METHOD AND APPARATUS OF FIXED SIZE MAC HEADER WITH AN EXTENSION IN WIRELESSHD

• US 20080037540A1
• Filed: 03/23/2007
• Published: 02/14/2008
• Est. Priority Date: 08/09/2006
• Status: Active Grant

• Current Assignee: Samsung Information Systems America Incorporated (Samsung Electronics Co. Ltd.)
• Original Assignee: Samsung Information Systems America Incorporated (Samsung Electronics Co. Ltd.)
• Inventors: Singh, Harkirat, Shao, Huai-Rong, Ngo, Chiu
• Granted Patent: US 8,102,853 B2
• Time in Patent Office: Days
• US Class Current: 370/392
• CPC Class Codes: H04L 1/0041 Arrangements at the transmitter end
• CPC Class Codes: H04L 1/0061 Error detection codes
• CPC Class Codes: H04L 1/0072 Error control for data other than payload data, e.g. control data
• CPC Class Codes: H04L 12/40052 High-speed IEEE 1394 serial bus bus transfer protocol on a daisy chain bus using an embedded synchronisation G06F13/426
• CPC Class Codes: H04L 12/40071 Packet processing; Packet format adaptation of digital video signals for transport over a specific network H04N21/2381, H04N21/4363, H04N21/4381; packet switches H04L49/00; intermediate storage or scheduling H04L49/90
• CPC Class Codes: H04L 12/40117 Interconnection of audio or video/imaging devices home automation networks H04L12/2803; bitstream network arrangements specially adapted for distribution of digital video signals H04N7/24
• CPC Class Codes: H04L 69/324 in the data link layer [OSI layer 2], e.g. HDLC
• CPC Class Codes: H04W 28/06 Optimizing the usage of the radio link, e.g. header compression, information sizing , discarding information system modifying transmission characteristic according to link quality by modifying frame length H04L1/0007; dynamic adaptation of the packet size for flow control or congestion control H04L47/365
• CPC Class Codes: H04W 80/02 Data link layer protocols

Abstract

A data structure of a MAC header for a WirelessHD communication system including an application layer, a media access controller (MAC) layer, and a physical (PHY) layer, includes, a payload data packet from the application layer; a MAC header of a fixed length; a MAC header extension of a variable length; a MAC header extension control field which signals if a particular field needs to be included or excluded; a PHY header for synchronizing the behavior of the PHY layer; a first CRC segment for a cyclic redundancy checksum for checking transmission of the MAC header and the PHY header; and a second CRC segment for a cyclic redundancy checksum for checking transmission of the MAC header extension. Either the MAC header or the MAC header extension includes a size indication of the MAC header extension for facilitating checking of the second CRC segment.

Claims

1. A data structure of a MAC header for a High Definition communication system, using an open systems interconnection (OSI) reference model including an application layer, a media access controller (MAC) layer, and a physical (PHY) layer, the data structure comprising:

a payload data packet received from the application layer;

a MAC header of a fixed length for controlling a plurality of first type of functions of the MAC layer;

a MAC header extension of a variable length for controlling a plurality of second type of functions of the MAC layer;

a PHY header for synchronizing the behavior of the PHY layer;

a first CRC segment for a cyclic redundancy checksum for checking transmission of the MAC header and the PHY header; and

a second CRC segment for a cyclic redundancy checksum for checking transmission of the MAC header extension,

wherein the MAC header comprises a size indication of the MAC header extension, the size indication referred in facilitating checking of the second CRC segment.

2. The data structure of claim 1, wherein the first type of functions perform processes comprising:

controlling the MAC layer;

controlling the MAC header extension;

indicating a destination device of the payload data packet;

indicating a source device of the payload data packet;

identifying a wireless video audio network to which the destination and source devices belong;

identifying the type of the data packet; and

indexing the data packet.

3. The data structure of claim 2, wherein the MAC header comprises:

a MAC control field for controlling the MAC layer;

a MAC header extension control field for controlling the MAC header extension;

a destination ID field for indicating a destination device of the payload data packet;

a source ID field for indicating a source device which provided the payload data packet;

a wireless video audio network ID field for identifying a wireless video audio network to which the destination and source devices belong;

a stream index field for identifying the type of the data packet; and

a sequence number field provided by a modulo-counter for indexing the data packet.

