To reduce packet loss of multicast data accompanying transfer of a client device by suppressing increase of a communication cost.
A data repeater 30 informs a multicast path management device 20 of a fact that there is a subscription request when the subscription request in a multicast group from the client device 50 is received. The multicast path management device 20 generates a list of base station devices 40 which are subordinates of the data repeater 30, generates a list of adjacent base station devices 40 adjacent to the respective base station devices 40 of the list and creates a list of adjacent data repeaters 30 having the adjacent base stations 40 in their subordinates. The multicast path management device 20 instruct the respective adjacent data repeaters 30 to construct a multicast tree beforehand and delay time until construction of the multicast tree accompanying the transfer of the client device 50 is suppressed by a fact that the multicast tree is constructed beforehand as instructed.
COPYRIGHT: (C)2005,JPO&NCIPI
Suzuki Weigen
Takashi Harajita
Kiyoko Tanaka
Norihiro Ishikawa
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Shiro Terasaki
Tomoya Kurokawa
Toyotaka Abe