Locating method and arrangement
First Claim
1. A locating method for determining the location of a terminal in a radio system comprising a plurality of base stations and terminals, the method comprising:
- at least two base stations with known locations transmit a signal used in locating the terminal;
the signals are transmitted in beams with directional antenna patterns;
the direction of the beam is changed as a function of time;
the terminal measures the signals transmitted by said at least two base stations, wherein on the basis of the terminal measurements, both a location of the at least two base stations and the transmission direction of the signals used in location determination are determined; and
the location of the terminal is determined on the basis of the location of the base stations and the transmission direction of the signal used in location determination.
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Accused Products
Abstract
The invention relates to a locating method and an arrangement for determining the location of a terminal in a radio system comprising a plurality of base stations and terminals. At least two base stations with known locations transmit a signal used in locating the terminal, and the signals are transmitted in beams with directional antenna patterns and the direction of the beams is changed as a function of time. The terminal determines the location of the base station and the transmission direction of the signal used in location determination by means of the beam transmitted by said at least two base stations. Since the terminal is located at the intersection of the beams of the base stations transmitting from known locations, the location of the terminal can easily be determined. The solution takes multipath propagation into account.
23 Citations
28 Claims
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1. A locating method for determining the location of a terminal in a radio system comprising a plurality of base stations and terminals, the method comprising:
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at least two base stations with known locations transmit a signal used in locating the terminal;
the signals are transmitted in beams with directional antenna patterns;
the direction of the beam is changed as a function of time;
the terminal measures the signals transmitted by said at least two base stations, wherein on the basis of the terminal measurements, both a location of the at least two base stations and the transmission direction of the signals used in location determination are determined; and
the location of the terminal is determined on the basis of the location of the base stations and the transmission direction of the signal used in location determination. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14)
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15. A locating arrangement for determining the location of a terminal in a radio system comprising a plurality of base stations and terminals, the arrangement comprising:
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at least two base stations with known locations comprise a transmitter for transmitting a signal used in locating the terminal and having a directed beam, and the transmitter is arranged to change the direction of the beam as a function of time;
the terminal comprises means in a receiver which are arranged to measure the signals which are arranged to determine the location of the base station and the transmission angle of the signal used in location determination, and the radio system comprises means for determining the location of the terminal on the basis of the measurement performed by the terminal. - View Dependent Claims (16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28)
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Specification