Method, device and computer program for selecting a router node in an lln network

A method for selecting a router node in a LLN (Low power and Lossy Networks)-type telecommunication network including a plurality of nodes likely to act as data packet routers from or to at least one host node belonging to a group of multicast nodes likely to transmit and/or receive data packets through the network, and a root node including a first table for storing associations between at least one router node and at least one host node, the method comprising:

• upon receipt by a router node of a multicast data packet from a host node or an adherence request to a multicast group from a host node, the router node transmits to the root node a MER_Request (Multicast Edge Router Request) request of configuration as a multicast router node to serve the host node;
• and,
• upon receipt of the MER_Request request, the root node determines, from the first association table a configuration of the router node;
• and,
• transmits to the router node a MER_Reply reply message including the determined configuration, the configuration of the router node including assigning to the router node one of the following statuses:
• MER (Multicast Edge Router):
• indicating that the router node is configured as a single multicast router for the host node,
• NON_MER:
• indicating that the router node is not configured as a multicast router for the host node.

A device for selecting a router node in a LLN (Low power and Lossy Networks)-type telecommunication network comprising:

• a plurality of router nodes likely to act as data packet routers from or to at least one host node belonging to a multicast group likely to transmit and/or receive data packets through the network;
• a root node including a first association table for storing associations between at least one router node and at least one host node of the multicast group;
• wherein:
• each router node is configured to transmit to the root node a MER_Request (Multicast Edge Router Request) request of configuration as a router node;
• and
• the root node is configured to determine from the first association table a configuration of the router node, and transmit to the router node a MER_Reply reply message including the determined configuration, the configuration of the router node including assigning to the router node one of the following statuses:
• MER (Multicast Edge Router):
• indicating that the router node is configured as a single multicast router for the host node,
• NON_MER:
• indicating that the router node is not configured as a multicast router for the host node.