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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

Gerte mssen die zutreffenden Sicherheitsbestimmungen erfllen.

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

knnen auch eine hohe Betriebstemperatur aufweisen.

Nichtbeachtung der Installations- und Sicherheitshinweise kann zu schweren Krperverletzungen oder

Sachschden fhren.

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 2006.

Issued by the Communications Group

Hofmannstrae 51

D-81359 Mnchen

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 8.0

Details:

Chapter / Section Reason for Update

all Revised chapters

Issue History

Issue Date of Issue Reason for Update

1 01/2005 First Edition for New Release BR 8.0

2 04/2005 Second Edition for Release BR 8.0

3 07/2005 Third Edition for Release BR 8.0

4 03/2006 Fourth Edition for Release BR 8.0


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This document consists of a total of 236 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 Call (MOC), FR Call . . . . . . . . . . . . . . . . . . 12

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

1.2.1.3 Successful Mobile Originating Call (MOC) with Direct Traffic Channel Assign-ment, FR Call . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18

1.2.1.4 Successful (MOC) Using Early Classmark Sending, FR Call . . . . . . . . . . 20

1.2.1.5 Successful Mobile Terminating Call (MTC), Using Early Classmark, Sending,FR Call . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 23

1.2.1.6 Successful Mobile Terminating Call (MTC) in busy mode, new waiting call(feature Call waiting) is accepted by called subscriber. . . . . . . . . . . . . . . 26

1.2.1.7 Unsuccessful Mobile Originating Call (MOC), Subscriber B Busy, FR Call 28

1.2.1.8 Unsuccessful Mobile Originating Call (MOC), No TCH Available, FR Call . 29

1.2.1.9 Successful Mobile Originated Call (MOC) in a Concentric Cell (inner area), FRCall . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 30

1.2.1.10 Successful Mobile Emergency Call (MEC), FR Call . . . . . . . . . . . . . . . . . . 32

1.2.2 Unsuccessful Assignment Procedures . . . . . . . . . . . . . . . . . . . . . . . . . . . . 33

1.2.2.1 Unsuccessful TCH Assignment Procedure with Reversion to SDCCH, FR Call33

1.2.2.2 Unsuccessful TCH Assignment Procedure with Loss of ASSIGNMENT COM-

MAND (T10 < T_MSRFPCI), FR Call (T10 Expiry). . . . . . . . . . . . . . . . . . . 341.2.2.3 Unsuccessful TCH Assignment Procedure with Loss of ASSIGNMENT COM-

MAND (T10 > T_MSRFPCI), FR Call (T_MSRFPCI Expiry). . . . . . . . . . . . 35

1.2.2.4 Unsuccessful TCH Assignment Procedure LAPDm I-Frame withASSIGNMENT COMMAND not acknowledged by MS (T200 Expiry), FR Call36

1.2.3 Call Release Procedures . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 37

1.2.3.1 Normal Call Release (Originated by MS), FR Call . . . . . . . . . . . . . . . . . . . 37

1.2.3.2 Normal Call Release (Originated by Network), FR Call . . . . . . . . . . . . . . . 38

1.2.3.3 Abnormal Call Release Procedure; Call drop: BTS sends CONNECTIONFAILURE INDICATION to the BSC. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 39

1.2.3.4 Abnormal Call Release Procedure; Call drop: BTS sends ERRORINDICATION to the BSC. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 42

1.2.3.5 Abnormal Call Release; BTS sends RELEASE INDICATION during a stablecall phase to the BSC, FR Call . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 44

1.2.4 Inter-Cell Handover, Intra-BSC . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 45

1.2.4.1 Successful Inter-Cell Handover, Intra-BSC, FR Call. . . . . . . . . . . . . . . . . . 45

1.2.4.2 Unsuccessful Inter-Cell Handover Attempt, Intra-BSC, No TCH Available inTarget Cell, FR Call . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 47

1.2.4.3 Unsuccessful Inter-Cell Handover, Intra-BSC, with Reversion to Old TCH(T3124 Expiry), FR Call . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 48

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


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1.2.4.5 Unsuccessful Inter-Cell Handover, Intra-BSC with Loss of MS (Loss of HOCMD, T8>TTRAU), FR Call (TTRAU Expiry) . . . . . . . . . . . . . . . . . . . . . . . . 52

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


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1.2.7.2 Unsuccessful Directed Retry, Intra-BSC, No Target Cell Available, FR Call .101

1.2.7.3 Unsuccessful Directed Retry, Intra-BSC, 1 Target Cell Available, Target CellCongested, FR Call. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 102

1.2.7.4 Unsuccessful Directed Retry, Intra-BSC, with Reversion to SDCCH, FR Call(T3124 Expiry) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 103

1.2.7.5 Unsuccessful Directed Retry, Intra-BSC, with Loss of MS (Loss of HO CMD,T8 < TTRAU), FR Call (T8 Expiry) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 105

1.2.7.6 Unsuccessful Directed Retry, Intra-BSC, with Loss of MS (Loss of HO CMD,T8 > TTRAU), FR Call (TTRAU Expiry) . . . . . . . . . . . . . . . . . . . . . . . . . . 107

1.2.8 Directed Retry, Inter-BSC . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 109

1.2.8.1 Successful Directed Retry, Inter-BSC, FR Call. . . . . . . . . . . . . . . . . . . . . 109

1.2.8.2 Unsuccessful Directed Retry, Inter-BSC, FR Call, no Radio Resource avail-able in Target Cell . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 112

1.2.8.3 Unsuccessful Directed Retry, Inter-BSC, with Reversion to SDCCH, FR Call

(T3124 Expiry) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1131.2.8.4 Unsuccessful Derected Entry, Inter-BSC, with Loss of MS (Loss of HO CMD,

T8 < Trr7), FR Call (T8 Expiry) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 116

