Apparatus and method for resource management in a wireless communication system

Abstract

The present disclosure provides an apparatus and method for resource management in a wireless communication system. The present disclosure relates to a quasi-fifth generation (5G) or 5G communication system for supporting higher data rates beyond 4th generation (4G) communication systems (such as, long term evolution (LTE)). According to various embodiments of the present disclosure, an apparatus of a base station in this wireless communication system includes: at least one transceiver; and at least one processor operably coupled to at least one transceiver, wherein the at least one processor is configured to: obtain a channel quality of a first vehicle device; obtain a resource allocation area of ​​the first vehicle device based on the channel quality; and send allocation information related to a transmission resource determined in the resource allocation area to the first vehicle device, wherein the transmission resource is used by the first vehicle device to send a message to a second vehicle device.

Description

Technical Field

[0001] The present disclosure relates to a wireless communication system and more particularly to an apparatus and method for resource management in a wireless communication system. Background Art

[0002] In order to meet the demand for wireless data services that has increased since the deployment of the 4th generation (4G) communication system, efforts have been made to develop improved fifth generation (5G) or pre-5G communication systems. Therefore, 5G or pre-5G communication systems are also called "beyond 4G networks" or "post-long term evolution (LTE) systems".

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

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

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

[0006] Various communication services using vehicles are being provided. Messages are defined to smoothly communicate using vehicles (hereinafter referred to as vehicle-to-everything (V2X) communication), such as communication between vehicles, communication between a vehicle and a terminal, or communication between a vehicle and a building. When resource allocation is performed independently in each base station, a conflict occurs between message transmissions of respective vehicles connected to different base stations.

[0007] The above information is presented as background information only to assist with understanding the present disclosure. No determination has been made, and no assertion is made, as to whether any of the above information may be used as prior art with respect to the present disclosure. Summary of the invention

[0008] Aspects of the present disclosure are to solve at least the above problems and / or disadvantages and to provide at least the advantages described below. Therefore, an aspect of the present disclosure is to provide an apparatus and method for reducing collision in message transmission of a vehicle device located at a cell edge in a wireless communication system.

[0009] Another aspect of the present disclosure is to provide an apparatus and method for resource management of a vehicle device in a wireless communication system.

[0010] Another aspect of the present disclosure is to provide an apparatus and method for performing resource allocation through a base station based on a location of a vehicle device in a wireless communication system.

[0011] Another aspect of the present disclosure is to provide an apparatus and method for performing resource selection by a terminal based on a location of a vehicle device in a wireless communication system.

[0012] 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 embodiments.

[0013] According to one aspect of the present disclosure, an operating method of a base station in a wireless communication system includes: obtaining a channel quality of a first vehicle device; determining a resource allocation area of ​​the first vehicle device based on the channel quality; and sending allocation information related to a transmission resource determined in the resource allocation area to the first vehicle device, wherein the transmission resource is used by the first vehicle device to send a message to a second vehicle device.

[0014] According to another aspect of the present disclosure, a method for operating a vehicle device in a wireless communication system is provided. The method includes: performing energy sensing; receiving resource allocation information related to a transmission resource; determining whether the transmission resource is being used by other nodes based on the energy sensing; when the transmission resource is being used by the other node, sending a message to a second vehicle device on an available channel acquired through the energy sensing; and when the transmission resource is not being used by the other node, sending a message to the second vehicle device on the transmission resource.

[0015] According to another aspect of the present disclosure, a device of a base station in a wireless communication system is provided. The device includes: at least one transceiver; and at least one processor operably coupled to the at least one transceiver, wherein the at least one processor is configured to: obtain a channel quality of a first vehicle device; determine a resource allocation area of ​​the first vehicle device according to the channel quality; and send allocation information related to a transmission resource determined in the resource allocation area to the first vehicle device, wherein the transmission resource is used by the first vehicle device to send a message to a second vehicle device.

[0016] According to another aspect of the present disclosure, a first vehicle device in a wireless communication system is provided. The first vehicle device includes: at least one transceiver; and at least one processor operably coupled to the at least one transceiver, wherein the at least one processor is configured to: perform energy sensing; receive resource allocation information related to a transmission resource; determine whether the transmission resource is being used by other nodes based on the energy sensing; when the transmission resource is being used by the other node, send a message to a second vehicle device on an available channel acquired through the energy sensing; and when the transmission resource is not being used by the other node, send a message to the second vehicle device on the transmission resource.

[0017] The device and method according to various embodiments of the present disclosure enable avoiding collision between message transmissions of vehicle devices connected to different base stations by configuring a dedicated resource region in a base station.

[0018] The device and method according to various embodiments of the present disclosure enable a message of a vehicle device to be more accurately transmitted by sensing a channel allocated to another vehicle device.

[0019] The effects that can be obtained by the present disclosure are not limited to the above effects, and those skilled in the art can clearly understand other effects not mentioned through the following description. According to the specific implementation of various embodiments of the present disclosure disclosed below in conjunction with the accompanying drawings, other aspects, advantages and salient features of the present disclosure will become apparent to those skilled in the art. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] The above and other aspects, features and advantages of certain embodiments of the present disclosure will become more apparent through the following description in conjunction with the accompanying drawings, in which:

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

[0022] Figure 2 A block diagram of a base station in a wireless communication system according to an embodiment of the present disclosure is shown;

[0023] Figure 3 A block diagram of a vehicle device in a wireless communication system according to an embodiment of the present disclosure is shown;

[0024] Figure 4 An example of message transmission by a vehicle device located at a cell edge in a wireless communication system according to an embodiment of the present disclosure is shown;

[0025] Figure 5 A flowchart showing an operation of performing location-based resource allocation by a base station in a wireless communication system according to an embodiment of the present disclosure;

[0026] Figure 6 A flowchart showing an operation of determining a resource region by a base station in a wireless communication system according to an embodiment of the present disclosure;

[0027] Fig. 7A A flowchart showing an operation of determining a specific resource area by a base station in a wireless communication system according to an embodiment of the present disclosure;

[0028] Figure 7B A flowchart showing an operation of determining a specific resource area by a base station in a wireless communication system according to an embodiment of the present disclosure;

[0029] Figure 8 An example of location-based resource allocation in a wireless communication system according to an embodiment of the present disclosure is shown;

[0030] Fig. 9 A flowchart showing an operation of performing energy sensing-based resource selection by a vehicle device in a wireless communication system according to an embodiment of the present disclosure; and

[0031] Fig.10 An example of resource selection based on energy sensing in a wireless communication system according to an embodiment of the present disclosure is shown.

[0032] Throughout the drawings, it should be noted that like reference numbers are used to depict the same or similar elements, features, and structures. DETAILED DESCRIPTION

[0033] The following description with reference to the accompanying drawings is provided to assist in a comprehensive understanding of the various embodiments of the present disclosure as defined by the claims and their equivalents. It includes various specific details to assist in understanding, but these specific details 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, descriptions of well-known functions and configurations may be omitted for clarity and brevity.

[0034] The terms and words used in the following description and claims are not limited to the bibliographical meanings, but are merely used by the inventor to enable a clear and consistent understanding of the present disclosure. Therefore, it will be apparent to those skilled in the art that the following description of various embodiments of the present disclosure is provided for illustrative purposes only and not for the purpose of limiting the present disclosure as defined by the appended claims and their equivalents.

[0035] It should 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.

[0036] Hereinafter, various embodiments will be described based on a hardware approach. However, various embodiments include techniques using both hardware and software, and therefore, various embodiments may not exclude software aspects.

[0037] In the following, the present disclosure relates to an apparatus and method for configuring resource areas, allocating specific resources, or selecting resources in a configured resource area in a wireless communication system. Specifically, the present disclosure describes a technique for preventing conflicts between messages in a wireless communication system when sending messages of different vehicle devices.

[0038] For convenience of description, terms and units indicating time resources (e.g., symbol, time slot, subframe, frame, cycle, and interval), terms and units indicating frequency resources (e.g., subcarrier, carrier, bandwidth, cell, frequency band, resource block element, resource block, and resource block group), terms about network entities, terms about elements of devices, etc. used in the following description are shown. Therefore, the present disclosure is not limited to the following terms, and other terms having the same technical meanings may be used.

