Assistance data cell selection based on interference estimates in a wireless communications system
First Claim
1. A method for assisting a mobile device to perform positioning measurements on positioning signals periodically transmitted by at least some of a plurality of cells in a wireless communication network, the method comprising:
- determining an estimated position of the mobile device;
determining a first set of candidate cells of the plurality of cells in the wireless communication network based on the estimated position of the mobile device;
estimating an expected interference of each respective positioning signal that is transmitted by each candidate cell of the first set caused, at least in part, by transmission of signals by one or more other cells of the plurality of cells;
selecting a subset of cells from the first set of candidate cells based on the estimated expected interference;
generating assistance data that identifies the selected subset of cells; and
sending the generated assistance data to the mobile device.
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Accused Products
Abstract
A method for assisting a mobile device to perform positioning measurements on positioning signals periodically transmitted by at least some of a plurality of cells in a wireless communication network includes determining an estimated position of the mobile device and then determining a first set of candidate cells of the plurality of cells based on the estimated position of the mobile device. The method also includes estimating an expected interference of each respective positioning signal that is transmitted by each candidate cell of the first set and selecting a subset of cells from the first set of candidate cells based on the estimated expected interference. Assistance data identifying the selected subset of cells is then generated and sent to the mobile device.
37 Citations
25 Claims
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1. A method for assisting a mobile device to perform positioning measurements on positioning signals periodically transmitted by at least some of a plurality of cells in a wireless communication network, the method comprising:
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determining an estimated position of the mobile device; determining a first set of candidate cells of the plurality of cells in the wireless communication network based on the estimated position of the mobile device; estimating an expected interference of each respective positioning signal that is transmitted by each candidate cell of the first set caused, at least in part, by transmission of signals by one or more other cells of the plurality of cells; selecting a subset of cells from the first set of candidate cells based on the estimated expected interference; generating assistance data that identifies the selected subset of cells; and sending the generated assistance data to the mobile device. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
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9. A non-transitory computer-readable medium including program code stored thereon for assisting a mobile device to perform positioning measurements on positioning signals periodically transmitted by at least some of a plurality of cells in a wireless communication network, the program code comprising instructions to:
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determine an estimated position of the mobile device; determine a first set of candidate cells of the plurality of cells in the wireless communication network based on the estimated position of the mobile device; estimate an expected interference of each respective positioning signal that is transmitted by each candidate cell of the first set caused, at least in part, by transmission of signals by one or more other cells of the plurality of cells; select a subset of cells from the first set of candidate cells based on the estimated expected interference; generate assistance data that identifies the selected subset of cells; and send the generated assistance data to the mobile device. - View Dependent Claims (10, 11, 12, 13)
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14. An apparatus for assisting a mobile device to perform positioning measurements on positioning signals periodically transmitted by at least some of a plurality of cells in a wireless communication network, the apparatus comprising:
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memory adapted to store program code; and a processing unit coupled to the memory to access and execute instructions included in the program code to direct the apparatus to; determine an estimated position of the mobile device; determine a first set of candidate cells of the plurality of cells in the wireless communication network based on the estimated position of the mobile device; estimate an expected interference of each respective positioning signal that is transmitted by each candidate cell of the first set caused, at least in part, by transmission of signals by one or more other cells of the plurality of cells; select a subset of cells from the first set of candidate cells based on the estimated expected interference; generate assistance data that identifies the selected subset of cells; and send the generated assistance data to the mobile device. - View Dependent Claims (15, 16, 17, 18, 19, 20)
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21. A location server for use with a Long Term Evolution (LTE) wireless communication system, the location server comprising:
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memory adapted to store program code; and a processing unit coupled to the memory to access and execute instructions included in the program code to direct the location server to; receive a request for assistance data from the mobile device via a serving cell of a plurality of cells included in the LTE wireless communication system, wherein each cell of the plurality of cells is configured to periodically transmit a Position Reference Signal (PRS) for Observed Time Difference Of Arrival (OTDOA) positioning of a mobile device within the LTE wireless communication system; determine an estimated position of the mobile device in response to receiving the request for assistance data; determine a first set of candidate cells of the plurality of cells in the LTE wireless communication network based on the estimated position of the mobile device; estimate an expected interference of each respective Position Reference Signal that is transmitted by each candidate cell of the first set caused, at least in part, by transmission of signals by one or more other cells of the plurality of cells; select a subset of cells from the first set of candidate cells based on the estimated expected interference; generate the assistance data that includes a Physical Cell ID (PCI) for each cell included in the selected subset of cells; and send the generated assistance data to the mobile device. - View Dependent Claims (22, 23, 24, 25)
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Specification