Coordinated interference nulling with known interferer locations and timings

Abstract

Methods, systems, and devices for wireless communication are described. A user equipment (UE), such as a vehicle, can implement radar transmissions to detect and avoid potential collisions with targets, such as other UEs or pedestrians. A first UE can receive an indication of a location of a second UE and an indication of one or more parameters associated with a radar transmission from the second UE. The first UE can also receive a radio frequency waveform including a first component associated with the radar transmission from the second UE and a second component associated with a reflected radar transmission from the first UE. The first UE can compensate for interference from the first component based on the location of the second UE and the one or more parameters. The first UE can generate a radar image from the received radio frequency waveform based on compensating for the interference.

Description

[0001] Cross-references

[0002] This patent application claims the benefit of U.S. Patent Application No. 17 / 101,315, filed November 23, 2020, entitled "COORDINATED INTERFERENCE CLEANING WITH KNOWN INTERFERER LOCATION AND TIMING", which has been assigned to the assignee of this application and is expressly incorporated herein by reference. Technical Field

[0003] The following content relates to wireless communication, including coordinated interference clearance using known locations and timing of interfering parties.

[0004] background

[0005] Wireless communication systems are widely deployed to provide various types of communication content, such as voice, video, packet data, message sending and receiving, broadcasting, and so on. These systems can support communication with multiple users by sharing available system resources (e.g., time, frequency, and power). Examples of such multiple access systems include fourth-generation (4G) systems (such as Long Term Evolution (LTE) systems, LTE-A Advanced (LTE-A) systems, or LTE-A Pro systems) and fifth-generation (5G) systems, which may be referred to as New Radio (NR) systems. These systems can employ various technologies, such as Code Division Multiple Access (CDMA), Time Division Multiple Access (TDMA), Frequency Division Multiple Access (FDMA), Orthogonal Frequency Division Multiple Access (OFDMA), or Discrete Fourier Transform Extended Orthogonal Frequency Division Multiplexing (DFT-S-OFDM). A wireless multiple access communication system may include one or more base stations or one or more network access nodes, each supporting communication from multiple communication devices simultaneously, which may also be referred to as User Equipment (UE). In some systems, wireless devices (such as UEs, for example, vehicles) may experience interference with signals implemented for target detection and collision avoidance. As an example, a wireless device can transmit radar signals, and these radar signals may be interfered with by another radar signal from another wireless device, which could lead to relatively inaccurate and inefficient target detection.

[0006] As more vehicles incorporate radar, interference between UEs may become more common, potentially obscuring or overwhelming radar reflections from potential collision targets. Such radar transmissions may not include identifying features (such as signatures), and therefore, UEs may have difficulty distinguishing between interference (e.g., radar pulses from other radars that also use radar pulses for collision avoidance) and radar reflections from targets.

[0007] Overview

[0008] The described techniques relate to improved methods, systems, devices, and apparatuses for coordinated interference clearance utilizing known jamming locations and timings. Typically, the described techniques provide for detecting and compensating for interference caused by radar signals transmitted by one or more other user equipment (UEs) for efficient target detection. In some wireless communication systems (e.g., vehicle-to-everything (V2X) systems), a UE (e.g., a vehicle) may transmit one or more indications of position, speed, or heading (e.g., via control signaling, broadcast signaling, information signaling, etc.) and one or more parameters associated with the UE's radar transmissions (e.g., frequency offset, frequency mode, transmission timing, etc.). The receiving UE may receive these indications and, based on the information provided in the one or more indications, identify received radar signals (e.g., waveforms) as interference. For example, a UE may receive signaling via a side link that includes information about nearby UEs. Such information enables the UE to identify interference that may manifest as spurious peaks in the range spectrum of the received frequency signal. The UE can compensate for this interference and more easily identify frequency peaks in the same range spectrum caused by radar reflected from a target. For example, a vehicle user equipment (UE) can receive indications of the location of a second vehicle user equipment (UE) and indications of one or more parameters associated with radar transmissions from the second UE, and can identify portions of the range spectrum affected by radar transmissions from the second UE. The UE can remove data points or portions associated with such radar transmissions and generate radar images identifying radar reflections from a target.

[0009] A method is described. The method may include: receiving an indication of the location of a second user equipment (UE) and an indication of one or more parameters associated with radar transmissions from the second UE; receiving a radio frequency waveform including a first component associated with radar transmissions from the second UE and a second component associated with reflected radar transmissions from a first UE; compensating for interference from the first component of the received radio frequency waveform based on the location of the second UE and the one or more parameters associated with radar transmissions from the second UE; and generating a radar image from the received radio frequency waveform based on the compensation for interference from the first component of the received radio frequency waveform.

[0010] An apparatus is described. The apparatus may include a processor, a memory in electronic communication with the processor, and instructions stored in the memory. These instructions may be executable by the processor to cause the apparatus to: receive an indication of the location of a second UE and an indication of one or more parameters associated with radar transmissions from the second UE; receive a radio frequency waveform including a first component associated with radar transmissions from the second UE and a second component associated with reflected radar transmissions from a first UE; compensate for interference from the first component of the received radio frequency waveform based on the location of the second UE and the one or more parameters associated with radar transmissions from the second UE; and generate a radar image from the received radio frequency waveform based on the compensation for interference from the first component of the received radio frequency waveform.

[0011] An apparatus is described. The apparatus may include: means for receiving an indication of the location of a second UE and an indication of one or more parameters associated with radar transmissions from the second UE; means for receiving a radio frequency waveform including a first component associated with radar transmissions from the second UE and a second component associated with reflected radar transmissions from a first UE; means for compensating for interference from the first component of the received radio frequency waveform based on the location of the second UE and the one or more parameters associated with radar transmissions from the second UE; and means for generating a radar image from the received radio frequency waveform based on the compensation for interference from the first component of the received radio frequency waveform.

[0012] A non-transient computer-readable medium storing code is described. The code may include instructions executable by a processor to perform the following operations: receiving an indication of the location of a second UE and an indication of one or more parameters associated with radar transmissions from the second UE; receiving a radio frequency waveform including a first component associated with radar transmissions from the second UE and a second component associated with reflected radar transmissions from a first UE; compensating for interference from the first component of the received radio frequency waveform based on the location of the second UE and the one or more parameters associated with radar transmissions from the second UE; and generating a radar image from the received radio frequency waveform based on the compensation for interference from the first component of the received radio frequency waveform.

[0013] In some examples of the methods, apparatus (devices) and non-transient computer-readable media described herein, interference compensation may include operations, features, means, or instructions for: generating a spectrum based on a received radio frequency waveform; identifying a portion of the spectrum that includes interference from a first component of the received radio frequency waveform based on the location of the second UE and one or more parameters associated with radar transmissions from the second UE; and removing the identified portion from the spectrum.

[0014] Some examples of the methods, apparatus (devices) and non-transient computer-readable media described herein may further include operations, features, means or instructions for removing an identified portion from the spectrum, including setting the identified portion of the spectrum to empty.

[0015] Some examples of the methods, apparatus (devices) and non-transient computer-readable media described herein may further include operations, features, means or instructions for setting an identified portion of the spectrum to empty, including setting the value of the identified portion of the spectrum to zero.

[0016] Some examples of the methods, apparatus (devices) and non-transient computer-readable media described herein may further include operations, features, means or instructions for actions such as setting an identified portion of the spectrum to empty, including setting the value of the identified portion of the spectrum to a random variable based on the noise level of the spectrum.

[0017] In some examples of the methods, apparatus (devices) and non-transient computer-readable media described herein, the spectrum includes the Doppler spectrum, the direction-of-arrival spectrum, the distance spectrum, or a combination thereof.

[0018] Some examples of the methods, apparatus (devices) and non-transient computer-readable media described herein may further include operations, features, means or instructions for identifying a target based on compensation for interference associated with radar transmissions from a second UE.

[0019] In some examples of the methods, apparatus (devices) and non-transient computer-readable media described herein, reflective radar transmissions from a first UE can be reflected from the target.

[0020] In some examples of the methods, apparatus (devices) and non-transient computer-readable media described herein, indications of the location of the second UE and indications of one or more parameters associated with radar transmissions from the second UE may be received via a sidelink channel.

[0021] In some examples of the methods, apparatus (devices) and non-transient computer-readable media described herein, the indication of the location of the second UE includes GPS signaling from the second UE, explicit indication of location from the second UE, indication of timing of synchronization transmission between the first UE and the second UE, or a combination thereof.

[0022] In some examples of the methods, apparatus (devices) and non-transient computer-readable media described herein, the radar transmission from the second UE comprises a frequency-modulated continuous wave, and the one or more parameters associated with the radar transmission from the second user equipment include one or more of the following: the frequency ramp direction of the frequency-modulated continuous wave, the starting frequency of the frequency-modulated continuous wave, the transmission start time of the frequency-modulated continuous wave, or the duration of each pulse of the frequency-modulated continuous wave.

[0023] In some examples of the methods, apparatus (devices) and non-transient computer-readable media described herein, the one or more parameters indicate the velocity of the second UE or the direction of arrival of the second UE.

[0024] Some examples of the methods, apparatus (devices) and non-transient computer-readable media described herein may further include operations, features, means or instructions for transmitting frequency-modulated continuous waves comprising sweeping chirps of several frequencies.

[0025] In some examples of the methods, apparatus (devices) and non-transient computer-readable media described herein, the reflective radar transmission from the first UE includes reflections of the several frequency sweep chirps.

[0026] A method for wireless communication at a first UE is described. The method may include: receiving an indication of the location of a second UE and an indication of one or more parameters associated with radar transmissions from the second UE; receiving a radio frequency waveform including a first component associated with radar transmissions from the second UE and a second component associated with reflected radar transmissions from the first UE; compensating for interference from the first component of the received radio frequency waveform based on the location of the second UE and the one or more parameters associated with radar transmissions from the second UE; and generating a radar image from the received radio frequency waveform based on the compensation for interference from the first component of the received radio frequency waveform.

[0027] An apparatus for wireless communication at a first UE is described. The apparatus may include a processor, a memory in electronic communication with the processor, and instructions stored in the memory. These instructions may be executed by the processor to cause the apparatus to: receive an indication of the location of a second UE and an indication of one or more parameters associated with radar transmissions from the second UE; receive a radio frequency waveform including a first component associated with radar transmissions from the second UE and a second component associated with reflected radar transmissions from the first UE; compensate for interference from the first component of the received radio frequency waveform based on the location of the second UE and the one or more parameters associated with radar transmissions from the second UE; and generate a radar image from the received radio frequency waveform based on the compensation for interference from the first component of the received radio frequency waveform.

[0028] Another apparatus for wireless communication at a first UE is described. The apparatus may include: means for receiving an indication of the location of a second UE and an indication of one or more parameters associated with radar transmissions from the second UE; means for receiving a radio frequency waveform including a first component associated with radar transmissions from the second UE and a second component associated with reflected radar transmissions from the first UE; means for compensating for interference from the first component of the received radio frequency waveform based on the location of the second UE and the one or more parameters associated with radar transmissions from the second UE; and means for generating a radar image from the received radio frequency waveform based on the compensation for interference from the first component of the received radio frequency waveform.

[0029] A non-transient computer-readable medium is described, storing code for wireless communication at a first UE. The code may include instructions executable by a processor to: receive an indication of the location of a second UE and an indication of one or more parameters associated with radar transmissions from the second UE; receive a radio frequency waveform including a first component associated with radar transmissions from the second UE and a second component associated with reflected radar transmissions from the first UE; compensate for interference from the first component of the received radio frequency waveform based on the location of the second UE and the one or more parameters associated with radar transmissions from the second UE; and generate a radar image from the received radio frequency waveform based on the compensation for interference from the first component of the received radio frequency waveform.

