Method and apparatus for performing channel coding and decoding in communication or broadcasting system

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

• identifying a transport block size (TBS) for a physical downlink shared channel (PDSCH);
• transmitting, to a user equipment (UE), downlink control information (DCI) including resource assignment information for the PDSCH;
• and
• transmitting, to the UE, the PDSCH according to the TBS,
• wherein the TBS is associated with a second value N2 corresponding to quantized intermediate information, wherein the quantized intermediate information is defined based on N1/N, where N is an integer,
• wherein a first value N1 corresponding to intermediate information is associated with a number of resource elements (REs) allocated for the PDSCH and a number of layers,
• wherein the number of REs allocated for the PDSCH is associated with a number symbols for the PDSCH and a number of allocated physical resource blocks (PRBs), and
• wherein a number of REs for a demodulation reference signal (DMRS) is excluded for defining the number of REs allocated for the PDSCH.

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

• a transceiver;
• and
• at least one processor configured to:
• receive, from a base station, downlink control information (DCI) including resource assignment information for a physical downlink shared channel (PDSCH),
• identify a number of resource elements (REs) allocated for the PDSCH based on a number symbols for the PDSCH and a number of allocated physical resource blocks (PRBs), wherein a number of REs for a demodulation reference signal (DMRS) is excluded for defining the number of REs allocated for the PDSCH,
• identify a first value N1 corresponding to intermediate information, wherein the first value N1 corresponding to the intermediate information is based on the number of REs allocated for the PDSCH and a number of layers,
• identify a transport block size (TBS) based on a second value N2 corresponding to quantized intermediate information, wherein the second value N2 corresponding to the quantized intermediate information is defined based on N1/N, where N is an integer, and
• receive, from the base station, the PDSCH based on the TBS.

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

• a transceiver;
• and
• at least one processor configured to:
• identify a transport block size (TBS) for a physical downlink shared channel (PDSCH),
• transmit, to a user equipment (UE), downlink control information (DCI) including resource assignment information for the PDSCH, and
• transmit, to the UE, the PDSCH according to the TBS,
• wherein the TBS is associated with a second value N2 corresponding to quantized intermediate information, wherein the quantized intermediate information is defined based on N1/N, where N is an integer,
• wherein a first value N1 corresponding to intermediate information is associated with a number of resource elements (REs) allocated for the PDSCH and a number of layers,
• wherein the number of REs allocated for the PDSCH is associated with a number symbols for the PDSCH and a number of allocated physical resource blocks (PRBs), and
• wherein a number of REs for a demodulation reference signal (DMRS) is excluded for defining the number of REs allocated for the PDSCH.