Detection of reference signals and gating of reference signal processing

Abstract

Various aspects of the disclosure generally relate to wireless communication. In some aspects, a user equipment (UE) can detect, at a time instance of an expected reference signal, whether the reference signal is present in a channel. The UE can selectively perform gating processing of the reference signal based on detecting whether the reference signal is present in the channel. Numerous other aspects are described.

Description

[0001] Cross-reference to related applications

[0002] This patent application claims priority to U.S. Provisional Patent Application No. 63 / 138,144, filed January 15, 2021, entitled “DETECTION OF REFERENCE SIGNALS AND GATING OF REFERENCE SIGNAL PROCESSING,” and U.S. Non-Provisional Patent Application No. 17 / 647,923, filed January 13, 2022, entitled “DETECTION OF REFERENCE SIGNALS AND GATING OF REFERENCE SIGNAL PROCESSING,” which are expressly incorporated herein by reference. Technical Field

[0003] Various aspects of this disclosure generally relate to wireless communication, and specifically to techniques and apparatus for gating reference signal detection and reference signal processing in unlicensed spectrum. Background Technology

[0004] Wireless communication systems are widely deployed to provide various telecommunications services such as telephone, video, data, messaging, and broadcasting. Typical wireless communication systems employ multiple access technologies that enable communication with multiple users by sharing available system resources (e.g., bandwidth, transmit power, or similar resources). Examples of such multiple access technologies include Code Division Multiple Access (CDMA) systems, Time Division Multiple Access (TDMA) systems, Frequency Division Multiple Access (FDMA) systems, Orthogonal Frequency Division Multiple Access (OFDMA) systems, Single Carrier Frequency Division Multiple Access (SC-FDMA) systems, Time Division Synchronous Code Division Multiple Access (TD-SCDMA) systems, and Long Term Evolution (LTE). LTE / LTE-Advanced is a collection of enhancements to the Universal Mobile Telecommunications System (UMTS) mobile standard issued by the 3rd Generation Partnership Project (3GPP).

[0005] A wireless network may include one or more base stations supporting communication between user equipment (UE) or multiple UEs. UEs may communicate with base stations via downlink and uplink communication. "Downlink" (or "DL") refers to the communication link from the base station to the UE, while "uplink" (or "UL") refers to the communication link from the UE to the base station.

[0006] The aforementioned multiple access technologies have been adopted in various telecommunications standards to provide a common protocol enabling different UEs to communicate at the city, country, region, and / or global levels. New Radio (NR) (which may be referred to as 5G) is a set of enhancements to the LTE mobile standard issued by 3GPP. NR is designed to better support mobile broadband internet access by improving spectrum efficiency, reducing costs, improving service, using new spectrum, and better integrating with other open standards such as Orthogonal Frequency Division Multiplexing (OFDM) with Cyclic Prefix (CP) on the downlink, CP-OFDM and / or Single Carrier Frequency Division Multiplexing (SC-FDM) (also known as Discrete Fourier Transform Extended OFDM (DFT-s-OFDM)) on the uplink, and supporting beamforming, multiple-input multiple-output (MIMO) antenna technologies and carrier aggregation. Further improvements to LTE, NR, and other radio access technologies remain useful as the demand for mobile broadband access continues to increase. Summary of the Invention

[0007] In some aspects, a method for wireless communication by a UE includes detecting a time instance of a desired reference signal, whether the reference signal exists in the channel, and selectively performing gating processing of the reference signal based on the detection of whether the reference signal exists in the channel.

[0008] In some aspects, a UE for wireless communication includes a memory and one or more processors coupled to the memory, the one or more processors being configured to: detect, at a time instance of a desired reference signal, whether the reference signal is present in the channel; and selectively perform gating processing of the reference signal based on the detection that the reference signal is present in the channel.

[0009] In some aspects, a non-transitory computer-readable medium stores a set of instructions for wireless communication, the set of instructions including one or more instructions that, when executed by one or more processors of a UE, cause the UE to perform the following operations: detect a time instance of a desired reference signal, whether the reference signal is present in the channel; and selectively perform gating processing of the reference signal based on the detection that the reference signal is present in the channel.

[0010] In some aspects, an apparatus for wireless communication includes means for detecting the presence of a reference signal in a channel at a time instance of a desired reference signal; and means for selectively performing gating processing of the reference signal based on the detection of the presence of the reference signal in the channel.

[0011] As generally described herein with reference to the accompanying drawings and description, and as shown in the drawings and description, the various aspects typically include a method, apparatus, system, computer program product, non-transitory computer-readable medium, user equipment, base station, wireless communication equipment and / or processing system.

[0012] The features and technical advantages of the examples according to this disclosure have been extensively outlined above so that the following detailed description can provide a better understanding. Additional features and advantages will be described below. The disclosed concepts and specific examples can be readily used as the basis for modifying or designing other structures for achieving the same purpose of this disclosure. Such equivalent structures do not depart from the scope of the appended claims. The characteristics of the concepts disclosed herein (both their organization and manner of operation) and their associated advantages will be better understood from the following description when considered in conjunction with the accompanying drawings. Each drawing is provided for illustrative and descriptive purposes and not as a limitation of the claims.

[0013] Although aspects are described herein by way of example, those skilled in the art will understand that such aspects may be implemented in many different arrangements and scenarios. The techniques described herein can be implemented using different platform types, devices, systems, shapes, sizes, and / or package arrangements. For example, some aspects may be implemented via integrated chip embodiments or other devices based on non-modular components (e.g., end-user equipment, vehicles, communication equipment, computing devices, industrial equipment, retail / purchasing equipment, medical devices, and / or artificial intelligence devices). Aspects may be implemented in chip-level components, modular components, non-modular components, non-chip-level components, device-level components, and / or system-level components. Devices combining the described aspects and features may include additional components and features for implementing and practicing the claimed and described aspects. For example, the transmission and reception of wireless signals may include one or more components for analog and digital purposes (e.g., hardware components including antennas, radio frequency (RF) chains, power amplifiers, modulators, buffers, processors, interleavers, adders, and / or summers). It is intended that the aspects described herein be practiced in devices, components, systems, distributed arrangements, and / or end-user equipment of various sizes, shapes, and configurations. Attached Figure Description

[0014] Therefore, the foregoing features of this disclosure can be understood in detail by referring to various aspects for a more specific description, some of which are illustrated in the accompanying drawings. However, it should be noted that the drawings illustrate only certain typical aspects of this disclosure and should therefore not be considered as limiting its scope, as the description may allow for other equivalent aspects. The same reference numerals in different drawings may identify the same or similar elements.

[0015] Figure 1This is a diagram illustrating an example of a wireless network according to the present disclosure.

[0016] Figure 2 This is a diagram illustrating an example of communication between a base station and a user equipment (UE) in a wireless network according to the present disclosure.

[0017] Figure 3 This is a diagram illustrating an example of physical channels and reference signals in a wireless network according to the present disclosure.

[0018] Figure 4 This is a diagram illustrating an example of new radio (NR) communication in the unlicensed spectrum according to this disclosure.

[0019] Figure 5 This is a diagram illustrating examples of NR communication in multiple sub-bands of the unlicensed spectrum according to this disclosure.

[0020] Figure 6 This is a diagram illustrating an example of gating associated with the detection and processing of a reference signal in an unlicensed spectrum according to this disclosure.

[0021] Figure 7 This is a diagram illustrating Example 700 associated with Frequency Tracking Loop (FTL) processing based on Tracking Reference Signal (TRS) according to this disclosure.

[0022] Figure 8 This is a diagram illustrating an example process associated with gating of reference signal detection and reference signal processing in an unlicensed spectrum according to this disclosure.

[0023] Figure 9 This is a block diagram illustrating an example device for wireless communication according to the present disclosure. Detailed Implementation

[0024] Various aspects of this disclosure are described more fully below with reference to the accompanying drawings. However, this disclosure may be embodied in many different forms and should not be construed as limited to any particular structure or function presented throughout this disclosure. Rather, these aspects are provided so that this disclosure will be exhaustive and complete, and will fully convey the scope of this disclosure to those skilled in the art. Those skilled in the art will understand that the scope of this disclosure is intended to cover any aspect of the disclosure herein, whether implemented independently of or in combination with any other aspect of this disclosure. For example, an apparatus or method may be implemented using any number of aspects set forth herein. Additionally, the scope of this disclosure is intended to cover an apparatus or method practiced using other structures, functions, or structures and functions that include or exclude the aspects of this disclosure set forth herein. It should be understood that any aspect of this disclosure may be embodied by one or more elements of the claims.

[0025] Several aspects of a telecommunications system will now be presented with reference to various devices and techniques. These devices and techniques will be described in detail below and illustrated in the accompanying drawings by various blocks, modules, components, circuits, steps, processes, algorithms, etc. (collectively, “elements”). These elements can be implemented using hardware, software, or any combination thereof. Whether such an element is implemented as hardware or software depends on the specific application and the design constraints imposed on the entire system.

[0026] While the aspects may be described using terms commonly associated with 5G or New Radio (NR) Radio Access Technology (RAT), the aspects of this disclosure may be applied to other RATs, such as 3G RAT, 4G RAT, and / or RATs after 5G (e.g., 6G).

[0027] Figure 1This diagram illustrates an example of a wireless network 100 according to the present disclosure. In other examples, the wireless network 100 may be or may include elements of a 5G (e.g., NR) network and / or a 4G (e.g., Long Term Evolution (LTE)) network. The wireless network 100 may include one or more base stations 110 (shown as BS 110a, BS 110b, BS 110c, and BS 110d), user equipment (UE) 120 or multiple UEs 120 (shown as UE 120a, UE 120b, UE 120c, UE 120d, and UE 120e), and / or other network entities. Base station 110 is the entity that communicates with UE 120. Base station 110 (sometimes referred to as BS) may include, for example, an NR base station, an LTE base station, a Node B, an eNB (e.g., in 4G), a gNB (e.g., in 5G), an access point, and / or a Transmit / Receive Point (TRP). Each base station 110 may provide communication coverage for a specific geographic area. In the 3rd Generation Partnership Project (3GPP), depending on the context in which the term is used, the term “cell” can refer to the coverage area of ​​base station 110 and / or the base station subsystem serving that coverage area.

[0028] Base station 110 can provide communication coverage for macro cells, pico cells, femtocells, and / or other types of cells. A macro cell can cover a relatively large geographic area (e.g., a radius of several kilometers) and can allow unrestricted access by UE 120 with service subscriptions. A pico cell can cover a relatively small geographic area and can allow unrestricted access by UE 120 with service subscriptions. A femtocell can cover a relatively small geographic area (e.g., a home) and can allow restricted access by UE 120 associated with that femtocell (e.g., UE 120 in a Closed Subscriber Group (CSG)). Base station 110 for macro cells can be referred to as a macro base station. Base station 110 for pico cells can be referred to as a pico base station. Base station 110 for femtocells can be referred to as a femtocell or a home base station. Figure 1 In the example shown, BS 110a can be a macro base station for macro cell 102a, BS 110b can be a pico base station for pico cell 102b, and BS 110c can be a femto base station for femto cell 102c. A base station can support one or more (e.g., three) cells.

