WO2020036350A1 - Procédé de transmission ou de réception de signal de liaison descendante entre un terminal et une station de base dans un système de communication sans fil, et appareil le prenant en charge - Google Patents

Procédé de transmission ou de réception de signal de liaison descendante entre un terminal et une station de base dans un système de communication sans fil, et appareil le prenant en charge Download PDF

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Publication number
WO2020036350A1
WO2020036350A1 PCT/KR2019/009611 KR2019009611W WO2020036350A1 WO 2020036350 A1 WO2020036350 A1 WO 2020036350A1 KR 2019009611 W KR2019009611 W KR 2019009611W WO 2020036350 A1 WO2020036350 A1 WO 2020036350A1
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terminal
pdsch
dmrs
dci
information
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PCT/KR2019/009611
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English (en)
Korean (ko)
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이길봄
김규석
강지원
김기준
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엘지전자 주식회사
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Publication of WO2020036350A1 publication Critical patent/WO2020036350A1/fr

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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L1/00—Arrangements for detecting or preventing errors in the information received
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L5/00—Arrangements affording multiple use of the transmission path
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W72/00—Local resource management
    • H04W72/12—Wireless traffic scheduling

Definitions

  • the following description relates to a wireless communication system, and relates to a method for transmitting and receiving a downlink signal between a terminal and a base station in a wireless communication system and an apparatus supporting the same.
  • Wireless access systems are widely deployed to provide various kinds of communication services such as voice and data.
  • a wireless access system is a multiple access system capable of supporting communication with multiple users by sharing available system resources (bandwidth, transmission power, etc.).
  • multiple access systems include code division multiple access (CDMA) systems, frequency division multiple access (FDMA) systems, time division multiple access (TDMA) systems, orthogonal frequency division multiple access (OFDMA) systems, and single carrier frequency (SC-FDMA). division multiple access) system.
  • CDMA code division multiple access
  • FDMA frequency division multiple access
  • TDMA time division multiple access
  • OFDMA orthogonal frequency division multiple access
  • SC-FDMA single carrier frequency division multiple access
  • PT-RS phase tracking reference signal
  • the present invention may be related to the following technical configurations.
  • Machine learning refers to the field of researching methodologies to define and solve various problems in the field of artificial intelligence. do.
  • Machine learning is defined as an algorithm that improves the performance of a task through a consistent experience with a task.
  • ANN Artificial Neural Network
  • the artificial neural network may be defined by a connection pattern between neurons of different layers, a learning process of updating model parameters, and an activation function generating an output value.
  • the artificial neural network may include an input layer, an output layer, and optionally one or more hidden layers. Each layer contains one or more neurons, and the artificial neural network may include synapses that connect neurons to neurons. In an artificial neural network, each neuron may output a function value of an active function for input signals, weights, and deflections input through a synapse.
  • the model parameter refers to a parameter determined through learning and includes weights of synaptic connections and deflection of neurons.
  • the hyperparameter means a parameter to be set before learning in the machine learning algorithm, and includes a learning rate, the number of iterations, the mini batch size, and an initialization function.
  • the purpose of learning artificial neural networks can be seen as determining model parameters that minimize the loss function.
  • the loss function can be used as an index for determining an optimal model parameter in the learning process of an artificial neural network.
  • Machine learning can be categorized into supervised learning, unsupervised learning, and reinforcement learning.
  • Supervised learning refers to a method of learning artificial neural networks with a given label for training data, and a label indicates a correct answer (or result value) that the artificial neural network must infer when the training data is input to the artificial neural network.
  • Unsupervised learning may refer to a method of training artificial neural networks in a state where a label for training data is not given.
  • Reinforcement learning can mean a learning method that allows an agent defined in an environment to learn to choose an action or sequence of actions that maximizes cumulative reward in each state.
  • Machine learning which is implemented as a deep neural network (DNN) including a plurality of hidden layers among artificial neural networks, is called deep learning (Deep Learning), which is part of machine learning.
  • DNN deep neural network
  • Deep Learning Deep Learning
  • machine learning is used to mean deep learning.
  • a robot can mean a machine that automatically handles or operates a given task by its own ability.
  • a robot having a function of recognizing the environment, judging itself, and performing an operation may be referred to as an intelligent robot.
  • Robots can be classified into industrial, medical, household, military, etc. according to the purpose or field of use.
  • the robot may include a driving unit including an actuator or a motor to perform various physical operations such as moving a robot joint.
  • the movable robot includes a wheel, a brake, a propeller, and the like in the driving unit, and can travel on the ground or fly in the air through the driving unit.
  • Autonomous driving means a technology that drives by itself, and an autonomous vehicle means a vehicle that runs without a user's manipulation or with minimal manipulation of a user.
  • the technology of maintaining a driving lane the technology of automatically adjusting speed such as adaptive cruise control, the technology of automatically driving along a predetermined route, the technology of automatically setting a route when a destination is set, etc. All of these may be included.
  • the vehicle includes a vehicle having only an internal combustion engine, a hybrid vehicle having both an internal combustion engine and an electric motor together, and an electric vehicle having only an electric motor, and may include not only automobiles but also trains and motorcycles.
  • the autonomous vehicle may be viewed as a robot having an autonomous driving function.
  • Extended reality collectively refers to virtual reality (VR), augmented reality (AR), and mixed reality (MR).
  • VR technology provides real world objects and backgrounds only in CG images
  • AR technology provides virtual CG images on real objects images
  • MR technology mixes and combines virtual objects in the real world.
  • Graphic technology
  • MR technology is similar to AR technology in that it shows both real and virtual objects.
  • virtual objects are used as complementary objects to real objects, whereas in MR technology, virtual objects and real objects are used in an equivalent nature.
  • HMD Head-Mount Display
  • HUD Head-Up Display
  • mobile phone tablet PC, laptop, desktop, TV, digital signage, etc. It can be called.
  • FIG 1 illustrates an AI device 100 according to an embodiment of the present invention.
  • the AI device 100 is a TV, a projector, a mobile phone, a smartphone, a desktop computer, a notebook, a digital broadcasting terminal, a personal digital assistant (PDA), a portable multimedia player (PMP), a navigation device, a tablet PC, a wearable device, and a set-top box (STB). ), A DMB receiver, a radio, a washing machine, a refrigerator, a desktop computer, a digital signage, a robot, a vehicle, and the like, or a fixed device or a mobile device.
  • PDA personal digital assistant
  • PMP portable multimedia player
  • STB set-top box
  • the terminal 100 includes a communication unit 110, an input unit 120, a running processor 130, a sensing unit 140, an output unit 150, a memory 170, a processor 180, and the like. It may include.
  • the communicator 110 may transmit / receive data to / from external devices such as the other AI devices 100a to 100e or the AI server 200 using wired or wireless communication technology.
  • the communicator 110 may transmit / receive sensor information, a user input, a learning model, a control signal, and the like with external devices.
  • the communication technology used by the communication unit 110 may include Global System for Mobile Communication (GSM), Code Division Multi Access (CDMA), Long Term Evolution (LTE), 5G, Wireless LAN (WLAN), and Wireless-Fidelity (Wi-Fi). ), Bluetooth (Bluetooth®), Radio Frequency Identification (RFID), Infrared Data Association (IrDA), ZigBee, Near Field Communication (NFC), and the like.
  • GSM Global System for Mobile Communication
  • CDMA Code Division Multi Access
  • LTE Long Term Evolution
  • 5G Fifth Generation
  • Wi-Fi Wireless-Fidelity
  • Bluetooth Bluetooth
  • RFID Radio Frequency Identification
  • IrDA Infrared Data Association
  • ZigBee ZigBee
  • NFC Near Field Communication
  • the input unit 120 may acquire various types of data.
  • the input unit 120 may include a camera for inputting an image signal, a microphone for receiving an audio signal, a user input unit for receiving information from a user, and the like.
  • a signal obtained from the camera or microphone may be referred to as sensing data or sensor information by treating the camera or microphone as a sensor.
  • the input unit 120 may acquire input data to be used when acquiring an output using training data and a training model for model training.
  • the input unit 120 may obtain raw input data, and in this case, the processor 180 or the running processor 130 may extract input feature points as preprocessing on the input data.
  • the learning processor 130 may train a model composed of artificial neural networks using the training data.
  • the learned artificial neural network may be referred to as a learning model.
  • the learning model may be used to infer result values for new input data other than the training data, and the inferred values may be used as a basis for judgment to perform an operation.
  • the running processor 130 may perform AI processing together with the running processor 240 of the AI server 200.
  • the running processor 130 may include a memory integrated with or implemented in the AI device 100.
  • the running processor 130 may be implemented using the memory 170, an external memory directly coupled to the AI device 100, or a memory held in the external device.
  • the sensing unit 140 may acquire at least one of internal information of the AI device 100, surrounding environment information of the AI device 100, and user information using various sensors.
  • the sensors included in the sensing unit 140 include a proximity sensor, an illumination sensor, an acceleration sensor, a magnetic sensor, a gyro sensor, an inertial sensor, an RGB sensor, an IR sensor, a fingerprint sensor, an ultrasonic sensor, an optical sensor, a microphone, and a li. , Radar and so on.
  • the output unit 150 may generate an output related to visual, auditory, or tactile.
  • the output unit 150 may include a display unit for outputting visual information, a speaker for outputting auditory information, and a haptic module for outputting tactile information.
  • the memory 170 may store data supporting various functions of the AI device 100.
  • the memory 170 may store input data, training data, training model, training history, and the like acquired by the input unit 120.
  • the processor 180 may determine at least one executable operation of the AI device 100 based on the information determined or generated using the data analysis algorithm or the machine learning algorithm. In addition, the processor 180 may control the components of the AI device 100 to perform a determined operation.
  • the processor 180 may request, search for, receive, or utilize data of the running processor 130 or the memory 170, and may perform an operation predicted or determined to be preferable among the at least one executable operation.
  • the components of the AI device 100 may be controlled to execute.
  • the processor 180 may generate a control signal for controlling the corresponding external device and transmit the generated control signal to the corresponding external device.
  • the processor 180 may obtain intention information about the user input, and determine the user's requirements based on the obtained intention information.
  • the processor 180 uses at least one of a speech to text (STT) engine for converting a voice input into a string or a natural language processing (NLP) engine for obtaining intention information of a natural language. Intent information corresponding to the input can be obtained.
  • STT speech to text
  • NLP natural language processing
  • At least one or more of the STT engine or the NLP engine may be configured as an artificial neural network, at least partly learned according to a machine learning algorithm. At least one of the STT engine or the NLP engine may be learned by the running processor 130, may be learned by the running processor 240 of the AI server 200, or may be learned by distributed processing thereof. It may be.
  • the processor 180 collects history information including operation contents of the AI device 100 or feedback of a user about the operation, and stores the information in the memory 170 or the running processor 130, or the AI server 200. Can transmit to external device. The collected historical information can be used to update the learning model.
  • the processor 180 may control at least some of the components of the AI device 100 to drive an application program stored in the memory 170. In addition, the processor 180 may operate by combining two or more of the components included in the AI device 100 to drive the application program.
  • FIG 2 illustrates an AI server 200 according to an embodiment of the present invention.
  • the AI server 200 may refer to an apparatus for learning an artificial neural network using a machine learning algorithm or using an learned artificial neural network.
  • the AI server 200 may be composed of a plurality of servers to perform distributed processing, or may be defined as a 5G network.
  • the AI server 200 may be included as a part of the AI device 100 to perform at least some of the AI processing together.
  • the AI server 200 may include a communication unit 210, a memory 230, a running processor 240, a processor 260, and the like.
  • the communication unit 210 may transmit / receive data with an external device such as the AI device 100.
  • the memory 230 may include a model storage unit 231.
  • the model storage unit 231 may store a trained model or a trained model (or artificial neural network 231a) through the running processor 240.
  • the learning processor 240 may train the artificial neural network 231a using the training data.
  • the learning model may be used while mounted in the AI server 200 of the artificial neural network, or may be mounted and used in an external device such as the AI device 100.
  • the learning model can be implemented in hardware, software or a combination of hardware and software. When some or all of the learning model is implemented in software, one or more instructions constituting the learning model may be stored in the memory 230.
  • the processor 260 may infer a result value with respect to the new input data using the learning model, and generate a response or control command based on the inferred result value.
  • FIG 3 shows an AI system 1 according to an embodiment of the present invention.
  • the AI system 1 may include at least one of an AI server 200, a robot 100a, an autonomous vehicle 100b, an XR device 100c, a smartphone 100d, or a home appliance 100e.
  • This cloud network 10 is connected.
  • the robot 100a to which the AI technology is applied, the autonomous vehicle 100b, the XR device 100c, the smartphone 100d or the home appliance 100e may be referred to as the AI devices 100a to 100e.
  • the cloud network 10 may refer to a network that forms part of the cloud computing infrastructure or exists in the cloud computing infrastructure.
  • the cloud network 10 may be configured using a 3G network, 4G or Long Term Evolution (LTE) network or a 5G network.
  • LTE Long Term Evolution
  • the devices 100a to 100e and 200 constituting the AI system 1 may be connected to each other through the cloud network 10.
  • the devices 100a to 100e and 200 may communicate with each other through the base station, but may communicate with each other directly without passing through the base station.
  • the AI server 200 may include a server that performs AI processing and a server that performs operations on big data.
