Position determination in a wireless communication system with detection and compensation for repeaters
First Claim
1. A method for determining a position of a remote terminal in a wireless communication network having included therein a plurality of transmitting sources, the method comprising:
- obtaining a set of time measurements for a set of transmitting sources, wherein each time measurement is derived based on a transmission received at the remote terminal from a respective transmitting source that is either an origination source or a repeater associated with the origination source;
identifying a particular origination source for each received time measurement;
generating and maintaining a probable origination source list;
comparing a list of originating sources for the received time measurements against the list of probable origination sources for each of at least one repeater in the network;
determining whether the remote terminal is under a coverage of a particular repeater based on a result of the comparing;
assigning a weighted value to a result of the step of determining wherein the weighted value comprises delays introduces by the at least one repeater; and
calculating the position of the remote terminal based on the time measurements and the assigned weighted value.
2 Assignments
0 Petitions
Accused Products
Abstract
Techniques to detect whether or not a remote terminal is under the coverage of a repeater within a wireless communication network, which may be based on (1) a list of base stations expected to be received while under the repeater'"'"'s coverage, (2) the characterized environment of the repeater, and/or (3) the propagation delays for a transmission received at the remote terminal. Additional ambiguity resulting from being under a repeater'"'"'s coverage may also be accounted for and/or compensated by (1) discarding time measurements from repeated base stations, (2) adjusting the processing for position estimation to account for the additional ambiguity due to the repeater, (3) computing a series of position estimates based on multiple transmissions received from the same originating base station and selecting the best estimate, and/or (4) computing a series of position estimates based on multiple transmissions from multiple originating base stations and selecting the best estimate.
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Citations
45 Claims
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1. A method for determining a position of a remote terminal in a wireless communication network having included therein a plurality of transmitting sources, the method comprising:
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obtaining a set of time measurements for a set of transmitting sources, wherein each time measurement is derived based on a transmission received at the remote terminal from a respective transmitting source that is either an origination source or a repeater associated with the origination source; identifying a particular origination source for each received time measurement; generating and maintaining a probable origination source list; comparing a list of originating sources for the received time measurements against the list of probable origination sources for each of at least one repeater in the network; determining whether the remote terminal is under a coverage of a particular repeater based on a result of the comparing; assigning a weighted value to a result of the step of determining wherein the weighted value comprises delays introduces by the at least one repeater; and calculating the position of the remote terminal based on the time measurements and the assigned weighted value. - View Dependent Claims (2, 3, 4, 5, 6)
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7. A method for determining a position of a remote terminal in a wireless communication network having included therein a plurality of transmitting sources, wherein each transmitting source is either an origination source for a transmission or a repeater associated with the origination source, the method comprising:
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cataloging an environment type for each repeater within the network; generating a probable neighbor list for each repeater from the cataloged environmental types; obtaining a set of time measurements for a set of transmitting sources, wherein each time measurement is derived based on a transmission received at the remote terminal from either an origination source or its associated repeater; determining whether the remote terminal is under a coverage of a particular repeater based on the generated probable neighbor list and the received time measurements; assigning a weighted value to a result of the step of determining wherein the weighted value comprises delays introduces by the particular repeater; and calculating the position of the remote terminal based on the time measurements and the assigned weighted value. - View Dependent Claims (8, 9, 10, 11)
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12. A method for determining a position of a remote terminal in a wireless communication network having included therein a plurality of transmitting sources, the method comprising:
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obtaining at least one time measurement for at least one transmitting source, wherein each received time measurement is derived based on a transmission received at the remote terminal from a transmitting source that is either an origination source or a repeater associated with the origination source; generating an maintaining a list of known or estimated propagation delays for each transmitting source; determining a propagation delays associated with each received time measurement; comparing the propagation delays for each received time measurement against a predetermined threshold value of the known or estimated propagation delays; determining whether the remote terminal is under a coverage of a particular repeater based on a result of the comparing; assigning a weighted value to a result of the step of determining wherein the weighted value comprises delays introduces by the repeater; and calculating the position of the remote terminal based on the time measurements and the assigned weighted value. - View Dependent Claims (13, 14, 15)
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16. A method for determining a position of a remote terminal in a wireless communication network having included therein a plurality of transmitting sources, the method comprising:
