Method and apparatus for allocating transmission power in wireless communication system

Abstract

The present disclosure provides a method and apparatus for allocating transmission power in a wireless communication system. The present disclosure relates to a communication technology for merging IoT technology with a 5G communication system supporting a higher data transmission rate than a 4G system, and a system therefor. The present disclosure may be applied to intelligent services based on the 5G communication technology and the IoT-related technology, such as smart home, smart building, smart city, smart car, Internet of Vehicles, health care, digital education, smart retail, security and safety services.

Description

[0001] This application is a divisional application of a patent application with an application date of January 7, 2020, an application number of 202080019827.0, and an invention title of "Method and Apparatus for Allocating Transmission Power in a Wireless Communication System". Technical Field

[0002] The present disclosure relates to a method for distributing and allocating transmission power in a wireless communication system, and more particularly, to a method and apparatus for a New Radio (NR) Vehicle-to-Everything (V2X) User Equipment (UE) that can communicate through one or more of an NR uplink, a Long-Term Evolution (LTE) uplink, an NR sidelink, and an LTE sidelink to distribute and allocate transmission power. Background Art

[0003] Since the deployment of 4G communication systems, efforts have been made to develop an improved 5G or pre-5G communication system to meet the demand for wireless data traffic. Therefore, 5G or pre-5G communication systems are also referred to as "beyond 4G networks" or "post-LTE systems".

[0004] The 5G communication system is considered to be implemented in a higher frequency (mmWave) band, such as the 60 GHz band, in order to achieve higher data rates. To reduce the propagation loss of radio waves and increase the transmission distance, beamforming, massive multiple-input multiple-output (MIMO), full-dimensional MIMO (FD-MIMO), array antennas, analog beamforming, and massive antenna technology have been discussed in the 5G communication system.

[0005] In addition, in the 5G communication system, system network improvements are being developed based on advanced small cells, cloud radio access network (RAN), ultra-dense networks, device-to-device (D2D) communication, wireless backhaul, mobile networks, cooperative communication, coordinated multi-point (CoMP), receiver interference cancellation, etc.

[0006] In the 5G system, hybrid FSK and QAM modulation (FQAM) and sliding window superimposed coding (SWSC) 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 have been developed.

[0007] The Internet is a human - centric network of connections where humans generate and consume information and is now evolving towards the Internet of Things (IoT), where distributed entities (e.g., things) exchange and process information without human intervention. The Internet of Everything (IoE) has emerged, which is formed by the connection of IoT technologies and big data processing technologies with cloud servers. With the requirements of technical elements such as "sensing technology", "wired / wireless communication and network infrastructure", "service interface technology", and "security technology" in IoT implementation, recently, sensor networks, machine - to - machine (M2M) communication, machine - type communication (MTC), etc. have been studied. Such an IoT environment can provide intelligent Internet technology services, creating new value for human life by collecting and analyzing the data generated between connected things. IoT can be applied to various fields, including smart homes, smart buildings, smart cities, smart cars or connected vehicles, smart grids, healthcare, smart appliances, and advanced medical services, through the integration and combination of existing information technology (IT) and various industrial applications.

[0008] In response to this, various attempts have been made to apply 5G communication systems to IoT networks. For example, technologies such as sensor networks, machine - type communication (MTC), and machine - to - machine (M2M) communication can be achieved through beamforming, MIMO, and array antennas. Cloud radio access network (RAN), as an application of the above - mentioned big data processing technology, can also be considered an example of the integration between 5G technology and IoT technology.

[0009] Since various services can be provided with the progress of the above - mentioned mobile communication systems, an effective method for providing these services is needed. Summary of the Invention

[0010] Technical Problem The present disclosure relates to a method for allocating and distributing transmission power when a NR V2X UE performs communication through one or more links.

[0011] Technical Solution The technical objectives to be achieved in the embodiments of the present disclosure are not limited to the above - mentioned technical objectives, and other unmentioned technical objectives will be clearly understood by those of ordinary skill in the art to which the present disclosure pertains from the following description.

[0012] In the disclosure for solving the above problems, a method for a user equipment (UE) in a wireless communication system includes: detecting a first sidelink transmission using a first radio access technology (RAT) and a second sidelink transmission using a second RAT; determining whether the first sidelink transmission and the second sidelink transmission overlap; in the case where the first sidelink transmission and the second sidelink transmission overlap, determining the sidelink to be transmitted; and transmitting sidelink information on the determined sidelink.

[0013] In some examples, determining the sidelink to be transmitted is determined based on the priority information included in the sidelink control information (SCI).

[0014] In some examples, transmitting the sidelink information is the sidelink information with a high priority included in the transmission priority information.

[0015] In some examples, the first RAT is the fourth generation (4G), and the second RAT is the fifth generation (5G).

[0016] In some examples, in the case where the first sidelink transmission and the second sidelink transmission overlap, determining the sidelink to be transmitted is determined based on the priority information indicated by the higher layer.

[0017] In some examples, transmitting the sidelink information is the sidelink synchronization signal with a high priority included in the transmission priority information.

[0018] In some examples, transmitting the sidelink information is determined based on the priority information predetermined according to the type of the physical layer channel, and the sidelink with a high priority is transmitted.

[0019] In some examples, the first sidelink transmission using the first RAT and the second sidelink transmission using the second RAT are determined based on the capabilities of the UE.

[0020] In another example of the present disclosure, a UE includes: a transceiver capable of transmitting and receiving at least one signal; and a controller coupled to the transceiver, wherein the controller is configured to: detect a first sidelink transmission using a first radio access technology (RAT) and a second sidelink transmission using a second RAT; determine whether the first sidelink transmission and the second sidelink transmission overlap; in the case where the first sidelink transmission and the second sidelink transmission overlap, determine the sidelink to be transmitted; and transmit the sidelink information in the determined sidelink.

[0021] Technical effects According to the proposed embodiment, when the V2X UE performs communication through one or more links, the transmission power of the UE is effectively allocated and distributed, thereby achieving smooth communication. Description of the drawings

[0022] Figure 1a is an example of a system for describing an embodiment of the present disclosure.

[0023] Figure 1b is another example of a system for describing an embodiment of the present disclosure.

[0024] Figure 1cIt is another example of a system for describing an embodiment of the present disclosure.

[0025] Figure 1d It is another example of a system for describing an embodiment of the present disclosure.

[0026] Figure 2a It is an example of a V2X communication method performed via a sidelink.

[0027] Figure 2b It is another example of a V2X communication method performed via a sidelink.

[0028] Figure 3 It is an example of a framework structure of V2X communication according to an embodiment of the present disclosure.

[0029] Figure 4 It is a diagram showing an example of a link through which an NR V2X UE can perform V2X communication.

[0030] Figure 5a It is an example of the transmission power allocation of a V2X UE according to an embodiment of the present disclosure.

[0031] Figure 5b It is another example of the transmission power allocation of a V2X UE according to an embodiment of the present disclosure.

[0032] Figure 6a It is another example of the transmission power allocation of a V2X UE according to an embodiment of the present disclosure.

[0033] Figure 6b It is another example of the transmission power allocation of a V2X UE according to an embodiment of the present disclosure.

[0034] Figure 7 It is a diagram showing the structure of a UE according to an embodiment of the present disclosure.

[0035] Figure 8 It is a diagram showing the structure of a base station according to an embodiment of the present disclosure. Detailed implementation manners

[0036] Hereinafter, embodiments of the present disclosure will be described in detail with reference to the accompanying drawings.

[0037] In the description of the embodiments of the present disclosure, descriptions of technical details that are well known in the art and have no direct relation to the present disclosure may be omitted. This is to more clearly convey the gist of the present disclosure by omitting unnecessary descriptions without causing ambiguity.

[0038] Similarly, in the drawings, some elements are exaggerated, omitted, or only briefly outlined. Additionally, the dimensions of each element do not necessarily reflect actual dimensions. The same reference numerals are used throughout the drawings to refer to the same or corresponding parts.

[0039] From the following detailed description of the embodiments in conjunction with the drawings, the advantages and features of the present disclosure and the methods for achieving these advantages and features can be seen. However, the present disclosure is not limited to the embodiments disclosed below, but can be implemented in various different ways. The embodiments are provided only to complete the present disclosure and fully inform those skilled in the art related to the present disclosure of the scope of the present disclosure, and the present disclosure is only defined by the scope of the claims. The same reference numerals are used throughout the specification to refer to the same parts.

[0040] At the same time, it can be understood that the blocks of the flowchart and combinations of the flowchart can be executed by computer program instructions. These computer program instructions can be loaded onto the processor of a general-purpose computer, a special-purpose computer, or a programmable data processing device, and the instructions executed by the processor of the computer or the programmable data processing device create a method for performing the functions described in the blocks of the flowchart. In order to implement the functions in a certain way, the computer program instructions can also be stored in a computer-usable or readable memory suitable for a special-purpose computer or a programmable data processing device, and the computer program instructions stored in the computer-usable or readable memory can produce a manufactured article containing means for performing the functions described in each block of the flowchart. Since the computer program instructions can be loaded onto a computer or a programmable data processing device, when the computer program instructions are executed as a process having a series of operations on the computer or the programmable data processing device, they can provide steps for performing the functions described in the blocks of the flowchart.

[0041] In addition, each block of the flowchart can correspond to a module, segment, or code containing one or more executable instructions for performing one or more logical functions, or a part thereof. It should also be noted that in some alternative cases, the functions described by the blocks can be executed in an order different from the listed order. For example, two blocks listed in sequence can be executed substantially simultaneously, or in the reverse order according to the corresponding functions.

[0042] Herein, the "unit", "module", etc. used in this embodiment may refer to a software component or a hardware component, such as an FPGA or an ASIC capable of performing a certain function or operation. However, the "unit", etc. are not limited to hardware or software. The unit, etc. can be configured to reside in an addressable storage medium or drive one or more processors. For example, the unit, etc. may refer to components such as software components, object-oriented software components, class components or task components, processes, functions, attributes, programs, subroutines, program code segments, drivers, firmware, microcode, circuits, data, databases, data structures, tables, arrays, or variables. The functions provided by the components and units can be a combination of smaller components and units, and it can be combined with other components and units to form larger components and units. In addition, the components and units can implement driving one or more processors in a device or a secure multimedia card. In addition, in one embodiment, the unit, etc. may include one or more processors.

