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BSC Counters: Handover Measurement dn9813636 Issue 8-0 en # Nokia Corporation Nokia Proprietary and Confidential 1 (163) 2003319 Nokia BSC/TCSM S11 Product Documentation

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BSC Counters: HandoverMeasurement

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2003319Nokia BSC/TCSM S11 Product Documentation

Page 2: BSC Counters Handover

The information in this documentation is subject to change without notice and describes only theproduct defined in the introduction of this documentation. This documentation is intended for theuse of Nokia's customers only for the purposes of the agreement under which the documentationis submitted, and no part of it may be reproduced or transmitted in any form or means without theprior written permission of Nokia. The documentation has been prepared to be used byprofessional and properly trained personnel, and the customer assumes full responsibility whenusing it. Nokia welcomes customer comments as part of the process of continuous developmentand improvement of the documentation.

The information or statements given in this documentation concerning the suitability, capacity, orperformance of the mentioned hardware or software products cannot be considered binding butshall be defined in the agreement made between Nokia and the customer. However, Nokia hasmade all reasonable efforts to ensure that the instructions contained in the documentation areadequate and free of material errors and omissions. Nokia will, if necessary, explain issueswhich may not be covered by the documentation.

Nokia's liability for any errors in the documentation is limited to the documentary correction oferrors. NOKIA WILL NOT BE RESPONSIBLE IN ANY EVENT FOR ERRORS IN THISDOCUMENTATION OR FOR ANY DAMAGES, INCIDENTAL OR CONSEQUENTIAL(INCLUDING MONETARY LOSSES), that might arise from the use of this documentation or theinformation in it.

This documentation and the product it describes are considered protected by copyrightaccording to the applicable laws.

NOKIA logo is a registered trademark of Nokia Corporation.

Other product names mentioned in this documentation may be trademarks of their respectivecompanies, and they are mentioned for identification purposes only.

Copyright © Nokia Corporation 2003. All rights reserved.

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Contents

Contents 3

List of tables 4

List of figures 5

Summary of changes 9

1 BSC Counters: Handover Measurement 11

2 Counters of Handover Measurement 21

3 Signalling charts of Handover Measurement 103

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Contents

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List of tables

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List of figures

Figure 1. Successful internal intra-cell TCH to TCH handover 104

Figure 2. Successful internal inter-cell TCH to TCH handover 105

Figure 3. Successful external TCH to TCH handover, source BSC 107

Figure 4. Successful external TCH to TCH handover, target BSC 108

Figure 5. Successful internal intra-cell SDCCH to SDCCH handover 109

Figure 6. Successful internal inter-cell SDCCH to SDCCH handover 110

Figure 7. Successful external SDCCH to SDCCH handover, source BSC 112

Figure 8. Successful external SDCCH to SDCCH handover, target BSC 113

Figure 9. Internal intra-cell directed retry including feature BSS6114: TCHassignment to the super-reuse TRX in IUO 114

Figure 10. Internal inter-cell directed retry, including feature BSS6114 TCHassignment to the super-reuse TRX in IUO 115

Figure 11. External directed retry, source BSC 116

Figure 12. External directed retry, target BSC 117

Figure 13. Unsuccessful internal intra-cell TCH to TCH handover due to a lack ofresources 118

Figure 14. Unsuccessful internal inter-cell TCH to TCH handover due to a lack ofresources 119

Figure 15. Unsuccessful external TCH to TCH handover due to a lack of resources,source BSC 120

Figure 16. Unsuccessful external TCH to TCH handover due to a lack of resources,target BSC 121

Figure 17. Unsuccessful internal intra-cell TCH to TCH handover because ahandover is not allowed at this phase of the call 122

Figure 18. Unsuccessful internal inter-cell TCH to TCH handover because ahandover is not allowed at this phase of the call 123

Figure 19. Unsuccessful external TCH to TCH handover because a handover is notallowed, source BSC 124

Figure 20. Unsuccessful internal intra-cell TCH to TCH handover due to a failure inthe activation of a new channel 125

Figure 21. Unsuccessful internal inter-cell TCH to TCH handover due to a failure inthe activation of a new channel 126

Figure 22. Unsuccessful external TCH to TCH handover due to a failure in the

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activation of a new channel, target BSC 127

Figure 23. Unsuccessful internal intra-cell TCH to TCH handover due to losing theMS during handover. The GSM timer T3107 expires. 128

Figure 24. Unsuccessful internal inter-cell TCH to TCH handover due to losing theMS during handover. The GSM timer T3103 expires. 129

Figure 25. Unsuccessful internal intra-cell TCH to TCH handover due to MS returningto the old channel 130

Figure 26. Unsuccessful internal inter-cell TCH to TCH handover due to MS returningto the old channel 131

Figure 27. Unsuccessful external TCH to TCH handover due to MS returning to theold channel, source BSC 132

Figure 28. Unsuccessful external TCH to TCH handover due to MS returning to theold channel, target BSC 133

Figure 29. Unsuccessful internal intra-cell TCH to TCH handover due to call clearingduring handover 134

Figure 30. Unsuccessful internal inter-cell TCH to TCH handover due to call clearingduring handover 135

Figure 31. Unsuccessful external TCH to TCH handover due to call clearing duringhandover, source BSC 136

Figure 32. Unsuccessful internal intra-cell TCH to TCH handover because no radioresources are available due to switch_crc_pool 137

Figure 33. Unsuccessful internal inter-cell TCH to TCH handover because no radioresources are available due to switch_crc_pool 138

Figure 34. Unsuccessful external TCH to TCH handover because no radio resourcesare available due to switch_crc_pool , target BSC 139

Figure 35. Successful handover type reselection from an internal intra-cell TCH toTCH handover to an external handover due to switching the circuitpool 140

Figure 36. Successful handover type reselection from an internal inter-cell TCH toTCH handover to an external handover due to switching the circuitpool 141

Figure 37. Unsuccessful external TCH to TCH handover because the MSC rejectsthe handover due to various causes, source BSC 142

Figure 38. Unsuccessful external TCH to TCH handover due to GSM timer T8 expiry,source BSC 143

Figure 39. Unsuccessful external TCH to TCH handover due to adjacent cell error,source BSC 144

Figure 40. Unsuccessful internal intra-cell TCH to TCH handover, caused by an

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internal timer expiry in the BSC or a CONNECTION_FAILURE,ERROR_INDICATION, or ERROR_REPORT message coming to thetarget channel 145

Figure 41. Unsuccessful internal inter-cell TCH to TCH handover due to a radio linkfailure during handover 146

Figure 42. Unsuccessful internal inter-cell TCH to TCH handover caused by internaltimer expiry or a failure in the connection of a bi-directional speechpath 147

Figure 43. Unsuccessful external TCH to TCH handover due to a radio link failureduring handover, source BSC 148

Figure 44. Unsuccessful external TCH to TCH handover due to a radio link failureduring handover, target BSC 149

Figure 45. Unsuccessful external TCH or TCH handover, source BSC 150

Figure 46. Unsuccessful external TCH to TCH handover, target BSC 151

Figure 47. Successful internal intra-cell TCH TCH HSCSD handover from two to onechannel 152

Figure 48. Successful internal intra-cell TCH TCH HSCSD handover from one tothree channels 153

Figure 49. Successful internal inter-cell TCH TCH HSCSD handover from three toone channel 154

Figure 50. Successful internal inter-cell TCH TCH HSCSD handover from two tothree channels 155

Figure 51. Successful external TCH TCH HSCSD handover from two to twochannels, source BSC 156

Figure 52. Successful external TCH TCH HSCSD handover from four to one channel,target BSC 157

Figure 53. Successful external TCH TCH HSCSD handover from one to twochannels, target BSC 158

Figure 54. Internal intra-cell direct access from regular DCCH to a super-reuseTRX 159

Figure 55. Internal inter-cell direct access from parent DCCH to the child or parentTRX 160

Figure 56. Internal inter-cell direct access from the TCH on a child TRX to the TCH ona parent TRX 161

Figure 57. Handover attempt due to a BSC controlled TRHO 162

Figure 58. Handover attempt due to DADL/B 163

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List of figures

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Summary of changes

Summary of changes

Changes between document issues are cumulative. Therefore, the latest documentissue contains all changes made to previous issues.

Changes made between issues 8 and 7

1. Introduction

The link targets updated

The new counters 004174 - 004183 added to the counter list.

2. Counters

The cell titles in the tables updated to conform with the S11 release.

The information updated for the following counter: 004137.

The following new counters added: 004174 - 004183.

Changes made between issues 7 and 6

1. Introduction

The following new counters added: 004144-004173

2. Counters

The following new counters added: 004144-004173

The information updated for the following counters: 004133-004136

Changes made between issues 6 and 5

1. Introduction

The following new counters added: 004131-004143

2. Counters

The following new counters added: 004131-004143

The information updated for the following counters: 004007, 004036, 004038

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1 BSC Counters: Handover Measurement

The handover measurement registers information concerning the number ofhandovers (HO) controlled by the Mobile Switching Centre (MSC) or the BaseStation Controller (BSC). The recorded items of data comprise the number of theincoming, outgoing, or intra-cell HOs, and the number of successful andunsuccessful attempts, seizures, and HOs. The HOs are sorted according todirection, where appropriate. This measurement type collects one set of results foreach cell. Signalling charts are drawn with the accuracy of message interface.

For more information on the documentation of the counters, with an exampletable and an explanation of the table fields, see Performance measurements forS11 .

MSC incoming counters:

MSC I success HO 004000

MSC I unsuccessful HO due lack 004001

MSC I unsuccessful HO due conn 004002

MSC I unsuccessful HO due BSS problem 004003

MSC I TCH TCH 004043

MSC I SDCCH TCH 004044

MSC I SDCCH 004045

MSC I TCH TCH attempt 004046

MSC I SDCCH TCH attempt 004047

MSC I SDCCH attempt 004048

MSC I end of HO 004080

MSC I att switch circuit pool 004092

MSC I success switch circuit pool 004093

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MSC I unsuccessful due A interface circuit 004101

MSC I call possible dropped during HO 004108

MSC I attempt for HSCSD 004114

MSC I success for HSCSD 004115

MSC I success increased for HSCSD 004116

MSC I success decreased for HSCSD 004117

MSC outgoing counters:

MSC O success HO 004004

MSC O generated HO required messages 004005

MSC O unsuccessful HO due return 004006

MSC O end of HO 004007

MSC O end of HO due BSS 004008

MSC O generated HO command messages 004009

MSC O HO not allowed 004037

MSC O call clear during HO 004041

MSC O TCH TCH 004049

MSC O SDCCH TCH 004050

MSC O SDCCH 004051

MSC O TCH TCH attempt 004052

MSC O SDCCH TCH attempt 004053

MSC O SDCCH attempt 004054

MSC O fail lack 004055

MSC O attempt switch circuit pool 004094

MSC O success switch circuit pool 004095

MSC O adjacent cell identification error 004100

MSC O unsuccessful due a if crc 004102

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MSC O call dropped during HO 004107

MSC O attempt for HSCSD 004112

MSC O success for HSCSD 004113

BSC incoming counters:

BSC I success HO 004010

BSC I unsuccessful HO due lack 004011

BSC I unsuccessful HO due conn 004012

BSC I unsuccessful HO due BSS problem 004013

BSC I TCH TCH 004056

BSC I SDCCH TCH 004057

BSC I SDCCH 004058

BSC I TCH TCH attempt 004059

BSC I SDCCH TCH attempt 004060

BSC I SDCCH attempt 004061

BSC I nonopt 004062

BSC I nonopt attempt 004063

BSC I end of HO 004081

BSC I dropped calls 004083

BSC I unsuccessful due A interface circuit type 004097

BSC I attempt for HSCSD 004120

BSC I success for HSCSD 004121

BSC I success increased for HSCSD 004122

BSC I success decreased for HSCSD 004123

BSC outgoing counters:

BSC O success HO 004014

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BSC O unsuccessful HO due return 004015

BSC O end of HO 004016

BSC O end of HO due BSS 004017

BSC O HO not allowed 004038

BSC O call clear during HO 004042

BSC O TCH TCH 004064

BSC O SDCCH TCH 004065

BSC O SDCCH 004066

BSC O TCH TCH attempt 004067

BSC O SDCCH TCH attempt 004068

BSC O SDCCH attempt 004069

BSC O nonopt 004070

BSC O nonopt attempt 004071

BSC O fail lack 004072

BSC O dropped calls 004084

BSC O unsuccessful A interface circuit type 004096

BSC O attempt for HSCSD 004118

BSC O success for HSCSD 004119

BSC Intra-cell handover counters:

Intra-cell success HO 004018

Intra-cell unsuccessful HO due lack 004019

Intra-cell unsuccessful HO due move 004020

Intra-cell unsuccessful HO due BSS problem 004021

Intra-cell unsuccessful HO due return 004022

Intra-cell HO not allowed 004036

Intra-cell call cleared during HO 004039

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Cell TCH TCH 004073

Cell SDCCH TCH 004074

Cell SDCCH 004075

Cell TCH TCH attempt 004076

Cell SDCCH TCH attempt 004077

Cell SDCCH attempt 004078

Cell dropped calls 004085

Intra-cell unsuccessful A interface circuit type 004098

Intra-cell attempt for HSCSD 004124

Intra-cell success for HSCSD 004125

Intra-cell success increased for HSCSD 004126

Intra-cell success decreased for HSCSD 004127

Intra-segment handover counters:

Successful SDCCH-SDCCH HO between BTSs within asegment

004131

Successful TCH-TCH HO between BTSs within a segment 004132

Inter band attempted SDCCH-SDCCH HO between BTSswithin a segment

004133

Inter band successful SDCCH-SDCCH HO between BTSswithin a segment

004134

Inter band attempted TCH-TCH HO between BTSs within asegment

004135

Inter band successful TCH-TCH HO between BTSs within asegment

004136

Inter BTS-type attempted SDCCH-SDCCH HO within asegment

004137

Inter BTS-type successful SDCCH-SDCCH HO within asegment

004138

Inter BTS-type attempted TCH-TCH HO within a segment 004139

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Inter BTS-type successful TCH-TCH HO within a segment 004140

Handover cause counters:

Cause uplink quality 004023

Cause uplink level 004024

Cause downlink quality 004025

Cause downlink level 004026

Cause distance 004027

Cause response to MSC invocation 004028

Cause high interference on uplink 004029

Cause high interference on downlink 004030

Cause umbrella HO 004031

Cause power budget HO 004032

Cause HO started by OMC 004033

Cause HO started by traffic reason 004035

Cause directed retry 004079

Cause pre-emption 004086

Cause field drop 004087

Cause low distance 004088

Cause bad C/I ratio 004089

Cause good C/I ratio 004090

HO due slow moving MS 004091

HO attempt due switch circuit pool 004099

HO from normal to extended area 004103

HO from extended to normal area 004104

HO due to MS slow speed 004105

HO due to MS high speed 004106

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HO attempt due to bad RX level on super 004109

HO attempt due to good RX level on regular 004110

HO attempt due ERFD 004111

HO attempt due to direct access 004128

HO attempt due DADLB 004129

HO attempt due to GPRS 004130

Intra cell HO attempts due to HSCSD traffic 004141

HO attempts due to channel rate change from AMR FR toAMR HR

004142

HO attempts due to channel rate change from AMR HR toAMR FR

004143

Non-relevant counters:

Cause HO started by channel administration 004034

MSC I call clear during HO 004040

BSC O MS required enquiry proc 004082

Inter-System Handover counters:

MSC I TCH HO from WCDMA RAN attempt 004144

MSC I WCDMA RAN TCH HO attempt unsucc due lack 004145

MSC I WCDMA RAN HO attempt unsucc due BSS problem 004146

MSC I WCDMA RAN end of HO 004147

MSC I unsuccess HO WCDMA RAN due conn 004148

MSC I HO WCDMA RAN TCH success 004149

MSC O TCH HO to WCDMA RAN attempt 004150

MSC O HO to WCDMA RAN not allowed 004151

MSC O end of HO to WCDMA RAN due BSS 004152

MSC O gen inter system to WCDMA RAN handover req 004153

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messages

MSC O gen inter system to WCDMA RAN handover commessages

004154

MSC O to WCDMA RAN fail lack 004155

MSC O end of HO to WCDMA RAN 004156

MSC O call drop during HO to WCDMA RAN 004157

MSC O to WCDMA RAN success TCH HO 004158

Common BCCH Control for GSM counters:

Successful HO inter band TCH 004159

Unsuccessful HO inter band TCH 004161

HO attempt inter band due level 004163

Unsucc HO inter band due level 004164

Succ HO inter band due level 004165

Inter segment success SDCCH HO between bands 004166

Inter segment success TCH HO between bands 004168

Multi BCF Control counters:

Successful HO inter BTS type TCH 004160

Unsuccessful HO inter BTS type TCH 004162

Inter segment success SDCCH HO between BTS types 004167

Inter segment success TCH HO between BTS types 004169

Inter PLMN Handover counters, incoming handovers:

Incoming MSC HO attempts from inter-PLMN intra-GSM

004174

Incoming successful MSC HO from inter-PLMN intra-GSM

004175

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Incoming failed MSC HO from inter-PLMN intra-GSM 004176

Inter PLMN Handover counters, outgoing handovers:

Outgoing MSC HO attempts from inter-PLMN intra-GSM

004177

Outgoing successful MSC HO from inter-PLMN intra-GSM

004178

Outgoing failed MSC HO from inter-PLMN intra-GSM 004179

GSM-WCDMA Interworking Enhancement counters

HO attempts due to ISHO 004180

HO attempts due to inter-system direct access 004181

Outgoing SDCCH-TCH handover attempts toWCDMA RAN controlled by MSC

004182

Successful outgoing SDCCH-TCH handovers toWCDMA RAN controlled by MSC

004183

Spare counters:

Spare 004170

Spare 004171

Spare 004172

Spare 004173

Related topics

Counters of Handover Measurement

Signalling charts of Handover Measurement

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2 Counters of Handover Measurement

Number

Name

Release

004000

MSC I SUCCESS HO

S1

Trigger points See figures:. Successful external TCH to TCH handover, target BSC. Successful external SDCCH to SDCCH handover, target BSC. External directed retry, target BSC. Successful external TCH TCH HSCSD handover from four to one

channel, target BSC. Successful external TCH TCH HSCSD handover from one to two

channels, target BSC

Description Number of successful incoming HOs controlled by the MSC.

Updated When the HO (SDCCH to SDCCH, SDCCH to TCH or TCH to TCH) iscompleted.

Dependencies with othercounters/PI(s)

When one of the counters 004043, 004044 or 004045 is updated. Thiscounter represents their sum.

Number

Name

Release

004001

MSC I UNSUCCESS HO DUE LACK

S1

Trigger points See figure Unsuccessful external TCH to TCH handover due to a lackof resources, target BSC

Description Number of incoming HOs, controlled by the MSC, that areunsuccessful due to a lack of radio resources.

Updated a) When no SDCCH is available for an SDCCH HO.

b) When no TCH is available for a TCH HO.

c) When no TCH is available for an SDCCH to TCH HO.

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Number

Name

Release

004001

MSC I UNSUCCESS HO DUE LACK

S1

Impact HO failure

Reason for the impact Internal

Number

Name

Release

004002

MSC I UNSUCCESS HO DUE CONN

S1

Trigger points See figure Unsuccessful external TCH to TCH handover due to aradio link failure during handover, target BSC

Description Number of incoming HOs, controlled by the MSC, that areunsuccessful due to a connection failure.

Updated When the connection between the MS and the BTS is broken (on thetarget channel), that is, when a message carrying an indication of aconnection failure is received (radio link failure or transcoder failure).

Impact HO failure

Reason for the impact External/Abis interface

Number

Name

Release

004003

MSC I UNSUCCESS HO DUE BSS PROBLEM

S1

Trigger points See figure Unsuccessful external TCH to TCH handover due to afailure in the activation of a new channel

Description Number of incoming HOs, controlled by the MSC, that areunsuccessful because of BSS problems.

Updated When the radio channel activation fails.

Impact HO failure

Reason for the impact External/Abis interface

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Number

Name

Release

004004

MSC O SUCCESS HO

S1

Trigger points See figures:. Successful external TCH to TCH handover, source BSC. Successful external SDCCH to SDCCH handover, source BSC. External directed retry, source BSC. Successful handover type reselection from an internal intra-cell

TCH to TCH handover to an external handover due to switchingcircuit pool

. Successful handover type reselection from an internal inter-cellTCH to TCH handover to an external handover due to switchingthe circuit pool

. Successful external TCH TCH HSCSD handover from two to twochannels, source BSC

Description Number of successful outgoing HOs controlled by the MSC.

Updated When the HO (SDCCH to SDCCH, SDCCH to TCH or TCH to TCH) iscompleted.

