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SDCCH DROPS

Viewing 15 posts - 76 through 90 (of 99 total)
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  • #35785 Reply
    SHELDON
    Guest

    I think SDCCH drops in A interface are included in the calculation of SDR. They’ll fall under drops due to ‘OTHER’

    #35786 Reply
    Mucky
    Guest

    Hello Patrick,

    if you using ericcson bts,and
    you want to reduce SDCCH Drop, trying to push SDCCH allocation to Channel Group 0. check the BSC properties for maximum SDCCH allocation per TRX and after that you can reduce paging load with adjusting MFRMS value.

    #35787 Reply
    Mak
    Guest

    SDCCH Drop on A interface is not calculated in the SD drop formula. But when you see the ND report, you will found the counter of Sd drop on A interface.

    #35788 Reply
    Paul C S
    Guest

    Dear Patrick,

    What we have to know is the difference between fail & drops.

    SDCCH Fail ==> it simply means that channel SDCCH hasn’t seized the TImeslot in TRX. It’s sometimes due to SDCCH Congestion, TRE Faulty which carries SDCCH TS or even bad SDCCH TS in TRE.

    SDCCH Drop ==> it means that SDCCH channel has seized SDCCH TS in current TRX, but due to bad radio condition (Qual, Interference), then this channel drops. It’s also due to BAD SDCCH TS.

    I suggest you to re-allocate SDCCH TImesot to another TS. Remember to pur the SDCCH TS not in TS0.

    Cheers,

    Paul C S

    #35789 Reply
    ikbel
    Guest

    hello, which are the KPIs that influence the SDCCH drop? how can I reduce the Sd drop?

    #35790 Reply
    Paul C S
    Guest

    Dear Ikbel,

    Parameters which influenced SD drops : SDCCH Drop HO + SDCCH Drop radio + SDCCH Drop BSS

    How to reduce SD Drops : you have to find out whether it is from radio, HO or BSS.

    For radio, you should try to check first the TRE which has SDCCH Channel (ussually TRX 1). Then try to change SDC allocation to another TS.

    What equipment do you handle? ALcatel, Ericsson?

    Unfortunately, in Alcatel, I haven’t found an indicator that shows us the most SD Drops TRX contributor.

    Also please check the Interference Level, either in UL or DL.

    Best regards,

    Paul C s

    #35791 Reply
    AK
    Guest

    the range RX level is -47db to -110db, my doubt is why it is has got a negative figure?

    #35792 Reply
    Brother
    Guest

    Ak

    Actually it is not db it is dBm

    The difference between dB and dBm is;

    dB is relative to a specified unit, and also dimensionless because values are divided (watt to watt for example)

    dBm is absolute value and “m” is for “microwatt”

    there are more decibel units, for antennas dBi is used and here i is for “isotropic”, gain of antenna is defined relative to isotropic antenna.

    so minus corresponds a watt value actually you can calculate it or convert and find corresponding value.
    decibel is used because using “watt” makes things complicated so many digits so decibel makes things simple

    #35793 Reply
    viju
    Guest

    which core parameters i have to check in NOKIA system to improve HOSR
    ?

    #35794 Reply
    Chairil
    Guest

    How about siemens equipment?

    #35795 Reply
    prashanth
    Guest

    what is tch and what for it is used

    #35796 Reply
    varun sharma
    Guest

    Hi Prashant,

    “tch” is traffic channel and it uses for carry the user information either voice or data.

    #35797 Reply
    SANJAY
    Guest

    How to corelate SDCCH & TCH with BTS installation quality.

    #35798 Reply
    Orstine
    Guest

    Hello Brother, can you give me a formula that relates dB and dBm. I also like a detail explanation of the difference between the two units. Pls throw more light on the negative sign that always preceeds dBm. Thank you

    #35799 Reply
    Pix
    Guest

    Orstine,

    can you please search in other topics (use the search feature), it was already exlained many times.

    cheers
    pix

Viewing 15 posts - 76 through 90 (of 99 total)
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