Deterministic backoff with dynamic adaptation

• US 8,498,275 B2
• Filed: 10/28/2010
• Issued: 07/30/2013
• Est. Priority Date: 10/30/2009
• Status: Active Grant

• Current Assignee: Qualcomm, Inc.
• Original Assignee: Qualcomm, Inc.
• Inventors: Wentink, Maarten Menzo
• Primary Examiner(s): BLANTON, JOHN D
• Application Number:
  US12/914,455
• Publication Number:
  US 20110103352A1
• Time in Patent Office: 1,006 Days
• Field of Search: None
• US Class Current: 370/336
• CPC Class Codes: H04W 74/008 with additional processing of random access related information at receiving side
• CPC Class Codes: H04W 74/0816 with collision avoidance
• CPC Class Codes: H04W 74/0833 Random access procedures, e.g. with 4-step access
• CPC Class Codes: H04W 74/085 collision avoidance

Abstract

Certain aspects provide techniques for conveying transmit opportunity (TXOP) scheduling information that can be used by a plurality of wireless nodes to determine TXOPs for sending transmissions.

Claims

1. A method for wireless communications, comprising:

receiving, on a contention access (CA) channel, a transmission containing downlink data, a block acknowledgment request (BAR), and transmit opportunity (TXOP) scheduling information, wherein the TXOP scheduling information comprises a deterministic slot count;

determining a TXOP based, at least in part, on the scheduling information and one or more monitored clear channel assessment (CCA) busy events; and

sending a transmission during the determined TXOP.

2. The method of claim 1, wherein the one or more monitored CCA busy events comprise an end of a TXOP of one of a plurality of wireless nodes.

3. The method of claim 1, wherein the scheduling information comprises a backoff value for each of a plurality of wireless nodes, the backoff value for each wireless node indicating when the wireless node should send a transmission after a CCA busy event.

4. The method of claim 3, further comprising:

adjusting a backoff value after a CCA busy event.

5. The method of claim 4, wherein the adjusting comprises:

adjusting the backoff value based, at least in part, on a node index and a number of the CCA busy event.

6. An apparatus for wireless communications, comprising:

a receiver configured to receive, on a contention access (CA) channel, a transmission containing downlink data, a block acknowledgment request (BAR), and transmit opportunity (TXOP) scheduling information, wherein the TXOP scheduling information comprises a deterministic slot count;

a scheduler configured to determine a TXOP based, at least in part, on the scheduling information and one or more monitored clear channel assessment (CCA) busy events; and

a transmitter configured to send a transmission during the determined TXOP.

7. The apparatus of claim 6, wherein the one or more monitored CCA busy events comprise an end of a TXOP of one of a plurality of wireless nodes.

8. The apparatus of claim 6, wherein the scheduling information comprises a backoff value for each of a plurality of wireless nodes, the backoff value for each wireless node indicating when the wireless node should send a transmission after a CCA busy event.

9. The apparatus of claim 8, further comprising:

adjusting a backoff value after a CCA busy event.

10. The apparatus of claim 9, wherein adjusting a backoff value after a CCA busy event comprises:

adjusting the backoff value based, at least in part, on a node index and a number of the CCA busy event.

11. An apparatus, comprising:

means for receiving, on a contention access (CA) channel, a transmission containing downlink data, a block acknowledgment request (BAR), and transmit opportunity (TXOP) scheduling information, wherein the TXOP scheduling information comprises a deterministic slot count;

means for determining a TXOP based, at least in part, on the scheduling information and one or more monitored clear channel assessment (CCA) busy events; and

means for sending a transmission during the determined TXOP.

12. The apparatus of claim 11, wherein the one or more monitored CCA busy events comprise an end of a TXOP of one of a plurality of wireless nodes.

13. The apparatus of claim 11, wherein the scheduling information comprises a backoff value for each of a plurality of wireless nodes, the backoff value for each wireless node indicating when the wireless node should send a transmission after a CCA busy event.

14. The apparatus of claim 13, further comprising:

means for adjusting a backoff value after a CCA busy event.

15. The apparatus of claim 14, wherein the means for adjusting is configured to adjust the backoff value based, at least in part, on a node index and a number of the CCA busy event.

