Method and base station for transmitting downlink control information, and user equipment, apparatus, and storage medium for receiving downlink control information
A base station and a user equipment may determine whether to determine a start symbol value representing a start symbol of a physical downlink shared channel (PDSCH) on the basis of a reference point which is different from the start of a slot allocated for the PDSCH of a cell and is based on the subcarrier spacing of the cell and the subcarrier spacing of a scheduling cell for the cell. The base station/user equipment may transmit/receive, through the scheduling cell, the DCI including symbol information on the start symbol value for the PDSCH on the basis of the determination.
1. A method for receiving a downlink channel by a user equipment in a wireless communication system, the method comprising:
detecting, on a scheduling cell for a cell, a downlink control information (DCI) format 1_2 that includes information regarding a start symbol S of a physical downlink shared channel (PDSCH) on the cell and a length L for the PDSCH; and
receiving the PDSCH in L consecutive symbols starting from the start symbol S in a slot allocated for the PDSCH based on the DCI format 1_2,
wherein
based on the user equipment being configured with a reference of start and length indicator value (SLIV) for the DCI format 1_2: the start symbol S is relative to a start symbol of a physical downlink control channel (PDCCH) monitoring occasion in which the DCI format 1_2 is detected; and
based on the user equipment being not configured with the reference of SLIV for the DCI format 1_2: the start symbol S is relative to a start of the slot allocated for the PDSCH, and
wherein the user equipment is not expected to be configured with the reference of SLIV for the DCI format 1_2 for the cell when a subcarrier spacing of the cell is different from a subcarrier spacing of the scheduling cell.
2. The method according to claim 1 , wherein the user equipment is configured with the reference of SLIV for the DCI format 1_2 for the cell in a state in which the subcarrier spacing of the cell is equal to the subcarrier spacing of the scheduling cell.
3. The method according to claim 1 , wherein the DCI format 1_2 includes a time domain resource allocation field that provides a value m for a row index m+1 to a PDSCH allocation table, and
wherein the PDSCH allocation table includes a plurality of rows, where each row defines at least a downlink assignment to PDSCH slot offset K0 and a SLIV.
4. A user equipment for receiving a downlink channel in a wireless communication system, the user equipment comprising:
at least one transceiver;
at least one processor; and
at least one computer memory operably connectable to the at least one processor and storing instructions that, when executed, cause the at least one processor to perform operations, the operations comprising:
detecting, on a scheduling cell for a cell, a downlink control information (DCI) format 1_2 that includes information regarding a start symbol S of a physical downlink shared channel (PDSCH) on the cell and a length L for the PDSCH; and
receiving the PDSCH in L consecutive symbols starting from the start symbol S in a slot allocated for the PDSCH based on the DCI format 1_2,
wherein
based on the user equipment being configured with a reference of start and length indicator value (SLIV) for the DCI format 1_2: the start symbol S is relative to a start symbol of a physical downlink control channel (PDCCH) monitoring occasion in which the DCI format 1_2 is detected; and
based on the user equipment being not configured with the reference of SLIV for the DCI format 1_2: the start symbol S is relative to a start of the slot allocated for the PDSCH, and
wherein the user equipment is not expected to be configured with the reference of SLIV for the DCI format 1_2 for the cell when a subcarrier spacing of the cell is different from a subcarrier spacing of the scheduling cell.
5. The user equipment according to claim 4 , wherein the user equipment is configured with the reference of SLIV for the DCI format 1_2 for the cell in a state in which the subcarrier spacing of the cell is equal to the subcarrier spacing of the scheduling cell.
6. The user equipment according to claim 4 , wherein the DCI format 1_2 includes a time domain resource allocation field that provides a value m for a row index m+1 to a PDSCH allocation table, and
wherein the PDSCH allocation table includes a plurality of rows, where each row defines at least a downlink assignment to PDSCH slot offset K0 and a SLIV.
7. A base station for transmitting a downlink channel to a user equipment in a wireless communication system, the base station comprising:
at least one transceiver;
at least one processor; and
at least one computer memory operably connectable to the at least one processor and storing instructions that, when executed, cause the at least one processor to perform operations, the operations comprising:
transmitting, on a scheduling cell for a cell, a downlink control information (DCI) format 1 2, that includes information regarding a start symbol S of a physical downlink shared channel (PDSCH) on the cell and a length L for the PDSCH, to the user equipment; and
transmitting the PDSCH in L consecutive symbols starting from the start symbol S in a slot allocated for the PDSCH to the user equipment based on the DCI format 1_2,
wherein
based on the user equipment being configured with a reference of start and length indicator value (SLIV) for the DCI format 1 2: the start symbol S is relative to a start symbol of a physical downlink control channel (PDCCH) monitoring occasion in which the DCI format 1 2 is detected; and
based on the user equipment being not configured with the reference of SLIV for the DCI format 1 2: the start symbol S is relative to a start of the slot allocated for the PDSCH, and
wherein the base station does not configure the user equipment with the reference of SLIV for the DCI format 1 2 for the cell when a subcarrier spacing of the cell is different from a subcarrier spacing of the scheduling cell.
8. The base station according to claim 7 , wherein the base station configures the user equipment with the reference of SLIV for the DCI format 1_2 for the cell in a state in which the subcarrier spacing of the cell is equal to the subcarrier spacing of the scheduling cell.
9. The base station according to claim 7 , wherein the DCI format 1_2 includes a time domain resource allocation field that provides a value m for a row index m+1 to a PDSCH allocation table, and
wherein the PDSCH allocation table includes a plurality of rows, where each row defines at least a downlink assignment to PDSCH slot offset K0 and a SLIV.