[0039] In addition, the present disclosure uses terms used in some communication standards or organizations (e.g., the Third Generation Partnership Project (3GPP), the Society of Automotive Engineers (SAE), the Institute of Electrical and Electronics Engineers (IEEE), and the National Highway Traffic Safety Administration (NHTSA)) to describe various embodiments, but this is only an example for description. Various embodiments can also be easily modified and applied to other communication systems.

[0040] Figure 1 A wireless communication system according to an embodiment of the present disclosure is shown. Figure 1 , Figure 1 A first base station 111, a second base station 112, and terminals 121, 123, 125, 127, and 129 are shown as a part of nodes using a wireless channel in a wireless communication system.

[0041] The first base station 111 and the second base station 112 are network infrastructures that provide wireless access to the terminals 121, 123, 125, 127, and 129. The first base station 111 and the second base station 112 have coverage defined as a predetermined geographical area based on the distance over which a signal can be transmitted. In addition to "base station", the first base station 111 and the second base station 112 may also be referred to as "access point (AP)", "eNodeB (eNB)", "5G node (5G node)", "5G NodeB (NB)", "radio point", "transmission / reception point (TRP)", "distribution unit (DU)", "radio unit (RU)", "remote radio head (RRH)" or other terms with equivalent technical meanings. A cell may indicate an area that may be covered by a single base station. A single base station may cover one cell, and may cover multiple cells. Here, each cell may be divided by the supported frequency and the area of ​​the sector to be covered. In the following description, a base station may be used as a term including a cell, or a cell may be used as a term representing a base station.

[0042] Each of the terminals 121, 123, 125, 127, and 129 is a device used by a user, and performs communication with the first base station 111 and the second base station 112 through a wireless channel. In some cases, at least one of the terminals 121, 123, 125, 127, and 129 may operate without user participation. That is, at least one of the terminals 121, 123, 125, 127, and 129 is a device that performs machine type communication (MTC) and may not be carried by a user. In addition to the "terminal", each of the terminals 121, 123, 125, 127, and 129 may also be referred to as a "user equipment (UE)", "customer premises equipment (CPE)", "mobile station", "user station", "remote terminal", "wireless terminal", "vehicle user equipment", "electronic device", "user device" or other terms with equivalent technical meanings.

[0043] Reference Figure 1, various embodiments in which communication may be performed are shown. For example, communication may be performed between a first base station 111 and a terminal 121. The first base station 111 may send a downlink (DL) signal to the terminal 121, or the terminal 121 may send an uplink (UL) signal to the first base station 111. As another example, communication may be performed using a direct link between any two terminals. That is, communication may be performed using a direct link between two terminals 121 and 123 within the service range of the first base station 111, communication may be performed using a direct link between a terminal 121 within the service range of the first base station 111 and a terminal 125 outside the service range of the first base station 111, and communication may be performed using a direct link between two terminals 125 and 127 outside the service range of the first base station 111. Alternatively, communication may be performed using a direct link between terminals 121 and 129 within the service ranges of different base stations 111 and 112, respectively.

[0044] Terminals 121 and 123 within the service range of the first base station 111 can configure parameters for communication with the first base station 111, and terminal 129 within the service range of the second base station 112 can configure parameters for communication with the second base station 112, while terminals 125 and 127 outside the service range of the first base station 111 can perform operations according to a predetermined configuration. In the present disclosure, terminals 121, 123, 125, 127, and 129 can be used as a transmitter or a receiver when performing mutual communication. The roles of the transmitter and the receiver may not be fixed and may be variable. For example, terminal 121 may be used as a transmitter at one point in time and may be used as a receiver at another point in time. Alternatively, terminal 121 may be used as a transmitter in one frequency band and may be used as a receiver in another frequency band.

[0045] Terminals 121, 123, 125, 127, and 129 may communicate using an intelligent transportation system (ITS) frequency band (e.g., 5.9 GHz). At least one of the terminals 121, 123, 125, 127, and 129 may be implemented inside a vehicle. That is, at least one of the terminals 121, 123, 125, 127, and 129 may support vehicle-to-everything (V2X) communication technology. V2X communication may fundamentally include a vehicle-to-vehicle (V2V) scheme as a communication scheme between vehicles, a vehicle-to-pedestrian (V2P) scheme, and a vehicle-to-infrastructure / network (V2I / N) representing communication between a vehicle and a roadside unit or communication between networks. Hereinafter, the present disclosure is described based on a V2V scheme as a communication scheme between vehicles, but is not limited thereto. When a message such as a safety message (e.g., a basic safety message (BSM)) that is periodically sent and received is required, various embodiments of the present disclosure may be applicable to V2P and V2I / N as well as V2V.

[0046] Figure 2 A block diagram of a base station in a wireless communication system according to an embodiment of the present disclosure is shown. Figure 2 The configuration shown in the figure may be understood as the configuration of the first base station 111 or the second base station 112. The term "unit" or "device" used hereinafter may refer to a unit for processing at least one function or operation, and may be implemented in hardware, software, or a combination of hardware and software.

[0047] Reference Figure 2 The base station 111 or 112 includes a wireless communication unit 210 , a backhaul communication unit 220 , a storage unit 230 , and a control unit 240 .

[0048] The wireless communication unit 210 performs the function of sending or receiving a signal through a wireless channel. For example, the wireless communication unit 210 performs the conversion function between the baseband signal and the bit stream according to the physical layer standard of the system. For example, when sending data, the wireless communication unit 210 generates complex symbols by encoding and modulating the transmission bit stream. In addition, when receiving data, the wireless communication unit 210 recovers the received bit stream by demodulating and decoding the baseband signal.

[0049] In addition, the wireless communication unit 210 up-converts the baseband signal into a wireless radio frequency (RF) band signal, transmits the RF band signal through the antenna, and down-converts the RF band signal received by the antenna into a baseband signal. To this end, the wireless communication unit 210 may include a transmission filter, a reception filter, an amplifier, a mixer, an oscillator, a digital-to-analog converter (DAC), an analog-to-digital converter (ADC), etc. In addition, the wireless communication unit 210 may include multiple transmission / reception paths. In addition, the wireless communication unit 210 may include at least one antenna array including multiple antenna elements.

[0050] In terms of hardware, the wireless communication unit 210 may include a transceiver, a digital unit and / or an analog unit, wherein the analog unit includes multiple subunits according to operating power, operating frequency, etc. The digital unit may be implemented as at least one processor (eg, a digital signal processor (DSP)).

[0051] The wireless communication unit 210 transmits and receives signals as described above. Therefore, the whole or part of the wireless communication unit 210 may be referred to as a "transmitter", "receiver" or "transceiver". Transmission and reception performed through a wireless channel, which will be described in the following description, may be understood to mean the above-mentioned processing performed by the wireless communication unit 210.

[0052] The backhaul communication unit 220 provides an interface for performing communication with other nodes within the network. That is, the backhaul communication unit 220 converts a bit stream sent from the base station to other nodes (e.g., other access nodes, other base stations, higher nodes, or core networks) into a physical signal, and converts a physical signal received from other nodes into a bit stream.

[0053] The storage unit 230 may store data such as basic programs, application programs, configuration information, etc. for the operation of the base station. The storage unit 230 may include a volatile memory, a nonvolatile memory, or a combination of a volatile memory and a nonvolatile memory. The storage unit 230 provides the stored data in response to a request of the control unit 240.

[0054] The control unit 240 controls the overall operation of the base station. For example, the control unit 240 sends and receives signals through the wireless communication unit 210 or the backhaul communication unit 220. In addition, the control unit 240 records data in the storage unit 230 and reads the recorded data. The control unit 240 may perform the functions of the protocol stack required by the communication standard. According to other embodiments, the protocol stack may be included in the wireless communication unit 210. To this end, the control unit 240 may include at least one processor. According to various embodiments of the present disclosure, the control unit 240 may include: a mobility management unit 241, which determines whether the vehicle device is located at the edge of the cell or at the boundary of the cell; and a resource management unit 243, which allocates resources to the vehicle device or configures a resource area to the vehicle device. The mobility management unit 241 and the resource management unit 243 may be instruction sets / codes stored in the storage unit 230 that have at least temporarily resided in the control unit 240, or may be a storage space for storing instructions / codes, or may be a part of the circuit constituting the control unit 240. According to various embodiments, the control unit 240 may control the operating device to perform the operations described below.

