Estimating features of a radio frequency band based on an inter-band reference signal

1. A method of wireless communication, by a user equipment (UE), comprising:

receiving, from a first transmission and reception point (TRP) operating in a first band, a system information block (SIB) including assistance information indicating a first cell identifier (ID) associated with a second TRP operating in a second band is collocated with a communication node operating in the first band, the communication node being associated with a second cell ID, the first TRP and the second TRP being non-collocated;

receiving, from the first TRP, configuration information for one or more reference signals (RSs) associated with the first band, the one or more RSs being transmitted from the UE to the communication node or received at the UE from the communication node; and

communicating with the second TRP based on one or more features of the second band, the one or more features being estimated based on measurements of the one or more RSs in the first band, the one or more features including at least a channel characteristic, a received signal power, or a beam direction.

2. The method of claim 1 , further comprising:

transmitting, to the communication node, an on-demand RS request soliciting the communication node to transmit the one or more RSs to the UE in the first band;

receiving, from the communication node, the one or more RSs in the first band in response to the on-demand RS request;

estimating the one or more features of the second band based on measurements of the one or more RSs;

transmitting a message indicating the one or more estimated features to the first TRP or to the second TRP; and

receiving a downlink signal in the second band from the second TRP based on transmitting the message indicating the one or more estimated features to the first TRP or to the second TRP.

3. The method of claim 2 , in which the one or more RSs comprises one of channel state information-RSs (CSI-RSs), synchronization signal block (SSBs), or pathloss (PL) RSs.

4. The method of claim 1 , further comprising:

receiving, from the communication node, an on-demand RS request soliciting the UE to transmit the one or more RSs to the communication node;

transmitting the one or more RSs to the communication node in the first band; and

receiving a downlink signal in the second band from the second TRP based on transmitting the one or more RSs.

5. The method of claim 1 , further comprising:

receiving, from the first TRP, a triggering signal; and

transmitting the one or more RSs in the first band to the communication node in response to receiving the triggering signal.

6. The method of claim 5 , in which:

the triggering signal comprises downlink control information; and

the one or more RSs comprise sounding reference signals (SRSs).

7. The method of claim 1 , further comprising:

receiving the one or more RSs in the first band from the communication node;

identifying the one or more RSs from the communication node based on the assistance information;

measuring the one or more RSs;

estimating the one or more features of the second band based on the measurements of the one or more RSs; and

receiving a downlink signal in the second band from the second TRP based on receiving the one or more RSs, one or both of a beam or a channel of the second band having been adjusted based on the one or more received RSs.

8. The method of claim 1 , in which a second physical location of the communication node is the same as a first physical location of the second TRP.

9. The method of claim 1 , in which a second physical location of the communication node is less than a threshold distance from a first physical location of the second TRP.

10. The method of claim 1 , further comprising:

receiving, from the communication node, training signals in the first band; and

training a machine learning model to estimate the one or more features of the second band based on the received training signals.

11. The method of claim 1 , in which the first band is within a first frequency range and the second band is within a second frequency range.

12. The method of claim 1 , wherein the first TRP operates according to a first radio access technology (RAT) and the second TRP operates according to a second RAT.

13. The method of claim 1 , in which the communication node is a dedicated receiver, a dedicated transmitter, or a reduced functionality transceiver.

14. An apparatus for wireless communications at a user equipment (UE), comprising:

at least one processor;

at least one memory coupled with the at least one processor; and

instructions stored in the at least one memory and operable, when executed by the at least one processor, to cause the apparatus:

to receive, from a first transmission and reception point (TRP) operating in a first band, a system information block (SIB) including assistance information indicating a first cell identifier (ID) associated with a second TRP operating in a second band is collocated with a communication node operating in the first band, the communication node being associated with a second cell ID, the first TRP and the second TRP being non-collocated;

to receive, from the first TRP, configuration information for one or more reference signals (RSs) associated with the first band, the one or more RSs being transmitted from the UE to the communication node or received at the UE from the communication node; and

to communicate with the second TRP based on one or more features of the second band, the one or more features being estimated based on measurements of the one or more RSs in the first band, the one or more features including at least a channel characteristic, a received signal power, or a beam direction.

15. The apparatus of claim 14 , in which execution of the instructions further cause the apparatus:

to transmit, to the communication node, an on-demand RS request soliciting the communication node to transmit the one or more RSs to the UE in the first band;

to receive, from the communication node, the one or more RSs in the first band in response to the on-demand RS request;

to estimate the one or more features of the second band based on measurements of the one or more RSs;

to transmit a message indicating the one or more estimated features to the first TRP or to the second TRP; and

to receive a downlink signal in the second band from the second TRP based on transmitting the message indicating the one or more estimated features to the first TRP or to the second TRP.

16. The apparatus of claim 15 , in which the one or more RSs comprises one of channel state information-RSs (CSI-RSs), synchronization signal block (SSBs), or pathloss (PL) RSs.

17. The apparatus of claim 14 , in which execution of the instructions further cause the apparatus:

to receive, from the communication node, an on-demand RS request soliciting the UE to transmit the one or more RSs to the communication node;

to transmit the one or more RSs to the communication node in the first band; and

to receive a downlink signal in the second band from the second TRP based on transmitting the one or more RSs.

18. The apparatus of claim 14 , in which execution of the instructions further cause the apparatus:

to receive, from the first TRP, a triggering signal; and

to transmit the one or more RSs in the first band to the communication node in response to receiving the triggering signal.

19. The apparatus of claim 18 , in which:

the triggering signal comprises downlink control information; and

the one or more RSs comprise sounding reference signals (SRSs).

20. The apparatus of claim 14 , in which execution of the instructions further cause the apparatus:

to receive the one or more RSs in the first band from the communication node;

to identify the one or more RSs from the communication node based on the assistance information;

to measure the one or more RSs;

to estimate the one or more features of the second band based on the measurements of the one or more RSs; and

to receive a downlink signal in the second band from the second TRP based on receiving the one or more RSs, one or both of a beam or a channel of the second band having been adjusted based on the one or more received RSs.

21. The apparatus of claim 14 , in which a second physical location of the communication node is the same as a first physical location of the second TRP.

22. The apparatus of claim 14 , in which a second physical location of the communication node is less than a threshold distance from a first physical location of the second TRP.

23. The apparatus of claim 14 , in which execution of the instructions further cause the apparatus:

to receive, from the communication node, training signals in the first band; and

to train a machine learning model to estimate the one or more features of the second band based on the received training signals.

24. The apparatus of claim 14 , in which the first band is within a first frequency range and the second band is within a second frequency range.

25. The apparatus of claim 14 , wherein the first TRP operates according to a first radio access technology (RAT) and the second TRP operates according to a second RAT.

26. The apparatus of claim 14 , in which the communication node is a dedicated receiver, a dedicated transmitter, or a reduced functionality transceiver.