Optimizing the protection of wireless local area networks with real-time, flexible, perimeter sensor feedback

• US 7,239,850 B2
• Filed: 07/22/2004
• Issued: 07/03/2007
• Est. Priority Date: 07/25/2003
• Status: Expired due to Fees

• Current Assignee: Cyrus Peikari
• Original Assignee: Cyrus Peikari
• Inventors: Peikari, Cyrus
• Primary Examiner(s): Gelin; Jean
• Assistant Examiner(s): Phan; Huy
• Application Number:
  US10/896,809
• Publication Number:
  US 20050020256A1
• Time in Patent Office: 1,076 Days
• Field of Search: 455/422.1, 455/423, 455/424, 455/421, 455/67.11, 455/69, 455/512, 455/24
• US Class Current: 455/69
• CPC Class Codes: H04W 16/14 Spectrum sharing arrangements between different networks
• CPC Class Codes: H04W 16/20 for indoor coverage or short range network deployment
• CPC Class Codes: H04W 52/30 using constraints in the total amount of available transmission power

Abstract

The invention optimizes the security of data communication on wireless local area networks (WLANs). This invention uses radio frequency (RF) radiation sensors (sensors) on the physical perimeter of a campus, or between nodes in a wireless mesh network, to detect signal bleed outside of an acceptable geographic range. In a preferred embodiment, this is achieved by (1) setting the acceptable signal strength (“bleed”) to be allowed at the perimeter, (2) sensing the RF signal strength at the perimeter sensors, (3) providing feedback from the sensors to the central radiation source controller (controller), (4) adjusting the central radiation source signal strength upwards or downwards based on acceptable ranges, (5) repeating this procedure in real time to provide constant optimization.

Claims

1. An apparatus configured to protect a wireless local area network, said wireless local area network comprising at least one access point (AP), said apparatus comprising:

a. means for setting the acceptable signal strength to be allowed at a perimeter,

b. means for sensing the radio frequency (RF) signal strength at the perimeter using RF signal sensors,

c. means for providing feedback from the sensors to a radiation source controller, and

d. means for adjusting the central radiation source signal strength upwards or downwards based on acceptable ranges,

e. assigning a higher priority to feedback from outer perimeter sensors in order to override feedback from inner perimeter sensors where there is a conflict.

2. The apparatus of claim 1, wherein said means for adjusting performs adjustments in real time.

3. A method to protect a wireless local area network (WLAN), said WLAN comprising at least one access point (AP), comprising the steps of:

a. setting the acceptable signal strength (bleed) to be allowed at a perimeter,

b. sensing the radio frequency (RF) signal strength at the perimeter using RF signal sensors,

c. providing feedback from the sensors to the central radiation source controller, and

d. adjusting the central radiation source signal strength upwards or downwards based on acceptable ranges,

e. assigning a higher priority to feedback from outer perimeter sensors in order to override feedback from inner perimeter sensors where there is a conflict.

4. The method of claim 3, further including the step of:

a. repeating steps a through d in real time to provide constant optimization.

5. The method of claim 3, wherein said multiple processes include protecting wireless local area networks.

6. The method of claim 3, wherein said multiple processes include automatically regulating the RF signal bleed from wireless networks.

7. The method of claim 3, wherein said invention uses sensors located on a campus perimeter to measure RF signal bleed.

8. The method of claim 3, further including providing feedback to a central controller from RF perimeter sensors.

9. The method of claim 3, wherein the central controller adjusts signal output based on feedback from RF perimeter sensors.

10. The method of claim 3, further including using constant feedback to prevent excessive perimeter signal bleed in real time.

11. The method of claim 3, further including using multiple perimeter sensors to provide optimized control of RF signal bleed.

12. The method of claim 3, further including using multiple, independent perimeter sensors to provide more granular control of RF signal bleed.

13. The method of claim 3, further including using directional perimeter sensors to provide more accurate control of RF signal bleed.

14. The method of claim 3, further including using amplified perimeter sensors to provide more sensitive control of RF signal bleed.

15. The method of claim 3, further including using different nodes in a wireless mesh network for automatically assigning flexible perimeters in real time.

16. A method for protecting wireless network signal bleed outside of an outer perimeter, while attempting to maintain adequate signal strength within an inner perimeter, comprising the steps of:

a. sensing signal strength on the outer perimeter,

b. providing continual feedback to ensure the signal strength does not rise above a detectable level at the outer perimeter,

c. sensing signal strength on the inner perimeter,

d. providing continual feedback to ensure the signal strength does not fall below a detectable level at the outer perimeter, i.e., balancing the signal strength within an acceptable range based on simultaneous feedback from both the outer perimeter sensors and inner perimeter sensors,

e. assigning a higher priority to feedback from inner perimeter sensors in order to override feedback from outer perimeter sensors where there is a conflict.

17. The method of claim 16, wherein the step of protecting wireless network signal bleed is accomplished using an outer perimeter.

18. The method of claim 16, wherein the step of maintaining adequate signal strength is accomplished using an inner perimeter.

19. The method of claim 16, further including:

balancing the signal strength within an acceptable range based on simultaneous feedback from both the outer perimeter sensors and inner perimeter sensors.

20. The method of claim 16, further including:

assigning both perimeters to the same point in space, including assigning both perimeters to the same device or the same node in a wireless mesh network.

21. A method for protecting wireless network signal bleed outside of an outer perimeter, while attempting to maintain adequate signal strength within an inner perimeter, accomplished using feedback from distinct sets of perimeter sensors, and further comprising the steps of:

a) sensing signal strength on the outer perimeter,

b) providing continual feedback to ensure the signal strength does not rise above a detectable level at the outer perimeter,

c) sensing signal strength on the inner perimeter,

d) providing continual feedback to ensure the signal strength does not fall below a detectable level at the outer perimeter,

e) balancing the signal strength within an acceptable range based on simultaneous feedback from both the outer perimeter sensors and inner perimeter sensors

f) assigning a higher priority to feedback from the outer perimeter sensors in order to override feedback from the inner perimeter sensors where there is a conflict.