Method for configuring sidelink resources in a communication system and apparatus for the method

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 a SL pattern indicating a SL resource, and transmitting system information including the TDD-UL-DL-configuration common information to a UE. Accordingly, the performance of the communication system is improved.

Description

TECHNICAL FIELD

[0001] The present disclosure relates generally to sidelink communication technology, and more particularly, to techniques for configuring sidelink resources. BACKGROUND

[0002] 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 a LTE-Advanced (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.

[0003] The 4G communication system and the 5G communication system support vehicle-to-everything (V2X) communication. The V2X communication supported in a cellular communication system (e.g., a 4G communication system, a 5G communication system, etc.) can be referred to as "cellular-V2X (C-V2X) communication". The V2X communication (e.g., C-V2X communication) can include vehicle-to-vehicle (V2V) communication, vehicle-to-infrastructure (V2I) communication, vehicle-to-pedestrian (V2P) communication, vehicle-to-network (V2N) communication, etc.

[0004] In a cellular communication system, the V2X communication (e.g., C-V2X communication) can 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 vehicles participating in V2V communication can be established, and the communication between vehicles can be performed using the sidelink channel.

[0005] Sidelink communication can be performed using sidelink resources. However, a method of configuring sidelink resources has not been clearly defined in the 3GPP LTE or NR specification. Therefore, there is a need to define a method for configuring sidelink resources. SUMMARY

[0006] Accordingly, exemplary embodiments of the present disclosure provide an apparatus and a method for configuring sidelink resources.

[0007] According to an example embodiment of the disclosure, a method of operating a base station in a communication system can include generating time division duplex (TDD)-uplink-downlink configuration (TDD-UL-DL-configuration) common information including information on a DL-UL transmission period, a DL pattern indicating DL resources, a UL pattern indicating UL resources, and a sidelink (SL) pattern indicating SL resources; and transmitting, to a user equipment (UE), system information including the TDD-UL-DL-configuration common information, wherein the DL resources, the UL resources, and the SL resources are included in the DL-UL transmission period, and resources other than the DL resources, the UL resources, and the SL resources among all resources included in the DL-UL transmission period are flexible resources.

[0008] The SL pattern can include at least one of information indicating a number of consecutive SL slots in the DL-UL transmission period, information indicating a number of consecutive SL symbols located before a starting SL slot among the consecutive SL slots, information indicating a number of consecutive SL symbols after an ending SL slot among the consecutive SL slots, an index of the starting SL slot, and an index of the ending SL slot. The SL pattern can be used to reconfigure one or more UL resources among the UL resources configured by the UL pattern as SL resources for SL communication.

[0009] The method of operating can further include generating TDD-UL-DL configuration dedicated information including a slot pattern indicating resources for SL communication among the flexible resources; and transmitting, to the UE, a radio resource control (RRC) message including the TDD-UL-DL configuration dedicated information. The slot pattern can include at least one of a slot index, information indicating that all symbols included in a slot indicated by the slot index are SL symbols, information indicating a 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 the consecutive SL symbols, and an index of an ending SL symbol among the consecutive SL symbols.

[0010] The method of operating can further include generating downlink control information (DCI) including a slot format indicator (SFI) indicating resources for SL communication among the flexible resources; and transmitting, to the UE, the DCI through a physical downlink control channel (PDCCH).

[0011] Also, according to an example embodiment of the disclosure, an operation method of a first user equipment (UE) in a communication system can include receiving, from a base station, system information including time division duplex (TDD)-uplink-downlink configuration (TDD-UL-DL-configuration) common information, and identifying information on a DL-UL transmission period, a DL pattern indicating DL resources, a UL pattern indicating UL resources, and a sidelink (SL) pattern indicating SL resources included in the TDD-UL-DL-configuration common information. The DL resources, the UL resources, and the SL resources are included in the DL-UL transmission period, and resources other than the DL resources, the UL resources, and the SL resources among all resources included in the DL-UL transmission period are flexible resources.

[0012] The SL pattern can include at least one of information indicating a number of consecutive SL slots in the DL-UL transmission period, information indicating a number of consecutive SL symbols located before a starting SL slot among the consecutive SL slots, information indicating a number of consecutive SL symbols located after an ending SL slot among the consecutive SL slots, an index of the starting SL slot, and an index of the ending SL slot. The SL pattern can be used to reconfigure one or more UL resources among the UL resources configured by the UL pattern as SL resources for SL communication.

[0013] The operation method can further include receiving, from the base station, a radio resource control (RRC) message including TDD-UL-DL-configuration dedicated information, identifying, from the TDD-UL-DL-configuration dedicated information, a slot pattern indicating resources for SL communication among the flexible resources, and performing DL communication, UL communication, or SL communication using the resources configured by the TDD-UL-DL-configuration common information and the TDD-UL-DL-configuration dedicated information.

[0014] The slot pattern can include at least one of a slot index, information indicating that all symbols included in a slot indicated by the slot index are SL symbols, information indicating a 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 the consecutive SL symbols, and an index of an ending SL symbol among the consecutive SL symbols.

[0015] The performing of the SL communication can further include transmitting, to a second UE, sidelink control information (SCI) including information indicating the SL resources configured by the TDD-UL-DL-configuration common information and the TDD-UL-DL-configuration dedicated information, and performing SL communication with the second UE using the SL resources indicated by the SCI.

[0016] The operation method can further include receiving downlink control information (DCI) from the base station, identifying a slot format indicator (SFI) indicating resources for SL communication in the flexible resources from the DCI, and performing DL communication, UL communication, or SL communication using the resources configured by the TDD-UL-DL-configuration common information and the SFI.

[0017] Further, according to an example embodiment of the disclosure, a base station in a communication system can 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 can be configured to generate time division duplex (TDD)-uplink-downlink configuration (TDD-UL-DL-configuration) common information including information on a DL-UL transmission period, a DL pattern indicating DL resources, a UL pattern indicating UL resources, and a sidelink (SL) pattern indicating SL resources, and transmit system information including the TDD-UL-DL-configuration common information to a user equipment (UE). The DL resources, the UL resources, and the SL resources are included in the DL-UL transmission period, and resources other than the DL resources, the UL resources, and the SL resources included in the DL-UL transmission period are flexible resources.

[0018] The SL pattern can include at least one of information indicating a number of consecutive SL slots in the DL-UL transmission period, information indicating a number of consecutive SL symbols located before a starting SL slot among the consecutive SL slots, information indicating a number of consecutive SL symbols located after an ending SL slot among the consecutive SL slots, an index of the starting SL slot, and an index of the ending SL slot. The SL pattern can be used to reconfigure one or more UL resources among the UL resources configured by the UL pattern as SL resources for SL communication.

