Method and apparatus for transmitting and receiving signal in wireless vehicle communication system

Abstract

A method and apparatus for transmitting or receiving a signal in a wireless vehicle communication system. The method is performed by a UE and includes acquiring vehicle communication configuration information, determining, for a vehicle communication, at least one of whether data, allocated resources or waveforms are to be relayed based on the acquired vehicle communication configuration information, and transmitting a signal to or receiving a signal from at least one other UE based on a result of the determination.

Description

[0001] This application is a divisional application of a PCT invention patent application with an application date of June 3, 2019, application number 201980006445.1, and invention name “Method and device for sending and receiving signals in a wireless vehicle communication system”. Technical Field

[0002] The present disclosure relates generally to wireless vehicle communication systems, and more particularly, to methods and apparatus for sending and receiving signals in a wireless vehicle communication system. Background Art

[0003] In order to meet the increased demand for wireless data traffic since the commercialization of the fourth generation (4G) communication system, efforts have been made to develop advanced fifth generation (5G) or new radio (NR) communication systems. In order to achieve high data rates, the 5G communication system is designed to support ultra-high frequency or millimeter wave (mmWave) bands (e.g., 28 GHz band).

[0004] In order to reduce path loss and increase the transmission distance of data in the ultra-high frequency band of the 5G communication system, various technologies such as beamforming, massive multiple-input multiple-output (massive MIMO), full-size MIMO (FD-MIMO), array antennas, analog beamforming and massive antennas are being studied. Unlike the long-term evolution (LTE) communication system, the 5G communication system supports various subcarrier spacings such as 15kHz, 30kHz, 60kHz and 120kHz, and uses polarity coding for the physical control channel and low-density parity check (LDPC) coding for the physical data channel. As waveforms for uplink (UL) transmission, discrete Fourier transform-spread-orthogonal frequency division multiplexing (DFT-s-OFDM) and cyclic prefix-OFDM (CP-OFDM) are used. The LTE communication system can support hybrid automatic repeat request (HARQ) retransmission in units of transport blocks (TBs), while the 5G communication system can additionally support HARQ retransmission based on a code block group (CBG) including multiple code blocks (CBs).

[0005] In order to improve the system network for 5G communication systems, various technologies have been developed, such as evolved small cells, advanced small cells, cloud radio access networks (RAN), ultra-dense networks, device-to-device (D2D) communication, wireless backhaul, vehicle-to-everything (V2X) networks, cooperative communication, coordinated multi-point (CoMP), and interference cancellation.

[0006] The Internet has evolved into the Internet of Things (IoT), in which distributed elements such as objects exchange and process information. Internet of Everything (IoE) technology has emerged, in which IoT technology is combined with technology for processing big data, such as by connecting to a cloud server. Various technical elements are required to implement IoT, such as sensing technology, wired / wireless communication and network infrastructure, service interface technology, and security technology, and technologies related to sensor networks, machine-to-machine (M2M) communication, and machine type communication (MTC) for connecting objects have recently been studied. In the IoT environment, smart Internet technology (IT) services can be provided to collect and analyze data obtained from connected objects to create new value in human life. With the integration and combination of existing information technology and various industries, IoT can be applied to various fields, such as smart homes, smart buildings, smart cities, smart cars or connected cars, smart grids, health care, smart appliances, and advanced medical services.

[0007] Various attempts are being made to apply 5G communication systems to IoT networks. For example, technologies related to sensor networks, M2M communications, and MTC are being implemented using 5G communication technologies, including beamforming, MIMO, and array antennas. Cloud RAN as an application of the above-mentioned big data processing technology is an example of the fusion of 5G communication technology and IoT technology. A variety of services can be provided to users in the above-mentioned communication system, and a method capable of providing different services in the same time period based on the characteristics of the services and a device using the method are needed to provide multiple services to users. Various services provided by 5G communication systems are under study. One example is a service that can meet low latency and high reliability requirements. Such a service may be referred to as "ultra-reliable and low-latency communication (URLLC)".

[0008] As another example, V2X is a general term for all types of communications applicable to vehicles, and refers to specific communication technologies used to implement “connected vehicles” or “networked vehicles.” V2X networking is generally divided into three types, namely, vehicle-to-infrastructure (V2I) communication, vehicle-to-vehicle (V2V) communication, and vehicle-to-pedestrian (V2P) communication.

[0009] As the wireless communication system develops as described above, various services can be provided, and thus a method capable of appropriately providing such services is required. Summary of the invention

[0010] Technical issues

[0011] As the wireless communication system develops as described above, various services can be provided, and thus a method capable of appropriately providing such services is required.

[0012] Solution

[0013] A method and apparatus for sending and receiving signals in a wireless vehicle communication system. The method performed by a UE includes: acquiring vehicle communication configuration information; determining whether to relay at least one of data, allocated resources, or waveforms for vehicle communication based on the acquired vehicle communication configuration information; and sending a signal to at least one other UE or receiving a signal from at least one other UE based on the determination result.

[0014] Advantageous Effects of the Invention

[0015] Accordingly, an aspect of the present disclosure is to provide a method for transmitting and receiving signals in a wireless vehicle communication system by determining a vehicle communication method by using vehicle communication configuration information. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] The above and other aspects, features and advantages of certain embodiments of the present disclosure will become more apparent from the following description taken in conjunction with the accompanying drawings, in which:

[0017] Figure 1 showing a vehicle communication environment;

[0018] Figure 2 shows a transmission resource structure for vehicle communications;

[0019] Figure 3 A data communication method between UEs according to an embodiment is shown;

[0020] Figure 4 A collaborative communication method between UEs according to an embodiment is shown;

[0021] Figure 5 is a flow chart showing an adaptive data communication method of a UE according to an embodiment;

[0022] Figure 6 A resource allocation method for coexistence of LTE-V2X and NR-V2X according to an embodiment is shown;

[0023] Figure 7 is a flowchart illustrating UE operation in a resource allocation method for coexistence of LTE-V2X and NR-V2X according to an embodiment;

[0024] Figure 8 is a flowchart illustrating UE operation in a resource allocation method for coexistence of LTE-V2X and NR-V2X according to an embodiment;

[0025] Fig. 9 A method of indicating a waveform used in a transmission resource region and a reception resource region of a UE according to an embodiment is shown;

[0026] Fig.10 is a flow chart illustrating a waveform selection method for data communication of a UE in a transmitting aspect according to an embodiment;

[0027] Fig.11 is a flow chart illustrating a waveform selection method for data communication of a UE on the receiving side according to an embodiment;

[0028] Fig.12 is a flowchart illustrating a signal transmission and reception method of a UE in a wireless vehicle communication system according to an embodiment;

[0029] Fig.13 shows a UE according to an embodiment; and

[0030] Fig.14 A base station according to an embodiment is shown. DETAILED DESCRIPTION

[0031] The present disclosure is designed to address at least the above-mentioned problems and / or disadvantages and to provide at least the advantages described below.

[0032] Accordingly, an aspect of the present disclosure is to provide a method for transmitting and receiving signals in a wireless vehicle communication system by determining a vehicle communication method by using vehicle communication configuration information.

[0033] According to one aspect of the present disclosure, a method for sending and receiving signals of a user equipment (UE) in a wireless vehicle communication system is provided. The method includes: acquiring vehicle communication configuration information; determining whether to relay at least one of data, allocated resources, or waveform for vehicle communication based on the acquired vehicle communication configuration information; and sending a signal to at least one other UE or receiving a signal from at least one other UE based on the determination result.