[0029] In some examples, the cell may not have to be fixed, and the geographical area of ​​the cell may move depending on the location of the mobile base station 110 (e.g., a mobile base station). In some examples, base station 110 may interconnect with each other and / or with one or more other base stations 110 or network nodes (not shown) in the wireless network 100 via various types of backhaul interfaces (such as direct physical connections or virtual networks using any suitable transport network).

[0030] The wireless network 100 may include one or more relay stations. A relay station is an entity that can receive data transmissions from an upstream station (e.g., base station 110 or UE 120) and transmit the data to a downstream station (e.g., UE 120 or base station 110). A relay station may be a UE 120 capable of relaying the transmissions of other UEs 120. Figure 1 In the example shown, BS 110d (e.g., a relay base station) can communicate with BS 110a (e.g., a macro base station) and UE 120d to facilitate communication between BS 110a and UE 120d. The base station 110 for relay communication can be referred to as a relay station, relay base station, relay, or the like.

[0031] Wireless network 100 can be a heterogeneous network, comprising different types of base stations 110, such as macro base stations, pico base stations, femto base stations, relay base stations, or the like. These different types of base stations 110 may have different transmit power levels, different coverage areas, and / or different effects on interference in wireless network 100. For example, macro base stations may have high transmit power levels (e.g., 5 to 40 watts), while pico base stations, femto base stations, and relay base stations may have lower transmit power levels (e.g., 0.1 to 2 watts).

[0032] The network controller 130 can be coupled to or communicate with a group of base stations 110, and can provide coordination and control for these base stations 110. The network controller 130 can communicate with the base stations 110 via a backhaul communication link. The base stations 110 can communicate with each other directly or indirectly via wireless or wired backhaul communication links.

[0033] UE 120 may be distributed throughout the wireless network 100, and each UE 120 may be stationary or mobile. UE 120 may include, for example, access terminals, terminals, mobile stations, and / or subscriber units. UE 120 may be a cellular phone (e.g., a smartphone), a personal digital assistant (PDA), a wireless modem, a wireless communication device, a handheld device, a laptop computer, a cordless phone, a wireless local loop (WLL) station, a tablet computer, a camera, a gaming device, a netbook, a smartbook, an ultrabook, a medical device, a biometric device, a wearable device (e.g., a smartwatch, smart clothing, smart glasses, a smart wristband, smart jewelry (e.g., a smart ring, a smart bracelet)), an entertainment device (e.g., a music device, a video device, and / or a satellite radio unit), a vehicle component or sensor, a smart meter / sensor, industrial manufacturing equipment, a GPS device, and / or any other suitable device configured to communicate via a wireless medium.

[0034] Some UEs 120 can be considered Machine-Type Communication (MTC) or Evolved or Enhanced Machine-Type Communication (eMTC) UEs. MTC UEs and / or eMTC UEs may include, for example, robots, drones, remote devices, sensors, meters, monitors, and / or location tags, which can communicate with a base station, another device (e.g., a remote device), or some other entity. Some UEs 120 can be considered Internet of Things (IoT) devices and / or may be implemented as NB-IoT (Narrowband IoT) devices. Some UEs 120 can be considered customer premises equipment. UEs 120 may be included within a housing that houses the components of the UE 120, such as processor components and / or memory components. In some examples, the processor components and memory components may be coupled together. For example, the processor components (e.g., one or more processors) and memory components (e.g., memory) may be operatively coupled, communicatively coupled, electronically coupled, and / or electrically coupled.

[0035] Typically, any number of wireless networks 100 can be deployed in a given geographical area. Each wireless network 100 can support a specific RAT and can operate on one or more frequencies. A RAT can be referred to as a radio technology, air interface, etc. A frequency can be referred to as a carrier, frequency channel, etc. Each frequency can support a single RAT in a given geographical area to avoid interference between wireless networks using different RATs. In some cases, NR or 5G RAT networks can be deployed.

[0036] In some examples, two or more UEs 120 (e.g., shown as UE 120a and UE 120e) may communicate directly using one or more sidelink channels (e.g., without using base station 110 as an intermediary for communication with each other). For example, UE 120 may communicate using peer-to-peer (P2P) communication, device-to-device (D2D) communication, vehicle-to-everything (V2X) protocols (e.g., which may include vehicle-to-vehicle (V2V), vehicle-to-infrastructure (V2I), or vehicle-to-pedestrian (V2P) protocols) and / or mesh networks. In such examples, UE 120 may perform scheduling operations, resource selection operations, and / or other operations as described elsewhere herein, as performed by base station 110.

[0037] Devices in Wireless Network 100 can communicate using the electromagnetic spectrum, which can be subdivided into various categories, bands, channels, etc., based on frequency or wavelength. For example, devices in Wireless Network 100 can communicate using one or more operating frequency bands. In 5G NR, two initial operating frequency bands have been designated as frequency ranges FR1 (410 MHz – 7.125 GHz) and FR2 (24.25 GHz – 52.6 GHz). It should be understood that although a portion of FR1 is greater than 6 GHz, FR1 is often (interchangeably) referred to as the “sub-6 GHz” band in various documents and articles. Similar naming issues sometimes arise with FR2; although different from the Extremely High Frequency (EHF) band (30 GHz – 300 GHz) recognized as a “millimeter wave” band by the International Telecommunication Union (ITU), FR2 is often (interchangeably) referred to as the “millimeter wave” band in documents and articles.

[0038] The frequencies between FR1 and FR2 are generally referred to as mid-band frequencies. Recent 5G NR studies have designated the operating frequency bands of these mid-band frequencies as the frequency range designation FR3 (7.125 GHz – 24.25 GHz). Frequency bands falling within FR3 can inherit FR1 and / or FR2 characteristics, and thus can effectively extend the characteristics of FR1 and / or FR2 to mid-band frequencies. Furthermore, higher frequency bands are currently being explored to extend 5G NR operation above 52.6 GHz. For example, three higher operating frequency bands have been designated as the frequency range designations FR4a or FR4-1 (52.6 GHz – 71 GHz), FR4 (52.6 GHz – 114.25 GHz), and FR5 (114.25 GHz – 300 GHz). Each of these higher frequency bands falls within the EHF band.

[0039] Considering the examples above, unless otherwise explicitly stated, it should be understood that the terms "sub-6 GHz" and the like (if used herein) can broadly refer to frequencies that may be less than 6 GHz, frequencies that may be within FR1, or frequencies that may include mid-band frequencies. Furthermore, unless otherwise explicitly stated, it should be understood that the terms "millimeter wave" and the like (if used herein) can broadly refer to frequencies that may include mid-band frequencies, frequencies that may be within FR2, FR4, FR4-a, or FR4-1 and / or FR5, or frequencies that may be within the EHF band. Consider that the frequencies included in these operating bands (e.g., FR1, FR2, FR3, FR4, FR4-a, FR4-1, and / or FR5) can be modified, and the techniques described herein are applicable to those modified frequency ranges.

[0040] As indicated above, provide Figure 1 As an example. Other examples can be related to... Figure 1 The descriptions are different.

[0041] Figure 2 This diagram illustrates an example 200 of communication between a base station 110 and a UE 120 in a wireless network 100 according to the present disclosure. The base station 110 may be equipped with a set of antennas 234a to 234t, such as T antennas (T≥1). The UE 120 may be equipped with a set of antennas 252a to 252r, such as R antennas (R≥1).

[0042] At base station 110, transmitting processor 220 can receive data for UE 120 (or a group of UEs 120) from data source 212. Transmitting processor 220 can select one or more modulation and coding schemes (MCS) for UE 120, at least in part, based on one or more Channel Quality Indicators (CQIs) received from UE 120. Base station 110 can process (e.g., code and modulate) the data for UE 120, at least in part, based on the one or more MCSs selected for UE 120, and can provide data symbols for UE 120. Transmitting processor 220 can process system information (e.g., semi-static resource partitioning information (SRPI)) and control information (e.g., CQI requests, grants, and / or upper-layer signaling), and provide overhead symbols and control symbols. Transmitting processor 220 can generate reference symbols for reference signals (e.g., cell-specific reference signals (CRS) or demodulation reference signals (DMRS)) and synchronization signals (e.g., primary synchronization signal (PSS) or secondary synchronization signal (SSS)). The transmit (TX) multiple-input multiple-output (MIMO) processor 230 can perform spatial processing (e.g., precoding, if applicable) on data symbols, control symbols, overhead symbols, and / or reference symbols, and can provide a set of output symbol streams (e.g., T output symbol streams) to a corresponding set of modems 232 (e.g., T modems), as shown in modems 232a to 232t. For example, each output symbol stream can be provided to the modulator component (shown as MOD) of modem 232. Each modem 232 can process its own output symbol stream (e.g., for OFDM) using its respective modulator component to obtain an output sample stream. Each modem 232 can further process (e.g., convert to analog, amplify, filter, and / or up-convert) the output sample stream using its respective modulator component to obtain a downlink signal. Modems 232a to 232t can transmit a set of downlink signals (e.g., T downlink signals) via a corresponding set of antennas 234 (e.g., T antennas) (shown as antennas 234a to 234t).

[0043] At UE 120, a set of antennas 252 (shown as antennas 252a to 252r) can receive downlink signals from base station 110 and / or other base stations 110, and can provide a set of received signals (e.g., R received signals) to a set of modems 254 (e.g., R modems), shown as modems 254a to 254r. For example, each received signal can be provided to a demodulator component (shown as DEMOD) of modem 254. Each modem 254 can use its respective demodulator component to condition (e.g., filter, amplify, downconvert, and / or digitize) the received signal to obtain an input sample. Each modem 254 can further process the input sample (e.g., for OFDM) using its demodulator component to obtain a received symbol. MIMO detector 256 can obtain the received symbols from modem 254, perform MIMO detection on the received symbols if applicable, and can provide the detected symbols. The receiver processor 258 can process (e.g., demodulate and decode) the detected symbols, provide decoded data for the UE 120 to the data sink 260, and provide decoded control and system information to the controller / processor 280. The term "controller / processor" can refer to one or more controllers, one or more processors, or a combination thereof. The channel processor can determine parameters such as the Reference Signal Received Power (RSRP), Received Signal Strength Indicator (RSSI), Reference Signal Received Quality (RSRQ), and / or CQI. In some examples, one or more components of the UE 120 may be included in the housing 284.

