WO2019225901A1 - Method for operating terminal and base station in wireless communication system supporting unlicensed spectrum, and apparatus supporting same - Google Patents

Abstract

Disclosed according to the present invention are a method for operating a terminal and a base station in a wireless communication system supporting an unlicensed spectrum, and an apparatus supporting same. Specifically, an embodiment according to the present invention provides a method for transmitting/receiving a synchronization signal block (or synchronization signal/physical broadcast channel (SS/PBCH) block) over an unlicensed spectrum by a base station and a terminal.

Description

Operation method of terminal and base station in wireless communication system supporting unlicensed band

The following description relates to a wireless communication system, and relates to a method of operating a terminal and a base station and a device supporting the same in a wireless communication system supporting an unlicensed band.

Wireless access systems are widely deployed to provide various kinds of communication services such as voice and data. In general, 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.). Examples of 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.

In addition, as more communication devices require larger communication capacities, there is a need for improved mobile broadband communication as compared to conventional radio access technology (RAT). Massive Machine Type Communications (MTC), which connects multiple devices and objects to provide various services anytime, anywhere, is also being considered in next-generation communications. In addition, a communication system design considering a service / UE that is sensitive to reliability and latency is being considered.

The introduction of the next generation of RATs considering such improved mobile broadband communication, massive MTC, and Ultra-Reliable and Low Latency Communication (URLLC) is being discussed.

In addition, the present invention may be related to the following technical configurations.

Artificial Intelligence (AI)

Artificial intelligence refers to the field of researching artificial intelligence or the methodology that can produce it, and machine learning refers to the field of researching methodologies that 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.

Artificial Neural Network (ANN) is a model used in machine learning, and may refer to an overall problem-solving model composed of artificial neurons (nodes) formed by a combination of synapses. 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 includes 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. In addition, the hyperparameter means a parameter to be set before learning in the machine learning algorithm, and includes a learning rate, the number of iterations, a 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 optimal model parameters in the learning process of artificial neural networks.

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 should infer when the training data is input to the artificial neural network. Can mean. 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. In the following, machine learning is used to mean deep learning.

<Robot>

A robot can mean a machine that automatically handles or operates a given task by its own ability. In particular, 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. In addition, 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.

Self-Driving, Autonomous-Driving

Autonomous driving means a technology that drives by itself, and autonomous vehicle means a vehicle that runs without a user's manipulation or with minimal manipulation of a user.

For example, for autonomous driving, 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 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.

In this case, the autonomous vehicle may be viewed as a robot having an autonomous driving function.

EXtended Reality (XR)

Extended reality collectively refers to Virtual Reality (VR), Augmented Reality (AR), and Mixed Reality (MR). VR technology provides real world objects or backgrounds only in CG images, AR technology provides virtual CG images on real objects images, and 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. However, in AR technology, the virtual object is used as a complementary form to the real object, whereas in the MR technology, the virtual object and the real object are used in the same nature.

XR technology can be applied to HMD (Head-Mount Display), HUD (Head-Up Display), mobile phone, tablet PC, laptop, desktop, TV, digital signage, etc. It can be called.

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, or the like.

Referring to FIG. 1, 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. For example, the communicator 110 may transmit / receive sensor information, a user input, a learning model, a control signal, and the like with external devices.

In this case, 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 쪠), Radio Frequency Identification (RFID), Infrared Data Association (IrDA), ZigBee, Near Field Communication (NFC), and the like.

The input unit 120 may acquire various types of data.

In this case, 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. Here, the 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 running processor 130 may train a model composed of artificial neural networks using the training data. Here, 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.

In this case, the running processor 130 may perform AI processing together with the running processor 240 of the AI server 200.

In this case, the running processor 130 may include a memory integrated with or implemented in the AI device 100. Alternatively, the running processor 130 may be implemented using a 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.

In this case, 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, etc.

The output unit 150 may generate an output related to sight, hearing, or touch.

In this case, 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. For example, 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 the determined operation.

To this end, the processor 180 may request, search, 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.

In this case, when the external device needs to be linked to perform the determined operation, 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.

In this case, 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.

In this case, 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 two or more of the components included in the AI device 100 in combination with each other to drive the application program.

2 illustrates an AI server 200 according to an embodiment of the present invention.

Referring to FIG. 2, 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. Here, the AI server 200 may be composed of a plurality of servers to perform distributed processing, or may be defined as a 5G network. In this case, 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 model being trained or learned (or an artificial neural network 231a) through the running processor 240.

The running 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.

3 shows an AI system 1 according to an embodiment of the present invention.

Referring to FIG. 3, 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. Here, 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 or exists within a cloud computing infrastructure. Here, the cloud network 10 may be configured using a 3G network, 4G or Long Term Evolution (LTE) network or a 5G network.

That is, the devices 100a to 100e and 200 constituting the AI system 1 may be connected to each other through the cloud network 10. In particular, although the devices 100a to 100e and 200 may communicate with each other through the base station, they may also 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.

In this case, the AI server 200 may train the artificial neural network according to the machine learning algorithm on behalf 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.

At this time, the AI server 200 receives the input data from the AI device (100a to 100e), infers the result value with respect to the input data received using the training 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).

Alternatively, 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.

Hereinafter, various embodiments of the AI devices 100a to 100e to which the above-described technology is applied will be described. Here, 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.

<AI + robot>

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 kinds 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.

Here, 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-described operations by using a learning model composed of at least one artificial neural network. For example, the robot 100a may recognize a surrounding environment and an object using a learning model, and determine an operation using the recognized surrounding environment information or object information. Here, 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.

In this case, 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 moving route and a traveling 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 traveling plan. Accordingly, the robot 100a may be driven.

The map data may include object identification information about various objects arranged in a space in which the robot 100a moves. For example, 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.

In addition, the robot 100a may control the driving unit based on the control / interaction of the user, thereby performing an operation or driving. In this case, the robot 100a may acquire the intention information of the interaction according to the user's motion or speech, and determine a response based on the acquired intention information to perform the operation.

<AI + autonomous driving>

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. The autonomous driving control module may be included inside as a configuration of the autonomous driving vehicle 100b, but may be connected to the outside of the autonomous driving vehicle 100b as a separate hardware.

The autonomous vehicle 100b obtains 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.

Here, 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.

In particular, 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. For example, 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. Here, 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.

In this case, 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. For example, 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.

In addition, the autonomous vehicle 100b may perform an operation or drive by controlling the driving unit based on the user's control / interaction. In this case, 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 + XR>

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.

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. For example, 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. Here, the learning model may be learned directly from the XR device 100c or learned from an external device such as the AI server 200.

In this case, the XR device 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.

<AI + Robot + Autonomous Driving>

The robot 100a may be applied to an AI technology and an autonomous driving 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 to which the AI technology and the autonomous driving technology are applied may mean a robot itself having an autonomous driving function or a robot 100a interacting with the autonomous vehicle 100b.

The robot 100a having an autonomous driving function may collectively move devices by moving according to a given copper wire or determine the copper wire by itself without the user's control.

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 moving route or a driving plan. For example, 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. ) Can be performed in conjunction with the user aboard.

At this time, 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 and displays the surrounding environment information or 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.

Alternatively, 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. . For example, when it is determined that the driver is in a drowsy state, the robot 100a may activate the autonomous driving function of the autonomous vehicle 100b or assist control of the driver of the autonomous vehicle 100b. Here, 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.

Alternatively, 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. For example, 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.

<AI + robot + XR>

The robot 100a may be implemented with 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. In this case, the robot 100a may be distinguished from the XR apparatus 100c and interlocked with each other.

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.

For example, 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.

<AI + Autonomous driving + XR>

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 provided with means for providing an XR image, or an autonomous vehicle that is the object of control / interaction in the XR image. In particular, 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 acquired sensor information. For example, the autonomous vehicle 100b may provide an XR object corresponding to a real object or an object on the screen by providing an HR to output an XR image.

In this case, 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. On the other hand, when the XR object is output on the display provided inside the autonomous vehicle 100b, at least a part of the XR object may be output to overlap the object in the screen. For example, 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.

When 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. In addition, 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 operating a terminal and a base station and devices supporting the same in a wireless communication system supporting an unlicensed band.

Technical objects to be achieved in the present invention are not limited to the above-mentioned matters, and other technical problems not mentioned above are provided to those skilled in the art from the embodiments of the present invention to be described below. May be considered.

The present invention provides a method for operating a terminal and a base station and a device supporting the same in a wireless communication system supporting an unlicensed band.

According to an aspect of the present invention, in a method of operating a terminal in a wireless communication system supporting an unlicensed band, a sequence of sync signal block (SSB) indexes transmitted within a sync signal block (SSB) transmission interval is changed according to a predetermined period. Obtaining information about the SSB index order transmitted during a first SSB transmission interval within a specific period; And receiving the SSB corresponding to at least one SSB index during the first SSB transmission interval on the unlicensed band, based on the information.

Wherein acquiring the information comprises: (i) acquiring period information for the predetermined period; And (ii) obtaining index order information on the SSB index order transmitted during the SSB transmission interval for each period, based on the period information.

In this case, acquiring the period information may include one of the following.

Obtaining the period information from preset information, or

Receiving the period information through higher layer signaling

Alternatively, obtaining the index order information may include one of the following.

Obtaining the index order information on the SSB index order transmitted during the SSB transmission interval for each period from preset information;

Receiving the index order information on the SSB index order transmitted during the SSB transmission interval for each period through higher layer signaling

Obtaining the index order information on the SSB index order transmitted during the SSB transmission interval for each period based on the identification information of the cell connected to the terminal, or

Obtaining the index order information on the SSB index order transmitted during the SSB transmission period for each period, based on the identification information of the slot associated with the SSB transmission period;

In the present invention, the SSB received during the first SSB transmission interval based on the information may be different from the SSB for initial access.

In this case, the SSB received during the first SSB transmission interval based on the information may be transmitted on a resource different from the SSB for the initial access.

Alternatively, the SSB received during the first SSB transmission interval based on the information may correspond to an SSB based on numerology including a 15 kHz subcarrier spacing.

In the present invention, the first SSB transmission interval may include a first time interval for transmission of one or more SSBs based on the SSB index order transmitted during the first SSB transmission interval; And a second time interval for transmitting the additional SSB corresponding to the SSB index not transmitted during the first time interval.

In this case, the first time interval may be preceded in the time domain than the second time interval.

In this case, performing the reception of the SSB corresponding to the at least one SSB index during the first SSB transmission period on the unlicensed band includes: (i) the transmission during the first SSB transmission period during the first time period; Perform monitoring for one or more first SSBs based on the SSB index order; And (ii) additional monitoring for additional SSBs corresponding to SSB indexes not received during the first time period during the second time period when there are SSB indexes not received during the first time period among all SSB indexes. It may include performing.

In this case, based on the one or more first SSB indexes associated with the SSB received during the first time interval, the terminal is a time interval for transmission of the additional SSB corresponding to the first SSB index in the second time interval. You can do the following:

(i) monitoring a physical downlink control channel (PDSCH) signal or a physical downlink shared channel (PDSCH) signal on the unlicensed band, or

(ii) performing transmission of a physical uplink control channel (PUCCH) signal or a physical uplink shared channel (PUSCH) signal on the unlicensed band based on a channel access procedure (CAP) for the unlicensed band

In another aspect of the present invention, in a method of operating a base station in a wireless communication system supporting an unlicensed band, the order of the synchronization signal block (SSB) index transmitted in the synchronization signal block (SSB) transmission interval is changed based on a predetermined period. Obtaining information about the SSB index order transmitted during a first SSB transmission interval within a specific period; And performing transmission of an SSB corresponding to one or more SSB indexes using a channel access procedure (CAP) during the first SSB transmission interval on the unlicensed band, based on the information. We propose a method of operation.

Here, the first SSB transmission interval may include a first time interval for transmitting one or more SSBs based on the SSB index order transmitted during the first SSB transmission interval; And a second time interval for transmitting the additional SSB corresponding to the SSB index not transmitted during the first time interval.

In this case, the BS performing transmission of the SSB corresponding to the one or more SSB indexes using the CAP during the first SSB transmission period on the unlicensed band may include: (i) during the first time period, Performing transmission of an SSB corresponding to at least one first SSB index on the unlicensed band based on the SSB index order transmitted during one SSB transmission interval and CAP for each SSB; And (ii) when there is a second SSB index that has not been transmitted during the first time interval among all SSB indexes, corresponding to the second SSB index through the unlicensed band using the CAP during the second time interval. It may include performing the transmission of the additional SSB.

In still another aspect of the present invention, there is provided a terminal operating in a wireless communication system supporting an unlicensed band, 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: a period of time; Acquiring information about the SSB index order transmitted during the first SSB transmission period within a specific period based on the change of the synchronization signal block (SSB) index order transmitted within the synchronization signal block (SSB) transmission period according to the change; And based on the information, controlling the at least one RF module to perform reception of an SSB corresponding to at least one SSB index during the first SSB transmission period on the unlicensed band.

In this case, 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.

Another aspect of the present invention provides a base station operating in a wireless communication system supporting an unlicensed band, 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: a period of time; Acquiring information about the SSB index order transmitted during the first SSB transmission period within a specific period based on the change of the synchronization signal block (SSB) index order transmitted within the synchronization signal block (SSB) transmission period according to the change; And controlling transmission of the at least one RF module to perform transmission of an SSB corresponding to at least one SSB index using a channel access procedure (CAP) during the first SSB transmission interval on the unlicensed band based on the information. A base station is proposed.

The above-described aspects of the present invention are merely some of the preferred embodiments of the present invention, and various embodiments reflecting the technical features of the present invention will be described in detail by those skilled in the art. Based on the description, it can be derived and understood.

According to embodiments of the present invention has the following effects.

Due to the nature of the unlicensed band, a base station may not always transmit a sync signal block (or sync signal physical broadcast channel (SS / PBCH) block) to a terminal at a specific time. This is because if the base station does not occupy the unlicensed band at the specific time point, the base station cannot transmit the sync signal block.

In addition, according to this characteristic, when the base station always transmits a synchronization signal based on a fixed synchronization signal block index order, the transmission probability of the synchronization signal block corresponding to the first synchronization signal block index is generally equal to the first synchronization. It may be lower than the transmission probability of the sync signal block corresponding to the second sync signal block index that is later in the time domain than the signal block index.

On the other hand, according to the present invention, in order to change the synchronization signal block index order transmitted at regular intervals in consideration of the characteristics of the unlicensed band, the transmission probability of the synchronization signal for each synchronization signal block index can be kept constant.

Effects obtained in the embodiments of the present invention are not limited to the above-mentioned effects, and other effects not mentioned above are commonly known in the art to which the present invention pertains from the description of the embodiments of the present invention. Can be clearly derived and understood by those who have In other words, unintended effects of practicing the present invention may also be derived by those skilled in the art from the embodiments of the present invention.

BRIEF DESCRIPTION OF THE DRAWINGS The accompanying drawings are provided to facilitate understanding of the present invention, and provide embodiments of the present invention together with the detailed description. However, the technical features of the present invention are not limited to the specific drawings, and the features disclosed in the drawings may be combined with each other to constitute a new embodiment. Reference numerals in each drawing refer to structural elements.

1 illustrates an AI device according to an embodiment of the present invention.

2 illustrates an AI server according to an embodiment of the present invention.

3 illustrates an AI system according to an embodiment of the present invention.

4 is a diagram illustrating a physical channel and a signal transmission method using the same.

5 and 6 are diagrams illustrating a radio frame structure based on an LTE system to which embodiments of the present invention are applicable.

7 illustrates a slot structure based on an LTE system to which embodiments of the present invention are applicable.

8 illustrates a structure of a downlink subframe based on an LTE system to which embodiments of the present invention are applicable.

9 illustrates a structure of an uplink subframe based on an LTE system to which embodiments of the present invention are applicable.

