Carrier aggregation with variable transmission durations
A method of a user equipment (UE) for constructing a hybrid automatic repeat request acknowledgement (HARQ-ACK) codebook. The method comprises receiving physical downlink control channels (PDCCHs) that convey respective downlink control information (DCI) formats, wherein each DCI format includes a counter field and a slot offset field, receiving physical downlink data channels (PDSCHs) that convey data transport blocks, detecting the DCI formats configuring the received PDSCHs, determining locations for HARQ-ACK bits in a HARQ-ACK codebook based on a value of the slot offset field and a value of the counter field in each detected DCI format, determining a time unit for transmission of the HARQ-ACK codebook based on a value of the slot offset field in each detected DCI format, and transmitting the HARQ-ACK codebook.
1. A method comprising:
receiving a first physical downlink control channel (PDCCH) and a second PDCCH, wherein:
the first PDCCH includes a first downlink control information (DCI) format that schedules a reception of a first physical downlink data channel (PDSCH) that includes first one or more transport blocks,
the first DCI format includes a first slot offset field having a first value,
the second PDCCH includes a second DCI format that schedules a reception of a second PDSCH that includes second one or more transport blocks,
the second DCI format includes a second slot offset field having a second value, and
a slot for the reception of the second PDSCH is after a slot for the reception of the first PDSCH;
determining a first slot, from the first value of the first slot offset field, for a transmission of a first physical uplink control channel (PUCCH) with a first hybrid automatic repeat request acknowledgement (HARQ-ACK) codebook that includes first HARQ-ACK information bits corresponding to the first one or more transport blocks;
determining a second slot, from the second value of the second slot offset field, for a transmission of a second PUCCH with a second HARQ-ACK codebook that includes second HARQ-ACK information bits corresponding to the second one or more transport blocks; and
canceling the transmission of the second PUCCH when the second slot is before the first slot.
2. The method of claim 1 , further comprising:
receiving the first PDSCH; and
transmitting the first PUCCH.
3. The method of claim 1 , further comprising:
receiving the first PDSCH and the second PDSCH when the second slot is after the first slot; and
transmitting the first PUCCH and the second PUCCH.
4. The method of claim 1 , further comprising:
receiving the first PDSCH within a slot having a first duration, and
receiving the second PDSCH within a slot having a second duration.
5. The method of claim 1 , further comprising:
determining the first slot as n+k 1 , wherein, for slots of PUCCH transmissions:
n is a slot number for the reception of the first PDSCH, and
k 1 is the first value of the first slot offset field.
6. The method of claim 1 , further comprising:
receiving a configuration for a slot offset value; and
determining the first slot as n+k 0 +k 1 , wherein, for slots of PUCCH transmissions:
n is a slot number for the reception of the first PDSCH,
k 0 is the slot offset value, and
k 1 is the first value of the first slot offset field.
7. The method of claim 1 , further comprising:
determining a location for the first HARQ-ACK information bits in the first HARQ-ACK codebook based on:
a start time of the first PDCCH reception,
the first value of the first slot offset field, and
a value of a counter downlink assignment index (DAI) field in the first DCI format.
8. The method of claim 1 , further comprising:
determining a size for the first HARQ-ACK codebook based on a value of a total DAI field included in the first DCI format, wherein the reception of the first PDCCH is a last PDCCH reception in time that includes a DCI format with a slot offset field value resulting to a determination of the first slot for a transmission of a corresponding PUCCH.
9. A user equipment (UE) comprising:
a receiver configured to receive a first physical downlink control channel (PDCCH) and a second PDCCH, wherein:
the first PDCCH includes a first downlink control information (DCI) format that schedules a reception of a first physical downlink data channel (PDSCH) that includes first one or more transport blocks,
the first DCI format includes a first slot offset field having a first value,
the second PDCCH includes a second DCI format that schedules a reception of a second PDSCH that includes second one or more transport blocks,
the second DCI format includes a second slot offset field having a second value, and
a slot for the reception of the second PDSCH is after a slot for the reception of the first PDSCH; and
a processor operably connected to the receiver, the processor configured to:
determine a first slot, from the first value of the first slot offset field, for a transmission of a first physical uplink control channel (PUCCH) with a first hybrid automatic repeat request acknowledgement (HARQ-ACK) codebook that includes first HARQ-ACK information bits corresponding to the first one or more transport blocks;
determine a second slot, from the second value of the second slot offset field, for a transmission of a second PUCCH with a second HARQ-ACK codebook that includes second HARQ-ACK information bits corresponding to the second one or more transport blocks; and
cancel the transmission of the second PUCCH when the second slot is before the first slot.