[0034] According to another aspect of the present disclosure, a UE is provided for sending and receiving signals in a wireless vehicle communication system. The UE includes a transceiver and a processor, and the processor is configured to: obtain vehicle communication configuration information; determine whether to relay at least one of data, allocated resources, or waveforms for vehicle communication based on the obtained vehicle communication configuration information; and send a signal to at least one other UE or receive a signal from at least one other UE based on the determination result.

[0035] Invention Mode

[0036] Various embodiments of the present disclosure will now be described in detail with reference to the accompanying drawings. In the following description, specific details such as detailed configuration and components are provided to help the overall understanding of these embodiments of the present disclosure. Therefore, it will be apparent to those skilled in the art that various changes and modifications may be made to the embodiments described herein without departing from the scope and spirit of the present disclosure. In addition, for clarity and brevity, descriptions of well-known functions and configurations are omitted.

[0037] 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.

[0038] In the accompanying drawings, the elements may be enlarged, omitted or schematically shown. Moreover, the size of each element may not fully reflect its actual size. In the accompanying drawings, the same reference numerals represent the same elements.

[0039] The blocks in the flowchart or the combination of flowcharts can be performed by computer program instructions. Since these computer program instructions can be loaded into a processor of a general-purpose computer, a special-purpose computer, or another programmable data processing device, these instructions executed by the processor of the computer or another programmable data processing device create units for performing the functions described in the (one or more) flowchart blocks. The computer program instructions can be stored in a computer-usable or computer-readable memory that can guide the computer or another programmable data processing device to implement the functions in a specific manner, and therefore the instructions stored in the computer-usable or computer-readable memory can also produce a manufacturing project containing an instruction unit, which is used to perform the functions described in the (one or more) flowchart blocks. The computer program instructions can also be loaded into a computer or another programmable data processing device, and therefore, when a series of operations are performed in a computer or other programmable data processing device, the instructions for operating the computer or other programmable data processing device by generating a computer-executed process can provide operations for performing the functions described in the (one or more) flowchart blocks.

[0040] In addition, each block can represent a module, segment or part of a code, which includes one or more executable instructions for performing a specified (one or more) logical function. In some alternative implementations, the functions mentioned in the block may not occur in order. For example, depending on the function corresponding thereto, two consecutive blocks may also be executed simultaneously or in reverse order.

[0041] As used herein, the term "unit" represents a hardware element or software element such as a field programmable gate array (FPGA) or an application specific integrated circuit (ASIC), and performs a certain function. However, the term "unit" is not limited to software or hardware. The unit can be formed to be located in an addressable storage medium, or can be formed to operate one or more processors. Therefore, for example, a unit can include an element (for example, a software element, an object-oriented software element, a class element, and a task element), a process, a function, an attribute, a process, a subroutine, a program code segment, a driver, a firmware, a microcode, a circuit, data, a database, a data structure, a table, an array, or a variable. The functions provided by the element and the unit can be combined into a smaller number of elements and units, or can be divided into additional elements and units. In addition, these elements and units can be implemented as one or more central processing units (CPUs) in a reproduction device or a secure multimedia card. Moreover, a unit can include at least one processor.

[0042] According to communication standards such as High Speed ​​Packet Access (HSPA), LTE or Evolved Universal Terrestrial Radio Access (E-UTRA), Advanced LTE (LTE-A), LTE-pro of 3GPP, High Rate Packet Data (HRPD) and Ultra Mobile Broadband (UMB) of 3GPP2, and 802.16e of the Institute of Electrical and Electronics Engineers (IEEE), wireless communication systems that provide voice-based services are being developed as broadband wireless communication systems that provide high-speed and high-quality packet data services. In addition, in order to meet the growing demand for wireless data traffic since the commercialization of 4G communication systems, efforts have been made to develop advanced 5G or NR communication systems.

[0043] As a representative example of a broadband wireless communication system, the LTE system uses OFDM for downlink (DL) and single carrier frequency division multiple access (SC-FDMA) for UL. UL refers to a radio link for transmitting data or control signals from a terminal, UE or mobile station (MS) to a gNode B or base station (BS), while DL refers to a radio link for transmitting data or control signals from a gNode B or BS to a terminal, UE or MS.

[0044] The above-mentioned multi-connectivity scheme distinguishes data or control information of different users by allocating and operating time-frequency resources carrying data or control information of users without overlapping each other, that is, achieving orthogonality between them.

[0045] The LTE system adopts a HARQ scheme by which the physical layer retransmits data that failed to be decoded at the time of initial transmission. In the HARQ scheme, when the receiver has not accurately decoded the data, the receiver can send information indicating the decoding failure (e.g., negative acknowledgment (NACK)) to the transmitter, in which case the physical layer of the transmitter can retransmit the data. The receiver improves the performance of data reception by combining the data retransmitted from the transmitter with the data that failed to be decoded previously. When the receiver has accurately decoded the data, the receiver can send information indicating the decoding success, e.g., acknowledgment (ACK), to the transmitter, in which case the transmitter can send new data.

[0046] Compared with the LTE system, the NR system supports various evolved technologies. Unlike the LTE system, the NR system can provide various subcarrier spacings and send data in units of symbols or symbol groups other than subframes. In addition, the NR system can retransmit in units of some code blocks, i.e., CBGs, instead of TBs. In addition, the NR system can flexibly configure HARQ-ACK timing and scheduling timing.

[0047] NR-V2X or 5G-V2X communication standards based on enhanced NR communication design are being studied. V2X communication is generally divided into V2I communication between vehicles and BS, V2V communication between vehicles and (one or more) other vehicles, and V2P communication between vehicles and people (or UEs). These three types of communication can be collectively referred to as V2X.

[0048] In vehicle communications, LTE-based V2X based on D2D communication structure has been defined in 3GPP standards Rel-14 and Rel-15. The biggest difference between V2X communication and D2D communication is the method of duplexing control information and data information. D2D basically supports time division multiplexing (TDM), while LTE-based V2X supports frequency division multiplexing (FDM). Efforts are being made to develop NR-based V2X communication technology based on 5G NR communication technology, which will be first disclosed in 3GPP Rel-15. Unlike LTE-based V2X communication, which aims to send and receive basic safety information required for vehicle driving, NR-based V2X communication aims to provide availability in four major vehicle driving environments, such as platoon driving, advanced driving, extended sensors, and remote driving. To support these, the NR-based V2X communication structure is designed to achieve lower latency and higher reliability. In vehicle communications, considering that vehicles travel at high speeds, the necessity of URLLC between vehicles or between vehicles and BS is increased.

[0049] Therefore, embodiments of the present disclosure provide a method and apparatus for simultaneously providing services of different types (or the same type). A method is provided by which a receiving vehicle relays data in a V2V communication environment based on whether the data is successfully received. A method is also provided for configuring resources for vehicle communications when frequency bands of LTE-V2X and NR-V2X coexist. A method is also provided for configuring transmit and receive waveforms for V2V communications. V2V communications can be replaced by V2X communications.

[0050] The present disclosure is not limited to a specific communication environment, and V2X is considered applicable to all communication environments.

[0051] As used herein, the term "vehicle" applies to UE and all other devices that support wireless data communication. UE-common control information may refer to system-common information that may be sent via a physical broadcast channel (PBCH) or a physical downlink shared channel (PDSCH), such as a master information block (MIB), a system information block (SIB), and remaining system information (RMSI), or may refer to UE group control information (e.g., downlink control information (DCI) format 2_x of NR) that may be sent via a physical downlink control channel (PDCCH) used as a UE group physical control channel. UE-specific control information may refer to UE-specific upper layer control information that may be sent via UE-specific upper layer signaling (e.g., radio resource control (RRC) signaling), or UE-specific control information that may be sent via PDCCH (e.g., DCI format 0_x or DCI format 1_x of NR).

[0052] Figure 1 A vehicle communication environment is shown.

