Location method for mobile netwoks
First Claim
1. A method for locating mobile terminals in a mobile network, the method comprising the steps of:
- receiving location-dependent parameter sets, each parameter set to include at least one parameter indicative of the location of an individual mobile terminal;
on the basis of the parameter sets, forming a transition network comprising nodes interconnected by links, wherein (1) an individual node represents a parameter set having a given parameter content, (2) a link connecting two neighboring nodes represents a transition between two successive estimated locations of a mobile terminal, and (3) the node coordinates relate to a certain location;
adjusting the coordinates of a node responsive to coordinates of neighboring nodes directly connected to said node through a link, whereby said adjusting is performed for at least some of the nodes of the transition network;
for a selected set of nodes, limiting movement of the node within the transition network and using the coordinates of the node representing a parameter set received to indicate a location estimate for said parameter set.
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Accused Products
Abstract
The invention concerns locating mobile terminals in a mobile network. A location estimate is determined based on a parameter set received from the mobile network. In order to improve the accuracy of the system without a need for extensive prior field measurements or laborious data collection, a transition network is formed based on parameter sets. In said network an individual node represents a parameter set having a given parameter content, a link connecting two neighboring nodes represents a transition between two successive locations of a mobile terminal, and the position of a node relates to a certain geographical location. The transition network is then optimized by adjusting the positions of the nodes by means of the positions of their neighboring nodes and the movement within the network of some of the nodes is limited. The position of the node representing a parameter set received indicates the location of a mobile.
78 Citations
13 Claims
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1. A method for locating mobile terminals in a mobile network, the method comprising the steps of:
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receiving location-dependent parameter sets, each parameter set to include at least one parameter indicative of the location of an individual mobile terminal;
on the basis of the parameter sets, forming a transition network comprising nodes interconnected by links, wherein (1) an individual node represents a parameter set having a given parameter content, (2) a link connecting two neighboring nodes represents a transition between two successive estimated locations of a mobile terminal, and (3) the node coordinates relate to a certain location;
adjusting the coordinates of a node responsive to coordinates of neighboring nodes directly connected to said node through a link, whereby said adjusting is performed for at least some of the nodes of the transition network;
for a selected set of nodes, limiting movement of the node within the transition network and using the coordinates of the node representing a parameter set received to indicate a location estimate for said parameter set. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 13)
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12. A system for locating mobile terminals in a mobile network, the system comprising:
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first means for receiving parameter sets, each parameter set comprising at least one parameter indicative of the location of an individual mobile terminal, second means for finding a location estimate for a parameter set received, the location estimate indicating the location of the respective mobile terminal, third means for forming a transition network on the basis of the parameter sets, the transition network comprising nodes interconnected by links, whereby (1) an individual node represents a parameter set having a given parameter content, (2) a link connecting two neighboring nodes represents a transition between two successive locations of a mobile terminal, and (3) the node coordinates relate to a certain location, fourth means for adjusting the coordinates of a node by means of the coordinates of the nodes directly connected to said node through a link, and fifth means for limiting the movement of at least one of the nodes within the transition network, wherein the second means are adapted to use the coordinates of the node representing a received parameter set to indicate the location estimate for said parameter set.
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Specification