[0030] A method is described. The method may include: receiving an indication of the location of a second UE and an indication of one or more parameters associated with radar transmissions from the second UE; receiving a radio frequency waveform including a first component associated with radar transmissions from the second UE and a second component associated with reflected radar transmissions from a first UE; compensating for interference from the first component of the received radio frequency waveform based on the location of the second UE and the one or more parameters associated with radar transmissions from the second UE; and generating a radar image from the received radio frequency waveform based on the compensation for interference from the first component of the received radio frequency waveform.

[0031] An apparatus is described. The apparatus may include a processor, a memory in electronic communication with the processor, and instructions stored in the memory. These instructions may be executable by the processor to cause the apparatus to: receive an indication of the location of a second UE and an indication of one or more parameters associated with radar transmissions from the second UE; receive a radio frequency waveform including a first component associated with radar transmissions from the second UE and a second component associated with reflected radar transmissions from a first UE; compensate for interference from the first component of the received radio frequency waveform based on the location of the second UE and the one or more parameters associated with radar transmissions from the second UE; and generate a radar image from the received radio frequency waveform based on the compensation for interference from the first component of the received radio frequency waveform.

[0032] An apparatus is described. The apparatus may include: means for receiving an indication of the location of a second UE and an indication of one or more parameters associated with radar transmissions from the second UE; means for receiving a radio frequency waveform including a first component associated with radar transmissions from the second UE and a second component associated with reflected radar transmissions from a first UE; means for compensating for interference from the first component of the received radio frequency waveform based on the location of the second UE and the one or more parameters associated with radar transmissions from the second UE; and means for generating a radar image from the received radio frequency waveform based on the compensation for interference from the first component of the received radio frequency waveform.

[0033] A non-transient computer-readable medium storing code is described. The code may include instructions executable by a processor to perform the following operations: receiving an indication of the location of a second UE and an indication of one or more parameters associated with radar transmissions from the second UE; receiving a radio frequency waveform including a first component associated with radar transmissions from the second UE and a second component associated with reflected radar transmissions from a first UE; compensating for interference from the first component of the received radio frequency waveform based on the location of the second UE and the one or more parameters associated with radar transmissions from the second UE; and generating a radar image from the received radio frequency waveform based on the compensation for interference from the first component of the received radio frequency waveform. Brief description of the attached diagram

[0035] Figure 1 Examples of wireless communication systems that utilize the known location and timing of the interfering party for coordinated interference clearance, supported by various aspects of this disclosure, are explained.

[0036] Figure 2 Examples of wireless communication systems that utilize the known location and timing of the interfering party for coordinated interference clearance, supported by various aspects of this disclosure, are explained.

[0037] Figure 3 An example of a coordinated interference removal scheme utilizing known interference locations and timings, supported by various aspects of this disclosure, is explained.

[0038] Figure 4 An example of a coordinated interference clearance process flow utilizing known interference locations and timings, supported by various aspects of this disclosure, is explained.

[0039] Figure 5 and 6 A block diagram of an apparatus for coordinated interference clearance utilizing known interference locations and timings, in accordance with various aspects of this disclosure, is shown.

[0040] Figure 7 A block diagram of a communication manager supporting coordinated interference clearing using known interference locations and timings, according to various aspects of this disclosure, is shown.

[0041] Figure 8 A diagram of a system including a device supporting coordinated interference clearance utilizing known interference locations and timings, according to various aspects of this disclosure, is shown.

[0042] Figures 9 to 11 A flowchart illustrating a coordinated interference removal method utilizing known interference locations and timings, supported by various aspects of this disclosure, is shown.

[0043] Detailed description

[0044] Frequency-modulated continuous wave (FMCW) radar modes can be implemented in a wide range of applications, including vehicle ranging for target detection. In some examples, FMCW radar can be employed by user equipment (UE) operating in full-duplex mode, which supports simultaneous uplink and downlink transmissions within the same time period. For instance, a vehicle-based UE can transmit FMCW radar to detect potential targets and avoid collisions with detected targets. In some cases, other vehicle-based UEs near the receiving UE may also transmit FMCW radar, which can potentially cause interference that may obscure or overwhelm radar reflected from a target, preventing the UE from easily identifying the target and its location.

[0045] FMCW radar may include several frequency chimes transmitted over a frequency range. For example, a single chime may be initiated at a starting frequency. The chime may sweep across the frequency range in a first direction (e.g., increasing or decreasing the ramp), then change direction and sweep across the frequency range until the starting frequency is reached, at which point a second similar chime may begin. FMCW may include a large number of chimes sweeping across the frequency range. After a period of time, the transmitting UE may receive chimes reflected from a potential target, wherein the time elapsed between transmitting the FMCW chime and receiving the reflected chime is proportional to the ranging or distance of the target. For example, the UE may receive the reflected FMCW radar and generate a range spectrum for identifying potential targets. As a supplement or replacement to generating the range spectrum, the UE may generate a Doppler spectrum for identifying the target's velocity and a direction-of-arrival (DoA) spectrum for identifying the target's direction of motion. The UE may use one or more of these spectra to identify and potentially prevent collisions with targets.

[0046] In some cases, when generating the one or more spectra, the UE may include signal waveforms received from another UE also transmitting radar. This received waveform can be considered interference. In some cases, the interfering UE may also transmit FMCW chirps, sweeping in the same or different directions as the receiving UE. For example, both the interfering and receiving UEs may transmit FMCW chirps that sweep through increasing frequencies, then through decreasing frequencies, or vice versa. In such cases, radar signals received from the interfering UE may be included in the one or more spectra as spurious peaks, sometimes referred to as phantom targets or false peaks. In some examples, spurious peaks may be caused by strong interference and may mask or obscure target peaks. This may prevent or obscure the UE from efficiently identifying the target. In some examples, the interfering and receiving UEs may transmit FMCW chirps that sweep through a frequency range (e.g., frequency ramps) in opposite directions, which may cause broadband noise in the one or more spectra and may also prevent or obscure the UE from efficiently identifying the target. This interference may be mistaken by the receiving UE as a target radar echo, or it may mask the target radar echo. However, the UE may be able to communicate with the interfering UE via one or more vehicle-to-everything (V2X) channels to coordinate radar transmissions and compensate for interference caused by false targets.

[0047] For example, the interfering UE can transmit one or more indications to the receiving UE via a V2X interface (e.g., PC5) regarding radar transmission timing, one or more chirp parameters (e.g., sweep direction (e.g., ramp), start frequency, etc.). The receiving UE can calculate one or more spectra (e.g., range, Doppler, or DoA) by receiving radar data from the interfering UE and any potential target, and can use the information provided by the one or more indications transmitted by the interfering UE to predict the locations of possible spurious peaks on one or more spectra. The receiving UE can adjust a single or multiple spectra to compensate for identified spurious peaks by removing data points caused by interference. For example, the receiving UE can set the interference data points to zero or a random variable corresponding to the noise level of the received radar, among other techniques. Such techniques may be referred to as jamming neutralization. The receiving UE can use the adjusted one or more spectra along with any unadjusted spectra to generate a radar image to more easily identify potential targets.

[0048] The aspects of this disclosure are initially described in the context of wireless communication systems. The aspects of this disclosure are subsequently described in the context of systems and signal processing schemes. The aspects of this disclosure are further explained and described with reference to apparatus diagrams, system diagrams, and flowcharts relating to coordinated interference clearance utilizing known interfering party locations and timings.

[0049] Figure 1 Examples of a wireless communication system 100 supporting coordinated interference clearance utilizing known interfering party locations and timings, according to various aspects of this disclosure, are described. The wireless communication system 100 may include one or more base stations 105, one or more UEs 115, and a core network 130. In some examples, the wireless communication system 100 may be a Long Term Evolution (LTE) network, an Advanced LTE (LTE-A) network, an LTE-A Pro network, or a New Radio (NR) network. In some examples, the wireless communication system 100 may support enhanced broadband communication, ultra-reliable (e.g., mission-critical) communication, low latency communication, communication with low-cost and low-complexity devices, or any combination thereof.

[0050] Base station 105 can be distributed across a geographical area to form wireless communication system 100, and can be different types of devices or devices with different capabilities. Base station 105 and UE 115 can communicate wirelessly via one or more communication links 125. Each base station 105 can provide a coverage area 110, and UE 115 and base station 105 can establish one or more communication links 125 on the coverage area 110. Coverage area 110 can be an example of a geographical area over which base station 105 and UE 115 can support signal communication according to one or more radio access technologies.

[0051] Each UE 115 can be distributed throughout the coverage area 110 of the wireless communication system 100, and each UE 115 can be stationary or mobile, or stationary and mobile at different times. Each UE 115 can be a different type of device or a device with different capabilities. Figure 1 The document describes some example UE 115s. The UE 115 described herein can communicate with various types of devices, such as other UE 115s, base station 105, or network equipment (e.g., core network nodes, relay equipment, integrated access and backhaul (IAB) nodes, or other network equipment). Figure 1 As shown in the image.

[0052] Each base station 105 may communicate with the core network 130, or with each other, or both. For example, base station 105 may interface with the core network 130 via one or more backhaul links 120 (e.g., via S1, N2, N3, or other interfaces). Base stations 105 may communicate with each other directly (e.g., directly between base stations 105), indirectly (e.g., via the core network 130), or directly and indirectly on backhaul links 120 (e.g., via X2, Xn, or other interfaces). In some examples, backhaul link 120 may be or include one or more radio links.

[0053] One or more of the base stations 105 described herein may include, or may be referred to by those skilled in the art as, base transceiver station, radio base station, access point, radio transceiver, B node, evolved B node (eNB), next-generation B node or gigabit B node (any of which may be referred to as gNB), home B node, home evolved B node, or other suitable terms.

[0054] UE 115 may include or be referred to as a mobile device, wireless device, remote device, handheld device, or subscriber device, or some other suitable term, wherein the device may also be referred to as a cell, station, terminal, or client, etc. UE 115 may also include or be referred to as a personal electronic device, such as a cellular phone, personal digital assistant (PDA), tablet computer, laptop computer, or personal computer. In some examples, UE 115 may include or be referred to as a wireless local loop (WLL) station, Internet of Things (IoT) device, Internet of Everything (IoE) device, or machine-type communication (MTC) device, which may be implemented in various objects such as appliances or vehicles, meters, etc.

[0055] The UE 115 described herein can communicate with various types of devices, such as other UEs 115 that sometimes act as relays, as well as base station 105 and network equipment including macro eNBs or gNBs, small cell eNBs or gNBs, relay base stations, etc. Figure 1 As shown in the image.

[0056] UE 115 and base station 105 can wirelessly communicate with each other via one or more communication links 125 on one or more carriers. The term "carrier" can refer to a set of radio frequency spectrum resources having a defined physical layer structure for supporting communication link 125. For example, a carrier for communication link 125 may include a portion of the radio spectrum band (e.g., a bandwidth portion (BWP)) operating according to one or more physical layer channels for a given radio access technology (e.g., LTE, LTE-A, LTE-A Pro, NR). Each physical layer channel may carry acquisition signaling (e.g., synchronization signals, system information), control signaling coordinating carrier operation, user data, or other signaling. Wireless communication system 100 may support communication with UE 115 using carrier aggregation or multi-carrier operation. UE 115 may be configured to have multiple downlink component carriers and one or more uplink component carriers according to a carrier aggregation configuration. Carrier aggregation can be used in conjunction with frequency division duplex (FDD) and time division duplex (TDD) component carriers.