[0043] When describing the embodiments of the present disclosure in detail, the focus is mainly on the radio access network (New RAN (NR)) and the packet core (5G system, 5G core network, or Next Generation Core (NG Core)), which are the core networks of the 5G mobile communication standard specified by 3GPP (the mobile communication standardization organization). However, those skilled in the art should understand that the subject matter of the present disclosure is applicable to other communication systems with similar technical backgrounds without significant modifications departing from the scope of the present disclosure.

[0044] In the 5G system, in order to support network automation, a network data collection and analysis function (NWDAF) can be defined, which is a network function that provides the function of analyzing and providing data collected from the 5G network. The NWDAF can collect / store / analyze information from the 5G network and provide the results to unspecified network functions (NFs), and the analysis results can be independently used by each NF.

[0045] Below, for ease of description, some terms and names defined in the 3GPP (3rd Generation Partnership Project) Long Term Evolution (LTE) standard (the standard for 5G, NR, LTE, or similar systems) may be used. However, the present disclosure is not limited by these terms and names and can equally apply to systems that conform to other standards.

[0046] In addition, in the following description, for ease of description, terms for identifying access nodes, terms for referring to network entities, terms for referring to messages, terms for referring to interfaces between network entities, and terms for referring to various identification information are given. Therefore, the present disclosure is not limited to the terms used and other terms referring to entities with equivalent technical meanings can also be used.

[0047] Since the commercialization of 4G communication systems, efforts have been made to develop improved 5G communication systems (NR, New Radio) to meet the growing demand for wireless data traffic. To achieve high data rates, 5G communication systems have been designed to support extremely high frequency (mmWave) bands (e.g., 28 GHz band). To reduce the path loss of radio waves and increase the transmission distance of radio waves in the millimeter wave band, various technologies including beamforming, massive multiple-input multiple-output (massive MIMO), full-dimensional MIMO (FD-MIMO), array antennas, analog beamforming, and massive antennas have been considered for 5G communication systems. In addition, different from LTE, 5G communication systems support various subcarrier spacings, e.g., 15 kHz, 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, not only DFT-S-OFDM, but also CP-OFDM is used as the waveform for uplink transmission. Although LTE supports HARQ (Hybrid ARQ) retransmission in units of transport blocks (TBs), 5G can additionally support HARQ retransmission based on code block groups (CBGs) in which several code blocks (CBs) are bundled.

[0048] In addition, to improve the system network in 5G communication systems, technology development related to evolved small cells, advanced small cells, cloud radio access network (cloud RAN), ultra-dense network, device-to-device (D2D) communication, wireless backhaul, vehicle communication network (vehicle-to-everything (V2X) network), cooperative communication, coordinated multi-point (CoMP) communication, interference cancellation, etc. is underway.

[0049] Meanwhile, the Internet is evolving from a human-centric network where humans create and consume information to the Internet of Things (IoT), e.g., where distributed elements of things exchange and process information. The Internet of Everything (IoE) technology has also emerged, combining IoT technology with big data processing technology through connection to cloud servers. To realize the IoT, technical elements related to sensing, wired / wireless communication and network infrastructure, service interfaces, and security are required, and in recent years, IoT technologies such as sensor networks, machine-to-machine (M2M) or machine-type communication (MTC) have been studied. In the IoT environment, intelligent Internet technology services can be provided to collect and analyze data generated by interconnected things, adding new value to human life. Through the integration and combination of existing information technology and various industries, IoT technology can be applied to various fields, e.g., smart home, smart building, smart city, smart car or connected car, smart grid, healthcare, smart consumer electronics, and advanced medical services.

[0050] Therefore, various attempts are being made to apply the 5G communication system to IoT networks. For example, technologies such as sensor networks and machine-to-machine (M2M) or machine type communication (MTC) are being realized by using 5G communication technologies, including beamforming, MIMO, and array antennas. Cloud RAN, as an application of the above big data processing technology, may be an example of the integration of 3G technology and IoT technology. In this way, multiple services can be provided to users in a communication system. To provide such multiple services to users, a method capable of providing a single service according to its characteristics within the same time interval and a device using this method are required. Currently, various services provided in the 5G communication system are being studied, and one of them is a service that meets the requirements of low latency and high reliability.

[0051] In terms of vehicle communication, the standardization of LTE-based V2X using the device-to-device (D2D) communication structure has been completed in 3GPP Rel-14 and Rel-15, and efforts are currently being made to develop 5G new radio (NR)-based V2X. The NR V2X is planned to support unicast communication, multicast (or broadcast) communication, and broadcast communication between UEs. In addition, different from LTE V2X which aims to send and receive the basic safety information required for vehicles to drive on the road, NR V2X aims to provide more advanced services, such as queuing, advanced driving, extended sensors, and remote driving.

[0052] The NR V2X UE can perform uplink transmission to the NR base station or the LTE base station and can perform V2X communication with another NR V2X UE or LTE V2X UE. As an example, the NR V2X UE can perform single transmission or simultaneous transmission as follows.

[0053] - The case of performing single transmission using one of the NR uplink, LTE uplink, NR sidelink, and LTE sidelink - The case of performing synchronous transmission using two links Simultaneous transmission of NR uplink and NR sidelink Simultaneous transmission of NR uplink and LTE sidelink Simultaneous transmission of NR uplink and LTE uplink Simultaneous transmission of NR sidelink and LTE uplink Simultaneous transmission of NR sidelink and LTE sidelink Simultaneous transmission of LTE sidelink and LTE Uu - The case of performing synchronous transmission using three links Simultaneous transmission of NR sidelink, LTE sidelink, and NR uplink Simultaneous transmission of NR sidelink, LTE sidelink, and LTE uplink Simultaneous transmission of NR sidelink, NR uplink, and LTE uplink Simultaneous transmission of NR uplink, LTE sidelink, and LTE uplink - Case of performing synchronous transmission using four links Simultaneous transmission of NR uplink, NR sidelink, LTE uplink, and LTE sidelink Which of the above scenarios can be supported can be determined according to the capabilities of the NR V2X UE.

[0054] NR V2X UEs that can only transmit through a single link may need rules on which link to use for transmission among the above four links. In addition, since NR V2X UEs that can transmit simultaneously through two or more links have restrictions on their transmission power, they may have to appropriately distribute and allocate the transmission power so that the transmission power does not exceed their maximum transmission power.

[0055] Embodiments of this specification are presented to support the above scenarios and are intended to provide a method and apparatus for allocating and distributing transmission power for an NR V2X UE.

[0056] Figure 1a , Figure 1b , Figure 1c and Figure 1d are examples of systems for describing embodiments of the present disclosure.

[0057] Figure 1a Illustrates the case where all V2X UEs (UE-1 and UE-2) are within the coverage area of the base station.

[0058] All V2X UEs can receive data and control information from the base station 103 through the downlink (DL), or send data and control information to the base station 103 through the uplink (UL). Here, the data and control information can be the data and control information for V2X communication. Alternatively, the data and control information can be the data and control information for conventional cellular communication. In addition, V2X UEs can send and receive data and control information for V2X communication through the sidelink (SL).

[0059] Figure 1bIt shows a situation where UE-1 101 in the V2X UE is within the coverage area of base station 103 while UE-2 102 is outside the coverage area of base station 103. Figure 1b The illustration can be called an example of partial coverage.

[0060] UE-1 101 within the coverage area of base station 103 can receive data and control information from base station 103 via the downlink (DL), or can send data and control information to base station 103 via the uplink (UL).

[0061] UE-2 102 outside the coverage area of base station 103 cannot receive data and control information from base station 103 via the downlink, nor can it send data and control information to base station 103 via the uplink.

[0062] UE-2 102 can send and receive data and control information of V2X communication to / from UE-1 101 via the sidelink.

[0063] Figure 1c It shows a situation where all V2X UEs are outside the coverage area of the base station.

[0064] Therefore, UE-1 101 and UE-2 102 cannot receive data and control information from the base station via the downlink and cannot send data and control information to the base station via the uplink.

[0065] UE-1 101 and UE-2 102 can send and receive data and control information of V2X communication via the sidelink.

[0066] Figure 1d It shows a scenario where UEs in different cells perform V2X communication. Specifically, Figure 1d It shows a situation where the V2X transmitting UE and the V2X receiving UE are connected to different base stations (RRC connected state) or camped on them (RRC connection released state, i.e., RRC idle state). Here, UE-1 101 can be the V2X transmitting UE and UE-2 102 can be the V2X receiving UE. Or, UE-1 101 can be the V2X receiving UE and UE-2 102 can be the V2X transmitting UE. UE-1 101 can receive V2X-specific system information blocks (SIBs) from the base station 103 to which it is connected (or on which it camps), and UE-2 102 can receive V2X-specific SIBs from another base station 104 to which it is connected (or on which it camps). Here, the information of the V2X-specific SIBs received by UE-1 101 and the information of the V2X-specific SIBs received by UE-2 102 may be different from each other. Therefore, in order for UEs in different cells to perform V2X communication, it is necessary to standardize the information.

[0067] For ease of description, Figure 1a 、 Figure 1b 、 Figure 1c and Figure 1d illustrates, but is not limited to, a V2X system consisting of two UEs (UE-1 and UE-2). In addition, the uplink and downlink between the base station and the V2X UE can be referred to as the Uu interface, while the sidelink between V2X UEs can be referred to as the PC5 interface. Therefore, these can be used interchangeably in this disclosure.

[0068] Meanwhile, in this disclosure, UE 101 or 102 can refer to a vehicle supporting vehicle-to-vehicle (V2V) communication, a vehicle supporting vehicle-to-pedestrian (V2P) communication or a pedestrian mobile phone (i.e., a smart phone), a vehicle supporting vehicle-to-network (V2N) communication, or a vehicle supporting vehicle-to-infrastructure (V2I) communication. Additionally, in this disclosure, a UE can refer to a roadside unit (RSU) equipped with UE functions, an RSU equipped with base station functions, or an RSU equipped with a part of base station functions and a part of UE functions.

