Parameterized self-contained subframe structure having an interlaced portion followed by a tail portion

1. A method of wireless communication at a first device, comprising:

wirelessly communicating with a second device according to a first subframe structure, wherein the first subframe structure comprises a first periodic sequence of downlink transmission time intervals (TTIs) and uplink TTIs;

receiving a subframe truncation parameter from the second device, wherein the subframe truncation parameter indicates a total number of TTIs in the first subframe structure and partitions the total number of TTIs into an interlaced portion and a tail portion;

receiving a plurality of trigger messages from the second device during the downlink TTIs;

transmitting a plurality of response messages associated with the trigger messages during the uplink TTIs; and

terminating the first subframe structure based at least in part on the subframe truncation parameter wherein the first subframe structure terminates by truncating an uplink burst of a plurality of uplink TTIs into a last uplink TTI, and wherein during which a response message associated with outstanding trigger messages is transmitted in the last uplink TTI.

2. The method of claim 1 , wherein each downlink TTI of the first periodic sequence is associated with a nominal trigger-response delay parameter which is a function of a TTI index associated with the downlink TTI.

3. The method of claim 2 , wherein each uplink TTI of the first periodic sequence is associated with a nominal response-retrigger delay parameter which is a function of a TTI index associated with the downlink TTI.

4. The method of claim 3 , further comprising:

overriding the nominal trigger-response delay parameter or the nominal response-retrigger delay parameter associated with a TTI of the first subframe structure based at least in part on the subframe truncation parameter, wherein overriding the nominal trigger-response delay parameter comprises:

reducing a delay indicated by the nominal trigger-response delay parameter to enable transmission of a response message before termination of the first subframe structure.

5. The method of claim 1 , wherein the tail portion comprises a one-shot portion.

6. The method of claim 1 , wherein wirelessly communicating with the second device according to the first subframe structure comprises:

receiving a first trigger message from the second device during a first downlink TTI within the interlaced portion or a second trigger message from the second device during a second downlink TTI within the tail portion; and

transmitting to the second device, subsequent to receiving the first trigger message or the second trigger message, a first response message associated with the first trigger message, wherein the first response message is transmitted in an earliest uplink TTI of the first subframe structure that satisfies a nominal trigger-response delay parameter associated with the first downlink TTI, or a second response message associated with the second trigger message, wherein the second response message is transmitted in the last uplink TTI of the first subframe structure.

7. The method of claim 1 , further comprising:

wirelessly communicating with the second device according to a second subframe structure associated with a second periodic sequence of TTIs following termination of the first subframe structure, wherein the first periodic sequence of downlink TTIs and uplink TTIs comprises a repeating sequence of downlink bursts and uplink bursts, wherein each downlink burst comprises a first set of one or more downlink TTIs and each uplink burst comprises a second set of one or more uplink TTIs.

8. The method of claim 1 , further comprising:

receiving a number of parameters from the second device, wherein the number of parameters comprises at least one of: a first number of TTIs in a downlink burst, or a second number of TTIs in an uplink burst, or a nominal trigger-response delay parameter, or a nominal response-retrigger delay parameter, or a combination thereof.

9. The method of claim 1 , further comprising:

receiving, semi-statically at a frequency less than once per subframe, a number of parameters defining a configuration of a default subframe structure; and

receiving a bit at a beginning of the first subframe structure indicating whether the first subframe structure follows the configuration of the default subframe structure or a configuration of a predefined one-shot subframe structure.

10. The method of claim 1 , wherein the subframe truncation parameter is received during the first subframe structure.

11. An apparatus for wireless communication at a first device, comprising:

a processor; and

memory coupled to the processor, wherein the processor is configured to:

wirelessly communicate with a second device according to a first subframe structure, wherein the first subframe structure comprises a first periodic sequence of downlink transmission time intervals (TTIs) and uplink TTIs;

receive a subframe truncation parameter from the second device, wherein the subframe truncation parameter indicates a total number of TTIs in the first subframe structure and partitions the total number of TTIs into an interlaced portion and a tail portion;

receive a plurality of trigger messages from the second device during the downlink TTIs;

transmit a plurality of response messages associated with the trigger messages during uplink TTIs; and

terminate the first subframe structure based at least in part on the subframe truncation parameter, wherein the first subframe structure terminates by truncating an uplink burst a plurality of uplink TTIs into a last uplink TTI, and wherein a response message associated with outstanding trigger messages is transmitted in the last uplink TTI.

12. The apparatus of claim 11 , wherein each downlink TTI of the first periodic sequence is associated with a nominal trigger-response delay parameter which is a function of a TTI index associated with the downlink TTI.

13. The apparatus of claim 12 , wherein the processor configured to wirelessly communicate with the second device according to the first subframe structure is further configured to:

receive a first trigger message from the second device during a first downlink TTI within the interlaced portion or a second trigger message from the second device during a second downlink TTI within the tail portion; and

transmit to the second device, subsequent to receiving the first trigger message or the second trigger message, a first response message associated with the first trigger message, wherein the first response message is transmitted in an earliest uplink TTI of the first subframe structure that satisfies the nominal trigger-response delay parameter associated with the first downlink TTI, or a second response message associated with the second trigger message, wherein the second response message is transmitted in the last uplink TTI of the first subframe structure.

