Method and apparatus for generating positioning reference signal in wireless communication system

Abstract

The present invention relates to a method for a terminal to estimate its location in a wireless communication system. The method for the terminal to estimate its location may include the step of receiving DL PRS configuration information from a base station, wherein the received DL PRS configuration information includes comb size and DL PRS allocation pattern information, the step of receiving a DL PRS from the base station based on the comb size and the DL PRS allocation pattern, and the step of estimating the location based on the received DL PRS.

Description

Technology Field

[0001] The present disclosure relates to a method for generating a Positioning Reference Signal (PRS) in a wireless communication system. Specifically, it relates to a method and apparatus for generating a PRS for positioning in New Radio (NR). Background Technology

[0003] Positioning can refer to the operation of estimating a location. When estimating the location of a terminal based on positioning in a wireless communication system, requirements considering use cases or scenarios must be satisfied even if there is some error in the location estimation. Here, depending on the internal environment scenario of the wireless communication system to be applied, the horizontal positioning requirement may be set to within 3m (80%), and for the external environment scenario, the horizontal positioning requirement may be set to within 10m (80%).

[0004] Meanwhile, when considering the Industrial Internet of Things (IIoT) as a new application and industrial structure, requirements for positioning error can be set high. For example, requirements for sub-meter level positioning error can be set to within 1m. Additionally, requirements for positioning error for IIoT can be set to within 0.2m.

[0005] Therefore, there is a need for a new method to generate a Positioning Reference Signal (PRS) for positioning to satisfy the requirements demanded by the development and technological changes of wireless communication systems. The problem to be solved

[0007] The technical problem of the present disclosure can provide a method and apparatus for generating a position reference signal (PRS) in a wireless communication system.

[0008] The present disclosure may provide a method and apparatus for generating a position reference signal (PRS) for positioning in consideration of an IIoT environment in a wireless communication system.

[0009] The present disclosure may provide a method and apparatus for generating a position reference signal (PRS) for positioning in a New Radio (NR) system.

[0010] The present disclosure may provide a method and apparatus for generating a Downlink PRS (DL PRS) in a wireless communication system.

[0011] The present disclosure may provide a method and apparatus for generating a Sounding Reference Signal (SRS) for positioning in a wireless communication system.

[0012] The technical problems to be solved in this disclosure are not limited to those mentioned above, and other technical problems not mentioned will be clearly understood by those skilled in the art to which this disclosure belongs from the description below. means of solving the problem

[0014] The present disclosure relates to a partial sensing method and apparatus for inter-terminal communication in a wireless communication system according to one aspect of the present disclosure.

[0015] A method for a terminal to estimate a location in a wireless communication system according to one aspect of the present disclosure comprises the step of receiving Downlink Positioning Reference Signal (DL PRS) configuration information from a base station, wherein the received DL PRS configuration information includes comb size and DL PRS allocation pattern information, the step of receiving a DL PRS from the base station based on the comb size and the DL PRS allocation pattern, and the step of estimating a location based on the received DL PRS, wherein a DL PRS resource-related ID is distinguished based on a time-axis shift value and a frequency-axis shift value based on the DL PRS allocation pattern, and the terminal can receive the DL PRS based on the DL PRS resource-related ID.

[0016] Additionally, according to one aspect of the present disclosure, the terminal receives bitmap information from the base station instructing the DL PRS muting, and performs the DL PRS muting based on the received bitmap information, wherein the bitmap information includes at least one of a first bitmap information, a second bitmap information, and a third bitmap information, wherein the first bitmap information instructs the muting for the DL PRS in units of occupations, the second bitmap information instructs the muting for the DL PRS in units of repetitions within the occupations, and the third bitmap information instructs the muting for the DL PRS in units of a plurality of symbols within the repetitions.

[0017] In addition, in a method for estimating the location of a terminal in a wireless communication system according to one aspect of the present disclosure, the method may include the step of receiving information related to the transmission of a Sounding Reference Signal (SRS) for positioning from a base station, wherein the information related to the transmission of the SRS includes at least one of comb size information and Physical Resource Block (PRB) information, the step of determining a comb size and a number of Cyclic Shifts (CS) based on the received information related to the transmission of the SRS, and the step of transmitting an SRS based on the determined comb size and the number of CS. Effects of the invention

[0019] According to the present disclosure, a method and apparatus for generating a PRS for positioning in a wireless communication system may be provided.

[0020] According to the present disclosure, a method for performing positioning with high accuracy in consideration of an Industrial Internet of Things (IIoT) scenario may be provided.

[0021] According to the present disclosure, a method for assigning downlink / uplink (DL / UL) position reference signals for positioning with high accuracy may be provided.

[0022] According to the present disclosure, a signaling / procedure for improving positioning accuracy, reduced latency, and a method for improving network efficiency and terminal efficiency may be provided.

[0023] According to the present disclosure, a method for allocating multiple PRSs to a single slot using a Downlink (DL) PRS allocation pattern with increased orthogonality can be provided to satisfy positioning requirements for low latency in the downlink. Here, the DL PRS allocation pattern can increase orthogonality in a single slot through time axis and frequency axis shifts, thereby satisfying low latency requirements for positioning.

[0024] According to the present disclosure, a PRS muting pattern can be provided as a method to reduce PRS overhead in order to prevent collisions between multiple Transmission Reception Points (TRPs) in a downlink.

[0025] According to the present disclosure, a method for determining a comb size and a Physical Resource Block (PRB) for transmitting a Sounding Reference Signal (SRS) for positioning in an uplink may be provided.

[0026] The effects obtainable from the present disclosure are not limited to those mentioned above, and other unmentioned effects will be clearly understood by those skilled in the art to which the present disclosure pertains from the description below. Brief explanation of the drawing

[0028] FIG. 1 is a drawing for illustrating an NR frame structure to which the present disclosure can be applied. FIG. 2 is a diagram showing an NR resource structure to which the present disclosure can be applied. FIG. 3 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. 4 shows a control plane and user plane configuration diagram for an LPP (LTE positioning protocol) related to the present invention to which the present disclosure can be applied. FIG. 5 is a drawing showing a comb pattern applicable to the present disclosure. FIG. 6 is a diagram illustrating a method for increasing orthogonality for DL ​​PRS resource allocation applicable to the present disclosure. FIG. 7 is a drawing showing the case where the DL PRS pattern of comb size 12 applicable to the present disclosure is a diagonal pattern. FIG. 8 is a drawing showing a DL PRS pattern of comb size 12 applicable to the present disclosure in which orthogonality is maintained after cyclic transposition. FIG. 9 is a drawing showing a DL PRS pattern of comb size 6 applicable to the present disclosure. FIG. 10 is a diagram illustrating a method for performing cyclic transposition based on a current DL PRS assignment pattern applicable to the present disclosure. FIG. 11 is a diagram illustrating a method for performing cyclic transposition based on a current DL PRS assignment pattern applicable to the present disclosure. FIG. 12 is a diagram illustrating a method for performing cyclic transposition based on a DL PRS assignment pattern that maintains orthogonality even after cyclic transposition applicable to the present disclosure. FIG. 13 is a diagram illustrating a method for performing cyclic transposition based on a DL PRS assignment pattern that maintains orthogonality even after cyclic transposition applicable to the present disclosure. FIG. 14 is a diagram illustrating a method for performing cyclic transposition based on a DL PRS assignment pattern that maintains orthogonality even after cyclic transposition applicable to the present disclosure. FIG. 15 is a diagram illustrating a DL PRS resource allocation method applicable to the present disclosure. FIG. 16 is a drawing showing additional bitmaps applicable to the present disclosure. FIG. 17 is a drawing showing an additional bitmap applicable to the present disclosure. FIG. 18 is a drawing showing additional bitmaps applicable to the present disclosure. FIG. 19 is a flowchart illustrating an example of a method for generating a PRS applicable to the present disclosure. FIG. 20 is a flowchart illustrating an example of a method for generating an SRS applicable to the present disclosure. FIG. 21 is a drawing showing a base station device and a terminal device to which the present disclosure can be applied. Specific details for implementing the invention

[0029] Hereinafter, embodiments of the present disclosure are described in detail with reference to the attached drawings so that those skilled in the art can easily implement them. However, the present disclosure may be embodied in various different forms and is not limited to the embodiments described herein.

[0030] In describing the embodiments of the present disclosure, if it is determined that a detailed description of known configurations or functions may obscure the essence of the present disclosure, such detailed description is omitted. Furthermore, parts of the drawings unrelated to the description of the present disclosure have been omitted, and similar parts are denoted by similar reference numerals.

[0031] In the present disclosure, when a component is described as being "connected," "combined," or "joined" with another component, this may include not only a direct connection but also an indirect connection in which another component exists in between. Furthermore, when a component is described as "comprising" or "having" another component, this means that, unless specifically stated otherwise, it does not exclude the other component but may include an additional component.

[0032] In the present disclosure, terms such as first, second, etc. are used solely for the purpose of distinguishing one component from another and do not limit the order or importance of the components unless specifically stated otherwise. Accordingly, within the scope of the present disclosure, a first component in one embodiment may be referred to as a second component in another embodiment, and likewise, a second component in one embodiment may be referred to as a first component in another embodiment.

[0033] In this disclosure, distinct components are intended to clearly describe their respective features and do not imply that the components are separate. That is, multiple components may be integrated to form a single hardware or software unit, or a single component may be distributed to form multiple hardware or software units. Accordingly, such integrated or distributed embodiments are included within the scope of this disclosure, unless otherwise noted.

[0034] In the present disclosure, the components described in various embodiments do not necessarily mean essential components, and some may be optional components. Accordingly, embodiments consisting of a subset of the components described in one embodiment are also included within the scope of the present disclosure. Furthermore, embodiments including additional components in addition to the components described in various embodiments are also included within the scope of the present disclosure.

[0035] The present disclosure describes a wireless communication network, and operations performed in the wireless communication network may be performed in the process of controlling the network and transmitting or receiving signals by a system (e.g., a base station) governing the wireless communication network, or in the process of transmitting or receiving signals by a terminal connected to the wireless network.

[0036] It is self-evident that various operations performed for communication with a terminal in a network consisting of multiple network nodes, including a base station, can be performed by the base station or other network nodes other than the base station. The term 'Base Station (BS)' may be replaced by terms such as fixed station, Node B, eNodeB (eNB), ng-eNB, gNodeB (gNB), and Access Point (AP). Additionally, the term 'terminal' may be replaced by terms such as User Equipment (UE), Mobile Station (MS), Mobile Subscriber Station (MSS), Subscriber Station (SS), and non-AP Station (non-AP STA).

[0037] In the present disclosure, transmitting or receiving a channel includes the meaning of transmitting or receiving information or signals through said channel. For example, transmitting a control channel means transmitting control information or signals through the control channel. Similarly, transmitting a data channel means transmitting data information or signals through the data channel.

[0038] In the following description, the term NR (New Radio) system is used for the purpose of distinguishing the system to which various examples of the present disclosure are applied from existing systems, but the scope of the present disclosure is not limited by this term.

[0039] NR systems support various subcarrier spacing (SCS) while considering diverse scenarios, service requirements, and potential system compatibility. Furthermore, NR systems can support the transmission of physical signals / channels through multiple beams to overcome poor channel environments, such as high path loss, phase noise, and frequency offset occurring at high carrier frequencies. Through this, NR systems can support applications such as enhanced mobile broadband (eMBB), massive machine type communications (mMTC) / ultra machine type communications (uMTC), and ultra reliable and low latency communications (URLC).

[0040] Hereinafter, 5G mobile communication technology can be defined to include not only NR systems but also existing LTE-A (Long Term Evolution-Advanced) systems and LTE (Long Term Evolution) systems. 5G mobile communication may include not only newly defined NR systems but also technologies that operate considering backward compatibility with previous systems. Accordingly, the 5G mobile communication described below may include technologies that operate based on NR systems and technologies that operate based on previous systems (e.g., LTE-A, LTE), and is not limited to specific systems.

[0041] The positioning field to which the present invention applies relates to positioning technology in NR systems, and may partially include positioning technology in LTE systems in consideration of backward compatibility with previous systems. For convenience of explanation, the following description describes operations and related information for positioning based on NR systems. However, the features of the embodiments of the present disclosure may not be limited to specific systems and may be equally applicable to other systems implemented similarly, and are not limited to exemplary systems to which the embodiments of the present disclosure are applied.

[0042] First, I would like to briefly explain the physical resource structure of the NR system to which the present invention is applied.

[0043] FIG. 1 is a drawing for illustrating an NR frame structure to which the present disclosure can be applied.

[0044] In NR, the basic unit of the time domain is It could be, And, It could be. Meanwhile, the basic unit of the time domain in LTE is It could be, It can be. The constant regarding the multiple relationship between the NR time base unit and the LTE time base unit is It can be defined as.

[0045] Referring to FIG. 1, the time structure of a frame for downlink / uplink (DL / UL) transmission is It can have. Here, one frame is It consists of 10 subframes corresponding to time. The number of consecutive OFDM symbols per subframe is It may be possible. In addition, each frame may be divided into two half frames of the same size, half frame 1 may consist of subframes 0-4, and half frame 2 may consist of subframes 5-9.

[0046] Referring to FIG. 1, NTA represents the timing advance (TA) between the downlink (DL) and the uplink (UL). Here, the transmission timing of the uplink transmission frame i is determined based on the downlink reception timing at the terminal and the following Equation 1.

[0047] [Mathematical Formula 1]

[0048]

[0049] Here, can be a TA offset value resulting from duplex mode differences, etc. In FDD (Frequency Division Duplex), Although it has a value of 0, in TDD (Time Division Duplex), considering the margin for DL-UL switching time, It can be defined as a fixed value. For example, in TDD (Time Division Duplex) of FR1 (Frequency Range 1), which is a frequency below 6 GHz. is 39936 or 25600 It could be. 39936 is 20.327μs, and 25600 is 13.030 μs. Also, at the millimeter wave (mmWave) frequency FR2 (Frequency Range 2), the NTA,offset is 13792 It could be. In this case, 13792 It is 7.020 μs.

