Inter-RT Interference Cancellation

Abstract

Systems, methods, and apparatus for wireless communications are described. The method may include an interference estimation process that measures, at a user equipment (UE), interference from a radio access technology (RAT) that is different from CV2X on a cellular vehicle-to-everything (CV2X) network. When a CV2X signal is not present during a last symbol of a subframe, the UE may record interference measurements on the CV2X network. The UE may then estimate the noise plus interference measured during the null symbols to improve noise plus interference whitening when decoding the subframe.

Description

[0001] Cross-references

[0002] This patent application claims the benefits of the following applications: U.S. Provisional Patent Application No. 62 / 857,370, entitled “Inter-Radio Access Technology Interference Cancellation,” filed by Landis et al. on June 5, 2019; and U.S. Patent Application No. 16 / 891,804, entitled “Inter-RadioAccess Technology Interference Cancellation,” filed by Landis et al. on June 3, 2020; each of the above applications is assigned to the assignee of this application. Technical Field

[0003] The following relates generally to wireless communications, and more particularly, to inter-radio access technology interference cancellation. Background Art

[0004] Wireless communication systems are widely deployed to provide various types of communication content such as voice, video, packet data, messaging, broadcasting, etc. These systems may be able to 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 (e.g., long term evolution (LTE) systems, improved LTE (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 may employ techniques 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 spread spectrum orthogonal frequency division multiplexing (DFT-S-OFDM). A wireless multiple access communication system may include multiple base stations or network access nodes, each of which simultaneously supports communication for multiple communication devices (which may be referred to as user equipment (UE)).

[0005] The wireless communication system may include or support a network for vehicle-based communications, also referred to as a vehicle-to-everything (V2X) network, a vehicle-to-vehicle (V2V) network, a cellular V2X (CV2X) network, or other similar networks. During CV2X communications, a UE may decode transmissions generated by a UE operating in the CV2X network. However, in some cases, transmissions from one or more radio access technologies (RATs) other than CV2X may interfere with transmissions in the CV2X network. Under these conditions, the CV2X transmissions may be degraded such that the receiving UE may not be able to correctly decode the CV2X transmissions. Summary of the invention

[0006] The described technology relates to improved methods, systems, devices and apparatuses for supporting interference cancellation between radio access technologies. In summary, the described technology provides an interference estimation process that efficiently measures interference from a radio access technology (RAT) different from cellular vehicle-to-everything (CV2X) (such as a wireless local area network (WLAN), which may also be referred to as WIFI or long-term evolution (LTE) herein). For example, when a CV2X signal is not transmitted, the UE may perform interference measurements. This may be during the last symbol of a subframe immediately preceding a subframe of interest. For example, the UE may assume that there is no CV2X signal in symbol 13 of a subframe and may detect WIFI interference in that symbol. The UE may then estimate the noise plus WIFI interference measured during symbol 13 to improve noise plus interference whitening in subsequent subframes. In some cases, this estimation and mitigation of interference may occur for each subframe. For example, the estimation may occur at symbol 13 of subframe n-1 and applied to subframe n, the estimation may occur at symbol 13 of subframe n and applied to subframe n+1, and so on. In addition, the UE may estimate LTE interference to improve decoding of subframe n. For example, the UE may buffer the first thirteen symbols of a subframe (e.g., symbols 0 to 12 of subframe n), and then measure and estimate LTE interference over the fourteenth symbol (e.g., symbol 13). The UE may then decode the stored symbols of subframe n based on the LTE interference measurement.

[0007] A method of wireless communication by a UE is described. The method may include: identifying, within a first transmission time interval (TTI), a symbol period in which a set of wireless devices operating according to a cellular vehicle-to-everything (CV2X) RAT are configured to avoid transmitting; measuring interference of a second RAT during the symbol period, the second RAT being different from the CV2X RAT; and decoding a CV2X waveform during the first TTI or a second TTI based on the measured interference.

[0008] An apparatus for wireless communication by a UE is described. The apparatus may include a processor, a memory coupled to the processor, and instructions stored in the memory. The instructions may be executable by the processor to cause the apparatus to perform the following operations: identifying, within a first TTI, a symbol period in which a set of wireless devices operating according to a cellular vehicle-to-everything (CV2X) RAT are configured to avoid transmitting; measuring interference of a second RAT during the symbol period, the second RAT being different from the CV2X RAT; and decoding a CV2X waveform during the first TTI or a second TTI based on the measured interference.

[0009] Another apparatus for wireless communication by a UE is described. The apparatus may include means for identifying, within a first TTI, symbol periods in which a set of wireless devices operating according to a cellular vehicle-to-everything (CV2X) RAT are configured to avoid transmitting; measuring interference of a second RAT during the symbol periods, the second RAT being different from the CV2X RAT; and decoding a CV2X waveform during the first TTI or a second TTI based on the measured interference.

[0010] A non-transitory computer-readable medium storing code for wireless communication by a UE is described. The code may include instructions executable by a processor to: identify, within a first TTI, a symbol period in which a set of wireless devices operating according to a cellular vehicle-to-everything (CV2X) RAT are configured to avoid transmitting; measure interference of a second RAT during the symbol period, the second RAT being different from the CV2X RAT; and decode a CV2X waveform during the first TTI or a second TTI based on the measured interference.

[0011] In some examples of the methods, apparatus, and non-transitory computer-readable media described herein, identifying the symbol period may include operations, features, units, or instructions for performing the following: identifying pre-configured or received control signaling that configures the UE to avoid transmitting during the symbol period.

[0012] In some examples of the methods, apparatus, and non-transitory computer-readable media described herein, identifying the symbol period may include operations, features, units, or instructions for performing each of the following: identifying that the symbol period may be the last symbol period of the first TTI, and the first TTI includes a set of symbol periods.

[0013] In some examples of the methods, apparatus, and non-transitory computer-readable media described herein, measuring the interference may include operations, features, units, or instructions for performing: generating an interference measurement set for the symbol period using the antenna set of the UE; and generating a covariance interference metric based on the interference measurement set, wherein the CV2X waveform may be decoded based on the covariance interference metric.

[0014] Some examples of the methods, apparatus, and non-transitory computer-readable media described herein may also include operations, features, units, or instructions for performing the following: buffering samples of a CV2X waveform generated for a set of symbol periods in the first TTI that occur before the symbol period within the first TTI, wherein the CV2X waveform may be received during the first TTI and decoded based on the buffered samples.

[0015] In some examples of the methods, apparatus, and non-transitory computer-readable media described herein, measuring the interference may include operations, features, units, or instructions for performing the following: generating an interference power measurement for the symbol period, wherein the CV2X waveform may be decoded based on the interference power measurement.

[0016] In some examples of the methods, apparatus, and non-transitory computer-readable media described herein, measuring the interference may include operations, features, units, or instructions for performing the following: generating noise statistics, interference statistics, or both for the symbol period, wherein the CV2X waveform may be decoded based on the noise statistics, the interference statistics, or both.

[0017] In some examples of methods, apparatus, and non-transitory computer-readable media described herein, decoding the CV2X waveform may include operations, features, units, or instructions for performing the following: decoding the CV2X waveform in the second TTI occurring after the first TTI based on the measured interference.

[0018] In some examples of the methods, apparatus, and non-transitory computer-readable media described herein, the second TTI occurs immediately after the first TTI.

[0019] In some examples of the methods, apparatus, and non-transitory computer-readable media described herein, at least one intervening TTI occurs between the first TTI and the second TTI.

[0020] In some examples of methods, apparatus, and non-transitory computer-readable media described herein, decoding the CV2X waveform may include operations, features, means, or instructions for applying a noise whitening process to the CV2X waveform based at least on an interference measurement.

[0021] In some examples of methods, apparatus, and non-transitory computer-readable media described herein, decoding the CV2X waveform may include operations, features, means, or instructions for: decoding the CV2X waveform in the first TTI.

[0022] In some examples of the methods, apparatus, and non-transitory computer-readable media described herein, measuring the interference may include operations, features, units, or instructions for performing the following: measuring interference of at least one additional RAT for the symbol period, wherein the CV2X waveform may be decoded based on the measured interference of the at least one additional RAT.

[0023] Some examples of the methods, apparatus, and non-transitory computer-readable media described herein may also include operations, features, units, or instructions for performing the following: measuring interference within a second symbol period, wherein the CV2X waveform may be decoded based on the interference measured within the second symbol period.

[0024] In some examples of methods, apparatus, and non-transitory computer-readable media described herein, measuring the interference may include operations, features, means, or instructions for measuring the interference of the WLAN RAT during the symbol period.

[0025] In some examples of methods, apparatus, and non-transitory computer-readable media described herein, measuring the interference may include operations, features, means, or instructions for measuring the interference of the LTERAT during the symbol period.

[0026] In some examples of the methods, apparatus, and non-transitory computer-readable media described herein, the first TTI may be a subframe. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] Figure 1

[0013] An example of a system for wireless communications in accordance with aspects of the present disclosure is shown.

[0028] Figure 2

[0013] An example of a system for wireless communications in accordance with aspects of the present disclosure is shown.

[0029] Figure 3 Examples of subframe structures according to aspects of the present disclosure are shown.

[0030] Figure 4 An example of a process flow according to aspects of the present disclosure is shown.

[0031] Figure 5 and 6 A block diagram of a device according to aspects of the present disclosure is shown.

[0032] Figure 7 A block diagram of a communications manager in accordance with aspects of the present disclosure is shown.

[0033] Figure 8A diagram of a system including a device according to aspects of the present disclosure is shown.

[0034] Figures 9 to 12 A flow chart illustrating a method according to aspects of the present disclosure is shown. DETAILED DESCRIPTION

[0035] The described technology relates to improved methods, systems, devices and apparatuses that support interference cancellation between radio access technologies. In summary, the described technology provides an interference estimation process that efficiently measures interference from a radio access technology (RAT) that is different from cellular vehicle-to-everything (CV2X). Commonly used interference mitigation methods estimate channel interference on pilot signals used for channel estimation. This method may have greater complexity and may introduce delays into the system. The greater complexity translates into high power consumption, which may be prohibitive for cellular vehicle-to-everything (CV2X) applications. For example, high power consumption may cause temperature issues, such as increased temperature that the chip may not be able to withstand.

