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Virtual Timing advance

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  • #67861 Reply
    suhail
    Guest

    Does any body know what is Virtual Timing advance. How can it be activated on Alcatel GSM system

    #67862 Reply
    pix
    Guest

    hi suhail,

    i’ve never read about this in GSM. Could you please share your sources ?

    regards
    pix

    #67863 Reply
    paraHO
    Guest

    hi pix

    In an extended range cell, the timing advance corresponding to the real signal delay (measured in the BTS) is called Virtual Timing Advance (VTA). VTA is the timing advance that would have been used if the air interface protocol had allowed a
    TA larger than 63. When VTA is larger than 63, the time slot next to the one assigned is also needed for reception. At
    immediate assignment the BSC extracts the VTA value from the
    random access delay information it receives from the BTS.
    When the call is established, VTA is regularly sent from the
    BTS to the BSC.

    #67864 Reply
    pix
    Guest

    hi,

    thanks paraHO ! we don’t do it this way in alu.

    cheers
    pix

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