SIST ETS 300 727 E1:2003
(Main)Digital cellular telecommunications system; Substitution and muting of lost frames for Enhanced Full Rate (EFR) speech traffic channels (GSM 06.61 version 5.1.2)
General Information
- Abstract
This draft European Telecommunication Standard (ETS) defines a frame substitution and muting procedure which shall be used by the Receive (RX) Discontinuous Transmission (DTX) handler when one or more lost speech or Silence Descriptor (SID) frames are received from the Radio Sub System (RSS). The requirements of this ETS are mandatory for implementation in all GSM Base Station Systems (BSS)s and Mobile Stations (MS)s capable of supporting the enhanced full-rate speech traffic channel. It is not mandatory to follow the bit exact implementation outlined in this specification and the corresponding C-source code.
- 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
The SIST ETS 300 727 E1:2003 standard defines the procedure for frame substitution and muting of lost frames in Enhanced Full Rate (EFR) speech traffic channels within the digital cellular telecommunications system (GSM). This European Telecommunication Standard is essential for implementing robust speech quality even when errors or lost frames occur during mobile voice transmission. It addresses how GSM Base Station Systems (BSS) and Mobile Stations (MS) handle lost speech and Silence Descriptor (SID) frames, ensuring that user experience is maintained and annoying noise artifacts are prevented.
The requirements established by this standard are mandatory for all GSM systems supporting EFR speech channels, contributing to the consistency, reliability, and interoperability of GSM networks worldwide.
Key Topics
- Frame Substitution and Muting: Procedures to conceal lost frames and prevent sound artifacts caused by transmission errors or interruptions.
- Discontinuous Transmission (DTX) Handling: Guidelines for the RX DTX handler to manage lost speech or SID frames received from the Radio Sub System (RSS).
- Error Detection: Utilization of Bad Frame Indication (BFI) based on Cyclic Redundancy Checks (CRCs) and additional mechanisms for identifying corrupted frames.
- Speech Quality Protection: Methods for substituting missing frames with attenuated or repeated speech parameters to preserve the perceived audio quality.
- SID Frame Handling: Techniques for the substitution and gradual muting of lost SID frames, especially in silence periods, to smoothly transition to comfort noise.
- State Machine Operation: A logic mechanism that manages the substitution process based on the number of consecutive lost frames.
Applications
The procedures specified in SIST ETS 300 727 E1:2003 are critical in the following contexts:
- GSM Voice Services: Ensuring high-quality speech transmission over mobile networks, even under adverse radio conditions where frame losses are frequent.
- Mobile Handset and Base Station Design: Enabling manufacturers to implement consistent and interoperable error-handling mechanisms across devices.
- Network Optimization: Allowing operators to deliver reliable voice services by adhering to standardized muting and substitution procedures.
- Comfort Noise Generation: Maintaining user comfort and system efficiency during periods of silence by accurately handling SID frames.
By applying these procedures, GSM networks can protect against unpleasant audio artifacts, such as clicks or bursts of noise, that would otherwise result from lost or corrupted speech frames.
Related Standards
The following standards are closely related and referenced for the comprehensive implementation of bad frame handling in GSM EFR channels:
- GSM 05.03 (ETS 300 575): Channel coding for digital cellular telecommunications systems.
- GSM 06.60 (ETS 300 726): Enhanced Full Rate (EFR) speech transcoding procedures.
- GSM 06.81 (ETS 300 729): Discontinuous transmission (DTX) for EFR speech traffic channels.
- GSM 08.60 (ETS 300 737): Inband control of remote transcoders and rate adaptors for EFR and full rate traffic channels.
Adherence to SIST ETS 300 727 E1:2003 and these related standards ensures robust speech service performance, minimizes latency due to error correction, and harmonizes GSM voice communications across different network equipment and devices.
By following SIST ETS 300 727 E1:2003, stakeholders in the mobile telecommunications industry can effectively address the challenges of frame loss, maintain GSM speech quality, and ensure seamless user experiences, supporting the ongoing global reliance on GSM for digital voice communication.
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Frequently Asked Questions
SIST ETS 300 727 E1:2003 is a standard published by the Slovenian Institute for Standardization (SIST). Its full title is "Digital cellular telecommunications system; Substitution and muting of lost frames for Enhanced Full Rate (EFR) speech traffic channels (GSM 06.61 version 5.1.2)". This standard covers: This draft European Telecommunication Standard (ETS) defines a frame substitution and muting procedure which shall be used by the Receive (RX) Discontinuous Transmission (DTX) handler when one or more lost speech or Silence Descriptor (SID) frames are received from the Radio Sub System (RSS). The requirements of this ETS are mandatory for implementation in all GSM Base Station Systems (BSS)s and Mobile Stations (MS)s capable of supporting the enhanced full-rate speech traffic channel. It is not mandatory to follow the bit exact implementation outlined in this specification and the corresponding C-source code.
This draft European Telecommunication Standard (ETS) defines a frame substitution and muting procedure which shall be used by the Receive (RX) Discontinuous Transmission (DTX) handler when one or more lost speech or Silence Descriptor (SID) frames are received from the Radio Sub System (RSS). The requirements of this ETS are mandatory for implementation in all GSM Base Station Systems (BSS)s and Mobile Stations (MS)s capable of supporting the enhanced full-rate speech traffic channel. It is not mandatory to follow the bit exact implementation outlined in this specification and the corresponding C-source code.
