METHOD AND APPARATUS FOR PROVIDING BEAMFORMING FEEDBACK IN WIRELESS COMMUNICATION SYSTEMS
First Claim
1. An apparatus comprising:
- a processor configured to receive a first frame comprising training symbols, to determine amount of time to generate feedback information based on the training symbols in the first frame, and to send a second frame having a length determined based at least on the amount of time to generate the feedback information; and
a memory coupled to the processor.
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Accused Products
Abstract
Techniques for quickly sending feedback information for beamforming are described. A transmitter/initiator sends a first frame comprising training symbols. A receiver/responder receives the first frame, determines the amount of time to generate feedback information, and determines the amount of time to send the feedback information. The receiver then determines the length of a second frame carrying the feedback information based on the amounts of time to generate and send the feedback information. The receiver sends the second frame after waiting a short interframe space (SIFS) period from the end of the first frame, without performing channel access. The receiver generates the feedback information based on the training symbols and sends the information in the second frame when ready. The transmitter receives the second frame, derives at least one steering matrix based on the feedback information, and sends a third frame with the at least one steering matrix.
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Citations
42 Claims
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1. An apparatus comprising:
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a processor configured to receive a first frame comprising training symbols, to determine amount of time to generate feedback information based on the training symbols in the first frame, and to send a second frame having a length determined based at least on the amount of time to generate the feedback information; and
a memory coupled to the processor. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 30)
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15. A method comprising:
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receiving a first frame comprising training symbols;
determining amount of time to generate feedback information based on the training symbols in the first frame; and
sending a second frame having a length determined based at least on the amount of time to generate the feedback information. - View Dependent Claims (16, 17, 18)
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19. An apparatus comprising:
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means for receiving a first frame comprising training symbols;
means for determining amount of time to generate feedback information based on the training symbols in the first frame; and
means for sending a second frame having a length determined based at least on the amount of time to generate the feedback information. - View Dependent Claims (20, 21, 22)
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23. A processor-readable medium including instructions stored thereon, comprising:
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first instructions for receiving a first frame comprising training symbols;
second instructions for determining amount of time to generate feedback information based on the training symbols in the first frame; and
third instructions for sending a second frame having a length determined based at least on the amount of time to generate the feedback information. - View Dependent Claims (24, 25)
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26. An apparatus comprising:
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a processor configured to send a first frame comprising training symbols, to receive a second frame comprising a first portion followed by a second portion, the first portion having a length determined by amount of time to generate feedback information by a receiver of the first frame, the second portion carrying the feedback information, and to derive at least one steering matrix based on the feedback information obtained from the second frame; and
a memory coupled to the processor. - View Dependent Claims (27, 28, 29, 31)
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32. A method comprising:
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sending a first frame comprising training symbols;
receiving a second frame comprising a first portion followed by a second portion, the first portion having a length determined by amount of time to generate feedback information by a receiver of the first frame, the second portion carrying the feedback information; and
deriving at least one steering matrix based on the feedback information obtained from the second frame. - View Dependent Claims (33, 34)
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35. An apparatus comprising:
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means for sending a first frame comprising training symbols;
means for receiving a second frame comprising a first portion followed by a second portion, the first portion having a length determined by amount of time to generate feedback information by a receiver of the first frame, the second portion carrying the feedback information; and
means for deriving at least one steering matrix based on the feedback information obtained from the second frame. - View Dependent Claims (36, 37)
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38. A processor-readable medium including instructions stored thereon, comprising:
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first instructions for sending a first frame comprising training symbols;
second instructions for receiving a second frame comprising a first portion followed by a second portion, the first portion having a length determined by amount of time to generate feedback information by a receiver of the first frame, the second portion carrying the feedback information; and
third instructions for deriving at least one steering matrix based on the feedback information obtained from the second frame.
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39. An apparatus comprising:
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a processor configured to receive a first frame requesting for feedback information for beamforming, to select one of multiple types of preamble, and to send a second frame with a preamble of the selected type and including the feedback information; and
a memory coupled to the processor. - View Dependent Claims (40, 41, 42)
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Specification