[0036] The present disclosure describes an interference estimation process that efficiently measures interference from a radio access technology (RAT) different from CV2X (e.g., WIFI and / or LTE). For example, when there is no CV2X signal, the UE can make interference measurements. This can be performed during the last symbol of the subframe immediately preceding the subframe of interest. For example, the UE can assume that there is no CV2X signal in symbol 13 of the subframe, and can detect WIFI interference in that symbol. The UE can then estimate the noise plus WIFI interference measured during symbol 13 to improve the noise plus interference whitening in subsequent subframes. In some cases, this estimation and mitigation of interference can occur for each subframe. For example, the estimation can occur at symbol 13 of subframe n-1 and apply to subframe n, the estimation can occur at symbol 13 of subframe n and apply to subframe n+1, and so on. In addition, the UE can estimate LTE interference to improve decoding of subframe n. For example, the UE may buffer the first thirteen symbols of a subframe (e.g., symbols 0 to 12 of subframe n), and then measure and estimate LTE interference over the fourteenth symbol (e.g., symbol 13). The UE may then decode the stored symbols of subframe n based on the LTE interference measurement.

[0037] The process described herein can allow the UE to estimate interference in the absence of CV2X signals, which leads to better interference statistics estimation than commonly used methods. In addition, the computational complexity is lower than current methods, which can improve communication speed by not introducing significant latency into CV2X communications.

[0038] Aspects of the present disclosure are first described in the context of wireless communication systems. Aspects of the present disclosure are further illustrated by and described with reference to apparatus diagrams, system diagrams, and flow diagrams related to inter-radio access technology interference cancellation.

[0039] Figure 1 An example of a wireless communication system 100 supporting inter-radio access technology interference cancellation according to aspects of the present disclosure is shown. The wireless communication system 100 may include a base station 105, a UE 115, and a core network 130. In some examples, the wireless communication system 100 may be a long term evolution (LTE) network, an improved LTE (LTE-A) network, an LTE-APro network, or a new radio (NR) network. In some cases, the wireless communication system 100 may support enhanced broadband communications, ultra-reliable (e.g., mission-critical) communications, low-latency communications, or communications with low-cost and low-complexity devices, or any combination thereof.

[0040] Base stations 105 may be dispersed throughout a geographic area to form a wireless communication system 100, and may be devices of different forms or with different capabilities. Base stations 105 and UEs 115 may communicate wirelessly via one or more communication links 125. Each base station 105 may provide a coverage area 110 over which UEs 115 and base stations 105 may establish communication links 125. Coverage areas 110 may be examples of geographic areas over which base stations 105 and UEs 115 support communication of signals according to one or more radio access technologies.

[0041] UEs 115 may be dispersed throughout the coverage area 110 of the wireless communication system 100, and each UE 115 may be stationary, mobile, or both at different times. UEs 115 may be devices of different forms or with different capabilities. Figure 1 Some example UEs 115 are shown in FIG. 1. The UEs 115 described herein may be able to communicate with various types of devices, such as other UEs 115, base stations 105, and / or network devices (e.g., core network nodes, relay devices, integrated access and backhaul (IAB) nodes, or other network devices), such as Figure 1 shown.

[0042] Base stations 105 may communicate with core network 130, or communicate with each other, or perform both operations. For example, base station 105 may interface with core network 130 via backhaul link 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) on backhaul link 120 (e.g., via X2, Xn or other interfaces), or communicate with each other indirectly (e.g., via core network 130), or perform both operations. In some examples, backhaul link 120 may be or include one or more wireless links.

[0043] One or more of the base stations 105 described herein may include or may be referred to by those skilled in the art as a base station transceiver, a wireless base station, an access point, a wireless transceiver, a Node B, an evolved Node B (eNB), a next generation Node B, or a Gigabit Node B (any of which may be referred to as a gNB), a Home Node B, a Home Evolved Node B, or some other appropriate terminology.

[0044] UE 115 may include or may be referred to as a mobile device, a wireless device, a remote device, a handheld device, or a subscriber device, or some other appropriate terminology, where a "device" may also be referred to as a unit, a station, a terminal, or a client, among other examples. UE 115 may also include or may be referred to as a personal electronic device, such as a cellular phone, a personal digital assistant (PDA), a tablet computer, a laptop computer, or a personal computer. In some examples, UE 115 may include or be referred to as a wireless local loop (WLL) station, an Internet of Things (IoT) device, an Internet of Everything (IoE) device, a machine type communication (MTC) device, etc., which may be implemented in various items such as appliances, vehicles, meters, etc.

[0045] The UE 115 described herein may be able to communicate with various types of devices, such as other UEs 115, which may sometimes act as relays, as well as base stations 105 and network devices, including macro eNBs or gNBs, small cell eNBs or gNBs, relay base stations, etc. Figure 1 shown.

[0046] The UE 115 and the base station 105 may communicate wirelessly with each other via one or more communication links 125 on one or more carriers. The term "carrier" may refer to a set of radio frequency spectrum resources having a defined physical layer structure for supporting the communication link 125. For example, a carrier for the communication link 125 may include a portion of a radio frequency spectrum band (e.g., a bandwidth portion (BWP)) that operates according to a physical layer channel 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 to coordinate operations for the carrier, user data, or other signaling. The wireless communication system 100 may support communication with the UE 115 using carrier aggregation or multi-carrier operation. Depending on the carrier aggregation configuration, the UE 115 may be configured with multiple downlink component carriers and one or more uplink component carriers. Carrier aggregation may be used with both frequency division duplex (FDD) component carriers and time division duplex (TDD) component carriers.

[0047] In some examples (e.g., in a carrier aggregation configuration), the carrier may also have acquisition signaling or control signaling to coordinate operations with respect to other carriers. A carrier may be associated with a frequency channel (e.g., an Evolved Universal Mobile Telecommunications System Terrestrial Radio Access (E-UTRA) Absolute Radio Frequency Channel Number (EARFCN)) and may be placed according to a channel grid to be discovered by a UE 115. A carrier may operate in a standalone mode, where a UE 115 performs initial acquisition and connection via a carrier, or a carrier may operate in a non-standalone mode, where a different carrier (e.g., of the same or different radio access technology) is used to anchor a connection.

[0048] The communication link 125 shown in the wireless communication system 100 may include an uplink transmission from the UE 115 to the base station 105, or a downlink transmission from the base station 105 to the UE 115. A carrier may carry downlink or uplink communications (e.g., in FDD mode) or may be configured to carry both downlink and uplink communications (e.g., in TDD mode).

[0049] A carrier may be associated with a particular bandwidth of a radio frequency spectrum, and in some examples, a carrier bandwidth may be referred to as a "system bandwidth" of a carrier or wireless communication system 100. For example, a carrier bandwidth may be one of a plurality of predetermined bandwidths of a carrier for a particular radio access technology (e.g., 1.4, 3, 5, 10, 15, 20, 40, or 80 megahertz (MHz)). A device of the wireless communication system 100 (e.g., a base station 105, a UE 115, or both) may have a hardware configuration that supports communication on a particular carrier bandwidth, or may be configurable to support communication on one of a set of carrier bandwidths. In some examples, the wireless communication system 100 may include a base station 105 and / or a UE 115 that supports simultaneous communication via carriers associated with a plurality of carrier bandwidths. In some examples, each served UE 115 may be configured to operate on a portion (e.g., a subband, a BWP) or all of a carrier bandwidth.

[0050] The signal waveform transmitted on the carrier may be composed of multiple subcarriers (e.g., using multicarrier modulation (MCM) techniques such as orthogonal frequency division multiplexing (OFDM) or discrete Fourier transform spread OFDM (DFT-S-OFDM)). In a system employing MCM techniques, a resource element may be composed of a symbol period (e.g., the duration of a modulation symbol) and a subcarrier, where the symbol period and the 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 coding rate of the modulation scheme, or both). Therefore, the more resource elements received by UE 115 and the higher the order of the modulation scheme, the higher the data rate for UE 115 can be. Wireless communication resources may refer to a combination of radio frequency spectrum resources, time resources, and spatial resources (e.g., spatial layers or beams), and the use of multiple spatial layers may further increase the data rate or data integrity for communication with UE 115.

[0051] One or more numerologies for a carrier may be supported, where the numerology may include a subcarrier spacing (Δf) and a cyclic prefix. A carrier may be divided into BWPs with the same or different numerologies. In some cases, a UE 115 may be configured with multiple BWPs. In some examples, a single BWP for a carrier is active at a given time, and communications for a UE 115 may be limited to the active BWP.

[0052] The basic time unit (which may be referred to as T s =1 / (Δf max ·N f ) seconds sampling period, where Δf maxIt can represent the maximum supported subcarrier spacing, and N f The time intervals for the base station 105 or the UE 115 may be expressed as multiples of a maximum supported discrete Fourier transform (DFT) size). The time intervals of the communication resources may be organized according to radio frames each having a specified duration (e.g., 10 milliseconds (ms)). Each radio frame may be identified by a system frame number (SFN) (e.g., ranging from 0 to 1023).

[0053] Each frame may include a plurality of consecutively numbered subframes or time slots, and each subframe or time slot may have the same duration. In some cases, a frame may be divided into subframes, and each subframe may be further divided into a plurality of 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 a plurality of symbol periods (e.g., depending on the length of a cyclic prefix added in front of each symbol period). In some wireless communication systems 100, a time slot may be further divided into a plurality of mini-time slots containing one or more symbols. Excluding the cyclic prefix, each symbol period may contain one or more (e.g., N f The duration of a symbol period may depend on the subcarrier spacing or the frequency band of operation.