1.2.8.5 Unsuccessful Directed Retry, Inter-BSC, with Loss of MS (Loss of HO CMD,T8 > Trr7), FR Call (Trr7 Expiry) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 118

1.2.9 Forced Handover Due to O & M . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 120

1.2.9.1 Successful Forced Handover Due to O & M. . . . . . . . . . . . . . . . . . . . . . . 120

1.2.9.2 Successful Forced Handover Due to O & M, Inter-BSC, FR Call . . . . . . . 122

1.2.9.3 Successful Forced Intra-Cell Handover Due to O & M, FR Call . . . . . . . . 124

1.2.10 Handover due to BSS Resource Management Criteria (Traffic Handover) 125

1.2.10.1 Successful Handover due to BSS Resource Management Criteria (Traffic

Handover), FR Call . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1251.2.10.2 Unsuccessful Inter-Cell Handover due to BSSResource Management Criteria

(Traffic Handover), traffic load in Target Cell exceeds the threshold TRFLTH128

1.2.11 Queuing & Preemption . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 130

1.2.11.1 Queuing: Queued Assignment Request for FR TCH Is Served BeforeT11PUB or T11WPS Expiry, Directed Retry Enabled But No Target Cell Avail-able, Preemption Disabled or Not Allowed for the Requesting Call . . . . . 130

1.2.11.2 Queuing: Queued Assignment Request for FR TCH is Discarded from theQueue Before T11PUB or T11WPS 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 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 132

1.2.11.3 Queuing: Queued Assignment Request for FR TCH Is Discarded from QueueDue to T11PUB or T11WPS Expiry, Directed Retry Enabled But No TargetCell Available, Preemption Disabled or Not Allowed for the Requesting Call .134

1.2.11.4 Queuing: Queued Handover Request for FR TCH Is Served Before TQHO-PUB or TQHOWPS Expiry, Preemption Disabled or Not Allowed for theRequesting Call. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 135

1.2.11.5 Queuing: Queued Handover Request for FR TCH Is Discarded from theQueue Before TQHOPUB or TQHOWPS Expiry Due to an Incoming FR Callwith Higher Priority, Preemption Disabled or Not Allowed for the RequestingCalls . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 137


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1.2.11.6 Queuing: Queued Handover Request for FR TCH Is Discarded from theQueue Due to TQHOPUB or TQHOWPS Expiry, Preemption Disabled or NotAllowed for the Requesting Calls . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 139

1.2.11.7 Preemption: Successful Forced Inter-Cell Handover Due to Preemption, Pre-empted Assignment Request and Preempting Call Are Both FR. . . . . . . . 140

1.2.11.8 Preemption: Forced Release of Preempted Call Due to Lack of Target Cell forForced Inter-Cell Handover Procedure, Preempted and Preempting Call AreBoth FR . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 142

1.2.11.9 Preemption: Successful Forced Inter-BSC Handover Due to Preemption, Pre-empting Handover Request and Preempted Call Are Both FR, OriginatingBSC of the Preempting Handover Request and Target BSC for the ForcedHandover Are the Same. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 143

1.2.12 HSCSD. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 145

1.2.12.1 Successful HSCSD Call, Mobile Originating, 3 TCHs Used . . . . . . . . . . . 145

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

1481.2.12.3 Forced Intra-cell Handover During HSCSD Assignment Procedure . . . . . 151

1.2.13 Signalling Transactions without TCH . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 153

1.2.13.1 Successful Location Update (Phase 2 MS) . . . . . . . . . . . . . . . . . . . . . . . . 153

1.2.13.2 Successful Location Update (2G/3G (GSM/UMTS) Multirat MS) . . . . . . . 155

1.2.13.3 Successful IMSI Detach (Phase 2 MS) . . . . . . . . . . . . . . . . . . . . . . . . . . . 157

1.2.13.4 Successful Supplementary Service (SS) Management Procedure via Sub-scriber-Controlled Input (SCI) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 158

1.2.13.5 Successful USSD (Unstructured Supplementary Service Data) ManagementProcedure via (SCI) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 160

1.2.13.6 Unsuccessful Immediate Assignment Procedure, No SDCCH Available. . 162

1.2.13.7 Unsuccessful Immediate Assignment Procedure with DELETE INDICATION(no AGCH available or AGCH message timeout) . . . . . . . . . . . . . . . . . . . 163

1.2.13.8 Unsuccessful Immediate Assignment Procedure, assigned SDCCH is notseized by the MS (Phantom RACH Scenario) . . . . . . . . . . . . . . . . . . . . . . 164

1.2.13.9 BTS Discards Invalid RACH Messages . . . . . . . . . . . . . . . . . . . . . . . . . . . 165

1.2.13.10Immediate Assignment Procedure for Abis Link Configured via Satellite Link.166

1.2.13.11Paging Overload - BTS discards a PAGING REQUEST Message . . . . . . 167

1.2.14 Short Message Service . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 168

1.2.14.1 Successful SMS Mobile Originating in Idle Mode (Phase 2 MS) . . . . . . . . 168

1.2.14.2 Successful SMS Mobile Terminating in Idle Mode (Phase 2 MS) . . . . . . . 170

1.2.14.3 Successful SMS Mobile Originating in Connected Mode (FR Call Ongoing). .172

1.2.14.4 Successful SMS Mobile Terminating in Connected Mode . . . . . . . . . . . . . 173

1.2.15 Advanced Speech Call Items (ASCI) Procedures . . . . . . . . . . . . . . . . . . . 174

1.2.15.1 VBS/VGCS Setup Initiated by fixed Dispatcher and Release . . . . . . . . . . 174

1.2.15.2 Succesful Uplink Allocation Procedure (1). . . . . . . . . . . . . . . . . . . . . . . . . 176

1.2.15.3 FREE Uplink Procedure . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 178

1.2.15.4 VGCS Setup initiated by Service Subscriber and Release . . . . . . . . . . . . 179

1.2.15.5 VGCS SETUP initiated by Service Subscriber (FAST CALL SETUP) . . . . 182

1.2.15.6 MTC During Ongoing VBS/VGCS Connection. . . . . . . . . . . . . . . . . . . . . . 183

1.2.15.7 VBS/VGCS Call during Ongoing Speech Call . . . . . . . . . . . . . . . . . . . . . . 184

1.2.16 Inter System Handover (2G 3G), circuit switched (CS) . . . . . . . . . . . 185


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1.2.16.1 Successful Inter System Handover (2G --> 3G) . . . . . . . . . . . . . . . . . . . 185

