Method and device for allocating transmission power in wireless communication system

Abstract

The present disclosure relates to a communication technology and a system thereof for integrating IoT technology with a 5G communication system supporting a higher data transmission rate than a 4G system. The present disclosure can be applied to smart services based on 5G communication technology and IoT-related technologies, such as smart homes, smart buildings, smart cities, smart cars, Internet of Vehicles, healthcare, digital education, smart retail, security and safety services. The present disclosure provides a method and apparatus for allocating transmission power in a wireless communication system.

Description

Technical Field

[0001] The present disclosure relates to a method for distributing and allocating transmit power in a wireless communication system, and more specifically, to a method and apparatus for a New Radio (NR) vehicle-to-everything (V2X) UE, which can communicate via one or more of an NR uplink, a Long Term Evolution (LTE) uplink, an NR side link, and an LTE side link to distribute and allocate transmit power. Background Art

[0002] Since the deployment of the 4G communication system, efforts have been made to develop an improved 5G or pre-5G communication system to meet the demand for wireless data traffic. Therefore, the 5G or pre-5G communication system is also called "beyond 4G network" or "post-LTE system".

[0003] 5G communication systems are considered to be implemented in higher frequency (mmWave) bands, such as the 60GHz band, in order to achieve higher data rates. In order to reduce the propagation loss of radio waves and increase the transmission distance, beamforming, massive multiple-input multiple-output (MIMO), full-dimensional MIMO (FD-MIMO), array antennas, analog beamforming, and massive antenna technology are discussed in 5G communication systems.

[0004] In addition, in the 5G communication system, system network improvements are being developed based on advanced small cells, cloud radio access networks (RAN), ultra-dense networks, device-to-device (D2D) communication, wireless backhaul, mobile networks, cooperative communications, coordinated multi-point (CoMP), receiving-end interference cancellation, etc.

[0005] In 5G systems, hybrid FSK and QAM modulation (FQAM) and sliding window superposition coding (SWSC) as advanced coded modulation (ACM), as well as filter bank multi-carrier (FBMC), non-orthogonal multiple access (NOMA) and sparse code multiple access (SCMA) as advanced access technologies have been developed.

[0006] The Internet, a human-centered connected network in which humans generate and consume information, is now evolving toward the Internet of Things (IoT), in which distributed entities (e.g., things) exchange and process information without human intervention. The Internet of Everything (IoE) has emerged, which is formed by IoT technology and big data processing technology through connection with cloud servers. With the demand for technical elements such as "sensing technology", "wired / wireless communication and network infrastructure", "service interface technology", and "security technology" in IoT implementation, sensor networks, machine-to-machine (M2M) communication, machine-type communication (MTC), etc. have been recently studied. Such an IoT environment can provide intelligent Internet technology services to create new value for human life by collecting and analyzing data generated between connected things. IoT can be applied to various fields, including smart homes, smart buildings, smart cities, smart cars or connected cars, smart grids, healthcare, smart appliances, and advanced medical services, through the convergence and combination between existing information technology (IT) and various industrial applications.

[0007] In line with this, various attempts have been made to apply 5G communication systems to IoT networks. For example, technologies such as sensor networks, machine type communications (MTC), and machine-to-machine (M2M) communications can be implemented through beamforming, MIMO, and array antennas. Cloud radio access networks (RANs) as an application of the above big data processing technologies can also be considered as an example of the convergence between 5G and IoT technologies.

[0008] Since various services can be provided with the advancement of the above-mentioned mobile communication systems, a method of efficiently providing these services is required. Summary of the invention

[0009] Technical issues

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

[0011] Technical Solution

[0012] The technical objectives to be achieved in the embodiments of the present disclosure are not limited to the above-mentioned technical objectives, and other technical objectives not mentioned will be clearly understood from the following description by a person skilled in the art to which the present disclosure belongs.

[0013] In the disclosure for solving the above-mentioned problem, a method of a user equipment (UE) in a wireless communication system includes: detecting a first side link transmission using a first radio access technology (RAT) and a second side link transmission using a second RAT; determining whether the first side link transmission and the second side link transmission overlap; in the case where the first side link transmission and the second side link transmission overlap, determining a side link to be transmitted; and transmitting side link information in the determined side link.

[0014] In some examples, the determination of the sidelink to transmit is based on priority information included in sidelink control information (SCI).

[0015] In some examples, transmitting the side link information is transmitting the side link information with a high priority included in the priority information.

[0016] In some examples, the first RAT is fourth generation (4G) and the second RAT is fifth generation (5G).

[0017] In some examples, in the event that the first sidelink transmission and the second sidelink transmission overlap, determining the sidelink to transmit is determined based on priority information indicated by a higher layer.

[0018] In some examples, sending the side link information is sending a side link synchronization signal with a high priority included in the priority information.

[0019] In some examples, the sending of side link information is determined based on priority information predetermined according to the type of physical layer channel, and a high priority side link is sent.

[0020] In some examples, a first sidelink transmission using a first RAT and a second sidelink transmission using a second RAT are determined based on capabilities of the UE.

[0021] In another example of the present disclosure, a UE includes: a transceiver capable of sending and receiving at least one signal; and a controller coupled to the transceiver, wherein the controller is configured to: detect a first side link transmission using a first radio access technology (RAT) and a second side link transmission using a second RAT; determine whether the first side link transmission and the second side link transmission overlap; in the case where the first side link transmission and the second side link transmission overlap, determine a side link to be transmitted; and send side link information in the determined side link.

[0022] Technical Effects

[0023] According to the proposed embodiment, when a V2X UE performs communication through one or more links, the transmission power of the UE is effectively allocated and distributed, thereby achieving smooth communication. BRIEF DESCRIPTION OF THE DRAWINGS

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

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

[0026] Figure 1c is another example of a system for describing an embodiment of the present disclosure.

[0027] Figure 1d is another example of a system for describing an embodiment of the present disclosure.

[0028] Figure 2a It is an example of a V2X communication method performed through a side link.

[0029] Figure 2b is another example of a V2X communication method performed through a side link.

[0030] Figure 3 is an example of a framework structure of V2X communication according to an embodiment of the present disclosure.

[0031] Figure 4 is a diagram showing an example of a link through which an NR V2X UE can perform V2X communication.

[0032] Figure 5a is an example of transmission power allocation of V2X UE according to an embodiment of the present disclosure.

[0033] Figure 5b is another example of transmission power allocation of V2X UE according to an embodiment of the present disclosure.

[0034] Figure 6a is another example of transmission power allocation of V2X UE according to an embodiment of the present disclosure.

[0035] Figure 6b is another example of transmission power allocation of V2X UE according to an embodiment of the present disclosure.

[0036] Figure 7 is a diagram showing the structure of a UE according to an embodiment of the present disclosure.

[0037] Figure 8 is a diagram showing the structure of a base station according to an embodiment of the present disclosure. DETAILED DESCRIPTION

[0038] Hereinafter, embodiments of the present disclosure will be described in detail with reference to the accompanying drawings.

[0039] In the description of the embodiments of the present disclosure, the description of technical details that are well known in the art and not directly related to the present disclosure may be omitted. This is to convey the main points of the present disclosure more clearly by omitting unnecessary descriptions without causing ambiguity.

[0040] Likewise, in the accompanying drawings, some elements are exaggerated, omitted, or only briefly outlined. In addition, the size of each element does not necessarily reflect the actual size. The same reference numerals are used throughout the accompanying drawings to refer to the same or corresponding parts.

[0041] The advantages and features of the present disclosure and methods for achieving these advantages and features can be seen from the following detailed description of the embodiments in conjunction with the accompanying drawings. 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 the technical personnel 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.

[0042] At the same time, it is understood that the blocks of the flowchart and the combination of the flowchart can be performed by computer program instructions. These computer program instructions can be loaded onto a 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 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 product containing means for performing the functions described in the blocks in 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.

[0043] In addition, each block of the flow chart may correspond to a module, a fragment, or a code containing one or more executable instructions for performing one or more logical functions, or to a portion thereof. It should also be noted that, in some optional cases, the functions described by the blocks may be performed in an order different from the order listed. For example, two blocks listed in order may be performed substantially simultaneously, or in reverse order according to the corresponding functions.

