Method for configuring sidelink resources in communication system and apparatus for the same

Abstract

An operation method of a base station in a communication system is provided. The method includes: generating TDD-uplink-downlink configuration common information including information on a DL-UL transmission period, a DL pattern indicating a DL resource, a UL pattern indicating a UL resource, and an SL pattern indicating an SL resource; and transmitting system information including the TDD-UL-DL-configuration common information to the UE. Therefore, the performance of the communication system is improved.

Description

[0001] This application is a divisional application. The application number of the original application is 201910720727.X, and the invention name is "Method for configuring side link resources in a communication system and device for the method". Technical Field

[0002] The present disclosure relates generally to sidelink communication techniques, and more particularly, to techniques for configuring sidelink resources. Background Art

[0003] In order to process wireless data, various systems have been developed, such as a fourth generation (4G) communication system (e.g., a long term evolution (LTE) communication system or an advanced LTE (LTE-A) communication system) and a fifth generation (5G) communication system (e.g., a new radio (NR) communication system), which uses a higher frequency band than that of the 4G communication system. The 5G communication system supports enhanced mobile broadband (eMBB) communication, ultra-reliable low latency communication (URLLC), massive machine type communication (mMTC), etc.

[0004] 4G communication systems and 5G communication systems support vehicle-to-everything (V2X) communication. V2X communication supported in cellular communication systems (e.g., 4G communication systems, 5G communication systems, etc.) may be referred to as "cellular-V2X (C-V2X) communication". V2X communication (e.g., C-V2X communication) may include vehicle-to-vehicle (V2V) communication, vehicle-to-infrastructure (V2I) communication, vehicle-to-pedestrian (V2P) communication, vehicle-to-network (V2N) communication, etc.

[0005] In a cellular communication system, V2X communication (e.g., C-V2X communication) may be performed based on a "sidelink" communication technology (e.g., based on a proximity service (ProSe) communication technology, a device-to-device (D2D) communication technology, etc.). For example, a sidelink channel of a vehicle participating in V2V communication may be established, and communication between vehicles may be performed using the sidelink channel.

[0006] Sidelink resources may be used to perform sidelink communications. However, a method for configuring sidelink resources has not been clearly defined in 3GPP LTE or NR specifications. Therefore, a method for configuring sidelink resources needs to be defined. Summary of the invention

[0007] Therefore, exemplary embodiments of the present disclosure provide an apparatus and method for configuring side link resources.

[0008] According to an exemplary embodiment of the present disclosure, an operation method of a base station in a communication system may include: generating time division duplex (TDD)-uplink-downlink configuration (TDD-UL-DL-configuration) common information, the TDD-UL-DL-configuration common information including information about a DL-UL transmission period, a DL pattern indicating DL resources, a UL pattern indicating UL resources, and a side link (SL) pattern indicating SL resources; and sending system information including the TDD-UL-DL-configuration common information to a user equipment (UE), wherein DL resources, UL resources, and SL resources are included in the DL-UL transmission period, and resources other than DL resources, UL resources, and SL resources among all resources included in the DL-UL transmission period are flexible resources.

[0009] The SL pattern may include information indicating the number of consecutive SL slots in a DL-UL transmission period, information indicating the number of consecutive SL symbols located before a starting SL slot in consecutive SL slots, information indicating the number of consecutive SL symbols after an ending SL slot in consecutive SL slots, an index of a starting SL slot, and at least one of an index of an ending SL slot. The SL pattern may be used to reconfigure one or more UL resources among the UL resources configured by the UL pattern as SL resources for SL communication.

[0010] The operation method may also include: generating TDD-UL-DL configuration dedicated information, the dedicated information including a slot pattern indicating resources used for SL communication in the flexible resources; and sending a radio resource control (RRC) message including the TDD-UL-DL configuration dedicated information to the UE. The slot pattern may include a slot index, information indicating that all symbols included in the slot indicated by the slot index are SL symbols, information indicating the number of consecutive SL symbols among all symbols included in the slot indicated by the slot index, an index of a starting SL symbol among consecutive SL symbols, and an index of an ending SL symbol among consecutive SL symbols.

[0011] The operating method may also include: generating downlink control information (DCI) including a slot format indicator (SFI) indicating resources used for SL communication in the flexible resources; and sending the DCI to the UE through a physical downlink control channel (PDCCH).

[0012] In addition, according to an exemplary embodiment of the present disclosure, an operation method of a first user equipment (UE) in a communication system may include: receiving system information including time division duplex (TDD)-uplink-downlink configuration (TDD-UL-DL-configuration) common information from a base station; and identifying information about a DL-UL transmission period, a DL pattern indicating DL resources, a UL pattern indicating UL resources, and a side link (SL) pattern indicating SL resources included in the TDD-UL-DL-configuration common information. DL resources, UL resources, and SL resources are included in the DL-UL transmission period, and resources other than DL resources, UL resources, and SL resources among all resources included in the DL-UL transmission period are flexible resources.

[0013] The SL pattern may include information indicating the number of consecutive SL slots in a DL-UL transmission period, information indicating the number of consecutive SL symbols located before a starting SL slot in consecutive SL slots, information indicating the number of consecutive SL symbols after an ending SL slot in consecutive SL slots, an index of a starting SL slot, and at least one of an index of an ending SL slot. The SL pattern may be used to reconfigure one or more UL resources among the UL resources configured by the UL pattern as SL resources for SL communication.

[0014] The operating method may also include: receiving a radio resource control (RRC) message including TDD-UL-DL-configuration dedicated information from a base station; identifying a time slot pattern indicating resources used for SL communication in flexible resources from the TDD-UL-DL-configuration dedicated information; and performing DL communication, UL communication or SL communication using resources configured by the TDD-UL-DL-configuration common information and the TDD-UL-DL-configuration dedicated information.

[0015] The time slot pattern may include a time slot index, information indicating that all symbols included in the time slot indicated by the time slot index are SL symbols, information indicating the number of consecutive SL symbols among all symbols included in the time slot indicated by the time slot index, an index of a starting SL symbol among consecutive SL symbols, and at least one of an index of an ending SL symbol among consecutive SL symbols.

[0016] The step of performing SL communication may also include: sending side link control information (SCI) to the second UE, the SCI including information indicating SL resources configured by TDD-UL-DL-configuration common information and TDD-UL-DL-configuration dedicated information; and using the SL resources indicated by the SCI to perform SL communication with the second UE.

[0017] The operating method may also include: receiving downlink control information (DCI) from a base station; identifying a slot format indicator (SFI) indicating resources used for SL communication in flexible resources from the DCI; and performing DL communication, UL communication or SL communication using resources configured by TDD-UL-DL-configuration common information and the SFI.

[0018] In addition, according to an exemplary embodiment of the present disclosure, a base station in a communication system may include a processor, a transceiver operated by the processor, and a memory configured to store at least one instruction executable by the processor. In addition, when executed by the processor, the at least one instruction may be configured to: generate time division duplex (TDD)-uplink-downlink configuration (TDD-UL-DL-configuration) common information, the TDD-UL-DL-configuration common information including information about a DL-UL transmission period, a DL pattern indicating a DL resource, a UL pattern indicating a UL resource, and a side link (SL) pattern indicating a SL resource; and send system information including the TDD-UL-DL-configuration common information to a user equipment (UE). DL resources, UL resources, and SL resources are included in the DL-UL transmission period, and resources other than DL resources, UL resources, and SL resources among all resources included in the DL-UL transmission period are flexible resources.

[0019] The SL pattern may include information indicating the number of consecutive SL slots in a DL-UL transmission period, information indicating the number of consecutive SL symbols located before a starting SL slot in consecutive SL slots, information indicating the number of consecutive SL symbols after an ending SL slot in consecutive SL slots, an index of a starting SL slot, and at least one of an index of an ending SL slot. The SL pattern may be used to reconfigure one or more UL resources among the UL resources configured by the UL pattern as SL resources for SL communication.

