Method and device for sending uplink signal based on codebook in wireless communication system

Abstract

The present specification relates to a method and device for transmitting uplink data based on a codebook in a wireless communication system. According to the present specification, a method is disclosed in which a terminal performs the following steps: receiving downlink control information (DCI) for determining a precoding matrix to be applied to uplink signal transmission from a base station; determining the precoding matrix to be applied to uplink signal transmission from a codebook subset related to uplink signal transmission based on the DCI; and transmitting an uplink signal to the base station based on the determined precoding matrix, wherein the codebook subset includes at least one specific precoding matrix for full power transmission based on a change in a difference between phase values ​​applied to antenna ports for uplink signal transmission in each antenna port pair.

Description

Technical Field

[0001] The present disclosure relates to a wireless communication system, and more particularly, to a method and device for transmitting an uplink signal based on a codebook in a wireless communication system. Background Art

[0002] Mobile communication systems have been developed to ensure user activity while providing voice services. Mobile communication systems are expanding their services from voice only to data. The current surge in data traffic is exhausting resources and user demand for higher data rate services has led to the need for more advanced mobile communication systems.

[0003] The next generation of mobile communication systems needs to meet requirements such as handling explosively growing data traffic, significantly increasing the transmission rate per user, working with a large number of connected devices, and supporting very low end-to-end latency and high energy efficiency. To this end, various research efforts are being conducted on various technologies such as dual connectivity, massive multiple-input multiple-output (MIMO), in-band full-duplex, non-orthogonal multiple access (NOMA), ultra-wideband support, and device networking. Summary of the invention

[0004] Technical issues

[0005] The present disclosure provides a method for transmitting an uplink signal based on a codebook in a wireless communication system and an apparatus thereof.

[0006] The present disclosure also provides a method for transmitting an uplink signal based on a codebook subset supporting full-power transmission based transmission and an apparatus thereof.

[0007] The technical objectives of the present disclosure are not limited to the above-mentioned technical objectives, and other technical objectives not mentioned above will be obviously understood by ordinary technicians in the field from the following description.

[0008] Technical Solution

[0009] In order to solve the above problems, the present disclosure provides a method and apparatus for performing uplink signal transmission through previously configured uplink resources in a wireless communication system.

[0010] In more detail, the method for a UE to send an uplink signal based on a codebook in a wireless communication system disclosed in the present invention includes the following steps: receiving downlink control information (DCI) from a base station for determining a precoding matrix applied to uplink signal transmission; determining the precoding matrix applied to uplink signal transmission from a codebook subset related to uplink signal transmission based on the DCI; and sending an uplink signal to the base station based on the determined precoding matrix, wherein the codebook subset includes at least one specific precoding matrix for full-power transmission based on a difference change in a phase value applied to an antenna port for sending the uplink signal in all antenna port pairs.

[0011] Furthermore, based on the determined precoding matrix being one of the at least one specific precoding matrix, an uplink signal is transmitted based on full power transmission.

[0012] Furthermore, based on the determined precoding matrix being one of the at least one specific precoding matrix, the uplink signal is transmitted through all antenna ports for transmitting the uplink signal.

[0013] In addition, the method also includes the following steps: determining an uplink transmission power for uplink transmission based on the DCI, wherein the DCI also includes information about an optimal power level for uplink transmission, and dividing the determined uplink transmission power into the same value across all antenna ports used to send uplink signals and applying it.

[0014] In addition, the codebook includes a first codebook for rank 1 for sending uplink signals using two antenna ports and a second codebook for rank 2 for sending uplink signals using two antenna ports, a codebook subset is configured based on precoding matrices respectively included in the first codebook and the second codebook, and among the first precoding matrix set of rank 1 and the second precoding matrix set of rank 2 included in the codebook subset, the at least one specific precoding matrix is ​​included in the first precoding matrix set.

[0015] In addition, precoding matrices respectively included in the first codebook and the second codebook are indexed by TPMI (Transmit Precoding Matrix Indicator) indexes.

[0016] In addition, the first codebook is determined by the following table,

[0017] [surface]

[0018]

[0019] Wherein, for the precoding matrices included in the first codebook, the TPMI indexes are indexed in ascending order from left to right in the table.

[0020] In addition, the at least one specific precoding matrix is ​​a precoding matrix having a TPMI index of 2 among the precoding matrices included in the first codebook.

[0021] In addition, the codebook also includes (i) a first codebook related to rank 1 for sending an uplink signal using four antenna ports, (ii) a second codebook related to rank 2 for sending an uplink signal using four antennas, (iii) a third codebook related to rank 3 for sending an uplink signal using four antennas, and (iv) a fourth codebook for sending an uplink signal using four antenna ports, and the codebook set is configured based on a precoding matrix included in each of the first to fourth codebooks.

[0022] In addition, the at least one specific precoding matrix includes precoding matrices applied to rank 1, rank 2 and rank 3, respectively, and among (i) a first precoding matrix set of rank 1 included in the codebook set, (ii) a second precoding matrix set of rank 2, (iii) a third precoding matrix set of rank 3 and (iv) a fourth precoding matrix set of rank 4, for each rank, the at least one specific precoding matrix is ​​included in the first precoding matrix set of rank 1, the second precoding matrix set of rank 2 and the third precoding matrix set of rank 3.

[0023] Furthermore, the precoding matrix included in each of the first to fourth codebooks is indexed by a TPMI index.

[0024] Furthermore, the first codebook is determined by one of the following tables.

[0025] [surface]

[0026]

[0027] [surface]

[0028]

[0029]

[0030] The second codebook is determined by the following table,

[0031] [surface]

[0032]

[0033] The third codebook is determined by the following table,

[0034] [surface]

[0035]

[0036]

[0037] Wherein, for the precoding matrix included in each of the first codebook, the second codebook, and the third codebook, the TPMI index is indexed in ascending order from left to right in the table.

[0038] In addition, the precoding matrix applied to rank 1 in the precoding matrix included in the at least one specific precoding matrix is ​​a precoding matrix with a TPMI index of 13 included in the precoding matrix in the first codebook, the precoding matrix applied to rank 2 in the precoding matrix included in the at least one specific precoding matrix is ​​a precoding matrix with a TPMI index of 6 included in the precoding matrix in the second codebook, and the precoding matrix applied to rank 3 in the precoding matrix included in the at least one specific precoding matrix is ​​a precoding matrix with a TPMI index of 1 included in the precoding matrix in the third codebook.

[0039] In addition, the method further includes the step of receiving configuration information on a maximum rank value for uplink signal transmission from a base station, wherein a first precoding matrix set included in the codebook subset is differently configured based on the maximum rank value.

[0040] In addition, based on the maximum rank value being 1, the precoding matrix applied to rank 1 among the precoding matrices included in the at least one specific precoding matrix is ​​a precoding matrix having a TPMI index of 12 to 15 among the precoding matrices included in the first codebook.

[0041] In addition, the UE of the present disclosure that sends an uplink signal based on a codebook in a wireless communication system includes: a transmitter, which is used to send a radio signal; a receiver, which is used to receive a radio signal; and a processor, which is functionally connected to the transmitter and the receiver, wherein the processor controls the receiver to receive downlink control information (DCI) from the base station for determining a precoding matrix applied to uplink signal transmission, and determines the precoding matrix applied to uplink signal transmission from a codebook subset related to uplink signal transmission based on the DCI; and controls the transmitter to send an uplink signal to the base station based on the determined precoding matrix, wherein the codebook subset includes at least one specific precoding matrix for full power transmission based on the difference change of the phase value applied to the antenna port used to send the uplink signal in all antenna port pairs in the UE.

[0042] In addition, the method for receiving an uplink signal based on a base station codebook in a wireless communication system disclosed in the present invention includes the following steps: sending downlink control information (DCI) for determining a precoding matrix applied to uplink signal transmission to a UE; and receiving an uplink signal from the UE according to the precoding matrix determined based on the DCI, wherein, based on a difference change in a phase value applied to an antenna port for sending an uplink signal in all antenna port pairs in the UE, the codebook subset includes at least one specific precoding matrix for full power transmission.

[0043] In addition, the base station for receiving uplink signals based on a codebook in a wireless communication system of the present invention includes: a transmitter for sending a radio signal; a receiver for receiving a radio signal; and a processor, which is functionally connected to the transmitter and the receiver, and the processor controls the transmitter to send downlink control information (DCI) to the UE for determining a precoding matrix applied to uplink signal transmission; and controls the receiver to receive an uplink signal from the UE according to the precoding matrix determined based on the DCI, wherein, based on the difference change in the phase value applied to the antenna port for sending the uplink signal in all antenna port pairs, the codebook subset includes at least one specific precoding matrix for full power transmission.

[0044] In addition, the device of the present disclosure includes one or more memories and one or more processors functionally connected to the one or more memories, wherein the one or more processors control the device to receive downlink control information (DCI) from a base station for determining a precoding matrix applied to uplink signal transmission; determine the precoding matrix applied to uplink signal transmission from a codebook subset related to uplink signal transmission based on the DCI; and send an uplink signal to the base station based on the determined precoding matrix, wherein the codebook subset includes at least one specific precoding matrix for full power transmission based on the difference change in phase values ​​applied to antenna ports used to send uplink signals in all antenna port pairs.

[0045] In addition, the present disclosure provides a non-temporary CRM (computer-readable medium) storing one or more commands, wherein the one or more commands executable by one or more processors enable the UE to receive downlink control information (DCI) from a base station for determining a precoding matrix applied to uplink signal transmission; determine the precoding matrix applied to uplink signal transmission from a codebook subset related to uplink signal transmission based on the DCI; and send an uplink signal to the base station based on the determined precoding matrix, wherein the codebook subset includes at least one specific precoding matrix for full power transmission based on the difference change in phase values ​​applied to antenna ports used to send uplink signals in all antenna port pairs.

[0046] Beneficial Effects

[0047] In the present disclosure, there is an effect that an uplink signal can be transmitted based on a codebook in a wireless communication system.

[0048] Furthermore, in the present disclosure, there is an effect that an uplink signal can be transmitted based on a codebook subset supporting transmission based on full-power transmission.

[0049] Furthermore, in the present disclosure, there is an effect that a non-coherent UE may transmit an uplink signal based on a codebook subset that supports transmission based on full power transmission.

[0050] Furthermore, in the present disclosure, there is an effect that a partially coherent UE may transmit an uplink signal based on a codebook subset that supports transmission based on full power transmission.

[0051] Advantages obtainable in the present disclosure are not limited to the above-mentioned advantages, and other unmentioned advantages will be clearly understood by those skilled in the art from the following description. BRIEF DESCRIPTION OF THE DRAWINGS

[0052] The accompanying drawings are included as a part of the detailed description in order to provide a thorough understanding of the present disclosure, and provide embodiments of the present disclosure and describe technical features of the present disclosure together with the description.

[0053] Figure 1 is a diagram showing an example of an overall system structure of NR to which the method proposed in the present disclosure can be applied.

[0054] Figure 2 The relationship between an uplink frame and a downlink frame in a wireless communication system to which the method proposed in the present disclosure is applicable is shown.

[0055] Figure 3 An example of a frame structure in an NR system is shown.

[0056] Figure 4 An example of a resource grid supported by a wireless communication system to which the method proposed in the present disclosure is applicable is shown.

[0057] Figure 5 An example of a resource grid and a parameter set for each antenna port to which the method proposed in the present disclosure is applicable is shown.

[0058] Figure 6 The SSB structure is shown.

[0059] Figure 7 An SSB transmission is shown.

[0060] Figure 8 It shows that the UE acquires information about DL time synchronization.

[0061] Fig. 9 Shows physical signals and general signal transmission used in the 3GPP system.

[0062] Fig.10 is a diagram showing an example of beams used for beam management.

[0063] Fig.11 is a flow chart illustrating an example of a downlink beam management process.

[0064] Fig.12 An example of a downlink beam management procedure using a channel state information reference signal is shown.

[0065] Fig.13 is a flow chart illustrating an example of a receive beam determination process of a UE.

[0066] Fig.14 is a flowchart illustrating an example of a transmit beam determination process of a BS.

[0067] Fig.15 An example of resource allocation in the time domain and the frequency domain related to the DL BM process using CSI-RS is shown.

[0068] Fig.16 An example of an uplink beam management procedure using a sounding reference signal (SRS) is shown.

[0069] Fig.17 is a flow chart illustrating an example of an uplink beam management process using SRS.

[0070] Fig.18 is a flowchart illustrating an example of a CSI-related process to which the method proposed in the present disclosure can be applied.

[0071] Fig.19 is a diagram showing an example of a downlink transmission / reception operation between a BS and a UE.

[0072] Fig. 20 is a diagram showing an example of uplink transmission / reception operations between a BS and a UE.

[0073] Fig.21 is a diagram showing an example of a configuration scheme of a Tx chain of a UE.

[0074] Fig. 22 is a flowchart illustrating an example of operations implemented in a UE that performs the method for transmitting an uplink signal based on a codebook in a wireless communication system proposed in the present disclosure.

[0075] Fig.23 is a flowchart illustrating an example of operations implemented in a BS that performs a method for a UE to transmit an uplink signal based on a codebook in a wireless communication system proposed in the present disclosure.

[0076] Fig.24 is a diagram showing an example of an uplink transmission signaling procedure to which the method proposed in the present disclosure is applicable.

[0077] Fig.25 A communication system applied to the present disclosure is shown.

[0078] Fig.26 A wireless device applicable to the present disclosure is shown.

[0079] Fig. 27 A signal processing circuit for transmitting a signal is shown.

[0080] Fig.28 Another example of a wireless device to which the present disclosure is applied is shown.

[0081] Fig.29 An AI device applied to the present disclosure is described by way of example. DETAILED DESCRIPTION

[0082] Hereinafter, preferred embodiments of the present disclosure will be described in detail with reference to the accompanying drawings. The detailed description given below with reference to the accompanying drawings is intended to illustrate exemplary embodiments of the present disclosure, but is not intended to represent the only embodiments in which the present disclosure can be practiced. The following detailed description includes specific details in order to provide a thorough understanding of the present disclosure. However, those skilled in the art understand that the present disclosure can be practiced without these specific details.

[0083] In some cases, well-known structures and devices may be omitted or shown in block diagram form focusing on the core functions of the structures and devices, so as to avoid obscuring the concepts of the present disclosure.

[0084] In the following, 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 a base station, and the receiver may be part of a terminal. In the uplink, the transmitter may be part of a terminal, and the receiver may be part of a base station. The base station may be represented as a first communication device, and the terminal may be represented as a second communication device. The base station (BS) may be replaced by terms including a fixed station, a node B, an evolved node B (eNB), a next generation node B (gNB), a base transceiver system (BTS), an access point (AP), a network (5G network), an AI system, a roadside unit (RSU), a vehicle, a robot, an unmanned aerial vehicle (UAV), an augmented reality (AR) device, a virtual reality (VR) device, and the like. In addition, the terminal may be fixed or mobile, and may be replaced by terms including user equipment (UE), mobile station (MS), user terminal (UT), mobile subscriber station (MSS), subscriber station (SS), advanced mobile station (AMS), wireless terminal (WT), machine type communication (MTC) device, machine-to-machine (M2M) device and device-to-device (D2D) device, vehicle, robot, AI module, unmanned aerial vehicle (UAV), augmented reality (AR) device, virtual reality (VR) device, etc.

[0085] The following technologies can be used in various wireless access systems including CDMA, FDMA, TDMA, OFDMA, SC-FDMA, etc. CDMA can be implemented as a radio technology such as Universal Terrestrial Radio Access (UTRA) or CDMA2000. TDMA can be implemented as a radio technology such as Global System for Mobile Communications (GSM) / General Packet Radio Service (GPRS) / Enhanced Data Rate for GSM Evolution (EDGE). OFDMA can be implemented as a radio technology such as IEEE802.11 (Wi-Fi), IEEE 802.16 (WiMAX), IEEE 802.20, Evolved UTRA (E-UTRA), etc. UTRA is part of Universal Mobile Telecommunications System (UMTS). The 3rd Generation Partnership Project (3GPP) Long Term Evolution (LTE) is a part of Evolved UMTS (E-UMTS) using E-UTRA, and LTE-Advanced (A) / LTE-A pro is an evolved version of 3GPP LTE. 3GPP New Radio (NR) or New Radio Access Technology is an evolved version of 3GPP LTE / LTE-A / LTE-A pro.

[0086] For the sake of clarity of description, the present disclosure is described based on a 3GPP communication system (e.g., LTE-A or NR), but the technical spirit of the present disclosure is not limited thereto. LTE refers to the technology after 3GPP TS 36.xxx Release 8. In detail, the LTE technology after 3GPP TS36.xxx Release 10 is called LTE-A, and the LTE technology after 3GPP TS 36.xxx Release 13 is called LTE-A pro. 3GPP NR means the technology after TS 38.xxx Release 15. LTE / NR may be referred to as a 3GPP system. "xxx" means the detailed number of the standard document. LTE / NR may be collectively referred to as a 3GPP system. The background technology, terms, abbreviations, etc. used to describe the present disclosure may refer to the matters disclosed in the standard documents disclosed before the present disclosure. For example, the following documents may be referred to.

[0087] 3GPP LTE

[0088] -36.211: Physical channels and modulation

[0089] -36.212: Multiplexing and channel coding

[0090] -36.213: Physical layer procedures

[0091] -36.300: General description

[0092] -36.331: Radio Resource Control (RRC)

[0093] 3GPP NR

[0094] -38.211: Physical channels and modulation

[0095] -38.212: Multiplexing and channel coding

[0096] -38.213: Physical layer procedures for control -38.214: Physical layer procedures for data -38.300: NR and NG-RAN general description -36.331: Radio Resource Control (RRC) protocol specification

[0097] Definitions and Abbreviations

[0098] BM: Beam Management

[0099] CQI: Channel Quality Indicator

[0100] CRI: CSI-RS (Channel State Information-Reference Signal) Resource Indicator CSI: Channel State Information

[0101] CSI-IM: Channel State Information-Interference Measurement

[0102] CSI-RS: Channel State Information-Reference Signal

[0103] DMRS: Demodulation Reference Signal

[0104] FDM: Frequency Division Multiplexing

[0105] FFT: Fast Fourier Transform

[0106] IFDMA: Interleaved Frequency Division Multiple Access

[0107] IFFT: Inverse Fast Fourier Transform

[0108] L1-RSRP: Layer 1 reference signal received power

[0109] L1-RSRQ: Layer 1 reference signal reception quality

[0110] MAC: Media Access Control

[0111] NZP: Non Zero Power

[0112] OFDM: Orthogonal Frequency Division Multiplexing

[0113] PDCCH: Physical Downlink Control Channel

[0114] PDSCH: Physical Downlink Shared Channel

[0115] PMI: Precoding Matrix Indicator

[0116] RE: Resource Element

[0117] RI: Rank Indicator

[0118] RRC: Radio Resource Control

[0119] RSSI: Received Signal Strength Indicator

[0120] Rx: Receive

[0121] QCL: Quasi-isotopic

[0122] SINR: Signal to Interference and Noise Ratio

[0123] SSB (or SS / PBCH block): synchronization signal block (including primary synchronization signal, secondary synchronization signal and physical broadcast channel)

[0124] TDM: Time Division Multiplexing

[0125] TRP: Transmit and Receive Point

[0126] TRS: Tracking Reference Signal

[0127] Tx: Send

[0128] UE: User Equipment

[0129] ZP: Zero Power

[0130] NR Radio Access

[0131] As more and more communication devices require greater communication capacity, improved mobile broadband communication is needed compared to existing radio access technologies (RATs). In addition, large-scale machine-type communications (MTC), which provide various services anytime and anywhere by connecting many devices and objects, is one of the main issues to be considered in next-generation communications. In addition, the design of communication systems considering services / UEs that are sensitive to reliability and latency is under discussion. Therefore, the discussion introduces the next-generation radio access technology that considers enhanced mobile broadband communication (eMBB), massive MTC (mMTC), ultra-reliable low-latency communication (URLLC), and for convenience in this disclosure, the technology is referred to as NR. NR is an expression representing an example of a 5G radio access technology (RAT).

[0132] An OFDM transmission scheme or a transmission scheme similar thereto is used in a new RAT system including NR. The new RAT system may follow OFDM parameters different from those of LTE. Alternatively, the new RAT system may follow the parameter set of the conventional LTE / LTE-A as is or have a larger system bandwidth (e.g., 100 MHz). Alternatively, one cell may support multiple parameter sets. In other words, UEs operating with different parameter sets may coexist in one cell.

[0133] A parameter set corresponds to one subcarrier spacing in the frequency domain. Different parameter sets can be defined by scaling the reference subcarrier spacing to an integer N.

[0134] The three main requirement areas of 5G include (1) enhanced mobile broadband (eMBB) area, (2) massive machine type communication (mMTC) area, and (3) ultra-reliable and low latency communication (URLLC) area.

[0135] Some use cases may require multiple areas for optimization, others may focus on only one key performance indicator (KPI). 5G is about supporting a variety of use cases in a flexible and reliable way.

[0136] eMBB goes far beyond basic mobile Internet access and covers rich interactive work, media and entertainment applications in the cloud or augmented reality. Data is one of the key drivers of 5G, and dedicated voice services may not be seen for the first time in the 5G era. In 5G, it is expected that voice will be processed as an application simply using the data connection provided by the communication system. The main reason for the increase in traffic is the increase in content size and the increase in the number of applications that require high data rates. As more and more devices are connected to the Internet, streaming services (audio and video), interactive video, and mobile Internet connections will be more and more widely used. A large number of applications require always-on connections to push real-time information and notifications to users. Cloud storage and applications are growing rapidly in mobile communication platforms, which can be applied to both work and entertainment. In addition, cloud storage is a special use case that drives the growth of uplink data transmission rates. 5G is also used for remote work in the cloud and requires lower end-to-end latency to maintain an excellent user experience when using a tactile interface. Entertainment (e.g., cloud games and video streaming) is another key factor that increases the demand for mobile broadband capabilities. Entertainment is needed in smart phones and tablets anywhere, including high mobility environments such as trains, vehicles, and airplanes. Another use case is augmented reality for entertainment and information retrieval. Here, augmented reality requires very low latency and instantaneous data volume.

[0137] Furthermore, one of the most anticipated 5G use cases involves the ability to smoothly connect embedded sensors in all fields (i.e., mMTC). The number of potential IoT devices is expected to reach 20.4 billion by 2020. 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.

[0138] URLLC includes new services that will transform industries through ultra-reliable / available links with low latency, such as remote control of critical infrastructure and self-driving vehicles. Smart grid control, industrial automation, robotics and drone control and regulation require reliability and latency levels.

[0139] Next, a number of use cases will be described in more detail.

[0140] 5G can complement fiber to the home (FTTH) and cable-based broadband (or DOCSIS) as a means of providing streams rated at gigabits per second at hundreds of megabits per second. Such fast speeds are needed to deliver TV with a resolution of 4K or above (6K, 8K and above) as well as virtual reality and augmented reality. Virtual reality (VR) and augmented reality (AR) applications include most immersive sports games. Specific applications may require special network configurations. For example, in the case of VR games, game companies may need to integrate core servers with network operators' edge network servers in order to minimize latency.

