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BCCH missing

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  • #45241 Reply
    anshuman
    Guest

    -> The broadcast control channel (BCCH) is a point to multipoint, unidirectional (downlink) channel used in the Um Interface of a GSM cellular standard.

    -> The BCCH carries a repeating pattern of system information messages that describe the system related Information (CGI Info, Neighbouring cell Info- arfcn, Power level info etc.).

    I know only this much, is there any other functions?
    If it is not a right place to ask any begginer-level-querries, may be very small for you guys, then please let me know and I’ll stop.

    #45242 Reply
    asje
    Guest

    Broadcast Control Channel (BCCH)
    The Broadcast Control Channel is transmitted by the BTS at all times. The RF carrier
    used to transmit the BCCH is referred to as the BCCH carrier. The information carried
    on the BCCH is monitored by the MS periodically (at least every 30 secs), when it is
    switched on and not in a call.
    Broadcast Control Channel (BCCH) – Carries the following information (this is only a
    partial list):
     Location Area Identity (LAI).
     List of neighbouring cells which should be monitored by the MS.
     List of frequencies used in the cell.
     Cell identity.
     Power control indicator.
     DTX permitted.
     Access control (for example, emergency calls, call barring).
     CBCH description.
    The BCCH is transmitted at constant power at all times, and its signal strength is
    measured by all MS which may seek to use it. “Dummy” bursts are transmitted to ensure
    continuity when there is no BCCH carrier traffic.

    #45243 Reply
    ajay rajput
    Guest

    dear pix
    please tel me how to calculate max traffic beare by per trx or per chennal of trx

    #45244 Reply
    gaurav
    Guest

    what are the uses of different frequencies in bcch whose bandwidth is 200khz. what are its uses when we go for drive test

    #45245 Reply
    ASIF KHAN
    Guest

    hello everybody, i am working on my final year project of BS and i want to know ARFCN through AT commands. i am using siemens mobile phone A60. the commands i have tried to get ARFCN are
    AT^SMONC
    AT^MONI
    AT^MONP
    but i am getting ERROR. can anybody please help me, as its urgent.
    thank you.

    #45246 Reply
    TELECOM ENGINEER
    Guest

    After reading yur all deta i ca,nt understand about BCCH missing. how can we solve this problam by a easy method ?

    #45247 Reply
    vijay
    Guest

    broad cast control channel

    for 200khz it uses 1-12 channels,these channels are used for different frequency planning in a cell site

    proper planning is used to avoid interference

    in drivetest it is used for checking signal quality level i think so

    #45248 Reply
    Ayat
    Guest

    Hello

    in our network , we have counter with name Cell down .. it represents “””This counter counts how long the cell is interrupted on BCCH.
    When the confirmation message (tGetCellDownTimeAck.wResult)
    of cell’s interruption duration obtained from database is true, the
    counter records the measurement value”” as i know we define BCCH in trx0 , so when we lost the BCCH , the cell will be completely stopped .. but when check from the PM system ia have found large #f cell have this counter =3600 sec in BH and they have high traffic ..could you help me

    #45249 Reply
    pix
    Guest

    Ayat,

    This counter indicates whether the cell is available for traffic or not. It is as simple as that. You may have other counters which provide availability per TRX (trx avaiability).
    If trx3 is down, the rest of the cell remains available.
    If cell is not available, then trx0 is not transmitting bcch, then your counter is stepped.

    Now, based on the values you are seeing, it looks like the value “3600” indicates that the cell is indeed available.
    You should check the values for a cell which is apparently “down” or “locked”, and see if they increase or decrease.

    I suspect they decrease..? You gotta try… If all your cells are “Up”, consider locking a cell artificially for 30mn 😉

    Regards
    pix

    #45250 Reply
    Ayat
    Guest

    Hi again pix

    yes i understood what yoy had explained but i can not find that in PM data .. 3600 that means the cell is out during whole hour. check the data below and help me to explain ..

    BTS NAME Cell down time Cell Down Time (%) Number of invalid access requests TCH total traffic number (erl) SDCCH total traffic number (erl) TRX Equipment Availability Rate Number of TRXs Number of healthy TRXs
    Site001-3 3,600.00 100.00% 0 0 0 0.000 1 0
    Site8-3 3,600.00 100.00% 0 0 0 0.000 2 0
    Site8-1 3,600.00 100.00% 0 0 0 0.000 2 0
    Site9-2 3,600.00 100.00% 0 0 0 0.000 2 0
    Site9-1 3,600.00 100.00% 0 0 0 0.000 2 0
    Site10D-1 3,600.00 100.00% 0 19.5619 1.2542 100.000 8 8
    Site11-3 3,600.00 100.00% 0 44.2714 11.4383 100.000 4 4
    Site12-3 3,600.00 100.00% 0 20.4394 3.5419 100.000 4 4
    Site13-2 3,234.00 89.83% 0 0.3147 0.0606 0.000 4 0
    Site13-1 3,234.00 89.83% 0 0.0383 0.0972 0.000 4 0
    Site14-3 2,808.00 78.00% 0 0.7689 0.2628 0.000 4 0
    Site14-2 2,808.00 78.00% 0 0.6839 0.1689 0.000 4 0
    Site15-2 2,676.00 74.33% 0 0.1908 0.1503 0.000 4 0
    Site16-3 2,509.00 69.69% 0 7.0811 1.0378 25.000 4 1
    Site17-1 1,917.00 53.25% 0 1.7358 0.1736 50.000 4 2
    Site17-2 1,916.00 53.22% 0 0.4414 0.1453 50.000 4 2
    Site17-3 1,913.00 53.14% 0 0.5025 0.1469 50.000 5 2.5
    Site18-3 1,913.00 53.14% 0 3.9008 0.8436 50.000 4 2
    Site18-2 1,912.00 53.11% 0 7.2083 1.255 50.000 4 2

    #45251 Reply
    Ayat
    Guest

    Hi,,,

    I have found 2 cases
    case#1 High cell down time % with High Trx avalibilty and High traffic … no alram

    Case#2 zero TCH traffic and zero Trx avalibilty and high cell down time % in case with arlarm cell interuption

    cell down time =3600 in an hour that means that cell is out of service full hour.

    #45252 Reply
    pix
    Guest

    hi ayat,

    ok, i understood :

    Site10D-1
    Site11-3
    Site12-3

    are the crazy ones.

    I have no explanation for that , it looks like a counter issue.

    #45253 Reply
    Ayat
    Guest

    Hi

    thanks Pix as usual no helping for our vendor to confirm that ..

    but i have more question ..

    I have checked some cells with cell interruption alarm , these cells have problem with trx that contains BCCH channel for long time .. i am thinking , can we reconfigure channels to transfer BCCH to onther trx.??

    #45254 Reply
    pix
    Guest

    yes, that should be possible, but it would be strange if that was the issue.

    typically, you just lock the TRX that is carrying the BCCH. That should automatically (?) push the BCCH onto another TRX. I can’t be sure on your system though, but it’s easy to try.

    It’s a pity your vendor is not more interested in your issues. Can’t you “short-circuit” your primary local support and contact higher up support team ?

    Regards
    Pix

    #45255 Reply
    Ayat
    Guest

    Hi pix thanks

    They are zte ,, and I have to push them to check that .. At least as reminder boz currently we are in Ms period , thanks god it is almost finish

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