Systems and methods for dynamically adjusting roaming parameters

• US 9,716,995 B2
• Filed: 11/22/2013
• Issued: 07/25/2017
• Est. Priority Date: 11/22/2013
• Status: Active Grant

• Current Assignee: Qualcomm, Inc.
• Original Assignee: Qualcomm, Inc.
• Inventors: Davuluru, Dinesh, Ye, Linzhao, He, Jianqiang, Mudigonda, Ravishanker
• Primary Examiner(s): Batista, Marcos
• Application Number:
  US14/088,263
• Publication Number:
  US 20150148031A1
• Time in Patent Office: 1,341 Days
• Field of Search: 4554321, 370338
• CPC Class Codes: H04W 36/08 Reselecting an access point
• CPC Class Codes: H04W 48/16 Discovering, processing access restriction or access information
• CPC Class Codes: H04W 48/20 Selecting an access point
• CPC Class Codes: H04W 8/02 Processing of mobility data, e.g. registration information at HLR [Home Location Register] or VLR [Visitor Location Register]; Transfer of mobility data, e.g. between HLR, VLR or external networks
• CPC Class Codes: H04W 84/12 WLAN [Wireless Local Area Networks]

Abstract

This disclosure includes systems and methods for adjusting one or more roaming parameters using information regarding WLAN activity and/or a connection characteristic indicative of the reliability of the connection.

Claims

1. A method for identifying available access points (APs) in a wireless environment with a wireless communications device, comprising:

monitoring data exchanged by a wireless local area network (WLAN) transceiver of the device;

determining a connection characteristic of a communications link between an AP and the wireless communications device;

dynamically adjusting a roaming threshold based, at least in part, on changes in the monitored data and the determined connection characteristic, wherein the roaming threshold corresponds to a level of performance of the communications link at which roaming scans are suspended; and

determining whether to perform a roaming scan, to discover other APs in the wireless environment while maintaining the communications link with the AP, based on a comparison between at least one characteristic of the communications link and the dynamically adjusted roaming threshold.

2. The method of claim 1, further comprising adjusting a switching threshold or a roaming interval based, at least in part, on the monitored data or the determined connection characteristic.

3. The method of claim 1, wherein monitoring data exchanged by the WLAN transceiver comprises identifying an access category for the monitored data and dynamically adjusting the roaming threshold comprises adjusting the roaming threshold based, at least in part, on the access category.

4. The method of claim 3, wherein the access category comprises at least one of voice traffic, video traffic, best effort traffic or background traffic.

5. The method of claim 3, further comprising adjusting a roaming interval, based, at least in part, on the monitored data or the determined connection characteristic.

6. The method of claim 1, further comprising adjusting a roaming parameter to an idle value when no traffic is monitored for a period of time.

7. The method of claim 1, further comprising collecting an operational status of a radio access technology (RAT) transceiver collocated on the device, wherein dynamically adjusting the roaming threshold is further based, at least in part, on the operational status.

8. The method of claim 7, wherein collecting the operational status comprises obtaining the operational status from an interface between the WLAN transceiver and the RAT transceiver that does not require involvement from a host processor of the device.

9. The method of claim 1, further comprising obtaining WLAN usage from an application running on a host processor of the device, wherein dynamically adjusting the roaming threshold is further based, at least in part, on the WLAN usage.

10. The method of claim 1, further comprising:

determining that the at least one characteristic of the communications link is above the roaming threshold; and

suspending roaming scans in response to the determination that the at least one characteristic of the communications link is above the roaming threshold.

11. The method of claim 1, further comprising:

determining that the at least one characteristic of the communications link is below the roaming threshold; and

performing one or more roaming scans in response to the determination that the at least one characteristic of the communications link is below the roaming threshold.

12. A wireless communications device for identifying available access points (APs) in a wireless environment, comprising a wireless local area network (WLAN) transceiver and a roaming controller, wherein the roaming controller is configured to:

monitor data exchanged by the WLAN transceiver;

determine a connection characteristic of a communications link between an AP and the wireless communications device;

dynamically adjust a roaming threshold based, at least in part, on changes in the monitored data and the determined connection characteristic, wherein the roaming threshold corresponds to a level of performance of the communications link at which roaming scans are suspended; and

determine whether to perform a roaming scan, to discover other APs in the wireless environment while maintaining the communications link with the AP, based on a comparison between at least one characteristic of the communications link and the dynamically adjusted roaming threshold.

13. The wireless communications device of claim 12, wherein the roaming controller is further configured to adjust a switching threshold or a roaming interval based, at least in part, on the monitored data or the determined connection characteristic.

14. The wireless communications device of claim 12, wherein the roaming controller is configured to monitor data exchanged by the WLAN transceiver by identifying an access category for the monitored data and to dynamically adjust the roaming threshold based, at least in part, on the access category.

