Method and apparatus for configuring side link data bearer in wireless communication system

Abstract

A communication method of a first sidelink terminal in a wireless communication system is provided. The communication method includes acquiring sidelink radio bearer configuration information, identifying default sidelink radio bearer information in the sidelink radio bearer configuration information, and sending data to a base station or a second sidelink terminal based on the default sidelink radio bearer information.

Description

Technical Field

[0001] The present invention relates to a wireless communication system and more particularly to a method and apparatus for transmitting and receiving signals between terminals by using a side link. Background Art

[0002] In order to meet the growing demand for wireless data services after the commercialization of the fourth generation (4G) communication system, efforts have been made to develop an improved fifth generation (5G) communication system or a pre-5G communication system. For this reason, the 5G communication system or the pre-5G communication system is called a "super 4G network communication system" or a "post-long term evolution (LTE) system". In order to achieve high data rates, it is considered to implement the 5G communication system in a millimeter wave (mmW) band (e.g., a 60GHz band). In order to reduce the propagation path loss of radio waves and increase the propagation distance of radio waves in the millimeter wave band, in the 5G communication system, technologies such as beamforming, massive multiple input multiple output (MIMO), full-dimensional MIMO (FD-MIMO), array antennas, analog beamforming, and massive antennas are being discussed. In addition, in order to improve the network of the system, in the 5G communication system, technologies such as evolved small cells, advanced small cells, cloud radio access networks (cloud RAN), ultra-dense networks, device-to-device (D2D) communications, wireless backhaul, mobile networks, cooperative communications, coordinated multi-point (CoMP), and interference elimination are being developed. In addition, in 5G communication systems, development of advanced coding modulation (ACM) schemes such as hybrid frequency shift keying (FSK) and quadrature amplitude modulation (QAM) modulation (FQAM) or sliding window superposition coding (SWSC), and enhanced network access schemes such as filter bank multi-carrier (FBMC), non-orthogonal multiple access (NOMA) or sparse code multiple access (SCMA) are underway.

[0003] The Internet is evolving from a human-centered connected network where humans create and consume information to an Internet of Things (IoT) network through which distributed elements such as objects exchange and process information. Internet of Everything (IoE) technology is a technology in which IoT technology and big data processing technology are combined through connection with cloud servers. In order to realize IoT, technical elements such as sensing technology, wired / wireless communication and network infrastructure, service interface technology and security technology are required, so technologies for inter-object connection such as sensor networks, machine-to-machine (M2M) communication or machine type communication (MTC) have been studied recently. In the IoT environment, intelligent Internet technology (IT) services can be provided that collect and analyze data generated by connected objects and create new value in human life. IoT can be applied to fields such as smart homes, smart buildings, smart cities, smart cars or connected cars, smart grids, healthcare, smart home appliances and advanced medical services through the fusion and integration of existing information technology (IT) and various industries.

[0004] Various attempts have been made to apply 5G communication systems to IoT networks. For example, technologies such as sensor networks, M2M communications, or MTC are implemented by 5G communication technologies such as beamforming, MIMO, or array antennas. The application of cloud RAN as a big data processing technology can also serve as an example of the fusion of 5G technology and IOT technology.

[0005] As described above, since various services can be provided as a mobile communication system develops, a method for efficiently providing vehicle-to-everything (V2X) communication by using a 5G communication system is particularly required.

[0006] The above information is presented as background information only to assist with understanding the present disclosure. No determination or assertion is made as to whether any of the above might be applicable as prior art with respect to the present disclosure. Summary of the invention

[0007] [Technical solution]

[0008] According to one aspect of the exemplary embodiments, there is provided a communication method in wireless communication.

[0009] [Beneficial Effects]

[0010] Aspects of the present disclosure provide an efficient communication method in a wireless communication system. BRIEF DESCRIPTION OF THE DRAWINGS

[0011] The above and other aspects, features and advantages of certain embodiments of the present disclosure will become more apparent from the following description in conjunction with the accompanying drawings, in which:

[0012] Figure 1A is a diagram showing a structure of wireless time-frequency resources of a New Radio (NR) system according to an embodiment of the present disclosure;

[0013] Figure 1B is a diagram illustrating data transmission in an NR system according to an embodiment of the present disclosure;

[0014] Figure 2 is a diagram illustrating vehicle-to-everything (V2X) communication performed through a side link according to an embodiment of the present disclosure;

[0015] Figure 3 is a diagram showing a signal flow between a terminal and a base station for acquiring a sidelink radio bearer configuration according to an embodiment of the present disclosure;

[0016] Figure 4 is a diagram showing a signal flow when a terminal determines a default side link radio bearer (SLRB) configuration according to an embodiment of the present disclosure;

[0017] Figure 5 is a diagram showing a signal flow when a terminal determines a default SLRB configuration according to an embodiment of the present disclosure;

[0018] Figure 6 is a diagram showing a signal flow when a terminal determines an SLRB configuration according to an embodiment of the present disclosure;

[0019] Fig. 7A is a diagram showing a signal flow when a terminal determines an SLRB configuration according to an embodiment of the present disclosure;

[0020] Figure 7B is a diagram showing a signal flow when a terminal determines an SLRB configuration according to an embodiment of the present disclosure;

[0021] Figure 8 is a diagram showing a signal flow when a terminal determines an SLRB configuration according to an embodiment of the present disclosure;

[0022] Fig. 9 is a diagram showing a signal flow when a terminal determines an SLRB configuration according to an embodiment of the present disclosure;

[0023] Fig.10 is a diagram showing a signal flow when a terminal determines an SLRB configuration according to an embodiment of the present disclosure;

[0024] Fig.11 is a diagram showing a signal flow when a terminal determines an SLRB configuration according to an embodiment of the present disclosure;

[0025] Fig. 12A is a diagram showing a signal flow when a terminal acquires priority information of a V2X flow according to an embodiment of the present disclosure;

[0026] Fig. 12B is a diagram showing a signal flow when a terminal acquires priority information of a V2X flow according to an embodiment of the present disclosure;

[0027] Fig. 12C is a diagram showing a signal flow when a terminal acquires priority information of a V2X flow according to an embodiment of the present disclosure;

[0028] Fig.13A is a diagram showing a signal flow of a terminal acquiring priority information of a V2X flow according to an embodiment of the present disclosure;

[0029] Fig. 13B is a diagram showing a signal flow of a terminal acquiring priority information of a V2X flow according to an embodiment of the present disclosure;

[0030] Fig.14 is a diagram illustrating an operation of a terminal for determining a transmission priority according to an embodiment of the present disclosure;

[0031] Fig.15 is a diagram illustrating an operation of a terminal for determining a transmission priority according to an embodiment of the present disclosure;

[0032] Fig.16 is a block diagram showing an internal structure of a transmitting terminal according to an embodiment of the present disclosure;

[0033] Fig.17 is a block diagram showing an internal structure of a receiving terminal according to an embodiment of the present disclosure; and

[0034] Fig.18 is a block diagram illustrating the internal structure of a base station according to an embodiment of the present invention.

[0035] Throughout the drawings, like reference numerals will be understood to refer to like parts, components and structures. DETAILED DESCRIPTION

[0036] [Best Mode]

[0037] Aspects of the present disclosure address at least the above problems and / or disadvantages and provide at least the advantages described below. Accordingly, one aspect of the present invention provides a method and apparatus for operating a sidelink bearer in a vehicle-to-everything (V2X) system.

[0038] Additional aspects will be set forth in part in the description which follows and, in part, will be obvious from the description, or may be learned by practice of the presented embodiments.

[0039] According to an embodiment of the present disclosure, a communication method of a first sidelink terminal in a wireless communication system is provided. The communication method includes acquiring sidelink radio bearer configuration information, identifying default sidelink radio bearer information in the sidelink radio bearer configuration information, and sending data to a base station or a second sidelink terminal based on the default sidelink radio bearer information.

[0040] The sidelink radio bearer configuration information may be included in a response message to a configuration request message of the first sidelink terminal, included in system information received from a base station, or included in pre-configured configuration information.

[0041] Obtaining the sidelink radio bearer configuration information may include: if the first sidelink terminal is in RRC connected (RRC_CONNECTED) mode, then: the first sidelink terminal requests the sidelink radio bearer configuration information from the base station, and obtains the sidelink radio bearer configuration information through a response message in response to the request.

[0042] Acquiring the sidelink radio bearer configuration information may include, if the first sidelink terminal is in an RRC idle (RRC_IDLE) mode or an RRC inactive (RRC_INACTIVE) mode, acquiring the sidelink radio bearer configuration information through system information received from the base station.

[0043] Acquiring the sidelink radio bearer configuration information may include, if the first sidelink terminal is in an Out-Of-Coverage state, acquiring the sidelink radio bearer configuration information from preconfigured information.

[0044] The communication method may further include acquiring new sidelink radio bearer configuration information during a state transition or a coverage change of the first sidelink terminal, and applying the acquired new sidelink radio bearer configuration information.

[0045] The sidelink radio bearer configuration information may further include priority information for transmission of the sidelink data and the uplink data, wherein the priority information includes a priority threshold.

[0046] Sending data to the base station may be further based on priority information, and sending data to the base station based on the identified default sidelink radio bearer information and the priority information may include: if the uplink data and the sidelink data cannot be sent at the same time, determining whether to send the sidelink data before the uplink data based on a priority threshold, and sending one of the uplink data and the sidelink data based on a determination result of whether to send the sidelink data before the uplink data.

[0047] Determining whether to transmit the sidelink data before the uplink data based on the priority threshold may include determining to transmit the uplink data before the sidelink data when transmission of the uplink data is configured to take priority over transmission of the sidelink data.

[0048] Priority information may be configured for each side link flow, and the uplink data includes uplink data transmitted to a base station connected to the first side link terminal by using a dual connection.

[0049] According to another aspect of the present disclosure, a first sidelink terminal of a wireless communication system is provided. The first sidelink terminal includes a transceiver and a processor coupled to the transceiver, the processor being configured to: obtain sidelink radio bearer configuration information, identify default sidelink radio bearer information in the sidelink radio bearer configuration information, and send data to a base station or a second sidelink terminal based on the default sidelink radio bearer information.

[0050] The sidelink radio bearer configuration information may be included in a response message to a configuration request message of the first sidelink terminal, included in system information received from a base station, or included in pre-configured configuration information.

[0051] The processor may also be configured to: when the first side link terminal is in RRC connected (RRC_CONNECTED) mode, request the side link radio bearer configuration information from the base station by the first side link terminal, and obtain the side link radio bearer configuration information through a response message in response to the request.

[0052] The processor may be further configured to: when the first sidelink terminal is in an RRC idle (RRC_IDLE) mode or an RRC inactive (RRC_INACTIVE) mode, acquire sidelink radio bearer configuration information through system information received from a base station.

[0053] The processor may be further configured to: when the first sidelink terminal is in an Out-Of-Coverage state, obtain the sidelink radio bearer configuration information from pre-configured information.

[0054] The processor may be further configured to acquire new sidelink radio bearer configuration information during a state transition or a coverage change of the first sidelink terminal, and apply the acquired new sidelink radio bearer configuration information.

[0055] The radio bearer configuration information may further include priority information for transmission of the sidelink data and the uplink data, wherein the priority information includes a priority threshold.

[0056] Sending data to the base station is further based on priority information, and the processor can also be configured to: when the uplink data and the sidelink data cannot be sent at the same time, determine whether to transmit the sidelink data before the uplink data based on the priority threshold, and send one of the uplink data and the sidelink data based on the determination.

[0057] The processor may be further configured to: when the uplink data is configured for priority transmission, determine to send the uplink data based on the priority.

[0058] Priority information may be configured for each side link flow, and the uplink data includes uplink data transmitted to a base station connected by using a dual connection to the first side link terminal.

[0059] Other aspects, advantages, and salient features of the disclosure will become apparent to those skilled in the art from the following detailed description, which, taken in conjunction with the accompanying drawings, discloses various embodiments of the disclosure.

[0060] [Invention Mode]

[0061] This application is based on Korean Patent Application No. 10-2019-0079706 filed with the Korean Intellectual Property Office on July 2, 2019, the disclosure of which is incorporated herein by reference in its entirety.

[0062] The following description with reference to the accompanying drawings is provided to assist in a comprehensive understanding of the various embodiments of the present invention as defined by the claims and their equivalents. It includes various specific details to assist in understanding, but these are considered to be exemplary only. Therefore, it will be appreciated by those of ordinary skill in the art that various changes and modifications may be made to the various embodiments described herein without departing from the scope and spirit of the present disclosure. In addition, for the sake of clarity and brevity, descriptions of well-known functions and structures may be omitted.

