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Content for  TS 28.062  Word version:  16.0.0

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1  ScopeWord‑p. 11
The present document contains the service description for the in-band signalling protocol for the support of Tandem Free Operation of the Half Rate, Full Rate, Enhanced Full Rate, Adaptive Multi Rate narrowband and Adaptive Multi Rate Wide-Band speech codec types in GSM and GSM-evolved 3G systems.
2  References
The following documents contain provisions, which, through reference in this text, constitute provisions of the present document.
  • References are either specific (identified by date of publication, edition number, version number, etc.) or non specific.
  • For a specific reference, subsequent revisions do not apply.
  • For a non-specific reference, the latest version applies. In the case of a reference to a 3GPP document (including a GSM document), a non-specific reference implicitly refers to the latest version of that document in the same Release as the present document.
[1]  TS 22.053   "Digital cellular telecommunication system (Phase 2+); Tandem Free Operation (TFO); Service Description; Stage 1".
[2]  TS 23.053   "Digital cellular telecommunication system (Phase 2+); Tandem Free Operation (TFO); Service Description; Stage 2".
[3]  TS 48.060   "Digital cellular telecommunication system (Phase 2+); Inband control of remote transcoders and rate adaptors for full rate traffic channels".
[4]  TS 48.061   "Digital cellular telecommunication system (Phase 2+); In-band Control of Remote Transcoders and Rate Adaptors for half rate traffic channels".
[5]  TS 46.010   "Digital cellular telecommunications system (Phase 2+); Full rate speech transcoding".
[6]  TS 46.020   "Digital cellular telecommunications system (Phase 2+); Half rate speech transcoding".
[7]  TS 46.060   "Digital cellular telecommunications system (Phase 2+); Enhanced Full Rate (EFR) speech transcoding".
[8]  TS 26.090   "Mandatory Speech Codec speech processing functions AMR Speech Codec - Transcoding functions".
[9]  TS 45.009   "Digital cellular telecommunications system (Phase 2+); Link Adaptation".
[10]  TS 48.008   "Digital cellular telecommunications system (Phase 2+); Mobile-services Switching Centre - Base Station System (MSC - BSS) interface; Layer 3 specification".
[11]  TS 48.054   "Digital cellular telecommunication system (Phase 2+); Base Station Controller - Base Transceiver Station (BSC - BTS) interface; Layer 1 structure of physical circuits".
[12]  TS 48.058   "Digital Cellular telecommunications system (Phase 2+), "Base Station Controller - Base Transceiver Station (BSC - BTS) interface; Layer 3 specification".
[13]  ITU-T Recommendation G.711: "Pulse code modulation (PCM) of voice frequencies".
[14]  TS 44.018   "Mobile radio interface layer 3 specification; Radio Resource Control Protocol".
[15]  TS 23.153   "Out of Band Transcoder Control; Stage 2".
[16]  TS 29.232   "Media Gateway Controller (MGC) - Media Gateway (MGW) Interface;
Stage 3"
[17]  TS 25.415   "UTRAN Iu interface User plane protocols"
[18]  TS 26.171   AMR-WB Speech Codec; General Description
[19]  TS 26.190   AMR-WB Speech Codec; Transcoding Functions
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3  Definitions and abbreviationsWord‑p. 12
3.1  Definitions
For the purposes of the present document, the following terms and definitions apply:
Transcoder:
device that converts the encoding of information from one particular scheme to a different one
Tandem Free Operation:
call configuration where a transcoder device is physically present in the signal path, but the transcoding functions are bypassed
Transcoder Free Operation:
call configuration where no transcoder device is physically present and hence no control or conversion or other functions associated with it are activated
Compressed Speech Samples:
speech samples coded according to one of the Speech Codec Types supported by the TFO specification
PCM Samples:
speech samples coded according to ITU-T Recommendation G.711 A-Law or μ-Law at 64 kbit/s
Speech Codec Type:
speech Codec among those supported by this TFO specification: GSM_FR, GSM_HR, GSM_EFR, FR_AMR, HR_AMR, OHR_AMR, UMTS_AMR, UMTS_AMR_2, FR_AMR-WB, UMTS_AMR-WB, OFR_AMR-WB, OHR_AMR-WB
AMR Speech Codec Type:
one of the following Speech Codec Types: FR_AMR, HR_AMR, UMTS_AMR, UMTS_AMR_2, FR_AMR-WB, UMTS_AMR-WB, OFR_AMR-WB, OHR_AMR-WB
AMR-NB Speech Codec Type:
one of the following Speech Codec Types: FR_AMR, HR_AMR, UMTS_AMR, UMTS_AMR_2, OHR_AMR.
