Call maintainance during position location

• US 6,211,820 B1
• Filed: 09/09/1998
• Issued: 04/03/2001
• Est. Priority Date: 09/09/1998
• Status: Expired due to Term

• Current Assignee: Qualcomm, Inc.
• Original Assignee: Qualcomm, Inc.
• Inventors: Sih, Gilbert C., Zou, Qiuzhen, Edmonston, Brian S.
• Primary Examiner(s): Issing, Gregory C.
• Application Number:
  US09/150,075
• Time in Patent Office: 937 Days
• Field of Search: 342/357.09, 342/357.1, 342/357.12, 342/357.13, 342/357.17, 342/457, 455/456, 455/522
• US Class Current: 342/357.4
• CPC Class Codes: G01S 19/235 Calibration of receiver components
• CPC Class Codes: G01S 19/246 involving long acquisition integration times, extended snapshots of signals or methods specifically directed towards weak signal acquisition
• CPC Class Codes: G01S 19/254 relating to Doppler shift of satellite signals
• CPC Class Codes: G01S 19/256 relating to timing, e.g. time of week, code phase, timing offset
• CPC Class Codes: G01S 19/29 carrier including Doppler, related G01S19/246 takes precedence
• CPC Class Codes: G01S 19/30 code related G01S19/246 takes precedence
• CPC Class Codes: G01S 2205/008 using a mobile telephone network
• CPC Class Codes: G01S 5/0036 of measured values, i.e. measurement on mobile and position calculation on base station
• CPC Class Codes: G01S 5/0063 of measured values, i.e. measurement on base station and position calculation on mobile

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.

Claims

1. A method for performing position location in a subscriber unit in a CDMA wireless communications system having a base station, comprising the steps of:

receiving a position location request from the base station;

in response to the position location request, tuning a receiver of the subscriber unit away from the current frequency to a position location frequency in order to receive position location information; and

receiving information over the position location frequency and using the received information to perform a position location procedure, while transmitting information to the base station;

retuning the receiver to once again receive from, as well as transmit to the base station when said position location procedure has been completed.

2. The method of claim 1, wherein the information received from the subscriber unit during the position location procedure contains power control information.

3. The method of claim 1, wherein the information received from the subscriber unit during the position location procedure notifies the base station that the subscriber unit is position location mode.

4. The method of claim 1, wherein the information received from the subscriber unit during the position location procedure notifies the base station of a status of the position location procedure.

5. The method of claim 1, wherein the information received from the subscriber unit during the position location procedure includes a request for additional aiding information for performing the position location procedure, and the position location procedure is completed using the additional aiding information.

6. The method of claim 1 wherein information received from the subscriber unit during the position location procedure contains timing information.

7. The method as set forth in claim 1, wherein the information received from the subscriber unit during the position location procedure is used for conducting communications.

8. The method as set forth in claim 1, wherein the information received from the subscriber unit during the position location procedure is transmitted after signal samples from a set of satellites are collected, but before the position location procedure in completed.