[0051] FIG. 2 is a diagram showing an NR resource structure to which the present disclosure can be applied.

[0052] 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 for each subcarrier spacing. Uplink and downlink transmission and reception can be performed based on the corresponding resource grid.

[0053] In the frequency domain, a single 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 an RB can be utilized within a specific frequency band or system bandwidth. The index for an RB can be defined as shown in Equation 2 below. Here, NRBsc represents the number of subcarriers per RB, and k represents the subcarrier index.

[0054] [Mathematical Formula 2]

[0055]

[0057] Various numerals can be configured to satisfy the various services and requirements of an NR system. For example, while an LTE / LTE-A system may support one subcarrier spacing (SCS), an NR system may support multiple SCSs.

[0058] A new numerology for an NR system that supports multiple SCSs can operate in frequency ranges or carriers such as 3 GHz or lower, 3 GHz to 6 GHz, or 6 GHz to 2.6 GHz, in order to solve the problem that wide bandwidth could not be used in frequency ranges or carriers such as 700 MHz or 2 GHz.

[0059] Table 1 below shows examples of numerals supported by the NR system.

[0060] [Table 1]

[0061]

[0062] Referring to Table 1 above, the numeral can be defined based on the subcarrier spacing (SCS), cyclic prefix (CP) length, and the number of OFDM symbols per slot used in the Orthogonal Frequency Division Multiplexing (OFDM) system. These 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.

[0063] In Table 1 above, when the subcarrier spacing setting index (u) is 2, the subcarrier spacing (Δf) is 60 kHz, and normal CP and extended CP may be applied. For other numerals indexes, only normal CP may be applied.

[0064] A normal slot can be defined as the basic time unit used to transmit a single piece of 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 of 1 ms in an NR system and can be used as a reference time for the length of other time intervals. Here, for the coexistence or backward compatibility of LTE systems and NR systems, time intervals similar to LTE subframes may be required in NR specifications.

[0065] For example, in LTE, data can be transmitted based on a unit of time called a Transmission Time Interval (TTI), and the TTI can be set in units of one or more subframes. Here, one subframe can be set to 1ms and can contain 14 OFDM symbols (or 12 OFDM symbols).

[0066] Additionally, non-slots may be defined in NR. A non-slot may refer to a slot having a number of symbols smaller than that of a normal slot by at least one symbol. For example, when providing low latency, such as in URLLC services, latency can be reduced through non-slots having a number of symbols smaller than that of a normal slot. Here, the number of OFDM symbols included in the non-slot may be determined by considering the frequency range. For example, in a frequency range of 6 GHz or higher, a non-slot with a length of 1 OFDM symbol may be considered. As an additional example, the number of OFDM symbols defining the non-slot may include at least 2 OFDM symbols. Here, the range of the number of OFDM symbols included in the non-slot may be set as the length of a mini-slot up to a predetermined length (e.g., normal slot length minus 1). However, as a specification for the non-slot, the number of OFDM symbols may be limited to a range of 2, 4, or 7 symbols, but is not limited thereto.

[0067] In addition, for example, in the unlicensed band below 6 GHz, subcarrier spacing corresponding to u 1 and 2 may be used, and in the unlicensed band above 6 GHz, subcarrier spacing corresponding to u 3 and 4 may be used. For example, when u is 4, it may be used for the Synchronization Signal Block (SSB).

[0068] [Table 2]

[0069]

[0070] Table 2 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( It represents ). Table 2 shows the values ​​described above based on a normal slot with 14 OFDM symbols.

[0071] [Table 3]

[0072]

[0073] Table 3 shows the number of slots per frame and the number of slots per subframe based on a normal slot with 12 OFDM symbols per slot when extended CP is applied (i.e., when u is 2 and subcarrier spacing is 60 kHz).

[0074] As mentioned above, one subframe may correspond to 1ms on the time axis. Additionally, 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 to be considered within 10ms corresponding to one radio frame may be set differently. Table 4 may show the number of slots and symbols according to each SCS. In Table 4, an SCS of 480kHz may not be considered, but is not limited to these examples.

[0075] [Table 4]

[0076]

[0077] The positioning technology to which the present invention is applied is currently being further improved by utilizing NR (New Radio) wireless technology based on LTE (Long Term Evolution). For commercial use, it includes technologies designed to satisfy an error of up to 3m indoors and up to 10m outdoors for 80% of users within the coverage area. To this end, various technologies are being considered for the downlink and / or uplink, such as technologies based on arrival time and technologies based on departure / arrival angles.

[0078] As a downlink-based method, the DL-TDOA (Time Difference of Arrival) method is a time-based technique, and the DL-AoD (Angle of Departure) method is an angle-based technique. For example, when estimating the location of a terminal based on DL-TDOA, the difference in arrival times of signals transmitted from different transmission points is calculated, and the location of the terminal can be estimated through the arrival time difference value and the location information of each transmission point. Additionally, for example, when estimating the location of a terminal based on DL-AoD, the Angle of Departure of the signal transmitted to the terminal is checked, and the direction in which the signal is transmitted relative to the location of the transmission point is checked to estimate the location of the terminal.

[0079] In addition, as an uplink-based method, the UL-TDOA (Time Difference of Arrival) method is a time-based technique, and the DL-AoA (Angle of Arrival) method is an angle-based technique. For example, when estimating the location of a terminal based on UL-TDOA, the time difference between the arrival of a signal transmitted from the terminal at each transmission point is calculated, and the location of the terminal can be estimated through the arrival time difference value and the location information of each transmission point. Also, for example, when estimating the location of a terminal based on DL-AoA, the angle of arrival of the signal transmitted from the terminal is checked, and the direction in which the signal is transmitted is determined relative to the location of the transmission point to estimate the location of the terminal.

[0080] In addition, downlink and uplink-based methods include multi-cell RTT (Round-Trip Time) methods, RTT methods between one or more adjacent gNBs and / or TRPs (Transmission Reception Points) for NR downlink and uplink positioning, and E-CID (Enhanced Cell ID) methods. For example, when estimating the location of a terminal using multi-cell RTT, the time (i.e., RTT) for a signal to be transmitted and a response received from multiple cells can be measured, and the location of the terminal can be estimated using the location information of multiple cells. Additionally, the location of the terminal can be estimated by checking the RTT signals at gNBs and / or TRPs. Furthermore, when estimating the location of a terminal based on E-CID, the angle of arrival and reception strength can be measured to identify each cell ID, and the location of the terminal can be estimated using the cell location information.

[0081] To realize the aforementioned technologies, the LTE downlink-based Positioning Reference Signal (PRS) is being newly discussed as “DL PRS,” which is modified according to the NR downlink structure. Additionally, for the uplink, the Sounding Reference Signal (SRS), an NR-based uplink reference signal that takes MIMO into account, is evolving into “SRS for positioning,” a reference signal that is improved by taking positioning into account.

[0082] In addition, to provide an improved solution regarding positioning operations, requirements for high accuracy, low latency, network efficiency (e.g., scalability, RS overhead, etc.), and terminal efficiency (e.g., power consumption, complexity, etc.) for horizontal and vertical position measurements are additionally considered.

[0083] For example, requirements for positioning operations can be considered to ensure high accuracy in IIoT scenarios. To this end, downlink / uplink (DL / UL) location reference signals, signaling / procedures for improved accuracy, reduced latency, and measures to improve network efficiency and terminal efficiency can be considered.

[0084] Accordingly, in commercial use cases such as IoT devices for smart homes or wearables, and in IIoT (Industrial IoT (Inter of Things)) use cases such as IoT devices in smart factories, efforts are being made to improve the performance of NR-based positioning technologies to achieve higher accuracy, lower latency, and network / terminal efficiency.

[0085] In this regard, the goal is to increase accuracy to an error of up to 1 m for commercial use cases and up to 0.2 m for IIoT use cases, and to further reduce latency from the existing 100 ms to 10 ms.

[0086] Here, an IIoT scenario considering indoor factory devices, etc. for an indoor smart factory can be as shown in Table 5 below.

[0087] Specifically, IIoT scenarios can consider cases where clusters are dense and cases where clusters are sparse in the internal environment. That is, they can be distinguished based on how many clusters exist in the internal environment. Additionally, IIoT scenarios can consider cases where the antenna height is higher than the average height of the cluster and cases where it is lower. In other words, considering the cases described above, IIoT scenarios can be as shown in Table 5 below.

[0088] In other words, InF-SL is a scenario that considers cases in indoor factory environments, such as smart factories, where clusters are not dense and both the base station's transmitting and receiving antennas are lower than the average antenna height of the cluster. Additionally, InF-DL is a scenario that considers cases in indoor factory environments, such as smart factories, where clusters are dense and both the base station's transmitting and receiving antennas are lower than the average antenna height of the cluster.

[0089] Meanwhile, InF-SH is a scenario that considers cases in indoor factory environments, such as smart factories, where clusters are not dense and the base station's transmitting or receiving antenna is higher than the average antenna height of the cluster. Additionally, InF-DH is a scenario that considers cases in indoor factory environments, such as smart factories, where clusters are dense and the base station's transmitting or receiving antenna is higher than the average antenna height of the cluster.

[0090] Additionally, InF-HH is a scenario that considers the case where both the transmitting and receiving antennas of a base station are higher than the average antenna height of the cluster, regardless of cluster density, in indoor factory environments such as smart factories.

[0091] Here, a cluster refers to a configuration in which base stations are intensively arranged at regular intervals within a given space. For example, a cluster can be implemented with 18 base stations in an internal environment, but this is just one example and is not limited thereto.

[0092] In addition, as mentioned above, the cluster density and antenna height between the base station and the cluster were considered in the scenario because the characteristics of the radio waves or interference differ accordingly, and thus the positioning technology required to satisfy various performance requirements (accuracy, latency, network / terminal efficiency, etc.) required for positioning may vary slightly.

[0093] However, in actual application, a common positioning technology capable of covering all requirements in the five scenarios mentioned above can be applied, and the positioning technology to be mentioned below in this invention can also be applied to all five scenarios. That is, positioning is possible by applying the positioning technology to be mentioned below in this invention to all IIoT devices operating based on NR in indoor factory environments, such as smart factories.

[0094] [Table 5]

[0095]

[0096] The following describes a method for generating a PRS by considering the positioning requirements for the aforementioned IIoT scenarios and new applications.

[0097] FIG. 3 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.

[0098] OTDOA may be a method for determining location by tracking signals transmitted to a ground station via communication satellites in LTE and / or NR systems. In other words, OTDOA is based on measuring the difference in arrival times of radio signals transmitted from various locations. For example, multiple cells transmit a reference signal (RS), and a terminal can receive it. Since the distance between each of the multiple cells and the terminal's location varies, the arrival times of the reference signals transmitted from each of the multiple cells and received at the terminal may differ. Here, the terminal can calculate the time difference for the signals received from each cell and transmit the calculated information to the network. The network can combine the time difference with the antenna location information of each cell to calculate the terminal's location. Here, at least three cells may be used to determine the terminal's location.

[0099] Additionally, as an example, the difference in the timing 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 (hereinafter RSTD). Here, location measurement based on the RSTD can be performed based on downlink signals. The terminal can estimate its location based on the Time Difference Of Arrival (TDOA) measurement of a specific reference signal received from other base stations (gNodeBs / eNodeBs).

[0100] FIG. 4 shows a control plane and user plane configuration diagram for an LTE positioning protocol (LPP) related to the present invention to which the present disclosure can be applied. For example, the positioning technology may 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). In this case, the positioning technology described above can simultaneously support positioning solutions for the control plane and the user plane. LTE and / or NR network-based positioning functions may be managed by an E-SMLC (Evolved-Serving Mobile Location Centre) or SLP (SUPL (Secure User Plane Location) Location Platform). 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, and each may be controlled at the network level and interconnected through a base station and a mobility entity (e.g., MME (Mobility Management Entity)).

[0101] For example, in an LTE system, positioning is performed by estimating the location based on the downlink based on the time difference, or by estimating the location based on the cell ID. In an NR system, positioning operations can be performed by considering downlink-based position estimation (e.g., PRS) and uplink-based position estimation (e.g., SRS for positioning). Additionally, the positioning operations can be performed based on the signal exchange time for multiple cells as the round trip time (RTT), or by estimating the location based on the cell ID. Furthermore, the positioning operations can be performed based on the signal reception time difference. Also, since the new communication system performs communication based on beams, positioning operations can be performed based on the angle difference for each beam. The downlink / uplink reference signals and terminal / base station operations based on the above may be as shown in Tables 6 and 7 below.

[0102] [Table 6]

[0103]

[0104] [Table 7]

[0105]

[0106] Here, the terms in Tables 6 and 7 may be as follows.

[0107] - RSTD (reference signal time difference)

[0108] - RSRP (reference signal received power)

[0109] - RTOA (relative time of arrival)

[0110] - RSRQ (reference signal received quality)

[0111] - RSRPB (reference signal received power per branch)

[0112] - RRM (Radio Resource Management)

[0113] Here, RSTD may be the transmission time difference of the reference signal, and RTOA may be the relative time value at which the signal arrived. Positioning can be performed based on the location information of the transmission point by calculating a relative time difference value based on the location of the transmission point that transmitted the reference signal and the transmission time difference. Additionally, 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. By checking the strength and quality of the received reference signal through RSRP and RSRQ, it is possible to determine whether a positioning operation is possible. Furthermore, RRM can perform resource management and check the resources required for positioning.

