Mechanism for point-to-multipoint communication

1. A method for point-to-multipoint communication on a communications network, comprising

reserving, at a radio access network downlink, radio resources for a first downlink packet stream of a first mobile recipient, the packet stream being associated with group communication,

receiving a second downlink packet stream addressed to a second mobile recipient located in the same radio cell as said first downlink packet stream mobile recipient,

checking whether the second downlink packet stream is associated with group communication, and,

if the second downlink packet stream is associated with group communication, checking whether the second downlink packet stream is associated with the same group communication as the first downlink packet stream, and

if the second downlink packet stream is not associated with the same group communication as the first downlink packet stream, allocating new radio resources for said first downlink stream, and

if the second downlink packet stream is associated with the same group communication, allocating no new radio resources for the second downlink packet stream and instructing said second mobile recipient to receive said second downlink packet stream over said first downlink.

2. A method as claimed in claim 1 , wherein said first and second downlink packet streams are received from a group server controlling said group communication.

3. A method as claimed in claim 1 or 2 , wherein the radio access network requests an originator of said first and second downlink packet streams to suppress said second downlink packet stream, if the second mobile recipient is instructed to receive said first downlink packet stream over the radio resources already reserved for another mobile recipient located in the same cell.

4. A method as claimed in claim 1 or 2 , wherein said packets contain speech information.

5. A method as claimed in claim 1 or 2 , wherein said packets are Internet Protocol packets.

6. A method as claimed in claim 1 or 2 , wherein said packets contain speech information according to Voice over IP recommendations.

7. A method for point-to-multipoint communication on a communications network, comprising

reserving, at a radio access network downlink, radio resources for a first downlink packet stream of a first mobile recipient,

receiving, at a group server controlling group communication a single uplink packet stream from a sending party of said group communication, said uplink packet stream being addressed to said group server and containing information that associates it with said group communication,

multiplying said uplink packet stream into at least two downlink packet streams, each of which being individually addressed to one recipient of said group communication,

sending said downlink packet streams to the radio access network or networks serving the recipients of the group communication,

receiving, at the radio access network, a second downlink packet stream addressed to a second mobile recipient,

checking whether the second downlink packet stream is associated with group communication, and,

if the second downlink packet stream is associated with group communication, checking whether the second downlink packet stream is associated with group communication that has already reserved downlink radio resources for the first downlink packet stream of the first mobile recipient located in the same radio cell as said second mobile recipient, and

if the second downlink packet stream is not associated with group communication that has already reserved downlink radio resources for the first downlink packet stream of the first mobile recipient located in the same radio cell as said second mobile recipient, allocating new radio resources for said second downlink stream, and

if the second downlink packet stream is associated with group communication that has already reserved downlink radio resources for the first mobile recipient located in the same radio cell as said second mobile recipient, allocating no new radio resources for the second downlink packet stream and instructing said second mobile recipient to receive said first downlink packet stream over said already reserved radio resources.

8. A method as claimed in claim 7 , wherein the radio access network requests an originator of said first and second downlink packet streams to suppress said second downlink packet stream, if the second mobile recipient is instructed to receive said first downlink packet stream over the radio resources already reserved for another mobile recipient located in the same cell.

9. A method as claimed in claim 7 , wherein said packets contain speech information.

10. A method as claimed in any one of claims 7 to 9 , wherein said packets are Internet Protocol packets.

11. A method as claimed in any one of claims 7 to 9 , wherein said packets contain speech information according to Voice over IP recommendations.

12. A mobile communications system comprising

means for reserving at a radio access network downlink radio resources for a first downlink packet stream of a first mobile recipient, means for receiving a second downlink packet stream addressed to a second mobile recipient,

means for checking whether the second downlink packet stream is associated with group communication and for checking, in response to the second downlink packet stream being associated with group communication, whether the second downlink packet stream is associated with group communication that has already reserved downlink radio resources for a first downlink packet stream of a first mobile recipient located in the same radio cell as said second mobile recipient, and

means for allocating new radio resources for said second downlink stream in response to the second downlink packet stream not being associated with group communication that has already reserved downlink radio resources for the first downlink packet stream of the first mobile recipient located in the same radio cell as said second mobile recipient, and

means for instructing said second mobile recipient to receive said first downlink packet stream over said already reserved radio resources in response to the second downlink packet stream associated with group communication that has already reserved downlink radio resources for the first mobile recipient located in the same radio cell as said second mobile recipient.

13. A system as claimed in claim 12 , comprising means for sending to an originator of said first and second downlink packet streams a message commanding the originator to suppress said first downlink packet stream, if the first mobile recipient is instructed to receive the radio resources already reserved for another mobile recipient located in the same cell.

14. A system as claimed in claim 12 or 13 , wherein said packets are Internet Protocol packets.

15. A system as claimed in claim 14 , wherein said packets contain speech information according to Voice over IP recommendations.

16. A network element controlling radio resources in a radio access network receiving downlink packet streams addressed to mobile recipients located within said radio access network, wherein

said network element comprises means for reserving at the radio access network downlink radio resources for a first downlink packet stream of a first mobile recipient,

said network element being configured to respond to receiving, at the radio access network, a second downlink packet stream addressed to a second mobile recipient by checking whether the second downlink packet stream is associated with group communication and to check, in response to the second downlink packet stream being associated with group communication, whether the second downlink packet stream is associated with group communication that has already reserved downlink radio resources for a first downlink packet stream of a first mobile recipient located in the same radio cell as said second mobile recipient,

said network element being configured to allocate new radio resources for said second downlink stream in response to the second downlink packet stream not being associated with group communication that has already reserved downlink radio resources for the first downlink packet stream of the first mobile recipient located in the same radio cell as said second mobile recipient, and

said network element being configured to allocate no new radio resources for the second downlink packet stream and to instruct said second mobile recipient to receive said first downlink packet stream over said already reserved radio resources in response to the second downlink packet stream being associated with group communication which has already reserved downlink radio resources for the first mobile recipient located in the same radio cell as said second mobile recipient.