WO2020091580A1 - Method for determining dmrs location on physical shared channel resources in wireless communication system, and device for same - Google Patents

Abstract

The present specification provides a method for determining the location of a DMRS on physical shared channel resources for data transmission in a wireless communication system. More specifically, in the method, implemented by a terminal, format information on a slot for the transmission of first data and second data is received from a base station, the first data and the second data is transmitted, on the basis of the slot format information, using a first physical shared channel group comprising a plurality of first physical shared channels and a second physical shared channel group comprising a plurality of second physical shared channels, respectively, at which point a first DMRS and a second DMRS are mapped to the first physical shared channel group and the second physical shared channel group, respectively.

Description

Method and apparatus for determining DMRS location on physical shared channel resource in wireless communication system

The present specification relates to a wireless communication system, and relates to a DMRS location determination method on a physical shared channel resource and an apparatus supporting the same.

 Mobile communication systems have been developed to provide voice services while ensuring user mobility. However, the mobile communication system has expanded not only to voice but also to data services, and now, due to the explosive increase in traffic, a shortage of resources is caused and users demand higher speed services, so a more advanced mobile communication system is required. .

The requirements of the next-generation mobile communication system are to support the explosive data traffic, the dramatic increase in the transmission rate per user, the largely increased number of connected devices, the very low end-to-end latency, and high energy efficiency. It should be possible. To this end, dual connectivity, Massive Multiple Input Multiple Output (MIMO), In-band Full Duplex, Non-Orthogonal Multiple Access (NOMA), and Super Wideband Various technologies such as wideband support and device networking have been studied.

The purpose of this specification is to provide a method for transmitting data on a physical shared channel.

In addition, this specification has an object to provide a method for locating a Demodulation Reference Signal (DMRS) on a physical shared channel.

In addition, an object of the present disclosure is to provide a method of locating a DMRS on a physical shared channel that repeatedly transmits data on one slot.

In addition, this specification has an object to provide a method for locating a DMRS on a physical shared channel resource when the physical shared channel is discontinuous in the time domain.

The technical problems to be achieved in the present invention are not limited to the technical problems mentioned above, and other technical problems that are not mentioned will be clearly understood by those skilled in the art from the following description. Will be able to.

This specification provides a method for determining a location of a dedicated demodulation-reference signal (DMRS) on a physical shared channel for data transmission in a wireless communication system.

Specifically, the method performed by the terminal, receiving the format information of the slot for transmitting the first data and the second data from the base station, the format information of the slot, the first data and the second data Receiving configuration information including information about a plurality of symbols that can be transmitted and mapping information from the base station; And a first physical shared channel group composed of a plurality of first physical shared channels and a second physical shared channel group composed of a plurality of second physical shared channels, based on the slot format information. Transmitting the first data and the second data; Each of the plurality of first physical shared channels and the plurality of second physical shared channels is continuous in a time domain, and the first physical shared channel group and the second physical shared channel group are discontinuous in each time domain. , A first DMRS and a second DMRS are respectively mapped to the first physical shared channel group and the second physical shared channel group using the mapping information, and the mapping information constitutes the first physical shared channel group Information for mapping a third DMRS for a third physical shared channel consisting of the same number of symbols as the number of symbols to be made, and a symbol consisting of the same number of symbols as the number of symbols constituting the second physical shared channel group It characterized in that it includes information for mapping the fourth DMRS for the 4 physical shared channel.

In addition, in the present specification, the first data and the second data are characterized in that they are transmitted on one slot.

In addition, in the present specification, the format information of the slot is characterized in that it is scheduled semi-statically (semi-static).

In addition, in this specification, the mapping information is characterized in that the information based on the Redundancy Version (RV).

In addition, in the present specification, when the first data and the second data are transmitted on a plurality of slots, the mapping information is located at a location of a specific slot to which the first DMRS and the second DMRS are mapped. It is characterized by including information about.

In addition, in the present specification, different precoders and beams are applied to the first data and the second data.

In addition, in the present specification, the mapping information is characterized by including information on the location of a specific symbol to which the first DMRS and the second DMRS are mapped.

In addition, in the present specification, a terminal performing a method for determining a location of a DMRS (dedicated demodulation-reference signal) on a physical shared channel for data transmission in a wireless communication system, a transceiver for transmitting and receiving a wireless signal (transceiver); And a processor functionally connected to the transceiver, wherein the processor receives format information of a slot for transmitting first data and second data from a base station, and the format information of the slot includes the first data. And information on a plurality of symbols capable of transmitting the second data, receiving configuration information including mapping information from the base station, and, based on the format information of the slot, to the base station. The first data and the second data are transmitted by using a first physical shared channel group composed of a plurality of first physical shared channels and a second physical shared channel group composed of a plurality of second physical shared channels, Each of the plurality of first physical shared channels and the plurality of second physical shared channels is a time domain In the continuous, the first physical shared channel group and the second physical shared channel group are respectively discontinuous in the time domain, and the mapping information is used for each of the first physical shared channel group and the second physical shared channel group. The first DMRS and the second DMRS are respectively mapped, and the mapping information maps a third DMRS for a third physical shared channel composed of the same number of symbols constituting the first physical shared channel group. And information for mapping a fourth DMRS for a fourth physical shared channel composed of symbols equal to the number of symbols constituting the second physical shared channel group.

In addition, in the present specification, the first data and the second data are characterized in that they are transmitted on one slot.

In addition, in the present specification, the format information of the slot is characterized in that it is scheduled semi-statically (semi-static).

In addition, in this specification, the mapping information is characterized in that the information based on the Redundancy Version (RV).

In addition, in the present specification, when the first data and the second data are transmitted on a plurality of slots, the mapping information is located at a location of a specific slot to which the first DMRS and the second DMRS are mapped. It is characterized by including information about.

In addition, in the present specification, different precoders and beams are applied to the first physical shared channel group and the second physical shared channel group.

In addition, in the present specification, different precoders and beams are applied to the first data and the second data.

In addition, in the present specification, in a method for determining a location of a DMRS (dedicated demodulation-reference signal) on a physical shared channel for data transmission in a wireless communication system, a method performed by a base station includes: Transmitting the format information of the slot for transmitting the second data, the format information of the slot includes information on a plurality of symbols capable of transmitting the first data and the second data, and to the terminal, Transmitting configuration information including mapping information; And from the terminal, using a first physical shared channel group composed of a plurality of first physical shared channels and a second physical shared channel group composed of a plurality of second physical shared channels based on the format information of the slot. Receiving the transmitted first uplink data and the second uplink data; Each of the plurality of first physical shared channels and the plurality of second physical shared channels is continuous in a time domain, and the first physical shared channel group and the second physical shared channel group are discontinuous in each time domain. , A first DMRS and a second DMRS are respectively mapped to the first physical shared channel group and the second physical shared channel group using the mapping information, and the mapping information constitutes the first physical shared channel group Information for mapping a third DMRS for a third physical shared channel consisting of the same number of symbols as the number of symbols to be made, and a symbol consisting of the same number of symbols as the number of symbols constituting the second physical shared channel group. It characterized in that it includes information for mapping the fourth DMRS for the 4 physical shared channel.

This specification has an effect that the DMRS can be efficiently located on a physical shared channel resource for data transmission repeatedly transmitted on one slot.

In addition, the present specification provides a method of locating the DMRS on a discontinuous physical shared channel for transmitting data, and has an effect of efficiently decoding data.

In addition, the present specification has an effect that the transmission reliability can be improved by providing a method of using different precoders and beams in a physical shared channel for transmitting data.

The effects obtainable in the present invention are not limited to the above-mentioned effects, and other effects not mentioned will be clearly understood by those skilled in the art from the following description. .

Included as part of the detailed description to aid understanding of the present invention, the accompanying drawings provide embodiments of the present invention and describe the technical features of the present invention together with the detailed description.

1 is a diagram showing an example of a 5G scenario proposed in this specification.

2 is a diagram illustrating an AI device to which the method proposed in the present specification can be applied.

3 is a diagram showing an AI server to which the method proposed in this specification can be applied.

4 is a diagram showing an AI system to which the method proposed in the present specification can be applied.

5 is an example of a wireless communication system to which the methods proposed herein can be applied.

6 is an example of a wireless device to which the methods proposed herein can be applied.

7 is an example of a signal processing circuit for a transmission signal to which the methods proposed in this specification can be applied.

8 is another example of a wireless device to which the methods proposed herein can be applied.

9 is an example of a mobile device to which the methods proposed in this specification can be applied.

10 is a view showing an example of the overall system structure of the NR to which the method proposed in this specification can be applied.

11 shows a relationship between an uplink frame and a downlink frame in a wireless communication system to which the method proposed in this specification can be applied.

12 shows an example of a resource grid supported by a wireless communication system to which the method proposed in this specification can be applied.

13 shows examples of an antenna port and a resource grid for each neurology to which the method proposed in this specification can be applied.

14 is a diagram showing an example of a self-contained slot structure to which the method proposed in the present specification can be applied.

15 illustrates the SSB structure.

16 illustrates SSB transmission.

17 illustrates that a terminal acquires information on DL time synchronization.

18 illustrates a system information (SI) acquisition process.

19 illustrates an example of a random access procedure.

20 shows a concept of a threshold value for an SS block for RACH resource association.

21 is a diagram for explaining a power ramping counter of a PRACH.

22 shows an example of a parity check matrix.

23 shows an example of a parity check matrix based on a 4ｘ4 cyclic permutation matrix.

Fig. 24 shows the encoder structure for the polar code.

25 shows an example of channel combining and channel separation of a polar code.

26 is a diagram illustrating an example of transmitting a PUCCH including HARQ-ACK feedback in one slot proposed in this specification.

27 is a flowchart illustrating a terminal operation method for performing a DMRS location determination method on a physical shared channel proposed in this specification.

28 is a flowchart illustrating a method of operating a base station performing a DMRS location determination method on a physical shared channel proposed in this specification.

Hereinafter, preferred embodiments according to the present invention will be described in detail with reference to the accompanying drawings. DETAILED DESCRIPTION The detailed description set forth below, in conjunction with the accompanying drawings, is intended to describe exemplary embodiments of the invention, and is not intended to represent the only embodiments in which the invention may be practiced. The following detailed description includes specific details to provide a thorough understanding of the present invention. However, one skilled in the art knows that the present invention can be practiced without these specific details.

In some cases, in order to avoid obscuring the concept of the present invention, well-known structures and devices may be omitted, or block diagrams centered on the core functions of each structure and device may be illustrated.

In this specification (disclosure), the base station has a meaning as a terminal node of a network that directly communicates with a terminal. Certain operations described in this document as being performed by a base station may be performed by an upper node of the base station in some cases. That is, it is apparent that various operations performed for communication with a terminal in a network composed of a plurality of network nodes including a base station can be performed by a base station or other network nodes other than the base station. 'Base station (BS)' is a term such as a fixed station (fixed station), Node B, evolved-NodeB (eNB), base transceiver system (BTS), access point (AP), general NB (gNB), etc. Can be replaced by In addition, the 'terminal (Terminal)' may be fixed or mobile, UE (User Equipment), MS (Mobile Station), UT (user terminal), MSS (Mobile Subscriber Station), SS (Subscriber Station), AMS ( It can be replaced with terms such as Advanced Mobile Station (WT), Wireless terminal (WT), Machine-Type Communication (MTC) device, Machine-to-Machine (M2M) device, and Device-to-Device (D2D) device.

Hereinafter, downlink (DL) means communication from a base station to a terminal, and uplink (UL) means communication from a terminal to a base station. In the downlink, the transmitter may be part of the base station, and the receiver may be part of the terminal. In the uplink, the transmitter may be part of the terminal, and the receiver may be part of the base station.

Certain terms used in the following description are provided to help understanding of the present invention, and the use of these specific terms may be changed to other forms without departing from the technical spirit of the present invention.

The following technologies are 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 NOMA. (non-orthogonal multiple access), and the like. CDMA may be implemented by radio technology such as universal terrestrial radio access (UTRA) or CDMA2000. TDMA may be implemented with radio 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 with wireless technologies such as IEEE 802.11 (Wi-Fi), IEEE 802.16 (WiMAX), IEEE 802-20, and evolved UTRA (E-UTRA). UTRA is part of a universal mobile telecommunications system (UMTS). The 3rd generation partnership project (3GPP) long term evolution (LTE) is part of evolved UMTS (E-UMTS) using E-UTRA, and adopts OFDMA in the downlink and SC-FDMA in the uplink. LTE-A (advanced) is an evolution of 3GPP LTE.

5G NR (new radio) defines eMBB (enhanced Mobile Broadband), mMTC (massive Machine Type Communications), URLLC (Ultra-Reliable and Low Latency Communications), V2X (vehicle-to-everything) according to usage scenario.

In addition, the 5G NR standard is divided into standalone (SA) and non-standalone (NSA) according to co-existence between the NR system and the LTE system.

In addition, 5G NR supports various subcarrier spacings, CP-OFDM in the downlink, and CP-OFDM and DFT-s-OFDM (SC-OFDM) in the uplink.

Embodiments of the present invention may be supported by standard documents disclosed in at least one of the wireless access systems IEEE 802, 3GPP and 3GPP2. That is, steps or parts that are not described in order to clearly reveal the technical idea of the present invention among the embodiments of the present invention may be supported by the documents. Also, all terms disclosed in this document may be described by the standard document.

For clarity, 3GPP LTE / LTE-A / NR (New Radio) is mainly described, but the technical features of the present invention are not limited thereto.

Also, in this specification, 'A and / or B' may be interpreted as having the same meaning as 'including at least one of A or B'.

Hereinafter, an example of 5G usage scenarios to which the method proposed in this specification can be applied will be described.

1 is a diagram showing an example of a 5G scenario proposed in this specification.

The three main requirements areas of 5G are: (1) Enhanced Mobile Broadband (eMBB) area, (2) Massive Machine Type Communication (mMTC) area, and (3) Super-reliability and Ultra-reliable and Low Latency Communications (URLLC) domain.

Some use cases may require multiple areas for optimization, and other use cases may focus on only one key performance indicator (KPI). 5G is a flexible and reliable way to support these various use cases.

eMBB goes far beyond basic mobile Internet access, and covers media and entertainment applications in rich interactive work, cloud or augmented reality. Data is one of the key drivers of 5G, and it may not be possible to see dedicated voice services for the first time in the 5G era. In 5G, it is expected that voice will be processed as an application program simply using the data connection provided by the communication system. The main causes for increased traffic volume are increased content size and increased number of applications requiring high data rates. Streaming services (audio and video), interactive video and mobile internet connections will become more widely used as more devices connect to the internet. Many of these applications require always-on connectivity to push real-time information and notifications to users. Cloud storage and applications are rapidly increasing in mobile communication platforms, which can be applied to both work and entertainment. And, cloud storage is a special use case that drives the growth of uplink data transfer rate. 5G is also used for remote work in the cloud, requiring much lower end-to-end delay to maintain a good user experience when a tactile interface is used. Entertainment For example, cloud gaming and video streaming are another key factor in increasing demand for mobile broadband capabilities. Entertainment is essential for smartphones and tablets anywhere, including high mobility environments such as trains, cars and airplanes. Another use case is augmented reality and information retrieval for entertainment. Here, augmented reality requires very low delay and instantaneous amount of data.

In addition, one of the most anticipated 5G use cases is the ability to seamlessly connect embedded sensors in all fields, namely mMTC. It is predicted that by 2020, there will be 20.4 billion potential IoT devices. Industrial IoT is one of the areas where 5G plays a key role in enabling smart cities, asset tracking, smart utilities, agriculture and security infrastructure.

URLLC includes new services that will transform the industry through ultra-reliable / low-latency links, such as remote control of the main infrastructure and self-driving vehicles. Reliability and level of delay are essential for smart grid control, industrial automation, robotics, drone control and coordination.

Next, a number of use cases will be described in more detail.

5G can complement fiber-to-the-home (FTTH) and cable-based broadband (or DOCSIS) as a means to provide streams rated at hundreds of megabits per second to gigabit per second. This fast speed is required to deliver TV in 4K (6K, 8K and higher) resolutions as well as virtual and augmented reality. Virtual Reality (VR) and Augmented Reality (AR) applications include almost immersive sports events. Certain application programs may require special network settings. For VR games, for example, game companies may need to integrate the core server with the network operator's edge network server to minimize latency.

Automotive is expected to be an important new driver for 5G, along with many use cases for mobile communications to vehicles. For example, entertainment for passengers requires simultaneous high capacity and high mobility mobile broadband. This is because future users continue to expect high-quality connections regardless of their location and speed. Another example of application in the automotive field is the augmented reality dashboard. It identifies objects in the dark over what the driver sees through the front window, and superimposes and displays information telling the driver about the distance and movement of the object. In the future, wireless modules will enable communication between vehicles, exchange of information between the vehicle and the supporting infrastructure and exchange of information between the vehicle and other connected devices (eg, devices carried by pedestrians). The safety system helps the driver to reduce the risk of accidents by guiding alternative courses of action to make driving safer. The next step will be remote control or a self-driven vehicle. This requires very reliable and very fast communication between different self-driving vehicles and between the vehicle and the infrastructure. In the future, self-driving vehicles will perform all driving activities, and drivers will focus only on traffic beyond which the vehicle itself cannot identify. The technical requirements of self-driving vehicles require ultra-low delays and ultra-high-speed reliability to increase traffic safety to levels beyond human reach.

