Devices and methods for effectively mapping reference signals for V2X communication in wireless communication systems

Abstract

An apparatus and method are provided for efficiently mapping reference signals for vehicle-to-everything (V2X) communication in a wireless communication system. The transmitting terminal performing V2X communication includes a processor and a transceiver. The processor generates sidelink control information (SCI), and the transceiver transmits the generated SCI to the receiving terminal via a physical sidelink control channel (PSCCH) and a physical sidelink shared channel (PSSCH). Based on the number of sub-channels and the size of at least one of the sub-channels, a decision is made as to whether the demodulation reference signal (DMRS) of the PSSCH and the PSCCH are assigned to the same orthogonal frequency division multiplexing (OFDM) symbols.

Description

[0001] Cross-references to related applications

[0002] This application is based on and claims priority to Korean Patent Application Nos. 10-2020-0111696 and 10-2020-0171377, filed with the Korean Intellectual Property Office on September 2, 2020 and December 9, 2020, respectively, the disclosures of which are incorporated herein by reference in their entirety. Technical Field

[0003] This disclosure generally relates to wireless communication, and more specifically, to apparatus and methods for effectively mapping reference signals for vehicle-to-everything (V2X) in a wireless communication system. Background Technology

[0004] The fifth-generation (5G) technology standard for wireless broadband networks, defined by the 3rd Generation Partnership Project (3GPP), is the latest version that has already begun commercialization. To achieve high data transmission rates, 5G communication systems can sometimes operate in the ultra-high frequency (millimeter wave) band (e.g., the 60 GHz band). In 5G systems, to reduce path loss of electromagnetic (EM) waves in the ultra-high frequency band and increase the transmission distance of EM waves, beamforming technology, massive MIMO technology, full-dimensional MIMO (FD-MIMO) technology, array antenna technology, analog beamforming technology, and / or massive MIMO technology can be applied.

[0005] To improve network efficiency / performance in 5G, technologies such as evolved small cells, advanced small cells, cloud radio access network (RAN), ultra-dense networks, device-to-device (D2D) communication, wireless backhaul, mobile networks, cooperative communication, cooperative multipoint (CoMP), and / or interference cancellation can be implemented.

[0006] In addition, technologies such as hybrid frequency shift keying and orthogonal amplitude modulation (FQAM), sliding window superposition coding (SWSC) as an advanced coding modulation (ACM) method, filter group multicarrier (FBMC), non-orthogonal multiple access (NOMA), and / or sparse code multiple access (SCMA) as an advanced access technology can be utilized in 5G systems.

[0007] Vehicle-to-Everything (V2X) is a vehicle communication system technology in which a first vehicle can communicate with another entity (such as a second vehicle) that can affect or be affected by the first vehicle. The V2X protocol based on the 4G wireless standard is called Long Term Evolution (LTE) V2X. The 5G New Radio (NR) Rel-16 also specifies a V2X protocol, namely NR V2X. LTE V2X only supports broadcast, while NR V2X also supports unicast and multicast. Rel-16 defines sidelink (SL) communication based on the 5G NR air interface, where sidelink refers to direct communication between user equipment (UE) or terminal nodes without data passing through the 5G network. UEs in NR V2X include vehicles, pedestrian-carried mobile devices, and roadside units (RDUs). NR V2X defines not only the sidelink physical channels, including the Physical Sidelink Control Channel (PSCCH), Physical Sidelink Shared Channel (PSSCH), and Physical Sidelink Broadcast Channel (PSBCH), but also a signal called the Demodulation Reference Signal (DMRS), which is used by the receiver to decode the associated sidelink physical channels. Summary of the Invention

[0008] Embodiments of the present invention provide an apparatus and method for efficiently mapping reference signals for vehicle-to-everything (V2X) communication in a wireless communication system.

[0009] According to one aspect of the present invention, a transmitting terminal is provided, comprising: a processor configured to generate sidelink control information (SCI) in a V2X communication system; and a transceiver configured to transmit the generated SCI to a receiving terminal via a physical sidelink control channel (PSCCH) and a physical sidelink shared channel (PSSCH). Whether to assign the demodulation reference signal (DMRS) of the PSSCH and the PSCCH to the same OFDM symbol is determined based on the number of sub-channels and the size of at least one of the sub-channels.

[0010] According to one aspect of the present invention, a receiving terminal for performing V2X communication is provided, the receiving terminal comprising: a transceiver that receives side link control information (SCI) from a transmitting terminal via a PSCCH and a PSSCH, and decodes the PSSCH based on the received SCI; and a processor that controls the transceiver. A decision is made based on the number of sub-channels and the size of at least one of the sub-channels to determine whether to assign the demodulation reference signal (DMRS) of the PSSCH and the PSCCH to the same OFDM symbol.

[0011] In another aspect, a method for communicating in a V2X communication system includes: generating an SCI at a transmitting terminal for transmission to a receiving terminal; determining, based on the number of sub-channels and the size of at least one of the sub-channels, whether to assign (i) the DMRS of the PSSCH and (ii) the PSCCH to the same OFDM symbol; and transmitting the SCI to the receiving terminal via the PSSCH and PSCCH according to the determination. Attached Figure Description

[0012] Embodiments of the inventive concept will become clearer from the following detailed description taken in conjunction with the accompanying drawings, in which:

[0013] Figure 1 This is a diagram illustrating an example of processing for transmitting unicast, multicast, and physical sidelink feedback channel (PSFCH) via a sidelink between terminals, according to an embodiment of the present invention.

[0014] Figure 2 This is a diagram illustrating an example of signaling processing between a terminal and a base station (BS) and channel transmission and reception processing between terminals, according to an embodiment of the present invention.

[0015] Figure 3 , Figure 4 and Figure 5 This is a diagram illustrating the time-frequency domain structure of a side link applied to a new radio (NR) communication system according to an embodiment of the present invention;

[0016] Figure 6 This is a block diagram illustrating an embodiment of the present invention, including radio frequency (RF) transmitting and receiving circuitry in a terminal or BS.

[0017] Figure 7 It is shown schematically. Figure 6 A block diagram of an example RF transmitting and receiving circuit;

[0018] Figure 8 This is a table showing the method for determining whether to allocate the Physical Side Link Shared Channel-Demodulation Reference Signal (PSSCH DMRS) and the Physical Side Link Control Channel (PSCCH) to the same Orthogonal Frequency Division Multiplexing (OFDM) symbols;

[0019] Figure 9 , Figure 10 , Figure 11 , Figure 12 , Figure 13 , Figure 14 and Figure 15 It is shown Figure 8 A diagram illustrating the mapping of each PSSCH DMRS;

[0020] Figure 16This is a table illustrating a method for determining the location where second side link control information (SCI) begins to be allocated, according to an embodiment of the present invention;

[0021] Figure 17 , Figure 18 , Figure 19 , Figure 20 and Figure 21 It is shown Figure 16 The diagrams showing the various second SCI mapping scenarios are shown in the image; and

[0022] Figure 22 This is a diagram illustrating a wireless communication device according to an embodiment of the concept of the present invention. Detailed Implementation

[0023] In the following description, embodiments of the inventive concept will be described in detail with reference to the accompanying drawings, in which the same reference numerals always denote the same elements.

[0024] The terminology used in this specification is for describing embodiments and is not intended to limit the inventive concept. In this specification, unless otherwise specified, the singular forms include the plural forms. The described elements, processes, operations, and / or components do not exclude the presence or addition of one or more other elements, processes, operations, and / or components.

[0025] Unless otherwise defined, all terms used in this specification (including technical and scientific terms) may be used in the sense that would be commonly understood by a person skilled in the art. Furthermore, unless specifically defined, terms defined in commonly used dictionaries are not to be idealized or over-interpreted.

[0026] Furthermore, in specifically describing embodiments of the inventive concept, orthogonal frequency division multiplexing (OFDM) or OFDM-based wireless communication systems will be primarily described, particularly the IEEE 802.11 standard. However, those skilled in the art can modify the embodiments and apply them to other communication systems with similar technical backgrounds and channel types (e.g., cellular communication systems such as Long Term Evolution (LTE), LTE-A Advanced (LTE-A), New Radio (NR), WiBro, or Global System for Mobile Communications (GSM), or long-range communication systems such as Bluetooth or Near Field Communication (NFC)) without significantly departing from the scope of the inventive concept.

[0027] In this document, "connection (combination)" and its derivatives refer to direct or indirect communication between two or more elements that are physically in contact or not physically in contact. The terms "transmit," "receive," and "communicate," and their derivatives, include all direct and indirect communication. "Including" and / or "comprise" as used in this specification indicate inclusion rather than limitation. "Or" is a collective term indicating "and / or." "Related to" and its derivatives indicate: including, being included in, connected to, meaning, implying, connected to, combined with, can communicate with, cooperate with, interfere with, placed parallel to, near, bound to, having, possessing the characteristics of, and having a relationship with. "Controller" refers to a specific device, system, or part thereof that controls at least one operation. A controller may be implemented by hardware or a combination of hardware and software and / or firmware. Functions associated with a particular controller may be centralized or distributed, either locally or remotely.

[0028] Figure 1 This diagram illustrates an example of processing unicast, multicast, and physical sidelink feedback channels (PSFCH) transmitted via sidelinks between terminals according to an embodiment of the present invention. First to eighth terminals 21, 23, 25, 27, 29, 31, 33, and 35 performing vehicle-to-everything (V2X) communication according to an embodiment of the present invention are shown as examples to facilitate understanding of the concepts disclosed herein. It should be noted that the first to eighth terminals 21 to 35 are illustrated as a car; however, in other examples, the first to eighth terminals 21 to 35 may be other types of mobile terminals.