[0044] Network controller 130 may include communication unit 294, controller / processor 290, and memory 292. Network controller 130 may include one or more devices, such as those in a core network. Network controller 130 may communicate with base station 110 via communication unit 294.

[0045] One or more antennas (e.g., antennas 234a to 234t and / or antennas 252a to 252r) may include or be included within one or more antenna panels, one or more antenna groups, one or more sets of antenna elements, and / or one or more antenna arrays. Antenna panels, antenna groups, sets of antenna elements, and / or antenna arrays may include one or more antenna elements (within a single housing or multiple housings), a set of coplanar antenna elements, a set of non-coplanar antenna elements, and / or one or more antenna elements coupled to one or more transmitting and / or receiving components, such as... Figure 2 One or more components.

[0046] On the uplink, at UE 120, the transmit processor 264 can receive and process data from data source 262 and control information from controller / processor 280 (e.g., reports including RSRP, RSSI, RSRQ, and / or CQI). The transmit processor 264 can generate reference symbols for one or more reference signals. The symbols from the transmit processor 264 can be pre-encoded by the TX MIMO processor 266 (if applicable), further processed by the modem 254 (e.g., for DFT-s-OFDM or CP-OFDM), and transmitted to base station 110. In some examples, the modem 254 of UE 120 may include a modulator and demodulator. In some examples, UE 120 includes a transceiver. The transceiver may include any combination of one or more antennas 252, one or more modems 254, MIMO detector 256, receive processor 258, transmit processor 264, and / or TX MIMO processor 266. The transceiver can be used by a processor (e.g., controller / processor 280) and memory 282 to perform any aspect of the methods described herein (e.g., references). Figures 6 to 9 ).

[0047] At base station 110, uplink signals from UE 120 and / or other UEs can be received by antenna 234, processed by modem 232 (e.g., demodulator component of modem 232, shown as DEMOD), detected by MIMO detector 236 (if applicable), and further processed by receive processor 238 to obtain decoded data and control information from UE 120. Receive processor 238 can provide the decoded data to data sink 239 and the decoded control information to controller / processor 240. Base station 110 may include communication unit 244 and can communicate with network controller 130 via communication unit 244. Base station 110 may include scheduler 246 for scheduling one or more UEs 120 for downlink and / or uplink communication. In some examples, modem 232 of base station 110 may include modulator and demodulator. In some examples, base station 110 includes transceiver. The transceiver may include any combination of one or more antennas 234, one or more modems 232, MIMO detector 236, receive processor 238, transmit processor 220, and / or TX MIMO processor 230. The transceiver may be used by a processor (e.g., controller / processor 240) and memory 242 to perform aspects of any of the methods described herein (e.g., references). Figures 6 to 9 ).

[0048] As described in more detail elsewhere in this document, the controller / processor 240 of base station 110, the controller / processor 280 of UE 120, and / or Figure 2 Any other one or more components may perform one or more techniques associated with gating of reference signal detection and reference signal processing in the unlicensed spectrum. For example, the controller / processor 240 of base station 110, the controller / processor 280 of UE 120, and / or Figure 2 Any other one or more components can perform or direct, for example Figure 8 The process 800 operates and / or other processes as described herein. Memory 242 and memory 282 may store data and program code for base station 110 and UE 120, respectively. In some examples, memory 242 and / or memory 282 may include a non-transitory computer-readable medium storing one or more instructions (e.g., code and / or program code) for wireless communication. For example, when executed by one or more processors of base station 110 and / or UE 120 (e.g., directly executed, or compiled, translated, and / or interpreted before execution), one or more instructions may cause the one or more processors, UE 120, and / or base station 110 to perform or direct, for example... Figure 8 The operation of process 800, and / or other processes described herein. In some examples, execution instructions may include run instructions, transformation instructions, compilation instructions, and / or interpretation instructions, etc.

[0049] In some aspects, UE 120 includes components for detecting the presence of a reference signal in the channel at a desired time instance; and / or components for selectively performing reference signal gating processing based on the detection of the presence of the reference signal in the channel. Components for UE 120 to perform the operations described herein may include one or more of, for example, an antenna 252, a demodulator 254, a MIMO detector 256, a receive processor 258, a transmit processor 264, a TXMIMO processor 266, a modulator 254, a controller / processor 280, or a memory 282.

[0050] In some respects, UE 120 includes components for detecting the presence of a reference signal in the channel by comparing signal measurements on at least one sub-band of the channel with a threshold.

[0051] In some respects, UE 120 includes components for detecting the time instance of a desired reference signal and whether the reference signal exists in the channel in the time domain.

[0052] In some respects, UE 120 includes components for measuring signal measurements on the channel in the time domain; and / or components for comparing signal measurements on the channel in the time domain with time domain signal measurement thresholds.

[0053] In some respects, UE 120 includes components for: gating a reference signal, at least in part, based on the detection that the reference signal is not present in the time domain, to be used entirely for the occurrence of a reference signal associated with a time instance of the desired reference signal.

[0054] In some respects, UE 120 includes components for detecting the presence of a reference signal in the frequency domain of each of a plurality of sub-bands in the channel.

[0055] In some aspects, UE 120 includes components for measuring corresponding signal measurements in the frequency domain of each of a plurality of sub-bands; and / or components for comparing corresponding signal measurements in the frequency domain of each of the plurality of sub-bands with a frequency domain signal measurement threshold.

[0056] In some respects, UE 120 includes components for operating such that: based at least in part on the detection that a reference signal is not present in the frequency domain of at least one of a plurality of sub-bands, gating the reference signal for use entirely with the occurrence of a reference signal associated with a time instance of the desired reference signal.

[0057] In some aspects, UE 120 includes components for processing a reference signal at least in part based on the detection that the reference signal does not exist in the frequency domain of at least one of the plurality of sub-bands, using a portion of the reference signal that exists in the frequency domain of one or more sub-bands.

[0058] In some aspects, UE 120 includes components for detecting whether a reference signal exists in the channel in the time domain at a time instance of a desired reference signal; and / or components for detecting whether a reference signal exists in the frequency domain of each of a plurality of sub-bands of the channel, based at least in part on the determination that the reference signal exists in the channel in the time domain.

[0059] In some respects, UE 120 includes components for performing reference signal gating based on the detection that a reference signal is not present in the channel, in order to facilitate the occurrence of a reference signal associated with a time instance of the desired reference signal.

[0060] In some respects, UE 120 includes components for operating such that, for a filter having filter values ​​that are at least partially based on the processing of a reference signal, the current value of the filter value is prevented from changing based on the occurrence of a reference signal associated with a time instance of the desired reference signal.

[0061] In some respects, UE 120 includes components for receiving from a base station an indication of scheduling a time instance of a desired reference signal prior to the time instance of the desired reference signal.

[0062] Although Figure 2 The boxes in the diagram are shown as different components, but the functions described above with respect to these boxes may be implemented in a single hardware, software, or combined component, or in various combinations of components. For example, the functions described with respect to transmit processor 264, receive processor 258, and / or TX MIMO processor 266 may be performed by or under the control of controller / processor 280.

[0063] As indicated above, provide Figure 2 As an example. Other examples can be related to... Figure 2 The descriptions are different.

[0064] Figure 3 This is a diagram illustrating example 300 of a physical channel and reference signal in a wireless network according to this disclosure. Figure 3 As shown, the downlink channel and downlink reference signal can carry information from base station 110 to UE 120, and the uplink channel and uplink reference signal can carry information from UE 120 to base station 110.

[0065] As shown in the figure, downlink channels may include a Physical Downlink Control Channel (PDCCH) for transmitting downlink control information (DCI), a Physical Downlink Shared Channel (PDSCH) for transmitting downlink data, or a Physical Broadcast Channel (PBCH) for transmitting system information, etc. In some aspects, PDSCH communication can be scheduled through PDCCH communication. Further as shown in the figure, uplink channels may include a Physical Uplink Control Channel (PUCCH) for transmitting uplink control information (UCI), a Physical Uplink Shared Channel (PUSCH) for transmitting uplink data, or a Physical Random Access Channel (PRACH) for initial network access, etc. In some aspects, UE 120 may send acknowledgment (ACK) or negative acknowledgment (NACK) feedback (e.g., ACK / NACK feedback or ACK / NACK information) in the UCI on the PUCCH and / or PUSCH.

[0066] As further shown in the figure, downlink reference signals may include synchronization signal blocks (SSBs), channel state information (CSI) reference signals (CSI-RS), DMRS, positioning reference signals (PRS), or phase tracking reference signals (PTRS), etc. As also shown in the figure, uplink reference signals may include sounding reference signals (SRS), DMRS, or PTRS, etc.

[0067] SSBs can carry information for initial network acquisition and synchronization, such as PSS, SSS, PBCH, and PBCH DMRS. SSBs are sometimes referred to as synchronization signal / PBCH (SS / PBCH) blocks. In some respects, base station 110 can transmit multiple SSBs on multiple corresponding beams, and SSBs can be used for beam selection.

[0068] CSI-RS can transmit information for downlink channel estimation (e.g., downlink CSI acquisition), which can be used for scheduling, link adaptation, or beam management. Base station 110 can configure a set of CSI-RS for UE 120, and UE 120 can measure this configured set of CSI-RS. Based at least in part on the measurement results, UE 120 can perform channel estimation and report channel estimation parameters to base station 110 (e.g., in a CSI report), such as CQI, precoding matrix indicator (PMI), CSI-RS resource indicator (CRI), layer indicator (LI), rank indicator (RI), or RSRP. Base station 110 can use the CSI report to select transmission parameters for downlink communication to UE 120, such as the number of transport layers (e.g., rank), precoding matrix (e.g., precoder), MCS, or refined downlink beams (e.g., using a beam refinement process or beam management process). Tracking reference signal (TRS) can carry information for time and frequency tracking for UE 120. TRS can be configured using specific CSI-RS configurations.

[0069] DMRS can transmit information used to estimate radio channels used for demodulating relevant physical channels (e.g., PDCCH, PDSCH, PBCH, PUCCH, or PUSCH). The design and mapping of DMRS can be specific to the physical channel, and DMRS is used to estimate that physical channel. DMRS is UE-specific, can be beamformed, can be restricted to scheduled resources (e.g., instead of being transmitted over broadband), and can only be transmitted when necessary. As shown in the figure, DMRS is used for both downlink and uplink communication.

[0070] PTRS can transmit information used to compensate for oscillator phase noise. Typically, phase noise increases with the oscillator carrier frequency. Therefore, PTRS can be used at high carrier frequencies, such as millimeter-wave frequencies, to mitigate phase noise. PTRS can be used to track the phase of a local oscillator and can suppress phase noise and common phase error (CPE). As shown, PTRS is used for downlink communication (e.g., on PDSCH) and uplink communication (e.g., on PUSCH).

