Lossless data coding for bidirectional communication in a collaborative session of multimedia content exchange

• US 9,584,576 B2
• Filed: 03/01/2012
• Issued: 02/28/2017
• Est. Priority Date: 03/03/2011
• Status: Active Grant

• Current Assignee: Institut Mines-Télécom, Prologue Co.
• Original Assignee: Institut Mines-Télécom, Prologue Co.
• Inventors: Marshall, James Iain, Mitrea, Petru Mihai, Joveski, Bojan, Gardenghi, Ludovico, Preteux, Jacqueline Franoise
• Primary Examiner(s): Vostal, O. C.
• Application Number:
  US14/002,650
• Publication Number:
  US 20140219295A1
• Time in Patent Office: 1,825 Days
• Field of Search: 709/247
• US Class Current: 1/1
• CPC Class Codes: H03M 7/3088 employing the use of a dictionary, e.g. LZ78
• CPC Class Codes: H04L 65/1069 Session establishment or de-establishment
• CPC Class Codes: H04L 65/4038 with floor control
• CPC Class Codes: H04L 65/65 Network streaming protocols, e.g. real-time transport protocol [RTP] or real-time control protocol [RTCP]
• CPC Class Codes: H04L 65/70 Media network packetisation
• CPC Class Codes: H04N 21/643 Communication protocols network streaming protocols, e.g. real-time transport protocol [RTP] or real-time control protocol [RTCP], H04L65/65

Abstract

The disclosed method for coding data includes the exchange between the transmitter and the receiver, in the course of the session, of attributes of collaboration messages that are able to be used in said session and of indices associated with these attributes. In various implementations, the attributes and their indices may be used by these pieces of equipment for updating a shared dictionary of indexed attributes. Upon coding, the attributes of the collaboration messages may be substituted with their indices; and upon decoding, the inverse operation may be carried out. The shared dictionaries may be destroyed at the end of the session.

Claims

1. A method, performed by a microprocessor and a memory, for lossless data coding applied by a piece of transmitter equipment, in bidirectional communication with at least one piece of receiver equipment in a collaborative session of exchange of multimedia contents, which reduces a volume of data compared to a conventional approach, the method comprising:

exchanging with the at least one piece of receiver equipment, during the collaborative session, at least one attribute of a collaboration message which may be used in the collaborative session and an index associated with the at least one attribute, the at least one attribute and the index being used by the piece of transmitter equipment and by the at least one piece of receiver equipment for updating a shared dictionary of indexed attributes, the shared dictionary being stored in memory by both the piece of transmitter equipment and the at least one piece of receiver equipment for the entire duration of the collaborative session;

substituting, in a collaboration message intended to be sent to the at least one piece of receiver equipment, the at least one attribute with the index in the shared dictionary, wherein the size of the at least one attribute is greater than the size of the index in the shared dictionary;

sending the collaboration message to the at least one piece of receiver equipment; and

destroying the shared dictionary at the end of the collaborative session.

2. The method according to claim 1, wherein the collaboration message is selected from the group consisting of:

a listing message for updating of the shared dictionary of indexed attributes during the collaborative session;

a message specifying a state of presence of the at least one piece of transmitter equipment;

a message including pieces of information intended for the piece of receiver equipment; and

a message including metadata for administration or control of a collaboration system.

3. The method according to claim 2, wherein said collaboration message includes:

a field representative of a nature of the collaboration message;

an attribute representative of the semantics of the nature; and

a binary element representative of the presence or not of the attribute in the collaboration message, followed, when the attribute is present, by a body including the index associated with the value of the attribute in the shared dictionary.

4. The method according to claim 1, wherein said collaborative session is compliant with the XMPP standard.

5. The method according to claim 1, wherein the multimedia contents are compliant with a standard of the MPEG family, the collaborative session applying the RTP protocol for exchange of the multimedia contents and the RTSP protocol for initialization and control of the exchange.

