KR20250102956A - Method and apparatus for pssch transmission for sidelink positioning in wireless communication system - Google Patents

Abstract

A method for transmitting a PSSCH (Physical Sidelink Shared Channel) for sidelink positioning in a wireless communication system according to one aspect of the present disclosure may include a step in which a first terminal determines a first sidelink positioning transmission resource, a step in which the first terminal determines second sidelink positioning transmission resources to be transmitted by second terminals, a step in which the first terminal transmits information about the second sidelink positioning transmission resources to the second terminals, a step in which the first terminal transmits a sidelink positioning reference signal based on the first sidelink positioning transmission resource, and a step in which the PSSCH is transmitted in consideration of the first sidelink positioning transmission resource and the second sidelink positioning transmission resources.

Description

{METHOD AND APPARATUS FOR PSSCH TRANSMISSION FOR SIDELINK POSITIONING IN WIRELESS COMMUNICATION SYSTEM}

The present disclosure relates to a method and device for transmitting a Physical Sidelink Shared Channel (PSSCH) for sidelink positioning in a wireless communication system.

Device-to-Device (D2D) communication refers to direct communication between one terminal and another terminal. Direct communication means that one terminal communicates with another terminal without going through another network device through network control or the terminal's own judgment. This type of terminal-to-terminal communication can be applied to vehicle communication, which is collectively called V2X (vehicle-to-everything). V2X communication refers to a communication method that exchanges or shares information such as traffic conditions while communicating with road infrastructure and other vehicles during driving. V2X-based services may include, for example, autonomous driving services, automobile remote control services, interactive services such as games, and large-capacity short-range audio/video services such as AR or VR. Based on the performance requirements for supporting various V2X-based services through the 5G system, specific technologies additionally required for the Long Term Evolution (LTE) and New Radio (NR) systems, which are radio access technologies (RATs) within the 5G system, are being discussed.

The technical problem of the present disclosure is a method and device for transmitting a PSSCH (Physical Sidelink Shared Channel) for sidelink positioning in a wireless communication system.

An additional technical problem of the present disclosure is a method and device for allocating sidelink positioning reference signal (SL PRS) resources and transmitting a Physical Sidelink Shared Channel (PSSCH) accordingly.

An additional technical problem of the present disclosure is a method and device for configuring a resource pattern for transmitting a sidelink positioning reference signal by a terminal itself and transmitting a PSSCH (Physical Sidelink Shared Channel) accordingly.

An additional technical problem of the present disclosure is a method and device for allowing a terminal to allocate resources for transmitting a sidelink positioning reference signal to another terminal and thereby transmit a PSSCH (Physical Sidelink Shared Channel).

The technical problems to be achieved in the present disclosure are not limited to the technical problems mentioned above, and other technical problems not mentioned will be clearly understood by a person having ordinary skill in the technical field to which the present disclosure belongs from the description below.

A method for transmitting a PSSCH (Physical Sidelink Shared Channel) for sidelink positioning in a wireless communication system according to one aspect of the present disclosure may include a step in which a first terminal determines a first sidelink positioning transmission resource, a step in which the first terminal determines second sidelink positioning transmission resources to be transmitted by second terminals, a step in which the first terminal transmits information about the second sidelink positioning transmission resources to the second terminals, a step in which the first terminal transmits a sidelink positioning reference signal based on the first sidelink positioning transmission resource, and a step in which the PSSCH is transmitted in consideration of the first sidelink positioning transmission resource and the second sidelink positioning transmission resources.

According to the present disclosure, a method for performing sidelink positioning in a wireless communication system can be provided.

According to the present disclosure, a method of allocating sidelink positioning reference signal (SL PRS) resources and transmitting a physical sidelink shared channel (PSSCH) accordingly can be provided.

According to the present disclosure, a method can be provided in which a terminal itself configures a resource pattern for transmitting a sidelink positioning reference signal and transmits a PSSCH (Physical Sidelink Shared Channel) accordingly.

According to the present disclosure, a method can be provided in which a terminal allocates resources for transmitting a sidelink positioning reference signal to another terminal, thereby transmitting a PSSCH (Physical Sidelink Shared Channel).

The effects obtainable from the present disclosure are not limited to the effects mentioned above, and other effects not mentioned will be clearly understood by a person skilled in the art to which the present disclosure belongs from the description below.

FIG. 1 is a diagram illustrating examples of V2X scenarios to which the present disclosure can be applied.
FIG. 2 is a diagram illustrating examples of V2X scenarios to which the present disclosure can be applied.
FIG. 3 is a diagram illustrating examples of V2X scenarios to which the present disclosure can be applied.
FIG. 4 is a diagram illustrating examples of services provided based on side links to which the present disclosure can be applied.
FIG. 5 is a drawing for explaining an NR frame structure to which the present disclosure can be applied.
FIG. 6 is a diagram showing an NR resource structure to which the present disclosure can be applied.
Figure 7 illustrates an example of a V2X resource pool configuration to which the present disclosure can be applied.
Figure 8 illustrates an example of a V2X resource pool configuration to which the present disclosure can be applied.
FIG. 9 is a diagram illustrating a method for performing position measurement based on OTDOA (Observed Time Difference Of Arrival) to which the present disclosure can be applied.
FIG. 10 illustrates a control plane and user plane configuration diagram for NRPP (NR positioning protocol) related to the present invention to which the present disclosure can be applied.
FIG. 11 is a diagram illustrating a method for performing positioning based on a sidelink reference signal to which the present disclosure can be applied.
FIG. 12 is a diagram illustrating a method for performing positioning based on a sidelink reference signal to which the present disclosure can be applied.
FIG. 13 is a diagram illustrating a method for performing positioning based on a sidelink reference signal to which the present disclosure can be applied.
FIG. 14 is a diagram illustrating a method for performing positioning based on a sidelink reference signal to which the present disclosure can be applied.
FIG. 15 is a diagram illustrating a method for performing positioning based on a sidelink reference signal to which the present disclosure can be applied.
FIG. 16 is a diagram illustrating a method for performing positioning based on a sidelink reference signal to which the present disclosure can be applied.
Fig. 17 is a drawing showing a comb pattern applicable to the present disclosure.
FIG. 18 is a diagram illustrating a PSSCH (Physical Sidelink Shared Channel) transmission method that considers transmission of SL PRS of multiple terminals applicable to the present disclosure.
FIG. 19 is a flowchart illustrating a PSSCH (Physical Sidelink Shared Channel) transmission method for sidelink positioning to which the present disclosure is applicable.
FIG. 20 is a drawing showing a base station device and a terminal device to which the present disclosure can be applied.

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

In describing embodiments of the present disclosure, if it is determined that a detailed description of a known configuration or function may obscure the gist of the present disclosure, a detailed description thereof will be omitted. In addition, parts in the drawings that are not related to the description of the present disclosure are omitted, and similar parts are given similar drawing reference numerals.

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

In this disclosure, the terms first, second, etc. are used only for the purpose of distinguishing one component from another component, and do not limit the order or importance among the components unless specifically stated otherwise. Accordingly, within the scope of this disclosure, a first component in one embodiment may be referred to as a second component in another embodiment, and similarly, a second component in one embodiment may be referred to as a first component in another embodiment.

In the present disclosure, the components that are distinguished from each other are intended to clearly explain the characteristics of each, and do not necessarily mean that the components are separated. That is, a plurality of components may be integrated to form a single hardware or software unit, or a single component may be distributed to form a plurality of hardware or software units. Accordingly, even if not mentioned separately, such integrated or distributed embodiments are also included in the scope of the present disclosure.

In the present disclosure, the components described in various embodiments do not necessarily mean essential components, and some may be optional components. Accordingly, an embodiment that consists of a subset of the components described in one embodiment is also included in the scope of the present disclosure. In addition, an embodiment that includes other components in addition to the components described in various embodiments is also included in the scope of the present disclosure.

The present disclosure describes a wireless communication network, and operations performed in the wireless communication network may be performed in a process of controlling the network and transmitting or receiving a signal in a system (e.g., a base station) that manages the wireless communication network, or in a process of transmitting or receiving a signal in a terminal connected to the wireless network.

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

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

The definitions of abbreviations used in this disclosure are as follows.

D2D: Device to Device (communication)

DCI: Downlink Control Information

V2X: Vehicle to X(everything)

V2V: Vehicle to Vehicle

V2P: Vehicle to Pedestrian

V2I/N: Vehicle to Infrastructure/Network

SL: Sidelink

SCI: Sidelink Control Information

SFCI: Sidelink Feedback Control Information

PSSCH: Physical Sidelink Shared Channel

PSBCH: Physical Sidelink Broadcast Channel

PSCCH: Physical Sidelink Control Channel

PSDCH: Physical Sidelink Discovery Channel

PSFICH: Physical Sidelink Feedback Indication Channel

ProSe: (Device to Device) Proximity Services

SLSS: Sidelink Synchronization Signal

PSSID: Physical Sidelink Synchronization Identity

n ^SA _ID : Sidelink group destination identity

N ^SL _ID : Physical sidelink synchronization identity

SA: Scheduling assignment

TB: Transport Block

TTI: Transmission Time Interval

RB: Resource Block

In the following description, the term NR system is used for the purpose of distinguishing the system to which various examples of the present disclosure are applied from conventional systems; however, the scope of the present disclosure is not limited by this term.

For example, the NR system supports various subcarrier spacings (SCS) considering various scenarios, service requirements, and potential system compatibility. In addition, the NR system can support transmission of physical signals/channels through multiple beams to overcome poor channel environments such as high path-loss, phase-noise, and frequency offset occurring on high carrier frequencies. Through this, the NR system can support applications such as eMBB (enhanced Mobile Broadband), mMTC (massive Machine Type Communications)/uMTC (ultra Machine Type Communications), and URLLC (Ultra Reliable and Low Latency Communications). However, although the term NR system is used as an example of a wireless communication system in the present disclosure, the term NR system itself is not limited to these features.

For example, 5G mobile communication technology can be defined. Here, 5G mobile communication technology can be defined to include not only NR systems but also existing LTE-A (Long Term Evolution-Advanced) systems. In other words, 5G mobile communication can be a technology that operates considering not only the newly defined NR system but also backward compatibility with previous systems.

For example, the sidelink field of 5G may include both sidelink in LTE systems and sidelink technology in NR systems. Here, the sidelink field may be an essential field for performance improvement through ultra-high reliability and ultra-low latency, and for grafting new and diverse services.

Hereinafter, for convenience of explanation, the operation and related information for V2X based on the NR system are described. However, the features of the embodiments of the present disclosure may not be applied only to a specific system, and may be equally applied to other systems implemented similarly, and are not limited to the exemplary systems to which the embodiments of the present disclosure are applied.