10 is a diagram illustrating a structure of a radio frame based on an NR system to which embodiments of the present invention are applicable.

11 illustrates a slot structure based on an NR system to which embodiments of the present invention are applicable.

12 is a diagram illustrating a self-contained slot structure applicable to the present invention.

13 is a diagram illustrating one REG structure based on an NR system to which embodiments of the present invention are applicable.

14 and 15 illustrate exemplary connection schemes of a TXRU and an antenna element.

16 is a diagram schematically illustrating a hybrid beamforming structure from a TXRU and a physical antenna perspective according to an example of the present invention.

FIG. 17 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.

18 is a diagram briefly showing an SS / PBCH block applicable to the present invention.

19 is a diagram briefly illustrating a configuration in which an SS / PBCH block applicable to the present invention is transmitted.

20 shows an example of a wireless communication system supporting an unlicensed band applicable to the present invention.

21 is a view for explaining a CAP for unlicensed band transmission applicable to the present invention.

FIG. 22 is a diagram illustrating a partial TTI or partial subframe / slot applicable to the present invention. FIG.

FIG. 23 is a diagram schematically illustrating a beam sweeping operation applicable to the present invention, and FIG. 24 is a diagram illustrating an example in which each beam is transmitted according to beam sweeping.

25 is a diagram schematically showing a first signal transmission method based on beam sweeping applicable to the present invention.

FIG. 26 is a diagram schematically illustrating a second signal transmission method based on beam sweeping applicable to the present invention.

27 is a diagram schematically showing a third signal transmission method based on beam sweeping applicable to the present invention.

28 is a diagram briefly showing a fourth signal transmission method based on beam sweeping applicable to the present invention.

29 is a diagram briefly showing a fifth signal transmission method based on beam sweeping applicable to the present invention.

30 is a diagram briefly illustrating a connection relationship between an SS block and an SS set applicable to the present invention.

FIG. 31 is a diagram briefly showing an SSB transmission method of a base station through an unlicensed band applicable to the present invention.

32 is a diagram illustrating the operation of a terminal and a base station applicable to the present invention, FIG. 33 is a flowchart illustrating the operation of a terminal applicable to the present invention, and FIG. 34 is a flowchart illustrating the operation of a base station applicable to the present invention.

35 is a diagram illustrating a configuration of a terminal and a base station in which the proposed embodiments can be implemented.

36 is a block diagram of a communication device in which proposed embodiments can be implemented.

The following embodiments combine the components and features of the present invention in a predetermined form. 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. In addition, 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.

In the description of the drawings, procedures or steps which may obscure the gist of the present invention are not described, and procedures or steps that can be understood by those skilled in the art are not described.

Throughout the specification, when a part is said to "comprising" (or including) a component, this means that it may further include other components, except to exclude other components unless specifically stated otherwise. do. In addition, the terms "... unit", "... group", "module", etc. described in the specification mean a unit for processing at least one function or operation, which is hardware or software or a combination of hardware and software. It can be implemented as. Also, "a or an", "one", "the", and the like are used differently in the context of describing the present invention (particularly in the context of the following claims). Unless otherwise indicated or clearly contradicted by context, it may be used in the sense including both the singular and the plural.

In the present specification, embodiments of the present invention have been described based on data transmission / reception relations between a base station and a mobile station. Here, the base station is meant as a terminal node of a network that directly communicates with a mobile station. The specific operation described as performed by the base station in this document may be performed by an upper node of the base station in some cases.

That is, 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. In this case, the 'base station' is 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.

Further, in embodiments of the present invention, 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).

Also, the transmitting end refers to a fixed and / or mobile node that provides a data service or a voice service, and 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 wireless access systems IEEE 802.xx system, 3rd Generation Partnership Project (3GPP) system, 3GPP LTE system, 3GPP 5G NR system and 3GPP2 system In particular, embodiments of the present invention include 3GPP TS 36.211, 3GPP TS 36.212, 3GPP TS 36.213, 3GPP TS 36.321, 3GPP TS 36.331, 3GPP TS 37.213, 3GPP TS 38.211, 3GPP TS 38.212, 3GPP TS 38.213, 3GPP TS 38.321 and 3GPP It may be supported by 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. In addition, all terms disclosed in the present document can be described by the above standard document.

Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings. The detailed description, which will be given below with reference to the accompanying drawings, is intended to explain exemplary embodiments of the present invention and is not intended to represent the only embodiments in which the present invention may be practiced.

In addition, specific terms used in the embodiments of the present invention are provided to help the understanding of the present invention, and the use of the specific terms may be changed into other forms without departing from the technical spirit of the present invention. .

Hereinafter, a 3GPP NR system as well as a 3GPP LTE / LTE-A system will be described as an example of a wireless access system in which embodiments of the present invention can be used.

The following techniques include code division multiple access (CDMA), frequency division multiple access (FDMA), time division multiple access (TDMA), orthogonal frequency division multiple access (OFDMA), single carrier frequency division multiple access (SC-FDMA), and the like. It can be applied to various radio access systems.

CDMA may be implemented with a radio technology such as Universal Terrestrial Radio Access (UTRA) or CDMA2000. TDMA may be implemented with wireless technologies such as Global System for Mobile communications (GSM) / General Packet Radio Service (GPRS) / Enhanced Data Rates for GSM Evolution (EDGE). OFDMA may be implemented in a wireless technology such as IEEE 802.11 (Wi-Fi), IEEE 802.16 (WiMAX), IEEE 802-20, Evolved UTRA (E-UTRA).

UTRA is part of the Universal Mobile Telecommunications System (UMTS). 3GPP Long Term Evolution (LTE) is part of an Evolved UMTS (E-UMTS) using E-UTRA, and employs OFDMA in downlink and SC-FDMA in uplink. The LTE-A (Advanced) system is an improved system of the 3GPP LTE system.

In order to clarify the description of the technical features of the present invention, embodiments of the present invention are described not only for the 3GPP LTE / LTE-A system but also for the 3GPP NR system, but may be applied to the IEEE 802.16e / m system and the like.

1.3GPP  System general

1.1 Physical Channels and General Signal Transmission

In a wireless access system, 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.

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.

When the power is turned off while the power is turned off, or a new terminal enters a cell, an initial cell search operation such as synchronization with a base station is performed (S11). To this end, the UE 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.

Thereafter, the terminal may receive a physical broadcast channel (PBCH) signal from the base station to obtain broadcast information in a cell.

On the other hand, the terminal may receive a downlink reference signal (DL RS) in the initial cell search step to confirm the downlink channel state.

After 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 to provide more detailed system information. It can be obtained (S12).

Thereafter, the terminal may perform a random access procedure to complete the access to the base station (S13 to S16). To this end, the UE transmits a preamble through a physical random access channel (PRACH) (S13), and a RAR for the preamble through a physical downlink control channel and a corresponding physical downlink shared channel (S13). Random Access Response) may be received (S14). The UE transmits a PUSCH (Physical Uplink Shared Channel) using scheduling information in the RAR (S15), and contention resolution procedure such as receiving a physical downlink control channel signal and a corresponding physical downlink shared channel signal. (S16).

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).

The control information transmitted from the terminal to the base station is collectively referred to as uplink control information (UCI). UCI includes Hybrid Automatic Repeat and reQuest Acknowledgement / Negative-ACK (HARQ-ACK / NACK), Scheduling Request (SR), Channel Quality Indication (CQI), Precoding Matrix Indication (PMI), and Rank Indication (RI) information. .

In general, UCI is periodically transmitted through a PUCCH, but may be transmitted through a PUSCH when control information and data should be transmitted at the same time. In addition, the UE may transmit the UCI aperiodically through the PUSCH according to the request / instruction of the network.

1.2. Radio Frame Structure

5 and 6 are diagrams illustrating a radio frame structure based on an LTE system to which embodiments of the present invention are applicable.

The LTE system supports frame type 1 for frequency division duplex (FDD), frame type 2 for time division duplex (TDD), and frame type 3 for unlicensed cell (UCell). In the LTE system, up to 31 secondary cells (SCells) may be aggregated in addition to a primary cell (PCell). Unless otherwise stated, the operations described below may be independently applied to each cell.

In multi-cell merging, different frame structures may be used for different cells. In addition, time resources (eg, subframes, slots, and subslots) in the frame structure may be collectively referred to as a time unit (TU).

5 (a) shows a frame structure type 1. The type 1 frame structure can be applied to both full duplex Frequency Division Duplex (FDD) systems and half duplex FDD systems.

The downlink radio frame is defined as ten 1ms subframes (SFs). The subframe includes 14 or 12 symbols according to cyclic prefix (CP). When a normal CP is used, the subframe includes 14 symbols. If extended CP is used, the subframe includes 12 symbols.

The symbol may mean an OFDM (A) symbol or an SC-FDM (A) symbol according to a multiple access scheme. For example, the symbol may mean an OFDM (A) symbol in downlink and an SC-FDM (A) symbol in uplink. OFDM (A) symbols are referred to as Cyclic Prefix-OFDM (A) symbols, and SC-FDM (A) symbols are DFT-s-OFDM (A) (Discrete Fourier Transform-spread-OFDM) symbols. (A)) may be referred to as a symbol.

One subframe may be defined as one or more slots according to SCS (Subcarrier Spacing) as follows.

For SCS = 7.5 kHz or 15 kHz, subframe #i is defined as two 0.5ms slots # 2i and # 2i + 1 (i = 0-9).

When SCS = 1.25 kHz, subframe #i is defined as one 1ms slot # 2i.

When SCS = 15 kHz, subframe #i may be defined as six subslots as illustrated in Table A1.

Table 1 illustrates the subslot configuration in one subframe (usually CP).

5 (b) shows a frame structure type 2. Type 2 frame structure is applied to the TDD system. The type 2 frame structure consists of two half frames. The half frame includes 4 (or 5) general subframes and 1 (or 0) special subframes. The general subframe is used for uplink or downlink according to the UL-Downlink configuration. The subframe consists of two slots.

Table 2 illustrates a subframe configuration in a radio frame according to the UL-DL configuration.

Here, D represents a DL subframe, U represents a UL subframe, and S represents a special subframe. The special subframe includes a downlink pilot time slot (DwPTS), a guard period (GP), and an uplink pilot time slot (UpPTS). DwPTS is used for initial cell search, synchronization or channel estimation at the terminal. UpPTS is used for channel estimation at the base station and synchronization of uplink transmission of the terminal. The guard period is a period for removing interference generated in the uplink due to the multipath delay of the downlink signal between the uplink and the downlink.

Table 3 illustrates the configuration of the special subframe.

Here, X is set by higher layer signaling (eg, RRC (Radio Resource Control) signaling, etc.) or is given as 0.

6 illustrates a frame structure type 3. FIG.

Frame structure type 3 may be applied to UCell operation. Although not limited to this, the frame structure type 3 may be applied only to the operation of a licensed assisted access (LAA) SCell having a normal CP. The frame has a length of 10 ms and is defined by ten 1 ms subframes. Subframe #i is defined as two consecutive slots # 2i and # 2i + 1. Each subframe in the frame may be used for downlink or uplink transmission or may be empty. The downlink transmission occupies one or more contiguous subframes (occupy) and starts at any point in the subframe and ends at the subframe boundary or DwPTS in Table 3. Uplink transmission occupies one or more consecutive subframes.

7 illustrates a slot structure based on an LTE system to which embodiments of the present invention are applicable.

Referring to FIG. 7, one slot includes a plurality of OFDM symbols in a time domain and includes a plurality of resource blocks (RBs) in a frequency domain. The symbol may mean a symbol section. The slot structure may be represented by a resource grid composed of N ^{DL / UL} _RB × N ^RB _sc subcarriers and N ^{DL / UL} _symb symbols. Here, N ^DL _RB represents the number of RBs in the downlink slot, and N ^UL _RB represents the number of _RBs in the UL slot. N ^DL _RB and N ^UL _RB depend on DL bandwidth and UL bandwidth, respectively. N ^DL _symb represents the number of symbols in the DL slot, and N ^UL _symb represents the number of symbols in the UL slot. N ^RB _sc represents the number of subcarriers constituting the RB. The number of symbols in the slot can be changed in various ways according to the SCS, CP length (see Table 1). 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.

RB is defined as N ^{DL / UL} _symb (eg, 7) consecutive symbols in the time domain, and N ^RB _sc (eg, 12) consecutive subcarriers in the frequency domain. Here, the RB may mean a physical resource block (PRB) or a virtual resource block (VRB), and the PRB and the VRB may be mapped one-to-one. Two RBs, one located in each of two slots of a subframe, may be referred to as an RB pair. Two RBs constituting the RB pair may have the same RB number (or also referred to as an RB index). A resource composed of one symbol and one subcarrier is called a resource element (RE) or tone. Each RE in a resource grid may be uniquely defined by an index pair (k, l) in a slot. k is an index given from 0 to N ^{DL / UL} _RB × N ^RB _sc −1 in the frequency domain, and l is an index given from 0 to N ^{DL / UL} _symb −1 in the time domain.

8 illustrates a structure of a downlink subframe based on an LTE system to which embodiments of the present invention are applicable.

Referring to FIG. 8, up to three (or four) OFDM (A) symbols located in front of the first slot in a subframe correspond to a control region to which a downlink control channel is allocated. The remaining OFDM (A) symbol corresponds to a data region to which a PDSCH is allocated, and the basic resource unit of the data region is RB. The downlink control channel includes a physical control format indicator channel (PCFICH), a physical downlink control channel (PDCCH), a physical hybrid-ARQ indicator channel (PHICH), and the like.

The PCFICH is transmitted in the first OFDM symbol of a subframe and carries information about the number of OFDM symbols (ie, the size of the control region) used for transmission of control channels within the subframe. The PHICH is a response channel for uplink transmission and carries a HARQ (Hybrid Automatic Repeat Request) acknowledgment (ACK) / Negative-Acknowledgement (NACK) signal. Control information transmitted through the PDCCH is referred to as downlink control information (DCI). DCI includes uplink resource allocation information, downlink resource allocation information, or an uplink transmission (Tx) power control command for a certain terminal group.

9 illustrates a structure of an uplink subframe based on an LTE system to which embodiments of the present invention are applicable.

Referring to FIG. 9, one subframe 600 includes two 0.5 ms slots 601. Each slot consists of a plurality of symbols 602 and one symbol corresponds to one SC-FDMA symbol. The RB 603 is a resource allocation unit corresponding to 12 subcarriers in the frequency domain and one slot in the time domain.

The structure of an uplink subframe is largely divided into a data region 604 and a control region 605. The data area means a communication resource used in transmitting data such as voice and packet transmitted from each terminal, and includes a PUSCH (Physical Uplink Shared Channel). The control region means a communication resource used to transmit an uplink control signal, for example, a downlink channel quality report from each terminal, a received ACK / NACK for an uplink signal, an uplink scheduling request, and a PUCCH (Physical Uplink). Control Channel).

The SRS (Sounding Reference Signal) is transmitted through the SC-FDMA symbol located last on the time axis in one subframe.

10 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. 10. 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 the subcarrier spacing (SCS). 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. Here, the symbol may include an OFDM symbol (or a CP-OFDM symbol) and an SC-FDMA symbol (or a DFT-s-OFDM symbol).

Table 4 shows the number of symbols for each slot according to SCS, the number of slots for each frame and the number of slots for each subframe when a general CP is used. Table 5 shows the number of slots for each SCS, if an extended CSP is used. It indicates the number of symbols, the number of slots per frame, and the number of slots per subframe.

In the table, N ^slot _symb represents the number of symbols in the slot, N ^{frame, μ} _slot represents the number of _slots in the frame, and N ^{subframe, μ} _slot represents the number of slots in the ^subframe .

In the NR system to which the present invention is applicable, OFDM (A) numerology (eg, SCS, CP length, etc.) may be set differently between a plurality of cells merged into one UE. Accordingly, the (absolute time) section of a time resource (eg, SF, slot, or TTI) (commonly referred to as a time unit (TU) for convenience) composed of the same number of symbols may be set differently between merged cells.

