SIST ETS 300 737 E1:2003

Digital cellular telecommunications system (Phase 2+) (GSM); In-band control of remote transcoders and rate adaptors for Enhanced Full Rate (EFR) and full rate traffic channels (GSM 08.60)

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 adaption shall be as specified in GSM 04.21 and GSM 08.20. In the case where 16 kbit/s traffic channels are used for full rate speech or Enhanced Full Rate speech or full rate data service, then this specification shall apply for frame structure and for control of remote transcoders and additional rate adaptors. The use and general aspects of the Abis interface are given in GSM 08.51. NOTE:   This specification should be considered together with the GSM 06 series of specifications,GSM 04.21 (Rate Adaption on the MS-BSS Interface) and GSM 08.20 (Rate Adaption on the BS/MSC Interface).

Digitalni celični telekomunikacijski sistem (faza 2+) – Znotrajpasovno krmiljenje oddaljenih prekodirnikov (transkoderjev) in prilagodilnikov hitrosti za prometne kanale izboljšanega govora s polno hitrostjo (EFR) (GSM 08.60)

General Information

• Status: Published
• Publication Date: 30-Nov-2003
• ICS: 33.070.50 - Global System for Mobile Communication (GSM)
• Technical Committee: SS EIT - Technical Board for the electrotechnical, information technology and telecommunications fields
• Current Stage: 6060 - National Implementation/Publication (Adopted Project)
• Start Date: 01-Dec-2003
• Due Date: 01-Dec-2003
• Completion Date: 01-Dec-2003
• Ref Project: ETSI ETS 300 737 ed.1 (1997-03) - Digital cellular telecommunications system (Phase 2+) (GSM); In-band control of remote transcoders and rate adaptors for Enhanced Full Rate (EFR) and full rate traffic channels (GSM 08.60)

Standards Content (Sample)

SLOVENSKI STANDARD
SIST ETS 300 737 E1:2003
01-december-2003
'LJLWDOQLFHOLþQLWHOHNRPXQLNDFLMVNLVLVWHPID]D±=QRWUDMSDVRYQRNUPLOMHQMH
RGGDOMHQLKSUHNRGLUQLNRYWUDQVNRGHUMHYLQSULODJRGLOQLNRYKLWURVWL]DSURPHWQH
NDQDOHL]EROMãDQHJDJRYRUDVSROQRKLWURVWMR()5*60
Digital cellular telecommunications system (Phase 2+) (GSM); In-band control of remote
transcoders and rate adaptors for Enhanced Full Rate (EFR) and full rate traffic channels
(GSM 08.60)
Ta slovenski standard je istoveten z: ETS 300 737 Edition 1
ICS:
33.070.50 Globalni sistem za mobilno Global System for Mobile
telekomunikacijo (GSM) Communication (GSM)
SIST ETS 300 737 E1:2003 en
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

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SIST ETS 300 737 E1:2003

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SIST ETS 300 737 E1:2003
EUROPEAN ETS 300 737
TELECOMMUNICATION March 1997
STANDARD
Source: ETSI TC-SMG Reference: DE/SMG-020860Q
ICS: 33.020
Key words: Digital cellular telecommunications system, Global System for Mobile communications (GSM)
R
GLOBAL SYSTEM FOR
MOBILE COMMUNICATIONS
Digital cellular telecommunications system (Phase 2+);
Inband control of remote transcoders and rate adaptors for
Enhanced Full Rate (EFR) and full rate traffic channels
(GSM 08.60)
ETSI
European Telecommunications Standards Institute
ETSI Secretariat
Postal address: F-06921 Sophia Antipolis CEDEX - FRANCE
Office address: 650 Route des Lucioles - Sophia Antipolis - Valbonne - FRANCE
X.400: c=fr, a=atlas, p=etsi, s=secretariat - Internet: [e-mail]
Tel.: [phone] - Fax: [phone]
Copyright Notification: No part may be reproduced except as authorized by written permission. The copyright and the
foregoing restriction extend to reproduction in all media.
© European Telecommunications Standards Institute 1997. All rights reserved.

