Method and apparatus for transmitting and receiving uncompressed audio/video data and transmission frame structure

• US 20070258651A1
• Filed: 03/09/2007
• Published: 11/08/2007
• Est. Priority Date: 05/03/2006
• Status: Active Grant

• Current Assignee: Samsung Electronics Co. Ltd.
• Original Assignee: Samsung Electronics Co. Ltd.
• Inventors: Kwon, Chang-yeul, Shin, Se-young
• Granted Patent: US 8,422,549 B2
• Time in Patent Office: Days
• US Class Current: 382/232
• CPC Class Codes: H04L 1/0003 by switching between different modulation schemes
• CPC Class Codes: H04L 1/0009 by adapting the channel coding H04L1/1812 takes precedence
• CPC Class Codes: H04L 1/0025 Transmission of mode-switching indication
• CPC Class Codes: H04L 1/007 Unequal error protection for format H04L1/0078; for codes per se H03M13/35
• CPC Class Codes: H04L 1/0086 Unequal error protection H04L27/00 and H04L1/004 take precedence for layer 1/2 aspects, e.g. bit loading
• CPC Class Codes: H04L 1/1819 with retransmission of additional or different redundancy
• CPC Class Codes: H04L 2001/0098 Unequal error protection

Abstract

An apparatus for efficiently transmitting and receiving uncompressed AV data by using UEP during high-frequency wireless communication, as well as a transmission frame structure to which the UEP is applied are provided. A method of transmitting uncompressed AV data includes determining whether a transmission efficiency of uncompressed AV data drops below a threshold while the uncompressed AV data is transmitted; deciding whether to use a UEP mode if it is determined that the transmission efficiency has dropped below the threshold, the UEP mode indicating a manner of dividing bits, the bits constituting the uncompressed AV data, into significant bits and non-significant bits; and retransmitting the uncompressed AV data by using the UEP mode based on decision regarding use of the UEP mode.

Claims

1. A method of transmitting uncompressed audio or video (AV) data, the method comprising:

determining whether a transmission efficiency of uncompressed AV data drops below a threshold while the uncompressed AV data is transmitted;

deciding to use an unequal error protection (UEP) mode if it is determined that the transmission efficiency has dropped below the threshold; and

retransmitting the uncompressed AV data by using the UEP mode,

wherein the UEP mode indicates a manner of dividing bits into significant bits and non-significant bits, and the bits constitute the uncompressed AV data.

2. The method of claim 1, wherein the deciding to use of the UEP mode is made based on a physical (PHY) header of the uncompressed AV data.

3. The method of claim 1, wherein the retransmitting the uncompressed AV data comprises:

making a request that a reception device recommend the UEP mode by designating a UEP mode request (UMR) field as 1, the UMR field being contained in a media access control (MAC) header of the uncompressed AV data;

selecting and recommending the UEP mode adapted to a current transmission efficiency based on the request by the reception device;

receiving the UEP mode from the reception device; and

retransmitting the uncompressed AV data in accordance with the UEP mode.

4. The method of claim 3, wherein the making the request comprises setting up a URM identifier (UMRI) field in the MAC header, the UMRI field being endowed with an identifier (ID) of the UMR field, and transmitting a frame to the reception device, the frame containing the MAC header.

5. The method of claim 4, wherein the selecting and recommending the UEP mode comprises setting up a recommended UEP mode identifier (RUMI) field in the MAC header of the frame, the RUMI field being endowed with an ID of the UEP mode, and transmitting the frame to a transmission device, the frame containing the MAC header.

6. The method of claim 1, further comprising:

modifying the UEP mode if the transmission efficiency has dropped below the threshold again; and

retransmitting uncompressed AV data based on the modified UEP mode.

7. The method of claim 1, wherein the determining comprises receiving an error response from a reception device as a basis of determination, the reception device receiving the uncompressed AV data.

