Method and device for transmitting and receiving reference signals of side link data in wireless communication system

Abstract

The present disclosure relates to communication technologies and systems for integrating fifth generation (5G) communication systems with Internet of Things (IoT) technologies to support higher data rates beyond 4G systems. The present disclosure can be applied to smart services (e.g., smart homes, smart buildings, smart cities, smart cars or connected cars, health care, digital education, retail, security and safety related services, etc.) based on 5G communication technologies and IoT related technologies. The present disclosure provides a method and apparatus for allocating frequency resources and time resources for data transmission in a wireless communication system.

Description

Technical Field

[0001] The present disclosure relates to a wireless mobile communication system. More specifically, the present disclosure relates to a method and apparatus for finding a frequency-time resource to be sent and sending the frequency-time resource through which data is sent to a receiving terminal, i.e., resource allocation, in a process of sending and receiving data information in a vehicle terminal supporting vehicle communication (vehicle-to-everything, hereinafter referred to as "V2X") in communication between terminals (such as a side link with other vehicle terminals and pedestrian mobile terminals). Background Art

[0002] In order to meet the increasing demand for wireless services since the deployment of the fourth generation (4G) communication system, efforts have been made to develop an improved fifth generation (5G) or pre-5G communication system. Therefore, the 5G or pre-5G communication system is also called "beyond 4G network" or "post-LTE system". The 5G communication system defined by 3GPP is called "New Radio (NR) system".

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

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

[0005] In the 5G system, hybrid FSK and QAM modulation (FQAM) and sliding window superposition coding (SWSC) are also developed as advanced coding modulation (ACM), and filter bank multi-carrier (FBMC), non-orthogonal multiple access (NOMA) and sparse code multiple access (SCMA) are also developed as advanced access technologies.

[0006] The Internet, as a human-centered connectivity network in which humans generate and consume information, is now evolving toward the Internet of Things (IoT), in which distributed entities (such as things) exchange and process information without human intervention. The Internet of Everything (IoE) has emerged, which is a combination of IoT technology and big data processing technology by connecting with a cloud server. Since technical elements such as "detection technology", "wired / wireless communication and network infrastructure", "service interface technology" and "security technology" are required for IoT implementation, sensor networks, machine-to-machine (M2M) communication, machine type communication (MTC), etc. have been studied recently. Such an IoT environment can provide smart Internet technology services that create new value for human life by collecting and analyzing data generated between networked things. IoT can be applied to various fields including smart homes, smart buildings, smart cities, smart cars or connected cars, smart grids, healthcare, smart appliances, and advanced medical services through the integration and combination of existing information technology (IT) with various industrial applications.

[0007] In line with this, various attempts have been made to apply 5G communication systems to IoT networks. For example, technologies such as sensor networks, machine type communications (MTC), and machine-to-machine (M2M) communications can be implemented through beamforming, MIMO, and array antennas. Cloud radio access networks (RANs) as an application of the above-mentioned big data processing technologies can also be considered as an example of the fusion of 5G technology and IoT technology.

[0008] In line with the development of communication systems, vehicle-to-everything (V2X) systems have been developed in various ways.

[0009] The above information is provided as background information only to assist with understanding the present disclosure. No determination has been made, and no assertion is made, as to whether any of the above may be applicable as prior art to the present disclosure. Summary of the invention

[0010] Technical issues

[0011] Enhanced V2X related operations are required for the next generation of wireless communication systems.

[0012] Technical Solution

[0013] Various aspects of the present disclosure are intended to at least solve the above-mentioned problems and / or disadvantages, and to provide at least the advantages described below. Accordingly, one aspect of the present disclosure is to provide a wireless communication system, and more specifically, to provide a method and apparatus for selecting transmission resources in a process in which a vehicle terminal supporting vehicle-to-everything (V2X) exchanges information with another vehicle terminal and a pedestrian mobile terminal by using a side link. Specifically, the present disclosure relates to a reference for selecting resources in conjunction with a case in which a terminal directly allocates side link transmission resources by detection, and operations of a base station and a terminal therefor. In addition, the present disclosure provides a method and apparatus for sending and receiving a physical side link shared channel demodulation reference signal (DMRS) for side link data transmission / reception.

[0014] Additional aspects will be set forth in part in the description which follows and, in part, will be obvious from the description, or may be learned by practice of the presented embodiments.

[0015] According to one aspect of the present disclosure, a method for solving the above-mentioned problem by a first terminal is provided. The method of the first terminal comprises the following steps: identifying the number of symbols used for physical sidelink shared channel (PSSCH) transmission and the number of symbols used for PSSCH DMRS; sending sidelink control information (SCI) for scheduling PSSCH transmission to a second terminal, the SCI including DMRS pattern information identified based on the number of symbols used for PSSCH DMRS; and sending PSSCH DMRS to the second terminal at a position identified based on the SCI. The symbol index of the position where the PSSCH DMRS is sent is identified by one of a plurality of index groups, which are included in a first index group with a symbol number of 2 for PSSCH DMRS, a second index group with a symbol number of 3 for PSSCH DMRS, and a third index group with a symbol number of 4 for PSSCH DMRS. The first index group includes {1,5}, {3,8}, {3,10}, {4,8} and {4,10}, the second index group includes {1,4,7}, {1,5,9} and {1,6,11}, and the third index group includes {1,4,7,10}.

[0016] According to another aspect of the present disclosure, a method for solving the above-mentioned problem by a second terminal is provided. The method of the second terminal comprises the following steps: receiving an SCI for scheduling PSSCH transmission from a first terminal, the SCI including DMRS pattern information identified based on the number of symbols used for PSSCH DMRS; identifying the number of symbols used for PSSCH transmission and the number of symbols used for PSSCH DMRS based on the SCI; and receiving PSSCH DMRS from the first terminal at a position identified based on the SCI. The symbol index of the position where the PSSCH DMRS is received is identified by one of a plurality of index groups, which are included in a first index group for a PSSCH DMRS with a symbol number of 2, a second index group for a PSSCH DMRS with a symbol number of 3, and a third index for when the number of symbols of the PSSCH DMRS is 4. The first index group includes {1,5}, {3,8}, {3,10}, {4,8} and {4,10}, the second index group includes {1,4,7}, {1,5,9} and {1,6,11}, and the third index group includes {1,4,7,10}.

[0017] According to another aspect of the present disclosure, a first terminal for solving the above-mentioned problem is provided. The first terminal includes: a transceiver configured to send and receive signals; and at least one processor coupled to the transceiver. The at least one processor is configured to: identify the number of symbols used for PSSCH transmission and the number of symbols used for PSSCH DMRS; send an SCI for scheduling PSSCH transmission to a second terminal, the SCI including DMRS pattern information identified based on the number of symbols used for PSSCH DMRS; and send PSSCH DMRS to the second terminal at a position identified based on the SCI. The symbol index of the position where the PSSCH DMRS is sent is identified by one of a plurality of index groups, and the plurality of index groups are included in a first index group with a symbol number of 2 for PSSCH DMRS, a second index group with a symbol number of 3 for PSSCH DMRS, and a third index group with a symbol number of 4 for PSSCH DMRS. The first index group includes {1,5}, {3,8}, {3,10}, {4,8} and {4,10}, the second index group includes {1,4,7}, {1,5,9} and {1,6,11}, and the third index group includes {1,4,7,10}.

[0018] According to another aspect of the present disclosure, a second terminal for solving the above-mentioned problem is provided. The second terminal includes: a transceiver configured to send and receive signals; and at least one processor coupled to the transceiver. The at least one processor is configured to: receive an SCI for scheduling PSSCH transmission from a first terminal, the SCI including DMRS pattern information identified based on the number of symbols used for PSSCH DMRS; identify the number of symbols used for PSSCH transmission and the number of symbols used for PSSCH DMRS based on the SCI; and receive PSSCH DMRS from the first terminal at a position identified based on the SCI. The symbol index of the position where the PSSCH DMRS is received is identified by one of a plurality of index groups, the plurality of index groups being included in a first index group having a symbol number of 2 for the PSSCH DMRS, a second index group having a symbol number of 3 for the PSSCH DMRS, and a third index group having a symbol number of 4 for the PSSCH DMRS. The first index group includes {1,5}, {3,8}, {3,10}, {4,8} and {4,10}, the second index group includes {1,4,7}, {1,5,9} and {1,6,11}, and the third index group includes {1,4,7,10}.

[0019] The present disclosure proposes a method for performing detection and resource allocation while minimizing the power consumed by a terminal during side link communication, and the method can be effectively used to optimize the power consumption of the terminal. In addition, according to an embodiment of the present disclosure, a DRMS ​​for side link data can be efficiently sent / received.

[0020] Other aspects, advantages, and salient features of the disclosure will become apparent to those skilled in the art from the following detailed description, which, taken in conjunction with the annexed drawings, discloses various embodiments of the disclosure.

[0021] Technical Effects

[0022] According to various embodiments of the present disclosure, V2X-related operations and / or sidelink operations may be efficiently enhanced. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] The above and other aspects, features and advantages of certain embodiments of the present disclosure will become more apparent from the following description in conjunction with the accompanying drawings, in which:

[0024] FIG. 1A is a view showing a system according to an embodiment of the present disclosure, FIG. 1B is a view showing a system according to an embodiment of the present disclosure, FIG. 1C is a view showing a system according to an embodiment of the present disclosure, and FIG. 1D is a view showing a system according to an embodiment of the present disclosure;

[0025] 2A is a diagram illustrating a vehicle-to-everything (V2X) communication method performed through a side link according to an embodiment of the present disclosure, and FIG. 2B is a diagram illustrating a V2X communication method performed through a side link according to an embodiment of the present disclosure;

[0026] Figure 3 is a diagram illustrating a resource pool according to an embodiment of the present disclosure, the resource pool being defined as a collection of resources in time and frequency for transmission and reception of a side link;

[0027] Figure 4 is a diagram illustrating a method for allocating transmission resources in a side link by a base station according to an embodiment of the present disclosure;

[0028] Figure 5 is a diagram showing a method for directly allocating transmission resources of a side link by sensing in the side link by a terminal according to an embodiment of the present disclosure;

[0029] Figure 6 is a diagram showing a mapping structure of a physical channel mapped to a time slot in a side link according to an embodiment of the present disclosure;

[0030] Figure 7 is a diagram illustrating a method of selecting and reselecting resources by a terminal in mode 2 according to an embodiment of the present disclosure;

[0031] Figure 8 is a diagram showing a process of dividing one transport block into several code blocks and adding a cyclic redundancy check (CRC) according to an embodiment of the present disclosure;

[0032] 9A, 9B and 9C are diagrams illustrating allocation and indicating one, two or three frequency-time resources according to an embodiment of the present disclosure;

[0033] 10A , 10B, 10C and 10D are diagrams illustrating a method of determining a demodulation reference signal (DMRS) time resource according to various embodiments of the present disclosure;

[0034] 11A , 11B and 11C are diagrams illustrating a method of determining a DMRS time resource according to various embodiments of the present disclosure;

[0035] 12A, 12B, 12C and 12D are diagrams illustrating a method of determining a DMRS time resource according to various embodiments of the present disclosure;

[0036] 13A , 13B, 13C, 13D, 13E, 13F, and 13G are diagrams illustrating a method of determining a DMRS time resource according to various embodiments of the present disclosure;

[0037] 14A , 14B, 14C, 14D and 14E are diagrams illustrating a method of determining a DMRS time resource according to various embodiments of the present disclosure;

[0038] 15A, 15B, 15C and 15D are diagrams illustrating a method of determining a DMRS time resource according to various embodiments of the present disclosure;

[0039] Fig.16 is a diagram illustrating a method for determining DMRS time resources according to an embodiment of the present disclosure;

[0040] Fig.17 is a diagram showing a structure of a terminal according to an embodiment of the present disclosure; and

[0041] Fig.18 is a diagram showing the structure of a base station according to an embodiment of the present disclosure.

