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1. (WO2019067297) ASYNCHRONOUS SINGLE BEAM DIRECTIONAL LISTEN-BEFORE-TALK
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CLAIMS

What is claimed is:

1. A method for wireless communication, comprising:

performing a channel access procedure on a shared radio frequency spectrum band using a first beam configuration;

transmitting, based at least in part on successful completion of the channel access procedure, a reservation request message (RRQ) to a user equipment (UE) using a second beam configuration, the second beam configuration comprising a beam width that is equal to or narrower than a beam width of the first beam configuration; and

receiving a reservation response message (RRS) from the UE in response to the RRQ, the RRS comprising a third beam configuration that is based at least in part on the second beam configuration.

2. The method of claim 1, further comprising:

transmitting a preamble message in response to the RRS using the second beam configuration;

transmitting a control signal indicating one or more resources to be used for data communications; and

transmitting a data communication using the one or more resources.

3. The method of claim 1, further comprising:

determining that downlink data is available for a plurality of UEs; and performing, based at least in part on the determination, a sequence of channel access procedures over a plurality of corresponding beam directions using the first beam configuration.

4. The method of claim 3, further comprising:

performing the sequence of channel access procedures comprises, for beam direction: detecting an energy level in each direction over a predetermined number of contention slots, or monitoring for RRSs over the predetermined number of contention slots.

5. The method of claim 1, further comprising:

selecting a first beam width for the first beam configuration; and

6. The method of claim 5, further comprising:

selecting an energy or preamble detection threshold for the channel access procedure based at least in part on a width of the first beam width.

7. The method of claim 5, further comprising:

selecting an energy or preamble detection threshold for the channel access procedure based at least in part on a difference between the first beam width and the second beam width.

8. The method of claim 5, further comprising:

selecting an energy or preamble detection threshold for the channel access procedure based at least in part on whether the first beam width comprises a PI beam, a P2 beam, or a P3 beam.

9. The method of claim 1, further comprising:

selecting a first beam width for the first beam configuration and the second beam configuration.

10. The method of claim 9, further comprising:

configuring each UE of a plurality of UEs for which downlink data is available with orthogonal resources for receiving the corresponding RRSs.

11. The method of claim 9, further comprising:

configuring each UE of a plurality of UEs for which downlink data is available with overlapping resources for receiving the corresponding RRSs; and

determining an energy or preamble detection threshold for detecting each corresponding RRS based at least in part on the third beam configuration.

12. The method of claim 1, wherein determining that the channel access procedure is successful comprises:

determining that no RRQ or RRS are received from other devices during the channel access procedure.

13. The method of claim 1, wherein determining that the channel access procedure is successful comprises:

determining that no active RRQ or RRS are received from other devices during the channel access procedure, wherein an active RRQ or RRS comprises detecting a corresponding preamble message transmitted in response to the RRQ or RRS.

14. The method of claim 1, further comprising:

determining that an active RRQ or active RRS is received from other devices during the channel access procedure, wherein an active RRQ or active RRS comprises detecting a corresponding preamble message transmitted in response to the RRQ or RRS and within a fixed time period; and

performing a backoff procedure based at least in part on one or more of the active RRQ, the active RRS, an RRQ or RRS of a second operator, or an RRQ or RRS of the first operator.

15. The method of claim 1, further comprising:

configuring a preamble message in response to the RRS using the second beam configuration, wherein the preamble message confirms a reservation for uplink communications from the UE.

16. The method of claim 1, wherein the channel access procedure comprises at least one of an energy-based LBT procedure or a preamble-based LBT procedure.

17. A method for wireless communication, comprising:

performing a sequential energy detection-based listen-before-talk (LBT) channel access procedure on a shared radio frequency spectrum band using a plurality of beam configurations;

determining, based at least in part on successful completion of the channel access procedure for a first beam configuration of the plurality of beam configurations, that the shared radio frequency spectrum band is available for data communications using the first beam configuration; and

transmitting the data communications on the shared radio frequency spectrum band using the first beam configuration.

18. The method of claim 17, further comprising:

transmitting a control signal indicating one or more resources to be used for data communications; and

transmitting a data communication using the one or more resources.

19. The method of claim 17, further comprising:

determining that downlink data is available for a plurality of receiving devices; and

performing, based at least in part on the determination, a sequence of channel access procedures over a plurality of corresponding beam directions using the first beam configuration.

20. The method of claim 19, further comprising:

performing the sequence of channel access procedures comprises, for beam direction: detecting an energy level in each direction over a predetermined number of contention slots.

21. The method of claim 17, further comprising:

selecting a first beam width for the first beam configuration; and selecting a second beam width for the second beam configuration, the second beam width being narrower than the first beam width.

22. The method of claim 21, further comprising:

selecting an energy or preamble detection threshold for the channel access procedure based at least in part on a width of the first beam width.

23. The method of claim 21, further comprising:

selecting an energy or preamble detection threshold for the channel access procedure based at least in part on a difference between the first beam width and the second beam width.

24. The method of claim 21, further comprising:

selecting an energy or preamble detection threshold for the channel access procedure based at least in part on whether the first beam width comprises a PI beam, a P2 beam, or a P3 beam.

25. The method of claim 17, further comprising:

selecting a first beam width for the first beam configuration and the second beam configuration.

26. An apparatus for wireless communication, comprising: means for performing a channel access procedure on a shared radio frequency spectrum band using a first beam configuration;

means for transmitting, based at least in part on successful completion of the channel access procedure, a reservation request message (RRQ) to a user equipment (UE) using a second beam configuration, the second beam configuration comprising a beam width that is equal to or narrower than a beam width of the first beam configuration; and

means for receiving a reservation response message (RRS) from the UE in response to the RRQ, the RRS comprising a third beam configuration that is based at least in part on the second beam configuration.

27. The apparatus of claim 26, further comprising:

means for transmitting a preamble message in response to the RRS using the second beam configuration;

means for transmitting a control signal indicating one or more resources to be used for data communications; and

means for transmitting a data communication using the one or more resources.

28. The apparatus of claim 26, further comprising:

means for determining that downlink data is available for a plurality of UEs; and

means for performing, based at least in part on the determination, a sequence of channel access procedures over a plurality of corresponding beam directions using the first beam configuration.

29. An apparatus for wireless communication, comprising: means for performing a sequential energy detection-based listen-before-talk (LBT) channel access procedure on a shared radio frequency spectrum band using a plurality of beam configurations;

means for determining, based at least in part on successful completion of the channel access procedure for a first beam configuration of the plurality of beam

configurations, that the shared radio frequency spectrum band is available for data communications using the first beam configuration; and

means for transmitting the data communications on the shared radio frequency spectrum band using the first beam configuration.

30. The apparatus of claim 29, further comprising:

means for transmitting a control signal indicating one or more resources to be used for data communications; and

means for transmitting a data communication using the one or more resources.