Orthogonal time frequency space (OTFS) radar resource signaling

Abstract

This disclosure provides systems, devices, apparatus, and methods, including computer programs encoded on storage media, for radar sensing assistance. A UE (102) receives (222), from a network entity (104), a first resource grant. The first resource grant is for propagation of an orthogonal time-frequency space, OTFS, signal between a transmitter (102E, 104) and a receiver (102E, 102F, 104). The UE (102) performs (230, 234), according to the first resource grant, a radar signaling procedure based on the propagation of the OTFS signal between the transmitter (102E, 104) and the receiver (102E, 102F, 104).

Description

ORTHOGONAL TIME FREQUENCY SPACE (OTFS) RADAR RESOURCE SIGNALINGCROSS-REFERENCE TO RELATED APPLICATIONS

[0001] This application claims the benefit of U.S. Provisional Patent Application No. US63 / 596,138, filed 3 November 2023 the disclosure of which is incorporated herein by reference in its entirety.TECHNICAL FIELD

[0002] The present disclosure relates generally to wireless communication, and more particularly, to orthogonal time frequency space (OTFS) signaling.BACKGROUND

[0003] The Third Generation Partnership Project (3 GPP) specifies a radio interface referred to as fifth generation (5G) new radio (NR) (5G NR). An architecture for a 5G NR wireless communication system includes a 5G core (5GC) network, a 5G radio access network (5G-RAN), a user equipment (5G UE), etc. The 5G NR architecture seeks to provide increased data rates, decreased latency, and / or increased capacity compared to prior generation cellular communication systems.

[0004] Wireless communication systems, in general, provide various telecommunication services (e.g., telephony, video, data, messaging, etc.) based on multiple-access technologies, such as orthogonal frequency division multiple access (OFDMA) technologies, that support communication with multiple UEs. Improvements in mobile broadband continue the progression of such wireless communication technologies. For example, orthogonal frequency division multiplexing (OFDM) waveforms can operate in the time and frequency domain to implement an integrated sensing and communication system. However, the OFDM waveform has a high peak- to-average power ratio (PAPR), which might result in decreased power efficiency at high-frequency carrier frequencies.BRIEF SUMMARY

[0005] The following presents a simplified summary of one or more aspects in order to provide a basic understanding of such aspects. This summary is not an extensiveoverview of all contemplated aspects. This summary neither identifies key or critical elements of all aspects nor delineates the scope of any or all aspects. Its sole purpose is to present some concepts of one or more aspects in a simplified form as a prelude to the more detailed description that is presented later.

[0006] Next generation wireless networks, such as fifth generation (5G) or sixth generation (6G) and beyond, provide ultra-high speeds, ultra-high capacity, and ultralow latency to match ever-increasing bandwidth demand. One of the key enablers to next generation wireless networks is an integrated sensing and communication system that uses a wireless signal for both communication and radar sensing. The integrated sensing and communication system improves energy and spectral efficiencies, while reducing signaling overhead. Many studies have focused on using orthogonal frequency division multiplexing (OFDM) waveforms that operate in the time and frequency domain to implement the integrated sensing and communication system. However. OFDM waveforms might have limitations in some implementations. For example, the OFDM waveform has a high peak-to-average power ratio (PAPR), which might result in decreased power efficiency at high-frequency carrier frequencies.

[0007] Aspects of the present disclosure address the above-noted and other deficiencies by turning to an orthogonal time frequency space (OTFS) modulation technique. Transmission of the OTFS waveform is on symbols in the delay -Doppler domain and can be used for both communication and radar sensing. While an OFDM resource element (RE) occupies one subcarrier on one OFDM symbol in a two-dimensional grid of time-frequency domain, in OTFS, the RE is defined in a two-dimensional grid of the delay-Doppler domain.

[0008] In a first example, a requestor device, such as user equipment (UE), sends a request to a network entity to perform the radar sensing using the OTFS radar signal. This request and other control signaling between the UE and the network entity is based on OFDM. The network entity sends control signaling indicating an OTFS resource grant for propagation of a radar signal from a radar transmitter to a radar receiver. The radar transmitter may be the UE or the network entity. The radar receiver may be the UE, a second UE, or in some instances, the network entity. In either case, the requestor device receives, from the radar receiver, object detection information based on a measurement of the OTFS radar signal propagated between the radar transmitter and the radar receiver. OTFS dimensions (delay-Doppler) arethe same dimensions used for radar sensing calculations, and thus OTFS receivers are engineered to accurately receive and quantify delay-Doppler changes, which can be used to calculate the position and speed of an object. The OTFS radar signal addresses characteristics associated with time-varying multipath channels from which the OFDM based waveforms-radar sensing suffers. For example, the OFDM based waveforms suffer significant degradations under high Doppler conditions that are often found in high-mobility environments. Delay spread-Doppler plane domains of the OTFS modulation are related to the time and frequency domains by a Fourier Transform. The delay-Doppler domains define REs and provide a 2-D grid similar to the OFDM modulation. Regardless of whether the network entity or the UE operates as the radar transmitter, the network entity can calculate an object location based on the measurement information and indicate the object location to the requestor device via the object detection information.

[0009] According to some aspects, a network entity transmits to a UE (and the UE receives from the network entity) a first resource grant. The first resource grant is for propagation of an OTFS signal between a transmitter and a receiver. The UE performs, according to the first resource grant, a radar signaling procedure based on the propagation of the OTFS signal between the transmitter and the receiver. For example, the UE transmits to the network entity (and the network entity receives from the UE) a radar measurement report message associated with the propagation of the OTFS signal between the transmitter and the receiver. The network entity transmits to the UE (and the UE receives from the network entity) object information obtained in response to the receiving the radar measurement report.BRIEF DESCRIPTION OF THE DRAWINGS

[0010] FIG. 1A illustrates a diagram of a wireless communications system that includes a plurality of user equipments (UEs) and network entities in communication over one or more cells according to an embodiment.

[0011] FIGs. 1B-1C are diagrams illustrating example environments for implementing radar sensing using an orthogonal time frequency space (OTFS) signal according to some embodiments.

[0012] FIG. 2 is a signaling diagram that illustrates procedures for radar sensing with the UE as a transmitter according to an embodiment.

[0013] FIG. 3 is a signaling diagram that illustrates procedures for radar sensing with the network entity as a transmitter according to an embodiment.

[0014] FIG. 4A is a signaling diagram that illustrates procedures for radar sensing with the network entity as a transmitter and a second UE as a receiver according to an embodiment.

[0015] FIG. 4B is a signaling diagram that illustrates procedures for radar sensing with the UE as a transmitter and a second UE as a receiver according to an embodiment.

[0016] FIG. 5 is a flowchart of a method of radar sensing at a UE according to an embodiment.

[0017] FIG. 6 is a flowchart of a method of radar sensing at an assistor UE according to an embodiment.

[0018] FIG. 7 is a flowchart of a method of radar sensing at a network entity according to an embodiment.

[0019] FIG. 8 is a diagram illustrating a hardware implementation for an example UE apparatus according to some embodiments.

[0020] FIG. 9 is a diagram illustrating a hardware implementation for one or more example network entities according to some embodiments.DETAILED DESCRIPTION

[0021] FIG. 1 A illustrates a diagram 100 of a wireless communications system associated with a plurality of cells 190. The wireless communications system includes user equipments (UEs) 102 and base stations / network entities 104. One or more UEs 102 may include a radar device 103e. 103fand one or more base stations 104e may include a radar device 103g. The UEs 102 may communicate with the base stations 104 via one or more radio frequency (RF) access links 178. A downlink portion of the access link 178 may be combined with a radar signal to result in a combined radar and communication signal. This combined radar and communication signal may use orthogonal time frequency space (OTFS) modulation or orthogonal frequencydivision multiplexing (OFDM) modulation. The UEs 102 may transmit to the network entity 104, information using an uplink portion of the access link 178. The UEs 102 can perform radar sensing for imaging an environment or determining information about an object based a reflection of the radar signal 174.

[0022] Some base stations may include an aggregated base station architecture and other base stations may include a disaggregated base station architecture. The aggregatedbase station architecture utilizes a radio protocol stack that is physically or logically integrated within a single radio access network (RAN) node. A disaggregated base station architecture utilizes a protocol stack that is physically or logically distributed among two or more units (e.g., radio unit (RU) 106, distributed unit (DU) 108, central unit (CU) 110). For example, a CU 110 is implemented within a RAN node, and one or more DUs 108 may be co-located with the CU 110, or alternatively, may be geographically or virtually distributed throughout one or multiple other RAN nodes. The DUs 108 may be implemented to communicate with one or more RUs 106. Any of the RU 106, the DU 108 and the CU 110 can be implemented as virtual units, such as a virtual radio unit (VRU), a virtual distributed unit (VDU), or a virtual central unit (VCU). The base station / network entity 104 (e.g., an aggregated base station or disaggregated units of the base station, such as the RU 106 or the DU 108), may be referred to as a transmission reception point (TRP).

[0023] Operations of the base station 104 and / or network designs may be based on aggregation characteristics of base station functionality. For example, disaggregated base station architectures are utilized in an integrated access backhaul (TAB) network, an open-radio access network (O-RAN) network, or a virtualized radio access network (vRAN), which may also be referred to a cloud radio access network (C- RAN). Disaggregation may include distributing functionality across the two or more units at various physical locations, as well as distributing functionality' for at least one unit virtually, which can enable flexibility in network designs. The various units of the disaggregated base station architecture, or the disaggregated RAN architecture, can be configured for wired or wireless communication with at least one other unit. For example, the base stations 104d, 104e and / or the RUs 106a, 106b, 106c, 106d may communicate with the UEs 102a, 102b, 102c, 102d, 102e, 102f and / or 102s via one or more radio frequency (RF) access links based on a Uu interface. In examples, multiple RUs 106 and / or base stations 104 may simultaneously serve the UEs 102. such as by intra-cell and / or inter-cell access links between the UEs 102 and the RUs 106 / base stations 104.