[0020] The at least one instruction may be further configured to: generate TDD-UL-DL-configuration dedicated information, the dedicated information including a slot pattern indicating a resource used for SL communication in the flexible resources; and send a radio resource control (RRC) message including the TDD-UL-DL-configuration dedicated information to the UE. The slot pattern may include a slot index, information indicating that all symbols included in the slot indicated by the slot index are SL symbols, information indicating the number of consecutive SL symbols among all symbols included in the slot indicated by the slot index, an index of a starting SL symbol among consecutive SL symbols, and an index of an ending SL symbol among consecutive SL symbols.

[0021] The at least one instruction may be further configured to: generate downlink control information (DCI) including a slot format indicator (SFI) indicating resources used for SL communication in the flexible resources; and send the DCI to the UE through a physical downlink control channel (PDCCH).

[0022] In addition, according to an exemplary embodiment of the present disclosure, a first user equipment (UE) in a communication system may include a processor, a transceiver operated by the processor, and a memory configured to store at least one instruction executable by the processor. When executed by the processor, the at least one instruction may be configured to: receive system information including time division duplex (TDD)-uplink-downlink configuration (TDD-UL-DL-configuration) public information from a base station; and identify information about a DL-UL transmission period, a DL pattern indicating a DL resource, an UL pattern indicating an UL resource, and a side link (SL) pattern indicating an SL resource included in the TDD-UL-DL-configuration public information.

[0023] DL resources, UL resources, and SL resources are included in a DL-UL transmission period, and resources other than DL resources, UL resources, and SL resources among all resources included in the DL-UL transmission period are flexible resources. The SL pattern may include information indicating the number of consecutive SL slots in the DL-UL transmission period, information indicating the number of consecutive SL symbols before a start SL slot in consecutive SL slots, information indicating the number of consecutive SL symbols after an end SL slot in consecutive SL slots, an index of a start SL slot, and at least one of an index of an end SL slot. The SL pattern may be used to reconfigure one or more UL resources among the UL resources configured by the UL pattern as SL resources for SL communication.

[0024] The at least one instruction may be further configured to: receive a radio resource control (RRC) message including TDD-UL-DL-configuration dedicated information from a base station; identify a time slot pattern indicating resources used for SL communication in flexible resources from the TDD-UL-DL-configuration dedicated information; and perform DL communication, UL communication or SL communication by using resources configured by the TDD-UL-DL-configuration common information and the TDD-UL-DL-configuration dedicated information.

[0025] The time slot pattern may include a time slot index, information indicating that all symbols included in the time slot indicated by the time slot index are SL symbols, information indicating the number of consecutive SL symbols among all symbols included in the time slot indicated by the time slot index, an index of a starting SL symbol among consecutive SL symbols, and at least one of an index of an ending SL symbol among consecutive SL symbols.

[0026] The operating method may also be configured to: receive downlink control information (DCI) from a base station; identify a slot format indicator (SFI) indicating resources used for SL communication in flexible resources from the DCI; and perform DL communication, UL communication or SL communication using resources configured by TDD-UL-DL-configuration common information and the SFI.

[0027] The at least one instruction may be further configured to: send side link control information (SCI) including information indicating SL resources configured by TDD-UL-DL-configuration common information and SFI to the second UE; and perform SL communication with the second UE by using the SL resources indicated by the SCI.

[0028] According to an exemplary embodiment of the present disclosure, a side link (SL) resource can be configured using at least one of time division duplex-uplink-downlink-configuration (TDD-UL-DL-configuration) common information, TDD-UL-DL-configuration dedicated information, and downlink control information (DCI). A user equipment (UE) can be configured to use SL resources to perform side link communication with another UE. Alternatively, the SL resources can be configured by the UE, and the UE can be configured to send side link control information (SCI) including information indicating the SL resources to another UE. The UE can be configured to use the SL resources indicated by the SCI to perform side link communication with another UE. Therefore, side link communication can be performed efficiently, and the performance of the communication system can be improved. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] Exemplary embodiments of the present disclosure will become more apparent by describing in detail exemplary embodiments of the present disclosure with reference to the accompanying drawings, in which:

[0030] Figure 1 A conceptual diagram illustrating a V2X communication scenario according to an exemplary embodiment of the present disclosure;

[0031] Figure 2 A conceptual diagram showing a cellular communication system according to an exemplary embodiment of the present disclosure;

[0032] Figure 3 A conceptual diagram showing a communication node constituting a cellular communication system according to an exemplary embodiment of the present disclosure;

[0033] Figure 4 A block diagram showing a user plane protocol stack for a UE to perform side link communication according to an exemplary embodiment of the present disclosure;

[0034] Figure 5 A block diagram showing a control plane protocol stack for a UE to perform side link communication according to an exemplary embodiment of the present disclosure;

[0035] Figure 6 A block diagram showing a control plane protocol stack for a UE to perform side link communication according to another exemplary embodiment of the present disclosure;

[0036] Figure 7 A conceptual diagram illustrating a DL-UL transmission period including DL resources, UL resources, and SL resources in a communication system according to an exemplary embodiment of the present disclosure;

[0037] Figure 8 A sequence diagram illustrating a resource configuration information signaling method in a communication system according to an exemplary embodiment of the present disclosure;

[0038] Fig. 9 A conceptual diagram illustrating a time slot configured by TDD-UL-DL-configuration-specific information in a communication system according to an exemplary embodiment of the present disclosure;

[0039] Fig.10 A conceptual diagram illustrating a time slot configured by TDD-UL-DL-configuration-specific information in a communication system according to another exemplary embodiment of the present disclosure;

[0040] Fig.11 A conceptual diagram illustrating a DL-UL transmission period including DL resources, UL resources, and SL resources in a communication system according to another exemplary embodiment of the present disclosure;

[0041] Fig.12 A sequence diagram for illustrating a side link communication method in a communication system according to an exemplary embodiment of the present disclosure; and

[0042] Fig.13 A conceptual diagram illustrating time slots configured by SL resource information in a communication system according to an exemplary embodiment of the present disclosure.

[0043] It should be understood that the above drawings are not necessarily drawn to scale, and they present slightly simplified representations of various features illustrating the basic principles of the present disclosure. The specific design features of the present disclosure, including, for example, specific dimensions, orientations, locations, and shapes will be determined in part by the specific intended application and use environment. DETAILED DESCRIPTION

[0044] Exemplary embodiments of the present disclosure are disclosed herein. However, the specific structural and functional details disclosed herein are only for the purpose of describing exemplary embodiments of the present disclosure. Therefore, the exemplary embodiments of the present disclosure can be implemented in many alternative forms and should not be interpreted as being limited to the exemplary embodiments of the present disclosure set forth herein.

[0045] Therefore, although the present disclosure is capable of various modifications and alternative forms, specific exemplary embodiments thereof are shown by way of example in the accompanying drawings and will be described in detail herein. However, it should be understood that it is not intended to limit the present disclosure to the specific forms disclosed, but rather, the present disclosure will cover all modifications, equivalents and alternatives that fall within the spirit and scope of the present disclosure. In the description of the entire drawings, the same reference numerals represent the same elements.

[0046] It should be understood that although the terms first, second, etc. can be used herein to describe various elements, these elements should not be limited by these terms. These terms are only used to distinguish one element from another element. For example, without departing from the scope of the present disclosure, the first element can be referred to as the second element, and similarly, the second element can be referred to as the first element. As used herein, the term "and / or" includes any and all combinations of one or more related listed items.

