Method and apparatus for transmission or reception of data in communication system

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

• identifying that a downlink limited buffer rate matching (LBRM) is applied;
• receiving, from a base station, a bandwidth part (BWP) configuration for each of a plurality of BWPs of a serving cell in higher layer signaling, each BWP configuration including modulation and coding scheme (MCS) table configuration associated with a physical downlink shared channel (PDSCH) for a corresponding BWP of the serving cell;
• determining a maximum transport block size (TBS) for the downlink LBRM based on a downlink maximum modulation order;
• identifying a length of a circular buffer Ncb for receiving information bits from the base station based on the maximum TBS for the downlink LBRM;
• receiving, from the base station, downlink data signal;
• and
• obtaining information bits associated with the downlink data signal based on the Ncb,
• wherein the downlink maximum modulation order for the serving cell corresponds to 8 in case that the at least one MCS table configuration for at least one BWP among the plurality of BWPs of the serving cell is set to 256QAM, and
• wherein the downlink maximum modulation order for the serving cell corresponds to 6, in case that all MCS table configurations for the plurality of BWPs of the serving cell are set to 64 QAM.

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

• a transceiver;
• and
• at least one processor configured to:
• identify that a downlink limited buffer rate matching (LBRM) is applied,
• transmit, to a terminal, a bandwidth part (BWP) configuration on for each of a plurality of BWPs of a serving cell in higher layer signaling, each BWP configuration including modulation and coding scheme (MCS) table configuration associated with a physical downlink shared channel (PDSCH) for a corresponding BWP of the serving cell,
• encode information bits to be transmitted to the terminal using a low-density parity-check code (LDPC),
• determine a maximum transport block size (TBS) for the downlink LBRM based on a downlink maximum modulation order,
• identify a length of a circular buffer Ncb based on the maximum TBS for the downlink LBRM,
• determine a bit sequence based on the Ncb and the encoded information bits, and
• transmit, to the terminal via the transceiver, the bit sequence,
• wherein the downlink maximum modulation order for the serving cell corresponds to 8 in case that at least one MCS table configuration for at least one BWP among the plurality of BWPs of the serving cell is set to 256 QAM, and
• wherein the downlink maximum modulation order for the serving cell corresponds to 6, in case that all MCS table configurations for the plurality of BWPs of the serving cell are set to 64 QAM.

A terminal in a communication system, the terminal comprising:

• a transceiver;
• and
• at least one processor configured to:
• identify that a downlink limited buffer rate matching (LBRM) is applied,
• receive, from a base station, a bandwidth part (BWP) configuration for each of a plurality of BWPs of a serving cell in higher layer signaling, each BWP configuration including modulation and coding scheme (MCS) table configuration associated with a physical downlink shared channel (PDSCH) for a corresponding BWP of the serving cell,
• determine a maximum transport block size (TBS) for the downlink LBRM based on a downlink maximum modulation order,
• identify a length of a circular buffer Ncb for receiving information bits from the base station based on the maximum TBS for the downlink LBRM,
• receive, from the base station via the transceiver, a downlink data signal, and
• obtain information bits associated with the downlink data signal based on the Ncb,
• wherein the downlink maximum modulation order for the serving cell corresponds to 8 in case that at least one MCS table configuration for at least one BWP among the plurality of BWPs of the serving cell is set to 256 QAM, and
• wherein the downlink maximum modulation order for the serving cell corresponds to 6, in case that all MCS table configurations for the plurality of BWPs of the serving cell are set to 64 QAM.