ETSI EN 301 248 V4.0.1 (1997-12)

Digital cellular telecommunications system (Phase 2) (GSM); Discontinuous Transmission (DTX) for Enhanced Full Rate (EFR) speech traffic channels (GSM 06.81 version 4.0.1)

DEN/SMG-110681P

Digitalni celični telekomunikacijski sistem (faza 2) – Nezvezno oddajanje (DTX) pri prometnih kanalih za izboljšani govor s polno hitrostjo (EFR) (GSM 06.81, različica 4.0.1)

General Information

• Status: Published
• Publication Date: 30-Dec-1997
• Technical Committee: SMG 11 - Speech Aspects
• Current Stage: 12 - Completion
• Due Date: 09-Jan-1998
• Completion Date: 31-Dec-1997
• Mandate: T-172
• Ref Project: SIST EN 301 248 V4.0.1:2003 - Digital cellular telecommunications system (Phase 2) (GSM); Discontinuous Transmission (DTX) for Enhanced Full Rate (EFR) speech traffic channels (GSM 06.81 version 4.0.1)

Standards Content (Sample)

2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.Digital cellular telecommunications system (Phase 2) (GSM); Discontinuous Transmission (DTX) for Enhanced Full Rate (EFR) speech traffic channels (GSM 06.81 version 4.0.1)33.070.50Globalni sistem za mobilno telekomunikacijo (GSM)Global System for Mobile Communication (GSM)ICS:Ta slovenski standard je istoveten z:EN 301 248 Version 4.0.1SIST EN 301 248 V4.0.1:2003en01-december-2003SIST EN 301 248 V4.0.1:2003SLOVENSKI
STANDARD
European Telecommunications Standards InstituteEN 301 248 V4.0.1 (1997-12)European Standard (Telecommunications series)Digital cellular telecommunications system (Phase 2);Discontinuous Transmission (DTX) for EnhancedFull Rate (EFR) speech traffic channels(GSM 06.81 version 4.0.1)GLOBAL SYSTEM
FOR MOBILE COMMUNICATIONSRSIST EN 301 248 V4.0.1:2003

EN 301 248 V4.0.1 (1997-12)2GSM 06.81 version 4.0.1ReferenceDEN/SMG-110681P (bk00200o.PDF)KeywordsDigital cellular telecommunications system,Global System for Mobile communications (GSM)ETSI SecretariatPostal 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° 7803/88X.400c= fr; a=atlas; p=etsi; s=[e-mail]://www.etsi.frCopyright 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 1997.All rights reserved.SIST EN 301 248 V4.0.1:2003

EN 301 248 V4.0.1 (1997-12)3GSM 06.81 version 4.0.1ContentsIntellectual Property Rights.4Foreword.41Scope.52Normative references.53Definitions, symbols and abbreviations.63.1Definitions.63.2Symbols.73.3Abbreviations.74General.74.1General organization.75Transmit (TX) side.85.1General operation.85.1.1Functions of the TX DTX handler.85.1.2Functions of the TX Radio Subsystem.106Receive (RX) side.116.1General operation.116.1.1Functions of the RX radio subsystem.116.1.2Functions of the RX DTX handler.12History.13SIST EN 301 248 V4.0.1:2003

EN 301 248 V4.0.1 (1997-12)4GSM 06.81 version 4.0.1Intellectual 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 ETR 314: "Intellectual Property Rights (IPRs); Essential, or potentially Essential, IPRs notified to ETSI in respect ofETSI standards", which is available free of charge from the ETSI Secretariat. Latest updates are available on the ETSIWeb server (http://www.etsi.fr/ipr).Pursuant to the ETSI Interim IPR Policy, no investigation, including IPR searches, has been carried out by ETSI. Noguarantee can be given as to the existence of other IPRs not referenced in ETR 314 (or the updates onhttp://www.etsi.fr/ipr) which are, or may be, or may become, essential to the present document.ForewordThis European Standard (Telecommunications series) has been produced by the Special Mobile Group (SMG)Technical Committee of the European Telecommunications Standards Institute (ETSI).This EN describes the general baseband operation of Enhanced Full Rate speech traffic channels in the transmitter andin the receiver of GSM Mobile Stations and Base Station Systems during Discontinuous Transmission (DTX) within thedigital cellular telecommunications system.This EN corresponds to GSM technical specification, GSM 06.81, version 4.0.0.National transposition datesDate of adoption of this EN:19 December 1997Date of latest announcement of this EN (doa):31 March 1998Date of latest publication of new National Standardor endorsement of this EN (dop/e):30 September 1998Date of withdrawal of any conflicting National Standard (dow):30 September 1998SIST EN 301 248 V4.0.1:2003