11 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 (RB) is defined as a plurality of consecutive subcarriers (eg, 12) in the frequency domain.

The bandwidth part (BWP) 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.

FIG. 12 is a diagram illustrating a self-contained slot structure based on an NR system to which embodiments of the present invention are applicable.

In FIG. 12, the hatched area (eg, symbol index = 0) represents a downlink control area, and the black area (eg, symbol index = 13) represents an uplink control area. The other area (eg, symbol index = 1 to 12) may be used for downlink data transmission or may be used for uplink data transmission.

According to this structure, 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. As a result, 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.

In this independent slot structure, 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. To this end, some OFDM symbols at the time of switching from DL to UL in the independent slot structure may be set to a guard period (GP).

In the above detailed description, the case in which the independent slot structure includes both the DL control region and the UL control region is described, but the control regions may be selectively included in the independent slot structure. In other words, 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. 12 but also the case of including only the DL control region or the UL control region.

In addition, the order of the regions constituting one slot may vary according to embodiments. For example, one slot may be configured in the order of DL control region / DL data region / UL control region / UL data region, or may be configured in the order of UL control region / UL data region / DL control region / DL data region.

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 (DCI), for example, DL data scheduling information, UL data scheduling information, and the like may be transmitted in the PDCCH. In PUCCH, uplink control information (UCI), for example, positive acknowledgment / negative acknowledgment (ACK / NACK) information, channel state information (CSI) information, and scheduling request (SR) for DL data may be transmitted.

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 a maximum of 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.

The PDCCH carries downlink control information (DCI) and a QPSK modulation method is applied. 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). One REG is defined by one OFDM symbol and one (P) RB.

13 is a diagram illustrating one REG structure based on an NR system to which embodiments of the present invention are applicable.

In FIG. 13, D represents a resource element (RE) to which DCI is mapped, and R represents an RE to which DMRS is mapped. DMRS is mapped to the 1st, 5th, and 9th REs in the frequency domain direction in one symbol.

The PDCCH is transmitted through a control resource set (CORESET). CORESET is defined as a set of REGs with a given pneumonology (eg, SCS, CP length, etc.). A plurality of OCRESET 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. In detail, the number of RBs and the number of symbols (maximum 3) 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. When the PUSCH is transmitted based on the DFT-s-OFDM waveform, the terminal transmits the PUSCH by applying transform precoding. For example, 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 6 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 PUCCH having PUCCH format 0 in the PUCCH resource for SR configuration only when transmitting a positive SR.

PUCCH format 1 carries UCI of up to 2 bits in size, and modulation symbols are spread by an orthogonal cover code (OCC) that is set differently depending on whether frequency hopping or not. The DMRS is transmitted in a symbol in which a modulation symbol is not transmitted (ie, 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 (Pseudo Noise) sequence is used for 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. In other words, the PUCCH resource of PUCCH format 3 does not include an orthogonal cover code. The modulation symbol is transmitted by time division multiplexing (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. In other words, the PUCCH resource of PUCCH format 3 includes an orthogonal cover code. The modulation symbol is transmitted by time division multiplexing (DMD) with DMRS.

1.3. Analog beamforming

In millimeter wave (mmW), 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.

In this case, each antenna element may include a TXRU (Transceiver Unit) to enable transmission power and phase adjustment for each antenna element. Through this, each antenna element may perform independent beamforming for each frequency resource.

However, in order to install TXRU in all 100 antenna elements, there is a problem in terms of cost effectiveness. Therefore, a method of mapping a plurality of antenna elements to a single TXRU and adjusting a beam direction with an analog phase shifter is considered. This analog beamforming method has a disadvantage in that frequency selective beamforming is difficult because only one beam direction can be made in the entire band.

As a solution to this problem, a hybrid BF having B TXRUs having a smaller number than Q antenna elements may be considered as an intermediate form between digital beamforming and analog beamforming. In this case, although there are differences depending on the connection scheme of the B TXRU and the Q antenna elements, the direction of the beam that can be transmitted at the same time may be limited to B or less.

14 and 15 illustrate exemplary connection schemes of a TXRU and an antenna element. Here, the TXRU virtualization model represents the relationship between the output signal of the TXRU and the output signal of the antenna element.

FIG. 14 is a diagram illustrating how a TXRU is connected to a sub-array. In the case of FIG. 14, the antenna element is connected to only one TXRU.

On the other hand, Figure 15 shows how the TXRU is connected to all antenna elements. In the case of FIG. 15, the antenna element is connected to all TXRUs. At this time, the antenna element requires a separate adder as shown in FIG. 15 to be connected to all TXRUs.

In Figures 14 and 15, W represents the phase vector multiplied by an analog phase shifter. In other words, W is a main parameter that determines the direction of analog beamforming. Here, the mapping between the CSI-RS antenna port and the TXRUs may be 1: 1 or 1: 1-to-many.

According to the configuration of FIG. 14, although focusing of beamforming is difficult, there is an advantage that the entire antenna configuration can be configured at a low cost.

According to the configuration of FIG. 15, there is an advantage in that focusing of beamforming is easy. However, since the TXRU is connected to all antenna elements, the overall cost increases.

When a plurality of antennas are used in an NR system to which the present invention is applicable, a hybrid beamforming technique combining digital beamforming and analog beamforming may be applied. At this time, analog beamforming (or RF (Radio Frequency) beamforming) refers to an operation of performing precoding (or combining) in the RF stage. In the hybrid beamforming, 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.

For convenience of description, the hybrid beamforming structure may be represented by N transceiver units (TXRUs) and M physical antennas. In this case, 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. Thereafter, 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.

16 is a diagram schematically illustrating a hybrid beamforming structure from a TXRU and a physical antenna perspective according to an example of the present invention. In this case, in FIG. 16, the number of digital beams is L and the number of analog beams is N.

In addition, in the NR system to which the present invention is applicable, the base station is designed to change the analog beamforming in units of symbols and considers a method for supporting more efficient beamforming for a terminal located in a specific region. Furthermore, when defining specific N TXRU and M RF antennas as one antenna panel as shown in FIG. 16, in the NR system according to the present invention, a plurality of antenna panels to which hybrid beamforming independent of each other is applicable may be defined. It is also considered to adopt.

When the base station utilizes a plurality of analog beams as described above, the analog beams advantageous for signal reception may be different for each terminal. Accordingly, in the NR system to which the present invention is applicable, 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.

FIG. 17 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.

In FIG. 17, 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). In this case, analog beams belonging to different antenna panels in one symbol may be transmitted simultaneously.

In addition, as shown in FIG. 17, in the NR system to which the present invention is applicable, a configuration for measuring channels for analog beams is applied to transmit a reference signal (Reference signal, The introduction of beam reference signals (Beam RS, BRS), which is RS, is under discussion. 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. At this time, unlike the BRS, 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.

1.4. Synchronization signal block (SSB or SS / PBCH block)

In an NR system to which the present invention is applicable, a primary synchronization signal (PSS), a secondary synchronization signal (SSS), and / or a physical broadcast channel (PBCH) may be a single synchronization signal block (Synchronization Signal Block or Synchronization Signal PBCH block, hereinafter SS block or SS / PBCH block). In this case, multiplexing other signals in the one SS block may not be excluded. (Multiplexing other signals are not precluded within a 'SS block').

The SS / PBCH block may be transmitted in a band that is not the center of the system band. In particular, when the base station supports broadband operation, the base station may transmit a plurality of SS / PBCH blocks.

18 is a diagram briefly showing an SS / PBCH block applicable to the present invention.

As shown in FIG. 18, the SS / PBCH block applicable to the present invention may be configured with 20 RBs in four consecutive OFDM symbols. In addition, the SS / PBCH block is composed of PSS, SSS, and PBCH, and the UE may perform cell search, system information acquisition, beam alignment for initial access, DL measurement, etc. based on the SS / PBCH block. .

PSS and SSS consist of 1 OFDM symbol and 127 subcarriers, respectively, and PBCH consists of 3 OFDM symbols and 576 subcarriers. Polar coding and quadrature phase shift keying (QPSK) are applied to the PBCH. The PBCH consists of a data RE and a demodulation reference signal (DMRS) RE for each OFDM symbol. Three DMRS REs exist for each RB, and three data REs exist between DMRS REs.

In addition, the SS / PBCH block may be transmitted in a frequency band other than the center frequency of the frequency band used by the network.

To this end, in the NR system to which the present invention is applicable, a synchronization raster which is a candidate frequency position where the UE should detect the SS / PBCH block is defined. The sync raster may be distinguished from a channel raster.

The synchronization raster may indicate a frequency position of the SS / PBCH block that the UE can use to obtain system information when there is no explicit signaling for the SS / PBCH block position.

In this case, the synchronization raster may be determined based on a Global Synchronization Channel Number (GSCN). The GSCN may be transmitted through RRC signaling (eg, MIB, SIB, RMSI, OSI, etc.).

Such a synchronization raster is defined longer in the frequency axis than the channel raster and has fewer blind detections in view of the complexity of the initial synchronization and the detection speed.

19 is a diagram briefly illustrating a configuration in which an SS / PBCH block applicable to the present invention is transmitted.

In the NR system to which the present invention is applicable, the base station may transmit a maximum of 64 SS / PBCH blocks for 5 ms. In this case, the plurality of SS / PBCH blocks are transmitted in different transmission beams, and the UE detects the SS / PBCH blocks on the assumption that the SS / PBCH blocks are transmitted every 20 ms based on a specific beam used for transmission. can do.

The maximum number of beams that the base station can use for SS / PBCH block transmission within a 5 ms time interval may be set as the frequency band increases. For example, in the band below 3 GHz, the base station may transmit the SS / PBCH block using up to four different beams within a 5 ms time interval, up to eight in the 3-6 GHz band, and up to 64 different beams in the 6 GHz or more band.

1.5. Synchronization procedure

The UE may perform synchronization by receiving the SS / PBCH block as described above from the gNB. At this time, the synchronization procedure includes a cell ID detection step and a timing detection step. Here, the cell ID detection step may include a cell ID detection step based on PSS and a cell ID detection step based on SSS. In addition, the timing detection step may include a timing detection step based on PBCH Demodulation Reference Signal (DM-RS) and a timing detection step based on PBCH contents (eg, Master Information Block (MIB)).

First, the UE may acquire a physical cell ID of a cell that is time-synchronized and detected through PSS and SSS detection. More specifically, the terminal may acquire symbol timing for the SS block through PSS detection and detect a cell ID in a cell ID group. Subsequently, the terminal detects the cell ID group through SSS detection.

In addition, the UE may detect a time index (eg, slot boundary) of the SS block through the DM-RS of the PBCH. Subsequently, the terminal may acquire half frame boundary information, system frame number (SFN) information, and the like through the MIB included in the PBCH.

In this case, the PBCH may inform that the associated (or corresponding) RMSI PDCCH / PDSCH is transmitted in the same band or a different band as the SS / PBCH block. Accordingly, the terminal may receive the RMSI (for example, system information other than the MIB (MIB) other than the MIB) transmitted after the PBCH decoding in the frequency band indicated by the PBCH or the frequency band in which the PBCH is transmitted. have.

In connection with the above operation, the terminal may obtain system information.

The MIB includes information / parameters for monitoring the PDCCH scheduling the PDSCH carrying the SIB1 (SystemInformationBlock1), and is transmitted to the terminal by the base station through the PBCH in the SS / PBCH block.

The UE may check whether a CORESET (Control Resource Set) exists for the Type0-PDCCH common search space based on the MIB. Type0-PDCCH common search space is a kind of PDCCH search space and is used to transmit PDCCH scheduling an SI message.

If there is a Type0-PDCCH common search space, the UE is based on information in the MIB (eg pdcch-ConfigSIB1), and (i) a plurality of contiguous resource blocks and one or more contiguous resource blocks that constitute CORESET. Symbols and (ii) PDCCH opportunity (eg, time domain location for PDCCH reception).

When the Type0-PDCCH common search space does not exist, pdcch-ConfigSIB1 provides information about a frequency position where SSB / SIB1 exists and a frequency range where SSB / SIB1 does not exist.

SIB1 includes information related to the availability and scheduling (eg, transmission period, SI-window size) of the remaining SIBs (hereinafter, SIBx, x is an integer of 2 or more). For example, SIB1 may inform whether SIBx is periodically broadcasted or provided by an on-demand scheme (or at the request of a terminal). When SIBx is provided by an on-demand scheme, SIB1 may include information necessary for the UE to perform an SI request. SIB1 is transmitted through PDSCH, PDCCH scheduling SIB1 is transmitted through Type0-PDCCH common search space, and SIB1 is transmitted through PDSCH indicated by the PDCCH.

1.6. Antenna ports quasi co-location

A list of the maximum M Transmission Configuration Indicator (M TCI) state configuration 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. Here, 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. For the case of two DL RSs, 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}

-'QCL-TypeB': {Doppler shift, Doppler spread}

-'QCL-TypeC': {Doppler shift, average delay}

'QCL-TypeD': {Spatial Rx parameter}

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. When the HARQ-ACK signal corresponding to the PDSCH including the activation command is transmitted in slot #n, the mapping between the code points of the TCI states and the TCI field in the DCI is slot # (n + 3 * N ^{subframe, μ} _slot + Applicable from 1). Here, N ^{subframe, μ} _slot is determined based on Table 1 or Table 2 described above. After the UE receives the initial higher layer configuration of TCI states and before the UE receives the activation command, the UE determines that the DMRS port (s) of the PDSCH of the serving cell is 'QCL-TypeA'. From the point of view, it is assumed that the SS / PBCH block and the QCL determined in the initial access procedure. In addition, 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 from the 'QCL-TypeD' perspective.

When the upper layer parameter tci-PresentInDCI is set to 'enabled' for CORESET scheduling PDSCH, 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.

If the upper layer parameter tci-PresentInDCI is set to 'enabled' and the TCI field in DCI scheduling a CC (component carrier) indicates an activated TCI states in the scheduled CC or DL BW (point to), the PDSCH Is scheduled by DCI format 1_1, 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. Assume that the DMRS port (s) are QCLed with RS (s) in the TCI state for the QCL type parameter (s) given by the indicated TCI stated. When a single slot PDSCH is configured for the terminal, the indicated TCI state should be based on activated TCI states in a slot of the scheduled PDSCH. When a CORESET associated with a search space set for cross-carrier scheduling is configured for the terminal, the terminal assumes that a higher layer parameter tci-PresentInDC I is set to 'enabled' for the CORESET. When one or more TCI states configured for the serving cell scheduled by the search region set include 'QCL-TypeD', the UE may determine a time between a reception time of a detected PDCCH in the search region set and a reception time of a corresponding PDSCH. The offset is expected to be greater than or equal to the threshold Threshold-Sched-Offset .

If 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 it is smaller than the threshold 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. (ii) At this time, the QCL parameter (s) is for the PDCCH QCL indication of the CORESET associated with the search area monitored with 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. (For both the cases when higher layer parameter tci-PresentInDCI is set to 'enabled' and the higher layer parameter tci-PresentInDCI is not configured in RRC connected mode, if the offset between the reception of the DL DCI and the corresponding PDSCH is less than the threshold Threshold-Sched-Offset, 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.)

In this case, 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 in 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.