[0024] The RU 106, the DU 108, and the CU 110 may include (or may be coupled to) one or more interfaces configured to transmit or receive information / signals via a wired or wireless transmission medium. For example, a wired interface can be configured to transmit or receive the information / signals over a wired transmission medium, such as via the fronthaul link 160 between the RU 106d and the basebandunit (BBU) 112 of the base station 104d associated with the cell 190d. The BBU 112 includes a DU 108 and a CU 110, which may also have a wired interface (e g., midhaul link) configured between the DU 108 and the CU 110 to transmit or receive the information / signals between the DU 108 and the CU 110. In further examples, a wireless interface, which may include a receiver, a transmitter, or a transceiver, such as an RF transceiver, configured to transmit and / or receive the information / signals via the wireless transmission medium, such as for information communicated between the RU 106a of the cell 190a and the base station 104e of the cell 190e via cross-cell communication beams 136-138 of the RU 106a and the base station 104e.

[0025] The RUs 106 may be configured to implement lower layer functionality. For example, the RU 106 is controlled by the DU 108 and may correspond to a logical node that hosts RF processing functions, or lower layer PHY functionality, such as execution of fast Fourier transform (FFT), inverse FFT (iFFT), digital beamforming, physical random access channel (PRACH) extraction and filtering, etc. The functionality of the RU 106 may be based on the functional split, such as a functional split of lower layers.

[0026] The RUs 106 may transmit or receive over-the-air (OTA) communication with one or more UEs 102. For example, the RU 106b of the cell 190b communicates with the UE 102b of the cell 190b via a first set of communication beams 132 of the RU 106b and a second set of communication beams 134b of the UE 102b, which may correspond to inter-cell communication beams or, in some examples, cross-cell communication beams. For instance, the UE 102b of the cell 190b may communicate with the RU 106a of the cell 190a via a third set of communication beams 134a of the UE 102b and a fourth set of communication beams 136 of the RU 106a. DUs 108 can control both real-time and non-real-time features of control plane and user plane communications of the RUs 106.

[0027] Any combination of the RU 106, the DU 108, and the CU 110, or reference thereto individually, may correspond to a base station 104. Thus, the base station 104 may include at least one of the RU 106, the DU 108, or the CU 110. The base stations 104 provide the UEs 102 with access to a core network. The base stations 104 may relay communications between the UEs 102 and the core network (not shown). The base stations 104 may be associated with macrocells for higher-power cellular base stations and / or small cells for lower-power cellular base stations. For example, the cell 190e may correspond to a macrocell, whereas the cells 190a-190d may correspond to smallcells. Small cells include femtocells, picocells, microcells, etc. A network that includes at least one macrocell and at least one small cell may be referred to as a “heterogeneous network.”

[0028] Transmissions from a UE 102 to a base station 104 / RU 106 are referred to as uplink (UL) transmissions, whereas transmissions from the base station 104 / RU 106 to the UE 102 are referred to as downlink (DL) transmissions. Uplink transmissions may also be referred to as reverse link transmissions and downlink transmissions may also be referred to as forward link transmissions. For example, the RU 106d utilizes antennas of the base station 104d of cell 190d to transmit a downlink / forward link communication to the UE 102d or receive an uplink / reverse link communication from the UE 102d based on the Uu interface associated with the access link between the UE 102d and the base station 104d / RU 106d.

[0029] Communication links bet een the UEs 102 and the base stations 104 / RUs 106 may be based on multiple-input and multiple-output (MIMO) antenna technology, including spatial multiplexing, beamforming, and / or transmit diversity. The communication links may be associated with one or more carriers. The UEs 102 and the base stations 104 / RUs 106 may utilize a spectrum bandwidth of F MHz (e.g., 5, 10, 15, 20, 100, 400, 800. 1600, 2000, etc. MHz) per earner allocated in a carrier aggregation of up to a total of Yx MHz, where x component carriers (CCs) are used for communication in each of the uplink and downlink directions. The carriers may or may not be adjacent to each other along a frequency spectrum. In examples, uplink and downlink carriers may be allocated in an asymmetric manner, with more or fewer carriers allocated to either the uplink or the downlink. A primary component carrier and one or more secondary component carriers may be included in the component carriers. The primary' component carrier may be associated w ith a primary' cell (PCell) and a secondary' component carrier may be associated with a secondary cell (SCell).

[0030] Some UEs 102, such as the UEs 102a and 102s, may perform device-to-device (D2D) communications over sidelink. For example, a sidelink communication / D2D link utilizes a spectrum for a wireless wide area network (WWAN) associated with uplink and downlink communications. Such sidelink / D2D communication may be performed through various wireless communications systems, such as wireless fidelity (Wi-Fi) systems, Bluetooth systems, Long Term Evolution (LTE) systems. New Radio (NR) systems, etc.

[0031] The UEs 102 and the base stations 104 / RUs 106 may each include a plurality of antennas. The plurality of antennas may correspond to antenna elements, antenna panels, and / or antenna arrays that may facilitate beamforming operations. For example, the RU 106b transmits a downlink beamformed signal based on a first set of communication beams 132 to the UE 102b in one or more transmit directions of the RU 106b. The UE 102b may receive the downlink beamformed signal based on a second set of communication beams 134b from the RU 106b in one or more receive directions of the UE 102b. In a further example, the UE 102b may also transmit an uplink beamformed signal (e.g.. sounding reference signal (SRS)) to the RU 106b based on the second set of communication beams 134b in one or more transmit directions of the UE 102b. The RU 106b may receive the uplink beamformed signal from the UE 102b in one or more receive directions of the RU 106b. The UE 102b may perform beam training to determine the best receive and transmit directions for the beamformed signals. The transmit and receive directions for the UEs 102 and the base stations 104 / RUs 106 may or may not be the same.

[0032] In further examples, beamformed signals may be communicated between a first base station / RU 106a and a second base station 104e. For instance, the base station 104e of the cell 190e may transmit a beamformed signal to the RU 106a based on the communication beams 138 in one or more transmit directions of the base station 104e. The RU 106a may receive the beamformed signal from the base station 104e of the cell 190e based on the RU communication beams 136 in one or more receive directions of the RU 106a. In further examples, the base station 104e transmits a downlink beamformed signal to the UE 102e based on the communication beams 138 in one or more transmit directions of the base station 104e. The UE 102e receives the downlink beamformed signal from the base station 104e based on UE communication beams 130 in one or more receive directions of the UE 102e. The UE 102e may also transmit an uplink beamformed signal to the base station 104e based on the UE communication beams 130 in one or more transmit directions of the UE 102e, such that the base station 104e may receive the uplink beamformed signal from the UE 102e in one or more receive directions of the base station 104e. The UE 102f receives the downlink beamformed signal from the base station 104e based on UE communication beams 131 in one or more receive directions of the UE 102f. The UE 102f may also transmit an uplink beamformed signal to the base station 104e based on the UE communication beams 131 in one or more transmit directions of the UE102f. such that the base station 104e may receive the uplink beamformed signal from the UE 102f in one or more receive directions of the base station 104e.

[0033] The UEs 102 and the base stations 104 may include radar devices 103. For example, the UE 102e includes a first radar device 103e, the UE 102f includes a second radar device 103f, and the base station 104e includes a third radar device 103g. The base station 104 may include and / or be referred to as a network entity. That is, “network entity” may refer to the base station 104 or at least one unit of the base station 104, such as the RU 106, the DU 108. and / or the CU 110. The base station 104 may also include and / or be referred to as a next generation evolved Node B (ng- eNB), a next generation NB (gNB), an evolved NB (eNB), an access point, a base transceiver station, a radio base station, a radio transceiver, a transceiver function, a basic service set (BSS), an extended service set (ESS), a TRP, a network node, network equipment, or other related terminology. The base station 104 or an entity at the base station 104 can be implemented as an IAB node, a relay node, a sidelink node, an aggregated (monolithic) base station, or a disaggregated base station including one or more RUs 106, DUs 108, and / or CUs 110. A set of aggregated or disaggregated base stations may be referred to as a next generation-radio access network (NG-RAN). In some examples, the UE 102a operates in dual connectivity (DC) with the base station 104e and the base station / RU 106a. In such cases, the base station 104e can be a master node and the base station / RU 106a can be a secondary node.

[0034] Uplink / downlink signaling may also be communicated via a satellite positioning system (SPS) 1 14. In an example, the SPS 114 associated with the cell 190c may be in communication with one or more UEs 102, such as the UE 102c, and one or more base stations 104 / RUs 106, such as the RU 106c. The SPS 114 may correspond to one or more of a Global Navigation Satellite System (GNSS), a global position system (GPS), a non-terrestrial network (NTN), or other satellite position / location system. The SPS 114 may be associated with LTE signals, NR signals (e.g., based on round trip time (RTT) and / or multi-RTT), wireless local area network (WLAN) signals, a terrestrial beacon system (TBS), sensor-based information, NR enhanced cell ID (NR E-CID) techniques, downlink angle-of-departure (DL-AoD), downlink time difference of arrival (DL-TDOA), uplink time difference of arrival (UL-TDOA), uplink angle-of-arrival (UL-AoA), and / or other systems, signals, or sensors.

[0035] Still referring to FIG. 1A, in certain aspects, any of the UEs 102 may include an OTFS radar component 140e / 140f configured to receive, from the network entity 104, a first resource grant, the first resource grant being for propagation of an OTFS signal between a transmitter and a receiver; and perform, according to the first resource grant, a radar signaling procedure based on the propagation of the OTFS signal between the transmitter and the receiver.