[0029] In this example, communication between the first terminal 21 and the second terminal 23 is a one-to-one communication, i.e., unicast communication, performed via a side link. One-to-one communication can be unidirectional or bidirectional, as indicated by the arrows pointing in opposite directions. Signal exchange between the first terminal 21 and the second terminal 23 via unicast may include determining scrambling, control information mapping, data transmission, and processing of unique identifier (ID) values ​​using resources or values ​​occupied between the first terminal 21 and the second terminal 23.

[0030] In this example, the communication between the third terminal and the fifth terminals 25, 27, and 29 is multicast communication, where the third terminal 25 sends common data to the fourth terminal 27 and the fifth terminal 29 in the group via a side link. In multicast communication, terminals not included in the group may not receive signals sent by the third terminal 25 for multicast purposes. The resource allocation for signal transmission can be determined by the base station (BS) or by the terminal acting as the leader in the group, or the resource allocation for signal transmission can be selected by the terminal sending the signal.

[0031] Finally, the communication between the sixth terminal and the eighth terminals 31, 33, and 35 is multicast communication, in which the seventh terminal 33 and the eighth terminal 35 receive common data from the sixth terminal 31 (as shown by the dashed arrows) and send information (solid arrows) to the sixth terminal 31 as feedback regarding the success or failure of receiving the corresponding data. It should be noted that similar feedback can also be sent between terminals performing unicast communication (as shown by the arrows from terminal 23 to terminal 21).

[0032] For example, information about whether the corresponding data was successfully received or not could be a hybrid Automatic Repeat Request (HARQ) - Acknowledgment / Negative Acknowledgment (ACK / NACK) message, which could be included in the PSFCH.

[0033] According to embodiments of the present invention, the various types of communication described above can be performed between the first to eighth terminals 21, 23, 25, 27, 29, 31, 33, and 35 performing V2X communication. See below for reference. Figure 2 The communication between the vehicle and the fixed base station (BS) can also be achieved via V2X communication.

[0034] Figure 2 This diagram illustrates examples of signaling processing between a terminal and a BS, and channel transmission and reception processing between terminals, according to an embodiment of the present invention. The wireless communication system 1 according to an embodiment of the present invention may include a BS 51 and terminals 53 and 55. In other examples, more or fewer terminals may communicate with the BS 51.

[0035] The various channels and signals used in NR V2X side links include:

[0036] The Physical Side Link Control Channel (PSCCH) is used to send control information in the side link;

[0037] The Physical Sidelink Shared Channel (PSSCH) is used to transmit data payloads in the sidelink and can carry additional control information.

[0038] The Physical Sidelink Broadcast Channel (PSBCH) is used to transmit information supporting synchronization in the sidelink.

[0039] The Physical Sidelink Feedback Channel (PSFCH) is used to send feedback related to successful or failed reception of sidelink transmissions.

[0040] A demodulation reference signal (DMRS) can be transmitted within the associated physical channel PSCCH, PSSCH, or PSBCH and used by the receiving device to decode the associated physical channel. For example, a DMRS channel associated with a PSSCH can be referred to as "PSSCH DMRS".

[0041] Regarding NR V2X, the TS38.214 standard document discloses that both PSSCH DMRS and PSCCH can be assigned to the same OFDM symbol under certain conditions. However, because the specific conditions are described vaguely in general terms, they can be interpreted in various ways depending on the number and size of the sub-channels. Therefore, performance issues may arise in conventional UEs designed to comply with the TS38.214 NR V2X protocol, as such UEs attempting to communicate with each other via sidelinks may be incompatible. These drawbacks can be overcome in embodiments of the inventive concept, where the UE's decision on whether to assign PSSCH DMRS and PSCCH to the same OFDM symbol is based on the number and size of the sub-channels.

[0042] Continue to refer to Figure 2 If the wireless communication system 1 omits BS 51 and thus only includes terminals 53 and 55, the leader terminal between terminals 53 and 55 can generate scheduling information (e.g., sidelink control information (SCI) described later) without the need for radio resource control (RRC) signaling from the BS. Because the leader terminal between terminals 53 and 55 can perform scheduling work for sidelink communication without a BS, it is possible to determine whether the PSSCH DMRS and PSCCH are assigned to the same OFDM symbol, and to determine the location where the second sidelink control information (SCI) begins to be assigned.

[0043] For ease of understanding, consider the following example: a wireless communication system 1 includes terminals 53 and 55, and a BS 51, where sidelink communication between terminals 53 and 55 is scheduled via RRC signaling from the BS 51. For instance, in this scenario, the BS 51 can determine whether the PSSCH DMRS and PSCCH are assigned to the same OFDM symbol and the location where the second SCI begins to be assigned.

[0044] Figure 2 The terminals 53 and 55 shown can execute Figure 1 The V2X communication shown (e.g., unicast communication, multicast communication, or PSFCH transmission). Therefore, Figure 2 The illustration shows terminals 53 and 55 performing unicast communication between them. However, it can be interpreted as illustrating a subset of terminals within a group performing multicast communication.

[0045] Additionally, the wireless communication system 1 can be, for example, a wireless communication system using a cellular network (such as a New Radio (NR) communication system, a Long Term Evolution (LTE) communication system, an Advanced LTE communication system, a Code Division Multiple Access (CDMA) communication system, or a Global System for Mobile Communications (GSM) communication system), a Wireless Local Area Network (WLAN) communication system, or any other wireless communication system.

[0046] Here, the wireless communication network used by the wireless communication system 1 (for example, referred to as Radio Access Technology (RAT)) can support communication between multiple wireless communication devices, including terminal 53 and terminal 55, by sharing available network resources.

[0047] For example, in wireless communication networks, information can be transmitted using multiple access methods such as Code Division Multiple Access (CDMA), Frequency Division Multiple Access (FDMA), Time Division Multiple Access (TDMA), Orthogonal Frequency Division Multiple Access (OFDMA), Single Carrier Frequency Division Multiple Access (SC-FDMA), OFDM-FDMA, OFDM-TDMA, or OFDM-CDMA.

[0048] For example, the following description will assume that wireless communication system 1 is an NR communication system. However, exemplary embodiments of the inventive concept are not limited thereto, and exemplary embodiments of the inventive concept can also be applied to previous generation wireless communication systems and next generation wireless communication systems.

[0049] On the other hand, BS 51 can generally refer to a fixed station that communicates with terminal 53 and terminal 55 and / or another BS, and can exchange data and control information with terminal 53 and terminal 55 and / or another BS by communicating with terminal 53 and terminal 55 and / or another BS.

[0050] For example, BS 51 can be referred to as Node B, Evolved Node B (eNB), Next Generation Node B (gNB), Sector, Site, Base Transceiver System (BTS), Access Point (AP), Relay Node, Remote Radio Head (RRH), or Radio Unit (RU).

[0051] Furthermore, according to embodiments of the present invention, BS 51 can be interpreted as representing a collective meaning of a portion of the area or function covered by a base station controller (BSC) in CDMA, a node B in wideband CDMA (WCDMA), an eNB in ​​LTE, or a gNB or sector (site) in NR.

[0052] On the other hand, terminals 53 and 55 can be non-mobile user equipment, mobile vehicles, or any device that communicates with BS 51 to send data and / or control information to BS 51 and to receive data and / or control information from BS 51.

[0053] For example, each of terminals 53 and 55 may be referred to as a radio station (STA), mobile station (MS), mobile terminal (MT), user terminal (UT), user equipment (UE), subscriber station (SS), wireless device, handheld device, or vehicle.

[0054] BS 51 can connect to terminals 53 and 55 via a wireless channel and provide various communication services to terminals 53 and 55 through the connected wireless channel. All user services of BS 51 can be served through a shared channel. Furthermore, BS 51 can schedule terminals 53 and 55 by collecting their status information (such as buffer status, available transmission power status, and channel status).

[0055] Wireless communication system 1 can support beamforming technology via OFDM. Additionally, wireless communication system 1 can support adaptive modulation and coding (AMC), in which the modulation scheme and channel coding rate are determined based on the channel states of terminals 53 and 55.

[0056] For example, wireless communication system 1 can transmit and receive signals by using a frequency band of at least 6 GHz and a wide frequency band provided in a frequency band of less than 6 GHz.

[0057] For example, wireless communication system 1 can increase data transmission rate by using millimeter wave bands such as the 28 GHz band or the 60 GHz band.

[0058] In the millimeter-wave band, the signal attenuation per distance can be greater than that per distance in another band. Therefore, the wireless communication system 1 can support directional beam-based transmission and reception to ensure coverage. Furthermore, the wireless communication system 1 can perform beam scanning operations for directional beam-based transmission and reception.

[0059] Here, in the beam scanning operation, terminals 53 and 55, along with BS 51, determine transmit and receive beams whose directions are synchronized with each other by sequentially or randomly scanning directional beams with predetermined patterns. The patterns of the transmit and receive beams whose directions are synchronized with each other can be determined as a pair of transmit and receive beam patterns. The beam pattern can be defined as the shape of the beam determined based on the beam width and the direction of the beam peak.

[0060] Terminals 53 and 55 of the wireless communication system 1, as well as BS 51, can be configured and operated as described above. Examples of communication performed between terminals 53 and 55, or between terminals 53 and 55 and BS 51, will be described in detail in the following discussion.

[0061] Terminals 53 and 55 can access the network of wireless communication system 1 by sending signals to and receiving signals from BS 51 via uplink and downlink, respectively. The link between terminals 53 and 55 and BS 51 (i.e., the data transmission and reception interface) can be referred to as a Uu link. Furthermore, in order to exchange various configuration information items required for signal transmission and reception between terminals 53 and 55 and BS 51, an RRC connection can be performed between terminals 53 and 55 and BS 51, and the RRC communication can be referred to as Uu-RRC.