[0114] Accordingly, in the new communication system, positioning can be performed based on at least one of downlink / uplink, time difference / angle difference, RTT, and cell ID. Here, regarding the downlink PRS (DL PRS) for the positioning, a DL PRS resource set may be established at a single base station (or transmission reception point, TRP). In this case, the DL PRS resource set may be a collection of DL PRS resources. Each DL PRS resource within the DL PRS resource set may have a respective DL PRS resource ID. For example, in the new communication system (e.g., NR), each base station (or TRP) may perform communication using multiple beams. In this case, each DL PRS resource ID may correspond to each beam transmitted by a single base station (or TRP). That is, each DL PRS resource within the DL PRS resource set may correspond to each beam.

[0115] Here, the DL PRS configuration may include a DL PRS transmission schedule. This means that a base station (or TRP) may instruct the terminal to configure the DL PRS. Thus, the terminal can identify the DL PRS based on the instructed DL PRS configuration without performing blind detection. The numerologies for the DL PRS may be the same as the numerologies for the data transmission. For example, the CP length and subcarrier spacing (SCS) for the DL PRS may be the same as the CP length and SCS for the data transmission.

[0116] Additionally, DL PRS resource sets can be transmitted through the positioning frequency layer at one or more base stations (or TRPs). In this case, since the DL PRS resource sets are transmitted through the same positioning frequency layer, the SCS, CP type, center frequency, point A, bandwidth, and start PRB (Physical Resource Block) and Comb size can be set identically. Here, point A may be a value indicating the location of Resource Block 0 (RB 0). Also, the DL PRS resource sets can be transmitted through the same frequency layer. Here, the DL PRS sequence may be a binary sequence as a Gold sequence. This may be identical to the DL PRS of the existing system. The DL PRS sequence ID may be 4096. This may be greater than the sequence (1024) for the cell ID in NR. In addition, DL PRS can be modulated based on QPSK (Quadrature Phase Shift Keying) and transmitted based on CP-OFDM (Cyclic-Prefix Orthogonal Frequency Division Multiplexing). In addition, the time axis resources for DL ​​PRS can be configured with 12 symbols within a single slot, and the comb size can be supported up to comb-12.

[0117] More specific details may be as shown in Table 8 below. That is, the interval at which PRS is allocated in the frequency axis may differ based on the comb size. In LTE systems, DL PRS can be transmitted using all symbols within a single slot. However, in the new communication system, NR systems, DL PRS can be transmitted based on different number of symbols as shown in Table 8 below.

[0118] [Table 8]

[0119]

[0120] The PRS transmission period can be set for each PRS resource set. For example, each base station (or TRP) can configure multiple DL PRS resource sets. Multiple DL PRS resource sets with different periods may exist in the same base station (or TRP), and the periods can be set in various ways.

[0121] The resources allocated for the transmission of DL PRS (hereinafter, DL PRS resources) may be repeated 1, 2, 4, 6, 8, 16, or 32 times. The interval between each repeated DL PRS resource may be set to any one of 1, 2, 4, 8, 16, and 32 slots, but is not limited to the embodiments described above.

[0122] Regarding frequency allocation for the above DL PRS resources, the unit (granularity) of the DL PRS bandwidth may be 4 PRBs. The starting PRB may be instructed to the terminal as a parameter, and the terminal may determine the starting PRB based on the instructed parameter. For example, the minimum bandwidth for the DL PRS may be 24 PRBs, and the maximum bandwidth may be 272 PRBs.

[0123] In relation to DL PRS, a Resource Element (RE) offset can be set in the frequency axis. In this case, the RE offset can be set to have a constant offset in the frequency axis based on a comb pattern relative to the first symbol of the DL PRS resource. The first symbol can be configured in the terminal. Then, the remaining symbols can be determined based on the RE offset relative to the first symbol.

[0124] FIG. 5 is a drawing showing a comb pattern applicable to the present disclosure.

[0125] Referring to Fig. 5, a DL PRS RE pattern is described as an example when the comb size and the number of symbols are the same.

[0126] More specifically, consider the case where the comb size is 2 (Comb-2) and it is assigned to two symbols (0,1). In this case, the RE offset can be {0,1}. That is, the DL PRS is assigned to the first and second symbols according to the RE offset {0,1}, and the frequency axis can be assigned based on the comb size 2. Consider the case where the comb size is 4 (Comb-4) and it is assigned to four symbols (0,1,2,3). In this case, the RE offset can be {0,2,1,3}. That is, the DL PRS is assigned from the first symbol to the fourth symbol according to the RE offset {0,2,1,3}, and the frequency axis can be assigned based on the comb size 4. Consider the case where the comb size is 6 (Comb-6) and it is assigned 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, the DL PRS is assigned according to the RE offset {0,3,1,4,2,5}, and the frequency axis can be assigned based on the comb size 6.

[0127] The present invention may support DL PRS muting. When a terminal is instructed to mute a DL PRS, the terminal may mute the corresponding DL PRS. Here, a DL PRS muting bitmap for a DL PRS resource set may be configured, and based thereon, a DL PRS to be muted may be instructed to the terminal. At this time, each bit of the DL PRS muting bitmap (hereinafter, Option 1 bitmap) may correspond to each occasion or consecutive instances within the DL PRS resource set. At this time, if a specific bit indicates muting, all DL PRS within the occasion or consecutive instances corresponding to the specific bit may be muted.

[0128] Additionally, a bitmap indicating muting (hereinafter, Option 2 bitmap) may indicate muting for each DL PRS resource within an occupancy or instance for one period. Each bit of the bitmap may correspond to an iteration index of each DL PRS resource within an occupancy or instance for one period, that is, each bit may correspond to one iteration of the DL PRS within each DL PRS period, and muting may be indicated by each bit. For example, the bitmap may be composed of any one of 2, 4, 8, 16, or 32 bits.

[0129] Regarding the above muting options, at least one of the Option 1 bitmap and the Option 2 bitmap may be configured in the terminal. For example, only the Option 1 bitmap may be configured in terminal 1. Also, for example, only the Option 2 bitmap may be configured in terminal 2. Also, for example, both the Option 1 bitmap and the Option 2 bitmap may be configured in terminal 3. In this case, if both the Option 1 bitmap and the Option 2 bitmap are configured in terminal 3, all DL PRS resources within the occupies where muting is instructed based on Option 1 are muted, and among the occupies where muting is not instructed by the Option 1 bitmap, DL PRS resources instructed to be muted by the Option 2 bitmap may be muted.

[0130] In a new communication system (e.g., NR), DL PRS can be generated and position measurement can be performed. In this case, referring to Table 8 above, there may be 12 fully orthogonal resources within a single slot. In this case, when the comb size is 2 (comb-2) and DL PRS is assigned to two symbols, there are two orthogonal resources, and six additional resources can be distinguished based on the symbol offset. Also, when the comb size is 4 (comb-4) and DL PRS is assigned to two symbols, there are four orthogonal resources, and three additional resources can be distinguished based on the symbol offset. Also, when the comb size is 6 (comb-6) and DL PRS is assigned to six symbols, there are six orthogonal resources, and two additional resources can be distinguished based on the symbol offset. In addition, when the comb size is 12 (comb-12) and DL PRS is assigned to 12 symbols, there are 12 orthogonal resources, and only one can be distinguished based on the symbol offset.

[0131] Regarding the above DL PRS, in the new communication system, up to 64 TRPs can be supported in a single frequency layer, and 64 resources can be allocated for each TRP. Taking this into account, the DL PRS ID can be 4096 (64*64).

[0132] For example, assuming the terminal operates based on an IIoT scenario in the 120 kHz band, 18 TRPs can be supported by considering the scenarios in Table 5 above. In this case, considering that 64 beams are supported per TRP, each of the 64 resources can be supported for DL ​​PRS. Accordingly, the total required resources may be 1152 (18 * 64). Here, since a fully orthogonal resource within a single slot consists of 12 symbols, considering the 1152 resources, 96 (1152 / 12 = 96) slots may be required. In this case, 96 slots may correspond to 12ms at 120 kHz.

[0133] Meanwhile, the positioning-related delay requirement can be set to 100ms. Considering such IIoT scenarios, the delay requirement can be set to 10ms, 20ms, or less than 100ms. Therefore, if slots (96) corresponding to the above 12ms are used, the delay requirement (10ms) may not be satisfied. In other words, a method for efficiently allocating DL PRS resources may be required. Accordingly, the present invention proposes a method for allocating DL PRS to fewer slots by increasing orthogonality to avoid collisions between TRPs, taking into account the requirements of the above IIoT scenarios. Furthermore, the invention proposes a PRS resource allocation method that satisfies the newly proposed requirements by utilizing a method to reduce overhead through muting.

[0134] FIGS. 6 to 8 illustrate a method for increasing orthogonality for DL ​​PRS resource allocation applicable to the present disclosure. In the communication system to which the present invention is applied, the method for increasing orthogonality in a DL PRS allocation pattern to satisfy delay requirements for positioning operations can be applied while considering IIoT scenarios and use cases.

[0135] FIG. 6 is a drawing showing a DL PRS pattern of comb size 12 applicable to the present disclosure.

[0136] Referring to Fig. 6, DL PRS can be assigned to 12 symbols when the comb size is 12. This can be referenced in Table 8. Here, the pattern in which DL PRS is assigned can be {0,6,3,9,1,7,4,10,2,8,5,11}.

[0137] Specifically, referring to FIG. 6(a), f=y may be a case where the frequency axis is cyclically shifted by y and there is no transposition along the time axis (i.e., t=0). For example, when f=0, there is no transposition along the frequency axis and no transposition along the time axis, so the DL PRS assignment pattern may be {0,6,3,9,1,7,4,10,2,8,5,11}. Also, for example, when f=1, there is a case where the frequency axis is shifted by 1 and no transposition along the time axis is performed, so the pattern may be {1,7,4,10,2,8,5,11,3,9,6,0}. Also, for example, when f=y, there is a case where the frequency axis is shifted by y and no transposition along the time axis is performed. In addition, when t=x, it may be a case where a cyclic transposition of x is performed along the time axis and no transposition is performed along the frequency axis. For example, when t=1, it is a case where it is transposed by 1 along the time axis and not transposed along the frequency axis, so the DL PRS pattern may be {6,3,9,1,7,4,10,2,8,5,11,0}. Here, for example, if the orthogonality of each resource can be maintained after a cyclic transposition is performed along the frequency axis or the time axis, the orthogonality is increased based on the cyclic transposition, so more PRS resources can be allocated.

[0138] Referring to Figure 6(a), orthogonality for each resource can be maintained when cyclic transposition is performed only along the frequency axis. That is, orthogonality can be maintained regardless of which two resources from f=0 to f=11 are selected. On the other hand, the case of t=1 can be considered as a case where cyclic transposition along the time axis is also taken into account. Here, orthogonality may not be guaranteed because the resources in the case where cyclic transposition is performed by f=6 or by f=9 conflict with the case of t=1.

[0139] Referring to Figure 6(b), the case of t=2 can be considered as a case where time-axis cyclic transposition is also taken into account. Here, the resources for the cases where cyclic transposition is performed by f=3, f=7, and f=10 conflict with the case of t=2, so orthogonality may not be guaranteed.

[0140] Referring to Figure 6 (c), the case of t=3 can be considered as a case where time-axis cyclic transposition is also taken into account. Here, the resources for the cases where cyclic transposition is performed by f=4, f=7, and f=9 conflict with the case of t=3, so orthogonality may not be guaranteed.

[0141] According to the above DL PRS assignment pattern {0,6,3,9,1,7,4,10,2,8,5,11}, when frequency axis cyclic transposition and time axis cyclic transposition are considered together, orthogonality cannot be maintained due to collisions, so it may not be possible to extend the pattern based on this.

[0142] FIG. 7 is a drawing showing the case where the DL PRS pattern of comb size 12 applicable to the present disclosure is a diagonal pattern.

[0143] Referring to Fig. 7, DL PRS can be assigned to 12 symbols when the comb size is 12. Here, the pattern in which DL PRS is assigned can be {11, 10, 9, 8, 7, 6, 5, 4, 3, 2, 1, 0}. Here, f=y is the case where there is a cyclic shift of y along the frequency axis and no shift along the time axis (i.e., t=0). For example, when f=0, there is no shift along the frequency axis and no shift along the time axis, so the DL PRS assignment pattern can be {11, 10, 9, 8, 7, 6, 5, 4, 3, 2, 1, 0}. Also, for example, when f=1, it is a case where it is transposed by 1 along the frequency axis and not transposed along the time axis, so the pattern can be {0,11,10,9,8,7,6,5,4,3,2,1}. Also, for example, when f=y, it is a case where it is transposed by y along the frequency axis and not transposed along the time axis. Also, when t=x, it is a case where it is cyclically transposed by x along the time axis and not transposed along the frequency axis. Here, a diagonal pattern can be formed based on the cyclic transposition along the frequency axis. Also, for example, when t=1, it is transposed by 1 along the time axis and not transposed along the frequency axis, so the DL PRS pattern can be {10,9,8,7,6,5,4,3,2,1,0,11}. Here, if the orthogonality of each resource can be maintained after a cyclic transposition is performed along the frequency axis or the time axis, orthogonality can be increased based on the cyclic transposition.

[0144] Referring to Fig. 7(a), orthogonality for each resource can be maintained when cyclic transposition is performed only along the frequency axis. That is, orthogonality can be maintained regardless of which two resources from f=0 to f=11 are selected. On the other hand, the case of t=1 can be considered when cyclic transposition along the time axis is also taken into account. Here, since all resources in the case where cyclic transposition is performed by f=11 may conflict with the case of t=1, orthogonality may not be guaranteed.

