Method and apparatus for controlling UE transmit power in a wireless communication system

Abstract

The present disclosure relates to a communication method and system for integrating a fifth-generation (5G) communication system supporting higher data rates than the fourth-generation (4G) system with Internet of Things (IoT) technology. The present disclosure can be applied to smart services based on 5G communication technology and IoT-related technologies, such as smart homes, smart buildings, smart cities, smart cars, connected vehicles, healthcare, digital education, smart retail, and safety and security services.

Description

Technical Field

[0001] The present disclosure relates to a method for controlling the transmit power of a user equipment (UE) in a wireless communication system. More specifically, the present disclosure relates to a method and apparatus for setting the transmit power when the UE (terminal) transmits a sidelink control channel and a sidelink data channel. Background Art

[0002] In order to meet the increasing demand for wireless data traffic since the deployment of the fourth generation (4G) communication system, efforts have been made to develop improved fifth generation (5G) or pre-5G communication systems. Therefore, 5G or pre-5G communication systems are also referred to as "beyond 4G networks" or "post-long term evolution (LTE) systems." 5G communication systems are considered to be implemented in higher frequency (millimeter (mm) wave) bands (e.g., 60 gigahertz (GHz) bands) to achieve higher data rates. In order to reduce the propagation loss of radio waves and increase the transmission distance, beamforming, massive multiple input multiple output (MIMO), full-dimensional multiple input multiple output (FD-MIMO), array antennas, analog beamforming, and massive antenna technology are being discussed in 5G communication systems. In addition, in 5G communication systems, system network improvements are being developed based on advanced small cells, cloud radio access networks (RANs), ultra-dense networks, device-to-device (D2D) communications, wireless backhaul, mobile networks, cooperative communications, coordinated multipoint (CoMP), receiver-side interference cancellation, etc. In 5G systems, hybrid frequency shift keying (FSK) and quadrature amplitude modulation (QAM) (FQAM) and sliding window superposition coding (SWSC) have been developed as advanced coding modulation (ACM), and filter bank multi-carrier (FBMC), non-orthogonal multiple access (NOMA) and sparse code multiple access (SCMA) as advanced access technologies.

[0003] The Internet, a human-centric network of connected devices where humans generate and consume information, is now evolving into the Internet of Things (IoT), in which distributed entities (such as things) exchange and process information without human intervention. The Internet of Everything (IoE) has emerged, combining IoT technologies with big data processing technologies connected to cloud servers. Because IoT implementation requires technical elements such as sensing technology, wired / wireless communication and network infrastructure, service interface technology, and security technology, sensor networks, machine-to-machine (M2M) communication, and machine-type communication (MTC) have recently been studied. This IoT environment can provide intelligent Internet technology services, creating new value for human life by collecting and analyzing data generated by connected things. By integrating and combining existing information technology (IT) with various industrial applications, the IoT can be applied in a variety of fields, including smart homes, smart buildings, smart cities, smart cars (connected vehicles), smart grids, healthcare, smart appliances, and advanced medical services.

[0004] In line with this, various attempts have been made to apply 5G communication systems to IoT networks. For example, technologies such as sensor networks, machine-type communications (MTC), and machine-to-machine (M2M) communications can be implemented through beamforming, MIMO, and array antennas. Cloud radio access networks (RANs), as an application of the aforementioned big data processing technologies, can also be considered an example of the convergence of 5G and IoT technologies.

[0005] According to the above and the development of mobile communication systems, various services can be provided, and thus a plan for efficiently providing these services is required.

[0006] The above information is provided as background information only to assist in understanding the present disclosure. No determination has been made, and no assertion is made, as to whether any of the above items may be applied as prior art with respect to the present disclosure. Summary of the Invention

[0007] Technical issues

[0008] The present disclosure relates to a method for controlling the transmit power of a sidelink control channel and a sidelink data channel.

[0009] Solution to the problem

[0010] In one aspect of the present disclosure, a method performed by a first user equipment (UE) in a wireless communication system is provided. The method includes receiving a radio resource control (RRC) message including information related to a sidelink transmit power from a base station, determining the sidelink transmit power based on the information, and transmitting a sidelink control channel and a sidelink data channel based on the determined sidelink transmit power, wherein the information includes at least one of downlink path loss related information or sidelink path loss related information.

[0011] In another aspect of the present disclosure, a method performed by a base station in a wireless communication system is provided. The method includes sending an RRC message including information related to sidelink transmit power to a first UE, and receiving a sidelink control channel and a sidelink data channel based on the sidelink transmit power from the first UE, wherein the sidelink transmit power is determined based on the information, and wherein the information includes at least one of downlink path loss related information or sidelink path loss related information.

[0012] In another aspect of the present disclosure, a first UE is provided. The first UE includes a transceiver configured to transmit or receive at least one signal, and at least one processor coupled to the transceiver. The at least one processor is configured to receive an RRC message including information related to sidelink transmit power from a base station, determine the sidelink transmit power based on the information, and transmit a sidelink control channel and a sidelink data channel based on the determined sidelink transmit power, wherein the information includes at least one of downlink path loss related information or sidelink path loss related information.

[0013] In another aspect of the present disclosure, a base station is provided. The base station includes a transceiver configured to transmit or receive at least one signal, and at least one processor coupled to the transceiver. The at least one processor is configured to transmit an RRC message including information related to sidelink transmit power to a first UE, and receive a sidelink control channel and a sidelink data channel based on the sidelink transmit power from the first UE, wherein the sidelink transmit power is determined based on the information, and wherein the information includes at least one of downlink path loss related information or sidelink path loss related information.

[0014] Additional aspects will be set forth in part in the description which follows and, in part, will be obvious from the description, or may be learned by practice of the presented embodiments.

[0015] According to this technology, the transmission power of the sidelink control channel and the sidelink data channel can be effectively controlled.

[0016] Other aspects, advantages, and salient features of the disclosure will become apparent to those skilled in the art from the following detailed description, which, taken in conjunction with the annexed drawings, discloses various embodiments of the disclosure.

[0017] Advantageous Effects of the Invention

[0018] Aspects of the present disclosure are to address at least the above-mentioned problems and / or disadvantages and to provide at least the advantages described below. Therefore, one aspect of the present disclosure is to provide a method for controlling transmit power of a sidelink control channel and a sidelink data channel. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] The above and other aspects, features and advantages of certain embodiments of the present disclosure will become more apparent from the following description taken in conjunction with the accompanying drawings, in which:

[0020] Figure 1A A system according to an embodiment of the present disclosure is shown;

[0021] Figure 1B A system according to an embodiment of the present disclosure is shown;

[0022] Figure 1C shows a system according to an embodiment of the present disclosure; and

[0023] Figure 1D A system according to an embodiment of the present disclosure is shown;

[0024] Figure 2A A vehicle-to-everything (V2X) communication method performed via a side link according to an embodiment of the present disclosure is shown; and

[0025] Figure 2B A V2X communication method performed via a side link according to an embodiment of the present disclosure is shown;

[0026] Figure 3 FIG4 illustrates V2X transmit power control according to an embodiment of the present disclosure;

[0027] Figure 4 FIG4 illustrates the interference caused by a frequency block transmitted by a V2X UE in an adjacent frequency block according to an embodiment of the present disclosure;

[0028] Figure 5 FIG4 illustrates the interference caused by a frequency block transmitted by a V2X UE in an adjacent frequency block according to an embodiment of the present disclosure;

[0029] Figure 6 FIG4 illustrates V2X transmit power control according to an embodiment of the present disclosure;

[0030] Figure 7 is a diagram illustrating side link resources for performing V2X communication according to an embodiment of the present disclosure;

[0031] Figure 8 A method for multiplexing a sidelink control channel and a sidelink data channel within a sidelink resource according to an embodiment of the present disclosure is shown;

[0032] Figure 9 A method for multiplexing a sidelink control channel and a sidelink data channel within a sidelink resource according to an embodiment of the present disclosure is shown;

[0033] Figure 10 A method for multiplexing a sidelink control channel and a sidelink data channel within a sidelink resource according to an embodiment of the present disclosure is shown;

[0034] Figure 11 A method for multiplexing a sidelink control channel and a sidelink data channel within a sidelink resource according to an embodiment of the present disclosure is shown;

[0035] Figure 12 A method for multiplexing a sidelink control channel and a sidelink data channel within a sidelink resource according to an embodiment of the present disclosure is shown;

[0036] Figure 13 A method for multiplexing side link channels within a side link resource according to an embodiment of the present disclosure is shown;

[0037] Figure 14 An operation flow chart of a V2X UE for sidelink transmit power control according to an embodiment of the present disclosure is shown;

[0038] Figure 15 is a diagram showing a configuration of a UE according to an embodiment of the present disclosure; and

[0039] Figure 16 is a diagram showing a base station configuration according to an embodiment of the present disclosure.

[0040] Throughout the drawings, it should be noted that like reference numbers are used to depict the same or similar elements, features, and structures. DETAILED DESCRIPTION

[0041] The following description, with reference to the accompanying drawings, is provided to assist in a comprehensive understanding of the various embodiments of the present disclosure as defined by the claims and their equivalents. It includes various specific details to assist understanding, but these are to be considered merely as examples. Therefore, those skilled in the art will recognize that various changes and modifications may be made to the various embodiments described herein without departing from the scope and spirit of the present disclosure. In addition, descriptions of well-known functions and configurations may be omitted for the sake of clarity and conciseness.

[0042] The terms and words used in the following description and claims are not limited to the bibliographical meanings, but are merely used by the inventor to enable a clear and consistent understanding of the present disclosure. Therefore, it will be apparent to those skilled in the art that the following description of various embodiments of the present disclosure is provided for illustration purposes only and not for the purpose of limiting the present disclosure as defined by the appended claims and their equivalents.

[0043] It is to be understood that the singular forms "a," "an," and "the" include plural referents unless the context clearly dictates otherwise. Thus, for example, reference to "a component surface" includes reference to one or more of such surfaces.

[0044] When describing the embodiments, descriptions of technologies that are known in the technical field to which the present disclosure belongs and are not directly related to the present disclosure are omitted. Such unnecessary omissions are intended to prevent the main idea of ​​the present disclosure from being obscured and to convey the main idea more clearly.

[0045] For the same reason, in the accompanying drawings, some elements are enlarged, omitted or schematically shown. In addition, the size of each element does not fully reflect the actual size. In the accompanying drawings, the same or corresponding elements are represented by the same reference numerals.

[0046] The advantages and features of the present disclosure and methods for achieving them will become apparent by reference to the embodiments described in detail below in conjunction with the accompanying drawings. However, the present disclosure is not limited to the following embodiments and can be implemented in various forms. The embodiments of the present disclosure are provided to complete the present disclosure and fully inform those skilled in the art of the scope of the present disclosure, and the present disclosure is limited only by the scope of the claims. Throughout the specification, the same or similar reference numerals represent the same or similar elements.

[0047] Here, it will be understood that each block of the flowchart diagram and the combination of blocks in the flowchart diagram can be implemented by computer program instructions. These computer program instructions can be provided to a processor of a general-purpose computer, a special-purpose computer, or other programmable data processing device, so that the instructions executed by the processor of the computer or other programmable data processing device form a device for implementing the functions specified in one or more flowchart blocks. These computer program instructions can also be stored in a computer-usable or computer-readable memory, which can instruct the computer or other programmable data processing device to operate in a specific manner so that the instructions stored in the computer-usable or computer-readable memory produce an article including an instruction device, which implements the functions specified in one or more flowchart blocks. The computer program instructions can also be loaded onto a computer or other programmable data processing device to cause a series of operations to be performed on the computer or other programmable data processing device, thereby generating a computer-implemented process, so that the instructions executed on the computer or other programmable data processing device provide operations for implementing the functions specified in one or more flowchart blocks.

[0048] In addition, each block of the flowchart diagram may represent a module, code segment, or code portion, which includes one or more executable instructions for implementing a specified logical function. It should also be noted that in some alternative embodiments, the functions mentioned in the blocks may not occur in order. For example, depending on the functions involved, two blocks shown in succession may actually be executed substantially simultaneously, or the blocks may sometimes be executed in reverse order.

[0049] As used herein, "unit" refers to a software element or hardware element that performs a predetermined function, such as a field programmable gate array (FPGA) or an application specific integrated circuit (ASIC). However, "unit" does not always have the meaning of being limited to software or hardware. A "unit" can be constructed to be stored in an addressable storage medium or to execute one or more processors. Therefore, a "unit" includes, for example, software elements, object-oriented software elements, class elements or task elements, processes, functions, attributes, programs, subroutines, program code segments, drivers, firmware, microcodes, circuits, data, databases, data structures, tables, arrays, and parameters. The elements and functions provided by a "unit" can be combined into a smaller number of elements: "units" or divided into a larger number of elements: "units". In addition, elements and "units" can be implemented as one or more central processing units (CPUs) in a reproduction device or a secure multimedia card. In addition, in an embodiment, a "unit" can include one or more processors.

[0050] In the embodiments described in detail, the main objects are the radio access network (new RAN, NR) and the core network, that is, the packet core (5G system, 5G core network or next generation core (NG core)) in the 5G mobile communication standard specified by the mobile communication standardization organization (3GPP). However, the main idea of ​​the present disclosure is that the present disclosure can be applied to other communication systems with similar technical backgrounds with minor modifications without departing from the scope of the present disclosure, and the application can be made by those skilled in the art to which the present disclosure belongs.

[0051] In 5G systems, to support network automation, a network data collection and analysis function (NWDAF) can be defined. This is a network function that analyzes data collected in the 5G network and provides analyzed data. The NWDAF can collect information from the 5G network, store information in it, analyze it, and provide results to unspecified network functions (NFs). The analysis results can be used independently for each NF.

[0052] Hereinafter, for the convenience of description, some of the terms and names defined in the 3rd Generation Partnership Project Long Term Evolution (3GPP LTE) standards such as 5G, NR, LTE, or systems similar to these systems may be used. However, the present disclosure is not limited by the terms and names and can be equally applied to a system based on another standard.

[0053] In addition, the terms used below, such as terms for identifying access nodes, terms indicating network entities, terms indicating messages, terms indicating interfaces between network entities, and terms indicating various identification information, are shown for convenience of description. Therefore, the present disclosure is not limited to the following terms, and other terms with the same technical meaning may be used.

