System and method for beam switching and reporting

1. A method of wireless communication for a base station, the method comprising:

sending a beam modification command that indicates a set of transmit beam indexes corresponding to a set of transmit beams associated with the base station and indicates a first set of symbol indexes corresponding to a first set of symbols of a reference signal, 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, wherein the beam modification command is included in one of a medium access control element (MAC) control element (CE) or a downlink control information (DCI) message, and wherein the reference signal comprises a channel-state information reference signal (CSI-RS); and

sending, in association with the beam modification command, the reference signal using at least one transmit beam of the set of transmit beams, wherein a first portion of the reference signal is sent in the first set of symbols.

2. The method of claim 1 , wherein the sending the reference signal using the at least one transmit beam of the set of transmit beams comprises:

sending the first portion of the reference signal in the first set of symbols using a first transmit beam of the set of transmit beams; and

sending a second portion of the reference signal in a second set of symbols using a second transmit beam of the set of transmit beams.

3. The method of claim 1 , wherein the beam modification command further indicates a second set of symbol indexes corresponding to a second set of symbols, and at least a second portion of the reference signal is received in the second set of symbols.

4. The method of claim 3 , wherein the beam modification command indicates a first correspondence between a first transmit beam index of the set of transmit beam indexes and the first set of symbol indexes, and the beam modification command indicates a second correspondence between a second transmit beam index of the set of transmit beam indexes and the second set of symbol indexes.

5. The method of claim 1 , further comprising:

determining the set of transmit beams to be used for transmitting the reference signal.

6. An apparatus comprising:

means for sending, by a base station, a beam modification command that indicates a set of transmit beam indexes corresponding to a set of transmit beams associated with the base station and indicates a first set of symbol indexes corresponding to a first set of symbols of a reference signal, 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, wherein the beam modification command is included in one of a medium access control element (MAC) control element (CE) or a downlink control information (DCI) message, and wherein the reference signal comprises a channel-state information reference signal (CSI-RS); and

means for sending, by a base station and in association with the beam modification command, the reference signal using at least one transmit beam of the set of transmit beams, wherein a first portion of the reference signal is sent in the first set of symbols.

7. The apparatus of claim 6 , wherein the means for sending the reference signal using the at least one transmit beam of the set of transmit beams comprises:

means for sending the first portion of the reference signal in the first set of symbols using a first transmit beam of the set of transmit beams; and

means for sending a second portion of the reference signal in a second set of symbols using a second transmit beam of the set of transmit beams.

8. The apparatus of claim 6 , wherein the beam modification command further indicates a second set of symbol indexes corresponding to a second set of symbols, and at least a second portion of the reference signal is received in the second set of symbols.

9. The apparatus of claim 8 , wherein the beam modification command indicates a first correspondence between a first transmit beam index of the set of transmit beam indexes and the first set of symbol indexes, and the beam modification command indicates a second correspondence between a second transmit beam index of the set of transmit beam indexes and the second set of symbol indexes.

10. The apparatus of claim 6 , further comprising:

means for determining the set of transmit beams to be used for transmitting the reference signal.

11. An apparatus comprising:

a memory; and

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

send, by a base station, a beam modification command that indicates a set of transmit beam indexes corresponding to a set of transmit beams associated with the base station and indicates a first set of symbol indexes corresponding to a first set of symbols of a reference signal, 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, wherein the beam modification command is included in one of a medium access control element (MAC) control element (CE) or a downlink control information (DCI) message, and wherein the reference signal comprises a channel-state information reference signal (CSI-RS); and

send, by a base station and in association with the beam modification command, the reference signal using at least one transmit beam of the set of transmit beams, wherein a first portion of the reference signal is sent in the first set of symbols.

12. The apparatus of claim 11 , wherein the at least one processor configured to send the reference signal using the at least one transmit beam of the set of transmit beams is configured to:

send the first portion of the reference signal in the first set of symbols using a first transmit beam of the set of transmit beams; and

send a second portion of the reference signal in a second set of symbols using a second transmit beam of the set of transmit beams.

13. The apparatus of claim 11 , wherein the beam modification command further indicates a second set of symbol indexes corresponding to a second set of symbols, and at least a second portion of the reference signal is received in the second set of symbols.

14. The apparatus of claim 13 , wherein the beam modification command indicates a first correspondence between a first transmit beam index of the set of transmit beam indexes and the first set of symbol indexes, and the beam modification command indicates a second correspondence between a second transmit beam index of the set of transmit beam indexes and the second set of symbol indexes.

15. The apparatus of claim 11 , wherein the at least one processor is further configured to:

determine the set of transmit beams to be used for transmitting the reference signal.

16. A non-transitory computer-readable medium storing computer-executable code for wireless communication by a base station, comprising code to:

send a beam modification command that indicates a set of transmit beam indexes corresponding to a set of transmit beams associated with the base station and indicates a first set of symbol indexes corresponding to a first set of symbols of a reference signal, 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, wherein the beam modification command is included in one of a medium access control element (MAC) control element (CE) or a downlink control information (DCI) message, and wherein the reference signal comprises a channel-state information reference signal (CSI-RS); and

send, in association with the beam modification command, the reference signal using at least one transmit beam of the set of transmit beams, wherein a first portion of the reference signal is sent in the first set of symbols.