ETSI TS 148 061 V13.0.0 (2016-01)

ETSI TS 1148 061 V13.0.0 (201616-01)

TECHNICAL SPECIFICATIONION
Digital cellular telecocommunications system (Phahase 2+);
In-band control of remremote transcoders and rate a adaptors
for halalf rate traffic channels
(3GPP TS 48.0.061 version 13.0.0 Release 13 13)

R
GLOBAL SYSTTEME FOR
MOBILE COMMUUNNICATIONS
3GPP TS 48.061 version 13.0.0 Release 13 1 ETSI TS 148 061 V13.0.0 (2016-01)

Reference
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ETSI
3GPP TS 48.061 version 13.0.0 Release 13 2 ETSI TS 148 061 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
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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
3GPP TS 48.061 version 13.0.0 Release 13 3 ETSI TS 148 061 V13.0.0 (2016-01)
Contents
Intellectual Property Rights . 2
Foreword . 2
Modal verbs terminology . 2
Foreword . 5
1 Scope . 6
2 References . 6
3 Definitions and abbreviations . 7
3.1 Definitions . 7
3.2 Abbreviations . 7
4 General approach . 8
5 Frame structure . 10
5.1 16 kbit/s submultiplexing . 10
5.1.1 Frames for Speech Services . 10
5.1.1.1 Frame for Half Rate speech . 10
5.1.1.2 Frames for Adaptive Multi-Rate Speech . 10
5.1.2 Data frame . 11
5.1.3 O&M frame . 12
5.1.4 Coding . 12
5.1.4.1 Coding of frames for speech services. 13
5.1.4.1.1 Coding of frames for Half Rate speech Control bits (C-bits): . 13
5.1.4.1.2 Coding of frames for Adaptive Multi-Rate speech . 14
5.1.4.2 Coding of data frames . 14
5.1.4.3 Coding of O&M frames . 15
5.1.5 Order of Bit Transmission . 15
5.2 8 kbit/s submultiplexing . 16
5.2.1 Frames for Speech Services . 16
5.2.1.1 Frame for Half Rate Speech . 16
5.2.1.2 Frames for Adaptive Multi-Rate Speech . 16
5.2.1.2.1 Frame for Lower Codec Modes . 16
5.2.1.2.2 Speech frame for Codec Mode 6,70 kBit/s . 17
5.2.1.2.3 Speech frame for Codec Mode 7,40 kBit/s . 17
5.2.1.2.4 Speech frame for Codec Mode 7,95 kBit/s . 18
5.2.1.3 Frames for Speech Codec Configuration Exchange . 18
5.2.2 Data frame . 19
5.2.3 O&M frame . 19
5.2.4 Coding . 20
5.2.4.1 Coding for Half Rate Speech and Half Rate Data Services . 20
5.2.4.1.1 Uplink coding . 20
5.2.4.1.2 Downlink coding . 22
5.2.4.2 Coding for Adaptive Multi-Rate Speech . 23
5.2.4.2.1 No_Speech Frame . 23
5.2.4.2.2 Speech Frames for 4,75, 5,15 and 5,90 kBit/s . 24
5.2.4.2.3 Speech Frame for 6,70 kBit/s . 25
5.2.4.2.4 Speech Frame for 7,40 kBit/s . 26
5.2.4.2.5 Speech Frame for 7,95 kBit/s . 26
5.2.5 Order of Bit Transmission . 26
6 Procedures . 27
6.1 Remote Control of Transcoders and Rate Adaptors . 27
6.2 Resource Allocation . 27
6.3 Resource Release . 27
6.4 In Call Modification . 28
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6.5 Transfer of Idle Frames, Handling of missing data . 28
6.6 Procedures for Speech Frames . 28
6.6.1 Time Alignment of Speech Frames . 28
6.6.1.1 16 kbit/s submultiplexing . 29
6.6.1.1.1 Downlink Time Alignment . 29
6.6.1.1.2 Uplink Time Alignment . 31
6.6.1.1.3 Initiation at Resource Allocation . 31
6.6.1.1.4 Time Alignment during Handover. 31
6.6.1.2 8 kbit/s submultiplexing . 31
6.6.1.2.1 Downlink Time Alignment . 31
6.6.1.2.2 Uplink Time Alignment . 33
6.6.1.2.3 Initiation at Resource allocation . 34
6.6.1.2.4 Time Alignment during handover . 34
6.6.2 Procedures for Discontinuous Transmission (DTX) . 34
6.6.2.1 DTX procedures in the uplink direction . 34
6.6.2.2 DTX procedures in the downlink direction . 35
6.7 Procedures for Data Frames . 35
6.7.1 The RAA Function . 35
6.7.2 The RA1/RA1' Function . 36
6.7.3 The RA2 Function . 36
6.7.4 Procedures for 8 kbit/s intermediate rate adaption rate . 36
6.7.5 Support of Non-Transparent Bearer Applications . 37
6.8 Frame Synchronization . 37
6.8.1 16 kbit/s submultiplexing . 37
6.8.1.1 Search for Frame Synchronization . 37
6.8.1.2 Frame Synchronization After Performing Downlink Timing Adjustments . 37
6.8.1.3 Frame Synchronization Monitoring and Recovery . 37
6.8.2 8 kbit/s submultiplexing . 38
6.8.2.1 Search for Frame Synchronization . 38
6.8.2.1.1 For Half Rate speech and data . 38
6.8.2.1.2 For Adaptive Multi-Rate speech . 38
6.8.2.2 Frame Synchronization Monitoring and Recovery . 39
6.8.2.2.1 For Half Rate speech and data . 39
6.8.2.2.2 For Adaptive Multi-Rate speech . 39
6.9 Correction/detection of bit errors . 39
6.9.1 16 kbit/s submultiplexing . 39
6.9.1.1 Error Detection on the Control Bits . 39
6.9.1.1.1 General Procedure . 39
6.9.1.1.2 Frames for Half Rate speech . 40
6.9.1.2 Handling of frames received with errors for Half Rate speech and data . 40
6.9.2 8 kbit/s submultiplexing . 40
6.9.2.1 Error Detection on the Control Bits . 40
6.9.2.2 Handling of frames received with errors . 41
6.10 Procedures for Operation & Maintenance . 41
6.10.1 Transfer of O&M Information Between the TRAU and the BSC . 41
6.10.2 Procedures in the TRAU . 41
6.10.3 Procedures in the BSC . 41
6.10.3.1 Use of O&M Frames . 41
6.10.4 Procedures in the BTS . 42
Annex A (informative): Change History . 43
History . 44

