Patent ID: 8780920

Claim:
A method for setting up a bidirectional data transmission path in a wireless meshed packet-switched communication network having a plurality of network nodes, one of which serves as a root network node, the method comprising: setting up a logical topology in the form of at least one routing tree proactively by the root network node of the routing tree sending routing request messages at periodic time intervals to other network nodes of the communication network, the routing request messages specifying first unidirectional data transmission paths to the root network node, setting up a first flag of a particular network node of the plurality of network nodes, the first flag having two selectable states for controlling a sending of a routing reply message by the particular network node, controlling, by the particular network node, setting of the first flag between: a selectable first state in which the particular network node sends a routing reply message to the root network node in response to the particular network node receiving one of the routing request messages, the routing reply message specifying a second unidirectional data transmission path to the particular network node, as a result of which a bidirectional data transmission path is set up between the root network node and the particular network node, and a selectable second state in which the particular network node sends no routing reply message in response to the particular network node receiving one of the routing request messages, wherein the setting of the first flag is automatically controlled by the particular network node based on predefined rules.