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f Important Notice on Product SafetyDANGER - RISK OF ELECTRICAL SHOCK OR DEATH - FOLLOW ALL INSTALLATION INSTRUCTIONS.

The system complies with the standard EN 60950 / IEC 60950. All equipment connected to the system must

comply with the applicable safety standards.

Hazardous voltages are present at the AC power supply lines in this electrical equipment. Some components may

also have high operating temperatures.

Failure to observe and follow all installation and safety instructions can result in serious personal injury

or property damage.

Therefore, only trained and qualified personnel may install and maintain the system.

The same text in German:

Wichtiger Hinweis zur Produktsicherheit

LEBENSGEFAHR - BEACHTEN SIE ALLE INSTALLATIONSHINWEISE.

Das System entspricht den Anforderungen der EN 60950 / IEC 60950. Alle an das System angeschlossenen

Geräte müssen die zutreffenden Sicherheitsbestimmungen erfüllen.

In diesen Anlagen stehen die Netzversorgungsleitungen unter gefährlicher Spannung. Einige Komponenten

können auch eine hohe Betriebstemperatur aufweisen.

Nichtbeachtung der Installations- und Sicherheitshinweise kann zu schweren Körperverletzungen oder

Sachschäden führen.

Deshalb darf nur geschultes und qualifiziertes Personal das System installieren und warten.

Caution:

This equipment has been tested and found to comply with EN 301489. Its class of conformity is defined in tableA30808-X3247-X910-*-7618, which is shipped with each product. This class also corresponds to the limits for a

Class A digital device, pursuant to part 15 of the FCC Rules.

These limits are designed to provide reasonable protection against harmful interference when the equipment is

operated in a commercial environment.

This equipment generates, uses and can radiate radio frequency energy and, if not installed and used in accor-

dance with the relevant standards referenced in the manual “Guide to Documentation”, may cause harmful inter-

ference to radio communications.

For system installations it is strictly required to choose all installation sites according to national and local require-

ments concerning construction rules and static load capacities of buildings and roofs.

For all sites, in particular in residential areas it is mandatory to observe all respectively applicable electromagnetic

field / force (EMF) limits. Otherwise harmful personal interference is possible.

Trademarks:

All designations used in this document can be trademarks, the use of which by third parties for their own purposes

could violate the rights of their owners.

Copyright (C) Siemens AG 2002.

Issued by the Information and Communication Mobile Group

Hofmannstraße 51

D-81359 München

Technical modifications possible.

Technical specifications and features are binding only insofar asthey are specifically and expressly agreed upon in a written contract.


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Reason for Update

Summary:

Fourth edition for release BR 6.0

Details:

Chapter / Section Reason for Update

1.4 Minor error corrections

1.2.2.1 / 1.2.2.4 / 1.2.4.2 /

1.2.4.11 / 1.2.7.1 / 1.2.9.1

Minor error corrections

1.2.16.4 Paging Overload -

BTS discards a PAGING REQUEST message

1.2.5.2 / 1.2.8.2 / 1.2.16.4 Minor error corrections

Issue History

Issue Date of Issue Reason for Update

1 06/2002 First edition for new release BR 6.0

2 07/2002 Second edition for release BR 6.0

3 09/2002 Third edition for release BR 6.0

4 11/2002 Fourth edition for release BR 6.0


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This document consists of a total of 218 pages. All pages are issue 4.

Contents

1 Performance Measurement Message Flows . . . . . . . . . . . . . . . . . . . . . . . 111.1 Introduction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11

1.2 Message Flows . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12

1.2.1 Call Setup Procedures . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12

1.2.1.1 Successful Mobile Originating Cell (MOC), FR Call . . . . . . . . . . . . . . . . . . 12

1.2.1.2 Successful Mobile Terminating Call (MTC), FR Call. . . . . . . . . . . . . . . . . . 15

1.2.1.3 Successful Mobile Originating Cell (MOC) with DirectTraffic Channel Assignment, FR Call . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18

1.2.1.4 Successful Mobile Originating Call (MOC) Using EarlyClassmark Sending, FR Call . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20

1.2.1.5 Successful Mobile Terminating Call (MTC), using Early Classmark, Sending,

FR Call . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 231.2.1.6 Unsuccessful Mobile Originating Call (MOC), Subscriber B Busy,

FR Call . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 26

1.2.1.7 Unsuccessful Mobile Originating Call (MOC), No TCH Available,FR Call . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 27

1.2.1.8 Successful Mobile Originated Call (MOC) in a Concentric Cell(inner area), FR Call . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 29

1.2.1.9 Successful Mobile Emergency Call (MEC), FR Call . . . . . . . . . . . . . . . . . . 31

1.2.2 Unsuccessful Assignment Procedures . . . . . . . . . . . . . . . . . . . . . . . . . . . . 32

1.2.2.1 Unsuccessful TCH Assignment Procedure with Reversion toSDCCH, FR Call . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 32

1.2.2.2 Unsuccessful TCH Assignment Procedure with Loss ofASSIGNMENT COMMAND (T10 < T_MSRFPCI), FR Call(T10 Expiry) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 33

1.2.2.3 Unsuccessful TCH Assignment Procedure with Loss ofASSIGNMENT COMMAND (T10 > T_MSRFPCI), FR Call(T_MSRFPCI Expiry) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 34

1.2.2.4 Unsuccessful TCH Assignment Procedure LAPDm I-Frame withASSIGNMENT COMMAND not acknowledged by MS (T200 Expiry), FR Call35

1.2.3 Call Release Procedures . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 36

1.2.3.1 Normal Call Release (Originated by MS), FR Call . . . . . . . . . . . . . . . . . . . 36

1.2.3.2 Normal Call Release (Originated by Network), FR Call . . . . . . . . . . . . . . . 37

1.2.3.3 Abnormal Call Release ProcedureCall drop: BTS sends CONNECTION FAILURE INDICATIONto the BSC. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 38

1.2.3.4 Abnormal Call Release ProcedureCall drop: BTS sends ERROR INDICATION to the BSC . . . . . . . . . . . . . . 40

1.2.4 Inter-Cell Handover, Intra-BSC . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 42

1.2.4.1 Successful Inter-Cell Handover, Intra-BSC, FR Call. . . . . . . . . . . . . . . . . . 42

1.2.4.2 Unsuccessful Inter-Cell Handover Attempt, Intra-BSC,No TCH Available in Target Cell, FR Call . . . . . . . . . . . . . . . . . . . . . . . . . . 44

1.2.4.3 Unsuccessful Inter-Cell Handover, Intra-BSC, with Reversionto Old TCH (T3124 Expiry), FR Call . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 45

1.2.4.4 Unsuccessful Inter-Cell Handover, Intra-BSC, with Loss of MS(Loss of HO CMD, T8


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1.2.4.5 Unsuccessful Inter-Cell Handover, Intra-BSC with Loss of MS(Loss of HO CMD, T8>TTRAU), FR Call (TTRAU Expiry) . . . . . . . . . . . . . . 49

1.2.4.6 Unsuccessful Inter-Cell Handover, Intra-BSC, with Loss of MS,Handover Access Failure (No SABM after Transmission ofPHYSICAL INFO, [(NY1+1) * T3105]


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1.2.7.1 Successful Directed Retry, Intra-BSC, FR Call. . . . . . . . . . . . . . . . . . . . . . 96

1.2.7.2 Unsuccessful Directed Retry, Intra-BSC, No Target Cell Available, FR Call98

1.2.7.3 Unsuccessful Directed Retry, Intra-BSC, 1 Target Cell Available,Target Cell Congested, FR Call . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 99

1.2.7.4 Unsuccessful Directed Retry, Intra-BSC, with Reversion toSDCCH, FR Call (T3124 Expiry). . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 100

1.2.7.5 Unsuccessful Directed Retry, Intra-BSC, with Loss of MS(Loss of HO CMD, T8 < TTRAU), FR Call (T8 Expiry) . . . . . . . . . . . . . . . 102

1.2.7.6 Unsuccessful Directed Retry, Intra-BSC, with Loss of MS(Loss of HO CMD, T8 > TTRAU), FR Call (TTRAU Expiry) . . . . . . . . . . . 104

1.2.8 Directed Retry, Inter-BSC . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 106

1.2.8.1 Successful Directed Retry, Inter-BSC, FR Call. . . . . . . . . . . . . . . . . . . . . 106

1.2.8.2 Unsuccessful Directed Retry, Inter-BSC, FR Call, no Radio Resource avail-able in Target Cell . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 109

1.2.8.3 Unsuccessful Directed Retry, Inter-BSC, with Reversion to

SDCCH, FR Call (T3124 Expiry). . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 110

1.2.8.4 Unsuccessful Derected Entry, Inter-BSC, with Loss of MS(Loss of HO CMD, T8 < Trr7), FR Call (T8 Expiry) . . . . . . . . . . . . . . . . . . 112

1.2.8.5 Unsuccessful Directed Retry, Inter-BSC, with Loss of MS(Loss of HO CMD, T8 > Trr7), FR Call (Trr7 Expiry). . . . . . . . . . . . . . . . . 114

1.2.9 Forced Handover Due to O & M . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 116

1.2.9.1 Successful Forced Handover Due to O & M. . . . . . . . . . . . . . . . . . . . . . . 116

1.2.9.2 Successful Forced Handover Due to O & M, Inter-BSC, FR Call . . . . . . . 118

1.2.9.3 Successful Forced Intra-Cell Handover Due to O & M, FR Call . . . . . . . . 120

1.2.10 Handover due to BSS Resource Management Criteria(Traffic Handover) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 121

