Method and system for transmission of uncompressed video over wireless communication channels

• US 8,363,675 B2
• Filed: 03/20/2007
• Issued: 01/29/2013
• Est. Priority Date: 03/24/2006
• Status: Expired due to Fees

• Current Assignee: Samsung Electronics Co. Ltd.
• Original Assignee: Samsung Electronics Co. Ltd.
• Inventors: Singh, Harkirat, Shao, Huai-Rong, Ngo, Chiu
• Primary Examiner(s): Afshar, Kamran
• Assistant Examiner(s): Siddiqui, Kashif
• Application Number:
  US11/725,668
• Publication Number:
  US 20070240191A1
• Time in Patent Office: 2,142 Days
• Field of Search: 370328-338, 370/349, 370/394, 3703951-3954, 714/701, 714/704, 714/758, 714/52, 714/748, 714/769, 714/807, 37524001-241, 725/81, 348/600
• US Class Current: 370/473
• CPC Class Codes: H04L 1/0041 Arrangements at the transmitter end
• CPC Class Codes: H04L 1/0061 Error detection codes
• CPC Class Codes: H04L 1/007 Unequal error protection for format H04L1/0078; for codes per se H03M13/35
• CPC Class Codes: H04L 1/0075 Transmission of coding parameters to receiver H04L1/0023 takes precedence
• CPC Class Codes: H04L 1/0083 Formatting with frames or packets; Protocol or part of protocol for error control
• CPC Class Codes: H04L 1/1614 using bitmaps
• CPC Class Codes: H04L 1/1621 Group acknowledgement, i.e. the acknowledgement message defining a range of identifiers, e.g. of sequence numbers
• CPC Class Codes: H04L 1/1809 Selective-repeat protocols
• CPC Class Codes: H04L 1/1887 Scheduling and prioritising arrangements
• CPC Class Codes: H04N 19/66 involving data partitioning, i.e. separation of data into packets or partitions according to importance
• CPC Class Codes: H04N 19/89 involving methods or arrangements for detection of transmission errors at the decoder
• CPC Class Codes: H04N 7/18 Closed-circuit television [CCTV] systems, i.e. systems in which the video signal is not broadcast

Abstract

A method and system is provided for transmission of video information pixels over wireless channels, where each video pixel includes a plurality of components and each component comprises video information bits. The information bites are logically grouped into multiple logical groups in a packet, and error detection information is determined for each logical group. The error detection information is placed in the packet, and the packet is transmitted from a transmitter to a receiver over a wireless channel.

Claims

1. A method for transmission of video information over a wireless channel, comprising:

inputting video pixels, wherein each pixel includes a plurality of components and each component comprises video information bits;

logically grouping the information bits into multiple logical groups in a packet based on the perceptual importance of the information bits;

determining error detection information for each logical group;

placing the error detection information in the packet, wherein placing the error detection information in the packet comprises placing the error detection information for each logical group in a corresponding error detection field in the packet; and

transmitting the packet from a transmitter over a wireless channel to a receiver.

2. The method of claim 1 wherein determining error detection information for each logical group comprises determining a CRC value for the information bits in each logical group.

3. The method of claim 1 wherein the packet includes multiple error detection fields corresponding to the multiple logical groups.

4. The method of claim 1 wherein logically grouping the information bits into multiple logical groups comprises logically grouping the information bits into multiple logical groups in the packet based on the perceptual importance of the information bits.

5. The method of claim 4 wherein logically grouping the information bits into multiple logical groups comprises logically grouping N information bits B₀, . . . , B_N-1 per pixel component, into K logical groups LG₀, . . . , LG_K-1, such that information bits with related perceptual importance are grouped in the same logical group.

6. The method of claim 5 wherein the information bits with the same perceptual importance are grouped in the same logical group.

7. The method of claim 5 wherein the MSBs of the information bits are grouped in one logical group and the LSBs of the information bits are grouped in another logical group.