1.2.16.2 Unsuccessful Inter System Handover (2G --> 3G),loss of MS (loss of HOCMD), T3121 expiry . . . . . . . . . . . . . . . . . . . . . . . 187

1.2.16.3 Unsuccessful Inter System Handover (2G --> 3G),No TCH available in Target UMTS Cell (3G) . . . . . . . . . . . . . . . . . . . . . . 189

1.2.16.4 Unsuccessful Inter System Handover (2G --> 3G), Reversion to old TCH,T3124 expiry . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 190

1.2.16.5 Successful Inter System Handover (3G --> 2G) . . . . . . . . . . . . . . . . . . . 191

1.2.16.6 Unsuccessful Inter System Handover (3G --> 2G), No TCH available in TargetGSM Cell (2G) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 193

1.2.17 Other Procedures . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 194

1.2.17.1 Idle Traffic Channel Supervision. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 194

1.2.17.2 Uplink and Downlink Measurement Reports on Abis . . . . . . . . . . . . . . . . 195

1.2.17.3 IMSI Trace Invocation for Normal Call Setup . . . . . . . . . . . . . . . . . . . . . . 196

1.2.17.4 IMSI Trace Invocation for Incoming Inter-BSC Handover. . . . . . . . . . . . . 197

1.3 GPRS Message Flows . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 198

1.3.1 GPRS Procedures . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 198

1.3.1.1 GPRS Mobility Management: Attach Procedure. . . . . . . . . . . . . . . . . . . . 198

1.3.1.2 GPRS Mobility Management: Detach Procedure . . . . . . . . . . . . . . . . . . . 199

1.3.1.3 GPRS Session Management: Activate PDP Context . . . . . . . . . . . . . . . . 200

1.3.1.4 GPRS Session Management: Deactivate PDP Context . . . . . . . . . . . . . . 201

1.3.1.5 GPRS: Paging. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 201

1.3.1.6 GPRS Mobility Management: Routing Area Update . . . . . . . . . . . . . . . . . 202

1.3.1.7 GPRS Mobility Management: Cell Update . . . . . . . . . . . . . . . . . . . . . . . . 204

1.3.1.8 GPRS: Suspend / Resume . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 205

1.3.2 Inter System Cell Reselection Procedure (2G 3G), packet oriented (PO),intra SGSN inter system change. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 207

1.3.2.1 Successful Inter System Cell Reselection Procedure (2G --> 3G) . . . . . . 207

1.3.2.2 Successful Inter System Cell Reselection Procedure (3G --> 2G) . . . . . . 210

1.3.3 RLC/MAC Message Flows . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 213

1.3.3.1 Uplink TBF . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 214

1.3.3.2 Downlink TBF . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 218

1.3.3.3 Concurrent UL TBF. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 221

1.3.3.4 Concurrent DL TBF. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 224

2 Counter / Message Abbreviations. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 229

3 Abbreviations . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 235


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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, 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 Abbreviations.

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 affectedsignalling 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 Sendingand 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 call.In 1.2.11.7, 1.2.11.8 and 1.2.11.9 the blue colour indicates the events related to pre-empting call.In 1.2.5.7 the red colour indicates the BSC serving the first (really external) target cell inthe target cell list of the HANDOVER REQUIRED message.

iSMLC-Specific Message Flows:In order to guarantee an SBS release-independent documenation delivery, the SMLC-related message flows are provided in a separate documentation set. The manualPM:SBS Message Flows is intended for the SBS-specific message flows, whereas themanual PM:SMLC Message Flows is intended for the SMLC-specific message flows.Both manuals may be used together, if applicable.


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1.2 Message Flows

1.2.1 Call Setup Procedures

1.2.1.1 Successful Mobile Originating Call (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

Stop T3101

Stop T_MSRFPCI

Stop T3101

NTDMAGCH (1.)

CHALNHLY [19]

If layer is not the pre-

ferred oneCHALNHLY [1]

MBUSYSD (+)


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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

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)

MBUSYSSP (1.) (accumulation)MBUSYSD (-)

RELRQ

Start T10

Stop T10

CHALNHLY[20

(Full V1/V2) or

21(AMR)]


ferred oneCHALNHLY[2 or 3]

MEBUSTCH [1]

MEBUTSLY [FR & LY]

MBTCHCHT 1 if FV1, 2 if FV2, 3 if FV3

ABISPDIS [1], ABISPSUP [6]

If last abis, start ABISPSUP [5]

TNTCHCL (1.)

SUCTCHSE (1.)

TASSSUCC (2.)


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14 A30808-X3247-M41-4-7618


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.

(**)

called party isreachableandidle (ringing)

called party hasaccepted the call


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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.)

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

Stop T3101

MRPCI

Stop T_MSRFPCI

DT1 (TRCMD)

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

NTDMPCH (1.)

NTDMAGCH (1.)

NATTSDPE

NACSUCPR (1.), (3.)

ATIMASCA (1.)