[0069] Furthermore, this disclosure predefines that the base station 103 can be a base station that supports both V2X communication and conventional cellular communication, or a base station that only supports V2X communication. Moreover, in this case, the base station can refer to a 5G base station (gNB), a 4G base station (eNB), or a road site unit (RSU). Therefore, unless otherwise specified in the disclosure, the base station and the RSU can be used interchangeably because they are used as the same concept.

[0070] Figure 2a and Figure 2b are examples of V2X communication methods performed via the sidelink.

[0071] As Figure 2a shown, the TX UE and the RX UE can perform communication in a one-to-one manner, which can be referred to as unicast communication.

[0072] As Figure 2b shown, the TX UE and the RX UE can perform communication in a one-to-many manner, which can be referred to as multicast or broadcast.

[0073] Figure 2b Describes the case where UE-1 201, UE-2 202, and UE-3 203 form a group (Group A) to perform multicast communication and UE-4 204, UE-5 205, UE-6 206, and UE-7 207 form another group (Group B) to perform multicast communication. Each UE only performs multicast communication within the group it belongs to, and no communication is performed between different groups. Figure 2b Illustrates the formation of two groups, but is not limited thereto.

[0074] Meanwhile, although not shown in Figure 2a and Figure 2b , V2X UEs can perform broadcast communication. Broadcast communication means a situation where all V2X UEs receive data and control information transmitted by a V2X transmitting UE via a sidelink. For example, in Figure 2b , it is assumed that UE-1 is the transmitting UE for broadcast, and all UEs (UE-2, UE-3, UE-4, UE-5, UE-6, UE-7) can receive the data and control information transmitted by UE-1 201.

[0075] Figure 3 is an example of the framework structure of V2X communication according to an embodiment of the present disclosure.

[0076] Figure 3 shows, but is not limited to, the system operating 1024 radio frames. For example, a specific system can operate fewer or more than 1024 radio frames, and the number of radio frames operated by the system can be configured for the UE by the base station using the master information block (MIB) transmitted through the physical broadcast channel (PBCH), or can be a fixed value pre-agreed with the UE. In Figure 3 , the radio frame number and the system frame number can be considered the same. That is, radio frame number '0' can correspond to system frame number '0', and radio frame number '1' can correspond to system frame number '1'. The length of a radio frame on the time axis is 10 milliseconds and can be composed of 10 subframes. That is, the length of a subframe on the time axis can be 1 millisecond. The subcarrier spacing available for NR V2X communication can be expressed as 15 kHz x 2n , where n is an integer with values of 0, 1, 2, 3,.... As Figure 3 shows, in NR V2X, the time slots that make up a subframe are 2 n , which can vary according to the subcarrier spacing. For example, when using a subcarrier spacing of 15 kHz, a subframe can be composed of one time slot (n = 0). In addition, when using subcarrier spacings of 30 kHz, 60 kHz, and 120 kHz, a subframe can be composed of 2 time slots (n = 1), 4 time slots (n = 2), and 8 time slots (n = 3), respectively. Although not shown in Figure 3 , regardless of the subcarrier spacing, a time slot can be composed of 14 orthogonal frequency division multiplexing (OFDM) symbols or discrete Fourier transform spread OFDM (DFT-S-OFDM) symbols. The above can be summarized in Table 1 below (physical layer parameters according to subcarrier spacing).

[0077] [Table 1]

[0078] Figure 4 Shows an example of a link through which an NR V2X UE can perform V2X communication.

[0079] Specifically, V2X communication can be performed through at least one of the following links.

[0080] - The link between NR V2X UE 401 and another NR V2X UE 405 can be referred to as an NR sidelink. The NR V2X UE 401 can send sidelink control information and data information of NR V2X communication to another NR V2X UE 405 through the NR sidelink. In addition, the NR V2X UE 401 can receive sidelink control information and data information of NR V2X communication from another NR V2X UE 405 through the NR sidelink.

[0081] - The link between NR V2X UE 401 and LTE V2X UE 404 can be referred to as an LTE sidelink. Here, it can be assumed that the NR V2X UE 401 has the ability to support LTE V2X communication. The NR V2X UE 401 can send and receive control information and data information of LTE V2X communication through the LTE sidelink.

[0082] - The downlink or uplink between NR V2X UE 401 and NR base station 403 (gNB) can be named NR Uu.

[0083] The NR V2X UE 401 can receive control information and data information related to NR sidelink transmission and reception from the NR base station 403 (gNB) through NR Uu. In addition, the NR V2X UE 401 can send the NR sidelink control information and data information received from another NR V2X UE 405 to the gNB 403 through NR Uu.

[0084] The NR V2X UE 401 can receive control information and data information related to LTE sidelink transmission and reception from the NR base station 403 (gNB) through NR Uu. In addition, the NR V2X UE 401 can send the LTE sidelink control information and data information received from the LTE V2X UE 404 to the gNB 403 through NR Uu. Here, it can be assumed that the NR V2X UE 401 has the ability to support LTE V2X communication.

[0085] - The downlink or uplink between the NR V2X UE 401 and the LTE base station 402 (eNB) can be named LTE Uu.

[0086] The NR V2X UE 401 can receive control information and data information related to NR sidelink transmission and reception from the LTE base station 402 (eNB) via LTE Uu. In addition, the NR V2X UE 401 can send the NR sidelink control information and data information received from another NR V2X UE 405 to the eNB 402 via LTE Uu. Here, it can be assumed that the NR V2X UE 401 has the ability to support LTE Uu.

[0087] The NR V2X UE 401 can receive control information and data information related to LTE sidelink transmission and reception from the eNB 402 via LTE Uu. In addition, the NR V2X UE 401 can send the LTE sidelink control information and data information received from the LTE V2X UE 404 to the eNB 402 via LTE Uu. Here, it can be assumed that the NR V2X UE 401 has the ability to support LTE V2X communication and also has the ability to support LTE Uu.

[0088] A specific NR V2X UE 401 can perform V2X communication and cellular communication by simultaneously using Figure 3 one or more of the links shown in. In particular, when the NR V2X UE performs communication using two or more links simultaneously, the following scenarios may exist.

[0089] - Scenario 1) The case of transmitting using two links simultaneously NR Uu + NR sidelink: The NR V2X UE 401 can send NR V2X control information and data information (or, can send uplink control information and data information for NR cellular communication) to the gNB 403 via NR Uu, and at the same time, can send the control information and data information of NR V2X communication to another NR V2X UE 405 via the NR sidelink.

[0090] NR Uu + LTE Sidelink: The NR V2X UE 401 can send NR V2X control information and data information to the gNB 403 via NR Uu (alternatively, it can send uplink control information and data information for NR cellular communication to the gNB 403), and at the same time, it can send control information and data information for LTE V2X communication to the LTE V2X UE 404 via the LTE sidelink.

[0091] NR Uu + LTE Uu: The NR V2X UE 401 can send NR V2X control information and data information to the gNB 403 via NR Uu (alternatively, it can send uplink control information and data information for NR cellular communication), and at the same time, it can send LTE V2X control information and data information to the eNB 402 via LTE Uu (alternatively, it can send uplink control information and data information for LTE cellular communication to the eNB 402). In this scenario, since NR V2X control information and data information are not sent via the NR sidelink, it cannot be regarded as an operation of the NR V2X UE. Since this disclosure is for identifying the operations of the NR V2X UE, this scenario can be excluded from this disclosure.

[0092] NR Sidelink + LTE Uu: The NR V2X UE 401 can send control information and data information for NR V2X communication to another NR V2X UE 405 via the NR sidelink, and at the same time, it can send NR V2X control information and data information to the gNB 403 via NR Uu (alternatively, it can send uplink control information and data information for NR cellular communication to the gNB 403).

[0093] NR Sidelink + LTE Sidelink: The NR V2X UE 401 can send control information and data information for NR V2X communication to another NR V2X UE 405 via the NR sidelink, and at the same time, it can send control information and data information for LTE V2X communication to the LTE V2X UE 404 via the LTE sidelink.

[0094] LTE Sidelink + LTE Uu: The NR V2X UE 401 can send the control information and data information of LTE V2X communication to the LTE V2X UE 404 via the LTE sidelink. Meanwhile, it can send the LTE V2X control information and data information (alternatively, the uplink control information and data information of LTE cellular communication) to the eNB 402 via the LTE Uu. In this scenario, since the control information and data information are not sent via the NR Uu or the NR sidelink, it cannot be regarded as the operation of the NR V2X UE (i.e., it can be regarded as the operation of the LTE V2X UE). Since this disclosure aims to identify the operations of the NR V2X UE, this scenario can be excluded from this disclosure.

[0095] - Scenario 2) The case of simultaneous transmission using three links NR Sidelink + LTE Sidelink + NR Uu: The NR V2X UE 401 can send the control information and data information of NR V2X communication and LTE V2X communication via the NR sidelink and the LTE sidelink respectively. Meanwhile, it can send the NR V2X control information or data information (alternatively, the uplink control information and data information of NR cellular communication) to the gNB 403 via the NR Uu.

[0096] NR Uu + NR Sidelink + LTE Uu: The NR V2X UE 401 can send the NR V2X control information and data information (alternatively, the uplink control information and data information of NR cellular communication) to the gNB 403 via the NR Uu, and can send the control information and data information of NR V2X communication to another NR V2X UE 405 via the NR sidelink. Meanwhile, the NR V2X UE 401 can send the LTE V2X control information and data information (alternatively, the uplink control information and data information of LTE cellular communication) to the eNB 402 via the LTE Uu.

[0097] NR Uu + LTE Sidelink + LTE Uu: The NR V2X UE 401 can send NR V2X control information or data information to the gNB 403 via NR Uu (alternatively, send uplink control information and data information of NR cellular communication to the gNB 403), and can send control information and data information of LTE V2X communication to the LTE V2X UE 404 via the LTE sidelink. Meanwhile, the NR V2X UE 401 can send LTE V2X control information or data information to the eNB 402 via LTE Uu (alternatively, can send uplink control information and data information of LTE cellular communication to the eNB 402).

