Coexistence of new radio sounding reference signal (NR-SRS) and long-term evolution (LTE) communications
Various aspects of the present disclosure generally relate to wireless communication. In some aspects, a user equipment (UE) may identify one or more symbols, associated with downlink communication of a first radio access technology (RAT), that are Impacted by antenna switching used to transmit an uplink reference signal of a second RAT. The UE may perform a mitigation action to mitigate downlink performance degradation associated with the first RAT based at least in part on identifying the one or more symbols. Numerous other aspects are described.
1. A method of wireless communication performed by a user equipment (UE), comprising:
identifying one or more symbols, associated with downlink communication of a first radio access technology (RAT), that are impacted by antenna switching used to transmit an uplink reference signal of a second RAT; and
performing a mitigation action to mitigate downlink performance degradation associated with the first RAT based at least in part on identifying the one or more symbols,
wherein performing the mitigation action to mitigate downlink performance degradation comprises at least one of:
modifying a first channel estimate that is based at least in part on the one or more symbols, or
generating a second channel estimate using at least one of prediction, interpolation, or extrapolation and without using samples from the one or more symbols.
2. The method of claim 1 , further comprising identifying one or more antennas impacted by the antenna switching used to transmit the uplink reference signal of the second RAT; and
wherein performing the mitigation action further comprises performing the mitigation action for the one or more antennas.
3. The method of claim 1 , wherein performing the mitigation action to mitigate downlink performance degradation further comprises blanking one or more samples received in the one or more symbols.
4. The method of claim 1 , wherein modifying the first channel estimate comprises modifying one or more weights assigned to one or more time domain interpolation coefficients, used to generate the first channel estimate, associated with the one or more symbols.
5. The method of claim 4 , wherein the one or more weights are each set to zero.
6. The method of claim 1 , wherein performing the mitigation action to mitigate downlink performance degradation further comprises refraining from estimating noise in the one or more symbols.
7. The method of claim 6 , wherein the one or more symbols include at least one cell-specific reference signal (CRS) symbol; and
wherein refraining from estimating noise in the one or more symbols comprises refraining from estimating noise in the at least one CRS symbol.
8. The method of claim 1 , wherein the one or more symbols include at least one cell-specific reference signal (CRS) symbol; and
wherein the second channel estimate is generated based at least in part on a determination that the one or more symbols include the at least one CRS symbol.
9. The method of claim 1 , further comprising identifying the mitigation action to be performed based at least in part on whether the one or more symbols include a cell-specific reference signal symbol.
10. The method of claim 1 , wherein performing the mitigation action to mitigate downlink performance degradation further comprises at least one of:
performing a first mitigation action to mitigate downlink performance degradation in one or more data symbols of the one or more symbols, or
performing a second mitigation action to mitigate downlink performance degradation in one or more cell-specific reference signal symbols of the one or more symbols.
11. The method of claim 1 , wherein the UE is configured to communicate in a dual connectivity mode associated with the first RAT and the second RAT.
12. A user equipment (UE) for wireless communication, comprising:
one or more memories; and
one or more processors operatively coupled to the one or more memories, the one or more processors configured to:
identify one or more symbols, associated with downlink communication of a first radio access technology (RAT), that are impacted by antenna switching used to transmit an uplink reference signal of a second RAT; and
perform a mitigation action to mitigate downlink performance degradation associated with the first RAT based at least in part on identifying the one or more symbols,
wherein the one or more processors, to perform the mitigation action to mitigate downlink performance degradation, are configured to at least one of:
modify a first channel estimate that is based at least in part on the one or more symbols, or
generate a second channel estimate using at least one of prediction, interpolation, or extrapolation and without using samples from the one or more symbols.
13. The UE of claim 12 , wherein the one or more processors are further configured to identify one or more antennas impacted by the antenna switching used to transmit the second RAT; and
wherein the one or more processors, to perform the mitigation action, are configured to perform the mitigation action for the one or more antennas.
14. The UE of claim 12 , wherein the one or more processors, to perform the mitigation action to mitigate downlink performance degradation, are configured to blank one or more samples received in the one or more symbols.
15. The UE of claim 12 , wherein the one or more processors, to modify the first channel estimate, are configured to modify one or more weights assigned to one or more time domain interpolation coefficients, used to generate the first channel estimate, associated with the one or more symbols.