  • the AI server 200 includes at least one or more of the AI devices constituting the AI system 1, such as a robot 100a, an autonomous vehicle 100b, an XR device 100c, a smartphone 100d, or a home appliance 100e. Connected via the cloud network 10, the AI processing of the connected AI devices 100a to 100e may help at least a part.
  • the AI devices constituting the AI system 1 such as a robot 100a, an autonomous vehicle 100b, an XR device 100c, a smartphone 100d, or a home appliance 100e.
  • the AI processing of the connected AI devices 100a to 100e may help at least a part.
  • the AI server 200 may train the artificial neural network according to the machine learning algorithm in place of the AI devices 100a to 100e and directly store the learning model or transmit the training model to the AI devices 100a to 100e.
  • the AI server 200 receives input data from the AI devices 100a to 100e, infers a result value with respect to the received input data using a learning model, and generates a response or control command based on the inferred result value. Can be generated and transmitted to the AI device (100a to 100e).
  • the AI devices 100a to 100e may infer a result value from input data using a direct learning model and generate a response or control command based on the inferred result value.
  • the AI devices 100a to 100e to which the above-described technology is applied will be described.
  • the AI devices 100a to 100e illustrated in FIG. 3 may be viewed as specific embodiments of the AI device 100 illustrated in FIG. 1.
  • the robot 100a may be applied to an AI technology, and may be implemented as a guide robot, a transport robot, a cleaning robot, a wearable robot, an entertainment robot, a pet robot, an unmanned flying robot, or the like.
  • the robot 100a may include a robot control module for controlling an operation, and the robot control module may refer to a software module or a chip implemented in hardware.
  • the robot 100a acquires state information of the robot 100a by using sensor information obtained from various types of sensors, detects (recognizes) the surrounding environment and an object, generates map data, or moves a route and travels. You can decide on a plan, determine a response to a user interaction, or determine an action.
  • the robot 100a may use sensor information acquired from at least one sensor among a rider, a radar, and a camera to determine a movement route and a travel plan.
  • the robot 100a may perform the above operations by using a learning model composed of at least one artificial neural network.
  • the robot 100a may recognize the surrounding environment and the object using the learning model, and determine the operation using the recognized surrounding environment information or the object information.
  • the learning model may be directly learned by the robot 100a or may be learned by an external device such as the AI server 200.
  • the robot 100a may perform an operation by generating a result using a direct learning model, but transmits sensor information to an external device such as the AI server 200 and receives the result generated accordingly to perform an operation. You may.
  • the robot 100a determines a movement route and a travel plan using at least one of map data, object information detected from sensor information, or object information obtained from an external device, and controls the driving unit to determine the movement path and the travel plan. Accordingly, the robot 100a may be driven.
  • the map data may include object identification information for various objects arranged in a space in which the robot 100a moves.
  • the map data may include object identification information about fixed objects such as walls and doors and movable objects such as flower pots and desks.
  • the object identification information may include a name, type, distance, location, and the like.
  • the robot 100a may control the driving unit based on the control / interaction of the user, thereby performing an operation or driving.
  • the robot 100a may acquire the intention information of the interaction according to the user's motion or voice utterance and determine the response based on the acquired intention information to perform the operation.
  • the autonomous vehicle 100b may be implemented by an AI technology and implemented as a mobile robot, a vehicle, an unmanned aerial vehicle, or the like.
  • the autonomous vehicle 100b may include an autonomous driving control module for controlling the autonomous driving function, and the autonomous driving control module may refer to a software module or a chip implemented in hardware. Although the autonomous driving control module may be included inside as a configuration of the autonomous driving vehicle 100b, the autonomous driving control module may be configured and connected to the outside of the autonomous driving vehicle 100b.
  • the autonomous vehicle 100b acquires state information of the autonomous vehicle 100b by using sensor information obtained from various types of sensors, detects (recognizes) the surrounding environment and an object, generates map data, A travel route and a travel plan can be determined, or an action can be determined.
  • the autonomous vehicle 100b may use sensor information acquired from at least one sensor among a lidar, a radar, and a camera, similarly to the robot 100a, to determine a movement route and a travel plan.
  • the autonomous vehicle 100b may receive or recognize sensor information from external devices or receive information directly recognized from external devices. .
  • the autonomous vehicle 100b may perform the above operations by using a learning model composed of at least one artificial neural network.
  • the autonomous vehicle 100b may recognize a surrounding environment and an object using a learning model, and determine a driving line using the recognized surrounding environment information or object information.
  • the learning model may be learned directly from the autonomous vehicle 100b or may be learned from an external device such as the AI server 200.
  • the autonomous vehicle 100b may perform an operation by generating a result using a direct learning model, but transmits sensor information to an external device such as the AI server 200 and receives the result generated accordingly. You can also do
  • the autonomous vehicle 100b determines a moving route and a driving plan by using at least one of map data, object information detected from sensor information, or object information obtained from an external device, and controls the driving unit to determine the moving route and the driving plan. According to the plan, the autonomous vehicle 100b can be driven.
  • the map data may include object identification information for various objects arranged in a space (eg, a road) on which the autonomous vehicle 100b travels.
  • the map data may include object identification information about fixed objects such as street lights, rocks, buildings, and movable objects such as vehicles and pedestrians.
  • the object identification information may include a name, type, distance, location, and the like.
  • the autonomous vehicle 100b may perform an operation or drive by controlling the driving unit based on the user's control / interaction.
  • the autonomous vehicle 100b may acquire the intention information of the interaction according to the user's motion or voice utterance, and determine the response based on the obtained intention information to perform the operation.
  • AI technology is applied to the XR device 100c, and a head-mount display (HMD), a head-up display (HUD) provided in a vehicle, a television, a mobile phone, a smartphone, a computer, a wearable device, a home appliance, and a digital signage It may be implemented as a vehicle, a fixed robot or a mobile robot.
  • HMD head-mount display
  • HUD head-up display
  • the XR apparatus 100c analyzes three-dimensional point cloud data or image data acquired through various sensors or from an external device to generate location data and attribute data for three-dimensional points, thereby providing information on the surrounding space or reality object. It can obtain and render XR object to output. For example, the XR apparatus 100c may output an XR object including additional information about the recognized object in correspondence with the recognized object.
  • the XR apparatus 100c may perform the above-described operations using a learning model composed of at least one artificial neural network.
  • the XR apparatus 100c may recognize a reality object in 3D point cloud data or image data using a learning model, and may provide information corresponding to the recognized reality object.
  • the learning model may be learned directly from the XR device 100c or learned from an external device such as the AI server 200.
  • the XR apparatus 100c may perform an operation by generating a result using a direct learning model, but transmits sensor information to an external device such as the AI server 200 and receives the result generated accordingly. It can also be done.
  • the robot 100a may be implemented using an AI technology and an autonomous driving technology, such as a guide robot, a transport robot, a cleaning robot, a wearable robot, an entertainment robot, a pet robot, an unmanned flying robot, or the like.
  • an autonomous driving technology such as a guide robot, a transport robot, a cleaning robot, a wearable robot, an entertainment robot, a pet robot, an unmanned flying robot, or the like.
  • the robot 100a to which the AI technology and the autonomous driving technology are applied may mean a robot itself having an autonomous driving function, a robot 100a interacting with the autonomous vehicle 100b, and the like.
  • the robot 100a having an autonomous driving function may collectively move devices according to a given copper line or determine a copper line by itself without controlling the user.
  • the robot 100a and the autonomous vehicle 100b having the autonomous driving function may use a common sensing method to determine one or more of a movement route or a driving plan.
  • the robot 100a and the autonomous vehicle 100b having the autonomous driving function may determine one or more of the movement route or the driving plan by using information sensed through the lidar, the radar, and the camera.
  • the robot 100a which interacts with the autonomous vehicle 100b, is present separately from the autonomous vehicle 100b and is linked to the autonomous driving function inside or outside the autonomous vehicle 100b, or the autonomous vehicle 100b. ) May perform an operation associated with the user who boarded.
  • the robot 100a interacting with the autonomous vehicle 100b acquires sensor information on behalf of the autonomous vehicle 100b and provides the sensor information to the autonomous vehicle 100b or obtains sensor information, By generating object information and providing the object information to the autonomous vehicle 100b, the autonomous vehicle function of the autonomous vehicle 100b can be controlled or assisted.
  • the robot 100a interacting with the autonomous vehicle 100b may monitor a user in the autonomous vehicle 100b or control a function of the autonomous vehicle 100b through interaction with the user. .
  • the robot 100a may activate the autonomous driving function of the autonomous vehicle 100b or assist the control of the driver of the autonomous vehicle 100b.
  • the function of the autonomous vehicle 100b controlled by the robot 100a may include not only an autonomous vehicle function but also a function provided by a navigation system or an audio system provided in the autonomous vehicle 100b.
  • the robot 100a interacting with the autonomous vehicle 100b may provide information or assist a function to the autonomous vehicle 100b outside the autonomous vehicle 100b.
  • the robot 100a may provide traffic information including signal information to the autonomous vehicle 100b, such as a smart signal light, or may interact with the autonomous vehicle 100b, such as an automatic electric charger of an electric vehicle. You can also automatically connect an electric charger to the charging port.
  • the robot 100a may be applied to an AI technology and an XR technology, and may be implemented as a guide robot, a transport robot, a cleaning robot, a wearable robot, an entertainment robot, a pet robot, an unmanned flying robot, a drone, or the like.
  • the robot 100a to which the XR technology is applied may mean a robot that is the object of control / interaction in the XR image.
  • the robot 100a may be distinguished from the XR apparatus 100c and interlocked with each other.
  • the robot 100a When the robot 100a that is the object of control / interaction in the XR image acquires sensor information from sensors including a camera, the robot 100a or the XR apparatus 100c generates an XR image based on the sensor information. In addition, the XR apparatus 100c may output the generated XR image. The robot 100a may operate based on a control signal input through the XR apparatus 100c or user interaction.
  • the user may check an XR image corresponding to the viewpoint of the robot 100a that is remotely linked through an external device such as the XR device 100c, and may adjust the autonomous driving path of the robot 100a through interaction. You can control the movement or driving, or check the information of the surrounding objects.
  • the autonomous vehicle 100b may be implemented by an AI technology and an XR technology, such as a mobile robot, a vehicle, an unmanned aerial vehicle, and the like.
  • the autonomous vehicle 100b to which the XR technology is applied may mean an autonomous vehicle having a means for providing an XR image, or an autonomous vehicle that is the object of control / interaction in the XR image.
  • the autonomous vehicle 100b, which is the object of control / interaction in the XR image is distinguished from the XR apparatus 100c and may be linked with each other.
  • the autonomous vehicle 100b having means for providing an XR image may acquire sensor information from sensors including a camera and output an XR image generated based on the obtained sensor information.
  • the autonomous vehicle 100b may provide a passenger with an XR object corresponding to a real object or an object in a screen by outputting an XR image with a HUD.
  • the XR object when the XR object is output to the HUD, at least a part of the XR object may be output to overlap the actual object to which the occupant's eyes are directed.
  • the XR object when the XR object is output on the display provided inside the autonomous vehicle 100b, at least a portion of the XR object may be output to overlap the object in the screen.
  • the autonomous vehicle 100b may output XR objects corresponding to objects such as a road, another vehicle, a traffic light, a traffic sign, a motorcycle, a pedestrian, a building, and the like.
  • the autonomous vehicle 100b that is the object of control / interaction in the XR image acquires sensor information from sensors including a camera
  • the autonomous vehicle 100b or the XR apparatus 100c may be based on the sensor information.
  • the XR image may be generated, and the XR apparatus 100c may output the generated XR image.
  • the autonomous vehicle 100b may operate based on a user's interaction or a control signal input through an external device such as the XR apparatus 100c.
  • An object of the present invention is to provide a method for transmitting and receiving a downlink signal between a terminal and a base station in a wireless communication system and apparatuses for supporting the same.
  • the present invention provides a method and apparatus for transmitting and receiving a downlink signal between a terminal and a base station in a wireless communication system.
  • a method for receiving a downlink signal by a terminal in a wireless communication system comprising: (i) scheduling a first physical downlink shared channel (PDSCH), and (ii) one valid reference Receiving downlink control information (DCI) associated with a reference signal (RS) set and one invalid RS set; Based on the DCI, (i) one or more first demodulation reference signal (DMRS) port numbers determined by the DCI are associated with the first PDSCH, and (ii) one or more second DMRS determined by the DCI. Obtaining a port number associated with a second PDSCH for another terminal; And receiving the first PDSCH based on the interference channel estimation using the one or more second DMRS port numbers.
  • DCI downlink control information
  • RS reference signal
  • DMRS demodulation reference signal
  • the terminal may receive the first PDSCH based on QCL (Quasi Co Located) information obtained from the one valid RS set.
  • QCL Quadrature Co Located
  • the terminal performs the interference channel estimation using the one or more second DMRS port number, the terminal based on only the one or more second DMRS port number without additional QCL (Quasi Co Located) information Estimating the interference channel.
  • the DCI may include (i) DMRS information for the first PDSCH, and (2) DMRS information for the second PDSCH.
  • the DMRS information may include at least one of the following information.
  • CDM Code Division Multiplexing
  • the terminal is based on the combination of (i) the combination of the DMRS port number for the first PDSCH and (ii) the maximum DMRS port number for the second PDSCH obtained from the DCI, One PDSCH may be received.
  • the combination of the maximum DMRS port numbers for the second PDSCH may be set to a nested structure.
  • the combination of the first maximum DMRS port number corresponding to the rank M may be set to include the combination of the second maximum DMRS port numbers corresponding to the rank N smaller than the rank M (where M, N is a natural number).