[0054] A subframe, a time slot, a mini-time slot, or a symbol may be the smallest scheduling unit of the wireless communication system 100 and may be referred to as a transmission time interval (TTI). In some cases, the TTI duration (i.e., the number of symbol periods in a TTI) may be variable. Additionally or alternatively, the smallest scheduling unit of the wireless communication system 100 may be dynamically selected (e.g., in the form of a burst of shortened TTIs (sTTIs)).

[0055] Physical channels may be multiplexed on a carrier according to various techniques. For example, a time division multiplexing (TDM) technique, a frequency division multiplexing (FDM) technique, or a hybrid TDM-FDM technique may be used to multiplex physical control channels and physical data channels on a downlink carrier. A control region (e.g., a control resource set (CORESET)) for a physical control channel may be defined by a plurality of symbol periods, and may extend across a system bandwidth or a subset of a system bandwidth of a carrier. One or more control regions (e.g., CORESETs) may be configured for a group of UEs 115. For example, a UE 115 may monitor or search a control region for control information according to one or more search space sets, and each search space set may include one or more control channel candidates at one or more aggregation levels arranged in a cascaded manner. The aggregation level for a control channel candidate may refer to the number of control channel resources (e.g., control channel elements (CCEs)) associated with a coding information for a control information format having a given payload size. A search space set may include a common search space set configured for sending control information to a plurality of UEs 115 and a UE-specific search space set for sending control information to a specific UE 115.

[0056] Each base station 105 can provide communication coverage via one or more cells (e.g., macro cells, small cells, hot spots or other types of cells, or various combinations thereof). The term "cell" can refer to a logical communication entity used for communication with the base station 105 (e.g., on a carrier), and can be associated with an identifier (e.g., a physical cell identifier (PCID), a virtual cell identifier (VCID) or other) for distinguishing adjacent cells. In some examples, a cell can also refer to a geographic coverage area 110 or a portion of a geographic coverage area 110 (e.g., a sector) on which a logical communication entity operates. Depending on various factors (such as the capabilities of the base station 105), the range of such a cell can range from a smaller area (e.g., a building, a subset of a building) to a larger area. For example, a cell can be or include a building, a subset of a building, an external space between or overlapping geographic coverage areas 110, and the like.

[0057] A macro cell typically covers a relatively large geographic area (e.g., a radius of several kilometers), and may allow unrestricted access by a UE 115 with a service subscription to a network provider that supports the macro cell. A small cell may be associated with a lower power base station 105 than a macro cell, and the small cell may operate in the same or different (e.g., licensed, unlicensed) frequency band as the macro cell. A small cell may provide unrestricted access to a UE 115 with a service subscription to a network provider, or may provide restricted access to a UE 115 associated with a small cell (e.g., a UE 115 in a closed subscriber group (CSG), a UE 115 associated with a user in a residence or office, etc.). A base station 105 may support one or more cells, and may also support communication on one or more cells using one or more component carriers.

[0058] In some examples, a carrier may support multiple cells, and different cells may be configured according to different protocol types (e.g., MTC, narrowband IoT (NB-IoT), enhanced mobile broadband (eMBB), or others) that may provide access to different types of devices.

[0059] In some examples, the base stations 105 may be mobile and, therefore, provide communication coverage for 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. The wireless communication system 100 may include, for example, a heterogeneous network in which different types of base stations 105 provide coverage for respective geographic coverage areas 110 using the same or different radio access technologies.

[0060] Some UEs 115 (e.g., MTC or IoT devices) may be low-cost or low-complexity devices and may provide automated communication between machines (e.g., via machine-to-machine (M2M) communication). M2M communication or MTC may refer to data communication technology that allows devices to communicate with each other or with a base station 105 without human intervention. In some examples, M2M communication or MTC may include communications from devices that incorporate sensors or meters to measure or capture information and relay such information to a central server or application that utilizes the information or presents the information to a person interacting with the application. Some UEs 115 may be designed to collect information or implement automated behavior of machines or other devices. Examples of applications for MTC devices include smart metering, inventory monitoring, water level monitoring, equipment monitoring, healthcare monitoring, wildlife monitoring, climate and geological event monitoring, fleet management and tracking, remote security sensing, physical access control, and transaction-based commercial billing.

[0061] The wireless communication system 100 can be configured to support ultra-reliable communication or low-latency communication, or various combinations thereof. For example, the wireless communication system 100 can be configured to support ultra-reliable low-latency communication (URLLC) or mission-critical communication. UE115 can be designed to support ultra-reliable, low-latency or critical functions (e.g., mission-critical functions). Ultra-reliable communication can include private communication or group communication, and can be supported by one or more mission-critical services (such as mission-critical push-to-talk (MCPTT), mission-critical video (MCVideo), or mission-critical data (MCData). Support for mission-critical functions can include prioritization of services, and mission-critical services can be used for public safety or general commercial applications. The terms ultra-reliable, low-latency, mission-critical, and ultra-reliable low-latency can be used interchangeably in this article.

[0062] In some cases, 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 UEs 115 utilizing D2D communication may be within a geographic coverage area 110 of a base station 105. Other UEs 115 in such a group may be outside the geographic coverage area 110 of the base station 105, or otherwise unable to receive transmissions from the base station 105. In some cases, groups of UEs 115 communicating via D2D communication may utilize a one-to-many (1:M) system, wherein each UE 115 transmits to each other UE 115 in the group. In some examples, the base station 105 facilitates the scheduling of resources for D2D communication. In other cases, D2D communication is performed between UEs 115 without involving the base station 105.

[0063] In some systems, the D2D communication link 135 can be an example of a communication channel (such as a sidelink communication channel) between vehicles (e.g., UE 115). In some examples, the vehicle can communicate using vehicle-to-everything (V2X) communication, vehicle-to-vehicle (V2V) communication, or some combination of these items. The vehicle can use signals to send information related to traffic conditions, signal scheduling, weather, safety, emergency situations, or any other information related to the V2X system. In some cases, the vehicle in the V2X system can communicate with roadside infrastructure (such as a roadside unit), or communicate with the network via one or more network nodes (e.g., base station 105) using vehicle-to-network (V2N) communication, or both operations.

[0064] The core network 130 may provide user authentication, access authorization, tracking, Internet Protocol (IP) connection, and other access, routing or mobility functions. The core network 130 may be an evolved packet core (EPC) or a 5G core (5GC), which may include at least one control plane entity (e.g., a mobility management entity (MME), an access and mobility management function (AMF)) for managing access and mobility and at least one user plane entity (e.g., a serving gateway (S-GW), a packet data network (PDN) gateway (P-GW), a user plane function (UPF)) for routing packets to an external network or interconnecting to an external network. The control plane entity may manage non-access stratum (NAS) functions, such as mobility, authentication, and bearer management for UE 115 served by a base station 105 associated with the core network 130. User IP packets may be transmitted through a user plane entity, which may provide IP address allocation and other functions. The user plane entity may be connected to the IP service 150 of the network operator. Operator IP services 150 may include access to the Internet, an intranet, an IP Multimedia Subsystem (IMS), or packet-switched streaming services.

[0065] Some of the network devices (e.g., base station 105) may include subcomponents 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 UE 115 through multiple other access network transmission entities 145 (which may be referred to as radio heads, smart radio heads, or transmit / receive points (TRPs)). Each access network transmission 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 heads and ANC) or merged into a single network device (e.g., base station 105).

[0066] The wireless communication system 100 may operate using one or more frequency bands, typically in the range of 300 megahertz (MHz) to 300 gigahertz (GHz). Typically, the region from 300 MHz to 3 GHz is referred to as the ultra-high frequency (UHF) region or decimeter band because the wavelengths range from approximately one decimeter to one meter in length. UHF waves may be blocked or redirected by buildings and environmental features, but the waves may be sufficient to penetrate buildings for macro cells to provide service to UEs 115 located indoors. Transmissions using UHF waves may be associated with smaller antennas and shorter distances (e.g., less than 100 kilometers) compared to transmissions using smaller frequencies and longer waves in the high frequency (HF) or very high frequency (VHF) portions of the spectrum below 300 MHz.

[0067] The wireless communication system 100 may also operate in a super high frequency (SHF) region using a frequency band from 3 GHz to 30 GHz (also referred to as a centimeter band) or in an extremely high frequency (EHF) region of the spectrum (e.g., from 30 GHz to 300 GHz) (also referred to as a millimeter band). In some examples, the wireless communication system 100 may support millimeter wave (mmW) communications between UE 115 and base station 105, and the EHF antenna of the corresponding device may be even smaller and more closely spaced than the UHF antenna. In some cases, this may facilitate the use of antenna arrays within the device. However, the propagation of EHF transmissions may suffer from even greater atmospheric attenuation and shorter distances than SHF or UHF transmissions. The technology disclosed herein may be employed across transmissions using one or more different frequency regions, and the designated use of frequency bands across these frequency regions may differ according to the country or administrative body.

[0068] The wireless communication system 100 can utilize both licensed and unlicensed radio frequency spectrum bands. For example, the wireless communication system 100 can employ license assisted access (LAA), LTE unlicensed (LTE-U) wireless access technology, or NR technology in an unlicensed band (such as the 5 GHz industrial, scientific, and medical (ISM) band). When operating in an unlicensed radio frequency spectrum band, devices (such as base stations 105 and UEs 115) can employ carrier sensing for conflict detection and avoidance. In some cases, operations in unlicensed bands can be based on carrier aggregation configurations combined with component carriers operating in licensed bands (e.g., LAA). Operations in unlicensed spectrum can include downlink transmissions, uplink transmissions, P2P transmissions, D2D transmissions, and the like.

[0069] The base station 105 or UE 115 may be equipped with multiple antennas, which may be used to employ technologies such as transmit diversity, receive diversity, multiple-input multiple-output (MIMO) communications, or beamforming. The antennas of the base station 105 or UE 115 may be located within one or more antenna arrays or antenna panels (which may support MIMO operations 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 cases, the antennas or antenna arrays associated with the base station 105 may be located at different geographical locations. The base station 105 may have an antenna array having multiple rows and columns of antenna ports that the base station 105 may use to support beamforming for communications with the UE 115. Similarly, the UE 115 may have one or more antenna arrays that may support various MIMO or beamforming operations. Additionally or alternatively, the antenna panel may support radio frequency beamforming for signals sent via the antenna ports.

