Method and apparatus for transmitting and receiving a signal in a wireless communication system supporting sidelink

Abstract

The present specification provides a method for transmitting and receiving signals in a wireless communication system that supports sidelink. More specifically, the method performed by a first wireless device may be configured to include: performing sidelink discovery for discovering a wireless device to perform sidelink communication; determining a first wireless resource for transmitting a PSCCH including a first SCI including sidelink scheduling information, and a second wireless resource for transmitting a PSSCH including a second SCI and a transmission block; transmitting the PSCCH to a second wireless device over the determined first wireless resource; transmitting the first PSSCH to the second wireless device over the determined second wireless resource; and receiving the second PSSCH from the second wireless device over the determined second wireless resource.

Description

Technology Field

[0001] This specification relates to a method for transmitting and receiving signals in a sidelink of V2X communication, and more specifically, to a method for transmitting and receiving signals using full duplexing and an apparatus supporting the same. Background Technology

[0002] In 3GPP 5G NR V2X, the unicast method enables 1:1 communication between vehicles and plays a key role in services requiring ultra-low latency, high-reliability transmission and reception of messages for negotiation and coordination between vehicles, particularly in Cooperative Autonomous Driving. Since the sidelink of existing 3GPP 5G NR V2X operates in a half-duplexing manner where transmission and reception of a single OBU are separated by time-duplexing (TDD), the process proceeds in the order of message transmission, message reception, and response, resulting in slot waste and latency issues. To address these problems, there is a growing need for full-duplexing technology, which can reduce round-trip delay (RTT) by processing transmission and reception simultaneously within a single OBU, thereby enabling rapid negotiation and coordination between vehicles and increasing actual spectrum efficiency.

[0003] Korean Published Patent No. 10-2020-0127833 discloses a method for transmitting and receiving control signals and data in a side link, but does not disclose a method for using full-duplex technology in a side link.

[0004] Therefore, research is needed on methods for transmitting and receiving signals using full-duplex technology in wireless communication systems that support sidelinks. Prior art literature

[0005] Korean Patent Publication No. 10-2020-0127833 The problem to be solved

[0006] This project (result) is the result of the Regional Innovation-Centered University Support System (RISE) carried out with funding from the Ministry of Education and Chungcheongbuk-do and supported by the Chungbuk RISE Center in 2025 (2025-RISE-11-004-02).

[0007] In other words, the purpose of this specification is to provide a full duplexing method capable of simultaneously performing transmission and reception between vehicles in the sidelink of V2X communication.

[0008] Furthermore, the present specification aims to provide a method for recovering a received signal by eliminating self-interference caused by the transmitted signal while simultaneously transmitting a transmitted signal, using a Reference Signal (RS) that is orthogonal to the signal transmission and signal reception, respectively, in an OBU that uses spatially separated transmitting and receiving antennas in a transmitting chain and a receiving chain.

[0009] The technical problems to be solved by the present invention are not limited to those mentioned above, and other technical problems not mentioned will be clearly understood by those skilled in the art to which the present invention belongs from the description below. means of solving the problem

[0010] The present specification describes a method for transmitting and receiving signals in a wireless communication system that supports a sidelink, wherein the method performed by a first wireless device comprises: performing sidelink discovery for discovering a wireless device to perform sidelink communication; determining a first wireless resource for transmitting a physical sidelink control channel (PSCCH) including a first sidelink control information (SCI) including sidelink scheduling information, and a second wireless resource for transmitting a physical sidelink shared channel (PSSCH) including a second SCI and a transport block; transmitting the PSCCH to a second wireless device over the determined first wireless resource; and transmitting the first PSSCH to the second wireless device over the determined second wireless resource. The method includes the step of receiving a second PSSCH from the second wireless device on the second wireless resource determined above, wherein the sidelink scheduling information includes resource allocation information for the first PSSCH, and the second wireless resource includes one or more symbols for full duplex operation capable of simultaneous transmission and reception.

[0011] In addition, the present specification further includes the step of transmitting setting information related to the DMRS (demodulation reference signal) setting of the second wireless device to the second wireless device.

[0012] In addition, the setting information in the present specification is characterized by including DMRS pattern information of the second wireless device.

[0013] In addition, the above setting information in the specification is characterized by being included in the first SCI.

[0014] In addition, the side link scheduling information in this specification is characterized by further including resource allocation information for the second PSSCH.

[0015] Additionally, the method described herein further comprises the steps of: transmitting a first DMRS to the second wireless device; and receiving a second DMRS from the second wireless device.

[0016] Additionally, the step of receiving the second PSSCH in this specification comprises: a step of estimating magnetic interference occurring at the receiver of the first wireless device due to a transmission signal from the transmitter of the first wireless device using the first DMRS; a step of removing the estimated magnetic interference from the received signal of the second PSSCH received at the receiver of the first wireless device; and a step of decoding the second PSSCH using the second DMRS for the signal from which the magnetic interference has been removed from the received signal of the second PSSCH.

[0017] Additionally, the present specification describes a first wireless device for transmitting and receiving signals in a wireless communication system that supports a sidelink, comprising: a memory; and a transceiver for transmitting and receiving wireless signals to and from the outside. and includes a processor functionally connected to the memory and the transceiver to control the overall operation of the first wireless device, wherein the processor performs sidelink discovery to discover a wireless device to perform sidelink communication, determines a first wireless resource for transmitting a physical sidelink control channel (PSCCH) including a first sidelink control information (SCI) including sidelink scheduling information, and a second wireless resource for transmitting a physical sidelink shared channel (PSSCH) including a second SCI and a transport block, transmits the PSCCH to the second wireless device over the determined first wireless resource, transmits the first PSSCH to the second wireless device over the determined second wireless resource, and controls the reception of the second PSSCH from the second wireless device over the determined second wireless resource, wherein the sidelink scheduling information includes resource allocation information for the first PSSCH, and the second wireless resource is a full-duplex capable of simultaneous transmission and reception. It is characterized by including one or more symbols for a duplex operation.

[0018] In addition, the processor in this specification is characterized by controlling the transmission of setting information related to the DMRS (demodulation reference signal) setting of the second wireless device to the second wireless device.

[0019] Additionally, in this specification, the processor is characterized by transmitting a first DMRS to the second wireless device and controlling the reception of a second DMRS from the second wireless device.

[0020] Additionally, in this specification, the processor is characterized by using the first DMRS to estimate magnetic interference occurring at the receiver of the first wireless device due to a transmission signal from the transmitter of the first wireless device, removing the estimated magnetic interference from the received signal of the second PSSCH received at the receiver of the first wireless device, and using the second DMRS to decode the second PSSCH for the signal from which the magnetic interference has been removed from the received signal of the second PSSCH, thereby controlling the reception of the second PSSCH. Effects of the invention

[0021] In this specification, through full-duplexing technology that enables simultaneous transmission and reception between vehicles in the sidelink of V2X communication, it is possible to reduce Round-Trip Time (RTT), rapidly perform negotiation and coordination between vehicles, and reduce waste of wireless resources, thereby effectively increasing spectrum efficiency.

