1. A method of operation of a network node (14) in a cellular communications network (10) to provide Hybrid Automatic Repeat Request (HARQ) feedback for autonomous uplink transmissions in an unlicensed spectrum, comprising:', 'receiving a plurality of autonomous uplink transmissions from a wireless device (12) in the unlicensed spectrum; and', 'transmitting HARQ feedback for the plurality of autonomous uplink transmissions to the wireless device (12), the HARQ feedback comprising a bit map of some or all HARQ processes configured for at least one cell (16) and a corresponding bit acknowledgement mapped to each HARQ process.

2. The method of claim 1 wherein transmitting the HARQ feedback comprises transmitting the HARQ feedback via physical downlink control channel (PDCCH) or extended PDCCH (EPDCCH).

3. The method of claim 1 or 2, further comprising:', 'determining that the network node has failed to decode data of one or more autonomous uplink transmissions from the wireless device; and', 'in response to the determination, requesting retransmission of the data via downlink control information (DO).

4. The method of any of claims 1-3, further comprising:', 'receiving an indication of a remaining duration of a maximum channel occupancy time (MCOT) from the wireless device; and', 'in response to receiving the indication, transmitting information to the wireless device during the remaining duration.

5. The method of any of claims 1-4 wherein transmitting the HARQ feedback comprises transmitting the HARQ feedback using a format selected from a group consisting of:', 'a format based on physical downlink control channel (PDCCH) or extended PDCCH (EPDCCH);', 'a format comprising a physical layer channel using one interlace for multiple signals;

a format comprising a physical layer channel using one interlace for multiple signals in a downlink partial subframe;', 'a format based on Physical HARQ Indicator Channel (PHICH);', 'a format based on PHICH in combination with bit compression to reduce a size of the bitmap; and', 'a format based on an implicit ACK/NACK via Control Channel Element (CCE) indices of PDCCH transmissions sent to wireless devices for downlink scheduling where a time gap between an autonomous uplink transmission and a PDCCH transmission is 1 ms or more.

6. The method of any of claims 1-5 wherein, for each HARQ process of the some or all HARQ processes, the corresponding bit acknowledgement indicates a NACK if the network node (14) missed an autonomous uplink transmission from the wireless device (12) on the HARQ process, or the network node (14) failed to successfully decode an autonomous uplink transmission from the wireless device (12) on the HARQ process.

7. The method of any of claims 1-6, further comprising, if the network node (14) identifies an autonomous uplink transmission from the wireless device (12) and fails to successfully decode the identified autonomous uplink transmission, performing at least one of:', 'transmitting a request for retransmission using a dedicated uplink grant via PDCCH OR EPDCCH;', 'transmitting a NACK via common PDCCH (CPDCCH); and', 'transmitting a NACK via PHICH.

8. The method of any of claims 1-7, further comprising transmitting the HARQ feedback using a shared maximum channel occupancy time scheme in which a portion of a maximum channel occupancy time for an uplink transmission from the wireless device (12) is used for transmission by the network node.

9. The method of claim 8, further comprising transmitting the HARQ feedback starting at an earliest subframe boundary within the shared maximum

channel occupancy time after completion of the uplink transmission and performing a fast Listen Before Talk (LBT) procedure

10. The method of claim 8 wherein the shared maximum channel occupancy time scheme utilizes a shortened uplink transmission time interval (TTI) within a subframe to enable transmission of the HARQ feedback in a remainder of the subframe

11. The method of claim 8 wherein the shared maximum channel occupancy time scheme utilizes a timing advance for the uplink transmission such that a downlink channel in which the HARQ feedback is transmitted before a start of a next downlink subframe after completion of the uplink transmission

12. The method of any of claims 1-11 wherein transmitting the HARQ feedback comprises multiplexing the HARQ feedback with a planned downlink transmission

13. The method of any of claims 1-11 wherein transmitting the HARQ feedback comprises triggering a downlink transmission to transmit the HARQ feedback if a HARQ feedback has been pending for at least a predefined or preconfigured threshold amount of time

14. The method of any of claims 1-13 wherein the wireless device (12) is restricted from reusing a HARQ process before receiving HARQ feedback for the HARQ process from the network node (14)

15. A network node (14) for a cellular communications network (10) enabled to provide HARQ feedback for autonomous uplink transmissions in an unlicensed spectrum, comprising:', 'at least one processor (36), memory (38) and transceiver (42) collectively configured to:', 'receive a plurality of autonomous uplink transmissions from a wireless device (12) in the unlicensed spectrum; and

transmit HARQ feedback for the plurality of autonomous uplink transmissions to the wireless device (12), the HARQ feedback comprising a bit map of some or all HARQ processes configured for at least one cell (16) and a corresponding bit acknowledgement mapped to each HARQ process

16. The network node of claim 15 wherein transmitting the HARQ feedback comprises transmitting the HARQ feedback via physical downlink control channel (PDCCH) or extended PDCCH (EPDCCH)

17. The network node of claim 15 or 16, wherein the at least one processor (36), memory (38) and transceiver (42) further collectively configured to:', 'determine that the network node has failed to decode data of one or more autonomous uplink transmissions from the wireless device; and', 'in response to the determination, request retransmission of the data via downlink control information (DO)

