System and method for information verification based on channel awareness
First Claim
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1. A client device for communicating with a wireless access point, the client device comprising:
- a data processing module having a processor and memory configured to receive at least a portion of a frame transmitted by the access point to an intermediate location within the frame; and
a channel assessment module having a processor and memory configured to determine a validity window with respect to the intermediate location when at least one channel quality metric is greater than or equal to a given threshold, wherein the data processing module is configured to validate information received within the validity window;
wherein the channel quality metric comprises confidence metrics from the output of a Viterbi decoder; and
wherein the frame is received though a verification field and the channel assessment module is further configured to diagnose a failure of the verification field on the basis of a duration metric and a difference between a first channel quality metric measured during a preamble of the frame and a second channel quality metric measured during a time corresponding to the intermediate location, wherein the information within the validity window is validated when the failure diagnosis is attributable to deteriorating channel conditions.
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Abstract
This disclosure describes techniques for operating a client device to communicate with a wireless access point to validate data within a frame by comparing channel quality metrics and duration metrics to thresholds. Information received within a validity window may be treated as correctly received even if the frame fails a subsequent verification process or if reception of the frame is terminated prior to the end of the frame.
43 Citations
26 Claims
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1. A client device for communicating with a wireless access point, the client device comprising:
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a data processing module having a processor and memory configured to receive at least a portion of a frame transmitted by the access point to an intermediate location within the frame; and a channel assessment module having a processor and memory configured to determine a validity window with respect to the intermediate location when at least one channel quality metric is greater than or equal to a given threshold, wherein the data processing module is configured to validate information received within the validity window;
wherein the channel quality metric comprises confidence metrics from the output of a Viterbi decoder; and
wherein the frame is received though a verification field and the channel assessment module is further configured to diagnose a failure of the verification field on the basis of a duration metric and a difference between a first channel quality metric measured during a preamble of the frame and a second channel quality metric measured during a time corresponding to the intermediate location, wherein the information within the validity window is validated when the failure diagnosis is attributable to deteriorating channel conditions. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13)
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14. A method for wireless communication with an access point, comprising:
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receiving at least a portion of a frame transmitted by the access point to an intermediate location within the frame with a client device; determining a channel quality metric, wherein the channel quality metric comprises confidence metrics from the output of a Viterbi decoder; establishing a validity window when the channel quality metric is greater than or equal to a given threshold; and validating information from the frame received within the validity window, wherein the frame is received though a verification field, further comprising diagnosing a failure of the verification field on the basis of a duration metric and a difference between a first channel quality metric measured during a preamble of the frame and a second channel quality metric measured during a time corresponding to the intermediate location, wherein the information within the validity window is validated when the failure diagnosis is attributable to deteriorating channel conditions. - View Dependent Claims (15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26)
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Specification