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BSC Counters: HandoverMeasurement
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2003319Nokia BSC/TCSM S11 Product Documentation
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
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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List of figures
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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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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Summary of changes
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BSC Counters: Handover Measurement
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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Number
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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Counters of Handover Measurement
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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Number
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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Number
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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Counters of Handover Measurement
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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Number
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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Number
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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Counters of Handover Measurement
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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Counters of Handover Measurement
Number
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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Signalling charts of Handover Measurement
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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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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Signalling charts of Handover Measurement
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
110 (163) # Nokia CorporationNokia Proprietary and Confidential
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BSC Counters: Handover Measurement
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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Signalling charts of Handover Measurement
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
112 (163) # Nokia CorporationNokia Proprietary and Confidential
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BSC Counters: Handover Measurement
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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113 (163)
Signalling charts of Handover Measurement
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
114 (163) # Nokia CorporationNokia Proprietary and Confidential
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BSC Counters: Handover Measurement
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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Signalling charts of Handover Measurement
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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BSC Counters: Handover Measurement
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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117 (163)
Signalling charts of Handover Measurement
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
118 (163) # Nokia CorporationNokia Proprietary and Confidential
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BSC Counters: Handover Measurement
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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119 (163)
Signalling charts of Handover Measurement
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
120 (163) # Nokia CorporationNokia Proprietary and Confidential
dn9813636Issue 8-0 en
BSC Counters: Handover Measurement
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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121 (163)
Signalling charts of Handover Measurement
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
122 (163) # Nokia CorporationNokia Proprietary and Confidential
dn9813636Issue 8-0 en
BSC Counters: Handover Measurement
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
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
124 (163) # Nokia CorporationNokia Proprietary and Confidential
dn9813636Issue 8-0 en
BSC Counters: Handover Measurement
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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125 (163)
Signalling charts of Handover Measurement
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
126 (163) # Nokia CorporationNokia Proprietary and Confidential
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BSC Counters: Handover Measurement
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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127 (163)
Signalling charts of Handover Measurement
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
128 (163) # Nokia CorporationNokia Proprietary and Confidential
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BSC Counters: Handover Measurement
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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Signalling charts of Handover Measurement
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
130 (163) # Nokia CorporationNokia Proprietary and Confidential
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BSC Counters: Handover Measurement
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
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
132 (163) # Nokia CorporationNokia Proprietary and Confidential
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BSC Counters: Handover Measurement
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
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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BSC Counters: Handover Measurement
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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Signalling charts of Handover Measurement
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
136 (163) # Nokia CorporationNokia Proprietary and Confidential
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BSC Counters: Handover Measurement
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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Signalling charts of Handover Measurement
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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BSC Counters: Handover Measurement
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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Signalling charts of Handover Measurement
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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Signalling charts of Handover Measurement
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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BSC Counters: Handover Measurement
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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BSC Counters: Handover Measurement
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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Signalling charts of Handover Measurement
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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BSC Counters: Handover Measurement
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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Signalling charts of Handover Measurement
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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BSC Counters: Handover Measurement
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
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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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