[0062] BS 51 can perform scheduling for signal transmission and reception (e.g., transmission and reception of PSSCH, PSCCH, and PSFCH) between terminal 53 and terminal 55, or can perform multicast-related settings (e.g., selecting a leader in a group or setting the size of a region for multicast) by executing RRC signaling on terminal 53 and terminal 55.

[0063] For example, terminals 53 and 55 can receive scheduling information for sidelink communication via RRC signaling or the physical downlink control channel (PDCCH) from BS 51.

[0064] Terminals 53 and 55 can send and receive signals via a side link between them. This side link (i.e., the data transmission and reception interface) between terminals 53 and 55 can be referred to as a PC5 link. Furthermore, in order to exchange various configuration information items for signal transmission and reception between terminals 53 and 55, an RRC connection can be established between terminals 53 and 55, and this RRC connection can be referred to as PC5-RRC.

[0065] Here, the channels for transmission and reception via the side link can be, for example, PSCCH, PSSCH, PSBCH broadcast along with the synchronization signal, or PSFCH used for transmitting feedback.

[0066] For the sake of simplicity, in the following text, terminal 53, which performs data transmission in the side link, may be referred to as the transmitting terminal, and terminal 55, which performs data reception in the side link, may be referred to as the receiving terminal. The transmitting terminal and the receiving terminal may perform data transmission and data reception in the side link, respectively.

[0067] Terminal 53 can generate sidelink scheduling information (SCI) based on the scheduling information received from BS 51. Terminal 53 can send the generated SCI to terminal 55 via PSCCH.

[0068] Here, an SCI can be sent to terminal 55 as a single SCI, or an SCI can be divided into two SCI items to be sent to terminal 55. For example, the method of dividing an SCI into two SCI items to be sent to terminal 55 can be called a Level 2 SCI (or Level 2 PSCCH).

[0069] Terminal 53 can send a PSSCH to receiving terminal 55 based on SCI. Terminal 55 can send a PSFCH to terminal 53, including information about whether the PSSCH sent by terminal 53 was successfully or unsuccessfully received (i.e., HARQ-ACK / NACK information). Therefore, terminal 53 can determine the HARQ ACK / NACK in the PSFCH received from terminal 55 and can determine whether to retransmit the PSSCH based on the determination result.

[0070] The various signal or channel transmission and reception operations performed between terminal 53 and terminal 55 and BS 51 will be described in detail later.

[0071] As described above, since the wireless communication system 1 according to an embodiment of the present invention can have the above-described characteristics and configuration, in the following, reference will be made to... Figures 3 to 5 According to embodiments of the present invention, the time-frequency domain structure of a side link applied to an NR communication system will be described.

[0072] For example, Figures 3 to 5 The time-frequency domain structure shown is merely an example of the time-frequency domain applied to an embodiment of the inventive concept, and the inventive concept is not limited thereto. For ease of description, it will be referred to as Figures 3 to 5 The time-frequency domain structure shown is an example.

[0073] First, refer to Figure 3 The horizontal axis represents the time domain, and the vertical axis represents the frequency domain. The basic unit in the time domain is the OFDM symbol, and N... symb Each OFDM symbol can be configured with one slot. The length of a subframe can be defined as 1.0 ms, and a radio frame can be defined as 10 ms. The basic unit in the frequency domain is the subcarrier, and the bandwidth of the system transmission band can include N. BW Subcarriers.

[0074] In the time-frequency domain, the basic unit of resources is the resource element (RE), which can be represented by OFDM symbol index and subcarrier index. A resource block (RB) or physical resource block (PRB) can be represented by N in the frequency domain. RB An RB can be defined by N (e.g., 12) consecutive subcarriers. Therefore, an RB can be defined by N. RB Defined by a number of subcarriers.

[0075] For example, the smallest unit of data transmission is typically an RB. In NR communication systems, N... symb At least one, N RB It is 12, and N BW and N RB It can be proportional to the bandwidth of the system's transmission frequency band. Furthermore, the data rate can be increased proportionally to the number of RBs scheduled to the terminal.

[0076] Channel bandwidth refers to the radio frequency (RF) bandwidth corresponding to the system transmission bandwidth. For example, in an NR communication system with a channel bandwidth of 100 MHz and a subcarrier width of 30 kHz, the system transmission bandwidth may include 273 RBs.

[0077] Based on the above, refer to Figure 4 and Figure 5 In Rel-16 NR V2X, sub-channels and resource pools defined to improve resource utilization efficiency are shown. For example, in Figure 4 The diagram illustrates an example of the basic frame structure of NR V2X (i.e., the time-frequency domain structure), and also shows a 2-level SCI. Figure 5 The resource pool is shown in the image.

[0078] For example, in NR V2X, a time slot may include a single resource pool or multiple resource pools, and a resource pool may include multiple subchannels. Here, the size of a subchannel may be one of, for example, 10 RBs, 15 RBs, 20 RBs, 25 RBs, 50 RBs, 75 RBs, and 100 RBs, or one of 4 RBs, 5 RBs, and 6 RBs.

[0079] The 0th symbol of the time slot (symbol 0) can be used for automatic gain control (AGC) training.

[0080] Additionally, in the 12th symbol of the time slot (symbol 12), a PSFCH for determining whether the PSSCH is normal can be allocated and transmitted, and the transmission timing can be two or three time slots after the time slot for transmitting the PSSCH. For example, when the PSSCH is transmitted in time slot A, the PSFCH for the corresponding PSSCH can be transmitted in time slot (A+2) or (A+3).

[0081] For example, a PSFCH can include one PRB (or one RB) and can be transmitted in each subchannel. Furthermore, transmit and receive periodicity can be set for each PSFCH, and the minimum value of the transmit and receive periodicity can be defined as 1 (slot unit). Because multiple PSFCHs can use the same resources, up to six cyclic shifts can be applied to different PSFCHs transmitted to the same RB. Therefore, for example, in an NR communication system with a channel bandwidth of 100 MHz and a subcarrier width of 30 kHz, each slot can transmit up to... 410 PSFCHs (approximately 410 in total).

[0082] On the other hand, in the symbols immediately preceding the PSFCH (e.g., symbol 11), an AGC for receiving the PSFCH can be allocated because the transmission objects (e.g., transmitting terminals) of symbols 0 to 9 (symbols 0 to 9) are different from the transmission objects (e.g., receiving terminals) of symbols 11 and 12 (symbols 11 and 12), and may require separate AGCs for the PSFCH.

[0083] Additionally, to ensure the protection time used for timing advance, protection symbols can be assigned to the 10th and 13th symbols (symbol 10 and symbol 13). Because the transmission objects of symbols 0 to 9 (symbol 0 to symbol 9) are different from those of symbols 11 and 12, reception may occur outside the symbol timing, so protection symbols may be required.

[0084] For symbols 1 through 9 (symbols 1 through 9) other than the channels described above, a demodulation reference signal (DMRS) (DMRS shown in the figures is used for PSSCH), PSCCH, and PSSCH can be assigned. Furthermore, PSFCH, AGC, and protection symbols can be assigned to symbols 1 through 9 (symbols 1 through 9). However, for ease of description, according to an embodiment of the present invention, it is taken as an example that PSFCH, AGC, and protection symbols are assigned to symbols 10 through 13.

[0085] For example, because SCIs are sent through two levels in NR V2X, the first SCI can be assigned to the original PSCCH scheduling area, and the second SCI can be assigned to the PSSCH scheduling area.

[0086] More specifically, the first SCI may be provided from the lowest RB of the PSCCH in a subchannel (e.g., RB#0 of subchannel #0). The first SCI may include allocation information of the PSSCH (e.g., frequency domain resource allocation (FDRA) and time domain resource allocation (TDRA)) and allocation information of the second SCI. The second SCI may be allocated starting from the lowest RE (i.e., SC#1 (SC represents a subcarrier)) other than the REs used for DMRS in the first DMRS symbol (DMRS of symbol 1) of the PSSCH. The second SCI may include information required to decode the PSSCH.

[0087] For example, Figure 4 It is shown that the size of one subchannel is 15 PRBs. However, according to the inventive concept, the size of one subchannel may be at least 20 PRBs. In the TS38.214 standard document, the conditions for allocating PSSCH DMRS and PSCCH to the same OFDM symbol are defined as follows.

[0088] <TS38.214, Section 8.2.2, Version 16.2.0>

[0089] If the PSSCH DMRS and PSCCH are mapped to the same OFDM symbol, such mapping within a single subchannel is supported only when the higher layer parameter subchannelsize >= 20 (i.e., the subchannel size is at least 20 PRBs).

[0090] Under the above conditions, the PSSCH DMRS may not be allocated to the entire subcarriers corresponding to the respective OFDM symbol, but may be allocated only to the remaining subcarriers except for the PSCCH region. Therefore, the number of PSSCH DMRSs available during channel estimation may be insufficient, and due to the insufficient PSSCH DMRSs, the performance of channel estimation may be limited. Therefore, in the above standard document, in order to ensure the minimum channel estimation performance, it is stipulated that the above mapping (i.e., allocating PSSCH DMRS and PSCCH to the same OFDM symbol) may be performed only when the size of the subchannel is at least 20 PRBs.

[0091] However, when the device is designed to strictly comply with the standard document, the determination of whether the mapping can be performed may be differently interpreted according to the number and size of the subchannels, which may lead to incorrect mapping and / or incompatibility between devices, resulting in communication failure. However, according to an embodiment of the inventive concept, the mapping is performed when specific predetermined conditions are met, which will be described in detail later.

