| 摘要 |
Disclosed is a technique which reduces or omits the time needed for DAD processing solicited when a mobile communication device establishes a connection with a new subnetwork, thereby reducing the packet loss and delay to improve the communication efficiency. According to this technique, in a network in which a plurality of ARs 11 to 14 exist, when a mobile communication device (MN 10 ) establishes a connection with one of these plurality of ARs, in addition to the implementation of the DAD processing for confirming whether or not the address (CoA) of the MN is usable at the connection-accepting side, a wide-range DAD implementation request message including the interface ID of the MN is transmitted from the connection-accepting side AR to the other AR existing in a network of a given range (wide-range DAD effective area 31 ), and in a subnetwork under each of ARs, the DAD processing is conducted so as to confirm whether or not the address at the connection of the MN is usable. This enables the DAD processing to be omitted when the MN moves to the other subnetwork.
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