[0141] It is expected that cars will become an important new driving force for 5G, and many use cases are used for mobile communications in vehicles. For example, passenger entertainment requires high-capacity and high-mobility mobile broadband at the same time. The reason is that future users will continue to expect high-quality connections regardless of their location and speed. Another example of use in the automotive field is an augmented reality dashboard. This identifies objects in the dark that the driver sees through the front window, and superimposes and displays information that informs the driver of the distance and movement of the object. In the future, wireless modules allow communication between vehicles, information exchange between vehicles and supporting infrastructure, and information exchange between vehicles and other connected devices (e.g., devices carried by pedestrians). The safety system guides the alternative action process so that the driver can drive safely, thereby reducing the risk of accidents. The next step will be remote control of vehicles or self-driving vehicles. This requires very reliable and very fast communication between different self-driving vehicles and between cars and infrastructure. In the future, self-driving vehicles will perform all driving activities, and drivers will only focus on traffic that the vehicle itself cannot recognize. The technical requirements of self-driving vehicles require ultra-low latency and ultra-high-speed reliability to increase traffic safety to a level that humans cannot achieve.

[0142] Smart cities and smart homes (called smart societies) will be embedded in high-density wireless sensor networks. Distributed networks of smart sensors will identify conditions for cost and energy efficient maintenance of cities or houses. Similar configurations can be performed for individual homes. Temperature sensors, window and heating controls, burglar alarms, and household appliances are all wirelessly connected. Many sensors typically have low data rates, low power, and low cost. However, for example, a specific type of device may require real-time HD video for monitoring.

[0143] As the consumption and distribution of energy (including heat or gas) are highly decentralized, the automatic control of distributed sensor networks is needed. Smart grids use digital information and communication technologies to interconnect sensors to collect information and act based on the information. This information may include supplier behavior and consumer behavior, allowing smart grids to improve the distribution of fuel (e.g., electricity) in an automated manner in terms of efficiency, reliability, economy, and production sustainability. Smart grids can be viewed as another sensor network with low latency.

[0144] The health sector has many applications that can benefit from mobile communications. Communication systems can support telemedicine to provide clinical care in remote locations. This can help reduce distance barriers and improve accessibility to health services that are not consistently available in remote rural areas. This is also used to save lives in critical care and emergency situations. Wireless sensor networks based on wireless communications can provide remote monitoring and sensors for parameters such as heart rate and blood pressure.

[0145] Wireless and mobile communications are becoming increasingly important in the field of industrial applications. Cables are expensive to install and maintain. Therefore, the possibility of replacing cables with reconfigurable wireless links is an attractive opportunity in many industries. However, achieving this requires that the wireless connection operates with latency, reliability and capacity similar to cables and that its management is simplified. Low latency and very low error probability are new requirements needed to connect to 5G.

[0146] Logistics and freight tracking are important use cases for mobile communications, which allow inventory and packages to be tracked anywhere using location-based information systems. Logistics and freight tracking use cases typically require low data rates but require large range and reliable location information.

[0147] System Overview

[0148] Figure 1 is a diagram showing an example of an overall NR system structure to which the method proposed in the present disclosure can be applied.

[0149] Reference Figure 1NG-RAN consists of gNBs that provide the control plane (RRC) protocol side and NG-RA user plane (new AS sublayer / PDCP / RLC / MAC / PHY) for user equipment (UE).

[0150] gNBs are connected to each other via the Xn interface.

[0151] The gNB is connected to the NGC via the NG interface.

[0152] More specifically, the gNB is connected to the Access and Mobility Management Function (AMF) via the N2 interface and to the User Plane Function (UPF) via the N3 interface.

[0153] New RAT (NR) parameter set and frame structure

[0154] In NR systems, multiple parameter sets may be supported. Here, the parameter set may be defined by subcarrier spacing and cyclic prefix (CP) overhead. In this case, multiple subcarrier spacings may be derived by scaling the basic subcarrier spacing by an integer N (or μ). In addition, although it is assumed that very low subcarrier spacing is not used at very high carrier frequencies, the parameter set used may be selected independently of the frequency band.

[0155] In addition, in the NR system, various frame structures based on multiple parameter sets can be supported.

[0156] The following describes the Orthogonal Frequency Division Multiplexing (OFDM) parameter set and frame structure that can be considered in the NR system.

[0157] Multiple OFDM parameter sets supported in the NR system can be defined as shown in Table 1.

[0158] [Table 1]

[0159] μ <![CDATA[Δf=2 μ ·15[kHz]]]> Cyclic prefix 0 15 normal 1 30 normal 2 60 Normal, Extended 3 120 normal 4 240 normal

[0160] NR supports multiple parameter sets (or subcarrier spacing (SCS)) to support various 5G services. For example, when the SCS is 15kHz, it supports wide areas in the traditional cellular bands, when the SCS is 30kHz / 60kHz, it supports dense urban areas, lower latency and wider carrier bandwidth, and when the SCS is 60kHz or higher, it supports bandwidths greater than 24.25GHz to overcome phase noise.

[0161] The NR band is defined as two types of frequency ranges (FR1 and FR2). FR1 and FR2 may be configured as shown in Table 2 below. In addition, FR2 may mean millimeter wave (mmW).

[0162] [Table 2]

[0163] Frequency range specification Corresponding frequency range Subcarrier spacing FR1 410MHz-7125MHz 15,30,60kHz FR2 24250MHz-52600MHz 60,120,240kHz

[0164] Regarding the frame structure in the NR system, the sizes of various fields in the time domain are expressed as time units T s =1 / (Δf max ·N f ). Here, Δf max =480·10 3 , and N f =4096. Downlink and uplink transmissions are performed by a period of T f =(Δf max N f / 100)·T s =10ms radio frame. Here, the radio frame consists of two sf =(Δf max N f / 1000)·T s =1 ms. In this case, there may be one frame set for uplink and one frame set for downlink.

[0165] Figure 2 The relationship between an uplink frame and a downlink frame in a wireless communication system to which the method proposed in the present disclosure is applicable is shown.

[0166] like Figure 2 As shown, the transmission of uplink frame number i from a user equipment (UE) should be transmitted by the UE T earlier than the start of the downlink frame. TA =N TA T s start.

[0167] For parameter set μ, time slots are arranged in subframes according to The ascending order of the numbers and the order of A time slot consists of of consecutive OFDM symbols, and Determined by the parameter set and time slot configuration used. In a subframe, the time slot The beginning of Start alignment.

[0168] Not all UEs are capable of transmitting and receiving at the same time, which means that not all OFDM symbols of a downlink time slot or an uplink time slot may be used.

[0169] Table 3 shows the number of OFDM symbols per slot in normal CP Number of time slots per radio frame and the number of time slots per subframe Table 4 shows the number of OFDM symbols per slot, the number of slots per radio frame, and the number of slots per subframe in the extended CP.

[0170] [Table 3]

[0171]

[0172] [Table 4]

[0173]

[0174] Figure 3 An example of a frame structure in an NR system is shown. Figure 3 It is only for the convenience of description and does not limit the scope of the present disclosure.

[0175] In the case of Table 4, as an example of a case where μ=2 (ie, a case where the subcarrier spacing (SCS) is 60 kHz), one subframe (or frame) may include four slots by referring to Table 3, and as an example, Figure 3 , a case where one subframe = {1, 2, 4} time slots is shown, and the number of time slots that can be included in one subframe can be defined as shown in Table 3.

[0176] Furthermore, a mini-slot may consist of 2, 4, or 7 symbols, and may consist of more or fewer symbols.

[0177] Regarding the physical resources in the NR system, antenna ports, resource grids, resource elements, resource blocks, and carrier parts can be considered.

[0178] Below, the physical resources that can be considered in the NR system are described in detail.

[0179] First, with respect to antenna ports, antenna ports are defined such that a channel carrying a symbol on the antenna port can be inferred from a channel carrying another symbol on the same antenna port. In the case where large-scale properties of a channel carrying a symbol on one antenna port can be inferred from a channel carrying a symbol on a different antenna port, the two antenna ports can be referred to as having a QC / QCL (quasi-co-located or quasi-co-located) relationship. Here, the large-scale properties include one or more of delay spread, Doppler spread, frequency shift, average received power, and receive timing.

[0180] Figure 4 An example resource grid supported in a wireless communication system to which the method proposed in the present disclosure is applicable is shown.

[0181] Reference Figure 4 , although the resource grid is described as consisting of subcarriers, and one subframe consists of 14·2 μThe example of OFDM symbols is shown, but the embodiments of the present disclosure are not limited thereto.

[0182] In the NR system, the transmitted signal is composed of subcarriers and OFDM symbols are described by one or more resource grids. Refers to the maximum transmission bandwidth, and this may vary between uplink and downlink and between parameter sets.

[0183] In this case, if Figure 4 As shown, one resource grid may be configured for each parameter set μ and antenna port p.

[0184] Figure 5 An example of a per-antenna port and parameter set resource grid to which the method proposed in the present disclosure is applicable is shown.

[0185] Each element of the resource grid for a parameter set μ and an antenna port p is called a resource element and is indexed by Uniquely identifies. Here, is the index in the frequency domain, Indicates the symbol position in the subframe. When representing the resource elements in the time slot, the index pair (k, l) is used. Here,

[0186] For a numerology set μ and antenna port p, the resource element Corresponding to complex value In the case where there is no risk of confusion or where no specific antenna port or parameter set is specified, the indices p and μ can be dropped, and as a result, the complex value can become or

[0187] Physical resource blocks are in the frequency domain It is defined by consecutive subcarriers.

[0188] Point A may be used as a common reference point for the resource block grid and may be obtained as follows.

[0189] -OffsetToPointA for PCell downlink indicates the frequency offset between the lowest subcarrier of the lowest resource block overlaid with the SS / PBCH block used by the UE for initial cell selection and point A, and is represented by resource block units assuming 15 kHz subcarrier spacing for FR1 and 60 kHz subcarrier spacing for FR2; and

[0190] -absoluteFrequencyPointA indicates the frequency location of point A as expressed in absolute radio frequency channel number (ARFCN).

[0191] For subcarrier spacing setting μ, common resource blocks are numbered upwards starting from 0 in the frequency domain.

[0192] The center of subcarrier 0 of common resource block 0 with subcarrier spacing setting μ coincides with "point A". Common resource block number in frequency domain The resource element (k, l) with subcarrier spacing setting μ is given in Equation 1 below.

[0193] [Formula 1]

[0194]

[0195] Here, k may be relatively defined in point A, such that k=0 corresponds to a subcarrier centered at point A. Physical resource blocks are spaced from 0 to 1 in a bandwidth part (BWP). number, i represents the number of BWP. Physical resource block n in BWP i PRB With common resource block n CRB The relationship between is given by the following formula 2.

[0196] [Formula 2]

[0197]

[0198] here, It can be a common resource block where the BWP starts relative to common resource block 0.

[0199] Synchronization Signal Block (SSB) transmission and related operations

[0200] Figure 6 The SSB structure is shown. The UE can perform cell search, system information acquisition, beam alignment for initial access, DL measurement, etc. based on the SSB. The SSB is used in combination with the SS / synchronization signal / physical broadcast channel (PBCH) blocks.

[0201] Reference Figure 6 , SSB is composed of PSS, SSS, and PBCH. SSB is composed of four consecutive OFDM symbols, and PSS, PBCH, SSS / PBCH and PBCH are sent for each OFDM symbol. Each of PSS and SSS can be composed of one OFDM symbol and 127 subcarriers, and PBCH is composed of 3 OFDM symbols and 576 subcarriers. Polarity coding and quadrature phase shift keying (QPSK) are applied to PBCH. For each OFDM symbol, PBCH is composed of data RE and demodulation reference signal (DMRS) RE. There are three DMRS REs for each RB, and there are three data REs between DMRS REs.

[0202] Community Search

[0203] Cell search refers to the process of acquiring time / frequency synchronization of a cell by the UE and detecting the cell identifier (ID) of the cell (e.g., physical layer cell ID (PCID)). PSS is used to detect a cell ID within a cell ID group, and SSS is used to detect a cell ID group. PBCH is used for SSB (time) index detection and half-frame detection.

[0204] The cell search process of the UE may be organized as shown in Table 5 below.

[0205] [Table 5]

[0206]

[0207] There are 336 cell ID groups, and each cell ID group has three cell IDs. There may be a total of 1008 cell IDs, and the cell ID may be defined by Equation 3.

[0208] [Formula 3]

[0209]

[0210] here, and

[0211] Here, NcellID represents a cell ID (eg, PCID). N(1)ID represents a cell ID group and is provided / acquired through the SSS. N(2)ID represents a cell ID in the cell ID group and is provided / acquired through the PSS.

[0212] The PSS sequence dPSS(n) can be defined to satisfy Equation 4.

[0213] [Formula 4]

[0214] d PSS (n) = 1-2x(m)

[0215]

[0216] 0≤n<127

[0217] Here, x(i+7)=(x(i+4)+x(i))mod2, and

[0218] [x(6) x(5) x(4) x(3) x(2) x(1) x(0)]=[1 1 1 0 1 1 0].

[0219] The SSS sequence dSSS(n) can be defined to satisfy Equation 5.

[0220] [Formula 5]

[0221] dSSS (n)=[1-2x0((n+m0)mod127)][1-2x1((n+m1)mod127)]

[0222]

[0223]

[0224] 0≤n<127

[0225] x0(i+7)=(x0(i+4)+x0(i))mod2

[0226] Here, x1(i+7)=(x1(i+1)+x1(i))mod2, and

[0227] [x0(6) x0(5) x0(4) x0(3) x0(2) x0(1) x0(0)]=[0 0 0 0 0 0 1]

[0228] [x1(6) x1(5) x1(4) x1(3) x1(2) x1(1) x1(0)]=[0 0 0 0 0 0 1].

[0229] Figure 7 An SSB transmission is shown.

[0230] The SSB is sent periodically according to the SSB periodicity. The SSB basic periodicity assumed by the UE in the initial cell search is defined as 20ms. After cell access, the SSB periodicity can be configured by the network (e.g., BS) to one of {5ms, 10ms, 20ms, 40ms, 80ms, 160ms}. At the beginning of the SSB periodicity, a set of SSB bursts is configured. The SSB burst set can be configured by a 5ms time window (i.e., half a frame), and the SSB can be sent up to L times within the SS burst set. The maximum number of transmissions L of the SSB can be given as follows according to the frequency band of the carrier. One time slot includes at most two SSBs.

[0231] - For the frequency range up to 3 GHz, L = 4

[0232] - For the frequency range from 3 GHz to 6 GHz, L = 8

[0233] - For the frequency range from 6 GHz to 52.6 GHz, L = 64

[0234] The temporal position of an SSB candidate in an SS burst set may be defined according to the SCS as follows: The temporal position of an SSB candidate is indexed from 0 to L-1 (SSB index) in temporal order within an SSB burst set (ie, half-frame).

[0235] - Case A - 15kHz 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 to 6 GHz, n=0,1,2,3.

[0236] - Case B - 30kHz 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 to 6 GHz, n=0,1.

[0237] - Case C - 30kHz 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 to 6 GHz, n=0,1,2,3.

[0238] - Case D - 120kHz SCS: The index of the starting symbol of the candidate SSB is given as {4,8,16,20}+28*n. When the carrier frequency exceeds 6GHz, n=0,1,2,3,5,6,7,8,10,11,12,13,15,16,17,18.

[0239] - Case E - 240kHz 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 exceeds 6GHz, n = 0, 1, 2, 3, 5, 6, 7, 8.

[0240] Figure 8 It shows that the UE acquires information about DL time synchronization.

[0241] The UE can acquire DL synchronization by detecting the SSB. The UE can identify the structure of the SSB burst set based on the detected SSB index, and thus detect the symbol / time slot / half-frame boundary. The SFN information and half-frame indication information can be used to identify the frame / half-frame number to which the detected SSB belongs.

[0242] Specifically, the UE can obtain 10-bit system frame number (SFN) information (s0 to s9) from the PBCH. Six bits of the 10-bit SFN information are obtained from the master information block (MIB), and the remaining 4 bits are obtained from the PBCH transport block (TB).

[0243] Next, the UE may obtain 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. PBCH DMRS uses one of eight PBCH DMRS sequences to indicate 3 bits of information. Therefore, in the case of L=4, the remaining 1 bit after indicating the SSB index among the 3 bits indicated using eight PBCH DMRS sequences may be used for half-frame indication.

[0244] Finally, the UE can obtain the SSB index based on the DMRS sequence and the PBCH payload. The SSB candidates are indexed from 0 to L-1 in chronological order within the SSB burst set (i.e., half-frame). In the case of L=8 or 64, the least significant bit (LSB) 3 bits of the SSB index can be indicated using eight different PBCH DMRS sequences (b0 to b2). In the case of L=64, the most significant bit (MSB) 3 bits of the SSB index are indicated by PBCH (b3 to b5). In the case of L=2, the LSB 2 bits of the SSB index can be indicated using four different PBCH DMRS sequences (b0 and b1). In the case of L=4, the 1 bit remaining after indicating the SSB index among the 3 bits indicated by the eight PBCH DMRS sequences can be used for half-frame indication (b2).

[0245] Physical channels and general signaling

[0246] Fig. 9 Shows physical channels and general signal transmission used in the 3GPP system. In a wireless communication system, a UE receives information from a BS through a downlink (DL), and the UE transmits information from the BS through an uplink (UL). Information transmitted and received by the BS and the UE includes data and various control information, and there are various physical channels according to the type / purpose of information transmitted and received by the BS and the UE.

[0247] When the UE is powered on or newly enters a cell, the UE performs an initial cell search operation (e.g., synchronization with a BS) (S601). To this end, the UE may receive a primary synchronization signal (PSS) and a secondary synchronization signal (SSS) from the BS and synchronize with the eNB, and acquire information such as a cell ID, etc. Thereafter, the UE may receive a physical broadcast channel (PBCH) from the BS and acquire intra-cell broadcast information. In addition, the UE receives a downlink reference signal (DL RS) in the initial cell search step to check the downlink channel state.

[0248] The UE that has completed the initial cell search receives a physical downlink control channel (PDCCH) and a physical downlink control channel (PDSCH) according to information loaded on the PDCCH to acquire more specific system information (S602).

[0249] In addition, when there is no radio resource for first accessing the BS or for signal transmission, the UE may perform a random access procedure (RACH) on the BS (S603 to S606). To this end, the UE may send a specific sequence to the preamble through a physical random access channel (PRACH) (S603 and S605) and receive a response message (random access response (RAR) message) to the preamble through a PDCCH and a corresponding PDSCH. In the case of a contention-based RACH, a contention resolution procedure (S606) may be additionally performed.

[0250] The UE performing the above process may then perform PDCCH / PDSCH reception (S607) and physical uplink shared channel (PUSCH) / physical uplink control channel (PUCCH) transmission (S608) as a general uplink / downlink signal transmission process. Specifically, the UE may receive downlink control information (DCI) through the PDCCH. Here, the DCI may include control information such as resource allocation information of the UE, and the format may be applied differently according to the purpose of use.

[0251] In addition, the control information that the UE transmits to the BS through an uplink or that the UE receives from the eNB may include a downlink / uplink ACK / NACK signal, a channel quality indicator (CQI), a precoding matrix index (PMI), a rank indicator (RI), etc. The UE may transmit control information such as CQI / PMI / RI through the PUSCH and / or the PUCCH.

[0252] Table 6 shows an example of the DCI format in the NR system.

[0253] [Table 6]

[0254] DCI format use 0_0 PUSCH Scheduling in a Cell 0_1 PUSCH Scheduling in a Cell 1_0 Scheduling of PDSCH in a cell 1_1 Scheduling of PDSCH in a cell

[0255] Referring to Table 6, DCI format 0_0 is used for scheduling of PUSCH in one cell.

[0256] The information included in DCI format 0_0 is CRC-scrambled and sent by C-RNTI, CS-RNTI or MCS-C-RNTI. In addition, DCI format 0_1 ​​is used to reserve PUSCH in a cell. The information included in DCI format 0_1 ​​is CRC-scrambled and sent by C-RNTI, CS-RNTI, SP-CSI-RNTI or MCS-C-RNTI. DCI format 1_0 is used to schedule PDSCH in a DL cell. The information included in DCI format 1_0 is CRC-scrambled and sent by C-RNTI, CS-RNTI or MCS-C-RNTI. DCI format 1_1 is used to schedule PDSCH in a cell. The information included in DCI format 1_1 is CRC-scrambled and sent by C-RNTI, CS-RNTI or MCS-C-RNTI. DCI format 2_1 is used to inform the UE that PRBs and OFDM symbols that are not expected to be transmitted can be assumed.

[0257] The following information included in DCI format 2_1 is CRC-scrambled and transmitted through INT-RNTI.

[0258] - Preemption indication 1, preemption indication 2, ..., preemption indication N.

[0259] In the present disclosure, a signaling scheme and UE / BS behavior are proposed for indicating / supporting a padding technique applied when the dimension size of information related to the spatial domain / frequency domain / time domain used for implementation reasons is smaller than the size of the DFT vector when a DFT vector is used to configure a codebook for CSI acquisition / reporting.

[0260] In the present disclosure, " / " may mean all contents distinguished by / (and) or only some distinguished contents (or).

[0261] In the following, 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 a base station, and the receiver may be part of a terminal. In the uplink, the transmitter may be part of a terminal, and the receiver may be part of a base station. The base station may be represented as a first communication device, and the terminal may be represented as a second communication device. The base station (BS) may be replaced by terms including a fixed station, a node B, an evolved node B (eNB), a next generation node B (gNB), a base transceiver system (BTS), an access point (AP), a network (5G network), an artificial intelligence (AI) system / module, a roadside unit (RSU), a robot, an unmanned aerial vehicle (UAV), an augmented reality (AR) device, a virtual reality (VR) device, and the like. In addition, the terminal may be fixed or mobile, and may be replaced by terms including user equipment (UE), mobile station (MS), user terminal (UT), mobile subscriber station (MSS), subscriber station (SS), advanced mobile station (AMS), wireless terminal (WT), machine type communication (MTC) device, machine-to-machine (M2M) device and device-to-device (D2D) device, vehicle, roadside unit (RSU), robot, artificial intelligence (AI) module, unmanned aerial vehicle (UAV), augmented reality (AR) device, virtual reality (VR) device, etc.

[0262] Beam Management (BM)

[0263] The BM process, which is a Layer 1 (L1) / Layer 2 (L2) process for acquiring and maintaining a set of base station (e.g., gNB, TRP, etc.) and / or terminal (e.g., UE) beams that can be used for downlink (DL) and uplink (UL) transmission / reception, may include the following processes and terms.

[0264] - Beam measurement: An operation of measuring the characteristics of a beamforming signal received by a BS or UE.

[0265] -Beam determination: An operation of selecting a transmit (Tx) beam / receive (Rx) beam of a BS or UE by a BS or UE.