ETSI
3GPP TS 48.061 version 13.0.0 Release 13 5 ETSI TS 148 061 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
3GPP TS 48.061 version 13.0.0 Release 13 6 ETSI TS 148 061 V13.0.0 (2016-01)
1 Scope
The present document describes the protocol between the Base Transceiver Station (BTS) and the remote
Transcoder/Rate Adaption Unit (TRAU) for speech and data on half rate traffic channel (TCH/H).
For Half Rate speech and half rate data the protocol is specified for 8 kbit/s and 16 kbit/s submultiplexing scheme.
For Adaptive Multi-Rate speech the present document specifies the 8 kBit/s submultiplexing, both for the full and the
half rate traffic channels (TCH/AFS and TCH/AHS). The specification for 16 kBit/s submultiplexing is given in Rec
3GPP TS 48.060, both for the full and the half rate traffic channels (TCH/AFS and TCH/AHS).
The present document should be considered together with the 3GPP TS 46 series, 3GPP TS 44.021 (Rate Adaption on
the MS-BSS Interface) and 3GPP TS 48.020 (Rate Adaption on the BTS/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 01.02: "Digital cellular telecommunication system (Phase 2+); General description of a
GSM Public Land Mobile Network (PLMN)".
[2] 3GPP TS 21.905: "Vocabulary for 3GPP Specifications".
[3] 3GPP TS 44.021: "Rate adaption on the Mobile Station - Base Station System (MS - BSS)
interface".
[4] 3GPP TS 45.003: "Channel coding".
[5] 3GPP TS 46.021: "Half rate speech; Substitution and muting of lost frames for half rate speech
traffic channels".
[6] 3GPP TS 46.022: "Half rate speech; Comfort noise aspects for half rate speech traffic channels".
[7] 3GPP TS 46.041: "Half rate speech; Discontinuous Transmission (DTX) for half rate speech
traffic channels".
[8] 3GPP TS 46.042: "Half rate speech; Voice Activity Detector (VAD) for half rate speech traffic
channels".
[9] 3GPP TS 48.008: "Mobile-services Switching Centre – Base Station System (MSC-BSS)
interface; Layer 3 specification".
[10] 3GPP TS 48.020: "Rate adaption on the Base Station System - Mobile-services Switching Centre
(BSS - MSC) interface".
[11] 3GPP TS 48.052: "Base Station Controller - Base Transceiver Station (BSC - BTS) interface;
Interface principles".
[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".
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[14] 3GPP TS 12.21: "Digital cellular telecommunication system (Phase 2); Network Management
(NM) procedures and messages on the A-bis interface".
[15] ITU-T Recommendation I.460: "Multiplexing, rate adaption and support of existing interfaces".
[16] ITU-T Recommendation V.110: "Support of data terminal equipments (DTEs) with V-Series
interfaces by an integrated services digital network".
[24] 3GPP TS 26.071: "Adaptive Multi-Rate speech processing functions, General Description."
[25] 3GPP TS 26.090: "Adaptive Multi-Rate speech transcoding".
[26] Void.
[27] 3GPP TS 26.092: "Comfort noise aspect for Adaptive Multi-Rate speech traffic channels".
[28] Void.
[29] Void.
[30] Void.
[31] 3GPP TS 48.060: "Inband control of remote transcoders and rate adaptors".
[32] 3GPP TS 48.062: "Inband Tandem Free Operation (TFO) of Speech Codecs".
[33] 3GPP TS 46.020: "Half Rate Speech Transcoding".
3 Definitions and abbreviations
3.1 Definitions
No specific definitions apply to the present document.
3.2 Abbreviations
For the purposes of the present document, the following abbreviations apply:
