Use of uplink beam tracking results in reference symbol sessions
Methods, systems, and devices for wireless communication are described. A network device, such as a base station, may transmit a request message to a user equipment (UE). The request message may include a request for the UE to transmit a set of sounding reference signals (SRSs). The set of SRSs may include two (or more) beamformed signals. The network device may receive the set of SRSs according to the request message. The network device may identify, based on a co-phasing parameter associated with the two (or more) beamformed signals, an antenna port precoder configuration to use for communicating with the UE.
1. A method for wireless communication, comprising:
transmitting a request message to a user equipment (UE), the request message comprising a request for the UE to transmit a set of sounding reference signals (SRSs), the set of SRSs comprising at least two beamformed signals;
receiving the set of SRSs from the UE in accordance with the request message;
identifying, based at least in part on a co-phasing parameter associated with the at least two beamformed signals, an antenna port precoder configuration to be used in a communication with the UE, the co-phasing parameter comprising at least one of a phase shift between the two beamformed signals of the set of SRSs, or an angle of arrival between the two beamformed signals of the set of SRSs, or combinations thereof; and
communicating with the UE using one or more beamformed signals configured according to the antenna port precoder configuration.
2. The method of claim 1 , further comprising:
determining, based at least in part on the co-phasing parameter, a beamforming direction associated with the UE.
3. The method of claim 1 , further comprising:
adjusting at least one of a digital beamforming stage, or an analog beamforming stage, or combinations thereof, according to the identified antenna port precoder configuration.
4. The method of claim 3 , wherein:
the digital beamforming stage comprises at least one of a transmission precoder, or a receiver precoder, or combinations thereof.
5. The method of claim 3 , wherein:
the analog beamforming stage comprises a phase shifter associated with each antenna of an antenna subarray.
6. The method of claim 1 , further comprising:
receiving additional sets of SRSs from the UE over a time period, each set of SRSs comprising at least two beamformed signals; and
updating the identified antenna port precoder configuration based at least in part on the additional sets of SRSs from the UE.
7. An apparatus for wireless communication, comprising:
means for transmitting a request message to a user equipment (UE), the request message comprising a request for the UE to transmit a set of sounding reference signals (SRSs), the set of SRSs comprising at least two beamformed signals;
means for receiving the set of SRSs from the UE in accordance with the request message;
means for identifying, based at least in part on a co-phasing parameter associated with the at least two beamformed signals, an antenna port precoder configuration to be used in a communication with the UE, the co-phasing parameter comprising at least one of a phase shift between the two beamformed signals of the set of SRSs, or an angle of arrival between the two beamformed signals of the set of SRSs, or combinations thereof; and
means for communicating with the UE using one or more beamformed signals configured according to the antenna port precoder configuration.
8. The apparatus of claim 7 , further comprising:
means for determining, based at least in part on the co-phasing parameter, a beamforming direction associated with the UE.
9. The apparatus of claim 7 , further comprising:
means for adjusting at least one of a digital beamforming stage, or an analog beamforming stage, or combinations thereof, according to the identified antenna port precoder configuration.
10. The apparatus of claim 9 , wherein:
the digital beamforming stage comprises at least one of a transmission precoder, or a receiver precoder, or combinations thereof.
11. The apparatus of claim 9 , wherein:
the analog beamforming stage comprises a phase shifter associated with each antenna of an antenna subarray.
12. The apparatus of claim 7 , further comprising:
means for receiving additional sets of SRSs from the UE over a time period, each set of SRSs comprising at least two beamformed signals; and
means for updating the identified antenna port precoder configuration based at least in part on the additional sets of SRSs from the UE.
