Method, apparatus and system

An apparatus comprising:

• at least one processor and at least one memory including a computer program code, the at least one memory and the computer program code configured to, with the at least one processor, cause the apparatus at least to:
• determine, at a first neighbour node of a spectrum sharing group of nodes, initial cost information for sharing spectrum with an acting node in said group in dependence on node parameters associated with the first neighbour node;
• cause said initial cost information to be sent the acting node;
• determine final cost information in dependence on received cost information associated with at least one second node neighbour of said group, said received cost information determined in dependence on parameters associated with the least one second neighbour node;
• and
• cause said final cost information to be sent to the acting node.

An apparatus comprising:

• at least one processor and at least one memory including a computer program code, the at least one memory and the computer program code configured to, with the at least one processor, cause the apparatus at least to:
• receive at a first node, cost information associated with each of a plurality of nodes of a spectrum sharing group of nodes, said cost information determined in dependence on associated node parameters and cost information for transmitting using spectrum associated with each node of the spectrum sharing group of nodes;
• and
• determine a node for spectrum sharing from the spectrum sharing group, in dependence on said cost information.