Range rate based stopped detection
First Claim
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1. A method comprising:
- collecting a plurality of round trip time (RTT) measurements between a mobile device and at least one access point (AP);
analyzing the plurality of RTT measurements; and
determining that the mobile device is in a stopped state, including;
analyzing of the plurality of RTT measurements between the mobile device and the at least one AP; and
determining that a change in measured RTT is below a predetermined threshold for a first period of time.
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Abstract
Methods, devices, and systems are described for determining whether a mobile device is in a stopped state based at least in part on round trip time (RTT) measurements between the device and at least one access point. The stopped state determination may be based on RTT measurements alone, or on RTT measurements in combination with other positioning and movement measurements. Further, filtering such as particle and Kalman filtering may be used to improve determination of whether the device is in a stopped state.
14 Citations
29 Claims
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1. A method comprising:
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collecting a plurality of round trip time (RTT) measurements between a mobile device and at least one access point (AP); analyzing the plurality of RTT measurements; and determining that the mobile device is in a stopped state, including; analyzing of the plurality of RTT measurements between the mobile device and the at least one AP; and determining that a change in measured RTT is below a predetermined threshold for a first period of time. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18)
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19. A mobile device comprising:
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means for collecting a plurality of round trip time (RTT) measurements between the mobile device and at least one access point (AP); means for analyzing the plurality of RTT measurements; and means for determining that the mobile device is in a stopped state, including; analyzing the plurality of RTT measurements between the mobile device and the at least one AP; and determining that a change in measured RTT is below a predetermined threshold for a first period of time. - View Dependent Claims (20, 21)
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22. A mobile device comprising:
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a processor; a wireless transceiver coupled to the processor; and a memory coupled to the processor and comprising a round trip time (RTT) positioning module which causes the processor to; collect a plurality of round trip time (RTT) measurements between the mobile device and at least one access point (AP); and determine that the mobile device is in a stopped state, including; analyzing the plurality of RTT measurements between the wireless transceiver and the at least one AP; and determining that a change in measured RTT is below a predetermined threshold for a first period of time. - View Dependent Claims (23, 24)
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25. A non-transitory computer-readable instruction medium comprising instructions that, when executed by a processor coupled to the non-transitory computer-readable instruction medium, cause a mobile device comprising the processor to:
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collect a plurality of round trip time (RTT) measurements between the mobile device and at least one access point (AP); and determine that the mobile device is in a stopped state, including; analyzing the plurality of RTT measurements between the mobile device and the at least one AP; and determining that a change in measured RTT is below a predetermined threshold for a first period of time. - View Dependent Claims (26, 27, 28, 29)
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Specification