ETSI TS 148 060 V13.0.0 (2016-01)

Digital cellular telecommunications system (Phase 2+); In-band control of remote transcoders and rate adaptors for full rate traffic channels (3GPP TS 48.060 version 13.0.0 Release 13)

RTS/TSGG-0148060vd00

General Information

• Status: Published
• Publication Date: 21-Jan-2016
• Technical Committee: 3GPP GERAN 1 - Radio aspects
• Current Stage: 12 - Completion
• Due Date: 19-Jan-2016
• Completion Date: 22-Jan-2016

Standards Content (Sample)

ETSI TS 1148 060 V13.0.0 (201616-01)






TECHNICAL SPECIFICATIONION
Digital cellular telecocommunications system (Phahase 2+);
In-band control of remremote transcoders and rate a adaptors
for fullull rate traffic channels
(3GPP TS 48.0.060 version 13.0.0 Release 13 13)

R
GLOBAL SYSTTEME FOR
MOBILE COMMUUNNICATIONS

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3GPP TS 48.060 version 13.0.0 Release 13 1 ETSI TS 148 060 V13.0.0 (2016-01)



Reference
RTS/TSGG-0148060vd00
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GSM
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3GPP TS 48.060 version 13.0.0 Release 13 2 ETSI TS 148 060 V13.0.0 (2016-01)
Intellectual Property Rights
IPRs essential or potentially essential to the present document may have been declared to ETSI. The information
pertaining to these essential IPRs, if any, is publicly available for ETSI members and non-members, and can be found
in ETSI SR 000 314: "Intellectual Property Rights (IPRs); Essential, or potentially Essential, IPRs notified to ETSI in
respect of ETSI standards", which is available from the ETSI Secretariat. Latest updates are available on the ETSI Web
server (https://ipr.etsi.org/).
Pursuant to the ETSI IPR Policy, no investigation, including IPR searches, has been carried out by ETSI. No guarantee
can be given as to the existence of other IPRs not referenced in ETSI SR 000 314 (or the updates on the ETSI Web
server) which are, or may be, or may become, essential to the present document.
Foreword
This Technical Specification (TS) has been produced by ETSI 3rd Generation Partnership Project (3GPP).
The present document may refer to technical specifications or reports using their 3GPP identities, UMTS identities or
GSM identities. These should be interpreted as being references to the corresponding ETSI deliverables.
The cross reference between GSM, UMTS, 3GPP and ETSI identities can be found under
http://webapp.etsi.org/key/queryform.asp.
Modal verbs terminology
In the present document "shall", "shall not", "should", "should not", "may", "need not", "will", "will not", "can" and
"cannot" are to be interpreted as described in clause 3.2 of the ETSI Drafting Rules (Verbal forms for the expression of
provisions).
"must" and "must not" are NOT allowed in ETSI deliverables except when used in direct citation.
ETSI

