Off channel scanning on workgroup bridge (WGB) devices for fast roaming

Patent metadata

Field	Value
Publication number	US-10412643-B1
Application number	US-201816172747-A
Country	US
Kind code	B1
Filing date	Oct 27, 2018
Priority date	Oct 27, 2018
Publication date	Sep 10, 2019
Grant date	Sep 10, 2019

Abstract

Off channel scanning on workgroup bridge (WGB) devices for fast roaming may be provided. First, it may be determined, by a first WGB, that a second WGB is not off-channel. The second WGB may be peered with the first WGB. Next, the first WGB may perform channel scanning in response to determining that the second WGB is not off-channel. The first WGB may then prioritize a first WGB channel list based on results from the channel scanning performed by the first WGB. Next, the first WGB may roam while the second WGB in not off-channel, from a first access point to a second access point on a channel with the highest priority in the first WGB channel list.

First claim

What is claimed is:

1. A method comprising:
determining, by a first workgroup bridge (WGB), that a second WGB is not off-channel, wherein the second WGB is peered with the first WGB;
performing channel scanning, by the first WGB, in response to determining that the second WGB is not off-channel;
prioritizing, by the first WGB, a first WGB channel list based on results from the channel scanning performed by the first WGB; and
roaming, by the first WGB while the second WGB in not off-channel, from a first access point to a second access point on a channel with the highest priority in the first WGB channel list.

2. The method of claim 1 , wherein determining, by the first WGB, that the second WGB is not off-channel comprises determining, by the first WGB, that the second WGB is not performing channel scanning.

3. The method of claim 1 , wherein determining that the second WGB is not off-channel wherein the second WGB is peered with the first WGB comprise determining that the second WGB is not off-channel wherein the second WGB is peered with the first WGB by a wired connection and are kept alive with each other by a heartbeat message.

4. The method of claim 1 , wherein roaming by the first WGB from the first access point to the second access point comprises, prior to roaming by the first WGB from the first access point to the second access point, the second WGB is also connected to the first access point.

5. The method of claim 1 , further comprising providing, by the first WGB, the first WGB channel list to the second WGB.

6. The method of claim 1 , further comprising:
receiving, by the second WGB, the first WGB channel list from the first WGB;
determining, by a second WGB, that a first WGB is not off-channel;
performing channel scanning, by the second WGB, in response to determining that the first WGB is not off channel;
prioritizing, by the second WGB, the first WGB channel list based on results from the channel scanning performed by the second WGB; and
roaming, by the second WGB while the first WGB in not off-channel, from the first access point to the second access point on the channel with this highest priority in the first WGB channel list.

7. The method of claim 1 , further comprising allowing a client devices to connect, through a traffic distributor, to both the first WGB and the second WGB.

8. A system comprising:
a memory storage; and
a processing unit coupled to the memory storage and disposed in a first workgroup bridge (WGB), wherein the processing unit is operative to:
determine that a second WGB is not off-channel, wherein the second WGB is peered with the first WGB;
perform channel scanning in response to determining that the second WGB is not off-channel;
prioritize a first WGB channel list based on results from the channel scanning performed; and
roam, while the second WGB in not off-channel, from a first access point to a second access point on a channel with the highest priority in the first WGB channel list.

9. The system of claim 8 , wherein the processing unit being operative to determine that the second WGB is not off-channel comprises the processing unit being operative to determine that the second WGB is not performing channel scanning.

10. The system of claim 8 , wherein the second WGB is peered with the first WGB by a wired connection and are kept alive with each other by a heartbeat message.

11. The system of claim 8 , wherein the second WGB is also connected to the first access point.

12. The system of claim 8 , wherein the processing unit is further operative to provide the first WGB channel list to the second WGB.

13. The system of claim 8 , wherein a client devices is connected, through a traffic distributor, to both the first WGB and the second WGB.

14. A non-transitory computer-readable medium that stores a set of instructions which when executed perform a method comprising: determining, by a first workgroup bridge (WGB), that a second WGB is not off-channel, wherein the second WGB is peered with the first WGB; performing channel scanning, by the first WGB, in response to determining that the second WGB is not off-channel; prioritizing, by the first WGB, a first WGB channel list based on results from the channel scanning performed by the first WGB; and roaming, by the first WGB while the second WGB in not off-channel, from a first access point to a second access point on a channel with the highest priority in the first WGB channel list.

15. The non-transitory computer-readable medium of claim 14 , wherein determining, by the first WGB, that the second WGB is not off-channel comprises determining, by the first WGB, that the second WGB is not performing channel scanning.

16. The non-transitory computer-readable medium of claim 14 , wherein determining that the second WGB is not off-channel wherein the second WGB is peered with the first WGB comprise determining that the second WGB is not off-channel wherein the second WGB is peered with the first WGB by a wired connection and are kept alive with each other by a heartbeat message.

17. The non-transitory computer-readable medium of claim 14 , wherein roaming by the first WGB from the first access point to the second access point comprises, prior to roaming by the first WGB from the first access point to the second access point, the second WGB is also connected to the first access point.

18. The non-transitory computer-readable medium of claim 14 , further comprising providing, by the first WGB, the first WGB channel list to the second WGB.

19. The non-transitory computer-readable medium of claim 14 , further comprising: receiving, by the second WGB, the first WGB channel list from the first WGB; determining, by a second WGB, that a first WGB is not off-channel; performing channel scanning, by the second WGB, in response to determining that the first WGB is not off channel; prioritizing, by the second WGB, the first WGB channel list based on results from the channel scanning performed by the second WGB; and roaming, by the second WGB while the first WGB in not off-channel, from the first access point to the second access point on the channel with this highest priority in the first WGB channel list.

20. The non-transitory computer-readable medium of claim 14 , further comprising allowing a client devices to connect, through a traffic distributor, to both the first WGB and the second WGB.

Assignees

• Cisco Tech Inc

Inventors

• Liu Jun
• Yang Qiang
• Li Jiewei
• Ke Xia

Classifications

• H04W84/12

  WLAN [Wireless Local Area Networks] · CPC title

• H04W48/16 Primary

  Discovering, processing access restriction or access information · CPC title

• H04W36/0088 Primary

  Scheduling hand-off measurements · CPC title

• H04W4/20

  Services signaling; Auxiliary data signalling, i.e. transmitting data via a non-traffic channel · CPC title

• H04W36/0061

  of neighbour cell information · CPC title