The method of communication between the first and second terminals is via a side line.

Abstract

The invention proposes a method by which a terminal device communicates with another terminal device via a side link, the method for which this communication is to be performed includes the following steps: receiving information related to the DMRS; simultaneously decoding the PSCCH DMRS and PSSCH DMRS; and decoding the PSSCH based on the decoded PSCCH DMRS and PSSCH DMRS. Accordingly, the data decoding step can be performed rapidly according to a resource allocation structure in which the PSCCH and PSSCH are present simultaneously in one or more symbols in the wireless communication system.

Description

Method and device for configuring DMRS in a wireless communication system

[0001] The present invention relates to a method and device for configuring a DMRS (Demodulation Reference Signal) for a terminal supporting vehicle-to-everything (V2X) communication in a wireless communication system. More specifically, the present invention provides a method and device for configuring a DMRS for V2X (Vehicle-to-Everything) in an NR (New Radio) system.

[0002]

[0003] The International Telecommunication Union (ITU) is developing the International Mobile Telecommunication (IMT) framework and standards, and is currently discussing fifth-generation (5G) communications through a program called "IMT for 2020 and beyond."

[0004] To meet the requirements presented in "IMT for 2020 and beyond," the 3rd Generation Partnership Project (3GPP) NR (New Radio) system is being discussed to support various numerologies based on time-frequency resource units, taking into account various scenarios, service requirements, and potential system compatibility.

[0005]

[0006] The present invention can provide a method and device for configuring DMRS in a terminal supporting vehicle communication in a wireless communication system and a method and device for indicating DMRS-related information for V2X.

[0007] The present invention can provide a DMRS configuration method and device for NR V2X in a wireless communication system.

[0008] The present invention can provide a method and device for configuring a DMRS in a wireless communication system by considering a resource allocation structure in which a PSCCH (Physical Control Channel) and a PSSCH (Physical Shared Channel) exist simultaneously within one or more symbols.

[0009] The present invention can provide a method and device for efficiently using resources by considering a resource allocation structure in which a PSCCH and a PSSCH exist simultaneously within one or more symbols in a wireless communication system.

[0010] The present invention can provide a method and device for quickly performing data decoding by considering a resource allocation structure in which a PSCCH and a PSSCH exist simultaneously within one or more symbols in a wireless communication system.

[0011]

[0012] The present invention can provide a method for a terminal to perform communication with another terminal via a sidelink. In this case, the method for performing communication can include the steps of: obtaining DMRS-related information; simultaneously decoding PSCCH DMRS and PSSCH DMRS; decoding PSCCH based on the decoded PSCCH DMRS; and decoding PSSCH based on the decoded PSCCH DMRS and PSSCH DMRS.

[0013] The features briefly summarized above regarding the present disclosure are merely exemplary aspects of the detailed description of the present disclosure that follows and do not limit the scope of the present disclosure.

[0014]

[0015] According to the present disclosure, a method and device for configuring DMRS in a terminal supporting vehicle communication in a wireless communication system can indicate DMRS-related information for V2X.

[0016] According to the present disclosure, a DMRS for NR V2X can be configured in a wireless communication system.

[0017] According to the present disclosure, in a wireless communication system, a DMRS can be configured by considering a resource allocation structure in which a PSCCH and a PSSCH exist simultaneously within one or more symbols.

[0018] According to the present disclosure, resources can be efficiently used in a wireless communication system by considering a resource allocation structure in which PSCCH and PSSCH exist simultaneously within one or more symbols.

[0019] According to the present disclosure, data decoding can be performed quickly in a wireless communication system by considering a resource allocation structure in which a PSCCH and a PSSCH exist simultaneously within one or more symbols.

[0020] The present invention is not limited to the effects described above, and other effects not mentioned will be clearly understood by those skilled in the art to which the present disclosure pertains from the description below.

[0021]

[0022] FIG. 1 is a diagram for explaining a V2X scenario to which the present disclosure can be applied.

[0023] FIG. 2 is a diagram for explaining a V2X scenario to which the present disclosure can be applied.

[0024] FIG. 3 is a diagram for explaining a V2X scenario to which the present disclosure can be applied.

[0025] FIG. 4 is a diagram showing V2X-related services to which the present disclosure can be applied.

[0026] FIG. 5 is a diagram showing a frame structure for downlink / uplink transmission to which the present disclosure can be applied.

[0027] FIG. 6 is a diagram showing a resource grid and resource block to which the present disclosure can be applied.

[0028] FIG. 7 is a diagram illustrating a PSCCH and PSSCH resource allocation method to which the present disclosure can be applied.

[0029] FIG. 8 is a diagram illustrating a PSCCH and PSSCH resource allocation method to which the present disclosure can be applied.

[0030] FIG. 9 is a diagram illustrating a PSCCH and PSSCH resource allocation method to which the present disclosure can be applied.

[0031] FIG. 10 is a diagram illustrating a PSCCH and PSSCH resource allocation method to which the present disclosure can be applied.

[0032] FIG. 11 is a diagram showing a PSCCH DMRS allocation pattern and a PSSCH DMRS allocation pattern to which the present disclosure can be applied.

[0033] FIG. 12 is a diagram showing a PSCCH DMRS allocation pattern and a PSSCH DMRS allocation pattern to which the present disclosure can be applied.

[0034] FIG. 13 is a diagram showing a PSCCH DMRS allocation pattern and a PSSCH DMRS allocation pattern to which the present disclosure can be applied.

[0035] FIG. 14 is a diagram showing a PSCCH DMRS allocation pattern and a PSSCH DMRS allocation pattern to which the present disclosure can be applied.

[0036] Figure 15 is a diagram showing a case where PSCCH DMRS and PSSCH DMRS are configured simultaneously and the PSCCH DMRS pattern position is fixed.

[0037] Figure 16 is a diagram showing a case where PSCCH DMRS and PSSCH DMRS are configured simultaneously and the PSCCH DMRS pattern position changes.

[0038] Figure 17 is a diagram showing the configuration of a base station device and a terminal device to which the present disclosure can be applied.

[0039]

[0040] The present invention provides a communication method in which a first terminal performs communication with a second terminal through a side link, the method comprising the steps of: obtaining information related to a DMRS (Demodulation Reference Signal); simultaneously decoding a PSCCH (Physical Sidelink Control Channel) DMRS and a PSSCH (Physical Sidelink Shared Channel) DMRS; and decoding a PSCCH based on the decoded PSCCH DMRS and decoding a PSSCH based on the decoded PSCCH DMRS and PSSCH DMRS.

[0041]

[0042] Hereinafter, embodiments of the present disclosure will be described in detail with reference to the attached drawings so that those skilled in the art can easily implement the present disclosure. However, the present disclosure may be implemented in various different forms and is not limited to the embodiments described herein.

[0043] In describing embodiments of the present disclosure, detailed descriptions of known configurations or functions will be omitted if they are deemed to obscure the gist of the present disclosure. Furthermore, portions unrelated to the description of the present disclosure in the drawings have been omitted, and similar portions have been designated with similar reference numerals.

[0044] In the present disclosure, when a component is said to be "connected," "coupled," or "connected" to another component, this may include not only a direct connection, but also an indirect connection in which another component exists in between. Furthermore, when a component is said to "include" or "have" another component, unless otherwise specifically stated, this does not exclude the other component, but rather implies that the other component may be included.

[0045] In this disclosure, terms such as first, second, etc. are used solely to distinguish one component from another, and do not limit the order or importance of components unless specifically stated otherwise. Accordingly, within the scope of this disclosure, a first component in one embodiment may be referred to as a second component in another embodiment, and similarly, a second component in one embodiment may be referred to as a first component in another embodiment.

[0046] In this disclosure, distinct components are used to clearly illustrate their respective characteristics, and do not necessarily imply that the components are separated. That is, multiple components may be integrated into a single hardware or software unit, or a single component may be distributed into multiple hardware or software units. Therefore, even if not specifically mentioned, such integrated or distributed embodiments are also included within the scope of this disclosure.

[0047] In the present disclosure, the components described in various embodiments are not necessarily essential components, and some may be optional components. Therefore, embodiments comprising a subset of the components described in one embodiment are also within the scope of the present disclosure. Furthermore, embodiments including other components in addition to the components described in various embodiments are also within the scope of the present disclosure.

[0048] In addition, this specification describes a wireless communication network, and work performed in a wireless communication network may be performed in a process of controlling the network and transmitting data in a system (e.g., a base station) that manages the wireless communication network, or work may be performed in a terminal connected to the wireless network.

[0049] That is, it is obvious that various operations performed for communication with a terminal in a network consisting of a plurality of network nodes including a base station can be performed by the base station or other network nodes other than the base station. 'Base Station (BS)' can be replaced by terms such as fixed station, Node B, eNodeB (eNB), gNodeB (gNB), Access Point (AP), etc. In addition, 'terminal' can be replaced by terms such as User Equipment (UE), Mobile Station (MS), Mobile Subscriber Station (MSS), Subscriber Station (SS), non-AP Station (non-AP STA), etc.

[0050] In the present disclosure, transmitting or receiving a channel means transmitting or receiving information or a signal through the channel. For example, transmitting a control channel means transmitting control information or a signal through the control channel. Similarly, transmitting a data channel means transmitting data information or a signal through the data channel.

[0051] In the following description, the term NR system is used for the purpose of distinguishing the system to which various examples of the present disclosure are applied from existing systems, but the scope of the present disclosure is not limited by such term.

[0052] For example, NR systems support various subcarrier spacings (SCS) considering various scenarios, service requirements, and potential system compatibility. In addition, NR systems can support transmission of physical signals / channels through multiple beams to overcome adverse channel conditions such as high path loss, phase noise, and frequency offset that occur at high carrier frequencies. Through this, NR systems can support applications such as enhanced Mobile Broadband (eMBB), massive Machine Type Communications (mMTC) / ultra Machine Type Communications (uMTC), and ultra reliable and low latency communications (URLLC). However, although the term "NR system" in this specification is used as an example of a wireless communication system, the term "NR system" itself is not limited to the above-described features.

[0053] Additionally, as an example, 5G mobile communication technology can be defined. In this case, for example, 5G mobile communication technology can be defined to encompass not only the aforementioned NR system but also the existing LTE-A (Long Term Evolution-Advanced) system. In other words, 5G mobile communication can be a technology that operates not only with the newly defined NR system but also with backward compatibility with previous systems.

