KR20200031747A - Method and apparatus of transmitting synchronization signal block in V2X sidelink - Google Patents

Abstract

The present invention provides a method for transmitting and receiving a synchronization signal for sharing mutual synchronization in a terminal-to-terminal communication rather than a base station-to-terminal communication in a 3GPP new radio (NR) system. According to an embodiment of the present invention, provided is a method for transmitting a sidelink synchronization signal in a NR V2X sidelink system which sets a parameter of the synchronization signal so that a synchronization signal upon initial connection between terminals in a set user group is not received from a terminal outside the user group.

Description

Method and apparatus for transmitting V2X sidelink synchronization signal {Method and apparatus of transmitting synchronization signal block in V2X sidelink}

The present invention provides a method of transmitting and receiving a synchronization signal for sharing mutual synchronization in a terminal-to-terminal communication rather than a base station-terminal in a 3GPP NR system. In particular, when a group of terminals sharing information between terminals is defined in advance, a method for designing and operating a synchronization signal for synchronization sharing among terminals in a corresponding group is provided.

According to an embodiment of the present invention, in a method of transmitting a sidelink synchronization signal in an NR-V2X sidelink system, the parameters of the synchronization signal are prevented so that a synchronization signal upon initial connection between terminals in a set user group is not received by a terminal outside the user group. It provides a method characterized by setting.

1 is a view showing an example of a form in which several sidelink terminals and terminal groups are mixed in two base stations.
2 is a view showing the configuration of a base station according to another embodiment.
3 is a view showing the configuration of a user terminal according to another embodiment.

Hereinafter, some embodiments of the present invention will be described in detail through exemplary drawings. It should be noted that in adding reference numerals to the components of each drawing, the same components have the same reference numerals as possible even though they are displayed on different drawings. In addition, in describing the present invention, when it is determined that detailed descriptions of related well-known configurations or functions may obscure the subject matter of the present invention, detailed descriptions thereof will be omitted.

In the present specification, a wireless communication system means a system for providing various communication services such as voice and packet data. The wireless communication system includes a user equipment (UE) and a base station (BS).

The user terminal is a comprehensive concept that refers to a terminal in wireless communication, user equipment (UE) in WCDMA, LTE, HSPA and IMT-2020 (5G or New Radio), as well as MS (Mobile Station) in GSM, UT It should be interpreted as a concept including (User Terminal), SS (Subscriber Station), and wireless device.

Base station or cell (Cell) generally refers to a station (station) to communicate with the user terminal, Node-B (Node-B), eNB (evolved Node-B), gNB (gNode-B), LPN (Low Power Node) ), Sector, Site, Antennas of various types, Base Transceiver System (BTS), Access Point, Point (e.g., transmit point, receive point, transmit / receive point), relay node ( Relay Node), mega cell, macro cell, micro cell, pico cell, femto cell, remote radio head (RRH), radio unit (RU), and small cell (small cell).

Since the various cells listed above have a base station that controls each cell, the base station can be interpreted in two ways. 1) a device that provides a mega cell, a macro cell, a micro cell, a pico cell, a femto cell, or a small cell in relation to the wireless area, or 2) the wireless area itself. In 1), all devices that provide a predetermined wireless area are controlled by the same entity or interact to configure the wireless area in a collaborative manner. Points, transmission / reception points, transmission points, reception points, and the like, according to a configuration method of a wireless area, are examples of a base station. In 2), the radio area itself, which receives or transmits a signal from the viewpoint of the user terminal or the neighboring base station, may be directed to the base station.

In this specification, a cell is a component carrier having a coverage of a signal transmitted from a transmission / reception point or a signal transmitted from a transmission / reception point, or a transmission / reception point itself. You can.

In this specification, the user terminal and the base station are two (Uplink or Downlink) transmitting and receiving subjects used to implement the technology or technical idea described in the present invention, and are used in a comprehensive sense and are not limited by terms or words specifically referred to. Does not.