18. The network node of any of claims 15-17, wherein the at least one processor (36), memory (38) and transceiver (42) further collectively configured to:', 'Receive an indication of a remaining duration of a maximum channel occupancy time (MCOT) from the wireless device; and', 'in response to receiving the indication, transmit information to the wireless device during the remaining duration

19. The network node of any of claims 15-18 wherein transmitting the HARQ feedback comprises transmitting the HARQ feedback using a format selected from a group consisting of:', 'a format based on physical downlink control channel (PDCCH) or extended PDCCH (EPDCCH);', 'a format comprising a physical layer channel using one interlace for multiple signals;', 'a format comprising a physical layer channel using one interlace for multiple signals in a downlink partial subframe;', 'a format based on Physical HARQ Indicator Channel (PHICH);

a format based on PHICH in combination with bit compression to reduce a size of the bitmap; and', 'a format based on an implicit ACK/NACK via Control Channel Element (CCE) indices of PDCCH transmissions sent to wireless devices for downlink scheduling where a time gap between an autonomous uplink transmission and a PDCCH transmission is 1 ms or more.

20. The network node of any of claims 15-19 wherein, for each HARQ process of the some or all HARQ processes, the corresponding bit acknowledgement indicates a NACK if the network node (14) missed an autonomous uplink transmission from the wireless device (12) on the HARQ process, or the network node (14) failed to successfully decode an autonomous uplink transmission from the wireless device (12) on the HARQ process.

21. The network node of any of claims 15-21, wherein the at least one processor (36), memory (38) and transceiver (42) further collectively configured to, if the network node (14) identifies an autonomous uplink transmission from the wireless device (12) and fails to successfully decode the identified autonomous uplink transmission, perform at least one of:', 'transmitting a request for retransmission using a dedicated uplink grant via PDCCH OR EPDCCH;', 'transmitting a NACK via common PDCCH (CPDCCH); and', 'transmitting a NACK via PHICH.

22. The network node of any of claims 15-21, wherein the at least one processor (36), memory (38) and transceiver (42) further collectively configured to transmit the HARQ feedback using a shared maximum channel occupancy time scheme in which a portion of a maximum channel occupancy time for an uplink transmission from the wireless device (12) is used for transmission by the network node.

23. The network node of claim 22, wherein the at least one processor (36), memory (38) and transceiver (42) further collectively configured to transmit the HARQ feedback starting at an earliest subframe boundary within the shared

maximum channel occupancy time after completion of the uplink transmission and performing a fast Listen Before Talk (LBT) procedure.

24. The network node of claim 22 wherein the shared maximum channel occupancy time scheme utilizes a shortened uplink transmission time interval (TTI) within a subframe to enable transmission of the HARQ feedback in a remainder of the subframe.

25. The network node of claim 22 wherein the shared maximum channel occupancy time scheme utilizes a timing advance for the uplink transmission such that a downlink channel in which the HARQ feedback is transmitted before a start of a next downlink subframe after completion of the uplink transmission.

26. The network node of any of claims 15-25 wherein transmitting the HARQ feedback comprises multiplexing the HARQ feedback with a planned downlink transmission.

27. The network node of any of claims 15-25 wherein transmitting the HARQ feedback comprises triggering a downlink transmission to transmit the HARQ feedback if a HARQ feedback has been pending for at least a predefined or preconfigured threshold amount of time.

28. The network node of any of claims 15-27 wherein the wireless device (12) is restricted from reusing a HARQ process before receiving HARQ feedback for the HARQ process from the network node (14).

29. A method of operation of a wireless device (12) in a cellular', 'communications network (10) enabled to transmit autonomous uplink transmissions in an unlicensed spectrum, comprising:', 'performing autonomous uplink transmissions in the unlicensed spectrum for one or more HARQ processes; and', 'receiving HARQ feedback from a network node (14), the HARQ feedback comprising a bit map of some or all HARQ processes configured for at least one

respective cell (16) and a corresponding bit acknowledgement mapped to each HARQ process.

30. The method of claim 29, further comprising:', 'in response to determining that no HARQ feedback for a predetermined autonomous uplink transmission is received from the network node within a predetermined time period, retransmitting the predetermined autonomous uplink transmission.

31. The method of claim 30, further comprising using a timer to determine a number of subframes since an initial transmission of the predetermined autonomous uplink transmission, and performing the retransmission in response to the timer exceeding a configured threshold.

32. The method of any of claims 29-31, further comprising:', 'determining a remaining duration of a maximum channel occupancy time', '(MCOT) of the wireless device;', 'transmitting an indication of a remaining duration of the MCOT to the network node; and', 'receiving information from the network node during the remaining duration.

33. The method of claim 29 wherein receiving the HARQ feedback comprises receiving the HARQ feedback via physical downlink control channel (PDCCH) or extended PDCCH (EPDCCH).

34. The method of claim 29 or 30, further comprising:', 'transmitting an autonomous uplink transmission to the network node; and receiving, from the network node via downlink control information (DO), a request for retransmission of the autonomous uplink transmission.