[0044] Here, the "unit", "module" etc. used in the present embodiment may refer to software components or hardware components, such as FPGA or ASIC that can perform a certain function or operation. However, "unit" etc. are not limited to hardware or software. Units etc. may be configured to reside in an addressable storage medium or drive one or more processors. For example, units 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, microcodes, circuits, data, databases, data structures, tables, arrays or variables. The functions provided by components and units may be a combination of smaller components and units, which may be combined with other components and units to form larger components and units. In addition, components and units may implement one or more processors in a drive device or a secure multimedia card. In addition, in one embodiment, units etc. may include one or more processors.

[0045] 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 is the core network of the 5G mobile communication standard specified by 3GPP (Mobile Communications Standardization Organization), but technicians in this field should understand that the subject matter of the present disclosure is applicable to other communication systems with similar technical backgrounds without major modifications that deviate from the scope of the present disclosure.

[0046] 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 an unspecified network function (NF), and the analysis results can be used independently by each NF.

[0047] Below, for the convenience of description, some terms and names defined in the 3rd Generation Partnership Project Long Term Evolution (3GPP) standard (standards for 5G, NR, LTE or similar systems) may be used. However, the present disclosure is not limited to these terms and names and can also be applied to systems that comply with other standards.

[0048] In addition, in the following description, for the convenience 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 cited. Therefore, the present disclosure is not limited to the terms used, and other terms referring to entities with equivalent technical meanings may also be used.

[0049] 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. In order to achieve higher data rates, 5G communication systems have been designed to support extremely high frequency (mmWave) bands (e.g., 28 GHz bands). In order 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 are considered for 5G communication systems. In addition, unlike LTE, 5G communication systems support various subcarrier spacings, for example, 15 kHz, 30 kHz, 60 kHz, and 120 kHz, the physical control channel uses polarization 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. While 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.

[0050] In addition, in order to improve the system network in the 5G communication system, technology development is being carried out on evolved small cells, advanced small cells, cloud radio access networks (cloud RAN), ultra-dense networks, device-to-device (D2D) communication, wireless backhaul, vehicle communication networks (vehicle-to-everything (V2X) networks), cooperative communication, coordinated multi-point (CoMP) communication, interference cancellation, etc.

[0051] At the same time, the Internet is evolving from a human-centric network where humans create and consume information to the Internet of Things (IoT), where distributed elements of things exchange and process information. Internet of Everything (IoE) technology has also emerged, combining IoT technology with big data processing technology through connection with cloud servers. In order to realize IoT, technical elements related to sensing, wired / wireless communication and network infrastructure, service interface and security are required, and IoT technologies such as sensor networks, machine-to-machine (M2M) or machine-type communication (MTC) are being studied in recent years. In the IoT environment, smart Internet technology services can be provided to collect and analyze data generated by connected things, adding new value to human life. Through the integration and combination between existing information technology and various industries, IoT technology can be applied to various fields, such as smart homes, smart buildings, smart cities, smart cars or connected cars, smart grids, healthcare, smart consumer electronics and advanced medical services.

[0052] Therefore, various attempts are being made to apply 5G communication systems to IoT networks. For example, technologies such as sensor networks and machine-to-machine (M2M) or machine-type communication (MTC) are being implemented by using 5G communication technologies, including beamforming, MIMO, and array antennas. Cloud RAN as an application of the above-mentioned big data processing technology may be an example of the fusion of 3eG technology and IoT technology. In this way, multiple services can be provided to users in a communication system. In order 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 an apparatus using the method are required. Various services provided in the 5G communication system are currently being studied, one of which is a service that meets the requirements of low latency and high reliability.

[0053] In terms of vehicle communications, standardization of LTE-based V2X using a device-to-device (D2D) communication structure has been completed in 3GPP Rel-14 and Rel-15, and efforts are currently underway to develop 5G New Radio (NR)-based V2X. NR V2X plans to support unicast communication, groupcast (or multicast) communication, and broadcast communication between UEs. In addition, unlike LTE V2X, which is designed to send and receive basic safety information required for vehicles to travel on the road, NR V2X is designed to provide more advanced services, such as platooning, advanced driving, extended sensors, and remote driving.

[0054] 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 the LTE V2X UE. As an example, the NR V2X UE can perform a single transmission or simultaneous transmission as shown below.

[0055] - Case where a single transmission is performed using one of the NR uplink, LTE uplink, NR sidelink, and LTE sidelink

[0056] - Case where two links are used for simultaneous transmission

[0057] *Simultaneous transmission of NR uplink and NR sidelink

[0058] *Simultaneous transmission of NR uplink and LTE sidelink

[0059] *Simultaneous transmission of NR uplink and LTE uplink

[0060] *Simultaneous transmission of NR sidelink and LTE uplink

[0061] * Simultaneous transmission of NR sidelink and LTE sidelink

[0062] *Simultaneous transmission of LTE sidelink and LTE Uu

[0063] - Case of using three links to perform simultaneous transmission

[0064] *Simultaneous transmission of NR sidelink, LTE sidelink and NR uplink

[0065] *Simultaneous transmission of NR sidelink, LTE sidelink and LTE uplink

[0066] *Simultaneous transmission of NR sidelink, NR uplink and LTE uplink

[0067] *Simultaneous transmission of NR uplink, LTE sidelink and LTE uplink

[0068] - Case of using four links to perform simultaneous transmission

[0069] *Simultaneous transmission of NR uplink, NR sidelink, LTE uplink and LTE sidelink

[0070] Which of the above scenarios can be supported can be determined based on the capabilities of the NR V2X UE.

[0071] An NR V2X UE that can only transmit over a single link may need rules on which of the four links should be used for transmission. In addition, since an NR V2X UE that can transmit over two or more links simultaneously has limits on its transmit power, it may have to distribute and allocate the transmit power appropriately so that the transmit power does not exceed its maximum transmit power.

[0072] The embodiments of this specification are proposed to support the above scenarios and aim to provide a method and apparatus for allocating and distributing transmit power for NR V2X UE.

[0073] Figure 1a , Figure 1b , Figure 1c and Figure 1d is an example of a system for describing an embodiment of the present disclosure.

[0074] Figure 1a It shows the situation that all V2X UEs (UE-1 and UE-2) are within the coverage of the base station.

[0075] All V2X UEs can receive data and control information from the base station 103 via a downlink (DL), or send data and control information to the base station 103 via an uplink (UL). Here, the data and control information can be data and control information for V2X communication. Alternatively, the data and control information can be data and control information for conventional cellular communication. In addition, the V2X UE can send and receive data and control information for V2X communication via a side link (SL).

[0076] Figure 1b The diagram shows a situation where UE-1 101 in the V2X UE is located within the coverage of the base station 103 and UE-2 102 is located outside the coverage of the base station 103. Figure 1b The illustration may be referred to as an example of partial coverage.

[0077] UE-1 101 located within the coverage of the base station 103 may receive data and control information from the base station 103 via a downlink (DL), or may transmit data and control information to the base station 103 via an uplink (UL).

[0078] UE-2 102 located outside the coverage of base station 103 cannot receive data and control information from base station 103 via downlink, nor can it send data and control information to base station 103 via uplink.

[0079] UE-2 102 may send and receive data and control information for V2X communication to UE-1 101 via a side link.

[0080] Figure 1c A situation is shown where all V2X UEs are outside the coverage of the base station.

[0081] Therefore, UE-1 101 and UE-2 102 cannot receive data and control information from the base station through a downlink, and cannot transmit data and control information to the base station through an uplink.

[0082] UE-1 101 and UE-2 102 may send and receive data and control information for V2X communication via a side link.

[0083] Figure 1d The following figure shows a scenario where UEs located in different cells perform V2X communication. Specifically, Figure 1dA case where a V2X transmitting UE and a V2X receiving UE are connected to different base stations (RRC connected state) or reside on them (RRC connection released state, i.e., RRC idle state) is shown. Here, UE-1 101 may be a V2X transmitting UE, and UE-2 102 may be a V2X receiving UE. Alternatively, UE-1 101 may be a V2X receiving UE, and UE-2 102 may be a V2X transmitting UE. UE-1 101 may receive a V2X-specific system information block (SIB) from a base station 103 to which it is connected (or on which it resides), and UE-2 102 may receive a V2X-specific SIB from another base station 104 to which it is connected (or on which it resides). Here, the information of the V2X-specific SIB received by UE-1 101 and the information of the V2X-specific SIB received by UE-2 102 may be different from each other. Therefore, in order for UEs located in different cells to perform V2X communication, it is necessary to standardize the information.