Here, the uplink (Uplink, UL, or uplink) means a method of transmitting and receiving data to the base station by the user terminal, the downlink (Downlink, DL, or downlink) transmits and receives data to the user terminal by the base station Means the way.

For uplink transmission and downlink transmission, a time division duplex (TDD) method transmitted using different times may be used, and a frequency division duplex (FDD) method, TDD method, and FDD method transmitted using different frequencies may be used. Mixing methods can be used.

In addition, in a wireless communication system, an uplink and a downlink are configured based on one carrier or a pair of carriers to configure a standard.

Uplink and downlink transmit control information through control channels such as PDCCH (Physical Downlink Control CHannel), PUCCH (Physical Uplink Control CHannel), and PDSCH (Physical Downlink Shared CHannel), PUSCH (Physical Uplink Shared CHannel), etc. It consists of the same data channel and transmits data.

Downlink (downlink) may mean a communication or communication path from a multiple transmit and receive point to a terminal, and uplink (uplink) may mean a communication or communication path from a terminal to a multiple transmit and receive point. At this time, in the downlink, the transmitter may be a part of multiple transmission / reception points, and the receiver may be a part of the terminal. In addition, in the uplink, the transmitter may be a part of the terminal, and the receiver may be a part of multiple transmission / reception points.

Hereinafter, a situation in which signals are transmitted / received through channels such as PUCCH, PUSCH, PDCCH and PDSCH is also described in the form of 'transmit and receive PUCCH, PUSCH, PDCCH and PDSCH'.

Meanwhile, the High Layer Signaling described below includes RRC signaling for transmitting RRC information including RRC parameters.

The base station performs downlink transmission to the terminals. The base station is a physical downlink for transmitting downlink control information such as scheduling required for reception of a downlink data channel, which is a main physical channel for unicast transmission, and scheduling grant information for transmission in an uplink data channel. The control channel can be transmitted. Hereinafter, the transmission and reception of signals through each channel will be described as a form in which the corresponding channel is transmitted and received.

There are no restrictions on the multiple access technique applied in a wireless communication system. Time Division Multiple Access (TDMA), Frequency Division Multiple Access (FDMA), Code Division Multiple Access (CDMA), Orthogonal Frequency Division Multiple Access (OFDMA), Non-Orthogonal Multiple Access (NOMA), OFDM-TDMA, OFDM-FDMA, Various multiple access techniques such as OFDM-CDMA can be used. Here, NOMA includes SCMA (Sparse Code Multiple Access) and LDS (Low Density Spreading).

One embodiment of the present invention is to allocate resources such as asynchronous wireless communication evolving to LTE / LTE-Advanced, IMT-2020 via GSM, WCDMA, HSPA, and synchronous wireless communication fields evolving to CDMA, CDMA-2000 and UMB. Can be applied.

In this specification, a Machine Type Communication (MTC) terminal may mean a terminal supporting low cost (or low complexity) or a terminal supporting coverage enhancement. Or, in this specification, the MTC terminal may mean a terminal defined as a specific category for supporting low cost (or low complexity) and / or coverage enhancement.

In other words, in this specification, the MTC terminal may mean a newly defined 3GPP Release-13 low cost (or low complexity) UE category / type that performs LTE-based MTC-related operations. Alternatively, in this specification, the MTC terminal supports enhanced coverage compared to the existing LTE coverage, or UE category / type defined under the existing 3GPP Release-12 or lower supporting low power consumption, or the newly defined Release-13 low cost (or low complexity) UE category / type. Or, it may mean a further enhanced MTC terminal defined in Release-14.

In this specification, the NB-IoT (NarrowBand Internet of Things) terminal means a terminal supporting wireless access for cellular IoT. The objectives of the NB-IoT technology include improved indoor coverage, support for large-scale low-speed terminals, low sensitivity, ultra-low-cost terminal costs, low power consumption, and optimized network architecture.

As a representative usage scenario in New Radio (NR), which is currently being discussed in 3GPP, enhanced Mobile BroadBand (eMBB), Massive Machine Type Communication (mMTC), and Ultra Reliable and Low Latency Communication (URLLC) have been proposed.