Next, V2X can be vehicle-based communication. Here, the concept of a vehicle is changing from a simple means of transportation to a new platform. For example, IT technologies are being incorporated into vehicles, and various V2X services are being provided based on this. For example, services such as traffic accident prevention, traffic environment improvement, autonomous driving, and remote driving are being provided. To this end, the need for development and application of sidelink-related technologies in relation to V2X is increasing.

More specifically, with respect to existing communication technologies, communication from a base station to a terminal may be a downlink, and communication from a terminal to a base station may be an uplink. In addition to communication between a base station and a terminal, communication between terminals may be required, and communication from a terminal to a terminal may be a sidelink. For example, with respect to V2X, communication between vehicles or communication between a vehicle and another entity (an entity other than a base station, such as a pedestrian UE (P-UE) or a terminal-type roadside unit (UE-type RSU)) may be a sidelink. That is, in the case of performing vehicle-based communication, sidelink technology can be developed and applied to overcome the limitations of communication between a terminal and a base station.

FIGS. 1 to 3 are diagrams showing examples of V2X scenarios to which the present disclosure can be applied.

Fig. 1 may be a scenario for performing communication based on a side link. Fig. 2 may be a V2X operation scenario using communication between a terminal (or vehicle) and a base station. Fig. 3 may be a scenario for performing V2X operation using both a side link and communication with a base station.

For example, in the description related to V2X, the terminal may be a vehicle. In the description related to V2X, the terminal and the vehicle are collectively referred to as terminals. For example, the terminal may refer to a device capable of performing sidelink and communication with a base station, and may include a vehicle for V2X.

In addition, in relation to V2X, D2D (Device to Device) may mean terminal-to-terminal communication. In addition, ProSe may mean proximity service for a terminal performing D2D communication. In addition, SL (sidelink) may be a sidelink, and SCI (Sidelink Control Information) may mean control information related to the sidelink. In addition, PSSCH (Physical Sidelink Shared Channel) may be a channel through which data is transmitted via the sidelink, and PSCCH (Physical Sidelink Control Channel) may be a channel through which control information is transmitted via the sidelink. In addition, PSBCH (Physical Sidelink Broadcast Channel) may be a channel through which signals are transmitted in a broadcast manner via the sidelink, and system information may be transmitted. In addition, PSFICH (Physical Sidelink Feedback Indication Channel) may be a channel used as a sidelink feedback channel to indicate feedback information. In addition, SLSS (Sidelink Synchronization Signal) may be a synchronization signal for sidelink, and PSSID (Physical Sidelink Synchronization Identity) may be ID information for sidelink synchronization. In addition, n ^SA _ID (Sidelink group destination identity) may be ID information for distinguishing a sidelink group, and N ^SL _ID (Physical sidelink synchronization identity) may be ID information for sidelink synchronization. V2V may mean vehicle-to-vehicle communication, V2P may mean vehicle-to-pedestrian communication, and V2I/N may mean vehicle-to-infrastructure/network communication.

SA, TB, TTI, and RB may be terms used identically to those in existing LTE. For example, in V2X communication, control information transmitted from a terminal to another terminal may be SA. When used in sidelink communication, such control information may be SCI. Here, SCI may be transmitted via PSCCH. In addition, some of SCI may be transmitted via PSCCH, and other parts may be transmitted via PSSCH.

In V2X communication, data transmitted from one terminal to another can be set in TB units. Here, sidelink data can be transmitted through PSSCH.

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

For example, the base station resource scheduling mode may be a resource allocation mode in which a base station (e.g., gNodeB, eNodeB) or a relay node schedules resources used by a terminal to transmit V2X (or direct link) control information and/or data. The terminal may transmit V2X (or direct link) control information and/or data on the indicated resources.

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

In addition, UE autonomous resource selection mode may be a resource allocation mode in which the UE selects resources to be used for transmitting control information and data. The UE's resource selection may be determined by sensing of the UE from a resource pool (i.e., a set of resource candidates). The UE may transmit V2X (or direct link) control information and/or data on the selected resource.

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

The above-described base station resource scheduling mode may be referred to as Mode 1 in sidelink (or direct link) communication for D2D, etc. In addition, the base station resource scheduling mode may be referred to as Mode 3 in sidelink communication for V2X, etc. In addition, the above-described terminal autonomous resource selection mode may be referred to as Mode 2 in sidelink (or direct link) communication for D2D, etc. In addition, the terminal autonomous resource selection mode may be referred to as Mode 4 in sidelink communication for V2X, etc. However, this is only one embodiment, and the scope of the present disclosure is not limited to the name of the resource allocation mode. That is, in the resource allocation mode to which the present disclosure is applicable, for the same target and the same operation, even if the names are different, they can be viewed as the same resource allocation mode.

For example, in NR V2X, the base station resource scheduling mode may be referred to as Mode 1, and the terminal autonomous resource selection mode may be referred to as Mode 2.

Although the embodiments of the present disclosure are described based on V2X communication for convenience of explanation, they are not limited thereto. For example, the present invention can be equally applied to direct link-based communication such as D2D, ProSe, etc.

In addition, V2X may be a general term for V2V, V2P, and V2I/N. Here, each of V2V, V2P, and V2I/N may be defined as in Table 1, but is not limited thereto. That is, Table 1 below is only an example and is not limited thereto.

[Table 1]

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

Table 2 and Fig. 1 may be scenarios that support V2X operation based only on the PC5 interface (or SL). Here, (a) in Fig. 1 may be V2V operation, (b) may be V2I operation, and (c) may be V2P operation. That is, Fig. 1 may be a method of performing communication based on a side link, and may perform communication without a base station.

[Table 2]

Table 3 and Fig. 2 may be scenarios that support V2X operations based only on the Uu interface (i.e., the interface between the UE and the base station). For example, (a) in Fig. 2 may represent V2V operations, (b) may represent V2I operations, and (c) may represent V2P operations. That is, V2X operations may be supported using communication between the terminal and the base station.

[Table 3]

Table 4 and Fig. 3 may be scenarios supporting V2X operations using both the Uu interface and the PC5 interface (or SL). Here, Fig. 3(a) may represent scenario 3A of Table 4, and Fig. 3(b) may represent scenario 3B of Table 4.

Referring to Fig. 3(a), a terminal can transmit a V2X message to other terminals via sidelink. Any one of the terminals receiving the message can transmit a V2X message to a base station via uplink. The base station can receive the V2X message and transmit a message based on the message to other terminals in the vicinity via downlink. For example, the downlink can be performed via a broadcast method.

Referring to Fig. 3(b), a terminal transmits a V2X message to a base station via uplink, and the base station can transmit the message to at least one terminal or RSU. After that, the terminal or RSU that receives the message can transmit the message to multiple surrounding terminals via sidelink.

Both Fig. 3(a) and Fig. 3(b) can support V2X operation by utilizing both communication between the base station and the terminal and sidelink.

[Table 4]

As mentioned above, V2X communication can be done through a base station or through direct communication between terminals. In the case of going through a base station, transmission and reception can be done through the Uu link, which is a communication interface between the LTE base station and terminals in LTE-based V2X communication. In addition, in the case of using a side link as direct communication between terminals, transmission and reception can be done through the PC5 link, which is a communication interface between LTE terminals in LTE-based V2X communication.

For example, in the NR system, V2X communication can be performed using communication between the terminal and the base station and sidelink between the terminals. Here, there may be differences in the communication (uplink/downlink) between the base station and the terminal in the NR system and the communication (uplink/downlink) between the base station and the terminal in the existing system. For example, some features may be similar, and there may be parts that are changed based on the NR system, which is a new system. In addition, the sidelink may also be different between the sidelink in the existing system and the sidelink in the NR system. That is, considering the differences in communication between the base station and the terminal described above, there may also be parts that are changed in the sidelink in the NR system, which is a new system.

FIG. 4 is a diagram illustrating examples of services provided based on side links to which the present disclosure can be applied.

Referring to FIG. 4, V2X-related services or IoT (Internet of Things) services can be provided based on 5G sidelink. Here, 5G sidelink may be a concept that includes both sidelink based on existing LTE system and sidelink considering NR system. In other words, 5G sidelink service may include a service provided by considering one or more of the sidelinks applied in each of LTE and NR systems.

For example, referring to FIG. 4, with respect to V2X services, platooning, automatic driving, advanced sensor, and remote driving services may be provided. Here, platooning may be a technology in which multiple vehicles dynamically form a group and operate similarly. In addition, autonomous driving may be a technology for driving a vehicle based on full automation or semi-automation. In addition, an advanced sensor may be a technology for collecting and exchanging data acquired from a sensor or video image. In addition, remote driving may be a technology for a technology and application for remote control of a vehicle. That is, the aforementioned services may be provided as services based on V2X. However, these services are merely examples, and the services to which the present disclosure is applicable are not limited to the aforementioned specific services. Here, in order to provide various V2X services, requirements such as ultra-low latency, ultra-connectivity, low power, and high reliability may be required. Therefore, in 5G sidelink, an operation method may be required to satisfy V2X services and their requirements, and examples of the present disclosure are described below considering these requirements.

Below, the physical resource structure of the NR system is described.

FIG. 5 is a drawing for explaining an NR frame structure to which the present disclosure can be applied.

The basic unit of time domain in NR is It can be, And, can be. Meanwhile, in LTE, the basic unit of time domain is It can be, can be. The constant for the multiplication relationship between the NR time base unit and the LTE time base unit is can be defined as

Referring to Figure 5, the time structure of the frame for downlink/uplink (DL/UL) transmission is can have. Here, one frame is It consists of 10 subframes corresponding to time. The number of consecutive OFDM symbols in each subframe is may be. In addition, each frame may be divided into two half frames of the same size, half frame 1 may be composed of sub frames 0-4, and half frame 2 may be composed of sub frames 5-9.

Referring to FIG. 5, NTA represents timing advance (TA) between downlink (DL) and uplink (UL). Here, the transmission timing of uplink transmission frame i is determined based on the downlink reception timing at the terminal based on the following mathematical expression 1.

[Mathematical formula 1]

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

FIG. 6 is a diagram showing an NR resource structure to which the present disclosure can be applied.

Resource Elements (REs) within a resource grid can be indexed according to each subcarrier spacing. Here, one resource grid can be created for each antenna port and each subcarrier spacing. Uplink and downlink transmission and reception can be performed based on the corresponding resource grid.

In the frequency domain, one resource block (RB) consists of 12 REs, and an index (nPRB) for one RB can be configured for each of the 12 REs. The index for the RB can be utilized within a specific frequency band or system bandwidth. The index for the RB can be defined as in the following mathematical expression 2. Here, It refers to the number of subcarriers per RB, and k refers to the subcarrier index.

[Mathematical formula 2]

Numerology can be configured in various ways to satisfy various services and requirements of NR systems. For example, unlike existing LTE/LTE-A systems that support one subcarrier spacing (SCS), NR systems can support multiple SCS.