[0022] The effects obtainable from the present invention are not limited to those mentioned above, and other unmentioned effects will be clearly understood by those skilled in the art from the description below. Brief explanation of the drawing

[0023] The accompanying drawings, which are included as part of the detailed description to aid in understanding the present invention, provide embodiments of the present invention and explain the technical features of the present invention together with the detailed description. Figure 1 shows the types of V2X applications. Figure 2 is a figure showing an example of a method of operation of a terminal according to a resource allocation mode in a side link. FIG. 3 is a figure showing an example of a side link resource allocation mode 1 to which the method proposed in this specification can be applied. FIG. 4 is a figure showing an example of a side link resource allocation mode 2 to which the method proposed in this specification can be applied. FIG. 5 shows an example of a conceptual diagram of a wireless communication system to which the method proposed in this specification can be applied. FIG. 6 shows an example of an internal block diagram of a wireless device in which the method proposed in this specification can be implemented. FIG. 7 shows an example of a conceptual diagram of a wireless communication system operating in full-duplex communication in a V2X sidelink as proposed in this specification. FIG. 8 is a flowchart illustrating an example of a method for performing full-duplex communication in a side link proposed in this specification. FIG. 9 is a figure showing an example of the allocation of RS sets orthogonal to signal transmission and signal reception proposed in this specification in a resource grid. FIG. 10 is a flowchart illustrating an example of a full-duplex communication method in a side link proposed in this specification. FIG. 11 is a flowchart illustrating an example of a method for transmitting and receiving signals in a wireless communication system that supports a side link as proposed in this specification. Specific details for implementing the invention

[0024] The technical terms used in this specification are merely for describing specific embodiments. Hereinafter, preferred embodiments according to the present invention are described in detail with reference to the accompanying drawings. The detailed description disclosed below, together with the accompanying drawings, is intended to describe exemplary embodiments of the present invention and is not intended to represent the only embodiment in which the present invention may be practiced. The following detailed description includes specific details to provide a complete understanding of the present invention. However, those skilled in the art will know that the present invention may be practiced without such specific details.

[0025] In some cases, to avoid obscuring the concept of the present invention, known structures and devices may be omitted or illustrated in the form of a block diagram focusing on the core functions of each structure and device.

[0026] In the following, the downlink (DL) refers to communication from a transmitter (e.g., base station) to a receiver (e.g., terminal), and the uplink (UL) refers to communication from a receiver to a transmitter.

[0027] Specific terms used in the following description are provided to aid in understanding the present invention, and the use of such specific terms may be modified in other forms without departing from the technical spirit of the present invention.

[0028] The following technologies can be utilized in various radio access systems such as CDMA (code division multiple access), FDMA (frequency division multiple access), TDMA (time division multiple access), OFDMA (orthogonal frequency division multiple access), SC-FDMA (single carrier frequency division multiple access), and NOMA (non-orthogonal multiple access). CDMA can be implemented using radio technologies such as UTRA (universal terrestrial radio access) or CDMA2000. TDMA can be implemented using radio technologies such as GSM (global system for mobile communications), GPRS (general packet radio service), and EDGE (enhanced data rates for GSM evolution). OFDMA can be implemented using radio technologies such as IEEE 802.11 (Wi-Fi), IEEE 802.16 (WiMAX), IEEE 802-20, and E-UTRA (evolved UTRA). UTRA is part of the UMTS (universal mobile telecommunications system). 3GPP (3rd generation partnership project) LTE (long term evolution) is part of E-UMTS (evolved UMTS) using E-UTRA, employing OFDMA in the downlink and SC-FDMA in the uplink. LTE-A (advanced) is an evolution of 3GPP LTE.

[0029] 5G NR (new radio) defines eMBB (enhanced Mobile Broadband), mMTC (massive Machine Type Communications), URLLC (Ultra-Reliable and Low Latency Communications), and V2X (vehicle-to-everything) according to usage scenarios. Furthermore, the 5G NR standard is classified into standalone (SA) and non-standalone (NSA) based on the co-existence between the NR system and the LTE system. Additionally, 5G NR supports various subcarrier spacings, CP-OFDM in the downlink, and CP-OFDM and DFT-s-OFDM (SC-OFDM) in the uplink.

[0030] Embodiments of the present invention may be supported by standard documents disclosed in at least one of the wireless access systems IEEE 802, 3GPP, and 3GPP2. That is, steps or parts among the embodiments of the present invention that are not described in order to clearly reveal the technical concept of the present invention may be supported by said documents. In addition, all terms disclosed in this document may be explained by said standard documents.

[0031] For clarity of explanation, the description focuses on 3GPP LTE / LTE-A / NR (New Radio), but the technical features of the present invention are not limited thereto.

[0032] In this specification, "an operation (e.g., a transmission operation) being set in a communication node" may mean that "setting information for said operation (e.g., an information element, a parameter)" and / or "information directing the performance of said operation" is signaled to said communication node. In other words, "an operation (e.g., a transmission operation) being set in a communication node" may mean that said communication node receives "setting information for said operation (e.g., an information element, a parameter)" and / or "information directing the performance of said operation." "An information element (e.g., a parameter) being set in a communication node" may mean that said information element is signaled to said communication node (e.g., said communication node receiving said information element). The signaling may be at least one of SI (system information) signaling (e.g., transmission of SIB (system information block) and / or MIB (master information block)), RRC signaling (e.g., transmission of RRC parameters and / or upper layer parameters), MAC CE (control element) signaling, or PHY signaling (e.g., transmission of DCI (downlink control information), UCI (uplink control information), and / or SCI (sidelink control information).

[0033] Resource elements constituting the frame structure in the time domain may include subframes, slots, minislots, symbols, etc. Subframes can be used as units for transmission, measurement, etc., and the length of a subframe may have a fixed value (e.g., 1 ms) regardless of the subcarrier interval. Slots may contain consecutive symbols (e.g., 14 OFDM symbols). The length of a slot may be variable, unlike the length of a subframe. For example, the length of a slot may be inversely proportional to the subcarrier interval.

[0034] Slots may be used as units for transmission, measurement, scheduling, resource allocation, timing (e.g., scheduling timing, HARQ (hybrid automatic repeat request) timing, CSI (channel state information) measurement and reporting timing, etc.). The length of actual time resources used for transmission, measurement, scheduling, resource allocation, etc. may or may not match the length of the slot. Mini-slots may contain consecutive symbol(s), and the length of a mini-slot may be shorter than the length of a slot. Mini-slots may be used as units for transmission, measurement, scheduling, resource allocation, timing, etc. Mini-slots (e.g., mini-slot length, mini-slot boundaries, etc.) may be predefined in the technical specifications. Alternatively, mini-slots (e.g., mini-slot length, mini-slot boundaries, etc.) may be configured (or instructed) to the terminal. The use of a mini-slot when specific conditions are satisfied may be configured (or instructed) to the terminal. Mini-slots may be explicitly distinguished by the technical specifications. Alternatively, the mini slot(s) may mean a set(s) of symbols designated for the aforementioned use.

[0035] A base station can schedule data channels (e.g., PDSCH (physical downlink shared channel), PUSCH (physical uplink shared channel), PSSCH (physical sidelink shared channel)) using some or all of the symbols constituting a slot. In particular, for Ultra Reliable Low Latency Communication (URLC) transmission, unlicensed band transmission, transmission in a coexistence situation between NR communication systems and LTE communication systems, and analog beamforming-based multi-user scheduling, a data channel may be transmitted using a portion of a slot. Additionally, a base station can schedule data channels using multiple slots. Furthermore, a base station can schedule data channels using at least one mini-slot.