In this specification, frequency, frame, subframe, resource, resource block, region, band, subband, control channel, data channel, synchronization signal, various reference signals, various signals, various messages related to NR (New Radio) Can be interpreted as meaning used in the past or present or various meanings used in the future.

Meanwhile, in the following description, a technical idea is described based on two nodes, a terminal and a base station, but this is only for convenience of understanding, and the same technical idea may be applied between the terminal and the terminal. For example, the base station described below is described by exemplarily describing one node that communicates with the terminal, and may be replaced with another terminal or infrastructure device that performs communication with the terminal, if necessary.

That is, the present technical idea may be applied not only to communication between a terminal and a base station, but also to communication between terminals (Device to Device), side link communication (Sidelink), and vehicle communication (V2X). In particular, it can also be applied to communication between terminals in a next-generation radio access technology, and terms such as a signal and a channel of the present specification can be variously modified and applied according to the type of communication between terminals.

For example, the terms PSS and SSS may be changed and applied to primary D2D Synchronization Signal (PSSS) and Secondary D2D Synchronization Signal (SSSS) in communication between terminals. In addition, the channel for transmitting broadcast information such as PBCH described above is changed to PSBCH, the channel for transmitting data in the sidelink such as PUSCH and PDSCH is changed to PSSCH, and the channel for transmitting control information such as PDCCH and PUCCH is changed to PSCCH. Can be applied. Meanwhile, a discovery signal is required in communication between terminals, which is transmitted and received through PSDCH. However, it is not limited to these terms.

Hereinafter, in this specification, the technical idea will be described based on exemplary communication between the terminal and the base station, but the base station node may be replaced with another terminal as necessary to apply the technical idea.

In the conventional 3GPP LTE, a sidelink transmission / reception method for supporting V2X communication, which is a concept of fusion of D2D between terminals and V2V as an inter-vehicle communication and V2I as a vehicle-to-base station communication, is an additional feature. It is standardized as. In more distinction, D2D is a service scenario that assumes communication between existing terminals in an equal relationship, and V2V is an extended terminal-to-terminal communication service scenario that assumes a wireless communication environment between a vehicle and a vehicle with different characteristics. In order to successfully utilize radio resources with or without the assistance of a base station, various technologies have been standardized in initial access and resource allocation.

Among these, in relation to the initial access technology, a side link newly defines a synchronization signal that allows a user who can receive only the user's signal to perform the initial connection. This is structurally the same as the signal that the base station radiated, but in addition to the three different types of primary synchronization signal (PSS) signals used in the existing signal, two additional types of PSS signals are defined, and each user in cell coverage, It was defined as a PSS signal that can be transmitted by a user outside cell coverage. That is, LTE's PSS is largely as follows.

● PSS 1, 2, and 3: PSS emitted by the base station. In the form of minimizing the interference of neighboring base stations, parameters are selected and set in terms of implementation

● PSS # 4: PSS emitted by a terminal that synchronizes with an external infrastructure such as a base station. If there is no other terminal emitting 4 PSS in the vicinity, it is regulated to emit only when the detected RSRP is below a certain threshold.

● PSS 5: PSS emitted by an independent terminal that is not synchronized with the external infrastructure. Likewise, it is regulated to emit only when there is no other terminal emitting PSS 5 in the vicinity.

Meanwhile, in NR, studies are underway for standardizing V2X related to sidelink support and changed service requirements, and the following four new service scenarios are assumed.

● Vehicles Platooning enables the vehicles to dynamically form a platoon traveling together. All the vehicles in the platoon obtain information from the leading vehicle to manage this platoon. These information allow the vehicles to drive closer than normal in a coordinated manner, going to the same direction and traveling together.

● Extended Sensors enables the exchange of raw or processed data gathered through local sensors or live video images among vehicles, road site units, devices of pedestrian and V2X application servers. The vehicles can increase the perception of their environemnt beyond of what their own sensors can detect and have a more broad and holistic view of the local situation. High data rate is one of the key characteristics.