[0063] The terms and words used in the following description and claims are not limited to the bibliographic meanings, but are merely used by the inventor to enable a clear and consistent understanding of the present disclosure. Therefore, it should be clear to those skilled in the art that the following description of various embodiments of the present disclosure is provided for illustrative purposes only and not for limiting the disclosure defined by the attached claims and their equivalents.

[0064] It is to be understood that the singular forms "a," "an," and "the" include plural referents unless the context clearly dictates otherwise. Thus, for example, reference to "a component surface" includes reference to one or more of such surfaces.

[0065] While describing the embodiments of the present disclosure, descriptions of technologies that are well known in the art and not directly related to the present disclosure are omitted. This is to clearly convey the main points of the present disclosure by omitting unnecessary explanations. The terms used herein are defined in consideration of the functions in the present disclosure, but these terms may vary according to the intentions of users or operators, precedents, etc. Therefore, the terms used herein must be defined based on the meaning of the terms and the descriptions in the full text of the specification.

[0066] For the same reason, some elements in the drawings are exaggerated, omitted or schematically shown. Moreover, the size of each element does not fully reflect the actual size of the element. In the drawings, the same or corresponding elements are represented by the same reference numerals.

[0067] The advantages and features of the present invention and methods of achieving them will become apparent with reference to the embodiments of the present invention described in detail below in conjunction with the accompanying drawings. However, the present disclosure may be embodied in many different forms and should not be construed as limited to the embodiments of the present disclosure described herein; rather, these embodiments of the present disclosure are provided so that the present disclosure is thorough and complete and fully conveys the scope of the present disclosure to those of ordinary skill in the art, and the scope of the present disclosure is limited only by the appended claims. In this specification, the same reference numerals represent the same elements.

[0068] Throughout the disclosure, the expression "at least one of a, b, or c" means only a, only b, only c, both a and b, both a and c, both b and c, all of a, b, and c, or variations thereof.

[0069] Examples of the terminal may include a User Equipment (UE), a Mobile Station (MS), a cellular phone, a smart phone, a computer, a multimedia system capable of performing a communication function, and the like.

[0070] In this disclosure, a controller may also be referred to as a processor.

[0071] Throughout the specification, a layer (or a layer arrangement) may also be referred to as an entity.

[0072] It should be understood that each block and the combination of blocks in the flow chart can be implemented by computer program instructions. Because these computer program instructions can be loaded into the processor of a general-purpose computer, a special-purpose computer or other programmable data processing device, the instructions executed by the processor of the computer or other programmable data processing device generate a device for realizing the function specified in the flow chart frame. Because these computer program instructions can also be stored in a computer-available or computer-readable memory, which can guide the computer or other programmable data processing device to work in a particular way, the instructions stored in the computer-available or computer-readable memory can produce a product including an instruction device for realizing the function specified in the flow chart frame. Because the computer program instructions can also be loaded onto a computer or other programmable data processing device, a series of operations can be performed on a computer or other programmable device to generate a computer-implemented process, and therefore the instructions executed on a computer or other programmable device can provide an operation for realizing the function specified in the flow chart frame.

[0073] In addition, each block of the flow chart may represent a module, segment or portion of code, which includes one or more executable instructions for implementing a specified logical function. It should also be noted that in some alternative implementations, the functions recorded in the blocks may not occur in the order shown. For example, two blocks shown in succession may actually be executed substantially simultaneously, or the blocks may sometimes be executed in reverse order, depending on the functions involved.

[0074] The term "~unit" used in the embodiments of the present disclosure refers to a software or hardware component that performs certain tasks, such as a field programmable gate array (FPGA) or an application specific integrated circuit (ASIC). However, "~unit" is not meant to be limited to software or hardware. The term "unit" can be configured to be in an addressable storage medium or configured to operate one or more processors. Therefore, for example, "~unit" may include components, such as software components, object-oriented software components, class components, and task components, processes, functions, attributes, procedures, subroutines, program code segments, drivers, firmware, microcodes, circuits, data, databases, data structures, tables, arrays, and variables. The functions provided in components and "~units" can be combined into fewer components and "~units", or further separated into additional components and "~units". In addition, components and "~units" can be implemented to operate one or more central processing units (CPUs) in a device or a secure multimedia card. In addition, in the embodiments of the present disclosure, a unit may include one or more processors.

[0075] Although the embodiments will be described in detail mainly based on the new RAN (NR) and the packet core (e.g., 5G system, 5G core network or next generation (NG) core), where the new RAN (NR) is a wireless access network according to the fifth generation (5G) network standard defined by the Third Generation Partnership Project (3GPP) which is a mobile communication standard group, and the packet core is a core network, the main points of the present disclosure can also be applied to other communication systems with similar technical backgrounds, with some modifications without departing from the scope of the present disclosure, and this can be determined by ordinary technicians in the field.

[0076] Hereinafter, for the convenience of description, some terms and names defined in the 3rd Generation Partnership Project Long Term Evolution (3GPP LTE) standard (e.g., a standard for 5G, New Radio (NR), LTE, or similar systems) may be used. However, the present disclosure may not be limited to these terms and names, and may also be applied to systems that comply with other standards.

[0077] Hereinafter, for the convenience of explanation, the terms indicating connection nodes, the terms indicating network entities, the terms indicating messages, the terms indicating interfaces between network entities, and the terms indicating various identification information used in the following description are exemplified. Therefore, the present disclosure is not limited to the terms to be described later, but other terms indicating objects having the same technical meaning may be used.

[0078] Hereinafter, a base station is an entity that performs resource allocation for a terminal, and may include at least one of a gNode B, an eNode B, a Node B, a base station (BS), a radio access unit, a base station controller, or a node on a network. A terminal may include a user equipment (UE), a mobile station (MS), a cellular phone, a smart phone, a computer, or a multimedia system capable of performing a communication function. However, the present disclosure is not limited to the above embodiments.

[0079] In particular, the present disclosure may be applied to 3GPP NR (5G mobile communication standard). In addition, the present disclosure may be applied to smart services based on 5G communication technology and Internet of Things (IoT) related technologies (e.g., smart homes, smart buildings, smart cities, smart cars or connected cars, health care, digital education, retail business, security and safety-related services). In the present disclosure, for ease of explanation, evolved Node B (eNB) may be used interchangeably with next-generation Node B (gNB). That is, a base station described as an eNB may refer to a gNB. In addition, the term "terminal" may refer to other wireless communication devices as well as mobile phones, NB-IoT devices, and sensors.

[0080] In order to meet the growing demand for wireless data services after the commercialization of the fourth generation (4G) communication system, efforts have been made to develop an improved 5G new radio (NR) communication system. In order to achieve high data transmission rates, 5G communication systems are designed to support millimeter wave (mmWave) bands (e.g., 28GHz). In order to reduce propagation path losses and increase transmission distances in millimeter wave bands, in 5G communication systems, technologies such as beamforming, massive multiple input multiple output (MIMO), full dimensional MIMO (FD-MIMO), array antennas, analog beamforming, and massive antennas are being discussed. In addition, unlike LTE systems, 5G communication systems support various subcarrier spacings (SCS) such as 15kHz, 30kHz, 60kHz, and 120kHz, and encode physical control channels by using polarity coding, and encode physical data channels by using low-density parity check (LDPC). In addition, as a waveform for uplink transmission, not only cyclic prefix-orthogonal frequency division multiplexing (CP-OFDM) but also discrete Fourier transform-spread spectrum-orthogonal frequency division multiplexing (DFT-S-OFDM) is used. In addition, the NR system can also support hybrid automatic repeat request (HARQ) retransmission based on a code block group (CBG) in which multiple code blocks (CBs) are grouped.

[0081] In order to improve the network of the system, in the 5G communication system, technologies such as evolved small cells, advanced small cells, cloud radio access networks (cloud RAN), ultra-dense networks, device-to-device (D2D) communication, wireless backhaul, vehicle-to-everything (V2X) networks, collaborative communications, coordinated multi-point (CoMP), and interference cancellation are being developed.

[0082] The Internet is evolving from a human-centered connected network where humans create and consume information to an Internet of Things (IoT) network through which distributed elements such as objects exchange and process information. Internet of Everything (IoE) technology is a technology in which IoT technology and big data processing technology are combined through connection with cloud servers. In order to realize IoT, technical elements such as sensing technology, wired / wireless communication and network infrastructure, service interface technology and security technology are required, so technologies for inter-object connection such as sensor networks, machine-to-machine (M2M) communication or machine type communication (MTC) have been studied recently. In the IoT environment, intelligent Internet technology (IT) services can be provided that collect and analyze data generated by connected objects and create new value in human life. IoT can be applied to fields such as smart homes, smart buildings, smart cities, smart cars or connected cars, smart grids, healthcare, smart home appliances and advanced medical services through the fusion and integration of existing information technology (IT) and various industries.

[0083] Various attempts have been made to apply the 5G communication system to the IoT network. For example, technologies such as sensor networks, M2M communications, or MTC are implemented by 5G communication technologies such as beamforming, MIMO, or array antennas. The application of cloud RAN as a big data processing technology can also serve as an example of the fusion of 5G technology and IOT technology. In this way, a variety of services can be provided to users in the communication system, and in order to provide a variety of services to users, a method for providing each service at the same time interval according to characteristics, and a device using the method are required. Various services provided by the 5G communication system are being studied, and one of the various services is a service that meets the requirements of low latency and high reliability.

[0084] In vehicle communications, standardization of V2X technology based on a device-to-device (D2D) communication structure in LTE systems has been completed in 3GPP Release 14 and Release 15, and efforts are being made to develop V2X technology based on 5G NR. NR V2X supports unicast communication, groupcast (or multicast) communication, and broadcast communication between terminals. In addition, unlike LTE V2X, which is designed to send and receive basic safety information required for road driving of vehicles, NR V2X is designed to provide more improved services such as planning, advanced driving, extended sensors, and remote driving.

[0085] A side link (SL) refers to a link for sending / receiving signals between terminals and can be used interchangeably with a PC5 interface. In the following, a base station that performs resource allocation for a terminal may be a base station that supports V2X communication and general cellular communication, or a base station that supports only V2X communication. That is, examples of base stations may include NR base stations (gNB), LTE base stations (eNB), and roadside units (RSU). Examples of terminals may include general user equipment, mobile stations, vehicles that support vehicle-to-vehicle (V2V) communication, vehicles that support vehicle-to-pedestrian (V2P) communication, pedestrians' mobile phones (e.g., smart phones), vehicles that support vehicle-to-network (V2N) communication, vehicles that support vehicle-to-infrastructure (V2I) communication, RSUs with terminal functions, RSUs with base station functions, and RSUs with part of base station functions and part of terminal functions.

[0086] The base station and the terminal are connected to each other through the Uu interface. Uplink (UL) refers to a wireless link for sending data or control signals from the terminal to the base station, and downlink (DL) refers to a wireless link for sending data or control signals from the base station to the terminal. In addition, in the following, higher layer signaling may refer to radio resource control (RRC) signaling, and may include system information blocks and master information blocks.

[0087] The present disclosure provides a V2X system, and more specifically, provides a method and apparatus for operating a sidelink bearer for performing data transmission in a process in which a vehicle terminal supporting V2X sends / receives data to / from another vehicle terminal or a pedestrian mobile terminal by using a sidelink.

[0088] The present disclosure provides a method for configuring a sidelink radio bearer (SLRB) corresponding to a V2X flow of a wireless communication system, the method comprising: sending, by a terminal, service quality (QoS) information of the requested V2X flow to a base station, sending, by the base station, sidelink radio bearer configuration information based on the QoS information of the V2X flow, determining, by the terminal, a sidelink radio bearer configuration of the V2X flow, determining, by the terminal, a default sidelink radio bearer configuration of the V2X flow, exchanging, by the terminal, the sidelink radio bearer configuration information of the V2X flow with a counterpart terminal, acquiring, by the terminal, priority information in the sidelink radio bearer configuration information of the V2X flow, configuring, by the base station, the priority information in the sidelink radio bearer configuration of the V2X flow, and determining, by the terminal, a priority between sidelink transmission and uplink transmission based on the priority information of the V2X flow.

[0089] Embodiments of the present disclosure will now be described in detail with reference to the accompanying drawings.

[0090] Figure 1A 2 is a diagram showing the structure of wireless time-frequency resources of an NR system according to an embodiment of the present disclosure.