A novel numerology for NR systems including supporting multiple SCSs can operate in a frequency range or carrier such as below 3 GHz, 3 GHz-6 GHz or 6 GHz-52.6 GHz to solve the problem of not being able to use a wide bandwidth in a frequency range or carrier such as conventional 700 MHz or 2 GHz. However, the scope of the present disclosure is not limited thereto.

Table 5 below shows examples of numerals supported by the NR system.

[Table 5]

Referring to Table 5, the numerator can be defined based on the subcarrier spacing (SCS), the cyclic prefix (CP) length, and the number of OFDM symbols per slot used in the Orthogonal Frequency Division Multiplexing (OFDM) system. The above-described values can be provided to the terminal through the upper layer parameters DL-BWP-mu and DL-BWP-cp for the downlink, and through the upper layer parameters UL-BWP-mu and UL-BWP-cp for the uplink.

For example, in Table 5, when the subcarrier spacing setting index (u) is 2, the subcarrier spacing (Δf) is 60 kHz, and normal CP and extended CP can be applied. For other numerology indices, only normal CP can be applied.

A normal slot can be defined as a basic time unit that is basically used to transmit one data and control information in an NR system. The length of a normal slot can be set to the number of 14 OFDM symbols by default. In addition, unlike a slot, a subframe has an absolute time length corresponding to 1 ms in an NR system and can be used as a reference time for the length of other time intervals. Here, a time interval similar to a subframe of LTE may be required in the NR standard for coexistence or backward compatibility of LTE and NR systems.

For example, in LTE, data can be transmitted based on a unit of time, TTI (Transmission Time Interval), and the TTI can be set to one or more subframe units. Here, in LTE, one subframe can be set to 1ms and can include 14 OFDM symbols (or 12 OFDM symbols).

In addition, a non-slot can be defined in NR. A non-slot can mean a slot having a number that is at least one symbol smaller than a normal slot. For example, in the case of providing low latency such as URLLC service, the latency can be reduced through a non-slot having a number of symbols smaller than a normal slot. Here, the number of OFDM symbols included in a non-slot can be determined by considering a frequency range. For example, a non-slot having a length of 1 OFDM symbol can be considered in a frequency range of 6 GHz or higher. As an additional example, the number of OFDM symbols defining a non-slot can include at least 2 OFDM symbols. Here, the range of the number of OFDM symbols included in a non-slot can be set as the length of a mini-slot up to a predetermined length (for example, the normal slot length - 1). However, as a specification of a non-slot, the number of OFDM symbols can be limited to 2, 4, or 7 symbols, but is not limited thereto.

Also, for example, in unlicensed bands below 6 GHz, subcarrier spacing where u corresponds to 1 and 2 may be used, and in unlicensed bands above 6 GHz, subcarrier spacing where u corresponds to 3 and 4 may be used. For example, when u corresponds to 4, it may be used for SSB (Synchronization Signal Block).

[Table 6]

Table 6 shows the number of OFDM symbols per slot for normal CP, by subcarrier spacing setting (u). ), number of slots per frame ( ), number of slots per subframe ( ) are shown. Table 6 shows the above-described values based on a normal slot having 14 OFDM symbols.

[Table 7]

Table 7 shows the number of slots per frame and the number of slots per subframe based on normal slots with 12 OFDM symbols per slot when extended CP is applied (i.e., when u is 2 and the subcarrier spacing is 60 kHz).

In addition, as mentioned above, one subframe may correspond to 1ms on the time axis. In addition, one slot may correspond to 14 symbols on the time axis. For example, one slot may correspond to 7 symbols on the time axis. Accordingly, the number of slots and symbols that can be considered within 10ms corresponding to one radio frame may be set differently. Table 8 may represent the number of slots and symbols according to each SCS. In Table 8, the SCS of 480kHz may not be considered, but is not limited to these examples.

[Table 8]

FIG. 7 and FIG. 8 illustrate examples of V2X resource pool configurations to which the present disclosure can be applied.

Referring to FIGS. 7 and 8, a method of setting up a resource pool for a control channel (PSCCH) through which SA (Scheduling Assignment) is transmitted in V2X and a data channel (PSSCH) through which data related thereto is transmitted is described. Here, the resource pool may be a set of resource candidates available for transmission of SA and/or data. Each resource pool may be called a slot pool in the time domain and a resource block pool in the frequency domain. Here, a resource pool such as the examples of FIGS. 7 and 8 may be a resource pool for V (Vehicle)-UE in V2X. In addition, the resource pool setting methods such as the examples of FIGS. 7 and 8 are only examples, and the resource pool may be set up in other ways.

Resource pools such as the examples in FIGS. 7 and 8 can be defined in terminal autonomous resource selection mode (or mode 2).

Meanwhile, in the base station resource scheduling mode (or mode 1), resources corresponding to all sidelink slots in the time domain (corresponding to, for example, all uplink slots in NR) and all resource blocks (RBs) within a V2X carrier or band in the frequency domain may be sets of resource candidates available for transmission of SA and/or data. In addition, even in the base station resource scheduling mode (or mode 1), a resource pool may be separately defined to set a set of resource candidates available for transmission of the SA and/or data, as in the terminal autonomous resource selection mode (or mode 2).

That is, the resource pool according to the present disclosure described with reference to FIGS. 7 and 8 can be defined in the terminal autonomous resource selection mode (or mode 2) and/or the base station resource scheduling mode (or mode 1).

Below, we specifically describe the slot pool, which corresponds to a resource pool in the time domain.

For the above resource pool, slots for which the resource pool is set in the time domain are illustrated in FIG. 7. As shown in FIG. 7, slots for the resource pool for V2X can be defined by indicating a bitmap that is repeated for all slots except for specific slots. Slots for the resource pool for V2X can be slots in which transmission and/or reception of SA and/or data for the resource pool in V2X are allowed.

Here, the slots excluded from the bitmap repetition application may include slots used for transmission of sidelink SSB (Sidelink Signal Block) including PSSS (Primary Sidelink Synchronization Signal), SSSS (Secondary Sidelink Synchronization Signal), and PSBCH (Physical Sidelink Broadcast Channel). In addition, the excluded slots may further include downlink (DL) slots or flexible slots other than uplink (UL) slots that can be used as sidelink (SL) slots in TDD. Here, the excluded slots are not limited to the examples described above.

For example, the slots excluded within the SFN (System Frame Number) or DFN (D2D Frame Number) cycle may include d non-reciprocal link slots and slots for SSB. In addition, the slots excluded may include slots having a length within the SFN or DFN cycle. In order for the bitmap of the d' to be applied repeatedly in integer multiples, additionally d' slots may be included to be excluded. Here, the excluded slots are not limited to the examples described above.

In addition, the bitmap applied repeatedly can be indicated by a higher layer signaling such as RRC (the "slot indication of resource pool" signaling field shown in FIG. 7). If the bitmap value is 1, it indicates a slot for a resource pool, and if it is 0, it indicates a slot that does not belong to a resource pool. Here, the u value of FIG. 7 is a value according to SCS (Subcarrier Spacing) and can follow the values defined in Tables 5 to 7.

Next, we specifically describe the resource block pool corresponding to the resource pool in the frequency domain.

For the above resource pool, slots in which the resource pool is set on the frequency domain are illustrated in FIG. 8. As shown in FIG. 8, a PSCCH transmitting an SA and a PSSCH transmitting data within a resource pool can be transmitted simultaneously within one sub-channel, and while a PSSCH can be transmitted across the entire sub-channel, a PSCCH can be transmitted in a part of a sub-channel.

As illustrated in Fig. 8, in a slot where a resource pool is set in the time domain for V2X, all RBs in the frequency domain (RB#0 to RB#( )) can be defined as one RB unit, "Starting RB of sub-channels" (where, is the total number of RBs corresponding to the system bandwidth for uplink (UL), and since V2X for sidelink is defined in the UL band, UL is replaced by SL (i.e., Instead ) may be applied). The "Starting RB of sub-channels" signaling field may be indicated by higher layer signaling such as RRC. From the RB indicated by the "Starting RB of sub-channels", consecutive RBs corresponding to a total of K sub-channels belong to the resource pool. Here, the number of RBs forming one sub-channel may be indicated by the "Sub-channel size" signaling field, and the number of the K sub-channels may be indicated by the "Number of sub-channels" signaling field, through higher layer signaling such as RRC.

For example, "Sub-channel size" The number of RBs can be 10, 15, 20, 25, 50, 75 or 100, but is not limited thereto, and 4, 5 or 6 RBs can also be used. In addition, as shown in Fig. 8, a PSCCH for an SA allocated to a part of a sub-channel can be allocated to X RBs within the sub-channel, where X≤ am.

The positioning technology applied below is being further improved by using NR (New Radio) wireless technology based on LTE (Long Term Evolution). For commercial use, it includes technologies to satisfy an error of up to 3m indoors and an error of up to 10m outdoors for 80% of users within the coverage. For this purpose, various technologies are being considered, such as a technology based on arrival time (time) for downlink and/or uplink and a technology based on departure/arrival angle (angle).

As a downlink-based method, there is a DL-TDOA (Time Difference of Arrival) method as a time-based technology, and a DL-AoD (Angle of Departure) method as an angle-based technology. For example, in the case of estimating the position of a terminal based on DL-TDOA, the arrival time difference of signals transmitted from different transmission points is calculated, and the position of the terminal can be estimated through the arrival time difference value and the position information of each transmission point. In addition, as an example, in the case of estimating the position of a terminal based on DL-AoD, the launch angle (Angle of Departure) of the signal transmitted to the terminal can be confirmed, and the direction in which the signal is transmitted can be confirmed based on the position of the transmission point, so that the position of the terminal can be estimated.

In addition, as an uplink-based method, there is a UL-TDOA (Time Difference of Arrival) method as a time-based technology, and a DL-AoA (Angle of Arrival) method as an angle-based technology. For example, in the case of estimating the position of a terminal based on UL-TDOA, the time difference in which a signal transmitted from the terminal arrives at each transmission point is calculated, and the position of the terminal can be estimated through the arrival time difference value and the position information of each transmission point. In addition, as an example, in the case of estimating the position of the terminal based on DL-AoA, the angle of arrival of the signal transmitted from the terminal can be confirmed, and the direction in which the signal is transmitted can be confirmed based on the position of the transmission point, so that the position of the terminal can be estimated.

In addition, as downlink and uplink based methods, there are multi-cell RTT (Round-Trip Time) method, RTT method between one or more adjacent gNodeBs and/or Transmission Reception Points (TRPs) for NR downlink and uplink positioning, and E-CID (Enhanced Cell ID) method, etc. For example, in case of estimating the position of a terminal by multi-cell RTT, the time (i.e., RTT) from when a signal is transmitted from a plurality of cells to when a response is received can be measured, so that the position of the terminal can be estimated through the position information of the plurality of cells. In addition, the position of the terminal can be estimated by confirming the RTT signal in the gNodeBs and/or TRPs. In addition, in case of estimating the position of the terminal based on E-CID, the angle of arrival and reception intensity can be measured, each cell ID can be confirmed, and the position of the terminal can be estimated through the cell position information.

