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

Claim 9:
10. The system of claim 9, wherein the router is further configured to:
check whether the packet was received from below if the origin is not the preferred parent;
determine whether the multicast group address is listed in the routing table if the packet was received from below;
drop the packet if the packet was not received from below;
transmit the packet downward using the link layer unicast transmission, but not forwarding the packet to the child from which the packet was received, if the multicast group address is listed in the routing table;
determine whether the mote is a root of the RPL network;
if the mote is the root of the RPL network, determine 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, transmit the packet upward to the preferred parent.