If last SDCCH start

ASDCALTI

CHALNHLY [19]

If layer is not the

preferred one

CHALNHLY [1]

MBUSYSD (+)


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16 A30808-X3247-M41-4-7618


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)

SABM

ESTIN

DATIN (ASS CMP)

Start TTRAU

Start T_MSRFPCI

Stop TTRAU (**)

SDCCH

FACCH

DT1 (ASS COM)

TNTCHCL (1.)

SUCTCHSE (1.)

TASSSUCC (2.)

I (ASS CMP)

FACCH

UA

FACCH

MRPCI

Stop T_MSRFPCI


Start T10

Stop T10

RELRQ

RCHRL (SDCCH)

RCHRA

RELCN

ASDCALTI

(stop)

MBUSYSSP (1.) (accumulation)

MBUSYSD (-)

CHALNHLY[20 (Full

V1/V2) or 21(AMR)]

If layer is not the preferred

one

CHALNHLY[2 or 3]t

MEBUSTCH [1]

MEBUTSLY [FR & LY]





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BTS BSCMS MSC

I (CONACK)

DT1 (ALERT)

I (ALERT)DATIN (ALERT)

DATRQ (CONACK)DT1 (CONACK)

DT1 (CONNECT)DATIN (CONNECT)

I (CONNECT)

FACCH

FACCH

FACCH


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 TCH Assignment this is done ontransmission of the ASSIGNMENT COMMAND.

(**)

called MS isready (ringing)

called MS hasaccepted the call


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18 A30808-X3247-M41-4-7618


1.2.1.3 Successful Mobile Originating Call (MOC) with Direct Traffic

Channel Assignment, FR Call

BTS BSCMS MSC

CHNAV (TCH)

CHNAK

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

Stop T3101

NTDMAGCH (1.)


If last abis, start ABISPSUP [5] MEBUSTCH-1

MEBUSTLY

ATTCHSEI (1.)

ATIMASCA (4.)

NASCUCPR (3.)

If last TCH start

AALTCHTI (1.)


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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)

DT1 (CONNECT)DATRQ (CONNECT)

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 internal

timers 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.

(***)



MBTCHCHT

CHALNHLY[20 (Full

V1/V2) or 21(AMR)]


ferred one also

CHALNHLY [2 or 3]

(***)


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20 A30808-X3247-M41-4-7618


1.2.1.4 Successful (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

Stop T3101

Stop T_MSRFPCI

Start T_MSRFPCI

MRPCI

DATRQ (TRCMD)

NTDMAGCH (1.)

CHALNHLY [19]


ferred one

CHALNHLY [1]

MBUSYSD (+)


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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

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.)


Start T10

Stop T10

RELRQ

RELCN

RCHRL (SDCCH)

RCHRA

TNTCHCL (1.)

SUCTCHSE (1.)

TASSSUCC (2.)

ASDCALTI

(stop)


MBUSYSD (-)

CHALNHLY[20 (Full V1/V2)

or 21(AMR)]


one

CHALNHLY[2 or 3]

MEBUSTCH [1]

MEBUTSLY [FR & LY]





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22 A30808-X3247-M41-4-7618


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

CHNREQRACH

DT1 (CICMP)

Start T_MSRFPCI

Start T3101

Stop T3101

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)

NTDMAGCH (1.)

CHALNHLY [19]


ferred one

CHALNHLY [1]

MBUSYSD (+)


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24 A30808-X3247-M41-4-7618


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 (**)

SDCCH

FACCH

DT1 (ASS COM)

I (ASS CMP)

FACCH

UA

FACCH

MRPCI

Stop T_MSRFPCI


Start T10

Stop T10

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)

TNTCHCL (1.)

SUCTCHSE (1.)

TASSSUCC (2.)

CHALNHLY[20 (Full

V1/V2) or 21(AMR)]


one

CHALNHLY[2 or 3]

MEBUSTCH [1]

MEBUTSLY [FR & LY]





25/236

A30808-X3247-M41-4-7618 25

InformationSystem


FACCH

I (ALERT)

BSCMS BTS MSC

DATRO (ALERT)DT1 (ALERT)

Call setup continuation...



(**)

RELRQ

RCHRL (SDCCH)

RCHRA

RELCN

ASDCALTI

(stop)


MBUSYSD (-)


26/236

26 A30808-X3247-M41-4-7618


1.2.1.6 Successful Mobile Terminating Call (MTC) in busy mode, new wait-

ing call (feature Call waiting) is accepted by called subscriber

called subscriber acceptsnew cell and releases theold one by the pressingthe appropriate keys onthe MS

DATIN (SPDACK)

DATIN (STDACK)

DATRQ (SPDTMF)

DATRQ (STDTMF) DT1 (STDTMF)

DT1 (STDACK)

DT1 (SPDTMF)

DT1 (SPDACK)

FACCH

BTS MSCMS BSC

(cause: user busy

I (SPDACK) FACCH

I (SPDTMF)

I (STDACK)

FACCH

I (STDTMF)FACCH

SDCCH

SDCCH

new call for a busysubscriber arrives atMS

DT1 (ALERT)

DATIN (SETUP)

DATRQ (CONNECT)

I (ALERT)


DATRQ (ALERT)

DATIN (CONACK) DT1 (CONACK)

FACCH

I (CONNECT)

FACCH

FACCH

DATRQ (ALERT)*

FACCH


I (ALERT)*

I (CCONF)*

I SETUP)*DT1 (SETUP)*

DT1 (ALERT)*

DT1 (CCONF)*

I (CONACK)

DT1 (CONNECT)

DATRQ (CCONF)*



27/236

A30808-X3247-M41-4-7618 27

InformationSystem


BTS BSCMS MSC

I (DISC)FACCH (cause: normal call clearing)

I (RELEAS)

FACCH

I (RELCMP)

FACCH

I (CONNECT)*FACCH

I (CONACK)*

FACCH

DATIN (DISC)

DATIN (RELEAS)

DATIN (REL CMP)

DATIN (CONNECT)*

DATIN (CONACK)*

DT1 (DISC)

DT1 (RELEAS)

DT1 (REL CMP)

DT1 (CONNECT)*

DT1 (CONACK)*

(cause: normal call clearing)

Conversation phase of new accepted call...