[0036] In the frequency domain, elements constituting the frame structure may include resource blocks (RBs), subcarriers, etc. A single RB may include consecutive subcarriers (e.g., 12 subcarriers). The number of subcarriers constituting a single RB may be constant regardless of the numerator. In this case, the bandwidth occupied by a single RB may be proportional to the subcarrier spacing of the numerator. RBs may be used as units for transmission and resource allocation, such as data channels and control channels. Resource allocation for data channels may be performed at the level of RBs or RB groups (e.g., resource block groups (RBGs)). A single RBG may include one or more consecutive RBs. Resource allocation for control channels may be performed at the level of control channel elements (CCEs). In the frequency domain, a single CCE may include one or more RBs. In a communication system, a slot (e.g., slot format) may be composed of a combination of one or more segments among a downlink (DL) segment, a flexible segment (or unknown segment), and an uplink (UL) segment. Each of the downlink segment, the flexible segment, and the uplink segment may be composed of one or more consecutive symbols. The flexible segment may be located between the downlink segment and the uplink segment, between the first downlink segment and the second downlink segment, between the first uplink segment and the second uplink segment, etc. When the flexible segment is inserted between the downlink segment and the uplink segment, the flexible segment may be used as a protection segment.

[0037] A slot may include one or more flexible segments. Alternatively, a slot may not include any flexible segments. A terminal may perform a predefined operation in a flexible segment. Alternatively, a terminal may perform a semi-static or periodically configured operation by a base station in a flexible segment. For example, an operation periodically configured by a base station may include a PDCCH (physical downlink control channel) monitoring operation, SS / PBCH (synchronization signal / physical broadcast channel) block reception and measurement operation, CSI-RS (channel state information-reference signal) reception and measurement operation, downlink SPS (semi-persistent scheduling) PDSCH reception operation, SRS (sounding reference signal) transmission operation, RACH (physical random access channel) transmission operation, a periodically configured PUCCH transmission operation, and a PUSCH transmission operation according to a configured grant (CG). A flexible symbol may be overridden by a downlink symbol or an uplink symbol. If a flexible symbol is overridden by a downlink or uplink symbol, the terminal may perform a new operation instead of the existing operation on the said flexible symbol (e.g., the overridden flexible symbol).

[0038] The slot format can be semi-fixed by upper-layer signaling (e.g., radio resource control (RRC) signaling). Information indicating the semi-fixed slot format may be included in system information, and the semi-fixed slot format can be set cell-specifically. Additionally, the semi-fixed slot format can be additionally set per terminal through terminal-specific upper-layer signaling (e.g., RRC signaling). The flexible symbols of the cell-specific slot format can be overridden as downlink symbols or uplink symbols by the terminal-specific upper-layer signaling. Furthermore, the slot format can be dynamically indicated by physical layer signaling (e.g., the slot format indicator (SFI) included in downlink control information (DCI)). The semi-fixed slot format can be overridden by the dynamically indicated slot format. For example, the semi-fixed flexible symbols can be overridden as downlink symbols or uplink symbols by the SFI.

[0039] A base station and / or terminal can perform downlink operations, uplink operations, sidelink operations, etc., in a bandwidth part. A bandwidth part may be defined as a set of consecutive RBs (e.g., physical resource blocks (PRBs)) in a frequency domain having a specific numerator. The RBs constituting a single bandwidth part may be consecutive in the frequency domain. A single numerator may be used for signal transmission (e.g., transmission of a control channel or data channel) in a single bandwidth part.

[0040] In this specification, "signal" may refer to any physical signal and channel when used in a broad sense. A terminal performing an initial connection procedure may obtain configuration information for the initial bandwidth portion from a base station through system information. A terminal operating in an RRC connected state may obtain configuration information for the bandwidth portion from a base station through terminal-specific upper layer signaling.

[0041] The configuration information for a bandwidth portion may include numerical values ​​applied to the bandwidth portion (e.g., subcarrier spacing and / or CP length). Additionally, the configuration information for a bandwidth portion may further include information indicating the location of the starting RB (e.g., starting PRB) of the bandwidth portion and information indicating the number of RBs (e.g., PRB) constituting the bandwidth portion. Among the bandwidth portion(s) configured in the terminal, at least one bandwidth portion may be activated. For example, within a single carrier, one uplink bandwidth portion and one downlink bandwidth portion may each be activated. In a time division duplex (TDD) based communication system, a pair of uplink bandwidth portions and downlink bandwidth portions may be activated. A base station may configure multiple bandwidth portions in the terminal within a single carrier and may switch the active bandwidth portion of the terminal.

[0043] V2X (Vehicle-to-Everything) communication

[0044] Hereinafter, we will examine V2X communication applicable to the method proposed in this specification.

[0045] V2X communication includes communication between vehicles and all entities, such as V2V (Vehicle-to-Vehicle), referring to communication between vehicles; V2I (Vehicle-to-Infrastructure), referring to communication between a vehicle and an eNB or RSU (Road Side Unit); V2P (Vehicle-to-Pedestrian), referring to communication between a vehicle and a terminal carried by an individual (pedestrian, cyclist, vehicle driver, or passenger); and V2N (Vehicle-to-Network).

[0046] V2X communication may have the same meaning as (V2X) sidelink or NR V2X, or may have a broader meaning that includes (V2X) sidelink or NR V2X.

[0047] V2X communication can be applied to various services, such as forward collision warning, automatic parking systems, Cooperative adaptive cruise control (CACC), loss of control warning, traffic congestion warning, safety warning for vulnerable road users, emergency vehicle alerts, speed warnings for driving on curved roads, and traffic flow control.

[0048] V2X communication may be provided via a PC5 interface and / or a Uu interface. In this case, the wireless communication system supporting V2X communication may include specific network entities to support communication between the vehicle and all entities. For example, the network entities may be an eNB, a RSU (roadside unit), a terminal, or an application server (e.g., a traffic safety server).

[0049] In addition, a terminal performing V2X communication may refer not only to a general handheld UE, but also to a vehicle UE, a pedestrian UE, an eNB-type RSU, a UE-type RSU, a robot equipped with a communication module, etc.

[0050] V2X communication can be performed directly between terminals or through the network entity(s). V2X operation modes can be distinguished according to the method of performing such V2X communication.

[0051] Terms used in V2X communication are defined as follows.

[0052] A Road Side Unit (RSU): An RSU (Road Side Unit) is a V2X service-enabled device capable of transmitting and receiving with moving vehicles using V2I services.

[0053] In addition, RSU is a fixed infrastructure entity that supports V2X applications and can exchange messages with other entities that support V2X applications.

[0054] Pseudonymity: Conditions under which the processing of personally identifiable information (PII) is no longer provided to a specific subscriber without further use of additional information, provided that such additional information is maintained separately and there are technical and organizational measures to ensure non-attribution to the identified or identifiable subscriber.

[0055] RSU is a term frequently used in existing ITS specifications, and the reason for introducing this term into 3GPP specifications is to make documents easier to read in the ITS industry.

