Beam determination during a reference signal transmission
Certain aspects of the disclosure provide techniques for a user equipment (UE) to determine a receive beam of a plurality of receive beams for receiving an upcoming transmission from a base station, wherein the determining is based on whether an indication is received from the base station indicating if the upcoming transmission includes a reference signal (RS) multiplexed with additional data. The techniques further provide for the UE to receive the upcoming transmission using the determined receive beam.
1. A method for wireless communication by a user equipment (UE), comprising:
determining a receive beam of a plurality of receive beams for receiving an upcoming transmission from a base station, wherein the determining is based on whether an indication is received from the base station indicating if the upcoming transmission includes a reference signal (RS) multiplexed with additional data; and
receiving the upcoming transmission using the determined receive beam.
2. The method of claim 1 , wherein the determining further comprises:
determining that the indication is not received from the base station; and
selecting the receive beam from the plurality of receive beams based on one or more measurements performed using the plurality of receive beams.
3. The method of claim 1 , further comprising receiving the indication from the base station.
4. The method of claim 3 , wherein the determining further comprises:
selecting the receive beam from the plurality of receive beams based on the UE being configured to use a particular receive beam for receiving a type of signal corresponding to the additional data.
5. The method of claim 4 , wherein the particular receive beam is a previously selected receive beam of the plurality of receive beams based on one or more measurements performed using the plurality of receive beams, and wherein the one or more measurements are performed on a previously received RS.
6. The method of claim 5 , wherein the particular receive beam is the previously selected receive beam only when the one or more measurements include a measurement for the particular receive beam, and the measurement for the particular receive beam is reported by the UE to the base station.
7. The method of claim 4 , wherein the particular receive beam is a default beam for receiving the additional data or is indicated in downlink control information received from the base station.
8. The method of claim 1 , wherein the determining is based on whether the indication is received at least a first time period prior to the upcoming transmission.
9. The method of claim 1 , wherein the additional data comprises a physical downlink shared channel (PDSCH), and wherein the indication comprises a PDSCH grant.
10. The method of claim 1 , wherein the RS comprises at least one of a synchronization signal block and a channel state information reference signal.
11. The method of claim 1 , wherein the additional data comprises a physical downlink shared channel (PDSCH), and further comprising determining that the indication is not received from the base station based on receiving a PDSCH grant after a first time period prior to the upcoming transmission and one of:
receiving the PDSCH at a different time period than the RS; or
not receiving the PDSCH.
12. The method of claim 11 , wherein the PDSCH is multiplexed with the RS using time division multiplexing.
13. A user equipment (UE) comprising:
a memory; and
a processor coupled to the memory, the processor being configured to:
determine a receive beam of a plurality of receive beams for receiving an upcoming transmission from a base station, wherein the determining is based on whether an indication is received from the base station indicating if the upcoming transmission includes a reference signal (RS) multiplexed with additional data; and
receive the upcoming transmission using the determined receive beam.
14. The UE of claim 13 , wherein the determining further comprises:
determining that the indication is not received from the base station; and
selecting the receive beam from the plurality of receive beams based on one or more measurements performed using the plurality of receive beams.
15. The UE of claim 13 , wherein the processor is further configured to receive the indication from the base station.
16. The UE of claim 15 , wherein the determining further comprises:
selecting the receive beam from the plurality of receive beams based on the UE being configured to use a particular receive beam for receiving a type of signal corresponding to the additional data.
17. The UE of claim 16 , wherein the particular receive beam is a previously selected receive beam of the plurality of receive beams based on one or more measurements performed using the plurality of receive beams, and wherein the one or more measurements are performed on a previously received RS.
18. The UE of claim 17 , wherein the particular receive beam is the previously selected receive beam only when the one or more measurements include a measurement for the particular receive beam, and the measurement for the particular receive beam is reported by the UE to the base station.
19. The UE of claim 16 , wherein the particular receive beam is a default beam for receiving the additional data or is indicated in downlink control information received from the base station.
20. The UE of claim 13 , wherein the determining is based on whether the indication is received at least a first time period prior to the upcoming transmission.
21. The UE of claim 13 , wherein the additional data comprises a physical downlink shared channel (PDSCH), and wherein the indication comprises a PDSCH grant.
22. The UE of claim 13 , wherein the RS comprises at least one of a synchronization signal block and a channel state information reference signal.
23. The UE of claim 13 , wherein the additional data comprises a physical downlink shared channel (PDSCH), and wherein the processor is further configured to determine that the indication is not received from the base station based on receiving a PDSCH grant after a first time period prior to the upcoming transmission and one of:
receive the PDSCH at a different time period than the RS; or
not receive the PDSCH.
24. The UE of claim 23 , wherein the PDSCH is multiplexed with the RS using time division multiplexing.
25. A user equipment (UE) comprising:
means for determining a receive beam of a plurality of receive beams for receiving an upcoming transmission from a base station, wherein the determining is based on whether an indication is received from the base station indicating if the upcoming transmission includes a reference signal (RS) multiplexed with additional data; and
means for receiving the upcoming transmission using the determined receive beam.
26. The UE of claim 25 , further comprising means for receiving the indication from the base station.
27. The UE of claim 26 , wherein the means for determining further comprises:
means for selecting the receive beam from the plurality of receive beams based on the UE being configured to use a particular receive beam for receiving a type of signal corresponding to the additional data.
28. A non-transitory computer readable storage medium that stores instructions that when executed by a user equipment (UE) causes the UE to perform a method for wireless communication, the method comprising:
determining a receive beam of a plurality of receive beams for receiving an upcoming transmission from a base station, wherein the determining is based on whether an indication is received from the base station indicating if the upcoming transmission includes a reference signal (RS) multiplexed with additional data; and
receiving the upcoming transmission using the determined receive beam.
29. The non-transitory computer readable storage medium of claim 28 , wherein the method further comprises receiving the indication from the base station.
30. The non-transitory computer readable storage medium of claim 29 , wherein the determining further comprises:
selecting the receive beam from the plurality of receive beams based on the UE being configured to use a particular receive beam for receiving a type of signal corresponding to the additional data.