[0053] refer to Figure 1 , vehicle A 104 and vehicle B 106 are located within a range where data communication with BS 102 can be performed. However, vehicle C 108, vehicle D 110, and vehicle E 112 are located outside a range where data communication with BS 102 can be performed. Link 122 and link 124 may be connected for direct data communication between vehicle A 104 and vehicle B 106 and BS 102. Here, each of link 122 and link 124 may be understood as DL or UL. Link 120 may be directly connected between vehicle A 104 and vehicle B 106. Here, link 120 may be understood as a side link (SL).

[0054] When vehicle A 104 has data to send to other vehicles, vehicle A 104 may send the data to vehicle B 106 or another vehicle(s) within the data communication range of BS 102 via BS 102. For example, vehicle A 104 may send data to BS 102 via UL 122. BS 102 may send data received from vehicle A 104 to vehicle B 106 via DL 124. Alternatively, BS 102 may configure resources for link 120 and vehicle A 104 may directly send data to vehicle B 106 via the resources.

[0055] When vehicle A 104 has data to be sent to other vehicles, vehicle A 104 can search for unused resources using resource areas configured using UE-specific or UE group control information previously received through upper layer signaling, resource areas configured according to standards, or resource areas configured by implementation methods without receiving any resource configuration information from BS 102, and then send the data to vehicle B 106 through the resources.

[0056] According to Rel-14 / 15 LTE-V2X, a method of transmitting or receiving data through SL resources allocated by a BS is defined as transmission mode 3, and a method of searching for an SL resource area configured using UE common control information without the help of a BS and then transmitting or receiving data through a specific resource area determined to be unused is defined as transmission mode 4. When the vehicle is within the data communication range of the BS, transmission mode 3 and transmission mode 4 can be supported. When the vehicle is outside the data communication range of the BS, only transmission mode 4 can be supported.

[0057] exist Figure 1 In the embodiment, it is assumed that vehicle B 106 and vehicle C 108 are connected to each other through SL 126, and vehicle B 106 is located within the BS data communication range, while vehicle C 108 is not located within the BS data communication range. In this case, communication between vehicle B 106 and vehicle C 108 can be performed through an unused resource area, which is determined by searching for a resource area that is configured using UE-specific or UE group control information previously received through upper layer signaling, configured according to a standard, or configured by an implementation without receiving any resource configuration information from BS 102. The above method can also be applied to a data communication process through link 128 between vehicle D 110 and vehicle E 112.

[0058] Specifically, during data communication, when the sending vehicle sends control information and data information through a specific resource, the receiving vehicle can implicitly check the control information detected by searching for a specific resource area, check information about, for example, the data resource area indicated by the control information and the data information transmission structure (e.g., modulation and coding scheme (MCS)), and then receive data in the data resource area. However, the above method corresponds only to an example, and according to another example, a method according to the existing LTE or NR standard can also be applied.

[0059] Although vehicle A 104 may send data directly to vehicle B 106 , vehicle A 104 may also send data to multiple vehicles instead of just one vehicle.

[0060] Figure 1 Data communication in can be performed using unicast, groupcast (multicast) or broadcast methods. The unicast method may refer to a method of sending data from a vehicle to another designated vehicle, the groupcast (multicast) method may refer to a method of sending data from a vehicle to multiple designated vehicles, and the broadcast method may refer to a method of sending data from a vehicle to multiple arbitrary vehicles. The data communication method can be configured using public or specific control information, or can be determined based on, for example, a radio network temporary identifier (RNTI) or a service type. For example, the vehicle can identify the configured data communication method based on the RNTI value masked in the cyclic redundancy check (CRC) bit included in the UE public or UE-specific control information previously received from the BS (or another vehicle).

[0061] Figure 2 A transmission resource structure for vehicle communications is shown.

[0062] refer to Figure 2 , reference numeral 200 denotes a transmission resource period including a group of frames having a specific subcarrier spacing value. In LTE, the value of the transmission resource period is set in units of 1024 frames (or 10240 subframes). Reference numeral 201 denotes UL, SL, or unlicensed band. Reference numeral 202 denotes a reserved resource area previously configured for critical information, or may not exist.

[0063] Reference numeral 204 denotes an SL resource region for V2V communication. Reference numeral 206 denotes a period during which the SL resource region 204 is repeated except for a frame for a synchronization signal (SS), a DL frame, or a frame configured as a reserved resource region among a group of frames included in a transmission resource period.

[0064] Reference numeral 210 indicates a configurable period of the SL resource area for V2V communication. The configurable period can be set in units of N subframes. In LTE, based on a time division duplex (TDD) or frequency division duplex (FDD) structure, the value N is set to 10 to 100. N bitmaps can be used to determine whether each subframe is used as an SL resource. Specifically, the N bitmaps can be set to Figure 1 One-to-one mapping to N subframes to indicate whether each subframe is used as a SL resource. That is, 1 bit can indicate whether 1 subframe is used for SL. For example, a subframe corresponding to a bit with a value of 1 (e.g., 214) is used as a SL resource, while a subframe corresponding to a bit with a value of 0 (e.g., 212) is not used as a SL resource. As another example, 1 bit can indicate whether 2 or more subframes are used for SL.

[0065] Reference numeral 216 denotes all logical resource regions of a subframe corresponding to a bit having a value of 1. A specific subframe mapped to 1 bit may include 12 or 14 OFDM symbols based on the cyclic prefix structure.

[0066] Frequency band 222 indicates a frequency resource region not used for SL, and frequency band 224 indicates a resource region used for SL. In LTE, frequency band 222 is used for a physical uplink control channel (PUCCH) or a physical uplink shared channel (PUSCH) of LTE. In LTE, transmission resource 226 may indicate a resource region through which a sounding reference signal (SRS) is transmitted. Alternatively, frequency band 222 and transmission resource 226 may not exist or only one of them may exist.

[0067] The frequency band 224 may include a combination of SL control channels (e.g., 236 and 246) and SL data channels (e.g., 234 and 244). Reference numeral 230 shows the SL control channels and the SL data channels repeatedly mapped to each other on the frequency axis. Each SL control channel (e.g., 236) may provide control information of an adjacent SL data channel (e.g., 234). Reference numeral 240 shows the SL control channels and the SL data channels grouped and mapped to each other on the frequency axis. Each SL control channel (e.g., 246) may provide control information of a SL data channel (e.g., 244) associated with the SL control channel.

[0068] The size of the frequency band 224 may be determined based on the length information and the frequency band offset included in the previously received UE common or UE specific control information. Alternatively, the size of the frequency band 224 may be determined based on information about the size and number of frequency bands for the SL control channel and the data channel, or using a combination of the above methods.

[0069] exist Figure 2, a frame or subframe can be replaced by a time slot containing 14 (or 12) symbols or a mini-time slot containing 1 to 13 symbols.

[0070] Figure 3 A data communication method between UEs according to an embodiment is shown.

[0071] refer to Figure 3 In vehicle communication, a vehicle (or UE or BS) can send data to other vehicles at a specific timing. For example, a vehicle (or UE or BS) can send data using a unicast, multicast, or broadcast method. As described above, the unicast method sends data to only one vehicle, the multicast method sends data to multiple specific vehicles, and the broadcast method sends data to multiple non-specific vehicles.

[0072] In order to support the various communication methods described above, the communication method can be identified based on the RNTI masked in the CRC bit combined with the control information or the data information. Alternatively, the communication method can be identified based on the UE common or UE specific upper layer control information or L1 control information. That is, the transmitting vehicle can identify whether the data information specified by the specific element included in the control information is unicast information for a specific receiving vehicle, multicast information for multiple specific receiving vehicles, or broadcast information for multiple non-specific receiving vehicles.