[0056] An RSU is a logical entity that combines V2X application logic with the functions of an eNB (referred to as an eNB-type RSU) or a UE (referred to as a UE-type RSU).

[0057] V2I Service: A type of V2X service where one side is a vehicle and the other is an entity belonging to infrastructure.

[0058] V2P Service: A V2X service type where one side is a vehicle and the other is a device carried by an individual (e.g., a portable terminal carried by a pedestrian, cyclist, driver, or passenger).

[0059] V2X Service: A type of 3GPP communication service involving a transmitting or receiving device in a vehicle.

[0060] Depending on the counterpart participating in the communication, it can be further divided into V2V services, V2I services, and V2P services.

[0061] V2X enabled UE: A UE that supports V2X services.

[0062] V2V Service: A type of V2X service where both parties to the communication are vehicles.

[0063] V2V Communication Range: The range of direct communication between two vehicles participating in a V2V service.

[0064] V2X Application Support Types

[0065] As seen, V2X applications, called V2X (Vehicle-to-Everything), have four types: (1) Vehicle-to-Vehicle (V2V), (2) Vehicle-to-Infrastructure (V2I), (3) Vehicle-to-Network (V2N), and (4) Vehicle-to-Pedestrian (V2P).

[0066] Figure 1 shows the types of V2X applications.

[0067] These four types of V2X applications can use "cooperative awareness" to provide more intelligent services for end users.

[0068] This means that entities such as vehicles, roadside infrastructure, application servers, and pedestrians can collect knowledge about the local environment (e.g., information received from other nearby vehicles or sensor equipment) to process and share that knowledge in order to provide more intelligent information, such as cooperative collision warnings or autonomous driving.

[0069] These intelligent transport services and related message sets are defined in automotive SDOs outside of 3GPP.

[0070] Three basic classes for providing ITS services: road safety, traffic efficiency, and other applications are described, for example, in ETSI TR 102 638 V1.1.1: "Vehicular Communications; Basic Set of Applications; Definitions".

[0071] 3GPP handles only the transmission of these messages to support various types of V2X applications.

[0073] sidelink resource allocation

[0074] In the side link, we examine resource allocation methods or resource allocation modes.

[0075] One or more sidelink resource pools are established in the terminal by higher layer signaling. The sidelink resource pools are for transmitting or receiving PSSCH and may be associated with sidelink resource allocation mode 1 or sidelink resource allocation mode 2.

[0076] In the frequency domain, the sidelink resource pool consists of consecutive subchannels, and the consecutive subchannels are indicated by the sl-NumSubchannel field. The subchannels consist of consecutive PRBs, and the consecutive PRBs are indicated by the sl-SubchannelSize field. Here, sl-NumSubchannel and sl-SubchannelSize are upper-level parameters.

[0077] Figure 2 is a figure showing an example of a method of operation of a terminal according to a resource allocation mode in a side link.

[0078] More specifically, FIG. 2a shows a terminal operation related to sidelink resource allocation mode 1, and FIG. 2b shows a terminal operation related to sidelink resource allocation mode 2.

[0079] In the case of sidelink resource allocation mode 1, the base station can schedule sidelink resources to be used by the terminal for sidelink transmission.

[0080] The base station performs resource scheduling for terminal 1 through PDCCH (more specifically, DCI), and terminal 1 performs sidelink communication with terminal 2 according to the said resource scheduling. Terminal 1 transmits sidelink control information (SCI) to terminal 2 through a physical sidelink control channel (PSCCH), and then transmits data based on the said SCI through a physical sidelink shared channel (PSSCH).

[0081] While control information transmitted by a base station to a terminal via PDCCH is called DCI (downlink control information), control information transmitted by a terminal to another terminal via PSCCH can be called SCI. SCI can transmit sidelink scheduling information. There may be various formats for SCI; for example, there may be SCI format 1 and SCI format 2.

[0082] Referring to FIG. 2a, in sidelink resource allocation mode 1, the base station performs resource scheduling for terminal 1 via PDCCH (more specifically DCI) (S210), and terminal 1 performs a sidelink with terminal 2 according to the said resource scheduling. Terminal 1 transmits sidelink control information (SCI) to terminal 2 via physical sidelink control channel (PSCCH) (S220), and then transmits data based on the said SCI via physical sidelink shared channel (PSSCH) (S230).

[0084] FIG. 3 is a figure showing an example of a side link resource allocation mode 1 to which the method proposed in this specification can be applied.

[0085] Referring to FIG. 3, in sidelink resource allocation mode 1, dynamic grant, configured grant type 1, and configured grant type 2 are supported for PSSCH and PSCCH transfers. Sidelink transfers of configured grant type 2 are semi-persistently scheduled by SL grants in valid active DCIs.

[0086] The terminal transmits the PSSCH in the same slot as the associated PSCCH, and the minimum resource allocation unit in the time domain is the slot.

[0087] Additionally, the terminal transmits PSSCH as consecutive symbols within the slot according to the following restrictions.

[0088] The terminal does not transmit PSSCH at symbols not configured as a sidelink, and within the slot, PSSCH resource allocation starts at the Sl-StartSymbol+1 symbol, and the terminal does not transmit PSSCH at the last symbol configured as a sidelink.

[0089] In addition, for sidelink dynamic grants, PSSCH transmission is scheduled by DCI format 3_0, and for sidelink configured grant type 2, the configured grant is enabled by DCI format 3_0.

[0090] K SL represents the slot offset between the DCI slot and the first sidelink transmission scheduled by the DCI, and T slot represents the SL slot duration.

[0091] Furthermore, in the frequency domain, the sidelink resource allocation unit is the sub-channel. Sub-channel allocation for sidelink transmission is determined using the Frequency resource assignment field in the associated SCI.

[0092] The lowest sub-channel of the sidelink transmission is the sub-channel where the lowest PRB of the associated PSCCH is transmitted.

[0093] Referring to FIG. 2b, in the case of sidelink resource allocation mode 2, the terminal can determine a sidelink transmission resource within a sidelink resource set by a base station (or network) or a pre-set sidelink resource. The set sidelink resource or pre-set sidelink resource may be a resource pool. For example, in the case of sidelink resource allocation mode 2, the terminal can autonomously select a sidelink resource for transmission. For example, in the case of sidelink resource allocation mode 2, the terminal can assist in selecting a sidelink resource for another terminal. For example, in the case of sidelink resource allocation mode 2, the terminal can receive an NR configured grant for sidelink transmission. For example, in the case of sidelink resource allocation mode 2, the terminal can schedule sidelink transmission for another terminal. Also, sidelink resource allocation mode 2 can support the reservation of a sidelink resource for at least blind retransmission.

[0094] Procedures related to sensing and resource (re)selection may be supported in sidelink resource allocation mode 2. The sensing procedure may be defined as decoding an SCI from another terminal and / or sidelink measurement. Decoding the SCI in the sensing procedure may provide information about a sidelink resource indicated by at least the terminal transmitting the SCI. When the SCI is decoded, the sensing procedure may use an L1 SL RSRP measurement based on SL DMRS. The resource (re)selection procedure may use the result of the sensing procedure to determine a resource for sidelink transmission.