1.2.10.1 Successful Handover due to BSS Resource Management Criteria (TrafficHandover), FR Call . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 121

1.2.10.2 Unsuccessful Inter-Cell Handover due to BSS ResourceManagement Criteria (Traffic Handover), traffic load in Target Cellexceeds the threshold TRFLTH . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 124

1.2.11 Queuing & Preemption . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 126

1.2.11.1 Queuing: Queued Assignment Request for FR TCH Is Served BeforeT11 Expiry, Directed Retry Enabled But No Target Cell Available,Preemption Disabled or Not Allowed for the Requesting Call. . . . . . . . . . 126

1.2.11.2 Queuing: Queued Assignment Request for FR TCH is Discarded from theQueue Before T11 Expiry Due to an Incoming FRAssignment Request with Higher Priority Directed Retry Enabled But No Tar-get Cell Available, Preemption Disabled or Not Allowed for the RequestingCall . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 128

1.2.11.3 Queuing: Queued Assignment Request for FR TCH Is Discarded from QueueDue to T11 Expiry, Directed Retry Enabled But NoTarget Cell Available, Preemption Disabled or Not Allowed for the RequestingCall . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 130

1.2.11.4 Queuing: Queued Handover Request for FR TCH Is Served BeforeTQHO Expiry, Preemption Disabled or Not Allowed for theRequesting Call. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 131

1.2.11.5 Queuing: Queued Handover Request for FR TCH Is Discarded fromthe Queue Before TQHO Expiry Due to an Incoming FR Call with Higher Pri-

ority, Preemption Disabled or Not Allowed for theRequesting Calls. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 133


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1.2.11.6 Queuing: Queued Handover Request for FR TCH Is Discarded fromthe Queue Due to TQHO Expiry, Preemption Disabled or NotAllowed for the Requesting Calls . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 135

1.2.11.7 Preemption: Successful Forced Inter-Cell Handover Due toPreemption, Preempted Assignment Request and Preempting Call Are BothFR . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 136

1.2.11.8 Preemption: Forced Release of Preempted Call Due to Lack ofTarget Cell for Forced Inter-Cell Handover Procedure, Preempted and Pre-empting Call Are Both FR . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 138

1.2.11.9 Preemption: Successful Forced Inter-BSC Handover Due toPreemption, Preempting Handover Request and Preempted Call Are BothFR, Originating BSC of the Preempting Handover Request and Target BSC forthe Forced Handover Are the Same . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 139

1.2.12 HSCSD. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 141

1.2.12.1 Successful HSCSD Call, Mobile Originating, 3 TCHs Used . . . . . . . . . . . 141

1.2.12.2 Successful Inter-cell Handover of an HSCSD Call (3 TCHs Used),Intra-BSC . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 144

1.2.12.3 Forced Intra-cell Handover During HSCSD Assignment Procedure . . . . . 147

1.2.13 Signalling Transactions without TCH . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 149

1.2.13.1 Successful Location Update (Phase 2 MS) . . . . . . . . . . . . . . . . . . . . . . . . 149

1.2.13.2 Successful IMSI Detach (Phase 2 MS) . . . . . . . . . . . . . . . . . . . . . . . . . . . 151

1.2.13.3 Unsuccessful Immediate Assignment Procedure, No SDCCHAvailable. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 152

1.2.13.4 Unsuccessful Immediate Assignment Procedure, No AGCHAvailable (AGCH Overload) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 153

1.2.13.5 Unsuccessful Immediate Assignment Procedure, assigned SDCCH is not

seized by the MS (Phantom RACH Scenario) . . . . . . . . . . . . . . . . . . . . . . 1541.2.13.6 BTS Discards Invalid RACH Messages . . . . . . . . . . . . . . . . . . . . . . . . . . . 155

1.2.13.7 Paging Overload - BTS discards a PAGING REQUEST Message . . . . . . 156

1.2.14 Short Message Service . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 157

1.2.14.1 Successful SMS Mobile Originating in Idle Mode (Phase 2 MS) . . . . . . . . 157

1.2.14.2 Successful SMS Mobile Terminating in Idle Mode (Phase 2 MS) . . . . . . . 159

1.2.14.3 Successful SMS Mobile Originating in Connected Mode. . . . . . . . . . . . . . 161

1.2.14.4 Successful SMS Mobile Terminating in Connected Mode . . . . . . . . . . . . . 162

1.2.15 Advanced Speech Call Items (ASCI) Procedures . . . . . . . . . . . . . . . . . . . 163

1.2.15.1 VGCS Setup Procedure. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 163

1.2.15.2 Immediate Setup Procedure . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 164

1.2.15.3 Common VGCS TCH Assignment . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1651.2.15.4 Free Uplink Procedure . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 166

1.2.15.5 Successful Uplink Allocation Procedure. . . . . . . . . . . . . . . . . . . . . . . . . . . 167

1.2.15.6 Uplink Seized Procedure . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 168

1.2.15.7 VGCS Call Originated by a Dispatcher . . . . . . . . . . . . . . . . . . . . . . . . . . . 169

1.2.15.8 Complete Sequence of ASCI Call Setup and Release . . . . . . . . . . . . . . . 170

1.2.16 Other Procedures. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 173

1.2.16.1 Idle Traffic Channel Supervision . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 173

1.2.16.2 Uplink and Downlink Measurement Reports on Abis. . . . . . . . . . . . . . . . . 174

1.2.16.3 IMSI Trace Invocation for Normal Call Setup. . . . . . . . . . . . . . . . . . . . . . . 175

1.2.16.4 IMSI Trace Invocation for Incoming Inter-BSC Handover . . . . . . . . . . . . . 176

1.3 GPRS Message Flows. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 177


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1.3.1 GPRS Procedures . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 177

1.3.1.1 GPRS Mobility Management: Attach Procedure. . . . . . . . . . . . . . . . . . . . 177

1.3.1.2 GPRS Mobility Management: Detach Procedure . . . . . . . . . . . . . . . . . . . 178

1.3.1.3 GPRS Session Management: Activate PDP Context . . . . . . . . . . . . . . . . 1791.3.1.4 GPRS Session Management: Deactivate PDP Context . . . . . . . . . . . . . . 180

1.3.1.5 GPRS: Paging. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 180

1.3.1.6 GPRS Mobility Management: Routing Area Update . . . . . . . . . . . . . . . . . 181

1.3.1.7 GPRS Mobility Management: Cell Update . . . . . . . . . . . . . . . . . . . . . . . . 183

1.3.1.8 GPRS: Suspend / Resume . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 184

1.3.2 LC/MAC Message Flows . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 186

1.3.2.1 Uplink TBF . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 187

1.3.2.2 Downlink TBF . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 190

1.3.2.3 Concurrent UL TBF. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 193

1.3.2.4 Concurrent DL TBF. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 196

1.4 Location Services - BSS Centric ArchitecturePositioning Method: Cell ID/TA . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 199

1.4.1 Mobile Terminating Location Request (MT-LR*)MS in Idle Mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 199

1.4.2 Mobile Terminating Location Request (MT-LR),MS in dedicated mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 201

1.4.3 Example of an Emergency Call* . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 202

1.4.4 BSSLAP Abort . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 204

1.4.5 BSSLAP Reset (cause: Intra-BSS Handover)(during MT-LR) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 205

1.4.6 BSSLAP Abort (cause: Inter-BSS Handover)

(during MT-LR) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2071.4.7 NI-LR (Emergency Call, LCSNSSC=TRUE) . . . . . . . . . . . . . . . . . . . . . . . 208

1.4.8 NI-LR (Emergency Call, MS is booked in the Cell which is notcreated in the SMLC DB) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 209

2 Counter / Message Abbreviations. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 211

3 Abbreviations . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 217


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1 Performance Measurement Message Flows

1.1 IntroductionThe following sections show the SBS specific message flows of call- and signalling-

transactions on the interfaces Um, Abis and A.

The messages between the network elements (MS, BTS, BSC and MSC) are abbrevi-

ated in the same way as the most common protocol analyzers (e.g. K1103, K1205, MA-

10 etc.) do. For the mapping of the used abbreviations to the complete message names

defined by GSM and the Siemens Abis specifications please refer to Chapter 2 “Abbre-

viations”.

In addition to the messages, the implemented SBS performance measurement counters

are embedded into the message flows in such a way that the association of the counters

to their triggering events becomes clear. As a general rule, the appearance of a counter

within a message flow means that its value is increased by ’1’. Deviations from this rule

are explicitely mentioned in the message flows.

To indicate also the subcounters of the specific measurements the following method is

used: (.).

Example:

“ATINHIRC (2.)” means that the second subcounter of the measurement ATINHIRC

(’downlink quality’) is increased by the marked event

For the long names of the measurements please refer to the document “PM:SBS

Counter”.

iNote: The message flows have to be considered as typical examples for the affectedsignaling transactions. Depending on specific settings in the involved network elements(MSC, BSC), flow traces taken from ’real live’ networks can deviate from the shownmessage flows (especially for the optional sub-procedures Authentication, Ciphering,Early Classmark Sending and TMSI Reallocation).

iNote: If not otherwise defined the blue colour generally indicates the events on the han-dover target resources.In 1.2.11.2 the blue colour indicates the events related to the second (high priority) call.In 1.2.11.5 the blue colour indicates the events related to the high priority callIn 1.2.11.7, 1.2.11.8 and 1.2.11.9 the blue colour indicates the events related topreemting call.In 1.2.5.7 the red colour indicates the BSC serving the first (really external) target cell in

the target cell list of the HANDOVER REQUIRED message.


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1.2 Message Flows

1.2.1 Call Setup Procedures

1.2.1.1 Successful Mobile Originating Cell (MOC), FR Call

BTS BSCMS MSC

CHNRD

NSUCCHPC (4.)