[0019] The at least one instruction can be further configured to generate TDD-UL-DL-configuration dedicated information including a slot pattern indicating resources for SL communication in the flexible resources, and transmit a radio resource control (RRC) message including the TDD-UL-DL-configuration dedicated information to the UE. The slot pattern can include at least one of a slot index, information indicating that all symbols included in a slot indicated by the slot index are SL symbols, information indicating a 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 the consecutive SL symbols, and an index of an ending SL symbol among the consecutive SL symbols.

[0020] The at least one instruction can be further configured to: generate a downlink control information (DCI) including a slot format indicator (SFI) indicating resources for SL communication in the flexible resources; and transmit the DCI to the UE through a physical downlink control channel (PDCCH).

[0021] Also, according to an example embodiment of the disclosure, a first user equipment (UE) in a communication system can 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 can be configured to: receive, from a base station, system information including time division duplex (TDD)-uplink-downlink configuration (TDD-UL-DL-configuration) common information; and identify information on a DL-UL transmission period included in the TDD-UL-DL-configuration common information, a DL pattern indicating DL resources, a UL pattern indicating UL resources, and a sidelink (SL) pattern indicating SL resources.

[0022] The DL resources, the UL resources, and the SL resources are included in the DL-UL transmission period, and resources other than the DL resources, the UL resources, and the SL resources among all resources included in the DL-UL transmission period are flexible resources. The SL pattern can include at least one of information indicating a number of consecutive SL slots in the DL-UL transmission period, information indicating a number of consecutive SL symbols located before a starting SL slot among the consecutive SL slots, information indicating a number of consecutive SL symbols after an ending SL slot among the consecutive SL slots, an index of the starting SL slot, and an index of the ending SL slot. The SL pattern can be used to reconfigure one or more UL resources of the UL resources configured by the UL pattern as SL resources for SL communication.

[0023] The at least one instruction can be further configured to: receive, from the base station, a radio resource control (RRC) message including TDD-UL-DL-configuration dedicated information; identify, from the TDD-UL-DL-configuration dedicated information, a slot pattern indicating resources for SL communication in the flexible resources; and perform DL communication, UL communication, or SL communication by using the resources configured by the TDD-UL-DL-configuration common information and the TDD-UL-DL-configuration dedicated information.

[0024] The slot pattern can include at least one of a slot index, information indicating that all symbols included in a slot indicated by the slot index are SL symbols, information indicating a 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 the consecutive SL symbols, and an index of an ending SL symbol among the consecutive SL symbols.

[0025] The operation method can be further configured to receive downlink control information (DCI) from the base station, identify a slot format indicator (SFI) indicating resources for SL communication in the flexible resources from the DCI, and perform DL communication, UL communication, or SL communication using the resources configured by the TDD-UL-DL-configuration common information and the SFI.

[0026] The at least one instruction can be further configured to transmit, to the second UE, sidelink control information (SCI) including information indicating SL resources configured by the TDD-UL-DL-configuration common information and the SFI, and perform SL communication with the second UE by using the SL resources indicated by the SCI.

[0027] According to an exemplary embodiment of the disclosure, a sidelink (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 perform sidelink communication with another UE using the SL resource. Alternatively, the SL resource can be configured by the UE, and the UE can be configured to transmit, to the other UE, sidelink control information (SCI) including information indicating the SL resource. The UE can be configured to perform sidelink communication with the other UE using the SL resource indicated by the SCI. Accordingly, sidelink communication can be efficiently performed, and performance of a communication system can be improved. BRIEF DESCRIPTION OF DRAWINGS

[0028] Exemplary embodiments of the disclosure will become more fully understood from the detailed description and accompanying drawings, in which:

[0029] FIG. 1 A conceptual diagram to illustrate a V2X communication scenario according to an exemplary embodiment of the disclosure;

[0030] FIG. 2 A conceptual diagram to illustrate a cellular communication system according to an exemplary embodiment of the disclosure;

[0031] FIG. 3 A conceptual diagram to illustrate a communication node constituting a cellular communication system according to an exemplary embodiment of the disclosure;

[0032] FIG. 4 A block diagram to illustrate a user plane protocol stack in which a UE performs sidelink communication according to an exemplary embodiment of the disclosure;

[0033] FIG. 5 A block diagram to illustrate a control plane protocol stack in which a UE performs sidelink communication according to an exemplary embodiment of the disclosure;

[0034] FIG. 6 a block diagram to show a control plane protocol stack of a UE performing sidelink communication according to another example embodiment of the disclosure;

[0035] FIG. 7 a conceptual diagram to show a DL-UL transmission period including DL resources, UL resources, and SL resources in a communication system according to an example embodiment of the disclosure;

[0036] FIG. 8 a sequence diagram to show a resource configuration information signaling method in a communication system according to an example embodiment of the disclosure;

[0037] FIG. 9 a conceptual diagram to show a slot configured by TDD-UL-DL-configuration specific information in a communication system according to an example embodiment of the disclosure;

[0038] FIG. 10 a conceptual diagram to show a slot configured by TDD-UL-DL-configuration specific information in a communication system according to another example embodiment of the disclosure;

[0039] FIG. 11 a conceptual diagram to show a DL-UL transmission period including DL resources, UL resources, and SL resources in a communication system according to another example embodiment of the disclosure;

[0040] FIG. 12 a sequence diagram to show a sidelink communication method in a communication system according to an example embodiment of the disclosure; and

[0041] FIG. 13 a conceptual diagram to show a slot configured by SL resource information in a communication system according to an example embodiment of the disclosure.

[0042] It should be understood that the above-described drawings are not necessarily to scale, presenting a somewhat simplified representation of various features illustrative of the basic principles of the disclosure. Specific design features, including, for example, specific dimensions, orientations, locations, and shapes will be determined in part by the particular intended application and use environment. DETAILED DESCRIPTION

[0043] Exemplary embodiments of the disclosure are disclosed herein. However, specific structural and functional details disclosed herein are merely by way of describing exemplary embodiments of the disclosure. Thus, exemplary embodiments of the disclosure can be implemented in many alternative forms, and should not be construed as being limited to the exemplary embodiments of the disclosure set forth herein.

[0044] Accordingly, although the disclosure is capable of various modifications and alternative forms, specific exemplary embodiments thereof have been shown by way of example in the drawings and will herein be described in detail. It should be understood, however, that there is no intent to limit the disclosure to the particular forms disclosed, but on the contrary, the disclosure is to cover all modifications, equivalents, and alternatives falling within the spirit and scope of the disclosure. Like numbers refer to like elements throughout the description of the figures.

[0045] 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. For example, a first element could be termed a second element, and, similarly, a second element could be termed a first element, without departing from the scope of the present disclosure. As used herein, the term "and / or" includes any and all combinations of one or more of the associated listed items.

[0046] It will 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 intervening elements can be present. In contrast, when an element is referred to as being "directly connected" or "directly coupled" to another element, there are no intervening elements present. Other words used to describe the relationship between elements should be interpreted in a like fashion (i.e., "between" versus "directly between", "adjacent" versus "directly adjacent", etc.).