[0145] Referring to Fig. 7(b), the case of t=2 can be considered as a case where the time axis cyclic transposition is also taken into account. Here, all resources when the cyclic transposition is performed by f=10 may conflict with the case of t=1. Also, referring to Fig. 7(c), the case of t=3 can be considered as a case where the time axis cyclic transposition is also taken into account. Here, all resources when the cyclic transposition is performed by f=9 may conflict with the case of t=1. That is, according to the diagonal pattern (or existing system pattern) {11,10,9,8,7,6,5,4,3,2,1,0}, when the frequency axis cyclic transposition and the time axis cyclic transposition are considered together, orthogonality cannot be maintained due to conflicts, so the pattern may not be expanded based on this.

[0146] FIG. 8 is a drawing showing a DL PRS pattern of comb size 12 applicable to the present disclosure in which orthogonality is maintained after cyclic transposition.

[0147] Referring to FIG. 8, if mutual orthogonality is maintained even after frequency-axis cyclic transposition and time-axis cyclic transposition are performed, orthogonality can be increased, thereby allowing each DL PRS to be distinguished. For example, in the case of a comb size of 12 using 12 symbols, a DL PRS assignment pattern that maintains orthogonality even after cyclic transposition may be {0,1,4,2,9,5,11,3,8,10,7,6}. Also, for example, in the case of a comb size of 6 using 6 symbols, a DL PRS assignment pattern that maintains orthogonality even after cyclic transposition may be {0,2,1,4,5,3}. As a specific example, the above-described pattern can be derived based on the “Costas Array by Logarithmic Welch method” as a case satisfying the following Equation 3. Here, P can be a prime number, and Equation 3 can be an array function and a method for a pattern that avoids collisions.

[0148] [Mathematical Formula 3]

[0149]

[0150] Let a be a primitive element in modular arithmetic for a prime p. Then f:{1, 2, ..., p-1}→{1, 2, ..., p-1} defined by f(i)=logai may be a (P-1)*(P-1) modular sonar sequence.

[0151] Based on the above mathematical formula 3, cases where P is a prime number, such as 12*12, 6*6, and 4*4, can be considered. Based on the above mathematical formula 3, for a comb size of 12, the DL PRS assignment pattern can be derived as {0,1,4,2,9,5,11,3,8,10,7,6}. Additionally, for a comb size of 6, the DL PRS assignment pattern can be derived as {0,2,1,4,5,3}. The pattern for the case of a comb size of 12 may be as shown in FIG. 8.

[0152] Specifically, referring to FIG. 8(a), the pattern to which DL PRS is assigned may be {0,1,4,2,9,5,11,3,8,10,7,6} based on Equation 3. Here, f=y may be the case where there is a cyclic shift of y along the frequency axis and no shift along the time axis (i.e., t=0). For example, when f=0, there is no shift along the frequency axis and no shift along the time axis, so the DL PRS assignment pattern may be {0,1,4,2,9,5,11,3,8,10,7,6}. Also, when f=1, there is a shift of 1 along the frequency axis and no shift along the time axis, so the pattern may be {1,2,5,3,10,6,12,4,9,11,8,7}. In addition, when f=y, it is a case where the frequency is transposed by y along the frequency axis and the transposition along the time axis is not performed. Also, when t=x, it is a case where the frequency is transposed by x along the time axis and the transposition along the frequency axis is not performed.

[0153] Also, when t=1, since it is transposed by 1 along the time axis and not along the frequency axis, the DL PRS pattern can be {1,4,2,9,5,11,3,8,10,7,6,0}. Here, if the orthogonality of each resource can be maintained after cyclic transposition along the frequency axis or the time axis, the orthogonality can be increased based on the cyclic transposition.

[0154] Referring to FIG. 8(a), orthogonality for each resource can be maintained when cyclic transposition is performed only along the frequency axis. That is, orthogonality can be maintained regardless of which two resources from f=0 to f=11 are selected. Additionally, the case of t=1 can be considered as a case where cyclic transposition along the time axis is also taken into account. Here, orthogonality can be maintained regardless of which two resources from f=0 to f=11 are selected. However, for example, in the case of f=6, some resources (two) may collide, but since the number of collisions is not large, performance degradation may be small.

[0155] Additionally, referring to FIG. 8(b), the case of t=2 can be considered as a case where time-axis cyclic transposition is also taken into account. Here, orthogonality can be maintained regardless of which two resources from f=0 to f=11 are selected. However, for example, when f=5 or f=7, some resources (two) may collide, but since the number of collisions is not large, the performance degradation may be small. Additionally, referring to FIG. 8(c), the case of t=3 can be considered as a case where time-axis cyclic transposition is also taken into account. Here, orthogonality can be maintained regardless of which two resources from f=0 to f=11 are selected. However, for example, when f=2 or f=10, some resources (two) may collide, but since the number of collisions is not large, the performance degradation may be small.

[0156] When determining the DL PRS allocation pattern for a comb size of 12 based on the above mathematical formula 3, an orthogonal pattern or a pseudo-orthogonal pattern can be obtained based on frequency axis cyclic transposition and time axis cyclic transposition, thereby increasing orthogonality.

[0157] FIG. 9 is a drawing showing a DL PRS pattern of comb size 6 applicable to the present disclosure. The DL PRS pattern according to the present invention can be applied in the same way to comb size 6.

[0158] Referring to Fig. 9(a), there may be a method of assigning DL PRS based on {0,3,1,4,2,5} as a DL PRS pattern. Here, when performing frequency axis cyclic transposition and time axis cyclic transposition, orthogonality may not be maintained because collisions occur when f=3 and f=4 and t=1.

[0159] Figure 9 (b) may be a method for assigning DL PRS to a diagonal pattern {5,4,3,2,1,0}. Here, when performing frequency axis cyclic transposition and time axis cyclic transposition, orthogonality may not be maintained because all resources at f=5 and at t=1 will conflict.

[0160] Figure 9(c) may be a pattern {0, 2, 1, 4, 5, 3} for maintaining an orthogonal pattern after cyclic transposition based on the above mathematical formula 3. Here, when performing frequency axis cyclic transposition and time axis cyclic transposition, orthogonality can be maintained regardless of which two resources f=0 to f=5 are selected. However, for example, when f=3, some resources (two) may collide, but since the number of collisions is not large, performance degradation may be small.

[0161] According to the present invention, when determining the DL PRS allocation pattern for comb size 6 based on the above mathematical formula 3, an orthogonal pattern or a pseudo-orthogonal pattern can be obtained based on frequency axis cyclic transposition and time axis cyclic transposition, thereby increasing orthogonality.

[0162] FIGS. 10 and 11 illustrate a method for performing cyclic transposition based on a DL PRS assignment pattern applicable to the present disclosure. The DL PRS assignment pattern may lose orthogonality due to conflicts when performing both frequency-axis cyclic transposition and time-axis cyclic transposition. Therefore, when performing cyclic transposition based on a DL PRS assignment pattern, only frequency-axis cyclic transposition may be possible.

[0163] Referring to FIG. 10, in the case of a comb size of 6, DL PRS is assigned to 6 symbols in a pattern such as {0, 3, 1, 4, 2, 5}, and 6 patterns can be formed by frequency axis cyclic transposition, and FIG. 10 may be a resource allocation method for the case of f=0 and f=2.

[0164] Referring to FIG. 11, in the case where the comb size is 12, DL PRS is assigned as a pattern {0, 6, 3, 9, 1, 7, 4, 10, 2, 8, 5, 11} to 12 symbols, and 12 patterns may be possible with frequency axis cyclic transposition, and FIG. 11 may be a resource allocation method for the case where f=0 and f=2.

[0165] FIGS. 12 to 14 illustrate a method for performing cyclic transposition based on a DL PRS assignment pattern that maintains orthogonality even after cyclic transposition applicable to the present disclosure.

[0166] When determining the DL PRS assignment pattern based on the above mathematical formula 3, orthogonality can be maintained even when both frequency-axis cyclic transposition and time-axis cyclic transposition are performed. This allows performance requirements to be satisfied even if some orthogonality is broken. Here, when performing cyclic transposition based on the DL PRS assignment pattern based on the above mathematical formula 3, frequency-axis cyclic transposition may be possible. Additionally, when performing cyclic transposition, both frequency-axis cyclic transposition and time-axis cyclic transposition may be possible.

[0167] Referring to FIG. 12, in the case of a comb size of 6, where DL PRS is assigned to 6 symbols, based on Equation 3, for the case {0, 2, 1, 4, 5, 3}, 6 patterns may be possible through frequency axis cyclic transposition. Additionally, in the case of a comb size of 6, where DL PRS is assigned to 6 symbols, based on Equation 3, for the case {0, 2, 1, 4, 5, 3}, 36 patterns may be possible based on frequency axis cyclic transposition and time axis cyclic transposition. That is, orthogonality may be increased. At this time, as described above, since orthogonality is increased, it may be possible to distinguish each DL PRS resource.

[0168] Here, the PRS resource ID may correspond to each DL PRS resource. Based on the DL PRS pattern described above, the frequency axis shift value and the time axis shift value of the PRS resource ID may differ. As another example, the frequency axis shift value and the time axis shift value may differ depending on the PRS sequence ID, thereby allowing the DL PRS to be distinguished. The frequency axis shift value may be set differently depending on the PRS resource ID. Additionally, the time axis shift value may be set differently depending on the PRS resource set ID. Furthermore, the frequency axis shift value may be set differently depending on the PRS resource ID. Additionally, the time axis shift value may be set differently depending on the PRS sequence ID.

[0169] For example, FIG. 12 may be based on the above-described DL PRS pattern {0,2,1,4,5,3} and may be cases where f=0, f=2, t=1, and f=1 / t=1, and orthogonality may be maintained in each case.

[0170] As another example, referring to FIGS. 13 and 14, in the case where the comb size is 12 and DL PRS is assigned to 12 symbols, if the pattern is {0,6,3,9,1,7,4,10,2,8,5,11} based on Equation 3, 12 patterns may be possible through frequency axis cyclic transposition. As another example, in the case where the comb size is 12 and DL PRS is assigned to 12 symbols, if the pattern is {0,6,3,9,1,7,4,10,2,8,5,11} based on Equation 3, 144 patterns may be possible based on frequency axis cyclic transposition and time axis cyclic transposition. That is, orthogonality may be increased. At this time, since orthogonality is increased, it may be possible to distinguish each DL PRS resource.

[0171] The above PRS resource ID may correspond to each DL PRS resource. In this case, the frequency axis shift value and the time axis shift value of the PRS resource ID may differ based on the DL PRS pattern described above. As another example, the frequency axis shift value and the time axis shift value may differ depending on the PRS sequence ID, thereby allowing the DL PRS to be distinguished. Additionally, the frequency axis shift value may be set differently depending on the PRS resource ID. Furthermore, the time axis shift value may be set differently depending on the PRS resource set ID. Additionally, the frequency axis shift value may be set differently depending on the PRS resource ID. Furthermore, the time axis shift value may be set differently depending on the PRS sequence ID.

[0172] FIG. 13 may be the case where f=0 and f=2 based on the DL PRS pattern {0,6,3,9,1,7,4,10,2,8,5,11}. FIG. 14 may be the case where t=1 and f=1 / t=1 based on the DL PRS pattern {0,6,3,9,1,7,4,10,2,8,5,11}.

[0173] Next, we would like to propose a method to reduce overhead. As an example, a new muting pattern to prevent collisions between multiple TRPs can be considered.

[0174] FIG. 15 is a diagram illustrating a DL PRS resource allocation method applicable to the present disclosure.

[0175] In a communication system according to the present invention, DL PRS muting may be supported. When a terminal is instructed to mute a DL PRS, the terminal may mute the corresponding DL PRS. Here, a DL PRS muting bitmap for a DL PRS resource set may be configured, and based thereon, a DL PRS to be muted may be instructed to the terminal. At this time, each bit of the DL PRS muting bitmap (hereinafter referred to as the Option 1 bitmap) may correspond to each occasion or consecutive instances within the DL PRS resource set. Here, each DL PRS occasion may correspond to the entire DL PRS resource (including repeated transmissions) within each DL PRS period. That is, one DL PRS occasion may correspond to one DL PRS period.

[0176] In this case, if a specific bit indicates muting, all DL PRS within the occupancy or consecutive instances corresponding to the specific bit may be muted. For example, DL PRS of an existing system (LTE) may also be muted on an occupancy basis as described above. As another example, a bitmap indicating muting (hereinafter referred to as Option 2 bitmap) may indicate muting for each DL PRS resource within an occupancy or instance for one period. Here, each bit of the bitmap may correspond to the repetition index of each DL PRS resource within an occupancy or instance for one period (i.e., each bit corresponds to one repetition of the DL PRS within each DL PRS period), and muting may be indicated by each bit. In this case, the bitmap may be composed of any one of 2, 4, 8, 16, or 32 bits.

[0177] For example, regarding the muting options, at least one of the Option 1 bitmap and the Option 2 bitmap may be configured in the terminal. For example, only the Option 1 bitmap may be configured in terminal 1. Also, only the Option 2 bitmap may be configured in terminal 2. For example, both the Option 1 bitmap and the Option 2 bitmap may be configured in terminal 3. In this case, if both the Option 1 bitmap and the Option 2 bitmap are configured in the terminal, all DL PRS resources within the occupations where muting is instructed based on Option 1 are muted, and among the occupations where muting is not instructed, DL PRS resources in which muting is instructed by the Option 2 bitmap may be muted.

[0178] Referring to FIG. 15(a), the terminal can check the DL PRS period and offset indicated based on the DL PRS configuration. In FIG. 15(a), the period is set to 10 slots and the offset is set to 2 slots, but this is merely one example and is not limited to the embodiments described above. Additionally, the terminal can check the repetition pattern of DL PRS resources within the period through the “DL-PRS-ResourceRepetitionFactor” indicated based on the DL PRS configuration. Additionally, the “DL-PRS-ResourceRepetitionFactor” is set to indicate 2 repetitions, but this is merely one example and is not limited to the embodiments described above. The terminal can check the time interval between DL PRS resources within one period through the “DL-PRS-ResourceTimeGap” indicated based on the DL PRS configuration. For example, in FIG. 15 (a), “DL-PRS-ResourceTimeGap” is set to one slot, but this is just one example and is not limited to the embodiments described above.

