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Improve Call Setup Succes Rate

Viewing 15 posts - 16 through 30 (of 33 total)
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  • #46278 Reply
    nachi
    Guest

    Hi All,
    Iam having low CSSR due to message failure at assignment level,what could be causing that.On other instances i have High immediate assighnment withiot MS_Seizure.I would appreciate if i can get an explaination on the same.
    Possible solutions to counter low CSSR will be appreciated.
    Rgds
    Nachi

    #46279 Reply
    Pix
    Guest

    Low CSSR due to poor assignment success…

    First, which assignment ? The SDCCH or the TCH ?

    Possible low CSSR (depending on your CSSR formula !!)

    SDCCH congestion
    poor radio conditions on BCCH

    poor radio conditions on SDCCH

    TCH congestion
    poor radio conditions on TCH (unable to access the ts TCH)

    and hardware failure : abis, combiner, tre, crossed tre, crossed sectors, etc…

    regarding IMMEDIATE ASSIGNMENT, the possible failure cause is mostly SDCCH congestion. Check the SDCCH traffic and resources usage, you might notice you’re exceeding the offered traffic.

    Regards,

    #46280 Reply
    Rajiv Gujral
    Guest

    Hi Pix,

    In my pointof view Immediate Assignment will never be due to SDCCH Congestion. SDCCH congestion may cause SDCCH Allocation failure. Poor SDCCH assignment success rate can be due to CO BCCH CO BSIC conflicts, poor quality, VSWR and other h/w failure.

    #46281 Reply
    Rajiv Gujral
    Guest

    Hi Pix,

    The CSSR in my network is ~90 in most of the cells even when there is no SDCCH assignment failure, no TCH assignment failure, no allocation failures, no blocking on SD adn TCH. Can u suggest me at which end(MSC, BSC, BTS) i will look to improve my CSSR.

    Regards

    #46282 Reply
    adeel
    Guest

    hi,
    1.in Tems Investigation report, whats is the definition of call attempt, call setup, call established, and call ended?
    2.i have seen that sometimes number of call established in not equal to no. of calls ended, why?

    Kindly help me

    #46283 Reply
    akefa
    Guest

    Rajiv,
    I think your 90% CSSRs are due to the different between the sdcch attemps and sdcch assignment. If you type the formula of the CSSR used in your network, things will be more clear.

    #46284 Reply
    lycan
    Guest

    need help on how to solve Sdcch Assign Failures… thanks for all the help.

    #46285 Reply
    EUGE2007
    Guest

    Hi guys, how can one effectively push traffic to 1800Mhz band if the 900Mhz is congested in HCS systems.

    #46286 Reply
    pix
    Guest

    Euge2007,

    i don’t know the E/// system, yet I believe they are using a kind of “capture” handover from 900 to 1800. Check their handover types.

    #46287 Reply
    Fahim
    Guest

    Hi,

    If there is congestion in A channels and call assignment failure occures due to that – then will it be considered as call drop in radio ?

    #46288 Reply
    pix
    Guest

    fahim,

    no the call hasn’t been established yet, so this is a call setup failure, and more exactly, it is a TCH assignment failure.

    regards,
    pix

    #46289 Reply
    Fahim
    Guest

    Hi Pix,

    U have made my conception clearer – thnx. Can you tell me any other KPI in A-channels which might affect cal drop or CSSR in radio ?

    #46290 Reply
    pix
    Guest

    every kind of failures on the a interface would lead to a call drop or a call setup failure, isn’t it ?
    but it’s a bit tedious to list all of them.. i’m not going to do it 🙂

    #46291 Reply
    mohit kumar gupta
    Guest

    what is sd drope & cssr ?

    #46292 Reply
    pix
    Guest

    sdcch drop : drop during the sdcch phase (could be for LU, call setup, SMS, …)

    CSSR : call setup success rate : failure or drop during any phase between a channel request and the succesful establishment of a TCH. It includes the SDCCH drops, TCH assignment failures, sometimes also, the SDCCH assignment failures . It is vendor dependent.

    regards,
    pix

Viewing 15 posts - 16 through 30 (of 33 total)
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