Find the source of external interference without using spectrum analyzer?

RAN
1

Hello Experts.

Does any vendor equipment logs provide info on external interference?

What are the ways of working to find the source of external interference, except spectrum analyzer?

2

Huawei – Online and Offline FFT Scan.

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3

There are performance counters per each PRB.

Like in Huawei you have Channel Quality Measurements

Counters:

  • L.UL.Interference.LinearAvg (Linear average value of PRB-level interference noise detected in the uplink.
  • L.UL.Interference.Max.PRBx (Maximum interference and noise received by PRB x in a cell)
  • (where x is PRB 0,1,2 etc)

With max and average interference.

And if for PRB x the max and average interference is the same, very high like -90 dBm, then there is external interference!

Of course this depends also on P0_Nominal_PUSCH settings.

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4

I sometimes use NEMO Outdoor to locate external interference, like repeaters, other operators’ faulty RRUs, etc. Before it I check KPI (high RTWP, Average NI of carrier, etc), and approximately map the location. Also I search for repeaters visually :slight_smile:

Good luck!

Before
Before1280×620 144 KB

After
After1280×591 132 KB

Stat
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