[0071] The PRS can carry information for timing or ranging measurements of the UE 120 based on signals transmitted by base station 110, to improve observed time difference of arrival (OTDOA) positioning performance. For example, the PRS can be a pseudo-random quadrature phase shift keying (QPSK) sequence mapped in a diagonal pattern with frequency and time shifts to avoid conflicts with cell-specific reference signals and control channels (e.g., PDCCH). Typically, the PRS can be designed to improve the detectability of the UE 120, which may need to detect downlink signals from multiple neighboring base stations to perform OTDOA-based positioning. Therefore, the UE 120 can receive PRS from multiple cells (e.g., a reference cell and one or more neighboring cells) and can report the reference signal time difference (RSTD) based on OTDOA measurements associated with the PRS received from the multiple cells. In some aspects, base station 110 can then calculate the location of the UE 120 based on the RSTD measurements reported by the UE 120.

[0072] SRS can transmit information for uplink channel estimation, which can be used for scheduling, link adaptation, precoder selection, or beam management. Base station 110 can configure one or more SRS resource sets for UE 120, and UE 120 can transmit SRS on the configured SRS resource sets. SRS resource sets can have configured uses, such as uplink CSI acquisition, downlink CSI acquisition for reciprocal operations, and uplink beam management. Base station 110 can measure SRS, perform channel estimation at least in part based on the measurement results, and use the SRS measurement results to configure communication with UE 120.

[0073] As indicated above, provide Figure 3 As an example. Other examples can be related to... Figure 3 The descriptions are different.

[0074] Figure 4 This is a diagram illustrating example 400 of NR communication in an unlicensed spectrum according to this disclosure.

[0075] In shared or unlicensed frequency bands, transmitting devices can compete with other devices for channel access before transmitting on a shared or unlicensed channel to reduce and / or prevent collisions on the shared or unlicensed channel. To compete for channel access, transmitting devices can perform channel access procedures, such as a Listen-Before-Speak (LBT) procedure or another type of channel access procedure for shared or unlicensed frequency band channel access. The channel access procedure can be performed to determine whether a physical channel (e.g., the radio resources of the channel) is freely available or busy (e.g., used by another wireless communication device such as a UE, IoT device, or wireless local area network (WLAN) device). The channel access procedure may include sensing or measuring the physical channel during a channel access gap (also known as a contention window (CW)) (e.g., performing RSRP measurements, detecting energy levels, or performing another type of measurement), and determining whether the shared or unlicensed channel is idle or busy based at least in part on signals sensed or measured on the physical channel (e.g., at least in part on whether the measured value meets a threshold). If the transmitting device determines that the channel access procedure is successful, the transmitting device may perform one or more transmissions on a shared or unlicensed channel during a Transmission Opportunity (TXOP), which may extend the Channel Occupancy Time (COT).

[0076] A base station may perform one or more LBT procedures before transmitting downlink communication to a UE in unlicensed spectrum. If an LBT procedure fails, the base station may delay transmitting downlink communication in the unlicensed spectrum until the LBT procedure is successfully executed. Figure 4 As shown, prior to the first time slot, the base station may perform a first LBT procedure 405 on the channel in unlicensed spectrum, and the first LBT procedure 405 may fail. Therefore, the base station may not initiate downlink communication transmission on the channel at the beginning of the first time slot. During the first time slot, the base station may perform a second LBT procedure 410 on the channel, and the second LBT procedure 410 may succeed. The base station may then initiate channel occupancy on the channel based on the success of the second LBT procedure 410, and the base station may transmit downlink communication to the UE on the channel during the COT associated with channel occupancy. For example, as shown in Example 400, the COT associated with channel occupancy may include the remainder of the first time slot and a second time slot.

[0077] In some examples, the base station may transmit a reference signal, such as CSI-RS or TRS, via a channel in unlicensed spectrum. For example, the reference signal may be a periodic reference signal and / or a semi-persistent scheduling reference signal. However, the scheduling time instance used to transmit the reference signal may not fall within channel occupancy. For example, the scheduling time instance may fall between an unsuccessful LBT process (e.g., the first LBT process 405) and a successful LBT process (e.g., the second LBT process 410). In this case, the base station may not transmit the reference signal on the channel during the scheduling time instance.

[0078] As indicated above, provide Figure 4 As an example. Other examples may differ from those regarding... Figure 4 The example described.

[0079] Figure 5 This is a diagram illustrating example 500 of NR communication in multiple sub-bands of unlicensed spectrum according to this disclosure.

[0080] like Figure 5 As shown, transmitting devices, such as base stations, can perform LBT (Local Bit Transmission) for multiple sub-bands in unlicensed spectrum. For example, in the 3GPP standard, LBT can be performed on a 20 MHz sub-band for transmission in unlicensed spectrum. When a base station transmits downlink communication to a UE on a channel in unlicensed spectrum, and the bandwidth portion (BWP) used for downlink communication is greater than 20 MHz, the base station can transmit only in the 20 MHz band where the LBT process is successfully completed. This may result in one or more 20 MHz holes in the frequency domain of downlink communication. As used herein, a “hole” in the frequency domain refers to one or more sub-bands in which a reference signal is not transmitted.

[0081] like Figure 5 As shown, downlink transmissions, such as reference signals, can have a BWP of 80 MHz. In this case, the base station can attempt to allocate four 20 MHz sub-bands in the unlicensed spectrum for transmitting downlink communication. For each sub-band, the base station can perform a corresponding LBT procedure and allocate a portion of the sub-band for transmitting downlink communication based on the success of the LBT procedure within that sub-band. However, if the LBT procedure in a sub-band fails, the base station may not allocate a portion of the sub-band for transmitting downlink communication. For example, as... Figure 5 As shown, one of the 20 MHz sub-bands was not assigned because the LBT process in the sub-band was not completed.

[0082] As indicated above, provide Figure 5 As an example. Other examples may differ from those regarding... Figure 5 The example described.

[0083] The UE may expect to receive a reference signal, such as CSI-RS or TRS, from the base station on a channel in unlicensed spectrum at a certain time instance. For example, the reference signal may be a periodic or semi-persistent scheduling reference signal. However, if the LBT procedure performed by the base station before transmitting the reference fails for the entire bandwidth or for one or more sub-bands, the base station may not transmit all or one or more portions of the reference signal (e.g., in the 20 MHz sub-band). If the reference signal is outside the COT associated with the channel occupancy initiated by the base station, or if the base station does not transmit at least one sub-band, the UE may ignore the reference signal. In some cases, the base station may transmit information indicating the availability of the COT and the 20 MHz sub-band to the UE via DCI 2.0. However, DCI 2.0 is an optional feature. Therefore, in some cases, DCI 2.0 may not be transmitted by the base station and / or may not be supported by the UE.

[0084] If the base station does not transmit DCI 2.0 and / or the UE does not support DCI 2.0, the UE will not receive information indicating whether the reference signal is within channel occupancy and / or whether the base station has not transmitted the reference signal in one or more sub-bands due to an unsuccessful LBT procedure. If the UE expects to receive the reference signal at a certain time instance, and the UE is unaware that the reference signal has not yet been transmitted or that a hole exists in the frequency domain, all processing performed by the UE based on that reference signal may be inaccurate. For example, in the case of periodic or semi-persistent CSI-RS, channel state feedback (CSF) processing based on CSI-RS may be inaccurate. In the case of periodic or semi-persistent TRS, frequency and time tracking loops based on TRS processing may be inaccurate. This may degrade the quality, speed, and reliability of communication between the base station and the UE.

[0085] The techniques and apparatus described herein enable a UE to detect the presence of a reference signal in the channel at a desired time instance. The UE can selectively perform reference signal gating based at least in part on the detection of the reference signal's presence in the channel. Therefore, when the reference signal is not transmitted in a time instance and / or has a aperture in the frequency domain, the UE can avoid inaccurate processing, such as CSF processing and / or TRS processing for frequency and time tracking loops. This can potentially increase the quality, speed, and reliability of communication between the UE and the base station.

[0086] Figure 6 This is a diagram illustrating an example 600 associated with gating of reference signal detection and reference signal processing in an unlicensed spectrum according to this disclosure. Figure 6As shown, Example 600 includes communication between base station 110 and UE 120. In some aspects, base station 110 and UE 120 may be included in a wireless network (such as wireless network 100). Base station 110 and UE 120 may communicate via a radio access link, which may include an uplink and a downlink.

[0087] like Figure 6 As shown, and by reference numeral 605, base station 110 can transmit a reference signal to UE 120. In some aspects, base station 110 can transmit the reference signal on a channel in unlicensed spectrum at the time instance when UE 120 expects the reference signal. In some aspects, the reference signal may be CSI-RS. In some aspects, the reference signal may be TRS. In some aspects, the reference signal may be SSB.

[0088] In some aspects, the reference signal can be a periodic reference signal or a semi-persistent scheduling reference signal. In this case, the expected time instance of the reference signal can be based at least in part on the periodicity of the reference signal. In some aspects, the expected time of the reference signal can be based at least in part on communications, such as Radio Resource Control (RRC) messages, which schedule one or more time instances (e.g., periodically occurring time instances) for the occurrence of the reference signal. For example, UE 120 can receive an RRC message from base station 110, which includes a periodic semi-persistent scheduling (SPS) configuration indicating the occurrence of the reference signal.

[0089] Base station 110 may perform one or more LBT procedures before transmitting a reference signal on a channel in unlicensed spectrum. In some aspects, base station 110 may perform a corresponding LBT procedure for each of a plurality of sub-bands (e.g., a 20 MHz sub-band) in the unlicensed spectrum. In some aspects, base station 110 may not transmit the reference signal at a time instance in which UE 120 expects the reference signal. For example, if the time instance in which the expected reference signal falls outside a channel occupancy initiated by base station 110, at least in part based on an unsuccessful LBT procedure, base station 110 may not transmit the reference signal. In some aspects, base station 110 may transmit a reference signal with one or more apertures in the frequency domain. For example, base station 110 may not transmit portions of the reference signal in one or more sub-bands, at least in part based on corresponding unsuccessful LBT procedures in one or more sub-bands.

[0090] like Figure 6As further shown herein, and by reference numeral 610, UE 120 can detect the presence of a reference signal in the channel at a time instance of the desired reference signal. In some aspects, UE 120 can determine the presence of a reference signal in the channel based at least in part on one or more signal measurements on the channel. For example, UE 120 can determine the presence of a reference signal based on one or more measurements of the received signal-to-noise ratio (SNR) on the channel, one or more measurements of the received power (e.g., RSRP) on the channel, or a combination thereof. Figure 6 As described in Example 600, UE 120 may use an SNR measurement to determine the presence of a reference signal in the channel. However, in some respects, UE 120 may use other signal measurements, such as a received power measurement, instead of an SNR measurement or a measurement other than an SNR measurement.

