Techniques for explicit feedback delay measurement
First Claim
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1. A method for communicating in a wireless local area network (WLAN) network, the method comprising:
- sending, by a beamformer, a feedback request to a beamformee over a wireless channel;
receiving a feedback response from the beamformee, the feedback response including indicia for the beamformer to form or modify a beam with the beamformee, wherein the indicia was identified by the beamformee based on channel characteristics of the feedback request, the feedback response including a timestamp of when the feedback request arrived at the beamformee;
determining a time delay as an interval between a time of arrival of the feedback response minus the timestamp; and
when the determined time delay is within a channel coherence time, beamforming a data signal to the beamformee using beamforming coefficients based on indicia in the feedback response;
otherwise disregarding the feedback response.
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Abstract
Techniques for explicit feedback delay measurement are described. An apparatus may comprise a processor to generate a steering matrix for transmit spatial processing over a channel, determine a delay time associated with explicit feedback information for the channel, and determine whether to modify the steering matrix with the explicit feedback information based on the delay time. Other embodiments are described and claimed.
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Citations
25 Claims
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1. A method for communicating in a wireless local area network (WLAN) network, the method comprising:
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sending, by a beamformer, a feedback request to a beamformee over a wireless channel; receiving a feedback response from the beamformee, the feedback response including indicia for the beamformer to form or modify a beam with the beamformee, wherein the indicia was identified by the beamformee based on channel characteristics of the feedback request, the feedback response including a timestamp of when the feedback request arrived at the beamformee; determining a time delay as an interval between a time of arrival of the feedback response minus the timestamp; and when the determined time delay is within a channel coherence time, beamforming a data signal to the beamformee using beamforming coefficients based on indicia in the feedback response;
otherwise disregarding the feedback response. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
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9. An apparatus for communicating in a wireless local area network (WLAN), the apparatus comprising:
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a processor circuit configured to generate a beamforming feedback request to be sent to a beamformee over a wireless channel, to process a received feedback response including indicia for the apparatus to form or modify a beam with the beamformee, the indicia identified by the beamformee based on channel characteristics of the feedback request, the feedback response including a timestamp of when the feedback request arrived at the beamformee;
the processor circuit further configured to determine a time delay as an interval between a time of arrival of the feedback response minus the timestamp; andwhen the determined time delay is within a channel coherence time, the processor circuit to beamform a data signal to the beamformee using beamforming coefficients based on indicia in the feedback response;
otherwise disregard the feedback response. - View Dependent Claims (10, 11, 12, 13, 14, 15, 16, 17)
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18. A system for communications in a wireless network, the system comprising:
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an antenna array; a transceiver coupled to the antenna array; and a processor coupled to the transceiver to generate a beamforming feedback request to be sent to a beamformee over a wireless channel from the transceiver, to process a feedback response received by the transceiver from the beamformee, the feedback response including indicia for the system to form or modify a beam with the beamformee, the indicia identified by the beamformee based on channel characteristics of the feedback request, the feedback response including a timestamp of when the feedback request arrived at the beamformee;
the processor further configured to determine a time delay as an interval between a time of arrival of the feedback response minus the timestamp; and
wherein when the determined time delay is within a channel coherence time, the processor to activate the transceiver to beamform a data signal to the beamformee using beamforming coefficients based on indicia in the feedback response;
otherwise disregard the feedback response. - View Dependent Claims (19, 20, 21, 22, 23, 24, 25)
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Specification