SIST EN 301 246 V4.0.1:2003
(Main)Digital cellular telecommunications system (Phase 2) (GSM); Substitution and muting of lost frames for Enhanced Full Rate (EFR) speech traffic channels (GSM 06.61 version 4.0.1)
General Information
- Abstract
EN created for GSM Phase2 MS type approval purposes (a revision of GSM Phase 2+ ETS)
- Status
- Published
- Publication Date
- 30-Nov-2003
- 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
Overview
SIST EN 301 246 V4.0.1:2003 is a Slovenian adoption of the European standard developed by ETSI for the Digital Cellular Telecommunications System (GSM) Phase 2. It specifies procedures for substitution and muting of lost frames on Enhanced Full Rate (EFR) speech traffic channels. The standard is an essential component in assuring voice quality and reliability in GSM networks, specifically addressing how the system should respond to lost or corrupted speech frames to minimize audio degradation or interruptions.
The guidelines outlined in this standard are mandatory for equipment seeking type approval in GSM Phase 2 environments, particularly for those supporting EFR speech codecs. By defining how receiver subsystems handle lost speech and silence descriptor (SID) frames, the standard enhances the subjective quality of voice calls under challenging radio conditions.
Key Topics
- Frame Substitution: Procedures used to replace lost speech frames with previously received valid data, aiming to mask transmission issues and maintain audio continuity.
- Muting of Lost Frames: Gradual attenuation techniques to silence output after multiple consecutive lost frames, preventing unwanted noise and signaling channel degradation to the user.
- Error Detection Mechanisms: Utilization of Bad Frame Indication (BFI) flags, derived from cyclic redundancy checks (CRCs), to identify lost or corrupted speech and SID frames.
- Discontinuous Transmission (DTX): Integration with the RX DTX handler for efficient handling of speech and comfort noise during losses.
- SID Frame Handling: Methods for substituting and muting lost SID frames to maintain or gracefully fade comfort noise generation.
Applications
This standard is critical for ensuring the interoperability, reliability, and quality of GSM voice services, especially in scenarios with high error rates or challenging radio conditions. Key applications include:
- Base Station Systems (BSS) & Mobile Stations (MS): All equipment implementing EFR speech traffic channels must comply with these procedures to achieve GSM compliance and type approval.
- GSM Network Quality Assurance: Operators use this standard to maintain user-perceived voice quality, reducing artifacts such as clicks, pops, or disruptive noise caused by lost frames.
- Speech Codec Development: Developers of EFR speech codec solutions utilize these guidelines to ensure robust performance in real-world GSM networks.
- Receiver Algorithm Design: Implementation in mobile handset and base station firmware to provide seamless user experience despite occasional data corruption.
Related Standards
The content and procedures described in SIST EN 301 246 V4.0.1:2003 reference and complement several other GSM and ETSI standards, including:
- GSM 05.03 (ETS 300 575): Channel coding for GSM systems
- GSM 06.60 (EN 301 245): Enhanced Full Rate (EFR) speech transcoding
- GSM 06.81 (EN 301 248): Discontinuous transmission procedures for EFR speech channels
- GSM 08.60 (ETS 300 737): Inband control of remote transcoders and rate adaptors for EFR and full-rate channels
Incorporating SIST EN 301 246 V4.0.1:2003 into equipment design and testing ensures full alignment with European type approval requirements for GSM Phase 2 networks, supporting both legacy and evolving digital cellular telecommunications infrastructure.
Keywords: GSM standard, EFR speech codec, lost frame substitution, muting procedure, digital cellular telecommunications, type approval, speech quality, mobile communications
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Frequently Asked Questions
SIST EN 301 246 V4.0.1:2003 is a standard published by the Slovenian Institute for Standardization (SIST). Its full title is "Digital cellular telecommunications system (Phase 2) (GSM); Substitution and muting of lost frames for Enhanced Full Rate (EFR) speech traffic channels (GSM 06.61 version 4.0.1)". This standard covers: EN created for GSM Phase2 MS type approval purposes (a revision of GSM Phase 2+ ETS)
EN created for GSM Phase2 MS type approval purposes (a revision of GSM Phase 2+ ETS)
SIST EN 301 246 V4.0.1:2003 is classified under the following ICS (International Classification for Standards) categories: 33.070.50 - Global System for Mobile Communication (GSM). The ICS classification helps identify the subject area and facilitates finding related standards.
