SIST ETS 300 609-2 E2:2003

SLOVENSKI STANDARD
SIST ETS 300 609-2 E2:2003
01-december-2003
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Digital cellular telecommunications system (Phase 2) (GSM); Base Station System (BSS)
equipment specification; Part 2: Signalling aspects (GSM 11.23 version 4.7.1)
Ta slovenski standard je istoveten z: ETS 300 609-2 Edition 2
ICS:
33.070.50 Globalni sistem za mobilno Global System for Mobile
telekomunikacijo (GSM) Communication (GSM)
SIST ETS 300 609-2 E2:2003 en
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

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SIST ETS 300 609-2 E2:2003

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SIST ETS 300 609-2 E2:2003
EUROPEAN ETS 300 609-2
TELECOMMUNICATION February 1998
STANDARD Second Edition
Source: SMG Reference: RE/SMG-081123PR1
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);
Base Station System (BSS) equipment specification;
Part 2: Signalling aspects
(GSM 11.23 version 4.7.1)
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: secretariat@etsi.fr
Tel.: +33 4 92 94 42 00 - Fax: +33 4 93 65 47 16
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 1998. All rights reserved.

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ETS 300 609-2 (GSM 11.23 version 4.7.1): February 1998
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 300 609-2 (GSM 11.23 version 4.7.1): February 1998
Contents
Foreword .11
1 Scope .13
2 Normative references.13
3 Abbreviations.15
4 Guide to this ETS .15
4.1 Layer 2 signalling .15
4.2 Layer 3 signalling .15
4.3 Core Specifications.15
5 Testing of Layer 2 (LAPDm) functions .16
5.1 Scope.16
5.2 Introduction .16
5.3 Layer 2 test frames .16
5.4 General requirements .17
5.5 Establishment of the dedicated physical resource.18
5.5.1 MS-originated .18
5.5.1.1 Contention resolution on FACCH or SDCCH .18
5.5.1.2 No Contention resolution on FACCH or SDCCH.19
5.5.1.3 No Contention resolution on FACCH (No immediate
Assign procedures).20
5.5.1.4 No contention resolution on SACCH (Short Message
Service).21
5.5.2 BSS-originated .21
5.5.2.1 Short Message Service.21
5.6 Release of the dedicated physical resource .22
5.6.1 MS-originated .22
5.6.2 BSS-originated .22
5.7 LAPDm idle state .22
5.8 Signalling connections (SAPI=0).24
5.8.1 Link establishment.24
5.8.1.1 Normal initialization (contention resolution).24
5.8.1.2 Initialization failure (contention resolution).25
5.8.1.2.1 Repeated SABM (loss of UA frame).25
5.8.1.2.2 SABMs with different information
fields.26
5.8.1.3 Normal initialization (no contention resolution).28
5.8.2 Normal information transfer.29
5.8.2.1 Sequence counting and I frame acknowledgements.29
5.8.2.2 Receipt of an I frame in the timer recovery state.32
5.8.2.3 Segmentation and Concatenation .34
5.8.2.4 Sequence of Segmented and non Segmented I frames .36
5.8.3 Normal Layer 2 release by MS.37
5.8.4 Normal Layer 2 release by BSS .38
5.8.5 Abnormal release .38
5.8.5.1 Abnormal data link release .38
5.8.5.2 Layer 2 release by MS while segmented I frames being
exchanged .39
5.8.5.3 Layer 2 release while BSS in the timer recovery state .40
5.8.6 Frame loss.41
5.8.6.1 I Frame loss (BSS to BSSTE) .41
5.8.6.2 RR Response frame loss (BSSTE to BSS) .41
5.8.6.3 RR response frame loss (BSS to BSSTE) .41
5.8.6.4 UA frame loss (BSS to MS).42

