Method of retransmitting transmission block for new radio and apparatus using the same
Provided is a method of requesting, by a terminal, retransmission of a TB. The method may include: receiving a TB configured with K code blocks (CBs) and M code block groups (CBGs) from a base station (BS); determining whether reception of the TB is successful; and transmitting retransmission information about the TB to the BS when it is determined that the reception of the TB fails.
1. A method of requesting, by a terminal, retransmission of a transmission block (TB), the method comprising:
receiving a TB configured with K code blocks (CBs) and M code block groups (CBGs) from a base station (BS) where K and M are natural numbers greater than or equal to 1;
determining whether reception of the TB is successful; and
transmitting retransmission information about the TB to the BS when the reception of the TB fails,
wherein the retransmission information about the TB is configured with N bits where N is a natural number greater than or equal to 1,
the retransmission information indicates retransmission of a whole TB when a cyclic redundancy check (CRC) check is successful with regard to all of the CBs of the TB and when a CRC check fails with regard to the whole TB,
wherein the N value is given through higher layer signaling, and
wherein, when the N value is greater than the M value, a first set of M bits of the N bits are mapped to different CBGs, and a last set of (N-M) bits of the N bits are set to NACK bits.
2. The method according to claim 1 , wherein all of the N bits are set to NACK bits when the CRC check is successful with regard to all of the CBs that constitute the TB and when the CRC check fails with regard to the whole TB.
3. A method of receiving retransmission information about a transmission block (TB) in a base station (BS), the method comprising:
transmitting a TB configured with K code blocks (CBs) and M code block groups (CBGs) to a terminal where K and M are natural numbers greater than or equal to 1; and
receiving the retransmission information about the TB from the terminal,
wherein the retransmission information about the TB is configured with N bits, N is a natural number greater than or equal to 1,
the retransmission information indicates retransmission of a whole TB when a cyclic redundancy check (CRC) check is successful with regard to all of the CBs that constitute the TB and when a CRC check fails with regard to the whole TB,
wherein the N value is indicated through higher layer signaling, and
wherein, when the N value is greater than the M value, a first set of M bits of the N bits are mapped to different CBGs, and a last set of (N-M) bits of the N bits are always set to NACK bits.
4. The method according to claim 3 , wherein all of the N bits are set to NACK bits when the CRC check is successful with regard to all of the CBs that constitute the TB and when the CRC check fails with regard to the whole TB.
5. A terminal for requesting retransmission of a transmission block (TB), the terminal comprising:
a receiver configured to receive a TB configured with K code blocks (CBs) and M code block groups (CBGs) from a base station (BS) where K and M are natural numbers greater than or equal to 1;
a controller configured to determine whether reception of the TB is successful; and
a transmitter configured to transmit retransmission information about the TB to the BS when the reception of the TB fails,
wherein the retransmission information about the TB is configured with N bits where N is a natural number greater than or equal to 1,
the retransmission information indicates retransmission of a whole TB when a cyclic redundancy check (CRC) check is successful with regard to all of the CBs that constitute the TB and when a CRC check fails with regard to the whole TB,
wherein the N value is given through higher layer signaling, and
wherein, when the N value is greater than the M value, a first set of M bits of the N bits are mapped to different CBGs, and a last set of (N-M) bits of the N bits are always set to NACK bits.
6. The terminal according to claim 5 , wherein all of the N bits are set to NACK bits when the CRC check is successful with regard to all of the CBs that constitute the TB and when the CRC check fails with regard to the whole TB.