Data boundary aware base station assisted position location
First Claim
1. A mobile unit comprising:
- a coherent integrator adapted to receive data phase information from a first source and adapted to receive a content-bearing signal from a second source, different from the first source,wherein the data phase information is indicative of timing of data transitions for corresponding data boundaries in the content-bearing signal, andwherein the data phase information is used to coherently integrate the content-bearing signal over first and second sections of time in a coherent integration window of time that precede in time and follow in time, respectively, a data boundary in the content-bearing signal when the data boundary in the content-bearing signal occurs within the coherent integration window of time.
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Abstract
The present invention is a novel and improved method and apparatus for performing position location in wireless communications system. One embodiment of the invention comprises a method for performing position location on a subscriber unit in a terrestrial wireless telephone system using a set of satellites each transmitting a signal, the terrestrial wireless telephone system having base stations, including the steps of transmitting an aiding message from the base station to the subscriber unit, said aiding message containing information regarding a data boundary for each signal from the set of satellites, applying correlation codes to each signal yielding corresponding correlation data and accumulating said correlation data over an first interval preceding a corresponding data boundary yielding a first accumulation result, and a second interval following said corresponding data boundary yielding a second accumulation result.
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Citations
30 Claims
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1. A mobile unit comprising:
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a coherent integrator adapted to receive data phase information from a first source and adapted to receive a content-bearing signal from a second source, different from the first source, wherein the data phase information is indicative of timing of data transitions for corresponding data boundaries in the content-bearing signal, and wherein the data phase information is used to coherently integrate the content-bearing signal over first and second sections of time in a coherent integration window of time that precede in time and follow in time, respectively, a data boundary in the content-bearing signal when the data boundary in the content-bearing signal occurs within the coherent integration window of time. - View Dependent Claims (2, 3, 4, 5, 6)
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7. In a mobile unit, a tangible machine readable medium comprising executable data adapted to cause a programmable device to perform the steps of:
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(a) receiving data phase information from a first source; (b) receiving a content-bearing signal from a second source, different from the first source, wherein the data phase information is indicative of timing of data transitions for corresponding data boundaries in the content-bearing signal; and (c) using the data phase information to perform coherent integration on the content-bearing signal over first and second sections of time in a coherent integration window of time that precede and follow, respectively, a data boundary in the content-bearing signal when the data boundary in the content-bearing signal is within the coherent integration window of time.
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8. In a mobile unit, a tangible machine readable medium comprising executable data capable of causing a programmable device to perform the steps of:
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receiving, from a first source, a first signal having at least one data boundary; receiving, from a second source, a second signal including an aiding message containing information regarding timing of at least one of the data boundaries within the first signal; applying correlation codes to the first signal to produce correlation data; accumulating the correlation data over a first time interval preceding a first one of the data boundaries within the first signal to produce a first accumulation result; and accumulating the correlation data over a second time interval following the first one of the data boundaries within the first signal to produce a second accumulation result.
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9. A mobile unit comprising:
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a receiver adapted to receive from a first source, external to the mobile unit, a signal, having a data phase representative of timing transitions at data boundaries in the signal, responsive to receiving predetermined data phase information, representative of the timing transitions at the data boundaries in the signal, from a second source, external to the mobile unit and different from the first source, to determine when a timing transition at a data boundary in the signal occurs within a predetermined window of time; wherein the predetermined data phase information represents a plurality of values, and wherein each value of the plurality of values represents a particular timing transition at the data boundaries in the signal. - View Dependent Claims (10, 11, 12, 13, 14, 15, 16)
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17. A mobile unit comprising:
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a receiver adapted to receive from a global positioning system (GPS) a signal, having a data phase representative of timing transitions at data boundaries in the signal, responsive to receiving data phase information, representative of the timing transitions at the data boundaries in the signal, from a terrestrial base station to determine when a timing transition at a data boundary in the signal occurs within a predetermined window of time; wherein the data phase information represents a plurality of values, and wherein each value of the plurality of values represents a particular timing transition at the data boundaries in the signal. - View Dependent Claims (18, 19, 20, 21, 22)
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23. A tangible machine readable medium, for use within a mobile unit, comprising executable data adapted to cause a programmable device to perform:
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receiving from a first source, external to the mobile unit, a signal, having a data phase representative of timing transitions at data boundaries in the signal, responsive to receiving predetermined data phase information, representative of the timing transitions at the data boundaries in the signal, from a second source, external to the mobile unit and different from the first source, to determine when a timing transition at a data boundary in the signal occurs within a predetermined window of time; wherein the predetermined data phase information represents a plurality of values, and wherein each value of the plurality of values represents a particular timing transition at the data boundaries in the signal. - View Dependent Claims (24, 25, 26, 27, 28, 29, 30)
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Specification