Dependencies with othercounters/PI(s)

This counter is updated when one of the counters 004049, 004050 or004051 is updated. This counter represents their sum.

Number

Name

Release

004005

MSC O GEN HO REQUIRED MESSAGES

S1

Trigger points See figures:. Successful external TCH to TCH handover, source BSC. Successful external SDCCH to SDCCH handover, source BSC. External directed retry, source BSC. Unsuccessful external TCH to TCH handover due to a lack of

resources, source BSC. Unsuccessful external TCH to TCH handover due to MS returning

to the old channel, source BSC. Unsuccessful external TCH to TCH handover due to call clearing

during handover, source BSC. Successful handover type reselection from an internal intra-cell

TCH to TCH handover to an external handover due to switchingthe circuit pool

. Successful handover type reselection from an internal inter-cellTCH to TCH handover to an external handover due to switchingthe circuit pool

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Number

Name

Release

004005

MSC O GEN HO REQUIRED MESSAGES

S1

. Unsuccessful external TCH to TCH handover because the MSCrejects the handover due to various causes, source BSC

. Unsuccessful external TCH to TCH handover due to GSM timerT8 expiry, source BSC

. Unsuccessful external TCH to TCH handover due to adjacent cellerror, source BSC

. Unsuccessful external TCH or TCH handover, source BSC

. Successful external TCH TCH HSCSD handover from two to twochannels, source BSC

Description Total number of the HO_REQUIRED messages that are generated byoutgoing HOs controlled by the MSC.

Updated When the BSC sends the HANDOVER_ REQUIRED message to theMSC.

Number

Name

Release

004006

MSC O UNSUCCESS HO DUE RETURN

S1

Trigger points See figure Unsuccessful external TCH to TCH handover due to MSreturning to the old channel, source BSC

Description Number of outgoing HOs, controlled by the MSC, that areunsuccessful because the MS returns to the source channel.

Updated When the MS returns to the source channel.

Impact HO failure.

Reason for the impact External/Abis interface.

Number

Name

Release

004007

MSC O END OF HO

S1

Trigger points See figures:. Unsuccessful external TCH to TCH handover because the MSC

rejects the handover due to various causes, source BSC. Unsuccessful external TCH to TCH handover due to GSM timer

T8 expiry, source BSC

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Number

Name

Release

004007

MSC O END OF HO

S1

Description Number of the end of handover procedures (outgoing HO controlledby the MSC).

Updated a) When the GSM timer T8 expires (the CLEAR_COMMANDmessage not received).

b) When the HO is rejected with another cause than switch_crc_pool,cip_type_mismatch, invalid_cell, no_radio_res_avail,req_terr_res_unava or T7_expiry.

c) When the MSC sends a CLEAR_COMMAND message with areason other than handover successful or call control to the BSC.

d) When there is an internal conflict with the A interface.

Impact HO failure (b and d)

Possibly call cleared (a and c)

Reason for the impact External/A interface

Number

Name

Release

004008

MSC O END OF HO DUE BSS

S1

Trigger points See figure Unsuccessful external TCH to TCH handover due to aradio link failure during handover, source BSC

Description Number of the end of handover procedures due to BSS problems(outgoing HO controlled by the MSC).

Updated When the connection between the MS and the BTS is broken (on thesource channel), that is, when a message carrying an indication of aconnection failure is received (radio link failure or transcoder failure).

Impact The call may possibly be cleared.

Reason for the impact External/Abis interface.

Number

Name

Release

004009

MSC O GEN HO COM MESSAGES

S1

Trigger points See figures:

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Number

Name

Release

004009

MSC O GEN HO COM MESSAGES

S1

. Successful external TCH to TCH handover, source BSC

. Successful external SDCCH to SDCCH handover, source BSC

. External directed retry, source BSC

. Unsuccessful external TCH to TCH handover due to MS returningto the old channel, source BSC

. Unsuccessful external TCH to TCH handover due to call clearingduring handover, source BSC

. Successful handover type reselection from an internal intra-cellTCH to TCH handover to an external handover due to switchingthe circuit pool

. Successful handover type reselection from an internal inter-cellTCH to TCH handover to an external handover due to switchingthe circuit pool

. Unsuccessful external TCH to TCH handover due to GSM timerT8 expiry, source BSC

. Successful external TCH TCH HSCSD handover from two to twochannels, source BSC

Description Number of the HANDOVER_COMMAND messages that aregenerated by outgoing HOs controlled by the MSC.

Updated When HANDOVER_COMMAND is sent to the MS.

Number

Name

Release

004010

BSC I SUCCESS HO

S1

Trigger points See figures:. Successful internal inter-cell TCH to TCH handover. Successful internal inter-cell SDCCH to SDCCH handover. Internal inter-cell directed retry, including feature BSS6114 TCH

assignment to the super-reuse TRX in IUO. Successful internal inter-cell TCH TCH HSCSD handover from

three to one channel. Successful internal inter-cell TCH TCH HSCSD handover from

two to three channels. Internal inter-cell direct access from parent DCCH to the child or

parent TRX. Internal inter-cell direct access from the TCH on a child TRX to the

TCH on a parent TRX

Description Number of successful incoming HOs controlled by the BSC.

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Number

Name

Release

004010

BSC I SUCCESS HO

S1

Updated When the HO (SDCCH to SDCCH, SDCCH to TCH or TCH to TCH) iscompleted.

Dependencies with othercounters/PI(s)

When one of the counters 004056, 004057 or 004058 is updated. Thiscounter represents their sum.

Number

Name

Release

004011

BSC I UNSUCCESS HO DUE LACK

S1

Trigger points See figure Unsuccessful internal inter-cell TCH to TCH handover dueto a lack of resources

Description Number of incoming HOs, controlled by the BSC, that areunsuccessful due to a lack of resources.

Updated a) When no SDCCH is available for an SDCCH HO.

b) When no TCH is available for a TCH HO.

c) When no TCH is available for an SDCCH to TCH HO.

Dependencies with othercounters/PI(s)

Counter 004072 is updated along with this counter.

Impact HO failure

Reason for the impact Internal

Number

Name

Release

004012

BSC I UNSUCCESS HO DUE CONN

S1

Trigger points See figures:. Unsuccessful internal inter-cell TCH to TCH handover due to

losing the MS during handover. The GSM timer T3103 expires. Unsuccessful internal inter-cell TCH to TCH handover due to MS

returning to the old channel

Description Number of incoming HOs, controlled by the BSC, that areunsuccessful due to a connection failure (the MS fails to move to thetarget channel).

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Number

Name

Release

004012

BSC I UNSUCCESS HO DUE CONN

S1

Updated a) When the MS returns to the source channel

b) When the MS is lost (GSM timer T3103 expires).

c) When the connection between the MS and the BTS is broken (onthe target channel), that is, when a message carrying an indication ofa connection failure is received (radio link failure or transcoder failure).

Dependencies with othercounters/PI(s)

a) Counter 004015 is updated along with this counter.

b) Counters 004016, 004083 and 004084 are updated along with thiscounter.

c) Counter 004016 or 004042 is updated along with this counter.

Impact HO failure

The call may possibly be cleared

Reason for the impact External/Abis interface

Number

Name

Release

004013

BSC I UNSUCCESS HO DUE BSS PROBLEM

S1

Trigger points See figures:. Unsuccessful internal inter-cell TCH to TCH handover due to a

failure in the activation of a new channel. Unsuccessful internal inter-cell TCH to TCH handover caused by

internal timer expiry or a failure in the connection of a bi-directionalspeech path

Description Number of incoming HOs, controlled by the BSC, that areunsuccessful due to BSS problems.

Updated a) When the radio channel activation fails.

b) When switching from a unidirectional to a bi-directional speech pathfails.

Dependencies with othercounters/PI(s)

a) Counter 004016 is updated along with this counter.

b) Counters 004017, 004083 and 004084 are updated along with thiscounter.

Impact a) HO failure

b) Call cleared

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Number

Name

Release

004013

BSC I UNSUCCESS HO DUE BSS PROBLEM

S1

Reason for the impact External/Abis interface or Internal/A -interface

Number

Name

Release

004014

BSC O SUCCESS HO

S1

Trigger points See figures:. Successful internal inter-cell TCH to TCH handover. Successful internal inter-cell SDCCH to SDCCH handover. Internal inter-cell directed retry, including feature BSS6114 TCH

assignment to the super-reuse TRX in IUO. Successful internal inter-cell TCH TCH HSCSD handover from

three to one channel. Successful internal inter-cell TCH TCH HSCSD handover from

two to three channels. Internal inter-cell direct access from parent DCCH to the child or

parent TRX. Internal inter-cell direct access from the TCH on a child TRX to the

TCH on a parent TRX

Description Number of successful outgoing HOs controlled by the BSC.

Updated When the HO (SDCCH to SDCCH, SDCCH to TCH or TCH to TCH) iscompleted.

Dependencies with othercounters/PI(s)

This counter is updated when one of the counters 004064, 004065 or004066 is updated. This counter represents their sum.

Number

Name

Release

004015

BSC O UNSUCCESS HO DUE RETURN

S1

Trigger points See figure Unsuccessful internal inter-cell TCH to TCH handover dueto MS returning to the old channel

Description Number of outgoing HOs, controlled by the BSC, that areunsuccessful because the MS returns to the source channel.

Updated When the MS returns to the source channel.

Dependencies with other Counter 004012 is updated along with this counter.

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Number

Name

Release

004015

BSC O UNSUCCESS HO DUE RETURN

S1

counters/PI(s)

Impact HO failure

Reason for the impact External/Abis interface

Number

Name

Release

004016

BSC O END OF HO

S1

Trigger points See figures:. Unsuccessful internal inter-cell TCH to TCH handover due to a

failure in the activation of a new channel. Unsuccessful internal inter-cell TCH to TCH handover due to

losing the MS during handover. The GSM timer T3103 expires

Description Number of the end of handover procedures that are related tooutgoing HOs controlled by the BSC.

Updated a) When the MS is lost (GSM timer T3103 expires).

b) When radio channel activation fails.

c) When the connection between the MS and the BTS is broken (onthe target channel), that is, when a message carrying an indication ofa connection failure is received (radio link failure or transcoder failure).

Dependencies with othercounters/PI(s)

a) Counters 004012, 004083 and 004084 are updated along with thiscounter.

b) Counter 004013 is updated along with this counter.

c) Counter 004012 is updated along with this counter.

Impact a) Call cleared

b) and c) HO failure

Reason for the impact External/Abis interface

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Number

Name

Release

004017

BSC O END OF HO DUE BSS

S1

Trigger points See figures:. Unsuccessful internal inter-cell TCH to TCH handover due to a

radio link failure during handover. Unsuccessful internal inter-cell TCH to TCH handover caused by

internal timer expiry or a failure in the connection of a bi-directionalspeech path

Description Number of outgoing HOs, controlled by the BSC, that areunsuccessful due to BSS problems.

Updated a) When the connection between the MS and the BTS is broken (onthe source channel), that is, when a message carrying an indication ofa connection failure is received (radio link failure or transcoder failure)before the HO_COMMAND message.

b) When switching from a unidirectional to a bi-directional speech pathfails.

Dependencies with othercounters/PI(s)

a) Counter 004081 is updated along with this counter.

b) Counters 004013, 004083 and 004084 are updated along with thiscounter.

Impact Call cleared.

Reason for the impact External/Abis interface

Number

Name

Release

004018

INT CELL SUCCESS HO

S1

Trigger points See figures:. Successful internal intra-cell TCH to TCH handover. Successful internal intra-cell SDCCH to SDCCH handover. Internal intra-cell directed retry including feature BSS6114: TCH

assignment to the super-reuse TRX in IUO. Successful internal intra-cell TCH TCH HSCSD handover from

two to one channel. Successful internal intra-cell TCH TCH HSCSD handover from

one to three channels. Internal intra-cell direct access from regular DCCH to a super-

reuse TRX

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Number

Name

Release

004018

INT CELL SUCCESS HO

S1

Description Number of successful intra-cell HOs.

Updated When the HO (SDCCH to SDCCH, TCH to TCH or SDCCH to TCH) iscompleted.

Dependencies with othercounters/PI(s)

This counter is updated when one of the counters 004073, 004074 or004075 is updated. This counter represents their sum.

Number

Name

Release

004019

INT CELL UNSUCCESS HO DUE LACK

S1

Trigger points See figure Unsuccessful internal intra-cell TCH to TCH handover dueto lack of resources

Description Number of intra-cell HOs that are unsuccessful due to a lack ofresources.

Updated a) When no SDCCH is available for an SDCCH HO.

b) When no TCH is available for a TCH HO.

c) When no TCH is available for an SDCCH to TCH HO.

Impact HO failure

Reason for the impact Internal

Number

Name

Release

004020

INT CELL UNSUCCESS HO DUE MOVE

S1

Trigger points See figure Unsuccessful internal intra-cell TCH to TCH handover dueto losing the MS during handover. The GSM timer T3107 expires

Description Number of intra-cell HOs that are unsuccessful because the MScannot either move to the target channel or return to the sourcechannel.

Updated When the MS is lost (GSM timer T3107 expires).

Dependencies with othercounters/PI(s)

Counter 004085 is updated along with this counter.

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Number

Name

Release

004020

INT CELL UNSUCCESS HO DUE MOVE

S1

Impact Call cleared

Reason for the impact External/Abis interface

Number

Name

Release

004021

INT CELL UNSUCCESS HO DUE BSS PROBLEM

S1

Trigger points See figure Unsuccessful internal intra-cell TCH to TCH handover dueto a failure in the activation of a new channel

Description Number of unsuccessful intra-cell HOs due to BSS problems.

Updated a) When a radio channel activation fails.

b) When the physical context request fails.

c) When the connection between the MS and the BTS is broken, thatis, when a message carrying an indication of a connection failure isreceived (radio link failure or transcoder failure).

d) When switching from a unidirectional to a bi-directional speech pathfails.

Dependencies with othercounters/PI(s)

d) Counter 004085 is updated along with this counter.

Impact a) and b) HO failure

c) Possibly call cleared d) Call cleared

Reason for the impact External/Abis interface or Internal/A -interface

Number

Name

Release

004022

INT CELL UNSUCCESS HO DUE RETURN

S1

Trigger points See figures:. Unsuccessful internal intra-cell TCH to TCH handover due to MS

returning to the old channel. Unsuccessful internal intra-cell TCH to TCH handover, caused by

an internal timer expiry in the BSC or a CONNECTION_FAILURE,ERROR_INDICATION, or ERROR_REPORT message coming tothe target channel

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Number

Name

Release

004022

INT CELL UNSUCCESS HO DUE RETURN

S1

Description Number of unsuccessful intra-cell HOs due to the MS's return to thesource channel.

Updated When the MS returns to the source channel.

Impact HO failure

Reason for the impact External/Abis interface

Number

Name

Release

004023

CAUSE UPLINK QUALITY

S1

Trigger points See figures:. Successful internal inter-cell TCH to TCH handover. Successful external TCH to TCH handover, source BSC. Successful internal inter-cell SDCCH to SDCCH handover. Successful external SDCCH to SDCCH handover, source BSC

Description Number of HO attempts caused by uplink quality (outgoing).

Updated When a HO is started due to uplink quality.

Number

Name

Release

004024

CAUSE UPLINK LEVEL

S1

Trigger points See figures:. Successful internal inter-cell TCH to TCH handover. Successful external TCH to TCH handover, source BSC. Successful internal inter-cell SDCCH to SDCCH handover. Successful external SDCCH to SDCCH handover, source BSC

Description Number of HO attempts caused by uplink level (outgoing).

Updated When a HO is started due to uplink level.

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Number

Name

Release

004025

CAUSE DOWNLINK QUALITY

S1

Trigger points See figures:. Successful internal intra-cell TCH to TCH handover. Successful internal inter-cell TCH to TCH handover. Successful external TCH to TCH handover, source BSC. Successful internal intra-cell SDCCH to SDCCH handover. Successful internal inter-cell SDCCH to SDCCH handover. Successful external SDCCH to SDCCH handover, source BSC

Description Number of HO attempts caused by downlink quality (outgoing).

Updated When a HO is started due to downlink quality.

Number

Name

Release

004026

CAUSE DOWNLINK LEVEL

S1

Trigger points See figures:. Successful internal inter-cell TCH to TCH handover. Successful external TCH to TCH handover, source BSC. Successful internal inter-cell SDCCH to SDCCH handover. Successful external SDCCH to SDCCH handover, source BSC

Description Number of HO attempts caused by downlink level (outgoing).

Updated When a HO is started due to downlink level.

Number

Name

Release

004027

CAUSE DISTANCE

S1

Trigger points See figures:. Successful internal intra-cell TCH to TCH handover. Successful internal inter-cell TCH to TCH handover. Successful external TCH to TCH handover, source BSC. Successful internal intra-cell SDCCH to SDCCH handover. Successful internal inter-cell SDCCH to SDCCH handover. Successful external SDCCH to SDCCH handover, source BSC

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Number

Name

Release

004027

CAUSE DISTANCE

S1

Description Number of HO attempts caused by distance (outgoing).

Updated When a HO is started due to distance.

Number

Name

Release

004028

CAUSE RESPONSE TO MSC INVOCATION

S1

Trigger points See figures:. Successful internal inter-cell TCH to TCH handover. Successful external TCH to TCH handover, source BSC. Successful internal inter-cell SDCCH to SDCCH handover. Successful external SDCCH to SDCCH handover, source BSC

Description Number of HO attempts due to a response to an invocation from theMSC (outgoing).

Updated When a HO is started due to a response to an MSC invocation.

Number

Name

Release

004029

CAUSE HIGH INT ON UPLINK

S1

Trigger points See figures:. Successful internal intra-cell TCH to TCH handover. Successful internal inter-cell TCH to TCH handover. Successful external TCH to TCH handover, source BSC. Successful internal intra-cell SDCCH to SDCCH handover. Successful internal inter-cell SDCCH to SDCCH handover. Successful external SDCCH to SDCCH handover, source BSC

Description Number of HO attempts caused by high interference on uplink(outgoing).

Updated When a HO is started due to high interference on uplink.

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Number

Name

Release

004030

CAUSE HIGH INT ON DOWNLINK

S1

Trigger points See figures:. Successful internal intra-cell TCH to TCH handover. Successful internal inter-cell TCH to TCH handover. Successful external TCH to TCH handover, source BSC. Successful internal intra-cell SDCCH to SDCCH handover. Successful internal inter-cell SDCCH to SDCCH handover. Successful external SDCCH to SDCCH handover, source BSC

Description Number of HO attempts caused by high interference on downlink(outgoing).

Updated When a HO is started due to high interference on downlink.

Number

Name

Release

004031

CAUSE UMBRELLA HO

S1

Trigger points See figures:. Successful internal inter-cell TCH to TCH handover. Successful external TCH to TCH handover, source BSC. Successful internal inter-cell SDCCH to SDCCH handover. Successful external SDCCH to SDCCH handover, source BSC. Internal inter-cell direct access from the TCH on a child TRX to the

TCH on a parent TRX

Description Number of attempts to umbrella HO (outgoing).

Updated When a HO is started due to an umbrella HO.

Number

Name

Release

004032

CAUSE POWER BUDGET HO

S1

Trigger points See figures:. Successful internal inter-cell TCH to TCH handover. Successful external TCH to TCH handover, source BSC. Successful internal inter-cell SDCCH to SDCCH handover

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Number

Name

Release

004032

CAUSE POWER BUDGET HO

S1

. Successful external SDCCH to SDCCH handover, source BSC

Description Number of attempts to power budget HO (outgoing).

Updated When a HO is started due to a power budget HO.

Number

Name

Release

004033

CAUSE HO STARTED BY OMC

S1

Trigger points See figures:. Successful internal intra-cell TCH to TCH handover. Successful internal inter-cell TCH to TCH handover. Successful external TCH to TCH handover, source BSC. Successful internal intra-cell SDCCH to SDCCH handover. Successful internal inter-cell SDCCH to SDCCH handover. Successful external SDCCH to SDCCH handover, source BSC

Description Number of HO attempts started by the O&M (outgoing).

Updated When a HO is started by OMC.

Number

Name

Release

004034

CAUSE HO STARTED BY CHANNEL ADM

S1

Description Number of HO attempts started by channel administration (outgoing).

Updated This counter is NOT relevant.

Number

Name

Release

004035

CAUSE HO STARTED BY TRAFFIC REASON

S8

Trigger points See figure Handover attempt due to a BSC controlled TRHO

Description Number of HO attempts due to TRHO, controlled by the BSC.

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Number

Name

Release

004035

CAUSE HO STARTED BY TRAFFIC REASON

S8

Updated When a HO is started due to BSC TRHO.

