Handling of orphan symbols in shared spectrum
Aspects of the present disclosure provide techniques for handling scenarios where a physical uplink shared channel (PUSCH) repetition is scheduled as a single symbol. According to certain aspects, a user equipment (UE) is configured to detect that a nominal physical uplink shared channel (PUSCH) repetition is to be segmented into one or more actual PUSCH repetitions that include a single symbol actual PUSCH repetition and take one or more actions to handle a symbol length gap in transmission due to the single symbol actual PUSCH repetition.
1. A method for wireless communications by a user equipment (UE), comprising:
detecting that a nominal physical uplink shared channel (PUSCH) repetition is to be segmented into one or more actual PUSCH repetitions that include a single symbol actual PUSCH repetition; and
taking one or more actions to handle a symbol length gap in a transmission due to the single symbol actual PUSCH repetition,
wherein the one or more actions comprise using a cyclic prefix (CP) extension from an actual PUSCH repetition after the single symbol actual PUSCH repetition.
2. The method of claim 1 , wherein the length of the CP extension is a single symbol duration.
3. The method of claim 1 , wherein the length of the CP extension occupies less than a symbol duration and equal to or larger than the symbol duration less a delta value.
4. The method of claim 1 , wherein the one or more actions comprise:
dropping the single symbol actual PUSCH repetition if there is no actual PUSCH repetition scheduled after the single symbol actual PUSCH repetition.
5. The method of claim 1 , wherein the one or more actions comprise:
treating the detection of the single symbol actual PUSCH repetition as an error case.
6. The method of claim 1 , further comprising:
detecting semi-static downlink symbols or radio resource control (RRC) configured invalid symbols in the middle of the one or more actual PUSCH repetitions, wherein:
the one or more actions comprise treating the detection of the semi-static downlink symbols or the radio resource control (RRC) configured invalid symbols in the middle of the one or more actual PUSCH repetitions as an error case.
7. The method of claim 1 , wherein the one or more actions are taken based, at least in part, on how the single symbol actual PUSCH repetition was detected.
8. The method of claim 7 , wherein a different one of the one or more actions is taken depending on whether the nominal PUSCH repetition was detected as a result of:
the nominal PUSCH repetition crosses a slot boundary;
the nominal PUSCH repetition is segmented into the one or more actual PUSCH repetitions due to a conflict with semi-static downlink symbols; or
the nominal PUSCH repetition is segmented into the one or more actual PUSCH repetitions due to an overlap with radio resource control (RRC) configured invalid symbols.
9. The method of claim 1 , wherein the one or more actions comprise:
using an uplink channel procedure to resume the transmission at a boundary of each of the one or more actual PUSCH repetitions if the nominal PUSCH repetition was detected as a result of:
the nominal PUSCH repetition is segmented into the one or more actual PUSCH repetitions due to a conflict with semi-static downlink symbols; or
the nominal PUSCH repetition is segmented into the one or more actual PUSCH repetitions due to an overlap with radio resource control (RRC) configured invalid symbols.
10. The method of claim 9 , wherein the one or more actions further comprise:
dropping the single symbol actual PUSCH repetition immediately after the semi-static downlink symbols or the radio resource control (RRC) configured invalid symbols.
11. An apparatus for wireless communications by a user equipment (UE), comprising:
a processing system configured to:
detect that a nominal physical uplink shared channel (PUSCH) repetition is to be segmented into one or more actual PUSCH repetitions that include a single symbol actual PUSCH repetition; and
take one or more actions to handle a symbol length gap in a transmission due to the single symbol actual PUSCH repetition,
wherein the one or more actions comprise using a cyclic prefix (CP) extension from an actual PUSCH repetition after the single symbol actual PUSCH repetition.
12. The apparatus of claim 11 , wherein the length of the CP extension is a single symbol duration.
13. The apparatus of claim 11 , wherein the length of the CP extension occupies less than a symbol duration and equal to or larger than the symbol duration less a delta value.
14. The apparatus of claim 11 , wherein the one or more actions comprise:
dropping the single symbol actual PUSCH repetition if there is no actual PUSCH repetition scheduled after the single symbol actual PUSCH repetition.
15. The apparatus of claim 11 , wherein the one or more actions comprise:
treating the detection of the single symbol actual PUSCH repetition as an error case.
16. The apparatus of claim 11 , further comprising:
detecting semi-static downlink symbols or radio resource control (RRC) configured invalid symbols in the middle of the one or more actual PUSCH repetitions, wherein:
the one or more actions comprise treating the detection of the semi-static downlink symbols or the radio resource control (RRC) configured invalid symbols in the middle of the one or more actual PUSCH repetitions as an error case.
17. The apparatus of claim 11 , wherein the one or more actions are taken based, at least in part, on how the single symbol actual PUSCH repetition was detected.