[0047] It should be understood that when an element is referred to as being "connected" or "coupled" to another element, it can be directly connected or coupled to the other element, or there can be intervening elements. Conversely, when an element is referred to as being "directly connected" or "directly coupled" to another element, there are no intervening elements. Other words used to describe the relationship between elements should be interpreted in a similar manner (i.e., "between" versus "directly between," "adjacent" versus "directly adjacent," etc.).

[0048] The terms used herein are only used for the purpose of describing specific exemplary embodiments and are not intended to limit the present disclosure. As used herein, unless the context clearly indicates otherwise, the singular forms "a", "an" and "the" are intended to also include plural forms. It should be further understood that when used herein, the terms "include", "comprise" and / or "contain" specify the presence of stated features, wholes, steps, operations, elements and / or parts, but do not exclude the presence or addition of one or more other features, wholes, steps, operations, elements, parts and / or combinations thereof.

[0049] Unless otherwise defined, all terms (including technical and scientific terms) used herein have the same meaning as those commonly understood by those skilled in the art to which the present disclosure belongs. It should be further understood that those terms as defined in commonly used dictionaries should be interpreted as having a meaning consistent with their meaning in the context of the relevant art, and should not be interpreted as an idealized or overly formal meaning, unless explicitly defined as such herein.

[0050] It should be understood that the term "vehicle" or "vehicle-like" or other similar terms used herein include general motor vehicles, such as passenger cars including sports utility vehicles (SUVs), buses, trucks, various commercial vehicles, watercraft including various ships, aircraft, etc., and include hybrid vehicles, electric vehicles, plug-in hybrid electric vehicles, hydrogen-powered vehicles and other alternative fuel vehicles (e.g., fuels from resources other than petroleum). As referred to herein, a hybrid vehicle is a vehicle having two or more power sources, such as a gasoline-powered vehicle and an electric vehicle.

[0051] In addition, it should be understood that one or more of the following methods or aspects thereof can be performed by at least one control unit. The term "control unit" or controller can refer to a hardware device including a memory and a processor. The memory is configured to store program instructions, and the processor is specifically programmed to execute program instructions to perform one or more processes further described below. As described herein, the control unit can control the operation of a unit, module, component, etc. In addition, it should be understood that the following method can be performed by a device (e.g., a communication node) including a control unit in combination with one or more other components, as will be understood by those of ordinary skill in the art.

[0052] In addition, the control unit of the present disclosure may be implemented as a non-transitory computer-readable medium containing executable program instructions executed by a processor, a controller, etc. Examples of computer-readable media include, but are not limited to, ROM, RAM, compact disc (CD)-ROM, magnetic tape, floppy disk, flash drive, smart card, and optical data storage device. The computer-readable recording medium may also be distributed throughout a computer network so that the program instructions are stored and executed in a distributed manner, such as through a telematics server or a controller area network (CAN).

[0053] Unless otherwise specified or apparent from the context, as used herein, the term "about" should be understood as being within the normal tolerance range in the art, such as within 2 standard deviations of the mean. "About" can be understood as being within 10%, 9%, 8%, 7%, 6%, 5%, 4%, 3%, 2%, 1%, 0.5%, 0.1%, 0.05%, or 0.01% of the stated value. Unless the context makes it clear otherwise, all numerical values ​​provided herein are modified by the term "about".

[0054] Hereinafter, exemplary embodiments of the present disclosure will be described in more detail with reference to the accompanying drawings. In order to facilitate general understanding when describing the present disclosure, the same components in the drawings are denoted by the same reference numerals, and repeated description thereof will be omitted.

[0055] Figure 1 A conceptual diagram showing a V2X communication scenario. Figure 1As shown, V2X communication may include vehicle-to-vehicle (V2V) communication, vehicle-to-infrastructure (V2I) communication, vehicle-to-pedestrian (V2P) communication, vehicle-to-network (V2N) communication, etc. V2X communication may be supported by a cellular communication system (e.g., cellular communication system 140), and V2X communication supported by the cellular communication system 140 may be referred to as "cellular-V2X (C-V2X) communication". Here, the cellular communication system 140 may include a 4G communication system (e.g., an LTE communication system or an LTE-A communication system), a 5G communication system (e.g., an NR communication system), etc.

[0056] V2V communication may include communication between a first vehicle 100 (e.g., a communication node located within the vehicle 100) and a second vehicle 110 (e.g., a communication node located within the vehicle 110). Various driving information, such as speed, heading, time, location, etc., may be exchanged between the vehicle 100 and the vehicle 110 via V2V communication. For example, autonomous driving (e.g., platooning) may be supported based on the driving information exchanged via V2V communication. V2V communication supported in the cellular communication system 140 may be performed based on a "sidelink" communication technology (e.g., ProSe and D2D communication technology, etc.). In particular, communication between the vehicle 100 and the vehicle 110 may be performed using at least one sidelink channel established between the vehicle 100 and the vehicle 110.

[0057] V2I communication may include communication between the first vehicle 100 (e.g., a communication node located in the vehicle 100) and an infrastructure (e.g., a roadside unit (RSU)) 120 located on the roadside. The infrastructure 120 may also include a traffic light or a street light located on the roadside. For example, when performing V2I communication, communication may be performed between a communication node located in the first vehicle 100 and a communication node located in a traffic light. Traffic information, driving information, and the like may be exchanged between the first vehicle 100 and the infrastructure 120 via V2I communication. The V2I communication supported in the cellular communication system 140 may be performed based on a “side link” communication technology (e.g., ProSe and D2D communication technology, etc.). In particular, communication between the vehicle 100 and the infrastructure 120 may be performed using at least one side link channel established between the vehicle 100 and the infrastructure 120.

[0058] V2P communication may include communication between a first vehicle 100 (e.g., a communication node located in the vehicle 100) and a person 130 (e.g., a communication node carried by the person 130). Driving information of the first vehicle 100 and movement information of the person 130, such as speed, heading, time, location, etc., may be exchanged between the vehicle 100 and the person 130 via V2P communication. The communication node located in the vehicle 100 or the communication node carried by the person 130 may be configured to generate an alarm indicating danger by detecting a dangerous situation based on the obtained driving information and movement information. The V2P communication supported in the cellular communication system 140 may be performed based on a sidelink communication technology (e.g., ProSe and D2D communication technology, etc.). In particular, communication between a communication node located in the vehicle 100 and a communication node carried by the person 130 may be performed using at least one sidelink channel established between the communication nodes.

[0059] V2N communication may be communication between the first vehicle 100 (e.g., a communication node located in the vehicle 100) and a server connected via the cellular communication system 140. V2N communication may be performed based on 4G communication technology (e.g., LTE or LTE-A) or 5G communication technology (e.g., NR). In addition, V2N communication may be performed based on a wireless access in a vehicular environment (WAVE) communication technology or a wireless local area network (WLAN) communication technology defined in the Institute of Electrical and Electronics Engineers (IEEE) 802.11, or a wireless personal area network (WPAN) communication technology defined in IEEE802.15.

[0060] Meanwhile, the cellular communication system 140 supporting V2X communication may be configured as follows.

[0061] Figure 2 FIG. 2 is a conceptual diagram showing an embodiment of a cellular communication system. Figure 2 As shown, the cellular communication system may include an access network, a core network, etc. The access network may include a base station 210, a relay 220, user equipment (UE) 231 to 236, etc. The UE 231 to 236 may include a Figure 1 The communication nodes in the vehicles 100 and 110 are located Figure 1 The communication nodes in the infrastructure 120 are Figure 1 The communication node carried by the person 130, etc. When the cellular communication system supports 4G communication technology, the core network may include a serving gateway (S-GW) 250, a packet data network (PDN) gateway (P-GW) 260, a mobility management entity (MME) 270, etc.

