How to Analyze CI BER and Intererence in DT

HUAWEI TECHNOLOGIES CO., LTD. Huawei Confidential

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How to Analyze C/I,BER and Interference In DT

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Interference

Hardware Problem TRX Problem Feeder & Arrester Problem

Intra-Interference Adjacent channel & Co-channel Intermodulation Interference

Inter-Interference Other Equipment





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Co-Channel & Adjacent Channel Interference

As beside Figure show Station A~D, Supposing the frequency N have already allocated to cell A-3.so frequency N can not be allocate to A1 、 A2 、 B1 、 B2 、 B3 、 C1 、

C2 、 C3 、 D1 、 D2 、 D3; and frequency N±1 can not be allocated to cell A1 、 A2 、 A3 、 B1 、 C2 、 D1 、

D2 (No ,hoping)





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Co-Channel & Adjacent Channel Interference

As below, From the neighbor list ,BCCH 73 interfered BCCH 72,it is adjacent interference. When the co channel or adjacent channel happen

It will bring the strong interference. The typical phenomena:

High RxlevWorst Rxqual





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C/I Problem

C/I Definition C/I: Carry/Interference Optimize C/I method

Improve Coverage Decrease Interference





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C/I Problem due to poor coverage

RxLevel(Serving Cell) is about (or less than) -95 dBm;RxLevel(Neighbours Cell) is about (or less than) -95 dBm;Result: Worst C/I due to poor coverage.

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C/I Problem due to poor coverage

RxLevel(Serving Cell) is about (or less than) -95 dBm;RxLevel(Neighbours Cell) is about (or less than) -95 dBm;Result: Worst C/I due to poor coverage.





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BER

BER: Bit Rate Error





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The solution to Interference,C/I,BER issue (1)

Interference Issue Solution

Serious interference due to Co-channel or Adjacent channel Adjust cell frenquency

Serious interference due to feeder or Arrester Problem

Check whether the Feeder and antenna tightening, or direct replacement its.





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C/I Issue Solution

Worst C/I due to poor coverageImprove coverage by adjusting antenna azimuth and downtilt or add new sites

Worst C/I to interference Ensure the interference source and solution as interference solution.





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BER Issue Solution

Worst BER due to poor coverageImprove coverage by adjusting antenna azimuth and downtilt or add new sites

Worst BER due to interference Ensure the interference source and solution as interference solution.

Worst BER due to Transmission Checking transmission alarm in M2000

Worst BER to TRX At first check equipment alarm in M2000,ensure which TRX is problem

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How to Analyze CI BER and Intererence in DT

Documents

adjusting

worst ber

channel amp

ber issue

poor coverage

neighbours

serving cell

arrester problem