Multicast packet receiving apparatus and multicast packet management device and multicast packet forwarding device

摘要

Technique to reduce the loss of the multicast packet and the delay time for the receiving communication device using a wireless communication performs handover, to realize the multicast technology in consideration of the mobility is disclosed, and performing wireless communication, according to the technique is (listeners) 16, in a state in which received via the PIM-SM router 14 and (rendezvous point) 13 RP multicast packet transmitted from the (source) 11 source communication device receiving communication device has, If the receiving communication device tries to handover, it sends to the PIM-SM routers 14 currently connected handover declaration message including identification information of the access point to be connected after the handover, PIM-SM router 14, the identification information Insert participation messages PIM-SM by obtaining the address of the PIM-SM router 15 of the handover destination based on, and transmits the RP. RP constructs a multicast route to the PIM-SM router 15.