Adaptive MTI-based RF sensing in cellular systems

1 . An apparatus for wireless communication at a wireless device, comprising:

memory; and

at least one processor coupled to the memory and, based at least in part on information stored in the memory, the at least one processor is configured to:

receive, from a network entity, an indication of clutter information from at least one sensing node or at least one sensor, wherein the clutter information is associated with one or more stationary or slow-moving reflections of one or more signals with respect to the at least one sensing node or the at least one sensor;

configure at least one filter in a set of filters at the wireless device based on the received clutter information from the at least one sensing node or the at least one sensor, wherein the indication of the clutter information comprises assistance data associated with the at least one filter of the wireless device;

perform a radio frequency (RF) sensing measurement for the configured at least one filter of the wireless device; and

transmit, for the network entity, an indication of the RF sensing measurement for the configured at least one filter of the wireless device.

2 . The apparatus of claim 1 , wherein the clutter information includes at least one of:

a power spectral density (PSD) of clutter associated with the clutter information;

a classification of the clutter associated with the clutter information;

a time stamp of the at least one sensing node or the at least one sensor; or

a location of the at least one sensing node or the at least one sensor.

3 . The apparatus of claim 1 , wherein the at least one filter comprises one or more of:

at least one moving target indicator (MTI) filter;

at least one radio frequency (RF) filter; or

at least one baseband filter, wherein the network entity comprises a server or a sensing server, wherein the wireless device comprises a network node, a user equipment (UE), or a base station.

4 . The apparatus of claim 1 , wherein, to receive the indication of clutter information, the at least one processor is configured to:

periodically receive the indication of clutter information comprising the assistance data associated with the at least one filter of the wireless device.

5 . The apparatus of claim 1 , wherein the at least one processor is further configured to:

transmit, for the network entity, a request for the clutter information, wherein, to receive the indication of the clutter information, the at least one processor is configured to:

receive the indication of the clutter information based on the transmitted request.

6 . The apparatus of claim 1 , wherein the indication of the RF sensing measurement for the configured at least one filter includes at least one of:

moving target indicator (MTI) filter information of the configured at least one filter;

an MTI type of the configured at least one filter; or

a frequency response of the configured at least one filter.

7 . The apparatus of claim 1 , wherein the RF sensing measurement for the at least one filter is associated with at least one of:

a Kalman filter;

a machine learning (ML) procedure; or

a neural network (NN) procedure.

8 . The apparatus of claim 1 , wherein the at least one processor is further configured to:

transmit, for the network entity, an indication of a filter capability associated with the at least one filter of the wireless device, wherein the indication of clutter information comprising assistance data associated with the at least one filter of the wireless device is based on the transmitted indication of the filter capability associated with the at least one filter of the wireless device.

9 . The apparatus of claim 8 , wherein the indication of the filter capability includes at least one type of the at least one filter, or wherein the at least one filter is at least one moving target indicator (MTI) filter and the indication of the filter capability includes at least one type of the at least one MTI filter.

10 . The apparatus of claim 1 , wherein the at least one processor is further configured to:

receive, from the network entity, an indication of at least one pulse repetition frequency (PRF) for the one or more signals, wherein, to configure the at least one filter in the set of filters at the wireless device based on the clutter information from the at least one sensing node or the at least one sensor, the at least one processor is configured to:

configure the at least one filter in the set of filters at the wireless device further based on the received indication of the at least one PRF for the one or more signals.

11 . The apparatus of claim 10 , wherein the at least one PRF for the one or more signals is greater than a maximum frequency of a power spectral density (PSD) of clutter associated with the clutter information, or wherein the at least one PRF for the one or more signals is greater than a maximum Doppler frequency associated with a use case of the RF sensing measurement for the at least one filter.

12 . The apparatus of claim 10 , wherein the at least one PRF comprises a plurality of PRFs, and wherein each PRF of the plurality of PRFs is staggered.

13 . The apparatus of claim 12 , wherein each PRF of the plurality of PRFs is associated with a corresponding reference signal (RS) resource set in a set of RS resource sets, and wherein each RS resource set in the set of RS resources sets is associated with a different periodicity.

14 . The apparatus of claim 12 , wherein each PRF of the plurality of PRFs is associated with a corresponding aperiodic sensing reference signal (RS) in a set of aperiodic sensing RSs and a corresponding periodic sensing RS in a set of periodic sensing RSs.

15 . The apparatus of claim 12 , further comprising at least one of an antenna or a transceiver coupled to the at least one processor, wherein, to receive the indication of the clutter information, the at least one processor is configured to:

receive the indication of the clutter information via at least one of the antenna or the transceiver, wherein each PRF of the plurality of PRFs is associated with a corresponding first aperiodic sensing reference signal (RS) in a set of first aperiodic sensing RSs and a corresponding second aperiodic sensing RS in a set of second aperiodic sensing RSs.

