Access Point And Channel Selection In A Wireless Network For Reduced RF Interference

• US 20140241182A1
• Filed: 02/27/2013
• Published: 08/28/2014
• Est. Priority Date: 02/27/2013
• Status: Abandoned Application

• Current Assignee: Malikie Innovations Limited (Key Patent Innovations Limited)
• Original Assignee: Blackberry Limited
• Inventors: Smadi, Mohammed Nawaf
• Application Number:
  US13/778,606
• Publication Number:
  US 20140241182A1
• Time in Patent Office: Days
• US Class Current: 370/252
• CPC Class Codes: H04W 36/00835 Determination of neighbour cell lists
• CPC Class Codes: H04W 36/14 Reselecting a network or an air interface
• CPC Class Codes: H04W 36/20 for optimising the interference level

Abstract

For each access point in a first network of a first type, a mobile device identifies a frame error rate of communications. The frame error rate is measured while simultaneously communicating with a second network of a second type. The mobile device stores the frame error rate in association with an access point identifier of the access point. Upon encountering, the first network again, the mobile device prioritizes the selection of an access point based on a ranking of the access points according to their associated frame error rates from lowest to highest. Further, the mobile device may use adjusted hysteresis parameters for making a handover decision in order to reduce a “ping-pong” selection between access points. Additionally or alternatively, the mobile device may select or suggest a channel of the access point based on a signal strength of signals from the second network.

Claims

1. A method in a mobile communication device for use in reducing interference in communication with a first wireless network of a first type due to simultaneous communication with a second wireless network of a second type, the method comprising:

for each one of a plurality of access points in the first wireless network;

identifying a frame error rate for communication via the access point of the first wireless network, the frame error rate being measured during communication with the second wireless network of the second type;

storing the frame error rate in association with an access point identifier of the access point; and

upon encountering the first wireless network again, prioritizing selection of an access point of the first wireless network for communication based on a ranking of the access points according to their associated frame error rates from lowest to highest.

2. The method of claim 1, further comprising:

selecting an access point for communication based on the prioritized selection; and

adjusting hysteresis parameters used for making a handover decision for communication with the selected access point.

3. The method of claim 2 wherein the adjusted hysteresis parameters are lowered to avoid occurrence of a ping-pong selection between access points in the first wireless network by the mobile device.

4. The method of claim 1, wherein prioritizing selection of an access point further comprises prioritizing selection of an access point associated with the lowest frame error rate over all other access points in the first wireless network.

5. The method of claim 1, wherein prioritizing selection of an access point further comprises prioritizing selection of an access point associated with the lowest frame error rate over all other access points in the first wireless network if a received signal strength of the selected access point is greater than a signal strength threshold.

6. The method of claim 1, wherein communication in the first wireless network is within a first radio frequency (RF) band and communication in the second wireless network is within a second RF band adjacent the first RF band, and the first RF band may be characterized to have a near side portion and a far side portion, the near side portion being closer in frequency to the second RF band than the far side portion, the method further comprising:

identifying a signal strength of a received signal from the second wireless network of the second type;

when the signal strength of the received signal less than a low threshold, providing a data indication for selection of an RF channel that is located in the far side portion of the first RF band; and

sending the indication to the access point or first wireless network for selection of an RF channel of the access point for communications with the mobile communication device.

7. The method of claim 1, wherein communication in the first wireless network is within a first radio frequency (RF) band and communication in the second wireless network is within a second RF band adjacent the first RF band, and first RF band may be characterized by a near side portion and a far side portion, the near side portion being closer in frequency to the second RF band than the far side portion, the method further comprising:

identifying a signal strength of a received signal from the second wireless network of the second type;

when the signal strength of the received signal is greater than a high threshold, providing a data indication for selection of an RF channel that is located in the near side portion of the first RF band; and

sending the data indication to the access point or first wireless network for selection of an RF channel of the access point for communications with the mobile communication device.

8. The method of claim 1, wherein the access point identifier comprises a base service set identifier (BSSID).

9. The method of claim 1, wherein the first type of first wireless network comprises a wireless focal area network (WLAN).