[0266] - Beam scanning: The operation of covering a spatial area using transmit and / or receive beams at time intervals according to a predetermined scheme.

[0267] -Beam reporting: An operation where the UE reports information of beamformed signals based on beam measurements.

[0268] The BM process may be divided into (1) a DL BM process using a synchronization signal (SS) / physical broadcast channel (PBCH) block or a CSI-RS and (2) a UL BM process using a sounding reference signal (SRS).

[0269] In addition, each BM process may include Tx beam scanning for determining a Tx beam and Rx beam scanning for determining an Rx beam.

[0270] Downlink Beam Management (DL BM)

[0271] Fig.10 is a diagram showing an example of beams used for beam management.

[0272] The DL BM process may include (1) transmission of a beamforming DL reference signal (RS) (eg, CIS-RS or SS block (SSB)) by the eNB and (2) beam reporting by the UE.

[0273] Here, the beam reports the preferred DL RS identifier (ID) and L1 reference signal received power (RSRP).

[0274] The DL RS ID may be a SSB resource indicator (SSBRI) or a CSI-RS resource indicator (CRI).

[0275] like Fig.10 As shown, SSB beams and CSI-RS beams can be used for beam management. The measurement metric is L1-RSRP for each resource / block. SSB can be used for coarse beam management and CSI-RS can be used for fine beam management. SSB can be used for both Tx beam scanning and Rx beam scanning.

[0276] While the UE changes the Rx beam for the same SSBRI across multiple SSB bursts, Rx beam scanning using SSB may be performed. Here, one SS burst includes one or more SSBs, and one SS burst set includes one or more SSB bursts.

[0277] DL BM using SSB

[0278] Fig.11 is a flow chart illustrating an example of a downlink beam management process.

[0279] Configuration of beam reporting using SSB is performed during CSI / beam configuration in RRC connected state (or RRC connected mode).

[0280] - The UE receives a CSI-ResourceConfig IE including a CSI-SSB-ResourceSetList (including SSB resources for BM) from the BS (S910).

[0281] Table 7 shows an example of CSI-ResourceConfig IE, and as shown in Table A, the BM configuration using SSB is not separately defined, and SSB is similar to CSI-RS resource configuration.

[0282] [Table 7]

[0283]

[0284] In Table 7, the csi-SSB-ResourceSetList parameter indicates a list of SSB resources in a resource set for beam management and reporting. Here, the SSB resource set can be configured as {SSBx1, SSBx2, SSBx3, SSBx4, ...}. The SSB index can be defined as 0 to 63.

[0285] -The UE receives SSB resources from the BS based on the CSI-SSB-ResourceSetList (S920).

[0286] -When CSI-RS reportConfig associated with reporting of SSBRI and L1-RSRP is configured, the UE (beam) reports the best SSBRI and the L1-RSRP corresponding thereto to the BS (S930).

[0287] In other words, when reportQuantity of the CSI-RS reportConfig IE is configured as "ssb-Index-RSRP", the UE reports the best SSBRI and the corresponding L1-RSRP to the BS.

[0288] In addition, when CSI-RS resources are configured in the same OFDM symbol as SSB (SS / PBCH block) and "QCL-TypeD" is applicable, the UE can assume that the CSI-RS and SSB are quasi-colocated from the perspective of "QCL-TypeD".

[0289] Here, QCL Type D may mean antenna port QCL from the perspective of spatial Rx parameters. When the UE receives multiple DL antenna ports with a QCL Type D relationship, the same Rx beam may be applied. In addition, the UE does not expect CSI-RS to be configured in REs that overlap with REs of SSB.

[0290] DL BM using CSI-RS

[0291] Regarding the use of CSI-RS, i) when the repetition parameter is configured in a specific CSI-RS resource set and TRS_info is not configured, CSI-RS is used for beam management. ii) when the repetition parameter is not configured and TRS_info is configured, CSI-RS is used for tracking reference signal (TRS). iii) when the repetition parameter is not configured and TRS_info is not configured, CSI-RS is used for CSI acquisition.

[0292] The repetition parameter may be configured only for CSI-RS resource sets associated with a CSI-ReportConfig with a report of L1 RSRP or "no report (or none)".

[0293] When the UE is configured with a CSI-ReportConfig in which reportQuantity is configured as "cri-RSRP" or "None" and the CSI-ResourceConfig for channel measurement (higher layer parameter resourcesForChannelMeasurement) does not include the high-layer parameter "trs-Info" but is configured with an NZP-CSI-RS-ResourceSet with the high-layer parameter "repetition", the UE may be configured only with the same number of ports (1 port or 2 ports) with the high-layer parameter "nrofPorts" for all CSI-RS resources in the NZP-CSI-RS-ResourceSet.

[0294] When (high-level parameter) repetition is configured to "ON", (high-level parameter) repetition is associated with the UE's Rx beam scanning process. In this case, when the UE is configured with NZP-CSI-RS-ResourceSet, the UE may assume that at least one CSI-RS resource in the NZP-CSI-RS-ResourceSet is sent to the same downlink spatial domain transmission filter. In other words, at least one CSI-RS resource in the NZP-CSI-RS-ResourceSet is sent through the same Tx beam. Here, at least one CSI-RS resource in the NZP-CSI-RS-ResourceSet may be sent to different OFDM symbols. In addition, the UE does not expect to receive different periodicities in periodicityAndOffset in all CSI-RS resources in the NZP-CSI-RS-Resourceset.

[0295] On the contrary, when Repetition is configured as "OFF", Repetition is associated with the Tx beam scanning process of the BS. In this case, when repetition is configured as "OFF", the UE does not assume that at least one CSI-RS resource in the NZP-CSI-RS-ResourceSet is sent to the same downlink spatial domain transmission filter. In other words, at least one CSI-RS resource in the NZP-CSI-RS-ResourceSet is sent through a different Tx beam.

[0296] Fig.12 An example of a downlink beam management procedure using a channel state information-reference signal (CSI-RS) is shown.

[0297] Fig.12 (a) shows the Rx beam determination (or refinement) process of the UE, Fig.12 (b) shows the Tx beam scanning process of the BS. In addition, Fig.12 (a) shows the case where the repetition parameter is configured as "ON", Fig.12 (b) shows the case where the repetition parameter is configured to "OFF".

[0298] Reference Fig.12 (a) and Fig.13 , the Rx beam determination processing of the UE will be described.

[0299] Fig.13 is a flow chart illustrating an example of a receive beam determination process of a UE.

[0300] - The UE receives the NZP CSI-RS resource set IE including the higher layer parameter repetition from the BS through RRC signaling (S1110). Here, the repetition parameter is configured as "ON".

[0301] - The UE repeatedly receives resources configured as repetition “ON” in a CSI-RS resource set in different OFDM symbols through the same Tx beam (or DL ​​spatial domain transmission filter) of the BS (S1120).

[0302] -UE determines its Rx beam (S1130).

[0303] - UE skips CSI reporting (S1140). In this case, reportQuantity of the CSI reporting configuration may be configured as "no report (or none)".

[0304] In other words, when repetition “ON” is configured, the UE can skip CSI reporting.

[0305] Reference Fig.10 and Fig.12 , the Tx beam determination processing of the BS will be described.

[0306] Fig.14 is a flowchart illustrating an example of a transmit beam determination process of a BS.

[0307] - The UE receives the NZP CSI-RS resource set IE including the higher layer parameter repetition from the BS through RRC signaling (S1210). Here, the repetition parameter is configured as "OFF" and is associated with the Tx beam scanning process of the BS.

[0308] -The UE receives resources configured as repetition “OFF” in the CSI-RS resource set through different Tx beams (DL spatial domain transmission filters) of the eNB (S1220).

[0309] -The UE selects (or determines) the best beam (S1230).

[0310] - The UE reports the ID of the selected beam and related quality information (eg, L1-RSRP) to the BS (S1240). In this case, the reportQuantity of the CSI report configuration may be configured as "CRI+L1-RSRP".

[0311] In other words, when CSI-RS is transmitted for BM, UE reports CRI and its L1-RSRP to BS.

[0312] Fig.15 An example of resource allocation in the time domain and the frequency domain related to the DL BM process using CSI-RS is shown.

[0313] Specifically, it can be seen that when repetition "ON" is configured in the CSI-RS resource set, multiple CSI-RS resources are repeatedly used by applying the same Tx beam, and when repetition "OFF" is configured in the CSI-RS resource set, different CSI-RS resources are sent through different Tx beams.

[0314] DL BM related beam indication

[0315] The UE may be RRC configured with a list of up to M candidate transmission configuration indication (TCI) states for at least the purpose of quasi-co-location (QCL) indication. Here, M may be 64.

[0316] Each TCI state may be configured as an RS set. At least the ID of each DL RS for spatial QCL (QCL type D) purpose in the RS set may refer to one of the DL RS types including SSB, P-CSI RS, SP-CSI RS, A-CSI RS, etc.

[0317] Initialization / update of IDs of DL RSs in an RS set for spatial QCL purposes may be performed at least through explicit signaling.

[0318] Table 8 shows an example of TCI-State IE.

[0319] The TCI-State IE is associated with a quasi-collocation (QCL) type corresponding to one or two DL reference signals (RS).

[0320] [Table 8]

[0321]

[0322] In Table 8, the bwp-Id parameter indicates the DL BWP where the RS is located, the cell parameter indicates the carrier where the RS is located, and the reference signal parameter indicates the reference antenna port that becomes the quasi-co-located source of the corresponding target antenna port or the reference signaling including it. The target antenna port can be a CSI-RS, a PDCCH DMRS, or a PDSCH DMRS. As an example, the corresponding TCI state ID may be indicated for the NZP CSI-RS resource configuration information so as to indicate the QCL reference RS information of the NZP CSI-RS. As another example, the TCI state ID may be indicated for each CORESET configuration so as to indicate the QCL reference information of the PDCCH DMRS antenna port. As another example, the TCI state ID may be indicated by the DCI so as to indicate the QCL reference information of the PDSCH DMRS antenna port.

[0323] Quasi-isotope (QCL)

[0324] The antenna ports are defined so that the channel through which symbols on the antenna port are transmitted can be inferred from the channel through which different symbols on the same antenna port are transmitted. Two antenna ports may have a quasi-co-located or quasi-co-located (QC / QCL) relationship when the properties of the channel through which symbols on one antenna port are transmitted can be inferred from the channel through which symbols on different antenna ports are transmitted.

[0325] Here, the channel properties include at least one of delay spread, Doppler spread, frequency / Doppler shift, average received power, receive timing / average delay, and spatial Rx parameters. Here, the spatial Rx parameters mean spatial (receive) channel property parameters such as angle of arrival.

[0326] The UE may be configured with a list of up to M TCI-State configurations in the higher layer parameter PDSCH-Config in order to decode the PDSCH from the detected PDCCH with the expected DCI for the corresponding UE and a given serving cell. M depends on the UE capabilities.

[0327] Each TCI-State includes parameters for configuring a quasi-co-location relationship between one or two DL reference signals and a DM-RS port of a PDSCH.

[0328] The quasi-colocation relationship is configured as a high-level parameter qcl-Type1 of the first DL RS and qcl-Type2 of the second DL RS (when configured). Regardless of whether the two DL RSs are DL RSs with the same reference or DL ​​RSs with different references, the two DL RSs are different from each other in terms of QCL type.

[0329] The quasi-colocation type corresponding to each DL RS may be given by the high-level parameter qcl-Type of QCL-Info and may take one of the following values.

[0330] - "QCL-TypeA": {Doppler shift, Doppler spread, average delay, delay spread}

[0331] - "QCL-TypeB": {Doppler shift, Doppler spread}

[0332] - "QCL-TypeC": {Doppler shift, average delay}

[0333] - "QCL-TypeD": {spatial Rx parameters}

[0334] For example, when the target antenna port is a specific NZP CSI-RS, the corresponding NZP CSI-RS antenna port may be indicated / configured to QCL with a specific TRS from the perspective of QCL-Type A and to QCL with a specific SSB from the perspective of QCL-Type D. The UE that has received the indication / configuration may receive the corresponding NZP CSI-RS using the Doppler delay value measured in the QCL-TypeA TRS and apply an Rx beam for receiving the QCL-TypeD SSB to the reception of the corresponding NZP CSI-RS.

[0335] The UE may receive the activation command via MAC CE signaling for mapping up to 8 TCI states to code points of the DCI field "Transmission Configuration Indication".

[0336] UL BM

[0337] In the case of UL BM, beam reciprocity (or beam correspondence) between Tx beam and Rx beam may or may not be established according to UE implementation. If reciprocity between Tx beam and Rx beam is established in both BS and UE, UL beam pair can be matched by DL beam pair. However, even when reciprocity between Tx beam and Rx beam is not established in either BS or UE, UL beam pair determination processing is required in addition to DL beam pair determination.

[0338] In addition, even when both the BS and the UE maintain beam correspondence, the BS may use the UL BM procedure in order to determine the DL Tx beam in a case where the UE does not request a report of a preferred beam.

[0339] UL BM can be performed by beamforming UL SRS transmission, and whether UL BM of an SRS resource set is applied is configured by (higher layer parameter) usage. When usage is configured as "BeamManagement (BM)", only one SRS resource can be sent to each of multiple SRS resource sets at a given time.

[0340] The UE may be configured with one or more sounding reference symbol (SRS) resource sets configured by (high-level parameter) SRS-ResourceSet (through high-level signaling, RRC signaling, etc.). For each SRS resource set, the UE may be configured with K (≥1) SRS resources (high-level parameter SRS-resource). Here, K is a natural number, and the maximum value of K is indicated by SRS_capability.

[0341] Similar to the DL BM, the UL BM process can also be divided into Tx beam scanning of the UE and Rx beam scanning of the BS.

[0342] Fig.16 An example of an uplink beam management (UL BM) procedure using a sounding reference signal (SRS) is shown. Fig.16 (a) shows the Rx beam determination process of the BS, Fig.16 (b) shows the Tx beam scanning process of the UE.

[0343] Fig.17 is a flow chart illustrating an example of an uplink beam management process using SRS.

[0344] - The UE receives RRC signaling (eg, SRS-Config IE) including a (higher layer parameter) usage parameter configured as "beam management" from the BS (S1510).

[0345] Table 9 shows an example of an SRS-Config information element (IE), and the SRS-Config IE is used for SRS transmission configuration. The SRS-Config IE includes a list of SRS-Resources and a list of SRS-ResourceSets. Each SRS resource set means a collection of SRS-resources.

[0346] The network may use the configured aperiodicSRS-ResourceTrigger (L1 DCI) to trigger the transmission of the SRS resource set.

[0347] [Table 9]

[0348]

[0349]

[0350]

[0351] In Table 9, usage represents a high-level parameter indicating whether the SRS resource set is used for beam management or whether the SRS resource set is used for codebook-based or non-codebook-based transmission. The usage parameter corresponds to the L1 parameter "SRS-SetUse". "spatialRelationInfo" is a parameter indicating the configuration of the spatial relationship between the reference RS and the target SRS. Here, the reference RS may become SSB, CSI-RS, or SRS corresponding to the L1 parameter "SRS-SpatialRelationInfo". Usage is configured for each SRS resource set.

[0352] -The UE determines a Tx beam for the SRS resource to be transmitted based on the SRS-SpatialRelation Info included in the SRS-Config IE (S1520). Here, the SRS-SpatialRelation Info is configured for each SRS resource and indicates the same beam as the beam used in the SSB, CSI-RS, or SRS to be applied to each SRS resource. In addition, the SRS-SpatialRelationInfo may be configured or not configured in each SRS resource.

[0353] -If SRS-SpatialRelationInfo is configured in the SRS resource, SRS-SpatialRelationInfo is transmitted by applying the same beam as the beam used in SSB, CSI-RS, or SRS. However, if SRS-SpatialRelationInfo is not configured in the SRS resource, the UE arbitrarily determines a Tx beam and transmits SRS through the determined Tx beam (S1530).

[0354] More specifically, for a P-SRS with "SRS-ResourceConfigType" configured as "periodic":

[0355] i) when SRS-SpatialRelationInfo is configured as "SSB / PBCH", the UE transmits the corresponding SRS resource by applying the same spatial domain transmit filter as (or generated from) the spatial domain Rx filter used to receive SSB / PBCH; or

[0356] ii) when SRS-SpatialRelationInfo is configured as "CSI-RS", the UE transmits SRS resources by applying the same spatial domain transmission filter used for receiving periodic CSI-RS or SP CSI-RS; or

[0357] iii) When SRS-SpatialRelationInfo is configured as "SRS", the UE transmits SRS resources by applying the same spatial domain transmission filter used to transmit periodic CSI-RS.

[0358] Even when 'SRS-ResourceConfigType' is configured as 'SP-SRS' or 'AP-SRS', beam determination and transmission operations may be applied similarly thereto.

[0359] - In addition, like the following three cases, the UE may receive or not receive feedback on the SRS from the BS (S1540).

[0360] i) When Spatial_Relation_Info is configured for all SRS resources in the SRS resource set, the UE transmits the SRS using the beam indicated by the BS. For example, when all Spatial_Relation_Info indicate the same SSB, CRI or SRI, the UE repeatedly transmits the SRS using the same beam. This case where the use of the Rx beam is selected by the BS corresponds to Fig.16 (a).

[0361] ii) Spatial_Relation_Info may not be configured for all SRS resources in an SRS resource set. In this case, the UE may transmit the SRS while arbitrarily changing the SRS beam. In other words, this case of the use of scanning the Tx beam by the UE corresponds to Fig.16 (b).

[0362] iii) Spatial_Relation_Info may be configured only for some SRS resources in an SRS resource set. In this case, SRS may be transmitted using a beam configured for the configured SRS resource, and the UE may arbitrarily transmit SRS by applying a Tx beam to SRS resources for which Spatial_Relation_Info is not configured.

[0363] Channel State Information (CSI) Related Process

[0364] Fig.18 is a flowchart illustrating an example of a CSI-related process to which the method proposed in the present disclosure can be applied.

[0365] In New Radio (NR) systems, Channel State Information-Reference Signal (CSI-RS) is used for time and / or frequency tracking, CSI calculation, Layer 1 (L1) Reference Signal Received Power (RSRP) calculation, and mobility.

[0366] The expression “A and / or B” used in the present disclosure may be interpreted as having the same meaning as “including at least one of A and B”.

[0367] CSI calculation is related to CSI acquisition, and L1-RSRP calculation is related to beam management (BM).

[0368] Channel state information (CSI) collectively refers to information that may indicate the quality of a radio channel (or referred to as a link) formed between a UE and an antenna port.

[0369] In order to perform one of the uses of CSI-RS, a terminal (e.g., user equipment (UE)) receives CSI-related configuration information from a base station (e.g., a general Node B or gNB) through radio resource control (RRC) signaling (step S1610).

[0370] The CSI-related configuration information may include at least one of CSI interference management (IM) resource related information, CSI measurement configuration related information, CSI resource configuration related information, CSI-RS resource related information, or CSI report configuration related information.

[0371] The CSI-IM resource related information may include CSI-IM resource information, CSI-IM resource set information, etc.

[0372] A CSI-IM resource set is identified by a CSI-IM resource set identifier (ID), and one resource set includes at least one CSI-IM resource.

[0373] Each CSI-IM resource is identified by a CSI-IM resource ID.

[0374] The CSI resource configuration related information defines a group including at least one of a non-zero power (NZP) CSI-RS resource set, a CSI-IM resource set, or a CSI-SSB resource set.

[0375] In other words, the CSI resource configuration related information may include a CSI-RS resource set list, and the CSI-RS resource set list may include at least one of an NZP CSI-RS resource set list, a CSI-IM resource set list, or a CSI-SSB resource set list.

[0376] The CSI resource configuration related information may be represented as CSI-ResourceConfig IE.

[0377] A CSI-RS resource set is identified by a CSI-RS resource set ID, and one resource set includes at least one CSI-RS resource.

[0378] Each CSI-RS resource is identified by a CSI-RS resource ID.

[0379] As shown in Table 10, parameters indicating the purpose (eg, BM-related "repetition" parameters and tracking-related "trs-Info" parameters) may be configured for each NZP CSI-RS resource set.

[0380] Table 10 shows an example of NZP CSI-RS resource set IE.

[0381] [Table 10]

[0382]

[0383]

[0384] In Table 10, the repetition parameter, which is a parameter indicating whether to repeatedly transmit the same beam, indicates whether repetition is "ON" or "OFF" for each NZP CSI-RS resource set.

[0385] The Tx beam used in the present disclosure may be interpreted as the same meaning as a spatial domain transmission filter, and the Rx beam may be interpreted as the same meaning as a spatial domain reception filter.

[0386] For example, when the repetition parameter of Table 10 is configured to "OFF", the UE does not assume that the NZP CSI-RS resources in the resource set are transmitted using the same spatial domain transmission filter and the Nrofports in all symbols are the same.

[0387] In addition, the repetition parameter corresponding to the higher layer parameter corresponds to "CSI-RS-ResourceRep" of the L1 parameter.

[0388] The CSI report configuration related information includes a reportConfigType parameter indicating a time domain behavior and a reportQuantity parameter indicating a CSI related quantity for reporting.

[0389] Time domain behavior can be periodic, aperiodic, or semi-persistent.

[0390] In addition, CSI report configuration related information may be represented as CSI-ReportConfig IE, and the following Table 11 shows an example of the CSI-ReportConfig IE.

[0391] [Table 11]

[0392]

[0393]

[0394] In addition, the UE measures CSI based on the configuration information related to CSI (S1620).

[0395] The CSI measurement may include (1) a CSI-RS reception process ( S1622 ) and (2) a process of calculating CSI through the received CSI-RS ( S1624 ).

[0396] The sequence for CSI-RS is generated by the following equation 6, and the initialization value of the pseudo-random sequence C(i) is defined by equation 7.

[0397] [Formula 6]

[0398]

[0399] [Formula 7]

[0400]

[0401] In equations 6 and 7, Indicates the slot number in the radio frame and is located at the beginning of each OFDM symbol. Initialize the pseudo-random sequence generator to C int .

[0402] In addition, l represents the OFDM symbol number in the time slot, n ID Same as the high-level parameter scramblingID.

[0403] In addition, for CSI-RS, resource element (RE) mapping is configured in the time domain and frequency domain through the high-level parameter CSI-RS-ResourceMapping.

[0404] Table 12 shows an example of CSI-RS-ResourceMapping IE.

[0405] [Table 12]

[0406]

[0407] In Table 12, density (D) represents the density of CSI-RS resources measured in RE / port / physical resource block (PRB), and nrofPorts represents the number of antenna ports.

[0408] In addition, the UE reports the measured CSI to the BS (S12030).

[0409] Here, when the amount of CSI-ReportConfig of Table 12 is configured as "None (or No Report)", the UE may skip reporting.

[0410] However, even when the quantity is configured as "None (or No Report)", the UE may report the measured CSI to the BS.

[0411] The case where the quantity is configured as "None (or No Report)" is the case where an aperiodic TRS is triggered or the case where repetition is configured.

