Control signaling design for improved resource utilization
Methods and apparatuses for PDCCH reception and transmission. A method for PDCCH reception includes transmitting a capability for receptions of PDCCHs on a downlink (DL) cell. PDCCH receptions on the DL cell are according to (X 1 , Y 1 ) or (X 2 , Y 2 ) when any two PDCCH receptions are within Y 1 or Y 2 symbols or have first symbols separated by at least X 1 or X 2 symbols, respectively. The method further includes receiving a configuration of search space sets for PDCCH receptions on the DL cell; determining, based on the configuration of the search space sets, whether PDCCH receptions are according to (X 2 , Y 2 ); and receiving on the DL cell: a maximum number of M PDCCH max,X 1 ,μ PDCCHs within Y 1 symbols when PDCCH receptions are not according to (X 2 , Y 2 ), and a maximum number of M PDCCH max,X 2 ,μ PDCCHs within Y 2 symbols when PDCCH receptions are according to (X 2 , Y 2 ).
1. A method comprising:
receiving:
first information for first search space sets for receptions of first physical downlink control channels (PDCCHs) on a first cell,
second information for second search space sets for receptions of second PDCCHs on a second cell, wherein:
the receptions of the first PDCCHs and of the second PDCCHs are in non-overlapping slots of the first cell and of the second cell, and
the first PDCCHs and the second PDCCHs provide respective downlink control information (DCI) formats for scheduling on the first cell, and
a first PDCCH from the first PDCCHs or from the second PDCCHs; and
transmitting a physical uplink shared channel (PUSCH) on the first cell, wherein the first PDCCH provides a first DCI format scheduling the PUSCH transmission,
wherein the receptions of the first PDCCHs are with different sub-carrier spacing (SCS) than the receptions of the second PDCCHs.
2. The method of claim 1 , wherein:
the first PDCCH is from the second PDCCHs, and
the first cell is a primary cell.
3. The method of claim 1 , wherein:
the first DCI format includes a carrier indicator field (CIF) having a value,
the value is zero when the first PDCCH is from the first PDCCHs, and
the value is a positive integer when the first PDCCH is from the second PDCCHs.
4. The method of claim 1 , further comprising:
receiving:
third information for a first downlink (DL) bandwidth part (BWP) on the second cell, and
fourth information for a second DL BWP on the second cell, wherein:
when an active DL BWP on the second cell is the first DL BWP, the first PDCCH is from the first PDCCHs or from the second PDCCHs, and
when an active DL BWP on the second cell is the second DL BWP, the first PDCCH is only from the first PDCCHs.
5. The method of claim 1 , further comprising:
receiving:
a second PDCCH from the first PDCCHs or from the second PDCCHs, and
a physical downlink shared channel (PDSCH) on the first cell, wherein the second PDCCH provides a second DCI format scheduling the PDSCH reception.
6. The method of claim 5 , wherein:
the second PDCCH reception is in first frequency resources within a first bandwidth,
the PDSCH reception is in second frequency resources within a second bandwidth, and
a maximum size of the first bandwidth is larger than a maximum size of the second bandwidth.
7. The method of claim 5 , further comprising:
receiving:
third information for a set of physical uplink control channel (PUCCH) resources on the first cell, and
fourth information for a set of PUCCH resources on a third cell; and
transmitting a PUCCH, wherein:
the second DCI format includes a field indicating the first cell or the third cell,
the PUCCH provides acknowledgement information associated with the PDSCH reception, and
the PUCCH transmission is on the first cell or on the third cell based on the indication of the field.
8. A user equipment (UE) comprising a transceiver configured to:
receive:
first information for first search space sets for receptions of first physical downlink control channels (PDCCHs) on a first cell,
second information for second search space sets for receptions of second PDCCHs on a second cell, wherein:
the receptions of the first PDCCHs and of the second PDCCHs are in non-overlapping slots of the first cell and of the second cell, and
the first PDCCHs and the second PDCCHs provide respective downlink control information (DCI) formats for scheduling on the first cell, and
a first PDCCH from the first PDCCHs or from the second PDCCHs; and
transmit a physical uplink shared channel (PUSCH) on the first cell, wherein the first PDCCH provides a first DCI format scheduling the PUSCH transmission,
wherein the receptions of the first PDCCHs are with different sub-carrier spacing (SCS) than the receptions of the second PDCCHs.