NASUSDPE

CHNREQ

UI (IMASS)

SABM (CMSREQ)

UA

ESTIN (CMSREQ)

CHNAV (SDCCH)

CHNAK

IACMD (IMASS)

TACCBPRO (2.)

SUIMASCA (4.)

NACSUCPR (2.)

RACH

AGCH

SDCCH

SDCCH

DT1 (CICMP)

I (CIMCMD)

I (CIMCMP)

ENCRY (CIMCMD)

MRPCI

DATIN (CIMCMP)

DT1 (CICMD)

SDCCH

SDCCH

DT1 (AUTREP)

I (AUTREQ)

I (AUTREP)

DATRQ (AUTREQ)

DATIN (AUTREP)

CC (AUTREQ)

SDCCH

SDCCH

CR (CL3I; CMSREQ)

NATTSDPE

NACSUCPR (3.)

ATIMASCA (4.)If last SDCCH start

ASDCALTI

Start T_MSRFPCI

Start T3101

Stop T_MSRFPCI

Start T3101


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BTS BSCMS MSC

I (ASS CMD)

PHCRQ

PHCCN

CHNAV (TCH)

CHNAK

DATRQ (ASS CMD)

MTCHBUTI (1.) (start)

DT1 (ASS REQ)

SDCCH

Start TTRAU

Start T_MSRFPCI

Stop TTRAU (**)

I (ASS CMP)

SABM

UAESTIN

SUCTCHSE (1.)

TASSSUCC (2.)

TNTCHCL (1.)

DATIN (ASS CMP)

MRPCI

DT1 (ASS COM)

FACCH

FACCH

FACCH

Stop T_MSRFPCI

DATIN (SETUP)SETUP

DT1 (SETUP)

DT1 (CPROC)

SDCCH

I (CPROC) DATRQ (CPROC)

SDCCH

ATTCHSEI (1.)

TASSATT (2.)

If last TCH start

AALTCHTI (1.)

RELCN

RCHRL (SDCCH)

RCHRA

ASDCALTI

(stop)

RELRQ

Start T10

StopT10


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BTS BSCMS MSC

I (CONACK)

DT1 (ALERT)

I (ALERT)DATRQ (ALERT)

DATIN (CONACK)DT1 (CONACK)

DT1 (CONNECT)DATRQ (CONNECT)

I (CONNECT)

FACCH

FACCH

FACCH

Conversation phase ...

TTRAU is stopped when the BTS receives the (idle) TRAU frames from the TRAU. This happens whenthe BSC throughconnects the Asub-TCH to the Abis-TCH. In case of TCH Assignment this is done on

transmission of the ASSIGNMENT COMMAND.

(**)


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1.2.1.2 Successful Mobile Terminating Call (MTC), FR Call

BTS BSCMS MSC

PGCMD

CHNAV (SDCCH)

TACCBPRO (1.)

NSUCCHPC (1.)

NASUSDPE

TACCBPRO (2.)

SUIMASCA (1.)

NACSUCPR (2.)

NATTSDPE

NACSUCPR (1.), (3.)

ATIMASCA (1.)

If last SDCCH start

ASDCALTI

UDT (PAGIN)

CHNRD

CHNAK

IACMD (IMASS)

UA

ESTIN (PAGRES)

(CL3L; PAGRES)

UI (IMASS)

SABM (PAGRES)

AGCH

SDCCH

UI (PAGREQ)

PCH

SDCCH

CHNREQ

RACH

DATRQ (TRCMD)I (TRCMD)

I SETUP

I (TRCMP)

DT1 (SETUP)DATIN (SETUP)

DATIN (TRCMP) DT1 (TRCMP)

I CCONF DATRQ (CCONF)DT1 (CCONF)

SDCCH

SDCCH

SDCCH

SDCCH

Start T_MSRFPCI

Start T3101

StopT3101

MRPCI

Stop T_MSRFPCI

DT1 (TRCMD)

Optional: Authentication & Ciphering Procedure... (see 1.2.1.1)

NTDPMAIN (1.)


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BTS BSCMS MSC

PHCRQ

PHCCN

ATTCHSEI (1.)

TASSATT (2.)

If last TCH start

AALTCHTI (1.)

DT1 (ASREQ)

CHNAV (TCH)

CHNAK

DATRQ (ASS CMD)

I (ASS CMD)

SABM

ESTIN

DATIN (ASS CMP)

Start TTRAU

Start T_MSRFPCI

Stop TTRAU (**)

TNTCHCL (1.)

SDCCH

FACCH

DT1 (ASS COM)

SUCTCHSE (1.)

TASSSUCC (2.)

I (ASS CMP)

FACCH

UA

SDCCH

MRPCI

Stop T_MSRFPCI


Start T10

StopT10

RELRQ

RCHRL (SDCCH)

RCHRA

ASDCALTI

(stop)

RELCN


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BTS BSCMS MSC

I (CONACK)

DT1 (ALERT)

I (ALERT)DATRQ (ALERT)

DATIN (CONACK)DT1 (CONACK)


I (CONNECT)

FACCH

FACCH

FACCH




(**)


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1.2.1.3 Successful Mobile Originating Cell (MOC) with Direct

Traffic Channel Assignment, FR Call

BTS BSCMS MSC

CHNAV (TCH)

CHNAK

ATTCHSEI (1.)

ATIMASCA (4.)

NASCUCPR (3.)

If last TCH start

AALTCHTI (1.)

NSUCCHPC (10.)

SUCTCHSE (1.)

TNTCHCL (1.)

CHNRD

IACMD (IMASS)

ESTIN (CMSREQ)

MRPCI

UI (IMASS)

SABM (CMSREQ)

AGCH

FACCH

CHNREQ

RACH

MTCHBUTI (1.) (start)Start TTRAU

Start T_MSRFPCI

Stop TTRAU (**)

Stop T_MSRFPCI

I (SETUP)DATIN (SETUP)

DT1 (SETUP)FACCH

UA

FACCH

Optional: Authentication & Ciphering Procedure...(see 1.2.1.1)

DATRQ (CPROC)I (CPROC)

DT1 (CPROC)

FACCH

CR (CL3I;CMSREQ)

TACCBPRO (2.)

SUIMASCA (4.)

NACSUCPR (2.)

Start T3101

StopT3101


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BTS BSCMS MSC

MOMRQ

DT1 (ASS COM)

TASSSUCC (2.)

I (CHMM)

I (CHMMACK)

MOMAK

DATRQ (CHMM)

DATIN (CHMMACK)

DT1 (ASS REQ)


I (CONNECT)

I (CONACK)DATIN (CONACK)

DT1 (CONACK)

DT1 (ALERT)DATRQ (ALERT)

I (ALERT)

FACCH

FACCH

FACCH

FACCH

FACCH




(**)

TASSATT (2.)

(***)

In case of direct TCH assignment the timer T10 is not used. Two not-administrable system internaltimers are used, one for the control of the MOMRQ procedure, one for the control of the CHMMprocedure. In case of expiry of one of these timers, the BSC sends an ASS FAI with cause ’equipmentfailure’ to the MSC.

(***)


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1.2.1.4 Successful Mobile Originating Call (MOC) Using Early

Classmark Sending, FR Call

BTS BSCMS MSC

CHNAV (SDCCH)

CHNAK

NATTSDPE

NACSUCPR (3.)

ATIMASCA (4.)

If last SDCCH start

ASDCALTI

NSUCCHPC (4.)

NASUSDPE

TACCBPRO (2.)

SUIMASCA (4.)

NACSUCPR (2.)

CHNRD

IACMD (IMASS)

ESTIN (CMSREQ)

MRPCI

I (CLAMCH)

CC (CICMD)ENCRY (CIMCMD)

DATIN (CLAMCH) DT1 (CLUPD)

I (CIMCMP)DATIN (CIMCMP)

DT1 (CICMP)

I (TRCMD) DT1 (TRCMD)

UI (IMASS)

I (CMSREQ)

AGCH

SDCCH

CHNREQ

RACH

SDCCH

I (CIMCMD)

SDCCH

SDCCH

SDCCH

CR (CL3I; CMSREQ)

I (CPROC) DATRQ (CPROC)

DATIN (SETUP)I (SETUP) DT1 (SETUP)

DT1 (CPROC)SDCCH

SDCCH

Start T3101

StopT3101

Stop T_MSRFPCI

Start T_MSRFPCI

MRPCI

DATRQ (TRCMD)


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BTS BSCMS MSC

DT1 (ASREQ)

PHCRQ

PHCCN

CHNAV (TCH)

CHNAK

DATRQ (ASS CMD)

ESTIN

I (ASS CMD)

I (ASS CMP)DATIN (ASS CMP)

DT1 (TRCMP)

I (TRCMP)DATIN (TRCMP)

DT1 (ASS COM)

MRPCI

SUCTCHSE (1.)

TASSSUCC (2.)

Start TTRAU

Start T_MSRFPCI

Stop TTRAU (**)

FACCH

Stop T_MSRFPCI

SDCCH

SDCCH

SABM

FACCH

UAFACCH

ATTCHSEI

TASSATT (5.)

If last TCH start

AALTCHTI (1.)


TNTCHCL (1.)

Start T10

StopT10

RELRQ

ASDCALTI (stop)

RELCN

RCHRL (SDCCH)

RCHRA


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BTS BSCMS MSC

DT1 (ALERT)

Call setup continuation...



(**)

DATRQ (ALERT)I (ALERT)

FACCH


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1.2.1.5 Successful Mobile Terminating Call (MTC), using Early Classmark,

Sending, FR Call

BTS BSCMS MSCPGCMD

CHNAV (SDCCH)

TACCBPRO (1.)

