Adaptive cross-carrier scheduling and flexible PUCCH groups
Methods and apparatuses for adaptive cross-carrier scheduling and flexible physical uplink control channel (PUCCH) groups. A method for receiving physical downlink control channels (PDCCHs) or transmitting PUCCHs includes receiving first information for a first group of cells and for a second group of cells and receiving second information for activation of only one of the first group of cells and the second group of cells. The method also includes determining a group of cells to be activated based on the second information and receiving the PDCCHs only on first cells from the activated group of cells or transmitting PUCCHs only on second cells from the activated group of cells.
1. A method for receiving physical downlink control channels (PDCCHs), the method comprising:
receiving first information for first search space sets associated with receptions of first PDCCHs on a first scheduling cell, wherein:
the first PDCCHs have subcarrier spacing (SCS) configuration μ1,
a first PDCCH from the first PDCCHs provides a first downlink control information (DCI) format,
the first DCI format schedules a first physical downlink shared channel (PDSCH) reception or a first physical uplink shared channel (PUSCH) transmission on a scheduled cell, and
the first DCI format is from a first set of DCI formats;
receiving second information for second search space sets associated with receptions of second PDCCHs on a second scheduling cell, wherein:
the second PDCCHs have SCS configuration μ2,
a second PDCCH from the second PDCCHs provides a second DCI format,
the second DCI format schedules a second PDSCH reception or a second PUSCH transmission on the scheduled cell, and
the second DCI format is from a second set of DCI formats, wherein the second set of DCI formats is different from the first set of DCI formats; and
determining:
a first number of scheduled cells associated with scheduling cells having PDCCH receptions with SCS configuration μ1, wherein, when μ1=μ2, the scheduled cell is counted once towards the first number of scheduled cells, and
a second number of scheduled cells associated with scheduled cells having PDCCH receptions with SCS configuration μ2 wherein, when μ1<μ2, the scheduled cell is counted once towards a sum of:
the first number of scheduled cells, and
the second number of scheduled cells.
2. The method of claim 1 , wherein the first scheduling cell is a primary cell (PCell), the second scheduling cell is a secondary cell (SCell), and the scheduled cell is the PCell.
3. The method of claim 1 , wherein the first scheduling cell and the scheduled cell is a same cell.
4. The method of claim 1 , further comprising:
determining a number of PDCCH receptions over a number of non-overlapping control channel elements (CCEs) in a slot of the first scheduling cell based on the second search space sets, wherein:
the number of PDCCH receptions does not exceed (1−α)·min(M PDCCH total,slot,μ1 ,M PDCCH max,slot,μ1 ),
the number of non-overlapping CCEs does not exceed (1−α)·min(C PDCCH total,slot,μ1 ,C PDCCH max,slot,μ1 ),
α is a scaling factor,
M PDCCH total, slot,μ1 and C PDCCH total, slot,μ1 are respectively a total number of PDCCH receptions and a total number of non-overlapping CCEs per slot for the first scheduling cell,
M PDCCH max, slot,μ1 and C PDCCH total, slot,μ1 are respectively a maximum number of PDCCH receptions and a maximum number of non-overlapping CCEs per slot for the first scheduling cell, and
μ1≤μ2.
5. The method of claim 4 , further comprising receiving third information indicating the scaling factor α.
6. The method of claim 4 , wherein M PDCCH total, slot,μ1 and C PDCCH total, slot,μ1 are determined based on the first number of scheduled cells.
7. The method of claim 4 , wherein:
α=1 when the second scheduling cell is a deactivated cell or an active downlink (DL) bandwidth part (BWP) of the second scheduling cell is a dormant BWP.
8. A user equipment (UE) comprising:
a transceiver configured to receive:
first information for first search space sets associated with receptions of first physical downlink control channels (PDCCHs) on a first scheduling cell, wherein:
the first PDCCHs have subcarrier spacing (SCS) configuration μ1,
a first PDCCH from the first PDCCHs provides a first downlink control information (DCI) format,
the first DCI format schedules a first physical downlink shared channel (PDSCH) reception or a first physical uplink shared channel (PUSCH) transmission on a scheduled cell, and
the first DCI format is from a first set of DCI formats;
second information for second search space sets associated with receptions of second PDCCHs on a second scheduling cell, wherein:
the second PDCCHs have SCS configuration μ2,
a second PDCCH from the second PDCCHs provides a second DCI format,
the second DCI format schedules a second PDSCH reception or a second PUSCH transmission on the scheduled cell, and
the second DCI format is from a second set of DCI formats, wherein the second set of DCI formats is different from the first set of DCI formats; and
a processor operably coupled to the transceiver, the processor configured to:
determine a first number of scheduled cells associated with scheduling cells having PDCCH receptions with SCS configuration μ1, wherein, when μ1=μ2, the scheduled cell is counted once towards the first number of scheduled cells, and
determine a second number of scheduled cells associated with scheduling cells having PDCCH receptions with SCS configuration μ2 wherein, when μ1<μ2, the scheduled cell is counted once towards a sum of:
the first number of scheduled cells, and
the second number of scheduled cells.