[0055] According to various embodiments of the present disclosure, a device of a base station in a wireless communication system may include: at least one transceiver and at least one processor operably coupled to the at least one transceiver, wherein the at least one processor is configured to: obtain a channel quality of a first vehicle device; determine a resource allocation area of ​​the first vehicle device based on the channel quality; and send allocation information related to transmission resources determined in the resource allocation area to the first vehicle device, wherein the transmission resources are used by the first vehicle device to send messages to a second vehicle device.

[0056] According to various embodiments, in order to determine a resource allocation area, at least one processor can be configured to: determine whether the first vehicle device meets a specific condition based on channel quality; and when the specific condition is not met, determine a common resource area as the resource allocation area; when the specific condition is met, determine a specific resource area as the resource allocation area, wherein the common resource area includes resources available to the base station and at least one other base station different from the base station, and the specific resource area is resources dedicated to the base station.

[0057] According to various embodiments, in order to determine a specific resource area as a resource allocation area, at least one processor can be configured to: obtain identification information of a base station; and determine a specific resource area among all available resource areas based on the identification information, wherein all available resource areas include a common resource area.

[0058] According to various embodiments, a specific resource region may be identified among a plurality of resource regions, the plurality of resource regions may correspond to different base stations, respectively, and the plurality of resource regions may be regions that do not overlap with each other on a time-frequency resource grid.

[0059] According to various embodiments, in order to determine whether a first vehicle device satisfies a specific condition, at least one processor may be configured to: obtain a first channel quality of the first vehicle device for a service cell of a base station; and when the first channel quality exceeds a threshold, determine that the specific condition is not met; and when the first channel quality is equal to or lower than a threshold, determine that the specific condition is met.

[0060] According to various embodiments, in order to determine whether a first vehicle device satisfies a specific condition, at least one processor may be configured to: obtain a first channel quality of the first vehicle device for a service cell of a base station; obtain a second channel quality of the first vehicle device for a service cell of another base station; and when a value obtained by subtracting the first channel quality from the second channel quality is equal to or less than a threshold, determine that the specific condition is not met; and when the difference between the first channel quality and the second channel quality exceeds a threshold, determine that the specific condition is met.

[0061] According to various embodiments, in order to obtain channel quality, at least one processor can be configured to: receive a measurement report from a first vehicle device, wherein the measurement report includes at least one of a received signal strength of a reference signal sent from a base station or a received signal strength of a reference signal sent from another base station.

[0062] According to various embodiments, at least one processor may also be configured to: send a configuration message to a vehicle device including information related to the determined resource area, the transmission resources may be resources allocated to the ProSe siPC5 communication interface, the allocation information may be included in sidelink control information (SCI) to be sent, the SCI may be included in downlink control information (DCI) to be sent, and the message may be sent via radio resource control (RRC) signaling.

[0063] Figure 3 A block diagram of a vehicle device in a wireless communication system according to an embodiment of the present disclosure is shown. Figure 3 The vehicle device may be understood as an element among the terminals 121, 123, 125, 127, and 129. The term "unit" or "device" used hereinafter may refer to a unit for processing at least one function or operation, and may be implemented in hardware, software, or a combination of hardware and software.

[0064] Reference Figure 3, the terminals 121 , 123 , 125 , 127 , and 129 may include a communication unit 310 , a storage unit 320 , and a control unit 330 .

[0065] In terms of hardware, the communication unit 310 may include a transceiver, a digital unit and / or an analog unit, wherein the analog unit includes a plurality of sub-units according to operating power, operating frequency, etc. The digital unit may be implemented as at least one processor (e.g., a digital signal processor (DSP)).

[0066] The communication unit 310 performs a function for sending or receiving a signal through a wireless channel. For example, the communication unit 310 performs a conversion function between a baseband signal and a bit stream according to the physical layer standard of the system. For example, when sending data, the communication unit 310 generates a complex symbol by encoding and modulating the transmission bit stream. In addition, when receiving data, the communication unit 310 recovers the received bit stream by demodulating and decoding the baseband signal. In addition, the communication unit 310 up-converts the baseband signal to an RF band signal, sends the RF band signal through an antenna, and down-converts the RF band signal received by the antenna to a baseband signal. For example, the communication unit 310 may include a transmission filter, a reception filter, an amplifier, a mixer, an oscillator, a DAC, and an ADC, etc.

[0067] In addition, the communication unit 310 may include multiple transmit / receive paths. In addition, the communication unit 310 may include at least one antenna array including multiple antenna elements. In terms of hardware, the communication unit 310 may include digital circuits and analog circuits (e.g., radio frequency integrated circuits (RFIC)). The digital circuits and analog circuits may be implemented in a single package. The communication unit 310 may include multiple RF chains. In addition, the communication unit 310 may perform beamforming.

[0068] In addition, the communication unit 310 may include multiple communication modules for supporting a variety of different wireless access technologies. For example, different wireless access technologies may include Bluetooth Low Energy (BLE), Wireless Fidelity (Wi-Fi), Wi-Fi Gigabyte (WiGig), cellular networks (e.g., Long Term Evolution (LTE)), New Air Interface (NR), etc. Different frequency bands may include ultra-high frequency (SHF) (e.g., 3.5 GHz, 5 GHz) bands, ITS bands (e.g., 5.9 GHz) and millimeter wave (e.g., 60 GHz) bands.

[0069] The communication unit 310 transmits and receives signals as described above. Therefore, the whole or part of the communication unit 310 may be referred to as a "transmitter", "receiver" or "transceiver". In addition, the transmission and reception performed through the wireless channel to be described in the following description may be understood to represent the above-mentioned processing performed by the communication unit 310.

[0070] The storage unit 320 may store data such as basic programs, applications, configuration information, etc. for the operation of the UE. The storage unit 320 may include a volatile memory, a nonvolatile memory, or a combination of a volatile memory and a nonvolatile memory. The storage unit 320 provides the stored data in response to a request from the control unit 330.

[0071] The control unit 330 controls the overall operation of the UE. For example, the control unit 330 sends and receives signals through the communication unit 310. In addition, the control unit 330 records data in the storage unit 320 and reads the recorded data. The control unit 330 can perform the functions of the protocol stack required by the communication standard. To this end, the control unit 330 may include at least one processor or microprocessor, or may be part of a processor. In addition, the control unit 330 and the communication unit 310 may be referred to as a communication processor (CP). According to various embodiments, the control unit 330 may include at least one telematics control unit (TCU) and / or at least one electronic control unit (ECU). The TCU is an electronic control module for connection of transmission lines, timing maintenance of signals, error control, etc., and the TCU may be configured to control the vehicle device to send or receive radio signals. The ECU may be configured to control a device that performs various functions in a vehicle device.

[0072] According to various embodiments of the present disclosure, the control unit 330 may include: an energy sensing unit 331 that determines whether a specific resource (e.g., a subchannel) is being used by a neighboring node; and a resource determination unit 333 that identifies a resource allocated from a base station or selects a resource within a resource region configured by the base station. The energy sensing unit 331 and the resource determination unit 333 may be an instruction set / code stored in the storage unit 320 that has at least temporarily resided in the control unit 330, or may be a storage space that stores the instruction / code, or may be a part of a circuit constituting the control unit 330. According to various embodiments, the control unit 330 may control the operating device to perform the operations described below.

[0073] According to various embodiments of the present disclosure, a vehicle device in a wireless communication system may include: at least one transceiver and at least one processor operably coupled to the at least one transceiver. The at least one processor is configured to: perform energy sensing; receive resource allocation information related to transmission resources; determine whether the transmission resources are being used by another node based on energy sensing; and when the transmission resources are being used by the other node, send a message to the other vehicle device on an available channel acquired through energy sensing; when the transmission resources are not being used by the other node, send a message to the other vehicle device on the transmission resources.

[0074] According to various embodiments, to perform energy sensing, the at least one processor may be further configured to: perform energy sensing when a channel quality of a serving cell of the vehicle device exceeds a threshold, wherein the channel quality includes reference signal received power (RSRP).

[0075] Figure 4 An example of message transmission by a vehicle device located at a cell edge in a wireless communication system according to an embodiment of the present disclosure is shown. Figure 4 The different base stations show Figure 1 The vehicle device shows a first base station 111 or a second base station 112. Figure 1 Terminals 121, 123, 125, 127 and 129.