SIST ETS 300 727 E1:2003 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 ETS 300 727 E1:2003 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 ETS 300 727 E1:2003 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)
SLOVENSKI STANDARD
01-december-2003
'LJLWDOQLFHOLþQLWHOHNRPXQLNDFLMVNLVLVWHP±1DGRPHãþDQMHLQXWLãDQMHL]JXEOMHQLK
RNYLURYYSURPHWQLKNDQDOLKL]EROMãDQHJDJRYRUDVSROQRKLWURVWMR ()5 *60
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Digital cellular telecommunications system; Substitution and muting of lost frames for
Enhanced Full Rate (EFR) speech traffic channels (GSM 06.61 version 5.1.2)
Ta slovenski standard je istoveten z: ETS 300 727 Edition 1
ICS:
33.070.50 Globalni sistem za mobilno Global System for Mobile
telekomunikacijo (GSM) Communication (GSM)
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.
EUROPEAN ETS 300 727
TELECOMMUNICATION April 1997
STANDARD
Source: ETSI TC-SMG Reference: DE/SMG-020661
ICS: 33.020
Key words: Digital cellular telecommunications system, Global System for Mobile communications (GSM)
R
GLOBAL SYSTEM FOR
MOBILE COMMUNICATIONS
Digital cellular telecommunications system;
Substitution and muting of lost frames for Enhanced
Full Rate (EFR) speech traffic channels
(GSM 06.61 version 5.1.2)
ETSI
European Telecommunications Standards Institute
ETSI Secretariat
Postal address: F-06921 Sophia Antipolis CEDEX - FRANCE
Office address: 650 Route des Lucioles - Sophia Antipolis - Valbonne - FRANCE
X.400: c=fr, a=atlas, p=etsi, s=secretariat - Internet: secretariat@etsi.fr
Tel.: +33 4 92 94 42 00 - Fax: +33 4 93 65 47 16
Copyright Notification: No 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.
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ETS 300 727 (GSM 06.61 version 5.1.2): April 1997
Whilst 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.
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ETS 300 727 (GSM 06.61 version 5.1.2): April 1997
Contents
Foreword .5
1 Scope .7
2 Normative references.7
3 Definitions and abbreviations .7
3.1 Definitions .7
3.2 Abbreviations .7
4 General.8
5 Requirements.9
5.1 Error detection .9
5.2 Lost speech frames .9
5.3 First lost SID frame.9
5.4 Subsequent lost SID frames.9
6 Example solution.9
6.1 Example solution for substitution and muting of lost speech frames.9
6.2 Example solution for substitution and muting of lost SID frames .11
History.12
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ETS 300 727 (GSM 06.61 version 5.1.2): April 1997
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ETS 300 727 (GSM 06.61 version 5.1.2): April 1997
Foreword
This European Telecommunication Standard (ETS) has been produced by the Special Mobile Group
(SMG) Technical Committee of the European Telecommunications Standards Institute (ETSI).
This ETS defines a frame substitution and muting procedure which is used by the Receive (RX)
Discontinuous Transmission (DTX) handler when one or more lost speech or Silence Descriptor (SID)
frames are received from the Radio Sub System (RSS) within the digital cellular telecommunications
system.
This ETS corresponds to GSM technical specification, GSM 06.61, version 5.1.2.
Transposition dates
Date of adoption: 28 February 1997
Date of latest announcement of this ETS (doa): 31 July 1997
Date of latest publication of new National Standard
or endorsement of this ETS (dop/e): 31 January 1998
Date of withdrawal of any conflicting National Standard (dow): 31 January 1998
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ETS 300 727 (GSM 06.61 version 5.1.2): April 1997
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ETS 300 727 (GSM 06.61 version 5.1.2): April 1997
1 Scope
This European Telecommunication Standard (ETS) defines a frame substitution and muting procedure
which shall be used by the Receive (RX) Discontinuous Transmission (DTX) handler when one or more
lost speech or Silence Descriptor (SID) frames are received from the Radio Sub System (RSS).
The requirements of this ETS are mandatory for implementation in all GSM Base Station Systems (BSS)s
and Mobile Stations (MS)s capable of supporting the enhanced Full Rate speech traffic channel. It is not
mandatory to follow the bit exact implementation outlined in this ETS and the corresponding C-source
code.
2 Normative references
This ETS incorporates by dated and undated reference, provisions from other publications. These
normative references are cited at the appropriate places in the text and the publications are listed
hereafter. For dated references, subsequent amendments to or revisions of any of these publications
apply to this ETS only when incorporated in it by amendment or revision. 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); Channel coding".
[2] GSM 06.60 (ETS 300 726): "Digital cellular telecommunications system;
Enhanced Full Rate (EFR) speech transcoding".
[3] GSM 06.81 (ETS 300 729): "Digital cellular telecommunications system;
Discontinuous transmission (DTX) for Enhanced Full Rate (EFR) speech traffic
channels".
[4] GSM 08.60 (ETS 300 737): "Digital cellular telecommunications system
(Phase 2+); Inband control of remote transcoders and rate adaptors for
Enhanced Full Rate (EFR) and full rate traffic channels".
3 Definitions and abbreviations
3.1 Definitions
For the purposes of this ETS, the following definition applies:
5-point median operation: Consists of sorting the 5 elements belonging to the set for which the median
operation is to be performed in an ascending order according to their values, and selecting the third
largest value of the sorted set as the median value.
Further definitions of terms used in this ETS can be found in
...