[0098] NR Sidelink + LTE Sidelink + LTE Uu: The NR V2X UE 401 can send control information and data information of NR V2X communication and LTE V2X communication via the NR sidelink and the LTE sidelink respectively, and meanwhile, can send LTE V2X control information or data information to the eNB 402 via LTE Uu (alternatively, can send uplink control information and data information of LTE cellular communication to the eNB 402).

[0099] - Scenario 3) The case of simultaneous transmission using four links NR Uu + NR Sidelink + LTE Uu + LTE Sidelink: The NR V2X UE 401 can send NR V2X control information or data information to the gNB 403 via NR Uu (alternatively, send uplink control information and data information of NR cellular communication to the gNB 403), and can send control information and data information of NR V2X communication to another NR V2X UE 405 via the NR sidelink. Meanwhile, the NR V2X UE 401 can send LTE V2X control information or data information to the eNB 402 via LTE Uu (alternatively, send uplink control information and data information of LTE cellular communication to the eNB 402), and can send control information and data information of LTE V2X communication to the LTE V2X UE 404 via the LTE sidelink.

[0100] Although not mentioned in the above examples, Carrier Aggregation (CA) technology can be combined with each of the above scenarios. For example, the NR V2X UE 401 can use one or more NR Uu links to send NR control information and data information by using NR Uu CA. In addition, the NR V2X UE 401 can use one or more NR sidelink to send NR V2X control information and data information by using NR sidelink CA. Similarly, the NR V2X UE 401 can use one or more LTE Uu links to send LTE control information and data information by using LTE Uu CA. Moreover, the NR V2X UE can use one or more LTE sidelinks to send LTE V2X control information and data information by using LTE sidelink CA.

[0101] The NR V2X UE 401 may need to perform transmission on a single link or support at least one of the above scenarios according to its capabilities. Therefore, the NR V2X UE 401 that can only perform single-link transmission may need to allocate the transmission power only to a specific link. In addition, the NR V2X UE that can use two or more links for simultaneous transmission may need to allocate and distribute the transmission power to each link. There may be various methods of allocating and distributing the transmission power, and the methods mentioned in Figure 5a 、 Figure 5b 、 Figure 6a and Figure 6b may be applied.

[0102] Figure 5a and Figure 5b are examples of allocating the transmission power of the V2X UE according to embodiments of the present disclosure.

[0103] In Figure 5a and Figure 5b , P_NR can represent the maximum transmission power available for NR transmission, and P_LTE can represent the maximum transmission power available for LTE transmission. In addition, P1 can represent the transmission power actually used for NR transmission, and P2 can represent the transmission power actually used for LTE transmission. Here, since the actually used transmission power cannot be greater than the allowed maximum transmission power P1 ≤ P_NR and P2 ≤ P_LTE, so Figure 5a and Figure 5b P1 ≤ P_NR and P2 ≤ P_LTE should hold. In addition, Figure 5a and Figure 5b P_Total shown in is the maximum transmission power value allowed when the NR link and the LTE link perform simultaneous transmission. Here, P_NR, P_LTE, P1, P2, and P_Total have linear values not in units of dB or dBm.

[0104] Figure 5a shows a case where the sum of P_NR and P_LTE is less than P_Total, Figure 5b shows a case where the sum of P_NR and P_LTE is greater than P_Total. Figure 5a and Figure 5b does not show a case where the sum of P_NR and P_LTE is equal to P_Total, but it can be included in the Figure 5a category. In addition, Figure 5a shows P_NR = P_LTE, while Figure 5b shows P_NR > P_LTE. However, this is just an example, and the method described in the present disclosure can be applied even in a scenario where P_NR < P_LTE.

[0105] In Figure 5a and Figure 5b NR transmission can refer to the simultaneous transmission of NR Uu and NR side link, or the transmission through one of the links of NR Uu and NR side link. In addition, LTE transmission may refer to the simultaneous transmission of LTE Uu and LTE side link, or the transmission through one of the links of LTE Uu and LTE side link.

[0106] After completing the RRC connection with the base station (RRC connected mode), the NR V2X UE can configure information about P_NR_dBm, P_LTE_dBm, and P_Total_dBm through UE-specific RRC parameters (here, P_NR_dBm = 10 log10(P_NR), P_LTE_dBm = 10 log10(P_LTE), and P_Total_dBm = 10 log10(P_Total)). For example, when the V2X UE establishes an RRC connection with an NR base station (gNB), the V2X UE can receive the corresponding information from the gNB. When the V2X UE establishes an RRC connection with an LTE base station (eNB), the V2X UE can receive information about P_NR_dBm, P_LTE_dBm, and P_Total_dBm from the eNB. As another example, when the V2X UE establishes RRC connections with both the gNB and the eNB, it can receive information about P_NR_dBm, P_LTE_dBm, and P_Total_dBm from the master node. More specifically, the above cases can be regarded as dual connectivity (DC) scenarios. In an LTE-NR DC environment with the eNB as the master node, the eNB can configure the corresponding information as RRC parameters for the NR V2X UE. In addition, in an NR-LTE DC environment with the gNB as the master node, the gNB can configure the corresponding information as RRC parameters for the NR V2X UE.

[0107] On the other hand, P_NR_dBm, P_LTE_dBm, and P_Total_dBm can be configured from the base station (gNB or eNB) where the V2X UE is located through system information (system information block, SIB) instead of UE-specific RRC configuration. Here, the V2X UE may be in a state where RRC connection establishment is not performed with the base station where it is located (i.e., RRC idle state).

[0108] From the perspective of the base station, when there is an interface between the gNB and the eNB, the gNB and the eNB can negotiate and set the P_NR and P_LTE values through the interface. In this case, the sum of P_NR and P_LTE can be set to be less than or equal to P_Total. However, when there is no interface between the gNB and the eNB, the gNB and the eNB can independently set the P_NR and P_LTE values without negotiating on the P_NR, P_LTE, and P_Total values. Therefore, there may be a situation where the sum of P_NR and P_LTE is greater than P_Total (P_NR + P_LTE > P_Total) at a specific moment.

[0109] On the other hand, from the perspective of the NR V2X UE, when there is an interface between the NR modem and the LTE modem, the NR modem and the LTE modem can exchange information about P1 and P2. In this case, even if the base station performs configuration to make P_NR + P_LTE > P_Total hold in the above example, the NR V2X UE can adjust the transmit power values so that the sum of P1 and P2 is less than or equal to P_Total (P1 + P2 ≤ P_Total) by exchanging information about the transmit power values between the NR modem and the LTE modem. A UE with this ability can be identified as a UE capable of dynamic power allocation between NR and LTE. Conversely, when there is no interface between the NR modem and the LTE modem, the information about P1 and P2 cannot be exchanged. In this case, if the base station configures to make P_NR + P_LTE > P_Total hold in the above example, it may have to perform transmission using only one of the NR link and the LTE link. A UE with this ability can be identified as a UE capable of single uplink operation (SUO) between NR and LTE.

[0110] Next, the transmit power allocation operation will be described in detail according to the capabilities of the UE in the various scenario environments exemplified above.

[0111] - NR V2X UEs that do not have the ability to perform synchronous transmission via NR and LTE links cannot perform synchronous transmission via NR and LTE links. Therefore, such UEs can only use one of the NR and LTE links for transmission (SUO). In this case, one of the following methods can be applied to determine which link to use for transmission.

[0112] The NR V2X UE can perform transmission using only one link according to a preset rule. For example, the NR V2X UE can perform transmission only via the link of the base station with which it has established an RRC connection. That is, if the NR V2X UE has established an RRC connection with a gNB, it can set the transmission power to P1 and transmit via the NR link. If the NR V2X UE has established an RRC connection with an eNB, it can set the transmission power to P2 and transmit via the LTE link. If the NR V2X UE has established RRC connections with both a gNB and an eNB, it can only transmit via the link connected to the master node. For example, when the gNB is the master node, the NR V2X UE can set the transmission power to P1 and transmit via the NR link. When the eNB is the master node, the NR V2X UE can set the transmission power to P2 and transmit via the LTE link.

[0113] As another example, different from the above example, according to the priority of the physical channels transmitted via each link, the transmission via the link that has transmitted a channel with low priority can be abandoned, and transmission can be performed only via the link that has transmitted a channel with high priority. For example, the control channel may have a higher priority than the data channel. That is, when the control channel is transmitted via the NR link and the data channel is transmitted via the LTE link, transmission can only be performed via the NR link that has transmitted the control channel. On the other hand, there may be a case where the control channel is transmitted on both the NR and LTE links. In this case, the priorities preset for each channel can be followed. Specific examples in this regard will be described in detail later.

[0114] As another example, the NR V2X UE can perform transmission using only one link according to the priority provided by the base station through RRC configuration. More specifically, the gNB or eNB can configure a priority value for the NR V2X UE via RRC parameters according to the data types transmitted via the NR and LTE links. Based on the configured priority value, the NR V2X UE can abandon the transmission on the link that has transmitted low-priority data and can perform transmission only on the link that should transmit high-priority data.

[0115] An NR V2X UE capable of performing simultaneous transmission on NR and LTE links can perform the following operations according to the settings of the base station.

[0116] - When P_NR + P_LTE ≤ P_Total is set by the base station The NR V2X UE can perform synchronous transmission on the NR and LTE links by setting the transmission powers of the NR and LTE links to P1 and P2 respectively. Here, the base station can perform configuration such that P1 ≤ P_NR and P2 ≤ P_LTE hold.

[0117] - When P_NR + P_LTE > P_Total is set by the base station An NR V2X UE with dynamic power allocation capability can adjust the transmission power values so that P_NR + P_LTE ≤ P_Total holds, and can apply one of the following methods.

[0118] The NR V2X UE can adjust the transmission power values of the NR and LTE links simultaneously. More specifically, the transmission power value of the NR link can be decreased , and the transmission power value of the LTE link can be decreased . Here, should hold. w1 and w2 respectively refer to the scaling factors of the NR and LTE links, and can have values between 0 and 1. The NR V2X UE can adjust the transmission power values by determining the values of w1 and w2 that satisfy the conditions 0 ≤ w1 ≤ 1 and 0 ≤ w2 ≤ 1. As another example, the NR V2X UE can adjust the transmission power values by determining the values of w1 and w2 that satisfy the condition 0 ≤ w1 + w2 ≤ 1, where the value of w1 + w2 is between 0 and 1.

