Sounding reference signal resource set configuration for analog channel state feedback
Various aspects of the present disclosure generally relate to wireless communication. In some aspects, a user equipment (UE) may receive a configuration that indicates a sounding reference signal (SRS) resource set to be used for analog channel state feedback (CSF) and an association between the SRS resource set and a set of downlink channel state information reference signals (CSI-RSs). The UE may measure the set of downlink CSI-RSs associated with the SRS resource set. The UE may transmit one or more SRSs for analog CSF using the SRS resource set and based at least in part on measuring the set of downlink CSI-RSs. Numerous other aspects are provided.
1. A method of wireless communication performed by a user equipment (UE), comprising:
receiving a configuration that indicates a sounding reference signal (SRS) resource set to be used for analog channel state feedback (CSF) and an association between the SRS resource set and a set of downlink channel state information reference signals (CSI-RSs), the configuration comprising a spatial relation information parameter that includes a CSI-RS index value identifying the set of downlink CSI-RSs;
measuring the set of downlink CSI-RSs associated with the SRS resource set; and
transmitting one or more SRSs for analog CSF using the SRS resource set and based at least in part on measuring the set of downlink CSI-RSs.
2. The method of claim 1 , wherein the SRS resource set is indicated using an analog CSF SRS usage that is different from a beam management SRS usage, a codebook SRS usage, a non-codebook SRS usage, and an antenna switching SRS usage.
3. The method of claim 2 , wherein the SRS resource set is configured as an aperiodic SRS resource set, a semi-persistent SRS resource set, or a periodic SRS resource set in accordance with the analog CSF usage.
4. The method of claim 1 , wherein the set of downlink CSI-RSs is a set of non-zero power (NZP) CSI-RSs, and wherein the one or more SRSs are transmitted using a spatial domain transmission filter determined based at least in part on measuring the set of NZP CSI-RSs.
5. The method of claim 1 , wherein all SRS resources included in the SRS resource set are associated with the set of downlink CSI-RSs, wherein the SRS resource set is one of multiple SRS resource sets configured to be used for analog CSF, and wherein different SRS resource sets, of the multiple SRS resource sets, are associated with different sets of CSI-RSs.
6. The method of claim 1 , wherein the association is indicated using either a CSI-RS parameter or an associated CSI-RS parameter in an SRS resource set field of the configuration.
7. The method of claim 1 , wherein the association is indicated using the spatial relation information parameter, and wherein the spatial relation information parameter is in an SRS resource set field of the configuration.
8. The method of claim 1 , wherein the SRS resource set is indicated using an antenna switching SRS usage for the SRS resource set.
9. The method of claim 8 , wherein the SRS resource set is used for analog CSF when the antenna switching SRS usage is indicated in either a CSI-RS parameter or an associated CSI-RS parameter in a resource type field of an SRS resource set field of the configuration.
10. The method of claim 1 , wherein the one or more SRSs are transmitted using a same transmit power for each SRS port used to transmit the one or more SRSs.
11. The method of claim 1 , wherein the one or more SRSs are transmitted using different transmit powers for different SRS ports used to transmit the one or more SRSs.
12. The method of claim 11 , wherein a transmit power for an SRS port is scaled based at least in part on a set of singular values of measurement determined based at least in part on measuring the set of downlink CSI-RSs.
13. A method of wireless communication performed by a network entity, comprising:
transmitting a configuration that indicates a sounding reference signal (SRS) resource set to be used for analog channel state feedback (CSF) and an association between the SRS resource set and a set of downlink channel state information reference signals (CSI-RSs), the configuration comprising a spatial relation information parameter that includes a CSI-RS index value identifying the set of downlink CSI-RSs;
transmitting the set of downlink CSI-RSs;
receiving one or more SRSs for analog CSF in the SRS resource set based at least in part on transmitting the set of downlink CSI-RSs; and
determining a precoding matrix indicator (PMI) value based at least in part on the one or more SRSs.
14. The method of claim 13 , wherein the SRS resource set is indicated using an analog CSF SRS usage that is different from a beam management SRS usage, a codebook SRS usage, a non-codebook SRS usage, and an antenna switching SRS usage.
15. The method of claim 13 , wherein the set of downlink CSI-RSs is a set of non-zero power (NZP) CSI-RSs, and wherein the PMI value is determined based at least in part on a spatial domain transmission filter associated with the set of NZP CSI-RSs.
