Area based position determination for terminals in a...

Details Area based position determination for terminals in a... Area based position determination for terminals in a...

H - Electricity

04

W

H04W 64/00 (2009.01) G01S 5/14 (2006.01) G01S 5/02 (2006.01)

Patent

CA 2495023

Techniques to estimate the position of a wireless terminal. In a method, the identities of a number of transmitters (e.g., BTSs) to be used to estimate the position are initially received. Expected areas for these transmitters are then determined. The expected area associated with each transmitter is indicative of an area where the terminal is likely to be located given that the signal from the transmitter is received by the terminal. Each expected area may comprise a location (e.g., the expected area center) to be used as an estimated position of the terminal and an uncertainty (or error estimate) associated with that estimated position. The expected areas for the transmitters are then combined (e.g., based on a weighted average) to determine a combined expected area, which is then provided as the estimate of the position of the terminal.

L'invention concerne des techniques permettant d'estimer la position d'un terminal sans fil. Un procédé consiste à recevoir, dans un premier temps, les identités d'un certain nombre d'émetteurs (par exemple, des BTSs) utilisés pour estimer la position. Des zones prévues pour ces émetteurs sont alors déterminées. La zone prévue associée à chaque émetteur indique une zone où le terminal peut éventuellement être situé, le signal de l'émetteur étant reçu par le terminal. Chaque zone prévue peut comprendre un emplacement (par exemple, le centre de la zone prévue) destiné à être utilisé comme la position estimée du terminal, et une incertitude (ou erreur d'estimation) associée à la position estimée. Les zones prévues pour les émetteurs sont alors combinées (par exemple, selon une moyenne pondérée) afin de déterminer une zone prévue combinée servant alors d'estimation de la position du terminal.

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