[0092] As described above, the time-frequency domain of the sidelink applied to the NR communication system may be configured according to an embodiment of the inventive concept. Hereinafter, referring to Figure 6 and Figure 7 The configuration of the radio frequency (RF) transceiver of a terminal or BS according to an embodiment of the present invention will be described.

[0093] Figure 6 This is a block diagram illustrating an RF transmitting and receiving circuit 100 included in a terminal or BS according to an embodiment of the present invention. Figure 7 It is shown schematically. Figure 6 A block diagram of an example of an RF transmitting and receiving circuit 100.

[0094] For example, Figure 6 and Figure 7 The RF transmitting and receiving circuitry 100 may be included Figure 2 In terminal 53, terminal 55, or BS51. That is, Figure 6 and Figure 7 The RF transmitting and receiving circuitry 100 may be included Figure 2 The terminals 53 and 55 shown, as well as BS 51, can be used in, for example, computers, smartphones, portable electronic devices, tablets, wearable devices, or sensors for the Internet of Things.

[0095] First, refer to Figure 6 The RF transmitting and receiving circuitry 100 may include an antenna 90, a front-end module (FEM) 105, a radio frequency integrated circuit (RFIC) 110, and a baseband circuitry 120. Furthermore, although... Figure 6 Not shown, but the RF transmitting and receiving circuitry 100 may also include a power modulator that supplies a power voltage (e.g., a dynamically variable output voltage) to a power amplifier in the RFIC 110. The power modulator may be driven in either average power tracking mode or envelope tracking mode to generate and output the power voltage.

[0096] For example, the front-end module 105 and the RFIC 110 can be implemented as a single component on a single chip. In this case, the functions of the front-end module 105 and the RFIC 110 can be implemented on a single chip. For ease of description, according to an embodiment of the present invention, Figure 6 The front-end module 105 and RFIC 110, provided as separate components, are shown.

[0097] First, antenna 90 can be connected to front-end module 105 and can transmit signals received from front-end module 105 to another wireless communication device (terminal or BS), or can provide signals received from another wireless communication device to front-end module 105. Front-end module 105 can be connected to antenna 90 and can separate the transmission frequency from the reception frequency. That is, front-end module 105 can divide the signals received from RFIC 110 by frequency band and can provide the divided signals to antenna 90. Furthermore, front-end module 105 can provide signals received from antenna 90 to RFIC 110.

[0098] As described above, antenna 90 can transmit signal frequencies divided by front-end module 105 to the outside, or can provide signals received from the outside to front-end module 105.

[0099] Antenna 90 can be an array antenna or other types of antenna. Antenna 90 can be single or multiple. Therefore, in some embodiments, the RF transmit and receive circuitry 100 can support phased arrays and multiple-input multiple-output (MIMO) by using multiple antennas. Figure 6 For ease of description, only one antenna is shown in the image.

[0100] The front-end module 105 may include an antenna tuner. The antenna tuner (not shown) may be connected to the antenna 90 and may control the impedance of the antenna 90.

[0101] RFIC 110 can generate RF signals by performing frequency up-conversion on the baseband signal received from baseband circuit 120. RFIC 110 can also generate baseband signals by performing frequency down-conversion on the RF signal received from front-end module 105.

[0102] For example, RFIC 110 may include a transmitting circuit 112 for up-conversion, a receiving circuit 114 for down-conversion, and a local oscillator 116.

[0103] For example, although Figure 6 The transmitting circuit 112 may include a first analog baseband filter, a first mixer, and a power amplifier, though not shown in the diagram. The receiving circuit 114 may include a second analog baseband filter, a second mixer, and a low-noise amplifier.

[0104] Here, the first analog baseband filter can filter the baseband signal received from the baseband circuit 120 and provide the filtered baseband signal to the first mixer. The first mixer can perform up-conversion of the baseband signal frequency from the baseband to a higher frequency band according to the frequency of the signal provided by the local oscillator 116. Through up-conversion, the baseband signal can be provided as an RF signal to a power amplifier (not shown), and the power amplifier can amplify the RF signal and provide the amplified RF signal to the front-end module 105.

[0105] The low-noise amplifier amplifies the RF signal received from the front-end module 105 and provides the amplified RF signal to the second mixer. The second mixer performs down-conversion of the RF signal frequency from the high-frequency band to the baseband based on the frequency of the signal provided by the local oscillator 116. Through down-conversion, the RF signal can be provided as a baseband signal to the second analog baseband filter, which filters the baseband signal and provides the filtered baseband signal to the baseband circuit 120.

[0106] On the other hand, the baseband circuit 120 can receive baseband signals from the RFIC 110 and process the received baseband signals, or it can generate baseband signals and provide the generated baseband signals to the RFIC 110.

[0107] Additionally, the baseband circuit 120 may include a controller 122, a storage device 124, and a signal processing unit 125.

[0108] For example, controller 122 can control the overall operation of RFIC 110 and baseband circuitry 120. Additionally, controller 122 can write data to or read data from storage device 124. For this purpose, controller 122 may include at least one processor, microprocessor, or microcontroller, or may be part of a processor. For example, controller 122 may include a central processing unit (CPU) and a digital signal processor (DSP).

[0109] Storage device 124 can store data such as basic programs, application programs, and setting information for the operation of RF transmitting and receiving circuitry 100. For example, storage device 124 can store instructions and / or data related to controller 122, signal processing unit 125, or RFIC 110.

[0110] Storage device 124 may include various storage media. That is, storage device 124 may include volatile memory, non-volatile memory, or a combination of volatile memory and non-volatile memory, and for example, random access memory (RAM) such as dynamic RAM (DRAM), phase-change RAM (PRAM), magnetic RAM (MRAM) or static RAM (SRAM), or flash memory such as NAND flash memory, NOR flash memory or ONE NAND flash memory.

[0111] In addition, storage device 124 can store various processor-executable instructions. These processor-executable instructions can be executed by controller 122.

[0112] The signal processing unit 125 can process baseband signals received from RFIC 110 or process baseband signals to be provided to RFIC 110.

[0113] For example, for ease of description, the signal processing unit 125 will be described based on the components in the receiving path.

[0114] For example, the signal processing unit (or interchangeably, the “signal processor” or “signal processing circuit”) 125 may include a demodulator, a receiver filter and a cell searcher, and other processing circuitry (“processing block”).

[0115] First, the demodulator may include a channel estimator, a data deallocation unit, an interference whitening unit, a symbol detector, a channel state information (CSI) generator, a mobility measurement unit, an automatic gain control unit, an automatic frequency control unit, a symbol timing recovery unit, a delay spread estimation unit, and a time correlator, and may perform the functions of the above components.

[0116] Here, the mobility measurement unit used to measure the signal quality of the serving cell and / or neighboring cells to support mobility can measure the cell's Received Signal Strength Indicator (RSSI), Reference Received Power (RSRP), Reference Received Quality (RSRQ), and Reference Signal (RS) Signal-to-Interference-Noise Ratio (SINR).

[0117] For example, although Figure 6 Not shown, but the demodulator may include multiple sub-demodulators, which independently or jointly perform the above functions on despread signals or signals of various frequency bands in the 2G, 3G, 4G and 5G communication systems.

[0118] Then, the receive filter and cell searcher may include a receive filter, a cell searcher, a fast Fourier transform (FFT) unit, a time-duplex-automatic gain control (TD-AGC) unit, and a time-duplex-automatic frequency control (TD-AFC) unit.

[0119] Here, the receive filter (referred to as the receive front end) performs sampling, interference whitening, and amplification on the baseband signal received from RFIC 110. The cell searcher includes a primary synchronization signal (PSS) detector and a secondary synchronization signal (SSS) detector, and can measure the amplitude and quality of neighboring cell signals.

[0120] Other processing blocks may include a symbol processor, a channel decoder, and an uplink processor.

[0121] Here, the symbol processor can perform channel deinterleaving, demultiplexing, and rate matching, enabling the demodulated signal to be decoded channel-by-channel. The channel decoder can decode the demodulated signal block by block.

[0122] For example, the symbol processor and channel decoder may include a hybrid automatic repeat request (HARQ) processing unit, a turbo decoder, a cyclic redundancy check (CRC) checker, a Viterbi decoder, and a turbo encoder.

[0123] The uplink processor that generates and transmits baseband signals may include a signal generator, a signal distributor, an inverse fast Fourier transform (IFFT) unit, a discrete Fourier transform (DFT) unit, and a transmission front end.

[0124] Here, the signal generator can generate the Physical Uplink Shared Channel (PUSCH), Physical Uplink Control Channel (PUCCH), and Physical Random Access Channel (PRACH). The transmitting front end can perform interference whitening and digital mixing on the transmitted baseband signal.

[0125] For example, other processing blocks may include sidelink processors that can generate PSSCH, PSCCH, and PSFCH.

[0126] The sidelink processor can be provided without separation, allowing for the provision of an integrated processor that combines the sidelink processor with the uplink processor. In this case, the corresponding integrated processor can handle all uplink and sidelink-related operations. For ease of description, an example is presented where a sidelink processor is provided separately from the uplink processor.

[0127] As described above, the signal processing unit 125 may have the above-described configuration and characteristics. The configuration or function of the demodulator, receive filter, cell searcher, and other parts of the signal processing unit 125 may differ in other embodiments. For example, the channel estimator in the demodulator may be included in the receive filter and cell searcher or other processing blocks, and the FFT unit in the receive filter and cell searcher may be included in the demodulator or other processing blocks. Additionally, the channel decoder in other processing blocks may be included in the demodulator or the receive filter and cell searcher. For ease of description, embodiments of the present invention are described above as examples of the configuration or function of the demodulator, receive filter, cell searcher, and other processing blocks in the signal processing unit 125.