[0084] For ease of description, Figure 1a , Figure 1b , Figure 1c and Figure 1d A V2X system consisting of two UEs (UE-1 and UE-2) is shown but not limited thereto. In addition, the uplink and downlink between the base station and the V2X UE may be referred to as a Uu interface, and the side link between the V2X UEs may be referred to as a PC5 interface. Therefore, these may be used interchangeably in the present disclosure.

[0085] Meanwhile, in the present disclosure, UE 101 or 102 may 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. In addition, in the present disclosure, UE may refer to a roadside unit (RSU) equipped with UE functions, an RSU equipped with base station functions, or an RSU equipped with a portion of base station functions and a portion of UE functions.

[0086] In addition, the present disclosure predefines that the base station 103 may 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 may refer to a 5G base station (gNB), a 4G base station (eNB), or a road station unit (RSU). Therefore, unless otherwise specified in the disclosure, the base station and RSU may be used interchangeably because they are used as the same concept.

[0087] Figure 2a and Figure 2b is an example of a V2X communication method performed through a side link.

[0088] like Figure 2a As shown, the TX UE and the RX UE may perform communication in a one-to-one manner, which may be referred to as unicast communication.

[0089] like Figure 2b As shown, the TX UE and the RX UE may perform communication in a one-to-many manner, which may be referred to as groupcast or multicast.

[0090] Figure 2b A case is described in which UE-1 201, UE-2 202, and UE-3 203 form one 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 performs multicast communication only within the group to which it belongs, and does not perform communication between different groups. Figure 2b The formation of two groups is shown, but is not limited thereto.

[0091] At the same time, although Figure 2a and Figure 2b It is not shown in the figure, but the V2X UE can perform broadcast communication. Broadcast communication refers to the situation where all V2X UEs receive data and control information sent by the V2X transmitting UE via the side link. For example, in Figure 2b It is assumed that UE-1 is a transmitting UE for broadcasting, and all UEs (UE-2, UE-3, UE-4, UE-5, UE-6, UE-7) can receive data and control information sent by UE-1 201.

[0092] Figure 3 is an example of a framework structure of V2X communication according to an embodiment of the present disclosure.

[0093] Figure 3 It is shown, but not limited to, that the system operates 1024 radio frames. For example, a specific system may operate less than or more than 1024 radio frames, and the number of radio frames operated by the system may be configured to the UE by the base station using a master information block (MIB) sent through a physical broadcast channel (PBCH), or may be a fixed value agreed upon in advance with the UE. Figure 3 In the NR V2X communication, the radio frame number and the system frame number can be regarded as the same. That is, the radio frame number '0' can correspond to the system frame number '0', and the radio frame number '1' can correspond to the 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 that can be used for NR V2X communication can be expressed as 15kHz x 2n , where n is an integer, its value is 0, 1, 2, 3, .... Figure 3As shown, in NR V2X, the time slots that constitute a subframe are 2 n , which can vary depending on the subcarrier spacing. For example, when a subcarrier spacing of 15kHz is used, one subframe can consist of one time slot (n=0). In addition, when a subcarrier spacing of 30kHz, 60kHz, and 120kHz is used, one subframe can consist of 2 time slots (n=1), 4 time slots (n=2), and 8 time slots (n=3), respectively. Although there is no Figure 3 As shown in , regardless of the subcarrier spacing, one 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 content can be summarized as the following Table 1 (physical layer parameters according to subcarrier spacing).

[0094] [Table 1]

[0095]

[0096] Figure 4 An example of a link through which an NR V2X UE can perform V2X communications is shown.

[0097] Specifically, V2X communication can be performed through at least one of the following links.

[0098] -The link between the NR V2X UE 401 and another NR V2X UE 405 may be referred to as an NR side link. The NR V2X UE 401 may transmit side link control information and data information of NR V2X communication to another NR V2X UE 405 via the NR side link. In addition, the NR V2X UE 401 may receive side link control information and data information of NR V2X communication from another NR V2X UE 405 via the NR side link.

[0099] -The link between the NR V2X UE 401 and the LTE V2X UE 404 may be referred to as an LTE side link. Here, the NR V2X UE 401 may be assumed to have the capability to support LTE V2X communication. The NR V2X UE 401 may send and receive control information and data information of LTE V2X communication via the LTE side link.

[0100] -The downlink or uplink between the NR V2X UE 401 and the NR base station 403 (gNB) can be named NRUu.

[0101] *NR V2X UE 401 can receive control information and data information related to NR side link transmission and reception from NR base station 403 (gNB) via NR Uu. In addition, NR V2X UE 401 can send NR side link control information and data information received from another NR V2X UE 405 to gNB 403 via NR Uu.

[0102] *NR V2X UE 401 may receive control information and data information related to LTE side link transmission and reception from NR base station 403 (gNB) via NR Uu. In addition, NR V2X UE 401 may transmit LTE side link control information and data information received from LTE V2X UE 404 to gNB 403 via NR Uu. Here, NR V2X UE 401 may be assumed to have the capability to support LTE V2X communication.

[0103] -The downlink or uplink between the NR V2X UE 401 and the LTE base station 402 (eNB) can be named LTE Uu.

[0104] *NR V2X UE 401 may receive control information and data information related to NR side link transmission and reception from LTE base station 402 (eNB) via LTE Uu. In addition, NR V2X UE 401 may transmit NR side link control information and data information received from another NR V2X UE 405 to eNB 402 via LTE Uu. Here, it may be assumed that NR V2X UE 401 has the capability to support LTE Uu.

[0105] *NR V2X UE 401 may receive control information and data information related to LTE side link transmission and reception from eNB 402 via LTE Uu. In addition, NR V2X UE 401 may transmit LTE side link control information and data information received from LTE V2X UE 404 to eNB 402 via LTE Uu. Here, it may be assumed that NR V2X UE 401 has the capability of supporting LTE V2X communication and also has the capability of supporting LTE Uu.

[0106] A specific NR V2X UE 401 may simultaneously use Figure 3 In particular, when the NR V2X UE uses two or more links to perform communication at the same time, the following scenarios may exist.

[0107] -Scenario 1) Using two links to send messages at the same time

[0108] *NR Uu+NR side link: NR V2X UE 401 can send NR V2X control information and data information to gNB 403 via NR Uu (or, can send uplink control information and data information of NR cellular communication to gNB 403), and at the same time, can send control information and data information of NR V2X communication to another NR V2X UE 405 via NR side link.

[0109] *NR Uu+LTE side link: NR V2X UE 401 can send NR V2X control information and data information to gNB 403 via NR Uu (or, can send uplink control information and data information of NR cellular communication to gNB 403), and, at the same time, can send control information and data information of LTE V2X communication to LTE V2X UE 404 via LTE side link.

[0110] *NR Uu+LTE Uu: NR V2X UE 401 may send NR V2X control information and data information to gNB 403 via NR Uu (or, may send uplink control information and data information of NR cellular communication), and at the same time, may send LTE V2X control information and data information to eNB 402 via LTE Uu (or, may send uplink control information and data information of LTE cellular communication to eNB 402). In this scenario, since NR V2X control information and data information are not sent via the NR side link, it cannot be regarded as the operation of NR V2X UE. Since the present disclosure is for identifying the operation of NR V2X UE, this scenario may be excluded from the present disclosure.

[0111] *NR side link + LTE Uu: NR V2X UE 401 can send control information and data information of NR V2X communication to another NR V2X UE 405 via NR side link, and at the same time, can send NR V2X control information and data information to gNB 403 via NR Uu (or, can send uplink control information and data information of NR cellular communication to gNB 403).

[0112] *NR side link + LTE side link: NR V2X UE 401 can send control information and data information of NR V2X communication to another NR V2X UE 405 via the NR side link, and at the same time, can send control information and data information of LTE V2X communication to LTE V2X UE 404 via the LTE side link.

