System and method for beam switching and reporting

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

selecting a first beam for communication with a base station;

attempting, through the selected first beam, at least one random access channel (RACH) procedure with the base station;

determining that the at least one RACH procedure failed with the base station; and

sending, after a successful RACH procedure with the base station, information indicating an index corresponding to the selected first beam through which the at least one RACH procedure failed, wherein the information indicates that the index is to be excluded from a list of candidate beam indexes based on the failure of the at least one RACH procedure.

2. The method of claim 1 , further comprising:

selecting a new beam for communication with the base station after the determination that the at least one RACH procedure failed,

wherein at least a portion of the successful RACH procedure is performed through the selected new beam.

3. The method of claim 1 , further comprising:

increasing a transmission power after the determination that the at least one RACH procedure failed,

wherein at least a portion of the successful RACH procedure is performed with the increased transmission power.

4. The method of claim 1 , further comprising:

storing information associated with the selected first beam based on the determination that the at least one RACH procedure failed.

5. The method of claim 4 , wherein the information indicating the index corresponding to the selected first beam through which the at least one RACH procedure failed further includes the stored information associated with the first beam.

6. The method of claim 1 , wherein the information indicating the index corresponding to the selected first beam through which the at least one RACH procedure failed further includes an indication of a subframe in which a RACH message associated with the at least one RACH procedure is carried.

7. The method of claim 1 , further comprising:

excluding the selected first beam from a candidate beam set maintained by the UE based on the determination that the at least one RACH procedure failed.

8. The method of claim 1 , wherein the information indicating the index corresponding to the selected first beam through which the at least one RACH procedure failed comprises a beam status information (BSI) report.

9. The method of claim 1 , wherein the at least one RACH procedure comprises at least one of:

transmitting, to the base station, a random access preamble;

receiving, from the base station, a random access response based on the random access preamble;

transmitting, to the base station, a connection request message based on the random access response; or

receiving a contention resolution message based on the connection request message.

10. The method of claim 1 , wherein the UE is synchronized with a network that includes the base station based on the successful RACH procedure.

11. An apparatus for wireless communication, the apparatus comprising:

means for selecting a first beam for communication with a base station;

means for attempting, through the selected first beam, at least one random access channel (RACH) procedure with the base station;

means for determining that the at least one RACH procedure failed with the base station; and

means for sending, after a successful RACH procedure with the base station, information indicating an index corresponding to the selected first beam through which the at least one RACH procedure failed, wherein the information indicates that the index is to be excluded from a list of candidate beam indexes based on the failure of the at least one RACH procedure.

12. The apparatus of claim 11 , further comprising:

means for selecting a new beam for communication with the base station after the determination that the at least one RACH procedure failed,

wherein at least a portion of the successful RACH procedure is performed through the selected new beam.

13. The apparatus of claim 11 , further comprising:

means for increasing a transmission power after the determination that the at least one RACH procedure failed,

wherein at least a portion of the successful RACH procedure is performed with the increased transmission power.

14. The apparatus of claim 11 , further comprising:

means for storing information associated with the selected first beam based on the determination that the at least one RACH procedure failed.

15. The apparatus of claim 14 , wherein the information indicating the index corresponding to the selected first beam through which the at least one RACH procedure failed further includes the stored information associated with the first beam.

16. The apparatus of claim 11 , wherein the information indicating the index corresponding to the selected first beam through which the at least one RACH procedure failed further includes an indication of a subframe in which a RACH message associated with the at least one RACH procedure is carried.

17. The apparatus of claim 11 , further comprising:

means for excluding the selected first beam from a candidate beam set maintained by the apparatus based on the determination that the at least one RACH procedure failed.

18. The apparatus of claim 11 , wherein the information indicating the index corresponding to the selected first beam through which the at least one RACH procedure failed comprises a beam status information (BSI) report.

19. The apparatus of claim 11 , wherein the means for attempting the at least one RACH procedure is configured to at least one of:

transmit, to the base station, a random access preamble;

receive, from the base station, a random access response based on the random access preamble;

transmit, to the base station, a connection request message based on the random access response; or

receive a contention resolution message based on the connection request message.

20. The apparatus of claim 11 , wherein the apparatus is synchronized with a network that includes the base station based on the successful RACH procedure.

21. An apparatus for wireless communication, the apparatus comprising:

a memory; and

at least one processor coupled to the memory and configured to:

select a first beam for communication with a base station;

attempt, through the selected first beam, at least one random access channel (RACH) procedure with the base station;

determine that the at least one RACH procedure failed with the base station; and

send, after a successful RACH procedure with the base station, information indicating an index corresponding to the selected first beam through which the at least one RACH procedure failed, wherein the information indicates that the index is to be excluded from a list of candidate beam indexes based on the failure of the at least one RACH procedure.

22. The apparatus of claim 21 , wherein the at least one processor is further configured to:

select a new beam for communication with the base station after the determination that the at least one RACH procedure failed,

wherein at least a portion of the successful RACH procedure is performed through the selected new beam.

23. The apparatus of claim 21 , wherein the at least one processor is further configured to:

increase a transmission power after the determination that the at least one RACH procedure failed,

wherein at least a portion of the successful RACH procedure is performed with the increased transmission power.

24. The apparatus of claim 21 , wherein the at least one processor is further configured to:

store information associated with the selected first beam based on the determination that the at least one RACH procedure failed.

25. The apparatus of claim 24 , wherein the information indicating the index corresponding to the selected first beam through which the at least one RACH procedure failed further includes the stored information associated with the first beam.

26. The apparatus of claim 21 , wherein the information indicating the index corresponding to the selected first beam through which the at least one RACH procedure failed further includes an indication of a subframe in which a RACH message associated with the at least one RACH procedure is carried.

27. The apparatus of claim 21 , wherein the at least one processor is further configured to:

exclude the selected first beam from a candidate beam set maintained by the apparatus based on the determination that the at least one RACH procedure failed.

28. The apparatus of claim 21 , wherein the information indicating the index corresponding to the selected first beam through which the at least one RACH procedure failed comprises a beam status information (BSI) report.

29. The apparatus of claim 21 , wherein the at least one RACH procedure comprises at least one of:

transmission, to the base station, of a random access preamble;

reception, from the base station, of a random access response based on the random access preamble;

transmission, to the base station, of a connection request message based on the random access response; or

reception of a contention resolution message based on the connection request message.

30. A non-transitory, computer-readable medium storing computer-executable code for wireless communication by a user equipment (UE), comprising code to:

select a first beam for communication with a base station;

attempt, through the selected first beam, at least one random access channel (RACH) procedure with the base station;

determine that the at least one RACH procedure failed with the base station; and

send, after a successful RACH procedure with the base station, information indicating an index corresponding to the selected first beam through which the at least one RACH procedure failed, wherein the information indicates that the index is to be excluded from a list of candidate beam indexes based on the failure of the at least one RACH procedure.