[0057] The signal waveform transmitted on the carrier may include multiple subcarriers (e.g., using multi-carrier modulation (MCM) techniques, such as orthogonal frequency division multiplexing (OFDM) or discrete Fourier transform extended OFDM (DFT-S-OFDM)). In a system employing MCM, a resource element may include a symbol period (e.g., the duration of a modulation symbol) and a subcarrier, where the symbol period and subcarrier spacing are inversely related. The number of bits carried by each resource element may depend on the modulation scheme (e.g., the order of the modulation scheme, the code rate of the modulation scheme, or both). Thus, the more resource elements the UE 115 receives and the higher the order of the modulation scheme, the higher the data rate the UE 115 can achieve. Wireless communication resources can refer to a combination of radio frequency spectrum resources, temporal resources, and spatial resources (e.g., spatial layers or beams), and using multiple spatial layers can further improve the data rate or data integrity of communication with the UE 115.

[0058] The time interval of base station 105 or UE 115 can be expressed as a multiple of a basic time unit, such as the sampling period. T s =1 ( Δf max Nf ) seconds, of which Δf max This can represent the maximum supported subcarrier spacing, while NfThis can represent the maximum supported Discrete Fourier Transform (DFT) size. The time interval of the communication resources can be organized according to radio frames, each with a specified duration (e.g., 10 milliseconds (ms)). Each radio frame can be identified by a System Frame Number (SFN) (e.g., ranging from 0 to 1023).

[0059] Each frame may include multiple consecutively numbered subframes or time slots, and each subframe or time slot may have the same duration. In some examples, a frame may (e.g., in the time domain) be divided into subframes, and each subframe may be further divided into several time slots. Alternatively, each frame may include a variable number of time slots, and the number of time slots may depend on the subcarrier spacing. Each time slot may include several symbol periods (e.g., depending on the length of the cyclic prefix added before each symbol period). In some wireless communication systems 100, time slots may be further divided into multiple mini-time slots containing one or more symbols. Excluding the cyclic prefix, each symbol period may contain one or more (e.g., Nf (Number) sampling periods. The duration of a symbol period can depend on the subcarrier spacing or the operating frequency band.

[0060] A subframe, time slot, mini-slot, or symbol can be the smallest scheduling unit of the wireless communication system 100 (e.g., in the time domain) and can be referred to as a transmission time interval (TTI). In some examples, the duration of the TTI (e.g., the number of symbol periods in the TTI) can be variable. Additionally or alternatively, the smallest scheduling unit of the wireless communication system 100 can be dynamically selected (e.g., in bursts of shortened TTIs (sTTIs)).

[0061] Physical channels can be multiplexed on a carrier using various techniques. Physical control channels and physical data channels can be multiplexed on a downlink carrier, for example, using one or more of time-division multiplexing (TDM), frequency-division multiplexing (FDM), or hybrid TDM-FDM techniques. A control region (e.g., a control resource set (CORESET)) for physical control channels can be defined by the number of symbol periods and can extend across the system bandwidth or a subset of the system bandwidth of the carrier. One or more control regions (e.g., CORESET) can be configured for a set of UEs 115. For example, one or more of the UEs 115 can monitor or search control regions for control information based on one or more search space sets, and each search space set can include one or more control channel candidates in one or more aggregation levels arranged in a cascaded manner. An aggregation level for control channel candidates can refer to the number of control channel resources (e.g., control channel elements (CCEs)) associated with coded information in a control information format having a given payload size. The search space set may include a common search space set configured to send control information to multiple UEs 115 and a UE-specific search space set configured to send control information to a specific UE 115.

[0062] In some examples, base station 105 may be mobile, and thus provide communication coverage to mobile geographic coverage areas 110. In some examples, different geographic coverage areas 110 associated with different technologies may overlap, but the different geographic coverage areas 110 may be supported by the same base station 105. In other examples, overlapping geographic coverage areas 110 associated with different technologies may be supported by different base stations 105. Wireless communication system 100 may include, for example, a heterogeneous network, in which different types of base stations 105 use the same or different radio access technologies to provide coverage to various geographic coverage areas 110.

[0063] The wireless communication system 100 can support synchronous or asynchronous operation. For synchronous operation, base stations 105 can have similar frame timing, and transmissions from different base stations 105 can be approximately time-aligned. For asynchronous operation, base stations 105 can have different frame timing, and transmissions from different base stations 105 may not be time-aligned in some examples. The techniques described herein can be used for both synchronous and asynchronous operation.

[0064] Some UE 115 devices (such as MTC or IoT devices) can be low-cost or low-complexity devices and can provide automated communication between machines (e.g., via machine-to-machine (M2M) communication). M2M communication or MTC can refer to data communication technologies that allow devices to communicate with each other or with base station 105 without human intervention. In some examples, M2M communication or MTC may include communication from devices that have integrated sensors or meters to measure or capture information and relay such information to a central server or application that uses the information or presents it to people interacting with the application. Some UE 115 devices may be designed to collect information or automate the behavior of machines or other devices. Examples of applications for MTC devices include: smart metering, inventory monitoring, water level monitoring, equipment monitoring, healthcare monitoring, wilderness survival monitoring, weather and geographic event monitoring, queue management and tracking, remote security sensing, physical access control, and transaction-based commercial toll collection.

[0065] Some UEs 115 can be configured to operate in reduced-power modes, such as half-duplex communication (e.g., a mode that supports unidirectional communication via transmission or reception but not simultaneous transmission and reception). In some examples, half-duplex communication can be performed at reduced peak rates. Other power-saving techniques for UEs 115 include entering a power-saving deep sleep mode when not engaged in active communication, operating on limited bandwidth (e.g., according to narrowband communication), or a combination of these techniques. For example, some UEs 115 can be configured to operate using a narrowband protocol type associated with a defined portion or range (e.g., a subcarrier or resource block (RB) set) within the carrier, within the carrier's guard band, or outside the carrier.

[0066] Wireless communication system 100 may be configured to support ultra-reliable communication or low latency communication, or various combinations thereof. For example, wireless communication system 100 may be configured to support ultra-reliable low latency communication (URLLC) or mission-critical communication. UE 115 may be designed to support ultra-reliable, low latency, or mission-critical functions (e.g., mission-critical functions). Ultra-reliable communication may include private or group communication and may be supported by one or more mission-critical services, such as Mission-Critical Talk-to-Talk (MCPTT), Mission-Critical Video (MCVideo), or Mission-Critical Data (MCData). Support for mission-critical functions may include prioritization of services, and mission-critical services may be used for public safety or general commercial applications. The terms ultra-reliable, low latency, mission-critical, and ultra-reliable low latency are used interchangeably herein.

[0067] In some examples, UE 115 may also be able to communicate directly with other UE 115 on a device-to-device (D2D) communication link 135 (e.g., using a peer-to-peer (P2P) or D2D protocol). One or more UE 115s utilizing D2D communication may be within the geographic coverage area 110 of base station 105. Other UE 115s in such a group may be outside the geographic coverage area 110 of base station 105 or may be unable to receive transmissions from base station 105 for other reasons. In some examples, groups of UE 115s communicating via D2D communication may utilize a one-to-many (1:M) system, where each UE 115 transmits to every other UE 115 in the group. In some examples, base station 105 facilitates the scheduling of resources for D2D communication. In other cases, D2D communication is performed between the individual UE 115s without involving base station 105.

[0068] In some systems, the D2D communication link 135 may be an example of a communication channel (such as a sidelink communication channel) between vehicles (e.g., UE 115). In some examples, vehicles may communicate using vehicle-to-vehicle (V2X) communication, vehicle-to-vehicle (V2V) communication, or some combination of these communications. Vehicles may signal information related to traffic conditions, signaling, weather, safety, emergencies, or any other information relevant to the V2X system. In some examples, vehicles in a V2X system may communicate via vehicle-to-network (V2N) communication through one or more network nodes (e.g., base station 105) with roadside infrastructure (such as roadside units), or with the network, or with both.

[0069] Core network 130 provides user authentication, access authorization, tracking, Internet Protocol (IP) connectivity, and other access, routing, or mobility functions. Core network 130 can be an evolved packet core (EPC) or a 5G core (5GC). The EPC or 5GC may include at least one control plane entity (e.g., a Mobility Management Entity (MME), Access and Mobility Management Function (AMF)) managing access and mobility, and at least one user plane entity (e.g., a Serving Gateway (S-GW), Packet Data Network (PDN) Gateway (P-GW), or User Plane Function (UPF)) routing packets or interconnecting to external networks. The control plane entity manages non-access stratum (NAS) functions, such as mobility, authentication, and bearer management of UE 115 served by base station 105 associated with core network 130. User IP packets can be delivered through the user plane entity, which provides IP address allocation and other functions. The user plane entity may be connected to one or more network operator IP services 150. The IP service 150 may include access to the Internet, intranet, IP Multimedia Subsystem (IMS), or packet-switched streaming services.

[0070] Some network devices (such as base station 105) may include sub-components, such as access network entity 140, which may be an example of an access node controller (ANC). Each access network entity 140 may communicate with each UE 115 through one or more other access network transport entities 145, which may be referred to as a radio headend, smart radio headend, or transmit / receive point (TRP). Each access network transport entity 145 may include one or more antenna panels. In some configurations, the various functions of each access network entity 140 or base station 105 may be distributed across various network devices (e.g., radio headends and ANCs) or combined into a single network device (e.g., base station 105).

[0071] Wireless communication system 100 can operate using one or more frequency bands, typically in the range of 300 MHz to 300 GHz. Generally, the 300 MHz to 3 GHz band is referred to as a UHF band or decimeter band because the wavelengths range from approximately 1 decimeter to 1 meter. UHF waves can be blocked or redirected by buildings and environmental features, but these waves can penetrate various structures sufficiently for macrocells to provide service to UE 115 located indoors. Compared to transmissions using smaller frequencies and longer waves in the lower HF or VHF portions of the spectrum below 300 MHz, UHF wave transmission can be associated with smaller antennas and shorter ranges (e.g., less than 100 km).

[0072] Wireless communication system 100 may utilize both licensed and unlicensed radio spectrum bands. For example, wireless communication system 100 may employ licensed assisted access (LAA), LTE unlicensed (LTE-U) radio access technology, or NR technology in unlicensed frequency bands, such as the 5 GHz Industrial, Scientific, and Medical (ISM) band. When operating in unlicensed radio spectrum bands, devices (such as base station 105 and UE 115) may employ carrier sensing for collision detection and avoidance. In some examples, operation in unlicensed frequency bands may be based on carrier aggregation configuration (e.g., LAA) in coordination with component carriers operating in licensed frequency bands. Operation in unlicensed spectrum may include downlink transmissions, uplink transmissions, P2P transmissions, or D2D transmissions, etc.

[0073] Base station 105 or UE 115 may be equipped with multiple antennas that can be used to employ technologies such as transmit diversity, receive diversity, multiple-input multiple-output (MIMO) communication, or beamforming. The antennas of base station 105 or UE 115 may be located within one or more antenna arrays or antenna panels that can support MIMO operation or transmit or receive beamforming. For example, one or more base station antennas or antenna arrays may be co-located at an antenna assembly (such as an antenna tower). In some examples, the antennas or antenna arrays associated with base station 105 may be located in different geographical locations. Base station 105 may have an antenna array with several rows and columns of antenna ports that base station 105 can use to support beamforming for communication with UE 115. Similarly, UE 115 may have one or more antenna arrays that can support various MIMO or beamforming operations. Additionally or alternatively, the antenna panel may support radio frequency beamforming for signals transmitted via the antenna ports.