[0070] The base station 105 or UE 115 can use MIMO communication to take advantage of multipath signal propagation and increase spectral efficiency by sending or receiving multiple signals via different spatial layers. Such a technology may be referred to as spatial multiplexing. For example, a transmitting device may send 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 for channel measurement and reporting. MIMO technology includes single-user MIMO (SU-MIMO) (where multiple spatial layers are sent to the same receiving device) and multi-user MIMO (MU-MIMO) (where multiple spatial layers are sent to multiple devices).

[0071] Beamforming (which may also be referred to as spatial filtering, directional transmission, or directional reception) is a signal processing technique that can be used at a transmitting device or a receiving device (e.g., a base station 105, a UE 115) to form or direct an antenna beam (e.g., a transmit beam, a receive beam) along a spatial path between the transmitting device and the receiving device. Beamforming can be achieved by combining signals transmitted via antenna elements of an antenna array so that some signals propagating in a specific orientation relative to the antenna array experience constructive interference, while other signals experience destructive interference. Adjustments to signals transmitted via antenna elements may include the transmitting device or the receiving device applying certain amplitude offsets, phase offsets, or both to signals carried via antenna elements associated with the device. Adjustments associated with each of the antenna elements may be defined by a set of beamforming weights associated with a specific orientation (e.g., relative to the antenna array of the transmitting device or the receiving device, or relative to some other orientation).

[0072] When receiving various signals (such as synchronization signals, reference signals, beam selection signals, or other control signals) from the base station 105, the receiving device (e.g., UE 115) can try multiple reception configurations (e.g., directional listening). For example, the receiving device can try multiple reception directions by receiving via different antenna subarrays, by processing the received signals according to different antenna subarrays, by receiving according to different reception beamforming weight sets applied to the signals received at multiple antenna elements of the antenna array (e.g., different directional listening weight sets), or by processing the received signals according to different reception beamforming weight sets applied to the signals received at multiple antenna elements of the antenna array (any of which can be referred to as "listening" according to different reception configurations or reception directions). In some examples, the receiving device can use a single reception configuration to receive along a single beam direction (e.g., when receiving a data signal). A 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 otherwise acceptable signal quality based on listening according to multiple beam directions).

[0073] The wireless communication system 100 may be a packet-based network operated according to a layered protocol stack. In the user plane, the communication at the bearer or packet data convergence protocol (PDCP) layer may be IP-based. The radio link control (RLC) layer may perform packet segmentation and reassembly for transmission on a logical channel. The medium access control (MAC) layer may perform priority handling and multiplexing of logical channels to transport channels. The MAC layer may also support retransmission at the MAC layer using error detection techniques, error correction techniques, or both to improve link efficiency. In the control plane, the radio resource control (RRC) protocol layer may provide the establishment, configuration, and maintenance of an RRC connection (which supports radio bearers for user plane data) between the UE 115 and the base station 105 or the core network 130. At the physical layer, transport channels may be mapped to physical channels.

[0074] UE 115 and base station 105 can support retransmission of data to increase the possibility that the data is successfully received. Hybrid automatic repeat request (HARQ) feedback is a technology for increasing the possibility that data is correctly received on communication link 125. HARQ can 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 the throughput at the MAC layer under poor wireless conditions (e.g., low signal and noise conditions). In some cases, the device can support the same time slot HARQ feedback, wherein the device can provide HARQ feedback for data received in the previous symbol in the time slot in a specific time slot. In other cases, the device can provide HARQ feedback in subsequent time slots or according to some other time interval.

[0075] An interference estimation process may be performed at the UE 115 that efficiently measures interference from a radio access technology (RAT) different from CV2X (e.g., WIFI and / or LTE). For example, the UE 115 may perform interference measurements when there is no CV2X signal during the last symbol of the subframe immediately preceding the subframe of interest. For example, the UE 115 may assume that there is no CV2X signal in symbol 13 of the subframe and may detect WIFI interference in that symbol. The UE 115 may then estimate the noise plus WIFI interference measured during symbol 13 to improve noise plus interference whitening in subsequent subframes. For example, the estimation may occur at symbol 13 of subframe n-1 and be applied to subframe n, the estimation may occur at symbol 13 of subframe n and be applied to subframe n+1, and so on. In addition, the UE 115 may estimate LTE interference to improve decoding of subframe n. For example, UE 115 may buffer the first thirteen symbols of a subframe (e.g., symbols 0 to 12 of subframe n), and then measure and estimate LTE interference over the fourteenth symbol (e.g., symbol 13). UE 115 may then decode the stored symbols of subframe n based on the LTE interference measurement.

[0076] Figure 2 An example of a wireless communication system 200 that supports inter-radio access technology interference cancellation according to aspects of the present disclosure is shown. In some examples, the wireless communication system 200 can implement aspects of the wireless communication system 100. The wireless communication system 200 can include base stations 105-a and 105-b and UEs 115-a and 115-b, which can be respectively as described herein. Figure 1 Examples of corresponding base stations 105 and UEs 115 are described.

[0077] In some cases, UE 115-a may communicate (e.g., data transmission) with UE 115-b using a CV2X network (e.g., sidelink communication via CV2X) via link 205-c on antennas 220-a and 220-c. UE 115-a and UE 115-b may be able to communicate with base station 105-a (e.g., an access point operating in accordance with a wireless local area network (WLAN) RAT (such as WIFI)) and / or with base station 105-b (e.g., a base station operating in accordance with an LTE RAT) on additional RATs. For example, base station 105-a may communicate with UE 115-b via link 205-a on antenna 220-d. Additionally or alternatively, base station 105-b may communicate with UE 115-b via link 205-b on antenna 220-d.

[0078] In some cases, transmissions (e.g., 205-a) from a base station 105-a (e.g., a WLAN AP) may interfere with CV2X communications between UEs 115-a and 115-b on link 205-c. The interfering transmission may be sent to UE 115-b or another UE 115 not shown, which may or may not communicate with UE 115-a. According to aspects of the present disclosure, CV2X may operate in an intelligent transmission system (ITS) band that is adjacent to one or more bands for WLAN RAT (e.g., one or more WIFI channels may be close to the ITS band in frequency). In some cases, the WIFI channel TTI may not be aligned in time with the CV2X channel TTI, and the WIFI transmission may not be synchronized with the CV2X transmission. In some cases, interference from the WIFI channel of the base station 105-a may leak into the CV2X band for link 205-c. The interference may affect the performance of a CV2X receiver (e.g., UE 115-a or UE 115-b) by degrading the signal quality (e.g., SNR) of one or more CV2X transmissions.

[0079] It may be beneficial to estimate interference from base station 105-a on link 205-c at antenna 220-a to improve signal quality of CV2X transmissions on link 205-c. However, estimating interference within a CV2X subframe may be complex, consume a lot of power, and may cause delays in communications between UEs 115-a and 115-b.

[0080] In addition, transmissions (e.g., 205-b) from base station 105-b (e.g., an LTE base station) may interfere with CV2X communications between UE 115-a and 115-b on link 205-c. The interfering transmission may be sent to UE 115-b or another UE 115 not shown, which may or may not communicate with UE 115-a. In some cases, interference from the LTE channel of base station 105-b may leak into the CV2X band used for link 205-c. The interference may significantly affect the performance of a CV2X receiver (e.g., UE 115-a or UE 115-b) by degrading the signal quality (e.g., SNR) of one or more CV2X transmissions. Therefore, it may also be beneficial to estimate the interference from base station 105-b on link 205-c at antenna 220-a to improve the signal quality of CV2X transmissions on link 205-c. However, estimating interference on the LTE channel on the CV2X subframe may be complicated due to the rapid changes in the waveform on the LTE channel on link 205-b. For example, there may be a new waveform in each LTE subframe.

[0081] Described herein is a process for estimating WIFI interference (e.g., from base station 105-a) statistics and / or optional LTE interference (e.g., from base station 105-b) statistics on CV2X (e.g., sidelink communications on link 205-c) with low complexity. The estimation may occur during time periods when CV2X transmissions are not being sent. In some examples, the interference estimation process may generate a covariance interference metric (e.g., a covariance matrix) to define and then eliminate interference. For example, as shown in Equation 1, a two-by-two covariance matrix R may be generated for noise plus interference (e.g., WIFI interference) at the frequency of CV2X based on measurements taken when no CV2X communications are occurring on the two receive antennas of UE 115-a.

[0082]

[0083] In the matrix R, the covariance between the interference signal and the CV2X signal can be measured at multiple receiver antennas (e.g., two antennas 220-a and 220-b). The diagonal elements r 11 and r 22 The average of the absolute square values ​​of may represent the sum of the detected noise plus interference powers received at antennas 220-a and 220-b. The off-diagonal elements r 12 and r 21 The conjugate multiplication of each time sample at each receiver antenna may be represented by . UE 115-a and / or 115-b may apply the matrix R -1 / 2 , so that the noise plus interference on the receiver antennas (e.g., antennas 220-a and 220-b or 220-c and 220-d) used for CV2X communication between UE 115-a and 115-b is whitened. Whitening the noise plus interference can allow UE 115-a to improve the performance of CV2X communication link 205-c with UE 115-b by increasing the success rate of decoding received CV2X transmissions at UE 115-a. The estimation and / or whitening of interference can be applied to one or more CV2X subframes based on the variance of the interference. In addition, UE 115-a can generate UE 115-a and / or 115-b can also generate statistics by monitoring noise and / or interference (e.g., WIFI interference, LTE interference, or both) over time, and use the generated statistics for noise cancellation. The statistics may include, for example, average noise power, average interference power, etc.

[0084] Figure 3An example of a subframe structure 300 that supports inter-radio access technology interference cancellation according to aspects of the present disclosure is shown. In some examples, the subframe structure 300 can implement aspects of the wireless communication system 100 and / or 200. The subframe structure 300 can include CV2X subframe n-1 315 and CV2X subframe n 320. Although not explicitly shown, additional subframes can exist in the subframe structure 300.