[0128] As mentioned above, in Figure 6 In the diagram, the baseband circuit 120 is shown as including a controller 122, a storage device 124, and a signal processing unit 125.

[0129] However, in the baseband circuit 120, at least two of the controller 122, storage device 124, and signal processing unit 125 can be integrated with each other. The baseband circuit 120 may further include other components besides those described above, or may not include some components. Furthermore, the signal processing unit 125 may also include other components besides those described above, or may not include some components.

[0130] According to an embodiment of the present invention, for ease of description, the baseband circuit 120 includes the above-described components as an example.

[0131] In some embodiments, the controller 122, storage device 124, and signal processing unit 125 may be included in a single device. In other embodiments, the controller 122, storage device 124, and signal processing unit 125 may be distributed across different devices (e.g., a distributed architecture).

[0132] Configured as described above Figure 6 The RF transmitting and receiving circuitry 100 may be included Figure 2 In terminal 53 or terminal 55 or BS 51.

[0133] RFIC 110 and baseband circuit 120 can be as follows Figure 6 The illustration includes portions known to those skilled in the art. The corresponding portions can be implemented using methods known to those skilled in the art, and can be implemented using hardware, firmware, software logic, or a combination of hardware, firmware, and software logic.

[0134] Figure 6 Only shown Figure 6This is an example of an RF transmitting and receiving circuit 100, and the inventive concept is not limited thereto. It can be applied to... Figure 6 Various modifications can be made to the embodiments (e.g., adding or deleting parts).

[0135] Here, refer to Figure 7 , showed Figure 6 An example of a partially modified (i.e. simplified) configuration of the RF transmitting and receiving circuitry.

[0136] For example, the RF transmitting and receiving circuitry 100 may include a processor 150, a transceiver 160, a memory 170, and an antenna 180.

[0137] The processor 150 can control the overall operation of the transceiver 160 and can write data to or read data from the memory 170. That is, the processor 150 may include, for example... Figure 6 The function of controller 122.

[0138] The transceiver 160 can send and receive wireless signals and can be controlled by the processor 150.

[0139] For example, transceiver 160 can generate an SCI. Transceiver 160 can send the generated SCI to the receiving terminal via PSCCH in the form of a single SCI or via PSCCH and PSSCH in the form of a two-level SCI as described above.

[0140] On the other hand, transceiver 160 can receive SCIs from the transmitting terminal via PSCCH and PSSCH, either as a single SCI or as a two-level SCI. Furthermore, transceiver 160 can decode the PSSCH based on the received SCIs.

[0141] For example, transceiver 160 may include Figure 6 The functions of the front-end module 105, RFIC 110, and signal processing unit 125 are described. In this case, the signal processing unit 125 can generate and decode the SCI, and the RFIC 110 and front-end module 105 can send the generated SCI to the receiving terminal or receive the generated SCI from the sending terminal. However, the inventive concept is not limited thereto.

[0142] The SCI transmitted by transceiver 160 can eventually be sent to the receiving terminal via antenna 180. The SCI received by transceiver 160 may be previously received from the transmitting terminal via antenna 180.

[0143] Memory 170 can store data such as basic programs, application programs, and setting information for the operation of RF transmitting and receiving circuitry 100. Therefore, memory 170 can store instructions and / or data associated with processor 150 and transceiver 160. That is, memory 170 may include, for example... Figure 6 The function of the storage device 124.

[0144] Antenna 180 can be connected to transceiver 160 and can transmit signals received from transceiver 160 to another wireless communication device (e.g., another terminal or BS), or can provide signals received from another wireless communication device to transceiver 160. That is, antenna 180 may include, for example... Figure 6 The function of antenna 90.

[0145] At the same time, although it has already been Figure 7 The embodiments described herein depict transceiver 160 generating SCI, but embodiments of the inventive concept can be implemented in various ways. For example, according to embodiments of the inventive concept, processor 150 can generate SCI and provide the generated SCI to transceiver 160. Furthermore, transceiver 160 can transmit the SCI to the receiving terminal via PSCCH and PSSCH.

[0146] According to embodiments of the present invention, the RF transmitting and receiving circuitry 100 included in terminal 53, terminal 55, or BS 51 has the aforementioned characteristics and configuration. Hereinafter, reference is made to... Figures 8 to 15 The method for determining whether to assign PSSCH DMRS and PSCCH to the same OFDM symbol, according to embodiments of the present invention, will be described in detail below.

[0147] Figure 8 This is a table showing the method for determining whether to assign PSSCH DMRS and PSCCH to the same OFDM symbol. Figures 9 to 15 It is shown Figure 8 A diagram illustrating various PSSCH DMRS mapping scenarios.

[0148] For example, referencing Figure 2 and Figure 7 To describe Figures 8 to 15 In the following text, for ease of description, we will take the example of the PSSCH being assigned to two OFDM symbols (e.g., the first OFDM symbol and the second OFDM symbol). Furthermore, the following text will assume that the PSSCH DMRS can be arranged in symbols different from those in the examples, and that the spacing between the corresponding symbols when the PSSCH DMRS is arranged in multiple symbols can differ from the spacing in the examples.

[0149] Reference Figure 8The table illustrates a method for determining whether to assign PSSCH DMRS and PSCCH to the same OFDM symbol, according to an embodiment of the present invention.

[0150] For example, a decision on whether to assign PSSCH DMRS and PSCCH to the same OFDM symbol can be made based on the number and size of the sub-channels.

[0151] First, refer to Figure 8 and Figure 9 Describing case "T1". When the number of sub-channels is 1 and the size of the sub-channel is at least 20 Physical Resource Blocks (PRBs), the DMRS and PSCCH of the PSSCH can be assigned to the same OFDM symbol.

[0152] In other words, under case "T1", the DMRS and PSCCH of PSSCH can be reused to the same OFDM symbol.

[0153] For example, case “T1” can be stated in section “8.2.2” of the aforementioned TS38.214 (version 16.2.0) standard document.

[0154] Then, refer to Figure 8 and Figure 10 Describing case "T2", when the number of sub-channels is 1 and the size of the sub-channel is less than 20 PRBs, the DMRS and PSCCH of the PSSCH can be assigned to different OFDM symbols, and the number of OFDM symbols to which the DMRS of the PSSCH is assigned can be at least two.

[0155] In other words, under case "T2", the DMRS and PSCCH of PSSCH can be used without reusing the same OFDM symbol.

[0156] Therefore, as Figure 10 As shown, for example, when the PSCCH is assigned to the first and second symbols, the DMRS of the PSSCH can be assigned to the third and fifth symbols, which are different from the symbols to which the PSCCH is assigned. The DMRS of the PSSCH can be assigned to symbols different from those to which the PSCCH is assigned. Figure 10 The symbols shown are different symbols, or can be assigned to at least three symbols.

[0157] For ease of description, according to an embodiment of the present invention, in case "T2", the DMRS and PSCCH of the PSSCH are respectively allocated to Figure 10 The symbols shown in the image are examples.

[0158] Then, refer to Figure 8 and Figure 11Description of case "T3". When the number of sub-channels is 1 and the size of the sub-channel is less than 20 PRBs, the DMRS and PSCCH of the PSSCH can be assigned to different OFDM symbols, and the number of OFDM symbols to which the DMRS of the PSSCH is assigned can be 1.

[0159] In other words, under case "T3", the DMRS and PSCCH of PSSCH can be used without being reused on the same OFDM symbol.

[0160] Therefore, as Figure 11 As shown, for example, when the PSCCH is assigned to the first and second symbols, the DMRS of the PSSCH can be assigned to the fifth symbol, which is different from the symbol to which the PSCCH is assigned. The DMRS of the PSSCH can be assigned to a symbol different from the symbol to which the PSSCH is assigned. Figure 11 The symbols shown are different symbols.

[0161] For ease of description, according to an embodiment of the present invention, in case "T3", the DMRS and PSCCH of the PSSCH are respectively allocated to Figure 11 The symbols shown in the image are examples.

[0162] Then, refer to Figure 8 and Figure 12 Describe case "T4". When the number of sub-channels is at least two and the size of the sub-channels is at least 20 PRBs, the DMRS and PSCCH of the PSSCH can be assigned to the same OFDM symbol. In addition, the number of OFDM symbols to which the DMRS of the PSSCH is assigned is at least two, and at least two OFDM symbols can be shared by at least two sub-channels.

[0163] In other words, under case "T4", the DMRS and PSCCH of PSSCH can be reused to the same OFDM symbol.

[0164] Therefore, as Figure 12 As shown, for example, when the PSCCH is assigned to the first symbol and the second symbol, the DMRS of the PSCCH can be assigned to the same first symbol as the symbol to which the PSCCH is assigned and to a fifth symbol different from the symbol to which the PSCCH is assigned on the first sub-channel and the second sub-channel (i.e., sub-channel #0 and sub-channel #1).

[0165] PSSCH's DMRS can be assigned to... Figure 12 The symbols shown are different symbols (e.g., a second symbol that is not the first symbol, or a fourth or sixth symbol that is not the fifth symbol), or can be assigned to at least three symbols.

[0166] For ease of description, according to an embodiment of the present invention, in case "T4", the DMRS and PSCCH of the PSSCH are respectively allocated to Figure 12 The symbols shown in the image are examples.

