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 slot offset value k 0 by higher layer signaling, and
a physical downlink control channel (PDCCH) that provides a downlink control information (DCI) format, wherein the DCI format:
schedules a reception of a physical downlink shared channel (PDSCH) that provides a transport block (TB), and
includes a field indicating a second slot offset value k 1 ;
determining a first slot for transmission of a physical uplink control channel (PUCCH) with hybrid automatic repeat request acknowledgement (HARQ-ACK) information for a correct or incorrect decoding outcome of the TB, wherein the first slot is k 0 +k 1 slots after a slot of the PDSCH reception; and
transmitting the PUCCH in the first slot.
2. The method of claim 1 , further comprising:
determining a HARQ-ACK codebook that includes the HARQ-ACK information, wherein:
the HARQ-ACK codebook depends on the second slot offset value k 1 and does not depend on the first slot offset value k 0 , and
the HARQ-ACK codebook is included in the PUCCH transmission.
3. The method of claim 1 , further comprising:
receiving higher layer signaling that configures the field indicating the second slot offset value k 1 .
4. The method of claim 1 , further comprising:
transmitting a capability for a maximum number of HARQ processes, wherein the TB is associated with a HARQ process from the maximum number of HARQ processes.
5. The method of claim 1 , further comprising:
determining a HARQ-ACK codebook that includes the HARQ-ACK information, wherein:
a size of the HARQ-ACK codebook is predetermined based on a predetermined maximum number of PDSCH receptions with respective HARQ-ACK information in the HARQ-ACK codebook, and
the HARQ-ACK codebook is included in the PUCCH.
6. The method of claim 5 , wherein the predetermined maximum number of PDSCH receptions is predetermined per cell of PDSCH receptions.
7. The method of claim 5 , wherein HARQ-ACK information for a first PDSCH reception from a number of PDSCH receptions has a negative acknowledgement (NACK) value when a DCI format scheduling the first PDSCH reception is not received.
8. A user equipment (UE) comprising:
a transceiver configured to receive:
a first slot offset value k 0 by higher layer signaling, and
a physical downlink control channel (PDCCH) that provides a downlink control information (DCI) format, wherein the DCI format:
schedules a reception of a physical downlink shared channel (PDSCH) that provides a transport block (TB), and
includes a field indicating a second slot offset value k 1 ; and
a processor operably coupled to the transceiver, the processor configured to determine a first slot for transmission of a physical uplink control channel (PUCCH) with hybrid automatic repeat request acknowledgement (HARQ-ACK) information for a correct or incorrect decoding outcome of the TB, wherein the first slot is k 0 +k 1 slots after a slot of the PDSCH reception,
the transceiver is further configured to transmit the PUCCH in the first slot.
9. The UE of claim 8 , wherein:
the processor is further configured to determine a HARQ-ACK codebook that includes the HARQ-ACK information,
the HARQ-ACK codebook depends on the second slot offset value k 1 and does not depend on the first slot offset value k 0 , and
the HARQ-ACK codebook is included in the PUCCH transmission.
10. The UE of claim 8 , wherein the transceiver is further configured to receive higher layer signaling that configures the field indicating the second slot offset value k 1 .
11. The UE of claim 8 , wherein:
the transceiver is further configured to transmit a capability for a maximum number of HARQ processes, and
the TB is associated with a HARQ process from the maximum number of HARQ processes.
12. The UE of claim 8 , wherein:
the processor is further configured to determine a HARQ-ACK codebook that includes the HARQ-ACK information,
a size of the HARQ-ACK codebook is predetermined based on a predetermined maximum number of PDSCH receptions with respective HARQ-ACK information in the HARQ-ACK codebook, and
the HARQ-ACK codebook is included in the PUCCH.
13. The UE of claim 12 , wherein the predetermined maximum number of PDSCH receptions is predetermined per cell of PDSCH receptions.
14. The UE of claim 12 , wherein HARQ-ACK information for a first PDSCH reception from a number of PDSCH receptions has a negative acknowledgement (NACK) value when a respective DCI format scheduling the first PDSCH reception is not received.
15. A base station comprising:
a transceiver configured to transmit:
a first slot offset value k 0 by higher layer signaling, and
a physical downlink control channel (PDCCH) that provides a downlink control information (DCI) format, wherein the DCI format:
schedules a reception of a physical downlink shared channel (PDSCH) that provides a transport block (TB), and
includes a field indicating a second slot offset value k 1 ; and
a processor operably coupled to the transceiver, the processor configured to determine a first slot for reception of a physical uplink control channel (PUCCH) with hybrid automatic repeat request acknowledgement (HARQ-ACK) information for a correct or incorrect decoding outcome of the TB based on the first slot offset value k 0 and the second slot offset value k 1 ; and
wherein the transceiver is further configured to receive the PUCCH in the first slot.
16. The base station of claim 15 , wherein:
the processor is further configured to determine a HARQ-ACK codebook that includes the HARQ-ACK information,
the HARQ-ACK codebook depends on the second slot offset value k 1 and does not depend on the first slot offset value k 0 , and
the HARQ-ACK codebook is included in the PUCCH reception.
17. The base station of claim 15 , wherein the transceiver is further configured to transmit higher layer signaling that configures the field indicating the second slot offset value k 1 .
18. The base station of claim 15 , wherein:
the transceiver is further configured to receive a capability for a maximum number of HARQ processes, and
the TB is associated with a HARQ process from the maximum number of HARQ processes.
19. The base station of claim 15 , wherein:
the processor is further configured to determine a HARQ-ACK codebook that includes the HARQ-ACK information,
a size of the HARQ-ACK codebook is predetermined based on a predetermined maximum number of PDSCH transmissions with respective HARQ-ACK information in the HARQ-ACK codebook, and
the HARQ-ACK codebook is included in the PUCCH.
20. The base station of claim 19 , wherein the predetermined maximum number of PDSCH transmissions is predetermined per cell of PDSCH transmissions.