[0054] In order to meet the increased demand for wireless data traffic after the commercialization of the 4G communication system, efforts have been made to develop an improved 5G communication system (new radio, NR). In order to achieve high data transmission rates, the 5G communication system is designed to support millimeter wave bands (e.g., 28 GHz band). In the 5G communication system, technologies such as beamforming, massive MIMO, full-dimensional multiple-input multiple-output (FD-MIMO), array antennas, analog beamforming, and massive antennas are being discussed as a means of reducing propagation path losses in the millimeter wave band and increasing propagation transmission distances. Unlike LTE, the 5G communication system includes 15 kHz to support various subcarrier spacings such as 30 kHz, 60 kHz, and 120 kHz, the physical control channel uses polar coding, and the physical data channel uses low-density parity check (LDPC). In addition to discrete Fourier transform spread orthogonal frequency division multiplexing (DFT-S-OFDM), cyclic prefix (CP)-OFDM is used as the waveform for uplink transmission. LTE supports hybrid automatic repeat request (ARQ) (HARQ) retransmission based on transmission blocks (TBs), while 5G can also support HARQ retransmission based on code block groups (CBGs) composed of code blocks.

[0055] In addition, 5G communication systems have developed technologies such as evolved small cells, advanced small cells, cloud radio access networks (cloud RAN), ultra-dense networks, device-to-device (D2D) communications, wireless backhaul, vehicle-to-everything (V2X) networks, cooperative communications, coordinated multipoint (CoMP), and receive interference cancellation to improve system networks.

[0056] At the same time, the Internet has evolved from a human-driven connected network where humans generate and consume information to an Internet of Things (IoT) network where distributed elements such as objects exchange and process information. The Internet of Everything (IoE) has emerged, combining big data processing technologies with IoT technologies through connections to cloud servers and other platforms. Implementing the IoT requires technological factors such as sensing, wired and wireless communications, network infrastructure, service interface technologies, and security. Recently, research has been conducted on technologies for connecting objects, such as sensor networks, machine-to-machine (M2M) communications, and machine-type communications (MTC). In the IoT, by collecting and analyzing data generated by connected objects, intelligent Internet of Things (IT) services can be provided, creating new value for people's lives. Through the integration of related information technology (IT) technologies and various industries, the IoT can be applied to areas such as smart homes, smart buildings, smart cities, smart cars, connected vehicles, smart grids, healthcare, smart appliances, and high-tech medical services.

[0057] Therefore, various attempts have been made to apply 5G communication systems to IoT networks. For example, technologies such as sensor networks, machine-to-machine (M2M) communication, and machine type communication (MTC) have been implemented through 5G communication technologies such as beamforming, MIMO, and array antennas. Cloud RAN as an application of the above-mentioned big data processing technology may be an example of the fusion of 3eG technology and IoT technology. Therefore, a variety of services can be provided to users in a communication system, and in order to provide users with a variety of services, a method for providing each service according to characteristics within the same time period and an apparatus using the method are required. Various services provided in the 5G communication system have been studied, and one of the services is a service that meets requirements such as low latency and high reliability.

[0058] In the case of vehicle communications, based on the device-to-device (D2D) communication structure, the standardized operation of LTE-based V2X has been completed in 3GPP Rel-14 and Rel-15, and efforts are currently underway to develop 5G NR-based V2X. NR V2X will support unicast communication, groupcast (or multicast) communication, and broadcast communication between UEs. In addition, unlike LTE V2X, which aims to send or receive basic safety information required for vehicles to travel on the road, NR V2X aims to provide more advanced services such as vehicle platooning, advanced driving, extended sensors, and remote driving.

[0059] When an NR V2X UE is within the coverage of a base station, the NR V2X UE may receive parameter values ​​for controlling sidelink transmit power from the base station and control the sidelink transmit power based on these parameter values. Furthermore, when the NR V2X UE is outside the coverage of the base station, the NR V2X UE may control the sidelink transmit power using preset sidelink transmit power control parameter values. The sidelink transmit power control parameters may include P0 and α. In addition to the aforementioned P0 and α values, the NR V2X UE may also set a transmit power value based on the frequency block size of the sidelink control channel and data channel to be transmitted. That is, the transmit power value may increase when the frequency block size of the sidelink control channel and data channel to be transmitted increases, and may decrease when the frequency block size decreases. Prior to transmission, the sidelink control channel and data channel may be time division multiplexed (TDMed) on the time axis or frequency division multiplexed (FDMed) on the frequency axis. Therefore, a method and apparatus for controlling UE transmit power to support these different multiplexing methods for sidelink transmit power are needed.

[0060] The embodiments of the present specification are proposed to support the various multiplexing methods described above, and an object is to provide a method and apparatus for controlling the transmission power of a sidelink control channel and a data channel.

[0061] The V2X UE mentioned in this disclosure may refer to an NR V2X UE or an LTE V2X UE. Furthermore, the V2X UE of this disclosure may refer to a vehicle supporting vehicle-to-vehicle (V2V) communication, a vehicle supporting vehicle-to-pedestrian (V2P) communication or a pedestrian's mobile phone (i.e., a smartphone), a vehicle supporting vehicle-to-network (V2N) communication, or a vehicle supporting vehicle-to-infrastructure (V2I) communication. Furthermore, the UE of this disclosure may refer to a roadside unit (RSU) with UE functionality, an RSU with base station functionality, or an RSU with some base station functionality and some UE functionality.

[0062] Figure 1A A system according to an embodiment of the present disclosure is shown. Figure 1B A system according to an embodiment of the present disclosure is shown. Figure 1C A system according to an embodiment of the present disclosure is shown, and Figure 1D A system according to an embodiment of the present disclosure is shown.

[0063] Figure 1A The situation is shown where all V2X UEs (UE-1 101 and UE-2 102) are within the coverage of the base station 103.

[0064] refer to Figure 1A All V2X UEs 101 and 102 can receive data and control information from the base station 103 via a downlink (DL) or transmit data and control information to the base station 103 via an uplink (UL). The data and control information can be used for V2X communication or for general cellular communication. In addition, the V2X UEs 101 and 102 can transmit or receive data and control information for V2X communication via a sidelink (SL).

[0065] Figure 1B A situation is shown where, among the V2X UEs, UE-1 111 is located within the coverage of a base station 113, while UE-2 112 is located outside the coverage of the base station 113. Figure 1B UE-1 111 within the coverage of base station 113 may receive data and control information from base station 113 via a downlink or transmit data and control information to the base station via an uplink.

[0066] refer to Figure 1B UE-2 112 located outside the coverage of the base station may not receive data and control information from the base station via a downlink, nor may it send data and control information to the base station via an uplink.

[0067] UE-2 112 may transmit / receive data and control information for V2X communication to / from UE-1 111 via a side link.

[0068] Figure 1C It shows the situation where all V2X UEs are outside the coverage of the base station.

[0069] Therefore, reference Figure 1C , UE-1 121 and UE-2 122 may not receive data and control information from the base station through a downlink, and may not transmit data and control information to the base station through an uplink.

[0070] UE-1 121 and UE-2 122 may transmit or receive data and control information for V2X communication via a side link.

[0071] Figure 1D The following figure shows a scenario where V2X communication is performed between UEs located in different cells. Specifically, Figure 1D The diagram illustrates a situation where a V2X transmitting UE and a V2X receiving UE access different base stations (Radio Resource Control (RRC) connected state) or reside on different base stations (RRC disconnected state, i.e., RRC idle state). UE-1 131 can be a V2X transmitting UE and UE-2 132 can be a V2X receiving UE, or vice versa. UE-1 131 can receive V2X-specific system information blocks (SIBs) from a base station 133 to which UE-1 is accessed (or on which UE-1 is camping), and UE-2 132 can receive V2X-specific SIBs from another base station 134 to which UE-2 is accessed (or on which UE-2 is camping). The information of the V2X-specific SIBs received by UE-1 131 and the information of the V2X-specific SIBs received by UE-2 132 may differ from each other. Therefore, in order to perform V2X communication between UEs located in different cells, it is necessary to unify multiple pieces of information.

[0072] For ease of description, Figures 1A to 1D A V2X system consisting of two UEs (UE-1 and UE-2) is shown, but the present disclosure is not limited thereto. Furthermore, the uplink and downlink between the base station and the V2X UEs may be referred to as Uu interfaces, and the sidelink between the V2X UEs may be referred to as PC5 interfaces. Therefore, these interfaces may be used interchangeably in the present disclosure.

[0073] At the same time, the UE of the present disclosure can refer to a vehicle supporting vehicle-to-vehicle (V2V) communication, a vehicle supporting vehicle-to-pedestrian (V2P) communication or a pedestrian's mobile phone (i.e., a smartphone), a vehicle supporting vehicle-to-network (V2N) communication, or a vehicle supporting vehicle-to-infrastructure (V2I) communication. In addition, the UE of the present disclosure can refer to a roadside unit (RSU) with UE functionality, an RSU with base station functionality, or an RSU with some base station functionality and some UE functionality.

[0074] In addition, the base station of the present disclosure can be pre-defined as a base station that supports V2X communication and general cellular communication, or a base station that only supports V2X communication. The base station can indicate a 5G base station (gNB), a 4G base station (eNB), or a roadside unit (RSU). Therefore, unless otherwise specified in this disclosure, base stations and RSUs can be used interchangeably as the same concept.

[0075] Figure 2A A V2X communication method performed through a side link according to an embodiment of the present disclosure is shown. Figure 2B A V2X communication method performed through a side link according to an embodiment of the present disclosure is shown.

[0076] refer to Figure 2A , the TX UE (UE-1 201) and the RX UE (UE-2 202) may perform one-to-one communication, and the communication may be referred to as unicast communication.

[0077] refer to Figure 2B , the TX UE and the RX UE may perform one-to-many communication, and this communication may be referred to as groupcast or multicast communication.

[0078] Figure 2B 2 is a diagram showing that UE-1 211, UE-2 212, and UE-3 213 form group A to perform groupcast communication, and UE-4 214, UE-5 215, UE-6 216, and UE-7 217 form group B to perform groupcast communication. Each UE performs multicast communication within the group to which it belongs, and does not perform communication between different groups. Figure 2B It is shown that two groups are formed, but the present disclosure is not limited thereto.

[0079] Despite Figure 2A and Figure 2B Not shown in the figure, V2X UE can perform broadcast communication. Broadcast communication indicates that all V2X UEs receive data and control information sent by V2X transmitting UE via side link. For example, assuming Figure 2BIn the example, UE-1 is a transmitting UE for broadcast communication, and all UEs (UE-2 212, UE-3 213, UE-4 214, UE-5 215, UE-6 216, and UE-7 217) can receive data and control information sent by UE-1 211.

[0080] Figure 3 V2X transmission power control according to an embodiment of the present disclosure is shown.

[0081] refer to Figure 3 , assuming that UE1 301 is located near a base station (gNB) 303 and UE2 302 is located away from gNB 303 (i.e., UE1 is located at the cell center and UE2 is located at the cell edge). When V2X communication is performed between UE1 301 and UE2 302, it is assumed that UE1 301 is a V2X transmitting UE and UE2 302 is a V2X receiving UE. UE1 301 may perform sidelink transmit power control for V2X transmission. Parameters for UE1 301's sidelink transmit power may include at least P0, α, an estimated path loss value, and the size of the allocated frequency block, and may be equal to those shown in Equation 1.

[0082] Side link transmit power = min{Pcmax,P0+αPL+10log10(RB number*2 μ )+Δ}[dBm]......Equation 1

[0083] In Equation 1, each parameter may indicate the following.

[0084] -Pcmax: Pcmax is the P-max value (this is a preset value when there is no base station), indicating the maximum UE transmission output, which is set by the base station through system information or RRC and can be determined by the UE through the UE power level contained in the UE.

[0085] -P0: P0 may indicate a value set by the base station through system information or RRC to guarantee the link quality of the receiving UE (when there is no base station, this is a preset value).

[0086] -α: α is a parameter for compensating for the path loss value, has a value between 0 and 1, and may indicate a value set by the base station through system information or RRC (when there is no base station, this is a preset value). For example, when α = 1, 100% of the path loss can be compensated, and when α = 0.8, only 80% of the path loss can be compensated.

[0087] - Resource Block (RB) Number: The resource block number may indicate the size of the frequency block allocated for sidelink transmission. μIt can be a parameter for compensating for power spectral density (PSD), which varies according to the subcarrier spacing. For example, the case of using a subcarrier spacing of 15 kHz can indicate μ = 0. Even if the same number of frequency blocks is used, when the subcarrier spacing is doubled to 30 kHz, the PSD can be reduced by half compared to the case of using a subcarrier spacing of 15 kHz. Therefore, in order to compensate for PSD, power doubling is required. More specifically, for example, when two frequency blocks are used, 10log10 (2x2 0 )=3dB, and in order to maintain the same PSD as the 15kHz subcarrier spacing, the transmit power needs to be increased to 10log10(2x2 1 )=6dB.

[0088] -PL: PL may indicate an estimated path loss value. The path loss value may be estimated by Equation 2.

[0089] (Transmit power of the signal used for path loss estimation) - (Measured reference signal received power (RSRP) value of the signal used for path loss estimation) ... Equation 2

[0090] Equation 2 may be applied differently according to the following scenarios.

[0091] *When the signal used for path loss estimation is a sidelink signal: UE1 301, which is a V2X transmitting UE, can transmit a sidelink synchronization signal or a sidelink reference signal to UE2 302, which is a V2X receiving UE. UE2 302 can receive the sidelink synchronization signal or the sidelink reference signal to measure the RSRP value and report the measured RSRP value to UE1 301. The RSRP value can be transmitted via a physical sidelink feedback channel (PSFCH) or a physical sidelink shared channel (PSSCH). In addition, when the RSRP value is transmitted via the PSSCH, a medium access control (MAC) control element (CE) can be used. UE1 301 can estimate the sidelink path loss value using Equation 2 based on the transmit power of the reference signal transmitted by UE1 to UE2 302 and the RSRP value reported from UE2 302. In another example, UE1 301 can transmit information about the transmit power of the reference signal transmitted by UE1 to UE2 302. Upon receiving this information, UE2 302 can measure the RSRP value by using the reference signal transmitted by UE1 and estimate the path loss value by using Equation 2. UE-2 302 can transmit the estimated sidelink path loss value to UE1 301 via PSFCH or PSSCH. When the estimated sidelink path loss value is transmitted via PSSCH, MAC CE can be used. However, if Figure 3As shown, when the distance between UE1 301 and UE2 302 is greater than the distance between UE1 301 and gNB 303, the sidelink signal sent by UE1 301 may interfere with the gNB receiving signal.

[0092] Figure 4 The figure shows the interference caused by the frequency block transmitted by the V2X UE in the adjacent frequency blocks according to an embodiment of the present disclosure.

[0093] Figure 5 The figure shows the interference caused by the frequency block transmitted by the V2X UE in the adjacent frequency blocks according to an embodiment of the present disclosure.