[0073] exist Figure 3 , vehicle A 300 repeatedly sends data to vehicle B 302 and vehicle C 304. In steps 306 and 308, vehicle A 300 may simultaneously send data to vehicle B 302 and vehicle C 304. In steps 310 and 312, vehicle A 300 retransmits previously sent data to vehicle B 302 and vehicle C 304. Although in Figure 3 It is assumed that the vehicle A 300 repeatedly transmits data twice, but the vehicle A 300 may repeatedly transmit data three or more times.

[0074] Vehicle A 300 may repeatedly transmit data having the same redundancy version (RV) value or data having different RV values. Vehicle B 302 or vehicle C 304 may decode the repeatedly received data after or without a combining process. After successfully decoding the data, vehicle B 302 or vehicle C 304 may not receive the repeatedly transmitted data, or may receive the repeatedly transmitted data but may not decode the data.

[0075] Figure 4 A cooperative communication method between UEs according to an embodiment is shown.

[0076] and Figure 3 different, Figure 4 An enhanced data communication method between vehicles is shown. Figure 3 In , only the sending vehicle repeatedly sends data to improve the data decoding performance of the receiving vehicle. Figure 4 In the embodiment, in addition to the sending vehicle, the receiving vehicle that has successfully decoded the data received from the sending vehicle can send the data through the resources used for repeated transmission of the sending vehicle.

[0077] For example, the receiving vehicle may relay previously received data regardless of whether the data is decoded. As another example, the receiving vehicle may relay data through resources other than resources used for repeated transmissions of the sending vehicle. The above method in which the receiving vehicle relays data received from the sending vehicle to other vehicles may be understood as a cooperative communication mode. When the cooperative communication mode is executed, the reliability and range of data transmission may be increased.

[0078] The receiving vehicle can adaptively send (or relay) the data received from the sending vehicle to other vehicles based on conditions. Such methods may include explicit methods and implicit methods. The explicit method determines whether to perform an operation by using specific information. When the information indicating whether to perform an operation does not exist, the implicit method determines whether to perform an operation based on information other than the information indicating whether to perform an operation.

[0079] According to the explicit method, whether to perform an operation (e.g., whether to relay received data) can be determined by using a field (which is included in the control information) indicating whether to perform an operation. For example, when the field indicating whether to relay received data is present in the control information and indicates relaying received data, and when the received data is successfully decoded, the receiving vehicle can relay the data. The control information may include a media access control (MAC) control element (CE) or RRC configuration information delivered through L2 or L3 signaling. As another example, the control information may include downlink control information delivered through L1 signaling.

[0080] As a first implicit method, a method based on RNTI scrambled in a CRC bit combined with control information to indicate whether to perform an operation (e.g., whether to relay received data) may be used. For example, when the receiving vehicle detects control information scrambled with an RNTI value configured for a group communication method or another specific communication method in the vehicle, the receiving vehicle may determine to relay the data information indicated by the control information. The control information may include MAC CE or RRC configuration information delivered via L2 or L3 signaling. As another example, the control information may include downlink control information delivered via L1 signaling.

[0081] As a second implicit method, a method may be used that indicates whether to perform an operation (e.g., whether to relay received data) based on a control information format or a control information transmission channel. For example, whether to relay data information indicated by the control information may be determined based on whether the control information format is a UE common control information format or a UE specific control information format. When the control information received by the receiving vehicle has a UE common control information format, a large number of vehicles should receive the data information, so the receiving vehicle may determine to relay the data information. Otherwise, when the control information received by the receiving vehicle has a UE specific control information format, only a few vehicles need to receive the data information, so the receiving vehicle may determine not to relay the data information.

[0082] The control information format may be determined based on the control information transmission channel. For example, the receiving vehicle may determine whether to relay data information based on whether the control information transmission channel is a UE common control channel or a UE specific control channel.

[0083] As a third implicit method, the receiving vehicle may determine whether to relay the data information indicated by the UE-specific control information based on the value indicated by a specific field in the fields included in the UE-specific control information. For reference, the following Table 1 shows the SL control information format fields used in LTE.

[0084] [Table 1]

[0085] Table 1 - LTE SL control information format fields

[0086]

[0087] The receiving vehicle may determine whether to relay the data information based on the value indicated by the control information field shown in Table 1. For example, "ReTx" is a field indicating whether the current transmission is initial transmission or retransmission, and includes 1 bit because LTE-V2X allows only two repeated transmissions. When the field indicates initial transmission, the receiving vehicle may determine to relay the data. Otherwise, when the field indicates retransmission, the current transmission is the last transmission, and thus the receiving vehicle may determine not to relay the data.

[0088] "Priority" is a field indicating the priority of the transmitted data. When the priority is high (or equal to or higher than the threshold), a large number of UEs should receive the data, and thus the receiving vehicle may determine to relay the data. Otherwise, when the priority is low (or lower than the threshold), the receiving vehicle may determine not to relay the data.

[0089] The above description corresponds to an example only. As another example, the receiving vehicle may adaptively determine whether to relay data based on the control information field of Table 1 or other SL control information fields.

[0090] As a fourth implicit method, the vehicle may determine whether to relay received data based on whether the data transmission method is unicast, multicast, or broadcast. For example, when the data received by the vehicle has been sent based on the unicast method, the vehicle may determine not to relay the received data. Otherwise, when the data received by the vehicle has been sent based on the broadcast or multicast method, the vehicle may determine to relay the received data.

[0091] As a fifth implicit method, the vehicle may determine whether to relay received data based on a resource area used for data transmission. The resource area may represent a resource area including frequency information or time information. The resource area may be previously configured by a BS, a service provider, or a standard. For example, when data information sent through a specific frequency resource area A is successfully received, the vehicle may determine to relay the received data. Even when data information sent through a specific frequency resource area B is received, the vehicle may determine not to relay the received data. Frequency resource areas A and B may not overlap with each other. Although described above using frequency resource areas as an example, time resource areas may also be used.

[0092] exist Figure 4 In steps 406 and 408, vehicle A 400 may transmit data information to vehicle B 402 and vehicle C 404 simultaneously. In steps 410 and 414, vehicle A 400 retransmits previously transmitted data to vehicle B 402 and vehicle C 404. Here, when the data received from vehicle A 400 in step 406 is successfully decoded in step 416, and when it is indicated that data is to be relayed, based on the above-mentioned explicit or implicit method, in step 412, vehicle B 402 may transmit data information to vehicle C 404 through the transmission resources (410 and 414) of vehicle A 400. As another example, vehicle B 402 may transmit data information to any vehicle through resources other than the transmission resources of vehicle A 400.

[0093] exist Figure 4 , there is no HARQ-ACK feedback channel, so vehicle A 400 may not be able to determine whether vehicle B 402 has successfully decoded the data. Therefore, in step 410, vehicle A 400 may also retransmit the data to vehicle B 402.

[0094] exist Figure 4 , each of vehicle B 402 and vehicle C 404 may represent one vehicle or a plurality of vehicles.

[0095] Despite Figure 3 and Figure 4In the example, vehicle A sends data to vehicle B and vehicle C, however, the above explicit and implicit methods can also be applied to any situation where vehicle A sends data to one or more vehicles.

[0096] Vehicle B 402 and vehicle C 404 may be specific vehicles previously identified by vehicle A 400, or non-specific vehicles not previously identified by vehicle A 400. When vehicle B 402 and vehicle C 404 are specific vehicles, data communication may be performed in a unicast or multicast manner. When vehicle B 402 and vehicle C 404 are non-specific vehicles, data communication may be performed in a broadcast manner.

[0097] Figure 5 is a flowchart illustrating an adaptive data communication method of a UE according to an embodiment.

