HYBRID POSITIONING USING SYNCHRONOUS AND ASYNCHRONOUS TECHNIQUES
First Claim
1. A wireless communications apparatus comprising:
- a transmitter configured to transmit a request to a mobile station for fine time assistance (FTA) corresponding to a global navigation satellite system (GNSS);
a receiver configured to receive the FTA from the mobile station in response to the request, first timing measurements obtained by the mobile station from one or more base stations, and second timing measurements obtained by the mobile station from the GNSS; and
a processor communicatively coupled to the transmitter and the receiver and configured to;
identify whether the FTA was received from the mobile station; and
if the FTA was received from the mobile station,establish a position fix for the mobile station using a synchronous hybrid positioning technique; and
if the FTA was not received from the mobile station,establish the position fix for the mobile station using an asynchronous hybrid positioning technique.
1 Assignment
0 Petitions
Accused Products
Abstract
Methods and apparatuses for a mobile station to obtain a position fix using synchronous hybrid positioning and asynchronous hybrid positioning techniques are described. In one embodiment, a wireless communication apparatus may transmit a request to a mobile station for fine time assistance (FTA) corresponding to a global navigation satellite system (GNSS). The apparatus may be configured to receive the FTA, first timing measurements from one or more base stations, and second timing measurements from the GNSS. The apparatus may identify whether the FTA was received from the mobile station. If it is determined that the FTA was received, then the apparatus may establish a position fix for the mobile station using a synchronous hybrid positioning technique relating the timing measurements to a time scale associated with a system frame number (SFN). If not, then the apparatus may establish the position fix using an asynchronous hybrid positioning technique.
16 Citations
34 Claims
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1. A wireless communications apparatus comprising:
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a transmitter configured to transmit a request to a mobile station for fine time assistance (FTA) corresponding to a global navigation satellite system (GNSS); a receiver configured to receive the FTA from the mobile station in response to the request, first timing measurements obtained by the mobile station from one or more base stations, and second timing measurements obtained by the mobile station from the GNSS; and a processor communicatively coupled to the transmitter and the receiver and configured to; identify whether the FTA was received from the mobile station; and if the FTA was received from the mobile station, establish a position fix for the mobile station using a synchronous hybrid positioning technique; and if the FTA was not received from the mobile station, establish the position fix for the mobile station using an asynchronous hybrid positioning technique. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10)
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11. A method comprising:
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transmitting a request to a mobile station for fine time assistance (FTA) corresponding to a global navigation satellite system (GNSS); receiving a response from the mobile station in response to the request, first timing measurements obtained by the mobile station from one or more base stations, and second timing measurements obtained by the mobile station from the GNSS; identifying whether the FTA was contained in the response from the mobile station in response to the request; and if the FTA was contained in the response, establishing a position fix for the mobile station using a synchronous hybrid positioning technique; and if the FTA was not contained in the response, establishing the position fix for the mobile station using an asynchronous hybrid positioning technique. - View Dependent Claims (12, 13, 14, 15, 16, 17, 18)
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19. A wireless communications apparatus comprising:
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means for transmitting a request to a mobile station for fine time assistance (FTA) corresponding to a global navigation satellite system (GNSS); means for receiving the FTA from the mobile station in response to the request, first timing measurements obtained by the mobile station from one or more base stations, and second timing measurements obtained by the mobile station from the GNSS; means for identifying whether the FTA was received in response to the request; means for establishing a position fix for the mobile station using a synchronous hybrid positioning technique, if the FTA was received in response to the request; and means for establishing a position fix for the mobile station using an asynchronous hybrid positioning technique, if the FTA was not received in response to the request. - View Dependent Claims (20, 21, 22, 23, 24, 25)
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26. A computer program product residing on a processor-readable medium and comprising processor-readable instructions configured to cause a processor to:
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transmit a request to a mobile station for fine time assistance (FTA) corresponding to a global navigation satellite system (GNSS); receive a response to the request to the mobile station for the FTA from the mobile station, first timing measurements obtained by the mobile station from one or more base stations, and second timing measurements obtained by the mobile station from the GNSS; identify whether the response to the request for the FTA from the mobile station contained the FTA; establish a position fix for the mobile station using a synchronous hybrid positioning technique, if the FTA was contained in the response to the request; and establish a position fix for the mobile station using an asynchronous hybrid positioning technique, if the FTA was not contained in the response to the request. - View Dependent Claims (27, 28, 29, 30, 31, 32)
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33. A method for a mobile station, comprising:
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obtaining fine time assistance (FTA) that is associated with a global navigation satellite system (GNSS); identifying a system frame number (SFN) received within the FTA, wherein the SFN is associated with at least one base station; forming one or more pseudoranges for the mobile station based on first timing measurements and second timing measurements relative to a time scale associated with the SFN, wherein; the first timing measurements are obtained by the mobile station from the at least one base station, the second timing measurements are obtained by the mobile station from the GNSS, and the time scale comprises a known offset between the first timing measurements and the second timing measurements; and establishing a position fix for the mobile station based on the pseudoranges.
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34. A method for a mobile station, comprising:
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forming one or more pseudoranges for the mobile station based on first timing measurements and second timing measurements, wherein; the first timing measurements are obtained by the mobile station from at least one base station, and the second timing measurements are obtained by the mobile station from a global navigation satellite system (GNSS); a time scale for the first timing measurements and a time scale for the second timing measurements are not interrelated; and establishing a position fix for the mobile station based on the pseudoranges.
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Specification