[0119] The NR V2X UE can decrease the transmission power value of the NR link without changing the transmission power value of the LTE link. This may imply a variation of the above example, where w2 is always set to 1. Here, w1 can have a value between 0 and 1. This scenario can be applicable to but not limited to when the NR V2X UE has established an RRC connection with the eNB (without establishing an RRC connection with the gNB) or when the eNB is configured as the master node (with RRC connections established with both the gNB and the eNB).

[0120] As another variation of the above example, w1 is always set to 1, while w2 can have a value between 0 and 1. This scenario can apply to, but is not limited to, when the NR V2X UE has established an RRC connection with the gNB (without establishing an RRC connection with the eNB) or when the gNB is configured as the master node (establishing RRC connections with both the gNB and the eNB).

[0121] As another example, according to the priority of the physical channels sent through each link, the case where a lower-priority channel has a lower transmission power value compared to a higher-priority channel can be considered. For example, assuming that the control channel has a higher priority than the data channel, the scaling factor for the control channel can be defined as α and the scaling factor for the data channel can be defined as β . Here, α and β can each have a value between 0 and 1, and the α value can always be less than the β value. Therefore, when the control channel is sent through the NR link and the data channel is sent through the LTE link, the transmission power value can be adjusted so that holds. Conversely, when the control channel is sent through the LTE link and the data channel is sent through the NR link, the transmission power value can be adjusted so that holds. On the other hand, there may be cases where both the NR link and the LTE link send the control channel or both send the data channel. In this case, the priority set for each channel in advance can be followed. A detailed example in this regard will be described later.

[0122] Meanwhile, for an NR V2X UE without dynamic power allocation capabilities, since information about transmission power allocation cannot be exchanged between the UE's NR modem and LTE modem, the transmission power value cannot be adjusted to make P_NR + P_LTE ≤ P_Total hold. Therefore, one of the above SUO methods can be applied to set the transmission power value.

[0123] In the above example, the method of allocating transmission power to the NR link and the LTE link has been described. However, the NR link can consist of NR Uu and NR side links, while the LTE link can consist of LTE Uu and LTE side links. Therefore, it may be necessary to reallocate the transmission power already allocated to the NR link and the LTE link to each Uu and side link in the NR link and the LTE link. One of the following methods can be considered as a method of transmission power reallocation.

[0124] [Method of Allocating Transmission Power to LTE Uu and LTE Side Links] The transmission power allocated to the LTE link can be reallocated to the LTE Uu and the LTE sidelink by adopting at least one of the following methods.

[0125] - Method 1: Allocate the transmission power according to a predetermined priority The transmission power can be allocated to the LTE Uu and the LTE sidelink according to a predetermined priority. In this case, the priority can be determined according to the types of the physical layer channels transmitted through the Uu and the sidelink. Additionally, it can be assumed at this time that the transmissions through the Uu and the sidelink are performed in the same cell or on the same component carrier (CC). For example, when the physical layer random access channel is transmitted through the Uu and at the same time the sidelink control information and data information are transmitted through the sidelink, the UE can abandon the sidelink transmission and perform the Uu link transmission (i.e., the transmission power allocated to the LTE link is allocated such that the transmission power of the sidelink is set to 0, and the remaining transmission power is used for the Uu transmission). Conversely, when a physical layer channel other than the random access channel (e.g., the physical layer uplink data channel or the physical layer uplink control channel) is transmitted through the Uu and at the same time the sidelink control information and data information are transmitted through the sidelink, the UE can abandon the Uu transmission and perform the sidelink transmission (i.e., the transmission power allocated to the LTE link is allocated such that the transmission power of the Uu is set to 0, and the remaining transmission power is used for the sidelink transmission).

[0126] As another example, the case where CA is applied to the sidelink can be considered. That is to say, it can refer to the case where the sidelink control information and data are transmitted through two or more carriers and the Uu transmission is performed simultaneously. In this case, the sidelink transmission can not be performed on the carrier on which the Uu transmission is performed. For example, it can refer to such a case that the Uu transmission is performed on component carrier 1 (CC#1) and the sidelink transmission is performed on component carrier 2 (CC#2) and component carrier 3 (CC#3). In this case, while maintaining the transmission power for the Uu transmission, the sidelink transmission power can be reduced such that the sum of the transmission power for the sidelink transmission and the transmission power for the Uu transmission is less than or equal to the maximum transmission power (Pcmax) of the UE. On the other hand, when the sidelink transmission is performed on the carrier on which the Uu transmission is performed, as in the case of performing the simultaneous transmission of the Uu and the sidelink in the same cell as described above, the transmission power can be allocated to the Uu or the sidelink according to the physical layer based on a preset priority.

[0127] - Method 2: Allocate the transmission power according to a configured priority The eNB can configure the priority threshold for the UE through the System Information (SIB) or UE-specific RRC configuration. Moreover, the UE can receive the priority value of the sidelink to be transmitted from a higher layer of the UE (e.g., the application layer). Here, it can be assumed that the Uu and sidelink transmissions are performed in the same cell or on the same component carrier. The UE can compare the priority threshold configured by the eNB with the priority value of the sidelink to be transmitted by the UE. When the priority value of the sidelink is less than the threshold configured by the eNB (the smaller value is given priority), the UE can abandon the Uu transmission and perform the sidelink transmission (i.e., the transmission power allocated to the LTE link is allocated such that the transmission power of the Uu is set to 0, and the remaining transmission power is used for the sidelink transmission). Conversely, when the priority value of the sidelink is greater than the threshold configured by the eNB, the UE can abandon the sidelink transmission and perform the Uu transmission (i.e., the transmission power allocated to the LTE link is allocated such that the transmission power of the sidelink is set to 0, and the remaining transmission power is used for the Uu transmission).

[0128] As another example, consider the case where CA is applied to the sidelink. That is, it may refer to the case where the sidelink transmission is performed through two or more carriers and the Uu transmission is performed simultaneously. In this case, the sidelink transmission may not be performed on the carrier on which the Uu transmission is performed. For example, it may refer to a case where the Uu transmission is performed on Component Carrier 1 (CC#1), and the sidelink transmission is performed on Component Carrier 2 (CC#2) and Component Carrier 3 (CC#3). In this case, when the priority value of the sidelink is less than the threshold configured by the eNB (the smaller value is given priority), the UE can adjust the transmission power for the Uu transmission while maintaining the transmission power for the sidelink transmission. Here, the Uu transmission power can be reduced such that the sum of the transmission power for the sidelink transmission and the transmission power for the Uu transmission is less than or equal to the maximum transmission power (Pcmax) of the UE. Conversely, when the priority value of the sidelink is greater than the threshold configured by the eNB, the UE can adjust the transmission power for the sidelink transmission while maintaining the transmission power for the Uu transmission. Here, the sidelink transmission power can be reduced such that the sum of the transmission power for the Uu transmission and the transmission power for the sidelink transmission is less than or equal to the maximum transmission power (Pcmax) of the UE. On the other hand, when the sidelink transmission is performed on the carrier through which the Uu transmission is performed, the transmission power allocation method can be applied as in the case where the Uu and sidelink transmissions are performed in the same cell or on the same component carrier as described above.

[0129] [Method for Allocating Transmission Power to NR Uu and NR Sidelink] The transmission power allocated to the NR link can be reallocated to the NR Uu and NR sidelink by adopting at least one of the following methods.

[0130] - Method 1: Allocate transmission power according to a predetermined priority - The transmission power can be allocated to NR Uu and NR side links according to a predetermined priority. More specifically, the transmission power of a channel with a low priority can be adjusted while maintaining the transmission power of a channel with a high priority. Here, the transmission power of the low-priority channel can be reduced so that the sum of the transmission power for Uu transmission and the transmission power for side-link transmission is less than or equal to the maximum transmission power (Pcmax) of the UE. There can be various ways to define the priority, and at least one of the following methods can be used.

[0131] When Uu and side-link transmissions are performed in the same cell or on the same component carrier, Uu transmission may always have a higher priority than side-link transmission. In this case, the V2X UE can set the side-link transmission power to 0 (abandon or discard side-link transmission) and perform Uu transmission (i.e., the transmission power allocated to the NR link is allocated so that the side-link transmission power is set to 0, and the remaining transmission power is used for Uu transmission). The above example can equally apply to the case where Uu and side-link transmissions are performed in different cells or on different component carriers.

[0132] The priority can be determined according to the type of physical layer channels transmitted through Uu and side links. For example, when the physical random access channel (PRACH) is transmitted through Uu and side-link transmission is performed simultaneously, the UE can abandon side-link transmission and perform Uu link transmission. This may mean that, regardless of the physical layer channels transmitted through the side link, the PRACH of Uu always has a high priority. The above example can apply to the case where Uu and side-link transmissions are performed in different cells (or on different component carriers) and the case where Uu and side-link transmissions are performed in the same cell.

[0133] As another example of determining priorities based on the types of physical layer channels transmitted via Uu and sidelink, the following scenario can be considered. Physical layer channels and signals transmitted via Uu can include a Physical Random Access Channel (PRACH), an Uplink Control Channel (Physical Uplink Control Channel, PUCCH), an Uplink Data Channel (Physical Uplink Shared Channel, PUSCH), and a sounding signal (Sounding Reference Signal, SRS). Physical layer channels and signals transmitted via sidelink can include a Sidelink Synchronization Channel (Sidelink Synchronization Signal Block, S-SSB), a Sidelink Control Channel (Physical Sidelink Control Channel, PSCCH), a Sidelink Data Channel (Physical Sidelink Shared Channel, PSSCH), a Sidelink Feedback Channel (Physical Sidelink Feedback Channel, PSFCH), and a Sidelink Reference Signal (Sidelink Channel State Information Reference Signal, S-CSI-RS). Priorities can be defined using one of the following methods according to various combinations of the above channels.

