SIST ETS 300 729 E1:2003
(Main)Digital cellular telecommunications system; Discontinuous Transmission (DTX) for Enhanced Full Rate (EFR) speech traffic channels (GSM 06.81)
Digital cellular telecommunications system; Discontinuous Transmission (DTX) for Enhanced Full Rate (EFR) speech traffic channels (GSM 06.81)
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)
General Information
Standards Content (Sample)
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.Digital cellular telecommunications system; Discontinuous Transmission (DTX) for Enhanced Full Rate (EFR) speech traffic channels (GSM 06.81)33.070.50Globalni sistem za mobilno telekomunikacijo (GSM)Global System for Mobile Communication (GSM)ICS:Ta slovenski standard je istoveten z:ETS 300 729 Edition 1SIST ETS 300 729 E1:2003en01-december-2003SIST ETS 300 729 E1:2003SLOVENSKI
STANDARD
SIST ETS 300 729 E1:2003
EUROPEANETS 300 729TELECOMMUNICATIONMarch 1997STANDARDSource: ETSI TC-SMGReference: DE/SMG-020681ICS:33.020Key words:Digital cellular telecommunications system, Global System for Mobile communications (GSM)GLOBAL SYSTEM
FOR MOBILE COMMUNICATIONSRDigital cellular telecommunications system;Discontinuous Transmission (DTX) for EnhancedFull Rate (EFR) speech traffic channels(GSM 06.81)ETSIEuropean Telecommunications Standards InstituteETSI SecretariatPostal address: F-06921 Sophia Antipolis CEDEX - FRANCEOffice address: 650 Route des Lucioles - Sophia Antipolis - Valbonne - FRANCEX.400: c=fr, a=atlas, p=etsi, s=secretariat - Internet: secretariat@etsi.frTel.: +33 4 92 94 42 00 - Fax: +33 4 93 65 47 16Copyright Notification: No part may be reproduced except as authorized by written permission. The copyright and theforegoing restriction extend to reproduction in all media.© European Telecommunications Standards Institute 1997. All rights reserved.SIST ETS 300 729 E1:2003
Page 2ETS 300 729 (GSM 06.81 version 5.1.2): March 1997Whilst 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.SIST ETS 300 729 E1:2003
Page 3ETS 300 729 (GSM 06.81 version 5.1.2): March 1997ContentsForeword.51Scope.72Normative references.73Definitions, symbols and abbreviations.83.1Definitions.83.2Symbols.93.3Abbreviations.94General.94.1General organization.95Transmit (TX) side.105.1General operation.105.1.1Functions of the TX DTX handler.105.1.2Functions of the TX Radio Subsystem.126Receive (RX) side.136.1General operation.136.1.1Functions of the RX radio subsystem.136.1.2Functions of the RX DTX handler.14History.15SIST ETS 300 729 E1:2003
Page 4ETS 300 729 (GSM 06.81 version 5.1.2): March 1997Blank pageSIST ETS 300 729 E1:2003
Page 5ETS 300 729 (GSM 06.81 version 5.1.2): March 1997ForewordThis European Telecommunication Standard (ETS) has been produced by the Special Mobile Group(SMG) Technical Committee of the European Telecommunications Standards Institute (ETSI).This ETS describes the general baseband operation of Enhanced Full Rate speech traffic channels in thetransmitter and in the receiver of GSM Mobile Stations and Base Station Systems during DiscontinuousTransmission (DTX) within the digital cellular telecommunications system.This ETS corresponds to GSM technical specification, GSM 06.81, version 5.1.2.Transposition datesDate of adoption:28 February 1997Date of latest announcement of this ETS (doa):30 June 1997Date of latest publication of new National Standardor endorsement of this ETS (dop/e):31 December 1997Date of withdrawal of any conflicting National Standard (dow):31 December 1997SIST ETS 300 729 E1:2003
Page 6ETS 300 729 (GSM 06.81 version 5.1.2): March 1997Blank pageSIST ETS 300 729 E1:2003
Page 7ETS 300 729 (GSM 06.81 version 5.1.2): March 19971ScopeThis European Telecommunication Standard (ETS) gives a description of the general baseband operationof Enhanced Full Rate speech traffic channels in the transmitter and in the receiver of GSM MobileStations (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 thecase described next, this structure of distributing the various functions between system entities is notmandatory for implementation, as long as the operation on the air interface and on the speech decoderoutput 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 asdescribed in GSM 08.60 (ETS 300 737) [13].The DTX functions described in this technical specification are mandatory for implementation in the GSMMSs. The receiver requirements are mandatory for implementation in all GSM BSSs, the transmitterrequirements only for those where downlink DTX will be used.2Normative referencesThis ETS incorporates by dated and undated reference, provisions from other publications. Thesenormative references are cited at the appropriate places in the text and the publications are listedhereafter. For dated references, subsequent amendments to or revisions of any of these publicationsapply to this ETS only when incorporated in it by amendment or revision. For undated references, thelatest 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-Ccode 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) speechtraffic channels".[11]GSM 06.62 (ETS 300 728): "Digital cellular telecommunications system;Comfort noise aspects for Enhanced Full Rate (EFR) speech traffic channels".SIST ETS 300 729 E1:2003
Page 8ETS 300 729 (GSM 06.81 version 5.1.2): March 1997[12]GSM 06.82 (ETS 300 730): "Digital cellular telecommunications system; VoiceActivity 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 forEnhanced Full Rate (EFR) and full rate traffic channels".3Definitions, symbols and abbreviations3.1DefinitionsFor the purposes of this ETS, 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 flag ="1" (Bad Frame Indication) by the Radio Subsystem.frame: Time interval of 20 msec. corresponding to the time segmentation of the Enhanced Full Ratespeech 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 SPflag ="1".invalid SID frame: An accepted SID frame which was not classified as valid SID frame. This frame is notvalid for updating comfort noise parameters, but the frame conveys information that comfort noisegenerations should be started or continued.lost SID frame: An unusable frame received when the RX DTX handler is generating comfort noise and aSID frame is expected (Time Alignment Flag, TAF="1").lost speech frame: An unusable frame received when the RX DTX handler is passing on traffic framesdirectly to the speech decoder.SID code word: Fixed bit pattern defined in GSM 06.62 (ETS 300 728) [11], for labelling a traffic frame asa SID frame.SID field: The bit positions defined in GSM 06.62 (ETS 300 728) [11], of the SID codeword within a SIDframe.SID frame: Frame characterized by the SID (SIlence Descriptor) code word. It conveys information on theacoustic background noise.SP flag: Boolean flag, generated by the TX DTX handler, indicating the presence of a speech frame ("1")or the presence of a SID frame ("0").speech frame: Traffic frame that cannot be classified as a SID frame.TAF flag: Time Alignment Flag. Boolean flag, marks with TAF=1 those traffic frames that are aligned withthe SACCH multiframe structure (see GS
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