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Alcatel NbExtraAbisTS definition

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  • #50202 Reply
    Hamdi
    Guest

    Hi all;
    I’m a BSS engineer and i’m new here. I would like to ask how to define the optimal NbExtraAbisTS in our Alcatel network. which is the appropriate method and how using the sharing factor (dynamic abis feature in B9) to adjust this parameter.
    Thanks

    #50203 Reply
    Pix
    Guest

    I’m afraid you’ll need to perform a full design study in order to determine how many TS you can/need to use as “extra TS”.

    By default, you can put all remaining Abis TS for an Abis Link as “extra TS”.

    The more Extra TS you put, the more users on the BTS can experience higher throughputs.

    Regards,
    Pix

    #50204 Reply
    Flex
    Guest

    NbExtraAbisTS depends on the coding scheme used in a cell.

    #50205 Reply
    Hamdi
    Guest

    Thank you for your replies. as u say pix it is more suitable to have more “extra TS”, but i think these “extra TS” will need ressources on BSC’s (affecting BSC HW load) and therefore my purpose is to have the less number of “extra TS” offering the highest throughput and for this i would like to use the sharing factor as defined in B9.so how to proceed?

    #50206 Reply
    Pix
    Guest

    Hamdi,

    EXTRA TS do not require directly additional capacity in BSC or MFS. It is the amount of packet traffic that will require more GPU (in MFS)

    EXTRA TS impacts only the ABIS usage.

    But if by putting more EXTRA TS, it generates more GPRS traffic, then you’ll have to redesign GPU’s, Gb interfaces and Ater PS interfaces.

    — how to proceed ?
    As i said earlier, you need to perform a full study. I can’t explain it on a website !! It’s huge.

    #50207 Reply
    TNS
    Guest

    Hi, all.

    “… EXTRA TS do not require directly additional capacity in BSC…”
    In fact it’s true if we use BSC Evolution.
    If we use G2 BSC we need one TCUC per 2 EXTRA TS…
    So it’s BSC resource consuming…

    BR,
    TNS

    #50208 Reply
    Pix
    Guest

    Oh ? I wasn’t aware of that. I often read 1 TCUC = 4 FR TRX or 2 DR TRX, but never saw anything about ExtraTS. It’s very surprising.
    I’m sorry I must ask, but are you sure about that ?

    #50209 Reply
    Hamdi
    Guest

    it’s 100% sure as said TNS. So that’s the problem to determine the optimal “Extra TS” for a site using the sharing factor. i think that Alcatel recommends 4 “Extra TS” for a site of 3 sectors but i’m not sure about this. Anyone have more explanation about the calculation?

    #50210 Reply
    Pix
    Guest

    **** The rule is 1 TCUC for 8 extra TS ****

    2 ts only was a little low !!
    i’m happy we talked about his, because i totally forgot about it.

    #50211 Reply
    pix
    Guest

    hamdi,

    4 extra TS on a 4/4/4 BTS gives :
    4 x 4 = 16 extra nibbles
    3(1bc + 2sd) x 3 = 9 bonus nibbles
    => 25 “extra” nibbles available

    1 MS in MCS9 needs 18 nibbles. That’s 4 basic nibbles + 14 “extra” nibbles.

    So with 4 extra TS, you can have 1 MS in MCS9, or 2 MS with MCS7, etc…

    If you cinlude free basic nibbles from other radio timeslots, then you might reach 2 MS with MCS9, etc…

    #50212 Reply
    TNS
    Guest

    Hi, all.

    Pix said:
    “… **** The rule is 1 TCUC for 8 extra TS **** …”

    It’s Right. My mistake was induced by the fact that me and my colleagues consider 1 TCU = 4 TCUC.
    It’s NOT RIGHT. TCUC means a unit which is a part of the A-bis TSU.

    I’ll try to summarize:
    A9120 Evolium BSC ( G2 ) = up to 14 TSUs.
    1 TSU = 8 TCUs ( TCUCs ). Each TCUC should be configured as FR TCUC or DR TCUC.

    1 FR TCUC = 4 FR TRX or 8 Extra PS TS or mixture ( no DR TRX possibility )

    1 DR TCUC = 2 DR TRX ( only ).

    I think there is a limitation for the 1st TCUC of the 1st TSU of each BSC rack – it cannot be DR TCUC configured.

    So…

    Hamdi, when we put a new BTS in the cities and towns, if we have a free A-bis and TSU resources we put 8 to 10 Extra TSs per BTS.
    If it’s not possible we put as much as we can.
    Then if we need resourses ( new TRXs or FR to DR reconfigurations ) we cut of what we need. Adding a 3rd A-bis is in too rare cases.

    BR,
    TNS

    #50213 Reply
    pix
    Guest

    3 abis per BTS is not something possible in alcatel BTS… so far 🙂

    #50214 Reply
    Hamdi
    Guest

    Never heard about 3 abis links per BTS. MAX is 2 a primary and secondary Abis link in Alcatel.

    #50215 Reply
    TNS
    Guest

    Yes, it’s true.
    I mean 3rd for the site…
    For sites with 10 up to 24 TRXs we use 2 (MBI5/MBO2) or 3 (MBI3/MBO1) cabinets.
    Usually they are connected via 2 A-bis links , in rare cases via 3 A-bis.
    I’m sorry for the not very clear expression.

    BR,
    TNS

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