SIST EN 300 972 V6.0.1:2003

Digital cellular telecommunications system (Phase 2+) (GSM); Half rate speech; Discontinuous Transmission (DTX) for half rate speech traffic channels (GSM 06.41 version 6.0.1 Release 1997)

Upgrade from Phase 2+ to Release 1997

Digitalni celični telekomunikacijski sistem (faza 2+) – Govor s polovično hitrostjo – Nezvezno oddajanje (DTX) pri prometnih kanalih s polovično hitrostjo govora (GSM 06.41, različica 6.0.1, izdaja 1997)

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 EN 300 972 V6.0.1 (1999-06) - Digital cellular telecommunications system (Phase 2+) (GSM); Half rate speech; Discontinuous Transmission (DTX) for half rate speech traffic channels (GSM 06.41 version 6.0.1 Release 1997)

Standards Content (Sample)

2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.Digital cellular telecommunications system (Phase 2+) (GSM); Half rate speech; Discontinuous Transmission (DTX) for half rate speech traffic channels (GSM 06.41 version 6.0.1 Release 1997)33.070.50Globalni sistem za mobilno telekomunikacijo (GSM)Global System for Mobile Communication (GSM)ICS:Ta slovenski standard je istoveten z:EN 300 972 Version 6.0.1SIST EN 300 972 V6.0.1:2003en01-december-2003SIST EN 300 972 V6.0.1:2003SLOVENSKI
STANDARD
EN 300 972 V6.0.1 (1999-06)European Standard (Telecommunications series)Digital cellular telecommunications system (Phase 2+);Half rate speech;Discontinuous Transmission (DTX)for half rate speech traffic channels(GSM 06.41 version 6.0.1 Release 1997)GLOBAL SYSTEM
FOR MOBILE COMMUNICATIONSRSIST EN 300 972 V6.0.1:2003

ETSIEN 300 972 V6.0.1 (1999-06)2GSM 06.41 version 6.0.1 Release 1997ReferenceDEN/SMG-110641Q6 (9000300o.PDF)KeywordsDigital cellular telecommunications system,Global System for Mobile communications (GSM)ETSIPostal addressF-06921 Sophia Antipolis Cedex - FRANCEOffice address650 Route des Lucioles - Sophia AntipolisValbonne - FRANCETel.: [phone]
Fax: [phone]Siret N° 348 623 562 00017 - NAF 742 CAssociation à but non lucratif enregistrée à laSous-Préfecture de Grasse (06) N° 7803/[e-mail] copies of this ETSI deliverablecan be downloaded fromhttp://www.etsi.orgCopyright NotificationNo 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 1999.All rights reserved.SIST EN 300 972 V6.0.1:2003

ETSIEN 300 972 V6.0.1 (1999-06)3GSM 06.41 version 6.0.1 Release 1997ContentsIntellectual Property Rights.4Foreword.41Scope.62References.63Definitions, symbols and abbreviations.73.1Definitions.73.2Symbols.83.3Abbreviations.84General.84.1General Organisation.85Transmit (TX) side.95.1General Operation.95.1.1Functions of the TX DTX handler.95.1.2Functions of the TX radio subsystem.106Receive (RX) side.126.1General operation.126.1.1Functions of the RX radio subsystem.126.1.2Functions of the RX DTX handler.13Annex A (informative):Change Request History.14History.15SIST EN 300 972 V6.0.1:2003

ETSIEN 300 972 V6.0.1 (1999-06)4GSM 06.41 version 6.0.1 Release 1997Intellectual Property RightsIPRs essential or potentially essential to the present document may have been declared to ETSI. The informationpertaining to these essential IPRs, if any, is publicly available for ETSI members and non-members, and can be foundin SR 000 314: "Intellectual Property Rights (IPRs); Essential, or potentially Essential, IPRs notified to ETSI in respectof ETSI standards", which is available free of charge from the ETSI Secretariat. Latest updates are available on theETSI 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 guaranteecan 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.ForewordThis European Standard (Telecommunications series) has been produced by ETSI Technical Committee Special MobileGroup (SMG).The present document is a GSM technical specification version 6 and is part of the 1997 release of the GSM TechnicalSpecifications. The present document is part of a series covering the half rate speech traffic channels as describedbelow:GSM 06.02"Digital cellular telecommunications system (Phase 2+); Half rate speech; Half rate speechprocessing functions".GSM 06.06"Digital cellular telecommunications system (Phase 2+); Half rate speech; ANSI-C code for theGSM half rate speech codec".GSM 06.07"Digital cellular telecommunications system (Phase 2+); Half rate speech; Test sequences for theGSM half rate speech codec".GSM 06.20"Digital cellular telecommunications system (Phase 2+); Half rate speech; Half rate speechtranscoding".GSM 06.21"Digital cellular telecommunications system (Phase 2+); Half rate speech; Substitution and mutingof lost frames for half rate speech traffic channels".GSM 06.22"Digital cellular telecommunications system (Phase 2+); Half rate speech; Comfort noise aspectsfor half rate speech traffic channels".GSM 06.41"Digital cellular telecommunications system (Phase 2+); Half rate speech; DiscontinuousTransmission (DTX) for half rate speech traffic channels".GSM 06.42"Digital cellular telecommunications system (Phase 2+); Half rate speech; Voice Activity Detector(VAD) for half rate speech traffic channels".The contents of the present document is subject to continuing work within SMG and may change following formal SMGapproval. Should SMG modify the contents of the present document it will be re-released with an identifying change ofrelease date and an increase in version number as follows:Version 6.x.ywhere:6indicates Release 1997 of GSM Phase 2+xthe second digit is incremented for all changes of substance, i.e. technical enhancements, corrections, updates,etc.ythe third digit is incremented when editorial only changes have been incorporated in the specification.SIST EN 300 972 V6.0.1:2003