[0179] Referring to FIG. 15(b), the terminal can perform muting based on the option 1 bitmap. For example, the option 1 bitmap may be a 2-bit muting bitmap for two periods, and each bit corresponds to one occupancy corresponding to one period. In this case, muting for the corresponding occupancy can be performed based on each bit. Also, for example, the option 2 bitmap may be a 2-bit bit where the repetition of each DL PRS within one period corresponds to each bit.

[0180] If muting is instructed to the terminal based on the above Option 1 bitmap, all DL PRSs of the corresponding occupancy may be muted. On the other hand, in the case of the Option 2 bitmap, among the occupancy where muting is not instructed to the terminal based on the Option 1 bitmap, the DL PRS that is instructed to be muted through the Option 2 bitmap may be muted. That is, among the DL PRSs, only the DL PRS resources that are instructed not to be muted by both the Option 1 bitmap and the Option 2 bitmap may be used. As a specific embodiment, in FIG. 15 (b), each DL PRS occupancy (1510-1, 1510-2, 1510-3, 1510-4) may correspond to each PRS period. Here, the first DL PRS application (1510-1) may correspond to “period #0”, the second DL PRS application (1510-2) to “period #1”, the third DL PRS application (1510-3) to “period #2”, and the fourth DL PRS application (1510-4) to “period #3”.

[0181] Since each bit of the Option 1 bitmap corresponds to a DL PRS location, the Option 1 bitmap may be 2 bits. Here, among the 2-bit Option 1 bitmaps corresponding to the first DL PRS location (1510-1) and the second DL PRS location (1510-2), if the bit corresponding to the first DL PRS location (1510-1) indicates muting, all DL PRS resources (1520-1, 1520-2) within the first DL PRS location (1510-1) are muted. Additionally, if the bit corresponding to the second DL PRS location (1510-2) among the 2-bit Option 1 bitmap indicates muting, all DL PRS resources (1520-3, 1520-4) within the second DL PRS location (1510-2) are muted.

[0182] Meanwhile, if the bit corresponding to the third DL PRS location (1510-3) among the 2-bit option 1 bitmaps corresponding to the third DL PRS location (1510-3) indicates muting, all DL PRS resources (1520-5, 1520-6) within the third DL PRS location (1510-3) are muted. Additionally, if the bit corresponding to the fourth DL PRS location (1510-4) among the 2-bit option 1 bitmaps indicates muting, all DL PRS resources (1520-7, 1520-8) within the fourth DL PRS location (1510-4) are muted.

[0183] Additionally, each DL PRS occupancy (1510-1, 1510-2, 1510-3, 1510-4) may contain iterations of DL PRS resources. For example, the first DL PRS occupancy (1510-1) contains two iterations (1520-1, 1520-2) of DL PRS resources. The second DL PRS occupancy (1510-2) also contains two iterations (1520-3, 1520-4) of DL PRS resources. The third DL PRS occupancy (1510-3) also includes two iterations (1520-5, 1520-6) of the DL PRS resource, and the fourth DL PRS occupancy (1510-4) also includes two iterations (1520-7, 1520-8) of the DL PRS resource.

[0184] At this time, each bit of the option 2 bitmap can correspond to an iteration of each DL PRS resource. Thus, within the first DL PRS occupancy (1510-1), the option 2 bitmap is composed of 2 bits by 2 iterations (1520-1, 1520-2) of the DL PRS resource.

[0185] Here, if the option 1 bitmap indicates that the first DL PRS location (1510-1) is muted, the second iteration (1520-1, 1520-2) of the DL PRS resource is muted regardless of the option 2 bitmap. On the other hand, if the option 1 bitmap indicates that the first DL PRS location (1510-1) is not muted, the second iteration (1520-1, 1520-2) of the DL PRS resource is indicated to be muted by the option 2 bitmap. Here, if the bit corresponding to the first iteration (1520-1) of the DL PRS resource among the 2-bit option 2 bitmap indicates muting, the corresponding DL PRS resource (1520-1) is muted. Additionally, if the bit corresponding to the second iteration (1520-2) of the DL PRS resource in the 2-bit Option 2 bitmap indicates muting, the DL PRS resource (1520-2) is muted. The Option 2 bitmap can be applied when the Option 1 bitmap indicates that it is not muted.

[0186] Referring to FIG. 16, a bitmap (hereinafter referred to as Option 3 bitmap) for directing muting in units of N symbols to reduce the delay of resource repetition can be configured together with Option 1 bitmap and Option 2 bitmap. For example, Option 3 bitmap can be applied based on a comb size unit. That is, N can be equal to the comb size.

[0187] In FIG. 16, each DL PRS resource (1620-1, 1620-2, 1620-3, 1620-4, 1620-5, 1620-6, 1620-7, 1620-8) consists of L DL PRS symbols. Here, L can be 2, 4, 6, or 12, as shown in Table 8.

[0188] As shown in Fig. 16, each DL PRS is configured within one slot, and as mentioned, one DL PRS is composed of L DL PRS symbols within one slot.

[0189] Additionally, L symbols may be composed of A repetitions of N symbols. Here, N can be 1 or a comb size. For example, FIG. 17(a) corresponds to A=2 when N is a comb size 2 (N=2), FIG. 17(b) corresponds to A=3 when N is a comb size 2 (N=2), and FIG. 17(c) corresponds to A=6 when N is a comb size 2 (N=2). Also, FIG. 18(a) corresponds to A=3 when N is a comb size 4 (N=4), and FIG. 18(b) corresponds to A=2 when N is a comb size 6 (N=6).

[0190] Here, the first iteration (1620-1) of the DL PRS resource within the DL PRS occupation (1610-1) in FIG. 16 may consist of A iterations of N symbols within one slot, as seen in FIG. 17 and FIG. 18. Likewise, the second iteration (1620-2) of the DL PRS resource within the DL PRS occupation (1610-1) in FIG. 16 may also consist of A iterations of N symbols within one slot, as seen in FIG. 17 and FIG. 18.

[0191] Each DL PRS resource (1620-3, 1620-4, 1620-5, 1620-6, 1620-7, 1620-8) within the DL PRS occupancy (1610-2), DL PRS occupancy (1610-3), and DL PRS occupancy (1610-4) in FIG. 16 can likewise be composed of A repetitions of N symbols within a single slot, as seen in FIG. 17 and FIG. 18.

[0192] In this case, each bit of the Option 3 bitmap can correspond to each of A repetitions of N symbols. That is, within a single slot, bits can be corresponded to units of each of N symbols. Therefore, within each DL PRS resource (1620-1, 1620-2, 1620-3, 1620-4, 1620-5, 1620-6, 1620-7, 1620-8), the Option 3 bitmap is composed of A bits by A repetitions of N symbols.

[0193] As a specific embodiment, each DL PRS occupation (1610-1, 1610-2, 1610-3, 1610-4) may correspond to each PRS period. Here, the first DL PRS occupation (1610-1) may correspond to “period #0”, the second DL PRS occupation (1610-2) to “period #1”, the third DL PRS occupation (1610-3) to “period #2”, and the fourth DL PRS occupation (1610-4) to “period #3”.

[0194] Since each bit of the Option 1 bitmap corresponds to a DL PRS location, the Option 1 bitmap may be 2 bits. Here, among the 2-bit Option 1 bitmaps corresponding to the first DL PRS location (1610-1) and the second DL PRS location (1610-2), if the bit corresponding to the first DL PRS location (1610-1) indicates muting, all DL PRS resources (1620-1, 1620-2) within the first DL PRS location (1610-1) are muted. Additionally, if the bit corresponding to the second DL PRS location (1610-2) among the 2-bit Option 1 bitmap indicates muting, all DL PRS resources (1620-3, 1620-4) within the second DL PRS location (1610-2) are muted.

[0195] Meanwhile, if the bit corresponding to the third DL PRS location (1610-3) among the 2-bit option 1 bitmaps corresponding to the third DL PRS location (1610-3) indicates muting, all DL PRS resources (1620-5, 1620-6) within the third DL PRS location (1610-3) are muted. Additionally, if the bit corresponding to the fourth DL PRS location (1610-4) among the 2-bit option 1 bitmaps indicates muting, all DL PRS resources (1620-7, 1620-8) within the fourth DL PRS location (1610-4) are muted.

[0196] Additionally, each DL PRS occupancy (1610-1, 1610-2, 1610-3, 1610-4) may contain iterations of DL PRS resources. For example, the first DL PRS occupancy (1610-1) contains two iterations (1620-1, 1620-2) of DL PRS resources. The second DL PRS occupancy (1610-2) also contains two iterations (1620-3, 1620-4) of DL PRS resources. The third DL PRS occupancy (1610-3) also includes two iterations (1620-5, 1620-6) of the DL PRS resource, and the fourth DL PRS occupancy (1610-4) also includes two iterations (1620-7, 1620-8) of the DL PRS resource.

[0197] At this time, each bit of the option 2 bitmap can correspond to an iteration of each DL PRS resource. Thus, within the first DL PRS occupancy (1610-1), the option 2 bitmap is composed of 2 bits by 2 iterations (1620-1, 1620-2) of the DL PRS resource.

[0198] Here, if the option 1 bitmap indicates that the first DL PRS location (1610-1) is muted, the second iteration (1620-1, 1620-2) of the DL PRS resource is muted regardless of the option 2 bitmap. On the other hand, if the option 1 bitmap indicates that the first DL PRS location (1610-1) is not muted, the second iteration (1620-1, 1620-2) of the DL PRS resource is indicated to be muted by the option 2 bitmap. Here, if the bit corresponding to the first iteration (1620-1) of the DL PRS resource among the 2-bit option 2 bitmap indicates muting, the corresponding DL PRS resource (1620-1) is muted. Additionally, if the bit corresponding to the second iteration (1620-2) of the DL PRS resource in the 2-bit Option 2 bitmap indicates muting, the DL PRS resource (1620-2) is muted. The Option 2 bitmap can be applied when the Option 1 bitmap indicates that it is not muted.

[0199] On the other hand, if the bit corresponding to the first iteration (1620-1) of the DL PRS resource in the Option 2 bitmap indicates that it is not muted, then if the bit of the Option 3 bitmap corresponding to N DL PRS symbols in the first iteration (1620-1) of the DL PRS resource indicates that it is muted, then the corresponding DL PRS is muted.

[0200] That is, for A bits corresponding to N DL PRS symbols in the first iteration (1620-1) of the DL PRS resource, if the bit value is 0 (or 1), the corresponding DL PRS is muted, and conversely, if the bit value is 1 (or 0), the corresponding DL PRS is not muted.

[0201] For example, if N=2 and A=6 and the bit value of the option 3 bitmap is 100010, then out of a total of 2*6=12 symbols, the DL PRS in the 1st / 2nd symbol and the 9th / 10th symbol are not muted, and the DL PRS in the remaining symbols are muted.

[0202] As another example, if N=4 and A=3 and the bit value of the option 3 bitmap is 010, then out of a total of 4*3=12 symbols, the DL PRS in the 5th / 6th / 7th / 8th symbols is not muted, and the DL PRS in the remaining symbols is muted.

[0203] This applies equally to the other DL PRS resources (1620-2, 1620-3, 1620-4, 1620-5, 1620-6, 1620-7, 1620-8) illustrated in FIG. 16. However, FIG. 16 is merely one example and is not limited thereto.

[0204] In this case, regarding the application of the Option 3 bitmap, the Option 1 bitmap and / or Option 2 bitmap may or may not exist. If both the Option 1 bitmap and the Option 2 bitmap exist, the Option 3 bitmap may be applied when the Option 1 bitmap and the Option 2 bitmap are indicated not to be muted. If the Option 1 bitmap does not exist, the operation should be performed as if the Option 1 bitmap is indicated not to be muted. Likewise, if the Option 2 bitmap does not exist, the operation should be performed as if the Option 2 bitmap is indicated not to be muted.

[0205] FIGS. 17 and 18 are drawings showing more specifically an option 3 bitmap applicable to the present disclosure.

[0206] Referring to FIG. 17, when the comb size within the slot is 2 (Comb-2), each bit of the Option 3 bitmap can correspond to 2 symbols. Referring to FIG. 17 (a), a case can be considered where 4 DL PRS symbols are assigned as DL-PRS in a single slot as a single PRS repetition. In this case, since 1 bit corresponds to every 2 DL PRS symbols, the Option 3 bitmap can be 2 bits when there are 4 symbols.

[0207] Referring to Fig. 17(b), a case can be considered in which 6 DL PRS symbols are assigned as DL-PRS in a single slot as a single PRS repetition. In this case, since 1 bit corresponds to every 2 symbols, the option 3 bitmap can be 3 bits in the case of 6 symbols.

[0208] Referring to Fig. 17(c), a case can be considered in which 12 DL PRS symbols are assigned as DL-PRS in a single slot as a single PRS repetition. In this case, since 1 bit corresponds to every 2 symbols, the option 3 bitmap can be 6 bits in the case of 12 symbols.

[0209] Referring to FIG. 18(a), when the comb size within the slot is 4 (Comb 4), each bit of the Option 3 bitmap can correspond to 4 DL PRS symbols. For example, consider the case where 12 DL PRS symbols are allocated as DL-PRS in one slot as a single PRS repetition. In this case, since 1 bit corresponds to each of 4 DL PRS symbols, the Option 3 bitmap can be 3 bits when there are 12 symbols.