[0076] Reference Figure 4 , the first vehicle device 421 may send a message to another vehicle device. The first vehicle device 421 according to various embodiments may send a basic safety message for inter-vehicle communication. The first vehicle device 421 may broadcast a message including at least one of the speed of the first vehicle device 421, the location information of the first vehicle device 421, or the driving information of the first vehicle device 421 to adjacent vehicle devices. Resources need to be allocated in advance to send the message. The transmission resources for inter-vehicle communication may be determined in various ways.

[0077] In various embodiments, the transmission resources may be determined by the base station. For example, the first base station 111 may allocate resources to the first vehicle device 421. For example, in an LTE communication system, a mode 3 in which the eNB intervenes in the selection and management of resources may be defined. For V2V communication (i.e., PC5 interface communication), the eNB may directly schedule the transmission resources of the vehicle device. In various embodiments, the transmission resources may be determined by the vehicle device. The base station may determine the transmission resources by configuring a resource pool for the vehicle device and directly selecting any resource within the resource pool. For example, in an LTE communication system, a mode 4 in which the eNB does not intervene in the selection and management of resources may be defined. The UE of the vehicle may select the resources for V2V communication (i.e., PC5 interface communication) by itself within the resource pool configured by the eNB.

[0078] The first vehicle device 421 can send a message to another vehicle device (e.g., the second vehicle device 423) through the determined transmission resources. When the base station directly determines the resources (e.g., mode 3 of LTE), the vehicle device located in the cell of the base station can send or receive messages without conflict within the limited resources. This is because the base station allocates resources to the vehicle devices in the cell on the available resources respectively, so the resources do not overlap. At the same time, resources are allocated to the vehicle devices in the cell without conflict, but at the boundary of the cell, the situation may be different. For example, the first vehicle device 421 allocated with resources from the first base station 111 and the second vehicle device 423 allocated with resources from the adjacent base station can be allocated the same transmission resources. This is because the scheduler that allocates resources operates independently for each base station. Therefore, even if there is a sudden stop of the vehicle, the V2X communication technology may not be able to recognize the situation. A method of defining an independent resource allocation area for each base station can be considered, but it is not easy to distinguish all base stations (or cells), and the predetermined resource area may not be used effectively. Therefore, a resource management method for preventing the overlap of resource areas allocated between vehicles is needed. Hereinafter, the present disclosure proposes an apparatus and method for stably supporting V2X services in cellular communications.

[0079] In order to provide stable vehicle services, various embodiments of the present disclosure describe a resource allocation method for preventing conflicts when respectively allocating resources of base stations. Messages from a vehicle device located at the edge of a cell are physically adjacent to messages sent from a vehicle device located at the edge of another cell, and therefore, the possibility of conflicts is higher when sent on the same transmission resources. Therefore, the base station needs to perform resource allocation for vehicle devices located at the edge of the cell in a manner different from that for vehicle devices not located at the edge of the cell. The base station can perform resource allocation based on the location of the vehicle device within the cell (hereinafter referred to as location-based resource allocation). In the following, reference will be made to Figure 5 , Figure 6 , Fig. 7A and Figure 7B To describe the location-based resource allocation scheme of the base station.

[0080] Figure 5 A flowchart is shown of an operation of performing location-based resource allocation by a base station in a wireless communication system according to an embodiment of the present disclosure. Figure 5 The base station shows Figure 1 , Figure 2 or Figure 4 The resources allocated by the base station can be used for communication between vehicle devices. Figure 1 and Figure 3 Terminals 121 to 129, or Figure 4The first vehicle device 421 or the second vehicle device 423 .

[0081] Reference Figure 5 In operation 501, the base station may determine a resource region according to a channel quality of the vehicle device. The base station may obtain information related to the channel quality of the vehicle device. The information related to the channel quality of the vehicle device may include at least one of the following: a channel quality of a cell of a serving base station measured by the vehicle device, a channel quality of a cell of a neighboring base station measured by the vehicle device, or a channel quality measured by the base station based on a signal sent by the vehicle device.

[0082] The base station may identify the location of the vehicle device within the cell based on the channel quality of the vehicle device. The base station may determine whether the vehicle device is located at the cell edge based on the channel quality of the vehicle device. The criteria for the cell edge may be defined based on whether a cell edge condition configured by the base station is met. The base station may determine whether the cell edge condition is met based on at least one of the following: a comparison between a threshold and the channel quality of the serving cell, a comparison between the channel quality of the serving cell and the channel quality of the neighboring cell, and a change in the channel quality.

[0083] According to various embodiments, the base station may allocate resources based on the location of the vehicle device within the cell. When the vehicle device meets the cell edge condition, the base station may confirm that the vehicle device is located at the cell edge. When sending messages between vehicle devices connected to different base stations, specific resource areas may be defined to prevent conflicts. Such specific resource areas generally represent all resource areas that can be allocated to the vehicle device by any base station for V2V communication (e.g., PC5 interface communication), or a subset of all resource areas, and such specific resource areas may be a concept different from the resource pool common to the base station. A specific resource area may be a resource area distinguished from the resource area of ​​an adjacent base station, and may be referred to as a base station specific resource area, an eNB specific resource area, a cell specific resource area, and the like. The base station may determine a specific resource area as a resource area for V2V communication. When the vehicle device does not meet the cell edge condition, the base station may determine a common resource area. A common resource area is a concept relative to a specific resource area, and may represent a resource area that is not dedicated to a specific base station. A common resource area may include a portion of or all available areas of a resource area configured to be shared between base stations among all available resource areas. The base station may determine the common resource region as the resource region for PC5 interface communication.

[0084] Although not in Figure 5As shown in the figure, the base station may send information related to the determined resource area to the vehicle device. For example, the determined resource area may be referred to as a resource pool. The base station may send information related to the resource pool as a common resource area or information related to the resource pool as a specific resource area to the vehicle device. According to various embodiments, the base station may dynamically indicate the transmission resources selected by the terminal later by configuring the resource pool in the vehicle device. According to an embodiment, the information related to the resource area may be sent by high-layer signaling (e.g., radio resource control (RRC) signaling). According to various embodiments, the implementation of the embodiment of the present disclosure may be determined by configuring the same resource pool in the vehicle device at the edge of the cell. According to various embodiments, the implementation of the embodiment of the present disclosure may be determined by further confirming that there is a difference between the resource pool allocated to the vehicle at the edge of the cell and the resource pool allocated to the vehicle at the center of the cell. In addition, the base station according to various embodiments may semi-permanently configure the resource area of ​​the vehicle device.

[0085] In operation 503, the base station may allocate resources in the resource area. The base station may allocate resources to the vehicle device in the resource area determined in operation 501, and the resource area is a common resource area or a specific resource area. The base station may select resources to be allocated in the resource area. According to another embodiment, the base station may determine any resource among the resources located in the resource area. According to another embodiment, the base station may determine the resources to be allocated to the vehicle device from the resources located in the resource area according to a predetermined scheduling rule. Although not in Figure 5 , but the vehicle device may request the transmission resources to be allocated from the base station in advance. For example, the vehicle device may send a buffer status report (BSR) to the base station to request the transmission resources for PC5 interface communication from the base station. The base station may determine and allocate the transmission resources based on the request of the vehicle device.

[0086] In operation 505, the base station may transmit resource allocation information to the vehicle device. The base station may transmit resource allocation information to the vehicle device via a downlink. The base station may send downlink control information (DCI) including resource allocation information to the vehicle device. For example, in an LTE communication system, the base station may send downlink control information to the vehicle device by using DCI format 5A. The downlink control information may include sidelink control information for communication between the vehicle device and another device. The sidelink control information represents information related to the scheduling allocation (SA) of the sidelink data, which is sent on a control channel (e.g., PSCCH) for the sidelink data.

[0087] The resource allocation information may include transmission resources for a message from a vehicle device to another vehicle device. For example, in an LTE communication system, a base station may configure resource allocation information by using SCI format 1. Figure 5 , but the vehicle device can obtain resource allocation information from the downlink control information received from the base station. The base station can dynamically allocate resources for sidelink data to the vehicle device based on the downlink control information. In addition, according to an embodiment, the vehicle device can send a message to another vehicle device by using transmission resources periodically configured at predetermined intervals according to the configuration of the base station. The base station can semi-persistently select and allocate periodic transmission resources and resource regions.

