WO2021253307A1

WO2021253307A1 - Downlink control information indication for passive sensing

Info

Publication number: WO2021253307A1
Application number: PCT/CN2020/096716
Authority: WO
Inventors: Qiaoyu Li; Yu Zhang; Hao Xu; Min Huang; Jing Dai; Chao Wei
Original assignee: Qualcomm Incorporated
Priority date: 2020-06-18
Filing date: 2020-06-18
Publication date: 2021-12-23

Abstract

Various aspects of the present disclosure generally relate to wireless communication. In some aspects, a receiver may receive, from a transmitter, downlink control information (DCI) indicating passive sensing configuration information, wherein the passive sensing configuration information indicates one or more reference signals transmitted by the transmitter that are configured to be used for passive sensing. The receiver may monitor the one or more reference signals transmitted by the transmitter to sense one or more objects in an environment surrounding the receiver based at least in part on the passive sensing configuration information indicated in the DCI. Numerous other aspects are provided.

Description

DOWNLINK CONTROL INFORMATION INDICATION FOR PASSIVE SENSING

FIELD OF THE DISCLOSURE

Aspects of the present disclosure generally relate to wireless communication and to techniques and apparatuses associated with a downlink control information (DCI) indication for passive sensing.

BACKGROUND

Wireless communication systems are widely deployed to provide various telecommunication services such as telephony, video, data, messaging, and broadcasts. Typical wireless communication systems may employ multiple-access technologies capable of supporting communication with multiple users by sharing available system resources (e.g., bandwidth, transmit power, and/or the like) . Examples of such multiple-access technologies include code division multiple access (CDMA) systems, time division multiple access (TDMA) systems, frequency-division multiple access (FDMA) systems, orthogonal frequency-division multiple access (OFDMA) systems, single-carrier frequency-division multiple access (SC-FDMA) systems, time division synchronous code division multiple access (TD-SCDMA) systems, and Long Term Evolution (LTE) . LTE/LTE-Advanced is a set of enhancements to the Universal Mobile Telecommunications System (UMTS) mobile standard promulgated by the Third Generation Partnership Project (3GPP) .

A wireless network may include a number of base stations (BSs) that can support communication for a number of user equipment (UEs) . A user equipment (UE) may communicate with a base station (BS) via the downlink and uplink. The downlink (or forward link) refers to the communication link from the BS to the UE, and the uplink (or reverse link) refers to the communication link from the UE to the BS. As will be described in more detail herein, a BS may be referred to as a Node B, a gNB, an access point (AP) , a radio head, a transmit receive point (TRP) , a New Radio (NR) BS, a 5G Node B, and/or the like.

The above multiple access technologies have been adopted in various telecommunication standards to provide a common protocol that enables different user equipment to communicate on a municipal, national, regional, and even global level. New Radio (NR) , which may also be referred to as 5G, is a set of enhancements to the LTE mobile standard promulgated by the Third Generation Partnership Project (3GPP) . NR is designed to better support mobile broadband Internet access by improving spectral efficiency, lowering costs, improving services, making use of new spectrum, and better integrating with other open standards using orthogonal frequency division multiplexing (OFDM) with a cyclic prefix (CP) (CP-OFDM) on the downlink (DL) , using CP-OFDM and/or SC-FDM (e.g., also known as discrete Fourier transform spread OFDM (DFT-s-OFDM) ) on the uplink (UL) , as well as supporting beamforming, multiple-input multiple-output (MIMO) antenna technology, and carrier aggregation. As the demand for mobile broadband access continues to increase, further improvements in LTE, NR, and other radio access technologies remain useful.

SUMMARY

In some aspects, a method of wireless communication, performed by a receiver, may include: receiving, from a transmitter, downlink control information (DCI) indicating passive sensing configuration information, wherein the passive sensing configuration information indicates one or more reference signals transmitted by the transmitter that are configured to be used for passive sensing; and monitoring the one or more reference signals transmitted by the transmitter to sense one or more objects in an environment surrounding the receiver based at least in part on the passive sensing configuration information indicated in the DCI.

In some aspects, a method of wireless communication, performed by a transmitter, may include: transmitting, to a receiver, DCI indicating passive sensing configuration information, wherein the passive sensing configuration information indicates one or more reference signals transmitted by the transmitter that are configured to be used for passive sensing; and transmitting the one or more reference signals to enable the receiver to sense one or more objects in an environment surrounding the receiver based at least in part on the passive sensing configuration information indicated in the DCI.

In some aspects, a receiver for wireless communication may include a memory and one or more processors operatively coupled to the memory. The memory and the one or more processors may be configured to: receive, from a transmitter, DCI indicating passive sensing configuration information, wherein the passive sensing configuration information indicates one or more reference signals transmitted by the transmitter that are configured to be used for passive sensing; and monitor the one or more reference signals transmitted by the transmitter to sense one or more objects in an environment surrounding the receiver based at least in part on the passive sensing configuration information indicated in the DCI.

In some aspects, a transmitter for wireless communication may include a memory and one or more processors operatively coupled to the memory. The memory and the one or more processors may be configured to: transmit, to a receiver, DCI indicating passive sensing configuration information, wherein the passive sensing configuration information indicates one or more reference signals transmitted by the transmitter that are configured to be used for passive sensing; and transmit the one or more reference signals to enable the receiver to sense one or more objects in an environment surrounding the receiver based at least in part on the passive sensing configuration information indicated in the DCI.

In some aspects, a non-transitory computer-readable medium may store one or more instructions for wireless communication. The one or more instructions, when executed by one or more processors of a receiver, may cause the one or more processors to: receive, from a transmitter, DCI indicating passive sensing configuration information, wherein the passive sensing configuration information indicates one or more reference signals transmitted by the transmitter that are configured to be used for passive sensing; and monitor the one or more reference signals transmitted by the transmitter to sense one or more objects in an environment surrounding the receiver based at least in part on the passive sensing configuration information indicated in the DCI.

In some aspects, a non-transitory computer-readable medium may store one or more instructions for wireless communication. The one or more instructions, when executed by one or more processors of a transmitter, may cause the one or more processors to: transmit, to a receiver, DCI indicating passive sensing configuration information, wherein the passive sensing configuration information indicates one or more reference signals transmitted by the transmitter that are configured to be used for passive sensing; and transmit the one or more reference signals to enable the receiver to sense one or more objects in an environment surrounding the receiver based at least in part on the passive sensing configuration information indicated in the DCI.

In some aspects, an apparatus for wireless communication may include: means for receiving, from a transmitter, DCI indicating passive sensing configuration information, wherein the passive sensing configuration information indicates one or more reference signals transmitted by the transmitter that are configured to be used for passive sensing; and means for monitoring the one or more reference signals transmitted by the transmitter to sense one or more objects in an environment surrounding the apparatus based at least in part on the passive sensing configuration information indicated in the DCI.

In some aspects, an apparatus for wireless communication may include: means for transmitting, to a receiver, DCI indicating passive sensing configuration information, wherein the passive sensing configuration information indicates one or more reference signals transmitted by the apparatus that are configured to be used for passive sensing; and means for transmitting the one or more reference signals to enable the receiver to sense one or more objects in an environment surrounding the receiver based at least in part on the passive sensing configuration information indicated in the DCI.

Aspects generally include a method, apparatus, system, computer program product, non-transitory computer-readable medium, user equipment, base station, transmitter, receiver, wireless communication device, and/or processing system as substantially described herein with reference to and as illustrated by the drawings and specification.

The foregoing has outlined rather broadly the features and technical advantages of examples according to the disclosure in order that the detailed description that follows may be better understood. Additional features and advantages will be described hereinafter. The conception and specific examples disclosed may be readily utilized as a basis for modifying or designing other structures for carrying out the same purposes of the present disclosure. Such equivalent constructions do not depart from the scope of the appended claims. Characteristics of the concepts disclosed herein, both their organization and method of operation, together with associated advantages will be better understood from the following description when considered in connection with the accompanying figures. Each of the figures is provided for the purposes of illustration and description, and not as a definition of the limits of the claims.

BRIEF DESCRIPTION OF THE DRAWINGS

So that the above-recited features of the present disclosure can be understood in detail, a more particular description, briefly summarized above, may be had by reference to aspects, some of which are illustrated in the appended drawings. It is to be noted, however, that the appended drawings illustrate only certain typical aspects of this disclosure and are therefore not to be considered limiting of its scope, for the description may admit to other equally effective aspects. The same reference numbers in different drawings may identify the same or similar elements.

Fig. 1 is a diagram illustrating an example of a wireless network, in accordance with various aspects of the present disclosure.

Fig. 2 is a diagram illustrating an example of a base station in communication with a UE in a wireless network, in accordance with various aspects of the present disclosure.

Fig. 3 is a diagram illustrating an example of physical channels and reference signals in a wireless network, in accordance with various aspects of the present disclosure.

Figs. 4A-4C are diagrams illustrating examples of passive sensing, in accordance with various aspects of the present disclosure.

Fig. 5 is a diagram illustrating an example associated with a downlink control information (DCI) indication for passive sensing, in accordance with various aspects of the present disclosure.

Figs. 6-7 are diagrams illustrating example processes associated with a DCI indication for passive sensing, in accordance with various aspects of the present disclosure.

DETAILED DESCRIPTION

Various aspects of the disclosure are described more fully hereinafter with reference to the accompanying drawings. This disclosure may, however, be embodied in many different forms and should not be construed as limited to any specific structure or function presented throughout this disclosure. Rather, these aspects are provided so that this disclosure will be thorough and complete, and will fully convey the scope of the disclosure to those skilled in the art. Based on the teachings herein, one skilled in the art should appreciate that the scope of the disclosure is intended to cover any aspect of the disclosure disclosed herein, whether implemented independently of or combined with any other aspect of the disclosure. For example, an apparatus may be implemented or a method may be practiced using any number of the aspects set forth herein. In addition, the scope of the disclosure is intended to cover such an apparatus or method which is practiced using other structure, functionality, or structure and functionality in addition to or other than the various aspects of the disclosure set forth herein. It should be understood that any aspect of the disclosure disclosed herein may be embodied by one or more elements of a claim.

