Method and device by which communication device performs network-controlled repeater-based communication in wireless communication system

Abstract

Various NCR-based communication methods are being considered due to the introduction of NCRs in a next-generation wireless communication system, and the influence of the NCR introduction on the next-generation wireless communication system is being discussed. Accordingly, the present specification proposes a method and device by which a communication device performs network-controlled repeater-based communication in a wireless communication system.

Description

Method and device for performing network control repeater-based communication of a communication device in a wireless communication system

[0001] This specification relates to wireless communications, and more particularly, to a method and device for performing network control repeater-based communication of a communication device in a wireless communication system.

[0002] A network-controlled repeater (NCR) is an enhancement to conventional RF repeaters, capable of receiving and processing side control information from the network. Side control information, or auxiliary control information, can enable the NCR to perform AF operations more efficiently. Potential benefits include mitigation of unnecessary noise amplification, improved spatial directivity for transmission and reception, and simplified network integration.

[0003] With the introduction of NCR in next-generation wireless communication systems, various NCR-based communication methods are being considered, and the impact of NCR on next-generation wireless communication systems is being discussed. Accordingly, this specification proposes a method and device for performing network control repeater-based communication for communication devices in a wireless communication system.

[0004] According to one embodiment, a method performed by a network-controlled repeater (NCR) in a wireless communication system is proposed. The method is characterized in that the method transmits capability information to a base station, the capability information including BWP capability information for a bandwidth part (BWP) supported by the NCR for an access link between the NCR and a terminal transmitting and receiving data with the NCR, receives configuration information from the base station, the configuration information including BWP configuration information for the access link, receives control information from the base station, the control information including BWP switching information for the access link, and performs BWP switching for the access link based on the control information.

[0005] Here, the control information includes first control information and second control information, the first control information is transmitted through a first PDCCH (physical downlink control channel), the second control information is transmitted through a MAC CE (medium access control control element), and the BWP switching information may be included in the second control information.

[0006] Here, the first control information may indicate a resource to which the second control information is allocated.

[0007] Here, the first PDCCH is scrambled based on a first RNTI (Radio Network Temporary Identifier) ​​defined for controlling the NCR, and the first RNTI can be indicated through the configuration information.

[0008] Here, the bandwidth of the target BWP for which the NCR performs the BWP switching is greater than or equal to the bandwidth of the cell specific BWP set for the base station, and the BWP capability information may indicate the granularity for the BWP supported by the NCR for the access link.

[0009] Here, the BWP switching information may include at least one of information about a target BWP of the BWP switching, information about a beam on which the BWP switching is performed, and information about a time domain resource on which the BWP switching is performed.

[0010] Here, the information about the time domain resource may include at least one of information about the period and duration for the BWP transition.

[0011] Here, the control information is transmitted through a second PDCCH, and based on the BWP switching information being information only for the NCR, the second PDCCH may be scrambled based on a second RNTI, and based on the BWP switching information being information for a plurality of NCRs including the NCR, the second PDCCH may be scrambled based on a third RNTI.

[0012] Here, the capability information indicates a maximum power level for an access link between the NCR and a terminal transmitting and receiving data with the NCR, the configuration information indicates an initial power level for the access link, the control information includes power control information related to transmission power of the NCR for the access link, and the NCR transmits response information to the control information to the base station, wherein the power control information includes first information on a target transmission power value of the NCR for the access link, and the response information may include second information on an actual transmission power value of the NCR for the access link.

[0013] According to another embodiment, a network-controlled repeater (NCR) is proposed, comprising: one or more memories storing commands; one or more transceivers; and one or more processors connecting the one or more memories and the one or more transceivers, wherein the one or more processors execute the commands to transmit capability information to a base station, wherein the capability information includes BWP capability information for a bandwidth part (BWP) supported by the NCR for an access link between the NCR and a terminal transmitting and receiving data with the NCR; receiving configuration information from the base station, wherein the configuration information includes BWP configuration information for the access link; receiving control information from the base station, wherein the control information includes BWP switching information for the access link; and performing BWP switching for the access link based on the control information.

[0014] Here, the control information includes first control information and second control information, the first control information is transmitted through a first PDCCH (physical downlink control channel), the second control information is transmitted through a MAC CE (medium access control control element), and the BWP switching information may be included in the second control information.

[0015] Here, the control information is transmitted through a second PDCCH, and based on the BWP switching information being information only for the NCR, the second PDCCH may be scrambled based on a second RNTI, and based on the BWP switching information being information for a plurality of NCRs including the NCR, the second PDCCH may be scrambled based on a third RNTI.

[0016] Here, the BWP capability information may indicate the granularity of the BWP supported by the NCR for the access link.

[0017] Here, the capability information indicates a maximum power level for an access link between the NCR and a terminal transmitting and receiving data with the NCR, the configuration information indicates an initial power level for the access link, the control information includes power control information related to transmission power of the NCR for the access link, and the NCR transmits response information to the control information to the base station, wherein the power control information includes first information on a target transmission power value of the NCR for the access link, and the response information may include second information on an actual transmission power value of the NCR for the access link.

[0018] According to another embodiment, there is proposed at least one computer-readable recording medium comprising instructions that are executed by at least one processor included in a network-controlled repeater (NCR), the recording medium being configured to transmit capability information to a base station, the capability information including BWP capability information for a bandwidth part (BWP) supported by the NCR for an access link between the NCR and a terminal transmitting and receiving data with the NCR, and configured to receive configuration information from the base station, the configuration information including BWP configuration information for the access link, and configured to receive control information from the base station, the control information including BWP switching information for the access link, and configured to perform BWP switching for the access link based on the control information.

[0019] Here, the control information includes first control information and second control information, the first control information is transmitted through a first PDCCH (physical downlink control channel), the second control information is transmitted through a MAC CE (medium access control control element), and the BWP switching information may be included in the second control information.

[0020] Here, the control information is transmitted through a second PDCCH, and based on the BWP switching information being information only for the NCR, the second PDCCH may be scrambled based on a second RNTI, and based on the BWP switching information being information for a plurality of NCRs including the NCR, the second PDCCH may be scrambled based on a third RNTI.

[0021] Here, the BWP capability information indicates the granularity of the BWP supported by the NCR for the access link, and the bandwidth of the target BWP of the BWP switching may be greater than or equal to the bandwidth of the cell specific BWP set for the base station.

[0022] Here, the BWP switching information may include at least one of information about a target BWP of the BWP switching, information about a beam on which the BWP switching is performed, and information about a time domain resource on which the BWP switching is performed.

[0023] Here, the capability information indicates a maximum power level for an access link between the NCR and a terminal transmitting and receiving data with the NCR, the configuration information indicates an initial power level for the access link, the control information includes power control information related to transmission power of the NCR for the access link, and the processor transmits response information for the control information to the base station, wherein the power control information includes first information for a target transmission power value of the NCR for the access link, and the response information may include second information for an actual transmission power value of the NCR for the access link.

[0024] According to one embodiment of the present disclosure, by compensating the signal strength of an NCR in various environments, the communication quality of the NCR and the quality of the cell can be improved. Furthermore, since information related to the compensation is transmitted to neighboring cells to modify handover parameters, the efficiency of handover can be increased. By controlling the bandwidth portion of the NCR, the effect of network energy conservation can be increased. In addition, by performing positioning using NCR information, the accuracy of positioning can be improved.

[0025] The effects that can be achieved through specific examples of this specification are not limited to the effects listed above. For example, a person with ordinary skill in the relevant technical field may understand or derive various technical effects from this specification. Accordingly, the specific effects of this specification are not limited to those explicitly described herein, but may include various effects that can be understood or derived from the technical features of this specification.

[0026] The following drawings are intended to illustrate specific examples of the present specification. The names of specific devices and the names of specific signals, messages, and fields depicted in the drawings are provided for illustrative purposes only, and the technical features of this specification are not limited to the specific names used in the drawings.

[0027] FIG. 1 is a conceptual diagram illustrating a wireless communication system according to one embodiment of the present invention.

[0028] FIG. 2 is an exemplary diagram showing a 5G system to which a data transmission method according to one embodiment of the present invention can be applied.

[0029] FIG. 3 is a diagram for explaining a resource grid supported by a wireless access technology to which the present invention can be applied.

[0030] FIG. 4 is a diagram for explaining a bandwidth part (BWP) supported by a wireless access technology to which the present invention can be applied.

[0031] FIG. 5 is a diagram illustrating an example of a synchronization signal block (SSB: Sync. Signal Block) in a wireless access technology to which the present invention can be applied.

[0032] Figure 6 illustrates an example conceptual model of a network control relay.

[0033] Figure 7 illustrates an example of BWP transition.

[0034] Figure 8 illustrates an example of the format of MAC CE for beam control of an NCR access link.

[0035] FIG. 9 is a flowchart illustrating an example of controlling BWP switching via MAC CE according to one embodiment of the present specification.

[0036] Figure 10 illustrates an example in which BWP adjustment is performed according to the frequency band location and bandwidth of the cell-specific BWP of the gNB and the BWP of the NCR access link.

[0037] FIG. 11 is a flowchart illustrating an example of controlling BWP switching via PDCCH according to one embodiment of the present specification.

[0038] FIG. 12 is a flowchart illustrating an example of controlling power of an NCR access link via MAC CE according to one embodiment of the present specification.

[0039] FIG. 13 is a flowchart illustrating an example of controlling power of an NCR access link via a PDCCH according to one embodiment of the present specification.

[0040] FIG. 14 illustrates an example of a positioning service provision procedure to which embodiments of the present specification can be applied.

[0041] FIG. 15 is a drawing for explaining an example of a positioning method considering a beam index to which embodiments of the present specification can be applied.

