GPS assistance data for positioning of mobiles with built-in GPS

Patent 6266533 Issued on July 24, 2001. Estimated Expiration Date:

December 11, 2018. Estimated Expiration Date is calculated based on simple USPTO term provisions. It does not account for terminal disclaimers, term adjustments, failure to pay maintenance fees, or other factors which might affect the term of a patent.

Abstract Claims Description Full Text

Patent References

Reduced global positioning system receiver code shift search space for a cellular telephone system
Patent #: 6070078
Issued on: 05/30/2000
Inventor: Camp, Jr., et al.

Method for calculating a location of a remote Unit utilizing observed time difference (OTD) and real time difference (RTD) measurements. Patent #: 6108558
Issued on: 08/22/2000
Inventor: Vanderspool, II

Inventors

Assignee

Ericsson Inc.

Application

No. 209351 filed on 12/11/1998

US Classes:

455/456.2, Based on request signal342/357.03Using differential correction

Examiners

Primary: Maung, Nay
Assistant: Persino, Raymond B.

Attorney, Agent or Firm

Navarro; Arthur I.

International Classes

H04Q 007/20
H04B 007/185

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.