Call maintainance during position location

Patent 6211820 Issued on April 3, 2001. Estimated Expiration Date:

September 9, 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

Position aided subscriber unit for a satellite cellular system
Patent #: 5119504
Issued on: 06/02/1992
Inventor: Durboraw, III

Separated GPS sensor and processing system for remote GPS sensing and centralized ground station processing for remote mobile position and velocity determinations
Patent #: 5420592
Issued on: 05/30/1995
Inventor: Johnson

Fast forward link power control in a code division multiple access system
Patent #: 5461639
Issued on: 10/24/1995
Inventor: Wheatley, III, et al.

GPS receiver and method for processing GPS signals
Patent #: 5663734
Issued on: 09/02/1997
Inventor: Krasner

Cellular telephone with voice-in-data modem
Patent #: 5726893
Issued on: 03/10/1998
Inventor: Schuchman, et al.

Method of transmission power control in a cellular mobile communication system and apparatus thereof
Patent #: 5771451
Issued on: 06/23/1998
Inventor: Takai, et al.

GPS receiver using a message system for reducing power consumption
Patent #: 5883594
Issued on: 03/16/1999
Inventor: Lau

Method and apparatus for a global positioning data service
Patent #: 5999125
Issued on: 12/07/1999
Inventor: Kurby

Mobile location estimation in a wireless system using designated time intervals of suspended communication Patent #: 6021330
Issued on: 02/01/2000
Inventor: Vannucci

Inventors

Application

No. 150075 filed on 09/09/1998

US Classes:

342/357.1, Combined with telecommunication342/457, Land vehicle location (e.g., bus, police car455/456.2, Based on request signal455/456.6At remote station (i.e., mobile station)

Examiners

Primary: Issing, Gregory C.

Attorney, Agent or Firm

Greenhaus; Bruce, Brown; Charles, Wadsworth; Philip

Foreign Patent References

9825157 WO 06/12/1998
9838522 WO 09/12/1998

International Classes

G01S 005/14
H04B 007/26

Abstract

The present invention is a novel and improved method and apparatus for performing position location in wireless communications system. In one embodiment the invention comprises a method for performing position location in a subscriber unit in a CDMA wireless communications system having a base station, including the step of receiving a position location request during a communication, entering a position location mode, transmitting frames to the base station while performing a position location procedure, and returning to communications mode when said position location procedure has been completed.

Other References

Article Entitled "Global Postioning System Overview", by Dana, published on website at www.host.cc.utexas.edu, Sep. 1994 revised Feb. 15, 1998 pp. 1-12
Article entitled "Spread Spectrum Code Acquisitiojn In the Presence of Doppler Shift and Data Modulation", by Cheng et al., IEEE Transactions on Comm., vol. 38 No. 2 Feb. 1990 pp. 241-250
Understanding GPS Principles and Applications,/Kaplan, Elliott D.. Boston, MA: Artech House, c1996 Chapters 4 and 5
Boehm, K. et al, "An IF Digitizing Receiver for a Combined GPS/GSM Terminal", Radio and Wireless Conf. 1998, Rawcon 98 IEEE, Aug. 1998, pp. 39-4