ACS Active_Codec_Set
AMR Adaptive Multi-Rate
BSC Base Station Controller
BTS Base Transceiver Station
CCU Channel Codec Unit
CMC Codec_Mode_Command
CMI Codec_Mode_Indication
CMR Codec_Mode_Request
DFE Downlink Frame Error
ICM Initial_Codec_Mode
PAB Phase Alignment Bit
PAC Phase Alignment Command
RA Rate Adaption
RIF Request or Indication Flag
TAC Time Alignment Command
TAE Time Alignment Extension
TFO Tandem Free Operation
TFOE TFO Enable
TRAU Transcoder and Rate Adaption Unit
UFE Uplink Frame Error
Other abbreviations used in the present document are listed in 3GPP TS 21.905.
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3GPP TS 48.061 version 13.0.0 Release 13 8 ETSI TS 148 061 V13.0.0 (2016-01)
4 General approach
The TRAU shall be controlled by the BTS when it is positioned remote from the BTS. In this case, the speech/data
information and TRAU control signals exchanged between the Channel Codec Unit (CCU) in the BTS and the TRAU
shall be transferred in frames denoted "TRAU frames".
The TRAU frames may be carried by either 16 kbit/s traffic channels or 8 kbit/s channels. The choice of the traffic
channel bit rate or submultiplexing scheme is operator dependent.
The TRAU frames have a fixed length of:
- 160 bits (20 ms) when 8 kbit/s submultiplexing is used;
- 320 bits (20 ms) when 16 kbit/s submultiplexing is used.
The protocol between the BTS and the TRAU should be the same if the TRAU is positioned either at the MSC site or at
the BSC site. In the first case, the BSC should be considered as transparent for 16 kbit/s and 8 kbit/s channels.
The TRAU is considered a part of the BSC when the TRAU is remote from the BTS (see 3GPP TS 48.052), 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. However, the signalling between the CCU and the TRAU, using
TRAU frames as specified in the present document, is mandatory when the TRAU is remote from the BTS.
For data transfer, a conversion function is required, in addition to the conversion/rate adaption specified in 3GPP TS
48.020, to adapt ITU-T V.110 frames to the TRAU data frames. This function constitutes the RAA.
NOTE: If standard 64 kbit/s switching is used in the BSC, multiplexing according to ITU-T Recommendation
I.460 should apply at both sides of the switch.
A possible configuration of the TRAU and the CCU is shown in figure 4.1.
The functions inside the TRAU are:
- "Remote Transcoder and Rate Adaptor Control Function" (RTRACF);
- "Remote Speech Handler Function" (RSHF);
- the RAA function;
- the RA2 function;
- the transcoder function.
The functions inside the CCU are:
- "Transcoder and Rate Adaptor Control Function" (TRACF);
- "Speech Handler Function" (SHF);
- the RAA function;
- the RA1/RA1' function;
- the channel codec function.
The present document does not describe the procedures inside the TRAU and the CCU. The layout in figure 4.1 is only
intended as a reference model.
ETSI
3GPP TS 48.061 version 13.0.0 Release 13 9 ETSI TS 148 061 V13.0.0 (2016-01)
Remote
Transcoder Speech
Speech
Function Handler
Handler
(note) Function
Function
Speech
Speech
8kbit/s
Remote 160bit/20ms
Transcoder
Transcoder
Channel
and RA
and RA
Codec
Control
Control
Function
Function
Function
Radio
64kbit/s
16 kbit/s
L3 control
frames
320bit/20ms signals
Data
RA2 RAA RAA RA1 RA1'
Data
Control
Speech/Data
NOTE: This technical specification assumes the DTX handler function to be part of the Transcoder Function.