● Advanced Driving enables semi-automated or full-automated driving. Each vehicle and / or RSU shares its own perception data obtained from its local sensors with vehicles in proximity and that allows vehicles to synchronize and coordinate their trajectories or manoeuvres. Each vehicle shares its driving intention with vehicles in proximity too.

● Remote Driving enables a remote driver or a V2X application to operate a remote vehicle for those passengers who cannot drive by themselves or remote vehicles located in dangerous environments. For a case where variation is limited and routes are predictable, such as public transportation, driving based on cloud computing can be used. High reliability and low latency are the main requirements.

Among the above scenarios, in the case of vehicle platooning, it is a service scenario in which a large number of pre-agreed users, which can be defined as one user group in terms of service, need to perform a large amount of data transmission and reception in real time through a side link. This is a service scenario in which multiple sensing terminals attached to a single device or system are connected by a sidelink wireless link and operate like a single unit. It can be said that both are clearly predefined user groups that need to be defined.

When a user group is configured, side link communication may be divided into communication between user groups and communication within a user group. Group-to-group communication is usually a group leader, for example, in the case of vehicle platooning, the leading vehicle or the extended sensor, the control module that manages each local sensor can typically communicate, and in this case, the rest of the group configuration terminals wirelessly through the reader. You can manage resources and communicate indirectly. The reader configures a link between terminals between groups of members and forms a network based on radio transmission resources allocated from base stations and the like for communication within the group. Currently, in the NR V2X study, initial discussions regarding necessary configuration technologies for each service scenario are being made, and discussions regarding communication within a user group and between groups and detailed procedures for this have not been made.

In the service scenario in which a user group exists, when the synchronization signal is classified only within / outside of the existing case, an external user who does not belong to the corresponding user group may detect a synchronization signal to be used for initial access of the users in the group. The user cannot receive or radiate another synchronization signal due to the synchronization signal of the network to which the user cannot participate, and as a result, a problem that the sidelink cannot be accessed may occur. Accordingly, there is a need to enable the synchronization signal for network configuration in the group to be distinguished when an external user attempts an initial connection. However, in the side link standard of LTE, since a terminal emitting a synchronization signal is directly or indirectly in cell coverage or not, it is transmitted separately. Therefore, it is impossible for an external terminal to distinguish such a signal in a synchronization signal detection step.

The present invention provides a synchronization signal management and transmission method for initial access when configuring a radio link network between users in a group in the NR-V2X sidelink system. In particular, a synchronization signal design method is provided in which external users and other user groups irrelevant to a group receive the corresponding synchronization signal.

The present invention provides (1) a method for setting a synchronization signal parameter , (2) a method for setting a synchronization signal resource , and (3) a method for transmitting and operating a synchronization signal according to a situation . The term used to describe the present invention may be used later, other terms having the same meaning may be used, it is to explain the role of the actual object and not to limit the scope of the technology.

Prior to the description of the operation of the invention, a few items assumed in the invention are described.

First, it is assumed that two adjacent base stations g1 and g2 exist. It is also assumed that the users u1 and u2 are connected to the network within the coverage of g1 and g2, respectively. In addition, it is assumed that two terminals u11 and u12 constituting a user group such as u1 exist, and terminals u21 and u22 constituting a user group such as u2 exist. In addition, it is assumed that u3 and u4 terminals exist that are not connected to the corresponding terminals and are not connected to the base station. This system is illustrated in FIG. 1.

Here, the solid line range is the coverage of each base station, and the dotted line range is assumed to be the signal arrival ranges of each of u1 and u2. As you can see, u2 and u3 are within the transmission range of the u1 signal, and u1, u3 and u4 are within the transmission range of the u2 signal. In addition, it is assumed that u1 and u2 respectively transmit a synchronization signal to synchronize synchronization among their group members.

1 is a diagram illustrating only one example for describing an assumed situation and a scenario, and does not limit the scope of application of the method provided in the present invention.