9. The UE of claim 8 , wherein the first scheduling cell is a primary cell (PCell), the second scheduling cell is a secondary cell (SCell), and the scheduled cell is the PCell.
10. The UE of claim 8 , wherein the first scheduling cell and the scheduled cell is a same cell.
11. The UE of claim 8 , wherein the processor is further configured to:
determine a number of PDCCH receptions over a number of non-overlapping control channel elements (CCEs) in a slot of the first scheduling cell based on the second search space sets, wherein:
the number of PDCCH receptions does not exceed (1−α)·min(M PDCCH total,slot,μ1 ,M PDCCH max,slot,μ1 ),
the number of non-overlapping CCEs does not exceed (1−α)·min(C PDCCH total,slot,μ1 ,C PDCCH max,slot,μ1 ),
α is a scaling factor,
M PDCCH total,slot,μ1 and C PDCCH total,slot,μ1 are respectively a total number of PDCCH receptions and a total number of non-overlapping CCEs per slot for the first scheduling cell,
M PDCCH max,slot,μ1 and C PDCCH max,slot,μ1 are respectively a maximum number of PDCCH receptions and a maximum number of non-overlapping CCEs per slot for the first scheduling cell, and
μ1≤μ2.
12. The UE of claim 11 , wherein the transceiver is further configured to receive third information indicating the scaling factor α.
13. The UE of claim 11 , wherein the processor is further configured to determine M PDCCH total,slot,μ1 and C PDCCH total,slot,μ1 based on the first number of scheduled cells.
14. The UE of claim 11 , wherein:
α=1 when the second scheduling cell is a deactivated cell or an active downlink (DL) bandwidth part (BWP) of the second scheduling cell is a dormant BWP.
15. A base station comprising:
a transceiver configured to transmit:
first information for first search space sets associated with receptions of first physical downlink control channels (PDCCHs) on a first scheduling cell, wherein:
the first PDCCHs have subcarrier spacing (SCS) configuration μ1,
a first PDCCH from the first PDCCHs provides a first downlink control information (DCI) format,
the first DCI format schedules a first physical downlink shared channel (PDSCH) reception or a first physical uplink shared channel (PUSCH) transmission on a scheduled cell, and
the first DCI format is from a first set of DCI formats;
second information for second search space sets associated with receptions of second PDCCHs on a second scheduling cell, wherein:
the second PDCCHs have SCS configuration μ2,
a second PDCCH from the second PDCCHs provides a second DCI format,
the second DCI format schedules a second PDSCH reception or a second PUSCH transmission on the scheduled cell, and
the second DCI format is from a second set of DCI formats, wherein the second set of DCI formats is different from the first set of DCI formats; and
a processor operably coupled to the transceiver, the processor configured to:
determine a first number of scheduled cells associated with scheduling cells having PDCCH receptions with SCS configuration μ1, wherein, when μ1=μ2, the scheduled
cell is counted once towards the first number of scheduled cells, and
determine a second number of scheduled cells associated with scheduling cells having PDCCH receptions with SCS configuration μ2 wherein, when μ1<μ2, the scheduled cell is counted once towards a sum of:
the first number of scheduled cells, and
the second number of scheduled cells.
16. The base station of claim 15 , wherein the first scheduling cell is a primary cell (PCell), the second scheduling cell is a secondary cell (SCell), and the scheduled cell is the PCell.
17. The base station of claim 15 , wherein the first scheduling cell and the scheduled cell is a same cell.
18. The base station of claim 15 , wherein the processor is further configured to:
determine a number of PDCCH receptions over a number of non-overlapping control channel elements (CCEs) in a slot of the first scheduling cell based on the second search space sets, wherein:
the number of PDCCH receptions does not exceed (1−α)·min(M PDCCH total,slot,μ1 ,M PDCCH max,slot,μ1 ),
the number of non-overlapping CCEs does not exceed (1−α)·min(C PDCCH total,slot,μ1 ,C PDCCH max,slot,μ1 ),
α is a scaling factor,
M PDCCH total,slot,μ1 and C PDCCH total,slot,μ1 are respectively a total number of PDCCH M PDCCH receptions and a total number of non-overlapping CCEs per slot for the first scheduling cell,
M PDCCH max,slot,μ1 and C PDCCH max,slot,μ1 are respectively a maximum number of PDCCH receptions and a maximum number of non-overlapping CCEs per slot for the first scheduling cell, and
μ1<μ2.
19. The base station of claim 18 , wherein the transceiver is further configured to transmit third information indicating the scaling factor α.
20. The base station of claim 18 , wherein the processor is further configured to determine M PDCCH total,slot,μ1 and C PDCCH total,slot,μ1 based on the first number of scheduled cells.