Minimization of In-Band Noise in a WLAN Network

• US 20080019334A1
• Filed: 07/24/2006
• Published: 01/24/2008
• Est. Priority Date: 07/24/2006
• Status: Abandoned Application

• Current Assignee: Lenovo Singapore Pte Limited (Lenovo Group Ltd.)
• Original Assignee: Lenovo Singapore Pte Limited (Lenovo Group Ltd.)
• Inventors: Octaviano, Raymond Gary, Locker, Howard Jeffrey, Jakes, Philip John, Cromer, Daryl, Adams, Stewart Lane
• Application Number:
  US11/459,385
• Publication Number:
  US 20080019334A1
• Time in Patent Office: Days
• US Class Current: 370/338
• CPC Class Codes: H04W 36/20 for optimising the interference level

Abstract

A method, apparatus and computer-usable medium for minimizing in-band noise in a WLAN network is presented. The method includes the steps of detecting, at a first wireless device that communicates with a Wireless Local Area Network (WLAN) via a first access point, a signal interference that is caused by a second wireless device that communicates with the WLAN via a second access point, wherein the first and second access points communicate with their respective first and second wireless devices via a same channel; and minimizing the signal interference by sending an instruction to the second wireless device to switch to a third access point, wherein the third access point uses a different channel than the channel that is used by the first and second access points.

Claims

1. A method comprising:

detecting, at a first wireless device that communicates with a Wireless Local Area Network (WLAN) via a first access point, a signal interference that is caused by a second wireless device that communicates with the WLAN via a second access point, wherein the first and second access points communicate with their respective first and second wireless devices via a same channel; and

minimizing the signal interference by sending an instruction to the second wireless device to switch to a third access point, wherein the third access point uses a different channel than a channel that is used by the first and second access points.

2. The method of claim 1, wherein the signal interference is an in-band radio frequency interference.

3. The method of claim 2, further comprising:

determining if the in-band radio frequency interference is from an IEEE 802.11x compliant transmitting client device or is from another noise source; and

performing the minimizing step only if the in-band radio frequency interference is from an IEEE 802.11x compliant transmitting client device.

4. The method of claim 1, wherein the instruction, which was sent instructing the second wireless device to switch to the third access point, is sent from the first access point to the second wireless device via the second access point.

5. The method of claim 4, wherein the first access point identifies the second access point by reading a header of a data packet sent by the second wireless device.

6. The method of claim 1, wherein the first and second wireless devices are in a peer-to-peer configuration, and wherein the instruction, which was sent instructing the second wireless device to switch to the third access point, is sent directly from the first wireless device to the second wireless device.

7. The method of claim 1, wherein the first wireless device is a laptop computer.

8. The method of claim 1, wherein the second wireless device switches to the third access point only if the second wireless device detects a lower signal strength from the third access point than from the first or second access points.

9. The method of claim 1, further comprising:

in response to determining that a third access point is not available to the second wireless device, causing the second wireless device to listen for data transmission activity between the first wireless device and the first access point; and

permitting transmission activity to and from the second wireless device only during periods in which the second wireless device detects is a lack of activity between the first wireless device and the first access point.

10. A system comprising:

a first access point to a Wireless Local Area Network (WLAN);

a first wireless device, wherein the first wireless device is wirelessly coupled to the first access point, and wherein the first wireless device comprises logic for detecting a signal interference that is caused by a second wireless device that communicates with the WLAN via a second access point, and wherein the first and second access points communicate with their respective first and second wireless devices via a same channel, and wherein the first access point comprises a transmitter for sending an instruction to the second wireless device to switch to a third access point, wherein the third access point uses a different channel than a channel that is used by the first and second access points.

11. The system of claim 10, wherein the signal interference is an in-band radio frequency interference.

12. The system of claim 11, further comprising:

logic in the first wireless device for determining if the in-band radio frequency interference is from an IEEE 802.11x compliant transmitting client device or is from another noise source, wherein the instruction for the second wireless device is sent only if the in-band radio frequency interference is from an IEEE 802.11x compliant transmitting client device.

13. The system of claim 10, wherein the first wireless device is a laptop computer.

14. A computer-usable medium embodying computer program code, the computer program code comprising computer executable instructions configured for:

detecting, at a first wireless device that communicates with a Wireless Local Area Network (WLAN) via a first access point, a signal interference that is caused by a second wireless device that communicates with the WLAN via a second access point, wherein the first and second access points communicate with their respective first and second wireless devices via a same channel; and

minimizing the signal interference by sending an instruction to the second wireless device to switch to a third access point, wherein the third access point uses a different channel than a channel that is used by the first and second access points.

15. The computer-usable medium of claim 14, wherein the signal interference is an in-band radio frequency interference.

17. The computer-usable medium of claim 14, wherein the instruction, which was sent instructing the second wireless device to switch to the third access point, is sent from the first access point to the second wireless device via the second access point.

18. The computer-usable medium of claim 17, wherein the first access point identifies the second access point by reading a header of a data packet sent by the second wireless device.

19. The computer-usable medium of claim 14, wherein the second wireless device switches to the third access point only if the second wireless device detects a lower signal strength from the third access point than from the second access point.

20. The computer-usable medium of claim 14, wherein the computer executable instructions are further configured for:

in response to determining that a third access point is not available to the second wireless device, causing the second wireless device to listen for data transmission activity between the first wireless device and the first access point; and

permitting transmission activity to and from the second wireless device only during periods in which the second wireless device detects is a lack of activity between the first wireless device and the first access point.

16. The computer-usable medium of claim 16, wherein the computer executable instructions are further configured for:

determining if the in-band radio frequency interference is from an IEEE 802.11x compliant transmitting client device or is from another noise source; and

performing the minimizing step only if the in-band radio frequency interference is from an IEEE 802.11x compliant transmitting client device.