Several aspects of telecommunication systems will now be presented with reference to various apparatuses and techniques. These apparatuses and techniques will be described in the following detailed description and illustrated in the accompanying drawings by various blocks, modules, components, circuits, steps, processes, algorithms, and/or the like (collectively referred to as “elements” ) . These elements may be implemented using hardware, software, or combinations thereof. Whether such elements are implemented as hardware or software depends upon the particular application and design constraints imposed on the overall system.

It should be noted that while aspects may be described herein using terminology commonly associated with a 5G or NR radio access technologies (RAT) , aspects of the present disclosure can be applied to other RATs, such as a 3G RAT, a 4G RAT, and/or a RAT subsequent to 5G (e.g., 6G) .

Fig. 1 is a diagram illustrating an example of a wireless network 100, in accordance with various aspects of the present disclosure. The wireless network 100 may be or may include elements of a 5G (NR) network, an LTE network, and/or the like. The wireless network 100 may include a number of base stations 110 (shown as BS 110a, BS 110b, BS 110c, and BS 110d) and other network entities. A base station (BS) is an entity that communicates with user equipment (UEs) and may also be referred to as an NR BS, a Node B, a gNB, a 5G node B (NB) , an access point, a transmit receive point (TRP) , and/or the like. Each BS may provide communication coverage for a particular geographic area. In 3GPP, the term “cell” can refer to a coverage area of a BS and/or a BS subsystem serving this coverage area, depending on the context in which the term is used.

A BS may provide communication coverage for a macro cell, a pico cell, a femto cell, and/or another type of cell. A macro cell may cover a relatively large geographic area (e.g., several kilometers in radius) and may allow unrestricted access by UEs with service subscription. A pico cell may cover a relatively small geographic area and may allow unrestricted access by UEs with service subscription. A femto cell may cover a relatively small geographic area (e.g., a home) and may allow restricted access by UEs having association with the femto cell (e.g., UEs in a closed subscriber group (CSG) ) . A BS for a macro cell may be referred to as a macro BS. A BS for a pico cell may be referred to as a pico BS. A BS for a femto cell may be referred to as a femto BS or a home BS. In the example shown in Fig. 1, a BS 110a may be a macro BS for a macro cell 102a, a BS 110b may be a pico BS for a pico cell 102b, and a BS 110c may be a femto BS for a femto cell 102c. A BS may support one or multiple (e.g., three) cells. The terms “eNB” , “base station” , “NR BS” , “gNB” , “TRP” , “AP” , “node B” , “5G NB” , and “cell” may be used interchangeably herein.

In some aspects, a cell may not necessarily be stationary, and the geographic area of the cell may move according to the location of a mobile BS. In some aspects, the BSs may be interconnected to one another and/or to one or more other BSs or network nodes (not shown) in the wireless network 100 through various types of backhaul interfaces such as a direct physical connection, a virtual network, and/or the like using any suitable transport network.

Wireless network 100 may also include relay stations. A relay station is an entity that can receive a transmission of data from an upstream station (e.g., a BS or a UE) and send a transmission of the data to a downstream station (e.g., a UE or a BS) . A relay station may also be a UE that can relay transmissions for other UEs. In the example shown in Fig. 1, a relay station 110d may communicate with macro BS 110a and a UE 120d in order to facilitate communication between BS 110a and UE 120d. A relay station may also be referred to as a relay BS, a relay base station, a relay, and/or the like.

Wireless network 100 may be a heterogeneous network that includes BSs of different types, e.g., macro BSs, pico BSs, femto BSs, relay BSs, and/or the like. These different types of BSs may have different transmit power levels, different coverage areas, and different impacts on interference in wireless network 100. For example, macro BSs may have a high transmit power level (e.g., 5 to 40 watts) whereas pico BSs, femto BSs, and relay BSs may have lower transmit power levels (e.g., 0.1 to 2 watts) .

A network controller 130 may couple to a set of BSs and may provide coordination and control for these BSs. Network controller 130 may communicate with the BSs via a backhaul. The BSs may also communicate with one another, e.g., directly or indirectly via a wireless or wireline backhaul.

UEs 120 (e.g., 120a, 120b, 120c) may be dispersed throughout wireless network 100, and each UE may be stationary or mobile. A UE may also be referred to as an access terminal, a terminal, a mobile station, a subscriber unit, a station, and/or the like. A UE may be a cellular phone (e.g., a smart phone) , a personal digital assistant (PDA) , a wireless modem, a wireless communication device, a handheld device, a laptop computer, a cordless phone, a wireless local loop (WLL) station, a tablet, a camera, a gaming device, a netbook, a smartbook, an ultrabook, a medical device or equipment, biometric sensors/devices, wearable devices (smart watches, smart clothing, smart glasses, smart wrist bands, smart jewelry (e.g., smart ring, smart bracelet) ) , an entertainment device (e.g., a music or video device, or a satellite radio) , a vehicular component or sensor, smart meters/sensors, industrial manufacturing equipment, a global positioning system device, or any other suitable device that is configured to communicate via a wireless or wired medium.

Some UEs may be considered machine-type communication (MTC) or evolved or enhanced machine-type communication (eMTC) UEs. MTC and eMTC UEs include, for example, robots, drones, remote devices, sensors, meters, monitors, location tags, and/or the like, that may communicate with a base station, another device (e.g., remote device) , or some other entity. A wireless node may provide, for example, connectivity for or to a network (e.g., a wide area network such as Internet or a cellular network) via a wired or wireless communication link. Some UEs may be considered Internet-of-Things (IoT) devices, and/or may be implemented as NB-IoT (narrowband internet of things) devices. Some UEs may be considered a Customer Premises Equipment (CPE) . UE 120 may be included inside a housing that houses components of UE 120, such as processor components, memory components, and/or the like. In some aspects, the processor components and the memory components may be coupled together. For example, the processor components (e.g., one or more processors) and the memory components (e.g., a memory) may be operatively coupled, communicatively coupled, electronically coupled, electrically coupled, and/or the like.

In general, any number of wireless networks may be deployed in a given geographic area. Each wireless network may support a particular RAT and may operate on one or more frequencies. A RAT may also be referred to as a radio technology, an air interface, and/or the like. A frequency may also be referred to as a carrier, a frequency channel, and/or the like. Each frequency may support a single RAT in a given geographic area in order to avoid interference between wireless networks of different RATs. In some cases, NR or 5G RAT networks may be deployed.

In some aspects, two or more UEs 120 (e.g., shown as UE 120a and UE 120e) may communicate directly using one or more sidelink channels (e.g., without using a base station 110 as an intermediary to communicate with one another) . For example, the UEs 120 may communicate using peer-to-peer (P2P) communications, device-to-device (D2D) communications, a vehicle-to-everything (V2X) protocol (e.g., which may include a vehicle-to-vehicle (V2V) protocol, a vehicle-to-infrastructure (V2I) protocol, and/or the like) , a mesh network, and/or the like. In this case, the UE 120 may perform scheduling operations, resource selection operations, and/or other operations described elsewhere herein as being performed by the base station 110.

Devices of wireless network 100 may communicate using the electromagnetic spectrum, which may be subdivided based on frequency or wavelength into various classes, bands, channels, and/or the like. For example, devices of wireless network 100 may communicate using an operating band having a first frequency range (FR1) , which may span from 410 MHz to 7.125 GHz, and/or may communicate using an operating band having a second frequency range (FR2) , which may span from 24.25 GHz to 52.6 GHz. The frequencies between FR1 and FR2 are sometimes referred to as mid-band frequencies. Although a portion of FR1 is greater than 6 GHz, FR1 is often referred to as a “sub-6 GHz” band. Similarly, FR2 is often referred to as a “millimeter wave” band despite being different from the extremely high frequency (EHF) band (30 GHz –300 GHz) which is identified by the International Telecommunications Union (ITU) as a “millimeter wave” band. Thus, unless specifically stated otherwise, it should be understood that the term “sub-6 GHz” or the like, if used herein, may broadly represent frequencies less than 6 GHz, frequencies within FR1, and/or mid-band frequencies (e.g., greater than 7.125 GHz) . Similarly, unless specifically stated otherwise, it should be understood that the term “millimeter wave” or the like, if used herein, may broadly represent frequencies within the EHF band, frequencies within FR2, and/or mid-band frequencies (e.g., less than 24.25 GHz) . It is contemplated that the frequencies included in FR1 and FR2 may be modified, and techniques described herein are applicable to those modified frequency ranges.

As indicated above, Fig. 1 is provided as an example. Other examples may differ from what is described with regard to Fig. 1.

Fig. 2 is a diagram illustrating an example 200 of a base station 110 in communication with a UE 120 in a wireless network 100, in accordance with various aspects of the present disclosure. Base station 110 may be equipped with T antennas 234a through 234t, and UE 120 may be equipped with R antennas 252a through 252r, where in general T ≥ 1 and R ≥ 1.