Messages related to new waiting and accepted call.(*)


28/236

28 A30808-X3247-M41-4-7618


1.2.1.7 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)

RCHRA

(cause: user busy)

FACCH

I (DISC)

SDCCH

DATRQ (DISC)

Stop T_MSRFPCI

Stop T10

ASDCALTI

(stop)

MBUSYSSP (1.)

(accumulation)


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InformationSystem


1.2.1.8 Unsuccessful Mobile Originating Call (MOC), No TCH Available, FR

Call

BTS BSCMS MSC

I (SETUP)DATIN (SETUP)

TASSFAIL (8.)

ATTCHSEI (1.)

ATCHSMBS (1.)

ABISPSUP (7.)

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: no circuit/channel available)I (DISC)

FACCH

DATRQ (DISC)

SDCCH

SDCCH

Call setup ...


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1.2.1.9 Successful Mobile Originated Call (MOC) in a Concentric Cell (inner

area), FR Call

BTS BSCMS MSC

I (CPROC)DATRQ (CPROC)


ATTCHSEI (1.)

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

ESTIN

DT1 (ASS COM)

Start T10

Stop T10

TASSATT (2.)

MEBUSTCH [1]

MEBUTSLY [FR & LY]

MBTCHCHT 1 if FV1, 2 if

FV2, 3 if FV3

ABISPDIS [1], ABISPSUP

[6]

TNTCHCL (1.)

SUCTCHSE (1.)

TASSSUCC (2.)


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InformationSystem


BTS BSCMS MSC

RELCN

ASCALTI (stop)MBUSYSSP(1.)

(accumulation)

DT1 (ALERT)

MRPCI

RELRQ

RCHRL (SDCCH)

RCHRA

Call setup continuation ...



(**)

Stop T_MSRFPCI

DATRQ (ALERT)I (ALERT)

FACCH


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32 A30808-X3247-M41-4-7618


1.2.1.10 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

Stop T3101

NTDMAGCH (1.)

CHALNHLY [19]


ferred one

CHALNHLY [1]

MBUSYSD (+)


or 21(AMR)]


one

CHALNHLY[2 or 3]

MEBUSTCH [1]

MEBUTSLY [FR & LY]





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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 FAIL)

TASSFAIL (7.)

PHCCN

CHNAV (TCH)

CHNAK

DATRQ (ASS CMD)

I (ASS CMD)

(cause: radio interface failure,

DT1 (DISC)

Call setup ...

SDCCH

Start TTRAU


(cause: normal, unspecified)

I (ASS FAIL)SDCCH

FACCH

SABM

ESTIN sdcch

PHCRQ

ATTCHSEI (1.)

TASSATT (2.)

If last TCH start

AALTCHTI

Access to targetchannel fails...

SABMSDCCH

UA

(Cause: protocolerror unspecified)

DATIN (ASS FAIL)

reversion to old channel)

Start T10

Stop T10

Call release ...

DATRQ (DISC)I (DISC)

SDCCH

FACCH

SABM

FACCH

SABM

....

SDCCH

CHALNHLYCHALNHLY[20

(Full V1/V2) or 21(AMR)]


one

CHALNHLY[2 or 3]

MEBUSTCH [1]

MEBUTSLY [FR & LY]





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34 A30808-X3247-M41-4-7618


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 ...


or 21(AMR)]


one

CHALNHLY[2 or 3]

NRCLRCHD [14]

MEBUSTCH [1]

MEBUTSLY [FR & LY]





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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 when


NRCLRREQ [2]

NRCLRCMD [1]


36/236

36 A30808-X3247-M41-4-7618


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 expired

N200+1 times))



(**)

NRFLSDCC (1.)

I (ASS CMD)

I (ASS CMD)

I (ASS CMD)

SDCCH

SDCCH

SDCCH

T200 expired

N200+1 times))

T200

T200

T200

NRCLRCMD (13)

NRCLRREQ (1S)


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A30808-X3247-M41-4-7618 37

InformationSystem


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)

AALTCHTI (1.) (stop,

if previously started)

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: end user originated)

Start T3110

Stop T3110

Start T3109

Stop T3109

Start T3111

Expiry T3111

NRCLRCMD (2.)

MBTCHCH

MEBUSTCH =

MEBUTSLY -

ABSPDIS -


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38 A30808-X3247-M41-4-7618


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

BTS BSCMS MSC

I (DISC)

DATRQ (RELEAS)

DATIN (REL CMP)

MTCHBUTI (1.) (stop)AALTCHTI (1.) (stop,


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

DISCFACCH

UA

FACCH



(cause: end user originated)


Start T3110

Stop T3110

Start T3109

Stop T3109

Start T3111

Expiry T3111

NRCLRCMD (2.)

MBTCHCH

MEBUSTCH =

MEBUTSLY -

ABSPDIS -


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A30808-X3247-M41-4-7618 39

InformationSystem


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/TSYNCDL**** 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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40 A30808-X3247-M41-4-7618


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) or SDCCH

MS-BTS distanceexceeds the thresholdEXCDIST

CONFL

(cause: distance limit exceeded******)

NRFLTCH (5.)

or *

NRFLSDCC (5.)

or...

NRCLRCMD (1.)

NRCLRREQ (3.)

or

NRCLRREQ (6.)******

If TCH



if previously started)MBTCHCH

MEBUSTCH =

MEBUTSLY -

ABSPDIS -

If SDCCH

MBUSYSDC -

ASDCALTI (stop, if

previously started)

A

B


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A30808-X3247-M41-4-7618 41

InformationSystem


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

RDLNKTBS is the initial value of the 'S' Counter. This counter in the BTS is decreased by '1' if the BTScannot decode a SACCH frame correctly. When the BTs can decode a SACCH frame again,RDLNKTBS is increased by '2'. If the counter reaches '0', the Um connection is regarded as lost.

