Dynamic tag control and fingerprinting event localization

Patent metadata

Field	Value
Publication number	US-9414291-B2
Application number	US-200913265865-A
Country	US
Kind code	B2
Filing date	Apr 27, 2009
Priority date	Apr 27, 2009
Publication date	Aug 9, 2016
Grant date	Aug 9, 2016

Abstract

In a method for clustering position determination for providing position determination assisting data in a cellular communications network, detecting S 1 an event, such as the occurrence of an emergency call or sudden drop in radio quality, providing a tag S 2 for the detected event comprising event specific information. Subsequently, providing S 3 high precision position measurements the said tagged detected event, and repeating S 4 said detecting and providing steps a plurality of times. Finally, obtaining local clusters S 5 of high-precision position measurements based on the event specific tag.

First claim

The invention claimed is:

1. A method of clustering position determination for providing position determination assisting data in a cellular communication network, comprising:
detecting, by a radio network controller (RNC), an event;
providing, by the RNC, a tag for the detected event, the tag comprising event-specific information and a time;
providing, by the RNC, high-precision position measurements for the detected event;
repeating, by the RNC, the detecting and providing steps a plurality of times;
obtaining, by the RNC, a local event cluster of high-precision position measurements based on the tag; and
tracking, by the RNC, a movement of the local event cluster by determining a geographical position by calculating a center of gravity of the local event cluster, generating, by the RNC, an updated local event cluster by removing a high-precision measurement from the local event cluster when an age of the high-precision measurement is greater than a predetermined threshold, and determining a geographical position of the updated local event cluster by recalculating the center of gravity.

2. The method of claim 1 , wherein providing the tag comprises replacing an available tag with the tag comprising the event-specific information.

3. The method of claim 1 , wherein providing the tag comprises adapting an available tag by at least adding the event-specific information.

4. The method of claim 1 , wherein the tag is provided in response to a detected predetermined event.

5. The method of claim 4 , wherein the predetermined event comprises an emergency call, and the tag comprises emergency call information.

6. The method of claim 4 , wherein obtaining a local event cluster comprises initiating a tentative event cluster including the detected predetermined event, searching for identical events originating close to the tentative event cluster, and adding tags and high-precision position measurements associated with found identical events to the tentative event cluster.

7. The method of claim 6 , comprising initiating a local event cluster including the tentative event cluster when a number of identical events of the tentative event cluster reaches a set threshold.

8. The method of claim 1 , wherein the event comprises a dropped call; providing the tag comprises monitoring a predetermined radio quality parameter; and the tag is provided when the predetermined radio quality parameter reaches a predetermined minimum threshold.

9. The method of claim 8 , wherein obtaining a local event cluster comprises initiating a tentative event cluster including the tag and corresponding high-precision measurement, and adding tagged events to the tentative event cluster as the tagged events are provided.

10. The method of claim 9 , comprising initiating a local event cluster including the tentative event cluster when a number of tagged events of the tentative event cluster reaches a set threshold.

Assignees

• Wigren Karl Torbjörn
• ERICSSON TELEFON AB L M (publ)

Inventors

• Wigren Karl Torbjörn

Classifications

• H04W36/385 Primary

  of the core network · CPC title