Scheduling on a cell from different cells

1. A method comprising:

receiving:

first information for first and second scheduling cells of a scheduled cell, and

second information for first and second search space sets for receptions of physical downlink control channels (PDCCHs) from the first and second scheduling cells, respectively, wherein:

the PDCCHs provide downlink control information (DCI) formats with cyclic redundancy checks (CRCs) scrambled by: a cell radio network temporary identifier (C-RNTI), a configured scheduling RNTI (CS-RNTI), or a modulation and coding scheme C-RNTI (MCS-C-RNTI), and

the DCI formats schedule physical uplink shared channel (PUSCH) transmissions, or physical downlink shared channel (PDSCH) receptions, on the scheduled cell;

determining whether to receive the PDCCHs either only from the first scheduling cell or only from the second scheduling cell within a time unit based on the second information; and

receiving the PDCCHs either only from the first scheduling cell or only from the second scheduling cell within the time unit, wherein the time unit has a downlink direction for both the first and second scheduling cells.

2. The method of claim 1 , further comprising:

transmitting a PUSCH on the scheduled cell, wherein the PUSCH transmission is scheduled by a DCI format from the DCI formats.

3. The method of claim 1 , wherein the time unit is a slot of the first scheduling cell or a slot of the second scheduling cell.

4. The method of claim 1 , wherein the time unit is a slot of the scheduled cell.

5. The method of claim 1 , further comprising:

determining a Type-1 hybrid automatic repeat request acknowledgement (HARQ-ACK) codebook for a slot of the scheduled cell based on:

indexes of first control resource sets (CORESETs) on the first scheduling cell, and

indexes of second CORESETs on the second scheduling cell, wherein the PDCCHs from the first scheduling cell and the second scheduling cell are respectively received in the first CORESETs and the second CORESETs.

6. The method of claim 1 , further comprising:

changing an active downlink bandwidth part (DL BWP) to a default DL BWP on the first scheduling cell; and

changing a configuration of search space sets for the PDCCH receptions from the second scheduling cell.

7. The method of claim 1 , further comprising:

receiving a PDCCH that provides a DCI format with a CRC scrambled by a PS-RNTI that indicates to not start a timer for a next discontinuous reception (DRX) cycle on a primary cell; and

suspending the PDCCH receptions from the primary cell and from a secondary cell during the next DRX cycle, wherein:

the first scheduling cell is the primary cell, and

the second scheduling cell is the secondary cell.

8. A user equipment (UE) comprising:

a transceiver configured to receive:

first information for first and second scheduling cells of a scheduled cell, and

second information for first and second search space sets for receptions of physical downlink control channels (PDCCHs) from the first and second scheduling cells, respectively, wherein:

the PDCCHs provide downlink control information (DCI) formats with cyclic redundancy checks (CRCs) scrambled by: a cell radio network temporary identifier (C-RNTI), a configured scheduling RNTI (CS-RNTI), or a modulation and coding scheme C-RNTI (MCS-C-RNTI), and

the DCI formats schedule physical uplink shared channel (PUSCH) transmissions, or physical downlink shared channel (PDSCH) receptions, on the scheduled cell; and

a processor operably coupled to the transceiver, the processor configured to determine whether reception of the PDCCHs is either only from the first scheduling cell or only from the second scheduling cell within a time unit based on the second information,

wherein the transceiver is further configured to receive the PDCCHs either only from the first scheduling cell or only from the second scheduling cell within the time unit, wherein the time unit has a downlink direction for both the first and second scheduling cells.

9. The UE of claim 8 , wherein:

the transceiver is further configured to transmit a PUSCH on the scheduled cell, wherein the PUSCH transmission is scheduled by a DCI format from the DCI formats.

10. The UE of claim 8 , wherein the time unit is a slot of the first scheduling cell or a slot of the second scheduling cell.

11. The UE of claim 8 , wherein the time unit is a slot of the scheduled cell.

12. The UE of claim 8 , wherein:

the processor is further configured to construct a Type-1 hybrid automatic repeat request acknowledgement (HARQ-ACK) codebook for a slot of the scheduled cell based on:

indexes of first control resource sets (CORESETs) on the first scheduling cell, and

indexes of second CORESETs on the second scheduling cell, wherein the PDCCHs from the first scheduling cell and the second scheduling cell are respectively received in the first CORESETs and the second CORESETs.

13. The UE of claim 8 , wherein the processor is further configured to:

change an active downlink bandwidth part (DL BWP) to a default DL BWP on the first scheduling cell; and

change a configuration of search space sets for the PDCCH receptions from the second scheduling cell.

14. The UE of claim 8 , wherein:

the transceiver is further configured to:

receive a PDCCH that provides a DCI format with CRC scrambled by a PS-RNTI that indicates to not start a timer for a next discontinuous reception (DRX) cycle on a primary cell; and

suspend the PDCCH receptions from the primary cell and from a secondary cell during the next DRX cycle, wherein:

the first scheduling cell is the primary cell, and

the second scheduling cell is the secondary cell.

15. A base station comprising:

a transceiver configured to transmit:

first information for first and second scheduling cells of a scheduled cell, and

second information for first and second search space sets for receptions of physical downlink control channels (PDCCHs) from the first and second scheduling cells, respectively, wherein:

the PDCCHs provide downlink control information (DCI) formats with cyclic redundancy check (CRC) scrambled by: a cell radio network temporary identifier (C-RNTI), a configured scheduling RNTI (CS-RNTI), or a modulation and coding scheme C-RNTI (MCS-C-RNTI), and

the DCI formats schedule physical uplink shared channel (PUSCH) transmissions, or physical downlink shared channel (PDSCH) receptions, on the scheduled cell; and

a processor operably coupled to the transceiver, the processor configured to determine whether transmission of the PDCCHs is either only from the first scheduling cell or only from the second scheduling cell within a time unit according to the second information,

wherein the transceiver is further configured to transmit the PDCCHs either only from the first scheduling cell or only from the second scheduling cell within the time unit, wherein the time unit has a downlink direction for both the first and second scheduling cells.

16. The base station of claim 15 , wherein:

the transceiver is further configured to receive a PUSCH on the scheduled cell, wherein the PUSCH reception is scheduled by a DCI format from the DCI formats.

17. The base station of claim 15 , wherein the time unit is a slot of the first scheduling cell or a slot of the second scheduling cell.

18. The base station of claim 15 , wherein the time unit is a slot of the scheduled cell.

19. The base station of claim 15 , wherein:

the processor is further configured to deconstruct a Type-1 hybrid automatic repeat request acknowledgement (HARQ-ACK) codebook for a slot of the scheduled cell based on:

indexes of first control resource sets (CORESETs) on the first scheduling cell, and

indexes of second CORESETs on the second scheduling cell, wherein the PDCCHs from the first scheduling cell and the second scheduling cell are respectively received in the first CORESETs and the second CORESETs.

20. The base station of claim 15 , wherein the processor is further configured to:

change an active downlink bandwidth part (DL BWP) to a default DL BWP on the first scheduling cell; and

change a configuration of search space sets for the PDCCH transmissions from the second scheduling cell.