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ETS 300 609-2 (GSM 11.23 version 4.7.1): February 1998
5.8.7 Reception of REJ frames. 43
5.8.7.1 Data link layer not in the timer recovery state. 43
5.8.7.2 Data link layer in the timer recovery state, reception of a
REJ response frame . 45
5.8.7.3 Data link layer in the timer recovery state, reception of a
REJ command frame. 46
5.8.8 Frame transmission with incorrect C/R values . 47
5.8.8.1 I frame with C bit set to one . 47
5.8.8.2 SABM frame with C bit set to one . 48
5.8.9 Link failure . 50
5.8.10 Errors in the Control Field. 52
5.8.10.1 N(S) sequence error . 52
5.8.10.2 N(R) sequence error . 54
5.8.10.3 Improper F bit. 55
5.8.11 Receipt of invalid frames . 57
5.9 Short Message Services (SMS) (SAPI=3) . 62
5.9.1 MS-originated link establishment. 62
5.9.2 BSS-originated link establishment. 62
5.9.2.1 Normal initialization (no contention resolution) . 62
5.9.2.2 Initialization failure (no contention resolution) . 63
5.9.2.3 Initialization denial (no contention resolution) . 65
5.9.2.4 Total initialization failure (no contention resolution) . 66
5.9.3 Normal information transfer. 67
5.9.4 Normal layer 2 release by MS. 67
5.9.5 Normal Layer 2 release by BSS. 68
5.9.6 Abnormal release. 68
5.9.7 Frame loss. 70
5.9.8 Reception of REJ frames. 70
5.9.8.1 Data link layer not in the timer recovery state. 70
5.9.8.2 Data link layer in the timer recovery state, reception of a
REJ response frame . 71
5.9.8.3 Data link layer in the timer recovery state, reception of a
REJ command frame. 73
5.9.9 Frame transmission with incorrect C/R values . 74
5.9.9.1 I frame with C bit set to one . 74
5.9.9.2 SABM frame with C bit set to one . 75
5.9.10 Link failure . 77
5.9.11 Errors in the Control Field. 79
5.9.12 Receipt of invalid frames . 79
5.10 Simultaneous transactions on both SAPIs . 79
5.10.1 Normal information transfer. 79
5.10.1.1 Transmission and receipt of non segmented I frames on
both SAPIs . 79
5.10.2 Normal layer 2 release. 80
5.10.2.1 Normal release on SAPI 3 while segmented I frames
being exchanged simultaneously on both SAPIs. 80
5.10.2.2 Normal release on SAPI 0 while segmented I frames
being exchanged simultaneously on both SAPIs. 82
5.10.3 Abnormal Release . 83
5.10.3.1 Abnormal release on SAPI 3 while segmented I frames
being exchanged simultaneously on both SAPIs. 83
5.10.3.2 Abnormal release on SAPI 0 while segmented I frames
being exchanged simultaneously on both SAPIs. 85
5.10.4 Frame Loss. 86
5.10.4.1 I frame loss simultaneously on both SAPIs. 86
5.11 Layer 3 functions. 87
5.12 Short Message Service Cell Broadcast (SMSCB) . 88
6 Internal ABIS interfacing. 88
6.1 Layer 1 . 88
6.2 Signalling transport mechanism, layer 2 . 88
6.2.1 Base Station Controller. 88
6.2.1.1 Successful TEI allocation - fixed TEI . 89