[0036] In certain aspects, any of the base stations 104 or a network entity of the base stations 104 may include a radar assistance component 150 configured to transmit, to a UE. a first resource grant, the first resource grant being for propagation of an OTFS signal between a transmitter and a receiver; receive, from the UE, a radar measurement report message associated with the propagation of the OTFS signal between the transmitter and the receiver; and transmit, to the UE, object information obtained in response to the receiving the radar measurement report.

[0037] Accordingly. FIG. 1A describes a wireless communication system that may be implemented in connection with aspects of one or more other figures described herein. Further, although the following description may be focused on 5G NR, the concepts described herein may be applicable to other similar areas, such as 5G- Advanced and future versions. LTE, LTE-advanced (LTE-A), and other wireless technologies, such as 6G.

[0038] FIG. IB illustrates an example environment 170 for implementing radar sensing with an OTFS signal, according to some embodiments. The environment 170 includes UEs 102 (e.g., 102E, 102F corresponding to FIG. 1A elements 102e, 1021) and a network entity 104 (e.g.. FIG. 1A element 104e).

[0039] Referring to FIG. IB, the UE 102E can act as a transmitter transmitting an OTFS signal according to a transmit (Tx) grant configured by the network entity 104. The network entity 104, the UE 102F, or the UE 102E can act as a receiver to perform radar sensing with the UE 102E. Radar sensing can be used for imaging an environment or determining information about an object 176 in the environment based on range, Doppler, and / or angle information determined from a reflection (e.g., 180A, 180B, 180C) of the OTFS signal 174. Radar sensing can be employed for automotive radar, e.g., detecting an environment around a vehicle, nearby vehicles or items, detecting information for smart cruise control, collision avoidance, etc. Radar sensing can also be employed for gesture recognition, e.g., a human activity recognition, a hand motion recognition, a facial expression recognition, a keystroke detection, signlanguage detection, etc. Radar signal sensing can be employed to acquire contextual information, e.g., location detection, tracking, determining directions, range estimation, etc. Radar sensing can be employed to image an environment, e.g., to provide a 3-dimensional (3D) map for virtual reality (VR) or augmented reality (AR) applications. Radar devices can be employed to provide high resolution localization, e.g., for industrial Intemet-of-things (loT) applications. Radar sensing combined with communication (or also known as integrated sensing and communication) might be a key technology for the next-generation wireless network. For example, autonomous vehicles might require robust sensing capability while receiving from the network entity high-density information such as high-resolution maps.

[0040] The netw ork entity 104 communicates with the UEs 102 using access links 178, 179 (e.g., wireless downlinks 178A, 179A) for control and / or data communication. For example, the network entity 104 communicates control information and downlink data to the UEs 102. The UEs 102 communicate 178B, 179B control information and uplink data to the network entity 104. A downlink portion 178A, 179A or uplink portion 178B, 179B of an access link 178, 179 may be combined with an OTFS signal to result in a combined radar and communication signal.

[0041] The radar-requestor 102E receives, from the network entity 104. control signaling indicating a first resource grant. The first resource grant is for propagation of an OTFS signal between atransmitter 102E and the receiver 102F. The transmitter 102E can demodulate and decode the communication portion 179A of the signal to receive downlink information from the network entity 104.

[0042] FIG. IB shows the radar-requestor 102E acting as a transmitter in this example, transmits the OTFS signal 174 for radar sensing. As shown in FIG. IB, in a first example, the UE 102F acts as a receiver to assist the UE 102E to perform radar sensing (e.g., bi-static). The receiver / radar-assistor 102F receives a reflection 180A of the OTFS signal 174 reflected from the object 176 as well as the OTFS signal 174 directly (unreflected). In response to receiving the OTFS signal 174 (directly or reflected), in one example, the UE radar-assistor 102F transmits, to the network entity 104, radar signal measurement information which includes information about the object 176 using an uplink portion 179B of the access link 179. After receiving the radar signal measurement information, the network entity 104 calculates a location of the object 176 based on the radar signal measurement information. The radar-requestor 102E receives from the network entity 104 based on the OTFS signal, object informationassociated with the bi-static radar sensing. In another example, the UE radar-assistor 102F transmits, to the UE 102E, radar signal measurement information which includes information about the object 176 using a sidelink. After receiving the radar signal measurement information, the UE 102E calculates a location of the object 176 based on the radar signal measurement information. The radar-requestor 102E receives from the UE 102E based on the OTFS signal, object information associated with the bi-static radar sensing. In a further example, after receiving the radar signal measurement information, the UE 102E relays the radar signal measurement information to the network entity 104. The network entity 104 the calculates a location of the object 176 based on the radar signal measurement information. The radar-requestor 102E receives from the network entity 104 based on the OTFS signal, object information associated with the bi-static radar sensing.

[0043] Still referring to FIG. IB, in a second example, the network entity 104 acts as a receiver to assist the UE 102E to perform radar sensing (e.g., bi-static). The netw ork entity receives a reflection 180B of the OTFS signal 174 reflected from the object 176 as well as the OTFS signal 174 directly (unreflected). In response to receiving the OTFS signal 174 (directly or reflected), the network entity 104 performs radar reception processing to processes the OTFS signal. By processing the OTFS signal, the network entity 104 can assist the UE 102E with detection of the object 176.

[0044] In a third example, the UE 102E acts as a receiver to perform radar sensing (e.g., monostatic). The UE 102E receives a reflection 180C of the OTFS signal 174 reflected from the object 176 as well as the OTFS signal 174 directly (unreflected). In response to receiving the OTFS signal 174 (directly or reflected), the UE 102E performs radar reception processing to processes the OTFS signal. By processing the OTFS signal, the network entity’ 104 can assist the UE 102E with detection of the object 176. The UE 102E transmits, to the network entity 104, radar signal measurement information which includes information about the object 176 using an uplink portion 179B of the access link 179. After receiving the radar signal measurement information, the network entity 104 calculates a location of the object 176 based on the radar signal measurement information. The UE 102E receives from the network entity 104 based on the OTFS signal, object information associated with the radar sensing.

[0045] Thus, the UEs 102 and / or the netw ork entity' 104 performing radar sensing using the OTFS signal might overcome the limitations associated with radar sensing usingOFDM waveforms. In addition, the UEs 102 and / or the network entity 104 may add communication information to the OTFS signal to result in a combined radar and communication signal. Variants of FIG. IB include the UE 102E transmitting the OTFS signal and the receiver being a UE 102F, a network entity 104 such as base station 104, or the UE 102E.

[0046] FIG. 1C shows the network entity 104 transmitting the OTFS signal 174 for radar sensing. As shown in FIG. 1C, the UE 102E, the UE 102F, or the network entity 104 acts as receiver to assist the UE 102E to perform radar sensing. Other elements of FIG. IB are similar in FIG. 1C.

[0047] Accordingly, FIGs. 1A to 1C describe example environments in which various aspects of radar sensing may be implemented in connection with aspects of one or more other figures described herein, such as aspects illustrated in FIGs. 2-9.

[0048] FIG. 2 is a signaling diagram that illustrates example scenario 200 for radar sensing with a UE 102E as a radar-requestor and a network entity 104 as a radar- assistor, according to some embodiments. The network entity 104 corresponds to a base station or a unit of a base station, such as the RU 106, the DU 108, the CU 110, etc. In this embodiment, the radar-requestor operates as a transmitter while the radar- assistor operates as a receiver, as similarly shown in an embodiment of FIG. IB. In these examples, the OTFS signal may include communication information forming a combined radar and communication signal. Generally speaking, the network entity 104 performs bi-static radar sensing with the radar-requestor UE 102E and / or the radar-requestor UE 102E performs monostatic radar sensing with itself.

[0049] The radar-requestor (e.g., UE 102E) might transmit 202A, to the network entity 104, an OTFS capability message that indicates OTFS capabilities supported by the radar-requestor for the radar sensing with OTFS signal. For example, the UE 102E transmits 202A, to the network entity 104. an OTFS capability message (e.g., UECapabilitylnformation message) that indicates OTFS capabilities. The OTFS capability’ message includes at least one field for indicating at least one of: a UE capability’ to transmit and receive the OTFS signal; a UE capability' to transmit or receive the OTFS signal; a minimum delay between a reception of a Tx grant and a time that the UE performs OTFS signal transmission; a minimum delay between a reception of a Rx grant and a time that the UE receives or processes the OTFS signal; or a minimum delay between OTFS signal reception processing and a time that the UE performs a radar measurement report transmission. In some aspects, the radar-requestor UE 102E transmits 202A the OTFS capability message based on a first OFDM waveform.

[0050] A UE local application (e.g., an extended reality (XR) application or a vehicular application) might trigger 210 the UE 102E to perform radar sensing and cause the UE 102E to transmit 214 an OTFS request message to the network entity 104. UE local application requirements for delay, Doppler, and / or latency resolution values may be based on specific use cases. For the vehicular application (e.g., autonomous vehicle application), for example, the maximum radar range resolution or the maximum radar Doppler resolution depends on the road conditions (e.g.. single lane or multi-lane, weather conditions, etc.) For the XR application, the gaming application determines the resolution requirements for radar sensing in the physical world.

[0051] The radar-requestor UE 102E transmits 214, to the network entity 104, an OTFS request message for requesting a radar resource grant to perform radar sensing with a radar-assistor. The radar request message may include at least one of: a maximum radar range resolution, a maximum radar Doppler resolution, or a latency requirement for the radar detection.

[0052] In some embodiments, the radar-requestor UE 102E transmits 214 the request message via a physical uplink control channel (PUCCH) or a physical uplink shared channel PUSCH. In some examples, the radar-requestor UE 102E transmits the request message together with the OTFS capability message. In some other embodiments, the OTFS capability message includes the fields of the request message. In other embodiments, the network entity 104 requests radar sensing and thus receipt, from a UE 102, of an OTFS radar request message is optional. In some aspects, the radar-requestor UE 102E transmits 214 the request message for the radar sensing assistance based on a second OFDM waveform.

