| 摘要 |
A method, program and user node for use in a communication system implemented over a network comprising a plurality of user nodes, each being associated with a respective presence status indicating an availability of the user node for communication within the communication system. The method comprises, at each of a first one or more of the user nodes: transmitting repeated presence messages to each of a plurality of others of the user nodes, each of the presence messages comprising at least one of: a request for the presence status of the other user node, and a notification of the presence status of the first user node; determining a measure of resource usage in relation to at least one of the first user node and the other user nodes; and controlling a regularity of the repeated transmission of presence messages in dependence on the determined measure of resource usage measure.
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