[0085] Subframe n-1 315 and subframe n 320 may each include 14 symbols. In some examples, the first two symbols of subframe n-1 315 and subframe n 320 may include a physical sidelink channel 305-a. Assuming the symbols are numbered from zero to thirteen, symbols two, five, eight, and eleven may include a demodulation reference signal (DMRS). The remaining symbols of subframe n-1 315 and subframe n-320 may include a physical sidelink channel 305-a, except for the last symbol 310. When CV2X transmission does not occur, symbol 310 may be a guard symbol for each subframe n-1 315 and subframe n 320. The estimation process described herein may occur in this guard symbol 310.

[0086] In some cases, the UE may know that the CV2X waveform in symbol 13 in a subframe does not have data (e.g., there is no CV2X transmission in the subframe) to allow transmitter-receiver turnaround and downlink timing adjustment. Since the ITS band can be used solely for CV2X communication and all CV2X wireless devices (e.g., UEs) are synchronized with GPS in subframe timing, the UE can safely assume that there is no CV2X signal in symbol 13 (e.g., symbol 310). Since WIFI is not synchronized with CV2X, the UE can detect WIFI interference in symbol 13 (e.g., symbol 310) of a subframe (e.g., subframe n-1 315) before the subframe in which the CV2X signal is decoded (e.g., subframe n 320). For example, the UE can estimate the noise plus WIFI interference during symbol 310-a of subframe n-1 315, and the UE uses this estimate to improve the noise plus interference whitening in subframe n 320. In some cases, when the interference (and noise) is within the threshold of the measurement at symbol 310-a, the UE may apply noise plus interference whitening to more than one subsequent subframe. In some cases, this estimation and mitigation of interference may occur every subframe. For example, estimation may occur at symbol 310-a and applied to subframe n 320, and estimation may occur at 310-b to apply to subframe n+1, and so on.

[0087] In addition, the UE may estimate LTE interference on subframe n. For example, the UE may buffer the first thirteen symbols of the subframe (e.g., symbols 0 to 12 of subframe n), and then measure and estimate LTE interference during the fourteenth symbol (e.g., symbol 13, symbol 310-b). The UE may then decode the buffered symbols of subframe n based on the LTE interference measurement at symbol 310-b. In some examples, the LTE interference estimate at symbol 310-b may be combined with the noise plus WIFI interference estimate at symbol 310-a to improve decoding of subframe n 320. In some cases, in addition to the measurement at 310-a, the UE may make additional WIFI plus noise measurements at symbol 310-b. These interference measurements may be used individually or in combination for whitening estimates of subframe n. Similarly, additional LTE interference measurements may be made at symbol 310-a for use with the measurement at 310-b, which may be used individually or in combination for whitening estimates of subframe n.

[0088] Figure 4 An example of a process flow 400 for supporting inter-radio access technology interference cancellation according to aspects of the present disclosure is shown. In some examples, the process flow 400 can implement aspects of the wireless communication system 100 and / or 200. The process flow 400 can include UE 115-c and UE 115-d, which can be as described herein. Figure 1-3 An example UE 115 is described.

[0089] In the following description of process flow 400, operations between UE 115-c and UE 115-d may be sent in an order different from that shown, or operations performed by UE 115-c and UE 115-d may be performed in a different order or at a different time. Certain operations may also be omitted 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 multiple operations of process flow 400, any wireless device may perform the operations shown.

[0090] At 405, UE 115-c may identify, within a first TTI, a symbol period in which a set of wireless devices (e.g., UE 115-c and UE 115-d) operating in accordance with the CV2X RAT are configured to avoid transmitting. For example, UE 115-c may identify the symbol period as indicated in a preconfiguration (e.g., from a technical specification) for the CV2X RAT. The preconfiguration may be stored locally in a memory or other storage device of UE 115-c. In some examples, UE 115-c may identify the symbol period as indicated in receive control signaling (e.g., RRC signaling) received from a serving base station that configures UE 115-c to avoid transmitting during the symbol period.

[0091] At 410, the UE 115-c may measure interference of a second RAT during a symbol period, the second RAT being different from the CV2X RAT (e.g., a WLAN RAT). In some examples, the symbol period may be a last symbol of the first TTI (e.g., a 14-symbol subframe). Measuring interference at 410 may optionally include generating, for the symbol period, a plurality of interference measurements using a plurality of antennas of the UE, and generating a covariance interference metric based on the plurality of interference measurements, wherein the CV2X waveform is decoded based on the covariance interference metric.

[0092] At 415, UE 115-c may optionally measure interference of at least one additional RAT different from the CV2X RAT (e.g., LTE RAT) for a symbol period. In some examples, the symbol period may be the last symbol of the first TTI (e.g., subframe) and / or at least a portion of subframe n. Measuring interference at 415 may optionally include generating multiple interference measurements using multiple antennas of the UE for the symbol period, and generating a covariance interference metric based on the multiple interference measurements, wherein the CV2X waveform is decoded based on the covariance interference metric. In some examples, the covariance interference metric may be based on the measurements of the interference at 410 and 415. For example, the covariance interference metric may be based on WLAN interference and LTE interference.

[0093] At 420, UE 115-d may send subframe n to UE 115-c. Subframe n may occur immediately after the first TTI at which measurement 410 is made. In some cases, subframe n may occur immediately before subframe n+1. Subframe n may include control signaling (e.g., DMRS) and / or data.

[0094] At 425, the UE 115-c may decode the CV2X waveform during the first TTI or the second TTI based on the interference measured at 410 and the interference of at least one additional RAT optionally measured at 415. In some examples, the UE 115-c may apply a noise whitening process to the CV2X waveform based on the interference measurement at 410 and optionally the interference measurement at 415.

[0095] At 430, UE 115-d may optionally send subframe n+1 to UE 115-c. Subframe n+1 may occur immediately after subframe n. Subframe n+1 may include control signaling (e.g., DMRS) and / or data.

[0096] At 435, the UE 115-c may optionally decode the CV2X waveform during the third TTI based on the interference measured at 410 and the interference of the at least one additional RAT optionally measured at 415. In some examples, the UE 115-c may apply a noise whitening process to the CV2X waveform based on interference measurements from previous measurements (e.g., performed at 410 and / or 415). In some cases, the UE 115-c may optionally measure interference within a second symbol period (e.g., subframe n), wherein the CV2X waveform for subframe n+1 is decoded based on the interference measured within the second symbol period (e.g., subframe n).

[0097] Figure 5 A block diagram 500 of a device 505 supporting inter-radio access technology interference cancellation according to aspects of the present disclosure is shown. The device 505 may be an example of aspects of a UE 115 as described herein. The device 505 may include a receiver 510, a communication manager 515, and a transmitter 520. The device 505 may also include a processor. Each of these components may communicate with each other (e.g., via one or more buses).

[0098] The receiver 510 may receive information such as packets, user data, or control information associated with various information channels (e.g., control channels, data channels, and information related to inter-radio access technology interference cancellation, etc.). The information may be communicated to other components of the device 505. The receiver 510 may be a reference Figure 8 Examples of aspects of the transceiver 820 are described. The receiver 510 may utilize a single antenna or a collection of antennas.

[0099] The communication manager 515 may perform the following operations: identifying within a first TTI a symbol period in which a set of wireless devices operating according to a cellular vehicle-to-everything (CV2X) RAT are configured to avoid transmitting; measuring interference of a second RAT during the symbol period, the second RAT being different from the CV2X RAT; and decoding a CV2X waveform during the first TTI or the second TTI based on the measured interference. The communication manager 515 may be an example of various aspects of the communication manager 810 described herein. The actions performed by the communication manager 515 described herein may be implemented to achieve one or more potential advantages. One implementation may allow the UE 115 to save power and reduce interference cancellation computational complexity by avoiding having to perform interference measurements when a CV2X signal is present. Another implementation may provide improved quality of service and reliability at the UE 115 because latency and interference at the UE 115 may be reduced.

[0100] The communication manager 515 or its subcomponents may be implemented in hardware, in code executed by a processor (e.g., software or firmware), or any combination thereof. If implemented in code executed by a processor, the functions of the communication manager 515 or its subcomponents may be performed by a general purpose processor, a digital signal processor (DSP), an application specific integrated circuit (ASIC), a field programmable gate array (FPGA) or other programmable logic device, discrete gate or transistor logic, discrete hardware components, or any combination thereof designed to perform the functions described in the present disclosure.

[0101] The communication manager 515 or its subcomponents may be physically located at various locations, including being distributed so that portions of the functions are implemented by one or more physical components at different physical locations. In some examples, according to various aspects of the present disclosure, the communication manager 515 or its subcomponents may be separate and distinct components. In some examples, according to various aspects of the present disclosure, the communication manager 515 or its subcomponents may be combined with one or more other hardware components (including, but not limited to, input / output (I / O) components, transceivers, network servers, another computing device, one or more other components described in the present disclosure, or combinations thereof).

[0102] The transmitter 520 may transmit signals generated by other components of the device 505. In some examples, the transmitter 520 may be co-located with the receiver 510 in a transceiver module. For example, the transmitter 520 may be a reference Figure 8 Examples of aspects of the transceiver 820 are described. The transmitter 520 may utilize a single antenna or a collection of antennas.

[0103] Figure 6A block diagram 600 of a device 605 supporting inter-radio access technology interference cancellation according to aspects of the present disclosure is shown. The device 605 may be an example of aspects of a device 605 or UE 115 as described herein. The device 605 may include a receiver 610, a communication manager 615, and a transmitter 635. The device 605 may also include a processor. Each of these components may communicate with each other (e.g., via one or more buses).

[0104] The receiver 610 may receive information such as packets, user data, or control information associated with various information channels (e.g., control channels, data channels, and information related to inter-radio access technology interference cancellation, etc.). The information may be communicated to other components of the device 605. The receiver 610 may be a reference Figure 8 Examples of aspects of the transceiver 820 are described. The receiver 610 may utilize a single antenna or a collection of antennas.