ETSIEN 300 972 V6.0.1 (1999-06)5GSM 06.41 version 6.0.1 Release 1997Proposed national transposition datesDate of adoption of this EN:05 June 1999Date of latest announcement of this EN (doa):30 September 1999Date of latest publication of new National Standardor endorsement of this EN (dop/e):31 March 2000Date of withdrawal of any conflicting National Standard (dow):31 March 2000SIST EN 300 972 V6.0.1:2003

ETSIEN 300 972 V6.0.1 (1999-06)6GSM 06.41 version 6.0.1 Release 19971ScopeThe present document gives a description of the general baseband operation of half rate speech traffic channels in thetransmitter and in the receiver of GSM Mobile Stations (MS)s and Base Station Systems (BSS)s during DiscontinuousTransmission (DTX).For clarity, the description is structured according to the block diagrams in figures 1 and 4. Except in the case describedbelow, 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), theimplementation of the interfaces between the DTX Handlers and the Radio Sub System (RSS) as described in thepresent document together with all their flags is mandatory, being a part of the A-bis interface as described inGSM 08.61 [10].The DTX functions described in the present document are mandatory for implementation in all GSM MSs. The receiverrequirements are mandatory for implementation in all GSM BSSs, the transmitter requirements only for those wheredownlink DTX will be used.2ReferencesThe following documents contain provisions which, through reference in this text, constitute provisions of the presentdocument.· References are either specific (identified by date of publication, edition number, version number, etc.) ornon-specific.· For a specific reference, subsequent revisions do not apply.· For a non-specific reference, the latest version applies.· A non-specific reference to an ETS shall also be taken to refer to later versions published as an EN with the samenumber.[1]GSM 01.04: "Digital cellular telecommunication system (Phase 2+); Abbreviations and acronyms".[2]GSM 04.08: "Digital cellular telecommunication system (Phase 2+); Mobile radio interface layer 3specification".[3]GSM 05.05: "Digital cellular telecommunications system (Phase 2+); Radio transmission andreception".[4]GSM 05.08: "Digital cellular telecommunication system (Phase 2+); Radio subsystem linkcontrol".[5]GSM 06.02: "Digital cellular telecommunications system (Phase 2+); Half rate speech Part 1: Halfrate speech processing functions".[6]GSM 06.20: "Digital cellular telecommunications system (Phase 2+); Half rate speech; Half ratespeech transcoding".[7]GSM 06.21: "Digital cellular telecommunications system (Phase 2+); Half rate speech;Substitution and muting of lost frames for half rate speech traffic channels".[8]GSM 06.22: "Digital cellular telecommunications system (Phase 2+); Half rate speech; Comfortnoise aspects for half rate speech traffic channels".[9]GSM 06.42: "Digital cellular telecommunications system (Phase 2+); Half rate speech; VoiceActivity Detector (VAD) for half rate speech traffic channels".SIST EN 300 972 V6.0.1:2003

ETSIEN 300 972 V6.0.1 (1999-06)7GSM 06.41 version 6.0.1 Release 1997[10]GSM 08.61: "Digital cellular telecommunications system (Phase 2+); Inband control of remotetranscoders and rate adaptors for half rate traffic channels".[11]GSM 06.06: "Digital cellular telecommunications system (Phase 2+); Half rate speech Part 7:ANSI-C code for the GSM half rate speech codec".3Definitions, symbols and abbreviations3.1DefinitionsFor the purpose of the present document, the following 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= "1" (Bad Frame Indication) or with UFI= "1" (Unreliable FrameIndication) by the Radio Subsystem.frame: Time interval of 20 ms corresponding to the time segmentation of the half rate speech transcoder defined inGSM 06.20 (ETS 300 969) [6]), 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= "0" and UFI= "0" by the Radio Subsystem.GS averaging period: The period in which the quantized energy tweak parameters GS are averaged: it corresponds tothe hangover period.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 forupdating comfort noise parameters, but the frame conveys information that comfort noise generations should be startedor continued.lost SID frame: An unusable frame received when the RX DTX Handler is generating comfort noise and a
...