[0210] Referring to FIG. 18(b), when the comb size within the slot is 6 (Comb 6), each bit of the Option 3 bitmap can correspond to 6 DL PRS symbols. For example, consider the case where 12 DL PRS symbols are allocated as DL-PRS in a single slot as a single PRS repetition. In this case, since 1 bit corresponds to each of 6 DL PRS symbols, the Option 3 bitmap can be 2 bits when there are 12 symbols.

[0211] The above Option 3 bitmap can instruct muting for DL ​​PRS in corresponding symbol units based on comb size units. Here, if muting is instructed to the terminal based on the above Option 1 bitmap, all DL PRS of the corresponding occupancy may be muted. On the other hand, in the case of the Option 2 bitmap, among occupancy where muting was not instructed to the terminal based on the Option 1 bitmap, all DL PRS of the corresponding iteration where muting is instructed through the Option 2 bitmap may be muted. That is, among the DL PRS, only DL PRS resources in which both the Option 1 bitmap and the Option 2 bitmap are instructed not to be muted may be used, as described above.

[0212] Additionally, in the case of the Option 3 bitmap, among the occupations not muted to the terminal based on the Option 1 bitmap, DL PRSs that are muted in units of N symbols via the Option 3 bitmap within the iteration not muted via the Option 2 bitmap may be muted. That is, among the DL PRSs, only DL PRS resources that are not muted by the Option 1 bitmap, the Option 2 bitmap, and the Option 3 bitmap may be used.

[0213] Therefore, in the new communication system, muting for DL ​​PRS can be flexibly directed, thereby reducing overhead and satisfying requirements considering positioning.

[0214] Next, we will explain the case where positioning is performed based on an uplink. For ease of explanation, positioning is referred to as “UL SRS for positioning” below; however, this is merely a designation and is not limited to the aforementioned designation. Furthermore, it may be applied to newly proposed communication systems with a different designation, and may also be applied in a form that changes according to the new communication system. Additionally, the uplink-based positioning disclosed in the present invention may be performed through an SRS for positioning. The SRS for positioning is referred to as “SRS for positioning,” but is not limited to the aforementioned designation.

[0215] For example, an SRS for positioning operations can be generated in an NR system. Here, the number of SRS symbols can be 1, 2, or 4 for SRS for MIMO (Multi Input Multi Output). However, since more SRS may be required for positioning, the number of SRS symbols can be 1, 2, 4, 8, or 12. Additionally, the position of the SRS symbols can be from the end of the slot up to the Nth symbol (N=0, 1…13). That is, SRS symbols can be assigned based on the end of the slot. Also, for example, the number of SRS combs can be 2, 4, or 8, which will be described later. Additionally, for example, an offset can be applied to the SRS mapping, as shown in Table 9 below.

[0216] [Table 9]

[0217]

[0218] The sequence of SRS may be a Zadoff-chu-based sequence. For example, an SRS sequence may be generated based on the following Equation 4. Here, n may be a subcarrier index and l' may be a symbol. At this time, And, It can be. pi can be an antenna port. For example, since an SRS for positioning uses only one antenna port, the above pi value can be 1. can be a Cyclic Shift (CS) value, and may be equal to the following mathematical formulas 5 and 6, and an SRS sequence can be generated based thereon. In this case, in mathematical formula 6 It can be. Here, the SRS sequence can maintain orthogonality by shifting the phase based on the following mathematical formulas 5 and 6.

[0219] [Mathematical Formula 4]

[0220]

[0221] [Mathematical Formula 5]

[0222]

[0223] [Mathematical Formula 6]

[0224]

[0226] According to the present invention, the number of combs in the SRS can be varied to 2, 4, or 8. For example, in the case of an LTE system, the number of combs can be 4, and based on this, 12 CSs can be used. The number of combs according to the present invention can be set by applying different numbers depending on the system to which it is applied.

[0227] When considering the SRS for positioning in the new communication system according to the present invention, if the comb size is 2, the maximum number of CSs may be 8. Also, if the comb size is 4, the maximum number of CSs may be 12. Additionally, since the SRS can be used for positioning, a case where the comb size is 8 can also be considered.

[0228] For example, the SRS for positioning may support only one antenna port. The SRS for positioning does not support frequency hopping, and frequency axis allocation may be supported in 4-PRB units from 4 PRB to 272 PRB. Additionally, for the SRS for positioning, aperiodicity may be supported in the same way as the aperiodic SRS. Information regarding the antenna port, frequency hopping, frequency allocation, and period may be indicated through upper-level signaling.

[0229] For SRSs intended for positioning, requirements must be satisfied by considering IIoT scenarios or use cases; to achieve this, methods to increase orthogonality or reduce overhead may be required.

[0230] To this end, the number of symbols in the SRS for positioning may be 1, 2, 4, 8, or 12. Additionally, the comb size for positioning may be 2, 4, or 8. Here, the SRS may be a sequence based on phase transposition with a Zadov-Choo sequence. In this case, CS may be a value for phase transposition, and each value phase-transposed based on the CS value may maintain orthogonality. In this regard, Table 10 below indicates the number of orthogonal resources within a single slot. Here, the number of orthogonal resources can be expressed as the product of the comb size and the maximum number of CSs. Specifically, when the comb size is 2, the maximum number of CSs is 8, so the number of orthogonal resources may be 16. Also, when the comb size is 4, the maximum number of CSs is 12, so the number of orthogonal resources may be 48. In addition, when the comb size is 8, the maximum number of CS is 6, so the number of orthogonal resources can be 48, as shown in Table 10 below.

[0231] In addition, Table 11 shows the number of orthogonal resources considering a delay spread environment. In this case, the number of orthogonal resources can be the product of the staggered pattern and the maximum number of CS. For example, considering a delay spread environment, when the comb size is 2, orthogonality can be maintained when there are 2 SRS symbols.

[0232] On the other hand, when only one SRS symbol exists, orthogonality is not maintained by delayed diffusion, so the number of patterns that maintain orthogonality can be reduced by half. This staggered pattern, considering delayed diffusion, is when the comb size is 2 and the SRS symbol is 1, and it can be 1. Conversely, the staggered pattern, considering delayed diffusion, is when the comb size is 2 and the SRS symbol is 2 or more, and it can be 2. Likewise, the staggered pattern, considering delayed diffusion, is when the comb size is 4 and the SRS symbol is 2, and it can be 2. Conversely, the staggered pattern, considering delayed diffusion, is when the comb size is 4 and the SRS symbol is 4 or more, and it can be 4. The above staggered pattern, considering delayed diffusion, is when the comb size is 8 and the SRS symbol is 4, and it can be 4. On the other hand, the staggered pattern considering delayed diffusion is the case where the comb size is 8, and if the SRS symbol is 8 or more, it can be 8. Based on the above, in a delayed diffusion environment, when the number of SRS symbols is small, the number of orthogonal resources in Table 11 can be reduced compared to Table 10.

[0233] [Table 10]

[0234]

[0235] [Table 11]

[0236]

[0237] Furthermore, when considering use cases for new communication systems (e.g., NR) or IIoT scenarios, one may consider environments with high cell density and small cell sizes. In such cases, a large number of orthogonal resources may be required to avoid collisions between cells. For example, in an IIoT scenario, positioning can be performed using a single symbol, and applying Table 11 above may result in a reduction of orthogonal resources. To reiterate, regarding positioning requirements, it is necessary to consider environments with small cell sizes and latency spreading. In other words, a design may be required to satisfy the requirements for low latency in environments with small cell sizes and latency spreading. In this case, one can consider increasing the maximum number of CSs to maintain orthogonality. The number of orthogonal resources can be the product of the maximum number of CSs and a pattern that accounts for latency spreading. Therefore, increasing the maximum number of CSs can increase the number of orthogonal resources. However, for example, since the SRS symbol is a Zadov-Chou sequence and CS can be a value for phase transposition, increasing the number of CS may reduce the phase value corresponding to each sequence. Here, if the phase value corresponding to each sequence is small, the impact can be significant if phase delay occurs. In other words, orthogonality may not be maintained due to phase delay. Therefore, a method to determine the maximum number of CS may be necessary.

[0238] For example, the maximum CS number can be determined as shown in Table 12 below. When the comb size is 2, the existing maximum CS number can be 8. Here, the maximum CS number can be determined as {8, 12, 24, 48} or {8, 12, 24, 48, 96}. Also, when the comb size is 4, the maximum CS number can be 12, or, {12, 24} or {12, 24, 48}. Also, when the comb size is 8, the maximum CS number can be 6. Considering this, the maximum CS number can be determined as {6, 12, 24} or {6, 12, 24}.

[0239] [Table 12]

[0240]

[0241] Here, even when determining the maximum number of CS as shown in Table 12 below, orthogonality may not be practically guaranteed if the number of available subcarriers (i.e., the number of frequency axis REs) within the allocated PRB (Physical Resource Block) is not divisible by the maximum number of CS. As a method to solve this problem, for example, when resources are allocated in units of 4 PRB (= 48 REs) and the comb size is 2, the number of frequency axis REs per pattern may be 24. In this case, if the comb size is 2 and the maximum number of CS is 8, orthogonality can be maintained because 24 is a multiple of 8. On the other hand, if the maximum number of CS is 16 or 48, orthogonality may not be maintained because it is not a multiple of 24.

[0242] More specifically, Table 13 below indicates cases where orthogonality is maintained and cases where it is not. In this case, when the comb size is 2 and the maximum CS number is set to 48 or 96, orthogonality may not be maintained because 24 RE is allocated per pattern for a single 4 PRB unit. Also, when the comb size is 4, orthogonality may be maintained if the maximum CS number is 12 because 12 RE (48 RE / 4) is allocated per pattern for a 4 PRB unit. On the other hand, orthogonality may not be maintained if the maximum CS number is 24 or 48. Additionally, when the comb size is 8, orthogonality may be maintained if the maximum CS number is 6 because 6 RE (48 RE / 8) is allocated per pattern for a 4 PRB unit. On the other hand, orthogonality may not be maintained if the maximum CS number is 12 or 24.

[0243] [Table 13]

[0244]

[0245] As explained, it is necessary to consider the number of PRBs when determining the maximum CS number for orthogonality. For example, the maximum CS number can be determined by considering the number of allocated PRBs and the comb size. That is, the maximum CS number can have different values ​​depending on the number of allocated PRBs and the comb size. In this case, referring to Table 14, the terminal can check the number of allocated PRBs and the comb size through upper-level signaling. At this time, the maximum CS number can be selected from among the maximum CS numbers having different ranges based on the signaled information on the number of allocated PRBs and the comb size. That is, the terminal checks the aforementioned signaled information on the number of allocated PRBs and the comb size through signaling and can select a specific maximum CS number value from the corresponding group of maximum CS number candidates. Here, for example, the specific maximum CS number value selected from the group of maximum CS number candidates can also be indicated through upper-level signaling, but is not limited thereto.

[0246] Specifically, in Table 14 can be the number of PRBs. In this case, Case #1 could be a case where it is in 4PRB units. That is, ( )mod4=0, ( )mod8≠0, ( )mod16 ≠ 0. Here, mod refers to a modular operation. In this case, when the comb size is 2, the maximum CS number can be 8, 12, or 24. Here, the terminal may be instructed to a specific maximum CS number among 8, 12, or 24 through upstream signaling. Also, when the comb size is 4, the maximum CS number is 12, and the terminal may select 12 as the maximum CS number. Also, when the comb size is 8, the maximum CS number is 6, and the terminal may select 6 as the maximum CS number.

[0247] also, Case #2 could be the case where it is in 8PRB units. That is, ( )mod8=0, ( )mod16≠0 may be true. In this case, when the comb size is 2, the maximum CS number may be 8, 12, 24, or 48. Here, the terminal may be instructed to a specific maximum CS number among 8, 12, 24, or 48 through upstream signaling. Also, when the comb size is 4, the maximum CS number may be 12 or 24. Here, the terminal may be instructed to a specific maximum CS number among 12 or 24 through upstream signaling. Also, when the comb size is 8, the maximum CS number may be 6 or 12. Here, the terminal may be instructed to a specific maximum CS number among 6 or 12 through upstream signaling.

[0248] also, Case #3 could be a case where it is in 16PRB units. That is, ( )mod16=0. In this case, if the comb size is 2, the maximum CS number can be 8, 12, 24, 48, or 96. Here, the terminal may be instructed to a specific maximum CS number among 8, 12, 24, 48, or 96 through upstream signaling. Also, if the comb size is 4, the maximum CS number can be 12, 24, or 48. Here, the terminal may be instructed to a specific maximum CS number among 12, 24, or 48 through upstream signaling. Also, if the comb size is 8, the maximum CS number can be 6, 12, or 24. Here, the terminal may be instructed to a specific maximum CS number among 6, 12, or 24 through upstream signaling.

[0249] That is, the terminal can select the maximum number of CS based on information regarding the number of PRBs and the comb size.

[0250] [Table 14]

[0251]

[0252] As another example, the terminal can select a specific maximum CS number from among maximum CS numbers with different ranges based on the comb size allocated through upper-level signaling. Here, the upper-level signaling may be Radio Resource Control (RRC) signaling. In this case, the terminal may be instructed through the upper-level signaling to select the specific maximum CS number from among maximum CS numbers with different ranges. Here, as an example, the maximum CS numbers with different ranges may be as shown in Table 15 below. That is, the terminal may not receive signaling information regarding the PRB number, thereby reducing signaling overhead. Here, the PRB number may be reflected in advance.

[0253] [Table 15]

[0254]

[0255] Specifically, the SRS for positioning can be defined based on a single antenna port. In this case, for example, since it is defined based on a single antenna port, Equation 5 for the aforementioned CS value may be equal to Equation 7 below. Here, It may be possible. In addition, as described above, in order to reflect the PRB number in advance, the following mathematical formula 7 can be changed as mathematical formula 8.