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ETS 300 737 (GSM 08.60 version 5.0.3): March 1997
Whilst every care has been taken in the preparation and publication of this document, errors in content,
typographical or otherwise, may occur. If you have comments concerning its accuracy, please write to
"ETSI Editing and Committee Support Dept." at the address shown on the title page.

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ETS 300 737 (GSM 08.60 version 5.0.3): March 1997
Contents
Foreword .5
1 Scope .7
1.1 Normative references .7
1.2 Abbreviations .8
2 General Approach .9
3 Frame Structure .11
3.1 Speech Frames .11
3.2 O&M Frames .12
3.3 Data Frames .13
3.4 Idle Speech Frames.14
3.5 Coding.14
3.5.1 Coding of Speech Frames .15
3.5.2 Coding of O&M Frames. .17
3.5.3 Coding of Data Frames .17
3.5.4 Coding of Idle Speech Frames.18
3.6 Order of Bit Transmission.18
4 Procedures.18
4.1 Remote Control of Transcoders and Rate Adaptors. .18
4.2 Resource Allocation.19
4.3 Resource Release .19
4.4 In Call Modification.19
4.5 Transfer of Idle Frames .19
4.5.1 In Full rate data case.19
4.5.2 In Full rate speech case .19
4.5.3 In Enhanced Full rate speech case.20
4.6 Procedures for Speech Frames.20
4.6.1 Time Alignment of Speech Frames.20
4.6.1.1 Initial Time Alignment State.20
4.6.1.2 The Static Time Alignment State.21
4.6.1.3 Initiation at Resource Allocation .23
4.6.1.4 Time Alignment During Hand over .23
4.6.1.4.1 BSS External Hand over.23
4.6.1.4.2 BSS Internal Hand over .23
4.6.2 Procedures for Discontinuous Transmission (DTX).23
4.6.2.1 DTX procedures in the uplink direction.23
4.6.2.2 DTX procedures in the downlink direction.24
4.7 Procedures for Data Frames .24
4.7.1 The RAA Function.25
4.7.2 The RA1/RA1' Function.26
4.7.3 The RA2 Function .26
4.7.4 Procedures for 8 kbit/s intermediate rate adaption rate .26
4.7.5 Procedures for 16 kbit/s intermediate rate adaption rate .26
4.7.6 Support of Non-Transparent Bearer Applications .26
4.8 Frame Synchronization .26
4.8.1 Search for Frame Synchronization.26
4.8.2 Frame Synchronization After Performing Downlink Timing Adjustments.26
4.8.3 Frame Synchronization Monitoring and Recovery.27
4.9 Correction/detection of bit errors on the terrestrial circuits .27
4.9.1 Error Detection on the Control Bits.27
4.9.1.1 General Procedure .27
4.9.1.2 Speech Frames .28
4.9.2 Handling of frames received with errors.28
4.9.2.1 In case of Full Rate.28

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ETS 300 737 (GSM 08.60 version 5.0.3): March 1997
4.9.2.2 In case of Enhanced Full rate . 28
4.10 Procedures for Operation & Maintenance. 28
4.10.1 Transfer of O&M Information Between the TRAU and the BSC. 29
4.10.2 Procedures in the TRAU. 29
4.10.3 Procedures in the BSC . 29
4.10.3.1 Use of O&M Frames . 29
4.10.4 Procedures in the BTS. 30
History. 31

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ETS 300 737 (GSM 08.60 version 5.0.3): March 1997
Foreword
This European Telecommunication Standard (ETS) has been produced by the Special Mobile Group
(SMG) Technical Committee of the European Telecommunications Standards Institute (ETSI).
This ETS specifies the inband control of remote transcoders and rate adaptors for full rate speech,
Enhanced Full rate speech and full rate data within the digital cellular telecommunications system
(Phase 2+).
This ETS corresponds to GSM technical specification, GSM 08.60 version 5.0.3.
The specification from which this ETS has been derived was originally based on CEPT documentation,
hence the presentation of this ETS may not be entirely in accordance with the ETSI/PNE Rules.
Transposition dates
Date of adoption: 28 February 1997
Date of latest announcement of this ETS (doa): 30 June 1997
Date of latest publication of new National Standard
or endorsement of this ETS (dop/e): 31 December 1997
Date of withdrawal of any conflicting National Standard (dow): 31 December 1997

