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User busy during SMS reception

Viewing 11 posts - 1 through 11 (of 11 total)
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  • 3rd May 2010 at 12:49 #62470
    Ram
    Guest

    Hello,
    Will there be user busy case for a calling party if B-party is receiving SMS at that time. The called party has Call waiting active. Will the reception of SMS cause user busy condition. pls clarify.

    thanks,
    ram

    4th May 2010 at 07:47 #62471
    Mania
    Guest

    Yup there would be user busy when the called party is on SDCCH if he is on TCH during any transaction then call waiting would come into play.

    5th May 2010 at 18:11 #62472
    ram
    Guest

    Thanks Mania.

    11th May 2010 at 16:39 #62473
    naveen
    Guest

    I have NEVER heard of a scenario where the calling party is ‘marked busy’because he is getting an SMS. SMS is a low priority service and can be postponed for the sake of a CS call.

    13th May 2010 at 04:43 #62474
    Mania
    Guest

    But if you are already receiving an SMS and that the time a call is made or you are in the SD phase of call setup and during that time some one calls you its observed that he gets user busy.
    You can try it by having tems send SMS in a loop and try calling it. from another tems connected to same laptop. then have the events of both MS displayed on the same Event window.

    13th May 2010 at 10:14 #62475
    SHELDON
    Guest

    Naveen,

    An MS cannot monitor its paging channel if it is on a dedicated channel.

    If an MS is receiving an SMS ( which is sent on SDCCH, a dedicated channel), then it can’t monitor it’s paging channel, and at that instant, it will be marked as busy. I agree with Mania.

    Regards,
    SHELDON

    13th May 2010 at 12:26 #62476
    paraHO
    Guest

    Sheldon how does “MS cannot monitor its paging channel if it is on a dedicated channel.” with the GSM case below:

    Case D: Mobile terminating short message transfer, parallel call.

    BR

    14th May 2010 at 13:47 #62477
    SHELDON
    Guest

    ParaHO,

    Can you explain what happens in the case you mentioned (from whichever document you’re quoting from)?

    I stand to be corrected, but I still think ” an MS cannot monitor its paging channel if it is on a dedicated channel.”

    Regards,
    SHELDON

    14th May 2010 at 14:24 #62478
    paraHO
    Guest

    Sheldon, I sorry, forgot to mention:

    GSM04.11 Annex F or
    3GPP 24011 Annex F

    “LAPDm SAPI 3 handling for short message service”

    14th May 2010 at 15:53 #62479
    SHELDON
    Guest

    ParaHO,

    The description there does not contradict my point. Case D in that document describes how an SMS is delivered when the receiving MS is on a voice call. In this case, the SMS is sent on the SACCH, as described in the document. This even shows that SMS is not a “low priority service and can be postponed for the sake of a CS call”

    Regards,
    SHELDON

    15th May 2010 at 07:01 #62480
    paraHO
    Guest

    Yes Sheldon you right. Case D doesn’t contradict. I should have re-read the original question instead of thinking about the later answers.

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