[0047] The terminology used herein is for the purpose of describing particular example embodiments only and is not intended to be limiting of the disclosure. As used herein, the singular forms "a", "an" and "the" are intended to include the plural forms as well, unless the context clearly indicates otherwise. It will be further understood that the terms "comprises", "comprising", "includes" and / or "including", when used herein, specify the presence of stated features, integers, steps, operations, elements, and / or components, but do not preclude the presence or addition of one or more other features, integers, steps, operations, elements, components, and / or groups thereof.

[0048] Unless otherwise defined, all terms (including technical and scientific terms) used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this disclosure belongs. It will be further understood that terms, such as those defined in commonly used dictionaries, should be interpreted as having a meaning that is consistent with their meaning in the context of the relevant art and will not be interpreted in an idealized or overly formal sense unless expressly so defined herein.

[0049] It should be understood that the term "vehicle" or "vehicle's" or other similar terms used herein include general motor vehicles, such as passenger cars including sport 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., fuel 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.

[0050] 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 that includes a memory and a processor. The memory is configured to store program instructions, and the processor is specifically programmed to execute the program instructions to perform one or more processes described further below. As described herein, the control unit can control the operation of a unit, module, component, etc. Furthermore, it should be understood that the following methods can be performed by a device (e.g., a communication node) that includes a control unit in combination with one or more other components, as would be understood by one of ordinary skill in the art.

[0051] In addition, the control unit of the present disclosure can be implemented as a non-transitory computer readable medium containing executable program instructions executed by a processor, controller, etc. Examples of the computer readable medium include, but are not limited to, ROM, RAM, compact disc (CD)-ROM, magnetic tapes, floppy disks, flash memories, smart cards, and optical data storage devices. The computer readable recording medium can also be distributed over a computer network, so that the program instructions are stored and executed in a distributed manner, for example, by a remote processing server or a controller area network (CAN).

[0052] Unless specifically stated or otherwise apparent from context, as used herein, the term "about" should be understood not to be to the nearest value, but rather within a range of normal tolerance in the art, for example within 2 standard deviations of the mean. "About" can be understood to be 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 clearly dictates otherwise, all numerical values provided herein are modified by the term "about".

[0053] Hereinafter, exemplary embodiments of the present disclosure will be described in greater detail with reference to the accompanying drawings. For the general understanding in describing the present disclosure, the same components are denoted by the same reference numerals in the drawings, and repetitive description thereof will be omitted.

[0054] FIG. 1 To illustrate a conceptual diagram of a V2X communication scenario. As FIG. 1As shown, V2X communication can include vehicle-to-vehicle (V2V) communication, vehicle-to-infrastructure (V2I) communication, vehicle-to-pedestrian (V2P) communication, vehicle-to-network (V2N) communication, etc. V2X communication can be supported by a cellular communication system (e.g., the cellular communication system 140), and V2X communication supported by the cellular communication system 140 can be referred to as “cellular-V2X (C-V2X) communication.” Here, the cellular communication system 140 can 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.

[0055] V2V communication can include communication between the first vehicle 100 (e.g., a communication node located within the vehicle 100) and the second vehicle 110 (e.g., a communication node located within the vehicle 110). Various driving information such as speed, heading, time, location, etc. can be exchanged between the vehicle 100 and the vehicle 110 via V2V communication. For example, automatic driving (e.g., platooning) can be supported based on driving information exchanged via V2V communication. V2V communication supported in the cellular communication system 140 can be performed based on a “sidelink” communication technique (e.g., a ProSe and D2D communication technique, etc.). In particular, communication between the vehicle 100 and the vehicle 110 can be performed using at least one sidelink channel established between the vehicle 100 and the vehicle 110.

[0056] V2I communication can include communication between the first vehicle 100 (e.g., a communication node located within the vehicle 100) and an infrastructure (e.g., a road side unit (RSU)) 120 located at a roadside. The infrastructure 120 can also include a traffic light or a street light located at a roadside. For example, when V2I communication is performed, communication can be performed between a communication node located within the first vehicle 100 and a communication node located in the traffic light. Traffic information, driving information, etc. can be exchanged between the first vehicle 100 and the infrastructure 120 via V2I communication. V2I communication supported in the cellular communication system 140 can be performed based on a “sidelink” communication technique (e.g., a ProSe and D2D communication technique, etc.). In particular, communication between the vehicle 100 and the infrastructure 120 can be performed using at least one sidelink channel established between the vehicle 100 and the infrastructure 120.

[0057] V2P communication can include communication between the first vehicle 100 (e.g., a communication node located within the vehicle 100) and the person 130 (e.g., a communication node carried by the person 130). Travel information of the first vehicle 100 and movement information of the person 130, such as speed, heading, time, location, etc., can be exchanged between the vehicle 100 and the person 130 via the V2P communication. The communication node located within the vehicle 100 or the communication node carried by the person 130 can be configured to generate an alert indicating a danger by detecting a dangerous situation based on the obtained travel information and movement information. The V2P communication supported in the cellular communication system 140 can be performed based on sidelink communication techniques (e.g., ProSe and D2D communication techniques, etc.). In particular, the communication between the communication node located within the vehicle 100 and the communication node carried by the person 130 can be performed using at least one sidelink channel established between the communication nodes.

[0058] V2N communication can be communication between the first vehicle 100 (e.g., a communication node located within the vehicle 100) and a server connected via the cellular communication system 140. The V2N communication can be performed based on 4G communication techniques (e.g., LTE or LTE-A) or 5G communication techniques (e.g., NR). In addition, the V2N communication can be performed based on Wireless Access in Vehicular Environments (WAVE) communication techniques or Wireless Local Area Network (WLAN) communication techniques defined in the Institute of Electrical and Electronics Engineers (IEEE) 802.11, or Wireless Personal Area Network (WPAN) communication techniques defined in the IEEE 802.15.

[0059] Meanwhile, the cellular communication system 140 supporting V2X communication can be configured as follows.

[0060] FIG. 2 A conceptual diagram illustrating an embodiment of a cellular communication system is shown. As shown, the cellular communication system can include an access network, a core network, etc. The access network can include base stations 210, relays 220, user equipments (UEs) 231-236, etc. The UEs 231-236 can include communication nodes located within vehicles 100 and 110, communication nodes located within infrastructure 120, communication nodes carried by persons 130, etc. When the cellular communication system supports 4G communication techniques, the core network can include a serving gateway (S-GW) 250, a packet data network (PDN) gateway (P-GW) 260, a mobility management entity (MME) 270, etc. FIG. 2 FIG. 1 FIG. 1 FIG. 1

[0061] ​​​​When the cellular communication system supports a 5G communication technology, the core network can 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 (NSA) mode, the core network composed of the S-GW 250, the P-GW 260, and the MME 270 can support a 5G communication technology as well as a 4G communication technology, or the core network composed of the UPF 250, the SMF 260, and the AMF 270 can support a 4G communication technology as well as a 5G communication technology.

