FIELD: information technology.
SUBSTANCE: network node receives from a requesting node a request to monitor a group which contains a plurality of group members. The request also includes at least one criterion to be monitored. The network node determines which group members fulfill the criterion, and sends to the requesting node a notification message including the identity of at least one group member fulfilling the criterion. The notification message also includes additional criterion fulfillment information, the additional criterion information including the identity of the criterion fulfilled.
EFFECT: high efficiency of group management in a communication network.
12 cl, 3 dwg