10. The method of claim 1, wherein the second type of second wireless network comprises a Long Term Evolution (LTE) network.

11. A mobile communication device, comprising:

one or more processors;

a memory coupled to the one or more processors;

a first radio frequency (RF) transceiver configured to communicate in a first RF band with a first wireless network of a first type;

a second RF transceiver configured to communicate in a second RF band with a second wireless network of a second type;

the one or more processors being configured to;

for each one of a plurality of access points in the first wireless network;

identify a frame error rate for communications via the access point of the first wireless network, the frame error rate being measured during communications with the second wireless network of the second type;

store in the memory the frame error rate in association with an access point identifier of the access point; and

upon encountering the first wireless network again, prioritize selection of an access point of the first wireless network for communication based on a ranking of the access points according to their associated frame error rates from lowest to highest.

12. The mobile device of claim 11, wherein the one or more processors are further configured to:

select an access point for communications based on the prioritized selection; and

adjust hysteresis parameters used for making a handover decision for communications with the selected access point.

13. The mobile device of claim 11, wherein the one or more processors are further configured to prioritize the selection of an access point by prioritizing the selection of an access point associated with the lowest frame error rate over all other access points in the first wireless network.

14. The mobile device of claim 11, wherein the first RF band may be characterized as having a near side portion and a far side portion, the near side portion being closer in frequency to the second RF band than the far side portion, and wherein the one or more processors are further configured to:

identify a signal strength of a received signal from the second wireless network of the second type;

when the signal strength of the received signal is less than a low threshold, provide a data indication for selection of an RF channel that is located in the far side portion of the first RF band; and

send the data indication to the access point or first wireless network for selection of an RF channel of the access point for communications with the mobile communication device.

15. The mobile device of claim 11, wherein the first RF band may be characterized as having a near side portion and a far side portion, the near side portion being closer in frequency to the second RF band than the far side portion, and wherein the one or more processors are further configured to:

identify a signal strength of a received signal from the second wireless network of the second type;

when the signal strength of the received signal is greater than a high threshold, provide a data indication for selection of an RF channel that is located in the near side portion of the first RF band; and

send the data indication to the access point or first wireless network for selection of an RF channel of the access point for communications with the mobile communication device.

16. The mobile device of claim 11, wherein each access point identifier comprises a base service set identifier (BSSID).

17. The mobile device of claim 11, wherein the first type of first wireless network comprises a wireless local area network (WLAN).

18. The mobile device of claim 11, wherein the second type of second wireless network comprises a Long Term Evolution (LTE) network.

19. A method of a mobile communication device for reducing interference of communications in a first wireless network of a first type for simultaneous communications with a second wireless network of a second type, the communications in the first wireless network being within a first radio frequency (RF) band and the communications in the second wireless network being in a second RF band, the first RF band being characterized as having a near side portion and a far side portion, the near side portion being closer in frequency to the second RF band than the far side portion, the method comprising:

identifying a signal strength of a received signal from the second wireless network of the second type;

when the signal strength of the received signal is less than a low threshold, providing a data indication for selection of an RF channel of the access point that is located in the far side portion of the first RF band; and

sending the data indication to the access point or first wireless network for selection of an RF channel of the access point for communications with the mobile device.

20. The method of claim 19, further comprising:

when the signal strength of the received signal is greater than a high threshold, providing a data indication for selection of an RF channel of the access point that is located in the near side portion of the first RF band; and

sending the data indication to the access point or first wireless network for selection of an RF channel of the access point for communications with the mobile device.

21. The method of claim 19, wherein the data indication comprises a channel number which identifies a channel in the far side portion of the first RF band.

22. The method of claim 19, wherein the data indication indicates at least one of the far side portion or the rear side portion of the first RF band.

23. The method of claim 19, wherein the first type of first wireless network comprises a wireless local area network (WLAN).

24. The method of claim 19, wherein the second type of second wireless network comprises a Long Term Evolution (LTE) network.