[0094] Figure 4 and Figure 5 It shows the interference level caused by the sidelink signal in the gNB received signal. Figure 4 , assuming that the side link control information or data information is sent in resource block index 12 (using one resource block), refer to Figure 5 , it is assumed that side link control information or data information is transmitted by using five resource blocks with resource block indices ranging from 12 to 17. Figure 4 , since sidelink transmission is performed only in resource block index 12, transmission power should be generated only in the corresponding resource index, but it is found that transmission power is generated even in adjacent resource indices (e.g., indices 9, 10, 11, 13, 14, and 15) due to interference (in-band transmission). Figure 5 As shown in Figure 2, the amount of interference increases with the number of resource blocks allocated for sidelink transmission. Therefore, V2X UEs located near the gNB need to use low transmit power to avoid interfering with the gNB's received signal.

[0095] *When the signal used for path loss estimation is the downlink signal of the gNB: In order to reduce the interference caused to the reception signal of the gNB, UE1, which is a V2X transmitting UE, can apply the downlink path loss value of the gNB to Equation 1. More specifically, UE1 can estimate the downlink path loss value through the channel state information (CSI) reference signal (RS) transmitted by the gNB. In another example, UE1 can estimate the downlink path loss value using the secondary synchronization signal (SSS) transmitted by the gNB, or both the SSS and the demodulation reference signal (DMRS) transmitted through the physical broadcast channel (PBCH). More specifically, the gNB can send information about the transmit power of the reference signal to UE1 through system information or RRC configuration, and UE1 can measure the RSRP value by using the reference signal sent by the gNB. UE1 can estimate the downlink path loss value using Equation 2 by using the transmit power value of the reference signal transmitted from the base station and the RSRP value measured thereby. Since the downlink path loss value is used, problems such as Figure 4 and Figure 5 The problem shown causes interference to the gNB's received signal.

[0096] Figure 6 V2X transmission power control according to an embodiment of the present disclosure is shown.

[0097] refer to Figure 6 In the case where the V2X UEs 601 and 602 are close to each other but far away from the gNB 603, using the downlink path loss value may result in unnecessary power consumption and interference in the neighboring V2X UEs. Therefore, both of the above methods may be required.

[0098] * That is, the gNB can configure which reference signal the UE uses in Equation 1 to estimate the path loss (PL) (i.e., whether to use SSS or CSI-RS to estimate the downlink path loss, or to use the sidelink reference signal to estimate the sidelink path loss).

[0099] -Δ: Δ may indicate a transmit power control (TPC) command or other RRC parameter for closed-loop power control. For example, Δ may indicate an offset value of the transmit power according to the format of the sidelink control channel or the sidelink data channel. In another example, Δ may indicate a compensation value of the transmit power according to the spectral efficiency of the sidelink control channel or the sidelink data channel. That is, since higher transmit power is required as the spectral efficiency becomes higher (i.e., the case where fewer resources are used to send the same bits or the case where more bits are sent by using the same number of resources), Δ may be a parameter that compensates the transmit power value according to the spectral efficiency. In Equation 1, Δ is shown as being composed of a single parameter, but may also be composed of a combination of two or more parameters shown previously.

[0100] Figure 7 2 is a diagram illustrating side link resources used by a V2X UE to perform V2X communication according to an embodiment of the present disclosure.

[0101] refer to Figure 7 , the sidelink resources can be composed of K symbols on the time axis and M resource blocks (RBs) on the frequency axis. One resource block can be composed of twelve subcarriers. The K symbols can be physically continuous or logically continuous on the time axis (in the case of logical continuity, the symbols can be physically discontinuous). Similarly, the M resource blocks can be physically continuous or logically continuous on the frequency axis (in the case of logical continuity, the blocks can be physically discontinuous). Although Figure 7 Not shown, V2X sending UE can use Figure 7 In addition, the V2X receiving UE can use the side link resources to send side link control information or data information. Figure 7 In another example, the V2X receiving UE can use the side link resources of Figure 7 The side link resources of the UE send side link feedback information to the V2X. Figure 7 , the values ​​of K and M may be the same or different depending on the transmission time of the sidelink control information or data information. For example, when the V2X transmitting UE transmits the sidelink control information (or sidelink data information) at time T1, the values ​​of K and M may be the same or different from the values ​​of K and M when the V2X transmitting UE transmits the sidelink control information (or sidelink data information) at time T2. Similarly, referring to Figure 7 , depending on the time when the V2X receiving UE receives the sidelink control information or data information, the values ​​of K and M may be the same or different. For example, the values ​​of K and M when the V2X receiving UE receives the sidelink control information (or sidelink data information) at time T1 may be equal to or different from the values ​​of K and M when the V2X receiving UE receives the sidelink control information (or sidelink data information) at time T2. In addition, referring to Figure 7 Depending on the time when the V2X receiving UE sends the UE transmission side link feedback information to the V2X, the values ​​of K and M may be the same or different. For example, the values ​​of K and M when the V2X receiving UE sends the UE transmission side link feedback information to the V2X at time T1 may be equal to or different from the values ​​of K and M when the V2X receiving UE sends the UE transmission side link feedback information to the V2X at time T2.

[0102] Figure 8 A method for multiplexing a sidelink control channel and a sidelink data channel within a sidelink resource according to an embodiment of the present disclosure is shown.

[0103] refer to Figure 8, which shows the multiplexing of the physical sidelink control channel (PSCCH) and the physical sidelink shared channel (PSSCH) on the time axis, i.e., time division multiplexing (TDM). The PSCCH and PSSCH can be composed of the same number of resource blocks (M RBs) on the frequency axis, and can be composed of K1 symbols and K2 symbols on the time axis respectively. The values of K1 and K2 can be equal to or different from each other. In addition, when the values of K1 and K2 are different from each other, these values can be K1>K2 or K1<K2. The V2X transmitting UE can send sidelink control (SCI) information including the time / frequency allocation information of the PSSCH through the PSCCH. The V2X receiving UE can receive and decode the PSCCH, and then can obtain the time / frequency allocation information of the PSSCH and decode the PSSCH. Figure 8 shows the PSSCH composed of K2 symbols, which is physically continuously located after the PSCCH composed of K1 symbols, although they may not be physically continuously located (i.e., the PSSCH can be logically continuously located, rather than physically continuously located after the PSCCH). In addition, although Figure 8 is not shown, a physical sidelink feedback channel (PSFCH) can exist in the sidelink resource composed of K symbols. The PSCCH can be composed of K1 symbols, the PSSCH can be composed of K2 symbols and guard symbols, the PSFCH can be composed of K3 symbols, and K1+K2+the number of guard symbols+K3 can be less than K. The guard symbols can be one or at least two OFDM symbols. The V2X receiving UE can decode the PSSCH, and then can send a PSFCH including the result (i.e., ACK / NACK information) to the V2X transmitting UE.

[0104] At the i-th transmission time, the V2X UE uses Figure 8 The sidelink resource structure of can determine each of the transmission power (P PSCCH ) of the PSCCH and the transmission power (P PSSCH ) of the PSSCH through Equation 3.

[0105] P PSCCH (i)=min{Pcmax(i),P 0_PSCCH +α PSCCH* PL(q)+10log10(M*2 μ )+Δ PSCCH}(i)[dBm]

[0106] P PSSCH (i)=min{Pcmax(i),P 0_PSSCH +α PSSCH* PL(q)+10log10(M*2 μ )+Δ PSSCH(i)}[dBm]...Equation 3

[0107] In Equation 3, each parameter may indicate the following.

[0108] -Pcmax(i): Pcmax(i) is the P-max value (preset when no base station is present), indicating the maximum UE transmit output at the i-th transmit time. It is set by the base station via system information or RRC, and can also be determined by the UE based on the communication range and the UE power class contained in the UE. Since Pcmax(i) is a function of the index "i", different transmit times can result in different Pcmax values.

[0109] -P 0_PSCCH 、P 0_PSSCH :P 0_PSCCH and P 0_PSSCH It can indicate a parameter set by the base station through system information or RRC for ensuring the link quality of each of PSCCH and PSSCH (when there is no base station, it is a preset value). 0_PSCCH and P 0_PSSCH The values ​​of may be different from each other depending on the sidelink scheduling method. For example, the base station may send UE scheduling sidelink transmission resources to the V2X through downlink control information (DCI). It may be referred to as a mode 1 resource allocation method. In another scheduling method, the gNB may configure resource pool information for the sidelink transmission, and the V2X transmitting UE itself may determine the resources required to send the sidelink control information and data information. It may be referred to as a mode 2 resource allocation method. Because in the case of mode 1, the gNB may manage resources in a centralized manner, the gNB may control interference and resource conflict problems between different V2X UEs. On the other hand, in the case of mode 2, since the UE manages resources in a distributed manner, interference and resource conflict problems may occur between different V2X UEs compared to mode 1. Therefore, the P0 values ​​sent by the sidelinks of mode 1 and mode 2 may be different. That is, the P0 value of mode 1 is different from that of mode 1. 0_PSCCH and P in mode 2 0_PSCCH In addition, the P of mode 1 0_PSSCH and P in mode 2 0_PSSCH have different values. In another example, Figure 2A and Figure 2BAs shown, the V2X UE can perform V2X communication by using one of unicast, groupcast, and broadcast communication methods. Depending on the communication method, different link qualities may be required. For example, in the case of unicast communication, since hybrid automatic repeat request (HARQ) ACK / NACK transmission can be performed through the sidelink feedback channel, the degradation of link quality can be reduced. However, in the case of broadcast communication, since sidelink feedback transmission is impossible, a higher link quality may be required compared to unicast communication. Therefore, P 0_PSCCH and P 0_PSSCH The value of may be different from each other according to the communication method including unicast, multicast and broadcast communication methods. As described above, P 0_PSCCH and P 0_PSSCH The value of may be sent to the UE by the base station through system information or RRC configuration, or may be a preset value when there is no base station. Therefore, the base station may not be able to identify the V2X communication method (unicast / multicast / broadcast) that the sidelink UE is going to send. The base station may not know when the UE should use P 0_PSCCH and P 0_PSSCH The value of P should be used 0_PSCCH and P 0_PSSCH To solve these problems, the following operations can be assumed. For each communication method, there may be one or more different related resource pools. For example, the base station may configure one or more resource pools for unicast communication (e.g., resource pool 1, resource pool 2), one or more resource pools for multicast communication (e.g., resource pool 3, resource pool 4), and one or more resource pools for broadcast communication (e.g., resource pool 5, resource pool 6) for the UE. 0_PSCCH and P 0_PSSCH The value of may vary depending on the resource pool. In another example, P 0_PSCCH Can be made by P 0_PSCCH1 and P 0_PSCCH2 Composition, P 0_PSSCH Can be made by P 0_PSSCH1 and P 0_PSSCH2 All UEs in the cell can receive information about P 0_PSCCH1 and P 0_PSSCH1 Different V2X UEs in a cell can receive information about P 0_PSCCH2 and P 0_PSSCH2 In the above example, P 0_PSCCH1 and P 0_PSSCH1 It can be independent of the communication type (ie, the same value is applied to unicast, multicast, and broadcast communications), and P 0_PSCCH2 and P 0_PSSCH2 May vary depending on the type of communication.

[0110] -α PSCCH , αPSSCH :α PSCCH and α PSSCH α is a parameter used to compensate for the path loss value of PSCCH and PSSCH, respectively, with a value between 0 and 1, and can indicate a value set by the base station through system information or RRC (when there is no base station, it is a preset value). For example, when α=1, 100% of the path loss can be compensated, and when α=0.8, only 80% of the path loss can be compensated. 0_PSCCH and P 0_PSSCH Same, mode 1 α PSCCH and α of mode 2 PSCCH Can have different values. In addition, α of mode 1 PSSCH and α of mode 2 PSSCH can have different values. In addition, α PSCCH and α PSSCH The value of α can be set to be different according to the communication method including unicast, multicast and broadcast communication methods. PSCCH and α PSSCH Can have a different value for each resource pool.

[0111] -M: M may indicate the size of the frequency block allocated for sidelink transmission. Figure 8 , because both PSCCH and PSSCH use M frequency blocks, 10log10(M2 μ ) value. 2 μ It can be a parameter for compensating for power spectral density (PSD), which differs depending on the subcarrier spacing. For example, the case of using a subcarrier spacing of 15 kHz can indicate μ = 0. Even if the same number of frequency blocks is used, when the subcarrier spacing is doubled to 30 kHz, the PSD can be reduced by half compared to the case of using a subcarrier spacing of 15 kHz. Therefore, in order to compensate for PSD, doubling of power is required. More specifically, for example, when two frequency blocks are used, 10log10 (2x2 0 )=3dB, and in order to maintain the same PSD as the 15kHz subcarrier spacing, the transmit power needs to be increased to 10log10(2x2 1 )=6dB.

[0112] -PL(q): PL(q) may indicate an estimated path loss value. The path loss value may be estimated by Equation 2. The index "q" may indicate an index of a reference signal used for path loss estimation. For example, when q = 0, the V2X transmitting UE may use the SSS transmitted by the gNB, or the SSS and DMRS transmitted through the PBCH, in order to estimate the path loss value in Equation 3. When q = 1, the V2X transmitting UE may use the CSI-RS transmitted by the gNB in ​​order to estimate the path loss value in Equation 3. When q = 2, the V2X transmitting UE may use the sidelink reference signal in estimating the path loss value in Equation 3. When the path loss of Equation 3 is estimated by the sidelink reference signal, the sidelink reference signal may be used. Figure 3 One of the two methods mentioned in [1]. That is, there is a method in which the V2X receiving UE estimates the sidelink path loss and transmits the result to the V2X transmitting UE, and there is a method in which the V2X transmitting UE estimates the sidelink path loss using the RSRP measured and reported by the V2X receiving UE. A reference signal index "q" can be associated with each resource pool. That is, different resource pools can be set with different reference signal indices, and a UE receiving the set index can determine whether to apply the downlink path loss to the base station or the sidelink path loss.

[0113] *As described above, when receiving resource pool information from the base station through system information and RRC configuration, the V2X UE can use the P included in the resource pool information. 0_PSCCH 、P 0_PSSCH , α PSCCH , α PSSCH and the index information of the reference signal used for path loss estimation, and thus set the transmit power values ​​of PSCCH and PSSCH through Equation 3.