Smart cities and smart homes, referred to as smart societies, will be embedded in high-density wireless sensor networks. The distributed network of intelligent sensors will identify the conditions for cost and energy-efficient maintenance of the city or home. Similar settings can be made for each assumption. Temperature sensors, window and heating controllers, burglar alarms and consumer electronics are all connected wirelessly. Many of these sensors are typically low data rates, low power and low cost. However, for example, real-time HD video may be required in certain types of devices for surveillance.

The consumption and distribution of energy, including heat or gas, is highly decentralized, requiring automated control of a distributed sensor network. The smart grid interconnects these sensors using digital information and communication technologies to collect information and act accordingly. This information can include supplier and consumer behavior, so smart grids can improve efficiency, reliability, economics, production sustainability and distribution of fuels like electricity in an automated way. The smart grid can be viewed as another sensor network with low latency.

The health sector has many applications that can benefit from mobile communications. The communication system can support telemedicine that provides clinical care from a distance. This can help reduce barriers to distance and improve access to medical services that are not continuously available in remote rural areas. It is also used to save lives in critical care and emergency situations. A wireless sensor network based on mobile communication can provide remote monitoring and sensors for parameters such as heart rate and blood pressure.

Wireless and mobile communications are becoming increasingly important in industrial applications. Wiring is expensive to install and maintain. Thus, the possibility of replacing cables with wireless links that can be reconfigured is an attractive opportunity in many industries. However, achieving this requires that the wireless connection operates with cable-like delay, reliability and capacity, and that management is simplified. Low latency and very low error probability are new requirements that need to be connected to 5G.

Logistics and freight tracking are important use cases for mobile communications that enable the tracking of inventory and packages from anywhere using location-based information systems. Logistics and freight tracking use cases typically require low data rates, but require wide range and reliable location information.

Artificial Intelligence (AI)

Artificial intelligence refers to the field of studying artificial intelligence or a methodology to create it, and machine learning (machine learning) refers to the field of studying the methodology to define and solve various problems in the field of artificial intelligence. do. Machine learning is defined as an algorithm that improves the performance of a job through steady experience.

An artificial neural network (ANN) is a model used in machine learning, and may mean an overall model having a problem-solving ability, composed of artificial neurons (nodes) forming a network through a combination of synapses. The artificial neural network may be defined by a connection pattern between neurons of different layers, a learning process for updating model parameters, and an activation function that generates output values.

The artificial neural network may include an input layer, an output layer, and optionally one or more hidden layers. Each layer contains one or more neurons, and the artificial neural network can include neurons and synapses connecting neurons. In an artificial neural network, each neuron may output a function value of an input function input through a synapse, a weight, and an active function for bias.

The model parameter means a parameter determined through learning, and includes weights of synaptic connections and bias of neurons. In addition, the hyperparameter means a parameter that must be set before learning in a machine learning algorithm, and includes learning rate, number of iterations, mini-batch size, initialization function, and the like.

The purpose of training an artificial neural network can be seen as determining model parameters that minimize the loss function. The loss function can be used as an index for determining an optimal model parameter in the learning process of an artificial neural network.

Machine learning can be classified into supervised learning, unsupervised learning, and reinforcement learning according to the learning method.

Supervised learning refers to a method of training an artificial neural network while a label for training data is given, and a label is a correct answer (or a result value) that the artificial neural network must infer when the training data is input to the artificial neural network. Can mean Unsupervised learning may refer to a method of training an artificial neural network without a label for learning data. Reinforcement learning may mean a learning method in which an agent defined in a certain environment is trained to select an action or a sequence of actions to maximize cumulative reward in each state.

Machine learning implemented as a deep neural network (DNN) that includes a plurality of hidden layers among artificial neural networks is also referred to as deep learning (deep learning), and deep learning 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 acts on a task given by its own capabilities. In particular, a robot having a function of recognizing the environment and performing an operation by determining itself can be referred to as an intelligent robot.

Robots can be classified into industrial, medical, household, and military according to the purpose or field of use.

The robot may be provided with 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, so that it can travel on the ground or fly in the air through the driving unit.

Self-Driving, Autonomous-Driving

Autonomous driving refers to the technology of driving on its own, and autonomous driving means a vehicle that operates without a user's manipulation or with a minimum manipulation of the user.

For example, in autonomous driving, a technology that maintains a driving lane, a technology that automatically adjusts speed such as adaptive cruise control, a technology that automatically drives along a predetermined route, and a technology that automatically sets a route when a destination is set, etc. All of this can be included.

The vehicle includes a vehicle having only an internal combustion engine, a hybrid vehicle having both an internal combustion engine and an electric motor, and an electric vehicle having only an electric motor, and may include a train, a motorcycle, etc. as well as a vehicle.

At this time, the autonomous vehicle can be viewed as a robot having an autonomous driving function.

EXtended Reality (XR)

Augmented reality refers to virtual reality (VR), augmented reality (AR), and mixed reality (MR). VR technology provides real-world objects or backgrounds only as CG images, AR technology provides CG images made virtually on real objects, and MR technology is a computer that mixes and combines virtual objects in the real world. Graphics technology.

MR technology is similar to AR technology in that it shows both real and virtual objects. However, in AR technology, a virtual object is used as a complement to a real object, whereas in MR technology, there is a difference in that a virtual object and a real object are used with equal characteristics.

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

2 shows an AI device 100 according to an embodiment of the present invention.

The AI device 100 is a TV, projector, mobile phone, smartphone, desktop computer, laptop, digital broadcasting terminal, PDA (personal digital assistants), PMP (portable multimedia player), navigation, tablet PC, wearable device, set-top box (STB) ), DMB receivers, radios, washing machines, refrigerators, desktop computers, digital signage, robots, vehicles, and the like.

Referring to FIG. 2, 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, etc. It can contain.

The communication unit 110 may transmit and receive data to and from external devices such as other AI devices 100a to 100e or the AI server 200 using wired / wireless communication technology. For example, the communication unit 110 may transmit and receive sensor information, a user input, a learning model, a control signal, etc. with external devices.

At this time, the communication technology used by the communication unit 110 includes Global System for Mobile Communication (GSM), Code Division Multi Access (CDMA), Long Term Evolution (LTE), 5G, Wireless LAN (WLAN), Wireless-Fidelity (Wi-Fi). ), Bluetooth (Radio Frequency Identification), RFID (Infrared Data Association; IrDA), ZigBee, Near Field Communication (NFC).

The input unit 120 may acquire various types of data.

At this time, the input unit 120 may include a camera for inputting a video signal, a microphone for receiving an audio signal, a user input unit for receiving information from a user, and the like. Here, the camera or microphone is treated as a sensor, and the signal obtained from the camera or microphone may be referred to as sensing data or sensor information.

The input unit 120 may acquire training data for model training and input data to be used when obtaining an output using the training model. The input unit 120 may obtain raw input data. In this case, the processor 180 or the learning processor 130 may extract input features as pre-processing of the input data.

The learning processor 130 may train a model composed of artificial neural networks using the training data. Here, the trained artificial neural network may be referred to as a learning model. The learning model can be used to infer a result value for new input data rather than learning data, and the inferred value can be used as a basis for determining to perform an action.

At this time, the learning processor 130 may perform AI processing together with the learning processor 240 of the AI server 200.

At this time, the learning processor 130 may include a memory integrated or implemented in the AI device 100. Alternatively, the learning processor 130 may be implemented using memory 170, external memory directly coupled to the AI device 100, or memory maintained in the external device.

The sensing unit 140 may acquire at least one of AI device 100 internal information, AI device 100 environment information, and user information using various sensors.

At this time, the sensors included in the sensing unit 140 include a proximity sensor, an illuminance sensor, an acceleration sensor, a magnetic sensor, a gyro sensor, an inertial sensor, an RGB sensor, an IR sensor, a fingerprint recognition sensor, an ultrasonic sensor, an optical sensor, a microphone, and a lidar. , And radar.

The output unit 150 may generate output related to vision, hearing, or tactile sense.

At this time, the output unit 150 may include a display unit for outputting visual information, a speaker for outputting auditory information, a haptic module for outputting tactile information, and the like.

The memory 170 may store data supporting various functions of the AI device 100. For example, the memory 170 may store input data, learning data, learning models, learning history, etc. acquired by the input unit 120.

The processor 180 may determine at least one executable action of the AI device 100 based on information determined or generated using a data analysis algorithm or a machine learning algorithm. Also, the processor 180 may control components of the AI device 100 to perform a determined operation.

To this end, the processor 180 may request, search, receive, or utilize data of the learning processor 130 or the memory 170, and perform an operation that is predicted or determined to be preferable among the at least one executable operation. It is possible to control the components of the AI device 100 to execute.

At this time, 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 when it is necessary to link the external device to perform the determined operation.

The processor 180 may acquire intention information for a user input, and determine a user's requirement based on the obtained intention information.

At this time, the processor 180 uses at least one of a Speech To Text (STT) engine for converting voice input into a string or a Natural Language Processing (NLP) engine for acquiring intention information of natural language, and a user Intention information corresponding to an input may be obtained.

At this time, at least one of the STT engine or the NLP engine may be configured as an artificial neural network at least partially learned according to a machine learning algorithm. And, at least one or more of the STT engine or the NLP engine is learned by the learning processor 130, learned by the learning processor 240 of the AI server 200, or learned by distributed processing thereof May be

The processor 180 collects history information including the user's feedback on the operation content or operation of the AI device 100 and stores it in the memory 170 or the running processor 130, or the AI server 200, etc. Can be sent to external devices. The collected history 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. Furthermore, the processor 180 may operate by combining two or more of the components included in the AI device 100 with each other to drive the application program.

3 shows an AI server 200 according to an embodiment of the present invention.

Referring to FIG. 3, the AI server 200 may refer to an apparatus for learning an artificial neural network using a machine learning algorithm or using a trained 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. At this time, the AI server 200 is included as a configuration of a part of the AI device 100, and may perform at least a part of AI processing together.

The AI server 200 may include a communication unit 210, a memory 230, a running processor 240 and a processor 260.

The communication unit 210 may transmit and 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 (or artificial neural network, 231a) being trained or trained through the learning processor 240.

The learning processor 240 may train the artificial neural network 231a using learning data. The learning model may be used while being mounted on the AI server 200 of the artificial neural network, or may be mounted and used on 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 part 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 the result value for the new input data using the learning model, and generate a response or control command based on the inferred result value.

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

Referring to FIG. 4, the AI system 1 includes 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. It is connected to the cloud network 10. Here, the robot 100a to which 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 AI devices 100a to 100e.

The cloud network 10 may form a part of the cloud computing infrastructure or may mean a network existing in the cloud computing infrastructure. Here, the cloud network 10 may be configured using a 3G network, a 4G or a Long Term Evolution (LTE) network, or a 5G network.

That is, each device (100a to 100e, 200) constituting the AI system 1 may be connected to each other through the cloud network (10). In particular, the devices 100a to 100e and 200 may communicate with each other through a base station, but may communicate with each other directly without passing through the base station.

The AI server 200 may include a server performing AI processing and a server performing operations on big data.

The AI server 200 includes at least one or more among robots 100a, autonomous vehicles 100b, XR devices 100c, smart phones 100d, or home appliances 100e, which are AI devices constituting the AI system 1. It is connected through the cloud network 10 and can assist at least some of the AI processing of the connected AI devices 100a to 100e.

At this time, the AI server 200 may train the artificial neural network according to the machine learning algorithm in place of the AI devices 100a to 100e, and may directly store the learning model or transmit it to the AI devices 100a to 100e.

At this time, the AI server 200 receives input data from the AI devices 100a to 100e, infers a result value to the received input data using a learning model, and issues a response or control command based on the inferred result value. It can be generated and transmitted to AI devices 100a to 100e.

Alternatively, the AI devices 100a to 100e may infer a result value with respect to 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. 4 may be viewed as specific embodiments of the AI device 100 illustrated in FIG. 2.

AI + robot

AI technology is applied to the robot 100a, and may be implemented as a guide robot, a transport robot, a cleaning robot, a wearable robot, an entertainment robot, a pet robot, and an unmanned flying robot.

The robot 100a may include a robot control module for controlling an operation, and the robot control module may mean a software module or a chip implemented with hardware.

The robot 100a acquires state information of the robot 100a using sensor information obtained from various types of sensors, detects (recognizes) surrounding environment and objects, generates map data, or moves and travels. You can decide on a plan, determine a response to user interaction, or determine an action.

Here, the robot 100a may use sensor information acquired from at least one sensor among a lidar, a radar, and a camera in order to determine a movement route and a driving plan.

The robot 100a may perform the above operations 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 may determine an operation using the recognized surrounding environment information or object information. Here, the learning model may be directly learned from the robot 100a or may be learned from an external device such as the AI server 200.

At this time, 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. You may.

The robot 100a determines a moving path and a driving plan using at least one of map data, object information detected from sensor information, or object information obtained from an external device, and controls the driving unit to determine the determined moving path and driving plan. Accordingly, the robot 100a can be driven.

The map data may include object identification information for various objects arranged in a space in which the robot 100a moves. For example, the map data may include object identification information for fixed objects such as walls and doors and movable objects such as flower pots and desks. In addition, the object identification information may include a name, type, distance, and location.

In addition, the robot 100a may perform an operation or travel by controlling a driving unit based on a user's control / interaction. At this time, the robot 100a may acquire intention information of an interaction according to a user's motion or voice utterance, and determine an answer based on the obtained intention information to perform an operation.

AI + autonomous driving

The autonomous driving vehicle 100b is applied with AI technology and can be implemented as a mobile robot, a vehicle, or an unmanned aerial vehicle.

The autonomous driving vehicle 100b may include an autonomous driving control module for controlling an autonomous driving function, and the autonomous driving control module may refer to a software module or a chip implemented with hardware. The autonomous driving control module may be included therein as a configuration of the autonomous driving vehicle 100b, but may be configured and connected to a separate hardware outside the autonomous driving vehicle 100b.

The autonomous vehicle 100b acquires state information of the autonomous vehicle 100b using sensor information obtained from various types of sensors, detects (recognizes) surrounding objects and objects, generates map data, The route and driving plan may be determined, or an operation may be determined.

Here, the autonomous vehicle 100b may use sensor information obtained from at least one sensor among a lidar, a radar, and a camera, like the robot 100a, to determine a movement path and a driving plan.

In particular, the autonomous driving vehicle 100b may receive sensor information from external devices or recognize an environment or an object for an area where a field of view is obscured or a predetermined distance or more, or receive information recognized directly from external devices. .

The autonomous vehicle 100b may perform the above-described operations 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 may 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.

At this time, 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 generated result accordingly. You can also do

The autonomous vehicle 100b determines a moving path and a driving plan using at least one of map data, object information detected from sensor information, or object information obtained from an external device, and controls the driving unit to determine the moving path and driving According to the plan, the autonomous vehicle 100b may be driven.

The map data may include object identification information for various objects arranged in a space (for example, a road) in which the autonomous vehicle 100b travels. For example, the map data may include object identification information for fixed objects such as street lights, rocks, buildings, and movable objects such as vehicles and pedestrians. In addition, the object identification information may include a name, type, distance, and location.

In addition, the autonomous vehicle 100b may perform an operation or travel by controlling a driving unit based on a user's control / interaction. At this time, the autonomous driving vehicle 100b may acquire intention information of an interaction according to a user's motion or voice utterance, and determine an answer based on the obtained intention information to perform an operation.

AI + XR

AI technology is applied to the XR device 100c, HMD (Head-Mount Display), HUD (Head-Up Display) provided in a vehicle, television, mobile phone, smart phone, computer, wearable device, home appliance, digital signage , It can be implemented as a vehicle, a fixed robot or a mobile robot.

The XR device 100c generates location data and attribute data for 3D points by analyzing 3D point cloud data or image data obtained through various sensors or from an external device, thereby providing information about surrounding space or real objects. The XR object to be acquired and output can be rendered and output. For example, the XR device 100c may output an XR object including additional information about the recognized object in correspondence with the recognized object.

The XR device 100c may perform the above operations using a learning model composed of at least one artificial neural network. For example, the XR device 100c may recognize a real object from 3D point cloud data or image data using a learning model, and provide information corresponding to the recognized real object. Here, the learning model may be directly trained in the XR device 100c or may be learned in an external device such as the AI server 200.

At this time, 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 generated result accordingly. You can also do

AI + robot + autonomous driving

The robot 100a is applied with AI technology and autonomous driving technology, and can be implemented as a guide robot, a transport robot, a cleaning robot, a wearable robot, an entertainment robot, a pet robot, and an unmanned flying robot.

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

The robot 100a having an autonomous driving function may collectively refer to moving devices by moving itself or determining the moving line according to a given moving line without user control.

The robot 100a and the autonomous vehicle 100b having an autonomous driving function may use a common sensing method to determine one or more of a moving path or a driving plan. For example, the robot 100a and the autonomous vehicle 100b having an autonomous driving function may determine one or more of a moving route or a driving plan using information sensed through a lidar, a radar, and a camera.

The robot 100a interacting with the autonomous vehicle 100b exists separately from the autonomous vehicle 100b, and is connected to an autonomous vehicle function inside or outside the autonomous vehicle 100b, or the autonomous vehicle 100b ) Can perform the operation associated with the user on board.