NSUCCHPC (1.)

NASUSDPE

TACCBPRO (2.)

SUIMASCA (1.)

NACSUCPR (2.)

NATTSDPE

NACSUCPR (1.), (3.)

ATIMASCA (1.)

If last SDCCH start

ASDCALTI

UDT (PAGIN)

CHNRD

CHNAK

IACMD (IMASS)

UA

ESTIN (PAGRES)

UI (IMASS)

SABM (PAGRES)

AGCH

SDCCH

UI (PAGREQ)

PCH

SDCCH

CHNREQ

RACH

DT1 (CICMP)

Start T_MSRFPCI

Start T3101

StopT3101

ENCRY (CIMCMD)I (CIMCMD)

SDCCHI (CLAMCH)

SDCCH

I (CIMCMP)SDCCH

DATIN (CLAMCH)DT1 (CLUPD)

MRPCI

Stop T_MSRFPCI

DATIN (CIMCMP)

CR (CL3I; PAGRES)

CC (CIMCMD)


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24 A30808-X3247-K41-4-7618


BTS BSCMS MSC

PHCRQ

PHCCN

ATTCHSEI (1.)

TASSATT (2.)

If last TCH start

AALTCHTI (1.)

DT1 (ASREQ)

CHNAV (TCH)

CHNAK

DATRQ (ASS CMD)

I (ASS CMD)

SABMESTIN

DATIN (ASS CMP)

Start TTRAU

Start T_MSRFPCI

Stop TTRAU (**)

TNTCHCL (1.)

SDCCH

FACCH

DT1 (ASS COM)

SUCTCHSE (1.)

TASSSUCC (2.)

I (ASS CMP)

FACCH

UA

SDCCH

MRPCI

Stop T_MSRFPCI


Start T10

StopT10

DATRQ (TRCMD)I (TRCMD)

I SETUP

I (TRCMP)

DT1 (SETUP)DATIN (SETUP)

DATIN (TRCMP) DT1 (TRCMP)

I CCONF DATRQ (CCONF) DT1 (CCONF)

SDCCH

SDCCH

SDCCH

SDCCH

DT1 (TRCMD)


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FACCHI (ALERT)

BSCMS BTS MSC

DATRO (ALERT)DT1 (ALERT)

Call setup continuation...



(**)

RELRQ

RCHRL (SDCCH)

RCHRA

ASDCALTI

(stop)

RELCN


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1.2.1.6 Unsuccessful Mobile Originating Call (MOC), Subscriber B Busy,

FR Call

BTS BSCMS MSC

DT1 (ASS COM)

SUCTCHSE (1.)TASSSUCC (2.)

I (ASS CMP)DATIN (ASS CMP)

MRPCI

RELRQ

Call setup ... (see Successful MOC)

Call release... (see ‚Normal call release, originated by network‘)

RCHRL (SDCCH)

RELCN

DT1 (DISC)

ASDCALTI (stop)

RCHRA

(cause: user busy)

FACCH

I (DISC)

SDCCH

DATRQ (DISC)

Stop T_MSRFPCI

Stop T10


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1.2.1.7 Unsuccessful Mobile Originating Call (MOC), No TCH Available,

FR Call


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28 A30808-X3247-K41-4-7618


BTS BSCMS MSC

I (SETUP)DATIN (SETUP)

TASSFAIL (8.)

ATTCHSEI (1.)ATCHSMBS (1.)

TASSATT (2.)

DT1 (SETUP)

DT1 (CPROC)DATRQ (CPROC)

I (CPROC)DT1 (ASS REQ)

DT1 (ASS FAI)

(cause: no radio resource available)

Call release ... (see ‚Normal call release, originated by network‘)

DT1 (DISC)

(cause: normal, unspecified)I (DISC)

FACCH

DATRQ (DISC)

SDCCH

SDCCH


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1.2.1.8 Successful Mobile Originated Call (MOC) in a Concentric Cell

(inner area), FR Call

BTS BSCMS MSC

I (CPROC)DATRQ (CPROC)


ATTCHSEI (1.)

TASSATT (2.)

If last TCH start

AALTCHTI (1.)

DATIN (SETUP)I (SETUP)

DT1 (SETUP)

DT1 (CPROC)

DT1 (ASS REQ)

PAREQ

PAREA

PHCRQ

PHCCN

CHNAV (TCH)

CHNAK

Call setup ...

SDCCH

SDCCH

(preferred area type: inner area)

Start TTRAU

Start T_MSRFPCI

I (ASS CMD)

SDCCH

DATRQ (ASS CMD)

Stop TTRAU (**)

FACCH

SABM

UAFACCH

I (ASS CMP)DATIN (ASS CMP)FACCH

TNTCHCL (1.) (for concentric cells)

ESTIN

SUCTCHSE (1.)

TASSSUCC (2.)

DT1 (ASS COM)

Start T10

StopT10


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30 A30808-X3247-K41-4-7618


BTS BSCMS MSC

RELCN

AALTCHTI (1.) (stop)

MTCHBUTI (1.)(stop)

DT1 (ALERT)

MRPCI

RELRQ

RCHRL (SDCCH)

RCHRA

Call setup continuation ...



(**)

Stop T_MSRFPCI

DATRQ (ALERT)I (ALERT)

FACCH


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1.2.1.9 Successful Mobile Emergency Call (MEC), FR Call

BTS BSCMS MSC

CHNREQ

CHNAV (SDCCH)

CHNAK

CR (CL3I; CMSREQ)

NATTSDPE

NACSUCPR (3.)

ATIMASCA (2.)

If last SDCCH start

ASDCALTI

TACCBPRO () (2.)

SUIMASCA (2.)

NACSUCPR (2.)

NSUCCHPC (2.)

NASUSDPE

CHNRD

IACMD (IMASS)UI (IMASS)

SABM (CMSREQ)

ESTIN (CMSREQ)

MRPCI

RACH (request reference: emergency

call)

AGCH

SDCCH (CM service type: emergency

call establishment)

I (EMSETUP)DATIN (EMSETUP)

DT1 (EMSETUP)

DT1 (CPROC)

SDCCH

Optional: Authentication & Ciphering Procedure (see 1.2.1.1)

DATRQ (CPROC)I (CPROC)

SDCCH

UA

SDCCH

ATTCHSEI (1.)

TASSATT (2.)

If last TCH start

AALTCHTI (1.)

DT1 (ASREQ)

Call setup continuation ...

Stop T_MSRFPCI

Start T_MSRFPCI

Start T3101

StopT3101


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1.2.2 Unsuccessful Assignment Procedures

1.2.2.1 Unsuccessful TCH Assignment Procedure with Reversion to

SDCCH, FR Call

BTS BSCMS MSC

DT1 (ASS REQ)

Start T_MSRFPCI

DT1 (ASS FAI)

TASSFAIL (2.)

PHCCN

CHNAV (TCH)

CHNAK

DATRQ (ASS CMD)

I (ASS CMD)

(cause: radio interface failure,

DT1 (DISC)

Call setup ...

Old FACCH

Start TTRAU


(cause: normal, unspecified)

I (ASS FAIL)

SDCCH

New FACCH

SABM

ESTIN

PHCRQ

ATTCHSEI (1.)

TASSATT (2.)

If last TCH start

AALTCHTI

Access to targetchannel fails...

SABM

SDCCH

UA

(Cause: protocolerror unspecified)

DATIN (ASS FAIL)

reversion to old channel)

Start T10

Stop T10

Call release ...

DATRQ (DISC)I (DISC)

SDCCH


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1.2.2.2 Unsuccessful TCH Assignment Procedure with Loss of

ASSIGNMENT COMMAND (T10 < T_MSRFPCI), FR Call

(T10 Expiry)

BTS BSCMS MSC

DT1 (ASS REQ)

Start T10

Start T_MSRFPCI

Expiry T10 DT1 (ASS FAI)

ATTCHSEI (1.)

TASSATT (2.)

If last TCH start

AALTCHTI

TASSFAIL (6.)

PHCRQ

PHCCN

CHNAV (TCH)

CHNAK

DATRQ (ASS CMD)

I (ASS CMD)

(cause: radio interface msg failure)

DT1 (CL CMD)

(cause: call control)

Call setup ...

SDCCH

Start TTRAU

Stop TTRAU (**)

Release of resources ...



(**)


ASS CMD islost ...


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34 A30808-X3247-K41-4-7618


1.2.2.3 Unsuccessful TCH Assignment Procedure with Loss of

ASSIGNMENT COMMAND (T10 > T_MSRFPCI), FR Call

(T_MSRFPCI Expiry)

BTS BSCMS MSC

DT1 (ASS REQ)

Start T10

Start T_MSRFPCI

DT1 (CL REQ)

ATTCHSEI (1.)

TASSATT (2.)

If last TCH start

AALTCHTI

NRFLTCH (4.)

PHCRQ

PHCCN

CHNAV (TCH)

CHNAK

DATRQ (ASS CMD)

I (ASS CMD)


DT1 (CL CMD)


Call setup ...

SDCCH

Start TTRAU

Stop TTRAU (**)


ASS CMD islost ...

Expiry T_MSRFPCICONFL


(cause: T_MSRFPCI expired)

(**) TTRAU is stopped when the BTS receives the (idle) TRAU frames from the TRAU. This happens whenthe BSC throughconnects the Asub-TCH to the Abis-TCH. In case of TCH Assignment this is done on



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InformationSystem


1.2.2.4 Unsuccessful TCH Assignment Procedure LAPDm I-Frame with

ASSIGNMENT COMMAND not acknowledged by MS (T200 Expiry),

FR Call

BTS BSCMS MSC

DT1 (ASS REQ)

Start T10

Start T_MSRFPCI

ATTCHSEI (1.)