[0091] Reference Figure 1A , in the wireless resource area, the horizontal axis represents the time domain and the vertical axis represents the frequency domain. In the time domain, the minimum transmission unit is an OFDM symbol or a DFT-S-OFDM symbol, and Nsymb OFDM or DFT-S-OFDM symbols 130 may constitute a time slot 105. Unlike a time slot, in the NR system, the length of a subframe may be 1.0 ms and the length of a radio frame 100 may be 10 ms. In the frequency domain, the minimum transmission unit is a subcarrier, and the bandwidth of the entire system transmission band may include a total of NBW subcarriers 125. However, the above specific values ​​may be variably applied depending on the system.

[0092] The basic unit in the time-frequency resource domain is a resource element (RE) 110, and can be defined by an OFDM symbol index (or DFT-S-OFDM symbol index) and a subcarrier index. A resource block (RB) 115 is defined by NRB consecutive subcarriers 120 in the frequency domain. Typically, the minimum transmission unit of data can be an RB, and in an NR system, typically Nsymb=14 and NRB=12. Although the structure of wireless time-frequency resources is applied to the Uu interface, a similar structure can also be applied to sidelink communications. However, the present disclosure is not limited to the above embodiments.

[0093] Figure 1B is a diagram illustrating data transmission in an NR system according to an embodiment of the present disclosure.

[0094] Reference Figure 1B , the base station 140 may send (operation 150) downlink control information (DCI) for scheduling DL data transmission (which may be used interchangeably with DL allocation or DL ​​grant) to the terminal 142 through a physical downlink control channel (PDCCH). The DCI may be DCI format 1_0 or 1_1, and the DCI format 1_1 may include information as shown in Table 1. However, the present disclosure is not limited to the following embodiments.

[0095] [Table 1]

[0096]

[0097]

[0098] The DCI may be transmitted via a physical downlink control channel (PDCCH) by channel coding and modulation, and a cyclic redundancy check (CRC) may be attached to the DCI, and the DCI may be scrambled by a radio network temporary identifier (RNTI) corresponding to a terminal identity. When receiving the DCI transmitted through the PDCCH, the terminal 142 checks the CRC by using the RNTI corresponding to the terminal 142, and when the confirmation result of the CRC is correct, the terminal 142 may determine that the DCI is transmitted to the terminal 142. A demodulation reference signal (DMRS) for the PDCCH may be included in the PDCCH, and the terminal 142 may estimate the channel experienced by the PDCCH by using the DMRS and may receive the DCI.

[0099] Based on the DCI, the base station 140 may transmit (operation 155) DL data to the terminal 142 through a physical downlink shared channel (PDSCH). DMRS may be included in the PDSCH, and the terminal 142 may estimate the channel experienced by the PDSCH by using the DMRS and may receive the DL data. The terminal 142 may attempt to decode the DL data, and when the data decoding is successful, the terminal 142 may transmit information indicating the decoding success (acknowledgement (ACK) information) to the base station 140 so that the base station 140 transmits new data, and when the data decoding fails, the terminal 142 may transmit information indicating the decoding failure (negative acknowledgement (NACK) information) to the base station 140 so that the base station 140 retransmits the corresponding data in the physical layer. ACK / NACK information as feedback information may be transmitted (operation 160) through a physical uplink control channel (PUCCH) or a physical uplink shared channel (PUSCH). When feedback information of data is sent through PUCCH, PUCCH resources can be determined by DCI for scheduling data and higher layer signaling, and the PUCCH resources can be distinguished by at least one of time, frequency or code used for feedback information transmission. Specifically, the PUCCH resources can be resources in which a PDCCH resource set is configured through high layer signaling, and one of the PUCCH resources can be indicated by DCI.

[0100] When the terminal 142 sends NACK information as feedback information, the base station 140 may send DCI for scheduling retransmission data, and may retransmit the data according to the schedule (operation 165). Through hybrid automatic repeat request (HARQ), the terminal 142 may improve data reception performance by combining the retransmitted data with the data that failed to be decoded.

[0101] In addition, the base station 140 may transmit (operation 170) DCI for scheduling UL data transmission (which may be used interchangeably with UL grant) to the terminal 142 via the PDCCH. The DCI may be DCI format 0_0 or 0_1, and the DCI format 0_1 ​​may include information as shown in Table 2. However, the present disclosure is not limited to the following embodiments.

[0102] [Table 2]

[0103]

[0104]

[0105]

[0106] The terminal 142 receiving the DCI may transmit (operation 175) UL data through the PUSCH according to the DCI. In this case, the DMRS may be included in the PUSCH, and the base station 140 estimates the channel experienced by the PUSCH by using the DMRS and receives the UL data. The base station 140 may attempt to decode the UL data, and when the data decoding fails, the base station 140 may generate a DCI for scheduling retransmission of the UL data, and may transmit (operation 180) the DCI to the terminal 142 through the PDCCH. The terminal 142 may identify the DCI for scheduling retransmission by using a new data indicator (NDI) and the HARQ process number of the DCI for scheduling retransmission, and may retransmit (operation 185) the UL data by using the scheduled resources.

[0107] Although reference Figure 1B The described data scheduling and data retransmission are applied to the Uu interface, and the data scheduling and data retransmission can also be applied to the side link communication.

[0108] Figure 2 is a diagram illustrating V2X communication performed through a side link according to an embodiment of the present disclosure.

[0109] Reference Figure 2 , the unicast communication group 200 corresponds to a case where the transmitting terminal UE1 202 or UE2 204 and the receiving terminal UE2 204 or UE1 202 perform one-to-one communication.

[0110] In addition, a groupcast or multicast communication group 210 corresponds to a case where a transmitting terminal and a receiving terminal perform one-to-many communication. In a groupcast, terminals UE1, UE2, and UE3 may form a group A 212 and may perform a groupcast communication, and terminals UE4, UE5, UE6, and UE7 may form a group B 214 and may perform a groupcast communication. Each terminal may perform a groupcast communication within the group to which the terminal belongs, and may also perform communication with terminals in different groups by using a unicast, groupcast, or broadcast communication method. Although in Figure 2 Two groups are formed, but the present disclosure is not limited thereto.

[0111] Despite Figure 2 Not shown, the V2X terminal may perform broadcast communication. The term "broadcast communication" may refer to a situation where all V2X terminals receive data and control information sent by a V2X transmitting terminal through a side link. For example, in the communication group 210, when the terminal UE1 is a transmitting terminal for broadcasting, other terminals UE2, UE3, UE4, UE5, UE6, and UE7 may receive data and control information sent by the terminal UE1.

[0112] In NR V2X, unlike in LTE V2X, a transmission type that supports a vehicle terminal sending data to only one specific terminal by unicast and a transmission type that supports a vehicle terminal sending data to multiple specific terminals by multicast can be considered. For example, when considering the following service scenario, unicast and multicast can be effectively used: the service scenario is, for example, a technology in a vehicle group that connects two or more vehicles traveling together through a network. Specifically, a leading terminal in a group connected by planning may need unicast communication for controlling one specific terminal, and may need multicast communication for a group of multiple specific terminals at the same time.

[0113] There may be two resource allocation modes as follows in the V2X system. The first resource allocation mode is a scheduled resource allocation method in which the base station allocates resources for sidelink transmission to the RRC-connected terminal by using dedicated scheduling. In NR and LTE systems, mode 1 and mode 3 may correspond to the first resource allocation mode. Because the base station can manage the sidelink resources, the scheduled resource allocation method is effective for interference management and resource pool management (dynamic allocation and / or semi-persistent transmission). When there is data to be sent to other terminals, the RRC-connected terminal may send information indicating the presence of data to be sent to other terminals to the base station by using an RRC message or a media access control (MAC) control element (CE). The RRC message may be sidelink terminal information (SidelinkUEInformation) and terminal assistance information (UEAssistanceInformation), and the MAC CE may include a buffer status report (BSR) MAC CE, which includes at least one of an indicator indicating that the report is a BSR for V2X communication or information about the size of data buffered for sidelink communication, but the present disclosure is not limited to the above examples.

[0114] The second resource allocation mode is a UE autonomous resource selection method, in which the base station provides the terminal with a side link transmission / reception resource pool for V2X by using system information or an RRC message (e.g., an RRC reconfiguration message or a PC5-RRC message), and the terminal selects the resource pool according to the determined rule. In NR and LTE systems, mode 2 and mode 4 may correspond to the second resource allocation mode. The UE autonomous resource selection method may correspond to at least one of the following resource allocation methods. However, the present disclosure is not limited to the following embodiments.

[0115] -UE autonomously selects sidelink resources for transmission

[0116] -UE assists in sidelink resource selection for other UEs

[0117] -UE is configured with NR configured grants for sidelink transmission

[0118] -UE schedules sidelink transmissions of other UEs

[0119] According to an embodiment of the present disclosure, examples of a resource selection method of a terminal may include an area mapping method, a sensing-based resource selection method, and a random selection method. However, the present disclosure is not limited to the above-mentioned embodiments.

[0120] In addition, even when the terminal is within the coverage of the base station, resource allocation or resource selection may not be performed in the scheduled resource allocation mode or the UE autonomous resource selection mode, and when resource allocation or resource selection may not be performed, the terminal can perform V2X side link communication through a preconfigured side link transmit / receive resource pool.

[0121] According to an embodiment of the present disclosure, in a broadcast-based sidelink communication based on LTE, a radio bearer for packet transmission and a radio bearer for packet reception can be arbitrarily configured at a transmitting terminal and a receiving terminal, respectively. In a sidelink communication based on NR, the sidelink radio bearer can be configured by a base station or a system. When it is determined that the terminal is within the coverage of the base station, the terminal can obtain the sidelink radio bearer configuration from the base station or the system. When it is determined that the terminal is not within the coverage of the base station, the terminal can obtain a pre-configured sidelink radio bearer configuration from the base station or the system.

[0122] According to an embodiment of the present disclosure, when a base station or system configures a sidelink radio bearer, the base station or system may use QoS information that may correspond to the sidelink radio bearer. The QoS information corresponding to the sidelink radio bearer may be provided from a terminal or an application server.

[0123] The situation where it is determined that the terminal may not be able to obtain the sidelink radio bearer configuration from the base station or the system will be described through various embodiments of the present disclosure. The situation where it is determined that the terminal may not be able to obtain the sidelink radio bearer configuration may include at least one of the following situations: the situation where the terminal provides QoS information to the base station but it is determined that the terminal may not be able to obtain the corresponding sidelink radio bearer configuration from the base station, the situation where the terminal provides QoS information to the base station but it is determined that the terminal may not be able to obtain the corresponding sidelink radio bearer configuration from the base station within a certain period of time, or the situation where it is determined that the terminal cannot obtain the pre-configured sidelink radio bearer information. However, the present disclosure is not limited to the above embodiments.

[0124] Figure 3 A signal flow between a terminal and a base station for acquiring a sidelink radio bearer configuration according to an embodiment of the present disclosure is shown.

[0125] Reference Figure 3In operation 302, the UE 300 may identify (or determine or discern) a need for a side link radio bearer (SLRB) configuration for a V2X flow. The need for SLRB configuration in operation 302 may correspond to at least one of the following cases: a case where a new packet is determined to have been generated in a V2X application, a case where a new V2X application is determined to have been generated, a case where a new V2X flow is determined to have occurred, or a case where a new V2X flow is determined to have occurred, an already acquired SLRB configuration may not be used, and a new SLRB configuration is required. However, the present disclosure is not limited to the above-described embodiments.

[0126] When it is determined in operation 302 that the SLRB configuration of the V2X flow that has been acquired can be used, the UE 300 can use the pre-configured sidelink radio bearer of the V2X flow. When it is determined that a new SLRB configuration is required, in operation 304, the UE 300 can send a SLRB configuration request message including QoS information of the V2X flow to the base station 350. According to an embodiment of the present disclosure, the QoS information may include at least one of a 5G QoS identifier (5QI), a ProSe QoS identifier (PQI), a ProSe flow identifier (PFI), an application identifier, a service identifier, a broadcast type, a destination identifier, or a frequency identifier.

[0127] In operation 306 , the base station 350 may determine the SLRB configuration corresponding to the QoS information of the V2X flow and may send a response message to the UE 300 .

[0128] In operation 308, the UE 300 may acquire SLRB configuration information of the V2X flow requested in operation 304 through the information received in operation 306. The SLRB configuration information acquired in operation 308 may include information on at least one sidelink radio bearer for transmitting / receiving a V2X packet of the VX flow for requesting QoS information.