[0042] FIG. 16 illustrates an example of a positioning procedure according to one embodiment of the present specification.

[0043] FIG. 17 illustrates another example of a positioning procedure according to one embodiment of the present specification.

[0044] FIG. 18 is a flowchart of an example of a positioning method according to one embodiment of the present specification.

[0045] Figure 19 illustrates a terminal and network node in which an embodiment of the present specification is implemented.

[0046] The present invention is susceptible to various modifications and embodiments. Specific embodiments are illustrated in the drawings and described in detail in the detailed description. However, this is not intended to limit the present invention to specific embodiments, but rather to encompass all modifications, equivalents, and alternatives falling within the spirit and technical scope of the present invention. Throughout the description of each drawing, similar reference numerals have been used to designate similar components.

[0047] Although the terms "first," "second," "A," "B," etc. may be used herein to describe various components, the components should not be limited by these terms. These terms are used solely to distinguish one component from another. For example, without departing from the scope of the present invention, the first component could be referred to as the second component, and similarly, the second component could also be referred to as the first component. Furthermore, the term "and / or" includes any combination of multiple related listed items or any one of multiple related listed items.

[0048] When a component is referred to as being "connected" or "connected" to another component, it should be understood that it may be directly connected or connected to that other component, but that there may be other components intervening. Conversely, when a component is referred to as being "directly connected" or "connected" to another component, it should be understood that there are no other components intervening.

[0049] The terminology used herein is for the purpose of describing specific embodiments only and is not intended to limit the present invention. The singular expression includes the plural expression unless the context clearly indicates otherwise. In this specification, it should be understood that the terms "comprises" or "has" indicate the presence of a feature, number, step, operation, component, part, or combination thereof described in the specification, but do not exclude in advance the possibility of the presence or addition of one or more other features, numbers, steps, operations, components, parts, or combinations thereof.

[0050] Unless otherwise defined, the terms used herein, including technical or scientific terms, have the same meanings commonly understood by those of ordinary skill in the art to which the present invention pertains. Terms defined in commonly used dictionaries should be interpreted as having meanings consistent with their meanings within the context of the relevant technology, and will not be interpreted in an idealized or overly formal sense unless explicitly defined herein.

[0051] Hereinafter, a preferred embodiment according to the present invention will be described in detail with reference to the attached drawings.

[0052] FIG. 1 is a conceptual diagram illustrating a wireless communication system according to one embodiment of the present invention.

[0053] Referring to FIG. 1, a wireless communication system (100) may be composed of a plurality of communication nodes (110-1, 110-2, 110-3, 120-1, 120-2, 130-1, 130-2, 130-3, 130-4, 130-5, 130-6).

[0054] Each of the plurality of communication nodes can support at least one communication protocol. For example, each of the plurality of communication nodes can support a communication protocol based on CDMA (Code Division Multiple Access), a communication protocol based on WCDMA (Wideband CDMA), a communication protocol based on TDMA (Time Division Multiple Access), a communication protocol based on FDMA (Frequency Division Multiple Access), a communication protocol based on OFDM (Orthogonal Frequency Division Multiplexing), a communication protocol based on OFDMA (Orthogonal Frequency Division Multiple Access), a communication protocol based on SC (Single Carrier)-FDMA, a communication protocol based on NOMA (Non-Orthogonal Multiple Access), a communication protocol based on SDMA (Space Division Multiple Access), etc.

[0055] A wireless communication system (100) may include a plurality of base stations (110-1, 110-2, 110-3, 120-1, 120-2) and a plurality of user equipments (130-1, 130-2, 130-3, 130-4, 130-5, 130-6).

[0056] The first base station (110-1), the second base station (110-2), and the third base station (110-3) can each form a macro cell. The fourth base station (120-1) and the fifth base station (120-2) can each form a small cell. The fourth base station (120-1), the third terminal (130-3), and the fourth terminal (130-4) can be within the coverage of the first base station (110-1). The second terminal (130-2), the fourth terminal (130-4), and the fifth terminal (130-5) can be within the coverage of the second base station (110-2). The fifth base station (120-2), the fourth terminal (130-4), the fifth terminal (130-5), and the sixth terminal (130-6) may be within the coverage of the third base station (110-3). The first terminal (130-1) may be within the coverage of the fourth base station (120-1). The sixth terminal (130-6) may be within the coverage of the fifth base station (120-2).

[0057] Here, each of the plurality of base stations (110-1, 110-2, 110-3, 120-1, 120-2) may be referred to as a NodeB, an evolved NodeB, a next generation Node B (gNB), a next generation 6G base station, a Base Transceiver Station (BTS), a radio base station, a radio transceiver, an access point, an access node, a road side unit (RSU), a Digital Unit (DU), a Cloud Digital Unit (CDU), a Radio Remote Head (RRH), a Radio Unit (RU), a Transmission Point (TP), a transmission and reception point (TRP), a relay node, etc. Each of the plurality of terminals (130-1, 130-2, 130-3, 130-4, 130-5, 130-6) may be referred to as a terminal, an access terminal, a mobile terminal, a station, a subscriber station, a mobile station, a portable subscriber station, a node, a device, etc.

[0058] Each of the plurality of communication nodes (110-1, 110-2, 110-3, 120-1, 120-2, 130-1, 130-2, 130-3, 130-4, 130-5, 130-6) can support cellular communication (e.g., long term evolution (LTE), advanced LTE-A, New Radio (NR), 6G Radio Access Technology, etc. as specified in the 3rd generation partnership project (3GPP) standard). Each of the plurality of base stations (110-1, 110-2, 110-3, 120-1, 120-2) can operate in a different frequency band or can operate in the same frequency band. Each of the plurality of base stations (110-1, 110-2, 110-3, 120-1, 120-2) can be connected to each other via an ideal backhaul or a non-ideal backhaul, and can exchange information with each other via the ideal backhaul or the non-ideal backhaul. Each of the plurality of base stations (110-1, 110-2, 110-3, 120-1, 120-2) can be connected to a core network (not shown) via an ideal backhaul or a non-ideal backhaul. Each of the plurality of base stations (110-1, 110-2, 110-3, 120-1, 120-2) can transmit a signal received from the core network to the corresponding terminal (130-1, 130-2, 130-3, 130-4, 130-5, 130-6), and can transmit a signal received from the corresponding terminal (130-1, 130-2, 130-3, 130-4, 130-5, 130-6) to the core network.

[0059] Each of the plurality of base stations (110-1, 110-2, 110-3, 120-1, 120-2) can support downlink transmission based on OFDM. In addition, each of the plurality of base stations (110-1, 110-2, 110-3, 120-1, 120-2) can support uplink transmission based on OFDM or DFT-Spread-OFDM. In addition, each of the plurality of base stations (110-1, 110-2, 110-3, 120-1, 120-2) can support MIMO (Multiple Input Multiple Output) transmission (e.g., SU (Single User)-MIMO, MU (Multi User)-MIMO, massive MIMO, etc.), CoMP (Coordinated Multipoint) transmission, carrier aggregation transmission, transmission in an unlicensed band, device to device (D2D) communication (or, ProSe (proximity services), etc.). Here, each of the plurality of terminals (130-1, 130-2, 130-3, 130-4, 130-5, 130-6) can support base stations (110-1, 110-2, 110-3, It is possible to perform operations corresponding to (120-1, 120-2) and / or operations supported by base stations (110-1, 110-2, 110-3, 120-1, 120-2).

[0060] For example, the second base station (110-2) can transmit a signal to the fourth terminal (130-4) based on the SU-MIMO scheme, and the fourth terminal (130-4) can receive a signal from the second base station (110-2) based on the SU-MIMO scheme. Alternatively, the second base station (110-2) can transmit a signal to the fourth terminal (130-4) and the fifth terminal (130-5) based on the MU-MIMO scheme, and each of the fourth terminal (130-4) and the fifth terminal (130-5) can receive a signal from the second base station (110-2) based on the MU-MIMO scheme. Each of the first base station (110-1), the second base station (110-2), and the third base station (110-3) can transmit a signal to the fourth terminal (130-4) based on the CoMP scheme, and the fourth terminal (130-4) can receive a signal from the first base station (110-1), the second base station (110-2), and the third base station (110-3) based on the CoMP scheme. Each of the plurality of base stations (110-1, 110-2, 110-3, 120-1, 120-2) can transmit and receive a signal with terminals (130-1, 130-2, 130-3, 130-4, 130-5, 130-6) within its coverage based on the CA scheme.

[0061] Each of the first base station (110-1), the second base station (110-2), and the third base station (110-3) can coordinate D2D communication between the fourth terminal (130-4) and the fifth terminal (130-5), and each of the fourth terminal (130-4) and the fifth terminal (130-5) can perform D2D communication through coordination by each of the second base station (110-2) and the third base station (110-3).

[0062] Hereinafter, even if a method (e.g., transmitting or receiving a signal) performed by a first communication node among communication nodes is described, a corresponding second communication node can perform a method (e.g., receiving or transmitting a signal) corresponding to the method performed by the first communication node. That is, if an operation of a terminal is described, a corresponding base station can perform an operation corresponding to the operation of the terminal. Conversely, if an operation of a base station is described, a corresponding terminal can perform an operation corresponding to the operation of the base station.

[0063] Also, in the following, downlink (DL) refers to communication from a base station to a terminal, and uplink (UL) refers to communication from a terminal to a base station. In downlink, the transmitter may be part of the base station, and the receiver may be part of the terminal. In uplink, the transmitter may be part of the terminal, and the receiver may be part of the base station.