TTRAU is started in the BTS on receipt of the CHANNEL ACTIVATION message for a TCH. Its purposeis to observe the receipt of TRAU frames from the TRAU after the activation of the TCH, i.e. it is stoppedwhen TRAU frames are received.

TSYNC is started in the BTS when the BTS does not receive valid TRAU frames for an activated TCHanymore. Its purpose is to observe the re-appearance of TRAU frames from the TRAU, i.e. it is stoppedagain when TRAU frames are received. TSYNC is used for FR, HR and EFR speech calls and forstandard dataservices (up to 9,6 kbit/s). For AMR calls and 14,4 kbit/s dataservices TSYNC is replacedby TSYNCDL.

T_MSRFPCI is started in the BTS on receipt of the CHANNEL ACTIVATION ACKNOWLEDGEmessage for a TCH. Its purpose is to observe the receipt of the MPRCI message, i.e. it is stopped whenthe MRPCI message is received. The BSC sends this message when the MS has successfully sent thefirst layer 3 message on a new channel during call setup (CM SERVICE REQUEST (for the SDCCH)and ASSIGNMENT COMPLETE) and handover (ASSIGNMENT COMPLETE (intracell HO) andHANDOVER COMPLETE (inter-cell handover)). As T_MSRFPCI is hardcoded to a very long value(20s), this timer should never expire under normal conditions and reasonable timer settings.

When the BSC receives a CONNECTION FAILURE INDICATION with cause distance limit exceeded,the cause value contained in the CLEAR REQUEST message will not be radio interface message

failure but distance. Consequently also the corresponding NRCLRREQ subcounter (6.) is triggeredinstead of subcounter (3.).

If the CONN_FAIL is received on TCH, the corresponding subcounter is NRCLRREQ 3 or 6 (see noteabove); on the contrary if it is received on SDCCH, the corresponding subcounter is NRCLRREQ 21 or24.

NRCLRCMD (1) if CONN_FAIL is received on TCHNRCLRCMD (13) if CONN_FAIL is received on SDCCH

(*)

(***)

(****)

(*****)

(**)

(******)

A

B


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42 A30808-X3247-M41-4-7618


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 modeN200+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 (Mode) to the BTS whilethe BTS-MS communication is inmultiple frame stablished state

ERRIN

(cause: unsolicited DM response,

multiple frame established state)

DMFACCH or SDCCH

or...

RELIN**

RELIN**


43/236

A30808-X3247-M41-4-7618 43

InformationSystem


BTS BSCMS MSC

DT1 (CL REQ)

RCHRA

DT1 (CL CMD)


DT1 (CL CMP)

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 inacknowledged mode

or...

NRCLRCMD (1.)

NRCLRREQ (3.)

RELIN**

The RELEASE INDICATION is always sent directly after the ERROR INDICATION to indicate that thelayer 2 context on the Um interface has already been cleared by the BTS.

(**)

3 if TCH21 if SDCCH

13 if SDCCH1 if TCH

If TCH




MBTCHCH

MEBUSTCH =

MEBUTSLY -

ABSPDIS -

If SDCCH

MBUSYSDC -

ASDCALTI (stop, if

previously started)


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44 A30808-X3247-M41-4-7618


1.2.3.5 Abnormal Call Release; BTS sends RELEASE INDICATION during a

stable call phase to the BSC, FR Call

BTS BSCMS MSC

DT1 (CL REQ)

DT1 (CL CMD)

(cause: radio

interface failure)

RELIN

Due to MS-internalirregularities, the MSdisconnects the layer 2on the Um interface.

Call or dedicated TCH connection in a stable phase...

NRCLRCMD (1.)

NRCLRREQ (2.)

DISC

RELCN

RCHRA

RELRQ

Reset T_MSRFPCI

RCHRL (New TCH)




MBTCHCH

MEBUSTCH =

MEBUTSLY -

ABSPDIS -


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A30808-X3247-M41-4-7618 45

InformationSystem


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.)

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 (new TCH)

SABM

UA

FACCH

FACCH

TNTCHCL (1.)

Call in progress...

CHALNHLY[20 (Full

V1/V2) or 21(AMR)]


ferred one

CHALNHLY[2 or 3]

MEBUSTCH [1]

MEBUTSLY [FR & LY]


ATINHIRC (*)


46/236

46 A30808-X3247-M41-4-7618



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 ...




MBTCHCH

MEBUSTCH =

MEBUTSLY -

ABSPDIS -

HO ACCESS is transmitted exactly 4 times, the MS does not wait for any response from the BTS but

directly sets up the layer 2 connection (using the SABM) after the last HO ACCESS.

(***)


47/236

A30808-X3247-M41-4-7618 47

InformationSystem


1.2.4.2 Unsuccessful Inter-Cell Handover Attempt, Intra-BSC, No TCH

Available in Target Cell, FR Call


......

......

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.

When the BSC receives an INTERCELL HANDOVER CONDITION INDICATION for a TCH with a valid

target cell, it first checks the administrative state (locked/unlocked/shutting down) and the availability

state (enabled/disabled) of the target BTS objects. Moreover, if the INTERCELL HANDOVER CON-

DITION INDICATION contains the cause "traffic", it checks the TCH load situation with respect to the

threshold TRFLTH.Only if the BSC finds one target BTS in state "unlocked/enabled" and (in case of traffic handover)

with a TCH load below the TRFLTH threshold, the BSC star ts to search for an available TCH in the

"idle list" of the target cell. Only in this case the measurements ATINHIRC (for the originating BTS)

and ATTCHSEI (for the target BTS) are triggered. If no TCH can be found due to TCH congestion,

"locked" state of the TRXs or/and "locked" state of the CHAN objects in the target BTS, ATCHSMBS

is triggered for the target BTS in addition and the next target cell is analyzed.If no target BTS in state "unlocked/enabled" or (in case of traffic handover) no target cell with the TCH

load below the threshold TRFLTH can be found, NHOINRHA is triggered. In this case neither ATIN-

HIRC nor ATTCHSEI nor ATCHSMBS are increased.