8. The method of claim 1, wherein, based on the manner of dividing bits into significant bits and non-significant bits, bits belonging to a predetermined number of high bit levels are selected from the bits constituting the uncompressed AV data and designated as the significant bits, and remaining bits are designated as the non-significant bits.

9. A method of receiving uncompressed audio or video (AV) data, the method comprising:

determining whether a reception efficiency of uncompressed AV data drops below a threshold while the uncompressed AV data is being received;

confirming whether a first unequal error protection (UEP) mode is used for the uncompressed AV data, if it is determined that the reception efficiency has dropped below the threshold; and

requesting retransmission of uncompressed AV data if it is confirmed that the first UEP mode has been used,

wherein the first UEP mode indicates a manner of dividing bits into significant bits and non-significant bits, and the bits constitute the uncompressed AV data.

10. The method of claim 9, wherein a physical (PHY) header of the uncompressed AV data contains information regarding whether the first UEP mode is used.

11. The method of claim 9, wherein the requesting retransmission of uncompressed AV data comprises:

determining whether a UEP mode request (UMR) field has been designated as 1, the UMR field being contained in a media access control (MAC) header of the uncompressed AV data;

receiving a request for recommendation of a second UEP mode adapted to a current data reception rate from a transmission device if it is determined that the UMR has been designated as 1;

selecting and recommending the second UEP mode adapted to the current data reception rate based on the request; and

transmitting the second UEP mode to the transmission device and requesting the transmission device to retransmit uncompressed AV data based on the second UEP mode.

12. The method of claim 11, wherein the selecting and recommending the second UEP mode comprises:

setting up a recommended UEP mode identifier (RUMI) field in an MAC header of a received frame, the RUMI field being endowed with an identifier (ID) of the second UEP mode; and

transmitting the received frame to the transmission device.

13. The method of claim 9, further comprising:

modifying the first UEP mode if the reception efficiency has dropped below the threshold again; and

receiving uncompressed AV data again based on the modified first UEP mode.

14. The method of claim 9, wherein, based on the manner of dividing bits into significant bits and non-significant bits, bits belonging to a predetermined number of high bit levels are selected from the bits constituting the uncompressed AV data and are designated as significant bits, and remaining bits are designated as the non-significant bits.

15. An apparatus which transmits uncompressed audio or video (AV) data, the apparatus comprising:

a transmission-efficiency-determination unit which determines whether a transmission efficiency of uncompressed AV data drops below a threshold while the uncompressed AV data is transmitted;

an unequal error protection (UEP) mode decision unit which decides to use a UEP mode if the transmission-efficiency-determination unit determines that the transmission efficiency has dropped below the threshold;

a channel coding unit which performs coding of the uncompressed AV data by using the UEP mode; and

an RF unit which retransmits the uncompressed AV data coded by the channel coding unit,

wherein the first UEP mode indicates a manner of dividing bits into significant bits and non-significant bits, and the bits constitute the uncompressed AV data.

16. The apparatus of claim 15, wherein a physical (PHY) header of the uncompressed AV data contains information regarding the decision regarding use of the UEP mode.

17. The apparatus of claim 15, wherein the UEP mode decision unit makes a request that a reception device recommend the UEP mode adapted to a current transmission efficiency by designating a UEP mode request (UMR) field as 1, the UMR field being contained in a media access control (MAC) header of the uncompressed AV data, the UEP mode decision unit deciding to use the UEP mode recommended by the reception device based on the request.

18. The apparatus of claim 17, wherein the MAC header contains a UMR identifier (UMRI) field endowed with an identifier (ID) of the UMR field.

19. The apparatus of claim 15, wherein the channel coding unit modifies the UEP mode and performs coding if the transmission efficiency has dropped below the threshold again.

20. The apparatus of claim 15, wherein the transmission-efficiency-determination unit determines whether the transmission efficiency drops below the threshold based on an error response from a reception device that receives the uncompressed AV data.

21. The apparatus of claim 15, wherein, based on the manner of dividing bits into significant bits and non-significant bits, bits belonging to a predetermined number of high bit levels are selected from the bits constituting the uncompressed AV data and designated as the significant bits, and remaining bits are designated as the non-significant bits.