At this time, the robot 100a that interacts with the autonomous vehicle 100b acquires sensor information on behalf of the autonomous vehicle 100b and provides it to the autonomous vehicle 100b, acquires sensor information, and obtains environment information or By generating object information and providing it to the autonomous vehicle 100b, it is possible to control or assist the autonomous vehicle driving function of the autonomous vehicle 100b.

Alternatively, the robot 100a interacting with the autonomous vehicle 100b may monitor a user on 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 a driving unit of the autonomous vehicle 100b. Here, the function of the autonomous driving vehicle 100b controlled by the robot 100a may include not only an autonomous driving function, but also a function provided by a navigation system or an audio system provided inside the autonomous driving vehicle 100b.

Alternatively, the robot 100a interacting with the autonomous vehicle 100b may provide information or assist a function to the autonomous vehicle 100b from 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 traffic light, or interact with the autonomous vehicle 100b, such as an automatic electric charger for an electric vehicle. An electric charger can also be automatically connected to the charging port.

AI + Robot + XR

The robot 100a is applied with AI technology and XR technology, and can 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, and a drone.

The robot 100a to which XR technology is applied may mean a robot that is a target of control / interaction within an XR image. In this case, the robot 100a is separated from the XR device 100c and can be interlocked with each other.

When the robot 100a, which is the object of control / interaction within the XR image, acquires sensor information from sensors including a camera, the robot 100a or the XR device 100c generates an XR image based on the sensor information. And, the XR device 100c may output the generated XR image. In addition, the robot 100a may operate based on a control signal input through the XR device 100c or a user's interaction.

For example, the user can check the XR image corresponding to the viewpoint of the robot 100a remotely linked through an external device such as the XR device 100c, and adjust the autonomous driving path of the robot 100a through interaction or , You can control the operation or driving, or check the information of the surrounding objects.

AI + Autonomous Driving + XR

The autonomous vehicle 100b is applied with AI technology and XR technology, and may be implemented as a mobile robot, a vehicle, or an unmanned aerial vehicle.

The autonomous driving vehicle 100b to which the XR technology is applied may mean an autonomous driving vehicle having a means for providing an XR image or an autonomous driving vehicle targeted for control / interaction within the XR image. In particular, the autonomous vehicle 100b, which is the object of control / interaction within the XR image, is distinguished from the XR device 100c and may be interlocked with each other.

The autonomous vehicle 100b having a 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 to the occupant by outputting an XR image with a HUD.

At this time, when the XR object is output to the HUD, at least a portion of the XR object may be output so as to overlap with an actual object facing the occupant's gaze. On the other hand, when the XR object is output to a display provided inside the autonomous vehicle 100b, at least a part of the XR object may be output to overlap with an object in the screen. For example, the autonomous vehicle 100b may output XR objects corresponding to objects such as lanes, other vehicles, traffic lights, traffic signs, two-wheeled vehicles, pedestrians, buildings, and the like.

When the autonomous vehicle 100b, which is the object of control / interaction within the XR image, acquires sensor information from sensors including a camera, the autonomous vehicle 100b or the XR device 100c is based on the sensor information. The XR image is generated, and the XR device 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 device 100c.

Example communication system to which the present invention is applied

Without being limited thereto, various descriptions, functions, procedures, suggestions, methods and / or operational flowcharts of the present invention disclosed in this document may be applied to various fields requiring wireless communication / connection (eg, 5G) between devices. have.

Hereinafter, with reference to the drawings will be illustrated in more detail. In the following drawings / description, the same reference numerals may exemplify the same or corresponding hardware blocks, software blocks, or functional blocks, unless otherwise indicated.

5 illustrates a communication system 10000 applied to the present invention.

Referring to FIG. 5, a communication system 10000 applied to the present invention includes a wireless device, a base station, and a network. Here, the wireless device means a device that performs communication using a wireless access technology (eg, 5G NR (New RAT), Long Term Evolution (LTE)), and may be referred to as a communication / wireless / 5G device. Although not limited to this, wireless devices include robots 10000a, vehicles 10000b-1, 10000b-2, XR (eXtended Reality) devices 10000c, hand-held devices 10000d, and home appliances 10000e ), Internet of Thing (IoT) device 10000f, AI device / server 40000. For example, the vehicle may include a vehicle equipped with a wireless communication function, an autonomous driving vehicle, a vehicle capable of performing inter-vehicle communication, and the like. Here, the vehicle may include a UAV (Unmanned Aerial Vehicle) (eg, a drone). XR devices include Augmented Reality (AR) / Virtual Reality (VR) / Mixed Reality (MR) devices, Head-Mounted Device (HMD), Head-Up Display (HUD) provided in vehicles, televisions, smartphones, It may be implemented in the form of a computer, wearable device, home appliance, digital signage, vehicle, robot, or the like. The mobile device may include a smart phone, a smart pad, a wearable device (eg, a smart watch, smart glasses), a computer (eg, a notebook, etc.). Household appliances may include a TV, a refrigerator, and a washing machine. IoT devices may include sensors, smart meters, and the like. For example, the base station and the network may also be implemented as wireless devices, and the specific wireless device 20000a may operate as a base station / network node to other wireless devices.

The wireless devices 10000a to 10000f may be connected to the network 30000 through the base station 20000. AI (Artificial Intelligence) technology may be applied to the wireless devices 10000a to 10000f, and the wireless devices 10000a to 10000f may be connected to the AI server 40000 through the network 30000. The network 30000 may be configured using a 3G network, a 4G (eg, LTE) network, or a 5G (eg, NR) network. The wireless devices 10000a to 10000f may communicate with each other through the base station 20000 / network 30000, but may also directly communicate (e.g. sidelink communication) without going through the base station / network. For example, vehicles 10000b-1 and 10000b-2 may communicate directly (e.g. Vehicle to Vehicle (V2V) / Vehicle to everything (V2X) communication). Also, the IoT device (eg, sensor) may directly communicate with other IoT devices (eg, sensors) or other wireless devices 10000a to 10000f.

Wireless communication / connection (15000a, 15000b, 15000c) may be achieved between the wireless devices 10000a to 10000f / base station 20000, base station 20000 / base station 20000. Here, the wireless communication / connection is various wireless access such as uplink / downlink communication (15000a) and sidelink communication (15000b) (or D2D communication), base station communication (15000c) (eg relay, Integrated Access Backhaul (IAB)) It can be achieved through technology (eg, 5G NR). Through wireless communication / connection (15000a, 15000b, 15000c), wireless devices and base stations / wireless devices, base stations and base stations can transmit / receive radio signals to each other. For example, the wireless communication / connection (15000a, 15000b, 15000c) may transmit / receive signals through various physical channels.To this end, based on various proposals of the present invention, for the transmission / reception of wireless signals At least some of various configuration information setting processes, various signal processing processes (eg, channel encoding / decoding, modulation / demodulation, resource mapping / demapping, etc.), resource allocation processes, and the like may be performed.

Examples of wireless devices to which the present invention can be applied

6 illustrates a wireless device that can be applied to the present invention.

Referring to FIG. 6, the first wireless device 610 and the second wireless device 620 may transmit and receive wireless signals through various wireless access technologies (eg, LTE and NR). Here, {the first wireless device 610, the second wireless device 620} is {wireless device (10000x), base station (20000)} and / or {wireless device (10000x), wireless device (10000x) in FIG. }.

The first wireless device 610 includes one or more processors 612 and one or more memories 614, and may further include one or more transceivers 616 and / or one or more antennas 618. The processor 612 controls the memory 614 and / or transceiver 616 and may be configured to implement the descriptions, functions, procedures, suggestions, methods and / or operational flowcharts disclosed herein. For example, the processor 612 may process information in the memory 614 to generate the first information / signal, and then transmit a wireless signal including the first information / signal through the transceiver 616. In addition, the processor 612 may receive the wireless signal including the second information / signal through the transceiver 616 and store the information obtained from the signal processing of the second information / signal in the memory 614. The memory 614 may be connected to the processor 612, and may store various information related to the operation of the processor 612. For example, the memory 614 is an instruction to perform some or all of the processes controlled by the processor 612, or to perform the descriptions, functions, procedures, suggestions, methods and / or operational flowcharts disclosed herein. You can store software code that includes Here, the processor 612 and the memory 614 may be part of a communication modem / circuit / chip designed to implement wireless communication technology (eg, LTE, NR). The transceiver 616 can be coupled to the processor 612 and can transmit and / or receive wireless signals through one or more antennas 618. The transceiver 616 may include a transmitter and / or receiver. The transceiver 616 may be mixed with a radio frequency (RF) unit. In the present invention, the wireless device may mean a communication modem / circuit / chip.

The second wireless device 620 includes one or more processors 622, one or more memories 624, and may further include one or more transceivers 626 and / or one or more antennas 628. Processor 622 controls memory 624 and / or transceiver 626 and may be configured to implement the descriptions, functions, procedures, suggestions, methods, and / or operational flowcharts disclosed herein. For example, the processor 622 may process the information in the memory 624 to generate the third information / signal, and then transmit the wireless signal including the third information / signal through the transceiver 626. In addition, the processor 622 may receive the wireless signal including the fourth information / signal through the transceiver 626 and store the information obtained from the signal processing of the fourth information / signal in the memory 624. The memory 624 may be connected to the processor 622 and may store various information related to the operation of the processor 622. For example, memory 624 may be used to perform some or all of the processes controlled by processor 622, or instructions to perform the descriptions, functions, procedures, suggestions, methods and / or operational flowcharts disclosed herein. You can store software code that includes Here, the processor 622 and the memory 624 may be part of a communication modem / circuit / chip designed to implement wireless communication technology (eg, LTE, NR). The transceiver 626 can be coupled to the processor 622 and can transmit and / or receive wireless signals through one or more antennas 628. The transceiver 626 may include a transmitter and / or receiver. The transceiver 626 can be mixed with the RF unit. In the present invention, the wireless device may mean a communication modem / circuit / chip.

Hereinafter, the hardware elements of the wireless devices 610 and 620 will be described in more detail. Without being limited to this, one or more protocol layers may be implemented by one or more processors 612 and 622. For example, one or more processors 612, 622 may implement one or more layers (eg, functional layers such as PHY, MAC, RLC, PDCP, RRC, SDAP). The one or more processors 612 and 622 may include one or more Protocol Data Units (PDUs) and / or one or more Service Data Units (SDUs) according to the descriptions, functions, procedures, suggestions, methods and / or operational flowcharts disclosed herein. Can be created. The one or more processors 612 and 622 may generate messages, control information, data or information according to the descriptions, functions, procedures, suggestions, methods and / or operational flowcharts disclosed herein. The one or more processors 612 and 622 generate signals (eg, baseband signals) including PDUs, SDUs, messages, control information, data or information according to the functions, procedures, suggestions and / or methods disclosed herein. , To one or more transceivers 616 and 626. One or more processors 612, 622 may receive signals (eg, baseband signals) from one or more transceivers 616, 626, and the descriptions, functions, procedures, suggestions, methods and / or operational flow diagrams disclosed herein Depending on the field, PDU, SDU, message, control information, data or information may be acquired.

One or more processors 612, 622 may be referred to as a controller, microcontroller, microprocessor, or microcomputer. The one or more processors 612, 622 may be implemented by hardware, firmware, software, or a combination thereof. For example, one or more Application Specific Integrated Circuits (ASICs), one or more Digital Signal Processors (DSPs), one or more Digital Signal Processing Devices (DSPDs), one or more Programmable Logic Devices (PLDs), or one or more Field Programmable Gate Arrays (FPGAs) May be included in one or more processors 612 and 622. Descriptions, functions, procedures, suggestions, methods and / or operational flowcharts disclosed in this document may be implemented using firmware or software, and firmware or software may be implemented to include modules, procedures, functions, and the like. The descriptions, functions, procedures, suggestions, methods and / or operational flowcharts disclosed herein are either firmware or software set to perform or are stored in one or more processors 612, 622 or stored in one or more memories 614, 624 It can be driven by the above processors (612, 622). The descriptions, functions, procedures, suggestions, methods and / or operational flowcharts disclosed herein can be implemented using firmware or software in the form of code, instructions and / or instructions.

The one or more memories 614 and 624 may be coupled to one or more processors 612 and 622, and may store various types of data, signals, messages, information, programs, codes, instructions and / or instructions. The one or more memories 614, 624 may be comprised of ROM, RAM, EPROM, flash memory, hard drive, register, cache memory, computer readable storage medium, and / or combinations thereof. The one or more memories 614 and 624 may be located inside and / or outside of the one or more processors 612 and 622. Also, the one or more memories 614 and 624 may be connected to the one or more processors 612 and 622 through various technologies such as a wired or wireless connection.

The one or more transceivers 616 and 626 may transmit user data, control information, radio signals / channels, and the like referred to in the methods and / or operational flowcharts of this document to one or more other devices. The one or more transceivers 616, 626 may receive user data, control information, radio signals / channels, and the like referred to in the descriptions, functions, procedures, suggestions, methods and / or operational flowcharts disclosed herein from one or more other devices. have. For example, one or more transceivers 616 and 626 may be connected to one or more processors 612 and 622, and may transmit and receive wireless signals. For example, one or more processors 612 and 622 may control one or more transceivers 616 and 626 to transmit user data, control information or wireless signals to one or more other devices. Additionally, one or more processors 612 and 622 may control one or more transceivers 616 and 626 to receive user data, control information or wireless signals from one or more other devices. In addition, one or more transceivers 616, 626 may be connected to one or more antennas 618, 628, and one or more transceivers 616, 626 may be described, functions described herein through one or more antennas 618, 628 , May be set to transmit and receive user data, control information, radio signals / channels, and the like referred to in procedures, proposals, methods, and / or operational flowcharts. In this document, the one or more antennas may be a plurality of physical antennas or a plurality of logical antennas (eg, antenna ports). The one or more transceivers 616 and 626 process the received wireless signal / channel and the like in the RF band signal to process received user data, control information, and wireless signals / channels using one or more processors 612 and 622. It can be converted to a baseband signal. The one or more transceivers 616 and 626 may convert user data, control information, and radio signals / channels processed using one or more processors 612 and 622 from a baseband signal to an RF band signal. To this end, the one or more transceivers 616 and 626 may include (analog) oscillators and / or filters.

Signal processing circuit example to which the present invention can be applied

7 illustrates a signal processing circuit for a transmission signal.

Referring to FIG. 7, the signal processing circuit 700 may include a scrambler 710, a modulator 720, a layer mapper 730, a precoder 740, a resource mapper 750, and a signal generator 760. have. Without being limited thereto, the operations / functions of FIG. 7 may be performed in the processors 612, 622 and / or transceivers 616, 626 of FIG. The hardware elements of FIG. 7 can be implemented in the processors 612, 622 and / or transceivers 616, 626 of FIG. 6. For example, blocks 710 to 760 may be implemented in processors 612 and 622 of FIG. 6. Further, blocks 710 to 750 may be implemented in the processors 612 and 622 of FIG. 6, and block 760 may be implemented in the transceivers 616 and 626 of FIG. 6.

The codeword may be converted into a wireless signal through the signal processing circuit 700 of FIG. 7. Here, the codeword is an encoded bit sequence of an information block. The information block may include a transport block (eg, UL-SCH transport block, DL-SCH transport block). The wireless signal may be transmitted through various physical channels (eg, PUSCH, PDSCH).

Specifically, the codeword may be converted into a scrambled bit sequence by the scrambler 710. The scramble sequence used for scramble is generated based on the initialization value, and the initialization value may include ID information of a wireless device. The scrambled bit sequence may be modulated by a modulator 720 into a modulation symbol sequence. The modulation scheme may include pi / 2-Binary Phase Shift Keying (pi / 2-BPSK), m-Phase Shift Keying (m-PSK), m-Quadrature Amplitude Modulation (m-QAM), and the like. The complex modulated symbol sequence may be mapped to one or more transport layers by the layer mapper 730. The modulation symbols of each transport layer may be mapped to the corresponding antenna port (s) by the precoder 740 (precoding). The output z of the precoder 740 can be obtained by multiplying the output y of the layer mapper 730 by the precoding matrix W of N * M. Here, N is the number of antenna ports and M is the number of transport layers. Here, the precoder 740 may perform precoding after performing transform precoding (eg, DFT transformation) on complex modulation symbols. Further, the precoder 740 may perform precoding without performing transform precoding.

The resource mapper 750 may map modulation symbols of each antenna port to time-frequency resources. The time-frequency resource may include a plurality of symbols (eg, CP-OFDMA symbol, DFT-s-OFDMA symbol) in the time domain and a plurality of subcarriers in the frequency domain. The signal generator 760 generates a radio signal from the mapped modulation symbols, and the generated radio signal can be transmitted to other devices through each antenna. To this end, the signal generator 760 may include an Inverse Fast Fourier Transform (IFFT) module and a Cyclic Prefix (CP) inserter, a Digital-to-Analog Converter (DAC), a frequency uplink converter, etc. .

The signal processing process for the received signal in the wireless device may be configured as the inverse of the signal processing processes 710 to 760 of FIG. 7. For example, the wireless device (eg, 610 and 620 in FIG. 6) may receive a wireless signal from the outside through an antenna port / transceiver. The received radio signal may be converted into a baseband signal through a signal restorer. To this end, the signal recoverer may include a frequency downlink converter (ADC), an analog-to-digital converter (ADC), a CP remover, and a Fast Fourier Transform (FFT) module. Thereafter, the baseband signal may be restored to a codeword through a resource de-mapper process, a postcoding process, a demodulation process, and a de-scramble process. The codeword can be restored to the original information block through decoding. Accordingly, the signal processing circuit (not shown) for the received signal may include a signal restorer, a resource de-mapper, a post coder, a demodulator, a de-scrambler and a decoder.

