Method and apparatus for transmitting one-shot HARQ feedback by user equipment in wireless communication system

A user equipment (UE) in a wireless communication system, the UE comprising:

• at least one processor;
• and
• at least one computer memory storing instructions that, when executed by the at least one processor, cause the UE to perform operations comprising:
• receiving a One-shot Hybrid Automatic Repeat and request (HARQ)-acknowledgement (ACK) request message from a network;
• transmitting a One-shot HARQ-ACK related to a plurality of HARQ processes to the network,
• wherein, based on at least one Round-Trip Time (RTT) timer and at least one retransmission timer for at least one HARQ process among the plurality of HARQ processes not being running, the at least one RTT timer for the at least one HARQ process is started upon transmitting the One-shot HARQ-ACK;
• starting the at least one retransmission timer based on the at least one RTT timer being expired;
• and
• monitoring at least one Physical Downlink Control Channel (PDCCH) for the at least one HARQ process during the at least one retransmission timer is running.

An apparatus for a user equipment (UE), the apparatus comprising:

• at least one processor;
• and
• at least one computer memory storing instructions that, when executed by the at least one processor, cause the UE to perform operations comprising:
• receiving a One-shot Hybrid Automatic Repeat and request (HARQ)-acknowledgement (ACK) request message from a network;
• transmitting a One-shot HARQ-ACK related to a plurality of HARQ processes to the network,
• wherein, based on at least one Round-Trip Time (RTT) timer and at least one retransmission timer for at least one HARQ process among the plurality of HARQ processes not being running, the at least one RTT timer for the at least one HARQ process is started upon transmitting the One-shot HARQ-ACK;
• starting the at least one retransmission timer based on the at least one RTT timer being expired;
• and
• monitoring at least one Physical Downlink Control Channel (PDCCH) for the at least one HARQ process during the at least one retransmission timer is running.

A non-transitory computer readable storage medium comprising program instructions that, when executed by at least one processor, cause a user equipment (UE) to perform operations comprising:

• receiving a One-shot Hybrid Automatic Repeat and request (HARQ)-acknowledgement (ACK) request message from a network;
• transmitting a One-shot HARQ-ACK related to a plurality of HARQ processes to the network,
• wherein, based on at least one Round-Trip Time (RTT) timer and at least one retransmission timer for at least one HARQ process among the plurality of HARQ processes not being running, the at least one RTT timer for the at least one HARQ process is started upon transmitting the One-shot HARQ-ACK;
• starting the at least one retransmission timer based on the at least one RTT timer being expired;
• and
• monitoring at least one Physical Downlink Control Channel (PDCCH) for the at least one HARQ process during the at least one retransmission timer is running.