8. The method of claim 4 wherein each pixel component comprises N bits, such that logically grouping the information bits into multiple logical groups comprises logically grouping the information bits into K logical groups such that the information bits with the same perceptual importance are grouped in the same logical group.

9. The method of claim 4 wherein each pixel component comprises N bits ranging from a MSB to a LSB in terms of perceptual importance, such that logically grouping the information bits into multiple logical groups comprises logically grouping the information bits into K logical groups, wherein the information bits with the same perceptual importance are grouped in the same logical group.

10. The method of claim 9 wherein each pixel component comprises N bits, B₀, . . . , B_N-1, ranging from a MSB B_N-1 to a LSB B₀ in terms of perceptual importance, such that logically grouping the information bits into multiple logical groups comprises logically grouping the information bits into K logical groups LG₀, . . . , LG_K-1, wherein K<

N, such that one or more bits of a pixel component are mapped to one logical group.

11. The method of claim 10 wherein N can be one of 8, 10, 12 or 16 bits per pixel component, and K=2 logical groups, wherein pixel component bits from a MSB B_N-1 to a bit B_N/2 are mapped to a first logical group LG₁, and pixel component bits from a bit B_N/2-1 to a LSB B₀ are mapped to second logical group LG₁.

12. The method of claim 10 wherein K=N such that the bits B_N-1 for all pixels in the packet are grouped in logical group LG_N-1, the bits B_N-2 for all pixels in the packet are grouped in logical group LG_N-2, and so on.

13. The method of claim 10 wherein one or more logical groups are protected against channel errors with modulation and coding that according to the perceptual importance of each logical group.

14. The method of claim 13 wherein determining error detection information for each logical group comprises determining a CRC (Cyclic Redundancy Check) value for the information bits in each logical group.

15. The method of claim 14 wherein coding and modulation for a CRC field match those for the corresponding logical group.

16. The method of claim 14 further comprising placing a CRC control field in a MAC header of the packet to signal the receiver how the logical groups are formed for CRC error detection at the receiver.

17. The method of claim 16 wherein the CRC control field includes:

a CRC count (CRCC) field that indicates the number of logical groups formed in the packet, and a CRCBitmap field which is repeated CRCC times or the number of logical groups formed.

18. The method of claim 17 further including negotiating a CCRC control field between the transmitter and the receiver before commencing transmission of packets.

19. The method of claim 18 further including using an array of N bits in the CRCBitmap field for N bitplanes per pixel component.

20. The method of claim 19 wherein the MSB of the CRCBitmap corresponds to the MSB bitplane, and zero array entries in the CRCBitmap identify bitplanes that are excluded from the logical group, and thus, excluded from the CRC computation.

21. The method of claim 20 wherein non-zero array entries identify bitplanes that are included in the logical group, and thus, included in the CRC computation.

22. The method of claim 1 further comprising:

receiving the packet at the receiver;

based on the CRC values determining the corrupted packet information;

generating an ACK frame to indicate the corrupted information to the transmitter; and

transmitting the ACK frame back to the transmitter.

23. The method of claim 22 further comprising:

receiving an ACK frame at the transmitter;

based on the ACK frame, generating a retransmit packet including information bits that are indicated as corrupted in the last packet by the ACK frame; and

selectively retransmitting the bits corresponding to the corrupted logical groups to the receiver.

24. The method of claim 23 wherein generating a retransmit packet comprises generating a retransmit packet including information bits that are indicated as corrupted in the last packet by the ACK frame, based on human perceptual importance of such data.

25. The method of claim 23 further comprising:

receiving P ACK frames at the transmitter;

based on the P ACK frames, determining the logical groups in the last P packets that need retransmissions;

retransmitting a correct copy of the information bits in the corrupted logical groups from a high priority logical group in perceptual importance, and continuing the retransmitting of other corrupted logical groups in order of priority, without violating the receiver'"'"'s presentation deadline.