[0091] UE 120 can detect the presence of a signal in the channel in the time domain, and / or UE 120 can detect the presence of a signal in multiple sub-bands in the frequency domain. In some aspects, UE 120 can detect whether a signal is present in the channel or not present in the channel at all in the time domain, and UE 120 can detect the presence of a signal in each sub-band in the frequency domain based on the detection that the signal is present in the channel in the frequency domain (e.g., not completely absent).

[0092] In some aspects, UE 120 can detect the presence of a signal in the time domain based on a time-domain SNR measurement. UE 120 can measure the received SNR on the channel in the time domain at the time instance of the desired reference signal. For example, UE 120 can measure the time-domain SNR over the entire frequency range of the channel. UE 120 can compare the time-domain SNR measurement with a first threshold (e.g., a time-domain SNR threshold). UE 120 can detect the presence of a reference signal in the channel in the time domain based on a determination that the time-domain SNR measurement meets the first threshold. UE 120 can detect the absence (e.g., complete absence) of a reference signal in the channel in the time domain based on a determination that the time-domain SNR does not meet the first threshold.

[0093] In some aspects, UE 120 can detect the presence of a reference signal in the frequency domain of each of multiple sub-bands in the channel. For example, UE 120 can detect the presence of a reference signal in each of multiple 20 MHz sub-bands. UE 120 can measure the corresponding SNR in the frequency domain for each sub-band. For example, the SNR measured for a sub-band can be the received SNR on that sub-band. For each sub-band, UE 120 can compare the corresponding frequency domain SNR measurement for that sub-band with a second threshold (e.g., a frequency domain SNR threshold). UE 120 can detect the presence of a reference signal in the frequency domain of a sub-band based on a determination that the frequency domain SNR measurement for the sub-band meets the second threshold. UE 120 can detect the absence of a reference signal in the frequency domain of a sub-band based on a determination that the frequency domain SNR measurement for the sub-band does not meet the threshold. In some aspects, UE 120 can determine that the reference signal has one or more holes in the frequency domain corresponding to the reference signal, which does not exist in one or more sub-bands of the sub-band. For example, UE 120 can determine that the reference signal exists in one or more sub-bands of the sub-band, and UE 120 can determine that the reference signal does not exist in at least one sub-band.

[0094] like Figure 6 Further, as shown and by reference numeral 615, the UE 120 can selectively perform reference signal gating based on detecting the presence of a reference signal in the channel. In some aspects, at least for the occurrence of a reference signal associated with a time period of the desired reference signal, the UE 120 can perform reference signal gating by preventing processing of the reference signal and freezing measurements, estimations, and / or calculations performed at least partially based on processing the reference signal. In some aspects, the UE 120 can perform reference signal gating at least partially based on detecting that the reference signal is not present in the channel in the time domain or that the reference signal is not present in at least one sub-frequency band in the frequency domain. In some aspects, the UE 120 can stop reference signal gating at least partially based on detecting the presence of the reference signal in the channel at a subsequent time instance associated with the subsequent occurrence of the reference signal.

[0095] In some aspects, UE 120 may perform fully gated processing of the reference signal for the occurrence of a reference signal associated with a time instance of the desired reference signal, based at least in part on the detection that the reference signal does not exist in the channel in the time domain. In some aspects, UE 120 may fully gate the processing of the reference signal for the occurrence of a reference signal associated with a time instance of the desired reference signal, based at least in part on the detection that the reference signal does not exist in the frequency domain of at least one of a plurality of sub-bands. In some aspects, when a reference signal is detected to exist in the frequency domain of one or more sub-bands and a reference signal is detected not to exist in the frequency domain of at least one sub-band, UE 120 may process the reference signal using a portion of the reference signal detected to exist in one or more sub-bands.

[0096] UE 120 can continuously adjust the filter values ​​of one or more filters based on the periodic occurrence of a reference signal. For example, UE 120 can adjust the filter values ​​of a filter used for Doppler estimation, a filter used for spectral efficiency estimation, and / or other filters continuously updated by UE 120 based on the periodic occurrence of CSI-RS and / or TRS. In some aspects, when UE 120 gates the processing of a reference signal in response to its occurrence, UE 120 can prevent the current filter value of a filter from changing based on the processing of the reference signal. For example, for each filter having filter values ​​at least partially based on the processed reference signal, UE 120 can freeze the filter value at its current filter value.

[0097] In some respects, when gating the presence of CSI-RS, UE 120 may prevent CSF reporting based on the processing of CSI-RS. For example, UE 120 may prevent the calculation and / or reporting (e.g., in CSI reports) of channel estimation parameters, such as CQI, PMI, CRI, LI, RI, or RSRP, to base station 110, at least in part, based on the presence of CSI-RS.

[0098] In some respects, when gating the occurrence of a TRS, UE 120 can prevent cyclic processing of time and frequency tracking based on the occurrence of a TRS. In some respects, when gating the occurrence of an SSB, UE 120 can prevent cyclic processing of time and frequency tracking based on the occurrence of an SSB.

[0099] In some aspects, UE 120 can protect processing loops based on CSI-RS and / or TRS, where filter adjustments are performed using estimation or detection metrics based on reference signals. In some aspects, UE 120 can utilize partial CSI-RS and / or TRS information present in one or more sub-bands by modifying the estimation or detection metrics and adjusting filter weights to take the modified metrics into account, at least partially based on partial CSI-RS information. In some aspects, UE 120 can freeze filter states for lost or partially lost CSI-RS or TRS while reporting previous results. An example of protecting Doppler estimation / filtering is described herein.

[0100] In TRS-based Doppler estimation, UE 120 can process frequency-domain TRS symbols to obtain raw channel and noise estimates, compute Doppler log-likelihood (LL) metrics for multiple Doppler / SNR hypotheses (e.g., in a 2D search grid), perform infinite impulse response (IIR) filtering on the Doppler LL metrics using filters and the state of each hypothesis, perform a 2D search for the maximum Doppler LL over all hypotheses, and report the most likely Doppler bin (e.g., the winning Doppler shift frequency (fD)). UE 120 can input frequency-domain TRS symbols within a TRS burst. For example, a TRS burst can include one or two time slots containing two or four TRS symbols. In some aspects, if UE 120 detects that a TRS exists in one or more sub-bands and that a TRS does not exist in at least one sub-band, UE 120 can modify the LL computation and LL IIR filtering to utilize the current TRS symbols. For example, UE 120 can detect the pattern of the current TRS symbol in a TRS burst, adjust the Doppler LL metric calculation to use only the current TRS symbol based on the detected pattern, and adjust the LL IIR filtering (e.g., adjust the filter weights) to take into account a modified LL metric that does not include all TRS symbols. Alternatively, in some aspects, in the event of a lost or partially lost TRS, UE 120 can skip the LL calculation, gate the IIR filtering (e.g., freeze the state of the LL IIR filter), and report the previous Doppler estimate.

[0101] In some respects, UE 120 may update the Frequency Tracking Loop (FTL) and / or Time Tracking Loop (TTL) at least in part based on the TRS or SSB. UE 120 may calculate the FTL update at least in part based on the Channel Impulse Response (CIR) from the TRS or SSB. UE 120 may calculate the TTL update at least in part based on the signal energy estimate provided by the Power Delay Profile (PDP) block using the TRS or SSB. However, the loss of a TRS or SSB symbol (or the loss of a TRS subband) may impair FTL and / or TTL updates, leading to inaccurate frequency and / or time tracking. In some respects, UE 120 may protect FTL and / or TTL processing at least in part based on the detection of a lost or partially lost TRS or SSB.

[0102] In some aspects, UE 120 can perform SSB-based FTL updates. For a desired SSB opportunity, UE 120 can detect the presence of the SSB in the time domain. The SSB may be contained within a 20 MHz sub-band. Therefore, UE 120 can use time-domain detection to detect whether the SSB is fully present or missing (e.g., without detecting the presence of the SSB in each sub-band in the frequency domain). In some aspects, UE 120 can combine the detection of SSB loss to gate FTL updates associated with SSB timing. For example, UE 120 can gate the calculation of CIR autocorrelation and cross-correlation and IIR filtering to avoid contaminating the IIR filter state. In this case, UE 120 can also gate FTL outer-loop updates (e.g., Kalman filters) at least partially based on or independent of the FTL SNR metric.

[0103] In some aspects, UE 120 can perform TRS-based FTL updates. For an anticipated TRS burst (e.g., one or two time slots), UE 120 can perform time-domain and / or frequency-domain detection to detect missing TRS symbols and / or missing TRS sub-bands within the TRS burst. In some aspects, by combining the detection of missing TRS symbols and / or missing TRS sub-bands in the TRS burst set (e.g., detecting that the TRS burst is not fully present in the time and / or frequency domains), UE 120 can completely skip processing the TRS burst. In this case, UE 120 can gate the calculation of CIR autocorrelation and cross-correlation of the TRS burst and IIR filtering, and UE 120 can gate the update of the FTL outer loop (e.g., Kalman filter) associated with the TRS burst. In some aspects, by combining the detection of missing TRS symbols and / or missing TRS sub-bands in the TRS burst set, UE 120 can modify the FTL update processing to calculate the FTL update at least in part based on the existing TRS symbols and / or sub-bands. In some aspects, when configuring a two-slot TRS burst, UE 120 can perform dynamic backoff to a single-slot TRS by determining that the TRS symbol is fully present (e.g., in all sub-bands) in only one TRS slot of the two-slot TRS burst. In this case, UE 120 can use only the slot where the TRS symbol is fully present to calculate CIR and FTL correlations, and the UE can ignore the other TRS slot in the TRS burst (e.g., where the TRS symbol is not fully present). In some aspects, UE 120 can modify the calculation of CIR and FTL correlations to take into account partial TRS symbols. In this case, to prevent phase distortion caused by calculations using different frequency sub-bands on different TRS symbols, UE 120 can use only the frequency sub-bands present in both TRS symbols of the TRS slot in the CIR / FTL calculation.

[0104] In some aspects, UE 120 can perform SSB-based TTL updates. For a desired SSB burst, UE 120 can perform time-domain SSB detection to detect whether the SSB is fully present or missing for each SSB symbol. In some aspects, UE 120 can protect CIR combinations (e.g., at least partially based on coherent and incoherent filtering) by excluding blanked SSB symbols (e.g., SSB symbols that are not present in the SSB burst). In some aspects, UE 120 can gate the TTL update steps associated with the SSB burst by incorporating the detection that the entire SSB burst is blanked (e.g., all SSBs are absent in the SSB burst).

