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Relay device, wireless communication system and multicast relay method

  • US 20080107060A1
  • Filed: 10/01/2007
  • Published: 05/08/2008
  • Est. Priority Date: 11/07/2006
  • Status: Active Grant
First Claim
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1. A relay device transmitting a user data packet, containing a content to be distributed to a mobile terminal, in which to set information about a multicast group associated with the content, to a plurality of base stations managed in the way of being grouped into zones, the relay device comprising:

  • a storing unit storing information about a multicast group in which the mobile terminal participates, information about the base station performing wireless communications with the mobile terminal and information about the zone to which the base station belongs in a way that associates these items of information with each other;

    a extracting unit extracting, when receiving a LEAVE packet of a request for leaving the multicast group from the mobile terminal via any one of the plurality pf base stations, the information about the base station, which is stored in the way of being associated with the leave target multicast group and with the zone to which the via-base-station belongs, from the storing unit;

    a determining unit determining whether or not it is required to transmit a query packet for checking existence of the mobile terminal continuing the participation in the leave target multicast group by comparing the base station extracted by the extracting unit with the base station that relays the received LEAVE packet; and

    a transmitting unit transmitting the user data packet containing the query packet to each of the base stations belonging to the zone whose information is stored together with the information about the leave target multicast group in the storing unit on the basis of a result of the determination made by the determining unit.

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