Feature BSS8123 Advanced Multilayer Handling

Number

Name

Release

004036

INT CELL HO NOT ALLOWED

S1

Trigger points See figure Unsuccessful internal intra-cell TCH to TCH handoverbecause a handover is not allowed at this phase of the call

Description Number of HOs that are unsuccessful because no HOs are allowed(intra-cell HO).

Updated a) When HO execution is not allowed in the current phase of the call inprogress.

b) When a HO is interrupted because an assignment procedure hasbeen started during a HO but before the BSC has sent anASSIGNMENT_COMMAND or HANDOVER_COMMAND messageto the MS.

Impact HO failure

Reason for the impact Internal

Number

Name

Release

004037

MSC O HO NOT ALLOWED

S1

Trigger points See figures:. Unsuccessful external TCH to TCH handover because a handover

is not allowed, source BSC. Unsuccessful external TCH to TCH handover because the MSC

rejects the handover due to various causes, source BSC

Description Number of outgoing HOs, controlled by the MSC, that areunsuccessful because no HOs are allowed.

Updated a) When HO execution is not allowed in the current phase of the call inprogress.

b) When the DISABLE_INT_HO parameter is set and an underlay

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Number

Name

Release

004037

MSC O HO NOT ALLOWED

S1

overlay HO start is attempted.

c) When DISABLE_EXT_DR is set and DR is attempted.

d) When external HO is not possible due to FACCH call setup.

e) When an external HO is not possible because the neighbouring cellis defined to be the normal area of an extended cell from anotherBSC.

Impact HO failure

Reason for the impact Internal

Number

Name

Release

004038

BSC O HO NOT ALLOWED

S1

Trigger points See figure Unsuccessful internal inter-cell TCH to TCH handoverbecause a handover is not allowed at this phase of the call

Description Number of outgoing HOs, controlled by the BSC, that areunsuccessful because no HOs are allowed.

Updated - When HO execution is not allowed in the current phase of the call inprogress.

- When an HO is interrupted because the assignment procedure basbeen started during a HO but before the BSC has sent aHANDOVER_COMMAND message to the MS.

Dependencies with othercounters/PI(s)

Counter 004081 is updated along with this counter.

Impact HO failure

Reason for the impact External/A interface

Number

Name

Release

004039

INT CELL CALL CLEAR DURING HO

S1

Trigger points See figure Unsuccessful internal intra-cell TCH to TCH handover dueto call clearing during handover

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Name

Release

004039

INT CELL CALL CLEAR DURING HO

S1

Description Number of intra-cell HOs that are unsuccessful because the call iscleared.

Updated a) When the subscriber clears the call during the HO.

b) When channel blocking is started during the HO.

Reason for the impact External

Number

Name

Release

004040

MSC I CALL CLEAR DURING HO

S1

Updated This counter is NOT relevant.

Number

Name

Release

004041

MSC O CALL CLEAR DURING HO

S1

Trigger points See figure Unsuccessful external TCH to TCH handover due to callclearing during handover, source BSC

Description Number of outgoing HOs, controlled by the MSC, that areunsuccessful because the call is cleared during the HO.

Updated a) When the subscriber clears the call during the HO.

b) When channel blocking is started during the HO.

c) When the MS has sent messages concerning

- A interface speech circuits

- state changes of the BSSAP subsystem

- abnormal release of the SCCP connection

d) When the reset of circuits are received from the MSC

e) When there is a BCSU restart (if the TCHs related to the HO are inthat BCSU).

Impact Call cleared

Reason for the impact Internal or external/A interface

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Number

Name

Release

004042

BSC O CALL CLEAR DURING HO

S1

Trigger points See figure Unsuccessful internal inter-cell TCH to TCH handover dueto call clearing during handover

Description Number of outgoing HOs, controlled by the BSC, that areunsuccessful because the call is cleared.

Updated a) When the subscriber clears the call during the HO.

b) When channel blocking is started during the HO.

Dependencies with othercounters/PI(s)

Counter 004081 is updated along with this counter.

Impact Call cleared

Reason for the impact Internal or external / A interface

Number

Name

Release

004043

MSC I TCH TCH

S2

Trigger points See figures:. Successful external TCH to TCH handover, target BSC. Successful external TCH TCH HSCSD handover from four to one

channel, target BSC. Successful external TCH TCH HSCSD handover from one to two

channels, target BSC

Description Number of successful incoming TCH to TCH HOs controlled by theMSC.

Updated When the HO is completed.

Dependencies with othercounters/PI(s)

Counter 004000 is updated along with this counter.

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Number

Name

Release

004044

MSC I SDCCH TCH

S2

Trigger points See figure External directed retry, target BSC

Description Number of successful incoming SDCCH to TCH HOs controlled bythe MSC.

Updated When a directed retry procedure is completed.

Dependencies with othercounters/PI(s)

Counter 004000 is updated along with this counter.

Number

Name

Release

004045

MSC I SDCCH

S2

Trigger points See figure Successful external SDCCH to SDCCH handover, targetBSC

Description Number of successful incoming SDCCH to SDCCH HOs controlled bythe MSC.

Updated When the HO is completed.

Dependencies with othercounters/PI(s)

Counter 004000 is updated along with this counter.

Number

Name

Release

004046

MSC I TCH TCH AT

S2

Trigger points See figures:. Successful external TCH to TCH handover, target BSC. Unsuccessful external TCH to TCH handover due to a lack of

resources, target BSC. Unsuccessful external TCH to TCH handover due to a failure in

the activation of a new channel, target BSC. Unsuccessful external TCH to TCH handover due to MS returning

to the old channel, target BSC. Unsuccessful external TCH to TCH handover because no radio

resources are available due to switch_crc_pool, target BSC

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Number

Name

Release

004046

MSC I TCH TCH AT

S2

. Unsuccessful external TCH to TCH handover due to a radio linkfailure during handover, target BSC

. Unsuccessful external TCH to TCH handover, target BSC

. Successful external TCH TCH HSCSD handover from four to onechannel, target BSC

. Successful external TCH TCH HSCSD handover from one to twochannels, target BSC

Description Number of attempts to incoming TCH to TCH HOs controlled by theMSC.

Updated When the HO attempt is started.

Number

Name

Release

004047

MSC I SDCCH TCH AT

S2

Trigger points See figure External directed retry, target BSC

Description Number of attempts to incoming SDCCH to TCH HOs controlled bythe MSC.

Updated When a directed retry procedure is started.

Feature Directed Retry

Number

Name

Release

004048

MSC I SDCCH AT

S2

Trigger points See figure Successful external SDCCH to SDCCH handover, targetBSC

Description Number of attempts to incoming SDCCH to SDCCH HOs controlledby the MSC.

Updated When the HO attempt is started.

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Number

Name

Release

004049

MSC O TCH TCH

S2

Trigger points See figures:. Successful external TCH to TCH handover, source BSC. Successful handover type reselection from an internal intra-cell

TCH to TCH handover to an external handover due to switchingthe circuit pool

. Successful handover type reselection from an internal inter-cellTCH to TCH handover to an external handover due to switchingthe circuit pool

. Successful external TCH TCH HSCSD handover from two to twochannels, source BSC

Description Number of successful outgoing TCH to TCH HOs controlled by theMSC.

Updated When the HO is completed.

Number

Name

Release

004050

MSC O SDCCH TCH

S2

Trigger points See figure External directed retry, source BSC

Description Number of successful outgoing SDCCH to TCH HOs controlled by theMSC.

Updated When a directed retry procedure is completed.

Feature Directed Retry

Number

Name

Release

004051

MSC O SDCCH

S2

Trigger points See figure Successful external SDCCH to SDCCH handover, sourceBSC

Description Number of successful outgoing SDCCH to SDCCH HOs controlled bythe MSC.

Updated When the HO is completed.

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Number

Name

Release

004052

MSC O TCH TCH AT

S2

Trigger points See figures:. Successful external TCH to TCH handover, source BSC. Successful handover type reselection from an internal intra-cell

TCH to TCH handover to an external handover due to switchingthe circuit pool

. Successful handover type reselection from an internal inter-cellTCH to TCH handover to an external handover due to switchingthe circuit pool

. Successful external TCH TCH HSCSD handover from two to twochannels, source BSC

Description Number of attempts to outgoing TCH to TCH HOs controlled by theMSC.

Updated When the HO attempt is started.

Number

Name

Release

004053

MSC O SDCCH TCH AT

S2

Trigger points See figure External directed retry, source BSC

Description Number of attempts to outgoing SDCCH to TCH HOs controlled bythe MSC.

Updated When a directed retry procedure is started.

Feature Directed Retry

Number

Name

Release

004054

MSC O SDCCH AT

S2

Trigger points See figure Successful external SDCCH to SDCCH handover, sourceBSC

Description Number of attempts to outgoing SDCCH to SDCCH HOs controlled bythe MSC.

Updated When the HO attempt is started.

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Number

Name

Release

004055

MSC O FAIL LACK

S2

Trigger points See figures:. Unsuccessful external TCH to TCH handover due to a lack of

resources, source BSC. Unsuccessful external TCH to TCH handover because the MSC

rejects the handover due to various causes, source BSC. Unsuccessful external TCH or TCH handover, source BSC

Description Number of outgoing HOs, controlled by the MSC, that areunsuccessful because there are no radio resources available in thetarget cell.

Updated a) When no SDCCH is available in the target cell for an SDCCH HO.

b) When no TCH is available in the target cell for a TCH HO.

c) When no TCH is available in the target cell for an SDCCH to TCHHO.

d) When no terrestrial channel is available in the target cell.

e) When the GSM timer T7 expires

Impact HO failure

Reason for the impact Internal

Number

Name

Release

004056

BSC I TCH TCH

S2

Trigger points See figures:. Successful internal inter-cell TCH to TCH handover. Successful internal inter-cell TCH TCH HSCSD handover from

three to one channel. Successful internal inter-cell TCH TCH HSCSD handover from

two to three channels. Internal inter-cell direct access from the TCH on a child TRX to the

TCH on a parent TRX

Description Number of successful incoming TCH to TCH HOs controlled by theBSC.

Updated When the HO is completed.

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Number

Name

Release

004056

BSC I TCH TCH

S2

Dependencies with othercounters/PI(s)

Counter 004010 is updated along with this counter.

Number

Name

Release

Definition updated

004057

BSC I SDCCH TCH

S2

S7

Trigger points See figures:. Internal inter-cell directed retry, including feature BSS6114 TCH

assignment to the super-reuse TRX in IUO. Internal inter-cell direct access from parent DCCH to the child or

parent TRX

Description Number of successful incoming SDCCH to TCH HOs controlled bythe BSC.

Updated a) When a directed retry procedure is completed.

b) When the direct access to the super-reuse TRX is completed.

c) When the TCH assignment to the super-reuse TRX is completed.

Dependencies with othercounters/PI(s)

Counter 004010 is updated along with this counter.

Feature Directed Retry, BSS6114 TCH assignment to the super-reuse TRX inIUO and BSS7057 Direct Access to Super-Reuse TRX in IUO.

Number

Name

Release

004058

BSC I SDCCH

S2

Trigger points See figure Successful internal inter-cell SDCCH to SDCCH handover

Description Number of successful incoming SDCCH to SDCCH HOs controlled bythe BSC.

Updated When the HO is completed.

Dependencies with othercounters/PI(s)

Counter 004010 is updated along with this counter.

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Number

Name

Release

004059

BSC I TCH TCH AT

S2

Trigger points See figures:. Successful internal inter-cell TCH to TCH handover. Successful internal inter-cell TCH TCH HSCSD handover from

three to one channel. Successful internal inter-cell TCH TCH HSCSD handover from

two to three channels. Internal inter-cell direct access from the TCH on a child TRX to the

TCH on a parent TRX

Description Number of attempts to incoming TCH to TCH HOs controlled by theBSC.

Updated When the HO attempt is started.

Number

Name

Release

Definition updated

004060

BSC I SDCCH TCH AT

S2

S7

Trigger points See figures:. Internal inter-cell directed retry, including feature BSS6114 TCH

assignment to the super-reuse TRX in IUO. Internal inter-cell direct access from parent DCCH to the child or

parent TRX

Description Number of attempts to incoming SDCCH to TCH HOs controlled bythe BSC.

Updated a) When a directed retry procedure is started.

b) When the direct access to the super-reuse TRX is started.

c) When the TCH assignment to the super-reuse TRX is started.

Feature Directed Retry, BSS6114 TCH assignment to the super-reuse TRX inIUO and BSS7057 Direct Access to Super-Reuse TRX in IUO.

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Number

Name

Release

004061

BSC I SDCCH AT

S2

Trigger points See figure Successful internal inter-cell SDCCH to SDCCH handover

Description Number of attempts to incoming SDCCH to SDCCH HOs controlledby the BSC.

Updated When the HO attempt is started.

Number

Name

Release

004062

BSC I NONOPT

S2

Trigger points See figures:. Successful internal inter-cell TCH to TCH handover. Successful internal inter-cell SDCCH to SDCCH handover. Internal inter-cell directed retry, including feature BSS6114 TCH

assignment to the super-reuse TRX in IUO. Successful internal inter-cell TCH TCH HSCSD handover from

three to one channel. Successful internal inter-cell TCH TCH HSCSD handover from

two to three channels

Description Number of successful incoming HOs to a non-optimum cell controlledby the BSC.

Updated When a HO to a target cell other than the first one in the list ofcandidate target cells is completed.

Number

Name

Release

004063

BSC I NONOPT AT

S2

Trigger points See figures:. Successful internal inter-cell TCH to TCH handover. Successful internal inter-cell SDCCH to SDCCH handover. Internal inter-cell directed retry, including feature BSS6114 TCH

assignment to the super-reuse TRX in IUO. Unsuccessful internal inter-cell TCH to TCH handover due to a

lack of resources

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Number

Name

Release

004063

BSC I NONOPT AT

S2

. Unsuccessful internal inter-cell TCH to TCH handover because noradio resources are available due to switch_crc_pool

. Successful internal inter-cell TCH TCH HSCSD handover fromthree to one channel

. Successful internal inter-cell TCH TCH HSCSD handover fromtwo to three channels

Description Number of attempts to incoming HOs to a non-optimum cell controlledby the BSC.

Updated When a HO to a target cell other than the first one in the list ofcandidate target cells is started.

Number

Name

Release

004064

BSC O TCH TCH

S2

Trigger points See figures:. Successful internal inter-cell TCH to TCH handover. Successful internal inter-cell TCH TCH HSCSD handover from

three to one channel. Successful internal inter-cell TCH TCH HSCSD handover from

two to three channels. Internal inter-cell direct access from the TCH on a child TRX to the

TCH on a parent TRX

Description Number of successful outgoing TCH to TCH HOs controlled by theBSC.

Updated When the HO is completed.

Dependencies with othercounters/PI(s)

Counter 004014 is updated along with this counter.

Number

Name

Release

Definition updated

004065

BSC O SDCCH TCH

S2

S7

Trigger points See figures:

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Number

Name

Release

Definition updated

004065

BSC O SDCCH TCH

S2

S7

. Internal inter-cell directed retry, including feature BSS6114 TCHassignment to the super-reuse TRX in IUO

. Internal inter-cell direct access from parent DCCH to the child orparent TRX

Description Number of successful outgoing TCH HOs controlled by the BSC.

Updated a) When a directed retry procedure is completed.

b) When the direct access from the SDCCH to TCH on a super-reuseTRX is completed.

c) When the intelligent directed retry is completed.

d) When the TCH assignment to a super-reuse TRX is completed.

Dependencies with othercounters/PI(s)

Counter 004014 is updated along with this counter.

Feature Directed Retry, BSS6114 TCH assignment to the super-reuse TRX inIUO and BSS7057 Direct Access to Super-Reuse TRX in IUO.

Number

Name

Release

004066

BSC O SDCCH

S2

Trigger points See figure Successful internal inter-cell SDCCH to SDCCH handover

Description Number of successful outgoing SDCCH to SDCCH HOs controlled bythe BSC.

Updated When the HO is completed.

Dependencies with othercounters/PI(s)

Counter 004014 is updated along with this counter.

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Number

Name

Release

Definition updated

004067

BSC O TCH TCH AT

S2

S7

Trigger points See figures:. Successful internal inter-cell TCH to TCH handover. Successful internal inter-cell TCH TCH HSCSD handover from

three to one channel. Successful internal inter-cell TCH TCH HSCSD handover from

two to three channels. Internal inter-cell direct access from the TCH on a child TRX to the

TCH on a parent TRX

Description Number of attempts to outgoing TCH to TCH HOs controlled by theBSC.

Updated When the HO attempt is started.

Feature BSS7057 Direct Access to Super-Reuse TRX in IUO.

Number

Name

Release

Definition updated

004068

BSC O SDCCH TCH AT

S2

S7

Trigger points See figures:. Internal inter-cell directed retry, including feature BSS6114 TCH

assignment to the super-reuse TRX in IUO. Internal inter-cell direct access from parent DCCH to the child or

parent TRX

Description Number of attempts to outgoing SDCCH to TCH HOs controlled bythe BSC.

Updated a) When a directed retry procedure is started.

b) When the direct access from the SDCCH to TCH on a super-reuseTRX is started.

c) When the intelligent directed retry is started.

d) When the TCH assignment to a super-reuse TRX is started.

Feature Directed Retry, BSS6114 TCH assignment to the super-reuse TRX inIUO and BSS7057 Direct Access to Super-Reuse TRX in IUO.

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Number

Name

Release

004069

BSC O SDCCH AT

S2

Trigger points See figure Successful internal inter-cell SDCCH to SDCCH handover

Description Number of attempts to outgoing SDCCH to SDCCH HOs controlled bythe BSC.

Updated When the HO attempt is started.

Number

Name

Release

004070

BSC O NONOPT

S2

Trigger points See figures:. Successful internal inter-cell TCH to TCH handover. Successful internal inter-cell SDCCH to SDCCH handover. Internal inter-cell directed retry, including feature BSS6114 TCH

assignment to the super-reuse TRX in IUO. Successful internal inter-cell TCH TCH HSCSD handover from

three to one channel. Successful internal inter-cell TCH TCH HSCSD handover from

two to three channels

Description Number of successful outgoing HOs to a non-optimum cell controlledby the BSC.

Updated When a HO to a target cell other than the first one in the list ofcandidate target cells is completed.

Number

Name

Release

004071

BSC O NONOPT AT

S2

Trigger points See figures:. Successful internal inter-cell TCH to TCH handover. Successful internal inter-cell SDCCH to SDCCH handover. Internal inter-cell directed retry, including feature BSS6114 TCH

assignment to the super-reuse TRX in IUO. Unsuccessful internal inter-cell TCH to TCH handover due to a

lack of resources

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Number

Name

Release

004071

BSC O NONOPT AT

S2

. Unsuccessful internal inter-cell TCH to TCH handover because noradio resources are available due to switch_crc_pool

. Successful internal inter-cell TCH TCH HSCSD handover fromthree to one channel

. Successful internal inter-cell TCH TCH HSCSD handover fromtwo to three channels

Description Number of attempts to outgoing HOs to a non-optimum cell controlledby the BSC.

Updated When a HO to a target cell other than the first one in the list ofcandidate target cells is started.

Number

Name

Release

004072

BSC O FAIL LACK

S2

Trigger points See figure Unsuccessful internal inter-cell TCH to TCH handover dueto a lack of resources

Updated a) When no SDCCH is available in the target cell for an SDCCH HO.

b) When no TCH is available in the target cell for a TCH HO.

c) When no TCH is available in the target cell for an SDCCH to TCHHO.

Impact HO failure

Reason for the impact Internal

Number

Name

Release

004073

CELL TCH TCH

S2

Trigger points See figures:. Successful internal intra-cell TCH to TCH handover. Successful internal intra-cell TCH TCH HSCSD handover from

two to one channel. Successful internal intra-cell TCH TCH HSCSD handover from

one to three channels

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Number

Name

Release

004073

CELL TCH TCH

S2

Description Number of successful intra-cell (TCH to TCH) HOs.

Updated When the HO is completed.

Dependencies with othercounters/PI(s)

Counter 004018 is updated along with this counter.

Number

Name

Release

Definition updated

004074

CELL SDCCH TCH

S2

S7

Trigger points See figures:. Internal intra-cell directed retry including feature BSS6114: TCH

assignment to the super-reuse TRX in IUO. Internal intra-cell direct access from regular DCCH to a super-

reuse TRX

Description Number of successful intra-cell (SDCCH to TCH) HOs.

Updated a) When a channel assignment to a super-reuse TRX in an IUO DR iscompleted.

b) When the direct access to a super-reuse TRX is completed.

Dependencies with othercounters/PI(s)

Counter 004018 is updated along with this counter.

Feature BSS6114 TCH assignment to the super-reuse TRX in IUO andBSS7057 Direct Access to Super-Reuse TRX in IUO.

Number

Name

Release

004075

CELL SDCCH

S2

Trigger points See figure Successful internal intra-cell SDCCH to SDCCH handover

Description Number of successful intra-cell (SDCCH to SDCCH) HOs.