[0134] Example 1: Uu channels can have higher priorities than sidelink channels, and control channels in Uu or sidelink can have higher priorities than data channels. For example, PRACH > PUCCH with HARQ-ACK and / or SR (Scheduling Request) or PUSCH with HARQ-ACK > PSFCH with HARQ-ACK or PSSCH with HARQ-ACK > PUCCH with CSI or PUSCH with CSI > PSFCH with CSI or PSSCH with CSI > PUSCH > PSCCH > PSSCH > SRS > S-CSI-RS. In the above example, PSCCH and PSSCH can have the same priority. Additionally, in the above example, SRS and S-CSI-RS can have the same priority. The above example can be applied to the case where Uu and sidelink transmissions are performed in different cells (or, different CCs), as well as the case where Uu and sidelink transmissions are performed in the same cell (or, the same CC).

[0135] Example 2: The priority of the sidelink channel can be higher than that of the Uu channel, and the priority of the control channel in the sidelink or Uu can be higher than that of the data channel. For example, PSFCH with HARQ-ACK or PSSCH with HARQ-ACK > PRACH > PUCCH with HARQ-ACK and / or SR (scheduling request) or PUSCH with HARQ-ACK > PSFCH with CSI or PSSCH with CSI > PUCCH with CSI or PUSCH with CSI > PSCCH > PSSCH > PUSCH > S-CSI-RS > SRS. As another example, in the above example, PRACH can have the highest priority. That is, PRACH > PSFCH with HARQ-ACK or SSCH with HARQ-ACK > PUCCH with HARQ-ACK and / or SR (scheduling request) or PUSCH with HARQ-ACK > PSFCH with CSI or PSSCH with CSI > PUCCH with CSI or PUSCH with CSI > PSCCH > PSSCH > PUSCH > S-CSI-RS > SRS. In the above example, PSCCH and PSSCH can have the same priority. Additionally, in the above example, SRS and S-CSI-RS can have the same priority. The above examples can be applied to the case where Uu and sidelink transmissions are performed in different cells (or, different CCs), and the case where Uu and sidelink transmissions are performed in the same cell (or, the same CC).

[0136] - Method 2: Allocate the transmission power according to the configured priority The NR V2X UE may send sidelink control information (SCI) to control the transmission of PSSCH, PSFCH, or S-CSI-RS that it sends via the PSCCH. Here, the NR V2X UE may receive from a higher layer (e.g., the application layer) the priority information of the PSSCH, PSFCH, or S-CSI-RS transmission to be sent by it. The priority information may consist of N bits and may be included in the SCI. For example, if the priority information consists of 3 bits, 000 represents priority "0", and 111 represents priority "7", so it can be seen that there are a total of 8 levels of priority. Here, a smaller value may be given priority. The gNB may configure the priority thresholds for NR Uu and NR sidelink to the UE through system information (SIB) or UE-specific RRC configuration. The NR V2X UE may compare the priority threshold configured by the gNB with the priority value included in the above SCI field. When the priority value of the sidelink is less than the threshold configured by the gNB, the NR V2X UE may abandon the Uu transmission and perform sidelink transmission (i.e., the transmission power allocated to the NR link is allocated such that the transmission power of Uu is set to 0, and the remaining transmission power is used for sidelink transmission). Conversely, when the priority value of the sidelink is greater than the threshold configured by the eNB, the UE may abandon the sidelink transmission and perform Uu transmission (i.e., the transmission power allocated to the NR link is allocated such that the transmission power of the sidelink is set to 0, and the remaining transmission power is used for Uu transmission). This operation may be applied when CA is not applied to the sidelink, or when CA is applied to the sidelink but the cell (or CC) in which NR Uu is transmitted and the cell in which the sidelink is transmitted are the same.

[0137] As another example, there may be a case where CA is applied to the sidelink (i.e., sidelink transmission is performed over two or more carriers), and the sidelink transmission is not performed on the carrier over which Uu has been transmitted. For example, it may refer to a case where Uu transmission is performed on component carrier 1 (CC#1) and sidelink transmission is performed on component carrier 2 (CC#2) and component carrier 3 (CC#3). In this case, when the priority value of the sidelink included in the SCI is less than the threshold configured by the gNB, the UE may adjust the transmission power for Uu transmission while maintaining the transmission power for sidelink transmission. Here, the Uu transmission power may be reduced such that the sum of the transmission power for sidelink transmission and the transmission power for Uu transmission is less than or equal to the maximum transmission power (Pcmax) of the UE. Conversely, when the priority value of the sidelink is greater than the threshold configured by the gNB, the UE may adjust the transmission power for sidelink transmission while maintaining the transmission power for Uu transmission. Here, the sidelink transmission power may be reduced such that the sum of the transmission power for Uu transmission and the transmission power for sidelink transmission is less than or equal to the maximum transmission power (Pcmax) of the UE. On the other hand, when the sidelink transmission is performed on the carrier over which Uu has been transmitted, a transmission power allocation method may be applied, such as the case where Uu and sidelink transmissions are performed in the same cell or on the same component carrier as described above.

[0138] Figure 5a and Figure 5b can be applied to Figure 4 the "Scenario 3) The case of simultaneous transmission using four links (NR Uu + NR sidelink + LTE Uu + LTE sidelink)" mentioned in. However, since Scenario 3) includes Scenario 1) and Scenario 2), the above description is not limited to Scenario 3) and can be extended to Scenario 1) and Scenario 2). For example, to explain how the transmission power allocation method of Scenario 3) is applied to Scenario 2), for example, the transmission power allocation method for simultaneously transmitting "NR sidelink + LTE sidelink + LTE Uu" in Scenario 2) can be described as follows.

[0139] - As Figure 5a and 5b described, even in Scenario 2), the available power in the NR link and the LTE link can be allocated first. The transmission power allocated to the NR link can be reallocated to NR Uu and the NR sidelink, and in this case, the transmission power of NRUu can be regarded as zero. Therefore, the transmission power allocated to the NR link can be allotted to the NR sidelink. Meanwhile, the transmission power allocated to the LTE link can be reallocated to LTEUu and the LTE sidelink by using one of the methods described in Figure 5a and 5b .

[0140] Figure 6a And Figure 6b are other examples of allocating the transmission power of the V2X UE according to embodiments of the present disclosure.

[0141] In Figure 6a and Figure 6b , P_Uu may represent the maximum transmission power available for Uu transmission, while P_Side may represent the maximum transmission power available for sidelink transmission. Additionally, P3 may represent the transmission power actually used for Uu transmission, and P4 may represent the transmission power actually used for sidelink transmission. Since the actually used transmission power cannot be greater than the allowed maximum transmission power, in Figure 6a and Figure 6b , P3 ≤ P_Uu and P4 ≤ P_Side should hold. Furthermore, Figure 6a and Figure 6b The P_Total shown in is the maximum transmission power value allowing simultaneous transmission of Uu and sidelink. Here, P_Uu, P_Side, P3, P4, and P_Total have linear values not in units of dB or dBm.

[0142] Figure 6a shows a case where the sum of P_Uu and P_Side is less than P_Total, while Figure 6b shows a case where the sum of P_Uu and P_Side is greater than P_Total. Figure 6a and 6b do not show the case where the sum of P_Uu and P_Side is equal to P_Total, but it can be included in the category of Figure 6a . Furthermore, Figure 6a shows P_Uu __ P_Side, while Figure 6b shows P_Uu > P_Side. However, this is just an example, and the method described in the present disclosure can even be applied to the case where P_Uu < P_Side. In Figure 6a and 6b , Uu transmission may refer to the simultaneous transmission of NR Uu and LTE Uu, or transmission through one of NR Uu and LTE Uu. Additionally, sidelink transmission may refer to the simultaneous transmission of NR sidelink and LTE sidelink, or transmission through one of NR sidelink and LTE sidelink.

[0143] After completing the RRC connection with the base station (RRC connected mode), the NR V2X UE can configure information about P_Uu_dBm, P_Side_dBm, and P_Total_dBm (here, P_Uu_dBm = 10 log10(P_NR), P_Side_dBm = 10 log10(P_LTE), P_Total_dBm = 10 log10(P_Total)) through UE-specific RRC parameters. For example, when the V2X UE establishes an RRC connection with an NR base station (gNB), the V2X UE can receive the corresponding information from the gNB. When the V2X UE establishes an RRC connection with an LTE base station (eNB), the V2X UE can receive information about P_Uu_dBm, P_Side_dBm, and P_Total_dBm from the eNB. As another example, when the V2X UE establishes RRC connections with both the gNB and the eNB, it can receive information about P_Uu_dBm, P_Side_dBm, and P_Total_dBm from the master node. More specifically, the above situation can be regarded as a dual connectivity (DC) scenario. In an LTE-NR DC environment with the eNB as the master node, the eNB can configure the corresponding information as RRC parameters for the NR V2X UE. Additionally, in an NR-LTE DC environment with the gNB as the master node, the gNB can configure the corresponding information as RRC parameters for the NR V2X UE.

[0144] On the other hand, P_Uu_dBm, P_Side_dBm, and P_Total_dBm can be configured from the base station (gNB or eNB) where the V2X UE is located through system information (system information block, SIB) instead of UE-specific RRC configuration. Here, the V2X UE can be in a state where it has not established an RRC connection with the base station it is camped on (i.e., RRC idle state).

[0145] From the perspective of the base stations, when there is an interface between the gNB and the eNB, the gNB and the eNB can negotiate and set the values of P_Uu and P_Side through the interface. In this case, the sum of P_Uu and P_Side can be set to be less than or equal to P_Total. However, when there is no interface between the gNB and the eNB, the gNB and the eNB can independently set the values of P_Uu and P_Side without negotiating the values of P_Uu, P_Side, P_NR, and P_Total. Therefore, there may be a situation where the sum of P_Uu and P_Side is greater than P_Total (P_Uu + P_Side > P_Total) at a specific moment.

[0146] On the other hand, from the perspective of the NR V2X UE, when there is an interface between the Uu-supported modem and the sidelink-supported modem, the Uu-supported modem and the sidelink-supported modem can exchange information about P1 and P2. In this case, even if the base station performs configuration to make P_Uu + P_Side > P_Total hold in the above example, through the exchange of transmit power value information between the Uu-supported modem and the sidelink-supported modem, the NR V2X UE can adjust the transmit power value so that the sum of P3 and P4 is less than or equal to P_Total (P3 + P4 ≤ P_Total). A UE with such capabilities can be identified as a UE capable of performing dynamic power allocation between NR and LTE. Conversely, when there is no interface between the Uu-supported modem and the sidelink-supported modem, information about P3 and P4 cannot be exchanged. In this case, if the base station performs configuration to make P_Uu + P_Side > P_Total hold in the above example, it may be necessary to transmit using only one of the Uu link and the sidelink.

