Method and apparatus for retransmission

1. An access point device for wireless communication with a client station, the access point device comprising:

a transceiver configured to transmit and receive wireless signals; and

a processing circuit configured to:

perform a scheduled transmission of data units to a station device;

detect errors in the scheduled transmission of data units;

upon detection of an error that affects access to a full channel for the scheduled transmission, invoke a backoff procedure to defer an access to the channel and to adjust a size of a contention window, the contention window defining a period of time during which a network allows transmission of data units simultaneously across multiple nodes of the network, for the backoff procedure to gain another access to a next channel;

in the absence of errors affecting access to the full channel being detected, not invoke the backoff procedure; and

perform retransmission of the scheduled transmission in the next channel access.

2. The access point device of claim 1 , wherein the processing circuit is configured to double the size of the contention window upon detection of the error that affects access to the full channel.

3. The access point device of claim 1 , wherein the processing circuit is configured to detect an error of a previous scheduled transmission of data units from the access point device to the station device that provides scheduled resources for transmission between the access point device and the station device.

4. The access point device of claim 3 , wherein the processing circuit is configured to determine resources that are scheduled by the station device for the access point device to perform retransmission.

5. The access point device of claim 3 , wherein the processing circuit is configured to determine whether the error affects a full channel or only a sub channel.

6. The access point device of claim 5 , wherein the processing circuit is configured to:

detect the error of the previous scheduled transmission at the sub channel level.

7. The access point device of claim 6 , wherein the processing circuit is configured to:

provide the data units of the previous scheduled transmission to the transceiver for retransmission using the scheduled resources.

8. The access point device of claim 3 , wherein the processing circuit is configured to:

provide a request frame to the transceiver to send a resource request for retransmission to the station device.

9. The access point device of claim 8 , wherein the processing circuit is configured to:

receive a signal indicative of the resources that are scheduled by the station device for retransmission.

10. The access point device of claim 9 , wherein the processing circuit is configured to:

provide one or more of the data units in the previous scheduled transmission to the transceiver for retransmission using the scheduled resources.

11. A method for wireless communication between an access point and a client station, the method comprising:

transmitting and receiving wireless signals by a transceiver of an access point device;

performing, by the access point device, a scheduled transmission of data units to a station device;

detecting errors in the scheduled transmission of data units;

upon detection of an error that affects access to a full channel for the scheduled transmission, invoking a backoff procedure to defer an access to the channel and adjusting a size of a contention window, the contention window defining a period of time during which a network allows transmission of data units simultaneously across multiple nodes of the network, for the backoff procedure to gain another access to a next channel;

in the absence of errors affecting access to the full channel being detected, bypassing the backoff procedure; and

performing retransmission of the scheduled transmission in the next channel access.

12. The method of claim 11 , the method further comprises doubling the size of the contention window upon detection of the error that affects access to the full channel.

13. The method of claim 11 , the method further comprises detecting an error of a previous scheduled transmission of data units from the access point device to the station device that provides scheduled resources for transmission between the access point device and the station device.

14. The method of claim 13 , the method further comprises determining resources that are scheduled by the station device for the access point device to perform retransmission.

15. The method of claim 13 , the method further comprises determining whether the error affects a full channel or only a sub channel.

16. The method of claim 15 , the method further comprises detecting the error of the previous scheduled transmission at the sub channel level.

17. The method of claim 16 , the method further comprises providing the data units of the previous scheduled transmission to the transceiver for retransmission using the scheduled resources.

18. The method of claim 13 , the method further comprises providing a request frame to the transceiver to send a resource request for retransmission to the station device.

19. The method of claim 18 , the method further comprises receiving a signal indicative of the resources that are scheduled by the station device for retransmission.

20. The method of claim 19 , the method further comprises providing one or more of the data units in the previous scheduled transmission to the transceiver for retransmission using the scheduled resources.