[0074] Base station 105 or UE 115 can use MIMO communication to leverage multipath signal propagation and improve spectral efficiency by transmitting or receiving multiple signals via different spatial layers. This technique is known as spatial multiplexing. For example, a transmitting device may transmit multiple signals via different antennas or different combinations of antennas. Similarly, a receiving device may receive multiple signals via different antennas or different combinations of antennas. Each of the multiple signals may be referred to as a separate spatial stream and may carry bits associated with the same data stream (e.g., the same codeword) or different data streams (e.g., different codewords). Different spatial layers may be associated with different antenna ports used for channel measurement and reporting. MIMO techniques include single-user MIMO (SU-MIMO), where multiple spatial layers are transmitted to the same receiving device; and multi-user MIMO (MU-MIMO), where multiple spatial layers are transmitted to multiple devices.

[0075] Beamforming (also known as spatial filtering, directional transmission, or directional reception) is a signal processing technique that can be used at a transmitting or receiving device (e.g., base station 105, UE 115) to shape or guide an antenna beam (e.g., a transmit beam, a receive beam) along a spatial path between the transmitting and receiving devices. Beamforming can be achieved by combining signals transmitted via antenna elements of an antenna array, such that some signals propagating relative to a particular orientation of the antenna array experience constructive interference, while others experience destructive interference. Adjustments to the signals transmitted via the antenna elements may include the transmitting or receiving device applying amplitude offset, phase offset, or both to the signals carried via the antenna elements associated with that device. The adjustments associated with each antenna element may be defined by a beamforming weight set associated with a particular orientation (e.g., the antenna array relative to the transmitting or receiving device, or relative to some other orientation).

[0076] Base station 105 or UE 115 may use beamsweeping technology as part of beamforming operations. For example, base station 105 may use multiple antennas or antenna arrays (e.g., antenna panels) to perform beamforming operations for directional communication with UE 115. Some signals (e.g., synchronization signals, reference signals, beam selection signals, or other control signals) may be transmitted multiple times by base station 105 in different directions. For example, base station 105 may transmit signals according to different beamforming weight sets associated with different transmission directions. Transmissions in different beam directions may be used (e.g., by the transmitting device (such as base station 105) or the receiving device (such as UE 115)) to identify the beam direction that base station 105 will use for later transmission or reception.

[0077] Some signals, such as data signals associated with a specific receiving device, may be transmitted by base station 105 in a single beam direction (e.g., the direction associated with the receiving device, such as UE 115). In some examples, the beam direction associated with transmission along a single beam direction may be determined based on the signals transmitted in one or more beam directions. For example, UE 115 may receive one or more signals transmitted by base station 105 in different directions and may report to base station 105 an indication of the signals received by UE 115 with the highest signal quality or other acceptable signal quality.

[0078] In some examples, transmissions performed by a device (e.g., by base station 105 or UE 115) may be performed using multiple beam directions, and the device may use a combination of digital precoding or radio frequency beamforming to generate combined beams for transmission (e.g., from base station 105 to UE 115). UE 115 may report feedback indicating precoding weights for one or more beam directions, and this feedback may correspond to a configured number of beams across the system bandwidth or one or more subbands. Base station 105 may transmit reference signals that can be precoded or unprecoded (e.g., cell-specific reference signals (CRS), channel state information reference signals (CSI-RS)). UE 115 may provide feedback for beam selection, which may be a precoding matrix indicator (PMI) or codebook-based feedback (e.g., multi-panel type codebook, linear combination type codebook, port selection type codebook). Although these techniques are described with reference to signals transmitted by base station 105 in one or more directions, UE 115 may use similar techniques to transmit signals multiple times in different directions (e.g., to identify the beam direction used by UE 115 for subsequent transmission or reception) or to transmit signals in a single direction (e.g., to transmit data to a receiving device).

[0079] A receiver device (e.g., UE 115) may attempt multiple receive configurations (e.g., directional listening) when receiving various signals (such as synchronization signals, reference signals, beam selection signals, or other control signals) from base station 105. For example, the receiver device may attempt multiple receive directions by: receiving via different antenna subarrays; processing received signals according to different antenna subarrays; receiving according to different sets of receive beamforming weights applied to signals received at multiple antenna elements of the antenna array (e.g., different directional listening weight sets); or processing received signals according to different sets of receive beamforming weights applied to signals received at multiple antenna elements of the antenna array, any of which may be referred to as "listening" according to different receive configurations or receive directions. In some examples, the receiver device may use a single receive configuration to receive along a single beam direction (e.g., when a data signal is received). The single receive configuration may be aligned on a beam direction determined based on listening according to different receive configuration directions (e.g., a beam direction determined to have the highest signal strength, highest signal-to-noise ratio (SNR), or other acceptable signal quality based on listening according to multiple beam directions).

[0080] The wireless communication system 100 can be a packet-based network operating according to a layered protocol stack. In the user plane, communication at the bearer or Packet Data Convergence Protocol (PDCP) layer can be IP-based. The Radio Link Control (RLC) layer performs packet segmentation and reassembly for communication on logical channels. The Media Access Control (MAC) layer performs priority handling and multiplexes logical channels into transport channels. The MAC layer can also use error detection, error correction, or both to support MAC layer retransmissions to improve link efficiency. In the control plane, the Radio Resource Control (RRC) protocol layer can provide the establishment, configuration, and maintenance of RRC connections between the UE 115 and the base station 105 or core network 130 that support user plane data radio bearers. At the physical layer, transport channels can be mapped to physical channels.

[0081] UE 115 and base station 105 can support data retransmission to increase the likelihood of successful data reception. Hybrid Automatic Repeat Request (HARQ) feedback is a technique used to increase the likelihood of correctly receiving data on communication link 125. HARQ may include a combination of error detection (e.g., using Cyclic Redundancy Check (CRC)), forward error correction (FEC), and retransmission (e.g., Automatic Repeat Request (ARQ)). HARQ can improve MAC layer throughput in poor radio conditions (e.g., low signal-to-noise ratio conditions). In some examples, the device may support simultaneous time-slot HARQ feedback, where the device can provide HARQ feedback in a specific time slot for data received in previous symbols within that time slot. In other cases, the device may provide HARQ feedback in subsequent time slots or according to some other time interval.

[0082] UE 115 can transmit FMCW radar in full-duplex mode in a wide range of applications, including vehicle ranging for target detection. UE 115 can receive several indications from one or more other UE 115s via V2X communication and other examples. These indications may include information about the location of another UE 115 and one or more parameters associated with the radar transmission originating from that other UE 115. For example, UE 115 may receive indications of the location of other UEs, including Global Positioning System (GPS) data or positioning capabilities; indications of distances associated with the radar of other UE 115s; indications of one or more of the following: the frequency ramp direction of the FMCW transmitted by the other UE 115; the start frequency of the FMCW transmitted by the other UE 115; the transmission start time of the FMCW transmitted by the other UE 115; or the duration of each pulse of the FMCW; or it may receive synchronization information for synchronizing the radar of UE 115 with the radar of another UE 115. UE 115 may also receive radio frequency waveforms (e.g., FMCW radar) including radar transmissions from another UE 115, as well as reflected radar transmissions from the first UE that are reflected by a target.

[0083] UE 115 can generate a spectrum based on received radio frequency waveforms. For example, UE 115 can generate a range spectrum, Doppler spectrum, or DoA spectrum. UE 115 can identify portions of the spectrum affected by interference based on indications received from another UE 115, and can modify the spectrum to compensate for the interference. For example, UE 115 can remove data points associated with the interference, set these data points to zero, or set these data points to random values ​​based on the noise level of the spectrum. UE 115 can generate a radar image based on the modified spectrum, which can suppress false targets caused by interference. Compared to identifying targets from a radar image generated without compensating for interference, UE 115 can more easily identify targets from a radar image generated from a modified spectrum.

[0084] Figure 2 Examples of a wireless communication system 200 supporting coordinated interference clearance utilizing known interfering party locations and timings, according to various aspects of this disclosure, are described. In some examples, the wireless communication system 200 may implement aspects of the wireless communication system 100. For example, the wireless communication system 200 includes UE 115-a and UE 115-b, which may be as described in reference... Figure 1 An example of UE 115 is described. Wireless communication system 200 also includes target 215. In some examples, wireless communication system 200 may implement aspects of wireless communication system 100. For example, UE 115-a in wireless communication system 200 may implement communication for coordinated interference clearance utilizing known interfering party locations and timings.

[0085] UE 115-a and UE 115-b may transmit signals 205-a and 205-b, respectively. In some cases, in full-duplex mode (e.g., where data or radar signals can be transmitted and received simultaneously at either UE 115-a or UE 115-b), UE 115-a may transmit signal 205-a, while UE 115-b may transmit signal 205-b. In some cases, UE 115-b may transmit sidelink signaling 220 to UE 115-a. As an illustrative example, signals 205-a and 205-b may be examples of FMCW radar signals, which can enable UE 115-a to have various functionalities (e.g., ranging, environment and object detection, autonomous driving, etc.). However, in some examples, signals 205-a and 205-b may interfere with each other or interfere with other signals 205. For example, UE 115-a may be an example of a vehicle moving toward UE 115-b. UE 115-b may transmit signal 205-b (e.g., an FMCW radar signal) at the time when UE 115-a is transmitting signal 205-a or on the resources where UE 115-b is transmitting signal 205-a. In such an example, signal 205-b may cause relatively strong interference to signal 205-a from UE 115-a (e.g., signal 205-b may block the reception of reflected signal 210), which may degrade ranging accuracy and object detection (e.g., detection of target 215).

[0086] Accordingly, the techniques described herein enable UE 115 to perform interference clearance operations, for example, in a radar system, which reduces the impact of interference in the wireless communication system 200 and results in more efficient target detection. Additionally or alternatively, UE 115 can implement one or more clearance procedures for radar interference taking into account the spectrum (e.g., range spectrum, Doppler spectrum, DoA spectrum). For example, UE 115-a can perform a clearance procedure by identifying interference caused by signal 205-b based on information received via sidelink signaling 220 and removing data points associated with that interference, which can lead to relatively more accurate target detection.

[0087] UE 115-b may transmit an indication of its location to UE 115-a via sidelink signaling 220. For example, the indication of UE 115-b's location may include GPS signaling, an explicit indication of location, an indication of the timing of synchronization transmission between UE 115-a and UE 115-b, or any combination thereof. UE 115-a may additionally or alternatively receive from UE 115-b an indication of a set of transmission parameters for the transmitted waveform of signal 205-b. In some examples, the transmission parameters may be examples of "chirp" parameters for the loop of the FMCW radar signal. In some examples, transmission parameters may include a start frequency, bandwidth sweep range (e.g., the waveform may be transmitted across a 1 GHz range, a 1.5 GHz range, and other examples of bandwidth sweep ranges), sweep time (e.g., UE 115-a may complete a bandwidth sweep of the waveform within 2 microseconds, 6 microseconds, 12 microseconds, etc.), sweep direction (e.g., the waveform chirp may point from a higher frequency to a lower frequency, or vice versa), and other examples of transmission parameters. In some cases, an indication of location, an indication of one or more parameters, or both may be received from a roadside UE (not shown), and information about UE 115-b may be indicated. UE 115-a may use the location and parameter set of UE 115-b to identify interference caused by signal 205-b.

[0088] For example, UE 115-a may receive radar signal 205-b, and may also receive reflected radar signal 210 reflected by target 215. Without prior knowledge from UE 115-b, UE 115-a may not be able to determine whether the received radar signal is an echo from its own source (e.g., reflected signal 210) or from interference (e.g., radar signal 205-b). However, based on indications of location or indications of one or more parameters, or both, UE 115-a may determine the portion of the spectrum caused by interference.

