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PS Drop while on FACH (3G)

Viewing 6 posts - 1 through 6 (of 6 total)
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  • #68940 Reply
    Pix
    Guest

    Hi,

    In ericsson W12, is there any reason for a PS data transfer (interactive background) to drop while being on FACH ?
    – HS and EUL drops are fine.
    – Other cells in the same sector are fine.
    – Speech is fine

    Apart from the huge FACH drop rate (about 20% !), you would say the cell is perfectly fine…

    Any guess is welcomed. Any better technical description of the problem would be great too, as I’m still learning…

    thanks

    pix

    #68941 Reply
    pix
    Guest

    ok, i understood that the FACH is totally overloaded on that specific cell. I suspect that’s because of an inter-RNC neighbour right in front of it, so lots of HS->FACH downswitch.
    Drops are caused by channel overload.

    #68942 Reply
    ater
    Guest

    OK load could be an issue but how do you know that the channel is loaded?
    On the other hand as this is a border cell. How are your mobility phase1 and phase2 settings?
    Have you tried to increase the power of the channel?

    #68943 Reply
    pix
    Guest

    hi ater,

    Issue disappeared after the micro 3G site right in front of my problematic cell was swapped –> as soon as it was put in the same RNC, the FACH drop disappeared.

    The root issue wasn’t caused by FACH load, as I supposed few weeks ago. Drops occured because it isn’t possible to do a inter-RNC SHO when in FACH. The FACH is supposed to be dropped before the UE moves to the inter-RNC neighbour. It’s a normal behaviour (at least in ericsson).

    Regards
    pix

    #68944 Reply
    mkt
    Guest

    Pix
    The tilt formula you mentioned few years back ,
    What to do in case of 4 degree tilt as 4-8/2 equals to 0 and tan 0 is zero.
    This gives result as infinity.

    Pl correct if wrong.

    #68945 Reply
    pix
    Guest

    it just means the upper lobe is pointing parallel to the horizon ( some might call it “horizontally”).

    Just draw it, it will make sense i hope.

    Cheers
    pix

Viewing 6 posts - 1 through 6 (of 6 total)
Reply To: PS Drop while on FACH (3G)
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