[0088] As described above, each base station allocates resources selected on a specific resource area to a terminal located at the edge of the cell so that the transmission resources of the vehicle device may not overlap with the transmission resources of the vehicle device of the adjacent base station. This is because the specific resource area of ​​the serving base station and the specific resource area of ​​the adjacent base station are different from each other. According to another embodiment, the specific resource area of ​​the base station can be configured not to overlap with the specific resource area of ​​at least one base station adjacent to the base station.

[0089] Figure 6 A flowchart showing an operation of determining a resource region by a base station in a wireless communication system according to an embodiment of the present disclosure is shown. Figure 6 The base station shows Figure 1 , Figure 2 or Figure 4 the first base station 111 or the second base station 112. Figure 6 yes Figure 5 part of operation 501, and Figure 6 The operation flow may be understood as the operation of a base station or elements of a base station.

[0090] Reference Figure 6, in operation 601, the base station may obtain channel quality information. The base station may obtain channel quality information of the vehicle device connected to the base station. The channel quality of the present disclosure may be at least one of the following: beam reference signal received power (BRSRP), reference signal received power (RSRP), reference signal received quality (RSRQ), received signal strength indicator (RSSI), signal to interference noise ratio (SINR), carrier to interference noise ratio (CINR), signal to noise ratio (SNR), error vector magnitude (EVM), bit error rate (BER) and block error rate (BLER). In addition to the above examples, other terms with equivalent technical meanings or other metrics indicating channel quality may also be used. In the present disclosure, high channel quality means a situation where the channel quality value related to the signal size is large or the channel quality value related to the error rate is small. Higher channel quality may mean that a smooth wireless communication environment is guaranteed. According to various embodiments, as the channel quality for the serving base station (or serving cell) is higher, the base station may determine that the vehicle device is further located at the center of the cell. On the contrary, as the channel quality for the serving base station is lower, the base station may determine that the vehicle device is further located at the edge of the cell.

[0091] According to various embodiments, the base station may acquire channel quality information of the vehicle device. The base station may acquire channel quality information measured by the vehicle device. In some embodiments, the channel quality information measured by the vehicle device may be channel quality information for a serving base station (or serving cell). The base station may send a downlink signal to the vehicle device. The base station may send a synchronization signal or a reference signal for measuring a channel state to the vehicle device. For example, the synchronization signal may be at least one of a primary synchronization signal (PSS), a secondary synchronization signal (SSS), an extended synchronization signal (ESS), and a software block (or SS / PBCH block). For example, the reference signal may be at least one of a beam reference signal (BRS), a beam refinement reference signal (BRRS), a cell-specific reference signal (CRS), a channel state information reference signal (CSI-RS), and a demodulation reference signal (DM-RS). The vehicle device may send channel state information (CSI) based on a signal sent from the base station. According to various embodiments, information related to channel quality may include information related to the strength of the received signal (RSRP). In some embodiments, the channel quality information measured by the vehicle device may be channel quality information for a neighboring base station (or neighboring serving cell). The vehicle device can measure the downlink signal (eg, CRS) transmitted from the neighboring base station, and can send a measurement report including the result of measuring the downlink signal to the serving base station. The base station can obtain information related to the channel quality based on the measurement report received from the vehicle device.

[0092] According to various embodiments, the base station may directly acquire the channel quality information of the vehicle device. The base station may acquire the channel quality information of the vehicle device by measuring a signal sent from the vehicle device (e.g., a sounding reference signal (SRS) as an uplink signal). For example, the base station may acquire the channel quality information of the vehicle device by measuring the reception strength of the uplink signal sent from the vehicle device.

[0093] In operation 603, the base station may determine whether a cell edge condition is satisfied. The base station may determine whether the vehicle device satisfies the cell edge condition based on the channel quality information of the vehicle device. Here, the cell edge condition is a condition for determining whether the vehicle device is located at a cell edge, and according to various embodiments, the cell edge condition may be defined as one condition, or the cell edge condition may be defined using a sufficient condition that satisfies a plurality of conditions.

[0094] According to various embodiments, the base station may determine whether the cell edge condition is met based on whether the channel quality value of the serving base station of the vehicle device exceeds a threshold. For example, when the RSRP value measured by the vehicle device is equal to or less than a preconfigured threshold, the base station may determine that the cell edge condition is met. This is because a relatively low received power may indicate that the corresponding device is located relatively close to the cell boundary. For example, when the RSRP value of a signal sent from a vehicle device exceeds a specific threshold, the base station may determine that the cell edge condition is not met. This is because a relatively high received power indicates that the corresponding device is close to the base station.

[0095] According to various embodiments, the base station may determine whether the cell edge condition is met based on the channel quality of the serving base station of the vehicle device and the channel quality of the neighboring base station. For example, the base station may determine whether the cell edge condition is met based on whether the difference between the channel quality of the neighboring base station and the channel quality of the serving base station exceeds a threshold. For example, if the RSRP of the neighboring cell is x dB higher than the RSRP of the serving cell (e.g., x<3), the base station may determine that the cell edge condition is met.

[0096] According to various embodiments, the base station may determine whether the cell edge condition is met based on a measurement report triggering event. The measurement report triggering event may represent a condition for sending a measurement report that notifies the base station that a vehicle device (ie, a terminal) needs to be handed over.

[0097] According to various embodiments, the base station may configure a threshold value related to a cell edge condition. In some embodiments, the base station may configure a threshold value related to a cell edge condition based on statistical information. For example, when performing a handover, the base station may configure a threshold value related to a cell edge condition based on statistical information of an RSRP value for a serving cell. In some other embodiments, the base station may configure a threshold value based on an offset value configured for a measurement report. A handover may be performed in a boundary area between a target cell and a serving cell so that a vehicle device may be located at a cell edge immediately before or at the time of the handover. The measurement report is a request by the terminal to the base station to determine the handover, so the base station may configure a threshold value based on the triggering condition of the measurement report.

[0098] Although not located at the edge of the cell, the communication path may not be ensured due to obstacles (e.g., buildings), or the channel quality may be reduced due to environmental interference. In order to compensate for this, the base station can define the cell edge condition using sufficient conditions that satisfy all multiple conditions. According to various embodiments, the base station can obtain channel quality information of each of the multiple neighboring base stations of the vehicle device. The base station can determine whether the cell edge conditions are met respectively by comparing the serving base station with each neighboring base station, and when the conditions related to all multiple neighboring base stations are met, the base station can determine that the vehicle device is located at the edge of the cell. According to various embodiments, in addition to the channel quality information, the base station can also determine whether the cell edge condition is met by using additional information. The base station can determine whether the vehicle device meets the cell edge condition based on the driving information of the vehicle device and the location information of the vehicle device (e.g., Global Navigation Satellite System (GNSS)).

[0099] At operation 605, the base station may determine a common resource region. The common resource region may be a resource region that may be used by any other base station as well as the serving base station. In other words, the common resource region may be a region that includes resources shared by at least two or more base stations, rather than a region that includes resources exclusively allocated to a specific base station. The common resource region may include any available resources that may be allocated for V2V communication on a resource grid defined by time and frequency.

[0100] At operation 607, the base station may determine a specific resource region. At operation 607, the base station may determine a unique specific resource region for it. According to various embodiments, the base station may identify a resource region corresponding to the base station from a plurality of predefined regions. The base station may identify a resource region corresponding to the base station from a plurality of regions based on preconfigured information. According to various embodiments, the base station may determine a specific resource region based on identification information of the base station. The identification information may be used as information for specifying a base station and used to define a region specific to the base station from all available resources.

[0101] According to various embodiments, the base station may determine a specific resource area. The base station may determine a specific resource area on a resource grid including a time domain and a frequency domain. According to various embodiments, the specific resources of the base station may be specified by a time resource unit (e.g., a frame, a subframe, a time slot, and a symbol), a frequency resource unit (e.g., a bandwidth, a bandwidth part, a resource block (RB), a resource element (RE), and a subcarrier (SC)), or a resource pattern.

[0102] As in Figure 5 As described in operations 503 and 505 of the present invention, the base station may select a resource in the determined resource area (the common resource area or the specific resource area), and may send downlink control information including side link control information related to the selected resource to the vehicle device. Fig. 7A and Figure 7B To describe the specific method of determining resource areas.

