Methods for detecting rejoining nodes in an IBSS

• US 9,307,567 B2
• Filed: 02/11/2014
• Issued: 04/05/2016
• Est. Priority Date: 10/28/2013
• Status: Expired due to Fees

• Current Assignee: Qualcomm, Inc.
• Original Assignee: Qualcomm, Inc.
• Inventors: Yenganti, Pradeep Kumar, Kurian, Lawrie, Karmuchi, Shailender P., Joshi, Ravi Arun
• Primary Examiner(s): Phan, Tri H
• Application Number:
  US14/178,018
• Publication Number:
  US 20150117326A1
• Time in Patent Office: 784 Days
• Field of Search: 370/236, 370/252, 370310-350, 370/395.2, 370/396, 370/400, 370/431, 370/437, 370461-462, 455/41.2, 455/434, 455/456.2, 455/515, 709208-209, 709223-224, 709227-229, 709/248
• US Class Current: 1/1
• CPC Class Codes: H04L 43/10 Active monitoring, e.g. heartbeat, ping or trace-route
• CPC Class Codes: H04W 40/248 Connectivity information update
• CPC Class Codes: H04W 76/14 Direct-mode setup
• CPC Class Codes: H04W 76/19 Connection re-establishment
• CPC Class Codes: H04W 84/18 Self-organising networks, e.g. ad-hoc networks or sensor networks

Abstract

Methods, systems, and devices are described for wireless communication. In one method, a first node of an independent basic service set (IBSS) may receive a beacon from a second node of the IBSS. The beacon may include a token. Based at least in part on the token, the first node may determine that the second node has disconnected from and rejoined the IBSS. In another method, a token may be generated at a node. The token may indicate that the node has disconnected from and rejoined an IBSS. A beacon including the token may be transmitted to the IBSS responsive to the node rejoining the IBSS.

Claims

1. A method of wireless communication, comprising:

receiving, by a first node of an independent basic service set (IBSS), a beacon from a second node of the IBSS, the beacon comprising a token; and

determining, based at least in part on the token, that the second node has disconnected from and rejoined the IBSS.

2. The method of claim 1, wherein the token comprises a first token, the method further comprising:

comparing the first token to a second token associated with the second node;

wherein determining that the second node has disconnected from and rejoined the IBSS is based at least in part on a difference between the first token and the second token.

3. The method of claim 2, wherein the second token associated with the second node comprises a previously received token from the second node.

4. The method of claim 1, further comprising:

reclaiming a set of resources allocated to a connection between the first node and the second node responsive to the determination that the second node has disconnected from and rejoined the IBSS.

5. The method of claim 4, wherein reclaiming the set of resources allocated to the connection between the first node and the second node comprises:

tearing down the connection between the first node and the second node.

6. The method of claim 1, further comprising:

setting up a new connection with the second node responsive to the determination that the second node has disconnected from and rejoined the IBSS.

7. The method of claim 6, further comprising:

associating the token of the beacon from the second node with the new connection.

8. The method of claim 6, further comprising:

updating an expected sequence number for the second node in response to determining that the second node has disconnected from and rejoined the IBSS.

9. The method of claim 1, wherein the beacon from the second node is received during a monitoring period prior to expiration of a timer associated with detecting disconnection of the second node.

10. The method of claim 1, wherein the beacon from the second node comprises an integer value of a counter.

11. A device for wireless communication, comprising:

a receiver configured to receive a beacon from a node of an independent basic service set (IBSS), the beacon comprising a token; and

an IBSS connection manager configured to determine, based at least in part on the token, that the node has disconnected from and rejoined the IBSS.

12. The device of claim 11, wherein the token comprises a first token, and the IBSS connection manager is further configured to:

compare the first token to a second token associated with the node;

wherein the determination that the node has disconnected from and rejoined the IBSS is based at least in part on a difference between the first token and the second token.

13. The device of claim 12, wherein the second token associated with the node comprises a previously received token from the node.

14. The device of claim 12, wherein the IBSS connection manager is further configured to:

reclaim a set of resources allocated to a connection between the device and the node responsive to the determination that the node has disconnected from and rejoined the IBSS.

15. The device of claim 14, wherein the IBSS connection manager is further configured to:

tear down the connection between the device and the node, and set up a new connection with the node responsive to the determination that the node has disconnected from and rejoined the IBSS.

16. The device of claim 11, wherein the IBSS connection manager is further configured to:

set up a new connection with the node responsive to the determination that the node has disconnected from and rejoined the IBSS.

17. The device of claim 16, wherein the IBSS connection manager is further configured to:

associate the token of the beacon from the node with the new connection.

18. The device of claim 16, wherein the IBSS connection manager is further configured to:

update an expected sequence number for the node in response to determining that the node has disconnected from and rejoined the IBSS.

19. The device of claim 11, wherein the beacon from the node is received during a monitoring period prior to expiration of a timer associated with detecting the disconnection of the node.

20. The device of claim 11, wherein the beacon from the node comprises an integer value of a counter.

21. A method of wireless communication, comprising:

generating a token at a node, the token indicating that the node has disconnected from and rejoined an independent basic service set (IBSS); and

transmitting a beacon comprising the token to the IBSS responsive to the node rejoining the IBSS.

22. The method of claim 21, wherein the token comprises a first token and generating the token comprises:

generating the first token based at least in part on a second token associated with at least one previous connection of the node over the IBSS.

23. The method of claim 22, wherein generating the first token further comprises:

incrementing the second token according to a predefined pattern to generate the first token.

24. The method of claim 21, further comprising:

setting up a new connection with at least a second node of the IBSS responsive to transmitting the beacon comprising the token to the IBSS.

25. The method of claim 21, wherein the beacon is transmitted prior to an expiration of a monitoring period associated with detecting disconnection of the node from the IBSS.

26. A device for wireless communication, comprising:

an independent basic service set (IBSS) connection manager configured to generate a token, the token indicating that the device has disconnected from and rejoined an IBSS; and

a transmitter configured to transmit a beacon comprising the token to the IBSS responsive to the device rejoining the IBSS.

27. The device of claim 26, wherein the token comprises a first token and the IBSS connection manager is further configured to:

generate the first token based at least in part on a second token associated with at least one previous connection of the device over the IBSS.

28. The device of claim 27, wherein the IBSS connection manager is further configured to:

increment the second token according to a predefined pattern to generate the first token.

29. The device of claim 26, wherein the IBSS connection manager is further configured to:

set up a new connection with at least a second device of the IBSS responsive to transmitting the beacon comprising the token to the IBSS.

30. The device of claim 26, wherein the beacon is transmitted prior to an expiration of a monitoring period associated with detecting disconnection of the device from the IBSS.