Figure 3GPP TS 48.061/4.1: Functional entities for handling of control
of remote transcoders and rate adaptors
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3GPP TS 48.061 version 13.0.0 Release 13 10 ETSI TS 148 061 V13.0.0 (2016-01)
5 Frame structure
5.1 16 kbit/s submultiplexing
5.1.1 Frames for Speech Services
5.1.1.1 Frame for Half Rate speech

Bit number
Octet no.
1 2 3 4 5 6 7 8
1 0 0 0 0 0 0 0 0
2 0 0 0 0 0 0 0 0
3 1 C1 C2 C3 C4 C5 C6 C7
4 C8 C9 C10 C11 C12 C13 C14 C15
5 1 UFI D1 D2 D3 D4 D5 D6
6 D7 D8 D9 D10 D11 D12 D13 D14
7 1 D15 D16 D17 D18 D19 D20 D21
8 D22 D23 D24 D25 D26 D27 D28 D29
9 1 D30 D31 D32 D33 D34 D35 D36
10 D37 D38 D39 D40 D41 D42 D43 D44
11 1 CRC2 CRC1 CRC0 D45 D46 D47 D48
12 D49 D50 D51 D52 D53 D54 D55 D56
13 1 D57 D58 D59 D60 D61 D62 D63
14 D64 D65 D66 D67 D68 D69 D70 D71
15 1 D72 D73 D74 D75 D76 D77 D78
16 D79 D80 D81 D82 D83 D84 D85 D86
17 1 D87 D88 D89 D90 D91 D92 D93
18 D94 D95 D96 D97 D98 D99 D100 D101
19 1 D102 D103 D104 D105 D106 D107 D108
20 D109 D110 D111 D112 1 1 1 1
21 1 1 1 1 1 1 1 1
22 1 1 1 1 1 1 1 1
23 1 1 1 1 1 1 1 1
24 1 1 1 1 1 1 1 1
25 1 1 1 1 1 1 1 1
26 1 1 1 1 1 1 1 1
27 1 1 1 1 1 1 1 1
28 1 1 1 1 1 1 1 1
29 1 1 1 1 1 1 1 1
30 1 1 1 1 1 1 1 1
31 1 1 1 1 1 1 1 1
32 1 1 1 1 1 1 1 1
33 1 1 1 1 1 1 1 1
34 1 1 1 1 1 1 1 1
35 1 1 1 1 1 1 1 1
36 1 1 1 1 1 1 1 1
37 1 1 1 1 1 1 1 1
38 1 1 1 1 1 1 1 1
39 1 1 1 1 1 1 C16 C17
40 C18 C19 C20 C21 T1 T2 T3 T4

