Multi-level slot format indicator

1. A method for wireless communication, comprising:

receiving a first slot format indicator (SFI) during a first monitoring period for a set of slots associated with the first monitoring period;

receiving a second SFI during a second monitoring period that is shorter in duration than the first monitoring period and occurs within the first monitoring period, the second SFI comprising an indication of slot formats for a subset of the slots associated with the second monitoring period; and

performing wireless communications over the subset of slots based at least in part on the first SFI and the second SFI.

2. The method of claim 1 , wherein performing the wireless communications comprises:

identifying a communication direction for at least a portion of the symbols in the subset of slots based at least in part on the first SFI and the second SFI; and

performing the wireless communications over the subset of slots based at least in part on the identified communication direction.

3. The method of claim 1 , further comprising:

determining that the first SFI indicates a flexible communication direction for one or more symbols within the subset of slots; and

identifying a communication direction for each of the one or more symbols based at least in part on the second SFI.

4. The method of claim 1 , wherein the first SFI comprises control information identifying and indicating configuration information for the subset of slots, the identifying configuration information comprising identifying a slot format for the subset of slots based at least in part on the second SFI.

5. The method of claim 4 , wherein the control information comprises one or more of an indication of random access channel (RACH) resources, a frame format indication, or a combination thereof.

6. The method of claim 1 , further comprising:

receiving a third SFI during a third monitoring period that is shorter in duration than the second monitoring period and occurs with the second monitoring period, the third SFI comprising an indication of a slot format for a slot associated with the third monitoring period.

7. The method of claim 6 , wherein the first monitoring period is for a discovery reference signal (DRS) measurement timing configuration (DMTC) window, the second monitoring period is for a transmission opportunity (TxOP) occurring within the DMTC window, and the third monitoring period is for the slot occurring within the TxOP.

8. The method of claim 1 , further comprising:

receiving the first SFI in a first downlink control indicator (DCI) field; and

receiving the second SFI in a second DCI field that is different from the first DCI field.

9. The method of claim 1 , further comprising:

receiving the first SFI and the second SFI in a common downlink control indicator (DCI) field; and

performing at least one of joint interpretation or deconcatenation on the common DCI field to determine the first SFI, the second SFI, or a combination thereof.

10. The method of claim 1 , further comprising:

receiving a configuration message indicating the first monitoring period and the second monitoring period.

11. The method of claim 1 , wherein the first monitoring period is for a transmission opportunity (TxOP) and the second monitoring period is for the one or more slots occurring within the TxOP.

12. The method of claim 1 , wherein the subset of slots comprises one slot or more than one slot.

13. A method for wireless communication, comprising:

transmitting a first slot format indicator (SFI) during a first monitoring period for a set of slots associated with the first monitoring period;

transmitting a second SFI during a second monitoring period that is shorter in duration than the first monitoring period and occurs within the first monitoring period, the second SFI comprising an indication of slot formats for a subset of the slots associated with the second monitoring period; and

performing wireless communications over the subset of slots based at least in part on the first SFI and the second SFI.

14. The method of claim 13 , wherein performing the wireless communications comprises:

identifying a communication direction for at least a portion of the symbols in the subset of slots based at least in part on the first SFI and the second SFI; and

performing the wireless communications over the subset of slots based at least in part on the identified communication direction.

15. The method of claim 13 , further comprising:

determining that the first SFI indicates a flexible communication direction for one or more symbols within the subset of slots; and

configuring the second SFI to indicate a communication direction for each of the one or more symbols.

16. The method of claim 13 , further comprising:

configuring the first SFI to comprise control information identifying and indicating configuration information for the subset of slots; and

configuring the second SFI to indicate a slot format for the subset of slots.

17. The method of claim 13 , further comprising:

transmitting a third SFI during a third monitoring period that is shorter in duration than the second monitoring period and occurs with the second monitoring period, the third SFI comprising an indication of a slot format for a slot associated with the third monitoring period.

18. The method of claim 17 , wherein the first monitoring period is for a discovery reference signal (DRS) measurement timing configuration (DMTC) window, the second monitoring period is for a transmission opportunity (TxOP) occurring within the DMTC window, and the third monitoring period is for the slot occurring within the TxOP.

19. The method of claim 13 , further comprising:

transmitting the first SFI in a first downlink control indicator (DCI) field; and

transmitting the second SFI in a second DCI field that is different from the first DCI field.

20. The method of claim 13 , further comprising:

performing at least one of joint encoding or concatenation on a common downlink control indicator (DCI) field to transmit the first SFI and the second SFI; and

transmitting the common DCI field to indicate the first SFI and the second SFI.

21. The method of claim 13 , further comprising:

transmitting a configuration message indicating the first monitoring period and the second monitoring period.

22. An apparatus for wireless communication, comprising:

a processor;

memory in electronic communication with the processor; and

instructions stored in the memory, wherein the instructions are executable by the processor to:

receive a first slot format indicator (SFI) during a first monitoring period for a set of slots associated with the first monitoring period;

receive a second SFI during a second monitoring period that is shorter in duration than the first monitoring period and occurs within the first monitoring period, the second SFI comprising an indication of slot formats for a subset of the slots associated with the second monitoring period; and

perform wireless communications over the subset of slots based at least in part on the first SFI and the second SFI.

23. The apparatus of claim 22 , wherein the instructions executable by the processor to perform the wireless communications comprise instructions executable by the processor to:

identify a communication direction for at least a portion of the symbols in the subset of slots based at least in part on the first SFI and the second SFI; and

perform the wireless communications over the subset of slots based at least in part on the identified communication direction.

24. The apparatus of claim 22 , wherein the instructions are further executable by the processor to:

determine that the first SFI indicates a flexible communication direction for one or more symbols within the subset of slots; and

identify a communication direction for each of the one or more symbols based at least in part on the second SFI.

25. The apparatus of claim 22 , wherein the first SFI comprises control information identifying and indicating configuration information for the subset of slots, wherein the instructions are further executable by the processor to:

identify a slot format for the subset of slots based at least in part on the second SFI.

26. An apparatus for wireless communication, comprising:

a processor;

memory in electronic communication with the processor; and

instructions stored in the memory, wherein the instructions are executable by the processor to:

transmit a first slot format indicator (SFI) during a first monitoring period for a set of slots associated with the first monitoring period;

transmit a second SFI during a second monitoring period that is shorter in duration than the first monitoring period and occurs within the first monitoring period, the second SFI comprising an indication of slot formats for a subset of the slots associated with the second monitoring period; and

perform wireless communications over the subset of slots based at least in part on the first SFI and the second SFI.

27. The apparatus of claim 26 , wherein the instructions executable by the processor to perform the wireless communications comprise instructions executable by the processor to:

identify a communication direction for at least a portion of the symbols in the subset of slots based at least in part on the first SFI and the second SFI; and

perform the wireless communications over the subset of slots based at least in part on the identified communication direction.

28. The apparatus of claim 26 , wherein the instructions are further executable by the processor to:

determine that the first SFI indicates a flexible communication direction for one or more symbols within the subset of slots; and

configure the second SFI to indicate a communication direction for each of the one or more symbols.

29. The apparatus of claim 26 , wherein the instructions are further executable by the processor to:

configure the first SFI to comprise control information identifying and indicating configuration information for the subset of slots; and

configure the second SFI to indicate a slot format for the subset of slots.

30. The apparatus of claim 26 , wherein the instructions are further executable by the processor to:

transmit a third SFI during a third monitoring period that is shorter in duration than the second monitoring period and occurs with the second monitoring period, the third SFI comprising an indication of a slot format for a slot associated with the third monitoring period.