[0167] Then, refer to Figure 8 and Figure 13 Describing scenario "T5", when the number of sub-channels is at least two and the size of the sub-channels is less than 20 PRBs, the DMRS and PSCCH of the PSSCH can be assigned to different OFDM symbols. Furthermore, the number of OFDM symbols to which the DMRS of the PSSCH is assigned is at least two, and at least two OFDM symbols can be shared by at least two sub-channels.

[0168] In other words, under case "T5", the DMRS and PSCCH of PSSCH can be used without reusing the same OFDM symbol.

[0169] Therefore, as Figure 13 As shown, for example, when the PSCCH is assigned to the first and second symbols, the DMRS of the PSSCH can be assigned to the third and fifth symbols, which are different from the symbols to which the PSCCH is assigned, on the first and second sub-channels (i.e., sub-channel #0 and sub-channel #1). The DMRS of the PSSCH can be assigned to the same symbols as the first and second sub-channels (i.e., sub-channel #0 and sub-channel #1). Figure 13 The symbols shown are different symbols, or can be assigned to at least three symbols.

[0170] For ease of description, according to an embodiment of the present invention, in case "T5", the DMRS and PSCCH of the PSSCH are respectively allocated to Figure 13 The symbols shown in the image are examples.

[0171] Then, refer to Figure 8 and Figure 14 Description of case "T6". When the number of sub-channels is at least two and the size of the sub-channels is less than 20 PRBs, the DMRS and PSCCH of the PSSCH can be assigned to different OFDM symbols.

[0172] For example, in the first sub-channel (e.g., sub-channel #0) where the PSCCH is assigned in at least two sub-channels, the number of OFDM symbols to which the PSSCH DMRS is assigned is 1, and the PSSCH DMRS can be assigned to OFDM symbols different from the OFDM symbols to which the PSCCH is assigned. Conversely, in the second sub-channel (e.g., sub-channel #1) where the PSCCH is not assigned in at least two sub-channels, the number of OFDM symbols to which the PSSCH DMRS is assigned can be at least two.

[0173] In other words, under case "T6", the DMRS and PSCCH of the PSSCH in the first sub-channel (e.g., sub-channel #0) may not be multiplexed to the same OFDM symbol. Therefore, as Figure 14 As shown, in the first sub-channel, for example, when the PSCCH is assigned to the first and second symbols, the DMRS of the PSSCH can be assigned to the fifth symbol, which is different from the symbol to which the PSCCH is assigned.

[0174] On the other hand, in the second sub-channel (e.g., sub-channel #1), one of the OFDM symbols (e.g., the first symbol and the fifth symbol) to which the DMRS of the PSSCH is assigned (e.g., the first symbol) can be the same as the OFDM symbol (e.g., the first symbol) to which the DMRS of the PSSCH is assigned in the first sub-channel. The other of the OFDM symbols (e.g., the first symbol and the fifth symbol) to which the DMRS of the PSSCH is assigned in the second sub-channel (e.g., the fifth symbol) can be the same as the OFDM symbol (e.g., the fifth symbol) to which the DMRS of the PSSCH is assigned in the first sub-channel.

[0175] PSSCH's DMRS can be assigned to... Figure 14 The symbols shown are different symbols.

[0176] For ease of description, according to an embodiment of the present invention, in case "T6", the DMRS and PSCCH of the PSSCH are respectively allocated to Figure 14 The symbols shown in the image are examples.

[0177] Finally, refer to Figure 8 and Figure 15 Describe case "T7". When the number of sub-channels is at least two and the size of the sub-channels is less than 20 PRBs, the DMRS and PSCCH of the PSSCH can be assigned to the same OFDM symbol. Furthermore, the number of OFDM symbols to which the DMRS of the PSSCH is assigned is at least two, and at least two OFDM symbols can be shared by at least two sub-channels.

[0178] Therefore, in case "T7", the DMRS and PSCCH of PSSCH can be reused to the same OFDM symbol.

[0179] For example, in the first sub-channel (e.g., sub-channel #0) to which the PSSCH is assigned in at least two sub-channels, one OFDM symbol (e.g., the first symbol) to which the DMRS of the PSSCH is assigned can be the same as the OFDM symbol (e.g., the first symbol) to which the PSSCH is assigned. In the first sub-channel, another OFDM symbol (e.g., the fifth symbol) to which the DMRS of the PSSCH is assigned can be different from the OFDM symbol (e.g., the first and second symbols) to which the PSSCH is assigned.

[0180] On the other hand, in the second sub-channel (e.g., sub-channel #1) where the PSSCH is not assigned in at least two sub-channels, the DMRS of the PSSCH can be assigned to the same OFDM symbols as the first sub-channel (e.g., the first symbol and the fifth symbol). That is, the DMRS of the PSSCH can be assigned to the first and fifth symbols, which are the same symbols, in the first and second sub-channels (i.e., sub-channel #0 and sub-channel #1).

[0181] PSSCH's DMRS can be assigned to... Figure 15 The symbols shown are different symbols.

[0182] For ease of description, according to an embodiment of the present invention, in case "T7", the DMRS and PSCCH of the PSSCH are respectively allocated to Figure 15 The symbols shown in the image are examples.

[0183] As described above, according to embodiments of the present invention, the allocation of PSSCH DMRS and PSCCH to the same OFDM symbol is determined based on the number and size of the sub-channels. In the following, reference is made to... Figures 16 to 21 The method for determining the starting position for allocating the second SCI according to an embodiment of the present invention will be described in detail below.

[0184] Figure 16 This is a table illustrating a method for determining the starting position for allocating a second SCI according to an embodiment of the present invention. Figures 17 to 21 It shows Figure 16 The diagram shows various second SCI mapping scenarios.

[0185] For example, referencing Figure 2 and Figure 7 describe Figures 16 to 21In the following text, for ease of description, an example is used where the PSCCH is assigned to both the first and second OFDM symbols, and the SCI includes a first SCI (transmitted to the receiving terminal via the PSCCH or received from the transmitting terminal via the PSCCH) and a second SCI (transmitted to the receiving terminal via the PSSCH or received from the transmitting terminal via the PSSCH). Additionally, for simplicity, the "subcarrier" level is not shown on the vertical axis of the figures.

[0186] Reference Figure 16 The table illustrates a method for determining the starting position for allocating a second SCI according to an embodiment of the present invention.

[0187] Specifically, the starting position for allocating the second SCI can be determined based on the number and size of the sub-channels.

[0188] First, refer to Figure 16 and Figure 17 Describe case "T8". When the number of sub-channels is 1 and the size of the sub-channel is less than 20 PRBs, the DMRS and PSCCH of the PSSCH can be assigned to different OFDM symbols, and the number of OFDM symbols to which the DMRS of the PSSCH is assigned can be at least two.

[0189] In other words, case "T8" can be the same as case "T2".

[0190] In this case, the second SCI can be assigned to the first adjacent position between the DMRS and PSCCH of the PSSCH (i.e., position "8").

[0191] Specifically, the second SCI can be assigned starting from the lowest subcarrier in the first OFDM symbol (third symbol) of the OFDM symbols (e.g., the third and fifth symbols) to which the DMRS of the PSSCH is assigned, excluding the subcarrier used for the DMRS.

[0192] When a second SCI needs to be additionally allocated after the last subcarrier of the resource pool corresponding to the OFDM symbol (i.e., the third symbol) has been allocated, the remaining second SCIs may be allocated starting from the lowest subcarrier of the next OFDM symbol (e.g., the fourth symbol).

[0193] Because of previous references Figure 4 The meaning of "lowest subcarrier" has been described, so its detailed description will be omitted.

[0194] Then, refer to Figure 16 and Figure 18Description of case "T9". When the number of sub-channels is 1 and the size of the sub-channel is less than 20 PRBs, the DMRS and PSCCH of the PSSCH can be assigned to different OFDM symbols, and the number of OFDM symbols to which the DMRS of the PSSCH is assigned can be 1.

[0195] In other words, case "T9" can be the same as case "T3".

[0196] In this case, the second SCI can be assigned to the first adjacent position between the DMRS and PSCCH of the PSSCH (i.e., position "9").

[0197] Specifically, the second SCI can be assigned starting from the lowest subcarrier in the OFDM symbol (fifth symbol) to which the DMRS of the PSSCH is assigned, excluding the subcarriers used for the DMRS.

[0198] When a second SCI needs to be additionally allocated after the last subcarrier of the resource pool corresponding to the OFDM symbol (i.e., the fifth symbol) has been allocated, the remaining second SCIs may be allocated starting from the lowest subcarrier of the next OFDM symbol (e.g., the sixth symbol).

[0199] Then, refer to Figure 16 and Figure 19 Describe case "T10". When the number of sub-channels is at least two and the size of the sub-channels is less than 20 PRBs, the DMRS and PSCCH of the PSSCH can be assigned to different OFDM symbols. In addition, the number of OFDM symbols to which the DMRS of the PSSCH is assigned is at least two, and at least two OFDM symbols can be shared by at least two sub-channels.

[0200] In other words, case "T10" can be the same as case "T5".

[0201] In this case, the second SCI can be assigned to the second adjacent position between the DMRS and PSCCH of the PSSCH (i.e., position "10").

[0202] Specifically, the second SCI can be assigned starting from the lowest subcarrier in the OFDM symbols (e.g., the fifth symbol) to which the DMRS of the PSSCH is assigned, excluding the subcarriers used for the DMRS.

[0203] When a second SCI needs to be additionally allocated after the last subcarrier of the resource pool corresponding to the OFDM symbol (i.e., the fifth symbol) has been allocated, the remaining second SCIs may be allocated starting from the lowest subcarrier of the next OFDM symbol (e.g., the sixth symbol).