[0095] As shown in Fig. 4, a method in which the transmission resource for the next packet is also reserved can be used for the selection of the transmission resource.

[0096] Referring to FIG. 2b, in sidelink resource allocation mode 2, the terminal can schedule resources on its own. More specifically, the terminal can perform a sidelink operation after selecting resources on its own within a selection window through a sensing / SCI decoding process, etc. Terminal 1 transmits SCI to Terminal 2 via PSCCH (S240), and then transmits data based on the said SCI via PSSCH (S250).

[0097] In sidelink resource allocation mode 2, the terminal receives a resource selection mechanism allowed through upper layer signaling and can select a resource to perform a sidelink operation.

[0098] The above upper layer signaling is SL-PBPS-CPS-Config IE (Information Element), which represents operational information for a resource pool that can be configured to enable full sensing only, partial sensing only, random resource selection only, or any combination thereof.

[0099] The sl-AllowedResourceSelectionConfig parameter included in the above upper layer signaling indicates the allowed resource selection mechanism. That is, the resource selection mechanism may be any one of full sensing only, partial sensing only, random resource selection only, or any combination thereof.

[0101] FIG. 4 is a figure showing an example of a side link resource allocation mode 2 to which the method proposed in this specification can be applied.

[0102] Referring to FIG. 4, when selecting a resource for the initial transmission, a resource for retransmission may be reserved at regular time intervals (time gap). The terminal can identify transmission resources reserved by other terminals or resources being used by other terminals through sensing within a sensing window, and after excluding them within a selection window, can randomly select a resource from among the remaining resources that have less interference.

[0103] For example, within a sensing window, the terminal can decode a PSCCH containing information about the period of reserved resources and measure the PSSCH RSRP from resources periodically determined based on the PSCCH. The terminal can exclude resources whose PSSCH RSRP values ​​exceed a threshold from a selection window. Then, the terminal can randomly select a sidelink resource from among the remaining resources within the selection window.

[0104] Alternatively, the terminal may determine resources with low interference (e.g., resources corresponding to the bottom 20%) by measuring the Received Signal Strength Indication (RSSI) of periodic resources within a sensing window. The terminal may also randomly select a sidelink resource from among the resources included in the selection window among the periodic resources. For example, if the terminal fails to decode PSCCH, the terminal may use the above method.

[0105] SL-SensingWindow is defined by the internal parameter T0 and is defined by the number of slots corresponding to SL-SensingWindow msec.

[0107] FIG. 5 shows an example of a conceptual diagram of a wireless communication system to which the method proposed in this specification can be applied.

[0108] Referring to FIG. 5, the wireless communication system (10) includes a wireless device (100, 100'), a base station (200), and a network (300).

[0109] The base station (200) and the network (300) can be implemented as wireless devices, and a specific wireless device can operate as a base station / network node in relation to another wireless device.

[0110] A wireless device (100, 100') represents a device that performs communication using Radio Access Technology (RAT) (e.g., 4G, 5G, 6G, etc.). The wireless device may include a vehicle, a robot, a portable device, an Internet of Things (IoT) device, and an Artificial Intelligence (AI) device.

[0111] In this specification, a wireless device may be referred to as a terminal or User Equipment (UE). A terminal may include, for example, a mobile phone, a smartphone, a laptop computer, a digital broadcasting terminal, a PDA (Personal Digital Assistant), a PMP (Portable Multimedia Player), a navigation system, a slate PC, a tablet PC, an ultrabook, a vehicle, a vehicle with autonomous driving capabilities, a connected car, a UAV, an AI module, a robot, an AR device, or a VR device.

[0112] A wireless device (100, 100') can be connected to a network (300) through a base station (200). AI technology can be applied to the wireless device, and the wireless device can be connected to an AI device through the network (300).

[0113] Wireless devices (100, 100') may communicate with each other through a base station (200) / network (300), but may also communicate directly (e.g., sidelink communication) without going through a base station (200) / network (300).

[0114] For example, vehicles (100, 100') can communicate directly with each other (e.g., V2V (Vehicle-to-Vehicle) / V2X (Vehicle-to-everything) communication).

[0115] Wireless communication / connections may be established between wireless devices and / or between wireless devices and base stations and / or between base stations. Here, wireless communication / connections may be established through various RATs (e.g., 5G, 6G, etc.), such as uplink / downlink communication, sidelink communication (or D2D (Device-To-Device) communication), and communication between base stations (e.g., relay, IAB (Integrated Access and Backhaul)). Through wireless communication / connections, wireless signals may be transmitted / received from each other between wireless devices and base stations, and between wireless devices. For example, wireless communication / connections may transmit / receive signals through various physical channels. To this end, based on various proposals in this specification, at least some of the following may be performed: a process for setting various configuration information for transmitting / receiving wireless signals, various signal processing processes (e.g., channel encoding / decoding, modulation / demodulation, resource mapping / demapping, etc.), and resource allocation processes.

[0117] FIG. 6 shows an example of an internal block diagram of a wireless device in which the method proposed in this specification can be implemented.

[0118] Referring to FIG. 6, the first wireless device (100) and the second wireless device (100', 200) can transmit and receive wireless signals through various wireless access technologies (e.g., LTE, NR).

[0119] The first wireless device may be a vehicle, and the second wireless device may be a vehicle or a base station.

[0120] The first wireless device (100) may include one or more processors (110) and one or more memories (120). The first wireless device may additionally include one or more transceivers (130) and / or one or more antennas (140). The processor may control the memory and / or transceivers. The processor may be configured to implement the descriptions, functions, procedures, proposals, methods, and / or operation flowcharts disclosed herein. For example, the processor may process information in memory to generate a first information / signal and then transmit a wireless signal containing the first information / signal through a transceiver. Additionally, the processor may receive a wireless signal containing a second information / signal through a transceiver and then process the second information / signal to store the obtained information in memory. The memory may be connected to the processor and may store various information related to the operation of the processor. For example, memory may store software code containing instructions for performing some or all of the processes controlled by the processor, or for performing the descriptions, functions, procedures, proposals, methods, and / or flowcharts of operations disclosed herein. Here, the processor and memory may be part of a communication modem / circuit / chip designed to implement a RAT (e.g., LTE, NR). A transceiver may be connected to the processor and may transmit and / or receive wireless signals through one or more antennas. The transceiver may include a transmitter and / or receiver. The transceiver may be interchangeably referred to as an RF module. In this specification, the first wireless device may refer to a communication modem / circuit / chip.

[0121] The second wireless device (100', 200) may include one or more processors (210) and one or more memories (220). The second wireless device may additionally include one or more transceivers (230) and / or one or more antennas (240). The processor may control the memory and / or transceivers. The processor may be configured to implement the descriptions, functions, procedures, proposals, methods, and / or operation flowcharts disclosed herein. For example, the processor may process information in memory to generate a third information / signal and then transmit a wireless signal containing the third information / signal through a transceiver. Additionally, the processor may receive a wireless signal containing a fourth information / signal through a transceiver and then process the fourth information / signal to store the obtained information in memory. The memory may be connected to the processor and may store various information related to the operation of the processor. For example, memory may store software code containing instructions for performing some or all of the processes controlled by the processor, or for performing the descriptions, functions, procedures, proposals, methods, and / or flowcharts of operations disclosed herein. Here, the processor and memory (204) may be part of a communication modem / circuit / chip designed to implement a RAT (e.g., LTE, NR). A transceiver may be connected to the processor and may transmit and / or receive wireless signals through one or more antennas. The transceiver may include a transmitter and / or receiver. The transceiver may be interchangeable with an RF module. In this specification, the second wireless device may refer to a communication modem / circuit / chip.