[0064] Recently, with the rapid proliferation of smartphones and Internet of Things (IoT) devices, the amount of information exchanged via communications networks is increasing. Accordingly, next-generation wireless access technologies need to consider environments that provide faster services to more users than existing communication systems (or existing radio access technologies), such as enhanced mobile broadband communication. To this end, the design of communication systems that consider Machine Type Communication (MTC), which connects multiple devices and objects to provide services, is being discussed. Furthermore, the design of communication systems that consider services and / or terminals sensitive to communication reliability and / or latency (e.g., Ultra-Reliable and Low Latency Communication (URLLC)) is also being discussed.

[0065] Hereinafter, in this specification, for the convenience of explanation, the next-generation wireless access technology is referred to as New RAT (Radio Access Technology), and the wireless communication system to which the New RAT is applied is referred to as an NR (New Radio) system. In this specification, the frequency, frame, subframe, resource, resource block, region, band, subband, control channel, data channel, synchronization signal, various reference signals, various signals, or various messages related to NR may be interpreted as having the meaning used in the past or present, or as having various meanings used in the future.

[0066] FIG. 2 is an exemplary diagram showing an NR system to which a data transmission method according to one embodiment of the present invention can be applied.

[0067] 5G, standardized by 3GPP, is a radio access technology that can provide improved data transmission rates compared to LTE and satisfy various QoS requirements for each segmented and specific usage scenario. In particular, eMBB (enhanced Mobile Broadband), mMTC (massive MTC), and URLLC (Ultra Reliable and Low Latency Communications) are defined as representative usage scenarios of NR. A flexible frame structure compared to LTE is provided as a method to satisfy the requirements of each scenario. The frame structure of 5G NR supports a frame structure based on multiple subcarriers. The default subcarrier spacing (SCS) is 15 kHz, and a total of five SCS types are supported: 15 kHz * 2^n (n = 0, 1, 2, 3, 4).

[0068] Referring to Figure 2, the NG-RAN (Next Generation-Radio Access Network) consists of gNBs that provide NG-RAN user plane (SDAP / PDCP / RLC / MAC / PHY) and control plane (RRC) protocol termination for UE (User Equipment). Here, NG-C represents the control plane interface used for the NG2 reference point between the NG-RAN and the 5th Generation Core (5GC). NG-U represents the user plane interface used for the NG3 reference point between the NG-RAN and the 5GC.

[0069] gNBs are interconnected via the Xn interface and connected to the 5GC via the NG interface. More specifically, gNBs are connected to the Access and Mobility Management Function (AMF) via the NG-C interface and to the User Plane Function (UPF) via the NG-U interface.

[0070] The NR system of FIG. 2 can support multiple numerologies. Here, the numerologies can be defined by subcarrier spacing and cyclic prefix (CP) overhead. Multiple subcarrier spacings can be derived by scaling the basic subcarrier spacing to integers. Furthermore, even if it is assumed that very low subcarrier spacing is not utilized at very high carrier frequencies, the numerologies utilized can be selected independently of the frequency band.

[0071] Additionally, the NR system can support various frame structures according to multiple numerologies.

[0072] Below, the NR waveform, numerology, and frame structure are described.

[0073] NR uses the CP-OFDM waveform with a cyclic prefix for downlink transmission, and CP-OFDM or DFT-S-OFDM for uplink transmission. OFDM technology is easily combined with MIMO (Multiple Input Multiple Output) and offers the advantages of high frequency efficiency and low-complexity receivers.

[0074] Meanwhile, in NR, the requirements for data rates, latency, and coverage differ across the three scenarios mentioned above. Therefore, it is necessary to efficiently satisfy these requirements across the frequency bands that comprise any NR system. To this end, technologies have been proposed to efficiently multiplex radio resources based on multiple different numerologies.

[0075] Specifically, the NR transmission numerator is determined based on the sub-carrier spacing and the cyclic prefix (CP), and is changed exponentially using the μ value as an exponent value of 2 based on 15 kHz, as shown in Table 1 below.

[0076] μSubcarrier spacing (kHz)Cyclic prefixSupported for dataSupported for synch015NormalYesYes130NormalYesYes260Normal, ExtendedYesNo3120NormalYesYes4240NormalNoYes

[0077] As shown in Table 1 above, the numerology of NR can be divided into five types according to the subcarrier spacing. This is different from the fixed 15 kHz subcarrier spacing of LTE, one of the 4G communication technologies. Specifically, the subcarrier spacing used for data transmission in NR is 15, 30, 60, and 120 kHz, and the subcarrier spacing used for synchronization signal transmission is 15, 30, 120, and 240 kHz. In addition, the extended CP is applied only to the 60 kHz subcarrier spacing. Meanwhile, the frame structure in NR is defined as a 10 ms frame consisting of 10 subframes of the same length of 1 ms. One frame can be divided into 5 ms half frames, and each half frame contains 5 subframes. For a 15 kHz subcarrier spacing, one subframe consists of one slot, and each slot consists of 14 OFDM symbols.

[0078] Below, NR physical resources are described.

[0079] In relation to physical resources in NR, antenna ports, resource grids, resource elements, resource blocks, and bandwidth parts are considered.

[0080] Antenna ports are defined such that the channel through which a symbol on an antenna port is carried can be inferred from the channel through which another symbol on the same antenna port is carried. Two antenna ports are said to be quasi co-located (QC / QCL) if the large-scale properties of the channel through which a symbol on one antenna port is carried can be inferred from the channel through which a symbol on the other antenna port is carried. Here, the large-scale properties include one or more of delay spread, Doppler spread, Doppler shift, average delay, and spatial Rx parameters.

[0081] FIG. 3 is a diagram for explaining a resource grid supported by a wireless access technology to which the present invention can be applied.

[0082] Referring to Figure 3, a resource grid may exist for each numeral, as NR supports multiple numerals on the same carrier. Furthermore, resource grids may exist based on antenna ports, subcarrier spacing, and transmission direction.

[0083] A resource block (RB) consists of 12 subcarriers and is defined solely in the frequency domain. Furthermore, a resource element (RE) consists of one OFDM symbol and one subcarrier. Therefore, as shown in Figure 3, the size of a single RB can vary depending on the subcarrier spacing. NR also defines "Point A," which serves as a common reference point for the RB grid, as well as common RBs and physical RBs.

[0084] FIG. 4 is a diagram for explaining a bandwidth part supported by a wireless access technology to which the present invention can be applied.

[0085] Unlike LTE, where the carrier bandwidth is fixed at 20 MHz, NR sets the maximum carrier bandwidth from 50 MHz to 400 MHz for each subcarrier interval. Therefore, it is not assumed that all terminals will use the entire carrier bandwidth. Accordingly, NR allows terminals to designate bandwidth parts (BWPs) within the carrier bandwidth, as illustrated in Figure 4. Furthermore, bandwidth parts are associated with a single numerology, consist of a subset of consecutive common resource blocks, and can be dynamically activated over time. Each terminal is configured with up to four bandwidth parts for both the uplink and downlink, and data is transmitted and received using the bandwidth parts activated at a given time.

[0086] In the case of a paired spectrum, the uplink and downlink bandwidth parts are set independently, and in the case of an unpaired spectrum, the downlink and uplink bandwidth parts are set in pairs so that they can share a center frequency to prevent unnecessary frequency re-tuning between downlink and uplink operations.

[0087] Below, the initial connection to NR is described.

[0088] In NR, a terminal performs cell search and random access procedures to connect to a base station and perform communication.

[0089] Cell search is a procedure in which a terminal synchronizes to the cell of a corresponding base station, obtains a physical layer cell ID, and obtains system information using a synchronization signal block (SSB) transmitted by the base station.

[0090] FIG. 5 is a diagram illustrating an example of a synchronization signal block in a wireless access technology to which the present invention can be applied.

[0091] Referring to FIG. 5, SSB is composed of a Primary Synchronization Signal (PSS) and a Secondary Synchronization Signal (SSS), each occupying one symbol and 127 subcarriers, and a PBCH spanning three OFDM symbols and 240 subcarriers.

[0092] The terminal receives SSB by monitoring SSB in the time and frequency domain.

[0093] SSB can be transmitted up to 64 times in 5ms. Multiple SSBs are transmitted in different transmission beams within 5ms, and the terminal performs detection assuming that SSBs are transmitted every 20ms based on a specific beam used for transmission. The number of beams that can be used for SSB transmission within 5ms can increase as the frequency band increases. For example, up to 4 SSB beams can be transmitted below 3GHz, up to 8 in the frequency band between 3GHz and 6GHz, and up to 64 different beams can be used for SSB transmission in the frequency band above 6GHz.

[0094] SSB contains two symbols in one slot, and the starting symbol and number of repetitions within the slot are determined as follows depending on the subcarrier spacing.

[0095] Meanwhile, unlike SS in conventional LTE, SSB is not transmitted at the center frequency of the carrier bandwidth. This means that SSB can be transmitted even in locations other than the center of the system bandwidth, and when supporting wideband operation, multiple SSBs can be transmitted in the frequency domain. Accordingly, the terminal monitors SSB using the synchronization raster, which is a candidate frequency location for monitoring SSB. The carrier raster, which is the center frequency location information of the channel for initial access, and the synchronization raster are newly defined in NR. The synchronization raster has a wider frequency interval than the carrier raster, which can support the terminal's fast SSB search.

[0096] A UE can obtain the MIB through the PBCH of the SSB. The MIB (Master Information Block) includes the minimum information required for the UE to receive the remaining system information (RMSI, Remaining Minimum System Information, or SIB1 (System Information Block 1)) broadcast by the network. In addition, the PBCH may include information on the position of the first DM-RS (demodulation reference signal) symbol in the time domain, information for the UE to monitor SIB1 (e.g., SIB1 numerology information, information related to SIB1 CORESET, search space information, PDCCH (physical downlink control channel) related parameter information, etc.), offset information between the common resource block and the SSB (the absolute position of the SSB within the carrier is transmitted through SIB1), etc. Here, the SIB1 numerology information is also applied equally to some messages used in the random access procedure for the UE to access the base station after completing the cell search procedure. For example, the numerology information of SIB1 may be applied to at least one of messages 1 to 4 for a random access procedure.

