HARQ-ACK feedback for configured grant PUSCH
Methods, a remote unit and abase unit are disclosed. According to one embodiment, a remote unit comprising a transceiver; a memory; and a processor coupled to the transceiver and the memory and configured to: control the transceiver to transmit, to a base unit, an indicator in an uplink control information (UCI), wherein the UCI is associated to a configured grant uplink data channel, and the indicator requests code block group (CBG)-level hybrid automatic repeat request acknowledgement (HARQ-ACK) feedback for the configured grant uplink data channel, and control the transceiver to receive, from the base unit, first downlink control information (DCI) which includes a HARQ-ACK codebook, wherein the first DCI has the same size as one uplink grant scheduling uplink data transmission, and wherein the HARQ-ACK codebook includes CBG-level HARQ-ACK feedback information bits for the configured grant uplink data channel.
1. A user equipment (UE), comprising:
at least one memory; and
at least one processor coupled with the at least one memory and configured to cause the UE to:
transmit, to a base station, an indicator in an uplink control information (UCI), wherein the UCI is associated with a configured grant uplink data channel, and the indicator requests code block group (CBG)-level hybrid automatic repeat request acknowledgement (HARQ-ACK) feedback for the configured grant uplink data channel;
determine a maximum number of uplink HARQ processes which can be acknowledged with CBG-level HARQ-ACK feedback based on a size of an uplink grant scheduling uplink data transmission; and
receive, from the base station, first downlink control information (DCI) which includes a HARQ-ACK codebook, wherein the first DCI has the same size as the uplink grant, and the HARQ-ACK codebook includes CBG-level HARQ-ACK feedback information bits for the configured grant uplink data channel.
2. The UE of claim 1 , wherein the at least one processor is configured to cause the UE to receive a radio resource control (RRC) signaling from the base station indicating a maximum number of uplink HARQ processes which can be acknowledged with CBG-level HARQ-ACK feedback in the first DCI.
3. The UE of claim 2 , wherein the HARQ-ACK codebook comprises two parts: a first part which includes TB-level HARQ-ACK information bits for N uplink HARQ processes; and a second part which includes the CBG-level HARQ-ACK information bits for X uplink HARQ processes, wherein N is a total number of uplink HARQ processes, and X is the maximum number of uplink HARQ processes with CBG-level HARQ-ACK feedback.
4. The UE claim 2 , wherein the HARQ-ACK codebook comprises two parts: a first part which includes TB-level HARQ-ACK information bits for N-X uplink HARQ processes; and a second part which includes the CBG-level HARQ-ACK information bits for X uplink HARQ processes, wherein N is a total number of uplink HARQ processes, and X is the maximum number of uplink HARQ processes with CBG-level HARQ-ACK feedback.
5. The UE of claim 2 , wherein the HARQ-ACK codebook comprises TB-level HARQ-ACK information bits for N-X uplink HARQ processes and the CBG-level HARQ-ACK information bits for X uplink HARQ processes, wherein N is a total number of uplink HARQ processes, X is the maximum number of uplink HARQ processes with CBG-level HARQ-ACK feedback, and the TB-level HARQ-ACK information bits and the CBG-level HARQ-ACK information bits are concatenated in an order of uplink HARQ process IDs.
6. The UE of claim 2 , wherein the HARQ-ACK codebook comprises CBG-level HARQ-ACK information bits for X uplink HARQ processes, and X is the maximum number of uplink HARQ processes with CBG-level HARQ-ACK feedback.
7. The UE of claim 2 , wherein the uplink HARQ processes with CBG-level HARQ-ACK feedback are used for configured grant uplink transmissions.
8. The UE of claim 2 , wherein the at least one processor is configured to cause the UE to select up to X uplink HARQ processes with CBG-level HARQ-ACK feedback from all uplink HARQ processes and set the indicator in the UCI corresponding to each of up to X uplink HARQ processes, and X is the maximum number of uplink HARQ processes which can be acknowledged with CBG-level HARQ-ACK feedback in the first DCI.
9. The UE of claim 8 , wherein the UE is configured with a plurality of criteria used for selecting up to X uplink HARQ processes with CBG-level HARQ-ACK feedback.