Updated When the HO is completed.

Dependencies with other Counter 004018 is updated along with this counter.

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Number

Name

Release

004075

CELL SDCCH

S2

counters/PI(s)

Number

Name

Release

004076

CELL TCH TCH AT

S2

Trigger points See figures:. Successful internal intra-cell TCH to TCH handover. Successful internal intra-cell TCH TCH HSCSD handover from

two to one channel. Successful internal intra-cell TCH TCH HSCSD handover from

one to three channels

Description Number of attempts to intra-cell (TCH to TCH) HOs.

Updated When the HO attempt is started.

Number

Name

Release

Definition updated

004077

CELL SDCCH TCH AT

S2

S7

Trigger points See figures:. Internal intra-cell directed retry including feature BSS6114: TCH

assignment to the super-reuse TRX in IUO. Internal intra-cell direct access from regular DCCH to a super-

reuse TRX

Description Number of attempts to intra-cell (SDCCH to TCH) HOs.

Updated a) When a channel assignment to a super-reuse TRX in an IUO DR isstarted.

b) When the direct access to a super-reuse TRX is started.

Feature BSS6114 TCH assignment to the super-reuse TRX in IUO andBSS7057 Direct Access to Super-Reuse TRX in IUO.

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Number

Name

Release

004078

CELL SDCCH AT

S2

Trigger points See figure Successful internal intra-cell SDCCH to SDCCH handover

Description Number of attempts to intra-cell (SDCCH to SDCCH) HOs.

Updated When the HO attempt is started.

Number

Name

Release

Definition updated

004079

CAUSE DIR RETRY

S2

S6

Trigger points See figures:. Internal intra-cell directed retry including feature BSS6114: TCH

assignment to the super-reuse TRX in IUO. Internal inter-cell directed retry, including feature BSS6114 TCH

assignment to the super-reuse TRX in IUO. External directed retry, source BSC

Description Number of HO attempts due to directed retry.

Feature Directed Retry, BSS6114 TCH assignment to the super-reuse TRX inIUO.

Number

Name

Release

004080

MSC I END OF HO

S2

Trigger points See figures:. Unsuccessful external TCH to TCH handover due to MS returning

to the old channel, target BSC. Unsuccessful external TCH to TCH handover, target BSC

Description Number of end of handover procedures in incoming HOs that arecontrolled by the MSC.

Updated a) When the MS returns onto the source channel.

b) When the MS is lost during the HO.

c) When the call is cleared during the HO either by the subscriber, or

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Number

Name

Release

004080

MSC I END OF HO

S2

by messages from the MS concerning

- the start of channel blocking

- the A interface speech circuits

- state changes of the BSSAP subsystem

- an abnormal release of the SCCP connection

d) When the call is cleared during the HO by a message received fromthe MSC concerning the resetting of the circuits or the BCSU restart (ifthe TCHs related to the HO are in that BCSU).

Dependencies with othercounters/PI(s)

b) Counter 004108 is updated along with this counter.

Impact HO failure

Possibly call cleared

Reason for the impact External/Abis interface

Number

Name

Release

004081

BSC I END OF HO

S2

Trigger points See figures:. Unsuccessful internal inter-cell TCH to TCH handover because a

handover is not allowed at this phase of the call. Unsuccessful internal inter-cell TCH to TCH handover due to call

clearing during handover. Unsuccessful internal inter-cell TCH to TCH handover due to a

radio link failure during handover

Description Number of end of handover procedures in the incoming HOs that arecontrolled by the BSC.

Updated a) When it is not allowed to execute a HO at the current phase of thecall.

b) When the call is cleared during the HO.

c) When the connection between the MS and the BTS is broken (onthe source channel), that is, when a message carrying an indication ofa connection failure is received (radio link failure or transcoder failure).

Dependencies with othercounters/PI(s)

a) Counter 004038 is updated along with this counter.

b) Counter 004042 is updated along with this counter.

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Number

Name

Release

004081

BSC I END OF HO

S2

c) Counter 004017 is updated along with this counter.

Impact HO failure

Possibly call cleared

Reason for the impact External/Abis interface

Number

Name

Release

004082

BSC O MS REQ ENQ PROC

S2

Description Number of MSs required in a HO candidate enquiry.

Number

Name

Release

004083

BSC I DROP CALLS

S3

Trigger points See figures:. Unsuccessful internal inter-cell TCH to TCH handover due to

losing the MS during handover. The GSM timer T3103 expires. Unsuccessful internal inter-cell TCH to TCH handover caused by

internal timer expiry or a failure in the connection of a bi-directionalspeech path

Description Number of calls that are dropped during incoming HOs controlled bythe BSC.

Updated a) When the MS is lost (timer T3103 expires).

b) When switching from a unidirectional to a bi-directional speech pathfails.

Dependencies with othercounters/PI(s)

a) Counters 004012, 004016 and 004084 are updated along with thiscounter.

b) Counters 004013, 004017 and 004084 are updated along with thiscounter.

Impact Call cleared

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Number

Name

Release

004084

BSC O DROP CALLS

S3

Trigger points See figures:. Unsuccessful internal inter-cell TCH to TCH handover due to

losing the MS during handover. The GSM timer T3103 expires. Unsuccessful internal inter-cell TCH to TCH handover caused by

internal timer expiry or a failure in the connection of a bi-directionalspeech path

Description Number of calls that are dropped during outgoing HOs controlled bythe BSC.

Updated a) When the MS is lost (timer T3103 expires).

b) When switching from a unidirectional to a bi-directional speech pathfails.

Dependencies with othercounters/PI(s)

a) Counters 004012, 004016 and 004083 are updated along with thiscounter.

b) Counters 004013, 004017 and 004083 are updated along with thiscounter.

Impact Call cleared

Number

Name

Release

004085

CELL DROP CALLS

S3

Trigger points See figure Unsuccessful internal intra-cell TCH to TCH handover dueto losing the MS during handover. The GSM timer T3107 expires

Description Number of calls dropped during intra-cell HOs.

Updated a) When the MS is lost (timer T3107 expires).

b) When switching from a unidirectional to a bi-directional speech pathfails.

Dependencies with othercounters/PI(s)

a) Counter 004020 is updated along with this counter.

b) Counter 004021 is updated along with this counter.

Impact Call cleared

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Number

Name

Release

004086

CAUSE PREEMPTION

S3

Trigger points See figures:. Successful internal intra-cell TCH to TCH handover. Successful internal inter-cell TCH to TCH handover. Successful external TCH to TCH handover, source BSC. Successful internal intra-cell SDCCH to SDCCH handover. Successful internal inter-cell SDCCH to SDCCH handover. Successful external SDCCH to SDCCH handover, source BSC

Description Number of HO attempts due to pre-emption.

Updated When a HO is started due to pre-emption.

Number

Name

Release

004087

CAUSE FIELD DROP

S4

Trigger points See figures:. Successful internal inter-cell TCH to TCH handover. Successful external TCH to TCH handover, source BSC. Successful internal inter-cell SDCCH to SDCCH handover. Successful external SDCCH to SDCCH handover, source BSC

Description Number of HO attempts caused by rapid field drop.

Updated When a HO is started due to rapid field drop.

Number

Name

Release

004088

CAUSE LOW DISTANCE

S4

Trigger points See figures:. Successful internal intra-cell TCH to TCH handover. Successful internal inter-cell TCH to TCH handover. Successful external TCH to TCH handover, source BSC. Successful internal intra-cell SDCCH to SDCCH handover. Successful internal inter-cell SDCCH to SDCCH handover. Successful external SDCCH to SDCCH handover, source BSC

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Number

Name

Release

004088

CAUSE LOW DISTANCE

S4

Description Number of HO attempts caused by low distance.

Updated When a HO is started due to low distance.

Number

Name

Release

004089

CAUSE BAD CI RATIO

S4

Trigger points See figures:. Successful internal intra-cell TCH to TCH handover. Successful internal inter-cell TCH to TCH handover. Successful internal intra-cell SDCCH to SDCCH handover. Successful internal inter-cell SDCCH to SDCCH handover

Description Number of HO attempts caused by a poor C/I ratio on the super-reusefrequency.

Updated When a HO is started due to a poor C/I ratio.

Number

Name

Release

004090

CAUSE GOOD CI RATIO

S4

Trigger points See figures:. Successful internal intra-cell TCH to TCH handover. Successful internal inter-cell TCH to TCH handover. Successful internal intra-cell SDCCH to SDCCH handover. Successful internal inter-cell SDCCH to SDCCH handover

Description Number of HO attempts caused by a good C/I ratio on the super-reusefrequency.

Updated When a HO is started due to a good C/I ratio.

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Number

Name

Release

004091

HO DUE SLOW MOV MS

S5

Trigger points See figures:. Successful internal inter-cell TCH to TCH handover. Successful external TCH to TCH handover, source BSC. Successful internal inter-cell SDCCH to SDCCH handover. Successful external SDCCH to SDCCH handover, source BSC

Description Number of HOs caused by a slowly moving MS in the macro cell.

Updated When a HO is started due to a slowly moving MS.

Number

Name

Release

004092

MSC I ATT SWITCH CIRC POOL

S5

Trigger points See figures:. Successful external TCH to TCH handover, target BSC. Successful external SDCCH to SDCCH handover, target BSC. Unsuccessful external TCH to TCH handover due to a failure in

the activation of a new channel, target BSC. Unsuccessful external TCH to TCH handover due to MS returning

to the old channel, target BSC. Unsuccessful external TCH to TCH handover because no radio

resources are available due to switch_crc_pool, target BSC. Unsuccessful external TCH to TCH handover due to a radio link

failure during handover, target BSC. Unsuccessful external TCH to TCH handover, target BSC

Description Number of HO attempts started due to the cause switch_circuit_pool

Updated When cause switch_circuit_pool is received in theHANDOVER_REQUIRED message from the A interface.

Dependencies with othercounters/PI(s)

Counter 004046 is updated along with this counter.

Feature BSS5010 Half Rate

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Number

Name

Release

004093

MSC I SUCC SWITCH CIRC POOL

S5

Trigger points See figures:. Successful external TCH to TCH handover, target BSC. Successful external SDCCH to SDCCH handover, target BSC

Description Number of successful HOs started due to the causeswitch_circuit_pool.

Updated When the HO due to the cause switch_circuit_pool from the Ainterface is completed.

Dependencies with othercounters/PI(s)

Counter 004043 is updated along with this counter.

Feature BSS5010 Half Rate

Number

Name

Release

004094

MSC O ATT SWITCH CIRC POOL

S5

Trigger points See figures:. Successful handover type reselection from an internal intra-cell

TCH to TCH handover to an external handover due to switchingthe circuit pool

. Successful handover type reselection from an internal inter-cellTCH to TCH handover to an external handover due to switchingthe circuit pool

Description Number of HO attempts started due to the cause switch_circuit_pool.

Updated When cause switch_circuit_pool is sent to the A interface in theHANDOVER_REQUIRED message.

Dependencies with othercounters/PI(s)

Counter 004052 is updated along with this counter.

Feature BSS5010 Half Rate

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Number

Name

Release

004095

MSC O SUCC SWITCH CIRC POOL

S5

Trigger points See figures:. Successful external TCH to TCH handover, source BSC. Successful external SDCCH to SDCCH handover, source BSC. Successful handover type reselection from an internal intra-cell

TCH to TCH handover to an external handover due to switchingthe circuit pool

. Successful handover type reselection from an internal inter-cellTCH to TCH handover to an external handover due to switchingthe circuit pool

Description Number of successful HOs started due to the causeswitch_circuit_pool.

Updated When the HO due to the cause switch_circuit_ pool from the Ainterface is completed.

Dependencies with othercounters/PI(s)

Counter 004049 is updated along with this counter.

Feature BSS5010 Half Rate

Number

Name

Release

004096

BSC O UNSUCC A INT CIRC TYPE

S5

Trigger points See figures:. Unsuccessful internal inter-cell TCH to TCH handover because no

radio resources are available due to switch_crc_pool. Successful handover type reselection from an internal inter-cell

TCH to TCH handover to an external handover due to switchingthe circuit pool

Description Number of outgoing HOs that are unsuccessful due to a wrong Ainterface circuit type.

Updated When an internal outgoing inter-cell HO attempt is interruptedbecause the BSC wants to change the A interface circuit pool beforeTCH allocation.

Dependencies with othercounters/PI(s)

Counter 004097 is updated along with this counter.

Feature BSS5010 Half Rate

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Number

Name

Release

004096

BSC O UNSUCC A INT CIRC TYPE

S5

Impact HO failure

Reason for the impact External /A interface

Number

Name

Release

004097

BSC I UNSUCC A INT CIRC TYPE

S5

Trigger points See figures:. Unsuccessful internal inter-cell TCH to TCH handover because no

radio resources are available due to switch_crc_pool. Successful handover type reselection from an internal inter-cell

TCH to TCH handover to an external handover due to switchingthe circuit pool

Description Number of incoming HOs that are unsuccessful due to a wrong Ainterface circuit type.

Updated When an internal incoming inter-cell HO attempt is interruptedbecause the BSC wants to change the A interface circuit pool beforeTCH allocation.

Dependencies with othercounters/PI(s)

Counter 004096 is updated along with this counter.

Feature BSS5010 Half Rate

Impact HO failure

Reason for the impact External /A interface

Number

Name

Release

004098

INT UNSUCC A INT CIRC TYPE

S5

Trigger points See figures:. Unsuccessful internal intra-cell TCH to TCH handover because no

radio resources are available due to switch_crc_pool. Successful handover type reselection from an internal intra-cell

TCH to TCH handover to an external handover due to switchingthe circuit pool

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Number

Name

Release

004098

INT UNSUCC A INT CIRC TYPE

S5

Description Number of HOs unsuccessful due to a wrong A interface circuit type.

Updated When an internal intra-cell HO attempt is interrupted because theBSC wants to change the A interface circuit pool before TCHallocation.

Feature BSS5010 Half Rate

Impact HO failure

Reason for the impact External /A interface

Number

Name

Release

004099

HO ATT DUE SWITCH CIRC POOL

S5

Trigger points See figures:. Successful external TCH to TCH handover, source BSC. Successful external SDCCH to SDCCH handover, source BSC. Successful handover type reselection from an internal intra-cell

TCH to TCH handover to an external handover due to switchingthe circuit pool

. Successful handover type reselection from an internal inter-cellTCH to TCH handover to an external handover due to switchingthe circuit pool

Description Number of HO attempts started in order to change the A interfacecircuit type.

Feature BSS5010 Half Rate

Number

Name

Release

004100

MSC O ADJ CELL ID ERR

S5

Trigger points See figures:. Unsuccessful external TCH to TCH handover because the MSC

rejects the handover due to various causes, source BSC. Unsuccessful external TCH to TCH handover due to adjacent cell

error, source BSC

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Number

Name

Release

004100

MSC O ADJ CELL ID ERR

S5

Description Number of errors in adjacent cell identification.

Updated a) When the BSC notices that the target cell information (BCCHfrequency and/or BSIC) received in the HANDOVER_COMMANDmessage from the MSC differs from that in the source BSDATA (BSSRadio Network Configuration Database).

b) When the MSC rejects the HO attempt due to the cause invalid_cellduring a HO from SDCCH to TCH or from TCH to TCH .

Feature BSS5370 Target Cell Identifier Checking in External HO

Impact HO failure

Reason for the impact Internal. Information on the adjacent cells is incorrect in the BSSRadio Network Configuration Database in the source BSC

Number

Name

Release

004101

MSC I UNSUCC DUE A IF CRC

S5

Trigger points See figure Unsuccessful external TCH to TCH handover because noradio resources are available due to switch_crc_pool, target BSC

Description Number of incoming unsuccessful HOs due to a wrong A interfacecircuit type.

Updated When the HO attempt ends as a result of a TCH allocation attemptwhich is unsuccessful because of a mismatch between the requestedTCH channel type and the A interface circuit type. The causeswitch_circuit_pool is sent in the HANDOVER_FAILURE message tothe A interface.

Feature BSS5010 Half Rate

Impact HO failure

Reason for the impact External /A interface

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Number

Name

Release

004102

MSC O UNSUCC DUE A IF CRC

S5

Trigger points See figure Unsuccessful external TCH to TCH handover because theMSC rejects the handover due to various causes, source BSC

Description Number of HOs that are unsuccessful because of a wrong A interfacecircuit type.

Updated When an external HO attempt ends with the A interface causescircuit_pool_mismatch or switch_ circuit_pool.

This counter is updated also when a HO attempt initiated by the BSCis interrupted because there is no proper circuit pool or there is no freeA interface circuit available in the proper pool.

Feature BSS5010 Half Rate

Impact HO failure

Reason for the impact External /A interface

Number

Name

Release

004103

HO FROM NORMAL TO EXT AREA

S6

Description Number of HOs from normal area to extended area.

Updated When internal intra-cell HO start reason is cause DISTANCE (4027)and the HO is attempted from normal area to extended area.

Feature BSS6037: Improved Solution for Extended Cell

Number

Name

Release

004104

HO FROM EXT TO NORMAL AREA

S6

Description Number of HOs from extended area to normal area.

Updated When internal intra-cell HO is started as a result of the causeLOW_DISTANCE (4088) and the HO attempt is from extended area tonormal area.

Feature BSS6037: Improved Solution for Extended Cell

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Number

Name

Release

004105

HO DUE TO MS SLOW SPEED

S6

Trigger points See figures:. Successful internal inter-cell TCH to TCH handover. Successful external TCH to TCH handover, source BSC. Successful internal inter-cell SDCCH to SDCCH handover. Successful external SDCCH to SDCCH handover, source BSC

Description HO due to a detected low speed MS.

Updated When an internal inter-cell or external HO attempt is started becausethe speed of the MS is below the threshold value LSL (Lower SpeedLimit).

Feature BSS6083: MS Speed Detection

Number

Name

Release

004106

HO DUE TO MS HIGH SPEED

S6

Trigger points See figures:. Successful internal inter-cell TCH to TCH handover. Successful external TCH to TCH handover, source BSC. Successful internal inter-cell SDCCH to SDCCH handover. Successful external SDCCH to SDCCH handover, source BSC

Description HO due to a detected high speed MS.

Updated When an internal inter-cell or external HO attempt is started becausethe speed of the MS has exceeded the threshold value USL (UpperSpeed Limit).

Feature BSS6083: MS Speed Detection

Number

Name

Release

004107

MSC O CALL DROP DURING HO

S7

Trigger points See figure Unsuccessful external TCH to TCH handover due to GSMtimer T8 expiry, source BSC

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Number

Name

Release

004107

MSC O CALL DROP DURING HO

S7

Description Number of calls that are dropped during external HOs, afterHANDOVER_COMMAND is received from the MSC.

Updated a) When a call is dropped during an external HO and after the BSChas received a HANDOVER_COMMAND message.

b) When either the GSM timer T8 expires, or the MSC sends aCLEAR_COMMAND message to the BSC with other cause than callcontrol or handover successful.

Dependencies with othercounters/PI(s)

Counter 004007 is updated along with this counter.

Feature BSS7042 Measurement improvements

Impact Call cleared

Number

Name

Release

004108

MSC I CALL POSS DROP DURING HO

S7

Trigger points See figure Unsuccessful external TCH to TCH handover, target BSC

Description Number of failures (the call may possibly be dropped) during externalHOs, after the HO_REQUEST_ ACK message is sent to the MSC.

Updated a) When a call is possibly dropped during an external HO, after theHO_REQUEST_ACK message is sent to the MSC.

b) When the GSM timer T9113 expires or the MSC sends aCLEAR_COMMAND message to the BSC with some other causethan call control or radio interface failure revision to old channel.

Dependencies with othercounters/PI(s)

Counter 004080 is updated along with this counter.

Feature BSS7042 Measurement improvements

Impact Possibly call cleared

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Number

Name

Release

004109

HO ATT DUE TO BAD RXLEV ON SUPER

S7

Trigger points See figure Successful internal intra-cell TCH to TCH handover

Description Number of HO attempts due to a Bad Rxlevel on a super-reusefrequency.

Updated When a HO is started due to a Bad Rxlevel on the super-reusefrequency.

Feature BSS7064 ICE handover support

Number

Name

Release

004110

HO ATT DUE TO GOOD RXLEV ON REGULAR

S7

Trigger points See figure Successful internal intra-cell TCH to TCH handover

Description Number of HO attempts due to a Good Rxlevel on a regularfrequency.

Updated When a HO is started due to a Good Rxlevel on the regular frequency.

Feature BSS7064 ICE handover support

Number

Name

Release

004111

HO ATT DUE ERFD

S7

Trigger points See figures:. Successful internal inter-cell TCH to TCH handover. Successful external TCH to TCH handover, source BSC. Successful internal inter-cell SDCCH to SDCCH handover. Successful external SDCCH to SDCCH handover, source BSC

Description Number of inter-cell HO attempts during an ERFD (Enhanced RapidField Drop) HO. All inter-cell HOs during ERFD HO are mapped to theERFD HO counter.