[0105] The communication manager 615 may be an example of aspects of the communication manager 515 as described herein. The communication manager 615 may include a symbol period identifier 620, an interference detector 625, and a decoder 630. The communication manager 615 may be an example of aspects of the communication manager 810 as described herein.

[0106] The symbol period identifier 620 may identify, within the first TTI, symbol periods in which a set of wireless devices operating according to a cellular vehicle-to-everything (CV2X) RAT are configured to avoid transmitting.

[0107] The interference detector 625 may measure interference of a second RAT during the symbol period, the second RAT being different from the CV2X RAT.

[0108] The decoder 630 may decode the CV2X waveform during the first TTI or the second TTI based on the measured interference.

[0109] The transmitter 635 can transmit signals generated by other components of the device 605. In some examples, the transmitter 635 can be co-located with the receiver 610 in a transceiver module. For example, the transmitter 635 can be a reference Figure 8 Examples of aspects of the transceiver 820 are described. The transmitter 635 may utilize a single antenna or a collection of antennas.

[0110] Based on reducing the computational complexity of interference cancellation (eg, whitening), the processor of the UE 115 (eg, controlling the receiver 610, the transmitter 635, or as described in reference Figure 8The transceiver 820 described herein can efficiently determine what kind of interference from non-CV2X RATs exists on CV2X transmissions. In addition, the processor of the UE 115 can reduce power consumption due to the reduced computational complexity. Therefore, the processor can avoid overheating.

[0111] Figure 7 A block diagram 700 of a communication manager 705 supporting inter-radio access technology interference cancellation in accordance with aspects of the present disclosure is shown. The communication manager 705 may be an example of aspects of the communication manager 515, the communication manager 615, or the communication manager 810 described herein. The communication manager 705 may include a symbol period identifier 710, an interference detector 715, a decoder 720, a transmission manager 725, an interference metric generator 730, a buffer 735, a noise whitening manager 740, a WLAN interference detector 745, and a LTE interference detector 750. Each of these modules may communicate with each other directly or indirectly (e.g., via one or more buses).

[0112] The symbol period identifier 710 may identify, within a first TTI, a symbol period in which a set of wireless devices operating according to a cellular vehicle-to-everything (CV2X) RAT are configured to avoid transmitting. In some examples, the symbol period identifier 710 may identify that the symbol period is a last symbol period of a first TTI, the first TTI including the set of symbol periods. In some cases, the first TTI is a subframe.

[0113] The interference detector 715 may measure interference of a second RAT during a symbol period, the second RAT being different from the CV2X RAT. In some examples, the interference detector 715 may generate an interference measurement set using a set of antennas of the UE for the symbol period. In some examples, the interference detector 715 may generate an interference power measurement for the symbol period, wherein the CV2X waveform is decoded based on the interference power measurement. In some examples, the interference detector 715 may measure interference of at least one additional RAT for the symbol period, wherein the CV2X waveform is decoded based on the measured interference of at least one additional RAT. In some examples, the interference detector 715 may measure interference within a second symbol period, wherein the CV2X waveform is decoded based on the interference measured within the second symbol period.

[0114] The decoder 720 may decode the CV2X waveform during the first TTI or the second TTI based on the measured interference. In some examples, the decoder 720 may decode the CV2X waveform in the second TTI occurring after the first TTI based on the measured interference. In some examples, the decoder 720 may decode the CV2X waveform in the first TTI. In some cases, the second TTI occurs immediately after the first TTI. In some cases, at least one intermediate TTI occurs between the first TTI and the second TTI.

[0115] Transmission manager 725 may identify pre-configuration or received control signaling that configures the UE to avoid transmitting during the symbol period.

[0116] The interference metric generator 730 may generate a covariance interference metric based on the interference measurement set, wherein the CV2X waveform is decoded based on the covariance interference metric. In some examples, the interference metric generator 730 may generate noise statistics, interference statistics, or both for a symbol period, wherein the CV2X waveform is decoded based on the noise statistics, interference statistics, or both.

[0117] The buffer 735 may buffer samples of a CV2X waveform generated for a set of symbol periods in a first TTI that occur prior to a symbol period within the first TTI, wherein the CV2X waveform is received during the first TTI and decoded based on the buffered samples.

[0118] The noise whitening manager 740 may apply a noise whitening process to the CV2X waveform based at least on the interference measurement.

[0119] WLAN interference detector 745 may measure interference of the WLAN RAT during the symbol period. LTE interference detector 750 may measure interference of the LTE RAT during the symbol period.

[0120] Figure 8 A diagram of a system 800 including a device 805 supporting inter-radio access technology interference cancellation according to aspects of the present disclosure is shown. The device 805 may be an example of or include a component of a device 505, device 605, or UE 115 as described herein. The device 805 may include components for two-way voice and data communications, including components for sending and receiving communications, including a communication manager 810, an I / O controller 815, a transceiver 820, an antenna 825, a memory 830, and a processor 840. These components may communicate electronically via one or more buses (e.g., bus 845).

[0121] The communication manager 810 may perform the following operations: identifying, within a first TTI, a symbol period in which a set of wireless devices operating according to a cellular vehicle-to-everything (CV2X) RAT are configured to avoid transmitting; measuring interference of a second RAT during the symbol period, the second RAT being different from the CV2X RAT; and decoding the CV2X waveform during the first TTI or the second TTI based on the measured interference.

[0122] I / O controller 815 can manage input and output signals for device 805. I / O controller 815 can also manage peripheral devices that are not integrated into device 805. In some cases, I / O controller 815 can represent a physical connection or port to an external peripheral device. In some cases, I / O controller 815 can utilize a computer such as a An operating system or another known operating system. In other cases, I / O controller 815 can represent or interact with a modem, keyboard, mouse, touch screen, or similar device. In some cases, I / O controller 815 can be implemented as part of a processor. In some cases, a user can interact with device 805 via I / O controller 815 or via hardware components controlled by I / O controller 815.

[0123] The transceiver 820 may communicate bidirectionally via one or more antennas, wired or wireless links as described herein. For example, the transceiver 820 may represent a wireless transceiver and may communicate bidirectionally with another wireless transceiver. The transceiver 820 may also include a modem for modulating packets and providing the modulated packets to an antenna for transmission, and demodulating packets received from an antenna.

[0124] In some cases, a wireless device may include a single antenna 825. However, in some cases, the device may have more than one antenna 825, which may be capable of concurrently sending or receiving multiple wireless transmissions.

[0125] The memory 830 may include RAM and ROM. The memory 830 may store computer-readable, computer-executable code 835, which includes instructions that, when executed, cause the processor to perform various functions described herein. In some cases, the memory 830 may also include a basic input and output system (BIOS), etc., which may control basic hardware or software operations, such as interaction with peripheral components or devices.

[0126] The processor 840 may include an intelligent hardware device (e.g., a general-purpose processor, a DSP, a CPU, a microcontroller, an ASIC, an FPGA, a programmable logic device, a discrete gate or transistor logic component, a discrete hardware component, or any combination thereof). In some cases, the processor 840 may be configured to operate a memory array using a memory controller. In other cases, the memory controller may be integrated into the processor 840. The processor 840 may be configured to execute computer-readable instructions stored in a memory (e.g., memory 830) to cause the device 805 to perform various functions (e.g., functions or tasks that support interference cancellation between radio access technologies).

[0127] The code 835 may include instructions for implementing various aspects of the present disclosure, including instructions for supporting wireless communications. The code 835 may be stored in a non-transitory computer-readable medium (e.g., system memory or other types of memory). In some cases, the code 835 may not be directly executable by the processor 840, but may cause a computer (e.g., when compiled and executed) to perform the functions described herein.

[0128] Fig. 9 A flow chart illustrating a method 900 for supporting inter-radio access technology interference cancellation according to aspects of the present disclosure is shown. The operations of the method 900 may be implemented by a UE 115 or a component thereof as described herein. For example, the operations of the method 900 may be implemented by a UE 115 or a component thereof as described herein. Figures 5 to 8 In some examples, the UE may execute an instruction set to control the functional elements of the UE to perform the functions described herein. Additionally or alternatively, the UE may use dedicated hardware to perform various aspects of the functions described herein.

[0129] At 905, the UE may identify, within a first TTI, a symbol period in which a set of wireless devices operating according to a cellular vehicle-to-everything (CV2X) RAT are configured to avoid transmitting. The operations of 905 may be performed according to methods described herein. In some examples, aspects of the operations of 905 may be performed as described in reference to Figures 5 to 8 This is performed by the symbol period identifier described.

[0130] At 910, the UE may measure interference of a second RAT during a symbol period, the second RAT being different from the CV2X RAT. The operations of 910 may be performed according to the methods described herein. In some examples, aspects of the operations of 910 may be performed as described in reference to Figures 5 to 8 The interference detector described is implemented.

[0131] At 915, the UE may decode the CV2X waveform during the first TTI or the second TTI based on the measured interference. The operations of 915 may be performed according to the methods described herein. In some examples, aspects of the operations of 915 may be as described in reference to Figures 5 to 8 The decoder described is executed.

[0132] Fig.10 A flow chart illustrating a method 1000 for supporting inter-radio access technology interference cancellation according to aspects of the present disclosure is shown. The operations of the method 1000 may be implemented by a UE 115 or a component thereof as described herein. For example, the operations of the method 1000 may be implemented by a UE 115 or a component thereof as described herein. Figures 5 to 8 In some examples, the UE may execute an instruction set to control the functional elements of the UE to perform the functions described herein. Additionally or alternatively, the UE may use dedicated hardware to perform various aspects of the functions described herein.

[0133] At 1005, the UE may identify, within a first TTI, a symbol period in which a set of wireless devices operating according to a cellular vehicle-to-everything (CV2X) RAT are configured to avoid transmitting. The operations of 1005 may be performed according to methods described herein. In some examples, aspects of the operations of 1005 may be performed as described in reference to Figures 5 to 8 This is performed by the symbol period identifier described.

