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Preparation Failures in Alcatel BSS

Viewing 6 posts - 1 through 6 (of 6 total)
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  • #47056 Reply

    Dear All,

    what is preparation failure rate, and what are the reasons for this failures..please comment with respect to Alcatel BSS.


    #47057 Reply

    Hello Ali,

    Preparation failure, during the TCH assignment ? The only experience I have about this failure was linked to a missing patch on the NSS side. It impacted heavily all cells of the network, as soon as they were congested. I think it was due to a wrong management of the Directed Retry or the Queuing.

    If it only happens a little bit to few cells, I can’t say. I think nobody knows exactly why there are these failures 🙂

    #47058 Reply

    yes it appears on almost all cells of the BSC its msc is Huvawie NGN, can u also explain wat really wat happens when these Preparation failure occurs.

    #47059 Reply

    Hi Ali,

    This is a problem of compatibility betwenn Huawei software and Alcatel software. I recommend you escalate this problem quickly to your program manager, and ask for both vendors to perform tests and traces.

    The TCH assignment BSS preparation failures lead to a failure in TCH assignment, so people can’t make calls. Check out the formula of this indicator if you want more details…

    #47060 Reply

    Thanx Pix for your explaination, please also tell if u know sometihing about Remote TC drop alarms at Alcatel there is no alarm on any of the hardware of BTS nor any related BSC card.

    #47061 Reply

    Remote TC drop can be due to
    – Abis link failure
    – TRE or SUM card failure
    – BSC board failure
    – transcorder board failure

    and more…
    try to see which sites are getting a high drop due to RTC. If only one cell, suspect a TRE problem. If 3 cells from one sector, suspect Abis failure (or SUM ?).
    If all cells in BSC, suspect BSC problem
    If all cells in transcoder, suspect transcoder issue.


Viewing 6 posts - 1 through 6 (of 6 total)
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