[0412] Here, the UE may be defined to skip reporting only if repetition is configured as "ON".

[0413] In summary, when repetition is configured as "ON" and "OFF", "No Report", "SSB Resource Indicator (SSBRI) and L1-RSRP", and "CSI-RS Resource Indicator (CRI) and L1-RSRP" are all available as CSI reports.

[0414] Alternatively, when repetition is "OFF", a CSI report of "SSBRI and L1-RSRP" or "CRI and L1-RSRP" may be defined as being sent, and when repetition is "ON", "no report", "SSBRI and L1-RSRP" or "CRI and L1-RSRP" may be defined as being sent.

[0415] CSI Measurement and Reporting Process

[0416] The NR system supports more flexible and dynamic CSI measurement and reporting.

[0417] The CSI measurement may include a process of acquiring CSI by receiving a CSI-RS and calculating the received CSI-RS.

[0418] As time domain behavior of CSI measurement and reporting, aperiodic / semi-persistent / periodic channel measurement (CM) and interference measurement (IM) are supported.

[0419] The 4-port NZP CSI-RS RE pattern is used to configure CSI-IM.

[0420] NR’s CSI-IM based IMR has a similar design to LTE’s CSI-IM and is configured independently from the ZP CSI-RS resources used for PDSCH rate matching.

[0421] In addition, in ZP CSI-RS based IMR, each port simulates the interference layer of NZP CSI-RS with (preferred channel and) precoded.

[0422] This is for intra-cell interference measurement for multi-user situations and is mainly targeted at MUs.

[0423] The BS sends the precoded NZP CSI-RS to the UE on each port of the configured NZP CSI-RS based IMR.

[0424] The UE assumes a channel / interference layer for each port and measures the interference.

[0425] Regarding the channel, when there is no PMI and RI feedback, multiple resources are configured in a set and the base station or network indicates a subset of NZP CSI-RS resources through DCI regarding channel / interference measurement.

[0426] Resource settings and resource setting configurations will be described in more detail.

[0427] Resource Settings

[0428] Each CSI resource setting "CSI-ResourceConfig" includes the configuration of S≥1 CSI resource sets (given by the higher layer parameter csi-RS-ResourceSetList).

[0429] Here, the CSI resource setting corresponds to CSI-RS-resourcesetlist.

[0430] Here, S represents the number of configured CSI-RS resource sets.

[0431] Here, the configuration of S≥1 CSI resource sets includes each CSI resource set including CSI-RS resources (composed of NZP CSI-RS or CSI IM) and SS / PBCH block (SSB) resources for L1-RSRP calculation.

[0432] Each CSI resource setting is located in a DL bandwidth part (BWP) identified by the higher layer parameter bwp-id.

[0433] In addition, all CSI resource settings linked to a CSI reporting setting have the same DL BWP.

[0434] The time domain behavior of the CSI-RS resource within the CSI resource setting included in the CSI-ResourceConfig IE is indicated by the higher layer parameter resourceType and can be configured as aperiodic, periodic, or semi-persistent.

[0435] Regarding periodic and semi-persistent CSI resource settings, the number S of configured CSI-RS resource sets is limited to "1".

[0436] The configured periodicity and slot offset are given in the parameter set that sets the associated DL BWP given by bwp-id for periodic and semi-persistent CSI resources.

[0437] When the UE is configured with multiple CSI-ResourceConfigs including the same NZP CSI-RS resource ID, the same time domain behavior is configured for the CSI-ResourceConfigs.

[0438] When the UE is configured with multiple CSI-ResourceConfigs including the same CSI-IM resource ID, the same time domain behavior is configured for the CSI-ResourceConfigs.

[0439] Next, one or more CSI resource settings for channel measurement (CM) and interference measurement (IM) are configured through higher layer signaling.

[0440] -CSI-IM resources used for interference measurement.

[0441] - NZP CSI-RS resources for interference measurement.

[0442] - NZP CSI-RS resources for channel measurement.

[0443] That is, the channel measurement resource (CMR) may be the NZP CSI-RS, and the interference measurement resource (IMR) may be the NZP CSI-RS for CSI-IM and IM.

[0444] Here, CSI-IM (or ZP CSI-RS for IM) is mainly used for inter-cell interference measurement.

[0445] In addition, the NZP CSI-RS for IM is mainly used for intra-cell interference measurement from multiple users.

[0446] The UE may assume that, for each resource, the CSI-RS resources for channel measurement and the CSI-IM / NZP CSI-RS resources for interference measurement configured for one CSI report are "QCL-Type D".

[0447] Resource Settings Configuration

[0448] As mentioned, a resource setting may refer to a list of resource sets.

[0449] In each state configured using the higher layer parameter CSI-AperiodicTriggerState for aperiodic CSI, each CSI-ReportConfig is associated with one or more CSI-ReportConfigs linked to periodic, semi-persistent or aperiodic resource settings.

[0450] One report setup can be linked to up to three resource setups.

[0451] - When a resource setting is configured, the resource setting (given by the higher layer parameter resourcesForChannelMeasurement) is used for channel measurement for L1-RSRP calculation.

[0452] - When two resource settings are configured, the first resource setting (given by the higher layer parameter resourcesForChannelMeasurement) is used for channel measurement and the second resource setting (given by csi-IM-ResourcesForInterference or nzp-CSI-RS-ResourcesForInterference) is used for interference measurements performed on CSI-IM or NZP CSI-RS.

[0453] -When three resource settings are configured, the first resource setting (given by resourcesForChannelMeasurement) is used for channel measurement, the second resource setting (given by csi-IM-ResourcesForInterference) is used for CSI-IM based interference measurement, and the third resource setting (given by nzp-CSI-RS-ResourcesForInterference) is used for NZP CSI-RS based interference measurement.

[0454] Each CSI-ReportConfig is linked to a periodic or semi-persistent resource setting for a semi-persistent or periodic CSI.

[0455] - When a resource setting is configured (given by resourcesForChannelMeasurement), this resource setting is used for channel measurement for L1-RSRP calculation.

[0456] - When two resource settings are configured, the first resource setting (given by resourcesForChannelMeasurement) is used for channel measurement and the second resource setting (given by the higher layer parameter csi-IM-ResourcesForInterference) is used for interference measurements performed on CSI-IM.

[0457] CSI measurement-related CSI calculation will be described.

[0458] When interference measurement is performed on the CSI-IM, each CSI-RS resource used for channel measurement is associated with the CSI-IM resource of each resource in the order of the CSI-RS resources and the CSI-IM resources in the corresponding resource set.

[0459] The number of CSI-RS resources used for channel measurement is equal to the number of CSI-IM resources.

[0460] Additionally, when performing interference measurement in NZP CSI-RS, the UE does not expect one or more NZP CSI-RS resources in an associated resource set within a resource setting configured for channel measurement.

[0461] A UE configured with the higher layer parameter nzp-CSI-RS-ResourcesForInterference is not expected to have 18 or more NZP CSI-RS ports configured in the NZP CSI-RS resource set.

[0462] For CSI measurement, the UE assumes the following.

[0463] - Each NZP CSI-RS port configured for interference measurement corresponds to an interfering transmission layer.

[0464] - The energy per resource element (EPRE) ratio is considered among all interfering transmission layers of the NZP CSI-RS ports used for interference measurement.

[0465] - Different interference signals on REs of NZP CSI-RS resources for channel measurement, NZP CSI-RS resources for interference measurement, or CSI-IM resources for interference measurement.

[0466] The CSI reporting process will be described in more detail.

[0467] For CSI reporting, the time resources and frequency resources that the UE can use are controlled by the BS.

[0468] The channel state information (CSI) may include at least one of a channel quality indicator (CQI), a precoding matrix indicator (PMI), a CSI-RS resource indicator (CRI), a SS / PBCH block resource indicator (SSBRI), a layer indicator (LI), a rank indicator (RI), and L1-RSRP.

[0469] For CQI, PMI, CRI, SSBRI, LI, RI and L1-RSRP, the UE is configured by higher layers with N≥1 CSI-ReportConfig reporting settings, M≥1 CSI-ResourceConfig resource settings and a list of one or two trigger states (provided by aperiodicTriggerStateList and semiPersistentOnPUSCH).

[0470] In aperiodicTriggerStateList, each trigger state includes a channel and an associated CSI-ReportConfigs list optionally indicating a resource set ID for interference.

[0471] In semiPersistentOnPUSCH-TriggerStateList, each trigger state includes an associated CSI-ReportConfig.

[0472] In addition, the time domain behavior of CSI reporting supports periodic, semi-persistent and aperiodic.

[0473] Hereinafter, each of periodic, semi-persistent (SP), and aperiodic CSI reporting will be described.

[0474] Periodic CSI reporting is performed on short PUCCH and long PUCCH.

[0475] The periodicity and slot offset of periodic CSI reporting may be configured as RRC and refer to CSI-ReportConfig IE.

[0476] Next, SPCSI reporting is performed on short PUCCH, long PUCCH or PUSCH.

[0477] In case of SP CSI on short / long PUCCH, periodicity and slot offset are configured to RRC, and CSI reporting of separate MAC CE is enabled / disabled.

[0478] In the case of SP CSI on PUSCH, the periodicity of SP CSI reporting is configured through RRC, but the slot offset is not configured through RRC, and SP CSI reporting is enabled / disabled through DCI (Format 0_1).

[0479] The initial CSI reporting timing follows the PUSCH time domain allocation value indicated in the DCI, and the subsequent CSI reporting timing follows the periodicity configured through RRC.

[0480] A separate RNTI (SP-CSI C-RNTI) is used for SP CSI reporting on PUSCH.

[0481] DCI format 0_1 ​​may include a CSI request field and may enable / disable a specific configured SP-CSI triggering state.

[0482] Additionally, SP CSI reporting has the same or similar activation / deactivation mechanism as with data transmission on SPS PUSCH.

[0483] Next, aperiodic CSI reporting is performed on PUSCH and triggered by DCI.

[0484] In case of AP CSI with AP CSI-RS, the AP CSI-RS timing is configured by RRC.

[0485] Here, the timing of AP CSI reporting is dynamically controlled by DCI.

[0486] NR does not adopt the scheme in LTE of dividing and reporting CSI in multiple reporting instances applied to PUCCH-based CSI reporting (e.g., sending RI, WB PMI / CQI, and SB PMI / CQI in sequence).

[0487] In contrast, NR restricts not configuring specific CSI reporting in short / long PUCCH and defines CSI omission rules.

[0488] In addition, regarding the AP CSI reporting timing, the PUSCH symbol / slot position is dynamically indicated by the DCI. In addition, the candidate slot offset is configured by the RRC.

[0489] For CSI reporting, a slot offset (Y) is configured for each reporting setting.

[0490] For UL-SCH, the slot offset K2 is configured separately.

[0491] Two CSI delay categories (low delay category and high delay category) are defined in terms of CSI calculation complexity.

[0492] The low-latency CSI is WB CSI including up to 4-port Type-I codebook or up to 4-port non-PMI feedback CSI.

[0493] High-latency CSI refers to CSI other than low-latency CSI.

[0494] For a normal UE, (Z, Z') is defined in units of OFDM symbols.

[0495] Z represents the minimum CSI processing time from receiving the aperiodic CSI triggering DCI to performing CSI reporting.

[0496] Z' represents the minimum CSI processing time from receiving the CSI-RS for the channel / interference to performing CSI reporting.

[0497] In addition, the UE reports the number of CSIs that can be calculated simultaneously.

[0498] Below, Table 13 shows the CSI report configuration defined in TS38.214.

[0499] [Table 13]

[0500]

[0501]

[0502] In addition, the following Table 14 shows information related to activation / deactivation / triggering of MAC-CE related to semi-persistent / aperiodic CSI reporting defined in TS38.321.

[0503] [Table 14]

[0504]

[0505] Downlink transmit / receive operation

[0506] Fig.19 is a diagram showing an example of a downlink transmission / reception operation between a BS and a UE.

[0507] - The BS may schedule downlink transmission, such as frequency / time resources, transmission layer, downlink precoder, MCS, etc. (S1901). Specifically, the BS may determine a beam for PDSCH transmission to the UE through the above operations.

[0508] - The UE receives downlink control information (DCI) for downlink scheduling (ie, scheduling information including PDSCH) on the PDCCH (S1902).

[0509] DCI format 1_0 or 1_1 may be used for downlink scheduling. Specifically, DCI format 1_1 includes the following information:

[0510] Identifier of the DCI format, bandwidth part indicator, frequency domain resource assignment, time domain resource assignment, PRB bundling size indicator, rate matching indicator, ZP CSI-RS trigger, antenna port, transmission configuration indication (TCI), SRS request, and demodulation reference signal (DMRS) sequence initialization.

[0511] Specifically, according to the respective states indicated in the antenna port field, the number of DMRS ports can be scheduled, and single user (SU) / multi-user (MU) transmission scheduling is also available.

[0512] In addition, the TCI field is configured of 3 bits and indicates a maximum of 8 TCI states to dynamically QCL for DMRS according to the TCI field value.

[0513] - The UE receives downlink data from the BS on the PDSCH (S1903).

[0514] When the UE detects a PDCCH including DCI format 1_0 or 1_1, the UE decodes the PDSCH according to an indication of the corresponding DCI.

[0515] Here, when the UE receives a PDSCH scheduled by DCI format 1, the DMRS configuration type can be configured in the UE through the high-level parameter "dmrs-Type", and the DMRS type is used to receive the PDSCH. In addition, in the UE, the maximum number of front-loaded DMRA symbols for PDSCH can be configured through the high-level parameter "maxLength".

[0516] In case of DMRS configuration type 1, when a single codeword is scheduled and antenna ports mapped to indices {2, 9, 10, 11, or 30} are specified in the UE or when two codewords are scheduled in the UE, the UE assumes that all remaining orthogonal antenna ports are not associated with PDSCH transmission to another UE.

[0517] Alternatively, in case of DMRS configuration type 2, when a single codeword is scheduled and antenna ports mapped to indices {2, 10, or 23} are specified in the UE or when two codewords are scheduled in the UE, the UE assumes that all remaining orthogonal antenna ports are not associated with PDSCH transmission to another UE.

[0518] When the UE receives the PDSCH, the precoding granularity P' may be assumed to be continuous resource blocks in the frequency domain. Here, P' may correspond to a value among {2, 4, and wideband}.

[0519] When P' is determined to be wideband, the UE predicts that the PDSCH is not scheduled to non-contiguous PRBs, and the UE may assume that the same precoding is applied to the allocated resources.

[0520] Conversely, when P' is determined to be any one of {2 and 4}, the precoding resource block group (PRG) is partitioned into P' consecutive PRBs. The actual number of consecutive PRBs in each PRG may be one or more. The UE may assume that the same precoding is applied to consecutive downlink PRBs in a PRG.

[0521] To determine the modulation order, target code rate, and transport block size in PDSCH, the UE first reads the 5-bit MCD field in the DCI and determines the modulation order and target code rate. In addition, the UE reads the redundancy version field in the DCI and determines the redundancy version. In addition, the UE uses the number of layers before rate matching and the total number of allocated PRBs to determine the transport block size.

[0522] Uplink transmit / receive operation

[0523] Fig. 20 is a diagram showing an example of uplink transmission / reception operations between a BS and a UE.

[0524] - The BS schedules uplink transmission, such as frequency / time resources, transmission layer, uplink precoder, MCS, etc. (S2001). Specifically, the BS can determine the beam for PUSCH transmission of the UE through the above operations.

[0525] - The UE receives DCI for downlink scheduling (ie, including scheduling information of the PUSCH) from the BS on the PDCCH (S2002).

[0526] DCI format 0_0 or 0_1 may be used for uplink scheduling. Specifically, DCI format 0_1 ​​includes the following information:

[0527] DCI format identifier, UL / supplementary uplink (SUL) indicator, bandwidth part indicator, frequency domain resource assignment, time domain resource assignment, frequency hopping flag, modulation and coding scheme (MCS), SRS resource indicator (SRI), precoding information and number of layers, antenna port, SRS request, DMRS sequence initialization, and uplink shared channel (UL-SCH) indicator

[0528] Specifically, the SRS resources configured in the SRS resource set associated with the high-level parameter "usage" may be indicated by the SRS resource indicator field. In addition, "spatialRelationInfo" may be configured for each SRS resource, and the value of "spatialRelationInfo" may be one of {CRI, SSB, and SRI}.

[0529] PUSCH transmission supports two transmission schemes, ie, codebook-based transmission and non-codebook-based transmission.

[0530] i) When the higher layer parameter "txConfig" is set to "codebook", the UE is configured for codebook-based transmission. Conversely, when the higher layer parameter "txConfig" is set to "nonCodebook", the UE is configured for non-codebook-based transmission. When the higher layer parameter "txConfig" is not configured, the UE predicts that PUSCH is not scheduled by DCI format 0_1. When PUSCH is scheduled by DCI format 0_0, PUSCH transmission is based on a single antenna port.

[0531] In the case of codebook based transmission, the PUSCH may be scheduled by DCI format 0_0 or DCI format 0_1 ​​or semi-statically scheduled. When the PUSCH is scheduled by DCI format 0_1, the UE determines the PUSCH transmission precoder based on the SRI from the DCI as given by the SRS resource indicator field and the precoding information and layer number field, the transmit precoding matrix indicator (TPMI) and the transmission rank. The TPMI is used to indicate the precoder to be applied on the antenna port, and when multiple SRS resources are configured, the TPMI corresponds to the SRS resource selected by the SRI. Alternatively, when a single SRS resource is configured, the TPMI is used to indicate the precoder to be applied on the antenna port and corresponds to the corresponding single SRS resource. The transmission precoder is selected from the uplink codebook with the same number of antenna ports as the high-level parameter "nrofSRS-Ports". When the UE is configured with the high-level parameter "txConfig" set to "codebook", at least one SRS resource is configured in the UE. The SRI indicated in slot n is associated with the most recent transmission of the SRS resource identified by the SRI, and here, the SRS resource precedes the PDCCH carrying the SRI (ie, slot n).

[0532] ii) In the case of non-codebook based transmission, the PUSCH may be scheduled by DCI format 0_0 or DCI format 0_1 ​​or semi-statically. When multiple SRS resources are configured, the UE may determine the PUSCH precoder and transmission rank based on a wideband SRI, and here, the SRI is given by the SRS resource indicator in the DCI or by the high-level parameter "srs-ResourceIndicator". The UE may use one or more SRS resources for SRS transmission, and here, the number of SRS resources for simultaneous transmission in the same RB may be configured based on the UE capability. Only one SRS port is configured for each SRS resource. Only one SRS resource may be configured as the high-level parameter "usage" set to "nonCodebook". The maximum number of SRS resources that can be configured for non-codebook based uplink transmission is 4. The SRI indicated in slot n is associated with the most recent transmission of the SRS resource identified by the SRI, and here, the SRS transmission precedes the PDCCH carrying the SRI (i.e., slot n).

[0533] The high-level parameter "txConfig" may be included in a specific high-level parameter. The specific high-level parameter may be "PUSCHconfig". "PUSCH config" may be included in a PUSCH config information element (IE) and used to configure specific PUSCH parameters applicable to a BWP specific to the UE. The PUSCH config IE may be configured as shown in Table 15 below.

[0534] [Table 15]

[0535]

[0536]

[0537] The information included in the PUSCH Config field of Table 15 above is shown in Table 16 below.

[0538] [Table 16]

[0539]

[0540]

[0541] In addition, information included in the UCI-OnPUSCH field of the above Table 15 is shown in the following Table 17.

[0542] [Table 17]

[0543]

[0544] In addition, when txConfig is configured as a codebook, the codebookBased field in Table 15 above needs to exist in PUSCHConfig, otherwise, the codebookBased field does not exist.

[0545] Uplink transmission codebook

[0546] The codeword may be transformed into a bit sequence scrambled by a scrambler. A scrambling sequence for scrambling may be generated based on an initialization value, and the initialization value may include ID information of the wireless device, etc. The scrambled bit sequence may be modulated into a modulation symbol sequence by a modulator. The complex modulation symbol sequence may be mapped to one or more transmission layers by a layer mapper. The modulation symbols of each transmission layer may be mapped to the corresponding antenna port by a precoder. In this case, the mapping of the modulation symbols of each transmission layer to the antenna port corresponds to precoding.

[0547] More specifically, precoding can be performed by the following formula.

[0548] [Formula 8]

[0549]

[0550] In this formula, it can be satisfied and And W may be a precoding matrix. The precoding matrix may even be denoted as a precoder.

[0551] In non-codebook based transmission, the precoding matrix W may be the identity matrix.

[0552] In codebook-based transmission, for single-layer transmission (W=1), the precoding matrix W may be 1. In other cases, i.e., for transmission of 2 or more layers, the precoding matrix W may be obtained based on the following Tables 18 to 24 and downlink control information or higher layer parameters for scheduling uplink transmission.

[0553] In addition, when the high-layer parameter txConfig is not configured, the precoding matrix W may be 1 (W=1).

[0554] Table 18 below shows a codebook of a precoding matrix W for single layer transmission using two antenna ports.

[0555] [Table 18]

[0556]

[0557]

[0558] A transmit precoding matrix indicator (TPMI) index is indexed according to an ascending order from the left side to the right side of the table with respect to the precoding matrices included in the codebook of Table 18.

[0559] Table 19 shows a codebook of the precoding matrix W for single-layer transmission using four antenna ports. Specifically, Table 19 relates to a case where the configuration of a higher layer parameter (transform precoder) is set to "enabled".

[0560] [Table 19]

[0561]

[0562] A transmit precoding matrix indicator (TPMI) index is indexed according to an ascending order from the left side to the right side of the table with respect to the precoding matrices included in the codebook of Table 19.

[0563] Table 20 shows a codebook of the precoding matrix W for single-layer transmission using four antenna ports. Specifically, Table 20 relates to a case where the configuration of a higher layer parameter (transform precoder) is set to "disabled".

[0564] [Table 20]

[0565]

[0566]

[0567] A transmit precoding matrix indicator (TPMI) index is indexed according to an ascending order from the left side to the right side of the table with respect to the precoding matrices included in the codebook of Table 19.

[0568] Table 21 shows a codebook of a precoding matrix W for rank 2 transmission (or 2-layer transmission) using two antenna ports. Specifically, Table 21 relates to a case where the configuration of a higher layer parameter (transform precoder) is set to "disabled".

[0569] [Table 21]

[0570]

[0571] The transmit precoding matrix indicator (TPMI) index is indexed according to an ascending order from the left to the right of the table with respect to the precoding matrices included in the codebook of Table 21.

[0572] Table 22 shows a codebook of a precoding matrix W for rank 2 transmission (or 2-layer transmission) using four antenna ports. Specifically, Table 22 relates to a case where the configuration of a higher layer parameter (transform precoder) is set to "disabled".

[0573] [Table 22]

[0574]

[0575]

[0576] Transmitted precoding matrix indicator (TPMI) indexes are indexed according to ascending order from the left to the right of the table with respect to precoding matrices included in the codebook of Table 22.

