Patent ID: 8837316
Filing Date: 2014-09-16
Classification: G01S,H04J,H04W

Abstract:
1. A method of performing a ranging operation between a first wireless station (STA) and a second wireless STA, the method comprising: transmitting a request (REQ) frame from the first STA to the second STA; determining a time of departure (TOD) of the REQ frame; receiving an acknowledgement (ACK) frame from the second STA by the first STA, wherein the ACK frame includes a timestamp bit indicating whether the second STA captures timestamps; determining a TOA of the ACK frame at the first STA; when the timestamp bit indicates that the second STA does not capture timestamps, then determining a round trip time (RTT) value of the REQ frame and the ACK frame; and when the timestamp bit indicates that the second STA captures timestamps, then initiating an exchange of a number of measurement action frames and corresponding measurement acknowledgement frames between the second STA and the first STA to refine timing errors in the determined TOA by generating a number of half-RTT values between the second STA and the first STA, wherein each of the half-RTT values indicates a propagation time of a signal transmitted between the second STA and the first STA.