[0042] The same reference numerals are used throughout the drawings to denote the same elements. DETAILED DESCRIPTION

[0043] The following description with reference to the accompanying drawings is provided to assist in a comprehensive understanding of the various embodiments of the present disclosure as defined by the claims and their equivalents. It includes various specific details that assist in such understanding, but these are considered to be exemplary only. Accordingly, it will be appreciated by those of ordinary skill in the art that various changes and modifications may be made to the various embodiments described herein without departing from the scope and spirit of the present disclosure. In addition, for the sake of clarity and conciseness, descriptions of well-known functions and structures may be omitted.

[0044] The terms and words used in the following description and claims are not limited to the bibliographic meanings, but are merely used by the inventor to enable a clear and consistent understanding of the present disclosure. Accordingly, it should be apparent to those skilled in the art that the following description of various embodiments of the present disclosure is provided for illustration only and not for limiting the present disclosure as defined by the appended claims and their equivalents.

[0045] It should be understood that the singular forms "a," "an," and "the" include plural referents unless the context clearly dictates otherwise. Thus, for example, reference to "a component surface" includes reference to one or more of such surfaces.

[0046] When describing the embodiments of the present disclosure, descriptions related to technical contents known in the art and not directly related to the present disclosure will be omitted. This omission of unnecessary descriptions is intended to prevent the main idea of ​​the present disclosure from being obscured and to convey the main idea more clearly.

[0047] For the same reason, in the accompanying drawings, some elements may be exaggerated, omitted or schematically shown. In addition, the size of each element does not fully reflect the actual size. In the accompanying drawings, the same or corresponding elements have the same reference numerals.

[0048] By referring to the embodiments described below in conjunction with the accompanying drawings, the advantages and features of the present disclosure and the ways to achieve them will become apparent. However, the present disclosure is not limited to the embodiments set forth below, but can be implemented in various different forms. The following embodiments are provided only to fully disclose the present disclosure and inform those skilled in the art of the scope of the present disclosure, and the present disclosure is limited only by the scope of the attached claims. Throughout the specification, the same or similar reference numerals represent the same or similar elements.

[0049] Here, it will be understood that each block of the flowchart diagram and the combination of blocks in the flowchart diagram can be implemented by computer program instructions. These computer program instructions can be provided to a processor of a general-purpose computer, a special-purpose computer, or other programmable data processing device to produce a machine, so that the instructions executed by the processor of the computer or other programmable data processing device create a component for implementing the function specified in (multiple) flowchart blocks. These computer program instructions can also be stored in a computer-usable or computer-readable memory, which can instruct the computer or other programmable data processing device to operate in a specific manner, so that the instructions stored in the computer-usable or computer-readable memory produce an article including an instruction component, which implements the function specified in (multiple) flowchart blocks. The computer program instructions can also be loaded onto a computer or other programmable data processing device so that a series of operating steps are performed on the computer or other programmable device, thereby generating a computer-implemented process, so that the instructions executed on the computer or other programmable device provide steps for implementing the functions specified in (multiple) flowchart blocks.

[0050] In addition, each block of the flowchart diagram may represent a module, a code segment or a code portion, which includes one or more executable instructions for implementing the specified (multiple) logical functions. It should also be noted that in some alternative implementations, the functions mentioned in the blocks may not occur in order. For example, depending on the functions involved, two blocks shown in succession may actually be executed substantially simultaneously, or these blocks may sometimes be executed in reverse order.

[0051] As used herein, "unit" refers to a software element or hardware element that performs a predetermined function, such as a field programmable gate array (FPGA) or an application specific integrated circuit (ASIC). However, "unit" does not always have the meaning that is limited to software or hardware. "Unit" can be constructed to be stored in an addressable storage medium or to execute one or more processors. Therefore, "unit" includes, for example, software elements, object-oriented software elements, class elements or task elements, processes, functions, attributes, programs, subroutines, program code segments, drivers, firmware, microcodes, circuits, data, databases, data structures, tables, arrays and parameters. The elements and functions provided by "unit" can be combined into less number of elements or "units", or divided into more number of elements or "units". In addition, elements and "units" may be implemented as one or more central processing units (CPUs) in a reproduction device or a secure multimedia card. In addition, "unit" in an embodiment may include one or more processors.

[0052] The following detailed description of the embodiments of the present disclosure is directed to the new RAN (NR) as a radio access network and the packet core (fifth generation (5G) system, 5G core network or next generation core (NG Core)) as a core network, which are specified in the 5G mobile communication standard defined by the Third Generation Partnership Project Long Term Evolution (3GPP LTE) as a mobile communication standardization group, but based on the determination of those skilled in the art, with some modifications, the main ideas of the present disclosure can be applied to other communication systems with similar backgrounds or channel types without significantly deviating from the scope of the present disclosure.

[0053] In the 5G system, in order to support network automation, a network data collection and analysis function (NWDAF) can be defined, which is a network function that provides the function of analyzing and providing data collected from the 5G network. NWDAF can collect / store / analyze information from the 5G network to provide the results to an unspecified network function (NF), and the analysis results can be used independently in each NF.

[0054] In the following description, for ease of description, the present disclosure will be described using terms and names defined in 3GPP standards (5G, NR, LTE or other similar system standards). However, the present disclosure is not limited to these terms and names, and can be applied to systems conforming to other standards in the same manner.

[0055] In addition, in the following description, only for the sake of convenience, terms for identifying access nodes, terms referring to network entities, terms referring to messages, terms referring to interfaces between network entities, terms referring to various identification information, etc. are illustratively used. Therefore, the present disclosure is not limited to the terms used below, and other terms referring to subjects with equivalent technical meanings may be used.

[0056] Unlike the LTE system, the 5G communication system utilizes (resource) various subcarrier spacings such as 30kHz, 60kHz and 120kHz, including 15kHz, the physical control channel uses polarization coding, and the physical data channel uses low-density parity check (LDPC). In addition, as a waveform for uplink transmission, not only DFT-S-OFDM but also CP-OFDM is used. In LTE, although hybrid ARQ (HARQ) retransmission in units of transport blocks (TB) is utilized, in 5G, HARQ retransmission based on code block groups (CBGs) in which several code blocks (CBs) are grouped can be additionally utilized.

[0057] As described above, in a 5G communication system, various services can be provided to users, and in order to provide such various services to users, a method and an apparatus using the method are required to provide each service according to characteristics within the same time period. Various services provided in a 5G communication system are being studied, and one of them is a service that meets the requirements for low latency and high reliability.

[0058] In the case of vehicle communication, the NR vehicle-to-everything (V2X) system supports unicast communication, groupcast (or multicast) communication, and broadcast communication between terminals. In addition, unlike the LTE V2X system, which is intended to send and receive basic safety information required for vehicles to travel on the road, the NR V2X system is intended to provide more advanced services, such as group driving (platooning), advanced driving, extended sensors, and remote driving. In addition, the NR V2X system supports a method in which the terminal directly detects and allocates side link transmission resources based on periodic and non-periodic services. However, in particular in the case of pedestrian mobile terminals, methods and processes for selecting transmission resources by minimizing the power consumption of the terminal may be required. Therefore, the operation of the terminal and the base station for solving this problem should be defined. However, no discussion has been made on this point. Accordingly, the present disclosure proposes a sensing and resource allocation method for optimizing the power consumption of the terminal in the side link. In addition, the present disclosure also proposes a DMRS transmission / reception method for such side link data.

[0059] Embodiments have been proposed to support the above-mentioned scenarios, and in particular, an object of the present disclosure is to provide a method and apparatus for minimizing power consumption of a terminal during a sensing and resource selection process of the terminal in a side link.

[0060] Figure 1A is a view showing a system according to an embodiment of the present disclosure, Figure 1B is a view showing a system according to an embodiment of the present disclosure, Figure 1C is a view showing a system according to an embodiment of the present disclosure, and Figure 1D is a view showing a system according to an embodiment of the present disclosure.

[0061] Referring to Figures 1A to 1D, Figure 1A shows a situation in which all V2X terminals UE1 and UE2 are located within the coverage area of ​​the base station (in-coverage (IC)). All V2X terminals can receive data and control information from the base station via a downlink (DL), or send data and control information to the base station via an uplink (UL). In this case, the data and control information may be data and control information for V2X communication. The data and control information may be data and control information for general cellular communication. In addition, the V2X terminal may send / receive data and control information for V2X communication via a side link (SL).

[0062] Referring to Figures 1A to 1D, Figure 1B shows a situation in which UE-1 among the V2X terminals is located within the coverage area of ​​the base station and UE-2 is located outside the coverage area of ​​the base station. For example, Figure 1B shows partial coverage (PC) in which some V2X terminals (UE-2) are located outside the coverage area of ​​the base station. The V2X terminal UE-1 located within the coverage area of ​​the base station can receive data and control information from the base station via a downlink, or send data and control information to the base station via an uplink. The V2X terminal UE-2 located outside the coverage area of ​​the base station cannot receive data and control information from the base station via a downlink, nor can it send data and control information to the base station via an uplink. Accordingly, the V2X terminal UE-2 can send / receive data and control information for V2X communication via a side link with the V2X terminal UE-1.

[0063] Referring to FIG. 1A to FIG. 1D , FIG. 1C shows a situation in which all V2X terminals are located outside the coverage area (out of coverage, OOC) of the base station. Therefore, the V2X terminals UE-1 and UE-2 cannot receive data and control information from the base station through the downlink, nor can they send data and control information to the base station through the uplink. The V2X terminals UE-1 and UE-2 can send / receive data and control information for V2X communication through the side link.

[0064] Referring to Figures 1A to 1D, Figure 1D shows a scenario for performing V2X communication between V2X terminals UE1 and UE2 located in different cells. Specifically, Figure 1D shows a situation where V2X terminals UE1 and UE2 are connected to different base stations (RRC connection state) or reside (RRC connection release state, i.e., RRC idle state). In this case, the V2X terminal UE-1 can be a V2X transmitting terminal, and the V2X terminal UE-2 can be a V2X receiving terminal. Alternatively, the V2X terminal UE-1 can be a V2X receiving terminal, and the V2X terminal UE-2 can be a V2X transmitting terminal. The V2X terminal UE-1 can receive a system information block (SIB) from a base station to which it has accessed (or resided), and the V2X terminal UE-2 can receive a SIB from another base station to which it is connected (or resided). In this case, as the SIB, an existing SIB can be used, or a separately defined SIB for V2X can be used. In addition, the information of the SIB received by the V2X terminal UE-1 and the information of the SIB received by the V2X terminal UE-2 may be different from each other. Therefore, in order to perform V2X communication between the terminals UE-1 and UE-2 located in different cells, a method of interpreting the SIB information transmitted from different cells by unifying the information or by signaling the information may be additionally required.

[0065] In FIG. 1A to FIG. 1D, for the convenience of description, a V2X system composed of V2X terminals UE-1 and UE-2 is shown, but the present disclosure is not limited thereto, and communication between more V2X terminals can be realized. In addition, the interface (uplink and downlink) between the base station and the V2X terminal can be referred to as a Uu interface, and the side link between the V2X terminals can be referred to as a PC5 interface. Therefore, in the present disclosure, these terms can be used in a mixed manner. At the same time, in the present disclosure, the terminal may include a vehicle supporting vehicle-to-vehicle communication (vehicular-to-vehicular, V2V)), a vehicle supporting vehicle-to-pedestrian communication (vehicular-to-pedestrian, V2P) or a pedestrian mobile phone (e.g., a smart phone), a vehicle supporting communication between networks (vehicular-to-network, V2N)), or a vehicle supporting communication between a vehicle and a traffic infrastructure (vehicular-to-infrastructure, V2I). In addition, in the present disclosure, the terminal may include a road side unit (RSU) equipped with a terminal function, an RSU equipped with a base station function, or an RSU equipped with part of a base station function and part of a terminal function.