Examples of using wireless devices to which the present invention can be applied

8 shows another example of a wireless device applied to the present invention. The wireless device may be implemented in various forms according to use-example / service.

Referring to FIG. 8, the wireless devices 610 and 620 correspond to the wireless devices 610 and 620 of FIG. 6, and various elements, components, units / units, and / or modules ). For example, the wireless devices 610 and 620 may include a communication unit 810, a control unit 820, a memory unit 830, and additional elements 840. The communication unit may include a communication circuit 812 and a transceiver (s) 814. For example, the communication circuit 812 can include one or more processors 612,622 and / or one or more memories 614,624 in FIG. For example, transceiver (s) 814 may include one or more transceivers 616,626 and / or one or more antennas 618,628 in FIG. The control unit 820 is electrically connected to the communication unit 810, the memory unit 830, and the additional element 840, and controls various operations of the wireless device. For example, the control unit 820 may control the electrical / mechanical operation of the wireless device based on the program / code / command / information stored in the memory unit 830. In addition, the control unit 820 transmits the information stored in the memory unit 830 to the outside (eg, another communication device) through the wireless / wired interface through the communication unit 810, or through the communication unit 810 to the outside (eg, Information received through a wireless / wired interface from another communication device) may be stored in the memory unit 830.

The additional element 840 may be variously configured according to the type of wireless device. For example, the additional element 840 may include at least one of a power unit / battery, an input / output unit (I / O unit), a driving unit, and a computing unit. Although not limited to this, wireless devices include robots (FIGS. 5, 10000a), vehicles (FIGS. 5, 10000b-1, 10000b-2), XR devices (FIGS. 5, 10000c), portable devices (FIGS. 5, 10000d), and consumer electronics. (Fig. 5, 10000e), IoT device (Fig. 5, 10000f), digital broadcasting terminal, hologram device, public safety device, MTC device, medical device, fintech device (or financial device), security device, climate / environment device, It may be implemented in the form of an AI server / device (FIG. 5, 40000), a base station (FIG. 5, 20000), a network node, or the like. The wireless device may be movable or used in a fixed place depending on the use-example / service.

In FIG. 8, various elements, components, units / parts, and / or modules in the wireless devices 610 and 620 may be connected to each other through a wired interface, or at least some of them may be connected wirelessly through the communication unit 810. For example, in the wireless devices 610 and 620, the control unit 820 and the communication unit 810 are connected by wire, and the control unit 820 and the first unit (eg, 830, 840) are through the communication unit 810. It can be connected wirelessly. In addition, each element, component, unit / unit, and / or module in the wireless devices 610 and 620 may further include one or more elements. For example, the control unit 820 may be configured with one or more processor sets. For example, the control unit 820 may be configured as a set of a communication control processor, an application processor, an electronic control unit (ECU), a graphic processing processor, and a memory control processor. As another example, the memory unit 830 may include random access memory (RAM), dynamic RAM (DRAM), read only memory (ROM), flash memory, volatile memory, and non-volatile memory (non- volatile memory) and / or combinations thereof.

Hereinafter, the implementation example of FIG. 8 will be described in more detail with reference to the drawings.

Examples of mobile devices to which the present invention can be applied

9 illustrates a portable device applied to the present invention. The portable device may include a smart phone, a smart pad, a wearable device (eg, a smart watch, smart glasses), and a portable computer (eg, a notebook, etc.). The mobile device may be referred to as a mobile station (MS), a user terminal (UT), a mobile subscriber station (MSS), a subscriber station (SS), an advanced mobile station (AMS), or a wireless terminal (WT).

Referring to FIG. 9, the mobile device 610 includes an antenna unit 618, a communication unit 810, a control unit 820, a memory unit 830, a power supply unit 840a, an interface unit 840b, and an input / output unit 840c. ). The antenna unit 618 may be configured as part of the communication unit 810. Blocks 810 to 830 / 840a to 840c correspond to blocks 810 to 830/840 in FIG. 8, respectively.

The communication unit 810 may transmit and receive signals (eg, data, control signals, etc.) with other wireless devices and base stations. The control unit 820 may perform various operations by controlling components of the mobile device 610. The control unit 820 may include an application processor (AP). The memory unit 830 may store data / parameters / programs / codes / instructions required for driving the portable device 610. Also, the memory unit 830 may store input / output data / information. The power supply unit 840a supplies power to the mobile device 610, and may include a wire / wireless charging circuit, a battery, and the like. The interface unit 840b may support the connection between the mobile device 610 and other external devices. The interface unit 840b may include various ports (eg, audio input / output ports, video input / output ports) for connection with external devices. The input / output unit 840c may receive or output image information / signal, audio information / signal, data, and / or information input from a user. The input / output unit 840c may include a camera, a microphone, a user input unit, a display unit 840d, a speaker, and / or a haptic module.

For example, in the case of data communication, the input / output unit 840c acquires information / signal (eg, touch, text, voice, image, video) input from a user, and the obtained information / signal is transmitted to the memory unit 830. Can be saved. The communication unit 810 may convert information / signals stored in the memory into wireless signals, and transmit the converted wireless signals directly to other wireless devices or to a base station. In addition, after receiving a radio signal from another wireless device or a base station, the communication unit 810 may restore the received radio signal to original information / signal. After the restored information / signal is stored in the memory unit 830, it can be output in various forms (eg, text, voice, image, video, heptic) through the input / output unit 840c.

Term Definition

eLTE eNB: The eLTE eNB is an evolution of the eNB that supports connectivity to EPC and NGC.

gNB: A node that supports NR as well as a connection with NGC.

New RAN: A radio access network that supports NR or E-UTRA or interacts with NGC.

Network slice: A network slice is a network defined by the operator to provide an optimized solution for specific market scenarios that require specific requirements along with end-to-end coverage.

Network function: A network function is a logical node within a network infrastructure with well-defined external interfaces and well-defined functional behavior.

NG-C: Control plane interface used for the NG2 reference point between the new RAN and NGC.

NG-U: User plane interface used for NG3 reference point between new RAN and NGC.

Non-standalone NR: Deployment configuration where gNB requires LTE eNB as an anchor for control plane connection to EPC or eLTE eNB as an anchor for control plane connection to NGC.

Non-standalone E-UTRA: Deployment configuration where eLTE eNB requires gNB as an anchor for control plane connection to NGC.

User plane gateway: The endpoint of the NG-U interface.

Numerology: corresponds to one subcarrier spacing in the frequency domain. By scaling the reference subcarrier spacing to the integer N, different numerology can be defined.

NR: NR Radio Access or New Radio

System general

10 is a view showing an example of the overall system structure of the NR to which the method proposed in this specification can be applied.

Referring to FIG. 10, the NG-RAN consists of NG-RA user planes (new AS sublayer / PDCP / RLC / MAC / PHY) and gNBs that provide control plane (RRC) protocol termination for UE (User Equipment). do.

The gNBs are interconnected through an Xn interface.

The gNB is also connected to the NGC through the NG interface.

More specifically, the gNB is connected to an Access and Mobility Management Function (AMF) through an N2 interface and a User Plane Function (UPF) through an N3 interface.

NR (New Rat) Numerology and Frame Structure

In the NR system, multiple numerologies may be supported. Here, the numerology may be defined by subcarrier spacing and CP (Cyclic Prefix) overhead. At this time, a plurality of subcarrier intervals is the default subcarrier interval N (or,

) Can be derived by scaling. Further, even if it is assumed that a very low subcarrier spacing is not used at a very high carrier frequency, the numerology used can be selected independently of the frequency band.

In addition, in the NR system, various frame structures according to a number of pneumatics may be supported.

Hereinafter, an orthogonal frequency division multiplexing (OFDM) numerology and a frame structure that can be considered in an NR system will be described.

Multiple OFDM neurology supported in the NR system may be defined as shown in Table 1.

NR supports multiple numerology (or subcarrier spacing (SCS)) to support various 5G services. For example, when the SCS is 15 kHz, it supports a wide area in traditional cellular bands, and when the SCS is 30 kHz / 60 kHz, it is dense-urban, lower latency. And a wider carrier bandwidth, and when the SCS is 60 kHz or higher, a bandwidth greater than 24.25 GHz is supported to overcome phase noise.

The NR frequency band is defined as a frequency range of two types (FR1, FR2). FR1, FR2 may be configured as shown in Table 2 below. In addition, FR2 may mean millimeter wave (mmW).

With respect to the frame structure in the NR system, the size of various fields in the time domain is

It is expressed as a multiple of the unit of time. From here,

ego,

to be. Downlink (downlink) and uplink (uplink) transmission is

It consists of a radio frame (radio frame) having a section of. Here, each radio frame is

It consists of 10 subframes (subframes) having an interval of. In this case, there may be one set of frames for uplink and one set of frames for downlink.

11 shows a relationship between an uplink frame and a downlink frame in a wireless communication system to which the method proposed in this specification can be applied.

As shown in FIG. 11, transmission of an uplink frame number i from a user equipment (UE) is greater than the start of a corresponding downlink frame at the corresponding terminal.

You have to start earlier.

New Merology

For, slots are within a subframe

Numbered in increasing order, within the radio frame

It is numbered in increasing order. One slot

Consisting of consecutive OFDM symbols of,

Is determined according to the numerology and slot configuration used. Slot in subframe

Start of OFDM symbol in the same subframe

It is aligned with the start of time.

Not all terminals can transmit and receive at the same time, which means that not all OFDM symbols in a downlink slot or an uplink slot cannot be used.

Table 3 is pneumomerology

Table 4 shows the number of OFDM symbols per slot for a normal CP in Table 4.

Represents the number of OFDM symbols per slot for an extended CP in.

NR Physical Resource

With respect to physical resources in the NR system, an antenna port, a resource grid, a resource element, a resource block, a carrier part, etc. Can be considered.

Hereinafter, the physical resources that can be considered in the NR system will be described in detail.

First, with respect to the antenna port, the antenna port is defined such that the channel on which the symbol on the antenna port is carried can be deduced from the channel on which the other symbol on the same antenna port is carried. If the large-scale property of a channel carrying a symbol on one antenna port can be inferred from a channel carrying a symbol on another antenna port, the two antenna ports are QC / QCL (quasi co-located or quasi co-location). Here, the wide-scale characteristics include one or more of delay spread, doppler spread, frequency shift, average received power, and received timing.

12 shows an example of a resource grid supported by a wireless communication system to which the method proposed in this specification can be applied.

Referring to Figure 12, the resource grid is on the frequency domain

It is configured by subcarriers, one subframe is composed of 14 x 2 ^u OFDM symbols as an example, but is not limited thereto.

In the NR system, the transmitted signal is

One or more resource grids consisting of subcarriers and

It is described by the OFDM symbols of. From here,

to be. remind

Denotes a maximum transmission bandwidth, which may vary between uplink and downlink as well as numerology.

In this case, as shown in Fig. 13, pneumatic

And one resource grid for each antenna port p.

13 shows examples of an antenna port and a resource grid for each neurology to which the method proposed in this specification can be applied.

New Merology

And each element of the resource grid for the antenna port p is referred to as a resource element, an index pair

It is uniquely identified by. From here,

Is an index on the frequency domain,

Indicates the position of the symbol in the subframe. When referring to a resource element in a slot, an index pair

Is used. From here,

to be.

New Merology

And resource elements for antenna port p

Is the complex value

Corresponds to If there is no risk of confusion, or if a specific antenna port or numerology is not specified, the indexes p and

Can be dropped, resulting in a complex value

or

Can be

In addition, a physical resource block (physical resource block) on the frequency domain

It is defined as consecutive subcarriers. On the frequency domain, physical resource blocks are from 0

Are numbered. At this time, the physical resource block number on the frequency domain (physical resource block number)

And resource elements

The relationship between them is given by Equation 1.

In addition, with respect to the carrier part, the terminal may be configured to receive or transmit using only a subset of the resource grid. At this time, the set of resource blocks set to be received or transmitted by the terminal starts from 0 on the frequency domain.

Are numbered.

Self-contained slot structure

In order to minimize the latency of data transmission in the TDD system, the self-contained slot structure as shown in FIG. 14 is considered in the fifth generation New RAT (NR).

That is, FIG. 14 is a diagram showing an example of a self-contained slot structure to which the method proposed in this specification can be applied.

In FIG. 14, the hatched region 1410 represents a downlink control region, and the black portion 1420 represents an uplink control region.

The portion 1430 without any indication may be used for downlink data transmission or may be used for uplink data transmission.

The characteristics of this structure are that DL transmission and UL transmission are sequentially performed in one slot, DL data is transmitted in one slot, and UL Ack / Nack can be transmitted and received.

Such a slot can be defined as a 'self-contained slot'.

That is, through this slot structure, the base station reduces the time it takes to retransmit data to the terminal when a data transmission error occurs, thereby minimizing the latency of the final data transmission.

In this self-contained slot structure, a base station and a terminal need a time gap for a process of switching from a transmission mode to a reception mode or a process of switching from a reception mode to a transmission mode.

To this end, in the corresponding slot structure, some OFDM symbols at a time point of switching from DL to UL are set as a guard period (GP).

Analog beamforming

In millimeter wave (mmW), the wavelength is shortened, so multiple antennas can be installed in the same area. That is, in the 30 GHz band, the wavelength is 1 cm, and a total of 100 antenna elements are formed in a 2-dimensional array in 0.5 lambda (ie, wavelength) intervals on a panel of 5 X 5 (5 by 5) cm. Installation is possible. Therefore, in mmW, a plurality of antenna elements are used to increase beamforming (BF) gain to increase coverage or increase throughput.

In this case, having a transceiver unit (TXRU) to allow transmission power and phase adjustment for each antenna element enables independent beamforming for each frequency resource. However, in order to install the TXRU on all 100 antenna elements, there is a problem of ineffectiveness in terms of price. Therefore, a method of mapping a plurality of antenna elements to one TXRU and adjusting a beam direction with an analog phase shifter is considered. The analog beamforming method has a disadvantage in that only one beam direction can be made in all bands, so that frequency selective BF cannot be performed.

It is possible to consider hybrid beamforming (BB) having B TXRUs, which is a smaller number than Q antenna elements, in the intermediate form of digital BF and analog BF. In this case, although there are differences depending on the connection scheme of the B TXRU and Q antenna elements, the direction of beams that can be simultaneously transmitted is limited to B or less.

Initial Access (IA) Procedure

Synchronization Signal Block (SSB) transmission and related operations

15 illustrates the SSB structure. The UE may perform cell search, system information acquisition, beam alignment for initial access, DL measurement, and the like based on the SSB. SSB is mixed with SS / PBCH (Synchronization Signal / Physical Broadcast channel) block.

15, the SSB is composed of PSS, SSS and PBCH. SSB is composed of four consecutive OFDM symbols, and PSS, PBCH, SSS / PBCH and PBCH are transmitted for each OFDM symbol. PSS and SSS are each composed of 1 OFDM symbol and 127 subcarriers, and PBCH is composed of 3 OFDM symbols and 576 subcarriers. Polar coding and quadrature phase shift keying (QPSK) are applied to the PBCH. The PBCH is composed of a data RE and a DMRS (Demodulation Reference Signal) RE for each OFDM symbol. There are three DMRS REs for each RB, and three data REs exist between the DMRS REs.

Cell search

Cell search refers to a process in which a terminal acquires time / frequency synchronization of a cell and detects a cell ID (eg, physical layer cell ID, PCID) of the cell. PSS is used to detect the cell ID in the cell ID group, SSS is used to detect the cell ID group. PBCH is used for SSB (time) index detection and half-frame detection.

The cell search process of the terminal may be summarized as shown in Table 5 below.

336 cell ID groups exist, and 3 cell IDs exist for each cell ID group. There are 1008 cell IDs in total, and the cell ID may be defined by Equation 2.

here,

ego,

.

Here, NcellID represents a cell ID (eg, PCID). N (1) ID represents a group of cell IDs and is provided / obtained through SSS. The N (2) ID represents the cell ID in the cell ID group and is provided / obtained through PSS.

The PSS sequence dPSS (n) may be defined to satisfy Equation (3).

here,

ego,

to be.

The SSS sequence dSSS (n) may be defined to satisfy Equation (4).

here,

ego,

to be.

16 illustrates SSB transmission.

Referring to FIG. 16, the SSB is periodically transmitted according to the SSB period. When the initial cell is searched, the SSB basic period assumed by the UE is defined as 20 ms. After cell access, the SSB period can be set to one of {5ms, 10ms, 20ms, 40ms, 80ms, 160ms} by a network (eg, a base station). At the beginning of the SSB period, a set of SSB bursts is constructed. The SSB burst set consists of a 5 ms time window (ie, half-frame), and the SSB can be transmitted up to L times within the SS burst set. The maximum transmission frequency L of the SSB may be given as follows according to the frequency band of the carrier. One slot includes up to two SSBs.

-For frequency range up to 3 GHz, L = 4

-For frequency range from 3GHz to 6 GHz, L = 8

-For frequency range from 6 GHz to 52.6 GHz, L = 64

The time position of the SSB candidate in the SS burst set may be defined as follows according to the SCS. The time position of the SSB candidate is indexed from 0 to L-1 according to the time order within the SSB burst set (ie, half-frame) (SSB index).

