System and method for position detection of a terminal in a network
First Claim
1. A method for determining a position of a terminal in a system having a terminal apparatus, a plurality of base stations in communication with the terminal apparatus, and a server apparatus connected to the plurality of base stations via a network, the method comprising:
- detecting via the server apparatus a position of the terminal apparatus through at least either a first position detection process or a second position detection process;
performing a first position detection process, including receiving at others of the plurality of base stations signals transferred between one of the plurality of base stations and the terminal apparatus, collecting at the server apparatus information about reception timings of the signals received at each of the others of the plurality base stations, and calculating a position of the terminal apparatus using a plurality of the reception timings and position information about the others of the plurality of base stations;
performing a second position detection process, including collecting at the server apparatus measurement information about received powers of signals transferred between the terminal apparatus and the others of the plurality of base stations, and searching a received power measurement information database previously stored in the server apparatus using a plurality of the measurement information about the received powers, and determining a position of the terminal apparatus based on the searching;
storing, in the received power measurement information database, the position information and received power measurement information corresponding to the position information, the position information being obtained by at least one of the first position detection process and the second position detection process, and the received power measurement information being the received powers of the signals corresponding to the plurality of base stations in response to that the terminal apparatus is detected to be at the position indicated by said position information; and
determining via the server apparatus whether to execute the second position detection process according to information stored in the received power measurement information database.
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Accused Products
Abstract
In a position detection system for detecting a position of a terminal apparatus of a radio communications system, a position detection time is shortened using a position detection method for determining signal times-of-arrival between the terminal apparatus and base stations neighboring the terminal apparatus. According to the present invention, means for generating a database in which received power information about signals transferred between the terminal apparatus and the base stations neighboring the terminal apparatus corresponds to position information about the terminal apparatus, and for determining the position information by searching received power information obtained in the position detection from the database, and means for determining the position by use of signal times-of-arrival are executed in parallel. Then, the use of a result of the means which has detected the position earlier than another means shortens the position detection time.
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Citations
1 Claim
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1. A method for determining a position of a terminal in a system having a terminal apparatus, a plurality of base stations in communication with the terminal apparatus, and a server apparatus connected to the plurality of base stations via a network, the method comprising:
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detecting via the server apparatus a position of the terminal apparatus through at least either a first position detection process or a second position detection process;
performing a first position detection process, including receiving at others of the plurality of base stations signals transferred between one of the plurality of base stations and the terminal apparatus, collecting at the server apparatus information about reception timings of the signals received at each of the others of the plurality base stations, and calculating a position of the terminal apparatus using a plurality of the reception timings and position information about the others of the plurality of base stations;
performing a second position detection process, including collecting at the server apparatus measurement information about received powers of signals transferred between the terminal apparatus and the others of the plurality of base stations, and searching a received power measurement information database previously stored in the server apparatus using a plurality of the measurement information about the received powers, and determining a position of the terminal apparatus based on the searching;
storing, in the received power measurement information database, the position information and received power measurement information corresponding to the position information, the position information being obtained by at least one of the first position detection process and the second position detection process, and the received power measurement information being the received powers of the signals corresponding to the plurality of base stations in response to that the terminal apparatus is detected to be at the position indicated by said position information; and
determining via the server apparatus whether to execute the second position detection process according to information stored in the received power measurement information database.
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Specification