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SD drop contributor

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  • #52182 Reply

    Good day to all, just want to look for your ideas regarding high SD Drop factors in a site????
    BTS has no alarm btw…
    thanks much!

    #52183 Reply

    path unbalance (poor tx or poor rx in the bts, usually, it doesn’t generate alarms)

    in some vendors, the sdcch drop also contains the sdcch congestion, so check that out also

    and finally, you can check the SDCCH average duration. If it’s higher than 6 or 7 seconds on most cells of your network, there might be an issue during the authentication phase (dialog with HLR)

    #52184 Reply

    Also if you use Nokia… and Nokia formulas… they include phantom RACHs in the SD drop, and cleim that 10 to 15% is normal 🙂

    #52185 Reply

    SD drop depends on formula used. considering phantom raches in this formula is a little bit weird. To Drop on SD you should have reached this SD. so , from my point of view (and my customer point of view 🙂 ) SD_drops are considered after SABM is received from MS. in that case Phantom raches do not impact sd_drop.

    On the other and you have to defined an other KPI to check SD seizure

    #52186 Reply

    we can breakdown SD drop per cause. If we knew the cause than we have suspect.

Viewing 5 posts - 1 through 5 (of 5 total)
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