Abha CS Drop Enhancement - Report

8/2/2019 Abha CS Drop Enhancement - Report

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1 Highly Confidential

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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


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


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


cells of the 2nd group

38% Improvement


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DL RL Power Trial 3rd Batch CS Drop Rate


cells of the 3rd group

24% Improvement


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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

Abha CS Drop Enhancement - Report

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