System and method for beam switching and reporting
A UE may receive a beam modification command that indicates a set of transmit beam indexes corresponding to a set of transmit beams of a base station, and each transmit beam index of the set of transmit beam indexes may indicate at least a transmit direction for transmitting a transmit beam by the base station. The UE may determine a set of receive beam indexes corresponding to receive beams of the UE based on the set of transmit beam indexes, and each receive beam index of the set of receive beam indexes may indicate at least a receive direction for receiving a receive beam by the UE. The UE may receive, from the base station, a signal through at least one receive beam corresponding to at least one receive beam index included in the set of receive beam indexes.
1. A method of wireless communication by a user equipment (UE), the method comprising:
receiving a beam modification command that indicates a set of transmit beam indexes corresponding to a set of transmit beams of a base station, each transmit beam index of the set of transmit beam indexes indicating at least a transmit direction for transmitting a transmit beam by the base station;
determining a set of receive beam indexes corresponding to receive beams of the UE based on the set of transmit beam indexes, each receive beam index of the set of receive beam indexes indicating at least a receive direction for receiving a receive beam by the UE; and
receiving, from the base station, a beam refinement reference signal (BRRS) through at least one receive beam corresponding to at least one receive beam index included in the set of receive beam indexes.
2. The method of claim 1 , wherein the receiving, from the base station, the BRRS through the at least one receive beam corresponding to the at least one receive beam index included in the set of receive beam indexes comprises:
receiving a first portion of the BRRS in a first set of symbols through a first receive beam corresponding to a first receive beam index included in the set of receive beam indexes; and
receiving a second portion of the BRRS in a second set of symbols through a second receive beam corresponding to a second receive beam index included in the set of receive beam indexes.
3. The method of claim 1 , wherein the BRRS is received in one or more symbols corresponding to one or more symbol indexes.
4. The method of claim 3 , wherein the beam modification command indicates the one or more symbol indexes, and a corresponding transmit beam index of the set of transmit beam indexes for each symbol index of the one or more symbol indexes.
5. The method of claim 3 , wherein the one or more symbol indexes in which the BRRS is received are predetermined.
6. The method of claim 1 , wherein the BRRS is received through the set of transmit beams from the base station corresponding to the set of transmit beam indexes.
7. The method of claim 1 , wherein the BRRS is received through a different set of transmit beams from the base station than the set of transmit beams corresponding to the set of transmit beam indexes, the different set of transmit beams corresponding to a second set of transmit beam indexes different from the set of transmit beam indexes.
8. The method of claim 1 , wherein the beam modification command is received in a medium access control (MAC) control element (CE).
9. The method of claim 1 , wherein the beam modification command is received in a downlink control indicator (DCI) message.
10. The method of claim 1 , wherein the beam modification command is received via radio resource control (RRC) signaling.
11. An apparatus for wireless communication, the apparatus comprising:
means for receiving a beam modification command that indicates a set of transmit beam indexes corresponding to a set of transmit beams of a base station, each transmit beam index of the set of transmit beam indexes indicating at least a transmit direction for transmitting a transmit beam by the base station;
means for determining a set of receive beam indexes corresponding to receive beams of the apparatus based on the set of transmit beam indexes, each receive beam index of the set of receive beam indexes indicating at least a receive direction for receiving a receive beam by the apparatus; and
means for receiving, from the base station, a beam refinement reference signal (BRRS) through at least one receive beam corresponding to at least one receive beam index included in the set of receive beam indexes.
12. The apparatus of claim 11 , wherein the means for receiving, from the base station, the BRRS through the at least one receive beam corresponding to the at least one receive beam index included in the set of receive beam indexes is configured to:
receive a first portion of the BRRS in a first set of symbols through a first receive beam corresponding to a first receive beam index included in the set of receive beam indexes; and
receive a second portion of the BRRS in a second set of symbols through a second receive beam corresponding to a second receive beam index included in the set of receive beam indexes.
13. The apparatus of claim 11 , wherein the BRRS is received in one or more symbols corresponding to one or more symbol indexes.