[0062] For example, when the cellular communication system supports a network slicing technology, the core network can be divided into a plurality of logical network slices. For example, a network slice supporting V2X communication (e.g., a V2V network slice, a V2I network slice, a V2P network slice, a V2N network slice, etc.) can be configured, and V2X communication can be supported through a V2X network slice configured in the core network.

[0063] A communication node (e.g., a base station, a relay, a UE, an S-GW, a P-GW, an MME, a UPF, an SMF, an AMF, etc.) including the cellular communication system can be configured to perform communication using at least one communication technology among a code division multiple access (CDMA) technology, a time division multiple access (TDMA) technology, a frequency division multiple access (FDMA) technology, an orthogonal frequency division multiplexing (OFDM) technology, a filtered OFDM technology, an orthogonal frequency division multiple access (OFDMA) technology, a single carrier FDMA (SC-FDMA) technology, a non-orthogonal multiple access (NOMA) technology, a generalized frequency division multiplexing (GFDM) technology, a filter bank multicarrier (FBMC) technology, a universal filtered multicarrier (UFMC) technology, and a spatial division multiple access (SDMA) technology.

[0064] A communication node (e.g., a base station, a relay, a UE, an S-GW, a P-GW, an MME, a UPF, an SMF, an AMF, etc.) including the cellular communication system can be configured as follows.

[0065] FIG. 3 To illustrate a conceptual diagram of an embodiment of a communication node constituting a cellular communication system. As shown in FIG. 3, FIG. 3 The communication node 300 can 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 can 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 can be configured to communicate with each other when connected via a bus 370.

[0066] However, each component included in the communication node 300 can 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 can 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 360 via a dedicated interface.

[0067] The processor 310 can be configured to execute at least one instruction stored in at least one of the memory 320 and the storage 360. The processor 310 can refer to a central processing unit (CPU), a graphics processing unit (GPU), or a dedicated processor on which a method according to an exemplary embodiment of the disclosure is executed. Each of the memory 320 and the storage 360 can include at least one of a volatile storage medium and a non-volatile storage medium. For example, the memory 320 can include at least one of a read-only memory (ROM) and a random access memory (RAM).

[0068] Referring again to FIG. 3, FIG. 2 In the communication system, the base station 210 can form a macro cell or a small cell, and can be connected to a core network via ideal backhaul or non-ideal backhaul. The base station 210 can 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 can belong to a cell coverage of the base station 210. The UEs 231, 232, 234, 235, and 236 can be connected to the base station 210 by performing a connection setup procedure with the base station 210. The UEs 231, 232, 234, 235, and 236 can be configured to communicate with the base station 210 after being connected to the base station 210.

[0069] The relay 220 can be connected to the base station 210, and can be configured to relay communication between the base station 210 and the UEs 233 and 234. That is, the relay 220 can 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 can belong to both a cell coverage of the base station 210 and a cell coverage of the relay 220, and the UE 233 can belong to the cell coverage of the relay 220. That is, the UE 233 can be located outside the cell coverage of the base station 210. The UEs 233 and 234 can be connected to the relay 220 by performing a connection setup procedure with the relay 220. The UEs 233 and 234 can be configured to communicate with the relay 220 after being connected to the relay 220.

[0070] The base station 210 and the relay 220 can support a multiple-input multiple-output (MIMO) technology (e.g., single-user (SU)-MIMO, multi-user (MU)-MIMO, massive MIMO, etc.), a coordinated multipoint (CoMP) communication technology, a carrier aggregation (CA) communication technology, a license-exempt band communication technology (e.g., licensed assisted access (LAA), enhanced LAA (eLAA), etc.), a sidelink communication technology (e.g., ProSe communication technology, D2D communication technology), etc. The UEs 231, 232, 235, and 236 can be configured to perform operations corresponding to the base station 210 and operations supported by the base station 210. The UEs 233 and 234 can be configured to perform operations corresponding to the relay 220 and operations supported by the relay 220.

[0071] In particular, the base station 210 can be referred to as a nodeB (NB), an evolved nodeB (eNB), a base transceiver station (BTS), a radio remote head (RRH), a transmission reception point (TRP), a radio unit (RU), a road side unit (RSU), a radio transceiver, an access point, an access node, etc. The relay 220 can be referred to as a small cell, a relay node, etc. Each of the UEs 231 to 236 can 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.

[0072] On the other hand, the communication between the UEs 235 and 236 can be performed based on a sidelink communication technology. The sidelink communication can 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, the UE 235 can be a communication node located in a first vehicle 100, and the UE 236 can be a communication node located in a second vehicle 110. When the V2I communication is performed using the sidelink communication technology, the UE 235 can be a communication node located in a first vehicle 100, and the UE 236 can be a communication node located in an infrastructure 120. When the V2P communication is performed using the sidelink communication technology, the UE 235 can be a communication node located in a first vehicle 100, and the UE 236 can be a communication node carried by a person 130. FIG. 1 FIG. 1 FIG. 1 FIG. 1 FIG. 1 FIG. 1

[0073] Scenarios to which the sidelink communication is applied can be classified according to locations of UEs (e.g., the UEs 235 and 236) participating in the sidelink communication, as shown in Table 1 below. For example, FIG. 2 The scenario of the sidelink communication between the UE 235 and the UE 236 shown in Table 1 above can be the sidelink communication scenario C.​​​​​​

[0074] Table 1

[0075] Sidelink communication scenarios Location of UE 235 Location of UE 236 A Out of coverage of base station 210 Out of coverage of base station 210 B In coverage of base station 210 Out of coverage of base station 210 C In coverage of base station 210 In coverage of base station 210 D In coverage of base station 210 In coverage of other base stations

[0076] On the other hand, a user plane protocol stack of a UE (e.g., UEs 235 and 236) performing sidelink communication can be configured as follows.

[0077] FIG. 4 A block diagram to illustrate an exemplary embodiment of a user plane protocol stack of a UE performing sidelink communication is shown. As shown, a left UE can be the UE 235 shown in FIG. 2B, and a right UE can be the UE 236 shown in FIG. 2B. A scenario for sidelink communication between the UE 235 and the UE 236 can be one of the sidelink communication scenarios A to D of Table 1. The user plane protocol stack of each of the UE 235 and the UE 236 can 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. FIG. 4 FIG. 2 FIG. 2

[0078] Sidelink communication between the UE 235 and the UE 236 can be performed using a PC5 interface (e.g., a PC5-U interface). A layer 2 identifier (ID) (e.g., a source layer 2 ID, a destination layer 2 ID) can be used for the sidelink communication, and the layer 2 ID can be an ID configured for V2X communication (e.g., a V2X service). Further, in the sidelink communication, a hybrid automatic repeat request (HARQ) feedback operation can be supported, and RLC acknowledgement mode (RLC AM) or RLC unacknowledged mode (RLC UM) can be supported.