[0113] *LTE side link + LTE Uu: NR V2X UE 401 can send control information and data information of LTE V2X communication to LTE V2X UE 404 via LTE side link, and at the same time, can send LTE V2X control information and data information to eNB 402 via LTE Uu (or, can send uplink control information and data information of LTE cellular communication to eNB 402). In this scenario, since control information and data information are not sent via NR Uu or NR side link, it cannot be regarded as the operation of NR V2X UE (that is, it can be regarded as the operation of LTE V2X UE). Since the present disclosure is to identify the operation of NR V2X UE, this scenario can be excluded from the present disclosure.

[0114] -Scenario 2) Using three links to send messages simultaneously

[0115] *NR side link + LTE side link + NR Uu: NR V2X UE 401 can send control information and data information of NR V2X communication and LTE V2X communication through NR side link and LTE side link respectively. At the same time, it can send NR V2X control information or data information to gNB 403 through NR Uu (or, it can send uplink control information and data information of NR cellular communication to gNB 403).

[0116] *NR Uu+NR side link+LTE Uu: NR V2X UE 401 can send NR V2X control information and data information to gNB 403 through NR Uu (or, send uplink control information and data information of NR cellular communication to gNB 403), and can send control information and data information of NR V2X communication through NR side link to another NR V2X UE 405. At the same time, NR V2X UE 401 can send LTE V2X control information and data information to eNB 402 through LTE Uu (or, can send uplink control information and data information of LTE cellular communication to eNB 402).

[0117] *NR Uu+LTE side link+LTE Uu: NR V2X UE 401 can send NR V2X control information or data information to gNB 403 through NR Uu (or, send uplink control information and data information of NR cellular communication to gNB 403), and can send control information and data information of LTE V2X communication to LTE V2X UE 404 through LTE side link. At the same time, NR V2X UE 401 can send LTE V2X control information or data information to eNB 402 through LTE Uu (or, can send uplink control information and data information of LTE cellular communication to eNB 402).

[0118] *NR side link + LTE side link + LTE Uu: NR V2X UE 401 can send control information and data information of NR V2X communication and LTE V2X communication through NR side link and LTE side link respectively, and at the same time, can send LTE V2X control information or data information to eNB 402 through LTE Uu (or, can send uplink control information and data information of LTE cellular communication to eNB 402).

[0119] - Scenario 3) Using four links to send messages simultaneously

[0120] *NR Uu+NR side link+LTE Uu+LTE side link: NR V2X UE 401 can send NR V2X control information or data information to gNB 403 through NR Uu (or, send uplink control information and data information of NR cellular communication to gNB 403), and can send control information and data information of NR V2X communication through NR side link to another NR V2X UE 405. At the same time, NR V2X UE 401 can send LTE V2X control information or data information to eNB 402 through LTE Uu (or, send uplink control information and data information of LTE cellular communication to eNB 402), and can send LTE V2X control information or data information to LTE V2X UE 404 through LTE side link.

[0121] 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 side links to send NR V2X control information and data information by using NR side link 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 UuCA. Moreover, the NR V2X UE can use one or more LTE side links to send LTE V2X control information and data information by using LTE side link CA.

[0122] The NR V2X UE 401 may need to perform transmission on a single link or support at least one of the above-mentioned scenarios according to its capabilities. Therefore, the NR V2X UE 401 that can only perform single-link transmission may need to allocate 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 transmission power, and they may be applied. Figure 5a , Figure 5b , Figure 6a and Figure 6b One of the methods mentioned in .

[0123] Figure 5a and Figure 5b is an example of allocating the transmission power of a V2X UE according to an embodiment of the present disclosure.

[0124] exist Figure 5a and Figure 5b In the example, P_NR can represent the maximum transmit power available for NR transmission, and P_LTE can represent the maximum transmit power available for LTE transmission. In addition, P1 can represent the transmit power actually used for NR transmission, and P2 can represent the transmit power actually used for LTE transmission. Here, since the transmit power actually used cannot be greater than the maximum transmit power allowed, P1≤P_NR and P2≤P_LTE, Figure 5a and Figure 5b In P1≤P_NR and P2≤P_LTE, it should hold. In addition, Figure 5a and Figure 5b The P_Total shown in is the maximum transmission power value allowed when the NR link and the LTE link are transmitted simultaneously. Here, P_NR, P_LTE, P1, P2, and P_Total have linear values ​​that are not in dB or dBm.

[0125] 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.

[0126] In Figure 5a and Figure 5b NR transmission may refer to simultaneous transmission on NR Uu and NR side link, or transmission through one of the links of NR Uu and NR side link. In addition, LTE transmission may refer to simultaneous transmission on LTE Uu and LTE side link, or transmission through one of the links of LTE Uu and LTE side link.

[0127] 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 = 10log10(P_NR), P_LTE_dBm = 10log10(P_LTE), and P_Total_dBm = 10log10(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-connection (DC) scenarios. In the 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 the 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.

[0128] On the other hand, P_NR_dBm, P_LTE_dBm and P_Total_dBm may be configured from the base station (gNB or eNB) where the V2X UE is located through system information (system information block, SIB) rather than 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).

[0129] From the perspective of the base station, when there is an interface between the gNB and the eNB, the gNB and the eNB can set the P_NR and P_LTE values ​​through the interface negotiation. 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 the P_NR, P_LTE, and P_Total values. Therefore, at a specific moment, a situation may occur in which the sum of P_NR and P_LTE is greater than P_Total (P_NR+P_LTE>P_Total).

[0130] 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 so that P_NR+P_LTE>P_Total in the above example holds, the NR V2X UE can adjust the transmit power value 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 value between the NR modem and the LTE modem. A UE with this capability 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, information about P1 and P2 cannot be exchanged. In this case, if the base station performs configuration so that P_NR+P_LTE>P_Total in the above example holds, it may have to perform transmission using only one of the NR link and the LTE link. A UE with this capability can be identified as a UE capable of single uplink operation (SUO) between NR and LTE.

[0131] 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.

[0132] -NR V2X UEs that do not have the capability to perform simultaneous transmission through NR links and LTE links cannot perform simultaneous transmission through NR links and LTE links. Therefore, such UEs can only use one of the NR links and LTE links for transmission (SUO). In this case, one of the following methods can be applied to determine which link should be used for transmission.

[0133] *NR V2X UE can perform transmission using only one link according to preset rules. For example, NR V2X UE can perform transmission only through 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 the gNB, it can set the transmit power to P1 and transmit through the NR link. If the NR V2X UE has established an RRC connection with the eNB, it can set the transmit power to P2 and transmit through the LTE link. If the NR V2X UE has established an RRC connection with both the gNB and the eNB, it can only transmit through the link connected to the master node. For example, when the gNB is the master node, the NR V2X UE can set the transmit power to P1 and transmit through the NR link. When the eNB is the master node, the NR V2X UE can set the transmit power to P2 and transmit through the LTE link.

[0134] *As another example, unlike the above example, according to the priority of the physical channel sent through each link, the transmission of the link through which the channel with a low priority is sent can be abandoned, and the transmission can be performed only through the link through which the channel with a high priority is sent. For example, the control channel may have a higher priority than the data channel. That is, when the control channel is sent through the NR link and the data channel is sent through the LTE link, the transmission can only be performed on the NR link through which the control channel is sent. On the other hand, there may be a situation in which the control channel is sent on the NR link and the LTE link. In this case, the priority set in advance for each channel can be followed. Specific examples in this regard will be described in detail later.

[0135] *As another example, the NR V2X UE may perform transmission through only one link according to the priority provided by the base station through RRC configuration. More specifically, the gNB or eNB may configure a priority value for the NR V2X UE through an RRC parameter according to the type of data transmitted through the NR link and the LTE link. Based on the configured priority value, the NR V2X UE may abandon transmission on the link through which low priority data is transmitted, and may perform transmission only on the link through which high priority data should be transmitted.

[0136] An NR V2X UE capable of performing simultaneous transmission on an NR link and an LTE link may perform the following operations according to the settings of the base station.

[0137] -When P_NR+P_LTE≤P_Total is set by the base station

[0138] *NR V2X UE can perform synchronous transmission on NR link and LTE link by setting the transmission power of NR link and LTE link to P1 and P2 respectively. Here, the base station can perform configuration so that P1 P_NR≤ and P2≤P_LTE hold.