In order to realize the above-mentioned technologies, the PRS (Positioning Reference Signal) based on LTE downlink is being newly discussed as a "DL PRS" that is changed according to the NR downlink structure. Additionally, for uplink, the SRS (Sounding Reference Signal), which is an NR-based uplink reference signal that considers MIMO, etc., is being developed into an improved reference signal, "SRS for positioning," that takes positioning into account.

Additionally, in order to provide an improved solution with respect to positioning operations, we are considering additional requirements for high accuracy for horizontal and vertical position measurements, low latency, network efficiency (e.g., scalability, RS overhead, etc.), and terminal efficiency (e.g., power consumption, complexity, etc.).

For example, positioning operations may be required to have high accuracy considering IIoT scenarios. For this purpose, downlink/uplink (DL/UL) position reference signals, signaling/procedures for improved accuracy, reduced delay, and methods for improving network efficiency and terminal efficiency may be considered.

Accordingly, work is being done to improve the performance of NR-based positioning technologies for higher accuracy, lower latency, and network/terminal efficiency in commercial use cases such as IoT devices for smart homes or wearables, and IIoT (Industrial IoT (Inter of Things)) use cases such as IoT devices in smart factories.

In this regard, the goal is to further improve accuracy with an error of up to 1 m for commercial use cases and up to 0.2 m for IIoT use cases, while reducing delay time from the existing 100 ms to 10 ms.

Here, the IIoT scenario considering devices for indoor smart factories (indoor factory devices) can be as shown in Table 9 below. In addition, as an example, Table 10 below can represent settings for simulation considering the IIoT scenario. Specifically, in Table 10, considering IIoT scenarios such as smart factories, the hall size, BS locations, and room height can be set, and the transmission and reception operations of the BS can be confirmed based on this. However, this is only one example and may not be limited to the above-described settings.

Specifically, the IIoT scenario can consider cases where the internal environment has dense clusters (clutter) and cases where the clusters are not dense (sparse). That is, it can be distinguished based on how many clusters exist in the internal environment. In addition, the IIoT scenario can consider cases where the antenna height is higher or lower than the average height of the cluster. That is, the IIoT scenario can be as shown in Table 9 below by considering the cases described above.

That is, InF-SL is a scenario that considers a case in which clusters are not densely packed in an indoor factory environment such as a smart factory and both the transmit and receive antennas of the base station are lower than the average antenna height of the cluster. InF-DL is a scenario that considers a case in which clusters are densely packed in an indoor factory environment such as a smart factory and both the transmit and receive antennas of the base station are lower than the average antenna height of the cluster.

Meanwhile, InF-SH is a scenario that considers a case where clusters are not densely packed in an indoor factory environment such as a smart factory and the base station's transmission or reception antenna is higher than the average antenna height of the cluster. InF-DH is a scenario that considers a case where clusters are densely packed in an indoor factory environment such as a smart factory and the base station's transmission or reception antenna is higher than the average antenna height of the cluster.

Additionally, InF-HH is a scenario that considers a case in which both the transmit and receive antennas of the base station are higher than the average antenna height of the cluster, regardless of the density of the cluster in an indoor factory environment such as a smart factory.

Here, a cluster (clutter, cluster) means a form in which base stations are densely arranged at regular intervals in a certain space. For example, a cluster can be implemented with 18 base stations in an internal environment as in Table 10, but this is only one example and is not limited thereto.

In addition, as mentioned above, the density of clusters and the antenna height between the base station and the cluster were considered in the scenario because the characteristics of radio waves and interference may differ accordingly, and thus the positioning technology to satisfy various performance requirements (accuracy, delay time, network/terminal efficiency, etc.) required for positioning may slightly differ.

However, in actual applications, a common positioning technology that can cover all requirements of the above five scenarios can be applied, and the positioning technology mentioned in the present invention below can also be applied to all of the above five scenarios. In other words, positioning is possible by applying the positioning technology mentioned in the present invention below to all IIoT devices operating based on NR in an indoor factory environment such as a smart factory.

[Table 9]

[Table 10]

Below we describe how to create a PRS considering the positioning requirements required for the IIoT scenarios described above and new applications.

FIG. 9 is a diagram illustrating a method for performing position measurement based on OTDOA (Observed Time Difference Of Arrival) to which the present disclosure can be applied.

OTDOA may be a method of measuring a location by tracking a signal transmitted to a ground station via a communication satellite in an LTE and/or NR system. That is, OTDOA is based on measuring the difference in arrival times of wireless signals transmitted from various locations. For example, a plurality of cells may transmit a reference signal (RS), and a terminal may receive the same. Since the distances between each of the plurality of cells and the location of the terminal are different, the arrival times of the reference signals transmitted from each of the plurality of cells at the terminal may be different from each other. Here, the terminal may calculate the time difference for the signal received from each cell, and transmit the calculated information to the network. The network may combine the time difference with the antenna location information of each cell to calculate the location of the terminal. Here, at least three cells may be used to measure the location of the terminal.

Also, as an example, the difference in time at which a terminal receives a reference signal from each of a pair of base stations (gNodeBs/eNodeBs) is defined as the Reference Signal Time Difference (RSTD). Here, position measurement by RSTD can be performed based on a downlink signal. The terminal can estimate a position based on a TDOA (Time Difference Of Arrival) measurement of a specific reference signal received from other base stations (gNodeBs/eNodeBs).

FIG. 10 illustrates a control plane and user plane configuration diagram for NRPP (NR positioning protocol) related to the present invention to which the present disclosure can be applied. For example, the positioning technology can be defined as at least one of E-CID (Enhanced Cell ID), OTDOA (Observed Time Difference of Arrival), and A-GNSS (Global Navigation Satellite System). At this time, the above-described positioning technology can support positioning solutions of the control plane and the user plane at the same time. The LTE and/or NR network-based positioning function can be controlled by the LMF (Location Management Function). Here, the control plane positioning and the user plane positioning can be performed through the LMF. The LMF can be controlled at the network level and can be linked through a base station and a mobility entity (e.g., AMF (Access and Mobility Management Function)). For example, the LMF can correspond to a location server described later in the present patent.

As another example, the LTE and/or NR network-based positioning function may be controlled by an Evolved-Serving Mobile Location Center (E-SMLC)/Secure User Plane Location (SLP) Location Platform (SLP) based on the LTE positioning protocol (LPP). Here, positioning may be performed in the control plane via the E-SMLC, and positioning may be performed in the user plane via the SLP, each of which may be controlled at the network level and interoperable with a base station and a mobility entity (e.g., a Mobility Management Entity (MME)).

For example, in an LTE system, positioning is performed through position estimation based on downlink based on time difference, or positioning is performed through position estimation based on cell ID. In an NR system, positioning can perform a positioning operation by considering position estimation based on downlink (e.g., PRS) and position estimation based on uplink (e.g., SRS for positioning). In addition, the positioning can perform a positioning operation based on signal exchange time for multiple cells as a round trip time (RTT), or positioning operation can be performed based on cell ID. In addition, the positioning can perform a positioning operation based on a signal reception time difference. In addition, since a new communication system performs communication based on beams, a positioning operation can be performed based on an angular difference for each beam. Downlink/uplink reference signals and terminal/base station operations based on the above can be as shown in Table 11 and Table 12 below.

[Table 11]

[Table 12]

Here, the terms in Table 11 and Table 12 may be as follows.

- RSTD (Reference Signal Time Difference)

- RSRP (Reference Signal Received Power)

- RTOA (Relative Time Of Arrival)

- RSRQ (Reference Signal Received Quality)

- RSRPB (Reference Signal Received Power per Branch)

- RRM (Radio Resource Management)

- CSI-RS (Channel State Information Reference Signal)

Here, RSTD can be a transmission time difference of a reference signal, and RTOA can be a relative time value at which a signal arrives. Positioning can be performed based on the location information of the transmission point by calculating a relative time difference value based on the location and transmission time difference of the transmission point that transmitted the reference signal. In addition, RSRP is the strength of the received reference signal, and RSRPB is the strength of the reference signal measured at each branch. RSRQ is the quality of the received reference signal. It can be confirmed whether the positioning operation is possible by checking the strength and quality of the reference signal received through RSRP and RSRQ. In addition, RRM can perform resource management and confirm the resources for positioning.

FIG. 11 is a diagram illustrating a method for performing sidelink-based positioning applicable to the present disclosure.

Referring to FIG. 11, sidelink-based positioning can be performed. As a specific example, in FIG. 11, terminal A (1120), terminal B (1130), and terminal C (1140) can exist within the coverage of base station (1110). As an example, terminal A (1120), terminal B (1130), and terminal C (1140) can each be in an RRC-connected state with base station (1110), but are not limited thereto. At this time, the location of terminal D (1150) can be measured based on sidelink-based positioning.

Here, as an example, sidelink communication may be possible between terminal A (1120) and terminal D (1150), sidelink communication may be possible between terminal B (1130) and terminal D (1150), and sidelink communication may be possible between terminal C (1140) and terminal D (1150). As another example, terminal A (1120), terminal B (1130), terminal C (1140), and terminal D (1150) may perform sidelink communication based on group communication based on groupcast. As an example, terminal A (1120) may be a master terminal in group communication, but is not limited to the above-described embodiment.

Also, as an example, the following is described based on the above-described situation for the convenience of explanation, but may not be limited thereto. Referring to FIG. 11, the base station (1110) may transmit allocation information A to terminal A (1120), allocation information B to terminal B (1130), and allocation information C to terminal C (1140). At this time, the allocation information A may be information required for terminal A (1120) to transmit sidelink positioning reference signal (SL PRS) A. As an example, the allocation information A may include at least one of resource and sequence information required for terminal A (1120) to transmit SL PRS A, but may further include other information. In addition, the allocation information B may be information required for terminal B (1130) to transmit SL PRS B. Allocation information B may include at least one of the resource and sequence information required for terminal B (1130) to transmit SL PRS B, but may further include other information. In addition, allocation information C may be information required for terminal C (1140) to transmit SL PRS C. Allocation information C may include at least one of the resource and sequence information required for terminal C (1140) to transmit SL PRS C, but may further include other information.

At this time, as an example, each of allocation information A, allocation information B, and allocation information C may be transmitted from the base station (1110) to each of terminal A (1120), terminal B (1130), and terminal C (1140) by upper layer signaling (e.g. RRC). Here, as an example, each of allocation information A, allocation information B, and allocation information C may be allocated by a location server, and the allocated information may be transmitted to each of the terminals via the base station (1110), but is not limited to a specific embodiment.