[0256] [Mathematical Formula 7]

[0257]

[0258] [Mathematical Formula 8]

[0259]

[0261] In the above mathematical formula 8, the value of A is the maximum number of allocated PRBs ( ), value for the maximum number of CS( ) and comb size( It can be determined based on at least one of the following. That is, the CS value can be derived differently depending on the A value.

[0262] For example, in the case of mathematical formula 9, A=1. If the product of the comb size and the maximum number of CS is less than 48, A=1. That is, if resource allocation is possible in units of 4PRB (48RE) based on the comb size and the maximum number of CS, then the following mathematical formula 9 can be satisfied, and the number of CS can be determined based on this.

[0263] [Mathematical Formula 9]

[0264]

[0265] On the other hand, we can consider the case where the product of the comb size and the maximum number of CS satisfies Equation 10. In this case, considering the number of PRBs ( If )mod8=0, then A=1. On the other hand, ( If )mod8≠0, then A can be 2. Here, if A is 2, the possible CS values( ) becomes smaller, allowing for the derivation of a value that maintains orthogonality.

[0266] In the following mathematical formula 10, in the case of 8 PRB units, A can be 1, and based on this, the CS number is determined, and in the case of 4 PRB units, A can be 2, and the CS number value can be reduced.

[0267] [Mathematical Formula 10]

[0268]

[0269] In addition, we can consider the case where the product of the comb size and the maximum number of CS satisfies Equation 11. In this case, considering the number of PRBs ( If )mod16=0, then A can be 1. On the other hand, ( )mod16≠0 and, ( If )mod8=0, then A can be 2. On the other hand, ( )mod16≠0 and, ( If )mod8≠0, A can be 4. That is, in the case of 16PRB units in the following mathematical formula 11, A is 1, and based on this, the CS number can be determined.

[0270] On the other hand, in the case of 8 PRB units, A can be reduced to 2, and the CS number value can be reduced to 1 / 4, and in the case of 4 PRB units, A can be reduced to 4.

[0271] [Mathematical Formula 11]

[0272]

[0273] Here, In this case, when the comb size is 2, the maximum number of CS ( ) can be 8, 12, or 24. Also, when the comb size is 4, the maximum number of CS ( ) can be 12. Also, when the comb size is 8, the maximum number of CS ( ) can be 6. Also, In this case, when the comb size is 2, the maximum number of CS ( ) can be 48. Also, when the comb size is 4, the maximum number of CS ( ) can be 24. Also, when the comb size is 8, the maximum number of CS ( ) can be 12 days.

[0274] As mentioned above, PRB number ( If ) is a multiple of 8 (i.e., in the 8PRB unit), all CS values ​​( A can be 1 so that all of ) can be applied. On the other hand, if it is not a multiple of 8 A can be 2 so that only 1 / 2 of it can be applied. In this case, and In practice, the same value can be applied. At this time, the phase of CS is applied one full turn in 4PRB units, so that orthogonality can be maintained.

[0275] also, In this case, when the comb size is 2, the maximum number of CS ( ) can be 96. Also, when the comb size is 4, the maximum number of CS ( ) can be 48. Also, when the comb size is 8, the maximum number of CS ( ) can be 24 days.

[0276] As mentioned above, PRB number ( If ) is a multiple of 16 (i.e., in units of 16PRB), all CS values ​​( A can be 1 so that all of ) can be applied. On the other hand, if it is a multiple of 8 but not a multiple of 16 (i.e., in the case of an 8PRB unit), A can be 2 so that only 1 / 2 of it can be applied. In this case, and In practice, the same value can be applied. Therefore, the phase of CS can be applied one full turn in 8PRB units, and orthogonality can be maintained.

[0277] On the other hand, if it is neither a multiple of 16 nor a multiple of 8 (i.e., in the case of a 4PRB unit), A can be 4 so that only 1 / 4 of it can be applied. In this case, and , , The values ​​can be practically the same. Therefore, the CS phase can be applied one full turn in 4PRB units to maintain orthogonality.

[0278] For example, Table 16 below may be an example of a 4PRB allocation. Here, And, It may correspond to (CS value * subcarrier index), and It can be 1.

[0279] [Table 16]

[0280]

[0281] As another example, the above-mentioned mathematical formula 8 can be changed to the following mathematical formula 12.

[0282] [Mathematical Formula 12]

[0283]

[0284] Here, the value of A is the maximum number of allocated PRBs ( ), value for the maximum number of CS( ) and comb size( It can be determined based on at least one of ). That is, the CS value can be derived differently depending on the value of A, and this may be identical to the aforementioned mathematical formulas 9 to 11 and Table 16. When A is 1, All can be applied. On the other hand, if A is 2, Only 1 / 2 of it can be applied. Also, if A is 4, Only 1 / 4 of it can be applied.

[0285] In this case, for example, when A=2, only 1 / 2 is applied, and when A=4, only 1 / 4 is applied, there is a need to improve performance for positioning, and the B value can be used. However, this can be applied when transmitting SRS for positioning in multiple symbols.

[0286] Specifically, if A is 1, B can be 0, which may be the same as the existing one. On the other hand, if A is 2, B can be set to 0 in the SRS transmission symbol for the first positioning. On the other hand, B can be set to 1 in the SRS transmission for the second positioning. Additionally, the SRS transmission symbol for the third positioning is the same as the SRS transmission symbol for the first positioning, and the SRS transmission symbol for the fourth positioning is the same as the SRS transmission symbol for the second positioning, and may be repeated in subsequent symbols.

[0287] In addition, if A is 4, B can be set to 0 in the SRS transmission symbol for the first positioning. On the other hand, B can be set to 2 in the SRS transmission for the second positioning. In addition, B can be set to 1 in the SRS transmission for the third positioning. In addition, B can be set to 3 in the SRS transmission for the fourth positioning. In addition, the SRS transmission symbol for the fifth positioning is the same as the SRS transmission symbol for the first positioning, the SRS transmission symbol for the sixth positioning is the same as the SRS transmission symbol for the second positioning, the SRS transmission symbol for the seventh positioning is the same as the SRS transmission symbol for the third positioning, and the SRS transmission symbol for the eighth positioning is the same as the SRS transmission symbol for the fourth positioning, and can be repeated in subsequent symbols.

[0288] Therefore, even when A is 2, if we consider 2 symbols All of them can be used. Also, even if A is 4, for the 4 symbols All of them can be used.

[0289] In this case, for example, Table 17 below may be an example of 4PRB allocation when A is 2 based on the aforementioned mathematical formula 12. Here, And, It may correspond to (CS value * subcarrier index), and can be 1. Also, is 48, and It can be 2 days.

[0290] [Table 17]

[0291]

[0292] In addition, Table 18 below may be an example of 4PRB allocation when A is 4, based on the aforementioned mathematical formula 12. Here, And, It may correspond to (CS value * subcarrier index), and can be 1. Also, is 48, and It can be 2 days.

[0293] [Table 18]

[0294]

[0295] FIG. 19 is a flowchart illustrating an example of a method for generating a PRS applicable to the present disclosure.

[0296] For example, the terminal may receive DL PRS configuration information from a base station (S1910). At this time, as described above in FIGS. 5 to 14, the DL PRS configuration information may include information related to DL PRS reception. Here, the DL PRS configuration information may include comb size and DL PRS allocation pattern information. For example, the comb size may be 2, 4, 6, or 12, as described above. Also, for example, the DL PRS allocation pattern may be derived based on Equation 3 so that orthogonality is maintained even when frequency axis transposition and time axis transposition are performed as described above. For example, when the comb size is 6, the DL PRS allocation pattern may be {0, 2, 1, 4, 5, 3}. Also, as an example, when the comb size is 12, the DL PRS assignment pattern can be {0,1,4,2,9,5,11,3,8,10,7,6}.

[0297] The terminal receives a DL PRS based on a comb size and a DL PRS allocation pattern (S1910), and can perform location estimation based on the received DL PRS (S1920). This is as described above in FIGS. 5 to 16, and the DL PRS resource-related ID can be distinguished based on the time-axis shift value and the frequency-axis shift value based on the DL PRS allocation pattern. At this time, the terminal can receive the DL PRS based on the DL PRS resource-related ID. For example, the PRS resource ID can correspond to each DL PRS resource. At this time, the frequency-axis shift value and the time-axis shift value of the PRS resource ID may be different based on the DL PRS pattern described above. As another example, the frequency axis shift value and the time axis shift value may differ depending on the PRS sequence ID, thereby allowing DL PRS to be distinguished. As yet another example, the frequency axis shift value may be set differently depending on the PRS resource ID. Additionally, the time axis shift value may be set differently depending on the PRS resource set ID. As yet another example, the frequency axis shift value may be set differently depending on the PRS resource ID. Additionally, the time axis shift value may be set differently depending on the PRS sequence ID, as described above.

[0298] Additionally, as an example, the terminal may receive bitmap information from the base station instructing the DL PRS muting. At this time, the terminal may perform DL PRS muting based on the received bitmap information. At this time, the bitmap information may include at least one of a first bitmap information, a second bitmap information, and a third bitmap information. At this time, the first bitmap information may instruct the muting of the DL PRS on an occupancy unit basis. Additionally, the second bitmap information may instruct the muting of the DL PRS on a repeat unit basis within an occupancy unit basis. Here, the repeat unit basis may be a single slot. Additionally, as an example, the third bitmap information may instruct the muting of the DL PRS on a plurality of symbol units basis within a repeat unit basis.

[0299] FIG. 20 is a flowchart illustrating an example of a method for generating a PRS applicable to the present disclosure.

[0300] Referring to FIG. 20, the terminal can receive information related to SRS transmission for positioning from a base station. (S2010) At this time, as described in Equations 4 to 12 and Tables 9 to 19 above, the terminal can receive information related to SRS transmission through upper-level signaling. The terminal receives comb size information related to SRS transmission and PRB information related to SRS transmission through upper-level signaling, and can determine the comb size and CS number therefrom. As another example, the terminal receives comb size information related to SRS transmission through upper-level signaling, and can determine the comb size and CS number therefrom. (S2020)

[0301] For example, when resources are allocated in units of 4 PRBs, orthogonality may not be maintained based on the comb size and the maximum number of CSs, so the number of PRBs may be changed as described above. Subsequently, the terminal may perform SRS transmission based on the determined comb size and number of CSs. (S2030)

[0302] FIG. 21 is a drawing showing a base station device and a terminal device to which the present disclosure can be applied.

[0303] The base station device (2100) may include a processor (2120), an antenna unit (2112), a transceiver (2114), and a memory (2116).

[0304] The processor (2120) performs baseband-related signal processing and may include an upper layer processing unit (2130) and a physical layer processing unit (2140). The upper layer processing unit (2130) may process operations of the MAC (Medium Access Control) layer, the RRC (Radio Resource Control) layer, or higher upper layers. The physical layer processing unit (2140) may process operations of the physical (PHY) layer (e.g., uplink reception signal processing, downlink transmission signal processing). In addition to performing baseband-related signal processing, the processor (2120) may also control operations of the base station device (2100).

[0305] The antenna unit (2112) may include one or more physical antennas, and if it includes multiple antennas, it may support MIMO (Multiple Input Multiple Output) transmission and reception. Additionally, it may support beamforming. Here, the antenna unit (2112) supports MIMO transmission and reception and beamforming through an antenna pattern in an antenna array that includes multiple antennas. Different antenna port indices are assigned to the antenna ports depending on the type of channel being transmitted. At this time, since multiple antennas may have the same antenna port index, the actual number of physical antennas may be multiple even if only one antenna port is used. Multiple antenna ports may be used in the above SRS transmission. However, only one antenna port may be used in the SRS transmission for positioning of the present invention. The transceiver (2114) may include a radio frequency (RF) transmitter and an RF receiver.

[0306] The memory (2116) can store information processed by the processor (2120), software related to the operation of the base station device (2100), an operating system, an application, etc., and may include components such as a buffer.

[0307] The processor (2120) of the base station (2100) can be configured to implement the operation of the base station in the embodiments described in the present invention.

[0308] The terminal device (2150) may include a processor (2170), an antenna unit (2162), a transceiver (2164), and a memory (2166). In one example, the terminal device (2150) in the present invention may communicate with a base station device (2100). In another example, the terminal device (2150) in the present invention may perform side-link communication with another terminal device. That is, the terminal device (2150) of the present invention refers to a device capable of communicating with at least one of the base station device (2100) and another terminal device, and is not limited to communication with a specific device.

[0309] The processor (2170) performs baseband-related signal processing and may include an upper layer processing unit (2180) and a physical layer processing unit (2190). The upper layer processing unit (2180) may process operations of the MAC layer, RRC layer, or higher layers. The physical layer processing unit (2190) may process operations of the PHY layer (e.g., downlink reception signal processing, uplink transmission signal processing). In addition to performing baseband-related signal processing, the processor (2170) may also control operations across the terminal device (2150).

[0310] The antenna section (2162) may include one or more physical antennas, and if it includes multiple antennas, it may support MIMO transmission and reception. Additionally, it may support beamforming. Here, the antenna section (2112) supports MIMO transmission and reception and beamforming through an antenna pattern in an antenna array that includes multiple antennas. Different antenna port indices are assigned to the antenna ports depending on the type of channel being transmitted. At this time, since multiple antennas may have the same antenna port index, the actual number of physical antennas may be multiple even if only one antenna port is used. Multiple antenna ports may be used in the above SRS transmission. However, only one antenna port may be used in the SRS transmission for positioning of the present invention. The transceiver (2164) may include an RF transmitter and an RF receiver.

[0311] The memory (2166) can store information processed by the processor (2170), software related to the operation of the terminal device (2150), an operating system, an application, etc., and may include components such as a buffer.

