Methods and arrangements for fingerprinting positioning

摘要

A method for providing position determination assisting data comprises repetitions of establishing (210) of a cell relation configuration for a user equipment and performing (212) of a high-precision position determination for the user equipment. Results of the determinations belonging to the same cell relation configuration are clustered (214) in separate clustered results. An area definition is associated (220) with the clustered results by enclosing (221) the clustered results by a polygon, shrinking (222) the polygon by moving corners towards a contraction point and defining (223) the area definition as a shrunk polygon comprising a predetermined fraction of the clustered results. The contraction point is selected to be situated within the clustered results. The method also comprises creating (230) of position determination assisting data comprising a relation between the cell relation configurations and the associated area definitions. An arrangement for providing position determination assisting data is also presented.

主权项

1. A method for providing position determination assisting data for adaptive enhanced cell-ID positioning purposes in a cellular communications network, comprising:
for each of a plurality of times, establishing a cell relation configuration for a user equipment and performing a high-precision position determination for said user equipment; clustering results of different ones of said high-precision position determinations that belong to different cell relation configurations into separate clusters of results, wherein any given one of said clusters includes results of one or more of said high-precision position determinations that belong to the same cell relation configuration; associating an area definition with each of one or more of said clusters by:
enclosing the results of the cluster within a polygon;shrinking said polygon by moving polygon corners towards a contraction point distinct from a total centre of gravity of all results of the cluster, wherein said contraction point is a local centre of gravity of a subset of the results of the cluster, said subset being a predetermined amount of those results of the cluster that are situated closest to a total centre of gravity of all results of the cluster, and wherein said contraction point is always selected to be situated in the interior of the cluster and is locally surrounded by individual results of the cluster; anddefining the area definition associated with the cluster as a shrunk polygon comprising a predetermined fraction of the results of the cluster; and creating position determination assisting data comprising a relation between said cell relation configurations and said associated area definitions.