[0577] Table 23 shows a codebook of a precoding matrix W for rank 3 transmission (or 3-layer transmission) using four antenna ports. Specifically, Table 23 relates to a case where the configuration of a higher layer parameter (transform precoder) is set to "disabled".

[0578] [Table 23]

[0579]

[0580] The transmit precoding matrix indicator (TPMI) index is indexed according to an ascending order from the left to the right of the table with respect to the precoding matrices included in the codebook of Table 23.

[0581] Table 24 shows a codebook of a precoding matrix W for rank-4 transmission (or 4-layer transmission) using four antenna ports. Specifically, Table 24 relates to a case where the configuration of a higher layer parameter (transform precoder) is set to "disabled".

[0582] [Table 24]

[0583]

[0584] The transmit precoding matrix indicator (TPMI) index is indexed according to an ascending order from the left to the right of the table with respect to the precoding matrices included in the codebook of Table 23.

[0585] Downlink control information for codebook-based uplink transmission

[0586] Downlink control information (DCI) of format 0_1 ​​may be used to schedule a physical uplink shared channel (PUSCH) in one cell. In addition, downlink control information of format 0_1 ​​may be used for codebook-based uplink transmission.

[0587] DCI format 0_1 ​​with CRC scrambled to C-RNTI, CS-RNTI, SP-CSI-RNTI or MCS-C-RNTI may include the following information.

[0588] -DCI format identifier - size is 1 bit

[0589] - This field may be configured to be 0 continuously in order to indicate a UL DCI format.

[0590] - Carrier indicator - size is 0 or 3 bits

[0591] -UL / SUL indicator - size is 0 bits or 1 bit

[0592] - Bandwidth fraction indicator - size 0, 1 or 2 bits

[0593] - Frequency domain resource assignment

[0594] -Time domain resource assignment - size is 0, 1, 2, 3 or 4 bits

[0595] -Frequency Hopping Flag - size is 0 or 1 bit

[0596] - Modulation and coding scheme - size is 5 bits

[0597] - New Data Indicator - size 1 bit

[0598] - Redundancy version - size is 2 bits

[0599] -HARQ process number - size is 4 bits

[0600] -TPC scheduling PUSCH command - size is 2 bits

[0601] -SRS resource indicator

[0602] - Precoding information and number of layers

[0603] The size of the field "precoding information and number of layers" can be configured differently based on the number of antenna ports used by the UE for uplink transmission and high-level parameters. The high-level parameters may include "txConfig", "transform precoder", "maxRank" and "codebooksubset". Here, "maxRank" can be used to configure the maximum transmission rank that the UE can use for uplink transmission. In addition, the information included in "codebooksubset" can be determined based on capability information related to the phase difference maintenance capability between the antenna ports of the UE reported to the BS by the UE, and the BS can send "codebooksubset" to the UE through high-level signaling. The UE can determine the codebook subset used for uplink transmission based on the "codebooksubset" received from the BS.

[0604] - Antenna port - size is 2 to 5 bits

[0605] The following Table 25 shows an example of a bandwidth part indicator included in DCI format 0_1.

[0606] [Table 25]

[0607]

[0608] Table 26 below shows an example of a codebook subset configuration for codebook-based uplink transmission of a UE. Specifically, Table 26 below relates to a case where the UE uses four antenna ports for uplink transmission, is configured with a high-level parameter "maxRank" of a value of 2, 3, or 4 from the BS, and is configured with a high-level parameter "transform precoder" configured to be disabled. In this case, the layer number field and precoding values ​​included in DCI format 0_1 ​​may be mapped by the UE to one of the indexes in Table 26 below based on the value of the high-level parameter "codebookSubset" configured from the BS.

[0609] [Table 26]

[0610]

[0611]

[0612] Table 27 below shows an example of a codebook subset configuration for codebook-based uplink transmission of a UE. Specifically, Table 27 below relates to a case where the UE uses four antenna ports for uplink transmission, is configured with a high-level parameter "maxRank" of 1 from the BS, and is configured with a high-level parameter "transform precoder" configured to be enabled or disabled. In this case, the layer number field and precoding values ​​included in DCI format 0_1 ​​may be mapped by the UE to one of the indexes in Table 27 below based on the value of the high-level parameter "codebookSubset" configured from the BS.

[0613] [Table 27]

[0614]

[0615] Table 28 below shows an example of a codebook subset configuration for codebook-based uplink transmission of a UE. Specifically, Table 28 below relates to a case where the UE uses two antenna ports for uplink transmission and is configured with a high-layer parameter "maxRank" having a value of 2 from the BS. In this case, the layer number field and precoding values ​​included in DCI format 0_1 ​​may be mapped by the UE to one of the indexes in Table 28 below based on the value of the high-layer parameter "codebookSubset" configured from the BS.

[0616] [Table 28]

[0617]

[0618]

[0619] Table 29 below shows an example of a codebook subset configuration for codebook-based uplink transmission of a UE. Specifically, Table 29 below relates to a case where the UE uses two antenna ports for uplink transmission, is configured with a high-level parameter "maxRank" of 1 from the BS, and is configured with a high-level parameter "transform precoder" configured to be disabled. In this case, the layer number field and the precoding value included in the DCI format 0_1 ​​may be mapped by the UE to one of the indexes in Table 29 below based on the value of the high-level parameter "codebookSubset" configured from the BS.

[0620] [Table 29]

[0621]

[0622] Uplink Power Control

[0623] In a wireless communication system, the transmission power of a terminal (e.g., a user equipment (UE) and / or a mobile device) may need to be increased or decreased depending on the situation. Therefore, controlling the transmission power of the UE and / or the mobile device may be referred to as uplink power control. As an example, a transmission power control scheme may be applied to meet requirements (e.g., signal-to-noise ratio (SNR), bit error rate (BER), block error rate (BLER), etc.) in a BS (e.g., gNB, eNB, etc.).

[0624] The above-mentioned power control may be performed through an open-loop power control scheme and a closed-loop power control scheme.

[0625] Specifically, the open-loop power control scheme means a scheme for controlling transmission power without feedback from a transmitting device (e.g., BS, etc.) to a receiving device (e.g., UE, etc.) and / or feedback from a receiving device to a transmitting device. As an example, a UE may receive a specific channel / signal (pilot channel / signal) from a BS and estimate the strength of received power using the received pilot channel / signal. Thereafter, the UE may control transmission power using the estimated strength of received power.

[0626] In contrast, a closed-loop power control scheme means a scheme for controlling transmission power based on feedback from a transmitting device to a receiving device and / or feedback from a receiving device to a transmitting device. As an example, a BS receives a specific channel / signal (pilot channel / signal) from a UE and determines an optimal power level for the UE based on a power level, SNR, BER, BLER, etc. measured through the received specific channel signal (pilot channel / signal). The BS may transmit information (i.e., feedback) about the determined optimal power level to the UE through a control channel, and the corresponding UE may control transmission power using the feedback provided by the BS.

[0627] Hereinafter, a power control scheme for a case in which a UE and / or a mobile device performs uplink transmission to a BS in a wireless communication system will be described in detail.

[0628] Specifically, the power control scheme for uplink data channel (e.g., physical uplink shared channel (PUSCH)) transmission will be described below. In this case, (i) the transmission timing (i.e., transmission time unit) of the PUSCH may be defined by a slot index n_s in a frame of a system frame number (SFN), a first symbol S in a slot, a number L of consecutive symbols, etc.

[0629] Power control of uplink data channels

[0630] Hereinafter, for convenience of description, a power control scheme will be described based on a case where a UE performs PUSCH transmission. The corresponding scheme can of course be widely applied to another uplink data channel supported in a wireless communication system.

[0631] In PUSCH transmission in the active uplink UL bandwidth part (UL BWP) of carrier f of serving cell c, the UE may calculate a linear power value of the transmission power determined by the following equation 9. Thereafter, the corresponding UE may control the transmission power by considering the calculated linear power value, the number of antenna ports and / or the number of SRS ports. The UE may scale the linear value by the ratio of the number of antenna ports with non-zero PUSCH transmission power to the maximum number of SRS ports supported by the UE in one SRS resource. The UE equally divides the power on the antenna ports where the UE transmits PUSCH with non-zero power.

[0632] Specifically, when the UE performs PUSCH transmission in the enabled UL BWP (b) of carrier f of serving cell c using the parameter set configuration based on index j and the PUSCH power control adjustment state based on index l, the UE may determine the PUSCH transmission power P in PUSCH transmission opportunity i based on the following equation 9: PUSCH,b,f,c (i,j,q d ,l)(dBm).

[0633] [Formula 9]

[0634]

[0635] In Equation 9, index j may represent the index of an open-loop power control parameter (e.g., Po, alpha (α), etc.), and up to 32 parameter sets may be configured per cell. Index q_d may represent the index of a DL RS resource for path loss (PL) measurement (e.g., PL b,f,c (q d )), and up to four measurement values ​​can be configured per cell. Index l can represent the index of the closed-loop power control process, and up to two processes can be configured per cell.

[0636] Specifically, as a parameter broadcast to some system information, Po (e.g., P O_PUSCH,b,f,c (j)) may represent the target received power on the receiving side. The corresponding Po value may be configured by considering the throughput of the UE, the capacity of the cell, noise and / or interference. In addition, α (e.g., α b,f,c (j)) may represent a ratio of compensation for path loss. α may be configured as a value from 0 to 1, and full path loss compensation or partial path loss compensation may be performed according to the configured value. In this case, the α value may be configured by considering interference between UEs and / or data speed. In addition, P CMAX,f,c (i) may represent the configured UE transmit power. As an example, the configured UE transmit power may be interpreted as the "configured maximum UE output power" defined in 3GPP TS 38.101-1 and / or TS38.101-2. In addition, The bandwidth of the PUSCH resource assignment may be represented as the number of resource blocks (RBs) used for PUSCH transmission opportunities based on the subcarrier spacing μ. In addition, the f related to the PUSCH power control adjustment state may be configured or indicated based on the TPC command field of the DCI (e.g., DCI format 0_0, DCI format 0_1, DCI format 2_2, DCI format 2_3, etc.). b,f,c (i,l).

[0637] In this case, a specific radio resource control (RRC) parameter (e.g., SRI-PUSCHPowerControl-Mapping, etc.) may indicate a connection between an SRS resource indicator (SRI) field of downlink control information (DCI) and indexes j, q_d, and l. In other words, indexes j, l, and q_d may be associated with a beam, a panel, and / or a spatial domain transmission filter based on specific information. Therefore, PUSCH transmission power control in units of beams, panels, and / or spatial domain transmission filters may be performed.

[0638] Parameters and / or information for PUSCH power control may be configured individually (i.e., independently) for each BWP. In this case, the parameters and / or information may be configured or indicated by higher layer signaling (e.g., RRC signaling, medium access control-control element (MAC-CE), etc.) and / or DCI. As an example, the parameters and / or information for PUSCH power control may be transmitted by RRC signaling PUSCH-ConfigCommon, PUSCH-PowerControl, etc., and PUSCH-ConfigCommon and PUSCH-PowerControl may be configured as shown in Table 30 below.

[0639] [Table 30]

[0640]

[0641]

[0642] The UE can determine or calculate the PUSCH transmission power through this scheme and send the PUSCH using the determined or calculated PUSCH transmission power.

[0643] Hereinafter, a method of transmitting an uplink signal based on a codebook will be described in detail.

[0644] In the present disclosure, UEs may be classified into three types based on capabilities related to transmission power that the UEs may use during uplink transmission. Fig.21 A classification scheme based on capabilities related to uplink transmission power of a UE is described in more detail.

[0645] Fig.21 is a diagram showing an example of a configuration scheme of a Tx chain of a UE.

[0646] More specifically, Fig.21 Configuration scheme of Tx chain for UE with power class 3 (23dBm).

[0647] Fig.21 (a-1) shows an example of a power class 3 UE using four antenna ports for uplink transmission, Fig.21 (a-2) shows an example of a power class 3 UE using two antenna ports for uplink transmission. Fig.21 (a-1) and Fig.21 As shown in (a-2), the case where all antenna ports used by the UE for uplink transmission can achieve a transmission power of 23dBm is defined as UE capability 1. Here, the antenna ports can be mapped to antenna elements through Tx virtualization, but for the convenience of description, they will be collectively referred to as antenna ports. UE capability 1 can be expressed as a first capability, a first capability type, etc., and of course can be expressed differently within the scope of the same or similar interpretation.

[0648] also, Fig.21 (b-1) shows an example of a power class 3 UE using four antenna ports for uplink transmission, Fig.21 (b-2) shows an example of a power class 3 UE using two antenna ports for uplink transmission. Fig.21 (b-1) and Fig.21As shown in (b-2), the case where a specific antenna port among the antenna ports used by the UE for uplink transmission cannot achieve 23dBm, that is, the case where any antenna port cannot achieve 23dBm is defined as UE capability 2. UE capability 2 can be expressed as a second capability, a second capability type, etc., and of course can be expressed differently within the scope of the same or similar interpretation.

[0649] also, Fig.21 (c-1) shows an example of a power class 3 UE using four antenna ports for uplink transmission, Fig.21 (c-2) shows an example of a power class 3 UE using two antenna ports for uplink transmission. Fig.21 (c-1) and Fig.21 As shown in (c-2), the case where only one specific antenna port among the antenna ports used by the UE for uplink transmission can achieve 23 dBm is defined as UE capability 3. UE capability 3 can be interpreted as a combination of UE capability 1 and UE capability 2. UE capability 3 can be expressed as a third capability, a third capability type, etc., and of course can be expressed differently within the scope of the same or similar interpretation.

[0650] Full power transmission of UE of UE capability 2 and UE of UE capability 3 may support the following scheme.

[0651] - The UE may be configured with one of two full power operation modes supporting UE capability 2 and UE capability 3 depending on the UE capability.

[0652] - The UE may be configured by the network to support full power transmission.

[0653] - Mode 1: The UE may be configured with one or more SRS resources of the same number as the number of SRS ports in the SRS resource set whose higher layer parameter "usage" is configured as "codebook".

[0654] In Mode 1, the BS (gNB) may be configured to use a subset of the transmit precoding matrix indicators for the ports in the combined layer to facilitate the UE to perform full power transmission of the UE.

[0655] In addition, in Mode 1, a new codebook subset may be used for rank values ​​that do not achieve full power transmission in the uplink. In this case, the new codebook may include the TPMI included in the codebook subset used when the higher layer parameter "codebookSubset" is configured as "fullyAndPartialAndNonCoherent".

[0656] In addition, in mode 1, at least non-antenna selective TPMI precoder may be supported.

[0657] Furthermore, in mode 1, non-antenna selective TPMI precoders may be additionally supported.

[0658] - Mode 2: The UE may be configured with one or more SRS resources whose number is different from the number of SRS ports in the SRS resource set whose higher layer parameter "usage" is configured as "codebook".

[0659] In mode 2, the UE may transmit SRS and PUSCH through the same scheme.

[0660] In addition, in mode 2, the codebooks in Tables 18 to 24 and the codebook subsets in Tables 26 to 29 may be used. Here, an antenna selection precoder may be used to enable a full-power related power amplifier (PA) to perform full-power transmission of UE capability 3.

[0661] In addition, in mode 2, uplink full power transmission may be implemented for PUSCH transmission according to the indicated SRI and / or TPMI. Here, a set of TPMIs for transmitting full power may be signaled by the UE for SRS resources of one or more ports to support at least UE capability 3. For example, when an SRI indicating SRS of multiple ports is transmitted based on Rel-15 MIMO operation, a 1-layer PUSCH may be transmitted at full power for an SRI indicating SRS resources of one port in the same manner as in a single-port SRS.

[0662] In addition, regarding 4Tx on the UE side (20+20+17+17dBm) virtualized by 2SRS ports, the case where full power transmission is allowed by precoder [0 1] or [1 0] is not included.

[0663] Furthermore, two or three SRS resources may be supported. In addition, with respect to 4Tx, one or more other TPMI / TPMI groups may support full power.

[0664] For full-power UL transmission of the UE, two modes may be supported / configured. The two modes may be Mode 1 and Mode 2. In the case of Mode 1, full-power uplink transmission is achieved by modifying the uplink codebook subset in Tables 26 to 29 that may be configured according to the coherent transmission capability of the UE. Coherent transmission capability may mean the ability of the UE to constantly maintain the difference between the phase values ​​applied to the antenna ports of the UE for uplink transmission between antenna ports. Coherent transmission capability may be expressed as phase difference maintenance capability, phase coherence maintenance capability, phase maintenance capability, etc., and of course may be expressed differently within the scope of the same or similar interpretation.

[0665] Based on the phase value difference maintaining capability between antenna ports (Tx ports), UEs can be classified into three types.

[0666] First, a UE that can constantly maintain the difference between the phase values ​​applied to the antenna ports for all antenna port pairs may be defined as a "fully coherent UE". The ability to constantly maintain the difference between the phase values ​​applied to the antenna ports for all antenna port pairs may be defined as "fully coherent". The difference in phase value may mean a difference on the frequency / time axis.

[0667] Secondly, a UE that can maintain the difference between the phase values ​​applied to the antenna ports only for some antenna port pairs and / or some antenna ports among all antenna port pairs may be defined as a "partially coherent UE". The ability to maintain the difference between the phase values ​​applied to the antenna ports only for some antenna port pairs among all antenna port pairs may be defined as "partially coherent". The difference in phase value may mean a difference in frequency / time axis.

[0668] Finally, a UE that cannot maintain the difference between the phase values ​​applied to the antenna ports for all antenna port pairs may be defined as a "non-coherent UE". That is, in the case of a "non-coherent UE", the difference between the phase values ​​applied to the antenna ports for transmitting uplink signals in all antenna port pairs may change. The ability to maintain the difference between the phase values ​​applied to the antenna ports for all antenna port pairs may be defined as "non-coherent". The difference in phase value may mean a difference on the frequency / time axis.

[0669] In the case of a non-coherent UE, the UE may be restricted to using only the port selection codebook for codebook-based uplink signal transmission. Table 31 below shows an example of a codebook for rank-1 uplink transmission using two antenna ports.

[0670] When the UE is a non-coherent UE and is restricted to using only the port selection codebook, the UE may use only the precoding matrices with TPMI indexes 0 and 1 among the precoding matrices included in the codebook of Table 31 below for uplink transmission. That is, the codebook for uplink transmission of rank 1 using two antenna ports includes only precoding matrices with TPMI indexes 0 and 1.

[0671] In this case, in the case of a UE of UE capability 2, since the UE transmits an uplink signal based on the power transmittable through only one antenna port, the UE may use only a transmission power of 20 dBm. Therefore, the UE may not use a transmission power of the full power transmission (23 dBm) value to transmit an uplink signal.

[0672] That is, only one antenna port is selected for uplink signal transmission of the UE based on the precoding matrix with TPMI index 0 and 1. Therefore, the UE uses only one antenna port to transmit the uplink signal, and Fig.21In the example of (b-2), since one antenna port can use only 20 dBm of transmission power, the UE transmits an uplink signal using only 20 dBm of transmission power through only one antenna port.

[0673] [Table 31]

[0674]

[0675] The present disclosure proposes a method for solving the problem that UE cannot perform uplink transmission based on full power transmission. More specifically, the present disclosure proposes a codebook subset configuration method that can facilitate the operation of UE in mode 1 and increase the uplink transmission performance of UE.

[0676] Hereinafter, a codebook subset configuration method for full power transmission of a non-coherent UE (Proposals 1 and 1-1) and a codebook subset configuration method for full power transmission of a partially coherent UE (Proposals 2, 2-1, 2-2, and 2-3) will be described.

[0677] Codebook subset configuration method for full power transmission of non-coherent UE

[0678] (Proposal 1) In case of non-coherent UEs, configure / apply a codebook subset for full power uplink transmission.

[0679] The codebook subset may be a codebook subset used by Rel-16 mode 1, non-coherent UEs.

[0680] More specifically, based on not maintaining the difference between the phase values ​​applied to the antenna ports for transmitting uplink signals in all antenna port pairs and / or antenna ports, the codebook subset for uplink signal transmission of the UE may include a specific precoding matrix for full-power uplink transmission. The specific precoding matrix may be a precoding matrix not included in the codebook subset of the "codebookSubset=nonCoherent" case of Tables 28 to 29. A UE as a non-coherent UE may perform full-power uplink transmission based on a specific precoding matrix. In this case, the UE may perform uplink transmission using all antenna ports among the antenna ports for uplink signal transmission. More specifically, the UE may receive information for determining a transmission power value for uplink transmission from the BS and determine the uplink transmission power based on the information. In this case, the determined uplink transmission power is divided into the same value and applied across all antenna ports for transmitting uplink signals. Below, when the UE performs full-power transmission based on the codebook subset proposed in the present disclosure, the above content may be similarly applied.

[0681] Hereinafter, for convenience of description, the precoding matrix may be expressed as TPMI, precoder, codeword, etc.

[0682] Table 32 below shows an example of a codebook subset for a case where a UE that is a non-coherent UE uses two antenna ports for uplink transmission and the value of 'maxRank' is 2.

[0683] [Table 32]

[0684]

[0685] In the above Table 32, the codebook subset for the "Rel-15, non-coherent UE" case and the codebook subset for the "Rel-16 mode 1, non-coherent UE" case may be configured based on the codebook of Table 18 and the codebook of Table 21.

[0686] The codebook subset for the "Rel-15, non-coherent UE" case is configured to be the same as the codebook subset for the "codebookSubset = nonCoherent" case in Table 28. Conversely, the codebook subset for the "Rel-16 mode 1, non-coherent UE" case may also include a precoding matrix having a TPMI index of 2 among the precoding matrices included in the codebook of Table 18 for rank 1.

[0687] Table 33 below shows an example of a codebook subset for a case where a UE that is a non-coherent UE uses four antenna ports for uplink transmission and a value of 'maxRank' is 4.

[0688] [Table 33]

[0689]

[0690] In the above Table 33, the codebook subset for the "Rel-15, non-coherent UE" case and the codebook subset for the "Rel-16 mode 1, non-coherent UE" case may be configured based on at least one of i) the codebook of Table 19 or the codebook of Table 20, ii) the codebook of Table 22, iii) the codebook of Table 23, or iv) the codebook of Table 24. When there is no separate description, for a UE that transmits an uplink signal using four antenna ports, the method for configuring the codebook subset for the "Rel-15, non-coherent UE" case and the codebook subset for the "Rel-16 mode 1, non-coherent UE" case is the same as the above method.

[0691] According to the above Table 33, the codebook subset of the “Rel-15, non-coherent UE” case may be configured to be the same as the codebook subset of the “codebookSubset=nonCoherent” case in Tables 26 and 27.

[0692] On the contrary, the codebook subset for the "Rel-16 mode 1, non-coherent UE" case may also include a precoding matrix with a TPMI index of 12 among the precoding matrices included in one of the codebooks in Table 19 or Table 20 for rank 1, a precoding matrix with a TPMI index of 6 among the precoding matrices included in the codebook of Table 22 for rank 2, and a precoding matrix with a TPMI index of 1 among the precoding matrices included in the codebook of Table 23 for rank 3.