[0097] The aforementioned RMSI may refer to SIB1 (System Information Block 1), and SIB1 is broadcast periodically (e.g., every 160 ms) in the cell. SIB1 contains information necessary for the UE to perform the initial random access procedure and is periodically transmitted via PDSCH. In order for the UE to receive SIB1, it must receive numerology information used for SIB1 transmission and CORESET (Control Resource Set) information used for SIB1 scheduling via PBCH. The UE checks the scheduling information for SIB1 using SI-RNTI (Radio Network Temporary Identifier) ​​within CORESET and acquires SIB1 on PDSCH according to the scheduling information. The remaining SIBs, excluding SIB1, may be transmitted periodically or upon request of the UE.

[0098] Below, a network-controlled repeater (NCR) is described.

[0099] Coverage is a fundamental aspect of cellular network deployment. Mobile operators rely on different types of network nodes to provide uniform coverage during deployment. While deploying standard full-stack cells is an option, it may not always be feasible (e.g., due to unavailability of backhaul) or economically viable.

[0100] One way to improve coverage is to use relay nodes. Relay nodes can receive signals from a base station or a Transmission and Reception Point (TRP) and forward them to a terminal, or conversely, receive signals from a terminal and forward them to a base station or a TRP. The received signal of the relay node can be amplified or beamformed and then retransmitted to the other node, thereby expanding the signal's coverage. Relay nodes can be classified into various types depending on their function. An amplify-and-forward (AF) relay can simply amplify the received signal and retransmit it. An AF relay can be referred to as an L1 (layer 1) relay or a repeater. A decode-and-forward (DF) relay can decode the received signal to receive data and then re-encode and transmit it. DF relays can include L2 (layer 2) relays and L3 (layer 3) relays. An integrated access and backhaul (IAB) node can be functionally classified as an L3 relay.

[0101] Among the relay node types listed above, repeaters have a simple structure and operation, allowing for low-cost production and delivering high efficiency relative to the investment. Basic repeaters typically do not distinguish between uplink and downlink and may not perform beamforming. However, to maximize coverage expansion, it may be desirable for repeaters to support beamforming.

[0102] As a result, new types of network nodes have been considered to increase the flexibility of mobile operators' network construction. For example, Integrated Access and Backhaul (IAB) has been introduced, strengthening a new type of network node that does not require wired backhaul. Another type of network node is the Radio Frequency (RF) repeater, which simply amplifies and forwards all the signals it receives. RF repeaters have been widely deployed in various wireless communication systems to supplement the coverage provided by conventional full-stack cells. In NR, RF and electromagnetic compatibility (EMC) requirements for RF repeaters targeting both FR1 and FR2 have been specified.

[0103] RF repeaters offer a cost-effective means of extending network coverage, but they have limitations. They simply perform amplify-and-forward (AF) operation, failing to consider various factors that could enhance performance. These factors may include information about semi-static and / or dynamic downlink / uplink configurations, adaptive transceiver spatial beamforming, and ON-OFF states.

[0104] A network-controlled repeater (NCR) is an enhancement to conventional RF repeaters, capable of receiving and processing side control information from the network. Side control information, or auxiliary control information, can enable the NCR to perform AF operations more efficiently. Potential benefits include mitigation of unnecessary noise amplification, improved spatial directivity for transmission and reception, and simplified network integration.

[0105] Figure 6 illustrates an example conceptual model of a network control relay.

[0106] The network control relay can be modeled as shown in Figure 6, including NCR-MT (Mobile Termination) and NCR-Fwd (Forwarding). NCR-MT can be defined as a functional entity that communicates with the base station / gNB via the C-link (Control Link) to enable information exchange (e.g., side control information for NCR-Fwd control). The C-link can be based on the NR Uu interface.

[0107] NCR-Fwd can be defined as a functional entity that performs AF operations for UL / DL RF signals between the gNB and the terminal via the backhaul link and access link. The operation of NCR-Fwd can be controlled based on side control information received from the gNB.

[0108] NCR-MT performs communication between the base station and the NCR. The control link is a link formed between the base station and the NCR-MT, and performs the configuration and control of the NCR's access link and / or backhaul link. The backhaul link is a link formed between the NCR-Fwd and the base station, and a signal transmitted from the base station to the terminal through this link can be transmitted and amplified by the NCR-Fwd, and a signal received from the terminal to the NCR-Fwd can be amplified and transmitted to the base station through this link. The access link is a link formed between the NCR-Fwd and the terminal / UE, and a signal between the base station and the UE can be amplified through this link.

[0109] For example, in NCR, the access link of NCR-Fwd can be turned on / off implicitly. For example, when resources are allocated for a specific beam, the operation / procedure can implicitly instruct to turn on the access link. Furthermore, when an error / failure occurs in the NCR-Fwd link due to reasons such as a radio link failure (RLF) with the base station, the operation / procedure can implicitly instruct to turn off the link.

[0110] With respect to network energy saving, the DRX operation of the terminal may be considered. The DRX cycle of the terminal may utilize an active mode for data exchange processing and an inactive sleep mode. The terminal may utilize the active mode for processing at defined intervals to perform measurements related to network conditions or to transmit and receive signals / channels. The period during which the terminal may be scheduled to receive may be referred to as an on period or DRX active time for the DRX cycle. If an on period is not scheduled during the DRX cycle, the terminal may utilize the inactive sleep mode and have the opportunity to save power. This period may be referred to as a DRX inactive time or an off period.

[0111] Technologies currently being discussed for network energy conservation include turning cells on and off in the time domain, reducing the number of MIMO layers (Multiple-Input and Multiple-Output layers) in the spatial domain, and reducing the power intensity of data channels in the power domain. Furthermore, a technology is being considered in which base station equipment adjusts the transmission and reception bandwidth in the frequency domain to reduce network power consumption. This operation can be referred to as the bandwidth part (BWP) operation of the base station equipment, and can also be referred to as cell-specific BWP.

[0112] For example, a method of controlling a base station by turning it on or off for a specific period of time may be considered, and the method may be named cell DTX / DRX (discontinuous transmission / discontinuous reception). Cell DTX / DRX may utilize on periods during which the base station can transmit / receive signals / channels, and off periods during which the base station can disable some or all types of signal reception / transmission processing and save power. Here, the method may be periodic, i.e., applied periodically, or aperiodically.

[0113] Figure 7 illustrates an example of BWP transition.

[0114] With the introduction of BWP, the RF bandwidth over which a terminal transmits and receives can be adjusted, thereby reducing the transmission and reception power consumption of the terminal. Currently, BWP operation is set and operated in a terminal-specific manner. Referring to Figure 7, the base station can set BWP for each terminal, and BWP switching (or BWP switching) can be performed for each terminal.

[0115] Meanwhile, a method of controlling NCR-Fwd through a MAC CE (Medium Access Control-Control Element) and a method of controlling using a PDCCH scrambled by an NCR-RNTI may be considered. For example, a method supported through a MAC CE may designate a MAC CE for NCR access link beam control as code point 224 in a MAC subheader as shown in Table 2 below, and control a beam through a MAC CE as shown in FIG. 8. FIG. 8 illustrates an example of a format of a MAC CE for beam control of an NCR access link. Table 2 illustrates an example of an eLCID (extended Logical Channel ID) of a MAC CE for NCR access link beam control. In Fig. 8, the resource set ID indicates a period and duration in time, A / D indicates activation / deactivation, and the beam ID indicates the index of the beam to be controlled in the access link.

[0116] CodepointIndexLCID values0~22364~287Reserved224288NCR access link beam indication MAC CE225289NCR downlink backhaul link beam indication MAC CE226290NCR uplink backhaul link beam indication MAC CE227291Serving cell set based SRS TCI state indication MAC CE228292SP / AP SRS TCI state indication MAC CE229293BFD-RS indication MAC CE230294Differential Koffset2312951 Octet C i Enhanced SCell activation / deactivation MAC CE with one octet C field i field)2322964 octet C i Enhanced SCell activation / deactivation MAC CE with one octet C field i field)

[0117] As another example, NCR-Fwd can also be aperiodically controlled via a PDCCH (e.g., DCI format 2_8) scrambled with NCR-RNTI. The DCI / PDCCH has beam index information and information about time resources (e.g., time resource ID, etc.). Here, when a time resource ID is used, a list of time resource IDs can be provided together with the resource ID via RRC signaling, and due to limitations in the size of information that can be transmitted via PDCCH, specific IDs within the list can be provided via DCI / PDCCH.

[0118] Below, the methods proposed in this specification are described. Specifically, the following proposes a technique for achieving network energy savings by applying BWP operation to NCR access links, in relation to cell-specific BWP technology, which is considered a network energy-saving technology.

[0119] For example, a method of transmitting a command for BWP transition through a MAC CE (medium access control control element) may be considered.

[0120] Figure 9 is a flowchart illustrating an example of controlling BWP switching via MAC CE according to one embodiment of the present disclosure. While Figure 9 illustrates a single NCR-MT, the example of Figure 9 can be applied to multiple NCR-MTs. The base station of Figure 9 may include a gNB, an eNB, and a base station supporting a next-generation wireless communication system.

[0121] Referring to FIG. 9, the NCR-MT may transmit capability information to the base station (S910). Here, the capability information may include information on the BWP granularity supported by the NCR. For example, when the base station adjusts the BWP, information on the BWP granularity may be used to distinguish / determine the BWP supported by the NCR-MT for the NCR access link. For example, information on the bandwidth for each BWP that can be divided the least (or the BWP that can have the largest bandwidth) may be included in the capability information.

