GPS assistance data for positioning of mobiles with built-in GPS
First Claim
1. A method of positioning a global positioning system mobile station (GPS-MS) served by a serving node in a wireless communications network and a GPS satellite network, comprising the steps of:
- a) determining a location cell that the GPS-MS resides;
b) determining a relationship between an air interface time at the location cell and an absolute GPS time;
c) providing range measurement assistance data that is associated with the air interface time to the GPS-MS as a function of the determined location cell;
d) the GPS-MS obtaining GPS measurement data from the GPS satellites as a function of the received range measurement assistance data; and
e) at a mobile location node remotely located from the serving node, calculating the position of the GPS-MS as a function of the GPS measurement data and the relationship of time determined in step b).
3 Assignments
0 Petitions
Accused Products
Abstract
A wireless communication network and methodology providing GPS assistance data for positioning of mobiles with built-in GPS receivers (GPS-MS). The system and methodology includes obtaining a site location of the BTS currently serving a GPS-MS to be located, as well as obtaining the air interface time in relation to the absolute GPS time at the BTS currently serving the GPS-MS. Knowing the geographical location of the BTS currently serving the GPS-MS, range measurement assistance data is provided with a time of calculation to the GPS-MS. This information is used by the GPS-MS to obtain GPS measurement data at the indicated time of calculation using this a priori information. The GPS-MS obtains GPS measurement data based on the a priori information quickly, and returns the GPS assistance data to a mobile location center (MLC) which ultimately determines the position of the GPS-MS. The MLC has ephermis data, and converts the air interface time to the absolute GPS time for calculation of the GPS-MS position. Minimal traffic across the wireless network is required, and the position of the GPS-MS can be quickly obtained.
134 Citations
19 Claims
-
1. A method of positioning a global positioning system mobile station (GPS-MS) served by a serving node in a wireless communications network and a GPS satellite network, comprising the steps of:
-
a) determining a location cell that the GPS-MS resides;
b) determining a relationship between an air interface time at the location cell and an absolute GPS time;
c) providing range measurement assistance data that is associated with the air interface time to the GPS-MS as a function of the determined location cell;
d) the GPS-MS obtaining GPS measurement data from the GPS satellites as a function of the received range measurement assistance data; and
e) at a mobile location node remotely located from the serving node, calculating the position of the GPS-MS as a function of the GPS measurement data and the relationship of time determined in step b). - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
-
-
9. A method of positioning a global positioning system mobile station (GPS-MS) served by a base transceiver station (BTS) in a wireless communication network having a mobile switching center (MSC), a mobile location center (MLC) associated with the MSC, and a location mobile unit (LMU) associated with the BTS, the wireless communication network operable with a network of GPS satellites, comprising the steps of:
-
a) the MLC identifying the BTS currently serving the GPS-MS and obtaining the air interface time at the serving BTS;
b) the MLC providing range measurement assistance data to the GPS-MS as a function of the obtained air interface time at the serving BTS;
c) the GPS-MS obtaining GPS measurement data as a function of the range measurement assistance data, the GPS-MS providing the GPS measurement data to the MLC; and
d) the MLC calculating the GPS-MS position as a function of the received GPS measurement data and as a function of the obtained air interface time and the absolute time. - View Dependent Claims (10, 11, 12, 13)
-
-
14. A wireless communications network adapted to communicate with a mobile communication station having a GPS receiver (GPS-MS), the network operable with satellites of a GPS system, comprising;
-
a serving node adapted to serve the GPS-MS, said serving node having an air interface time; and
a mobile location node remotely located from the serving node, said mobile location node having;
means to obtain an absolute time;
means to obtain the air interface time at the serving node;
means to provide range measurement assistance data to the GPS-MS as a function of the obtained air interface time; and
position means to calculate a position of the GPS-MS as a function of GPS measurement data provided by the GPS-MS based on the air interface time and as a function of the absolute time. - View Dependent Claims (15, 16, 17, 18, 19)
-
Specification