Patent ID: 11909716
Assignee: NOKIA SOLUTIONS AND NETWORKS OY
Field: Digital communication (Electrical engineering)
Classification: CPC H | IPC G  H

Claim 13:
14. A method for a system having a tree structure comprising a root node connected to a plurality of leaf nodes via a plurality of intermediate nodes, wherein:
each leaf node and each intermediate node has a corresponding parent node in the tree structure; and
the root node and each intermediate node has at least one corresponding child node in the tree structure, the method comprising:
a first leaf node communicating with a destination endpoint via a first access network, wherein the first leaf node stores a first mapping from a permanent virtual IP (VIP) address for the destination endpoint to a first physical IP (PIP) address for the destination endpoint on the first access network;
a second leaf node communicating with the destination endpoint via a second access network different from the first access network, wherein the second leaf node stores a second mapping from the VIP address for the destination endpoint to a second PIP address for the destination endpoint on the second access network, the second PIP address being different from the first PIP address;
the root node stores (i) a first root-node pointer pointing to a first intermediate node for the destination endpoint and the first access network and (ii) a second root-node pointer pointing to either the first intermediate node or a different intermediate node for the destination endpoint and the second access network; and
the first intermediate node stores at least a first intermediate-node pointer to a first child node for the destination endpoint and the first access network, wherein the first intermediate node uses at least the first intermediate-node pointer to forward, towards the destination endpoint, a connection setup request (CSR) for the destination endpoint received from a corresponding node.