  • the terminal determines that the number of codewords (CWs) included in the first PDSCH is 1 based on the DCI being associated with the one valid RS set and the one invalid RS set. Can assume
  • the terminal is based on the DCI is associated with the one valid RS set and the one invalid RS set, the terminal is a multi-user (MU) pairing for the same base station as the other terminal ( pairing) can be assumed.
  • MU multi-user
  • the first PDSCH and the second PDSCH may overlap all or part of the time domain.
  • the DCI includes a first transmission configuration indication (TCI) state and a second TCI state, wherein the one valid RS set is associated with the first TCI state and the one invalid.
  • TCI transmission configuration indication
  • One RS set may be associated with the second TCI state.
  • a terminal for receiving a downlink signal in a wireless communication system comprising: at least one radio frequency (RF) module; At least one processor; And at least one memory operatively coupled to the at least one processor and storing instructions that, when executed, cause the at least one processor to perform a particular operation, the specific operation comprising: (i ) Schedules a first physical downlink shared channel (PDSCH), and (ii) downlink control information associated with one valid reference signal (RS) set and one invalid RS set Receiving (DCI); Based on the DCI, (i) one or more first demodulation reference signal (DMRS) port numbers determined by the DCI are associated with the first PDSCH, and (ii) one or more second DMRS determined by the DCI. Obtaining a port number associated with a second PDSCH for another terminal; And receiving the first PDSCH based on the interference channel estimation using the one or more second DMRS port numbers.
  • RF radio frequency
  • the terminal may communicate with at least one of a mobile terminal, a network, and an autonomous vehicle other than the vehicle including the terminal.
  • a base station for transmitting a downlink signal in a wireless communication system, the base station comprising: at least one radio frequency (RF) module; At least one processor; And at least one memory operatively coupled to the at least one processor and storing instructions that, when executed, cause the at least one processor to perform a particular operation, the specific operation comprising: (i ) Schedules a first physical downlink shared channel (PDSCH), and (ii) downlink control information associated with one valid reference signal (RS) set and one invalid RS set (DCI) to the first terminal, wherein the DCI includes (i) information on one or more first demodulation reference signal (DMRS) port numbers associated with the first PDSCH and (ii) a second for the second terminal. Includes information about one or more second DMRS port numbers associated with the 2 PDSCHs; And transmitting the first PDSCH to the first terminal and transmitting the second PDSCH to the second terminal.
  • RF radio frequency
  • a base station can more freely perform multi-user (MU) scheduling between a plurality of terminals, and the terminal can perform a related DCI (eg, a DCI associated with one valid RS set and one invalid RS set). By receiving it, it can be recognized that the terminal is MU paired with another terminal.
  • MU multi-user
  • the terminal may receive / acquire data signals scheduled to the terminal without considering the QCL source of the MU paired terminal by not using separate QCL information when estimating the interference channel.
  • FIG 1 illustrates an AI device according to an embodiment of the present invention.
  • FIG 2 illustrates an AI server according to an embodiment of the present invention.
  • FIG 3 illustrates an AI system according to an embodiment of the present invention.
  • FIG. 4 is a diagram illustrating a physical channel and a signal transmission method using the same.
  • FIG. 5 is a diagram illustrating a structure of a radio frame based on an NR system to which embodiments of the present invention are applicable.
  • FIG. 6 illustrates a slot structure based on an NR system to which embodiments of the present invention are applicable.
  • FIG. 7 is a diagram illustrating a self-contained slot structure based on an NR system to which embodiments of the present invention are applicable.
  • FIG. 8 is a diagram illustrating one REG structure based on an NR system to which embodiments of the present invention are applicable.
  • FIGS. 9 and 10 illustrate exemplary connection schemes of a TXRU and an antenna element.
  • FIG. 11 is a diagram schematically illustrating a hybrid beamforming structure from a TXRU and a physical antenna perspective according to an embodiment of the present invention.
  • FIG. 12 is a diagram briefly illustrating a beam sweeping operation for a synchronization signal and system information in a downlink (DL) transmission process according to an embodiment of the present invention.
  • FIG. 13 is a diagram schematically illustrating an example of a front loaded DMRS of a first DMRS setting type applicable to the present invention.
  • FIG. 14 is a view showing a time-domain pattern of the PT-RS applicable to the present invention.
  • FIG. 16 is a flowchart illustrating an operation of a terminal according to the present invention
  • FIG. 17 is a flowchart illustrating an operation of a base station according to the present invention
  • FIG. 18 is a diagram illustrating operations of a terminal and a base station applicable to the present invention.
  • 19 is a diagram illustrating a configuration of a terminal and a base station in which the proposed embodiments can be implemented.
  • 20 is a block diagram of a communication device in which proposed embodiments can be implemented.
  • each component or feature may be considered to be optional unless otherwise stated.
  • Each component or feature may be embodied in a form that is not combined with other components or features.
  • some of the components and / or features may be combined to form an embodiment of the present invention.
  • the order of the operations described in the embodiments of the present invention may be changed. Some components or features of one embodiment may be included in another embodiment, or may be replaced with corresponding components or features of another embodiment.
  • the base station is meant as a terminal node of a network that directly communicates with a mobile station. Certain operations described as performed by the base station in this document may be performed by an upper node of the base station in some cases.
  • various operations performed for communication with a mobile station in a network consisting of a plurality of network nodes including a base station may be performed by the base station or network nodes other than the base station.
  • the 'base station' may be replaced by terms such as a fixed station, a Node B, an eNode B (eNB), a gNode B (gNB), an advanced base station (ABS), or an access point. Can be.
  • a terminal may be a user equipment (UE), a mobile station (MS), a subscriber station (SS), or a mobile subscriber station (MSS). It may be replaced with terms such as a mobile terminal or an advanced mobile station (AMS).
  • UE user equipment
  • MS mobile station
  • SS subscriber station
  • MSS mobile subscriber station
  • AMS advanced mobile station
  • the transmitting end refers to a fixed and / or mobile node that provides a data service or a voice service
  • the receiving end refers to a fixed and / or mobile node that receives a data service or a voice service. Therefore, in uplink, a mobile station may be a transmitting end and a base station may be a receiving end. Similarly, in downlink, a mobile station may be a receiving end and a base station may be a transmitting end.
  • Embodiments of the present invention may be supported by standard documents disclosed in at least one of the wireless access systems IEEE 802.xx system, 3rd Generation Partnership Project (3GPP) system, 3GPP LTE system, 3GPP 5G NR system and 3GPP2 system
  • 3GPP 3rd Generation Partnership Project
  • embodiments of the present invention may be supported by 3GPP TS 38.211, 3GPP TS 38.212, 3GPP TS 38.213, 3GPP TS 38.321 and 3GPP TS 38.331 documents. That is, obvious steps or portions not described among the embodiments of the present invention may be described with reference to the above documents.
  • all terms disclosed in the present document can be described by the above standard document.
  • 3GPP NR system will be described as an example of a wireless access system in which embodiments of the present invention can be used.
  • CDMA code division multiple access
  • FDMA frequency division multiple access
  • TDMA time division multiple access
  • OFDMA orthogonal frequency division multiple access
  • SC-FDMA single carrier frequency division multiple access
  • a terminal receives information from a base station through downlink (DL) and transmits information to the base station through uplink (UL).
  • the information transmitted and received by the base station and the terminal includes general data information and various control information, and various physical channels exist according to the type / use of the information they transmit and receive.
  • FIG. 4 is a diagram for explaining physical channels that can be used in embodiments of the present invention and a signal transmission method using the same.
  • the initial cell search operation such as synchronizing with the base station is performed in step S11.
  • the terminal receives a Primary Synchronization Channel (P-SCH) and a Secondary Synchronization Channel (S-SCH) from the base station, synchronizes with the base station, and obtains information such as a cell ID.
  • P-SCH Primary Synchronization Channel
  • S-SCH Secondary Synchronization Channel
  • the terminal may receive a physical broadcast channel (PBCH) signal from the base station to obtain broadcast information in a cell.
  • PBCH physical broadcast channel
  • the terminal may check a downlink channel state by receiving a downlink reference signal (DL RS) in an initial cell search step.
  • DL RS downlink reference signal
  • the UE After completing the initial cell search, the UE receives a physical downlink control channel (PDCCH) and a physical downlink control channel (PDSCH) according to the physical downlink control channel information in step S12. Specific system information can be obtained.
  • PDCCH physical downlink control channel
  • PDSCH physical downlink control channel
  • the terminal may perform a random access procedure such as steps S13 to S16 to complete the access to the base station.
  • the UE transmits a preamble through a physical random access channel (PRACH) (S13), and a RAR (RAR) for the preamble through a physical downlink control channel and a corresponding physical downlink shared channel. Random Access Response) may be received (S14).
  • the UE transmits a Physical Uplink Shared Channel (PUSCH) using scheduling information in the RAR (S15), and a contention resolution procedure such as receiving a physical downlink control channel signal and a corresponding physical downlink shared channel signal (S16).
  • PUSCH Physical Uplink Shared Channel
  • the UE After performing the above-described procedure, the UE subsequently receives a physical downlink control channel signal and / or a physical downlink shared channel signal (S17) and a physical uplink shared channel (PUSCH) as a general uplink / downlink signal transmission procedure.
  • a transmission (Uplink Shared Channel) signal and / or a Physical Uplink Control Channel (PUCCH) signal may be transmitted (S18).
  • UCI uplink control information
  • HARQ-ACK / NACK Hybrid Automatic Repeat and reQuest Acknowledgement / Negative-ACK
  • SR Scheduling Request
  • CQI Channel Quality Indication
  • PMI Precoding Matrix Indication
  • RI Rank Indication
  • BI Beam Indication
  • the UCI is generally transmitted periodically through the PUCCH, but may be transmitted through the PUSCH according to an embodiment (eg, when control information and traffic data should be transmitted at the same time).
  • the UE may transmit UCI aperiodically through the PUSCH by request / instruction of the network.
  • FIG. 5 is a diagram illustrating a structure of a radio frame based on an NR system to which embodiments of the present invention are applicable.
  • Uplink and downlink transmission based on the NR system are based on a frame as shown in FIG. 5.
  • One radio frame has a length of 10 ms and is defined as two 5 ms half-frames (HFs).
  • One half-frame is defined as five 1 ms subframes (SFs).
  • One subframe is divided into one or more slots, and the number of slots in the subframe depends on subcarrier spacing (SCS).
  • SCS subcarrier spacing
  • Each slot includes 12 or 14 OFDM (A) symbols according to a cyclic prefix (CP). Usually when CP is used, each slot contains 14 symbols. If extended CP is used, each slot includes 12 symbols.
  • the symbol may include an OFDM symbol (or a CP-OFDM symbol) and an SC-FDMA symbol (or a DFT-s-OFDM symbol).
  • Table 1 shows the number of symbols for each slot according to the SCS, the number of slots for each frame and the number of slots for each subframe when the general CP is used. It indicates the number of symbols, the number of slots per frame, and the number of slots per subframe.
  • N slot symb represents the number of symbols in a slot
  • N frame ⁇ slot represents the number of slots in a frame
  • N subframe ⁇ slot represents the number of slots in a subframe
  • OFDM (A) numerology eg, SCS, CP length, etc.
  • a numerology eg, SCS, CP length, etc.
  • the (absolute time) section of a time resource eg, SF, slot, or TTI
  • a time unit TU
  • FIG. 6 illustrates a slot structure based on an NR system to which embodiments of the present invention are applicable.
  • One slot includes a plurality of symbols in the time domain. For example, one slot includes seven symbols in the case of a normal CP, but one slot includes six symbols in the case of an extended CP.
  • a carrier includes a plurality of subcarriers in the frequency domain.
  • Resource block is defined as a plurality of consecutive subcarriers (eg, 12) in the frequency domain.
  • a bandwidth part is defined as a plurality of consecutive (P) RBs in the frequency domain and may correspond to one numerology (eg, SCS, CP length, etc.).
  • the carrier may include up to N (eg 5) BWPs. Data communication is performed through an activated BWP, and only one BWP may be activated by one UE. Each element in the resource grid is referred to as a resource element (RE), one complex symbol may be mapped.
  • RE resource element
  • FIG. 7 is a diagram illustrating a self-contained slot structure based on an NR system to which embodiments of the present invention are applicable.
  • the base station and the UE may sequentially perform DL transmission and UL transmission in one slot, and may transmit and receive DL data and transmit and receive UL ACK / NACK for the DL data in the one slot.
  • this structure reduces the time taken to retransmit data in the event of a data transmission error, thereby minimizing the delay of the final data transfer.
  • a time gap of a certain length is required for the base station and the UE to switch from the transmission mode to the reception mode or from the reception mode to the transmission mode.
  • some OFDM symbols at the time of switching from DL to UL in an independent slot structure may be configured as a guard period (GP).
  • the independent slot structure includes both the DL control region and the UL control region.
  • the control regions may be selectively included in the independent slot structure.
  • the independent slot structure according to the present invention may include not only the case of including both the DL control region and the UL control region as shown in FIG. 7 but also the case of including only the DL control region or the UL control region.
  • one slot may be configured in the order of a DL control area / DL data area / UL control area / UL data area, or may be configured in the order of a UL control area / UL data area / DL control area / DL data area.
  • the PDCCH may be transmitted in the DL control region, and the PDSCH may be transmitted in the DL data region.