Thereafter, terminal A (1120) can transmit allocation information A' to terminal D (1150). Here, allocation information A' may be information required for terminal A (1120) to transmit SL PRS A to terminal D (1150). For example, allocation information A' may be the same information as allocation information A. That is, terminal A (1120) may forward allocation information received from base station (1110) to terminal D (1150). As another example, allocation information A' may be information generated based on allocation information A received by terminal A (1120). At this time, for example, terminal A (1120) may transmit allocation information A' to terminal D (1150) through at least one of a physical sidelink control channel (PSCCH) and a physical sidelink shared channel (PSSCH).

In addition, terminal B (1130) can transmit allocation information B' to terminal D (1150). Here, allocation information B' may be information required for terminal B (1130) to transmit SL PRS B to terminal D (1150). For example, allocation information B' may be the same information as allocation information B. That is, terminal B (1130) may forward allocation information received from base station (1110) to terminal D (1150). As another example, allocation information B' may be information generated based on allocation information B received by terminal B (1130). In this case, for example, terminal B (1130) may transmit allocation information B' to terminal D (1150) through at least one of PSCCH and PSSCH.

In addition, terminal C (1140) can transmit allocation information C' to terminal D (1150). Here, the allocation information C' may be information required for terminal C (1140) to transmit SL PRS C to terminal D (1150). For example, the allocation information C' may be the same information as the allocation information C. That is, terminal C (1140) may forward the allocation information received from the base station (1110) to terminal D (1150). As another example, the allocation information C' may be information generated based on the allocation information C received by terminal C (1140). That is, each terminal may transmit its respective allocation information to terminal D (1150). At this time, as an example, terminal B (1130) may transmit the allocation information B' to terminal D (1150) through at least one of the PSCCH and the PSSCH.

After that, terminal A (1120) can transmit SL PRS A to terminal D (1150). In addition, terminal B (1130) can also transmit SL PRS B to terminal D (1150). In addition, terminal C (1140) can also transmit SL PRS C to terminal D (1150). That is, each of the terminals can transmit its respective SL PRS to terminal D (1150) based on the allocated resource information.

Thereafter, terminal D (1150) can perform measurement based on each of SL PRS A, SL PRS B and SL PRS C received from each of terminal A (1120), terminal B (1130) and terminal C (1140). Terminal D (1150) can transmit measurement information to terminal A (1120). At this time, the measurement information can be a measurement value measured based on at least one of OTDOA (observed time difference of arrival) and RSTD (reference signal time difference) according to each of SL PRS A, SL PRS B and SL PRS C. For example, the measurement values can be values A, B and C for terminal A (1120), terminal B (1130) and terminal C (1140), respectively. Here, if terminal D (1150) knows the locations of terminal A (1120), terminal B (1130), and terminal C (1140) in advance, terminal D (1150) can derive the location value of terminal D (1150) through the above-described measurement values A, B, and C, and the derived location value can be included in the measurement information. On the other hand, if terminal D (1150) does not know the locations of terminal A (1120), terminal B (1130), and terminal C (1140) in advance, the above-described measurement values A, B, and C can each be included in the measurement information, and the corresponding information can be transmitted to terminal A (1120). Thereafter, terminal A (1120) can transmit the measurement information acquired from terminal D (1150) to the base station (1110), and the measurement information transmitted at this time may be one of: i) if measurement values A, B, and C are transmitted from terminal D (1250), transmitting the received measurement values A, B, and C as they are, ii) if measurement values A, B, and C are transmitted from terminal D (1250), transmitting the location values of terminal D (1250) derived from the received measurement values A, B, and C, or iii) if the location values of terminal D (1250) are transmitted from terminal D (1250), transmitting them as they are. In addition, as an example, the base station (1110) may further transmit the measurement information to a location server, but may not be limited thereto. Positioning can be performed through the above-described method.

FIG. 12 is a diagram illustrating a method for performing sidelink-based positioning applicable to the present disclosure.

Referring to FIG. 12, sidelink-based positioning can be performed. As a specific example, in FIG. 12, terminal A (1220), terminal B (1230), and terminal C (1240) can exist within the coverage of base station (1210). As an example, terminal A (1220), terminal B (1230), and terminal C (1240) can each be in an RRC-connected state with base station (1210), but may not be limited thereto. At this time, the location of terminal D (1250) can be measured based on sidelink-based positioning.

Here, as an example, sidelink communication may be possible between terminal A (1220) and terminal D (1250). As another example, terminal A (1220) may perform sidelink communication based on group communication based on groupcast. As an example, terminal A (1220) may be a master terminal in group communication, but is not limited to the above-described embodiment.

Also, as an example, the following is described based on the above-described situation for the convenience of explanation, but may not be limited thereto. Referring to FIG. 12, the base station (1210) can transmit allocation information A to each terminal A (1220). At this time, terminal A (1220) can perform sidelink communication with terminal D (1250), and there is a need to transmit allocation information for terminal B (1230) and terminal C (1240) to terminal D (1250). Accordingly, the base station (1210) can transmit allocation information B and allocation information C, which are allocation information for terminal B (1230) and terminal C (1240), to terminal A (1220) together with allocation information A. That is, terminal A (1220) can obtain allocation information A, allocation information B, and allocation information C from the base station (1210).

Thereafter, the base station (1210) can transmit allocation information B to terminal B (1230) and can transmit allocation information C to terminal C (1240). At this time, allocation information A may be information required for terminal A (1220) to transmit SL PRS A. For example, allocation information A may include at least one of resource and sequence information required for terminal A (1220) to transmit SL PRS A, but may further include other information. In addition, allocation information B may be information required for terminal B (1230) to transmit SL PRS B. Allocation information B may include at least one of resource and sequence information required for terminal B (1230) to transmit SL PRS B, but may further include other information. In addition, allocation information C may be information required for terminal C (1240) to transmit SL PRS C. Allocation information C may include at least one of the resource and sequence information required for terminal C (1240) to transmit SL PRS C, but may also include other information.

At this time, as an example, allocation information A, allocation information B, and allocation information C may be transmitted from the base station (1210) to each of terminal A (1220), terminal B (1230), and terminal C (1240) by upper layer signaling (e.g. RRC). In addition, terminal A (1220) may obtain allocation information B and allocation information C together with allocation information A through upper layer signaling (e.g. RRC), as described above. In addition, as an example, allocation information B and allocation information C transmitted together with allocation information A may be transmitted based on allocation information A+B+C. In this case, allocation information A+B+C may be information generated based on allocation information A, allocation information B, and allocation information C, and this will be described later.

In addition, as an example, each of allocation information A, allocation information B, and allocation information C may be allocated by a location server, and the allocated information may be transmitted to each terminal through the base station (1210), and may not be limited to a specific embodiment.

After that, terminal A (1220) can transmit allocation information A' to terminal D (1250). In addition, terminal A (1220) can transmit allocation information B' and allocation information C' together with allocation information A' to terminal D (1250). That is, terminal A (1220) can transmit allocation information A'+B'+C' to terminal D (1250). At this time, allocation information A'+B'+C' may be information generated based on allocation information A', allocation information B' and allocation information C', and this will be described later. At this time, terminal A (1220) can transmit allocation information A'+B'+C' to terminal D (1250) through at least one of PSCCH and PSSCH.

Here, allocation information A' may be information required for terminal A (1220) to transmit SL PRS A to terminal D (1250). For example, allocation information A' may be the same information as allocation information A. As another example, allocation information A' may be information generated based on allocation information A received by terminal A (1220).

In addition, the allocation information B' may be information required for terminal B (1230) to transmit SL PRS B to terminal D (1250). For example, the allocation information B' of terminal B (1230) may be transmitted to terminal D (1250) by terminal A (1220). That is, terminal B (1230) only transmits SL PRS B based on the allocation information received from the base station (1210), and the allocation information of terminal B (1230) may be transmitted to terminal D (1250) by terminal A (1220).

In addition, the allocation information C' of terminal C (1240) can be transmitted to terminal D (1250) by terminal A (1220). That is, terminal C (1240) only performs SL PRS C transmission based on the allocation information received from the base station (1210), and the allocation information of terminal C (1240) can be transmitted to terminal D (1250) by terminal A (1220).

After that, terminal A (1220) can transmit SL PRS A to terminal D (1250). In addition, terminal B (1230) can also transmit SL PRS B to terminal D (1250). In addition, terminal C (1240) can also transmit SL PRS C to terminal D (1250). That is, each of the terminals can transmit its respective SL PRS to terminal D (1250) based on the allocated resource information.

Thereafter, terminal D (1250) can perform measurement based on each of SL PRS A, SL PRS B and SL PRS C received from each of terminal A (1220), terminal B (1230) and terminal C (1240). At this time, terminal D (1250) can transmit measurement information to terminal A (1220). At this time, the measurement information can be a measurement value measured based on at least one of OTDOA and RSTD according to each of SL PRS A, SL PRS B and SL PRS C. For example, the measurement values can be values A, B and C for terminal A (1220), terminal B (1230) and terminal C (1240), respectively. Here, if terminal D (1250) knows the locations of terminal A (1220), terminal B (1230), and terminal C (1240) in advance, terminal D (1250) can derive the location value of terminal D (1250) through the above-described measurement values A, B, and C, and the derived location value can be included in the measurement information. On the other hand, if terminal D (1250) does not know the locations of terminal A (1220), terminal B (1230), and terminal C (1240) in advance, the above-described measurement values A, B, and C can each be included in the measurement information, and may not be limited to a specific form. Thereafter, terminal A (1220) can transmit the measurement information acquired from terminal D (1250) to the base station (1210), and the measurement information transmitted at this time may be one of: i) if measurement values A, B, and C are received from terminal D (1250), transmitting the received measurement values A, B, and C as they are, ii) if measurement values A, B, and C are received from terminal D (1250), transmitting the location values of terminal D (1250) derived from the received measurement values A, B, and C, or iii) if the location values of terminal D (1250) are received from terminal D (1250), transmitting them as they are. In addition, as an example, the base station (1210) may further transmit the measurement information to a location server, but may not be limited thereto. Positioning can be performed through the above-described method.

FIG. 13 is a diagram illustrating a method for performing sidelink-based positioning applicable to the present disclosure.

Referring to FIG. 13, sidelink-based positioning can be performed. As a specific example, terminal A (1320) can exist within the coverage of base station (1310) in FIG. 13. As an example, terminal A (1320) can be in an RRC-connected state with base station (1310), but is not limited thereto. At this time, the location of terminal D (1350) can be measured based on sidelink-based positioning. Here, as an example, sidelink communication is possible between terminal A (1320) and terminal B (1330), sidelink communication is possible between terminal A (1320) and terminal C (1340), sidelink communication is possible between terminal A (1320) and terminal D (1350), sidelink communication is possible between terminal B (1330) and terminal D (1350), and sidelink communication is possible between terminal C (1340) and terminal D (1350). As another example, terminal A (1320) can perform group communication-based sidelink communication based on groupcast. As an example, terminal A (1320) can be a master terminal in group communication, but is not limited to the above-described embodiment.