[0147] Next, the transmit power allocation operation will be described in detail according to the capabilities of the UE in the various scenario environments exemplified above.

[0148] - An NR V2X UE that does not have the ability to perform synchronous transmission through the Uu and the sidelink cannot perform synchronous transmission through the Uu and the sidelink. Therefore, such a UE can only transmit using one of the Uu and the sidelink. In this case, one of the following methods can be used to determine which link should be used for transmission.

[0149] The NR V2X UE can perform transmission using only one link according to a preset rule. For example, according to the priority of the physical channels transmitted through each link, transmission on the link through which a channel with a low priority is transmitted can be abandoned, and transmission can be performed only on the link through which a channel with a high priority is transmitted. For example, the control channel can have a higher priority than the data channel. That is, when the control channel is transmitted through the Uu and the data channel is transmitted through the sidelink, transmission can be performed only through the Uu through which the control channel is transmitted. On the other hand, there may be a case where the control channel is transmitted through both the Uu and the sidelink. In this case, the priorities preset for each channel can be followed. Specific examples in this regard will be described in detail later.

[0150] As another example, the NR V2X UE can perform transmission only through one link according to the priority provided by the base station through RRC configuration. More specifically, the gNB or eNB can configure a priority value for the NR V2X UE through RRC parameters according to the data types transmitted through the Uu and sidelink. Based on the configured priority value, the NR V2X UE can abandon the transmission on the link for transmitting low-priority data and can perform transmission only on the link for transmitting high-priority data.

[0151] The NR V2X UE capable of performing synchronous transmission on the Uu and sidelinks can perform the following operations according to the settings of the base station.

[0152] - When P_Uu + P_Side ≤ P_Total is set by the base station The NR V2X UE can perform synchronous transmission of the Uu link and the sidelink by setting the transmission powers of the Uu link and the sidelink to P3 and P4 respectively. Here, the base station can perform configuration so that P3 P_Uu and P4 P_Side holds.

[0153] - When P_Uu + P_Side > P_Tota is set by the base station The NR V2X UE with dynamic power allocation capability can adjust the transmission power value so that P_Uu + P_Side ≤ P_Total holds, and can apply one of the following methods.

[0154] The NR V2X UE can adjust the transmission power values of the Uu and sidelinks. More specifically, the transmission power value of the Uu can be reduced and the transmission power value of the sidelink can be reduced . Here, should hold. w3 and w4 represent the scaling factors of the Uu and sidelinks respectively and can have values between 0 and 1. The NR V2X UE can adjust the transmission power value by determining the values of w3 and w4 that satisfy the conditions 0 ≤ w3 ≤ 1 and 0 ≤ w4 ≤ 1. As another example, the NR V2X UE can adjust the transmission power value by determining the values of w3 and w4 that satisfy the condition 0 ≤ w3 + w4 ≤ 1, where the value of w3 + w4 is between 0 and 1.

[0155] The NR V2X UE can reduce the transmission power value of the sidelink without changing the transmission power value of Uu. This may imply a change to the above example, where w4 is always set to 1. Here, w3 can have a value between 0 and 1. As another variation of the above example, a scenario where w3 is always set to 1 and the value of w4 is between 0 and 1 can be considered.

[0156] As another example, according to the priority of the physical channels transmitted through each link, a situation where a channel with a lower priority has a lower transmission power value compared to a channel with a higher priority can be considered. For example, assuming that the control channel has a higher priority than the data channel, the scaling factor of the control channel can be defined as α , while the scaling factor of the data channel can be defined as β . Here, α The value can always be greater than β The value. Therefore, when the control channel is transmitted through Uu and the data channel is transmitted through the sidelink, the transmission power value can be adjusted so that Holds. Conversely, when the control channel is transmitted through the sidelink and the data channel is transmitted through Uu, the transmission power value can be adjusted so that Holds. On the other hand, there can be a situation where both Uu and the sidelink transmit the control channel or both transmit the data channel. In this case, the priority set in advance for each channel can be followed. A detailed example in this regard will be described later.

[0157] Meanwhile, for an NR V2X UE that does not have the ability of dynamic power allocation, since the information about transmission power allocation cannot be exchanged between the Uu - supported modem and the sidelink - supported modem of the UE, the transmission power value cannot be adjusted so that P_Uu + P_Side ≤ P_Total holds. Therefore, the transmission power value can be set by applying at least one of the methods of transmitting using only one link described above.

[0158] In the above example, the method of allocating transmission power to Uu and the sidelink has been described. However, Uu can consist of NR Uu and LTE Uu, and the sidelink can consist of an NR sidelink and an LTE sidelink. Therefore, it may be necessary to re - allocate the transmission power already allocated to Uu and the sidelink to the NR link and the LTE link. One of the following methods can be considered as a method of transmission power re - allocation.

[0159] [Method of allocating transmission power to NR Uu and LTE Uu].

[0160] The transmission power allocated to Uu can be re - allocated to NR Uu and LTE Uu by adopting at least one of the following methods.

[0161] - Method 1: Allocate transmission power according to a predetermined priority The transmission power can be allocated to NR Uu and LTE Uu according to a predetermined priority. Here, it can be defined in advance such that all physical layer channels transmitted through NR Uu have a higher priority than all physical layer channels transmitted through LTE Uu. Conversely, it can be defined in advance such that all physical layer channels transmitted through LTE Uu have a higher priority than all physical layer channels transmitted through NR Uu.

[0162] As another illustration, the priority can be determined according to the type of physical layer channels transmitted through NR Uu and LTE Uu. That is, according to the priority of the physical channels transmitted through each Uu, the transmission of the Uu through which a channel with a low priority is transmitted can be abandoned, and the transmission can be performed only on the Uu through which a channel with a high priority is transmitted. For example, when PRACH is transmitted through NR Uu and at the same time a physical channel other than PRACH (such as PUCCH or PUSCH) is transmitted through LTE Uu, the UE can abandon the LTE Uu transmission and perform the NR Uu transmission (that is, the transmission power allocated to the Uu is allocated such that the transmission power of LTE Uu is set to 0, and the remaining transmission power is used for NR Uu transmission). Conversely, when a physical channel other than PRACH is transmitted through NR Uu and at the same time PRACH is transmitted through LTE Uu, the UE can abandon the NR Uu transmission and perform the LTE Uu transmission (that is, the transmission power allocated to the Uu is allocated such that the transmission power of NR Uu is set to 0, and the remaining transmission power is used for LTE Uu transmission). For the case of transmitting physical layer channels other than PRACH through NR Uu and LTE Uu, the following method can be adopted as the priority.

[0163] The control channel can have a higher priority than the data channel. For example, PRACH > PUCCH with HARQ-ACK and / or SR (scheduling request) or PUSCH with HARQ-ACK > PUCCH with CSI or PUSCH with CSI > PUSCH > SRS.

[0164] As another example, different from the above example where the transmission power is set to 0, the transmission power of NR Uu or LTE Uu can be reduced such that the sum of the transmission powers for Uu transmission is less than or equal to the maximum transmission power (Pcmax) of the UE. Here, the transmission power of LTE Uu can be reduced while keeping the transmission power of NR Uu (without reducing the transmission power), or the transmission power of NR Uu can be reduced while keeping the transmission power of LTE Uu.

[0165] - Method 2: Allocate transmission power according to the configured priority The base station (eNB or gNB) can configure the priorities of NR Uu and LTE Uu for the UE through system information (SIB) or UE-specific RRC configuration. The UE can forgo transmission through the Uu with low priority and perform transmission through the Uu with high priority (i.e., the transmission power allocated to the Uu is allocated such that the transmission power of the Uu with low priority is set to 0, and the remaining transmission power is used for transmission through the Uu with high priority).

[0166] As another example, the UE can adjust the transmission power for transmission through the Uu with high priority by γ1 and adjust the transmission power for transmission through the Uu with low priority by δ1. Here, γ1 and δ1 are parameters for adjusting the Uu transmission power and can each have a value between 0 and 1. Additionally, γ 1 < δ1.

[0167] As another variation of the above example, the UE can adjust the transmission power for transmission through the Uu with low priority while keeping the transmission power for transmission through the Uu with high priority. This can be regarded as γ the case where 1 is always fixed at 1 and δ1 is used. That is, the transmission power of the Uu with low priority can be reduced by δ1 such that the sum of the transmission powers for NR Uu transmission and LTE Uu transmission is less than or equal to the maximum transmission power (Pcmax) of the UE.

[0168] [Method for Allocating Transmission Power to NR Sidelink and LTE Sidelink].

[0169] The transmission power allocated to the sidelink can be reallocated to the NR sidelink and LTE sidelink by adopting at least one of the following methods.

[0170] - Method 1: Allocate transmission power according to a predetermined priority - The transmission power can be allocated to the NR sidelink and the LTE sidelink according to a predetermined priority. More specifically, in the channels transmitted through each sidelink, the transmission power of the channel with a low priority can be adjusted while maintaining the transmission power of the channel with a high priority. Here, the transmission power of the low-priority channel can be reduced so that the sum of the transmission power for NR sidelink transmission and the transmission power for LTE sidelink transmission is less than or equal to the maximum transmission power (Pcmax) of the UE. There can be various methods to define the priority, and at least one of the following methods can be used.

[0171] LTE sidelink transmission can always have a higher priority than NR sidelink transmission. In this case, the V2X UE can set the NR sidelink transmission power to 0 (abandon or discard sidelink transmission) and perform LTE sidelink transmission (i.e., the transmission power allocated to the sidelink is allocated so that the NR sidelink transmission power is set to 0, and the remaining transmission power is used for LTE sidelink transmission). Conversely, it can be predefined such that the priority of NR sidelink transmission is always higher than that of LTE sidelink transmission.