  • PUCCH may be transmitted in the UL control region, and PUSCH may be transmitted in the UL data region.
  • Downlink Control Information for example, DL data scheduling information, UL data scheduling information, and the like may be transmitted in the PDCCH.
  • DCI Downlink Control Information
  • uplink control information for example, positive acknowledgment / negative acknowledgment (ACK / NACK) information, channel state information (CSI) information, and scheduling request (SR) for DL data may be transmitted.
  • ACK / NACK positive acknowledgment / negative acknowledgment
  • CSI channel state information
  • SR scheduling request
  • PDSCH carries downlink data (eg, DL-shared channel transport block, DL-SCH TB), and modulation methods such as Quadrature Phase Shift Keying (QPSK), 16 Quadrature Amplitude Modulation (QAM), 64 QAM, and 256 QAM are used. Apply.
  • a codeword is generated by encoding the TB.
  • the PDSCH can carry up to two codewords. Scrambling and modulation mapping are performed for each codeword, and modulation symbols generated from each codeword are mapped to one or more layers. Each layer is mapped to a resource together with a DMRS (Demodulation Reference Signal) to generate an OFDM symbol signal, and is transmitted through a corresponding antenna port.
  • QPSK Quadrature Phase Shift Keying
  • QAM 16 Quadrature Amplitude Modulation
  • 64 QAM 64 QAM
  • 256 QAM 256 QAM
  • the PDCCH carries downlink control information (DCI) and a QPSK modulation method is applied.
  • DCI downlink control information
  • One PDCCH is composed of 1, 2, 4, 8, 16 CCEs (Control Channel Elements) according to an aggregation level (AL).
  • One CCE consists of six Resource Element Groups (REGs).
  • REG is defined by one OFDM symbol and one (P) RB.
  • FIG. 8 is a diagram illustrating one REG structure based on an NR system to which embodiments of the present invention are applicable.
  • D represents a resource element (RE) to which DCI is mapped
  • R represents an RE to which DMRS is mapped.
  • DMRS is mapped to the 1st, 5th, 9th RE in the frequency domain direction in one symbol.
  • CORESET is defined as a REG set with a given pneumonology (eg, SCS, CP length, etc.).
  • a plurality of CORESET for one terminal may be overlapped in the time / frequency domain.
  • CORESET may be set through system information (eg, MIB) or UE-specific higher layer (eg, Radio Resource Control, RRC, layer) signaling.
  • system information eg, MIB
  • UE-specific higher layer eg, Radio Resource Control, RRC, layer
  • RRC Radio Resource Control
  • the number of RBs and the number of symbols (up to three) constituting the CORESET may be set by higher layer signaling.
  • PUSCH carries uplink data (eg, UL-shared channel transport block, UL-SCH TB) and / or uplink control information (UCI), and uses a Cyclic Prefix-Orthogonal Frequency Division Multiplexing (CP-OFDM) waveform. Or based on a Discrete Fourier Transform-spread-Orthogonal Frequency Division Multiplexing (DFT-s-OFDM) waveform.
  • DFT-s-OFDM Discrete Fourier Transform-spread-Orthogonal Frequency Division Multiplexing
  • the UE when transform precoding is not possible (eg, transform precoding is disabled), the UE transmits a PUSCH based on a CP-OFDM waveform, and when conversion precoding is possible (eg, transform precoding is enabled), the UE is CP-OFDM.
  • PUSCH may be transmitted based on the waveform or the DFT-s-OFDM waveform.
  • PUSCH transmissions are dynamically scheduled by UL grants in DCI or semi-static based on higher layer (eg RRC) signaling (and / or Layer 1 (L1) signaling (eg PDCCH)). Can be scheduled (configured grant).
  • PUSCH transmission may be performed based on codebook or non-codebook.
  • the PUCCH carries uplink control information, HARQ-ACK and / or scheduling request (SR), and is divided into Short PUCCH and Long PUCCH according to the PUCCH transmission length.
  • Table 3 illustrates the PUCCH formats.
  • PUCCH format 0 carries a maximum of 2 bits of UCI, and is mapped and transmitted based on a sequence. Specifically, the terminal transmits one sequence of the plurality of sequences through the PUCCH of PUCCH format 0 to transmit a specific UCI to the base station. The UE transmits the PUCCH having PUCCH format 0 in the PUCCH resource for the SR configuration only when transmitting the positive SR.
  • PUCCH format 1 carries a UCI of up to two bits in size, and modulation symbols are spread by an orthogonal cover code (OCC) (set differently depending on whether frequency hopping) in the time domain.
  • OCC orthogonal cover code
  • the DMRS is transmitted in a symbol in which a modulation symbol is not transmitted (that is, transmitted by time division multiplexing (TDM)).
  • PUCCH format 2 carries a UCI having a bit size larger than 2 bits, and modulation symbols are transmitted by DMRS and Frequency Division Multiplexing (FDM).
  • the DM-RS is located at symbol indexes # 1, # 4, # 7 and # 10 in a given resource block with a density of 1/3.
  • PN Pulseudo Noise sequence is used for the DM_RS sequence.
  • Frequency hopping may be activated for two symbol PUCCH format 2.
  • PUCCH format 3 is not UE multiplexed in the same physical resource blocks and carries a UCI of a bit size larger than 2 bits.
  • the PUCCH resource of PUCCH format 3 does not include an orthogonal cover code.
  • the modulation symbol is transmitted after being time division multiplexed (DMD) with DMRS.
  • PUCCH format 4 supports multiplexing up to 4 terminals in the same physical resource block, and carries UCI of a bit size larger than 2 bits.
  • the PUCCH resource in PUCCH format 3 includes an orthogonal cover code.
  • the modulation symbol is transmitted after being time division multiplexed (DMD) with DMRS.
  • millimeter wave the short wavelength allows the installation of multiple antenna elements in the same area. That is, since the wavelength is 1 cm in the 30 GHz band, a total of 100 antenna elements can be installed in a 2-dimension array at 0.5 lambda intervals on a 5 * 5 cm panel. Accordingly, in millimeter wave (mmW), a plurality of antenna elements may be used to increase beamforming (BF) gain to increase coverage or to increase throughput.
  • BF beamforming
  • each antenna element may include a TXRU (Transceiver Unit) to enable transmission power and phase adjustment for each antenna element.
  • TXRU Transceiver Unit
  • each antenna element may perform independent beamforming for each frequency resource.
  • a hybrid BF having a number of B TXRUs smaller than Q antenna elements may be considered as an intermediate form between digital beamforming and analog beamforming.
  • the direction of the beam that can be transmitted simultaneously may be limited to B or less.
  • the TXRU virtualization model represents the relationship between the output signal of the TXRU and the output signal of the antenna element.
  • FIG. 9 is a diagram illustrating how a TXRU is connected to a sub-array.
  • the antenna element is connected to only one TXRU.
  • FIG. 10 shows how TXRU is connected to all antenna elements.
  • the antenna element is connected to all TXRUs.
  • the antenna element requires a separate adder as shown in FIG. 10 to be connected to all TXRUs.
  • W denotes a phase vector multiplied by an analog phase shifter. That is, W is the main parameter that determines the direction of analog beamforming.
  • the mapping between the CSI-RS antenna port and the TXRUs may be 1: 1 or 1: 1-to-many.
  • analog beamforming or RF (Radio Frequency) beamforming refers to an operation of performing precoding (or combining) in the RF stage.
  • the baseband stage and the RF stage respectively perform precoding (or combining). This reduces the number of RF chains and the number of digital-to-analog (D / A) (or analog-to-digital) converters while providing near-digital beamforming performance.
  • the hybrid beamforming structure may be represented by N transceiver units (TXRUs) and M physical antennas.
  • TXRUs transceiver units
  • the digital beamforming for the L data layers to be transmitted by the transmitter may be represented by an N * L (N by L) matrix.
  • the converted N digital signals are converted into analog signals through TXRU, and analog beamforming is applied to the converted signals represented by an M * N (M by N) matrix.
  • FIG. 11 is a diagram schematically illustrating a hybrid beamforming structure from a TXRU and a physical antenna perspective according to an embodiment of the present invention.
  • the number of digital beams is L and the number of analog beams is N.
  • the base station is designed to change the analog beamforming in units of symbols to consider a method for supporting more efficient beamforming for a terminal located in a specific region.
  • specific N TXRU and M RF antennas as one antenna panel as shown in FIG. 11, in the NR system according to the present invention, a plurality of antenna panels to which hybrid beamforming independent of each other are applicable may be defined. It is also considered to adopt.
  • the base station uses a plurality of analog beams
  • the analog beams advantageous for signal reception may be different for each terminal.
  • the base station transmits a signal (at least a synchronization signal, system information, paging, etc.) by applying a different analog beam for each symbol within a specific subframe (SF) or slot. Beam sweeping operation that allows the UE to have a reception opportunity is being considered.
  • SF subframe
  • FIG. 12 is a diagram briefly illustrating a beam sweeping operation for a synchronization signal and system information in a downlink (DL) transmission process according to an embodiment of the present invention.
  • a physical resource (or physical channel) through which system information of an NR system to which the present invention is applicable is transmitted in a broadcasting manner is called an xPBCH (physical broadcast channel).
  • xPBCH physical broadcast channel
  • a reference signal transmitted by applying a single analog beam (corresponding to a specific antenna panel) is transmitted.
  • a beam reference signal (Beam RS, BRS), which is RS, may be introduced.
  • the BRS may be defined for a plurality of antenna ports, and each antenna port of the BRS may correspond to a single analog beam.
  • the synchronization signal or the xPBCH may be transmitted by applying all the analog beams in the analog beam group so that any terminal can receive well.
  • the DMRS may be transmitted and received in a first load structure.
  • an additional DMRS (Additional DMRS) other than the first DMRS may be additionally transmitted and received.
  • Front loaded DMRS can support fast decoding.
  • the first FODM symbol location may be indicated by a physical broadcast channel (PBCH).
  • PBCH physical broadcast channel
  • the number of OFDM symbols occupied by the front loaded DMRS may be indicated by a combination of downlink control information (DCI) and radio resource control (RRC) signaling.
  • DCI downlink control information
  • RRC radio resource control
  • Additional DMRS may be set for a high speed terminal. Additional DMRS may be located in the middle / last symbol (s) in the slot. When one Front loaded DMRS symbol is set, Additional DMRS may be allocated to 0 to 3 OFDM symbols. When two front loaded DMRS symbols are set, additional DMRS may be allocated to 0 to 2 OFDM symbols.
  • Front loaded DMRS is composed of two types, and one of the two types may be indicated through higher layer signaling (eg, RRC signaling).
  • higher layer signaling eg, RRC signaling
  • the DMRS configuration type substantially configured for the UE among the two DMRS configuration types may be indicated by higher layer signaling (eg, RRC).
  • DMRS configuration type 1 In the case of the first DMRS configuration type (DMRS configuration type 1), it may be classified as follows according to the number of OFDM symbols to which the front loaded DMRS is allocated.
  • RS density may be set to 6 RE per port in RB (Resource Block).
  • Up to eight ports can be multiplexed based on length-2 F-CDM, length-2 time-code division multiplexing (T-CDM), and FDM methods.
  • T-CDM length-2 time-code division multiplexing
  • FDM methods when the existence of the PT-RS is set by higher layer signaling, the T-CDM may be fixed to [1 1].
  • RS density can be set to 12 REs per port in the RB.
  • DMRS configuration type 2 In the case of the second DMRS configuration type (DMRS configuration type 2), it may be classified as follows according to the number of OFDM symbols to which the front loaded DMRS is allocated.
  • the number of OFDM symbols to which the second DMRS configuration type (DMRS configuration type 2) and the front loaded DMRS are allocated 1
  • RS density may be set to 4 RE per port in RB (Resource Block).
  • the number of OFDM symbols to which the second DMRS configuration type (DMRS configuration type 2) and the front loaded DMRS are allocated 2
  • Up to twelve ports can be multiplexed based on the length-2 F-CDM, length-2 T-CDM and FDM methods.
  • the T-CDM may be fixed to [1 1].
  • RS density may be set to 8 REs per port in the RB.
  • FIG. 13 is a diagram schematically illustrating an example of a front loaded DMRS of a first DMRS setting type applicable to the present invention.
  • FIG. 13 (a) shows a structure in which a DMRS is loaded on one symbol first
  • FIG. 13 (b) shows a structure in which the DMRS is loaded on two symbols first. DMRS with two symbols).
  • ⁇ means a DMRS offset value on the frequency axis.
  • DMRS ports having the same ⁇ may be code division multiplexing in frequency domain (CDM-F) or code division multiplexing in time domain (CDM-T) in the frequency domain.
  • CDM-F code division multiplexing in frequency domain
  • CDM-T code division multiplexing in time domain
  • CDM-F is obtained according to the And CDM-T can be applied based on the Can be applied on the basis of
  • k 'and l' are parameter values that determine the subcarrier index to which the corresponding DMRS is mapped and may have a value of 0 or 1.
  • the DMRS corresponding to each DMRS port may be divided into CDM groups as shown in the following table according to the DMRS configuration type.
  • Table 4 shows parameters for a first DMRS configuration type for PDSCH, and Table 5 shows parameters for a second DMRS configuration type for PDSCH.
  • the terminal may acquire DMRS port configuration information set by the base station through the DCI.
  • the terminal may perform DMRS reception according to the condition as follows.
  • One codeword is scheduled for the terminal and indicates one of ⁇ 2, 9, 10, 11, 30 ⁇ as an index value related to antenna port mapping (for example, the index value of Table 6 or Table 7).
