Assisted method of locating mobile communications terminals of a cellular network using a USSD transport channel
First Claim
1. A method of locating mobile communications terminals (T) each comprising an assisted satellite positioning device (D), adapted to be connected to a satellite positioning installation (CS) connected to an assistance data server (SDA), which method is characterized in that, in the event of a location request from a mobile terminal (T), it sets up a USSD transport channel between the device (D) of said terminal and a location management equipment (EGL) of the parent cellular network of said terminal connected to said server (SDA) and then sends said terminal (T) via said USSD transport channel assistance data representative of identifiers of at least three satellites (SN) visible in the cell in which it is situated with the result that its device (D) locks onto said satellites (SN) in order to estimate each distance between a satellite and its terminal (T) with a view to determining the position of the terminal.
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Accused Products
Abstract
A mobile communications terminal (T) for a cellular communications network comprises an assisted satellite positioning device (D) connected to a satellite positioning installation connected to an assistance data server, a USSD management module (MGT) for setting up USSD transport channels, and a processor (MT) for coupling the management module (MGT) to the device (D) on request in order for a USSD transport channel to be set up between the device (D) and a location management equipment of the cellular network connected to the assistance data server. The USSD channel is then used to send the device (D) assistance data representative of identifiers of at least three satellites visible in the cell in which the terminal (T) is situated so that it can lock onto said satellites to estimate at least the distances between the satellites and its terminal (T).
15 Citations
15 Claims
- 1. A method of locating mobile communications terminals (T) each comprising an assisted satellite positioning device (D), adapted to be connected to a satellite positioning installation (CS) connected to an assistance data server (SDA), which method is characterized in that, in the event of a location request from a mobile terminal (T), it sets up a USSD transport channel between the device (D) of said terminal and a location management equipment (EGL) of the parent cellular network of said terminal connected to said server (SDA) and then sends said terminal (T) via said USSD transport channel assistance data representative of identifiers of at least three satellites (SN) visible in the cell in which it is situated with the result that its device (D) locks onto said satellites (SN) in order to estimate each distance between a satellite and its terminal (T) with a view to determining the position of the terminal.
- 10. A mobile communications terminal (T) for a cellular communications network, comprising an assisted satellite positioning device (D) adapted to be connected to a satellite positioning installation (CS) connected to an assistance data server (SDA), the terminal being characterized in that it comprises USSD management means (MGT) adapted to establish USSD transport channels and processing means (MT) adapted to connect said USSD management means (MGT) to said device (D) on request in order for a USSD transport channel to be set up between said device and a location management equipment (EGL) of said cellular network connected to said server (SDA) to enable sending to said device via said USSD transport channel of assistance data representative of identifiers of at least three satellites (SN) visible in the cell in which said terminal (T) is situated in order for it to lock onto said satellites (SN) to determine the distances between them and its terminal (T).
Specification