[0066] In addition, according to an embodiment of the present disclosure, the base station may be a base station that supports both V2X communication and general cellular communication, or may be a base station that supports only V2X communication. In this case, the base station may be a 5G base station (gNB), a 4G base station (eNB), or an RSU. Therefore, in the present disclosure, the base station may be referred to as an RSU.

[0067] FIG. 2A is a diagram illustrating a V2X communication method performed through a side link according to an embodiment of the present disclosure, and FIG. 2B is a diagram illustrating a V2X communication method performed through a side link according to an embodiment of the present disclosure.

[0068] 2A , UE- 1 201 (eg, a TX terminal) and UE- 2 202 (eg, a RX terminal) may perform one-to-one communication, and it may be referred to as unicast communication.

[0069] With reference to Figure 2B, TX terminal and RX terminal can perform one-to-many communication, and one-to-many communication can be referred to as groupcast or multicast. In Figure 2B, UE-1 211, UE-2 212 and UE-3 213 can form a group (group A) to perform groupcast communication, and UE-4 214, UE-5 215, UE-6 216 and UE-7 217 can form another group (group B) to perform groupcast communication. Each terminal performs multicast communication only in the group to which it belongs, and communication between different groups can be performed by unicast, multicast or broadcast communication. Figure 2B shows that two groups (group A and group B) are formed, but is not limited thereto.

[0070] Meanwhile, although not shown in FIG. 2A and FIG. 2B , the V2X terminal may perform broadcast communication. Broadcast communication refers to a situation where all V2X terminals receive data and control information transmitted by a V2X transmitting terminal through a side link. As an example, if it is assumed that UE-1 211 is a transmitting terminal for broadcasting in FIG. 2B , all terminals UE-2 212 , UE-3 213 , UE-4 214 , UE-5 215 , UE-6 216 , and UE-7 217 may receive data and control information transmitted by UE-1 211 .

[0071] In NR V2X, unlike in LTE V2X, it is possible to consider supporting a form in which a vehicle terminal sends data to only one specific node by unicast and a form in which data is sent to multiple specific nodes by multicast. For example, in a service scenario such as platooning (a technology that connects two or more vehicles through a single network and moves in a cluster), such unicast and multicast technologies can be effectively used. Specifically, in order for a group leader node connected by a platoon to control a specific node, unicast communication may be required, and in order to simultaneously control a group consisting of a specific number of nodes, multicast communication may be required.

[0072] Figure 3 is a diagram illustrating a resource pool according to an embodiment of the present disclosure, where the resource pool is defined as a collection of resources in time and frequency for transmission and reception of a side link.

[0073] In a resource pool, the resource granularity on the time axis may be a time slot. In addition, the resource allocation unit on the frequency axis may be a subchannel including one or more physical resource blocks (PRBs).

[0074] When the resource pool is allocated in time and frequency (310), the colored area indicates the area set as the resource pool in time and frequency. In the present disclosure, an example of a case where the resource pool is allocated non-continuously over time is described, but the resource pool may be allocated continuously over time. In addition, although the present disclosure describes an example in which the resource pool is allocated continuously in frequency, a method in which the resource pool is allocated non-continuously in frequency is not excluded.

[0075] refer to Figure 3 , showing a situation 320 where resource pools are allocated non-contiguously over time. Figure 3 , shows a case where the granularity of resource allocation is composed of time slots in time. Specifically, a time slot including multiple OFDM symbols can be the basic unit of resource allocation on the time axis. In this case, all OFDM symbols constituting the time slot can be used for side link transmission, or some of the OFDM symbols constituting the time slot can be used for side link transmission. For example, some of the time slots can be used as downlink / uplink, which is used as a Uu interface between base station terminals. Reference Figure 3 , colored time slots represent time slots included in the resource pool in time, and time slots allocated to the resource pool may be (pre) configured with resource pool information in time. For example, the resource pool information in time may be indicated as a bitmap through the SIB.

[0076] refer to Figure 3, physical time slots 320 belonging to a resource pool that is non-contiguous in time may be mapped to a logical time slot 321. In general, a set of time slots belonging to a physical sidelink shared channel (PSSCH) resource pool may be represented by (t0, t1, ..., ti, ..., tTmax).

[0077] refer to Figure 3 , showing a situation 330 where resource pools are allocated consecutively in frequency.

[0078] Resource allocation on the frequency axis may be performed in units of subchannels 331. A subchannel 331 may be defined as a resource allocation unit on a frequency including one or more RBs. For example, a subchannel 331 may be defined as an integer number of RBs. Figure 3 , subchannels 3-31 may include five consecutive PRBs, and the size of the subchannel (sizeSubchannel) may be the size of five consecutive PRBs. However, what is shown in the accompanying drawings is only an example of the present disclosure, and the size of the subchannel may be configured differently, and one subchannel is generally configured as consecutive PRBs, but it is not necessarily configured as consecutive PRBs. Subchannel 331 may be a basic unit of resource allocation for PSSCH.

[0079] startRB-Subchannel 332 may indicate the starting position of the subchannel 331 in the frequency in the resource pool. When resource allocation is performed in units of subchannels 331 on the frequency axis, resources on the frequency may be allocated through configuration information about the RB index (startRB-Subchannel 332) at which the subchannel 331 starts, information about how many RBs the subchannel 331 consists of (sizeSubchannel), the total number of subchannels 331 (numSubchannel), and the like. In this case, information about startRB-Subchannel, sizeSubchannel, and numSubchannel may be (pre-)configured as resource pool information on the frequency. For example, the frequency resource pool information may be configured and indicated through the SIB.

[0080] Figure 4 is a diagram illustrating a method for allocating transmission resources in a side link by a base station according to an embodiment of the present disclosure.

[0081] The method by which the base station allocates transmission resources in the side link will be referred to as Mode 1 below. Mode 1 may be a scheduled resource allocation. Mode 1 may represent a method in which the base station allocates resources for side link transmission to the RRC-connected terminal in a dedicated scheduling scheme. The Mode 1 method may be effective for interference management and resource pool management because the base station can manage the resources of the side link.

[0082] refer to Figure 4 , the transmitting terminal 401 and the receiving terminal 402 residing (405) may receive a sidelink system information block (SL-SIB) (410) from the base station 403. Here, the receiving terminal 402 indicates a terminal that receives data transmitted by the transmitting terminal 401. The SL-SIB information may include sidelink resource pool information for sidelink transmission / reception, parameter setting information for sensing operation, information for setting sidelink synchronization, or carrier information for sidelink transmission / reception operating at different frequencies.

[0083] When a data service for V2X is generated in the transmitting terminal 401, the transmitting terminal 401 may be an RRC (420) connected to the base station 403. Here, the RRC connection between the terminal and the base station may be referred to as Uu-RRC. The Uu-RRC connection process 420 may be performed before the transmitting terminal 401 generates data services. In addition, in mode 1, while the Uu-RRC connection process 420 between the base station 403 and the receiving terminal 402 is being performed, the transmitting terminal may perform transmission to the receiving terminal through a side link. On the contrary, in mode 1, even when the Uu-RRC connection process 420 between the base station 403 and the receiving terminal 402 is not being performed, the transmitting terminal may perform transmission to the receiving terminal through a side link.

[0084] The transmitting terminal 401 may request transmission resources (430) that enable V2X communication with the receiving terminal 402 from the base station. In this case, the transmitting terminal 401 may request the sidelink transmission resources from the base station 403 using an uplink physical uplink control channel (PUCCH), an RRC message, or a MAC CE. At the same time, the MAC CE may be a buffer status report (BSR) MAC CE of a new format (including at least an indicator indicating a buffer status report for V2X communication and information about the size of data buffered for D2D communication). In addition, the transmitting terminal 401 may request sidelink resources through a scheduling request (SR) bit transmitted via an uplink physical control channel.

[0085] Thereafter, the base station 403 may allocate V2X transmission resources to the transmitting terminal 401. In this case, the base station may allocate transmission resources in a dynamic authorization scheme or a configured authorization scheme.

[0086] First, in the case of a dynamic grant scheme, the base station can allocate resources for TB transmission through downlink control information (DCI). The sidelink scheduling information included in the DCI may include parameters related to the initial transmission and retransmission transmission time and the frequency allocation location information field. The DCI for the dynamic grant method can be scrambled with a cyclic redundancy check (CRC) with the SL-V-Radio Network Temporary Identifier (RNTI) to indicate that it is a dynamic grant scheme.

[0087] Thereafter, in the case of configuring the grant scheme, the base station can periodically allocate resources for TB transmission by configuring the semi-persistent scheduling (SPS) interval via Uu-RRC. In this case, the base station can allocate resources for one TB through DCI. The sidelink scheduling information for one TB included in the DCI may include parameters related to the initial transmission and retransmission resource transmission time and frequency allocation location information. When resources are allocated with a configured grant scheme, the transmission time (timing) and frequency allocation location for the initial transmission and retransmission of one TB can be determined by DCI, and the resources for the next TB can be repeated at intervals of the SPS interval. The DCI for configuring the grant scheme can be CRC-encrypted with SL-SPS-V-RNTI to indicate the configured grant scheme. In addition, the configured grant (CG) scheme can be divided into type 1CG and type 2CG. In the case of type 2CG, the resources set to the configured grant can be activated / deactivated by DCI.

[0088] Therefore, in the case of Mode 1, the base station 403 may instruct the transmitting terminal 401 to schedule the sidelink communication with the receiving terminal 402 by DCI transmission via the PDCCH (440).

[0089] In the case of broadcast transmission, the transmitting terminal 401 may broadcast SCI to the receiving terminal 402 through the PSCCH by broadcasting (first phase), without the need for the RRC configuration 415 (460) for the side link. In addition, the transmitting terminal 401 may broadcast data to the receiving terminal 402 through the PSSCH (480). In the case of broadcast transmission, SCI transmission through the PSSCH may not be performed (second phase SCI 470).

[0090] On the contrary, in the case of unicast or multicast transmission, the transmitting terminal 401 can perform a one-to-one RRC connection with another terminal. Here, the RRC connection between the terminals can be referred to as PC5-RRC 415 to distinguish it from Uu-RRC. Even in the case of multicast, PC5-RRC 415 can be connected individually between the terminal and the terminals in the group. Figure 4, although the connection of PC5-RRC 415 is shown as an operation after the transmission 410 of SL-SIB, it can be performed at any time before the transmission 410 of SL-SIB or the transmission of SCI. If an RRC connection between terminals is required, a PC5-RRC connection of the side link can be performed, and the transmitting terminal 401 can send SCI to the receiving terminal 402 via PSCCH in a unicast or multicast manner (first phase) (460). In this case, the multicast transmission of SCI can be interpreted as group SCI. In addition, the transmitting terminal 401 can send SCI to the receiving terminal 402 via PSSCH in a unicast or multicast manner (second phase) (470). In this case, information related to resource allocation can be included in the first phase SCI, and control information other than this can be included in the second phase SCI. In addition, the transmitting terminal 401 can send data to the receiving terminal 402 via PSSCH in a unicast or multicast manner (480).

[0091] Figure 5 1 is a diagram showing a method for directly allocating transmission resources of a side link by sensing in the side link by a terminal according to an embodiment of the present disclosure. Hereinafter, a method in which a UE directly allocates side link transmission resources by sensing in the side link is referred to as Mode 2. In the case of Mode 2, it may also be referred to as UE autonomous resource selection.

[0092] refer to Figure 5 In mode 2, the base station 503 can provide a pool of sidelink transmission / reception resources for V2X as system information, and the transmitting terminal 501 can select transmission resources according to a predetermined rule. Different from mode 1 in which the base station is directly involved in resource allocation, in Figure 5 The difference is that the transmitting terminal 501 autonomously selects resources and sends data based on the resource pool previously received through system information.