18. The apparatus of claim 17 , wherein a different one of the one or more actions is taken depending on whether the nominal PUSCH repetition was detected as a result of:
the nominal PUSCH repetition crosses a slot boundary;
the nominal PUSCH repetition is segmented into the one or more actual PUSCH repetitions due to a conflict with semi-static downlink symbols; or
the nominal PUSCH repetition is segmented into the one or more actual PUSCH repetitions due to an overlap with radio resource control (RRC) configured invalid symbols.
19. The apparatus of claim 11 , wherein the one or more actions comprise using an uplink channel procedure to resume the transmission at a boundary of each of the one or more actual PUSCH repetitions if the nominal PUSCH repetition was detected as a result of:
the nominal PUSCH repetition is segmented into the one or more actual PUSCH repetitions due to a conflict with semi-static downlink symbols; or
the nominal PUSCH repetition is segmented into the one or more actual PUSCH repetitions due to an overlap with radio resource control (RRC) configured invalid symbols.
20. The apparatus of claim 19 , wherein the one or more actions further comprise:
dropping the single symbol actual PUSCH repetition immediately after the semi-static downlink symbols or the radio resource control (RRC) configured invalid symbols.
21. An apparatus for wireless communications by a user equipment (UE), comprising:
means for detecting that a nominal physical uplink shared channel (PUSCH) repetition is to be segmented into one or more actual PUSCH repetitions that include a single symbol actual PUSCH repetition; and
means for taking one or more actions to handle a symbol length gap in a transmission due to the single symbol actual PUSCH repetition,
wherein the one or more actions comprise using a cyclic prefix (CP) extension from an actual PUSCH repetition after the single symbol actual PUSCH repetition.
22. The apparatus of claim 21 , wherein the length of the CP extension is a single symbol duration.
23. The apparatus of claim 21 , wherein the length of the CP extension occupies less than a symbol duration and equal to or larger than the symbol duration less a delta value.
24. The apparatus of claim 21 , wherein the one or more actions comprise:
dropping the single symbol actual PUSCH repetition if there is no actual PUSCH repetition scheduled after the single symbol actual PUSCH repetition.
25. The apparatus of claim 21 , wherein the one or more actions comprise:
treating the detection of the single symbol actual PUSCH repetition as an error case.
26. The apparatus of claim 21 , further comprising:
means for detecting semi-static downlink symbols or radio resource control (RRC) configured invalid symbols in the middle of the one or more actual PUSCH repetitions, wherein:
the one or more actions comprise treating the detection of the semi-static downlink symbols or the radio resource control (RRC) configured invalid symbols in the middle of the one or more actual PUSCH repetitions as an error case.
27. The apparatus of claim 21 , wherein the one or more actions are taken based, at least in part, on how the single symbol actual PUSCH repetition was detected.
28. The apparatus of claim 27 , wherein a different one of the one or more actions is taken depending on whether the nominal PUSCH repetition was detected as a result of:
the nominal PUSCH repetition crosses a slot boundary;
the nominal PUSCH repetition is segmented into the one or more actual PUSCH repetitions due to a conflict with semi-static downlink symbols; or
the nominal PUSCH repetition is segmented into the one or more actual PUSCH repetitions due to an overlap with radio resource control (RRC) configured invalid symbols.
29. The apparatus of claim 21 , wherein the one or more actions comprise using an uplink channel procedure to resume the transmission at a boundary of each of the one or more actual PUSCH repetitions if the nominal PUSCH repetition was detected as a result of:
the nominal PUSCH repetition is segmented into the one or more actual PUSCH repetitions due to a conflict with semi-static downlink symbols; or
the nominal PUSCH repetition is segmented into the one or more actual PUSCH repetitions due to an overlap with radio resource control (RRC) configured invalid symbols.
30. The apparatus of claim 29 , wherein the one or more actions further comprise:
dropping the single symbol actual PUSCH repetition immediately after the semi-static downlink symbols or the radio resource control (RRC) configured invalid symbols.
31. A user equipment (UE), comprising:
at least one antenna; and
a processing system configured to:
detect that a nominal physical uplink shared channel (PUSCH) repetition is to be segmented into one or more actual PUSCH repetitions that include a single symbol actual PUSCH repetition; and
take one or more actions, via the at least one antenna, to handle a symbol length gap in a transmission due to the single symbol actual PUSCH repetition,
wherein the one or more actions comprise using a cyclic prefix (CP) extension from an actual PUSCH repetition after the single symbol actual PUSCH repetition.
32. A computer-readable medium for wireless communications by a user equipment (UE), comprising codes executable to:
detect that a nominal physical uplink shared channel (PUSCH) repetition is to be segmented into one or more actual PUSCH repetitions that include a single symbol actual PUSCH repetition; and
take one or more actions to handle a symbol length gap in a transmission due to the single symbol actual PUSCH repetition,
wherein the one or more actions comprise using a cyclic prefix (CP) extension from an actual PUSCH repetition after the single symbol actual PUSCH repetition.