  • an index value related to antenna port mapping for example, the index value of Table 6 or Table 7.
  • the terminal may receive DMRS under the assumption that all remaining orthogonal antenna ports are not associated with PDSCH transmission to other terminals.
  • One codeword is scheduled for the terminal, and the terminal is assigned a DCI indicating one of ⁇ 2, 10, 23 ⁇ as an index value related to antenna port mapping (for example, an index value of Table 8 or Table 9).
  • the terminal may receive DMRS under the assumption that all remaining orthogonal antenna ports are not associated with PDSCH transmission to other terminals.
  • Phase noise related to the present invention will be described. Jitter occurring on the time axis appears as phase noise on the frequency axis. This phase noise randomly changes the phase of the received signal on the time axis as in the following equation.
  • Equation 1 The parameters represent the phase rotation values due to the received signal, time axis signal, frequency axis signal and phase noise, respectively.
  • Equation 2 When the received signal in Equation 1 undergoes a Discrete Fourier Transform (DFT) process, Equation 2 below is derived.
  • DFT Discrete Fourier Transform
  • Equation 2 The parameters represent Common Phase Error (CPE) and Inter Cell Interference (ICI), respectively.
  • CPE Common Phase Error
  • ICI Inter Cell Interference
  • the CPE of Equation 2 has a larger value.
  • the CPE is a kind of carrier frequency offset (CFO) in the WLAN system, but from the viewpoint of the terminal, the CPE and the CFO can be similarly interpreted.
  • the UE removes the CPE / CFO, which is the phase noise on the frequency axis by estimating the CPE / CFO, and the process of estimating the CPE / CFO for the received signal is a process that must be preceded for accurate decoding of the received signal.
  • the base station may transmit a predetermined signal to the terminal so that the terminal can accurately estimate the CPE / CFO
  • the signal may be a pilot signal shared in advance between the terminal and the base station as a signal for estimating the phase noise.
  • the data signal may be a changed or duplicated signal.
  • PT-RS Phase Tracking Reference Signal
  • the UE can receive the PT-RS assuming that PT-RS are present. However, if (i) the layer parameter phaseTrackingRS is not set, or (ii) the higher layer parameter phaseTrackingRS is set but satisfies a predetermined condition (eg, i) the scheduled MCS (Modulation and Coding Scheme) is less than a certain amount, or The number of scheduled RBs is less than a certain number, or iii) the associated Random Network Temporary Identifier (RNTI) is a Random Access RNTI (RA-RNTI), a System Information RNTI (SI-RNTI), a Paging RNTI (P-RNTI), etc. ), The terminal may assume that there is no PT-RS.
  • a predetermined condition eg, i) the scheduled MCS (Modulation and Coding Scheme) is less than a certain amount, or The number of scheduled RBs is less than a certain number, or iii) the associated Random Network Temporary Identifier (RNTI
  • a specific method of transmitting a UL PT-RS of a UE may be different according to whether to enable / disable transform precoding.
  • the UL PT-RS may be transmitted only within a resource block for PUSCH.
  • the UL PT-RS may be mapped to subcarriers for the DMRS port associated with that PT-RS port, and resources allocated for PUSCH transmission based on the frequency density described below. Some of the blocks may be mapped to resource blocks.
  • the DL PT-RS can be transmitted only within a resource block for the PDSCH, can be mapped to subcarriers for the DMRS port associated with that PT-RS port, and based on the frequency density described below It may be mapped to some resource blocks of the resource blocks allocated for PDSCH transmission.
  • FIG. 14 is a view showing a time-domain pattern of the PT-RS applicable to the present invention.
  • the PT-RS may have a different (time) pattern according to the Modulation and Coding Scheme (MCS) level applied.
  • MCS Modulation and Coding Scheme
  • the time density 1 may correspond to Pattern # 1 of FIG. 14
  • the time density 2 may correspond to Pattern # 2 of FIG. 14
  • the time density 4 may correspond to Pattern # 3 of FIG. 14.
  • Parameters ptrs-MCS1, ptrs-MCS2, ptrs-MCS3, and ptrs-MCS4 constituting Table 10 may be defined by higher layer signaling.
  • the PT-RS according to the present invention may be transmitted by being mapped to one subcarrier for each RB (Resource Block), one subcarrier for every two RBs, or one subcarrier for every four RBs.
  • the frequency domain pattern (or frequency density) of the PT-RS may be set according to the size of the scheduled bandwidth.
  • frequency density 2 corresponds to a frequency domain pattern in which PT-RSs are mapped to one subcarrier every two RBs
  • frequency density 4 corresponds to frequency in which PT-RSs are mapped to one subcarrier every four RBs. It may correspond to an area pattern.
  • N RB0 and N RB1 which are reference values of the scheduled bandwidth for determining the frequency density, may be defined by higher layer signaling.
  • the NR system may support DCI format 0_0 and DCI format 0_1 as a DCI format for PUSCH scheduling, and support DCI format 1_0 and DCI format 1_1 as a DCI format for PDSCH scheduling.
  • the NR system may additionally support DCI format 2_0, DCI format 2_1, DCI format 2_2, and DCI format 2_3.
  • DCI format 0_0 is used for scheduling TB (Transmission Block) based (or TB-level) PUSCH
  • DCI format 0_1 is used for TB (Transmission Block) based (or TB-level) PUSCH or (CBG (Code Block Group) Base signal transmission / reception may be used to schedule a CBG-based (or CBG-level) PUSCH.
  • DCI format 1_0 is used for scheduling TB-based (or TB-level) PDSCH
  • DCI format 1_1 is used for TB-based (or TB-level) PDSCH or CBG-based (or CBG-based signal transmission and reception). level) may be used to schedule the PDSCH.
  • DCI format 2_0 is used for notifying the slot format (used for notifying the slot format)
  • DCI format 2_1 is used for notifying PRB and OFDM symbols assuming that a specific UE has no intended signal transmission ( used for notifying the PRB (s) and OFDM symbol (s) where UE may assume no transmission is intended for the UE
  • DCI format 2_2 is used for transmission of Transmission Power Control (TPC) commands of PUCCH and PUSCH.
  • TPC Transmission Power Control
  • the DCI format 2_3 may be used for transmission of a TPC command group for SRS transmission by one or more UEs (used for the transmission of a group of TPC commands for SRS transmissions by one or more UEs).
  • DCI format 1_1 includes an MCS / NDI (New Data Indicator) / RV (Redundancy Version) field for transport block (TB) 1, and the upper layer parameter maxNrofCodeWordsScheduledByDCI in the upper layer parameter PDSCH-Config is n2 (that is, 2), may further include an MCS / NDI / RV field for transport block 2.
  • MCS / NDI New Data Indicator
  • RV Redundancy Version
  • substantially whether the transport block is enabled may be determined by a combination of the MCS field and the RV field. More specifically, when the MCS field for a specific transport block has a value of 26 and the RV field has a value of 1, the specific transport block may be disabled.
  • One CORESET includes N CORESET RB RBs in the frequency domain, and includes N CORESET symb symbols (times 1, 2, and 3 values) in the time domain.
  • One control channel element includes 6 resource element groups (REGs), and one REG is equal to one RB on one OFDM symbol.
  • REGs in CORESET are numbered in order according to a time-first manner. Specifically, the numbering starts from '0' for the first OFDM symbol and the lowest-numbered RB in CORESET.
  • a plurality of CORESETs may be set for one terminal.
  • Each CORESET is related to only one CCE-to-REG mapping.
  • CCE-to-REG mapping for one CORESET may be interleaved or non-interleaved.
  • Configuration information for the CORESET may be set by the upper layer parameter ControlResourceSet IE.
  • the configuration information for CORESET 0 (eg common CORESET) may be set by the upper layer parameter ControlResourceSetZero IE.
  • a list of maximum M Transmission Configuration Indicator (M TCI) state settings may be configured for one UE.
  • the maximum M TCI state setting may be set by a higher layer parameter PDSCH-Config so that (the UE) can decode PDSCH upon detection of a PDCCH including an (intended) DCI intended for the UE and a given serving cell. have.
  • the M value may be determined depending on the capability of the terminal.
  • Each TCI-state includes a parameter for configuring a quasi co-location (QCL) relationship between one or two downlink reference signals and DMRS ports of the PDSCH.
  • the QCL relationship is established based on the upper layer parameter qcl-Type1 for the first downlink reference signal (DL RS) and the upper layer parameter qcl-Type2 (if set) for the second DL RS.
  • the QCL types should not be the same regardless of whether the reference signals are the same DL RS or different DL RS.
  • the QCL types correspond to each DL RS given by the higher layer parameter qcl-Type in the higher layer parameter QCL-Info , and the QCL types may have one of the following values.
  • 'QCL-TypeA' ⁇ Doppler shift, Doppler spread, average delay, delay spread ⁇
  • the terminal receives an activation command used to map the maximum 8 TCI states with a codepoint of a Transmission Configuration Indication (TCI) field in DCI.
  • TCI Transmission Configuration Indication
  • the mapping between the code points of the TCI states and the TCI field in the DCI is slot # (n + 3 * N subframe, ⁇ slot + Applicable from 1).
  • N subframe, ⁇ slot is determined based on Table 1 or Table 2 described above.
  • the UE may assume that the DMRS port (s) of the PDSCH of the serving cell are QCLed with the SS / PBCH block determined in the initial access procedure in terms of 'QCL-TypeD'.
  • the UE assumes that the TCI field exists in the PDCCH of DCI format 1_1 transmitted on the CORESET.
  • the upper layer parameter tci-PresentInDCI is not set for CORESET scheduling the PDSCH or the PDSCH is scheduled by DCI format 1_0, and the time offset between the reception time of the DL DCI and the reception time of the PDSCH corresponding to the threshold Threshold-Sched If greater than or equal to -Offset (the threshold value is determined based on the reported UE capability ), to determine the PDSCH antenna port QCL, the UE determines that the TCI state or QCL assumption for the PDSCH is used for PDCCH transmission. It is assumed to be the same as the TCI state or QCL assumption applied to.
  • the UE uses the TCI-State based on the TCI field included in the DCI in the detected PDCCH to determine the PDSCH antenna port QCL. If the time offset between the reception time of the DL DCI and the reception time of the corresponding PDSCH is greater than or equal to a threshold Threshold-Sched-Offset (the threshold value is determined based on the reported UE capability), the UE may determine the PDSCH of the serving cell.
  • a threshold Threshold-Sched-Offset the threshold value is determined based on the reported UE capability
  • the indicated TCI state should be based on activated TCI states in a slot of the scheduled PDSCH.
  • the terminal assumes that an upper layer parameter tci-PresentInDC I is set to 'enabled' for the CORESET.
  • the UE may determine the time between the reception time of the detected PDCCH in the search region set and the reception time of the corresponding PDSCH.
  • the offset is expected to be greater than or equal to the threshold Threshold-Sched-Offset .
  • both the upper layer parameter tci-PresentInDC I is set to 'enabled' or the upper layer parameter tci-PresentInDC I is not set in RRC connected mode, offset between the reception time of the DL DCI and the reception time of the corresponding PDSCH. If the threshold is smaller than Threshold-Sched-Offset , the terminal assumes the following. (i) The DMRS port (s) of the PDSCH of the serving cell have a QCL relationship with respect to the QCL parameter (s) and RS (s) of the TCI state.
  • the QCL parameter (s) is for the PDCCH QCL indication of the CORESET associated with the search area monitored to the lowest CORESET-ID in the last slot in one or more CORESET in the active BWP of the serving cell monitored by the terminal.
  • the UE may assume that the DM-RS ports of PDSCH of a serving cell are quasi co-located with the RS (s) in the TCI state with respect to the QCL parameter (s) used for PDCCH quasi co-location indication of the CORESET associated with a monitored search space with the lowest CORESET-ID in the latest slot in which one or more CORESETs within the active BWP of the serving cell are monitored by the UE.
  • the UE when the 'QCL-TypeD' of the PDSCH DMRS is different from the 'QCL-TypeD' of the PDCCH DMRS overlapping on at least one symbol, the UE expects to prioritize the reception of the PDCCH associated with the corresponding CORESET.
  • the operation may also apply equally to intra band CA cases (when PDSCH and CORESET are on different CCs). If there is no TCI state including 'QCL-TypeD' among the configured TCI states, the UE indicates a TCI indicated for the scheduled PDSCH regardless of a time offset between a reception time of a DL DCI and a reception time of a corresponding PDSCH. Get different QCL assumptions from state.
  • the terminal For the periodic CSI-RS resource in the higher layer parameter NZP-CSI-RS-ResourceSet with the higher layer parameter trs-Info set, the terminal should assume that the TCI state indicates one of the following QCL type (s):
  • the terminal For the CSI-RS resource in the higher layer parameter NZP-CSI-RS-ResourceSet configured without the higher layer parameter trs-Info and the higher layer parameter repetition , the terminal should assume that the TCI state indicates one of the following QCL type (s). :
  • -'QCL-TypeA' for the CSI-RS resource in the upper layer parameter NZP-CSI-RS-ResourceSet in which the upper layer parameter trs-Info is set, and the upper layer parameter repetition is set if (QCL-TypeD) is applicable.
