164187728-2G-Cluster-Optmization-Sample-Report.pdf

Pulse Information Technologies

Title

2G Cluster Drive Test Report

Network

: XXXXX

Phase

: XX

Drive Date

: XX/XX/XXXX to XX/XX/XXXX

Report Date : XX/XX/XXXX

Signature Prepared by

Checked by(PULSE)

Approved by(Operator)

1


Contents 1.

EXECUTIVE SUMMARY. ..................................................................................................................................................... 3

2.

TEST SETUP. ........................................................................................................................................................................... 3

3.

DT PERFORMANCE. ............................................................................................................................................................ 4 3.1 3.2 3.3 3.4 3.5

4.

ANALYSIS & RECOMMENDATION FOR BAD EVENTS/PATCHES ...................................................................... 9 4.1 4.2 4.3 4.4 4.5 4.6 4.7

5.

2G RX LEVEL VARIATION (IDLE). ........................................................................................................................................ 4 2G RX LEVEL VARIATION (DEDICATED MODE).................................................................................................................... 5 2G RX QUALITY VARIATION. ............................................................................................................................................... 6 TIMING ADVANCE(TA) VARIATION. ..................................................................................................................................... 7 BAD EVENTS: ...................................................................................................................................................................... 8 IDLE UE COVERAGE – SAMPLE PATCHES -01 ...................................................................................................................... 9 DEDICATED MODE UE COVERAGE – SAMPLE PATCHES -01 .............................................................................................. 10 DEDICATED MODE UE QUALITY – SAMPLE PATCHES -01 .................................................................................................. 11 DEDICATED MODE UE DROPPED CALL – SAMPLE PATCHES-01 ......................................................................................... 12 DEDICATED MODE UE HANDOVER FAILURE – SAMPLE PATCHES-01 ................................................................................ 13 DEDICATED MODE UE BLOCKED CALL– SAMPLE PATCHES-01 ......................................................................................... 14 DEDICATED MODE UE PING-PONG HANDOVER– SAMPLE PATCHES-01 ............................................................................ 15

CONCLUSION ..................................................................................................................................................................... 16

2


1. Executive Summary. This document is a report for the sample cluster drive in "xxxx" area. This will provide all the issues found in the field during the drive test with root cause analysis. The following activities have been taken during the network optimization of mentioned Cluster. • Physical Verification of Sites for any discrepancies in implementation versus planning data. • Parameter consistency checks and implementation of Change Requests if required. • Coverage optimization by means of physical changes at site. • Neighbor Relations – Added & Deleted during optimization.

2. Test Setup. Following devices and tools used during this cluster drive & Optimization to analyze network performance by means of accessibility, mobility & retain ability.

Devices Configuration Device Type of

Mode

Duration

MS1

Call Idle

2G Locked

From Start to End

MS2

Voice Call

2G Locked

30 Sec. Call/ 10 Sec idle between

MS3

Voice Call

MS4

Scanner

2G Locked

Comments

calls to allow reselection 30 Min. Call/10 Sec idle between calls to allow reselection 2G Scanner

Tools; 

TEMS Investigation 13.1



TEMS Discovery 3.2.1



MapInfo professional 11.0



Actix Analyzer 4.05

3


3. DT Performance. 3.1 2G Rx Level variation (Idle).

Figure 3.1.1 : 2G Idle Rx Level Variation

Figure 3.1.2 : Histogram view of 2G Idle Rx Level Variation

4


3.2

2G Rx Level variation (Dedicated Mode).

Figure 3.2.1 : 2G Dedicated Rx Level Variation

Figure 3.2.2 : Histogram view of 2G Dedicated Rx Level

5


3.3

2G Rx Quality variation.

Figure 3.3.1 : 2G Rx Quality Variation

Figure 3.3.2 : Histogram view of 2G Rx Quality

6


3.4

Timing Advance(TA) variation.