[0129] According to an embodiment of the present disclosure, when UE 300 performs unicast-based sidelink data transmission / reception with another UE, UE 300 may use the sidelink radio bearer acquired in operation 308. In addition, when UE 300 performs groupcast-based sidelink data transmission / reception with a specific group of UEs, UE 300 may use the sidelink radio bearer acquired in operation 308. In addition, when UE 300 performs broadcast-based sidelink data transmission / reception, UE 300 may use the sidelink radio bearer acquired in operation 308.

[0130] Figure 4 The signal flow when the terminal determines the default SLRB configuration according to an embodiment of the present disclosure is shown.

[0131] Reference Figure 4 In operation 402, the UE 400 may identify (or determine or discern) a need for SLRB configuration of the V2X flow. The need for SLRB configuration in operation 402 may correspond to at least one of the following cases: a case where a new packet is determined to have been generated in a V2X application, a case where a new V2X application is determined to have been generated, a case where a new V2X flow is determined to have occurred, or a case where a new V2X flow is determined to have occurred, an already acquired SLRB configuration may not be used, and a new SLRB configuration is required. However, the present disclosure is not limited to the above-mentioned embodiments.

[0132] When it is determined in operation 402 that the SLRB configuration of the V2X flow that has been acquired can be used, the UE 400 can use the sidelink radio bearer of the pre-configured V2X flow. When it is determined that a new SLRB configuration is required, in operation 404, the UE 400 can send a SLRB configuration request message including QoS information of the V2X flow to the base station 450. According to an embodiment of the present disclosure, the QoS information may include at least one of a 5G QoS identifier (5QI), a ProSe QoS identifier (PQI), a ProSe flow identifier (PFI), an application identifier, a service identifier, a broadcast type, a destination identifier, or a frequency identifier. However, the present disclosure is not limited to the above embodiments.

[0133] In operation 406, the UE 400 may determine that the SLRB configuration information of the V2X flow requested in operation 404 has not been acquired. For example, when the SLRB configuration information of the V2X flow is not acquired from the base station 450 within a certain time (e.g., until the timer x expires) after the sidelink radio bearer request message is sent in operation 404, the UE 400 may determine that the SLRB configuration information is not acquired.

[0134] In operation 408, the UE 400 may determine to use a default SLRB configuration for the V2X flow.

[0135] According to an embodiment of the present disclosure, when the UE 400 performs unicast-based sidelink data transmission / reception with another UE, the UE 400 may use the default sidelink radio bearer acquired in operation 408. In addition, when the UE 400 performs groupcast-based sidelink data transmission / reception with a specific group of UEs, the UE 400 may use the default sidelink radio bearer acquired in operation 408. In addition, when the UE 400 performs broadcast-based sidelink data transmission / reception, the UE 400 may use the default sidelink radio bearer acquired in operation 408.

[0136] According to an embodiment of the present disclosure, when it is determined that UE 400 receives SLRB configuration information of a V2X flow from a base station 450 while using a default sidelink radio bearer, UE 400 can stop using the default sidelink radio bearer of the V2X flow and can perform data transmission / reception by using the sidelink radio bearer received from the base station 450.

[0137] In addition, according to an embodiment of the present disclosure, if UE 400 is performing unicast-based sidelink data transmission / reception with another UE, and the other UE must know the change of the sidelink radio bearer, a sidelink radio bearer change procedure between UE 400 and the other UE can be performed. After the other UE sends a confirmation message for the sidelink radio bearer change procedure to UE 400, UE 400 and the other UE can perform unicast-based sidelink data transmission / reception by using the changed sidelink radio bearer.

[0138] According to an embodiment of the present disclosure, a default sidelink radio bearer may be configured by using at least one method of Table 3. However, the present disclosure is not limited to the following embodiments.

[0139] [Table 3]

[0140]

[0141] The configuration parameters of the default sidelink radio bearer may include at least one of the following examples. However, the present disclosure is not limited to the following embodiments.

[0142] -TX parameters, synchronization parameters, resource pools, priorities, V2X flow and TX parameter mapping, V2X flow and RX parameter mapping, resource allocation parameters (mode 1 resource allocation), and resource selection parameters (mode 2 resource allocation)

[0143] Figure 5 The signal flow when the terminal determines the default SLRB configuration according to an embodiment of the present disclosure is shown.

[0144] Reference Figure 5 In operation 502, the UE 500 may identify (or determine or discern) a need for SLRB configuration of the V2X flow. The need for SLRB configuration in operation 502 may correspond to at least one of the following cases: a case where a new packet is determined to have been generated in a V2X application, a case where a new V2X application is determined to have been generated, a case where a new V2X flow is determined to have occurred, or a case where a new V2X flow is determined to have occurred, an already acquired SLRB configuration may not be used, and a new SLRB configuration is required. However, the present disclosure is not limited to the above-mentioned embodiments.

[0145] When it is determined in operation 502 that the SLRB configuration of the V2X flow that has been acquired can be used, the UE 500 can use the sidelink radio bearer of the pre-configured V2X flow. When it is determined that a new SLRB configuration is required, in operation 504, the UE 500 can send a SLRB configuration request message including QoS information of the V2X flow to the base station 550. According to an embodiment of the present disclosure, the QoS information may include at least one of a 5G QoS identifier (5QI), a ProSe QoS identifier (PQI), a ProSe flow identifier (PFI), an application identifier, a service identifier, a broadcast type, a destination identifier, or a frequency identifier. However, the present disclosure is not limited to the above embodiments.

[0146] In operation 506, the base station 550 may send a response message to the request of the UE 500. According to an embodiment of the present disclosure, the response message of operation 506 may not include the SLRB configuration information for the V2X flow requested by the UE 500. In operation 508, the UE 500 may determine that the SLRB configuration information of the V2X flow requested in operation 504 has not been acquired. The case where the UE 500 determines that the SLRB configuration information of the requested V2X flow has not been acquired may correspond to at least one of a case where all the SLRB configuration information of the V2X flow requested in operation 504 is not received or a case where some of the SLRB configuration information of the V2X flow requested in operation 504 is not received. However, the present disclosure is not limited to the above-mentioned embodiments.

[0147] In operation 510, when it is determined that the SLRB configuration information is not received, the UE 500 may determine to use a default SLRB configuration for the V2X flow.

[0148] According to an embodiment of the present disclosure, the response message of operation 506 may be a message indicating the use of the default sidelink radio bearer as the SLRB configuration information of the V2X flow requested by the UE 500. The UE 500 may determine that the default sidelink radio bearer is configured as the SLRB configuration information of the V2X flow requested in operation 504, and may determine to use the default sidelink radio bearer for the V2X flow as in operation 510.

[0149] According to an embodiment of the present disclosure, when UE 500 performs unicast-based sidelink data transmission / reception with another UE, UE 500 may use the default sidelink radio bearer acquired in operation 510. In addition, when UE 500 performs groupcast-based sidelink data transmission / reception with a specific group of UEs, UE 500 may use the default sidelink radio bearer acquired in operation 510. In addition, when UE 500 performs broadcast-based sidelink data transmission / reception, UE 500 may use the default sidelink radio bearer acquired in operation 510.

[0150] According to an embodiment of the present disclosure, when it is determined that UE 500 receives SLRB configuration information of a V2X flow from a base station 550 while using a default sidelink radio bearer, UE 500 can stop using the default sidelink radio bearer of the V2X flow and can perform data transmission / reception by using the sidelink radio bearer received from the base station 550.

[0151] In addition, according to an embodiment of the present disclosure, when UE 500 is performing unicast-based sidelink data transmission / reception with another UE and the other UE must be aware of the change of the sidelink radio bearer, a sidelink radio bearer change procedure between UE 500 and the other UE can be performed. After the other UE sends a confirmation message for the sidelink radio bearer change procedure to UE 500, UE 500 and the other UE can perform unicast-based sidelink data transmission / reception by using the changed sidelink radio bearer.

[0152] Figure 6 The signal flow when the terminal determines the SLRB configuration according to an embodiment of the present disclosure is shown.

[0153] Reference Figure 6 In operation 602, the UE 600 may identify (or determine or discern) a need for SLRB configuration of the V2X flow. The need for SLRB configuration in operation 602 may correspond to at least one of the following cases: a case where a new packet is determined to have been generated in a V2X application, a case where a new V2X application is determined to have been generated, a case where a new V2X flow is determined to have occurred, or a case where a new V2X flow is determined to have occurred, an already acquired SLRB configuration may not be used, and a new SLRB configuration is required. However, the present disclosure is not limited to the above embodiments.

[0154] When it is determined in operation 602 that the SLRB configuration of the V2X flow that has been acquired can be used, the UE 600 can use the sidelink radio bearer of the preconfigured V2X flow. When it is determined that a new SLRB configuration is required, in operation 604, the UE 600 can obtain the SLRB configuration information of the V2X flow sent by the base station 650. The SLRB configuration information may include an SLRB configuration corresponding to the QoS information of the V2X flow. According to an embodiment of the present disclosure, the QoS information may include at least one of a 5G QoS identifier (5QI), a ProSe QoS identifier (PQI), a ProSe flow identifier (PFI), an application identifier, a service identifier, a broadcast type, a destination identifier, or a frequency identifier. However, the present disclosure is not limited to the above embodiments.

[0155] According to an embodiment of the present disclosure, SLRB configuration information corresponding to QoS information of a V2X flow may be included in a system information block (SIB) message transmitted by the base station 650. In operation 606, the UE 600 may acquire SLRB configuration information of the V2X flow requested by the UE 600 through the information received in operation 604. The SLRB configuration information acquired in operation 606 may include information about at least one sidelink radio bearer for transmitting / receiving a V2X packet of the V2X flow for requesting QoS information.

[0156] According to an embodiment of the present disclosure, when the UE 600 performs unicast-based sidelink data transmission / reception with another UE, the UE 600 may use the sidelink radio bearer acquired in operation 606. In addition, when the UE 600 performs multicast sidelink data transmission / reception with a specific group of UEs, the UE 600 may use the sidelink radio bearer acquired in operation 606. In addition, when the UE 600 performs broadcast-based sidelink data transmission / reception, the UE 600 may use the sidelink radio bearer acquired in operation 606.

[0157] Fig. 7A The signal flow when the terminal determines the SLRB configuration according to an embodiment of the present disclosure is shown, and Figure 7B A signal flow when a terminal determines an SLRB configuration according to an embodiment of the present disclosure is shown.

[0158] Reference Fig. 7A In operation 702, the UE 700 may identify (or determine or discern) a need for SLRB configuration of the V2X flow. The need for SLRB configuration in operation 702 may correspond to at least one of the following cases: a case where a new packet is determined to have been generated in a V2X application, a case where a new V2X application is determined to have been generated, a case where a new V2X flow is determined to have occurred, or a case where a new V2X flow is determined to have occurred, an already acquired SLRB configuration may not be used, and a new SLRB configuration is required. However, the present disclosure is not limited to the above embodiments.

[0159] When it is determined in operation 702 that the SLRB configuration of the V2X flow that has been acquired can be used, the UE 700 can use the sidelink radio bearer of the preconfigured V2X flow. When it is determined that a new SLRB configuration is required, in operation 704, the UE 700 can determine that the SLRB configuration information for the V2X flow transmitted by the base station 750 has not been acquired. When it is determined in operation 704 that the SLRB configuration information of the V2X flow has not been acquired from the base station 750 within a certain time (for example, until the timer x expires), the UE 700 can determine that the SLRB configuration information has not been acquired. For example, when a SIB message including configuration information required for V2X communication has not been received from the base station 750, the UE 700 can determine that the SLRB configuration information has not been acquired.

[0160] According to an embodiment of the present invention, the SLRB configuration information may include a SLRB configuration corresponding to the QoS information of the V2X flow. The QoS information may include at least one of a 5G QoS identifier (5QI), a ProSe QoS identifier (PQI), a ProSe flow identifier (PFI), an application identifier, a service identifier, a broadcast type, a destination identifier, or a frequency identifier.

[0161] In operation 706, the UE 700 may determine to use a default SLRB configuration for the V2X flow.

[0162] According to an embodiment of the present disclosure, when the UE 700 performs unicast-based sidelink data transmission / reception with another UE, the UE 700 may use the default sidelink radio bearer acquired in operation 706. In addition, when the UE 700 performs groupcast-based sidelink data transmission / reception with a specific group of UEs, the UE 700 may use the default sidelink radio bearer acquired in operation 706. In addition, when the UE 700 performs broadcast-based sidelink data transmission / reception, the UE 700 may use the default sidelink radio bearer acquired in operation 706. The configuration information of the default sidelink radio bearer may include Table 3.