6. A method, performed by a microprocessor and a memory, for decoding data applied by apiece of receiver equipment, in bidirectional communication with at least one piece of transmitted equipment in a collaborative session of exchange of multimedia contents, which reduces a volume of data compared to a conventional approach, the method comprising:

exchanging with the at least one piece of transmitter equipment, at least one attribute of a collaborative message with may be used in the collaborative session and an index associated with the at least one attribute, the at least one attribute and the index being used by the piece of receiver equipment and by the at least one piece of transmitter equipment for updating a shared dictionary of indexed attributes, the shared dictionary being stored in memory by both the piece of receiver equipment and the at least one piece of transmitter equipment for the entire duration of the collaborative session;

receiving a collaboration message transmitted by the at least one piece of transmitter equipment including at least one index;

substituting, in the collaboration message the at least one index with the attribute with which the at least one index is associated in the shared dictionary, wherein the size of the at least one attribute is greater than the size of the index in the shared dictionary; and

destroying the shared dictionary at the end of the collaborative session.

7. The method according to claim 6, wherein the collaboration message is selected from the group consisting of:

a listing message for updating of the shared dictionary of indexed attributes during the collaborative session;

a message specifying a state of presence of the at least one piece of transmitter equipment;

a message including pieces of information intended for the piece of receiver equipment; and

a message including metadata for administration or control of a collaboration system.

8. The method according to claim 7, wherein the collaboration message includes:

a field representative of a nature of the collaboration message;

an attribute representative of the semantics of the nature; and

a binary element representative of the presence or not of the attribute in the collaboration message, followed, when the attribute is present, by a body including the index associated with the value of the attribute in the shared dictionary.

9. The method according to claim 6, wherein said collaborative session is compliant with the XMPP standard.

10. The method according to claim 6, wherein the multimedia contents are compliant with a standard of the MPEG family, the collaborative session applying the RTP protocol for exchange of the multimedia contents and the RTSP protocol for initialization and control of this the exchange.

11. A lossless data coding device which may be incorporated into a piece of transmitter equipment capable of establishing a bidirectional communication with at least one piece of receiver equipment in a collaborative session of exchange of multimedia contents, which reduces a volume of data compared to a conventional approach

a memory containing instructions;

and

a microprocessor, operably connected to the memory, that executes the instructions to perform operations comprising;

exchanging with the at least one piece of receiver equipment, during the collaborative session, at least one attribute of a collaboration message which may be used in the collaborative session and an index associated with the at least one attribute, the at least one attribute and the index being used by the piece of transmitter equipment and by the at least one piece of receiver equipment for updating a shared dictionary of indexed attributes;

storing in the memory the shared dictionary for the entire duration of the collaborative session;

substituting, in a collaboration message intended to be sent to the at least one piece of receiver equipment, the at least one attribute with the index in the shared dictionary, wherein the size of the at least one attribute is greater than the size of the index in the shared dictionary;

sending the collaboration message to the at least one piece of receiver equipment; and

destroying the shared dictionary at the end of the collaborative session.

12. A communication device including a coding device according to claim 11.

13. Communication equipment including a device according to claim 12.

14. A collaboration system including at least one piece of equipment according to claim 13.

18. The collaboration system of claim 14, further including at least one piece of equipment according to claim 17.

15. A data decoding device which may be incorporated in a piece of receiver equipment capable of establishing a bidirectional communication with at least one piece of transmitter equipment in a collaborative session of exchange of multimedia contents, which reduces a volume of data compared to a conventional approach, the device comprising:

a memory containing instructions; and

a microprocessor, operably connected to the memory, that executes the instructions to perform operations comprising;

exchanging with the at least one piece of transmitter equipment, during the collaborative session, at least one attribute of a collaboration message which may be used in the collaborative session and an index associated with the at least one attribute, the at least one attribute and the index being used by the piece of receiver equipment and by the at least one piece of transmitter equipment for updating a shared dictionary of indexed attributes;

receiving a collaborating message transmitted by the at least one piece of transmitter equipment including at least one index;

substituting, in the collaboration message, the at least one index with the attribute with which the at least one index is associated in the shared dictionary, wherein the size of the at least one attribute is greater than the size of the index in the shared dictionary; and

destroying the shared dictionary at the end of the collaborative session.

16. A communication device including a decoding device according to claim 15.

17. Communication equipment including a device according to claim 16.