16. The UE of claim 15 , wherein the one or more weights are each set to zero.
17. The UE of claim 12 , wherein the one or more processors, to perform the mitigation action to mitigate downlink performance degradation, are configured to refrain from estimating noise in the one or more symbols.
18. The UE of claim 17 , wherein the one or more symbols include at least one cell-specific reference signal (CRS) symbol; and
wherein the one or more processors, to refrain from estimating noise in the one or more symbols, are configured to refrain from estimating noise in the at least one CRS symbol.
19. The UE of claim 14 , wherein the one or more symbols include at least one cell-specific reference signal (CRS) symbol; and
wherein the second channel estimate is generated based at least in part on a determination that the one or more symbols include the at least one CRS symbol.
20. The UE of claim 12 , wherein the one or more processors are further configured to identify the mitigation action to be performed based at least in part on whether the one or more symbols include a cell-specific reference signal symbol.
21. The UE of claim 12 , wherein the one or more processors, to perform the mitigation action to mitigate downlink performance degradation, are further configured to:
perform a first mitigation action to mitigate downlink performance degradation in one or more data symbols of the one or more symbols,
perform a second mitigation action to mitigate downlink performance degradation in one or more cell-specific reference signal symbols of the one or more symbols, or
a combination thereof.
22. The UE of claim 12 , wherein the UE is configured to communicate in a dual connectivity mode associated with the first RAT and the second RAT.
23. A non-transitory computer-readable medium storing a set of instructions for wireless communication, the set of instructions comprising:
one or more instructions that, when executed by one or more processors of a user equipment (UE), cause the UE to:
identify one or more symbols, associated with downlink communication of a first radio access technology (RAT), that are impacted by antenna switching used to transmit an uplink reference signal of a second RAT using antenna switching; and
perform a mitigation action to mitigate downlink performance degradation associated with the first RAT based at least in part on identifying the one or more symbols,
wherein the one or more instructions, that cause the UE to perform the mitigation action to mitigate downlink performance degradation, cause the UE to at least one of:
modify a first channel estimate that is based at least in part on the one or more symbols, or
generate a second channel estimate using at least one of prediction, interpolation, or extrapolation and without using samples from the one or more symbols.
24. The non-transitory computer-readable medium of claim 23 ,
wherein the one or more instructions further cause the UE to identify one or more antennas impacted by the antenna switching used to transmit the uplink reference signal of the second RAT; and
wherein the one or more instructions, that cause the UE to perform the mitigation action, cause the UE to perform the mitigation action for the one or more antennas.
25. The non-transitory computer-readable medium of claim 23 , wherein the one or more instructions, that cause the UE to perform the mitigation action to mitigate downlink performance degradation, further cause the UE to at least one of:
blank one or more samples received in the one or more symbols, or
refrain from estimating noise in the one or more symbols.
26. The non-transitory computer-readable medium of claim 23 , wherein the one or more instructions, that cause the UE to modify the first channel estimate, further cause the UE to modify one or more weights assigned to one or more time domain interpolation coefficients, used to generate the first channel estimate, associated with the one or more symbols.
27. The non-transitory computer-readable medium of claim 26 , wherein the one or more weights are each set to zero.
28. The non-transitory computer-readable medium of claim 23 , wherein the one or more symbols include at least one cell-specific reference signal (CRS) symbol; and
wherein the one or more instructions, that cause the UE to generate the second channel estimate, further cause the UE to generate the second channel estimate based at least in part on a determination that the one or more symbols include the at least one CRS symbol.
29. The non-transitory computer-readable medium of claim 23 , wherein the one or more instructions further cause the UE to identify the mitigation action to be performed based at least in part on whether the one or more symbols include a cell-specific reference signal symbol.
30. An apparatus for wireless communication, comprising:
means for identifying one or more symbols, associated with downlink communication of a first radio access technology (RAT), that are impacted by antenna switching used to transmit an uplink reference signal of a second RAT; and
means for performing a mitigation action to mitigate downlink performance degradation associated with the first RAT based at least in part on identifying the one or more symbols,
wherein the means for performing the mitigation action to mitigate downlink performance degradation comprises at least one of:
means for modifying a first channel estimate that is based at least in part on the one or more symbols, or
means for generating a second channel estimate using at least one of prediction, interpolation, or extrapolation and without using samples from the one or more symbols.