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# Idle Band Interference

• This topic has 6 replies, 1 voice, and was last updated 5 years ago by Adekunle Aderibigbe.
Viewing 7 posts - 1 through 7 (of 7 total)
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• #54646
Pioneer
Guest

What are the causes of Idle Band Interference (in Alcatel)?

and how we can combat?

Apreciate if any one help me with these.

#54647
pix
Guest

it’s either interference or hardware problems (too much EM noise generated by BTS, combiner, TRX or antenna, perhaps connectors)

check values per TRX

if you write the values here, i can explain and help you more.

regards,
pix

#54648
Pioneer
Guest

Find the value per TRX

Sector A:
TRX1:
Seized TCH Total=447
# of interfered call DL=32
interfered call DL rate=7.6
TRX2:
Seized TCH Total=6149
# of interfered call DL=581
interfered call DL rate=9.45
TRX3:
Seized TCH Total=6
# of interfered call DL=1
interfered call DL rate=16.76
TRX4:
Seized TCH Total=3437
# of interfered call DL=314
interfered call DL rate=9.14

Sector B:
TRX1:
Seized TCH Total=4690
# of interfered call DL=198
interfered call DL rate=4.22
TRX2:
Seized TCH Total=223
# of interfered call DL=42
interfered call DL rate=18.83
TRX3:
Seized TCH Total=2444
# of interfered call DL=397
interfered call DL rate=16.24

Sector C:
TRX1:
Seized TCH Total=610
# of interfered call DL=82
interfered call DL rate=13.44
TRX2:
Seized TCH Total=0
# of interfered call DL=0
interfered call DL rate=0
TRX3:
Seized TCH Total=0
# of interfered call DL=0
interfered call DL rate=0

Rigards

#54649
pix
Guest

you gave me the amount of “Noisy Calls”, it’s an RMS indicator. Aren’t there the interference bands measurements per TRX ?

Maybe I’m wrong, those indicators are not available per TRX. I can check tomorrow.

The indicators you gave are not obvious indicators, they shall be interpreted in regards with other indicators. I call such indicators “secondary”, in the sense that they don’t allow you to assess the quality of the cell. They can simply confirm a prior analysis.

At first glance, maybe the sector B is interfered.

#54650
Pioneer
Guest

As you mentioned, there is no idle band interference indicator per TRXs in the RNO.

I notice that the idle band interference is always accompanied with a high rate of noisy calls; so I thought you may ask about noisy call indicators.

#54651
pix
Guest

So, anyway, the idle band interference shows the level of the noise on the frequencies of the cell.
idle band 1 means that the noise is between x dBm and x dBm
idle band 2, btw x dBm and x dBm, etc

check the properties of the counters to know what are the values of “x”.

If most of the noise is between -47dBm and -70dBm for example, it means there are a lot of interference
If the noise is mostly between -100 and -110dBm, then it means there is no interference (noise is very weeak).

These measurements are done in uplink only, it reflects the uplink noise (heard by the BTS)

#54652