At base station 110, a transmit processor 220 may receive data from a data source 212 for one or more UEs, select one or more modulation and coding schemes (MCS) for each UE based at least in part on channel quality indicators (CQIs) received from the UE, process (e.g., encode and modulate) the data for each UE based at least in part on the MCS (s) selected for the UE, and provide data symbols for all UEs. Transmit processor 220 may also process system information (e.g., for semi-static resource partitioning information (SRPI) and/or the like) and control information (e.g., CQI requests, grants, upper layer signaling, and/or the like) and provide overhead symbols and control symbols. Transmit processor 220 may also generate reference symbols for reference signals (e.g., a cell-specific reference signal (CRS) , a demodulation reference signal (DMRS) , and/or the like) and synchronization signals (e.g., the primary synchronization signal (PSS) and secondary synchronization signal (SSS) ) . A transmit (TX) multiple-input multiple-output (MIMO) processor 230 may perform spatial processing (e.g., precoding) on the data symbols, the control symbols, the overhead symbols, and/or the reference symbols, if applicable, and may provide T output symbol streams to T modulators (MODs) 232a through 232t. Each modulator 232 may process a respective output symbol stream (e.g., for OFDM and/or the like) to obtain an output sample stream. Each modulator 232 may further process (e.g., convert to analog, amplify, filter, and upconvert) the output sample stream to obtain a downlink signal. T downlink signals from modulators 232a through 232t may be transmitted via T antennas 234a through 234t, respectively.

At UE 120, antennas 252a through 252r may receive the downlink signals from base station 110 and/or other base stations and may provide received signals to demodulators (DEMODs) 254a through 254r, respectively. Each demodulator 254 may condition (e.g., filter, amplify, downconvert, and digitize) a received signal to obtain input samples. Each demodulator 254 may further process the input samples (e.g., for OFDM and/or the like) to obtain received symbols. A MIMO detector 256 may obtain received symbols from all R demodulators 254a through 254r, perform MIMO detection on the received symbols if applicable, and provide detected symbols. A receive processor 258 may process (e.g., demodulate and decode) the detected symbols, provide decoded data for UE 120 to a data sink 260, and provide decoded control information and system information to a controller/processor 280. A channel processor may determine reference signal received power (RSRP) , received signal strength indicator (RSSI) , reference signal received quality (RSRQ) , channel quality indicator (CQI) , and/or the like. In some aspects, one or more components of UE 120 may be included in a housing 284.

Network controller 130 may include communication unit 294, controller/processor 290, and memory 292. Network controller 130 may include, for example, one or more devices in a core network. Network controller 130 may communicate with base station 110 via communication unit 294.

On the uplink, at UE 120, a transmit processor 264 may receive and process data from a data source 262 and control information (e.g., for reports that include RSRP, RSSI, RSRQ, CQI, and/or the like) from controller/processor 280. Transmit processor 264 may also generate reference symbols for one or more reference signals. The symbols from transmit processor 264 may be precoded by a TX MIMO processor 266 if applicable, further processed by modulators 254a through 254r (e.g., for DFT-s-OFDM, CP-OFDM, and/or the like) , and transmitted to base station 110. In some aspects, the UE 120 includes a transceiver. The transceiver may include any combination of antenna (s) 252, modulators and/or demodulators 254, MIMO detector 256, receive processor 258, transmit processor 264, and/or TX MIMO processor 266. The transceiver may be used by a processor (e.g., controller/processor 280) and memory 282 to perform aspects of any of the methods described herein, for example, as described with reference to Figs. 4A-4C, Fig. 5, and/or Figs. 6-7.

At base station 110, the uplink signals from UE 120 and other UEs may be received by antennas 234, processed by demodulators 232, detected by a MIMO detector 236 if applicable, and further processed by a receive processor 238 to obtain decoded data and control information sent by UE 120. Receive processor 238 may provide the decoded data to a data sink 239 and the decoded control information to controller/processor 240. Base station 110 may include communication unit 244 and communicate to network controller 130 via communication unit 244. Base station 110 may include a scheduler 246 to schedule UEs 120 for downlink and/or uplink communications. In some aspects, the base station 110 includes a transceiver. The transceiver may include any combination of antenna (s) 234, modulators and/or demodulators 232, MIMO detector 236, receive processor 238, transmit processor 220, and/or TX MIMO processor 230. The transceiver may be used by a processor (e.g., controller/processor 240) and memory 242 to perform aspects of any of the methods described herein, for example, as described with reference to Figs. 4A-4C, Fig. 5, and/or Figs. 6-7.

Controller/processor 240 of base station 110, controller/processor 280 of UE 120, and/or any other component (s) of Fig. 2 may perform one or more techniques associated with a downlink control information (DCI) indication for passive sensing, as described in more detail elsewhere herein. For example, controller/processor 240 of base station 110, controller/processor 280 of UE 120, and/or any other component (s) of Fig. 2 may perform or direct operations of, for example, process 600 of Fig. 6, process 700 of Fig. 7, and/or other processes as described herein.

Memories

242 and 282 may store data and program codes for base station 110 and UE 120, respectively. In some aspects, memory 242 and/or memory 282 may include a non-transitory computer-readable medium storing one or more instructions (e.g., code, program code, and/or the like) for wireless communication. For example, the one or more instructions, when executed (e.g., directly, or after compiling, converting, interpreting, and/or the like) by one or more processors of the base station 110 and/or the UE 120, may cause the one or more processors, the UE 120, and/or the base station 110 to perform or direct operations of, for example, process 600 of Fig. 6, process 700 of Fig. 7, and/or other processes as described herein. In some aspects, executing instructions may include running the instructions, converting the instructions, compiling the instructions, interpreting the instructions, and/or the like.

In some aspects, UE 120 may include means for receiving, from a transmitter (e.g., base station 110, another UE 120, and/or the like) , DCI indicating passive sensing configuration information, wherein the passive sensing configuration information indicates one or more reference signals transmitted by the transmitter that are configured to be used for passive sensing, means for monitoring the one or more reference signals transmitted by the transmitter to sense one or more objects in an environment surrounding UE 120 based at least in part on the passive sensing configuration information indicated in the DCI, and/or the like. Additionally, or alternatively, UE 120 may include means for transmitting, to a receiver (e.g., base station 110, another UE 120, and/or the like) , DCI indicating passive sensing configuration information, wherein the passive sensing configuration information indicates one or more reference signals transmitted by UE 120 that are configured to be used for passive sensing, means for transmitting the one or more reference signals to enable the receiver to sense one or more objects in an environment surrounding the receiver based at least in part on the passive sensing configuration information indicated in the DCI, and/or the like. In some aspects, such means may include one or more components of UE 120 described in connection with Fig. 2, such as controller/processor 280, transmit processor 264, TX MIMO processor 266, MOD 254, antenna 252, DEMOD 254, MIMO detector 256, receive processor 258, and/or the like.

In some aspects, base station 110 may include means for receiving, from a transmitter (e.g., UE 120, another base station 110, and/or the like) , DCI indicating passive sensing configuration information, wherein the passive sensing configuration information indicates one or more reference signals transmitted by the transmitter that are configured to be used for passive sensing, means for monitoring the one or more reference signals transmitted by the transmitter to sense one or more objects in an environment surrounding base station 110 based at least in part on the passive sensing configuration information indicated in the DCI, and/or the like. Additionally, or alternatively, base station 110 may include means for transmitting, to a receiver (e.g., UE 120, another base station 110, and/or the like) , DCI indicating passive sensing configuration information, wherein the passive sensing configuration information indicates one or more reference signals transmitted by base station 110 that are configured to be used for passive sensing, means for transmitting the one or more reference signals to enable the receiver to sense one or more objects in an environment surrounding the receiver based at least in part on the passive sensing configuration information indicated in the DCI, and/or the like. In some aspects, such means may include one or more components of base station 110 described in connection with Fig. 2, such as antenna 234, DEMOD 232, MIMO detector 236, receive processor 238, controller/processor 240, transmit processor 220, TX MIMO processor 230, MOD 232, antenna 234, and/or the like.

While blocks in Fig. 2 are illustrated as distinct components, the functions described above with respect to the blocks may be implemented in a single hardware, software, or combination component or in various combinations of components. For example, the functions described with respect to the transmit processor 264, the receive processor 258, and/or the TX MIMO processor 266 may be performed by or under the control of processor 280.

As indicated above, Fig. 2 is provided as an example. Other examples may differ from what is described with regard to Fig. 2.

Fig. 3 is a diagram illustrating an example 300 of physical channels and reference signals in a wireless network, in accordance with various aspects of the present disclosure. As shown in Fig. 3, downlink channels and downlink reference signals may carry information from a base station 110 to a UE 120, and uplink channels and uplink reference signals may carry information from a UE 120 to a base station 110.

As shown, a downlink channel may include a physical downlink control channel (PDCCH) that carries downlink control information (DCI) , a physical downlink shared channel (PDSCH) that carries downlink data, a physical broadcast channel (PBCH) that carries system information, and/or the like. In some aspects, PDSCH communications may be scheduled by PDCCH communications. As further shown, an uplink channel may include a physical uplink control channel (PUCCH) that carries uplink control information (UCI) , a physical uplink shared channel (PUSCH) that carries uplink data, a physical random access channel (PRACH) used for initial network access, and/or the like. In some aspects, the UE 120 may transmit acknowledgement (ACK) or negative acknowledgement (NACK) feedback (e.g., ACK/NACK feedback or ACK/NACK information) in UCI on the PUCCH and/or the PUSCH.

As further shown, a downlink reference signal may include a synchronization signal block (SSB) , a channel state information (CSI) reference signal (CSI-RS) , a demodulation reference signal (DMRS) , a phase tracking reference signal (PTRS) , a positioning reference signal (PRS) , and/or the like. As also shown, an uplink reference signal may include a sounding reference signal (SRS) , a DMRS, a PTRS, and/or the like.

An SSB may carry information used for initial network acquisition and synchronization, such as a primary synchronization signal (PSS) , a secondary synchronization signal (SSS) , a PBCH, and a PBCH DMRS. An SSB is sometimes referred to as a synchronization signal/PBCH (SS/PBCH) block. In some aspects, the base station 110 may transmit multiple SSBs on multiple corresponding beams, and the SSBs may be used for beam selection.

