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:

• transmitting, to a user equipment (UE), downlink control information including resource assignment information of a physical downlink shared channel (PDSCH);
• identifying a number of resource elements (REs) for the PDSCH according to the resource assignment information of the PDSCH;
• identifying a temporary transport block size (TBS) based on the number of REs for the PDSCH;
• identifying a TBS based on the temporary TBS;
• and
• transmitting, to the UE, the PDSCH based on the TBS,
• wherein the number of REs for the PDSCH is identified by excluding a number of REs associated with a channel state information reference signal (CSI-RS) and a control channel.

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

• a transceiver;
• and
• a controller configured to:
• receive, from a base station, downlink control information including resource assignment information of a physical downlink shared channel (PDSCH);
• identify a number of resource elements (REs) for the PDSCH based on the resource assignment information of the PDSCH;
• identify a temporary transport block size (TBS) based on the number of REs for the PDSCH;
• identify a TBS based on the temporary TBS;
• and
• receive, from the base station, the PDSCH based on the TBS,
• wherein the number of REs for the PDSCH is identified by excluding a number of REs associated with a channel state information reference signal (CSI-RS) and a control channel.

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

• a transceiver;
• and
• a controller configured to:
• transmit, to a user equipment (UE), downlink control information including resource assignment information of a physical downlink shared channel (PDSCH);
• identify a number of resource elements (REs) for the PDSCH according to the resource assignment information of the PDSCH;
• identify a temporary transport block size (TBS) based on the number of REs for the PDSCH;
• identify a TBS based on the temporary TBS;
• and
• transmit, to the UE, the PDSCH based on the TBS,
• wherein the number of REs for the PDSCH is identified by excluding a number of REs associated with a channel state information reference signal (CSI-RS) and a control channel.