Patent ID: 7499466

Claim:
A method for performing multicast data delivery within a mobile telecommunication network having multicast groups, said network including routers that receive multicast data and forward said data to users, wherein the multicast data delivery of a multicast group is performed by means of a multicast delivery tree with a serving router as a root and with the users as leafs of said tree, wherein within the mobile telecommunication network a management of the multicast groups is performed according to the following steps: a joining message with a request for joining a user to a multicast group is sent to the serving router; the requested serving router checks at the receipt of the joining message, whether said serving router supports the multicast group; in case of supporting the multicast group the requested serving router performs the joining of the user to the multicast group; otherwise the requested serving router queries other routers to determine a supporting router for the multicast group in order to join the user to the requested multicast group; and, a procedure is started for joining the user to the multicast group by attaching the user to the multicast delivery tree having the supporting router as a root of the tree.