PRESENCE AND MULTICAST/BROADCAST SERVICE

摘要

The invention provides a solution for introducing a group presentity unit representing a group of users being members of a multicast group. Further the present invention proposes to introduce interfaces between the multicast server, the group presentity unit and the presence network part to exchange information between the nodes in order to link the independent protocol layers, namely the multicast layer and the presence layer. The group presentity unit receives the information over the interfaces and uses it to update the group presence information. Further the collected information is used by the multicast server and/or the presence network part to improve the corresponding operations performed by the corresponding node.