[0122] The base station may transmit configuration information to the NCR-MT (S920). Here, the configuration information may be transmitted via RRC signaling. For example, the configuration information may be transmitted via an RRC reconfiguration message. The configuration information may include at least one of the following pieces of information:

[0123] - Information about the Radio Network Temporary Identifier (RNTI) used for messages instructing the NCR to control the access link: A newly defined RNTI may be considered for messages / channels / signals received by the NCR for control of the NCR access link. This specification names the RNTI as NCR-G-RNTI. The RNTI is an RNTI used for signaling to multiple NCR-MTs within a cell, and the RNTI may be used for scrambling the PDCCH and / or PDSCH.

[0124] - Information about the BWP list: The information refers to a list of BWPs used for the NCR access link. The information may be used to adjust the BWP of the NCR according to the cell-specific BWP operation of the serving base station. For example, the information may include information about an index / indicator indicating a BWP. As another example, the information may include information about the bandwidth of a BWP included in the BWP list. As another example, the information may include information about the offset of a BWP included in the BWP list, i.e., information about the frequency position where the BWP included in the BWP list starts. As another example, the information may include information about a BWP resource ID / configuration, i.e., information indicating a resource for a slot (or other time-domain unit resource) in the time domain. Specifically, the information about the BWP resource ID / configuration may include an ID / identifier for indicating information about a time-domain resource. Here, the information about the time-domain resource may include information about a period, a duration, a slot position within a subframe, etc.

[0125] - Information about the beam list: The above information refers to a list of beams used by the NCR in the access link. For example, the above information can be used when the BWP settings are different for each beam.

[0126] The base station can perform a BWP transition (S930). Here, the base station can change the cell-specific BWP. At this time, a BWP transition for the NCR access link may be required according to the change.

[0127] The base station may transmit a PDCCH to the NCR-MT (S940). Here, the PDCCH may be scrambled based on the NCR-G-RNTI. At this time, the NCR-MT may obtain information about the NCR-G-RNTI through the initial access procedure or step S920. The PDCCH may include information about the radio resource through which the MAC CE containing control information related to BWP switching is transmitted.

[0128] The base station may transmit a MAC CE to the NCR-MT. Here, the MAC CE may be transmitted via a PDSCH. In addition, the MAC CE may include control information related to BWP switching. For example, the MAC CE may be a MAC CE for a BWP switching command for an NCR access link. Here, the MAC CE may include at least one of the following components.

[0129] - eLCID: The MAC CE may be newly defined control information. In this case, the MAC CE may be indicated based on the newly defined eLCID. For example, the newly defined eLCID may be defined as shown in Table 3 below. However, the newly defined eLCID may be defined differently from Table 3 below.

[0130] CodepointIndexLCID values0~22264~286Reserved223287NCR access link BWP switching MAC CE224288NCR access link beam indication MAC CE225289NCR downlink backhaul link beam indication MAC CE226290NCR uplink backhaul link beam indication MAC CE227291Serving cell set based SRS TCI state indication MAC CE228292SP / AP SRS TCI state indication MAC CE229293BFD-RS indication MAC CE230294Differential Koffset2312951 Octet C i Enhanced SCell activation / deactivation MAC CE with one octet C field i field)2322964 octet C i Enhanced SCell activation / deactivation MAC CE with one octet C field i field)

[0131] - BWP Switch Command / Instruction: The MAC CE may include a BWP switch command. Here, as an example, the BWP switch command may include information on the index of the beam that performs the BWP switch. As another example, the BWP switch command may include a BWP resource index, i.e., an index for a BWP to be switched for the BWP switch (i.e., an index for a BWP to be switched). Here, the mapping between the BWP resource and the index for the BWP may be established through RRC signaling, such as an RRC reconfiguration message. As another example, the BWP switch command may include information on a time resource on which the BWP switch is performed. Here, the information on the time resource may include at least one of a periodic time resource, an aperiodic time resource, and a semi-static time resource on which the BWP switch operation is performed. In addition, in the case of a cell-specific BWP, since multiple communication devices may be synchronized to perform the BWP switch, information on a timer for the switching point may be included in the information.

[0132] NCR-MT can perform BWP transition based on the above MAC CE (S960).

[0133] For example, the BWP of the NCR access link may include a cell-specific BWP. The base station may adjust the BWP of the NCR access link so that it is not smaller than the cell-specific BWP of the base station based on the granularity that can be supported for the NCR access link. FIG. 10 illustrates an example in which BWP adjustment is performed according to the frequency band location and bandwidth of the cell-specific BWP of the gNB and the BWP of the NCR access link. The “X” mark in FIG. 10 illustrates an example in which BWP switching is not performed according to an embodiment of the present disclosure, and the “O” mark illustrates an example in which BWP switching is performed according to an embodiment of the present disclosure.

[0134] As another example, a method of transmitting a command for BWP switching via PDCCH may be considered.

[0135] Figure 11 is a flowchart illustrating an example of controlling BWP switching via PDCCH according to one embodiment of the present disclosure. While Figure 11 illustrates a single NCR-MT, the example of Figure 11 can be applied to multiple NCR-MTs. The base station of Figure 11 may include a gNB, an eNB, and a base station supporting a next-generation wireless communication system.

[0136] Referring to FIG. 11, the NCR-MT may transmit capability information to the base station (S1110). Here, the capability information may include information on the BWP granularity supported by the NCR. For example, when the base station adjusts the BWP, information on the BWP granularity may be used to distinguish / determine the BWP supported by the NCR-MT for the NCR access link. For example, information on the bandwidth for each BWP that can be divided the least (or the BWP that can have the largest bandwidth) may be included in the capability information.

[0137] The base station may transmit configuration information to the NCR-MT (S1120). Here, the configuration information may be transmitted via RRC signaling. For example, the configuration information may be transmitted via an RRC reconfiguration message. The configuration information may include at least one of the following pieces of information:

[0138] - Information about the RNTI (Radio Network Temporary Identifier) ​​used for the PDCCH that instructs the NCR to perform BWP control of the access link: A newly defined RNTI may be considered for the message / channel / signal that the NCR receives for the control of the NCR access link. As an example, an RNTI used for signaling to one NCR-MT in a cell may be considered. This specification names the RNTI as NCR-BWP-RNTI. As another example, an RNTI used for signaling to multiple NCR-MTs in a cell may be considered. This specification names the RNTI as NCR-G-BWP-RNTI. The RNTIs may be used for scrambling the PDCCH that instructs BWP switching in the cell.

[0139] - Information about the BWP list: The information refers to a list of BWPs used for the NCR access link. The information may be used to adjust the BWP of the NCR according to the cell-specific BWP operation of the serving base station. For example, the information may include information about an index / indicator indicating a BWP. As another example, the information may include information about the bandwidth of a BWP included in the BWP list. As another example, the information may include information about the offset of a BWP included in the BWP list, i.e., information about the frequency position where the BWP included in the BWP list starts. As another example, the information may include information about a BWP resource ID / configuration, i.e., information indicating a resource for a slot (or other time-domain unit resource) in the time domain. Specifically, the information about the BWP resource ID / configuration may include an ID / identifier for indicating information about a time-domain resource. Here, the information about the time-domain resource may include information about a period, a duration, a slot position within a subframe, etc.

[0140] - Information about the beam list: The above information refers to a list of beams used by the NCR in the access link. For example, the above information can be used when the BWP settings are different for each beam.

[0141] The base station can perform a BWP transition (S1130). Here, the base station can change the cell-specific BWP. At this time, a BWP transition for the NCR access link may be required according to the change.

[0142] The base station can transmit a PDCCH to the NCR-MT (S1140). Here, the PDCCH can be scrambled based on the NCR-BWP-RNTI and / or the NCR-G-BWP-RNTI. At this time, the NCR-MT can obtain information about the NCR-BWP-RNTI and / or the NCR-G-BWP-RNTI through the step S1120. Here, as an example, the configuration information can indicate a radio resource (e.g., a radio resource through which DCI (downlink control information) for BWP switching / control is transmitted), and DCI including BWP switching / control information can be transmitted from the base station to the NCR-MT through the radio resource.

[0143] Here, the DCI may include at least one of the following components.

[0144] - Information about beam index: The DCI may include an index indicating a beam on which BWP switching is performed.

[0145] - Information about BWP index: The DCI may include an index indicating the BWP to be switched, i.e., the BWP that is the target of the BWP transition.

[0146] - C(Cell)-RNTI: For example, different beams and BWPs can be set for each NCR-MT. Information on separate beam indexes / BWP indices can be included for each C-RNTI of the NCR-MT.

[0147] - Information about time resources: This information may indicate resources corresponding to the time at which the BWP changes. For example, this resource may be a periodic time resource. In another example, in the case of cell-specific BWPs, multiple terminals may synchronize and perform BWP switching. In this case, information about a timer for the BWP switching time may be included in this information.

[0148] For example, the BWP of an NCR access link may include a cell-specific BWP. The base station may adjust the BWP of the NCR access link to be no smaller than the cell-specific BWP of the base station based on the granularity supported for the NCR access link. As an example of such adjustment, the example of FIG. 10 may be considered.

[0149] NCR-MT can perform BWP switching based on the above PDCCH (S1150).

[0150] Meanwhile, signal strength degradation can occur due to various factors, such as device failure or inclement weather. In such cases, NCR signal strength reduction compensation is required. Increasing power to compensate for NCR signal strength may necessitate handover parameter compensation due to the increased signal strength of the corresponding cell.

[0151] Below, other methods proposed in this specification are described. Specifically, the following proposes a method for improving cell quality by compensating for signal strength of an NCR access link when signal strength is weakened, and for compensating handover parameters by transmitting relevant information to neighboring cells when such compensation occurs.