[0114] -Δ PSCCH , Δ PSSCH :Δ PSCCH and Δ PSSCH It can indicate TPC commands or other RRC parameters used for closed loop power control. PSCCH and Δ PSSCH The offset value of the transmit power may be indicated according to the format of the sidelink control channel or the sidelink data channel. PSCCH and Δ PSSCH The compensation value of the transmission power may be indicated according to the spectrum efficiency of the sidelink control channel or the sidelink data channel. That is, since a higher transmission power is required as the spectrum efficiency becomes higher (i.e., the case where fewer resources are used to transmit the same bit or the case where more bits are transmitted by using the same amount of resources), Δ PSCCH and Δ PSSCHIt can be a parameter that compensates the transmit power value according to the spectrum efficiency. In equation 3, Δ PSCCH and Δ PSSCH is shown as consisting of a single parameter, but may also consist of a combination of two or more parameters shown previously. In another example, when closed-loop power control is not operating on the sidelink, Δ may be omitted from Equation 3. PSCCH and Δ PSSCH .

[0115] In the above example, a UE outside the coverage of a base station may not receive information about the P from the base station. 0_PSCCH , α PSCCH , Δ PSCCH and P 0_PSSCH , α PSSCH , Δ PSSCH Parameter settings. Therefore, these UEs can use preset values ​​for the parameters. The preset values ​​may include 0, 0 dB, or 0 dBm. The preset values ​​may indicate values ​​input into the UE at the factory, or values ​​set by the base station when the UE was once within the coverage of the base station (the UE is now outside the coverage of the base station).

[0116] * In addition, in the above example, even if the UE exists within the coverage of the base station, when a UE pairing for performing unicast communication is not formed (for example, before PC5 RRC configuration is completed in the PC5 RRC layer of UE A and UE B), or before a UE grouping for performing multicast communication is formed, parameter exchange between UEs may not be performed (assuming that parameter exchange between UEs is performed in the PC5 RRC layer). The transmitting UE for unicast and multicast communication may not set the transmit power value based on the side link path loss measurement. Therefore, as in the above method, a preset value may be used, or a P value transmitted from the base station through the RRC configuration and system information of the base station may be used. 0_PSCCH , α PSCCH , Δ PSCCH and P 0_PSSCH , α PSSCH , Δ PSSCH The value of P used at this time 0_PSCCH , α PSCCH , Δ PSCCH and P 0_PSSCH , α PSSCH , Δ PSSCH The value can be used with PC5 RRC after configuration 0_PSCCH , α PSCCH , Δ PSCCH and P 0_PSSCH , α PSSCH , Δ PSSCHThe values are different. Before the PC5 RRC configuration, the PL(q) used by the transmitting UE in Equation 3 can indicate the path loss value of the Uu link between the base station and the transmitting UE, rather than the sidelink path loss value.

[0117] *In another example, when in the above example, the PSCCH, PSSCH, and PSFCH should be transmitted before the completion of the PC5 RRC configuration between UEs for unicast or multicast communication, the V2X UE can use a preset transmit power value (e.g., [X] dBm) or a transmit power value set by the base station. The preset transmit power values (or the transmit power values set by the base station) for transmitting the PSCCH, PSSCH, and PSFCH can be different from each other.

[0118] *In another example, the preset transmit power values of the PSCCH, PSSCH, and PSFCH or the transmit power values set by the base station can be expressed as the transmit power value and offset value with respect to one channel. For example, when presetting the transmit power values of the PSCCH, PSSCH, and PSFCH, the transmit power value of the PSCCH can be set to [X] dBm, and based on the transmit power value of the PSCCH, the offset values of the transmit powers of the PSSCH and PSFCH can be set to + / -[Y] dB (or dBm). This also applies even if the transmit power values of the PSCCH, PSSCH, and PSFCH are set by the base station.

[0119] Figure 9 Fig. shows a method for multiplexing a sidelink control channel and a sidelink data channel within a sidelink resource according to an embodiment of the present disclosure.

[0120] Reference Figure 9 , Figure 9 Fig. shows that the PSCCH and PSSCH are time-division multiplexed, but different from Figure 8 , Figure 9 Fig. shows that the PSCCH and PSSCH are composed of different numbers of resource blocks on the frequency axis. That is, on the frequency axis, the PSCCH can be composed of N1 frequency blocks, and the PSSCH can be composed of M frequency blocks. N1 can be less than M (N1 < M). At the same time, similar to Figure 8 ,on the time axis, the PSCCH can be composed of K1 symbols, and the PSSCH can be composed of K2 symbols. The values of K1 and K2 are equal to or different from each other. In addition, when the values of K1 and K2 are different from each other, these values can be K1 > K2 or K1 < K2. The V2X transmitting UE can send sidelink control information (SCI) including the time / frequency allocation information of the PSSCH through the PSCCH. The V2X receiving UE can receive and decode the PSCCH, and then can obtain the time / frequency allocation information of the PSSCH and decode the PSSCH. Figure 9 The PSSCH consisting of K2 symbols is shown as being physically located contiguously after the PSCCH consisting of K1 symbols, although they may not be located physically contiguously (i.e., the PSSCH may be logically located contiguously, rather than physically located contiguously after the PSCCH). Figure 9 Not shown in the figure, the PSFCH may be present in a sidelink resource consisting of K symbols. The PSCCH may be composed of K1 symbols, the PSSCH may be composed of K2 symbols and guard symbols, and the PSFCH may be composed of K3 symbols, and K1+K2+the number of guard symbols+K3 may be equal to or less than K. The guard symbol may be one or at least two OFDM symbols. In addition, on the frequency axis of the PSFCH, the size of the resource block may be equal to or different from the size of the resource block of the PSCCH and PSSCH. The V2X receiving UE may decode the PSSCH and then send the PSFCH including the result (i.e., ACK / NACK information) to the V2X transmitting UE.

[0121] At the i-th sending time, use Figure 9 The V2X UE with the side link resource structure can determine the transmit power (P PSCCH ) and the transmit power of PSSCH (P PSSCH ) in each of the .

[0122] P PSCCH (i)=min{Pcmax(i),P 0_PSCCH +α PSCCH* PL(q)+10log10(N1*2 μ )+Δ PSCCH (i)}[dBm]

[0123] P PSSCH (i)=min{Pcmax(i),P 0_PSSCH +α PSSCH* PL(q)+10log10(M*2 μ )+Δ PSSCH (i)}[dBm]...Equation 4

[0124] In Equation 4, each parameter can be interpreted as Figure 8 The difference between Equation 4 and Equation 3 is that the size of the frequency block allocated to the PSCCH is different. That is, in Equation 4, N1 frequency blocks are used, while in Equation 3, M frequency blocks are used.

[0125] The P used in Equation 4 0_PSCCH , α PSCCH , Δ PSCCHand P 0_PSSCH , α PSSCH , Δ PSSCH The definition and usage of the parameters can be equal to Figure 8 For example, the transmit power parameter used in Equation 4 can use the setting value received by the transmitting UE from the base station, or can use the setting value received by the transmitting UE from the base station. Figure 8 and Figure 9 The method mentioned in the preceding paragraph is a value preset by the UE. For example, a UE that leaves the coverage of a base station may not receive settings regarding a transmit power parameter from the base station. Therefore, these UEs may use preset values ​​regarding the parameters. The set values ​​may include 0, 0dB, or 0dBm. The preset value may indicate a value input into the UE at the factory, or may indicate a value set by the base station when the UE was once within the coverage of the base station (the UE is now outside the coverage of the base station).

[0126] In another example, even if the UE is within the coverage of the base station, when a UE pairing for performing unicast communication is not formed (for example, before the PC5 RRC configuration is completed in the PC5 RRC layer of UE A and UE B), or before a UE grouping for performing multicast communication is formed, parameter exchange between UEs may not be performed (assuming that parameter exchange between UEs is performed in the PC5 RRC layer). The transmitting UE for unicast and multicast communication may not set the transmit power value based on the side link path loss signal. To this end, a preset value for the parameter may be used, or a value sent from the base station through the RRC configuration and system information of the base station may be used. The parameter value used at this time may be different from the parameter value used after the PC5 RRC configuration. The PL(q) used by the transmitting UE before the PC5 RRC configuration in Equations 7, 8, 9, 10, and 11 may indicate a path loss value for the Uu link between the base station and the transmitting UE, rather than a side link path loss value. In addition, when the UE uses preset parameters, each parameter may include a value of 0, 0 dB, or 0 dBm.

[0127] In another example, when the PSCCH, PSSCH, and PSFCH are to be transmitted before PC5 RRC configuration is completed between UEs to perform unicast or multicast communication in the above example, the V2X UE may use a preset transmit power value (e.g., [X] dBm) or a transmit power value set by the base station. The transmit power values ​​preset for transmitting the PSCCH, PSSCH, and PSFCH (or the transmit power values ​​set by the base station) may be different from each other.

[0128] In another example, the preset transmit power values ​​of PSCCH, PSSCH, and PSFCH or the transmit power values ​​set by the base station can be expressed as a transmit power value and an offset value relative to one channel. For example, when the transmit power values ​​of PSCCH, PSSCH, and PSFCH are preset, the transmit power value of PSCCH can be set to [X]dBm, and based on the transmit power value of PSCCH, the offset values ​​of the transmit power of PSSCH and PSFCH can be set to + / -[Y]dB (or dBm). This is also applicable even if the transmit power values ​​of PSCCH, PSSCH, and PSFCH are set by the base station.

[0129] Figure 10 The V2X frame structure according to an embodiment of the present disclosure is shown.

[0130] refer to Figure 10 , Figure 10 Not like Figure 8 and Figure 9 , which shows that PSCCH and PSSCH are frequency-division multiplexed on the frequency axis, and is similar to Figure 9 , showing that the PSCCH and PSSCH are composed of different numbers of resource blocks. That is, on the frequency axis, the PSCCH can be composed of N1 frequency blocks, the PSSCH can be composed of M frequency blocks, and on the time axis, the PSCCH and PSSCH can be composed of the same number of symbols. N1 can be equal to or different from M. The V2X transmitting UE can send sidelink control information (SCI) including time / frequency allocation information of the PSSCH through the PSCCH. The V2X receiving UE can receive and decode the PSCCH, and then can obtain the time / frequency allocation information of the PSSCH and decode the PSSCH. Figure 10 The PSSCH composed of (M-N2) frequency blocks is shown to be physically located continuously after the PSCCH composed of N1 frequency blocks, although they may not be physically located continuously (i.e., the PSSCH may be logically located continuously, rather than physically located continuously after the PSCCH). In addition, although Figure 10 Although not shown, a PSFCH may exist in the latter portion of the K symbols. More specifically, the PSCCH and PSSCH may consist of K1 symbols and guard symbols, and the PSFCH may consist of K2 symbols, where K1 + the number of guard symbols + K2 may be equal to or less than K. The guard symbol may be one or at least two OFDM symbols. The V2X receiving UE may decode the PSSCH and then transmit the PSFCH including the result (i.e., ACK / NACK information) to the V2X transmitting UE.

[0131] At the i-th sending time, use Figure 10The V2X UE with the side link resource structure can determine the transmit power (P PSCCH ) and the transmit power of PSSCH (P PSSCH ) in each of the .

[0132] P PSCCH (i)=γ1+min{Pcmax(i),P 0_PSCCH +α PSCCH* PL(q)+β+Δ PSCCH (i)}[dBm]

[0133] P PSSCH (i)=γ2+min{Pcmax(i),P 0_PSSCH +α PSSCH* PL(q)+β+Δ PSSCH (i)}[dBm]...Equation 5

[0134] In Equation 5, each parameter is indicated as follows.

[0135] -γ1,γ2: Reference Figure 10 Because PSCCH and PSSCH are frequency-division multiplexed, they can be transmitted simultaneously at the i-th time. Therefore, the V2X UE's transmit power needs to be appropriately allocated to PSCCH and PSSCH at the i-th sidelink transmission time. γ1 and γ2 indicate the values ​​of power allocated to PSCCH and PSSCH, and can be expressed as shown in Equation 6.

[0136] γ1=10log10{(10^(ε / 10)x N1) / [(M-N1)+10^(ε / 10)x N1]}[dB]

[0137] γ2=10log10{[10^(ε / 10)x(M-N1)] / [(M-N1)+10^(ε / 10)x N1]}[dB]...Equation 6

[0138] ε indicates a value representing the difference between the PSDs of PSCCH and PSSCH, and may have a unit of [dB]. For example, when PSCCH and PSSCH use the same PSD, ε may be 0. Generally, the control channel is required to ensure higher reliability than the data channel. In this case, the PSD of PSCCH is higher than that of PSSCH. For example, when ε=3, it may indicate that the PSD of PSCCH is 3dB higher than that of PSSCH. A fixed value is always used as the value of ε (e.g., ε=3), or the base station may send the value of ε to the UE through system information or RRC configuration. In this case, as Figure 8 and 9 As described in , you can set a different ε value for each resource pool.

[0139] - In Equation 5, β may indicate 10log10[(M-N1)+10^(ε / 10)x N1][dB].

[0140] - In Equation 5, the definition and use of parameters other than γ1, γ2 and β can be the same as Figure 8 and Figure 9 For example, regarding the transmit power parameter used in Equation 5, the transmitting UE can Figures 8 to 10 The method mentioned in utilizes a value set by the base station or a value preset for the UE. For example, a UE that is outside the coverage of a base station may not receive the sidelink transmit power parameter set by the base station. Therefore, these UEs can use the preset value for the parameter. The set value may include 0, 0dB, or 0dBm. The preset value may indicate a value input to the UE at the factory, or may indicate a value set by the base station when the UE was once within the coverage of the base station (the UE is now outside the coverage of the base station).

[0141] In another example, even if the UE is within the coverage of the base station, when a unicast UE pair for performing unicast communication is not formed (for example, when the PC5 RRC configuration is not completed), or before a UE group for performing multicast communication is formed, parameter exchange between UEs to perform unicast / multicast communication may not be performed. Therefore, the sending UE for unicast and multicast communication may not set the side link transmit power value based on the side link path loss value. To this end, for the mentioned parameters, preset values ​​may be used, or values ​​sent from the base station through the RRC configuration and system information of the base station may be used. The parameter values ​​used at this time may be different from the parameter values ​​used after the PC5 RRC configuration. The PL(q) used by the sending UE before the PC5 RRC configuration in Equations 7, 8, 9, 10, and 11 may indicate a path loss value for the Uu link between the base station and the sending UE, rather than a side link path loss value. In addition, when the UE uses preset parameters, each parameter may include a value of 0, 0dB, or 0dBm.

[0142] In another example, the preset transmit power values ​​of PSCCH, PSSCH, and PSFCH or the transmit power values ​​set by the base station can be expressed as a transmit power value and an offset value relative to one channel. For example, when the transmit power values ​​of PSCCH, PSSCH, and PSFCH are preset, the transmit power value of PSCCH can be set to [X]dBm, and based on the transmit power value of PSCCH, the offset values ​​of the transmit power of PSSCH and PSFCH can be set to + / -[Y]dB (or dBm). This is also applicable even if the transmit power values ​​of PSCCH, PSSCH, and PSFCH are set by the base station.

