Carrier aggregation under different subframe structures in new radio
A method and apparatus for downlink and uplink control management of component carriers during carrier aggregation in a new radio wireless communication system is disclosed. For example, the method and apparatus include receiving, at a user equipment (UE), a slot format indicator in at least one slot of at least one component carrier of a plurality of component carriers from a network entity, where the at least one component carrier includes a group common Physical Downlink Control Channel (PDCCH), the slot format indicator within the group common PDCCH indicating at least slot structure information for one or more other component carriers from the plurality of component carriers; and communicating, with the network entity, using the at least slot structure information for the one more other component carriers.
1. A method of wireless communication, comprising:
receiving, at a user equipment (UE), a slot format indicator in at least one slot of at least one component carrier of a plurality of component carriers from a network entity, where the at least one component carrier includes a group common Physical Downlink Control Channel (PDCCH), the slot format indicator conveyed by the group common PDCCH indicating slot structure information for one or more other component carriers from the plurality of component carriers, wherein the at least one component carrier provides uplink feedback for the one or more other component carriers scheduled based on an association between the slot format indicator and a corresponding Downlink Control Information (DCI) format that configures hybrid automatic repeat request (HARQ) acknowledgment reporting for cross-carrier scheduling; and
communicating, with the network entity, using the slot structure information for the one or more other component carriers.
2. The method of claim 1 , wherein a slot duration corresponding to the at least one component carrier is shorter than a slot duration corresponding to the one or more other component carriers.
3. The method of claim 1 , wherein a slot duration corresponding to the at least one component carrier is longer than a slot duration corresponding to the one or more other component carriers.
4. The method of claim 1 , further compromising receiving a second PDCCH on a second component carrier from the plurality of component carriers, where the PDCCH conveys a slot format indicator for at least one slot of the second component carrier.
5. The method of claim 1 , wherein the slot format indicator further indicates a slot structure information for the at least one component carrier carrying the slot format indicator.
6. The method of claim 1 , further comprising receiving, at the UE, a second slot format indicator in at least a second slot of the at least one component carrier, the second slot format indicator indicating a slot structure information for the at least one component carrier.
7. The method of claim 1 , wherein the slot format indicator further indicates a respective slot structure for multiple slots of the one or more other component carriers and the at least one component carrier.
8. The method of claim 1 , wherein the at least one component carrier and the one or more other component carriers have different numerologies.
9. The method of claim 1 , further comprising:
receiving, at the UE, an indication to trigger Channel State Information (CSI) measurements for the one or more other component carriers, the indication included within DCI received in a slot of the at least one component carrier;
determining a measurement configuration for performing the CSI measurements in the one or more other component carriers;
performing the CSI measurements in the one or more other component carriers based on the measurement configuration;
transmitting, to the network entity, the CSI measurements for the one or more other component carriers.
10. The method of claim 1 , further comprising:
generating, at the UE, Uplink Control Information (UCI) in the at least one component carrier, the UCI including uplink information for the one or more other component carriers; and
transmitting, to a network entity, the UCI in at least one slot of the at least one component carrier.
11. The method of claim 10 , wherein the UCI corresponds to at least one of an acknowledgement signal, a negative acknowledgement signal, a scheduling request, a Channel Quality Indicator (CQI), or a Channel State Information (CSI).
12. The method of claim 1 , wherein transmitting the UCI further comprises transmitting the UCI in a Physical Uplink Control Channel (PUCCH), where the UCI can be repeated or be transmitted in a subset of slots.
13. The method of claim 1 , further comprising:
determining, at the UE, a timing advance offset associated with each of the plurality of component carriers.
14. The method of claim 13 , wherein the determination for a component carrier is based on a numerology of the component carrier.
15. The method of claim 13 , wherein the plurality of component carriers are configured with different numerologies; and further comprising:
utilizing one of a primary cell or a primary secondary cell as a reference to determine the timing advance offset for another component carrier.
16. An apparatus, comprising:
a memory; and
a processor in communication with the memory, wherein the processor is configured to:
receive, at a user equipment (UE), a slot format indicator in at least one slot of at least one component carrier of a plurality of component carriers from a network entity, where the at least one component carrier includes a group common Physical Downlink Control Channel (PDCCH), the slot format indicator conveyed by the group common PDCCH indicating slot structure information for one or more other component carriers from the plurality of component carriers, wherein the at least one component carrier provides uplink feedback for the one or more other component carriers scheduled based on an association between the slot format indicator and a corresponding Downlink Control Information (DCI) format that configures hybrid automatic repeat request (HARQ) acknowledgment reporting for cross-carrier scheduling; and
communicate, with the network entity, using the slot structure information for the one or more other component carriers.
17. A method of wireless communication, comprising:
generating, at a network entity, a slot format indicator for at least one component carrier of a plurality of component carriers, where the at least one component carrier includes a group common Physical Downlink Control Channel (PDCCH), the slot format indicator conveyed by the group common PDCCH indicating slot structure information for one or more other component carriers from the plurality of component carriers, wherein the at least one component carrier provides uplink feedback for the one or more other component carriers scheduled based on an association between the slot format indicator and a corresponding Downlink Control Information (DCI) format that configures hybrid automatic repeat request (HARQ) acknowledgment reporting for cross-carrier scheduling;
transmitting, by the network entity, the slot format indicator in at least one slot of the at least one component carrier to a user equipment (UE); and
communicating, with the UE, using the slot structure information for the one or more other component carriers.
18. The method of claim 17 , wherein a slot duration corresponding to the at least one component carrier is shorter than a slot duration corresponding to the one or more other component carriers.
19. The method of claim 17 , wherein a slot duration corresponding to the at least one component carrier is longer than a slot duration corresponding to the one or more other component carriers.
20. The method of claim 17 , further compromising transmitting a second PDCCH on a second component carrier from the plurality of component carriers, where the PDCCH conveys a slot format indicator for at least one slot of the second component carrier.