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COMMUNICATION SYSTEM AND COMPUTER PROGRAM PRODUCT

  • US 20110158231A1
  • Filed: 12/21/2010
  • Published: 06/30/2011
  • Est. Priority Date: 12/28/2009
  • Status: Active Grant
First Claim
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1. A communication system comprising:

  • a first communication terminal that is connectable to a network;

    a second communication terminal that is connectable to the network and that has not established communication with the first communication terminal; and

    a third communication terminal that is connectable to the network and that has established communication with the first communication terminal;

    whereinthe second communication terminal comprises;

    a first transmitting device that transmits to the first communication terminal a request packet that requests establishment of communication;

    a first receiving device that, after the first transmitting device has transmitted the request packet, receives from the first communication terminal a permission packet that permits establishment of communication;

    a first communication device that, in a case where the first receiving device has received the permission packet from the first communication terminal, establishes communication with the first communication terminal and performs communication with the first communication terminal;

    a second receiving device that receives the request packet from the third communication terminal, after the first receiving device has received the permission packet from the first communication terminal;

    a second transmitting device that transmits the permission packet to the third communication terminal in a case where the second receiving device has received the request packet from the third communication terminal; and

    a second communication device that, after the second transmitting device has transmitted the permission packet to the third communication terminal, establishes communication with the third communication terminal and performs communication with the third communication terminal;

    the first communication terminal comprises;

    a third receiving device that receives the request packet from the second communication terminal;

    a third transmitting device that transmits the permission packet to the second communication terminal in a case where the third receiving device has received the request packet from the second communication terminal;

    a third communication device that, after the third transmitting device has transmitted the permission packet to the second communication terminal, establishes communication with the second communication terminal and performs communication with the second communication terminal; and

    a fourth transmitting device that, in a case where the third transmitting device has transmitted the permission packet to the second communication terminal, transmits to the third communication terminal a notification packet that notifies that establishment of communication with the second communication terminal is permitted; and

    the third communication terminal comprises;

    a fourth receiving device that receives the notification packet transmitted from the first communication terminal;

    a fifth transmitting device that transmits the request packet to the second communication terminal in a case where the fourth receiving device has received the notification packet from the first communication terminal;

    a fifth receiving device that receives the permission packet from the second communication terminal, after the fifth transmitting device has transmitted the request packet to the second communication terminal; and

    a fourth communication device that, in a case where the fifth receiving device has received the permission packet from the second communication terminal, establishes communication with the second communication terminal and performs communication with the second communication terminal.

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