[0143] Figure 11 Shows a V2X frame structure according to an embodiment of the present disclosure.

[0144] Refer to Figure 11 , which is considered to be Figure 9 and Figure 10 a combination of, which shows that the PSCCH and PSSCH are frequency division multiplexed in K1 symbols, and in the remaining K2 symbols, only the PSSCH is transmitted without the PSCCH being transmitted. The PSCCH can be composed of N1 frequency blocks on the frequency axis and can be composed of K1 symbols on the time axis. The PSSCH can be composed of N2 frequency blocks during the K1 symbol length and can be frequency division with the PSCCH. During the length of the K2 symbols, the PSSCH is not frequency division with the PSCCH and can be composed of M frequency blocks. The sum of N1 and N2 can be equal to or different from M. Figure 11 Shows that the PSCCH composed of N1 frequency blocks and the PSSCH composed of (M - N2) frequency blocks are physically continuously located, but they may not be physically continuously located (i.e., they can be logically continuously located without being physically continuously located). At the same time, the values of K1 and K2 can be equal to or different from each other. When the values of K1 and K2 are different from each other, it can be K1 > K2 or K1 < K2. The V2X transmitting UE can transmit sidelink control information including the time / frequency allocation information of the PSSCH through the PSCCH. The V2X receiving UE can receive and decode the PSCCH, and then can obtain the time / frequency allocation information of the PSSCH and decode the PSSCH. Figure 11 Shows the PSSCH composed of K2 symbols, which is physically continuously located after the PSCCH composed of K1 symbols, although they may not be physically continuously located (i.e., the PSSCH can be logically continuously located rather than physically continuously located after the PSCCH).

[0145] Although Figure 11 not shown in, the PSFCH can exist in the sidelink resources composed of K symbols. The PSCCH can be composed of K1 symbols, the PSSCH can be composed of K1 + K2 symbols and protection symbols, the PSFCH can be composed of K3 symbols, and the number of K1 + K2 + protection symbols + K3 can be equal to or less than K. The protection symbols can be one or at least two OFDM symbols. Additionally, on the frequency axis of the PSFCH, the size of the resource block can be equal to or different from the size of the resource blocks of the PSCCH and PSSCH. The V2X receiving UE can decode the PSSCH and then send the PSFCH including the result (i.e., ACK / NACK information) to the V2X transmitting UE.

[0146] At the i-th sending time, use Figure 11 The V2X UE of the sidelink resource structure can determine the transmit power (P) of the PSCCH by using one of the following methods: PSCCH ) and the transmit power of PSSCH (P PSSCH ).

[0147] Method 1) Independent setting for determining P PSCCH and P PSSCH Parameters.

[0148] Method 1-1) Reduce or increase the transmission power

[0149] -UE can temporarily calculate P through Equation 7 PSCCH and P PSSCH The value of .

[0150] P PSCCH (i) = P 0_PSCCH +α PSCCH* PL(q)+10log10(N1*2 μ )+Δ PSCCH (i)[dBm]

[0151] P PSSCH-1 (i) = P 0_PSSCH +α PSSCH* PL(q)+10log10(N2*2 μ )+Δ PSSCH (i)[dBm]

[0152] P PSSCH-2 (i) = P 0_PSSCH +α PSSCH* PL(q)+10log10(M*2 μ )+Δ PSSCH (i)[dBm]

[0153] ...Equation 7

[0154] In Equation 7, the reference Figure 11 , P PSSCH-1 It can indicate the transmission power of PSSCH when PSCCH and PSSCH are frequency-divided and transmitted during a portion of K1 symbols. Figure 11 , PPSSCH-2 may indicate the transmit power of the PSSCH when only the PSCCH is transmitted during a portion of K2 symbols. Problems may arise when the transmit power of symbols of the same channel changes during one sidelink transmission time (e.g., sidelink transmission time i). Specifically, during Figure 11Among them, PSCCH and PSSCH are transmitted simultaneously during the part of K1 symbols, and only PSSCH is transmitted during the part of K2 symbols. As shown in Equation 7, PSCCH and PSSCH can use different transmit power control parameters. Therefore, at sidelink transmission time i, the transmit power for transmitting K1 symbols can be different from the transmit power for transmitting K2 symbols. In this case, due to phase shift and discontinuity, the transmitted signal may be transmitted while being distorted. To solve this problem, it is necessary to set the transmit power for transmitting K1 symbols and the transmit power for transmitting K2 symbols to have the same value, and this can be achieved by Equation 8 or Equation 9.

[0155] P Sidelink (i)=min{Pcmax(i),P<000016​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​(i)+P PSSCH-1 (i), and the P obtained by Equation 7 can be PSSCH-2 (i) scaled down by w1 such that P is satisfied PSCCH (i)+P PSSCH-1 (i) = w1 * P PSSCH-2 (i). w1 can have a value greater than 0 and equal to 1 or less than 1.

[0164] * In the case of using Equation 9, the transmit power for the i-th sidelink transmission can be P Sidelink (i) = P PSSCH-2 (i), and the P obtained by Equation 7 can be PSCCH (i)+P PSSCH-1 (i) scaled up by w1 such that P is satisfied PSSCH-2 (i) = w1[P PSCCH (i)+P PSSCH-1 (i)]. w1 can have a value greater than 1.

[0165] - In another example, at the i-th sidelink transmission time, P can occur PSSCH-2 (i) < P PSCCH (i)+P PSSCH-1 (i) < Pcmax(i).

[0166] * By Equation 8, the transmit power for the i-th sidelink transmission can be P Sidelink (i) = P PSSCH-2 (i), and the P obtained by Equation 7 can be PSCCH [[ID=!45]](i)+P PSSCH-1 (i) scaled down by w1 such that P is satisfied PSSCH-2 (i) = w1[P PSCCH (i)+P PSSCH-1 (i)]. w1 can have a value greater than 0 and equal to 1 or less than 1.

[0167] * By Equation 9, the transmit power for the i-th sidelink transmission can be P Sidelink (i) = P PSCCH (i)+P PSSCH-1 (i), and the P obtained by Equation 7 can be PSSCH-2 (i) scaled up by w1 such that P is satisfied [[ID=6!5]] PSCCH (i)+P PSSCH-1 (i) = w1 * P PSSCH-2 (i). w1 can have a value greater than 1. [[ID=7!2]]

[0168] Method 1-2) The sidelink transmit power depends on the transmit power of K1 symbols.

[0169] It seems there are some potential issues with the original text where some tags might be misformatted (e.g., the "!45" and "!5" in the translation). Please double-check the original text for accuracy.- Method 1-2 is the same as Method 1-1 in that the UE temporarily calculates P using Equation 7 PSCCH and P PSSCH-1 However, unlike method 1-1, in method 1-2, P mentioned in equation 7 may not be calculated. PSSCH-2 Therefore, the transmit power at the i-th sidelink transmission time can be determined as shown in Equation 10.

[0170] P Sidelink (i)=min{Pcmax(i),P PSCCH (i)+P PSSCH-1 (i)}...Equation 10

[0171] When the sizes of the frequency blocks in the K1 symbols and the K2 symbols are different, or due to different values ​​of the transmission power control parameters, the transmission power values ​​of the K1 symbols and the K2 symbols are also different. As mentioned above, P PSSCH-2 (i) It can be scaled up or down.

[0172] Method 1-3) The sidelink transmission power depends on the transmission power of K2 symbols.

[0173] -In methods 1-3, the transmit power of the i-th sidelink transmission time can be determined by Equation 11.

[0174] P Sidelink (i)=min{Pcmax(i),P PSSCH-2 (i)}...Equation 11

[0175] In Equation 11, P PSSCH-2 (i) can be equal to P shown in Equation 7 PSSCH-2 (i) The UE can use P obtained by Equation 11 PSSCH-2 (i) is used to calculate the transmission power of PSCCH and PSSCH transmitted in the portion of K1 symbols. More specifically, the P obtained by Equation 11 is PSSCH-2 (i) and P shown in Equation 7 PSCCH (i) and P PSSCH-1 (i), the temporary transmission power of the PSCCH and PSSCH in the K1 symbol part can be calculated, and the values ​​of X1, X2 and Y can be calculated as shown in Equation 12.

[0176] X1=10^[P PSCCH (i) / 10],X2=10^[P PSSCH-1 (i) / 10],Y=10^[P Sidelink (i) / 10]

[0177] ...Equation 12

[0178] By using the values ​​of X1, X2, and Y obtained by Equation 12, the UE can determine the transmit power of the PSCCH and PSSCH transmitted in the section of K1 symbols through Equation 13.

[0179] P PSCCH (i) = 10log10[X1*Y / (X1+X2)]

[0180] P PSSCH-1 (i) = 10log10[X2*Y / (X1+X2)]...Equation 13

[0181] Method 2) is used to determine P PSCCH and P PSSCH The parameters are set to be the same.

[0182] In the case of method 2, since the parameters for determining the transmit power of PSCCH and PSSCH are set to be the same, the parameters of PSCCH and PSSCH shown in Equations 3, 4, 5, and 7 may be the same. More specifically, at the i-th side link transmission time, P may be indicated. 0_PSCCH =P 0_PSSCH =P0,α PSCCH =α PSSCH =α, and Δ PSCCH =Δ PSSCH =Δ. Another prerequisite for method 2 is P PSCCH and P PSSCH There can be a fixed power density offset or a set power density offset. Under these assumptions, Method 2 can have two methods described below.

[0183] Method 2-1) The sidelink transmission power depends on the transmission power of K1 symbols.

[0184] In the portion of K1 symbols where PSCCH and PSSCH are frequency-divided and transmitted at the i-th sidelink transmission time, P can be determined by Equation 14. PSCCH and P PSSCH-1 .

[0185] P PSCCH (i)=γ1+P0+αPL(q)+β+Δ(i)[dBm]

[0186] P PSSCH-1 (i)=γ2+P0+αPL(q)+β+Δ(i)[dBm]…Equation 14

[0187] In Equation 14, γ1 and γ2 may be equal to the definition in Equation 6. In Equation 14, β may indicate 10log10[(M-N1)+10^(ε / 10)x N1][dB]. By using Equation 14, the transmit power of the i-th side link transmission time may be calculated as shown in Equation 10. In Method 2-1, when the sizes of the frequency blocks in K1 symbols and K2 symbols are different, P PSCCH (i)+P PSSCH-1 The value of (i) can be different from P PSSCH-2 (i). In this case, as mentioned above, P PSSCH-2 (i) It can be scaled up or down.

[0188] Method 2-2) The sidelink transmission power depends on the transmission power of K2 symbols.

[0189] Unlike method 2-1, in the part of K2 symbols where PSCCH and PSSCH are not frequency-divided at the i-th side link transmission time, the side link transmission power can be determined by equation 11. The P determined by equation 11 can be allocated by equations 12 and 13. Sidelink (i) Meanwhile, regarding the transmit power parameters used in Equations 7, 8, 9, 10, and 11, the transmitting UE can Figures 8 to 11The method mentioned in uses a value set by the base station or a value preset for the UE. For example, a UE outside the coverage of the base station may not receive settings for the transmit power parameter from the base station. Therefore, these UEs can use the preset value for the parameter. The set value may include 0, 0dB, or 0dBm. The preset value may indicate a value entered into the UE at the factory, or may indicate a value set by the base station when the UE was once within the coverage of the base station (the UE is now outside the coverage of the base station). In another example, even if the UE is within the coverage of the base station, when a unicast UE pair for performing unicast communication is not formed (for example, when the PC5 RRC configuration is not completed), or before a UE group for performing multicast communication is formed, parameter exchange between UEs to perform unicast / multicast communication may not be performed. Therefore, the transmitting UE for unicast and multicast communication may not set a transmit power value. To this end, for the mentioned parameters, a preset value may be used, or a value sent from the base station through the base station's RRC configuration and system information may be used. The parameter value used at this time may be different from the parameter value used after the PC5 RRC configuration. The PL(q) used by the transmitting UE before PC5 RRC configuration in Equations 7, 8, 9, 10, and 11 can indicate a path loss value for the Uu link between the base station and the transmitting UE, rather than a side link path loss value. In addition, when the UE uses preset parameters, each parameter can include a value of 0, 0 dB, or 0 dBm. In another example, the preset transmit power values ​​of PSCCH, PSSCH, and PSFCH, or the transmit power values ​​set by the base station, can be expressed as a transmit power value and an offset value relative to one channel. For example, when the transmit power values ​​of PSCCH, PSSCH, and PSFCH are preset, the transmit power value of PSCCH can be set to [X] dBm, and based on the transmit power value of PSCCH, the offset value of the transmit power of PSSCH and PSFCH can be set to + / - [Y] dB (or dBm). This can also apply even when the base station sets the transmit power values ​​of PSCCH, PSSCH, and PSFCH.

[0190] Figure 12 The V2X frame structure according to an embodiment of the present disclosure is shown.

[0191] refer to Figure 12 , similar to Figure 8 and Figure 9 , which shows that PSCCH and PSSCH are time-division multiplexed, but different from Figure 8 , shows that PSCCH and PSSCH are composed of different numbers of resource blocks on the frequency axis. That is, on the frequency axis, PSCCH can be composed of M frequency blocks, and PSSCH can be composed of N1 frequency blocks (M>N1). At the same time, similar to Figure 8And Figure 9 , on the time axis, the PSCCH can be composed of K1 symbols, and the PSSCH can be composed of K2 symbols. The values of K1 and K2 can be equal to or different from each other. In addition, when the values of K1 and K2 are different from each other, these values can be K1>K2 or K1<K2. The V2X transmitting UE can send sidelink control information (SCI) including the time / frequency allocation information of the PSSCH through the PSCCH. The V2X receiving UE can receive and decode the PSCCH, and then can obtain the time / frequency allocation information of the PSSCH and decode the PSSCH. Figure 12 Shows a PSSCH composed of K2 symbols, which is physically continuously located after the PSCCH composed of K1 symbols, although they may not be physically continuously located (i.e., the PSSCH can be logically continuously located, rather than physically continuously located after the PSCCH). In addition, although Figure 12 is not shown, the PSFCH can exist in the sidelink resource composed of K symbols. The PSCCH can be composed of K1 symbols, the PSSCH can be composed of K2 symbols and guard symbols, the PSFCH can be composed of K3 symbols, and K1 + K2 + the number of guard symbols + K3 can be equal to or less than K. The guard symbols can be one or at least two OFDM symbols. Additionally, on the frequency axis of the PSFCH, the size of the resource block can be equal to or different from the size of the resource blocks of the PSCCH and the PSSCH. The V2X receiving UE can decode the PSSCH, and then send a PSFCH including the result (i.e., ACK / NACK information) to the V2X transmitting UE.