[0163] According to an embodiment of the present disclosure, when it is determined that UE 700 receives a SIB message including SLRB configuration information of a V2X flow from a base station 750 while using a default sidelink radio bearer, UE 700 can stop using the default sidelink radio bearer of the V2X flow and can perform data transmission / reception by using the sidelink radio bearer received from the base station 750.

[0164] According to an embodiment of the present disclosure, when UE 700 is performing unicast-based sidelink data transmission / reception with another UE and the other UE must be aware of the change of the sidelink radio bearer, a sidelink radio bearer change procedure between UE 700 and the other UE may be performed. After the other UE sends a confirmation message for the sidelink radio bearer change procedure to UE 700, UE 700 and the other UE may perform unicast-based sidelink data transmission / reception by using the changed sidelink radio bearer.

[0165] In addition, according to an embodiment of the present disclosure, when the UE 700 determines that the SIB message including the configuration information required for V2X communication is not received from the base station 750 as in operation 704, the UE 700 may request the base station 750 to send the SIB message including the configuration information required for V2X communication, which will refer to Figure 7B Describe in more detail.

[0166] Reference Figure 7B In operation 752, the UE 700 may identify (or determine or discern) a need for SLRB configuration of the V2X flow. The need for SLRB configuration in operation 752 may correspond to at least one of the following cases: a case where a new packet is determined to have been generated in a V2X application, a case where a new V2X application is determined to have been generated, a case where a new V2X flow is determined to have occurred, or a case where a new V2X flow is determined to have occurred, an already acquired SLRB configuration may not be used, and a new SLRB configuration is required. However, the present disclosure is not limited to the above-mentioned embodiments.

[0167] When it is determined in operation 752 that the SLRB configuration of the V2X flow that has been acquired can be used, the UE 700 can use the sidelink radio bearer of the preconfigured V2X flow. When it is determined that a new SLRB configuration is required, in operation 754, the UE 700 can determine that a SIB message including configuration information required for V2X communication is not received from the base station 750, and can determine that the SLRB configuration information of the V2X flow transmitted by the base station 750 is not acquired.

[0168] According to an embodiment of the present invention, the SLBR configuration information may include a SLRB configuration corresponding to the QoS information of the V2X flow. In addition, the QoS information may include at least one of a 5G QoS identifier (5QI), a ProSe QoS identifier (PQI), a ProSe flow identifier (PFI), an application identifier, a service identifier, a broadcast type, a destination identifier, or a frequency identifier. However, the present disclosure is not limited to the above embodiments.

[0169] In operation 756, the UE 700 may request the base station 750 to transmit a SIB message including configuration information required for V2X communication. In operation 758, the base station 750 may transmit a message including V2X configuration information to the UE 700 in response to the request of the UE 700.

[0170] In operation 760, the UE 700 may determine whether the V2X configuration information received in operation 758 includes the SLRB configuration information of the requested V2X flow. When it is determined that the SLRB configuration information of the requested V2X flow is received, the UE 700 may perform V2X packet transmission / reception by using the SLRB configuration information. The SLRB configuration information received from the base station 750 may include at least one of a general SLRB configuration or a default SLRB configuration. However, the present disclosure is not limited to the above-mentioned embodiments.

[0171] According to an embodiment of the present disclosure, the default SLRB configuration may refer to an SLRB configuration preconfigured when the UE 700 is connected to the network, and the general SLRB configuration may refer to the configuration of a sidelink radio bearer other than the default sidelink radio bearer, and may refer to an SLRB configuration acquired through signaling from the base station 750. For example, it can be assumed that the information shown in Table 3 can be used as the configuration information of the default sidelink radio bearer or the configuration information of the general sidelink radio bearer. When the UE 700 determines in operation 760 that the default SLRB configuration information is received, the UE 700 can configure the default sidelink radio bearer by using the information of Table 3 that has been acquired. When the UE 700 determines in operation 760 that the information of Table 3 is received from the base station 750, the UE 700 can configure the general sidelink radio bearer by using the acquired information of Table 3. However, the present disclosure is not limited to the above embodiments.

[0172] When it is determined in operation 760 that the SLRB configuration information of the requested V2X flow is not received, in operation 762 , the UE 700 may determine to use a default SLRB configuration of the V2X flow.

[0173] According to an embodiment of the present disclosure, when the UE 700 performs unicast-based sidelink data transmission / reception with another UE, the UE 700 may use the sidelink radio bearer determined in operation 706. In addition, when the UE 700 performs groupcast-based sidelink data transmission / reception with a specific group of UEs, the UE 700 may use the sidelink radio bearer determined in operation 706. In addition, when the UE 700 performs broadcast-based sidelink data transmission / reception, the UE 700 may use the sidelink radio bearer determined in operation 706. The configuration information of the default sidelink radio bearer may include Table 3.

[0174] Figure 8 The signal flow when the terminal determines the SLRB configuration according to an embodiment of the present disclosure is shown.

[0175] Reference Figure 8 In operation 802, the UE 800 may identify (or determine or discern) a need for SLRB configuration of the V2X flow. The need for SLRB configuration in operation 802 may correspond to at least one of the following cases: a case where a new packet is determined to have been generated in a V2X application, a case where a new V2X application is determined to have been generated, a case where a new V2X flow is determined to have occurred, or a case where a new V2X flow is determined to have occurred, an already acquired SLRB configuration may not be used, and a new SLRB configuration is required. However, the present disclosure is not limited to the above-mentioned embodiments.

[0176] When it is determined in operation 802 that the SLRB configuration of the V2X flow that has been acquired can be used, the UE 800 can use the sidelink radio bearer of the preconfigured V2X flow. In operation 804, when it is determined that a new SLRB configuration is required, the UE 800 can obtain the SLRB configuration information of the V2X flow sent by the base station 850. According to an embodiment of the present invention, the SLRB configuration information may include a SLRB configuration corresponding to the QoS information of the V2X flow. The QoS information may include at least one of a 5G QoS identifier (5QI), a ProSe QoS identifier (PQI), a ProSe flow identifier (PFI), an application identifier, a service identifier, a broadcast type, a destination identifier, or a frequency identifier. However, the present disclosure is not limited to the above embodiments.

[0177] In addition, according to an embodiment of the present disclosure, SLRB configuration information corresponding to QoS information of the V2X flow may be included in a system information block (SIB) message transmitted by the base station 850. However, the present disclosure is not limited to the above-mentioned embodiments.

[0178] According to an embodiment of the present disclosure, the message of operation 804 may not include SLRB configuration information for the V2X flow requested by the UE 800. In operation 806, the UE 800 may determine that the SLRB configuration information of the requested V2X flow has not been acquired. The case where the UE 800 determines that the SLRB configuration information of the requested V2X flow has not been acquired may correspond to at least one of a case where all the requested SLRB configuration information of the V2X flow is not received or a case where some SLRB configuration information of the V2X flow is not received. However, the present disclosure is not limited to the above-mentioned embodiments.

[0179] In operation 808, when it is determined that the SLRB configuration information is not received, the UE 800 may determine to use the default SLRB configuration for the V2X flow. The configuration information of the default sidelink radio bearer may include Table 3.

[0180] According to an embodiment of the present disclosure, in operation 804, the SLRB configuration information may indicate SLRB configuration information for using a default sidelink radio bearer as a V2X flow requested by the UE 800. The UE 800 may determine that the default sidelink radio bearer is configured as the SLRB configuration information for the V2X flow requested in operation 802, and may determine to use the default sidelink radio bearer for the V2X flow as in operation 808.

[0181] According to an embodiment of the present disclosure, when the UE 800 performs unicast-based data transmission / reception with another UE, the UE 800 may use the default sidelink radio bearer acquired in operation 808. When the UE 800 performs groupcast-based sidelink data transmission / reception with a specific group of UEs, the UE 800 may use the default sidelink radio bearer acquired in operation 808. When the UE 800 performs broadcast-based sidelink data transmission / reception, the UE 800 uses the default sidelink radio bearer acquired in operation 808.

[0182] According to an embodiment of the present disclosure, when it is determined that the UE 800 receives the SLRB configuration information of the V2X flow from the base station 850 while using the default sidelink radio bearer, the UE 800 may stop using the default sidelink radio bearer of the V2X flow, and may perform data transmission / reception by using the sidelink radio bearer received from the base station 850. When the UE 800 performs unicast-based sidelink data transmission / reception with another UE and the other UE must know the change of the sidelink radio bearer, a sidelink radio bearer change procedure between the UE 800 and the other UE may be performed. After the other UE sends a confirmation message for the sidelink radio bearer change procedure to the UE 800, the UE 800 and the other UE may perform unicast-based sidelink data transmission / reception by using the changed sidelink radio bearer.

[0183] Fig. 9 The signal flow when the terminal determines the SLRB configuration according to an embodiment of the present disclosure is shown.

[0184] Reference Fig. 9In operation 902, the UE 900 may identify (or determine or discern) a need for SLRB configuration of the V2X flow. The need for SLRB configuration in operation 902 may correspond to at least one of the following cases: a case where a new packet is determined to have been generated in a V2X application, a case where a new V2X application is determined to have been generated, a case where a new V2X flow is determined to have occurred, or a case where a new V2X flow is determined to have occurred, an already acquired SLRB configuration may not be used, and a new SLRB configuration is required. However, the present disclosure is not limited to the above-mentioned embodiments.

[0185] When it is determined in operation 902 that the SLRB configuration of the V2X flow that has been acquired can be used, the UE 900 can use the sidelink radio bearer of the preconfigured V2X flow. When it is determined that a new SLRB configuration is required, in operation 904, the UE 900 can obtain the SLRB configuration information of the V2X flow sent by the base station 950. According to an embodiment of the present invention, the SLRB configuration information may include a SLRB configuration corresponding to the QoS information of the V2X flow. The QoS information may include at least one of a 5G QoS identifier (5QI), a ProSe QoS identifier (PQI), a ProSe flow identifier (PFI), an application identifier, a service identifier, a broadcast type, a destination identifier, or a frequency identifier. However, the present disclosure is not limited to the above embodiments.

[0186] According to an embodiment of the present disclosure, SLRB configuration information corresponding to QoS information of the V2X flow may be included in a system information block (SIB) message transmitted by the base station 950. In addition, in operation 904, the SIB message transmitted by the base station 950 may not include SLRB configuration information corresponding to QoS information of the V2X flow.

[0187] In operation 906, the UE 900 may determine that the SLRB configuration information of the requested V2X flow has not been acquired. In operation 908, the UE 900 may perform a cell (re)selection procedure for (re)selecting the determined cell to acquire the requested SLRB configuration corresponding to the QoS information of the V2X flow.

[0188] According to an embodiment of the present disclosure, the UE 900 may acquire the sidelink radio bearer information of the requested V2X flow through the cell selected in the cell (re)selection process.

[0189] In addition, according to an embodiment of the present disclosure, the UE 900 may determine that the sidelink radio bearer information of the requested V2X flow may not be acquired through the cell selected in the cell (re)selection process. The UE 900 may determine to use a default sidelink radio bearer for the V2X flow until it is determined that a general sidelink radio bearer corresponding to the QoS information of the V2X flow can be acquired.

[0190] Fig.10 The signal flow when the terminal determines the SLRB configuration according to an embodiment of the present disclosure is shown.

[0191] Reference Fig.10 In operation 1002, the UE 1000 may identify (or determine or discern) a need for SLRB configuration of the V2X flow. The need for SLRB configuration in operation 1002 may correspond to at least one of the following cases: a case where a new packet is determined to have been generated in a V2X application, a case where a new V2X application is determined to have been generated, a case where a new V2X flow is determined to have occurred, or a case where a new V2X flow is determined to have occurred, an already acquired SLRB configuration may not be used, and a new SLRB configuration is required. However, the present disclosure is not limited to the above-mentioned embodiments.

[0192] When it is determined in operation 1002 that the SLRB configuration of the V2X flow that has been acquired can be used, the UE 1000 may use the sidelink radio bearer of the preconfigured V2X flow. When it is determined that a new SLRB configuration is required, in operation 1004, the UE 1000 may determine whether the SLRB configuration information of the requested V2X flow has been acquired from the preconfigured SLRB configuration information. According to an embodiment of the present invention, the SLRB configuration information may include an SLRB configuration corresponding to the QoS information of the V2X flow. The QoS information may include at least one of a 5G QoS identifier (5QI), a ProSe QoS identifier (PQI), a ProSe flow identifier (PFI), an application identifier, a service identifier, a broadcast type, a destination identifier, or a frequency identifier. However, the present disclosure is not limited to the above embodiments.