[0123] Hereinafter, a method for transmitting and receiving signals using full duplexing in a V2X sidelink proposed in this specification will be examined in detail with reference to the relevant drawings.

[0124] 1 used in this specification st-stage SCI (sidelink control information) is transmitted over the PSCCH (Physical Sidelink Control Channel) and includes sidelink scheduling information. The above 1 st -stage SCI may be referred to as the first stage SCI, the first SCI, SCI 1, etc., and for convenience in this specification, it will be referred to as the 'first SCI'.

[0125] The first SCI formats are PSSCH (Physical Sidelink Shared Channel) and 2 nd Includes SCI format 1-A used for scheduling SCI and SCI format 1-B used for scheduling SL PRS for a dedicated SL PRS (Sidelink Positioning Reference Signal) resource pool.

[0126] The above 2 nd - SCI is transmitted over PSSCH and transmits sidelink scheduling information and inter-UE coordination-related information. The above 2 nd The sidelink scheduling information included in the SCI includes information related to HARQ operations, such as information for decoding PSSCH and HARQ-ACK information.

[0127] The above 2 nd -SCI may be referred to as the second stage SCI, the second SCI, SCI 2, etc., and for convenience in this specification, it will be referred to as the 'second SCI'.

[0128] The second SCI format may include SCI format 2-A, SCI format 2-B, SCI format 2-C, and SCI format 2-D.

[0129] FIG. 7 shows an example of a conceptual diagram of a wireless communication system operating in full-duplex communication in a V2X sidelink as proposed in this specification.

[0130] In the case of 5G NR V2X (or sidelink), half-duplexing communication using the TDD method is used. That is, one On-Board Unit (OBU) transmits a signal to another OBU in transmission mode, and after a certain period of time, switches to reception mode to receive a signal from the other OBU.

[0131] The OBU implemented in the wireless device proposed in this specification uses spatially separated transmitting and receiving antennas to enable far-field communication in the transmitting RF chain and the receiving RF chain, and is connected to transmit transmission symbols from the transmitter to the receiver in the baseband. The transmitter (or transmitting unit) and the receiver (or receiving unit) may be included in a transceiver.

[0132] In FIG. 7, the first wireless device (or UE0) (100) transmits a symbol At the same time, transmitting through the TX0 transmitting antenna (141), the symbol through the RX0 receiving antenna (142) It is received as shown in mathematical formula 1 below.

[0133]

[0134] Mathematical formula 1, is a wireless channel coefficient from the TX1 transmitting antenna (241) of the second wireless device (or UE1) (100') to the RX0 receiving antenna (142) of the first wireless device (100), and is the transmission signal of the first wireless device (100) It corresponds to a self-interference signal caused by.

[0135] And, the second wireless device (100') is a transmission symbol At the same time as transmitting through the TX1 transmitting antenna (241), through the RX1 receiving antenna (242) It is received as shown in mathematical formula 2 below.

[0136]

[0137] In mathematical formula 2, is a wireless channel coefficient from the TX0 transmitting antenna (141) of the first wireless device (100) to the RX1 receiving antenna (242) of the second wireless device (100'), and is the transmission signal of the second wireless device It corresponds to a self-interference signal caused by.

[0138] The first wireless device receives the symbol The transmission symbol of the second wireless device in To recover the self-interference signal must be estimated and removed. At the same time, the second radio device receives the symbol The transmission symbol of the first wireless device in To recover the self-interference signal ...must be estimated and removed.

[0140] FIG. 8 is a flowchart illustrating an example of a method for performing full-duplex communication in a side link proposed herein. Specifically, FIG. 8 illustrates a flowchart of a full-duplexing communication method that estimates magnetic interference occurring in a wireless device and removes the estimated magnetic interference to recover a received symbol. In particular, at the receiver of the first wireless device, the received symbol Self-interference signal Estimating and removing it, the transmission symbol of the second wireless device It represents the process of restoring.

[0141] To implement the method proposed in FIG. 8, the wireless device may additionally include a channel estimation unit (150), an interference reconstruction unit (160), a (self) interference removal unit (170), and a symbol detection unit (180) in addition to the memory and the transceiver. The channel estimation unit, the interference reconstruction unit, the interference removal unit, and the symbol detection unit may be described as processes performed by the processor of the wireless device shown in FIG. 6, but for convenience of explanation, the channel estimation unit, the interference reconstruction unit, the interference removal unit, and the symbol detection unit will be used for the following description.

[0142] Referring to FIG. 8, the channel estimation unit (150) of the first wireless device uses the RS (Reference Signal) set R0 assigned to the first wireless device to determine the self-interference wireless channel from the TX0 transmitting antenna (141) to the RX0 receiving antenna (142). Estimate, and the estimated value (or estimate) It transmits to the interference reconstruction unit (160) of the first wireless device. At the same time, using the RS set R1 assigned to the second wireless device, the wireless channel from the TX1 transmitting antenna (241) of the second wireless device to the RX0 receiving antenna (142) of the first wireless device Estimate and the estimated value The first wireless device and the second wireless device each use RS set R0 and RS set R1, respectively. In order to ensure orthogonality between them, R0 and R1 are predefined to have different REs (Resource Elements) that do not overlap as elements (or wireless resources), and the wireless device initiating unicast communication (e.g., the first wireless device) uses R0, and the other wireless device (e.g., the second wireless device) uses R1. The determined RS is shared with the other wireless device through the first SCI transmission.

[0143] The interference reconstruction unit (160) of the first wireless device receives the transmission symbol transmitted from the transmission unit of the first wireless device. and the estimated value generated by the channel estimation unit (150) Using, the self-interference estimate as shown in Equation 3 below Reconstructs.

[0144]

[0145] Mathematical Equation 3, transmitted symbols through a bridge transmitting data from the baseband transmitter of the first wireless device to the baseband receiver is delivered.

[0146] The interference removal unit (170) of the first wireless device is the self-interference estimated value reconstructed by the interference reconstruction unit (160). Received symbols using For , remove self-interference as shown in Equation 4 below. Creates.

[0147]

[0148] The symbol estimation unit (180) of the first wireless device is generated in the interference removal unit (170). Demodulate the transmission symbol of the second wireless device Estimate and the estimated value Generates. Since the first wireless device and the second wireless device use mutually orthogonal RS sets when transmitting data simultaneously, the first wireless device is not subject to interference from the second wireless device when estimating the self-interference channel, so the self-interference channel estimate value The actual channel It is quite close to, and due to this Some magnetic interference remains, but at a negligible level. Therefore, as magnetic interference is sufficiently eliminated through the method described in FIG. 8, the first wireless device transmits the transmitted symbols from the second wireless device It becomes possible to estimate.

[0149] Received symbol in the receiver of the second wireless device Self-interference Estimate and remove the transmission symbol of the first wireless device The process of restoring it can also be performed in the same way as the process examined earlier.