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3GPP TS 48.060 version 13.0.0 Release 13 3 ETSI TS 148 060 V13.0.0 (2016-01)
Contents
Intellectual Property Rights . 2
Foreword . 2
Modal verbs terminology . 2
Foreword . 5
1 Scope . 5
2 References . 6
3 Abbreviations . 7
4 General Approach. 8
5 Frame Structure . 10
5.1 Frames for Speech Services. 10
5.1.1 Frames for Full Rate and Enhanced Full Rate Speech . 10
5.1.2 Frames for Adaptive Multi-Rate Speech (AMR-NB) . 11
5.1.3 Frames for Adaptive Multi-Rate Wideband Speech (AMR-WB) (16 kbit/s) . 11
5.1.4 Frames for Adaptive Multi-Rate Wideband Speech (AMR-WB) (32 kbit/s) . 11
5.1.5 Frames for Speech Codec Configuration Exchange . 12
5.2 O&M Frames . 13
5.3 Data Frames . 14
5.3.1 Data Frame (for Synchronisation) . 14
5.3.2 Extended data frame (E-TRAU : data transport) . 15
5.4 Idle Speech Frames . 16
5.5 Coding . 16
5.5.1 Coding of Frames for Speech Services . 17
5.5.1.1 Coding of Frames for Full Rate and Enhanced Full Rate Speech . 17
5.5.1.1.1 Coding of Control bits (C-bits) . 17
5.5.1.1.2 Coding of Data Bits (D-bits) . 18
5.5.1.1.3 Time Alignment Bits (T1…T4) . 18
5.5.1.2 Coding of Frames for Adaptive Multi-Rate Speech (AMR-NB) . 19
5.5.1.2.1 Coding of Control bits (C-bits) . 19
5.5.1.2.2 Coding of Data bits (D-bits) . 21
5.5.1.2.3 Time Alignment Bits (T1…T4) . 24
5.5.1.3 Coding of Frames for Adaptive Multi-Rate Wide Band Speech (AMR-WB) for 16kbit/s and
32kbit/s sub-multiplexing . 25
5.5.1.3.1 Coding of Control bits (C-bits) . 25
5.5.1.3.2 Coding of Data bits (D-bits) . 26
5.5.1.3.3 Time Alignment Bits (T1a…T4a) . 29
5.5.1.4 void . 29
5.5.1.5 Coding of Configuration Frames . 29
5.5.2 Coding of O&M Frames . 29
5.5.3 Coding of Data Frames . 30
5.5.4 Coding of Extended Data Frames . 30
5.5.5 Coding of Idle Speech Frames . 31
5.6 Order of Bit Transmission . 31
6 Procedures . 31
6.1 Remote Control of Transcoders and Rate Adaptors . 31
6.2 Resource Allocation . 32
6.3 Resource Release . 32
6.4 In Call Modification . 33
6.5 Transfer of Idle Frames, Handling of Missing Data . 33
6.5.1 In Full Rate data case . 33
6.5.2 In Full Rate speech case . 33
6.5.3 In Enhanced Full Rate speech case . 33
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3GPP TS 48.060 version 13.0.0 Release 13 4 ETSI TS 148 060 V13.0.0 (2016-01)
6.5.4 In Adaptive Multi-Rate speech case . 33
6.5.5 In Adaptive Multi-Rate Wideband speech case . 33
6.6 Procedures for Speech Services . 34
6.6.1 Time Alignment of Speech Service Frames . 34
6.6.1.1 Initial Time Alignment State . 34
6.6.1.2 The Static Time Alignment State . 35
6.6.1.2.1 Phase Alignment of Codec_Mode_Indication for AMR or AMR-WB . 35
6.6.1.3 Initiation at Resource Allocati on . 37
6.6.1.4 Time Alignment During Handover . 37
6.6.1.4.1 BSS External Handover . 37
6.6.1.4.2 BSS Internal Handover . 37
6.6.2 Procedures for Discontinuous Transmission (DTX) . 37
6.6.2.1 DTX procedures in the uplink direction . 38
6.6.2.2 DTX procedures in the downlink direction . 38
6.7 Procedures for Data Frames . 38
6.7.1 9.6 and 4.8 kbit/s channel coding . 38
6.7.1.1 The RAA Function . 39
6.7.1.2 The RA1/RA1' Function . 40
6.7.1.3 The RA2 Function . 40
6.7.1.4 Procedures for 8 kbit/s intermediate rate adaption rate . 40
6.7.1.5 Procedures for 16 kbit/s intermediate rate adaption rate . 40
6.7.1.6 Support of Non-Transparent Bearer Applications . 40
6.7.2 14.5 kbit/s channel coding . 41
6.7.2.1 The RAA" Function . 41
6.7.2.2 The RA1"/RAA' Function . 41
6.7.2.3 The RA2 Function . 41
6.8 Frame Synchronization . 41
6.8.1 Search for Frame Synchronization . 41
6.8.2 Frame Synchronization After Performing Downlink Timing Adjustments . 41
6.8.3 Frame Synchronization Monitoring and Recovery . 42
6.9 Correction/detection of bit errors on the terrestrial circuits . 43
6.9.1 Error Detection on the Control Bits . 43
6.9.1.1 General Procedure . 43
6.9.1.2 Frames for Speech Services . 43
6.9.2 Handling of frames received with errors . 44
6.9.2.1 In case of Full Rate speech . 44
6.9.2.2 In case of Enhanced Full Rate, Adaptive Multi-Rate and Adaptive Multi-Rate Wideband speech . 44
6.10 Procedures for Operation & Maintenance . 44
6.10.1 Transfer of O&M Information Between the TRAU and the BSC . 44
6.10.2 Procedures in the TRAU . 45
6.10.3 Procedures in the BSC . 45
6.10.3.1 Use of O&M Frames . 45
6.10.4 Procedures in the BTS . 45
Annex A (informative): Change History . 46
History . 47