[0054] For example, the sidelink field of 5G may encompass both sidelink technologies in LTE systems and NR systems. In this case, sidelink may be essential for performance enhancements, such as ultra-high reliability and ultra-low latency, and for the integration of new and diverse services.

[0055] For convenience of explanation, the following describes the operation and related information for V2X based on the NR system. However, the following features may not be limited to a specific system, and may be equally applicable to other similarly implemented systems, and are not limited to the above-described embodiments.

[0056] Meanwhile, V2X can be vehicle-based communication. At this time, the concept of vehicles is evolving from a simple means of transportation to a new platform. For example, IT technologies are being integrated into vehicles, and various V2X services are being provided based on this integration. Examples include services such as traffic accident prevention, traffic environment improvement, autonomous driving, and remote driving. To this end, there is a growing need for the development and application of sidelink-related technologies related to V2X.

[0057] More specifically, with respect to existing communication technologies, communication from a base station to a terminal may be a downlink, and communication from a terminal to a base station may be an uplink. However, communication between terminals may be required in addition to communication between a base station and a terminal, and communication from a terminal to a terminal may be the sidelink described above. For example, with respect to the V2X described above, communication between vehicles or communication between a vehicle and another object (an object other than a base station, such as a pedestrian UE or a UE-type roadside unit (RSU)) may be a sidelink. That is, when performing vehicle-based communication, communication with a base station alone has limitations, and therefore the sidelink technology described above can be developed and applied. Hereinafter, a DMRS-related information indication method for V2X will be described based on the above.

[0058] Figures 1 to 3 are diagrams showing V2X scenarios.

[0059] At this time, Fig. 1 may be a scenario for performing communication based on the above-described side link. In addition, Fig. 2 may be a V2X operation scenario utilizing communication between a terminal (or vehicle) and a base station. In addition, Fig. 3 may be a scenario for performing V2X operation utilizing both the above-described side link and communication with a base station.

[0060] Here, for example, in relation to V2X, the terminal described below may be a vehicle. For convenience of explanation, the terminal is referred to as a terminal below, but the terminal may be a vehicle for V2X. In addition, as an example, the terminal may refer to a device capable of performing sidelink and communication with a base station, and is not limited to the above-described embodiment. However, for convenience of explanation, the terminal is referred to as a terminal below.

[0061] In addition, as an example, terms required in relation to V2X can be defined as in Table 1 below. In this case, as an example, D2D (Device to Device) can mean communication between terminals. In addition, ProSe can mean a proximity service for a terminal performing D2D communication. In addition, SL (sidelink) can be the above-described sidelink, and SCI (Sidelink Control Information) can mean control information related to the above-described sidelink. In addition, PSSCH (Physical Sidelink Shared Channel) can be a channel through which data is transmitted via sidelink, and PSCCH (Physical Sidelink Control Channel) can be a channel through which control information is transmitted via sidelink. In addition, PSBCH (Physical Sidelink Broadcast Channel) can be a channel through which signals are transmitted in a broadcast manner via sidelink, and system information can be transmitted. In addition, PSDCH (Physical Sidelink Discovery Channel) can be a channel used as a discovery channel for the purpose of signal discovery. Additionally, SLSS (Sidelink Synchronization Signal) may be a synchronization signal for sidelink, and PSSID (Physical Sidelink Synchronization Identity) may be ID information for sidelink synchronization. In addition, (Sidelink group destination identity) is ID information for distinguishing the sidelink group. may be ID information for the aforementioned sidelink synchronization. Additionally, SA, TB, TTI, and RB in Table 1 may be terms used identically to those used in existing LTE. Furthermore, V2V may refer to vehicle-to-vehicle communication, V2P may refer to vehicle-to-pedestrian communication, and V2I / N may refer to vehicle-to-infrastructure / network communication. These will be described later.

[0062]

[0063]

[0064] In addition, as an example, in V2X communication, the control information transmitted from one terminal to another may be SA. If the above-described control information is used in sidelink communication, the above-described control information may be SCI. In this case, the above-described control information may be transmitted through the PSCCH, which is a channel through which control information is transmitted in the sidelink.

[0065] Additionally, as an example, in V2X communication, data transmitted from one terminal to another may be organized in TB units. In this case, when transmitting data via a sidelink, transmission may be performed via the PSSCH, which is the channel through which the aforementioned data is transmitted.

[0066] Additionally, in the present disclosure, an operation mode may be defined according to a resource allocation method for control information and data transmission for V2X communication or direct link (e.g. D2D, ProSe, or SL) communication.

[0067] For example, the eNodeB resource scheduling mode may be a mode in which the eNodeB or relay node schedules resources used by the terminal to transmit V2X (or direct link) control information and / or data. Through this, the terminal may transmit V2X (or direct link) control information and / or data, and this mode may be the eNodeB resource scheduling mode described above.

[0068] For example, a base station or relay node may provide sidelink (or direct link) control information and / or scheduling information on resources to be used for data transmission to a sidelink (or direct link) transmitting terminal via downlink control information (DCI). Accordingly, the sidelink (or direct link) transmitting terminal may transmit sidelink (or direct link) control information and data to a sidelink (or direct link) receiving terminal, and the sidelink (or direct link) receiving terminal may receive sidelink (or direct link) data based on the sidelink (or direct link) control information.

[0069] Meanwhile, UE autonomous resource selection mode allows the UE to select resources to be used for transmitting control information and data, and this resource selection can be determined by the UE sensing or the like from a resource pool (i.e., a set of resource candidates). Through this, the UE can transmit control information and data, and this mode can be UE autonomous resource selection mode.

[0070] For example, a sidelink (or direct link) transmitting terminal transmits sidelink (or direct link) control information and data to a sidelink (or direct link) receiving terminal from a resource selected by the terminal, and the sidelink (or direct link) receiving terminal can receive sidelink (or direct link) data based on the sidelink (or direct link) control information.

[0071] At this time, as an example, the above-described base station resource scheduling mode may be referred to as Mode 1 in sidelink (or direct link) communication for D2D, etc. In addition, the above-described base station resource scheduling mode may be referred to as Mode 3 in sidelink communication for V2X, etc. In addition, the terminal autonomous resource selection mode may be referred to as Mode 2 in sidelink (or direct link) communication for D2D, etc. In addition, the terminal autonomous resource selection mode may be referred to as Mode 4 in sidelink communication for V2X, etc. However, this is only one embodiment and is not limited to the above-described names. That is, the same target and the same operation may be viewed as the same mode.

[0072] Furthermore, for convenience of explanation, the following description will focus on V2X communication, but is not limited thereto. For example, the present invention can be equally applied to direct link-based communication, such as D2D and ProSe, and is not limited to the above-described embodiments.

[0073] Additionally, as an example, V2X may be a general term for V2V, V2P, and V2I / N. In this case, each of V2V, V2P, and V2I / N may be defined as in Table 1 below, but is not limited thereto. That is, Table 2 below is only one example and is not limited thereto.

[0074]

[0075] Additionally, V2X communication may include PC5-based communication, which is an interface for sidelink communication.

[0076] For example, Table 3 and Figure 1 below may be scenarios that support V2X operations based only on the PC5 interface (or SL). In this case, (a) in Figure 1 may be V2V operation, (b) may be V2I operation, and (c) may be V2P operation. That is, Figure 1 may be a method for performing communication based on the above-described side link, and communication may be performed without a base station.

[0077]

[0078] Meanwhile, Table 4 and Fig. 2 may be scenarios that support V2X operations based only on the Uu interface (i.e., the interface between the UE and the eNodeB). For example, (a) in Fig. 2 may represent V2V operations, (b) may represent V2I operations, and (c) may represent V2P operations. That is, V2X operations may be supported using communication between the terminal and the base station.

[0079]

[0080] Table 5 and Figure 3 may be scenarios that support V2X operations using both the Uu interface and the PC5 interface (or SL). In this case, Figure 3(a) may represent Scenario 3A of Table 5, and Figure 3(b) may represent Scenario 3B of Table 5.

[0081] More specifically, based on FIG. 3(a), a terminal can transmit a V2X message to other terminals via the sidelink. Any of the terminals receiving the message can then transmit the V2X message to the base station via the uplink. The base station can then receive the V2X message and transmit a message based on the message to other nearby terminals via the downlink. In this case, the downlink can be performed via a broadcast method, for example.

[0082] As another example, FIG. 3(b) illustrates a situation where a terminal transmits a V2X message to a base station via uplink, and the base station can then transmit the message to at least one terminal or RSU (Roadside Unit). The terminal or RSU that receives the message can then transmit the message to multiple surrounding terminals via sidelink.

[0083] That is, both FIG. 3(a) and FIG. 3(b) can support V2X operation by utilizing both communication between the base station and the terminal and side link, and are not limited to the above-described embodiment.

[0084]

[0085] As mentioned above, V2X communication can be achieved through a base station or through direct communication between terminals. In this case, when passing through a base station, transmission / reception can be achieved through the Uu link, which is the communication interface between the LTE base station and terminals in LTE-based V2X communication. In addition, when using the sidelink as direct communication between terminals, transmission / reception can be achieved through the PC5 link, which is the communication interface between LTE terminals in LTE-based V2X communication.

[0086] In addition, as an example, V2X communication can be performed in the NR system using communication between the terminal and the base station and sidelink between the terminals. In this case, for example, there may be differences in the communication (uplink / downlink) between the base station and the terminal in the NR system and the communication (uplink / downlink) between the base station and the terminal in the existing system. That is, some features may be similar, and there may be parts that are changed based on the new NR system. In addition, as an example, the sidelink may also be different between the sidelink in the existing system and the sidelink in the NR system. That is, considering the differences in communication between the base station and the terminal described above, there may also be parts that are changed in the sidelink in the new NR system. Below, a method for transmitting DMRS-related information for V2X in the NR system based on the features described above is described.

[0087] Figure 4 is a diagram showing a service provided based on a side link.

[0088] Referring to FIG. 4, V2X-related services or IoT (Internet of Things) services can be provided based on 5G sidelinks. For example, the term "5G sidelink" may encompass both sidelinks based on existing LTE systems and sidelinks that consider NR systems. In other words, services may be provided based on sidelinks applicable to each system, and are not limited to the above-described embodiments.