[0134] At 1010, the UE may identify pre-configuration or received control signaling that configures the UE to avoid transmitting during a symbol period. The operations of 1010 may be performed according to methods described herein. In some examples, aspects of the operations of 1010 may be described with reference to Figures 5 to 8 The transfer manager described here is used to perform the

[0135] At 1015, the UE may identify that the symbol period is the last symbol period of the first TTI, the first TTI including the set of symbol periods. The operations of 1015 may be performed according to the methods described herein. In some examples, aspects of the operations of 1015 may be as described in reference to Figures 5 to 8 This is performed by the symbol period identifier described.

[0136] At 1020, the UE may measure interference of a second RAT during a symbol period, the second RAT being different from the CV2X RAT. The operations of 1020 may be performed according to methods described herein. In some examples, aspects of the operations of 1020 may be as described with reference to Figures 5 to 8 The interference detector described is implemented.

[0137] At 1025, the UE may decode the CV2X waveform during the first TTI or the second TTI based on the measured interference. The operations of 1025 may be performed according to the methods described herein. In some examples, aspects of the operations of 1025 may be as described with reference to Figures 5 to 8 The decoder described is executed.

[0138] Fig.11 1 is a flowchart illustrating a method 1100 for supporting inter-radio access technology interference cancellation according to aspects of the present disclosure. The operations of the method 1100 may be implemented by a UE 115 or a component thereof as described herein. For example, the operations of the method 1100 may be implemented by a UE 115 or a component thereof as described herein. Figures 5 to 8 In some examples, the UE may execute an instruction set to control the functional elements of the UE to perform the functions described herein. Additionally or alternatively, the UE may use dedicated hardware to perform various aspects of the functions described herein.

[0139] At 1105, the UE may identify, within a first TTI, a symbol period in which a set of wireless devices operating according to a cellular vehicle-to-everything (CV2X) RAT are configured to avoid transmitting. The operations of 1105 may be performed according to methods described herein. In some examples, aspects of the operations of 1105 may be performed as described in reference to Figures 5 to 8 This is performed by the symbol period identifier described.

[0140] At 1110, the UE may measure interference of a second RAT during a symbol period, the second RAT being different from the CV2X RAT. The operations of 1110 may be performed according to methods described herein. In some examples, aspects of the operations of 1110 may be performed as described in reference to Figures 5 to 8 The interference detector described is implemented.

[0141] At 1115, the UE may generate an interference measurement set using the UE's antenna set for the symbol period. The operations of 1115 may be performed according to the methods described herein. In some examples, aspects of the operations of 1115 may be as described in reference to Figures 5 to 8 The interference detector described is implemented.

[0142] At 1120, the UE may generate a covariance interference metric based on the interference measurement set, wherein the CV2X waveform is decoded based on the covariance interference metric. The operations of 1120 may be performed according to the methods described herein. In some examples, aspects of the operations of 1120 may be as described in reference to Figures 5 to 8 The interference metric generator described is implemented.

[0143] At 1125, the UE may decode the CV2X waveform during the first TTI or the second TTI based on the measured interference. The operations of 1125 may be performed according to the methods described herein. In some examples, aspects of the operations of 1125 may be as described with reference to Figures 5 to 8 The decoder described is executed.

[0144] Fig.12 A flow chart illustrating a method 1200 for supporting inter-radio access technology interference cancellation according to aspects of the present disclosure is shown. The operations of the method 1200 may be implemented by a UE 115 or a component thereof as described herein. For example, the operations of the method 1200 may be implemented by a UE 115 or a component thereof as described herein. Figures 5 to 8 In some examples, the UE may execute an instruction set to control the functional elements of the UE to perform the functions described herein. Additionally or alternatively, the UE may use dedicated hardware to perform various aspects of the functions described herein.

[0145] At 1205, the UE may identify, within a first TTI, a symbol period in which a set of wireless devices operating according to a cellular vehicle-to-everything (CV2X) RAT are configured to avoid transmitting. The operations of 1205 may be performed according to methods described herein. In some examples, aspects of the operations of 1205 may be performed as described in reference to Figures 5 to 8 This is performed by the symbol period identifier described.

[0146] At 1210, the UE may measure interference of a second RAT during a symbol period, the second RAT being different from the CV2X RAT. The operations of 1210 may be performed according to methods described herein. In some examples, aspects of the operations of 1210 may be as described with reference to Figures 5 to 8 The interference detector described is implemented.

[0147] At 1215, the UE may measure interference of at least one additional RAT for a symbol period, wherein the CV2X waveform is decoded based on the measured interference of at least one additional RAT. The operations of 1215 may be performed according to the methods described herein. In some examples, aspects of the operations of 1215 may be performed as described in reference to Figures 5 to 8 The interference detector described is implemented.

[0148] At 1220, the UE may apply a noise whitening process to the CV2X waveform based at least on the interference measurement. The operations of 1220 may be performed according to the methods described herein. In some examples, aspects of the operations of 1220 may be as described in reference to Figures 5 to 8 The noise whitening manager described here is implemented.

[0149] At 1225, the UE may decode the CV2X waveform during the first TTI or the second TTI based on the measured interference. The operations of 1225 may be performed according to the methods described herein. In some examples, aspects of the operations of 1225 may be as described in reference to Figures 5 to 8 The decoder described is executed.

[0150] It should be noted that the methods described herein describe possible implementations, and that operations and steps may be rearranged or otherwise modified, and other implementations are possible. Furthermore, aspects from two or more methods may be combined.

[0151] The technology described herein can be used in various wireless communication systems, such as code division multiple access (CDMA), time division multiple access (TDMA), frequency division multiple access (FDMA), orthogonal frequency division multiple access (OFDMA), single carrier frequency division multiple access (SC-FDMA) and other systems. CDMA systems can implement radio technologies such as CDMA 2000, Universal Terrestrial Radio Access (UTRA), etc. CDMA2000 covers IS-2000, IS-95 and IS-856 standards. IS-2000 versions can be generally referred to as CDMA2000 1X, 1X, etc. IS-856 (TIA-856) is generally referred to as CDMA2000 1xEV-DO, High Speed ​​Packet Data (HRPD), etc. UTRA includes broadband CDMA (W-CDMA) and other variants of CDMA. TDMA systems can implement radio technologies such as Global System for Mobile Communications (GSM).

[0152] OFDMA systems can implement radio technologies such as Ultra Mobile Broadband (UMB), Evolved UTRA (E-UTRA), Institute of Electrical and Electronics Engineers (IEEE) 802.11 (Wi-Fi), IEEE 802.16 (WiMAX), IEEE 802.20, Flash-OFDM, etc. UTRA and E-UTRA are part of Universal Mobile Telecommunications System (UMTS). LTE, LTE-A, and LTE-A Pro are versions of UMTS that use E-UTRA. UTRA, E-UTRA, UMTS, LTE, LTE-A, LTE-A Pro, NR, and GSM are described in documents from an organization named "3rd Generation Partnership Project" (3GPP). CDMA2000 and UMB are described in documents from an organization named "3rd Generation Partnership Project 2" (3GPP2). The technology described herein can be used for the systems and radio technologies mentioned herein as well as other systems and radio technologies. Although aspects of LTE, LTE-A, LTE-A Pro, or NR systems may be described for example purposes, and LTE, LTE-A, LTE-A Pro, or NR terminology may be used in much of the description, the techniques described herein may be applicable beyond LTE, LTE-A, LTE-A Pro, or NR applications.

[0153] A macro cell typically covers a relatively large geographic area (e.g., a radius of several kilometers) and may allow unrestricted access by a UE with a service subscription to a network provider. Compared to a macro cell, a small cell may be associated with a lower power base station, and the small cell may operate in the same or different frequency band as the macro cell (e.g., licensed, unlicensed, etc.). According to various examples, a small cell may include a pico cell, a femto cell, and a micro cell. For example, a pico cell may cover a small geographic area and may allow unrestricted access by a UE with a service subscription to a network provider. A femto cell may also cover a small geographic area (e.g., a residence) and may provide restricted access by a UE associated with the femto cell (e.g., a UE in a closed subscriber group (CSG), a UE for a user in a residence, etc.). An eNB for a macro cell may be referred to as a macro eNB. An eNB for a small cell may be referred to as a small cell eNB, a pico eNB, a femto eNB, or a home eNB. An eNB may support one or more (e.g., two, three, four, etc.) cells and may also support communications using one or more component carriers.

[0154] The wireless communication systems described herein may support synchronous operation or asynchronous operation. For synchronous operation, the base stations may have similar frame timing, and transmissions from different base stations may be approximately aligned in time. For asynchronous operation, the base stations may have different frame timing, and transmissions from different base stations may not be aligned in time. The techniques described herein may be used for synchronous operation or asynchronous operation.

[0155] The information and signals described herein may be represented using any of a variety of different techniques and methods. For example, data, instructions, commands, information, signals, bits, symbols, and chips that may be mentioned throughout the specification may be represented by voltage, current, electromagnetic waves, magnetic fields or particles, optical fields or particles, or any combination thereof.

[0156] The various illustrative blocks and modules described in conjunction with the disclosure herein may be implemented or executed using a general purpose processor, a DSP, an ASIC, an 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. A general purpose processor may be a microprocessor, but in an alternative, the processor may be any conventional 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, a plurality of microprocessors, a combination of one or more microprocessors and a DSP core, or any other such configuration).

[0157] 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 on or sent through a computer-readable medium as one or more instructions or codes. Other examples and implementations are within the scope of the present 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, hard wiring, or a combination of any of these items. Features that implement the functions may also be physically located at various locations, including being distributed so that portions of the functions are implemented at different physical locations.