16. The method of claim 13 , wherein all SRS resources included in the SRS resource set are associated with the set of downlink CSI-RSs, wherein the SRS resource set is one of multiple SRS resource sets configured to be used for analog CSF, and wherein different SRS resource sets, of the multiple SRS resource sets, are associated with different sets of CSI-RSs.
17. The method of claim 13 , wherein the association is indicated using either a CSI-RS parameter or an associated CSI-RS parameter in an SRS resource set field of the configuration.
18. The method of claim 13 , wherein the association is indicated using the spatial relation information parameter, and wherein the spatial relation information parameter is in an SRS resource set field of the configuration.
19. The method of claim 13 , wherein the SRS resource set is indicated using an antenna switching SRS usage for the SRS resource set.
20. The method of claim 19 , wherein the SRS resource set is used for analog CSF when the antenna switching SRS usage is indicated in either a CSI-RS parameter or an associated CSI-RS parameter in a resource type field of an SRS resource set field of the configuration.
21. A user equipment (UE) for wireless communication, comprising:
one or more memories; and
one or more processors coupled to the one or more memories, the one or more processors configured to:
receive a configuration that indicates a sounding reference signal (SRS) resource set to be used for analog channel state feedback (CSF) and an association between the SRS resource set and a set of downlink channel state information reference signals (CSI-RSs), the configuration comprising a spatial relation information parameter that includes a CSI-RS index value identifying the set of downlink CSI-RSs;
measure the set of downlink CSI-RSs associated with the SRS resource set; and
transmit one or more SRSs for analog CSF using the SRS resource set and based at least in part on measuring the set of downlink CSI-RSs.
22. The UE of claim 21 , wherein the SRS resource set is indicated using an analog CSF SRS usage that is different from a beam management SRS usage, a codebook SRS usage, a non-codebook SRS usage, and an antenna switching SRS usage.
23. The UE of claim 21 , wherein the set of downlink CSI-RSs is a set of non-zero power (NZP) CSI-RSs, and wherein the one or more SRSs are transmitted using a spatial domain transmission filter determined based at least in part on measuring the set of NZP CSI-RSs.
24. The UE of claim 21 , wherein all SRS resources included in the SRS resource set are associated with the set of downlink CSI-RSs, wherein the SRS resource set is one of multiple SRS resource sets configured to be used for analog CSF, and wherein different SRS resource sets, of the multiple SRS resource sets, are associated with different sets of CSI-RSs.
25. The UE of claim 21 , wherein the association is indicated using either a CSI-RS parameter or an associated CSI-RS parameter in an SRS resource set field of the configuration.
26. The UE of claim 21 , wherein a transmit power for the one or more SRSs is based at least in part on a set of singular value decomposition values determined based at least in part on the set of downlink CSI-RSs.
27. A network entity for wireless communication, comprising:
a one or more memories; and
one or more processors coupled to the one or more memories, the one or more processors configured to:
transmit a configuration that indicates a sounding reference signal (SRS) resource set to be used for analog channel state feedback (CSF) and an association between the SRS resource set and a set of downlink channel state information reference signals (CSI-RSs), the configuration comprising a spatial relation information parameter that includes a CSI-RS index value identifying the set of downlink CSI-RSs;
transmit the set of downlink CSI-RSs;
receive one or more SRSs for analog CSF in the SRS resource set based at least in part on transmitting the set of downlink CSI-RSs; and
determine a precoding matrix indicator (PMI) value based at least in part on the one or more SRSs.
28. The network entity of claim 27 , wherein the SRS resource set is indicated using an analog CSF SRS usage that is different from a beam management SRS usage, a codebook SRS usage, a non-codebook SRS usage, and an antenna switching SRS usage.
29. The network entity of claim 27 , wherein the set of downlink CSI-RSs is a set of non-zero power (NZP) CSI-RSs, and wherein the PMI value is determined based at least in part on a spatial domain transmission filter associated with the set of NZP CSI-RSs.
30. The network entity of claim 27 , wherein all SRS resources included in the SRS resource set are associated with the set of downlink CSI-RSs, wherein the SRS resource set is one of multiple SRS resource sets configured to be used for analog CSF, and wherein different SRS resource sets, of the multiple SRS resource sets, are associated with different sets of CSI-RSs.