METHODS AND APPARATUS FOR MODULATION CODING SCHEME SELECTION FOR RESPONSE FRAMES

• US 20150124786A1
• Filed: 11/05/2014
• Published: 05/07/2015
• Est. Priority Date: 11/06/2013
• Status: Abandoned Application

• Current Assignee: Qualcomm, Inc.
• Original Assignee: Qualcomm, Inc.
• Inventors: Asterjadhi, Alfred, Jafarian, Amin, Merlin, Simone
• Application Number:
  US14/533,403
• Publication Number:
  US 20150124786A1
• Time in Patent Office: Days
• US Class Current: 370/336
• 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 1/0018 based on latency requirement
• CPC Class Codes: H04L 1/0023 characterised by the signalling
• CPC Class Codes: H04L 1/1614 using bitmaps
• CPC Class Codes: H04W 28/18 Negotiating wireless communication parameters
• CPC Class Codes: H04W 72/0446 Resources in time domain, e.g. slots or frames

Abstract

Certain aspects of the present disclosure relate to a methods and apparatus for selecting modulation coding schemes (MCS). In one aspect, a method for wireless communication includes processing a message identifying a duration constraint for a response message. The method further includes selecting one or more parameters for transmission of the response message based at least in part on the duration constraint.

Claims

1. An apparatus for wireless communication, comprising:

a processing system configured to;

decode a first message identifying a duration constraint for a response message; and

select one or more parameters for transmission of the response message based at least in part on the duration constraint; and

an interface configured to provide the response message for transmission using the selected one or more parameters over the duration constraint.

2. The apparatus of claim 1, wherein the selection comprises selecting a modulation coding scheme and a number of spatial streams such that a duration to transmit the response message is less than or equal to a duration of the duration constraint.

3. The apparatus of claim 1, wherein the first message comprises an indication of a length of the response message, wherein the selection is based at least in part on the length of the response message.

4. The apparatus of claim 1, wherein the selection comprises:

determining a modulation coding scheme and a number of spatial streams of the first message;

determining an allowable set of modulation coding schemes and number of spatial streams for the response message based at least in part on the determined modulation coding scheme and the determined number of spatial streams of the first message; and

selecting from the allowable set the modulation coding scheme and the number of spatial streams for the response message such that a duration to transmit the response message is less than or equal to a duration of the duration constraint.

5. The apparatus of claim 4, wherein determining the modulation coding scheme and the number of spatial streams of the first message comprises extracting a modulation coding scheme and a number of spatial streams from a field in the first message.

6. The apparatus of claim 4, wherein the allowable set of modulation coding schemes and number of spatial streams for the response message is defined based on the modulation coding scheme and the number of spatial streams of the first message.

7. The apparatus of claim 1, wherein the selection comprises:

determining a modulation coding scheme and a number of spatial streams of a message previously transmitted by the apparatus;

determining an allowable set of modulation coding schemes and number of spatial streams for the response message based at least in part on the modulation coding scheme and the number of spatial streams of the message previously transmitted by the apparatus; and

selecting from the allowable set the modulation coding scheme and the number of spatial streams for the response message such that a duration to transmit the response message is less than or equal to a duration of the duration constraint.

8. The apparatus of claim 7, wherein determining the modulation coding scheme and the number of spatial streams of the message previously transmitted by the apparatus comprises extracting a modulation coding scheme and a number of spatial streams from a field in the message previously transmitted by the apparatus.

9. The apparatus of claim 7, wherein the allowable set of modulation coding schemes and number of spatial streams for the response message is defined based on the modulation coding scheme and the number of spatial streams of the message previously transmitted by the apparatus.

10. The apparatus of claim 10, wherein the selected one or more parameters comprise a modulation coding scheme and a number of spatial streams.

11. A method for wireless communication, comprising:

processing a first message identifying a duration constraint for a response message; and

selecting one or more parameters for transmission of the response message based at least in part on the duration constraint.

12. The method of claim 11, wherein selecting the one or more parameters comprises selecting a modulation coding scheme and a number of spatial streams such that a duration to transmit the response message is less than or equal to a duration of the duration constraint.

13. The method of claim 11, wherein the first message comprises an indication of a length of the response message, wherein selecting the one or more parameters comprises selecting the one or more parameters based at least in part on the length of the response message.

