User equipment and base station that communicate with each other and operating method thereof
An operating method of a user equipment (UE) includes receiving a physical downlink control channel (PDCCH) from a base station (BS), wherein the PDCCH corresponds to a cell group including a plurality of cells, and wherein the PDCCH is received through a certain cell of the cell group; acquiring downlink control information (DCI) from the PDCCH, identifying whether scheduling has been performed on the cell group based on the DCI, and receiving physical downlink shared channels (PDSCHs) from the base station (BS) based on the DCI, wherein the PDSCHs correspond to the cell group and are received through the plurality of cells.
1 . A method of wireless communication, the method comprising:
transmitting, to a base station (BS), performance information of a user equipment (UE) associated with scheduling for a cell group including a plurality of cells, wherein the performance information of the UE indicates a cell selection method suitable for scheduling through higher layer signaling;
selecting, by the BS, a certain cell from the cell group based on the cell selection method indicated by the performance information of the UE;
receiving a physical downlink control channel (PDCCH) from the BS through the certain cell of the cell group, wherein the PDCCH corresponds to the cell group;
acquiring downlink control information (DCI) from the PDCCH;
identifying whether scheduling has been performed on the cell group based on the DCI; and
receiving physical downlink shared channels (PDSCHs) from the BS based on the DCI, wherein the PDSCHs correspond to the cell group and are received through the plurality of cells,
wherein the cell selection method corresponds to one of a first cell selection method and a second cell selection method,
wherein an arbitrary cell is selected from among the plurality of cells as the certain cell based on the first cell selection method, and
wherein a predefined cell is selected from one or more predefined cells in the plurality of cells as the certain cell based on the second cell selection method.
2 . The method of claim 1 , further comprising:
performing the higher layer signaling for scheduling setting for the BS and the cell group.
3 . The method of claim 2 , wherein the scheduling setting for the cell group includes setting for a plurality of cell groups, wherein the plurality of cell groups include the cell group and cells included in each of the plurality of cell groups.
4 . The method of claim 1 , wherein the performance information further includes at least one of cells supportable by the UE, and the number of supportable cells.
5 . The method of claim 1 , wherein the identifying of whether scheduling has been performed on the cell group further includes:
identifying the cell group based on a cell group indicator field included in the DCI.
6 . The method of claim 5 , wherein the identifying of the cell group includes identifying the cell group based on a value of a code of the cell group indicator field.
7 . The method of claim 5 , wherein the identifying of the cell group includes identifying the plurality of cells based on a value of a bitmap of the cell group indicator field.
8 . The method of claim 5 , wherein the identifying of the cell group includes:
identifying the cell group based on some of bits of the cell group indicator field and identifying the plurality of cells based on the rest of the bits of the cell group indicator field.
9 . The method of claim 1 , wherein the identifying of whether scheduling has been performed on the cell group includes identifying whether scheduling has been performed on the cell group based on information on resources allocated for transmission of the PDCCH included in the DCI.
10 . The method of claim 1 , wherein the identifying of whether scheduling has been performed on the cell group includes identifying whether scheduling has been performed on the cell group based on a format of the DCI.
11 . The method of claim 1 , wherein the identifying of whether scheduling has been performed on the cell group includes identifying whether scheduling has been performed on the cell group based on a radio network temporary identifier (RNTI) used when blind decoding for the PDCCH is successful.
12 . The method of claim 1 , further comprising:
determining PDCCH candidates considering scheduling for the cell group.
13 . The method of claim 1 , wherein the DCI includes a carrier index having a value corresponding to any one of the plurality of cells.
14 . The method of claim 1 , wherein the receiving of the PDSCHs corresponding to the cell group through the plurality of cells includes determining a size of a frequency domain resource allocation field included in the DCI based on a cell having a largest bandwidth portion or matching a largest band, among the plurality of cells.
15 . A method of a base station (BS), the method comprising:
performing higher layer signaling for scheduling setting for a user equipment (UE) and a cell group, wherein the performing comprises:
receiving performance information of the UE associated with scheduling for the cell group including a plurality of cells, wherein the performance information of the UE indicates a cell selection method suitable for scheduling through the higher layer signaling, and
selecting a certain cell from the cell group based on the cell selection method indicated by the performance information of the UE;
generating downlink control information (DCI) including information indicating at least one of the cell group and the plurality of cells included in the cell group based on the higher layer signaling;
scheduling a physical downlink control channel (PDCCH) including the DCI based on the selected certain cell and corresponding to the cell group; and
transmitting the scheduled PDCCH to the UE,
wherein the cell selection method corresponds to one of a first cell selection method and a second cell selection method,
wherein an arbitrary cell is selected from among the plurality of cells as the certain cell based on the first cell selection method, and
wherein a predefined cell is selected from one or more predefined cells in the plurality of cells as the certain cell based on the second cell selection method.
16 . The method of claim 15 , wherein
the generating of the DCI includes selecting the cell group including the plurality of cells matching the performance information.
17 . The method of claim 15 , wherein the number of the plurality of cells is at least two.
18 . A method of wireless communication, the method comprising:
transmitting, to a base station (BS), performance information of a user equipment (UE) associated with scheduling for a cell group including a plurality of cells, wherein the performance information of the UE indicates a cell selection method suitable for scheduling through higher layer signaling;
selecting, by the BS, a first cell from the cell group based on the cell selection method indicated by the performance information of the UE;
receiving a physical downlink control channel (PDCCH) from the BS using the first cell of the cell group;
acquiring downlink control information (DCI) from the PDCCH, wherein the DCI includes scheduling information for the first cell and a second cell of the cell group; and
receiving physical downlink shared channels (PDSCHs) from BS based on the DCI using the first cell and the second cell,
wherein the cell selection method corresponds to one of a first cell selection method and a second cell selection method,
wherein an arbitrary cell is selected from among the plurality of cells as the first cell based on the first cell selection method, and
wherein a predefined cell is selected from one or more predefined cells in the plurality of cells as the first cell based on the second cell selection method.