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Dual Talk

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  • #51679 Reply

    what’s the logical canal used for the paging of the mobile for the second Call.(FCCH, FACCH or PCH)

    #51680 Reply

    I don’t think there is paging, because the MS is in dedicated mode, the MSC already knows in which cell the MS is located. There is no need of a paging.
    But I don’t know exactly how is established a second call. That’d be interesting to know. I would say that the MSC will simply send an alerting message on the FACCH or SACCH… (?)

    #51681 Reply

    toofy are you talking about the user switching between two separate calls to talk or a conference call between the user and two callers?

    #51682 Reply

    it’s not a conf call, but a second call when the first call is already handled

    #51683 Reply

    toofy, ok there are still the points:

    – did MS dial both calls (outgoing)
    – did MS dial one call (outgoing) and other call is incoming
    – did MS receive both calls (incoming)

    I looked at Call Waiting (GSM0383) as MS needs notification that a call is there to know to answer it. Also Call Hold (GSM0383) would be relevant as you say no multiparty (conference call) in progress (GSM0384)

    As dual call appear to be supplementary services there is a trade of information between HLR and VLR. As one call is already in progress it would appear the second call would be route through same Mast as the one currently handling call. There appear no PCH required as HLR and VLR know where MS user located.

    What I have not found out yet is where additional assignment (GSM0408) is sent on FACCH or SACCH etc…

    #51684 Reply

    that’s my question paraHO:
    where additional assignment (GSM0408) is sent on FACCH or SACCH etc…

    #51685 Reply

    toofy I need to be sure I understand what you say first. I maybe slow thinking but I get there in the end 🙂

    I am looking for FACCH/SACCH etc and will reply as soon as possible. I think Pix know more than me, but i will try to find out..

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