[0079] On the other hand, a control plane protocol stack of a UE (e.g., UEs 235 and 236) performing sidelink communication can be configured as follows.

[0080] FIG. 5 A block diagram to illustrate a first exemplary embodiment of a control plane protocol stack of a UE performing sidelink communication is shown, FIG. 6 A block diagram to illustrate a second exemplary embodiment of a control plane protocol stack of a UE performing sidelink communication is shown. As shown, a left UE can be the UE 235 shown in FIG. 2B, and a right UE can be the UE 236 shown in FIG. 2B. A scenario for sidelink communication between the UE 235 and the UE 236 can be one of the sidelink communication scenarios A to D of Table 1. FIG. 5 6 FIG. 2 FIG. 2 FIG. 5 ​​​​​​​The control plane protocol stack shown in FIG. 2 can be a control plane protocol stack for transmitting and receiving broadcast information (e.g., physical sidelink broadcast channel (PSBCH)).

[0081] FIG. 5 The control plane protocol stack shown in FIG. 2 can include a PHY layer, a MAC layer, an RLC layer, and a radio resource control (RRC) layer. Sidelink communication between the UE 235 and the UE 236 can be performed using a PC5 interface (e.g., a PC5-C interface). FIG. 6 The control plane protocol stack shown in FIG. 2 can be a control plane protocol stack for one-to-one sidelink communication. FIG. 6 The control plane protocol stack shown in FIG. 2 can include a PHY layer, a MAC layer, an RLC layer, a PDCP layer, and a PC5 signaling protocol layer.

[0082] On the other hand, channels used in sidelink communication between the UE 235 and the UE 236 can 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). The PSSCH can be used for transmitting and receiving sidelink data, and can be configured in a UE (e.g., the UE 235 or 236) through higher layer signaling. The PSCCH can be used for transmitting and receiving sidelink control information (SCI), and can also be configured in a UE (e.g., the UE 235 or 236) through higher layer signaling.

[0083] The PSDCH can be used for a discovery procedure. For example, a discovery signal can be transmitted through the PSDCH. The PSBCH can be used for transmitting and receiving broadcast information (e.g., system information). In addition, a demodulation reference signal (DM-RS), a synchronization signal, etc. can be used in sidelink communication between the UE 235 and the UE 236.

[0084] On the other hand, a sidelink transmission mode (TM) can be classified into sidelink TMs 1 to 4, as shown in Table 2 below.

[0085] Table 2

[0086] Sidelink TM Description 1 Transmission using resources scheduled by a base station 2 UE autonomous transmission without scheduling base station 3 Transmission using resources scheduled by a base station in V2X communication 4 UE autonomous transmission without scheduling base station in V2X communication

[0087] When sidelink TM 3 or 4 is supported, each of the UEs 235 and 236 can be configured to perform sidelink communication using a resource pool configured by the base station 210. A resource pool can be configured for each of sidelink control information and sidelink data. The resource pool for sidelink control information can be configured based on a RRC signaling procedure (e.g., a dedicated RRC signaling procedure, a broadcast RRC signaling procedure, etc.). The resource pool for receiving sidelink control information can be configured by a broadcast RRC signaling procedure. When sidelink TM 3 is supported, the resource pool for transmitting sidelink control information can be configured by a dedicated RRC signaling procedure.

[0088] In particular, the sidelink control information can be transmitted via a resource scheduled by the base station 210 within the resource pool configured by the dedicated RRC signaling procedure. When sidelink TM 4 is supported, the resource pool for transmitting sidelink control information can be configured by a dedicated RRC signaling procedure or a broadcast RRC signaling procedure. The sidelink control information can be transmitted by a resource autonomously selected by a UE (e.g., the UE 235 or 236) within the resource pool configured by the dedicated RRC signaling procedure or the broadcast RRC signaling procedure.

[0089] When sidelink TM 3 is supported, the resource pool for transmitting and receiving sidelink data can not be configured. In particular, the sidelink data can be transmitted and received via a resource scheduled by the base station 210. When sidelink TM 4 is supported, the resource pool for transmitting and receiving sidelink data can be configured by a dedicated RRC signaling procedure or a broadcast RRC signaling procedure. The sidelink data can be transmitted and received by a resource autonomously selected by a UE (e.g., the UE 235 or 236) within the resource pool configured by the dedicated RRC signaling procedure or the broadcast RRC signaling procedure.

[0090] Further, a sidelink resource configuration method will be described. Even when a method (e.g., transmission or reception of a signal) to be performed at a first communication node among communication nodes is described, a corresponding second communication node can be configured to perform a method (e.g., reception or transmission of a signal) corresponding to the method performed at the first communication node. That is, when an operation of a UE#1 (e.g., a first vehicle) is described, a corresponding UE#2 (e.g., a second vehicle) can be configured to perform an operation corresponding to the operation of the UE#1. Conversely, when an operation of a UE#2 (e.g., a second vehicle) is described, a corresponding UE#1 (e.g., a first vehicle) can be configured to perform an operation corresponding to the operation of the UE#2. In the exemplary embodiments described below, an operation of a vehicle can be an operation of a communication node located within the vehicle.

[0091] In a communication system, downlink (DL) resources, uplink (UL) resources, and sidelink (SL) resources can be configured. The DL resources can be used for DL communication between a base station and a UE (e.g., a vehicle). The UL resources can be used for UL communication between the base station and the UE (e.g., a vehicle). The SL resources can be used for SL communication between UEs (e.g., vehicles). The DL resources, the UL resources, and the SL resources can be configured as follows.

[0092] FIG. 7 A conceptual diagram illustrating a first exemplary embodiment of a DL-UL transmission period including DL resources, UL resources, and SL resources in a communication system is shown. As shown in FIG. 1, a DL-UL transmission period can be configured, and DL resources and UL resources can be configured within the DL-UL transmission period. In addition, SL resources can be additionally configured within the DL-UL transmission period. In particular, the DL-UL transmission period can be referred to as a DL-SL-UL transmission period. Resources not configured as the DL resources, the UL resources, or the SL resources within the DL-SL-UL transmission period can be configured as flexible (FL) resources, and the FL resources can be overridden as the DL resources, the UL resources, or the SL resources. FIG. 7

[0093] The length (e.g., period) of the DL-UL transmission period can be about 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 can be repeated on a time axis every about 0.5 ms, 0.625 ms, 1 ms, 1.25 ms, 2.5 ms, 5 ms, or 10 ms. For example, a plurality of DL-UL transmission periods can be configured consecutively on a time axis, and the DL resources, the UL resources, and the SL resources can be identically configured over the plurality of DL-UL transmission periods.