A CSI-RS may carry information used for downlink channel estimation (e.g., downlink CSI acquisition) , which may be used for scheduling, link adaptation, or beam management, among other examples. The base station 110 may configure a set of CSI-RSs for the UE 120, and the UE 120 may measure the configured set of CSI-RSs. Based at least in part on the measurements, the UE 120 may perform channel estimation and may report channel estimation parameters to the base station 110 (e.g., in a CSI report) , such as a channel quality indicator (CQI) , a precoding matrix indicator (PMI) , a CSI-RS resource indicator (CRI) , a layer indicator (LI) , a rank indicator (RI) , or an RSRP, among other examples. The base station 110 may use the CSI report to select transmission parameters for downlink communications to the UE 120, such as a number of transmission layers (e.g., a rank) , a precoding matrix (e.g., a precoder) , an MCS, or a refined downlink beam (e.g., using a beam refinement procedure or a beam management procedure) , among other examples.

A DMRS may carry information used to estimate a radio channel for demodulation of an associated physical channel (e.g., PDCCH, PDSCH, PBCH, PUCCH, or PUSCH) . The design and mapping of a DMRS may be specific to a physical channel for which the DMRS is used for estimation. DMRSs are UE-specific, can be beamformed, can be confined in a scheduled resource (e.g., rather than transmitted on a wideband) , and can be transmitted only when necessary. As shown, DMRSs are used for both downlink communications and uplink communications.

A PTRS may carry information used to compensate for oscillator phase noise. Typically, the phase noise increases as the oscillator carrier frequency increases. Thus, PTRS can be utilized at high carrier frequencies, such as millimeter wave frequencies, to mitigate phase noise. The PTRS may be used to track the phase of the local oscillator and to enable suppression of phase noise and common phase error (CPE) . As shown, PTRSs are used for both downlink communications (e.g., on the PDSCH) and uplink communications (e.g., on the PUSCH) .

A PRS may carry information used to enable timing or ranging measurements of the UE 120 based on signals transmitted by the base station 110 to improve observed time difference of arrival (OTDOA) positioning performance. For example, a PRS may be a pseudo-random Quadrature Phase Shift Keying (QPSK) sequence mapped in diagonal patterns with shifts in frequency and time to avoid collision with cell-specific reference signals and control channels (e.g., a PDCCH) . In general, a PRS may be designed to improve hearability by the UE 120, which may need to detect downlink signals from multiple neighboring base stations in order to perform OTDOA-based positioning. Accordingly, the UE 120 may receive a PRS from multiple cells (e.g., a reference cell and one or more neighbor cells) , and may report a reference signal time difference (RSTD) based on OTDOA measurements associated with the PRSs received from the multiple cells. In some aspects, the base station 110 may then calculate a position of the UE 120 based on the RSTD measurements reported by the UE 120.

An SRS may carry information used for uplink channel estimation, which may be used for scheduling, link adaptation, precoder selection, or beam management, among other examples. The base station 110 may configure one or more SRS resource sets for the UE 120, and the UE 120 may transmit SRSs on the configured SRS resource sets. An SRS resource set may have a configured usage, such as uplink CSI acquisition, downlink CSI acquisition for reciprocity-based operations, uplink beam management, among other examples. The base station 110 may measure the SRSs, may perform channel estimation based at least in part on the measurements, and may use the SRS measurements to configure communications with the UE 120.

As indicated above, Fig. 3 is provided as an example. Other examples may differ from what is described with regard to Fig. 3.

Figs. 4A-4C are diagrams illustrating examples 400 of passive sensing, in accordance with various aspects of the present disclosure. In some wireless systems (e.g., a 5G or NR wireless system) , object sensing may be performed in order to detect nearby objects. For example, in a vehicle-to-everything (V2X) use case, a vehicle UE or another suitable device may sense one or more objects in a surrounding environment (e.g., a roadway) and take in-time action to avoid traffic accidents and/or the like. Moreover, network infrastructure may be configured to sense a traffic situation based on the presence and/or movements of objects in the surrounding environment and send instructions, warnings, informational messages, and/or other information related to the traffic situation to vehicle UEs, pedestrian UEs, and/or the like.

In some cases, sensing using radio signals may provide effective object sensing, particularly in situations when other sensing techniques become unreliable or otherwise cannot be used. For example, video sensing typically does not perform well in low light, such as at night, in rain, in a tunnel, and/or the like. Moreover, other sensing technologies, such as light detection and ranging (LIDAR) , may be cost prohibitive. Accordingly, radio sensing, which is not sensitive to light levels and is relatively low cost, may provide efficient and effective object sensing. Radio sensing may use the transmission and the reception of radio signals for object sensing. For example, radio sensing may use active sensing techniques, passive sensing techniques, or a combination thereof. In active sensing, sometimes referred to as standard or mono-static sensing, standard or mon-static radar, and/or the like, a sensing signal received at a receiver is also transmitted by the receiver (e.g., the sensing signal is self-transmitted) , or the transmitter and receiver of the sensing signal are co-located. In passive sensing (or passive radar) , sometimes referred to as bi-static or multi-static sensing, a sensing signal received at a receiver is transmitted by the target object or another transmitter (e.g., the sensing signal is not self-transmitted) . In some cases, passive sensing may be used when the receiver is not enabled to transmit sensing signals, or when the receiver is not transmitting sensing signals (e.g., the receiver has muted sensing signal transmission) , for example, to reduce co-channel interference and/or save power.

Accordingly, in an active sensing or active radar system, a sensing device may detect an object in a surrounding environment by transmitting a sensing signal toward a target object, which reflects the sensing signal such that the sensing device may detect a backscattered signal reflected off the target object. In contrast, a passive sensing or passive radar system uses one or more transmitters (e.g., terrestrial broadcast transmitters, cellular communication transmitters, and/or the like) to illuminate one or more target objects, with one or more receivers at different locations to detect the target object (s) based on the sensing signals transmitted by the transmitter (s) . In other words, in a passive sensing system, a transmitter in a first location may transmit a signal in one or more directions (e.g., using different beams) , a target object in a second location may reflect the signal transmitted by the transmitter, and a receiver in a third location may detect the target object based at least in part on the signal that the transmitter transmits in the one or more directions.

For example, Fig. 4A illustrates an example passive sensing topology that includes a sensing signal transmitter 410 (e.g., a base station, a TRP, a roadside unit (RSU) , a UE, and/or the like) configured to transmit one or more sensing signals (e.g., in one or more beam directions) , and a sensing signal receiver 420 (a UE, an RSU, a TRP, a base station, and/or the like) arranged to sense, detect, or otherwise receive the one or more sensing signals. As further shown in Fig. 4A, a sensing signal transmitted by the sensing signal transmitter 410 may reflect off a target object 430. Accordingly, as shown in Fig. 4A, the sensing signal receiver 420 may receive the sensing signal via multiple paths, which may include a line of sight (LoS) path and a backscattered path in which the sensing signal is backscattered from the target object 430. In some aspects, the sensing signal receiver 420 may take the sensing signal received via the LoS path as a reference, and may correlate the sensing signal received via the LoS path with the sensing signal received via the backscattered path. In this way, an excess delay derived from a correlation maximum may define an ellipse 440 (e.g., with the sensing signal transmitter 410 and the sensing signal receiver 420 located at focal points) , and the ellipse 440 may represent possible positions of the target object 430 relative to the sensing signal transmitter 410 and the sensing signal receiver 420.

In some aspects, a resolution of the possible positions of the target object 430 may be improved in a multi-node passive sensing topology. For example, Fig. 4B illustrates an example multiple-input single-output (MISO) passive sensing topology in which multiple sensing signal transmitters 410 transmit respective sensing signals that may reflect off a target object 430. Accordingly, as shown in Fig. 4B, the sensing signal receiver 420 may receive the sensing signals transmitted by the multiple sensing signal transmitters 410 via different LoS paths and different backscattered paths. Additionally, or alternatively, Fig. 4C illustrates an example single-input multiple-output (SIMO) passive sensing topology in which multiple sensing signal receivers 420 obtain respective ellipses 440 to determine the possible positions of a target object 430 based on sensing signals transmitted by a single sensing signal transmitter 410. Accordingly, in some aspects, the ellipses 440 obtained by the multiple sensing signal receivers 420 can be exchanged and/or fused in a node with suitable computational capabilities (e.g., one of the sensing signal receivers 420, the sensing signal transmitter 410, a base station, a dedicated server, and/or the like) . In this way, multiple ellipses 440 that represent the possible positions of the target object 430 relative to the sensing signal transmitter (s) 410 and the sensing signal receiver (s) 420 can be derived, and the multiple ellipses 440 may be fused to improve a passive sensing resolution (e.g., the possible position (s) of the target object 430 may be limited to locations where the multiple ellipses 440 intersect, where distances between the multiple ellipses 440 satisfy a threshold, and/or the like) . Furthermore, in cases where multiple sensing signal transmitters 410 and multiple sensing signal receivers 420 are available, passive sensing may be implemented in a multiple-input multiple-output (MIMO) topology to further improve the sensing resolution relative to standalone MISO or SIMO topologies. Additionally, in some aspects, V2X application-layer protocols can be used to provide a reference position, Doppler information, speed, and/or other information related to the sensing signal receivers 420, which may further improve resolution of the final fusion.