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 status indicates one of the following QCL type (s):

'QCL-TypeC' for the SS / PBCH block, 'QCL-TypeD' for the same SS / PBCH block (when applicable), or

'QCL-TypeC' for the SS / PBCH block and, if applicable (QCL-TypeD), 'QCL for the periodic CSI-RS resource in the upper layer parameter NZP-CSI-RS-ResourceSet with higher layer parameter repetition set -TypeD '

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 to which the upper layer parameter trs-Info is set and (QCL-TypeD), if applicable, for the same CSI-RS resource. 'QCL-TypeD', or

'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 'QCL-TypeD' for the SS / PBCH block, if applicable. QCL-TypeD ', or

-'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

When 'QCL-TypeB' or 'QCL-TypeD' for the CSI-RS resource in the upper layer parameter NZP-CSI-RS-ResourceSet to which the upper layer parameter trs-Info is set is not applicable

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):

'QCL-TypeA' for the CSI-RS resource in the upper layer parameter NZP-CSI-RS-ResourceSet to which the upper layer parameter trs-Info is set and (QCL-TypeD), if applicable, for the same CSI-RS resource. 'QCL-TypeD', or

-'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 CSI-RS resource in layer parameter NZP-CSI-RS-ResourceSet , or

'QCL-TypeC' for the SS / PBCH block, and 'QCL-TypeD' for the same SS / PBCH block, if applicable (QCL-TypeD)

For DMRS of the PDCCH, the UE should assume that the TCI status indicates one of the following QCL type (s):

'QCL-TypeA' for the CSI-RS resource in the upper layer parameter NZP-CSI-RS-ResourceSet to which the upper layer parameter trs-Info is set and (QCL-TypeD), if applicable, for the same CSI-RS resource. 'QCL-TypeD', or

-'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 CSI-RS resource in layer parameter NZP-CSI-RS-ResourceSet , or

'QCL-TypeA' for the CSI-RS resource in the upper layer parameter NZP-CSI-RS-ResourceSet set without the upper layer parameter trs-Info and the upper layer parameter repetition and, if applicable (QCL-TypeD), the same CSI 'QCL-TypeD' for -RS resource

For DMRS of PDSCH, the UE 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 to which the upper layer parameter trs-Info is set and (QCL-TypeD), if applicable, for the same CSI-RS resource. 'QCL-TypeD', or

-'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 CSI-RS resource in layer parameter NZP-CSI-RS-ResourceSet , or

'QCL-TypeA' for the CSI-RS resource in the upper layer parameter NZP-CSI-RS-ResourceSet set without the upper layer parameter trs-Info and the upper layer parameter repetition and, if applicable (QCL-TypeD), the same CSI 'QCL-TypeD' for -RS resource

1.7. Bandwidth part (BWP)

In the NR system to which the present invention is applicable, up to 400 MHz frequency resource may be allocated / supported per one component carrier (CC). When a UE operating in such a wideband CC always operates with the radio frequency (RF) module for the entire CC turned on, battery consumption of the UE may increase.

Alternatively, when considering various usage examples operating within one broadband CC (e.g., eMBB (enhanced mobile broadband), URLLC, and mMTC (massive machine type communication, etc.)), different numerologies for each frequency band within the CC (e.g., sub-carrier spacing may be supported.

Or, the capability (capability) for the maximum bandwidth may be different for each UE.

In consideration of such a situation, the base station may instruct / set the UE to operate only in some bandwidths rather than the entire bandwidth of the broadband CC. Here, the corresponding partial bandwidth may be defined as a bandwidth part (BWP).

A BWP may consist of contiguous resource blocks (RBs) on the frequency axis, and one BWP may correspond to one neurology (eg, sub-carrier spacing, CP length, slot / mini-slot duration, etc.). have.

Meanwhile, the base station may configure a plurality of BWPs in one CC configured for the UE. For example, the base station may set a BWP occupying a relatively small frequency region in the PDCCH monitoring slot, and schedule a PDSCH indicated by the PDCCH (or a PDSCH scheduled by the PDCCH) on a larger BWP. Alternatively, the base station may set some UEs to another BWP for load balancing when the UEs flock to a specific BWP. Alternatively, the base station may exclude some spectrum of the entire bandwidth and set both BWPs in the same slot in consideration of frequency domain inter-cell interference cancellation between neighboring cells.

The base station may configure at least one DL / UL BWP to a UE associated with the broadband CC, and may configure at least one DL / UL BWP among the DL / UL BWP (s) configured at a specific time point (first layer signaling ( (Eg, DCI, etc.), MAC, RRC signaling, etc.) may be activated. In this case, the activated DL / UL BWP may be called an active DL / UL BWP. The UE, such as during an initial access process or before an RRC connection is set up, may not receive a setting for DL / UL BWP from a base station. The DL / UL BWP assumed for such a UE is defined as initial active DL / UL BWP.

1.8. CORESET (Control resource set)

One CORESET includes N ^CORESET _RB RBs in the frequency domain, and includes N ^CORESET _symb symbols (values having 1,2,3 values) in the time domain.

One control channel element (CCE) 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 can be interleaved or non-interleaved.

Configuration information for CORESET may be set by the upper layer parameter ControlResourceSet IE.

In addition, the configuration information for CORESET 0 (eg common CORESET) may be set by the upper layer parameter ControlResourceSetZero IE.

2. Unlicensed band system

20 shows an example of a wireless communication system supporting an unlicensed band applicable to the present invention.

In the following description, a cell operating in a licensed band (hereinafter referred to as L-band) is defined as an L-cell, and a carrier of the L-cell is defined as (DL / UL) LCC. In addition, a cell operating in an unlicensed band (hereinafter, referred to as a U-band) is defined as a U-cell, and a carrier of the U-cell is defined as (DL / UL) UCC. The carrier / carrier-frequency of the cell may refer to the operating frequency (eg, center frequency) of the cell. A cell / carrier (e.g., CC) is collectively referred to as a cell.

As shown in FIG. 20A, when the UE and the base station transmit and receive signals through the carrier-coupled LCC and the UCC, the LCC may be set to PCC (Primary CC) and the UCC may be set to SCC (Secondary CC).

As shown in FIG. 20B, the UE and the base station may transmit and receive signals through one UCC or a plurality of carrier-coupled LCCs and UCCs. That is, the terminal and the base station can transmit and receive signals only through the UCC (s) without the LCC.

Hereinafter, the operation of transmitting and receiving signals in the unlicensed band detailed in the present invention may be performed based on all the above-described deployment scenarios (unless otherwise mentioned).

2.1. Radio Frame Structure for Unlicensed Band

LTE frame structure type 3 (see FIG. 6) or NR frame structure (see FIG. 10) may be used for operation in the unlicensed band. The configuration of OFDM symbols occupied for uplink / downlink signal transmission in the frame structure for the unlicensed band may be set by the base station. In this case, the OFDM symbol may be replaced with an SC-FDM (A) symbol.

For downlink signal transmission through the unlicensed band, the base station can inform the terminal of the configuration of OFDM symbols used in subframe #n through signaling. In the following description, a subframe may be replaced with a slot or a time unit (TU).

In detail, in the LTE system supporting the unlicensed band, the UE transmits the subframe # through a specific field (eg, the Subframe configuration for LAA field) in the DCI received from the base station in subframe # n-1 or subframe #n. It is possible to assume (or identify) the configuration of OFDM symbols occupied in n.

Table 7 shows a configuration of OFDM symbols in which a subframe configuration for LAA field is used for transmission of a downlink physical channel and / or a physical signal in a current subframe and / or next subframe in an LTE system. The method to show is illustrated.

In order to transmit an uplink signal through an unlicensed band, the base station may inform the terminal of information about an uplink transmission interval through signaling.

In detail, in the LTE system supporting the unlicensed band, the UE may obtain 'UL duration' and 'UL offset' information for the subframe #n through the 'UL duration and offset' field in the detected DCI.

Table 8 illustrates how a UL duration and offset field indicates a UL offset and a UL duration configuration in an LTE system.

As an example, when the UL duration and offset field sets (or indicates) UL offset l and UL duration d for subframe #n, the UE may subframe # n + l + i (i = 0, 1,... There is no need to receive a downlink physical channel and / or a physical signal within d-1).

2.2. Downlink channel access procedure

The base station may perform a downlink channel access procedure (CAP) for the unlicensed band to transmit a downlink signal in the unlicensed band. In the following description, assuming that a base station is configured with a P cell that is a licensed band and an S cell that is one or more unlicensed bands, the unlicensed band is indicated as a licensed access access (LAA) S cell and is applicable to the present invention. The downlink CAP operation will be described in detail. However, the downlink CAP operation may be equally applied even when only an unlicensed band is configured for the base station.

2.2.1. Channel access procedure for transmission (s) including PDSCH / PDCCH / EPDCCH

The base station senses whether the channel is in an idle state during the slot duration of the delay duration T _d , and transmits the next LAA S cell (s) after the counter N becomes 0 in step 4 below. In this performed carrier, a transmission including PDSCH / PDCCH / EPDCCH may be transmitted. At this time, the counter N is adjusted by channel sensing for additional slot duration according to the following procedure:

1) Set N = N _init . Here, N _init is an arbitrary number of evenly distributed between _p is from 0 CW (random number uniformly distributed between 0 and CW p). Then go to step 4.

2) If N> 0 and the base station chooses to decrement the counter, set N = N-1.

3) Sensing a channel for an additional slot interval. At this time, if the additional slot interval is idle, go to step 4. If no, go to step 5.

4) If N = 0, stop the procedure. Otherwise, go to Step 2.

5) Add a delay interval T _d in the busy (busy), sensing the channel until the slot is detected or the further delay of all slot interval T _d are detected as idle.

6) If the corresponding channel is sensed as idle during all slot sections of the additional delay section T _d , the process moves to step 4. If no, go to step 5.

The CAP for transmission including the PDSCH / PDCCH / EPDCCH of the above-described base station can be summarized as follows.

21 is a view for explaining a CAP for unlicensed band transmission applicable to the present invention.

For downlink transmission, a transmitting node (eg, a base station) may initiate a channel access procedure (CAP) to operate in the LAA Scell (s), which are unlicensed band cells (S1810).

The base station may arbitrarily select the backoff counter N in the contention window CW according to step 1. At this time, the N value is set to an initial value N _init (S1820). N _init is selected from any value between 0 and CW _p .

Subsequently, if the backoff counter value N is 0 in step 4 (S1830; Y), the base station terminates the CAP process (S1832). Subsequently, the base station may perform Tx burst transmission including PDSCH / PDCCH / EPDCCH (S1834). On the other hand, if the backoff counter value is not 0 (S1830; N), the base station decreases the backoff counter value by 1 according to step 2 (S1840).

Subsequently, the base station checks whether the channel of the LAA S cell (s) is in an idle state (S1850), and if the channel is in an idle state (S1850; Y), the backoff counter value is 0 (S1830).

Conversely, if the channel is not idle in step S1850, that is, the channel is busy (S1850; N), the base station according to step 5 has a delay duration T _d longer than the slot time (eg 9usec) according to step 5; It is checked whether the channel is idle during the above (S1860). If the channel is idle in the delay period (S1870; Y), the base station may resume the CAP process again.

For example, if the backoff counter value N _init is 10 and the backoff counter value is reduced to 5 and the channel is determined to be busy, the base station senses the channel during the delay period and determines whether the channel is idle. At this time, if the channel is idle during the delay period, the base station does not set the backoff counter value N _init but performs the CAP process again from the backoff counter value 5 (or 4 after decreasing the backoff counter value by 1). Can be.

On the other hand, if the channel is busy during the delay period (S1870; N), the base station re-performs step S1860 to check again whether the channel is idle for a new delay period.

In the above procedure, if the base station does not transmit a transmission including PDSCH / PDCCH / EPDCCH on a carrier on which LAA S cell (s) transmission is performed after step 4, the base station transmits PDSCH / PDCCH on the carrier if the following conditions are satisfied. You can send a transmission that includes / EPDCCH:

When the base station is prepared to transmit PDSCH / PDCCH / EPDCCH and the channel is sensed as idle for at least the slot period T _sl , and the channel during all slot periods of the delay period T _d immediately before the transmission (immediately before) When sensed as children

On the contrary, when the base station senses the channel after being prepared for transmission, the slot is not sensed as idle during the slot period T _sl or one slot of the delay period T _d immediately before the intended transmission. If the channel is not sensed as idle during the interval, the base station proceeds to step 1 after sensing that the channel is idle during the slot interval of the delay period T _d (proceed to step 1).

The delay period T _d consists of a period T _f (= 16us) immediately following the m _p consecutive slot periods. Here, each slot section T _sl is 9us, and T _f includes an idle slot section T _sl at the start of T _f .

If the base station senses the channel during slot interval T _sl and the power detected by the base station for at least 4us in the slot interval is less than an energy detection threshold X _Thresh , the slot interval T _sl is considered to be idle. (Be considered to be idle). If not, the slot section T _sl is considered busy.

Denotes a contention window. Here, CW _p adjustment (CW _p adjustment) is described in detail in 2.2.3 described later to section.

And

Is chosen before step 1 of the procedure above.

,

And

Is determined based on a channel access priority class associated with transmission of the base station (see Table 9 below).

Is described later in 2.2.4. It is adjusted according to the clause.

In the procedure, when N> 0, when the base station transmits discovery signal transmission not including PDSCH / PDCCH / EPDCCH, the base station decrements the counter N during a slot period overlapping the discovery signal transmission. Don't let that happen.

The base station does not perform the above Table 9, the T _mcot, for a period of more than _p (for a period exceeding _{mcot T, p)} a continuous transmission on the carrier wave S LAA cell transmission is performed.

For p = 3 and p = 4 in Table 9, if the absence of other technology sharing the carrier can be guaranteed for a long period of time (e.g. by the level of regulation) (if the absence of any other technology sharing the carrier can be guaranteed on a long term basis (eg, by level of regulation), T _{mcot, p} is set to 10 ms. If not, T _{mcot, p} is set to 8 ms.

2.2.2. Channel access procedure for transmissions including discovery signal transmission (s) and not including PDSCH

If the transmission interval of the base station is less than 1ms, the base station includes a discovery signal transmission on a carrier on which the LAA S-cell transmission is performed immediately after the corresponding channel is sensed as idle for at least the sensing interval T _drs = 25 us. The transmission may not be transmitted. Here, T _drs is composed of a section T _f (= 16us) immediately following one slot section T _sl = 9us. T _f includes an idle slot interval T _sl at the start of T _f . If the channel is sensed idle during slot period T _drs , the channel is considered to be idle during T _drs .

2.2.3. Contention window adjustment procedure

If the base station performs a transmission including a PDSCH associated with a channel access priority class p on a carrier, the base station determines 2.2.1. Maintain the contention window value CW _p and adjust CW _p using the following procedures prior to step 1 of the procedure detailed in the section (ie, before performing the CAP):

1> all priority classes

for,

Set to

2> if at least Z = 80% of HARQ-ACK values corresponding to PDSCH transmission (s) in reference subframe k is determined to be NACK, then all priority classes

Increase CW _{p for} to the next higher allowed value and remain at step 2 (remain in step 2). If no, go to step 1.

In other words, when the probability that HARQ-ACK values corresponding to PDSCH transmission (s) in the reference subframe k is determined to be NACK is at least 80%, the base station allows each of the CW values set for each priority class, and then Increase by rank. Alternatively, the base station maintains the CW values set for each priority class as initial values.

Here, the reference subframe k is a starting subframe of the most recent transmission on the carrier made by the base station, where at least some HARQ-ACK feedback is expected to be available (Reference subframe k is the starting subframe of the most recent). transmission on the carrier made by the eNB, for which at least some HARQ-ACK feedback is expected to be available).

The base station has all priority classes

The CW _p value for is adjusted only once based on the given reference subframe k.

if

If, the next higher allowed value for the CW _p adjustment is

to be.

The probability (Z) for determining HARQ-ACK values corresponding to PDSCH transmission (s) in the reference subframe k as NACK may be determined in consideration of the following matters.

