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CALL DROP RATE

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  • 15th July 2007 at 08:31 #48177
    JP
    Guest

    I have a question: “why the network call drop rate is:
    sum(drop)/sum(call) and not average(drop/call)”
    For example:
    yestarday: drop=10, call=100
    today: drop=12, call=98

    sum(drop)/summ(call)= 11.6%
    average(drop/call)=11.7%

    I need this information because I must evaluete the median of the DCR and I don’t know if median(drop/call) is correct.

    Thanks.

    15th July 2007 at 18:11 #48178
    pix
    Guest

    make the same example with a cell with 10 drops and 1000 calls (1%) one day, and 2 drops and 3 calls the next day…

    the average doesn’t show the truth at all. The sum is clearly giving you a correct value, that you can work on.

    by doing the sum first, you take into account the number of calls, which give a weight based on the traffic.

    23rd July 2007 at 05:45 #48179
    Lvin
    Guest

    hi
    Who can help me
    how we solve this type of call end?
    during drive test suddenly call end will happen .
    The state from TEMS investigation in signalling as below:
    call end:NW initiated release
    message type:45
    message dump(hex): 03 2D

    23rd July 2007 at 07:58 #48180
    Pix
    Guest

    Otherwise you have to check the NSS side, since it is not a radio problem… When checking the QoS Stats, do you see a lot of call drops caused by “NW” ?

    Regards,

    23rd July 2007 at 08:00 #48181
    Pix
    Guest

    That’s the start of previous message :

    Hi Lvin,

    It is possible your call is normally ended by the other side. Who/What do you call during your DT ?

    12th August 2007 at 16:58 #48182
    nachi
    Guest

    Hi
    Iam having call drops on a cell whose sole reason is T200 expiry and i have low Laction Updates success. The reason for its low value has been radio.This is a rural site.What is causing all this.Please help

    13th August 2007 at 04:09 #48183
    bhanu
    Guest

    Hi Lvin
    I think u should check the test number which u r calling during DT, I faced this problem once, at trhat time that no was not defined in our Switch.

    18th August 2007 at 12:24 #48184
    Naren
    Guest

    Hi ,
    If u are having call drop due to T200 expiry then this could be because of Media error…………so please check media ( SLIPs , ES, UAS).

    15th February 2011 at 10:29 #48185
    MRH70
    Guest

    I need help for to know what the causes of call drop rate T200, please help me!

    15th February 2011 at 10:53 #48186
    RAJA
    Guest

    MRH70,
    T200 expiry represnts Layer-2 Failure. SABM/UA message is not received by MS/BSS. This might be Due to low coverage (as its a remote site) check Rx_Lvel during call drop. Further it can also due to Hardware Failure. Check if particular TRX is faulty. Further, T200 works with N200 (maximum retransmission times of frame I) and its value is different for SD/TCH/FACCH (in ms).

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