[0062] When the cellular communication system supports 5G communication technology, the core network may include a user plane function (UPF) 250, a session management function (SMF) 260, an access and mobility management function (AMF) 270, etc. Alternatively, when the cellular communication system operates in a non-standalone networking (NSA) mode, the core network composed of the S-GW 250, the P-GW 260, and the MME 270 may support 5G communication technology as well as 4G communication technology, or the core network composed of the UPF 250, the SMF 260, and the AMF 270 may support 4G communication technology as well as 5G communication technology.

[0063] For example, when the cellular communication system supports network slicing technology, the core network can be divided into multiple logical network slices. For example, network slices supporting V2X communication (e.g., V2V network slices, V2I network slices, V2P network slices, V2N network slices, etc.) can be configured, and V2X communication can be supported by V2X network slices configured in the core network.

[0064] The communication nodes (e.g., base stations, relays, UEs, S-GWs, P-GWs, MMEs, UPFs, SMFs, AMFs, etc.) comprising a cellular communication system may be configured to perform communication using at least one of code division multiple access (CDMA) technology, time division multiple access (TDMA) technology, frequency division multiple access (FDMA) technology, orthogonal frequency division multiplexing (OFDM) technology, filtered OFDM technology, orthogonal frequency division multiple access (OFDMA) technology, single carrier FDMA (SC-FDMA) technology, non-orthogonal multiple access (NOMA) technology, generalized frequency division multiplexing (GFDM) technology, filter bank multi-carrier (FBMC) technology, universal filtered multi-carrier (UFMC) technology, and space division multiple access (SDMA) technology.

[0065] The communication nodes comprising a cellular communication system (e.g., base stations, relays, UEs, S-GWs, P-GWs, MMEs, UPFs, SMFs, AMFs, etc.) may be configured as follows.

[0066] Figure 3 FIG. 2 is a conceptual diagram showing an embodiment of a communication node constituting a cellular communication system. Figure 3 As shown, the communication node 300 may include at least one processor 310, a memory 320, and a transceiver 330 connected to a network to perform communication. In addition, the communication node 300 may further include an input interface device 340, an output interface device 350, a storage device 360, etc. Each component included in the communication node 300 may be configured to communicate with each other when connected via a bus 370.

[0067] However, each component included in the communication node 300 may be connected to the processor 310 via a separate interface or a separate bus instead of the common bus 370. For example, the processor 310 may be connected to at least one of the memory 320, the transceiver 330, the input interface device 340, the output interface device 350, and the storage device 360 ​​via a dedicated interface.

[0068] The processor 310 may be configured to execute at least one instruction stored in at least one of the memory 320 and the storage device 360. The processor 310 may refer to a central processing unit (CPU), a graphics processing unit (GPU), or a dedicated processor on which the method according to the exemplary embodiment of the present disclosure is executed. Each of the memory 320 and the storage device 360 ​​may include at least one of a volatile storage medium and a non-volatile storage medium. For example, the memory 320 may include at least one of a read-only memory (ROM) and a random access memory (RAM).

[0069] Reference again Figure 2 In the communication system, the base station 210 may form a macro cell or a small cell and may be connected to the core network via an ideal backhaul or a non-ideal backhaul. The base station 210 may be configured to transmit a signal received from the core network to the UEs 231 to 236 and the relay 220, and transmit a signal received from the UEs 231 to 236 and the relay 220 to the core network. The UEs 231, 232, 234, 235, and 236 may belong to the cell coverage of the base station 210. The UEs 231, 232, 234, 235, and 236 may be connected to the base station 210 by performing a connection establishment procedure with the base station 210. The UEs 231, 232, 234, 235, and 236 may be configured to communicate with the base station 210 after being connected to the base station 210.

[0070] The relay 220 may be connected to the base station 210, and may be configured to relay communication between the base station 210 and the UEs 233 and 234. That is, the relay 220 may be configured to transmit a signal received from the base station 210 to the UEs 233 and 234, and transmit a signal received from the UEs 233 and 234 to the base station 210. The UE 234 may belong to both the cell coverage of the base station 210 and the cell coverage of the relay 220, and the UE 233 may belong to the cell coverage of the relay 220. That is, the UE 233 may be located outside the cell coverage of the base station 210. The UEs 233 and 234 may be connected to the relay 220 by performing a connection establishment procedure with the relay 220. The UEs 233 and 234 may be configured to communicate with the relay 220 after being connected to the relay 220.

[0071] The base station 210 and the relay 220 may support multiple-input multiple-output (MIMO) technology (e.g., single-user (SU)-MIMO, multi-user (MU)-MIMO, massive MIMO, etc.), coordinated multi-point (CoMP) communication technology, carrier aggregation (CA) communication technology, unlicensed band communication technology (e.g., licensed assisted access (LAA), enhanced LAA (eLAA), etc.), side link communication technology (e.g., ProSe communication technology, D2D communication technology), etc. UEs 231, 232, 235, and 236 may be configured to perform operations corresponding to the base station 210 and operations supported by the base station 210. UEs 233 and 234 may be configured to perform operations corresponding to the relay 220 and operations supported by the relay 220.

[0072] In particular, the base station 210 may be referred to as a Node B (NB), an evolved Node B (eNB), a base transceiver station (BTS), a radio remote head (RRH), a transmit receive point (TRP), a radio unit (RU), a road side unit (RSU), a radio transceiver, an access point, an access node, etc. The relay 220 may be referred to as a small base station, a relay node, etc. Each of the UEs 231 to 236 may be referred to as a terminal, an access terminal, a mobile terminal, a station, a subscriber station, a mobile station, a portable subscriber station, a subscriber station, a node, a device, an on-board unit (OBU), etc.

[0073] On the other hand, the communication between UE 235 and 236 may be performed based on the sidelink communication technology. The sidelink communication may be performed based on a one-to-one scheme or a one-to-many scheme. When the V2V communication is performed using the sidelink communication technology, UE 235 may be located at Figure 1 The communication node in the first vehicle 100, UE 236 may be located at Figure 1 When the V2I communication is performed using the sidelink communication technology, the UE 235 may be a communication node located in the second vehicle 110. Figure 1 The communication node in the first vehicle 100, UE 236 may be located at Figure 1 When performing V2P communication using the sidelink communication technology, UE 235 may be a communication node located in Figure 1 The communication node within the first vehicle 100, UE 236 may be composed of Figure 1 The person 130 carries the communication node.

[0074] The scenarios in which the side link communication is applied may be classified according to the locations of the UEs (eg, UEs 235 and 236) participating in the side link communication, as shown in Table 1 below. For example, Figure 2 The scenario of side link communication between UE 235 and UE 236 shown in the figure can be side link communication scenario C.

[0075] Table 1

[0076] Sidelink communication scenario Location of UE 235 Location of UE 236 A Out of the coverage of base station 210 Out of the coverage of base station 210 B Within the coverage area of ​​base station 210 Out of the coverage of base station 210 C Within the coverage area of ​​base station 210 Within the coverage area of ​​base station 210 D Within the coverage area of ​​base station 210 In the coverage area of ​​other base stations

[0077] On the other hand, a user plane protocol stack of a UE (eg, UE 235 and 236) performing sidelink communication may be configured as follows.

[0078] Figure 4 1 is a block diagram illustrating an exemplary embodiment of a user plane protocol stack of a UE performing sidelink communication. Figure 4 As shown, the UE on the left can be Figure 2 The UE 235 shown in FIG. 235 , the UE on the right may be Figure 2 UE 236 shown in . The scenario for the side link communication between UE 235 and UE 236 may be one of the side link communication scenarios A to D of Table 1. The user plane protocol stack of each of UE 235 and UE 236 may include a physical (PHY) layer, a medium access control (MAC) layer, a radio link control (RLC) layer, and a packet data convergence protocol (PDCP) layer.