-Case A-15 kHz SCS: The index of the starting symbol of the candidate SSB is given as {2, 8} + 14 * n. When the carrier frequency is 3 GHz or less, n = 0, 1. When the carrier frequency is 3 GHz to 6 GHz, n = 0, 1, 2, 3.

-Case B-30 kHz SCS: The index of the starting symbol of the candidate SSB is given as {4, 8, 16, 20} + 28 * n. When the carrier frequency is 3 GHz or less, n = 0. When the carrier frequency is 3 GHz to 6 GHz, n = 0, 1.

-Case C-30 kHz SCS: The index of the starting symbol of the candidate SSB is given as {2, 8} + 14 * n. When the carrier frequency is 3 GHz or less, n = 0, 1. When the carrier frequency is 3 GHz to 6 GHz, n = 0, 1, 2, 3.

-Case D-120 kHz SCS: The index of the starting symbol of the candidate SSB is given as {4, 8, 16, 20} + 28 * n. When the carrier frequency is greater than 6 GHz, n = 0, 1, 2, 3, 5, 6, 7, 8, 10, 11, 12, 13, 15, 16, 17, 18.

-Case E-240 kHz SCS: The index of the starting symbol of the candidate SSB is given as {8, 12, 16, 20, 32, 36, 40, 44} + 56 * n. When the carrier frequency is greater than 6 GHz, n = 0, 1, 2, 3, 5, 6, 7, 8.

17 illustrates that a terminal acquires information on DL time synchronization.

The terminal may acquire DL synchronization by detecting the SSB. The UE may identify the structure of the SSB burst set based on the detected SSB index, and thus detect a symbol / slot / half-frame boundary. The number of the frame / half-frame to which the detected SSB belongs may be identified using SFN information and half-frame indication information.

Specifically, the terminal may acquire 10-bit System Frame Number (SFN) information from the PBCH (s0 to s9). Of the 10-bit SFN information, 6 bits are obtained from a Master Information Block (MIB), and the remaining 4 bits are obtained from a PBCH Transport Block (TB).

Next, the terminal may acquire 1-bit half-frame indication information (c0). When the carrier frequency is 3 GHz or less, the half-frame indication information may be implicitly signaled using PBCH DMRS. The PBCH DMRS indicates 3 bit information by using one of 8 PBCH DMRS sequences. Therefore, in the case of L = 4, among the 3 bits that can be indicated using 8 PBCH DMRS sequences, the 1 bit remaining after indicating the SSB index can be used for half-frame indication purposes.

Finally, the terminal can obtain an SSB index based on the DMRS sequence and the PBCH payload. SSB candidates are indexed from 0 to L-1 in time order within an SSB burst set (ie, half-frame). When L = 8 or 64, 3 bits of the least significant bit (LSB) of the SSB index may be indicated using 8 different PBCH DMRS sequences (b0 to b2). When L = 64, the MSB (Most Significant Bit) 3 bits of the SSB index are indicated through the PBCH (b3 to b5). When L = 2, the LSB 2 bits of the SSB index can be indicated using four different PBCH DMRS sequences (b0, b1). When L = 4, among the 3 bits that can be indicated by using 8 PBCH DMRS sequences, the SSB index is indicated and the remaining 1 bit can be used for half-frame indication (b2).

System information acquisition

18 illustrates a system information (SI) acquisition process. The terminal may acquire AS- / NAS-information through the SI acquisition process. The SI acquisition process may be applied to terminals in the RRC_IDLE state, RRC_INACTIVE state, and RRC_CONNECTED state.

SI is divided into MIB (Master Information Block) and a plurality of SIB (System Information Block). SI other than MIB may be referred to as Remaining Minimum System Information (RMSI). For details, refer to the following.

-MIB includes information / parameters related to SIB1 (SystemInformationBlock1) reception and is transmitted through the PBCH of the SSB. Upon initial cell selection, the UE assumes that the half-frame with the SSB is repeated in a period of 20 ms. The UE may check whether a Control Resource Set (CORESET) for a Type0-PDCCH common search space exists based on the MIB. The Type0-PDCCH common search space is a type of PDCCH search space and is used to transmit a PDCCH for scheduling SI messages. When a Type0-PDCCH common search space exists, the UE based on information in the MIB (eg, pdcch-ConfigSIB1) (i) a plurality of consecutive RBs constituting a CORESET and one or more consecutive symbols and (ii) a PDCCH opportunity (Ie, time domain location for PDCCH reception) can be determined. When the Type0-PDCCH common search space does not exist, pdcch-ConfigSIB1 provides information on the frequency location where SSB / SIB1 exists and the frequency range where SSB / SIB1 does not exist.

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

-SIBx is included in the SI message and transmitted through PDSCH. Each SI message is transmitted within a periodic time window (ie, SI-window).

Random Access Procedure

The random access procedure of the terminal can be summarized as shown in Table 6 and FIG. 19.

19 illustrates an example of a random access procedure.

First, the UE may transmit the PRACH preamble as Msg1 of the random access procedure in UL.

Random access preamble sequences having two different lengths are supported. Long sequence length 839 is applied as subcarrier spacing of 1.25 and 5 kHz, and short sequence length 139 is applied as spacing between subcarriers of 15, 30, 60 and 120 kHz. The long sequence supports both the unrestricted set and the limited set of type A and type B, while the short sequence supports only the unrestricted set.

Multiple RACH preamble formats are defined by one or more RACH OFDM symbols, and different cyclic prefix and guard time. A PRACH preamble configuration for use is provided to a terminal in system information.

If there is no response to Msg1, the UE may retransmit the PRACH preamble within a predetermined number of times by power ramping. The terminal calculates the PRACH transmission power for retransmission of the preamble based on the most recent path loss and power ramping counter. When the terminal performs beam switching, the power ramping counter remains unchanged.

The system information informs the UE of the association between the SS block and the RACH resource.

20 shows a concept of a threshold value for an SS block for RACH resource association.

The threshold of SS block for RACH resource association is based on RSRP and configurable network. The transmission or retransmission of the RACH preamble is based on SS blocks that meet the threshold.

When the UE receives the random access response on the DL-SCH, the DL-SCH may provide timing alignment information, RA-preamble ID, initial UL grant, and temporary C-RNTI.

Based on this information, the UE may transmit UL transmission on the UL-SCH as Msg3 of a random access procedure. Msg3 may include an RRC connection request and a terminal identifier.

In response, the network may send Msg4, which may be treated as a contention resolution message on the DL. By receiving this, the terminal can enter the RRC connected state.

The detailed description of each step is as follows:

Before initiating a physical random access procedure, Layer-1 must receive a set of SS / PBCH block indices from a higher layer, and must provide a corresponding set of RSRP measurements to a higher layer.

Before initiating the physical random access procedure, Layer-1 must receive the following information from the higher layer:

Configuration of physical random access channel (PRACH) transmission parameters (PRACH preamble format for PRACH transmission, time resource, and frequency resource).

-PRACH preamble sequence set (index to logical root sequence table, cyclic shift (

), And parameters for determining the cyclic shifts of the root sequences and their cyclic shifts in the type of set (unrestricted set, limited set A, or limited set B).

From the perspective of the physical layer, the L1 random access procedure includes transmission of a random access preamble (Msg1) in a PRACH, a random access response (RAR) message (Msg2) with PDCCH / PDSCH, and Msg3 PUSCH for contention resolution, if applicable. And PDSCH transmission.

When the random access procedure is initiated by the "PDCCH order" to the terminal, the random access preamble transmission is performed with the same interval between subcarriers as the random access preamble transmission initiated by the higher layer.

When a UE is configured with two UL carriers for one service cell, and the UE detects "PDCCH order", the UE receives a supplementary UL (UL / SUL) field value from the detected "PDCCH order" Use to determine the UL carrier for the corresponding random access preamble transmission.

With respect to the random access preamble transmission step, a physical random access procedure is triggered by a request for PRACH transmission by higher layer or PDCCH order. The configuration by higher layer for PRACH transmission includes:

-Configuration for PRACH transmission.

-Preamble index, spacing between preamble subcarriers,

, Corresponding RA-RNTI, and PRACH resources.

The preamble uses the selected PRACH format on the indicated PRACH resource to transmit power.

Is sent as.

A plurality of SS / PBCH blocks associated with one PRACH opportunity is provided to the terminal by the value of the higher layer parameter SSB-perRACH-Occasion. When the value of SSB-perRACH-Occasion is less than 1, one SS / PBCH block is mapped to 1 / SSB-per-rach-occasion consecutive PRACH opportunities. The UE is provided with a plurality of preambles per SS / PBCH block by the value of the higher layer parameter cb-preamblePerSSB, and the UE sets the total number of preambles per SSB per PRACH, the value of SSB-perRACH-Occasion and the value of cb-preamblePerSSB. Determine by multiple of value.

The SS / PBCH block index is mapped to PRACH opportunities in the following order.

-First, mapping in increasing order of preamble indexes within a single PRACH opportunity

Secondly, mapping in increasing order of frequency resource indexes for frequency multiplex PRACH opportunities.

Third, mapping in increasing order of time resource indexes for time multiplex PRACH opportunities in the PRACH slot.

-Fourth, mapping in increasing order of indexes for the PRACH slot.

The period for mapping to PRACH opportunities for the SS / PBCH block starts from frame 0,

This is the smallest value among the larger or equal {1, 2, 4} PRACH configuration cycles, where the terminal is from higher layer parameter SSB-transmitted-SIB1.

To acquire

Is a number of SS / PBCH blocks that can be mapped to one PRACH configuration cycle.

When the random access procedure is initiated by the PDCCH order, when the higher layer requests, the UE will transmit the PRACH at the first available PRACH opportunity. At this time, in the case of the PDCCH, between the last symbol of reception and the first symbol of PRACH transmission time is

Will be greater than or equal to milliseconds, where:

Corresponds to the PUSCH preparation time for the PUSCH processing capacity

The duration of the symbols,

Is defined in the dictionary,

to be.

In response to the PRACH transmission, the UE attempts to detect a PDCCH having a corresponding RA-RNTI during a window controlled by a higher layer. The window is at least in the first symbol of the earliest control resource set configured by the terminal for the Type1-PDCCH general search space, that is, at least after the last symbol of the preamble sequence transmission.

Start after the symbol. The length of the window as the number of slots is provided by the higher layer parameter rar-WindowLength based on the spacing between subcarriers for the Type0-PDCCH general search space.

When the UE detects a corresponding PDSCH including a PDCCH having a RA-RNTI and a DL-SCH transport block in a corresponding window, the UE delivers the transport block to a higher layer. The higher layer parses the transport block for random access preamble identification (RAPID) associated with PRACH transmission. When the higher layer identifies the RAPID in the RAR message (s) of the DL-SCH transport block, the higher layer instructs the physical layer to allow uplink. This is called a random access response (RAR) UL grant in the physical layer. If the higher layer does not identify the RAPID associated with the PRACH transmission, the higher layer may instruct the physical layer to transmit the PRACH. The minimum time between the last symbol of PDSCH reception and the first symbol of PRACH transmission is

Equal to milliseconds, where

Additional PDSCH DM-RS is configured and

Corresponds to PDSCH reception time for PDSCH processing capacity 1

The elapsed time of the symbols.

The UE has a corresponding PDSCH including a PDCCH having a corresponding RA-RNTI and a detected SS / PBCH block or a DL-SCH transmission block having a DM-RS antenna port quasi co-location (QCL) attribute identical to the received CSI-RS. Will receive. When a UE attempts to detect a PDCCH having a corresponding RA-RNTI in response to a PRACH transmission initiated by a PDCCH order, the UE has the same DM-RS antenna port QCL attribute as the PDCCH and the PDCCH order. I assume.

The RAR UL grant schedules PUSCH transmission from the terminal (Msg3 PUSCH). The contents of the RAR UL grant, starting with the MSB and ending with the LSB, are given in Table 7. Table 7 shows the random access response grant content field size.

The Msg3 PUSCH frequency resource allocation is for uplink resource allocation type 1. For frequency hopping, the first one or two bits of the Msg3 PUSCH frequency resource allocation field, based on the indication of the frequency hopping flag field,

The bit is used as a hopping information bit.

The MCS is determined from the first 16 indexes of the MCS index table applicable for PUSCH.

TPC instruction

Is used to set the power of the Msg3 PUSCH, and is interpreted according to Table 7. Table 8 shows TPC commands for Msg3 PUSCH

Shows

In a non-contention based random access procedure, the CSI request field is interpreted to determine whether aperiodic CSI reporting is included in the corresponding PUSCH transmission. In the contention-based random access procedure, the CSI request field is reserved.

If the interval between sub-carriers is not set in the terminal, the terminal receives the subsequent PDSCH using the same inter-carrier interval as in the case of receiving PDSCH providing an RAR message.

When the UE does not detect the PDCCH having the RA-RNTI and the DL-SCH transmission block in the window, the UE performs a procedure for failing to receive a random access response.

For example, the terminal may perform power ramping for retransmission of the random access preamble based on the power ramping counter. However, as shown in FIG. 21 below, when the UE performs beam switching in PRACH retransmission, the power ramping counter is maintained unchanged.

21 is a diagram for explaining a power ramping counter of a PRACH.

In FIG. 21, the UE may increase the power ramping counter by 1 when it retransmits the random access preamble for the same beam. However, when the beam is changed, this power ramping counter remains unchanged.

With regard to Msg3 PUSCH transmission, the higher layer parameter msg3-tp instructs the terminal whether the terminal should apply transform precoding for Msg3 PUSCH transmission. When the UE applies transmission transform precoding to Msg3 PUSCH having frequency hopping, the frequency offset for the second hop is given in Table 9. Table 9 shows the frequency offset for the second hop for transmission on Msg3 PUSCH with frequency hopping.

The spacing between subcarriers for Msg3 PUSCH transmission is provided by the higher layer parameter msg3-scs. The UE will transmit PRACH and Msg3 PUSCH on the same uplink carrier in the same service providing cell. UL BWP for Msg3 PUSCH transmission is indicated by SystemInformationBlock1.

When the PDSCH and the PUSCH have the same subcarrier interval, the minimum time between the last signal of the PDSCH reception transmitting the RAR and the first signal of the corresponding Msg3 PUSCH transmission scheduled by the RAR in the PDSCH for the UE is

Equal to milliseconds.

Corresponds to the PDSCH reception time for PDSCH processing capacity 1 when an additional PDSCH DM-RS is configured.

The elapsed time of the symbols,

Corresponds to the PUSCH preparation time for PUSCH processing capacity 1

The elapsed time of symbols,

Is the maximum timing adjustment value that can be provided by the TA command field in the RAR.

When a C-RNTI is not provided to the UE in response to the Msg3 PUSCH transmission, the UE attempts to detect a PDCCH having a corresponding TC-RNTI that schedules a PDSCH including identification of UE contention resolution. In response to the reception of the PDSCH having the identification of the terminal contention resolution, the terminal transmits HARQ-ACK information in the PUCCH. The minimum time between the last symbol of PDSCH reception and the first symbol of the corresponding HARQ-ACK transmission is

Equal to milliseconds.

Corresponds to the PDSCH reception time for PDSCH processing capacity 1 when an additional PDSCH DM-RS is configured.

The elapsed time of the symbols.

Channel coding Scheme (channel coding scheme)

The channel coding scheme for an embodiment of the present specification mainly includes: (1) LDPC (Low Density Parity Check) coding scheme for data, and (2) Polarity for control information Coding scheme. Other coding schemes such as repetition coding / simpleplex coding / Reed-Muller coding

Specifically, the network / terminal may perform LDPC coding for PDSCH / PUSCH having two base graph (BG) support. BG1 is for the mother code rate 1/3, and BG2 is for the mother code rate 1/5.

For coding of control information, repetition coding / simplex coding / Reed-Muller coding can be supported. For the case where the control information has a length exceeding 11 bits, a polarity coding scheme can be used. For DL, the parent code size may be 512, and for UL, the parent code size may be 1024. Table 10 summarizes coding schemes for uplink control information.

As described above, a polar coding scheme can be used for PBCH. This coding scheme may be as in the PDCCH.

The LDPC coding structure will be described in detail.

The LDPC code is a (n, k) linear block code defined as a (n-k) ｘn sparse parity check matrix H-null-space.

 22 shows an example of a parity check matrix.

In one embodiment of the present specification, a quasi-cyclic (QC) LDPC code is used. In this embodiment, the parity check matrix is an mｘn array of ZｘZ circulant permutation matrices. By using such a QC LDPC, it is possible to achieve encoding and decoding with reduced complexity and highly parallel processing.

23 shows an example of a parity check matrix based on a 4ｘ4 cyclic permutation matrix.

In FIG. 23, H is represented by a shift value (cyclic matrix) and 0 (= zero matrix) instead of Pi.

Fig. 24 shows the encoder structure for the polar code. Specifically, FIG. 24 (a) shows the basic module for the polar code, and FIG. 24 (b) shows the base matrix.

Polar code is known in the art as a code capable of achieving channel capacity in a binary-input discrete memoryless channel (B-DMC). That is, when the size N of the code block increases to infinity, channel capacity can be achieved. The encoder of the polar code performs channel combining and channel separation as shown in FIG. 25.

25 shows an example of channel combining and channel separation of a polar code.