[0103] Fig. 7A A flowchart showing an operation of determining a specific resource region by a base station in a wireless communication system according to an embodiment of the present disclosure is shown. Fig. 7A The base station shows Figure 1 , Figure 2 or Figure 4 the first base station 111 or the second base station 112. Fig. 7A yes Figure 6 as part of operation 607, and Fig. 7A The operation flow may be understood as the operation of a base station or elements of a base station.

[0104] Reference Fig. 7A In operation 701, the base station may obtain configuration information. According to various embodiments, the configuration information indicates information pre-configured to the base station, and may indicate information configured by manual input of a network operator. The configuration information may include parameters according to a service operator policy. The configuration information may include a pre-configured value indicating a resource region. For example, the pre-configured value may indicate a symbol of a specific number within a subframe. For example, the pre-configured value may indicate a specific carrier among a plurality of carriers. For example, the pre-configured value may be an index indicating a specific resource region among a plurality of resource regions.

[0105] In operation 703, the base station may identify a specific resource area from among a plurality of resource areas. The base station may identify a specific resource area from among predefined resource areas based on configuration information. According to various embodiments, a plurality of resource areas may be defined among all areas of transmission resources that may be allocated to V2X communication. The plurality of resource areas may include a plurality of specific resource areas. According to various embodiments, a plurality of specific resource areas may be configured. The base station may identify a specific resource area configured to the base station based on the configuration information among the plurality of specific resource areas. The plurality of specific resource areas may not overlap with each other. For example, a plurality of specific resource areas may be distinguished in a time division multiplexing manner. For example, a plurality of specific resource areas may be distinguished in a frequency division multiplexing manner.

[0106] In some embodiments, the value preconfigured by the service operator may represent one of the eight carriers. All available resource areas for V2X communication may be divided into eight carriers. The base station may identify the area indicated by the preconfigured value corresponding to one of the eight carriers as a resource area specific to the base station. For example, the preconfigured value may include three bits. In some embodiments, the value preconfigured by the service operator may represent one of the nine resource areas. The resources included in the nine resource areas may not overlap with each other. The base station may identify one of the nine resource areas indicated by the preconfigured value as a specific resource area. In some other embodiments, the value preconfigured by the service operator may indicate at least one symbol. The at least one symbol may be indicated within 14 symbols of a TTI as a scheduling unit. The base station may identify the resource area indicated by the preconfigured value corresponding to the symbol interval as a resource area specific to the base station.

[0107] Figure 7B A flowchart showing an operation of determining a specific resource region by a base station in a wireless communication system according to an embodiment of the present disclosure is shown. Figure 7B The base station shows Figure 1 , Figure 2 or Figure 4 the first base station 111 or the second base station 112. Figure 7B yes Figure 6 as part of operation 607, and Figure 7B The operation flow may be understood as the operation of a base station or elements of a base station.

[0108] Reference Figure 7B, in operation 731, the base station may acquire its identification information. According to various embodiments, the identification information may include an identifier for distinguishing a base station from another base station. For example, the identification information may include a physical cell identifier (PCI). A serving cell of a base station may be distinguished from a cell of a neighboring base station by having a PCI different from that of a cell of a neighboring base station. For example, the identification information may include an eNB identifier (ID). Because a neighboring cell may have the same value as that of an identifier of the same serving cell, the base station may additionally consider the eNB ID. According to an embodiment, the identification information may include an evolved UMTS terrestrial radio access network (E-UTRAN) cell identifier (ECI) including a PCI and an eNB ID. For example, the identification information may include a service operator ID (e.g., a mobile network code (MNC) ID, a public land mobile network (PLMN) ID). According to an embodiment, the identification information may include an ECGI.

[0109] In operation 733, the base station may determine a specific resource region on the available resource region. According to various embodiments, the available resource region may be a specific frequency band defined for V2X communication. For example, the specific frequency band may be an ITS frequency band of 5.9 GHz. The available resource region may include a time domain corresponding to the current schedulable interval and a frequency domain that can be allocated resources by the corresponding base station on the ITS frequency band.

[0110] The base station may determine a specific resource area on the available resource area. In some embodiments, the base station may determine a resource area specific to the base station in a time division multiplexing (TDM) manner. The base station may determine at least one time-frequency unit (e.g., frame, subframe, time slot, and symbol) dedicated to the base station. For example, the base station may specify a time interval corresponding to a first symbol and a second symbol among 14 symbols of a TTI (transmission time interval) based on the identification information of the base station. A neighboring base station may specify a time interval corresponding to a third symbol and a fourth symbol based on the identification information of the neighboring base station.

[0111] In some embodiments, a base station may determine a resource region specific to the base station in a frequency division multiplexing (TDM) manner. The base station may determine at least one frequency resource unit (e.g., bandwidth, bandwidth portion, resource block (RB), resource element (RE), and subcarrier (SC)) dedicated to the base station. For example, a base station may identify 50 first resource blocks (RBs) in the system bandwidth of an ITS band based on identification information of the base station. Another base station may identify other 50 second resource blocks based on identification information of other base stations.

[0112] In some embodiments, the base station may determine a resource region specific to the base station in a time division multiplexing manner or a frequency division multiplexing manner. The base station may identify a region specified by at least one time resource unit and at least one frequency resource unit on a resource grid. The at least one time resource unit and the at least one frequency resource unit may be specified by identification information of the base station. For example, the base station may specify a symbol by constituting a first part of a cell identifier (e.g., a cell group ID), and may specify a resource block by constituting a second part of a cell identifier (an ID in a cell group).

[0113] In some embodiments, a base station may determine a resource region specific to the base station in a specified pattern. On a resource grid, resources of a pattern designated to a base station may be orthogonal to resources of a pattern designated to another base station. The location of resources according to a specified pattern may be obtained based on the identified information. For example, a base station may identify a starting resource element (e.g., (k, l), where k is a subcarrier number and l is a symbol number) defined on a resource grid obtained based on an eNBID value of the base station. The base station may determine resource elements within a predetermined range from the starting resource element as a specific resource region.

[0114] Reference Fig. 7A and Figure 7B An example of identifying or determining a specific resource area based on configuration information and identification information is described, but the present disclosure is not limited thereto. The base station can identify a specific resource area based not only on the above information, but also on at least one of the location information, driving information, or channel quality of the vehicle device. According to various embodiments, the base station can determine a specific resource area based on a size determined according to the channel quality. For example, the base station can determine a specific resource area that makes the size of the specific resource area smaller when the channel quality is low. The base station can determine a specific resource area that makes the size of the specific resource area larger when the channel quality is high. By configuring the size of the specific resource area inversely proportional to the size of the channel quality, coexistence between adjacent base stations on the entire resource grid can be met. According to various embodiments of the present disclosure, the possibility of a conflict when sending a message between two vehicle devices can be reduced by configuring the resource area of ​​the transmission resources used for V2X communication to be different from the resource area of ​​the adjacent base station.

[0115] Figure 8 An example of location-based resource allocation in a wireless communication system according to an embodiment of the present disclosure is shown. According to various embodiments, a base station may differently configure a resource region as a set of allocatable resources based on the location of a vehicle. Figure 8 The base station shows Figure 1 , Figure 2 or Figure 4 The vehicle device shows a first base station 111 or a second base station 112. Figure 1and Figure 3 Terminals 121 to 129, or Figure 4 The first vehicle device 421 or the second vehicle device 423 .

[0116] Reference Figure 8 , the first base station may determine a resource area for the first vehicle device. The second base station may determine a resource area for the second vehicle device. The first vehicle device may be located at the cell center of the first base station. The first base station may determine a resource area on the resource grid 800. The resource area may be used not only for the first base station, but also for the first base station and another base station. The resource area may be a group of resources that are not dedicated to a specific base station. The first base station may determine a common resource area on the resource grid 800. According to an embodiment, the first base station may configure a common resource area. The first base station may send information indicating the configured common resource area to the first vehicle device. Similarly, the second vehicle device may be located at the cell center of the second base station. The second base station may determine a resource area on the resource grid 800. The resource area may be used not only for the second base station, but also for the second base station and another base station. The second base station may determine a common resource area on the resource grid 800. According to an embodiment, the second base station may configure a second common resource area. Each of the first base station and the second base station may perform scheduling independently. Because the first vehicle device is located at the cell center of the first base station and the second vehicle device is located at the cell center of the second base station, no conflict occurs even if the same transmission resources are allocated to the first vehicle device and the second vehicle device. Even if the first vehicle device and the second vehicle device send messages at the same time, no conflict occurs due to the difference in physical distance between the two messages.

