Collision Avoidance Systems and Methods

• US 20070115853A1
• Filed: 11/08/2006
• Published: 05/24/2007
• Est. Priority Date: 11/08/2005
• Status: Active Grant

• Current Assignee: Intellectual Ventures I LLC (Intellectual Ventures LLC)
• Original Assignee: Conexant Systems Incorporated (Synaptics Incorporated)
• Inventors: Wentink, Menzo
• Granted Patent: US 8,374,123 B2
• Time in Patent Office: Days
• US Class Current: 370/252
• CPC Class Codes: H04L 1/1607 Details of the supervisory signal
• CPC Class Codes: H04N 21/4126 The peripheral being portable, e.g. PDAs or mobile phones
• CPC Class Codes: H04W 74/04 Scheduled access hybrid access H04W74/02
• CPC Class Codes: H04W 74/08 Non-scheduled access, e.g. ALOHA hybrid access H04W74/02
• CPC Class Codes: H04W 74/0816 with collision avoidance
• CPC Class Codes: H04W 74/0866 using a dedicated channel for access
• CPC Class Codes: H04W 84/12 WLAN [Wireless Local Area Networks]
• CPC Class Codes: H04W 92/10 between terminal device and access point, i.e. wireless air interface

Abstract

Disclosed herein are various embodiments of collision avoidance systems and methods. One method embodiment, among others, comprises a client sending an end of transmission (EOT) request to an access point (AP), and responsive to the EOT request, the AP responding with an EOT frame.

Claims

1. A method, comprising:

a client sending an end of transmission (EOT) request to an access point (AP); and

responsive to the EOT request, the AP responding with an EOT frame.

2. The method of claim 1, wherein the client sending the EOT request comprises the client sending a CF-end frame.

3. The method of claim 2, wherein the CF-end frame comprises a basic service set identification (BSSID).

4. The method of claim 1, wherein the client sending the EOT request comprises the client sending the EOT request at one of a basic rate and a non-basic rate.

5. The method of claim 1, wherein the AP responding with an EOT frame comprises the AP sending a CF-end frame.

6. The method of claim 5, wherein the CF-end frame comprises a basic service set identification (BSSID).

7. The method of claim 6, wherein the BSSID matches a BSSID corresponding to the EOT request.

8. A method, comprising:

a client sending a request to send (RTS) frame to an access point (AP) at a suitable rate to reach the AP; and

the AP setting a network allocation vector (NAV) by sending a clear to send (CTS) frame that can be decoded by all nodes in an associated network.

9. The method of claim 8, wherein the network comprises a basic service set.

10. A method, comprising:

an access point (AP) sending a short frame preceding the start of a transmit opportunity (TXOP) to a client to set a network allocation vector (NAV); and

the AP sending the TXOP.

11. The method of claim 10, wherein the AP sending a short frame comprises the AP sending a clear to send (CTS) frame.

12. A method, comprising:

an access point (AP) sending a transmit opportunity (TXOP); and

the AP sending a short frame at the end of the TXOP to the client to avoid an extended interval frame space (EIFS) interval.

13. The method of claim 12, wherein the AP sending the short frame at the end of the TXOP comprises the AP sending an end of transmission (EOT) frame.

14. A system, comprising:

client logic configured to send an end of transmission (EOT) request to an access point (AP); and

responsive to the EOT request, AP logic configured to respond with an EOT frame.

15. The system of claim 14, wherein the EOT request and the EOT frame each comprise a CF-end frame.

16. The system of claim 15, wherein the CF-end frame comprises a basic service set identification (BSSID).

17. The system of claim 16, wherein the BSSID of the CF-frame matches the BSSID of the EOT request.

18. A method, comprising:

receiving an end of transmission (EOT) request; and

responsive to the EOT request, responding with an EOT frame.

19. The method of claim 18, wherein the EOT request and the EOT frame each comprise a CF-end frame, the EOT frame and EOT request having matching basic service set identifications (BSSID).

20. A method, comprising:

sending an end of transmission (EOT) request; and

receiving an EOT frame in response to the EOT request.

21. The method of claim 20, wherein the EOT request and the EOT frame each comprise a CF-end frame, the EOT frame and EOT request having matching basic service set identifications (BSSID).

22. A system, comprising:

logic configured to receive an end of transmission (EOT) request, and responsive to the EOT request, respond with an EOT frame.

23. The system of claim 22, further comprising second logic configured to send the EOT request.

24. A system, comprising:

logic configured to send an end of transmission (EOT) request, and receive an EOT frame in response to the EOT request.

25. The system of claim 24, further comprising second logic configured to send the EOT frame.