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TS 101 504 : 8.0.1

Current

Current

The latest, up-to-date edition.

DIGITAL CELLULAR TELECOMMUNICATIONS SYSTEM (PHASE 2+); INBAND TANDEM FREE OPERATION (TFO) OF SPEECH CODECS; SERVICE DESCRIPTION; STAGE 3

Available format(s)

Hardcopy , PDF

Language(s)

English

Intellectual Property Rights
Foreword
1 Scope
2 References
3 Definitions and Abbreviations
  3.1 Definitions
  3.2 Abbreviations
4 General Approach
  4.1 Background
  4.2 Principle of Tandem Free Operation
5 TFO Frame Structure
  5.1 TFO Frames for Full Rate and Enhanced Full Rate
  5.2 TFO Frame for Half Rate
6 TFO Message Structure
  6.1 Extendibility
  6.2 Regular and Embedded TFO Messages
  6.3 Cyclic Redundancy Check
  6.4 Definition of the TFO_REQ Messages
  6.5 Definition of the TFO_ACK Messages
  6.6 Definition of the TFO_TRANS Messages
  6.7 Definition of the TFO_NORMAL Message
  6.8 Definition of the TFO_FILL Message
  6.9 Definition of the TFO_DUP Message
  6.10 Definition of the TFO_SYL Message
  6.11 Specification of the TFO Messages for GSM
7 Time Alignment of TFO Frames and TFO Messages
  7.1 Time Alignment of TFO Messages
  7.2 Time Alignment of TFO Frames
  7.3 Time Alignment of TFO Frames to Downlink TRAU
      Frames
8 Processes for Tandem Free Operation
  8.1 Rx_TRAU Process
  8.2 Tx_TRAU Process
  8.3 Tx_TFO Process
  8.4 Rx_TFO Process
  8.5 TFO_Protocol Process
9 State Machine of the TFO_Protocol Process
  9.1 Initialisation
  9.2 Establishment
  9.3 Contact State
  9.4 Konnect State
  9.5 Operation State
  9.6 Local Handover
  9.7 Distant Handover, TFO Interruption
  9.8 Failure State
10 Detailed Description of TFO_Protocol
11 Codec Mismatch Resolution and Codec Optimization
Annex A (Normative): Inband Signalling Protocol:
                     Generic Structure
                     A.1 Generic Structure of Inband
                         Signalling Messages
                     A.2 Detailed Specification of
                         IS Messages
                     A.3 Keep_Open_Indication
                     A.4 Rules for Sending of IS Messages
                     A.5 IS_System_Identification_Block
Annex B (Informative): In Path Equipment: Generic Rules and
                       Guidelines
                       B.1 Types of In Path Equipment
                       B.2 IS_Compliant IPEs
                       B.3 IPE State Representation
                       B.4 IPE Error Handling
                       B.5 IPE Transmission Delay
                       B.6 Compliance to IS Messages
Annex C (Informative): The SDL model of the TFO protocol
Annex D (informative): Change history
History

Establishes the stage 3 description for the Tandem Free Operation feature which provides the capability to avoid using two GSM speech codecs in mobile to mobile speech calls. The primary aim is to realise improvements in speech quality. The TFO mode of operation could also be used to reduce inter-MSC transmission bandwidth requirements. This service description should be considered together with GSM 08.60 (Inband control of remote transcoders and rate adaptors for Enhanced Full Rate and Full Rate traffic channels) and GSM 08.61 (Inband control of remote transcoders and rate adaptors for Half Rate traffic channels).

Committee
3GPP SA
DocumentType
Standard
Pages
70
PublisherName
European Telecommunications Standards Institute
Status
Current

ETSI GSM 08.08 : 051200 DIGITAL CELLULAR TELECOMMUNICATIONS SYSTEM (PHASE 2+); MOBILE-SERVICES SWITCHING CENTRE - BASE STATION SYSTEM (MSC-BSS) INTERFACE LAYER 3 SPECIFICATION
ETSI GSM 01.04 : 050000 EUROPEAN DIGITAL CELLULAR TELECOMMUNICATION SYSTEM (PHASE 2); DEFINITIONS, ABBREVIATIONS AND ACRONYMS
ETSI GSM 06.31 : 4.0.4 DISCONTINUOUS TRANSMISSION (DTX) FOR FULL RATE SPEECH TRAFFIC CHANNELS
ETSI GSM 06.01 : 4.0.5 SPEECH PROCESSING FUNCTIONS: GENERAL DESCRIPTION
ETSI GSM 06.12 : 4.0.4 COMFORT NOISE ASPECTS FOR FULL RATE SPEECH TRAFFIC CHANNELS
ETSI GSM 06.10 : 4.0.2 GSM FULL RATE SPEECH TRANSCODING
ETSI GSM 06.20 : 4.2.1 DIGITAL CELLULAR TELECOMMUNICATIONS SYSTEM; HALF RATE SPEECH TRANSCODING
ETSI GSM 06.11 : 4.0.4 SUBSTITUTION AND MUTING OF LOST FRAMES FOR FULL-RATE SPEECH TRAFFIC CHANNELS
ETSI GSM 06.32 : 4.1.0 VOICE ACTIVITY DETECTION
ETSI GSM 03.05 : 4.0.1 TECHNICAL PERFORMANCE OBJECTIVES
ETSI GSM 08.60 : 4.0.1 INBAND CONTROL OF REMOTE TRANSCODERS AND RATE ADAPTORS

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