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ETS 300 609-2 (GSM 11.23 version 4.7.1): February 1998
6.2.1.2 Denied TEI allocation - fixed TEI .90
6.2.1.3 Successful TEI allocation - additional TEI .91
6.2.1.4 Denied TEI allocation - additional TEI .93
6.2.2 Base Transceiver Station .94
6.2.2.1 Successful TEI allocation - fixed TEI.95
6.2.2.2 Denied TEI allocation - fixed TEI .96
6.2.2.3 Successful TEI allocation - additional TEI .97
6.2.2.4 Denied TEI allocation - additional TEI .99
6.3 LAYER 3 .101
7 Interfacing with the mobile services switching centre .102
7.1 Physical interface layer 1 .102
7.2 Signalling transport mechanism, layer 2.102
7.3 Layer 3 protocol .102
8 Base station system network aspects .103
8.1 Base station system network functions.103
8.1.1 General.103
8.1.2 Testing of the DTAP.104
8.1.2.1 Messages from MSC to MS.104
8.1.2.2 Messages from MS to MSC.105
8.1.3 Testing of the BSSMAP and RR functions.105
8.1.3.1 System information.107
8.1.3.1.1 Dedicated resource set up.107
8.1.3.1.2 No dedicated resource established .108
8.1.3.2 Service requests in SABM frames.109
8.1.3.2.1 Allowed messages.109
8.1.3.2.2 Not allowed messages.110
8.1.3.3 Random access by MS and immediate assignment .111
8.1.3.3.1 Normal Case - SDCCH.111
8.1.3.3.2 Normal Case - TCH .113
8.1.3.3.3 T3101 expiry case.115
8.1.3.3.4 No radio resources available .116
8.1.3.3.5 Immediate assignment extended.117
8.1.3.4 Paging.118
8.1.3.4.1 Normal case.118
8.1.3.4.2 Paging reorganization .119
8.1.3.4.3 Channel needed.120
8.1.3.5 Measurement reporting .121
8.1.3.6 Assignment.121
8.1.3.6.1 Normal case.121
8.1.3.6.2 T10 expiry .123
8.1.3.6.3 Terrestrial resources already allocated125
8.1.3.6.4 Reverse to old channel .126
8.1.3.7 External handover as seen from the old BSS.127
8.1.3.7.1 Normal case.127
8.1.3.7.2 T8 expiry .129
8.1.3.7.3 Reversion to old channel .130
8.1.3.8 External handover as seen from the new BSS.132
8.1.3.8.1 Non-synchronized network .132
8.1.3.8.1.1 Normal Case.132
8.1.3.8.1.2 No LAPDm connection .134
8.1.3.8.1.3 Wrong Handover Reference.136
8.1.3.8.1.4 Wrong physical channel.137
8.1.3.8.1.5 No radio resources available .138
8.1.3.8.1.6 Clear Command from the MSC .139
8.1.3.8.1.7 No terrestrial resource available .141
8.1.3.8.1.8 Handover - CLM2.142
8.1.3.8.1.9 Handover - CLM2 and CLM3.143
8.1.3.8.2 Synchronized network.144
8.1.3.9 Internal handover.144
8.1.3.9.1 Internal inter-cell handover .144
8.1.3.9.1.1 Normal case.144

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8.1.3.9.1.2 No LAPDm connection. 146
8.1.3.9.2 Internal intra-cell handover. 148
8.1.3.9.2.1 Intra-cell handover by the assignment
procedure . 148
8.1.3.9.2.1.1 Normal case. 148
8.1.3.9.2.1.2 T10 expiry. 150
8.1.3.9.2.1.3 Revert to old channel . 151
8.1.3.9.2.1.4 CLM2. 152
8.1.3.9.2.2 Intra-cell handover by the handover
procedure . 153
8.1.3.9.2.2.1 Normal case. 153
8.1.3.9.2.2.2 T8 expiry. 155
8.1.3.9.2.2.3 Reverse to old channel. 156
8.1.3.10 Frequency redefinition. 157
8.1.3.11 Transmission mode change. 158
8.1.3.12 Ciphering mode setting . 159
8.1.3.12.1 Cipher Mode Complete . 160
8.1.3.12.2 DTAP message. 161
8.1.3.12.3 IMEISV request without starting
encryption. 163
8.1.3.12.4 IMEISV request with invalid answer . 164
8.1.3.12.5 IMEISV not requested with invalid
answer. 165
8.1.3.13 Additional assignment. 166
8.1.3.14 Partial release . 167
8.1.3.15 Classmark. 167
8.1.3.15.1 Classmark change . 167
8.1.3.15.2 Classmark Interrogation. 168
8.1.3.16 Channel release. 169
8.1.3.16.1 Normal case. 169
8.1.3.16.2 T3109 expiry. 170
8.1.3.16.3 Radio resources out of service. 172
8.1.3.17 Radio link failure. 172
8.1.3.18 Blocking. 173
8.1.3.18.1 Single circuit blocking. 173
8.1.3.18.1.1 Normal Case . 173
8.1.3.18.1.2 Blocking a terrestrial circuit already
used on a call . 175
8.1.3.18.1.3 No response to the Unblocking
message. 176
8.1.3.18.1.4 Unblocking, Normal case . 178
8.1.3.18.1.5 MSC Reset during Blocking procedure179
8.1.3.18.2 Circuit group blocking. 180
8.1.3.18.2.1 Circuit group block - Normal case. 180
8.1.3.18.2.2 Circuit group unblock - Normal case. 181
8.1.3.19 Resource indication. 182
8.1.3.19.1 Spontaneous indication. 182
8.1.3.19.2 One single indication. 183
8.1.3.19.3 Periodic indication . 184
8.1.3.19.4 No indication. 185
8.1.3.19.5 Extended resource indicator . 187
8.1.3.20 Reset. 188
8.1.3.20.1 Global reset. 188
8.1.3.20.1.1 Global reset at the BSS. 188
8.1.3.20.1.2 Global reset at the MSC. 189
8.1.3.20.2 Reset circuit . 190
8.1.3.20.2.1 Reset circuit at the BSS . 190
8.1.3.20.2.2 Reset circuit at the MSC . 192
8.1.3.21 Handover candidate enquiry . 194
8.1.3.21.1 Handover candidate enquiry for 3 MSs194
8.1.3.21.2 Handover candidate enquiry for 1 MS 195
8.1.3.21.3 Repetition of the Handover candidate
enquiry message. 196