  • 'QCL-TypeD' for periodic CSI-RS resources in layer parameter NZP-CSI-RS-ResourceSet , or
  • the terminal For the CSI-RS resource in the higher layer parameter NZP-CSI-RS-ResourceSet in which the higher layer parameter repetition is configured, the terminal should assume that the TCI state indicates one of the following QCL type (s):
  • the UE For DMRS of PDCCH, the UE should assume that the TCI status indicates one of the following QCL type (s):
  • the UE For DMRS of PDSCH, the UE should assume that the TCI status indicates one of the following QCL type (s):
  • the T / F resource may refer to a time and / or frequency resource.
  • TRP transmission and reception points
  • two PDSCHs may partially overlap (eg, case # 1 through # 3) or may overlap on one of the time domain or frequency domain of the two PDSCHs (eg case # 4). , # 5).
  • case # 1 / # 2 / # 3 of FIG. 15 two PDSCHs overlap (partially) in both time and frequency.
  • case # 4 of FIG. 15 two PDSCHs do not overlap only on a time axis.
  • Case # 5 of FIG. 15 two PDSCHs overlap in the time axis but do not overlap in the frequency axis.
  • time axis resources of PDSCHs transmitting on different TRPs (or beams) respectively overlap (partially) or overlap (partially) in the time and frequency axis (e.g. case # 5).
  • case # 1, # 2, # 3 the transmission of the two PDSCHs is referred to as non-coherent joint transmission (NC-JT).
  • Single DCI based NC-JT means that PDSCHs transmitted in the different TRPs (or beams) are scheduled by one DCI, respectively. do.
  • Single DCI based NC-JT may include a configuration in which DCI # 1 simultaneously schedules PDSCH # 1 / # 2 for different TRPs.
  • a multi-DCI based NC-JT (hereinafter referred to as Multi DCI based NC-JT for convenience of description) means that PDSCHs transmitted in the different TRPs (or beams) in each DCI are scheduled.
  • the Multi DCI based NC-JT may include a configuration in which DCI # 1 / # 2 simultaneously schedules PDSCH # 1 / # 2.
  • NC-JT can be classified into two types depending on whether the layers transmitted by different TRPs are independent or common.
  • the UE may expect a total of seven layers if TRP # A transmits three layers and TRP # B transmits four layers.
  • the layers are common, if TRP # A transmits three layers and TRP # B transmits three layers, the UE can expect a total of three layers.
  • NC-JT with IL (Independent Layer)
  • NC-JT with CL Common Layer
  • the technical configurations proposed in the present invention are basically based on NC-JT with IL, but the configuration of the present invention is not limited thereto and may be extended to NC-JT with CL.
  • the base station may use two DCIs to schedule different PDSCHs (partially or wholly) overlaid on a specific UE to T / F resources that overlap each other. This may be similar to multiplexing the specific UE with other UEs. This is because a PDSCH scheduled by one DCI acts as an interference to a PDSCH scheduled by another DCI. (Weight lifting)
  • the UE can design a reception filter or define a reception beam differently so as to minimize interference between different PDSCHs (for example, two PDSCHs are received through different reception beams).
  • the UE may miss one of the two DCIs.
  • the missing of the signal may mean that the signal itself is not transmitted or that the signal is transmitted, but the signal is not normally detected / decoded. Accordingly, the UE may not know (ie, may not recognize) the transmission of the PDSCH itself scheduled by the missed DCI. Accordingly, the UE must recognize the presence of the PDSCH scheduled by the missed DCI through blind detection. That is, this may increase the complexity of the terminal.
  • the terminal may use an IRC (Interference Rejection Combining) filter to remove the interference between PDSCH.
  • the terminal may recognize the DMRS port (s) corresponding to each of the PDSCH based on the received DCI, and then calculate the IRC receiver filter through channel estimation.
  • the terminal when the terminal misses one of the DCIs, the terminal may not recognize the DMRS port (s) of the PDSCH scheduled by the missed DCI. Accordingly, the terminal should perform blind detection to detect the DMRS port (s). In other words, this increases the complexity of the terminal. In addition, when the terminal detects a wrong DMRS port (s) (that is, when the base station does not detect the intended DMRS port (s)), rather, the performance is reduced.
  • the base station may not only perform other than the DMRS port (s) of the PDSCH scheduled by the DCIs through DCIs used for NC-JT mode / transmission. DCIs need to inform the DMRS port (s) of the PDSCH scheduling.
  • DMRS port combinations may not be suitable for CoMP (Coordinated Multiple Point) transmission.
  • DMRS port 0,1 when DMRS port 0,1 is indicated as a combination of DMRS ports, the two ports of DMRS port 0, 1 should be QCLed. Therefore, in this case, it may be impossible for the DMRS port 0 and the DMRS port 1 to be transmitted in different TRPs.
  • the terminal which is instructed / set according to the NC-JT state / mode transmission is deleted and some rows not supporting the new table (eg, NC-JT state / mode) other than Table 7 are deleted.
  • the DMRS port combination based on a row in which a row for the NC-JT state / mode is further defined) may be indicated / configured from the base station.
  • RS reference signal
  • TCI transmission configuration indicator
  • the present invention provides a method of signaling two or more RS sets for the TCI state or by setting two or more TCI states to a specific UE so that the specific UE can recognize that it is an NC-JT situation. Suggest.
  • RS set two RS sets are provided for the UE, the UE having ambiguity as to which RS set provides QCL information (eg, spatial QCL) of the DMRS associated with the PDSCH scheduled by the corresponding DCI. May have Therefore, the present invention will be described in detail with respect to a signaling method for informing an appropriate or implicit method of which RS set should be applied to a corresponding UE.
  • QCL information eg, spatial QCL
  • the base station may indicate to the terminal a single or multi-DCI based NC-JT by defining / configuring a plurality of RS sets in one TCI state. Subsequently, the base station can provide additional information to the terminal so that the terminal can select the RS set related to the QCL information of the PDSCH scheduled by the DCI among a plurality of configured RS sets. For example, the base station may provide the additional information to the terminal by utilizing CWI and / or DMRS port related field information of the DCI.
  • the base station may define one RS set in one TCI state and indicate / set a plurality of TCI states to the terminal through a specific DCI. Through this, the base station may indicate to the terminal that the single or multi-DCI based NC-JT.
  • the existing method of searching for one RS set from the plurality of RS sets described above is applied. Can be.
  • the terminal is indicated by one TCI state in which two or more RS sets are defined
  • the terminal is indicated by two or more TCI states through one DCI. Is changed to “selecting one RS set from multiple RS sets” can be extended to “selecting one TCI state from multiple TCI states”.
  • At least one of the following signaling methods may be applied to the BS instructing the UE that NC-JT is applied / configured.
  • the following example is only one example applicable to the present invention, and the configuration proposed in all the following methods may be equally applied even when indicating that the NC-JT is applied / configured according to a signaling method other than the following examples. have.
  • the base station may indicate a single or multi-DCI based NC-JT to the terminal by defining a plurality of RS sets in one TCI state.
  • the base station may define one RS set in one TCI state and indicate the terminal to a plurality of TCI states through one DCI, thereby instructing the terminal to be single or multi-DCI based NC-JT.
  • Random Network Temporary Identifier (RNTI) and C-RNTI (Cell RNTI) for NC-JT are defined differently. Accordingly, the base station may instruct the terminal that the NC-JT is applied / configured by transmitting the scrambled DCI to the terminal using the RNTI for NC-JT instead of the C-RNTI. Correspondingly, when the terminal successfully decodes the received DCI using the RNTI for NC-JT, based on this, the terminal may recognize that the base station has instructed the terminal to NC-JT.
  • the DCI (s) paired with the NC-JT may mean a case where each PDSCH scheduled by the DCI (s) overlaps (partially) on T / F resources. .
  • DMRS port combinations included in the CDM group for each DMRS configuration type may be defined as shown in the following table.
  • a table related to the newly proposed DMRS port combination may be defined as shown in the following table.
  • the signaling method proposed by the present invention may be implemented based on Table 13 below.
  • FL and LD may refer to Front Load and Large Delay, respectively.
  • “For single FL DMRS” in a comment item may mean that a corresponding DMRS port combination is applicable when the number of FL DMRS symbols is one.
  • “CDM group # 1 for LD” in the comment item may mean that the corresponding DMRS ports in the CDM group # 1 are not CDM-F for large delay.
  • the terminal When the base station instructs the terminal in the NC-JT state / mode, the terminal corresponds to the DMRS port (s) information of the PDSCH corresponding to the DCI received and successfully decoded and other DCI paired in the NC-JT state / mode It can be expected / assumed to include DMRS port (s) information of the PDSCH.
  • the base station instructs the terminal to transmit a single TRP (for example, includes only one RS set in the TCI state) and sets the DMRS configuration type to 1, the terminal expects the above-described Table 6 or Table 7 It is assumed that DMRS port information can be obtained from DCI.
  • the DMRS port information may include at least one of ⁇ CDM group number, rank, DMRS port combination, front-load DMRS symbol number, RS set indicating QCL information of the DMRS port ⁇ .
  • the terminal can obtain the DMRS port information from the DCI by expecting / assuming Table 13 above.
  • DMRS port (s) for the desired PDSCH represents the DMRS port information of the PDSCH scheduled by the DCI that the current UE successfully decoded.
  • DMRS port (s) for interfering PDSCH indicates DMRS port information of a PDSCH scheduled by a DCI paired with a DCI successfully decoded by the UE and an NC-JT state / mode.
  • the terminal may expect / assume that the DMRS port (s) combinations indicated by the DCIs paired in the NC-JT state / mode are symmetric with each other.
  • two DMRS ports combinations are defined by being switched to each other in a DMRS port (s) for a desired PDSCH and a DMRS port (s) for an interfering PDSCH.
  • DMRS port combinations (0, 1, 4) and (2, 6) are switched to each other so that DMRS port (s) for desired PDSCH and DMRS port (s) for interfering, respectively.
  • Each defined as PDSCH. Accordingly, when two DCIs paired in the NC-JT state / mode indicate value 22 and 23, respectively, even if the terminal misses any one of the two DCIs, the terminal succeeds in decoding.
  • the DMRS port (s) of the PDSCH scheduled by the DCI as well as the DMRS port (s) of the PDSCH scheduled by the other DCI can be obtained.
  • the terminal When the base station instructs / sets one TCI state in which two or more RS sets are defined to the terminal and the DMRS port indicated by the DCI transmitted by the base station is included in only one specific CDM group, the terminal may be configured as the CDM group. Based on the information, the RS set providing the QCL information of the DMRS of the PDSCH scheduled by the DCI may be selected.
  • the CDM group information may be defined as shown in Table 12.
  • CDM groups # 1 / # 2 / # 3 are mapped in order of 1: 1 with RS set #A, #B, and #C set in the TCI state. Accordingly, when the DMRS port indicated to the UE belongs to a specific CDM group, the UE may assume / expect that QCL information of the DMRS port is derived from an RS set mapped to the specific CDM group according to the third method. .
  • RS sets in Table 13 may not be explicitly displayed.
  • “RS sets” in Table 13 are merely disclosed as separate items for better understanding of the present invention, and the same configuration may be applied even if the corresponding items are not explicitly defined.
  • the UE may expect / assuming “DMRS port combination of the maximum applicable interference PDSCH” as the DMRS port (s) of the PDSCH scheduled by another DCI paired in the NC-JT mode / state.
  • the DMRS port combination of the maximum applicable interference PDSCH may mean a combination with the highest number of ports among the DMRS port combinations to be used by the interference PDSCH.
  • the DMRS port combination of the interfering PDSCH may be selected only within the indicated applicable maximum interfering PDSCH DMRS port combination.
  • the maximum possible interference DMRS port combinations between semi-static TRPs are preset, and each TRP dynamically selects a DMRS port subcombination within the combinations to provide PDSCH and DMRS to the UE.
  • TRP #B allows to adjust rank without dynamic coordination with TRP #A.
  • the UE successfully decodes another DCI related to the PDSCH of TRP #B the UE does not have (# 2, # 3, # 6) the DMRS port of the PDSCH of the TRP #B (# 2). , # 6).
  • the terminal can find the DMRS port used by the actual TRP #B among the DMRS port # 2, # 3, # 6. Even in this case, the terminal can be sure that the signal is not transmitted using DMRS port # 7, even if the terminal performs blind detection can reduce the complexity of the terminal.
  • the above-described technical configuration according to the fourth method may be extended even when the base station instructs the terminal in the NC-JT mode / state but the TRP #B does not transmit the PDSCH to the terminal.
  • TRP #B may allocate DMRS port # 2 and # 6 to the terminal indicated by the NC-JT mode / status, and allocate DMRS port # 3 to the other terminal.
  • the terminal indicated the NC-JT mode / state may recognize that the DMRS port ⁇ # 2, # 6 ⁇ is utilized from the DCI associated with the PDSCH transmitted in TRP #B. In this case, based on the above operation, the terminal ignores the existence of DMRS port # 3 itself.
  • the terminal configured with the NC-JT mode / state can recognize that the DMRS port ⁇ # 2, # 6 ⁇ is utilized from the paired DCI, it is expected / assumed that the DMRS port # 3 can also be set to another terminal.
  • the terminal complexity can be reduced.
  • scheduling restriction may be applied from the base station perspective.
  • the second solution although the limitation is not applied to the scheduling of the base station, there is a disadvantage that the terminal complexity may be increased.
  • the operation of the terminal is identical to the operation of the terminal according to the second solution, and the second solution may be more preferable.
  • the terminal can still assume / expect that the DMRS port # 7 is not used.
  • a DMRS port combination with a higher rank may be set to always include a DMRS port combination with a lower rank. That is, the combination of DMRS ports in the same CDM group may be configured as a nested structure.