[0152] For example, a method of controlling power through MAC CE can be considered.

[0153] FIG. 12 is a flowchart illustrating an example of controlling power of an NCR access link via a MAC CE according to one embodiment of the present disclosure. While FIG. 12 illustrates a single NCR-MT, the example of FIG. 12 can be applied to multiple NCR-MTs. The base station of FIG. 12 may include a gNB, an eNB, and a base station supporting a next-generation wireless communication system. While FIG. 12 illustrates a single neighboring base station, the example of FIG. 12 can be applied to multiple neighboring base stations.

[0154] Referring to FIG. 12, the NCR-MT may transmit capability information to the base station (S1210). Here, the capability information may include information on the maximum power level of the NCR-MT, i.e., information on the maximum power level that the NCR-MT can support. Here, the information on the maximum power level may indicate the maximum power level for the access link of the NCR-Fwd. The information on the maximum power level may be used to determine the power of the NCR-Fwd access link to be set by the base station. For example, the base station may determine / adjust the power level while leaving a margin of power to increase the transmission power in a situation where signal attenuation occurs.

[0155] The base station may transmit configuration information to the NCR-MT (S1220). Here, the configuration information may be transmitted via RRC signaling, such as an RRC reconfiguration message. Additionally, the configuration information may include at least some of the following information:

[0156] - Information on RNTI for performing power control: The base station can signal an RNTI (Radio Network Temporary Identifier) ​​value used for message transmission that enables NCR-Fwd to perform control of the access link. In this specification, the RNTI value is named NCR-G-RNTI. The RNTI value is an RNTI used for signaling multiple NCR-MTs in a cell and can be used for scrambling signaling messages such as PDCCH and PDSCH. Meanwhile, in order to perform power control, activation / deactivation of functions, etc., the NCR-G-RNTI can be an RNTI for controlling an NCR group including one or more NCRs. In the example of FIG. 12, when there are multiple NCR-MTs and the multiple NCR-MTs are included in one NCR group, the NCR-G-RNTI can be used to control the NCR group.

[0157] - Information on the initial access link transmission power: The base station can set the initial power level used by the NCR-Fwd for access link transmission. For example, if the frequency characteristics are highly linear or are significantly affected by air quality / rain, etc., the base station can set the initial power level of the NCR-Fwd transmission power to be lower than the maximum power level to supplement coverage.

[0158] - Information about the band list: When NCR-Fwd uses multiple frequency bands, the power level may be set differently for each frequency band because the frequency characteristics may differ for each band. For example, the information about the band list may include an indicator (Band Index) indicating a specific band, and the frequency band location and bandwidth matching the indicator.

[0159] - Information on Fwd resource ID / configuration: The above information refers to resources for slots in the time domain (or resource units in the time domain, such as symbols), and may be configured with an identifier (or ID) for indicating information on resources in the corresponding time domain. Here, the Fwd resource may refer to resources allocated for NCR-Fwd. For example, the information may include information on period, duration, and slots within a subframe.

[0160] - Information about the beam list: The information about the beam list refers to information related to the beam list used by NCR-Fwd in the access link. For example, initial power, resources, etc. may differ for each beam. For example, the information about the beam list may include an indicator (Beam Index) indicating a specific beam and initial power, resources, etc. matching the indicator.

[0161] Referring to Figure 12, situations may arise where an increase or decrease in the transmission power of the NCR-MT is required, and / or signal strength adjustments are required. For example, after the NCR-MT and the base station exchange capability and configuration information, a situation may arise where signal strength decreases. Examples of situations where signal strength decreases include situations such as snow or rain, the construction of a new building, or the holding of a gathering.

[0162] When the above signal strength reduction situation occurs or when a situation requiring power control of the NCR-MT occurs, the base station can transmit a PDCCH to the NCR-MT (S1230). Here, the PDCCH can be scrambled by the NCR-G (group)-RNTI. At this time, the NCR-G-RNTI can be acquired by the NCR-MT through step S1220 or an initial access procedure. The PDCCH can indicate a radio resource (e.g., a radio resource through which a MAC CE for a power control command is transmitted), and a MAC CE including power control information can be transmitted from the base station to the NCR-MT through the radio resource.

[0163] The base station may transmit a MAC CE via the radio resources indicated by the PDCCH (S1240). Here, the MAC CE may be a MAC CE for a power control command, and the MAC CE may be transmitted while being included in the PDSCH. The MAC CE may include at least one of the following components.

[0164] - eLCID: The MAC CE may be newly defined control information. In this case, the MAC CE may be indicated based on the newly defined eLCID. For example, the newly defined eLCID may be defined as shown in Table 4 below. However, the newly defined eLCID may be defined differently from Table 4 below.

[0165] CodepointIndexLCID values0~22264~286Reserved223287NCR access link power control MAC CE224288NCR access link beam indication MAC CE225289NCR downlink backhaul link beam indication MAC CE226290NCR uplink backhaul link beam indication MAC CE227291Serving cell set based SRS TCI state indication MAC CE228292SP / AP SRS TCI state indication MAC CE229293BFD-RS indication MAC CE230294Differential Koffset2312951 Octet C i Enhanced SCell activation / deactivation MAC CE with one octet C field i field)2322964 octet C i Enhanced SCell activation / deactivation MAC CE with one octet C field i field)

[0166] - Power control command: The MAC CE may include a power control command. For example, when the access link of NCR-Fwd uses multiple frequency bands, the power control command may include an index of a frequency band on which power control is performed. As another example, the power control command may include an index of a beam on which power control is performed. As another example, the power control command may include a power value to be modified based on the power control. Specifically, the power control command may indicate the transmission power to be changed as an absolute value. In this case, the absolute value may be indicated based on a dBm unit. Alternatively, the power control command may indicate the transmission power to be changed as a relative value with respect to the current transmission power value. For example, the relative value may include a value such as 3dB, which doubles the transmission power value, or -3dB, which multiplies the transmission power value by 0.5.

[0167] The NCR-MT may transmit a response MAC CE to the base station (S1250). The response MAC CE may be transmitted in a PUSCH. Here, as an example, in response to the MAC CE including a power increase command by a specific value through step S1240, the response MAC CE may include information or an indicator indicating that the power has been increased by the specific value. Alternatively, in response to the MAC CE including a power increase command by a specific value through step S1240, the response MAC CE may include information or an indicator indicating that the power has been increased by a value other than the specific value, or information about the other value. Here, when the NCR-MT increases the power by a value other than the specific value, the power increase by the other value may be related to an increase in the transmission power of the backhaul link of the NCR-Fwd. Therefore, the information included in the response MAC CE described above may be transmitted to the base station and used for power control / adjustment of the uplink and downlink of the NCR. The above response MAC CE may include at least one of the following components:

[0168] - eLCID: The above response MAC CE may be newly defined control information. In this case, the response MAC CE may be indicated based on the newly defined eLCID. For example, the newly defined eLCID may be defined as shown in Table 5 below. However, the newly defined eLCID may be defined differently from Table 5 below.

[0169] CodepointIndexLCID values0~22164~285Reserved222286NCR access link power control response MAC CE223287NCR access link power control MAC CE224288NCR access link beam indication MAC CE225289NCR downlink backhaul link beam indication MAC CE226290NCR uplink backhaul link beam indication MAC CE227291Serving cell set based SRS TCI state indication MAC CE228292SP / AP SRS TCI state indication MAC CE CE)229293BFD-RS indication MAC CE(BFD-RS indication MAC CE)230294Differential Koffset2312951 Octet C i Enhanced SCell activation / deactivation MAC CE with one octet C field i field)2322964 octet C i Enhanced SCell activation / deactivation MAC CE with one octet C field i field)

[0170] - Power control command: The response MAC CE may include a power control command. For example, when the access link of NCR-Fwd uses multiple frequency bands, the power control command may include an index of a frequency band on which power control is performed. As another example, the power control command may include an index of a beam on which power control is performed. As another example, the power control command may include a power value modified based on the power control. Specifically, the power control command may indicate the modified transmission power as an absolute value. In this case, the absolute value may be indicated based on a dBm unit. Alternatively, the power control command may indicate the modified transmission power as a relative value with respect to the current transmission power value. Alternatively, when the transmission power is not changed, the power control command may include an indicator indicating that there is no change in the transmission power, or may include information indicating a value indicating 0 dB.

[0171] A base station may transmit NCR power control report information to a neighboring base station (S1260). Here, the NCR power control report information may include at least some of an NCR identifier, a frequency index, a beam index of the NCR-MT, and a power control value. Here, the base station or NCR may transmit information about amplified or reduced power through a beam indicated by the beam index of the NCR-MT. A neighboring base station that receives the information may perform actions such as modifying handover parameters.

[0172] The example of FIG. 12 illustrates a method for a MAC CE scrambled via NCR-G-RNTI. However, the example of FIG. 12 can also be applied to a MAC CE scrambled by an RNTI other than NCR-G-RNTI (e.g., C(Cell)-RNTI, etc.). For example, in the example of FIG. 12, a PDCCH transmitted to control one NCR can be scrambled by C-RNTI.

[0173] As another example, a method of controlling power via PDCCH / DCI may be considered.

[0174] FIG. 13 is a flowchart illustrating an example of controlling power of an NCR access link via a PDCCH according to one embodiment of the present disclosure. While FIG. 13 illustrates a single NCR-MT, the example of FIG. 13 can be applied to multiple NCR-MTs. The base station of FIG. 13 may include a gNB, an eNB, and a base station supporting a next-generation wireless communication system. While FIG. 13 illustrates a single neighboring base station, the example of FIG. 13 can be applied to multiple neighboring base stations.

