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MTN NIGERIA 3G BENCHMARKING REPORT
LOCATION : LEKKI PHASE 1
DATE : JULY 2011
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TABLE OF CONTENTS
1 SECTION 1: Introduction……………………………………………………….....3
1.1Best Performing Network per KPI………………………………………………...4
1.2 Drive Test Route…………………………………………………………………...5
2 SECTION 2: Voice Call………………………………………………....................6
2.1 Voice Accessibility…………………………………………………………………6
2.2 Call Drop Rate……………………………………………………………………...7
2.3 Block Error Rate……………………………………………………………………8
2.4 Soft Handover Success Rate……………………………………………………..9
3 SECTION 3: Coverage/Video……………………………………........................11
3.1 Call Setup Success Rate………………………………………………………...11
3.2 Call Drop Rate…………………………………………………………………….12
3.3 Soft Handover Success Rate……………………………………………………13
3.4 Network Coverage..........................................................................................15
4 SECTION 4: SMS…………………………………………………………………...22
4.1 SMS Success Rate………………………………………………………………..22
4.2 Some Findings and recommendation…………………………………………..22
5. SECTION 5: Appendices…………………………………………………………24
5.1 Key Performance Indicator General Descriptions……………………………..24
5.2 List of Abbreviations………………………………………………………………29
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1 SECTIONINTRODUCTION
The main purpose of conducting a competitive network benchmarking in Lekki phase1 was to determine the quality of UMTS voice provided by MTN Nigeria whencompare with other network service providers in the area.Benchmarking is a technique, in which a company accurately measures itsperformance against that of best in a class of companies, determines how thosecompanies achieved their performance levels and uses the information to improve itsown performance and excel the competitors. Subjects that can be benchmarkedinclude strategies, operations and processes. In telecom sector, the basic theme todo benchmarking is to compare your network with its competitors by using differentparameters in the big cities of the country. From benchmarking, companies can alsocheck the health of its network.
This report contains five (5) major sections in which many of them are divided intosubsections. Section 1 is an introduction of the report which presents an overview ofthe tests performed, observations taken and the results generated. It has anexecutive summary which is a comprehensive information regarding the networkhealth and the services and KPIs monitored over a decided drive route. Section 2has the details regarding the network Coverage/Voice Calls. Section 3 has thedetails regarding Video Calls. Section 4 shows SMS analysis. Section 5 contains alist of Appendices.
Equipments Used
TEMS Investigation, Version 12.0.1 (with Dongle)
HP Laptop,
GPS Receiver:
2 Sets of Mobiles
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1.1 Best Performing Network per KPI
Executive Summary
ItemNo.
Voice Call KPIs MTN Airtel
1 Call Setup Success Rate (CSSR) 100% 66.67%
2 Call Drop Rate (CDR) 0% 50%
3 Call Success Rate (CSR) 100% 50%
4 DL BLER <=2% 81.84% 75.8%
5 Soft Handover Success Rate (SHO SR) 100% 97.42%
Video Call KPIs
6 Call Setup Success Rate (CSSR) 100% 100%
7 Call Drop Rate (CDR) 0% 6.35%
8 Call Success Rate (CSR) 100% 73.65%
9 DL BLER <=2% 86.01 89.73%
10 Soft Handover Success Rate (SHO SR) 99.46% 97.08%
Coverage KPIs
11 RSCP above -95 dBm 95.25% 99.9%
12 EcNo above -12 dB 84.35% 97.29%
13 UETxPower below 0 dBm 92.37% 94.46%
Item No. Voice Call KPIsBest Performing
Network
1 Call Setup Success Rate (CSSR) MTN
2 Call Drop Rate (CDR) MTN
3 Call Success Rate (CSR) MTN
4 Block Error Rate<% (BLER<2% ) MTN
5 Soft Handover Success Rate (SHO SR) MTN
Video Call KPIs
8 Call Setup Success Rate (CSSR) Same
9 Call Drop Rate (CDR) MTN
10 Call Success Rate (CSR) MTN
11 Block Error Rate<% (BLER<2% Airtel
12 Soft Handover Success Rate (SHO SR) MTN
Coverage KPIs
13 RSCP above -90 dBm Airtel
14 EcNo above -12 dB Airtel
15 UETxPower below 0 dBm Airtel
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1.2 Drive Test Route
Note: The Drive test route is not plotted yet because of unavailability of the route plan.
