QCL indication by UE-beam based tagging

1. A method for wireless communication by a user equipment (UE), comprising:

receiving an indication of a beam pair link (BPL), wherein the BPL comprises a base station (BS) transmit beam and a corresponding UE receive beam;

assigning a tag to the BPL, wherein the tag assigned to the BPL is a function of the UE receive beam; and

taking one or more actions associated with the tagged BPL.

2. The method of claim 1 , wherein taking the one or more actions comprises:

transmitting, to the BS, an indication of the tagged BPL.

3. The method of claim 1 , wherein taking the one more actions comprises:

receiving signaling in accordance with the BPL.

4. The method of claim 1 , wherein taking the one or more actions comprises:

receiving a downlink transmission indicating beam refinement of the BS transmit beam of the tagged BPL;

during the refinement, receiving signaling, transmitted from one or more neighboring beams of the BS transmit beam, using the UE receive beam;

determining a signal quality associated with transmissions from one or more of the neighboring beams of the BS transmit beam; and

indicating to the BS a recommended BS transmit beam corresponding to the UE receive beam of the tagged BPL based, at least in part, on the determined signal quality.

5. The method of claim 1 , wherein taking the one or more actions comprises:

receiving a downlink transmission indicating beam refinement of the UE receive beam of the tagged BPL;

during the refinement, receiving signaling from the BS transmit beam via one or more receive beams neighboring the corresponding UE receive beam of the BPL;

determining a signal quality associated with one or more of the neighboring beams of the UE receive beam; and

updating the UE receive beam corresponding to the BS transmit beam of the tagged BPL based at least in part, on the determined signal quality.

6. The method of claim 5 , further comprising:

determining whether a different tag is needed in response to the updated UE receive beam;

in response to determining a different tag is needed, computing the different tag;

indicating the different tag to the BS; and

assigning the different tag to the updated UE receive beam and BS transmit beam.

7. The method of claim 6 , wherein the different tag comprises one of: a new tag or a currently-used tag.

8. The method of claim 1 , wherein taking one or more actions associated with the tagged BPL comprises:

transmitting, to the BS, an indication of the tagged BPL in response to at least one of: a new BPL or an established BPL sharing a same UE receive beam with the new BPL.

9. The method of claim 1 , wherein taking one or more actions associated with the tagged BPL comprises:

receiving, from the BS, a message to remove a tag and its current association to one or more BPLs; and

in response to the message, making the removed tag available for assignment to one or more new BPLs.

10. A method for wireless communication by a base station (BS), comprising:

transmitting an indication of a beam pair link (BPL), wherein the BPL comprises a BS transmit beam and a corresponding user equipment (UE) receive beam;

receiving an indication of a tag assigned to the BPL, wherein the tag of assigned to the BPL is a function of the UE receive beam; and

taking one or more actions associated with the tagged BPL.

11. The method of claim 10 , receiving the indication of the tag comprises:

receiving, from the UE, an indication of the tagged BPL.

12. The method of claim 10 , wherein taking the one more actions comprises:

transmitting signaling in accordance with the BPL.

13. The method of claim 12 , wherein the tag comprises a beam indication.

14. The method of claim 10 , wherein taking the one or more actions comprises:

transmitting a downlink assignment indicating beam refinement of the BS transmit beam of the tagged BPL;

during the refinement, transmitting signaling, using one or more neighboring beams of the BS transmit beam; and

receiving a recommendation for an updated BS transmit beam corresponding to the UE receive beam of the tagged BPL, wherein the updated BS transmit beam and the corresponding UE receive beam are assigned the tag.

15. The method of claim 10 , wherein taking the one or more actions comprises:

transmitting a downlink assignment indicating beam refinement of the UE receive beam of the tagged BPL;

during the refinement, transmitting signaling using the BS transmit beam; and

receiving an updated tag, which maybe a new or old tag corresponding to the BS transmit beam of the tagged BPL, wherein the updated UE receive beam and the corresponding BS transmit beam are assigned one of the tag or an updated tag.

16. The method of claim 15 , further comprising:

transmitting an indication for the updated tag in response to the updated UE receive beam; and

receiving the updated tag assigned to the updated UE receive beam and BS transmit beam.