[0204] For example, in case "T10", only the embodiment where the second SCI is assigned to position "10" is shown. However, the second SCI can be assigned to another position other than position "10" (e.g., the first adjacent position between the DMRS and PSCCH of the PSSCH). That is, in case "T10", the second SCI can be assigned starting from the lowest subcarrier in the OFDM symbols (e.g., the third symbol) of the OFDM symbols (e.g., the third symbol) to which the DMRS of the PSSCH is assigned, excluding the subcarrier used for the DMRS. For ease of description, in case "T10", the second SCI is assigned to position "10" as an example according to the embodiment of the present invention.

[0205] Then, refer to Figure 16 and Figure 20 Description of case "T11". When the number of sub-channels is at least two and the size of the sub-channels is less than 20 PRBs, the DMRS and PSCCH of the PSSCH can be assigned to different OFDM symbols.

[0206] Specifically, in the first sub-channel (e.g., sub-channel #0) to which the PSCCH is assigned in at least two sub-channels, the number of OFDM symbols to which the PSSCH's DMRS is assigned is 1, and the PSSCH's DMRS can be assigned to symbols different from those to which the PSCCH is assigned. Additionally, in the second sub-channel (e.g., sub-channel #1) to which the PSCCH is not assigned in at least two sub-channels, the number of OFDM symbols to which the PSSCH's DMRS is assigned can be at least two.

[0207] For example, in the first sub-channel (e.g., sub-channel #0), the DMRS and PSCCH of the PSSCH may not be multiplexed to the same OFDM symbol. Therefore, as Figure 20 As shown, for example, when the PSCCH is assigned to the first and second symbols, the DMRS of the PSSCH can be assigned to the fifth symbol, which is different from the symbol to which the PSCCH is assigned.

[0208] On the other hand, in the second sub-channel (e.g., sub-channel #1), one of the OFDM symbols (e.g., the first symbol and the fifth symbol) to which the DMRS of the PSSCH is assigned can be the same as the OFDM symbol (e.g., the first symbol) to which the PSSCH is assigned in the first sub-channel. Another OFDM symbol (e.g., the fifth symbol) to which the DMRS of the PSSCH is assigned in the second sub-channel can be the same as the OFDM symbol (e.g., the fifth symbol) to which the DMRS of the PSSCH is assigned in the first sub-channel.

[0209] In other words, case "T11" can be the same as case "T6".

[0210] In this case, the second SCI can be assigned to the first adjacent position between the DMRS and PSCCH of the PSSCH (i.e., position "11").

[0211] Specifically, the second SCI can be assigned starting from the lowest subcarrier in one of the OFDM symbols (e.g., the first symbol and the fifth symbol) to which the DMRS of the PSSCH in the second subchannel (e.g., subchannel #1) is assigned, excluding the subcarrier used for the DMRS.

[0212] When a second SCI needs to be additionally allocated after the last subcarrier of the resource pool corresponding to the OFDM symbol (i.e., the first symbol) has been allocated, the remaining second SCIs can be allocated starting from the lowest subcarrier in the next OFDM symbol (e.g., the second symbol), excluding the subcarrier used for PSCCH. In other words, the additional allocation of the second SCI can begin sequentially from the lowest subcarrier in the first subchannel (subchannel #0), excluding the subcarrier used for PSCCH (i.e., the subcarrier immediately above PSCCH).

[0213] Finally, refer to Figure 16 and 21 Describe case "T12". When the number of sub-channels is at least two and the size of the sub-channels is less than 20 PRBs, the DMRS and PSCCH of the PSSCH can be assigned to the same OFDM symbol. Furthermore, the number of OFDM symbols to which the DMRS of the PSSCH is assigned is at least two, and at least two OFDM symbols can be shared by at least two sub-channels.

[0214] Specifically, in the first sub-channel (e.g., sub-channel #0) to which the PSSCH is assigned in at least two sub-channels, one OFDM symbol (e.g., the first symbol) among the OFDM symbols to which the PSSCH's DMRS is assigned can be the same as the OFDM symbol (e.g., the first symbol) to which the PSSCH is assigned. Additionally, in the first sub-channel, another OFDM symbol (e.g., the fifth symbol) among the OFDM symbols to which the PSSCH's DMRS is assigned can be different from the OFDM symbol (e.g., the first and second symbols) to which the PSSCH is assigned.

[0215] Additionally, in a second sub-channel (e.g., sub-channel #1) where the PSSCH is not assigned in at least two sub-channels, the DMRS of the PSSCH can be assigned to the same OFDM symbols (e.g., the first and fifth symbols) as the OFDM symbols in the first sub-channel. That is, the DMRS of the PSSCH can be assigned to the same OFDM symbols, namely the first and fifth symbols, on both the first and second sub-channels (i.e., sub-channel #0 and sub-channel #1).

[0216] In other words, case "T12" can be the same as case "T7".

[0217] In this case, the second SCI can be assigned to the first adjacent position between the DMRS and PSCCH of the PSSCH (i.e., position "12").

[0218] For example, a second SCI can be assigned starting from the lowest subcarrier other than the subcarrier used for the DMRS in one of the OFDM symbols (e.g., the first and fifth symbols) to which the DMRS of the PSSCH is assigned. A second SCI can also be assigned starting from the lowest subcarrier other than the subcarrier used for the DMRS in the subcarrier immediately above the PSSCH in the corresponding OFDM symbol (e.g., the first symbol).

[0219] When a second SCI needs to be additionally allocated after the last subcarrier of the resource pool corresponding to the OFDM symbol (i.e., the first symbol) has been allocated, the remaining second SCIs can be allocated starting from the lowest subcarrier in the next OFDM symbol (e.g., the second symbol), excluding the subcarrier used for PSCCH. In other words, the additional allocation of second SCIs can be sequentially started from the lowest subcarrier (i.e., the subcarrier immediately above the PSCCH) excluding the subcarrier used for PSCCH.

[0220] As described above, according to an embodiment of the present invention, the starting position for allocating the second SCI varies depending on the number and size of the sub-channels. In the following, reference will be made to... Figure 22 A wireless communication device implemented according to an embodiment of the present invention is described.

[0221] Figure 22 This is a diagram illustrating a wireless communication device 201 according to an embodiment of the concept of the present invention. For example, Figure 22 The wireless communication device 201 can be applied to a BS (e.g., according to embodiments of the present invention) implemented according to the concept of the present invention. Figure 2 51, eNB, gNB or AP) or terminal (e.g., Figure 2 (53 or 55, STA, MS or UE). Furthermore, in some embodiments, Figure 22 The wireless communication device 201 can operate in standalone (SA) mode or non-standalone (NSA) mode.

[0222] like Figure 22 The diagram illustrates a wireless communication device 201 implemented in a network environment 200. The wireless communication device 201 may include a bus 210, a processor 220, a memory 230, an input and output interface 250, a display module 260, and a communication interface 270. In the wireless communication device 201, at least one of the above-described components may be omitted, or at least one other component may be included. For ease of description, an embodiment of the present invention is used as an example, assuming the wireless communication device 201 includes the above-described components.

[0223] Bus 210 can connect processor 220, memory 230, input and output interface 250, display module 260 and communication interface 270 to each other. Therefore, signal exchange and transmission (e.g., control messages and / or data) between processor 220, memory 230, input and output interface 250, display module 260 and communication interface 270 can be performed through bus 210.

[0224] Processor 220 may include one or more of a central processing unit (CPU), an application processor (AP), and a communication processor (CP). Processor 220 may process, for example, operations or data related to control and / or communication with other elements in wireless communication device 201. For example, processor 220 may include… Figure 7 The functions of the processor 150.

[0225] The memory 230 may include volatile memory and / or non-volatile memory. The memory 230 may store, for example, commands or instructions or data concerning other elements in the wireless communication device 201.

[0226] Additionally, memory 230 may store software and / or program 240. Program 240 may include, for example, kernel 241, middleware 243, application programming interface (API) 245, application program 247 (referred to as application), and network access information 249.

[0227] For example, at least some of kernel 241, middleware 243, and API 245 may be referred to as an operating system (OS). Memory 230 may include... Figure 7 The function of memory 170.

[0228] The input and output interface 250 can transmit, for example, commands, instructions, or data received from a user or another external device to other components of the wireless communication device 201. Additionally, the input and output interface 250 can output commands, instructions, or data received from other components of the wireless communication device 201 to a user or another external device.

[0229] Display module 260 may include, for example, a liquid crystal display (LCD), a light-emitting diode (LED) display, an organic light-emitting diode (OLED) display, a microelectromechanical system (MEMS) display, or an electronic paper display.

[0230] Additionally, the display module 260 can display various content to the user, such as text, images, videos, icons, and symbols. The display module 260 may include a touchscreen and can receive touch, gesture, proximity, or hover input using, for example, an electronic pen or a part of the user's body.

[0231] Communication interface 270 can configure communication between wireless communication device 201 and external devices (e.g., electronic devices 202 and 204 or server 206). Communication interface 270 can be connected to network 262 via wireless or wired communication and can communicate with external devices. Additionally, communication interface 270 can communicate with external devices (e.g., electronic device 202) via wireless communication 264. Communication interface 270 may include... Figure 7 The functions of the transceiver 160.

[0232] For example, wireless communication 264 can use at least one of NR, LTE, LTE-A, CDMA, WCDMA, UMTS, WiBro, and GSM as a cellular communication protocol. Wired communication can include at least one of Universal Serial Bus (USB), High Definition Multimedia Interface (HDMI), Recommended Standard (RS) 232, and Common Old-Style Telephone Service (POTS).

[0233] Additionally, network 262, which is a telecommunications network, may include at least one of a computer network (e.g., a LAN or WAN), the Internet, and a telephone network.