Also, as an example, the following is described based on the above-described situation for the convenience of explanation, but may not be limited thereto. Referring to FIG. 13, the base station (1310) can transmit allocation information A, allocation information B, and allocation information C to terminal A (1320). That is, the base station (1310) can transmit the above-described information to terminal A (1320) as allocation information A+B+C. As an example, allocation information A+B+C may be information generated based on allocation information A, allocation information B, and allocation information C, and this will be described later.

At this time, allocation information A may be information required for terminal A (1320) to transmit SL PRS A. For example, allocation information A may include at least one of resource and sequence information required for terminal A (1320) to transmit SL PRS A, but may further include other information. In addition, allocation information B may be information required for terminal B (1330) to transmit SL PRS B. Allocation information B may include at least one of resource and sequence information required for terminal B (1330) to transmit SL PRS B, but may further include other information. In addition, allocation information C may be information required for terminal C (1340) to transmit SL PRS C. Allocation information C may include at least one of resource and sequence information required for terminal C (1340) to transmit SL PRS C, but may further include other information.

At this time, as an example, allocation information A, allocation information B, and allocation information C may be transmitted from the base station (1310) to the terminal A (1320) by upper layer signaling (e.g. RRC). That is, the above-described allocation information A+B+C may be transmitted from the base station (1310) to the terminal A (1320) by upper layer signaling (e.g. RRC). Here, as an example, each of the allocation information A, allocation information B, and allocation information C may be allocated by a location server, and the allocated information may be transmitted to each terminal through the base station (1310), and may not be limited to a specific embodiment.

Thereafter, terminal A (1320) can generate allocation information B' and allocation information C' based on allocation information A+B+C. At this time, allocation information B' may be identical to allocation information B. As another example, allocation information B' may be generated in terminal A (1320) based on allocation information B, and is not limited to the above-described embodiment. In addition, allocation information C' may be identical to allocation information C. As another example, allocation information C' may be generated in terminal A (1320) based on allocation information C, and is not limited to the above-described embodiment.

Terminal A (1320) can transmit allocation information B' to terminal B (1330) and can transmit allocation information C' to terminal C (1340). Thereafter, terminal A (1320) can transmit allocation information A' to terminal D (1350). Here, allocation information A' may be information required for terminal A (1320) to transmit SL PRS A to terminal D (1350). For example, allocation information A' may be the same information as allocation information A. That is, terminal A (1320) may forward allocation information received from base station (1310) to terminal D (1350). As another example, allocation information A' may be information generated based on allocation information A received by terminal A (1320). Terminal A (1320) can transmit allocation information A' to terminal D (1350) through at least one of PSCCH and PSSCH.

In addition, terminal B (1330) can transmit allocation information B' to terminal D (1350). Here, allocation information B' may be information required for terminal B (1330) to transmit SL PRS B to terminal D (1350), and may be acquired from terminal A (1310). Terminal B (1330) may transmit allocation information B' to terminal D (1350) through at least one of PSCCH and PSSCH.

In addition, terminal C (1340) can transmit allocation information C' to terminal D (1350). Here, the allocation information C' may be information required for terminal C (1340) to transmit SL PRS C to terminal D (1350) and may be acquired from terminal A (1310). That is, each terminal can transmit its own allocation information to terminal D (1350). Terminal C (1340) can transmit allocation information C' to terminal D (1350) through at least one of PSCCH and PSSCH.

After that, terminal A (1320) can transmit SL PRS A to terminal D (1350). In addition, terminal B (1330) can also transmit SL PRS B to terminal D (1350). In addition, terminal C (1340) can also transmit SL PRS C to terminal D (1350). That is, each of the terminals can transmit its respective SL PRS to terminal D (1350) based on the allocated resource information.

Thereafter, terminal D (1350) can perform measurement based on each of SL PRS A, SL PRS B and SL PRS C received from each of terminal A (1320), terminal B (1330) and terminal C (1340). At this time, terminal D (1350) can transmit measurement information to terminal A (1320). At this time, the measurement information can be a measurement value measured based on at least one of OTDOA and RSTD according to each of SL PRS A, SL PRS B and SL PRS C. For example, the measurement values can be values A, B and C for terminal A (1320), terminal B (1330) and terminal C (1340), respectively. Here, if terminal D (1350) knows the locations of terminal A (1320), terminal B (1330), and terminal C (1340) in advance, terminal D (1350) can derive the location value of terminal D (1350) through the above-described measurement values A, B, and C, and the derived location value can be included in the measurement information. On the other hand, if terminal D (1350) does not know the locations of terminal A (1320), terminal B (1330), and terminal C (1340) in advance, the above-described measurement values A, B, and C can each be included in the measurement information, and may not be limited to a specific form. Thereafter, terminal A (1320) can transmit the measurement information acquired from terminal D (1350) to the base station (1310), and the measurement information transmitted at this time may be one of: i) if measurement values A, B, and C are received from terminal D (1250), transmitting the received measurement values A, B, and C as they are, ii) if measurement values A, B, and C are received from terminal D (1250), transmitting the location values of terminal D (1250) derived from the received measurement values A, B, and C, or iii) if the location values of terminal D (1250) are received from terminal D (1250), transmitting them as they are. In addition, as an example, the base station (1310) may further transmit the measurement information to a location server, but may not be limited thereto. Positioning can be performed through the above-described method.

FIG. 14 is a diagram illustrating a method for performing sidelink-based positioning applicable to the present disclosure.

Referring to FIG. 14, sidelink-based positioning can be performed. As a specific example, terminal A (1420) can exist within the coverage of base station (1410) in FIG. 14. For example, terminal A (1420) can be in an RRC-connected state with base station (1410), but is not limited thereto. At this time, the location of terminal D (1450) can be measured based on sidelink-based positioning. Here, as an example, sidelink communication can be performed between terminal A (1420) and terminal B (1430), sidelink communication can be performed between terminal A (1420) and terminal C (1440), and sidelink communication can be performed between terminal A (1420) and terminal D (1450). As another example, terminal A (1420) can perform group communication-based sidelink communication based on groupcast. For example, terminal A (1420) may be a master terminal within group communication, but is not limited to the above-described embodiment.

Also, as an example, the following is described based on the above-described situation for the convenience of explanation, but may not be limited thereto. Referring to FIG. 14, the base station (1410) can transmit allocation information A, allocation information B, and allocation information C to terminal A (1420). That is, the base station (1410) can transmit the above-described information to terminal A (1420) as allocation information A+B+C. As an example, allocation information A+B+C may be information generated based on allocation information A, allocation information B, and allocation information C, and this will be described later.

At this time, allocation information A may be information required for terminal A (1420) to transmit SL PRS A. For example, allocation information A may include at least one of resource and sequence information required for terminal A (1420) to transmit SL PRS A, but may further include other information. In addition, allocation information B may be information required for terminal B (1430) to transmit SL PRS B. Allocation information B may include at least one of resource and sequence information required for terminal B (1430) to transmit SL PRS B, but may further include other information. In addition, allocation information C may be information required for terminal C (1440) to transmit SL PRS C. Allocation information C may include at least one of resource and sequence information required for terminal C (1440) to transmit SL PRS C, but may further include other information.

At this time, as an example, allocation information A, allocation information B, and allocation information C may be transmitted from the base station (1410) to the terminal A (1420) by upper layer signaling (e.g. RRC). That is, the above-described allocation information A+B+C may be transmitted from the base station (1410) to the terminal A (1420) by upper layer signaling (e.g. RRC). Here, as an example, each of the allocation information A, allocation information B, and allocation information C may be allocated by a location server, and the allocated information may be transmitted to each terminal through the base station (1410), and may not be limited to a specific embodiment.

Thereafter, terminal A (1420) can generate allocation information B' and allocation information C' based on allocation information A+B+C. At this time, allocation information B' can be identical to allocation information B. As another example, allocation information B' can be generated in terminal A (1420) based on allocation information B, and is not limited to the above-described embodiment. In addition, allocation information C' can be identical to allocation information C. As another example, allocation information C' can be generated in terminal A (1420) based on allocation information C, and is not limited to the above-described embodiment.

Terminal A (1420) can transmit allocation information B' to terminal B (1430) and can transmit allocation information C' to terminal C (1440). In addition, allocation information A' can be identical to allocation information A. As another example, allocation information A' can be generated in terminal A (1420) based on allocation information A, and is not limited to the above-described embodiment. In addition, allocation information A+B+C can be identical to allocation information A'+B'+C'. As another example, allocation information A'+B'+C' can be generated in terminal A (1420) based on allocation information A+B+C, and is not limited to the above-described embodiment.

At this time, terminal A (1420) can transmit allocation information A'+B'+C' to terminal D (1450) via at least one of PSCCH and PSSCH. That is, unlike FIG. 13, sidelink communication exists only between terminal A (1420) and terminal D (1450), and sidelink communication does not exist between terminal B (1430) and terminal D (1450) and between terminal C (1440) and terminal D (1450), so terminal A (1420) can transmit allocation information A'+B'+C' to terminal D (1450).

After that, terminal A (1420) can transmit SL PRS A to terminal D (1450). In addition, terminal B (1430) can also transmit SL PRS B to terminal D (1450). In addition, terminal C (1440) can also transmit SL PRS C to terminal D (1450). That is, each of the terminals can transmit its respective SL PRS to terminal D (1450) based on the allocated resource information.

Thereafter, terminal D (1450) can perform measurement based on each of SL PRS A, SL PRS B and SL PRS C received from each of terminal A (1420), terminal B (1430) and terminal C (1440). At this time, terminal D (1450) can transmit measurement information to terminal A (1420). At this time, the measurement information can be a measurement value measured based on at least one of OTDOA and RSTD according to each of SL PRS A, SL PRS B and SL PRS C. For example, the measurement values can be values A, B and C for terminal A (1420), terminal B (1430) and terminal C (1440), respectively. Here, if terminal D (1450) knows the locations of terminal A (1420), terminal B (1430), and terminal C (1440) in advance, terminal D (1450) can derive the location value of terminal D (1450) through the above-described measurement values A, B, and C, and the derived location value can be included in the measurement information. On the other hand, if terminal D (1450) does not know the locations of terminal A (1420), terminal B (1430), and terminal C (1440) in advance, the above-described measurement values A, B, and C can each be included in the measurement information, and may not be limited to a specific form. Thereafter, terminal A (1420) can transmit the measurement information acquired from terminal D (1450) to the base station (1410), and the measurement information transmitted at this time may be one of: i) if measurement values A, B, and C are received from terminal D (1250), transmitting the received measurement values A, B, and C as they are, ii) if measurement values A, B, and C are received from terminal D (1250), transmitting the location values of terminal D (1250) derived from the received measurement values A, B, and C, or iii) if the location values of terminal D (1250) are received from terminal D (1250), transmitting them as they are. In addition, as an example, the base station (1410) may further transmit the measurement information to a location server, but may not be limited thereto. Positioning can be performed through the above-described method.