  • the TRP # B may transmit the PDSCH based on the DMRS port (# 2, # 6) or the DMRS port # 2 rather than the DMRS ports (# 2, # 3, # 6).
  • the above-described DMRS table of Table 13 may have a nested structure as shown in Tables 14 and 15 below.
  • Table 14 shows a nested structure when the number of front loaded symbols is 1
  • Table 15 shows a nested structure when the number of front loaded symbols is 2.
  • the DMRS ports of CDM group # 2 are (2), (2, 6), (2, 3, 6), As the rank increases to (2, 3, 6, 7), it may be configured to include the DMRS port of the previous rank.
  • the nested structure may be equally applied even when the rank of the CDM group # 1 is 2, 3, or 4.
  • the DMRS ports of CDM group # 1 are (0), (0, 4), (0, 1, 4), As the rank increases to (0, 1, 4, 5), it may be configured to include the DMRS port of the previous rank. Such a nested structure may be equally applied even when the rank of the CDM group # 2 is 2, 3, or 4.
  • the UE when the maximum possible DMRS port combination is (2, 3, 6) for the DMRS port (s) for interfering PDSCH, the UE first transmits whether the DMRS port # 3 exists (or is transmitted based on the DMRS port # 3). Whether there is a DMRS or a PDSCH).
  • the UE if it is detected that the DMRS port # 3 exists (or if there is a DMRS or PDSCH transmitted based on the DMRS port # 3), the UE always has the DMRS port # 2 and # 6 It can be expected / assumed that there is a (or that there is a DMRS or PDSCH transmitted based on DMRS ports # 2 and # 6). Accordingly, the terminal may not perform blind detection on DMRS ports # 2 and # 6.
  • the UE is in the order of DMRS port # 6 and # 2 Blind detection can be performed. Subsequently, when it is detected that the DMRS port # 6 exists (or when the presence of the DMRS or PDSCH transmitted based on the DMRS port # 6) is detected, the UE always indicates that the DMRS port # 2 is always present (or It can be expected / assumed that there is a DMRS or PDSCH transmitted based on DMRS port # 2. Accordingly, the terminal may not perform blind detection on DMRS port # 2. As a result, according to the present method, the blind detection complexity of the UE with respect to the existence of the DMRS port can be reduced.
  • the DMRS port combination included in the nested structure may be set to change.
  • DMRS ports belonging to CDM groups # 1 and # 2 are DMRS port (0), DMRS port (0, 1) / (2), DMRS port ( 2, 3) can be increased in order. This is because, when the number of front-loaded symbols is one, the number of DMRS ports in each CDM group is limited to two.
  • DMRS ports belonging to CDM groups # 1 and # 2 are DMRS port (0), DMRS port (0, 4), and DMRS port (0, 1, 4), respectively, when the rank increases.
  • DMRS port (0, 1, 4, 5) / (2), DMRS port (2, 6), DMRS port (2, 3, 6), DMRS port (2, 3, 6, 7) Can be. The reason for this is as follows.
  • different TRPs may simultaneously service one UE.
  • a specific TRP may be located (physically) far from the terminal point of view.
  • a delay spread may be set very long by the TRP. Accordingly, when the DMRS port is multiplexed with the CDM-F, performance may be reduced when the DMRS port is separated.
  • CoMP may be supported when the moving speed of the terminal is less than a certain threshold. Accordingly, in the case of CoMP, the time axis correlation of the channel is very high. That is, CDM-T can provide higher DMRS port separation performance than CDM-F. Therefore, CDM-T may be given priority over CDM-F for the DMRS port.
  • the terminal is a sample of each DMRS port per one OFDM symbol in one RB As a result, six samples can be obtained. At this time, the interval of the six samples is 2. Therefore, even when frequency selectivity is large due to a very long delay spread (when the channel correlation of the frequency axis is low), the sample interval is small, which may be advantageous in terms of channel estimation performance.
  • the DMRS port is multiplexed with CDM-F, and the UE can obtain three samples as samples of each DMRS port per OFDM symbol in one RB. have. At this time, the interval of the three samples is four. Therefore, when the frequency selectivity (selectivity) is large as described above, the channel estimation performance is relatively reduced.
  • the DMRS port number may be set to a DMRS port having the smallest index for each CDM group.
  • the subcarrier index to which the PTRS in one RB is mapped may be determined based on Table 16.
  • the PTRS includes at least one subcarrier on which a DMRS port having the smallest index is mapped based on a DMRS port having the smallest index among the DMRS ports indicated by DCI, a DMRS configuration type, and an upper layer parameter resource elementOffset . Can be defined.
  • PTRS is always It may be mapped to DMRS port # 0 or DMRS port # 2. Accordingly, even if the terminal does not detect the DCI paired in the NC-JT mode / state, the PTRS port of the PDSCH scheduled by the missed DCI is limited to correspond to one of DMRS port # 0 or # 2. Can be.
  • the DMRS port combination of the interfering PDSCH indicated by the DCI successfully decoded by the UE is different from the DMRS port combination actually transmitted, the DMRS port to which the PTRS port is mapped may not be changed. have.
  • the UE can acquire the PTRS port of the interfering PDSCH without additional blind detection.
  • the UE can measure the Common Phase Error (CPE) through the PTRS port of the interfering PDSCH, it can be used to improve the channel estimation performance for the interfering PDSCH.
  • CPE Common Phase Error
  • the DMRS port of the interfering PDSCH indicated by the DCI successfully decoded by the UE is a DMRS port ⁇ 2, 3, 6 ⁇ .
  • the terminal may expect / assume that the PTRS port is always associated with DMRS port # 2 regardless of the actual rank of the interfering PDSCH.
  • the terminal When the base station instructs the terminal in the NC-JT mode / state, the terminal is each of the start and length indicator value (SLIV) indicated by the two DCI paired in the NC-JT mode / state or each of the two DCI scheduling It can be expected / assumed that the additional DMRS positions of the PDSCHs are identical.
  • SIV start and length indicator value
  • PDSCHs transmitted by each TRP may overlap (partially) on T / F resources.
  • the number of additional DMRSs (symbols) and a location where the additional DMRSs are mapped may be determined by SLIV. Therefore, if the SLIV indicated by the two DCIs are different, additional DMRS (symbol) numbers and positions may be determined differently from each other.
  • the base station may transmit rate matching or puncturing a PDSCH region overlapping the additional DMRS.
  • the location of additional DMRS of PDSCH scheduled by DCI # 0 is symbol index (3, 6, 9), while DCI # 1 (DCI paired with DCI # 0 and NC-JT mode / state) is scheduled.
  • the position of additional DMRS of PDSCH is symbol index (3, 5, 8, 11).
  • the two PDSCHs may be rate matched (or punctured) with respect to the OFDM symbol indexes (3, 5, 6, 8, 9, 11) and transmitted. Accordingly, throughput may be greatly reduced due to high signaling overhead.
  • the terminal misses another DCI, ambiguity may occur for additional DMRS positions of the PDSCH scheduled by the missed DCI. Accordingly, the terminal cannot perform or consider rate matching (or puncturing).
  • the terminal has the same number of additional DMRS positions and / or symbols in each SLIV (Start and Length Indicator Value) indicated by two DCIs paired in NC-JT mode / state or in each PDSCH scheduled by the two DCIs. It can be expected / assumed, and accordingly the base station may schedule a PDSCH to the terminal.
  • SLIV Start and Length Indicator Value
  • the first to fifth methods described above may be equally applied to a DMRS port indication method for improving MU performance.
  • the first to fifth methods propose a signaling method in which DCIs paired in the NC-JT mode / state inform DMRS port information between each other.
  • the terminal in view of receiving a PDSCH scheduled by the terminal, the PDSCH of another MU-paired terminal serves as interference. In addition, the terminal cannot detect a DCI for another terminal.
  • this MU situation may be interpreted in the same manner as when the terminal misses one of two DCI paired in the NC-JT mode / state. Accordingly, the first to fifth methods described above may be equally applied to a DMRS port indication method for improving MU performance.
  • the base station may further inform the UE of the QCL information of the DMRS port of the PDSCH scheduled by another DCI through the RS set.
  • a beam (or resource) used by another base station to another terminal may be limited to an RS set preset in the TCI state. Otherwise, when the terminal estimates the interference channel, the terminal may estimate the interference channel based on the wrong QCL information.
  • an invalid RS set may be defined to prevent the terminal from using wrong QCL information without restriction on a QCL source (eg, RS set) when the base station schedules another terminal.
  • a QCL source eg, RS set
  • the terminal may not use the QCL information, and thus the base station also MU pairing another terminal with an arbitrary QCL source (eg, RS set) with the terminal. can do.
  • the present invention proposes the following method.
  • the UE may use a DMRS port (s) for another DCI indicated by the DCI having successfully decoded.
  • Information eg, DMRS port (s) information of a PDSCH scheduled by another DCI paired in an NC-JT mode / state
  • the terminal may not use QCL information when estimating an interference channel based on DMRS ports associated with an invalid RS set.
  • an invalid RS set may be defined based on the following reasons.
  • the invalid RS set may be defined to inform the UE that the DMRS port (s) for interfering PDSCH in Table 13 is the DMRS port of the PDSCH of another UE, despite being in the NC-JT mode / state. If the invalid RS set is not defined, the terminal cannot distinguish whether the situation is an NC-JT situation or an MU situation. Therefore, a separate DCI field for signaling this may be defined, or a separate signaling (eg, description which indicates whether NC-JT or MU is) in the TCI state may be defined.
  • the base station may set the following two TCI state to the UE # 1 in advance.
  • the number of TCI states that should be set for the UEs increases.
  • efficient setting becomes difficult as the number of UEs capable of MU pairing increases.
  • the preset TCI state # 1 may no longer be valid.
  • the present invention defines an invalid RS set. Accordingly, each terminal does not need to consider a QCL source (eg, RS set) related to the MU paired terminal anymore. As a result, the base station can MU pair any other terminal for a particular terminal, which can be very advantageous in terms of scheduling.
  • a QCL source eg, RS set
  • the terminal may assume / expect that the QCL information of DMRS port ⁇ 0, 4 ⁇ is derived from RS set #A. . Meanwhile, the terminal may recognize / assume that the DMRS port ⁇ 2, 6 ⁇ is a DMRS port of a PDSCH scheduled to another terminal that interferes with the terminal. Subsequently, the terminal may estimate an interference channel using the DMRS port (eg, DMRS port ⁇ 2, 6 ⁇ ). Accordingly, the terminal can estimate the interference channel without using the QCL information.
  • the DMRS port eg, DMRS port ⁇ 2, 6 ⁇
  • the UE may expect / assume “DMRS port combination of the maximum applicable interference PDSCH” as a DMRS Port (s) for interfering PDSCH DMRS port (s).
  • the DMRS port combination of the maximum applicable interference PDSCH may mean a combination with the highest number of ports among the DMRS port combinations to be used by the interference PDSCH.
  • the terminal may expect / assume a DMRS table defined according to the aforementioned methods 4-1, 4-2, and 4-3. Accordingly, in the MU situation, the terminal is based on the DMRS table defined according to the above-described methods 4-1, 4-2, and 4-3, PDSCH DMRS port (s) information scheduled to the terminal and PDSCH DMRS port (s) information scheduled to another terminal can be obtained. Based on this, the terminal may estimate the interference channel without using the QCL information.
  • the terminal when the TCI state indicated by the base station includes an invalid RS set, the terminal may assume / expect 1 as the number of scheduled CWs. Otherwise, the terminal may assume / expect 2 as the number of scheduled CWs.
  • the UE may distinguish between an NC-JT situation or a multi-user (MU) situation based on whether a TCI state having a plurality of RS sets includes an invalid RS set.
  • NC-JT situation or a multi-user (MU) situation based on whether a TCI state having a plurality of RS sets includes an invalid RS set.
  • MU multi-user
  • the plurality of TRPs transmit the PDSCH, respectively, so that the UE may expect / assuming that the plurality of CWs are scheduled.
  • a channel long-term parameter eg, average gain
  • the terminal may expect / assume only one CW.
  • the base station does not schedule two or more CWs to the terminal, and the terminal may not expect / assuming that two or more CWs are scheduled by the base station.
  • the terminal may expect / assume 1 or 2 scheduled CW numbers.
  • the terminal may expect / assume 1 as the scheduled number of CWs.
  • the terminal may transmit A / N information having a size of 1 bit (when 1 CW is scheduled) or 2 bit (when 2 CW is scheduled) to the base station through a PUCCH resource for A / N.
  • FIG. 16 is a flowchart illustrating an operation of a terminal according to the present invention
  • FIG. 17 is a flowchart illustrating an operation of a base station according to the present invention
  • FIG. 18 is a diagram illustrating operations of a terminal and a base station applicable to the present invention.
  • the base station may transmit a first DCI scheduling the first PDSCH to the first terminal (S1812), and transmit a second DCI scheduling the second PDSCH to the second terminal (S1814).
  • the base station may transmit the first DCI to the first terminal through a first TRP, and transmit the second DCI to the second terminal through a second TRP (S1710).
  • the first terminal schedules the first PDSCH, and (ii) the first terminal associated with one valid reference signal (RS) set and one invalid RS set.
  • One DCI may be received (S1610, S1812).
  • the first terminal based on the first DCI, (i) at least one first demodulation reference signal (DMRS) port number determined by the first DCI is associated with the first PDSCH, (ii) the In operation S1620, at least one second DMRS port number determined by the second DCI may be associated with a second PDSCH for another UE.
