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SDCCH fro Multiband cell.

Viewing 13 posts - 1 through 13 (of 13 total)
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  • #45291 Reply
    Am
    Guest

    Hi,
    i am ericsson system. here i found that if sdcch is declared in 1800 (ol) then its takes no traffic.
    i dont no why?

    can anyone explian it?

    regards

    Am.

    #45292 Reply
    Pavel
    Guest

    Hi Am,

    I am also operating dual-band network(1800/900) and found that SDCCH usage at overlaid subcell is very low. Actually, SDCCH traffic exist, but very small.

    The only explanation, which I can imagine – is that 900 cell signal strength is much bigger, than 1800.
    Usualy, I have SDCCH/8(NCOMB BCCH MODE) at underlaid 1800 and SDCCH/8 at 900 overlaid cell.

    So usually – all SDCCH traffic comes first to 1800 cell, then to 900. If you have no overload of SDCCH traffic at 900 cell – you will not see traffic at 1800 as well.

    But SDCCH traffic at 1800 exist, if you have no IDLE SDCCH at 900 cell.

    #45293 Reply
    Vanderley
    Guest

    The SDCCH traffic is in that cell where you make the MSs to camp in idle mode. There are different strategies. For example Idle mode on 900 only (you play with cell bar qualify or C2 criteria) and as call starts (so its the SDCCH on 900) capture handover to 1800 (or whatever handover is called by the vendor). The result is no traffic on SDCCH on 1800.
    But if you have concentric dualband cell then you cannot have SDCCH on the inner zone (1800)

    #45294 Reply
    Vanderley
    Guest

    For concentric dualband I mean so called Common BCCH cell

    #45295 Reply
    Pavel
    Guest

    Hi Vanderley,

    I am also using Common BCCH at dualband cells for Ericssonm, but I haev SDCCH/8 at 1800 subcells and it handles small traffic.
    Can be?

    #45296 Reply
    Vanderley
    Guest

    Hi Pavel
    For Siemens and Alcatel it is for sure that you can’t define SDCCH on the band different from BCCH band.
    I asked ericsson guys and they told me that it is the same there. Maybe there is a bug and you are allowed to define such. I think this this should not be possible. Please check it again and let me know as I am very curious about this.

    #45297 Reply
    Pavel
    Guest

    Here is a pritout abotu cell logical channels, which I am recieving from BSC.
    As you can see – at 1800 I have SDCCH/8. Tighn now all of them are IDLE, but sometimes it is busy…

    #45298 Reply
    Pavel
    Guest

    CELL BCCH CBCH SDCCH NOOFTCH
    OD01205 1 1 15 21- 42

    CHGR BPC CHANNEL CHRATE SPV STATE ICMBAND CHBAND 64K
    0 6206 SDCCH-33597 IDLE 1 P900
    SDCCH-33596 IDLE 1 P900
    CBCH-42536 BUSY P900
    SDCCH-33595 IDLE 1 P900
    SDCCH-33594 IDLE 1 P900
    SDCCH-33593 IDLE 1 P900
    SDCCH-33592 IDLE 1 P900
    SDCCH-33591 IDLE 1 P900
    6191 TCH-8113 FR 1,2,3 BUSY 1 P900 NONE
    TCH-24387 HR 1,3 LOCK 1 P900
    TCH-24386 HR 1,3 LOCK 1 P900
    6194 TCH-8121 FR 1,2,3 IDLE 1 P900 NONE
    TCH-24403 HR 1,3 IDLE 1 P900
    TCH-24402 HR 1,3 IDLE 1 P900
    6198 TCH-8124 FR 1,2,3 IDLE 1 P900 EGPRS
    TCH-24409 HR 1,3 IDLE 1 P900
    TCH-24408 HR 1,3 IDLE 1 P900
    6202 TCH-8126 FR 1,2,3 IDLE 1 P900 EGPRS
    TCH-24413 HR 1,3 IDLE 1 P900
    TCH-24412 HR 1,3 IDLE 1 P900
    6203 TCH-8127 FR 1,2,3 IDLE 1 P900 EGPRS
    TCH-24415 HR 1,3 IDLE 1 P900
    TCH-24414 HR 1,3 IDLE 1 P900
    6205 TCH-8128 FR 1,2,3 IDLE 1 P900 EGPRS
    TCH-24417 HR 1,3 IDLE 1 P900
    TCH-24416 HR 1,3 IDLE 1 P900
    6208 BCCH-42908 BUSY P900

    CHGR BPC CHANNEL CHRATE SPV STATE ICMBAND CHBAND 64K
    1 6201 TCH-8125 FR 1,2,3 IDLE 1 1800 NONE
    TCH-24411 HR 1,3 IDLE 1 1800
    TCH-24410 HR 1,3 IDLE 1 1800
    6204 SDCCH-33590 IDLE 1 1800
    SDCCH-33589 IDLE 1 1800
    SDCCH-33588 IDLE 1 1800
    SDCCH-33587 IDLE 1 1800
    SDCCH-33586 IDLE 1 1800
    SDCCH-33585 IDLE 1 1800
    SDCCH-33584 IDLE 1 1800
    SDCCH-33583 IDLE 1 1800
    6180 TCH-8102 FR 1,2,3 IDLE 1 1800 NONE
    TCH-24365 HR 1,3 IDLE 1 1800
    TCH-24364 HR 1,3 IDLE 1 1800
    6181 TCH-8103 FR 1,2,3 BUSY 1 1800 NONE
    TCH-24367 HR 1,3 LOCK 1 1800

    #45299 Reply
    Pavel
    Guest

    Unfortunately, formating of text is brocken at this forum.
    The idea is – that I have idle SDCCH at 1800:
    SDCCH-33589 IDLE 1 1800
    SDCCH-33588 IDLE 1 1800
    SDCCH-33587 IDLE 1 1800
    SDCCH-33586 IDLE 1 1800
    SDCCH-33585 IDLE 1 1800
    SDCCH-33584 IDLE 1 1800
    SDCCH-33583 IDLE 1 1800

    and SDCCH(also BCCH, CBCH) at 900:

    0 6206 SDCCH-33597 IDLE 1 P900
    SDCCH-33596 IDLE 1 P900
    CBCH-42536 BUSY P900
    SDCCH-33595 IDLE 1 P900
    SDCCH-33594 IDLE 1 P900
    SDCCH-33593 IDLE 1 P900
    SDCCH-33592 IDLE 1 P900
    SDCCH-33591 IDLE 1 P900

    #45300 Reply
    Vanderley
    Guest

    Guys,
    Please comment this below.
    Is this possible with some other vendors?

    #45301 Reply
    Pavel
    Guest

    I’ve recieved ericsson answer, that it is possible.

    BSC R10 AXE

    #45302 Reply
    santosh kumar
    Guest

    hi
    will you please define SDCCH, what information does it contain, how it functions,is SACCH & SDCCH having equal blocks in Multiframes.

    #45303 Reply
    leandro
    Guest

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