26. The method of claim 25 further comprising:

placing a CRC control field in a MAC header of each packet to signal to the receiver how the logical groups are formed for CRC error detection at the receiver, the CRC control field including a CRC count (CRCC) field that indicates the number of logical groups formed in the packet, and a CRCBitmap field which is repeated CRCC times or the number of logical groups formed;

wherein the number of ACK bits is less than or equal to the CRC Count (CRCC) which indicate the number of CRCs, the method further including the receiver using the CRC fields for performing error concealment in the absence of retransmissions.

27. The method of claim 26, further comprising generating an ACK frame to indicate the corrupted information for the highest priority logical groups according to perceptual importance.

28. The method of claim 27 further including, based on CRC calculations, determining if the lowest priority logical groups according to perceptual importance are correctly received by the receiver, and performing error concealment for the lowest priority logical groups received corrupt at the receiver, in the absence of retransmissions.

29. The method of claim 1 further comprising:

receiving a packet at the receiver; and

based on the CRC values, determining the corrupted packet information and performing error concealment to recover the bit errors.

30. The method of claim 1 further comprising selectively retransmitting to the receiver, bits corresponding to logical groups corrupted in transmission.

33. The system of claim 30 wherein the packet includes multiple error detection fields corresponding to the multiple logical groups.

31. A wireless system for transmission of uncompressed video information including pixels, each pixel including a plurality of components and each component including video information bits, the system comprising:

a wireless transmitter; and

a wireless receiver;

wherein the wireless transmitter includes;

a logical grouping module configured to logically group the information bits into multiple logical groups in a packet;

an error detection information generating module configured to generate error detection information for each logical group in the packet, wherein the error detection information generating module is configured to place the error detection information for each logical group in a corresponding error detection field in the packet; and

a communication module configured to transmit the packet with the error detection information over a wireless channel to the receiver.

32. The system of claim 31 wherein an error detection information generating module is configured to determine error detection information for each logical group by determining a CRC value for the information bits in each logical group.

34. The system of claim 32 wherein the logical grouping module is configured to logically group the information bits into multiple logical groups in the packet based on the perceptual importance of the information bits.

35. The system of claim 34 wherein the information bits with related perceptual importance are grouped in the same logical group.

36. The system of claim 35 wherein the information bits with the same perceptual importance are grouped in the same logical group.

37. The system of claim 35 wherein the MSBs of the information bits are grouped in one logical group and the LSBs of the information bits are grouped in another logical group.

38. The system of claim 34 wherein each pixel component comprises N bits and the logical grouping module is configured to logically group the information bits into K logical groups such that the information bits with the same perceptual importance are grouped in the same logical group.

39. The system of claim 34 wherein each pixel component comprises N bits ranging from a MSB to a LSB in terms of perceptual importance, and the logical grouping module is configured to logically group the information bits into K logical groups wherein the information bits with the same perceptual importance are grouped in the same logical group.

40. The system of claim 39 wherein each pixel component comprises N bits, B₀, . . . , B_N-1, ranging from a MSB B_N-1 to a LSB B₀ in terms of perceptual importance, and the logical grouping module is configured to logically group the information bits into K logical groups LG₀, . . . , LG_K-1, wherein K<

N, such that one or more bits of a pixel component are mapped to one logical group.

41. The system of claim 39 wherein N can be one of 8, 10, 12 or 16 bits per pixel component, and K=2 logical groups, wherein pixel component bits from a MSB B_N-1 to a bit B_N/2 are mapped to a first logical group LG₁, and pixel component bits from a bit B_N/2-1 to a LSB B₀ are mapped to second logical group LG₁.

42. The system of claim 40 wherein K=N such that the bits B_N-1 for all pixels in the packet are grouped in logical group LG_N-1, the bits B_N-2 for all pixels in the packet are grouped in logical group LG_N-2, and so on.

43. The system of claim 39 wherein one or more logical groups are protected against channel errors with modulation and coding that according to the perceptual importance of each logical group.