[0139] -When P_NR+P_LTE>P_Total is set by the base station

[0140] *NR V2X UE with dynamic power allocation capability can adjust the transmit power value so that P_NR+P_LTE≤P_Total holds and one of the following methods can be applied.

[0141] **NR V2X UE can adjust the transmit power values ​​of the NR link and the LTE link at the same time. More specifically, the transmit power value of the NR link can be reduced by w1*P_NR, and the transmit power value of the LTE link can be reduced by w2*P_LTE. Here, w1*P_NR+w2*P_LTE≤P_Total should hold. w1 and w2 refer to the scaling factors of the NR link and the LTE link, respectively, and can have values ​​between 0 and 1. The NR V2X UE can adjust the transmit power value by determining the w1 and w2 values ​​that satisfy the conditions of 0≤w1≤1 and 0≤w2≤1. As another example, the NR V2X UE can adjust the transmit power value by determining the w1 and w2 values ​​that satisfy the condition 0≤w1+w2≤1, where the value of w1+w2 is between 0 and 1.

[0142] **The NR V2X UE may reduce the transmit power value of the NR link without changing the transmit power value of the LTE link. This may imply a variation of the above example, where w2 is always set to 1. Here, w1 may have a value between 0 and 1. This scenario may apply but is 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 a master node (establishing an RRC connection with both the gNB and the eNB).

[0143] **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 be applicable but not limited to when the NR V2X UE has established an RRC connection with the gNB (no RRC connection is established with the eNB) or when the gNB is configured as a master node (RRC connection is established with both the gNB and the eNB).

[0144] **As another example, according to the priority of the physical channel sent through each link, a situation in which a low-priority channel has a lower transmit power value than a high-priority channel can be considered. For example, assuming that the control channel has a higher priority than the data channel, the proportional factor of the control channel can be defined as α, and the proportional factor of 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 transmit power value can be adjusted so that α*P_NR+β*P_LTE≤P_Total holds. Conversely, when the control channel is sent through the LTE link and the data channel is sent through the NR link, the transmit power value can be adjusted so that β*P_NR+α*P_LTEP_Total≤ holds. On the other hand, there may be a situation in which both the NR link and the LTE link send control channels or both send data channels. In this case, the priority set in advance for each channel can be followed. Detailed examples in this regard will be described later.

[0145] * Meanwhile, for NR V2X UEs without dynamic power allocation capability, since information about transmit power allocation cannot be exchanged between the UE's NR modem and LTE modem, the transmit power value cannot be adjusted to make P_NR+P_LTE≤P_Total hold. Therefore, one of the above-mentioned SUO methods can be applied to set the transmit power value.

[0146] In the above example, a method of allocating transmit power to an NR link and an LTE link has been described. However, an NR link may consist of an NR Uu and an NR side link, and an LTE link may consist of an LTE Uu and an LTE side link. Therefore, it may be necessary to reallocate the transmit 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 may be considered as a method of transmit power reallocation.

[0147] [Method of allocating transmission power to LTE Uu and LTE sidelink]

[0148] The transmission power allocated to the LTE link can be reallocated to the LTE Uu and LTE side link by adopting at least one of the following methods.

[0149] - Method 1: Allocate transmission power according to predetermined priority

[0150] *The transmission power can be allocated to LTE Uu and LTE sidelink according to a predetermined priority. In this case, the priority can be determined according to the type of physical layer channels transmitted through Uu and sidelink. In addition, it can be assumed at this time that the transmission through Uu and sidelink is performed in the same cell or the same component carrier (CC). For example, when the physical layer random access channel is transmitted through Uu and the sidelink control information and data information are transmitted through the sidelink at the same time, the UE can abandon the sidelink transmission and perform Uu link transmission (i.e., the transmission power allocated to the LTE link is allocated so that the transmission power of the sidelink is set to 0, and the remaining transmission power is used for Uu transmission). Conversely, when a physical layer channel other than the random access channel (e.g., a physical layer uplink data channel or a physical layer uplink control channel) is transmitted through Uu and the sidelink control information and data information are transmitted through the sidelink at the same time, the UE can abandon the Uu transmission and perform the sidelink transmission (i.e., the transmission power allocated to the LTE link is allocated so that the transmission power of the Uu is set to 0, and the remaining transmission power is used for the sidelink transmission).

[0151] *As another example, a case where CA is applied to the side link can be considered. That is, it may refer to a case where sidelink control information and data are transmitted through two or more carriers and Uu transmission is performed simultaneously. In this case, the sidelink transmission may not be performed on the carrier where Uu transmission is performed. 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, while maintaining the transmission power for Uu transmission, the sidelink transmission power can be reduced so 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. On the other hand, when sidelink transmission is performed on a carrier where Uu transmission is performed, as in the case where simultaneous transmission of Uu and sidelink is performed in the same cell as described above, the transmission power can be allocated to Uu or sidelink based on a preset priority according to the physical layer.

[0152] -Method 2: Allocate transmit power based on configured priority

[0153] *The eNB may configure a threshold value of the priority to the UE via system information (SIB) or UE-specific RRC configuration. Moreover, the UE may receive a priority value of the side link to be sent by it from a higher layer of the UE (e.g., an application layer). Here, it may be assumed that Uu and side link transmissions are performed in the same cell or the same component carrier. The UE may compare the threshold value of the priority configured by the eNB with the priority value of the side link to be sent by the UE. When the priority value of the side link is less than the threshold value configured by the eNB (a smaller value is given priority), the UE may abandon Uu transmission and perform side link transmission (i.e., the transmission power allocated to the LTE link is allocated so that the transmission power of the Uu is set to 0, and the remaining transmission power is used for side link transmission). Conversely, when the priority value of the side link is greater than the threshold value configured by the eNB, the UE may abandon side link transmission and perform Uu transmission (i.e., the transmission power allocated to the LTE link is allocated so that the transmission power of the side link is set to 0, and the remaining transmission power is used for Uu transmission).

[0154] *As another example, a case where CA is applied to the side link may be considered. That is, it may refer to a case where side link transmission is performed through two or more carriers and Uu transmission is performed simultaneously. In this case, the side link transmission may not be performed on the carrier where Uu transmission is performed. For example, it may refer to a case where Uu transmission is performed on component carrier 1 (CC#1) and side link transmission is performed on component carrier 2 (CC#2) and component carrier 3 (CC#3). In this case, when the priority value of the side link is less than a threshold value configured by the eNB (a smaller value takes precedence), the UE may adjust the transmit power for Uu transmission while maintaining the transmit power for side link transmission. Here, the Uu transmit power may be reduced so that the sum of the transmit power for side link transmission and the transmit power for Uu transmission is less than or equal to the maximum transmit power (Pcmax) of the UE. Conversely, when the priority value of the side link is greater than the threshold value configured by the eNB, the UE may adjust the transmit power for side link transmission while maintaining the transmit power for Uu transmission. Here, the sidelink transmission power may be reduced so 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 a carrier through which Uu transmission is performed, the transmission power allocation method may be applied as in the case where the Uu and sidelink transmissions are performed in the same cell or the same component carrier as described above.

[0155] [Method of allocating transmit power to NR Uu and NR sidelink]

[0156] The transmit power allocated to the NR link can be reallocated to the NR Uu and NR side links by adopting at least one of the following methods:

[0157] -Method 1: Allocating transmit power according to a predetermined priority -The transmit power may be allocated to the NR Uu and NR sidelink according to a predetermined priority. More specifically, the transmit power of a channel with a low priority may be adjusted while maintaining the transmit power of a channel with a high priority. Here, the transmit power of the low priority channel may be reduced so that the sum of the transmit power for Uu transmission and the transmit power for sidelink transmission is less than or equal to the maximum transmit power (Pcmax) of the UE. There may be various methods for defining the priority, and at least one of the following methods may be used.

[0158] *When Uu and sidelink transmissions are performed in the same cell or the same component carrier, Uu transmission may always have a higher priority than sidelink transmission. In this case, the V2X UE may set the sidelink transmission power to 0 (abandon or discard the sidelink transmission) and perform Uu transmission (i.e., the transmission power allocated to the NR link is allocated so that the transmission power of the sidelink is set to 0 and the remaining transmission power is used for Uu transmission). The above example may also apply to the case where Uu and sidelink transmissions are performed in different cells or different component carriers.