[0089] For example, referring to FIG. 4, with respect to V2X services, platooning, automatic driving, advanced sensor, and remote driving services may be provided. In this case, platooning may be a technology in which multiple vehicles dynamically form a group and operate similarly. In addition, autonomous driving may be a technology for driving a vehicle based on full automation or semi-automation. In addition, advanced sensor may be a technology for collecting and exchanging data acquired from sensors or video images. In addition, remote driving may be a technology for technology and applications for remote control of a vehicle. In other words, the above-described services may be provided as V2X-based services. However, the above-described services are only one example and are not limited to the above-described embodiment. In this case, in order to provide the above-described V2X services, requirements such as ultra-low latency, hyper-connectivity, low power, and high reliability may be required. Therefore, in 5G sidelink, an operation method may be required to satisfy the above-described service and its requirements, and below, a specific method is described taking these requirements into consideration.

[0090] The following describes the NR system. As an example, FIGS. 5 and 6 are diagrams showing the frame structure and resource blocks for the NR system.

[0091] FIG. 5 is a diagram showing an NR frame structure and numerology according to one embodiment of the present invention.

[0092] In NR, the basic unit of time domain is It could be. At this time, And, It could be. Also, can be a constant for the multiple relationship between the NR time unit and the LTE time unit. In LTE, as a reference time unit, can be defined.

[0093]

[0094] Frame structure

[0095] Referring to Figure 5, the time structure of the frame for downlink and uplink (Downlink / Uplink, DL / UL) transmission is can have. At this time, one frame It consists of 10 subframes corresponding to time. The number of consecutive OFDM symbols in each subframe is It can be. In addition, each frame is divided into two half frames, and a half frame can be composed of subframes 0 to 4 and subframes 5 to 9. In this case, half frame 1 can be composed of subframes 0 to 4, and half frame 2 can be composed of subframes 5 to 9.

[0096] At this time, the transmission timing of the uplink transmission frame i is determined based on the downlink reception timing at the terminal using the following mathematical expression 1.

[0097] In the following mathematical formula 1 It may be a TA offset value that occurs due to differences in duplex mode, etc. Basically, in FDD (Frequency Division Duplex), has 0, but in TDD (Time Division Duplex), it takes into account the margin for DL-UL switching time. can be defined as a fixed value.

[0098] [Mathematical Formula 1]

[0099]

[0100] Figure 6 is a diagram showing a resource grid and a resource block.

[0101] Referring to Figure 6, resource elements within a resource grid can be indexed according to each subcarrier spacing (SCS). At this time, one resource grid can be created for each antenna port and each subcarrier spacing. Uplink and downlink transmission and reception can be performed based on the corresponding resource grid.

[0102] One resource block is composed of 12 resource elements in the frequency domain, and an index for one resource block is provided for each of the 12 resource elements as shown in the following mathematical expression 2. ) can be configured. The index for the resource block can be utilized within a specific frequency band or system bandwidth.

[0103] [Equation 2]

[0104]

[0105]

[0106] Numerologies

[0107] Numerous configurations can be implemented to meet the diverse services and requirements of NR systems. For example, unlike the single subcarrier spacing (SCS) supported by existing LTE / LTE-A systems, it can support multiple SCSs.

[0108] A novel numerology for NR systems that includes support for multiple SCSs can operate in frequency ranges or carriers such as 3 GHz or less, 3 GHz to 6 GHz, or 6 GHz to 52.6 GHz to address the issue of not being able to use a wide bandwidth in existing frequency ranges or carriers such as 700 MHz or 2 GHz. However, the scope of the present disclosure is not limited thereto.

[0109] For example, referring to Table 6 below, numerology can be defined based on subcarrier spacing (SCS), CP length, and number of OFDM symbols per slot used in an Orthogonal Frequency Division Multiplexing (OFDM) system. The above-described values ​​can be provided to the terminal through upper layer parameters DL-BWP-mu and DL-BWP-cp (DL) and UL-BWP-mu and UL-BWP-cp (UL).

[0110] Also, as an example, in Table 6 below In the case where the subcarrier spacing is 60 kHz, normal CP and extended CP can be applied, and in other bands, only normal CP can be applied.

[0111]

[0112] Here, a normal slot can be defined as a basic time unit used to transmit one piece of data and control information in an NR system. The length of a normal slot can be configured as the number of OFDM symbols, which is basically 14. In addition, unlike a slot, a subframe has an absolute time length equivalent to 1 ms in an NR system and can be used as a reference time for the length of other time intervals. At this time, a time interval similar to an LTE subframe may be required in the NR standard to ensure coexistence or backward compatibility between LTE and NR systems.

[0113] For example, in LTE, data can be transmitted based on a unit of time called a Transmission Time Interval (TTI), which can be composed of one or more subframes. In LTE, a single subframe can be set to 1ms and contain 14 OFDM symbols (or 12 OFDM symbols).

[0114] In addition, a non-slot can be defined in NR. A non-slot can mean a slot that has at least one symbol less than a normal slot. For example, in the case of providing low latency, such as URLLC (Ultra-Reliable and Low Latency Communications) service, the latency can be reduced through a non-slot having a smaller number of symbols than a normal slot. At this time, the number of OFDM symbols included in a non-slot can be determined by considering the frequency range. For example, a non-slot with a length of 1 OFDM symbol can be considered in a frequency range of 6 GHz or higher. As another example, the number of OFDM symbols defining a non-slot can include at least 2 OFDM symbols. At this time, the range of the number of OFDM symbols included in a non-slot can be configured as the length of a mini-slot up to (the normal slot length)-1. However, as a specification of non-slot, the number of OFDM symbols may be limited to 2, 4, or 7 symbols, but is not limited to the above-described embodiment.

[0115] Also, for example, in unlicensed bands below 6 GHz, Subcarrier spacing corresponding to 1 and 2 is used, and in unlicensed bands above 6 GHz, In , subcarrier spacing corresponding to 3 and 4 can be used.

[0116] Additionally, Table 7 shows the subcarrier spacing settings for each case of a general CP. Number of OFDM symbols per slot . Table 7 shows the number of OFDM symbols per slot, the number of slots per frame, and the number of slots per subframe according to each subcarrier spacing value as provided in Table 6. In this case, Table 7 shows the above-described values ​​based on a general slot having 14 OFDM symbols.

[0117]

[0118] Also, as mentioned above, In the case of 2, extended CP can be applied when the subcarrier spacing is 60 kHz. Table 8 shows the number of OFDM symbols per slot in the case of extended CP. Each value can be represented based on a 12-person general slot. At this time, referring to Table 8, in the case of an extended CP following a 60 kHz subcarrier spacing, the number of symbols per slot, the number of slots per frame, and the number of slots per subframe can be represented.

[0119]

[0120] In addition, as described above, one subframe may correspond to 1ms on the time axis. In addition, one slot may correspond to 14 symbols on the time axis. In addition, as an example, one slot may correspond to 7 symbols on the time axis. Accordingly, the number of slots and symbols that can be considered within 10ms corresponding to one radio frame may be set differently. Table 9 may show the number of slots and the number of symbols according to each SCS. In this case, as an example, an SCS of 480KHz may not be considered in Table 9 below, and the present invention is not limited to the above-described embodiment.

[0121] Slots within 10ms Slots within 10ms Number of symbols within 10ms 15Khz 1020 140 30Khz 2040 280 60Khz 40 80 560 120Khz 80N / A 1120 240Khz 160N / A 2240 480Khz 320N / A 4480

[0122] Based on the NR system described above, a DMRS for V2X can be configured. For example, in existing V2X, a DMRS can be transmitted on a single antenna port corresponding to a single layer.

[0123] However, with regard to DMRS transmission for V2X, it may be possible to configure and transmit DMRS while maintaining orthogonality between multiple layers.

[0124] For example, the number of DMRS Orthogonal Antenna Ports that maintain orthogonality for V2X in an NR system may be 12. More specifically, in the NR system, all terminals may be distinguished into up to 12 layers in consideration of MU (Multi-User)-MIMO. For example, the DMRS antenna port numbers may be set to #0, #1, #2, #3, #4, #5, #6, #7, #8, #9, #10, #11. As another example, if the number of RS antenna ports corresponding to the first antenna port of the DMRS is A, the number of DMRS antenna ports may be "#A, #A+1, #A+2, #A+3, #A+4, #A+5, #A+6, #A+7, #A+8, #A+9, #A+10, #A+11".

[0125] At this time, the configuration for DMRS may be composed of DMRS Configuration Type 1 and DMRS Configuration Type 2. For example, DMRS Configuration Type 1 may be based on IFDMA (Interleaved Frequency Divisional Multiple Access), and DMRS Configuration Type 2 may be based on CDM (Code Division Multiplexing). However, the present invention is not limited to the above-described embodiment, and DMRS Configuration Type 1 and DMRS Configuration Type 2 may be distinguished from each other.

[0126] In addition, for example, when transmitting a DMRS, the DMRS can be transmitted using a single symbol. In another example, when transmitting a DMRS, the DMRS can be transmitted using two symbols. That is, when transmitting a DMRS, four cases can be considered based on the above-described DMRS configuration types and symbols used, as shown in Table 10 below. That is, for each DMRS configuration type, one case using a single symbol and two cases using two symbols can be considered.

[0127]

[0128] In addition, as an example, the antenna ports supported based on the above-described Table 10 may be as shown in Table 11 below. That is, based on the DMRS configuration type and number of symbols, they may be set as shown in Table 11 below, which will be described later in Tables 13 and 14 below. In this case, as an example,

[0129] can correspond to the number of symbols. That is, in the case of one symbol, If is 0 and there are two symbols, can be 0 or 1. Additionally, p can indicate a supported antenna port.

[0130]

[0131] In addition, as an example, based on Table 10 described above, the maximum layers that can be used in the case of SU (Single-User)-MIMO (Multiple Input Multiple Output) and MU (Multi-User)-MIMO may be as shown in Table 12 below. That is, based on SU-MIMO and MU-MIMO, it may be considered that the maximum number of DMRS layers that can be used per terminal is N. In this case, each layer may correspond to one of the DMRS antenna ports (12 antenna ports) described above.

