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PAGING OVERLOAD

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  • #68551 Reply
    Mahmoud
    Guest

    Dears,

    Do you know the situations that BSC send PAGING OVERLOAD to MSC? And what action should be done by MSC?

    Br,
    Mahmoud

    #68552 Reply
    Mahmoud
    Guest

    Any body can help please?

    #68553 Reply
    pix
    Guest

    Hi,

    I wasn’t aware of such message, it’s interesting.
    Paging overload is probably a BSC defense mechanism. The BSC has a paging processing limit, which is usually reached when you mapped too many LAC in your BSC.

    for example :
    BSC 1 = LAC 1, 2, 3, 4, 5, 6
    BSC 2 = LAC 1, 2, 3, 4, 5, 6
    BSC 3 = LAC 1, 2, 3, 4, 5, 6

    Each BSC is handling 6 LAC. That means that the MSC is sending a lot of pagings to each BSC.

    If you do something like this :
    BSC 1 = LAC 1, 2
    BSC 2 = LAC 3, 4
    BSC 3 = LAC 5, 6

    then each BSC is still handling the same amount of cells, and each cell is still sending the same amount of pagings (1/6th of the whole network pagings, assuming the 6 LAC have equal size)
    but each BSC is handling 3 times less pagings -> the paging processing is much less than before.

    cheers
    pix

    #68554 Reply
    Tanuj
    Guest

    Hi Mahmoud
    If the no. of cells is very high in one LAC then BSC sends this message to MSC, we dealt with this problem by splitting the LAC in the BSC

    #68555 Reply
    Mahmoud
    Guest

    Thanks for your help.
    I found bellow description which can be useful for others, so I share with you:

    in 3.1.12.1 of TS 48008. Brief description of the algorithm is provided as follows:
    1. A total of 15 flow control levels are available.
    2. The MSC first starts T5 (30s). In the period specified by T5, the system does not change the flow control level. After T5 expires, the system starts T6 (also 30s).
    3. In the period specified by T6, if the system receives an Overload message again, it decreases the flow control level by 1 and restarts T5. If T6 also expires, the system increases the flow control level by 1 and restarts T5.
    4. The preceding steps occur alternatively. To prevent restriction of all services, level 1 is set as the lowest flow control level. When the flow control level increases to level 15, the system ends flow control.

    The flow control algorithm aims to protect the BSC against soaring traffic

    Br,
    Mahmoud

    #68556 Reply
    pix
    Guest

    cool, thanks for the info.

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