22. An apparatus which receives uncompressed audio or video (AV) data, comprising:

a reception-efficiency-determination unit which determines whether a reception efficiency of uncompressed AV data drops below a threshold while the uncompressed AV data is received;

a channel-decoding unit which confirms whether a first unequal error protection (UEP) mode is used for the uncompressed data and decodes the uncompressed AV data if the reception-efficiency-determination unit determines that the reception efficiency has dropped below the threshold; and

a retransmission request unit which requests retransmission of uncompressed AV data if it the channel-decoding unit confirms that the first UEP mode has been used,

wherein the first UEP mode indicates a manner of dividing bits into significant bits and non-significant bits, and the bits constitute the uncompressed AV data.

23. The apparatus of claim 22, wherein a physical (PHY) header of the uncompressed AV data contains information regarding whether the first UEP mode is used.

24. The apparatus of claim 22, wherein the retransmission request unit determines whether a UEP mode request (UMR) field has been designated as 1, the UMR field being contained in a media access control (MAC) header of the uncompressed AV data, the retransmission request unit requests a transmission device to retransmit uncompressed AV data if it is determined that the UMR field has been designated as 1, a recommended UEP mode adapted to a current data reception rate being applied to the uncompressed AV data.

25. The apparatus of claim 24, wherein the MAC header of the uncompressed AV data contains a recommended UEP mode (RUM) field which designates the recommended UEP mode and a recommended UEP mode identifier (RUMI) field endowed with an identifier (ID) of the RUM field.

26. The apparatus of claim 22, wherein the retransmission request unit modifies the first UEP mode and requests retransmission of uncompressed AV data, the modified first UEP mode being applied to the uncompressed AV data, if the reception efficiency has dropped below the threshold again.

27. The apparatus of claim 22, wherein, based on the manner of dividing bits into significant bits and non-significant bits, bits belonging to a predetermined number of high bit levels are selected from the bits constituting the uncompressed AV data and designated as the significant bits, and remaining bits are designated as the non-significant bits.

28. A method of transmitting uncompressed audio or video (AV) data, the method comprising:

generating transmission frame structure which transmits the uncompressed AV data; and

transmitting the transmission frame structure,

wherein the transmission frame structure comprises;

a payload which comprises a plurality of transmission data units (TDUs) classified in accordance with significance of bits constituting the uncompressed AV data, the TDUs having been subjected to error-protection coding at a predetermined coding ratio;

a media access control (MAC) header added to the payload, a leak adaptation field (LAF) having been set up in the MAC header to code the uncompressed AV data by using a first unequal protection (UEP) mode indicating a manner of dividing bits, the bits constituting the uncompressed AV data, into significant bits and non-significant bits; and

a physical (PHY) header added to the MAC header, the PHY header containing information regarding whether the first UEP mode is used, wherein

the MAC header contains a UMR field and a UMRI field endowed with an identifier (ID) of the UMR field, the UMR field requesting a reception device to recommend a second UEP mode adapted to a current transmission efficiency.

29. The method of claim 28, wherein the UMR field designates a field value as 1 and requests recommendation of the second UEP mode if the transmission efficiency has dropped below a threshold.

30. The method of claim 28, wherein the PHY header further contains information regarding number of bit levels contained in the TDUs, information regarding a modulation mode, and information regarding a mode index indicating a combination of the information regarding number of bit levels and the information regarding a modulation mode.

31. The method of claim 28, wherein the MAC header contains a recommended UEP mode (RUM) field and a recommended UEP mode identifier (RUMI) field endowed with an ID of the RUM field, the RUM field recommending the second UEP mode adapted to the current data reception rate if a UEP mode request (UMR) field contained in an MAC header of received uncompressed AV data has been designated as 1.

32. The method of claim 31, wherein the RUM field is adapted to recommend a modified UEP mode if a reception efficiency has dropped below a threshold.