Updated When a HO is started due to ERFD.

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Number

Name

Release

004111

HO ATT DUE ERFD

S7

Feature BSS7031 Rapid field drop improvement

Number

Name

Release

004112

MSC O ATT FOR HSCSD

S7

Trigger points See figure Successful external TCH TCH HSCSD handover from twoto two channels, source BSC

Description Number of outgoing HO attempts for HSCSD calls controlled by theMSC.

Updated When a HO attempt for HSCSD connection is started.

Dependencies with othercounters/PI(s)

Counter 004052 or 004053 will also be updated.

Feature BSS7003, BSS7037 HSCSD and 14.4 kbit/s data services

Number

Name

Release

004113

MSC O SUCC FOR HSCSD

S7

Trigger points See figure Successful external TCH TCH HSCSD handover from twoto two channels, source BSC

Description Number of successful outgoing HOs for HSCSD calls controlled bythe MSC.

Updated When a HO attempt for HSCSD connection is completed.

Dependencies with othercounters/PI(s)

Counter 004049 or 004050 and counter 004004 will also be updated.

Feature BSS7003, BSS7037 HSCSD and 14.4 kbit/s data services

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Number

Name

Release

004114

MSC I ATT FOR HSCSD

S7

Trigger points See figures:. Successful external TCH TCH HSCSD handover from four to one

channel, target BSC. Successful external TCH TCH HSCSD handover from one to two

channels, target BSC

Description Number of incoming HO attempts for HSCSD calls controlled by theMSC.

Updated When a HO attempt for a multichannel connection is started.

Dependencies with othercounters/PI(s)

Counter 004046 or 004047 will also be updated.

Feature BSS7003, BSS7037 HSCSD and 14.4 kbit/s data services

Number

Name

Release

004115

MSC I SUCC FOR HSCSD

S7

Trigger points See figures:. Successful external TCH TCH HSCSD handover from four to one

channel, target BSC. Successful external TCH TCH HSCSD handover from one to two

channels, target BSC

Description Number of successful incoming HOs for HSCSD calls controlled bythe MSC.

Updated When a HO attempt for a multichannel connection is completed.

Dependencies with othercounters/PI(s)

Counter 004043 or 004044 and counter 004000 will also be updated.

Feature BSS7003, BSS7037 HSCSD and 14.4 kbit/s data services

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Number

Name

Release

004116

MSC I SUCC INC FOR HSCSD

S7

Trigger points See figure Successful external TCH TCH HSCSD handover from oneto two channels, target BSC

Description The number of channels in an MSC-controlled HO for an outgoingHSCSD call has increased.

Updated When a current channel IE is included in the HANDOVER_REQUESTmessage and the number of allocated channels is greater in the targetcell than in the source cell.

Feature BSS7003, BSS7037 HSCSD and 14.4 kbit/s data services

Number

Name

Release

004117

MSC I SUCC DEC FOR HSCSD

S7

Trigger points See figure Successful external TCH TCH HSCSD handover from fourto one channel, target BSC

Description The number of channels in an MSC-controlled HO for an outgoingHSCSD call has decreased.

Updated When a current channel IE is included in the HANDOVER_REQUESTmessage and the number of allocated channels in the target cell islower than in the source cell.

Feature BSS7003, BSS7037 HSCSD and 14.4 kbit/s data services

Number

Name

Release

004118

BSC O ATT FOR HSCSD

S7

Trigger points See figures:. Successful internal inter-cell TCH TCH HSCSD handover from

three to one channel. Successful internal inter-cell TCH TCH HSCSD handover from

two to three channels

Description Number of outgoing HO attempts for HSCSD calls controlled by theBSC.

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Number

Name

Release

004118

BSC O ATT FOR HSCSD

S7

Updated When a HO attempt for a multichannel connection is started.

Dependencies with othercounters/PI(s)

Counter 004067 or 004068 will also be updated.

Feature BSS7003, BSS7037 HSCSD and 14.4 kbit/s data services

Number

Name

Release

004119

BSC O SUCC FOR HSCSD

S7

Trigger points See figures:. Successful internal inter-cell TCH TCH HSCSD handover from

three to one channel. Successful internal inter-cell TCH TCH HSCSD handover from

two to three channels

Description Number of successful outgoing HOs for HSCSD calls controlled bythe BSC.

Updated When a HO attempt for multichannel connection is completed.

Dependencies with othercounters/PI(s)

Counter 004064 or 004065 and counter 004014 will also be updated.

Feature BSS7003, BSS7037 HSCSD and 14.4 kbit/s data services

Number

Name

Release

004120

BSC I ATT FOR HSCSD

S7

Trigger points See figures:. Successful internal inter-cell TCH TCH HSCSD handover from

three to one channel. Successful internal inter-cell TCH TCH HSCSD handover from

two to three channels

Description Number of incoming HO attempts for HSCSD calls controlled by theBSC.

Updated When a HO attempt for a multichannel connection is started.

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Number

Name

Release

004120

BSC I ATT FOR HSCSD

S7

Dependencies with othercounters/PI(s)

Counter 004059 or 004060 will also be updated.

Feature BSS7003, BSS7037 HSCSD and 14.4 kbit/s data services

Number

Name

Release

004121

BSC I SUCC FOR HSCSD

S7

Trigger points See figures:. Successful internal inter-cell TCH TCH HSCSD handover from

three to one channel. Successful internal inter-cell TCH TCH HSCSD handover from

two to three channels

Description Number of successful incoming HOs for HSCSD calls controlled bythe BSC.

Updated When a HO attempt for a multichannel connection is completed.

Dependencies with othercounters/PI(s)

Counter 004056 or 004057 and counter 004010 will also be updated.

Feature BSS7003, BSS7037 HSCSD and 14.4 kbit/s data services

Number

Name

Release

004122

BSC I SUCC INC FOR HSCSD

S7

Trigger points See figure Successful internal inter-cell TCH TCH HSCSD handoverfrom two to three channels

Description The number of channels in an BSC-controlled HO for an outgoingHSCSD call has increased.

Updated When a number of allocated channels in the target cell is greater thanin the source cell.

Feature BSS7003, BSS7037 HSCSD and 14.4 kbit/s data services

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Number

Name

Release

004123

BSC I SUCC deC FOR HSCSD

S7

Trigger points See figure Successful internal inter-cell TCH TCH HSCSD handoverfrom three to one channel

Description The number of channels in an BSC-controlled HO for an outgoingHSCSD call has decreased.

Updated When a number of allocated channels in the target cell is lower than inthe source cell.

Feature BSS7003, BSS7037 HSCSD and 14.4 kbit/s data services

Number

Name

Release

004124

INTRA ATT FOR HSCSD

S7

Trigger points See figures:. Successful internal intra-cell TCH TCH HSCSD handover from

two to one channel. Successful internal intra-cell TCH TCH HSCSD handover from

one to three channels

Description Number of intra-cell HO attempts for HSCSD calls.

Updated When a HO attempt for multichannel connection is started.

Dependencies with othercounters/PI(s)

Counter 004076 or 004077 will also be updated.

Feature BSS7003, BSS7037 HSCSD and 14.4 kbit/s data services

Number

Name

Release

004125

INTRA SUCC FOR HSCSD

S7

Trigger points See figures:. Successful internal intra-cell TCH TCH HSCSD handover from

two to one channel. Successful internal intra-cell TCH TCH HSCSD handover from

one to three channels

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Name

Release

004125

INTRA SUCC FOR HSCSD

S7

Description Number of successful intra-cell HOs for HSCSD calls.

Updated When a HO attempt for multichannel connection is completed.

Dependencies with othercounters/PI(s)

Counter 004073 or 004074 and counter 004018 will also be updated.

Feature BSS7003, BSS7037 HSCSD and 14.4 kbit/s data services

Number

Name

Release

004126

INTRA SUCC INC FOR HSCSD

S7

Trigger points See figure Successful internal intra-cell TCH TCH HSCSD handoverfrom one to three channels

Description The number of channels in intra-cell HOs for an HSCSD call hasincreased.

Updated When the number of allocated channels in the target TRX is greaterthan in the source TRX.

Feature BSS7003, BSS7037 HSCSD and 14.4 kbit/s data services

Number

Name

Release

004127

INTRA SUCC DEC FOR HSCSD

S7

Trigger points See figure Successful internal intra-cell TCH TCH HSCSD handoverfrom two to one channel

Description The number of channels in intra-cell HOs for a HSCSD call hasdecreased.

Updated When a number of allocated channels in the target TRX is lower thanin the source TRX.

Feature BSS7003, BSS7037 HSCSD and 14.4 kbit/s data services

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Number

Name

Release

004128

HO ATT DUE TO DIRECT ACCESS

S7

Trigger points See figures:. Internal intra-cell direct access from regular DCCH to a super-

reuse TRX. Internal inter-cell direct access from parent DCCH to the child or

parent TRX

Description Number of direct access attempts.

In the HO measurement, an intra-cell direct access is considered anintra-cell HO and correspondingly, an inter-cell direct access isconsidered an inter-cell HO.

Updated When a HO is started with the cause direct access

Feature BSS7057 Direct access to super reuse TRX in IUO

Number

Name

Release

004129

HO ATT DUE TO DADLB

S8

Trigger points See figure Handover attempt due to DADL/B

Description This counter is updated when a handover attempt is started due toDirect Access to Desired Layer/Band (DADL/B).

Updated When a HO is started with the cause DADL/B.

Feature BSS8032 Direct Access to Desired Layer/Band

Number

Name

Release

004130

HO ATT DUE TO GPRS

S9

Trigger points See figure Successful internal intra-cell TCH to TCH handover

Description This counter is updated when a handover attempt is started due toGPRS channel allocation.

Updated When a HO is started with the request of the radio resource managerin order to enable an upgrade to the GPRS territory.

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Number

Name

Release

004130

HO ATT DUE TO GPRS

S9

NOTE! This counter may show some values even if there has been noGPRS Traffic. Since the GPRS Territory method operates accordingto CS Traffic, this may cause upgrades and downgrades to the GPRSTerritory and subsequently cause handovers to CS Calls triggeringthis counter.

Feature BSS9006 GPRS Telecom in BCSU and MCMU

Number

Name

Release

004131

INTRA CELL SUCCESS SDCCH HO BETWEEN BTSS

S10

Description Number of completed and successful SDCCH-SDCCH handoversbetween two BTSs of the segment.

Updated At the target BTS when the call has been successfully transferred tothe target SDCCH.

Feature BSS10016 Common BCCH Control

BSS10046 Multi BCF Control

Number

Name

Release

004132

INTRA CELL SUCCESS TCH HO BETWEEN BTSS

S10

Description Number of completed and successful TCH to TCH handoversbetween the BTSs of the segment.

Updated At the target BTS when the call has been successfully transferred tothe target TCH.

Feature BSS10016 Common BCCH Control

BSS10046 Multi BCF Control

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Number

Name

Release

004133

HO ATTEMPT INTER BAND SDCCH

S10

Description Number of attempts to perform an SDCCH-SDCCH handover, basedon the duration of an SDCCH reservation, from a BTS on the BCCHfrequency band to a BTS on another frequency band of the segment.

Updated At the source BTS on BCCH frequency band whenever a handoverattempt is made to move a call to an SDCCH on another frequencyband of the segment. PGSM 900 and EGSM 900 are here regardedas different bands.

Dependencies with othercounters/PI(s)

Information on the success of the attempts can be seen on BSC levelin counter 051136.

Feature BSS10016 Common BCCH Control

Number

Name

Release

004134

INTRA CELL SUCCESS SDCCH HO BETWEEN BANDS

S10

Description Number of completed and successful SDCCH-SDCCH handoversbetween two BTSs on different frequency bands of a segment. PGSM900 and EGSM 900 are regarded as parts of the same GSM 900frequency band.

Updated At the target BTS when the call has been successfully transferred tothe target SDCCH.

Dependencies with othercounters/PI(s)

Counter 004131 is updated along with this counter.

Feature BSS10016 Common BCCH Control

Number

Name

Release

004135

HO ATTEMPT INTER BAND TCH

S10

Description Number of attempts to perform a TCH to TCH handover betweenBTSs on different frequency bands of a segment due to load.

Updated At the source BTS whenever a handover is initiated in order to move acall to another band of the segment and, as a result, to decrease theload of the source BTS. PGSM 900 and EGSM 900 are regarded here

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Number

Name

Release

004135

HO ATTEMPT INTER BAND TCH

S10

as different bands.

Dependencies with othercounters/PI(s)

Information on the success of the attempts can be seen on BSC levelin counter 051135.

Feature BSS10016 Common BCCH Control

Number

Name

Release

004136

INTRA CELL SUCCESS TCH HO BETWEEN BANDS

S10

Description Number of completed and successful TCH to TCH handoversbetween two BTSs on different frequency bands of a segment. PGSM900 and EGSM 900 are regarded as parts of the same GSM 900frequency band.

Updated At the target BTS when the call has been successfully transferred tothe target TCH between GSM 900 and GSM 1800 bands in eitherdirection.

Dependencies with othercounters/PI(s)

Counter 004132 is updated along with this counter.

Feature BSS10016 Common BCCH Control

Number

Name

Release

Definition updated

004137

HO ATTEMPT INTER BTS TYPE SDCCH

S10

S11

Description Number of attempts to perform an SDCCH to SDCCH handover,based on the duration of an SDCCH reservation, from a BTS of somebase station site type to a BTS of another type within a segment.

Updated At the source BTS whenever an attempt is made to move a call froman SDCCH in a BTS of some base station site type to an SDCCH in aBTS of another type in the segment, based on the duration of thesource SDCCH reservation. Note that this counter is not updatedwhen the handover attempt is made between the resources ofdifferent base station site types if the resources are also of differentfrequency bands. In such cases counter 004133 is updated instead.

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Name

Release

Definition updated

004137

HO ATTEMPT INTER BTS TYPE SDCCH

S10

S11

Dependencies with othercounters/PI(s)

Information on the success of the attempts on BSC level can be seenin counter 051148.

Feature BSS10046 Multi BCF Control

Number

Name

Release

004138

INTRA CELL SUCCESS SDCCH HO BETWEEN BTSTYPES

S10

Description Number of completed and successful SDCCH to SDCCH handoversfrom a BTS of one base station site type to a BTS of another typewithin a segment.

Updated At the target BTS when the call has been successfully transferred tothe target SDCCH and the handover was between BTSs of differentbase station site types within a segment.

Dependencies with othercounters/PI(s)

Counter 004131 is updated along with this counter.

Feature BSS10046 Multi BCF Control

Number

Name

Release

004139

HO ATTEMPT INTER BTS TYPE TCH

S10

Description Number of attempts to perform a TCH to TCH handover betweendifferent BTS types due to load reasons within a segment.

Updated At the source BTS whenever an attempt is made to move a callbetween different BTS types in order to decrease the load of thesource BTS.

Dependencies with othercounters/PI(s)

Information on the success of the attempts on BSC level can be seenin counter 051147.

Feature BSS10046 Multi BCF Control

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Number

Name

Release

004140

INTRA CELL SUCCESS TCH HO BETWEEN BTS TYPES

S10

Description Number of completed and successful TCH to TCH handovers from aBTS of one base station site type to a BTS of another type within asegment.

Updated At the target BTS when the call has been successfully transferred tothe target TCH and the handover was between BTSs of different basestation site types within a segment.

Dependencies with othercounters/PI(s)

Counter 004132 is updated along with this counter.

Feature BSS10046 Multi BCF Control

Number

Name

Release

004141

HO ATT DUE TO HSCSD

S10

Description Number of intra cell handover attempts that are made due to theHSCSD traffic.

Updated When an intra cell handover attempt is initiated for a single slot call inorder to enable an upgrade for an GSCSD call.

Feature BSS7003 High Speed Circuit-Switched Data

Number

Name

Release

004142

HO ATT FOR AMR TO HR

S10

Description Number of HO attempts from AMR FR to AMR HR.

Updated When a channel rate change HO attempt for AMR FR call is started.

Feature BSS10004 Adaptive Multi Rate Codec

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Number

Name

Release

004143

HO ATT FOR AMR TO FR

S10

Description Number of HO attempts from AMR HR to AMR FR.

Updated When a channel rate change HO attempt for AMR HR call is started.

Feature BSS10004 Adaptive Multi Rate Codec

Number

Name

Release

004144

MSC I TCH HO FROM WCDMA RAN ATTEMPT

S10.5

Description Number of incoming (WCDMA RAN to GSM) inter-system handoverattempts.

Updated When the HO attempt from WCDMA RAN to GSM is started.

Feature GSM-WCDMA Inter-System Handover

Number

Name

Release

004145

MSC I WCDMA RAN HO ATTEMPT UNSUCC DUE LACK

S10.5

Description Number of incoming (WCDMA RAN to GSM) handover requestsrejected by the BSC due to lack of resources.

Updated No channel is available for a HO and the HANDOVER_FAILUREmessage is sent to the MSC when WCDMA RAN to GSM handoverhas been requested.

Feature GSM-WCDMA Inter-System Handover

Number

Name

Release

004146

MSC I WCDMA RAN HO ATTEMPT UNSUCC DUE BSSPROBLEM

S10.5

Description Number of incoming (WCDMA RAN to GSM) handovers which areunsuccessful due to BSS problems.

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Number

Name

Release

004146

MSC I WCDMA RAN HO ATTEMPT UNSUCC DUE BSSPROBLEM

S10.5

Updated Radio channel activation fails and the HANDOVER_FAILUREmessage is sent to the MSC when WCDMA RAN to GSM handoverhas been requested.

Feature GSM-WCDMA Inter-System Handover

Number

Name

Release

004147

MSC I WCDMA RAN END OF HO

S10.5

Description Number of the end of inter-system handover procedures in incoming(WCDMA RAN to GSM) HOs.

Updated When the call is cleared during the HO by a message received fromthe MSC concerning resetting the circuits or the BSCU restart (if theTCHs related to the HO are in that BCSU).

This may occur in the following situations:. MS returns to the source channel. MS is lost during the HO. Call is cleared during the HO either by the subscriber or by

messages from the MS concerning

- the start of channel blocking

-the A interface speech circuits

- state changes of the BSSAP subsystem

-abnormal release of the SCCP connection

Feature GSM-WCDMA Inter-System Handover

Number

Name

Release

004148

MSC I UNSUCCESS HO WCDMA RAN DUE CONN

S10.5

Description Number of incoming (WCDMA RAN to GSM) Inter-System HOs whichare unsuccessful due to a connection failure.

Updated When the connection between the MS and the BTS is broken (on thetarget channel), that is, when a message carrying an indication of a

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Name

Release

004148

MSC I UNSUCCESS HO WCDMA RAN DUE CONN

S10.5

connection failure is received (radio link failure or transcoder failure).

Feature GSM-WCDMA Inter-System Handover

Number

Name

Release

004149

MSC I HO WCDMA RAN TCH SUCCESS

S10.5

Description Number of successfully completed incoming (WCDMA RAN to GSM)handovers.

Updated When the inter-system handover (WCDMA RAN to GSM) isacknowledged and completed, that is,. theHANDOVER_REQUEST_ACKNOWLEDGE and theHANDOVER_COMPLETED messages are sent to the MSC.

Feature GSM-WCDMA Inter-System Handover

Number

Name

Release

004150

MSC O TCH HO TO WCDMA RAN ATTEMPT

S10.5

Description Number of outgoing (GSM to WCDMA RAN) HO attempts controlledby the MSC. Signal strength (Ec/No) and the load of the serving GSMcell are above the thresholds.

Updated The HANDOVER_REQUIRED message is sent to the MSC and theHO attempt is started.

Feature GSM-WCDMA Inter-System Handover

Number

Name

Release

004151

MSC O HO TO WCDMA RAN NOT ALLOWED

S10.5

Description Number of outgoing (GSM to WCDMA RAN) inter-system HOscontrolled by the MSC which are unsuccessful because Hos are notallowed.

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Number

Name

Release

004151

MSC O HO TO WCDMA RAN NOT ALLOWED

S10.5

Updated The BSC does not send the HANDOVER_REQUIRED message tothe MSC.

When it is not allowed to execute an inter-system HO in the currentphase of the call in progress.

Feature GSM-WCDMA Inter-System Handover

Number

Name

Release

004152

MSC O END OF HO TO WCDMA RAN DUE BSS

S10.5

Description Number of the end of outgoing (GSM to WCDMA RAN) handoverprocedures due to BSS problems (outgoing HO controlled by theMSC).

Updated When the connection between the MS and the BTS is broken (on thesource channel), that is, when a message carrying an indication ofconnection failure is received (radio link failure or transcoder failure).