[0192] At the i-th transmission time, the V2X UE using the Figure 10 sidelink resource structure can determine each of the transmission power (P PSCCH ) of the PSCCH and the transmission power (P PSSCH ) of the PSSCH through Equation 15.

[0193] P PSCCH (i) = min{Pcmax(i), P 0_PSCCH + α PSCCH* PL(q) + 10log10(M * 2 μ ) + Δ PSCCH}(i)} [dBm]

[0194] P PSSCH (i) = min{Pcmax(i), P 0_PSSCH + α PSSCH* PL(q) + 10log10(N1 * 2 μ ) + Δ PSSCH}(i)} [dBm]... Equation 15

[0195] In Equation 15, each parameter can be interpreted as Figure 9 The same as Equation 4 described above.

[0196] In addition, regarding the transmit power parameter used in Equation 15, the transmitting UE can Figures 8 to 12 The method mentioned in uses a value set by the base station or a value preset for the UE. For example, a UE that is outside the coverage of the base station may not receive the transmit power parameter set by the base station. Therefore, these UEs can use the value preset for the parameter. The set value may include 0, 0dB, or 0dBm. The preset value may indicate a value input into the UE at the factory, or may indicate a value set by the base station when the UE was once within the coverage of the base station (the UE is now outside the coverage of the base station).

[0197] In another example, even if the UE is within the coverage of the base station, when no UE pairing is formed for performing unicast communication (for example, before completing the PC5 RRC configuration), or before forming a UE group for performing multicast communication, parameter exchange between UEs to perform unicast / multicast communication may not be performed. The sending UE for unicast and multicast communication may not set the side link transmit power value based on the side link path loss estimate. To this end, for the above parameters, the UE may use a preset value or a value sent from the base station through the RRC configuration and system information of the base station. The parameter value used at this time may be different from the parameter value used after the PC5RRC configuration. The PL(q) used by the sending UE before the PC5 RRC configuration in Equations 7, 8, 9, 10, and 11 may indicate a path loss value for the Uu link between the base station and the sending UE, rather than a side link path loss value. In addition, when the UE uses preset parameters, each parameter may include a value of 0, 0dB, or 0dBm.

[0198] In another example, the preset transmit power values ​​of PSCCH, PSSCH, and PSFCH or the transmit power values ​​set by the base station can be expressed as a transmit power value and an offset value relative to one channel. For example, when the transmit power values ​​of PSCCH, PSSCH, and PSFCH are preset, the transmit power value of PSCCH can be set to [X]dBm, and based on the transmit power value of PSCCH, the offset values ​​of the transmit power of PSSCH and PSFCH can be set to + / -[Y]dB (or dBm). This also applies even if the transmit power values ​​of PSCCH, PSSCH, and PSFCH are set by the base station.

[0199] Figure 13 A method for multiplexing side link channels within side link resources according to an embodiment of the present disclosure is shown.

[0200] Reference Figure 13 , as Figure 11 shown, it shows that the PSCCH and PSSCH are frequency-division multiplexed in K1 symbols, and only the PSSCH is transmitted in K2 symbols, but different from Figure 11 , it shows that there is a PSFCH composed of K3 symbols. The value of K3 can be 1 or an integer greater than 1 (e.g., 2 or 3). That is, the K symbols can be composed of K1 PSCCH / PSSCH symbols multiplexed by frequency division, K2 PSSCH symbols, K3 PSFCH symbols, and guard symbols (gap symbols). The values of K1 and K2 can be equal to or different from each other. In addition, when the values of K1 and K2 are different from each other, these values can be K1>K2 or K1<K2. K1 + K2 + the number of guard symbols 1 + K3 + the number of guard symbols 2 can be equal to or less than K, and the guard symbols 1 and the guard symbols 2 can be one or at least two OFDM symbols. The guard symbols 1 and the guard symbols 2 can be OFDM symbols with different lengths. For example, the guard symbol 1 can be composed of two OFDM symbols, and the guard symbol 2 can be composed of one OFDM symbol. Additionally, in Figure 13 , M is shown as the size of the resource block on the frequency axis of the PSFCH, but the size of the resource block of the PSFCH can be equal to or different from the size of the resource blocks of the PSCCH and PSSCH. The V2X receiving UE can decode the PSSCH and then send a PSFCH including the result (i.e., ACK / NACK information) to the V2X sending UE.

[0201] Refer to Figure 13 , the V2X sending UE can send sidelink control information (SCI) through the PSCCH composed of K1 symbols on the time axis and N2 frequency blocks on the frequency axis. The sidelink control information can include the time / frequency allocation information of the PSSCH composed of K1 + K2 symbols on the time axis and M frequency blocks on the frequency axis and then be sent. The V2X receiving UE can receive and decode the PSCCH from the sending UE, and then can obtain the time / frequency allocation information of the PSSCH and decode the PSSCH. Figure 13 It shows the PSSCH composed of K2 symbols, which is physically continuously located after the PSCCH composed of K1 symbols, although they may not be physically continuously located (i.e., the PSSCH can be logically continuously located, rather than physically continuously located after the PSCCH).

[0202] Meanwhile, as Figure 11 shown, in Figure 13In the example, PSCCH can be composed of N1 frequency blocks on the frequency axis. PSSCH can be composed of N2 frequency blocks during K1 symbol lengths, and can be composed of M frequency blocks during K2 symbol lengths (N1+N2=M). At the i-th transmission time, use Figure 13 The V2X transmitting UE of the side link resource structure can determine the transmit power (P PSCCH ) and the transmit power of PSSCH (P PSSCH ).

[0203] P PSCCH (i)=X1+min{Pcmax(i),10log10(X2*2 μ )+P 0_PSCCH +α PSCCH* PL(q)}[dBm]...Equation 16

[0204] P PSCCH (i)=X1+min{Pcmax(i),10log10(X2*2 μ )+P 0_PSCCH +α PSCCH* PL(q),P Congestion}[dBm]...Equation 17

[0205] P PSCCH (i)=X1+min{Pcmax(i),10log10(X2*2 μ )+P 0_PSCCH +α PSCCH* PL(q),P Congestion ,P Range}[dBm]...Equation 18

[0206] Each parameter of Equation 16, Equation 17, and Equation 18 may indicate the following.

[0207] -Pcmax(i): Pcmax(i) indicates the maximum UE transmit output at the i-th side link transmission time and the P-max value set by the base station through system information or RRC (when there is no base station, it is a preset value), and can be determined by the UE through the UE power level contained in the UE.

[0208] -P 0_PSCCH :P 0_PSCCH It can indicate a value set by the base station through system information or RRC for ensuring the link quality of the receiving UE (when there is no base station, it is a preset value).

[0209] -α PSCCH :α PSCCHis a parameter for compensating the path loss value, has a value between 0 and 1, and may indicate a value set by the base station through system information or RRC (when there is no base station, it is a preset value). PSCCH =1, 100% of the path loss can be compensated. PSCCH =0.8, only 80% of the path loss can be compensated.

[0210] -X1: X1 indication

[0211]

[0212] , and M PSCCH and M PSSCH The size of the frequency block allocated to transmitting PSCCH and PSSCH can be indicated respectively. In addition, ε is a parameter for power boosting of PSCCH. For example, when PSCCH performs power boosting to keep its PSD 3dB higher than PSSCH, ε can be 3. When PSCCH and PSSCH maintain the same PSD (or when power boosting is not performed), ε can be 0. A fixed value can be used as the value of ε (i.e., ε is fixed to 3), or the value of ε can be set by the RRC and system information of the base station. When there is no base station, the value of ε can be preset. For example, in the case of setting the value of ε, when a unicast connection is configured, the V2X transmitting UE and the receiving UE can receive the value of ε set by PC-5RRC.

[0213] -X2: X2 indication

[0214]

[0215] , and M PSCCH 、M PSSCH and ε can be the same as described above for X1.

[0216] -2μ: 2μ can be a parameter for compensating for power spectral density (PSD), which varies according to the subcarrier spacing. For example, the case of using a subcarrier spacing of 15 kHz can indicate μ=0. Even if the same number of frequency blocks is used, when the subcarrier spacing is doubled to 30 kHz, the PSD can be reduced by half compared to the case of using a subcarrier spacing of 15 kHz. Therefore, in order to compensate for the PSD, the power is required to be doubled. More specifically, for example, when two frequency blocks are used, 10log10(2x20)=3dB is required for a subcarrier spacing of 15 kHz, and in order to maintain the same PSD as the subcarrier spacing of 15 kHz, the transmission power needs to be increased to 10log10(2x21)=6dB for a subcarrier spacing of 30 kHz.

[0217] -PL: PL may indicate an estimated path loss value. The path loss value may be estimated by Equation 2.

[0218] -P Congestion : P included in Equation 17 and Equation 18 Congestion is a parameter reflecting the congestion level of the V2X transmitting UE and can indicate the maximum transmit power that the V2X transmitting UE can use according to the congestion level. More specifically, when the base station determines that the congestion level is high in the resource pool configured by it, the base station can send P to the V2X transmitting UE through system information and RRC configuration. Congestion In another example, when a unicast link connection is configured via PC-5RRC, the V2X transmitting UE may receive P Congestion In another example, the V2X transmitting UE may use the P included in the preconfigured resource pool information. Congestion Value. Congestion The unit of the value is [dBm], and the range is -41 [dBm] to 31 [dBm] with an interval of 1 [dBm]. Congestion The value of can be associated with the priority of the PSSCH sent by the V2X transmitting UE. That is, when the priority of the PSSCH sent by the V2X transmitting UE is high, even if the congestion level is high, P Congestion The setting value of may also be high (e.g., 31 [dBm]) because the transmission of the PSCCH and the corresponding PSSCH should be successfully performed. On the other hand, when the priority of the PSSCH transmitted by the V2X transmitting UE is low and the congestion level is high, since the failure of the transmission of the PSCCH and the corresponding PSSCH does not cause a problem (or the transmission can be abandoned), P Congestion The setting value of can be low (for example, -41[dBm]). Congestion The value of may include a value of -∞. Since the value indicates -∞ in dBm, when the value is converted to a linear domain, the value may be 10^(-∞ / 10)=10^(-∞)=1 / (10^∞)≈0[mW]. In Equation 17, when P Congestion =-∞, this value can indicate P PSCCH (i) = X1 + P Congestion =P Congestion =-∞[dBm] As described above, it may indicate that the transmit power of the PSCCH is 0[mW] (ie, the PSCCH is not transmitted) in the linear domain.

[0219] The resource pool information of the PSCCH can be configured from the base station or PC-5 RRC, or can be pre-configured. In the configured (or pre-configured) resource pool, there may be a V2X resource allocation mode in which the V2X transmitting UE selects resources for transmitting the PSCCH through a sensing process. The sensing process may indicate a process of decoding the side link control information (SCI) transmitted through the PSCCH and a process of measuring the RSRP of the DMRS of the PSSCH associated with the PSCCH. The mode in which the V2X transmitting UE selects resources through the sensing process may be referred to as Mode 2. The V2X transmitting UE operating in Mode-2 may perform decoding of the PSCCH to select PSCCH resources that can be occupied within the configured (or pre-configured) PSCCH resource pool or PSCCH resource region. In addition, the V2X transmitting UE may measure the congestion level of the PSCCH transmitted in each time slot from the PSCCH resource pool or PSCCH resource region. Similarly, a V2X transmitting UE operating in Mode-2 may decode the PSCCH to select a PSSCH resource that can be occupied within a configured (or pre-configured) PSSCH resource pool or PSSCH resource region, and may measure the RSRP of the DMRS transmitted via the PSSCH. Furthermore, the V2X transmitting UE may measure the congestion level of the PSSCH transmitted in each time slot within the PSSCH resource pool or PSSCH resource region.

[0220] In the above-mentioned mode-2, the congestion level of PSCCH or PSSCH can be measured by the ratio (B / A) between the total number of resources constituting the PSCCH resource pool (or PSCCH resource area) or the PSSCH resource pool (or PSSCH resource area) and the number of resources occupied by other UEs. That is, when measuring the congestion level of PSCCH, A can be the total number of PSCCH resources constituting the PSCCH resource pool, and when measuring the congestion level of PSSCH, A can be the total number of PSSCH resources constituting the PSSCH resource pool. When measuring the congestion level of PSCCH, B can be calculated by comparing the value of the received signal strength indicator (RSSI) of the PSCCH symbol with the critical value of RSSI, which is set (or preset) by the base station or PC-5RRC. For example, assuming that the PSCCH sent by each UE in the PSCCH resource pool consists of x symbols, the total received power of each symbol (x total received powers) is obtained to obtain the average value of x symbols. Therefore, the RSSI of the PSCCH sent by each UE can be measured. The V2X transmitting UE can compare the RSSI measurement value with the RSSI critical value set (or preset) by the base station or PC-5RRC, so that when the RSSI measurement value is greater than the RSSI set critical value, it can be determined that the corresponding PSCCH is occupied by other UEs. Therefore, the corresponding PSCCH can be included in B. At the same time, when measuring the congestion level of the PSSCH, B can be calculated by comparing the RSSI value of the PSSCH symbol with the RSSI critical value set (or preset) by the base station or PC-5RRC.

[0221] The measurement of the congestion level can be calculated during a specific time period. For example, A and B can be measured for the PSCCH resources (or PSSCH resources) present in the time period of [nK, n-1] time slots of the configured PSCCH resource pool (or PSSCH resource pool). Therefore, the congestion level measured in n time slots can indicate the congestion level measured for the PSCCH resources (or PSSCH resources) present in the time period of [nK, n-1] time slots. A fixed value (or preset value) can be used as K, or K can also be set by the base station or PC-5RRC.

[0222] In Equation 17 and Equation 18, when the i-th PSCCH is transmitted, for P set from the base station or PC-5RRC Congestion The congestion level reflected in the value of , it is necessary to define the congestion measurement time for obtaining the congestion level. For example, the base station or PC-5RRC can use the congestion level result measured before k1 time slots or k2 symbols before the i-th PSCCH transmission of the V2X transmitting UE. That is, the P value used for the transmission power calculation of the PSCCH transmitted in the i-th time slot isCongestion The congestion level reflected in the value of may indicate the congestion level measured in the i-k1th time slot or the congestion level measured k2 symbols before the first symbol of the PSCCH transmitted in the i-th time slot. As described above, the congestion level measured in the i-k1 time slot may indicate the congestion level measured for the PSCCH resources existing in the [i-k1-K, i-k1-1] time period. In addition, the congestion level measured in the i-k2 symbol may indicate the congestion level measured for the PSCCH resources existing in the [i-k2-K, i-k2-1] time period.

