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very low CSSR

Viewing 6 posts - 1 through 6 (of 6 total)
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  • 1st October 2009 at 13:41 #59002
    may
    Guest

    i’m facing a very low CSSR on some E/// cells can you help please?
    what is the meaning of Uc on DRU E/// rbs 2216

    4th October 2009 at 15:54 #59003
    Bijoy
    Guest

    pls explain in detail

    5th October 2009 at 13:05 #59004
    may
    Guest

    I have some few cells with low cssr around 45%,since we launch the sites those cells never rich 50%, i don’t have any congestion (TCH or SD)

    5th October 2009 at 22:31 #59005
    Rex
    Guest

    Hi may,
    what’s the rate of sdcch drop and tch assignment success?
    BR,
    Rex.

    6th October 2009 at 08:53 #59006
    may
    Guest

    Hi Rex,

    the average of sddrop on 10 days is 0.83%
    the tch assignment success is around 99%
    but the SD_Assi_Succ_Rate still very low around 70%

    9th October 2009 at 15:12 #59007
    mouf
    Guest

    Probable Reasons

    · No Response to Immediate Assignment
    One reason why the MS does not respond to the immediate assignment could
    be low signal strength.
    Action:
    – Check dropped calls due to low signal strength.
    – Check ratio of calls disconnected at low signal strength.
    Solution:
    Improve coverage.

    · High Interference
    Action:
    – Check Interference Þ chapter 12.
    Solution:
    Perform a frequency reallocation.

    · Random Access Burst from Another Co-Channel, Co-BSIC Cell
    Action:
    – Check BSIC and frequency plan Þ chapter 15.
    Solution:
    Change BSIC or frequency.

    · More than one RA burst send from a mobile during one call setup
    Action:
    – Check downlink interference.
    – Check related parameters: ACCMIN, MAXRET, TX
    Solution:
    Change frequency and parameters.

    · Phontom Random Access
    Some noise is interpreted as Random Access burst, but no SDCCH will be
    allocated to it.
    Action:
    – Field measurement

    · BTS handware or link failure
    Action:
    – Check BTS error log

    · Power balance problems
    Action:
    – Check power balance related parameters
    Solution:
    Change paramters.

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