Also CHALHNLY is triggered: 20 [if full V1/V2] and 11. Also 21 [if AMR] and 12.

(*)

BWHCI

(with HO cause)

ATTCHSEI (1.)(**)(***)

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

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

BWHCI

(with HO cause)

Start THORQST

Expiry THORQST

Call in progress...


(**)

ATTCHSEI (1.)(**)(***)

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

ATINHIRC (*)(**)(***)

NHOINRHA (3.)(**)

(***)


48/236

48 A30808-X3247-M41-4-7618


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

UA

FACCH

FACCH

ESTIN [old TCH]

HO ACCESS

FACCH

Stop T8

HOFITABS

UNINHOIE (*)

I (HO FAIL)

FACCH DATIN (HO FAIL)

(cause: protocol error, unspecified**)

Call in progress...

CHALNHLY[20

(Full V1/V2) or21(AMR)]

If layer is not the

preferred one

CHALNHLY[2 or

3]

MEBUSTCH [1]

MEBUTSLY [FR & LY]

MBTCHCHT 1 if FV1, 2 if FV2, 3 if

FV3




49/236

A30808-X3247-M41-4-7618 49

InformationSystem



RCHRL (New TCH)


AALTCHTI (1.) (stop)


INDICATION.

(*)

Reset T_MSRFPCI

RCHRA

Reset TTRAU


(**) The actual cause value used by the MS might differ from the one indicated in the message flow -other cause values such as "abnormal release, timer expired" or "abnormal release, unspecified" etc.might be used.

The handover might not only fail due to the fact that no PHYSICAL INFORMATION is received aftertransmission of the HANDOVER ACCESS on the target channel. The MS can still return to the oldchannel after it has received the PHYSICAL INFORMATION from the BTS. This happens when thelayer 2 connection setup fails, i.e. when the MS does not receive any UA after repeated transmissionof the SABM on the target channel.

(****)

MBTCHCH

MEBUSTCH =

MEBUTSLY -

ABSPDIS -


50/236

50 A30808-X3247-M41-4-7618


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

of HO CMD, T8


51/236

A30808-X3247-M41-4-7618 51

InformationSystem






INDICATION.

(*)

Reset T_MSRFPCI

Reset TTRAU

RCHRA

RLSD

RCHRL (New TCH)

RLC

Call release ...

MBTCHCH

MEBUSTCH =

MEBUTSLY -

ABSPDIS -

A

Note: These subcounters are triggered both for the new and old channel's release.A


52/236

52 A30808-X3247-M41-4-7618


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 (*)


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...

NRCLRCMD (1.)

NRCLRREQ (3.)

CHALNHLY[20

(Full V1/V2) or

21(AMR)]

If layer is not the

preferred one

CHALNHLY[2 or

3]

MEBUSTCH [1]

MEBUTSLY [FR & LY]

MBTCHCHT 1 if FV1, 2 if FV2, 3 if

FV3




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A30808-X3247-M41-4-7618 53

InformationSystem






INDICATION.

(*)

RELRQ

RELCN

RCHRA

RCHRL (New TCH)

RCHRL (Old TCH)

RCHRA

RLSD

RLC

Reset T_MSRFPCI

MBTCHCH

MEBUSTCH =

MEBUTSLY -

ABSPDIS -

A



54/236

54 A30808-X3247-M41-4-7618


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]


55/236

A30808-X3247-M41-4-7618 55

InformationSystem




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.(***)

MSdoesnotreacttoPHYSINFO, noSABM is receivedat the BTS.

Expiry T3105 (***)

Expiry T3105

NRCLRCMD (1.)

NRCLRREQ (3.)



MBTCHCHMEBUSTCH =

MEBUTSLY -

ABSPDIS -


A


56/236

56 A30808-X3247-M41-4-7618


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


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 new TCH

TNTCHCL (1. for

concentric cells)

SABM

UA

FACCH

FACCH

Call in progress...

PAREA

PAREQ

CHALNHLY[20

(Full V1/V2) or

21(AMR)]

If layer is not thepreferred one

CHALNHLY[2 or

3]

MEBUSTCH [1]

MEBUTSLY [FR & LY]MBTCHCHT 1 if FV1, 2 if FV2, 3 if

FV3




57/236

A30808-X3247-M41-4-7618 57

InformationSystem



MRPCI

Stop T8

DATIN (HO CMP)

SUCTCHSE (1.)

DT1 (HOPER)

SINTHINT (*)

SININIRH (*)

SOUINIRH (*)

SINHOBSC (*)

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

INDICATION.



(**)

(*)


RELRQ

RELCN

RCHRL (Old TCH)

RCHRA

I (HO CMP)

FACCH




MBTCHCH

MEBUSTCH =

MEBUTSLY -

ABSPDIS -


58/236

58 A30808-X3247-M41-4-7618


1.2.4.8 Successful Inter-Cell Handover, Intra-BTSE, Between Synchronized

Cells, FR Call


CHNAK

CHNAV (New TCH)

I (HO CMD)

MTCHBUTI (1.)

(start)

Start T8

AININIRH (*)

AOUINIRH (*)

HANDO

Start THORQST

Start TTRAU

Stop 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

(Activation type: related to

synchronous handover)

(Synchronization Indicator: synchronized)

HO ACCESS (***)

FACCH

HO ACCESS (***)

FACCH

ESTIN (new TCH)SABM

UAFACCH

FACCH TNTCHCL (1.)

