Device and method for using one piece of downlink conrol information in order to schedule plurality of serving cells in wireless communication system

A method comprising:

• receiving, by a user equipment (UE), configuration information including information related to at least one transmission configuration indication (TCI) state;
• receiving, by the UE, mapping information for a single-cell scheduling, in which a first index and a plurality of TCI states are mapped;
• receiving, by the UE, mapping information for a multi-cell scheduling, in which a second index and the first index are mapped;
• receiving, by the UE, downlink control information (DCI) for the multi-cell scheduling;
• and
• performing, by the UE, communication with at least one of a plurality of cells based on the DCI,
• wherein, based on the first index related to a first cell indicated by the second index included in the DCI being mapped to the plurality of TCI states, an operation of determining at least one TCI state applied to the first cell or an operation of determining whether a scheduling of the first cell is valid is performed.

A user equipment (UE) comprising:

• a transceiver;
• and
• a processor connected to the transceiver,
• wherein the processor is configured to:
• receive configuration information including information related to at least one transmission configuration indication (TCI) state;
• receive mapping information for a single-cell scheduling, in which a first index and a plurality of TCI states are mapped;
• receive mapping information for a multi-cell scheduling, in which a second index and the first index are mapped;
• receive downlink control information (DCI) for the multi-cell scheduling;
• and
• perform communication with at least one of a plurality of cells based on the DCI,
• wherein, based on the first index related to a first cell indicated by the second index included in the DCI being mapped to the plurality of TCI states, an operation of determining at least one TCI state applied to the first cell or an operation of determining whether a scheduling of the first cell is valid is performed.

A communication device comprising:

• at least one processor;
• and
• at least one computer memory connected to the at least one processor and storing instructions that direct operations when executed by the at least one processor, the operations comprising:
• receiving configuration information including information related to at least one transmission configuration indication (TCI) state;
• receiving mapping information for a single-cell scheduling, in which a first index and a plurality of TCI states are mapped;
• receiving mapping information for a multi-cell scheduling, in which a second index and the first index;
• receiving downlink control information (DCI) for the multi-cell scheduling;
• and
• performing communication with at least one of a plurality of cells based on the DCI,
• wherein, based on the first index related to a first cell indicated by the second index included in the DCI being mapped to the plurality of TCI states, an operation of determining at least one TCI state applied to the first cell or an operation of determining whether a scheduling of the first cell is valid is performed.