[0158] Computer readable medium includes both non-transitory computer storage medium and communication medium, and communication medium includes any medium that promotes computer program to be transmitted from one place to another place.Non-transitory storage medium can be any available medium that can be accessed by general-purpose computer or special-purpose computer.By way of example and not limitation, non-transitory computer readable medium can include random access memory (RAM), read-only memory (ROM), electrically erasable programmable ROM (EEPROM), flash memory, compact disc (CD) ROM or other optical disc storage, disk storage or other magnetic storage device, or can be used for carrying or storing desired program code unit and can be accessed by general-purpose or special-purpose computer or general-purpose or special-purpose processor in the form of instruction or data structure.In addition, any connection is appropriately referred to as computer readable medium.For example, if software is to send from website, server or other remote source using coaxial cable, optical fiber cable, twisted pair, digital subscriber line (DSL) or wireless technology such as infrared, radio and microwave, then coaxial cable, optical fiber cable, twisted pair, DSL or wireless technology such as infrared, radio and microwave are included in the definition of medium. As used herein, disk and disc include CD, laser disc, optical disc, digital versatile disc (DVD), floppy disk and Blu-ray disc, wherein disks usually reproduce data magnetically, while discs reproduce data optically with lasers. Combinations of the above are also included within the scope of computer-readable media.

[0159] As used herein (including in the claims), "or" as used in a list of items (e.g., a list of items ending with a phrase such as "at least one of" or "one or more of") indicates an inclusive list, so that, for example, a list of at least one of 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). In addition, as used herein, the phrase "based on" should not be interpreted as a reference to a closed set of conditions. For example, an exemplary step described as "based on condition A" can be based on both condition A and condition B without departing from the scope of the present disclosure. In other words, as used herein, the phrase "based on" should be interpreted in the same manner as the phrase "based at least in part on."

[0160] In the accompanying drawings, similar components or features may have the same reference number. In addition, individual components of the same type may be distinguished by following the reference number with a dash and a second reference number, the second reference number being used to distinguish between similar components. If only the first reference number is used in the specification, the description applies to any one of the similar components having the same first reference number, without regard to the second reference number or other subsequent reference numbers.

[0161] The descriptions set forth herein in conjunction with the accompanying drawings describe example configurations and do not represent all examples that may be implemented or within the scope of the claims. The term "exemplary" as used herein means "used as an example, instance, or illustration," rather than "preferred" or "advantageous over other examples." For the purpose of providing an understanding of the described techniques, the detailed description includes specific details. However, these techniques may be practiced without these specific details. In some instances, well-known structures and devices are shown in block diagram form to avoid obscuring the concepts of the described examples.

[0162] The description herein is provided to enable those skilled in the art to implement or use the present disclosure. It will be apparent to those skilled in the art that various modifications to the present disclosure will be apparent, and the general principles defined herein may be applied to other variations without departing from the scope of the present disclosure. Therefore, the present disclosure is not limited to the examples and designs described herein, but is given the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A method for wireless communication at a user equipment (UE), comprising: identifying, within a first transmission time interval (TTI), a symbol period in which a set of wireless devices operating according to a cellular vehicle-to-everything (CV2X) radio access technology (RAT) are configured to avoid transmitting; measuring interference of a second RAT during the symbol period, the second RAT being different from the CV2X RAT, wherein measuring the interference comprises: generating a plurality of interference measurements using a plurality of antennas of the UE for the symbol period; and A CV2X waveform is decoded during the first TTI or the second TTI based at least in part on the measured interference.

2. The method according to claim 1, wherein: Identifying the symbol period comprises: Pre-configuration or received control signaling is identified that configures the UE to avoid transmitting during the symbol period.

3. The method according to claim 1, wherein: Identifying the symbol period comprises: The symbol period is identified as a last symbol period of the first TTI, the first TTI comprising a plurality of symbol periods.

4. The method according to claim 1, wherein: Measuring the interference further includes: A covariance interference metric is generated based at least in part on the plurality of interference measurements, wherein the CV2X waveform is decoded based at least in part on the covariance interference metric.

5. The method according to claim 1, further comprising: Samples of the CV2X waveform generated for a plurality of symbol periods in the first TTI that occur prior to the symbol period within the first TTI are buffered, wherein the CV2X waveform is received during the first TTI and decoded based at least in part on the buffered samples.

6. The method according to claim 1, wherein: Measuring the interference includes: An interference power measurement is generated for the symbol period, wherein the CV2X waveform is decoded based at least in part on the interference power measurement.

7. The method according to claim 1, wherein: Measuring the interference includes: A noise statistic, an interference statistic, or both are generated for the symbol period, wherein the CV2X waveform is decoded based at least in part on the noise statistic, the interference statistic, or both.

8. The method according to claim 1, wherein: Decoding the CV2X waveform involves: The CV2X waveform is decoded in the second TTI occurring after the first TTI based at least in part on the measured interference.

9. The method according to claim 8, wherein: The second TTI occurs immediately after the first TTI.

10. The method according to claim 8, wherein: At least one intervening TTI occurs between the first TTI and the second TTI.

11. The method according to claim 1, wherein: Decoding the CV2X waveform involves: A noise whitening process is applied to the CV2X waveform based at least on the interference measurement.

12. The method according to claim 1, wherein: Measuring the interference includes: Interference of at least one additional RAT is measured for the symbol period, wherein the CV2X waveform is decoded based at least in part on the measured interference of the at least one additional RAT.

13. The method according to claim 1, further comprising: Interference is measured during a second symbol period, wherein the CV2X waveform is decoded based at least in part on the interference measured during the second symbol period.

14. The method according to claim 1, wherein: Measuring the interference includes: The interference of a wireless local area network (WLAN) RAT is measured during the symbol period.

15. The method according to claim 1, wherein: Measuring the interference includes: The interference of a Long Term Evolution (LTE) RAT is measured during the symbol period.

16. The method according to claim 1, wherein: The first TTI is a subframe.

17. An apparatus for wireless communication, comprising: at least one processor, a memory coupled to the at least one processor; as well as Instructions, which are stored in the memory and can be executed by the at least one processor to cause the device to perform the following operations: identifying, within a first transmission time interval (TTI), a symbol period in which a set of wireless devices operating according to a cellular vehicle-to-everything (CV2X) radio access technology (RAT) are configured to avoid transmitting; and measuring interference of a second RAT during the symbol period, the second RAT being different from the CV2X RAT, wherein the instructions for measuring the interference are executable by the at least one processor to cause the apparatus to: generate, for the symbol period, a plurality of interference measurements using a plurality of antennas of the apparatus; and A CV2X waveform is decoded during the first TTI or the second TTI based at least in part on the measured interference.

18. The apparatus of claim 17, further comprising a decoder, wherein the instructions for decoding the CV2X waveform are executable by the at least one processor to cause the apparatus to: The decoder is configured to decode the CV2X waveform during the first TTI or the second TTI based at least in part on the measured interference.

19. The device according to claim 17, wherein: The instructions for identifying the symbol period are executable by the at least one processor to cause the apparatus to: Preconfiguration or received control signaling is identified that configures the apparatus to avoid transmitting during the symbol period.

20. The device according to claim 17, wherein: The instructions for identifying the symbol period are executable by the at least one processor to cause the apparatus to: The symbol period is identified as a last symbol period of the first TTI, the first TTI comprising a plurality of symbol periods.

21. The device according to claim 17, wherein: The instructions for measuring the interference may also be executed by the at least one processor to cause the apparatus to: A covariance interference metric is generated based at least in part on the plurality of interference measurements, wherein the CV2X waveform is decoded based at least in part on the covariance interference metric.

22. The device according to claim 17, wherein: The instructions are also executable by the at least one processor to cause the device to perform the following operations: Samples of the CV2X waveform generated for a plurality of symbol periods in the first TTI that occur prior to the symbol period within the first TTI are buffered, wherein the CV2X waveform is received during the first TTI and decoded based at least in part on the buffered samples.

23. The device according to claim 17, wherein: The instructions for measuring the interference may be executed by the at least one processor to cause the apparatus to: An interference power measurement is generated for the symbol period, wherein the CV2X waveform is decoded based at least in part on the interference power measurement.

24. The device according to claim 17, wherein: The instructions for measuring the interference may be executed by the at least one processor to cause the apparatus to: A noise statistic, an interference statistic, or both are generated for the symbol period, wherein the CV2X waveform is decoded based at least in part on the noise statistic, the interference statistic, or both.

25. The device according to claim 17, wherein: The instructions for decoding the CV2X waveform are executable by the at least one processor to cause the apparatus to: The CV2X waveform is decoded in the second TTI occurring after the first TTI based at least in part on the measured interference.

26. The device according to claim 17, wherein: The instructions for measuring the interference may be executed by the at least one processor to cause the apparatus to: Interference of at least one additional RAT is measured for the symbol period, wherein the CV2X waveform is decoded based at least in part on the measured interference of the at least one additional RAT.

27. The device according to claim 17, wherein: The instructions are also executable by the at least one processor to cause the device to perform the following operations: Interference is measured during a second symbol period, wherein the CV2X waveform is decoded based at least in part on the interference measured during the second symbol period.

28. An apparatus for wireless communication, comprising: means for identifying, within a first transmission time interval (TTI), symbol periods in which a set of wireless devices operating in accordance with a cellular vehicle-to-everything (CV2X) radio access technology (RAT) are configured to avoid transmitting; means for measuring interference of a second RAT during the symbol period, the second RAT being different from the CV2X RAT, wherein the means for measuring the interference comprises: means for generating a plurality of interference measurements using a plurality of antennas of the apparatus for the symbol period; and Means for decoding a CV2X waveform during the first TTI or the second TTI based at least in part on the measured interference.

29. A non-transitory computer-readable medium storing code for wireless communication by a user equipment (UE), the code comprising instructions executable by a processor to cause the UE to: identifying, within a first transmission time interval (TTI), a symbol period in which a set of wireless devices operating according to a cellular vehicle-to-everything (CV2X) radio access technology (RAT) are configured to avoid transmitting; and measuring interference of a second RAT during the symbol period, the second RAT being different from the CV2X RAT, wherein: Measuring the interference includes: generating a plurality of interference measurements using a plurality of antennas of the UE for the symbol period; as well as A CV2X waveform is decoded during the first TTI or the second TTI based at least in part on the measured interference.

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