Network node, a wireless communications device and methods therein for accessing an unlicensed radio frequency band

1. A method, performed by a wireless communications device for accessing a predefined system bandwidth within an unlicensed radio frequency band, the wireless communications device being configured, by a wireless communications network comprising a network node, to operate within the predefined system bandwidth which comprises a plurality of bandwidth parts configured by the wireless communications network, the method comprising:

receiving, from the network node, downlink control information (DCI) including an explicit indication requesting the wireless communications device to make a prioritization among the plurality of bandwidth parts;

prioritizing, in response to receiving the indication, among the plurality of bandwidth parts without prioritization information from the network node;

selecting at least one bandwidth part of the plurality of bandwidth parts in accordance with the prioritization; and

accessing the at least one bandwidth part selected.

2. The method according to claim 1 , wherein the accessing the unlicensed radio frequency band comprises accessing the unlicensed frequency within a bandwidth less than the system bandwidth.

3. The method according to claim 1 , wherein the accessing the unlicensed radio frequency band comprises accessing the unlicensed frequency within one or more bandwidth parts.

4. The method according to claim 1 , wherein the accessing the unlicensed radio frequency band comprises accessing the unlicensed frequency within a single bandwidth part.

5. The method according to claim 1 , wherein the accessing the unlicensed radio frequency band comprises performing channel sensing and/or transmitting data and/or receiving data on at least one of the plurality of bandwidth parts.

6. The method according to claim 1 , wherein the prioritizing among the plurality of bandwidth parts is based on any one or more of:

a result of channel sensing and/or transmission performance and/or reception performance among the plurality of bandwidth parts;

a measure of channel occupancy among the plurality of bandwidth parts; and

a hopping sequence among the plurality of bandwidth parts.

7. The method according to claim 1 , wherein the prioritizing among the plurality of bandwidth parts comprises prioritizing frequency bands for which the results of channel sensing and/or transmission performance and/or reception performance have a success rate at or over a threshold success rate.

8. The method according to claim 1 , wherein the prioritizing among the plurality of bandwidth parts comprises prioritizing frequency bands for which the channel occupancy is below a threshold channel occupancy.

9. The method according to claim 1 , wherein the prioritizing among the plurality of bandwidth parts comprises prioritizing a first bandwidth part over a second bandwidth part, wherein a first measure of channel occupancy of the first bandwidth part is lower than a second measure of channel occupancy of the second bandwidth part.

10. The method according to claim 1 , wherein the prioritizing among the plurality of bandwidth parts comprises prioritizing the first bandwidth part over the second bandwidth part, wherein a first success rate of channel sensing and/or transmission performance and/or reception performance of the first bandwidth part is higher than a second success rate of channel sensing and/or transmission performance and/or reception performance of the second bandwidth part.

11. The method according to claim 1 , wherein the received indication requesting the wireless communications device to make the prioritization is valid for two or more consecutive accesses.

12. The method according to claim 1 , further comprising:

determining that an amount of data to transmit from the wireless communications device is below a predetermined threshold amount of data, and in response to receiving the indication enabling the wireless communications device to make the prioritization and in response to determining that the amount of data to transmit from the wireless communications device is below a predetermined threshold amount of data;

prioritizing among the plurality of bandwidth parts.

13. The method according to claim 1 , wherein the prioritizing among the plurality of bandwidth parts is based on a parameter respectively associated with the plurality of bandwidth parts determined by the wireless communications device.

14. A wireless communications device configured to operate in an unlicensed radio frequency band used by a wireless communications network, and further configured to access the unlicensed radio frequency band by being configured to:

receive from a network node comprised in the wireless communications network, downlink control information (DCI) including an explicit indication requesting the wireless communications device to make a prioritization among a plurality of bandwidth parts comprised in the unlicensed radio frequency band;

prioritize, in response to receiving the indication, among the plurality of bandwidth parts according to a selected prioritization algorithm determined by the wireless communications device;

select at least one bandwidth part of the plurality of bandwidth parts in accordance with the prioritization; and

access the at least one bandwidth part selected.

15. The wireless communications device according to claim 14 , wherein the wireless communications device is configured to access the unlicensed radio frequency band by performing channel sensing and/or transmitting data and/or receiving data on at least one of the plurality of bandwidth parts.

16. The wireless communications device according to claim 14 , wherein the wireless communications device is configured to prioritize among the plurality of bandwidth parts based on any one or more of:

a result of channel sensing and/or transmission performance and/or reception performance among the plurality of bandwidth parts;

a measure of channel occupancy among the plurality of bandwidth parts; and

a hopping sequence among the plurality of bandwidth parts.

17. The wireless communications device according to claim 14 , wherein the wireless communications device is configured to prioritize among the plurality of bandwidth parts based on a parameter associated with the plurality of bandwidth parts determined by the wireless communications device.

18. A method, performed by a network node configured to operate in an unlicensed radio frequency band used by a wireless communications network, for controlling access to the unlicensed radio frequency band, the method comprising:

transmitting, to a wireless communications device configured to operate in the wireless communications network, downlink control information (DCI) including an explicit request for the wireless communications device to make a prioritization among a plurality of bandwidth parts comprised in the unlicensed radio frequency band without further prioritization information,

wherein the network node configures the wireless communications device to prioritize, in response to receiving the request, among the plurality of bandwidth parts, select at least one bandwidth part among the plurality of bandwidth parts in accordance with the prioritization, and to access the at least one bandwidth part selected.

19. The method according claim 18 , wherein controlling the access to the unlicensed radio frequency band further comprises

transmitting to the wireless communications device a second indication indicating that the prioritization among the plurality of bandwidth parts is to be based on any one or more of:

a result of channel sensing and/or transmission performance and/or reception performance among the plurality of bandwidth parts;

a measure of channel occupancy among the plurality of bandwidth parts; and

a hopping sequence among the plurality of bandwidth parts.