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Optimizing TCH Drop 2% to 0.65%

  • This topic has 12 replies, 1 voice, and was last updated 11 years ago by Ers.
Viewing 13 posts - 1 through 13 (of 13 total)
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  • #59570 Reply
    Ers
    Guest

    Hi All,

    I need to discuss about engineering process needed to optimize TDR from 2% to 0.65%

    Is ‘2%’ of TDR showing very very bad network performance? Or maybe any of you have experience worse than it?

    Thanks in advance

    #59571 Reply
    hicham
    Guest

    It’s not so bad for cells with Hight TA but it’s should be under 1% for urbain cell(and less)

    #59572 Reply
    mesfer
    Guest

    Dear all
    what do u mean TDR
    thanks

    #59573 Reply
    Ers
    Guest

    TDR = TCH Drop Rate

    hicham ..is it TIming Advance you mean for TA?

    #59574 Reply
    Pix
    Guest

    Hi ERS,

    as said before, 2% could be OK if the cell has an extended & weak coverage (with poor rxlev in many areas)

    urban cells should be better than 1.2%.

    Very High TDR (>> 5%) could also be caused by poor hardware performances (abis links, board failures, etc).

    #59575 Reply
    Ers
    Guest

    Hi Pix,

    In condition as you mentioned (..the cell has an extended & weak coverage (with poor rxlev in many areas)), is it hard to optimize TDR value from 2% to 0.65% without new site deployment?

    #59576 Reply
    Pix
    Guest

    Ers,

    Absolutely. If you are certain that the frequencies are clean ( = no interference) and that the coverage area cannot be enhanced (with high power transmitters, or better antennas, or thicker feeders, or TMA, or remove some combiners, etc)

    Keep in mind that what you need is to increase the coverage.. There is no miracle :
    – increase current cell coverage (see above)
    – or, add a repeater
    – or, add a BTS

    Now, there is a trick. It’s not “good” IMO, but it will make your stats look better. By changing some parameters, you can actually forbid the user with poor RXLEV to establish a call.
    Less “low rxlev” calls = less call drops
    … but also = less traffic.

    the 2 parameters you can use are :
    RACH TA FILTER
    RXLEV ACCESS MIN

    But really, if anyone asks you who told you to do that, don’t mention me. The point of my job is to increase traffic, because traffic= revenues !

    Just say it’s an idea from..

    Nosfera-pix

    #59577 Reply
    Ers
    Guest

    Pix,

    If we do the tricky tweaky :)…would it possibly increase the SD blocking?

    Rgrds,

    Ers

    #59578 Reply
    Pix
    Guest

    The evil trick will actually decrease the traffic, SDCCH & TCH. Therefore, I don’t foresee an increase in SDCCH congestion.

    What you are going to do is *logically* reduce the “cell best serving area”.

    Yeeerk.

    🙂

    Pix

    #59579 Reply
    Ers
    Guest

    Pix,

    Just to make sure..

    the trick will not effect the stat param of SDSR (SD Success Rate)?

    #59580 Reply
    Pix
    Guest

    ERS,

    The only thing I can say is that it *should* not decrease QoS, except the TCH traffic and SDCCH traffic.
    Of course, there are always small chances that something unpredictable happens. But in your case, I can’t think of anything. So it is a pretty safe trick, as long as you don’t care about traffic.

    (sorry to emphasize so much on traffic…)

    Cheers,
    pix

    #59581 Reply
    hicham
    Guest

    Hi and sorry to answer late,
    to Reduce ur call drop in such condition (cell with important TA) u have to :

    – Check 1st ur HW (in such case most important cell are in rural area and their maintenance is so hard , pylone with more than 40 HBA) : Antenna , conbiner, TRXs ect…check alarms

    – check ur frequency (in general in this rural area , there is no problem)

    if u don’t have any problem from these 2 u have a planification problem u have to add a new site or repeter (u have to locate the source of ur trafic)

    Some astuces (not recommended becuase u reduce ur trafic):

    Reduce ur RX_LEV_ACCES
    Reduce the BS_POWER_MAX

    with these two parameters u are sure that u will have a good KPI but with a important reduction of trafic (be carefull :))))))))

    Good Luck

    #59582 Reply
    Ers
    Guest

    Pix & Hicham,

    Thanks a lot guys,much clear for me.

    Wish you both success..always 🙂

    Kindly Regards,

    ERS

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