Method to localize a mobile telephone
First Claim
Patent Images
1. A method for the localizing of a mobile telephone in a network of base transceiver stations comprising the following steps:
- a first, second and third base transceiver station are located,a first, second and third duration of propagation between the first, second and third base transceiver stations and the mobile telephone are measured respectively,the distances between this first, second and third base transceiver stations and the mobile telephone are deduced therefrom, andthe mobile telephone is localized with these distances and these locations of base transceiver stations,wherein,one and the same absolute clock is made known in order to set the times of the base transceiver stations,the first base transceiver station sends a first piece of information h1 of an absolute date to the mobile telephone, this first information h1 corresponding to a first absolute date H1 for this first base transceiver station,the mobile telephone receives this first piece of information h1 of absolute date and, after a period of waiting known to the first base transceiver station, it sends a response signal,the first base transceiver station receives this response signal at another absolute date H'"'"'1,the first base transceiver station computes a piece of information on propagation τ
1 between itself and the mobile telephone on the basis of the difference between the two absolute dates H1 and H'"'"'1 and of the known waiting duration,the first base transceiver station sends the mobile telephone the piece of information on propagation τ
1,the second and third base transceiver stations send a second piece of information and third piece of information h2 and h3 on absolute date, andthe mobile telephone is localized on the basis of these pieces of information h1, h2, h3 on absolute date received by the mobile telephone, their reception date and the information on propagation.
6 Assignments
0 Petitions
Accused Products
Abstract
To enable the localizing of a mobile telephone in a network of base transceiver stations, it is planned that the mobile telephone will undertake an exchange with a base transceiver station. In this exchange, this station will send it an absolute time so that the mobile telephone can temporarily locate itself with respect to this absolute time. During this exchange, the first base transceiver station furthermore sends the mobile telephone a piece of information τ1 on the distance between them. Then, at least two other base stations send different absolute times which are exploited by the mobile telephone to compute its position in the network by triangulation.
-
Citations
13 Claims
-
1. A method for the localizing of a mobile telephone in a network of base transceiver stations comprising the following steps:
-
a first, second and third base transceiver station are located, a first, second and third duration of propagation between the first, second and third base transceiver stations and the mobile telephone are measured respectively, the distances between this first, second and third base transceiver stations and the mobile telephone are deduced therefrom, and the mobile telephone is localized with these distances and these locations of base transceiver stations, wherein, one and the same absolute clock is made known in order to set the times of the base transceiver stations, the first base transceiver station sends a first piece of information h1 of an absolute date to the mobile telephone, this first information h1 corresponding to a first absolute date H1 for this first base transceiver station, the mobile telephone receives this first piece of information h1 of absolute date and, after a period of waiting known to the first base transceiver station, it sends a response signal, the first base transceiver station receives this response signal at another absolute date H'"'"'1, the first base transceiver station computes a piece of information on propagation τ
1 between itself and the mobile telephone on the basis of the difference between the two absolute dates H1 and H'"'"'1 and of the known waiting duration,the first base transceiver station sends the mobile telephone the piece of information on propagation τ
1,the second and third base transceiver stations send a second piece of information and third piece of information h2 and h3 on absolute date, and the mobile telephone is localized on the basis of these pieces of information h1, h2, h3 on absolute date received by the mobile telephone, their reception date and the information on propagation. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13)
-
Specification
-
- Resources
Litigation Campaign Assessment
Thank you for your request. You will receive a custom alert email when the Litigation Campaign Assessment is available.
×
-
Current AssigneeApple Inc.
-
Original AssigneeSagem SA (Safran SA)
-
InventorsPite, Eric
-
Primary Examiner(s)VO, NGUYEN THANH
-
Application NumberUS09/365,499Time in Patent Office512 DaysField of Search455/456, 455/457, 455/67.1, 455/422, 455/524, 342/450, 342/458, 342/463, 701/300US Class Current455/456.3CPC Class CodesH04W 64/00 Locating users or terminals...