[0093] refer to Figure 5 , a transmitting terminal 501 and a receiving terminal 502 residing (505) may receive SL-SIB (510) from a base station 503. Here, the receiving terminal 502 indicates a terminal that receives data transmitted by the transmitting terminal 501. The SL-SIB information may include side link resource pool information for side link transmission / reception, parameter configuration information for sensing operation, information for configuring side link synchronization, or carrier information for operating side link transmission / reception at different frequencies.

[0094] Figure 4 and Figure 5 The difference between Figure 4 In the case of, the base station 503 and the terminal 501 operate in the RRC connected state, and Figure 5In the RRC connection state 520, the terminal can operate in an idle mode (a state in which RRC is not connected) 520. In addition, even in the RRC connection state 520, the base station 503 does not directly participate in resource allocation, and allows the transmitting terminal 501 to autonomously select transmission resources. Here, the RRC connection between the terminal 501 and the base station 503 can be referred to as Uu-RRC (520). When a data service for V2X is generated in the transmitting terminal 501, the transmitting terminal 501 can be configured with a resource pool through system information received from the base station 503, and the transmitting terminal 501 can directly select resources in the time / frequency domain by sensing within the configured resource pool (530).

[0095] In the case of broadcast transmission, the transmitting terminal 501 may broadcast SCI (first phase) (550) to the receiving terminal 502 via the PSCCH by broadcasting without configuring (520) the RRC for the side link. In addition, the transmitting terminal 501 may broadcast data (570) to the receiving terminal 502 via the PSSCH. In the case of broadcast transmission, SCI transmission (second phase SCI 560) via the PSSCH may not be performed.

[0096] On the contrary, in the case of unicast and multicast transmission, the transmitting terminal 501 can perform a one-to-one RRC connection with other terminals. Here, separate from Uu-RRC, the RRC connection between terminals can be PC5-RRC. Even in the case of multicast, PC5-RRC can be connected separately between terminals in the group. Figure 5 In the figure, the connection of PC5-RRC 515 is shown as an operation after the transmission 510 of SL-SIB, but can be performed at any time before the transmission 510 of SL-SIB or the transmission 550 of SCI. If an RRC connection between terminals is required, a side link PC5-RRC connection (515) can be performed, and the transmitting terminal 501 can send SCI (first stage) (550) to the receiving terminal 502 via PSCCH in a unicast or multicast manner. In this case, the multicast transmission of SCI can be interpreted as a group SCI. In addition, the transmitting terminal 501 can send SCI (second stage) (560) to the receiving terminal 502 via PSSCH in a unicast or multicast manner. In this case, information related to resource allocation can be included in the first stage SCI, and control information other than this can be included in the second stage SCI. In addition, the transmitting terminal 501 can send data (570) to the receiving terminal 502 via PSSCH in a unicast or multicast manner.

[0097] Figure 6 is a diagram showing a mapping structure of physical channels mapped to one time slot in a side link according to an embodiment of the present disclosure.

[0098] refer to Figure 6 , shows the mapping of PSCCH / PSSCH / PSFCH physical channels. PSCCH / PSSCH / PSFCH can be allocated to one or more subchannels in the frequency domain. For details of subchannel allocation, refer to Figure 3 Hereafter, refer to Figure 6 To describe the time mapping of PSCCH / PSSCH / PSFCH, one or more symbols before the transmitting terminal sends PSCCH / PSSCH / PSFCH in the corresponding time slot 601 can be used as an area 602 for AGC. When the corresponding (multiple) symbols are used for AGC, the method of repeating and transmitting the signals of other channels in the corresponding symbol area 602 can be considered. In this case, a part of the PSCCH symbol or the PSSCH symbol can be considered for the repeated signal of another channel. Alternatively, the preamble can be sent to the AGC area 602. When the preamble signal is sent, the advantage is that the AGC execution time can be shorter than the method of repeatedly sending the signals of other channels. When the preamble signal is sent for AGC, a specific sequence can be used as the preamble signal 602, and in this case, sequences such as PSSCH DMRS, PSCCH DMRS and CSI-RS can be used as preambles. The sequence used as the preamble in the present disclosure is not limited to the above examples.

[0099] In addition, according to Figure 6 , PSCCH 603 including control information may be transmitted in the initial symbol of the time slot, and data scheduled by the control information of PSCCH 603 may be transmitted to PSSCH 604. A part of the sidelink control information (SCI) as the control information (first phase SCI) may be mapped to PSCCH 603 and transmitted. In PSSCH 604, not only data information but also another part of the SCI as the control information (second phase SCI) may be mapped and transmitted. In addition, Figure 6 It is shown that the physical side link feedback channel (PSFCH 605) is located at the end of the time slot, and the PSFCH is a physical channel for transmitting feedback information. A predetermined idle time (gap) can be ensured between the PSSCH 604 and the PSFCH 605 so that the UE that has transmitted / received the PSSCH 604 can prepare to transmit or receive the PSFCH 605. In addition, after transmitting and receiving the PSFCH 605, an empty interval (gap) of a predetermined time can be ensured.

[0100] Figure 7 is a diagram illustrating a method of selecting and reselecting resources by a terminal in Mode 2 according to an embodiment of the present disclosure.

[0101] refer to Figure 7 , which shows a case where a trigger for resource selection is performed at time n, and a trigger for re-evaluation is performed at n' (n'>n) by continuously sensing even after the trigger time n. Figure 7 , when a trigger for resource selection is performed at time n, the sensing window may be defined as [n-T0, n-Tproc, 0]. Here, T0 is the starting point of the sensing window and may be (pre-) configured as resource pool information. In addition, Tproc, 0 may be defined as the time required to process the sensing result, and the required Tproc, 0 may vary according to the configured T0 value. Specifically, when a long T0 value is configured, a long Tproc, 0 may be required. Conversely, when a short T0 value is configured, a short Tproc, 0 may be required. Accordingly, the Tproc, 0 value may be fixed to one value, but another value adjusted by the configured T0 value may be (pre-) configured as resource pool information. Thereafter, when a trigger for resource selection is performed at time n, the resource selection window may be determined as [n+T1, n+T2]. Here, for T1≤Tproc, 1, T1 may be selected as a terminal implementation. Tproc,1 is a maximum reference value in which the processing time required to select resources is taken into account, and since the processing time may vary according to the terminal implementation, T1 may be selected by the terminal implementation to be a value less than Tproc,1. In addition, it is assumed that T2 is configured to select Nmax resources for one TB, and the Nmax resources may include initial transmission resources and retransmission resources. In this case, the UE selects T2 within the range that satisfies T2 ≤ packet delay budget (PDP). Thereafter, reference Figure 7 , when a trigger for re-evaluation occurs at n' (n'>n) by continuously performing sensing even after the trigger, this means that when at least the already selected resource is in time slot m (701), the trigger for reselection should be performed before m-T3. Here, T3 may be the processing time required for reselection. As a first method, a method of using the resource selection processing time T1 that has been selected according to the UE implementation as T3 as it is may be considered (T3=T1). However, in the re-evaluation process, additional processing time for resource selection may be required. Specifically, the time required to discard the previously selected resource and the time required to process it in the case where the previous resource and the new resource overlap may be required. Therefore, a method of configuring T3=Tproc,1 may be considered. This is because Tproc,1 is a maximum reference value in which the processing time required to select a resource is taken into account, so if the trigger for reselection is performed before the corresponding value, it is possible that the selected resource can be changed to another resource. As Figure 7As shown, when the trigger for re-evaluation occurs at n' (n'>n), the sensing window for this may be [n'-T0, n'-Tproc,0], and the resource selection window for this may be determined as [n'+T1, n'+T2]. In this case, the values ​​of T0 and Tproc,0 may be the same values ​​as those used when the trigger for resource selection is performed at time n. However, for T1 and T2, depending on the implementation, the terminal may select the same values ​​as at point n when the trigger for resource selection is performed, but may also select other values.

[0102] Figure 8 is a diagram showing a process in which one transport block is divided into several code blocks and a CRC is added according to an embodiment of the present disclosure.

[0103] refer to Figure 8 , CRC8-03 can be added to the last or first part of a transport block 8-01 to be sent in the uplink or downlink. CRC can have 16 bits or 24 bits, a predetermined number of bits or a variable number of bits according to channel conditions, and can be used to determine whether channel coding is successful. Blocks 8-01 and 8-03 (for which CRC is added to TB) can be divided into several code blocks (CB) 8-07, 8-09, 8-11 and 8-13 (8-05). The maximum size of the code block can be determined and can be divided accordingly. In this case, the last code block 8-13 can be smaller than the other code blocks in size, or can be adjusted to have the same length as other code blocks by inserting 0, random values ​​or 1. CRC8-17, 8-19, 8-21 and 8-23 can be added to the divided code blocks (8-15). CRC can have 16 bits, 24 bits or a predetermined number of bits, and can be used to determine whether channel coding is successful.

[0104] To generate CRC8-03, TB8-01 and a cyclic generator polynomial may be used, and the cyclic generator polynomial may be defined in various ways. For example, assuming that for a 24-bit CRC, the cyclic generator polynomial g CRC24A (D)=[D 24 +D 23 +D 18 +D 17 +D 14 +D 11 +D 10 +D 7 +D 6 +D 5 +D 4 +D 3 +D+1], and assuming L=24, for TB data a 0 , a 1, a 2 , a 3 , ..., a A-1 , CRCp 0 , p 1 , p 2 , p 3 , ..., p L-1 , use g CRC24A (D) to remove a 0 D A+23 +a 1 D A+22 +...+a A-1 D 24 +p 0 D 23 +p 1 D 22 +...+p 22 D 1 +p 23 , to determine p 0 , p 1 , p 2 , p 3 , ..., p L-1 As a value where the remainder is 0. An example in which the CRC length L is 24 has been described above, but the length may be determined in various lengths such as 12, 16, 24, 32, 40, 48, 64, and the like.

[0105] After CRC is added to TB by the above process, the transmitter divides it into N CBs 8-07, 8-09, 8-11, 8-13 (8-05). CRC 8-17, 8-19, 8-21, 8-23 are added to each of the divided CBs 8-07, 8-09, 8-11 and 8-13 (8-15). As for the CRC added to the CB, a CRC of a different length or a different cyclic generator polynomial can be used when generating the CRC added to the TB. However, depending on the type of channel code to be applied to the code block, the CRC 803 added to the TB and the CRC 8-17, 8-19, 8-21 and 8-23 added to the code block can be omitted. For example, when a low-density parity check (LDPC) code instead of a turbo code is applied to the code block, the CRC 8-17, 8-19, 8-21 and 8-23 to be inserted for each code block can be omitted. However, even when LDPC is applied, CRC 8-17, 8-19, 8-21, and 8-23 may be added to the code block as is. In addition, even when polar codes are used, CRC may be added or omitted.

[0106] As above Figure 8As described above, as for a TB to be transmitted, a maximum length of one code block may be determined according to a type of channel coding applied, and the TB and a CRC added to the TB may be divided into code blocks depending on the maximum length of the code block.

[0107] In the related art LTE system, a CRC for a CB is added to the divided CB, data bits and the CRC of the CB are encoded with a channel code, coded bits are determined, and the number of rate matching bits can be determined for each coded bit as promised in advance.

[0108] The following embodiment will propose a method for minimizing the power consumption of a terminal in the process (mode 2) of the terminal performing sensing and resource selection in the above-mentioned side link. This embodiment relates to the operation of the terminal and the base station according to the proposed method.

[0109] First embodiment

[0110] The first embodiment provides a method and apparatus for allocating frequency-time resources to a receiving terminal in a process in which the terminal performs sensing and resource selection and transmits data in a side link.