[0193] According to an embodiment of the present disclosure, the SLRB configuration information acquired in operation 1004 includes information about at least one sidelink radio bearer for transmitting / receiving a V2X packet of a V2X flow for requesting QoS information. When the UE 1000 performs unicast-based sidelink data transmission / reception with another UE, the UE 1000 may use the sidelink radio bearer acquired in operation 1004. When the UE 1000 performs multicast-based sidelink data transmission / reception with a specific group of UEs, the UE 1000 may use the sidelink radio bearer acquired in operation 1004. When the UE 1000 performs broadcast-based sidelink data transmission / reception, the UE 1000 may use the sidelink radio bearer acquired in operation 1004.

[0194] Fig.11 The signal flow when the terminal determines the SLRB configuration according to an embodiment of the present disclosure is shown.

[0195] Reference Fig.11 In operation 1102, the UE 1100 may identify (or determine or discern) a need for SLRB configuration of the V2X flow. The need for SLRB configuration in operation 1102 may correspond to at least one of the following situations: a situation where a new packet is determined to have been generated in a V2X application, a situation where a new V2X application is determined to have been generated, a situation where a new V2X flow is determined to have occurred, or a situation where a new V2X flow is determined to have occurred, an already acquired SLRB configuration may not be used, and a new SLRB configuration is required.

[0196] When it is determined in operation 1102 that the SLRB configuration of the V2X flow that has been acquired can be used, the UE 1100 may use the sidelink radio bearer of the preconfigured V2X flow. When it is determined that a new SLRB configuration is required, in operation 1104, the UE 1100 may determine whether the SLRB configuration information of the requested V2X flow is acquired from the preconfigured SLRB configuration information.

[0197] When the UE 1100 determines in operation 1104 that the SLRB configuration information of the V2X flow is not acquired from the pre-configured SLRB configuration information, the UE 1100 may determine in operation 1106 whether to use the default SLRB configuration of the V2X flow. The configuration information of the default sidelink radio bearer may include Table 3.

[0198] According to an embodiment of the present disclosure, the SLRB configuration information indicating the use of the default sidelink radio bearer as the V2X flow requested by the UE 1100 is indicated in operation 1104. The UE 1100 may determine to use the default sidelink radio bearer for the V2X flow.

[0199] According to an embodiment of the present disclosure, when the UE 1100 performs unicast-based sidelink data transmission / reception with another UE, the UE 1100 may use the default sidelink radio bearer acquired in operation 1106. When the UE 1100 performs groupcast-based sidelink data transmission / reception with a specific group of UEs, the UE 1100 may use the default sidelink radio bearer acquired in operation 1106. When the UE 1100 performs broadcast-based sidelink data transmission / reception, the UE 1100 may use the default sidelink radio bearer acquired in operation 1106.

[0200] In addition, according to an embodiment of the present disclosure, the terminal may determine whether a general SLRB configuration or a default SLRB configuration is obtained from the base station or the system. Obtaining the general SLRB configuration or the default SLRB configuration of the terminal may include a case where the SLRB configuration is pre-configured. The terminal may determine whether the general SLRB configuration obtained from the base station or the system satisfies the QoS information corresponding to the V2X flow requested by the terminal. The information that can be used by the terminal as a standard for determining whether the QoS information corresponding to the V2X flow is met may include, for example, at least one of 5QI, PQI, range requirements, or data rate requirements. However, the present disclosure is not limited to the above embodiments.

[0201] For example, when it is determined that at least one of a TX parameter, a resource allocation parameter, or a resource selection parameter that can meet the waiting time requirement of the V2X flow is included in the general SLRB configuration, the terminal can determine that the QoS information corresponding to the V2X flow is met.

[0202] According to an embodiment of the present disclosure, when it is determined that the general SLRB configuration acquired from the base station or the system does not satisfy the QoS information corresponding to the V2X flow, the terminal can determine whether to use the default sidelink radio bearer or the general sidelink radio bearer acquired for the V2X flow. The terminal can determine to use the radio bearer configuration that best satisfies the QoS information corresponding to the V2X flow by comparing the parameters of the default sidelink radio bearer configuration allocated by the base station or the system and the general SLRB configuration.

[0203] According to an embodiment of the present disclosure, the indication information used by the base station or system to configure the default sidelink radio bearer for the V2X flow requested by the terminal can be sent from the base station or system to the terminal by using at least one of the following methods. However, the present disclosure is not limited to the following embodiments.

[0204] - A default SLRB configuration indicator corresponding to the V2X flow included in the SLRB configuration message sent by the base station as a response to the SLRB configuration request message requested by the terminal to the base station

[0205] - A default SLRB configuration indicator corresponding to the V2X flow included in the SIB of the SLRB configuration message sent by the base station

[0206] - One or more V2X flows included in the SIB of the SLRB configuration message sent by the base station (in this case, because the SLRB configuration corresponding to the V2X flow is not specified, the terminal can implicitly determine that the default sidelink radio bearer is configured for the V2X flow)

[0207] -Default SLRB configuration indicator corresponding to the V2X flow included in the pre-configured SLRB configuration information

[0208] - One or more V2X flows included in the pre-configured SLRB configuration information (in this case, since no SLRB configuration corresponding to the V2X flow is specified, the terminal may determine to configure a default sidelink radio bearer for the V2X flow)

[0209] The above-mentioned various embodiments of the present disclosure describe the operation of the terminal using the default sidelink radio bearer of the V2X flow when it is determined that the SLRB configuration information of the V2X flow requested by the terminal is not obtained from the base station or the system. In addition, according to an embodiment of the present disclosure, when the packet transmission / reception of the V2X flow is performed by obtaining the SLRB configuration information of the V2X flow requested by the terminal from the base station or the system, the sidelink radio bearer may no longer be used. When the sidelink radio bearer is no longer used, the terminal may determine to perform packet transmission / reception by using the default sidelink radio bearer of the V2X flow.

[0210] According to an embodiment of the present disclosure, a terminal may obtain sidelink radio bearer information of a V2X flow used when performing a handover with a base station to be used in a target base station. A terminal may obtain sidelink radio bearer information of a V2X flow used when performing a state transition from RRC connection (RRC_CONNECTED) to RRC idle / RRC inactive (RRC_IDLE / RRC_INACTIVE) or from RRC idle / RRC inactive to RRC connection to be used in a changed state. When the terminal changes from within base station coverage (IN-COVERAGE) to outside base station coverage (OUT-COVERAGE) or from outside base station coverage to within base station coverage, the terminal may obtain sidelink radio bearer information of the V2X flow being used to be used in the changed state. According to an embodiment of the present disclosure, a terminal may determine to use a default sidelink radio bearer for a V2X flow requested in at least one of the following exceptional cases. However, the present disclosure is not limited to the following embodiments.

[0211] - When the terminal performs data transmission / reception by using the side link radio bearer configured by the serving base station of the V2X flow and then performs handover to the target base station, the terminal determines that the SLRB configuration information of the V2X flow is not acquired from the target base station

[0212] - When the terminal performs data transmission / reception by using the side link radio bearer configured by the serving base station of the V2X flow and then performs handover to the target base station, the terminal determines that the default SLRB configuration information of the V2X flow is received from the target base station

[0213] - The case where the terminal determines that the SLRB configuration to be used after a state transition (e.g., from RRC connected to RRC idle / RRC inactive, from RRC idle / RRC inactive to RRC connected, from outside base station coverage to within base station coverage, or from within base station coverage to outside base station coverage) that does not acquire the V2X flow

[0214] - Instructs the terminal to use the default SLRB configuration after a state transition of a V2X flow (e.g., from RRC connected to RRC idle / RRC inactive, from RRC idle / RRC inactive to RRC connected, from out of base station coverage to in base station coverage, or from in base station coverage to out of base station coverage)

[0215] - A case where the terminal performs a handover or state transition to the target station and then determines that the generic SLRB configuration acquired for the V2X flow does not satisfy the QoS requirements corresponding to the V2X flow

[0216] - When the terminal performs handover or state transition to the target base station and then the general SLRB configuration acquired for the V2X flow does not satisfy the QoS requirement corresponding to the V2X flow, the case where the terminal is allowed to arbitrarily use the SLRB configuration of the V2X flow

[0217] According to various embodiments of the present disclosure, when it is determined that the terminal must change the SLRB configuration for the V2X flow with another corresponding terminal, the SLRB configuration change process for the V2X flow between the terminal and the other corresponding terminal may be performed.

[0218] In addition, according to an embodiment of the present disclosure, a case where a bidirectional SLRB configuration is required between two terminals performing unicast-based V2X packet transmission / reception can be considered. When configuring a bidirectional sidelink radio bearer, a sidelink radio bearer can be configured for each terminal used as a transmitting terminal, or one sidelink radio bearer can be configured for two terminals. When configuring a sidelink radio bearer for each of the two terminals, each terminal can configure a sidelink radio bearer according to Figures 3 to 11When one sidelink radio bearer is configured for two terminals, each terminal may perform the following operations except Figures 3 to 11 A process (eg, a coordination process or a negotiation process) for determining a sidelink radio bearer between two terminals other than any of the processes in the above.

[0219] According to an embodiment of the present disclosure, a process of determining one sidelink radio bearer may correspond to one of the following. However, the present disclosure is not limited to the following embodiments.

[0220] - When the terminal acquires a default sidelink radio bearer and another terminal acquires a universal sidelink radio bearer, determining to use the universal sidelink radio bearer

[0221] - When a terminal acquires a default sidelink radio bearer and another terminal acquires a general sidelink radio bearer, determining to use a sidelink radio bearer that can best meet the QoS requirements of the V2X flow

[0222] -When two terminals respectively acquire common sidelink radio bearers and determine that the configurations of the two common sidelink radio bearers are different from each other, determine to use a sidelink radio bearer that best meets the QoS requirements of the V2X flow

[0223] -When two terminals respectively acquire common sidelink radio bearers and determine that the configurations of the two common sidelink radio bearers are the same, determine to use the corresponding sidelink radio bearer for the V2X flow

[0224] - When both terminals acquire a default sidelink radio bearer, determine to use the default sidelink radio bearer for the V2X flow

[0225] - Determine the use of a sidelink radio bearer acquired by a terminal designated to determine the sidelink radio bearer for the V2X flow from both terminals

[0226] In addition, according to an embodiment of the present disclosure, when the terminal determines the priority information of the V2X flow or the sidelink radio bearer and can perform uplink and sidelink packet transmission / reception at the same time, the terminal can determine whether to send the uplink packet or the sidelink packet first. The terminal can obtain the priority information of the V2X flow or the sidelink radio bearer through the base station or the system. The terminal can obtain the default priority information application indication for the V2X flow or the sidelink radio bearer through the base station or the system. In addition, the terminal can obtain the priority information of the uplink flow through the base station or the system. In addition, the terminal can obtain the default priority information application indication for the uplink flow through the base station or the system. The terminal can determine the transmission priority between the V2X flow or the sidelink radio bearer and the uplink flow based on the priority information of the V2X flow or the sidelink radio bearer or the priority information of the uplink flow obtained from the base station or the system.

[0227] According to an embodiment of the present disclosure, the default priority information may be indicated as using a default sidelink radio bearer. According to various embodiments of the present disclosure, the default priority information may be indicated as using a general sidelink radio bearer. According to an embodiment of the present disclosure, when priority information including a default priority is not indicated for a default sidelink radio bearer or a general sidelink radio bearer, the terminal may determine to use a default priority level corresponding to the QoS information of the V2X flow.

[0228] Fig. 12A 12B shows a signal flow of a terminal that acquires priority information of a V2X flow or a sidelink radio bearer according to an embodiment of the present disclosure. 12C shows a signal flow of a terminal that acquires priority information of a V2X flow or a sidelink radio bearer according to an embodiment of the present disclosure.

[0229] Reference Fig. 12A In operation 1202, the UE 1200 may request the SLRB configuration of the V2X flow by sending a SLRB configuration request message to the base station 1250. In operation 1204, the base station 1250 may send the SLRB configuration information of the V2X flow to the UE 1200 in response to the request in operation 1202. In operation 1206, the UE 1200 may determine the SLRB configuration and priority information of the V2X flow.