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obtaining a set of time measurements for a set of transmitting sources, wherein each time measurement is derived based on a transmission received at the remote terminal from a transmitting source that is either an origination source or a repeater associated with the origination source; identifying a particular origination source for each received time measurement; generating and maintaining a list of origination sources and whether each of the origination sources employ at least one repeater; determining whether the identified origination source for each received time measurement is associated with a repeater; discarding time measurements for selected ones of origination sources determined to be associated with repeaters; and determining an initial position estimate for the remote terminal based on remaining time measurements not discarded. - View Dependent Claims (17, 18, 19, 20, 21)
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22. A method for determining a position of a remote terminal in a wireless communication network having included therein a plurality of transmitting sources, the method comprising:
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obtaining a set of time measurements for a set of transmitting sources, wherein each time measurement is derived based on a transmission received at the remote terminal from a transmitting source that is either an origination source or a repeater associated with the origination source; identifying a particular origination source for each received time measurement; determining an initial position estimate for the remote terminal based on the received time measurements; generating and maintaining a list of origination sources and whether each of the origination sources employ at least one repeater; determining whether the origination source for at least one time measurement used to determine the initial position estimate for the remote terminal is associated with a repeater; assigning a weighted value to a result of the step of determining wherein the weighted value comprises delays introduced by the at least one repeater; and generating one or more search windows for the remote terminal based on the initial position estimate for the remote terminal, wherein each search window is used to search for a respective GPS satellite. - View Dependent Claims (23, 24, 25, 26, 27, 28)
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29. A method for determining a position of a remote terminal in a wireless communication network having included therein a plurality of transmitting sources, the method comprising:
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obtaining a set of time measurements for a set of transmitting sources, wherein each time measurement is derived based on a transmission received at the remote terminal from a transmitting source that is either an origination source or a repeater associated with the origination source, and wherein a plurality of time measurements are received for a plurality of transmissions from a particular origination source or its associated repeater; computing a plurality of position estimates based on the received time measurements; associating each computed position estimate from the plurality of computed position estimates with a predetermined confidence value wherein said confidence value comprises delays introduced by the repeater associated with the origination source; and selecting one of the computed position estimates based the step of associating as an initial position estimate for the remote terminal. - View Dependent Claims (30)
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31. A method for determining a position of a remote terminal in a wireless communication network having included therein a plurality of transmitting sources, the method comprising:
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obtaining a set of time measurements for a set of transmitting sources, wherein each time measurement is derived based on a transmission received at the remote terminal from a transmitting source that is either an origination source or a repeater associated with the origination source; computing a plurality of position estimates based on the received time measurements and a plurality of network hypotheses, wherein each network hypothesis corresponds to a respective combination of origination sources and repeaters hypothesized to be the transmitting sources for the plurality of time measurements used to compute the position estimate for remote terminal; hypothesizing whether the transmitting source is a origination source or a repeater source a result from the each network hypothesis; and selecting one of the computed position estimates as an initial position estimate for the remote terminal based on the step of computing and the step of determining. - View Dependent Claims (32, 33, 34, 35, 36, 37, 38)
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39. A remote terminal in a wireless communication network, comprising:
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a receiver unit configured to receive, process, and digitize a received signal to provide samples; a demodulator coupled to the receiver unit and configured to receive and process the samples to provide a set of time measurements for a set of transmitting sources, wherein each time measurement is derived based on a transmission received at the remote terminal from a respective transmitting source that is either an origination source or a repeater associated with the origination source; a controller operatively coupled to the demodulator and configured to receive the time measurements and further configured to receive or derive one or more search windows based on an initial position estimate for the remote terminal, wherein each search window is used to search for a respective GPS satellite; and a GPS receiver operatively coupled to the controller and configured to search for one or more GPS satellites in accordance with the one or more search windows. - View Dependent Claims (40, 41)
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42. A processing unit in a wireless communication network, comprising:
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a transceiver configured to exchange data with a network entity; a receive data processor coupled to the transceiver and configured to receive from a remote terminal a set of time measurements for a set of transmitting sources, wherein each time measurement is derived based on a transmission received at the remote terminal from a transmitting source that is either an origination source or a repeater associated with the origination source; and a controller coupled to the receive data processor and configured to determine whether the remote terminal is under a coverage of a repeater within the network and to derive an initial position estimate for the remote terminal based on the received time measurements. - View Dependent Claims (43, 44, 45)
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Specification