(1) Synchronization signal parameter setting method : This method is a method of constructing a PSS for a new use not defined in the existing LTE. In the existing NR, since one PSS is composed of three parameters having different values, a total of three PSSs exist, and two PSSs for in-coverage / out-coverage applied to the LTE sidelink can be additionally defined. The method provided by the present invention further relates to a method of defining a PSS parameter for synchronizing mutual synchronization between users in a group.

① Single parameter application method: This method is a method of adding only one parameter value candidate for PSS and setting only one PSS candidate for synchronization among users in the group. In this case, all user groups set the same PSS value, and a user without a group to which they belong does not need to search for the PSS defined by the corresponding parameter. In this case, different groups are distinguished by interpreting the rest of the Synchronization Signal Block (SSB) based on the transmitted PSS and acquiring additional user ID information. In the above example, u1 and u2 transmit the same PSS, and each user determines which user the corresponding SSB is from in the SSS or the like decoded based on the transmitted PSS. Through this method, u3 and u4 can exclude a synchronization signal transmitted by u1 and u2 and emit a synchronization signal by itself to establish a sidelink connection if necessary.

② Multiple parameter application method: This method is a method of adding two or more parameter value candidates for a PSS targeting a user in a group. In the above example, u1 and u2 are the types in which each sync signal causes interference, and the user in each user group must always decode the two signals and track the ID. However, this complexity is reduced if u1 and u2 use different PSSs. However, when there are multiple candidates, there is a need to prepare a procedure for determining parameters to be applied.

First, for each possible candidate, there is a method of performing RSRP measurement to determine whether the corresponding PSS is transmitted to the surroundings and randomly selecting and transmitting a parameter having the lowest or sufficiently low received power measured without any other notice. In this case, the receiving end should attempt to detect all possible candidate groups, and in order to reduce the detection complexity, candidates that can be selected in advance can be limited. In one embodiment, the index value of the parameter may be determined in advance and set to search up to k sequentially in the corresponding index.

As another method, there is a method in which a base station connected to a corresponding terminal designates SSB configuration related parameters to be used by the terminal through a PDCCH, a group common PDCCH or an RRC message. The corresponding parameter may indicate only one or multiple, and other users who do not perform SSB transmission of the user group to which the corresponding user belongs may receive the corresponding information from the base station and perform synchronization. The user may receive an RRC message or perform blind detection.

As another method, there is a method of configuring parameters with values determined depending on a user group ID or a representative user ID. Similarly, only one may be determined, or several may be determined.

(2) Synchronization signal resource setting method : This method relates to a method of configuring a time / frequency resource region using a sidelink synchronization signal when two or more different purpose SSBs are configured in one terminal. It can be largely divided into a method of utilizing an existing SSB transmission area and a method of securing a new SSB transmission area.

① How to utilize the existing SSB transmission area: SSB defined in NR is fixed in the position of the symbol in the frame in chapter 4.1 of TS38.213, and the SSB is transmitted using some or all of them. The transmitted frame is transmitted as Remaining Minimum System Information (RMSI). When SSBs having different purposes are transmitted from one terminal, information related to each location may be delivered. The specific delivery method is as follows.

First, there is a method of designating a location in RMSI by treating the terminal for any purpose in the same way. For example, if the first SSB in 1, 2, 3 of the SSB deployment candidate positions indexed as 1, 2, 3, 4, 5, 6, 7, 8, and the second SSB in 4, 5, 6 are transmitted, the RMSI is 1, 2, 3, 4, 5, and 6 can be specified by specifying the area in which the SSB is transmitted.

As another method, RMSI information of different areas indicated by different SSBs transmits only their own locations. In the example above, RMSIs of 1, 2, and 3 can be specified by specifying 1, 2, and 3 as SSBs, and RMSIs of 4, 5, and 6 are designated as 4, 5, and 6 as SSBs. have. In this case, the terminal that detects only the first or second SSB has a problem in that the SSB area can be read as data when a resource is allocated to a slot through which the counterpart SSB is transmitted. The ambiguity can be excluded by using a method of additionally transmitting data, or by filling a whole area with different SSBs in the case of sidelinks or using a method of not transmitting data even if there is no SSB transmission in the corresponding area.