[0312] Here, the processor (2170) of the terminal device (2150) can receive DL PRS configuration information from the base station (2100). At this time, the DL PRS configuration information may include comb size and DL PRS allocation pattern information as DL PRS reception-related information. For example, the comb size may be 2, 4, 6, or 12. In addition, the DL PRS allocation pattern is derived based on Equation 3 so that orthogonality can be maintained even when frequency axis transposition and time axis transposition are performed. When the comb size is 6, the DL PRS allocation pattern may be {0, 2, 1, 4, 5, 3}. In addition, when the comb size is 12, the DL PRS allocation pattern may be {0, 1, 4, 2, 9, 5, 11, 3, 8, 10, 7, 6}.

[0313] The processor (2170) of the terminal device (2150) receives the DL PRS from the base station (2100) based on the comb size and the DL PRS allocation pattern. The processor (2170) of the terminal device (2150) can perform location estimation based on the received DL PRS. Here, the DL PRS resource-related ID is distinguished based on the time-axis shift value and the frequency-axis shift value based on the DL PRS allocation pattern. The processor (2170) of the terminal device (2150) receives the DL PRS from the base station (2100) based on the DL PRS resource-related ID. For example, the PRS resource ID may correspond to each DL PRS resource. In this case, the frequency-axis shift value and the time-axis shift value of the PRS resource ID may be different based on the DL PRS pattern. As another example, the frequency shift and time shift values ​​may differ depending on the PRS sequence ID, which allows for the identification of DL PRS. As yet another example, the frequency shift value may be set differently depending on the PRS resource ID. Additionally, the time shift value may be set differently depending on the PRS resource set ID. As yet another example, the frequency shift value may be set differently depending on the PRS resource ID. Additionally, the time shift value may be set differently depending on the PRS sequence ID.

[0314] Additionally, the processor (2170) of the terminal device (2150) may receive bitmap information from the base station (2100) that instructs DL PRS muting. The processor (2170) of the terminal device (2150) performs DL PRS muting based on the received bitmap information. The bitmap information may include at least one of a first bitmap information, a second bitmap information, and a third bitmap information. In this case, the first bitmap information may instruct muting for DL ​​PRS in units of occupations. Additionally, the second bitmap information may instruct muting for DL ​​PRS in units of repetitions within an occupation. Here, the repetition unit may be a single slot. Additionally, as an example, the third bitmap information may instruct muting for DL ​​PRS in units of multiple symbols within a repetition based on comb sizes.

[0315] Additionally, the processor (2120) of the base station (2100) may transmit DL PRS configuration information from the terminal device (2150). At this time, the DL PRS configuration information may include comb size and DL PRS allocation pattern information as DL PRS reception-related information. For example, the comb size may be 2, 4, 6, or 12. Also, the DL PRS allocation pattern is derived based on Equation 3 so that orthogonality can be maintained even when frequency axis transposition and time axis transposition are performed. When the comb size is 6, the DL PRS allocation pattern may be {0, 2, 1, 4, 5, 3}. Also, when the comb size is 12, the DL PRS allocation pattern may be {0, 1, 4, 2, 9, 5, 11, 3, 8, 10, 7, 6}.

[0316] The processor (2120) of the base station (2100) transmits the DL PRS from the terminal device (2150) based on the comb size and the DL PRS allocation pattern. The terminal device (2150) can perform location estimation based on the received DL PRS. Here, the DL PRS resource-related ID is distinguished based on the time-axis shift value and the frequency-axis shift value based on the DL PRS allocation pattern. The processor (2120) of the base station (2100) transmits the DL PRS to the terminal device (2150) based on the DL PRS resource-related ID. For example, the PRS resource ID may correspond to each DL PRS resource. In this case, the frequency-axis shift value and the time-axis shift value of the PRS resource ID may be different based on the DL PRS pattern. As another example, the frequency shift and time shift values ​​may differ depending on the PRS sequence ID, which allows for the identification of DL PRS. As yet another example, the frequency shift value may be set differently depending on the PRS resource ID. Additionally, the time shift value may be set differently depending on the PRS resource set ID. As yet another example, the frequency shift value may be set differently depending on the PRS resource ID. Additionally, the time shift value may be set differently depending on the PRS sequence ID.

[0317] Additionally, the processor (2120) of the base station (2100) may transmit bitmap information instructing DL PRS muting to the terminal device (2150). Through this, the terminal device (2150) performs DL PRS muting based on the received bitmap information. The bitmap information may include at least one of the first bitmap information, the second bitmap information, and the third bitmap information. In this case, the first bitmap information may instruct muting for DL ​​PRS in units of occupations. Additionally, the second bitmap information may instruct muting for DL ​​PRS in units of repetitions within an occupation. Here, the repetition unit may be a single slot. Additionally, as an example, the third bitmap information may instruct muting for DL ​​PRS in units of multiple symbols within a repetition based on the comb size.

[0318] Additionally, the processor (2170) of the terminal device (2150) can receive information related to SRS transmission for positioning from the base station (2100). For example, the processor (2170) of the terminal device (2150) can receive information related to SRS transmission from the base station (2100) through upper-level signaling. The processor (2170) of the terminal device (2150) receives information related to SRS transmission comb size and PRB through upper-level signaling, and can determine the comb size and CS number.

[0319] As another example, the processor (2170) of the terminal device (2150) receives comb size information related to SRS transmission through upper-level signaling, and can determine the comb size and the number of CS through this. Here, if resources are allocated in units of 4 PRB, orthogonality may not be maintained based on the comb size and the maximum number of CS, so the number of PRBs may be changed.

[0320] Additionally, the processor (2120) of the base station (2100) can transmit information related to SRS transmission for positioning to the terminal device (2150). For example, the processor (2120) of the base station (2100) can transmit information related to SRS transmission to the terminal device (2150) through upper-level signaling. The processor (2120) of the base station (2100) transmits information related to SRS transmission comb size and PRB to the terminal device (2150) through upper-level signaling, and the terminal device (2150) can determine the comb size and CS number through this.

[0321] As another example, the processor (2120) of the base station (2100) can transmit comb size information related to SRS transmission to the terminal device (2150) through upper-level signaling. The terminal device (2150) can determine the comb size and the number of CS based on the received information. Here, if resources are allocated in units of 4 PRB, the number of PRBs may be changed because orthogonality may not be maintained based on the comb size and the maximum number of CSs.

[0322] The Industrial Internet of Things (IIoT) to which the present invention applies includes devices such as sensors and equipment that are interconnected via a network with industrial sectors of computers, including manufacturing and energy management. Communication / connection of each unit according to the present invention includes the ability to communicate through a system that supports enhanced communication technologies based on 5G, NR wireless communication systems, and LTE / LTE-A. The IIoT system to which the present invention applies is an advancement of the Distributed Control System (DCS) and enables a high level of automation by using cloud computing to improve process control. The IIoT system to which the present invention applies may include a layered modular structure of digital technology. The user interface device of the IIoT system to which the present invention applies may include a wireless processing device capable of processing applications and content, such as a screen configuration device, a tablet, and a smart glass. This wireless processing device may include application software and a processing unit that analyzes data and converts it into information. CPS, sensor, machine. The network layer includes a physical network bus that collects and transmits data to the service layer, cloud computing, and communication protocols; this service layer may also be implemented through a separate unit of a communication device that processes PRS and SRS configurations in accordance with the application of the present invention. Accordingly, the service layer of the IIoT system according to the present invention can be configured as an application that manipulates data and merges it into information that can be displayed on a driver dashboard, and can be displayed through a wireless processing device via a screen and display unit through the content layer, which is the highest layer, i.e., the user interface.

[0323] In addition, various embodiments of the present disclosure may be implemented by hardware, firmware, software, or a combination thereof. In the case of implementation by hardware, it 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, etc.

[0324] The scope of the present disclosure includes software or machine-executable instructions (e.g., operating system, application, firmware, program, etc.) that enable an operation according to a method of various embodiments to be executed on a device or computer, and a non-transitory computer-readable medium on which such software or instructions, etc. are stored and executable on a device or computer.

[0325] The various embodiments of the present disclosure are not intended to list all possible combinations but to describe representative aspects of the present disclosure, and the matters described in the various embodiments may be applied independently or in combination of two or more. Explanation of the symbols

[0329] 2100: Base station 2112: Base station antenna 2120: Base station processor 2114: Base station transceiver 2130: Base station upper layer processing unit 2116: Base station memory 2140: Base station physical layer processing unit 2150 : Terminal 2162 : Terminal's antenna 2170: Terminal processor 2164: Terminal transceiver 2180: Terminal's upper-layer processing unit 2166: Terminal's memory 2190 : Physical layer processing unit of the terminal

Claims

Claim 1 A method of operation of a wireless user device in a wireless communication system comprises the step of receiving downlink positioning reference signal (DL PRS) configuration information from a base station, wherein the received DL PRS configuration information includes a DL PRS reception-related comb size and a DL PRS allocation pattern; and the step of receiving a DL PRS from the base station based on the DL PRS reception-related comb size and the DL PRS allocation pattern. and a step of estimating a location based on the received DL PRS; wherein the DL PRS resource-related ID is distinguished based on a time-axis shift value and a frequency-axis shift value based on the DL PRS allocation pattern, and the wireless user device receives the DL PRS based on the DL PRS resource-related ID, and the wireless user device further receives bitmap information instructing DL PRS muting from the base station and performs DL PRS muting based on the received bitmap information, wherein the bitmap information includes at least one of a first bitmap information instructing DL PRS muting in an occupancy unit, a second bitmap information instructing DL PRS muting in a repeat unit within the occupancy, and a third bitmap information instructing DL PRS muting in a plurality of symbol units within the repeat, and when DL PRS muting is instructed to the wireless user device through the first bitmap information, based on the first bitmap information among each DL PRS occupancy within the DL PRS resource set When the DL PRS is received through at least one DL PRS occupancy not indicated by DL PRS muting, and the DL PRS muting is indicated to the wireless user device through the first bitmap information and the second bitmap information,A location estimation method comprising: receiving the DL PRS through at least one DL PRS iteration not indicated for DL ​​PRS muting based on the second bitmap information in each of the at least one DL PRS occupies not indicated for DL ​​PRS muting based on the first bitmap information among the DL PRS resource sets; and, when the DL PRS muting is indicated to the wireless user device through the first bitmap information, the second bitmap information, and the third bitmap information, receiving the DL PRS through at least one DL PRS symbol not indicated for DL ​​PRS muting based on the third bitmap information in at least one DL PRS iteration not indicated for DL ​​PRS muting based on the second bitmap information in each of the at least one DL PRS occupies not indicated for DL ​​PRS muting based on the first bitmap information among the DL PRS resource sets. Claim 2 delete Claim 3 delete Claim 4 A position estimation method according to claim 1, further comprising: receiving information related to the transmission of a sounding reference signal (SRS) from a base station; determining a comb size related to the transmission of the SRS and a number of cyclic shifts (CS) based on the received information related to the transmission of the SRS; and transmitting an SRS based on the determined comb size related to the transmission of the SRS and the number of CS; wherein the information related to the transmission of the SRS includes at least one of the comb size related to the transmission of the SRS and a physical resource block (PRB), and the SRS is a positioning reference signal. Claim 5 A wireless user device in a wireless communication system comprises: at least one antenna receiving at least one wireless signal from a base station; at least one processor; and a memory storing instructions that cause the wireless user device to perform a specific operation by the at least one processor, wherein the specific operation comprises: receiving downlink positioning reference signal (DL PRS) configuration information from a base station, wherein the received DL PRS configuration information includes a DL PRS reception related comb size and a DL PRS allocation pattern; and receiving a DL PRS from the base station based on the DL PRS reception related comb size and the DL PRS allocation pattern; and a location is estimated based on the received DL PRS, wherein the DL PRS resource-related ID is distinguished based on a time-axis shift value and a frequency-axis shift value based on the DL PRS allocation pattern, and the DL PRS is received based on the DL PRS resource-related ID, and the wireless user device further receives bitmap information instructing DL PRS muting from the base station and performs DL PRS muting based on the received bitmap information, wherein the bitmap information includes at least one of a first bitmap information instructing DL PRS muting in an occupancy unit, a second bitmap information instructing DL PRS muting in a repeat unit within the occupancy, and a third bitmap information instructing DL PRS muting in a plurality of symbol units within the repeat, and when DL PRS muting is instructed to the wireless user device through the first bitmap information, among each DL PRS occupancy within the DL PRS resource set, DL PRS muting is performed based on the first bitmap information The DL PRS is received through at least one unspecified DL PRS occupancy, andWhen DL PRS muting is indicated to the wireless user device through the first bitmap information and the second bitmap information, the DL PRS is received through at least one DL PRS iteration that is not indicated for DL ​​PRS muting based on the second bitmap information in each of the at least one DL PRS occupants within the DL PRS resource set that is not indicated for DL ​​PRS muting based on the first bitmap information, and when DL PRS muting is indicated to the wireless user device through the first bitmap information, the second bitmap information, and the third bitmap information, the DL PRS muting based on the third bitmap information in at least one DL PRS iteration that is not indicated for DL ​​PRS muting based on the second bitmap information in each of the at least one DL PRS occupants within the DL PRS resource set that is not indicated for DL ​​PRS muting based on the first bitmap information A wireless user device receiving the DL PRS through at least one unspecified DL PRS symbol. Claim 6 delete Claim 7 delete Claim 8 A wireless user device according to claim 5, wherein the specific operation comprises: receiving information related to the transmission of a sounding reference signal (SRS) from a base station, determining a comb size and a number of cyclic shifts (CS) related to the transmission of the SRS based on the received information related to the transmission of the SRS, and transmitting an SRS based on the determined comb size and number of CS, wherein the information related to the transmission of the SRS includes at least one of the comb size and a physical resource block (PRB), and the SRS is a positioning reference signal.

Images