Alcatel

Nokia Technologies Oy

Laurent Jean André Thiebaut

Lieve Maria Marcella Rosemarijn Bos

Piotr Jan Wencel

Adrianus Johannes Van Ewijk

Lieve Maria Marcella Rosemarijin Bos

Telecommunication systems with packet-switched multimedia terminals and nodes for packet-switched multimedia sessions and with servers for exchanging multimedia signaling information for the packet-switched multimedia sessions and with terminating units are provided with gateways for in response to transferral messages originating from the packet-switched multimedia terminals and arriving at the servers transferring packet-switched multimedia sessions between packet-switched multimedia terminals and nodes to circuit-switched calls between gateways and circuit-switched terminals via switches, to continue possibly interrupted sessions via replacing calls. The servers send invitation messages to gateways, which send setup messages to switches for setting up circuit-switched calls via partly alternative communication paths. The servers send information messages to terminating units for bringing the terminating units from session level to call level. Preferably, a packet-switched multimedia terminal and a circuit-switched terminal are one and the same terminal.

Telecommunication system with packet-switched-multimedia-session-to-circuit-switched-call transferral

Telecommunication systems with packet-switched multimedia terminals () and nodes () for packet-switched multimedia sessions and with servers () for exchanging multimedia signaling information for the packet-switched multimedia sessions and with terminating units () are provided with gateways () for in response to transferral messages originating from the packet-switched multimedia terminals () and arriving at the servers () transferring packet-switched multimedia sessions between packet-switched multimedia terminals () and nodes () to circuit-switched calls between gateways () and circuit-switched terminals () via switches (), to continue possibly interrupted sessions via replacing calls. The servers () send invitation messages to gateways (), which send setup messages to switches () for setting up circuit-switched calls via partly alternative communication paths. The servers () send information messages to terminating units () for bringing the terminating units () from session level to call level. Transferral messages are session Initiation Protocol REFER messages comprising predefined Uniform Resource Locators to be converted into call numbers defining circuit-switched terminals (). Preferably, a packet-switched multimedia terminal () and a circuit-switched terminal () are one and the same terminal ().

A telecommunication network (TN) comprises a radio access network () defining cells in which user equipments () are localized and a core network () linked to the radio access network and adapted to establish a multimedia broadcast multicast context for the user equipments () located in the cells. It also comprises i) connecting means () arranged, when receiving a first request for broadcasting data to user equipments () localized in a broadcast area defined by at least one of the cells, to establish a first connection with the radio access network (), and ii) requesting means () arranged, when the first connection is established, to send a second request to the core network (), via the radio access network (), in order the core network () establishes a second connection with the radio access network () for signalling with it, and, when the second connection is established, to send a third request to the core network (), via the first and second connections, for establishment of a MBMS context, in order to activate a broadcast service for broadcasting the data to the user equipments () localized in the broadcast area.

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Antony, France

Laurent Jean André Thiebaut