ETSI

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3GPP TS 48.060 version 13.0.0 Release 13 5 ETSI TS 148 060 V13.0.0 (2016-01)
Foreword
rd
This Technical Specification has been produced by the 3 Generation Partnership Project (3GPP).
The contents of the present document are subject to continuing work within the TSG and may change following formal
TSG approval. Should the TSG modify the contents of the present document, it will be re-released by the TSG with an
identifying change of release date and an increase in version number as follows:
Version x.y.z
where:
x the first digit:
1 presented to TSG for information;
2 presented to TSG for approval;
3 or greater indicates TSG approved document under change control.
y the second digit is incremented for all changes of substance, i.e. technical enhancements, corrections,
updates, etc.
z the third digit is incremented when editorial only changes have been incorporated in the document.

ETSI

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3GPP TS 48.060 version 13.0.0 Release 13 6 ETSI TS 148 060 V13.0.0 (2016-01)
1 Scope
When 64 kbit/s traffic channels are used on the Abis interface, the speech shall be coded according to CCITT
Recommendation G.711 and the data rate adaptation shall be as specified in 3GPP TS 44.021 and 3GPP TS 48.020.
In the case where 16 kbit/s traffic channels are used for full rate speech, enhanced full rate speech, Adaptive Multi-Rate
speech, Adaptive Multi-Rate Wideband speech or full rate data service, then the present document shall apply for frame
structure and for control of remote transcoders and additional rate adaptors.
For Adaptive Multi-Rate speech the present document specifies the 16 kBit/s submultiplexing, both for the full and the
half rate traffic channels (TCH/AFS, TCH/AHS, TCH/WFS and O-TCH/WHS). The specification for 8 kBit/s
submultiplexing is given in 3GPP TS 48.061, both for the full and the half rate traffic channels (TCH/AFS and
TCH/AHS).
Additionally, the present document specifies the 32 kBit/s submultiplexing for Adaptive Multi-Rate Wideband speech.
However it reuses the frame structure of the 16 kBit/s submultiplexing for Adaptive Multi-Rate speech.
The use and general aspects of the Abis interface are given in 3GPP TS 48.051.
NOTE: The present document should be considered together with the 3GPP TS 06 series of specifications, 3GPP
TS 44.021 (Rate Adaptation on the MS-BSS Interface) and 3GPP TS 48.020 (Rate Adaptation on the
BS/MSC Interface).
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] 3GPP TS 21.905: "Vocabulary for 3GPP Specifications".
[2] 3GPP TS 44.006: "Mobile Station - Base Station System (MS - BSS) interface Data Link (DL)
layer specification".
[3] 3GPP TS 44.021: "Rate adaption on the Mobile Station
[4] Void.
[5] 3GPP TS 46.010: "Full rate speech; Transcoding".
[6] 3GPP TS 46.011: "Full rate speech; Substitution and muting of lost frames for full rate speech
channels".
[7] 3GPP TS 46.012: "Full rate speech; Comfort noise aspect for full rate speech traffic channels".
[8] 3GPP TS 46.031: "Full rate speech; Discontinuous Transmission (DTX) for full rate speech traffic
