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High interference in uplink

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  • 6th July 2009 at 21:47 #57814
    Rex
    Guest

    Hi,
    in one cell there is very high interference in uplink. Interference band 5 is high, Cause HO due to quality in uplink is over 50%, in downlink is OK. Call drop also increased. So, I assume is pure interference. BCCH planning is OK in the area. We made drivetest measurement, we didn’t noticed anything suspicious. After changing TREs and combiners, still the same. But, near the site there is a military base. Could be that caused from jammers or something else? What should we check more? How to measure unwanted signal. We don’t have frequency scanner.
    Please help.

    7th July 2009 at 10:03 #57815
    Pix
    Guest

    Hello Rex,

    You checkd BCCH planning, but not TCH planning ?
    You should.

    Are you using hopping ?
    In this case, disable hopping and perform a call in each frequency, nearby the military base.
    Identify which frequency is blocked (perhaps they all are !!)

    Regards,
    Pix

    7th July 2009 at 10:38 #57816
    Rex
    Guest

    Hi Pix,
    Thanks a lot. We will try that and see results.
    Regards,
    Rex

    11th July 2009 at 17:42 #57817
    Rex
    Guest

    Hi Pix,
    All frequencies from the band our operator uses were interfered. We tried with another operators frequencies and no interference found. After some talks with military base found that they’ve switched on the jammer.
    BR,
    Rex

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