Cancellation policy for radio resource control configured uplink transmissions
Methods, systems, and devices for wireless communication are described. The examples described herein provide a procedure at a user equipment (UE) for determining whether to transmit radio resource control (RRC) configured uplink signals to a base station based on detected slot format indications (SFIs) and/or undetected SFIs in multiple control channels. In particular, a UE may identify multiple control channels configured to include SFIs from a base station, and, as described herein, the UE may determine whether to transmit RRC configured uplink signals in a set of symbols based on a configuration of the set of symbols (e.g., uplink, downlink, or flexible) determined based on detected SFIs and/or undetected SFIs in the multiple control channels. The UE may be able to determine whether to transmit RRC configured uplink signals in a set of symbols based on any combination of detected SFIs and undetected SFIs.
1. A method for wireless communication at a user equipment (UE), comprising:
monitoring a plurality of control channels, wherein each control channel of the plurality of control channels is configured to include a slot format indication (SFI) for one or more slots;
detecting at least one SFI on at least one control channel of the plurality of control channels;
identifying a set of symbols in a slot to transmit radio resource control (RRC) configured uplink signals to a network entity;
determining whether the set of symbols in the slot is configured as uplink, flexible, or downlink based at least in part on the detected at least one SFI on the at least one control channel of the plurality of control channels;
transmitting the RRC configured uplink signals when it is determined that the set of symbols in the slot is configured as uplink; and
canceling transmission of the RRC configured uplink signals when it is determined that the set of symbols in the slot is configured as flexible or downlink.
2. The method of claim 1 , wherein detecting the SFI on at least one control channel of the plurality of control channels comprises:
identifying at least one control channel of the plurality of control channels where an SFI with a range that includes the set of symbols in the slot is detected.
3. The method of claim 2 , further comprising:
determining that the SFI is detected in the at least one control channel in advance of the set of symbols in the slot by a threshold amount of time; and
determining whether the set of symbols in the slot is configured as uplink, flexible, or downlink based at least in part on the SFI.
4. The method of claim 2 , further comprising:
determining that the SFI is detected in the at least one control channel within a threshold amount of time prior to the set of symbols in the slot; and
determining whether the set of symbols in the slot is configured as uplink, flexible, or downlink independently of the SFI.
5. The method of claim 1 , wherein detecting the SFI on at least one control channel of the plurality of control channels comprises:
identifying that at least one SFI is detected in at least one of the plurality of control channels, wherein the detected at least one SFI fails to cover a range that includes the set of symbols, and that at least one SFI is undetected in at least one of the plurality of control channels;
determining that the slot is configured as flexible based at least in part on the identifying; and
canceling transmission of the RRC configured uplink signals based at least in part on the determination.
6. The method of claim 1 , wherein detecting the SFI on at least one control channel of the plurality of control channels comprises:
identifying that at least one SFI is detected in at least one of the plurality of control channels, wherein the detected at least one SFI fails to cover a range that includes the set of symbols, and that no SFIs are undetected in the plurality of control channels;
determining that the slot is configured as uplink based at least in part on the identifying; and
transmitting the RRC configured uplink signals based at least in part on the determination.
7. The method of claim 1 , wherein each control channel of the plurality of control channels is configured to include an SFI indicating slot formats for one or more slots with a range that potentially includes the set of symbols in the slot.
8. The method of claim 7 , wherein the plurality of control channels is identified based at least in part on a maximum range of SFIs.
9. The method of claim 8 , wherein the maximum range of SFIs is determined based at least in part on a look-up table that indicates a relationship between SFIs and slot formats for ranges of slots.
10. The method of claim 1 , wherein the RRC configured uplink signals comprise a scheduling request (SR), sounding reference signals (SRSs), uplink signals scheduled using semi-persistent scheduling (SPS), or a combination thereof.
11. An apparatus for wireless communication at a user equipment (UE), comprising:
a memory; and
a processor coupled to the memory and configured to:
monitor a plurality of control channels, wherein each control channel of the plurality of control channels is configured to include a slot format indication (SFI) for one or more slots;
detect at least one SFI on at least one control channel of the plurality of control channels;
identify a set of symbols in a slot to transmit radio resource control (RRC) configured uplink signals to a network entity;
determine whether the set of symbols in the slot is configured as uplink, flexible, or downlink based at least in part on the detected at least one SFI on the at least one control channel of the plurality of control channels;
transmit the RRC configured uplink signals when it is determined that the set of symbols in the slot is configured as uplink; and
cancel transmission of the RRC configured uplink signals when it is determined that the set of symbols in the slot is configured as flexible or downlink.
12. The apparatus of claim 11 , wherein the processor is further configured to:
identify at least one control channel of the plurality of control channels where an SFI with a range that includes the set of symbols in the slot is detected.
13. The apparatus of claim 12 , wherein the processor is further configured to:
determine that the SFI is detected in the at least one control channel in advance of the set of symbols in the slot by a threshold amount of time; and
determine whether the set of symbols in the slot is configured as uplink, flexible, or downlink based at least in part on the SFI.
