SIST EN 300 729 V8.0.1:2003

• Abstract:

  Updated to version 8.0.0 CRs from SMG#31

• 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 300 729 V8.0.1 (2000-11) - Digital cellular telecommunications system (Phase 2+) (GSM); Discontinuous Transmission (DTX) for Enhanced Full Rate (EFR) speech traffic channels (GSM 06.81 version 8.0.1 Release 1999)

SIST EN 300 729 V8.0.1:2003 is the Slovenian adoption of ETSI EN 300 729 Version 8.0.1. It specifies Discontinuous Transmission (DTX) for Enhanced Full Rate (EFR) speech traffic channels in the Global System for Mobile Communication (GSM) Phase 2+ system. In practice, it tells implementers how speech activity, pauses, and comfort-noise signalling are handled on these channels.

What does SIST EN 300 729 V8.0.1:2003 specify?

SIST EN 300 729 V8.0.1:2003 specifies the DTX behaviour for EFR speech traffic channels in GSM. The standard is focused on how transmission changes between active speech and pause periods, so equipment can reduce unnecessary radio transmission while keeping the call experience stable.

The document is organized around the operational sequence of speech frames, pause frames, and Silence Descriptor (SID) handling. The visible material shows timing diagrams and state transitions, which are the key tools for understanding how the transmitter and receiver move through speech bursts, hangover periods, SID averaging periods, and SID repetition.

What are the key requirements of SIST EN 300 729 V8.0.1:2003?

SIST EN 300 729 V8.0.1:2003 describes DTX as a frame-based process. The figures use 20 ms frames, so implementers need to align speech activity decisions and SID handling to that timing.

• The standard distinguishes between speech bursts and pauses. This matters because the transmitter does not treat every frame the same way - it must decide when speech has really ended and when a pause has begun.
• It uses a Voice Activity Detection (VAD) flag. In practice, this is the core decision signal for determining whether a frame is treated as speech or silence-related traffic.
• It uses an SP flag and a hangover period. The hangover keeps speech classification going briefly after the last speech frame, which helps avoid cutting off trailing speech too early.
• It defines SID averaging periods during pauses. These periods are used to form the background-noise description, so the receiver can maintain comfort noise instead of hearing abrupt silence.
• The diagrams show new SID updating and previous SID repetition. This matters because the receiver must know when to accept an updated SID and when to keep using the last valid one.
• The transition from the end of speech to the first pause frame is explicitly shown. That transition is important for encoder and decoder design because it is where the DTX state changes.
• The standard covers repeated SID frames over successive pause frames. In practice, that means the network and terminal have to keep the comfort-noise information alive during a sustained pause.

What terms does SIST EN 300 729 V8.0.1:2003 define?

• Discontinuous Transmission (DTX) - a method that suppresses transmission during speech pauses to reduce radio activity.
• Enhanced Full Rate (EFR) - the GSM speech traffic channel type covered by the standard.
• Global System for Mobile Communication (GSM) - the mobile communications system family in which the specification applies.
• Voice Activity Detection (VAD) - the mechanism used to decide whether a frame contains speech.
• Speech/Pause (SP) flag - the indicator shown in the diagrams that marks speech versus pause handling.
• Silence Descriptor (SID) - the frame type used to carry background-noise information during pauses.
• Hangover - the short continuation of speech state after speech ends, used to avoid premature switching.
• Speech burst - a run of consecutive speech frames before the system moves into pause handling.

Who uses SIST EN 300 729 V8.0.1:2003?

SIST EN 300 729 V8.0.1:2003 is used by GSM speech codec designers, radio-access equipment engineers, protocol implementers, and conformance test labs. It is also relevant for quality and verification teams checking that DTX behaviour matches the expected speech, pause, and SID handling on EFR channels.

What changed in SIST EN 300 729 V8.0.1:2003 from the previous edition?

SIST EN 300 729 V8.0.1:2003 updates version 8.0.0 with change requests from SMG#31.

What does the SIST EN 300 729 V8.0.1:2003 document contain?

The document contains timing diagrams that show how 20 ms frames move from speech to pause and back again. It also shows how VAD and SP flags behave across the end of a speech burst, including the hangover period.

The figures illustrate SID averaging periods, new SID updates, and repetition of the previous SID during later pause frames. That material is what implementers use when designing encoders, decoders, and test cases for DTX behaviour.

The front matter identifies the ETSI origin, the Slovenian adoption, and the document’s GSM subject area. It also carries the standard copyright and distribution notices that apply to the text.

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 8.0.1 Release 1999)33.070.50Globalni sistem za mobilno telekomunikacijo (GSM)Global System for Mobile Communication (GSM)ICS:Ta slovenski standard je istoveten z:EN 300 729 Version 8.0.1SIST EN 300 729 V8.0.1:2003en01-december-2003SIST EN 300 729 V8.0.1:2003SLOVENSKI
STANDARD
5SIST EN 300 729 V8.0.1:2003
ETSIETSIEN300729V8.0.1(2000-11)2(GSM06.81version8.0.1Release1999)ReferenceREN/SMG-110681Q8KeywordsDigitalcellulartelecommunicationssystem,GlobalSystemforMobilecommunications(GSM)ETSI650RoutedesLuciolesF-06921SophiaAntipolisCedex-FRANCETel.:[phone]Fax:[phone]SiretN°34862356200017-NAF742CAssociationàbutnonlucratifenregistréeàlaSous-PréfecturedeGrasse(06)N°7803/88ImportantnoticeIndividualcopiesofthepresentdocumentcanbedownloadedfrom:http://www.etsi.orgThepresentdocumentmaybemadeavailableinmorethanoneelectronicversionorinprint.Inanycaseofexistingorperceiveddifferenceincontentsbetweensuchversions,thereferenceversionisthePortableDocumentFormat(PDF).Incaseofdispute,thereferenceshallbetheprintingonETSIprintersofthePDFversionkeptonaspecificnetworkdrivewithinETSISecretariat.Usersofthepresentdocumentshouldbeawarethatthedocumentmaybesubjecttorevisionorchangeofstatus.InformationonthecurrentstatusofthisandotherETSIdocumentsisavailableathttp://www.etsi.org/tb/status/Ifyoufinderrorsinthepresentdocument,sendyourcommentto:[e-mail]opartmaybereproducedexceptasauthorizedbywrittenpermission.Thecopyrightandtheforegoingrestrictionextendtoreproductioninallmedia.©EuropeanTelecommunicationsStandardsInstitute2000.Allrightsreserved.SIST EN 300 729 V8.0.1:2003

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