TASSATT (2.)

If last TCH start

AALTCHTI (1.)

PHCRQ

PHCCN

CHNAV (TCH)

CHNAK

DATRQ (ASS CMD)

Call setup ...

Start TTRAU

Stop TTRAU (**)



I (ASS CMD)

SDCCH

DT1 (CL REQ)


DT1 (CL CMD)


ERRIN

(cause: timer T200 expiredN200+1 times))



(**)

NRFLSDCC (1.)

I (ASS CMD)

I (ASS CMD)

I (ASS CMD)

SDCCH

SDCCH

SDCCH

T200 expired

N200+1 times))

T200

T200

T200


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36 A30808-X3247-K41-4-7618


1.2.3 Call Release Procedures

1.2.3.1 Normal Call Release (Originated by MS), FR Call

BTS BSCMS MSC

I (DISC)

DATRQ (RELEAS)

DATIN (REL CMP)

MTCHBUTI (1.) (stop)


DATIN (DISC)DT1 (DISC)

DT1 (RELEAS)

I (RELEAS)

I (RELCMP)

DT1 (REL CMP)

DATRQ (CHREL)DT1 (CL CMD)

I (CHREL)

DESACDT1 (CL CMP)

RLSD

RLC

RELIN

RCHRL (TCH)

RCHRA


(cause: normal call clearing)FACCH

FACCH

FACCH

FACCH

DISC

FACCHUA

FACCH

(cause: normal call clearing)


(cause: end user originated)

Start T3110

Stop T3110

Start T3109

Stop T3109

Start T3111

Expiry T3111


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1.2.3.2 Normal Call Release (Originated by Network), FR Call

BTS BSCMS MSC

I (DISC)

DATRQ (RELEAS)

DATIN (REL CMP)



DATIN (DISC)DT1 (DISC)

DT1 (RELEAS)

I (RELEAS)

I (RELCMP)

DT1 (REL CMP)

DATRQ (CHREL)

DT1 (CL CMD)

I (CHREL)

DESAC

DT1 (CL CMP)

RLSD

RLC

RELIN

RCHRL (TCH)

RCHRA


FACCH

FACCH

FACCH

FACCH

DISC

FACCH

UA

FACCH



(cause: end user originated)


Start T3110

Stop T3110

Start T3109

Stop T3109

Start T3111

Expiry T3111


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38 A30808-X3247-K41-4-7618


1.2.3.3 Abnormal Call Release Procedure

Call drop: BTS sends CONNECTION FAILURE INDICATION

to the BSC

BTS BSCMS MSC

CONFL

TTRAU expiry

orTSYNC expiry

NRFLTCH (7.)

or *

NRFLSDCC (7.)

(cause: radio link failure)

Radio link counterin the BTS (RDLNKTBS)reaches “0”

CONFL

Call or dedicated connection (SDCCH or FACCH) established...

or...

(cause: remote transcoder failure)

NRFLTCH (8.)

or *

NRFLSDCC (8.)

T_MSRFPCI expiry

CONFL

(cause: T_MSRFPCI expired)

NRFLTCH (4.)

or *

NRFLSDCC (4.)

or...


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InformationSystem


BTS BSCMS MSC

DT1 (CL REQ)

RELCN

RCHRA

DT1 (CL CMD)

(cause: radio interface

DT1 (CL CMP)RELRQ

message failure)

Reset T_MSRFPCI

RCHRL (New TCH)


MS-BTS distanceexceeds the thresholdEXCDIST

CONFL

(cause: distance limit exceeded)

NRFLTCH (5.)

or *

NRFLSDCC (5.)

If the CONNECTION FAILURE INDICATION is received for a TCH, NRFLTCH is triggered; if it isreceived for an SDCCH, NRFLSDCC is triggered.

(*)

or...


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40 A30808-X3247-K41-4-7618


1.2.3.4 Abnormal Call Release Procedure

Call drop: BTS sends ERROR INDICATION to the BSC

BTS BSCMS MSC

ERRIN

NRFLTCH (1.)

or *

NRFLSDCC (1.)

(cause: timer T200 expired

N200+1 times)

BTS has sent a Um layer 2 (LAPDm)message in ’acknowledged mode’N200+1 times to the MS withoutreceiving an appropriate layer 2acknowledgement.

Call or dedicated connection (SDCCH or FACCH) established...

NRFLTCH (2.)

or *

NRFLSDCC (2.)

MS has sent a Um layer 2 (LAPDm)

message DM (Disconnect Mode) to theBTS while the BTS-MS communicationis in ’multiple frame stablished state’

ERRIN

(cause: unsolicited DM response,

multiple frame established state)

DMFACCH or SDCCH

or...


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BTS BSCMS MSC

DT1 (CL REQ)

RELCN

RCHRA

DT1 (CL CMD)


DT1 (CL CMP)RELRQ

message failure)

Reset T_MSRFPCI

RCHRL (New TCH)


NRFLTCH (3.)

or *NRFLSDCC (3.)

If the ERROR INDICATION is received for a TCH, NRFLTCH is triggered; if it is received for a SDCCH,NRFLSDCC is triggered.

(*)

ERRIN

(cause: sequence error)

BTS has detected irregularitiesin the Um layer 2 (LAPDm) flowcontrol functions (wrongmessage sequence) useds in’acknowledged mode’

or...


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1.2.4 Inter-Cell Handover, Intra-BSC

1.2.4.1 Successful Inter-Cell Handover, Intra-BSC, FR Call

BTSold BTSnew BSCMS MSC

CHNAK

CHNAV (New TCH)

I (HO CMD)


Start T8

HANDO

Start T3124

Stop T3124Start T3105

ATTCHSEI (1.)

ATINHIRC (*)

If last TCH start

AALTCHTI (1.)

Start THORQST

Start TTRAU

Stop TTRAU (**)

Start T_MSRFPCI

UI (MEAS REP)

HO ACCESS

UI (PHYS INFO)

SACCH

HO ACCESS

UI (MEAS REP)

SACCH

UI (MEAS REP)

SACCH

FACCH

FACCH

FACCH

FACCH

(with HO cause)BWHCI

DATRQ (HO CMD)

AININIRH (*)

AOUINIRH (*)

Stop T3105

ESTIN

SABM

UA

FACCH

FACCHTNTCHCL (1.)

Call in progress...


43/218

A30808-X3247-K41-4-7618 43

InformationSystem



MRPCI



Stop T8

DATIN (HO CMP)

SUCTCHSE (1.)

DT1 (HOPER)

SINTHINT (*)

SININIRH (*)

SOUINIRH (*)

SINHOBSC (*)

Note: Subcounter depends on the handover cause value contained in the HANDOVER CONDITION

INDICATION.

TTRAU is stopped when the BTS receives the (idle) TRAU frames from the TRAU. This happens whenthe BSC throughconnects the Asub-TCH to the Abis-TCH. In case of intra-BSC handover this is done

after receipt of the HANDOVER DETECT message.

(**)

(*)

Stop T_MSRFPCI (with HO cause)

RELRQ

RELCN

RCHRL (Old TCH)

RCHRA

I (HO CMP)

FACCH

Call continuation ...


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44 A30808-X3247-K41-4-7618


1.2.4.2 Unsuccessful Inter-Cell Handover Attempt, Intra-BSC,

No TCH Available in Target Cell, FR Call


ATTCHSEI (1.)

ATCHSMBS (1.)

ATINHIRC (*)

NHOINRHA (3.)

......

......

UI (MEAS REP)

SACCH

UI (MEAS REP)

SACCH

UI (MEAS REP)SACCH

Note: Subcounter depends on the handover cause value contained in the HANDOVER CONDITON

INDICATION.

TTRAU is stopped when theBTS receives the (idle) TRAU frames from the TRAU. This happens when

the BSC throughconnects the Asub-TCH to the Abis-TCH. In case of intra-BSC handover this is doneafter receipt of the HANDOVER DETECT message.

(*)

BWHCI

(with HO cause)

ATTCHSEI (1.**)

ATCHSMBS (1.**)ATINHIRC (**)

NHOINRHA (3.**)

BWHCI

(with HO cause)

Start THORQST

Expiry THORQST

Call in progress...


(**)


45/218

A30808-X3247-K41-4-7618 45

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1.2.4.3 Unsuccessful Inter-Cell Handover, Intra-BSC, with Reversion

to Old TCH (T3124 Expiry), FR Call


CHNAK

CHNAV (New TCH)

I (HO CMD)


Start T8

AININIRH (*)

AOUINIRH (*)

Start T3124

Expiry T3124

ATTCHSEI (1.)

ATINHIRC (*)

If last TCH start

AALTCHTI (1.)

Start THORQST

Start TTRAU

Start T_MSRFPCI

UI (MEAS REP)

HO ACCESS

SACCH

DATRQ (HO CMD)

BWHCI

(with HO cause)

HO ACCESS

UI (MEAS REP)

SACCH

UI (MEAS REP)

SACCH

FACCH

FACCH

FACCH

HO ACCESS

does not get

through

SABM

UAFACCH

FACCH

ESTIN

HO ACCESS

FACCH

Stop T8

HOFITABS

UNINHOIE (*)

I (HO FAIL)

FACCH DATIN (HO FAIL)

(cause: protocol error, unspecified)

Call in progress...


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46 A30808-X3247-K41-4-7618



RCHRL (New TCH)




INDICATION.