5.1.1.2 Frames for Adaptive Multi-Rate Speech
See 3GPP TS 48.060 for16 kBit/s submultiplexing.
ETSI
3GPP TS 48.061 version 13.0.0 Release 13 11 ETSI TS 148 061 V13.0.0 (2016-01)
5.1.2 Data frame
Bit number
Octet no. 1 2 3 4 5 6 7 8
1 0 0 0 0 0 0 0 0
2 0 0 0 0 0 0 0
3 1 C1 C2 C3 C4 C5 C6 C7
4 C8 C9 C10 C11 C12 C13 C14 C15
5 1 D1 D2 D3 D4 D5 D6 D7
6 1 D8 D9 D10 D11 D12 D13 D14
7 1 D15 D16 D17 D18 D19 D20 D21
8 1 D22 D23 D24 D25 D26 D27 D28 Data frame
9 1 D29 D30 D31 D32 D33 D34 D35 position 1
10 1 D36 D37 D38 D39 D40 D41 D42
11 1 D43 D44 D45 D46 D47 D48 D49
12 1 D50 D51 D52 D53 D54 D55 D56
13 1 D57 D58 D59 D60 D61 D62 D63
14 1 1 1 1 1 1 1 1
15 1 1 1 1 1 1 1 1
16 1 1 1 1 1 1 1 1
17 1 1 1 1 1 1 1 1
18 1 1 1 1 1 1 1 1
19 1 1 1 1 1 1 1 1
20 1 1 1 1 1 1 1 1
21 1 1 1 1 1 1 1 1
22 1 1 1 1 1 1 1 1
23 1 D'1 D'2 D'3 D'4 D'5 D'6 D'7
24 1 D'8 D'9 D'10 D'11 D'12 D'13 D'14
25 1 D'15 D'16 D'17 D'18 D'19 D'20 D'21
26 1 D'22 D'23 D'24 D'25 D'26 D'27 D'28 Data frame
27 1 D'29 D'30 D'31 D'32 D'33 D'34 D'35 position 3
28 1 D'36 D'37 D'38 D'39 D'40 D'41 D'42
29 1 D'43 D'44 D'45 D'46 D'47 D'48 D'49
30 1 D'50 D'51 D'52 D'53 D'54 D'55 D'56
31 1 D'57 D'58 D'59 D'60 D'61 D'62 D'63
32 1 1 1 1 1 1 1 1
33 1 1 1 1 1 1 1 1
34 1 1 1 1 1 1 1 1
35 1 1 1 1 1 1 1 1
36 1 1 1 1 1 1 1 1
37 1 1 1 1 1 1 1 1
38 1 1 1 1 1 1 1 1
39 1 1 1 1 1 1 1 1
40 1 1 1 1 1 1 1 1
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5.1.3 O&M frame
Bit number
Octet no. 1 2 3 4 5 6 7 8
1 0 0 0 0 0 0 0 0
2 0 0 0 0 0 0 0 0
3 1 C1 C2 C3 C4 C5 C6 C7
4 C8 C9 C10 C11 C12 C13 C14 C15
5 1 D1 D2 D3 D4 D5 D6 D7
6 D8 D9 D10 D11 D12 D13 D14 D15
7 1 D16 D17 D18 D19 D20 D21 D22
8 D23 D24 D25 D26 D27 D28 D29 D30
9 1 D31 D32 D33 D34 D35 D36 D37
10 D38 D39 D40 D41 D42 D43 D44 D45
11 1 D46 D47 D48 D49 D50 D51 D52
12 D53 D54 D55 D56 D57 D58 D59 D60
13 1 D61 D62 D63 D64 D65 D66 D67
14 D68 D69 D70 D71 D72 D73 D74 D75
15 1 D76 D77 D78 D79 D80 D81 D82
16 D83 D84 D85 D86 D87 D88 D89 D90
17 1 D91 D92 D93 D94 D95 D96 D97
18 D98 D99 D100 D101 D102 D103 D104 D105
19 1 D106 D107 D108 D109 D110 D111 D112
20 D113 D114 D115 D116 D117 D118 D119 D120
21 1 D121 D122 D123 D124 D125 D126 D127
22 D128 D129 D130 D131 D132 D133 D134 D135
23 1 D136 D137 D138 D139 D140 D141 D142
24 D143 D144 D145 D146 D147 D148 D149 D150
25 1 D151 D152 D153 D154 D155 D156 D157
26 D158 D159 D160 D161 D162 D163 D164 D165
27 1 D166 D167 D168 D169 D170 D171 D172
28 D173 D174 D175 D176 D177 D178 D179 D180
29 1 D181 D182 D183 D184 D185 D186 D187
30 D188 D189 D190 D191 D192 D193 D194 D195
31 1 D196 D197 D198 D199 D200 D201 D202
32 D203 D204 D205 D206 D207 D208 D209 D210
33 1 D211 D212 D213 D214 D215 D216 D217
34 D218 D219 D220 D221 D222 D223 D224 D225
35 1 D226 D227 D228 D229 D230 D231 D232
36 D233 D234 D235 D236 D237 D238 D239 D240
37 1 D241 D242 D243 D244 D245 D246 D247
38 D248 D249 D250 D251 D252 D253 D254 D255
39 1 D256 D257 D258 D259 D260 D261 D262
40 D263 D264 S1 S2 S3 S4 S5 S6

5.1.4 Coding
In the following clauses, the coding of the frames is described. Any spare or not used control bits should be coded
binary "1".
ETSI
3GPP TS 48.061 version 13.0.0 Release 13 13 ETSI TS 148 061 V13.0.0 (2016-01)
5.1.4.1 Coding of frames for speech services
5.1.4.1.1 Coding of frames for Half Rate speech Control bits (C-bits):