[0175] Referring to FIG. 13, the NCR-MT may transmit capability information to the base station (S1310). Here, the capability information may include information on the maximum power level of the NCR-MT, i.e., information on the maximum power level that the NCR-MT can support. Here, the information on the maximum power level may indicate the maximum power level for the access link of the NCR-Fwd. The information on the maximum power level may be used to determine the power of the NCR-Fwd access link to be set by the base station. For example, the base station may determine / adjust the power level while leaving a margin of power for increasing the transmission power in a situation where signal attenuation occurs.

[0176] The base station may transmit configuration information to the NCR-MT (S1320). Here, the configuration information may be transmitted via RRC signaling, such as an RRC reconfiguration message. Additionally, the configuration information may include at least some of the following information:

[0177] - Information on RNTI for performing power control: The base station can signal an RNTI (Radio Network Temporary Identifier) ​​value used for transmitting a PDCCH that enables NCR-Fwd to perform power control of an access link. In this specification, the RNTI value is named as NCR-TPC (transmit power control)-RNTI. The RNTI value can be used to scramble a PDCCH for power control. Here, the RNTI used for scrambling a PDCCH for controlling an NCR group including multiple NCRs can be defined separately from the NCR-TPC-RNTI. In this specification, the RNTI value is named as NCR-G-TPC-RNTI. In an example of FIG. 13, when there are multiple NCR-MTs and the multiple NCR-MTs are included in one NCR group, the NCR-G-TPC-RNTI can be used when scrambling a PDCCH for controlling the NCR group.

[0178] - Information on the initial access link transmission power: The base station can set the initial power level used by the NCR-Fwd for access link transmission. For example, if the frequency characteristics are highly linear or are significantly affected by air quality / rain, etc., the base station can set the initial power level of the NCR-Fwd transmission power to be lower than the maximum power level to supplement coverage.

[0179] - Information on Fwd resource ID / configuration: The above information refers to resources for slots in the time domain (or resource units in the time domain, such as symbols), and may be configured with an identifier (or ID) for indicating information on resources in the corresponding time domain. Here, the Fwd resource may refer to resources allocated for NCR-Fwd. For example, the information may include information on period, duration, and slots within a subframe.

[0180] - Information about the beam list: The information about the beam list refers to information related to the beam list used by NCR-Fwd in the access link. For example, initial power, resources, etc. may differ for each beam. For example, the information about the beam list may include an indicator (Beam Index) indicating a specific beam and initial power, resources, etc. matching the indicator.

[0181] Referring to Figure 13, situations may arise where an increase or decrease in the transmission power of the NCR-MT is required, and / or signal strength adjustments are required. For example, after the NCR-MT and the base station exchange capability and configuration information, a situation may arise where signal strength decreases. Examples of situations where signal strength decreases include situations such as snow or rain, the construction of a new building, or the holding of a gathering.

[0182] When the above signal strength reduction situation occurs or when a situation requiring power control of the NCR-MT occurs, the base station can transmit a PDCCH to the NCR-MT (S1330). Here, the PDCCH can be scrambled by the NCR-TPC-RNTI or NCR-G-TPC-RNTI. At this time, the NCR-TPC-RNTI or NCR-G-TPC-RNTI can be acquired by the NCR-MT through step S1320. Here, as an example, the configuration information can indicate a radio resource (e.g., a radio resource through which DCI (downlink control information) for power control is transmitted), and DCI including power control information can be transmitted from the base station to the NCR-MT through the radio resource.

[0183] Here, the DCI may include at least one of the following components.

[0184] - Information about beam index: DCI may include information about a beam index indicating the beam on which power control is performed.

[0185] - Power Control Value: The DCI may include a power value that is modified based on power control. Specifically, the DCI may indicate the transmission power to be changed as a relative value to the current transmission power value. In this case, the relative value may be indicated based on the dBm unit. Alternatively, if the current transmission power value is maintained through power control, the DCI may include an indicator indicating that the transmission power is not modified.

[0186] - Information about C-RNTI: Different beam indices and power control values ​​can be set for each NCR-MT. Therefore, information about separate beam indices and / or power control values ​​can be included for each C-RNTI value of the NCR-MT.

[0187] The NCR-MT may transmit a response MAC CE to the base station (S1340). The response MAC CE may be transmitted in a PUSCH. Here, as an example, in response to a DCI / PDCCH including a power increase command by a specific value through step S1330, the response MAC CE may include information or an indicator indicating that the power has been increased by the specific value. Alternatively, in response to a DCI / PDCCH including a power increase command by a specific value through step S1330, the response MAC CE may include information or an indicator indicating that the power has been increased by a value other than the specific value, or information about the other value. Here, when the NCR-MT increases the power by a value other than the specific value, the power increase by the other value may be related to an increase in the transmission power of the backhaul link of the NCR-Fwd. Accordingly, the information contained in the aforementioned response MAC CE can be transmitted to the base station and used for power control / adjustment of the uplink and downlink of the NCR. The response MAC CE can include at least one of the following components.

[0188] - eLCID: The above response MAC CE may be newly defined control information. In this case, the response MAC CE may be indicated based on the newly defined eLCID. For example, the newly defined eLCID may be defined as shown in Table 5. However, the newly defined eLCID may be defined differently from Table 5.

[0189] - Power control command: The response MAC CE may include a power control command. For example, the power control command may include an index of a beam on which power control is performed. As another example, the power control command may include a power value modified based on the power control. Specifically, the power control command may indicate the modified transmission power as an absolute value. In this case, the absolute value may be indicated based on a dBm unit. Alternatively, the power control command may indicate the modified transmission power as a relative value with respect to the current transmission power value. Alternatively, when the transmission power is not changed, the power control command may include an indicator indicating that there is no change in the transmission power, or may include information indicating a value indicating 0 dB.

[0190] A base station can transmit NCR power control report information to a neighboring base station (S1350). Here, the NCR power control report information can include at least some of an NCR identifier, a frequency index, a beam index of the NCR-MT, and a power control value. Here, the base station or NCR can transmit information about amplified or reduced power through a beam indicated by the beam index of the NCR-MT. A neighboring base station that receives the information can perform actions such as modifying handover parameters.

[0191] Below, positioning or location determination is described.

[0192] Positioning is a technology that estimates a location through the angle of a signal, signal strength, and difference in arrival time of a signal based on measurements of downlink PRS (Positioning Reference Signal), uplink SRS (Sounding Reference Signal), SSB (Synchronization Signal Block), and CSI-RS (Channel State Information-Reference Signal) RRM (Radio Resource Measurement) (e.g., RSRP, RSRQ, etc.) signals. As an example of a positioning method, at least some of the following methods may be used. However, the positioning method is not limited to the methods described below.

[0193] - NR Enhanced Cell ID: Estimates the location of the terminal based on RSRP, RSRQ measurements at the SSB / CSI-RS level or cell level, or based on the reception angle of the uplink signal and the TA (Timing advance) value.

[0194] - Multi-RTT: Estimate the location of the terminal based on the difference in reception-transmission time between the downlink PRS and uplink SRS in multiple cells.

[0195] - DL-AoD: Estimate position by measuring the intensity of the PRS received for each beam where the beam angle is known.

[0196] - DL-TDOA: Estimate location by measuring the difference in arrival times of downlink PRSs at various cells and cell sites.

[0197] - UL-RTOA: Estimate location by measuring the difference in arrival times of uplink SRSs across different cells and cell sites.

[0198] - UL-AoA: Estimate location by measuring the azimuth and zenith of arrival of the terminal's uplink SRS signal.

[0199] FIG. 14 illustrates an example of a positioning service provision procedure to which embodiments of the present specification can be applied.

[0200] Referring to FIG. 14, some entities of the 5GC, such as the Gateway Mobile Location Center (GMLC), may request location services, such as positioning, for a target terminal (UE) from the serving AMF (S1410a). Alternatively, the serving AMF for the target terminal may determine the need for location services, such as finding the location of the UE for an emergency call (S1410b). Alternatively, the terminal may request location services, such as positioning or transfer of auxiliary data, from the serving AMF at the non-access stratum (NAS) level (S1410c). Here, at least one of steps S1410a, S1410b, and S1410c may be performed.

[0201] Based on the above steps S1410a, S1410b or S1410c, the AMF transmits a location service request to the LMF (Location Management Function) (S1420). Thereafter, the LMF may perform a location-related procedure (herein referred to as an NG-RAN node procedure) with an NG-RAN node, e.g., a serving base station of the NG-RAN or a neighboring base station, for example, to obtain location positioning measurements and / or assistance data (S1430a). In addition, the LMF may perform a location-related procedure (herein referred to as a terminal procedure) with a terminal, for example, to obtain location estimation, location positioning measurements or transmit location assistance data to the terminal (S1430b). Here, at least one of the steps S1430a and S1430b may be performed.

[0202] The LMF transmits a location service response to the AMF (S1440). The location service response may include at least one of the results of the NG-RAN node procedure and the results of the terminal procedure. For example, the location service response may include a success or failure indication for the request in step S1420, and a location estimate (if requested or acquired) of the terminal.

[0203] Afterwards, if step S1410a is performed, the AMF returns a location service response to the 5GC entity of step S1410a (S1450a). Here, the location service response may include necessary results, such as location estimation for the terminal.

[0204] Additionally, if step S1410b is performed, the AMF supports the service triggered in step S1410b using the location service response received in step S1440 (S1450b). In step S1450b, for example, a location estimate related to an emergency call to GMLC may be provided.

[0205] Additionally, if step S1410c is performed, the AMF returns a location service response to the terminal (S1450c). Here, the location service response may include a location estimate for the terminal.

[0206] When a location service entity, AMF, or terminal requests location services, the AMF notifies the LMF that location services have been requested, and the base station and / or terminal may perform measurements for positioning based on the selected positioning method. The base station and / or terminal may provide the LMF with information necessary for positioning, and the LMF may perform location calculations and estimations based on that information.