[0132]

[0133] At this time, as an example, the DMRS configuration type 1 and DMRS configuration type 2 described above may determine the maximum distinguishable DMRS antenna ports based on Tables 13 and 14 below. As an example, in Table 13 below, may be an antenna port. At this time, the CDM group may differ depending on the DMRS configuration type described above, and Table 13 below may correspond to the DMRS configuration type 1 described above. For example, in the DMRS configuration type, the CDM group may be divided into two groups. In addition, as an example, the DMRS antenna port and can be determined by. At this time, in Table 13 may be a value set by the number of available symbols. More specifically, in the case of DMRS configuration type 1, when the number of available symbols is two, as in Table 13 below. this and We can consider the case where each symbol can be corresponded to. Therefore, for example, if the number of symbols is one, This may not be taken into account and cannot be used as a variable to distinguish DMRS antenna ports.

[0134] That is, if the DMRS setting type is 1 and the number of available symbols is one, in Table 13 below The values ​​can be set only from 0 to 3, and the maximum number of distinguishable DMRS antenna ports can be 4. Meanwhile, if the DMRS setting type is 1 and the number of available symbols is 2, as shown in Table 13 below. The values ​​can be set from 0 to 7, and the maximum possible DMRS antenna ports can be 8.

[0135]

[0136] Also, as an example, Table 14 may correspond to DMRS configuration type 2. As an example, in Table 14 below, may be an antenna port. At this time, the CDM group may vary depending on the DMRS configuration type described above, and Table 14 below may correspond to the DMRS configuration type 2 described above. For example, in the DMRS configuration type, the CDM group may be divided into three groups. In addition, as an example, the DMRS antenna port and can be determined by. At this time, in Table 14 may be a value set by the number of available symbols. More specifically, in the case of DMRS configuration type 2, when the number of available symbols is two, as in Table 14 below. this and We can consider the case where each symbol can be corresponded to. Therefore, for example, if the number of symbols is one, This may not be taken into account and cannot be used as a variable to distinguish DMRS antenna ports.

[0137] That is, if the DMRS setting type is 2 and the number of available symbols is one, then in Table 14 below The values ​​can be set only from 0 to 5, and the maximum number of distinguishable DMRS antenna ports can be 6. Meanwhile, if the DMRS setting type is 2 and the number of available symbols is two, as shown in Table 14 below, The values ​​can be set from 0 to 11, and the maximum number of distinguishable DMRS antenna ports can be 12.

[0138]

[0139] As a specific example, when using one symbol in DMRS configuration type 1, up to four DMRS antenna ports can be distinguished. As an example, DMRS configuration type 1 can be configured based on IFDMA. At this time, in the frequency domain, "Comb Pattern A (corresponding to CDM group 0 in Table 13, allocated to #0, #2, #4, #6, #8, #10 among 12 subcarriers (#0 to #11) in one PRB (since every two subcarriers are allocated from #0, Δ=0))" and "Comb Pattern B (corresponding to CDM group 1 in Table 13, allocated to #1, #3, #5, #7, #9, #11 among 12 subcarriers (#0 to #11) in one PRB (since every two subcarriers are allocated from #1, Δ=1))" can be set for each of the 12 subcarriers as one PRB (Physical Resource Block). At this time, the DMRS pattern can be extended by repeating multiple PRBs in the frequency axis as much as the bandwidth allocated for transmission of each terminal's physical channel (e.g., PDSCH, PUSCH, etc.). In addition, it can be applied to each DMRS configuration within a single slot in the time axis. For example, the DMRS configuration can be a "front-loaded DMRS configuration" as a fixed location or an "additional DMRS configuration" as an additional configuration, and is not limited to the above-described embodiment.

[0140] At this time, as an example, one PRB contains 12 REs (Resource Elements), and 6 REs can be allocated per comb pattern for one symbol.

[0141] At this time, the DMRS antenna port configuration may be as shown in Table 15 below. For example, in Table 15 below, the Comb pattern may be the "Comb pattern A" or "Comb pattern B" described above. However, this means different Comb patterns and is not limited to the above-described names. In addition, when CS (Cyclic Shift) is a cyclic delay value of a DMRS sequence and the possible values ​​range from 0 to X, "CS value A" may have a value of 0 and "CS value B" may have a value of X / 2. For example, when X=12, "CS value A" may have a value of 0 and "CS value B" may have a value of 6. In addition, as an example, when X=2π, "CS value A" may have a value of 0 and "CS value B" may have a value of π, but is not limited thereto. That is, when using one symbol as DRMS ​​setting type 1, it can be distinguished first by CS value and then by Comb pattern.

[0142] Additionally, as an example, in Table 15 below, DMRS antenna ports #0 and #1 may be assigned to "Comb pattern A." Additionally, DMRS antenna ports #2 and #3 may be assigned to "Comb pattern B," and are not limited to the above-described embodiments.

[0143] Comb patternCS(Cyclic Shift)DMRS antenna port #0Comb pattern ACS value ADMRS antenna port #1Comb pattern ACS value BDMRS antenna port #2Comb pattern BCS value ADMRS antenna port #3Comb pattern BCS value B

[0144] As another example, consider a case where the DMRS configuration type is 1 and the number of available symbols is two. In this case, "Comb Pattern A" and "Comb Pattern B" can be configured in two symbols and 12 subcarriers (corresponding to one PRB in the frequency domain), and similarly, they can be configured alternately for each subcarrier. In this case, the DMRS pattern can be extended by repeating it to multiple PRBs as much as the bandwidth allocated for transmission of physical channels (e.g., PDSCH, PUSCH, etc.) of each terminal in the frequency axis. In addition, it can be applied to each DMRS configuration within one slot in the time axis. For example, the DMRS configuration can be a "Front-loaded DMRS configuration" as a fixed position or an "Additional DMRS configuration" as an additional configuration, and is not limited to the above-described embodiment.

[0145] At this time, a total of 6 REs (Resource Elements) can be allocated per comb pattern for one symbol in one PRB. The configuration of the DMRS antenna port can be as shown in Table 16 below. In Table 16 below, the comb pattern is "Comb pattern A" or "Comb pattern B", and the CS (Cyclic Shift) is a cyclic delay value of the DMRS sequence. If the range of possible values ​​is 0 to X, "CS value A" can be 0. In addition, "CS value B" can be X / 2. For example, when X=12, "CS value A" can be 0 and "CS value B" can be 6. When X=2π, "CS value A" can be 0 and "CS value B" can be π, but is not limited thereto.

[0146] In addition, TD-OCC (Time Domain-Orthogonal Cover Code) can be applied to two REs that are adjacent in time on the same subcarrier within each comb pattern. At this time, when generating a DMRS sequence, +1 or -1 can be multiplied to the sequence value of the DMRS sequence mapped to the corresponding RE. More specifically, the DMRS sequence value can be multiplied as [+1, +1] or [+1, -1] for the RE that is prioritized in time on the same subcarrier and the RE that is next in time on the same subcarrier.

[0147] That is, when two symbols are used as DRMS ​​setting type 1, they can be distinguished first by CS value, then by Comb pattern, and finally by TD-OCC. In addition, as an example, DMRS antenna ports #0, #1, #4, #5 can be assigned to "Comb pattern A", and DMRS antenna ports #2, #3, #6, #7 can be set to "Comb pattern B", and the present invention is not limited to the above-described embodiment.

[0148]

[0149] As another example, consider a case where the DMRS configuration type is 2 and uses one symbol. At this time, in one symbol and 12 subcarriers (corresponding to one PRB in the frequency domain), "CDM group A (corresponding to CDM group 0 in Table 14, allocated to #0, #1, #6, #7 among 12 subcarriers (#0 to #11) in one PRB (since every 6 subcarriers are allocated from #0 and #1, Δ=0))", "CDM group B (corresponding to CDM group 1 in Table 14, allocated to #2, #3, #8, #9 among 12 subcarriers (#0 to #11) in one PRB (since every 6 subcarriers are allocated from #2 and #3, Δ=2))", "CDM group C (corresponding to CDM group 2 in Table 14, allocated to #4, #5, #10, #11 among 12 subcarriers (#0 to #11) in one PRB (since every 6 subcarriers are allocated from #4 and Since it is allocated every 6 subcarriers from #5, Δ=4))" can be distinguished. At this time, it means that three CDM groups can be set, and is not limited to the above-described name. At this time, the DMRS pattern can be extended by repeating multiple PRBs as much as the bandwidth allocated for transmission of the physical channel (e.g., PDSCH, PUSCH, etc.) of each terminal in the frequency axis. In addition, it can be applied to each DMRS configuration within one slot in the time axis. For example, the DMRS configuration can be a "Front-loaded DMRS configuration" as a fixed position or an "Additional DMRS configuration" as an additional configuration, and is not limited to the above-described embodiment.

[0150] At this time, since each CDM group has three, a total of four REs can be allocated per CDM group. For example, when using one symbol in the above-described DMRS configuration type 2, the DMRS antenna port can be configured as shown in Table 17 below. At this time, the CDM group below can be "CDM group A", "CDM group B", or "CDM group C". In addition, as an example, FD-OCC (Frequency Domain-Orthogonal Cover Code) can be applied to two REs adjacent on the frequency axis in the same symbol within each CDM group. The value is [+1, +1] or [+1, -1], and when generating a DMRS sequence, +1 or -1 is multiplied by the sequence value of the DMRS sequence mapped to the corresponding RE. That is, the above-described value can be set based on the RE that has priority on the frequency axis in the same symbol and the next RE on the frequency axis in the same symbol. That is, when using one symbol in DMRS configuration type 2, it can be first distinguished by FD-OCC and then distinguished by CDM group. At this time, as an example, "CDM group A" may have DMRS antenna ports #0 and #1 set, "CDM group B" may have DMRS antenna ports #2 and #3 set, and "CDM group C" may have DMRS antenna ports #4 and #5 set, but is not limited to the above-described embodiment.