14. The apparatus of claim 13 , wherein the beam modification command indicates the one or more symbol indexes, and a corresponding transmit beam index of the set of transmit beam indexes for each symbol index of the one or more symbol indexes.
15. The apparatus of claim 13 , wherein the one or more symbol indexes in which the BRRS is received are predetermined.
16. The apparatus of claim 11 , wherein the BRRS is received through the set of transmit beams from the base station corresponding to the set of transmit beam indexes.
17. The apparatus of claim 11 , wherein the BRRS is received through a different set of transmit beams from the base station than the set of transmit beams corresponding to the set of transmit beam indexes, the different set of transmit beams corresponding to a second set of transmit beam indexes different from the set of transmit beam indexes.
18. The apparatus of claim 11 , wherein the beam modification command is received in a medium access control (MAC) control element (CE).
19. The apparatus of claim 11 , wherein the beam modification command is received in a downlink control indicator (DCI) message.
20. The apparatus of claim 11 , wherein the beam modification command is received via radio resource control (RRC) signaling.
21. An apparatus for wireless communication, the apparatus comprising:
a memory; and
at least one processor coupled to the memory and configured to:
receive a beam modification command that indicates a set of transmit beam indexes corresponding to a set of transmit beams of a base station, each transmit beam index of the set of transmit beam indexes indicating at least a transmit direction for transmitting a transmit beam by the base station;
determine a set of receive beam indexes corresponding to receive beams of the UE based on the set of transmit beam indexes, each receive beam index of the set of receive beam indexes indicating at least a receive direction for receiving a receive beam by the UE; and
receive, from the base station, a beam refinement reference signal (BRRS) through at least one receive beam corresponding to at least one receive beam index included in the set of receive beam indexes.
22. The apparatus of claim 21 , wherein the at least one processor is configured to receive, from the base station, the BRRS through the at least one receive beam corresponding to the at least one receive beam index included in the set of receive beam indexes by:
receiving a first portion of the BRRS in a first set of symbols through a first receive beam corresponding to a first receive beam index included in the set of receive beam indexes; and
receiving a second portion of the BRRS in a second set of symbols through a second receive beam corresponding to a second receive beam index included in the set of receive beam indexes.
23. The apparatus of claim 21 , wherein the BRRS is received in one or more symbols corresponding to one or more symbol indexes.
24. The apparatus of claim 23 , wherein the beam modification command indicates the one or more symbol indexes, and a corresponding transmit beam index of the set of transmit beam indexes for each symbol index of the one or more symbol indexes.
25. The apparatus of claim 23 , wherein the one or more symbol indexes in which the BRRS is received are predetermined.
26. The apparatus of claim 21 , wherein the BRRS is received through the set of transmit beams from the base station corresponding to the set of transmit beam indexes.
27. The apparatus of claim 21 , wherein the BRRS is received through a different set of transmit beams from the base station than the set of transmit beams corresponding to the set of transmit beam indexes, the different set of transmit beams corresponding to a second set of transmit beam indexes different from the set of transmit beam indexes.
28. The apparatus of claim 21 , wherein the beam modification command is received in a medium access control (MAC) control element (CE) or a downlink control indicator (DCI) message.
29. The apparatus of claim 21 , wherein the beam modification command is received via radio resource control (RRC) signaling.
30. A non-transitory, computer-readable medium storing computer-executable code for wireless communication by a user equipment (UE), comprising code to:
receive a beam modification command that indicates a set of transmit beam indexes corresponding to a set of transmit beams of a base station, each transmit beam index of the set of transmit beam indexes indicating at least a transmit direction for transmitting a transmit beam by the base station;
determine a set of receive beam indexes corresponding to receive beams of the UE based on the set of transmit beam indexes, each receive beam index of the set of receive beam indexes indicating at least a receive direction for receiving a receive beam by the UE; and
receive, from the base station, a beam refinement reference signal (BRRS) through at least one receive beam corresponding to at least one receive beam index included in the set of receive beam indexes.