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1. WO2003019861 - MULTI-DIFFUSION DANS DES RESEAUX POINT A POINT DE COMMUTATION PAR PAQUETS

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Claims

1. Method for performing multicast transmission for a
multicast group within a telecommunication network having a core network part with a router and at least one host handling users, wherein between the router and the host at least one intermediate node is located

characterised in that

a user registers to a multicast group for the multicast
transmission and,
- the router receives the registration and,
the host is informed about the user being served by the
host and registering to the multicast group and,
the multicast transmission between the router and the
host is performed by means of at least one transport
level multicast group tunnel, which is assigned to the
multicast group and which is established by means of a
transport layer protocol for tunnelling and,
the host uses radio bearer towards the user registered
to the multicast group to route the multicast data to
the at least one user.

2. Method according to claim 1 characterised in that the
transport level multicast group tunnel has a structure of a multicast delivery tree.

3. Method according to claim 1 or 2 characterised in that the multicast transmission is performed by means of one
transport level multicast group tunnel between the router and the host.

P15133-MAZ 7 August, 2002

4. Method according to claim 1 or 2 characterised in that the multicast transmission is performed by means of one
transport level multicast group tunnel between the
intermediate node and the host.

5. Method according to claim 1 or 2 characterised in that at least two transport level multicast group tunnels are
established between the router and the host involving at least one intermediate node.

6. Method according to claim 4 or 5 characterised in that the intermediate node relays information exchanged between the router and the host.

7. Method according to claim 4 or 5 characterised in that the intermediate node is to be the root of the transport level multicast group tunnel going from the intermediate node to the host.

8. Method according to claim 2 or one of the claims 4 to 7 characterised in that the multicast delivery tree is a source based multicast delivery tree to involve the
intermediate nodes into the multicast transmission.

. Method according to one of the claims 1 to 8 characterised in that in order to perform registration or de- registration of a user to or from a multicast group, the user informs the router directly or via the intermediate node, the router informs the intermediate nodes and/or the hosts to register or de-register to the transport level multicast group tunnel and an updating of the
corresponding entries in the data structure is performed.

P15133-MAZ 7 August, 2002

10. Method according to one of the claims 1 to 9
characterised in the multicast data packets are identified by means of a multicast-flow-identifier , which corresponds to an identifier of the transport level multicast group tunnel, or to an address of the multicast group to which the user is registering or to a GTP Tunnelling ID TEID.

11. Method according to one of the claims 1 to 10
characterised in that the router administrates a relation between multicast group and the multicast-flow-identifiers in the core network, the host administrates a relation between the multicast-flow-identifier and an identifier of the user or group of users.

12. Method according to claim 11 characterised in that the identifier of the user is the International Mobile
Subscriber Identifier IMSI or the identifier of the radio bearer.

13. Method according to claim 2 or one of the claims 4 to 11 characterised in that the intermediate nodes administrates the relation of the multicast-flow-identifier identifying the incoming multicast data from the router and the
multicast data outgoing towards the hosts involved in the multicast transmission

14. Method according to one of the claims 1 to 13
characterised in that the transport level multicast group tunnel is a dynamic transport level multicast group tunnel in case for a user being the first one registering to a multicast group the transport level multicast group tunnel is to be established.

15. Method according to one of the claims 1 to 13
characterised in that the transport level multicast group

P15133-MAZ 7 August, 2002 tunnel is pre-established and pre-configured and a pre- configured multicast delivery tree is created.

16. Method according to claim 15 characterised in that
multiple multicast groups are multiplexed on the one pre- configured transport level multicast group tunnel in case the pre-configuration corresponds to the requirements of the multiple multicast groups.

17. Router adapted to perform a multicast transmission for a multicast group within a telecommunication network with said router and at least one host handling users, wherein between said router and the host at least one intermediate node is located

characterised by

means for handling a user request for registration to a
multicast group,
- means for providing a transport multicast group tunnel
established by means of a transport layer protocol for
tunnelling and,
means for administrating a relation between the
multicast group and the transport multicast group
tunnel .

18. Intermediate node adapted to perform a multicast
transmission for a multicast group within a
telecommunication network with a router and at least one host handling users, wherein between the router and the host at least one of said intermediate node is located

characterised by

P15133-MAZ 7 August, 2002 means for handling a user request for registration to a
multicast group,
means for providing a transport multicast group tunnel
established by means of a transport layer protocol for
tunnelling towards the host and,
means for administrating a relation between incoming and outgoing multicast data of the multicast transmission.

19. Host adapted to perform a multicast transmission for a multicast group within a telecommunication network with a router and at least one of said host handling users,
wherein between the router and the host at least one
intermediate node is located

characterised by

means for receiving multicast transmission and,
means for administration a relation between the received multicast transmission and the user in order to forward
the multicast transmission by means of radio bearer to
the user .

20. System adapted to perform a multicast transmission for a multicast group within a telecommunication network having a router and at least one of said host handling users, wherein between the router and the host at least one
intermediate node is located

characterised in that

the system includes at least one of the router according to claim 17, at least one of the intermediate node according to claim 18 and at least on of the host according to claim

P15133-MAZ 7 August, 2002 19 wherein in the system the method according to claim 1 is performed.

5133-MAZ 7 August, 2002