channels".
[9] 3GPP TS 46.032: "Voice Activity Detector (VAD)".
[10] 3GPP TS 48.020: "Rate adaption on the Base Station System - Mobile-services Switching Centre
(BSS - MSC) interface".
[11] 3GPP TS 48.051: "Base Station Controller - Base Transceiver Station (BSC - BTS) interface;
General aspects".
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3GPP TS 48.060 version 13.0.0 Release 13 7 ETSI TS 148 060 V13.0.0 (2016-01)
[12] 3GPP TS 48.054: "Base Station Controller - Base Transceiver Station (BSC - BTS) interface
Layer 1 structure of physical circuits".
[13] 3GPP TS 48.058: "Base Station Controller - Base Transceiver Station (BSC - BTS) interface;
Layer 3 specification".
[14] 3GPP TS 12.21: "Network Management (NM) procedures and message on the A-bis interface".
[15] CCITT Recommendation G.711: "Pulse code modulation (PCM) of voice frequencies".
[16] CCITT Recommendation I.460: "Multiplexing, rate adaption and support of existing interfaces".
[17] CCITT Recommendation V.110: "Support of data terminal equipments (DTEs) with V-Series
interfaces by an integrated services digital network".
[18] Void.
[19] 3GPP TS 46.060: "Enhanced Full rate speech transcoding".
[20] 3GPP TS 46.061: "Substitution and muting of lost frames for Enhanced Full rate speech channels".
[21] 3GPP TS 46.062: "Comfort noise aspect for Enhanced Full rate speech traffic channels".
[22] 3GPP TS 46.081: "Discontinuous Transmission (DTX) for Enhanced Full rate speech traffic
channel".
[23] 3GPP TS 46.082: "Voice Activity Detection (VAD)".
[24] Void.
[25] 3GPP TS 26.090: "Adaptive Multi-Rate speech transcoding".
[26] 3GPP TS 26.091: "Substitution and muting of lost frames for Adaptive Multi-Rate speech traffic
channels".
[27] 3GPP TS 26.092: "Comfort noise aspect for Adaptive Multi-Rate speech traffic channels".
[28] 3GPP TS 26.093: "Discontinuous Transmission (DTX) for Adaptive Multi-Rate speech traffic
channels".
[29] 3GPP TS 26.094: "Voice Activity Detection (VAD) for Adaptive Multi-Rate speech traffic
channels ".
[30] 3GPP TS 45.009: "Link Adaptation".
[31] 3GPP TS 48.061: "Inband control of remote transcoders and rate adaptors (half rate)".
[32] 3GPP TS 28.062: "Inband Tandem Free Operation (TFO) of Speech Codecs".
[33] 3G 26.171: "Digital cellular telecommunications system; Adaptive Multi-Rate Wideband speech
processing functions, General Description."
[34] 3G 26.190: "Digital cellular telecommunications system; Adaptive Multi-Rate Wideband speech
transcoding".
[35] 3G 26.191: "Digital cellular telecommunications system; Substitution and muting of lost frames
for Adaptive Multi-Rate Wideband speech traffic channels".
[36] 3G 26.192: "Digital cellular telecommunications system; Comfort noise aspect for Adaptive Multi-
Rate Wideband speech traffic channels".
[37] 3G 26.193: "Digital cellular telecommunications system; Discontinuous Transmission (DTX) for
Adaptive Multi-Rate Wideband speech traffic channels".
[38] 3G 26.194: "Digital cellular telecommunications system; Voice Activity Detection (VAD) for
Adaptive Multi-Rate Wideband speech traffic channels ".
ETSI

