Semi-persistent scheduling management in new radio
Methods, systems, and devices for wireless communications are described. In one example, a method includes receiving signaling from a base station to activate a semi-persistent scheduling (SPS) configuration for transmission between the base station and the UE, and receiving a hybrid automatic repeat request (HARQ) timing for downlink transmissions based at least in part on the SPS configuration being activated. In another example, the method includes establishing a connection with a base station using a component carrier (CC), the CC having a plurality of bandwidth parts (BWPs), receiving signaling that indicates an SPS configuration or other types of pre-configured resources associated with at least a first BWP of the plurality of BWPs and transmitting or receiving using at least the first BWP according to the SPS configuration or other types of pre-configured resources associated with at least the first BWP.
1. A method for wireless communication at a user equipment (UE), comprising:
receiving signaling from a base station to activate a semi-persistent scheduling (SPS) configuration that is specific to a bandwidth part configured for the UE, the SPS configuration for transmission between the base station and the UE over the bandwidth part; and
determining a hybrid automatic repeat request (HARQ) timing for downlink transmissions based at least in part on the SPS configuration being activated and a HARQ timing value that is specific to the bandwidth part configured for the UE and indicated by radio resource control signaling.
2. The method of claim 1 , further comprising:
receiving a downlink transmission without a scheduling downlink control information (DCI); and
transmitting an acknowledgement (ACK)/non-acknowledgement (NACK) in response to the downlink transmission according to a timing latency indicated by the HARQ timing.
3. The method of claim 1 , further comprising:
receiving the HARQ timing via the radio resource control signaling from the base station.
4. The method of claim 3 , further comprising:
receiving signaling from the base station to activate a second SPS configuration for a second transmission between the base station and the UE; and
receiving a second HARQ timing via RRC signaling, the second HARQ timing associated with the second SPS configuration.
5. The method of claim 1 , wherein the HARQ timing is based at least in part on a capability of the UE.
6. The method of claim 5 , wherein the capability associated with the UE is based at least in part on a capability profile for the UE, wherein the capability profile indicates a minimum value of the HARQ timing supported by the UE.
7. The method of claim 1 , wherein the signaling to activate the SPS configuration comprises an activation downlink control information (DCI).
8. The method of claim 7 , further comprising:
receiving an indication of the HARQ timing via the activation DCI, the activation DCI including a physical downlink shared channel (PDSCH).
9. The method of claim 8 , wherein the HARQ timing is applied to the PDSCH with the activation DCI and subsequent transmissions of PDSCH without a DCI.
10. The method of claim 7 , further comprising:
receiving a second activation DCI that indicates a second HARQ timing, the second HARQ timing replacing the previously determined HARQ timing.
11. The method of claim 1 , wherein the HARQ timing is a function of at least one of a slot structure, or a bandwidth part switching procedure, or a combination thereof.
12. The method of claim 11 , wherein the slot structure comprises an uplink transmission opportunity for transmitting an acknowledgement (ACK)/non-acknowledgement (NACK) in response to a downlink transmission.
13. The method of claim 12 , wherein the slot structure is dynamically indicated by at least one slot-format-indicator (SFI).
14. An apparatus for wireless communication at a user equipment (UE), comprising:
a processor;
memory in electronic communication with the processor; and
instructions stored in the memory and executable by the processor to cause the apparatus to:
receive signaling from a base station to activate a semi-persistent scheduling (SPS) configuration that is specific to a bandwidth part configured for the UE, the SPS configuration for transmission between the base station and the UE over the bandwidth part; and
determine a hybrid automatic repeat request (HARQ) timing for downlink transmissions based at least in part on the SPS configuration being activated and a HARQ timing value that is specific to the bandwidth part configured for the UE and indicated by radio resource control signaling.
15. The apparatus of claim 14 , further comprising:
a receiver in electronic communication with the processor, wherein the instructions are further executable by the processor to cause the receiver to receive a downlink transmission without a scheduling downlink control information (DCI); and
a transmitter in electronic communication with the processor, wherein the instructions are further executable by the processor to cause the transmitter to transmit an acknowledgement (ACK)/non-acknowledgement (NACK) in response to the downlink transmission according to a timing latency indicated by the HARQ timing.
16. The apparatus of claim 14 , wherein the instructions are further executable by the processor to cause the apparatus to:
receive the HARQ timing via the radio resource control signaling from the base station.
17. The apparatus of claim 16 , wherein the instructions are further executable by the processor to cause the apparatus to:
receive signaling from the base station to activate a second SPS configuration for a second transmission between the base station and the UE; and
receive a second HARQ timing via RRC signaling, the second HARQ timing associated with the second SPS configuration.
18. The apparatus of claim 14 , wherein the HARQ timing is based at least in part on a capability of the UE.
19. The apparatus of claim 18 , wherein the capability associated with the UE is based at least in part on a capability profile for the UE, wherein the capability profile indicates a minimum value of the HARQ timing supported by the UE.
20. The apparatus of claim 14 , wherein the signaling to activate the SPS configuration comprises an activation downlink control information (DCI).
21. The apparatus of claim 20 , wherein the instructions are further executable by the processor to cause the apparatus to:
receive an indication of the HARQ timing via the activation DCI, the activation DCI including a physical downlink shared channel (PDSCH).
22. The apparatus of claim 21 , wherein the HARQ timing is applied to the PDSCH with the activation DCI and subsequent transmissions of PDSCH without a DCI.
23. The apparatus of claim 20 , wherein the instructions are further executable by the processor to cause the apparatus to:
receive a second activation DCI that indicates a second HARQ timing, the second HARQ timing replacing the previously determined HARQ timing.