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Poor GPRS Attach Success Rate

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  • #58746 Reply

    Hi all,

    I have a severe problem of poor GPRS Attach Success.
    1. What are the reasons for Attach fail?
    2. There are 2 counters that show exceptionally high values
    a) FAIL_GPRS_Attach_Due_SGSN_ERR
    There is no documentation available anywhere.

    Can anyone pl help me out on this issue?

    Thanx in advance!!

    #58747 Reply

    1.Illegal MS,LA not allowed,Illegal ME,GPRS service nor allowed,Gr fail,Ge fail,No suitable cell in LA & protocol error.
    To answer the 2nd part,can I know what are the reasons for Attach failure in your system

    #58748 Reply


    Amongst all the failure causes given by you, I have already checked & found that failures are more due to the already mentioned counters. There is no hard blocking & soft blocking is well under control!
    And I am looking for the reasons for the attach fails!!! RF part is being considerably taken care of..But I am doubting the behavior & communication of SGSN with self & other fellas.

    #58749 Reply

    Sorry for the late reply Bijoy. The site seemed to be down for some days. Anyways, just to share with you, I changed the INIT MCS (DL/UL) from 6/5 to 2/1 & I got good improvement in the Attach Success rate!!!

    #58750 Reply

    what parameters you can use for improvement GPRS Attach succes rate for Ericsonn equipement ?

    #58751 Reply

    What will be the possible reasons for Poor Email send and receive success rate

    #58752 Reply
    to MAC (ghamiz)

    Hi mac…
    well m a bit confused, as the error causes that you had mentioned (FAIL_GPRS_Attach_Due_SGSN_ERR & FAIL_GPRS_Attach_HLR_VLR_ERR) are purely core end and protocol related issues, so how come changing initial coding schemes improved the attach success rate? did u see improvement in VLR and SGSN errors as well or they are intact…???

    waiting for your response..

Viewing 7 posts - 1 through 7 (of 7 total)
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