FIG. 15 is a diagram illustrating a method for performing sidelink-based positioning applicable to the present disclosure.

Referring to FIG. 15, sidelink-based positioning can be performed. As a specific example, positioning can be performed based on sidelink communication between terminals without base station control in FIG. 15. As an example, the location of terminal D (1540) can be measured based on sidelink-based positioning. Here, as an example, sidelink communication is possible between terminal A (1510) and terminal B (1520), sidelink communication is possible between terminal A (1510) and terminal C (1530), sidelink communication is possible between terminal A (1510) and terminal D (1540), sidelink communication is possible between terminal B (1520) and terminal D (1540), and sidelink communication is possible between terminal C (1530) and terminal D (1540). As another example, terminal A (1510) can perform group communication-based sidelink communication based on groupcast. For example, terminal A (1510) may be a master terminal within group communication, but is not limited to the above-described embodiment.

Also, as an example, the following is described based on the above-described situation for the convenience of explanation, but may not be limited thereto. Referring to FIG. 15, terminal A (1510) can generate allocation information A, allocation information B, and allocation information C. As an example, terminal A (1510) can transmit the generated allocation information B to terminal B (1520) and transmit allocation information C to terminal C (1530). In addition, terminal A (1510) can transmit allocation information A, which is allocation information for terminal A (1510), to terminal D (1540).

At this time, allocation information A may be information required for terminal A (1510) to transmit SL PRS A. For example, allocation information A may include at least one of resource and sequence information required for terminal A (1510) to transmit SL PRS A, but may further include other information. In addition, allocation information B may be information required for terminal B (1520) to transmit SL PRS B. Allocation information B may include at least one of resource and sequence information required for terminal B (1520) to transmit SL PRS B, but may further include other information. In addition, allocation information C may be information required for terminal C (1530) to transmit SL PRS C. Allocation information C may include at least one of resource and sequence information required for terminal C (1530) to transmit SL PRS C, but may further include other information.

Thereafter, terminal B (1520) can generate allocation information B' based on the allocation information B acquired from terminal A (1510) and transmit it to terminal D (1540) through at least one of the PSCCH and the PSSCH. At this time, the allocation information B' can be identical to the allocation information B. As another example, the allocation information B' can be generated in terminal B (1520) based on the allocation information B, and is not limited to the above-described embodiment.

In addition, terminal C (1530) can generate allocation information C' based on the allocation information C acquired from terminal A (1510) and transmit it to terminal D (1540) through at least one of the PSCCH and the PSSCH. At this time, the allocation information C' can be identical to the allocation information C. As another example, the allocation information C' can be generated in terminal C (1530) based on the allocation information C, and is not limited to the above-described embodiment.

After that, terminal A (1510) can transmit SL PRS A to terminal D (1540). In addition, terminal B (1520) can also transmit SL PRS B to terminal D (1540). In addition, terminal C (1530) can also transmit SL PRS C to terminal D (1540). That is, each of the terminals can transmit its respective SL PRS to terminal D (1540) based on the allocated resource information.

Thereafter, terminal D (1540) can perform measurement based on each of SL PRS A, SL PRS B and SL PRS C received from each of terminal A (1510), terminal B (1520) and terminal C (1530). At this time, terminal D (1540) can transmit measurement information to terminal A (1510). At this time, the measurement information can be a measurement value measured based on at least one of OTDOA and RSTD according to each of SL PRS A, SL PRS B and SL PRS C. For example, the measurement values can be values A, B and C for terminal A (1510), terminal B (1520) and terminal C (1530), respectively. Here, if terminal D (1540) knows the locations of terminal A (1510), terminal B (1520), and terminal C (1530) in advance, terminal D (1540) can derive the location value of terminal D (1540) through the above-described measurement values A, B, and C, and the derived location value can be included in the measurement information. On the other hand, if terminal D (1540) does not know the locations of terminal A (1510), terminal B (1520), and terminal C (1530) in advance, the above-described measurement values A, B, and C can each be included in the measurement information, and may not be limited to a specific form. Here, if terminal A (1510) receives the measurement values A, B, and C from terminal D (1540), terminal A (1510) can derive the location value of terminal D (1540) based on these measurement values.

FIG. 16 is a diagram illustrating a method for performing sidelink-based positioning applicable to the present disclosure.

Referring to FIG. 16, sidelink-based positioning can be performed. As a specific example, positioning can be performed based on sidelink communication between terminals without base station control in FIG. 16. As an example, the location of terminal D (1640) can be measured based on sidelink-based positioning. Here, as an example, sidelink communication can be possible between terminal A (1610) and terminal B (1620), sidelink communication can be possible between terminal A (1610) and terminal C (1630), and sidelink communication can be possible between terminal A (1610) and terminal D (1640). As another example, terminal A (1610) can perform group communication-based sidelink communication based on groupcast. As an example, terminal A (1610) can be a master terminal in group communication, but is not limited to the above-described embodiment.

Also, as an example, the following is described based on the above-described situation for the convenience of explanation, but may not be limited thereto. Referring to FIG. 16, terminal A (1610) can generate allocation information A, allocation information B, and allocation information C. For example, terminal A (1610) can transmit the generated allocation information B to terminal B (1620) and transmit allocation information C to terminal C (1630). In addition, terminal A (1610) can transmit allocation information A, which is allocation information for terminal A (1610), together with allocation information B and allocation information C, to terminal D (1640). That is, terminal A (1610) can transmit allocation information A+B+C to terminal D (1640). At this time, allocation information A+B+C may be information generated based on allocation information A, allocation information B, and allocation information C, which will be described later.

At this time, allocation information A may be information required for terminal A (1610) to transmit SL PRS A. For example, allocation information A may include at least one of resource and sequence information required for terminal A (1610) to transmit SL PRS A, but may further include other information. In addition, allocation information B may be information required for terminal B (1620) to transmit SL PRS B. Allocation information B may include at least one of resource and sequence information required for terminal B (1620) to transmit SL PRS B, but may further include other information. In addition, allocation information C may be information required for terminal C (1630) to transmit SL PRS C. Allocation information C may include at least one of resource and sequence information required for terminal C (1630) to transmit SL PRS C, but may further include other information.

After that, terminal A (1610) can transmit SL PRS A to terminal D (1640). In addition, terminal B (1620) can also transmit SL PRS B to terminal D (1640). In addition, terminal C (1630) can also transmit SL PRS C to terminal D (1640). That is, each of the terminals can transmit its respective SL PRS to terminal D (1640) based on the allocated resource information.

Thereafter, terminal D (1640) can perform measurement based on each of SL PRS A, SL PRS B and SL PRS C received from each of terminal A (1610), terminal B (1620) and terminal C (1630). At this time, terminal D (1640) can transmit measurement information to terminal A (1610). At this time, the measurement information can be a measurement value measured based on at least one of OTDOA and RSTD according to each of SL PRS A, SL PRS B and SL PRS C. For example, the measurement values can be values A, B and C for terminal A (1610), terminal B (1620) and terminal C (1630), respectively. Here, if terminal D (1640) knows the locations of terminal A (1610), terminal B (1620), and terminal C (1630) in advance, terminal D (1640) can derive the location value of terminal D (1640) through the above-described measurement values A, B, and C, and the derived location value can be included in the measurement information. On the other hand, if terminal D (1640) does not know the locations of terminal A (1610), terminal B (1620), and terminal C (1630) in advance, the above-described measurement values A, B, and C can each be included in the measurement information, and may not be limited to a specific form. Here, if terminal A (1610) receives the measurement values A, B, and C from terminal D (1640), terminal A (1610) can derive the location value of terminal D (1640) based on these measurement values.

Hereinafter, the side link reference signal (SL PRS) of the present invention will be described in detail.

SL PRS uses a sequence r(m) as in Equation 3. In Equation 3, the pseudo-random sequence c(i) uses the 31st Gold Sequence and can be initialized as in Equation 4.

[Mathematical Formula 3]

[Mathematical formula 4]

In mathematical expression 4, n ^u _s,f is a slot number within a radio frame, and l is an OFDM symbol number within a slot to which the sequence is mapped.

In Equation 4, n ^SL-PRS _ID,seq can be one of {0, 1, 2, ... 4095}, which is signaled from a higher layer as an SL PRS ID, or, in the absence of higher layer signaling, can be derived from a CRC value for sidelink control information mapped to a PSCCH associated with the SL PRS.

For SL PRS, the sequence r(m) is multiplied by an amplitude scaling factor β _SL-PRS and mapped to resource elements (k,l) _p,u as shown in Equation 5 below.

[Mathematical Formula 5]

In Equation 5, the resource elements (k,l) _p,u are in the resource blocks occupied by the SL PRS resources. In addition, the comb size K ^SL-PRS _comb is provided by the high layer signaling.

In mathematical expression 5, the resource element offset k ^SL-PRS _offset is one of {0, 1, 2, ..., K ^SL-PRS _comb -1}, and the frequency offset k' is given by Table 13 below.

[Table 13]

A starting symbol l ^SL-PRS _start is provided by higher layer signaling, and SL PRS is mapped to a total of L ^{SL-PRS consecutive symbols from symbol l SL-PRS} start _{. Here} , the number of symbols L _SL-PRS is provided by higher layer signaling, and must satisfy the following combination {L _SL-PRS , K ^SL-PRS _comb }.

- In the dedicated resource pool, combinations with {1, 2}, {2, 2}, {2, 4}, {4, 4}, {6, 6} and K ^SL-PRS _{comb ∈} {2, 4, 6} and L _SL-PRS ∈ {3, 4, ..., 9} (where L _SL-PRS > K ^SL-PRS _comb )

- In the shared resource pool, {1, 1}, {1, 2}, {2, 1}, {2, 2}, {2, 4}, {4, 1}, {4, 2}, {4, 4}

Fig. 17 is a drawing showing a comb pattern applicable to the present disclosure.

Referring to FIG. 17, an example of an SL PRS RE pattern in the case where the comb size and the number of symbols in Table 13 are the same is described.

More specifically, we can consider a case where the comb size is 2 (Comb-2) and is allocated to two symbols (0,1). In this case, the RE offset can be {0,1}. That is, SL PRS is allocated to the first symbol and the second symbol according to the RE offset {0,1}, and the frequency axis can be allocated based on the comb size 2. We can consider a case where the comb size is 4 (Comb-4) and is allocated to four symbols (0,1,2,3). In this case, the RE offset can be {0,2,1,3}. That is, SL PRS is allocated from the first symbol to the fourth symbol according to the RE offset {0,2,1,3}, and the frequency axis can be allocated based on the comb size 4. We can consider a case where the comb size is 6 (Comb-6) and is allocated to six symbols (0,1,2,3,4,5). At this time, the RE offset can be {0,3,1,4,2,5}. That is, from the first symbol to the sixth symbol, SL PRS is allocated according to the RE offset {0,3,1,4,2,5}, and the frequency axis can be allocated based on the comb size 6.