44. The system of claim 40 wherein the an error detection information generating module is configured to determine error detection information for each logical group by determining a CRC (Cyclic Redundancy Check) value for the information bits in each logical group.

45. The system of claim 44 wherein coding and modulation used for a CRC field match those used for the corresponding logical group.

46. The system of claim 44 wherein the communication module is further configured to place a CRC control field in a MAC header of the packet to signal the receiver how the logical groups are formed for CRC error detection at the receiver.

47. The system of claim 46 wherein the CRC control field includes:

a CRC count (CRCC) field that indicates the number of logical groups formed in the packet, and a CRCBitmap field which is repeated CRCC times or the number of logical groups formed.

48. The system of claim 47 wherein a CCRC control field is negotiated between the transmitter and the receiver before commencing transmission of packets.

49. The system of claim 47 wherein the CRCBitmap field includes an array of N bits for N bitplanes, per pixel component.

50. The system of claim 47 wherein the MSB of the CRCBitmap corresponds to the MSB bitplane, and zero array entries in the CRCBitmap identify bitplanes that are excluded from the logical group, and thus, excluded from the CRC computation.

51. The system of claim 50 wherein non-zero array entries identify bitplanes that are included in the logical group, and thus, included in the CRC computation.

52. The system of claim 31 wherein the receiver includes:

a communication module configured to receiver packets over a wireless channel;

an error detection module configured to determine corrupted packet information based on the CRC values in a received packet; and

an acknowledgement module configured to generate an ACK frame per packet to indicate the corrupted information to the transmitter;

wherein the communication module of the receiver transmits the ACK frame back to the transmitter.

53. The system of claim 52 wherein:

the communication module of the transmitter is configured to receive an ACK frame from the receiver;

the transmitter further includes a retransmission controller configured such that based on the ACK frame, the retransmission controller generates a retransmit packet including information bits corresponding to those indicated as corrupted in the last packet by the ACK frame; and

the communication module of the transmitter is further configured to selectively retransmit said corresponding bits to the receiver.

54. The system of claim 53 wherein the retransmission controller is configured to generate a retransmit packet including information bits corresponding to those indicated as corrupted in the last packet by the ACK frame, based on human perceptual importance of such data.

55. The system of claim 53 wherein:

the transmitter is configured to receive P ACK frames from the receiver;

the retransmit controller is configured such that based on the P ACK frames the retransmit controller determines the logical groups in that last P packets that need retransmissions; and

the retransmission controller is further configured to retransmit a correct copy of the information bits in the corrupted logical groups from a high priority logical group in perceptual importance, and continue retransmission of other corrupted logical groups in order of priority, without violating the receiver'"'"'s presentation deadline.

56. The system of claim 55 wherein:

the an error detection information generating module is further configured to place a CRC control field in a MAC header of each packet to signal the receiver how the logical groups are formed for CRC error detection at the receiver, the CRC control field including a CRC count (CRCC) field that indicates the number of logical groups formed in the packet, and a CRCBitmap field which is repeated CRCC times or the number of logical groups formed; and

the number of ACK bits is less than or equal to the CRC Count (CRCC) which indicate the number of CRCs, and the error detection module of the receiver is configured to use CRC fields to perform error concealment in the absence of retransmissions.

57. The system of claim 56 wherein the acknowledgment module of the receiver is further configured to generate an ACK frame to indicate the corrupted information for the highest priority logical groups according to perceptual importance.

58. The system of claim 57 wherein the error detection module of the receiver is further configured such that based on the CRC calculations, the error detection module determines if the lowest priority logical groups according to perceptual importance, are correctly received by the receiver, and performs error concealment for the lowest priority logical groups received corrupt at the receiver, in the absence of retransmissions.

59. The system of claim 31 wherein the receiver includes:

a communication module configured to receive a packet at the receiver; and

an error detection module configured such that based on the CRC values in the packet, the error detection module determines the corrupted packet information, and performs error concealment to recover bit errors.