The counter is updated for

-non-transparent data calls

-transparent data calls

-speech calls

Feature GSM-WCDMA Inter-System Handover

Number

Name

Release

004153

MSC O GEN INTER SYSTEM TO WCDMA RAN HANDOVERREQ MESSAGES

S10.5

Description Total number of the HANDOVER_REQUIRED messages generatedby outgoing (GSM to WCDMA RAN) inter-system HOs controlled bythe MSC.

Updated When the BSC sends the HANDOVER_REQUIRED message to theMSC.

The counter is updated for

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Number

Name

Release

004153

MSC O GEN INTER SYSTEM TO WCDMA RAN HANDOVERREQ MESSAGES

S10.5

-non-transparent data calls

-transparent data calls

-speech calls

Feature GSM-WCDMA Inter-System Handover

Number

Name

Release

004154

MSC O GEN INTER SYSTEM TO WCDMA RAN HANDOVERCOM MESSAGES

S10.5

Description Number of theINTER_SYSTEM_HANDOVER_TO_WCDMA_RAN_COMMANDmessages generated by outgoing (GSM to WCDMA RAN) inter-system HOs controlled by the MSC.

Updated When HANDOVER COMMAND is sent to the MS

The counter is updated for

-non-transparent data calls

-transparent data calls

-speech calls

Feature GSM-WCDMA Inter-System Handover

Number

Name

Release

004155

MSC O TO WCDMA RAN FAIL LACK

S10.5

Description Number of outgoing (GSM to WCDMA RAN) inter-system HOscontrolled by the MSC which are unsuccessful due to no radioresources available in the target cell.

Updated The BSC has received the HANDOVER_REQUIRED_REJECT

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Number

Name

Release

004155

MSC O TO WCDMA RAN FAIL LACK

S10.5

message from the MSC

-when no channel is available in the target cell for an HO

-when the GSM timer T7 expires.

The counter is updated for

-non-transparent data calls

-transparent data calls

-speech calls

Feature GSM-WCDMA Inter-System Handover

Number

Name

Release

004156

MSC O END OF HO TO WCDMA RAN

S10.5

Description Number of the end of handover procedures for outgoing (GSM toWCDMA RAN) HO controlled by the MSC.

Updated -When the GSM timer T3121 expires (the CLEAR_COMMANDmessage not received).

-When the HO is rejected with the cause differing from the causecip_type_mismatch, or invalid_cell, T7 expiry, no radio resourceavailable or no terrestrial channel available in the target cell.

-When the MSC sends a CLEAR_COMMAND message with anotherreason than handover successful or call control to the BSC.

- Internal conflict with the A interface.

The counter is updated for

-non-transparent data calls

-transparent data calls

-speech calls

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Name

Release

004156

MSC O END OF HO TO WCDMA RAN

S10.5

Feature GSM-WCDMA Inter-System Handover

Number

Name

Release

004157

MSC O CALL DROP DURING HO TO WCDMA RAN

S10.5

Description Number of dropped calls during outgoing (GSM to WCDMA RAN) HOsafter HANDOVER COMMAND is received from the MSC.

Updated -When a call is dropped during an external HO after the BSC hasreceived a HANDOVER_COMMAND message. That is,

-When either the GSM timer T8 expires

-When the MSC sends a CLEAR_COMMAND message to the BSCwith other cause than call control or handover successful.

The counter is updated for

-non-transparent data calls

-transparent data calls

-speech calls

Feature GSM-WCDMA Inter-System Handover

Number

Name

Release

004158

MSC O TO WCDMA RAN SUCCESS TCH HO

S10.5

Description Number of successful outgoing (GSM to WCDMA RAN) HOscontrolled by the MSC.

Updated When the inter-system HO is completed and BSC has receivedCLEAR_COMMAND from the MSC.

The counter is updated for

-non-transparent data calls

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Number

Name

Release

004158

MSC O TO WCDMA RAN SUCCESS TCH HO

S10.5

-transparent data calls

-speech calls

Feature GSM-WCDMA Inter-System Handover

Number

Name

Release

004159

SUCCESSFUL HO INTER BAND TCH

S10.5

Description Number of successful and completed TCH-TCH handovers betweenBTSs of different frequency bands of a segment due to load.

Updated At the target BTS when the call has been successfully transferred tothe target TCH.

Dependencies with othercounters/PI(s)

Counter 004135 is updated in the source BTS of the handover.

Feature BSS10016 PGSM900/EGSM900/GSM1800 Common BCCH,BSS10087 GSM/EDGE 800/1900 Common BCCH

Number

Name

Release

004160

SUCCESSFUL HO INTER BTS TYPE TCH

S10.5

Description Number of successful and completed TCH-TCH handovers betweendifferent BTS types of a segment due to load.

Updated At the target BTS when the call has been successfully transferred tothe target TCH.

Dependencies with othercounters/PI(s)

Counter 004139 is updated in the source BTS of the handover.

Feature BSS10046 Multi BCF Control

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Number

Name

Release

004161

UNSUCCESSFUL HO INTER BAND TCH

S10.5

Description Number of unsuccessful TCH-TCH handovers between BTSs ofdifferent frequency bands of a segment due to load.

Updated At the source BTS.

Dependencies with othercounters/PI(s)

Counter 004135 is updated in the source BTS of the handover.

Feature BSS10016 PGSM900/EGSM900/GSM1800 Common BCCH,BSS10087 GSM/EDGE 800/1900 Common BCCH

Number

Name

Release

004162

UNSUCCESSFUL HO INTER BTS TYPE TCH

S10.5

Description Number of unsuccessful TCH-TCH handovers between different BTStypes of a segment due to load.

Updated At the source BTS.

Dependencies with othercounters/PI(s)

Counter 004139 is updated in the source BTS of the handover.

Feature BSS10046 Multi BCF Control

Number

Name

Release

004163

HO ATTEMPT INTER BAND DUE LEVEL

S10.5

Description Number of attempts to perform a TCH-TCH handover from non-BCCHlayer between BTSs on different frequency bands of a segment due toweak downlink signal level.

Updated At the source BTS whenever a handover is initiated to move a call toanother band of the segment due to weak downlink signal level.PGSM 900 and EGSM 900 are regarded here as different bands.

Dependencies with othercounters/PI(s)

Success of the attempts can be seen on BSC level in counter 051135

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Number

Name

Release

004163

HO ATTEMPT INTER BAND DUE LEVEL

S10.5

Feature BSS10016 PGSM900/EGSM900/GSM1800 Common BCCH,BSS10087 GSM/EDGE 800/1900 Common BCCH

Number

Name

Release

004164

UNSUCC HO INTER BAND DUE LEVEL

S10.5

Description Number of unsuccessful attempts to perform a TCH-TCH handoverfrom non-BCCH layer between BTSs on different frequency bands of asegment due to weak downlink signal level.

Updated At the source BTS when a handover to move a call to another band ofthe segment due to weak downlink signal level fails. PGSM 900 andEGSM 900 are regarded here as different bands.

Dependencies with othercounters/PI(s)

Counter 004169 is updated in the source BTS.

Feature BSS10016 PGSM900/EGSM900/GSM1800 Common BCCH,BSS10087 GSM/EDGE 800/1900 Common BCCH

Number

Name

Release

004165

SUCC HO INTER BAND DUE LEVEL

S10.5

Description Number of successful attempts to perform a TCH-TCH handover fromnon-BCCH layer between BTSs on different frequency bands of asegment due to weak downlink signal level.

Updated At the target BTS when a handover to move a call to another band ofthe segment due to weak downlink signal level succeeds. PGSM 900and EGSM 900 are regarded here as different bands.

Dependencies with othercounters/PI(s)

Counter 004169 is updated in the source BTS.

Feature BSS10016 PGSM900/EGSM900/GSM1800 Common BCCH,BSS10087 GSM/EDGE 800/1900 Common BCCH

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Number

Name

Release

004166

INTER SEGMENT SUCCESS SDCCH HO BETWEENBANDS

S10.5

Description Number of completed and successful SDCCH-SDCCH handoversbetween two BTSs on different frequency bands between twosegments.

Updated At the target BTS when the call has been successfully transferred tothe target SDCCH.

Dependencies with othercounters/PI(s)

Counters 004058 and 004066 are updated along with this counter.

Feature BSS10016 PGSM900/EGSM900/GSM1800 Common BCCH,BSS10087 GSM/EDGE 800/1900 Common BCCH

Number

Name

Release

004167

INTER SEGMENT SUCCESS SDCCH HO BETWEEN BTSTYPES

S10.5

Description Number of completed and successful SDCCH-SDCCH handoversbetween two different types of BTSs between two segments.

Updated At the target BTS when the call has been successfully transferred tothe target SDCCH.

Dependencies with othercounters/PI(s)

Counters 004058 and 004066 are updated along with this counter.

Feature BSS10046 Multi BCF Control

Number

Name

Release

004168

INTER SEGMENT SUCCESS TCH HO BETWEEN BANDS

S10.5

Description Number of completed and successful TCH-TCH handovers betweentwo BTSs on different frequency bands between two segments.

Updated At the target BTS when the call has been successfully transferred tothe target TCH.

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Number

Name

Release

004168

INTER SEGMENT SUCCESS TCH HO BETWEEN BANDS

S10.5

Dependencies with othercounters/PI(s)

Counters 004056 and 004064 are updated along with this counter.

Feature BSS10016 PGSM900/EGSM900/GSM1800 Common BCCH,BSS10087 GSM/EDGE 800/1900 Common BCCH

Number

Name

Release

004169

INTER SEGMENT SUCCESS TCH HO BETWEEN BTSTYPES

S10.5

Description Number of completed and successful TCH-TCH handovers betweentwo different types of BTSs between two segments.

Updated At the target BTS when the call has been successfully transferred tothe target TCH.

Dependencies with othercounters/PI(s)

Counters 004056 and 004064 are updated along with this counter.

Feature BSS10046 Multi BCF Control

Number

Name

Release

004170

SPARE004170

Description Spare

Number

Name

Release

004171

SPARE004171

Description Spare

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Number

Name

Release

004172

SPARE004172

Description Spare

Number

Name

Release

004173

SPARE004173

Description Spare

Request counters are updated after the BSC has received theHANDOVER_REQUEST message from the MSC, but theHANDOVER_REQUEST_ACK message has not been sent to the MSC.

Number

Name

Release

004174

MSC I HO FROM INTER PLMN INTRA GSM ATT

S11

Description Number of the incoming inter-PLMN intra-GSM circuit switchedhandover attempts.

Updated When the inter-PLMN HO attempt is started.

Feature BSS11070 Support for Cell Global Identity

Number

Name

Release

004175

MSC I HO FROM INTER PLMN INTRA GSM SUCC

S11

Description Number of the successful incoming inter-PLMN intra-GSM circuitswitched handovers.

Updated When the inter-PLMN HO is successfully completed.

Feature BSS11070 Support for Cell Global Identity

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Name

Release

004176

MSC I HO FROM INTER PLMN INTRA GSM FAIL

S11

Description Number of the failed incoming inter-PLMN intra-GSM circuit switchedhandovers.

Updated When the inter-PLMN HO ends unsuccessfully.

Feature BSS11070 Support for Cell Global Identity

Number

Name

Release

004177

MSC O HO FROM INTER PLMN INTRA GSM ATT

S11

Description Number of the outgoing inter-PLMN intra-GSM circuit switchedhandover attempts.

Updated The HANDOVER_REQUIRED message is sent to the MSC.

When the HO attempt is started.

Feature BSS11070 Support for Cell Global Identity

Number

Name

Release

004178

MSC O HO FROM INTER PLMN INTRA GSM SUCC

S11

Description Number of the successful outgoing inter-PLMN intra-GSM circuitswitched handovers.

Updated When the HO is successfully completed.

Feature BSS11070 Support for Cell Global Identity

Number

Name

Release

004179

MSC O HO FROM INTER PLMN INTRA GSM FAIL

S11

Description Number of the failed outgoing inter-PLMN intra-GSM circuit switchedhandovers.

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Number

Name

Release

004179

MSC O HO FROM INTER PLMN INTRA GSM FAIL

S11

Updated When the HO ends unsuccessfully.

Feature BSS11070 Support for Cell Global Identity

Number

Name

Release

004180

HO ATTEMPT DUE TO ISHO

S11

Description Number of attempts to perform a TCH-TCH handover from the GSM tothe WCDMA RAN.

Updated At the source BTS when a handover is started to the WCDMA RAN.

Dependencies with othercounters/PI(s)

The success of the attempts can be seen on the BSC level in counter051152 (EXT OUT ISHO ) of the BSC Level Clear Code (PM)Measurement.

Feature BSS11107 GSM-WCDMA Interworking Enhancements

Number

Name

Release

004181

HO ATTEMPT DUE TO INTER SYSTEM DIRECT ACCESS

S11

Description Number of attempts to perform an SDCCH-TCH handover from theGSM to the WCDMA RAN due to Direct Access.

Updated At the source BTS when a handover is started due to Direct Access tothe WCDMA RAN.

Dependencies with othercounters/PI(s)

The success of the attempts can be seen on the BSC level in counter051154 (EXT OUT INTER SYSTEM DIRECT ACCESS ) of the BSCLevel Clear Code (PM) Measurement.

Feature BSS11107 GSM-WCDMA Interworking Enhancements

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Number

Name

Release

004182

MSC O SDCCH TCH HO TO WCDMA RAN ATTEMPT

S11

Description Number of attempts of outgoing SDCCH-TCH handovers from theGSM to the WCDMA RAN controlled by the MSC.

Updated At the source BTS when an SDCCH-TCH handover is started from theGSM to the WCDMA RAN.

Dependencies with othercounters/PI(s)

The success of the attempts can be seen in counter 004183 of theHandover Measurement.

Feature BSS11107 GSM-WCDMA Interworking Enhancements

Number

Name

Release

004183

MSC O SDCCH TCH TO WCDMA RAN SUCCESS HO

S11

Description Number of successful outgoing SDCCH-TCH handovers from theGSM to the WCDMA RAN controlled by the MSC.

Updated At the source BTS when an SDCCH-TCH handover from the GSM tothe WCDMA RAN is completed.

Dependencies with othercounters/PI(s)

The attempts can be seen in counter 004182 of the HandoverMeasurement.

Feature BSS11107 GSM-WCDMA Interworking Enhancements

Related topics

BSC Counters: Handover Measurement

Signalling charts of Handover Measurement

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3 Signalling charts of HandoverMeasurement

The following figures show the signalling charts of Handover Measurement:

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Figure 1. Successful internal intra-cell TCH to TCH handover

Counter 4109 or 4110 is updated only in case of a handover attempt due to a badRxlevel on a super-reuse frequency or a good Rxlevel on a regular frequency.

BTS: MSC:MS: BSC:

Cause downlink qualityCause distanceCause high int on uplinkCause high int on downlinkCause ho started by omcCause preemptionCause low distanceCause bad ci ratioCause good ci ratioHo att due bad rxlev on superHo att due good rxlev on reg

Int cell success ho

Cell tch tch

Cell tch tch attempt

Meas report Meas result

Physical context request

Physical context confirm

Channel activation

Channel activation ack

Assignment command

Assignment command

Sabm Establish indication

Ua

RrHO performed

Rf channel release

Rf channel release ack

Assignment complete

Assignment complete

Ho att due to GPRS

HO measurement, HO decision ±> intra-cell HO attempt, old channel

4025 or4027 or4029 or4030 or4033 or4086 or4088 or4089 or4090 or4109 or4110 or

4076

4130

New channel reservation and activation

Signalling on old channel

Signalling on new channel

Old channel release

4018

4073

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Figure 2. Successful internal inter-cell TCH to TCH handover

BTS_1:MS: MSC:BTS_2: BSC:

HO performed

Rf channel release

Meas report Meas result

HO commandHO command

Channel activation

HO detectionPhysical info

HO access

Establish indication

UaHO complete HO complete

Rr

Sabm

HO measurements, old channel in the old BTS

Cause uplink qualityCause uplink levelCause downlink qualityCause downlink levelCause distanceCause resp to msc invocatCause high int on uplinkCause high int on downlinkCause umbrella hoCause power bugdet hoCause ho started by omcCause preemptionCause field dropCause low distanceCause bad ci ratioCause good ci ratioHo due slow mov msHo due to ms slow speedHo due to ms high speed

4023 or4024 or4025 or4026 or4027 or4028 or4029 or4030 or4031 or4032 or4033 or4086 or4087 or4088 or4089 or4090 or4091 or4105 or4106 or

Bsc o nonopt at

Bsc i nonopt at

Bsc i tch tch at

Bsc o tch tch at

4071

4063

4059

4067

Ho att due erfd 4111

Rf channel release ack

Old channel release in the old BTS

Bsc i nonopt

Bsc i tch tch

Bsc i success ho

Bsc o nonopt

Bsc o tch tch

Bsc o success ho

4062

4056

4010

4070

4064

4014

Signalling on the new channel in the new BTS

New channel reservation and activation in the new BTS

Signalling on the old channel in the old BTS

Channel activation ack

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Counters 4067, 4071, 4014, 4064, 4070 and cause counters are updated in thesource cell. Counters 4059, 4063, 4010, 4056 and 4062 are updated in the targetcell. If the handover is made from normal to extended area, instead of counter4027, counter 4103 is updated. If the handover is made from extended to normalarea, instead of counter 4088, counter 4104 is updated. Counters 4063, 4071,4070 and 4062 are updated only if the target cell is non-optimum.

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Figure 3. Successful external TCH to TCH handover, source BSC

BTS: MSC:MS: BSC:

Msc o succ switch circ pool

Msc o succ tch tch ho

Msc o succ ho

Msc o gen ho com msg

Msc o gen ho req msg

Msc o tch tch at

Cause uplink qualityCause uplink levelCause downlink qualityCause downlink levelCause distanceCause resp to msc invocatCause high int on uplinkCause high int on downlinkCause umbrella hoCause power bugdet hoCause ho started by omcCause preemptionCause field dropCause low distanceHo due slow mov msHo att due switch circ poolHo due to ms slow speedHo due to ms high speedHo att due erfd

HO command

Rf channel release

Rf channel release ack

HO required

Meas report Meas result

Clear complete

HO commandHO command

Clear command

HO measurements, HO decision ±> external HO attempt

Channel reservation and activation in new (target) BSC, HO command from MSC

4052

4023 or4024 or4025 or4026 or4027 or4028 or4029 or4030 or4031 or4032 or4033 or4086 or4087 or4088 or4091 or4099 or4105 or4106 or4111

4009

4005

Old channel release in the old BSC

4095

4049

4004

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Signalling charts of Handover Measurement

Page 108: BSC Counters Handover

If the handover is made from normal to extended area, instead of counter 4027,counter 4103 is updated. If the handover is made from extended to normal area,instead of counter 4088, counter 4104 is updated. Counter 4095 is updated only ifcause counter 4099 is updated.

Figure 4. Successful external TCH to TCH handover, target BSC

Counter 4093 can be updated only if counter 4092 is updated.

BSC:

Msc i succ ho

Msc i succ switch circ pool

Msc i succ tch tch ho

Msc i att switch circ pool

Msc i tch tch ho att

MS: MSC:BTS:

HO request

Channel activation

Channel activation ack

HO request ack

HO access

HO detection HO detection

Physical info

Sabm

Establish indication

Ua

HO complete

Rr

HO complete

HO completed

4000

4093

4043

Signalling on the new BTS, connection

HO measurements and external HO decision done in source BSC, MSC sends HO request

Channel reservation and activation in the new BTS

4092

4046

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Figure 5. Successful internal intra-cell SDCCH to SDCCH handover

MS: BTS: BSC: MSC:

Meas report Meas result

Cell sdcch attempt

Cause downlink qualityCause distanceCause high int on uplinkCause high int on downlinkCause ho started by omcCause preemptionCause low distanceCause bad ci ratioCause good ci ratio

Physical context request

Physical context confirm

Channel activation

Channel activation ack

Assignment command

Assignment command

Sabm Establish indication

Ua

Assignment complete

Assignment complete

RrHO performed

Cell sdcch

Int cell success ho

Rf channel release

Rf channel release ack

HO measurement, HO decision ±> intra-cell HO attempt, old channel

New channel reservation and activation

Signalling on old channel

Signalling on new channel

Old channel release

4078

4025 or4027 or4029 or4030 or4033 or4086 or4088 or4089 or4090 or

4075

4018

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Figure 6. Successful internal inter-cell SDCCH to SDCCH handover

MS: BTS_1: BTS_2: BSC: MSC:

Meas report Meas result

Bsc o sdcch at

Bsc i sdcch at

Bsc i nonopt at

Bsc o nonopt at

Channel activation

Channel activation ack

HO command HO command

HO access HO detectionPhysical info

Sabm Establish indicationUa

HO complete HO completeRr HO performed

Bsc o success ho

Bsc o sdcch

Bsc o nonopt

Bsc i success ho

Bsc i sdcch

Bsc i nonopt

Rf channel release

Rf channel release ack

HO measurements, old channel in the old BTS

Old channel release in the old BTS

New channel reservation and activation in the new BTS

Signalling on the old channel in the old BTS

Signalling on the new channel in the new BTS

4069

4061

4063

4071

4014

4066

4070

4010

4058

4062

Cause uplink qualityCause uplink levelCause downlink qualityCause downlink qualityCause distanceCause resp to msc invocatCause high int on uplinkCause high int on downlinkCause umbrella hoCause power bugdet hoCause ho started by omcCause preemptionCause field dropCause low distanceCause bad ci ratioCause good ci ratioHo due slow mov msHo due to ms slow speedHo due to ms high speedHo att due erfd

4023 or4024 or4025 or4026 or4027 or4028 or4029 or4030 or4031 or4032 or4033 or4086 or4087 or4088 or4089 or4090 or4091 or4105 or4106 or4111

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Counters 4069, 4071, 4014, 4066, 4070 and cause counters are updated in thesource cell. Counters 4061, 4063, 4010, 4058 and 4062 are updated in the targetcell. If the handover is made from normal to extended area, instead of counter4027, counter 4103 is updated. If the handover is made from extended to normalarea, instead of counter 4088, counter 4104 is updated. Counters 4063, 4071,4070 and 4062 are updated only if the target cell is non-optimum.