FIG. 18 is a diagram illustrating a PSSCH (Physical Sidelink Shared Channel) transmission method that considers transmission of SL PRS of multiple terminals applicable to the present disclosure.

As shown in Fig. 18, when a terminal uses a comb size of 2 for transmission of SL PRS and uses 0 as the frequency offset k' value according to Table 13, it cannot know whether another terminal transmits SL PRS in the resources corresponding to the frequency offset k' value 1. Therefore, it cannot determine whether PSSCH can be transmitted in the resources corresponding to the frequency offset k' value 1.

If a PSSCH is not transmitted even though another terminal does not transmit an SL PRS in the resources corresponding to the frequency offset k' value of 1, it may result in resource waste, and conversely, if a PSSCH is transmitted even though another terminal transmits an SL PRS in the resources corresponding to the frequency offset k' value of 1, it may result in serious performance degradation.

Therefore, it is necessary to instruct other terminals to transmit SL PRS on resources corresponding to the frequency offset k' value of 1.

To this end, the present invention introduces the "number of total comb patterns" C. This is the total number of comb patterns that take into account not only the comb pattern used by a specific terminal in a specific symbol but also the number of comb patterns used by other terminals when transmitting a PSSCH by a specific terminal, and is intended to not transmit the PSSCH in resources corresponding to comb patterns as many as C.

For example, in case of comb size 2, C=1 or C=2 can be. In case of C=1, the specific terminal having the frequency offset k' value of 0 uses only the resources corresponding to the frequency offset k' value of 0 for SL PRS, and the resources corresponding to the frequency offset k' value of 1 are not used by other terminals for SL PRS transmission, so that the terminal can transmit PSSCH. Conversely, the specific terminal having the frequency offset k' value of 1 uses only the resources corresponding to the frequency offset k' value of 1 for SL PRS, and the resources corresponding to the frequency offset k' value of 0 are not used by other terminals for SL PRS transmission, so that the terminal can transmit PSSCH.

In the case of comb size 2 and C=2, the specific terminal having the frequency offset k' value of 0 uses the resources corresponding to the frequency offset k' value of 0 for SL PRS, and the resources corresponding to the frequency offset k' value of 1 are used by other terminals for SL PRS transmission, so the specific terminal cannot transmit PSSCH. In addition, the specific terminal having the frequency offset k' value of 1 uses the resources corresponding to the frequency offset k' value of 1 for SL PRS, and the resources corresponding to the frequency offset k' value of 0 are used by other terminals for SL PRS transmission, so the specific terminal cannot transmit PSSCH.

For example, when the comb size is 4, C can be 1, C=2, C=3, or C=4. When C=1, the specific terminal whose frequency offset k' value is k (k=0, 1, 2 or 3) uses only the resources corresponding to the frequency offset value k for SL PRS, and the resources corresponding to the remaining frequency offset k' values are not used by other terminals for SL PRS transmission, so they can transmit PSSCH.

In the case of comb size 4 and C=2, the specific terminal having a frequency offset k' value of k (k=0, 1, 2 or 3) uses only the resources corresponding to the frequency offset value k for SL PRS, uses the resources corresponding to (k+1) mod 4 for SL PRS of other terminals, and can transmit PSSCH since the resources corresponding to (k+2) mod 4 and (k+3) mod 4 are not used by other terminals for SL PRS transmission.

In the case of comb size 4 and C=3, the specific terminal having a frequency offset k' value of k (k=0, 1, 2 or 3) uses only the resources corresponding to the frequency offset value k for SL PRS, and uses the resources corresponding to (k+1) mod 4 and (k+2) mod 4 for SL PRS of other terminals, and the resources corresponding to (k+3) mod 4 are not used by other terminals for SL PRS transmission, so that PSSCH transmission is possible.

In the case of comb size 4 and C=4, the specific terminal having the frequency offset k' value being k (k=0, 1, 2 or 3) uses only the resources corresponding to the frequency offset value k for SL PRS, and uses the resources corresponding to (k+1) mod 4, (k+2) mod 4, and (k+3) mod 4 for the SL PRS of other terminals, and therefore cannot transmit PSSCH.

This can be generalized as follows. For the cases where the comb size K ^SL-PRS _comb is 2, 4, and 6, respectively, when the "number of total comb patterns" C is signaled, a specific terminal having a frequency offset k' value of k (k=0, 1, .... K ^SL-PRS _comb -1) in a specific symbol uses only the resources corresponding to the frequency offset value k for SL PRS. In addition, the resources corresponding to the frequency offset values (k+1) mod K ^SL-PRS _comb , (k+2) mod K ^SL- PRS _comb , ...., (k+C-1) mod K ^SL-PRS _comb are used for the SL PRS of other terminal(s). The specific terminal can transmit PSSCH in the resources corresponding to the remaining frequency offset values.

Here, the "number of total comb patterns" C value can be transmitted to the specific terminal by high layer signaling or by SCI (Sidelink Control Information).

FIG. 19 is a flowchart illustrating a PSSCH (Physical Sidelink Shared Channel) transmission method for sidelink positioning to which the present disclosure is applicable.

Referring to FIG. 19, the first terminal determines the first sidelink positioning transmission resource (S1910). In addition, the first terminal determines the second sidelink positioning transmission resources to be transmitted by the second terminals (S1920). Thereafter, the first terminal transmits information about the second sidelink positioning transmission resources to the second terminals (S1930). In addition, the first terminal transmits a sidelink positioning reference signal (SL PRS) based on the first sidelink positioning transmission resource (S1940). In addition, the PSSCH is transmitted in consideration of the first sidelink positioning transmission resource and the second sidelink positioning transmission resource (S1950).

Here, the PSSCH transmission considering the first sidelink positioning transmission resources and the second sidelink positioning transmission resources is specifically examined as follows.

For each of the cases where the comb size K ^SL-PRS _comb is 2, 4 and 6, if the "number of total comb patterns" C is signaled, then a specific terminal having a frequency offset k' of a specific symbol equal to k (k=0, 1, ..., K ^SL-PRS _comb -1) uses only the resources corresponding to the frequency offset value k for SL PRS (which is transmitted based on the first sidelink positioning transmission resource). In addition, the resources corresponding to the frequency offset values (k+1) mod K ^SL-PRS _comb , (k+2) mod K ^SL-PRS _comb , ..., (k+C-1) mod K ^SL-PRS _comb) are used for the SL PRS of other terminal(s) (which are transmitted based on the second sidelink positioning transmission resource). In resources corresponding to the remaining frequency offset values, the specific terminal can perform PSSCH transmission.

Here, the "number of total comb patterns" C value can be transmitted to the specific terminal by high layer signaling or by SCI (Sidelink Control Information).

FIG. 20 is a drawing showing a base station device and a terminal device to which the present disclosure can be applied.

The base station device (2000) may include a processor (2020), an antenna unit (2012), a transceiver (2014), and a memory (2016).

The processor (2020) performs baseband-related signal processing and may include an upper layer processing unit (2030) and a physical layer processing unit (2040). The upper layer processing unit (2030) may process operations of a MAC (Medium Access Control) layer, an RRC (Radio Resource Control) layer, or a higher layer. The physical layer processing unit (2040) may process operations of a physical (PHY) layer (e.g., uplink reception signal processing, downlink transmission signal processing). In addition to performing baseband-related signal processing, the processor (2020) may also control operations of the entire base station device (2000).

The antenna unit (2012) may include one or more physical antennas, and when it includes multiple antennas, it may support MIMO (Multiple Input Multiple Output) transmission and reception. The transceiver (2014) may include a radio frequency (RF) transmitter and an RF receiver. The memory (2016) may store information processed by the processor (2020), software related to the operation of the base station device (2000), an operating system, applications, etc., and may also include components such as a buffer.

The processor (2020) of the base station (2000) may be configured to implement the operations of the base station in the embodiments described in the present invention.

The terminal device (2050) may include a processor (2070), an antenna unit (2062), a transceiver (2064), and a memory (2066). For example, the terminal device (2050) in the present invention may perform communication with a base station device (2000). As another example, the terminal device (2050) in the present invention may perform sidelink communication with another terminal device. That is, the terminal device (2050) of the present invention refers to a device that may communicate with at least one of the base station device (2000) and another terminal device, and is not limited to communication with a specific device.

The processor (2070) performs baseband-related signal processing and may include an upper layer processing unit (2080) and a physical layer processing unit (2090). The upper layer processing unit (2080) may process operations of a MAC layer, an RRC layer, or a higher layer. The physical layer processing unit (2090) may process operations of a PHY layer (e.g., downlink reception signal processing, uplink transmission signal processing). In addition to performing baseband-related signal processing, the processor (2070) may also control operations of the entire terminal device (2050).

The antenna unit (2062) may include one or more physical antennas, and when it includes multiple antennas, it may support MIMO transmission and reception. The transceiver (2064) may include an RF transmitter and an RF receiver. The memory (2066) may store information processed by the processor (2070), software related to the operation of the terminal device (2050), an operating system, applications, etc., and may include components such as a buffer. For example, the operations of FIGS. 1 to 18 described above may be performed based on the base station (2000) and the terminal device (2050), and may not be limited to a specific embodiment.

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

Additionally, various embodiments of the present disclosure may be implemented by hardware, firmware, software, or a combination thereof. In the case of hardware implementation, the present disclosure 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), general processors, controllers, microcontrollers, microprocessors, and the like.

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

2000: Base Station 2012: Base Station Antenna
2020: Processor of Base Station 2014: Transceiver of Base Station
2030: High-level processing unit of base station 2016: Memory of base station
2040: Physical layer processing unit of base station
2050: Terminal 2062: Terminal antenna
2070: Terminal processor 2064: Terminal transceiver
2080: Upper layer processing unit of the terminal 2066: Memory of the terminal
2090: Terminal physical layer processing unit

Claims (1)

A method for transmitting a PSSCH (Physical Sidelink Shared Channel) for sidelink positioning in a wireless communication system,
A step in which a first terminal determines a first sidelink positioning transmission resource;
A step in which the first terminal determines second sidelink positioning transmission resources to be transmitted by the second terminals;
A step in which the first terminal transmits information about the second sidelink positioning transmission resources to the second terminals;
A step in which the first terminal transmits a sidelink positioning reference signal based on the first sidelink positioning transmission resource; and
A method for transmitting a PSSCH, comprising the step of transmitting a PSSCH by considering the first sidelink positioning transmission resources and the second sidelink positioning transmission resources.