Transmission power control for an uplink control channel
A base station indicates, to a user equipment (UE) configured for operation with carrier aggregation, a resource for a transmission of a physical uplink control channel (PUCCH) format that conveys acknowledgement information from the UE, and the UE determines the resource and a transmission power for the PUCCH format.
1. A user equipment (UE), comprising:
a receiver configured to receive a number of physical downlink control channels (PDCCHs) that include downlink control information (DCI) formats scheduling receptions of physical downlink shared channels (PDSCHs) that include transport blocks (TBs); and
a transmitter configured to transmit a physical uplink control channel (PUCCH) that includes a number of hybrid automatic repeat request acknowledgement (HARQ-ACK) information bits in response to the receptions of the TBs in the PDSCHs, wherein a resource for the PUCCH transmission is determined from a field in a DCI format in a last PDCCH reception,
wherein the PDCCH receptions are ordered in an ascending order of respective starting reception times.
2. The UE of claim 1 , wherein
the field in the DCI format included in the last PDCCH reception indicates a resource from a set of resources, and
the set of resources is determined from the number of HARQ-ACK information bits.
3. The UE of claim 1 , wherein the PDCCH receptions are ordered in an ascending order of cell indexes of PDSCH receptions scheduled by the DCI formats.
4. The UE of claim 1 , wherein:
the field in a DCI format other than the DCI format in the last PDCCH reception indicates a first resource, and
the field in the DCI format in the last PDCCH reception indicates a second resource that is different from the first resource.
5. The UE of claim 4 , wherein the first resource is associated with use of a first PUCCH format and the second resource is associated with use of a second PUCCH format that is different from the first PUCCH format.
6. The UE of claim 4 , wherein:
the first resource is associated with a first maximum number of HARQ-ACK information bits and the second resource is associated with a second maximum number of HARQ-ACK information bits, and
the first maximum number is smaller than the second maximum number.
7. A base station, comprising:
a transmitter configured to transmit a number of physical downlink control channels (PDCCHs) that include downlink control information (DCI) formats scheduling transmissions of physical downlink shared channels (PDSCHs) that include transport blocks (TBs); and
a receiver configured to receive a physical uplink control channel (PUCCH) that includes a number of hybrid automatic repeat request acknowledgement (HARQ-ACK) information bits in response to the transmissions of the TBs in the PDSCHs, wherein a resource for the PUCCH reception is determined from a field in a DCI format in a last PDCCH transmission,
wherein the PDCCH transmission are ordered in an ascending order of respective starting transmission times.
8. The base station of claim 7 , wherein
the field in the DCI format included in the last PDCCH transmission indicates a resource from a set of resources, and
the set of resources is determined from the number of HARQ-ACK information bits.
9. The base station of claim 7 , wherein the PDCCH transmissions are ordered in an ascending order of cell indexes of PDSCH transmissions scheduled by the DCI formats.
10. The base station of claim 7 , wherein:
the field in a DCI format other than the DCI format in the last PDCCH transmission indicates a first resource, and
the field in the DCI format in the last PDCCH transmission indicates a second resource that is different from the first resource.
11. The base station of claim 10 , wherein the first resource is associated with use of a first PUCCH format and the second resource is associated with use of a second PUCCH format that is different from the first PUCCH format.
12. The base station of claim 10 , wherein:
the first resource is associated with a first maximum number of HARQ-ACK information bits and the second resource is associated with a second maximum number of HARQ-ACK information bits, and
the first maximum number is smaller than the second maximum number.
13. A method, comprising:
receiving a number of physical downlink control channels (PDCCHs) that include downlink control information (DCI) formats scheduling receptions of physical downlink shared channels (PDSCHs) that include transport blocks (TBs); and
transmitting a physical uplink control channel (PUCCH) that includes a number of hybrid automatic repeat request acknowledgement (HARQ-ACK) information bits in response to the receptions of the TBs in the PDSCHs, wherein a resource for the PUCCH transmission is determined from a field in a DCI format in a last PDCCH reception,
wherein the PDCCH receptions are ordered in an ascending order of respective starting reception times.
14. The method of claim 13 , wherein
the field in the DCI format included in the last PDCCH reception indicates a resource from a set of resources, and
the set of resources is determined from the number of HARQ-ACK information bits.
15. The method of claim 13 , wherein:
the field in a DCI format other than the DCI format in the last PDCCH reception indicates a first resource, and
the field in the DCI format in the last PDCCH reception indicates a second resource that is different from the first resource.
16. The method of claim 15 , wherein the first resource is associated with use of a first PUCCH format and the second resource is associated with use of a second PUCCH format that is different from the first PUCCH format.
17. The method of claim 15 , wherein:
the first resource is associated with a first maximum number of HARQ-ACK information bits and the second resource is associated with a second maximum number of HARQ-ACK information bits, and
the first maximum number is smaller than the second maximum number.