Method and apparatus for performing downlink reception based on DRX retransmission timer in wireless communication system

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

• at least one transceiver;
• at least one processor;
• and
• at least one computer memory operably connectable to the at least one processor and storing instructions that, when executed, cause the at least one processor to perform operations comprising:
• receiving, from a network, resource allocation information;
• performing a downlink (DL) reception based on the resource allocation information;
• demapping one or more received layers to a block of complexed-valued modulation symbols;
• descrambling and demodulating the block of complexed-valued modulation symbols to obtain a codeword;
• decoding the codeword to obtain a data block based on a coding scheme;
• and
• processing the data block,
• wherein processing the data block comprises:
• configuring not to transmit a Hybrid Automatic Repeat Request (HARQ) feedback for a DL HARQ process;
• upon a first Physical Downlink Control Channel (PDCCH) for the DL HARQ process is detected, starting a timer for monitoring subsequent PDCCHs related to retransmission of the DL HARQ process, without transmitting the HARQ feedback;
• monitoring the subsequent PDCCHs related to retransmission of the DL HARQ process while the timer is running;
• restarting the timer for the DL HARQ process without transmitting the HARQ feedback, based on decoding of DL data related to the first PDCCH failing and a second PDCCH for the DL HARQ process being detected;
• and
• based on decoding of DL data related to the second PDCCH succeeding, stopping the timer for the DL HARQ process, and skipping monitoring of the subsequent PDCCHs for the DL HARQ process.

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

• at least one processor;
• and
• at least one computer memory operably connectable to the at least one processor and storing instructions that, when executed, cause the at least one processor to perform operations comprising:
• receiving, from a network, resource allocation information;
• performing a downlink (DL) reception based on the resource allocation information;
• demapping one or more received layers to a block of complexed-valued modulation symbols;
• descrambling and demodulating the block of complexed-valued modulation symbols to obtain a codeword;
• decoding the codeword to obtain a data block based on a coding scheme;
• and
• processing the data block,
• wherein processing the data block comprises:
• configuring not to transmit a Hybrid Automatic Repeat Request (HARQ) feedback for a DL HARQ process;
• upon a first Physical Downlink Control Channel (PDCCH) for the DL HARQ process is detected, starting a timer for monitoring subsequent PDCCHs related to retransmission of the DL HARQ process, without transmitting the HARQ feedback;
• monitoring the subsequent PDCCHs related to retransmission of the DL HARQ process while the timer is running;
• restarting the timer for the DL HARQ process without transmitting the HARQ feedback, based on decoding of DL data related to the first PDCCH failing and a second PDCCH for the DL HARQ process being detected;
• and
• based on decoding of DL data related to the second PDCCH succeeding, stopping the timer for the DL HARQ process, and skipping monitoring of the subsequent PDCCHs for the DL HARQ process.

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

• receiving, from a network, resource allocation information;
• performing a downlink (DL) reception based on the resource allocation information;
• demapping one or more received layers to a block of complexed-valued modulation symbols;
• descrambling and demodulating the block of complexed-valued modulation symbols to obtain a codeword;
• decoding the codeword to obtain a data block based on a coding scheme;
• and
• processing the data block,
• wherein processing the data block comprises:
• configuring not to transmit a Hybrid Automatic Repeat Request (HARQ) feedback for a DL HARQ process;
• upon a first Physical Downlink Control Channel (PDCCH) for the DL HARQ process is detected, starting a timer for monitoring subsequent PDCCHs related to retransmission of the DL HARQ process, without transmitting the HARQ feedback;
• monitoring the subsequent PDCCHs related to retransmission of the DL HARQ process while the timer is running;
• restarting the timer for the DL HARQ process without transmitting the HARQ feedback, based on decoding of DL data related to the first PDCCH failing and a second PDCCH for the DL HARQ process being detected;
• and
• based on decoding of DL data related to the second PDCCH succeeding, stopping the timer for the DL HARQ process, and skipping monitoring of the subsequent PDCCHs for the DL HARQ process.