Figure 1: Drive Test Route
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2 SECTION 2: COVERAGE / VOICE CALLS
2.1 Voice Accessibility
Table 1: MTN Accessibility Stats
Accessibility Results - CS
Call Attempts 1
Successful RRC Connection Setups 1
Successful Call Setups 1
Failed Call Setups 0CS Call Re-establishment fail 0RRC Connection Setup Success rate 100%CS Call Setup Success rate 100%
Table 2: Airtel Accessibility Stats
Accessibility Results - CS
Call Attempts 3
Successful RRC Connection Setups 4Successful Call Setups 2
Failed Call Setups 1
CS Call Re-establishment fail 0
RRC Connection Setup Success rate 100%
CS Call Setup Success rate 66.7%
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Figure 2 : CSSR (Voice)
As seen in the chart, the accessibility statistics show that MTN is better than Airtel in the tested
area.
2.2 Call Drop Rate
Table 3: MTN Retainability Stats
Retainability Results - CS
Number of Drop Call 0
Drop Call Rate 0%
UE Tx Power (Max) 8.9
UE Tx Power (Mean) -13.87
UE Tx Power (Min) -46.8
DL BLER (Average) 82
DL BLER, 95th
Percentile 9.9
Table 4: Airtel Retainability stats
Retainability Results - CS
Number of Drop Call 1
Drop Call Rate 50%
UE Tx Power (Max) -0.9
UE Tx Power (Mean) -24.37
UE Tx Power (Min) -46.1
DL BLER (Average) 438
DL BLER, 95th
Percentile 31.4
0%
20%
40%
60%
80%
100%
MTN AIRTEL
100%
66.70%
CSSR
CSSR
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Figure 3: Voice Call Drop Rate
MTN drop call rate is better than that of Airtel in the driven area as can be seen in the chart
above.
2.1.3 Block Error Rate<2%
Table 5: BLER<2%
MTN Airtel
Block Error Rate <2% 82.93 75.8
Figure 4: BLER<2% (Voice)
0%
10%
20%
30%
40%
50%
MTN AIRTEL
0%
50%
CDR
CDR
72.00%
74.00%
76.00%
78.00%
80.00%
82.00%
84.00%
MTN AITEL
82.93%
75.80%
BLER<2%
BLER<2%
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2.4 SHO Success Rate
Table 5 : MTN SHO stats
SHO Results - CS# e1a 139
# e1b 138# e1c 71# e1d -# Unknown -Total HO Events 348# Measurement Reports 546# Active Set Updates 348# Active Set Update Completes 348# Measurement Control 0
SHO Success Rate 100%Active Set Update Completion Rate 100%
Table 6: Airtel SHO Stats
SHO Results -CS
# e1a 299# e1b 295# e1c 83# e1d -# Unknown -
Total HO Events 677# Measurement Reports 759# Active Set Updates 677# Active Set Update Completes 663# Measurement Control 0SHO Success Rate 98.4%ActiveSet Update Completion Rate 98.38%
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Figure 6: Voice SHO Success Rate
MTN network has 100% while Airtel has 97.42% in the test area. MTN performs better than Airtel
in term of SHO success rate as seen in the chart above.