If the transmission (s) of the base station for which HARQ-ACK feedback is available starts in the second slot of subframe k, HARQ-ACK values corresponding to PDSCH transmission (s) in subframe k and additionally subframe k + 1 HARQ-ACK values corresponding to my PDSCH transmission (s) are also used

If the HARQ-ACK values correspond to PDSCH transmission (s) on the same LAA S cell allocated by the (E) PDCCH transmitted in the LAA S cell,

   If HARQ-ACK feedback for PDSCH transmission by the base station is not detected or if the base station detects a 'DTX', 'NACK / DTX' or other (any) state, it is counted as NACK (it is counted as NACK).

If the HARQ-ACK values correspond to PDSCH transmission (s) on another LAA S cell allocated by the (E) PDCCH transmitted in the LAA S cell,

   If HARQ-ACK feedback for PDSCH transmission by the base station is detected, the 'NACK / DTX' or other (any) state is counted as NACK and the 'DTX' state is ignored.

   If HARQ-ACK feedback for PDSCH transmission by the base station is not detected,

      If it is expected that PUCCH format 1 with channel selection to which channel selection is applied by the base station is used, the 'NACK / DTX' state corresponding to 'no transmission' is counted as NACK, The 'DTX' state corresponding to 'non-transmit' is ignored. If not, HARQ-ACK for the PDSCH transmission is ignored.

If the PDSCH transmission has two codewords, the HARQ-ACK value of each codeword is considered separately.

Bundled HARQ-ACK across M subframes is considered M HARQ-ACK responses.

If a base station transmits a PDCCH / EPDDCH of DCI format 0A / 0B / 4A / 4B (PDCCH / EDPCCH with DCI format 0A / 0B / 4A / 4B) and does not include a PDSCH associated with channel access priority class p When transmitting on a channel starting from t ₀ , the base station selects 2.2.1 for the transmission. Maintain the competing window size CW _p and adjust CW _p using the following procedures prior to step 1 of the procedure detailed in the section (ie, before performing the CAP):

1> all priority classes

for,

Set to

2> 10% of the UL transport block scheduled by the base station from the UE using the type 2 channel access procedure (described in section 2.3.1.2.) During the time intervals t ₀ and t ₀ + T _CO If less than is successfully received, all priority classes

Increase CW _{p for} to the next higher allowed value and remain at step 2 (remain in step 2). If no, go to step 1.

Here, T _CO is described later in 2.3.1. It is calculated according to the clause.

if

The case to be used in K times in succession to produce the N _init, the only use by K times in succession to produce the N _init

Only CW _p for priority classes for p is reset to CW _{min, p.} Where K is each priority class

Is selected by the base station from the set of {1, 2, ..., 8} values for.

2.2.4. Energy detection threshold adaptation procedure

The base station accessing the carrier on which the LAA _SCell transmission is performed sets the energy detection threshold X _Thresh to be equal to or less than the maximum energy detection threshold X _{Thresh_max} .

At this time, the maximum energy detection threshold X _{Thresh_max} is determined as follows.

If the absence of any other technology sharing the carrier can be guaranteed on a long term basis (eg, by level of regulation)),

-

Where X _r is the maximum energy detection threshold (in dBm) defined in the regulatory requirements if a regulation is defined. If not,

-If not,

-

Where each variable is defined as

2.2.5. Channel access procedure for transmission (s) on multiple carriers

The base station may access multiple carriers on which LAA S cell transmission is performed through one of the following Type A or Type B procedures.

2.2.5.1. Type A multi-carrier access procedures

In accordance with the procedures disclosed in this section, the base station shall

Perform phase channel connection. Here, C is a set of carriers to be transmitted by the base station (intend to transmit),

And q is the number of carriers to be transmitted by the base station.

2.2.1. Counter N in the clause (that is, counter N considered in the CAP)

Each carrier, the counter for each carrier

D. At this time,

Is 2.2.5.1.1. Or 2.2.5.1.2. Maintained according to the clause.

2.2.5.1.1. Type A1 (Type A1)

2.2.1. Counter N in the clause (that is, counter N considered in the CAP)

Determined independently for each carrier, and each carrier

D.

One of the carriers

If phase transmission ceases, if the absence of other technology sharing the carrier can be guaranteed for a longer period (e.g., by the level of regulation) (if the absence of any other technology sharing the carrier can be guaranteed on a long term basis (eg, by level of regulation), each carrier c _i , where c _i is different from c _j ,

)for,

After waiting for a section of or

If an idle slot is detected after reinitializing the BS, the BS

Resumption can be resumed.

2.2.5.1.2. Type A2 (Type A2)

Each carrier

Star counter N is described above in 2.2.1. Clause, and each carrier counter

D. here,

May mean a carrier having the largest CW _p value. Each carrier

for,

It can be set to.

The base station

If the UE ceases transmission for any one of the carriers determined, the base station for all carriers

Reinitialize

2.2.5.2. Type B multi-carrier access procedure

carrier

May be selected by the base station as follows.

The base station is a multi-carrier

Uniformly randomly from C prior to each phase of transmission

, Or

At least once every 1 second

Do not select

Here, C is a set of carriers to be transmitted by the base station (intend to transmit),

And q is the number of carriers to be transmitted by the base station.

carrier

For transmission on the base station, the base station is 2.2.5.2.1. Section or 2.2.5.2.2. With the modifications described in section 2.2.1. Carrier according to the procedure described in section

Perform channel access on the fly.

Carrier out of

For transmission on

Each carrier

For the base station is a carrier

At least a sensing interval immediately before transmission on the medium

While carrier

Sensing. And, the base station is at least sensing period

While carrier

(Immediately after) immediately after sensing that

The transmission can be performed on the. Given interval

My carrier

When the channel is sanded to idle during all time intervals when phase idle sensing is performed, the carrier

Is

Can be considered as children for.

The base station is a carrier

(At this time,

) For a period exceeding the T _{mcot, p} of Table 6 on (for a period exceeding _{mcot T, p)} it does not perform successive transmission. Where T _{mcot, p} is the carrier

It is determined using the channel access parameter used for

2.2.5.2.1. Type B1 (Type B1)

A single CW _p value is maintained for carrier set C.

carrier

To determine CW _p for phase channel access, see 2.2.3. Step 2 of the procedure described above in the section is modified as follows.

-All carriers

At least of HARQ-ACK values corresponding to PDSCH transmission (s) in reference subframe k of

If is determined to be NACK, then all priority classes

Increase CW _p to the next higher allowed value. If no, go to step 1.

2.2.5.2.2. Type B2 (Type B2)

2.2.3. Using the procedure described in the section, the CW _p value is calculated for each carrier

It is maintained independently for carrier

To determine N _init for the carrier

CW _p value of is used. here,

Is a carrier having the largest CW _p among all carriers in the set C.

2.3. Uplink channel access procedures

The UE and the base station scheduling the UL transmission for the UE perform the following procedure for access to the channel performing LAA S cell transmission (s). In the following description, an uplink CAP applicable to the present invention by basically displaying the unlicensed band as a LAA S cell on the assumption that a P cell that is a licensed band and an S cell that is one or more unlicensed bands are configured for a terminal and a base station. The operation will be described in detail. However, the uplink CAP operation may be equally applied even when only an unlicensed band is configured for the terminal and the base station.

2.3.1. Channel access procedure for uplink transmission (s)

The UE may access the carrier on which the LAA SCell UL transmission (s) are performed according to a type 1 or type 2 UL channel access procedure. Type 1 channel connection procedure is described in 2.3.1.1. This is described in detail in the section. Type 2 channel connection procedure is described in 2.3.1.2. This is described in detail in the section.

If the UL grant scheduling PUSCH transmission indicates a type 1 channel access procedure, unless otherwise stated in this section, the UE performs type 1 channel access to perform a transmission including the PUSCH transmission.

If the UL grant scheduling PUSCH transmission indicates a type 2 channel access procedure, unless otherwise stated in this section, the UE performs type 2 channel access to perform the transmission including the PUSCH transmission.

The UE performs Type 1 channel access for SRS (Sounding Reference Signal) transmission that does not include PUSCH transmission. UL channel access priority class p = 1 is used for SRS transmission that does not include a PUSCH.

If the 'UL configuration for LAA' field sets 'UL offset' l and 'UL duration' d for subframe n,

If the end of the UE transmission occurs in or before subframe n + l + d−1, then the UE is in subframe n + l + i (where

Type 2 channel access procedure may be used for intra-transmission.

If UE sets subframe using PDCCH DCI format 0B / 4B

Scheduled to perform a transmission including my PUSCH, the UE subframe

If a channel connection for intra transmission is not possible, the UE subframes according to the indicated channel access type in the DCI.

I should try to make my transmission (shall attempt to make a transmission). here,

W is the number of scheduling subframes indicated in the DCI.

If the UE sets a subframe using more than one PDCCH DCI format 0A / 0B / 4A / 4B

A subframe is scheduled to perform transmission without gaps including PUSCH, and after the UE connects to a carrier according to one of a type 1 or type 2 channel access procedure.

When performing my transmission, the UE is a subframe

May continue transmission in subframe after

). here,

to be.

If the start of UE transmission in subframe n + 1 immediately follows the end of UE transmission in subframe n (immediately follow), the UE does not expect different channel connection types to be indicated for transmission in the subframe.

If the UE subframes using more than one PDCCH DCI format 0A / 0B / 4A / 4B

Is scheduled to perform my transmission without gaps, if the UE

(here,

Stops transmission before or during the previous step, and if the channel is continuously sensed idle by the UE after the UE stops transmitting, the UE

Since (where

Transmission may be performed using a type 2 channel access procedure. If the channel is not continuously sensed as idle by the UE after the UE stops transmitting, the UE subframe

Since (where

) Subframe

The transmission may be performed using the Type 1 channel access procedure of the indicated UL channel access priority class in the DCI corresponding to.

If the UE receives the UL grant and the DCI indicates to start the PUSCH transmission in subframe n using the Type 1 channel access procedure, and if the UE continues the Type 1 channel access procedure before subframe n (the UE has an ongoing Type 1 channel access procedure before subframe n),

If the UL channel access priority class value p ₁ used for an ongoing Type 1 channel access procedure is greater than or equal to the indicated UL channel access priority class value p ₂ in the DCI, the UE responds to the UL grant The PUSCH transmission can be performed by accessing a carrier using an ongoing type 1 channel access procedure.

If the UL channel access priority class value p ₁ used for an ongoing Type 1 channel access procedure is less than the indicated UL channel access priority class value p ₂ in the DCI, the UE is in an ongoing channel access procedure Terminate

If the UE is scheduled to transmit on carrier set C in subframe n, the UL grant scheduling PUSCH transmission on carrier set C indicates a type 1 channel access procedure, and if the same 'for all carriers in carrier set C PUSCH starting position 'is indicated, and if the carrier frequencies of carrier set C are a subset of one of the preset carrier frequency sets,

The UE uses a type 2 channel access procedure

The transmission can be performed on the.

-If carrier

Awards (where,

Carrier immediately before UE transmission

The type 2 channel access procedure is performed on

If the UE uses a type 1 channel access procedure

The UE has accessed carrier

using Type 1 channel access procedure),

A carrier before performing a type 1 channel access procedure on any one carrier in carrier set C

Is uniformly randomly selected from the carrier set C by the UE.

The base station is 2.2.1. In the case of performing carrier phase transmission according to the channel access procedure disclosed in clause (the base station has transmitted on the carrier according to the channel access procedure described in clause 2.2.1), the base station performs a PUSCH on a carrier in subframe n. The type 2 channel access procedure may be indicated within the DCI of the UL grant that schedules the transmission.

Or the base station 2.2.1. In case of performing carrier phase transmission according to the channel access procedure described in the section, the base station uses a 'UL Configuration for LAA' field to transmit a type 2 channel access procedure for the UE including PUSCH on a carrier in subframe n. It can indicate that can be performed.

Alternatively, the sub-frame n = t ₀ when occurring within the starting and ending time period to t ₀ + T _CO from the base station is a carrier

A transmission including a PUSCH on a corresponding carrier can be scheduled in a subframe n following the transmission by the base station having a length. here,

Each variable can be defined as follows.

t ₀ : time instant at which the base station starts transmitting

T _{mcot, p} : 2.2. Determined by the base station according to the clause

T _g : total interval of all gap intervals greater than 25us that occur between the DL transmission of the base station starting from t ₀ and the UL transmission scheduled by the base station and between any two UL transmissions scheduled by the base station.

If UL transmissions are scheduled in succession, the base station schedules UL transmissions between successive subframes in t ₀ and t ₀ + T _CO .

For UL transmission on the carrier following transmission of the base station on an intra-length carrier, the UE may perform a type 2 channel access procedure for the UL transmission.

If the base station indicates a type 2 channel access procedure for the UE in DCI, the base station indicates the channel access priority class used to obtain a channel access in the DCI (If the base station indicates Type 2 channel access procedure for the UE in the DCI, the base station indicates the channel access priority class used to obtain access to the channel in the DCI).

2.3.1.1. Type 1 UL channel access procedure

After sensing that the channel is idle during the slot period of the delay period T _d and the counter N becomes 0 in step 4, the UE may perform transmission using a type 1 channel access procedure. At this time, the counter N is adjusted by sensing a channel for additional slot interval (s) according to the following procedure.

1) Set N = N _init . Here, N _init is an arbitrary number of evenly distributed between _p is from 0 CW (random number uniformly distributed between 0 and CW p). Then go to step 4.

2) If N> 0 and the UE chooses to decrement the counter, set N = N-1.

3) Sensing a channel for an additional slot interval. If the additional slot section is idle, go to step 4. If no, go to step 5.

4) If N = 0, stop the procedure. Otherwise, go to Step 2.

5) Add a delay interval T _d in the busy (busy), sensing the channel until the slot is detected or the further delay of all slot interval T _d are detected as idle.

6) If the channel is sensed as idle during all slot periods of the additional delay period T _d , go to Step 4. If no, go to step 5.

In summary, the type 1 UL CAP of the UE described above may be summarized as follows.

For uplink transmission, a transmitting node (eg, a UE) may initiate a channel access procedure (CAP) to operate in the LAA Scell (s), which are unlicensed band cells (S1810).

The UE may arbitrarily select the backoff counter N within the contention window CW according to step 1. At this time, the N value is set to an initial value N _init (S1820). N _init is selected from any value between 0 and CW _p .

Subsequently, if the backoff counter value N is 0 according to step 4 (S1830; Y), the UE ends the CAP process (S1832). Subsequently, the UE may perform Tx burst transmission (S1834). On the other hand, if the backoff counter value is not 0 (S1830; N), the UE decreases the backoff counter value by 1 according to step 2 (S1840).

Subsequently, the UE checks whether the channel of the LAA Scell (s) is in an idle state (S1850). If the channel is in an idle state (S1850; Y), the UE checks whether a backoff counter value is 0 (S1830).

Conversely, if the channel is not idle in step S1850, that is, if the channel is busy (S1850; N), the UE according to step 5 has a delay duration T _d longer than the slot time (eg 9usec) according to step 5; It is checked whether the channel is idle during the above (S1860). If the channel is idle in the delay period (S1870; Y), the UE may resume the CAP process again.

For example, if the backoff counter value N _init is 10 and the channel is determined to be busy after the backoff counter value is reduced to 5, the UE determines whether the channel is idle by sensing the channel during a delay period. At this time, if the channel is idle during the delay period, the UE does not set the backoff counter value N _init but performs the CAP process again from the backoff counter value 5 (or from the backoff counter value 1 by 4). Can be.

On the other hand, if the channel is busy during the delay period (S1870; N), the UE re-performs step S1860 to check again whether the channel is idle for a new delay period.

In the above procedure, if the UE does not transmit the transmission including the PUSCH on the carrier on which the LAA S cell transmission (s) is performed after Step 4 of the above-described procedure, the UE performs the PUSCH on the carrier if the following conditions are satisfied. You can send a transmission that you include.