[0159] *Priority can be determined based on the type of physical layer channels sent via Uu and sidelink. For example, when a physical random access channel (PRACH) is sent via Uu and a sidelink transmission is performed simultaneously, the UE may abandon the sidelink transmission and perform Uu link transmission. This may mean that regardless of the physical layer channel sent via the sidelink, the PRACH of Uu always has a high priority. The above example may apply to cases where Uu and sidelink transmissions are performed in different cells (or different component carriers) as well as cases where Uu and sidelink transmissions are performed in the same cell.

[0160] *As another example of determining priority based on the type of physical layer channels sent through Uu and sidelink, the following case can be considered. The physical layer channels and signals sent through Uu may include a 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). The physical layer channels and signals sent through the sidelink may 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). Priority can be defined using one of the following methods based on various combinations of the above channels.

[0161] **Example 1: The Uu channel may have a higher priority than the sidelink channel, and the control channel in the Uu or sidelink may 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>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 examples, PSCCH and PSSCH may have the same priority. In addition, in the above examples, SRS and S-CSI-RS may have the same priority. The above examples are applicable 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).

[0162] **Example 2: The priority of the sidelink channel can be higher than the Uu channel, and the priority of the control channel in the sidelink or Uu can be higher than 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 examples, PSCCH and PSSCH may have the same priority. In addition, in the above examples, SRS and S-CSI-RS may have the same priority. The above examples are applicable to the case where Uu and side link transmissions are performed in different cells (or, different CCs), as well as the case where Uu and side link transmissions are performed in the same cell (or, the same CC).

[0163] -Method 2: Allocate transmit power based on configured priority

[0164] *NR V2X UE may send Sidelink Control Information (SCI) to control the PSSCH, PSFCH or S-CSI-RS transmission it sends via PSCCH. Here, the NR V2X UE may receive priority information of the PSSCH, PSFCH or S-CSI-RS transmission to be sent by it from a higher layer (e.g., an application layer). 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 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 via 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-mentioned SCI field. When the priority value of the side link is less than the threshold configured by the gNB, the NR V2X UE may abandon Uu transmission and perform side link transmission (i.e., the transmit power allocated to the NR link is allocated so that the transmit power of the Uu is set to 0 and the remaining transmit power is used for side link transmission). Conversely, when the priority value of the side link is greater than the threshold configured by the eNB, the UE may abandon side link transmission and perform Uu transmission (i.e., the transmit power allocated to the NR link is allocated so that the transmit power of the side link is set to 0 and the remaining transmit power is used for Uu transmission). This operation may be applied when CA is not applied to the side link, or when CA is applied to the side link but the cell (or CC) in which the NR Uu is transmitted is the same as the cell in which the side link is transmitted.

[0165] *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 a carrier over which Uu is 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 a threshold value configured by the gNB, the UE may adjust the transmit power for Uu transmission while maintaining the transmit power for the sidelink transmission. Here, the Uu transmit power may be reduced so that the sum of the transmit power for the sidelink transmission and the transmit power for the Uu transmission is less than or equal to the maximum transmit power (Pcmax) of the UE. Conversely, when the priority value of the sidelink is greater than the threshold value configured by the gNB, the UE may adjust the transmit power for the sidelink transmission while maintaining the transmit power for Uu transmission. Here, the sidelink transmission power can be reduced so 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 through which Uu is transmitted, the transmission power allocation method can be applied, such as the case where Uu and sidelink transmission are performed in the same cell or the same component carrier as described above.

[0166] Figure 5a and Figure 5b Can be applied to Figure 4 The "Scenario 3) is a case where four links are used for transmission simultaneously (NR Uu + NR side link + LTE Uu + LTE side link)" mentioned in the specification. 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, in order to explain how the transmission power allocation method of scenario 3) is applied to scenario 2), the transmission power allocation method of simultaneously transmitting "NR side link + LTE side link + LTE Uu" in scenario 2) can be described as follows.

[0167] -like Figure 5a and 5b As described above, even in scenario 2), the available power in the NR link and the LTE link can be allocated first. The transmit power allocated to the NR link can be reallocated to the NR Uu and the NR side link, and in this case, the transmit power of the NRUu can be regarded as zero. Therefore, the transmit power allocated to the NR link can be fully allocated to the NR side link. At the same time, the transmit power allocated to the LTE link can be allocated by using Figure 5a and 5b One of the methods described in reallocation to LTEUu and LTE sidelink.

[0168] Figure 6a and Figure 6b are other examples of allocating the transmit power of a V2X UE according to an embodiment of the present disclosure.

[0169] exist Figure 6a and Figure 6b In the example, P_Uu can represent the maximum transmit power available for Uu transmission, and P_Side can represent the maximum transmit power available for sidelink transmission. In addition, P3 can represent the transmit power actually used for Uu transmission, and P4 can represent the transmit power actually used for sidelink transmission. Since the transmit power actually used cannot be greater than the maximum transmit power allowed, Figure 6a and Figure 6b In this case, P3≤P_Uu and P4≤P_Side should hold. In addition, Figure 6a and Figure 6b The P_Total shown in is the maximum transmission power value that allows simultaneous transmission of Uu and Sidelink. Here, P_Uu, P_Side, P3, P4, and P_Total have linear values ​​that are not in dB or dBm.

[0170] Figure 6a shows the case where the sum of P_Uu and P_Side is less than P_Total, while Figure 6b The case where the sum of P_Uu and P_Side is greater than P_Total is shown. Figure 6a and 6b The case where the sum of P_Uu and P_Side equals P_Total is not shown in FIG, but it can be included in Figure 6a In addition, Figure 6a shows P_Uu__P_Side, while Figure 6b It is shown that 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. Figure 6a and 6b In the present invention, Uu transmission may refer to simultaneous transmission of NR Uu and LTE Uu, or transmission through one of NR Uu and LTE Uu. In addition, sidelink transmission may refer to simultaneous transmission of NR sidelink and LTE sidelink, or transmission through one of NR sidelink and LTE sidelink.

[0171] After completing the RRC connection with the base station (RRC connection mode), the NR V2X UE can configure information about P_Uu_dBm, P_Side_dBm and P_Total_dBm through UE-specific RRC parameters (here, P_Uu_dBm=10log10(P_NR), P_Side_dBm=10log10(P_LTE), P_Total_dBm=10log10(P_Total)). For example, when the V2X UE establishes an RRC connection with the NR base station (gNB), the V2X UE can receive corresponding information from the gNB. When the V2X UE establishes an RRC connection with the 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 has established an RRC connection 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, and in an LTE-NR DC environment where the eNB is the master node, the eNB can configure the corresponding information as RRC parameters to the NR V2X UE. In addition, in an NR-LTE DC environment where the gNB is the master node, the gNB can configure the corresponding information as RRC parameters to the NR V2X UE.

[0172] 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 no RRC connection is established with the base station where it resides (i.e., RRC idle state).

[0173] From the perspective of the base station, when there is an interface between the gNB and the eNB, the gNB and the eNB can set the P_Uu and P_Side values ​​through interface negotiation. 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 P_Uu and P_Side values ​​without negotiating the P_Uu, P_Side P_NR, and P_Total values. Therefore, at a specific moment, the sum of P_Uu and P_Side may be greater than P_Total (P_Uu+P_Side>P_Total).

[0174] On the other hand, from the perspective of the NR V2X UE, when there is an interface between the Uu support modem and the sidelink support modem, the Uu support modem and the sidelink support modem can exchange information about P1 and P2. In this case, even if the base station performs configuration so that P_Uu+P_Side>P_Total in the above example holds, through the exchange of transmit power value information between the Uu support modem and the sidelink support 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 this capability can be identified as a UE capable of dynamic power allocation between NR and LTE. Conversely, when there is no interface between the Uu support modem and the sidelink support modem, information about P3 and P4 cannot be exchanged. In this case, if the base station performs configuration so that P_Uu+P_Side>P_Total in the above example holds, it may be necessary to use only one of the Uu link and the sidelink for transmission.

[0175] 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.

[0176] -NR V2X UEs that do not have the capability to perform simultaneous transmission via Uu and sidelink cannot perform simultaneous transmission via Uu and sidelink. Therefore, such UEs can only use one of the Uu and sidelink for transmission. In this case, one of the following methods can be used as to which link should be used for transmission.