(*)

Reset T_MSRFPCI

RCHRA

Reset TTRAU



47/218

A30808-X3247-K41-4-7618 47

InformationSystem


1.2.4.4 Unsuccessful Inter-Cell Handover, Intra-BSC, with Loss of MS

(Loss of HO CMD, T8


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48 A30808-X3247-K41-4-7618






INDICATION.

(*)

Reset T_MSRFPCI

Reset TTRAU

RCHRA

RLSD

RCHRL (New TCH)

RLC

Call release ...


49/218

A30808-X3247-K41-4-7618 49

InformationSystem


1.2.4.5 Unsuccessful Inter-Cell Handover, Intra-BSC with Loss of MS

(Loss of HO CMD, T8>TTRAU), FR Call (TTRAU Expiry)


CHNAK

CHNAV (New TCH)

I (HO CMD)


Start T8

AININIRH (*)

AOUINIRH (*)

ATTCHSEI (1.)

ATINHIRC (*)

If last TCH start

AALTCHTI (1.)

Start THORQST

Start TTRAU

Start T_MSRFPCI

UI (MEAS REP)

SACCH

DATRQ (HO CMD)

BWHCI

(with HO cause)

UI (MEAS REP)

SACCH

UI (MEAS REP)

SACCH

FACCH

NRFLTCH (8.)

HO CMD islost ...

DT1 (CL REQ)


message failure)

DT1 (CL CMD)

Expiry TTRAU CONFL

(Cause: remote

transcoder failure)

DT1 (CL CMP)

Call in progress...


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INDICATION.

(*)

RELRQ

RELCN

RCHRA

RCHRL (New TCH)

RCHRL (Old TCH)

RCHRA

RLSD

RLC

Reset T_MSRFPCI


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A30808-X3247-K41-4-7618 51

InformationSystem


1.2.4.6 Unsuccessful Inter-Cell Handover, Intra-BSC, with Loss of MS,

Handover Access Failure (No SABM after Transmission of

PHYSICAL INFO, [(NY1+1) * T3105]


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52 A30808-X3247-K41-4-7618



MTCHBUTI (1.)

(stop)

AALTCHTI (1.)

(stop)


INDICATION.

(*)

RELRQ

RELCN

RCHRA

RCHRL (New TCH)

RCHRL (Old TCH)

RCHRA

RLSD

RLC

NRFLTCH (6.)

DT1 (CL REQ)


message failure)

DT1 (CL CMD)

CONFL

(cause: HO access

failure)

DT1 (CL CMP)

Start T3105

FACCH

UI (PHYS INFO)

Note: T3105 expires (NY1+1) times.(***)

MSdoes not reacttoPHYSINFO, noSABM is receivedat the BTS.

Expiry T3105 (***)

Expiry T3105


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1.2.4.7 Successful Inter-Cell Handover (Intra-BSC) between Colocated

Concentric Cells, FR Call


CHNAK

CHNAV (New TCH)

I (HO CMD)


Start T8

AININIRH (*)

AOUINIRH (*)

HANDOStart T3124

ATTCHSEI (1.)ATINHIRC (*)

If last TCH start

AALTCHTI (1.)

Start TTRAU

Stop TTRAU (**)

Start T_MSRFPCI

UI (MEAS REP)

SACCH

DATRQ (HO CMD)

BWHCI

(with HO cause)

HO ACCESS

UI (MEAS REP)

SACCH

UI (MEAS REP)

SACCH

FACCH

FACCH


UI (PHYS INFO)

FACCH

Stop T3105

ESTIN

TNTCHCL (1. for

concentric cells)

SABM

UA

FACCH

FACCH

Call in progress...

PAREA

PAREQ


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54 A30808-X3247-K41-4-7618



MRPCI



Stop T8

DATIN (HO CMP)

SUCTCHSE (1.)

DT1 (HOPER)

SINTHINT (*)

SININIRH (*)

SOUINIRH (*)

SINHOBSC (*)

Note: Subcounterdepends on the handover cause value contained in the HANDOVER CONDITION

INDICATION.



(**)

(*)


RELRQ

RELCN

RCHRL (Old TCH)

RCHRA

I (HO CMP)

FACCH



55/218


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56 A30808-X3247-K41-4-7618



MRPCI

MTCHBUTI (1.)

(stop)

AALTCHTI (1.)

(stop)

SUCTCHSE (1.)

DT1 (HOPER)

Note: Subcounter depends on the handover cause value contained in the BWHCI.



(**)

(*)

Stop T_MSRFPCI

(with HO cause)

RELRQ

RELCN

RCHRL (Old TCH)

RCHRA


HO ACCESS is transmitted exactly 4 times, the MS does not wait for any response from the BTS butdirectly sets up the layer 2 connection (using the SABM) after the last HO ACCESS.

(***)


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A30808-X3247-K41-4-7618 57

InformationSystem


1.2.4.9 Successful Inter-Cell Handover, Intra-BSC, MSC Controlled, FR Call

CHNAK

DT1 (HO RQD)

UI (MEAS REP)

SACCH

UI (MEAS REP)

SACCH

UI (MEAS REP)

SACCH

CR (HO REQ)

I (HO CMD)

FACCH

CHNAV (New TCH)

HANDOFACCH


Call in progress...

Start THORQSTBWHCI

(with HO cause)

Start T7

MTCHBUTI (1.) (start)Start TTRAU (**)

Start T_MSRFPCI CC (HO RAC; HO CMD)

AOUINIRH (*)

AININIRH (*)

Stop T7

DATRQ (HO CMD)

Start T8

HO ACCESS

Stop TTRAU (**)

Start T3124

DT1 (HO CMD; HO CMD) (***)

ATTCHSEI (1.)

if last TCH start

AALTCHTI (1.)


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58 A30808-X3247-K41-4-7618


ESTIN

DATIN (HO CMP)

MRPCI

DT1 (HO CMP)

DT1 (CL CMP)

DT1 (CL CMD)


INDICATION.

TTRAU is stopped when the BTS receives the (idle) TRAU frames from the TRAU. This happens when

the BSC throughconnects the Asub-TCH to the Abis-TCH. In case of MSC-controlled handover this is

done on the CHANNEL ACTIVATION ACKNOWLEDGE for the TCH in the target BTS.

(**)

(*)

FACCH

FACCH

FACCH

FACCH

(cause: handover

successful)

HANDOVER COMMAND contains the BCCH and BSIC frequency of an internal neighbour cell.(***)


Stop T3124

PHYS INFO

Start T3105

Stop T3105

SABM

TNTCHCL (1.)

I (HO CMP)

UA

SUCTCHSE (1.)

Stop T8

SOUINIRH (*)

SININIRH (*)

RELRQ

RELCN

RCHRL (Old TCH)

RCHRA

MTCHBUTI (stop)

AALTCHTI (stop)

Stop T_MSRFPCI


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A30808-X3247-K41-4-7618 59

InformationSystem


1.2.4.10 Successful SDCCH-SDCCH Inter-Cell Handover, Intra-BSC


CHNAK

CHNAV (New SDCCH)

I (HO CMD)Start T8

HANDO

Start T3124


NATTSDPE

ATINHIRC (*)If last SDCCH start

ASDCALTI

Start THORQST

Start T_MSRFPCI

UI (MEAS REP)

HO ACCESS

UI (PHYS INFO)

SACCH

HO ACCESS

UI (MEAS REP)

SACCH

UI (MEAS REP)

SACCH

SDCCH

SDCCH

SDCCH

SDCCH

(with HO cause)

BWHCI

DATRQ (HO CMD)

AININIRH (*)AOUINIRH (*)

AISHINTE

Stop T3105

ESTIN

SABM

UA

SDCCH

SDCCH

SDCCH transaction or call in SDCCH phase in progress ...

Stop T8

DATIN (HO CMP)

SINTHINT (*)

SININIRH (*)

SOUINIRH (*)

SISHINTE

SINHOBSC (*)

I (HO CMP)

FACCH


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60 A30808-X3247-K41-4-7618



MRPCI

ASDCALTI (stop)

NASUSDPE

DT1 (HOPER)


INDICATION.

(*)


RELRQ

RELCN

RCHRL (Old SDCCH)

RCHRA



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1.2.4.11 Unsuccessful SDCCH-SDCCH Inter-Cell Handover Attempt,

Intra-BSC, No SDCCH Available in Target Cell


NATTSDPE

ATSDCMBS

ATINHIRC (*)

NHOINRHA (3.)

......

......

UI (MEAS REP)

SACCH

UI (MEAS REP)

SACCH

UI (MEAS REP)SACCH

Note: Subcounter depends on the handover cause value contained in the HANDOVER CONDITON

INDICATION.


the BSC throughconnects the Asub-TCH to the Abis-TCH. In case of intra-BSC handover this is doneafter receipt of the HANDOVER DETECT message.

(*)

BWHCI

(with HO cause)

NATTSDPE (**)

ATSDCMBS (**)

ATINHIRC (**)NHOINRHA (3.**)

BWHCI

(with HO cause)

Start THORQST

Expiry THORQST

Call in progress...


(**)


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62 A30808-X3247-K41-4-7618


1.2.4.12 Unsuccessful SDCCH-SDCCH Inter-Cell Handover, Intra-BSC, with

Loss of MS (Loss of HO CMD, T8 Expiry)


CHNAK

CHNAV (New SDCCH)

I (HO CMD)

Start T8

AININIRH (*)

AOUINIRH (*)

AISHINTE

NATTSDPE

ATINHIRC (*)

If last SDCCH start

ASDCALTI

Start THORQST

Start T_MSRFPCI

UI (MEAS REP)

SACCH

DATRQ (HO CMD)

BWHCI

(with HO cause)

UI (MEAS REP)

SACCH

UI (MEAS REP)

SACCH

SDCCH

Expiry T8

UNIHIRLC

HO CMD islost ...