Figure 3.4.1 : Timing Advance Variation

Figure 3.4.1 : Histogram view of Timing Advance Variation

7


3.5

Bad Events:

TBALE 3.5.1 : Event KPI & Cluster Acceptance Level Integrity

Events & Impairments

No. of Occurrences

Call Attempts

Xxx

CS Accessibility Call Setup failures

Mobility

Xxx

CSR (Target 99.99%)

Xxx

Handover Attempt

Xxx

Handover Failures

Xxx

HSR (Target 99.5%)

Xxx

Location update attempt

Xxx

Location update failures

Xxx

LAC Update SR (Target 99.99%) Xxx Retain ability

Call Setup Complete

Xxx

Drop Call (Target 99.3%)

Xxx

8


4. Analysis & Recommendation for Bad events/patches 4.1 Idle UE Coverage – Sample Patches -01

Analysis Approach: 1. Physical optimization : 

The building obstructions in coverage path of main serving cell must be checked since this is dense urban cluster.



Proper Azimuth & tilts must be applied and impact must be also checked then and there.



Recommendations for new site or cell splitting or external power booster (Downlink).

2. Parameter optimization : 

Enhancing the parameter control downlink power boost technology.



The serving cell idle BA list (Neighbor list) & access permitted parameter (NCCPERM) must be rechecked in order to have proper cell resection.



Cell resection controlling parameters (CRO, TO and PT) can be tuned so that cell would initiate the resection at proper condition. Bot operator defined default values also will be also taken into consideration.

9


4.2

Dedicated Mode UE Coverage – Sample Patches -01

Analysis Approach: 1

Physical optimization :



Identify the best server & Proper Azimuth/tilts must be ensured.



Alarm free RBS operation must be ensured (reading RBS Alarm log).



The building obstructions in coverage path of main serving cell must be checked (cell relocation may require) since this is dense urban cluster.



According to the coverage demand & subscriber density, the antenna type can be changed



Recommendations for new site or cell splitting or external power booster (Downlink).

2

Parameter optimization :



BA list & Neighbor tuning.



RBS & Channel power control parameters retune(Ex: BSPWRB, BSPWRB, BSPWRMIN so )

10


4.3

Dedicated Mode UE Quality – Sample Patches -01

Analysis Approach: 1

Physical optimization :



Interferer Identification & Elimination of overshooting cells (Can be double checked by cell level measurement report recoding) with proper tilt planning.



Frequency reuses pattern analysis & new BCCH/BSIC planning.

2

Parameter optimization :



Interferer channel power control parameters retune.



Improving performance by fine tune the better cell handover parameters.



Hooping, AMR and HR/FR controlling parameter retune.

11


4.4

Dedicated Mode UE Dropped call – Sample Patches-01

Analysis Approach: 

Dropped call reasons (Ex: Hardware issue, Quality issue, Signaling issue, traffic demand analysis so on...) identification & proper remedies.



Monitoring Call drops rate for busy and non-busy hours using row stats.



Cable SWAP tracing, identification & rectification (all the way from dTRU to Antenna Tx/Rx Port).



Uplink interference analysis & recommendation for TMA.



‘Call trace’ log analysis.

12


4.5

Dedicated Mode UE Handover Failure – Sample Patches-01


Handover Failure causal (Ex: Hardware issue, TCH unavailability, BA list tuning, Missing neighbor etc) identification & proper remedies.



Monitoring handover attempt & HSR for busy and non-busy hours using row stats.



Cable SWAP tracing, identification & rectification (all the way from dTRU to Antenna Tx/Rx Port).



Uplink interference analysis & recommendation for TMA.



Impairments analysis in handover control parameters.

13


4.6

Dedicated Mode UE Blocked Call– Sample Patches-01


Resource Availability analysis (Ex: SDCCH, TCH & PDCH) & recommendations for capacity expansion.



HCS parameter tuning for dual band cell or different channel group.



Optimizing the availability of resources with a proper parameter tuning (Ex: AMR/HR/FR & Dynamic PDCH allocations).

14


4.7

Dedicated Mode UE Ping-Pong Handover– Sample Patches-01


The overlapping coverage zone of serving cell & candidate cells must be identified & restricted properly with proper Azimuth/tilt planning.



Locating parameter also can be used to tune the handover performance.

15


5. Conclusion The report shows the clear picture of the 2G network performance according to the cluster Drive Test carried out. The above mentioned bad patches and the events were thoroughly analyzed with the drive test logs, OSS KPI and the RNC parameter configurations and the recommendations have been made. Once you approved the recommendations we will do the necessary modifications and then the DT will be carried out to show the network performance has improved.

****End of Document*** 16

164187728-2G-Cluster-Optmization-Sample-Report.pdf

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