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Phanthom RACH

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  • 18th February 2009 at 02:52 #55862
    Phanthom RACH
    Guest

    Can anybody help me ?
    I am working with Alcatel BSS now I have a few confuses in my work

    1. What is Phanthom RACH
    2. How it effect with Radio KPI such SDCCH Drop or Failure? or TCH Drop or Failure
    3. How we can cancled it

    18th February 2009 at 04:25 #55863
    Phanthom RACH
    Guest

    Also, I often found some cells face high SDCCH Drop everyday (~ 100 time/hr.) and it occurs only around 1 to 6 am. then after this period it falls down to normal ( 2-5 times /hr.)

    20th February 2009 at 13:43 #55864
    Chris
    Guest

    At least NSN/Nokia BSS has algorithm which detects, if RACH is real one or phantom one, and if I remember correctly, there’s one counter in statistics, where you see how many phantom RACH msg has been received within the measurement period.

    20th February 2009 at 14:59 #55865
    pix
    Guest

    phantom rach,

    we talked a lot about phantom rach in the previous days, have a look to older posts…

    23rd February 2009 at 04:26 #55866
    Phanthom RACH
    Guest

    OK .Thank you so much Pix and Chris for your reply .-_-

    23rd February 2009 at 13:42 #55867
    HSH
    Guest

    Dear,
    Phantom, dummy or Ghost, are the same;
    RX lev. of MS higher than cell acceptability (RACH MINI. access lev.) or may be higher than its TA acceptability (MAX TA) because of:
    – Overshooting: need physical parameter adjustment.
    – BSS parameters: need BSS parameter adjustment(TA MR Control parameter, Access level control parameters, RACH Access control parameter …).
    – Interference.
    and the main effect will be on SDCCH performance.

    regards

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