3 SECTION 3: VIDEO
3.1 Call Setup Success Rate Video
Table 7: MTN video Accessibility stats
Accessibility Results - CS
Call Attempts 12
Successful RRC Connection Setups 13Successful Call Setups 2
Failed Call Setups 9
CS Call Re-establishment fail 0
RRC Connection Setup Success rate 100%
CS Call Setup Success rate
96%
97%
97%
98%
98%
99%
99%
100%
100%
MTN AIRTEL
100%
97.42%
SHO SR
SHO SR
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Table 8: Airtel Accessibility Stats
Accessibility Results - CS
Call Attempts 63
Successful RRC Connection Setups 75
Successful Call Setups 7Failed Call Setups 56
CS Call Re-establishment fail 0
RRC Connection Setup Success rate 100%
CS Call Setup Success rate
Call Setup Success Rate
Figure 7 : CSSR (Video)
From the chart above, it shows that both MTN and Airtel perform excellently well in term of Call
Setup Success Rate.
3.2 Call Drop Rate
Table 9: MTN Video Retainability Stats
Retainability Results - CS
Number of Drop Call 0
Drop Call Rate 0%
UE Tx Power (Max) 20.2
UE Tx Power (Mean) 9.5UE Tx Power (Min) -45.4
0%
20%
40%
60%
80%
100%
MTN AITEL
100% 100.00%
CSSR
CSSR
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DL BLER (Average) 479
DL BLER, 95th
Percentile 30.3
Table 10: Airtel Video Retainability Stats
Figure 8: Call Drop Rate (Video)
CS Video call drop rate of MTN network is better in comparison with Airtel as seen in the Call
Drop Rate above.
3.3 SHO Success Rate
Table 11: MTN Video SHO stats
SHO Results - CS
# e1a 86# e1b 79# e1c 20# e1d -# Unknown -Total HO Events 185# Measurement Reports 229
0%
1%
2%
3%
4%
5%
6%
7%
MTN AITEL
0%
6.35%
CDR
CDR
Retainability Results - CS
Number of Drop Call 4
Drop Call Rate 6.35%UE Tx Power (Max) 14.2UE Tx Power (Mean) -17.17UE Tx Power (Min) -35DL BLER (Average) 263DL BLER, 95
tPercentile 21.3
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# Active Set Updates 185# Active Set Update Completes 184# Measurement Control 0SHO Success Rate 99.46%Active Set Update Completion Rate 99.45%
Table 12: Airtel Video SHO stats
SHO Results - CS
# e1a 64# e1b 45# e1c 24# e1d -# Unknown -Total HO Events 143# Measurement Reports 176
# Active Set Updates 133# Active Set Update Completes 129# Measurement ControlSHO Success Rate 97.07%Active Set Update Completion Rate 97.08
Figure 9: SHO SR (Video)
MTN network is having 99.46% while Airtel has 97.04% in the tested area which shows that MTN
performs better.
Table 13: Overall Video stats
UE Type Metric MTN Airtel
Video Service# Call Attempts 12 63
# Call Successes 12 7
95.50%
96.00%
96.50%
97.00%
97.50%
98.00%
98.50%
99.00%
99.50%
MTN AIRTEL
99.46%
97.07%
SHO SR
SHO SR
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Metrics Call Setup Success Rate 100% 100%
Call Drop Rate 0% 6.35%
# SHO Events 185 143
Average BLER 479 263
Call Completion Success Rate 99.46% 97.08%
Figure 10: BLER <2% (Video)
Airtel is performing better in term of Block Error Rate <2% in comparison with MTN as seen in
the chart above.
84.00%
85.00%
86.00%
87.00%
88.00%
89.00%
90.00%
MTN AIRTEL
86.01%
89.73%
BLER<2%
BLER<2%
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3.4 Network Coverage
Received Signal Code Power(RSCP)
Figure 11: Percentage of RSCP >-95dBm
FIGURE 10: MTN RSCP
92.00%
93.00%
94.00%95.00%
96.00%
97.00%
98.00%
99.00%
100.00%
MTN AIRTEL
95.25%
99.90%
Percentage of RSCP>-95dBm
Percentage of RSCP>-
95dBm
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FIGURE 11: AIRTEL RSCP(dBm)
As seen in the plots Airtel network has better coverage in the tested area, 99.9% of coverage
route is covered by Airtel WCDMA signal with RSCP above -95dBm in comparison to 95.25%
coverage of MTN WCDMA signal.
