Patent ID: 7369541

Claim:
A method for performing multicast transmission of multicast data in at least one multicast group within a telecommunication network having at least one router and at least one serving node handling at least one user and providing a protocol stack having a multicast-capable-application-transmission layer used for performing said multicast transmission of multicast data in at least one multicast group wherein said multicast-capable-application-transmission layer is located above a point-to-point-layer said method comprising the following steps a request message of the user for registration to a multicast group is received by the router and, if the user is the first one registering to the multicast group a transport level multicast group tunnel is established between the router and the serving node by means of transport layer protocol for tunnelling on the transport layer, located below the point-to-point layer, providing a point-to-multipoint connection and said tunnel is assigned to the multicast group redirecting the multicast transmission from the multicast-capable-application-transmission layer to the transport layer, otherwise the relation between transport level multicast group tunnel and the multicast group is determined and, transmission of the multicast data is routed over the transport level multicast group tunnel from the router to the serving node and, transmission of the multicast data from the serving node to the user registered to the corresponding multicast group is performed.