[0223] Equation 16 can be applied to a mode (Mode-1) in which the base station schedules the transmission resources of the V2X transmission UE by using downlink control information (DCI) transmitted through the PDCCH. In another example, when P of Equation 17 is not set from the base station or PC-5RRC, Congestion Equation 16 can be applied when P is not set from the base station or PC-5RRC. Range Value and P Congestion When , Equation 16 can be applied.

[0224] When setting P from base station or PC-5RRC Congestion When the value is set from the base station or PC-5RRC, Equation 17 can be applied. Range and P Congestion When the value of , Equation 18 can be applied. P can be omitted in Equation 18 Congestion In this case, when the base station or PC-5RRC sets the P Range When the value of , Equation 18 can be applied.

[0225] -P Range : P in Equation 18 Range The transmit power value that satisfies the range requirement in V2X communication may be indicated. More specifically, the range requirement or range information may indicate the minimum distance that guarantees the QoS (e.g., delay time, reliability, data transmission rate, etc.) of the side link data packet sent via unicast or multicast communication. In unicast or multicast V2X communication, the transmitting UE may receive information about the range transmitted from its upper layer (e.g., the application layer). The range information may be expressed as a distance with a unit of meter (m), or may be expressed as an index. That is, the application layer may provide the range information to the application layer in units of meters (e.g., 100m). In another example, the application layer may provide the range index to the AS layer. In this case, the minimum distance may be mapped to each range index (i.e., index 1 = 100m, index 2 = 200m, etc.). Once the range information is received, the AS layer may generate a P mapped to the corresponding range information. RangeFor example, a P value corresponding to a range of 100m (or range index 1) may be generated. Range value and P corresponding to the 200m range (or range index 2) Range In another example, when receiving the distance information transmitted from the application layer, the AS layer can transmit the corresponding information to the RRC and generate P in the RRC. Range value.

[0226] At the same time, reference Figure 3 , the V2X UE can be configured as to whether to perform sidelink transmission power by using the downlink path loss with the base station or whether to perform sidelink transmission power by using the sidelink path loss between the V2X UEs. This information can be configured by configuring a path loss estimation signal that can be used by the V2X transmitting UE or the V2X receiving UE. More specifically, as Figure 3 As described above, when the sidelink transmission power should be performed by using the downlink path loss with the base station, the base station can configure the V2X transmitting UE and the V2X receiving UE so that the path loss is estimated by using the downlink synchronization signal block (SSB) or CSI-RS (that is, the SSB or CSI-RS is configured as a path loss estimation signal). When the sidelink transmission power is performed by using the sidelink path loss between V2X UEs, the base station can configure the V2X transmitting UE and the V2X receiving UE so that the path loss is estimated by using a sidelink reference signal (for example, a sidelink CSI-RS transmitted through the PSSCH or a DMRS transmitted through the PSSCH) (that is, the sidelink CSI-RS or DMRS is configured as a path loss estimation signal).

[0227] The sidelink resource pool information may include information about whether the mentioned downlink path loss value is applied to the sidelink transmit power, whether the uplink path loss value is applied to the sidelink transmit power, or whether any path loss estimation signal having the same meaning as the above is used. For example, the base station may send information about the sidelink resource pool to the UE through system information or RRC configuration, and the information about the sidelink resource pool may include setting parameters of the sidelink transmit power, which may be used in the corresponding resource pool. The parameters of the transmit power may include the parameters about P mentioned in Equations 16, 17, and 18. 0_PSCCH , α PSCCHand at least one piece of information of PL(q). More specifically, PL(0) may indicate that downlink path loss is applied, and may indicate that the downlink path loss is estimated by using SSB (q=0). PL(1) may indicate that downlink path loss is applied, and may indicate that the downlink path loss is estimated by using downlink CSI-RS (q=1). In addition, PL(2) may indicate that sidelink path loss is applied, and may indicate that the sidelink path loss is estimated by using sidelink CSI-RS or sidelink DMRS (q=2). In another example, the use of SSB, CSI-RS, sidelink CSI-RS, or sidelink DMRS for resource pool information may be explicitly written through system information or RRC configuration.

[0228] In another example, when there is no base station, the V2X transmitting UE can receive the setting parameters of the sidelink transmit power from the pre-configured resource pool information. In this case, the V2X UE can obtain the above transmit power parameters from the pre-configured resource pool information.

[0229] In another example, regardless of whether a base station exists, when a unicast connection with a V2X receiving UE is configured, the V2X transmitting UE may perform PC-5 RRC configuration. When the sidelink transmit power parameter is set via PC-5 RRC (in the case where the sidelink resource pool information does not include the sidelink transmit power parameter), or when information about the sidelink resource pool is configured via PC-5 RRC (in the case where the sidelink resource pool information includes the sidelink transmit power parameter), the sidelink transmit power parameter may be set.

[0230] In Equation 16, Equation 17, and Equation 18, when the downlink path loss is applied or when the sidelink path loss is applied, P 0_PSCCH and α PSCCH Can be set to different values. That is, when the UE applies the downlink path loss, P 0_PSCCH and α PSCCH Can be set to A1 and B1 respectively. When the UE applies the side link path loss, P 0_PSCCH and α PSCCH They can be set to A2 and B2, respectively. In scenarios where the sidelink and Uu link (i.e., downlink and uplink) share frequency, sidelink transmit power control can be performed to reduce interference caused by sidelink transmissions in the uplink signal received by the base station, so the downlink path loss value can be applied. In contrast, in scenarios where the sidelink and Uu link do not share frequency, since sidelink quality is guaranteed and unnecessarily high transmit power is not used, the sidelink path loss value can be applied to reduce power consumption.

[0231] At the same time, unlike the above example, the V2X UE can receive all the sidelink transmit power parameters when the downlink path loss value is applied and the sidelink transmit power parameters when the sidelink path loss value is applied. That is, the V2X UE can receive all of the following from the base station through system information or RRC, or through the UE's PC-5RRC: the P that can be used when the downlink path loss value is applied 0_PSCCH and α PSCCH , and the type of path loss estimation signal (SSB or downlink CSI-RS) used to estimate the downlink path loss; and P that can be used when applying the side link path loss value 0_PSCCH and α PSCCH , and the type of the side link path loss estimation signal (side link CSI-RS or side link DMRS) used to estimate the side link path loss.

[0232] As mentioned above, the resource pool information may include side link transmission power parameter information, including P 0_PSCCH and α PSCCH , and the type of path loss estimation signal used to estimate the path loss. More specifically, all of the following can be configured in the resource pool information (i.e., SSB or downlink CSI-RS and sidelink CSI-RS or sidelink DMRS are configured): P that can be used when applying the downlink path loss value 0_PSCCH_DL and α PSCCH_DL , and the type of path loss estimation signal used to estimate the downlink path loss; and P that can be used when applying the side link path loss value 0_PSSCH_SL and α PSSCH_SL , and the type of the side link path loss estimation signal used to estimate the side link path loss.

[0233] In another example, the path loss index set in the resource pool information may indicate the type of path loss estimation signal used to estimate the path loss (for example, when q=0 indicates SSB, q=1 indicates downlink CSI-RS, and q=2 indicates sidelink CSI-RS or sidelink DMRS, q=0 and q=2 or q=1 and q=2 are both set).

[0234] When the V2X UE receives all the sidelink transmit power parameters when the downlink path loss value is applied and the sidelink transmit power parameters when the sidelink path loss value is applied, the V2X UE may calculate the PSCCH transmit power through Equation 19 or Equation 20.

[0235] P PSCCH (i)=X1+min{Pcmax(i),10log10(X2*2 μ)+min{P1,P2}}[dBm]...Equation 19

[0236] P PSCCH (i)=X1+min{Pcmax(i),min{P3,P4}}[dBm]...Equation 20

[0237] Each parameter of Equation 19 and Equation 20 may indicate the following.

[0238] -Pcmax(i)X1,X2 and 2 μ Same as described in Equation 16.

[0239] -P1: P1 indicates the transmit power when the downlink path loss value is applied, which can be P1 = P 0_PSCCH_DL +α PSCCH_DL* PL(q). The index q representing the path loss can be omitted from P1.

[0240] -P2: P2 indicates the transmit power when the link path loss value is applied, which can be P2 = P 0_PSCCH_SL +α PSCCH_SL* PL(q). The index q representing the path loss can be omitted from P2.

[0241] -P3: P3 indicates the transmit power when the downlink path loss value is applied, which can be P3 = P1 + 10log10 (X2*2 μ ). The index q representing the path loss can be omitted from P3.

[0242] -P4: P4 indicates the transmit power when the link path loss value is applied, which can be P4 = P2 + 10log10 (X2 * 2 μ ). The index q representing the path loss can be omitted from P4.

[0243] Although not shown in Equations 19 and 20, as shown in Equations 17 and 18, P may be included in Equations 19 and 20. Congestion and P Range . More specifically, Equation 19 can be expressed as Equation 21.

[0244] P PSCCH (i)=X1+min{Pcmax(i),P Congestion ,P Range ,10log10(X2*2 μ )+min{P1,P2}}[dBm]...Equation 21

[0245] Equation 21 shows that P Congestion and P Rangeare included, but P can be omitted from Equation 21 Congestion and P Range one of the.

[0246] Similarly, Equation 20 can be expressed as Equation 22.

[0247] P PSCCH (i)=X1+min{Pcmax(i),P Congestion ,P Range ,min{P3,P4}}[dBm]...Equation 22

[0248] Equation 22 shows that P Congestion and P Range are included, but as shown in Equation 21, P Congestion and P Range One of can be omitted from Equation 22.

[0249] Equations 16, 17, 18, 19, 20, 21, and 22 are equations for determining the transmit power value of the PSCCH. Similarly, the transmit power value of the PSSCH can be calculated, but the transmit power of the PSSCH can be calculated in two parts. The first part corresponds to Figure 13 The transmit power of the PSSCH in K1 symbols in the period during which the PSCCH and PSSCH are frequency-division multiplexed can be indicated. It can be defined as P PSSCH-1 (i). The second part corresponds to Figure 13 The transmit power of the PSSCH in the K2 symbols in the period can indicate the PSCCH transmit power in the symbol during which the PSCCH is not frequency-division multiplexed. It can be defined as P PSSCH-2 (i). P PSSCH-1 (i) can be defined by changing X1 defined in each of Equations 16, 17, 18, 19, 20, 21, and 22 to X1-ε. Taking Equation 21 as an example, when Equation 21 is used for PSCCH transmit power, P can be calculated as shown in Equation 23. PSSCH-1 (i).

[0250] P PSSCH-1 (i)=X1-ε+min{Pcmax(i),P Congestion ,P Range ,10log10(X2*2 μ )+min{P1,P2}}[dBm]…Equation 23

[0251] The parameters defined in Equation 23 may be the same as those described in Equation 21. When Equation 16, Equation 17, Equation 18, Equation 19, Equation 20, or Equation 22 is used to calculate the PSSCH transmit power value, X1 defined in each equation is changed to X1-ε, so that the equation for calculating P can be derived. PSSCH-1 (i). In addition, in order to calculate P by modifying Equation 23 PSSCH-1 (i), Equation 22 can be used to apply P PSSCH-1 (i)=X1-ε+min{Pcmax(i),P Congestion ,P Range ,min{P3,P4}}[dBm].

[0252] The composition has been described Figure 13 Based on this, the transmit power value (P) for calculating the second part of the PSSCH can be defined by considering the following: PSSCH-2 (i)) of Eq.

[0253] like Figure 13 As shown, when the number of symbols used by a single V2X transmitting UE to transmit the i-th PSCCH and PSSCH is K1+K2, each symbol constituting the K1+K2 symbols should have the same transmit power. When the transmit power of each symbol is not the same, inefficient use of resources may occur because a protection portion (or gap) for power transients is required between symbols where the transmit power changes. In addition, when the transmit power level between symbols changes, the reception performance of the corresponding symbols on the receiving side may be reduced due to the phase change between symbols. Therefore, the transmit power of the K1 symbols where PSCCH and PSSCH are frequency-division multiplexed and the transmit power of the K2 symbols where only PSSCH is transmitted should remain equal. To this end, the transmit power value (P PSSCH-2 (i)).

[0254] P PSSCH-2 (i) = P PSCCH (i)+P PSSCH-1 (i) [dBm]…Equation 24

[0255] The parameters of Equation 24 are the same as those mentioned in Equations 16, 17, 18, 19, 20, 21, 22, and 23. In Equation 24, P PSCCH (i) and P PSSCH-1 Each of (i) can be less than the value of Pcmax(i), which is the maximum transmit power of the UE (i.e., P PSCCH(i) < Pcmax(i) and P PSSCH-1 (i) < Pcmax(i), but P PSSCH-2 (i) is P PSCCH (i) and P PSSCH-1 (i) is the sum of P PSSCH-2 (i), which can be greater than Pcmax(i). In this case, P

[0256] P' PSSCH-2 (i) = min{Pcmax(i), P PSSCH-2 (i)} [dBm]... Equation 25

[0257] P' PSSCH-2 (i) = δ · P PSSCH-2 (i) [dBm]... Equation 26

[0258] In Equation 26, δ is a scaling factor that can be greater than 0 and less than or equal to 1. To satisfy P PSSCH-2 (i) ≤ Pcmax(i), the value of δ can be set by the transmitting UE.

[0259] In the case where P' PSSCH-2 (i) = Pcmax(i) through Equation 25, as described above, it is proved that P PSCCH (i) + P PSSCH-1 (i) = P PSSCH-2 (i) > Pcmax(i). That is, since P PSSCH-2 (i) is limited by Pcmax(i) and the transmit power is thus changed, the transmit power of P PSCCH (i) + P PSSCH-1 (i) should be changed so that K1 symbols and K2 symbols can use the same transmit power. For this purpose, β · [P PSCCH (i) + P PSSCH-1 (i)] is used to scale down the sum of the transmit powers such that P PSCCH (i) + P PSSCH-1 (i) ≤ Pcmax(i). β is a scaling factor that can be greater than 0 and less than or equal to 1. In another example, as described in Equation​​​​​​​​​​​​​The updated transmit power values ​​of (i) are defined as P' PSCCH (i) and P' PSSCH-1 (i) They can be obtained by P' PSCCH (i) = 10log10[X1*Y / (X1+X2)] and P' PSSCH-1 (i) = 10log10 [X2 * Y / (X1 + X2)] (Equation 13). X1 and X2 are the same as those defined in Equation 12, and Y can indicate that Y = 10^ [P PSSCH-2 (i) / 10].