[0234] External electronic devices 202 and 204 may be the same as or different from wireless communication device 201. Server 206 may include a group of one or more servers.

[0235] For example, some or all of the operations performed by the wireless communication device 201 may be performed by other external devices (e.g., electronic devices 202 and 204 or server 206).

[0236] Furthermore, when the wireless communication device 201 needs to automatically perform a specific function or service, or needs to perform a function or service upon request, the wireless communication device 201 can perform the function or service itself, or it can request other external devices (e.g., electronic devices 202 and 204, or server 206) to perform part of the function or service. Other external devices (e.g., electronic devices 202 and 204, or server 206) can perform the requested function or service and can send the result to the wireless communication device 201. In this case, the wireless communication device 201 can process the received result as is, or it can additionally process the received result and perform the function or service.

[0237] Such mechanisms, such as cloud computing, distributed computing, or client-server computing technologies, can be applied to wireless communication devices 201.

[0238] As described above, according to embodiments of the present invention, by means of a device and method for efficiently mapping reference signals for V2X communication, it is possible to determine whether to assign PSSCHDMRS and PSCCH to the same OFDM symbol and the position to begin assigning the second SCI, even in various situations not disclosed in TS38.214.

[0239] The various functions described above can be implemented or supported by one or more computer programs, each program being formed by computer-readable program code and executed in a computer-readable recording medium. In this document, "application" and "program" refer to one or more computer programs, software elements, instruction sets, processes, functions, objects, classes, instances, associated data, or portions thereof suitable for implementing multiple lines of computer-readable program code. "Computer-readable program code" includes all types of computer code, including source code, object code, and executable code. "Computer-readable medium" includes all types of media accessible by a computer, such as read-only memory (ROM), random access memory (RAM), hard disk drives, compact discs (CDs), digital video discs (DVDs), and other types of memory. "Non-transitory" computer-readable media does not include wired, wireless, optical, or other communication links that transmit temporary electrical or other signals. Non-transitory computer-readable media includes media that can permanently store data and media that can store data and can be rewritten later (such as rewritable optical discs or removable memory devices).

[0240] Although embodiments of the inventive concept have been specifically shown and described, it will be understood that various changes in form and detail may be made in the embodiments of the inventive concept without departing from the spirit and scope of the inventive concept as defined by the claims and their equivalents.

Claims

1. A transmitting terminal for performing vehicle-to-everything (V2X) communication, the transmitting terminal comprising: A processor configured to generate sidelink control information; as well as The transceiver is configured to transmit generated sidelink control information to the receiving terminal via a physical sidelink control channel and a physical sidelink shared channel. Specifically, based on the number of sub-channels and the size of at least one of the sub-channels, a decision is made as to whether to allocate the demodulation reference signal of the physical side link shared channel and the physical side link control channel to the same orthogonal frequency division multiplexing symbol. Wherein, when the number of sub-channels is at least two and the size of the sub-channels is less than 20 physical resource blocks, the demodulation reference signal of the physical side link shared channel and the physical side link control channel are assigned to different orthogonal frequency division multiplexing symbols, the number of orthogonal frequency division multiplexing symbols to which the demodulation reference signal of the physical side link shared channel is assigned is at least two, and the at least two orthogonal frequency division multiplexing symbols are shared by the at least two sub-channels.

2. The transmitting terminal as described in claim 1, wherein, When the number of sub-channels is one and the size of the sub-channel is at least 20 physical resource blocks, the demodulation reference signal of the physical side link shared channel and the physical side link control channel are assigned to the same orthogonal frequency division multiplexing symbol.

3. The transmitting terminal as described in claim 1, wherein, When the number of sub-channels is one and the size of the sub-channel is less than 20 physical resource blocks, the demodulation reference signal of the physical side link shared channel and the physical side link control channel are assigned to different orthogonal frequency division multiplexing symbols.

4. The transmitting terminal as described in claim 3, wherein, The demodulation reference signal of the physical side link shared channel is allocated to at least two orthogonal frequency division multiplexing symbols.

5. The transmitting terminal as described in claim 4, wherein, The sidelink control information includes first sidelink control information and second sidelink control information. Wherein, the first sidelink control information is sent to the receiving terminal through the physical sidelink control channel, and the second sidelink control information is sent to the receiving terminal through the physical sidelink shared channel, and The second side link control information is allocated starting from the lowest subcarrier in the first orthogonal frequency division multiplexing symbol, excluding the subcarrier used for the demodulation reference signal, to which the demodulation reference signal of the physical side link shared channel is allocated.

6. The transmitting terminal as described in claim 3, wherein, The demodulation reference signal of the physical side link shared channel is allocated to one orthogonal frequency division multiplexing symbol.

7. The transmitting terminal as described in claim 6, wherein, The sidelink control information includes first sidelink control information and second sidelink control information. Wherein, the first sidelink control information is sent to the receiving terminal through the physical sidelink control channel, and the second sidelink control information is sent to the receiving terminal through the physical sidelink shared channel, and The second side link control information is allocated starting from the lowest subcarrier in the orthogonal frequency division multiplexing symbols to which the demodulation reference signal of the physical side link shared channel is allocated, excluding the subcarrier used for the demodulation reference signal.

8. The transmitting terminal as described in claim 1, wherein, When the number of sub-channels is at least two and the size of the sub-channels is at least 20 physical resource blocks, the demodulation reference signal of the physical side link shared channel and the physical side link control channel are assigned to the same orthogonal frequency division multiplexing symbol.

9. The transmitting terminal as described in claim 1, wherein, The sidelink control information includes first sidelink control information and second sidelink control information. Wherein, the first sidelink control information is sent to the receiving terminal through the physical sidelink control channel, and the second sidelink control information is sent to the receiving terminal through the physical sidelink shared channel, and Specifically, the second side link control information is allocated starting from the lowest subcarrier in the second orthogonal frequency division multiplexing symbol, excluding the subcarrier used for the demodulation reference signal, to which the demodulation reference signal of the physical side link shared channel is allocated.

10. The transmitting terminal as claimed in claim 1, wherein, In the first sub-channel to which the physical side link control channel is assigned in the at least two sub-channels, the demodulation reference signal of the physical side link shared channel is assigned one orthogonal frequency division multiplexing (OFDM) symbol, and the demodulation reference signal of the physical side link shared channel is assigned to an OFDM symbol different from that assigned to the physical side link control channel. In the second sub-channel to which the physical side link control channel is not assigned in the at least two sub-channels, the number of orthogonal frequency division multiplexing symbols to which the demodulation reference signal of the physical side link shared channel is assigned is at least two.

11. The transmitting terminal as claimed in claim 10, wherein, In the second sub-channel, the demodulation reference signal of the physical-side link shared channel is assigned to one of the orthogonal frequency division multiplexing (OFDM) symbols, which is the same as the OFDM symbol assigned to the physical-side link control channel in the first sub-channel. In the second sub-channel, the other orthogonal frequency division multiplexing symbol in the orthogonal frequency division multiplexing symbols to which the demodulation reference signal of the physical side link shared channel is assigned is the same as the orthogonal frequency division multiplexing symbol to which the demodulation reference signal of the physical side link shared channel is assigned in the first sub-channel.

12. The transmitting terminal as claimed in claim 11, wherein, The sidelink control information includes first sidelink control information and second sidelink control information. Wherein, the first sidelink control information is sent to the receiving terminal through the physical sidelink control channel, and the second sidelink control information is sent to the receiving terminal through the physical sidelink shared channel, and The second side link control information is allocated starting from the lowest subcarrier in one of the orthogonal frequency division multiplexing symbols to which the demodulation reference signal of the physical side link shared channel is allocated, excluding the subcarrier used for the demodulation reference signal.

13. A receiving terminal for performing vehicle-to-everything (V2X) communication, the receiving terminal comprising: A transceiver is configured to receive sidelink control information from a transmitting terminal via a physical sidelink control channel and a physical sidelink shared channel, and to decode the physical sidelink shared channel based on the received sidelink control information. as well as The processor controls the transceiver. Specifically, based on the number of sub-channels and the size of at least one of the sub-channels, a decision is made as to whether to allocate the demodulation reference signal of the physical side link shared channel and the physical side link control channel to the same orthogonal frequency division multiplexing symbol. Wherein, when the number of sub-channels is at least two and the size of the sub-channels is less than 20 physical resource blocks, the demodulation reference signal of the physical side link shared channel and the physical side link control channel are assigned to different orthogonal frequency division multiplexing symbols, the number of orthogonal frequency division multiplexing symbols to which the demodulation reference signal of the physical side link shared channel is assigned is at least two, and the at least two orthogonal frequency division multiplexing symbols are shared by the at least two sub-channels.

14. A method for communication in a vehicle-to-everything (V2X) communication system, the method comprising: The sending terminal generates side link control information for transmission to the receiving terminal; The determination of whether to allocate the demodulation reference signal of the physical side link shared channel and the physical side link control channel to the same orthogonal frequency division multiplexing symbol is based on the number of sub-channels and the size of at least one of the sub-channels. as well as Based on the determination, the sidelink control information is sent to the receiving terminal through the physical sidelink shared channel and the physical sidelink control channel. Wherein, when the number of sub-channels is at least two and the size of the sub-channels is less than 20 physical resource blocks, the demodulation reference signal of the physical side link shared channel and the physical side link control channel are assigned to different orthogonal frequency division multiplexing symbols, the number of orthogonal frequency division multiplexing symbols to which the demodulation reference signal of the physical side link shared channel is assigned is at least two, and the at least two orthogonal frequency division multiplexing symbols are shared by the at least two sub-channels.

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