[0111] Information for allocating up to Nmax frequency-time resources can be sent by the transmitting terminal to the receiving terminal in the side link control information. Nmax can be a configuration value, and for example, can be set to 2 or 3. For example, when Nmax is configured to 3, up to 3 resource allocation information can be transmitted in the SCI. Of course, when Nmax is configured to 3, only one resource allocation information can be transmitted, or only two resource allocation information can be transmitted, or three resource allocation information can be transmitted. The range of frequency-time resources that can be allocated above can be given by W. For example, the time range of the allocated resources indicated by the SCI can be W. W can be given as the number of time slots. For example, W can be given as 32, which can transmit Nmax resource allocation information in 32 time slots in the SCI.

[0112] Fig. 9A, Fig. 9B and Fig. 9C are diagrams showing the allocation and indication of one, two or three frequency-time resources according to an embodiment of the present disclosure. The allocation of frequency-time resources can be applied by combining one or more of the following methods. In the following, it can be a method of separately indicating frequency resources and time resources. In the following, it is described as an example of a situation where W=32 (i.e., a time resource selection range of 32 time slots) and the size of the resource allocation bit field required in the SCI can be changed and applied when W is changed and applied.

[0113] -Time resource allocation method 1: This method provides an example when Nmax=2 is configured. A 5-bit bit field is used for time resource allocation, and when the value indicated by the 5 bits is T, the first resource is a resource allocated in the time slot (e.g., time slot n) in which the SCI is transmitted, and the second resource is a resource allocated in n+T. In this method, T may be a value obtained by converting the 5-bit indication value into a decimal number. If the value indicated by the 5 bits is 0, that is, T=0, the second resource may be considered to be not allocated. If T=0, the second frequency resource information indicated in the same SCI may be ignored. Alternatively, if T=0, the second frequency resource information indicated in the same SCI may be a value used for another purpose.

[0114] -Time resource allocation method 2: This method provides an example when Nmax=3 is configured. Two 5-bit bit fields are used for time resource allocation, and when the value indicated by each of the 5 bits of each bit field is T1 and T2, the first resource is allocated in the time slot (time slot n) in which the SCI is transmitted. The second resource is a resource allocated from n+T1, and the third resource is a resource allocated from n+T2. In the above, the order of the second resource and the third resource may be changed according to the values ​​of T1 and T2. In this method, T1 and T2 may be values ​​obtained by converting the values ​​indicated in the 5-bit bit field into decimal numbers. If the value indicated by the 5 bits in the above bit field is 0, that is, T1=0 or T2=0, the second resource or the third resource may be regarded as not allocated. In addition, if T1=0 and T2=0, the second resource and the third resource may be regarded as unallocated, and in this case, the TB may be sent only in the time slot in which the SCI is transmitted. If T1=0 or T2=0, the second or third frequency resource information indicated in the same SCI may be ignored. In this method, if only two resources are to be allocated, forcing T2=0 may be applied and T1 indicates the second resource. In this case, the time position of the first resource will be T0=0. Conversely, in this method, if only two resources are to be allocated, forcing T1=0 may be applied and T2 indicates the second resource. In this case, the time position of the first resource will be T0=0.

[0115] -Time resource allocation method 3: This method provides an example when Nmax=3 is configured. One bit field is used for time resource allocation, and T1 and T2 can be interpreted by the bit field value. When the bit field value is r, r can be determined by the following equation 1.

[0116] [Equation 1]

[0117]

[0118] In the above formula, N is the number of resources allocated by SCI, and may be N=0 or N=1 or N=2. In the above, W is the time range in which resources can be selected as described above. In the above formula, Ti refers to the time slot of the i-th resource, and in the present disclosure, T0 refers to T0=0 as the first resource, and T1 and T2 respectively indicate the time slot information of the second resource and the third resource, and may be time slots offset from the first resource.

[0119] In the equation, Is The extended binomial operation defined, and It can represent the number of cases where y is subtracted from x and can be a binary coefficient. According to Equation 1, the value of r is determined within the range of Equation 2 below.

[0120] [Equation 2]

[0121]

[0122] Accordingly, compared with the time resource allocation method 2, the number of bits used to indicate T1 and T2 can be saved, and the size of the bit field applied in this method can be determined as bits. On top, It can be a value rounded up from x, or it can indicate the smallest integer greater than or equal to x.

[0123] Referring to FIG. 9A , as an example, consider a case where W=32 and Nmax=3. In this case, it is necessary bits to apply this method. When only one frequency-time resource is allocated, that is, when N=1, Equation 1 can be applied to the following Equation 3.

[0124] [Equation 3]

[0125] r=0

[0126] For example, T0=0, and T1 and T2 are not set and thus can be ignored.

[0127] 9B , when only two frequency-time resources are allocated, ie, when N=2, Equation 3 may be applied to the following Equation 4.

[0128] [Equation 4]

[0129]

[0130] That is, assuming that T0=0, as shown in Table 1 below, r is determined according to the value of T1, and the value of T2 is not determined and is thus negligible.

[0131] [Table 1]

[0132] T1 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 r 31 30 29 28 27 26 25 24 23 22 21 20 19 18 17 16 15 14 13 12 11 10 9 8 7 6 5 4 3 2 1

[0133] 9C , when three frequency-time resources are allocated, ie, when N=3, Equation 1 may be applied to the following Equation 5.

[0134] [Equation 5]

[0135]

[0136] That is, assuming T0=0, r is determined according to the values ​​of T1 and T2 as shown in Table 2 below.

[0137] [Table 2]

[0138]

[0139] That is, given r, one can find information about T1 and T2.

[0140] -Time resource allocation method 4: This method provides an example when Nmax=3 is configured. One bit field is used for time resource allocation, and T1 and T2 can be interpreted by the bit field value. When the bit field value is r, r can be determined by the following method. In this case, N can be one of the values ​​1 to 3, and when N is 1, r can have a specific value. As an example, r can be determined to be 0. In this case, the time resource allocation may indicate that only the first resource indicating T0=0 is allocated. As another embodiment of the present disclosure, when N is 1, only the first resource is allocated, and the values ​​of T1 and T2 can both be 0. In this case, even when N is 1, the following equation can be used.

[0141] When N is greater than 1, r can be determined by the following Equation 6.

[0142] [Equation 6]

[0143] if So

[0144] r=W×T 2 +T 1

[0145] otherwise

[0146] r=W(WT 2 )+(WT 1 )+1

[0147] In the above formula, N is the number of resources allocated by SCI, and may be N=2 or N=3. In the above, W may be a value related to the time range in which resources may be selected as described above. For example, W may be the number of time ranges in which resources may be selected, a value less than 1, or a value greater than 1. It can be a value rounded down from x, or it can indicate the maximum integer less than or equal to x. In the above, T1 and indicate the time slot information of the second resource and the third resource respectively, and can be the time slot offset from the first resource or the second resource. For example, T1 is the time offset from the first resource, and T2 is the time offset from the second resource. In this case, T0 may mean T0=0 as the first resource. T1 can have a value greater than or equal to 1, and T2 can have a value greater than or equal to 0. When T2 is 0, it may indicate that the third resource is not allocated. In other words, when N=2, the value of T2 can be 0, and when N=3, both T1 and T2 can be integers greater than 0. In other words, when N=3, both T1 and T2 can be integers greater than or equal to 1. The size of the bit field applied in this method can be determined by bits to determine. In the above, It may be a value rounded up from x, or may indicate the smallest integer greater than or equal to x. In order to allocate resources, the transmitter may transmit the r value after allocating resources according to the method, and the receiver may check the allocated resources after receiving r through the method.

[0148] -Time resource allocation method 5: In this method, another example is provided when Nmax=3 is configured. One bit field is used for time resource allocation, and T1 and T2 can be interpreted by the bit field value. When the bit field value is r, r can be determined as T1 and T2, as shown in Table 3 below.

[0149] [Table 3]

[0150]

[0151] In Table 3 above, Ti refers to the time slot of the i-th resource, and in the present disclosure, T0 refers to T0=0 as the first resource, when T1>0, T1 and T2 refer to the time slot information of the second resource and the third resource respectively, and when T1=0, T2 refers to the time slot information of the second resource, and is the time slot offset from the first resource.

[0152] As an example, consider the case where W = 32 and Nmax = 3. In this case, it is necessary bits to apply this method.

[0153] Second embodiment

[0154] The second embodiment provides a method and apparatus for applying a location for transmitting / receiving a demodulation reference signal (DMRS) for data transmission (ie, PSSCH transmission) in sidelink communication.

[0155] In a wireless communication system, while a terminal receives a signal, it may be necessary to amplify the strength of the signal. To this end, signal processing is performed after the received signal passes through an amplifier to amplify the strength of the signal, and an amplifier capable of changing the amplification degree of the signal can be used. Each amplifier may have a range of input or output with linearity between input and output. If amplification is performed by increasing the amplification degree too high, the output may be determined to be within a range outside the linearity, and therefore the received signal may be deformed, and this deformation may deteriorate the receiving performance. Therefore, in order to ensure performance, the amplification degree should be operated within a linear interval between the input and output of the amplifier. In addition, if the amplification degree is set too low, the receiving performance may not be ensured because the amplification of the received signal is not fully amplified. Therefore, the amplification degree can be continuously and automatically adjusted so as to amplify as much as possible in a linear interval between the input and output of the amplifier, which is called automatic gain control (AGC). The terminal can perform AGC to find a suitable amplification degree, and it takes some time to find a suitable amplification degree, and this required time is called AGC training time. The signal received during the AGC training time may not be used for actual control and data signal reception, and the AGC training time may be determined according to the initial value of the amplification degree configured for performing AGC. In a side link communication where the terminal to which the signal is sent may continuously change, the receiving terminal should continuously perform AGC, and therefore the AGC time may be required for each signal reception. As described above, as the AGC training time required by the receiving terminal is reduced, the interval of the received signal that the terminal can use for signal processing increases, so that the reception performance can be improved.

[0156] The transmitting terminal may send a preamble signal in one or more symbols before sending the side link control channel and data. The preamble signal may be used to enable the receiving terminal to correctly perform automatic gain control (AGC) to adjust the strength of amplification when amplifying the power of the received signal. The PSCCH including control information is sent in the initial symbol of the time slot, and the PSSCH scheduled by the control information of the PSCCH may be sent. A part of the SCI as control information may be mapped to the PSSCH and sent. The preamble signal for performing AGC may be sent separately in the physical channel structure in the side link time slot, but the side link channel and signal to be sent in the second symbol may be copied and sent in the first symbol, and the receiving terminal may use it to perform AGC.

[0157] Figures 10A, 10B, 10C and 10D are diagrams showing methods for determining DMRS time resources according to various embodiments of the present disclosure. Figures 10A and 10B are diagrams showing the position of symbols including DMRS when one symbol is used for DMRS transmitted in a time slot in side link transmission / reception. Referring to Figure 10A, an example is shown when a control channel (PSCCH) is transmitted in three symbols, and referring to Figure 10B, an example is shown when PSCCH is transmitted in two symbols. According to the embodiments of Figures 10A and 10B, the determination of the DMRS symbol position is independent of the number of symbols transmitting PSCCH, and therefore has the advantage of being easy to implement in the terminal. The symbol for performing the AGC required for side link reception can be transmitted in the first symbol, and the transmission in the symbol can be independent of the DMRS. For example, it is not necessary to use DMRS to decode the signal transmitted in the first symbol. Therefore, compared with the NR system of the prior art, DMRS can be modified or delayed. In addition, the DMRS symbol is not located in the first symbol because if AGC is performed in the first symbol, it may not be well used for channel estimation for demodulation and decoding.