60. The system of claim 31 wherein the transmitter further includes a retransmission controller configured to selectively retransmit to the receiver, bits corresponding to logical groups corrupted in transmission.

61. A wireless transmitter for the transmission of video information including pixels, each pixel including a plurality of components and each component including video information bits, the transmitter comprising:

a logical grouping module configured to logically group the information bits into multiple logical groups in a packet;

a cyclic redundancy code (CRC) module configured to generate error detection information for each logical group in the packet, wherein an error detection information generating module is configured to place the error detection information for each logical group in a corresponding error detection field in the packet; and

a communication module configured to transmit the packet with the error detection information over a wireless channel to a receiver.

62. The transmitter of claim 61 wherein the CRC an error detection information generating is configured to determine error detection information for each logical group by determining a CRC value for the information bits in each logical group.

63. The transmitter of claim 62 wherein the packet includes multiple error detection fields corresponding to the multiple logical groups.

64. The transmitter of claim 61 wherein the logical grouping module is configured to logically group the information bits into multiple logical groups in the packet based on the perceptual importance of the information bits.

65. The transmitter of claim 64 wherein N information bits B₀, . . . , B_N-1 per pixel component are grouped into K logical groups LG₀, . . . , LG_K-1, such that information bits with related perceptual importance are grouped in the same logical group.

66. The transmitter of claim 65 wherein the information bits with the same perceptual importance are grouped into the same logical group.

67. The transmitter of claim 65 wherein the MSBs of the information bits are grouped into one logical group and the LSBs of the information bits are grouped in another logical group.

68. The transmitter of claim 64 wherein each pixel component comprises N bits and the logical grouping module is configured to logically group the information bits into K logical groups such that the information bits with the same perceptual importance are grouped in the same logical group.

69. The transmitter of claim 64 wherein each pixel component comprises N bits ranging from a MSB to a LSB in terms of perceptual importance, and the logical grouping module is configured to logically group the information bits into K logical groups wherein the information bits with the same perceptual importance are grouped in the same logical group.

70. The transmitter of claim 69 wherein each pixel component comprises N bits, B₀, . . . , B_N-1, ranging from a MSB B_N-1 to a LSB B₀ in terms of perceptual importance, and the logical grouping module is further configured to logically group the information bits into K logical groups LG₀, . . . , LG_K-1, wherein K<

N, such that one or more bits of a pixel component are mapped to one logical group.

71. The transmitter of claim 70 wherein N can be one of 8, 10, 12 or 16 bits per pixel component, and K=2 logical groups, wherein pixel component bits from a MSB B_N-1 to a bit B_N/2 are mapped to a first logical group LG₁, and pixel component bits from a bit B_N/2-1 to a LSB B₀ are mapped to second logical group LG₁.

72. The transmitter of claim 70 wherein K=N such that the bits B_N-1 for all pixels in the packet are grouped in logical group LG_N-1, the bits B_N-2 for all pixels in the packet are grouped in logical group LG_N-2, and so on.

73. The transmitter of claim 70 wherein one or more logical groups are protected against channel errors with modulation and coding that according to the perceptual importance of each logical group.

74. The transmitter of claim 70 wherein the CRC an error detection information generating is configured to determine error detection information for each logical group by determining a CRC (Cyclic Redundancy Check) value for the information bits in each logical group.

75. The transmitter of claim 74 wherein coding and modulation for a CRC field match those for the corresponding logical group.

76. The transmitter of claim 74 wherein the communication module is further configured to place a CRC control field in a MAC header of the packet to signal the receiver how the logical groups are formed for CRC error detection at the receiver.

77. The transmitter of claim 76 wherein the CRC control field includes:

a CRC count (CRCC) field that indicates the number of logical groups formed in the packet, and a CRCBitmap field which is repeated CRCC times or the number of logical groups formed.

78. The transmitter of claim 77 wherein the transmitter is configured to negotiate a CCRC control field with the receiver before commencing transmission of packets.

