Method of transmitting and receiving transmission block based on code block group
Disclosed is a method of transmitting and receiving a transmission block based on a code block group (CBG) in a 3GPP NR system. A method of a terminal may be provided for receiving a transmission block from a base station. The method may include receiving a transmission block composed of one or more code block groups (CBGs) from the base station, transmitting a HARQ ACK/NACK message for the transmission block to the base station, receiving a retransmission block configured based on the HARQ ACK/NACK message for the transmission block, and transmitting a HARQ ACK/NACK message for the retransmission block to the base station.
1. A method for receiving, by a terminal, a transmission block from a base station, the method comprising:
receiving a transmission block composed of one or more code block groups from the base station;
transmitting a hybrid automatic repeat request (HARQ) acknowledgement/negative-acknowledgement (ACK/NACK) message for the transmission block to the base station;
receiving a retransmission block configured based on the HARQ ACK/NACK message for the transmission block from the base station; and
transmitting a HARQ ACK/NACK message for the retransmission block to the base station,
wherein when a total number of code blocks forming the transmission block is equal to C and a total number of code block groups forming the transmission block is equal to G, among the G code block groups, (C mod G) code block groups are composed of ┌C/G┐ code blocks, and the other (G−(C mod G)) code block groups are composed of └C/G┘ code blocks, where C and G are natural numbers.
2. The method of claim 1 ,
wherein each of a number of bits of the HARQ ACK/NACK message for the transmission block and a number of bits of the HARQ ACK/NACK message for the retransmission block is set to a fixed value N, and
wherein the value N is received from the base station through high layer signaling.
3. The method of claim 2 , wherein a number K of code block groups forming the transmission block or the retransmission block is less than or equal to the value N, where K and N are nature numbers.
4. The method of claim 3 , wherein when the value K is less than the value N, last (N−K) bits of the HARQ ACK/NACK message for the transmission block or the HARQ ACK/NACK message for the retransmission block are set to either NACK bits or ACK bits, where K and N are nature numbers.
5. The method of claim 3 , wherein when the value K is less than the value N, last (N−K) bits of the HARQ ACK/NACK message for the transmission block or the HARQ ACK/NACK message for the retransmission block are set by repeating a pattern of the first K bits, where K and N are nature numbers.
6. The method of claim 1 ,
wherein each of a number of bits of the HARQ ACK/NACK message for the transmission block and a number of bits of the HARQ ACK/NACK message for the retransmission block is set to M, and
wherein the value M is determined based on the number of code block groups constituting the transmission block, where M is a natural number.
7. A method for transmitting, by a base station, a transmission block to a terminal, the method comprising:
transmitting a transmission block composed of one or more code block groups to the terminal;
receiving a hybrid automatic repeat request (HARQ) acknowledgement/n negative-acknowledgement (ACK/NACK) message for the transmission block from the terminal;
transmitting a retransmission block configured based on the HARQ ACK/NACK message for the transmission block to the terminal; and
receiving a HARQ ACK/NACK message for the retransmission block from the terminal,
wherein when a total number of code blocks forming the transmission block is equal to C and a total number of code block groups forming the transmission block is equal to G, among the G code block groups, (C mod G) code block groups are composed of ┌C/G┐ code blocks, and the other (G−(C mod G)) code block groups are composed of └C/G┘ code blocks, where C and G are natural number.
8. The method of claim 7 ,
wherein each of the number of bits of the HARQ ACK/NACK message for the transmission block and the number of bits of the HARQ ACK/NACK message for the retransmission block is set to a fixed value N, and
wherein the value N is transmitted to the terminal through high layer signaling, where N is a natural number.
9. The method of claim 8 , wherein a number K of code block groups forming the transmission block or the retransmission block is less than or equal to the value N, where K is a natural number.
10. The method of claim 9 , wherein when the value K is less than the value N, last (N−K) bits of the HARQ ACK/NACK message for the transmission block or the HARQ ACK/NACK message for the retransmission block are set to either NACK bits or ACK bits, where N and K are natural numbers.
11. The method of claim 9 , wherein when the value K is less than the value N, last (N−K) bits of the HARQ ACK/NACK message for the transmission block or the HARQ ACK/NACK message for the retransmission block are set by repeating a pattern of the first K bits, where N and K are natural numbers.
12. The method of claim 7 , wherein each of a number of bits of the HARQ ACK/NACK message for the transmission block and a number of bits of the HARQ ACK/NACK message for the retransmission block is set to M, and the value M is determined based on the number of code block groups constituting the transmission block, where M is a natural number.
13. A terminal for receiving a transmission block from a base station, the terminal comprising:
a receiver configured to receive a transmission block composed of one or more code block groups from the base station and receive a retransmission block configured based on a hybrid automatic repeat request (HARQ) acknowledgement/negative-acknowledgement (ACK/NACK) message for the transmission block from the base station; and
a transmitter configured to transmit the HARQ ACK/NACK message for the transmission block to the base station and transmit a HARQ ACK/NACK message for the retransmission block to the base station,
wherein when a total number of code blocks forming the transmission block is equal to C and a total number of code block groups forming the transmission block is equal to G, among the G code block groups, (C mod G) code block groups are composed of ┌C/G┐ code blocks, and the other (G−(C mod G)) code block groups are composed of └C/G┘ code blocks, where C and G are natural numbers.
14. The terminal of claim 13 ,
wherein each of a number of bits of the HARQ ACK/NACK message for the transmission block and a number of bits of the HARQ ACK/NACK message for the retransmission block is set to a fixed value N, and
wherein the value N is received from the base station through high layer signaling, where N is a natural number.
15. The terminal of claim 14 , wherein a number K of code block groups forming the transmission block or the retransmission block is less than or equal to the value N, where K is a natural number.
16. The terminal of claim 15 , wherein when the value K is less than the value N, i) last (N−K) bits of the HARQ ACK/NACK message for the transmission block or the HARQ ACK/NACK message for the retransmission block are set to either NACK bits or ACK bits or ii) the last (N−K) bits of the HARQ ACK/NACK message for the transmission block or the HARQ ACK/NACK message for the retransmission block are set by repeating a pattern of the first K bits, where N and K are natural numbers.
17. The terminal of claim 13 , wherein each of the number of bits of the HARQ ACK/NACK message for the transmission block and the number of bits of the HARQ ACK/NACK message for the retransmission block is set to M, and
wherein the value M is determined based on the number of code block groups constituting the transmission block, where M is a natural number.