[0230] Reference Fig. 12B In operation 1222, the UE 1200 may receive a SLRB configuration message transmitted by the base station 1250. In operation 1224, the UE 1200 may determine the SLRB configuration and priority information of the V2X flow based on the information acquired in operation 1222.

[0231] Reference Fig. 12C In operation 1242, the UE 1200 may determine whether to obtain pre-configured SLRB configuration information. In operation 1244, the UE 1200 may determine the SLRB configuration and priority information of the V2X flow based on the information obtained in operation 1242.

[0232] Fig.13A shows a signal flow of a terminal for acquiring priority information of a V2X flow or a sidelink radio bearer according to an embodiment of the present disclosure, and Fig. 13B A signal flow of a terminal for acquiring priority information of a V2X flow or a sidelink radio bearer according to an embodiment of the present disclosure is shown.

[0233] Reference Fig.13A UE 1300 can be based on Fig. 12A , Fig. 12B and 12C The UE 1300 may perform a process of acquiring priority information of a V2X flow or a sidelink radio bearer according to each of the processes in operation 1302. In operation 1304, the UE 1300 may determine to use a default priority of the V2X flow or the sidelink radio bearer.

[0234] Reference Fig. 13B UE 1300 can be based on Fig. 12A , Fig. 12B and 12C The UE 1300 may perform a process of acquiring priority information of a V2X flow or a sidelink radio bearer according to each of the processes in operation 1352. In operation 1354, the UE 1300 may determine to use the default priority information of the V2X flow or the sidelink radio bearer.

[0235] Fig.14 is a diagram illustrating an operation of a terminal for determining a transmission priority according to an embodiment of the present invention.

[0236] refer to Fig.14, when the terminal can perform uplink transmission and sidelink transmission at different times, the terminal can determine the transmission priority between the uplink and the sidelink based on a priority threshold. For example, the terminal can determine the priority of the sidelink based on the priority threshold. The priority threshold can be configured by the terminal by using at least one of RRC dedicated signaling, V2X SIB signaling, or pre-configuration. When it is determined that the priority of the sidelink is higher than the priority threshold, the terminal can determine to send the sidelink before the uplink. When it is determined that the priority of the sidelink is lower than the priority threshold, the terminal can determine to send the sidelink later than the uplink. Figures 12A to 13B The priority of the side link is obtained by at least one of the processes.

[0237] According to an embodiment of the present disclosure, a side link stream may refer to a data stream generated when a side link terminal sends data to another side link terminal or receives data from another side link terminal, and an uplink stream may refer to a data stream generated when a terminal sends data to a base station. In addition, a side link transmission may refer to a transmission from a side link terminal to another side link terminal, and an uplink transmission may refer to a transmission from a terminal to a base station. However, the present disclosure is not limited to the above embodiments.

[0238] In operation 1400, the terminal may determine that the sidelink transmission and the uplink transmission may not be performed simultaneously. In operation 1402, the terminal may determine the priority of the sidelink. Figures 12A to 13B The determination in operation 1402 is performed by at least one of the processes of . However, the present disclosure is not limited to the above-mentioned embodiments.

[0239] In operation 1404, the terminal may determine priority threshold information. In operation 1406, the terminal may determine whether the priority of the side link determined in operation 1402 is higher than the priority threshold.

[0240] When it is determined in operation 1406 that the priority of the side link is higher than the priority threshold, the terminal may determine to send the side link first in operation 1408. When it is determined in operation 1406 that the priority of the side link is not higher than the priority threshold, the terminal may determine to send the uplink first in operation 1410.

[0241] Furthermore, according to the embodiments of the present disclosure, even in Fig.14 In the embodiment, the terminal can determine by making an exception to send MSG1, MSG3 and emergency services of the uplink before the sidelink packet. That is, even when the sidelink is sent first, a certain uplink packet can be sent before the sidelink packet. In other words, the terminal can determine the priority of each of the uplink packet and the sidelink packet, or can determine the priority according to the packet type. The terminal can send the packet according to the determined priority.

[0242] Fig.15 is a diagram illustrating an operation of a terminal for determining a transmission priority according to an embodiment of the present disclosure.

[0243] refer to Fig.15 , when the terminal may not perform uplink transmission and sidelink transmission at the same time, the terminal may determine the transmission priority by comparing the priority of the uplink flow with the priority of the sidelink flow. The priority of the uplink flow and the priority of the sidelink flow may be configured by the base station or the system and may be determined according to Figures 12A to 13B to obtain at least one of the processes.

[0244] According to an embodiment of the present disclosure, the priority of an uplink flow or a radio bearer and the priority of a sidelink flow or a radio bearer may be configured as comparable values ​​based on at least one of, for example, a QFI, a 5QI, or a default priority level. When it is determined that the priority of the sidelink flow or the radio bearer is higher than the priority of the uplink flow or the radio bearer, the terminal may determine to send the sidelink before the uplink. When it is determined that the priority of the sidelink flow or the radio bearer is lower than the priority of the uplink flow or the radio bearer, the terminal may determine to send the sidelink later than the uplink.

[0245] In operation 1500, the terminal may determine that the sidelink transmission and the uplink transmission may not be performed simultaneously. In operation 1502, the terminal may determine the priority of the sidelink and the priority of the uplink. Figures 12A to 13B The determination in operation 1502 is performed by at least one of the processes of . However, the present disclosure is not limited to the above-mentioned embodiments.

[0246] In operation 1504, the terminal may compare the priority of the side link with the priority of the uplink. In operation 1506, the terminal may determine whether the priority of the side link is higher than the priority of the uplink.

[0247] When it is determined in operation 1506 that the priority of the side link is higher than the priority of the uplink, the terminal may determine to first transmit the side link in operation 1508. When it is determined in operation 1506 that the priority of the side link is not higher than the priority of the uplink, the terminal may determine to first transmit the uplink in operation 1510.

[0248] Furthermore, according to the embodiments of the present disclosure, even in Fig.15In the embodiment, the terminal can determine by making an exception to send MSG1, MSG3 and emergency services of the uplink before the sidelink packet. That is, even when the sidelink is sent first, a certain uplink packet can be sent before the sidelink packet. In other words, the terminal can determine the priority of each of the uplink packet and the sidelink packet, or can determine the priority according to the packet type. The terminal can send the packet according to the determined priority.

[0249] In addition, according to an embodiment of the present disclosure, when the terminal operates an LTE-based sidelink and an NR-based uplink and determines that the sidelink transmission and the uplink transmission may not be performed simultaneously, the terminal may determine the transmission priority by comparing the priority of the sidelink packet with the priority threshold. The priority threshold may be configured by the terminal using at least one of RRC dedicated signaling, V2X SIB signaling, or pre-configuration. For example, when the priority of the sidelink packet is higher than the priority threshold, the terminal may determine to send the sidelink before the uplink. When the priority of the sidelink packet is lower than the priority threshold, the terminal may determine to send the sidelink later than the uplink.

[0250] According to an embodiment of the present disclosure, when the terminal operates an LTE-based sidelink and an NR-based uplink and determines that the sidelink transmission and the uplink transmission can be performed at different times, the terminal can determine the transmission priority by comparing the priority of the sidelink packet with the priority of the uplink 5QI (stream or bearer). For example, when the priority of the sidelink packet is higher than the priority of the uplink 5QI (stream or bearer), the terminal can send to send the sidelink before the uplink. When the priority of the sidelink packet is lower than the priority of the uplink 5QI (stream or bearer), the terminal can determine to send the sidelink later than the uplink. In addition, as described above, the terminal can determine to send MSG1, MSG3 and emergency services of the uplink before the sidelink packet by making an exception.

[0251] According to an embodiment of the present disclosure, when the terminal operates an NR-based sidelink and an LTE-based uplink and determines that the sidelink transmission and the uplink transmission can be performed at different times, the terminal can determine the transmission priority by comparing the sidelink with a priority threshold. The priority threshold can be configured by the terminal by using at least one of RRC dedicated signaling, V2X SIB signaling, or pre-configuration. For example, when the priority of the sidelink is higher than the priority threshold, the terminal can determine to send the sidelink before the uplink. When the priority of the sidelink is lower than the priority threshold, the terminal can determine to send the sidelink later than the uplink. As another example, the terminal can determine the transmission priority by comparing the priority of the uplink with the priority of the sidelink. The priority of the uplink can be determined as the priority of the QoS class identifier (QCI) corresponding to the uplink is applied. According to Figures 12A to 13B In at least one embodiment of the present invention, the priority of the sidelink may be applied to the sidelink flow or radio bearer. When it is determined that the priority of the sidelink is higher than the priority of the uplink, the terminal may determine to send the sidelink before the uplink. When it is determined that the priority of the sidelink is lower than the priority of the uplink, the terminal may determine to send the sidelink later than the uplink. In addition, as described above, the terminal may determine to send MSG1, MSG3 and emergency services of the uplink before the sidelink packet by making an exception.

[0252] In addition, according to an embodiment of the present disclosure, when the terminal operates the LTE side link, the NR side link, and the NR uplink, the terminal may temporarily determine the priority of the LTE side link and the priority of the NR side link. For example, the terminal may determine that the priority corresponding to the packet is applied to the LTE side link, and the priority corresponding to the stream or radio bearer is applied to the NR side link. The terminal may determine the transmission priority by comparing the priority of the LTE side link with the priority of the NR side link. The terminal may determine the transmission priority by applying a priority threshold to the priority of the LTE side link. The priority threshold may be configured by the terminal by using at least one of RRC dedicated signaling, V2X SIB signaling, or pre-configuration. When it is determined that the priority of the LTE side link is higher than the priority threshold, the terminal may determine to send the LTE side link before the NR side link. When it is determined that the priority of the LTE side link is lower than the priority threshold, the terminal may send to the LTE side link later than the NR side link. In addition, the terminal may determine the transmission priority by applying the priority threshold to the priority of the NR side link. When it is determined that the priority of the NR side link is higher than the priority threshold, the terminal may determine to send the NR side link before the LTE side link. When it is determined that the priority of the NR side link is lower than the priority threshold, the terminal may determine to send the NR side link later than the LTE side link.

[0253] According to an embodiment of the present disclosure, the terminal may determine the transmission priority by comparing the priority of the LTE side link packet with the priority of the NR side link. The priority of the NR side link may correspond to at least one of the priority of the side link radio bearer or the priority of the side link stream. When the priority of the LTE side link is higher than the priority of the NR side link, the terminal may determine to give priority to sending the LTE side link. When the priority of the LTE side link is lower than the priority of the NR side link, the terminal may determine to send the LTE side link later. In addition, as described above, the terminal may send MSG1, MSG3 and emergency services of the uplink by making an exception before the side link packet.

[0254] Figures 12A to 15 At least one embodiment of the present invention can even be applied to the case where a terminal configures a connection with two or more base stations by using dual connection. For example, the main cell group (MCG) in the dual connection of the terminal can be an LTE base station or an NR base station. The secondary cell group (SCG) can be an LTE base station or an NR base station. The terminal can perform sidelink transmission with another terminal while performing uplink transmission with two or more base stations by using dual connection.

[0255] For example, a scenario in which a terminal performs data transmission / reception through dual connection and side link may include a case in which the terminal performs packet transmission through an LTE side link, an LTE uplink, and an NR uplink. However, the present disclosure is not limited to the above examples, and the scenario may include a case in which the terminal performs packet transmission through an LTE side link, an NR uplink, and an NR uplink, a case in which the terminal performs packet transmission through an NR side link, an LTE uplink, and an NR uplink, and a case in which the terminal performs packet transmission through an NR side link, an NR uplink, and an NR uplink.

[0256] According to an embodiment of the present disclosure, when the terminal may not perform uplink transmission and sidelink transmission at the same time, the terminal may Figures 12A to 15 The terminal may determine the priority between the uplink transmission and the sidelink transmission as in at least one embodiment of the present invention. That is, the terminal may determine the priority between the sidelink and the uplink by comparing the priority of the sidelink packet and the priority threshold, or may determine the priority between the sidelink and the uplink by comparing the priority of the stream, packet or radio bearer. The terminal may determine to send the uplink MSG1, MSG3 and emergency service before the sidelink packet by making an exception.

[0257] In addition, according to an embodiment of the present disclosure, the terminal can make an exception to preferentially send an uplink whose transmission timing is determined or whose transmission resources have been determined (e.g., HARQ feedback or channel state feedback), or an uplink that must be received by the receiver within a certain time, such as packet duplication. The terminal can make an exception to preferentially send sidelink HARQ feedback information whose transmission timing is determined or whose transmission resources have been determined.

