Interference avoidance between overlapping wireless networks

A method comprising:

• acquiring, by a first access node of a first wireless network from a second access node of a second wireless network, mapping information mapping at least one node of the second wireless network with at least one node of the first wireless network, wherein the first access node of the first wireless network and the at least one node of the first wireless network are different nodes;
• determining, by the first access node on the basis of the mapping information, at least a first subset and a second subset from nodes of the first wireless network;
• acquiring, by the first access node, information on a channel reservation for the at least one node of the second wireless network;
• and
• preventing, by the first access node, transmission by at least one node of the first subset during the channel reservation while allowing transmission by at least one node of the second subset during the channel reservation.

An apparatus comprising:

• at least one processor;
• and
• at least one memory including a computer program code, wherein the at least one memory and the computer program code are configured, with the at least one processor, to cause the apparatus to:
• acquire, as originated from at least one node of a first wireless network, information on at least one interfering node of a second wireless network;
• generate mapping information between the at least one node of the first wireless network and said at least one interfering node;
• and
• cause transmission of the mapping information to an access node of the second wireless network, wherein the at least one interfering node and the access node of the second network are different nodes;
• and
• cause transmission of a channel reservation message reserving a channel for the at least one node of the first wireless network, wherein the mapping information is transmitted in connection with the channel reservation message.

An apparatus for operating as or within a first access node of a first wireless network, the apparatus comprising:

• at least one processor;
• and
• at least one memory including a computer program code, wherein the at least one memory and the computer program code are configured, with the at least one processor, to cause the apparatus to:
• acquire mapping information mapping at least one node of a first wireless network with at least one node of a second wireless network, wherein the mapping information is originated from an access node of the second wireless network, wherein the first access node of the first wireless network and the at least one node of the first wireless network are different nodes;
• determine, on the basis of the mapping information, at least a first subset and a second subset from nodes of the first wireless network;
• acquire information on a channel reservation for the at least one node of the second wireless network;
• and
• prevent transmission by at least one node of the first subset during the channel reservation while allowing transmission by at least one node of the second subset during the channel reservation.