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Group communication system based on presence information and client device

  • US 20050216565A1
  • Filed: 03/24/2005
  • Published: 09/29/2005
  • Est. Priority Date: 03/25/2004
  • Status: Active Grant
First Claim
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1. A group communication system based on presence information for use in an instant message and presence service system that sends and receives presence information and an instant message among a plurality of client devices each comprising a presentity that provides presence information;

  • a watcher that observes presence information on presentities other than said presentity; and

    an IM (Instant Message) transmission/reception unit that sends and receives an instant message, wherein at least one client device of said plurality of client devices comprises;

    a group management unit that, when presence information provided by the presentity of said one client device changes to a specific status, generates a group agent device corresponding to the status; and

    a presence issuing unit that issues the specific status and an identifier used to contact said generated group agent device; and

    wherein said group agent device comprises;

    a member management unit that manages, as members thereof, said client device that generated said group agent device and a client device that sends an instant message to said group agent device; and

    an IM delivery unit that transfers an instant message, which is sent to said group agent device, to all client devices that are members managed by said member management unit except at least the sender of the instant message.

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