10. The UE of claim 1 , wherein the maximum number of uplink HARQ processes with CBG-level HARQ-ACK feedback is determined as the largest x satisfying a condition, N+x*M+Z<=Y, and, M is maximum number of CBGs per transport block (TB) configured by RRC signaling, N is a total number of uplink HARQ processes, Z is a number of other necessary information bits in the first DCI except for the HARQ-ACK codebook, and Y is the size of the uplink grant.
11. The UE of claim 1 , wherein the maximum number of uplink HARQ processes with CBG-level HARQ-ACK feedback is determined as the largest x satisfying a condition, x*M+(N−x)+Z<=Y, and, M is maximum number of CBGs per TB configured by RRC signaling, N is a total number of uplink HARQ processes, Z is a number of other necessary information bits in the first DCI except for the HARQ-ACK codebook, and Y is the size of the uplink grant.
12. The UE of claim 1 , wherein the maximum number of uplink HARQ processes with CBG-level HARQ-ACK feedback is determined as the largest x satisfying a condition, x*M+Z<=Y, and, x<=N, N is a total number of uplink HARQ processes, M is maximum number of CBGs per TB configured by RRC signaling, Z is a number of other necessary information bits in the first DCI except for the HARQ-ACK codebook, and Y is the size of the uplink grant.
13. The UE of claim 1 , wherein the UCI includes a field indicating HARQ process number for the configured grant uplink data channel and the indicator in the UCI requests CBG-level HARQ-ACK feedback for the HARQ process number.
14. The UE of claim 1 , wherein the at least one processor is configured to cause the UE to receive, from the base station, second downlink control information (DCI) which includes TB-level HARQ-ACK feedback for all uplink HARQ processes, and the second DCI has the same size as the uplink grant.
15. The UE of claim 14 , wherein a field for differentiating the first DCI and the second DCI is included in the first DCI and the second DCI.
16. The UE of claim 14 , wherein the first DCI includes only CBG-level HARQ-ACK feedback for uplink data transmissions.
17. The UE of claim 1 , wherein the UCI further includes code block group transmission information (CBGTI) indicating CBGs transmitted on the configured grant uplink data channel.
18. A base station, comprising:
at least one memory; and
at least one processor coupled with the at least one memory and configured to cause the base station to:
receive, from a user equipment (UE), an indicator in an uplink control information (UCI), wherein the UCI is associated to a configured grant uplink data channel, and the indicator requests code block group (CBG)-level hybrid automatic repeat request acknowledgement (HARQ-ACK) feedback for the configured grant uplink data channel;
determine a maximum number of uplink HARQ processes which can be acknowledged with CBG-level HARQ-ACK feedback based on a size of an uplink grant scheduling uplink data transmission; and
transmit, to the UE, first downlink control information (DCI) which includes a HARQ-ACK codebook, wherein the first DCI has the same size as the uplink grant, and the HARQ-ACK codebook includes CBG-level HARQ-ACK feedback information bits for the configured grant uplink data channel.
19. A method performed by a user equipment (UE), the method comprising:
transmitting, to a base station, an indicator in an uplink control information (UCI), wherein the UCI is associated with a configured grant uplink data channel, and the indicator requests code block group (CBG)-level hybrid automatic repeat request acknowledgement (HARQ-ACK) feedback for the configured grant uplink data channel;
determining a maximum number of uplink HARQ processes which can be acknowledged with CBG-level HARQ-ACK feedback based on a size of an uplink grant scheduling uplink data transmission; and
receiving, from the base station, first downlink control information (DCI) which includes a HARQ-ACK codebook, wherein the first DCI has the same size as the uplink grant, and the HARQ-ACK codebook includes CBG-level HARQ-ACK feedback information bits for the configured grant uplink data channel.
20. A method performed by a base station, comprising:
receiving, from a user equipment (UE), an indicator in an uplink control information (UCI), wherein the UCI is associated with a configured grant uplink data channel, and the indicator requests code block group (CBG)-level hybrid automatic repeat request acknowledgement (HARQ-ACK) feedback for the configured grant uplink data channel;
determining a maximum number of uplink HARQ processes which can be acknowledged with CBG-level HARQ-ACK feedback based on a size of an uplink grant scheduling uplink data transmission; and
transmitting, to the UE, first downlink control information (DCI) which includes a HARQ-ACK codebook, wherein the first DCI has the same size as the uplink grant, and the HARQ-ACK codebook includes CBG-level HARQ-ACK feedback information bits for the configured grant uplink data channel.