Method and apparatus for performing communication in wireless communication system

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

• a transceiver;
• and
• at least one processor coupled with the transceiver and configured to:
• receive, from a terminal, capability information indicating that the terminal can be scheduled in multiple cells,
• transmit, to the terminal, downlink control information (DCI) related with a plurality of cells scheduled for the terminal, and
• transmit a physical downlink shared channel (PDSCH) through the plurality of cells,
• wherein the at least one processor is further configured to:
• transmit, to the terminal, quasi co-located (QCL) time values of the plurality of cells,
• wherein in case that an interval between a symbol on which transmission of a physical downlink control channel (PDCCH) comprising the DCI ends and a start symbol of the PDSCH is equal to or less than a maximum value among the QCL time values, decoding of the PDSCH is performed at the terminal, based on a transmission configuration indication (TCI) state indicated by a codepoint having a lowest value, among a plurality of TCI states activated through medium access control (MAC) control element (CE),
• wherein a plurality of codepoints for the plurality of cells and the plurality of TCI states activated through the MAC CE are mapped in an ascending order of codepoint values and TCI state identity (ID) values, and
• wherein the plurality of TCI states activated through the MAC CE is included in a TCI state list for each of the plurality of cells obtained at the terminal.

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

• transmitting, to a base station, capability information indicating that the terminal can be scheduled in multiple cells;
• receiving, from the base station, downlink control information (DCI) related with a plurality of cells scheduled for the terminal;
• and
• receiving a physical downlink shared channel (PDSCH) through the plurality of cells,
• wherein the method further comprises:
• obtaining quasi co-located (QCL) time values of the plurality of cells;
• and
• in case that an interval between a symbol on which transmission of a physical downlink control channel (PDCCH) comprising the DCI ends and a start symbol of the PDSCH is equal to or less than a maximum value among the QCL time values, performing decoding of the PDSCH based on a transmission configuration indication (TCI) state indicated by a codepoint having a lowest value, among a plurality of TCI states activated through medium access control (MAC) control element (CE),
• wherein a plurality of codepoints for the plurality of cells and the plurality of TCI states activated through the MAC CE are mapped in an ascending order of codepoint values and TCI state identity (ID) values, and
• wherein the plurality of TCI states activated through the MAC CE is included in a TCI state list for each of the plurality of cells obtained at the terminal.

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

• receiving, from a terminal, capability information indicating that the terminal can be scheduled in multiple cells;
• transmitting, to the terminal, downlink control information (DCI) related with a plurality of cells scheduled for the terminal;
• and
• transmitting a physical downlink shared channel (PDSCH) through the plurality of cells,
• wherein the method further comprises:
• transmitting, to the terminal, quasi co-located (QCL) time values of the plurality of cells,
• wherein in case that an interval between a symbol on which transmission of a physical downlink control channel (PDCCH) comprising the DCI ends and a start symbol of the PDSCH is equal to or less than a maximum value among the QCL time values, decoding of the PDSCH is performed at the terminal, based on a transmission configuration indication (TCI) state indicated by a codepoint having a lowest value, among a plurality of TCI states activated through medium access control (MAC) control element (CE),
• wherein a plurality of codepoints for the plurality of cells and the plurality of TCI states activated through the MAC CE are mapped in an ascending order of codepoint values and TCI state identity (ID) values, and
• wherein the plurality of TCI states activated through the MAC CE is included in a TCI state list for each of the plurality of cells obtained at the terminal.