[0053] In some embodiments, the receiving 202A / 214 the request message or the OTFS capability’ message might cause the network entity 104 to request other UEs to transmit other OTFS capability message(s) for the other UEs. In some other embodiments, the network entity 104 requests the other UEs to transmit the OTFS capability message(s) without any trigger. In still further embodiments, the other UEs transmit other OTFS capability message(s) without receiving a request from the network entity 104, such as shown in FIGs. 4A-4B.

[0054] The network entity 104 determines 218 radar resources for the requestor. For example, the network entity 104 determines 218 an OTFS resource grant that includes the 2-dimensional (2D) grid in the delay-Doppler domain. The OTFS resource grant may indicate the start and the end of delay grid. The OTFS resource grant may also indicate the start and the end of the Doppler grid. In some other examples, the OTFS resource grant includes a bitmap for the allocated delay grid and the allocated doppler grid. The OTFS resource grant may also include radar sequences used in the delay- Doppler domain. The OTFS resource grant may also include the time slot on which the UE is allowed to transmit the OTFS signal. This time slot includes an upper bound based on the latency requirement of the radar detection and a lower bound based on the minimum delay between a reception of a Tx grant and a time that the UE performs OTFS signal transmission. The OTFS resource grant may also indicate the transmit power of the OTFS signal.

[0055] After the network entity 104 determines 218 the OTFS resource grant, the network entity 104 transmits 222 A the OTFS radar Tx grant to the radar-requestor UE 102E. For example, the radar-requestor 102E receives 222 A a first resource grant from the network entity 104. The first resource grant is for propagation of the OTFS signal between a transmitter and a receiver. In some examples, the transmitter and the receiver are both located at the UE 102E (e.g., monostatic radar sensing). In other examples, a first sensor, such as the transmitter, is located at the UE 102E and a second sensor, such as the receiver, is located at the network entity 104 (e.g., bi-static radar sensing). The first resource grant might indicate radar Tx resources for a radar transmission 230. The radar-requestor 102E may receive, from the network entity 104 on a physical downlink control channel (PDCCH), downlink control information (DCI) that indicates the OTFS resource grant, as described above.

[0056] The radar-requestor 102E might receive 223, from the network entity 104, an uplink grant for a radar communication report. For example, the UE 102E receives 223, from the network entity’ 104, a PDCCH grant indicating uplink resources for a radar measurement report message associated with a measurement of the OTFS signal. The radar-requestor 102E receives 223, from the network entity 104, the uplink grant for the radar communication report when the UE 102E receives and its own radar reflection 234A. If the network entity 104 receives the reflection of the OTFS signal 233A instead, then the network entity 104 already has the informationthat the network entity 104 would otherwise receive in this radar communication report 242.

[0057] The OTFS radar grant and the uplink grant may be semi-persistent grants or dynamic grants indicating, respectively, radar resources for the OTFS signal and uplink resources for a radar measurement report message associated with the measurement of the OTFS signal. The semi-persistent OTFS radar grant may include delay / doppler grids (and sequences) that UE can use. The semi-persistent grant may also indicate a periodicity and an offset for the transmission. For example, the semi- persistent grant indicates the bitmap or the start and the end of the delay grid and doppler grid. The radar-requestor transmits the OTFS signal based on reception of the semi-persistent grant on the PDCCH.

[0058] In some examples, the radar-requestor 102E receives an activation of a semi- persistent grant via RRC signaling. In other examples, the radar-requestor 102E receives an activation of a semi-persistent grant via a medium access control-control element (MAC-CE).

[0059] Responsive to receiving 222A the first grant, the radar-requestor UE 102E transmits 230 the OTFS signal over-the-air for OTFS signal reception 233A / 234A. If the OTFS signal impinges the object 276, a direction and / or characteristics of the OTFS signal may change. For example, the OTFS signal ricochets off the object 276. The ricochet is sometimes referred to as a reflection / ricochet of the OTFS signal. In some aspects, the radar-requestor UE 102E receives 222 A the first resource grant based on a third OFDM waveform.

[0060] In some embodiments, the network entity 104 can act as a radar-assistor to assist the requestor UE 102E by receiving 233A the ricochet of the OTFS signal and performing the radar sensing (e.g., bi-static radar sensing). That is, the network entity 104 receives 233A the OTFS signal after being ricocheted off the object 276. Responsive to receiving 233A the OTFS signal / ricochet. the network entity 104 performs 238A radar reception processing to processes the OTFS signal. For example, the network entity' 104 processes the OTFS signal by determining radar signal propagation delay information and / or movement information. In some aspects, the network entity 104 determines a time delay of the reflection / ricochet of the OTFS signal. The time delay refers to a travel time of the OTFS signal, such as a first travel time from the UE transmitter to the network entity’ receiver reflected by the object 276, or a second travel time (e.g., round trip travel time) from the UE transmitter backto the UE receiver reflected by the object 276. The reflection / ricochet of the OTFS signal is a delayed replica of the OTFS signal. In some aspects, the network entity 104 determines angle information of the object 276 from the reflection / ricochet of the OTFS signal. In some aspects, the network entity 104 determines the speed (doppler shift) of the object 276 from the reflection / ricochet of the OTFS signal. By processing 238 A the OTFS signal, the network entity 104 can assist the UE 102E with detection of the object 276 by identifying 246 the object information.

[0061] In embodiments, the OTFS signal might include uplink information from the radar-requestor. The network entity 104 indicates an uplink power control adjustment to the UE to ensure the OTFS signal can accommodate the transmit power for the radar sensing and the uplink physical channels. For example, the network entity 104 increases the transmit power for the radar sensing, even if the transmission of data on the uplink physical channels does not otherwise require such an increase to the transmit power. In other examples, the network entity 104 performs a prioritization between the transmission of information on the uplink physical channels and the radar sensing.

[0062] The network entity 104 may jointly select the phase vectors for the radar signal detection and the communication. However, there may be a tradeoff between the beamforming for the radar signal detection and the communication. For example, the communication channels are improved by directing the energy towards the receiver, whereas the OTFS signal is improved by covering various angles. In addition, the OTFS signal may require narrower beams in certain applications in order to achieve a higher angular resolution, but the network entity 104 may use wider beams for both the communication and the radar sensing functionalities (e.g., at the expense of decreased beamforming gain for the communication and angular resolution for the radar signal).

[0063] The network entity 104 may use the information obtained from processing 246 the OTFS signal to identify 246 object information. In other examples, where the radar-requestor UE 102E receives 234A the ricochet of the OTFS signal from the object 276, the radar-requestor UE 102E performs 238B the radar reception processing to processes the OTFS signal and includes radar measurement information in the radar measurement report message that the radar-requestor UE 102E transmits 242 to the network entity.

[0064] Regardless of whether the network entity 104 or the UE 102E performs 238 the radar reception processing, the network entity 104 identifies 246 object information based on the processed radar information. The object information may indicate a presence or location of the object 276, a velocity of the object 276, a first distance between the transmitter and the object 276. a second distance between the receiver and the object 276, a third distance between the transmitter and the receiver, a direction of movement of the object 276, an elevation angle, a size of the object 276, and / or a surface composition of the object 276. In other examples, the network entity 104 identifies 246 object information that indicates the OTFS signal did not impinge an object 276 (i.e., non-detection of an object).

[0065] After the network entity 104 identifies 246 the object information, the network entity 104 optionally transmits 250 the obj ect information to the radar-requestor 102E. Generally, the object information should be conveyed to the radar-requestor. Thus, when the network entity 104 is the radar-requestor, the object identification 246 provides the object information to the radar-requestor. After the radar-requestor 102E receives the object information, the radar-requestor 102E, for example, can detect and track the object 276. FIG. 2 shows the radar-requestor UE 102E operating as the OTFS signal transmitter. FIG. 3 shows the network entity 104 operating as the OTFS signal transmitter.

[0066] FIG. 3 shows example scenario 300 for radar signal sensing with the network entity 104 as the transmitter. The example scenario 300 is similar to an implementation of FIG. 1C where the UEs 102 are communicating with the network entity 104. Elements 202A. 210, 214, 218. 238A, 238B. 242, 246, 250. and 276 of FIG. 3 have already been described with respect to FIG. 2.

[0067] Referring to FIG. 3, where the network entity 104 operates as a transmitter, the network entity 104 transmits 222B a first resource grant for propagation of the OTFS signal between a transmitter and a receiver. While FIG. 3 shows the transmitter being at the network entity 104, the receiver may be at the network entity 104 or the UE 102E. The network entity 104 also transmits 222B a communication grant for a radar measurement report message associated with a measurement of the OTFS signal. The network entity 104 may transmit the first grant for the OTFS signal and the second grant for communication of the radar measurement report message in the same or different signaling. The first resource grant might indicate, to the UE 102E, radar receive (Rx) resources for a radar reception of the signal transmitted by the networkentity 104. In some aspects, the network entity 104 transmits 222B the communication grant based on a fourth OFDM waveform.

[0068] After transmitting 222B the OTFS resource grant and the uplink communication grant, the network entity 104 transmits 332 the OTFS signal over-the-air for OTFS signal reception 234B / 233B. If the network entity 104 receives 233B the reflection of the radar signal from the object 276, the network entity' performs 238 A radar reception processing and identifies 246 the object information, as described above with respect to FIG. 2. If the UE 102E receives 234B the reflection / ricochet of the radar signal from the object 276 (e.g.. based on the radar Rx resources indicated in the grant), the UE 102E performs 238B the radar reception processing and includes the radar measurement information in the radar measurement report message, as described above with respect to FIG. 2. FIGs. 2-3 show propagation of the radar signal between the radar-requestor UE 102E and the network entity 104. FIGs. 4A- 4B show propagation of the radar signal to a second UE 102F that is not the radarrequestor UE 102E.