[0172] The priority can be determined according to the type of physical layer channels transmitted through the NR sidelink and the LTE sidelink. For example, when the NR sidelink synchronization channel (sidelink synchronization signal block, S-SSB) is transmitted through the NR sidelink, the UE can abandon LTE sidelink transmission and perform S-SSB transmission through the NR sidelink. Conversely, when the LTE sidelink synchronization signal (sidelink synchronization signal, SLSS) and the physical layer broadcast channel (physical sidelink broadcast channel, PSBCH) are transmitted through the LTE sidelink, the UE can abandon NR sidelink transmission and perform SLSS and PSBCH transmission through the LTE sidelink. This may mean that the physical layer synchronization channel always has a high priority. For the remaining physical layer, the UE can randomly set the priority.

[0173] As another example of determining the priority according to the type of physical layer channels transmitted through Uu and the sidelink, the priority can be defined by one of the following methods according to the type of physical layer channels and signals transmitted through the sidelink.

[0174] Example 1: The control channel can have a higher priority than the data channel. For example, synchronization channel > PSCCH > PSFCH with HARQ-ACK or PSFCH with CSI > PSSCH with HARQ-ACK or PSSCH with CSI > PSSCH > S-CSI-RS.

[0175] Example 2: The priority can be determined according to the type of control information sent through the physical layer channel (for example, HARQ-ACK information can have a higher priority than CSI information). More specifically, Synchronization Channel > PSCCH > PSFCH with HARQ-ACK or PSSCH with HARQ-ACK > PSFCH with CSI or PSSCH with CSI > PSSCH > S-CSI-RS.

[0176] In the above example, PSCCH and S-CSI-RS may have no priority (i.e., priority may not be considered or have the lowest priority), while the cases of sending HARQ-ACK and sending CSI may have the same priority. Additionally, the channel through which feedback information is sent may have a higher priority than the synchronization channel.

[0177] - Method 2: Allocate transmission power according to the configured priority The NR V2X UE can send sidelink control information (SCI) through the PSCCH to control the transmission of PSSCH, PSFCH, or S-CSI-RS that it sends through the NR sidelink. Here, the NR V2X UE can receive priority information for the transmission of PSSCH, PSFCH, or S-CSI-RS that it will send through the NR sidelink from a higher layer (e.g., the application layer). This priority information can consist of N bits and can be included in the SCI. For example, if the priority information consists of 3 bits, 000 represents priority "0", and 111 represents priority "7", so it can be seen that there are a total of 8 levels of priority. Here, smaller values may be given priority. Similarly, the NR V2X UE can send SCI through the PSCCH, and this SCI is used to control the transmission of PSSCH that it will send through the LTE sidelink. Here, the NR V2X UE can receive priority information for the PSSCH that it will send through the LTE sidelink from a higher layer (e.g., the application layer). Therefore, the NR V2X UE can compare the priority information included in the SCI for NR sidelink transmission and the priority information included in the SCI for LTE sidelink transmission, and can perform sidelink transmission with a higher priority (i.e., the transmission power allocated to the sidelink is allocated such that the transmission power of the sidelink with a lower priority is set to 0, and the remaining transmission power is used for transmission through the sidelink with a higher priority).

[0178] As another example, the UE may adjust the transmission power for transmission via a sidelink with low priority while maintaining the transmission power for transmission via a sidelink with high priority. Here, the transmission power for transmission via the low-priority sidelink may be reduced such that the sum of the transmission power for transmission via the high-priority sidelink and the transmission power for transmission via the low-priority sidelink is less than or equal to the maximum transmission power (Pcmax) of the UE.

[0179] Figure 6a and Figure 6b can be applied to Figure 4 the "Scenario 3) The case of transmitting using four links simultaneously (NR Uu + NR sidelink + LTE Uu + LTE sidelink)" mentioned in. However, since Scenario 3) includes Scenario 1) and Scenario 2), the above description is not limited to Scenario 3) and can be extended to Scenario 1) and Scenario 2). For example, to explain how the transmission power allocation method of Scenario 3) is applied to Scenario 2), for example, the transmission power allocation method for simultaneously transmitting "NR sidelink + LTE sidelink + LTE Uu" in Scenario 2) can be described as follows.

[0180] - As Figure 6a and Figure 6b described, even in Scenario 2), the available power in the Uu and the sidelink can be allocated first. The transmission power allocated to the Uu can be reallocated to the NR Uu and the LTE Uu, and the transmission power allocated to the sidelink can be reallocated to the NR sidelink and the LTE sidelink. Here, the transmission power of the NR Uu can be regarded as zero in Scenario 2). Therefore, the transmission power allocated to the Uu can be allotted to the LTE Uu. Meanwhile, by using Figure 6a and Figure 6b one of the methods described in, the transmission power allocated to the sidelink can be reallocated to the NR sidelink and the LTE sidelink.

[0181] Meanwhile, although not mentioned in the present disclosure, Figure 5a and 5b as well as Figure 6a and 6b any combination of the methods described in is possible. For example, the transmission power of the NR link and the LTE link can be allocated to P_NR and P_LTE as described in Figure 5a and 5B, and in the NR link, the transmission power allocation between the NR Uu and the NR sidelink and the transmission power allocation between the LTE Uu and the LTE sidelink can be performed by using Figure 6a and 6b the method of P_Uu and P_Side described in.

[0182] As another example, the transmission power of Uu and the sidelink can be allocated to Figure 6a and 6b P_Uu and P_Side described in Figure 5a and 5b and the transmission power allocation between NR Uu and LTE Uu and the transmission power allocation between the NR sidelink and the LTE sidelink in the Uu link can be performed by using the

[0183] Figure 7 is a diagram showing the structure of a UE according to an embodiment of the present disclosure.

[0184] Referring to Figure 7 , the UE may include a transceiver 701, a UE controller 701, and a memory 701. In the present disclosure, the UE controller 702 may be defined as a circuit, an application-specific integrated circuit, or at least one processor.

[0185] The transceiver 701 may transmit and receive signals to / from another network entity. The transceiver 701 may perform communication by exchanging signals with, for example, a base station and / or different UEs. The UE controller 702 may control the overall operation of the UE according to the embodiments proposed in the present disclosure. For example, the UE controller 701 may control the signal flow between blocks to perform operations according to the above diagrams and flowcharts.

[0186] The memory 703 may store at least one of the information transmitted and received through the transceiver 701 or the information generated by the UE controller 702.

[0187] Figure 8 is a diagram showing the structure of a base station according to an embodiment of the present disclosure.

[0188] Referring to Figure 8 , the base station may include a transceiver 801, a base station controller 802, and a memory 803. In the present disclosure, the base station controller 802 may be defined as a circuit, an application-specific integrated circuit, or at least one processor.

[0189] The transceiver 801 may transmit and receive signals to / from another network entity. The transceiver 801 may perform communication by exchanging signals with, for example, a UE and / or different network entities, another base station. The base station controller 802 may control the overall operation of the base station according to the embodiments proposed in the present disclosure. For example, the base station controller 802 may control the signal flow between blocks to perform operations according to the above diagrams and flowcharts.

[0190] The memory 803 may store at least one of the information transmitted and received through the transceiver 801 or the information generated by the base station controller 802.

[0191] The above embodiments disclosed in this specification and the accompanying drawings are only specific examples for the convenience of explaining the understanding of the present disclosure, rather than limiting the scope of the present disclosure. Therefore, for the scope of the present disclosure, it should be understood that all changes or modifications other than the embodiments disclosed in the present disclosure are included within the scope of the present disclosure.

Claims

1. A method performed by a user equipment (UE) in a wireless communication system, the method comprising: Receiving, from a base station, a radio resource control (RRC) configuration, the RRC configuration including priority information for determining whether sidelink transmission is prioritized over uplink transmission; When two sidelink transmissions overlap in time with an uplink transmission, where the two sidelink transmissions include a physical sidelink shared channel (PSSCH) transmission using a first radio access technology (RAT) and a physical sidelink feedback channel (PSFCH) transmission using a second RAT: Determining, based on the priority information included in the RRC configuration, to prioritize the two sidelink transmissions or the uplink transmission, and Determining, based on a priority value in a first sidelink control information (SCI) associated with the PSSCH transmission and a priority value in a second SCI associated with the PSFCH transmission, to prioritize the PSSCH transmission or the PSFCH transmission; And Performing transmission based on the determination.

2. The method according to claim 1, the method further comprising discarding a deprioritized one of the PSSCH transmission and the PSFCH transmission.

3. The method according to claim 1, wherein The first RAT is Long Term Evolution (LTE), and the second RAT is New Radio (NR).

4. The method according to claim 1, wherein Each of the priority value in the first SCI and the priority value in the second SCI is represented by a 3-bit field.

5. The method according to claim 4, wherein, The smaller the number of the 3-bit field, the higher the priority of the transmission.

6. A user equipment (UE) in a wireless communication system, the UE comprising: A transceiver; And A controller configured to: Receive, via the transceiver, a radio resource control (RRC) configuration from a base station, the RRC configuration including priority information for determining whether sidelink transmission is prioritized over uplink transmission, When two sidelink transmissions overlap in time with an uplink transmission, where the two sidelink transmissions include a physical sidelink shared channel (PSSCH) transmission using a first radio access technology (RAT) and a physical sidelink feedback channel (PSFCH) transmission using a second RAT: Determine, based on the priority information included in the RRC configuration, to prioritize the two sidelink transmissions or the uplink transmission, and Determine, based on a priority value in a first sidelink control information (SCI) associated with the PSSCH transmission and a priority value in a second SCI associated with the PSFCH transmission, to prioritize the PSSCH transmission or the PSFCH transmission, and Perform transmission based on the determination.

7. The UE according to claim 6, wherein, The controller is further configured to discard a deprioritized one of the PSSCH transmission and the PSFCH transmission.

8. The UE according to claim 6, wherein, The first RAT is Long Term Evolution (LTE), and the second RAT is New Radio (NR).

9. The UE according to claim 6, wherein Each of the priority value in the first SCI and the priority value in the second SCI is represented by a 3-bit field.

10. The UE according to claim 9, wherein, The smaller the number of the 3-bit field, the higher the priority of the transmission.

Images