In another way, different SSBs can be standardized to be transmitted crosswise within a period. Since the NR currently has an even number of transmission region candidates within one period, when two SSBs are transmitted, it can be divided in half. It may be divided into first half and second half, or may be divided into an odd-numbered index and an even-numbered index. In chapter 4.1 of TS38.213, it may be classified by whether the parameter n is defined to be an odd / even number of parameters n. It might be. In each, the RMSI may transmit actual transmission information of the entire SSB or information related to the actual transmission area of the SSB corresponding to itself.

② How to secure a new SSB transmission area: This method is to allow SSB to be transmitted at a location other than the location defined in chapter 4.1 of TS38.213. The candidate for the location may be specified according to the standard, or may be delivered to the RRC from the base station and other sidelink terminals. The specific method is as follows.

First, a method that can be specified in the standard is a method of additionally defining a symbol in which an SSB can exist in one frame, such as chapter 4.1 of TS38.213. For example, there is a method to increase the candidates of n, so in addition to defining n as 0,1,2,3 in Case A, n = 4,5,6,7 or n = 5,6,7,8 Alternatively, in case B, n may be defined as n = 2,3 or n = 4,5 in addition to defining n as 0,1. Alternatively, an index defined in one or two slots may be additionally secured. For example, in Case B, the positions defined for each n are defined as {4, 8, 16, 20}, and additionally {24} may be defined as a new SSB transmission area.

As another method, a method that can be specified in a standard is to allow SSBs of different purposes to alternately repeat each cycle, rather than repeating each SSB cycle. For this, a shorter period of SSB period can be selected. In this case, when the number of gadgets of the type of SSB to be used is k, the period in which the same SSB repeats is k times the SSB period.

As another method, a method of transmitting to RRC is a method of specifying a location by transmitting time or frequency location related information of a SSB defined for a special purpose. The resource to which the corresponding SSB is transmitted to the user who has not been delivered is judged as a data frame of another user, but the user who has received the corresponding information can successfully identify and receive the SSB. The specific location in the frame may be transmitted to perform a role as a reference signal, or only the frequency location may be transmitted to be referred for estimation of synchronization when reconnecting later.

(3) Synchronous signal transmission and operation method according to the situation : The scenario of FIG. 1 shows a scenario in which a group sidelink communication supported by a base station is performed. In this case, as shown in FIG. 1, when two groups controlled by different base stations are adjacent, unlike when one base station controls, additional operations for interference control may be controlled. Specifically, it can be divided into an information sharing technique through direct communication between base stations and an override through terminal feedback. In addition, a method for an operation, such as handover, in which one terminal operates over two base stations may also be defined.

① Method of processing terminal parameters through communication between base stations: This method is when the base station drops SSB-related parameters to be used by the terminal, but does not exist in its own coverage but exists in the neighboring base station coverage, so that other user information that may collide with each other is possible. It is a method to set the corresponding parameter after obtaining it. That is, a procedure in which a base station transmits information related to a set value of a terminal to which an adjacent base station has assigned a related parameter to another base station may be considered. For example, in FIG. 1, g1 and g2, which know in advance that u1 and u2 are in an adjacent relationship so that they do not use the same parameter, transmit the parameter-related information set in u1 and u2, respectively, set each time or periodically to the other side. You can.

② Method of processing terminal parameters through terminal feedback: This method is a method of uploading parameter change feedback to a base station when a signal of the same parameter transmitted by another terminal is detected while operating the SSB parameter set by the terminal. The terminal may directly attempt SSB detection or may determine that a signal of the same parameter is being transmitted nearby based on information transmitted by a terminal having a history of SSB detection among its groups. Therefore, the corresponding method may be divided into a method in which a terminal directly communicating with a base station raises parameter detection / change feedback to the base station and a terminal indirectly communicating with a base station through another terminal raises detection / change feedback to the corresponding terminal. The feedback message may consist of a collision report only, a specific parameter proposal form, or a collision and interference signal related information form. In particular, when the reception strength or specific beam information of the interference signal is obtained, the corresponding parameter may be reported to the base station to provide auxiliary information for parameter change.