[0069] FIG. 4A describes another example scenario 400 in which a radar-assistor UE 102F operates as a receiver and the network entity 104 operates as a transmitter for radar sensing, such as shown in an implementation of FIG. 1C. Elements 202A, 210. 214, 218, 332, 234B, 242, 246, 250, and 276 of FIG. 4A have already been described with respect to FIGs. 2-3.

[0070] Referring to FIG. 4 A, where the UE 102F operates as a radar-assistor, the UE 102F might transmit 202B, to the network entity 104, an OTFS capability message that indicates OTFS capabilities supported by the UE 102F for the radar sensing with OTFS signal. The capabilities may be similar to the capabilities described above with respect to 202A in FIG.2. The OTFS capability message 202B may also indicate a capability of the UE 102F to operate as a radar-assistor UE. In some aspects, the radar-assistor UE 102F transmits 202B the OTFS capability message based on a first OFDM waveform.

[0071] The radar-requestor 102E transmits 214, to the network entity 104, an OTFS request message for requesting assistance with object detection. This request message may identify a radar-assistor UE 102F such as a device commonly owned with the radar-requestor 102E (e.g., smart phone, smart glasses, smart watch, or smart vehicle in a personal area network of a user). The radar-assistor might not be specified by the radar-requestor 102E in the request message. Hence, the network entity 104 selects aradar measurement assistor to assist the radar-requestor 102E with the object detection. For example, if the UE 102E transmits 214 the radar request message to the network entity 104, the network entity 104 can select the radar-assistor to be another UE 102F in response to receiving 214 the request message. In other examples, the network entity 104 selects the UE 102F to be a radar-assistor without receiving an explicit request from the UE 102E for a radar-assistor.

[0072] The radar-assistor 102F assists with the object detection based on bi-static radar sensing between the netw ork entity 104 and the radar-assistor UE 102F. The netw ork entity 104 may select the radar-assistor 102F based on the radar-assistor capability satisfying the radar sensing requirements indicated by the radar-requestor 102E (e.g., radar signal bandwidth, etc.). The network entity 104 selects the radar-assistor 102F based on the radar-assistor capability to process the OTFS signal. The network entity- 104 may also select the radar-assistor based on location information of the radar- assistor 102F. For example, the network entity 104 refers to the location information of the UE 102E included in the radar request message (e.g., the position of the UE 102E and / or an orientation of the UE 102E) to select the radar-assistor 102F that is the closest to the radar-requestor 102E. The network entity 104 may further select the radar-assistor based on Doppler information. For example, the network entity 104 refers to the Doppler information for the UE 102E included in the radar request message (e.g., the frequency offset of the UE 102E) to select the radar-assistor 102F that has a low- mobility.

[0073] The network entity 104 transmits 222C, to the radar-assistor UE 102F, a first resource grant for propagation of the OTFS signal between the network entity 104 and the radar-assistor UE 102F. The first resource grant indicates OTFS radar Rx resources for a radar reception at the radar-assistor UE 102F. The first resource grant includes an uplink communication grant for a radar measurement report message associated with a measurement of the OTFS signal.

[0074] The network entity 104 transmits 332 the OTFS signal responsive to receiving 214 the request from the UE 102E. After receiving 234B the OTFS signal / ricochet from the object 276, the receiver UE 102F performs 438 radar reception processing of the OTFS signal. The radar-assistor UE 102F includes measurement information for the OTFS signal in a radar measurement report message transmitted 242 to the network entity 104, in a similar manner to the radar measurement report message transmitted by the UE 102E described above with respect to FIG. 2. FIG. 4A show spropagation of the radar signal between the network entity 104 and the radar-assistor UE 102F. FIG. 4B shows propagation of the radar signal between the radar-requestor UE 102E and the radar-assistor UE 102F.

[0075] FIG. 4B describes another example scenario 460 in which the radar-assistor UE 102F operates as a receiver and the radar-requestor UE 102E operates as a transmitter for radar sensing, such as shown in an implementation of FIG. IB. Elements 202A, 202B, 210, 214, 218, 222A, 230, 234A, 246, 250, 276, and 438 of FIG. 4B have already been described above with respect to FIGs. 2-4A.

[0076] In previous examples, the UE 102E transmitted the OTFS request message to the network entity 104. However, as shown in FIG. 4B, the network entity 104 might alternatively transmit 214 the OTFS request message to the UE 102E. For example, the OTFS request message indicates that the UE 102E is to perform radar sensing assistance with the second UE 102F.

[0077] The UE 102E transmits 222D. to the UE 102F. a sidelink communication grant for a radar measurement report message. In some aspects, the UE 102E transmits the sidelink 222D communication grant based on a fifth OFDM waveform. Then, the UE 102E transmits 230 the OTFS radar signal. The UE 102F receives 234A the ricochet of the OTFS radar signal from the obj ect 276 and processes 438 the radar information.

[0078] After the UE 102F performs 438 the radar processing, the UE 102F transmits 442D the radar measurement report message including the processed radar measurement information. The UE 102F may transmit 442D the radar measurement report message directly to the network entity 104 via an access link or to the UE 102E using the sidelink communication grant. If the UE 102E receives the radar measurement report message, the UE 102E relays, to the network entity 104, the radar measurement report message via an access link. In this manner, the network entity' 104 might identify 246 the object information and optionally transmit 250 the object information to UE 102E. Optionally, the UE 102E might identify 246 the object information.

[0079] FIGs. 5-6 show methods for implementing one or more aspects of FIGs. 2-4B. In particular, FIG. 5 shows an implementation by the UE 102 of the one or more aspects of FIGs. 2-4B. FIG. 6 shows an implementation by the network entity’ 104 of the one or more aspects of FIGs. 2-4B.

[0080] FIG. 5 illustrates a flowchart 500 of a method of wireless communication at a UE. With reference to FIGs. 1A-4B, the method may be performed by the UE 102. Inembodiments, the UE 102 might transmit 502A. to the network entity 104, a UE capability message indicating a capability of the UE for the performing the radar signaling procedure using the OTFS signal. Referring to FIGs. 2-4B, for example, the UE 102E or UE 102F transmits 202A or 202B an OTFS capability message that indicates OTFS capabilities supported by the radar-requestor for the radar sensing with OTFS signal.

[0081] The UE 102 might transmit 514, to the network entity 104, an OTFS request message for the radar sensing assistance. For example, referring to FIGs. 2-4B, UE 102E transmits 214, to the network entity 104. an OTFS request message.

[0082] The UE 102 receives 522, from a network entity 104, a first resource grant. The first resource grant is for propagation of OTFS signal between a transmitter and a receiver. In some aspects, the first resource grant includes a Tx grant 522A. In an example where the radar sensing procedure includes a receiver UE 102F, the UE 102E transmits 522D, to the receiver 102F, a sidehnk communication grant for a radar measurement report message associated with the OTFS signal. Referring to FIG. 4B, for example, the UE 102E transmits 222D, to the UE 102F, a sidelink communication grant for a radar measurement report message.

[0083] After the UE 102E receives the first resource grant, the UE 102E performs 531 according to the first resource grant, a radar signaling procedure based on the propagation of the OTFS signal between the transmitter and the receiver. In another example when the network entity 104 or the UE 102E acting as receiver, the UE 102E transmits 530 the OTFS signal according to the Tx grant. Referring to FIG. 2. for example, the UE 102E transmits 230 the OTFS signal 174 for radar sensing.

[0084] In some other aspects, the first resource grant includes a Rx grant 522B. In this example, the UE 102E further receives 522B a communication grant for a radar measurement report message associated with the OTFS signal. Referring to FIG. 3, for example, if the network entity 104 operates as a transmitter, the UE 102E also receives 222B a communication grant for a radar measurement report message. In some aspects, the UE 102E receives 222B, 222C, 222D the communication grant based on a fourth OFDM waveform.

[0085] In another example where UE 102E or the network entity 104 acting as a transmitter, the UE 102E receives 534A / B the OTFS signal according to the Rx grant. Referring to FIGs. 2-3, for example, the UE 102E receives 234A / 234B the OTFS signal after being ricocheted off the object 276.

[0086] In embodiments, the UE 102E might transmit 542, to the network entity 104. according to the communication grant, the radar measurement report message after the receiving the OTFS signal. Referring to FIGs. 2-3, the UE 102E transmits 242, to the network entity 104, the radar measurement report message. In some aspects, the UE 102E transmits 242 the radar measurement report message according to an uplink grant 223 based on a sixth OFDM waveform.

[0087] After the network entity 104 identifies the object information, the UE 102E might receive 550, from the network entity 104, the object information associated with the OTFS signal based on the performing the radar signaling procedure according to the first resource grant. Referring to FIGs. 2-3, the UE 102E receives 250, from the network entity 104, the object information. In some aspects, the UE 102E receives 250 the object information based on a seventh OFDM waveform.

[0088] For example, referring to FIGs. 2 and 4B, UE1 receives 222A, 222B, from the network entity 104, a first resource grant. In another example, referring to FIG. 4A. UE2 receives 222C, from the network entity 104, a first resource grant.

[0089] The UE performs 530, according to the first resource grant, a radar signaling procedure based on the propagation of the OTFS signal between the transmitter and the receiver. For example, referring to FIGs. 2 and 4B, UE1 transmits 230 the OTFS signal 174 for radar sensing. For example, referring to FIGs. 2 and 3, UE1 receives 234A, 234B the OTFS signal 174 for radar sensing. For example, referring to FIGs. 4A and 4B, UE2 receives 234A, 234B the OTFS signal 174 for radar sensing.

[0090] FIG. 5 describes a method from a UE 102E-side for radar sensing, whereas FIG. 6 describes a method from a UE 102F-side that can act as a radar-assistor for radar sensing.