4. The data structure of claim 3, wherein the MAC control field comprises:

a protocol version field for indicating a version of a protocol used for the data packet;

a packet type field for indicating a type of the data packet;

an ACK policy field for indicating an ACK policy;

a security bit for indicating secure data packets;

a retry bit for indicating if the packet is either a data packet or MAC command and if the packet is retransmitted;

a more-data bit for indicating whether the device will be sending any more packets in the reserved time block; and

a transport priority field for indicating the priority of the packet.

5. The data structure of claim 3, wherein the MAC header extension control field comprises:

an MAC header extension length field for indicating the length of the MAC header extension;

a link adaptation extension bit;

a ReBoM (reliable broadcast or multicast) control bit; and

a composite frame control bit.

6. The data structure of claim 3, wherein the modulo counter comprises a modulo 256 counter, and wherein the sequence number is incremented for each packet sent.

7. The data structure of claim 1, wherein the first CRC segment is set by CRC-16 or CRC-32 defined in IEEE 802.11 standard.

8. The data structure of claim 1, wherein the second type of function comprises device-dependent functions and application-dependent functions.

9. The data structure of claim 8, wherein the MAC header extension comprises a ReBoM header, a Link adaptation extension header, and a composite frame header, and wherein presence or absence of the ReBoM header, the Link adaptation extension header, and the composite frame header are determined by values of the corresponding MAC header extension control bits.

10. A method of communicating payload data in a High Definition communication system using an OSI model including an application layer, a MAC layer, and a PHY layer, the method comprising:

receiving payload data comprising uncompressed video data from the application layer;

encapsulating at least a portion of the payload data with a MAC header of a fixed size, a MAC header extension of a variable size, a first checking data segment, and a second checking data segment to produce MAC Protocol Data Unit (MPDU);

appending a synchronization header (PHY header) for a PHY layer to the MPDU; and

transmitting the PHY header appended MPDU to a receiver.

11. The method of claim 10, wherein the first checking data segment comprises a first cyclic redundancy checksum (first CRC) for the PHY header and the MAC header, wherein the second checking data segment comprises a second cyclic redundancy checksum (second CRC) for the MAC header extension, wherein the PHY header and the MAC header for which the first CRC is computed is of a fixed size, and wherein the MAC header comprises a size indication of the MAC header extension which facilitates calculating of the second CRC.

12. The method of claim 10, wherein the MAC header extension comprises device-dependent fields and application-dependent fields.

13. The method of claim 12, wherein the MAC header extension further comprises a ReBoM header, a Link adaptation extension header, and a composite frame header, and wherein presence or absence of the ReBoM header, the Link adaptation extension header, and the composite frame header is determined by values of corresponding MAC header extension control bits in the MAC header.

14. The method of claim 10, further comprising:

generating a first cyclic redundancy checksum for the PHY header and the MAC header at the receiver;

generating a second cyclic redundancy checksum for the MAC header extension at the receiver; and

determining whether the act of transmitting is successful by comparing the computed first and second cyclic redundancy checksum with the received first and second cyclic redundancy checksum.

15. The method of claim 14, wherein the act of computing the second cyclic redundancy checksum comprises using the size indication of the MAC header extension extracted from the MAC header extension.

16. The method of claim 14, wherein the act of determining comprises determining the act of transmitting is successful when the computed first cyclic redundancy checksum is matched with the received first cyclic redundancy checksum.

17. The method of claim 10, wherein the first CRC segment is computed by using CRC-16 or CRC-32 defined in IEEE 802.11 standard.

18. The method of claim 10, wherein the MAC header extension further comprises device-dependent fields and application-dependent fields.

19. The method of claim 18, wherein the MAC header extension comprises a ReBoM header, a Link adaptation extension header, and a composite frame header, and wherein presence or absence of the ReBoM header, the adaptation extension header, and the composite frame header are determined by values of the corresponding MAC header extension control bits.

20. A system for communicating payload data in a High Definition communication system using an OSI model including an application layer, a MAC layer, and a PHY layer, comprising:

means for receiving payload data comprising uncompressed video data from the application layer;

means for encapsulating at least a portion of the payload with a MAC header of a fixed size, a MAC header extension of a variable size, a first checking data segment, and a second checking data segment to produce MAC Packet Data Unit (MPDU);

means for appending a synchronization header (PHY header) for a PHY layer to the MPDU; and

means for transmitting the PHY header appended MPDU to a receiver.