DT1 (CL REQ)


message failure)

DT1 (CL CMD)

DT1 (CL CMP)RELCN

RELRQ

RCHRL (Old SDCCH)

RCHRA

Call in progress...


63/218

A30808-X3247-K41-4-7618 63

InformationSystem



ASDCALTI (stop)


INDICATION.

(*)

Reset T_MSRFPCI

RCHRA

RLSD

RCHRL (New SDCCH)

RLC

Call release ...


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64 A30808-X3247-K41-4-7618


1.2.5 Inter-Cell Handover, Inter-BSC

1.2.5.1 Successful Inter-Cell Handover, Inter-BSC, FR Call

BTSold BTSnewMS

CHNAK

Start T7

Start T3124

HO ACCESS

DT1 (HO DET)

I (HO CMD)

HANDO

Stop T7

BSCnewBSCold MSC

ATINBHDO (*)

DT1 (HO RQD)

CR (HO REQ)

DATRQ (HO CMD)

UI (MEAS REP)

SACCH

BWHCI(with HO cause)

UI (MEAS REP)

SACCH

UI (MEAS REP)

SACCH

Start THORQST

Start TTRAU

Start T_MSRFPCI


ATTCHSEI (1.)

If last TCH start

AALTCHTI (1.)

Stop TTRAU (**)

CC (HO RAC; HO CMD)

DT1 (HO CMD; HO CMD)

Start T8FACCH

FACCH

HO ACCESS

FACCH

Start Trr7 (***)

CHNAV (New TCH)

UI (PHYS INFO)


FACCH

Call in progress...


65/218

A30808-X3247-K41-4-7618 65

InformationSystem


BTSold BTSnewMS

I (HO CMP)

DATIN (HO CMP)

MRPCI

DT1 (HO CMP)

RELRQ

DT1 (CL CMD)

Stop T8

SUINBHDO (*)

BSCnewBSCold MSC

DT1 (CL CMP)RELCN

RCHRA

RLSD

SUCTCHSE (1.)




INDICATION.

TTRAU is stopped when the BTS receives the (idle) TRAU frames from the TRAU. This happens whenthe BSC throughconnects the Asub-TCH to the Abis-TCH. In case of inter-BSC handover this is done on

the CHANNEL ACTIVATION ACKNOWLEDGE for the TCH in the target BTS.

(**)

(*)

(cause: handover

successful)

FACCH

Stop T_MSRFPCI

SABM

Stop T3105

TNTCHCL (1.)

ESTIN

UA

FACCH

FACCH

Trr7 is an MSC timer which supervises the receipt of a HO CMP after transmission of a HO CMD.(***)

Stop Trr7 (***)

RLC

RCHRL (Old TCH)



66/218

66 A30808-X3247-K41-4-7618


1.2.5.2 Unsuccsessful Inter-Cell Handover, Inter-BSC, No TCH

Available in Target Cell, FR Call

BTSold BTSnewMS BSCnewBSCold MSC

ATTCHSEI (1.)

ATCHSMBS (1.)

Start T7

DT1 (HO RQD)

CR (HO REQ)

UI (MEAS REP)

SACCH

BWHCI

(with HO cause)

UI (MEAS REP)

SACCH

UI (MEAS REP)

SACCH

Start THORQST

(cause: no radio

resource available)

CREF (HO FAI)

DT1 (HO RRJ)

Expiry T7

Call in progress...


NHOINRHA (2.)*

NRINHDFL

(cause: no radio

resource available)

Note: Subcounter (2.) of the measurement NHOINRHA is triggered when the administrable BSSMAP

timer T7 (database parameter name BSCT7) expires; with suitable settings of BSCT7 this happens

after the receipt of a HANDOVER REQUIRED REJECT message from the MSC. This means that the

timer T7 must be set appropriately (e.g. BSCT7=HLFSEC-6) to ensure that NHOINRHA (2.) counts

correctly in case of Inter-BSC handover.

If - by chance - the call is released before T7 expires, NHOINRHA (2.) is not triggered.

(*)


67/218

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InformationSystem


1.2.5.3 Unsuccessful Inter-Cell Handover, Inter-BSC, with Reversion

to Old TCH, FR Call (T3124 Expiry)


CHNAK

Start T7

Start T3124

HO ACCESS

I (HO CMD)

Stop T7

ATINBHDO (*)

DT1 (HO RQD)CR (HO REQ)

DATRQ (HO CMD)

UI (MEAS REP)

SACCH

BWHCI

(with HO cause)

UI (MEAS REP)

SACCH

UI (MEAS REP)

SACCH

Start THORQST


ATTCHSEI (1.)

If last TCH start

AALTCHTI (1.)

CC (HO RAC; HO CMD)


Start T8FACCH

FACCH

HO ACCESS

FACCH

HO ACCESSdoes not get

through

Start TTRAU

Start T_MSRFPCI

Stop TTRAU (**)Start Trr7 (***)

CHNAV (New TCH)

SABMESTINFACCH

Expiry T3124

Call in progress...


68/218

68 A30808-X3247-K41-4-7618





DT1 (HO FAIL)

NRUNINHD

DT1 (CL CMD)

DT1 (CL CMP)

RLSD

RCHRA

RLC


INDICATION.



(**)

(*)

UA

I (HO FAIL)

DATIN (HO FAIL)

Stop T8

FACCH

FACCH (cause:

protocol error

unspecified)

(cause: equipment

failure)


RCHRL (New TCH)


Reset T_MSRFPCI

Stop Trr7 (***)


69/218

A30808-X3247-K41-4-7618 69

InformationSystem


1.2.5.4 Unsuccessful Inter-Cell Handover, Inter-BSC with Loss of MS

(Loss of HO CMD, T8


70/218

70 A30808-X3247-K41-4-7618


BTSold BTSnewMS

DT1 (CL CMD)

BSCnewBSCold MSC

DT1 (CL CMP)

RLSD

RLC





(**)

DATRQ (CHREL)

DESAC

RELIN

RCHRA

Expiry Trr7 (***)

DT1 (CL CMD)

DT1 (CL CMP)

RLSD

RCHRA

RLC

(cause: equipment

failure)

Trr7 is an MSC timer which supervises the receipt of a HO CMP after transmission of a HO CMD.Its value is hardcoded to 15 sec..

(***)

Note: Subcounter dependson the handover cause value contained in the HANDOVER CONDITION

INDICATION.

(*)

RCHRL (New TCH)

RCHRL (Old TCH)

Reset T_MSRFPCI


71/218

A30808-X3247-K41-4-7618 71

InformationSystem


1.2.5.5 Unsuccessful Inter-Cell Handover, Inter-BSC with Loss of MS

(Loss of HO CMD, T8>Trr7), FR Call (Trr7 Expiry)

BTSold BTSnewMS

CHNAK

Start T7

Stop T7

BSCnewBSCold MSC

DT1 (HO RQD)

CR (HO REQ)

DATRQ (HO CMD)

UI (MEAS REP)

SACCH

BWHCI

(with HO cause)

UI (MEAS REP)

SACCH

UI (MEAS REP)

SACCH

Start THORQST

Start TTRAU

Start T_MSRFPCI


ATTCHSEI (1.)

If last TCH start

AALTCHTI (1.)

Stop TTRAU (**)

CC (HO RAC; HO CMD)

DT1 (HO CMD)

Start T8

HO CMD islost ...

Start Trr7 (***)

Reset T8

DT1 (CL CMD)


Expiry Trr7

DT1 (CL CMP)

DT1 (CL CMD)

DT1 (CL CMP)

(cause: equipment

failure)

ATINBHDO (*)

I (HO CMD)

FACCH

CHNAV (New TCH)

Call in progress...


72/218

72 A30808-X3247-K41-4-7618



RLSD

RLC





(**)

DATRQ (CHREL)

DESAC

RELIN

RCHRA

RLSD

RCHRA

RLC


(***)


INDICATION.

(*)

RCHRL (New TCH)

RCHRL (Old TCH)

Reset T_MSRFPCI


73/218

A30808-X3247-K41-4-7618 73

InformationSystem


1.2.5.6 Unsuccessful Inter-Cell Handover, Inter-BSC, with Loss of MS,

Handover Access Failure (No SABM received after Transmission) of

PHYSICAL INFO, [(NY1+1) * T3105]


74/218

74 A30808-X3247-K41-4-7618



DT1 (HO DET)HANDO

UI (PHYS INFO)

Start T3105

FACCH

MS does not reactto PHYS INFO, noSABM is receivedat the BTS.

Expiry T3105UI (PHYS INFO)

Start T3105

FACCH

Expiry T3105UI (PHYS INFO)

Start T3105

FACCH

MS does not reactto PHYS INFO, no

SABM is receivedat the BTS.

Expiry T3105 (****)

CONFL

DT1 (CL REQ)

(cause: radiointerface

message failure)

DT1 (CL CMD)

MS does not reactto PHYS INFO, noSABM is receivedat the BTS.

(cause: handover

access failure)

DT1 (CL CMD)


75/218

A30808-X3247-K41-4-7618 75

InformationSystem




INDICATION.



(**)

(*)


RCHRL

RELIN

RCHRA

MTCHBUTI (1.)

(Stop)

AALTCHTI (1.)(Stop)

Expiry T8

NRFLTCH (9.)

DT1 (CL REQ)

(Cause: radio interface

message failure)

DT1 (CL CMD)

DT1 (CL CMP)

RLSD

RLC

DATRQ (CHREL)

DESAC

RELIN

RCHRA

RCHRL (Old TCH)

When T3105 has expired NY1+1 times, the BTS sends the CONNECTION FAILURE INDICATIONwith cause “handover access failure”.

