Method, user equipment and processing device for receiving downlink channel, and method for transmitting downlink channel

1. A method of receiving a downlink channel by a user equipment (UE) in a wireless communication system, the method comprising:

receiving, in a first reception time, a first physical downlink shared channel (PDSCH) associated with a first hybrid automatic repeat request (HARQ) process among a plurality of HARQ processes;

transmitting, in a first transmission time, a first HARQ-acknowledgement (HARQ-ACK) for the first PDSCH associated with the first HARQ process; and

receiving, in a second reception time, a second PDSCH for a same HARQ process identifier (ID) as the first HARQ process of the first PDSCH,

wherein the second PDSCH for the same HARQ process ID as the first HARQ process of the first PDSCH is a PDSCH scheduled by downlink control information (DCI), and

wherein receiving the second PDSCH for the same HARQ process ID as the first HARQ process of the first PDSCH comprises:

receiving the second PDSCH, for the same HARQ process ID as the first HARQ process of the first PDSCH, in the second reception time which is after the first transmission time, based on the first HARQ-ACK being not subject to HARQ deferral; and

receiving the second PDSCH, for the same HARQ process ID as the first HARQ process of the first PDSCH, in the second reception time which is after a second transmission time, based on the first HARQ-ACK being subject to the HARQ deferral and the first transmission time being determined by the HARQ deferral from the second transmission time earlier than the first transmission time.

2. The method of claim 1 , wherein based on the first HARQ-ACK being subject to the HARQ deferral and the first transmission time being determined by the HARQ deferral from the second transmission time, the second PDSCH for the same HARQ process ID as the first HARQ process of the first PDSCH is received in the second reception time which is after the second transmission time and before an end of the first transmission time.

3. The method of claim 2 , wherein the first PDSCH is a semi-persistent scheduling (SPS) based PDSCH.

4. The method of claim 3 , wherein the second PDSCH is for retransmission of a transport block included in the SPS based PDSCH.

5. The method of claim 2 , further comprising:

determining a third transmission time for a second HARQ-ACK for the second PDSCH for the same HARQ process ID as the first HARQ process of the first PDSCH; and

transmitting the second HARQ-ACK at the third transmission time.

6. A user equipment (UE) for receiving a downlink channel in a wireless communication system, the UE comprising:

at least one transceiver;

at least one processor; and

at least one computer memory operably connected to the at least one processor and configured to store instructions that, when executed, cause the at least one processor to perform operations comprising:

receiving, in a first reception time, a first physical downlink shared channel (PDSCH) associated with a first hybrid automatic repeat request (HARQ) process among a plurality of HARQ processes;

transmitting, in a first transmission time, a first HARQ-acknowledgement (HARQ-ACK) for the first PDSCH associated with the first HARQ process; and

receiving, in a second reception time, a second PDSCH for a same HARQ process identifier (ID) as the first HARQ process of the first PDSCH,

wherein the second PDSCH for the same HARQ process ID as the first HARQ process of the first PDSCH is a PDSCH scheduled by downlink control information (DCI), and

wherein receiving the second PDSCH for the same HARQ process ID as the first HARQ process of the first PDSCH comprises:

receiving the second PDSCH, for the same HARQ process ID as the first HARQ process of the first PDSCH, in the second reception time which is after the first transmission time, based on the first HARQ-ACK being not subject to HARQ deferral; and

receiving the second PDSCH, for the same HARQ process ID as the first HARQ process of the first PDSCH, in the second reception time which is after a second transmission time, based on the first HARQ-ACK being subject to the HARQ deferral and the first transmission time being determined by the HARQ deferral from the second transmission time earlier than the first transmission time.

7. A processing device configured to operate in a wireless communication system, the processing device comprising:

at least one processor; and

at least one computer memory operably connected to the at least one processor and configured to store instructions that, when executed, cause the at least one processor to perform operations comprising:

receiving, in a first reception time, a first physical downlink shared channel (PDSCH) associated with a first hybrid automatic repeat request (HARQ) process among a plurality of HARQ processes;

transmitting, in a first transmission time, a first HARQ-acknowledgement (HARQ-ACK) for the first PDSCH associated with the first HARQ process; and

receiving, in a second reception time, a second PDSCH for a same HARQ process identifier (ID) as the first HARQ process of the first PDSCH,

wherein the second PDSCH for the same HARQ process ID as the first HARQ process of the first PDSCH is a PDSCH scheduled by downlink control information (DCI), and

wherein receiving the second PDSCH for the same HARQ process ID as the first HARQ process of the first PDSCH comprises:

receiving the second PDSCH, for the same HARQ process ID as the first HARQ process of the first PDSCH, in the second reception time which is after the first transmission time, based on the first HARQ-ACK being not subject to HARQ deferral; and

receiving the second PDSCH, for the same HARQ process ID as the first HARQ process of the first PDSCH, in the second reception time which is after a second transmission time, based on the first HARQ-ACK being subject to the HARQ deferral and the first transmission time being determined by the HARQ deferral from the second transmission time earlier than the first transmission time.

8. A method of transmitting a downlink channel by a base station (BS) to a user equipment (UE) in a wireless communication system, the method comprising:

transmitting, in a first transmission time, a first physical downlink shared channel (PDSCH) associated with a first hybrid automatic repeat request (HARQ) process among a plurality of HARQ processes;

receiving, in a first reception time, a first HARQ-acknowledgement (HARQ-ACK) for the first PDSCH associated with the first HARQ process; and

transmitting, in a second transmission time, a second PDSCH for a same HARQ process identifier (ID) as the first HARQ process of the first PDSCH,

wherein the second PDSCH for the same HARQ process ID as the first HARQ process of the first PDSCH is a PDSCH scheduled by downlink control information (DCI), and

wherein transmitting the second PDSCH for the same HARQ process ID as the first HARQ process of the first PDSCH comprises:

transmitting the second PDSCH, for the same HARQ process ID as the first HARQ process of the first PDSCH, in the second transmission time which is after the first reception time, based on the first HARQ-ACK being not subject to HARQ deferral; and

transmitting the second PDSCH, for the same HARQ process ID as the first HARQ process of the first PDSCH, in the second transmission time which is after a second reception time, based on the first HARQ-ACK being subject to the HARQ deferral and the first reception time being determined by the HARQ deferral from the second reception time earlier than the first reception time.

9. The method of claim 8 , wherein based on the first HARQ-ACK being subject to the HARQ deferral and the first reception time being determined by the HARQ deferral from the second reception time, the second PDSCH for the same HARQ process ID as the first HARQ process of the first PDSCH is transmitted in the second transmission time which is after the second reception time and before an end of the first reception time.

10. The method of claim 9 , wherein the first PDSCH is a semi-persistent scheduling (SPS) based PDSCH.

11. The method of claim 10 , wherein the second PDSCH for the same HARQ process ID as the first HARQ process of the first PDSCH is for retransmission of a transport block included in the SPS based PDSCH.

12. The method of claim 9 , further comprising:

determining a third reception time for a second HARQ-ACK for the PDSCH for the same HARQ process ID as the first HARQ process of the first PDSCH; and

receiving the second HARQ-ACK at the third reception time.