17. The method of claim 10 , wherein taking one or more actions associated with the tagged BPL comprises:

receiving an indication of the tagged BPL in response to at least one of: a new BPL or an established BPL sharing a same UE receive beam with the new BPL.

18. The method of claim 10 , wherein taking the one or more actions associated with the tagged BPL comprises:

signaling to the UE removal of a tag and its current association to one or more BPLs wherein the removed tag is available for future assignment to one or more new BPLs.

19. An apparatus for wireless communication by a user equipment (UE), comprising:

means for receiving an indication of a beam pair link (BPL), wherein the BPL comprises a base station (BS) transmit beam and a corresponding UE receive beam;

means for assigning a tag to the BPL, wherein the tag assigned to the BPL is a function of the UE receive beam; and

means for taking one or more actions associated with the tagged BPL.

20. The apparatus of claim 19 , wherein the means for taking the one or more actions comprises:

means for transmitting, to the BS, an indication of the tagged BPL.

21. The apparatus of claim 19 , wherein the means for taking the the one more actions comprises:

means for receiving signaling in accordance with the BPL.

22. The apparatus of claim 19 , wherein the means for taking the one or more actions comprises:

means for receiving a downlink transmission indicating beam refinement of the BS transmit beam of the tagged BPL;

during the refinement, means for receiving signaling, transmitted from one or more neighboring beams of the BS transmit beam, using the UE receive beam;

means for determining a signal quality associated with transmissions from one or more of the neighboring beams of the BS transmit beam; and

means for indicating to the BS a recommended BS transmit beam corresponding to the UE receive beam of the tagged BPL based, at least in part, on the determined signal quality.

23. The apparatus of claim 22 , wherein the means for taking the one or more actions comprises:

means for receiving a downlink transmission indicating beam refinement of the UE receive beam of the tagged BPL;

during the refinement, means for receiving signaling from the BS transmit beam via one or more receive beams neighboring the corresponding UE receive beam of the BPL;

means for determining a signal quality associated with one or more of the neighboring beams of the UE receive beam; and

means for updating the UE receive beam corresponding to the BS transmit beam of the tagged BPL based at least in part, on the determined signal quality.

24. The apparatus of claim 23 , further comprising:

means for determining whether a different tag is needed in response to the updated UE receive beam;

in response to determining a different tag is needed, means for computing the different tag;

means for indicating the different tag to the BS; and

means for assigning the different tag to the updated UE receive beam and BS transmit beam.

25. The apparatus of claim 24 , wherein the different tag comprises one of: a new tag or a currently-used tag.

26. An apparatus for wireless communication by a base station (BS), comprising:

means for transmitting an indication of a beam pair link (BPL), wherein the BPL comprises a BS transmit beam and a corresponding user equipment (UE) receive beam;

means for receiving an indication of a tag assigned to the BPL, wherein the tag assigned to the BPL is a function of the UE receive beam; and

means for taking one or more actions associated with the tagged BPL.

27. The apparatus of claim 26 , wherein the means for taking the one or more actions comprises:

means for transmitting a downlink assignment indicating beam refinement of the BS transmit beam of the tagged BPL;

during the refinement, means for transmitting signaling, using one or more neighboring beams of the BS transmit beam; and

means for receiving a recommendation for an updated BS transmit beam corresponding to the UE receive beam of the tagged BPL, wherein the updated BS transmit beam and the corresponding UE receive beam are assigned the tag.

28. The apparatus of claim 26 , wherein the means for taking the one or more actions comprises:

means for transmitting a downlink assignment indicating beam refinement of the UE receive beam of the tagged BPL;

during the refinement, means for transmitting signaling using the BS transmit beam; and

means for receiving an updated tag, which maybe a new or old tag corresponding to the BS transmit beam of the tagged BPL, wherein the updated UE receive beam and the corresponding BS transmit beam are assigned one of the tag or an updated tag.

29. The apparatus of claim 28 , further comprising:

means for transmitting an indication for the updated tag in response to the updated UE receive beam; and

means for receiving the updated tag assigned to the updated UE receive beam and BS transmit beam.

30. The apparatus of claim 26 , wherein the means for taking the one or more actions associated with the tagged BPL comprises:

means for signaling to the UE removal of a tag and its current association to one or more BPLs wherein the removed tag is available for future assignment to one or more new BPLs.