[0105] In some aspects, UE 120 can perform TTS-based TTL updates. For an anticipated TRS burst (e.g., one or two time slots), UE 120 can perform time-domain and / or frequency-domain detection to detect lost TRS symbols and / or lost TRS subbands within the TRS burst. In some aspects, by combining the detection of lost TRS symbols and / or lost TRS subbands in the TRS burst set (e.g., detecting that the TRS burst is not fully present in the time and / or frequency domains), UE 120 can exclude TRS symbols from the CIR combination where the TRS is wholly or partially lost (e.g., in one or more subbands). In some aspects, if the TRS is at least partially lost in all TRS symbols (e.g., in one or more subbands), or if the CIR combination metric of the burst set does not meet a threshold, UE 120 can gate the TTL update associated with the TRS burst. In some aspects, by combining the detection of frequency-domain holes (e.g., frequency-domain holes in one or more sub-bands) in a TRS burst for one or more TRS symbols, UE 120 can apply sub-band hole filling during CIR combining by forcing the detection to be zero for lost sub-bands (e.g., to avoid noise injection from those sub-bands) and using auxiliary information from other TRS symbols. In this case, if the CIR combining metric does not meet a threshold, UE 120 can gate the TTL update. In some aspects, by combining the detection of frequency-domain holes (e.g., frequency-domain holes in one or more sub-bands) in a TRS burst for one or more TRS symbols, UE 120 can modify the CIR combining to fall back to incoherent combining if some TRS symbols are affected by sub-band holes. This fallback to incoherent CIR combining can increase robustness to time-domain phase changes caused by frequency-domain holes.

[0106] As described above Figure 6 As described, UE 120 can detect the presence of a reference signal in the channel at a time instance of the desired reference signal. UE 120 can selectively gate the reference signal based at least in part on the detection of its presence in the channel. Therefore, when the reference signal is not transmitted in the time instance and / or has a hole in the frequency domain, UE 120 can prevent inaccurate processing, such as CSF processing and / or TRS processing for frequency and time tracking loops. This can potentially increase the quality, speed, and reliability of communication between UE 120 and base station 110.

[0107] As mentioned above, Figure 6 This is provided as an example. Other examples may be related to... Figure 6 The examples described are different.

[0108] Figure 7This is a diagram illustrating an example 700 associated with TRS-based FTL processing according to this disclosure. Figure 7 As shown, Example 700 includes a TRS burst, which comprises a first TRS slot and a second TRS slot. Each of the first and second TRS slots includes two TRS symbols. Figure 7 As shown, TRS can be fully present in all sub-bands (e.g., SB#1 to SB#5) of the two TRS symbols in the first TRS time slot, and TRS can have holes in the frequency domain of the TRS symbols in the second TRS time slot. For example, TRS may be lost in SB#3 and SB#4 of the first TRS symbol in the second TRS time slot, and TRS may be lost in SB#4 and SB#5 of the second TRS symbol in the second TRS time slot.

[0109] In some respects, by detecting that TRS bursts are not entirely present in the TRS burst set (e.g., detecting frequency-domain apertures in the TRS of a second TRS slot), UE 120 can completely skip processing of TRS bursts. In this case, UE 120 can gate the calculation of CIR autocorrelation and cross-correlation of the TRS burst and IIR filtering, and UE 120 can gate the update of the FTL outer loop (e.g., Kalman filter) associated with the TRS burst.

[0110] As shown by reference numeral 710 in the attached figure, in some aspects, by combining the detection of lost TRS subbands in the second TRS slot of the TRS burst with the determination that the TRS is entirely present in the TRS symbols of the first TRS slot of the TRS burst, the UE 120 can perform a dynamic backoff of one slot. In this case, the UE 120 can use only the first TRS slot to calculate the CIR and FTL correlations, where the TRS symbols are entirely present in the first TRS slot. In this case, when calculating the CIR and FTL correlations, the UE can ignore the second TRS slot in the TRS burst, where the TRS symbols are not entirely present in the second TRS slot.

[0111] As shown by reference numeral 720 in the attached figure, in some aspects, UE 120 can modify the calculation of CIR and FTL correlations to take into account partial TRS symbols that exist within a TRS burst (e.g., partial TRS symbols in the second TRS slot). In this case, for each TRS slot, UE 120 can use the frequencies of the TRS sub-bands that are commonly available in the two TRS symbols of the TRS slot to calculate the CIR and FTL correlations. For example, because the TRS exists in all sub-bands of the two TRS symbols in the first slot, UE 120 can use all frequency sub-bands to calculate the CIR and FTL correlations in the first TRS slot. In the second TRS slot, the TRS exists only in the two TRS symbols in SB#1 and SB#2. Therefore, UE 120 can use only the TRS in SB#1 and SB#2 to calculate the CIR and FTL correlations in the second TRS slot. In this scenario, UE 120 may ignore the TRS in SB#5 of the first TRS symbol in the second TRS time slot, and UE 120 may ignore the TRS in SB#3 of the second TRS symbol in the second TRS time slot. In some aspects, UE 120 may combine the correlations calculated in the first and second TRS time slots, weighted by the correlation reliability in each time slot. For example, the correlation reliability in a TRS time slot may be based at least in part on the number of common sub-bands in the two TRS symbols of the TRS time slot.

[0112] As mentioned above, Figure 7 This is provided as an example. Other examples may be related to... Figure 7 The examples described are different.

[0113] Figure 8 This is a diagram illustrating an example process 800 performed by a UE, for example, according to this disclosure. Example process 800 is an example of a UE (e.g., UE 120) performing gating operations associated with the detection and processing of a reference signal in an unlicensed spectrum.

[0114] like Figure 8 As shown, in some aspects, process 800 may include detecting the presence of a desired reference signal in the channel at a time instance (block 810). For example, the UE (e.g., using...) Figure 9 The described detection component 908 can detect the time instance of the desired reference signal, whether the reference signal exists in the channel, as described above.

[0115] like Figure 8 As further shown, in some aspects, process 800 may include selectively gating the reference signal based on the detection of its presence in the channel (block 820). For example, the UE (e.g., using...) Figure 9 The described gating component 910 can selectively gating the reference signal based on the detection of whether the reference signal is present in the channel, as described above.

[0116] Process 800 may include additional aspects, such as any single aspect or any combination of aspects of one or more other processes described below and / or in conjunction with one or more other processes described elsewhere herein.

[0117] In the first aspect, the reference signal is the channel state information reference signal.

[0118] In the second aspect, alone or in combination with the first aspect, the reference signal is a tracking reference signal.

[0119] In the third aspect, either alone or in combination with one or more of the first and second aspects, the channel is in an unlicensed spectrum.

[0120] In the fourth aspect, detecting the presence of a reference signal in a channel, either alone or in combination with one or more of the first to third aspects, includes: detecting the presence of a reference signal in a channel based at least in part on comparing signal measurements on at least one sub-band of the channel with a threshold.

[0121] In the fifth aspect, either alone or in combination with one or more of the first to fourth aspects, the signal measurement is the signal-to-noise ratio.

[0122] In the sixth aspect, either alone or in combination with one or more of the first to fourth aspects, the signal measurement is a received power measurement.

[0123] In the seventh aspect, detecting the presence of a reference signal in the channel, either alone or in combination with one or more of the first to sixth aspects, includes: detecting, at a time instance of the desired reference signal, whether the reference signal exists in the channel in the time domain.

[0124] In the eighth aspect, detecting the presence of a reference signal in a time-domain channel, either alone or in combination with one or more of the first to seventh aspects, includes: measuring a signal measurement value in the time-domain channel; and comparing the signal measurement value in the time-domain channel with a time-domain signal measurement threshold.

[0125] In the ninth aspect, selectively gating the processing of a reference signal, either alone or in combination with one or more of the first to eighth aspects, includes: gating the processing of the reference signal to be used entirely for the occurrence of a reference signal associated with a time instance of the desired reference signal, based at least in part on the detection that the reference signal does not exist in the channel in the time domain.

[0126] In the tenth aspect, detecting the presence of a reference signal in the channel, either alone or in combination with one or more of the first to ninth aspects, includes: detecting whether the reference signal exists in the frequency domain of each of the plurality of sub-bands in the channel.

[0127] In the eleventh aspect, detecting the presence of a reference signal in the frequency domain of each of a plurality of sub-bands in the channel, either alone or in combination with one or more of the first to tenth aspects, comprises: measuring a corresponding signal measurement value in the frequency domain of each of the plurality of sub-bands; and comparing the corresponding signal measurement value in the frequency domain of each of the plurality of sub-bands with a frequency domain signal measurement threshold.

[0128] In the twelfth aspect, alone or in combination with one or more of the first to eleventh aspects, the multiple sub-bands include multiple 20 MHz sub-bands.

[0129] In the thirteenth aspect, either alone or in combination with one or more of the first to twelfth aspects, the multiple sub-bands include sub-bands associated with the LBT process performed by the base station.

[0130] In the fourteenth aspect, selectively gating the processing of a reference signal, either alone or in combination with one or more of the first to thirteenth aspects, includes: gating the processing of the reference signal to be used entirely for the occurrence of a reference signal associated with a time instance of the desired reference signal, based at least in part on the detection that the reference signal does not exist in the frequency domain of at least one of a plurality of sub-bands.

[0131] In the fifteenth aspect, selectively gating the processing of a reference signal, either alone or in combination with one or more of the first to fourteenth aspects, comprises: processing the reference signal using a portion of the reference signal that is in one or more sub-bands, wherein the reference signal is in the frequency domain of one or more sub-bands, based at least in part on the detection that the reference signal is not present in the frequency domain of at least one of the plurality of sub-bands.

[0132] In the sixteenth aspect, detecting the presence of a reference signal in a channel, either alone or in combination with one or more of the first to fifteenth aspects, comprises: detecting, at a time instance of the desired reference signal, whether the reference signal exists in the channel in the time domain; and detecting, at least in part, whether the reference signal exists in the frequency domain of each of a plurality of sub-bands of the channel based on the determination that the reference signal exists in the channel in the time domain.

[0133] In the seventeenth aspect, selectively gating the processing of a reference signal, either alone or in combination with one or more of the first to sixteenth aspects, includes: gating the processing of the reference signal for the occurrence of a reference signal associated with a time instance of the desired reference signal, based at least in part on the detection that the reference signal is not present in the channel.

[0134] In the eighteenth aspect, alone or in combination with one or more of the first to seventeenth aspects, the processing of the gated reference signal includes: for a filter having filter values ​​at least partially based on the processing reference signal, preventing the current value of the filter from changing based on the occurrence of a reference signal associated with a time instance of the desired reference signal.

[0135] In the nineteenth aspect, alone or in combination with one or more of the first to eighteenth aspects, the reference signal is a periodic reference signal.

[0136] In the twentieth aspect, alone or in combination with one or more of the first to nineteenth aspects, it is desired that the time instance of the reference signal be based at least in part on the periodicity of the reference signal.