[0089] For example, UE 115-b may be located at a certain distance from UE 115-a. UE 115-a may determine the distance and transmit power of UE 115-b based on an indication of location or an indication of one or more parameters, or both. Based on the location and transmit power information, UE 115-a may be able to predict corresponding peaks in the spectrum. For example, the spectrum may show two peaks, which may be caused by objects at the same distance from UE 115-a, such as target 215, interfering UE 115-b, or both. In some cases, one of the peaks may have a strength corresponding to the peak strength of the interfering party estimated based on received indications, where the second peak may be smaller because it may be caused by reflected signals. In such cases, the stronger peak may be associated with UE 115-b, while the weaker peak may be identified as target 215, such as a pedestrian. In some cases, among other things, false peaks may be identified based on the estimated distance of UE 115-b corresponding to the false peak. UE 115-a can generate a spectrum for each chirp of signal 205-a.

[0090] Based on the fact that one or more peaks in the identification spectrum are caused by interference, UE 115-a can clear the interference-induced portion of the spectrum, making it easier to identify the true target. For example, UE 115-a can reduce interference-induced peaks. For example, UE 115-a can replace data points associated with interference with zeros, or it can replace data points with random variables based on noise levels. In some cases, white noise can be added to compensate for interference in a process known as jitter.

[0091] Based on interference compensation in the spectrum, UE 115-a can generate radar images. For example, UE 115-a can perform a Fast Fourier Transform (FFT) on each of several spectra to generate a 3D radar image. As a non-limiting example, UE 115-a can compensate for interference in the range spectrum, perform an FFT on the range spectrum, perform an FFT on the Doppler spectrum, and then perform an FFT on the DoA spectrum (where each spectrum is generated by the received signal 205-b and the reflected signal 210). Based on the interference compensation, the radar image is less affected by interference from UE 115-b, and targets are easier to identify. UE 115-a can identify targets based on the radar image and can estimate the position, velocity, and direction of travel of target 215. UE 115-a can use these parameters to avoid collisions with target 215.

[0092] Figure 3An example of a coordinated interference clearing scheme 300 utilizing known interference location and timing, supported by various aspects of this disclosure, is explained. The signal processing scheme may include a frequency-time diagram 305 showing the transmitted FMCW and reflected FMCW, a first range spectrum 310, and a second range spectrum 315, which may be as shown in reference... Figure 2 An example of the described spectrum.

[0093] Frequency-time diagram 305 illustrates examples of several pulses of the FMCW, which may also be referred to as a chirp. The UE (e.g., UE 115 described with reference to wireless communication systems 100 and 200) can estimate the instantaneous frequency Δ by measuring the frequency difference between the transmitted FMCW and the reflected FMCW at a given time. For example, the instantaneous frequency Δ may also be referred to as the beat frequency, and is determined by… f b = βτ It means that, among them τ It is the delay between transmitting the FMCW chirp and receiving the reflected FMCW chirp, and β It is the slope of the chirped frequency sweep. Based on the instantaneous frequency Δ, the UE can calculate or estimate... τ Its value is proportional to the distance to the target. In some cases, the received signal may be received from other UEs transmitting radar signals, and may cause interference at the UE.

[0094] In some examples, the UE can generate a range spectrum 310 based on the measured instantaneous frequency Δ. The range spectrum 310 illustrates peaks caused by false targets and real targets, such as radar signals or waveforms received from other UEs near the receiving UE, and real targets caused by reflected radar signals from the receiving UE. In cases where the UE measures the instantaneous frequency Δ of a signal interfering with another UE, the range spectrum may include large peaks that can mask or obscure peaks caused by measuring the instantaneous frequency Δ of a waveform signal reflected from a target.

[0095] As referenced in this article Figure 2 As described, the UE can use one or more indications received from the interfering UE to mitigate spurious targets. For example, range spectrum 315 illustrates an example where the UE has adjusted data points identified as being associated with interference. The UE can adjust the data points by setting the data to zero, setting the data points to random variables, or through various other methods. In any case, the UE reduces the spikes caused by spurious targets to more effectively identify spikes caused by real targets.

[0096] Figure 4Examples of a process flow 400 for coordinated interference clearance utilizing known interfering party locations and timings, supported by various aspects of this disclosure, are described. In some examples, process flow 400 may implement various aspects of wireless communication systems 100 and 200. Process flow 400 includes UE 115-c, UE 115-d, and target 405.

[0097] In the following description of process flow 400, operations between UE 115-c, UE 115-d and target 405 may be transmitted in a different order than the example order shown (e.g., transmitted from UE 115 or reflected from target 405), or operations performed by UE 115-c and UE 115-d may be performed in a different order or at different times. Some operations may also be excluded from process flow 400, or other operations may be added to process flow 400. It should be understood that although UE 115-c and UE 115-d are shown as performing several operations of process flow 400, any wireless device (e.g., as referenced) may also perform these operations. Figure 1 The described base station 105 can also perform the operations shown. Process flow 400 can be explained as coordinated interference clearing using known interference location and timing.

[0098] At 410, UE 115-c may receive one or more sidelink indications from UE 115-d. For example, UE 115-d may inform UE 115-c of its location, transmission timing, chirp parameters, or any combination thereof. In some cases, the one or more sidelink indications may be transmitted via V2X signaling (e.g., broadcast signaling, multicast signaling, unicast signaling, control signaling, etc.). In some cases, UE 115-d may transmit an indication of its location using GPS signaling, an explicit indication of its location from a second UE, an indication of the timing of synchronization transmission between the first UE and the second UE, or a combination thereof. In some cases, UE 115-d may also transmit an indication of one or more parameters associated with the radar waveform it transmits, including one or more of the following: the timing of the radar transmission (e.g., the time of the start of the radar transmission or FMCW wave), the starting frequency of the chirp in the FMCW wave, the sweep direction of the chirp, the duration of each chirp, or any combination thereof.

[0099] At 415, UE 115-c can transmit FMCW (e.g., radio frequency waveform), which can reach target 405 and be reflected back to UE 115-c at 420.

[0100] At 425, UE 115-c can receive radio frequency waveforms from UE 115-d. For example, UE 115-d may also be transmitting FMCW for ranging and target detection. UE 115-c can receive interfering FMCW along with reflected FMCW, and at 430, can generate a spectrum based on the received waveforms. In some cases, the UE can generate a range spectrum, a Doppler spectrum, a DoA spectrum, or any combination thereof. The spectrum may include spurious peaks due to the frequency waveform from UE 115-d, and may include true peaks due to waveforms reflected from targets. If the interference including spurious targets is strong or mistaken for radar echoes, UE 115-c may be unable to identify the real target.

[0101] At position 435, UE 115-c can identify portions of the spectrum caused by interference from UE 115-d. For example, based on sidelink indications received from UE 115-d, UE 115-c can estimate the location of spurious peaks in the spectrum caused by UE 115-d. In some cases, UE 115-c can estimate the location of spurious peaks based on probabilistic data association algorithms. In some cases, UE 115-c can estimate the distance to UE 115-d (e.g., transmit power coverage), and thus estimate the signal strength that UE 115-c can use to calculate the SNR associated with the interfering radar, and infer the uncertainty of the location of spurious peaks in the spectrum.

[0102] At 440, based on the location of spurious peaks in the identified spectrum, UE 115-c can attenuate frequency data to suppress or eliminate spurious peaks caused by interference from UE 115-d. For example, UE 115-c can identify spurious peaks and can set one or more data points associated with the spurious peak to zero, also known as setting them to empty. In some other examples, UE 115-d can set data points to random values ​​of the noise level associated with the received radar waveform, thus removing or attenuating spurious peaks. In some cases, UE 115-c can attenuate spurious peaks in other ways, making it easier to identify real peaks or real targets.

[0103] At 445, UE 115-d can generate a radar image based on a modified or attenuated spectrum. In some cases, a radar image can be generated based on a single spectrum, which may also be referred to as a 1D radar image. In other cases, a radar image can be generated based on two or more spectra (e.g., 2D range spectrum, 3D range spectrum, etc.), which have also been modified to identify spurious peaks. In some cases, generating a radar image using multiple modified spectra makes it easier to identify genuine peaks.

[0104] At 450, UE 115-c can identify target 405 based on the generated radar image. For example, the radar image can exclude false peaks caused by interference from UE 115-d, which allows UE 115-c to identify frequency peaks caused by FMCW radar reflected at 420, thereby identifying target 405.

[0105] Figure 5 A block diagram 500 of an apparatus 505 supporting coordinated interference clearance utilizing known interference location and timing, according to various aspects of this disclosure, is shown. Apparatus 505 may be an example of various aspects of a UE 115 as described herein. Apparatus 505 may include a receiver 510, a transmitter 515, and a communications manager 520. Apparatus 505 may also include a processor. Each of these components may be in communication with each other (e.g., via one or more buses).

[0106] Receiver 510 may provide means for receiving information, such as packets, user data, control information, or any combination thereof, associated with various information channels (e.g., control channels, data channels, information channels related to coordinated jamming clearance using known jammer locations and timings). The information may be transmitted to other components of device 505. Receiver 510 may utilize a single antenna or a collection of multiple antennas.

[0107] Transmitter 515 may provide means for transmitting signals generated by other components of device 505. For example, transmitter 515 may transmit information such as packets, user data, control information, or any combination thereof associated with various information channels (e.g., control channels, data channels, information channels related to coordinated jamming clearance utilizing known jammer locations and timings). In some examples, transmitter 515 may be co-located with receiver 510 in a transceiver module. Transmitter 515 may utilize a single antenna or a collection of multiple antennas.

[0108] The communication manager 520, receiver 510, transmitter 515, or various combinations thereof, or various components thereof, may be examples of means for performing various aspects of coordinated interference clearance utilizing known jammer locations and timings as described herein. For example, the communication manager 520, receiver 510, transmitter 515, or various combinations thereof, or components thereof, may support methods for performing one or more of the functions described herein.

[0109] In some examples, the communication manager 520, receiver 510, transmitter 515, or various combinations or components thereof may be implemented in hardware (e.g., in a communication management circuitry system). This hardware may include a processor, digital signal processor (DSP), application-specific integrated circuit (ASIC), field-programmable gate array (FPGA) or other programmable logic device, discrete gate or transistor logic, discrete hardware components, or any combination thereof, configured to serve as or otherwise support means for performing the functions described herein. In some examples, the processor and memory coupled to the processor may be configured to perform one or more of the functions described herein (e.g., by executing instructions stored in memory by the processor).

[0110] Additionally or alternatively, in some examples, the communication manager 520, receiver 510, transmitter 515, or various combinations or components thereof may be implemented by code executed by a processor (e.g., as communication management software or firmware). If implemented by code executed by a processor, the functionality of the communication manager 520, receiver 510, transmitter 515, or various combinations or components thereof may be performed by a general-purpose processor, DSP, central processing unit (CPU), ASIC, FPGA, or any combination of these or other programmable logic devices (e.g., means configured or otherwise supported for performing the functions described in this disclosure).

[0111] In some examples, the communication manager 520 may be configured to use or otherwise cooperate with the receiver 510, transmitter 515, or both to perform various operations (e.g., receiving, monitoring, transmitting). For example, the communication manager 520 may receive information from the receiver 510, send information to the transmitter 515, or be integrated with the receiver 510, transmitter 515, or both to receive information, transmit information, or perform various other operations described herein.

[0112] For example, the communication manager 520 may be configured or otherwise supported to support means for receiving indications of the location of the second UE and indications of one or more parameters associated with radar transmissions from the second UE. The communication manager 520 may be configured or otherwise supported to support means for receiving a radio frequency waveform including a first component associated with radar transmissions from the second UE and a second component associated with reflected radar transmissions from the first UE. The communication manager 520 may be configured or otherwise supported to support means for compensating for interference from the first component of the received radio frequency waveform based on the location of the second UE and the one or more parameters associated with radar transmissions from the second UE. The communication manager 520 may be configured or otherwise supported to support means for generating a radar image from the received radio frequency waveform based on compensation for interference from the first component of the received radio frequency waveform.