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Blank page

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ETS 300 737 (GSM 08.60 version 5.0.3): March 1997
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 GSM 04.21 and
GSM 08.20.
In the case where 16 kbit/s traffic channels are used for full rate speech or enhanced full rate speech or
full rate data service, then this specification shall apply for frame structure and for control of remote
transcoders and additional rate adaptors.
The use and general aspects of the Abis interface are given in GSM 08.51.
NOTE: This ETS should be considered together with the GSM 06 series of specifications,
GSM 04.21 (Rate Adaptation on the MS-BSS Interface) and GSM 08.20 (Rate
Adaptation on the BS/MSC Interface).
1.1 Normative references
This ETS incorporates by dated and undated reference, provisions from other publications. These
normative references are cited at the appropriate places in the text and the publications are listed
hereafter. For dated references, subsequent amendments to or revisions of any of these publications
apply to this ETS only when incorporated in it by amendment or revision. For undated references, the
latest edition of the publication referred to applies.
[1] GSM 01.04 (ETR 100): "Digital cellular telecommunications system (Phase 2);
Abbreviations and acronyms".
[2] GSM 04.06 (ETS 300 555): "Digital cellular telecommunications system
(Phase 2); Mobile Station - Base Station System (MS - BSS) interface Data Link
(DL) layer specification".
[3] GSM 04.21 (ETS 300 562): "Digital cellular telecommunications system
(Phase 2); Rate adaption on the Mobile Station - Base Station System (MS -
BSS) interface".
[4] GSM 06.01 (ETS 300 580-1): "Digital cellular telecommunications system
(Phase 2); Full rate speech processing functions".
[5] GSM 06.10 (ETS 300 580-2): "Digital cellular telecommunications system
(Phase 2); Full rate speech transcoding".
[6] GSM 06.11 (ETS 300 580-3): "Digital cellular telecommunications system
(Phase 2); Substitution and muting of lost frames for full rate speech channels".
[7] GSM 06.12 (ETS 300 580-4): "Digital cellular telecommunications system
(Phase 2); Comfort noise aspect for full rate speech traffic channels".
[8] GSM 06.31 (ETS 300 580-5): "Digital cellular telecommunications system
(Phase 2); Discontinuous Transmission (DTX) for full rate speech traffic
channel".
[9] GSM 06.32 (ETS 300 580-6): "Digital cellular telecommunications system
(Phase 2); Voice Activity Detection (VAD)".
[10] GSM 08.20 (ETS 300 591): "Digital cellular telecommunications system
(Phase 2); Rate adaption on the Base Station System - Mobile-services
Switching Centre (BSS - MSC) interface".
[11] GSM 08.51 (ETS 300 592): "Digital cellular telecommunications system
(Phase 2); Base Station Controller - Base Transceiver Station (BSC - BTS)
interface General aspects".