9. The UE of claim 8 , wherein:
the first PDCCH is from the second PDCCHs, and
the first cell is a primary cell.
10. The UE of claim 8 , wherein:
the first DCI format includes a carrier indicator field (CIF) having a value,
the value is zero when the first PDCCH is from the first PDCCHs, and
the value is a positive integer when the first PDCCH is from the second PDCCHs.
11. The UE of claim 8 , wherein the transceiver is further configured to receive:
third information for a first downlink (DL) bandwidth part (BWP) on the second cell, and
fourth information for a second DL BWP on the second cell, wherein:
when an active DL BWP on the second cell is the first DL BWP, the first PDCCH is from the first PDCCHs or from the second PDCCHs, and
when an active DL BWP on the second cell is the second DL BWP, the first PDCCH is only from the first PDCCHs.
12. The UE of claim 8 , wherein the transceiver is further configured to receive:
a second PDCCH from the first PDCCHs or from the second PDCCHs, and
a physical downlink shared channel (PDSCH) on the first cell, wherein the second PDCCH provides a second DCI format scheduling the PDSCH reception.
13. The UE of claim 12 , wherein:
the second PDCCH reception is in frequency resources within a first bandwidth,
the PDSCH reception is in frequency resources within a second bandwidth, and
a maximum size of the first bandwidth is larger than a maximum size of the second bandwidth.
14. The UE of claim 12 , wherein the transceiver is further configured to:
receive:
third information for a set of physical uplink control channel (PUCCH) resources on the first cell, and
fourth information for a set of PUCCH resources on a third cell; and
transmit a PUCCH, wherein:
the second DCI format includes a field indicating the first cell or the third cell,
the PUCCH provides acknowledgement information associated with the PDSCH reception, and
the PUCCH transmission is on the first cell or on the third cell based on the indication of the field.
15. A base station comprising a transceiver configured to:
transmit:
first information for first search space sets for transmissions of first physical downlink control channels (PDCCHs) on a first cell,
second information for second search space sets for transmissions of second PDCCHs on a second cell, wherein:
the transmissions of the first PDCCHs and of the second PDCCHs are in non-overlapping slots of the first cell and of the second cell, and
the first PDCCHs and the second PDCCHs provide respective downlink control information (DCI) formats for scheduling on the first cell, and
a first PDCCH from the first PDCCHs or from the second PDCCHs; and
receive a physical uplink shared channel (PUSCH) on the first cell, wherein the first PDCCH provides a first DCI format scheduling the PUSCH reception,
wherein the transmissions of the first PDCCHs are with different subcarrier spacing (SCS) than the transmissions of the second PDCCHs.
16. The base station of claim 15 , wherein:
the first PDCCH is from the second PDCCHs, and
the first cell is a primary cell.
17. The base station of claim 15 , wherein:
the first DCI format includes a carrier indicator field (CIF) having a value,
the value is zero when the first PDCCH is from the first PDCCHs, and
the value is a positive integer when the first PDCCH is from the second PDCCHs.
18. The base station of claim 15 , wherein the transceiver is further configured to transmit:
third information for a first downlink (DL) bandwidth part (BWP) on the second cell, and
fourth information for a second DL BWP on the second cell, wherein:
when an active DL BWP on the second cell is the first DL BWP, the first PDCCH is from the first PDCCHs or from the second PDCCHs, and
when an active DL BWP on the second cell is the second DL BWP, the first PDCCH is only from the first PDCCHs.
19. The base station of claim 15 , wherein the transceiver is further configured to transmit:
a second PDCCH from the first PDCCHs or from the second PDCCHs, and
a physical downlink shared channel (PDSCH) on the first cell, wherein the second PDCCH provides a second DCI format scheduling the PDSCH transmission.
20. The base station of claim 19 , wherein:
the second PDCCH transmission is in frequency resources within a first bandwidth,
the PDSCH transmission is in frequency resources within a second bandwidth, and
a maximum size of the first bandwidth is larger than a maximum size of the second bandwidth.