79. The transmitter of claim 77 wherein the CRCBitmap field includes an array of N bits for N bitplanes per pixel component.

80. The transmitter of claim 79 wherein the MSB of the CRCBitmap corresponds to the MSB bitplane, and zero array entries in the CRCBitmap identify bitplanes that are excluded from the logical group, and thus, excluded from the CRC computation.

81. The transmitter of claim 80 wherein non-zero array entries identify the bitplanes that are included in the logical group, and thus, included in the CRC computation.

82. The transmitter of claim 61 wherein:

the communication module of the transmitter is configured to receive an ACK frame per packet from the receiver, each ACK frame including indication of information bits received by the receiver in error;

the transmitter further includes a retransmission controller configured such that based on the ACK frame, the retransmission controller generates a retransmit packet including information bits corresponding to those indicated as corrupted in the last packet by the ACK frame; and

the communication module of the transmitter is further configured to selectively retransmit said corresponding bits to the receiver.

83. The transmitter of claim 82 wherein the retransmission controller is configured to generate a retransmit packet including information bits corresponding to those indicated as corrupted in the last packet by the ACK frame, based on human perceptual importance of such data.

84. The transmitter of claim 82 wherein:

the transmitter is configured to receive P ACK frames from the receiver;

the retransmit controller is configured such that based on the P ACK frames, the retransmit controller determines the logical groups in that last P packets that need retransmissions; and

the retransmission controller is further configured for retransmitting a correct copy of the information bits in the corrupted logical groups from a high priority logical group in perceptual importance, and continuing the retransmitting of other corrupted logical groups in order of priority, without violating the receiver'"'"'s presentation deadline.

85. The transmitter of claim 61 further comprising a retransmission controller configured to selectively retransmit to the receiver, bits corresponding to logical groups corrupted in transmission.

86. A wireless receiver for receiving video information over a wireless channel, comprising:

a communication module configured to receive packets of video information over a wireless channel, each packet including logically grouped video information bits and corresponding CRC (cyclic redundancy check) information for each logical group;

an error detection module configured to determine corrupted packet information based on the CRC information in a received packet; and

an acknowledgement module configured to generate an acknowledgement (ACK) frame per packet to indicate the corrupted information to a transmitter for retransmission of a correct copy of the information bits in the corrupted logical groups from a high priority logical group in perceptual importance;

wherein the communication module of the receiver transmits the ACK frame back to the transmitter.

87. The receiver of claim 86 wherein the error detection module is further configured such that based on the CRC calculations, the error detection module determines if the highest priority logical groups according to perceptual importance, are correctly received by the receiver, and performs error concealment for the lowest priority logical groups received corrupt at the receiver, in the absence of retransmissions.

88. A method for transmission of video information over a wireless channel, comprising:

inputting video pixels, wherein each pixel includes a plurality of components and each component comprises video information bits;

logically grouping the information bits into multiple logical groups in a packet based on the perceptual importance of the information bits, wherein the information bits with a same perceptual importance are grouped in the same logical group;

determining error detection information for each logical group;

placing the error detection information in the packet, wherein placing the error detection information in the packet comprises placing the error detection information for each logical group in a corresponding error detection field in the packet; and

transmitting the packet from a transmitter over a wireless channel to a receiver.

89. A wireless system for transmission of uncompressed video information including pixels, each pixel including a plurality of components and each component including video information bits, the system comprising:

a wireless transmitter; and

a wireless receiver;

wherein the wireless transmitter includes;

a logical grouping module configured to logically group the information bits into multiple logical groups in a packet, wherein the information bits with related perceptual importance are grouped in the same logical group;

an error detection information generating module configured to generate error detection information for each logical group in the packet, wherein the error detection information generating module is configured to place the error detection information for each logical group in a corresponding error detection field in the packet; and

a communication module configured to transmit the packet with the error detection information over a wireless channel to the receiver.