METHODS AND SYSTEMS FOR RANGING PROTOCOL
First Claim
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1. At a first wireless transceiver device, a method comprising:
- receiving a plurality of fine timing measurement (FTM) messages from a second wireless transceiver device, the plurality of FTM messages having been transmitted by the second wireless transceiver device in response to receipt, at the second wireless transceiver device, of an FTM request message, at least one of the plurality of FTM messages comprising a time stamp indicating a transmission time of a previously transmitted FTM message; and
computing a time of flight based, at least in part, on the time stamp and a time of receipt of the previously transmitted FTM message.
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Abstract
Disclosed are systems, methods and devices for measuring a range between wireless devices using an exchange of messages between devices. For example, wireless transceiver devices may exchange messages transmitted in a wireless communications link to measure a time of flight. Based, at least in part, on the measured time of flight, a location of one of the wireless transceiver devices may be estimated.
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Citations
30 Claims
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1. At a first wireless transceiver device, a method comprising:
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receiving a plurality of fine timing measurement (FTM) messages from a second wireless transceiver device, the plurality of FTM messages having been transmitted by the second wireless transceiver device in response to receipt, at the second wireless transceiver device, of an FTM request message, at least one of the plurality of FTM messages comprising a time stamp indicating a transmission time of a previously transmitted FTM message; and computing a time of flight based, at least in part, on the time stamp and a time of receipt of the previously transmitted FTM message. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10)
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11. At a first wireless transceiver device, a method comprising:
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receiving a fine timing measurement (FTM) request message from a second wireless transceiver device; and transmitting a plurality of FTM messages, at least one of the plurality of FTM messages comprising a time stamp indicating a transmission time of a previously transmitted FTM message. - View Dependent Claims (12, 13, 14, 15, 16, 17, 18)
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19. A first wireless transceiver device, comprising:
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a transceiver to transmit message to and receive messages from a wireless communication network; and one or more processors to configured to; obtain a plurality of fine timing measurement (FTM) messages at the transceiver from a second wireless transceiver device, the plurality of FTM messages being transmitted by the second wireless transceiver device in response to receipt, at the second wireless transceiver device, of an FTM request message, at least one of the plurality of FTM messages comprising a time stamp indicating a transmission time of a previously transmitted FTM message; and compute a time of flight based, at least in part, on the time stamp and a time of receipt of the previously transmitted FTM message. - View Dependent Claims (20, 21, 22, 23, 24)
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25. A first wireless transceiver device comprising:
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a transceiver; and one or more processors configured to; obtain a fine timing measurement (FTM) request message received at the transceiver and transmitted from a second wireless transceiver device; and initiate transmission of a plurality of FTM messages through the transceiver, at least one of the plurality of FTM messages comprising a time stamp indicating a transmission time of a previously received FTM message, in response to the FTM request message. - View Dependent Claims (26, 27, 28, 29, 30)
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Specification