Method and system for recovery from access point infrastructure link failures

• US 20060153085A1
• Filed: 12/27/2004
• Published: 07/13/2006
• Est. Priority Date: 12/27/2004
• Status: Abandoned Application

• Current Assignee: Symbol Technologies, Inc. (Zebra Technologies Corporation)
• Original Assignee: Symbol Technologies, Inc. (Zebra Technologies Corporation)
• Inventors: Vollkommer, Richard M., Willins, Bruce A.
• Application Number:
  US11/022,749
• Publication Number:
  US 20060153085A1
• Time in Patent Office: Days
• US Class Current: 370/242
• CPC Class Codes: H04W 24/04 Arrangements for maintaining operational condition
• CPC Class Codes: H04W 28/14 using intermediate storage
• CPC Class Codes: H04W 76/20 Manipulation of established connections
• CPC Class Codes: H04W 84/10 Small scale networks; Flat hierarchical networks
• CPC Class Codes: H04W 92/12 between access points and access point controllers
• CPC Class Codes: H04W 92/20 between access points

Abstract

Described is a method for detecting a link fault between a first access point and an infrastructure, the first access point providing a wireless connection for a station to the infrastructure and suspending communication between the station and the first access point. A wireless connection is then established between the first access point and a second access point, wherein the second access point has an active link to the infrastructure. Infrastructure frames are received at the first access point from the second access point, the first access point storing the infrastructure frames in a queue. Communication is resumed between the first access point and the station, the first access point transmitting the infrastructure frames to the station.

Claims

1. A method, comprising the steps of:

detecting a link fault between a first access point and an infrastructure, the first access point providing a wireless connection for a station to the infrastructure;

suspending communication between the station and the first access point;

establishing a wireless connection between the first access point and a second access point, wherein the second access point has an active link to the infrastructure;

receiving infrastructure frames at the first access point from the second access point, the first access point storing the infrastructure frames in a queue; and

resuming communication between the first access point and the station, the first access point transmitting the infrastructure frames to the station.

2. The method according to claim 1 wherein the step of resuming communication between the first access point and the station, further comprises:

receiving station frames at the first access point from the station, the first access point storing the station frames in the queue.

3. The method according to claim 1, further comprising:

transmitting station frames from the first access point to the second access point.

4. The method according claim 3, wherein the second access point stores the station frames in the queue and transmits the station frames to the infrastructure.

5. The method according to claim 1 wherein the step of suspending communications between the station and the first access point further comprises:

entering the first access point into a contention free period.

6. The method according to claim 1 wherein the step of establishing a wireless connection between the first access point and a second access point further comprises:

entering the first access point into a station emulation mode with the second access point; and

switching the first access point to communicate on a same channel as the second access point.

7. The method according to claim 1 further comprising:

entering the first access point into a fault recovery diagnostic mode; and

notifying the infrastructure of the link fault.

8. The method according to claim 7 wherein the step of notifying the infrastructure of the link fault further comprises:

sending an SNMP trap to the infrastructure.

9. The method according to claim 1 further comprising:

transmitting the infrastructure frames from the infrastructure to the second access point; and

queuing the infrastructure frames at the second access point.

10. The method according to claim 1 further comprising:

suspending communications between the first access point and the second access point by entering the first access point into a power save polling mode.

11. The method according to claim 10 further comprising:

resuming communications between the first access point and the second access point, wherein the first access point leaves the power save polling mode.

12. A system comprising:

a station including a wireless connection to an infrastructure;

a first access point to provide the wireless connection for the station to the infrastructure, wherein, when the first access point detecting a link fault between the first access point and the infrastructure, the first access point suspends communication with the station; and

a second access point having an active link to the infrastructure, wherein, upon detection of the link fault, a wireless connection between the first access point and the second access point is established, the second access point transmitting in infrastructure frames to the first access point and the first access point storing the frames in a queue, the infrastructure frames being subsequently transmitted by the first access point communication between the station and the first access point.

13. The system according to claim 12, wherein, upon resuming communication between the station and the first access point, the station transmits station frames to the first access point.

14. The system according to claim 12, wherein the first access point transmits station frames to the second access point, the second access point storing the frames in a queue, and the second access point stores the station frames in a queue, and further transmits the station frames to the infrastructure.

15. The system according to claim 12, wherein the first access point suspends communications by entering into a contention free period.

16. The system according to claim 12, wherein the wireless connection is established by the first access point entering into a station emulation mode with the second access point and communicating on a same channel as the second access point.

17. An access point comprising:

a memory to store a set of instructions;

a processor to execute the set of instructions, the set of instructions performing the steps of;

detecting a link fault between the access point and an infrastructure;

suspending communication between a station and the access point;

entering the access point into a first mode in which the access point transmits station frames to a further access point and receives infrastructure frames from the further access point; and

entering the access point into a second mode in which the access point resumes communication with the station.

18. The access point according to claim 17, wherein the entering into the first mode includes establishing a wireless connection between the access point and the further access point.

19. The access point according to claim 17, wherein the entry into the first mode includes storing the frames in a queue.

20. The access point of claim 17, wherein the first mode is exclusive of the second mode.

21. The access point of claim 17, wherein resuming communication of the second mode includes:

transmitting infrastructure frames to the station; and

receiving station frames from the station.

22. The access point according to claim 17, wherein the suspending communications step includes entering the access point into a contention free period.

23. The access point according to claim 17, wherein the entering into the first mode include entering the access point into a station emulation mode with the further access point and communicating on a same channel as the further access point.

24. The access point according to claim 17, the instructions further comprising entering the first access point into a fault recovery diagnostic mode and notifying the infrastructure of the link fault.

25. The access point according to claim 17, wherein the entering into the first mode includes suspending communications between the access point and the further access point by entering the access point into a power save polling mode.