In some aspects, as described above, a sensing signal transmitted by a sensing signal transmitter 410 may be a radio signal, such as a reference signal (e.g., a downlink or uplink reference signal in a 5G/NR system) , a data channel (e.g., a PDSCH) transmitted as a frequency modulated continuous wave signal, and/or the like. In this way, passive sensing may be implemented without requiring any additional spectrum or any additional transmissions (e.g., the passive sensing may be performed based on reference signals and/or data channels that are transmitted by a base station, a TRP, an RSU, a UE, and/or the like without requiring the sensing signal transmitter 410 to transmit specialized sensing signals) . Furthermore, because sensing signal transmitters 410 may transmit broadcast, multicast, unicast, and/or other radio signals over a broad coverage area, implementing passive sensing using radio signals may broaden coverage beyond standard mono-static active sensing use cases, which have limited coverage in terms of ranges and angles and may be subject to interference because different transmitters may transmit radar signals in an uncoordinated manner. Moreover, passive sensing based on radio signals may be used to sense or otherwise detect vehicles, cyclists, pedestrians, and/or other objects that may not be equipped with V2X transceivers or other communication capabilities. Furthermore, radio nodes acting as sensing signal transmitters 410 and sensing signal receivers 420 may be synchronized with one another (at least on a downlink) , and UEs operating as sensing signal receivers 420 (or sensing signal transmitters 410) may be under the control of a base station operating as sensing signal transmitter 410 (or sensing signal receiver 420) , which avoids congestion, interference, collisions, and/or the like, radio resources can be dynamically adjusted according to target location needs, locally estimated parameters can be efficiently exchanged using wireless network services (e.g., V2X or eMBB) , and/or the like. However, in order to perform sensing operations based on radio signals, a receiver may need to know certain information related to the radio signals.

For example, in order to estimate a frequency domain channel response in a passive sensing system, a sensing signal receiver may need to be provided with information related to one or more reference signals that are configured to be used as sensing signals. This is because the sensing signal receiver generally follows legacy OFDM signal processing procedures to estimate frequency domain channel responses based on reference signal transmissions and/or decoded data. Accordingly, a sensing signal receiver may need to be provided with information related to one or more reference signals that are configured to be used as sensing signals, in order to jointly process downlink signals that may be targeted for different UEs and/or to separately process and measure uplink and/or sidelink signals that are transmitted with different multipath propagation characteristics because the uplink and/or sidelink signals are transmitted by different UEs. Furthermore, in some cases, performance of the frequency domain channel response estimation may be improved by providing a sensing signal receiver with information to enable decoding of a data channel (e.g., a PDSCH transmission) . For example, the sensing signal receiver may use cyclic redundancy code (CRC) -corrected decoded data to refine the channel estimation obtained from the reference signal transmissions. However, current wireless network implementations lack support for techniques to provide a sensing signal receiver (e.g., a UE) with information related to reference signals intended for another UE and/or data decoding information for uplink and/or downlink data channels associated with another UE.

Some techniques and apparatuses described herein relate to a downlink control information (DCI) indication that may include passive sensing configuration information. For example, a sensing signal transmitter may transmit, to a sensing signal receiver, DCI that indicates passive sensing configuration information, which may include information related to one or more reference signals transmitted by the sensing signal transmitter that are configured to be used for passive sensing. Accordingly, the sensing signal receiver may monitor the reference signal (s) transmitted by the sensing signal transmitter to sense one or more objects in an environment surrounding the sensing signal receiver. Furthermore, in some aspects, the DCI may include information to enable the sensing signal receiver to decode physical layer information associated with one or more data channels that are configured for a UE (e.g., a device other than the sensing signal receiver) without enabling the sensing signal receiver to obtain upper-layer payloads associated with the intended recipient. In this way, a sensing signal receiver may be configured with DCI that enables the sensing signal receiver to monitor reference signals and data channel transmissions in a radio access network such that the sensing signal receiver can use legacy signal processing procedures to estimate and/or refine a frequency domain channel response in order to reliably sense objects in the surrounding environment.

As indicated above, Figs. 4A-4C are provided as an example. Other examples may differ from what is described with regard to Figs. 4A-4C.

Fig. 5 is a diagram illustrating an example 500 associated with a DCI indication for passive sensing, in accordance with various aspects of the present disclosure. As shown in Fig. 5, example 500 includes a sensing signal transmitter (e.g., sensing signal transmitter 410) , a sensing signal receiver (e.g., sensing signal receiver 420) , and one or more target objects (e.g., target object 430) . In some aspects, at least the sensing signal transmitter and the sensing signal receiver may operate in a wireless network (e.g., wireless network 110) . Furthermore, in some aspects, the one or more target objects may operate in the same wireless network as the sensing signal transmitter and the sensing signal receiver, may operate in a different wireless network from the sensing signal transmitter and the sensing signal receiver, may not be equipped with a transceiver or other communication capabilities, and/or the like. In general, as described herein, the sensing signal transmitter may correspond to a base station, a roadside unit (RSU) , a UE, and/or the like, and the sensing signal receiver may likewise correspond to a base station, an RSU, a UE, and/or the like. The target object (s) may include a vehicle, a pedestrian, or another object in an environment surrounding the sensing signal transmitter and the sensing signal receiver.

As shown in Fig. 5, and by reference number 510, the sensing signal transmitter may transmit, and the sensing signal receiver may receive, DCI that includes passive sensing configuration information. In some aspects, the DCI may indicate one or more reference signals transmitted by the transmitter that are configured to be used for passive sensing. In general, the reference signals configured to be used for passive sensing may include any suitable downlink reference signal or uplink reference signal. For example, downlink reference signals that may be configured for passive sensing may include an SSB, a CSI-RS, a downlink DMRS, a downlink PTRS, a PRS, and/or the like, and uplink reference signals that may be configured for passive sensing may include an SRS, an uplink DMRS, an uplink PTRS, and/or the like. Accordingly, as described herein, the sensing signal transmitter may transmit the DCI to configure the sensing signal receiver with information regarding which reference signal (s) the sensing signal receiver is to consider for passive sensing purposes. Additionally, or alternatively, the passive sensing configuration information may indicate decoding information associated with one or more data channels (e.g., PDSCH and/or PUSCH transmissions) to be transmitted by the sensing signal transmitter. Furthermore, in some aspects, the DCI may be configured, or the passive sensing configuration information may indicate, that the DCI is intended to provide a passive sensing configuration and is not to be used for scheduling PDSCH and/or PUSCH transmissions. In some aspects, the sensing signal receiver may receive the DCI that indicates the passive sensing configuration information in a PDCCH communication, or the DCI may be received in a PDSCH communication scheduled by a PDCCH communication.

As further shown in Fig. 5, and by reference number 520, the sensing signal receiver may decode the DCI to determine the passive sensing configuration information included in the DCI. For example, in some aspects, the sensing signal receiver may receive (e.g., from the sensing signal transmitter, a base station, and/or the like) a radio resource control (RRC) configuration that includes information to enable the sensing signal receiver to decode the passive sensing configuration information indicated in the DCI. For example, in some aspects, the RRC configuration may indicate a frequency domain resource allocation (FDRA) type, a time domain resource allocation (TDRA) type, a code block group (CBG) configuration, bandwidth part information, carrier information, reference signal configurations, and/or the like. In general, the RRC configuration that the sensing signal receiver uses to decode the DCI that indicates the passive sensing configuration information may be different from an RRC configuration that the sensing signal receiver uses to decode a DCI used to schedule reception and/or transmission of a PUSCH, a PDSCH, a physical sidelink shared channel (PSSCH) , and/or the like.

In some aspects, the sensing signal transmitter may scramble the DCI that indicates the passive sensing configuration information using a passive sensing radio network temporary identifier (RNTI) . Accordingly, in order to decode the DCI, the sensing signal receiver may be configured with information related to the passive sensing RNTI to enable the sensing signal receiver to descramble the DCI. For example, in some aspects, the passive sensing RNTI may be explicitly configured by the sensing signal transmitter, or the sensing signal receiver may implicitly derive the passive sensing RNTI based at least in part on one or more parameters configured or otherwise indicated by the sensing signal transmitter. In general, when the DCI used to indicate the passive sensing configuration information is associated with a format otherwise used to schedule PUSCH and/or PDSCH transmissions, the passive sensing RNTI used to scramble the DCI may be assigned to the sensing signal receiver after the sensing signal receiver has completed an RRC connection setup procedure. For example, the sensing signal transmitter may refrain from assigning a cell-specific RNTI or another RNTI that can be obtained prior to completing the RRC connection setup procedure to the sensing signal receiver for DCI monitoring, to prevent the sensing signal receiver from obtaining upper-layer payloads associated with PUSCH transmissions by and/or PDSCH transmissions to another UE (e.g., for privacy and/or security purposes) . Accordingly, the passive sensing RNTI that the sensing signal transmitter uses to scramble the DCI and the sensing signal receiver uses to descramble the DCI may be limited to RNTIs that can be obtained after RRC connection setup, so that the sensing signal receiver can decode only physical layer information and not obtain upper layer keys or other information to decode upper-layer payloads.

In some aspects, the sensing signal receiver may be configured to decode the DCI that indicates the passive sensing configuration information based at least in part on a DCI format associated with the DCI. For example, in some aspects, the DCI may reuse an existing DCI format used for scheduling PUSCH transmissions (e.g., DCI format 0_0 or 0_1) or an existing DCI format used for scheduling PDSCH transmissions (e.g., DCI format 1_0 or 1_1) . In such cases, one or more reserved bits in the existing DCI format may be used to indicate that the DCI is provided to indicate reference signals that are configured to be used for passive sensing and/or data decoding information to be used for passive sensing. Accordingly, the one or more reserved bits may indicate that the DCI does not schedule any PUSCH and/or PDSCH transmissions.