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Carrier -to-Noise Ratio
Figure 12: Percentage of Ec/No >-12dBm
FIGURE 12: MTN Ec/No
75.00%
80.00%
85.00%
90.00%
95.00%
100.00%
MTN AIRTEL
84.35%
97.29%
Percentage of Ec/No >-12dBm
Percentage of Ec/No >-
12dBm
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FIGURE 13: AIRTEL Ec/No (dBm)
The signal quality (Ec/No) of Airtel is also better than MTN in the tested area. At driven routes
Airtel network has 97.29% samples with Ec/No above -12 dB, while MTN has 84.35%respectively.
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UE Transmission Power
Figure 13: Percentage of UE Tx Power >0dBm
FIGURE 14: MTN UE Tx Power(DBm)
91.00%
91.50%
92.00%
92.50%
93.00%
93.50%
94.00%
94.50%
MTN AIRTEL
92.37%
94.46%
UE Tx Power <0dBm
UE Tx Power <0dBm
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FIGURE 15: AIRTEL UE Tx Power (dBm)
As seen from UE Tx Power data, both Airtel and MTN are performing well in term of UE Tx
Power. The UE uses a bit less power while connected to both Airtel WCDMA network and MTN
WCDMA network. Though, Airtel is approximately 2% better than MTN (i.e Airtel is having94.46% in comparison with MTN that is having 92.37%.
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4 SECTION 4: SMS
4.1 SMS Success Rate
Table 14: SMS success rate
SMS MTN Airtel
SMS Success Rate 100.00% 100.0%
Figure 16 : SMS Success Rate
4.3 Some Findings and Recommendations
MTN needs to lower down the level of pollution by adding more sites if possible, to improve the
network performance in the area. This will also improve the Block Error rate and coverage which
is not as good as Airtel network in the area.
0%
20%
40%
60%
80%
100%
MTN AIRTEL
100% 100%
SMS Success Rate
SMS Success Rate
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5 SECTION 5: Appendices
5.1 Key Performance Indicator General Descriptions
Call Setup Success Rate (CSSR) = number of successful call setups / number of call setup
attempts
The Call Setup Success Rate Speech (CSR Speech) is defined as the ratio of successful call
setups, divided by the total number of call setup attempts for speech calls. It is the probability of
successfully initiating a speech call from an end user perspective.
CSSR Speech measured by Drive tests, presents the proportion of speech calls which are
successfully setup by the initiating party.
Calculated with Counter Statistics, CSR Speech is a product of the RRC Setup Success Rate
and the RAB Setup Success Rate for Speech within a cell or RNC.
This formula indicates the success rate of RAB establishments for Speech calls. Note that the
total number of attempts of RAB establishments is decreased by the number of attempts
outgoing via interRAT handover to GSM due to capacity reasons.
The pmNoRab EstablishAttemptSpeech counter is increased just after successful RAB Speech
Mapping, when a RANAP RAB Assignment Request message is received from the CN with
Speech RABs to be setup or modified, while pmNoRabEstablishSuccessSpeech is increased
after successful RAB Speech Establishment, after sending the RANAP RAB Assignment
Response message to the CN. Both counters will only be incremented in the SRNC for the Best
Cell. The pmNoDirRetryAtt counter is triggered when sending Relocation required message (after
Directed Retry to GSM was
initiated). The counter is stepped for the cell where the RRC connection was established and will
only be incremented in the SRNC.
This KPI can be computed on a per RNC basis as well as a per cell basis. When computing the
RNC result, individual cell counters should be summed on a RNC basis before applying KPI
calculation.
This is in contrast to applying the KPI equation to each cell and then taking an average across
the RNC. The latter can give poor performances.
This formula can give some strange fluctuation about percentage values if calculated on celllevel.
