Methods and systems for ranging protocol
AssigneeQUALCOMM Incorporated
InventorsCarlos Aldana, Xiaoxin Zhang
Life of this patent
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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.
Claims30
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.
At a first wireless transceiver device, a method comprising:
- 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.
A first wireless transceiver device, comprising:
- 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.
A first wireless transceiver device comprising:
- 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.
Dependencies are inferred from the claim text.