[0258] Fig.16 is a block diagram illustrating the internal structure of the transmitting terminal 1600 according to an embodiment of the present invention.

[0259] Reference Fig.16 , the transmitting terminal 1600 of the present disclosure may include a transceiver 1610, a processor (controller) 1620, and a memory (storage) 1630. However, the elements of the transmitting terminal 1600 are not limited thereto. For example, the transmitting terminal 1600 may include more or less elements than the above elements. In addition, the transceiver 1610, the processor 1620, and the memory 1630 may be implemented as one chip.

[0260] According to an embodiment of the present disclosure, the transceiver 1610 can send / receive signals to / from a base station or another terminal. The signals sent / received to / from a base station or other terminals may include synchronization signals, reference signals, control information, and data. The transceiver 1610 may include a radio frequency (RF) transmitter that up-converts and amplifies the frequency of the transmitted signal and an RF receiver that performs low noise amplification and down-conversion on the received signal. However, this is just an example, and the elements of the transceiver 1610 are not limited to RF transmitters and RF receivers. In addition, the transceiver 1610 can receive a signal through a wireless channel, can output the signal to the processor 1620, and can send a signal output from the processor 1620 through a wireless channel.

[0261] According to an embodiment of the present disclosure, the processor 1620 may control a series of processes of the transmitting terminal 1600 according to an embodiment of the present disclosure. For example, the processor 1620 may send QoS information of the V2X flow to the base station, may obtain the sidelink bearer configuration of the V2X flow, and may perform sidelink data transmission / reception based on the obtained sidelink bearer configuration.

[0262] According to an embodiment of the present disclosure, the memory 1630 may store programs and data necessary for operating the transmitting terminal 1600. In addition, the memory 1630 may store control information or data included in a signal sent / received by the transmitting terminal 1600. The memory 1630 may include a storage medium, such as a read-only memory (ROM), a random access memory (RAM), a hard disk, a compact disk ROM (CD-ROM), a digital versatile disk (DVD), or a combination of storage media. In addition, a plurality of memories 1630 may be provided. In addition, according to an embodiment of the present disclosure, the memory 1630 may store a program for executing a method for configuring and operating a side link data bearer.

[0263] Fig.17 is a block diagram illustrating an internal structure of a receiving terminal according to an embodiment of the present invention.

[0264] Reference Fig.17 , the receiving terminal 1700 of the present disclosure may include a transceiver 1710, a processor (controller) 1720, and a memory (storage) 1730. However, the elements of the receiving terminal 1700 are not limited thereto. For example, the receiving terminal 1700 may include more or less elements than the above elements. In addition, the transceiver 1710, the processor 1720, and the memory 1730 may be implemented as one chip.

[0265] According to an embodiment of the present disclosure, the transceiver 1710 can send / receive signals to / from a base station or another terminal. The signals sent / received to / from a base station or other terminals may include synchronization signals, reference signals, control information, and data. The transceiver 1710 may include an RF transmitter that up-converts and amplifies the frequency of the transmitted signal and an RF receiver that performs low noise amplification and down-conversion on the received signal. However, this is just an example, and the elements of the transceiver 1710 are not limited to the RF transmitter and the RF receiver. In addition, the transceiver 1710 can receive a signal through a wireless channel, can output the signal to the processor 1720, and can send a signal output from the processor 1720 through a wireless channel.

[0266] According to an embodiment of the present disclosure, the processor 1720 may control a series of processes of the receiving terminal 1700 according to an embodiment of the present disclosure. For example, the processor 1720 may exchange sidelink bearer configuration information of the V2X flow with the transmitting terminal 1600. However, the present disclosure is not limited thereto, and the terminal may perform sidelink data transmission / reception with the transmitting terminal 1600 based on the sidelink bearer configuration information received from the base station.

[0267] According to an embodiment of the present disclosure, the memory 1730 may store programs and data necessary for operating the receiving terminal 1700. In addition, the memory 1730 may store control information or data included in a signal sent / received by the receiving terminal 1700. The memory 1730 may include a storage medium, such as a ROM, a RAM, a hard disk, a CD-ROM, a DVD, or a combination of storage media. In addition, a plurality of memories 1730 may be provided. In addition, according to an embodiment of the present disclosure, the memory 1730 may store a program for executing a method for configuring and operating a sidelink data bearer.

[0268] Fig.18 is a block diagram illustrating the internal structure of a base station according to an embodiment of the present invention.

[0269] Reference Fig.18 , the base station 1800 of the present disclosure may include a transceiver 1810, a processor (controller) 1820, and a memory (storage space) 1830. However, the elements of the base station 1800 are not limited thereto. For example, the base station 1800 may include more or fewer elements than the above elements. In addition, the transceiver 1810, the processor 1820, and the memory 1830 may be implemented as one chip.

[0270] According to an embodiment of the present disclosure, the transceiver 1810 may send a signal to a terminal or receive a signal from a terminal. The signal sent to or received from the terminal may include a synchronization signal, a reference signal, control information, and data. The transceiver 1810 may include an RF transmitter that up-converts and amplifies the frequency of the transmitted signal and an RF receiver that performs low noise amplification and down-conversion on the received signal. However, this is just an example, and the elements of the transceiver 1810 are not limited to RF transmitters and RF receivers. Moreover, the transceiver 1810 may receive a signal through a wireless channel, output the signal to the processor 1820, and send a signal output from the processor 1820 through a wireless channel.

[0271] According to an embodiment of the present disclosure, the processor 1820 may control a series of processes of the base station 1800 according to an embodiment of the present disclosure. For example, the processor 1820 may send sidelink bearer configuration information to the receiving terminal 1700 or the base station 1800 based on the QoS information of the V2X flow, and may configure priority information for the V2X flow in the sidelink bearer configuration.

[0272] According to an embodiment of the present disclosure, the memory 1830 may store programs and data necessary for operating the base station 1800. In addition, the memory 1830 may store control information or data included in a signal sent / received by the base station 1800. The memory 1830 may include a storage medium, such as a ROM, a RAM, a hard disk, a CD-ROM, a DVD, or a combination of storage media. In addition, a plurality of memories 1830 may be provided. In addition, according to an embodiment of the present disclosure, the memory 1830 may store a program for executing a method for configuring and operating a sidelink data bearer.

[0273] The methods according to the claims or embodiments described herein may be implemented in the form of hardware, software or a combination of hardware and software.

[0274] When the method is implemented by software, a computer-readable storage medium for storing one or more programs (software modules) may be provided. One or more programs stored in the computer-readable storage medium are configured to be executed by one or more processors in an electronic device. One or more programs include instructions for allowing an electronic device to perform a method according to the claims or embodiments described herein.

[0275] These programs (software modules or software) can be stored in RAM, and non-volatile memory including flash memory, ROM, electrically erasable programmable read-only memory (EEPROM), magnetic disk storage device, CD-ROM, DVD, another optical storage device or magnetic tape cassette. Alternatively, the program can be stored in a memory configured by combining some or all of the above memories. In addition, each component memory can include multiple memories.

[0276] In addition, the program can be stored in an attachable storage device accessible through a communication network, such as the Internet, an intranet, a local area network (LAN), a wide area network (WLAN), a storage area network (SAN), or a combination thereof. Such a storage device can be connected to a device according to an embodiment of the present disclosure through an external port. In addition, a separate storage device on a communication network can be connected to a device according to an embodiment of the present disclosure.

[0277] According to an embodiment of the present disclosure, in a V2X system, a base station can effectively allocate sidelink transmission resources, and a terminal can reliably transmit data by effectively performing data transmission in unicast and multicast communications using a sidelink.

[0278] In the specific embodiments of the above disclosure, the components included in the disclosure are expressed as singular or plural, depending on the specific embodiments of the disclosure being described. However, for ease of explanation, singular or plural expression is appropriately selected, the disclosure is not limited to singular or plural component elements, and even if expressed as a singular element, it may also be composed of plural elements, and vice versa.

[0279] While the present disclosure has been shown and described with reference to various embodiments thereof, it will be understood by those skilled in the art that various changes in form and details may be made without departing from the spirit and scope of the invention as defined by the appended claims and their equivalents.

Claims

1. A communication method of a first side link terminal in a wireless communication system, the communication method comprising: receiving sidelink radio bearer configuration information and priority information for sidelink data transmission from a base station, wherein the sidelink radio bearer configuration information includes default sidelink radio bearer information indicating a default sidelink radio bearer for a sidelink QoS flow; identifying sidelink data to be sent to a second sidelink terminal; identifying uplink data to be sent to the base station; as well as In a case where the priority of the sidelink data determined based on the priority information for sidelink data transmission is higher than the priority threshold for the sidelink, transmitting the sidelink data to the second sidelink terminal before the uplink data based on the sidelink radio bearer configuration information and the priority information for uplink data transmission; Among them, the priority information for uplink data transmission and the priority threshold for the side link are configured via the radio resource control RRC signal.

2. The communication method according to claim 1, wherein the sidelink radio bearer configuration information is received from one of a response message to a configuration request message of the first sidelink terminal, system information received from the base station, or pre-configured configuration information.

3. The communication method according to claim 1, wherein: Receiving the sidelink radio bearer configuration information includes: If the first side link terminal is in RRC connected mode, then: requesting, by the first sidelink terminal, the sidelink radio bearer configuration information from the base station, and The sidelink radio bearer configuration information is received through a response message in response to the request.

4. The communication method according to claim 1, wherein receiving the sidelink radio bearer configuration information comprises: If the first sidelink terminal is in the RRC idle mode or the RRC inactive mode, the sidelink radio bearer configuration information is received through system information received from the base station.

5. The communication method according to claim 1, wherein receiving the sidelink radio bearer configuration information comprises: If the first sidelink terminal is in an out-of-coverage state, the sidelink radio bearer configuration information is received from preconfigured information.

6. The communication method according to claim 1, further comprising: acquiring new sidelink radio bearer configuration information during a state transition or a coverage change of the first sidelink terminal; as well as The acquired new sidelink radio bearer configuration information is applied.

7. The communication method according to claim 1, The sending of the sidelink data is further based on the first sidelink terminal determining that the uplink data and the sidelink data cannot be sent simultaneously.

8. The communication method according to claim 1, in, The priority of the sidelink data is configured for each logical channel of a radio bearer configured for the sidelink flow, and wherein the uplink data includes uplink data transmitted to the base station connected to the first sidelink terminal by using dual connectivity.

9. A first side link terminal of a wireless communication system, the first side link terminal comprising: Transceiver; as well as a processor coupled to the transceiver and configured to: receiving sidelink radio bearer configuration information and priority information for sidelink data transmission from a base station, wherein the sidelink radio bearer configuration information includes default sidelink radio bearer information indicating a default sidelink radio bearer for a sidelink QoS flow, identifying side link data to be sent to a second side link terminal, identifying uplink data to be sent to a base station, and In a case where the priority of the sidelink data determined based on the priority information for sidelink data transmission is higher than the priority threshold for the sidelink, transmitting the sidelink data to the second sidelink terminal before the uplink data based on the sidelink radio bearer configuration information and the priority information for uplink data transmission; Among them, the priority information for uplink data transmission and the priority threshold for the side link are configured via the radio resource control RRC signal.

10. The first side link terminal according to claim 9, wherein the side link radio bearer configuration information is received from one of a response message to a configuration request message of the first side link terminal, system information received from the base station, or pre-configured configuration information.

11. The first sidelink terminal of claim 9, wherein the processor is further configured to: when the first sidelink terminal is in RRC connected mode: requesting, by the first sidelink terminal, the sidelink radio bearer configuration information from the base station, and The sidelink radio bearer configuration information is received through a response message in response to the request.

12. The first sidelink terminal according to claim 9, wherein the processor is further configured to: receive the sidelink radio bearer configuration information through system information received from the base station when the first sidelink terminal is in RRC idle mode or RRC inactive mode.

13. The first sidelink terminal according to claim 9, wherein the processor is further configured to: receive the sidelink radio bearer configuration information from preconfigured information when the first sidelink terminal is in an out-of-coverage state.

14. The first sidelink terminal of claim 9, wherein the processor is further configured to: acquiring new sidelink radio bearer configuration information during a state transition or a coverage change of the first sidelink terminal; and The acquired new sidelink radio bearer configuration information is applied.

15. The first sidelink terminal of claim 9, wherein the processor is further configured to: determine that the uplink data and the sidelink data cannot be sent simultaneously, and in, Transmitting the sidelink data is also based on determining that the uplink data and the sidelink data cannot be transmitted simultaneously.

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