After the initial connection, the UE performs a method, embodiment, or operation proposed in this specification, which will be described later, when performing a PDSCH / PUSCH transmission after instructing or setting a repetitive transmission operation to a base station through L1 signaling or higher layer parameter. Can be. In addition, when the base station instructs or sets the repetitive transmission operation through the L1 signaling or higher layer parameter to the terminal after the initial connection and receives PDSCH / PUSCH transmission from the terminal, the method, embodiment, or operation proposed in the specification described below And the like.

Bandwidth part (BWP)

The NR system can support up to 400 MHz per component carrier (CC). If the terminal operating in the wideband CC always operates with the RF on the entire CC turned on, the terminal battery consumption may increase. Or, considering various use cases (e.g., eMBB, URLLC, Mmtc, V2X, etc.) operating in one wideband CC, different numerology (e.g., sub-carrier spacing) can be supported for each frequency band in the corresponding CC. Or, the maximum bandwidth capability may be different for each terminal. In consideration of this, the base station may instruct the terminal to operate only in a part of the bandwidth, not the entire bandwidth of the wideband CC, and the corresponding part of the bandwidth is defined as a bandwidth part (BWP) for convenience. The BWP may be composed of continuous resource blocks (RBs) on a frequency axis, and may correspond to one numerology (e.g., sub-carrier spacing, CP length, slot / mini-slot duration).

Meanwhile, the base station can set multiple BWPs even within one CC configured to the terminal. For example, in a PDCCH monitoring slot, a BWP occupying a relatively small frequency domain is set, and a PDSCH indicated by the PDCCH can be scheduled on a larger BWP. Alternatively, when UEs are concentrated on a specific BWP, some UEs may be set to other BWPs for load balancing. Alternatively, some spectrum of the entire bandwidth may be excluded and both BWPs may be set within the same slot in consideration of frequency domain inter-cell interference cancellation between neighboring cells. That is, the base station can configure at least one DL / UL BWP to a terminal associated with a wideband CC, and configures at least one DL / UL BWP (L1 signaling or MAC) of the configured DL / UL BWP (s) at a specific time. CE or RRC signaling) and switching to another configured DL / UL BWP (by L1 signaling or MAC CE or RRC signaling) or when timer-based timer value expires It can also be switched. At this time, the activated DL / UL BWP is defined as an active DL / UL BWP. However, in a situation in which the terminal is in the initial access process or before the RRC connection is set up, the configuration for DL / UL BWP may not be received. In this situation, the DL / UL BWP assumed by the terminal is the initial active DL. Defined as / UL BWP.

UCI enhancement

FIG. 26 (a) shows a single PUCCH including back-to-back scheduling and HARQ-ACK feedbacks in one slot. (Back-to-back scheduling and a single PUCCH containing HARQ-ACK feedbacks within a slot.)

26 (b) is a diagram illustrating a plurality of PUCCHs including a plurality of HARQ-ACK feedbacks in one slot corresponding to each of back-to-back scheduling and scheduling (PDSCH). (Back-to-back) scheduling and the corresponding multiple HARQ-ACK feedbacks within a slot)

Considering strict latency and reliability requirements such as URLLC service, HARQ-ACK feedback corresponding to a plurality of PDSCHs according to the current NR rel-15 standard is determined by the PUCCH to be transmitted to one specific slot. When a rule is defined to configure the HARQ-ACK codebook (FIG. 26 (a)), there is a problem that the HARQ-ACK payload size becomes relatively large and may result in degradation of PUCCH transmission performance. . In addition, in order to support a latency-critical service, it may be necessary to repeatedly transmit a plurality of PDSCHs having a short duration, even in a slot, by scheduling of a base station. If only one HARQ-ACK PUCCH transmission is allowed in a slot even if the PDSCH is transmitted, HARQ-ACK feedback transmission for the back-to-back scheduling is relatively performed. There is a problem that can be delayed. Therefore, for more flexible and efficient resource utilization and service support, and for faster and robust UL channel transmission, a PUCCH (or PUSCH) including a plurality of HARQ-ACKs in a slot should be able to be transmitted. (Fig. 26 (b))

Scheduling / HARQ processing timeline

In general, the PDSCH / PUSCH by the PDCCH received earlier is received / transmitted before the PDSCH / PUSCH by the PDCCH received later. Therefore, in the case of the current standard NR Rel-15 terminal, out-of-order PDSCH / PUSCH scheduling is not allowed and the terminal is thus not expected to have this situation. Also similarly, the out-of-order HARQ transmission / feedback is not allowed and the terminal is thus not expected to expect this situation.

In the case of a terminal having traffic of various requirements (e.g., eMBB and URLLC), a packet scheduled later is scheduled ahead to satisfy a more stringent latency requirement for a specific service (e.g., URLLC) Operations that are processed before packets may need to be allowed. In addition, it may be necessary to allow an operation in which HARQ-ACK for a packet scheduled later is transmitted before HARQ-ACK for a packet scheduled earlier.

At this time, for out-of-order scheduling, for any two HARQ process IDs A and B for a given cell, if the scheduling DCI scrambled with C-RNTI for unicast PUSCH transmission A is unicast PUSCH transmission B When coming before scheduling DCI scrambled with C-RNTI for C, it means that PDSCH / PUSCH for B is transmitted / received before PDSCH / PUSCH for A. (Out-of-order scheduling means that for any two HARQ process IDs A and B for a given cell, if the scheduling DCI scrambled by C-RNTI for unicast PUSCH transmission A comes before (in time) the scheduling DCI scrambled by C- RNTI for unicast PUSCH transmission B, PDSCH / PUSCH for B is before the PDSCH / PUSCH for A)

At this time, out-of-order HARQ-ACK, for any two HARQ process IDs A and B for a given cell, the scheduled unicast PDSCH transmission for A comes before the unicast PDSCH transmission for B On the other hand, HARQ-ACK for B means that it is expected to be transmitted earlier than HARQ-ACK for A.

(Out-of-order HARQ-ACK means that for any two HARQ process IDs A and B for a given cell, the scheduled unicast PDSCH transmission for A comes before the scheduled unicast PDSCH transmission for B, while the HARQ-ACK for B is expected to be transmitted earlier than the HARQ-ACK for A.)

UL inter-UE Tx prioritization / multiplexing

In the case of UL, transmission for a specific type of traffic (e.g. URLLC) must be multiplexed with other previously scheduled transmissions (e.g. eMBB) to meet stringent latency requirements. Needs to be. Therefore, it is possible to give information that a predetermined resource will be pre-empted to a previously scheduled terminal, and allow the URLLC terminal to use the resource for UL transmission. Or, by scheduling resources by overlapping them to different terminals, but boosting the power of a terminal transmitting traffic corresponding to a more stringent requirement, the corresponding traffic is boosted It can also guarantee the transmission reliability for.

PDCCH enhancement

With regard to PDCCH enhancement (improvement), there is a discussion of compact DCI, PDCCH repetition and increased PDCCH monitoring capabilities.

In the existing system, since the PDCCH is designed to have a sufficiently high reliability than the PUSCH / PDSCH, the influence of the PDCCH can be very small or neglected in the reliability of the PUSCH / PDSCH.

However, when strict latency and reliability requirements such as URLLC service are considered, there is a need to increase the reliability of PUSCH / PDSCH transmission that can occur from one PDCCH transmission than that of an existing PDCCH. At this time, it is necessary to sufficiently increase the reliability of the PDCCH used in the URLLC so that the reliability of the PDCCH does not become a bottleneck.

As a solution to this, it may be possible to utilize larger resources or to transmit smaller-sized information. As an example of the former, an operation of applying a higher CCE aggregation level to a DCI transmission or performing a plurality of PDCCH transmissions for one PUSCH / PDSCH transmission may be allowed. The latter may introduce a DCI format having a bit size smaller than the bit size of the DCI used previously.

Meanwhile, the base station may set a plurality of PDDCH monitoring occasions (MOs) to one UE in one slot in order to satisfy strict latency requirements or for rapid resource allocation. According to the current NR rel-15 standard, the UE can perform only a predetermined number of channel estimation (CE) and blind decoding (BD) in one slot, even if the base station sets multiple MOs. It may be difficult for the terminal to receive the PDCCH using this. Therefore, there is a need for a method for alleviating such BD / CE limitations or performing BD / CE more efficiently within a limited number for more flexible and efficient PDCCH reception and rapid PDSCH / PUSCH reception / transmission.

PUSCH enhancement

With regard to PUSCH enhancement (improvement), there is discussion on mini-slot level hopping and retransmission / repeat improvement.

When a UE repeatedly transmits one PUSCH transmission to a base station for reliability or coverage, when the UE transmits in consecutive slots using the same resource allocation according to the NR rel-15 standard, PUSCH transmission is performed using multiple consecutive slots Need to do. This has the problem of making flexible resource allocation difficult.

In addition, when PDCCH reception and PUSCH allocation are performed in one slot to secure latency, only a few symbols in the second half of the slot are available, so that large latency may occur when repetitive transmission is performed to satisfy reliability. There is. Therefore, for more flexible and efficient resource utilization and service support, and for faster and more robust UL channel transmission, the UE repeatedly transmits PUSCH at intervals smaller than slots to support transmission of multiple PUSCHs within one slot or slot boundary. PUSCH must be able to be transmitted regardless of In addition, when a plurality of PUSCHs are transmitted in one slot, a frequency hopping method of the plurality of PUSCHs is needed to obtain reliability by obtaining frequency diversity.

Enhanced UL configured grant (grant free) transmissions

For enhanced (improved) UL set grant (without grant (approved)) transmission, an enhanced (improved) set grant operation, such as explicit HARQ-ACK, that guarantees K repetitions and mini-slot repetitions in the slot need.

When performing PUSCH transmission by a grant (acknowledgment) set according to the current NR rel-15 standard, resource allocation for one transport block (TB) should always be determined within one period of the set grant. In addition, when repetitive transmission is used to secure sufficient reliability, each repetitive transmission is to be transmitted using the same resource allocation in consecutive slots. Particularly, among a plurality of PUSCH resources within the set period, the UE can start PUSCH transmission only at a predetermined location according to a redundancy version (RV) sequence. Therefore, it is difficult to set a short period when a long time or a plurality of PUSCH resources are used to secure reliability, and it is difficult to utilize a sufficient number of repetitive transmissions, especially when starting TB transmission in the middle of a plurality of PUSCH resources set within the period. there is a problem.

Since the transmission period of the set grant (approval) is closely related to the latency of the PUSCH, it is necessary to allow the operation using the short period of the set grant (approval) regardless of the transmission length of the PUSCH. Or even when starting TB transmission in the middle of a number of PUSCH resources, it is necessary to allow an operation to perform a sufficient number of repetitive transmissions. In addition, in order to perform these operations more efficiently, it is necessary to repeatedly transmit PUSCHs at intervals shorter than slots.

In addition, when performing PUSCH transmission by the grant (approval) set according to the current NR rel-15 standard, the UE can only know whether the PUSCH transmission is successful through the UL grant (approval) for retransmission transmitted by the base station. In other words, if there is no response from the base station, the terminal assumes that the transmission is successful. If the transmission of the terminal is not confirmed from the standpoint of the base station due to a sudden channel change or the like, the terminal has a possibility to make an incorrect assumption (ie, transmission is successfully performed) for PUSCH transmission. Therefore, it is necessary for the UE to allow additional feedback signaling of the base station in order to more clearly check whether the PUSCH transmission is successful.

UL repetitive transmission method through semi-permanent scheduling

In the case of a transmission such as URLLC or traffic requiring a more stringent BLER / latency / reliability requirement, time domain repetition transmission may be required. That is, for the purpose of high reliability and / or short latency of a specific transport block (TB) / code block (CB) (group), repetitive transmission in units of TTI / slot / symbol can be applied to the corresponding channel. . The repetitive transmission may be applied to semi-persistent scheduling (SPS) or PDCCH-less channel transmission similar to SPS, may be in a form similar to TTI bundling, and UL channel to a resource set through a higher layer signal in advance considered in NR It may be applied in the form of a grant-free UL channel repetitive transmission.

When repetitive transmission is set / instructed for UL transmission for a specific TB / CB (group), open-loop power control parameters (eg, P_O, alpha) and / or TPC accumulation (accumulation) The pre-defined increase / decrease value may be set differently for each PUSCH / PUCCH repetition number. That is, the terminal may determine the final transmission power by applying an open-loop power control parameter of a different value according to the number of repeated transmissions set / instructed. As another example, the terminal may interpret a specific TPC command as a different value according to the number of repeated transmissions set / instructed.

In this specification, when a terminal is allocated resources for performing uplink or downlink transmission from a base station for URLLC (Ultra reliability and low latency communication) transmission and repeatedly uses them, a method for using the allocated resources more effectively Explain.

The next system uses a wide frequency band and aims to support various services or requirements. For example, when looking at the 3GPP's NR requirements, one of the representative scenarios is URLLC (Ultra Reliable and Low Latency Communications), which has a user plane latency of 0.5ms and data of X bytes within 10ms within 1ms. It should be transmitted within the error rate. That is, it has a requirement for high reliability with low latency. In addition, eMBB (enhanced Mobile BroadBand) generally has a large traffic capacity, whereas URLLC traffic has a different characteristic that the file size is within a few tens to hundreds of bytes and sporadic. Therefore, eMBB requires transmission that maximizes the transmission rate and minimizes the overhead of control information, and URLLC requires a short scheduling time unit and a reliable transmission method.

Depending on the application field or the type of traffic, a reference time unit assumed / used to transmit / receive a physical channel may vary. The reference time may be a basic unit for scheduling a specific physical channel, and the reference time unit is the number of symbols and / or subcarrier spacings constituting the corresponding scheduling unit. Therefore, it can be different. In the embodiments, methods, and the like described in this specification (disclosure), for convenience of description, description will be made based on a slot and a mini-slot as a reference time unit. The slot may be a basic unit of scheduling used for general data traffic (eg, eMBB). The mini-slot may have a smaller time period than the slot in the time-domain, and is used in more specific traffic or communication methods (eg, URLLC, unlicensed band, or millimeter wave). It may be a basic unit of scheduling. However, this is only an example, and it is obvious that the eMBB can extend from the idea of the present invention even when a physical channel is transmitted / received based on a mini-slot or when a URLLC or other communication technique transmits / receives a physical channel based on a slot Do.

In the present specification, the base station allocates a physical downlink shared channel (PDSCH) or a physical uplink shared channel (PUSCH) to the UE, and L1 signaling or higher repetitive transmission operation related thereto. A method for more effectively using a PDSCH or a PUSCH in which a UE and a base station are repeated when indicated or set through a higher layer parameter will be described.

Specifically, a method for determining a Demodulation Reference Signal (DMRS) symbol and an individual power control method for each repeated PDSCH / PUSCH will be described. Hereinafter, for convenience, only PUSCH is described, but it is apparent that the extension is possible from the spirit of the present invention in the case of transmission using PDSCH or other physical transport channels.

Each embodiment or each method described below may be performed in whole or in part, and a method proposed in the present specification may be implemented through a combination of all or parts of each method.

Repeated  Between resource allocation DMRS  share( DMRS  sharing among repeated resource allocation)

As described above, in the existing system, it is possible to repeatedly use the same resource allocation in order to secure higher transmission reliability. In addition, it is considered to transmit multiple PUSCHs in one slot by using symbol intervals or consecutive symbols instead of slot intervals for repetitive transmissions to reduce latency occurring in such repetitive transmissions.

A plurality of methods for determining a DMRS symbol for one PUSCH may exist. In an existing system, to determine the location of a DMRS symbol for a PUSCH or PDSCH, based on a mapping type A (mapping type A) determining a location of a DMRS symbol based on a slot boundary or a starting symbol of an allocated PUSCH Mapping type B, which determines the location of the DMRS symbol, may be used. The mapping types A and B may be determined through L1 signaling of the base station and / or configuration information transmitted through an upper layer (higher layer configuration).

When a plurality of PUSCHs are transmitted to a base station using consecutive symbols, it may be considered that DMRSs are mapped (positioned) to each PUSCH and then transmitted. However, when the UE performs PUSCH repetitive transmission using consecutive symbols, even though some PUSCHs do not include and transmit DMRSs, the base station performs channel estimation using DMRS transmitted through other PUSCHs and decodes PUSCH. ).

This can be effective in securing the reliability of the transmission because it makes it possible to secure a low coding rate by alleviating the DMRS overhead. In this case, when the UE repeatedly transmits a plurality of PUSCHs, in particular, when a plurality of PUSCHs are transmitted in one slot in consecutive symbols, the following methods may be considered.

(Method 1)

 When a UE transmits multiple PUSCHs in one slot using consecutive symbols or when a UE transmits multiple PUSCHs over multiple slots, the DMRS may be considered to be processed in the slot.

When PUSCH transmissions are considered for each slot, the UE has one time resource domain allocation equivalent to a repeated PUSCH bundle in one slot to determine the location of the DMRS in the PUSCH transmitting the DMRS. The DMRS symbol position used by the long PUSCH resource allocation can be used for the corresponding PUSCH symbol bundle. The base station can also assume the DMRS symbol of the PUSCH transmitted by the UE in the same way and perform channel estimation through this.

In other words, the UE receives the information on the DRMS location according to the PUSCH transmission using the number (size) of each symbol from the base station, and the DMRS location information on the same number of symbols (size) as the repeated PUSCH bundle in one slot. Can be applied to repeated PUSCH bundle transmission.

