Smart subdivision of base station candidates for position location accuracy
AssigneeTelefonaktiebolaget LM Ericsson
InventorsHans George Grubeck, Bengt Bengkvist
Life of this patent
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Abstract
In a cellular telephone system of the type having the capability of making measurements useful in determining the location of a mobile station, at least one such measurement is made. The measurement is made in accordance with a cost function which minimizes the costs to the systems. A position fix of the mobile station is determined using the cost function and the measurement.
Claims31
A method for determining the position of a mobile station whose approximate location is known in a cellular telephone system having a plurality of base stations with known locations, which comprises:
- defining a function, which describes the cost of performing positioning measurements within the system involving system resources including a certain subset of base stations and a certain channel for positioning measurements;
- selecting a subset of base stations and a channel, which minimizes the cost of the resources within the system when performing the positioning measurements;
- assigning the mobile station to said channel;
- performing the positioning measurements relating to the position of the mobile station from said selected set of base stations having known locations on said channel;
- and
- obtaining a position fix estimate within a required degree of accuracy based upon said positioning measurements.
A positioning system for a cellular telephone system having a plurality of base stations with known locations and at least one mobile station whose approximate location is known, which comprises:
- means for defining a function, which describes the cost of performing positioning measurements within the system involving system resources including a certain subset of base stations and a certain channel for positioning measurements;
- means for selecting a subset of base stations and a channel, which minimizes the cost of the resources within the system when performing the positioning measurements;
- means for assigning the mobile station to said channel;
- means for performing positioning measurements relating to the position of the mobile station from said selected set of base stations having known locations on said channel;
- and
- means for obtaining a position fix estimate within a required degree of accuracy based upon said positioning measurements.
Dependencies are inferred from the claim text.