LEGACY-COMPATIBLE CONTROL FRAMES

• US 20120250617A1
• Filed: 09/26/2011
• Published: 10/04/2012
• Est. Priority Date: 10/01/2010
• Status: Active Grant

• Current Assignee: Qualcomm, Inc.
• Original Assignee: Qualcomm, Inc.
• Inventors: Wentink, Maarten Menzo
• Granted Patent: US 9,998,571 B2
• Time in Patent Office: Days
• US Class Current: 370/328
• CPC Class Codes: H04L 2101/622 Layer-2 addresses, e.g. medium access control [MAC] addresses
• CPC Class Codes: H04L 69/22 Parsing or analysis of headers
• CPC Class Codes: H04W 72/20 Control channels or signalling for resource management
• CPC Class Codes: H04W 74/0808 using carrier sensing, e.g. carrier sense multiple access [CSMA]
• CPC Class Codes: H04W 8/26 Network addressing or numbering for mobility support
• CPC Class Codes: H04W 80/02 Data link layer protocols

Abstract

Certain aspects of the present disclosure provide techniques and apparatus for using different MAC addresses in frames for the same station to indicate how to process the frames. In this manner, frames for IEEE 802.11ac can carry information not present in legacy frames (e.g., frames according to IEEE 802.11a/n), but these frames may be interpreted by legacy devices in a legacy way. One example method generally includes receiving a first frame comprising an indication of a first MAC address and processing the received first frame based on the first MAC address. For certain aspects, the method further includes receiving a second frame comprising an indication of a second MAC address, wherein the second MAC address is different than the first address; and processing the received second frame based on the second MAC address, such that the processing of the second frame is different than the processing of the first frame.

Claims

1. An apparatus for wireless communications, comprising:

a receiver configured to receive a first frame comprising an indication of a first Media Access Control (MAC) address; and

a processing system configured to parse the received first frame based on the first MAC address.

2. The apparatus of claim 1, wherein the processing system is configured to parse the received first frame by interpreting the first frame as a legacy frame or as a very high throughput (VHT) frame, based on the first MAC address.

3. The apparatus of claim 1, wherein the processing system is configured to parse the received first frame by extracting, from the first frame, information supported by the Institute of Electrical and Electronics Engineers (IEEE) 802.11ac amendment or later amendments to the IEEE 802.11 standard.

4. The apparatus of claim 1, wherein the processing system is configured to parse the received first frame by extracting, from the first frame, information about one or more channels on which the first frame was sent.

5. The apparatus of claim 4, wherein the information is indicated by two or more least significant bits (LSBs) of a Duration field of the first frame.

6. The apparatus of claim 1, wherein the receiver is configured to receive a second frame comprising an indication of a second MAC address, wherein the second MAC address is different than the first MAC address, and wherein the processing system is configured to parse the received second frame based on the second MAC address, such that parsing of the second frame is different than parsing of the first frame.

7. The apparatus of claim 6, wherein the processing system is configured to parse the second frame by parsing the second frame based on the Institute of Electrical and Electronics Engineers (IEEE) 802.11a amendment or the 802.11n amendment to the IEEE 802.11 standard.

8. The apparatus of claim 6, wherein the first frame comprises a control frame.

9. The apparatus of claim 8, further comprising a transmitter, wherein the control frame comprises a Request to Send (RTS) frame, wherein the transmitter is configured to transmit, to another apparatus, a Clear to Send (CTS) frame in response to the received RTS frame, and wherein the second frame comprises a data frame sent by the other apparatus in response to the CTS frame.

10. The apparatus of claim 6, wherein the first MAC address differs from the second MAC address by only one address bit.

11. The apparatus of claim 10, wherein the one address bit comprises an Individual/Group (I/G) address bit, a Universally/Locally (U/L) Administered address bit, or a least significant address bit.

12. The apparatus of claim 1, wherein the receiver is configured to receive a management frame notifying the apparatus that frames comprising the indication of the first MAC address are intended for the apparatus.

13. A method for wireless communications, comprising:

receiving, at an apparatus, a first frame comprising an indication of a first Media Access Control (MAC) address; and

parsing the received first frame based on the first MAC address.

14. The method of claim 13, wherein parsing the received first frame comprises interpreting the first frame as a legacy frame or as a very high throughput (VHT) frame, based on the first MAC address.

