Location of a mobile station in a telecommunication system
First Claim
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1. A method comprising:
- determining a characteristic parameter describing line-of-sight conditions of a radio propagation environment of at least for two base stations in a mobile telecommunications system, wherein the characteristic parameter describes excess path lengths caused by obstacles in the environment by means of one of a number of discrete levels;
measuring at least one feature of a signal transmitted between a mobile station and the at least two base stations, the feature being such that it can be used for determination of distances between the mobile station and the two base stations; and
computing the distances between the mobile station and the two base stations using the measured signal feature and the characteristic parameter describing the line-of-sight conditions of the at least two base stations; and
determining a current geographical location of the mobile station based on the determined distances between the mobile station and the at least two base stations;
wherein the at least one feature comprises at least travel time or travel time difference of the signal between the mobile station and the at least two base stations.
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Abstract
Means and a method for determination of a distance between a transmitting station and a receiving station is disclosed. In the method a characteristic parameter is determined for the radio propagation environment of the receiving station. At least one feature of a signal that has been received at the receiving station is measured, said feature being such that it can be used for the determination of the distance between the stations. The distance is then computed based on said measured signal feature and the characteristic parameter.
24 Citations
19 Claims
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1. A method comprising:
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determining a characteristic parameter describing line-of-sight conditions of a radio propagation environment of at least for two base stations in a mobile telecommunications system, wherein the characteristic parameter describes excess path lengths caused by obstacles in the environment by means of one of a number of discrete levels; measuring at least one feature of a signal transmitted between a mobile station and the at least two base stations, the feature being such that it can be used for determination of distances between the mobile station and the two base stations; and computing the distances between the mobile station and the two base stations using the measured signal feature and the characteristic parameter describing the line-of-sight conditions of the at least two base stations; and determining a current geographical location of the mobile station based on the determined distances between the mobile station and the at least two base stations;
wherein the at least one feature comprises at least travel time or travel time difference of the signal between the mobile station and the at least two base stations. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
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10. Apparatus, comprising:
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storage device for storing a characteristic parameter describing line-of-sight conditions of a radio propagation environment for at least two base stations, wherein the characteristic parameter describes excess path lengths caused by obstacles in the radio propagation environment by means of one of a number of discrete levels; measurement device for measuring a feature of a signal transmitted between the mobile station and the at least two base stations for determination of distances between the mobile station and the at least two base stations; and a controller for receiving an outcome of the measuring for defining the distances between the mobile station and the at least two base stations based on the outcome of the measuring and the characteristic parameter, and for determining a current geographical location of the mobile station based on the determined distances between the mobile station and the two base stations; wherein the feature of the signal is based on travel time or travel time difference of the signal between the mobile station and the at least two base stations. - View Dependent Claims (11, 12, 13, 14)
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15. A location server for use in a telecommunications system for provision of location data of a mobile station having a radio connection with at least two base stations of the telecommunications system, comprising:
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means for receiving measurement data from the telecommunications system concerning a feature of the connection between the mobile station and the at least two base stations for determination of distances between the mobile station and the at least two base stations; storage means for storing a characteristic parameter describing the line-of-sight conditions of the radio propagation environment of for the two at least two base stations, wherein the characteristic parameter describes excess path lengths caused by obstacles in the environment by means of one of a number of discrete levels; control means for defining the distances between the mobile station and the at least two base stations on the basis of the received measurement data and the characteristic parameter and for determining a current geographical location of the mobile station based on the determined distances between the mobile station and the at least two base stations; wherein the feature of the connection is based on travel time or travel time difference of the signal between the mobile station and the at least two base stations.
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16. An arrangement, comprising:
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a first station in a telecommunications system; a second station for communicating by radio with the first station in the telecommunications system; the arrangement configured to define a current geographical location of the first station with a source of location information that is external to the telecommunications system, to determine a feature of a radio signal received by one of the stations from two other stations, and to calculate a parameter describing line-of-sight conditions of a radio propagation environment according to the current geographical location of the first station and the determined feature, wherein the parameter describes excess path lengths caused by obstacles in the environment with one of a number of discrete levels; wherein the feature of the radio signal is based on travel time or travel time difference of the signal between the station and the other stations. - View Dependent Claims (17, 18, 19)
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Specification