Methods for self-interference and cross-link interference measurements in millimeter wave bands
Methods, systems, and devices for wireless communications are described for self-interference or cross-link interference measurements at a user equipment (UE). A UE may receive configuration information from a base station that indicates one or more slot format index (SFI) values that are compatible for cross-link interference or self-interference measurements. Based on the configured SFI(s), the UE may measure interference in multiple symbols, which may be used to estimate an amount of cross-link interference or self-interference, and the UE may transmit a measurement report to the base station. The base station, based on the measurement report, may identify one or more compatible SFIs, beam pairs, or combinations thereof, for subsequent communications with one or more UEs. The interference measurements may identify cross-link interference at the UE that results from transmissions of a different UE, or may identify self-interference of concurrent communications of multiple channels at a same UE.
1. A method for wireless communication at a base station, comprising:
selecting a first slot format index (SFI) for communications with a first user equipment (UE) via a first carrier and a second SFI for communications with a second UE via a second carrier, wherein the first SFI and the second SFI are selected based at least in part on a compatibility for measuring, at one or more of the first UE or the second UE, interference between the first UE and the second UE;
configuring a first slot format at the first UE with the first SFI and a second slot format at the second UE with the second SFI, wherein:
a first symbol of each of the first SFI and the second SFI are configured to be downlink symbols with each of the first UE and the second UE receiving information from the base station during the first symbol;
a second symbol of the first UE is configured for uplink transmissions from the first UE and the second UE is configured for downlink receptions during the second symbol; and
the second UE is configured to measure interference from concurrent transmissions from the first UE and the base station during the second symbol relative to a baseline case of downlink reception from the base station alone during the first symbol; and
receiving a measurement report for one or more of the first UE or the second UE, the measurement report indicating one or more interference measurements according to the first SFI or the second SFI.
2. The method of claim 1 , further comprising:
configuring either the uplink transmissions or the downlink receptions in the first or the second symbols at the first or the second UE via a reconfiguration of a flexible or a gap symbol; and
wherein the measurement report indicates a cross-link interference measurement of the first UE based at least in part on a difference in measurements between the first symbol and the second symbol.
3. The method of claim 1 , wherein
beamforming parameters of the first UE and the second UE are configured to be the same at least during portions of the first SFI and the second SFI that are to be used for measuring cross-link interference between the first UE and the second UE.
4. The method of claim 1 , wherein a number of symbols or slots over which the first SFI and the second SFI are configured for cross-link interference measurements is based at least in part on a sub-carrier spacing (SCS) of the first UE or the second UE.
5. The method of claim 1 , wherein a number of symbols or slots over which the first SFI and the second SFI are configured for cross-link interference measurements is based at least in part on an interference estimation quality associated with the measurement report.
6. The method of claim 5 , wherein the interference estimation quality is a band-specific, bandwidth part-specific, or link-specific estimation quality.
7. The method of claim 1 , wherein a power level at the first UE is configured based at least in part on the first SFI being selected for compatibility for measuring interference between the first UE and the second UE.
8. The method of claim 1 , further comprising:
receiving, from one or more of the first UE or the second UE, a request to perform an interference measurement for one or more SFIs, and wherein the selecting and the configuring are performed responsive to the request.
9. The method of claim 8 , wherein the measurement report is received from the second UE and provides one or more of an indication of a set of compatible SFIs based on interference measurements at the second UE, a first interference estimate associated with a first symbol of a slot during which the first UE does not transmit, a second interference estimate associated with a second symbol of the slot during which the first UE transmits an uplink communication, or any combinations thereof.
10. The method of claim 1 , wherein the first UE and the second UE are a same UE, and wherein the first carrier uses a first frequency band and the second carrier uses a second frequency band that is different than the first frequency band.
11. A method for wireless communication at a second user equipment (UE), comprising:
receiving, from a base station, configuration information that indicates a first slot format index (SFI) for communications via a first carrier, and that indicates at least a first measurement symbol and a second measurement symbol within the indicated SFI; and
transmitting a measurement report to the base station that provides one or more of a first interference measurement, a second interference measurement, an indication of a set of compatible SFIs based at least in part on a first interference estimate and a second interference estimate, or any combinations thereof, wherein the first interference estimate is based at least in part on the first interference measurement during the first measurement symbol and the second interference estimate is based at least in part on the second interference measurement during the second measurement symbol, wherein:
the first measurement symbol is configured to be a downlink symbol for receiving information at the second UE from the base station during the first measurement symbol;
the second measurement symbol is configured for uplink transmissions at a first UE and is configured to be a downlink symbol for receiving information from the base station at the second UE; and
the measurement report indicates interference from concurrent transmissions from the first UE and the base station during the second measurement symbol relative to a baseline case of downlink reception from the base station alone during the first measurement symbol.
12. The method of claim 11 , further comprising:
receiving, from the base station, further configuration information that configures either the uplink transmissions or downlink receptions in the first or the second measurement symbols via a reconfiguration of a flexible or a gap symbol; and
wherein the measurement report indicates a cross-link interference measurement of the UE based at least in part on a difference in measurements between the first measurement symbol and the second measurement symbol.