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Figure 7. Successful external SDCCH to SDCCH handover, source BSC

BTS: MSC:MS: BSC:

Msc o sdcch

Msc o succ ho

Msc o gen ho com msg

Msc o gen ho req msg

Msc o sdcch at

HO command

Rf channel release

Rf channel release ack

HO required

Meas report Meas result

Clear complete

HO commandHO command

Clear command

HO measurements, HO decision ±> external HO attempt

Cause uplink qualityCause uplink levelCause downlink qualityCause downlink qualityCause distanceCause resp to msc invocatCause high int on uplinkCause high int on downlinkCause umbrella hoCause power bugdet hoCause ho started by omcCause preemptionCause field dropCause low distanceHo due slow mov msHo att due switch circ poolHo due to ms slow speedHo due to ms high speedHo att due erfd

4023 or4024 or4025 or4026 or4027 or4028 or4029 or4030 or4031 or4032 or4033 or4086 or4087 or4088 or4091 or4099 or4105 or4106 or4111

4054

Channel reservation and activation in new (target) BSC, HO command from MSC

4051

4004

4009

4005

Old channel release in the old BSC

Msc o succ switch circ pool 4095

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If the handover is made from normal to extended area, instead of counter 4027,counter 4103 is updated. If the handover is made from extended to normal area,instead of counter 4088, counter 4104 is updated. Counter 4095 is updated only ifcause counter 4099 is updated.

Figure 8. Successful external SDCCH to SDCCH handover, target BSC

Counter 4093 is updated only if counter 4092 is updated.

BSC:

Msc i succ ho

Msc i succ switch circ pool

Msc i sdcch

Msc i att switch circ pool

Msc i sdcch att

MS: MSC:BTS:

HO request

Channel activation

Channel activation ack

HO request ack

HO access

HO detection HO detection

Physical info

Sabm

Establish indication

Ua

HO complete

Rr

HO complete

HO completed

HO measurements and external HO decision done in source BSC, MSC sends HO request

Channel reservation and activation in the new BTS

Signalling on the new BTS, connection

4000

4093

4045

4092

4048

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Signalling charts of Handover Measurement

Page 114: BSC Counters Handover

Figure 9. Internal intra-cell directed retry including feature BSS6114: TCHassignment to the super-reuse TRX in IUO

BSC:

Int cell success ho

Cell sdcch tch

Cause dir retry

Cell sdcch tch at

MS: MSC:BTS:

Assignment requestPhysical context request

Sabm Establish indication

Channel activation

Channel activation ack

Physical context confirm

Assignment commandAssignment command

Ua

Rr Assignment complete

Rf channel release

Rf channel release ack

Assignment complete Assignment complete

Queueing indication

Alert Alert

Connect ackConnect ack

Connect Connect

Physical context request

Physical context confirm

Paging part

Radio access part (on CCCH)

DDCH establishment part

SDCCH signalling part

Cell is congested, no TCH, DR HO begins

Queueing possible and started

Signalling on FACCH - TCH

Signalling on SDCCH

TCH reservation and activation

Physical context information

SDCCH release

Connection

Conversation phase

4018

4074

4079

4077

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Figure 10. Internal inter-cell directed retry, including feature BSS6114 TCHassignment to the super-reuse TRX in IUO

BSC:

Bsc i nonopt

Bsc i sdcch tch

Bsc i success ho

Bsc o nonopt

Bsc o sdcch tch

Bsc o success ho

Bsc o nonopt at

Bsc i nonopt at

Bsc i sdcch tch at

Cause dir retry

Bsc o sdcch tch at

MS: MSC:BTS:

Assignment requestPhysical context request

Sabm Establish indication

Channel activation

Channel activation ack

Physical context confirm

HO commandHO command

HO access HO detection

Physical info

Ua

Rr Assignment complete

Rf channel release

Rf channel release ack

HO complete HO complete

Queueing indication

Alert Alert

Connect ackConnect ack

Connect Connect

Paging part

Radio access part (on CCCH)

DDCH establishment part

SDCCH signalling part

Connection

Cell is congested, no TCH, DR HO begins

Queueing possible and started

TCH reservation and activation in new BTS

Signalling on SDCCH in old BTS

Signalling on FACCH - TCH in new BTS

SDCCH release in old BTS

Conversation phase

4062

4057

4010

4070

4065

4014

4071

4063

4060

4079

4068

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Counters 4063, 4071, 4070 and 4062 are updated only if the target cell is non-optimum.

Figure 11. External directed retry, source BSC

BSC:

Msc o gen ho com msg

Msc o sdcch tch

Msc o succ ho

Msc o gen ho req msg

Cause dir retry

Msc o sdcch tch at

MS: MSC:BTS:

Assignment requestPhysical context request

HO command

Clear command

Clear complete

Physical context confirm

HO commandHO command

Rf channel release

Rf channel release ack

Queueing indication

Ho required

Paging part

Radio access part (on CCCH)

DDCH establishment part

Cell is congested, no TCH, DR HO begins

Queueing possible and started

SDCCH signalling part

TCH reservation and activation in target BSC

HO command from MSC, signalling on SDCCH

Signalling on FACCH - TCH on target BSC

SDCCH release in source BSC

4009

4050

4004

4005

4079

4053

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Figure 12. External directed retry, target BSC

BSC:

Msc i succ ho

Msc i sdcch tch

Msc i sdcch tch ho att

MS: MSC:BTS:

HO request

Channel activation

Channel activation ack

HO request ack

HO accessHO detection HO detection

Physical info

Sabm Establish indication

Ua

HO complete

Rr

HO complete

HO completed

Alert Alert

Connect Connect

Connect ackConnect ack

External DR start done in initial BSC, MSC sends ho request

Channel reservation and activation in the new BTS

Signalling on the new BTS, connection

4000

4044

4047

Conversation phase

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Signalling charts of Handover Measurement

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Figure 13. Unsuccessful internal intra-cell TCH to TCH handover due to a lackof resources

BTS: MSC:MS: BSC:

Int cell unsucc ho due lack 4019

Meas report

Meas result

Physical context request

Physical context confirm

HO measurement, HO decision ±> intra-cell HO attempt, old channel

Normal HO counters updated, see figure 1

Physical context information

New channel reservation and activation

HO ends and signalling continues on old channel

No free channel available

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Figure 14. Unsuccessful internal inter-cell TCH to TCH handover due to a lackof resources

Counters 4071 and 4072 are updated in the source cell. Counters 4063 and 4011are updated in the target cell. Counters 4063 and 4071 are updated only if thetarget cell is non-optimum.

BTS_1:MS: MSC:BTS_2: BSC:

Bsc o nonopt at

Bsc o fail lack

Bsc i unsucc ho due lack

Bsc i nonopt at

Meas report

Meas result

HO measurements, HO decision ±> Internal inter-cell HO, old channel in old BTS

Normal HO counters updated, see figure 2

New channel reservation and activation in the new BTS

No free channel available

HO ends and signalling continues in the old channel

4071

4072

4011

4063

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Signalling charts of Handover Measurement

Page 120: BSC Counters Handover

Figure 15. Unsuccessful external TCH to TCH handover due to a lack ofresources, source BSC

BTS: MSC:MS: BSC:

Msc o gen ho req msg

Msc o fail lack

HO required reject

HO required

Meas report

Meas result

HO measurements, HO decision ±> external HO attempt

Normal HO counters updated, see figure 3

Unsuccessful channel reservation in new (target) BSC due lack of resources

HO ends and signalling continuous in the old channel

4005

4055

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Figure 16. Unsuccessful external TCH to TCH handover due to a lack ofresources, target BSC

BSC:

Msc i unsucc ho due lack

Msc i tch tch ho att

MS: MSC:BTS:

HO request

HO failure

HO measurements and external HO decision done in source BSC, MSC sends HO request

Channel reservation and activation in the new BTS

No free channel

HO ends and signalling continuous on the old channel in the old BSC

4001

4046

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Signalling charts of Handover Measurement

Page 122: BSC Counters Handover

Figure 17. Unsuccessful internal intra-cell TCH to TCH handover because ahandover is not allowed at this phase of the call

BTS: MSC:MS: BSC:

Int cell ho not allowed

Meas report

Meas result

Physical context request

Physical context confirm

Channel activation

Channel activation ack

Rf channel release

Rf channel release ack

HO measurement, HO decision ±> intra-cell HO attempt, old channel

Normal HO counters updated, see figure 1

New channel reservation and activation

Signalling on old channel, HO not allowed at this phase of call

Signalling on new channel

Signalling continuous on old channel

4036

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Figure 18. Unsuccessful internal inter-cell TCH to TCH handover because ahandover is not allowed at this phase of the call

Counter 4038 is updated in the source cell. Counter 4081 is updated in the targetcell.

BTS_1:MS: MSC:BTS_2: BSC:

Bsc o ho not allowed

Bsc i end of ho

Rf channel release

Rf channel release ack

Meas report

Meas result

Channel activation

Channel activation ack

HO measurements, old channel in the old BTS

Normal HO counters updated, see figure 2

New channel reservation and activation in the new BTS

Signalling on the old channel in the old BTS, HO not allowed

Signalling on the new channel in the new BTS

Signalling continuous on the old channel

4038

4081

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Signalling charts of Handover Measurement

Page 124: BSC Counters Handover

Figure 19. Unsuccessful external TCH to TCH handover because a handover isnot allowed, source BSC

BTS: MSC:MS: BSC:

Msc o ho not allowed

Meas report

Meas result

HO measurements, HO decision ±> external HO attempt

Normal HO counters updated, see figure 3

HO not allowed

Signalling continuous on old channel

4037

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Figure 20. Unsuccessful internal intra-cell TCH to TCH handover due to afailure in the activation of a new channel

BTS: MSC:MS: BSC:

Int cell unsucc ho due bss probl 4021

Meas report

Meas result

Physical context request

Physical context confirm

Channel activation

Channel activation nack

Rf channel release

Rf channel release ack

HO measurement, HO decision ±> intra-cell HO attempt, old channel

Normal HO counters updated, see figure 1

New channel reservation and activation

Signalling continuous on old channel

Channel activation fails

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Signalling charts of Handover Measurement

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Figure 21. Unsuccessful internal inter-cell TCH to TCH handover due to afailure in the activation of a new channel

Counter 4016 is updated in the source cell. Counter 4013 is updated in the targetcell.

BTS_1:MS: MSC:BTS_2: BSC:

Bsc o end of ho

Bsc i unsucc ho due bss probl

Meas report

Meas result

HO measurements, old channel in the old BTS

Normal HO counters updated, see figure 2

New channel reservation and activation in the new BTS

Channel activation fails

Signalling continuous on the old channel

Rf channel release

Rf channel release ack

Channel activation

Channel activation nack

4016

4013

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Figure 22. Unsuccessful external TCH to TCH handover due to a failure in theactivation of a new channel, target BSC

BSC:

Msc i att switch circ pool

Msc i tch tch ho att

Msc i unsucc ho due bss probl

MS: MSC:BTS:

HO request

HO failure

Channel activation

Channel activation nack

Rf channel release

Rf channel release ack

HO measurements and external HO decision done in source BSC, MSC sends HO request

Channel reservation and activation in the new BTS

Channel activation fails

HO ends and signalling continuous on the old channel in the old BSC

4092

4046

4003

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Signalling charts of Handover Measurement

Page 128: BSC Counters Handover

Figure 23. Unsuccessful internal intra-cell TCH to TCH handover due to losingthe MS during handover. The GSM timer T3107 expires.

BTS: MSC:MS: BSC:

Cell drop calls

Int cell unsucc ho due move

Timer T3107 expires

Start timer T3107

Meas report

Meas result

Physical context request

Physical context confirm

Channel activation

Channel activation ack

Assignment command

Assignment command

Rf channel release

Rf channel release ack

Rf channel release

Rf channel release ack

HO measurement, HO decision ±> intra-cell HO attempt, old channel

Normal HO counters updated, see figure 1

Signalling on old channel

MS is lost, Timer T3107 Expires

4085

4020

New channel release

Old channel release

New channel reservation and activation

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Figure 24. Unsuccessful internal inter-cell TCH to TCH handover due to losingthe MS during handover. The GSM timer T3103 expires.

Counters 4016 and 4084 are updated in the source cell. Counters 4012 and 4083are updated in the target cell. Signalling can also be partly missing, depending onwhere the failure takes place.

BTS_1:MS: MSC:BTS_2: BSC:

Timer T3103 expires

Start timer T3103

Bsc i drop calls

Bsc i unsucc ho due conn

Bsc o drop calls

Bsc o end of ho

Rf channel release

Rf channel release ack

Meas report

Meas result

HO command

HO command

Channel activation

Channel activation ack

HO detection

Physical info

HO access

Rf channel release

Rf channel release ack

HO measurements, old channel in the old BTS

Normal HO counters updated, see figure 2

New channel reservation and activation in the new BTS

Signalling on the old channel in the old BTS

Signalling on the new channel in the new BTS

4083

4012

4084

4016

New channel release

Old channel release in the old BTS

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Figure 25. Unsuccessful internal intra-cell TCH to TCH handover due to MSreturning to the old channel

Signalling can be also partly missing, depending on where the failure happens.

BTS: MSC:MS: BSC:

Int cell unsucc ho due return 4022

Meas report

Meas result

Physical context request

Physical context confirm

Channel activation

Channel activation ack

Assignment command

Assignment command

Sabm

Establish indication

Ua

Rr

Rf channel release

Rf channel release ack

Assignment failure

Assignment failure

HO measurement, HO decision ±> intra-cell HO attempt, old channel

Normal HO counters updated, see figure 1

New channel reservation and activation

Signalling on old channel

Signalling on new channel

Signalling continuous on old channel

New channel release

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Figure 26. Unsuccessful internal inter-cell TCH to TCH handover due to MSreturning to the old channel

Counter 4015 is updated in the source cell. Counter 4012 is updated in the targetcell. Signalling can be also partly missing, depending on where the failure takesplace.

BTS_1:MS: MSC:BTS_2: BSC:

Bsc o unsucc ho due return

Bsc i unsucc ho due conn

HO failure

Rf channel release

Rf channel release ack

Meas report

Meas result

HO command

HO command

Channel activation

Channel activation ack

HO detection

Physical info

HO access

Establish indication

Ua

HO failure

HO failure

Rr

Sabm

New channel release

Signalling on the new channel in the new BTS

Signalling on the old channel in the old BTS

HO measurements, old channel in the old BTS

Normal HO counters updated, see figure 2

New channel reservation and activation in the new BTS

4015

4012

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Signalling charts of Handover Measurement

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Figure 27. Unsuccessful external TCH to TCH handover due to MS returning tothe old channel, source BSC

BTS: MSC:MS: BSC:

Msc o unsucc ho due return

Msc o gen ho com msg

Msc o gen ho req msg

HO command

Sabm

Establish indication

HO required

Meas report

Meas result

HO failure

HO command

HO command

HO failure HO failure

Ua

HO measurements, HO decision ±> external HO attempt

Normal HO counters updated, see figure 3

Channel reservation and activation in new (target) BSC, HO command from MSC

MS returns to old channel

4006

4009

4005

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Figure 28. Unsuccessful external TCH to TCH handover due to MS returning tothe old channel, target BSC

BSC:

Msc i end of ho

Msc i att switch circ pool

Msc i tch tch ho att

MS: MSC:BTS:

HO request

Channel activation

Channel activation ack

HO request ack

Clear command

Rf channel release

Rf channel release ack

Clear complete

HO measurements and external HO decision done in source BSC, MSC sends HO request

Channel reservation and activation in the new BTS

4080

4092

4046

HO failure received from BSS1

New channel release

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Signalling charts of Handover Measurement

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Figure 29. Unsuccessful internal intra-cell TCH to TCH handover due to callclearing during handover

Signalling can also be partly missing, depending on when the call is cleared.

BTS: MSC:MS: BSC:

Int cell call cleared during ho 4039

Meas report

Meas result

Physical context request

Physical context confirm

Channel activation

Channel activation ack

Assignment commandAssignment command

Sabm

Establish indicationUa

Disconnect

Release complete

Rf channel release

Rf channel release ack

Disconnect

Release complete

ReleaseRelease

Clear command

Channel release

Deactive SACCHDisc

UaRelease indication

Rf channel release

Rf channel release ack

Target channel release

Source channel release

Call cleared during handover by MS

Signalling on new channel

Signalling on old channel

HO measurement, HO decision ±> intra-cell HO attempt, old channel

Normal HO counters updated, see figure 1

New channel reservation and activation

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Figure 30. Unsuccessful internal inter-cell TCH to TCH handover due to callclearing during handover

BTS_1:MS: MSC:BTS_2: BSC:

Bsc i end of ho

Bsc o call cleared during ho

Release complete

Rf channel release

Rf channel release ack

Meas report

Meas result

HO command

HO command

Channel activation

Channel activation ack

HO detectionPhysical info

HO access

Establish indicationUa

Disconnect

Disconnect

Release

Sabm

Release

Release complete

Clear command

Clear complete

Channel release

Deactive SACCHDisc

UaRelease indication

Rf channel release

Rf channel release ack

HO measurements, old channel in the old BTS

Normal HO counters updated, see figure 2

Signalling on the old channel in the old BTS

New channel reservation and activation in the new BTS

Signalling on the new channel in the new BTS

Call cleared during HO by MS

4081

4042

Source channel release

Target channel release

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Counter 4042 is updated in the source cell. Counter 4081 is updated in the targetcell. Signalling can also be partly missing, depending on when the call is cleared.

Figure 31. Unsuccessful external TCH to TCH handover due to call clearingduring handover, source BSC

Signalling can also be partly missing, depending on when the call is cleared.

BTS: MSC:MS: BSC:

Msc o call clear during ho

Msc o gen ho com msg

Msc o gen ho req msg

HO command

Rf channel release

Rf channel release ack

HO required

Meas report

Meas result

Clear complete

HO command

HO command

Clear command

Disconnect Disconnect

ReleaseRelease

Release complete

Release complete

Channel release

Deactive SACCHDisc

UaRelease indication

4041

4009

4005

Call cleared during HO by MS

Channel reservation and activation in new (target) BSC, HO command from MSC

Normal HO counters updated, see figure 3

HO measurements, HO decision ±> external HO attempt

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Figure 32. Unsuccessful internal intra-cell TCH to TCH handover because noradio resources are available due to switch_crc_pool

BTS: MSC:MS: BSC:

Int unsucc a int circ type 4098

Physical context confirm

Meas report

Meas result

Physical context request

HO measurement, HO decision ±> intra-cell HO attempt, old channel

Normal HO counters updated, see figure 1

New channel reservation and activation

Unsuccesful reservation with cause switch_crc_pool

Signalling continuous on old channel

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Figure 33. Unsuccessful internal inter-cell TCH to TCH handover because noradio resources are available due to switch_crc_pool

Counter 4071 is updated in the source cell. Counter 4063 is updated in the targetcell. Counters 4063 and 4071 are updated only if the target cell is non-optimum.