Description Uplink Downlink
Frame type C1 C2 C3 C4 C1 C2 C3 C4
(Bits C1 - C4) 0  0  0  1 1  1  1  0
Channel type
Bit C5 1: half rate 1: half rate
Time Alignment Binary number indicating the
Binary number indicating the timing
(Bits C6 - C11) required timing adjustment to be adjustment made.
in steps of 250/500 µs.
The following values apply for the coding
C6C7 .  . . C11
0 0 0 0 0 0  No change in frame timing
0 0 0 0 0 1  Delay frame 1 * 500 µs
0 0 0 0 1 0  Delay frame 2 * 500 µs
. . .       .
. . .       .
1 0 0 1 1 1  Delay frame 39 * 500 µs
1 0 1 0 0 0  Not used
. . . .
1 1 1 1 0 1  Not used
1 1 1 1 1 0  Delay frame 1 * 250 µs
1 1 1 1 1 1  Advance frame 250 µs
Uplink
Bad Frame Indicator (BFI) 0: BFI = 0
C12 (see 3GPP TS 46.041) 1: BFI = 1

Downlink
Uplink Frame Error (UFE) 0: UFE = 0: bad uplink framing
C12 (see clause 6.8.1.3) 1: UFE = 1: good uplink
framing
Silence Descriptor (SID) C13 C14: SID
C13-C14 SID1 SID0
(see 3GPP TS 46.041)  0  0: SID = 0
0  1: SID = 1
1  0: SID = 2
Time Alignment Flag (TAF) 0: TAF = 0 Spare
C15 1: TAF = 1
(see 3GPP TS 46.041)
Speech indicator (SP) Spare 0: SP = 0
C16 1: SP = 1
(see 3GPP TS 46.041)
DTX downlink indicator (DTXd) 0: Downlink DTX shall not Spare
C17 be applied
1: Downlink DTX shall be
applied
Bits C18 - C21 Spare Spare
UFI bit: Unreliable Frame Indication (see 3GPP TS 46.041).
This bit is set to binary "1" in the downlink direction.
Data Bits (D-bits)
Bits D1 . D112: Speech block transferred in the same order as output from the transcoder (see 3GPP TS 46.020).
Cyclic Redundancy Check bits (CRC-bits)
Bits CRC0 . CRC2: CRC of the bits D1 to D44.
The bits are coded according to a cyclic code using the generator polynomial:
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g(X) = X +X+1
The encoding of the cyclic code is performed in a systematic form, which means that, in GF(2), the polynomial:
46 45 3 2
D1*X + D2*X + . + D44*X + CRC2*X + CRC1*X + CRC0.
where CRC0, CRC1, CRC2 are the parity bits, when divided by g(X) yields a remainder equal to:
1 + X + X .
Time Alignment Bits
Bits T1 . T4: Bits positioned at the end of the downlink and uplink TRAU speech frames.
Downlink:
If the timing of the frame is to be advanced 250 µs, these 4 bits are not transferred in order to
reduce the frame length accordingly. When transferred, the bits are set to binary "1".
Uplink:
T1 and T2 are set to binary "1".
If the timing of the frame is to be advanced 125 µs, the bits T3 and T4 are not transferred in order
to reduce the frame length accordingly. When transferred, the bits are set to binary "1" (see
clause 6.6.1.1.2).
5.1.4.1.2 Coding of frames for Adaptive Multi-Rate speech
See 3GPP TS 48.060 for 16 kBit/s submultiplexing.
5.1.4.2 Coding of data frames
Any spare or not used control bits should be coded binary "1".
Control bits (C-bits):
Description Uplink Downlink
Frame type C1 C2 C3 C4 C1 C2 C3 C4
Bits C1-C4 0  1  0  0: Data 1  0  1  1: Data
Channel type
Bit C5 1: half rate 1: half rate
Intermediate RA bit rate
Bit C6 0: 8 kbit/s 0: 8 kbit/s
Bits C7 - C11 Spare Spare
Bit C12 Spare
Uplink Frame Error (UFE) 0: UFE = 0: bad uplink framing
C12 (see clause 6.8.1.3) 1: UFE = 1: good uplink framing
Bits C13-C15 Spare Spare
Idle data frame
An idle data frame is a data frame with all data bit positions set to binary "1" (i.e. all bits of the modified V.110 frames
are set to "1").
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5.1.4.3 Coding of O&M frames
Control bits (C-bits):
Description Uplink Downlink
Frame type C1 C2 C3 C4 C1 C2 C3 C4
Bits C1-C4 0  0  1  0: O&M 1  1  0  1: O&M
Channel type
Bit C5 1: half rate 1: half rate
Bits C6 - C11 Spare Spare
Bit C12 Spare
Uplink Frame Error (UFE) 0: UFE = 0: bad uplink framing
C12 (see clause 6.8.1.3) 1: UFE = 1: good uplink framing
Bits C13-C15 Spare Spare
Data Bits (D-bits)
Bits D1 . D264: Bits used for transfer of O&M information. The coding and use of these bits are left to the
manufacturer of the BSC/TRAU.
Spare Bits (S-bits)
Bits S1 . S6: Spare.
5.1.5 Order of Bit Transmission
See 3GPP TS 48.060.
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5.2 8 kbit/s submultiplexing
5.2.1 Frames for Speech Services
5.2.1.1 Frame for Half Rate Speech