[0091] FIG. 6 is a flowchart 600 depicting an example method, implemented at a radar- assistor (e.g., UE 102F), of performing radar sensing. With references to FIGs. 1A- 4B. the method may be performed by the UE 102. In embodiments, the UE 102F might transmit 602B, to the network entity 104, a UE capability message indicating a capability7of the UE for the performing the radar signaling procedure using the OTFS signal. Referring to FIGs. 4A-4B, for example, the UE 102F transmits 202B to the network entity 104 a radar capability message (e.g., UECapabilitylnformation message) that indicates UE radar capabilities. The radar capability message includes various fields as similarly described above with respect to FIGs. 2-3.

[0092] The radar-assistor receives 622, from the network entity 104. a first resource grant, the first resource grant being for propagation of the OTFS signal between a transmitter and a receiver.

[0093] In some aspects, when the network entity 104 controls the radar-assistor and the radar-assistor communicates with the network entity 104 via access links 179A / 179B. the first resource grant includes Rx grant. In this example, the radar-assistor optionally receives 622C a communication grant for a radar measurement report message associated with the OTFS signal. Referring to FIG. 4A, for example, the radar-assistor (e.g., UE 102F) receives 222C, from the network entity 104, a first resource grant including Rx grant and optionally an UL grant for radar measurement report.

[0094] In some other aspects, when the UE 102E controls the radar-assistor and the radar- assistor does not have wireless connection to the network entity 104, the radar-assistor receives 622D. from the UE 102E, a sidelink communication grant for a radar measurement report message associated with the OTFS signal. Referring to FIG. 4B, for example, the UE 102F receives 222D, from the UE 102E, a sidelink communication grant for a radar measurement report message.

[0095] In embodiments, the radar-assistor performs 634, according to the first resource grant, a radar signaling procedure. In some examples, the radar-assistor receives 634A / B the OTFS signal according to the Rx grant. Referring to FIG. 4A, the radar- assistor receives 234B over-the-air the OTFS signal. In some other examples, the radar-assistor receives 634A / B the OTFS signal according to the sidelink communication grant. Referring to FIG. 4B, the radar-assistor receives 234A the OTFS signal via the sidelink communication grant.

[0096] In embodiments, the radar-assistor transmits 642, according to the communication grant, the radar measurement report. Referring to FIGs. 4A-4B, the radar-assistor transmits 242 / 442D, to the network entity 104, the radar measurement report message. FIG.6 describes a method from a radar-assistor-side for radar sensing, whereas FIG. 7 describes a method from a network entity-side for radar sensing.

[0097] FIG. 7 is a flowchart 700 of a method of wireless communication at a network entity. With reference to FIGs. 1 A-4B, the method may be performed by one or more network entities 104, which may correspond to a base station or a unit of the base station, such as the RU 106, the DU 108, and / or the CU 110. In embodiments, the network entity 104 might receive 702 A / B, from the UE (e.g., 102E, 102F), a UEcapability message indicating a capability of the UE for the radar sensing assistance using the OTFS signal. Referring to FIGs. 2-4B, for example, the network entity 104, receives 202A or 202B, from the UE 102E or UE 102F, an OTFS capability message that indicates OTFS capabilities supported by the radar-requestor for the radar sensing with OTFS signal. In some aspects, the network entity 104 receives 202A. 202B the UE capability' message based on a first OFDM waveform.

[0098] After receiving the UE capability' message, the network entity might receive 714, from the UE 102E, an OTFS request message for the radar sensing assistance. Referring to FIGs. 2-4B. for example, the network entity 104 receives, from the UE 102E, an OTFS request message. In some examples, the network entity 104 might transmit an OTFS request message for the radar sensing assistance.

[0099] The network entity 104, transmits 722, to the UE, a first resource grant, the first resource grant being for propagation of the OTFS signal between a transmitter and a receiver.

[0100] In some aspects, in addition to transmitting an Rx grant in the first resource grant, the network entity 104 also transmits 722B / C, to the UE 102E, an uplink communication grant for the radar measurement report message associated with the OTFS signal. Referring to FIG. 3. for example, if the network entity 104 operates as a transmitter, the network entity 104 transmits 222B a first resource grant for propagation of the OTFS signal and a communication grant for a radar measurement report message associated with the OTFS signal. In some aspects, the network entity- 104 transmits 222 the first resource grant based on a third OFDM waveform.

[0101] In embodiments, if the network entity 104 operates as a transmitter, the network entity 104 might transmit 732 the OTFS signal to the receiver. Referring to FIGs. 3 and 4A, for example, the network entity 104 transmits 332 the OTFS signal over-the- air for OTFS signal reception.

[0102] In embodiments, if the network entity 104 operates as a receiver, the network entity 104 might receive 733A / B the OTFS signal from the transmitter. Referring to FIGs. 2 and 3, for example, the network entity 104 receives 233A / 233B the OTFS signal after being ricocheted off the object 276.

[0103] In embodiments, the network entity 104 receives 742. from the UE, the radar measurement report message based on the uplink communication grant. Referring to FIGs. 2-4B, for example, the network entity' 104 receives 242 / 442D, from either the UE 102E or the UE 102F, the radar measurement report message. In some aspects,the network entity 104 receives the radar measurement report according to an uplink grant based on a fifth OFDM waveform.

[0104] The network entity might transmit 750, to the radar-requestor (e.g., UE 102E), object information obtained in response to the receiving the radar measurement report. FIGs. 2-4B, for example, the network entity 104 transmit 250. to the UE 102E, object information obtained in response to the receiving the radar measurement report. In some aspects, the network entity 104 transmits 250 the object information based on a sixth OFDM waveform.

[0105] A UE apparatus 802, as described in FIG. 8, may perform the method of flowcharts 500 and 600. The one or more network entities 104, as described in FIG. 9, may perform the method of flowchart 700.

[0106] FIG. 8 is a diagram 800 illustrating an example of a hardware implementation for a UE apparatus 802. The UE apparatus 802 may be the UE 102, a component of the UE 102, or may implement UE functionality. The UE apparatus 802 may include an application processor 806, which may have on-chip memory 806’. In examples, the application processor 806 may be coupled to a secure digital (SD) card 808 and / or a display 810. The application processor 806 may also be coupled to a sensor(s) module 812, a power supply 814. an additional module of memon 816, a camera 818, and / or other related components. For example, the sensor(s) module 812 may control a barometric pressure sensor / altimeter, a motion sensor such as an inertial management unit (IMU), a gyroscope, accelerometer(s), a light detection and ranging (LIDAR) device, a radio-assisted detection and ranging (RADAR) device, a sound navigation and ranging (SONAR) device, a magnetometer, an audio device, and / or other technologies used for positioning.

[0107] The UE apparatus 802 may further include a wireless baseband processor 826, which may be referred to as a modem. The wireless baseband processor 826 may have on-chip memory 826'. Along with, and similar to, the application processor 806. the wireless baseband processor 826 may also be coupled to the sensor(s) module 812, the power supply 814, the additional module of memory 816, the camera 818, and / or other related components. The wireless baseband processor 826 may be additionally coupled to one or more subscriber identity module (SIM) card(s) 820 and / or one or more transceivers 830 (e.g., wireless RF transceivers).

[0108] Within the one or more transceivers 830, the UE apparatus 802 may include a Bluetooth module 832, a WLAN module 834, an SPS module 836 (e.g., GNSSmodule), and / or a cellular module 838. The Bluetooth module 832, the WLAN module 834, the SPS module 836, and the cellular module 838 may each include an on-chip transceiver (TRX), or in some cases, just a transmitter (TX) or just a receiver (RX). The Bluetooth module 832, the WLAN module 834, the SPS module 836, and the cellular module 838 may each include dedicated antennas and / or utilize antennas 840 for communication with one or more other nodes. F or example, the UE apparatus 802 can communicate through the transceiver(s) 830 via the antennas 840 with another UE (e.g., sidelink communication) and / or with a network entity 104 (e.g., uplink / downlink communication), where the network entity 104 may correspond to a base station or a unit of the base station, such as the RU 106, the DU 108, or the CU 110.

[0109] The wireless baseband processor 826 and the application processor 806 may each include a computer-readable medium / memory 826', 806', respectively. The additional module of memory 816 may also be considered a computer-readable medium / memory. Each computer-readable medium / memory 826', 806', 816 may be non-transitory. The wireless baseband processor 826 and the application processor 806 may each be responsible for general processing, including execution of software stored on the computer-readable medium / memory' 826', 806', 816. The software, when executed by the wireless baseband processor 826 I application processor 806, causes the wireless baseband processor 826 / application processor 806 to perform the various functions described herein. The computer-readable medium / memory' may also be used for storing data that is manipulated by the wireless baseband processor 826 / application processor 806 when executing the software. The wireless baseband processor 826 / application processor 806 may be a component of the UE 102. The UE apparatus 802 may be a processor chip (e.g., modem and / or application) and include just the wireless baseband processor 826 and / or the application processor 806. In other examples, the UE apparatus 802 may be the entire UE 102 and include the additional modules of the apparatus 802.

[0110] As discussed in FIG. 1 A and implemented with respect to FIG. 5, the OTFS radar component 140e / 140f is configured to receive, from the network entity, a first resource grant, the first resource grant being for propagation of an OTFS signal between a transmitter and a receiver; and perform, according to the first resource grant, a radar signaling procedure based on the propagation of the OTFS signal between the transmitter and the receiver.

[0111] The OTFS radar component 140e / 140f may be within the application processor 806 (e g., at 140a), the wireless baseband processor 826 (e.g., at 140b), or both the application processor 806 and the wireless baseband processor 826. The OTFS radar component 140a- 140b may be one or more hardware components specifically configured to carry out the stated processes / algorithm, implemented by one or more processors configured to perform the stated processes / algorithm, stored within a computer-readable medium for implementation by the one or more processors, or a combination thereof.