[0151] CDM groupFD-OCCDMRS antenna port #0CDM group A[+1, +1]DMRS antenna port #1CDM group A[+1, -1]DMRS antenna port #2CDM group B[+1, +1]DMRS antenna port #3CDM group B[+1, -1]DMRS antenna port #4CDM group C[+1, +1]DMRS antenna port #5CDM group C[+1, -1]

[0152] Also, for example, when two symbols are used in DMRS configuration type 2, up to 12 DMRS antenna ports can be distinguished. For example, "CDM group A", "CDM group B", and "CDM group C" can be configured in two symbols and 12 subcarriers (corresponding to one PRB in the frequency domain). That is, three CDM groups can be configured, and the present invention is not limited to the above-described names. At this time, the DMRS pattern can be extended by repeating multiple PRBs as much as the bandwidth allocated for transmission of physical channels (e.g., PDSCH, PUSCH, etc.) of each terminal in the frequency axis. In addition, the DMRS pattern can be applied to each DMRS configuration within one slot in the time axis. For example, the DMRS configuration can be a "Front-loaded DMRS configuration" as a fixed position or an "Additional DMRS configuration" as an additional configuration, and is not limited to the above-described embodiment.

[0153] At this time, since each CDM group has three, a total of four REs can be allocated per CDM group. For example, when using one symbol in the above-described DMRS configuration type 2, the DMRS antenna port can be configured as shown in Table 18 below. At this time, in Table 18 below, the CDM group can be "CDM group A", "CDM group B", or "CDM group C".

[0154] In addition, FD-OCC (Frequency Domain-Orthogonal Cover Code) can be applied to two REs adjacent on the frequency axis in the same symbol within each CDM group. The value is [+1, +1] or [+1, -1], and when generating a DMRS sequence, +1 or -1 is multiplied by the sequence value of the DMRS sequence mapped to the corresponding RE. That is, the sequence value of the DMRS sequence described above is multiplied for the RE that has priority on the frequency axis in the same symbol and the next RE on the frequency axis in the same symbol.

[0155] Additionally, TD-OCC (Time Domain-Orthogonal Cover Code) can be applied to two REs that are adjacent in time on the same subcarrier. The value is [+1, +1] or [+1, -1], and when generating a DMRS sequence, +1 or -1 is multiplied by the sequence value of the DMRS sequence mapped to the corresponding RE. In other words, the sequence value of the DMRS sequence described above is multiplied for the RE that is prioritized in time on the same subcarrier and the RE that is next in time on the same subcarrier.

[0156] That is, when two symbols are used in DMRS configuration type 2, they may be first distinguished by FD-OCC, then distinguished by CDM group, and finally distinguished by TD-OCC. At this time, as an example, DMRS antenna ports #0, #1, #6, #7 may be set for "CDM group A", DMRS antenna ports #2, #3, #8, #9 may be set for "CDM group B", and DMRS antenna ports #4, #5, #10, #11 may be set for "CDM group C", and the present invention is not limited to the above-described embodiment.

[0157] CDM groupFD-OCCTD-OCCDMRS antenna port #0CDM group A[+1, +1][+1, +1]DMRS antenna port #1CDM group A[+1, -1][+1, +1]DMRS antenna port #2CDM group B[+1, +1][+1, +1]DMRS antenna port #3CDM group B[+1, -1][+1, +1]DMRS antenna port #4CDM group C[+1, +1][+1, +1]DMRS antenna port #5CDM group C[+1, -1][+1, +1]DMRS antenna port #6CDM group A[+1, +1][+1, -1]DMRS antenna port #7CDM group A[+1, -1][+1, -1]DMRS antenna port #8CDM group B[+1, +1][+1, -1]DMRS antenna port #9CDM group B[+1, -1][+1, -1]DMRS antenna port #10CDM group C[+1, +1][+1, -1]DMRS antenna port #11CDM group C[+1, -1][+1, -1]

[0158] Hereinafter, a method of configuring DMRS for PSCCH and DMRS for PSSCH considering NR V2X is described. As an example, DMRS for PSSCH may be configured based on the above-described method. In addition, as an example, DMRS for PSCCH as a control channel may be configured based on PUCCH format 2. In this case, Table 19 below may be a resource allocation method for PUCCH format 2. As an example, referring to Table 19 below, in PUCCH format 2, k may indicate a relative position compared to subcarrier 0 of a resource block. In this case, k may be set to a value of “3m+1”. That is, k may be set to a fixed position in the frequency domain according to m, so that resources may be mapped to fixed positions. In this case, DMRS for PSCCH may also be set to fixed positions in the frequency domain, similar to PUCCH format 2. That is, DMRS for PSCCH can be set to a fixed position using the k value described above based on the PUCCH format 2 method. However, configuring DMRS for PSCCH based on PUCCH format 2 is only one example, and it can be configured using other methods. For example, DMRS for PSCCH can also be set to a fixed position based on other methods, and is not limited to the above-described embodiment.

[0159] Mapping to physical resources

[0160] Additionally, as an example, in NR V2X, PSCCH and PSSCH can be distinguished symbol-by-symbol in the time domain based on FDM. That is, PSCCH and PSSCH can be allocated symbol-by-symbol in the same subframe. As a specific example, FIGS. 7 to 10 can illustrate how PSCCH and PSSCH are allocated.

[0161] At this time, FIG. 7 is a diagram showing a method in which a DMRS for a PSCCH is configured with one symbol, and a DRMS ​​for a PSSCH is configured with one symbol based on a “Front-loaded DMRS”. As an example, referring to FIG. 7, different allocation types may be set based on whether a frequency region to which a PSCCH is allocated and a frequency region to which a PSSCH is allocated are the same. At this time, in FIG. 7(A), as Type 1, the frequency region to which a PSCCH is allocated and the frequency region to which a PSSCH is allocated may be different. On the other hand, in FIG. 7(B), as Type 2, the frequency region to which a PSCCH is allocated and the frequency region to which a PSSCH is allocated may be the same. In addition, as an example, in the case of the above-described Type 1, other frequency regions than the frequency region to which a PSCCH is allocated may be left empty or other channels may be allocated. On the other hand, in FIG. 7(C) and FIG. 7(D), as Type 3, a PSSCH can be additionally allocated to an empty space other than the frequency domain to which the PSCCH is allocated. That is, data can be transmitted through an empty space other than the frequency domain to which the PSCCH is allocated. In this case, as an example, in FIG. 7(C), as Type 3-1, only the PSSCH can be allocated to a domain other than the frequency domain to which the PSCCH is allocated. That is, a DMRS for the PSSCH may not be allocated. On the other hand, in FIG. 7(D), as Type 3-2, the PSSCH and the DMRS for the PSSCH can be allocated to a domain other than the frequency domain to which the PSCCH is allocated. In this case, a method for configuring a DMRS for the PSCCH and a DMRS for the PSSCH based on the above-described allocation method may be required, and this will be described later. In addition, as an example, the above-described type is only one example, and allocation may be possible in other types, and is not limited to the above-described embodiment.

[0162] In addition, as an example, considering the type 3-1 of Fig. 7(C) and the type 3-2 of Fig. 7(D), in the case of type 3-2 of Fig. 7(D), the PSSCH DMRS can be allocated from the first symbol, so fast decoding for the PSSCH can be possible. In addition, as an example, considering the type 3-1 of Fig. 7(C) and the type 3-2 of Fig. 7(D), in the case of type 3-2 of Fig. 7(D), the resources for the PSSCH DMRS share the PSCCH DMRS resources, so resources for the PSSCH DMRS can be saved. As another example, in the case of non-slot based allocation, DMRS allocation can be efficient in the case of type 3-2 of Fig. 7(D), and is not limited to the above-described embodiment. For example, a non-slot may refer to a slot with at least one symbol less than a normal slot, and in this case, DMRS allocation may be efficient. For example, in the case of a non-slot with two symbols, DMRS allocation needs to be based on the aforementioned Type 3-2.

[0163] Also, as an example, FIG. 8 is a diagram illustrating a method in which a DMRS for a PSCCH is configured with two symbols and a DRMS ​​for a PSSCH is configured with one symbol based on a “Front-loaded DMRS”. As an example, referring to FIG. 8, different allocation types may be set based on whether a frequency region to which a PSCCH is allocated and a frequency region to which a PSSCH is allocated are the same. At this time, FIG. 8(A) is Type 1, and the frequency region to which a PSCCH is allocated and the frequency region to which a PSSCH is allocated may be different. On the other hand, FIG. 8(B) is Type 2, and the frequency region to which a PSCCH is allocated and the frequency region to which a PSSCH is allocated may be the same. At this time, a PSCCH may be allocated to two symbols, and a PSSCH may be allocated to one symbol. Also, as an example, in the case of the above-described Type 1, other frequency regions than the frequency region to which a PSCCH is allocated may be left empty or other channels may be allocated. On the other hand, in FIG. 8(C) and FIG. 8(D), as Type 3, a PSSCH can be additionally allocated to an empty space other than the frequency domain to which the PSCCH is allocated. That is, data can be transmitted through an empty space other than the frequency domain to which the PSCCH is allocated. In this case, as an example, in FIG. 8(C), as Type 3-1, only the PSSCH can be allocated to an area other than the frequency domain to which the PSCCH is allocated. That is, the DMRS for the PSSCH may not be allocated. On the other hand, in FIG. 8(D), as Type 3-2, the PSSCH and the DMRS for the PSSCH can be allocated to an area other than the frequency domain to which the PSCCH is allocated. However, the DMRS for the PSSCH is allocated to only one symbol, so the PSSCH and the DMRS for the PSSCH can be allocated to only one of the two symbols to which the PSCCH is allocated. At this time, a method of configuring DMRS for PSCCH and DMRS for PSSCH based on the above-described allocation method may be required, which will be described later.

[0164] In addition, as an example, considering the type 3-1 of Fig. 8(C) and the type 3-2 of Fig. 8(D), in the case of type 3-2 of Fig. 8(D), the PSSCH DMRS can be allocated from the first symbol, so fast decoding for the PSSCH can be possible. In addition, as an example, considering the type 3-1 of Fig. 8(C) and the type 3-2 of Fig. 8(D), in the case of type 3-2 of Fig. 8(D), the resources for the PSSCH DMRS share the PSCCH DMRS resources, so resources for the PSSCH DMRS can be saved. As another example, in the case of non-slot based allocation, DMRS allocation can be efficient in the case of type 3-2 of Fig. 8(D), and is not limited to the above-described embodiment. For example, a non-slot may refer to a slot with at least one symbol less than a normal slot, and in this case, DMRS allocation may be efficient. For example, in the case of a non-slot with two symbols, DMRS allocation needs to be based on the aforementioned Type 3-2.

