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Viewing 15 posts - 16 through 30 (of 31 total)
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  • #46133 Reply

    Hi Pix,

    Drop are due to unsuccessful Intracell handovers due to loss of connection (MS). I even increased Radio Link Timeout from 9-15 but i dont see any improvement. Is there anything you can suggest me? Do u need any other info.


    #46134 Reply

    well.. you really need to see on which TRX is the issue, because right now looking globally at the cell doesn’t seem to be enough.

    did you clear out all the possible interferences ?

    did you check your intracell HO settings ? what are the triggers ?

    Loss of connection might be due to TRX failures. The failure is sudden, leading to the expiry of the radio link counter whichever its value…

    #46135 Reply

    Who can tell me what is the main problem for poor sound? and high drop BSS?

    #46136 Reply


    that would be bad level and or bad qual, or good level and bad qual. Perform drive test or spectrum measurement

    #46137 Reply

    In the baseband hopping the call is carried by all the TRXs of the sector. They togather will hold the call one after one in a systematical way and constabt order. It is a big mistake to say the most traffic is carried by the last TRX !! did you forgit the hopping ?

    #46138 Reply

    hi Dara

    I am suggesting three ways here
    1) chk the uplink volume and downlink shd be 4DB.

    2)then also check the TRAUs in the Aif card
    3)and check the companding law algoritham which u are using(mu law or Alaw).we shd use same algoritham in the entire network


    #46139 Reply


    It depends how the hopping is implemented. In Alcatel, the hopping (sfh or bbh) is “synthetized”, meaning that the call is on one TRX, but the frequencies are hopping.

    #46140 Reply

    It means if their is a problem or interferance in a specific time slot, then call will be drop everytime & intracell handover is not possible?? Resulting will increase the Drop rates..

    #46141 Reply

    Yes. It also means that a call a on TRX which is faulty will not be “saved” by hopping.

    It is actually good, because the optimizers can detect a faulty TRX quickly, even with hopping !

    Increase in call drop rate, but fast reactivity from optim team… that’s a trade-off.
    The other solution (hopping on TS) will decrease call drops, but it will degrade the voice quality, and make the detection of the HW problem much slower. Altogether, subscribers are less happy with the second choice (bad quality for one year is worse than high call drop for 2 days)

    #46142 Reply

    Hi Pix,
    You said that TRX is faulty in that case, but i had also heard that some times a Time slot is faulty & some times it enters in to Not used state. But time slot is just a span of time,difined for a user to make a call in a particular time.So how it will be faulty?????

    #46143 Reply

    timeslot are rarely not-useable… Actually, let’s say that i’ve never seen that myself. Usually, it is the whole TRX that is faulty.

    But i guess the case can happen.

    How can it happen ? Well, maybe some misconf between Abis and Air interfaces, or some software failures in the cell..?

    #46144 Reply

    Hi Sammi.

    First you must realize that if the cell is omni,and has 4 trx
    surely it is at full capacity.
    when you block 1 trx its reduced capacity to the cell,in this case these are not dropped calls because the calls do not establish a connection and send you to voicemail,for lack of resources.

    #46145 Reply

    Sammi, is the extended cell Nokia or something else. Implementation of extended cell as far as I know is different for Ericsson and Nokia. Nokia requires to have at least 2 TRX, one Normal TRX for distances 35km. For Ericsson you need only one TRX, but can only support 4 users.

    Nokia scenario – If you block the E-TRX and have only one E-TRX, you lose your target TRX for intracell HO when TA upper threshold is triggered.

    Ericsson – blocking a non BCCH TRX should not affect intracell HO, since coverage is not affected. Only capacity.

    Your site might be configured as 3 N-TRX and one E-TRX, if this is the case, if you want to service the E-TRX, reconfig it for 2N-TRX 1E-TRX.

    #46146 Reply

    I had seen these cases. when you create a new site, sometimes timeslotes enter in to the not used state. You have to just create these time slots again.

    #46147 Reply

    Dear Pix

    U hav written in one of ur answers that..
    “The last trx of the cell is usually the one that carries the highest amount of traffic.” Can u
    pls clearify that what is the reason for that????


Viewing 15 posts - 16 through 30 (of 31 total)
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