Bit number
Octet no 1 2 3 4 5 6 7 8
1 0 0 0 0 0 0 0 0
2 1 C1 C2 C3 C4 C5 XC1 XC2
3 0 1 XC3 XC4 XC5 XC6 D1 D2
4 1 D3 D4 D5 D6 D7 D8 D9
5 1 D10 D11 D12 D13 D14 D15 D16
6 1 D17 D18 D19 D20 D21 D22 D23
7 1 D24 D25 D26 D27 D28 D29 D30
8 1 D31 D32 D33 D34 D35 D36 D37
9 1 D38 D39 D40 D41 D42 D43 D44
10 1 CRC2 CRC1 CRC0 D45 D46 D47 D48
11 1 D49 D50 D51 D52 D53 D54 D55
12 1 D56 D57 D58 D59 D60 D61 D62
13 1 D63 D64 D65 D66 D67 D68 D69
14 1 D70 D71 D72 D73 D74 D75 D76
15 1 D77 D78 D79 D80 D81 D82 D83
16 1 D84 D85 D86 D87 D88 D89 D90
17 1 D91 D92 D93 D94 D95 D96 D97
18 1 D98 D99 D100 D101 D102 D103 D104
19 1 D105 D106 D107 D108 D109 D110 D111
20 1 D112 C6 C7 C8 C9 T1 T2
5.2.1.2 Frames for Adaptive Multi-Rate Speech
5.2.1.2.1 Frame for Lower Codec Modes
This frame layout shall be used for No_Speech frames and speech frames for codec modes 4,75, 5,15 and 5,90 kBit/s.
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Bit number
Octet no 1 2 3 4 5 6 7 8
1 0 0 0 0 0 0 0 0
2 1 D1 D2 D3 D4 D5 D6 D7
3 1 C1 C2 C3 C4 C5 D8 D9
4 0 1
D10 D11 D12 D13 D14 D15
5 1
D16 D17 D18 D19 D20 D21 D22
6 1
D29
7 1    D36
8 1    D43
9 1    D50
10 1    D57
11 1    D64
12 1    D71
13 1    D78
14 1
D85
15 1
D92
16 1
D99
17 1    D106
18 1    D113
19 1    D120
20 1 D121 D122 D123 D124 D125 D126 T

5.2.1.2.2 Speech frame for Codec Mode 6,70 kBit/s
This frame layout shall be used for speech frames for codec mode 6,70 kBit/s. The synchronisation pattern is unique
and identifies this codec mode.

Bit number
1 2 3 4 5 6 7 8
Octet no
1 0 0 0 0 0 0 0 0
2 1 D1 D2 D3 D4 D5 D5 D7
3 1 C1 C2 C3 D8 D9 D10 D11
4 1 D12 D13 D14 D15 D16 D17 D18
5 1 D19 D D D D D D25
6 0 D26 D D D D D D32
7 1 D33 D D D D D D39
D40 D D D D D D D47
9 1
D48 D D D D D D54
D55 D D D D D D D62
11 1 D63 D D D D D D69
12 D70 D D D D D D D77
13 1 D78 D D D D D D84
14 D85 D D D D D D D92
15 1 D93 D D D D D D99
16 D100 D D D D D D D107
17 1 D108 D D D D D D114
D115 D D D D D D D122
19 1
D D D D D D D129
20 D137
D130 D D D D D D
5.2.1.2.3 Speech frame for Codec Mode 7,40 kBit/s
This frame layout shall be used for speech frames for codec mode 7,40 kBit/s. The synchronisation pattern is unique
and identifies this codec mode.
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Bit number
Octet no Octet no 1 2 3 4 5 6 7 8
1 1 0 0 1 D1 D2 D3 D4 D5
2 2 0 D6 D7 D8 D9 D10 D11 D12
3 3 1 C1 C2 C3 D13 D14 D15 D16
4 0
4 D17 D18 D19 D20 D21 D22 D23
5 D24 D D D D D D D31
6 D32 D D D D D D D39
7 7 D40 D D D D D D D47
8 8 D48 D D D D D D D55
9 9 D56 D D D D D D D63
10 10 D64 D D D D D D D71
11 11 D72 D D D D D D D79
12 12 D80 D D D D D D D87
13 13 D88 D D D D D D D95
14 D96 D D D D D D D103
15 D104 D D D D D D D111
16 D112 D D D D D D D119
17 17 D120 D D D D D D D127
18 18 D128 D D D D D D D135
19 19 D136 D D D D D D D143
20 20 D144 D145 D146 D147 D148 D149 D150 D151

