Patent ID: 11895674
Assignee: SAFRAN PASSENGER INNOVATIONS, LLC
Field: Digital communication (Electrical engineering)
Classification: CPC H  Y | IPC H

Claim 2:
3. The program of claim 2, the operations further comprising:
if the origin is not the preferred parent, the router checking whether the packet was received from below;
if the router determines the packet was received from below, the router determining whether the multicast group address is listed in the routing table;
if the router determines the packet was not received from below, dropping the packet;
if the multicast group address is listed in the routing table, the router forwarding the packet downward using a link layer unicast transmission, but not forwarding the packet to the child from which the packet was received;
determining using the router whether the mote is a root of the network topology;
if the mote is the root of the RPL network, determining whether the mote is a member of a multicast group of the packet; and
if the mote is not the root of the RPL network, forwarding the packet upward to the preferred parent.