US 9,810,780 B2
Time of flight (ToF) measurement
Shani Ben-Haim, Haifa (IL); Yuval Amizur, Kfar-Saba (IL); and Jonathan Segev, Tel Mond (IL)
Assigned to INTEL CORPORATION, Santa Clara, CA (US)
Filed by INTEL CORPORATION, Santa Clara, CA (US)
Filed on Nov. 2, 2016, as Appl. No. 15/341,326.
Application 15/341,326 is a continuation of application No. 14/700,486, filed on Apr. 30, 2015, granted, now 9,618,603.
Application 14/700,486 is a continuation of application No. 13/929,139, filed on Jun. 27, 2013, granted, now 9,125,168, issued on Sep. 1, 2015.
Claims priority of provisional application 61/755,609, filed on Jan. 23, 2013.
Prior Publication US 2017/0052251 A1, Feb. 23, 2017
Int. Cl. G01S 13/76 (2006.01); H04W 24/00 (2009.01); H04W 64/00 (2009.01); G01S 5/14 (2006.01); H04W 24/08 (2009.01)
CPC G01S 13/767 (2013.01) [G01S 5/14 (2013.01); H04W 24/00 (2013.01); H04W 24/08 (2013.01); H04W 64/00 (2013.01); Y02B 60/50 (2013.01)] 23 Claims
OG exemplary drawing
 
1. An apparatus comprising circuitry configured to cause a responding station to:
receive an initial time of flight (ToF) measurement request from an initiating station, the initial ToF measurement request comprising a measurement request bit indicating a request to perform a ToF measurement;
transmit a first acknowledgment (ACK) to the initiating station;
transmit a first responder ToF frame after the first ACK, the first responder ToF frame comprising a status field to indicate if the request to perform the ToF measurement is accepted or not accepted, the first responder ToF frame comprising an indication of a time period during which a subsequent ToF measurement request is to be transmitted;
receive a second ACK from the initiating station;
receive the subsequent ToF measurement request from the initiating station, the subsequent ToF measurement request comprising an indication of a request for ToF measurements;
transmit a third ACK to the initiating station; and
transmit to the initiating station another responder ToF frame comprising ToF measurements in a time of arrival (ToA) field and time of departure (ToD) field.