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3GPP TS 48.060 version 13.0.0 Release 13 8 ETSI TS 148 060 V13.0.0 (2016-01)
3 Abbreviations
Abbreviations used in the present document are listed in 3GPP TS 21.905. Additionally:
AMR Adaptive Multi-Rate
AMR-WB Adaptive Multi-Rate Wideband
CMC Codec_Mode_Command
CMI Codec_Mode_Indication
CMR Codec_Mode_Request
Onset Speech Onset Frame Classification
PAB Phase Alignment Bit
PAC Phase Alignment Command
RATSCCH Robust AMR Traffic Synchronised Control CHannel
RIF Request or Indication Flag
TAC Time Alignment Command
TAE Time Alignment Extension
TFO Tandem Free Operation
TFOE TFO Enable
UFE Uplink Frame Error
4 General Approach
When the transcoders/rate adaptors are positioned remote to the BTS, the information between the Channel Codec Unit
(CCU) and the remote Transcoder/Rate Adaptor Unit (TRAU) is transferred in frames with a fixed length of 320 bits
(20 ms). In the present document, these frames are denoted "TRAU frames". Within these frames, both the speech/data
and the TRAU associated control signals are transferred.
The Abis interface should be the same if the transcoder is positioned 1) at the MSC site of the BSS or if it is positioned
2) at the BSC site of the BSS. In case 1), the BSC should be considered as transparent for 16 kbit/s channels.
In case of 4,8 and 9,6 kbit/s channel coding when data is adapted to the 320 bit frames, a conversion function is required
in addition to the conversion/rate adaption specified in 3GPP TS 48.020. This function constitutes the RAA. In case of
14,5 kbit/s channel coding, no RAA rate adaption is required because V.110 framing is not used.
The TRAU is considered a part of the BSC, and the signalling between the BSC and the TRAU (e.g. detection of call
release, handover and transfer of O&M information) may be performed by using BSC internal signals. The signalling
between the CCU and the TRAU, using TRAU frames as specified in the present document, is mandatory when the
Abis interface is applied.
NOTE: If standard 64 kbit/s switching is used in the BSC, multiplexing according to CCITT Recommendation
I.460 should apply at both sides of the switch.
In figure 4.1, a possible configuration of the TRAU and the CCU is shown.
The functions inside the TRAU are:
- "Remote Transcoder and Rate Adaptor Control Function" (RTRACF);
- "Remote Speech Handler Function" (RSHF);
- The RAA function in case of 4.8 and 9.6 kbit/s channel coding;
- The RAA" function in case of 14.5 kbit/s channel coding;
- The RA2 function;
- The transcoder function.
- Optionally the TFO functions (see 3GPP TS 28.062).
The functions inside the CCU are:
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3GPP TS 48.060 version 13.0.0 Release 13 9 ETSI TS 148 060 V13.0.0 (2016-01)
- "Transcoder and Rate Adaptor Control Function" (TRACF);
- "Speech Handler Function" (SHF);
- The RAA function in case of 4.8 and 9.6 kbit/s channel coding;
- The RA1/RA1' function in case of 4.8 and 9.6 kbit/s channel coding;
- The RA1"/RAA" function in case of 14.5 kbit/s channel coding;
- The channel codec function;
- If AMR or AMR-WB is supported, the Link Adaptation (see 3GPP TS 45.009).
The present document will not describe the procedures inside the TRAU and the CCU. The layout in figure 4.1 is only
intended as a reference model.

Figure 4.1: Functional entities for handling of remote control of remote transcoders and rate
adaptors
ETSI

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3GPP TS 48.060 version 13.0.0 Release 13 10 ETSI TS 148 060 V13.0.0 (2016-01)
NOTE: This figure applies only for 4,8 and 9,6 kbit/s channel coding.
5 Frame Structure
5.1 Frames for Speech Services
5.1.1 Frames for Full Rate and Enhanced Full Rate Speech

Bit n
...