14. The method of claim 11, wherein selecting the one or more parameters comprises:

determining a modulation coding scheme and a number of spatial streams of the first message;

determining an allowable set of modulation coding schemes and number of spatial streams for the response message based at least in part on the determined modulation coding scheme and the determined number of spatial streams of the first message; and

selecting from the allowable set the modulation coding scheme and the number of spatial streams for the response message such that a duration to transmit the response message is less than or equal to a duration of the duration constraint.

15. The method of claim 14, wherein determining the modulation coding scheme and the number of spatial streams of the first message comprises extracting a modulation coding scheme and a number of spatial streams from a field in the first message.

16. The method of claim 14, wherein the allowable set of modulation coding schemes and number of spatial streams for the response message is defined based on the modulation coding scheme and the number of spatial streams of the first message.

17. The method of claim 11, wherein selecting the one or more parameters comprises:

determining a modulation coding scheme and a number of spatial streams of a message previously transmitted by the apparatus;

determining an allowable set of modulation coding schemes and number of spatial streams for the response message based at least in part on the modulation coding scheme and the number of spatial streams of the message previously transmitted by the apparatus; and

selecting from the allowable set the modulation coding scheme and the number of spatial streams for the response message such that a duration to transmit the response message is less than or equal to a duration of the duration constraint.

18. The method of claim 17, wherein determining the modulation coding scheme and the number of spatial streams of the message previously transmitted by the apparatus comprises extracting a modulation coding scheme and a number of spatial streams from a field in the message previously transmitted by the apparatus.

19. The method of claim 17, wherein the allowable set of modulation coding schemes and number of spatial streams for the response message is defined based on the modulation coding scheme and the number of spatial streams of the message previously transmitted by the apparatus.

20. The method of claim 11, further comprising transmitting the response message using the selected one or more parameters over the duration constraint.

21. An apparatus for wireless communication, comprising:

means for decoding a first message identifying a duration constraint for a response message; and

means for selecting one or more parameters for transmission of the response message based at least in part on the duration constraint.

22. The apparatus of claim 21, wherein the selecting means comprises means for selecting a modulation coding scheme and a number of spatial streams such that a duration to transmit the response message is less than or equal to a duration of the duration constraint.

23. The apparatus of claim 21, wherein the first message comprises an indication of a length of the response message, wherein the selecting means comprises means for selecting the one or more parameters based at least in part on the length of the response message.

24. The apparatus of claim 21, wherein the selecting means comprises:

means for determining a modulation coding scheme and a number of spatial streams of the first message;

means for determining an allowable set of modulation coding schemes and number of spatial streams for the response message based at least in part on the modulation coding scheme and the number of spatial streams of the first message; and

means for selecting from the allowable set the modulation coding scheme and the number of spatial streams for the response message such that a duration to transmit the response message is less than or equal to a duration of the duration constraint.

25. The apparatus of claim 24, wherein means for determining the modulation coding scheme and the number of spatial streams of the first message comprises means for extracting a modulation coding scheme and a number of spatial streams from a field in the first message.

26. The apparatus of claim 24, wherein the allowable set of modulation coding schemes and number of spatial streams for the response message is defined based on the modulation coding scheme and the number of spatial streams of the first message.

27. The apparatus of claim 21, wherein the selecting means comprises:

means for determining a modulation coding scheme and a number of spatial streams of a message previously transmitted by the apparatus;

means for determining an allowable set of modulation coding schemes and number of spatial streams for the response message based at least in part on the modulation coding scheme and the number of spatial streams of the message previously transmitted by the apparatus; and

means for selecting from the allowable set the modulation coding scheme and the number of spatial streams for the response message such that a duration to transmit the response message is less than or equal to a duration of the duration constraint.

28. The apparatus of claim 27, wherein means for determining the modulation coding scheme and the number of spatial streams of the message previously transmitted by the apparatus comprises means for extracting a modulation coding scheme and a number of spatial streams from a field in the message previously transmitted by the apparatus.

29. The apparatus of claim 27, wherein the allowable set of modulation coding schemes and number of spatial streams for the response message is defined based on the MCS and number of spatial streams of the message previously transmitted by the apparatus.

30. A wireless node for wireless communication, comprising:

an antenna;

a processing system configured to;

decode a first message received via the antenna identifying a duration constraint for a response message; and

select one or more parameters for transmission of the response message based at least in part on the duration constraint.