When the UE is ready to perform transmission including PUSCH and at least the corresponding channel in slot interval T _sl is sensed as idle, and

When the channel is sensed as idle during all slot periods of the delay period T _d immediately before transmission including the PUSCH

Conversely, if the channel is first sensed after the UE is ready to perform transmission and the channel in slot interval T _sl is not sensed as idle, or the delay interval T _d just before the intended transmission including PUSCH If the channel is not sensed as an idle during a slot period, the UE proceeds to step 1 after the channel is sensed as an idle during the slot periods of the delay period T _d .

The delay period T _d consists of a period T _f (= 16us) immediately following the m _p consecutive slot periods. Here, each slot section T _sl is 9us, and T _f includes an idle slot section T _sl at the start of T _f .

If the UE senses a channel during slot interval T _sl and the power measured by the UE for at least 4us in the slot interval is less than an energy detection threshold X _Thresh , then the slot interval T _sl is considered to be idle. ). If not, the slot section T _sl is considered busy.

Denotes a contention window. Here, CW _p adjustment (CW _p adjustment) will be described in detail in 2.3.2 described later to section.

And

Is chosen before step 1 of the procedure above.

,

And

Is determined based on the channel access priority class signaled to the UE (see Table 10).

2.3.3. It is adjusted according to the clause.

2.3.1.2. Type 2 UL channel access procedure

If the UE uses a type 2 channel access procedure for transmission including the PUSCH, the UE is at least sensing period

While transmitting immediately after sensing that the channel is idle (immediately after), a transmission including a PUSCH may be transmitted. T _{short_ul} is one slot interval

Immediately following (immediately followed)

It consists of. T _f includes an idle slot section T _sl at the start of the T _f . If the phase is sensed idle during slot interval T _{short_ul} , then the channel is considered idle during T _{short_ul} .

2.3.2. Contention window adjustment procedure

If the UE performs transmission using a Type 1 channel access procedure associated with a channel access priority class p on a carrier, the UE may perform 2.3.1.1. Maintain the contention window value CW _p and adjust CW _p using the following procedures prior to step 1 of the procedure detailed in the section (ie, before performing the CAP):

When a new data indicator (NDI) value for at least one HARQ process associated with HARQ_ID_ref is toggled,

-All priority classes

for,

Set to

-If not, all priority classes

Increase CW _p for the next higher allowed value

Here, HARQ_ID_ref is a HARQ process ID of the UL-SCH in the reference subframe n _ref . The reference subframe n _ref is determined as follows.

The UE has received a UL grant in subframe n _g . Herein, the subframe n _w is the most recent subframe before subframe n _g -3 in which the UE transmits a UL-SCH using a type 1 channel access procedure.

If the UE is a subframe

In the case of performing transmission including a UL-SCH without a gap starting from subframe n ₀ , the reference subframe n _ref is subframe n ₀ .

If not, the reference subframe n _ref is a subframe n _w .

If the UE is a subframe set

Is scheduled to transmit using a Type 1 channel access procedure that includes a PUSCH within the gap, and if the UE is unable to perform any transmission including a PUSCH within the subframe set, then the UE Priority class

To keep the CW _p value unchanged.

If a reference subframe for recent scheduling transmission is also a subframe

If, then the UE is all priority classes

The CW _p value for may be kept equal to the CW _p value for transmission including PUSCH using a recently scheduled Type 1 channel access procedure.

if

If, the next higher allowed value for the CW _p adjustment is

to be.

if

The case to be used in K times in succession to produce the N _init, the only use by K times in succession to produce the N _init

Only CW _p for priority classes for p is reset to CW _{min, p.} Where K is each priority class

Is selected by the UE from the set of {1, 2, ..., 8} values for.

2.3.3. Energy detection threshold adaptation procedure

A UE accessing a carrier on which LAA _SCell transmission is performed sets an energy detection threshold (X _Thresh ) to a maximum energy detection threshold X _{Thresh_max} or less.

At this time, the maximum energy detection threshold X _{Thresh_max} is determined as follows.

If the UE is configured with a higher layer parameter 'maxEnergyDetectionThreshold-r14',

X _{Thresh_max} is set equal to the value signaled by the higher layer parameter.

-If not,

The UE has a 2.3.3.1. X ' _{Thresh_max} is determined according to the procedure described in the section.

   If the UE is configured with a higher layer parameter maxEnergyDetectionThresholdOffset-r14 ',

X _{Thresh_max} is set to X ' _{Thresh_max} adjusted according to the offset value signaled by the higher layer parameter.

   -If not,

The UE

Set to.

2.3.3.1. Default maximum energy detection threshold computation procedure

If the upper layer parameter 'ab senceOfAnyOtherTechnology-r14' indicates TRUE:

-

Where X _r is the maximum energy detection threshold (in dBm) defined in the regulatory requirements if a regulation is defined. If not,

If not:

-

Where each variable is defined as

2.4. Subframe / Slot Structure Applicable to Unlicensed Band System

FIG. 22 is a diagram illustrating a partial TTI or partial subframe / slot applicable to the present invention. FIG.

In a Release-13 LAA system, a partial TTI defined as DwPTS is defined to maximize the MCOT and support continuous transmission in DL transmission burst transmission. The partial TTI (or partial subframe) refers to a period in which a signal is transmitted by a length smaller than a conventional TTI (eg, 1 ms) in transmitting the PDSCH.

In the present invention, for convenience of description, a starting partial TTI or a starting partial subframe / slot refers to a form in which some front symbols of the subframe are emptied, and an ending partial TTI or ending partial subframe / A slot names a form in which some symbols behind the subframe are emptied. (On the other hand, intact TTIs are called Normal TTIs or Full TTIs.)

22 illustrates various types of partial TTIs described above. The first figure of FIG. 22 shows the ending partial TTI (or subframe / slot), and the second figure shows the starting partial TTI (or subframe / slot). In addition, the third drawing of FIG. 22 shows a partial TTI (or subframe / slot) in the form of emptying some symbols in front and back in the subframe / slot. In this case, a time interval excluding signal transmission in a general TTI is called a transmission gap (TX gap).

22 is described based on the DL operation, the same may be applied to the UL operation. As an example, a form in which a PUCCH and / or a PUSCH are transmitted may also be applied to the partial TTI structure illustrated in FIG. 22.

2.5. Signal transmission method based on beam sweeping

In a wireless communication system to which the present invention is applicable, a signal may be transmitted by beam sweeping for several time domains.

FIG. 23 is a diagram schematically illustrating a beam sweeping operation applicable to the present invention, and FIG. 24 is a diagram illustrating an example in which each beam is transmitted according to beam sweeping.

As shown in FIG. 23, when the eNB (or gNB) attempts DL signal transmission by sweeping four analog beams, as shown in FIG. 24, one TU is divided into several time domains to utilize each beam. DL transmission can be attempted. Similar methods can be extended for UL transmission.

In FIG. 24, 1 TU may mean 1 slot (or subframe), may mean multiple slots, may mean 1 symbol, or may mean various symbol intervals. have.

If 1 TU means 1 slot, each beam may be transmitted over several symbols. In this case, sizes of time domains allocated for each beam may be the same or differently set.

In FIG. 24, all of the beam indexes constituting the TU are differently represented for convenience of description, but some beams of the beams transmitted within a specific TU are set to be the same (for example, beam # A / A / B / B or beam # A / B). / A / B) or all beams can be set identically (e.g. beam # A / A / A / A)

In addition, only one beam direction transmission may be set for each TU, or multiple beam signals may be transmitted over multiple TUs with a gap for LBT. In this case, whether to transmit each beam signal may be determined according to the LBT result immediately before the TU starts.

Alternatively, the signal may be transmitted only in a specific beam direction determined to be idle according to the LBT result immediately before transmission. At this time, when the beam sweeping-based transmission is periodically set, the beam index actually transmitted may vary according to the LBT result for each period.

In addition, in the DL view, in consideration of the LBT for TU # 1 transmission of the side cell, the last part of the TU # 0 transmission may be set to be empty. On the contrary, in view of UL, in consideration of LBT for TU # 1 transmission of another UE, some last time domain of TU # 0 transmission may be set to be empty. Alternatively, the signal may be set to be transmitted until the last boundary of the TU without a gap region for the LBT.

Considering that the U-band can transmit a signal only if the LBT succeeds, even if all the signals to be transmitted in one TU can be included, if the LBT continues to fail during that TU, all the signals to be transmitted cannot be transmitted. Can be.

As a method for resolving this, the UE or the base station may be configured to transmit a signal through the TU after configuring a plurality of TUs that can transmit a signal, if the LBT succeeds.

As an example, when two TUs are configured as shown in FIG. 24, the UE or the base station may try LBT once more for TU # 1 transmission even if the UE fails the LBT for TU # 0. For convenience of explanation, it will be described assuming that two TUs are areas capable of transmitting signals, but the configuration may be extended even when N (N> 1) TUs (or corresponding N TUs are periodically allocated). have.

Hereinafter, a base station or a UE applicable to the present invention may perform a beam sweeping based signal transmission method according to an LBT failure as follows.

2.5.1. First signal transmission method based on beam sweeping

When the LBT is not successful until the base station or the UE is just before the start boundary of a specific TU, the base station or the UE may give up all transmissions on the corresponding TU and perform LBT for the next TU transmission.

25 is a diagram schematically showing a first signal transmission method based on beam sweeping applicable to the present invention.

As shown in FIG. 25, when the LBT for TU # 0 transmission does not succeed until just before the TU # 0 start boundary, the BS or UE gives up all transmissions on TU # 0 and the next TU # 1. Signal transmission can be performed by attempting LBT for transmission.

2.5.2. Second signal transmission method based on beam sweeping

Rather than the first signal transmission method described above, it may be advantageous for the base station or the UE to attempt (or perform) as much beam transmission as can be transmitted in the corresponding TU even if the LBT is not successful at the start boundary of the TU.

FIG. 26 is a diagram schematically illustrating a second signal transmission method based on beam sweeping applicable to the present invention.

As shown in FIG. 26, when the LBT succeeds from the second transmission beam based signal in the TU, the base station or the UE may attempt transmission within the corresponding TU section from the corresponding time domain.

More specifically, as shown in FIG. 26 (a), the base station or UE attempts to transmit while puncturing beam transmission corresponding to the time domain in which the LBT fails, or as shown in FIG. 26 (b), to transmit from the TU start boundary. The transmission can be attempted by shifting the beam.

2.5.3. Third signal transmission method based on beam sweeping

As described above, when the base station or the UE transmits a signal as in the above-described second signal transmission method, a problem may occur that some beam signals intended to be transmitted in the TU may be lost.

Accordingly, according to the third signal transmission method according to the present invention, the base station or the UE can transmit a beam signal that cannot be transmitted due to the LBT failure in the next TU.

27 is a diagram schematically showing a third signal transmission method based on beam sweeping applicable to the present invention.

First, as shown in FIG. 27 (a) or FIG. 27 (b), when the base station or the UE succeeds by performing the LBT during the gap for the LBT, the base station or the UE transmits the beam signal lost in the TU # 0 in the TU # 1. Can be. On the other hand, when the base station or the UE fails in the LBT during the gap for the LBT, the base station or UE may transmit a beam signal lost in TU # 0 after the LBT on the next TU or the next time domain of the TU (or To abandon transmission).

Alternatively, a signal for occupying a channel may be transmitted between TU # 0 and TU # 1 without being emptied by a separate gap. Accordingly, the base station or the UE may perform signal transmission without performing LBT between TU # 0 and TU # 1.

In order to minimize the signal transmission for such channel occupancy purposes, as shown in FIG. 27 (c) or FIG. 27 (d), a start time of a beam signal to be transmitted to TU # 1 without a gap between TU # 0 and TU # 1 is changed ( 27 (c)) or the start time of the beam signal to be transmitted to TU # 0 may be changed (FIG. 27 (d)).

In addition, in the transmission method of FIG. 27 (c) or 27 (d), the beam to be transmitted from the TU start boundary may be shifted and transmitted (that is, in beam # A / B / C / D order).

2.5.4. Fourth signal transmission method based on beam sweeping

In fact, when a signal is transmitted while beam sweeping in a TU, the Tx and / or Rx beam may also be swept and not easily multiplexed with other signals. Accordingly, signal transmission, once beam sweeping is performed, may be configured to be performed until the last boundary of the corresponding TU.

28 is a diagram briefly showing a fourth signal transmission method based on beam sweeping applicable to the present invention.

First, as shown in FIG. 28 (a) or FIG. 28 (b), when the base station or the UE succeeds by performing LBT during the gap for the LBT, the base station or the UE may transmit all beam signals even in TU # 1. However, when the base station or the UE fails in the LBT during the gap for the LBT, the base station or the UE may attempt to transmit the beam signal after performing the LBT on the next TU or the next time domain of the TU (or the corresponding signal Can abandon the transmission).

Alternatively, a signal for occupying a channel may be transmitted between TU # 0 and TU # 1 without being emptied by a separate gap. Accordingly, the base station or the UE may perform signal transmission without performing LBT between TU # 0 and TU # 1.

In order to minimize the signal transmission for the purpose of channel occupancy, as shown in FIG. 28 (c) or FIG. 28 (d), the starting point of the beam signal to be transmitted to TU # 1 without a gap is changed (FIG. 28 (c)) or the TU # The start time of the beam signal to be transmitted to 0 may be changed (FIG. 28 (d)).

In addition, in the transmission method of FIG. 28 (c) or FIG. 28 (d), the beam to be transmitted from the TU start boundary may be shifted and transmitted (ie, beam # A / B / C / D order).

2.5.5. A fifth signal transmission method based on beam sweeping

In the NR system to which the present invention is applicable, the maximum number of transmissions (L) of the SS block may be set for a predetermined time interval (for example, 5 ms) according to the frequency band. For example, L = 4 in a NR system below 3 GHz, L = 8 in a NR system below 6 GHz, and L = 64 in a MR system above 6 GHz.

In this case, the base station may have a degree of freedom to transmit only SS blocks smaller than L. In this case, even if only the number of SS blocks smaller than L is transmitted (in consideration of DL / UL scheduling flexibility), the BS does not necessarily need to transmit only consecutive SS block indexes.

Accordingly, the base station needs a separate method for notifying the UE of the actual SS block indexes. For example, the base station may inform the UE of the corresponding information through cell-specific RRC (eg, RMSI (remaining system information) and / or UE-specific RRC signaling).

When the base station transmits SS blocks smaller than L (ie, S <L), the base station may transmit the SS blocks as follows.

Opt. 1] If some SS blocks are not transmitted due to LBT, the base station assumes transmission of S (or S integer times) SS blocks and identifies SS blocks that have not been transmitted since the S (or integer times S) th SS block. send. In this case, the S value may be signaled through PBCH DM-RS or PBCH contents.

Opt. 2] If some SS blocks are not transmitted due to LBT, the base station always assumes the transmission of L (or L integer times) SS blocks, regardless of the S value, and assumes the “S + 1” th (or “Integer multiples of S”). +1 ”th) SS block to Lth (or“ integer times L ”) SS block is empty or used as other base station implementation, Lth (or integer times L) SS block time resource Transmit SS blocks that have not been transmitted since.

Opt. 3] SS block transmission assumed at initial connection When the default periodicity is T1 ms (eg T1 = 20), the base station transmits some SS block (s) not transmitted due to LBT failure every T2 (T2 <T1). send.

29 is a diagram briefly showing a fifth signal transmission method based on beam sweeping applicable to the present invention.

In FIG. 29, it is assumed that L = 4 and S = 2. At this time, FIG. 29 (a) shows a configuration in which the base station successfully transmits two LBT blocks from the start time point and transmits the LBT, and FIG. 29 (b) shows the above-mentioned [Opt. 1], FIG. 29 (c) shows Opt. 2], FIG. 29 (d) shows Opt. 3] simply shows an example of the operation.

Opt. 1], the retry SS block position according to the LBT failure may vary depending on the number of S. However, [Opt. 2], there may be an advantage that the relative position between the retry SS block position and the TU boundary can be fixed regardless of the S value. On the other hand, Opt. 2] may have the disadvantage that if there is no DL data to be sent in case of LBT failure, the channel must be occupied through a dummy signal or the channel must be emptied and LBT must be performed again.

