Patent ID: 7813309

Claim:
A radio multi-hop network in which a plurality of nodes comprising a multicast sender node and a multicast receiver node exchange information each other by radio to form a multi-hop network, wherein each of the nodes comprises: a unicast route control information acquirer that acquires unicast route control information, which is information of the plurality of nodes, from the multicast information received from other nodes and unicast route control messages denoting the connection information among nodes; a relay node set calculator that calculates a sender relay node set that covers all multicast sender nodes and a receiver relay node set that covers all multicast receiver nodes with use of the unicast route control information; a multicast route calculator that calculates multicast routes between nodes included in the calculated sender relay node set and nodes included in the calculated receiver relay node set; and a route register that sets the calculated multicast routes in a multicast forwarding table.