15. The method of claim 13, wherein parsing the received first frame comprises extracting, from the first frame, information supported by the Institute of Electrical and Electronics Engineers (IEEE) 802.11ac amendment or later amendments to the IEEE 802.11 standard.

16. The method of claim 13, wherein parsing the received first frame comprises extracting, from the first frame, information about one or more channels on which the first frame was sent.

17. The method of claim 16, wherein the information is indicated by two or more least significant bits (LSBs) of a Duration field of the first frame.

18. The method of claim 13, further comprising:

receiving a second frame comprising an indication of a second MAC address, wherein the second MAC address is different than the first MAC address; and

parsing the received second frame based on the second MAC address, such that the parsing of the second frame is different than the parsing of the first frame.

19. The method of claim 18, wherein parsing the second frame comprises parsing the second frame based on the Institute of Electrical and Electronics Engineers (IEEE) 802.11a amendment or the 802.11n amendment to the IEEE 802.11 standard.

20. The method of claim 18, wherein the first frame comprises a control frame.

21. The method of claim 20, further comprising transmitting, to another apparatus, a Clear to Send (CTS) frame in response to the received control frame, wherein the control frame comprises a Request to Send (RTS) frame and wherein the second frame comprises a data frame sent by the other apparatus in response to the CTS frame.

22. The method of claim 18, wherein the first MAC address differs from the second MAC address by only one address bit.

23. The method of claim 22, wherein the one address bit comprises an Individual/Group (I/G) address bit, a Universally/Locally (U/L) Administered address bit, or a least significant address bit.

24. The method of claim 13, further comprising receiving a management frame notifying the apparatus that frames comprising the indication of the first MAC address are intended for the apparatus.

25. An apparatus for wireless communications, comprising:

means for receiving a first frame comprising an indication of a first Media Access Control (MAC) address; and

means for parsing the received first frame based on the first MAC address.

26. The apparatus of claim 25, wherein the means for parsing the received first frame is configured to interpret the first frame as a legacy frame or as a very high throughput (VHT) frame, based on the first MAC address.

27. The apparatus of claim 25, wherein the means for parsing is configured to parse the received first frame by extracting, from the first frame, information supported by the Institute of Electrical and Electronics Engineers (IEEE) 802.11ac amendment or later amendments to the IEEE 802.11 standard.

28. The apparatus of claim 25, wherein the means for parsing is configured to parse the received first frame by extracting, from the first frame, information about one or more channels on which the first frame was sent.

29. The apparatus of claim 28, wherein the information is indicated by two or more least significant bits (LSBs) of a Duration field of the first frame.

30. The apparatus of claim 25, wherein the means for receiving is configured to receive a second frame comprising an indication of a second MAC address, wherein the second MAC address is different than the first MAC address, and wherein the means for parsing is configured to parse the received second frame based on the second MAC address, such that the parsing of the second frame is different than the parsing of the first frame.

31. The apparatus of claim 30, wherein the means for parsing is configured to parse the second frame by parsing the second frame based on the Institute of Electrical and Electronics Engineers (IEEE) 802.11a amendment or the 802.11n amendment to the IEEE 802.11 standard.

32. The apparatus of claim 30, wherein the first frame comprises a control frame.

33. The apparatus of claim 32, further comprising a means for transmitting, wherein the control frame comprises a Request to Send (RTS) frame, wherein the means for transmitting is configured to transmit, to another apparatus, a Clear to Send (CTS) frame in response to the received RTS frame, and wherein the second frame comprises a data frame sent by the other apparatus in response to the CTS frame.

34. The apparatus of claim 30, wherein the first MAC address differs from the second MAC address by only one address bit.

35. The apparatus of claim 34, wherein the one address bit comprises an Individual/Group (I/G) address bit, a Universally/Locally (U/L) Administered address bit, or a least significant address bit.

36. The apparatus of claim 25, wherein the means for receiving is configured to receive a management frame notifying the apparatus that frames comprising the indication of the first MAC address are intended for the apparatus.

37. A computer-program product for wireless communications, comprising a computer-readable medium comprising instructions executable to:

receive, at an apparatus, a frame comprising an indication of a Media Access Control (MAC) address; and

parse the received frame based on the MAC address.

38. A wireless node, comprising:

at least one antenna;

a receiver configured to receive, via the at least one antenna, a frame comprising an indication of a Media Access Control (MAC) address; and

a processing system configured to parse the received frame based on the MAC address.