ROBUST FILE CASTING FOR MOBILE TV

• US 20100050032A1
• Filed: 03/19/2008
• Published: 02/25/2010
• Est. Priority Date: 03/30/2007
• Status: Active Grant

• Current Assignee: InterDigital Patent Holdings, Inc. (InterDigital, Inc.)
• Original Assignee: Thomson Licensing (Vantiva SA)
• Inventors: Bichot, Guillaume, Alleaume, Vincent
• Granted Patent: US 8,341,479 B2
• Time in Patent Office: Days
• US Class Current: 714/746
• CPC Class Codes: H04L 1/1867 Arrangements specially adapted for the transmitter end
• CPC Class Codes: H04L 2001/0092 Error control systems characterised by the topology of the transmission link
• CPC Class Codes: H04N 21/2383 Channel coding or modulation of digital bit-stream, e.g. QPSK modulation arrangements for detecting or preventing errors in the information received by adapting the channel coding H04L1/0009; analogue front ends or means for connecting modulators, demodulators or transceivers to a transmission line H04L27/0002
• CPC Class Codes: H04N 21/4382 Demodulation or channel decoding, e.g. QPSK demodulation analog front ends or means for connecting modulators, demodulators or transceivers to a transmission line H04L27/0002
• CPC Class Codes: H04N 21/6375 for requesting retransmission , e.g. of data packets lost or corrupted during transmission from serverARQ protocols H04L1/18; implementation or adaptation of Internet protocol [IP], of transmission control protocol [TCP] or of user datagram protocol [UDP] H04L69/16
• CPC Class Codes: H04N 21/6377 directed to server one-way streaming services wherein the source is controlled by the destination H04L65/613
• CPC Class Codes: H04N 21/64315 DVB-H
• CPC Class Codes: H04N 21/658 Transmission by the client directed to the server

Abstract

The present invention concerns a repair control device and a method the repair control device for selecting a repair server among a plurality of repair servers, in a system where at least one terminal and the plurality of repair servers listen to at least one file delivery session distributed in a push mode from at least one file server. The method comprising the steps of receiving from at least one terminal a request for repairing a packet of the at least one file delivery session, selecting a repair server for repairing the packet to the at least one terminal and redirecting the request to the at least one terminal with the address of the selected repair server or forwarding the request to the selected repair server.

Claims

1-10. -10. (canceled)

11. Method at a repair control device for selecting a repair server among a plurality of repair servers, in a system where at least one terminal and said plurality of repair servers listen to at least one file delivery session distributed in a push mode from at least one file server, said method comprising the steps, at said repair control device, of:

receiving from said at least one terminal a request for repairing a packet of said at least one file delivery session,

polling said repair servers to identify if a repair server can repair said packet, and

if a repair server can repair said packet, indicating to said at least one terminal the address of said repair server, or forwarding said request to said repair server.

12. Method according to claim 11, wherein said repair servers are either of a first type or of a second type, where a repair server of a first type correctly receives only part of the packets transmitted by said file server, and a repair server of a second type correctly receives all the packets transmitted by said file server, the step of polling comprising the steps of:

successively sending, to each one of said repair server of the first type, a request for repairing a packet, until receiving a response with an indication that a repair server can repair said packet.

13. Method according to claim 11, if no repair server of the first type can repair said packet, selecting a repair server among said repair servers of a second type.

14. Method according to claim 11, wherein said repair control device performs the step of polling from the least loaded server to the most loaded server.

15. Method according to claim 11, wherein said repair control device performs the step of polling from the closest to the furthest repair server.

16. Method according to claim 11, wherein the file delivery session is a File Delivery over Unidirectional Transport session.

17. A repair control device, comprising:

communicating means for communicating to more than one repair server, and to at least one terminal, in a system where said more than one repair server and said at least one terminal listen to at least one file delivery session distributed in a push mode from at least one file server,

selecting means for, on reception of a repair request from said at least one terminal, polling said repair servers to identify if a repair server can repair said packet and selecting said repair server, and

redirecting means for indicating to said at least one terminal the address of said repair server or for forwarding said request to said repair server.