Wireless frequency re-use determination systems

• US 7,149,479 B2
• Filed: 09/08/2004
• Issued: 12/12/2006
• Est. Priority Date: 04/24/2001
• Status: Expired due to Fees

• Current Assignee: Bellsouth Intellectual Property Corporation (AT&T, Inc.)
• Original Assignee: Bellsouth Intellectual Property Corporation (AT&T, Inc.)
• Inventors: Johnson, Derek, Jabbary, Ali, Austin, Mark, Latiolais, Dock
• Primary Examiner(s): NGUYEN, THUAN T
• Application Number:
  US10/936,155
• Publication Number:
  US 20050026567A1
• Time in Patent Office: 825 Days
• Field of Search: 455/67.1, 455/436, 455/437, 455/438, 455/439, 455/442, 455/445, 455/446, 455/447, 455/448, 455/63.3, 455/67.11, 455/67.13, 455/67.14, 455/550.1
• US Class Current: 455/67.11
• CPC Class Codes: H04W 16/18 Network planning tools
• CPC Class Codes: H04W 24/02 Arrangements for optimising operational condition

Abstract

A method of measuring frequency interference between adjacent cell sites in a wireless telecommunications system. The method includes selecting a frequency in a cell site to be used as a beacon frequency. The method also includes activating the beacon frequency in the cell site and recording, at a telecommunications switch, a signal strength of the beacon frequency as measured by a first wireless device operating in the cell site and a signal strength of the beacon frequency as measured by a second wireless device operating in another cell site. The method further includes determining the frequency interference between the cell site and the other cell site based on the signal strengths.

Claims

1. A telecommunications system, comprising:

a telecommunications switch for;

selecting a frequency in a cell site to be used as a beacon frequency which is transmitted from the cell site, wherein selecting a frequency includes selecting a frequency carrying the least amount of traffic across a plurality of cell sites and protecting the frequency from carrying the traffic; and

activating the beacon frequency in the cell site; and

a computer in communication with the switch for determining a frequency interference between the cell site and another cell site based on signal strength data resident on the switch, wherein the signal strength data include a signal strength of the beacon frequency as measured by a first wireless device operating in the cell site and a signal strength of the beacon frequency as measured by a second wireless device in the other cell site.

2. The system of claim 1, wherein the switch is further for removing the beacon frequency from availability for use in the system by wireless device users.

3. The system of claim 1, wherein the computer is further for generating a carrier/interference matrix.

4. The system of claim 1, wherein the switch is further for de-activating the beacon frequency.

5. The system of claim 1, wherein the switch is further for selecting a trigger frequency to simulate a hand-off situation for the wireless device.

6. The system of claim 1, wherein the cell site and the other cell site are adjacent.

7. The system of claim 1, wherein the telecommunications switch is further for adding the beacon frequency to a list of frequencies.

8. The system of claim 7, wherein adding the beacon frequency to a list of frequencies includes adding the beacon frequency to a mobile assisted handoff (MAHO) list in a telecommunications switch.

9. The system of claim 1, wherein the telecommunications switch is a mobile switching center.

10. The system of claim 1, wherein the computer is in communication with the switch via one of a local area network, a wide area network, and the Internet.

11. The system of claim 1, wherein the cell site and the other cell site each have a base station.

12. An apparatus, comprising:

means for selecting a frequency in a cell site to be used as a beacon frequency which is transmitted from the cell site, wherein selecting a frequency includes selecting a frequency carrying the least amount of traffic across a plurality of cell sites and protecting the frequency from carrying the traffic;

means for activating the beacon frequency in the cell site;

means for recording, at a telecommunications switch, a signal strength of the beacon frequency as measured by a first wireless device operating in the cell site and a signal strength of the bacon frequency as measured by a second wireless device operating in another cell site; and

means for determining the frequency interference between the cell site and the other cell site based on the signal strengths.

13. The apparatus of claim 12, further comprising means for removing the beacon frequency from availability for use in a telecommunications system by wireless device users.

14. The apparatus of claim 12, further comprising means for generating a carrier/interference matrix.

15. The apparatus of claim 12, further comprising means for selecting a trigger frequency to simulate a hand-off situation for the second wireless device.

16. A computer-readable medium having stored thereon instructions which, when executed by a processor, cause the processor to determine a frequency interference between a cell site and another cell site based on a plurality of signal strengths, wherein the signal strengths are measured by:

selecting a frequency in a cell site to be used as a beacon frequency which is transmitted from the cell site, wherein selecting a frequency includes selecting a frequency carrying the least amount of traffic across a plurality of cell sites and protecting the frequency from carrying the traffic;

activating the beacon frequency in the cell site; and

recording, at a telecommunications switch, a signal strength of the beacon frequency as measured by a first wireless device operating in the cell site and a signal strength of the bacon frequency as measured by a second wireless device operating in the other cell site.

17. The computer-readable medium of claim 16 having stored thereon additional instructions which, when executed by a processor, cause the processor to generate a carrier/interference matrix.

18. The computer-readable medium of claim 16 having stored thereon additional instructions which, when executed by a processor, cause the processor to remove the beacon frequency from availability for use in a telecommunications system by wireless device users.