[0137] In the twenty-first aspect, alone or in combination with one or more of the first to twentieth aspects, the reference signal is a semi-persistent scheduling reference signal.

[0138] In the twenty-second aspect, either alone or in combination with one or more of the first to twenty-first aspects, it is desired that the timing instances of the reference signal be based at least in part on radio resource control messages received from the base station, wherein the radio resource control information configures the timing instances of multiple occurrences of the reference signal.

[0139] In the twenty-third aspect, either alone or in combination with one or more of the first to twenty-second aspects, process 800 includes receiving from the base station an indication of scheduling the time instance of the desired reference signal prior to the time instance of the desired reference signal.

[0140] although Figure 8 An example box of process 800 is shown, but in some respects, process 800 may include more than Figure 8 The blocks depicted may contain more boxes, fewer boxes, different boxes, or boxes arranged differently. Additionally or alternatively, two or more boxes in process 800 may be executed in parallel.

[0141] Figure 9 This is a block diagram of an example device 900 for wireless communication. Device 900 may be a UE, or a UE may include device 900. In some aspects, device 900 includes a receiving component 902 and a transmitting component 904, which can communicate with each other (e.g., via one or more buses and / or one or more other components). As shown, device 900 can use the receiving component 902 and the transmitting component 904 to communicate with another device 906 (such as a UE, a base station, or another wireless communication device). As further shown, device 900 may include one or more of a detection component 908 and / or a gating component 910, etc.

[0142] In some respects, device 900 can be configured to perform the functions described herein. Figure 6-7 One or more operations described herein. Additionally or alternatively, device 900 may be configured to perform one or more processes described herein (e.g., Figure 8 The process 800) or a combination thereof. In some respects, Figure 9 The device 900 and / or one or more components shown may include the above-described combination. Figure 2 One or more components of the UE described. Additionally or alternatively, Figure 9 One or more components shown can be combined as described above. Figure 2 Implemented within one or more of the described components. Additionally or alternatively, one or more of the components in the group may be implemented at least partially as software stored in memory. For example, a component (or a portion of a component) may be implemented as instructions or code stored in a non-transitory computer-readable medium and implementable by a controller or processor to perform the function or operation of the component.

[0143] Receiver 902 may receive communications from device 906, such as reference signals, control information, data communications, or combinations thereof. Receiver 902 may provide the received communications to one or more other components of device 900. In some aspects, receiver 902 may perform signal processing on the received communications (such as filtering, amplification, demodulation, analog-to-digital conversion, demultiplexing, deinterleaving, demapping, equalization, interference cancellation, or decoding, in other examples), and may provide the processed signal to one or more other components of device 906. In some aspects, receiver 902 may include the combinations described above. Figure 2 The described UE includes one or more antennas, demodulators, MIMO detectors, receiver processors, controllers / processors, memory, or combinations thereof.

[0144] Transmitting component 904 can transmit communications, such as reference signals, control information, data communications, or combinations thereof, to device 906. In some aspects, one or more other components of device 906 can generate communications and provide the generated communications to transmitting component 904 for transmission to device 906. In some aspects, transmitting component 904 can perform signal processing on the generated communications (such as filtering, amplification, modulation, digital-to-analog conversion, multiplexing, interleaving, mapping, or encoding, in other examples) and can transmit the processed signals to device 906. In some aspects, transmitting component 904 can include combinations thereof. Figure 2 The described UE includes one or more antennas, modulators, transmit MIMO processors, transmit processors, controllers / processors, memory, or combinations thereof. In some aspects, the transmit component 904 may be co-located with the receive component 902 in a transceiver.

[0145] The detection component 908 can detect whether the reference signal exists in the channel at a time instance of the desired reference signal. The gating component 910 can selectively gate the processing of the reference signal based on the detection of whether the reference signal exists in the channel.

[0146] The receiving component 902 can receive an indication from the base station of the time instance for scheduling the desired reference signal before the time instance of the desired reference signal.

[0147] Figure 9 The number and arrangement of components shown are provided as an example. In reality, with... Figure 9 Compared to the components shown, there may be more components, fewer components, different components, or different arrangements of components. Furthermore, Figure 9 The two or more components shown can be implemented within a single component, or Figure 9 The single component shown can be implemented as multiple distributed components. Additionally or alternatively, Figure 9 The set (one or more) components shown can perform one or more functions, which are described as being performed by... Figure 9 The other set of components shown will be executed.

[0148] The following provides an overview of some aspects of this disclosure:

[0149] Aspect 1: A method for wireless communication by a user equipment (UE) includes detecting a time instance of a desired reference signal, whether the reference signal exists in a channel; and selectively gating the reference signal based on the detection that the reference signal exists in the channel.

[0150] Aspect 2: According to the method described in aspect 1, the reference signal is a channel state information reference signal.

[0151] Aspect 3: The method according to any one of Aspects 1-2, wherein the reference signal is a tracking reference signal.

[0152] Aspect 4: The method according to any one of Aspects 1-3, wherein the channel is located in an unlicensed spectrum.

[0153] Aspect 5: The method according to any one of Aspects 1-4, wherein detecting the presence of a reference signal in the channel comprises: detecting the presence of a reference signal in the channel based at least in part on comparing signal measurements on at least one sub-band of the channel with a threshold.

[0154] Aspect 6: According to the method described in aspect 5, the signal measurement is the signal-to-noise ratio.

[0155] Aspect 7: According to the method described in aspect 5, the signal measurement value is the received power measurement value.

[0156] Aspect 8: The method according to any one of Aspects 1-7, wherein detecting whether a reference signal exists in the channel comprises: detecting whether the reference signal exists in the channel in the time domain at a time instance of the desired reference signal.

[0157] Aspect 9: According to the method of aspect 8, detecting whether a reference signal exists in the channel in the time domain includes: measuring a signal measurement value in the channel in the time domain; and comparing the signal measurement value in the channel in the time domain with a time domain signal measurement threshold.

[0158] Aspect 10: The method according to any one of Aspects 8-9, wherein selectively performing gating processing of the reference signal comprises: performing gating processing of the reference signal at least in part based on the detection that the reference signal does not exist in the time domain in the channel, so as to be used entirely for the occurrence of the reference signal associated with the time instance of the desired reference signal.

[0159] Aspect 11: The method according to any one of Aspects 1-10, wherein detecting the presence of a reference signal in the channel comprises: detecting whether the reference signal exists in the frequency domain of each of a plurality of sub-bands in the channel.

[0160] Aspect 12: According to the method of aspect 11, wherein detecting whether a reference signal exists in the frequency domain of each of the plurality of sub-bands in the channel comprises: measuring a corresponding signal measurement value in the frequency domain of each of the plurality of sub-bands; and comparing the corresponding signal measurement value in the frequency domain of each of the plurality of sub-bands with a frequency domain signal measurement threshold.

[0161] Aspect 13: The method according to any one of Aspects 11-12, wherein the plurality of sub-bands includes a plurality of 20 MHz sub-bands.

[0162] Aspect 14: The method according to any one of Aspects 11-13, wherein the plurality of sub-bands includes sub-bands associated with a Listen-Before-Speak (LBT) process performed by the base station.

[0163] Aspect 15: The method according to any one of Aspects 11-14, wherein selectively gating the reference signal comprises: gating the reference signal at least in part based on the detection that the reference signal does not exist in the frequency domain of at least one of the plurality of sub-bands to be used entirely for the occurrence of the reference signal associated with the time instance of the desired reference signal.

[0164] Aspect 16: The method according to any one of aspects 11 to 14, wherein selectively performing gating processing of the reference signal comprises: processing the reference signal using a portion of the reference signal in one or more sub-bands in which the reference signal exists, based at least in part on the detection that the reference signal does not exist in the frequency domain of at least one sub-band of a plurality of sub-bands.

[0165] Aspect 17: The method according to any one of Aspects 1 to 16, wherein detecting the presence of a reference signal in the channel comprises: detecting, at a time instance of the desired reference signal, whether the reference signal exists in the channel in the time domain; and detecting, at least in part, whether the reference signal exists in the frequency domain of each of a plurality of sub-bands of the channel based on the determination that the reference signal exists in the channel in the time domain.

[0166] Aspect 18: The method according to any one of Aspects 1-17, wherein selectively performing gating processing of the reference signal comprises: performing gating processing of the reference signal for the occurrence of a reference signal associated with a time instance of the desired reference signal based on the detection that the reference signal is not present in the channel.

[0167] Aspect 19: According to the method of aspect 18, wherein performing gating processing of the reference signal includes: for a filter having filter values ​​at least partially based on the processing of the reference signal, preventing the current value of the filter value from changing based on the occurrence of the reference signal associated with the time instance of the desired reference signal.

[0168] Aspect 20: The method according to any one of Aspects 1-19, wherein the reference signal is a periodic reference signal.

[0169] Aspect 21: According to the method of aspect 20, the time instance of the desired reference signal is at least partially based on the periodicity of the reference signal.

[0170] Aspect 22: The method according to any one of aspects 1-21, wherein the reference signal is a semi-persistent scheduling reference signal.

[0171] Aspect 23: According to the method of aspect 22, wherein the desired time instance of the reference signal is based at least in part on radio resource control messages received from the base station, the radio resource control information configuring the time instances of multiple occurrences of the reference signal.

[0172] Aspect 24: The method according to any one of aspects 1-23 further includes: receiving from the base station an indication of scheduling a time instance of the desired reference signal before the time instance of the desired reference signal.

[0173] Aspect 25: An apparatus for wireless communication at a device, comprising a processor, a memory coupled to the processor, and instructions stored in the memory and executable by the processor to cause the apparatus to perform one or more aspects of aspects 1-24.

[0174] Aspect 26: An apparatus for wireless communication, comprising a memory and one or more processors coupled to the memory, the memory and the one or more processors being configured to perform the methods of one or more aspects of aspects 1-24.

[0175] Aspect 27: An apparatus for wireless communication, comprising at least one component for performing the methods of one or more aspects of aspects 1-24.

[0176] Aspect 28: A non-transitory computer-readable medium storing code for wireless communication, the code including instructions executable by a processor to perform methods of one or more aspects of aspects 1-24.

[0177] Aspect 29: A non-transitory computer-readable medium storing a set of instructions for wireless communication, the set of instructions including one or more instructions which, when executed by one or more processors of a device, cause the device to perform one or more of the methods of aspects 1-24.

[0178] The foregoing disclosure provides illustrations and descriptions but is not intended to be exhaustive or to limit the aspects to the precise form disclosed. Modifications and alterations may be made based on the foregoing disclosure, or from practice in various aspects.