[0165] In addition, FIG. 9 is a diagram showing a method in which a DMRS for a PSCCH is configured with one symbol and a DRMS ​​for a PSSCH is configured with two symbols based on a “Front-loaded DMRS”. As an example, referring to FIG. 9, different allocation types may be set based on whether a frequency region to which a PSCCH is allocated and a frequency region to which a PSSCH is allocated are the same. In this case, in FIG. 9(A), as Type 1, the frequency region to which a PSCCH is allocated and the frequency region to which a PSSCH is allocated may be different. On the other hand, in FIG. 9(B), as Type 2, the frequency region to which a PSCCH is allocated and the frequency region to which a PSSCH is allocated may be the same. In addition, as an example, in the case of the above-described Type 1, other frequency regions than the frequency region to which a PSCCH is allocated may be left empty or other channels may be allocated. On the other hand, in FIG. 9(C) and FIG. 9(D), as Type 3, a PSSCH can be additionally allocated to an empty space other than the frequency domain to which the PSCCH is allocated. That is, data can be transmitted through an empty space other than the frequency domain to which the PSCCH is allocated. At this time, as an example, in FIG. 9(C), as Type 3-1, only the PSSCH can be allocated to a region other than the frequency domain to which the PSCCH is allocated. That is, the DMRS for the PSSCH may not be allocated. On the other hand, in FIG. 9(D), as Type 3-2, the PSSCH and the DMRS for the PSSCH can be allocated to a region other than the frequency domain to which the PSCCH is allocated. At this time, the DMRS for the PSSCH is allocated to two symbols, and can be allocated in the symbol to which the PSCCH is allocated and the following symbol. Based on the above-described allocation method, a method for configuring a DMRS for the PSCCH and a DMRS for the PSSCH may be required, which will be described later.

[0166] In addition, as an example, considering the type 3-1 of Fig. 9(C) and the type 3-2 of Fig. 9(D), in the case of type 3-2 of Fig. 9(D), the PSSCH DMRS can be allocated from the first symbol, so fast decoding for the PSSCH can be possible. In addition, as an example, considering the type 3-1 of Fig. 9(C) and the type 3-2 of Fig. 9(D), in the case of type 3-2 of Fig. 9(D), the resources for the PSSCH DMRS share the PSCCH DMRS resources, so resources for the PSSCH DMRS can be saved. As another example, in the case of non-slot based allocation, DMRS allocation can be efficient in the case of type 3-2 of Fig. 9(D), and is not limited to the above-described embodiment. For example, a non-slot may refer to a slot with at least one symbol less than a normal slot, and in this case, DMRS allocation may be efficient. For example, in the case of a non-slot with two symbols, DMRS allocation needs to be based on the aforementioned Type 3-2.

[0167] In addition, FIG. 10 is a diagram showing a method in which a DMRS for a PSCCH is configured with two symbols, and a DRMS ​​for a PSSCH is configured with two symbols based on a “Front-loaded DMRS”. As an example, referring to FIG. 10, different allocation types may be set based on whether a frequency region to which a PSCCH is allocated and a frequency region to which a PSSCH is allocated are the same. In this case, FIG. 10(A) is Type 1, and the frequency region to which a PSCCH is allocated and the frequency region to which a PSSCH is allocated may be different. On the other hand, FIG. 10(B) is Type 2, and the frequency region to which a PSCCH is allocated and the frequency region to which a PSSCH is allocated may be the same. In addition, as an example, in the case of the above-described Type 1, other frequency regions other than the frequency region to which a PSCCH is allocated may be left empty or other channels may be allocated. On the other hand, in FIG. 10(C) and FIG. 10(D), as Type 3, a PSSCH can be additionally allocated to an empty space other than the frequency domain to which the PSCCH is allocated. That is, data can be transmitted through an empty space other than the frequency domain to which the PSCCH is allocated. In this case, as an example, in FIG. 10(C), as Type 3-1, only the PSSCH can be allocated to an area other than the frequency domain to which the PSCCH is allocated. That is, a DMRS for the PSSCH may not be allocated. On the other hand, in FIG. 10(D), as Type 3-2, a PSSCH and a DMRS for the PSSCH can be allocated to an area other than the frequency domain to which the PSCCH is allocated. In this case, a method for configuring a DMRS for the PSCCH and a DMRS for the PSSCH based on the above-described allocation method may be required, which will be described later.

[0168] In addition, as an example, considering the type 3-1 of Fig. 10(C) and the type 3-2 of Fig. 10(D), in the case of type 3-2 of Fig. 10(D), the PSSCH DMRS can be allocated from the first symbol, so fast decoding for the PSSCH can be possible. In addition, as an example, considering the type 3-1 of Fig. 10(C) and the type 3-2 of Fig. 10(D), in the case of type 3-2 of Fig. 10(D), the resources for the PSSCH DMRS share the PSCCH DMRS resources, so resources for the PSSCH DMRS can be saved. As another example, in the case of non-slot based allocation, DMRS allocation can be efficient in the case of type 3-2 of Fig. 10(D), and is not limited to the above-described embodiment. For example, a non-slot may refer to a slot with at least one symbol less than a normal slot, and in this case, DMRS allocation may be efficient. For example, if a non-slot has two symbols, DMRS allocation may need to be based on the Type 3-2 described above.

[0169] In the above-described FIGS. 7 to 10, a method for configuring a DMRS for a PSCCH and a DMRS for a PSSCH may be required. For example, the PSCCH DMRS and the PSCCH DMRS may be configured separately. In this case, in the case of Type 1, Type 2, and Type 3-1 in FIGS. 7 to 10, respectively, the DMRS for the PSCCH and the DMRS for the PSSCH are not allocated to the same symbol, so the PSCCH DMRS and the PSCCH DMRS may be configured and applied separately.

[0170] More specifically, referring to FIG. 11, when PSCCH DMRS and PSCCH DMRS are configured separately, the PSCCH DMRS allocation pattern can be set to a fixed pattern. In this case, for example, based on Table 19 described above, the PSCCH DMRS allocation pattern can be allocated to a fixed location based on PUCCH format 2. However, this is only one example, and the PSCCH DMRS allocation pattern can be set to a fixed pattern based on another method. In this case, as described above, the DMRS can be set in a way that distinguishes antenna ports. However, as an example, a case where MIMO is not supported in NR V2X can be considered. As an example, a case where SU-MIMO is not considered can be considered. In this case, “[+1, +1, +1, +1]” can be set as an orthogonal sequence for a total of four REs within the same symbol in one PRB. That is, there is no need to distinguish antenna ports for DMRS, and the values ​​described above can be set identically as orthogonal sequences.

[0171] On the other hand, as an example, a case where MIMO is supported in NR V2X can be considered. As an example, a case where SU-MIMO is considered can be considered. At this time, as an example, a case where two antenna ports are supported considering transmit diversity can be considered. At this time, in order to distinguish the antenna ports, for the first antenna port, “[+1, +1, +1, +1]” may be set as an orthogonal sequence for a total of four REs within the same symbol within one PRB. In addition, for the second antenna port, in order to distinguish the antenna ports, “[+1, -1, +1, -1]” may be set as an orthogonal sequence for a total of four REs within the same symbol within one PRB. In other words, two types of orthogonal sequence settings may be possible to distinguish the two antenna ports.

[0172] On the other hand, the PSSCH DMRS allocation pattern may consider the aforementioned DMRS Configuration Type 2. At this time, the PSSCH DMRS allocation pattern may be determined based on an ID value. At this time, the ID value may be an SCI (Sidelink Control Information) ID. In addition, the ID value may be another ID value and is not limited to the above-described embodiment. Meanwhile, the SCI ID may be confirmed through the PSCCH. That is, the SCI ID may be transmitted by being included in the PSCCH.

[0173] At this time, for example, the SCI ID may be an ID set in the physical layer considering unicast or groupcast transmission (e.g., sidelink layer-1 (SL Layer-1) ID). At this time, for example, the SL Layer-1 ID may be set to ensure the reliability of NR V2X communication based on unicast or groupcast in NR V2X and to satisfy low-latency requirements. For example, since LTE V2X only supports broadcast transmission, the SL Layer-1 ID value could be determined and used based on the 16-bit CRC (Cyclic Redundancy Code) information attached to the SCI information in the PSCCH. In addition, for example, in LTE D2D, the SL Layer-1 ID value could be utilized in the physical channel based on the destination ID (Destination ID (for layer-1)) that the transmitting terminal provides to the receiving terminal in the SCI information. However, unlike existing scenarios, multiple unicasts and / or groupcasts may exist in NR V2X. In addition, there is a need to support data transmission with high QoS (Quality of Service) requirements in NR V2X at the physical layer. At this time, in order to satisfy the above-described QoS requirements, information on HARQ (Hybrid Automatic Repeat Request) and CSI (Channel State Information) may be required in consideration of link adaptation. In addition, for example, other operations may be required to satisfy the QoS requirements, and are not limited to the above-described embodiment. At this time, in consideration of the above-described operations, there is a need to set an SL Layer-1 ID for SL unicast or groupcast transmission. That is, the terminal can additionally perform unicast or groupcast transmission along with the existing broadcast-based SL transmission.Additionally, for example, unicast transmission may use traffic requiring high reliability and delay time, and when V2X services are provided, there may be many terminal pairs (UE pairs for unicast). In this case, as described above, there is a need for various forms of SL communication to satisfy higher QoS requirements within a limited communication range, and reliable transmission may also be required at the physical layer.

[0174] Considering the above, an SL Layer-1 ID value can be defined and utilized. For example, the SL Layer-1 ID can be determined based on at least one of a "layer-1 destination ID", a "layer-1 source ID", a "HARQ process ID", and "CRC bits of associated PSCCH". In addition, for example, the SL Layer-1 ID can be set as a layer-1 link ID by a combination of two or more of the "layer-1 destination ID", the "layer-1 source ID", the "HARQ process ID", and the "CRC bits of associated PSCCH". In another example, the layer-1 link ID can be set as a part of a layer-2 link ID. For example, the layer-2 link ID can be generated when a unicast and / or groupcast session is established. In this case, the layer-1 link ID can be generated and set as a part of the layer-2 link ID, and is not limited to the above-described embodiment.