[0113] By including or configuring a communication manager 520 according to an example as described herein, device 505 (e.g., a processor that controls or otherwise couples to receiver 510, transmitter 515, communication manager 520, or a combination thereof) can support techniques for enhanced target detection. One implementation may allow UE 115 to save power and increase battery life by efficiently detecting interference associated with one or more interfering parties, UE 115. Another implementation may provide improved quality of service and reliability at UE 115 because targets can be more easily identified via receiver-side link indication.

[0114] Figure 6 A block diagram 600 of an apparatus 605 supporting coordinated interference clearance utilizing known interference location and timing, according to various aspects of this disclosure, is shown. Apparatus 605 may be an example of aspects of apparatus 505 or UE 115 as described herein. Apparatus 605 may include a receiver 610, a transmitter 615, and a communications manager 620. Apparatus 605 may also include a processor. Each of these components may be in communication with each other (e.g., via one or more buses).

[0115] Receiver 610 may provide means for receiving information, such as packets, user data, control information, or any combination thereof, associated with various information channels (e.g., control channels, data channels, information channels related to coordinated jamming clearance using known jammer locations and timings). The information may be transmitted to other components of device 605. Receiver 610 may utilize a single antenna or a collection of multiple antennas.

[0116] Transmitter 615 may provide means for transmitting signals generated by other components of device 605. For example, transmitter 615 may transmit information such as packets, user data, control information, or any combination thereof associated with various information channels (e.g., control channels, data channels, information channels related to coordinated jamming clearance utilizing known jammer locations and timings). In some examples, transmitter 615 may be co-located with receiver 610 in a transceiver module. Transmitter 615 may utilize a single antenna or a collection of multiple antennas.

[0117] Device 605 or its various components may be examples of means for performing various aspects of coordinated jamming clearance using known jammer locations and timings as described herein. For example, communication manager 620 may include sidelink communication manager 625, radar detection component 630, jamming manager 635, radar image generator 640, or any combination thereof. Communication manager 620 may be examples of various aspects of communication manager 520 as described herein. In some examples, communication manager 620 or its various components may be configured to perform various operations (e.g., receiving, monitoring, transmitting) using receiver 610, transmitter 615, or both, or otherwise in cooperation with receiver 610, transmitter 615, or both. For example, communication manager 620 may receive information from receiver 610, send information to transmitter 615, or be integrated in combination with receiver 610, transmitter 615, or both to receive information, transmit information, or perform various other operations described herein.

[0118] The sidelink communication manager 625 may be configured or otherwise supported to support means for receiving indications of the location of the second UE and indications of one or more parameters associated with radar transmissions from the second UE. The radar detection component 630 may be configured or otherwise supported to support means for receiving a radio frequency waveform including a first component associated with radar transmissions from the second UE and a second component associated with reflected radar transmissions from the first UE. The interference manager 635 may be configured or otherwise supported to support means for compensating for interference from the first component of the received radio frequency waveform based on the location of the second UE and the one or more parameters associated with radar transmissions from the second UE. The radar image generator 640 may be configured or otherwise supported to support means for generating a radar image from the received radio frequency waveform based on compensation for interference from the first component of the received radio frequency waveform.

[0119] Figure 7 A block diagram 700 of a communication manager 720 supporting coordinated jamming clearance utilizing known jammer locations and timings, according to various aspects of this disclosure, is shown. The communication manager 720 may be an example of the communication manager 520, communication manager 620, or aspects thereof described herein. The communication manager 720 or its various components may be examples of means for performing various aspects of coordinated jamming clearance utilizing known jammer locations and timings as described herein. For example, the communication manager 720 may include a sidelink communication manager 725, a radar detection component 730, a jamming manager 735, a radar image generator 740, a spectrum generator 745, a target detection manager 750, or any combination thereof. Each of these components may communicate directly or indirectly with each other (e.g., via one or more buses).

[0120] The sidelink communication manager 725 may be configured or otherwise supported to support means for receiving indications of the location of the second UE and indications of one or more parameters associated with radar transmissions from the second UE. The radar detection component 730 may be configured or otherwise supported to support means for receiving a radio frequency waveform including a first component associated with radar transmissions from the second UE and a second component associated with reflected radar transmissions from the first UE. The interference manager 735 may be configured or otherwise supported to support means for compensating for interference from the first component of the received radio frequency waveform based on the location of the second UE and the one or more parameters associated with radar transmissions from the second UE. The radar image generator 740 may be configured or otherwise supported to support means for generating a radar image from the received radio frequency waveform based on compensation for interference from the first component of the received radio frequency waveform.

[0121] In some examples, to support interference compensation, the spectrum generator 745 may be configured or otherwise supported to provide means for generating a spectrum based on a received radio frequency waveform. In some examples, to support interference compensation, the interference manager 735 may be configured or otherwise supported to provide means for identifying portions of the spectrum that include interference from a first component of the received radio frequency waveform, based on the location of the second UE and one or more parameters associated with radar transmissions from the second UE. In some examples, to support interference compensation, the interference manager 735 may be configured or otherwise supported to provide means for removing the identified portions from the spectrum.

[0122] In some examples, removing the identified portion from the spectrum includes setting the identified portion of the spectrum to null.

[0123] In some examples, setting the identified portion of the spectrum to empty includes setting the value of the identified portion of the spectrum to zero.

[0124] In some examples, setting the identified portion of the spectrum to empty includes setting the value of the identified portion of the spectrum to a random variable based on the noise level of the spectrum.

[0125] In some examples, the spectrum includes the Doppler spectrum, the direction-of-arrival spectrum, the range spectrum, or a combination thereof.

[0126] In some examples, the target detection manager 750 may be configured or otherwise supported as means for identifying targets based on compensation for interference associated with radar transmissions from a second UE.

[0127] In some examples, the reflected radar transmission from the first UE is reflected from the target.

[0128] In some examples, indications of the location of the second UE and indications of one or more parameters associated with radar transmissions from the second UE may be received via a sidelink channel.

[0129] In some examples, the indication of the location of the second UE includes GPS signaling from the second UE, explicit indication of location from the second UE, indication of the timing of synchronization transmission between the first UE and the second UE, or a combination thereof.

[0130] In some examples, one or more parameters associated with radar transmissions from a second UE include one or more of the following: the frequency ramp direction of the frequency-modulated continuous wave, the starting frequency of the frequency-modulated continuous wave, the transmission start time of the frequency-modulated continuous wave, or the duration of each pulse of the frequency-modulated continuous wave.

[0131] In some examples, this parameter indicates the speed of the second UE or the direction of arrival of the second UE.

[0132] In some examples, the side link manager 725 can be configured or otherwise supported for transmitting frequency-modulated continuous waves including several frequency sweep chirps.

[0133] In some examples, the reflected radar transmission from the first UE includes reflections of several frequency sweep chirps.

[0134] Figure 8 A diagram of a system 800 including device 805 supporting coordinated interference clearance utilizing known interfering party locations and timings, according to various aspects of this disclosure, is shown. Device 805 may be an example of device 505, device 605, or UE 115 as described herein, or a component including device 505, device 605, or UE 115. Device 805 may wirelessly communicate with one or more base stations 105, UE 115, or any combination thereof. Device 805 may include components for bidirectional voice and data communication, including components for transmitting and receiving communications, including a communication manager 820, an input / output (I / O) controller 810, a transceiver 815, an antenna 825, a memory 830, a code 835, and a processor 840. These components may be in electronic communication or otherwise coupled (e.g., operational ground, communication ground, functional ground, electronic ground, electrical ground) via one or more buses (e.g., bus 845).

[0135] I / O controller 810 manages the input and output signals of device 805. I / O controller 810 can also manage peripheral devices not integrated into device 805. In some cases, I / O controller 810 may represent a physical connection or port to an external peripheral device. In some cases, I / O controller 810 may utilize an operating system such as iOS®, ANDROID®, MS-DOS®, MS-WINDOWS®, OS / 2®, UNIX®, LINUX®, or another known operating system. Additionally or alternatively, I / O controller 810 may represent or interact with a modem, keyboard, mouse, touchscreen, or similar device. In some cases, I / O controller 810 may be implemented as part of a processor (such as processor 840). In some cases, a user may interact with device 805 via I / O controller 810 or via hardware components controlled by I / O controller 810.

[0136] In some cases, device 805 may include a single antenna 825. However, in other cases, device 805 may have more than one antenna 825, which may be capable of transmitting or receiving multiple wireless transmissions concurrently. Transceiver 815 may communicate bidirectionally via one or more antennas 825, wired or wireless links, as described herein. For example, transceiver 815 may represent a wireless transceiver and be capable of bidirectional communication with another wireless transceiver. Transceiver 815 may also include a modem for modulating packets and providing modulated packets to one or more antennas 825 for transmission, and for demodulating packets received from one or more antennas 825. Transceiver 815, or transceiver 815 and one or more antennas 825, may be an example of transmitter 515, transmitter 615, receiver 510, receiver 610, or any combination thereof or components thereof as described herein.

[0137] Memory 830 may include random access memory (RAM) and read-only memory (ROM). Memory 830 may store computer-readable, computer-executable code 835, including instructions that, when executed by processor 840, cause device 805 to perform the various functions described herein. Code 835 may be stored in a non-transitory computer-readable medium, such as system memory or other types of memory. In some cases, code 835 may not be directly executed by processor 840, but may cause a computer (e.g., when compiled and executed) to perform the functions described herein. In some cases, memory 830 may, in particular, include a basic I / O system (BIOS) that controls basic hardware or software operations, such as interaction with peripheral components or devices.

[0138] Processor 840 may include intelligent hardware devices (e.g., general-purpose processors, DSPs, CPUs, microcontrollers, ASICs, FPGAs, programmable logic devices, discrete gate or transistor logic components, discrete hardware components, or any combination thereof). In some cases, processor 840 may be configured to use a memory controller to operate a memory array. In other cases, the memory controller may be integrated into processor 840. Processor 840 may be configured to execute computer-readable instructions stored in memory (e.g., memory 830) to cause device 805 to perform various functions (e.g., functions or tasks supporting coordinated interference clearance utilizing known interference location and timing). For example, device 805 or components thereof may include processor 840 and memory 830 coupled to processor 840, wherein processor 840 and memory 830 are configured to perform the various functions described herein.

[0139] For example, the communication manager 820 may be configured or otherwise supported to support means for receiving indications of the location of the second UE and indications of one or more parameters associated with radar transmissions from the second UE. The communication manager 820 may be configured or otherwise supported to support means for receiving a radio frequency waveform including a first component associated with radar transmissions from the second UE and a second component associated with reflected radar transmissions from the first UE. The communication manager 820 may be configured or otherwise supported to support means for compensating for interference from the first component of the received radio frequency waveform based on the location of the second UE and the one or more parameters associated with radar transmissions from the second UE. The communication manager 820 may be configured or otherwise supported to support means for generating a radar image from the received radio frequency waveform based on compensation for interference from the first component of the received radio frequency waveform.

[0140] By including or configuring a communication manager 820 according to an example as described herein, device 805 can support techniques for improved inter-device coordination. Based on received indications of the location of the second UE and indications of one or more parameters associated with radar transmissions from the second UE, processor 840 can efficiently identify one or more portions of the spectrum that include interference from received radio frequency waveforms. The processor of UE 115 can activate one or more processing units for receiving these indications, speed up the processing clock, or similar mechanisms within UE 115. Thus, when these indications are received, processor 840 can be prepared to respond more efficiently by reducing the ramp-up of processing power.