15. The wireless communications device of claim 14, wherein the access category comprises at least one of voice traffic, video traffic, best effort traffic or background traffic.

16. The wireless communications device of claim 14, wherein the roaming controller is further configured to adjust a roaming interval based, at least in part, on the monitored data or the determined connection characteristic.

17. The wireless communications device of claim 12, wherein the roaming controller adjusts a roaming parameter to an idle value when no traffic is monitored for a given period.

18. The wireless communications device of claim 12, further comprising a radio access technology (RAT) transceiver collocated on the device, wherein the roaming controller is configured to collect an operational status of the RAT transceiver and to dynamically adjust the roaming threshold based, at least in part, on the operational status.

19. The wireless communications device of claim 18, further comprising a host processor and an interface between the WLAN transceiver and the RAT transceiver, wherein the interface does not require involvement from a host processor of the device and wherein the roaming controller collects the operational status over the interface.

20. The wireless communications device of claim 12, further comprising a host processor, wherein the roaming controller is configured to obtain WLAN usage from an application running on the host processor and to dynamically adjust the roaming threshold based, at least in part, on the WLAN usage.

21. The wireless communications device of claim 12, wherein the roaming controller is further configured to:

determine that the at least one characteristic of the communications link is above the roaming threshold; and

suspend roaming scans in response to the determination that the at least one characteristic of the communications link is above the roaming threshold.

22. The wireless communications device of claim 12, wherein the roaming controller is further configured to:

determine that the at least one characteristic of the communications link is below the roaming threshold; and

perform one or more roaming scans in response to the determination that the at least one characteristic of the communications link is below the roaming threshold.

23. A non-transitory processor-readable storage medium for identifying available access points (APs) in a wireless environment with a wireless communications device, the processor-readable storage medium having instructions thereon, when executed by a processor to cause the wireless communications device to:

monitor data exchanged by a wireless local area network (WLAN) transceiver of the device;

determine a connection characteristic regarding a communications link between an AP and the wireless communications device;

dynamically adjust a roaming threshold based, at least in part, on changes in the monitored data and the determined connection characteristic, wherein the roaming threshold corresponds to a level of performance of the communications link at which roaming scans are suspended; and

determine whether to perform a roaming scan, to discover other APs in the wireless environment while maintaining the communications link with the AP, based on a comparison between at least one characteristic of the communications link and the dynamically adjusted roaming threshold.

24. The storage medium of claim 23, wherein the instructions further cause the wireless communications device to adjust a switching threshold or a roaming interval based, at least in part, on the monitored data or the determined connection characteristic.

25. The storage medium of claim 23, wherein the instructions to monitor data exchanged by the WLAN transceiver cause the wireless communications device to identify an access category for the monitored data and to dynamically adjust the roaming threshold based, at least in part, on the access category.

26. The storage medium of claim 25, wherein the access category comprises at least one of voice traffic, video traffic, best effort traffic or background traffic.

27. The storage medium of claim 25, wherein the instructions further cause the wireless communications device to adjust a roaming interval based, at least in part, on the monitored data or the determined connection characteristic.

28. The storage medium of claim 23, wherein the instructions to dynamically adjust the roaming threshold cause the wireless communications device to adjust the roaming threshold to an idle value when no traffic is monitored for a given period.

29. The storage medium of claim 23, wherein the instructions further cause the wireless communications device to collect an operational status of a radio access technology (RAT) transceiver collocated on the device, and wherein the instructions for dynamically adjusting the roaming threshold further cause the wireless communications device to adjust the roaming threshold based, at least in part, on the operational status.

30. The storage medium of claim 29, wherein the operational status is obtained from an interface between the WLAN transceiver and the RAT transceiver that does not require involvement from a host processor of the device.

31. The storage medium of claim 23, wherein the instructions further cause the wireless communications device to obtain WLAN usage from an application running on a host processor of the device, and wherein the instructions for dynamically adjusting the roaming threshold cause the wireless communications device to adjust the roaming threshold based, at least in part, on the WLAN usage.

32. A method for identifying available access points (APs) in a wireless network, wherein the wireless network includes a wireless device that exchanges data with a first AP using a wireless local area network (WLAN) transceiver, comprising:

monitoring the exchanged data;

dynamically adjusting a roaming interval and a roaming threshold of the device based at least in part on changes in the monitored data, wherein the roaming threshold corresponds to a level of performance of the communications link at which roaming scans are suspended; and

determining whether to perform a roaming scan, to discover other APs in the wireless environment while maintaining a communications link with the first AP, based at least in part on the adjustments to the roaming interval and the roaming threshold.

33. The method of claim 32, wherein monitoring the exchanged data comprises identifying an access category for the monitored data, and wherein at least one of the roaming interval or the roaming threshold is adjusted based, at least in part, on the access category.

34. The method of claim 33, wherein the access category comprises at least one of voice traffic, video traffic, best effort traffic or background traffic.