Selective protection based on sequence numbers in coexisting networks

• US 8,761,147 B2
• Filed: 01/17/2012
• Issued: 06/24/2014
• Est. Priority Date: 01/17/2011
• Status: Active Grant

• Current Assignee: Texas Instruments, Inc.
• Original Assignee: Texas Instruments, Inc.
• Inventors: Sun, Yanjun, Xhafa, Ariton E., Vedantham, Ramanuja, Peery, Josef, Lu, Xiaolin, Sella, Assaf
• Primary Examiner(s): Ton, Dang
• Assistant Examiner(s): Aung, Sai
• Application Number:
  US13/351,846
• Publication Number:
  US 20120184330A1
• Time in Patent Office: 889 Days
• Field of Search: 370345-347, 370/428, 370/443, 370/235, 370/338, 370/312, 370/394, 714710-712, 714746-748, 725/86, 725/90
• US Class Current: 370/347
• CPC Class Codes: H04L 1/1809 Selective-repeat protocols
• CPC Class Codes: H04L 47/34 ensuring sequence integrity, e.g. using sequence numbers
• CPC Class Codes: H04W 72/1215 for collaboration of different radio technologies
• CPC Class Codes: H04W 74/0816 with collision avoidance
• CPC Class Codes: H04W 88/06 adapted for operation in multiple networks or having at least two operational modes, e.g. multi-mode terminals

Abstract

A wireless device comprises a first wireless transceiver, a second wireless transceiver, and control logic. The control logic is coupled to the first wireless transceiver and the second wireless transceiver. The control logic is configured to determine whether to transmit protection frames (e.g., clear-to-send 2 self frames) based upon sequence numbers in frames received from another device.

Claims

1. A combo wireless device, comprising:

a first wireless transceiver configured to send and receive wireless communications in accordance with a first wireless protocol;

a second wireless transceiver configured to send and receive wireless communications in accordance with a second wireless protocol, said second wireless protocol coexisting with said first wireless protocol;

a control logic coupled to and coordinates the operation of said first and second wireless transceivers,

wherein said control logic determines whether to transmit clear-to-send 2 self (C2S) frames based upon media access control (MAC) sequence numbers in frames received from another device, the control logic dynamically enables and disables transmission of C2S frames,

clears an enable flag and coordinates beginning transmitting clear-to-send 2 self (C2S) frames upon determining that more than a threshold period of time has elapsed without detecting any missing MAC sequence numbers in wireless frames or upon determining that more than a threshold number of wireless frames have been received without a missing MAC sequence number.

2. The combo wireless device of claim 1 wherein, after disabling clear-to-send 2 self (C2S) frame transmission, said control logic enables protection frame transmission upon detecting a predefined number of missing MAC sequence numbers in a wireless frame.

3. The combo wireless device of claim 2 wherein said predefined number is 1.

4. The combo wireless device of claim 1 wherein said control logic sets an enable flag upon detecting a missing MAC sequence number in a wireless frame.

5. The combo wireless device of claim 1 wherein, upon receiving a frame with a MAC sequence number at a predefined MAC sequence number threshold, said control logic automatically enables clear-to-send 2 self (C2S) frame transmission.

6. The combo wireless device of claim 5 wherein the predefined MAC sequence number threshold is the maximum permitted MAC sequence number after which the MAC sequence number resets to 0.

7. The combo wireless device of claim 5 wherein the control logic ceases automatically enabling clear-to-send 2 self (C2S) frame transmission upon determining a maximum permitted MAC sequence number value.

8. The combo wireless device of claim 1 wherein the first wireless transceiver is a BLUETOOTH transceiver and the second wireless transceiver is a wireless local area network (WLAN) transceiver.

9. A combo wireless device, comprising:

a first wireless transceiver configured to send and receive wireless communications in accordance with a first wireless protocol;

a second wireless transceiver configured to send and receive wireless communications in accordance with a second wireless protocol, said second wireless protocol coexisting with said first wireless protocol;

a control logic coupled to and coordinates the operation of said first and second wireless transceivers,

wherein said control logic disables transmission of clear-to-send 2 self (C2S) frames upon determining that more than a threshold period of time has elapsed without detecting any missing media access control (MAC) sequence numbers in wireless frames or upon determining that more than a threshold number of wireless frames have been received without a missing MAC sequence number, and

clears a C2S enable flag upon determining that more than a threshold period of time has elapsed without detecting any missing MAC sequence numbers in wireless frames or upon determining that more than a threshold number of wireless frames have been received without a missing MAC sequence number.

10. The combo wireless device of claim 9 wherein, after disabling C2S frame transmission, said control logic enables C2S frame transmission upon detecting a missing MAC sequence number in a wireless frame.

11. The combo wireless device of claim 10 wherein said control logic also sets a C2S enable flag upon detecting a missing MAC sequence number in a wireless frame.

12. The combo wireless device of claim 9 wherein, upon receiving a frame with a MAC sequence number at a predefined MAC sequence number threshold, said control logic automatically enables C2S frame transmission.

13. The combo wireless device of claim 12 wherein the predefined MAC sequence number threshold is the maximum permitted MAC sequence number after which the MAC sequence number resets to 0.

14. The combo wireless device of claim 12 wherein the control logic ceases automatically enabling C2S frame transmission upon determining a maximum permitted MAC sequence number value.

15. A method for selective protection of combo devices in coexisting networks, comprising:

receiving a plurality of wireless frames in accordance with wireless protocols by a combo device, said wireless frames may contain or may be missing a media access control (MAC) sequence number;

determining to begin transmitting clear-to-send 2 self (C2S) frames based upon said MAC sequence number in wireless frames;

clearing a clear-to-send 2 self (C2S) enable flag upon determining that more than a threshold period of time has elapsed without detecting any missing MAC sequence number in wireless frames or upon determining that more than a threshold number of wireless frames have been received without a missing MAC sequence number; and

determining whether to enable or disable transmission of clear-to-send 2 self (C2S) frames from the combo device based on said MAC sequence number.

16. The method of claim 15 further comprising enabling transmission of clear-to-send 2 self (C2S) frames from the combo device based on a determination that a MAC sequence number has been missed.

17. The method of claim 16 further comprising setting an enable flag based on the determination that a MAC sequence number has been missed.

18. The method of claim 15 further comprising disabling clear-to-send 2 self (C2S) frame transmission frames from the combo device based on an enable flag being set and no MAC sequence numbers have been missed for more than a threshold period of time or for more than threshold number of frames.