Relay device, wireless communication system and multicast relay method
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United States of America Patent
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Sep 20, 2011
Grant Date -
May 8, 2008
app pub date -
Oct 1, 2007
filing date -
Nov 7, 2006
priority date (Note) -
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Abstract
A relay device for multicast communications. The relay device transmitting a multicast user data packet containing a content to base stations. The relay device stores information indicative of a multicast group, information indicative of the base station and information indicative of a zone to which the base station belongs (these items of information forming a set by being associated with each other), and determines, when receiving a LEAVE packet via the base station, whether transmit a query packet about a leave target multicast group by comparing the information indicative of the base station associated with the leave target multicast group and with information indicative of a base station relaying the received LEAVE packet, transmits the user data packet containing the query packet to each of the base stations belonging to the zone on the basis of a result of the determination.
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