3. Proposed Example

Hereinafter, the configuration proposed by the present invention will be described in more detail based on the technical spirit as described above.

As more communication devices demand greater communication capacity, efficient utilization of limited frequency bands is increasingly required. Accordingly, in the wireless communication system to which the present invention is applicable, the unlicensed band such as the 2.4 GHz band or the unlicensed band such as the 5/6 GHz and 60 GHz bands, which are mainly used by the existing WiFi system, is used for traffic offloading. The solution is being considered.

Basically, in the unlicensed band, it is assumed that each communication node transmits and receives a radio signal through competition. Accordingly, each communication node may perform channel sensing before transmitting a signal to confirm that no other communication node transmits a signal, and may perform signal transmission based on this. In the present invention, for convenience of description, such an operation is called a listen before talk (LBT) or a channel access procedure (CAP), and an operation of checking whether another communication node transmits a signal is called CS (carrier sensing). In addition, it is defined that the clear channel assessment (CCA) is confirmed that the other communication node does not transmit the signal.

In the present invention, the base station is described above in 2.2 for the signal transmission over the unlicensed band. The downlink channel access procedure of section can be performed and the terminal can perform the above-described 2.3 for signal transmission through the unlicensed band. The uplink channel access procedure of the clause may be performed. In addition, in the present invention, the base station or the terminal succeeds in the LBT or CAP, based on the operation of the LBT or CAP, the unlicensed band is determined to be idle and the base station or terminal at the time when the base station or the terminal wants to start transmitting the unlicensed band. This may mean that signal transmission is performed. On the other hand, when the base station or the terminal fails the LBT or CAP, based on the LBT or CAP operation, the corresponding unlicensed band is determined to be busy and the signal is transmitted through the unlicensed band when the base station or the terminal intends to start signal transmission. This may mean that you cannot perform. In the present invention, a configuration in which a communication device performs signal transmission on an unlicensed band through such a series of processes will be described as the communication device performing / transmitting (DL or UL) transmission using a CAP.

As such, in order to transmit a signal in an unlicensed band (hereinafter, referred to as U-band) in a wireless communication system to which the present invention is applicable, the base station or terminal must perform LBT or CAP.

2.5 ahead. As described above in the section, the base station applicable to the present invention may transmit a signal based on beam sweeping (eg, SS / PBCH block) according to various methods in consideration of the case where the CAP fails.

In the NR system to which the present invention is applicable, system information required for initial access including a RACH (Random Access Channel) setting is transmitted in a system information (RSI), and the RMSI is scheduled by PDCCH. It may be transmitted to the terminal through the PDSCH.

In the present invention, particularly in consideration of the characteristics of the unlicensed band, the time / frequency resource region in which the PDCCH scheduling the PDSCH carrying the RMSI can be transmitted is an SS block or an SS / PBCH block. collectively referred to as a block) (ie, linkage can be set). Specifically, the setting for the time / frequency resource (or control resource set, CORESET) and the number of blind detection for each aggregation level that the PDCCH can be transmitted is called a search space (SS) set. When defining, the search region set and the SS block index may be linked to each other, and specific SS set information may be set through PBCH for each SS block.

30 is a diagram briefly illustrating a connection relationship between an SS block and an SS set applicable to the present invention.

In the present invention, a time domain multiplexing (TDM) and / or frequency domain multiplexing (FDM) may be applied as a multiplexing method for the SS block and the SS set.

More specifically, as shown in FIG. 30, the SS block and the SS set may be set to be TDM. At this time, the base station uses two SS set # 0/1 on TU # X (or SS set # on TU # 0/1) through the PBCH of SS block index # 0 (or SS block index # 1 or SS block index # 2). It may signal that 1/2 or SS set # 2/3 on TU # 1 are linked with the SS block index # 0 (or SS block index # 1 or SS block index # 2), respectively. Correspondingly, the UE may perform PDCCH monitoring on two SS sets to detect a PDCCH and receive an RMSI through a PDSCH scheduled by the detected PDCCH.

In FIG. 30, the configuration proposed by the present invention has been briefly described, but in an embodiment applicable to the present invention, the number of SS sets linked to one SS block index may be one or more, and the SS linked to different SS block indexes. set may be set to overlap or not overlap each other on the time axis.

Alternatively, in some cases, all (or some) of the SS set linked to the SS block transmitted in TU # 0 may be transmitted in the same TU (or TU preceding TU # 0), and one or more SS blocks in one TU. Or SS set may exist. In the present invention, one TU may correspond to one slot (or a plurality of slots).

The above-described configuration may be similarly applied between the SS block and the RACH occasion (RO). Specifically, the RO may be composed of a single or a plurality of symbol regions and a plurality of RB regions, and the mapping relationship (or link relation) between the SS block and the RO may be one-to-one, one-to-many, many-to Both -one and many-to-many mappings can be supported. In this case, the mapping method may be set through RACH configuration on system information (SI).

Hereinafter, the SS according to the SSB transmission method when the base station does not succeed in the CAP for the SSB, the DLB of the UE according to the success or failure of the CAP for the PDCCH / PDSCH or RACH occasion for the SSB of the base station or system information (associated with the SSB); The UL operation method will be described in detail.

3.1. SSB Transmission Method According to CAP Success of Base Station

3.1.1. Method 1: Changing the Position / Order Between SSB Indexes at Specific Cycles

In the following description, the same SSB or the same SSB index means (1) an SSB transmitted by a base station using the same TX beam filter, or (2) some / all of the information carried by the SSB mean the same SSBs. Alternatively, (3) may refer to an SSB received by the UE using the same RX beam filter. In other words, in the present invention, the same SSB or the same SSB index may be interpreted as an SSB having the same beam, the same beam index, or the QCL relationship.

When the base station transmits SSBs continuously for a predetermined time from the time of successful CAP, the transmission probability between the preceding SSB (ie, SSB having a lower index) and the following SSB (ie, SSB having a higher index) in time is Can be different. Specifically, the transmission probability of the SSB that follows in time (that is, the SSB having higher index) may be higher than that of the SSB preceding in time (that is, the SSB having the lower index). Accordingly, transmission fairness between SSB indexes may not be guaranteed. As another example, when a window in which an SSB can be transmitted is set and a plurality of transmission candidate positions corresponding to one SSB index can be set in the window in consideration of a CAP failure, a window corresponding to one SSB index in a window can be set. If the number of transmission candidate positions is different for each SSB index, transmission fairness may not be guaranteed. At this time, the base station may start the transmission of SSBs from the time when the base station succeeds in actual CAP of a plurality of transmission candidate positions. As a specific example, it is assumed that the total transmission candidate positions are 10 and the total number of SSB indexes is 4 in the window through which the SSB can be transmitted. In this case, if the transmission SSB index for each candidate position is determined in the order of 0/1/2/3/0/1/2/3/0/1, the number of transmission candidate positions corresponding to SSB index 0/1 is three. The number of transmission candidate positions corresponding to SSB index 2/3 is two. That is, the number of candidate positions for each SSB index may be different.

Accordingly, in the present invention, in consideration of the above problems, the SSB index order transmitted every specific period may be shuffling. For example, when the SSB index is transmitted in the order of 0/1/2/3 in radio frame # n, the base station transmits the SSB index in the order of 1/2/3/0 in radio fram # n + k and the radio frame # The SSB index can be transmitted in 2/3/0/1 order in n + 2k. As another example, when the SSB index is transmitted in the order of 0/1/2/3/0/1/2/3/0/1 in radio frame # n, the base station sets the SSB index to 1 in radio fram # n + k. / 2/3/0/1/2/3/0/1/2 and transmit SSB index 2/3/0/1/2/3/0/1/2 / in radio frame # n + 2k You can send in three orders.

In this case, the period in which the SSB index is changed may be determined in advance (for example, 20 msec or SMTC (SSB based Measurement Timing Configuration) periodicity) or may be set by RRC signaling. In addition, the position / order between SSB indexes transmitted according to the change period of the SSB index may be determined in advance, set by RRC signaling, or determined based on a function of parameter (s) such as cell / slot ID.

Such a method may be preferable when puncturing is applied to a signal (or beam) transmission corresponding to a time domain in which a base station fails a CAP as illustrated in FIG. 26. Alternatively, such a method may include SSBs that may not perform cell detection (eg, SSBs transmitted at short / long periods of 20 msec, which is the default periodicity, non-stand-by). SSBs transmitted on a single cell or Scell, or SSBs transmitted outside a configured SMTC window, or SSBs having no synchronization raster as the center frequency. Alternatively, this method can be applied for SSB transmission with a specific numerology (eg 15 kHz SCS).

3.1.2. Second method: when the base station transmits a signal after performing CAP for each SSB or SSB group among SS burst sets, an SS burst set transmission method according to whether the base station CAP succeeds or fails

In the present invention, there is a restriction on the maximum time allowed for continuous transmission according to the success of the CAP of the base station (case 1), or a timing gap exists between SSBs or between SSB groups (case 2), When a directional CAP for each signal (or beam) needs to be performed whenever transmission resources (or transmission beams) are different for each SSB or SSB group (case 3), the following method may be applied.

As an example of Case 1, if it is determined that the channel is idle only for a certain time (for example, 25 usec), it is assumed that there is a restriction that continuous transmission is allowed within a maximum of 1 msec for the CAP to which signal transmission is allowed. In this case, the base station may perform CAP for each SSB group that can be transmitted within 1 msec.

FIG. 31 is a diagram briefly showing an SSB transmission method of a base station through an unlicensed band applicable to the present invention.

In FIG. 31, an example of applying a CAP for each SSB is illustrated. However, in the embodiment applicable to the present invention, one SSB may be replaced with an SSB group.

FIG. 31 (a) is an example illustrating a configuration in which a base station performs CAP for each SSB for four SSBs (SSB # A / # B / # C / # D), and all succeed in CAP and transmit corresponding signals. 31 (b) to 31 (d) show various examples of transmitting the SSB when a CAP for some SSBs of four SSBs of the base station fails.

Option 1 (Fig. 31 (b))

If the base station fails the CAP for some SSBs (or SSB groups), then the base station punctures the corresponding SSB (or SSB group) that failed (CAP failed), and then the next occasion corresponding to the punctured SSB (s). CAP may be performed to transmit a corresponding signal upon successful CAP. As a more specific example, as illustrated in FIG. 31 (b), the base station may puncture the SSB # B / C which fails the CAP, and then attempt the CAP at a corresponding occasion to transmit a corresponding signal.

Option 2 (Fig. 31 (c))

If the base station fails the CAP for some SSBs (or SSB groups), the base station delays the transmission of the corresponding SSB (or SSB group) (which failed the CAP), and then the corresponding SSB ( Or SSB group) transmission. As a more specific example, as shown in the example of FIG. 31 (c), the base station may perform signal transmission in the order of successive CAP SSB # A, SSB # B, SSB # C, SSB # D.

Option 3 (Fig. 31 (d))

When the base station performs transmission of the SS burst set based on the beam sweeping, the base station performs directional CAP for each signal (or for each beam or corresponding to each Tx beam) to perform only a successful signal (or beam direction or successful). Only the Tx beam direction) SSB (s) corresponding to the beam direction may be transmitted. As a more specific example, as shown in the example of FIG. 31 (d), it is assumed that the base station succeeds only for a CAP corresponding to SSB # A / D by performing a CAP corresponding to SSB # A / B / C / D. In this case, the base station may transmit only SSB # A and SSB # D.

In this case, the SSB # A and SSB # D are (i) are actually transmitted in the time resources scheduled to be transmitted upon all CAP success, (ii) are continuously transmitted without a time gap between SSB # A and SSB # D, or (iii) SSB # A / D is transmitted in SSB # A / B time resources, and a dummy signal for channel occupation may be transmitted during the time gap between SSB # A and SSB # D actually transmitted.

3.2. DL / UL transmission / reception method of UE according to success or failure of CAP for PDCCH / PDSCH or RACH occasion for SSB of BS or system information (linked with SSB)

3.2.1. Method 1: DL / UL transmission / reception method of a terminal during SSB transmission candidate configured based on CAP failure of SSB of base station

In preparation for CAP failure for the SSB of the base station, an opportunity for additional transmission of the SSB may be provided for the base station at an additional occasion. In this case, the additional occasion is set in consideration of the failure of the SSB transmission in the previous occasion, and the additional occasion is used for the corresponding SSB transmission depending on whether the CAP succeeds or fails for the corresponding SSB in the previous occasion. It may not be.

As a specific example, in FIG. 29 (d), when the base station successfully transmits a corresponding signal after the CAP for beam # 0 of TU # 0, the base station may not transmit beam # 0 in TU # N. Conversely, when the base station fails the CAP for beam # 0 of TU # 0, the base station may transmit beam # 0 in TU # N. In the above description, the beam may be replaced with a corresponding signal or resource.

Hereinafter, it is assumed that the slot # y may be utilized as an additional occasion for the SSB to be transmitted in the slot # x. In this case, the terminal according to the present invention may perform DL reception and UL transmission as follows on slot # y.

For example, only if a UE detects an SSB to be transmitted in slot # x, the UE may expect to receive a PDSCH or PDCCH on a time / frequency resource region (or symbols including the region) of the SSB in slot # y. Can be.

As another example, only if a UE detects an SSB to be transmitted in slot # x, the UE transmits a PUSCH or PUCCH on a time / frequency resource region (or symbols including the region) of the SSB in slot # y (eg : It can be expected that the Semi Persistent Scheduling (SPS) PUSCH, semi-persistent UCI on PUSCH / PUCCH, etc. can be allowed (when the CAP of the UE is successful).

The above-described method may be used to configure other broadcast data (or broadcast data scheduling DCI) set in preparation for a CAP failure for broadcast data (or broadcast data scheduling DCI) transmission such as RMSI (or other system information (OSI) or paging). The same applies when a transmission occasion is provided. That is, when slot # y can be used as an additional occasion for broadcast data (or broadcast data scheduling DCI) that the base station wants to transmit in slot # x, a specific UE according to the above-described configuration, the specific terminal is PDSCH on slot # y. You can expect / PDCCH reception and / or PUSCH / PUCCH transmission.

3.2.2. Second method: DL / UL transmission / reception method of UE based on success or failure of CAP for RO of UE

In general, the UE may not expect DL reception at the RO. Because even though the UE does not transmit the RACH in the configured RO, the base station is trying to receive the RACH in consideration of any UE that is performing the RACH transmission in the corresponding RO, and simultaneous transmission and reception of the base station is difficult in a general implementation. to be.

However, due to the nature of the unlicensed band, only the UE which has succeeded in the CAP can start transmitting the RACH. If the base station does not detect the RACH in the RO and performs the CAP (performed after confirming that the RACH is not detected), the DL is transmitted in the corresponding RO. You can also do

Similarly, even when the UE does not perform the RACH transmission (or fails in the CAP for RACH transmission), the DL signal can be monitored assuming that the DL signal can be transmitted in the set RO. Accordingly, when the RACH signal (transmitted by another UE) is detected in the RO or the DL signal is not detected (for a predetermined time in the RO), the DL monitoring may be stopped and power saving may be performed during the corresponding RO.

32 is a diagram illustrating the operation of a terminal and a base station applicable to the present invention, FIG. 33 is a flowchart illustrating the operation of a terminal applicable to the present invention, and FIG. 34 is a flowchart illustrating the operation of a base station applicable to the present invention.

In the present invention, the SSB index is transmitted during the first SSB transmission interval in a specific period, based on the change in the SSB index order transmitted in the synchronization signal block (SSB) transmission interval according to a certain period. Obtain information on the order (S3210, S3310).

In this case, obtaining the information includes: (i) obtaining period information for the predetermined period; And (ii) obtaining index order information on the SSB index order transmitted during the SSB transmission interval for each period, based on the period information.

