Method for positioning a mobile station
First Claim
1. A method for locating a mobile station in a mobile telecommunication system comprising the steps of:
- using fixed transmitting stations for positioning a target mobile station by transmitting a location signal from each fixed transmitting station to said target mobile station and receiving a response to said location signal from said target mobile station by said fixed transmitting stations,using at least one relay station which is configured to receive said location signal from the corresponding fixed transmitting station and said response from said target mobile station, and to forward said location signal and said response to said target mobile station and said fixed transmitting stations, respectively, in case a direct transmission from or to at least one of said fixed transmitting stations is not available,determining a position of said at least one relay station,determining a distance between said target mobile station and the fixed transmitting stations and/or the at least one relay station on a basis of said location signal, andlocating a position of said target mobile station on a basis of the determined distances,wherein said at least one relay station is a movable mobile station, and wherein a distance D between said at least one relay station and said target mobile station is calculated based on the following equation
D=cΔ
t+β
dmax,wherein c is a light velocity, Δ
t is a propagation delay of the location signal, β
is in a range from −
1 to +1, and dmax is a maximum distance by which the at least one relay station can move during Δ
t.
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Accused Products
Abstract
The present invention is directed to a method for locating a mobile station, comprising the steps of using fixed transmitting stations for locating a target mobile station by transmitting a measurement signal from each fixed transmitting station to the mobile station, using a relay station which is adapted to receive the measurement signal from the corresponding fixed transmitting station and to forward the signal to the target mobile station, in case a direct transmission from one or more of the fixed transmitting stations is not available, and determining the distance between the target mobile station to the fixed transmitting stations and/or the relay stations on the basis of the measurement signal, and locating the position of the target mobile station on the basis of the determined distances. By this method, it is possible to locate a mobile station even if there is no direct connection via air to neighbouring base stations.
107 Citations
18 Claims
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1. A method for locating a mobile station in a mobile telecommunication system comprising the steps of:
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using fixed transmitting stations for positioning a target mobile station by transmitting a location signal from each fixed transmitting station to said target mobile station and receiving a response to said location signal from said target mobile station by said fixed transmitting stations, using at least one relay station which is configured to receive said location signal from the corresponding fixed transmitting station and said response from said target mobile station, and to forward said location signal and said response to said target mobile station and said fixed transmitting stations, respectively, in case a direct transmission from or to at least one of said fixed transmitting stations is not available, determining a position of said at least one relay station, determining a distance between said target mobile station and the fixed transmitting stations and/or the at least one relay station on a basis of said location signal, and locating a position of said target mobile station on a basis of the determined distances, wherein said at least one relay station is a movable mobile station, and wherein a distance D between said at least one relay station and said target mobile station is calculated based on the following equation
D=cΔ
t+β
dmax,wherein c is a light velocity, Δ
t is a propagation delay of the location signal, β
is in a range from −
1 to +1, and dmax is a maximum distance by which the at least one relay station can move during Δ
t. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10)
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11. A radio network of a mobile telecommunication system, comprising:
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fixed transmitting stations which are configured for positioning a target mobile station by transmitting a location signal from each fixed transmitting station to said target mobile station and receiving a response to said location signal from said target mobile station by said fixed transmitting stations, at least one relay station which is configured to receive said location signal from the corresponding fixed transmitting station and said response from said target mobile station, and to forward said signals to said target mobile station and said fixed transmitting station, respectively, in case a direct transmission from and to at least one of said fixed transmitting stations is not available, and location means for determining a position of the at least one relay station and determination means for determining a distance between said target mobile station and the fixed transmitting stations and/or the at least one relay station on a basis of said location signal, and wherein the location means is configured to locate the position of said target mobile station on a basis of the determined distances, said at least one relay station is a movable mobile station, and said determination means calculates said distance D between said at least one relay station and said target mobile station based on the following equation
D=cΔ
t β
dmax,wherein c is the light velocity, Δ
t is a propagation delay of the location signal, β
is in a range from −
1 to +1, and dmax is a maximum distance by which the at least one relay station can move during Δ
t. - View Dependent Claims (12, 13, 14, 15, 16, 17, 18)
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Specification