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This behaviour has not been observed on RNC level. The KPI is useful to identify cells which
exhibit poor RAB Speech establishment.
NOTE:
This formula represents the percentage of successful RRC Connection Requests over the total
number of RRC Connection Requests decreased by the number of diversions due to the Load
Sharing feature during the establishments of RRC Connections, so that it is not counted as
access failure on WCDMA RAN.
As soon as an RRC Connection Request message is received by RNC from UE for any
Establishment Cause, pmTotNoRrcConnectReq counter is triggered and if UE has selected
anothercell (inter-frequency), due to Load Sharing mechanism, pmNoLoadSharingRrcConn
counter is stepped when the RRC message RRC Connection Reject is sent to the UE. Then
RNC asks permission both from RNC Main Processor (MP) load control and admission control
functions. Havingreceived permission to continue, allocates a DL channelization code and then
starts to set up a connection towards the RBS. Also the UE is requested to setup an RRC
connection with RRCConnection Setup message. Once NBAP Radio Link Restore Indication
message and RRCConnection Setup Complete message have been received by RNC, then the
RRC connection is considered to be successfully established. The counter
pmTotNoRrcConnectReq Success is now increased.
Call Drop Rate (CDR) = number of drops / number successful call setups
The Drop Call Rate Speech (DCR Speech) is defined as the ratio of abnormal call
disconnections, divided by the total number of successful call setups for speech calls. It is the
probability of successfully holding and terminating a call once it has been successfully initiated.
DCR Speech measured by Drive tests, presents the proportion of speech calls which are
successfully released after a specified holding time from when the call was successfully setup.
Calculated with Counter Statistics, DCR Speech is the ratio of abnormally released calls dividedby the sum of the abnormally and normal released Speech RABs within a cell or RNC.
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The KPI defines the drop rate for RAB Speech. It can be seen as the ratio between all the
abnormal RAB Speech releases over the total number of all the RAB Speech releases
The pmNoNormalRabReleaseSpeech and pmNoSystemRabReleaseSpeech counters are only
increased due to a RANAP Iu Release Command or RAB Assignment Request message for
RABSpeech respectively with “release cause” = ’Normal Release’, ’Successful Relocation’,
’Resource Optimisation Relocation’, ’User Inactivity’ or ’release-due-to-UE-generated-signalling-
connection release’ for the first one or anything except the previous causes for the second one.
For UtranCell class these counters are incremented for the best cell in the Active Set in the
SRNC.
All the counters involved in the formula are available in two different MOs: UtranCell and IurLink.
If an analysis of RAB Drop Rate at Iur level or RNC level is required (instead of Cell level), It’s
possible to collect data related to these counters with MO “IurLink” or “UtranCell” respectively,and in the latter case aggregate them on all the cells belonging to the RNC. Note also that, in
case of activation of AMR, in this formula are present all the releases of AMR code RABs.
When computing the RNC result, individual cell counters should be summed on a RNC basis
before applying KPI calculation. This is in contrast to applying the KPI equation to each cell and
then taking an average across the RNC. The latter can give incorrect results.
Call Completion Success Rate (CSR) = CSSR * (1 - drop call rate)
The Call Completion Success Rate Speech (CSR Speech) is defined as the ratio of successfulnormal call disconnections, divided by the total number of call setup attempts for speech calls. It
is the probability of successfully initiating, holding and then terminating a speech call from an end
user perspective.
CSR Speech measured by Drive tests, presents proportion of speech calls which are
successfully set up, held and released by the initiating party.
Calculated with Counter Statistics, CSR Speech is a product of Accessibility [Call Setup Success
Rate (CSSR) Speech] and Retainability [1 - Drop Call Rate (DCR) Speech] within a cell or RNC.
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Soft Handover Success Rate (SHO SR) = Number of successful SHOs/Number of SHO
attempts
100 *( pmRlAddSuccessBestCellSpeech/ pmRlAddAttemptsBestCellSpeech)
The KPI defines the success rate for Speech RL addition, defined for the source best cell in the
active set. It is calculated as the rate between the sum of RL addition success for speech RAB
and the sum of RL addition attempts for speech RAB.
