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DL Qual HO rise

Viewing 11 posts - 1 through 11 (of 11 total)
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  • 14th January 2010 at 11:56 #60677
    TheDarkKnight
    Guest

    Hi,

    The DL Quality HO % has suddenly increased for one of our BSCs. No parameter changes were made as such, and cell level analysis showed DL Quality Handovers increased on ALL of the approx 250 cells of the BSC. ANy recommendations as to how this can be troubleshooted?

    Vendor is Nokia 2G.

    Thanks/

    15th January 2010 at 05:00 #60678
    Bijoy
    Guest

    Any S/W upgradation??

    15th January 2010 at 22:50 #60679
    TheDarkKnight
    Guest

    Thanks for your reply, Bijoy.

    No, actually, there was no SW Upgrade at all. The %HO due to DL Quality for the rest of the BSCs has remained stable. What’s more is that the %HO due to UL Qual for this BSC has also remained consistent.

    Any ideas?
    Thanks/

    16th January 2010 at 07:22 #60680
    Bijoy
    Guest

    Is there is a dip in DL RX qual values too.if yes please re-check your freq plan or transmission media.If no,please re-check your DL qual HO triggering parameters.Maybe u can compare with a normal BSC.

    Br\\
    Bijoy

    22nd January 2010 at 08:02 #60681
    TheDarkKnight
    Guest

    Yes, there has also been a dip in the RxQual values for 90% of the cells. The BSC covers sites located in different cities, so we can rule out external interference issues. Please do provide some details as to what exactly we should check, such as on the transmission media?
    Many thanks for your help!

    22nd January 2010 at 08:41 #60682
    Bijoy
    Guest

    Please check the Slips on ET’s by “ZYMO”.
    Also check if there is any 7601 alarm–“Difference between PCM and base station frequency reference.”

    Check if your BSC Clock is OK.

    22nd January 2010 at 15:07 #60683
    TheDarkKnight
    Guest

    Yes, in fact, the alarm 7601 is appearing on around 10 sites (BCFs) of this BSC. I am also going to have the ZYMO for these sites run. Do you have any idea what exactly could be causing the problem?
    Again, REALLY appreciate your help..

    22nd January 2010 at 15:37 #60684
    TheDarkKnight
    Guest

    And the ZYMO command for one of the ETs shows slips:

    SLIPS:
    POSITIVE NEGATIVE
    43 15

    Please do advise on how to proceed! Do we need any hardware replacement?

    23rd January 2010 at 07:06 #60685
    Bijoy
    Guest

    What about the BSC clock?What is its Word value?Also how the BSC clock is extracted?
    As per your data,it seems a media issue,please seek help of some Tx guy to have the media diagnostic report.

    Br\\
    Bijoy

    24th January 2010 at 23:12 #60686
    TheDarkKnight
    Guest

    Yes, I have been discussing the case with Tx and Ops guys as well. The first step will be the removal of the 7601 alarm. I am also trying to get data and stats related to the BSC Clock of this BSC.

    Thanks again/

    27th January 2010 at 19:47 #60687
    TheDarkKnight
    Guest

    Ops have confirmed that the alarm 7601 is occurring only because some sites are on VSAT.
    But still, could this be the reason for the DL Quality degradation?

    Thanks/

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