 For example, assuming that the PUSCH is repeated K times in the corresponding slot and the PUSCH transmitted first in the slot is the start symbol S and the length L, the UE starts the symbol of the DMRS used by the PUSCH having the start symbol S and the length L * K. Absolute or relative positions [p0, p1, ..., pn] can be applied to repeated PUSCHs, and the base station can also assume the DMRS symbol of the PUSCH transmitted by the UE in the same way and perform channel estimation through this.

Specifically, when repeatedly transmitting a PUSCH having a 2 symbol length on a slot 4 times, the UE assumes one PUSCH having an 8 symbol length (2 * 4), and the DMRS symbol used by the PUSCH having the 8 symbol length The position can be applied to the slot.

The method 1 may use the DMRS symbol location determination method applicable to one long PUSCH resource allocation with equal time resource region allocation, so that the method can determine the DMRS symbol location of another PUSCH that is not applicable.

As another example, when DMRS mapping type A is applied to a PUSCH transmitted from the start symbol of a slot, and when the PUSCH is repeatedly transmitted, the start symbol of the PUSCH repeated after the first PUSCH is the first symbol (start symbol) of the slot. No, it is difficult to apply the corresponding DMRS mapping type. At this time, using the proposed method 1, the UE performs PUSCH repetitive transmission by using the location of the DMRS symbol used when applying a corresponding DMRS mapping type to a PUSCH having a length equal to a bundle of multiple PUSCHs in a slot for multiple PUSCH bundles. Can be. The base station can also perform channel estimation by assuming the location of the DMRS symbol in the same way. This has the effect of facilitating multiplexing with the existing long duration PUSCH and simplifying the operation of the terminal when using repetitive transmission.

As another example, the DMRS mapped to the PUSCH transmitted after the first PUSCH transmission and the first PUSCH transmission may be determined differently. In the case of the first PUSCH, it can be assumed that the DMRS is mapped at any position in the slot, and at this time, the DMRS pattern configured in the configuration associated with the corresponding PUSCH transmission may be applied.

For the PUSCH transmitted after the first PUSCH, it may be considered to apply the method 1 in consideration of the previous PUSCH transmission. In this case, it can be assumed that the DMRS is transmitted only in an area overlapped with its PUSCH.

For example, the terminal may be provided with configuration information that the DMRS is located in the 1st, 4th, 7th, and 10th symbols of the slot in the base station. The PUSCH having it can be repeatedly transmitted three times.

In other words, it can be assumed that the UE transmits one PUSCH having a 12 (4 * 3) symbol length. At this time, symbols of PUSCHs transmitted after the first PUSCH, that is, symbols 5 through 12 The DRMS may be located in the 7th and 10th symbols overlapping with the configuration information provided from the base station among the 1st symbols, and this may be different from the information for determining the DMRS location located in the 1st PUSCH. have.

Further, the base station sets a separate DMRS configuration for applying the method 1 to the terminal, and the terminal can perform the method 1 by applying the DMRS setting. The DMRS setting may include RRC parameters included in DMRS-UplinkConfig, which is an existing information element such as 'dmrs-AdditionalPosition' and 'dmrs-TypeA-Position'.

This has the effect of ensuring a higher (accurate) DMRS channel estimation than a long period PUSCH or using a lower coding rate.

(Method 2)

When a UE determines a location of a specific DMRS symbol, particularly when the method determines a location of a DMRS symbol based on a start symbol of a slot, some PUSCHs or PUSCH groups repeated among slots, for example, the first PUSCH If only a method of determining a location of a DMRS symbol is applicable, the following method may be considered.

(Method 2-1) The UE and the base station determine the location of the DMRS symbol through the method only in the PUSCH or PUSCH group A to which the location of the specific DMRS symbol is applicable, and the PUSCH or PUSCH group in which the determination method is difficult to apply B, for example, after repeating, the DMSCH symbol position may be determined by using another method for PUSCH. As another method at this time, a DMRS pattern (symbol) is applied by applying a DMRS symbol positioning method determined based on a start of the scheduled PUSCH resources to a PUSCH to which the specific determination method is difficult to apply. Location).

The methods of determining the location of the DMRS symbol can be communicated by the base station to the terminal.

Through this, there is an effect that repetitive transmission in the slot can be used regardless of the method of determining the location of the DMRS symbol.

(Method 2-2) The UE and the base station determine the location of the DMRS symbol through a method of determining a specific DMRS symbol location only for PUSCH or PUSCH group A to which a method of determining a specific DMRS symbol location is applicable, and determine the specific DMRS symbol location For example, PUSCH or PUSCH group B to which the method is difficult to apply, for example, after repeated, the relative position of the DMRS symbol determined in PUSCH A can be used as it is.

For example, the location of the DMRS symbol may be determined based on a start of the slot symbol in the first PUSCH. When the determined DMRS symbol position is the first and third symbols allocated as PUSCH resources, DMRSs may be located in each of the first and third symbols of the PUSCH repeated after the first PUSCH symbol.

That is, the UE transmits DMRS on the 1st and 3rd symbols in the PUSCH allocation, and then performs DMRS transmission on each 1st and 3rd symbols of the repeated PUSCH, and the base station can assume this and perform channel estimation.

Through this, there is an effect that repetitive transmission in the slot can be used regardless of the method of determining the location of the DMRS symbol.

Although the resource allocation of the repeatedly transmitted PUSCH is continuous, some symbols may not be used due to assumptions about the slot format of the terminal or signaling of the associated base station. In this case, if some of the consecutive symbols are difficult to be used for UL transmission, the following method may be considered.

(Method 3)

When transmission of some PUSCHs is unavailable due to a slot format set through a base station, particularly when PUSCHs are transmitted using discontinuous symbols on one slot due to the slot format setting, PUSCHs transmitted using consecutive symbols Method 1 described above can be applied to each bundle as one bundle.

For example, the slot format may be set through TDD-UL-DL configuration, etc. At this time, each symbol of the set slot format may be one of a DL symbol, a UL symbol, and a flexible symbol. It may be a symbol having a. Due to this, there may be symbols that cannot be used for PUSCH transmission due to a case where UL and DL symbols are simultaneously set in one slot.

Specifically, a PUSCH having 2 symbol lengths (sizes) may be repeatedly transmitted on a slot 5 times. Depending on the slot format, the 1st to 4th symbols and the 7th to 12th symbols are symbols that can be used for PUSCH transmission. Is set, and the 5th and 6th symbols may be set as symbols that cannot be used for PUSCH transmission. At this time, the DMRS can be positioned by viewing the PUSCH using the 1st and 2nd symbols and the PUSCH using the 3rd and 4th symbols as one bundle (ie, a PUSCH having 4 symbol lengths (sizes)), and the 7th and 8th symbols The DMRS can be positioned by viewing a single PUSCH bundle (ie, a PUSCH having 6 symbol lengths (sizes)) for each PUSCH using symbols, 9th, 10th symbols, and 11th and 12th symbols.

Meanwhile, DMRS may be transmitted on each PUSCH without applying Method 1 described above.

At this time, if it is difficult to use a method for determining a DMRS symbol previously set for each PUSCH bundle or each PUSCH, the above-described method 2 may be additionally applied. In other words, when consecutive symbols capable of PUSCH transmission are divided into a plurality of PUSCH bundles by slot format setting, the UE determines the location of the DMRS symbols using Method 1 described above for each PUSCH bundle. For the PUSCH bundle, which is difficult to apply 1, the location of the DMRS symbol may be determined through the method 2 described above. The base station can also perform PUSCH channel estimation by assuming the symbol position of the DMRS in the same way.

At this time, in order to avoid possible ambiguity between the terminal and the base station, method 3 may be applied to a slot format determined using only semi-static information. In the above method 3, PUSCH repetitive transmission is performed through a discontinuous symbol, and there is an effect that a DMRS phase discontinuity that may occur when applying the above method 1 can be prevented.

(Method 4)

The above-described methods 1 to 3 are for a method in which each PUSCH repeatedly transmitting a DMRS symbol can be used for channel estimation when one PUSCH is repeatedly transmitted.

Method 4 allocates PUSCH resources to a UE through different paths, in particular, the same or different transport blocks for a plurality of PUSCHs allocated through one or more configured grants and / or dynamic grants (Transport Block, When transmitting TB) using consecutive symbols in one slot, the UE can perform PUSCH transmission by determining the location of the DMRS symbol through all or some combinations of methods 1 to 3 described above for a plurality of PUSCHs. have. At this time, the base station can also perform channel estimation for the PUSCH by assuming the location of the DMRS symbol in the same way.

(Method 5)

This is a method in which each DMRS is considered to be processed in a slot even when the UE transmits multiple PUSCHs in a single symbol in a single slot or even if the UE transmits multiple PUSCHs over multiple slots.

When these PUSCH transmissions are considered for each slot, the base station may designate a PUSCH repetition in which the terminal transmits / carryes DMRS or select a PUSCH through which the terminal transmits DMRS using a predetermined method. .

For example, the base station may be configured in the terminal so that DMRS is transmitted (included) only in the first PUSCH and the last PUSCH.

As another example, the base station may set the DMRS transmission pattern to the terminal. Specifically, as an example, when a base station sets a DMRS pattern indicating a repetition order such as [n1, n2, n3, n5] to a terminal, repetitive transmission of the first, second, third, and fifth PUSCHs Only DMRS can be transmitted. This enables the base station to control the DMRS transmission of the terminal by setting (instructing) an explicit DMRS pattern even if some PUSCHs are unavailable due to the slots of the format determined according to the slot format setting.

Due to this, the terminal can transmit the DMRS by a predetermined method, an instruction or configuration (configuration) of the base station, it is possible to lower the complexity of the terminal.

As another method, it can be assumed that a PUSCH to which Redundancy Version (RV) # 0 is mapped always carries DMRS. At this time, in case of a PUSCH other than the PUSCH to which RV # 0 is mapped, the DMRS may be omitted without including the DMRS according to a sharing option. At this time, the network may decide / set whether to omit the DMRS. When {0, 0, 0, 0} RV is used for the PUSCH transmitted by the UE, it is assumed that DMRS is located only in the first PUSCH or the above-described methods 1 to 4 can be used.

Alternatively, it may be assumed that DMRS is mapped only to the PUSCH to which the first PUSCH and RV # 0 are mapped. In this case, the DMRS pattern may follow each PUSCH mapping scheme.

Alternatively, it may be assumed that DMRSs are mapped only in PUSCHs containing RVs # 0 and # 3, or additionally, DMRSs of the first PUSCH may be assumed.

Alternatively, a DMRS sharing pattern may be given to the terminal by the base station, and the DMRS sharing pattern at this time is applied according to an absolute transmission occasion or determined according to an actually transmitted pattern Can be. At this time, when the DMRS pattern set by the network and the DMRS pattern actually transmitted by the terminal are different, since the DMRS ambiguity is obtained, a DMRS sharing pattern may be applied according to an absolute transmission occasion. When the DMRS sharing pattern at this time is a pattern that does not transmit sufficient DMRS, the terminal may disable DMRS sharing.

As an example of a condition for the DMRS sharing to be disabled, a PUSCH that transmits DMRS has a slot format indicator (SFI) and / or downlink control information (DCI). ) May be canceled or dropped due to a resource that cannot be used for DMRS transmission, etc., and there may be a minimum m (eg, 1) or more times during PUSCH repetition transmission.

In addition, a PUSCH that needs to transmit DMRS to reduce or eliminate ambiguity between a terminal and a network is considered valid when mapped to a semi-static UL resource and / or a flexible resource. On the other hand, if an invalid case occurs more than m (eg, 1) times, the DMRS sharing pattern may be disabled. In this case, the flexible resource may be counted only when dynamic SFI is not configured. At this time, even if PUSCH transmission is set by the dynamic setting, it may be regarded as an invalid case.

Repeated  Transmit power control among repeated resource allocation

As described above, in the existing system, it is possible to repeatedly use the same resource allocation to ensure high transmission reliability.

In order to reduce the latency that occurs in such repetitive transmission, it is necessary to transmit multiple PUSCHs within one slot by using repetitive symbols or symbol intervals instead of slot intervals.

In performing PUSCH repetitive transmission, a method for dynamically indicating the number of PUSCH repetitive transmissions is required. If the operation of dynamically indicating / setting the number of PUSCH repetitions is allowed, the base station may indicate / set the number of PUSCH repetitive transmissions at the same time as the PUSCH resource allocation to the UE through L1 signaling.

At this time, the base station may select the size and modulation and coding method of the PUSCH resource allocation (Modulation and Coding Scheme, MCS) in consideration of the number of PUSCH repetitive transmissions. In addition, when considering PUSCH repetitive transmission, the transmission power of the terminal may be determined according to the number of repetitive transmissions.

Hereinafter, a detailed method of determining the transmission power of the terminal will be described.

(Method 6)

When the base station instructs or sets the number of PUSCH repetition transmissions through the L1 signaling or higher layer parameters to the terminal, the base station is preset for transmissions corresponding to the group consisting of each transmission of the PUSCH repetition transmission or a part of the repetition transmission. A separate power control parameter is set, and the terminal can use this to allocate independent power for each transmission (group) to perform transmission.

The power control parameter may be a power offset value determined based on a case in which the number of repetitive transmissions is 1 or similar to an existing power control parameter, such as receiving parameters p0 and alpha, respectively.

Alternatively, a closed loop process may be set differently for each repetition transmission. For example, in the case of different beams or transmission in multi-Tx / Rx Points (TRPs), the closed loop process may be set differently. The closed loop process may be set differently when setting resources (e.g., the TPC (Trnasmit Power Control) process and / or parameters for each resource may be set separately), and the closed loop process may be set differently according to the number of PUSCH repetitive transmissions, RV Depending on the value, the closed loop process may be set differently.

(Method 7)

 When the base station instructs or sets the number of PUSCH repetitive transmissions through the L1 signaling or higher layer parameters to the terminal, the terminal controls the transmission power of each PUSCH transmission to a specific ratio value in consideration of the number K of repetitive transmissions. can do. At this time, a specific ratio may be K * alpha, and alpha may be a value that the base station instructs or sets to the UE through L1 signaling or higher layer parameters.

In the above-described methods 6 and 7, the transmission power is scaled in the repetitive transmission situation of the PUSCH so that the total power consumption used for one PUSCH is similar regardless of the number of PUSCH repetitive transmissions. In particular, when a plurality of PUSCH repetitive transmissions are used in one slot, a short duration PUSCH is transmitted with high power and a long duration PUSCH is transmitted with low power through a corresponding method. Control (dynamic power control) can be performed.

The above-described methods 6 and 7 have an effect that efficient power control is possible when a large amount of power control is required for UL multiplexing in an inter-UE situation.

In performing PUSCH repetition transmission, some of the PUSCH resources used for PUSCH repetition transmission may be allocated on PUSCH resources used by other terminals in order to satisfy a URLLC requirement. Similarly, PUSCH resources used for repetitive transmission may be allocated on PUSCH resources used by other terminals. At this time, in order to secure reliability of a specific PUSCH, it is necessary to increase the transmission power of a specific PUSCH or reduce the transmission power of other overlapped PUSCHs.

Hereinafter, a method of controlling the transmission power of the overlapped (overlapping) PUSCH will be described.

(Method 8)

 The base station instructs or sets the number of PUSCH repetition transmissions through the L1 signaling or higher layer parameters to the UE, and at the same time, transmits a power transmission offset (transmit power offset) that can be applied to some PUSCH repetition transmissions to the UE L1 signaling or higher layer It can be indicated or set through parameters.

Some PUSCH repetitive transmissions to which a transmission power offset is applied may also be predefined in the form of an index set or pattern of repetitive transmissions, or may be indicated or set to the terminal through L1 signaling or higher layer parameters. When performing the PUSCH repetitive transmission, the UE may determine the transmission power of each PUSCH based on the indication / setting information received from the base station.

(Method 9)

The base station instructs or sets the number of PUSCH repetitive transmissions through the L1 signaling or higher layer parameters to the UE, and at the same time, the L1 signaling or higher layer to the UE to transmit power offset that can be additionally or separately applied to a specific time and / or frequency domain. It can be indicated or set through parameters.

When the UE performs PUSCH repetition transmission, when transmission corresponding to each transmission or group consisting of a part of repetition transmission is performed on a resource element included in a specific time and / or frequency domain, transmission A power offset of the PUSCH may be determined by applying a power offset to the PUSCH transmission.

For example, when the network is configured for a configured resource for a configured grant (short periodicity) in a terminal, a transmission power is high in a configured grant in consideration of multiplexing with eMBB data. Can be set.

However, this method has a problem in that power consumption of the terminal can be increased and inter-cell interference may be caused. Therefore, when the base station schedules a potential eMBB / URLLC multiplexing or configured grant resource to another terminal as a UL grant, it is unnecessary for all configured grant resources to ensure reliability. Rather than setting a high power, it is possible to control transmission power by dividing the resource into types and dividing the resource into a resource having a high probability of being multiplexed with a UL grant among configured grant resources.

In other words, a transmission power may be set high for a resource having a high possibility of multiplexing and a transmission power may be set low for a resource not otherwise. Therefore, even if multiplexing is performed, when URLLC transmission occurs, the reliability of URLLC may not be impaired, the possibility of multiplexing may be increased, and inter-cell interference may be reduced. In addition, different powers may be set for each slot, PUSCH resource, or frequency domain. At this time, there may be a parameter for setting the power, and this parameter may be a power parameter potentially including a TPC process ID.

