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border country_high sd drop

Viewing 10 posts - 1 through 10 (of 10 total)
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  • #63678 Reply
    GMN
    Guest

    hi all
    can any one help me to find the reason about high sd drop in border of country?(eicsson)

    #63679 Reply
    pix
    Guest

    Poor coverage ? Fast moving mobiles ? Location update failures (taking too much time to complete).
    If radio conditions are good, then the easiest way is to perform an A interface trace or a drive test (the problem surely comes from location update).

    regards
    pix

    #63680 Reply
    bm
    Guest

    What can we do to improve? I have a big SOR problem which reflects LU failures and sdcch drops?

    #63681 Reply
    GMN
    Guest

    Hi Pix
    u are right.but pls consider it is border between 2 country .is it some thing important which need to check as well or there is no differences?

    #63682 Reply
    pix
    Guest

    it is possible the registration (with the loc upd in the new country) takes too much time and the SDCCH is dropped.
    Or perhaps the network doesn’t reply at all, keeping the SDCCH alive until it drops.

    It is a difficult topic where I would really start a study by doing a drive test or a trace (because I have no experience about this specific problem).

    regards
    pix

    #63683 Reply
    Cool
    Guest

    Hi All

    I’ve started facing same problem. Suddenly SD drop increased in our border sites. It has gone from 5500 to 19000 in BSC level.

    Not finding any reason. If i go through the breakdown of drop, I’m getting t200 failure & increased suddenly.

    What actually can happen in border area.
    So far i know a flood took place on the other side. SD attempt increased abnormally.

    Any idea ???

    #63684 Reply
    Density
    Guest

    Hi All,

    I have also experienced this problem on my network (also ericsson) and up to now we haven’t found a solution.

    My suspicion is that, subs in the neighbouring country are trying to register on my network. As to what will cause this, I do not know.

    In my case, it occurred on the borders to three different countries… ALL AT THE SAME TIME. Really spooky.

    Any help/contribution would be appreciated.

    #63685 Reply
    pix
    Guest

    hi,

    if “alien” sites are down, then the subs will tend to reselect neighbour cells. But if none is available, then they will (wildly) look for a cell from a different PLMN (= yours).

    You can’t avoid this. The best for you would be to do a roaming agreement and accept those incoming visitors. As soon as their site is up, they will camp back on the home PLMN.

    (note : this scenario is just an assumption ! i’m not saying it is what’s happening.)

    #63686 Reply
    SHELDON
    Guest

    This is an amazing story.

    I also suspect the problem might be coming from subs in the neighbouring country attempting to register on your network…but then I have a problem with this theory.

    During Cell Selection/Reselection, isn’t the MS supposed to select an “allowed” PLMN? If there is no “allowed” PLMN and the MS selects another PLMN(your PLMN in this case), it is supposed to go into “Limited Service” state, isn’t it? In this state is the MS allowed to request for a channel on a PLMN which is not “allowed”?

    I would suggest you visit the border of your country and buy a SIM card of the neighbouring operators and doing a test registration on your PLMN. If the MS is allocated an SDCCH, then you can conclude the problem is coming from the foreign MSs.

    BRs

    #63687 Reply
    pix
    Guest

    yep, the MS can attempt a Location Update on any PLMN. And doing the LU requires a SDCCH.

    whether the PLMN is allowed or not, i’m not sure what’s the impact. But this has to be hard coded in the SIM, which is probably not the case.

    Don’t moan. ROAM. 😀

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