[0098] refer to Figure 5 , in step 500, the vehicle searches for control information through a previously configured control channel.

[0099] In step 502 , when the control information is detected, the vehicle receives data in a data resource area indicated by the control information.

[0100] In step 504, the vehicle determines whether the received data is successfully decoded. In step 504, after determining that the data is successfully decoded, the vehicle may determine a data resource region for repeated transmission based on resource allocation information indicated by the control information.

[0101] In step 506, the vehicle transmits the successfully decoded data. The vehicle may transmit the successfully decoded data in the determined data resource area.

[0102] In step 508 , the vehicle re-receives the data that failed to be decoded, or terminates the reception of the data.

[0103] When data decoding fails in operation 504, the vehicle may determine a data resource region for repeated transmission based on resource allocation information indicated by the control information. The vehicle may re-receive the data that failed to be decoded in the determined data resource region. As another example, when data decoding fails and the current data transmission is the last transmission, the vehicle may terminate the reception of the data.

[0104] The vehicle may also consider conditions other than whether the data was successfully decoded. Figure 4 An explicit or implicit method of describing a method.

[0105] For example, when the control information includes information indicating whether to relay data, the vehicle may determine whether to relay received data based on the information. When the control information indicates that data is to be relayed, the vehicle may relay successfully decoded data. When the control information does not indicate that data is to be relayed, the vehicle may not relay data.

[0106] The determination of whether to relay data may be adaptively performed based on another condition such as RNTI, control information format, control information, control channel, or data channel. For example, when the control information or control channel is UE common information or channel, the UE may determine to relay data. As another example, when the control information or control channel is UE specific information or channel, the UE may determine not to relay data.

[0107] Figure 6 A resource allocation method for coexistence of LTE-V2X and NR-V2X according to an embodiment is shown.

[0108] As an example of vehicle communication, LTE-V2X and NR-V2X may have different features. For example, LTE-V2X enables data communication based on Turbo coding, while NR-V2X enables data communication based on LDPC coding. LTE-V2X and NR-V2X may have different subcarrier spacing values. LTE-V2X and NR-V2X based on different radio access technologies (RATs) may share the same frequency band or at least partially overlapped frequency bands.

[0109] Various methods of indicating the LTE-V2X resource area and the NR-V2X resource area may be used. For example, a bitmap configuration method or a method of selecting one of various resource modes may be used. As another example, the above description of Figure 2 Describes the resource allocation method.

[0110] In the bitmap configuration method, each bit indicates whether a symbol, a time slot, or a subframe is used as a resource for V2X. As another example, a method of repeating a time unit indicated by a bitmap within a certain period of time may be used. The resources used for V2X may be configured not to overlap with the resources used to transmit key system information (e.g., SS / PBCH) of LTE or NR.

[0111] In method 600, LTE-V2X resource information and NR-V2X resource information may be independently configured for a vehicle. The BS may provide the LTE-V2X resource information and the NR-V2X resource information as separate control information to vehicles within the coverage of the BS. The control information may be UE common control information or UE specific control information. The control information for resource configuration may not be configured by the BS, but may be configured based on a geographic location defined by a standard or organization.

[0112] When the frequency resource region 602 used for LTE-V2X communication is the same as the frequency resource region 604 used for NR-V2X communication, the LTE-V2X resource region 606 may be configured for the vehicle based on the UE common control information. In addition, the NR-V2X resource region 608 may be configured for the vehicle based on the UE common control information. In terms of time resources, in the LTE-V2X resource region, the vehicle may send or receive data related to the LTE-V2X service. In terms of time resources, in the NR-V2X resource region, the vehicle may send or receive data related to the NR-V2X service.

[0113] In terms of time resources, in the resource area where LTE-V2X resources overlap with NR-V2X resources, the vehicle can send or receive data related to LTE-V2X and NR-V2X services. The above operations can be enabled when the same RAT is used for LTE-V2X communication and NR-V2X communication.

[0114] As another example, in terms of time resources, in a resource area where LTE-V2X resources overlap with NR-V2X resources, the vehicle may only send or receive data related to LTE-V2X services. The above operation may be enabled when LTE-V2X services require sending and receiving basic vehicle safety information and therefore have a higher priority than NR-V2X services.

[0115] As another example, in terms of time resources, in a resource area where LTE-V2X resources overlap with NR-V2X resources, the vehicle may only send or receive data related to the NR-V2X service. The above operation may be enabled when the NR-V2X service has higher communication requirements and therefore requires a large amount of resources compared to the LTE-V2X service.

[0116] LTE-V2X service may refer to a type of service for communication over an LTE-V2X network and include basic safety-related messages for vehicle communication. NR-V2X service may refer to a type of service for communication over an NR-V2X network and include services with communication requirements (e.g., high data rate, low latency, and high reliability) that LTE-V2X cannot provide.

[0117] In method 610, LTE-V2X resources may be preferentially configured for the vehicle, and then NR-V2X resources may be configured in at least a portion of a resource region not used for LTE-V2X communication. For example, NR-V2X resources may be preferentially configured for the vehicle, and then LTE-V2X resources may be configured in a resource region not used for NR-V2X communication. That is, although in method 600, LTE-V2X resources may at least partially overlap with NR-V2X resources in terms of time resources, no overlap occurs in method 610.

[0118] When the frequency resource area 612 used for LTE-V2X communication is the same as the frequency resource area 614 used for NR-V2X communication, the LTE-V2X resource area 616 can be configured for the vehicle based on the UE public control information. For example, a bitmap method can be used as a resource configuration method. In the bitmap method, each bit can indicate whether a symbol, a time slot or a subframe is used for LTE-V2X communication. In the resource area 617 remaining after excluding the LTE-V2X resource area 616, the NR-V2X resource area 618 can be configured separately for the vehicle based on the UE public control information. For example, a bitmap method can be used as a resource configuration method. The bitmap size can vary depending on the remaining resource area 617, or the same bitmap size can be maintained, and the information period indicated by each bit can be changed or some bits can be not used.

[0119] As an example of a bitmap size that varies depending on the remaining resource region 617, when each bit is mapped to a subframe and the remaining resource region 617 has N subframes, the bitmap size may correspond to N bits. As an example of an information period indicated by each bit changing, when the remaining resource region 617 has a size of T subframes, N bits of the bitmap are sequentially mapped to When T is less than N, some of the N bits in the bitmap may not be used to indicate the resource information of V2X.

[0120] Although each bit is mapped to a subframe in the above description, according to another example, each bit may be mapped to various time-period units such as a slot, a symbol, or a symbol group.

[0121] In method 620, all time periods except the time period indicated as the LTE-V2X resource area are configured as the NR-V2X resource area. When only the LTE-V2X resource configuration information is received, the vehicle can determine to configure the area not indicated as the LTE-V2X resource area as the NR-V2X resource area. The above operation can be applied to resource areas other than the resource areas that cannot be used for LTE-V2X communication or NR-V2X communication. Examples of resource areas that cannot be used include resource areas for sending key system information such as SS / PBCH, resource areas reserved for future services, and resource areas configured for DL ​​in TDD through high-layer signaling.

[0122] When the frequency resource region 622 used for LTE-V2X communication is the same as the frequency resource region 622 used for NR-V2X communication, the LTE-V2X resource region 624 may be configured for the vehicle based on the UE common control information. The vehicle may implicitly determine the resource region 626 not configured for LTE-V2X communication as the NR-V2X resource region. Although in the above description the vehicle receives the LTE-V2X resource configuration information and implicitly determines the NR-V2X resource region, the vehicle may receive the NR-V2X resource configuration information and implicitly determine the LTE-V2X resource region.