AMR-WB speech Codec Type:
one of the following Speech Codec Types: UMTS_AMR-WB, FR_AMR-WB, OFR_AMR-WB, OHR_AMR-WB
Non-AMR Speech Codec Type:
one of the following Speech Codec Types: GSM_FR, GSM_HR, or GSM_EFR
Speech Codec Configuration:
set of parameters defining the operational conditions of a Speech Codec Type
EXAMPLE:
The Speech Codec Configuration of an AMR Speech Codec Type defines the ACS, the SCS…
TRAU Frame or TRAU Speech Frame:
refer to a Speech Frame carried over the Abis/Ater Interface in a GSM network
TFO Frame or TFO Speech Frame:
refer to the Speech Frames exchanged between the Transcoders when Tandem Free Operation is active
Abis/Ater:
applies to a GSM network where either the GSM Abis or Ater interfaces are used, depending on the location of the Transcoder and Rate Adaptor Units
Other definitions are contained in [1] and [3].
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3.2  AbbreviationsWord‑p. 13
For the purposes of the present document, the following abbreviations apply:
ACS
Active Codec Set
ACT
Active Codec Type
AMR
Adaptive Multi-Rate
ATVN
AMR-TFO Version Number
BSC
Base Station Controller
BSS
Base Station Sub-system
BTS
Base Transceiver Station
CACS
Common Active Codec Set
CSCS
Common Supported Codec Set
DACS
Distant Active Codec Set
DSCS
Distant Supported Codec Set
EFR
Enhanced Full Rate
FQI
Frame Quality Index
FR
Full Rate
HOM
Hand-Over-Mode
HR
Half Rate
IACS
Immediate Active Codec Set
ICM
Initial Codec Mode
IPE
In Path Equipment
LACS
Local Active Codec Set
LSB
Least Significant Bit
LSCS
Local Supported Codec Set
MACS
Maximum number of Codecs Modes in the Active Codec Set
MGw
Media Gateway
MS
Mobile Station
MSB
Most Significant Bit
MSC
Mobile Switching Centre
NB
Narrow-Band
OACS
Optimised Active Codec Set
OD
Optimal or Distant Configuration requested
OM
Optimisation Mode supported
PCM sample
8-bit value representing the A_Law or μ_Law coded sample of a speech or audio signal; sometimes used to indicate the time interval between two PCM samples (125μs).
PCM
Pulse_Coded_Modulation
PCM_Alaw_Idle
PCM sample with value 0x54
PCM_Alaw_Idle
PCM sample with value 0x54.
PCM_Alaw_Silence
PCM sample with value 0xD5
PCM_Alaw_Silence
PCM sample with value 0xD5.
PCM_Idle
either PCM_Alaw_Idle, or PCM_μLaw_Idle, dependent on application
PCM_Silence
either PCM_Alaw_Silence, or PCM_μLaw_Silence, dependent on application
PCM_μLaw_Idle
PCM sample with value 0x00
PCM_μLaw_Idle
PCM sample with value 0x00.
PCM_μLaw_Silence
PCM sample with value 0xFF
PCM_μLaw_Silence
PCM sample with value 0xFF.
PDU
Packet Data Unit
PLMN
Public Land Mobile Network
RAN
Radio Access Network
RATSCCH
Robust AMR Traffic Synchronised Control Channel
RIF
Request Indication Flag
RNC
Radio Network Controller
SCR
Source Controlled Rate
SCS
Supported Codec Set
T_Bits
Time Alignment Bits
Tbfh
Time delay Bad Frame Handling
TC
Transcoder
TCME
TFO Circuit Multiplication Equipment
TFO
Tandem Free Operation
TFO
Tandem Free Operation
TFO_ACK
TFO Acknowledgement Message
TFO_DUP
TFO (Half) Duplex Mode Message
TFO_DUP
TFO (Half) Duplex Mode Message
TFO_FILL
TFO Fill Message
TFO_NORMAL
TFO Normal Mode Message
TFO_REQ
TFO Request Message
TFO_SYL
TFO Sync Lost Message
TFO_TRANS
TFO Transparent Mode Message
TRAU
Transcoder and Rate Adaptor Unit
TrFO
Transcoder Free Operation
TSM
TFO Setup Mode
Tultfo
Time delay UpLink TFO
UE
User Equipment
WB
WideBand
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