[0094] The DL resources can be indicated by a DL pattern described in Table 3 below. In particular, a DL slot can be a slot composed of only DL symbols, and the DL symbols can be used for DL communication.

[0095] Table 3

[0096]

[0097] The UL resources can be indicated by a UL pattern described in Table 4 below. In particular, a UL slot can be a slot composed of only UL symbols, and the UL symbols can be used for UL communication.

[0098] Table 4

[0099]

[0100] ​The SL resource can be indicated by the SL pattern described in Table 5 below. In particular, the SL slot can be a slot composed of only SL symbols, and the SL symbol can be used for SL communication. When there are multiple SL slots for SL communication within one DL-UL transmission period, multiple SL patterns can be configured. For example, when there are SL slot #1 and SL slot #2 within one DL-UL transmission period, SL pattern #1 indicating the SL slot #1 can be configured and SL pattern #2 indicating the SL slot #2 can be configured.

[0101] Table 5

[0102]

[0103] Method for signaling information indicating FIG. 7 The method for signaling information indicating the DL resource, the UL resource, and the SL resource shown in FIG. 11 can be configured as follows.

[0104] FIG. 8 A sequence diagram for a first exemplary embodiment of a resource configuration information signaling method in a communication system is shown. As shown in FIG. 12, the communication system can include a base station and a UE. The base station can be the base station 210 shown in FIG. 10, and the UE can be one of the UEs 231 to 236 shown in FIG. 10. The base station and the UE can be configured the same as or similar to the communication node 300 shown in FIG. 10. The UE can support the protocol stack shown in FIG. 10. FIG. 8 FIG. 2 FIG. 2 FIG. 3 FIG. 4 to FIG. 6

[0105] The base station can be configured to generate TDD-UL-DL-ConfigCommon information (e.g., ‘TDD-UL-DL-ConfigCommon’) (S800). The TDD-UL-DL-ConfigCommon information can include information indicating a subcarrier spacing and a TDD-UL-DL-Pattern #1. In addition, the TDD-UL-DL-ConfigCommon information can further include a TDD-UL-DL-Pattern #2. The TDD-UL-DL-Pattern #2 can be optionally used.

[0106] The TDD-UL-DL-Pattern #1 can 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, the TDD-UL-DL-Pattern #1 can further include a SL pattern described in Table 5. Some parameters in the SL pattern can be included in the 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 N​​​​​S-SLOT ) can be included in the TDD-UL-DL-Pattern #1, and N S-SSYM and N S-ESYM at least one of them can be further included in the TDD-UL-DL-Pattern #1.

[0107] When the TDD-UL-DL-configurationCommon information includes the TDD-UL-DL-Pattern #2, the TDD-UL-DL-Pattern #2 can 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, the TDD-UL-DL-Pattern #2 can further include information indicating a period (e.g., length) of a DL-UL transmission period. The DL pattern, the UL pattern, and the SL pattern included in the TDD-UL-DL-Pattern #2 can be different from the DL pattern, the UL pattern, and the SL pattern included in the TDD-UL-DL-Pattern #1, respectively.

[0108] When the TDD-UL-DL-configurationCommon information includes the TDD-UL-DL-Pattern #1 and the TDD-UL-DL-Pattern #2, a DL-UL transmission period #1 according to the TDD-UL-DL-Pattern #1 and a DL-UL transmission period #2 according to the TDD-UL-DL-Pattern #2 can be configured on a time axis. The DL-UL transmission period #2 can be consecutive to the DL-UL transmission period #1. In other words, (DL-UL transmission period #1 + DL-UL transmission period #2) can be periodically repeated on a time axis, and a length of (DL-UL transmission period #1 + DL-UL transmission period #2) can be equal to or less than about 20 ms.

[0109] The base station can be configured to transmit system information (e.g., system information block (SIB)) including TDD-UL-DL-configurationCommon information (S810). The UE can be configured to receive the system information from the base station and identify the TDD-UL-DL-configurationCommon information included in the system information (S820). Accordingly, the UE can be configured to identify a DL-UL transmission period based on the TDD-UL-DL-configurationCommon information and identify at least one of a DL resource, an UL resource, and an SL resource within the DL-UL transmission period. In particular, the UE can perform DL communication with the base station using the DL resource, perform UL communication with the base station using the UL resource, and perform SL communication with other UEs using the SL resource.

[0110] The base station can be further configured to generate TDD-UL-DL-ConfigDedicated information (e.g., ‘TDD-UL-DL-ConfigDedicated’) when needed (S830). The TDD-UL-DL-ConfigDedicated information can be used to reconfigure FL resources (e.g., FL slots or FL symbols) configured by the TDD-UL-DL-ConfigCommon information as DL resources (e.g., DL slots or DL symbols), UL resources (e.g., UL slots or UL symbols), or SL resources (e.g., SL slots or SL symbols). The TDD-UL-DL-ConfigDedicated information can include the slot pattern described in Table 6 below. For example, the TDD-UL-DL-ConfigDedicated information can include one or more of the parameters listed in Table 6 below.

[0111] Table 6

[0112]

[0113] The slots configured by the TDD-UL-DL-ConfigDedicated information can be as follows.

[0114] FIG. 9 A conceptual diagram to illustrate a first exemplary embodiment of a slot configured by TDD-UL-DL-ConfigDedicated information in a communication system. As shown in FIG. 9 , according to the TDD-UL-DL-ConfigDedicated information, the symbols included in one slot can be configured as DL symbols, UL symbols, or SL symbols. In particular, one slot can not include FL symbols.

[0115] FIG. 10 A conceptual diagram to illustrate a second exemplary embodiment of a slot configured by TDD-UL-DL-ConfigDedicated information in a communication system. As shown in FIG. 10 , according to the TDD-UL-DL-ConfigDedicated information, the symbols included in one slot can be configured as DL symbols, UL symbols, or SL symbols. Among the symbols included in one slot, the symbols not configured as DL symbols, UL symbols, or SL symbols can be FL symbols.

[0116] Referring again to FIG. 8, the base station can be configured to transmit, to the UE, an RRC message including TDD-UL-DL-configuration dedicated information (S840). The RRC message including the TDD-UL-DL-configuration dedicated information can be a cell-specific RRC message or a UE-specific RRC message. The UE can be configured to receive, from the base station, the RRC message and identify the TDD-UL-DL-configuration dedicated information included in the RRC message (S850). Accordingly, the UE can be configured to identify at least one of 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 can perform DL communication with the base station using the DL resources, perform UL communication with the base station using the UL resources, and perform SL communication with other UEs using the SL resources.

