IPR Policy, no investigation, including IPR searches, has been carried out by ETSI.
No guarantee can be given as to the existence of other IPRs not referenced in SR 000 314 (or the
updates on the ETSI Web server) which are, or may be, or may become, essential to the present
document.
Foreword
This European Telecommunication Standard (ETS) has been produced by the Special Mobile Group
(SMG).
This ETS 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 is subject to continuing work within SMG and may change following
formal SMG approval. Should SMG modify the contents of the present document it will be re-released with
an identifying change of release date and an increase in version number as follows:
Version 5.x.y
where:
5 GSM Phase 2+ Release 1996
x the second digit is incremented for changes of substance, i.e. technical enhancements,
corrections, updates, etc.;
y the third digit is incremented when editorial only changes have been incorporated in the
specification.
Proposed transposition dates
Date of adoption of this EN: 31 March 2000
Date of latest announcement of this ETS (doa): 30 June 2000
Date of latest publication of new National Standard
or endorsement of this ETS (dop/e): 31 December 2000
Date of withdrawal of any conflicting National Standard (dow): 31 December 2000

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1 Scope
This European Telecommunication Standard (ETS) 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 this ETS together with all their flags is mandatory, being part of the A-bis interface as
described in GSM 08.60 (ETS 300 737) [13].
The DTX functions described in this technical specification 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 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): "Digital cellular telecommunications system (Phase 2);
Abbreviations and acronyms".
[2] GSM 04.08 (ETS 300 557): "Digital cellular telecommunications system
(Phase 2); Mobile radio interface layer 3 specification".
[3] GSM 05.03 (ETS 300 575): "Digital cellular telecommunications system
(Phase 2); Channel coding".
[4] GSM 05.05 (ETS 300 577): "Digital cellular telecommunications system
(Phase 2); Radio transmission and reception".
[5] GSM 05.08 (ETS 300 578): "Digital cellular telecommunications system
(Phase 2); Radio subsystem link control".
[6] GSM 06.51 (ETS 300 723): "Digital cellular telecommunications system;
Enhanced Full Rate (EFR) speech processing functions; General description".
[7] GSM 06.53 (ETS 300 724): "Digital cellular telecommunications system; ANSI-C
code for the GSM Enhanced Full Rate (EFR) speech codec".
[8] GSM 06.54 (ETS 300 725): "Digital cellular telecommunications system
(Phase 2); Test vectors for the GSM Enhanced Full Rate (EFR) speech codec".
[9] GSM 06.60 (ETS 300 726): "Digital cellular telecommunications system;
Enhanced Full Rate (EFR) speech transcoding".
[10] GSM 06.61 (ETS 300 727): "Digital cellular telecommunications system;
Substitution and muting of lost frame for Enhanced Full Rate (EFR) speech
traffic channels".
[11] GSM 06.62 (ETS 300 728): "Digital cellular telecommunications system;
Comfort noise aspects for Enhanced Full Rate (EFR) speech traffic channels".

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[12] GSM 06.82 (ETS 300 730): "Digital cellular telecommunications system; Voice
Activity Detector (VAD) for Enhanced Full Rate (EFR) speech traffic channels".
[13] GSM 08.60 (ETS 300 737): "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 this ETS, the following terms and definitions apply:
accepted SID frame: A traffic frame which is flagged with SID="1" or SID="2" by the Radio Subsystem.
bad traffic frame: A 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 (ETS 300 726) [9]), also used as a short term for a traffic frame.
good speech frame: A good traffic frame which is not an accepted SID frame.
good traffic frame: A traffic frame flagged BFI flag ="0" by the Radio Subsystem.
hangover period: A period of 7 frames added at the end of a speech burst in which VAD flag ="0" and SP
flag ="1".
invalid SID frame: An accepted SID frame which was not classified as valid SID frame. This frame is not
valid for updating comfort noise parameters, but the frame conveys information that comfort noise
generations should be started or continued.
lost SID frame: An unusable frame received when the RX DTX handler is generating comfort noise and a
SID frame is expected (Time Alignment Flag, TAF="1").
lost speech frame: An unusable frame received when the RX DTX handler is passing on traffic frames
directly to the speech decoder.
SID code word: Fixed bit pattern defined in GSM 06.62 (ETS 300 728) [11], for labelling a traffic frame as
a SID frame.
SID field: The bit positions defined in GSM 06.62 (ETS 300 728) [11], of the SID codeword within a SID
frame.
SID frame: Frame ch
...