[0112] FIG. 9 is a diagram 900 illustrating an example of a hardw are implementation for one or more network entities 104. The one or more network entities 104 may be a base station, a component of a base station, or may implement base station functionality7. The one or more network entities 104 may include, or may correspond to, at least one of the RU 106, the DU, 108, or the CU 110. The CU 110 may include a CU processor 946, which may have on-chip memory 946'. In some aspects, the CU 110 may further include an additional module of memory 956 and / or a communications interface 948, both of which may be coupled to the CU processor 946. The CU 110 can communicate with the DU 108 through a midhaul link 162, such as an Fl interface between the communications interface 948 of the CU 110 and a communications interface 928 of the DU 108.

[0113] The DU 108 may include a DU processor 926, which may have on-chip memory 926'. In some aspects, the DU 108 may further include an additional module of memory 936 and / or the communications interface 928, both of which may be coupled to the DU processor 926. The DU 108 can communicate with the RU 106 through a fronthaul link 160 between the communications interface 928 of the DU 108 and a communications interface 908 of the RU 106.

[0114] The RU 106 may include an RU processor 906, which may have on-chip memory 906'. In some aspects, the RU 106 may further include an additional module of memory 916, the communications interface 908, and one or more transceivers 930, all of which may be coupled to the RU processor 906. The RU 106 may further include antennas 940, which may be coupled to the one or more transceivers 930, such that the RU 106 can communicate through the one or more transceivers 930 via the antennas 940 with the UE 102.

[0115] The on-chip memory 906', 926', 946' and the additional modules of memory 916, 936, 956 may each be considered a computer-readable medium / memory. Eachcomputer-readable medium / memory may be non-transitory. Each of the processors 906, 926, 946 is responsible for general processing, including execution of software stored on the computer-readable medium / memory. The software, when executed by the corresponding processor(s) 906, 926, 946 causes the processor(s) 906, 926, 946 to perform the various functions described herein. The computer-readable medium / memory may also be used for storing data that is manipulated by the processor(s) 906, 926, 946 when executing the software. In examples, the radar assistance component 150 may sit at any of the one or more network entities 104, such as at the CU 110; both the CU 110 and the DU 108; each of the CU 110, the DU 108. and the RU 106; the DU 108; both the DU 108 and the RU 106; or the RU 106.

[0116] As discussed in FIG. 1A and implemented with respect to FIG. 7, the radar assistance component 150 is configured to transmit, to a UE, a first resource grant, the first resource grant being for propagation of an OTFS signal between a transmitter and a receiver; receive, from the UE. a radar measurement report message associated with the propagation of the OTFS signal between the transmitter and the receiver; and transmit, to the UE, object information obtained in response to the receiving the radar measurement report.

[0117] The radar assistance component 150 may be within one or more processors of the one or more network entities 104, such as the RU processor 906 (e.g., at 150a), the DU processor 926 (e.g., at 150b), and / or the CU processor 946 (e.g., at 150c). The radar assistance component 150a-150c may be one or more hardware components specifically configured to carry out the stated processes / algorithm. implemented by one or more processors 906, 926, 946 configured to perform the stated processes / algorithm, stored within a computer-readable medium for implementation by the one or more processors 906, 926, 946, or a combination thereof.

[0118] The specific order or hierarchy of blocks in the processes and flowcharts disclosed herein is an illustration of example approaches. Hence, the specific order or hierarchy of blocks in the processes and flowcharts may be rearranged. Some blocks may also be combined or deleted. Dashed lines may indicate optional elements of the diagrams. The accompanying method claims present elements of the various blocks in an example order, and are not limited to the specific order or hierarchy presented in the claims, processes, and flowcharts.

[0119] The detailed description set forth herein describes various configurations in connection with the drawings and does not represent the only configurations in whichthe concepts described herein may be practiced. The detailed description includes specific details for the purpose of providing a thorough explanation of various concepts. However, these concepts may be practiced without these specific details. In some instances, well known structures and components are shown in block diagram form in order to avoid obscuring such concepts.

[0120] Aspects of wireless communication systems, such as telecommunication systems, are presented with reference to various apparatuses and methods. These apparatuses and methods are described in the following detailed description and are illustrated in the accompanying drawings by various blocks, components, circuits, processes, call flows, systems, algorithms, etc. (collectively referred to as '‘elements”). These elements may be implemented using electronic hardware, computer 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.

[0121] An element, or any portion of an element, or any combination of elements may be implemented as a “processing system” that includes one or more processors. Examples of processors include microprocessors, microcontrollers, graphics processing units (GPUs), central processing units (CPUs), application processors, digital signal processors (DSPs), reduced instruction set computing (RISC) processors, systems-on-chip (SoC), baseband processors, field programmable gate arrays (FPGAs), programmable logic devices (PLDs), state machines, gated logic, discrete hardware circuits, and other similar hardware configured to perform the various functionality described throughout this disclosure. One or more processors in the processing system may execute software, which may be referred to as software, firmware, middleware, microcode, hardware description language, or otherwise. Software shall be construed broadly to mean instructions, instruction sets, code, code segments, program code, programs, subprograms, software components, applications, software applications, software packages, routines, subroutines, objects, executables, threads of execution, procedures, functions, or any combination thereof.

[0122] If the functionality described herein is implemented in software, the functions may be stored on, or encoded as, one or more instructions or code on a computer-readable medium, such as a non-transitory computer-readable storage medium. Computer- readable media includes computer storage media and can include a random-access memory (RAM), a read-only memory7(ROM), an electrically erasable programmableROM (EEPROM), optical disk storage, magnetic disk storage, other magnetic storage devices, combinations of these types of computer-readable media, or any other medium that can be used to store computer executable code in the form of instructions or data structures that can be accessed by a computer. Storage media may be any available media that can be accessed by a computer.

[0123] Aspects, implementations, and / or use cases described herein may be implemented across many differing platform types, devices, systems, shapes, sizes, and packaging arrangements. For example, the aspects, implementations, and / or use cases may come about via integrated chip implementations and other non-module-component based devices, such as end-user devices, vehicles, communication devices, computing devices, industrial equipment, retail / purchasing devices, medical devices, artificial intelligence (Al)-enabled devices, machine learning (ML)-enabled devices, etc. The aspects, implementations, and / or use cases may range from chip-level or modular components to non-modular or non-chip-level implementations, and further to aggregate, distributed, or original equipment manufacturer (OEM) devices or systems incorporating one or more techniques described herein.

[0124] Devices incorporating the aspects and features described herein may also include additional components and features for the implementation and practice of the claimed and described aspects and features. For example, transmission and reception of wireless signals necessarily includes a number of components for analog and digital purposes, such as hardware components, antennas, RF-chains, power amplifiers, modulators, buffers, processor(s). interleavers, adders / summers, etc. Techniques described herein may be practiced in a wide variety of devices, chip-level components, systems, distributed arrangements, aggregated or disaggregated components, end-user devices, etc., of varying configurations.

[0125] The description herein is provided to enable a person skilled in the art to practice the various aspects described herein. Various modifications to these aspects will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other aspects. Thus, the claims are not limited to the aspects described herein, but are to be interpreted in view of the full scope of the present disclosure consistent with the language of the claims.

[0126] Reference to an element in the singular does not mean “one and only one” unless specifically stated, but rather “one or more.” Terms such as “if,” “when,” and “while” do not imply an immediate temporal relationship or reaction. That is, these phrases,e.g., “when,” do not imply an immediate action in response to or during the occurrence of an action, but simply imply that if a condition is met then an action will occur, but without requiring a specific or immediate time constraint for the action to occur. The terms “may”, “might”, and “can”, as used in this disclosure, often carry certain connotations. For example, “may” refers to a permissible feature that may or may not occur, “might” refers to a feature that probably occurs, and “can” refers to a capability (e.g., capable of). The phrase “For example” often carries a similar connotation to “may” and, therefore, “may” is sometimes excluded from sentences that include “for example” or other similar phrases.

[0127] Unless specifically stated otherwise, the term “some” refers to one or more. Combinations such as “at least one of A, B, or C” or “one or more of A, B, or C” include any combination of A, B, and / or C, such as A and B, A and C, B and C, or A and B and C, and may include multiples of A, multiples of B. and / or multiples of C, or may include A only. B only, or C only. Sets should be interpreted as a set of elements where the elements number one or more. Terms or articles such as “a”, “an”, and / or “the” may refer to one of an item, feature, element, etc., that the term or article precedes, or may refer to more than one of said item, feature, element, etc. that the term or article precedes. For example, the recitation “a widget” does not preclude reference to multiples of said widget, as “multiple widgets” necessarily includes “a widget”. Hence, the recitation “a widget” may be interpreted as “at least one widget” or, similarly, interpreted as “one or more widgets”.

[0128] Unless otherwise specifically indicated, ordinal terms such as “first” and “second” do not necessarily imply an order in time, sequence, numerical value, etc., but are used to distinguish between different instances of a term or phrase that follows each ordinal term.

[0129] Reference numbers, as used in the specification and figures, are sometimes cross- referenced among drawings to denote same or similar features. A feature that is exactly the same in multiple drawings may be labeled with the same reference number in the multiple drawings. A feature that is similar among the multiple drawings, but not exactly the same, may be labeled with reference numbers that have different leading numbers but have one or more of the same trailing numbers (e.g., 206, 306. 406, etc., may refer to similar features in the drawings). Hence, like numbers may refer to like actions.

[0130] Structural and functional equivalents to elements of the various aspects described throughout this disclosure that are known or later come to be known to those of ordinary skill in the art are expressly incorporated herein by reference and are encompassed by the claims. The words “module,” “mechanism.” “element,” “device,” and the like may not be a substitute for the word “means.” As such, no claim element is to be construed as a means plus function unless the element is expressly recited using the phrase “means for.” As used herein, the phrase “based on” shall not be construed as a reference to a closed set of information, one or more conditions, one or more factors, or the like. In other words, the phrase “based on A”, where “A” may be information, a condition, a factor, or the like, shall be construed as “based at least on A” unless specifically recited differently.