The pmRlAddSuccessBestCellSpeech counter is increased when a new RL is attempted to be
added to an active set for a CS Speech RAB. The counter is increased after a handover proposalhas been received from the handover evaluation function or an RNSAP Radio Link Addition
Request has been received, admission control has been granted, DL channelization code has
been allocated for the new cell, RL Setup or RL Addition procedure is successfully completed
with the RBS, the Active Set
Update procedure is successfully completed with the UE, the necessary ATM resources have
been set up between RBS and RNC, and the appropriate parameters are available.
ThepmRlAddAttemptsBestCellSpeech counter is increased when a new RL is attempted to be
added to an active set for a CS Speech RAB. The counter is increased after a handover proposal
has been received from the handover evaluation function or an RNSAP Radio Link Addition
Request has been received. All these counters only monitor RLs for cells in the SRNC. If an RLis replaced in an active
set, this counter is also stepped.
This KPI can be computed on a per RNC basis as well as a per cell basis. When computing the
RNC result, individual cell counters should be summed on a RNC basis before applying KPI
calculation.
This is in contrast to applying the KPI equation to each cell and then taking an average across
the RNC. The latter can give incorrect results.
Inter System Handover Success Rate (IRAT HO SR) = Number of successful IRAT HOs /
Number of IRAT HO attempts
The Inter Radio Access Technology Handover Success Rate for Speech (IRAT Speech) is
defined as the ratio of successful handovers to GSM over the number of attempted handovers to
GSM. It is the probability of successfully performing a handover from WCDMA to GSM and
continuing the call without end user interruption.
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IRAT Speech Handovers can be measured either by Drive tests or Statistics data although due
to difficulties in drive test collection, Statistics is recommended. In the case of a drive test, a
normal drive within the coverage area may not have sufficient number of samples where IRAT
handover is performed and it is recommended that a separate drive route along the borders of
the coverage be
covered. Calculated with Statistics, IRAT Speech is a ratio of the number of successful
Handovers over the number of attempted handovers. The counters are only incremented if a
GSM relation exists between the Target and the Source Cell where the Source cell is the Best
Cell in the Active Set. This can be aggregated to Cell and RNC level
This KPI defines the percentage of successful non blind Inter Frequency Handovers for CS
Speech, over the total number of non blind Inter Frequency Handover attempts for CS speech.
The pmSuccNonBlindInterFreqHoCsSpeech12 Counter provides the number of successful non-
blind outgoing inter-frequency handovers for RAB = Conversational speech. After Handover
Evaluation has decided to initiate interfrequency handover for a CS speech RAB, the UE is
ordered to move to a new frequency by sending an RRC Physical Channel Reconfigurationmessage. When a successful response, RRC Physical Channel Reconfiguration Complete is
received from the UE, this counter is stepped. The counter is stepped for the best cell in the
active set but only if that cell has a cell relation towards the target cell. If the best cell in the active
set has no cell relation towards the target
cell, the counter is not stepped. Note: In case of a multi-RAB combination, the counters
corresponding to each type of RAB involved shall be incremented.
The pmAttNonBlindInterFreqHoCsSpeech12 provides the number of attempted non-blind
outgoinginter-frequency handovers for RAB = Conversational speech After Handover Evaluation
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has decided to initiate inter frequency handover for a CS speech RAB, the UE is ordered to move
to a new frequency by sending an RRC Physical Channel Reconfiguration message. This
counter is stepped after that message is sent. The counter is stepped for the best cell in the
active set but only if that cell has a cell relation towards the target cell. If the best cell in the active
set has no cell relation towards the target cell, the counter is not stepped. Note1: The handover
evaluation decision is based on measurements performed by the UE on the target frequency.Note2: In case of a multi-RAB combination, the counters corresponding to each type of RAB
involved shall be incremented.
