Method for transmitting signal on basis of HARQ by using PC polar code in wireless communication system, and apparatus therefor

A first wireless device transmitting a signal based on Hybrid Automatic Repeat reQuest (HARQ) using a parity check (PC) polar code in a wireless communication system, the first wireless device comprising:

• one or more transceivers;
• one or more processors controlling the one or more transceivers;
• and
• one or more memories operably connected to the one or more processors, and storing instructions that configure the one or more processors to perform operations when being executed by the one or more processors,
• wherein the operations includes:
• generating a first codeword based on a first PC polar code, wherein the first codeword is generated based on one or more first bit channel indices among bit channel indices of the first PC polar code;
• transmitting the first codeword;
• generating a second codeword based on a second PC polar code, wherein the second codeword is generated based on one or more second bit channel indices among bit channel indices of the second PC polar code;
• and
• transmitting the second codeword,
• wherein the transmission of the second codeword is related to retransmission of the first codeword,
• wherein the one or more first bit channel indices are allocated to a data block and at least one first parity check (PC) bit,
• wherein the one or more second bit channel indices are allocated to the data block and at least one second parity check (PC) bit,
• wherein the at least one second PC bit includes the at least one first PC bit,
• wherein the one or more second bit channel indices are based on specific bit channel indices determined based on an order of a reliability related to the second PC polar code, and
• wherein, based on the specific bit channel indices including at least one third bit channel index belonging to a lower polar subcode of the second PC polar code:
• 1) The one or more second bit channel indices include at least one fourth bit channel index,
• 2) the at least one fourth bit channel index is determined in a range excluding the specific bit channel indices among bit channel indices belonging to an upper polar subcode of the second PC polar code,
• 3) The at least one fourth bit channel index is allocated to a specific bit value related to the at least one third bit channel index,
• 4) The specific bit value is related to at least one of i) the at least one second PC bit or ii) the data block, and
• 5) A bit value of the third bit channel index related to the at least one second PC bit among the at least one third bit channel index is configured as 0.

One or more non-transitory computer-readable medium storing one or more instructions,

• wherein the one or more instructions configure the one or more processors to perform operations when being executed by the one or more processors,
• wherein the operations includes:
• generating a first codeword based on a first parity check (PC) polar code, wherein the first codeword is generated based on one or more first bit channel indices among bit channel indices of the first PC polar code;
• transmitting the first codeword;
• generating a second codeword based on a second parity check (PC) polar code, wherein the second codeword is generated based on one or more second bit channel indices among bit channel indices of the second PC polar code;
• and
• transmitting the second codeword,
• wherein the transmission of the second codeword is related to retransmission of the first codeword,
• wherein the one or more first bit channel indices are allocated to a data block and at least one first parity check (PC) bit,
• wherein the one or more second bit channel indices are allocated to the data block and at least one second parity check (PC) bit,
• wherein the at least one second PC bit includes the at least one first PC bit,
• wherein the one or more second bit channel indices are based on specific bit channel indices determined based on an order of a reliability related to the second PC polar code, and
• wherein, based on the specific bit channel indices including at least one third bit channel index belonging to a lower polar subcode of the second PC polar code:
• 1) The one or more second bit channel indices include at least one fourth bit channel index,
• 2) the at least one fourth bit channel index is determined in a range excluding the specific bit channel indices among bit channel indices belonging to an upper polar subcode of the second PC polar code,
• 3) The at least one fourth bit channel index is allocated to a specific bit value related to the at least one third bit channel index,
• 4) the specific bit value is related to at least one of i) the at least one second PC bit or ii) the data block, and
• 5) A bit value of the third bit channel index related to the at least one second PC bit among the at least one third bit channel index is configured as 0.