21. The system of claim 20, wherein the first checking data segment comprises a first cyclic redundancy checksum (first CRC) for the PHY header and the MAC header, wherein the second checking data segment comprises a second cyclic redundancy checksum (second CRC) for the MAC header extension, wherein the PHY header and the MAC header for which the first CRC is computed is of fixed size, and wherein the MAC header comprises a size indication of the MAC header extension which facilitates calculating of the second CRC.

22. The system of claim 20, wherein the MAC header extension comprises device-dependent fields and application-dependent fields.

23. The system of claim 22, wherein the MAC header extension further comprises a ReBoM header, a Link adaptation extension header, and a composite frame header, and wherein presence or absence of the ReBoM header, the adaptation extension header, and the composite frame header is determined by values of corresponding MAC header extension control bits in the MAC header.

24. The system of claim 20, further comprising:

means for generating a first cyclic redundancy checksum for the PHY header and the MAC header at the receiver;

means for generating a second cyclic redundancy checksum for the MAC header extension at the receiver; and

means for determining whether the transmission is successful by comparing the computed first and second cyclic redundancy checksum with the received first and second cyclic redundancy checksum.

25. The system of claim 24, wherein the means for computing the second cyclic redundancy checksum comprises a means for using the size indication of the MAC header extension extracted from the MAC header.

26. The system of claim 20, wherein the first CRC segment is computed by using CRC-16 or CRC-32 defined in IEEE 802.11 standard.

27. A data structure of a MAC header for a High Definition communication system, using an OSI model including an application layer, a MAC layer, and a PHY layer, comprising:

a payload data packet from the application layer;

a MAC header of a fixed length;

a MAC header extension of a variable length;

a PHY header for synchronizing the behavior of the PHY layer;

a first CRC segment for a cyclic redundancy checksum for checking transmission of the MAC header and the PHY header; and

a second CRC segment for a cyclic redundancy checksum for checking transmission of the MAC header extension,

wherein the MAC header extension comprises a size indication of the MAC header extension for facilitating checking of the second CRC segment.

28. The data structure of claim 27, wherein the MAC header comprises:

a MAC control field for controlling the MAC layer;

a MAC header extension control field for controlling the MAC header extension;

a destination ID field for indicating a destination device of the payload data packet;

a source ID field for indicating a source device of the payload data packet;

a wireless video audio network ID field for identifying a wireless video audio network to which the destination and source devices belong;

a stream index field for identifying the type of the data packet; and

a sequence number field provided by a modulo-counter for indexing the data packet.

29. The data structure of claim 28, wherein the MAC header extension control field comprises:

an MAC header extension length field for indicating the length of the MAC header extension;

a link adaptation extension bit;

a ReBoM (reliable broadcast or multicast) control bit; and

a composite frame control bit.

30. The data structure of claim 29, wherein the MAC header extension comprises a ReBoM header, an adaptation extension header, and a composite frame header, and wherein presence or absence of the ReBoM header, the adaptation extension header, and the composite frame header are determined by values of the corresponding MAC header extension control bits.

31. The data structure of claim 30, wherein the composite frame header is of a variable length, and wherein if the composite frame control bit is set, the composite frame header is included in the MAC header extension and a size indication of the MAC header extension is included in the MAC header extension.

32. A data structure of a MAC header for a High Definition communication system, using an open systems interconnection (OSI) reference model including an application layer, a media access controller (MAC) layer, and a physical (PHY) layer, the data structure comprising:

a payload data packet received from the application layer;

a MAC header of a fixed length for controlling a plurality of first type of functions of the MAC layer;

a MAC header extension of a variable length for controlling a plurality of second type of functions of the MAC layer;

a PHY header for synchronizing the behavior of the PHY layer; and

a CRC segment for a cyclic redundancy checksum for checking transmission of the MAC header, the PHY header, and the MAC header extension,

wherein the MAC header comprises a size indication of the MAC header extension.

33. The data structure of claim 32, wherein the payload data packet comprises a separate CRC segment for cyclic redundancy checksum for checking transmission of the rest of the payload data packet.