BROADCASTING SHORT INTERFRAME SPACE INFORMATION FOR LOCATION PURPOSES
First Claim
1. A method for estimating a position of a wireless node in a communication system, comprising:
- computing a round trip time (RTT) of a frame using a turn-around calibration factor (TCF);
comparing the computed RTT with RTTs of other nodes in the communication system;
estimating the position of the node based on the comparison of the RTTs.
2 Assignments
0 Petitions
Accused Products
Abstract
A method and apparatus for broadcasting short interframe space information to aid in determining a round trip time are provided. The round trip time is used as an aid in locating nodes within a WiFi or WLAN network. The method begins with capturing a time of transmission of a frame by a transmitting station. The receiving station then captures the time of arrival of the frame just sent by the transmitting station. The receiving station replies with a received frame message and the time of departure is captured. The transmitting station then captures the time of arrival of the received frame message. The captured arrival and departure times of the frame and the received frame message allow the round trip time to be computed. The RTT may then be included as part of a network message.
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Citations
26 Claims
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1. A method for estimating a position of a wireless node in a communication system, comprising:
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computing a round trip time (RTT) of a frame using a turn-around calibration factor (TCF); comparing the computed RTT with RTTs of other nodes in the communication system; estimating the position of the node based on the comparison of the RTTs. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13)
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14. A method for estimating a round trip time (RTT), comprising:
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capturing a time of transmission of a frame by a transmitting station; capturing a time of arrival of the frame sent by the transmitting station by a receiving station; capturing a time of departure of a received frame message by the transmitting station; capturing the time of arrival of the received frame message by the transmitting station; and computing a RTT based on the captured time of arrival and the captured time of departure of both the frame and the received frame message and a turn-around calibration factor (TCF). - View Dependent Claims (15, 16, 17)
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18. An apparatus for estimating a position of a wireless node in a communication system, comprising:
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a processor for computing a round trip time (RTT) of a frame using a turn-around calibration factor (TCF); a processor for comparing the computed RTT with RTTs of other nodes in the communication system; and a processor for estimating the position of the node based on the comparison of the RTTs.
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19. An apparatus for estimating a round trip time, comprising:
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a processor for capturing a time of transmission of a frame; a processor for capturing a time of arrival of a frame; a receiver for receiving a time of arrival of a frame; a processor for computing a round trip time using a turn-around calibration factor (TCF); and a transmitter for transmitting a computed round trip time as part of a network message.
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20. An apparatus for estimating a position of a wireless node in a communication system, comprising:
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means for computing a round trip time (RTT) of a frame using a turn-around calibration factor (TCF); means for comparing the computed RTT with RTTs of other nodes in the communication system; and means for estimating the position of the node based on the comparison of the RTTs.
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21. An apparatus for estimating a position of a wireless node in a communication system, comprising:
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means for capturing a time of transmission of a frame by a transmitting station; means for capturing a time of arrival of the frame sent by the transmitting station by a receiving station; means for capturing a time of departure of a received frame message by the transmitting station; means for capturing the time of arrival of the received frame message by the transmitting station; and means for computing a RTT based on the captured time of arrival and the captured time of departure of both the frame and the received frame message and a turn-around calibration factor (TCF). - View Dependent Claims (22, 23, 24)
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25. A non-transitory computer-readable medium containing instructions, which when executed by a processor, cause the processor to perform the steps of:
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computing a round trip time (RTT) of a frame using a turn-around calibration factor (TCF); comparing the computed RTT with RTTs of other nodes in the communication system; and estimating the position of the node based on the comparison of the RTTs.
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26. A non-transitory computer-readable medium containing instructions, which when executed by a processor, cause the processor to perform the steps of:
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capturing a time of transmission of a frame by a transmitting station; capturing a time of arrival of the frame sent by the transmitting station by a receiving station; capturing a time of departure of a received frame message by the transmitting station; capturing the time of arrival of the received frame message by the transmitting station; and computing a RTT based on the captured time of arrival and the captured time of departure of both the frame and the received frame message and a turn-around calibration factor (TCF).
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Specification