Method and apparatus for managing remote unit increased power transmission during location

• US 5,905,961 A
• Filed: 02/05/1997
• Issued: 05/18/1999
• Est. Priority Date: 02/05/1997
• Status: Expired due to Term

• Current Assignee: Google Technology Holdings LLC (Alphabet Inc.)
• Original Assignee: Motorola, Inc. (Motorola Solutions, Inc.)
• Inventors: Jayapalan, Jay P., Sanders, Stephen H. III
• Primary Examiner(s): Bost, Dwayne D.
• Assistant Examiner(s): GANTT, ALAN T
• Application Number:
  US08/795,528
• Time in Patent Office: 832 Days
• Field of Search: 455/456, 455/457, 455/500, 455/507, 455/524, 455/522, 455/571, 455/572, 455/67.1, 455/423, 455/425, 201/200, 201/207, 342/450, 342/451
• US Class Current: 455/456.2
• CPC Class Codes: G01S 5/14 Determining absolute distances from a plurality of spaced points of known location
• CPC Class Codes: H04W 64/00 Locating users or terminals or network equipment for network management purposes, e.g. mobility management

Abstract

Remote units (113) that require locating are managed by a queue controller (180) such that the number and location of remote units (113) that are transmitting at increased power at any given time is limited. In particular, a queue controller (180) places identification information for remote units (113) requiring location onto queues (203) associated with base stations supplying reference pilots to the remote units (113). Additionally, identification (ID) information for the remote units (113) requiring location is placed onto queues (203) associated with base stations neighboring the base stations supplying the reference pilot to the remote units (113). The queues (203) operate on a first-in-first-out (FIFO) basis, that output remote unit ID at periodic intervals. Once all queues (203) have been emptied of the ID of a particular remote unit (113), location takes place for that remote unit (113).

Claims

1. A method for locating a remote unit, the method comprising the steps of:

(a) determining a first base station and a second base station currently serving the remote unit;

(b) placing identification information regarding the remote unit onto a first buffer associated with the first base station;

(c) placing identification information regarding the remote unit onto a second buffer associated with the second base station;

(d) removing the identification information from the first buffer at a first time;

(e) removing the identification information from the second buffer at a second time, wherein the second time does not equal the first time; and

(f) locating the remote unit, wherein the step of locating the remote unit is based on identification information regarding the remote unit being removed from the first buffer and the second buffer.

2. The method of claim 1 wherein the step of removing the identification information from the second buffer at the second time comprises the step of removing the identification information from the second buffer at the second time, wherein the second time is based on a current traffic load.

3. The method of claim 1 wherein the step of removing the identification information from the second buffer at the second time comprises the step of removing the identification information from the second buffer at the second time, wherein the second time is based on a quality of service.

4. The method of claim 1 wherein the step of removing the identification information from the second buffer at the second time comprises the step of removing the identification information from the second buffer at the second time, wherein the second time is based on a maximum time allowed for the step of locating the remote unit to be performed.

5. The method of claim 1 wherein the step of locating the remote unit comprises the step of locating the remote unit by sending a command to the remote unit to increase a remote unit transmit power.

6. The method of claim 1 wherein the step of locating the remote unit comprises the step of locating the remote unit via trilateration.

7. A method for managing a location estimation of a first remote unit and a second remote unit, the method comprising the steps of:

placing identification information regarding the first remote unit onto a buffer;

placing identification information regarding the second remote unit onto the buffer;

removing the identification information regarding the first remote unit from the buffer;

locating the first remote unit, wherein the step of locating the first remote unit is based on the identification information regarding the first remote unit being removed from the buffer;

locking the buffer for a predetermined amount of time so that the identification information regarding the second remote unit cannot be removed from the buffer until the predetermined amount of time has passed;

removing the identification information regarding the second remote unit from the buffer, wherein the step of removing identification information regarding the second remote unit occurs after the predetermined amount of time has passed; and

locating the second remote unit, wherein the step of locating the second remote unit is based on the identification information regarding the second remote unit being removed from the buffer.

8. The method of claim 7 wherein the step of locking the buffer for a predetermined amount of time comprises the step of locking the buffer for a predetermined amount of time, wherein the predetermined amount of time is based on a current traffic load.

9. The method of claim 7 wherein the step of locking the buffer for a predetermined amount of time comprises the step of locking the buffer for a predetermined amount of time, wherein the predetermined amount of time is based on a maximum time allowed for the step of locating to be performed.

10. The method of claim 7 wherein the step of locking the buffer for a predetermined amount of time comprises the step of locking the buffer for a predetermined amount of time, wherein the predetermined amount of time is based on a quality of service.

11. The method of claim 7 wherein the step of locating the first remote unit comprises the step of locating the first remote unit by sending a command to the first remote unit to increase the remote unit transmit power.

12. A method for locating a remote unit, the method comprising the steps of:

determining a first base station and a second base station currently serving the remote unit;

determining if a step of locating the remote unit will negatively affect remote units served by the second base station;

placing identification information regarding the remote unit onto a first buffer associated with the first base station;

placing identification information regarding the remote unit onto a second buffer associated with the second base station only if locating the remote unit will negatively affect remote units served by the second base station;

removing the identification information from the first buffer at a first time;

removing the identification information from the second buffer at a second time only if locating the remote unit will negatively affect remote units served by the second base station; and

locating the remote unit, wherein the step of locating the remote unit is based on identification information regarding the remote unit not existing on the first and the second buffer.

13. The method of claim 12 wherein the step of determining if the step of locating the remote unit will negatively affect remote units served by the second base station comprises a step of determining if the remote unit is beyond a predetermined distance from the first base station.

14. The method of claim 12 wherein the step of removing the identification information from the second buffer at the second time comprises the step of removing the identification information from the second buffer at the second time, wherein the second time is based on a current traffic load.

15. The method of claim 12 wherein the step of removing the identification information from the second buffer at the second time comprises the step of removing the identification information from the second buffer at the second time, wherein the second time is based on a quality of service.

16. The method of claim 12 wherein the step of removing the identification information from the second buffer at the second time comprises the step of removing the identification information from the second buffer at the second time, wherein the second time is based on a maximum time allowed for the step of locating the remote unit to be performed.

17. The method of claim 12 wherein the step of locating the remote unit comprises the step of locating the remote unit by sending a command to the remote unit to increase a remote unit transmit power.

18. An apparatus comprising:

a controller for determining a first base station and a second base station currently serving a remote unit;

a first buffer associated with the first base station;

a second buffer associated with the second base station;

a timer for removing identification information from the first buffer at a first time and removing identification information from the second buffer at a second time, wherein the second time does not equal the first time; and

locating equipment coupled to the first and the second buffers, the locating equipment serving to locate the remote unit only after identification information regarding the remote unit does not exist on the first and the second buffers.