Multicast in a point-to point oriented packet-switched telecommunication network
First Claim
1. 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 includes 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.
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Abstract
The invention relates to a method, network node, router, serving node and system for performing multicast in a point to point oriented telecommunication network. The basic idea is to introduce multicast transmission for parts of a network that is basically point-to-point oriented. This is done by creating transport multicast group tunnels between a router and a serving node in order to transport the multicast data. This invention describes the application of multicasting in point to point networks, such as UMTS with a scarce number of resources. In a mobile environment like in UMTS the idea could be implemented by using IP multicast for efficient transmission in the IP network between the SEGSN and GGSN for example on the Gn interface.
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Citations
21 Claims
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1. 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 includes 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.
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14. A router adapted to perform a multicast in at least one multicast group within a telecommunication network having at least one of said router and at least one serving node handling users 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, wherein
said router includes logic for establishment of a transport level multicast group tunnel towards the servings nodes 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, logic for assigning an identifier of a transport level multicast group, which corresponds to an identifier of a multicast group assigned in the further network in order to redirect the multicast transmission from the multicast-capable-application-transmission layer to the transport layer and, logic for transport of the multicast data on the transport multicast group tunnel to the at least one serving node.
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18. A serving node adapted to perform a multicast within a telecommunication network having at least one router and at least one said serving node handling users 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, wherein
said serving node includes logic for receiving multicast data sent from the router on a transport multicast group tunnel and, logic for administration of a relation between the transport level multicast group tunnel and the users registered to a corresponding multicast group and logic for serving the users registered to the corresponding multicast group with multicast data. replication of the received among the users.
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21. (Cancelled)
Specification