Latency reduction for flexible duplex communication systems
Methods and apparatuses for transmitting and receiving a physical uplink control channel (PUCCH) or a physical downlink control channel (PDCCH). A method of a UE includes receiving: a configuration for first PUCCH resources, or for first search space sets, on a first cell and a configuration for second PUCCH resources, or for second search space sets, on a second cell. The method further includes determining: a first PUCCH resource, or the first search space sets, on the first cell; a second PUCCH resource, or the second search space sets, on the second cell; and a condition. The method further includes transmitting the PUCCH using the first PUCCH resource, or receiving the PDCCH based on the first search space sets, when the condition is satisfied, and transmitting the PUCCH using the second PUCCH resource, or receiving the PDCCH based on the second search space sets, when the condition is not satisfied.
1. A method for transmitting a physical uplink control channel (PUCCH), the method comprising:
receiving:
a configuration for first one or more PUCCH resources on a first cell,
a configuration for second one or more PUCCH resources on a second cell, and
a downlink control information (DCI) format that includes a field with a value indicating the first cell or the second cell, wherein the first cell and the second cell are in a same group of cells with associated control information provided by a same PUCCH;
determining:
a first PUCCH resource from the first one or more PUCCH resources on the first cell when the value indicates the first cell,
a second PUCCH resource from the second one or more PUCCH resources on the second cell when the value indicates the second cell; and
transmitting the PUCCH:
using the first PUCCH resource when the value indicates the first cell, and
using the second PUCCH resource when the value indicates the second cell.
2. The method of claim 1 , wherein the first cell is a primary cell and the second cell is a secondary cell.
3. The method of claim 1 , wherein all symbols of the first PUCCH resource and of the second PUCCH resource are flexible symbols or uplink symbols.
4. The method of claim 1 , further comprising:
transmitting the PUCCH with a number of repetitions,
a first repetition of the PUCCH uses the first PUCCH resource, and
a second repetition of the PUCCH uses the second PUCCH resource.
5. The method of claim 1 , further comprising:
receiving a downlink control information (DCI) format that includes a first field providing a first transmit power control (TPC) command values and a second field providing a second TPC command value;
determining a first power adjustment based on the first TPC command value;
determining a second power adjustment based on the second TPC command value;
determining one of:
a power based on the first power adjustment when the value indicates the first cell, or
a power based on the second power adjustment when the value indicates the second cell; and
transmitting the PUCCH with the determined power.
6. A user equipment (UE) comprising:
a transceiver configured to receive:
a configuration for first one or more physical uplink control channel (PUCCH) resources on a first cell,
a configuration for second one or more PUCCH resources on a second cell, and
a downlink control information (DCI) format that includes a field with a value indicating the first cell or the second cell, wherein the first cell and the second cell are in a same group of cells with associated control information provided by a same PUCCH; and
a processor configured to determine:
a first PUCCH resource from the first one or more PUCCH resources on the first cell when the value indicates the first cell,
a second PUCCH resource from the second one or more PUCCH resources on the second cell when the value indicates the second cell;
wherein the transceiver is further configured to transmit the PUCCH:
using the first PUCCH resource when the value indicates the first cell, and
using the second PUCCH resource when the value indicates the second cell.
7. The UE of claim 6 , wherein the first cell is a primary cell and the second cell is a secondary cell.
8. The UE of claim 6 , wherein all symbols of the first PUCCH resource and of the second PUCCH resource are flexible symbols or uplink symbols.
9. The UE of claim 6 , wherein:
the transceiver is further configured to transmit the PUCCH with a number of repetitions,
a first repetition of the PUCCH uses the first PUCCH resource, and
a second repetition of the PUCCH uses the second PUCCH resource.
10. The UE of claim 6 , wherein:
the transceiver is further configured to receive a downlink control information (DCI) format that includes a first field providing a first transmit power control (TPC) command value and a second field providing a second TPC command value;
the processor is further configured to:
determine a first power adjustment based on a sum of the TPC command value, determine a second power adjustment based on the second TPC command value, and
determine one of:
a power based on the first power adjustment when the value indicates the first cell, or
a power based on the second power adjustment when the value indicates the second cell; and
the transceiver is further configured to transmit the PUCCH with the determined power.
11. A base station comprising:
a transceiver configured to transmit:
a configuration for first one or more physical uplink control channel (PUCCH) resources on a first cell,
a configuration for second one or more PUCCH resources on a second cell, and
a downlink control information (DCI) format that includes a field with a value indicating the first cell or the second cell, wherein the first cell and the second cell are in a same group of cells with associated control information provided by a same PUCCH; and
a processor configured to determine:
a first PUCCH resource from the first one or more PUCCH resources on the first cell when the value indicates the first cell,
a second PUCCH resource from the second one or more PUCCH resources on the second cell when the value indicates the second cell,
wherein the transceiver is further configured to receive the PUCCH:
using the first PUCCH resource when the value indicates the first cell, and
using the second PUCCH resource when the value indicates the second cell.
12. The base station of claim 11 , wherein the first cell is a primary cell and the second cell is a secondary cell.
13. The base station of claim 11 , wherein all symbols of the first PUCCH resource and of the second PUCCH resource are flexible symbols or uplink symbols.
14. The base station of claim 11 , wherein:
the transceiver is further configured to receive the PUCCH with a number of repetitions,
a first repetition of the PUCCH uses the first PUCCH resource, and
a second repetition of the PUCCH uses the second PUCCH resource.