[0158] Fig. 10C is a diagram showing a case where the PSCCH is transmitted in two symbols. Referring to Fig. 10C , the DMRS has a structure in which the DMRS may be transmitted immediately after the PSSCH, and this may enable channel estimation to be performed as quickly as possible.

[0159] In side link transmission / reception, it can be applied to transmission / reception between terminals including at least one of the DMRS symbol positions shown in Figures 10A, 10B, and 10C.

[0160] In side link transmission / reception, according to the configuration, a portion of the pattern provided in FIG. 10A, a portion of the pattern provided in FIG. 10B, or a portion of the pattern provided in FIG. 10C may be applied or combined to be applied to transmission / reception between terminals. In the above, the pattern may refer to the position of the DMRS in the time slot.

[0161] The position of the symbol where the DMRS is transmitted described in this embodiment may be changed according to the subcarrier spacing of the resources on which the sidelink transmission is performed and applied to other possible positions.

[0162] In addition, the position of the symbol for transmitting DMRS described in this embodiment can be applied by combining patterns of different positions according to the allocation length of PSSCH. In the above, the allocation length of PSSCH can be the number of symbols used for PSSCH transmission (excluding AGC symbols, including DMRS).

[0163] In addition, in the method provided in this embodiment of the present disclosure, the PSSCH may be mapped to DMRS symbols according to the availability of resources.

[0164] In addition, in the method provided in this embodiment of the present disclosure, a portion of the control information may be mapped to a DMRS symbol according to resources of the PSSCH or availability of resources.

[0165] The DMRS pattern provided in this embodiment can be a physical absolute symbol position within a time slot, but according to an example of application, it can also be a relative symbol position. For example, the position of the DMRS symbol can change according to the position of the symbol used for the side link within the time slot. For example, when p is the index of the first symbol of the PSCCH, the position of the DMRS symbol provided in the embodiment can be given as a relative offset value from p. Refer to Figure 10D, which shows an embodiment of applying a portion of Figure 10A when the first three symbols in the time slot are used for the downlink. Figures 11A, 11B, and 11C are diagrams showing a method for determining DMRS time resources according to various embodiments of the present disclosure.

[0166] Figures 11A and 11B are diagrams showing the position of symbols including DMRS when the DMRS transmitted in a time slot is transmitted in two symbols in side link transmission / reception. With reference to Figure 11A, an example is shown when a control channel (PSCCH) is transmitted in three symbols, and with reference to Figure 11B, an example is shown when PSCCH is transmitted in two symbols. According to the embodiments of Figures 11A and 11B, the determination of the DMRS symbol position is independent of the number of symbols transmitting PSCCH, and therefore has the advantage of being easy to implement at the terminal. The symbol for performing the AGC required for side link reception can be transmitted in the first symbol, and the transmission in the symbol can be independent of the DMRS. For example, it is not necessary to use DMRS to decode the signal transmitted in the first symbol. Therefore, compared with the NR system with related technology, DMRS can be modified or delayed. In addition, the DMRS symbol is not located in the first symbol, because if AGC is performed in the first symbol, it may not be well used for channel estimation for demodulation and decoding.

[0167] Referring to FIG11C , it shows a case where the PSCCH is transmitted in two symbols. In FIG11C , the DMRS has a structure in which the DMRS can be transmitted immediately after the PSSCH, and this can enable channel estimation to be performed as quickly as possible.

[0168] In side link transmission / reception, it can be applied to transmission / reception between terminals including at least one of the DMRS symbol positions shown in FIGS. 11A , 11B , and 11C .

[0169] In side link transmission / reception, according to the configuration, a portion of the pattern provided in FIG. 11A, a portion of the pattern provided in FIG. 11B, or a portion of the pattern provided in FIG. 11C may be applied or combined to be applied to transmission / reception between terminals. In the above, the pattern may refer to the position of the DMRS in the time slot.

[0170] 12A , 12B, 12C, and 12D are diagrams illustrating a method of determining a DMRS time resource according to various embodiments of the present disclosure.

[0171] With reference to Figures 12A, 12B, 12C and 12D, it is a diagram showing the position of the symbol including DMRS when the DMRS transmitted in a time slot is transmitted in three symbols in the side link transmission / reception. Figures 12A and 12C show the control channel (PSCCH) transmitted in three symbols, and Figures 12B and 12D show when PSCCH is transmitted in two symbols. When Figures 12A and 12B are used together, or when Figures 12C and 12D are used together, the position of the DMRS symbol is determined, regardless of the number of symbols to which PSCCH is transmitted, and therefore, it may have the advantage of being easy to implement in the terminal. The symbol for performing the AGC required for the side link reception may be transmitted in the first symbol, and the transmission in the symbol may be unrelated to the DMRS. For example, it is not necessary to use DMRS to decode the signal transmitted in the first symbol. Therefore, compared with the NR system with related technology, DMRS can be modified or delayed. In addition, the DMRS symbol is not located in the first symbol because if AGC is performed in the first symbol, it may not be well used for channel estimation for demodulation and decoding.

[0172] In side link transmission / reception, it can be applied to transmission / reception between terminals including at least one of the DMRS symbol positions shown in Figures 12A, 12B, 12C, and 12D.

[0173] In side link transmission / reception, according to the configuration, a portion of the pattern provided in FIG. 12A, a portion of the pattern provided in FIG. 12B, a portion of the pattern provided in FIG. 12C, or a portion of the pattern provided in FIG. 12D may be applied or combined to be applied to transmission / reception between terminals. In the above, the pattern may refer to the position of the DMRS in the time slot.

[0174] 13A , 13B, 13C, 13D, 13E, 13F, and 13G are diagrams illustrating a method of determining a DMRS time resource according to various embodiments of the present disclosure.

[0175] With reference to Figures 13A, 13B, 13C and 13D, it is a diagram showing the position of the symbol including the DMRS when the DMRS transmitted in a time slot is transmitted in four symbols in the side link transmission / reception. Figures 13A and 13C show the control channel (PSCCH) transmitted in three symbols, and Figures 13B and 13D show when the PSCCH is transmitted in two symbols. When Figures 13A and 13B are used together, or when Figures 13C and 13D are used together, the determination of the position of the DMRS symbol can be independent of the number of symbols to which the PSCCH is transmitted, and therefore can have the advantage of being easy to implement at the terminal. The symbol for performing the AGC required for the side link reception can be transmitted in the first symbol, and the transmission in the symbol can be independent of the DMRS. For example, it is not necessary to use DMRS to decode the signal transmitted in the first symbol. Therefore, compared with the NR system with related technology, the DMRS can be modified or delayed. In addition, the DMRS symbol is not located in the first symbol because if AGC is performed in the first symbol, it may not be well used for channel estimation for demodulation and decoding.

[0176] In side link transmission / reception, it can be applied to transmission / reception between terminals including at least one of the DMRS symbol positions shown in Figures 13A, 13B, 13C, and 13D.

[0177] In side link transmission and reception, according to the configuration, a portion of the pattern provided in FIG. 13A, a portion of the pattern provided in FIG. 13B, a portion of the pattern provided in FIG. 13C, or a portion of the pattern provided in FIG. 13D may be applied or combined to be applied to transmission / reception between terminals. In the above, the pattern may refer to the position of the DMRS in the time slot.

[0178] In the above, Figures 13C and 13D may illustrate a scheme in which the relative positions of downlink DMRS symbols in the NR system of the related art are reused to the maximum extent. Specifically, for example, part (a) of Figure 13E shows a method for sending DMRS in 1, 2, 3 or 4 symbols based on reusing the relative positions of downlink DMRS symbols in the NR system. Part (b) of Figure 13E shows a method for sending DMRS in 1, 2, 3 or 4 symbols based on reusing the relative positions of downlink DMRS symbols as much as possible in the NR system. Compared with part (a) of Figure 13E, part (b) of Figure 13E may illustrate a method for improving the decoding performance of PSSCH by increasing the position of the first DMRS symbol by 1. Of course, the DMRS position provided in part (a) or (b) of Figure 13E can be used in combination with the DMRS position provided above.

[0179] Referring to FIG. 13E , it may be modified and applied as shown in FIG. 13F or FIG. 13G .

[0180] Third embodiment

[0181] The third embodiment provides another example of a method and apparatus for transmitting a DMRS in side link data transmission including communication between terminals.

[0182] 14A , 14B, 14C, 14D, and 14E are diagrams illustrating a method of determining a DMRS time resource according to various embodiments of the present disclosure.

[0183] In this embodiment of the present disclosure, another example of reusing the relative positions of downlink DMRS symbols (i.e., DMRS symbols of PDSCH) as much as possible in the NR system of the related art is provided. In addition, this embodiment provides another example of maximizing the reuse of the relative positions of uplink DMRS symbols (i.e., DMRS symbols of PUSCH) in the NR system of the related art. The above-mentioned DMRS symbols of PUSCH may vary according to the PUSCH type of the NR system. In the case of PUSCH type A, the position of the DMRS symbol is the same as the position of the DMRS symbol of the PDSCH as the downlink, and in the case of PUSCH type B, the position of the DMRS symbol is different from the position of the DMRS symbol of the PDSCH as the downlink.

[0184] If the positions of the DMRS of the PDSCH and the DMRS of PUSCH type A defined in the NR system of the related art in the time slot are considered to be the relative positions from the first symbol of the PSCCH, which is a control channel transmitted in the time slot of the side link, these positions can be applied as shown in Figures 14B, 14C, 14D and 14E.

[0185] Referring to Figures 14B, 14C, 14D, and 14E, they are diagrams showing patterns including 1, 2, 3, and 4 DMRS symbols, respectively, and each may be a pattern used according to a parameter value (such as dmrs_number or dmrs-AdditionalPosition, the number of symbols used for PSSCH mapping, and the number of symbols used for PSCCH). For example, when dmrs-AdditionalPosition = pos2 (here, in dmrs-AdditionalPosition, it may refer to the number of additional symbols other than 1, and, for example, pos2 may refer to a total of 3 DMRS symbols, i.e., posX may refer to a parameter value of a total of X+1 symbols), one of the DMRS patterns shown may be selected and used according to the number of PSSCH symbols and the number of PSCCH symbols among the DMRS patterns shown in Figure 14D.

[0186] 14B , 14C , 14D , and 14E illustrate patterns in which the position of the first DMRS that appears may vary according to the number of PSCCH symbols, and the number of PSCCH symbols may be configured in a resource pool or may be determined by a preset value.

[0187] In the diagram described in this embodiment of the present disclosure, a diagram is shown showing for what purpose a total of 14 OFDM symbols are used, and as shown in FIG. 14A , OFDM symbol indexes and frequency resources are assumed.

[0188] 15A , 15B, 15C, and 15D are diagrams illustrating a method of determining a DMRS time resource according to various embodiments of the present disclosure.

[0189] According to an embodiment of the present disclosure, if the position of the DMRS of PUSCH type B defined in the NR system in the time slot is considered to be the relative position from the first symbol of the PSCCH, which is a control channel transmitted in the time slot of the side link, these positions can be applied as shown in Figures 15A, 15B, 15C and 15D.

[0190] Referring to Figures 15A, 15B, 15C, and 15D, they are diagrams showing patterns including 1, 2, 3, and 4 DMRS symbols, respectively, and each may be a pattern used according to a parameter value (such as dmrs_number or dmrs-AdditionalPosition and the number of symbols used for PSSCH mapping). For example, when dmrs-AdditionalPosition = pos2 (here, dmrs-AdditionalPosition may refer to the number of additional symbols other than 1, and, for example, pos2 may refer to a total of 3 DMRS symbols, i.e., posX may be a parameter value meaning a total of X+1 symbols), one of the DMRS patterns shown may be selected and used according to the number of PSSCH symbols among the DMRS patterns shown in Figure 15D.

[0191] In the present disclosure, the position of the first symbol of PSCCH (which is a control channel transmitted in a time slot of a side link) may refer to the second symbol used as a side link in the time slot.