SIST EN 301 246 V4.0.1:2003 is associated with the following European legislation: Standardization Mandates: T-172. When a standard is cited in the Official Journal of the European Union, products manufactured in conformity with it benefit from a presumption of conformity with the essential requirements of the corresponding EU directive or regulation.
SIST EN 301 246 V4.0.1:2003 is available in PDF format for immediate download after purchase. The document can be added to your cart and obtained through the secure checkout process. Digital delivery ensures instant access to the complete standard document.
Standards Content (Sample)
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.Digital cellular telecommunications system (Phase 2) (GSM); Substitution and muting of lost frames for Enhanced Full Rate (EFR) speech traffic channels (GSM 06.61 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 301 246 Version 4.0.1SIST EN 301 246 V4.0.1:2003en01-december-2003SIST EN 301 246 V4.0.1:2003SLOVENSKI
STANDARD
European Telecommunications Standards InstituteEN 301 246 V4.0.1 (1997-12)European Standard (Telecommunications series)Digital cellular telecommunications system (Phase 2);Substitution and muting of lost frames for EnhancedFull Rate (EFR) speech traffic channels(GSM 06.61 version 4.0.1)GLOBAL SYSTEM
FOR MOBILE COMMUNICATIONSRSIST EN 301 246 V4.0.1:2003
EN 301 246 V4.0.1 (1997-12)2GSM 06.61 version 4.0.1ReferenceDEN/SMG-110661P (bjc0200o.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.: +33 4 92 94 42 00
Fax: +33 4 93 65 47 16Siret 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=secretariatInternetsecretariat@etsi.frhttp://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 301 246 V4.0.1:2003
EN 301 246 V4.0.1 (1997-12)3GSM 06.61 version 4.0.1ContentsIntellectual Property Rights.4Foreword.41Scope.52Normative references.53Definitions and abbreviations.53.1Definitions.53.2Abbreviations.54General.65Requirements.65.1Error detection.65.2Lost speech frames.65.3First lost SID frame.65.4Subsequent lost SID frames.66Example solution.66.1Example solution for substitution and muting of lost speech frames.66.2Example solution for substitution and muting of lost SID frames.9History.10SIST EN 301 246 V4.0.1:2003
EN 301 246 V4.0.1 (1997-12)4GSM 06.61 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 defines a frame substitution and muting procedure which is used by the Receive (RX) DiscontinuousTransmission (DTX) handler when one or more lost speech or Silence Descriptor (SID) frames are received from theRadio Sub System (RSS) within the digital cellular telecommunications system.This EN corresponds to GSM technical specification, GSM 06.61, 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 301 246 V4.0.1:2003
EN 301 246 V4.0.1 (1997-12)5GSM 06.61 version 4.0.11ScopeThis EN defines a frame substitution and muting procedure which shall be used by the Receive (RX) DiscontinuousTransmission (DTX) handler when one or more lost speech or Silence Descriptor (SID) frames are received from theRadio Sub System (RSS).The requirements of this EN are mandatory for implementation in all GSM Base Station Systems (BSS)s and MobileStations (MS)s capable of supporting the enhanced Full Rate speech traffic channel. It is not mandatory to follow the bitexact implementation outlined in this EN and the corresponding C-source code.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 05.03 (ETS 300 575): "Digital cellular telecommunications system (Phase 2); Channelcoding".[2]GSM 06.60 (EN 301 245): "Digital cellular telecommunications system; Enhanced Full Rate(EFR) speech transcoding".[3]GSM 06.81 (EN 301 248): "Digital cellular telecommunications system; Discontinuoustransmission (DTX) for Enhanced Full Rate (EFR) speech traffic channels".[4]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 and abbreviations3.1Defi
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