[0117] On the other hand, a resource (e.g., DL resource, UL resource, SL resource) configured by the 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, the SFI can be used to reconfigure a FL resource configured by the TDD-UL-DL-configuration common information or (TDD-UL-DL-configuration common information + TDD-UL-DL-configuration dedicated information) as a DL symbol, an UL symbol, or an SL symbol. The SFI can be configured as shown in Table 7 below. The SFI can not be limited to the example shown in Table 7 below, and various configurations can be made. In Table 7, 'D' can indicate a DL symbol, 'U' can indicate an UL symbol, 'S' can indicate an SL symbol, and 'F' can indicate a FL symbol.

[0118] Table 7

[0119]

[0120] The base station can be configured to generate downlink control information (DCI) including the SFI (S860). The DCI including the SFI can be DCI format 2_0. The base station can be configured to transmit the DCI including the SFI to the UE through a physical downlink control channel (PDCCH) (S870). The UE can be configured to receive the DCI from the base station and identify the SFI included in the DCI (S880). Accordingly, the UE can be configured to identify one or more of the DL resources, the UL resources, and the SL resources configured by (TDD-UL-DL-ConfigCommon + DCI) or (TDD-UL-DL-ConfigCommon + TDD-UL-DL-ConfigDedicated + DCI). In particular, the UE can be configured to perform DL communication with the base station using the DL resources, perform UL communication with the base station using the UL resources, and perform SL communication with other UEs using the SL resources.

[0121] On the other hand, the UL resources can be used as the SL resources in the communication system. In particular, the base station can be configured to transmit information indicating UL resources used as the 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-ConfigCommon including information indicating subcarrier spacing and pattern #1. The TDD-UL-DL-ConfigCommon can further include pattern #2. Each of the pattern #1 and the pattern #2 can include the DL pattern described in Table 3 and the UL pattern described in Table 4. In addition, each of the pattern #1 and the pattern #2 can further include the SL reconfiguration pattern described in Table 8 below. The SL reconfiguration pattern can include one or more of the parameters (N' S-SLOT , N' S-SSYM , N' S-ESYM , I' S-SSLOT , I' S-ESLOT ).

[0122] Table 8

[0123]

[0124] Accordingly, some of the UL resources belonging to the UL period configured by the UL pattern can be reconfigured as the SL resources by the SL reconfiguration pattern. The SL resources reconfigured by the SL reconfiguration pattern can be as follows.

[0125] FIG. 11 A conceptual diagram illustrating a second exemplary embodiment of a DL-UL transmission period including DL resources, UL resources, and SL resources in a communication system. As described above, the DL resources, the UL resources, and the SL resources can be configured by (TDD-UL-DL-ConfigCommon + DCI) or (TDD-UL-DL-ConfigCommon + TDD-UL-DL-ConfigDedicated + DCI). In particular, the DL resources, the UL resources, and the SL resources can be configured by (TDD-UL-DL-ConfigCommon + DCI) or (TDD-UL-DL-ConfigCommon + TDD-UL-DL-ConfigDedicated + DCI) in the DL-UL transmission period. FIG. 11As illustrated, DL-UL transmission periods can be configured, and DL periods and UL periods can be configured within the DL-UL transmission periods. The DL periods can be configured by a DL pattern included in the TDD-UL-DL-configurationCommon information, and the UL periods can be configured by a UL pattern included in the TDD-UL-DL-configurationCommon information.

[0126] In addition, some of the UL resources in the UL periods can be reconfigured as SL resources by a SL reconfiguration pattern included in the TDD-UL-DL-configurationCommon information. Thus, when receiving the TDD-UL-DL-configurationCommon information from the base station, the UE can be configured to identify one or more of the DL resources, the UL resources, and the SL resources indicated by the TDD-UL-DL-configurationCommon information, and perform DL communication, UL communication, or SL communication using the corresponding resources.

[0127] Alternatively, the SL reconfiguration pattern can be included in the TDD-UL-DL-configurationDedicated information instead of being included in the TDD-UL-DL-configurationCommon information. In particular, some of the UL resources belonging to the UL periods configured by the TDD-UL-DL-configurationCommon information can be reconfigured as SL resources by a SL reconfiguration pattern included in the TDD-UL-DL-configurationDedicated information. Thus, when receiving the TDD-UL-DL-configurationCommon information and the TDD-UL-DL-configurationDedicated information from the base station, the UE can be configured to identify the DL resources and the UL resources indicated by the TDD-UL-DL-configurationCommon information, and identify the UL resources among the UL resources indicated by the TDD-UL-DL-configurationCommon information that are to be reconfigured as SL resources by the TDD-UL-DL-configurationDedicated information. The UE can be configured to perform DL communication, UL communication, or SL communication using the resources configured by the TDD-UL-DL-configurationCommon information and the TDD-UL-DL-configurationDedicated information.

[0128] Alternatively, the SL reconfiguration pattern can be included in the DCI instead of being included in the TDD-UL-DL-configurationCommon information and the TDD-UL-DL-configurationDedicated information. In particular, some of the UL resources belonging to the UL periods configured by the TDD-UL-DL-configurationCommon information or (TDD-UL-DL-configurationCommon information + TDD-UL-DL-configurationDedicated information) can be reconfigured as SL resources by a SL reconfiguration pattern included in the DCI.

[0129] Therefore, when receiving TDD-UL-DL-configuration common information and / or TDD-UL-DL-configuration dedicated information from the base station, the UE can be configured to: identify the DL resources and UL resources indicated by the TDD-UL-DL-configuration common information and / or TDD-UL-DL-configuration dedicated information. Subsequently, when receiving a DCI including an SL reconfiguration pattern from the base station, the UE can be configured to: identify the UL resources among the UL resources indicated by the TDD-UL-DL-configuration common information and / or TDD-UL-DL-configuration dedicated information that will be reconfigured as SL resources by the DCI. The UE can 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).

[0130] On the other hand, SL resources can be configured by the UE, and sidelink communication can be performed using SL resources configured by the UE.

[0131] FIG. 12 This is a sequence diagram illustrating a first exemplary embodiment of a sidelink communication method in a communication system. (See diagram below.) FIG. 12 As shown, the communication system may include UE#1 and UE#2. For example, UE#1 may be... FIG. 2 The UE 235 and UE#2 shown can be FIG. 2 As shown in Figure 236, each of UE#1 and UE#2 can connect to the base station and can be located within the coverage area of ​​the base station. Alternatively, UE#2 can be located outside the coverage area of ​​the base station. UE#1 and UE#2 can be configured to connect with... FIG. 3 The communication node 300 shown is the same or similar. UE#1 and UE#2 can support FIG. 4 to FIG. 6 The protocol stack shown.

[0132] UE#1 can reconfigure UL resources configured via at least one of TDD-UL-DL-configuration common information, TDD-UL-DL-configuration dedicated information, and DCI as SL resources (S1200). Additionally, UE#1 can reconfigure FL resources configured via at least one of TDD-UL-DL-configuration common information, TDD-UL-DL-configuration dedicated information, and DCI as SL resources. UE#1 can 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.