Stop T8

DATIN (HO CMP)

SINTHINT (*)

SININIRH (*)

SOUINIRH (*)

SINHOBSC (*)

I (HO CMP)

FACCH

Call in progress...

CHALNHLY[20 (Full

V1/V2) or 21(AMR)]


ferred one

CHALNHLY[2 or 3]

MEBUSTCH [1]

MEBUTSLY [FR & LY]


ATINHIRC (*)

ATTCHSEI (1.)

If last TCH start

AALTCHTI (1.)


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InformationSystem



MRPCI

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.

(***)




MBTCHCH

MEBUSTCH =

MEBUTSLY -

ABSPDIS -


60/236

60 A30808-X3247-M41-4-7618


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)

HANDO


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.)

FACCH

CHALNHLY[20 (Full

V1/V2) or 21(AMR)]


ferred one

CHALNHLY[2 or 3]

MEBUSTCH [1]

MEBUTSLY [FR & LY]


ATINHIRC (*)


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InformationSystem


ESTIN new TCH

DATIN (HO CMP)

MRPCI

DT1 (HO CMP)

DT1 (CL CMP)

DT1 (CL CMD)


INDICATION.


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

(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 (*)

NRCLRCMD (3.)

RELRQ

RELCN

RCHRL (Old TCH)

RCHRA

Stop T_MSRFPCI

FACCH

FACCH





MBTCHCH

MEBUSTCH =MEBUTSLY -

ABSPDIS -


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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 new SDCCH

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

CHALNHLY [19]


ferred one

CHALNHLY [1]

MBUSYSD (+)


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InformationSystem



MRPCI

ASDCALTI (stop)

MBUSYSD -

MBUSYSSP [4]

(accumulation) (**)

NASUSDPE

DT1 (HOPER)


INDICATION.

(*)


RELRQ

RELCN

RCHRL (Old SDCCH)

RCHRA


Note: Subcounter of MBUSYSSP depends on type of original SDCCH transaction at call setup.(**)


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1.2.4.11 Unsuccessful SDCCH-SDCCH Inter-Cell Handover Attempt, Intra-

BSC, No SDCCH Available in Target Cell


......

......

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.

When the BSC receives an INTERCELL HANDOVER CONDITION INDICATION for and

SDCCH-SDCCH handover with a valid target cell, it first checks the administrative state(locked/unlocked/shutting down) and the availability state (enabled/disabled) of the target BTS objects.

Only if the BSC finds one target BTS in state "unlocked/enabled", the BSC starts to search for an

available SDCCH in the "idle list" of the target cell. Only in this case the measurements ATINHIRC

(for the originating BTS) and NATTSDPE (for the target BTS) are triggered. If no SDCCH can be found

due to SDCCH congestion, "locked" state of the TRXs or/and "locked" state of the CHAN objects in the

target BTS, ATSDCMBS is triggered for the target BTS in addition and the next target cell is analyzed.

If no target BTS in state "unlocked/enabled" can be found, NHOINRHA is triggered. In this case neither

ATINHIRC nor NATTSDPE nor ATSDCMBS are increased.

CHALNHLY [19] total request

CHALNHLY [1] not served

(*)

BWHCI

(with HO cause)

NATTSDPE (**) (***)

ATSDCMBS (**) (***)

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

BWHCI

(with HO cause)

Start THORQST

Expiry THORQST

Call in progress...


(**)

NATTSDPE (**) (***)

ATSDCMBS (**) (***)

ATINHIRC (*)(**) (***)

NHOINRHA (3.)(**)

(***)


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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

UISHIRLC

HO CMD islost ...

DT1 (CL REQ)(cause: radio interface

message failure)

DT1 (CL CMD)

DT1 (CL CMP)

RELCN

RELRQ

RCHRL (Old SDCCH)

RCHRA

Call in progress...

NRCLRCMD (13.)

NRCLRREQ (21.)

CHALNHLY [19]


ferred one

CHALNHLY [1]

MBUSYSD (+)


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ASDCALTI (stop) (*)

MBUSYSD - dec for 2 sd-

cch


INDICATION.

(*)

Reset T_MSRFPCI

RCHRA

RLSD

RCHRL (New SDCCH)

RLC


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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...

CHALNHLY[20 (Full

V1/V2) or 21(AMR)]


ferred one

CHALNHLY[2 or 3]

MEBUSTCH [1]

MEBUTSLY [FR & LY]


ATINHIRC (*)


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BTSold BTSnewMS

I (HO CMP)

DATIN (HO CMP)

MRPCI

DT1 (HO CMP)

RELRQ

DT1 (CL CMD)

Stop T8

SUINBHDO (*)

NRCLRCMD (3.)

BSCnewBSCold MSC

DT1 (CL CMP)RELCN

RCHRA

RLSD

SUCTCHSE (1.)

Note: Subcounter dependson 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 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)





MBTCHCH

MEBUSTCH =

MEBUTSLY -

ABSPDIS -


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

Target Cell, FR Call

BTSold BTSnewMS BSCnewBSCold MSC

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.

(*)

(**) ATTCHSEI and ATCHSMBS are only triggered if the target BTS indicated in the HO REQ message is

in state unlocked/enabled.

Also CHALHNLY is triggered: 20 [if full V1/V2] and 11. Also 21 [if AMR] and 12.

ATTCHSEI (1.)(**)(***)

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

ATINHIRC (*)(**)(***)

NHOINRHA (3.)(**)

(***)


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

TCH, FR Call (T3124 Expiry)

BTSold BTSnewMS BSCnewBSCold MSC

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)

DT1 (HO CMD; 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

Documents

Layer 3 Message_Siemens