The UE may receive a parameter for transmission power control in a specific time / frequency resource region from a base station or a specific time / frequency resource region in which a separate offset and transmission power will be controlled.

When a specific time / frequency resource region received from the base station overlaps with a preset resource, the terminal may control the transmission power of the specific resource region using the parameter or offset. For example, a specific time / frequency resource can be notified to the UE for PUSCH transmission for URLLC transmission, and if this specific time / frequency resource overlaps with a resource for eMBB transmission, the UE receives a specific time / frequency resource received from the base station. The transmission can be performed by increasing the transmission power of all regions or by increasing the transmission power only in the overlapping resource region. Due to this, URLLC reliability can be secured.

At this time, the transmission power of a specific time / frequency resource may be determined / calculated using a parameter or offset received from the base station.

That is, when the UE normally operates in a low mode, and when a specific resource region to which high transmission power is applied is set by the base station, the UE can change to the high mode to perform PUSCH transmission.

Allocating recurring resources Precoder / Beam cycling ( Precoder / beam cycling among repeated resource allocation)

As described above, in the existing system, it is possible to repeatedly use the same resource allocation for PUSCH transmission in order to secure higher transmission reliability. In addition, in order to secure reliability in various aspects of such repetitive transmission, a different precoder and a different beam may be used for each repetitive transmission.

(Method 10)

In the PUSCH repetitive transmission, the base station can explicitly indicate or set the precoder / beam to be used for each PUSCH transmission to the UE.

At this time, in order to reduce signaling overhead, a sequence / pattern of one or a plurality of precoders / beams to be used for each repetitive transmission may be predefined or set by the base station to the terminal. At this time, when a plurality of precoder / beam sequences are set, the base station may indicate or set a sequence of one precoder / beam through L1 signaling and / or higher layer signaling (eg, TPMI field of DCI).

This method may vary depending on the number of PUSCH repetitive transmissions indicated or set to the UE. For example, when the number of PUSCH repetitions is indicated or set to 1, when the number of repetitions is not indicated or set, when the number of repetitions of PUSCH is indicated or set to a value greater than 1, simply the number of repetitions is set In each case, the terminal may refer to different table / configuration in interpreting values such as the TPMI field indicated at the time of resource allocation. In other words, the UE may refer to different upper layer parameter sets for precoder / beam selection when PUSCH repetition is indicated or set and not set.

(Method 11)

When the precoder / beam to be used for each PUSCH of PUSCH repetitive transmission is explicitly indicated or set by the base station to the terminal, the order of repetitive transmission may be considered.

When the UE performs repetitive transmission, some PUSCH repetitive transmissions may be excluded according to a configuration or instruction of a base station such as TDD configuration. When some repetitive transmissions are excluded, when a sequence / pattern of a precoder / beam is given from a base station, when a terminal applies a sequence / pattern of a precoder / beam, the UE applies a sequence / pattern except for the excluded PUSCH transmission. Can be.

This is an effect that when a terminal applies a sequence / pattern of a precoder / beam, it is possible to prevent a specific value in the pattern from being continuously excluded, thereby ensuring a terminal operation suitable for the purpose of precoder / beam cycling. There is.

The terminal / base station described in this specification can be applied by being replaced with various devices as illustrated in FIGS. 5 to 9.

27 is a flowchart illustrating an example of a terminal operation method for performing a DMRS location determination method on a physical shared channel proposed in this specification.

First, the terminal receives format information of a slot for transmitting the first data and the second data from the base station (S2710).

At this time, the format information of the slot may include information on a plurality of symbols capable of transmitting the first data and the second data.

In addition, the terminal receives configuration information including mapping information from the base station (S2720),

The terminal uses each of the first physical shared channel group composed of a plurality of first physical shared channels and the second physical shared channel group composed of a plurality of second physical shared channels as the base station, based on the format information of the slot. To transmit the first data and the second data (S2730).

At this time, each of the plurality of first physical shared channels and the plurality of second physical shared channels may be continuous on the time domain.

Each of the first physical shared channel group and the second physical shared channel group may be discontinuous in the time domain.

Each of the first physical shared channel group and the second physical shared channel group may be mapped to a first DMRS and a second DMRS using the mapping information, wherein the mapping information is the first physical shared channel. The number of symbols equal to the number of symbols constituting the second physical shared channel group and the information for mapping the third DMRS for the third physical shared channel consisting of the same number of symbols as the number of symbols constituting the group. It may include information for mapping the fourth DMRS for the configured fourth physical shared channel.

The first data and the second data may be transmitted on one slot.

The format information of the slot may be scheduled semi-statically.

The mapping information may be information based on Redundancy Version (RV).

When the first data and the second data are transmitted on a plurality of slots, the mapping information may include information about a location of a specific slot to which the first DMRS and the second DMRS are mapped. .

Different precoders and beams may be applied to the first data and the second data.

The mapping information may include information on a location of a specific symbol to which the first DMRS and the second DMRS are mapped.

A terminal device performing a method of determining a location of a dedicated demodulation-reference signal (DMRS) on a physical shared channel in a wireless communication system proposed in this specification with reference to FIGS. 5 to 9 will be described.

At this time, the terminal device is a transceiver for transmitting and receiving a wireless signal (transceiver); And a processor functionally connected to the transceiver.

First, the processor of the terminal controls the transceiver to receive format information of a slot for transmitting the first data and the second data from the base station.

At this time, the format information of the slot may include information on a plurality of symbols capable of transmitting the first data and the second data.

The processor of the terminal controls the transceiver to receive configuration information including mapping information from the base station.

The processor of the terminal is the base station, each of a first physical shared channel group composed of a plurality of first physical shared channels and a second physical shared channel group composed of a plurality of second physical shared channels based on the format information of the slot, respectively The transceiver is controlled to transmit the first data and the second data using.

At this time, each of the plurality of first physical shared channels and the plurality of second physical shared channels may be continuous on the time domain.

In addition, the first physical shared channel group and the second physical shared channel group may be discontinuous in the time domain, respectively.

In each of the first physical shared channel group and the second physical shared channel group, a first DMRS and a second DMRS are respectively mapped using the mapping information, wherein the mapping information is the first physical shared channel group. Information for mapping a third DMRS for a third physical shared channel, which is composed of the same number of symbols as the number of symbols, and symbols that are the same number of symbols that make up the second physical shared channel group. It may include information for mapping the fourth DMRS for the fourth physical shared channel.

The first data and the second data may be transmitted on one slot.

The format information of the slot may be scheduled semi-statically.

The mapping information may be information based on Redundancy Version (RV).

When the first data and the second data are transmitted on a plurality of slots, the mapping information may include information about a location of a specific slot to which the first DMRS and the second DMRS are mapped. .

Different precoders and beams may be applied to the first physical shared channel group and the second physical shared channel group.

Different precoders and beams may be applied to the first data and the second data.

28 is a flowchart illustrating an example of a method of operating a base station performing a DMRS location determination method of a physical shared channel resource proposed in the present specification.

First, the base station transmits format information of a slot related to a resource for transmitting the first data and the second data to the terminal (S2810).

At this time, the format information of the slot may include information on a plurality of symbols capable of transmitting the first data and the second data.

The base station transmits configuration information including mapping information to the terminal (S2820).

The base station uses each of the first physical shared channel group composed of a plurality of first physical shared channels and the second physical shared channel group composed of a plurality of second physical shared channels from the terminal, based on the format information of the slot. And receive the first data and the second data transmitted (S2830).

At this time, each of the plurality of first physical shared channels and the plurality of second physical shared channels may be continuous on the time domain.

In addition, the first physical shared channel group and the second physical shared channel group may be discontinuous in the time domain, respectively.

Each of the first physical shared channel group and the second physical shared channel group is mapped with a first DMRS and a second DMRS using the mapping information, and the mapping information constitutes the first physical shared channel group. Information for mapping a third DMRS for a third physical shared channel composed of the same number of symbols as the number of symbols and a fourth symbol composed of the same number of symbols constituting the second physical shared channel group It may include information for mapping the fourth DMRS for the physical shared channel.

Referring to FIGS. 5 to 9, a description will be given of a base station apparatus performing a method of determining a location of a dedicated demodulation-reference signal (DMRS) on a physical shared channel for data transmission proposed herein.

At this time, the base station apparatus is a transceiver for transmitting and receiving a radio signal (transceiver); And a processor functionally connected to the transceiver.

First, the processor of the base station controls the transceiver to transmit format information of a slot for transmitting the first data and the second data to the terminal.

At this time, the format information of the slot may include information on a plurality of symbols capable of transmitting the first data and the second data.

The processor of the base station controls the transceiver to transmit configuration information including mapping information to the terminal.

The processor of the base station, from the terminal, based on the format information of the slot, each of a first physical shared channel group composed of a plurality of first physical shared channels and a second physical shared channel group composed of a plurality of second physical shared channels, respectively The transceiver is controlled to receive the first data and the second data transmitted using.

At this time, each of the plurality of first physical shared channels and the plurality of second physical shared channels may be continuous on the time domain.

In addition, the first physical shared channel group and the second physical shared channel group may be discontinuous in the time domain, respectively.

Each of the first physical shared channel group and the second physical shared channel group is mapped with a first DMRS and a second DMRS using the mapping information, and the mapping information constitutes the first physical shared channel group. Information for mapping a third DMRS for a third physical shared channel composed of the same number of symbols as the number of symbols and a fourth symbol composed of the same number of symbols constituting the second physical shared channel group It may include information for mapping the fourth DMRS for the physical shared channel.

Although the above-described method or operation of the invention has been described in terms of "terminal" or "base station", it is performed or implemented by a transmitting or receiving device, a (digital signal) processor, a microprocessor, etc., described below instead of "terminal" and "base station". Can be. In addition, "terminal" is a general term, and is used interchangeably with a mobile device such as a mobile station (MS), a user equipment (UE), or a mobile terminal, and "base station" is a general term, and a base station (BS). , eNB (evolved NodeB), ng-eNB (next generation eNode B), gNB (next generation NodeB) and the like can be used interchangeably.

It is obvious that examples of the above-described proposed method may also be included as one of the implementation methods of the present invention, and thus may be regarded as a kind of proposed methods. In addition, the proposed method may be implemented independently, but may be implemented in a combination (or merge) form of some proposed methods. The rule may be defined such that information on whether to apply the proposed methods (or information on the rules of the proposed methods) is notified by the base station to a terminal through a predefined signal (eg, a physical layer signal or a higher layer signal). In addition, the proposed method described in the methods of the present invention and methods that can be extended from the method may be implemented as an apparatus, and the present invention also includes a description of an apparatus implementing the proposed method. The description of the device is as described above.

The embodiments described above are those in which components and features of the present invention are combined in a predetermined form. Each component or feature should be considered optional unless stated otherwise. Each component or feature may be implemented in a form that is not combined with other components or features. In addition, it is also possible to configure an embodiment of the present invention by combining some components and / or features. The order of the operations described in the embodiments of the present invention can be changed. Some configurations or features of one embodiment may be included in other embodiments, or may be replaced with corresponding configurations or features of other embodiments. It is apparent that claims that do not have an explicit citation relationship in the claims can be combined to form an embodiment or included as a new claim by correction after filing.

Embodiments according to the present invention may be implemented by various means, for example, hardware, firmware, software, or a combination thereof. For implementation by hardware, one embodiment of the invention is one or more application specific integrated circuits (ASICs), digital signal processors (DSPs), digital signal processing devices (DSPDs), programmable logic devices (PLDs), FPGAs ( field programmable gate arrays), processors, controllers, microcontrollers, microprocessors, and the like.

In the case of implementation by firmware or software, an embodiment of the present invention may be implemented in the form of a module, procedure, function, etc. that performs the functions or operations described above. The software code can be stored in memory and driven by a processor. The memory is located inside or outside the processor, and can exchange data with the processor by various known means.

It is apparent to those skilled in the art that the present invention may be embodied in other specific forms without departing from the essential features of the present invention. Therefore, the above detailed description should not be construed as limiting in all respects and should be considered illustrative. The scope of the present invention should be determined by rational interpretation of the appended claims, and all changes within the equivalent scope of the present invention are included in the scope of the present invention.

The present invention has been mainly described as an example applied to the 3GPP LTE / LTE-A / NR system, but it can be applied to various wireless communication systems in addition to the 3GPP LTE / LTE-A / NR system.

Claims (15)

1. A method for determining a location of a DMRS (dedicated demodulation-reference signal) on a physical shared channel for data transmission in a wireless communication system, the method performed by the terminal,

   Receiving the format information of the slot for transmitting the first data and the second data from the base station,

   The format information of the slot includes information on a plurality of symbols capable of transmitting the first data and the second data,

   Receiving configuration information including mapping information from the base station; And

   The base station using the first physical shared channel group composed of a plurality of first physical shared channels and a second physical shared channel group composed of a plurality of second physical shared channels based on the format information of the slot, respectively. Transmitting the first data and the second data;

   Each of the plurality of first physical shared channels and the plurality of second physical shared channels is continuous on a time domain, and

   Each of the first physical shared channel group and the second physical shared channel group is discontinuous in the time domain,

   A first DMRS and a second DMRS are respectively mapped to the first physical shared channel group and the second physical shared channel group using the mapping information,

   The mapping information comprises information for mapping a third DMRS for a third physical shared channel composed of symbols equal to the number of symbols constituting the first physical shared channel group and the second physical shared channel group And a method for mapping a fourth DMRS for a fourth physical shared channel composed of the same number of symbols as the number of symbols.
2. According to claim 1,

   The method of claim 1, wherein the first data and the second data are transmitted on one slot.
3. According to claim 1,

   The method of claim 1, wherein the format information of the slot is semi-statically scheduled.
4. According to claim 1,

   The mapping information is a method based on Redundancy Version (RV).
5. According to claim 1,

   When the first data and the second data are transmitted on a plurality of slots,

   The mapping information, wherein the first DMRS and the second DMRS is characterized in that it comprises information about the location of a specific slot to be mapped.
6. According to claim 1,

   A method according to claim 1, wherein different precoders and beams are applied to the first data and the second data.
7. According to claim 1,

   The mapping information, wherein the first DMRS and the second DMRS method characterized in that it comprises information about the location of a specific symbol is mapped.
8. In the terminal performing a method for determining a location of a DMRS (dedicated Demodulation-Reference Signal) on a physical shared channel for data transmission in a wireless communication system,

   A transceiver for transmitting and receiving wireless signals; And

   It includes a processor functionally connected to the transceiver, the processor,

   To receive format information of the slot for transmitting the first data and the second data from the base station,

   The format information of the slot includes information on a plurality of symbols capable of transmitting the first data and the second data,

   Receiving configuration information including mapping information from the base station,

   The base station using the first physical shared channel group composed of a plurality of first physical shared channels and a second physical shared channel group composed of a plurality of second physical shared channels based on the format information of the slot, respectively. Transmitting the first data and the second data,

   Each of the plurality of first physical shared channels and the plurality of second physical shared channels is continuous on a time domain,

   Each of the first physical shared channel group and the second physical shared channel group is discontinuous in the time domain,

   A first DMRS and a second DMRS are respectively mapped to the first physical shared channel group and the second physical shared channel group using the mapping information,

   The mapping information comprises information for mapping a third DMRS for a third physical shared channel composed of symbols equal to the number of symbols constituting the first physical shared channel group and the second physical shared channel group A terminal comprising information for mapping a fourth DMRS for a fourth physical shared channel composed of the same number of symbols as the number of symbols.
9. The method of claim 8,

   The terminal characterized in that the first data and the second data are transmitted on one slot (slot).
10. The method of claim 8,

    The terminal, characterized in that the format information of the slot is semi-static (semi-static) scheduled.
11. The method of claim 8,

    The mapping information, the terminal characterized in that the information based on the Redundancy Version (RV).
12. The method of claim 8,

    When the first data and the second data are transmitted on a plurality of slots,

    The mapping information, the terminal comprising the information on the location of a specific slot to which the first DMRS and the second DMRS is mapped.
13. The method of claim 8,

    A terminal characterized in that different precoders and beams are applied to the first physical shared channel group and the second physical shared channel group.
14. The method of claim 8,

    A terminal characterized in that different precoders and beams are applied to the first data and the second data.
15. A method for determining a location of a demodulation-reference signal (DMRS) on a physical shared channel for data transmission in a wireless communication system, the method performed by the base station,

    Transmitting the format information of the slot for transmitting the first data and the second data to the terminal,

    The format information of the slot includes information on a plurality of symbols capable of transmitting the first data and the second data,

    Transmitting, to the terminal, configuration information including mapping information; And

    Transmission from the terminal using each of a first physical shared channel group composed of a plurality of first physical shared channels and a second physical shared channel group composed of a plurality of second physical shared channels based on the format information of the slot Receiving the first data and the second data;

    Each of the plurality of first physical shared channels and the plurality of second physical shared channels is continuous on a time domain, and

    Each of the first physical shared channel group and the second physical shared channel group is discontinuous in the time domain,

    A first DMRS and a second DMRS are respectively mapped to the first physical shared channel group and the second physical shared channel group using the mapping information,

    The mapping information comprises information for mapping a third DMRS for a third physical shared channel composed of symbols equal to the number of symbols constituting the first physical shared channel group and the second physical shared channel group And a method for mapping a fourth DMRS for a fourth physical shared channel composed of the same number of symbols as the number of symbols.

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