Electronic device for use in radio communication, method, and computer-readable storage medium including an adjustment of contention window size

1 . An electronic apparatus for wireless communications, comprising:

a processing circuit configured to:

transmit data;

acquire hybrid automatic repeat request (HARQ) feedback values of the transmitted data; and

based on the HARQ feedback values, adjust a contention window size (CWS), and perform carrier sensing based on the CWS before a next data transmission,

wherein the processing circuit is further configured to:

adjust the CWS based on a determination result obtained based on the HARQ feedback values, and

determine whether there is another node based on HARQ feedback values of reference data and information about a channel between the electronic apparatus and a user equipment that is received from the user equipment,

wherein the reference data is transmitted within a first duration serving as a reference duration in a channel occupancy time (COT) among the transmitted data.

2 . The electronic apparatus according to claim 1 ,

wherein the information about the channel is received together with the HARQ feedback values or is received through the HARQ feedback values, and

wherein the information of the channel is an energy detection threshold.

3 . The electronic apparatus according to claim 2 ,

wherein the processing circuit is configured to determine that there is the other node and update the CWS in a case that the energy detection threshold is less than or equal to a predetermined energy detection threshold and the HARQ feedback values of the reference data are NACK, and

wherein the processing circuit is configured to determine that there is the other node and maintain the CWS in a case that the energy detection threshold is greater than the predetermined energy detection threshold and the HARQ feedback values of the reference data are NACK.

4 . The electronic apparatus according to claim 1 , the processing circuit is configured to transmit the data on an unauthorized frequency band.

5 . The electronic apparatus according to claim 1 ,

wherein the detemination result obtained based on the HARQ feedback values is an indication whether there is the another node, and the determination result based on the HARQ feedback values is determined based on one of a first scenario, a second scenario or a third scenario,

wherein in the first scenario, the processing circuit is configured to determine whether there is the another node based on HARQ feedback values of at least part of non-reference data transmitted within a channel occupation time (COT), wherein the non-reference data is data transmitted within each duration in the COT other than a first duration serving as a reference duration,

wherein in the second scenario, the processing circuit is configured to determine whether there is the another node based on HARQ feedback values of reference data and information about a channel between the electronic apparatus and a user equipment that is received from the user equipment,

wherein the reference data is transmitted by the user equipment within a first duration serving as a reference duration in a channel occupation time (COT) among the transmitted data, and

wherein in the third scenario, the processing circuit is configured determine whether there is the another node based on a change rate of a second ratio with respect to a first ratio, wherein the processing circuit is configured to transmit the data in unit of a code block, wherein the first ratio is a ratio of NACK in first HARQ feedback values that correspond to a case where the code block is initially transmitted, and the second ratio is a ratio of NACK in second HARQ feedback values that correspond to a case where the code block is retransmitted.

6 . The electronic apparatus according to claim 5 ,

wherein, in the first scenario, the processing circuit is configured to:

determine, in a case that the HARQ feedback values of all non-reference data transmitted in the COT are NACK, that there is the another node, and otherwise determine that there is no another node, or

determine, in a case that a ratio of the number of HARQ feedback values that are NACK among all HARQ feedback values of the non-reference data transmitted in the COT to a total number of all HARQ feedback values is greater than or equal to a predetermined ratio threshold, that there is the another node, and otherwise determine that there is no another node, or

determine, in a case that HARQ feedback values of non-reference data first transmitted in time among the non-reference data transmitted in the COT are ACK, that there is no another node, and otherwise determine that there is the another node, or determine, in a case that HARQ feedback values of non-reference data last transmitted in time among the non-reference data transmitted in the COT are ACK, that there is no another node, and otherwise determine that there is the another node, or

determine, in a case that there is at least one ACK in the HARQ feedback values of the non-reference data transmitted in the COT, that there is no another node, and otherwise determine that there is the another node.

7 . The electronic apparatus according to claim 5 ,

wherein, in the first scenario, the processing circuit is configured to adjust the CWS further based on the HARQ feedback values of reference data,

wherein the reference data is transmitted within the reference duration in the COT among the transmitted data.

8 . The electronic apparatus according to claim 7 ,

wherein the processing circuit is configured to set the CWS to be a predetermined CWS minimum in a case that the HARQ feedback values of the reference data are ACK, or

wherein the processing circuit is configured to update the CWS in a case that the HARQ feedback values of the reference data are NACK and it is determined that there is no another node.

9 . The electronic apparatus according to claim 7 , wherein the processing circuit is configured to adjust, in a case that the HARQ feedback values of the reference data are NACK and it is determined that there is the another node, the CWS based on the number of times of maintaining the CWS at a predetermined CWS maximum.

10 . The electronic apparatus according to claim 9 ,

wherein the CWS is updated in a case that the number of times is less than or equal to a number of times threshold obtained based on a predetermined number of times of maintaining the CWS at the CWS maximum, and otherwise the CWS is maintained,

wherein in a case of maintaining the CWS at the CWS maximum for the predetermined number of times, the CWS is reset to be a predetermined CWS minimum.

11 . The electronic apparatus according to claim 10 ,

wherein the processing circuit is configured to select the predetermined number of times for each channel access priority, and

wherein the number of times threshold is obtained based on a square of the predetermined number of times.

12 . The electronic apparatus according to claim 5 , wherein, in the third scenario, the processing circuit is configured to determine that there is the another node and maintain the CWS in a case that the change rate is less than or equal to a predetermined change rate, and otherwise determine that there is no another node and update the CWS.

13 . The electronic apparatus according to claim 5 ,

wherein, in the third scenario, the processing circuit is configured to:

take, in a case that the first HARQ feedback values and the second HARQ feedback values are within a same channel occupation time, HARQ feedback values corresponding to a case where other code blocks are not transmitted together with the retransmitted code block when retransmitting the code block as the second HARQ feedback values, or

take, in a case that the first HARQ feedback values and the second HARQ feedback values are within a same channel occupation time, HARQ feedback values corresponding to a case where other code blocks are transmitted together with the retransmitted code block when retransmitting the code block as the second HARQ feedback values, or

take, in a case that the first HARQ feedback values and the second HARQ feedback values are not within a same channel occupation time, HARQ feedback values corresponding to a case where other code blocks are transmitted together with the retransmitted code block when retransmitting the code block as the second HARQ feedback values.

14 . The electronic apparatus according to claim 5 ,

wherein, in the second scenario, the information about the channel is received together with the HARQ feedback values or is received through the HARQ feedback values, and

wherein the information of the channel is an energy detection threshold.

15 . The electronic apparatus according to claim 14 ,

wherein the processing circuit is configured to determine that there is no another node and update the CWS in a case that the energy detection threshold is less than or equal to a predetermined energy detection threshold and the HARQ feedback values of the reference data are NACK, and

wherein the processing circuit is configured to determine that there is the another node and maintain the CWS in a case that the energy detection threshold is greater than the predetermined energy detection threshold and the HARQ feedback values of the reference data are NACK.

16 . A method for wireless communications by an electronic apparatus, the method comprising:

transmitting data;

acquiring hybrid automatic repeat request (HARQ) feedback values of the transmitted data; and

adjusting, based on the HARQ feedback values, a contention window size (CWS), and performing carrier sensing based on the CWS before a next data transmission, wherein the method further comprises:

adjusting the CWS based on a determination result based on the HARQ feedback values, and

determining whether there is another node based on HARQ feedback values of reference data and information about a channel between the electronic apparatus and a user equipment that is received from the user equipment,

wherein the reference data is transmitted within a first duration serving as a reference duration in a channel occupancy time (COT) among the transmitted data.