[0693] The examples of Table 32 and Table 33 above are merely examples, and the method proposed in the present disclosure is not limited thereto.

[0694] In the case of a non-coherent UE, since the UE does not have the ability to maintain the relative phase difference between antenna ports, there may be no difference in uplink transmission performance even if the fully coherent UE selects any TPMI among the TPMIs used for uplink transmission. That is, regardless of which precoding matrix among the precoding matrices used by the fully coherent UE for uplink transmission is included in the codebook subset for uplink transmission of the non-coherent UE, the uplink transmission performance of the UE may be the same. More specifically, when the UE performs uplink transmission of rank 1 using two antenna ports, the uplink transmission performance may be the same even if the UE uses any TPMI among TPMIs 2 to 5 used by the fully coherent UE.

[0695] Therefore, the principle of Proposal 1 is to add a specific TPMI supporting full power transmission included in the codebook of the specific rank to the codebook subset of the specific rank for a specific rank that does not support full power uplink transmission. Specifically, Proposal 1 can be more preferably applied to the case of UEs with UE capability 2.

[0696] As another example of Table 32 above, TPMI 3, 4, or 5 may be added instead of TPMI 2 added to rank 1 of the codebook subset.

[0697] In addition, as another example of Table 33, a specific TPMI among TPMIs 13 to 27 other than TPMI 12 of rank 1 is added to the codebook subset, a specific TPMI among TPMIs 7 to 21 other than TPMI 6 of rank 2 is added to the codebook subset, and a specific TPMI among TPMIs 2 to 6 other than TPMI 1 of rank 3 is added to the codebook subset to configure a new codebook subset.

[0698] Specifically, in the case of rank 3, referring to Table 23, transmission power is uneven between layers in TPMI 1. Specifically, since the power of layer 0 is P / 2 and the power of layers 1 and 2 is P / 4 (here, P represents transmission power), the uplink transmission performance of the UE may be degraded according to the channel state.

[0699] Referring to the codebook of rank 3 of Table 23, it can be seen that the same transmission power is applied in TPMI 3. Therefore, in order to solve the problem of applying different transmission powers to each layer in uplink transmission of rank 3, a codebook subset for rank 3 including both TPMI 1 and TPMI 3 included in the codebook of rank 3 may be configured. Alternatively, a codebook subset including only TPMI 3 may be configured.

[0700] In addition, when the transmission rank of the UE is limited based on the RRC parameter "maxRank" indicator, the codebook subset can be configured even using the rank indicated by "maxRank" in the above Tables 32 and 33. More specifically, when a UE that transmits an uplink signal using four antenna ports is configured with a "maxRank" indicator indicating that the maximum transmission rank is 2, the codebook subset can be configured as shown in Table 34 below.

[0701] [Table 34]

[0702]

[0703] Therefore, according to the value of the maximum transmission rank configured based on the maxRank value, the configured codebook subset may include at least one precoding matrix of each rank. In this case, the precoding matrix of each rank may be expressed as a precoding matrix set. In summary, it can be understood that the codebook subset is configured with a structure including a precoding matrix set of each rank according to the value of the maximum transmission rank configured based on the maxRank value. The above content can even be similarly applied to the codebook subset configured based on the following method.

[0704] (Proposal 1-1) In the case of non-coherent UEs, the codebook subset based on limiting the maxRank in the UE's uplink transmission

[0705] When a UE transmitting uplink signals using four antenna ports is configured with a "maxRank" indicator indicating that the maximum transmission rank is 1, the codebook subset may be configured as shown in Table 35 below.

[0706] [Table 35]

[0707]

[0708] When the maximum transmission rank is limited to 1 (maxRank=1) in the case of a UE that transmits an uplink signal using four antenna ports, or in the case of DFT-s-OFDM (transmit precoding enabled), the TPMI for uplink transmission may be indicated to a UE that is a Rel-15, non-coherent UE based on a DCI including a TPMI field having a size of 2 bits. That is, the TPMI may be indicated to a UE that is a Rel-15, non-coherent UE only through four states (0, 1, 2, and 3).

[0709] On the contrary, in the case of a UE that is a Rel-16 mode 1, non-coherent UE, since a new TPMI is added to the codebook subset for full power uplink transmission, the size of the TPMI field of the DCI becomes 3 bits (0, 1, 2, 3, and 12). In this case, the proposal proposes a scheme for maximizing the use of the three remaining states. That is, in Proposal 1, only a single state (TPMI 12) is added and the remaining states are "reserved", but in Proposal 1-1, a scheme for utilizing all four states (TPMI12 to 15) is proposed.

[0710] Codebook subset configuration method for full power transmission of partially coherent UE

[0711] (Proposal 2) In case of partially coherent UEs, configure / apply a codebook subset for full power uplink transmission.

[0712] The codebook subset may be a codebook subset used by the UE as a Rel-16 mode 1, partially coherent UE.

[0713] Table 36 below shows an example of a codebook subset for a case where a UE that is a partially coherent UE uses four antenna ports for uplink signal transmission and a value of 'maxRank' is 4.

[0714] [Table 36]

[0715]

[0716] In the above Table 36, the codebook subset for the "Rel-15, partially coherent UE" case and the codebook subset for the "Rel-16 mode 1, partially coherent UE" case may be configured based on at least one of i) the codebook of Table 19 or the codebook of Table 20, ii) the codebook of Table 22, iii) the codebook of Table 23, or iv) the codebook of Table 24. When there is no separate description, for a UE that transmits an uplink signal using four antenna ports as a partially coherent UE, the method of configuring the codebook subset for the "Rel-15, partially coherent UE" case and the codebook subset for the "Rel-16 mode 1, partially coherent UE" case is the same as the above method.

[0717] According to the above Table 36, the codebook subset of the “Rel-15, partially coherent UE” case may be configured to be the same as the codebook subset of the “codebookSubset=partialAndNonCoherent” case in Tables 26 and 27.

[0718] On the contrary, unlike the case of "Rel-15, partially coherent UE", the codebook subset for the case of "Rel-16, mode 1, partially coherent UE" may also include precoding matrices with TPMI indexes of 12 to 15 among the precoding matrices included in one of the codebooks in Table 19 or Table 20 for rank 1.

[0719] The example in Table 36 above is only an example, and the method proposed in the present disclosure is not limited thereto.

[0720] In the case of a partially coherent UE, the UE partially has the ability to maintain the relative phase difference between antenna ports, that is, the phase difference is maintained only for some antenna ports among all antenna ports of the UE.

[0721] More specifically, each of antenna ports 0 and 2 (antenna port pair) and / or antenna ports 1 and 3 may have the ability to maintain a relative phase difference. Therefore, in this proposal, it is proposed that a codebook subset includes a specific TPMI group, which includes a relative phase change between antenna ports. For example, one of the four groups of TPMI 12 to 15 / 16 to 19 / 20 to 23 / 24 to 27 in the codebook of rank 1 may be included in the codebook subset.

[0722] In other words, in this proposal, based on maintaining a difference between phase values ​​of antenna ports applied to uplink signal transmission for UE in some antenna ports among all antenna port pairs and / or antenna port pairs, the codebook subset may include at least one specific precoding matrix to which different phase values ​​are applied to antenna ports included in all or some of these antenna ports and / or antenna port pairs.

[0723] The at least one specific precoding matrix may be a precoding matrix not included in the codebook subset of the "codebookSubset=partialAndNonCoherent" case of Table 26 and Table 27.

[0724] Table 36 above corresponds to an embodiment where a particular TPMI group includes TPMIs 12-15.

[0725] As another example, a specific TPMI group may be configured to include TPMIs 12, 17, 22, and 27. Therefore, differences in phase values ​​applied to antenna ports respectively included in antenna port pairs ((i) antenna ports 0 and 2 and (ii) antenna ports 1 and 3) may be diversified based on the configuration of the specific TPMI group.

[0726] More specifically, referring to Table 19, since TPMI 12 is Therefore, there is no phase difference between antenna ports 0 and 2, and there is a 180-degree phase difference between antenna ports 1 and 3. In addition, since TPMI 17 is Therefore, there is a phase difference of about 90 degrees between antenna ports 0 and 2, and a phase difference of about 90 degrees between antenna ports 1 and 3. In addition, since TPMI22 is So there is a phase difference of about 180 degrees between antenna ports 0 and 2, and no phase difference between antenna ports 1 and 3. Finally, since TPMI 27 is Therefore, there is a phase difference of about 270 degrees between antenna ports 0 and 2, and there is a phase difference of about 270 degrees between antenna ports 1 and 3. That is, in the case of TPMIs 11 to 15, the phase differences between antenna ports respectively included in some antenna port pairs having a phase difference maintaining capability may be applied identically, whereas when the TPMIs included in the codebook subset are configured in this way, the phase differences between antenna ports respectively included in the antenna port pairs may be applied differently.

[0727] Since the codebook subset for the "Rel-15, partially coherent UE" case already supports full power transmission of ranks 2 to 4, the precoding matrices of ranks 2 to 4 included in the codebook subset can be configured identically in both the "Rel-15, partially coherent UE" case and the "Rel-16, mode 1, partially coherent UE" case.

[0728] (Proposal 2-1) Codebook subset configured with maxRank 4 in uplink transmission of UE in case of partially coherent UE

[0729] When the UE as a Rel-16, Mode 1, partially coherent UE uses four antenna ports to send uplink signals and maxRank is configured to 4, the codebook subset can be configured as in Table 37 for full power uplink transmission.

[0730] [Table 37]

[0731]

[0732] When the maximum transmission rank is configured as 4 (maxRank=4) in the case of a UE that transmits an uplink signal using four antenna ports, the TPMI for uplink transmission may be indicated to a UE that is a Rel-15, partially coherent UE based on a DCI including a TPMI field having a size of 5 bits. That is, since the value obtained by adding all the TPMI states 12 of rank 1, 14 of rank 2, 3 of rank 3, and 3 of rank 3 is 12+14+3+3=32, the TPMI may be indicated to the UE based on a DCI including a TPMI field having a size of 5 bits.

[0733] On the contrary, referring to the above Table 36, since the value obtained by adding all the TPMI states 16 (TPMI 12 to 15 added) of rank 1, TPMI state 14 of rank 2, TPMI state 3 of rank 3, and TPMI state 3 of rank 3 is 16+14+3+3=36, the UE needs to include a DCI having a TPMI field of 6 bits in size in order to be indicated with TPMI and TRI. In this case, since only 36 states out of 64 (2^6) states are used, 28 states are reserved, and as a result, there may be a problem of aggravated state waste.

[0734] To solve the problem of state waste, the proposal proposes a method in which, when the UE is configured with maxRank=4, only the TPMIs of rank 1 included in the subset include one of the groups (e.g., TPMIs 12 to 15) where full power transmission is available in addition to non-coherent codewords (TPMIs 0 to 3).

[0735] In addition, in this proposal, an example of a codebook subset configuration for a case where the maximum transmission rank of a UE that transmits an uplink signal using four antenna ports is limited to maxRank=1 is shown in Table 38 below.

[0736] More specifically, when the maximum transmission rank of the UE is limited to maxRank=1, the codebook subset includes the same TPMI as the TPMI used for rank 1 transmission by the UE as a Rel-15, partially coherent UE, and may be configured to also include a group (e.g., TPMIs 12 to 15) available for full power transmission in the TPMI group of rank 1. That is, the TPMI of rank 1 included in the codebook subset may be a TPMI with a TPMI index of 1 to 15 among the TPMIs included in the codebook for rank 1 transmission using four antenna ports.

[0737] [Table 38]

[0738]

[0739] This principle can even be equally applied to the case of DFT-s-OFDM.

[0740] According to Proposal 2-1, the configuration of the rank 1 precoding matrix set (TPMI) included in the codebook subset may vary according to the maxRank indicated by RRC signaling. Through this codebook subset configuration scheme, the availability of the payload of the DCI indicating the TPMI and / or TRI may be maximized.

[0741] (Proposal 2-2) TPMI Reduction for Ranks 3 and 4 in the Case of Partially Coherent UEs

[0742] When a UE as a "Rel-16 Mode 1, partially coherent UE" transmits an uplink signal using four antenna ports and the maximum transmission rank is configured as maxRank=4, the codebook subset may be configured as in Table 39 for full power uplink transmission.

[0743] [Table 39]

[0744]

[0745] According to the above Table 39, the codebook subset of the “Rel-15, partially coherent UE” case may be configured to be the same as the codebook subset of the “codebookSubset=partialAndNonCoherent” case in Tables 26 and 27.

[0746] On the contrary, unlike the case of "Rel-15, partially coherent UE", the codebook subset of the case of "Rel-16, mode 1, partially coherent UE" may also include precoding matrices with TPMI indexes of 12 to 15 among the precoding matrices included in one of the codebooks of Table 19 or Table 20 for rank 1. In addition, unlike the case of "Rel-15, partially coherent UE", the codebook subset may include only TPMI 1 of rank 3 and only TPMI 0 of rank 4.

[0747] The proposal is a proposal to reduce the codebook subset of higher ranks (e.g., ranks 3 and 4) and add TPMIs (e.g., TPMIs 12 to 15) for full-power uplink transmission of rank 1. That is, the proposal involves a method of excluding two TPMIs from the codebook subset in each of ranks 3 and 4 and adding four TPMIs to the codebook subset of rank 1.

[0748] In the case of a higher rank, the throughput increase gain that can be obtained by greatly configuring the codebook size is not large. Therefore, TPMI for achieving full power is added to rank 1 instead of greatly configuring the codebook size, and as a result, there is an effect that the gain of achieving full power transmission can be further increased.

[0749] (Proposal 2-3) In the case of partially coherent UE, for full power uplink transmission, the codebook subset for the case of "codebookSubset=PartialAndNonCoherent" in Tables 26 to 29 may be used as is.

[0750] The above-mentioned proposed methods (Proposal 1 / Proposal 1-1 / Proposal 2 / Proposal 2-1 / Proposal 2-2 / Proposal 2-3) are classified only for convenience of description and do not limit the scope of the technical spirit of the methods proposed in the present disclosure. For example, the above-mentioned proposed methods are applied alone or configured by a combination of one or more proposed methods for codebook-based uplink transmission.

[0751] Fig. 22 The present invention is a flowchart showing an example of operations implemented in a UE for performing the method for transmitting an uplink signal based on a codebook in a wireless communication system proposed in this specification.

[0752] In more detail, in order to perform the method in which a UE transmits an uplink signal based on a codebook in a wireless communication system, the UE receives downlink control information (DCI) for determining a precoding matrix applied to uplink signal transmission (S2210).

[0753] Next, the UE determines a precoding matrix applied to uplink signal transmission from a codebook subset related to uplink signal transmission based on the DCI (S2220).

[0754] Finally, the UE sends an uplink signal to the base station based on the determined precoding matrix (S2230). Here, based on the difference change of the phase value applied to the antenna port for sending the uplink signal in all antenna port pairs, the codebook subset includes at least one specific precoding matrix for full power transmission.

[0755] Furthermore, based on the determined precoding matrix being one of the at least one specific precoding matrix, the uplink signal may be transmitted based on full power transmission.

[0756] Furthermore, based on the determined precoding matrix being one of the at least one specific precoding matrix, the uplink signal may be transmitted through all antenna ports for transmitting the uplink signal.

[0757] In addition, the codebook may include a first codebook for rank 1 for transmitting an uplink signal using two antenna ports and a second codebook for rank 2 for transmitting an uplink signal using two antenna ports. The codebook subset may be configured based on a precoding matrix included in each of the first codebook and the second codebook. Among the first precoding matrix set of rank 1 and the second precoding matrix set of rank 2 included in the codebook subset, the at least one specific precoding matrix may be included in the first precoding matrix set.

[0758] In addition, the precoding matrix included in each of the first codebook and the second codebook may be indexed by a TPMI (Transmit Precoding Matrix Indicator) index.

[0759] In addition, the first codebook is determined by the following table,

[0760] [Table 40]

[0761]

[0762] The TPMI index may be indexed in ascending order from left to right in the table of precoding matrices included in the first codebook.

[0763] In addition, the at least one specific precoding matrix may be a precoding matrix having a TPMI index of 2 among the precoding matrices included in the first codebook.

[0764] In addition, the codebook may further include (i) a first codebook associated with rank 1 for transmitting an uplink signal using four antenna ports, (ii) a second codebook associated with rank 2 for transmitting an uplink signal using four antennas, (iii) a third codebook associated with rank 3 for transmitting an uplink signal using four antennas, and (iv) a fourth codebook for transmitting an uplink signal using four antenna ports. The codebook set may be configured based on a precoding matrix included in each of the first to fourth codebooks.

[0765] Here, the at least one specific precoding matrix includes precoding matrices applied to the first rank, the second rank, and the third rank, respectively.

[0766] There are (i) a first precoding matrix set of rank 1 included in the codebook set, (ii) a second precoding matrix set of rank 2, (iii) a third precoding matrix set of rank 3, and (iv) a fourth precoding matrix set of rank 4, and for each rank, the at least one specific precoding matrix may be included in the first precoding matrix set of rank 1, the second precoding matrix set of rank 2, and the third precoding matrix set of rank 3.

[0767] In this case, the precoding matrix included in each of the first to fourth codebooks may be indexed by the TPMI index.

[0768] Here, the first codebook is determined by one of the following tables,

[0769] [Table 41]

[0770]

[0771] [Table 42]

[0772]

[0773] The second codebook is determined by the following table,

[0774] [Table 43]

[0775]

[0776]

[0777] The third codebook is determined by the following table,

[0778] [Table 44]

[0779]

[0780] Here, the TPMI index may be indexed in ascending order from left to right in a table of precoding matrices included in each of the first codebook, the second codebook, and the third codebook.

[0781] Here, the precoding matrix applied to rank 1 among the precoding matrices included in the at least one specific precoding matrix may be a precoding matrix with a TPMI index of 13 included in the precoding matrix in the first codebook, the precoding matrix applied to rank 2 among the precoding matrices included in the at least one specific precoding matrix may be a precoding matrix with a TPMI index of 6 included in the precoding matrix in the second codebook, and the precoding matrix applied to rank 3 among the precoding matrices included in the at least one specific precoding matrix may be a precoding matrix with a TPMI index of 1 included in the precoding matrix in the third codebook.

[0782] In addition, the UE may determine the uplink transmission power for uplink transmission based on the DCI. In this case, the DCI may also include information about the optimal power level for uplink transmission, and the determined uplink transmission power may be divided into the same value across all antenna ports for uplink signal transmission and applied.

[0783] In addition, configuration information about a maximum rank value for uplink signal transmission may be received from the base station. In this case, the first precoding matrix set included in the codebook subset may be differently configured based on the maximum rank value.

[0784] In addition, based on the maximum rank value being 1, the precoding matrix applied to rank 1 among the precoding matrices included in the at least one specific precoding matrix may be a precoding matrix having a TPMI index of 12 to 15 among the precoding matrices included in the first codebook.

[0785] In addition, the UE that transmits an uplink signal based on a codebook in a wireless communication system includes a transmitter for transmitting a radio signal, a receiver for receiving a radio signal, and a processor functionally connected to the transmitter and the receiver. In this case, the processor can control the transmitter and the receiver to perform a reference Fig. 22 Describes the operation.

[0786] Fig.23 The present invention is a flowchart showing an example of operations implemented in a base station for executing the method for transmitting an uplink signal based on a codebook in a wireless communication system proposed in this specification.

[0787] In more detail, in order to perform the method of transmitting an uplink signal based on a codebook in a wireless communication system, the base station transmits downlink control information (DCI) for determining a precoding matrix applied to uplink signal transmission to a UE (S2310).

[0788] Next, the base station receives an uplink signal from the UE according to the precoding matrix determined based on the DCI (S2320).

[0789] Here, the codebook subset includes at least one specific precoding matrix for full power transmission based on a difference change in a phase value applied to an antenna port for transmitting an uplink signal among all antenna port pairs in the UE.

[0790] In addition, a base station for receiving an uplink signal based on a codebook in a wireless communication system includes a transmitter for transmitting a radio signal, a receiver for receiving a radio signal, and a processor functionally connected to the transmitter and the receiver. In this case, the processor may control the transmitter and the receiver to perform a reference Fig.23 Describes the operation.

[0791] In addition, execute the reference Fig.23 The device of the described operation can be controlled by a processor. In more detail, in a device including one or more memories and one or more processors functionally connected to the one or more memories, the processor controls the device to receive downlink control information (DCI) from a base station for determining a precoding matrix applied to uplink signal transmission.

[0792] Next, the processor controls the device to determine a precoding matrix applied to uplink signal transmission from a codebook subset related to uplink signal transmission based on the DCI.

[0793] Finally, the processor controls the device to transmit an uplink signal to the base station based on the determined precoding matrix.

[0794] Here, the codebook subset includes at least one specific precoding matrix for full power transmission based on a difference change in a phase value applied to an antenna port for transmitting an uplink signal in all antenna port pairs.

[0795] In addition, it is obvious that the processor can control the device to execute the reference Fig.23 Describes the operation.

[0796] In addition, refer to Fig.23The described operations may be performed by a non-transitory computer readable medium (CRM) storing one or more commands. In more detail, one or more commands executable by one or more processors cause the UE to receive downlink control information (DCI) from a base station for determining a precoding matrix to be applied to uplink signal transmission.

[0797] Next, the command controls the UE to determine a precoding matrix applied to uplink signal transmission from a codebook subset related to uplink signal transmission based on the DCI.

[0798] Finally, the command causes the UE to transmit an uplink signal to the base station based on the determined precoding matrix.

[0799] Here, the codebook subset includes at least one specific precoding matrix for full power transmission based on a difference change in a phase value applied to an antenna port for transmitting an uplink signal in all antenna port pairs.

[0800] Example of signal transmission / reception process applied to the present disclosure

[0801] Fig.24 is a diagram showing an example of an uplink transmission signaling procedure to which the method proposed in the present disclosure is applicable.

[0802] An example of signaling between a BS and a UE for the above-proposed methods (Proposal 1 / Proposal 1-1 / Proposal 2 / Proposal 2-1 / Proposal 2-2 / Proposal 2-3) can be shown in Fig.24 middle. Fig.24 It is only for the convenience of description and does not limit the scope of the present disclosure.

[0803] also, Fig.24 Some of the steps described in the above may be combined or omitted. When performing the following process, the above CSI-related operations may be considered / applied. Fig.24 The operations of the BS and the UE in the communication network may be based on the above-mentioned uplink transmission / reception operations.

[0804] BS Operation

[0805] The base station (BS) may receive UE capability information from the user equipment (UE) (S105). For example, the UE capability information may include the number of supported antenna ports / coherent capability (e.g., nonCoherent, partialNonCoherent, fullCoherent) / full power transmission capability. When the UE capability information is predefined / agreed, the corresponding step may be omitted.

[0806] For example, the BS in step S105 (eg, Fig.26 100 / 200) from UE( Figure 26 to Figure 29The operation of receiving UE capability information can be performed as follows Figure 26 to Figure 29 For example, refer to Fig.26 , the one or more processors 102 may control the one or more transceivers 106 and / or the one or more memories 104 to receive the UE capability information, and the one or more transceivers 106 may receive the UE capability information from the UE.