[0192] In the present disclosure, parameter values ​​such as dmrs_number or dmrs-AdditionalPosition may be values ​​sent from control information (SCI) or first control information (first stage SCI). Alternatively, parameter values ​​such as dmrs_number or dmrs-AdditionalPosition may be values ​​configured in the resource pool, or may be values ​​indicated by SCI among values ​​configured in the resource pool. For example, a 2-bit indicator is sent in the SCI, and the 2-bit indicator may indicate the value of dmrs-AdditionalPosition.

[0193] Fig.16 is a diagram illustrating a method for determining DMRS time resources according to an embodiment of the present disclosure.

[0194] refer to Fig.16 According to an embodiment of the present disclosure, at least one of the patterns of Figures 14B to 14E and Figures 15A to 15D can be combined with each other to be supported in the side link. For example, a DMRS pattern including one symbol DMRS in the side link can use the pattern of Figure 14B. This is because the pattern of Figure 15A does not include DMRS in some frequency domains, so the data decoding performance may deteriorate. In addition, for example, a DMRS pattern including two symbol DMRS in the side link can be used in combination with Figures 14C and 15B, and in the pattern shown in Figure 14C, only one DMRS symbol is supported in the short-length PSSCH. The pattern according to this embodiment can be as shown in Figure 14B. Fig.16 As shown. Fig.16In addition to the pattern, for example, a DMRS pattern including 3-symbol DMRS in the side link can use Figure 15C, and a DMRS pattern including 4-symbol DMRS in the side link can use Figure 15D.

[0195] According to the example provided in this embodiment of the present disclosure, in FIG. 14B, FIG. 14C, FIG. 14D, FIG. 14E, FIG. 15A, FIG. 15B, FIG. 15C, FIG. 15D, and FIG. Fig.16 In the embodiment, some patterns or a combination of some patterns provided according to the length of the PSSCH and the length of the PSCCH may be used.

[0196] Depending on the subcarrier spacing, other possible positions may be applied as the position of the symbol for transmitting the DMRS described in this embodiment. Fig.16 In the example of FIG. 1 , some patterns or a combination of some patterns among the patterns provided according to the length of the PSSCH and the length of the PSCCH may be used differently according to the subcarrier spacing.

[0197] The position of the symbol for transmitting DMRS described in this embodiment can be applied by combining patterns of different positions according to the allocation length of PSSCH.In the above, the allocation length of PSSCH can be the number of symbols used for PSSCH transmission (including DMRS, excluding AGC symbols).

[0198] In addition, in the method provided in this embodiment of the present disclosure, the PSSCH may be mapped to DMRS symbols according to the availability of available resources.

[0199] In addition, in the method provided in this embodiment of the present disclosure, a portion of the control information may be mapped to the DMRS symbol according to the availability of available resources or resources of the PSSCH.

[0200] Depending on the embodiment applied, the DMRS pattern provided in this embodiment may be a physical absolute symbol position within a time slot, but may also be a relative symbol position. For example, the position of the DMRS symbol may change depending on the position of the symbol used for the sidelink within the time slot. For example, when p is the index of the first symbol of the PSCCH, the position of the DMRS symbol provided in this embodiment may be given as a relative offset value from p. As an example, when the first three symbols in the time slot are used for the downlink, the application Fig.16 An embodiment of a portion of may be implemented as in the pattern of FIG. 10D .

[0201] The transmitter, receiver and processor of the terminal and the base station implementing the above-mentioned embodiment are respectively Fig.17 and Fig.18 In order to perform the sidelink related operations proposed by the first to third embodiments of the present disclosure, the receiver, processor and transmitter of the base station and the terminal must operate according to the respective embodiments.

[0202] Fig.17 is a block diagram showing an internal structure of a terminal according to an embodiment of the present disclosure.

[0203] refer to Fig.17 , the terminal of the present disclosure may include a terminal receiver 1700, a terminal transmitter 1704 and a terminal processor 1702. In one embodiment, the terminal receiver 1700 and the terminal transmitter 1704 may be collectively referred to as a transceiver. The transceiver may send and receive signals with a base station. The signal may include control information and data. To this end, the transceiver may include an RF transmitter that up-converts and amplifies the frequency of the transmitted signal, and an RF receiver that amplifies the received signal with low noise and down-converts the frequency. In addition, the transceiver may receive a signal through a wireless channel, output it to the terminal processor 1702, and transmit the signal output from the terminal processor 1702 through the wireless channel. The terminal processor 1702 may control a series of processes so that the terminal may operate according to the above-mentioned embodiment.

[0204] Fig.18 is a block diagram showing the internal structure of a base station according to an embodiment of the present disclosure.

[0205] refer to Fig.18 , the base station may include a base station receiver 1801, a base station transmitter 1805, and a base station processor 1803. In one embodiment, the base station receiver 1801 and the base station transmitter 1805 may be collectively referred to as a transceiver. The transceiver may send and receive signals with the terminal. The signal may include control information and data. To this end, the transceiver may include an RF transmitter that amplifies and up-converts the frequency of the transmitted signal, and an RF receiver that amplifies the received signal with low noise and down-converts the frequency. In addition, the transceiver may receive a signal through a wireless channel, output it to the base station processing unit 1803, and transmit the signal output from the base station processor 1803 through the wireless channel. The base station processor 1803 may control a series of processes so that the base station can operate according to the above-mentioned embodiment.

[0206] The present disclosure has been shown and described with reference to various embodiments thereof, and it will be understood by those skilled in the art that various changes in form and details may be made without departing from the spirit and scope of the present disclosure as defined by the appended claims and their equivalents.

Claims

1. A method performed by a first terminal in a wireless communication system, the method comprising: Determine the number of symbols used for physical side link shared channel PSSCH transmission and the number of symbols used for PSSCH demodulation reference signal DMRS; Sending side link control information SCI for scheduling the PSSCH transmission to the second terminal, the SCI including DMRS pattern information determined based on the number of symbols used for the PSSCH DMRS; as well as sending at least one PSSCH DMRS to the second terminal at a position determined based on the SCI, wherein at least one symbol index of the position at which the at least one PSSCH DMRS is sent is determined based on the number of symbols used for the PSSCH transmission, the number of symbols of the physical sidelink control channel PSCCH through which the SCI is sent, and the number of symbols used for the PSSCH DMRS, Wherein, when the number of symbols of the PSCCH is 2, the at least one symbol index of the position for sending the at least one PSSCH DMRS is determined by one of the first index groups, Wherein, when the number of symbols of the PSCCH is 3, the at least one symbol index of the position for sending the at least one PSSCH DMRS is determined by one of the second index groups, and Among them, the first index group includes {1, 5}, {3, 8}, {3, 10}, {1, 4, 7}, {1, 5, 9}, {1, 6, 11} and {1, 4, 7, 10}, and the second index group includes {1, 5}, {4, 8}, {4, 10}, {1, 4, 7}, {1, 5, 9}, {1, 6, 11} and {1, 4, 7, 10}.

2. The method according to claim 1, in, The at least one symbol index of the position at which the at least one PSSCH DMRS is transmitted is determined by one of a plurality of index groups, the plurality of index groups being included in a third index group having a symbol number of 2 for the PSSCH DMRS, a fourth index group having a symbol number of 3 for the PSSCH DMRS, and a fifth index group having a symbol number of 4 for the PSSCH DMRS, and Among them, the third index group includes {1,5}, {3,8}, {3,10}, {4,8} and {4,10}, the fourth index group includes {1,4,7}, {1,5,9} and {1,6,11}, and the fifth index group includes {1,4,7,10}.

3. The method according to claim 1, in, In a case where the number of symbols used for the PSSCH DMRS is 2, the number of symbols used for the PSSCH transmission is 7 or 8, and the number of symbols used for the PSCCH is 2 or 3, the symbol index of the position where the at least one PSSCH DMRS is transmitted is {1,5}, Wherein, when the number of symbols used for the PSSCH DMRS is 2, the number of symbols used for the PSSCH transmission is 9 or 10, and the number of symbols used for the PSCCH is 2, the symbol index of the position for sending the at least one PSSCH DMRS is {3, 8}, Wherein, when the number of symbols used for the PSSCH DMRS is 2, the number of symbols used for the PSSCH transmission is 9 or 10, and the number of symbols used for the PSCCH is 3, the symbol index of the position for sending the at least one PSSCH DMRS is {4, 8}, Wherein, when the number of symbols used for the PSSCH DMRS is 2, the number of symbols used for the PSSCH transmission is 11, 12 or 13, and the number of symbols used for the PSCCH is 2, the symbol index of the position for sending the at least one PSSCH DMRS is {3, 10}, and In which, when the number of symbols used for the PSSCH DMRS is 2, the number of symbols used for the PSSCH transmission is 11, 12 or 13, and the number of symbols used for the PSCCH is 3, the symbol index of the position for sending the at least one PSSCH DMRS is {4, 10}.

4. The method according to claim 1, in, In a case where the number of symbols used for the PSSCH DMRS is 3, the number of symbols used for the PSSCH transmission is 9 or 10, and the number of symbols used for the PSCCH is 2 or 3, the symbol index of the position where the at least one PSSCH DMRS is transmitted is {1, 4, 7}, Wherein, when the number of symbols used for the PSSCH DMRS is 3, the number of symbols used for the PSSCH transmission is 11 or 12, and the number of symbols used for the PSCCH is 2 or 3, the symbol index of the position for sending the at least one PSSCH DMRS is {1, 5, 9}, Wherein, when the number of symbols used for the PSSCH DMRS is 3, the number of symbols used for the PSSCH transmission is 13, and the number of symbols used for the PSCCH is 2 or 3, the symbol index of the position for sending the at least one PSSCH DMRS is {1, 6, 11}, and In which, when the number of symbols used for the PSSCH DMRS is 4, the number of symbols used for the PSSCH transmission is 11, 12 or 13, and the number of symbols used for the PSCCH is 2 or 3, the symbol index of the position for sending the at least one PSSCH DMRS is {1, 4, 7, 10}.

5. A method performed by a second terminal in a wireless communication system, the method comprising: Receiving sidelink control information SCI for scheduling physical sidelink shared channel PSSCH transmission from the first terminal, wherein the SCI includes DMRS pattern information determined based on the number of symbols used for the PSSCH demodulation reference signal DMRS; determining, based on the SCI, a number of symbols used for the PSSCH transmission and a number of symbols used for the PSSCH DMRS; as well as receiving at least one PSSCH DMRS from the first terminal at a position determined based on the SCI, wherein at least one symbol index of the position where the at least one PSSCH DMRS is received is determined based on the number of symbols used for the PSSCH transmission, the number of symbols of the physical sidelink control channel PSCCH through which the SCI is sent, and the number of symbols used for the PSSCH DMRS, Wherein, when the number of symbols of the PSCCH is 2, the at least one symbol index of the position for receiving the at least one PSSCH DMRS is determined by one of the first index groups, Wherein, when the number of symbols of the PSCCH is 3, the at least one symbol index of the position for receiving the at least one PSSCH DMRS is determined by one of the second index groups, and Among them, the first index group includes {1, 5}, {3, 8}, {3, 10}, {1, 4, 7}, {1, 5, 9}, {1, 6, 11} and {1, 4, 7, 10}, and the second index group includes {1, 5}, {4, 8}, {4, 10}, {1, 4, 7}, {1, 5, 9}, {1, 6, 11} and {1, 4, 7, 10}.

6. The method according to claim 5, in, The at least one symbol index of the position where the at least one PSSCH DMRS is received is determined by one of a plurality of index groups, the plurality of index groups being included in a third index group having a symbol number of 2 for the PSSCH DMRS, a fourth index group having a symbol number of 3 for the PSSCH DMRS, and a fifth index group having a symbol number of 4 for the PSSCH DMRS, and Among them, the third index group includes {1,5}, {3,8}, {3,10}, {4,8} and {4,10}, the fourth index group includes {1,4,7}, {1,5,9} and {1,6,11}, and the fifth index group includes {1,4,7,10}.