[0131] The following examples are illustrative only and may be combined with other examples or teachings described herein, without limitation.

[0132] Example 1 is a method of radar sensing assistance at a UE. including: receiving, from a network entity, a first resource grant, the first resource grant being for propagation of an orthogonal time-frequency space, OTFS, signal between a transmitter and a receiver; and performing, according to the first resource grant, a radar signaling procedure based on the propagation of the OTFS signal between the transmitter and the receiver.

[0133] Example 2 may be combined with example 1 and further includes transmitting, to the netw ork entity', an OTFS request message for the radar sensing assistance, the first resource grant being responsive to the OTFS request message.

[0134] Example 3 may be combined with any of examples 1-2 and further includes that the first resource grant is a receive (Rx) grant for the OTFS signal, and further includes that the performing the radar signaling procedure includes: receiving the OTFS signal according to the Rx grant.

[0135] Example 4 may be combined with any of examples 1-2 and further includes that the first resource grant is a transmit (Tx) grant for the OTFS signal, and further includes that the performing the radar signaling procedure includes: transmitting the OTFS signal according to the Tx grant.

[0136] Example 5 may be combined with any of examples 1-4 and further includes: receiving a communication grant for a radar measurement report message associated with the OTFS signal; and transmitting, according to the communication grant, the radar measurement report message after the receiving the OTFS signal.

[0137] Example 6 may be combined with any of examples 1-2 or 4 and further includes: transmitting, to the receiver, a sidelink communication grant for a radar measurement report message associated with the OTFS signal; and receiving, according to the sidelink communication grant, the radar measurement report message after the transmitting the OTFS signal.

[0138] Example 7 may be combined with any of examples 1-6 and further includes receiving an object information associated with the OTFS signal based on the performing the radar signaling procedure according to the first resource grant.

[0139] Example 8 may be combined with any of examples 1-7 and further includes transmitting, to the network entity, a UE capability message indicating a capability of the UE for the performing the radar signaling procedure using the OTFS signal.

[0140] Example 9 may be combined with example 8 and further includes that the OTFS signal includes communication information forming a combined radar and communication signal.

[0141] Example 10 may be combined with any of examples 1-9 and further includes that the transmitting of the UE capability message is based on a first orthogonal frequency division multiplexing (OFDM).

[0142] Example 11 may be combined with any of examples 1-10, the transmitting of the OTFS request message for the radar sensing assistance is based on a second OFDM waveform.

[0143] Example 12 may be combined with any of examples 1-11, wherein the receiving of the first resource grant is based on a third OFDM waveform.

[0144] Example 13 may be combined with any of examples 1-12, wherein the receiving of the communication grant is based on a fourth OFDM waveform.

[0145] Example 14 may be combined with any of examples 1-13, wherein the transmitting of the sidelink communication grant is based on a fifth OFDM waveform.

[0146] Example 15 may be combined with any of examples 1-14, the transmitting of the radar measurement report message according to an uplink grant is based on a sixth OFDM waveform.

[0147] Example 16 may be combined with any of examples 1-15, wherein the receiving (250) of the object information is based on a seventh OFDM waveform.

[0148] Example 17 is a method of radar sensing assistance at a network entity, including: transmitting, to a user equipment, UE, a first resource grant, the first resource grant being for propagation of an orthogonal time-frequency space, OTFS, signal betweena transmiter and a receiver; and receiving, from the UE, a radar measurement report message associated with the propagation of the OTFS signal between the transmiter and the receiver.

[0149] Example 18 may be combined with Example 17 and further includes transmiting, to the UE, object information obtained in response to the receiving the radar measurement report.

[0150] Example 19 may be combined with example 17 and further includes receiving, from the UE, an OTFS request message for the radar sensing assistance, the first resource grant being responsive to the OTFS request message.

[0151] Example 20 may be combined with any of examples 17-18 and further includes that the network entity is the transmiter, further including: transmiting the OTFS signal from the transmitter to the receiver.

[0152] Example 21 may be combined with any of examples 17-20 and further includes that the network entity is the receiver, further including: receiving the OTFS signal from the transmiter.

[0153] Example 22 may be combined with any of examples 17-21 and further includes that the first resource grant is a receive (Rx) grant for the OTFS signal propagated between the transmiter and the receiver.

[0154] Example 23 may be combined with any of examples 17-22 and further includes that the first resource grant is a transmit (Tx) grant for the OTFS signal propagated between the transmiter and the receiver.

[0155] Example 24 may be combined with any of examples 17-23and further includes: transmiting, to the UE, an uplink communication grant for the radar measurement report message associated with the OTFS signal; and receiving, from the UE, the radar measurement report message based on the uplink communication grant.

[0156] Example 25 may be combined with any of examples 17-24 and further includes receiving, from the UE, a UE capability message indicating a capability of the UE for the radar sensing assistance using the OTFS signal.

[0157] Example 26 may be combined with any of examples 17-25, wherein the receiving of the UE capability message is based on a first orthogonal frequency division multiplexing (OFDM) waveform.

[0158] Example 27 may be combined with any of examples 17-26, the receiving of the OTFS request message for the radar sensing assistance is based on a second OFDM waveform.

[0159] Example 28 may be combined with any of examples 17-27, wherein the transmitting of the first resource grant is based on a third OFDM waveform.

[0160] Example 29 may be combined with any of examples 17-28, wherein the transmitting of the communication grant is based on a fourth OFDM waveform.

[0161] Example 30 may be combined with any of examples 17-29, the receiving of the radar measurement report message according to an uplink grant is based on a fifth OFDM waveform.

[0162] Example 31 may be combined with any of examples 17-30, wherein the transmitting of the object information is based on a sixth OFDM waveform.

[0163] Example 32 is an apparatus for wireless communication for implementing a method as in any of examples 1-31.

[0164] Example 33 is an apparatus for wireless communication including means for implementing a method as in any of examples 1-31.

[0165] Example 34 is a non-transitory computer-readable medium storing computer executable code, the code when executed by a processor causes the processor to implement a method as in any of examples 1-31.

Claims

CLAIMSWHAT IS CLAIMED IS:

1. A method of radar sensing assistance at a user equipment. UE, (102E / 102F). comprising: receiving (222), from a network entity (104), a first resource grant, the first resource grant being for propagation of an orthogonal time-frequency space. OTFS, signal between a transmitter (102E, 104) and a receiver (102E, 102F, 104), the first resource grant indicating OTFS resources in a delay-doppler domain for a transmission of the OTFS signal; and performing (230, 234), according to the first resource grant, a radar signaling procedure based on the propagation of the OTFS signal between the transmitter (102E, 104) and the receiver (102E, 102F, 104).

2. The method of claim 1, further comprising: transmitting (214), to the network entity (104), an OTFS request message for the radar sensing assistance, the first resource grant being responsive to the OTFS request message.

3. The method of any of claims 1 -2. wherein the first resource grant is a receive (Rx) grant (222B, 222C) for the OTFS signal, and wherein the performing (234) the radar signaling procedure comprises: receiving (234A, 234B) the OTFS signal according to the Rx grant.

4. The method of any of claims 1-2, wherein the first resource grant is a transmit (Tx) grant (222A) for the OTFS signal, and wherein the performing (230) the radar signaling procedure comprises: transmitting (230) the OTFS signal according to the Tx grant.

5. The method of any of claims 1-4, further comprising:receiving (222B. 222C, 222D) a communication grant for a radar measurement report message associated with the OTFS signal; and transmitting (242, 442D). according to the communication grant, the radar measurement report message after the receiving (234A. 234B) the OTFS signal.

6. The method of any of claims 1-2 or 4, further comprising: transmitting (222D), to the receiver (102F), a sidelink communication grant for a radar measurement report message associated with the OTFS signal; and receiving (442D), according to the sidelink communication grant, the radar measurement report message after the transmitting (230) the OTFS signal.

7. The method of any of claim 1-6, further comprising: receiving (250) an object information associated with the OTFS signal based on the performing (230, 234) the radar signaling procedure according to the first resource grant.

8. The method of any of claims 1-7, further comprising: transmitting (202A, 202B), to the network entity (104), a UE capability’ message indicating a capability of the UE (102E, 102F) for the performing (230. 234) the radar signaling procedure using the OTFS signal.

9. The method of claim 8, wherein the OTFS signal includes communication information forming a combined radar and communication signal.

10. A method of radar sensing assistance at a network entity’ (104), comprising: transmitting (222), to a user equipment, UE. (102E, 102F), a first resource grant, the first resource grant being for propagation of an orthogonal time-frequency space, OTFS, signal between a transmitter (102E, 104) and a receiver (102E, 102F, 104), the first resource grant indicating OTFS resources in a delay-doppler domain for a transmission of the OTFS signal; andreceiving (242), from the UE (102E. 102F), a radar measurement report message associated with the propagation of the OTFS signal between the transmitter (102E, 104) and the receiver (102E, 102F, 104).

11. The method of claim 10, further comprising: transmitting (250), to the UE (102E), object information obtained in response to the receiving (242) the radar measurement report message.

12. The method of claim 10, further comprising: receiving (214), from the UE (102E), an OTFS request message for the radar sensing assistance, the first resource grant being responsive to the OTFS request message.

13. The method of any of claims 10-12, wherein the first resource grant is a transmit (Tx) grant (222A) for the OTFS signal propagated between the transmitter (102E, 104) and the receiver (102E, 102F, 104).

14. The method of any of claims 10-13, further comprising: transmitting (222B, 222C), to the UE (102E, 102F), an uplink communication grant for the radar measurement report message associated with the OTFS signal; and receiving (242), from the UE (102E, 102F), the radar measurement report message based on the uplink communication grant.

15. An apparatus for wireless communication comprising a memory, a transceiver, and a processor coupled to the memory and the transceiver, the apparatus being configured to implement a method as in any of claims 1-14.

Images