Enhancing A-GPS location accuracy and yield with location measurement units and network timing measurements
First Claim
1. A method of determining the location of a mobile device comprising the steps of:
- requesting by a node one or more location measurement units (LMUs) to provide timing relationship information from a respective cell site in a communications network;
receiving, at the node, a location request by the node for a target mobile device that includes at least one of tipping information for the target mobile device, uplink signal radio frequency information and serving site identification;
transmitting, from the node, a request message to the target mobile device in response to the location request;
tasking the one or more LMUs to measure uplink times of arrival of signals received by the LMUs from a target mobile device;
receiving a response message from the target mobile device, the response message having reference epoch frame information;
determining a Global Positioning System (GPS) time estimate at the reference epoch that the target mobile device used to make GPS satellite measurements, wherein the determination is performed as a function of the requested LMU timing relationship information;
determining satellite information using the determined GPS time estimate; and
determining a location of the mobile device as a function of the determined satellite information.
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Accused Products
Abstract
A system and method for determining the location of a mobile device. One or more location measurement units (LMUs) or components may be requested to provide timing relationship information from a respective cell site. These LMUs may then be tasked to measure uplink times of arrival of signals received by the LMUs from a target mobile device. A response message from the target mobile device may be received, the response message having reference epoch frame information whereby a Global Positioning System (GPS) time estimate at the reference epoch that the target mobile device used to make GPS satellite measurements is determined as a function of the requested timing relationship information. Satellite information may then be determined using the determined GPS time estimate, and a location of the mobile device performed using this satellite information.
14 Citations
10 Claims
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1. A method of determining the location of a mobile device comprising the steps of:
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requesting by a node one or more location measurement units (LMUs) to provide timing relationship information from a respective cell site in a communications network; receiving, at the node, a location request by the node for a target mobile device that includes at least one of tipping information for the target mobile device, uplink signal radio frequency information and serving site identification; transmitting, from the node, a request message to the target mobile device in response to the location request; tasking the one or more LMUs to measure uplink times of arrival of signals received by the LMUs from a target mobile device; receiving a response message from the target mobile device, the response message having reference epoch frame information; determining a Global Positioning System (GPS) time estimate at the reference epoch that the target mobile device used to make GPS satellite measurements, wherein the determination is performed as a function of the requested LMU timing relationship information; determining satellite information using the determined GPS time estimate; and determining a location of the mobile device as a function of the determined satellite information. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
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9. A method of determining the location of a mobile device comprising the steps of:
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requesting by a node one or more location measurement units (LMUs) to provide timing relationship information from a respective cell site in a communications network; tasking the one or more LMUs to measure uplink times of arrival of signals received by the LMUs from a target mobile device; receiving a response message from the target mobile device, the response message having reference epoch frame information; determining a Global Positioning System (GPS) time estimate at the reference epoch that the target mobile device used to make GPS satellite measurements, wherein the determination is performed as a function of the requested LMU timing relationship information; determining satellite information using the determined GPS time estimate; and determining a location of the mobile device as a function of the determined satellite information; wherein the determined GPS time estimate is determined using the relationship;
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10. A method of determining the location of a mobile device comprising the steps of:
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receiving at a node timing relationship information from a respective cell site in a communications network; receiving, at the node, a location request for a target mobile device that includes at least one of tipping information for the target mobile device, uplink signal radio frequency information and serving site information for the target mobile device; transmitting a request message to the target mobile in response to the location request; measuring uplink times of arrival of signals from the target mobile device; receiving a response message from the target mobile device, the response message having reference epoch frame information; determining a Global Positioning System (GPS) time estimate at the reference epoch that the target mobile device used to make GPS satellite measurements, wherein the determination is performed as a function of the received timing relationship information; determining satellite information using the determined GPS time estimate; and determining a location of the mobile device as a function of the determined satellite information.
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Specification