[0079] A PC5 interface (e.g., PC5-U interface) may be used to perform sidelink communication between UE 235 and UE 236. A layer 2 identifier (ID) (e.g., source layer 2 ID, destination layer 2 ID) may be used for sidelink communication, and the layer 2 ID may be an ID configured for V2X communication (e.g., V2X service). In addition, in the sidelink communication, a hybrid automatic repeat request (HARQ) feedback operation may be supported, and an RLC acknowledged mode (RLC AM) or an RLC unacknowledged mode (RLC UM) may be supported.

[0080] On the other hand, the control plane protocol stack of the UE (eg, UE 235 and 236 ) performing sidelink communication may be configured as follows.

[0081] Figure 5 2 is a block diagram illustrating a first exemplary embodiment of a control plane protocol stack of a UE performing sidelink communication, Figure 6 1 is a block diagram showing a second exemplary embodiment of a control plane protocol stack of a UE performing sidelink communication. Figure 5 and 6 As shown, the UE on the left can be Figure 2 The UE 235 shown in FIG. 235 , the UE on the right may be Figure 2 The scenario for the side link communication between UE 235 and UE 236 may be one of the side link communication scenarios A to D of Table 1. Figure 5The control plane protocol stack shown in may be a control plane protocol stack for sending and receiving broadcast information (eg, a physical sidelink broadcast channel (PSBCH)).

[0082] Figure 5 The control plane protocol stack shown in may include a PHY layer, a MAC layer, an RLC layer, and a radio resource control (RRC) layer. A side link communication between UE 235 and UE 236 may be performed using a PC5 interface (eg, PC5-C interface). Figure 6 The control plane protocol stack shown in may be a control plane protocol stack for one-to-one sidelink communication. Figure 6 The control plane protocol stack shown in may include a PHY layer, a MAC layer, an RLC layer, a PDCP layer and a PC5 signaling protocol layer.

[0083] On the other hand, channels used in the sidelink communication between UE 235 and UE 236 may include a physical sidelink shared channel (PSSCH), a physical sidelink control channel (PSCCH), a physical sidelink discovery channel (PSDCH), and a physical sidelink broadcast channel (PSBCH). PSSCH may be used to transmit and receive sidelink data and may be configured in a UE (e.g., UE 235 or 236) through higher layer signaling. PSCCH may be used to transmit and receive sidelink control information (SCI) and may also be configured in a UE (e.g., UE 235 or 236) through higher layer signaling.

[0084] PSDCH can be used for discovery process. For example, discovery signal can be sent through PSDCH. PSBCH can be used to send and receive broadcast information (e.g., system information). In addition, demodulation reference signal (DM-RS), synchronization signal, etc. can be used in side link communication between UE235 and UE 236.

[0085] On the other hand, the sidelink transmission modes (TMs) may be classified into sidelink TMs 1 to 4 as shown in Table 2 below.

[0086] Table 2

[0087] SidelinkTM describe 1 Transmit using resources scheduled by the base station 2 UE autonomous transmission without scheduling base station 3 V2X communication uses resources scheduled by the base station for transmission 4 UE autonomous transmission without scheduling base station in V2X communication

[0088] When supporting sidelink TM 3 or 4, each of UE 235 and 236 can be configured to perform sidelink communication using a resource pool configured by base station 210. A resource pool can be configured for each of sidelink control information and sidelink data. A resource pool for sidelink control information can be configured based on an RRC signaling process (e.g., a dedicated RRC signaling process, a broadcast RRC signaling process, etc.). A resource pool for receiving sidelink control information can be configured by a broadcast RRC signaling process. When supporting sidelink TM 3, a resource pool for sending sidelink control information can be configured by a dedicated RRC signaling process.

[0089] In particular, the sidelink control information may be sent via resources scheduled by the base station 210 within a resource pool configured by a dedicated RRC signaling process. When sidelink TM 4 is supported, a resource pool for sending the sidelink control information may be configured by a dedicated RRC signaling process or a broadcast RRC signaling process. The sidelink control information may be sent via resources autonomously selected by a UE (e.g., UE 235 or 236) within a resource pool configured by a dedicated RRC signaling process or a broadcast RRC signaling process.

[0090] When side link TM 3 is supported, a resource pool for sending and receiving side link data may not be configured. In particular, side link data may be sent and received via resources scheduled by base station 210. When side link TM 4 is supported, a resource pool for sending and receiving side link data may be configured through a dedicated RRC signaling process or a broadcast RRC signaling process. Side link data may be sent and received through resources autonomously selected by a UE (e.g., UE 235 or 236) within a resource pool configured by a dedicated RRC signaling process or a broadcast RRC signaling process.

[0091] In addition, a side link resource configuration method will be described. Even when describing a method to be performed at a first communication node in a communication node (e.g., sending or receiving a signal), the corresponding second communication node may be configured to perform a method corresponding to the method performed at the first communication node (e.g., receiving or sending a signal). That is, when describing the operation of UE#1 (e.g., a first vehicle), the corresponding UE#2 (e.g., a second vehicle) may be configured to perform an operation corresponding to the operation of UE#1. Conversely, when describing the operation of UE#2 (e.g., a second vehicle), the corresponding UE#1 (e.g., a first vehicle) may be configured to perform an operation corresponding to the operation of UE#2. In the exemplary embodiments described below, the operation of the vehicle may be the operation of a communication node located within the vehicle.

[0092] In a communication system, downlink (DL) resources, uplink (UL) resources, and sidelink (SL) resources may be configured. DL resources may be used for DL ​​communication between a base station and a UE (e.g., a vehicle). UL resources may be used for UL communication between a base station and a UE (e.g., a vehicle). SL resources may be used for SL communication between UEs (e.g., vehicles). DL resources, UL resources, and SL resources may be configured as follows.

[0093] Figure 7 1 is a conceptual diagram showing a first exemplary embodiment of a DL-UL transmission period including DL resources, UL resources, and SL resources in a communication system. Figure 7 As shown, a DL-UL transmission period may be configured, and DL resources and UL resources may be configured within the DL-UL transmission period. In addition, SL resources may be additionally configured within the DL-UL transmission period. In particular, the DL-UL transmission period may be referred to as a DL-SL-UL transmission period. Resources that are not configured as DL resources, UL resources, or SL resources within the DL-UL transmission period may be configured as flexible (FL) resources, and FL resources may be replaced (override) with DL resources, UL resources, or SL resources.

[0094] The length (e.g., period) of the DL-UL transmission period may be approximately 0.5 ms, 0.625 ms, 1 ms, 1.25 ms, 2.5 ms, 5 ms, or 10 ms. In other words, the DL-UL transmission period may be repeated every approximately 0.5 ms, 0.625 ms, 1 ms, 1.25 ms, 2.5 ms, 5 ms, or 10 ms on the time axis. For example, a plurality of DL-UL transmission periods may be configured continuously on the time axis, and DL resources, UL resources, and SL resources may be configured identically on the plurality of DL-UL transmission periods.

[0095] The DL resource may be indicated by a DL pattern described in the following Table 3. In particular, a DL slot may be a slot consisting of only DL symbols, and the DL symbols may be used for DL ​​communication.

[0096] Table 3

[0097]

[0098] The UL resource may be indicated by a UL pattern described in the following Table 4. In particular, a UL slot may be a slot consisting of only UL symbols, and the UL symbols may be used for UL communication.

[0099] Table 4

[0100]

[0101] SL resources may be indicated by the SL pattern described in Table 5 below. In particular, the SL slot may be a slot consisting of only SL symbols, and the SL symbols may be used for SL communication. When there are multiple SL periods for SL communication within one DL-UL transmission period, multiple SL patterns may be configured. For example, when there are SL period #1 and SL period #2 within one DL-UL transmission period, SL pattern #1 indicating SL period #1 may be configured and SL pattern #2 indicating SL period #2 may be configured.

