Device and Method for AGPS High Accuracy Positioning in Unknown Cell Areas
First Claim
1. A method in a positioning node for providing a reference location estimate for Assisted Global Positioning System (AGPS) positioning of a portable communication device when the serving cell of the portable communication device is unknown to the positioning node, said method comprising:
- receiving from the portable communication device via a network node a data list of cells that are neighbors to the serving cell;
determining whether the location of any one of the neighbor cells is known to the positioning node;
determining whether there is a cell in the data list of cells that has the same Location Area Code (LAC) as the serving cell of the portable communication device, based on whether the location of any one of the neighbor cells is known to the positioning node;
identifying a fixed point of location within a geographical area that is being served by the positioning node, based on whether the location of any one of the neighbor cells is known to the positioning node, and based on whether there is a cell in the data list of cells that has the same LAC as the serving cell of the portable communication device; and
setting the reference location estimate for AGPS positioning of the portable communication device, based at least on whether the location of any one of the neighbor cells is known to the positioning node.
4 Assignments
0 Petitions
Accused Products
Abstract
The present invention relates to Assisted Global Positioning System (AGPS) high accuracy positioning in unknown cell areas. By using an approach of three alternative steps a reference position, needed for AGPS positioning, is determined. The first step involves using the location of any neighboring cell. The second involves using the location of a cell within the same Location Area as the cell serving the portable communication device to position. The third step comprises determining a fixed point within the same geographical area as the Serving Mobile Location Center (SMLC) is serving, and using this fixed point as a reference location. Using the three-step approach the AGPS positioning can be optimized, providing a possibility to position, for instance a mobile phone, by AGPS even though the location of the cell serving the phone is unknown to the positioning node operating the serving cell.
-
Citations
20 Claims
-
1. A method in a positioning node for providing a reference location estimate for Assisted Global Positioning System (AGPS) positioning of a portable communication device when the serving cell of the portable communication device is unknown to the positioning node, said method comprising:
-
receiving from the portable communication device via a network node a data list of cells that are neighbors to the serving cell; determining whether the location of any one of the neighbor cells is known to the positioning node; determining whether there is a cell in the data list of cells that has the same Location Area Code (LAC) as the serving cell of the portable communication device, based on whether the location of any one of the neighbor cells is known to the positioning node; identifying a fixed point of location within a geographical area that is being served by the positioning node, based on whether the location of any one of the neighbor cells is known to the positioning node, and based on whether there is a cell in the data list of cells that has the same LAC as the serving cell of the portable communication device; and setting the reference location estimate for AGPS positioning of the portable communication device, based at least on whether the location of any one of the neighbor cells is known to the positioning node. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10)
-
-
11. A positioning node for providing a reference location estimate for Assisted Global Positioning System (AGPS) positioning of a portable communication device, when the serving cell of the portable communication device is unknown to the positioning node, said positioning node comprising:
-
a transceiving unit configured to receive a request for a data list of cells that are neighbors to the serving cell, from a network node; a processing unit configured to determine whether the location of any one of the neighbor cells is known to the positioning node, to determine whether there is a cell in the data list of cells that has the same Location Area Code (LAC) as the serving cell of the portable communication device, based on whether the location of any one of the neighbor cells is known to the positioning node; and an identifying unit configured to identify a fixed point of location within a geographical area that is being served by the positioning node, based on whether the location of any one of the neighbor cells is known to the positioning node, and based on whether there is a cell in the data list of cells that has the same LAC as the serving cell of the portable communication device control unit; wherein the processing unit further is configured to set the reference location estimate for AGPS positioning of the portable communication device, based at least on whether the location of the base station of any one of the neighbor cells is known to the positioning node. - View Dependent Claims (12, 13, 14, 15, 16, 17, 18, 19, 20)
-
Specification