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8.1.3.22 Trace invocation .197
8.1.3.22.1 Trace invoked by the MSC.197
8.1.3.22.2 Trace invoked by the BSS .198
8.1.3.23 Flow control .198
8.1.3.23.1 Overload in the MSC.198
8.1.3.23.2 Overload in the BSS .199
8.1.3.24 Data link control for SAPI not equal to 0.199
8.1.3.24.1 MSC-originated transaction .199
8.1.3.24.1.1 Normal case.199
8.1.3.24.1.2 MS failure.200
8.1.3.24.1.3 SAPI 3 transactions rejected in the
OMC.201
8.1.3.24.2.1 Normal case.202
8.1.3.25 Queuing indication.203
8.1.3.25.1 Assignment case .204
8.1.3.25.2 Handover case.205
8.1.3.26 Short Message Service Cell Broadcast (SMSCB).207
8.1.3.27 Unequipped circuit.207
8.1.3.27.1 Normal case.207
8.1.3.27.2 Assignment request message .208
8.1.3.27.3 Handover request message.209
8.1.3.27.4 Blocking acknowledge message.210
8.1.3.27.5 Unblocking acknowledge message .211
8.1.3.27.6 Reset circuit message .212
8.1.3.27.7 Circuit group blocking acknowledge
message .212
8.1.3.27.8 Circuit group unblocking acknowledge
message .213
8.1.3.27.9 Unequipped circuit message .214
8.1.3.28 Confusion.215
8.1.3.28.1 Reserved element used.215
8.1.3.28.2 Zero length value .216
8.1.3.28.3 Inconsistent length value .217
9 Base station controller network aspects.219
9.1 Base station controller network functions .219
9.1.1 General.219
9.1.2 Transparent messages .220
9.1.3 Non-transparent messages.220
9.1.3.1 Link establishment indication.221
9.1.3.2 Link establishment request.224
9.1.3.3 Link release indication .225
9.1.3.4 Link release request .226
9.1.3.5 Transmission of transparent L3-message in
acknowledged mode.227
9.1.3.6 Reception of transparent L3-message in acknowledged
mode.228
9.1.3.7 Transmission of transparent L3-message in
unacknowledged mode.229
9.1.3.8 Reception of transparent L3-message in unacknowledged
mode.229
9.1.3.9 Link error indication .229
9.1.3.10 Channel activation .230
9.1.3.11 Channel mode modify.232
9.1.3.12 Handover detection.234
9.1.3.13 Encryption.235
9.1.3.13.1 Start of encryption.235
9.1.3.13.2 Stop of encryption.237
9.1.3.13.3 Failure case .238
9.1.3.14 Measurement reporting .239
9.1.3.14.1 Basic measurement reporting.239
9.1.3.14.2 Pre-processed measurement
reporting (optional).239

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9.1.3.14.3 Pre-processing configuration
(optional) . 240
9.1.3.15 Deactivate SACCH. 240
9.1.3.16 Radio channel release . 242
9.1.3.17 MS power control (optional) . 243
9.1.3.18 Transmission power control (optional). 244
9.1.3.19 Connection failure . 245
9.1.3.20 Physical context request (optional) . 246
9.1.3.21 SACCH Info modify. 247
9.1.3.22 Channel request by MS. 248
9.1.3.23 Paging. 248
9.1.3.24 Delete indication. 249
9.1.3.25 CCCH load indication. 249
9.1.3.26 Broadcast information modify . 249
9.1.3.27 Immediate assignment. 250
9.1.3.28 Short Message Service Cell Broadcast (SMSCB) . 251
9.1.3.29 Radio resource indication. 251
9.1.3.30 SACCH filling information modify. 253
9.1.3.31 Flow control. 253
9.1.3.32 Error reporting. 254
10 Base transceiver station network aspects . 255
10.1 Base transceiver station network aspects functions . 255
10.1.1 General .
...