Method and apparatus for determining path loss by active signal detection

• US 8,320,264 B2
• Filed: 05/17/2006
• Issued: 11/27/2012
• Est. Priority Date: 05/17/2005
• Status: Active Grant

• Current Assignee: Geoscope Technologies Pte. Ltd. (Transpacific IP Group Limited)
• Original Assignee: Andrew LLC (CommScope Holding Company, Inc.)
• Inventors: Arpee, John, Carlson, John Peter
• Primary Examiner(s): Shah, Chirag
• Assistant Examiner(s): Shivers, Ashley
• Application Number:
  US11/920,076
• Publication Number:
  US 20090149171A1
• Time in Patent Office: 2,386 Days
• Field of Search: None
• US Class Current: 370/252
• CPC Class Codes: H04B 17/309 Measuring or estimating channel quality parameters
• CPC Class Codes: H04B 17/318 Received signal strength
• CPC Class Codes: H04L 25/0214 of a single coefficient
• CPC Class Codes: H04W 16/18 Network planning tools
• CPC Class Codes: H04W 48/20 Selecting an access point
• CPC Class Codes: H04W 84/042 Public Land Mobile systems, e.g. cellular systems

Abstract

In one embodiment, the disclosure relates to a method for determining a path loss value of a signal transmitted from a wireless device and received by a receiver, where the wireless device and the receiver operate within a wireless communication system having at least one cell having at least one sector operating on at least one frequency channel. The method includes: (i) identifying a geographic area where the path loss value is to be determined; (ii) identifying a first cell, a first sector, and a first frequency channel associated with the geographic area wherein said wireless device is actively communicating with said receiver using said first frequency channel; (iii) receiving at said receiver the signal transmitted from said wireless device on said first frequency channel; (iv) receiving at said receiver an indication of transmission signal strength of said signal; (v) measuring at said receiver the received signal strength of said signal; and (vi) determining the path loss value of said first frequency channel as a function of the indication of transmission signal strength and the received signal strength.

Claims

1. A method for determining a path loss value of a signal transmitted from a wireless device and received by a receiver, where the wireless device and the receiver operate within a wireless communication system having at least one cell having at least one sector operating on at least one frequency channel, the method comprising the steps of:

identifying a geographic area where the path loss value is to be determined;

identifying a first cell, a first sector, and a first frequency channel associated with the geographic area wherein said wireless device is actively communicating with said receiver using said first frequency channel without disabling any other communication channel;

receiving at said receiver the signal transmitted from said wireless device on said first frequency channel;

receiving at said receiver an indication of transmission signal strength of said signal;

measuring at said receiver the received signal strength of said signal; and

determining the path loss value of said first frequency channel as a function of the indication of transmission signal strength and the received signal strength.

2. The method of claim 1, further comprising the steps of:

determining a second frequency channel which interferes with said first frequency channel; and

reassigning a second signal using said second frequency channel to a third frequency channel.

3. The method of claim 1, further comprising deteimining the path loss value for a plurality of geographic areas to compile a database.

4. The method of claim 1, wherein the receiver is a base station.

5. The method of claim 1, wherein the receiver is a wireless location sensor.

6. The method of claim 1, wherein the wireless devices is selected from the group consisting of wireless transmitter, radio frequency transmitter, mobile telephone, cellular phone, text messaging device, portable computer, laptop computer, personal digital assistant, vehicle security device, vehicle tracking device and pager.

7. The method of claim 1, wherein the wireless device is engaged in one of a duplex or a simplex communication.

8. The method of claim 1, further comprising randomly selecting said first frequency channel from among a plurality of frequency channels associated with said geographic area and engaged in active communication with said receiver.

9. The method of claim 1, further comprising selecting said first frequency channel from among a plurality of frequency channels associated with said geographic area and having at least one desired attribute.

10. The method of claim 9, wherein the attribute is selected from the group consisting of signal-to-noise ratio, signal-to-interference ratio and carrier-to-interference ratio.

11. The method of claim 1, further comprising identifying the location of the receiver and the wireless device.

12. A circuitry configured to implement the method of claim 1.

13. A method for determining a path loss value of a signal transmitted from a wireless device and received by a receiver, where the wireless device and the receiver operate within a wireless communication system, the method comprising:

identifying a first frequency channel in an active communication between the wireless device and the receiver without disabling any other communication channel;

geolocating the wireless device and the receiver;

receiving at the receiver the signal transmitted from said wireless device on said first frequency channel;

receiving at said receiver an indication of transmission signal strength of said signal;

measuring at said receiver the received signal strength of said signal; and

determining the path loss value of said first frequency channel as a function of the indication of transmission signal strength and the received signal strength.

14. The method of claim 13, further comprising the steps of:

determining a second frequency channel which interferes with said first frequency channel; and

reassigning a second signal using said second frequency channel to a third frequency channel.