14. The apparatus of claim 12 , wherein the processor is further configured to:
determine that the SFI is detected in the at least one control channel within a threshold amount of time prior to the set of symbols in the slot; and
determine whether the set of symbols in the slot is configured as uplink, flexible, or downlink independently of the SFI.
15. The apparatus of claim 11 , wherein the processor is further configured to:
identify that at least one SFI is detected in at least one of the plurality of control channels, wherein the detected at least one SFI fails to cover a range that includes the set of symbols, and that at least one SFI is undetected in at least one of the plurality of control channels;
determine that the slot is configured as flexible based at least in part on the identifying; and
cancel transmission of the RRC configured uplink signals based at least in part on the determination.
16. The apparatus of claim 11 , wherein the processor is further configured to:
identify that at least one SFI is detected in at least one of the plurality of control channels, wherein the detected at least one SFI fails to cover a range that includes the set of symbols, and that no SFIs are undetected in the plurality of control channels;
determine that the slot is configured as uplink based at least in part on the identifying; and
transmit the RRC configured uplink signals based at least in part on the determination.
17. The apparatus of claim 11 , wherein each control channel of the plurality of control channels is configured to include an SFI indicating slot formats for one or more slots with a range that potentially includes the set of symbols in the slot.
18. The apparatus of claim 17 , wherein the plurality of control channels is identified based at least in part on a maximum range of SFIs.
19. The apparatus of claim 18 , wherein the maximum range of SFIs is determined based at least in part on a look-up table that indicates a relationship between SFIs and slot formats for ranges of slots.
20. The apparatus of claim 11 , wherein the RRC configured uplink signals comprise a scheduling request (SR), sounding reference signals (SRSs), uplink signals scheduled using semi-persistent scheduling (SPS), or a combination thereof.
21. An apparatus for wireless communication at a user equipment (UE), comprising:
means for monitoring a plurality of control channels, wherein each control channel of the plurality of control channels is configured to include a slot format indication (SFI) for one or more slots;
means for detecting at least one SFI on at least one control channel of the plurality of control channels;
means for identifying a set of symbols in a slot to transmit radio resource control (RRC) configured uplink signals to a network entity;
means for determining whether the set of symbols in the slot is configured as uplink, flexible, or downlink based at least in part on the detected at least one SFI on the at least one control channel of the plurality of control channels;
means for transmitting the RRC configured uplink signals when it is determined that the set of symbols in the slot is configured as uplink; and
means for canceling transmission of the RRC configured uplink signals when it is determined that the set of symbols in the slot is configured as flexible or downlink.
22. The apparatus of claim 21 , further comprising:
means for identifying at least one control channel of the plurality of control channels where an SFI with a range that includes the set of symbols in the slot is detected.
23. The apparatus of claim 22 , further comprising:
means for determining that the SFI is detected in the at least one control channel in advance of the set of symbols in the slot by a threshold amount of time; and
means for determining whether the set of symbols in the slot is configured as uplink, flexible, or downlink based at least in part on the SFI.
24. The apparatus of claim 22 , further comprising:
means for determining that the SFI is detected in the at least one control channel within a threshold amount of time prior to the set of symbols in the slot; and
means for determining whether the set of symbols in the slot is configured as uplink, flexible, or downlink independently of the SFI.
25. The apparatus of claim 22 , wherein each control channel of the plurality of control channels is configured to include an SFI indicating slot formats for one or more slots with a range that potentially includes the set of symbols in the slot.
26. A non-transitory computer-readable medium storing code for wireless communication, the code comprising instructions executable by a processor to:
monitor a plurality of control channels, wherein each control channel of the plurality of control channels is configured to include a slot format indication (SFI) for one or more slots;
detect at least one SFI on at least one control channel of the plurality of control channels;
identify a set of symbols in a slot to transmit radio resource control (RRC) configured uplink signals to a network entity;
determine whether the set of symbols in the slot is configured as uplink, flexible, or downlink based at least in part on the detected at least one SFI on the at least one control channel of the plurality of control channels;
transmit the RRC configured uplink signals when it is determined that the set of symbols in the slot is configured as uplink; and
cancel transmission of the RRC configured uplink signals when it is determined that the set of symbols in the slot is configured as flexible or downlink.
27. The non-transitory computer-readable medium of claim 26 , wherein the instructions are further executable by the processor to:
identify at least one control channel of the plurality of control channels where an SFI with a range that includes the set of symbols in the slot is detected.
28. The non-transitory computer-readable medium of claim 27 , wherein the instructions are further executable by the processor to:
determine that the SFI is detected in the at least one control channel in advance of the set of symbols in the slot by a threshold amount of time; and
determine whether the set of symbols in the slot is configured as uplink, flexible, or downlink based at least in part on the SFI.
29. The non-transitory computer-readable medium of claim 27 , wherein the instructions are further executable by the processor to:
determine that the SFI is detected in the at least one control channel within a threshold amount of time prior to the set of symbols in the slot; and
determine whether the set of symbols in the slot is configured as uplink, flexible, or downlink independently of the SFI.
30. The non-transitory computer-readable medium of claim 26 , wherein each control channel of the plurality of control channels is configured to include an SFI indicating slot formats for one or more slots with a range that potentially includes the set of symbols in the slot.