[0175] That is, an SL Layer-1 ID for the physical layer can be set, and the SL Layer-1 ID can be an SCI ID. In the following, the above-described ID is referred to as an SCI ID. That is, the SCI ID can refer to an SL Layer-1 ID for the physical layer, but the setting method is not limited to the above-described one.

[0176] At this time, the PSSCH DMRS allocation pattern may also be set differently based on whether MIMO is supported in NR V2X. For example, a case in which MIMO is not supported in NR V2X may be considered. For example, a case in which SU-MIMO is not considered may be considered. At this time, referring to FIG. 11, in the case in which MIMO is not supported, the DMRS pattern may be determined based on any one of Tables 20 to 22 below.

[0177]

[0178]

[0179]

[0180] On the other hand, as an example, we can consider a case where MIMO is supported in NR V2X. As an example, we can consider a case where SU-MIMO is considered. In this case, as an example, we can consider a case where two antenna ports are supported to consider transmit diversity. In this case, to distinguish the antenna ports, the first antenna port and the second antenna port can be distinguished based on an orthogonal sequence, as shown in Table 23 below.

[0181]

[0182] FIG. 11 and Tables 20 to 23 describe the case where a DMRS is assigned to a single symbol. For example, if a DMRS is assigned to two symbols, the allocation methods described in FIG. 11 and Tables 20 to 23 may be applied in the same manner. That is, in the case of two symbols, DMRS allocation may be repeated and is not limited to the above-described embodiment.

[0183] At this time, for example, when PSCCH DMRS and PSSCH DMRS are configured separately, the DMRS sequence can be determined based on the following mathematical expression 3. For example, PSCCH DMRS can be consecutively allocated to PRBs to which PSCCH is allocated for each symbol. At this time, for example, the initial value can be as shown in the following mathematical formula 4. At this time, can be indicated via RRC signaling. On the other hand, for example, A fixed value may be used if not indicated by RRC signaling.

[0184] [Equation 3]

[0185]

[0186]

[0187] [Equation 4]

[0188]

[0189]

[0190] Also, for example, the PSSCH DMRS allocation location can change and the initial value may be as shown in the following mathematical expression 5. At this time, as an example, the PSSCH DMRS may be consecutively allocated to PRBs to which the PSSCH is allocated for each symbol. At this time, can be indicated via RRC signaling. On the other hand, for example, If not indicated by RRC signaling, the SCI ID may be used as described above.

[0191] Through this, DMRS allocation patterns can be directed. In addition, If signaling exists, can be directed through the SCI field. On the other hand, If no signaling exists, can be set to 0 and is not limited to the embodiments described above.

[0192] [Equation 5]

[0193]

[0194]

[0195] As another example, a case where PSCCH DMRS and PSSCH DMRS are configured simultaneously can be considered. For example, the case of Type 3-2 in each of FIGS. 7 to 10 described above can be considered. That is, when PSCCH DMRS and PSSCH DMRS are allocated to the same symbol, PSCCH DMRS and PSSCH DMRS can be configured simultaneously. However, the method of configuring PSCCH DMRS and PSSCH DMRS simultaneously can be equally applied to Type 1, Type 2, and Type 3-1 in each of FIGS. 7 to 10 described above, and the above-described types are not excluded.

[0196] At this time, considering each of Type 3-2 of FIGS. 7 to 10, the terminal can preferentially partially decode the PSCCH DMRS and then decode the PSCCH. At this time, information about the pattern for the PSCCH DMRS can be preset. Furthermore, for example, information about the pattern for the PSCCH DMRS can be indicated in advance through signaling. At this time, since the SCI ID is information included in the PSCCH, the terminal can know the SCI ID when decoding the PSCCH. Next, the PSSCH can be channel-estimated through a DMRS sequence that is consecutively allocated by considering both the PSCCH DMRS part and the PSSCH DMRS part. Based on the above, the terminal can confirm the DMRS allocation pattern through the SCI ID, and the PSSCH can be decoded through a DMRS sequence that is consecutively allocated by considering both the PSCCH DMRS part and the PSSCH DMRS part based on the confirmed DMRS allocation pattern. That is, the terminal can perform decoding in two steps. At this time, since the PSCCH DMRS pattern is a fixed pattern, the terminal can perform decoding for the PSSCH through two-step decoding as described above without performing blind decoding.

[0197] At this time, as an example, as in the above-described FIG. 11, the PSCCH DMRS and PSSCH DMRS overheads may be the same, but the PSCCH DMRS pattern and the PSSCH DMRS pattern may be different. That is, the PSCCH DMRS pattern may be set differently from the PSSCH DMRS pattern as a fixed pattern. For example, the PSCCH DMRS allocation pattern is a fixed pattern as described above, and when MIMO is not considered, the orthogonal sequence "[+1, +1, +1, +1]" may be set for a total of four REs within the same symbol within one PRB, which may be the same as described above. On the other hand, when two antenna patterns are set for the PSCCH DMRS allocation pattern in consideration of MIMO, the first antenna port may be set to the orthogonal sequence "[+1, +1, +1, +1]" for a total of four REs within the same symbol within one PRB. Additionally, the second antenna port can be set to the orthogonal sequence "[+1, -1, +1, -1]" for a total of four REs within the same symbol within one PRB. That is, the antenna ports can be distinguished through the orthogonal sequence, which can be the same as described above.

[0198] Additionally, as described above, the PSSCH DMRS allocation pattern may also be configured differently based on whether MIMO is supported in NR V2X. For example, a case in which MIMO is not supported in NR V2X may be considered. In this case, referring to FIG. 11 described above, in the case in which MIMO is not supported, the DMRS pattern may be determined based on any one of Tables 24 to 26 below.

[0199]

[0200]

[0201]

[0202] On the other hand, as an example, we can consider a case where MIMO is supported in NR V2X. As an example, we can consider a case where SU-MIMO is considered. In this case, as an example, we can consider a case where two antenna ports are supported considering transmit diversity. In this case, to distinguish the antenna ports, the first antenna port and the second antenna port can be distinguished based on an orthogonal sequence as shown in Table 27 below, as described above.

[0203]

[0204] Also, as an example, the PSCCH DMRS pattern and the PSSCH DMRS pattern may be the same as in FIG. 12. At this time, when comparing the PSCCH DMRS pattern of FIG. 12 with the PSCCH DMRS pattern of FIG. 11, the PSCCH DMRS pattern of FIG. 12 may be efficient when applying OCC. That is, since OCC can be applied smoothly to adjacent DMRS, the PSCCH DMRS pattern of FIG. 12 may be efficient. Referring to FIG. 12, the PSCCH DMRS pattern may be set to be the same as the PSSCH DMRS pattern as a fixed pattern. As an example, the PSCCH DMRS allocation pattern is a fixed pattern as described above, and when MIMO is not considered, an orthogonal sequence "[+1, +1, +1, +1]" may be set for a total of four REs within the same symbol in one PRB, which may be the same as described above. On the other hand, when two antenna patterns are set considering MIMO in the PSCCH DMRS allocation pattern, the first antenna port may be set to an orthogonal sequence "[+1, +1, +1, +1]" for a total of four REs within the same symbol within one PRB. In addition, the second antenna port may be set to an orthogonal sequence "[+1, -1, +1, -1]" for a total of four REs within the same symbol within one PRB. That is, the antenna ports may be distinguished through orthogonal sequences, which may be the same as described above.

[0205] Additionally, as described above, the PSSCH DMRS allocation pattern may also be configured differently based on whether MIMO is supported in NR V2X. For example, a case in which MIMO is not supported in NR V2X may be considered. In this case, referring to FIG. 12, in the case in which MIMO is not supported, the DMRS pattern may be determined based on any one of Tables 28 to 30 below.

[0206]

[0207]

[0208]

[0209] On the other hand, as an example, we can consider a case where MIMO is supported in NR V2X. As an example, we can consider a case where SU-MIMO is considered. In this case, as an example, we can consider a case where two antenna ports are supported considering transmit diversity. In this case, in order to distinguish the antenna ports, the first antenna port and the second antenna port can be distinguished based on an orthogonal sequence as shown in Table 31 below, as described above.

[0210]

[0211] Meanwhile, for example, the PSCCH DMRS may have a position that varies differently from that described above. In this case, considering each of Type 3-2 of FIGS. 7 to 10, the PSCCH DMRS pattern position may vary into three types, like the PSSCH DMRS pattern, depending on the SCI ID. Therefore, channel estimation of the PSCCH and PSSCH may be possible by simultaneously decoding the PSCCH DMRS and the PSSCH DMRS. That is, since the PSCCH DMRS and the PSSCH DMRS are simultaneously decoded, decoding may be performed at once without requiring two stages of decoding as described above. However, since the SCI ID is information included in the PSCCH and the UE cannot confirm it, blind decoding may be performed for the PSCCH DMRS. In addition, for example, the SCI ID transmitted through the PSCCH can only transmit an integer value of (SCI ID) / 3 (i.e., int((SCI ID) / 3), so that the transmission bit value may be reduced.

[0212] At this time, as an example, referring to FIG. 13, as described above, the position of the PSCCH DMRS may be changed like the PSSCH DMRS, but the patterns of the PSCCH DMRS and the PSSCH DMRS may be different. For example, the overhead of the PSCCH DMRS and the PSSCH DMRS may be the same, but the patterns may be different as in FIG. 13. For example, the position of the PSCCH DMRS may be set as shown in Tables 32 and 33 below, considering DMRS Configuration type 2 as described above, in order to make the overhead the same as that of the PSSCH. For example, Table 32 is a case where MIMO is not considered, and the orthogonal sequences may be set identically. On the other hand, Table 33 is a case where MIMO is considered, and may be a method based on a case where two antenna ports are distinguished. At this time, as an example, when SU-MIMO is considered, only the PSSCH DMRS may be considered for SU-MIMO. At this time, for example, in the case described above, PSCCH DMRS may be allocated based on Table 32 described above, and is not limited to the embodiment described above.