[0123] As another example, when the frequency resource region 622 used for LTE-V2X communication is the same as the frequency resource region 622 used for NR-V2X communication, the LTE-V2X resource region 624 may be configured for the vehicle based on the UE common control information. When configuring LTE-V2X resources using the bitmap method, the vehicle may configure resources corresponding to bits having a value of 1 for NR-V2X communication, and may configure resources corresponding to bits having a value of 0 for LTE-V2X communication.

[0124] Figure 7 is a flowchart illustrating UE operation in a resource allocation method for coexistence of LTE-V2X and NR-V2X according to an embodiment.

[0125] A vehicle supporting both LTE-V2X and NR-V2X may receive UE common control information in a previously configured resource area, and the received UE common control information may include LTE-V2X resource information or NR-V2X resource information.

[0126] refer to Figure 7 In step 700, the vehicle receives upper layer control information including LTE-V2X resource information.

[0127] In step 702, the vehicle receives upper layer control information including NR-V2X resource information.

[0128] In step 704, the vehicle determines LTE-V2X and NR-V2X resource areas.

[0129] exist Figure 6 In method 600, the LTE-V2X resource information and the NR-V2X resource information operate independently of each other, and therefore, the vehicle can determine that the LTE-V2X resources and the NR-V2X resources are separately configured based on two pieces of resource information.

[0130] When LTE-V2X resources overlap with NR-V2X resources, the vehicle may determine both as used resources and send or receive data, or may determine only one of the two as a used resource and send or receive data through the corresponding V2X resource.

[0131] exist Figure 6 In method 610, the other of the two resource allocation information may be determined based on one of the resource allocation information. For example, the UE may receive LTE-V2X resource configuration information and then determine a resource region that is not configured as an LTE-V2X resource as an NR-V2X resource region. The UE may use the LTE-V2X resource configuration information and the NR-V2X resource configuration information received using different control information, unlike Embodiment 3-1 of the present disclosure.

[0132] For example, the candidate resource region for the NR-V2X resource region may correspond to a resource region that is not indicated as an LTE-V2X resource region. According to the above method, the candidate resource region that may be indicated as an LTE-V2X resource may not be changed, but the candidate resource region that may be indicated as an NR-V2X resource may be changed. Because the candidate resource region may be changed, the time resource region that may be indicated by the bitmap for configuring the NR-V2X resource may also be changed. Therefore, the time resource region including the symbol or time slot indicated by the bit of the bitmap may be changed.

[0133] Figure 8 is a flowchart illustrating UE operation in a resource allocation method for coexistence of LTE-V2X and NR-V2X according to an embodiment.

[0134] LTE-V2X and NR-V2X can share the same frequency band but will not be used simultaneously in the time resource area.

[0135] refer to Figure 8 In step 802, the vehicle receives upper layer control information including LTE-V2X resource information.

[0136] In step 804, the vehicle determines an LTE-V2X resource area and an NR-V2X resource area based on the LTE-V2X resource information. The vehicle may determine a resource area not used for LTE-V2X communication as an NR-V2X resource area.

[0137] For example, assuming that the set of all resource regions that can be allocated for LTE-V2X communication is represented by A, when B represents the LTE-V2X resource region in resource region A, the NR-V2X resource region C can be configured as AB or the complement of B. That is, it can be established that C∈A, B∈A, and C=B c Here, A may correspond to a resource region other than a resource region allocated for a previously configured synchronization signal transmitted for V2X and a broadcast channel for transmitting UE common control information. In addition, A may correspond to a resource region other than a resource region reserved for future use or a resource region used for DL ​​(or a resource region configured for a non-UL link).

[0138] Fig. 9 A method of indicating a waveform used in a transmission resource area and a reception resource area of ​​a vehicle according to an embodiment is illustrated.

[0139] Fig. 9 The resource areas (or resource pools) that can be configured for a vehicle based on upper layer control information from a BS or based on a geographical location are shown. The resource areas can be divided into a sending resource area in which the vehicle sends data and a receiving resource area in which the vehicle receives data. The sending and receiving resource areas can have the same or different frequency resource areas. One or more resource areas can be configured at the same time.

[0140] The number of resource regions configured as transmit resource regions may be the same as or different from the number of resource regions configured as receive resource regions.The transmit resource regions may have the same or different sizes, and the receive resource regions may have the same or different sizes.

[0141] The waveform of a vehicle supporting NR-V2X can support OFDM and DFT-s-OFDM or SC-FDMA. OFDM can provide higher performance than DFT-s-OFDM, but requires a lot of power consumption at the transmitter. When the sender vehicle and the receiver vehicle perform data communication by taking different waveforms between them, proper data communication may not be performed. Therefore, the sender vehicle and the receiver vehicle perform data communication by taking the same waveform between them. A method for implementing the above operation will now be described.

[0142] In the first method for using the same waveform for the transmitting vehicle and the receiving vehicle, the BS may indicate the waveform for data communication of the vehicle based on the UE common upper layer control information. For example, the BS may signal the waveform for data communication of the vehicle at a specific timing based on NR-RMSI or MIB.

[0143] In the second method for the sender vehicle and the receiver vehicle to use the same waveform, the BS may signal a waveform for data communication of the vehicles based on message 2 or message 4 in a random access procedure for synchronization acquisition and data communication.

[0144] In a third method for a transmitting vehicle and a receiving vehicle to use the same waveform, the BS may signal a resource region (or resource pool) for data communication of the vehicles by using a waveform associated with the resource region based on UE common upper layer control information.

[0145] refer to Fig. 9 When the BS indicates the sending resource area as resource areas A900 and B902, and indicates the receiving resource area as resource areas A900, B 902 and C 904 based on the UE common upper layer control information, resource areas A900 and C 904 can be configured for sending and receiving data by using DFT-S-OFDM, and resource area B 902 is configured for sending and receiving data by using OFDM.

[0146] In the fourth method for the sender vehicle and the receiver vehicle to use the same waveform, when the resource area is determined based on the geographical location, data communication may be performed using the waveform associated with the resource area.

[0147] For example, in Fig. 9 In the example of FIG. 1 , when data communication is performed through resource area A 900 in area a, data communication is performed through resource area B 902 in area b, and data communication is performed through resource area C 904 in area c, the vehicle may use a waveform determined for each resource area without previous signaling. Examples of the waveform used without previous signaling may include a waveform defined for each resource area by the standard and a waveform defined for each resource area by a country or a service provider.

[0148] In a fifth method for the sender vehicle and the receiver vehicle to use the same waveform, data communication may be performed using a waveform configured based on a communication mode in which the vehicles operate.

[0149] LTE-V2X includes Mode 3, in which a vehicle performs communication through resources allocated by a BS, and Mode 4, in which a vehicle senses and uses resources without intervention of a BS. A vehicle may perform data communication by applying OFDM or DFT-S-OFDM based on the mode in which the vehicle operates. For example, a vehicle may perform data communication in Mode 3 by using OFDM, and perform data communication in Mode 4 by using DFT-S-OFDM.

[0150] Alternatively, when LTE / NR includes a connected mode and an idle mode, the vehicle can perform data communication by applying OFDM or DFT-S-OFDM based on the mode. For example, the vehicle can perform data communication by using OFDM in the connected mode and perform data communication by using DFT-S-OFDM in the idle mode.

[0151] LTE-V2X may also include an in-coverage mode in which the vehicle operates within the coverage of the BS and an out-of-coverage mode in which the vehicle operates outside the coverage of the BS. The vehicle may perform data communication by applying OFDM or DFT-S-OFDM based on the in-coverage mode or the out-of-coverage mode. For example, the vehicle may perform data communication by using OFDM in the in-coverage mode, and may perform data communication by using DFT-S-OFDM in the out-of-coverage mode.