10. The UE of claim 9 , wherein the receiver is further configured to receive the first PDSCH and the second PDSCH when the second slot is after the first slot.
11. The UE of claim 9 , further comprising:
a transmitter configured to transmit the first PUCCH and the second PUCCH.
12. The UE of claim 9 , wherein:
the reception of the first PDSCH is within a slot having a first duration, and
the reception of the second PDSCH is within a slot having a second duration.
13. The UE of claim 9 , wherein:
the processor is further configured to determine the first slot as n+k 1 , wherein, for slots of PUCCH transmissions:
n is a slot number for the reception of the first PDSCH, and
k 1 is the first value of the first slot offset field.
14. The UE of claim 9 , wherein:
the receiver is further configured to receive a configuration for a slot offset value; and
the processor is further configured to determine the first slot as n+k 0 +k 1 , wherein, for slots of PUCCH transmissions:
n is a slot number for the reception of the first PDSCH,
k 0 is the slot offset value, and
k 1 is the first value of the first slot offset field.
15. The UE of claim 9 , wherein:
the processor is further configured to determine a location for the first HARQ-ACK information bits in the first HARQ-ACK codebook based on:
a starting time of the first PDCCH reception,
the first value of the first slot offset field, and
a value of a counter downlink assignment index (DAI) field in the first DCI format.
16. The UE of claim 9 , wherein the processor is further configured to determine a size for the first HARQ-ACK codebook based on a value of a total DAI field included in the first DCI format, wherein the reception of the first PDCCH is a last PDCCH reception in time that includes a DCI format with a slot offset field value resulting to a determination of the first slot for a transmission of a corresponding PUCCH.
17. A base station comprising:
a transmitter configured to transmit a first physical downlink control channel (PDCCH) and a second PDCCH, wherein:
the first PDCCH includes a first downlink control information (DCI) format that schedules a transmission of a first physical downlink data channel (PDSCH) that includes first one or more transport blocks,
the first DCI format includes a first slot offset field having a first value,
the second PDCCH includes a second DCI format that schedules a transmission of a second PDSCH that includes second one or more transport blocks,
the second DCI format includes a second slot offset field having a second value, and
a slot for the transmission of the second PDSCH is after a slot for the transmission of the first PDSCH; and
a processor operably connected to the transmitter, the processor configured to:
determine a first slot, from the first value of the first slot offset field, for a reception of a first physical uplink control channel (PUCCH) with a first hybrid automatic repeat request acknowledgement (HARQ-ACK) codebook that includes first HARQ-ACK information bits corresponding to the first one or more transport blocks;
determine a second slot, from the second value of the second slot offset field, for a reception of a second PUCCH with a second HARQ-ACK codebook that includes second HARQ-ACK information bits corresponding to the second one or more transport blocks; and
cancel the reception of the second PUCCH when the second slot is before the first slot.
18. The base station of claim 17 , wherein:
the processor is further configured to determine the first slot as n+k 1 , wherein, for slots of PUCCH receptions:
n is a slot number for the transmission of the first PDSCH, and
k 1 is the first value of the first slot offset field.
19. The base station of claim 17 , wherein:
the transmitter is further configured to transmit a configuration for a slot offset value; and
the processor is further configured to determine the first slot as n+k 0 +k 1 , wherein, for slots of PUCCH receptions:
n is a slot number for the transmission of the first PDSCH,
k 0 is the slot offset value, and
k 1 is the first value of the first slot offset field.
20. The base station of claim 17 , wherein:
the processor is further configured to determine a location for the first HARQ-ACK information bits in the first HARQ-ACK codebook based on:
a starting time of the first PDCCH transmission,
the first value of the first slot offset field, and
a value of a counter downlink assignment index (DAI) field in the first DCI format.