Additionally, or alternatively, in some aspects, the DCI may omit one or more fields associated with the DCI format used to schedule PUSCH or PDSCH transmissions. For example, in cases where the DCI is based on DCI format 0_0 used for PUSCH scheduling, the DCI may omit a new data indicator (NDI) field, a hybrid automatic repeat request (HARQ) process number field, a transmit power control (TPC) for PUSCH field, and/or other fields that relate to PUSCH scheduling. Alternatively, in cases where the DCI is based on DCI format 0_1, which is also used for PUSCH scheduling, the DCI may omit a downlink assignment index (DAI) field, a sounding reference signal (SRS) request field, an SRS resource indicator (SRI) field, a transmit precoder matrix indication (TPMI) field, and a channel state information (CSI) request field in addition to the NDI field, the HARQ process number field, and the TPC for PUSCH field. Alternatively, in cases where the DCI is based on DCI format 1_0 used for PDSCH scheduling, the DCI may omit an NDI field, a HARQ process number field, a DAI field, a TPC for PUCCH field, a PUCCH resource indicator field, a PDSCH-to-HARQ feedback timing indicator field, and/or other fields that relate to PDSCH scheduling. Alternatively, in cases where the DCI is based on DCI format 1_1, which is also used for PDSCH scheduling, the DCI may omit an SRS request field in addition to the NDI field, the HARQ process number field, the DAI field, the TPC for PUCCH field, the PUCCH resource indicator field, and/or the PDSCH-to-HARQ feedback timing indicator field. Alternatively, in some aspects, the DCI may include one or more of the NDI field, the HARQ process identifier field, the DAI field, and/or other fields for PDSCH reception in order to improve channel estimate over multiple transmissions (e.g., based on the NDI field, the HARQ process identifier field, the DAI field, and/or the like indicating information related to PDSCH retransmissions) .

In some aspects, a combination of fields that are included in the DCI to indicate the passive sensing configuration information may be indicated in downlink signaling. For example, the combination of fields may be indicated to the sensing signal receiver in RRC configuration information, or the combination of fields that are included in the DCI may be dynamically indicated and/or updated via a medium access control (MAC) control element, a separate DCI, and/or the like.

Additionally, or alternatively, the sensing signal receiver may determine the combination of fields that are included in the DCI based at least in part on a type of the one or more reference signals that are configured for passive sensing. For example, in cases where only a DMRS is configured to be used for passive sensing, the DCI may omit fields that are unrelated to the DMRS and/or fields that are related to other reference signals. For example, when only a DMRS is configured to be used for passive sensing, a DCI based on DCI format 0_0 may omit a padding bits field, an MCS field, a redundancy version (RV) field, and/or the like, and a DCI based on DCI format 0_1 may omit the MCS field, the RV field, a CBG transmission indicator (CBGTI) field, a PTRS-to-DMRS association field, a beta offsets field, an uplink scheduling indicator field, and/or the like. Alternatively, when only a DMRS is configured to be used for passive sensing, a DCI based on DCI format 1_0 may omit a virtual resource block (VRB) -to-physical resource block (PRB) mapping field, an MCS field, an RV field, and/or the like, and a DCI based on DCI format 1_1 may omit the VRB-to-PRB mapping field, a rate matching indicator field, a zero power (ZP) CSI-RS trigger field, an MCS field, an RV field, a CBGTI field, a CBG flush indicator (CBGFI) field, and/or the like. Accordingly, as described herein, when one or more reference signal types are not included among the one or more reference signals that are configured to be used for passive sensing, or when the passive sensing information indicates that one or more reference signal types are not to be used for passive sensing, the sensing signal receiver may determine that the DCI omits or otherwise excludes one or more fields that relate to scheduling such reference signal types (e.g., the DCI may omit or exclude fields related to SRS requests and/or CSI requests if the passive sensing configuration information indicates that the sensing signal receiver is not to consider SRS or CSI-RS for passive sensing, the DCI may omit or exclude fields related to PTRS-DMRS associations if the passive sensing configuration information indicates that the sensing signal receiver is not to consider PTRS for passive sensing, and/or the like) .

Alternatively, in some aspects, the DCI used to indicate the passive sensing configuration information may be associated with a group common (GC) DCI format, which may reduce CRC overhead especially in cases where the DCI has a small payload size (e.g., when only a DMRS is used for passive sensing) such that CRC overhead would be dominant if separate DCIs were to be used and/or in cases where multiple sensing signal receivers are configured to perform passive sensing (e.g., in a SIMO topology, a MIMO topology, and/or the like) . For example, as shown in Fig. 5, and by reference number 525, the GC-DCI may include multiple segments, each of which includes a payload with passive sensing configuration information, and a particular sensing signal receiver may be configured to monitor one or more of the segments in the GC-DCI. For example, in some aspects, the segments to be monitored by the sensing signal receiver may be configured via RRC signaling, a MAC-CE, or a separate DCI. Additionally, or alternatively, the segment (s) to be monitored by the sensing signal receiver may be predefined, or may be determined based on an implementation of the sensing signal receiver. In this way, the sensing signal receiver may be configured to simultaneously monitor and decode PUSCH transmissions by and/or PDSCH transmissions to multiple UEs, which may generally improve passive sensing resolution.

As further shown in Fig. 5, and by reference number 530, the sensing signal transmitter may transmit one or more reference signals and/or data channels, which may arrive at the sensing signal receiver via multipath propagation. For example, as described above, the sensing signal transmitter may transmit the reference signals and/or data channels that are configured to be used for passive sensing in one or more directions (e.g., using one or more directional beams) . Accordingly, the reference signal and/or data channel transmissions may arrive at the sensing signal receiver via multiple paths, which may include an LoS path, a backscattered path in which the reference signal and/or data channel transmissions reflect off the target object to be sensed, and/or the like.

In some aspects, as further shown in Fig. 5, and by reference number 540, the sensing signal receiver may process the signal transmissions to sense the target object (s) in the surrounding environment based at least in part on the passive sensing configuration information provided in the DCI. For example, the sensing signal receiver may be configured to monitor the one or more reference signals that are configured to be used for passive sensing to estimate a frequency domain channel response, and may further decode the one or more data channels that are configured for passive sensing using decoding information indicated in the DCI such that information associated with the decoded data channel (s) can be used to refine the estimated frequency domain channel response. For example, in some aspects, the reference signal and/or data channel transmissions may be received by the sensing signal receiver in a time domain, and the sensing signal receiver may remove a cyclic prefix and perform a fast Fourier transform (FFT) after sampling the incoming signals to estimate the frequency domain channel response. The sensing signal receiver may then perform a subsequent inverse FFT (iFFT) on the frequency domain channel response in one shot to obtain a time-domain multipath delay, which may be referred to as “fast time” . In some aspects, the sensing signal receiver may use another Doppler-FFT filter band along a “slow time” , in which each FFT is applied to the same delay path across multiple “fast time” shots, and the signal may then be transferred to a Doppler-domain for Doppler estimation and filtering. In some aspects, the Doppler-FFT window size may be limited by the moving speed of the target object and the respective delay relative to the width of any delay-bin on the “fast-time” axis. Furthermore, the Doppler-FFT window size may be maximized to enable a signal-to-noise ratio (SNR) gain and detect weak target returns. Accordingly, the sensing signal receiver may then detect the target object using a Delay-Doppler spreading function (also referred to as a scattering function) . In this way, the DCI that indicates the passive sensing configuration information may enable the sensing signal receiver to monitor certain reference signals and/or decode data channel information that can be processed using legacy OFDM symbol processing techniques to reliably detect objects in the surrounding environment.

As indicated above, Fig. 5 is provided as an example. Other examples may differ from what is described with regard to Fig. 5.

Fig. 6 is a diagram illustrating an example process 600 performed, for example, by a receiver, in accordance with various aspects of the present disclosure. Example process 600 is an example where the receiver (e.g., UE 120, base station 110, sensing signal receiver 420, and/or the like) performs operations associated with a DCI indication for passive sensing.

As shown in Fig. 6, in some aspects, process 600 may include receiving, from a transmitter, DCI indicating passive sensing configuration information, wherein the passive sensing configuration information indicates one or more reference signals transmitted by the transmitter that are configured to be used for passive sensing (block 610) . For example, the receiver may receive (e.g., using antenna 234, DEMOD 232, MIMO detector 236, receive processor 238, controller/processor 240, antenna 252, DEMOD 254, MIMO detector 256, receive processor 258, controller/processor 280, and/or the like) , from a transmitter, DCI indicating passive sensing configuration information, as described above. In some aspects, the passive sensing configuration information indicates one or more reference signals transmitted by the transmitter that are configured to be used for passive sensing.

As further shown in Fig. 6, in some aspects, process 600 may include monitoring the one or more reference signals transmitted by the transmitter to sense one or more objects in an environment surrounding the receiver based at least in part on the passive sensing configuration information indicated in the DCI (block 620) . For example, the receiver may monitor (e.g., using antenna 234, DEMOD 232, MIMO detector 236, receive processor 238, controller/processor 240, antenna 252, DEMOD 254, MIMO detector 256, receive processor 258, controller/processor 280, and/or the like) the one or more reference signals transmitted by the transmitter to sense one or more objects in an environment surrounding the receiver based at least in part on the passive sensing configuration information indicated in the DCI, as described above.

Process 600 may include additional aspects, such as any single aspect or any combination of aspects described below and/or in connection with one or more other processes described elsewhere herein.

In a first aspect, the passive sensing configuration information further indicates decoding information associated with one or more data channels transmitted by the transmitter.

In a second aspect, alone or in combination with the first aspect, process 600 includes receiving an RRC configuration including information to decode the passive sensing configuration information indicated in the DCI, and decoding one or more fields in the DCI that indicate the passive sensing configuration information based at least in part on the RRC configuration.

In a third aspect, alone or in combination with one or more of the first and second aspects, process 600 includes descrambling the DCI based at least in part on a passive sensing RNTI, wherein the passive sensing RNTI is configured by the transmitter or derived by the receiver based at least in part on one or more parameters indicated by the transmitter.

In a fourth aspect, alone or in combination with one or more of the first through third aspects, the DCI is received in a PDCCH transmission or a PDSCH transmission.

In a fifth aspect, alone or in combination with one or more of the first through fourth aspects, the DCI is based at least in part on a DCI format used to schedule PUSCH or PDSCH transmissions.

In a sixth aspect, alone or in combination with one or more of the first through fifth aspects, the DCI includes one or more bits to indicate that the DCI indicates the passive sensing configuration information without scheduling a PUSCH transmission or a PDSCH transmission.