[0807] The BS may send system information (SI) and / or scheduling information and / or CSI-related configuration and / or PUSCH-Config to the UE through a higher layer (eg, RRC or MAC CE). As an example, the information sent through the higher layer may be sent separately / independently.

[0808] For example, the BS ( Fig.26 100 / 200) to UE( Figure 26 to Figure 29 The operation of sending system information (SI) and / or scheduling information and / or CSI-related Config and / or PUSCH Config can be performed as follows Figure 26 to Figure 29 For example, refer to Fig.26 , one or more processors 102 may control one or more transceivers 106 and / or one or more memories 104 to send system information (SI) and / or scheduling information and / or CSI-related Config, and one or more transceivers 106 may send system information (SI) and / or scheduling information and / or CSI-related Config and / or PUSCH Config to the UE.

[0809] The BS may transmit an RS (eg, SSB, CSI-RS, TRS, PT-RS, etc.) to the corresponding UE in order to acquire information about a channel state (ie, DL CSI acquisition) (S115). As an example, the corresponding step may be based on a CSI-related operation.

[0810] For example, the BS in step S115 (eg, Fig.26 100 / 200) to UE( Figure 26 to Figure 29 The operation of sending DL CSI to obtain the related RS can be performed as follows Figure 26 to Figure 29 For example, refer to Fig.26 , the one or more processors 102 may control the one or more transceivers 106 and / or the one or more memories 104 to send the DL CSI acquisition related RS, and the one or more transceivers 106 may send the DL CSI acquisition related RS to the UE.

[0811] The BS may receive an RS (e.g., an SRS, etc.) from the corresponding UE in order to acquire information about the channel state (i.e., UL CSI acquisition). As an example, the corresponding step may be based on the above-mentioned CSI-related operation. As an example, the RS may be based on the channel information calculated based on the DL CSI acquisition-related RS in the above-mentioned step S115. In addition, the BS may receive the channel information together with the RS.

[0812] For example, the BS in step S120 (eg, Fig.26 100 / 200) from UE( Figure 26 to Figure 29 The operation of receiving UL CSI and obtaining related RS can be performed as follows Figure 26 to Figure 29 For example, refer to Fig.26 , the one or more processors 102 may control the one or more transceivers 106 and / or the one or more memories 104 to receive the UL CSI acquisition-related RS, and the one or more transceivers 106 may receive the UL CSI acquisition-related RS from the UE.

[0813] The BS may send UL scheduling information / precoding related information to the UE (S125). As an example, the precoding related information may include information about SRI / TPMI / TRI / MCS. As an example, the UL scheduling information / precoding related information may be DCI format 0-1 or DCI format 0-0. For example, the UL scheduling information / precoding related information may be determined / configured / indicated based on the above-mentioned proposed method (e.g., Proposal 1 / Proposal 1-1 / Proposal 2 / Proposal 2-1 / Proposal 2-2 / Proposal 2-3). As an example, when the UE is a non-coherent UE, the codebook subset to be applied / used for the UL transmission of the corresponding UE may be configured / determined / indicated based on the above-mentioned Proposal 1 / Proposal 1-1. As an example, when the UE is a partially coherent UE, the codebook subset to be applied / used for the UL transmission of the corresponding UE may be configured / determined / indicated based on the above-mentioned Proposal 2 / Proposal 2-1 / Proposal 2-2 / Proposal 2-3.

[0814] For example, the BS ( Fig.26 100 / 200) to UE( Figure 26 to Figure 29 The operation of sending UL scheduling information / precoding related information can be performed as follows Figure 26 to Figure 29 For example, refer to Fig.26 , one or more processors 102 may control one or more transceivers 106 and / or one or more memories 104 to send UL scheduling information / precoding related information, and one or more transceivers 106 may send UL scheduling information / precoding related information to the UE.

[0815] The BS may receive a UL channel / signal sent based on UL scheduling information / precoding related information from the UE (S130). As an example, the BS may receive data to which precoding is applied and an RS (e.g., DMRS) for data decoding from the UE. For example, the transmission of the UL channel / signal may be based on the above-mentioned method (e.g., Proposal 1 / Proposal 1-1 / Proposal 2 / Proposal 2-1 / Proposal 2-2 / Proposal 2-3). As an example, the transmission of the UL channel / signal may correspond to full-power UL transmission based on the above-mentioned method (e.g., Proposal 1 / Proposal 1-1 / Proposal 2 / Proposal 2-1 / Proposal 2-2 / Proposal 2-3).

[0816] For example, the BS in step S130 (eg, Fig.26 100 / 200) from UE( Figure 26 to Figure 29 The operation of receiving the UL channel / signal of the reference numeral 100 / 200) can be performed as follows Figure 26 to Figure 29 For example, refer to Fig.26 , the one or more processors 102 may control the one or more transceivers 106 and / or the one or more memories 104 to receive a UL channel / signal, and the one or more transceivers 106 may receive a UL channel / signal from a UE.

[0817] UE Operation

[0818] The user equipment (UE) may send UE capability information to the base station (BS) (S105). For example, the UE capability information may include the number of supported antenna ports / coherent capability (e.g., nonCoherent, partialNonCoherent, fullCoherent) / full power transmission capability. When the UE capability information is predefined / agreed, the corresponding step may be omitted.

[0819] For example, the UE in step S105 (eg, Figure 26 to Figure 29 100 / 200) to BS( Fig.26 The operation of sending UE capability information can be performed as follows Figure 26 to Figure 29 For example, refer to Fig.26 , the one or more processors 102 may control the one or more transceivers 106 and / or the one or more memories 104 to send the UE capability information, and the one or more transceivers 106 may send the UE capability information from the UE.

[0820] The UE may receive system information (SI) and / or scheduling information and / or CSI-related configuration (the above-mentioned CSI report setting / CSI-RS resource setting) and / or PUSCH-Config (S110) from the BS through a higher layer (e.g., RRC or MAC CE). As an example, the information sent through the higher layer may be sent separately / independently.

[0821] For example, the UE ( Figure 26 to Figure 29 100 / 200) from BS( Fig.26 The operation of receiving system information (SI) and / or scheduling information and / or CSI related Config can be performed as follows Figure 26 to Figure 29 For example, refer to Fig.26 , one or more processors 102 may control one or more transceivers 106 and / or one or more memories 104 to send system information (SI) and / or scheduling information and / or CSI-related Config and / or PUSCH Config, and one or more transceivers 106 may receive system information (SI) and / or scheduling information and / or CSI-related Config and / or PUSCH Config from a BS.

[0822] The UE may receive an RS (eg, SSB, CSI-RS, TRS, PT-RS, etc.) transmitted from the BS to acquire information about a downlink channel state (ie, DL CSI acquisition) (S115). As an example, the corresponding step may be based on the above-mentioned CSI-related operation.

[0823] For example, the UE in step S115 (eg, Figure 26 to Figure 29 100 / 200) from BS( Fig.26 The operation of receiving DL CSI and obtaining the related RS can be performed as follows Figure 26 to Figure 29 For example, refer to Fig.26 , the one or more processors 102 may control the one or more transceivers 106 and / or the one or more memories 104 to receive the DL CSI acquisition-related RS, and the one or more transceivers 106 may receive the DL CSI acquisition-related RS to the UE.

[0824] The UE may send an RS (e.g., SRS, etc.) to the BS in order to obtain information about the uplink channel state (i.e., UL CSI acquisition). As an example, the corresponding step may be based on a CSI-related operation. As an example, the RS may be based on channel information calculated based on the DL CSI acquisition-related RS in the above step S115. In addition, the UE may send the channel information together with the RS.

[0825] For example, the UE in step S210 (eg, Figure 26 to Figure 29 100 / 200) to BS( Fig.26 The operation of sending UL CSI to obtain the related RS can be performed as follows Figure 26 to Figure 29 For example, refer to Fig.26 , the one or more processors 102 may control the one or more transceivers 106 and / or the one or more memories 104 to send the UL CSI acquisition-related RS, and the one or more transceivers 106 may send the UL CSI acquisition-related RS from the UE.

[0826] The UE may receive UL scheduling information / precoding related information from the BS (S125). As an example, the precoding related information may include information about SRI / TPMI / TRI / MCS. As an example, the UL scheduling information / precoding related information may be DCI format 0-1 or DCI format 0-0. For example, the UL scheduling information / precoding related information may be determined / configured / indicated based on the above-mentioned proposed method (e.g., Proposal 1 / Proposal 1-1 / Proposal 2 / Proposal 2-1 / Proposal 2-2 / Proposal 2-3). As an example, when the UE is a non-coherent UE, the codebook subset to be applied / used for the UL transmission of the corresponding UE may be configured / determined / indicated based on the above-mentioned Proposal 1 / Proposal 1-1. As an example, when the UE is a partially coherent UE, the codebook subset to be applied / used for the UL transmission of the corresponding UE may be configured / determined / indicated based on the above-mentioned Proposal 2 / Proposal 2-1 / Proposal 2-2 / Proposal 2-3.

[0827] For example, the UE ( Figure 26 to Figure 29 100 / 200) from BS( Fig.26 The operation of receiving UL scheduling information / precoding related information can be performed as follows Figure 26 to Figure 29 For example, refer to Fig.26 , one or more processors 102 may control one or more transceivers 106 and / or one or more memories 104 to receive UL scheduling information / precoding related information, and one or more transceivers 106 may receive UL scheduling information / precoding related information to the UE.

[0828] The UE may send a UL channel / signal sent based on the UL scheduling information / precoding related information to the BS (S130). As an example, the UE may send data to which precoding is applied and an RS (e.g., DMRS) for data decoding to the BS. For example, the transmission of the UL channel / signal may be based on the above-mentioned method (e.g., Proposal 1 / Proposal 1-1 / Proposal 2 / Proposal 2-1 / Proposal 2-2 / Proposal 2-3). As an example, the transmission of the UL channel / signal may correspond to full-power UL transmission based on the above-mentioned method (e.g., Proposal 1 / Proposal 1-1 / Proposal 2 / Proposal 2-1 / Proposal 2-2 / Proposal 2-3).

[0829] For example, the UE in step S130 (eg, Figure 26 to Figure 29 100 / 200) to BS( Fig.26 The operation of sending the UL channel / signal of the reference numeral 100 / 200) can be performed as follows Figure 26 to Figure 29 For example, refer to Fig.26 , the one or more processors 102 may control the one or more transceivers 106 and / or the one or more memories 104 to receive a UL channel / signal, and the one or more transceivers 106 may transmit a UL channel / signal from the UE.

[0830] As described above, the above BS / UE operations (eg, Proposal 1 / Proposal 1-1 / Proposal 2 / Proposal 2-1 / Proposal 2-2 / Proposal 2-3 / Fig.24 ) can be obtained by the following device ( Figure 26 to Figure 29 For example, the UE may correspond to a first wireless device, the BS may correspond to a second wireless device, and in some cases, the opposite situation may also be considered.

[0831] For example, the above BS / UE operations (eg, Proposal 1 / Proposal 1-1 / Proposal 2 / Proposal 2-1 / Proposal 2-2 / Proposal 2-3 / Fig.24 ) can be Figure 26 to Figure 29 One or more processors (eg, 102 and 202) of the UE process, and the BS / UE operates (eg, Proposal 1 / Proposal 1-1 / Proposal 2 / Proposal 2-1 / Proposal 2-2 / Proposal 2-3 / Fig.24 ) can be used to drive Figure 26 to Figure 29 Instructions / programs (eg, instructions and executable code) of at least one processor (eg, 102 and 202) are stored in a memory (eg, Fig.26 in one or more memories (e.g., 104 and 204)).

[0832] Example of a communication system to which the present disclosure is applied

[0833] Although not limited thereto, the various descriptions, functions, processes, proposals, methods and / or operational flowcharts of the present disclosure disclosed in this document may be applied to various fields (e.g., 5G) that require wireless communication / connection between devices.

[0834] Hereinafter, the communication system will be described in more detail with reference to the accompanying drawings. In the following drawings / descriptions, if not described differently, the same reference numerals will represent the same or corresponding hardware blocks, software blocks or functional blocks.

[0835] Fig.25 A communication system applied to the present disclosure is shown.

[0836] Reference Fig.25 , the communication system 1 applied to the present disclosure includes a wireless device, a BS, and a network. Here, the wireless device may refer to a device that performs communication using a wireless access technology (e.g., 5G new RAT (NR) or long term evolution (LTE)), and may be referred to as a communication / wireless / 5G device. Although not limited to this, the wireless device may include a robot 100a, a vehicle 100b-1 and 100b-2, an extended reality (XR) device 100c, a handheld device 100d, a home appliance 100e, an Internet of Things (IoT) device 100f, and an AI device / server 400. For example, a vehicle may include a vehicle 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 an unmanned aerial vehicle (UAV) (e.g., a drone). The XR device may include an augmented reality (AR) / virtual reality (VR) / mixed reality (MR) device, and may be implemented in the form of a head-mounted device (HMD), a head-up display (HUD) provided in a vehicle, a television, a smart phone, a computer, a wearable device, a home appliance device, a digital signage, a vehicle, a robot, and the like. Handheld devices may include smart phones, smart boards, wearable devices (e.g., smart watches, smart glasses), computers (e.g., notebooks, etc.), etc. Home appliance devices may include TVs, refrigerators, washing machines, etc. IoT devices may include sensors, smart meters, etc. For example, a BS and a network may even be implemented as a wireless device, and a specific wireless device 200a may operate an eNB / network node for another wireless device.

[0837] The wireless devices 100a to 100f may be connected to the network 300 through the BS 200. Artificial intelligence (AI) technology may be applied to the wireless devices 100a to 100f, and the wireless devices 100a to 100f may be connected to the AI ​​server 400 through the network 300. The network 300 may be configured using a 3G network, a 4G (e.g., LTE) network, or a 5G (e.g., NR) network. The wireless devices 100a to 100f may communicate with each other through the BS 200 / network 300, but may communicate directly with each other without passing through the BS / network (side link communication). For example, the vehicles 100b-1 and 100b-2 may perform direct communication (e.g., vehicle-to-vehicle (V2V) / vehicle-to-everything (V2X) communication). In addition, an IoT device (e.g., a sensor) may perform direct communication with other IoT devices (e.g., a sensor) or other wireless devices 100a to 100f.

[0838] Wireless communication / connection 150a, 150b, and 150c may be performed between wireless devices 100a to 100f and BS200, and between BS200 and BS200. Here, wireless communication / connection may be performed through various wireless access technologies (e.g., 5G NR) such as uplink / downlink communication 150a, sidelink communication 150b (or D2D communication), and inter-BS communication 150c (e.g., relay, integrated access backhaul (IAB)). The wireless device and BS / wireless device and BS and BS may send / receive radio signals to each other through wireless communication / connection 150a, 150b, and 150c. For example, wireless communication / connection 150a, 150b, and 150c may send / receive signals through various physical channels. To this end, based on various proposals of the present disclosure, at least some of various configuration information setting processes for sending / receiving radio signals, various signal processing processes (e.g., channel coding / decoding, modulation / demodulation, resource mapping / demapping, etc.), resource allocation processes, etc. may be performed.

[0839] Example of wireless device to which the present disclosure is applied

[0840] Fig.26 A wireless device applicable to the present disclosure is shown.

[0841] Reference Fig.26 , the first wireless device 100 and the second wireless device 200 may transmit / receive radio signals through various wireless access technologies (e.g., LTE and NR). Here, the first wireless device 100 and the second wireless device 200 may correspond to Fig.25 The wireless device 100x and the BS 200 and / or the wireless device 100x and the wireless device 100x.

[0842] The first wireless device 100 may include one or more processors 102 and one or more memories 104, and further include one or more transceivers 106 and / or one or more antennas 108. The processor 102 may control the memory 104 and / or the transceiver 106, and may be configured to implement the description, function, process, proposal, method and / or operation flow disclosed in the present disclosure. For example, the processor 102 may process the information in the memory 104 and generate the first information / signal, and then send the radio signal including the first information / signal through the transceiver 106. In addition, the processor 102 may receive the radio signal including the second information / signal through the transceiver 106, and then store the information obtained from the signal processing of the second information / signal in the memory 104. The memory 104 may be connected to the processor 102 and store various information related to the operation of the processor 102. For example, the memory 104 may store software codes including instructions for executing some or all processes controlled by the processor 102 or executing the description, function, process, proposal, method and / or operation flow chart disclosed in the present disclosure. Here, the processor 102 and the memory 104 may be part of a communication modem / circuit / chip designated to implement wireless communication technology (e.g., LTE and NR). The transceiver 106 may be connected to the processor 102 and may send and / or receive radio signals through one or more antennas 108. The transceiver 106 may include a transmitter and / or a receiver. The transceiver 106 may be used in combination with a radio frequency (RF) unit. In the present disclosure, a wireless device may refer to a communication modem / circuit / chip.

[0843] The second wireless device 200 may include one or more processors 202 and one or more memories 204, and further include one or more transceivers 206 and / or one or more antennas 208. The processor 202 may control the memory 204 and / or the transceiver 206, and may be configured to implement the description, function, process, proposal, method and / or operation flow disclosed in the present disclosure. For example, the processor 202 may process the information in the memory 204 and generate a third information / signal, and then transmit a radio signal including the third information / signal through the transceiver 206. In addition, the processor 202 may receive a radio signal including a fourth information / signal through the transceiver 206, and then store information obtained from the signal processing of the fourth information / signal in the memory 204. The memory 204 may be connected to the processor 202 and store various information related to the operation of the processor 202. For example, the memory 204 may store software codes including instructions for executing some or all processes controlled by the processor 202 or executing the description, function, process, proposal, method and / or operation flow chart disclosed in the present disclosure. Here, the processor 202 and the memory 204 may be part of a communication modem / circuit / chip designated to implement wireless communication technologies (e.g., LTE and NR). The transceiver 206 may be connected to the processor 202 and may send and / or receive radio signals through one or more antennas 208. The transceiver 206 may include a transmitter and / or a receiver, and the transceiver 206 may be mixed with an RF unit. In the present disclosure, a wireless device may mean a communication modem / circuit / chip.

[0844] Hereinafter, the hardware elements of the wireless devices 100 and 200 will be described in more detail. Although not limited thereto, one or more protocol layers may be implemented by one or more processors 102 and 202. For example, one or more processors 102 and 202 may implement one or more layers (e.g., functional layers such as PHY, MAC, RLC, PDCP, RRC, and SDAP). One or more processors 102 and 202 may generate one or more protocol data units (PDUs) and / or one or more service data units (SDUs) according to the descriptions, functions, processes, proposals, methods, and / or operational flowcharts disclosed in the present disclosure. One or more processors 102 and 202 may generate messages, control information, data, or information according to the descriptions, functions, processes, proposals, methods, and / or operational flowcharts disclosed in the present disclosure. One or more processors 102 and 202 may generate a signal (e.g., a baseband signal) including a PDU, SDU, message, control information, data, or information according to the functions, procedures, proposals, and / or methods disclosed in the present disclosure and provide the generated signal to one or more transceivers 106 and 206. One or more processors 102 and 202 may receive a signal (e.g., a baseband signal) from one or more transceivers 106 and 206 and obtain the PDU, SDU, message, control information, data, or information according to the descriptions, functions, procedures, proposals, methods, and / or operational flow charts disclosed in the present disclosure.

[0845] One or more processors 102 and 202 may be referred to as controllers, microcontrollers, microprocessors, or microcomputers. One or more processors 102 and 202 may be implemented by hardware, firmware, software, or a combination thereof. As an 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 102 and 202. The descriptions, functions, processes, proposals, and / or operational flowcharts disclosed in the present disclosure may be implemented using firmware or software, and the firmware or software may be implemented to include modules, processes, functions, and the like. Firmware or software configured to execute the descriptions, functions, processes, proposals, and / or operational flowcharts disclosed in the present disclosure may be included in one or more processors 102 and 202 or stored in one or more memories 104 and 204, and driven by one or more processors 102 and 202. The descriptions, functions, processes, proposals and / or operational flow charts disclosed in this disclosure may be implemented using firmware or software in the form of codes, instructions and / or instruction sets.

[0846] One or more memories 104 and 204 may be connected to one or more processors 102 and 202 and may store various types of data, signals, messages, information, programs, codes, instructions and / or commands. One or more memories 104 and 204 may be configured by ROM, RAM, EPROM, flash memory, hard disk drive, register, cache memory, computer-readable storage medium and / or a combination thereof. One or more memories 104 and 204 may be located inside and / or outside one or more processors 102 and 202. In addition, one or more memories 104 and 204 may be connected to one or more processors 102 and 202 by various technologies such as wired or wireless connections.

[0847] One or more transceivers 106 and 206 may send user data, control information, wireless signals / channels, etc. mentioned in the method and / or operation flow chart of the present disclosure to one or more other devices. One or more transceivers 106 and 206 may receive user data, control information, wireless signals / channels, etc. mentioned in the description, function, process, proposal, method and / or operation flow chart disclosed in the present disclosure from one or more other devices. For example, one or more transceivers 106 and 206 may be connected to one or more processors 102 and 202 and send and receive radio signals. For example, one or more processors 102 and 202 may control one or more transceivers 106 and 206 to send user data, control information or radio signals to one or more other devices. In addition, one or more processors 102 and 202 may control one or more transceivers 106 and 206 to receive user data, control information or radio signals from one or more other devices. In addition, one or more transceivers 106 and 206 may be connected to one or more antennas 108 and 208, and one or more transceivers 106 and 206 may be configured to send and receive user data, control information, wireless signals / channels, etc. mentioned in the description, function, process, proposal, method and / or operation flow chart disclosed in the present disclosure through one or more antennas 108 and 208. In the present disclosure, one or more antennas may be multiple physical antennas or multiple logical antennas (e.g., antenna ports). One or more transceivers 106 and 206 may convert the received radio signal / channel from an RF band signal to a baseband signal so as to process the received user data, control information, radio signal / channel, etc. using one or more processors 102 and 202. One or more transceivers 106 and 206 may convert the user data, control information, radio signal / channel, etc. processed using one or more processors 102 and 202 from a baseband signal to an RF band signal. To this end, one or more of the transceivers 106 and 206 may include (analog) oscillators and / or filters.

[0848] Example of a signal processing circuit to which the present disclosure is applied

[0849] Fig. 27 A signal processing circuit for a transmission signal is shown.

[0850] Reference Fig. 27 , the signal processing circuit 1000 may include a scrambler 1010, a modulator 1020, a layer mapper 1030, a precoder 1040, a resource mapper 1050, and a signal generator 1060. Although not limited thereto, Fig. 27 The operation / function can be Fig.26 The processors 102 and 202 and / or the transceivers 106 and 206 are executed. Fig. 27 The hardware components can be found in Fig.26 102 and 202 and / or transceivers 106 and 206. For example, blocks 1010 to 1060 may be implemented in Fig.26 In addition, blocks 1010 to 1050 may be implemented in processors 102 and 202 of the present invention. Fig.26 1 and 202, and block 1060 may be implemented in Fig.26 is implemented in the transceivers 106 and 206.