EN 301 248 V4.0.1 (1997-12)5GSM 06.81 version 4.0.11ScopeThis EN gives a description of the general baseband operation of Enhanced Full 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 describednext, this structure of distributing the various functions between system entities is not mandatory for implementation, aslong 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 this ENtogether 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. Thereceiver requirements are mandatory for implementation in all GSM BSSs, the transmitter requirements only for thosewhere downlink DTX will be used.2Normative referencesThis EN incorporates by dated and undated reference, provisions from other publications. These normative referencesare cited at the appropriate places in the text and the publications are listed hereafter. For dated references, subsequentamendments to or revisions of any of these publications apply to this EN only when incorporated in it by amendment orrevision. 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 andacronyms".[2]GSM 04.08 (ETS 300 557): "Digital cellular telecommunications system (Phase 2); Mobile radiointerface layer 3 specification".[3]GSM 05.03 (ETS 300 575): "Digital cellular telecommunications system (Phase 2); Channelcoding".[4]GSM 05.05 (ETS 300 577): "Digital cellular telecommunications system (Phase 2); Radiotransmission and reception".[5]GSM 05.08 (ETS 300 578): "Digital cellular telecommunications system (Phase 2); Radiosubsystem link control".[6]GSM 06.51 (EN 301 243): "Digital cellular telecommunications system; Enhanced Full Rate(EFR) speech processing functions; General description".[7]GSM 06.53 (EN 301 244): "Digital cellular telecommunications system; ANSI-C code for theGSM Enhanced Full Rate (EFR) speech codec".[8]GSM 06.54 (EN 301 250): "Digital cellular telecommunications system (Phase 2); Test vectors forthe GSM Enhanced Full Rate (EFR) speech codec".[9]GSM 06.60 (EN 301 245): "Digital cellular telecommunications system; Enhanced Full Rate(EFR) speech transcoding".[10]GSM 06.61 (EN 301 246): "Digital cellular telecommunications system; Substitution and mutingof lost frame for Enhanced Full Rate (EFR) speech traffic channels".[11]GSM 06.62 (EN 301 247): "Digital cellular telecommunications system; Comfort noise aspects forEnhanced Full Rate (EFR) speech traffic channels".[12]GSM 06.82 (EN 301 249): "Digital cellular telecommunications system; Voice Activity Detector(VAD) for Enhanced Full Rate (EFR) speech traffic channels".SIST EN 301 248 V4.0.1:2003

EN 301 248 V4.0.1 (1997-12)6GSM 06.81 version 4.0.1[13]GSM 08.60 (ETS 300 737): "Digital cellular telecommunications system (Phase 2+); Inbandcontrol of remote transcoders and rate adaptors for Enhanced Full Rate (EFR) and full rate trafficchannels".3Definitions, symbols and abbreviations3.1DefinitionsFor the purposes of this EN, 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 Rate speech transcoder(GSM 06.60 (EN 301 245) [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 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 SID frame isexpected (Time Alignment Flag, TAF="1").lost speech frame: An unusable frame received when the RX DTX handler is passing on traffic frames directly to thespeech decoder.SID code word: Fixed bit pattern defined in GSM 06.62 (EN 301 247) [11], for labelling a traffic frame as a SIDframe.SID field: The bit position
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