[0179] As used herein, the term "component" is intended to be understood broadly as hardware and / or a combination of hardware and software. Whether referred to as software, firmware, middleware, microcode, hardware description language, or other forms, software should be interpreted broadly in other examples to mean instructions, instruction sets, code, code segments, program code, programs, subroutines, software modules, applications, software applications, software packages, routines, subroutines, objects, executable files, execution threads, procedures, and / or functions. As used herein, a "processor" is implemented in hardware and / or a combination of hardware and software. It is clear that the systems and / or methods described herein can be implemented in various forms of hardware and / or combinations of hardware and software. The actual dedicated control hardware or software code used to implement these systems and / or methods does not limit these aspects. Therefore, this document does not refer to specific software code to describe the operation and behavior of systems and / or methods, as those skilled in the art will understand that software and hardware can be designed to implement systems and / or methods, at least in part, based on the descriptions herein.

[0180] As used in this article, “meeting the threshold” can refer to a value greater than the threshold, greater than or equal to the threshold, less than the threshold, less than or equal to the threshold, equal to the threshold, or not equal to the threshold, depending on the context.

[0181] Even if a particular combination of features is recited in the claims and / or disclosed in the specification, such combinations are not intended to limit the disclosure of the aspects. Many of these features can be combined in ways not specifically listed in the claims and / or not disclosed in the specification. The disclosure of aspects includes each dependent claim in combination with each other claim in the claim set. As used herein, the phrase “at least one” in the list of items refers to any combination of those items, including single members. As an example, “at least one of the following: a, b, or c” is intended to cover: a, b, c, a+b, a+c, b+c, and a+b+c, and any combination with multiples of the same element (e.g., a+a, a+a+a, a+a+b, a+a+c, a+b+b, a+c+c, b+b, b+b+b, b+b+c, c+c, and c+c+c, or any other ordering of a, b, and c).

[0182] Unless explicitly stated otherwise, no element, action, or instruction used herein should be construed as essential or necessary. Furthermore, as used herein, the articles “a” and “an” are intended to include one or more items and are interchangeable with “one or more.” Furthermore, as used herein, the article “the” is intended to include one or more items referenced by the article “the” and is interchangeable with “one or more.” Furthermore, as used herein, the terms “set” and “group” are intended to include one or more items and are interchangeable with “one or more.” If only one item is intended to be used, the phrase “only one” or similar language is used. Furthermore, as used herein, the terms “has,” “have,” or “having” are intended as open-ended terms for elements that do not restrict their modification (e.g., an element having A also having B). Furthermore, the phrase “based on” is intended to mean “at least partially based on” unless explicitly stated otherwise. Furthermore, as used herein, the term “or” is intended to be included when used in series and may be used interchangeably with “and / or” unless otherwise expressly stated (e.g., if with “either” or “only one”).

Claims

1. A user equipment (UE) for wireless communication, comprising: At least one memory containing instructions; as well as At least one processor is configured to execute the instructions such that the UE: Detect the presence of a reference signal in the channel at a time instance of the desired reference signal; as well as The reference signal is selectively gating based on whether it exists in the channel, wherein when the reference signal is not detected in the channel, the selective gating of the reference signal includes gating based on a report of an estimate of the channel based on the reference signal.

2. The UE according to claim 1, wherein, The reference signal is a channel state information reference signal or a tracking reference signal, and the channel is in an unlicensed spectrum.

3. The UE according to claim 1, wherein, When the presence of the reference signal in the channel is detected, the at least one processor is configured to cause the UE to: The presence of the reference signal in the channel is detected at least in part by comparing signal measurements on at least one sub-band of the channel with a threshold.

4. The UE according to claim 3, wherein, The signal measurement is at least one of the signal-to-noise ratio or the received power measurement.

5. The UE according to claim 1, wherein, When the presence of the reference signal in the channel is detected, the at least one processor is configured to cause the UE to: Detect the presence of the reference signal in the channel in the time domain at the expected time instance.

6. The UE according to claim 5, wherein, When the presence of the reference signal in the channel in the time domain is detected, the at least one processor is configured to cause the UE to: Measure the signal measurement value on the channel in the time domain; as well as The signal measurement value on the channel in the time domain is compared with the time domain signal measurement threshold.

7. The UE according to claim 5, wherein, When selectively performing gating processing of the reference signal, the at least one processor is configured such that the UE: The reference signal is gated at least in part based on the detection that the reference signal does not exist in the channel in the time domain, so as to be used entirely for the occurrence of the reference signal associated with the time instance of the desired reference signal.

8. The UE according to claim 1, wherein, When the presence of the reference signal in the channel is detected, the at least one processor is configured to cause the UE to: The presence of the reference signal is detected in the frequency domain of each of the multiple sub-bands in the channel.

9. The UE according to claim 8, wherein, When detecting whether the reference signal exists in the frequency domain of each of the plurality of sub-bands in the channel, the at least one processor is configured to cause the UE to: Measure the corresponding signal measurement value in the frequency domain in each of the plurality of sub-frequency bands; as well as The corresponding signal measurement value in the frequency domain of each of the plurality of sub-frequency bands is compared with the frequency domain signal measurement threshold.

10. The UE according to claim 8, wherein, The multiple sub-bands include multiple 20 MHz sub-bands.

11. The UE according to claim 8, wherein, The multiple sub-bands include sub-bands associated with the Listen-Before-Speak (LBT) process performed by the base station.

12. The UE according to claim 8, wherein, When selectively performing gating processing of the reference signal, the at least one processor is configured such that the UE: The reference signal is gated at least in part based on the detection that the reference signal does not exist in the frequency domain of at least one of the plurality of sub-bands, so as to be used entirely for the occurrence of the reference signal associated with the time instance of the desired reference signal.

13. The UE according to claim 8, wherein, When selectively performing gating processing of the reference signal, the at least one processor is configured such that the UE: The reference signal is processed using a portion of the reference signal that is in one or more sub-bands, based at least in part on the detection that the reference signal does not exist in the frequency domain of at least one of the plurality of sub-bands.

14. The UE according to claim 1, wherein, When the presence of the reference signal in the channel is detected, the at least one processor is configured to cause the UE to: Detect whether the reference signal exists in the channel in the time domain at the time instance in which the reference signal is expected; as well as The presence of the reference signal in the frequency domain of each of the plurality of sub-bands of the channel is detected, at least in part based on the determination that the reference signal exists in the channel in the time domain.

15. The UE according to claim 1, wherein, When selectively performing gating processing of the reference signal, the at least one processor is configured such that the UE: Based on the detection that the reference signal is not present in the channel, gating processing of the reference signal is performed for the occurrence of the reference signal associated with the time instance of the desired reference signal.

16. The UE according to claim 15, wherein, During the gating processing of the reference signal, the at least one processor is configured such that the UE: For a filter having a filter value that is at least partially based on the filter value of the processed reference signal, the current value of the filter is prevented from changing based on the occurrence of the reference signal that is processed in relation to a time instance of the desired reference signal.

17. The UE according to claim 1, wherein, The reference signal is a periodic reference signal, and it is expected that the time instances of the reference signal are at least partially based on the periodicity of the reference signal.

18. The UE according to claim 1, wherein, The reference signal is a semi-persistent scheduling reference signal, and wherein the time instances of the reference signal are expected to be based at least in part on radio resource control messages received from a base station, the radio resource control messages configuring the time instances of multiple occurrences of the reference signal.

19. The UE according to claim 1, wherein the one or more processors are further configured to: Before the desired time instance of the reference signal is received, an instruction is received from the base station to schedule the desired time instance of the reference signal.

20. A method for wireless communication by a user equipment (UE), comprising: Detect the presence of a reference signal in the channel at a time instance of the desired reference signal; as well as The reference signal is selectively gating based on whether it exists in the channel, wherein when the reference signal is not detected in the channel, the selective gating of the reference signal includes gating based on a report of an estimate of the channel based on the reference signal.

21. The method according to claim 20, wherein, Detecting whether the reference signal exists in the channel includes: The presence of the reference signal in the channel is detected at least in part by comparing signal measurements on at least one sub-band of the channel with a threshold, wherein the signal measurements are at least one of signal-to-noise ratio or received power measurements.

22. The method according to claim 20, wherein, Detecting whether the reference signal exists in the channel includes: Detect the presence of the reference signal in the channel in the time domain at the expected time instance.

23. The method according to claim 22, wherein, Selectively performing gating processing on the reference signal includes: The reference signal is gated at least in part based on the detection that the reference signal does not exist in the channel in the time domain, so as to be used entirely for the occurrence of the reference signal associated with the time instance of the desired reference signal.

24. The method of claim 20, wherein, Detecting whether the reference signal exists in the channel includes: The presence of the reference signal is detected in the frequency domain of each of the multiple sub-bands in the channel.

25. The method according to claim 24, wherein, Selectively performing gating processing on the reference signal includes: The reference signal is gated at least in part based on the detection that the reference signal does not exist in the frequency domain of at least one of the plurality of sub-bands, so as to be used entirely for the occurrence of the reference signal associated with the time instance of the desired reference signal.

26. The method according to claim 24, wherein, Selectively performing gating processing on the reference signal includes: The reference signal is processed using the portion of the reference signal that is in one or more sub-bands in which the reference signal is present, based at least in part on the detection that the reference signal does not exist in the frequency domain of at least one of the plurality of sub-bands.

27. The method of claim 20, wherein, Detecting whether the reference signal exists in the channel includes: Detecting whether the reference signal exists in the channel in the time domain at a time instance in which the reference signal is expected; and The presence of the reference signal in the frequency domain of each of the plurality of sub-bands of the channel is detected, at least in part based on the determination that the reference signal exists in the channel in the time domain.

28. The method according to claim 20, wherein, Selectively gating the reference signal includes: based on detecting that the reference signal is not present in the channel, gating the reference signal for the occurrence of the reference signal associated with a time instance of the desired reference signal, wherein gating the reference signal includes: For a filter having a filter value that is at least partially based on the filter value of the processed reference signal, the current value of the filter is prevented from changing based on the occurrence of the reference signal that is processed in relation to a time instance of the desired reference signal.

29. A non-transitory computer-readable medium storing a set of instructions for wireless communication, the set of instructions comprising: One or more instructions, when executed by one or more processors of the user equipment (UE), cause the UE to: Detect the presence of a reference signal in the channel at a time instance of the desired reference signal; as well as The reference signal is selectively gating based on whether it exists in the channel, wherein when the reference signal is not detected in the channel, the selective gating of the reference signal includes gating based on a report of an estimate of the channel based on the reference signal.

30. An apparatus for wireless communication, comprising: A component for detecting the presence of a desired reference signal in the channel at a given time instance; as well as The component is used to selectively perform gating processing of the reference signal based on whether the reference signal is present in the channel, wherein when the reference signal is not detected in the channel, selectively performing gating processing of the reference signal includes gating based on a report of an estimate of the channel based on the reference signal.

31. A computer program product comprising computer-readable instructions, which, when executed by a processor, cause the processor to perform the method according to any one of claims 20-28.

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