16 . An apparatus for wireless communication at a network entity, comprising:

memory; and

at least one processor coupled to the memory and, based at least in part on information stored in the memory, the at least one processor is configured to:

obtain clutter information from at least one sensing node or at least one sensor, wherein the clutter information is associated with one or more stationary or slow-moving reflections of one or more signals with respect to the at least one sensing node or the at least one sensor;

transmit, for a wireless device, an indication of the obtained clutter information from the at least one sensing node or the at least one sensor, wherein the indication of the clutter information comprises assistance data associated with at least one filter of the wireless device; and

receive, from the wireless device, an indication of a radio frequency (RF) sensing measurement for the at least one filter of the wireless device based on the transmitted indication of the obtained clutter information.

17 . The apparatus of claim 16 , wherein the clutter information includes at least one of:

a power spectral density (PSD) of clutter associated with the clutter information;

a classification of the clutter associated with the clutter information;

a time stamp of the at least one sensing node or the at least one sensor; or

a location of the at least one sensing node or the at least one sensor.

18 . The apparatus of claim 16 , wherein the at least one filter comprises one or more of:

at least one moving target indicator (MTI) filter;

at least one radio frequency (RF) filter; or

at least one baseband filter, wherein the network entity comprises a server or a sensing server, wherein the wireless device comprises a network node, a user equipment (UE), or a base station, and wherein, to transmit the indication of the obtained clutter information, the at least one processor is configured to:

periodically transmit the indication of the obtained clutter information comprising the assistance data associated with the at least one filter of the wireless device.

19 . The apparatus of claim 16 , wherein the at least one processor is further configured to:

receive, from the wireless device, a request for the clutter information, wherein, to transmit the indication of the obtained clutter information, the at least one processor is configured to:

transmit the indication of the obtained clutter information based on the received request.

20 . The apparatus of claim 16 , wherein the indication of the RF sensing measurement for the at least one filter includes at least one of:

moving target indicator (MTI) filter information of the at least one filter;

an MTI type of the at least one filter; or

a frequency response of the at least one filter, wherein the RF sensing measurement for the at least one filter is associated with at least one of:

a Kalman filter;

a machine learning (ML) procedure; or

a neural network (NN) procedure.

21 . The apparatus of claim 16 , wherein the at least one processor is further configured to:

receive, from the wireless device, an indication of a filter capability associated with the at least one filter of the wireless device, wherein the indication of the filter capability includes at least one type of the at least one filter, or wherein the at least one filter is at least one moving target indicator (MTI) filter and the indication of the filter capability includes at least one type of the at least one MTI filter.

22 . The apparatus of claim 16 , wherein the at least one processor is further configured to:

schedule at least one pulse repetition frequency (PRF) for the one or more signals; and

transmit an indication of the at least one PRF for the one or more signals.

23 . The apparatus of claim 22 , further comprising at least one of an antenna or a transceiver coupled to the at least one processor, wherein to transmit the indication of the clutter information, the at least one processor is configured to:

transmit the indication of the clutter information via at least one of the antenna or the transceiver, wherein the at least one PRF for the one or more signals is greater than a maximum frequency of a power spectral density (PSD) of clutter associated with the clutter information, or wherein the at least one PRF for the one or more signals is greater than a maximum Doppler frequency associated with a use case of the RF sensing measurement for the at least one filter.

24 . The apparatus of claim 22 , wherein the at least one PRF comprises a plurality of PRFs, and wherein each PRF of the plurality of PRFs is staggered.

25 . The apparatus of claim 24 , wherein each PRF of the plurality of PRFs is associated with a corresponding reference signal (RS) resource set in a set of RS resource sets, and wherein each RS resource set in the set of RS resources sets is associated with a different periodicity;

wherein each PRF of the plurality of PRFs is associated with a corresponding aperiodic sensing RS in a set of aperiodic sensing RSs and a corresponding periodic sensing RS in a set of periodic sensing RSs; or

wherein each PRF of the plurality of PRFs is associated with a corresponding first aperiodic sensing RS in a set of first aperiodic sensing RSs and a corresponding second aperiodic sensing RS in a set of second aperiodic sensing RSs.

26 . A method of wireless communication at a wireless device, comprising:

receiving, from a network entity, an indication of clutter information from at least one sensing node or at least one sensor, wherein the clutter information is associated with one or more stationary or slow-moving reflections of one or more signals with respect to the at least one sensing node or the at least one sensor;

configuring at least one filter in a set of filters at the wireless device based on the received clutter information from the at least one sensing node or the at least one sensor, wherein the indication of the clutter information comprises assistance data associated with the at least one filter of the wireless device;

performing a radio frequency (RF) sensing measurement for the configured at least one filter of the wireless device; and

transmitting, for the network entity, an indication of the RF sensing measurement for the configured at least one filter of the wireless device.

27 . A method of wireless communication at a network entity, comprising:

obtaining clutter information from at least one sensing node or at least one sensor, wherein the clutter information is associated with one or more stationary or slow-moving reflections of one or more signals with respect to the at least one sensing node or the at least one sensor;

transmitting, for a wireless device, an indication of the obtained clutter information from the at least one sensing node or the at least one sensor, wherein the indication of the clutter information comprises assistance data associated with at least one filter of the wireless device; and

receiving, from the wireless device, an indication of a radio frequency (RF) sensing measurement for the at least one filter of the wireless device based on the transmitted indication of the obtained clutter information.