13. The method of claim 11 , wherein
receive beamforming parameters of the second UE are configured to be the same at least during the first measurement symbol and the second measurement symbol.
14. The method of claim 11 , wherein the measurement report indicates one or more of a set of SFIs that are compatible for communications with the second UE, a set of beam pairs that are compatible for communications with the second UE, or any combinations thereof.
15. The method of claim 11 , wherein a number of symbols or slots over which the first SFI is configured for cross-link measurements is based at least in part on a sub-carrier spacing (SCS) of the second UE.
16. The method of claim 11 , wherein a number of symbols or slots over which the first SFI is configured for cross-link measurements is based at least in part on an interference estimation quality associated with the measurement report.
17. The method of claim 16 , wherein the interference estimation quality is a band-specific, bandwidth part-specific or link-specific estimation quality.
18. The method of claim 11 , further comprising:
transmitting a request to the base station to perform an interference measurement for one or more slot formats, and wherein the configuration information is received responsive to the request.
19. An apparatus for wireless communication at a base station, comprising:
at least one processor; and
at least one memory coupled with the at least one processor, the at least one memory comprising instructions executable by the at least one processor to cause the apparatus to:
select a first slot format index (SFI) for communications with a first user equipment (UE) via a first carrier and a second SFI for communications with a second UE via a second carrier, wherein the first SFI and the second SFI are selected based at least in part on a compatibility for measuring, at one or more of the first UE or the second UE, interference between the first UE and the second UE;
configure a first slot format at the first UE with the first SFI and a second slot format at the second UE with the second SFI, wherein:
a first symbol of each of the first SFI and the second SFI are configured to be downlink symbols with each of the first UE and the second UE receiving information from the base station during the first symbol;
a second symbol of the first UE is configured for uplink transmissions from the first UE and the second UE is configured for downlink receptions during the second symbol; and
the second UE is configured to measure interference from concurrent transmissions from the first UE and the base station during the second symbol relative to a baseline case of downlink reception from the base station alone during the first symbol; and
receive a measurement report for one or more of the first UE or the second UE, the measurement report indicating one or more interference measurements according to the first SFI or the second SFI.
20. The apparatus of claim 19 , wherein the instructions are further executable by the at least one processor to cause the apparatus to:
configure either the uplink transmissions or the downlink receptions in the first or the second symbols at the first or the second UE via a reconfiguration of a flexible or a gap symbol; and
wherein the measurement report indicates a cross-link interference measurement of the first UE based at least in part on a difference in measurements between the first symbol and the second symbol.
21. The apparatus of claim 19 , wherein beamforming parameters of the first UE and the second UE are configured to be the same at least during portions of the first SFI and the second SFI that are to be used for measuring cross-link interference between the first UE and the second UE.
22. The apparatus of claim 19 , wherein a number of symbols or slots over which the first SFI and the second SFI are configured for cross-link interference measurements is based at least in part on a sub-carrier spacing (SCS) of the first UE or the second UE.
23. The apparatus of claim 19 , wherein a number of symbols or slots over which the first SFI and the second SFI are configured for cross-link interference measurements is based at least in part on an interference estimation quality associated with the measurement report.
24. An apparatus for wireless communication at a second user equipment (UE), comprising:
at least one processor; and
at least one memory coupled with the at least one processor, the at least one memory comprising instructions executable by the at least one processor to cause the apparatus to:
receive, from a base station, configuration information that indicates a first slot format index (SFI) for communications via a first carrier, and that indicates at least a first measurement symbol and a second measurement symbol within the indicated SFI; and
transmit a measurement report to the base station that provides one or more of a first interference measurement, a second interference measurement, an indication of a set of compatible SFIs based at least in part on a first interference estimate and a second interference estimate, or any combinations thereof, wherein the first interference estimate is based at least in part on the first interference measurement during the first measurement symbol and the second interference estimate is based at least in part on the second interference measurement during the second measurement symbol, wherein:
the first measurement symbol is configured to be a downlink symbol for receiving information at the second UE from the base station during the first measurement symbol;
the second measurement symbol is configured for uplink transmissions at a first UE and is configured to be a downlink symbol for receiving information from the base station at the second UE; and
the measurement report indicates interference from concurrent transmissions from the first UE and the base station during the second measurement symbol relative to a baseline case of downlink reception from the base station alone during the first measurement symbol.
25. The apparatus of claim 24 , wherein the instructions are further executable by the at least one processor to cause the apparatus to:
receive, from the base station, further configuration information that configures either the uplink transmissions or downlink receptions in the first or the second measurement symbols via a reconfiguration of a flexible or a gap symbol; and
wherein the measurement report indicates a cross-link interference measurement of the UE based at least in part on a difference in measurements between the first measurement symbol and the second measurement symbol.
26. The apparatus of claim 24 , wherein receive beamforming parameters of the second UE are configured to be the same at least during the first measurement symbol and the second measurement symbol.