[0133] Table 9

[0134]

[0135] The UL symbols included in a particular slot can be replaced into SL symbols by the SL resource information as described below.

[0136] FIG. 13 A conceptual diagram illustrating a first exemplary embodiment of a slot configured by SL resource information in a communication system. As shown in FIG. 13 symbols included in one slot can 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 of the UL symbols included in one slot can be reconfigured as SL symbols by SL resource information. Here, 'D' can indicate DL symbols, 'U' can indicate UL symbols, 'F' can indicate FL symbols, and 'S' can indicate SL symbols.

[0137] Referring again to FIG. 12 , UE #1 can transmit SCI including SL resource information to UE #2 (S1220). UE #2 can be configured to receive the SCI from UE #1 and can be configured to identify the SL resource information included in the SCI (S1230). UE #1 and UE #2 can be configured to perform SL communication using the SL resource indicated by the SL resource information included in the SCI (S1240).

[0138] Exemplary embodiments of the present disclosure can be implemented as program instructions executable by various computers and recorded on non-transitory computer-readable media. The non-transitory computer-readable media can include program instructions, data files, data structures, or combinations thereof. The program instructions recorded on the non-transitory computer-readable media can be designed and configured specifically for the present disclosure, or can be well-known and available to those skilled in the computer software field.

[0139] Examples of the non-transitory computer-readable media can include hardware devices such as ROM, RAM, and flash memories, which are specially configured to store and execute program instructions. Examples of the program instructions include machine codes made by, for example, compilers, and high-level language codes executable by computers using interpreters. The above exemplary hardware devices can be configured to operate as at least one software module to execute exemplary embodiments of the present disclosure, and vice versa.

[0140] While exemplary embodiments of the present disclosure and their 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. An operation method for a first user equipment (UE) in a communication system, comprising the following steps: The processor receives system information from the base station, including common information on Time Division Duplex (TDD) uplink-downlink configuration (TDD-UL-DL-configuration); The processor identifies information about DL-UL transmission periods, DL patterns indicating DL resources, UL patterns indicating UL resources, and SL patterns indicating side link (SL) resources included in the TDD-UL-DL-configuration public information, wherein one or more resources not configured as DL resources, UL resources, or SL resources by the TDD-UL-DL-configuration public information are one or more flexible (FL) resources. The processor receives from the base station information indicating that FL symbols belonging to one or more FL resources be replaced with DL symbols or UL symbols; The processor performs communication with the base station using at least one of the DL resources indicated by the DL pattern, the UL resources indicated by the UL pattern, the alternative DL symbol, or the alternative UL symbol; The processor receives downlink control information (DCI) from the base station, including information indicating sidelink (SL) resources; The processor uses the SL resources to perform SL communication with the second UE; and The processor sends Side Link Control Information (SCI) to the second UE. The SCI includes information indicating the number of SL resources in the time domain and information about the first SL resource among the SL resources. The DL pattern includes information indicating the number of consecutive DL time slots from the start time of the DL-UL transmission period and information indicating the number of consecutive DL symbols from the end time of the consecutive DL time slots. The UL pattern includes information indicating the number of consecutive UL time slots and information indicating the number of consecutive UL symbols preceding the first UL time slot within the consecutive UL time slots. The end time of the consecutive UL time slots is the same as the end time of the DL-UL transmission period, and the end time of the consecutive UL symbols is the same as the start time of the consecutive UL time slots. The SL pattern includes information indicating the number of consecutive SL symbols before the start SL time slot in a consecutive SL time slot within a DL-UL transmission period, information indicating the number of SL symbols after the end SL time slot in the consecutive SL time slot, an index of the start SL time slot, and an index of the end SL time slot.

2. The operating method according to claim 1 further includes the following steps: The processor receives a Radio Resource Control (RRC) message from the base station, which includes TDD-UL-DL-configuration-specific information; as well as The processor identifies a time slot pattern from the TDD-UL-DL configuration-specific information indicating the resources used for the SL communication.

3. The operating method according to claim 2, wherein, The time slot pattern includes at least one of the following: 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 in all symbols included in the time slot indicated by the time slot index; The index of the first SL symbol in a series of SL symbols; and The index of the last SL symbol in a series of SL symbols.

4. A first user equipment (UE) in a communication system, the first UE comprising a processor, a transceiver operated by the processor, and a memory configured to store at least one instruction executable by the processor, wherein, When executed by the processor, the at least one instruction is configured to: System information received from the base station, including common information on Time Division Duplex (TDD) uplink-downlink configuration (TDD-UL-DL-configuration); Identify the information about DL-UL transmission periods, DL patterns indicating DL resources, UL patterns indicating UL resources, and SL patterns indicating side link (SL) resources included in the TDD-UL-DL-configuration public information, wherein one or more resources not configured as DL resources, UL resources, or SL resources by the TDD-UL-DL-configuration public information are one or more flexible (FL) resources. Receive information from the base station indicating that FL symbols belonging to one or more FL resources be replaced with DL symbols or UL symbols; Communication with the base station is performed using at least one of the DL resources indicated by the DL pattern, the UL resources indicated by the UL pattern, the alternative DL symbol, or the alternative UL symbol. Receive downlink control information (DCI) from the base station, including information indicating sidelink (SL) resources; Use the SL resources to perform SL communication with the second UE; and The second UE is sent side link control information (SCI), which includes information indicating the number of SL resources in the time domain and the first SL resource among the SL resources. The DL pattern includes information indicating the number of consecutive DL time slots from the start time of the DL-UL transmission period and information indicating the number of consecutive DL symbols from the end time of the consecutive DL time slots. The UL pattern includes information indicating the number of consecutive UL time slots and information indicating the number of consecutive UL symbols preceding the first UL time slot within the consecutive UL time slots. The end time of the consecutive UL time slots is the same as the end time of the DL-UL transmission period, and the end time of the consecutive UL symbols is the same as the start time of the consecutive UL time slots. The SL pattern includes information indicating the number of consecutive SL symbols before the start SL time slot in a consecutive SL time slot within a DL-UL transmission period, information indicating the number of SL symbols after the end SL time slot in the consecutive SL time slot, an index of the start SL time slot, and an index of the end SL time slot.

5. The first UE according to claim 4, wherein, The at least one instruction is also configured to: Receive from the base station a Radio Resource Control (RRC) message including TDD-UL-DL-configuration-specific information; and The time slot pattern of the resource used for the SL communication is identified from the TDD-UL-DL configuration-specific information.

6. The first UE according to claim 5, wherein, The time slot pattern includes at least one of the following: 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 in all symbols included in the time slot indicated by the time slot index; The index of the first SL symbol in a series of SL symbols; and The index of the last SL symbol in a series of SL symbols.

Images