16. A computer-program product for wireless communications, comprising a non-transitory computer-readable medium comprising instructions executable by an apparatus to:

receive, on a contention access (CA) channel, a transmission containing downlink data, a block acknowledgment request (BAR), and transmit opportunity (TXOP) scheduling information, wherein the TXOP scheduling information comprises a deterministic slot count;

determine a TXOP based, at least in part, on the scheduling information and one or more monitored clear channel assessment (CCA) busy events; and

send a transmission during the determined TXOP.

17. A wireless station, comprising:

at least one antenna;

a receiver configured to receive, via the at least one antenna, on a contention access (CA) channel, a transmission containing downlink data, a block acknowledgment request (BAR), and transmit opportunity (TXOP) scheduling information, wherein the TXOP scheduling information comprises a deterministic slot count;

a scheduler configured to determine a TXOP based, at least in part, on the scheduling information and one or more monitored clear channel assessment (CCA) busy events; and

a transmitter configured to send, via the at least one antenna, a transmission during the determined TXOP.

18. A method for wireless communications, comprising:

transmitting, on a contention access (CA) channel, one or more transmissions, each transmission containing downlink data, a block acknowledgment request (BAR), and transmit opportunity (TXOP) scheduling information, wherein the TXOP scheduling information comprises a deterministic slot count; and

receiving transmissions from a plurality of wireless nodes during TXOPs determined, at least in part, based on the scheduling information and one or more monitored clear channel assessment (CCA) busy events.

19. The method of claim 18, wherein the one or more monitored CCA busy events comprise an end of a TXOP of one of the plurality of wireless nodes.

20. The method of claim 18, wherein the scheduling information comprises a backoff value for each wireless node, the backoff value for each wireless node indicating when the wireless node should send a transmission after a CCA busy event.

21. An apparatus for wireless communications, comprising:

a transmitter configured to transmit, on a contention access (CA) channel, one or more transmissions, each transmission containing downlink data, a block acknowledgment request (BAR), and transmit opportunity (TXOP) scheduling information, wherein the TXOP scheduling information comprises a deterministic slot count; and

a receiver configured to receive transmissions from a plurality of wireless nodes during TXOPs determined, at least in part, based on the scheduling information and one or more monitored clear channel assessment (CCA) busy events.

22. The apparatus of claim 21, wherein the one or more monitored CCA busy events comprise an end of a TXOP of one of the plurality of wireless nodes.

23. The apparatus of claim 21, wherein the scheduling information comprises a backoff value for each wireless node, the backoff value for each wireless node indicating when the wireless node should send a transmission after a CCA busy event.

24. An apparatus for wireless communications, comprising:

means for transmitting, on a contention access (CA) channel, one or more transmissions, each transmission containing downlink data, a block acknowledgment request (BAR), and transmit opportunity (TXOP) scheduling information, wherein the TXOP scheduling information comprises a deterministic slot count; and

means for receiving transmissions from a plurality of wireless nodes during TXOPs determined, at least in part, based on the scheduling information and one or more monitored clear channel assessment (CCA) busy events.

25. The apparatus of claim 24, wherein the one or more monitored CCA busy events comprise an end of a TXOP of one of the plurality of wireless nodes.

26. The apparatus of claim 24, wherein the scheduling information comprises a backoff value for each wireless node, each backoff value indicating when a corresponding wireless node should send a transmission after a CCA busy event.

27. A computer-program product for wireless communications, comprising a non-transitory computer-readable medium comprising instructions executable by an apparatus to:

transmit, on a contention access (CA) channel, one or more transmissions, each transmission containing downlink data, a block acknowledgment request (BAR), and transmit opportunity (TXOP) scheduling information, wherein the TXOP scheduling information comprises a deterministic slot count; and

receive transmissions from a plurality of wireless nodes during TXOPs determined, at least in part, based on the scheduling information and one or more monitored clear channel assessment (CCA) busy events.

28. An access point, comprising:

at least one antenna;

a transmitter configured to transmit, via the at least one antenna, on a contention access (CA) channel, one or more transmissions, each transmission containing downlink data, a block acknowledgment request (BAR), and transmit opportunity (TXOP) scheduling information, wherein the TXOP scheduling information comprises a deterministic slot count; and

a receiver configured to receive transmissions from a plurality of wireless nodes during TXOPs determined, at least in part, based on the scheduling information and one or more monitored clear channel assessment (CCA) busy events.