[0177] *NR V2X UE can perform transmission using only one link according to preset rules. For example, according to the priority of the physical channel transmitted through each link, the transmission on the link through which the channel with low priority is transmitted can be abandoned, and the transmission can be performed only on the link through which the channel with 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 Uu and the data channel is transmitted through the side link, the transmission can be performed only through the Uu through which the control channel is transmitted. On the other hand, there may be a situation in which the control channel is transmitted through Uu and the side link. In this case, the priority set in advance for each channel can be followed. Specific examples in this regard will be described in detail later.

[0178] *As another example, the NR V2X UE may perform transmission over only one link according to the priority provided by the base station through RRC configuration. More specifically, the gNB or eNB may configure a priority value for the NR V2X UE through RRC parameters according to the type of data transmitted over Uu and the side link. Based on the configured priority value, the NR V2X UE may abandon transmission on a link that transmits low priority data and may perform transmission only on a link that should transmit high priority data.

[0179] NR V2X UE capable of performing synchronous transmission on Uu and side link can perform the following operations according to the settings of the base station.

[0180] -When P_Uu+P_Side≤P_Total is set by the base station

[0181] *NR V2X UE can perform synchronous transmission of Uu link and side link by setting the transmission power of Uu link and side link to P3 and P4 respectively. Here, the base station can perform configuration so that P3≤P_Uu and P4 P_Side≤ hold.

[0182] - When P_Uu+P_Side>P_Tota is set by the base station

[0183] *NR V2X UE with dynamic power allocation capability can adjust the transmit power value so that P_Uu+P_Side≤P_Total holds and one of the following methods can be applied.

[0184] **NR V2X UE can adjust the transmit power values ​​of Uu and side link. More specifically, the transmit power value of Uu can be reduced by w3*P_Uu, and the transmit power value of the side link can be reduced by w4*P_Side. Here, w3*P_Uu+w4*P_Side≤P_Total should hold. w3 and w4 represent the scaling factors of Uu and side link, respectively, and can have values ​​between 0 and 1. The NR V2X UE can adjust the transmit power value by determining the w3 and w4 values ​​that satisfy the conditions 0≤w3≤1 and 0≤w4≤1. As another example, the NR V2X UE can adjust the transmit power value by determining the w3 and w4 values ​​that satisfy the conditions 0≤w3+w4≤1, where the value of w3+w4 is between 0 and 1.

[0185] **NR V2X UE can reduce the transmit power value of the sidelink without changing the transmit power value of Uu. This may mean a variation of the above example, where w4 is always set to 1. Here, w3 may have a value between 0 and 1. As another variation of the above example, a scenario where w3 is always set to 1 and w4 has a value between 0 and 1 may be considered.

[0186] **As another example, according to the priority of the physical channel sent through each link, a situation in which a low priority channel has a lower transmission power value than a high priority channel can be considered. For example, assuming that the control channel has a higher priority than the data channel, the proportional factor of the control channel can be defined as α, and the proportional factor of the data channel can be defined as β. Here, the α value can always be greater than the β value. Therefore, when the control channel is sent through Uu and the data channel is sent through the side link, the transmission power value can be adjusted so that α*P_Uu+β*P_Side≤P_Total holds. Conversely, when the control channel is sent through the side link and the data channel is sent through Uu, the transmission power value can be adjusted so that β*P_Uu+α*P_Side≤P_Total holds. On the other hand, there may be a situation in which both Uu and the side link send control channels or both send data channels. In this case, the priority set in advance for each channel can be followed. Detailed examples in this regard will be described later.

[0187] * Meanwhile, for NR V2X UEs that do not have dynamic power allocation capability, since information about transmit power allocation cannot be exchanged between the Uu support modem and the sidelink support modem of the UE, the transmit power value cannot be adjusted so that P_Uu+P_Side≤P_Total holds. Therefore, the transmit power value can be set by applying at least one of the above methods for transmitting using only one link.

[0188] In the above example, a method of allocating transmit power to Uu and side link has been described. However, Uu may consist of NR Uu and LTE Uu, and side link may consist of NR side link and LTE side link. Therefore, it may be necessary to reallocate the transmit power already allocated to Uu and side link to NR link and LTE link. One of the following methods may be considered as a method of transmit power reallocation.

[0189] [Method of allocating transmit power to NR Uu and LTE Uu].

[0190] The transmit power allocated to Uu may be reallocated to NR Uu and LTE Uu by adopting at least one of the following methods.

[0191] - Method 1: Allocate transmission power according to predetermined priority

[0192] *The transmission power may be allocated to NR Uu and LTE Uu according to a predetermined priority. Here, it may be defined in advance so that all physical layer channels transmitted through NR Uu have a higher priority than all physical layer channels transmitted through LTE Uu. Conversely, it may be defined in advance so that all physical layer channels transmitted through LTE Uu have a higher priority than all physical layer channels transmitted through NR Uu.

[0193] *As another illustration, the priority may be determined based on the type of physical layer channels transmitted through NR Uu and LTE Uu. That is, based on 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 may be abandoned, and transmission may 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 (e.g., PUCCH or PUSCH) is transmitted through LTE Uu, the UE may abandon LTE Uu transmission and perform NR Uu transmission (i.e., the transmission power allocated to Uu is allocated so 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 may abandon NR Uu transmission and perform LTE Uu transmission (i.e., the transmission power allocated to Uu is allocated so 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 where physical layer channels other than PRACH are sent through NR Uu and LTE Uu, the following methods can be used as priority.

[0194] **Control channels can have higher priority than data channels. 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.

[0195] *As another example, unlike the above example where the transmit power is set to 0, the transmit power of NR Uu or LTE Uu may be reduced so that the sum of the transmit powers used for Uu transmission is less than or equal to the maximum transmit power (Pcmax) of the UE. Here, the transmit power of LTE Uu may be reduced while maintaining the transmit power of NR Uu (without reducing the transmit power), or the transmit power of NR Uu may be reduced while maintaining the transmit power of LTE Uu.

[0196] -Method 2: Allocate transmit power based on configured priority

[0197] *The base station (eNB or gNB) may configure the priority of NR Uu and LTE Uu to the UE via system information (SIB) or UE-specific RRC configuration. The UE may abandon transmission via the Uu with low priority and perform transmission via the Uu with high priority (i.e., the transmit power allocated to the Uu is allocated so that the transmit power of the Uu with low priority is set to 0 and the remaining transmit power is used for transmission via the Uu with high priority).

[0198] *As another example, the UE may adjust the transmit power for transmission through Uu having a high priority by γ1, and adjust the transmit power for transmission through Uu having a low priority by δ1. Here, γ1 and δ1 are parameters for adjusting Uu transmit power, and may each have a value between 0 and 1. In addition, γ1<δ1.

[0199] *As another variation of the above example, the UE may adjust the transmit power for transmissions through Uu with low priority while maintaining the transmit power for transmissions through Uu with high priority. This may be viewed as a case where γ1 is always fixed to 1 and δ1 is used. That is, the transmit power of Uu with low priority may be reduced by δ1 so that the sum of the transmit power for NR Uu transmission and the transmit power for LTE Uu transmission is less than or equal to the maximum transmit power (Pcmax) of the UE.

[0200] [Method for allocating transmit power to NR side link and LTE side link].

[0201] The transmit power allocated to the side link may be reallocated to the NR side link and the LTE side link by adopting at least one of the following methods.

[0202] -Method 1: Allocating transmit power according to a predetermined priority -The transmit power may be allocated to the NR side link and the LTE side link according to a predetermined priority. More specifically, among the channels transmitted through each side link, the transmit power of the channel with a low priority may be adjusted while maintaining the transmit power of the channel with a high priority. Here, the transmit power of the low priority channel may be reduced so that the sum of the transmit power for the NR side link transmission and the transmit power for the LTE side link transmission is less than or equal to the maximum transmit power (Pcmax) of the UE. There may be various methods for defining the priority, and at least one of the following methods may be used.