[0102] Table 5

[0103]

[0104] Used to indicate via signaling Figure 7 The method of information of DL resources, UL resources and SL resources shown in can be configured as follows.

[0105] Figure 8 FIG. 1 is a sequence diagram showing a first exemplary embodiment of a resource configuration information signaling method in a communication system. Figure 8 As shown, the communication system may include a base station and a UE. The base station may be Figure 2 The base station 210 shown in FIG. 1 and the UE may be Figure 2 The base station and the UE may be configured to communicate with one of the UEs 231 to 236 shown in FIG. Figure 3 The communication node 300 shown in FIG. 1 is the same as or similar to the communication node 300 shown in FIG. 1 . The UE may support Figures 4 to 6 The protocol stack shown in .

[0106] The base station may be configured to generate TDD-UL-DL-configuration common information (e.g., 'TDD-UL-DL-ConfigCommon') (S800). The TDD-UL-DL-configuration common information may include information indicating a subcarrier spacing and TDD-UL-DL-pattern #1. In addition, the TDD-UL-DL-configuration common information may further include TDD-UL-DL-pattern #2. TDD-UL-DL-pattern #2 may be used optionally.

[0107] TDD-UL-DL-pattern #1 may include information indicating a period (e.g., length) of a DL-UL transmission period, a DL pattern described in Table 3, and a UL pattern described in Table 4. In addition, TDD-UL-DL-pattern #1 may further include an SL pattern described in Table 5. Some parameters in the SL pattern may be included in TDD-UL-DL-pattern #1. For example, (I S-SSLOT and I S-ESLOT )、(I S-SSLOT and N S-SLOT ) or (I S-ESLOT and NS-SLOT ) may be included in TDD-UL-DL-pattern #1, and when there are consecutive SL symbols, N S-SSYM and N S-ESYM At least one of may be further included in TDD-UL-DL-pattern #1.

[0108] When the TDD-UL-DL-configuration common information includes TDD-UL-DL-pattern #2, TDD-UL-DL-pattern #2 may include at least one of the DL pattern described in Table 3, the UL pattern described in Table 4, and the SL pattern described in Table 5. In addition, TDD-UL-DL-pattern #2 may further include information indicating a period (e.g., length) of a DL-UL transmission period. The DL pattern, UL pattern, and SL pattern included in TDD-UL-DL-pattern #2 may be different from the DL pattern, UL pattern, and SL pattern included in TDD-UL-DL-pattern #1, respectively.

[0109] When the TDD-UL-DL-configuration common information includes TDD-UL-DL-pattern #1 and TDD-UL-DL-pattern #2, DL-UL transmission period #1 according to TDD-UL-DL-pattern #1 and DL-UL transmission period #2 according to TDD-UL-DL-pattern #2 may be configured on the time axis. DL-UL transmission period #2 may be continuous with DL-UL transmission period #1. In other words, (DL-UL transmission period #1+DL-UL transmission period #2) may be periodically repeated on the time axis, and the length of (DL-UL transmission period #1+DL-UL transmission period #2) may be equal to or less than about 20 ms.

[0110] The base station may be configured to send system information (e.g., system information block (SIB)) including TDD-UL-DL-configuration common information (S810). The UE may be configured to receive system information from the base station and identify the TDD-UL-DL-configuration common information included in the system information (S820). Therefore, the UE may be configured to identify the DL-UL transmission period based on the TDD-UL-DL-configuration common information, and identify at least one of the DL resources, UL resources, and SL resources within the DL-UL transmission period. In particular, the UE may perform DL communication with the base station using DL resources, perform UL communication with the base station using UL resources, and perform SL communication with other UEs using SL resources.

[0111] The base station may be further configured to: generate TDD-UL-DL-configuration dedicated information (e.g., 'TDD-UL-DL-ConfigDedicated') when needed (S830). The TDD-UL-DL-configuration dedicated information may be used to reconfigure the FL resources (e.g., FL time slots or FL symbols) configured by the TDD-UL-DL-configuration common information into DL resources (e.g., DL time slots or DL ​​symbols), UL resources (e.g., UL time slots or UL symbols), or SL resources (e.g., SL time slots or SL symbols). The TDD-UL-DL-configuration dedicated information may include the time slot pattern described in Table 6 below. For example, the TDD-UL-DL-configuration dedicated information may include one or more parameters listed in Table 6 below.

[0112] Table 6

[0113]

[0114] The time slot configured by the TDD-UL-DL-configuration specific information may be as follows.

[0115] Fig. 9 FIG. 1 is a conceptual diagram showing a first exemplary embodiment of a time slot configured by TDD-UL-DL-configuration-specific information in a communication system. Fig. 9 As shown, according to TDD-UL-DL-configuration-specific information, symbols included in one slot may be configured as DL symbols, UL symbols, or SL symbols. In particular, one slot may not include FL symbols.

[0116] Fig.10 FIG. 2 is a conceptual diagram showing a second exemplary embodiment of a time slot configured by TDD-UL-DL-configuration-specific information in a communication system. Fig.10 As shown, according to TDD-UL-DL-configuration-specific information, symbols included in one slot may be configured as DL symbols, UL symbols, or SL symbols. Among the symbols included in one slot, symbols not configured as DL symbols, UL symbols, or SL symbols may be FL symbols.

[0117] Reference again Figure 8, the base station may be configured to send an RRC message including TDD-UL-DL-configuration dedicated information to the UE (S840). The RRC message including the TDD-UL-DL-configuration dedicated information may be a cell-specific RRC message or a UE-specific RRC message. The UE may be configured to: receive an RRC message from the base station, and identify the TDD-UL-DL-configuration dedicated information included in the RRC message (S850). Therefore, the UE may be configured to: identify at least one of the DL resources, UL resources and SL resources configured by the TDD-UL-DL-configuration common information and the TDD-UL-DL-configuration dedicated information. In particular, the UE may perform DL communication with the base station using DL resources, perform UL communication with the base station using UL resources, and perform SL communication with other UEs using SL resources.

[0118] On the other hand, resources (e.g., DL resources, UL resources, SL resources) configured by TDD-UL-DL-configuration common information or (TDD-UL-DL-configuration common information + TDD-UL-DL-configuration dedicated information) can be reconfigured by a slot format indicator (SFI). For example, SFI can be used to reconfigure FL resources configured by TDD-UL-DL-configuration common information or (TDD-UL-DL-configuration common information + TDD-UL-DL-configuration dedicated information) into DL symbols, UL symbols, or SL symbols. SFI can be configured as shown in Table 7 below. SFI may not be limited to the examples shown in Table 7 below, and various configurations may be performed. In Table 7, 'D' may indicate DL symbols, 'U' may indicate UL symbols, 'S' may indicate SL symbols, and 'F' may indicate FL symbols.

[0119] Table 7

[0120]

[0121] The base station may be configured to generate downlink control information (DCI) including SFI (S860). The DCI including SFI may be DCI format 2_0. The base station may be configured to send the DCI including SFI to the UE via a physical downlink control channel (PDCCH) (S870). The UE may be configured to receive DCI from the base station and identify the SFI included in the DCI (S880). Therefore, the UE may be configured to identify one or more of the DL resources, UL resources, and SL resources configured by (TDD-UL-DL-configuration common information + DCI) or (TDD-UL-DL-configuration common information + TDD-UL-DL-configuration dedicated information + DCI). In particular, the UE may be configured to perform DL communication with the base station using DL resources, perform UL communication with the base station using UL resources, and perform SL communication with other UEs using SL resources.