[0117] The first vehicle device may also be located outside the cell of the first base station. The first base station may determine a first specific resource area 851 on the resource grid 850. The first base station may determine a first specific resource area 851 that does not overlap with a second specific resource area 852 on the same resource grid. According to an embodiment, the first base station may configure the first specific resource area 851. The second vehicle device may be located outside the cell of the second base station. The second base station may configure a second specific resource area 852 on the resource grid 850. The second base station may determine a second specific resource area 852 that does not overlap with the first specific resource area 851 on the same resource grid. According to an embodiment, the second base station may configure a second specific resource area. When scheduling a terminal (vehicle device) located at the edge of the cell, the first base station or the second base station may prevent resource allocation from being located at the same location by configuring resource areas differently for each base station. Each of the first base station and the second base station may perform scheduling independently. Even if each of the first base station and the second base station performs scheduling independently, different transmission resources may be allocated to the first vehicle device and the second vehicle device, respectively, by configuring the area available for resource allocation in a base station-specific manner.

[0118] According to various embodiments of the present disclosure, an operating method of a base station in a wireless communication system may include: obtaining a channel quality of a first vehicle device; determining a resource allocation area of ​​the first vehicle device based on the channel quality; and sending allocation information related to a transmission resource determined in the resource allocation area to the first vehicle device, wherein the transmission resource is used by the first vehicle device to send a message to a second vehicle device.

[0119] According to various embodiments, determining the resource allocation area may include: determining whether the first vehicle device meets a specific condition based on channel quality; and when the specific condition is not met, determining a common resource area as the resource allocation area; when the specific condition is met, determining a specific resource area as the resource allocation area, wherein the common resource area includes resources available to the base station and at least one other base station different from the base station, and the specific resource area is resources dedicated to the base station.

[0120] According to various embodiments, determining a specific resource region as a resource allocation region may include: acquiring identification information of a base station; and determining a specific resource region among all available resource regions based on the identification information, wherein all available resource regions include a common resource region.

[0121] According to various embodiments, a specific resource region may be identified among a plurality of resource regions, the plurality of resource regions may correspond to different base stations, respectively, and the plurality of resource regions may be regions that do not overlap with each other on a time-frequency resource grid.

[0122] According to various embodiments, determining whether the first vehicle device satisfies a specific condition may include: obtaining a first channel quality of a service cell of a base station of the first vehicle device; and when the first channel quality exceeds a threshold, determining that the specific condition is not satisfied; and when the first channel quality is equal to or lower than a threshold, determining that the specific condition is satisfied.

[0123] According to various embodiments, determining whether a first vehicle device satisfies a specific condition may include: obtaining a first channel quality of a service cell of a base station of the first vehicle device; obtaining a second channel quality of a cell of another base station of the first vehicle device; and when a value obtained by subtracting the first channel quality from the second channel quality is equal to or less than a threshold, determining that the specific condition is not satisfied; and when a difference between the first channel quality and the second channel quality exceeds a threshold, determining that the specific condition is satisfied.

[0124] According to various embodiments, acquiring the channel quality may include: receiving a measurement report from the first vehicle device, wherein the measurement report includes at least one of a received signal strength of a reference signal sent from a base station or a received signal strength of a reference signal sent from another base station.

[0125] According to various embodiments, the operating method may also include: sending a configuration message including information related to the determined resource area to the vehicle device, the transmission resource may be a resource allocated to the PC5 communication interface, the allocation information may be included in the sidelink control information (SCI) to be sent, the SCI may be included in the downlink control information (DCI) to be sent, and the message may be sent via radio resource control (RRC) signaling.

[0126] When a specific resource area unique to a base station is configured and resources are selected by the base station, the base station can reduce the possibility of collision between transmission messages of vehicle devices. Various embodiments of the present disclosure provide a method for further reducing the possibility of collision based on energy sensed by a terminal in addition to a resource area configured by a base station. Fig. 9 and Fig.10 An embodiment of sensing-based resource selection is described below.

[0127] Fig. 9 A flowchart is shown of an operation of performing energy sensing-based resource selection by a vehicle device in a wireless communication system according to an embodiment of the present disclosure. Fig. 9 The vehicle device shows Figure 1 and Figure 3 Terminals 121 to 129, or Figure 4 The first vehicle device 421 or the second vehicle device 423 .

[0128] Reference Fig. 9In operation 901, the vehicle device may perform energy sensing. Energy sensing is a process for determining which channel is being used nearby, and the vehicle device may determine whether the corresponding channel is being used by another vehicle device based on whether a signal strength equal to or greater than a threshold is detected in the channel.

[0129] According to various embodiments, when it is determined that the vehicle device is located at the edge of the cell, the vehicle device may initiate energy sensing in operation 901. In order to determine whether the vehicle device is located at the edge of the cell, the vehicle device may measure the channel quality of the reference signal or synchronization signal received from the base station, or may obtain the location information of the vehicle device through the GNSS communication module. For example, the vehicle device may determine whether the vehicle device is located at the cell edge of the serving base station based on whether the average value of the RSRP value of the reference signal received from the serving base station exceeds a threshold. According to various embodiments, the vehicle device may initiate energy sensing without determining the location in the cell based on the channel quality of the vehicle device. This is because, when the vehicle device is located at the center of the cell, the transmission resources received from the base station are already available resources determined by the base station.

[0130] The vehicle device may receive configuration information related to energy sensing from the base station. The configuration information related to energy sensing may include information related to at least one of a sensing window, a sensing periodicity, and a resource selection window. The vehicle device may determine whether a signal with an intensity equal to or greater than a threshold is detected in a resource area by another node (vehicle device or base station) during the sensing window. If a signal with an intensity equal to or greater than a threshold is detected in a specific resource, the vehicle device may determine that the resource is occupied by another node (vehicle device or base station). That is, based on the result of energy sensing, it may be determined that the resource is being used by another node.

[0131] In operation 903, the vehicle device may receive resource allocation information. The resource allocation information may include information indicating resources selected by the base station within a resource region. For example, the resource allocation information may be an SCI included in the DCI. The resource allocation information may be information related to transmission resources used when the vehicle device sends a message to another vehicle device. The vehicle device may identify transmission resources allocated to V2X communication (e.g., V2V communication) by receiving the resource allocation information from the base station.

[0132] In operation 905, the vehicle device may determine whether the allocated transmission resources are in use. The vehicle device may determine whether the available channels acquired via energy sensing in operation 901 include the allocated transmission resources. The vehicle device may determine whether the available channels (i.e., channels not used by another node) include transmission resources. When the available channels include the allocated transmission resources, the vehicle device may determine that the allocated transmission resources are not used by another node. When the available channels do not include the allocated transmission resources, the vehicle device may determine that the allocated transmission resources are being used by another node. When it is determined that the allocated transmission resources are not being used by another node, the vehicle device may perform operation 907. When it is determined that the allocated transmission resources are being used by another node, the vehicle device may perform operation 909.

[0133] In operation 907, the vehicle device may use the allocated resources. The vehicle device may use the allocated transmission resources for message transmission of the vehicle device. The vehicle device may send a message (e.g., BSM) on the transmission resources based on the side link control information obtained based on the downlink control information. That is, the vehicle device may send a message by using the transmission resources selected by the base station. For example, in an LTE communication system, the base station and the vehicle device use a resource allocation scheme such as Mode 3.

[0134] In operation 909, the vehicle device may use resources according to the energy sensing result. The vehicle device may identify the transmission resource based on the energy sensing result. The energy sensing result may include an available channel that is not used by another node. Since the vehicle device detects that the resources allocated from the base station are used by another node (e.g., the vehicle device), the vehicle device may identify the transmission resource among the available channels. The vehicle device may not use the resources allocated from the base station. According to an embodiment, the vehicle device may abandon the resources allocated from the base station. The vehicle device may send a message (e.g., a BSM) by using the identified transmission resources.

[0135] exist Fig. 9 , it is described that operation 903 is performed after operation 901, but the present disclosure is not limited thereto. For example, the vehicle device may perform energy sensing after receiving resource allocation information according to operation 903. The vehicle device may determine whether the allocated transmission resource is being used by performing energy sensing on a subchannel corresponding to the resource allocation information.