[0213]

[0214]

[0215] As another example, referring to FIG. 14, as described above, the location of the PSCCH DMRS can be varied like the PSSCH DMRS, and the patterns of the PSCCH DMRS and the PSSCH DMRS can be the same. At this time, when comparing the PSCCH DMRS pattern of FIG. 14 with the PSCCH DMRS pattern of FIG. 13, the PSCCH DMRS pattern of FIG. 14 can be efficient when applying OCC. That is, since OCC can be applied smoothly to adjacent DMRS, the PSCCH DMRS pattern of FIG. 14 can be efficient. In addition, the PSCCH DMRS pattern of FIG. 14 can have a more uniform arrangement of DMRS sequences than that of FIG. 13, and thus can be superior to that of FIG. 13 in terms of performance. That is, referring to FIG. 14, the PSCCH DMRS pattern can be set identically to the PSSCH DMRS pattern. At this time, as an example, the PSCCH DMRS location may be set as shown in Tables 34 and 35 below, considering DMRS Configuration type 2 as described above, in order to make the overhead the same as that of the PSSCH. For example, Table 34 is a case where MIMO is not considered, and the orthogonal sequences may be set identically. On the other hand, Table 35 is a case where MIMO is considered, and may be a method based on a case where two antenna ports are distinguished. At this time, as an example, when SU-MIMO is considered, only the PSSCH DMRS may be considered for SU-MIMO. At this time, as an example, in the case described above, the PSCCH DMRS may be allocated based on Table 34 described above, and is not limited to the above-described embodiment.

[0216]

[0217]

[0218] At this time, for example, when PSCCH DMRS and PSSCH DMRS are configured simultaneously, the DMRS sequence can be determined based on the above-described mathematical expression 3. For example, PSCCH DMRS and PSSCH DMRS can be consecutively allocated to all PRBs to which PSCCH and / or PSSCH are allocated for each symbol. At this time, for example, the initial value can be as shown in the following mathematical formula 6. At this time, can be indicated via RRC signaling. On the other hand, for example, If the PSCCH is not indicated by RRC signaling, a fixed value may be used. In this case, for example, the fixed value may be a physical sidelink synchronization ID. In addition, for example, the fixed value may be a value calculated (or obtained) from a layer-2 link ID. In addition, for example, the fixed value may be a value that the terminal can check in advance before PSCCH transmission, and is not limited to the above-described embodiment. That is, the terminal may transmit the PSCCH by RRC signaling. If information about is not obtained, a preset fixed value can be used and is not limited to the above-described embodiment. In addition, for example, in the case of slot-based allocation, =14 may be.

[0219] [Equation 6]

[0220]

[0221] Figure 15 is a diagram showing a case where PSCCH DMRS and PSSCH DMRS are configured simultaneously and the PSCCH DMRS pattern position is fixed.

[0222] Referring to FIG. 15, the terminal can obtain DMRS-related information for sidelink transmission. (S1510) For example, the terminal can obtain DMRS-related information for sidelink transmission from the base station through RRC signaling or DCI. In addition, as an example, the DMRS-related information may be preset in the terminal and is not limited to the above-described embodiment. In this case, when the PSCCH DMRS and the PSCCH DMRS are configured simultaneously and the PSSCH DMRS pattern position is fixed, the terminal can perform PSCCH DMRS decoding first. (S1520) That is, when the PSCCH DMRS and the PSSCH DMRS are configured simultaneously in the same symbol as in Type 3-2 of FIGS. 7 to 10 described above and the PSSCH DMRS pattern position is fixed, the PSCCH DMRS decoding can be performed first. Thereafter, the terminal can decode the PSCCH based on the decoded PSCCH DMRS and obtain SCI ID information included in the PSCCH. (S1530) The terminal can receive DMRS-related information, perform decoding on the PSCCH DMRS, and obtain SCI ID information from the PSCCH based on the decoded information. At this time, as an example, as described above, the PSSCH DMRS allocation pattern can be changed. For example, the PSSCH DMRS allocation pattern can be set based on DMRS Configuration type 2 as described above, but is not limited thereto. At this time, the terminal can check the PSSCH DMRS pattern through the obtained SCI ID. (S1540) That is, as described above, the PSSCH DMRS pattern can be set based on the SCI ID, as described above. Next, the terminal can decode the PSSCH using both the PSCCH DMRS and the PSSCH DMRS.(S1550) That is, the terminal can perform channel estimation for the PSSCH through DMRS sequences that are consecutively assigned to both the PSCCH DMRS portion and the PSSCH DMRS portion. The terminal can perform a two-step decoding process as described above.

[0223] Figure 16 is a diagram showing a case where PSCCH DMRS and PSSCH DMRS are configured simultaneously and the PSCCH DMRS pattern position changes.

[0224] Referring to FIG. 16, a terminal can obtain DMRS-related information for sidelink transmission. (S1610) At this time, the terminal can obtain DMRS-related information for sidelink transmission from a base station through RRC signaling or DCI. In addition, as an example, the DMRS-related information may be preset in the terminal and is not limited to the above-described embodiment. At this time, when PSCCH DMRS and PSCCH DMRS are configured simultaneously and the PSSCH DMRS pattern position changes, the terminal can decode PSCCH DMRS and PSSCH DMRS simultaneously. (S1620) At this time, as an example, as described above, the allocation pattern of PSCCH DMRS, like PSSCH DMRS, may change according to SCI ID, as described above. At this time, the terminal can decode PSCCH DMRS and PSSCH DMRS simultaneously. However, since the allocation pattern of PSCCH may also change, blind decoding may be required. Next, the terminal can decode the PSCCH using the decoded PSCCH DMRS, and decode the PSSCH using the PSCCH DMRS and PSSCH DMRS. (S1630)

[0225] Fig. 17 is a drawing showing the configuration of a base station device and a terminal device according to the present disclosure.

[0226] The base station device (1700) may include a processor (1710), an antenna unit (1720), a transceiver (1730), and a memory (1740).

[0227] The processor (1710) performs baseband-related signal processing and may include a higher layer processing unit (1711) and a physical layer processing unit (1712). The higher layer processing unit (1711) may process operations of a MAC (Medium Access Control) layer, an RRC (Radio Resource Control) layer, or higher layers. The physical layer processing unit (1712) may process operations of a physical (PHY) layer (e.g., uplink reception signal processing, downlink transmission signal processing, sidelink transmission signal processing, sidelink reception signal processing). In addition to performing baseband-related signal processing, the processor (1710) may also control the overall operation of the base station device (1700).

[0228] The antenna unit (1720) may include one or more physical antennas, and when it includes multiple antennas, it may support MIMO (Multiple Input Multiple Output) transmission and reception. The transceiver (1730) may include a radio frequency (RF) transmitter and an RF receiver. The memory (1740) may store information processed by the processor (1710), software related to the operation of the base station device (1700), an operating system, applications, etc., and may also include components such as a buffer.

[0229] The processor (1710) of the base station (1700) may be configured to implement the operations of the base station in the embodiments described in the present invention.

[0230] The terminal device (1750) may include a processor (1760), an antenna unit (1770), a transceiver (1780), and a memory (1790). Meanwhile, as an example, in the present invention, communication between terminal devices may be performed based on sidelink communication. That is, in the present invention, each terminal device (1750) that performs sidelink communication may be a device that performs sidelink communication with not only the base station device (1700) but also the terminal device (1750), and is not limited to the above-described embodiment.

[0231] The processor (1760) performs baseband-related signal processing and may include a higher layer processing unit (1761) and a physical layer processing unit (1762). The higher layer processing unit (1761) may process operations of a MAC layer, an RRC layer, or higher layers. The physical layer processing unit (1762) may process operations of a PHY layer (e.g., downlink reception signal processing, uplink transmission signal processing, sidelink transmission signal processing, sidelink reception signal processing). In addition to performing baseband-related signal processing, the processor (1760) may also control the overall operation of the terminal device (1750).

[0232] The antenna unit (1770) may include one or more physical antennas, and when it includes multiple antennas, it may support MIMO transmission and reception. The transceiver (1780) may include an RF transmitter and an RF receiver. The memory (1790) may store information processed by the processor (1760), software related to the operation of the terminal device (1750), an operating system, applications, etc., and may also include components such as a buffer.

[0233] The processor (1760) of the terminal device (1750) may be configured to implement the operations of the terminal in the embodiments described in the present invention.

[0234] The same things described in the examples of the present invention can be applied to the operation of the base station device (1700) and the terminal device (1750), and redundant descriptions are omitted.

[0235] While the exemplary methods of this disclosure are presented as a series of operations for clarity of description, this is not intended to limit the order in which the steps are performed, and individual steps may be performed simultaneously or in different orders, if desired. To implement a method according to this disclosure, additional steps may be included in addition to the steps illustrated, some steps may be excluded and the remaining steps included, or some steps may be excluded and additional steps included.

[0236] The various embodiments of the present disclosure are not intended to list all possible combinations but rather to illustrate representative aspects of the present disclosure, and the matters described in the various embodiments may be applied independently or in combination of two or more.

[0237] Additionally, various embodiments of the present disclosure may be implemented by hardware, firmware, software, or a combination thereof. In the case of hardware implementation, the embodiments may be implemented by one or more Application Specific Integrated Circuits (ASICs), Digital Signal Processors (DSPs), Digital Signal Processing Devices (DSPDs), Programmable Logic Devices (PLDs), Field Programmable Gate Arrays (FPGAs), general processors, controllers, microcontrollers, microprocessors, etc.

[0238] The scope of the present disclosure includes software or machine-executable instructions (e.g., operating systems, applications, firmware, programs, etc.) that cause operations according to various embodiments of the present disclosure to be executed on a device or a computer, and a non-transitory computer-readable medium having such software or instructions stored thereon and executable on the device or computer.

[0239]

[0240] The present invention can be applied to a procedure for configuring a DMRS for a terminal supporting vehicle-to-everything (V2X) communication in a wireless communication system, and can be applied to a procedure for a terminal to communicate with another terminal via a side link.

Claims

1. In a method for a first terminal to communicate with a second terminal via a side link, Step for acquiring information related to DMRS (Demodulation Reference Signal); A step of simultaneously decoding PSCCH (Physical Sidelink Control Channel) DMRS and PSSCH (Physical Sidelink Shared Channel) DMRS; and A communication method for decoding a PSCCH based on the decoded PSCCH DMRS, and for decoding a PSSCH based on the decoded PSCCH DMRS and PSSCH DMRS.

Images