  • the first terminal may include one or more first DMRS port numbers associated with the first PDSCH and one or more second associated with the second PDSCH (scheduled for the second terminal). DMRS port number can be obtained.
  • the second terminal also, similar to the operation of the first terminal described above, from the second DCI one or more first DMRS port number associated with the first PDSCH and the second (scheduled for the second terminal) One or more second DMRS port numbers associated with the PDSCH may be obtained.
  • the base station may transmit a first PDSCH to the first terminal (S1822) and may transmit a second PDSCH to the second terminal (S1824).
  • the base station may transmit the first PDSCH to the first terminal through a first TRP and transmit the second PDSCH to the second terminal through a second TRP (S1720).
  • the first terminal may receive / detect the first PDSCH based on the interference channel estimation using the information obtained from the first DCI (eg, the one or more second DMRS port numbers) (S1832). ). More specifically, the first terminal may receive the first PDSCH and obtain corresponding data information from the first PDSCH based on the interference channel estimation (S1630).
  • the first DCI eg, the one or more second DMRS port numbers
  • the second terminal also, similar to the operation of the first terminal described above, based on the interference channel estimation using the information obtained from the second DCI (eg, the one or more first DMRS port number), the second The PDSCH may be received / detected (S1834). More specifically, the second terminal may receive the second PDSCH and obtain corresponding data information from the second PDSCH based on the interference channel estimation.
  • the second DCI eg, the one or more first DMRS port number
  • the first terminal may receive the first PDSCH.
  • QCL Quadrature Co Located
  • the first terminal performs the interference channel estimation using the one or more second DMRS port number, the first terminal is the one or more second DMRS port without separate QCL (Quasi Co Located) information Estimating the interference channel based only on the number.
  • QCL Quadrature Co Located
  • the first DCI (and / or the second DCI) may include (i) DMRS information for the first PDSCH, and (2) DMRS information for the second PDSCH.
  • the DMRS information may include one or more of the following information.
  • CDM Code Division Multiplexing
  • the first terminal is based on (i) a combination of DMRS port numbers for the first PDSCH and (ii) a maximum DMRS port number for the second PDSCH, obtained from the first DCI.
  • the first PDSCH may be received.
  • the combination of the maximum DMRS port number for the second PDSCH is a nested structure (eg, a rank N in which the combination of the first maximum DMRS port number corresponding to the rank M is smaller than the rank M). And a corresponding combination of second maximum DMRS port numbers).
  • the first terminal based on the first DCI being associated with the one valid RS set and the one invalid RS set, the first terminal has a number of codewords (CWs) included in the first PDSCH. Can assume Similarly, based on the second DCI associated with the one valid RS set and the one invalid RS set, the second terminal may assume that the number of CWs included in the second PDSCH is one. .
  • the first terminal is connected to the same base station as the other terminal (eg, the second terminal). It can be assumed that multi-user (MU) pairing is performed for each other.
  • the second terminal is the same as the other terminal (eg, the first terminal). It may be assumed that multi-user (MU) pairing is performed for the base station.
  • the first PDSCH and the second PDSCH may be configured to overlap all or part of the time domain.
  • the first DCI (and / or the second DCI) may include a plurality of TCI states (eg, a first TCI state and a second TCI state).
  • the one valid RS set may be associated with the first TCI state
  • the one invalid RS set may be associated with the second TCI state.
  • all the above-described examples may be implemented in combination / combination with each other as long as they are not compatible.
  • the terminal and the base station according to the present invention can perform their combined / combined operation as long as all the examples described above (in particular, the above-described examples based on FIGS. 16 to 18) are not compatible.
  • FIG. 19 is a diagram illustrating a configuration of a terminal and a base station in which the proposed embodiment can be implemented.
  • the terminal and the base station illustrated in FIG. 19 operate to implement the above-described downlink signal transmission / reception method between the terminal and the base station.
  • a UE 1001 may operate as a transmitting end in uplink and a receiving end in downlink.
  • the base station eNB or gNB 1100 may operate as a receiver in uplink and as a transmitter in downlink.
  • the terminal and the base station may include transmitters 1010 and 1110 and receivers 1020 and 1120, respectively, to control transmission and reception of information, data and / or messages. Or antennas 1030 and 1130 for transmitting and receiving messages.
  • the terminal and the base station each include processors 1040 and 1140 for performing the above-described embodiments of the present invention.
  • the processor 1040, 1140 may be configured to control the memory 1050, 1150 and / or the transmitters 1010, 1110 and / or the receivers 1020, 1120 to implement the above-described / proposed procedures and / or methods. Can be.
  • processors 1040 and 1140 include communication modems designed to implement wireless communication technology (eg, LTE, NR).
  • the memories 1050 and 1150 are connected to the processors 1040 and 1140 and store various information related to the operation of the processors 1040 and 1140.
  • the memory 1050, 1150 may include software code that includes instructions for performing some or all of the processes controlled by the processor 1040, 1140, or for performing the procedures and / or methods described / proposed above. Can be stored.
  • the transmitters 1010, 1110 and / or receivers 1020, 1120 are connected with the processors 1040, 1140 and transmit and / or receive wireless signals.
  • the processors 1040 and 1140 and the memories 1050 and 1150 may be part of a processing chip (eg, a System on a Chip, SoC).
  • the transmitter and the receiver included in the terminal and the base station include a packet modulation and demodulation function, a high speed packet channel coding function, an orthogonal frequency division multiple access (OFDMA) packet scheduling, and a time division duplex (TDD) for data transmission. Packet scheduling and / or channel multiplexing may be performed.
  • the terminal and the base station of FIG. 19 may further include a low power radio frequency (RF) / intermediate frequency (IF) unit.
  • RF radio frequency
  • IF intermediate frequency
  • 20 is a block diagram of a communication device in which proposed embodiments can be implemented.
  • the device shown in FIG. 20 may be a user equipment (UE) and / or a base station (eg, eNB or gNB) adapted to perform the above-described mechanism, or any device performing the same task.
  • UE user equipment
  • base station eg, eNB or gNB
  • the apparatus may include a digital signal processor (DSP) / microprocessor 2210 and a radio frequency (RF) module (transceiver) 2235.
  • the DSP / microprocessor 2210 is electrically connected to the transceiver 2235 to control the transceiver 2235.
  • the device may be adapted to a power management module 2205, a battery 2255, a display 2215, a keypad 2220, a SIM card 2225, a memory device 2230, an antenna 2240, and a speaker (depending on the designer's choice). 2245 and input device 2250.
  • FIG. 20 may represent a terminal including a receiver 2235 configured to receive a request message from a network and a transmitter 2235 configured to transmit timing transmit / receive timing information to the network.
  • a receiver and a transmitter may constitute a transceiver 2235.
  • the terminal may further include a processor 2210 connected to a transceiver (receiver and transmitter) 2235.
  • the 20 may also show a network device including a transmitter 2235 configured to transmit a request message to a terminal and a receiver 2235 configured to receive transmission and reception timing information from the terminal.
  • the transmitter and receiver may configure transceiver 2235.
  • the network further includes a processor 2210 coupled to the transmitter and the receiver.
  • the processor 2210 may calculate a latency based on the transmission / reception timing information.
  • a processor included in a terminal or a communication device included in the terminal
  • a processor included in a base station or a communication device included in the base station
  • the terminal at least one radio frequency (RF) module; At least one processor; And at least one memory operatively connected to the at least one processor, and storing instructions that, when executed, cause the at least one processor to perform the following operation.
  • the communication device included in the terminal may be configured to include the at least one processor and the at least one memory, and the communication device includes the at least one RF module or the at least one RF. It may be configured to be connected to the at least one RF module without a module.
  • At least one processor included in the terminal controls the at least one RF module to (i) establish a first physical downlink shared channel (PDSCH).
  • PDSCH physical downlink shared channel
  • DCI downlink control information
  • RS valid reference signal
  • DMRS demodulation reference signal
  • the terminal (or a communication device included in the terminal) may be configured to communicate with at least one of a mobile terminal, a network, and an autonomous vehicle other than the vehicle including the terminal.
  • a base station comprises: at least one radio frequency (RF) module; At least one processor; And at least one memory operatively connected to the at least one processor, and storing instructions that, when executed, cause the at least one processor to perform the following operation.
  • the communication device included in the base station may be configured to include the at least one processor and the at least one memory, and the communication device includes the at least one RF module or the at least one RF. It may be configured to be connected to the at least one RF module without a module.
  • At least one processor included in the base station controls the at least one RF module to (i) establish a first physical downlink shared channel (PDSCH). And (ii) send downlink control information (DCI) associated with one valid reference signal (RS) set and one invalid RS set to the first terminal.
  • the DCI includes (i) information on one or more first demodulation reference signal (DMRS) port numbers associated with the first PDSCH and (ii) one or more second associated with a second PDSCH for a second terminal. It may include information on the DMRS port number.
  • At least one processor included in the base station controls the at least one RF module to transmit the first PDSCH to the first terminal, It may be configured to transmit the second PDSCH to a second terminal.
  • a terminal is a personal digital assistant (PDA), a cellular phone, a personal communication service (PCS) phone, a global system for mobile (GSM) phone, a wideband CDMA (WCDMA) phone, and an MBS.
  • PDA personal digital assistant
  • PCS personal communication service
  • GSM global system for mobile
  • WCDMA wideband CDMA
  • MBS Multi Mode-Multi Band
  • a smart phone is a terminal that combines the advantages of a mobile communication terminal and a personal portable terminal, and may mean a terminal incorporating data communication functions such as schedule management, fax transmission and reception, which are functions of a personal mobile terminal, in a mobile communication terminal.
  • a multimode multiband terminal has a built-in multi-modem chip that can operate in both portable Internet systems and other mobile communication systems (e.g., Code Division Multiple Access (CDMA) 2000 systems, wideband CDMA (WCDMA) systems, etc.). Speak the terminal.
  • CDMA Code Division Multiple Access
  • WCDMA wideband CDMA
  • Embodiments of the invention may be implemented through various means.
  • embodiments of the present invention may be implemented by hardware, firmware, software, or a combination thereof.
  • a method according to embodiments of the present invention may include one or more application specific integrated circuits (ASICs), digital signal processors (DSPs), digital signal processing devices (DSPDs), programmable logic devices (PLDs), Field programmable gate arrays (FPGAs), processors, controllers, microcontrollers, microprocessors and the like can be implemented.
  • ASICs application specific integrated circuits
  • DSPs digital signal processors
  • DSPDs digital signal processing devices
  • PLDs programmable logic devices
  • FPGAs Field programmable gate arrays
  • processors controllers, microcontrollers, microprocessors and the like can be implemented.
  • the method according to the embodiments of the present invention may be implemented in the form of a module, procedure, or function that performs the functions or operations described above.
  • software code may be stored in the memory units 1050 and 1150 and driven by the processors 1040 and 1140.
  • the memory unit may be located inside or outside the processor, and may exchange data with the processor by various known means.
  • the above-described communication device includes a base station, a network node, a transmission terminal, a reception terminal, a wireless device, a wireless communication device, a vehicle, a vehicle equipped with an autonomous driving function, a drone (Unmanned Aerial Vehicle, UAV), an AI (Artificial Intelligence) module, It may be a robot, an Augmented Reality (AR) device, a Virtual Reality (VR) device, or other device.
  • UAV Unmanned Aerial Vehicle
  • AI Artificial Intelligence
  • It may be a robot, an Augmented Reality (AR) device, a Virtual Reality (VR) device, or other device.
  • the terminal may be a mobile phone, a smart phone, a laptop computer, a digital broadcasting terminal, a personal digital assistant (PDA), a portable multimedia player (PMP), navigation, a slate PC, a tablet. It may include a tablet PC, an ultrabook, a wearable device (eg, a smartwatch, a glass glass, a head mounted display), and the like.
  • a drone may be a vehicle in which humans fly by radio control signals.
  • the HMD may be a display device worn on the head.
  • the HMD can be used to implement VR or AR.
  • Embodiments of the present invention can be applied to various wireless access systems.
  • various radio access systems include 3rd Generation Partnership Project (3GPP) or 3GPP2 systems.
  • 3GPP 3rd Generation Partnership Project
  • Embodiments of the present invention can be applied not only to the various radio access systems, but also to all technical fields to which the various radio access systems are applied.
  • the proposed method can be applied to mmWave communication system using ultra high frequency band.
  • embodiments of the present invention may be applied to various applications such as a free running vehicle and a drone.

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  • Engineering & Computer Science (AREA)
  • Signal Processing (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Mobile Radio Communication Systems (AREA)

Abstract

La présente invention concerne un procédé de transmission ou de réception d'un signal de liaison descendante entre un terminal et une station de base dans un système de communication sans fil, et un appareil prenant en charge ledit procédé. Selon un mode de réalisation applicable à la présente invention, lorsque le terminal reçoit des informations de commande de liaison descendante (DCI) associées à un ensemble de signal de référence valide (RS) et un ensemble de RS invalide, le terminal peut recevoir un canal partagé de liaison descendante physique (PDSCH) devant être planifié par les DCI, par l'intermédiaire d'une estimation de canal d'interférence basée sur les DCI.
PCT/KR2019/009611 2018-08-17 2019-08-01 Procédé de transmission ou de réception de signal de liaison descendante entre un terminal et une station de base dans un système de communication sans fil, et appareil le prenant en charge WO2020036350A1 (fr)

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