[0136] Fig.10 An example of resource selection based on energy sensing in a wireless communication system according to an embodiment of the present disclosure is shown. Energy sensing is a process performed by a vehicle device, and Fig. 9 Operation 901 of the present invention. A vehicle device may sense whether a message of another vehicle device is transmitted.

[0137] Reference Fig.10 , an energy sensing window 1010 may be configured in the vehicle device. For example, the length of the energy sensing window 1010 may be 1000 ms. The vehicle device may sense whether another vehicle device is performing a transmission. The vehicle device may sense the transmission of another vehicle device in each receiving subframe during the energy sensing window 1010.

[0138] The vehicle device may generate energy sensing results for 1000 subframes by performing energy sensing during the energy sensing window 1010. The energy sensing results may include available candidate resources. The vehicle device may determine the candidate resources by excluding resources corresponding to a case where the SCI of another vehicle device is predicted and the average signal strength is equal to or greater than a threshold from resources used for V2X communication (e.g., V2V communication).

[0139] According to various embodiments, the vehicle device may determine whether there is a resource allocated from the base station among the candidate resources. The resource allocated from the base station may represent a V2X transmission resource indicated by the SA included in the DCI. When the V2X transmission resource is included in the candidate resources, the vehicle device may determine that the transmission resource is not occupied by another vehicle device. Therefore, the vehicle device may send a message to another vehicle device by using the transmission resource.

[0140] According to various embodiments, when a V2X transmission resource is not included in the candidate resources, the vehicle device may determine that the transmission resource is being used by another vehicle device. The vehicle device may determine the transmission resource based on the energy sensing result during the energy sensing window 1010. After 1000 subframes, the vehicle device may perform resource selection in subframe 1015. The vehicle device may perform resource selection in the resource selection window 1020. The vehicle device may select an available transmission resource from among the candidate resources. The vehicle device may retain the selected resource during the resource selection window 1020. The vehicle device may select and retain repeated resources from the selected resources according to a configured period. The vehicle device may send a message to another vehicle device by using the selected and reserved resources.

[0141] According to various embodiments of the present disclosure, a method for operating a vehicle device in a wireless communication system may include: performing energy sensing; receiving resource allocation information related to transmission resources; determining whether the transmission resources are being used by another node based on energy sensing; and when the transmission resources are being used by the other node, sending a message to the other vehicle device on an available channel obtained through energy sensing; when the transmission resources are not being used by the other node, sending a message to the other vehicle device on the transmission resources.

[0142] According to various embodiments of the present disclosure, performing energy sensing may include: performing energy sensing when a channel quality of a serving cell of the vehicle device exceeds a threshold, wherein the channel quality includes a reference signal received power (RSRP).

[0143] In the present disclosure, the expression "equal to or greater than" or "equal to or lower than / less than" is used to determine whether a specific condition is satisfied (achieved), but this is merely a description showing an example and does not exclude "exceed" or "lower than / less than." The description of the condition "equal to or greater than" may be replaced with "exceed," the description of the condition "equal to or lower than / less than" may be replaced with "lower than / less than," and the description of the condition "equal to or greater than and lower than / less than" may be replaced with "exceed and equal to or lower than / less than."

[0144] In addition, in the present disclosure, Mode 3 and Mode 4 as V2X modes in LTE are described as examples, but when scheduling is performed in a mode defined according to a resource allocation scheme, the present disclosure can be applied to other communication systems (e.g., NR) in addition to LTE with the same or similar scheme.

[0145] The methods according to the embodiments described in the claims and / or the specification of the present disclosure may be implemented in hardware, software, or a combination of hardware and software.

[0146] 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 may be configured to be executed by one or more processors in an electronic device. At least one program may include instructions that cause an electronic device to perform a method according to various embodiments of the present disclosure as defined by the appended claims and / or disclosed herein.

[0147] The program (software module or software) may be stored in a non-volatile memory including random access memory and flash memory, a read-only memory (ROM), an electrically erasable programmable read-only memory (EEPROM), a magnetic disk storage device, a compact disk-ROM (CD-ROM), a digital versatile disk (DVD) or other types of optical storage devices or tapes. Alternatively, any combination of some or all may form a memory storing the program. In addition, a plurality of such memories may be included in an electronic device.

[0148] 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 (WAN), and a storage area network (SAN), or a combination thereof). Such a storage device can access the device executing the embodiments of the present disclosure via an external port. In addition, a separate storage device on a communication network can access the portable electronic device.

[0149] Furthermore, a plurality of elements expressed in the description may be configured as a single element, or a single element in the description may be configured as a plurality of elements.

[0150] While the present disclosure has been shown and described with reference to various embodiments thereof, it will be understood by those skilled in the art that various changes in form and details may be made without departing from the spirit and scope of the present disclosure as defined by the appended claims and their equivalents.

Claims

1. A method performed by a first vehicle device in a wireless communication system, the method comprising: receiving first information for configuring a resource pool from a base station; receiving second information configuring energy sensing from the base station; identifying whether the first vehicle device is located at an edge of a serving cell based on information about a channel quality between the first vehicle device and the base station; In a case where the first vehicle device is located at an edge of the serving cell, obtaining one or more available sub-channels dedicated to the first vehicle device by performing the energy sensing; receiving downlink control information DCI from the base station, the downlink control information DCI comprising resource allocation information indicating at least one resource allocated in the resource pool; identifying whether the one or more available subchannels include the at least one resource; and sending a message to a second vehicle device on an available subchannel of the one or more available subchannels if the one or more available subchannels do not include the at least one resource; as well as In a case where the one or more available sub-channels include the at least one resource, a message is sent to the second vehicle device on the at least one resource.

2. The method according to claim 1, wherein: Performing the energy sensing includes: In a case where the channel quality of the serving cell of the first vehicle device exceeds a threshold, performing the energy sensing, The channel quality includes reference signal received power RSRP.

3. The method according to claim 1, wherein: The second information includes at least one of a sensing window, a sensing periodicity, or a resource selection window.

4. The method according to claim 1, wherein: Performing the energy sensing includes: sensing a transmission from another vehicle device based on the second information; performing said energy sensing during an energy sensing window; and The one or more available sub-channels are obtained.

5. The method according to claim 4, wherein: Performing the energy sensing during the energy sensing window includes: In case a signal having a strength equal to or greater than a threshold is detected in a sub-channel, the sub-channel is identified as being used by other devices.

6. The method according to claim 1, further comprising: In a case where the one or more available sub-channels do not include the at least one resource, the at least one resource is abandoned.

7. A first vehicle device in a wireless communication system, the first vehicle device comprising: Transceiver; as well as a controller coupled to the transceiver and configured to: receiving first information for configuring a resource pool from a base station; receiving second information configuring energy sensing from the base station; identifying whether the first vehicle device is located at an edge of a serving cell based on information about a channel quality between the first vehicle device and the base station; In a case where the first vehicle device is located at an edge of the serving cell, obtaining one or more available sub-channels dedicated to the first vehicle device by performing the energy sensing; receiving downlink control information DCI from the base station, the downlink control information DCI comprising resource allocation information indicating at least one resource allocated in the resource pool; identifying whether the one or more available subchannels include the at least one resource; and sending a message to a second vehicle device on an available subchannel of the one or more available subchannels if the one or more available subchannels do not include the at least one resource, and In a case where the one or more available sub-channels include the at least one resource, a message is sent to the second vehicle device on the at least one resource.

8. The first vehicle device according to claim 7, wherein: To perform the energy sensing, the controller is configured to: In a case where the channel quality of the serving cell of the first vehicle device exceeds a threshold, performing the energy sensing, The channel quality includes reference signal received power RSRP.

9. The first vehicle device according to claim 7, wherein: The second information includes information of at least one of a sensing window, a sensing periodicity, or a resource selection window.

10. The first vehicle device according to claim 7, wherein: To perform the energy sensing, the controller is configured to: sensing a transmission from another vehicle device based on the second information; performing said energy sensing during an energy sensing window; and The one or more available sub-channels are obtained.

11. The first vehicle device according to claim 10, wherein: To perform the energy sensing during the energy sensing window, the controller is configured to: In the event that a signal having a strength equal to or greater than a threshold is detected in a sub-channel, the sub-channel is identified as being used by other vehicle devices.

12. The first vehicle device according to claim 7, wherein: The controller is also configured to: In a case where the one or more available sub-channels do not include the at least one resource, the at least one resource is abandoned.

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