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REDUCED SIGNAL STRENGTH SHARPLY

Viewing 8 posts - 1 through 8 (of 8 total)
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  • #47409 Reply
    EEE
    Guest

    HI EVERYBODY
    “WHEN MS MOVES AROUND A STREET CORNER, THE SIGNAL STRENGTH REDUCES SHARPLY AND CALL DROPS BEFORE MAKING HANDOVER TO STRONGEST CELL”
    What can I do for this situation? (Ericsson Systems)
    thanks

    #47410 Reply
    Ahmed
    Guest

    hi EEE
    dropped call happen by this state:
    *you have strong interference if u want to reduce this state u must be change the frequency of the cell that u call setup.
    *call dropped happen when your MS try to handover but other cell is full(no TCH empty).
    Best regards

    #47411 Reply
    EEE
    Guest

    thanks ahmed but
    here the problem is low signal strength on serving cell after move the corner. and no handover occure to the strongest cell and finally call drops due to low signal strength altough there are strong signal strength.
    help me PIX

    #47412 Reply
    Pix
    Guest

    Hello EEE,

    It is a very typical problem, that is encountered for most micro cells in many cities. Many solutions can be used, depending on your mobile network architecture :

    multiband ? (upper band, lower band, indoor band ?)
    mono band ?
    what kind of handovers do you perform to enter your micro, and to exit your micro ?

    in alcatel, there is a special type of handovers that exist, for all cells which are defined as “MICRO” type. This handovers will provide a quick exit from micro cells to neighbours cells, as soon as the Rxlev is below a certain threshold (whether or not power control is applied), or as soon as the number of “bad decoded SACCH frames” exceed a certain amount.

    Do you have such emergency HO for micro cells ?

    otherwise, you can reduce HO_MARGIN and reduce the POWER BUDGET averaging window between micro cells.

    And finally, you can also decrease the “emergency HO due to low signal strength in DL” threshold to exit a micro cell (for instance -85dBm instead -92 dBm)

    Hope it helps,

    Regards,
    Pix

    #47413 Reply
    Bowie
    Guest

    I don’t know how to solve this problem on Ericsson network, but in Nokia you can use Rapid Field Drop HO option. You need to define “chained adj cell”.

    #47414 Reply
    senarist
    Guest

    hello EEE
    I agree to PIX and in addition to
    you can check OSS(Operating Support System)data for this site.You can checks power control parametre value at the same time hardware checks in the site(for example antenna tilt hight,azimuth and Tx,Rx antena cable…)this site maybe serving at the small area.

    #47415 Reply
    Tufail
    Guest

    Hi EEE

    I think you need to decrease AWOFFSET so that HO are enabled to worst cell.

    thanks
    Tufail

    #47416 Reply
    Danish
    Guest

    In this caes kinly rule out the possibility of rapid power control if everthing at the carrier level is within limits

    Regards,

    Danish

Viewing 8 posts - 1 through 8 (of 8 total)
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