(****)


76/218

76 A30808-X3247-K41-4-7618


1.2.5.7 Successful Inter-Cell Handover, Inter-BSC, No TCH Available

in First (external) Cell, Second Target Cell Belongs to

Originating BSC, FR Call

iThe red colour indicates the BSC serving the first (really external) target cell in the targetcell list of the HANDOVER REQUIRED message.

BTSold BSC BMS

CHNAK

BSC ABTSnew MSC

NRINHDFL

Start T7

DT1 (HO RQD)CR (HO REQ)

UI (MEAS REP)

SACCH

UI (MEAS REP)

SACCH

UI (MEAS REP)

SACCH

Start THORQST

ATTCHSEI (1.)

ATCHSMBS (1.)

CREF (HO FAI)

(cause: no radio

resource available)

CR (HO REQ)

CC (HO RAC; HO CMD)Start T_MSRFPCI

Stop TTRAU (**)

Stop T7

AOUINIRH (*)

AININIRH (*)

Start T8

Start TTRAU (**)

I (HO CMD)

FACCH

CHNAV (New TCH)

Call in progress...

(belongs to BSC A) (belongs to BSC A)

Start T3124

HANDOFACCH


ATTCHSEI (1.)if last TCH start

AALTCHTI (1.)

DT1 (HO CMD; HO CMD) (***)

DATRQ (HO CMD)

BWHCI

(with HO cause)

HO ACCESS


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ESTIN

DATIN (HO CMP)

MRPCI

DT1 (HO CMP)

DT1 (CL CMP)

SUCTCHSE (1.)

DT1 (CL CMD)


Stop T3105


INDICATION.


the BSC throughconnects the Asub-TCH to the Abis-TCH. In case of intra-BSC handover this is done


(**)

(*)

FACCH

FACCH

FACCH

FACCH

Stop T_MSRFPCI

Stop T8

(cause: handover

successful)

RCHRL (Old TCH)

BTSold BSC BMS BSC ABTSnew MSC(belongs to BSC A) (belongs to BSC A)

HANDOVER COMMAND contains the BCCH and BSIC frequency of an internal neighbour cell.(***

)

PHYS INFO

SABM

UA

I (HO CMP)

RELRQ

RELCN

RCHRA

MTCHBUTI (stop)

AALTCHTI (stop)

SOUINIRH (*)

SININIRH (*)

TNTCHCL (1.)


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1.2.5.8 Successful SDCCH-SDCCH Inter-Cell Handover, Inter-BSC

BTSold BTSnewMS

CHNAK

Start T7

Start T3124

HO ACCESS

DT1 (HO DET)

I (HO CMD)

HANDO

Stop T7

BSCnewBSCold MSC

ATINBHDO (*)

AOINTESH

DT1 (HO RQD)

CR (HO REQ)

DATRQ (HO CMD)

UI (MEAS REP)

SACCH

BWHCI

(with HO cause)

UI (MEAS REP)

SACCH

UI (MEAS REP)

SACCH

Start THORQST

Start T_MSRFPCI

NATTSDPE

If last SDCCH start

ASDCALTI

CC (HO RAC; HO CMD)


Start T8SDCCH

SDCCH

HO ACCESS

SDCCH

Start Trr7 (***)

CHNAV (New SDCCH)

UI (PHYS INFO)


SDCCH

Call in progress...

(channel type:

SDCCH)


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BTSold BTSnewMS

I (HO CMP)

DATIN (HO CMP)

MRPCI

DT1 (HO CMP)

RELRQ

DT1 (CL CMD)

Stop T8

SUINBHDO (*)

SOINTESH

BSCnewBSCold MSC

DT1 (CL CMP)RELCN

RCHRA

RLSD

NASUSDPE

ASDCALTI


INDICATION.

(*)

(cause: handover

successful)

SDCCH

Stop T_MSRFPCI

SABM

Stop T3105

ESTIN

UA

SDCCH

SDCCH


Stop Trr7 (***)

RLC

RCHRL (Old SDCCH)



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1.2.5.9 Unsuccsessful SDCCH-SDCCH Inter-Cell Handover, Inter-BSC,

No SDCCH Available in Target Cell

BTSold BTSnewMS

NRINHDFL

BSCnewBSCold MSC

NATTSDPE

ATSDCMBS

Start T7

DT1 (HO RQD)

CR (HO REQ)

UI (MEAS REP)

SACCH

BWHCI

(with HO cause)

UI (MEAS REP)

SACCH

UI (MEAS REP)

SACCH

Start THORQST

(cause: no radio

resource available)

CREF (HO FAI)

DT1 (HO RRJ)

Expiry T7

Call in progress...


(channel type:

SDCCH)

Note: If the handover condition persists and another INTERCELL HANDOVER CONDITION INDICATION

is received from the BTS after expiry of T7, the same procedure is repeated in exactly the same way.

NHOINRHA (2.)


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1.2.5.10 Unsuccessful SDCCH-SDCCH Inter-Cell Handover, Inter-BSC with

Loss of MS (Loss of HO CMD, T8


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BTSold BTSnewMS

DT1 (CL CMD)

BSCnewBSCold MSC

DT1 (CL CMP)

RLSD

RLC

ASDCALTI

DATRQ (CHREL)

DESAC

RELIN

RCHRA

Expiry Trr7 (***)

DT1 (CL CMD)

DT1 (CL CMP)

RLSD

RCHRA

RLC

(cause: equipment

failure)


(***)

Note: Subcounter dependson the handover cause value contained in the HANDOVER CONDITION

INDICATION.

(*)

RCHRL (New SDCCH)

RCHRL (Old SDCCH)

Reset T_MSRFPCI


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1.2.6 Intra-Cell Handover

1.2.6.1 Successful Intra-Cell Handover, FR Call

iNote: This message flow is valid for intra-cell handover due to quality,

intra-cell handover complete inner in concentric cells and

intra-cell handover far near in extended cells.

The difference just consists in the handover cause.

BTS BSCMS MSC

WIHCI

CHNAK

DATRQ (ASS CMD)I (ASS CMD)

SABM

Start T10

ESTIN


ATTCHSEI (1.)

If last TCH start

AALTCHTI (1.)

UA

TNTCHCL (1.)

Start TTRAU

UI (MEAS REP)SACCH

(with HO cause)

UI (MEAS REP)

SACCH

UI (MEAS REP)

SACCH

Start THORQST

Start T_MSRFPCI

Old FACCH

New FACCH

New FACCH

Stop TTRAU (**)

CHNAV (New TCH)

ATINHIAC (*)

SINTHITA (*)

SINHOBSC (*)

DATIN (ASS CMP)I (ASS CMP)

New FACCH

Call in progress...

Stop T10


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BTS BSCMS MSC



RELRQ

RELCN

RCHRA

SUCTCHSE (1.)

Note: Subcounter depends on the handover cause value contained in the HANDOVER CONDITIONINDICATION.

(*)

(with HO cause)

MRPCI

Stop T_MSRFPCI

TTRAU is stopped when the BTS receives the (idle) TRAU frames from the TRAU. This happens whentheBSC throughconnects the Asub-TCHto the Abis-TCH. In case of intra-cell handover this is done after

receipt of the ESTABLISH INDICATION for the target TCH.

(**)

DT1 (HOPER)

RCHRL (Old TCH)



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1.2.6.2 Unsuccessful Intra-Cell Handover Due to Quality, No TCH Available,

FR Call


WIHCI

ATTCHSEI (1.)

ATCHSMBS (1.)

NHOINRHA (4.)

ATTCHSEI (1.)(BTS new)

ATINHIRC (*)

If last TCH startAALTCHTI (1.)

BWHCI (**)

UI (MEAS REP)

SACCH

(cause:

downlink/uplink

quality)

UI (MEAS REP)

SACCH

UI (MEAS REP)

SACCH

(cause:

downlink/uplink

quality)


INDICATION.

(*)

Only for intra-cell handover due to quality. An inter-cell handover due to quality is triggered, if the

handover conditions persist and the call is still on the old TCH when the next HANDOVER CONDITIONINDICATION is sent after expiry of THORQST.

(**)

Start THORQST

Expiry THORQST

Call in progress...

Call continuation with inter-cell handover attempt...


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1.2.6.3 Unsuccessful Intra-Cell Handover Due to Quality with

Reversion to Old TCH, FR Call

BTS BSCMS MSC

WIHCI

CHNAK

DATRQ (ASS CMD)I (ASS CMD)

I (ASS FAIL)

Start T10

ESTIN


UNINHOIA (*)

Start TTRAU

UI (MEAS REP)

SACCH

(cause:

downlink/uplinkquality)

UI (MEAS REP)

SACCH

UI (MEAS REP)

SACCH

Start THORQST

Start T_MSRFPCI

(cause: protocol

error unspecified)

DATIN (ASS FAIL)

Stop T10

Old FACCH

Old FACCH

SABMOld FACCH

SABM

New FACCH

Access to targetchannel fails ...

UA

ATTCHSEI (1.)If last TCH start

AALTCHTI (1.)

ATINHIAC (*)

CHNAV (New TCH)

Reset TTRAU

Reset T_MSRFPCI

RCHRL (New TCH)

Call in progress...


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BTS BSCMS MSC

UI (MEAS REP)

SACCH

BWHCI (**)

(cause:

downlink/uplinkquality)

Only for intra-cell handover due to quality. An inter-cell handover due to quality is triggered, if thehandover conditions persist and the call is still on the

Documents

Messages Flow