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RAB Drop Problem

Viewing 10 posts - 1 through 10 (of 10 total)
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  • #52611 Reply
    Nitin
    Guest

    Hello,

    Can any one explain what are the reasons behind RAB drop in UMTS?

    Regards,

    Nitin

    #52612 Reply
    John
    Guest

    I would say the reason is either coverage or sw bug, typically.

    #52613 Reply
    Nitin
    Guest

    Hi John,
    Thanks for the reply,

    I had checked missing neighbours, coverage, S.C etc. But it looks like ok. I had seen RAB drop rate heigh in many cells. So except sw bug, is their any other possibility for RAB Drop?

    Regards,

    Nitin

    #52614 Reply
    John
    Guest

    Hi,

    Of course the drop can also happen due to some BTS issue, pre-emption, integrity check failure of some RRC message during e.g. radio bearer reconfiguration procedure (which happens failure often during UMTS nrt data call) & release from PS core (e.g. mismatch in Tias/Tiar timers between Core & RNC). I have also seen some UEs, which are using RRC:signallingConnectionReleaseIndication for PS CN wrongly and this is seen as RAB drop by some vendors’ RNC.

    #52615 Reply
    Nitin
    Guest

    So need to play with some parameters to solve these problem?
    Is yes, then what are these?

    #52616 Reply
    John
    Guest

    If Tiar/Tias timer values are causing the RAB drops, then you must see equipments to see how to change those. It varies between the vendors.

    #52617 Reply
    John
    Guest

    I meant; …you must see equipments DOCUMENTATION

    #52618 Reply
    sanjeev
    Guest

    parameter name of rab drop causes

    #52619 Reply
    Mohib
    Guest

    Hello , Can you please check CE Utilization and congestion of the specific RAB failure cells and it is recommended to reduce the non real time services data rates. Thanks

    #52620 Reply
    Mohib
    Guest

    Hello , Can you please check CE Utilization and congestion of the specific RAB failure cells and it is recommended to reduce the non real time services data rates. Thanks

Viewing 10 posts - 1 through 10 (of 10 total)
Reply To: RAB Drop Problem
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