③ How to perform terminal parameter maintenance during handover: If communication between groups is continuous, such as in a Platooning scenario, the SSB parameter used by the terminal that transmits the synchronization signal is transferred rather than randomly changed according to the handover. It is efficient to keep the set value as possible. Therefore, the terminal may transmit its set value to the base station when performing random access or immediately thereafter. The method used at this time is not a change request defined in ②, but a form of notifying information on the value of one's own parameter, and the base station can authorize it or instruct a parameter change based on the information. In the case of permission, it can be silent, or it can feed back a confirmation message.

The methods provided in the present invention are basically described based on sidelink transmission of NR, but the method can be applied to all environments in which group communication based on a synchronization signal is performed. In addition, the methods (1), (2), (3) and the respective sub-methods can be applied independently of each other in combination.

Through the method provided by the present invention, it is possible to perform more efficient link connection in a group in a V2X sidelink communication environment performing group-based communication. Specifically, a new type of group-based synchronization signal capable of performing the corresponding effect may be transmitted and received and a control procedure therefor may be performed.

2 is a view showing the configuration of a base station 1000 according to another embodiment.

2, the base station 1000 according to another embodiment includes a control unit 1010, a transmitting unit 1020, a receiving unit 1030.

The control unit 1010 is a method for transmitting a sidelink synchronization signal in the NR-V2X sidelink system required to perform the above-described present invention, the synchronization signal at the time of initial connection between terminals in a set user group is a terminal outside the user group Controls the overall operation of the base station 1000 according to a method characterized in that the parameters of the synchronization signal are set so as not to be received at.

The transmitting unit 1020 and the receiving unit 1030 are used to transmit and receive signals, messages, and data necessary to perform the present invention described above.

3 is a diagram showing the configuration of a user terminal 1100 according to another embodiment.

Referring to FIG. 3, the user terminal 1100 according to another embodiment includes a reception unit 1110, a control unit 1120, and a transmission unit 1130.

The reception unit 1110 receives downlink control information, data, and messages from a base station through a corresponding channel.

In addition, the control unit 1120 in the method of transmitting the sidelink synchronization signal in the NR-V2X sidelink system required to perform the present invention described above, the synchronization signal at the time of initial connection between terminals in the set user group is outside the user group Controls the overall operation of the user terminal 1100 according to the method characterized in that the parameter of the synchronization signal is set so as not to be received by the terminal.

The transmitter 1130 transmits uplink control information, data, and a message to the base station through a corresponding channel.

In addition, the terms "system", "processor", "controller", "component", "module", "interface", "model", "unit", etc. are generally computer related entity hardware, a combination of hardware and software, It can mean software or running software. For example, the components described above may be, but are not limited to, processes, processors, controllers, control processors, entities, threads of execution, programs and / or computers driven by a processor. For example, both an application running on a controller or processor and a controller or processor can be a component. One or more components can be in a process and / or thread of execution, and the components can be located on one system or deployed to more than one system.

The standard contents or standard documents mentioned in the above-described embodiments are omitted to simplify the description of the specification and constitute a part of the specification. Therefore, it is to be construed that adding the contents of the above standard contents and parts of the standard documents to the specification or in the claims falls within the scope of the present invention.

The above description is merely illustrative of the technical idea of the present invention, and those skilled in the art to which the present invention pertains may make various modifications and variations without departing from the essential characteristics of the present invention. Therefore, the embodiments disclosed in the present invention are not intended to limit the technical spirit of the present invention, but to explain them, and the scope of the technical idea of the present invention is not limited by these embodiments. The scope of protection of the present invention should be interpreted by the claims below, and all technical spirits within the scope equivalent thereto should be interpreted as being included in the scope of the present invention.

Claims (1)

In the method of transmitting the sidelink synchronization signal in the NR-V2X sidelink system,
Method for setting the parameter of the synchronization signal so that the synchronization signal at the time of initial connection between terminals in the set user group is not received at the terminal outside the user group.

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