[0260] Similarly, when P PSSCH-2 The transmission power of (i) is changed to P' by equation 26 PSSCH-2 (i) When the transmission power is P PSCCH (i)+P PSSCH-1 The transmission power of (i) should be changed so that the K1 symbols and K2 symbols can use the same transmission power. To this end, as mentioned above, β·[P PSCCH (i)+P PSSCH-1 (i)] is used to scale down P PSCCH (i)+P PSSCH-1 (i) The sum of the transmission powers, or the changed P PSSCH-2 The transmission power value of (i) is P PSCCH (i) and P PSSCH-1 (i) The ratio between the transmission powers is redistributed, and P PSCCH (i) and P PSSCH-1 Each transmit power value of (i) can be updated accordingly.

[0261] The transmit power parameters used in Equations 16, 17, 18, 19, 20, 21, 22, 23, 24, and 26 may use values ​​set by the base station to the transmitting UE, or may use values ​​obtained by Figures 8 to 12 The method mentioned in the preceding text refers to a value preset in the UE. For example, a UE that is outside the coverage of a base station may not receive the set transmit power parameter from the base station. Therefore, these UEs can use the preset value for the parameter. The set value may include 0, 0dB, or 0dBm. The preset value may indicate a value input into the UE at the factory, or may indicate a value set by the base station when the UE was once within the coverage of the base station (the UE is now outside the coverage of the base station).

[0262] In another example, even if the UE is within the coverage of the base station, when a UE pairing for performing unicast communication is not formed (for example, before the PC5 RRC configuration is completed), or before a UE grouping for performing multicast communication is formed, parameter exchange between UEs to perform unicast / multicast communication may not be performed. The sending UE for unicast and multicast communication may not set the side link transmit power value based on the side link path loss estimation. To this end, for the above parameters, the UE may use a preset value or a value sent from the base station through the RRC configuration and system information of the base station. The parameter value used at this time may be different from the parameter value used after the PC5RRC configuration. The PL(q) used by the sending UE before the PC5RRC configuration may indicate a path loss value for the Uu link between the base station and the sending UE, rather than a side link path loss value. In addition, when the UE uses preset parameters, each parameter may include a value of 0, 0dB, or 0dBm.

[0263] In another example, the preset transmit power values ​​of PSCCH, PSSCH, and PSFCH or the transmit power values ​​set by the base station can be expressed as a transmit power value and an offset value relative to one channel. For example, when the transmit power values ​​of PSCCH, PSSCH, and PSFCH are preset, the transmit power value of PSCCH can be set to [X]dBm, and based on the transmit power value of PSCCH, the offset values ​​of the transmit power of PSSCH and PSFCH can be set to + / -[Y]dB (or dBm). This is also applicable even if the transmit power values ​​of PSCCH, PSSCH, and PSFCH are set by the base station.

[0264] Figure 14 An operation flow chart of a V2X UE for sidelink transmit power control according to an embodiment of the present disclosure is shown.

[0265] refer to Figure 14 , the V2X transmitting UE can determine whether the V2X transmitting UE exists in the coverage area of ​​the base station ( Figure 1A ) or V2X sends whether the UE is outside the coverage of the base station ( Figure 1C When determining whether a V2X transmitting UE is within the coverage of a base station, the UE may obtain information about a sidelink resource pool at operation 1401. For example, when the UE is determined to be within the coverage of a base station, the UE may obtain information about the sidelink resource pool through an RRC configuration or system information transmitted by the base station. Conversely, when the UE is determined to be outside the coverage of a base station, the UE may obtain information about the sidelink resource pool through system information preconfigured in the UE.

[0266] When obtaining information about a resource pool or obtaining information about a preconfigured resource pool from a base station, the UE may obtain information about a sidelink transmit power parameter included in the sidelink resource pool information at operation 1402. The sidelink transmit power parameter included in the sidelink resource pool information may include at least one of the following parameters.

[0267] -P0: Parameter used to ensure the link quality of the receiving UE

[0268] -α: α is a parameter used to guarantee the path loss value, and its value is between 0 and 1.

[0269] - Number of RBs: Parameters related to the frequency block size, which the UE can use to send sidelink control information and data information

[0270] - Subcarrier spacing: Parameters related to the subcarrier spacing used to transmit sidelink control information and data information

[0271] - Reference signal for path loss estimation. That is, the reference signal may indicate a synchronization signal transmitted via a downlink of a base station or a DMRS of a physical broadcast channel (PBCH) transmitted via a downlink of a base station, or may indicate a parameter indicating which sidelink reference signal transmitted via a sidelink between UEs to use for path loss estimation by the UE.

[0272] - Parameters regarding the multiplexing method of the sidelink control channel and the sidelink data channel (e.g., regarding whether the channels are multiplexed as Figure 8 、 Figure 9 and Figure 12 Information about whether the channel is divided and sent at the indicated time, or whether the channel is Figure 10 and Figure 11 The information shown is frequency divided and transmitted.

[0273] In operation 1403, the V2X transmitting UE sets the transmission power of the sidelink control channel and the sidelink data channel using the information about the parameter. In operation 1404, the V2X transmitting UE transmits the sidelink control channel and the sidelink data channel using the set transmission power value.

[0274] Figure 15 is a diagram showing a UE configuration according to an embodiment of the present disclosure.

[0275] refer to Figure 15 The UE according to the embodiment may include a transceiver 1520 and a controller 1510 configured to control the overall operation of the UE. The transceiver 1520 may include a transmitter 1521 and a receiver 1523.

[0276] The transceiver 1520 may transmit / receive signals to / from other network entities.

[0277] The controller 1510 can control the UE to perform an action of the above embodiment. At the same time, the controller 1510 and the transceiver 1520 do not need to be implemented as separate modules and can be implemented as a single component in the form of a single chip. In addition, the controller 1510 and the transceiver 1520 can be electrically connected to each other. For example, the controller 1510 can be a circuit, a dedicated circuit, or at least one processor. In addition, the operation of the UE can be implemented by providing a storage device storing corresponding program code to any component in the UE.

[0278] Figure 16 is a diagram showing a base station configuration according to an embodiment of the present disclosure.

[0279] refer to Figure 16 The base station according to the embodiment may include a transceiver 1620 and a controller 1610, and the controller 1610 is configured to control the overall operation of the base station. The transceiver 1620 may include a transmitter 1621 and a receiver 1623.

[0280] The transceiver 1620 may transmit / receive signals to / from other network entities.

[0281] The controller 1610 can control the base station to perform an action of the above embodiment. At the same time, the controller 1610 and the transceiver 1620 do not need to be implemented as separate modules and can be implemented as a single component in the form of a single chip. In addition, the controller 1610 and the transceiver 1620 can be electrically connected to each other. For example, the controller 1610 can be a circuit, a dedicated circuit, or at least one processor. In addition, the operation of the base station can be implemented by providing a storage device storing corresponding program code to any component in the base station.

[0282] It should be noted that Figures 1A to 1D 、 Figure 2A and Figure 2B 、 Figures 3 to 16 The configuration diagrams, example diagrams of control / data signal transmission methods, example diagrams of operation procedures, and configuration diagrams shown in the are not intended to limit the scope of the present disclosure. That is, Figures 1A to 1D 、 Figure 2A and Figure 2B 、 Figures 3 to 16 All elements, entities, or operations described in the present disclosure should not be construed as essential elements for implementing the present disclosure, and only some elements may be used to implement the present disclosure within the scope that does not impair the nature of the present disclosure.

[0283] The above operations of the base station or UE can be implemented by providing a storage device storing corresponding program code to any element in the base station or UE. In other words, the controller of the base station or UE can perform the above operations by reading and executing the program code stored in the storage device through a processor or central processing unit (CPU). The methods according to the embodiments of the present disclosure defined by the appended claims or disclosed herein can be implemented in hardware, software, or a combination of hardware and software.

[0284] When these methods are implemented by software, a computer-readable storage medium for storing one or more programs (software modules) may be provided. The one or more programs stored in the computer-readable storage medium may be configured to be executed by one or more processors in an electronic device. The at least one program may include instructions that cause the electronic device to perform the methods according to the various embodiments of the present disclosure as defined in the appended claims or disclosed herein.

[0285] Programs (software modules or software) can be stored in non-volatile memories, including random access memory and flash memory, read-only memory (ROM), electrically erasable programmable read-only memory (EEPROM), magnetic disk storage devices, compact disc-ROM (CD-ROM), digital versatile disk (DVD) or other types of optical storage devices or magnetic tapes. Alternatively, any combination of some or all of them can form a memory for storing programs. In addition, multiple such memories may be included in an electronic device.

[0286] In addition, the program can be stored in an attachable storage device that can access the electronic device through a communication network such as the Internet, an intranet, a local area network (LAN), a wide area network (WLAN), and a storage area network (SAN), or a combination thereof. Such a storage device can access the electronic device executing the embodiments of the present disclosure through an external port. In addition, an independent storage device on a communication network can access the electronic device executing the embodiments of the present disclosure.

[0287] In the above detailed embodiments of the present disclosure, the elements included in the present disclosure are expressed in the singular or plural, depending on the detailed embodiment presented. However, for ease of description, the singular or plural expression appropriate to the situation presented is selected, and the present disclosure is not limited to singular or plural elements. Elements expressed in plural form can be configured in singular form, or elements expressed in singular form can be configured in plural form.

[0288] While the present disclosure has been shown and described with reference to various embodiments thereof, it will be understood by those skilled in the art that various changes in form and details may be made without departing from the spirit and scope of the present disclosure as defined by the appended claims and their equivalents.

Claims

1. A method performed by a first user equipment (UE) in a wireless communication system, the method comprising: receiving a radio resource control (RRC) message including downlink path loss related information and sidelink path loss related information from a base station; Based on the equation P PSCCH (i) = X1 + min(Pcmax(i), P Congestion , min(P PSSCH,D (i), P PSSCH,SL (i)))[dBm], determines the sidelink transmit power; as well as Based on the determined sidelink transmit power, a physical sidelink control channel PSCCH is transmitted, Among them, X1 indicates , where M PSCCH and M PSSCH Indicates the frequency block size of the PSCCH and the frequency block size of the physical sidelink shared channel PSSCH respectively, ε is a parameter for the power boost of the PSCCH, Pcmax(i) is a value indicating the maximum UE transmit output power at the i-th transmission time configured by the base station through system information or RRC signaling, P Congestion Indicates the maximum transmission power that the vehicle can use to send V2X UE, P PSSCH,D (i) a first side link transmit power calculated based on the downlink path loss related information, P PSSCH,SL (i) A second side link transmit power calculated based on the side link path loss related information.

2. The method according to claim 1, further comprising: sending a sidelink reference signal to a second UE; as well as Reference signal received power (RSRP) information measured based on the sidelink reference signal is received from the second UE.

3. A method performed by a base station in a wireless communication system, the method comprising: sending a radio resource control (RRC) message including downlink path loss related information and sidelink path loss related information to a first user equipment (UE), wherein a physical sidelink control channel PSCCH is sent from the first UE, The PSCCH side link transmit power is based on the equation P PSCCH (i) = X1 + min(Pcmax,P Congestion , min(P PSSCH,D (i), P PSSCH,SL (i))) [dBm], Among them, X1 indicates , where M PSCCH and M PSSCH Indicates the frequency block size of the PSCCH and the frequency block size of the physical sidelink shared channel PSSCH respectively, ε is a parameter for the power boost of the PSCCH, Pcmax(i) is a value indicating the maximum UE transmit output power at the i-th transmission time configured by the base station through system information or RRC signaling, P Congestion Indicates the maximum transmission power that the vehicle can use to send V2X UE, P PSSCH,D (i) a first side link transmit power calculated based on the downlink path loss related information, P PSSCH,SL (i) A second side link transmit power calculated based on the side link path loss related information.

4. The method according to claim 3, wherein: A sidelink reference signal is transmitted from the first UE to a second UE, and reference signal received power (RSRP) information measured based on the sidelink reference signal is transmitted from the second UE to the first UE.

5. A first user equipment UE, comprising: a transceiver configured to transmit or receive at least one signal; as well as at least one processor coupled to the transceiver, Wherein, the at least one processor is configured to: receiving a radio resource control (RRC) message including downlink path loss related information and sidelink path loss related information from a base station, Based on the equation P PSCCH (i) = X1 + min(Pcmax, P Congestion , min(P PSSCH,D (i), P PSSCH,SL (i)))[dBm], determines the sidelink transmit power; and Based on the determined sidelink transmit power, a physical sidelink control channel PSCCH is transmitted, Among them, X1 indicates , where M PSCCH and M PSSCH Indicates the frequency block size of the PSCCH and the frequency block size of the physical sidelink shared channel PSSCH respectively, ε is a parameter for the power boost of the PSCCH, Pcmax(i) is a value indicating the maximum UE transmit output power at the i-th transmission time configured by the base station through system information or RRC signaling, P Congestion Indicates the maximum transmission power that the vehicle can use to send V2X UE, P PSSCH,D (i) a first side link transmit power calculated based on the downlink path loss related information, P PSSCH,SL (i) A second side link transmit power calculated based on the side link path loss related information.

6. The first UE according to claim 5, wherein The at least one processor is further configured to: sending a sidelink reference signal to the second UE, and Reference signal received power (RSRP) information measured based on the sidelink reference signal is received from the second UE.

7. A base station, comprising: a transceiver configured to transmit or receive at least one signal; as well as at least one processor coupled to the transceiver, Wherein, the at least one processor is configured to: sending a radio resource control (RRC) message including downlink path loss related information and sidelink path loss related information to a first user equipment (UE), wherein a physical sidelink control channel PSCCH is sent from the first UE, The PSCCH side link transmit power is based on the equation P PSCCH (i) = X1 + min(Pcmax,P Congestion , min(P PSSCH,D (i), P PSSCH,SL (i))) [dBm], Among them, X1 indicates , where M PSCCH and M PSSCH Indicates the frequency block size of the PSCCH and the frequency block size of the physical sidelink shared channel PSSCH respectively, ε is a parameter for the power boost of the PSCCH, Pcmax(i) is a value indicating the maximum UE transmit output power at the i-th transmission time configured by the base station through system information or RRC signaling, P Congestion Indicates the maximum transmission power that the vehicle can use to send V2X UE, P PSSCH,D (i) a first side link transmit power calculated based on the downlink path loss related information, P PSSCH,SL (i) A second side link transmit power calculated based on the side link path loss related information.

8. The base station according to claim 7, in, A sidelink reference signal is transmitted from the first UE to a second UE, and reference signal received power (RSRP) information measured based on the sidelink reference signal is transmitted from the second UE to the first UE.

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