5.2.1.2.4 Speech frame for Codec Mode 7,95 kBit/s
AMR Codec Mode 7,95 kBit/s is not supported in 8 kBit/s submultiplexing.
5.2.1.3 Frames for Speech Codec Configuration Exchange

Bit number
Octet no 1 2 3 4 5 6 7 8
1 0 0 0 0 0 0 0 0
2 1 C1 C2 C3 C4 C5 D1 D2
3 0 1 D3 D4 D5 D6 D7 D8
4 1    D15
5 1    D22
6 1    D29
7 1    D36
8 1    D43
9 1    D50
10 1    D57
11 1    D64
12 1    D71
13 1    D78
14 1    D85
15 1    D92
16 1    D99
17 1    D106
18 1    D113
19 1    D120
20 1 D121 D122 D123 D124 D125 T1 T2

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5.2.2 Data frame
Bit number
Octet no. 1 2 3 4 5 6 7 8
1 0 0 0 0 0 0 0 0
2 1 C1 C2 C3 C4 C5 D1 D2
3 0 1 D3 D4 D5 D6 D7 D8
4 1 D9 D10 D11 D12 D13 D14 D15
5 1 D16 D17 D18 D19 D20 D21 D22 Data frame
6 1 D23 D24 D25 D26 D27 D28 D29 position 1
7 1 D30 D31 D32 D33 D34 D35 D36
8 1 D37 D38 D39 D40 D41 D42 D43
9 1 D44 D45 D46 D47 D48 D49 D50
10 1 D51 D52 D53 D54 D55 D56 D57
11 1 D58 D59 D60 D61 D62 D63 D'1
12 1 D'2 D'3 D'4 D'5 D'6 D'7 D'8
13 1 D'9 D'10 D'11 D'12 D'13 D'14 D'15
14 1 D'16 D'17 D'18 D'19 D'20 D'21 D'22
15 1 D'23 D'24 D'25 D'26 D'27 D'28 D'29 Data frame
16 1 D'30 D'31 D'32 D'33 D'34 D'35 D'36 position 2
17 1 D'37 D'38 D'39 D'40 D'41 D'42 D'43
18 1 D'44 D'45 D'46 D'47 D'48 D'49 D'50
19 1 D'51 D'52 D'53 D'54 D'55 D'56 D'57
20 1 D'58 D'59 D'60 D'61 D'62 D'63 1

5.2.3 O&M frame
Bit number
Octet no. 1 2 3 4 5 6 7 8
1 0 0 0 0 0 0 0 0
2 1 C1 C2 C3 C4 C5 XC1 XC2
3 0 1 XC3 XC4 XC5 XC6 D1 D2
4 1 D3 D4 D5 D6 D7 D8 D9
5 1 D10 D11 D12 D13 D14 D15 D16
6 1 D17 D18 D19 D20 D21 D22 D23
7 1 D24 D25 D26 D27 D28 D29 D30
8 1 D31 D32 D33 D34 D35 D36 D37
9 1 D38 D39 D40 D41 D42 D43 D44
10 1 D45 D46 D47 D48 D49 D50 D51
11 1 D52 D53 D54 D55 D56 D57 D58
12 1 D59 D60 D61 D62 D63 D64 D65
13 1 D66 D67 D68 D69 D70 D71 D72
14 1 D73 D74 D75 D76 D77 D78 D79
15 1 D80 D81 D82 D83 D84 D85 D86
16 1 D87 D88 D89 D90 D91 D92 D93
17 1 D94 D95 D96 D97 D98 D99 D100
18 1 D101 D102 D103 D104 D105 D106 D107
19 1 D108 D109 D110 D111 D112 D113 D114
20 1 D115 D116 D117 D118 D119 D120 1

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5.2.4 Coding
5.2.4.1 Coding for Half Rate Speech and Half Rate Data Services
In the following clauses, the coding of the frames is described for all services, except for Adaptive Multi-Rate Speech
(AMR). Any spare or not used transmitted control bits should be coded binary "1".
5.2.4.1.1 Uplink coding
C
...