DIGITAL CELLULAR TELECOMMUNICATIONS SYSTEM (PHASE 2+) - TANDEM FREE OPERATION (TFO) - SERVICE DESCRIPTION - STAGE 2

Available format(s)

Hardcopy , PDF

Language(s)

English

Publisher

European Telecommunications Standards Institute

Intellectual Property Rights
Foreword
1 Scope
2 References
3 Definitions and abbreviations
  3.1 Definitions
  3.2 Abbreviations
4 Main Concepts
5 TFO Architecture and Transmission Mechanism
  5.1 TFO Access Interfaces and Reference Points
  5.2 General In-band Transmission Mechanism for TFO
  5.3 High-Level Functions Required for TFO
6 Model of operation
  6.1 Overview
  6.2 TFO establishment phase
  6.3 Transparency of transmission equipments
  6.4 Modification of speech codec
  6.5 TFO operation
7 Compatibility Issues
8 Interactions with Other Services
  8.1 General
  8.2 Support of DTMF
9 Operational Aspects
Annex A (Informative): Change history
History

Defines the stage 2 description for the Tandem Free Operation feature which gives the capability to avoid using two GSM speech codecs in mobile to mobile speech calls. The main aim is to achieve improvements in speech quality. The TFO mode of operation could also be used to reduce inter-MSC transmission bandwidth requirements.

Committee	SMG 11
DocumentType	Standard
Pages	15
PublisherName	European Telecommunications Standards Institute
Status	Current

ETSI GSM 01.04 : 050000	EUROPEAN DIGITAL CELLULAR TELECOMMUNICATION SYSTEM (PHASE 2); DEFINITIONS, ABBREVIATIONS AND ACRONYMS
ETSI GSM 08.60 : 4.0.1	INBAND CONTROL OF REMOTE TRANSCODERS AND RATE ADAPTORS
ETSI GSM 08.61 : 4.0.1	DIGITAL CELLULAR TELECOMMUNICATIONS SYSTEM (PHASE 2+); IN-BAND CONTROL OF REMOTE TRANSCODERS AND RATE ADAPTORS FOR HALF RATE TRAFFIC CHANNELS