Wireless HD MAC frame format

• US 9,065,682 B2
• Filed: 10/31/2007
• Issued: 06/23/2015
• Est. Priority Date: 11/01/2006
• Status: Active Grant

• Current Assignee: Qualcomm, Inc.
• Original Assignee: Silicon Image, Inc. (Lattice Semiconductor Corporation)
• Inventors: Mahesh, Kumar, Krishnaswami, Karthik, Wang, Karen, Gilbert, Jeffrey M., Shung, Chuen-Shen
• Primary Examiner(s): RENNER, BRANDON M
• Application Number:
  US11/981,935
• Publication Number:
  US 20080192726A1
• Time in Patent Office: 2,792 Days
• Field of Search: 370312-342
• US Class Current: 1/1
• CPC Class Codes: H04L 12/6418 Hybrid transport
• CPC Class Codes: H04L 2012/6448 Medium Access Control [MAC]
• CPC Class Codes: H04L 65/70 Media network packetisation

Abstract

A media access controller (MAC) generates a composite packet having an optimized format for carrying audio, video, and data traffic. A header portion of the composite packet is encoded separately from a data portion of the composite packet. A physical device interface (PHY) is coupled to the MAC. The PHY encodes and decodes between a digital signal and a modulated analog signal. The PHY comprises a high rate physical layer circuit (HRP) and a low rate physical layer circuit (LRP). A radio frequency (RF) transmitter is coupled to the PHY to transmit data.

Claims

1. An apparatus comprising:

a media access controller (MAC) for generating a composite packet having a format configurable to carry one or more of audio, video and data traffic, a header portion of the composite packet encoded separately from a data portion of the composite packet, wherein the composite packet includes a plurality of sub-packets each sharing a common MAC header and a PHY header, wherein at least a first sub-packet of the plurality of sub-packets in the composite packet is encoded according to a first Modulation Coding Scheme (MCS) that encodes the first sub-packet according to a first data rate and a first level of robustness, and wherein at least a second sub-packet of the plurality of sub-packets in the composite packet is encoded according to a second MCS different than the first MCS, the second MCS encoding the second sub-packet according to second data rate lower than the first data rate and a second level of robustness higher than the first level of robustness;

a physical device interface (PHY) coupled to the MAC, the PHY to encode and decode between a digital signal and a modulated analog signal, the PHY comprising a high rate physical layer circuit (HRP) and a low rate physical layer circuit (LRP), wherein the HRP supports a data rate greater than or equal to one gigabit per second and the LRP supports a data rate less than one gigabit per second; and

a radio frequency (RF) transmitter coupled to the PHY to transmit data.

2. The apparatus of claim 1 wherein the composite packet includes up to seven sub-packets.

3. The apparatus of claim 2 wherein the composite packet includes four video sub-packets, one audio sub-packet, one data sub-packet, and one control subpacket.

4. The apparatus of claim 2 wherein the composite packet includes up to four video sub-packets.

5. The apparatus of claim 2 wherein a PHY header of each subpacket includes an MSC field, and a length field, wherein a MAC Ext Header of each sub-packet includes a type of sub-packet field and an ACK field.

6. The apparatus of claim 2 wherein the first and second levels of robustness are based on an error tolerance of the type of traffic.

7. The apparatus of claim 1 wherein the media access controller furthermore selects one of the first MCS or second MCS to apply based on an identified type of sub-packet, wherein the media access controller applies the first MCS to video traffic, and wherein the media access controller applies the second MCS to audio, data, and control traffic.

8. The apparatus of claim 1 wherein the composite packet includes ACK group bits for at least all but one of the sub-packets, the ACK group bits determining which sub-packets are combined into returned ACK bits.

9. The apparatus of claim 1 wherein the acknowledgement to the composite packet includes one ACK bit for each video sub-packet, and one ACK bit for audio, data, or control sub-packets.

10. The apparatus of claim 1 wherein the composite packet includes a sub-payload field comprising a length field, a sequence number field, a first fragment field, a last fragment field, and a MAC service data unit (MSDU) field.

11. The apparatus of claim 1 wherein the composite packet is transmitted using an Inter Packet Period (IPP) to determine the start of subpackets within a multi-packet Channel Time Block (CTB), the IPP determined as IPP=Packet Duration+ACK duration+2*Short Interframe Space (SIFS) Duration.

12. The apparatus of claim 1 wherein the composite packet includes a beacon packet with a beacon duration extended at the expense of a Random Access Time Block (RATB).

13. The apparatus of claim 1 wherein the composite packet includes up to seven sub-packets per packet, each sub-packet having its own type information, each sub-packet having its own CRC.

14. The apparatus of claim 1 wherein the composite packet includes up to seven sub-packets grouped into up to five ACK groups, each ACK group is only acknowledged if all CRCs in the group pass.

15. The apparatus of claim 1 wherein data delivery is coordinated between a transmitter and a receiver, the receiver knowing when the transmitter is sending data packets versus beam search packets based on a boundary of a packet.

16. The apparatus of claim 1 wherein the composite packet includes a Long Omni low rate physical layer data unit (LRPDU) format used for beacons and unscheduled packets and a Short Omni LRPDU format used for contention period and scheduled packets.

17. A method comprising:

generating a composite packet with a wireless HD MAC frame format configurable to carry audio, video, and data traffic;

encoding a header portion of the composite packet separately from a data portion of the composite packet,

wherein the composite packet includes four video sub-packets, one audio subpacket one data sub-packet, and one control sub-packet, each of the sub-packets sharing a common MAC header and a PHY header, at least a first sub-packet of the plurality of sub-packets in the composite packet is encoded according to a different Modulation Coding Scheme (MCS) that encodes the first sub-packet according to a first data rate and a first level of robustness, and wherein at least a second sub-packet of the plurality of sub-packets in the composite packet is encoded according to a second MCS different than the first MCS, the second MCS encoding the second sub-packet according to a second data rate lower than the first data rate and a second level of robustness higher than the first level of robustness.

18. The method of claim 17 further comprising:

transmitting video traffic with faster and less robust MCS; and

transmitting audio, data, or control traffic with slower and more robust MCS.

19. The method of claim 17 wherein the acknowledgement to the composite packet includes one ACK bit for each video sub-packet, and one ACK bit for audio, data, and control sub-packets.

20. The method of claim 17 wherein the composite packet includes a sub-payload field comprising a length field, a sequence number field, a first fragment field, a last fragment field, and a MAC service data unit (MSDU) field.

21. The method of claim 17 wherein the composite packet is transmitted using an Inter Packet Period (IPP) to determine the start of sub-packets within a multi-packet Channel Time Block (CTB), the IPP determined as IPP=Packet Duration+ACK duration+2*Short Interframe Space (SIFS) Duration.

22. The method of claim 17 wherein the composite packet includes up to seven sub-packets per packet, each sub-packet having its own type information, each sub-packet having its own CRC.

23. The method of claim 17 wherein the composite packet includes up to seven sub-packets grouped into up to five ACK groups, each ACK group is only acknowledged if all CRCs in the group pass.