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ETS 300 737 (GSM 08.60 version 5.0.3): March 1997
[12] GSM 08.54 (ETS 300 594): "Digital cellular telecommunications system
(Phase 2); Base Station Controller - Base Transceiver Station (BSC - BTS)
interface Layer 1 structure of physical circuits".
[13] GSM 08.58 (ETS 300 596): "Digital cellular telecommunications system
(Phase 2); Base Station Controller - Base Transceiver Station (BSC - BTS)
interface Layer 3 specification".
[14] GSM 12.21 (ETS 300 623): "Digital cellular telecommunications system
(Phase 2); 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 (ISDN)".
[18] GSM 06.51 (ETS 300 723): "Digital cellular telecommunications system;
Enhanced Full rate speech processing functions".
[19] GSM 06.60 (ETS 300 726): "Digital cellular telecommunications system;
Enhanced Full rate speech transcoding".
[20] GSM 06.61 (ETS 300 727): "Digital cellular telecommunications system;
Substitution and muting of lost frames for Enhanced Full rate speech channels".
[21] GSM 06.62 (ETS 300 728): "Digital cellular telecommunications system;
Comfort noise aspect for Enhanced Full rate speech traffic channels".
[22] GSM 06.81 (ETS 300 729): "Digital cellular telecommunications system;
Discontinuous Transmission (DTX) for Enhanced Full rate speech traffic
channel".
[23] GSM 06.82 (ETS 300 730): "Digital cellular telecommunications system; Voice
Activity Detection (VAD)".
1.2 Abbreviations
Abbreviations used in this ETS are listed in GSM 01.04

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ETS 300 737 (GSM 08.60 version 5.0.3): March 1997
2 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 this specification, 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.
When data is adapted to the 320 bit frames, a conversion function is required in addition to the
conversion/rate adaption specified in GSM 08.20. This function constitute the RAA.
The TRAU is considered a part of the BSC, and the signalling between the BSC and the TRAU (e.g.
detection of call release, hand over 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 this
specification, 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 2.1, 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;
- 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.
This specification will not describe the procedures inside the TRAU and the CCU. The layout in figure 2.1
is only intended as a reference model.

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ETS 300 737 (GSM 08.60 version 5.0.3): March 1997
BSC                                  BTS
CCU (CHANNEL CODEC UNIT)
TRAU (TRANSCODER/RA UNIT)
Trans-
Remote
Speech
coder
Speech
Handler
Function
Handler
Function
(Note)
Function
Speech
Speech
Abis
T rans-
Remote
C hannel
coder and
Transcoder
C odec
RA Control
and R A
Function
Fun ction
Contr. Fn.
16 Kbit/s
Radio
64 kbit/s
320 bit/
frames
 20 m S
L3 C ontrol
Data
signals
RA2 RAA RA1 RA1´
RAA
Data
Speech/data
Control
NOTE: This recommendation assumes the DTX handler function to be a part of the Transcoder Function.
Figure GSM 08.60/2.1: Functional entities for handling of remote control of remote transcoders
and rate adaptors

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ETS 300 737 (GSM 08.60 version 5.0.3): March 1997
3 Frame Structure
3.1 Speech Frames
Bit number
Octet no. 1 2 3 4 5 6 7 8
0 0 00 00 00 0
1 0 00 00 00 0
2 1 C1 C2 C3 C4 C5 C6 C7
3 C8 C9 C10 C11 C12 C13 C14 C15
4 1 D1 D2 D3 D4 D5 D6 D7
5 D8 D9 D10 D11 D12 D13 D14 D15
6 1 D16 D17 D18 D19 D20 D21 D22
7 D23 D24 D25 D26 D27 D28 D29 D30
8 1 D31 D32 D33 D34 D35 D36 D37
9 D38 D39 D40 D41 D42 D43 D44 D45
10 1 D46 D47 D48 D49 D50 D51 D52
11 D53 D54 D55 D56 D57 D58 D59 D60
12 1 D61 D62 D63 D64 D65 D66 D67
13 D68 D69 D70 D71 D72 D73 D74 D75
14 1 D76 D77 D78 D79 D80 D81 D82
15 D83 D84 D85 D86 D87 D88 D89 D90
16 1 D91 D92 D93 D94 D95 D96 D97
17 D98 D99 D100 D101 D102 D103 D104 D105
18 1 D106 D107 D108 D109 D110 D111 D112
19 D113 D114 D115 D116 D117 D118 D119 D120
20 1 D121 D122 D123 D124 D125 D126 D127
21 D128 D129 D130 D131 D132 D133 D134 D135
22 1 D136 D137 D138 D139 D140 D141 D142
23 D143 D144 D145 D146 D147 D148 D149 D150
24 1 D151 D152 D153 D154 D155 D156 D157
25 D158 D159 D160 D161 D162 D163 D164 D165
26 1 D166 D167 D168 D169 D170 D171 D172
27 D173 D174 D175 D176 D177 D178 D179 D180
28 1 D181 D182 D183 D184 D185 D186 D187
29 D188 D189 D190 D191 D192 D193 D194 D195
30 1 D196 D197 D198 D199 D200 D201 D202
31 D203 D204 D205 D206 D207 D208 D209 D210
32 1 D211 D212 D213 D214 D215 D216 D217
33 D218 D219 D220 D221 D222 D223 D224 D225
34 1 D226 D227 D228 D229 D230 D231 D232
35 D233 D234 D235 D236 D237 D238 D239 D240
36 1 D241 D242 D243 D244 D245 D246 D247
37 D248 D249 D250 D251 D252 D253 D254 D255
38 1 D256 D257 D258 D259 D260 C16 C17
39 C18 C19 C20 C21 T1 T2 T3 T4

