System and method for improving the file transmission reliability

1. A method at a file server for sending more than one file to more than one receiver, comprising the steps of:

aggregating said files into a container, said container being initialized to a default size,

splitting said container into more than one packet, and transmitting said more than one packet to said more than one receiver, wherein, a reception of at least one packet by any of said more than one receiver of the container enables said any one of said more than one receiver to request a retransmission of lost packets of the container; the method further comprising the steps of:

receiving an indication of the number of consecutive lost packets of the container per at least one of said more than one receiver; and

adapting the size of the container, as a function of the number of consecutive lost packets received by at least one of said more than one receiver.

2. The method according to claim 1 , wherein the size of the logical container is further based on the number of receivers that report a number of consecutive lost packets.

3. The method according to claim 2 , wherein, if the number of receivers is above a reference value, the size is increased, and if the number of receivers is below said reference value, the size is decreased.

4. The method according to claim 1 , wherein the size of the logical container is dependent on the reception buffer size of said more than one receiver.

5. The method according to claim 1 , wherein the packets are transmitted with the File Delivery over Unidirectional Transport protocol, FLUTE protocol.

6. The method according to claim 5 , wherein the step of receiving an indication comprises the step of getting information on the requests for retransmission received from said receivers.

7. The method according to claim 1 , wherein the step of receiving an indication comprises the step of receiving, from said receivers a report on the number of consecutive lost packets

8. The method according to claim 1 , wherein the size of the logical container is initially set to a default value, and the value of the size of the logical container can only be higher or equal to said default value.

9. A mobile terminal comprising:

a communicating interface configured to receive packets comprised in at least a first or a second container built and broadcasted by a server, and communicating with said server, said packets being part of a container, said container being an aggregation of more than one file, and

a file reception computing module configured check the reception of said packet, wherein the mobile terminal further comprises:

a file reception reporting module configured to report the number of consecutive lost packets of the container to the server.

10. A file server comprising:

a communicating interface configured to broadcast more than one file to more than one receiver, said files being aggregated into a container, said container, said container being initialized to a default size, and,

a file aggregating module configured to build said container, splitting said container into more than one packet and sending said packets to said more than one receiver; wherein the file server further comprises:

an aggregating loss value computing module configured to receive an indication of the number of consecutive lost packets of the container per at least one of said more than one receiver, and adapting the size of the container to the number of consecutive lost packets at said more than one receiver.