[0141] In some examples, the communication manager 820 may be configured to perform various operations (e.g., receiving, monitoring, transmitting) using or otherwise cooperating with transceiver 815, one or more antennas 825, or any combination thereof. Although the communication manager 820 is described as a separate component, in some examples, one or more functions described with reference to the communication manager 820 may be supported or performed by processor 840, memory 830, code 835, or any combination thereof. For example, code 835 may include instructions that can be executed by processor 840 to cause device 805 to perform aspects of coordinated interference clearance utilizing known interfering party locations and timings as described herein, or the processor 840 and memory 830 may be otherwise configured to perform or support such operations.

[0142] Figure 9 A flowchart illustrating a coordinated interference clearance method 900 utilizing known interference locations and timings, according to various aspects of this disclosure, is shown. Operation of method 900 can be implemented by a UE or its components as described herein. For example, operation of method 900 can be achieved by referring to... Figures 1 to 8 The UE 115 described herein is used to perform this function. In some examples, the UE can execute a set of instructions to control the functional elements of the UE to perform the described function. Additionally or alternatively, the UE may use dedicated hardware to perform aspects of the described function.

[0143] At 905, the method may include receiving an indication of the location of the second UE and an indication of one or more parameters associated with radar transmissions from the second UE. Operation of 905 may be performed according to the examples disclosed herein. In some examples, aspects of the operation of 905 may be provided by reference to... Figure 7 The sidelink communication manager 725 described is used to perform this.

[0144] At 910, the method can receive a radio frequency waveform including a first component associated with radar transmission from the second UE and a second component associated with reflective radar transmission from the first UE. Operation of 910 can be performed according to the examples disclosed herein. In some examples, aspects of the operation of 910 can be determined by reference to... Figure 7 The radar detection component described is used to perform this.

[0145] At 915, the method may include compensating for interference from a first component of the received radio frequency waveform based on the location of the second UE and one or more parameters associated with radar transmissions from the second UE. Operation of 915 may be performed according to the examples disclosed herein. In some examples, aspects of operation of 915 may be determined by reference to... Figure 7The described interference manager 735 is used to execute this.

[0146] At 920, the method may include generating a radar image from the received radio frequency waveform based on compensation for interference from a first component of the received radio frequency waveform. The operation of 920 may be performed according to the examples disclosed herein. In some examples, aspects of the operation of 920 may be provided by reference to... Figure 7 The radar image generator 740 described herein is used to perform this action.

[0147] Figure 10 A flowchart illustrating a coordinated interference clearance method 1000 utilizing known interference location and timing, according to various aspects of this disclosure, is shown. The operation of method 1000 can be implemented by a UE or its components as described herein. For example, the operation of method 1000 can be implemented by, as described in reference... Figures 1 to 8 The UE 115 described herein is used to perform this function. In some examples, the UE can execute a set of instructions to control the functional elements of the UE to perform the described function. Additionally or alternatively, the UE may use dedicated hardware to perform aspects of the described function.

[0148] At point 1005, the method may include receiving an indication of the location of the second UE and an indication of one or more parameters associated with radar transmissions from the second UE. Operation of point 1005 may be performed according to the examples disclosed herein. In some examples, aspects of the operation of point 1005 may be provided by reference to... Figure 7 The sidelink communication manager 725 described is used to perform this.

[0149] At 1010, the method can receive a radio frequency waveform including a first component associated with radar transmission from the second UE and a second component associated with reflective radar transmission from the first UE. The operation of 1010 can be performed according to the examples disclosed herein. In some examples, aspects of the operation of 1010 can be determined by reference to... Figure 7 The radar detection component described is used to perform this.

[0150] At point 1015, the method may include generating a spectrum based on the received radio frequency waveform. The operation of point 1015 may be performed according to the examples disclosed herein. In some examples, aspects of the operation of point 1015 may be derived from, as referenced... Figure 7 The spectrum generator 745 described is used to perform this.

[0151] At 1020, the method may include identifying a portion of the spectrum containing interference from a first component of the received radio frequency waveform based on the location of the second UE and one or more parameters associated with radar transmissions from the second UE. Operation of 1020 may be performed according to the examples disclosed herein. In some examples, aspects of the operation of 1020 may be determined by reference to... Figure 7 The described interference manager 735 is used to execute this.

[0152] At 1025, the method may include removing the identified portion from the spectrum. The operation at 1025 may be performed according to the examples disclosed herein. In some examples, aspects of the operation at 1025 may be derived from, as referenced... Figure 7 The described interference manager 735 is used to execute this.

[0153] At 1030, the method may include generating a radar image from the received radio frequency waveform based on compensation for interference from a first component of the received radio frequency waveform. The operation of 1030 may be performed according to the examples disclosed herein. In some examples, aspects of the operation of 1030 may be provided by reference to... Figure 7 The radar image generator 740 described herein is used to perform this action.

[0154] Figure 11 A flowchart illustrating a coordinated interference clearance method 1100 utilizing known interference locations and timings, according to various aspects of this disclosure, is shown. Operation of method 1100 can be implemented by a UE or its components as described herein. For example, operation of method 1100 can be implemented by, as described in reference... Figures 1 to 8 The UE 115 described herein is used to perform this function. In some examples, the UE can execute a set of instructions to control the functional elements of the UE to perform the described function. Additionally or alternatively, the UE may use dedicated hardware to perform aspects of the described function.

[0155] At 1105, the method may include receiving an indication of the location of the second UE and an indication of one or more parameters associated with radar transmissions from the second UE. Operation of 1105 may be performed according to the examples disclosed herein. In some examples, aspects of the operation of 1105 may be provided by reference to... Figure 7 The sidelink communication manager 725 described is used to perform this.

[0156] At 1110, the method can receive a radio frequency waveform including a first component associated with radar transmission from the second UE and a second component associated with reflective radar transmission from the first UE. Operation of 1110 can be performed according to the examples disclosed herein. In some examples, aspects of the operation of 1110 can be derived from, as referenced... Figure 7 The radar detection component 730 described herein performs this function.

[0157] At 1115, the method may include compensating for interference from a first component of the received radio frequency waveform based on the location of the second UE and one or more parameters associated with radar transmissions from the second UE. Operation of 1115 may be performed according to the examples disclosed herein. In some examples, aspects of operation of 1115 may be determined by reference to... Figure 7 The described interference manager 735 is used to execute this.

[0158] At 1120, the method may include generating a radar image from the received radio frequency waveform based on compensation for interference from a first component of the received radio frequency waveform. The operation of 1120 may be performed according to the examples disclosed herein. In some examples, aspects of the operation of 1120 may be provided by reference to... Figure 7 The radar image generator 740 described herein is used to perform this action.

[0159] At 1125, the method may include transmitting a frequency-modulated continuous wave comprising several frequency sweep chirps. The operation of 1125 may be performed according to the examples disclosed herein. In some examples, aspects of the operation of 1125 may be provided as referenced. Figure 7 The sidelink communication manager 725 described is used to perform this.

[0160] The following provides an overview of the various aspects of this disclosure: Aspect 1: A method for wireless communication at a first UE, comprising: receiving an indication of the location of a second UE and an indication of one or more parameters associated with radar transmissions from the second UE; receiving a radio frequency waveform including a first component associated with radar transmissions from the second UE and a second component associated with reflected radar transmissions from the first UE; compensating for interference from the first component of the received radio frequency waveform based at least in part on the location of the second UE and the one or more parameters associated with radar transmissions from the second UE; and generating a radar image from the received radio frequency waveform based at least in part on the compensation for interference from the first component of the received radio frequency waveform.

[0161] Aspect 2: The method of Aspect 1, wherein interference compensation further comprises: generating a spectrum at least in part based on a received radio frequency waveform; identifying a portion of the spectrum that includes interference from a first component of the received radio frequency waveform based at least in part on the location of the second UE and one or more parameters associated with radar transmissions from the second UE; and removing the identified portion from the spectrum.

[0162] Aspect 3: The method of aspect 2, wherein removing the identified portion from the spectrum includes setting the identified portion of the spectrum to empty.

[0163] Aspect 4: The method of aspect 3, wherein setting the identified portion of the spectrum to empty includes setting the value of the identified portion of the spectrum to zero.

[0164] Aspect 5: The method of aspects 3 to 4, wherein setting the identified portion of the spectrum to empty includes setting the value of the identified portion of the spectrum to a random variable based on the noise level of the spectrum.

[0165] Aspect 6: The method of any of Aspects 2 to 5, wherein the spectrum includes the Doppler spectrum, the direction-of-arrival spectrum, the range spectrum, or a combination thereof.

[0166] Aspect 7: The method of any of Aspects 1 to 6 further includes: identifying the target based at least in part on compensation for interference associated with radar transmissions from the second UE.

[0167] Aspect 8: The method of aspect 7, wherein the reflection radar transmission from the first UE is reflected from the target.

[0168] Aspect 9: The method of any of Aspects 1 to 8, wherein an indication of the location of the second UE and an indication of one or more parameters associated with radar transmissions from the second UE can be received via a side link channel.

[0169] Aspect 10: The method of any of Aspects 1 to 9, wherein the indication of the location of the second UE includes GPS signaling from the second UE, an explicit indication of the location from the second UE, an indication of the timing of a synchronous transmission between the first UE and the second UE, or a combination thereof.

[0170] Aspect 11: The method of any of Aspects 1 to 10, wherein the radar transmission from the second UE comprises a frequency-modulated continuous wave, and one or more parameters associated with the radar transmission from the second user equipment include one or more of the following: the frequency ramp direction of the frequency-modulated continuous wave, the starting frequency of the frequency-modulated continuous wave, the transmission start time of the frequency-modulated continuous wave, or the duration of each pulse of the frequency-modulated continuous wave.

[0171] Aspect 12: The method of aspect 11, wherein the one or more parameters indicate the speed of the second UE or the direction of arrival of the second UE.

[0172] Aspect 13: The method of any of Aspects 1 to 12 further includes: transmitting a frequency-modulated continuous wave comprising a plurality of frequency sweep chirps.

[0173] Aspect 14: The method of aspect 13, wherein the reflected radar transmission from the first UE includes reflections of the several frequency sweep chirps.

[0174] Aspect 15: An apparatus comprising: a processor; a memory coupled to the processor; and instructions stored in the memory and executable by the processor to cause the apparatus to perform a method as described in any of Aspects 1 to 14.

[0175] Aspect 16: An apparatus comprising at least one means for performing the method as described in any one of Aspects 1 to 14.

[0176] Aspect 17: A non-transient computer-readable medium storing code including instructions executable by a processor to perform methods as described in any of Aspects 1 to 14.

[0177] It should be noted that the methods described in this paper describe possible implementations, and the operations and steps can be rearranged or otherwise modified, and other implementations are also possible. Furthermore, aspects from two or more methods can be combined.

[0178] While aspects of LTE, LTE-A, LTE-A Pro, or NR systems may be described for illustrative purposes, and the terms LTE, LTE-A, LTE-A Pro, or NR may be used in most of the description, the techniques described herein can also be applied to networks other than LTE, LTE-A, LTE-A Pro, or NR networks. For example, the techniques described can be applied to a variety of other wireless communication systems, such as Ultra Mobile Broadband (UMB), IEEE 802.11 (Wi-Fi), IEEE 802.16 (WiMAX), IEEE 802.20, Flash-OFDM, and other systems and radio technologies not explicitly mentioned herein.

[0179] The information and signals described herein can be represented using any of a wide variety of different techniques and methods. For example, data, instructions, commands, information, signals, bits, symbols, and chips that may be referred to throughout this description can be represented by voltage, current, electromagnetic waves, magnetic fields or magnetic particles, light fields or light particles, or any combination thereof.