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ETS 300 737 (GSM 08.60 version 5.0.3): March 1997
3.2 O&M Frames
Bit number
Octet no. 1 2 3 4 5 6 7 8
0 0 00 00 0 0 0
1 0 00 00 0 0 0
2 1 C1 C2 C3 C4 C5 C6 C7
3 C8 C9 C10 C11 C12 C13 C14 C15
4 1 D1 D2 D3 D4 D5 D6 D7
5 D8 D9 D10 D11 D12 D13 D14 D15
6 1 D16 D17 D18 D19 D20 D21 D22
7 D23 D24 D25 D26 D27 D28 D29 D30
8 1 D31 D32 D33 D34 D35 D36 D37
9 D38 D39 D40 D41 D42 D43 D44 D45
10 1 D46 D47 D48 D49 D50 D51 D52
11 D53 D54 D55 D56 D57 D58 D59 D60
12 1 D61 D62 D63 D64 D65 D66 D67
13 D68 D69 D70 D71 D72 D73 D74 D75
14 1 D76 D77 D78 D79 D80 D81 D82
15 D83 D84 D85 D86 D87 D88 D89 D90
16 1 D91 D92 D93 D94 D95 D96 D97
17 D98 D99 D100 D101 D102 D103 D104 D105
18 1 D106 D107 D108 D109 D110 D111 D112
19 D113 D114 D115 D116 D117 D118 D119 D120
20 1 D121 D122 D123 D124 D125 D126 D127
21 D128 D129 D130 D131 D132 D133 D134 D135
22 1 D136 D137 D138 D139 D140 D141 D142
23 D143 D144 D145 D146 D147 D148 D149 D150
24 1 D151 D152 D153 D154 D155 D156 D157
25 D158 D159 D160 D161 D162 D163 D164 D165
26 1 D166 D167 D168 D169 D170 D171 D172
27 D173 D174 D175 D176 D177 D178 D179 D180
28 1 D181 D182 D183 D184 D185 D186 D187
29 D188 D189 D190 D191 D192 D193 D194 D195
30 1 D196 D197 D198 D199 D200 D201 D202
31 D203 D204 D205 D206 D207 D208 D209 D210
32 1 D211 D212 D213 D214 D215 D216 D217
33 D218 D219 D220 D221 D222 D223 D224 D225
34 1 D226 D227 D228 D229 D230 D231 D232
35 D233 D234 D235 D236 D237 D238 D239 D240
36 1 D241 D242 D243 D244 D245 D246 D247
37 D248 D249 D250 D251 D252 D253 D254 D255
38 1 D256 D257 D258 D259 D260 D261 D262
39 D263 D264 S1 S2 S3 S4 S5 S6