[0151] FIG. 9 is a figure showing an example of the allocation of RS sets orthogonal to signal transmission and signal reception proposed in this specification in a resource grid.

[0152] Referring to FIG. 9, the resource grid is represented as a slot in the time domain and a Resource Block (RB) in the frequency domain, and one slot can contain 14 OFDM symbols and one RB can contain 12 subcarriers.

[0153] In FIG. 9, the resource area (121), excluding the area where PSCCH DMRS is transmitted from the 1st OFDM symbol (OFDM symbol 0) to the 3rd OFDM symbol (OFDM symbol 2), is the area where PSCCH (Physical Sidelink Control Channel) is transmitted, and the wireless device on the PSCCH has a 1st SCI (or 1 st Transmits -stage SCI).

[0154] In FIG. 9, the resource region (122) corresponding to the 4th OFDM symbol (OFDM symbol 3) to the 7th OFDM symbol (OFDM symbol 6) is a section that operates in half-duplexing mode (or a section that supports half-duplex communication), and the first wireless device (e.g., UE0) on the PSSCH the 2nd SCI (or 2 nd -stage SCI) and a Transport Block (TB) (or data) are transmitted, and the second wireless device receives a PSSCH containing the second SCI and Transport Block transmitted by the first wireless device. At this time, the second wireless device (e.g., UE1) uses the Demodulation Reference Signals (DMRS) transmitted by the first wireless device at the fourth OFDM symbol to [establish] a wireless channel from the TX0 transmitting antenna (141) of the first wireless device to the RX1 receiving antenna (242) of the second wireless device. Estimate. The symbols included in the section operating in half-duplex mode may be represented as symbols that do not operate in full-duplex mode, symbols that do not support full-duplex communication, and non-SBFD (subband full duplex) symbols.

[0155] In FIG. 9, the resource area (123) corresponding to the 8th OFDM symbol (OFDM symbol 7) to the 14th OFDM symbol (OFDM symbol 13) is a section operating in full-duplexing mode (or a section supporting full-duplex communication), whereby the first wireless device transmits the second SCI and transmission block over the PSSCH, and simultaneously, the second wireless device also transmits the second SCI and transmission block over the PSSCH. The symbols included in the section operating in full-duplexing mode can be represented as symbols operating in full-duplexing mode, symbols supporting full-duplex communication, or SBFD (subband full duplex) symbols. In the symbols included in the section operating in full-duplexing mode, the first wireless device and the second wireless device can each transmit the PSSCH using different frequency resources (or different RBs or different subbands), etc.

[0156] At this time, the first wireless device and the second wireless device use orthogonal DMRS sets transmitted in the 8th OFDM symbol (OFDM symbol 7) and the 12th OFDM symbol (OFDM symbol 11) to perform the processes of channel estimation in the channel estimation unit of each wireless device, interference reconstruction in the interference reconstruction unit, interference removal in the interference removal unit, and signal demodulation in the symbol detection unit. Since the orthogonal DMRS sets transmitted in the 8th and 12th OFDM symbols each use different REs, orthogonality can be guaranteed, so the wireless channel can be estimated without interference.

[0158] FIG. 10 is a flowchart illustrating an example of a full-duplex communication method in a side link proposed in this specification.

[0159] Referring to FIG. 10, the first wireless device performs sidelink discovery to discover the second wireless device, which is the communication partner, in order to start sidelink unicast communication (S1010). Through step S1010, the first wireless device identifies or confirms relevant information for sidelink communication, and in particular, the first wireless device identifies or confirms information regarding whether the second wireless device, which is the communication partner, is a terminal capable of full duplexing communication, that is, capable of simultaneous transmission and reception.

[0160] Then, the first wireless device searches for a sidelink resource to transmit data (or a transmission block) to the second wireless device, and determines (or selects) a resource for sidelink communication from the searched resources (S1020). In step S1020, the first wireless device has a first SCI (1 st Wireless resources to be used for the PSCCH to transmit the -stage SCI) and the second SCI (2 nd Determine the radio resources to be used for the PSSCH to transmit the -stage SCI) and data (or transmission block). Referring to FIG. 9, the PSCCH can be allocated from the first OFDM symbol to the third OFDM symbol in the time domain, and the PSSCH can be allocated from the fourth OFDM symbol to the fourteenth OFDM symbol.

[0161] In step S1020, the process of determining the wireless resources to be used for PSCCH and the wireless resources to be used for PSSCH can be performed through the sidelink resource allocation mode 1 or sidelink resource allocation mode 2 examined earlier.

[0162] In step S1020, if the first wireless device confirms through step S1010 that the second wireless device is a full-duplex terminal, the first wireless device determines (or selects) the wireless resources to be used for the PSSCH to transmit data with the second SCI. Referring to FIG. 9, it can be seen that the eighth OFDM symbol to the fourteenth OFDM symbol of the assigned RB is assigned to the PSSCH transmission of the second wireless device.

[0163] Additionally, in step S1020, the first wireless device and the second wireless device determine the DMRS pattern assigned to each of them.

[0164] Then, the first wireless device transmits a first SCI on the PSCCH, which includes resource allocation information for the PSSCH of the first wireless device determined in step S1020 and resource allocation information for the PSSCH of the second wireless device (S1030). The first SCI further includes DMRS pattern information assigned to the first wireless device and the second wireless device, respectively, determined in step S1020. Referring to FIG. 9, it can be seen that step S1030, that is, the step of transmitting the PSCCH, is performed in the interval from the first OFDM symbol to the third OFDM symbol of the assigned RB.

[0165] Then, the first wireless device transmits PSSCH to the second wireless device (S1040). This is performed in the interval from the fourth OFDM symbol to the seventh OFDM symbol in FIG. 9, that is, the interval operating in half-duplex mode.

[0166] And, the first wireless device and the second wireless device simultaneously transmit PSSCH to each other (S1050). In FIG. 9, it can be seen that step S1050 is performed in the interval from the eighth OFDM symbol to the fourteenth OFDM symbol, that is, in the interval operating in full-duplex mode, and step S1050 can be performed using different frequency resources in the interval operating in full-duplex mode.

[0168] FIG. 11 is a flowchart illustrating an example of a method for transmitting and receiving signals in a wireless communication system that supports a side link as proposed in this specification.

[0169] Referring to FIG. 11, the first wireless device performs sidelink discovery to discover a wireless device to perform sidelink communication (S1110).

[0170] And, the first wireless device determines a first wireless resource for transmitting a PSCCH (physical sidelink control channel) including a first SCI (sidelink control information) including sidelink scheduling information, and a second wireless resource for transmitting a PSSCH (physical sidelink shared channel) including a second SCI and a transport block (S1120).

[0171] The above side link scheduling information may include resource allocation information for the first PSSCH and resource allocation information for the second PSSCH.

[0172] The second wireless resource may include one or more symbols for full-duplex operation capable of simultaneous transmission and reception.

[0173] The first SCI may further include setting information related to the DMRS (demodulation reference signal) setting of the second wireless device, and the setting information may include DMRS pattern information of the second wireless device.

[0174] And, the first wireless device transmits the PSCCH to the second wireless device over the determined first wireless resource (S1130).