13. An apparatus for wireless communication, in a system comprising:
a processor;
memory in electronic communication with the processor; and
the processor and memory configured to:
transmit a request message to a user equipment (UE), the request message comprising a request for the UE to transmit a set of sounding reference signals (SRSs), the set of SRSs comprising at least two beamformed signals; receive the set of SRSs from the UE in accordance with the request message;
identify, based at least in part on a co-phasing parameter associated with the at least two beamformed signals, an antenna port precoder configuration to be used in a communication with the UE, the co-phasing parameter comprising at least one of a phase shift between the two beamformed signals of the set of SRSs, or an angle of arrival between the two beamformed signals of the set of SRSs, or combinations thereof; and
communicate with the UE using one or more beamformed signals configured according to the antenna port precoder configuration.
14. The apparatus of claim 13 , wherein the processor and memory are further configured to:
determine, based at least in part on the co-phasing parameter, a beamforming direction associated with the UE.
15. The apparatus of claim 13 , wherein the processor and memory are further configured to:
adjust at least one of a digital beamforming stage, or an analog beamforming stage, or combinations thereof, according to the identified antenna port precoder configuration.
16. The apparatus of claim 15 , wherein:
the digital beamforming stage comprises at least one of a transmission precoder, or a receiver precoder, or combinations thereof.
17. The apparatus of claim 15 , wherein:
the analog beamforming stage comprises a phase shifter associated with each antenna of an antenna subarray.
18. The apparatus of claim 13 , wherein the processor and memory are further configured to:
receive additional sets of SRSs from the UE over a time period, each set of SRSs comprising at least two beamformed signals; and
update the identified antenna port precoder configuration based at least in part on the additional sets of SRSs from the UE.
19. A non-transitory computer readable medium storing code for wireless communication, the code comprising instructions executable by a processor to:
transmit a request message to a user equipment (UE), the request message comprising a request for the UE to transmit a set of sounding reference signals (SRSs), the set of SRSs comprising at least two beamformed signals;
receive the set of SRSs from the UE in accordance with the request message;
identify, based at least in part on a co-phasing parameter associated with the at least two beamformed signals, an antenna port precoder configuration to be used in a communication with the UE, the co-phasing parameter comprising at least one of a phase shift between the two beamformed signals of the set of SRSs, or an angle of arrival between the two beamformed signals of the set of SRSs, or combinations thereof; and
communicate with the UE using one or more beamformed signals configured according to the antenna port precoder configuration.
20. The non-transitory computer-readable medium of claim 19 , wherein the instructions are further executable by the processor to:
determine, based at least in part on the co-phasing parameter, a beamforming direction associated with the UE.
21. The non-transitory computer-readable medium of claim 19 , w herein the instructions are further executable by the processor to:
adjust at least one of a digital beamforming stage, or an analog beamforming stage, or combinations thereof, according to the identified antenna port precoder configuration.
22. The non-transitory computer-readable medium of claim 21 , wherein:
the digital beamforming stage comprises at least one of a transmission precoder, or a receiver precoder, or combinations thereof.
23. The non-transitory computer-readable medium of claim 21 , wherein:
the analog beamforming stage comprises a phase shifter associated with each antenna of an antenna subarray.
24. The method of claim 1 , further comprising:
transmitting an indication of the identified antenna port precoder configuration to the UE, wherein the UE is configured to use the indicated antenna port precoder configuration to configure the one or more beamformed signals.
25. The apparatus of claim 7 , further comprising:
means for transmitting an indication of the identified antenna port precoder configuration to the UE, wherein the UE is configured to use the indicated antenna port precoder configuration to configure the one or more beamformed signals.
26. The apparatus of claim 13 , wherein the processor and memory are further configured to:
transmit an indication of the identified antenna port precoder configuration to the UE, wherein the UE is configured to use the indicated antenna port precoder configuration to configure the one or more beamformed signals.
27. The non-transitory computer-readable medium of claim 19 , wherein the instructions are further executable by the processor to:
transmit an indication of the identified antenna port precoder configuration to the UE, wherein the UE is configured to use the indicated antenna port precoder configuration to configure the one or more beamformed signals.