[0122] On the other hand, UL resources can be used as SL resources in the communication system. In particular, the base station can be configured to: send information indicating the UL resources used as SL resources in the UL resources (hereinafter referred to as "SL reconfiguration pattern") to the UE. For example, the base station can be configured to: generate TDD-UL-DL-configuration common information including information indicating the subcarrier spacing and pattern #1. The TDD-UL-DL-configuration common information may further include pattern #2. Each of pattern #1 and pattern #2 may include the DL pattern described in Table 3 and the UL pattern described in Table 4. In addition, each of pattern #1 and pattern #2 may further include the SL reconfiguration pattern described in Table 8 below. The SL reconfiguration pattern may include one or more parameters (N') described in Table 8 S-SLOT 、N' S-SSYM 、N' S-ESYM , I' S-SSLOT , I' S-ESLOT ).

[0123] Table 8

[0124]

[0125] Therefore, some of the UL resources belonging to the UL period configured by the UL pattern may be reconfigured into SL resources by the SL reconfiguration pattern. The SL resources reconfigured by the SL reconfiguration pattern may be as follows.

[0126] Fig.11 1 is a conceptual diagram showing a second exemplary embodiment of a DL-UL transmission period including DL resources, UL resources, and SL resources in a communication system. Fig.11As shown, a DL-UL transmission period may be configured, and a DL period and a UL period may be configured within the DL-UL transmission period. The DL period may be configured by a DL pattern included in the TDD-UL-DL-configuration common information, and the UL period may be configured by a UL pattern included in the TDD-UL-DL-configuration common information.

[0127] In addition, some UL resources in the UL period can be reconfigured as SL resources through the SL reconfiguration pattern included in the TDD-UL-DL-configuration common information. Therefore, when receiving the TDD-UL-DL-configuration common information from the base station, the UE can be configured to: identify one or more of the DL resources, UL resources and SL resources indicated by the TDD-UL-DL-configuration common information, and use the corresponding resources to perform DL communication, UL communication or SL communication.

[0128] Alternatively, the SL reconfiguration pattern may be included in the TDD-UL-DL-configuration dedicated information instead of being included in the TDD-UL-DL-configuration common information. In particular, some UL resources belonging to the UL period configured by the TDD-UL-DL-configuration common information may be reconfigured as SL resources by the SL reconfiguration pattern included in the TDD-UL-DL-configuration dedicated information. Therefore, when receiving the TDD-UL-DL-configuration common information and the TDD-UL-DL-configuration dedicated information from the base station, the UE may be configured to: identify the DL resources and UL resources indicated by the TDD-UL-DL-configuration common information, and identify the UL resources in the UL resources indicated by the TDD-UL-DL-configuration common information that are to be reconfigured as SL resources by the TDD-UL-DL-configuration dedicated information. The UE may be configured to: perform DL communication, UL communication, or SL communication using the resources configured by the UL-DL-configuration common information and the UL-DL-configuration dedicated information.

[0129] Alternatively, the SL reconfiguration pattern may be included in the DCI instead of being included in the TDD-UL-DL-configuration common information and the TDD-UL-DL-configuration dedicated information. In particular, some of the UL resources belonging to the UL period configured by the TDD-UL-DL-configuration common information or (TDD-UL-DL-configuration common information + TDD-UL-DL-configuration dedicated information) may be reconfigured as SL resources by the SL reconfiguration pattern included in the DCI.

[0130] Therefore, when receiving TDD-UL-DL-configuration common information and / or TDD-UL-DL-configuration dedicated information from the base station, the UE may be configured to: identify the DL resources and UL resources indicated by the TDD-UL-DL-configuration common information and / or the TDD-UL-DL-configuration dedicated information. Thereafter, when receiving a DCI including an SL reconfiguration pattern from the base station, the UE may be configured to: identify the UL resources to be reconfigured as SL resources by the DCI among the UL resources indicated by the TDD-UL-DL-configuration common information and / or the TDD-UL-DL-configuration dedicated information. The UE may be configured to: perform DL communication, UL communication or SL communication using resources configured by (UL-DL-configuration common information + DCI) or (UL-DL-configuration common information + UL-DL-configuration dedicated information + DCI).

[0131] On the other hand, SL resources may be configured by the UE, and side link communication may be performed using the SL resources configured by the UE.

[0132] Fig.12 1 is a sequence diagram showing a first exemplary embodiment of a side link communication method in a communication system. Fig.12 As shown, the communication system may include UE#1 and UE#2. For example, UE#1 may be Figure 2 UE 235 shown in FIG. 1 , UE#2 may be Figure 2 236 shown in FIG. UE#1 and UE#2 may each be connected to a base station and may be located within the coverage of the base station. Alternatively, UE#2 may be located outside the coverage of the base station. UE#1 and UE#2 may be configured to communicate with Figure 3 The communication node 300 shown in FIG. 1 is the same as or similar to the communication node 300 shown in FIG. 1 . UE#1 and UE#2 may support Figures 4 to 6 The protocol stack shown in .

[0133] UE#1 may reconfigure UL resources configured by at least one of TDD-UL-DL-configuration common information, TDD-UL-DL-configuration dedicated information, and DCI as SL resources (S1200). In addition, UE#1 may reconfigure FL resources configured by at least one of TDD-UL-DL-configuration common information, TDD-UL-DL-configuration dedicated information, and DCI as SL resources. UE#1 may be configured to: generate side link control information (SCI) including SL resource information indicating the reconfigured SL resources (S1210). The SL resource information may include one or more parameters listed in Table 9 below.

[0134] Table 9

[0135]

[0136] UL symbols included in a specific slot may be replaced with SL symbols through SL resource information as described below.

[0137] Fig.13 FIG. 2 is a conceptual diagram showing a first exemplary embodiment of a time slot configured by SL resource information in a communication system. Fig.13 As shown, the symbols included in one time slot may be configured as DL symbols, UL symbols, or FL symbols by at least one of UL-DL-configuration common information, UL-DL-configuration dedicated information, and DCI. Some UL symbols among the UL symbols included in one time slot may be reconfigured as SL symbols by SL resource information. Here, 'D' may indicate a DL symbol, 'U' may indicate a UL symbol, 'F' may indicate a FL symbol, and 'S' may indicate a SL symbol.

[0138] Reference again Fig.12 , UE#1 may send an SCI including SL resource information to UE#2 (S1220). UE#2 may be configured to receive the SCI from UE#1, and may be configured to identify the SL resource information included in the SCI (S1230). UE#1 and UE#2 may be configured to perform SL communication using the SL resources indicated by the SL resource information included in the SCI (S1240).

[0139] The exemplary embodiments of the present disclosure may be implemented as program instructions that can be executed by various computers and recorded on non-transitory computer-readable media. Non-transitory computer-readable media may include program instructions, data files, data structures, or combinations thereof. The program instructions recorded on non-transitory computer-readable media may be specifically designed and configured for the present disclosure, or may be known and available to those skilled in the art of computer software.

[0140] Examples of non-transitory computer-readable media may include hardware devices such as ROM, RAM, and flash memory, which are specifically configured to store and execute program instructions. Examples of program instructions include machine codes made by, for example, a compiler, and high-level language codes executable by a computer using an interpreter. The above exemplary hardware devices may be configured to operate as at least one software module to perform exemplary embodiments of the present disclosure, and vice versa.

[0141] Although the exemplary embodiments of the present disclosure and its advantages have been described in detail, it should be understood that various changes, substitutions, and alterations can be made herein without departing from the scope of the present disclosure.