[0175] And, the first wireless device transmits the first PSSCH to the second wireless device over the determined second wireless resource (S1140).

[0176] And, the first wireless device receives the second PSSCH from the second wireless device on the determined second wireless resource (S1150).

[0177] The step of receiving the second PSSCH, which is step S1150, may include the step of estimating magnetic interference occurring at the receiver of the first wireless device due to a transmission signal from the transmitter of the first wireless device using the first DMRS, the step of removing the estimated magnetic interference from the received signal of the second PSSCH received at the receiver of the first wireless device, and the step of decoding the second PSSCH using the second DMRS for the signal from which the magnetic interference has been removed from the received signal of the second PSSCH.

[0178] Additionally, the first wireless device can transmit a first DMRS to the second wireless device prior to step S1140 and receive a second DMRS from the second wireless device.

[0180] The embodiments described above are combinations of the components and features of the present invention in a specific form. Each component or feature should be considered optional unless otherwise explicitly stated. Each component or feature may be implemented in a form not combined with other components or features. Additionally, it is possible to construct embodiments of the present invention by combining some components and / or features. The order of operations described in the embodiments of the present invention may be changed. Some components or features of one embodiment may be included in another embodiment, or may be replaced with corresponding components or features of another embodiment. It is obvious that embodiments may be constructed by combining claims that do not have an explicit citation relationship in the claims, or that they may be included as new claims through amendments made after filing.

[0181] Embodiments according to the present invention may be implemented by various means, for example, hardware, firmware, software, or a combination thereof. In the case of implementation by hardware, an embodiment of the present invention may be implemented by one or more ASICs (application specific integrated circuits), DSPs (digital signal processors), DSPDs (digital signal processing devices), PLDs (programmable logic devices), FPGAs (field programmable gate arrays), processors, controllers, microcontrollers, microprocessors, etc.

[0182] In the case of implementation by firmware or software, an embodiment of the present invention may be implemented in the form of a module, procedure, function, etc., that performs the functions or operations described above. The software code may be stored in memory and executed by a processor. The memory may be located inside or outside the processor and may exchange data with the processor by various known means.

[0183] It is obvious to those skilled in the art that the present invention may be embodied in other specific forms without departing from the essential features of the invention. Accordingly, the foregoing detailed description should not be interpreted restrictively in all respects but should be considered exemplary. The scope of the invention shall be determined by a reasonable interpretation of the appended claims, and all modifications within the equivalent scope of the invention are included within the scope of the invention. Explanation of the symbols

[0184] 10: Wireless communication system

Claims

Claim 1 A method for transmitting and receiving signals in a wireless communication system that supports a sidelink, wherein the method performed by a first wireless device comprises: a step of performing sidelink discovery to discover a wireless device capable of performing sidelink communication; a step of identifying information indicating whether the device supports full-duplex communication capable of simultaneous transmission and reception; a step of determining a first wireless resource for transmitting a PSCCH (physical sidelink control channel) including a first SCI (sidelink control information) including sidelink scheduling information, and a second wireless resource for transmitting a PSSCH (physical sidelink shared channel) including a second SCI and a transport block, wherein the second wireless resource includes one or more symbols that do not support full-duplex communication and one or more symbols that support full-duplex communication; a step of transmitting the PSCCH to a second wireless device on the determined first wireless resource; and a first on one or more symbols that support full-duplex communication of the determined second wireless resource A method comprising: a step of transmitting a PSSCH to the second wireless device; and a step of receiving the second PSSCH from the second wireless device on one or more symbols supporting full-duplex communication of the determined second wireless resource, wherein the sidelink scheduling information includes resource allocation information for the first PSSCH, and the first PSSCH and the second PSSCH are each transmitted and received through different subbands on one or more symbols supporting full-duplex communication. Claim 2 A method according to claim 1, further comprising the step of transmitting setting information related to the DMRS (demodulation reference signal) setting of the second wireless device to the second wireless device. Claim 3 A method according to claim 2, characterized in that the setting information includes DMRS pattern information of the second wireless device. Claim 4 A method according to claim 3, characterized in that the setting information is included in the first SCI. Claim 5 A method according to claim 1, characterized in that the side link scheduling information further includes resource allocation information for the second PSSCH. Claim 6 A method according to claim 3, further comprising the step of transmitting a first DMRS to the second wireless device; and the step of receiving a second DMRS from the second wireless device. Claim 7 A method according to claim 6, wherein the step of receiving the second PSSCH comprises: a step of estimating magnetic interference occurring at the receiver of the first wireless device due to a transmission signal from the transmitter of the first wireless device using the first DMRS; a step of removing the estimated magnetic interference from the received signal of the second PSSCH received at the receiver of the first wireless device; and a step of decoding the second PSSCH using the second DMRS for the signal from which the magnetic interference has been removed from the received signal of the second PSSCH. Claim 8 A first wireless device for transmitting and receiving signals in a wireless communication system that supports sidelink, comprising: a memory; and a transceiver for transmitting and receiving wireless signals to and from the outside. and includes a processor functionally connected to the memory and the transceiver to control the overall operation of the first wireless device, wherein the processor performs sidelink discovery to discover a wireless device to perform sidelink communication, identifies information indicating whether the device supports full-duplex communication capable of simultaneous transmission and reception, determines a first wireless resource for transmitting a physical sidelink control channel (PSCCH) including a first sidelink control information (SCI) including sidelink scheduling information, and a second wireless resource for transmitting a physical sidelink shared channel (PSSCH) including a second SCI and a transport block, wherein the second wireless resource includes one or more symbols that do not support full-duplex communication and one or more symbols that support full-duplex communication, transmits the PSCCH to the second wireless device on the determined first wireless resource, and on one or more symbols of the determined second wireless resource that support full-duplex communication, the first A wireless device characterized by transmitting a PSSCH to the second wireless device and controlling the reception of the second PSSCH from the second wireless device on one or more symbols supporting full-duplex communication of the determined second wireless resource, wherein the sidelink scheduling information includes resource allocation information for the first PSSCH, and the first PSSCH and the second PSSCH are each transmitted and received through different subbands on one or more symbols supporting full-duplex communication. Claim 9 A wireless device according to claim 8, wherein the processor controls the transmission of setting information related to the DMRS (demodulation reference signal) setting of the second wireless device to the second wireless device. Claim 10 A wireless device characterized in that, in claim 9, the setting information includes DMRS pattern information of the second wireless device. Claim 11 A wireless device characterized in that, in claim 10, the setting information is included in the first SCI. Claim 12 A wireless device according to claim 8, characterized in that the side-link scheduling information further includes resource allocation information for the second PSSCH. Claim 13 A wireless device according to claim 10, wherein the processor controls the transmission of a first DMRS to the second wireless device and the reception of a second DMRS from the second wireless device. Claim 14 A wireless device according to claim 13, wherein the processor estimates magnetic interference occurring at the receiver of the first wireless device due to a transmission signal from the transmitter of the first wireless device using the first DMRS, removes the estimated magnetic interference from the received signal of the second PSSCH received at the receiver of the first wireless device, and controls the reception of the second PSSCH by decoding the second PSSCH using the second DMRS for the signal from which the magnetic interference has been removed from the received signal of the second PSSCH.

Images