[0152] In a sixth method for the sender vehicle and the receiver vehicle to use the same waveform, data communication may be performed using a waveform configured based on a communication mode in which the vehicles operate.

[0153] LTE-V2X includes Mode 3, in which a vehicle performs communication through resources allocated by a BS, and Mode 4, in which a vehicle senses and uses resources without intervention of a BS. A vehicle may perform data communication by applying OFDM or DFT-S-OFDM based on the mode in which the vehicle operates. A vehicle may perform data communication in Mode 3 by using DFT-S-OFDM, and may perform data communication in Mode 4 by using OFDM.

[0154] As another example, when LTE / NR includes a connected mode and an idle mode, the vehicle can perform data communication by applying OFDM or DFT-S-OFDM based on the mode. The vehicle can perform data communication by using DFT-S-OFDM in the connected mode, and can perform data communication by using OFDM in the idle mode.

[0155] As another example, when LTE-V2X includes an in-coverage mode in which a vehicle operates within the coverage of a BS and an out-of-coverage mode in which a vehicle operates outside the coverage of the BS, the vehicle may perform data communication by applying OFDM or DFT-S-OFDM based on the mode. The vehicle may perform data communication by using DFT-S-OFDM in the in-coverage mode, and may perform data communication by using OFDM in the out-of-coverage mode.

[0156] Although OFDM or DFT-S-OFDM is described above as an example, other waveforms may also be applied, and when two or more waveforms are supported, the above method may also be applied. The waveform may also be applied in a manner opposite to the aforementioned embodiment of the present disclosure.

[0157] Fig.10 is a flow chart illustrating a waveform selection method for data communication of a UE in transmission according to an embodiment.

[0158] refer to Fig.10 , in step 1000, the UE prepares to send data.

[0159] In step 1002, the UE determines whether a condition indicates a SL transmission waveform as DFT-S-OFDM or Cyclic Prefix-OFDM (CP-OFDM).

[0160] For example, the condition may be whether information provided from the BS through upper layer signaling indicates the SL transmission waveform as DFT-S-OFDM or CP-OFDM. The SL transmission waveform may be indicated using 1 bit.

[0161] In step 1004, when DFT-S-OFDM is indicated, the UE transmits data by using DFT-S-OFDM.

[0162] In step 1006, when CP-OFDM is indicated, the UE transmits data by using CP-OFDM.

[0163] As another example, the condition may be whether the information included in message 1 or message 3 in the random access procedure indicates the SL transmission waveform as DFT-S-OFDM or CP-OFDM. When DFT-S-OFDM is indicated, the UE may transmit data by using DFT-S-OFDM. When CP-OFDM is indicated, the UE may transmit data by using CP-OFDM.

[0164] As another example, the condition may be whether the information indicated in association with the resource region configured by the upper layer signaling indicates the SL transmission waveform as DFT-S-OFDM or CP-OFDM. When the UE expects to send data through a specific resource region, the SL transmission waveform configured for the resource region may be applied. When the SL transmission waveform configured for the resource region is indicated as DFT-S-OFDM, the UE may send data by using DFT-S-OFDM. When the SL transmission waveform configured for the resource region is indicated as CP-OFDM, the UE may send data by using CP-OFDM.

[0165] As another example, the condition may be whether the information indicated in association with the resource region configured based on the UE common upper layer control information indicates the SL transmit waveform as DFT-S-OFDM or CP-OFDM. When the UE expects to send data through a specific resource region, the SL transmit waveform configured for the resource region may be applied. When the SL transmit waveform configured for the resource region is indicated as DFT-S-OFDM, the UE may send data by using DFT-S-OFDM. When the SL transmit waveform configured for the resource region is indicated as CP-OFDM, the UE may send data by using CP-OFDM. The resource region may be configured based on the UE common upper layer control information, or the resource region may be previously defined based on a geographical location.

[0166] As another example, the condition may be about indicating the SL transmission waveform as DFT-S-OFDM or CP-OFDM based on Mode 3 or Mode 4, in which the UE requests SL resources from the BS and transmits data through resources allocated by the BS, and in which the UE transmits data through resources autonomously sensed and determined to be unused. The UE may transmit data by using DFT-S-OFDM in Mode 3 or by using CP-OFDM in Mode 4. The waveform mapped to each mode may be configured by the BS or determined by a service provider or a standard.

[0167] As another example, the condition may be about whether the SL transmission waveform is indicated as DFT-S-OFDM or CP-OFDM based on an in-coverage mode in which the UE is within the coverage of the BS and an out-of-coverage mode in which the UE is not within the coverage of the BS. The UE may use DFT-S-OFDM in the out-of-coverage mode or CP-OFDM in the in-coverage mode. The waveform mapped to each mode may be configured by the BS or determined by a service provider or a standard.

[0168] Fig.11 is a flow chart illustrating a waveform selection method for data communication of a UE on a receiving side according to an embodiment.

[0169] refer to Fig.11 , in step 1100, the UE prepares to receive data before determining a waveform of a signal received by a radio frequency (RF) front end.

[0170] In step 1102, the UE determines whether the condition indicates the SL reception waveform as DFT-S-OFDM or CP-OFDM.

[0171] For example, the condition may be whether the information provided from the BS through the higher layer signaling indicates the SL reception waveform as DFT-S-OFDM or CP-OFDM. Here, the SL reception waveform may be indicated using 1 bit.

[0172] In step 1104, when DFT-S-OFDM is indicated, the UE receives data by using DFT-S-OFDM.

[0173] In step 1106, when CP-OFDM is indicated, the UE receives data by using CP-OFDM.

[0174] As another example, the condition may be whether the information included in message 1 or message 3 in the random access procedure indicates the SL reception waveform as DFT-S-OFDM or CP-OFDM. When DFT-S-OFDM is indicated, the UE may receive data by using DFT-S-OFDM. When CP-OFDM is indicated, the UE may receive data by using CP-OFDM.

[0175] As another example, the condition may be whether the information indicated in association with the resource region configured by high-layer signaling indicates the SL reception waveform as DFT-S-OFDM or CP-OFDM. When the UE expects to receive data through a specific resource region, the SL reception waveform configured for the resource region may be applied. When the SL reception waveform configured for the resource region is indicated as DFT-S-OFDM, the UE may receive data by using DFT-S-OFDM. When the SL reception waveform configured for the resource region is indicated as CP-OFDM, the UE may receive data by using CP-OFDM.

[0176] As another example, the condition may be whether the information indicated in association with the resource region configured based on the UE common upper layer control information indicates the SL receive waveform as DFT-S-OFDM or CP-OFDM. When the UE expects to receive data through a specific resource region, the SL receive waveform configured for the resource region may be applied. For example, when the SL receive waveform configured for the resource region is indicated as DFT-S-OFDM, the UE may receive data by using DFT-S-OFDM. When the SL receive waveform configured for the resource region is indicated as CP-OFDM, the UE may receive data by using CP-OFDM. The resource region may be configured based on the UE common upper layer control information, or the resource region may be previously defined based on a geographical location.

[0177] As another example, the condition may be about indicating the SL reception waveform as DFT-S-OFDM or CP-OFDM based on an in-coverage mode in which the UE is within the coverage of the BS, and an out-of-coverage mode in which the UE is not within the coverage of the BS. The UE may use DFT-S-OFDM in the out-of-coverage mode, or use CP-OFDM in the in-coverage mode. The waveform mapped to each mode may be configured by the BS, or may be determined by a service provider or a standard.

[0178] Fig.12 is a flowchart illustrating a signal transmission and reception method of a UE in a wireless vehicle communication system according to an embodiment.