14. The apparatus of claim 11 , wherein the processor is further configured to:

receive, semi-statically at a frequency less than once per subframe, a number of parameters defining a configuration of a default subframe structure; and

receive a bit at a beginning of the first subframe structure indicating whether the first subframe structure follows the configuration of the default subframe structure or a configuration of a predefined one-shot subframe structure.

15. A method of wireless communication at a second device, comprising:

wirelessly communicating with a first device according to a first subframe structure, wherein the first subframe structure comprises a first periodic sequence of downlink transmission time intervals (TTIs) and uplink TTIs;

transmitting a subframe truncation parameter to the first device, wherein the subframe truncation parameter indicates a total number of TTIs in the first subframe structure and partitions the total number of TTIs into an interlaced portion and a tail portion;

transmitting a plurality of trigger messages during the downlink TTIs;

receiving a plurality of response messages associated with the trigger messages during uplink TTIs; and

receiving a response message associated with outstanding trigger messages in a last uplink TTI of the first subframe structure, wherein the first subframe structure terminates by truncating an uplink burst of a plurality of uplink TTIs into the last uplink TTI based at least in part on the subframe truncation parameter.

16. The method of claim 15 , wherein the first periodic sequence of downlink TTIs and uplink TTIs comprises a repeating sequence of downlink bursts and uplink bursts, wherein each downlink burst comprises a first set of one or more downlink TTIs and each uplink burst comprises a second set of one or more uplink TTIs.

17. The method of claim 15 , further comprising:

receiving, before terminating the first subframe structure, a transmission of a response message associated with a trigger message transmitted during a TTI of the first subframe structure, wherein the response message is received with a first trigger-response delay that is reduced compared to a second trigger-response delay indicated by a nominal trigger-response delay parameter associated with the TTI.

18. The method of claim 15 , wherein the tail portion comprises a one-shot portion.

19. The method of claim 15 , further comprising:

transmitting a number of parameters to the first device, wherein the number of parameters comprises at least one of: a first number of TTIs in a downlink burst, or a second number of TTIs in an uplink burst, or a nominal trigger-response delay parameter, or a nominal response-retrigger delay parameter, or a combination thereof.

20. The method of claim 15 , wherein the subframe truncation parameter is transmitted during the first subframe structure.

21. The method of claim 20 , wherein the subframe truncation parameter is transmitted:

during a predetermined TTI of the first subframe structure, or during a dynamically determined TTI of the first subframe structure, the dynamically determined TTI occurring before commencing terminating the first subframe structure.

22. The method of claim 15 , further comprising:

dynamically determining a value of the subframe truncation parameter based on at least one of: a traffic type, or a first bandwidth of the first device, or a second bandwidth associated with traffic for the first device, or a memory constraint, or a packet size, or an indicated service level, or a combination thereof.

23. An apparatus for wireless communication at a second device, comprising:

a processor; and

memory coupled to the processor, wherein the processor is configured to:

wirelessly communicate with a first device according to a first subframe structure, wherein the first subframe structure comprises a first periodic sequence of downlink transmission time intervals (TTIs) and uplink TTIs;

transmit a subframe truncation parameter to the first device, wherein the subframe truncation parameter indicates a total number of TTIs in the first subframe structure and partitions the total number of TTIs into an interlaced portion and a tail portion;

transmit a plurality of trigger messages during the downlink TTIs;

receive a plurality of response messages associated with the trigger messages during uplink TTIs; and

receive a response message associated with outstanding trigger messages in a last uplink TTI of the first subframe structure, wherein the first subframe structure terminates by truncating an uplink burst of a plurality of uplink TTIs into the last uplink TTI based at least in part on the subframe truncation parameter.

24. The apparatus of claim 23 , wherein the first periodic sequence of downlink TTIs and uplink TTIs comprises a repeating sequence of downlink bursts and uplink bursts, wherein each downlink burst comprises a first set of one or more downlink TTIs and each uplink burst comprises a second set of one or more uplink TTIs.

25. The apparatus of claim 23 , wherein the processor is further configured to:

receive, before terminating the first subframe structure, a transmission of a response message associated with a trigger message transmitted during a TTI of the first subframe structure, wherein the response message is received with a first trigger-response delay that is reduced compared to a second trigger-response delay indicated by a nominal trigger-response delay parameter associated with the TTI.

26. The apparatus of claim 23 , wherein the subframe truncation parameter is transmitted:

during a predetermined TTI of the first subframe structure, or during a dynamically determined TTI of the first subframe structure, the dynamically determined TTI occurring before commencing terminating the first subframe structure.

27. The apparatus of claim 23 , wherein the processor is further configured to:

dynamically determine a value of the subframe truncation parameter based on at least one of: a traffic type, or a first bandwidth of the first device, or a second bandwidth associated with traffic for the first device, or a memory constraint, or a packet size, or an indicated service level, or a combination thereof.