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Diffrence b/w CSSR & CSR ??

Viewing 10 posts - 1 through 10 (of 10 total)
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  • #61420 Reply
    Mohit
    Guest

    Hi All,

    Can anybody explain the diff. between CSSR & CSR.

    Thnxs in advance..

    Regards,
    Mohit

    #61421 Reply
    Mohit
    Guest

    Hi Pix,

    Help me also, I know u can…

    Regards,
    Mohit

    #61422 Reply
    pix
    Guest

    Mohit,

    Just have a look at the indicator formula…

    CSSR = (1 – TCH ASSIGN UNSUCCESS RATE) * (1 – SDCCH DROP RATE)

    CSR = (1 – CALL DROP RATE) * CSSR

    For example :
    CSSR = 95%
    CDR = 10%

    Therefore the CSR = 90% * 95% = 85.5%

    The CSR is just a mega-KPI, aggregating CSSR and CDR within one indicator. Useless for troubleshooting, but nice for management reporting.

    Cheers
    pix

    #61423 Reply
    ATTO
    Guest

    Hello ,

    In other terms the CSSR is the percentage of calls successfully established ( set up ) and CSR ( Call success rate) is the rate of calls going until normal release.

    Regards.

    #61424 Reply
    Mohit
    Guest

    Many thnx to both of you.

    Regards,
    Mohit

    #61425 Reply
    ADEEL
    Guest

    HI MOHIT,

    Bro conceptually its very simple..as the name suggests , CSSR , is only about the call setup success…which means if the traffic channel assignment is done ,regardless of whether the call is dropped later on through an abnormal release(none or just one of the two user entities completing the release), it is considered a setup success…the reference here is obviously , total number of calls made by the user…

    However , CSR ,tells us the percentage of calls that follow a normal release (both user entities completing the release or other normal causes such as release iniated by IN through the msc , when balance ends…)..the reference here is again the total number of calls made by the user..thats y its always aggregated with the CSSR value…
    we always get,CSSR>CSR REALISTICALLY…

    #61426 Reply
    Too Fresh Optimizer
    Guest

    Dear All
    Dear Pix

    If we have some cells with very low CSSR , how can we optimize them ??
    i mean which parameters we have to check and wat is the solution ?

    Thanks in advance

    #61427 Reply
    pix
    Guest

    hi,

    check the cause of bad cssr:
    sd drops ?
    tch congestion ?
    tch assign failures ?
    sd assign failures ?

    cheers

    #61428 Reply
    Too Fresh Optimizer
    Guest

    Thnx pix for ur concern

    we have a high sd drop

    thnx

    #61429 Reply
    CAM CHARLY
    Guest

    the difference between CSSR & CSR is that;

    CSSR call setup success rate is the rate of total call setup attempt you remove call fail divide by total call setup attemp *100

    the basic formulat is

    CSSR= ((Nb of call attempt- call fail)/ Nb of call)*100

    for exemple
    you have
    nb of call attempt= 1000
    call fail = 20

    your cssr will be =((1000-20)/1000)*100
    = 98%

    CSR is call success rate

    it is CSSR- call drop

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