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Abha CS Drop Rate EnhancementReport
1 June 2011
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Agenda
Overview
Impact
DL RL Power Trial
1A/1B Relative Threshold Trial
Physical Optimization Actions
Summary
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Motive:
High CS Drop Rate in Abha city (Highest city in South Region)
Target:
Decreasing the CS Drop Rate by parameter tuning
Method:
1- Changing the parameter RL Max DL TX power to be 30 (3 dB) instead ofdefault value 0 (0 dB) on the worst cells distributed in 3 batches.
Meaning: This parameter specifies the maximum DL RL power to be assigned.
And the value is relative to PCPICH transmit power
2- Changing the 1A and 1B event relative threshold from 3 to 4 dB and 6 to 7 dB
respectively for voice only on 2 batches for whole Abha city
Overview
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Impact on KPIs
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Impact on CS Drop Rate Abha City
The CS Drop Rate has 33% improvement, decreased from 0.59% to 0.397%
(Comparing this weeks average with the average of 2 weeks before any action)
RL Power Trial 1st ,2nd
and 3rd Batches
1A/1B Threshold Trial 1st
and 2nd Batches
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Impact on CS Traffic Abha City
The speech traffic increased by 29% but not only due the actions , it is also due other causes too:
user behavior, Mobily offers
RL Power Trial 1st ,2nd
and 3rd Batches
1A/1B Threshold Trial 1st
and 2nd Batches
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Impact on Other KPIs CSSR Abha City
The CSSR remains stable after the actions (All the peaks were due to outages)
RL Power Trial 1st ,2ndand 3rd Batches
1A/1B Threshold Trial 1st
and 2nd Batches
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DL RL Power Trial
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Impact:
The CS Drop Rate for Abha had 24% improvement, decreased from 0.59% to 0.45%
DL RL Power Trial
Changed Parameter:
RLMAXDLPWR From 0 (0 dB) to 30 (3 dB)
Description:
Changing the parameter RL Max DL TX power to be 30 (3 dB) instead of
default value 0 (0 dB) on the worst cells distributed in 3 batches.Meaning: This parameter specifies the maximum DL RL power to be assigned.
And the value is relative to PCPICH transmit power
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DL RL Power Trial 1st Batch CS Drop Rate
The CS Drop Rate had 35% improvement, decreased from 0.96% to 0.62% on the
cells of the 1st group
35% Improvement
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DL RL Power Trial 2nd Batch CS Drop Rate
The CS Drop Rate had 38% improvement, decreased from 0.7% to 0.43% on the
cells of the 2nd group
38% Improvement
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DL RL Power Trial 3rd Batch CS Drop Rate
The CS Drop Rate had 24% improvement, decreased from 0.82% to 0.62% on the
cells of the 3rd group
24% Improvement
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1A/1B Relative Threshold Trial
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1A/1B Relative Threshold Trial
Impact:
The CS Drop Rate for Abha had 12% improvement, decreased from 0.45% to 0.397%
Changed Parameters:
INTRARELTHDFOR1ACSNVP From 6(3 dB) to 8(4 dB)
INTRARELTHDFOR1BCSNVP From 12(6 dB) to 14(7 dB)
Description:
Changing the 1A and 1B event relative threshold from 3 to 4 dB and 6 to 7 dB
respectively for voice only on 2 batches for whole Abha city
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1A/1B Relative Threshold Trial - 1st Batch CS Drop Rate
1st Batch
8/5/2011
The CS Drop Rate had 12 % improvement, decreased from 0.45% to 0.4% on the
cells of the 1st group
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2nd Batch
16/5/2011
The CS Drop Rate had 7 % improvement, decreased from 0.463% to 0.427% on the
cells of the 2nd group
1A/1B Relative Threshold Trial 2nd Batch CS Drop Rate
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1A/1B Relative Threshold Trial Impact on SHO Factor
1st Batch
8/5/2011
2nd Batch
16/5/2011
The SHO factor increased slightly (From average 33.45% to average 36.2%) without
any increase in any kind of congestion
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Physical Optimization
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Physical Optimization - Samples
Many physical optimization actions done in the last period to improve the RSCP
and Ec/No (Tilt/Azimuth modification or PCPICH adjustment)
Sample 1: (Azimuth Modification)
Before After
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Physical Optimization - Samples
Sample 2: (Tilt Modification)
Before After
Sample 3: (PCPICH Adjustment)
Before After
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Comparison Between Drive Tests RSCP Before
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Comparison Between Drive Tests RSCP After
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Comparison Between Drive Tests RSCP Statistics
There is slight improvement in the
good RSCP samples after the
Physical optimization actions
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Comparison Between Drive Tests Ec/No Before
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Comparison Between Drive Tests Ec/No Before
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Comparison Between Drive Tests Ec/No Statistics
There is a noticeable improvement in
the good Ec/No samples after the
Physical optimization actions
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33% Improvement in CS Drop Rate for Abha city, decreased from 0.59% to 0.397%
The CS Traffic increased by 29% No degradation in CS/PS CSSR
No increase in congestion
The SHO factor increased slightly (From average 33.45% to average 36.2%)
The radio conditions are enhanced after physical optimization
Summary
CS Drop Rate - Abha City
RL Power Trial Improved by 24% (From 0.59% to 0.45%)
1A/1B Thresholds Trial Improved by 12% (From 0.45% to 0.397%)
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Thanks