In a seventh aspect, alone or in combination with one or more of the first through sixth aspects, the DCI omits one or more fields associated with the DCI format used to schedule PUSCH or PDSCH transmissions.

In an eighth aspect, alone or in combination with one or more of the first through seventh aspects, the one or more fields omitted from the DCI include one or more of an NDI field, a HARQ process identifier field, a TPC field, a DAI field, an SRS request field, an SRI field, a TPMI indicator field, a CSI-RS request field, a PUCCH resource indicator field, or a PDSCH-to-HARQ feedback timing indicator field.

In a ninth aspect, alone or in combination with one or more of the first through eighth aspects, the one or more fields omitted from the DCI further include one or more of a padding bits field, an MCS field, an RV field, a CBGTI field, a PTRS-to-DMRS association field, a beta offsets field, an uplink scheduling indicator field, a VRB-to-PRB mapping field, a rate matching indicator field, a ZP CSI-RS trigger field, or a CBGFI field based at least in part on the one or more reference signals that are configured to be used for passive sensing including only a DMRS.

In a tenth aspect, alone or in combination with one or more of the first through ninth aspects, the one or more fields omitted from the DCI are based at least in part on a type of the one or more reference signals that are configured to be used for passive sensing.

In an eleventh aspect, alone or in combination with one or more of the first through tenth aspects, the DCI includes one or more of an NDI field, a HARQ process identifier field, or a DAI field.

In a twelfth aspect, alone or in combination with one or more of the first through eleventh aspects, process 600 includes receiving downlink signaling indicating one or more fields included in the DCI.

In a thirteenth aspect, alone or in combination with one or more of the first through twelfth aspects, the DCI is based at least in part on a GC-DCI format including multiple segments that each include a payload to indicate passive sensing configuration information.

In a fourteenth aspect, alone or in combination with one or more of the first through thirteenth aspects, the receiver is configured to monitor one or more of the multiple segments to determine the passive sensing configuration information applicable to the receiver.

In a fifteenth aspect, alone or in combination with one or more of the first through fourteenth aspects, the DCI is scrambled with an RNTI assigned to the receiver after the receiver has completed an RRC connection setup procedure.

In a sixteenth aspect, alone or in combination with one or more of the first through fifteenth aspects, the one or more reference signals configured to be used for passive sensing include one or more of an SSB, a CSI-RS, a downlink PTRS, a PRS, a downlink DMRS, an SRS, an uplink PTRS, or an uplink DMRS.

In a seventeenth aspect, alone or in combination with one or more of the first through sixteenth aspects, the passive sensing configuration information further indicates one or more reference signal types that are not to be used for passive sensing, and the DCI excludes one or more fields that are based at least in part on the one or more reference signal types that are not to be used for passive sensing.

In an eighteenth aspect, alone or in combination with one or more of the first through seventeenth aspects, the one or more fields excluded from the DCI include fields that relate to scheduling the one or more reference signal types that are not to be used for passive sensing.

Although Fig. 6 shows example blocks of process 600, in some aspects, process 600 may include additional blocks, fewer blocks, different blocks, or differently arranged blocks than those depicted in Fig. 6. Additionally, or alternatively, two or more of the blocks of process 600 may be performed in parallel.

Fig. 7 is a diagram illustrating an example process 700 performed, for example, by a transmitter, in accordance with various aspects of the present disclosure. Example process 700 is an example where the transmitter (e.g., base station 110, UE 120, sensing signal transmitter 410, and/or the like) performs operations associated with a DCI indication for passive sensing.

As shown in Fig. 7, in some aspects, process 700 may include transmitting, to a receiver, DCI indicating passive sensing configuration information, wherein the passive sensing configuration information indicates one or more reference signals transmitted by the transmitter that are configured to be used for passive sensing (block 710) . For example, the transmitter may transmit (e.g., controller/processor 240, transmit processor 220, TX MIMO processor 230, MOD 232, antenna 234, controller/processor 280, transmit processor 264, TX MIMO processor 266, MOD 254, antenna 252, and/or the like) , to a receiver, DCI indicating passive sensing configuration information, as described above. In some aspects, the passive sensing configuration information indicates one or more reference signals transmitted by the transmitter that are configured to be used for passive sensing.

As further shown in Fig. 7, in some aspects, process 700 may include transmitting the one or more reference signals to enable the receiver to sense one or more objects in an environment surrounding the receiver based at least in part on the passive sensing configuration information indicated in the DCI (block 720) . For example, the transmitter may transmit (e.g., controller/processor 240, transmit processor 220, TX MIMO processor 230, MOD 232, antenna 234, controller/processor 280, transmit processor 264, TX MIMO processor 266, MOD 254, antenna 252, and/or the like) the one or more reference signals to enable the receiver to sense one or more objects in an environment surrounding the receiver based at least in part on the passive sensing configuration information indicated in the DCI, as described above.

Process 700 may include additional aspects, such as any single aspect or any combination of aspects described below and/or in connection with one or more other processes described elsewhere herein.

In a second aspect, alone or in combination with the first aspect, process 700 includes transmitting an RRC configuration including information to decode the passive sensing configuration information indicated in the DCI.

In a third aspect, alone or in combination with one or more of the first and second aspects, process 700 includes scrambling the DCI based at least in part on a passive sensing RNTI, wherein the passive sensing RNTI is configured by the transmitter or derived by the receiver based at least in part on one or more parameters indicated by the transmitter.

In a fourth aspect, alone or in combination with one or more of the first through third aspects, the DCI is transmitted in a PDCCH transmission or a PDSCH transmission.

In a twelfth aspect, alone or in combination with one or more of the first through eleventh aspects, process 700 includes transmitting downlink signaling indicating one or more fields included in the DCI.

Although Fig. 7 shows example blocks of process 700, in some aspects, process 700 may include additional blocks, fewer blocks, different blocks, or differently arranged blocks than those depicted in Fig. 7. Additionally, or alternatively, two or more of the blocks of process 700 may be performed in parallel.

The foregoing disclosure provides illustration and description, but is not intended to be exhaustive or to limit the aspects to the precise form disclosed. Modifications and variations may be made in light of the above disclosure or may be acquired from practice of the aspects.

As used herein, the term “component” is intended to be broadly construed as hardware, firmware, and/or a combination of hardware and software. As used herein, a processor is implemented in hardware, firmware, and/or a combination of hardware and software. It will be apparent that systems and/or methods described herein may be implemented in different forms of hardware, firmware, and/or a combination of hardware and software. The actual specialized control hardware or software code used to implement these systems and/or methods is not limiting of the aspects. Thus, the operation and behavior of the systems and/or methods were described herein without reference to specific software code-it being understood that software and hardware can be designed to implement the systems and/or methods based, at least in part, on the description herein.

As used herein, satisfying a threshold may, depending on the context, refer to a value being greater than the threshold, greater than or equal to the threshold, less than the threshold, less than or equal to the threshold, equal to the threshold, not equal to the threshold, and/or the like.

Even though particular combinations of features are recited in the claims and/or disclosed in the specification, these combinations are not intended to limit the disclosure of various aspects. In fact, many of these features may be combined in ways not specifically recited in the claims and/or disclosed in the specification. Although each dependent claim listed below may directly depend on only one claim, the disclosure of various aspects includes each dependent claim in combination with every other claim in the claim set. A phrase referring to “at least one of” a list of items refers to any combination of those items, including single members. As an example, “at least one of: a, b, or c” is intended to cover a, b, c, a-b, a-c, b-c, and a-b-c, as well as any combination with multiples of the same element (e.g., a-a, a-a-a, a-a-b, a-a-c, a-b-b, a-c-c, b-b, b-b-b, b-b-c, c-c, and c-c-c or any other ordering of a, b, and c) .

No element, act, or instruction used herein should be construed as critical or essential unless explicitly described as such. Also, as used herein, the articles “a” and “an” are intended to include one or more items and may be used interchangeably with “one or more. ” Further, as used herein, the article “the” is intended to include one or more items referenced in connection with the article “the” and may be used interchangeably with “the one or more. ” Furthermore, as used herein, the terms “set” and “group” are intended to include one or more items (e.g., related items, unrelated items, a combination of related and unrelated items, and/or the like) , and may be used interchangeably with “one or more. ” Where only one item is intended, the phrase “only one” or similar language is used. Also, as used herein, the terms “has, ” “have, ” “having, ” and/or the like are intended to be open-ended terms. Further, the phrase “based on” is intended to mean “based, at least in part, on” unless explicitly stated otherwise. Also, as used herein, the term “or” is intended to be inclusive when used in a series and may be used interchangeably with “and/or, ” unless explicitly stated otherwise (e.g., if used in combination with “either” or “only one of” ) .

