Methods and systems for locating a mobile device using an asynchronous wireless network
First Claim
1. A method of locating a User Equipment (UE) at a first base station, the method comprising:
- measuring a first time of arrival (TOA) of a first reference signal received from a second base station;
determining a first Real Time Difference (RTD) between a first transmission from the first base station and a second transmission from the second base station, based at least in part on the first TOA, wherein determining the first RTD further comprises determining a first Round Trip signal propagation Time (RTT) between the first base station and the second base station;
measuring a second TOA of an uplink signal received from the UE;
determining a second RTT between the first base station and the UE based at least in part on the second TOA;
receiving a first Reference Signal Time Difference (RSTD) for the first base station and the second base station from the UE; and
sending location information for the UE to a location-capable device, wherein the location information is based at least in part on the first RTD, the second RTT, and the first RSTD.
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Accused Products
Abstract
Techniques described herein are directed to position determination of a user equipment (UE) in an asynchronous wireless network, such as a 4G or 5G network. In one embodiment, a base station measures real time differences (RTDs) to neighboring base stations and a Round Trip signal propagation Time (RTT) to the UE and receives Reference Signal Time Difference (RSTD) measurements from the UE, whereby a location of the UE is determined using the RTD measurements, RTT measurement and RSTD measurements. In other embodiments, the UE may obtain the RTT and RSTD measurements and may receive RTD measurements from a base station, whereby a location of the UE is determined by the UE or by a location server.
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Citations
29 Claims
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1. A method of locating a User Equipment (UE) at a first base station, the method comprising:
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measuring a first time of arrival (TOA) of a first reference signal received from a second base station; determining a first Real Time Difference (RTD) between a first transmission from the first base station and a second transmission from the second base station, based at least in part on the first TOA, wherein determining the first RTD further comprises determining a first Round Trip signal propagation Time (RTT) between the first base station and the second base station; measuring a second TOA of an uplink signal received from the UE; determining a second RTT between the first base station and the UE based at least in part on the second TOA; receiving a first Reference Signal Time Difference (RSTD) for the first base station and the second base station from the UE; and sending location information for the UE to a location-capable device, wherein the location information is based at least in part on the first RTD, the second RTT, and the first RSTD. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12)
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13. A method of locating a User Equipment (UE) at the UE, the method comprising:
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measuring a time of arrival (TOA) for a first reference signal received from a first base station; determining a first Round Trip signal propagation Time (RTT) between the first base station and the UE based at least in part on the TOA; measuring a first Reference Signal Time Difference (RSTD) between a second reference signal for the first base station and a third reference signal for a second base station; receiving a first real time difference (RTD) between the first base station and the second base station, based on a second RTT between the first base station and the second base station; and determining a location of the UE, based at least in part on the first RTT, the first RSTD, and the first RTD. - View Dependent Claims (14, 15, 16, 17, 18, 19, 20, 21, 22)
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23. A base station comprising:
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a wireless communication interface; a memory; and a processing unit communicatively coupled with the wireless communication interface and the memory and configured to; measure, with the wireless communication interface, a first time of arrival (TOA) of a first reference signal received from a second base station; determine a first Real Time Difference (RTD) between a first transmission from the base station and a second transmission from the second base station, based at least in part on the first TOA, wherein determining the first RTD further comprises determining a first Round Trip signal propagation Time (RTT) between the first base station and the second base station; measure, with the wireless communication interface, a second TOA of an uplink signal received from a User Equipment (UE); determine a second RTT between the base station and the UE based at least in part on the second TOA; receive, with the wireless communication interface, a first Reference Signal Time Difference (RSTD) for the base station and the second base station from the UE; and send, with the wireless communication interface, location information for the UE to a location-capable device, wherein the location information is based at least in part on the first RTD, the second RTT, and the first RSTD. - View Dependent Claims (24, 25, 26)
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27. A User Equipment (UE) comprising:
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a wireless communication interface; a memory; and a processing unit communicatively coupled with the wireless communication interface and the memory and configured to; measure, using the wireless communication interface, a time of arrival (TOA) for a first reference signal received from a first base station; determine a first Round Trip signal propagation Time (RTT) between the first base station and the UE based at least in part on the TOA; measure, using the wireless communication interface, a first Reference Signal Time Difference (RSTD) between a second reference signal for the first base station and a third reference signal for a second base station; receive, using the wireless communication interface, a first real time difference (RTD) between the first base station and the second base station, based on a second RTT between the first base station and the second base station; and determine a location of the UE, based at least in part on the first RTT, the first RSTD, and the first RTD. - View Dependent Claims (28, 29)
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Specification