[0179] refer to Fig.12 In step 1210, the UE obtains vehicle communication configuration information.

[0180] The vehicle communication configuration information may be included in at least one of MAC CE, RRC configuration information, or DL ​​control information. As another example, the vehicle communication configuration information may be included in a message received in a random access procedure.

[0181] However, the above description corresponds only to an example, and the UE may implicitly acquire the vehicle communication configuration information by identifying at least one of the RNTI scrambled in the control information including at least one of the MAC CE, the RRC configuration information, or the DL control information, the format of the control information, the transmission channel of the control information, the transmission method of the data, or the transmission resource of the data. Alternatively, the UE may implicitly acquire the vehicle communication configuration information by identifying the vehicle communication mode of the UE, which is determined based on at least one of the location of the UE, the intervention of the BS in the vehicle communication, the operating location of the UE based on the coverage, or the establishment of a wireless connection between the UE and the BS.

[0182] In step 1220 , the UE determines whether to relay at least one of data, allocated resources, or a waveform for vehicle communication based on the acquired vehicle communication configuration information.

[0183] For example, the UE may determine whether to relay data received by the UE to at least one other UE based on the vehicle communication configuration information. The method by which the UE determines whether to relay data may correspond to the above description of Figure 4 and Figure 5 Describe the method.

[0184] As another example, the UE may determine resources for the first type of vehicle communication and resources for the second type of vehicle communication based on the vehicle communication configuration information. The method by which the UE determines resources for each type of vehicle communication may correspond to the above description of Figures 6 to 8 Describe the method.

[0185] As another example, the UE may determine a waveform for vehicle communication based on the vehicle communication configuration information. The method for the UE to determine the waveform may correspond to the above Figures 9 to 11 Describe the method.

[0186] In step 1230, the UE transmits a signal to or receives a signal from at least one other UE based on the determination result.

[0187] Fig.13 A UE according to an embodiment is shown.

[0188] refer to Fig.13 , UE 1300 includes a transceiver 1310, a processor 1320 and a memory 1330.

[0189] The transceiver 1310 may be separated into a transmitter and a receiver.

[0190] The transceiver 1310 may send or receive signals to or from a BS or other UEs. The signals may include control information and data. The transceiver 1310 may include: an RF transmitter for up-converting the frequency of a signal to be sent and amplifying it; and an RF receiver for low-noise amplifying the received signal and down-converting the frequency of the received signal. The transceiver 1310 may receive a signal through a wireless channel, provide the signal to the processor 1320, and transmit a signal output from the processor 1320 through a wireless channel.

[0191] The processor 1320 may control a series of processes to operate the UE 1300 according to the above-described embodiments of the present disclosure.

[0192] The memory 1330 may store vehicle communication configuration information, control information, or data, and has an area for storing data required and generated due to the control operation of the processor 1320. The memory 1330 may be configured in various forms, for example, a read-only memory (ROM), a random access memory (RAM), a hard disk, a compact disk (CD)-ROM, and a digital versatile disk (DVD).

[0193] Fig.14 A BS according to an embodiment is shown.

[0194] refer to Fig.14 , BS 1400 includes a transceiver 1410 , a processor 1420 , and a memory 1430 .

[0195] The transceiver 1410 may be separated into a transmitter and a receiver.

[0196] The transceiver 1410 may send a signal to or receive a signal from the UE. The signal may include control information and data. The transceiver 1410 may include: an RF transmitter for up-converting the frequency of the signal to be sent and amplifying it; and an RF receiver for low-noise amplifying the received signal and down-converting the frequency of the received signal. The transceiver 1410 may receive a signal through a wireless channel, provide the signal to the processor 1420, and send a signal output from the processor 1420 through a wireless channel. The processor 1420 may control a series of processes to operate the BS 1400 according to the above-mentioned embodiment of the present disclosure.

[0197] The memory 1430 may store vehicle communication configuration information, control information or data, and has an area for storing data required and generated due to the control operation of the processor 1420. The memory 1430 may be configured in various forms, for example, ROM, RAM, hard disk, CD-ROM, and DVD.

[0198] The above embodiments should be considered in a descriptive sense only and not for the purpose of limitation. That is, it will be understood by those skilled in the art that various changes in form and details may be made in the embodiments of the present disclosure without departing from the scope defined by the appended claims.

[0199] The embodiments of the present disclosure may be combined as needed. For example, the BS and the UE may operate according to a combination of parts of the embodiments of the present disclosure.

[0200] Although the embodiments of the present disclosure have been described with reference to an NR system, the embodiments are also applicable to other systems such as an FDD or TDD LTE system.

[0201] According to the present disclosure, by configuring the vehicle communication method (for example, whether to relay data, allocated resources and waveform) based on the vehicle communication configuration information in the wireless vehicle communication system, the reliability of data transmission can be improved and different communication types can be adaptively configured for the UE.

[0202] Although specific terms have been used to describe various embodiments of the present disclosure with reference to the accompanying drawings, these terms are only for convenience of explanation and better understanding of the present disclosure and do not limit the scope of the present disclosure.

[0203] While the present disclosure has been particularly shown and described with reference to certain embodiments thereof, it will be understood by those skilled in the art that various changes in form and details may be made without departing from the spirit and scope of the present disclosure as defined by the appended claims and their equivalents.

Claims

1. A method performed by a user equipment UE in a wireless communication system, the method comprising: Obtain vehicle communication configuration information based on high-level signaling; as well as Based on the vehicle communication configuration information, in a case where a first signal using a first network and a second signal using a second network overlap in time, only a signal having a higher priority among the first signal and the second signal is received, wherein the first network is associated with a Long Term Evolution Vehicle-to-Everything LTE-V2X system, the second network is associated with a New Radio Vehicle-to-Everything NR-V2X system, and The time slots used for V2X resources include time slots other than time slots associated with the synchronization signal SS or the physical broadcast channel PBCH.

2. The method of claim 1, further comprising: identifying resources associated with the resource allocation of the first network and resources associated with the resource allocation of the second network, Wherein, resources associated with resource allocation are defined by time-frequency resource regions based on the vehicle communication configuration information.

3. The method of claim 2, wherein: identifying resources associated with a resource allocation for the first network based on resource information for the first network from the vehicle communication configuration information, and Wherein, resources associated with resource allocation of the second network are identified based on resource information of the second network from the vehicle communication configuration information.

4. The method according to claim 2, in, A waveform is defined based on the identified resources associated with the resource allocation of the first network.

5. A user equipment UE in a wireless communication system, the UE comprising: Transceiver; as well as The processor is configured as: Obtain vehicle communication configuration information based on high-level signaling, and Based on the vehicle communication configuration information, in a case where a first signal using a first network and a second signal using a second network overlap in time, only a signal having a higher priority among the first signal and the second signal is received, wherein the first network is associated with a Long Term Evolution Vehicle-to-Everything LTE-V2X system, the second network is associated with a New Radio Vehicle-to-Everything NR-V2X system, and The time slots used for V2X resources include time slots other than time slots associated with the synchronization signal SS or the physical broadcast channel PBCH.

6. The UE according to claim 5, wherein: The processor is further configured to: identifying resources associated with the resource allocation of the first network and resources associated with the resource allocation of the second network, and Wherein, resources associated with resource allocation are defined by time-frequency resource regions based on the vehicle communication configuration information.

7. The UE according to claim 6, wherein: identifying resources associated with a resource allocation for the first network based on resource information for the first network from the vehicle communication configuration information, and Wherein, resources associated with resource allocation of the second network are identified based on resource information of the second network from the vehicle communication configuration information.

8. The UE according to claim 6, wherein: A waveform is defined based on the identified resources associated with the resource allocation of the first network.

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