Claims

A method of wireless communication performed by a receiver, comprising:

receiving, from a transmitter, downlink control information (DCI) indicating passive sensing configuration information, wherein the passive sensing configuration information indicates one or more reference signals transmitted by the transmitter that are configured to be used for passive sensing; and

monitoring the one or more reference signals transmitted by the transmitter to sense one or more objects in an environment surrounding the receiver based at least in part on the passive sensing configuration information indicated in the DCI.
The method of claim 1, wherein the passive sensing configuration information further indicates decoding information associated with one or more data channels transmitted by the transmitter.
The method of claim 1, further comprising:

receiving a radio resource control (RRC) configuration including information to decode the passive sensing configuration information indicated in the DCI; and

decoding one or more fields in the DCI that indicate the passive sensing configuration information based at least in part on the RRC configuration.
The method of claim 1, further comprising:

descrambling the DCI based at least in part on a passive sensing radio network temporary identifier (RNTI) , wherein the passive sensing RNTI is configured by the transmitter or derived by the receiver based at least in part on one or more parameters indicated by the transmitter.
The method of claim 1, wherein the DCI is received in a physical downlink control channel transmission or a physical downlink shared channel transmission.
The method of claim 1, wherein the DCI is based at least in part on a DCI format used to schedule physical uplink shared channel (PUSCH) or physical downlink shared channel (PDSCH) transmissions.
The method of claim 6, wherein the DCI includes one or more bits to indicate that the DCI indicates the passive sensing configuration information without scheduling a PUSCH transmission or a PDSCH transmission.
The method of claim 6, wherein the DCI omits one or more fields associated with the DCI format used to schedule PUSCH or PDSCH transmissions.
The method of claim 8, wherein the one or more fields omitted from the DCI include one or more of a new data indicator field, a hybrid automatic repeat request (HARQ) process identifier field, a transmit power control field, a downlink assignment index field, a sounding reference signal (SRS) request field, an SRS resource indicator field, a transmit precoder matrix indicator field, a channel state information reference signal request field, a physical uplink control channel resource indicator field, or a PDSCH-to-HARQ feedback timing indicator field.
The method of claim 9, wherein the one or more fields omitted from the DCI further include one or more of a padding bits field, a modulation and coding scheme field, a redundancy version field, a code block group (CBG) transmission indicator field, a phase tracking reference signal to demodulation reference signal (DMRS) association field, a beta offsets field, an uplink scheduling indicator field, a virtual resource block to physical resource block mapping field, a rate matching indicator field, a zero power channel state information reference signal trigger field, or a CBG flush indicator field based at least in part on the one or more reference signals that are configured to be used for passive sensing including only a DMRS.
The method of claim 8, wherein the one or more fields omitted from the DCI are based at least in part on a type of the one or more reference signals that are configured to be used for passive sensing.
The method of claim 6, wherein the DCI includes one or more of a new data indicator field, a hybrid automatic repeat request process identifier field, or a downlink assignment index field.
The method of claim 6, further comprising:

receiving downlink signaling indicating one or more fields included in the DCI.
The method of claim 1, wherein the DCI is based at least in part on a group common DCI format including multiple segments that each include a payload to indicate passive sensing configuration information.
The method of claim 14, wherein the receiver is configured to monitor one or more of the multiple segments to determine the passive sensing configuration information applicable to the receiver.
The method of claim 1, wherein the DCI is scrambled with a radio network temporary identifier assigned to the receiver after the receiver has completed a radio resource control connection setup procedure.
The method of claim 1, wherein the one or more reference signals configured to be used for passive sensing include one or more of a synchronization signal block, a channel state information reference signal, a downlink phase tracking reference signal (PTRS) , a positioning reference signal, a downlink demodulation reference signal (DMRS) , a sounding reference signal, an uplink PTRS, or an uplink DMRS.
The method of claim 1, wherein the passive sensing configuration information further indicates one or more reference signal types that are not to be used for passive sensing, and wherein the DCI excludes one or more fields that are based at least in part on the one or more reference signal types that are not to be used for passive sensing.
The method of claim 18, wherein the one or more fields excluded from the DCI include fields that relate to scheduling the one or more reference signal types that are not to be used for passive sensing.
A method of wireless communication performed by a transmitter, comprising:

transmitting, to a receiver, downlink control information (DCI) indicating passive sensing configuration information, wherein the passive sensing configuration information indicates one or more reference signals transmitted by the transmitter that are configured to be used for passive sensing; and

transmitting the one or more reference signals to enable the receiver to sense one or more objects in an environment surrounding the receiver based at least in part on the passive sensing configuration information indicated in the DCI.
The method of claim 20, wherein the passive sensing configuration information further indicates decoding information associated with one or more data channels transmitted by the transmitter.
The method of claim 20, further comprising:

transmitting a radio resource control (RRC) configuration including information to decode the passive sensing configuration information indicated in the DCI.
The method of claim 20, further comprising:

scrambling the DCI based at least in part on a passive sensing radio network temporary identifier (RNTI) , wherein the passive sensing RNTI is configured by the transmitter or derived by the receiver based at least in part on one or more parameters indicated by the transmitter.
The method of claim 20, wherein the DCI is transmitted in a physical downlink control channel transmission or a physical downlink shared channel transmission.
The method of claim 20, wherein the DCI is based at least in part on a DCI format used to schedule physical uplink shared channel (PUSCH) or physical downlink shared channel (PDSCH) transmissions.
The method of claim 25, wherein the DCI includes one or more bits to indicate that the DCI indicates the passive sensing configuration information without scheduling a PUSCH transmission or a PDSCH transmission.
The method of claim 25, wherein the DCI omits one or more fields associated with the DCI format used to schedule PUSCH or PDSCH transmissions.
The method of claim 27, wherein the one or more fields omitted from the DCI include one or more of a new data indicator field, a hybrid automatic repeat request (HARQ) process identifier field, a transmit power control field, a downlink assignment index field, a sounding reference signal (SRS) request field, an SRS resource indicator field, a transmit precoder matrix indicator field, a channel state information reference signal request field, a physical uplink control channel resource indicator field, or a PDSCH-to-HARQ feedback timing indicator field.
The method of claim 28, wherein the one or more fields omitted from the DCI further include one or more of a padding bits field, a modulation and coding scheme field, a redundancy version field, a code block group (CBG) transmission indicator field, a phase tracking reference signal to demodulation reference signal (DMRS) association field, a beta offsets field, an uplink scheduling indicator field, a virtual resource block to physical resource block mapping field, a rate matching indicator field, a zero power channel state information reference signal trigger field, or a CBG flush indicator field based at least in part on the one or more reference signals that are configured to be used for passive sensing including only a DMRS.
The method of claim 27, wherein the one or more fields omitted from the DCI are based at least in part on a type of the one or more reference signals that are configured to be used for passive sensing.
The method of claim 25, wherein the DCI includes one or more of a new data indicator field, a hybrid automatic repeat request process identifier field, or a downlink assignment index field.
The method of claim 25, further comprising:

transmitting downlink signaling indicating one or more fields included in the DCI.
The method of claim 20, wherein the DCI is based at least in part on a group common DCI format including multiple segments that each include a payload to indicate passive sensing configuration information.
The method of claim 33, wherein the receiver is configured to monitor one or more of the multiple segments to determine the passive sensing configuration information applicable to the receiver.
The method of claim 20, wherein the DCI is scrambled with a radio network temporary identifier assigned to the receiver after the receiver has completed a radio resource control connection setup procedure.
The method of claim 20, wherein the one or more reference signals configured to be used for passive sensing include one or more of a synchronization signal block, a channel state information reference signal, a downlink phase tracking reference signal (PTRS) , a positioning reference signal, a downlink demodulation reference signal (DMRS) , a sounding reference signal, an uplink PTRS, or an uplink DMRS.
The method of claim 20, wherein the passive sensing configuration information further indicates one or more reference signal types that are not to be used for passive sensing, and wherein the DCI excludes one or more fields that are based at least in part on the one or more reference signal types that are not to be used for passive sensing.
The method of claim 37, wherein the one or more fields excluded from the DCI include fields that relate to scheduling the one or more reference signal types that are not to be used for passive sensing.
A receiver for wireless communication, comprising:

a memory; and

one or more processors operatively coupled to the memory, the memory and the one or more processors configured to:

receive, from a transmitter, downlink control information (DCI) indicating passive sensing configuration information, wherein the passive sensing configuration information indicates one or more reference signals transmitted by the transmitter that are configured to be used for passive sensing; and

monitor the one or more reference signals transmitted by the transmitter to sense one or more objects in an environment surrounding the receiver based at least in part on the passive sensing configuration information indicated in the DCI.
A transmitter for wireless communication, comprising:

a memory; and

one or more processors operatively coupled to the memory, the memory and the one or more processors configured to:

transmit, to a receiver, downlink control information (DCI) indicating passive sensing configuration information, wherein the passive sensing configuration information indicates one or more reference signals transmitted by the transmitter that are configured to be used for passive sensing; and

transmit the one or more reference signals to enable the receiver to sense one or more objects in an environment surrounding the receiver based at least in part on the passive sensing configuration information indicated in the DCI.
A non-transitory computer-readable medium storing one or more instructions for wireless communication, the one or more instructions comprising:

one or more instructions that, when executed by one or more processors of a receiver, cause the one or more processors to:

receive, from a transmitter, downlink control information (DCI) indicating passive sensing configuration information, wherein the passive sensing configuration information indicates one or more reference signals transmitted by the transmitter that are configured to be used for passive sensing; and

monitor the one or more reference signals transmitted by the transmitter to sense one or more objects in an environment surrounding the receiver based at least in part on the passive sensing configuration information indicated in the DCI.
A non-transitory computer-readable medium storing one or more instructions for wireless communication, the one or more instructions comprising:

one or more instructions that, when executed by one or more processors of a transmitter, cause the one or more processors to:

transmit, to a receiver, downlink control information (DCI) indicating passive sensing configuration information, wherein the passive sensing configuration information indicates one or more reference signals transmitted by the transmitter that are configured to be used for passive sensing; and

transmit the one or more reference signals to enable the receiver to sense one or more objects in an environment surrounding the receiver based at least in part on the passive sensing configuration information indicated in the DCI.
An apparatus for wireless communication, comprising:

means for receiving, from a transmitter, downlink control information (DCI) indicating passive sensing configuration information, wherein the passive sensing configuration information indicates one or more reference signals transmitted by the transmitter that are configured to be used for passive sensing; and

means for monitoring the one or more reference signals transmitted by the transmitter to sense one or more objects in an environment surrounding the apparatus based at least in part on the passive sensing configuration information indicated in the DCI.
An apparatus for wireless communication, comprising:

means for transmitting, to a receiver, downlink control information (DCI) indicating passive sensing configuration information, wherein the passive sensing configuration information indicates one or more reference signals transmitted by the apparatus that are configured to be used for passive sensing; and

means for transmitting the one or more reference signals to enable the receiver to sense one or more objects in an environment surrounding the receiver based at least in part on the passive sensing configuration information indicated in the DCI.