7. The method according to claim 5, in, In a case where the number of symbols used for the PSSCH DMRS is 2, the number of symbols used for the PSSCH transmission is 7 or 8, and the number of symbols used for the PSCCH is 2 or 3, the symbol index of the position where the at least one PSSCH DMRS is received is {1,5}, Wherein, when the number of symbols used for the PSSCH DMRS is 2, the number of symbols used for the PSSCH transmission is 9 or 10, and the number of symbols used for the PSCCH is 2, the symbol index of the position for receiving the at least one PSSCH DMRS is {3, 8}, Wherein, when the number of symbols used for the PSSCH DMRS is 2, the number of symbols used for the PSSCH transmission is 9 or 10, and the number of symbols used for the PSCCH is 3, the symbol index of the position for receiving the at least one PSSCH DMRS is {4, 8}, Wherein, when the number of symbols used for the PSSCH DMRS is 2, the number of symbols used for the PSSCH transmission is 11, 12 or 13, and the number of symbols used for the PSCCH is 2, the symbol index of the position for receiving the at least one PSSCH DMRS is {3, 10}, In which, when the number of symbols used for the PSSCH DMRS is 2, the number of symbols used for the PSSCH transmission is 11, 12 or 13, and the number of symbols used for the PSCCH is 3, the symbol index of the position for receiving the at least one PSSCH DMRS is {4, 10}.

8. The method according to claim 5, in, In a case where the number of symbols used for the PSSCH DMRS is 3, the number of symbols used for the PSSCH transmission is 9 or 10, and the number of symbols used for the PSCCH is 2 or 3, the symbol index of the position where the at least one PSSCH DMRS is received is {1, 4, 7}, Wherein, when the number of symbols used for the PSSCH DMRS is 3, the number of symbols used for the PSSCH transmission is 11 or 12, and the number of symbols used for the PSCCH is 2 or 3, the symbol index of the position for receiving the at least one PSSCH DMRS is {1, 5, 9}, and Wherein, when the number of symbols used for the PSSCH DMRS is 3, the number of symbols used for the PSSCH transmission is 13, and the number of symbols used for the PSCCH is 2 or 3, the symbol index of the position for receiving the at least one PSSCH DMRS is {1, 6, 11}, and In which, when the number of symbols used for the PSSCH DMRS is 4, the number of symbols used for the PSSCH transmission is 11, 12 or 13, and the number of symbols used for the PSCCH is 2 or 3, the symbol index of the position for receiving the at least one PSSCH DMRS is {1, 4, 7, 10}.

9. A first terminal in a wireless communication system, the first terminal comprising: Transceiver; as well as At least one processor configured to: Determine the number of symbols used for physical side link shared channel PSSCH transmission and the number of symbols used for PSSCH demodulation reference signal DMRS, sending, via the transceiver, to a second terminal sidelink control information SCI for scheduling the PSSCH transmission, the SCI including DMRS pattern information determined based on the number of symbols used for the PSSCH DMRS, and transmitting, via the transceiver, at least one PSSCH DMRS to the second terminal at a position determined based on the SCI, wherein at least one symbol index of the position where the at least one PSSCH DMRS is sent is determined based on the number of symbols used for the PSSCH transmission, the number of symbols of the physical sidelink control channel PSCCH through which the SCI is sent, and the number of symbols used for the PSSCH DMRS, Wherein, when the number of symbols of the PSCCH is 2, the at least one symbol index of the position for sending the at least one PSSCH DMRS is determined by one of the first index groups, Wherein, when the number of symbols of the PSCCH is 3, the at least one symbol index of the position for sending the at least one PSSCH DMRS is determined by one of the second index groups, and Among them, the first index group includes {1, 5}, {3, 8}, {3, 10}, {1, 4, 7}, {1, 5, 9}, {1, 6, 11} and {1, 4, 7, 10}, and the second index group includes {1, 5}, {4, 8}, {4, 10}, {1, 4, 7}, {1, 5, 9}, {1, 6, 11} and {1, 4, 7, 10}.

10. The first terminal according to claim 9, in, The at least one symbol index of the position at which the at least one PSSCH DMRS is transmitted is determined by one of a plurality of index groups, the plurality of index groups being included in a third index group having a symbol number of 2 for the PSSCH DMRS, a fourth index group having a symbol number of 3 for the PSSCH DMRS, and a fifth index group having a symbol number of 4 for the PSSCH DMRS, and Among them, the third index group includes {1,5}, {3,8}, {3,10}, {4,8} and {4,10}, the fourth index group includes {1,4,7}, {1,5,9} and {1,6,11}, and the fifth index group includes {1,4,7,10}.

11. The first terminal according to claim 9, in, In a case where the number of symbols used for the PSSCH DMRS is 2, the number of symbols used for the PSSCH transmission is 7 or 8, and the number of symbols used for the PSCCH is 2 or 3, the symbol index of the position where the at least one PSSCH DMRS is transmitted is {1,5}, Wherein, when the number of symbols used for the PSSCH DMRS is 2, the number of symbols used for the PSSCH transmission is 9 or 10, and the number of symbols used for the PSCCH is 2, the symbol index of the position for sending the at least one PSSCH DMRS is {3, 8}, Wherein, when the number of symbols used for the PSSCH DMRS is 2, the number of symbols used for the PSSCH transmission is 9 or 10, and the number of symbols used for the PSCCH is 3, the symbol index of the position for sending the at least one PSSCH DMRS is {4, 8}, Wherein, when the number of symbols used for the PSSCH DMRS is 2, the number of symbols used for the PSSCH transmission is 11, 12 or 13, and the number of symbols used for the PSCCH is 2, the symbol index of the position for sending the at least one PSSCH DMRS is {3, 10}, and In which, when the number of symbols used for the PSSCH DMRS is 2, the number of symbols used for the PSSCH transmission is 11, 12 or 13, and the number of symbols used for the PSCCH is 3, the symbol index of the position for sending the at least one PSSCH DMRS is {4, 10}.

12. The first terminal according to claim 9, in, In a case where the number of symbols used for the PSSCH DMRS is 3, the number of symbols used for the PSSCH transmission is 9 or 10, and the number of symbols used for the PSCCH is 2 or 3, the symbol index of the position where the at least one PSSCH DMRS is transmitted is {1, 4, 7}, Wherein, when the number of symbols used for the PSSCH DMRS is 3, the number of symbols used for the PSSCH transmission is 11 or 12, and the number of symbols used for the PSCCH is 2 or 3, the symbol index of the position for sending the at least one PSSCH DMRS is {1, 5, 9}, Wherein, when the number of symbols used for the PSSCH DMRS is 3, the number of symbols used for the PSSCH transmission is 13, and the number of symbols used for the PSCCH is 2 or 3, the symbol index of the position for sending the at least one PSSCH DMRS is {1, 6, 11}, and In which, when the number of symbols used for the PSSCH DMRS is 4, the number of symbols used for the PSSCH transmission is 11, 12 or 13, and the number of symbols used for the PSCCH is 2 or 3, the symbol index of the position for sending the at least one PSSCH DMRS is {1, 4, 7, 10}.

13. A second terminal in a wireless communication system, the second terminal comprising: Transceiver; as well as At least one processor configured to: receiving, via the transceiver, sidelink control information SCI for scheduling physical sidelink shared channel PSSCH transmission from the first terminal, the SCI including DMRS pattern information determined based on the number of symbols used for a PSSCH demodulation reference signal DMRS, determining the number of symbols used for the PSSCH transmission and the number of symbols used for the PSSCH DMRS based on the SCI, and receiving, via the transceiver, at least one PSSCH DMRS from the first terminal at a location determined based on the SCI, wherein at least one symbol index of the position where the at least one PSSCH DMRS is received is determined based on the number of symbols used for the PSSCH transmission, the number of symbols of the physical sidelink control channel PSCCH through which the SCI is sent, and the number of symbols used for the PSSCH DMRS, Wherein, when the number of symbols of the PSCCH is 2, the at least one symbol index of the position for receiving the at least one PSSCH DMRS is determined by one of the first index groups, Wherein, when the number of symbols of the PSCCH is 3, the at least one symbol index of the position for receiving the at least one PSSCH DMRS is determined by one of the second index groups, and Among them, the first index group includes {1, 5}, {3, 8}, {3, 10}, {1, 4, 7}, {1, 5, 9}, {1, 6, 11} and {1, 4, 7, 10}, and the second index group includes {1, 5}, {4, 8}, {4, 10}, {1, 4, 7}, {1, 5, 9}, {1, 6, 11} and {1, 4, 7, 10}.

14. The second terminal according to claim 13, in, The at least one symbol index of the position where the at least one PSSCH DMRS is received is determined by one of a plurality of index groups, the plurality of index groups being included in a third index group having a symbol number of 2 for the PSSCH DMRS, a fourth index group having a symbol number of 3 for the PSSCH DMRS, and a fifth index group having a symbol number of 4 for the PSSCH DMRS, and Among them, the third index group includes {1,5}, {3,8}, {3,10}, {4,8} and {4,10}, the fourth index group includes {1,4,7}, {1,5,9} and {1,6,11}, and the fifth index group includes {1,4,7,10}.

15. The second terminal according to claim 13, in, In a case where the number of symbols used for the PSSCH DMRS is 2, the number of symbols used for the PSSCH transmission is 7 or 8, and the number of symbols used for the PSCCH is 2 or 3, the symbol index of the position where the at least one PSSCH DMRS is received is {1,5}, Wherein, when the number of symbols used for the PSSCH DMRS is 2, the number of symbols used for the PSSCH transmission is 9 or 10, and the number of symbols used for the PSCCH is 2, the symbol index of the position for receiving the at least one PSSCH DMRS is {3, 8}, Wherein, when the number of symbols used for the PSSCH DMRS is 2, the number of symbols used for the PSSCH transmission is 9 or 10, and the number of symbols used for the PSCCH is 3, the symbol index of the position for receiving the at least one PSSCH DMRS is {4, 8}, Wherein, when the number of symbols used for the PSSCH DMRS is 2, the number of symbols used for the PSSCH transmission is 11, 12 or 13, and the number of symbols used for the PSCCH is 2, the symbol index of the position for receiving the at least one PSSCH DMRS is {3, 10}, and Wherein, when the number of symbols used for the PSSCH DMRS is 2, the number of symbols used for the PSSCH transmission is 11, 12 or 13, and the number of symbols used for the PSCCH is 3, the symbol index of the position for receiving the at least one PSSCH DMRS is {4, 10}, Wherein, when the number of symbols used for the PSSCH DMRS is 3, the number of symbols used for the PSSCH transmission is 9 or 10, and the number of symbols used for the PSCCH is 2 or 3, the symbol index of the position for receiving the at least one PSSCH DMRS is {1, 4, 7}, Wherein, when the number of symbols used for the PSSCH DMRS is 3, the number of symbols used for the PSSCH transmission is 11 or 12, and the number of symbols used for the PSCCH is 2 or 3, the symbol index of the position for receiving the at least one PSSCH DMRS is {1, 5, 9}, Wherein, when the number of symbols used for the PSSCH DMRS is 3, the number of symbols used for the PSSCH transmission is 13, and the number of symbols used for the PSCCH is 2 or 3, the symbol index of the position for receiving the at least one PSSCH DMRS is {1, 6, 11}, and In which, when the number of symbols used for the PSSCH DMRS is 4, the number of symbols used for the PSSCH transmission is 11, 12 or 13, and the number of symbols used for the PSCCH is 2 or 3, the symbol index of the position for receiving the at least one PSSCH DMRS is {1, 4, 7, 10}.

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