vi external interference report

8/7/2019 VI External Interference Report

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All Rights Reserved Alcatel-Lucent 2006, #####

Victoria Island External Interference Report


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All Rights Reserved Alcatel-Lucent 2010

The KPI improved after new GSM FP implementation (17th and 18th November 2010 WK1046), onthe other hand the external interference increased one week later from 30th till today, degradingKPI in VI specially the UL Quality

Most all GSM cells in VI affected by the external interference: LAG025, LAG054, LAG055, LAG110,LAG129, LAG212, LAG402, LAG505 and LAG944.

2 | VI external interference report | 28 March 2011


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external interference

The external interference appeared one week after AFP implementation



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Call drop Radio

Good improvement after AFP implementation, UL interference appears

at 30th of November moreover the DL quality still ok

GSM FP



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External interference (hourly)

The signal broadcasted is not constant during the time



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External interference (hourly)


The signal broadcasted is not constant during the time


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Frequency Scan has been done on Victoria Island using spectrum analyzer, the signal broadcasted is not constant

UL band : 900.2 MHz to 904.8 MHz

Also the external interference affects the entire GSM band

Below the snapshots for some area affected by the external interference



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Alcatel office facing LAG053_S3 (no external interference)



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LAG129_S3



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Eko Hotel entrance



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LAG402 (Inside the site)



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LAG402 (outside the site)



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LAG505_S3



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Conclusion

From 18th (AFP implementation) till 30 of November the KPIs improved on UL

and DL quality despite the reduction of the BCCH number, the degradationappeared with presence of the external interference.

This degradation was mainly observed in the UL, the DL still ok

Unfortunately this external interference affects the entire GSM band,changing of BCCH frequencies will not resolve this issue.

A complaint should be sent to NCC to localize the interfered source and

resolve the problem definitively


vi external interference report

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