[0851] Codewords can be passed Fig. 27 The signal processing circuit 1000 is transformed into a radio signal. Here, the codeword is a coded bit sequence of an information block. The information block may include a transport block (e.g., a UL-SCH transport block and a DL-SCH transport block). The radio signal may be transmitted through various physical channels (e.g., PUSCH and PDSCH).

[0852] Specifically, the codeword may be transformed into a bit sequence scrambled by the scrambler 1010. The scrambling sequence for scrambling may be generated based on an initialization value, and the initialization value may include the ID information of the wireless device. The scrambled bit sequence may be modulated into a modulation symbol sequence by the modulator 1020. 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), etc. The complex modulation symbol sequence may be mapped to one or more transmission layers by the layer mapper 1030. The modulation symbols of each transmission layer may be mapped to the corresponding antenna port (precoding) by the precoder 1040. The output z of the precoder 1040 may be obtained by multiplying the output y of the layer mapper 1030 by the precoding matrix W of N*M. Here, N represents the number of antenna ports and M represents the number of transmission layers. Here, the precoder 1040 may perform precoding after performing transform precoding (e.g., DFT transform) on the complex modulation symbol. In addition, the precoder 1040 may perform precoding without performing transform precoding.

[0853] The resource mapper 1050 may map the modulation symbols of each antenna port to a time-frequency resource. The time-frequency resource may include a plurality of symbols (e.g., CP-OFDMA symbols and DFT-s-OFDMA symbols) in the time domain and a plurality of subcarriers in the frequency domain. The signal generator 1060 may generate a radio signal from the mapped modulation symbols, and the generated radio signal may be sent to another device through each antenna. To this end, the signal generator 1060 may include an inverse fast Fourier transform (IFFT) module, a cyclic prefix (CP) inserter, a digital-to-analog converter (DAC), a frequency uplink converter, etc.

[0854] The signal processing process of the received signal in the wireless device can be Fig. 27 The signal processing processes (1010 to 1060) of the wireless device are configured in reverse. Fig.26 100 or 200) can receive a radio signal from the outside through an antenna port / transceiver. The received radio signal can be converted into a baseband signal by a signal reconstructor. To this end, the signal reconstructor may include a frequency downlink converter, an analog-to-digital converter (ADC), a CP remover, and a fast Fourier transform (FFT) module. Thereafter, the baseband signal can be reconstructed into a codeword through a resource demapper process, a post-coding process, a demodulation process, and a descrambling process. The codeword can be reconstructed into an original information block via decoding. Therefore, a signal processing circuit (not shown) receiving a signal may include a signal reconstructor, a resource demapper, a post-encoder, a demodulator, a descrambler, and a decoder.

[0855] Utilization example of wireless device to which the present disclosure is applied

[0856] Fig.28 Another example of a wireless device applied to the present disclosure is shown. The wireless device can be implemented in various types according to the use example / service (see Fig.25 ).

[0857] Reference Fig.28 , the wireless devices 100 and 200 may correspond to Fig.26 The wireless devices 100 and 200 may be composed of various elements, components, units and / or modules. For example, the wireless devices 100 and 200 may include a communication unit 110, a control unit 120, a memory unit 130, and an additional element 140. The communication unit may include a communication circuit 112 and a transceiver 114. For example, the communication circuit 112 may include Fig.26 One or more processors 102 and 202 and / or one or more memories 104 and 204. For example, the transceiver 114 may include Fig.26The control unit 120 is electrically connected to the communication unit 110, the memory unit 130, and the additional element 140, and controls the overall operation of the wireless device. For example, the control unit 120 may control the electrical / mechanical operation of the wireless device based on the program / code / instruction / information stored in the memory unit 130. In addition, the control unit 120 may transmit the information stored in the memory unit 130 to the outside (e.g., other communication devices) through the communication unit 110 via a wireless / wired interface, or store information received from the outside (e.g., other communication devices) through the communication unit 110 via a wireless / wired interface.

[0858] The additional element 140 may be configured differently depending on the type of the wireless device. For example, the additional element 140 may include at least one of a power supply unit / battery, an input / output (I / O) unit, a driving unit, and a computing unit. Although not limited thereto, the wireless device may be implemented as a Fig.25 The robot 100a, Fig.25 The vehicles 100b-1 and 100b-2, Fig.25 XR device 100c, Fig.25 The portable device 100d, Fig.25 Home appliances 100e, Fig.25 IoT device 100f, digital broadcast terminal, holographic device, public safety device, MTC device, medical device, fintech device (or financial device), security device, climate / environmental device, Fig.25 AI server / device 400, Fig.25 The wireless device may be in the form of a BS 200, a network node, etc. Depending on the use case / service, the wireless device may be mobile or may be used in a fixed location.

[0859] exist Fig.28In the wireless devices 100 and 200, various elements, components, units and / or modules in the wireless devices 100 and 200 may all be interconnected through a wired interface, or at least may be wirelessly connected through the communication unit 110. For example, the control unit 120 and the communication 110 in the wireless devices 100 and 200 may be wired, and the control unit 120 and the first unit (e.g., 130 or 140) may be wirelessly connected through the communication unit 110. In addition, the various elements, components, units and / or modules in the wireless devices 100 and 200 may also include one or more elements. For example, the control unit 120 may be composed of one or more processor sets. For example, the control unit 120 may be configured by a collection of a communication control processor, an application processor, an electronic control unit (ECU), a graphics processing processor, a memory control processor, etc. As another example, the memory (memory unit) 130 may be configured as a random access memory (RAM), a dynamic RAM (DRAM), a read-only memory (ROM), a flash memory, a volatile memory, a non-volatile memory and / or a combination thereof.

[0860] Hereinafter, the present invention will be described in more detail with reference to the accompanying drawings. Fig.28 An implementation example of .

[0861] Examples of AI devices to which the present disclosure is applied

[0862] Fig.29 AI devices applied to the present disclosure are exemplified. The AI ​​devices may be implemented as fixed devices or mobile devices, such as TVs, projectors, smart phones, PCs, notebooks, digital broadcast terminals, tablet PCs, wearable devices, set-top boxes (STBs), radios, washing machines, refrigerators, digital signage, robots, and vehicles.

[0863] Reference Fig.29 , the AI ​​device 100 may include a communication unit 110, a controller (controller unit) 120, a memory unit 130, an input / output unit 140a / 140b, a learning processor unit 140c, and a sensor unit 140d. Blocks 110-130 / 140a-140d correspond to blocks 110-130 / 140 of FIG. X3, respectively.

[0864] The communication unit 110 can communicate with / from other AI devices (e.g., Fig.25 100x, 200, and 400 in ) or AI servers (e.g. Fig.25 To this end, the communication unit 110 may transmit information in the memory unit 130 to the external device, or may transmit a signal received from the external device to the memory unit 130.

[0865] The controller 120 may determine at least one executable operation of the AI ​​device 100 based on information determined or created using a data analysis algorithm or a machine learning algorithm. In addition, the controller 120 may perform an operation determined by a component of the AI ​​device 100. For example, the controller 120 may request, search, receive, or use data from the learning processor unit 140c or the memory unit 130, and may control the components of the AI ​​device 100 to perform a predicted operation or an operation determined to be preferred among at least one executable operation. In addition, the controller 120 may collect historical information including feedback from the user on the operation content or operation of the AI ​​device 100 and store it in the memory unit 130 or the learning processor unit 140c, or may send the historical information to a server such as an AI server ( Fig.25 The collected historical information can be used to update the learning model.

[0866] The memory unit 130 may store data supporting various functions of the AI ​​device 100. For example, the memory unit 130 may store data obtained from the input unit 140a, data obtained from the communication unit 110, output data of the learning processor unit 140c, and data obtained from the sensing unit 140. In addition, the memory 130 may store control information and / or software codes for operation / execution of the controller 120.

[0867] The input unit 140a may obtain various types of data from the outside of the AI ​​device (100). For example, the input unit 140a may obtain learning data for model learning, input data for applying a learning model, etc. The input unit 140a may include a camera, a microphone, and / or a user input unit. The output unit 140b may generate outputs related to vision, hearing, touch, etc. The output unit 140b may include a display unit, a speaker, and / or a tactile module. The sensing unit 140 may obtain at least one of the internal information of the AI ​​device 100, the surrounding environment information of the AI ​​device 100, and the user information. The sensing unit 140 may include a proximity sensor, an illumination sensor, an acceleration sensor, a magnetic sensor, a gyroscope sensor, an inertial sensor, an RGB sensor, an IR sensor, a fingerprint recognition sensor, an ultrasonic sensor, a light sensor, a microphone, and / or a radar.

[0868] The learning processor unit 140c may use the learning data to train the model 151a configured as an artificial neural network. The learning processor unit 140c may communicate with the AI ​​server ( Fig.25The learning processor unit 140c may perform AI processing together with the learning processor unit 400 of FIG. 400. The learning processor unit 140c may process information received from an external device through the communication unit 110 and / or information stored in the memory unit 130. In addition, the output value of the learning processor unit 140c may be transmitted to an external device through the communication unit and / or may be stored in the memory unit 130.

[0869] Here, in addition to LTE, NR and 6G, the wireless communication technology implemented in the wireless devices 100 and 200 of the present disclosure may include a narrowband Internet of Things for low-power communication. In this case, for example, the NB-IoT technology may be an example of a low-power wide area network (LPWAN) technology, and may be implemented as a standard such as LTE Cat NB1 and / or LTE Cat NB2, without being limited to the above names. Additionally or alternatively, the wireless communication technology implemented in the wireless devices 100 and 200 of the present disclosure may perform communication based on the LTE-M technology. In this case, as an example, the LTE-M technology may be an example of an LPWAN, and may be referred to as various names including enhanced machine type communication (eMTC) and the like. For example, the LTE-M technology may be implemented as at least any one of various standards such as 1) LTE CAT0, 2) LTE Cat M1, 3) LTE Cat M2, 4) LTE non-bandwidth limited (non-BL), 5) LTE-MTC, 6) LTE machine type communication and / or 7) LTE M. Additionally or alternatively, the wireless communication technology implemented in the wireless devices 100 and 200 of the present disclosure may consider low power communication including at least one of ZigBee, Bluetooth, and a low power wide area network (LPWAN), and is not limited to the above names. As an example, the ZigBee technology may generate a personal area network (PAN) associated with small / low power digital communication based on various standards including IEEE 802.15.4, etc., and may be referred to as various names.

[0870] It is obvious to those skilled in the art that the present disclosure can be specifically implemented in other specific forms without departing from the basic characteristics of the present disclosure. Therefore, the above detailed description should not be interpreted as limiting in all aspects, but should be considered as illustrative. The scope of the present disclosure should be determined by the reasonable interpretation of the attached claims, and all modifications within the equivalent scope of the present disclosure are included in the scope of the present disclosure.

[0871] The above-mentioned embodiments are realized by the combination of the structural elements and features of the present invention in a predetermined manner. Unless specified separately, each structural element or feature should be considered selectively. Each structural element or feature can be implemented without being combined with other structural elements or features. In addition, some structural elements and / or features can be combined with each other to form an embodiment of the present invention. The order of operations described in the embodiment of the present invention can be changed. Some structural elements or features of an embodiment can be included in another embodiment, or can be replaced by corresponding structural elements or features of another embodiment. In addition, it is obvious that some claims citing specific claims can be combined with another claim of other claims other than citing specific claims to form an embodiment, or new claims can be added by amendment after submitting an application.

[0872] Embodiments of the present invention can be implemented by various means such as hardware, firmware, software or a combination thereof. In hardware configuration, the method according to the embodiment of the present invention can be implemented by one or more ASICs (application specific integrated circuits), DSPs (digital signal processors), DSPDs (digital signal processing devices), PLDs (programmable logic devices), FPGAs (field programmable gate arrays), processors, controllers, microcontrollers, microprocessors, etc.

[0873] In firmware or software configuration, the embodiments of the present invention may be implemented in the form of modules, procedures, functions, etc. The software code may be stored in a memory and executed by a processor. The memory may be located inside or outside the processor and may send and receive data to and from the processor via various known means.

[0874] It will be apparent to those skilled in the art that various modifications and variations may be made to the present invention without departing from the spirit or scope of the present invention. Therefore, the present invention is intended to cover modifications and variations of the present invention as long as they fall within the scope of the appended claims and their equivalents.

[0875] Industrial Applicability

[0876] The method of transmitting uplink data with high reliability in the wireless communication system of the present disclosure is described based on an example in which the method is applied to a 3GPP NR system, but can be applied to various wireless communication systems other than the 3GPP NR system.

Claims

1. A method for transmitting an uplink signal by a user equipment UE based on a codebook in a wireless communication system, the method comprising the following steps: Receiving, from a base station, downlink control information DCI for determining a precoding matrix applied to transmission of the uplink signal, wherein the format of the DCI is 0_1 and includes a "precoding information and number of layers" field whose size is configured based on a higher layer parameter and the number of antenna ports used by the UE for transmission of the uplink signal, wherein the higher layer parameter includes a "codebook subset" parameter configured from the base station to the UE, wherein the value of the "precoding information and number of layers" field is mapped to an index of a transmit precoding matrix indicator TPMI based on a value of the "codebook subset" parameter for indicating the precoding matrix; determining a precoding matrix applied to transmission of the uplink signal based on the DCI, wherein the precoding matrix is ​​determined from a subset of the codebook related to transmission of the uplink signal; and sending the uplink signal to the base station based on the determined precoding matrix, wherein, based on a codebook subset being set as nonCoherent, the subset of the codebook includes at least one precoding matrix including at least one specific precoding matrix for full power transmission, The codebook includes (i) a first codebook associated with rank 1 using four antenna ports, (ii) a second codebook associated with rank 2 using four antenna ports, (iii) a third codebook associated with rank 3 using four antenna ports, and (iv) a fourth codebook associated with rank 4 using four antenna ports, The first codebook is based on one of [Table 1] or [Table 2]. When the configuration of the high-level parameters of the transform precoder is set to "enabled", the first codebook is based on [Table 1]. When the configuration of the high-level parameters of the transform precoder is set to "disabled", the first codebook is based on [Table 2]. [Table 1] [Table 2] The second codebook is based on [Table 3], [Table 3] Wherein, the third codebook is based on [Table 4], and [Table 4] The fourth codebook is based on [Table 5], [Table 5] The at least one specific precoding matrix is ​​related to rank 1 uplink transmission, rank 2 uplink transmission, rank 3 uplink transmission, and rank 4 uplink transmission using four antenna ports, wherein (i) the TPMI index of the first at least one precoding matrix for the rank-1 uplink transmission of the four antenna ports included in the at least one precoding matrix of the subset of the codebook consists of 0 to 3 and 13, and (ii) the TPMI index of the first precoding matrix for the rank-1 uplink transmission of the four antenna ports included in the at least one specific precoding matrix for the full-power transmission is 13, wherein (i) the TPMI index of the second at least one precoding matrix for the rank-2 uplink transmission of the four antenna ports included in the at least one precoding matrix of the subset of the codebook consists of 0 to 6, and (ii) the TPMI index of the second precoding matrix for the rank-2 uplink transmission of the four antenna ports included in the at least one specific precoding matrix for the full power transmission is 6, wherein (i) the TPMI index of the third at least one precoding matrix for the rank-3 uplink transmission of the four antenna ports included in the at least one precoding matrix of the subset using the codebook consists of 0 and 1, and (ii) the TPMI index of the third precoding matrix for the rank-3 uplink transmission of the four antenna ports included in the at least one specific precoding matrix for the full-power transmission is 1, and The TPMI index of the fourth at least one precoding matrix for the rank-4 uplink transmission of the four antenna ports included in the at least one precoding matrix of the subset of the codebook consists of 0.

2. The method according to claim 1, wherein: The UE capability related to coherence is the nonCoherent, and The nonCoherent UE capability is a difference change between phase values ​​applied to antenna ports for transmitting the uplink signal in all antenna port pairs.

3. The method according to claim 2, wherein: Based on the determined precoding matrix being one of the at least one specific precoding matrix, transmitting the uplink signal based on the full power transmission, and Wherein, based on the determined precoding matrix being one of the at least one specific precoding matrix, the uplink signal is transmitted through all the antenna ports used for transmitting the uplink signal.

4. The method according to claim 3, further comprising the steps of: determining an uplink transmission power for uplink transmission based on the DCI, The DCI further includes information on an optimal power level for the uplink transmission, and the determined uplink transmission power is divided into the same value across all antenna ports used to transmit the uplink signal and applied.

5. The method according to claim 3, wherein: The subset of the codebooks is configured based on a precoding matrix included in each of the first to fourth codebooks.

6. A user equipment UE configured to send an uplink signal based on a codebook in a wireless communication system, the UE comprising: Transmitter; Receiver; as well as a processor functionally connected to the transmitter and the receiver, Wherein, the processor is configured to: controlling the receiver to receive downlink control information DCI for determining a precoding matrix applied to uplink signal transmission from a base station, wherein the format of the DCI is 0_1 and includes a "precoding information and number of layers" field whose size is configured based on a high-level parameter and the number of antenna ports used by the UE for transmission of the uplink signal, wherein the high-level parameter includes a "codebook subset" parameter configured from the base station to the UE, wherein the value of the "precoding information and number of layers" field is mapped to an index of a transmit precoding matrix indicator TPMI based on the value of the "codebook subset" parameter used to indicate the precoding matrix, and determining a precoding matrix applied to transmission of the uplink signal based on the DCI, wherein the precoding matrix is ​​determined from a subset of the codebook related to transmission of the uplink signal; and controlling the transmitter to send the uplink signal to the base station based on the determined precoding matrix, wherein, based on a codebook subset being set as nonCoherent, the subset of the codebook includes at least one precoding matrix including at least one specific precoding matrix for full power transmission, The codebook includes (i) a first codebook associated with rank 1 using four antenna ports, (ii) a second codebook associated with rank 2 using four antenna ports, (iii) a third codebook associated with rank 3 using four antenna ports, and (iv) a fourth codebook associated with rank 4 using four antenna ports, The first codebook is based on one of [Table 1] or [Table 2]. When the configuration of the high-level parameters of the transform precoder is set to "enabled", the first codebook is based on [Table 1]. When the configuration of the high-level parameters of the transform precoder is set to "disabled", the first codebook is based on [Table 2]. [Table 1] [Table 2] The second codebook is based on [Table 3], [Table 3] Wherein, the third codebook is based on [Table 4], and [Table 4] The fourth codebook is based on [Table 5], [Table 5] The at least one specific precoding matrix is ​​related to rank 1 uplink transmission, rank 2 uplink transmission, rank 3 uplink transmission, and rank 4 uplink transmission using four antenna ports, wherein (i) the TPMI index of the first at least one precoding matrix for the rank-1 uplink transmission of the four antenna ports included in the at least one precoding matrix of the subset of the codebook consists of 0 to 3 and 13, and (ii) the TPMI index of the first precoding matrix for the rank-1 uplink transmission of the four antenna ports included in the at least one specific precoding matrix for the full-power transmission is 13, wherein (i) the TPMI index of the second at least one precoding matrix for the rank-2 uplink transmission of the four antenna ports included in the at least one precoding matrix of the subset of the codebook consists of 0 to 6, and (ii) the TPMI index of the second precoding matrix for the rank-2 uplink transmission of the four antenna ports included in the at least one specific precoding matrix for the full power transmission is 6, wherein (i) the TPMI index of the third at least one precoding matrix for the rank-3 uplink transmission of the four antenna ports included in the at least one precoding matrix of the subset using the codebook consists of 0 and 1, and (ii) the TPMI index of the third precoding matrix for the rank-3 uplink transmission of the four antenna ports included in the at least one specific precoding matrix for the full-power transmission is 1, and The TPMI index of the fourth at least one precoding matrix for the rank-4 uplink transmission of the four antenna ports included in the at least one precoding matrix of the subset of the codebook consists of 0.

7. A method for receiving an uplink signal based on a codebook by a base station in a wireless communication system, the method comprising the following steps: Sending downlink control information DCI for determining a precoding matrix applied to uplink signal transmission to a user equipment UE, wherein the format of the DCI is 0_1 and includes a "precoding information and number of layers" field whose size is configured based on a high-level parameter and the number of antenna ports used by the UE for transmission of the uplink signal, wherein the high-level parameter includes a "codebook subset" parameter configured from the base station to the UE, wherein the value of the "precoding information and number of layers" field is mapped to an index of a transmit precoding matrix indicator TPMI based on the value of the "codebook subset" parameter used to indicate the precoding matrix; and receiving the uplink signal from the UE according to the precoding matrix determined based on the DCI, wherein the precoding matrix is ​​from a subset of the codebook related to transmission of the uplink signal, wherein, based on a codebook subset being set as nonCoherent, the subset of the codebook includes at least one precoding matrix including at least one specific precoding matrix for full power transmission, The codebook includes (i) a first codebook associated with rank 1 using four antenna ports, (ii) a second codebook associated with rank 2 using four antenna ports, (iii) a third codebook associated with rank 3 using four antenna ports, and (iv) a fourth codebook associated with rank 4 using four antenna ports, The first codebook is based on one of [Table 1] or [Table 2]. When the configuration of the high-level parameters of the transform precoder is set to "enabled", the first codebook is based on [Table 1]. When the configuration of the high-level parameters of the transform precoder is set to "disabled", the first codebook is based on [Table 2]. [Table 1] [Table 2] The second codebook is based on [Table 3], [Table 3] Wherein, the third codebook is based on [Table 4], and [Table 4] The fourth codebook is based on [Table 5], [Table 5] The at least one specific precoding matrix is ​​related to rank 1 uplink transmission, rank 2 uplink transmission, rank 3 uplink transmission, and rank 4 uplink transmission using four antenna ports, wherein (i) the TPMI index of the first at least one precoding matrix for the rank-1 uplink transmission of the four antenna ports included in the at least one precoding matrix of the subset of the codebook consists of 0 to 3 and 13, and (ii) the TPMI index of the first precoding matrix for the rank-1 uplink transmission of the four antenna ports included in the at least one specific precoding matrix for the full-power transmission is 13, wherein (i) the TPMI index of the second at least one precoding matrix for the rank-2 uplink transmission of the four antenna ports included in the at least one precoding matrix of the subset of the codebook consists of 0 to 6, and (ii) the TPMI index of the second precoding matrix for the rank-2 uplink transmission of the four antenna ports included in the at least one specific precoding matrix for the full power transmission is 6, wherein (i) the TPMI index of the third at least one precoding matrix for the rank-3 uplink transmission of the four antenna ports included in the at least one precoding matrix of the subset using the codebook consists of 0 and 1, and (ii) the TPMI index of the third precoding matrix for the rank-3 uplink transmission of the four antenna ports included in the at least one specific precoding matrix for the full-power transmission is 1, and The TPMI index of the fourth at least one precoding matrix for the rank-4 uplink transmission of the four antenna ports included in the at least one precoding matrix of the subset of the codebook consists of 0.

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