35. The method of any of claims 29-34 wherein, for each HARQ process of the some or all HARQ processes, the corresponding bit acknowledgement indicates a NACK if the network node (14) missed an autonomous uplink transmission from the wireless device (12) on the HARQ process, or the network node (14) failed to

successfully decode an autonomous uplink transmission from the wireless device (12) on the HARQ process.

36. The method of any of claims 29-35, further comprising receiving the HARQ feedback using a shared maximum channel occupancy time scheme in which a portion of a maximum channel occupancy time for an uplink transmission from the wireless device (12) is used for transmission by the network node.

37. The method of claim 36, further comprising receiving the HARQ feedback starting at an earliest subframe boundary within the shared maximum channel occupancy time after completion of the uplink transmission.

38. The method of claim 36 wherein the shared maximum channel occupancy time scheme utilizes a shortened uplink transmission time interval (TTI) within a subframe to enable transmission of the HARQ feedback in a remainder of the subframe.

39. The method of claim 36 wherein the shared maximum channel occupancy time scheme utilizes a timing advance for the uplink transmission such that a downlink channel in which the HARQ feedback is received before a start of a next downlink subframe after completion of the uplink transmission.

40. The method of any of claims 29-39 wherein transmitting the HARQ feedback comprises multiplexing the HARQ feedback with a planned downlink transmission.

41. A wireless device (12) for a cellular communications network (10) enabled to transmit autonomous uplink transmissions in an unlicensed spectrum, comprising:', 'at least one processor (20), memory (22) and transceiver (24) collectively configured to:', 'perform autonomous uplink transmissions in the unlicensed spectrum for one or more HARQ processes; and

receive HARQ feedback from a network node (14), the HARQ feedback comprising a bit map of some or all HARQ processes configured for at least one respective cell (16) and a corresponding bit acknowledgement mapped to each HARQ process.

42. The wireless device of claim 41, further comprising:', 'in response to determining that no HARQ feedback for a predetermined autonomous uplink transmission is received from the network node within a predetermined time period, retransmitting the predetermined autonomous uplink transmission.

43. The wireless device of claim 42, further comprising using a timer to determine a number of subframes since an initial transmission of the predetermined autonomous uplink transmission, and performing the retransmission in response to the timer exceeding a configured threshold.

44. The wireless device of any of claims 41-43, further comprising:', 'determining a remaining duration of a maximum channel occupancy time', '(MCOT) of the wireless device;', 'transmitting an indication of a remaining duration of the MCOT to the network node; and', 'receiving information from the network node during the remaining duration.

45. The wireless device of claim 41 wherein receiving the HARQ feedback comprises receiving the HARQ feedback via physical downlink control channel (PDCCH) or extended PDCCH (EPDCCH).

46. The wireless device of claim 41 or 42, further comprising:', 'transmitting an autonomous uplink transmission to the network node; and receiving, from the network node via downlink control information (DO), a request for retransmission of the autonomous uplink transmission.

47. The wireless device of any of claims 41-46 wherein receiving the HARQ feedback comprises transmitting the HARQ feedback using a format selected from a group consisting of:', 'a format based on physical downlink control channel (PDCCH) or extended PDCCH (EPDCCH);', 'a format comprising a physical layer channel using one interlace for multiple signals;', 'a format comprising a physical layer channel using one interlace for multiple signals in a downlink partial subframe;', 'a format based on Physical HARQ Indicator Channel (PHICH);', 'a format based on PHICH in combination with bit compression to reduce a size of the bitmap; and', 'a format based on an implicit ACK/NACK via Control Channel Element (CCE) indices of PDCCH transmissions sent to wireless devices for downlink scheduling where a time gap between an autonomous uplink transmission and a PDCCH transmission is 1 ms or more.

48. The wireless device of any of claims 41-47 wherein, for each HARQ process of the some or all HARQ processes, the corresponding bit acknowledgement indicates a NACK if the network node (14) missed an autonomous uplink transmission from the wireless device (12) on the HARQ process, or the network node (14) failed to successfully decode an autonomous uplink transmission from the wireless device (12) on the HARQ process.

49. The wireless device of any of claims 41-48, further comprising receiving the HARQ feedback using a shared maximum channel occupancy time scheme in which a portion of a maximum channel occupancy time for an uplink transmission from the wireless device (12) is used for transmission by the network node.

50. The wireless device of claim 49, further comprising receiving the HARQ feedback starting at an earliest subframe boundary within the shared maximum channel occupancy time after completion of the uplink transmission.

51. The wireless device of claim 49 wherein the shared maximum channel occupancy time scheme utilizes a shortened uplink transmission time interval (TTI) within a subframe to enable transmission of the HARQ feedback in a remainder of the subframe.

52. The wireless device of claim 49 wherein the shared maximum channel occupancy time scheme utilizes a timing advance for the uplink transmission such that a downlink channel in which the HARQ feedback is received before a start of a next downlink subframe after completion of the uplink transmission.

53. The wireless device of any of claims 41-52 wherein transmitting the HARQ feedback comprises multiplexing the HARQ feedback with a planned downlink transmission.']