15. The method of claim 13, further comprising determining the path loss value for a plurality of geographic areas to compile a database.

16. The method of claim 13, wherein the first frequency channel in active communication is engaged in a duplex communication.

17. The method of claim 13, wherein the first frequency channel in active communication is engaged in a simplex communication.

18. The method of claim 13, further comprising selecting said first frequency channel from among a plurality of frequency channels having at least one desired attribute.

19. The method of claim 18, wherein the attribute is selected from the group consisting of signal-to-noise ratio, signal-to-interference ratio, inter-symbol interference and carrier-to-interference ratio.

20. The method of claim 13, wherein the receiver is a plurality of receivers each disposed at a different location from each other and a different from the location of the wireless device.

21. The method of claim 13, wherein the receiver is a base station or a wireless location sensor (“

WLS”

) or a combination of the base station and a WLS.

22. A circuitry configured to implement the method of claim 13.

23. A system for determining a path loss value of a signal transmitted from a wireless device and received by a receiver, where the wireless device and the receiver operate within a wireless communication system having at least one cell having at least one sector operating on at least one frequency channel, the system comprising:

a circuitry including a microprocessor and a memory for compiling a database for receiving the path loss values, the circuitry configured with instructions to;

identify a geographic area where the path loss value is to be determined;

identify a first cell, a first sector, and a first frequency channel associated with the geographic area wherein said wireless device is actively communicating with said receiver using said first frequency channel without disabling any other communication channel;

receive at said receiver the signal transmitted from said wireless device on said first frequency channel;

receive at said receiver an indication of transmission signal strength of said signal;

measure at said receiver the received signal strength of said signal; and

determine the path loss value of said first frequency channel as a function of the indication of transmission signal strength and the received signal strength.

24. The system of claim 23, wherein the circuitry is further programmed with instructions to:

determine a second frequency channel which interferes with said first frequency channel; and

reassign a second signal using said second frequency channel to a third frequency channel.

25. The system of claim 23, wherein the circuitry is further programmed with instructions to determine the path loss value for a plurality of geographic areas to compile a database.

26. The system of claim 23, wherein the receiver is selected from the group consisting of wireless transmitter, radio frequency transmitter, mobile telephone, cellular phone, text messaging device, portable computer, laptop computer, personal digital assistant, vehicle security device, vehicle tracking device, pager, base station and wireless location sensor.

27. The system of claim 23, wherein the wireless devices is selected from the group consisting of wireless transmitter, radio frequency transmitter, mobile telephone, cellular phone, text messaging device, portable computer, laptop computer, personal digital assistant, vehicle security device, vehicle tracking device and pager.

28. The system of claim 23, wherein the wireless device is engaged in one of a simplex or a duplex communication area.

29. The system of claim 23, wherein the circuitry is further programmed with instructions to randomly select said first frequency channel from among a plurality of frequency channels associated with said geographic.

30. The system of claim 23, wherein the circuitry is further programmed with instructions to select said first frequency channel from among a plurality of frequency channels associated with said geographic area and having at least one desired attribute.

31. An apparatus for determining a path loss value of a signal transmitted from a wireless device and received by a receiver, comprising:

means for identifying an active communication channel supporting at least one desirable attribute;

means for identifying the wireless device and the receiver tasked to communicate on said active communication channel without disabling any other communication channel;

means for locating said wireless device and said receiver;

means for identifying a transmitted signal strength for signaling on said active communication channel;

means for identifying a received signal strength for signaling on said active communication channel; and

means for calculating the path loss value as a function of the transmitted signal strength and the received signal strength.

32. The apparatus of claim 31, wherein the desirable attribute comprises of at least one of a signal-to-noise ratio, a signal-to-interference ratio, an inter-symbol interference and a carrier-to-interference ratio below a threshold value.

33. The apparatus of claim 31, wherein the means for identifying an active communication channel comprises an antenna, a radio receiver and a microprocessor.

34. The apparatus of claim 31, wherein the means for identifying the wireless device and the receiver comprises a microprocessor programmed with instructions to search a database stored in a digital memory.

35. The apparatus of claim 31, wherein the means for locating said wireless device and said receiver comprises a wireless location system.

36. The apparatus of claim 31, wherein the means for locating said wireless device and said receiver comprises a geo-positioning system (“

GPS”

).

37. The apparatus of claim 31, wherein the transmitted signal strength defines the signal strength at the wireless device.

38. The apparatus of claim 31, wherein the means for identifying a transmitted signal strength for signaling on said active communication channel comprises an antenna and a signal detection circuit.

39. The apparatus of claim 31, wherein means for identifying the wireless device and the receiver further comprises means for tasking the wireless device and the receiver to signal on said active communication channel.

40. The apparatus of claim 31, further comprising means for detecting a second communication channel interfering with the active communication channel.

41. The apparatus of claim 40, further comprising means for reassigning the second communication channel to a third communication channel.