BTS_1:MS: MSC:BTS_2: BSC:

Bsc i unsucc a int circ type

Bsc o unsucc a int circ type

Bsc o nonopt at

Bsc i nonopt at

Meas report

Meas result

HO measurements, old channel in the old BTS

Normal HO counters updated, see figure 2

New channel reservation and activation in the new BTS

Unsuccessful reservation with cause switch_crc_pool

Signalling continuous on old channel

4097

4096

4071

4063

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Figure 34. Unsuccessful external TCH to TCH handover because no radioresources are available due to switch_crc_pool , target BSC

BSC:

Msc i unsucc due a if crc

Msc i att switch circ pool

Msc i tch tch ho att

MS: MSC:BTS:

HO request

HO failure

HO measurements and external HO decision done in source BSC, MSC sends HO request

Channel reservation and activation in the new BTS

Unsuccessful reservation with cause switch_crc_pool

Signalling continuous on old channel

4101

4092

4046

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Figure 35. Successful handover type reselection from an internal intra-cell TCHto TCH handover to an external handover due to switching the circuitpool

BTS: MSC:MS: BSC:

Msc o succ switch circ pool

Msc o succ tch tch ho

Msc o succ ho

Msc o gen ho com msg

Msc o gen ho required msg

Ho att due switch circ pool

Msc o tch tch at

Msc o att switch circ pool

Int unsucc a int circ type

Meas report

Meas result

Physical context request

Physical context confirm

Rf channel release

Rf channel release ack

HO required

HO command

HO commandHO command

Clear command

Clear complete

4095

4049

4004

4009

4005

Old channel release

TCH reservation and activation in target BSC

External HO begins

HO command from target BSC to the source BSC

4099

4052

4094

4098

New channel reservation and activation

HO type reselection due switching circuit pool from intra to external HO

Unsuccessful reservation with cause switch_crc_pool

Normal HO counters updated, see figure 1

HO measurement, HO decision ±> intra-cell HO attempt, old channel

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Figure 36. Successful handover type reselection from an internal inter-cell TCHto TCH handover to an external handover due to switching the circuitpool

Counter 4096 is updated in the source cell. Counter 4097 is updated in the targetcell.

BTS: MSC:MS: BSC:

Bsc o unsucc a int circ type

Msc o succ switch circ pool

Msc o succ tch tch ho

Msc o succ ho

Msc o gen ho com msg

Msc o gen ho required msg

ho att due switch circ pool

Msc o tch tch at

Msc o att switch circ pool

Bsc i unsucc a int circ type

Meas report

Meas result

Rf channel release

Rf channel release ack

HO required

HO command

HO command

HO command

Clear command

Clear complete

HO measurement, HO decision ±> inter-cell HO attempt, old channel

New channel reservation and activation in new BTS

HO type reselection due switching circuit pool from inter to external HO

Unsuccessful reservation with cause switch_crc_pool

Normal HO counters updated, see figure 2

4096

4099

4052

4094

4097

TCH reservation and activation in target BSC

External HO begins

HO command from target BSC to the source BSC

4095

4049

4004

4009

4005

Old channel release

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Figure 37. Unsuccessful external TCH to TCH handover because the MSCrejects the handover due to various causes, source BSC

BTS: MSC:MS: BSC:

Msc o unsucc due a if crcMsc o fail lackMsc o adj cell id errMsc o end of hoMsc o ho not allowed

Msc o gen ho req msg

HO reject

HO required

Meas report

Meas result

HO measurements, HO decision ±> external HO attempt

Normal HO counters updated, see figure 3

Channel reservation and activation in new (target) BSC

MSC rejects handover with different causes

Call continuous on old channel

4102 or4055 or4100 or4007 or4037

4005

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Figure 38. Unsuccessful external TCH to TCH handover due to GSM timer T8expiry, source BSC

Counter 4107 is also updated if the MSC sends a CLEAR_COMMAND messagewith a cause other than call control or handover successful .

BTS: MSC:MS: BSC:

Msc o call drop dur ho

Timer T8 Expires

Start timer T8

Msc o end of ho

Msc o gen ho com msg

Msc o gen ho req msg

HO command

Rf channel release

Rf channel release ack

HO required

Meas report

Meas result

Clear complete

HO command

HO command

Clear command

Clear request

HO measurements, HO decision ±> external HO attempt

Normal HO counters updated, see figure 3

Channel reservation and activation in new (target) BSC, HO command from MSC

4009

4005

Timer T8 expires on source BSC while waiting for Clear command

4107

4007

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Figure 39. Unsuccessful external TCH to TCH handover due to adjacent cellerror, source BSC

The MSC sends a HO_REJECT message with cause invalid_cell or the sourceside BSC notices that the target side identification information is invalid in theHO_COMMAND message.

BTS: MSC:MS: BSC:

Msc o adj cell id err

Msc o gen ho req msg

HO reject

HO required

Meas report

Meas result

HO failure

HO measurements, HO decision ±> external HO attempt

Normal HO counters updated, see figure 3

Channel reservation and activation in new (target) BSC, HO reject from MSC

Target cell information (BCCH frequency or / and BSIC) differs from that in source

BSC radio network configuration database, Alarm 2725 is set

Call continuous on old channel

4100

4005

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Figure 40. Unsuccessful internal intra-cell TCH to TCH handover, caused by aninternal timer expiry in the BSC or a CONNECTION_FAILURE,ERROR_INDICATION, or ERROR_REPORT message coming tothe target channel

The MS returns to the old channel.

BTS: MSC:MS: BSC:

Int cell unsucc ho due return 4022

Error report

Meas report

Meas result

Physical context request

Physical context confirm

Channel activation

Channel activation ack

Assignment command

Assignment command

Connection failure

Error indication

Assignment failure

Rf channel release

Rf channel release ack

Assignment failure

Call continuous on old channel

Signalling on old channel

Signalling on new channel

Signalling on old channel

New channel reservation and activation

Normal HO counters updated, see figure 1

HO measurement, HO decision ±> intra-cell HO attempt, old channel

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Figure 41. Unsuccessful internal inter-cell TCH to TCH handover due to a radiolink failure during handover

A RELEASE_INDICATION, CONNECTION_FAILURE orERROR_INDICATION message comes to the source channel. The signalling canbe partly missing depending on where the failure takes place. Counter 4017 isupdated in the source cell. Counter 4081 is updated in the target cell.

BTS_1:MS: MSC:BTS_2: BSC:

Bsc i end of ho

Bsc o end of ho due bss

Rf channel release

Rf channel release

Rf channel release ack

Meas report

Meas result

Release indication

Connection failure

Channel activation

Channel activation ack

Error indication

Rf channel release ack

4081

4017

HO measurements, old channel in the old BTS

New channel reservation and activation in the new BTS

Normal HO counters updated, see figure 2

Signalling on the old channel in the old BTS

New TCH channel release in the new BTS

Old channel release in the old BTS

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Figure 42. Unsuccessful internal inter-cell TCH to TCH handover caused byinternal timer expiry or a failure in the connection of a bi-directionalspeech path

BTS_1:MS: MSC:BTS_2: BSC:

Failure

Bsc i drop calls

Bsc i unsucc ho due bss probl

Bsc o drop calls

Bsc o end of ho due bss

Rf channel release

Rf channel release ack

Meas reportMeas result

HO commandHO command

Channel activation

Channel activation ack

HO detectionPhysical info

HO access

Establish indicationUa

HO complete HO complete

Rr

Sabm

Rf channel release

Rf channel release ack

Clear request

Clear command

Channel release

Deactive SACCHDisc

Release indicationUa

Clear complete

Target channel release in new BTS

Old channel release in the old BTS

4083

4013

4084

4017

Connection of bidirection speech path fails or internal timer expires

Signalling on the new channel in the new BTS

Signalling on the old channel in the old BTS

New channel reservation and activation in the new BTS

Normal HO counters updated, see figure 2

HO measurements, old channel in the old BTS

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Counters 4017 and 4084 are updated in the source cell. Counters 4013 and 4083are updated in the target cell.

Figure 43. Unsuccessful external TCH to TCH handover due to a radio linkfailure during handover, source BSC

A CONNECTION_FAILURE, ERROR_INDICATION or ERROR_REPORTmessage comes to the source channel, or an internal timer expires.

BTS: MSC:MS: BSC:

Msc o end of ho due bss

Connection failure

Rf channel release

Rf channel release ack

HO required

Meas report

Meas result

HO failure

Error indication

Error report

4008

Old channel release in the old BSC

Failures on source

Channel reservation and activation in new (target) BSC

Normal HO counters updated, see figure 3

HO measurements, HO decision ±> external HO attempt

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Figure 44. Unsuccessful external TCH to TCH handover due to a radio linkfailure during handover, target BSC

A CONNECTION_FAILURE, ERROR_INDICATION or ERROR_REPORTmessage comes to the target channel, or an internal timer expires. Signalling canbe partly missing depending on where the failure takes place.

BSC:

Msc i unsucc ho due conn

Msc i att switch circ pool

Msc i tch tch ho att

MS: MSC:BTS:

HO request

Channel activation

Channel activation ack

HO request ack

HO access

HO detection HO detection

Physical info

Sabm

Establish indication

Ua

Error indication

Error report

Connection failure

HO failure

Rf channel release

Rf channel release ack

4002

4092

4046

Signalling on the new BTS, connection

Channel reservation and activation in the new BTS

HO measurements and external HO decision done in source BSC, MSC sends HO request

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Figure 45. Unsuccessful external TCH or TCH handover, source BSC

The GSM timer T7 expires in the source BSC.

BTS: MSC:MS: BSC:

Msc o fail lack

Timer T7 expires

Start timer T7

Msc o gen ho required msg

HO required

Meas report

Meas result

Call continuous on old channel

4055

4005

Timer T7 expires on source BSC

Channel reservation and activation in new (target) BSC

Normal HO counters updated, see figure 3

HO measurements, HO decision ±> external HO attempt

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Figure 46. Unsuccessful external TCH to TCH handover, target BSC

The handover fails because the MSC sends a CLEAR_COMMAND messagewith a cause other than call control or radio interface failure revision to oldchannel . Counter 4108 is also updated if the GSM timer T9113 expires.

BSC:

Msc i call poss drop dur ho

Msc i end of ho

Msc i att switch circ pool

Msc i tch tch ho att

MS: MSC:BTS:

HO request

Channel activation

Channel activation ack

HO request ack

Clear command

Rf channel release

Rf channel release ack

Clear complete

New channel release

HO failure received from BSS1

Channel reservation and activation in the new BTS

HO measurements and external HO decision done in source BSC, MSC sends HO request

4108

4080

4092

4046

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Figure 47. Successful internal intra-cell TCH TCH HSCSD handover from twoto one channel

BTS: MSC:MS: BSC:

Physical context request

Physical context confirm

Channel activation

Assignment command

Assignment command

SabmEstablish indication

Ua

Rr HO performed

Rf channel release

Rf channel release ack

Assignment completeAssignment complete

Meas report Meas result

Channel activation ack

Rf channel release

Rf channel release ack

Normal intra-cell HO counters are updated, see figure 1

Old channels are released

Signalling on new channel

Signalling on old channel

New channel reservation and activation

Only one suitable channel free

Normal intra-cell HO cause counter is updated, see figure 1

HO measurement, HO decision ±> intra-cell HO attempt, old channel

Two channel allocated for HSCSD call on source

Intra succ dec for HSCSD 4127

Intra succ for HSCSD 4125

Cell TCH TCH 4073

Intra att for HSCSD 4124

Cell TCH TCH attempt 4076

Int cell success ho 4018

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Figure 48. Successful internal intra-cell TCH TCH HSCSD handover from oneto three channels

BTS: MSC:MS: BSC:

Physical context request

Physical context confirm

Channel activation

Assignment commandAssignment command

Sabm Establish indication

Ua

Rr HO performed

Rf channel release

Rf channel release ack

Assignment completeAssignment complete

Meas report Meas result

Channel activation ack

Channel activation

Channel activation

Channel activation ack

Channel activation ack

One channel allocated for HSCSD call on source

HO measurement, HO decision ±> intra-cell HO attempt, old channel

Normal intra-cell HO cause counter is updated, see figure 1

Only one suitable channel free

New channel reservation and activation

Signalling on old channel

Signalling on new channel

Normal intra-cell HO counters are updated, see figure 1

Old channels are released

Intra att for HSCSD 4124

Intra succ inc for HSCSD 4126

Cell TCH TCH 4073

Int cell success ho 4018

Cell TCH TCH attempt 4076

Intra succ inc for HSCSD 4126

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Figure 49. Successful internal inter-cell TCH TCH HSCSD handover from threeto one channel

BTS_1:MS: MSC:BTS_2: BSC:

HO performed

Rf channel release

Rf channel release ack

Meas report Meas result

HO commandHO command

HO detection

Physical info

HO access

Establish indication

Ua

HO complete HO complete

Rr

Sabm

Rf channel release ack

Rf channel release

Rf channel release

Rf channel release ack

Three channel allocated for HSCSD call on source

HO measurements, old channel in the old BTS

Normal inter-cell HO cause counter is updated, see figure 2

New channel reservation and activation in the new BTS

Only two suitable channel free

Channel activation

Channel activation ack

Channel activation

Channel activation ack

Signalling on the old channel in the old BTS

Signalling on the new channel in the new BTS

Old channel release in the old BTS

Bsc i succ dec for HSCSD 4123

Bsc i succ for HSCSD 4121

Bsc o succ for HSCSD 4119

Bsc i TCH TCH 4056

Bsc i nonopt 4062

Bsc i success ho 4010

Bsc o TCH TCH 4064

Bsc o nonopt 4070

Bsc o success ho 4014

Bsc i nonopt att 4063

Bsc o nonopt att 4071

Bsc o att for HSCSD 4118

Bsc i att for HSCSD 4120

Bsc o TCH TCH att 4067

Bsc i TCH TCH att 4059

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Figure 50. Successful internal inter-cell TCH TCH HSCSD handover from twoto three channels

BTS_1:MS: MSC:BTS_2: BSC:

HO performed

Rf channel release

Meas report Meas result

HO commandHO command

Channel activation

Channel activation ack

HO detection

Physical info

HO access

Establish indication

Ua

HO complete HO complete

Rr

Sabm

Rf channel release ack

Channel activation

Channel activation

Channel activation ack

Channel activation ack

Rf channel release

Rf channel release ack

Old channel release in the old BTS

HO measurements, old channel in the old BTS

New channel reservation and activation in the new BTS

Normal inter-cell HO cause counter is updated, see figure 2

Two channel allocated for HSCSD call on source

Signalling on the new channel in the new BTS

Signalling on the old channel in the old BTS

Bsc i succ inc for HSCSD 4122

Bsc i succ for HSCSD 4121

Bsc o succ for HSCSD 4119

Bsc i TCH TCH 4056

Bsc o TCH TCH 4064

Bsc i nonopt 4062

Bsc i success ho 4010

Bsc o nonopt 4070

Bsc o success ho 4014

Bsc i nonopt att 4063

Bsc o nonopt att 4071

Bsc o att for HSCSD 4118

Bsc i att for HSCSD 4120

Bsc o TCH TCH att 4067

Bsc i TCH TCH att 4059

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Figure 51. Successful external TCH TCH HSCSD handover from two to twochannels, source BSC

BTS: MSC:MS: BSC:

HO command

Rf channel release

Rf channel release ack

HO required

Meas report Meas result

Clear complete

HO commandHO command

Clear command

Rf channel release

Rf channel release ack

HO measurements, HO decision ±> external HO attempt

Normal external HO cause counter is updated, see figure 3

Channel reservation and activation in new (target) BSC, HO command from MSC

Old channels are released in the old BSC

Msc o succ TCH TCH ho 4049

Msc o success ho 4004

Msc o gen ho com msg 4009

Msc o gen ho req msg 4005

Msc o TCH TCH att 4052

Msc o succ for HSCSD 4113

Msc o att for HSCSD 4112

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Figure 52. Successful external TCH TCH HSCSD handover from four to onechannel, target BSC

Counter 4117 is updated only if the target BSC has received information on theamount of channels allocated in the source BSC.

BSC:MS: MSC:BTS:

HO request

Channel activation

Channel activation ack

HO request ack

HO access HO detection HO detection

Physical info

Sabm Establish indication

Ua

HO complete

Rr

HO complete

HO completed

Only one suitable channel free

Channel reservations and activations in the new BTS

HO measurem. and external HO decision done in source BSC, MSC sends HO request

Four channel allocated for HSCSD on source BSC

Signalling on the new BTS, connection

Msc i succ dec for HSCSD 4117

Msc i succ for HSCSD 4115

Msc i succ TCH TCH ho 4043

Msc i TCH TCH ho att 4046

Msc i success ho 4000

Msc i att for HSCSD 4114

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Figure 53. Successful external TCH TCH HSCSD handover from one to twochannels, target BSC

Counter 4116 is updated only if the target BSC has received information on theamount of channels allocated in the source BSC.

BSC:MS: MSC:BTS:

HO request

Channel activation

Channel activation ack

HO request ack

HO access HO detection HO detection

Physical info

Sabm Establish indication

Ua

HO complete

Rr

HO complete

HO completed

Channel activation

Channel activation ack

Signalling on the new BTS, connection

Only one suitable channel free

HO measurem. and external HO decision done in source BSC, MSC sends HO request

One channel allocated for HSCSD on source BSC

Channel reservations and activations in the new BTS

Msc i succ TCH TCH ho 4043

Msc i succ for HSCSD 4115

Msc i succ inc for HSCSD 4116

Msc i TCH TCH ho att 4046

Msc i success ho 4000

Msc i att for HSCSD 4114

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Figure 54. Internal intra-cell direct access from regular DCCH to a super-reuseTRX

The optional feature BSS7057 Direct Access to Super-reuse TRX in IUO must beactivated.

BSC:

Int cell success hot

Cell sdcch tch att

Cell sdcch tch

Ho due direct access att

MS: MSC:BTS:

Assignment request

Physical context request

Sabm Establish indication

Channel activation

Channel activation ack

Physical context confirm

Assignment commandAssignment command

Ua

Rr

Assignment complete

Rf channel release

Rf channel release ack

Assignment complete Assignment complete

Alert Alert

Connect ackConnect ack

Connect Connect

Basic call signalling

4077

4128

Physical context information

TCH reservation and activation

Signalling on SDCCH

Signalling on FACCH - TCH

4018

4074

SDCCH release

Connection

Conversation phase

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Figure 55. Internal inter-cell direct access from parent DCCH to the child orparent TRX

The optional feature BSS7057 Direct Access to Super-reuse TRX in IUO must beactivated. Counters 4128, 4068, 4014 and 4065 are updated in the source cell.Counters 4060, 4010 and 4057 are updated in the target cell.

BSC:

Bsc o sdcch tch

Bsc i sdcch tch

Bsc i success ho

Bsc i sdcch tch at

Bsc o sdcch tch at

Bsc o success ho

Ho due direct access att

MS: MSC:BTS:

Assignment request

HO access

Sabm Establish indication

Channel activation

Channel activation ack

HO detection

HO commandHO command

Ua

Rr Assignment complete

Rf channel release

Rf channel release ack

HO complete HO complete

Alert Alert

Connect ackConnect ack

Connect Connect

Physical info

Basic call signalling

4060

4068

4128

New channel reservation and activation in the new BTS

Signalling on SDCCH on old BTS

Signalling on the new channel in the new BTS

4065

4057

4010

4014

SDCCH release

Connection

Conversation phase

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Figure 56. Internal inter-cell direct access from the TCH on a child TRX to theTCH on a parent TRX

Optional feature BSS7057 Direct Access to Super-reuse TRX in IUO must beactivated. Counters 4031, 4067, 4014 and 4064 are updated in the source cell.Counters 4059, 4010 and 4056 are updated in the target cell.

BSC:

Cause umbrella ho

Bsc o tch tch

Bsc i tch tch

Bsc i success ho

Bsc i tch tch at

Bsc o tch tch at

Bsc o success ho

MS: MSC:BTS:

Meas report

HO access

Sabm Establish indication

Channel activation

Channel activation ack

HO detection

HO commandHO command

Ua

Rr HO performed

Rf channel release

Rf channel release ack

HO complete HO complete

Physical info

Meas result

HO measurements, old channel in the old BTS

4031

4064

4056

4010

4059

4067

4014

New channel reservation and activation in the new BTS

Signalling on the old channel in the old BTS

Signalling on the new channel in the new BTS

Old channel release in the old BTS

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Signalling charts of Handover Measurement

Page 162: BSC Counters Handover

Figure 57. Handover attempt due to a BSC controlled TRHO

Channel activation

Channel activation ack

Rf resource indication

HO signalling continues

HO measurements

BSC:MS: MSC:BTS:

Cause HO started by traffic reason 4035

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BSC Counters: Handover Measurement

Page 163: BSC Counters Handover

Figure 58. Handover attempt due to DADL/B

Related topics

BSC Counters: Handover Measurement

Counters of Handover Measurement

Channel activation

Channel activation ack

Assignment request

Physical context request

Physical context confirm

BSC:MS: MSC:BTS:

HO attempt due to dadl/b 4129

Signalling

Signalling continues

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Signalling charts of Handover Measurement