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Thread: Immediate Assignment failure

  1. #1
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    Default Immediate Assignment failure

    Hi all ,


    What is the reason of Immediate Assignment failure in idle mode?

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  3. #2
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    Default Reasons of immediate assignment failure

    Dear,
    Reasons below:
    - SDCCH Congestion
    - Phantom or dummy RACH,
    - H/W (TRX, Combiner, diplexers, VSWR)
    - Radio (Coverage, Interference, DL/UL unbalance, ...)

    I hope can help,

    Regards

  4. #3
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    Default

    also we have expired timers and co bcch and co bsic === phantom rach
    (T10 < T_MSRFPCI),
    FR call: (T_MSRFPCI Expiry)
    FR call: (T10 Expiry)
    Unsuccessful TCH assignment procedure LAPDm I-Frame
    with ASSIGNMENT COMMAND not acknowledged by MS
    (T200 Expiry), FR call
    Last edited by ghassen; 2009-06-24 at 08:12 PM

  5. #4
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    Default

    Totally all the mentioned reasons posted are causes and if you want to be sure why you have this fail it is beteer to check what the requirement for channel request(MOC,MTC,location update,ememrgency,,,,,,,) ao when you find your request is high for one of them you can understand what is causes.
    BR
    RF

  6. #5
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    Default

    Dear friend thanks for your help

    Finally i found the problem!

    Problem was in radio link LOS!! after radio realignment problem solved



    Regards

  7. #6
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    Default

    Quote Originally Posted by electron View Post
    Dear friend thanks for your help

    Finally i found the problem!

    Problem was in radio link LOS!! after radio realignment problem solved



    Regards
    then it was T_MSRFPCI counter EXPIRED???

  8. #7
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    Default

    Quote Originally Posted by ghassen View Post
    then it was T_MSRFPCI counter EXPIRED???
    N200 Expired !

  9. #8
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    Default

    Friends, can you give me some information about Phantom RACH
    and how to optimize it?

  10. #9
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    Default

    Quote Originally Posted by justdream View Post
    Friends, can you give me some information about Phantom RACH
    and how to optimize it?
    Phantom RACH is kind of non real channel request some time BTS decode noise as channel request and you can reduce it by change Parameter related to RACH and RX leve access min or RACH access min
    BR
    RF

  11. #10
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    Default

    Quote Originally Posted by RF engineer View Post
    Phantom RACH is kind of non real channel request some time BTS decode noise as channel request
    BR
    RF
    Thanks but in this way, can subcounters count the total number of Phantom RACH

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