Method and device for transmitting a data stream in a multicast transmission mode

A client device able to receive a data stream according to a multicast transmission mode from a server device, comprising at least one processor configured to:

• obtain a first request for subscription to a multicast group, referred to as the target multicast group, allowing obtaining of a data stream;
• replace the first request for subscription to the target multicast group with a plurality of second subscription requests, each second subscription request being associated with a multicast subgroup in a set of multicast subgroups, each multicast subgroup allowing obtaining of a data sub-stream forming a subpart of the data stream, all the multicast subgroups allowing obtaining of said data stream by combining the data sub-streams;
• associate a network interface with each second subscription request, each associated network interface being taken from a set of network interfaces connecting the server device to the client device and available on the client device;
• transmit each second subscription request to the server device on the network interface that was associated with it;
• receive data sub-streams corresponding to the second subscriptions transmitted, each data sub-stream received being received over the network interface over which the second subscription request associated with said data sub-stream was transmitted;
• and
• reconstruct the data stream using the data sub-streams received in order to enable use of said data stream
• wherein, following the obtaining of the first request for subscription to the target multicast group, the client device seeks information representing said target multicast group in a set of information representing multicast groups, the first subscription request being replaced by the second subscription requests when the information representing said target multicast group is found in the set of information representing multicast groups.

A communication system, comprising:

• a server device;
• and
• at least one client device able to receive a data stream according to a multicast transmission mode from the server device, comprising at least one processor configured to:
• obtain a first request for subscription to a multicast group, referred to as the target multicast group, allowing obtaining of a data stream;
• replace the first request for subscription to the target multicast group with a plurality of second subscription requests, each second subscription request being associated with a multicast subgroup in a set of multicast subgroups, each multicast subgroup allowing obtaining of a data sub-stream forming a subpart of the data stream, all the multicast subgroups allowing obtaining of said data stream by combining the data sub-streams;
• associate a network interface with each second subscription request, each associated network interface being taken from a set of network interfaces connecting the server device to the client device and available on the client device;
• transmit each second subscription request to the server device on the network interface that was associated with it;
• receive data sub-streams corresponding to the second subscriptions transmitted, each data sub-stream received being received over the network interface over which the second subscription request associated with said data sub-stream was transmitted;
• and
• reconstruct the data stream using the data sub-streams received in order to enable use of said data stream
• wherein, following the obtaining of the first request for subscription to the target multicast group, the client device seeks information representing said target multicast group in a set of information representing multicast groups, the first subscription request being replaced by the second subscription requests when the information representing said target multicast group is found in the set of information representing multicast groups.