Method and apparatus for determining transport block size in communication or broadcasting system

A method performed by a base station in a wireless communication system, the method comprising:

• transmitting, to a terminal, the control information for scheduling downlink data;
• and
• transmitting, to the terminal, the downlink data, based on a transport block size (TBS),
• wherein the TBS is a number obtained by subtracting 24 from a multiple of both 8 and a number of code blocks (CBs) for identifying the TBS,
• wherein the number of CBs for identifying the TBS is based on a first determination whether the code rate is smaller than or equal to 1/4, followed by a second determination associated with the number of temporary information bits based on the first determination, and
• wherein the number of temporary information bits is based on a modulation order and the code rate of the downlink data, the modulation order and the code rate being associated with the control information.

A terminal in a wireless communication system, the terminal comprising:

• a transceiver;
• and
• a controller coupled with the transceiver and configured to:
• receive, from a base station, control information for scheduling downlink data,
• identify a number of temporary information bits based on a modulation order and a code rate of the downlink data, the modulation order and the code rate being associated with the control information,
• identify a transport block size (TBS) based on the code rate and the number of temporary information bits, and
• decode the downlink data based on the identified TBS,
• wherein the TBS is a number identified by subtracting 24 from a multiple of both 8 and a number of code blocks (CBs) for identifying the TBS, and
• wherein the number of CBs for identifying the TBS is identified based on a first determination whether the code rate is smaller than or equal to 1/4, followed by a second determination associated with the number of temporary information bits based on the first determination.

A base station in a wireless communication system, the base station comprising:

• a transceiver;
• and
• a controller coupled with the transceiver and configured to:
• transmit, to a terminal, the control information for scheduling downlink data, and
• transmit, to the terminal, the downlink data, based on a transport block size (TBS),
• wherein the TBS is a number obtained by subtracting 24 from a multiple of both 8 and a number of code blocks (CBs) for identifying the TBS,
• wherein the number of CBs for identifying the TBS is based on a first determination whether the code rate is smaller than or equal to 1/4, followed by a second determination associated with the number of temporary information bits based on the first determination, and
• wherein the number of temporary information bits is based on a modulation order and the code rate of the downlink data, the modulation order and the code rate being associated with the control information.