This KPI can be computed on a per RNC basis as well as a per cell basis. When computing the
RNC result, individual cell counters should be summed on a RNC basis before applying KPI
calculation.
This is in contrast to applying the KPI equation to each cell and then taking an average across
the RNC. The latter can give incorrect results.
Compressed Mode Time = Time spent in compressed mode / Full calls duration time
VIDEO
Call Setup Success Rate (CSSR)
The Call Setup Success Rate CS64 (CSR CS64) is defined as the ratio of successful call setups,
divided by the total number of call setup attempts for video calls. It is the probability of
successfully initiating a video call from an end user perspective.
CSSR CS64 measured by Drive tests, presents the proportion of video calls which are
successfully setup by the initiating party.
Calculated with Counter Statistics, CSSR CS64 is a product of the RRC Setup Success Rate and
the RAB Setup Success Rate for Video within a cell or RNC.
Call Drop Rate (CDR)
The Drop Call Rate CS64 (DCR CS64) is defined as the ratio of abnormal call disconnections,
divided by the total number of successful call setups for CS64 (video) calls. It is the probability of
successfully holding and terminating a video call once it has been successfully initiated.
DCR CS64 measured by Drive tests, presents the proportion of video calls which are
successfully released after a specified holding time from when the call was successfully setup.
Calculated with Counter Statistics, DCR CS64 is the ratio of abnormally released calls divided bythe sum of the abnormally and normal released calls for Video RABs within a cell or RNC.
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Call Completion Success Rate (CSR)
The Call Completion Success Rate CS64 (CSR Video) is defined as the ratio of successful
normal call disconnections, divided by the total number of call setup attempts for video calls. It is
the probability of successfully initiating, holding and then terminating a video call from an end
user perspective.
CSR Video measured by Drive tests, presents proportion of speech calls which are successfully
setup, held and released by the initiating party.
Calculated with Counter Statistics, CSR Video is a product of Accessibility [Call Setup Success
Rate
(CSSR) Video] and Retainability [1 - Drop Call Rate (DCR) Video] within a cell or RNC.
Soft Handover Success Rate (SHO SR)
100 *( pmRlAddSuccessBestCellCsConvers/ pmRlAddAttemptsBestCellCsConvers)
The KPI defines the success rate for RL addition, defined for the source best cell in the active
set. It is calculated as the rate between the sum of RL addition success for CS64 conversational
RABs and the sum of RL addition attempts for CS64 conversational RABs.
The pmRlAddSuccessBestCellCsConvers counter is increased when a new RL is attempted to
be added to an active set for a conversational CS64 RAB. The counter is increased after a
handover proposal has been received from the handover evaluation function or an RNSAP Radio
Link Addition
Request has been received, admission control has been granted, DL channelization code has
been allocated for the new cell, RL Setup or RL Addition procedure is successfully completedwith the RBS, the Active Set Update procedure is successfully completed with the UE, the
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necessary ATM resources have been set up between RBS and RNC, and the appropriate
parameters are available.
The pmRlAddAttemptsBestCellCsConvers counter is increased when a new RL is attempted to
be added to an active set for conversational CS 64 RAB. The counter is increased after a
handover proposal has been received from the handover evaluation function or an RNSAP RadioLink Addition
Request has been received. This counter only monitors RLs for cells in the SRNC. If an RL is
replaced in an active set, this counter is also stepped.
This KPI can be computed on a per RNC basis as well as a per cell basis. When computing the
RNC result, individual cell counters should be summed on a RNC basis before applying KPI
calculation.
This is in contrast to applying the KPI equation to each cell and then taking an average across
the RNC. The latter can give incorrect results.
5.2 List of Abbreviations
KPI Key Performance Indicator
CSSR Call Setup Success Rate
BLER Block Error Rate
SHO Soft Handover
RSCP Received Signal Code Power
EC/No Carrier- to- Noise Ratio
UE User Equipment
Tx Transmitter