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ETS 300 737 (GSM 08.60 version 5.0.3): March 1997
3.3 Data Frames
Bit number
Octet no. 1 2 3 4 5 6 7 8
0 0 000 000 0
1 0 000 000 0
2 1 C1 C2 C3 C4 C5 C6 C7
3 C8 C9 C10 C11 C12 C13 C14 C15
41 .
51 .
61 .
7 1 Data frame position 1
8 1 63 bits.
9 1 (72 bits including bit position 1)
10 1
11 1
12 1
13 1
14 1
15 1
161 1 Data frame position 2
17 1
18 1
19 1
20 1
21 1
22 1
23 1
24 1
25 1 Data frame position 3
26 1
27 1
28 1
29 1
30 1
31 1
32 1
33 1 Data frame position 4
34 1
35 1
36 1
37 1
38 1
39 1

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ETS 300 737 (GSM 08.60 version 5.0.3): March 1997
3.4 Idle Speech Frames
Bit number
Octet no. 1 2 3 4 5 6 7 8
0 0 000 000 0
1 0 000 000 0
2 1 C1 C2 C3 C4 C5 C6 C7
3 C8 C9 C10 C11 C12 C13 C14 C15
4 1 111 111 1
5 1 111 111 1
6 1 111 111 1
7 1 111 111 1
8 1 111 111 1
9 1 111 111 1
10 1 111 111 1
11 1 111 111 1
12 1 111 111 1
13 1 111 111 1
14 1 111 111 1
15 1 111 111 1
16 1 111 111 1
17 1 111 111 1
18 1 111 111 1
19 1 111 111 1
20 1 111 111 1
21 1 111 111 1
22 1 111 111 1
23 1 111 111 1
24 1 111 111 1
25 1 111 111 1
26 1 111 111 1
27 1 111 111 1
28 1 111 11 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 C16 C17
39 C18 C19 C20 C21 T1 T2 T3 T4
3.5 Coding
In the following clauses, the coding of the frames is described. Any spare or not used control bits should
be coded binary "1".
For all frame types the octet 0, 1 and the first bit of octets 2, 4, 6, 8, . 38 are used as frame sync.

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3.5.1 Coding of Speech Frames
Control bits (C-bits):
Description Uplink Downlink
C1C2C3C4 C5 C1C2C3C4C5
Frame type FR. Speech: 00010 Speech: 1 1 1 0 0
(Bits C1 - C5) EFR. Speech: 11010 Speech: 1 1 0 1 0
Time Binary number indicating the Binary number indicating the
Alignment required timing adjustment to be timing adjustment made.
(Bits C6 - C11)
made in steps of 250/500 Hs.
The following value apply for the coding
C6C7.C11
000000 No change in frame timing
000001 Delay frame 1 x 500 Hs
000010 Delay frame 2 x 500 Hs
. . . .
. . . .
100111 Delay frame 39 x 500 Hs
101000 Not used
. . . .
111101 Not used
111110 Delay frame 1 x 250 Hs
111111 Advance frame 250 Hs
Frame indicators. The C12: BFI C12 - C15: Spare
definition and coding 0: BFI = 0
of these indicators 1: BFI = 1 IF FR. Speech
are given in TS GSM 06.31. C13  C14: SID ELSE
Bits C12 - C16 0    0: SID = 0 C12: UFE
 0    1: SID = 1 0: UFE=0 bad uplink
 Downlink 1    0: SID = 2    frame
    1: UFE=1 good
 Uplink Frame Error C15: TAF uplink frame
 (UFE) C12 0: TAF = 0
 (see subclause 4.8.3) 1: TAF = 1    C13 - C15: spare
C16: Spare C16: SP
 0: SP = 0
 1: SP = 1
DTX indicator C17: DTXd C17: Spare
 0: DTX not applied
 1: DTX applied
Bits C18 - C21 Spare Spare

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Data Bits (D-bits):
Bits D1 . D260: Speech block transferred in the same order as output from the transcoder (see
GSM 06.10).
For Enhanced Full Rate Speech:
The speech block is subdivided in five subsets. The order within a given subset is the same as output
from the transcoder (see ETS 300 726, GSM 06.60). Three parity bits are added at the end of each
sub-set.
These parity bits are added to the bits of the subset, according to a degenerate (shortened) cyclic code
using the generator polynomial:

3
g(D) = D + D + 1
The encoding of the cyclic code is performed in a systematic form which means that, in GF(2), the
polynomial:
n -
n 1 3 2
d(m)D + d(m+1)D + .+ d(m + n-3)D + p(0)D + p(1)D + p(2)
where p(0), p(1), p(2) are the parity bits, when divided by g(D), yields a remainder equal to:
2
1 + D + D
For every CRC, the transmission order is p(0) first followed by p(1) and p(2) successively.
Bit D1 : spare (binary "1").
Bits D2.D39 : Indexes of the LSF submatrices.
Bits D40.D42 : CRC over bits D1 to D22, D25 to D27 and D29.
Bits D43.D95 : Indexes of the parameters of first sub-frame.
Bits D96.D98 : CRC over bits D43 to D52, D91 and D92.
Bits D99.D148 : Indexes of the parameters of second sub-frame.
Bits D149.D151 : CRC over bits D99 to D103, D105, D144 and D145.
Bits D152.D204 : Indexes of the parameters of third sub-frame.
Bits D205.D207 : CRC over bits D152 to D161, D200 and D201.
Bits D208.D257 : Indexes of the parameters of fourth sub-frame.
Bits D258.D260 : CRC over bits D208 to D212, D214, D253 and D254.
Time Alignment Bits:
Bits T1 . T4: Bits positioned at the end of the downlink frames. 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".

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3.5.2 Coding of O&M Frames.
Control bits (C-bits):
Description Uplink Downlink
C1C2C3C4C5 C1C2C3C4C5
Frame type 00101: O&M 11011: O&M
Bits C1 - C5
Bits C6 - 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:
Bits S1 . S6: Spare
3.5.3 Coding of Data Frames
Control bits (C-bits):
Description Uplink Downlink
C1C2C3C4C5 C1 C2 C3C4 C5
Frame type 00101: Data 10110: Data
Bits C1 - C5
Intermediate RA bit rate. 0: 8  kbit/s 0: 8  kbit/s
Bit C6 1: 16 kbit/s 1: 16 kbit/s
Bits C7 - C15 Spare Spare

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3.5.4 Coding of Idle Speech Frames.
Control bits (C-bits):
Description Uplink Downlink
C1C2C3C4C5 C1C2C3C4C5
Frame type. 10000: Idle Speech 01110: Idle Speech
Bits C1 - C5
Bits C6 - C21 Coding as for Speech frames. Coding as for Speech frames.
Time Alignment Bits:
Bits T1 . T4: Coding as for Speech frames.
3.6 Order of Bit Transmission.
The order of bit transmission is:
The first octet is transferred first with the bit no. 1 first, bit no. 2 next etc.
4 Procedures
4.1 Remote Control of Transcoders and Rate Adaptors.
When the transcoder is positioned remote to the BTS, the Channel Codec Unit (CCU) in the BTS has to
control some of the functions in the remote Transcoder/Rate Adaptor Unit (TRAU) in the BSC.
This remote control is performed by inband signalling carried by the control bits (C-bits) in each TRAU
frame.
The following functions in the TRAU are remotely controlled by the CCU:
- Shift between speech and data.
- Control of the rate adaption functions for data calls.
- Downlink frame timing for speech frames.
- Transfer of DTX information.
In addition, the inband signalling also provides means for transfer of O&M signals between the TRAU and
the BSC/BTS.

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4.2 Resource Allocation
At reception of the ASSIGNMENT REQUEST message, e.g. at call setup, when a circuit switched
connection is required, the BSC provides an appropriate TRAU to the circuit to be used between the BSC
and the BTS and sends the CHANNEL ACTIVATION message to the BTS.
When receiving the CHANnel ACTIVation message, the BTS allocates the appropriate radio resources
and a Channel Codec Unit (CCU) to be used.
The CCU now starts sending uplink frames with the appropriate "Frame Type" and, for data calls, the
intermediate rate adaption bit rate set.
When receiving the first frame, the TRAU sets the mode of operation accordingly and starts sen
...