HARQ feedback for grant-free transmission
Systems, apparatuses, and methods are described for wireless communications. A base station may transmit wireless device-specific downlink control information comprising HARQ feedback to a wireless device. Coordinating a plurality of HARQ feedbacks may result in complicated processing at the base station and/or a delay to schedule a HARQ feedback for the wireless device. The transmission of the downlink control information may not require HARQ feedback from a wireless device. By reducing the transmission of HARQ feedback, the channel capacity utilized for error correction transmissions can be reduced, thereby enhancing resource utilization.
1. A method comprising:
receiving, by a base station from one or more wireless devices via first radio resources indicated by one or more first configured uplink grants, one or more first transport blocks;
determining, based on a quantity of the one or more first transport blocks, a size of downlink control information (DCI);
transmitting, to a wireless device of the one or more wireless devices, a control message comprising an indication of the determined size of the DCI;
receiving, from the wireless device via one or more second radio resources indicated by a second configured uplink grant, one or more second transport blocks; and
transmitting, to the wireless device, DCI having the determined size, wherein the DCI comprises at least one field indicating an acknowledgement associated with the one or more second transport blocks.
2. The method of claim 1 , wherein the control message comprises one or more radio resource control messages indicating an identifier of the DCI.
3. The method of claim 2 , further comprising determining, based on an index of the wireless device, a position of the at least one field indicating the acknowledgement, wherein the one or more radio resource control messages comprise the index.
4. The method of claim 2 , wherein the one or more radio resource control messages comprise:
a periodicity of the second configured uplink grant; and
an offset of a resource of the one or more second radio resources, wherein the offset is with respect to a first system frame number.
5. The method of claim 1 , wherein the at least one field indicating the acknowledgement comprises a hybrid automatic repeat request (HARQ) process number associated with the one or more second transport blocks.
6. The method of claim 1 , further comprising:
generating, based on the determined size of the DCI being insufficient to indicate an acknowledgement of a portion of the one or more second transport blocks, second DCI comprising at least one field indicating an acknowledgement associated with the portion of the one or more second transport blocks; and
transmitting, by the base station to the wireless device, the second DCI.
7. The method of claim 1 , further comprising:
based on the receiving the one or more second transport blocks, starting a timer, wherein transmitting the DCI occurs before an expiration of the timer.
8. A method comprising:
receiving, by a base station from a plurality of wireless devices via first radio resources indicated by one or more first configured uplink grants, one or more first transport blocks;
determining, based on a quantity of the one or more first transport blocks, a size of group common downlink control information (DCI);
transmitting, to the plurality of wireless devices, a control message comprising an indication of the determined size of the group common DCI;
receiving, from the plurality of wireless devices via one or more second radio resources indicated by a second configured uplink grant, one or more second transport blocks; and
transmitting, to the plurality of wireless devices, group common DCI having the determined size, wherein the group common DCI comprises at least one field indicating hybrid automatic repeat request (HARQ) feedback associated with the one or more second transport blocks.
9. The method of claim 8 , wherein the control message comprises one or more radio resource control messages comprising an identifier of the group common DCI.
10. The method of claim 9 , further comprising determining, based on an index of a wireless device of the plurality of wireless devices, a position of the at least one field indicating HARQ feedback in the group common DCI.
11. The method of claim 10 , wherein the one or more radio resource control messages comprise the index.
12. The method of claim 9 , wherein the one or more radio resource control messages comprise:
a periodicity of the second configured uplink grant; and
an offset, with respect to a first system frame number, of a resource of the one or more second radio resources.
13. The method of claim 8 , further comprising:
generating, based on the determined size of the group common DCI being insufficient to indicate the HARQ feedback of a portion of the one or more second transport blocks, second group common DCI comprising at least one field indicating HARQ feedback associated with the portion of the one or more second transport blocks; and
transmitting, to a wireless device of the plurality of wireless devices, the second group common DCI.
14. The method of claim 8 , further comprising:
based on receiving the one or more second transport blocks, starting a timer, wherein transmitting the group common DCI occurs before an expiration of the timer.
15. A method comprising:
transmitting, by a wireless device to a base station via first radio resources indicated by one or more first configured uplink grants, one or more first transport blocks;
receiving, from the base station, a control message comprising an indication of a size of downlink control information (DCI);
transmitting, to the base station via one or more second radio resources indicated by a second configured uplink grant, one or more second transport blocks; and
receiving, from the base station, DCI having the size indicated by the control message, wherein the DCI comprises:
an identifier indicating the wireless device; and
a field indicating an acknowledgement associated with the one or more second transport blocks.
16. The method of claim 15 , wherein the control message comprises one or more radio resource control messages indicating an identifier of the DCI.
17. The method of claim 16 , wherein the one or more radio resource control messages comprise at least one of:
a periodicity of the second configured uplink grant; or
an offset of a resource of the one or more second radio resources, wherein the offset is with respect to a first system frame number.
18. The method of claim 15 , further comprising:
monitoring a control channel for the DCI having the size indicated by the control message.
19. The method of claim 15 , further comprising:
starting, based on the transmitting of the one or more second transport blocks, a timer.
20. The method of claim 15 , wherein the field indicating the acknowledgement further indicates a hybrid automatic repeat request (HARQ) process number.
21. A method comprising:
transmitting, by a wireless device to a base station via first radio resources indicated by one or more first configured uplink grants, one or more first transport blocks;
receiving, from the base station, a control message comprising an indication of a size of group common downlink control information (DCI);
transmitting, to the base station via one or more second radio resources indicated by a second configured uplink grant, one or more second transport blocks; and
receiving, from the base station, group common DCI having the size indicated by the control message, wherein the group common DCI comprises:
an identifier indicating the wireless device; and
a field indicating hybrid automatic repeat request (HARQ) feedback.
22. The method of claim 21 , further comprising:
receiving one or more radio resource control messages comprising an identifier of the group common DCI.
23. The method of claim 22 , wherein the one or more radio resource control messages further comprise at least one of:
an index of the wireless device;
a periodicity of the second configured uplink grant; or
an offset, with respect to a first system frame number, of a resource of the one or more second radio resources.
24. The method of claim 21 , further comprising:
monitoring a control channel for the group common DCI having the size indicated by the control message.
25. The method of claim 21 , further comprising:
starting, based on the transmitting of the one or more second transport blocks, a timer.
26. The method of claim 21 , wherein the field indicating the HARQ feedback comprises a HARQ process number.