Claims

1. A method of a base station, the method comprising the following steps: Sending time division duplex (TDD)-uplink-downlink configuration (TDD-UL-DL-configuration) common information for configuring a resource type to a user equipment (UE), where the resource type is a UL resource, a DL resource, or a flexible (FL) resource; Sending to the UE TDD-UL-DL-configuration dedicated information for reconfiguring the resource type configured by the TDD-UL-DL-configuration common information; sending downlink control information (DCI) to the UE, the DCI including a slot format indicator (SFI) for reconfiguring a resource type reconfigured by the TDD-UL-DL-configuration common information and the TDD-UL-DL-configuration dedicated information; and and performing UL communication with the UE using the TDD-UL-DL-configuration common information, the TDD-UL-DL-configuration dedicated information, and the UL resources indicated by the SFI, or performing DL communication with the UE using the TDD-UL-DL-configuration common information, the TDD-UL-DL-configuration dedicated information, and the DL resources indicated by the SFI.

2. The method according to claim 1, wherein: Based on the TDD-UL-DL-configuration dedicated information, reconfigure the FL resources configured by the TDD-UL-DL-configuration common information into UL resources or DL ​​resources, and Based on the SFI included in the DCI, the FL resources configured by the TDD-UL-DL-configuration common information and the TDD-UL-DL-configuration dedicated information are reconfigured into UL resources or DL ​​resources.

3. The method according to claim 1, wherein: The TDD-UL-DL-configuration common information is included in the system information transmitted from the base station, and The TDD-UL-DL-configuration dedicated information is included in a radio resource control (RRC) message transmitted from the base station.

4. The method according to claim 1, wherein: The TDD-UL-DL-configuration common information includes a DL-UL transmission period, a DL pattern indicating a DL resource, and a UL pattern indicating a UL resource, The DL pattern includes at least one of: information indicating the number of consecutive DL time slots from a start time point of the DL-UL transmission period, and information indicating the number of consecutive DL symbols from an end time point of the consecutive DL time slots, and The UL pattern includes at least one of: information indicating the number of consecutive UL time slots, and information indicating the number of consecutive UL symbols located before a first UL time slot among the consecutive UL time slots.

5. The method according to claim 1, wherein: The TDD-UL-DL-configuration specific information includes a time slot pattern, The time slot pattern includes at least one of the following: a time slot index, information indicating that all symbols contained in the time slot indicated by the time slot index are UL symbols, information indicating the number of consecutive UL symbols among all symbols contained in the time slot indicated by the time slot index, information indicating that all symbols contained in the time slot indicated by the time slot index are DL symbols, and information indicating the number of consecutive DL symbols among all symbols contained in the time slot indicated by the time slot index.

6. A method of a user equipment (UE), the method comprising the following steps: receiving time division duplex (TDD)-uplink-downlink configuration (TDD-UL-DL-configuration) common information for configuring a resource type from a base station, wherein the resource type is a UL resource, a DL resource, or a flexible (FL) resource; receiving, from the base station, TDD-UL-DL-configuration dedicated information for reconfiguring a resource type configured by TDD-UL-DL-configuration common information; receiving downlink control information (DCI) from the base station, the DCI including a slot format indicator (SFI) for reconfiguring a resource type configured by the TDD-UL-DL-configuration common information and the TDD-UL-DL-configuration dedicated information; and Perform UL communication with the base station using the UL resources indicated by the TDD-UL-DL-configuration common information, the TDD-UL-DL-configuration dedicated information and the SFI, or perform DL communication with the base station using the DL resources indicated by the TDD-UL-DL-configuration common information, the TDD-UL-DL-configuration dedicated information and the SFI.

7. The method according to claim 6, wherein: Based on the TDD-UL-DL-configuration dedicated information, reconfigure the FL resources configured by the TDD-UL-DL-configuration common information into UL resources or DL ​​resources, and Based on the SFI included in the DCI, the FL resources configured by the TDD-UL-DL-configuration common information and the TDD-UL-DL-configuration dedicated information are reconfigured into UL resources or DL ​​resources.

8. The method according to claim 6, wherein: The TDD-UL-DL-configuration common information is included in the system information received from the base station, and The TDD-UL-DL-configuration dedicated information is included in a radio resource control (RRC) message received from the base station.

9. The method according to claim 6, wherein: The TDD-UL-DL-configuration common information includes a DL-UL transmission period, a DL pattern indicating a DL resource, and a UL pattern indicating a UL resource, The DL pattern includes at least one of: information indicating the number of consecutive DL time slots from a start time point of the DL-UL transmission period, and information indicating the number of consecutive DL symbols from an end time point of the consecutive DL time slots, and The UL pattern includes at least one of: information indicating the number of consecutive UL time slots, and information indicating the number of consecutive UL symbols located before a first UL time slot among the consecutive UL time slots.

10. The method according to claim 6, wherein: The TDD-UL-DL-configuration specific information includes a time slot pattern, The time slot pattern includes at least one of the following: a time slot index, information indicating that all symbols contained in the time slot indicated by the time slot index are UL symbols, information indicating the number of consecutive UL symbols among all symbols contained in the time slot indicated by the time slot index, information indicating that all symbols contained in the time slot indicated by the time slot index are DL symbols, and information indicating the number of consecutive DL symbols among all symbols contained in the time slot indicated by the time slot index.

11. A user equipment (UE), the UE comprising: at least one processor, The at least one processor causes the UE to: receiving time division duplex (TDD)-uplink-downlink configuration (TDD-UL-DL-configuration) common information for configuring a resource type from a base station, the resource type being a UL resource, a DL resource, or a flexible (FL) resource; receiving, from the base station, TDD-UL-DL-configuration dedicated information for reconfiguring a resource type configured by the TDD-UL-DL-configuration common information; receiving downlink control information (DCI) from the base station, the DCI including a slot format indicator (SFI) for reconfiguring a resource type configured by the TDD-UL-DL-configuration common information and the TDD-UL-DL-configuration dedicated information; and Perform UL communication with the base station using the UL resources indicated by the TDD-UL-DL-configuration common information, the TDD-UL-DL-configuration dedicated information and the SFI, or perform DL communication with the base station using the DL resources indicated by the TDD-UL-DL-configuration common information, the TDD-UL-DL-configuration dedicated information and the SFI.

12. The UE according to claim 11, wherein: Based on the TDD-UL-DL-configuration dedicated information, reconfigure the FL resources configured by the TDD-UL-DL-configuration common information into UL resources or DL ​​resources, and Based on the SFI included in the DCI, the FL resources configured by the TDD-UL-DL-configuration common information and the TDD-UL-DL-configuration dedicated information are reconfigured into UL resources or DL ​​resources.

13. The UE according to claim 11, wherein: The TDD-UL-DL-configuration common information is included in the system information received from the base station, and The TDD-UL-DL-configuration dedicated information is included in a radio resource control (RRC) message received from the base station.

14. The UE according to claim 11, wherein: The TDD-UL-DL-configuration common information includes a DL-UL transmission period, a DL pattern indicating a DL resource, and a UL pattern indicating a UL resource, The DL pattern includes at least one of: information indicating the number of consecutive DL time slots from a start time point of the DL-UL transmission period, and information indicating the number of consecutive DL symbols from an end time point of the consecutive DL time slots, and The UL pattern includes at least one of: information indicating the number of consecutive UL time slots, and information indicating the number of consecutive UL symbols located before a first UL time slot among the consecutive UL time slots.

15. The UE according to claim 11, wherein: The TDD-UL-DL-configuration specific information includes a time slot pattern, The time slot pattern includes at least one of the following: a time slot index, information indicating that all symbols contained in the time slot indicated by the time slot index are UL symbols, information indicating the number of consecutive UL symbols among all symbols contained in the time slot indicated by the time slot index, information indicating that all symbols contained in the time slot indicated by the time slot index are DL symbols, and information indicating the number of consecutive DL symbols among all symbols contained in the time slot indicated by the time slot index.

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