[0203] *LTE sidelink transmission may always have a higher priority than NR sidelink transmission. In this case, the V2XUE may set the NR sidelink transmission power to 0 (abandon or discard the sidelink transmission) and perform LTE sidelink transmission (i.e., the transmission power allocated to the sidelink is allocated so that the transmission power of the NR sidelink is set to 0 and the remaining transmission power is used for LTE sidelink transmission). Conversely, it may be predefined so that the priority of the NR sidelink transmission is always higher than the priority of the LTE sidelink transmission.

[0204] *Priority can be determined based on the type of physical layer channels transmitted via the NR sidelink and the LTE sidelink. For example, when the NR sidelink synchronization channel (Sidelink Synchronization Signal Block, S-SSB) is transmitted via the NR sidelink, the UE can abandon the LTE sidelink transmission and perform S-SSB transmission via 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 via the LTE sidelink, the UE can abandon the NR sidelink transmission and perform SLSS and PSBCH transmission via the LTE sidelink. This may mean that the physical layer synchronization channel always has a high priority. For the remaining physical layers, the UE can set the priority randomly.

[0205] *As another example of determining priority based on the type of physical layer channels sent through Uu and side link, priority can be defined by one of the following methods based on the type of physical layer channels and signals sent through the side link.

[0206] **Example 1: Control channels can have higher priority than data channels. 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.

[0207] **Example 2: Priority can be determined based on the type of control information sent through the physical layer channel (e.g., 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.

[0208] **In the above example, PSCCH and S-CSI-RS may have no priority (i.e., may not be considered for priority or have the lowest priority), while the case of sending HARQ-ACK and the case of sending CSI may have the same priority. In addition, the channel through which feedback information is sent may have a higher priority than the synchronization channel.

[0209] -Method 2: Allocate transmit power based on configured priority

[0210] *NR V2X UE may transmit side link control information (SCI) via PSCCH for controlling the transmission of PSSCH, PSFCH or S-CSI-RS to be transmitted by it via the NR side link. Here, the NR V2X UE may receive priority information of the transmission of PSSCH, PSFCH or S-CSI-RS to be transmitted by it via the NR side link from a higher layer (e.g., an application layer). 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 8 levels of priority. Here, a smaller value may be given priority. Similarly, the NR V2X UE may transmit SCI via PSCCH for controlling the transmission of PSSCH to be transmitted by it via the LTE side link. Here, the NR V2X UE may receive priority information of PSSCH to be transmitted by it via the LTE side link from a higher layer (e.g., an application layer). Therefore, the NR V2X UE can compare the priority information included in the SCI for NR side link transmission and the priority information included in the SCI for LTE side link transmission, and can perform high priority side link transmission (i.e., the transmission power allocated to the side link is allocated so that the transmission power of the side link with low priority is set to 0, and the remaining transmission power is used for transmission through the side link with high priority).

[0211] *As another example, the UE may adjust the transmit power for transmissions through a side link having a low priority while maintaining the transmit power for transmissions through a side link having a high priority. Here, the transmit power for transmissions through the low priority side link may be reduced so that the sum of the transmit power for transmissions through the high priority side link and the transmit power for transmissions through the low priority side link is less than or equal to the maximum transmit power (Pcmax) of the UE.

[0212] Figure 6a and Figure 6b Can be applied to Figure 4The "Scenario 3) is a case where four links are used for transmission simultaneously (NR Uu + NR side link + LTE Uu + LTE side link)" mentioned in the specification. 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, in order to explain how the transmission power allocation method of scenario 3) is applied to scenario 2), the transmission power allocation method of simultaneously transmitting "NR side link + LTE side link + LTE Uu" in scenario 2) can be described as follows.

[0213] -like Figure 6a and Figure 6b As described above, even in scenario 2), the available power in Uu and sidelink can be allocated first. The transmit power allocated to Uu can be reallocated to NR Uu and LTE Uu, and the transmit power allocated to sidelink can be reallocated to NR sidelink and LTE sidelink. Here, the transmit power of NR Uu can be regarded as zero in scenario 2). Therefore, the transmit power allocated to Uu can be fully allocated to LTE Uu. At the same time, by using Figure 6a and Figure 6b One of the methods described in , the transmit power allocated to the side link can be reallocated to the NR side link and the LTE side link.

[0214] At the same time, although not mentioned in this disclosure, Figure 5a and 5b as well as Figure 6a and 6b Any combination of the methods described in is possible. For example, the transmit power of the NR link and the LTE link can be as follows: Figure 5a and allocated to P_NR and P_LTE as described in 5B, and in the NR link, the transmit power allocation between the NR Uu and the NR side link and the transmit power allocation between the LTE Uu and the LTE side link can be achieved by using Figure 6a and 6b The methods of P_Uu and P_Side described in are executed.

[0215] As another example, the transmit power of the Uu and side links can be allocated to Figure 6a and 6b and P_Side as described in the Uu link, and in the Uu link, the transmit power allocation between the NR Uu and the LTE Uu and the transmit power allocation between the NR side link and the LTE side link can be achieved by using Figure 5a and 5b The P_NR and P_LTE methods described in are executed.

[0216] Figure 7is a diagram showing the structure of a UE according to an embodiment of the present disclosure.

[0217] Reference Figure 7 , the UE may include a transceiver 701, a UE controller 702, 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.

[0218] The transceiver 701 may send and receive signals to 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 presented in the present disclosure. For example, the UE controller 701 may control the signal flow between blocks so as to perform operations according to the above-mentioned figures and flow charts.

[0219] The memory 703 may store at least one of information transmitted and received by the transceiver 701 or information generated by the UE controller 702 .

[0220] Figure 8 is a diagram showing the structure of a base station according to an embodiment of the present disclosure.

[0221] Reference 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.

[0222] The transceiver 801 may send and receive signals to another network entity. The transceiver 801 may perform communication by exchanging signals with, for example, a UE and / or a different network entity, another base station. The base station controller 802 may control the overall operation of the base station according to the embodiments presented in the present disclosure. For example, the base station controller 802 may control the signal flow between blocks so as to perform operations according to the above-described figures and flow charts.

[0223] The memory 803 may store at least one of information transmitted and received by the transceiver 801 or information generated by the base station controller 802 .

[0224] The above embodiments disclosed in this specification and the accompanying drawings are only used as specific examples to facilitate the understanding of the present disclosure, rather than to limit 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 in 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 a radio resource control (RRC) configuration from a base station, the radio resource control (RRC) configuration including priority information for determining whether a sidelink transmission takes precedence over an uplink transmission; When two sidelink transmissions overlap in time with an uplink transmission, wherein the two sidelink transmissions include a first sidelink transmission using a first radio access technology, RAT, and a second sidelink transmission using a second RAT: determining whether to prioritize the two sidelink transmissions or the uplink transmission based on the priority information included in the RRC configuration, and Determining whether to prioritize the first sidelink transmission or the second sidelink transmission based on a type of control information sent in a physical sidelink feedback channel (PSFCH) of the first sidelink transmission and the second sidelink transmission; and The sending is performed based on the determination.

2. The method according to claim 1, wherein: The sidelink transmission prioritized between the first sidelink transmission and the second sidelink transmission is associated with hybrid automatic repeat request acknowledgement (HARQ-ACK) information.

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. A user equipment UE in a wireless communication system, the UE comprising: Transceiver; as well as A controller, the controller being configured to: receiving, via the transceiver, a radio resource control (RRC) configuration from a base station, the radio resource control (RRC) configuration comprising priority information for determining whether a sidelink transmission takes precedence over an uplink transmission, When two sidelink transmissions overlap in time with an uplink transmission, wherein the two sidelink transmissions include a first sidelink transmission using a first radio access technology, RAT, and a second sidelink transmission using a second RAT: determining whether to prioritize the two sidelink transmissions or the uplink transmission based on the priority information included in the RRC configuration, and determining whether to prioritize the first sidelink transmission or the second sidelink transmission based on a type of control information sent in a physical sidelink feedback channel (PSFCH) of the first sidelink transmission and the second sidelink transmission, and The sending is performed based on the determination.

5. The UE according to claim 4, wherein: The sidelink transmission prioritized between the first sidelink transmission and the second sidelink transmission is associated with hybrid automatic repeat request acknowledgement (HARQ-ACK) information.

6. The UE according to claim 4, wherein: The first RAT is Long Term Evolution (LTE), and the second RAT is New Radio (NR).

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