The acquiring of the periodic information may include one of acquiring the periodic information from preset information or receiving the periodic information through higher layer signaling (S2912).

The acquiring the index order information may include acquiring the index order information on the SSB index order transmitted during the SSB transmission period for each period from preset information, or the SSB transmission period for each period through higher layer signaling. Receive the index order information for the SSB index order transmitted during (S3214), or based on the identification information of the cell connected to the terminal, the index order information for the SSB index order transmitted during the SSB transmission interval for each period Or acquiring the index order information on the SSB index order transmitted during the SSB transmission period for each period, based on the identification information of the slot associated with the SSB transmission period.

Corresponding to the operation of the terminal, the base station according to the present invention also, based on a change in the sequence of the synchronization signal block (SSB) index transmitted in the synchronization signal block (SSB) transmission interval according to a certain period, the first in a specific period Information on the SSB index order transmitted during the SSB transmission interval may be obtained (S3410). In this case, the base station obtains the information, the base station obtains the information using a predetermined method (for example, using a function based on a predetermined default parameter or other parameters), or the base station arbitrarily set It may include doing. Subsequently, the base station may (optionally) transmit period information and index order information on the SSB to the terminal (S3212 and S3214).

Subsequently, the base station may perform transmission of SSBs corresponding to one or more SSB indexes using a channel access procedure (CAP) during the first SSB transmission period on the unlicensed band based on the information (S3220). In other words, after confirming that the unlicensed band is in an idle state through the CAP, the base station may transmit the SSB according to the SSB index order determined based on the information (S3230, S3420).

Correspondingly, on the basis of the information, the UE may receive an SSB corresponding to at least one SSB index during the first SSB transmission period on the unlicensed band (S3230 and S3320). Subsequently, the terminal may acquire the data transmitted through the SSB and perform an operation related thereto (S3240 and S3330).

In the present invention, the SSB received by the terminal during the first SSB transmission interval based on the information may be a different SSB from the SSB for initial access. In other words, as suggested by the present invention, the SSB whose SSB index is changed at regular intervals may not include the SSB for initial access. In this case, the SSB may be transmitted in a different resource from the SSB for the initial access.

Alternatively, the SSB received by the terminal during the first SSB transmission interval based on the information may correspond to an SSB based on numerology including a 15 kHz subcarrier spacing. In other words, as for the SSB in which the SSB index is changed at regular intervals, only the numerology including the 15 kHz subcarrier may be applied.

In the present invention, the first SSB transmission interval may include a first time interval for transmission of one or more SSBs based on the SSB index order transmitted during the first SSB transmission interval; And a second time interval for transmitting the additional SSB corresponding to the SSB index not transmitted during the first time interval.

In this case, the first time interval may be configured to precede in the time domain than the second time interval.

In addition, the terminal performing reception of the SSB corresponding to the at least one SSB index during the first SSB transmission period on the unlicensed band may be transmitted during the first SSB transmission period during the first time interval. Perform monitoring for one or more first SSBs based on the SSB index order; Performing additional monitoring for additional SSBs corresponding to SSB indexes not received during the first time period during the second time period when there are SSB indexes not received during the first time period among all SSB indexes. It may include.

Alternatively, the terminal may operate as follows based on the one or more first SSB indexes related to the SSB received during the first time interval.

During a time interval for transmission of an additional SSB corresponding to the first SSB index in the second time interval,

(i) monitoring a physical downlink control channel (PDSCH) signal or a physical downlink shared channel (PDSCH) signal on the unlicensed band, or

(ii) performing transmission of a physical uplink control channel (PUCCH) signal or a physical uplink shared channel (PUSCH) signal on the unlicensed band based on a channel access procedure (CAP) for the unlicensed band;

In response, the base station may perform transmission of the SSB corresponding to the one or more SSB indexes as follows using the CAP during the first SSB transmission period on the unlicensed band.

Performing transmission of an SSB corresponding to at least one first SSB index on the unlicensed band based on the SSB index order transmitted during the first SSB transmission interval and the CAP for each SSB during the first time interval; And

If there is a second SSB index not transmitted during the first time interval among all SSB indexes, the additional SSB corresponding to the second SSB index through the unlicensed band using the CAP during the second time interval; Perform the transfer

It is obvious that examples of the proposed scheme described above may also be regarded as a kind of proposed schemes as they may be included as one of the implementation methods of the present invention. In addition, although the above-described proposed schemes may be independently implemented, some proposed schemes may be implemented in a combination (or merge) form. Information on whether the proposed methods are applied (or information on the rules of the proposed methods) may be defined so that the base station informs the terminal through a predefined signal (eg, a physical layer signal or a higher layer signal). have.

4. Device Configuration

35 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. 35 operate to implement embodiments of the method of operating the terminal and the base station in the unlicensed band described above.

A UE 1001 may operate as a transmitting end in uplink and a receiving end in downlink. In addition, the base station (eNB or gNB) 1100 may operate as a receiver in uplink and as a transmitter in downlink.

That is, 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.

In addition, the terminal and the base station each include a processor 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.

In one example, 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. For example, 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. Here, 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. In addition, the terminal and base station of FIG. 35 may further include a low power radio frequency (RF) / intermediate frequency (IF) unit.

36 is a block diagram of a communication device in which proposed embodiments can be implemented.

The apparatus shown in FIG. 36 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.

As shown in FIG. 36, the apparatus may include a digital signal processor (DSP) / microprocessor 1210 and a radio frequency (RF) module (transceiver) 1235. The DSP / microprocessor 1210 is electrically connected to the transceiver 1235 to control the transceiver 1235. The device may be adapted to the power management module 1205, the battery 1255, the display 1215, the keypad 1220, the SIM card 1225, the memory device 1230, the antenna 1240, and the speaker (depending on the designer's choice). 1245 and input device 1250 may further be included.

In particular, FIG. 36 may represent a terminal including a receiver 1235 configured to receive a request message from a network and a transmitter 1235 configured to transmit timing transmit / receive timing information to the network. Such a receiver and a transmitter may constitute a transceiver 1235. The terminal may further include a processor 1210 connected to a transceiver (receiver and transmitter) 1235.

36 may also show a network device including a transmitter 1235 configured to transmit a request message to a terminal and a receiver 1235 configured to receive transmission and reception timing information from the terminal. The transmitter and receiver may configure a transceiver 1235. The network further includes a processor 1210 coupled to the transmitter and the receiver. The processor 1210 may calculate a latency based on the transmission / reception timing information.

Accordingly, a processor included in a terminal (or a communication device included in the terminal) and a processor included in a base station (or a communication device included in the base station) according to the present invention may control a corresponding memory and operate as follows. have.

In the present invention, 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 to cause the at least one processor to perform the following operation when executed. In this case, 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 including a module.

The processor included in the terminal (or the processor of the communication apparatus included in the terminal) may be configured based on a change in the order of the synchronization signal block (SSB) indexes transmitted in the synchronization signal block (SSB) transmission interval according to a predetermined period. Acquires information on the SSB index order transmitted during a first SSB transmission period in a period, and controls the at least one RF module based on the information to control one or more SSBs during the first SSB transmission period on the unlicensed band. It may be configured to perform the reception of the SSB corresponding to the index.

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.

In the present invention, 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 to cause the at least one processor to perform the following operation when executed. In this case, 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 including a module.

At least one processor included in the base station (or at least one processor of the communication apparatus included in the base station) has a synchronization signal block (SSB) index order transmitted within a synchronization signal block (SSB) transmission interval according to a predetermined period. Based on the changed, obtaining information about the SSB index order transmitted during the first SSB transmission interval within a specific period; And controlling the at least one RF module based on the information to perform transmission of an SSB corresponding to at least one SSB index using a channel access procedure (CAP) during the first SSB transmission interval on the unlicensed band. Can be.

Meanwhile, in the present invention, the terminal is a personal digital assistant (PDA), a cellular phone, a personal communication service (PCS) phone, a GSM (Global System for Mobile) phone, a WCDMA (Wideband CDMA) phone, an MBS. A Mobile Broadband System phone, a hand-held PC, a notebook PC, a smart phone, or a Multi Mode-Multi Band (MM-MB) terminal may be used.

Here, 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. have. In addition, a multimode multiband terminal can be equipped with a multi-modem chip to 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.

Embodiments of the invention may be implemented through various means. For example, embodiments of the present invention may be implemented by hardware, firmware, software, or a combination thereof.

In the case of a hardware implementation, 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.

In the case of an implementation by firmware or software, 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. For example, software code may be stored in memory units 50 and 150 and driven by processors 40 and 140. 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, an unmanned aerial vehicle (UAV), an artificial intelligence (AI) module, It may be a robot, an Augmented Reality (AR) device, a Virtual Reality (VR) device, or other device.

For example, 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. . For example, a drone may be a vehicle in which humans fly by radio control signals. For example, the HMD may be a display device worn on the head. For example, the HMD can be used to implement VR or AR.

The invention can be embodied in other specific forms without departing from the technical idea and essential features of the invention. Accordingly, the above detailed description should not be construed as limiting in all aspects and should be considered as illustrative. The scope of the invention should be determined by reasonable interpretation of the appended claims, and all changes within the equivalent scope of the invention are included in the scope of the invention. In addition, the claims may be incorporated into claims that do not have an explicit citation relationship in the claims, or may be incorporated into new claims by amendment after filing.

Embodiments of the present invention can be applied to various wireless access systems. Examples of various radio access systems include 3rd Generation Partnership Project (3GPP) or 3GPP2 systems. Embodiments of the present invention can be applied not only to the various wireless access systems, but also to all technical fields to which the various wireless access systems are applied. Furthermore, the proposed method can be applied to mmWave communication system using ultra high frequency band.

Claims (17)

1. A method of operating a terminal in a wireless communication system supporting an unlicensed band,

   Acquiring information about the SSB index order transmitted during the first SSB transmission period in a specific period based on a change of the synchronization signal block (SSB) index order transmitted in the synchronization signal block (SSB) transmission period according to a predetermined period; And

   Based on the information, performing the reception of an SSB corresponding to at least one SSB index during the first SSB transmission interval on the unlicensed band.
2. The method of claim 1,

   Acquiring the information,

   Obtaining period information for the predetermined period; And

   Based on the period information, acquiring index order information on an SSB index order transmitted during an SSB transmission interval for each period, operating method of a terminal in an unlicensed band.
3. The method of claim 2,

   Acquiring the period information,

   Obtaining the period information from preset information; or,

   And receiving one of the period information through higher layer signaling.
4. The method of claim 2,

   Acquiring the index order information,

   Obtaining the index order information on the SSB index order transmitted during the SSB transmission interval for each period from preset information;

   Receiving the index order information on the SSB index order transmitted during the SSB transmission interval for each period through higher layer signaling;

   Obtaining the index order information on the SSB index order transmitted during the SSB transmission interval for each period, based on identification information of a cell connected to the terminal; or,

   Acquiring the index order information on the SSB index order transmitted during the SSB transmission period for each period based on the identification information of the slot associated with the SSB transmission period; operation of the terminal in the unlicensed band Way.
5. The method of claim 1,

   The SSB received during the first SSB transmission interval based on the information,

   Method of operation of a terminal in an unlicensed band, which is different from SSB for initial access.
6. The method of claim 5,

   The SSB received during the first SSB transmission interval based on the information,

   Method of operation of the terminal in the unlicensed band, which is transmitted in a different resource than the SSB for the initial access.
7. The method of claim 1,

   The SSB received during the first SSB transmission interval based on the information,

   A method for operating a terminal in an unlicensed band corresponding to SSB based on numerology including 15 kHz subcarrier spacing.
8. The method of claim 1,

   The first SSB transmission interval,

   A first time interval for transmission of one or more SSBs based on the SSB index order transmitted during the first SSB transmission interval; And

   And a second time interval for transmitting an additional SSB corresponding to an SSB index not transmitted during the first time interval.
9. The method of claim 8,

   The first time interval is preceded in the time domain than the second time interval, the operation method of the terminal in the unlicensed band.
10. The method of claim 8,

    Performing reception of the SSB corresponding to the at least one SSB index during the first SSB transmission interval on the unlicensed band,

    During the first time interval, perform monitoring for one or more first SSBs based on the SSB index order transmitted during the first SSB transmission interval; And

    If there is an SSB index not received during the first time interval among all SSB indexes, performing additional monitoring for an additional SSB corresponding to the SSB index not received during the first time interval during the second time interval. A method of operating a terminal in an unlicensed band, including.
11. The method of claim 8,

    Based on the one or more first SSB indices associated with the SSB received during the first time interval:

    During the time interval for the transmission of the additional SSB corresponding to the first SSB index in the second time interval,

    (i) monitoring a physical downlink control channel (PDSCH) signal or a physical downlink shared channel (PDSCH) signal on the unlicensed band, or

    (ii) performing transmission of a physical uplink control channel (PUCCH) signal or a physical uplink shared channel (PUSCH) signal on the unlicensed band based on a channel access procedure (CAP) for the unlicensed band. Method of operation of the terminal in the unlicensed band.
12. A method of operating a base station in a wireless communication system supporting an unlicensed band,

    Acquiring information about the SSB index order transmitted during the first SSB transmission period in a specific period based on a change of the synchronization signal block (SSB) index order transmitted in the synchronization signal block (SSB) transmission period according to a predetermined period; And

    Based on the information, performing the transmission of the SSB corresponding to one or more SSB indexes using a channel access procedure (CAP) during the first SSB transmission interval on the unlicensed band, operation of the base station in the unlicensed band Way.
13. The method of claim 12,

    The first SSB transmission interval,

    A first time interval for transmission of one or more SSBs based on the SSB index order transmitted during the first SSB transmission interval; And

    And a second time interval for transmission of an additional SSB corresponding to an SSB index not transmitted during the first time interval.
14. The method of claim 13,

    Performing transmission of the SSB corresponding to the one or more SSB indexes using the CAP during the first SSB transmission period on the unlicensed band,

    Performing transmission of an SSB corresponding to at least one first SSB index on the unlicensed band based on the SSB index order transmitted during the first SSB transmission interval and the CAP for each SSB during the first time interval; And

    If there is a second SSB index not transmitted during the first time interval among all SSB indexes, transmission of an additional SSB corresponding to the second SSB index through the unlicensed band using the CAP during the second time interval. Operating a base station in an unlicensed band.
15. A terminal operating in a wireless communication system supporting an unlicensed band,

    At least one radio frequency (RF) module;

    At least one processor; And

    At least one memory operatively coupled to the at least one processor, the at least one memory storing instructions that when executed cause the at least one processor to perform a particular operation;

    The specific action is:

    Acquiring information on the SSB index order transmitted during the first SSB transmission period in a specific period based on a change of the synchronization signal block (SSB) index order transmitted in the synchronization signal block (SSB) transmission period according to a predetermined period; And

    Based on the information, controlling the at least one RF module to perform reception of an SSB corresponding to at least one SSB index during the first SSB transmission interval on the unlicensed band.
16. The method of claim 15,

    And the terminal communicates with at least one of a mobile terminal, a network, and an autonomous vehicle other than the vehicle in which the terminal is included.
17. A base station operating in a wireless communication system supporting an unlicensed band,

    At least one radio frequency (RF) module;

    At least one processor; And

    At least one memory operatively coupled to the at least one processor, the at least one memory storing instructions that, when executed, cause the at least one processor to perform a particular operation;

    The specific action is:

    Acquiring information about the SSB index order transmitted during the first SSB transmission period in a specific period based on a change of the synchronization signal block (SSB) index order transmitted in the synchronization signal block (SSB) transmission period according to a predetermined period; And

    Based on the information, controlling the at least one RF module to perform transmission of an SSB corresponding to one or more SSB indexes using a channel access procedure (CAP) during the first SSB transmission interval on the unlicensed band. Base station.

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