Method, apparatus, and system for generating HARQ-ACK codebook in wireless communication system
One aspect of the present invention discloses a terminal of a wireless communication system. The terminal comprises a communication module and a processor for controlling the communication module, wherein the processor generates a hybrid automatic repeat request (HARQ)-ACK codebook including one or more bits indicating whether reception of a channel or signal is successful, and transmits the HARQ-ACK codebook to a base station of the wireless communication system, wherein the HARQ-ACK codebook is generated on the basis of a slot corresponding to a value of an HARQ-ACK feedback timing parameter (K1) set in a sub-slot level, and each of bits configuring the HARQ-ACK codebook corresponds to at least one sub-slot form among a plurality of sub-slots included in the slot.
1. A user equipment (UE) for use in a wireless communication system, the UE comprising:
a processor; and
a communication module,
wherein the processor is configured to:
receive downlink control information (DCI) for downlink scheduling via a physical downlink control channel (PDCCH), wherein the DCI includes a sub-slot offset k, and k is an element of a set K: {k 0 , k 1 , . . . , k m-1 }(m>0);
for each element k i (k i >0) of the set K, perform one of:
if a first downlink (DL) slot overlapping with UL sub-slot #(n u -k i ) does not overlap with UL sub-slot #(n u -k i-1 ), including hybrid automatic repeat request acknowledgement (HARQ-ACK) information for the first DL slot in a semi-static HARQ-ACK codebook, and
if the first DL slot overlaps with UL sub-slot #(n u -k i-1 ), skipping to include the HARQ-ACK information for the first DL slot in the semi-static HARQ-ACK codebook; and
transmit the semi-static HARQ-ACK codebook via a physical uplink control channel (PUCCH) in UL sub-slot #n u ,
wherein a generation of the HARQ-ACK information includes:
determining a set of valid physical downlink shared channel (PDSCH) candidates for the first DL slot, based on whether an end of a corresponding PDSCH candidate in the first DL slot is within any UL sub-slot #(n u -k o ), where k o is at least part of the set K.
2. The UE of claim 1 , wherein an DL slot includes 14 symbols, and an UL sub-slot includes X symbols, where X is less than 14.
3. The UE of claim 1 , wherein k o has a plurality of values corresponding UL sub-slots overlapping with the first DL slot.
4. The UE of claim 1 , wherein, if the UE does not have a capability to receive more than one PDSCH per DL slot, the HARQ-ACK information for the first DL slot includes HARQ-ACK information for one PDSCH reception only, when at least one valid PDSCH candidate is present in the first DL slot.
5. The UE of claim 1 , wherein, if the UE has a capability to receive more than one PDSCH per DL slot, the HARQ-ACK information for the first DL slot includes HARQ-ACK information for one or more PDSCH receptions, based on the set of valid PDSCH candidates.
6. The UE of claim 5 , wherein, if the UE has the capability to receive more than one PDSCH per DL slot, a same HARQ-ACK bit position is assigned to both (i) a first valid PDSCH candidate with a smallest last symbol index and (ii) zero or more second valid PDSCH candidates overlapped in time with the first valid PDSCH candidate, and then the first and the zero or more second valid PDSCH candidates are removed from the set of valid PDSCH candidates.
7. The UE of claim 1 , wherein if a plurality of DL slots are within UL sub-slot #(n u -k i ), the first DL slot corresponds to each of the plurality of DL slots, starting from a DL slot with smallest index of the plurality of DL slots.
8. The UE of claim 1 , wherein the end of the corresponding PDSCH candidate is determined based on a start and length indicator value (SLIV) for the first DL slot.
9. A method for use by a user equipment (UE) in a wireless communication system, the method comprising:
receiving downlink control information (DCI) for downlink scheduling via a physical downlink control channel (PDCCH), wherein the DCI includes a sub-slot offset k, and k is an element of a set K: {k 0 , k 1 , . . . , k m-1 }(m>0);
for each element k i (k i >0) of the set K, performing one of:
if a first downlink (DL) slot overlapping with UL sub-slot #(n u -k i ) does not overlap with UL sub-slot #(n u -k i-1 ), including hybrid automatic repeat request acknowledgement (HARQ-ACK) information for the first DL slot in a semi-static HARQ-ACK codebook, and
if the first DL slot overlaps with UL sub-slot #(n u -k i-1 ), skipping to include the HARQ-ACK information for the first DL slot in the semi-static HARQ-ACK codebook; and
transmitting the semi-static HARQ-ACK codebook via a physical uplink control channel PUCCH in UL sub-slot #n u ,
wherein a generation of the HARQ-ACK information includes:
determining a set of valid physical downlink shared channel (PDSCH) candidates for the first DL slot, based on whether an end of a corresponding PDSCH candidate in the first DL slot is within any UL sub-slot #(n u -k o ), where k o is at least part of the set K.
10. The method of claim 9 , wherein an DL slot includes 14 symbols, and an UL sub-slot includes X symbols, where X is less than 14.
11. The method of claim 9 , wherein k o has a plurality of values corresponding to UL sub-slots overlapping with the first DL slot.
12. The method of claim 9 , wherein, if the UE does not have a capability to receive more than one PDSCH per DL slot, the HARQ-ACK information for the first DL slot includes HARQ-ACK information for one PDSCH reception only, when at least one valid PDSCH candidate is present in the first DL slot.
13. The method of claim 9 , wherein, if the UE has a capability to receive more than one PDSCH per DL slot, the HARQ-ACK information for the first DL slot includes HARQ-ACK information for one or more PDSCH receptions, based on the set of valid PDSCH candidates.
14. The method of claim 13 , wherein, if the UE has the capability to receive more than one PDSCH per DL slot, a same HARQ-ACK bit position is assigned to both (i) a first valid PDSCH candidate with a smallest last symbol index and (ii) zero or more second valid PDSCH candidates overlapped in time with the first valid PDSCH candidate, and then the first and the zero or more second valid PDSCH candidates are removed from the set of valid PDSCH candidates.
15. The method of claim 9 , wherein if a plurality of DL slots are within UL sub-slot #(n u -k i ), the first DL slot corresponds to each of the plurality of DL slots, starting from a DL slot with smallest index of the plurality of DL slots.
16. The method of claim 9 , wherein the end of the corresponding PDSCH candidate is determined based on a start and length indicator value (SLIV) for the first DL slot.