[0180] The various illustrative boxes and components described herein can be implemented or executed using a general-purpose processor, DSP, ASIC, CPU, FPGA or other programmable logic device, discrete gate or transistor logic, discrete hardware components, or any combination thereof designed to perform the functions described herein. The general-purpose processor may be a microprocessor, but in alternatives, the processor may be any processor, controller, microcontroller, or state machine. The processor may also be implemented as a combination of computing devices (e.g., a combination of a DSP and a microprocessor, multiple microprocessors, one or more microprocessors working in conjunction with a DSP core, or any other such configuration).

[0181] The functions described herein may be implemented in hardware, software executed by a processor, firmware, or any combination thereof. If implemented in software executed by a processor, the functions may be stored or transmitted as one or more instructions or code on a computer-readable medium. Other examples and implementations fall within the scope of this disclosure and the appended claims. For example, due to the nature of software, the functions described herein may be implemented using software executed by a processor, hardware, firmware, hardwired, or any combination thereof. Features implementing the functions may also be physically located in various locations, including being distributed such that different parts of the function are implemented at different physical locations.

[0182] Computer-readable media includes both non-transitory computer storage media and communication media, encompassing any medium that facilitates the transfer of a computer program from one location to another. Non-transitory storage media can be any available medium accessible to a general-purpose or special-purpose computer. By way of example and not limitation, non-transitory computer-readable media may include RAM, ROM, electrically erasable programmable ROM (EEPROM), flash memory, compact disc (CD) ROM or other optical disc storage, magnetic disk storage or other magnetic storage devices, or any other non-transitory medium that can be used to carry or store desired program code in the form of instructions or data structures and is accessible to a general-purpose or special-purpose computer, or a general-purpose or special-purpose processor. Similarly, any connection is also legitimately referred to as computer-readable media. For example, if software is transmitted from a website, server, or other remote source using coaxial cable, fiber optic cable, twisted pair, digital subscriber line (DSL), or wireless technologies such as infrared, radio, and microwave, then such coaxial cable, fiber optic cable, twisted pair, DSL, or wireless technologies such as infrared, radio, and microwave are included in the definition of computer-readable media. As used in this article, disk and disc include CDs, laser discs, optical discs, DVDs, floppy disks, and Blu-ray discs, where disks often magnetically reproduce data while discs optically reproduce data using lasers. Combinations of these media are also included within the scope of computer-readable media.

[0183] As used herein (including in the claims), the word "or" in an enumeration of items (e.g., an enumeration of items accompanied by phrases such as "at least one of" or "one or more of") indicates an inclusive enumeration, such that an enumeration of at least one of, for example, A, B, or C means A or B or C or AB or AC or BC or ABC (i.e., A and B and C). Similarly, as used herein, the phrase "based on" should not be interpreted as referring to a closed set of conditions. For example, an example step described as "based on condition A" may be based on both condition A and condition B without departing from the scope of this disclosure. In other words, as used herein, the phrase "based on" should be interpreted in the same manner as the phrase "at least partially based on".

[0184] In the accompanying drawings, similar components or features may have the same reference numerals. Furthermore, components of the same type may be distinguished by a dash following the reference numeral and a second reference numeral used to differentiate between similar components. If only the first reference numeral is used in the description, the description may apply to any of the similar components having the same first reference numeral, regardless of the second reference numeral or other subsequent reference numerals.

[0185] The descriptions herein, illustrated with reference to the accompanying drawings, depict exemplary configurations and are not representative of all examples that may be implemented or fall within the scope of the claims. The term "example" as used herein means "serving as an example, instance, or illustration" and does not imply "superior" or "outperforming" other examples. This detailed description includes specific details to provide an understanding of the described techniques. However, these techniques may be practiced without these specific details. In some instances, known structures and devices are shown in block diagram form to avoid obscuring the concepts of the described examples.

[0186] The description provided herein is intended to enable those skilled in the art to make or use this disclosure. Various modifications to this disclosure will be apparent to those skilled in the art, and the universal principles defined herein can be applied to other variations without departing from the scope of this disclosure. Therefore, this disclosure is not limited to the examples and designs described herein, but should be granted the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A method for wireless communication at a first user equipment (UE), comprising: Receive indication of the location of the second UE and indication of one or more parameters associated with radar transmissions from the second UE; Receive radio frequency waveforms, the radio frequency waveforms including a first component associated with the radar transmission from the second UE and a second component associated with the reflected radar transmission from the first UE; The interference from the first component of the received radio frequency waveform is compensated at least in part based on the location of the second UE and one or more parameters associated with the radar transmission from the second UE, wherein compensating for the interference further includes: The spectrum is generated at least in part based on the received radio frequency waveform; The portion of the spectrum comprising the interference from the first component of the received radio frequency waveform is identified, at least in part, based on the location of the second UE and one or more parameters associated with the radar transmission from the second UE; and Remove the identified portion from the spectrum; and The radar image is generated from the received radio frequency waveform based at least in part on the interference from the first component of the received radio frequency waveform, which is compensated for.

2. The method of claim 1, wherein removing the identified portion from the spectrum comprises setting the identified portion of the spectrum to empty.

3. The method of claim 2, wherein setting the identified portion of the spectrum to empty comprises setting the value of the identified portion of the spectrum to zero.

4. The method of claim 2, wherein setting the identified portion of the spectrum to empty comprises setting the value of the identified portion of the spectrum to a random variable based on the noise level of the spectrum.

5. The method of claim 1, wherein the spectrum comprises a Doppler spectrum, a direction-of-arrival spectrum, a range spectrum, or a combination thereof.

6. The method of claim 1, further comprising: The target is identified at least in part based on compensation for the interference associated with the radar transmission from the second UE.

7. The method of claim 6, wherein the reflected radar transmission from the first UE is reflected from the target.

8. The method of claim 1, wherein the indication of the location of the second UE and the indication of the one or more parameters associated with the radar transmission from the second UE are received via a sidelink channel.

9. The method of claim 1, wherein the indication of the location of the second UE comprises GPS signaling from the second UE, an explicit indication of the location from the second UE, an indication of the timing of a synchronization transmission between the first UE and the second UE, or a combination thereof.

10. The method of claim 1, wherein the radar transmission from the second UE comprises a frequency-modulated continuous wave, and wherein the one or more parameters associated with the radar transmission from the second UE include one or more of the following: the frequency ramp direction of the frequency-modulated continuous wave, the start frequency of the frequency-modulated continuous wave, the transmission start time of the frequency-modulated continuous wave, or the duration of each pulse of the frequency-modulated continuous wave.

11. The method of claim 10, wherein one or more parameters indicate the speed of the second UE or the direction of arrival of the second UE.

12. The method of claim 1, further comprising: The transmission consists of frequency-modulated continuous waves with sweeping chirps at several frequencies.

13. The method of claim 12, wherein the reflection radar transmission from the first UE includes reflections of the plurality of frequency sweep chirps.

14. An apparatus for performing wireless communication at a first user equipment (UE), comprising: processor; Memory coupled to the processor; as well as Instructions stored in the memory and executable by the processor to cause the device to perform the following operations: Receive indication of the location of the second UE and indication of one or more parameters associated with radar transmissions from the second UE; Receive radio frequency waveforms, the radio frequency waveforms including a first component associated with the radar transmission from the second UE and a second component associated with the reflected radar transmission from the first UE; The interference from the first component of the received radio frequency waveform is compensated at least in part based on the location of the second UE and one or more parameters associated with the radar transmission from the second UE, wherein instructions for compensating for the interference can be further executed by the processor to enable the device to: The spectrum is generated at least in part based on the received radio frequency waveform; The portion of the spectrum that includes the first component of the received radio frequency waveform is identified, at least in part, based on the location of the second UE and one or more parameters associated with the radar transmission from the second UE; as well as Remove the identified portion from the spectrum; as well as The radar image is generated from the received radio frequency waveform based at least in part on the interference from the first component of the received radio frequency waveform, which is compensated for.

15. The apparatus of claim 14, wherein removing the identified portion from the spectrum comprises emptying the identified portion of the spectrum.

16. The apparatus of claim 15, wherein setting the identified portion of the spectrum to empty comprises setting the value of the identified portion of the spectrum to zero.

17. The apparatus of claim 15, wherein setting the identified portion of the spectrum to empty comprises setting the value of the identified portion of the spectrum to a random variable based on the noise level of the spectrum.

18. The apparatus of claim 14, wherein the spectrum comprises a Doppler spectrum, a direction-of-arrival spectrum, a distance spectrum, or a combination thereof.

19. The apparatus of claim 14, wherein the instructions are further executable by the processor to cause the apparatus to: The target is identified at least in part based on compensation for the interference associated with the radar transmission from the second UE.

20. The apparatus of claim 19, wherein the reflected radar transmission from the first UE is reflected from the target.

21. The apparatus of claim 14, wherein the indication of the location of the second UE and the indication of one or more parameters associated with the radar transmission from the second UE are received via a sidelink channel.

22. The apparatus of claim 14, wherein the indication of the location of the second UE comprises GPS signaling from the second UE, an explicit indication of the location from the second UE, an indication of the timing of a synchronization transmission between the first UE and the second UE, or a combination thereof.

23. The apparatus of claim 14, wherein the radar transmission from the second UE comprises a frequency-modulated continuous wave, and wherein the one or more parameters associated with the radar transmission from the second UE include one or more of the following: the frequency ramp direction of the frequency-modulated continuous wave, the start frequency of the frequency-modulated continuous wave, the transmission start time of the frequency-modulated continuous wave, or the duration of each pulse of the frequency-modulated continuous wave.

24. The apparatus of claim 23, wherein one or more parameters indicate the speed of the second UE or the direction of arrival of the second UE.

25. The apparatus of claim 14, wherein the instructions are further executable by the processor to cause the apparatus to: The transmission consists of frequency-modulated continuous waves with sweeping chirps at several frequencies.

26. The apparatus of claim 25, wherein the reflection radar transmission from the first UE comprises reflections of the plurality of frequency sweep chirps.

27. An apparatus for performing wireless communication at a first user equipment (UE), comprising: A means for receiving an indication of the location of a second UE and an indication of one or more parameters associated with radar transmissions from the second UE; A means for receiving a radio frequency waveform, the radio frequency waveform including a first component associated with the radar transmission from the second UE and a second component associated with the reflected radar transmission from the first UE; A means for compensating for interference from the first component of a received radio frequency waveform based at least in part on the location of the second UE and one or more parameters associated with the radar transmission from the second UE, wherein the means for compensating for the interference further comprises: A means for generating a spectrum based at least in part on a received radio frequency waveform; Means for identifying a portion of the spectrum comprising the interference from the first component of a received radio frequency waveform, based at least in part on the location of the second UE and one or more parameters associated with the radar transmission from the second UE; and A means for removing the identified portion from the spectrum; and A means for generating a radar image from a received radio frequency waveform based at least in part on compensation for the interference from the first component of the received radio frequency waveform.

28. A non-transient computer-readable medium storing code for use at a first user equipment (UE), the code comprising instructions executable by a processor for the following operations: Receive indication of the location of the second UE and indication of one or more parameters associated with radar transmissions from the second UE; Receive radio frequency waveforms, the radio frequency waveforms including a first component associated with the radar transmission from the second UE and a second component associated with the reflected radar transmission from the first UE; The interference from the first component of the received radio frequency waveform is compensated at least in part based on the location of the second UE and one or more parameters associated with the radar transmission from the second UE, including the code executable by the processor for compensating for the interference, comprising instructions executable by the processor for the following operations: The spectrum is generated at least in part based on the received radio frequency waveform; The portion of the spectrum that includes the first component of the received radio frequency waveform is identified, at least in part, based on the location of the second UE and one or more parameters associated with the radar transmission from the second UE; as well as Remove the identified portion from the spectrum; as well as The radar image is generated from the received radio frequency waveform based at least in part on the interference from the first component of the received radio frequency waveform, which is compensated for.

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