Method for locating mobile station in distributed manner
First Claim
1. A method for locating a mobile station in a distributed manner using radio signals between the mobile station and mobile network, comprising steps:
- obtaining differences of propagation times of signals propagating between the mobile station and other stations of the mobile network;
performing a locating process by location computing based on said differences of signal propagation time;
wherein said location computing includes steps of;
distributing the computing between a mobile network element and the mobile station by dividing the location computing into operation sequences by forming a first set of operation sequences and a second set of operation sequences separated by an execution boundary therebetween, said execution boundary being dynamically set between any location computing operations; and
carrying out said first set of operation sequences in a mobile station and carrying out said second set of operation sequences in the mobile network element.
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Abstract
The invention relates to a method for locating a mobile station (1) by means of the mobile station (1) and a location service center (LSC) (5) in the mobile network by dynamically distributing the computing between these two. Preferably the mobile station (1) measures impulse responses of received bursts to determine time differences, and preprocesses measurement results. The location service center (5) performs the final processing. According to the invention, dummy bursts are also used in the locating process. The method also includes an automatic locating procedure activated in conjunction with an emergency call.
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Citations
19 Claims
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1. A method for locating a mobile station in a distributed manner using radio signals between the mobile station and mobile network, comprising steps:
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obtaining differences of propagation times of signals propagating between the mobile station and other stations of the mobile network;
performing a locating process by location computing based on said differences of signal propagation time;
wherein said location computing includes steps of;
distributing the computing between a mobile network element and the mobile station by dividing the location computing into operation sequences by forming a first set of operation sequences and a second set of operation sequences separated by an execution boundary therebetween, said execution boundary being dynamically set between any location computing operations; and
carrying out said first set of operation sequences in a mobile station and carrying out said second set of operation sequences in the mobile network element. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16)
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17. A method for locating a mobile station in a distributed manner using radio signals between the mobile station and mobile network, comprising steps:
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obtaining differences of propagation times of signals propagating between the mobile station and other stations of the mobile network;
performing a locating process by location computing based on said differences of signal propagation time;
wherein said location computing includes steps of;
distributing the computing between a mobile network element and the mobile station by dividing the location computing into operation sequences by forming a first set of operation sequences and a second set of operation sequences separated by an execution boundary therebetween, said execution boundary being dynamically set between any location computing operations; and
carrying out said first set of operation sequences in a mobile station and carrying out said second set of operation sequences in the mobile network element;
wherein the distribution of locating between the mobile network and the mobile station is dynamically changed by moving an operation sequence execution boundary. - View Dependent Claims (18)
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19. A method for locating a mobile station in a distributed manner using radio signals between the mobile station and mobile network, comprising steps:
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obtaining differences of propagation times of signals propagating between the mobile station and other stations of the mobile network;
performing a locating process by location computing based on said differences of signal propagation time;
wherein said location computing includes steps of distributing the computing between a mobile network element and the mobile station by dividing the location computing into operation sequences; and
carrying out those operation sequences in the mobile network element and in the mobile station;
wherein, to determine time differences, different burst training sequences are compared by correlation with received signal, and an impulse response obtained as a result of that correlation is used for determining whether the training sequence is correct.
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Specification