[0207] At this time, LPP (LTE Positioning Protocol) may be used when transmitting information between the terminal and LMF, and NRPPa (NR Positioning Protocol A) may be used when transmitting information between the base station and LMF. For example, information transmitted through LPP may include measurement results or position estimates of the terminal, while NRPPa may include measurement results of the base station, PCI (Physical Cell ID), TRP (Transmission / Reception Point) position and configuration information, etc.

[0208] Performing positioning requires accurate measurements and base station configuration information. When an RF repeater is used, the base station cannot determine which signals were amplified and transmitted. Consequently, location estimation based on measurement results can be inaccurate. However, with the introduction of NCRs, which operate under base station control, the base station can determine which signals were transmitted via the NCR, and this information can be used to differentiate measurements.

[0209] Below, various technical features proposed in this specification for improving positioning accuracy by utilizing NCR information are described. The technical features described below can be combined and applied within a range of non-interference.

[0210] While the technical features described below are based on the NR system, they can also be applied to next-generation wireless communication systems other than NR systems, or existing wireless communication systems such as LTE. For example, with respect to the technical features described below, the base station may include a gNB, an eNB, and a base station of a next-generation wireless communication system.

[0211] Furthermore, while the technical features described below are based on a new type of repeater or relay, such as the NCR, the technical features described below can also be applied to IAB nodes, terminals, and communication devices capable of performing relay functions. Furthermore, for convenience, the term "relay" in this specification may be replaced with "relay."

[0212] Hereinafter, the technical features proposed in this specification and drawings illustrating the technical features are described. Each of the drawings described below is an example, and the technical features proposed in this specification are not limited by the drawings described below. Furthermore, it is obvious to those skilled in the art that at least two or more of the various technical features described below can be combined within a compatible range, and therefore, the technical features derived from such combinations also fall within the scope of the disclosure of this specification.

[0213] For example, when determining position considering NCR, at least some of the following information may be used. Here, the above information may be provided to the LMF and utilized for position estimation.

[0214] 1. Beam index

[0215] The base station can use side control information to configure the beam index to be used by the NCR. Based on this information, the base station can determine whether the measurement result value reported by the terminal was measured based on the signal received via the NCR.

[0216] FIG. 15 is a diagram illustrating an example of a positioning method considering a beam index to which embodiments of the present specification can be applied. Referring to FIG. 15, if a base station is configured to AF (Amplify-and-Forward) an RF signal for beam #N for NCR, and a measurement result value reported by a terminal (e.g., RSRP, RSRQ, etc.) includes a result value for beam #N, it can be known that the base station measured based on a signal AFted through NCR. Accordingly, when positioning, it is possible to check whether NCR is applied through the beam index, and to perform position estimation by considering the angle, intensity, arrival time, etc. of the signal when NCR is applied.

[0217] 2. Location of NCR

[0218] A base station can obtain location information about an NCR upon initial connection. If a terminal is serviced through an NCR (e.g., a terminal transmits and receives signals through an NCR), the terminal's location can be calculated by additionally considering NCR location information.

[0219] 3. NCR processing time

[0220] The base station may have information about the NCR's processing time upon initial connection. Based on this information, when a terminal is serviced via NCR (e.g., when a terminal transmits and receives signals via NCR), the terminal's location can be estimated by calculating the signal arrival time, taking into account the NCR's processing time.

[0221] For example, the information transmitted by the base station to the LMF may be as shown in the following table. In Table 6 below, some information may be omitted.

[0222]

[0223] Below, procedures for positioning considering NCR are proposed. Here, the above information can be provided to the LMF through at least some of the procedures described below and utilized for position estimation.

[0224] FIG. 16 illustrates an example of a positioning procedure according to one embodiment of the present specification.

[0225] Referring to FIG. 16, some entities of the 5GC, such as the Gateway Mobile Location Center (GMLC), may request location services, such as positioning, for a target terminal (UE) from the serving AMF (S1610a). Alternatively, the serving AMF for the target terminal may determine the need for location services, such as finding the location of the UE for an emergency call (S1610b). Alternatively, the terminal may request location services, such as positioning or transmitting auxiliary data, from the serving AMF at the non-access stratum (NAS) level (S1610c). Here, at least one of steps S1610a, S1610b, and S1610c may be performed. That is, a location service request may be triggered by the terminal, the AMF, or the location service entity.

[0226] Based on the above steps S1610a, S1610b or S1610c, the AMF transmits a location service request to the LMF (Location Management Function) (S1620). Thereafter, the LMF may perform a location-related procedure (in this specification, the procedure is referred to as a terminal procedure) with the terminal, for example, obtaining a location estimation, a location positioning measurement or transmitting location assistance data to the terminal (S1630). The terminal procedure may include operations such as measurement for location positioning and transmission of the measurement result value. For example, when a location service is requested, the terminal or NG-RAN node (or base station) may perform a measurement necessary for location positioning according to a positioning method, and the terminal or base station may provide the measurement result value to the LMF through LPP or NRPPa. At this time, the base station may determine whether NCR is applied based on the beam information of the measurement result. If the base station determines that NCR is applied based on beam information of the measurement result, i.e., if NCR is associated with signal reception and / or measurement related to positioning of the terminal, the base station can provide NCR information (e.g., beam index, position of NCR, processing time, etc.) to the LMF via NRPPa.

[0227] The LMF determines the location of the terminal based on the terminal procedure (S1640). For example, the LMF can calculate the terminal location based on the received measurement results and NCR information. For example, the LMF can calculate the terminal location by synthesizing the NCR location information, processing time information, and measurement results received from other base stations. At this time, the LMF can estimate which base station the terminal is close to based on the signal strength, signal arrival time, and signal angle according to the base station location, and calculate the terminal location by considering the measurement results of the RF signal transmitted through the NCR and the NCR location.

[0228] FIG. 17 illustrates another example of a positioning procedure according to one embodiment of the present specification.

[0229] Referring to FIG. 17, some entities of the 5GC, such as the Gateway Mobile Location Center (GMLC), may request location services, such as positioning, for a target terminal (UE) from the serving AMF (S1710a). Alternatively, the serving AMF for the target terminal may determine the need for location services, such as finding the location of the UE for an emergency call (S1710b). Alternatively, the terminal may request location services, such as positioning or transmitting auxiliary data, from the serving AMF at the non-access stratum (NAS) level (S1710c). Here, at least one of steps S1710a, S1710b, and S1710c may be performed. That is, a location service request may be triggered by the terminal, the AMF, or the location service entity.

[0230] Based on the above steps S1710a, S1710b or S1710c, the AMF transmits a location service request to the LMF (Location Management Function) (S1720). Thereafter, the LMF may perform a location-related procedure (in this specification, the procedure is referred to as a terminal procedure) with the terminal, for example, obtaining a location estimation, a location positioning measurement or transmitting location assistance data to the terminal (S1730). The terminal procedure may include operations such as measurement for location positioning and transmission of the measurement result value. For example, when a location service is requested, the terminal or NG-RAN node (or base station) may perform a measurement necessary for location positioning according to a positioning method, and the terminal or base station may provide the measurement result value to the LMF through LPP or NRPPa. At this time, the base station may determine whether NCR is applied based on the beam information of the measurement result.

[0231] If the base station determines that NCR has been applied based on beam information of the measurement results, the base station determines whether to update the NCR (S1740). Step S1740 may be a step for determining whether information about the applied NCR has changed. For example, in step S1740, the base station may determine that the NCR has been updated when the beam index of the NCR configured by the base station has changed.

[0232] If the base station determines that the NCR has been updated, the base station transmits NCR-related information to the LMF (S1750). At this time, the NCR-related information may include only updated information. For example, if information about the NCR has already been provided to the LMF and the information has not changed, the base station may provide only information about the identifier or index for the NCR. As another example, if information about the NCR has already been provided to the LMF but beam information of the NCR has changed, the base station may provide the updated beam information together with the NCR index. As another example, if it is determined to be a new NCR, i.e., if it is determined that the NCR has changed, the base station may provide beam information, location information, and processing time information for the NCR together with the NCR index. In other words, if, before receiving the NCR information, the communication device receives at least one of the location of the NCR, the beam index of the NCR, and the processing time of the NCR from the base station, the NCR information may include only changed information, i.e., updated information, among the location of the NCR, the beam index of the NCR, and the processing time of the NCR.

[0233] The LMF determines the location of the terminal based on terminal procedure and NCR-related information (S1760). For example, the LMF can calculate the terminal location based on the received measurement results and NCR information. For example, the LMF can calculate the terminal location by synthesizing the NCR location information, processing time information, and measurement results received from other base stations. At this time, the LMF can estimate which base station the terminal is close to based on the signal strength, signal arrival time, and signal angle according to the base station location, and calculate the terminal location by considering the measurement results of the RF signal transmitted through the NCR and the NCR location.

[0234] Figure 18 is a flowchart illustrating an example of a positioning method according to one embodiment of the present specification. Here, the method is performed by a communication device, and the communication device includes a device having a positioning function or a device performing positioning processing.

[0235] Referring to FIG. 18, a communication device receives NCR information from a base station (S1810). Here, the NCR information may indicate at least one of the location of an NCR related to an NCR controlled by the base station, a beam index of the NCR, and a processing time of the NCR. Since a specific description of the NCR information has been described above, a redundant description will be omitted.

[0236] The communication device performs positioning of the terminal based on the NCR information (S1820). Here, the communication device can determine that NCR has been used when the terminal transmits and receives signals for positioning based on the NCR information, and can reflect / consider this when performing positioning. In addition, the terminal may be a terminal connected to the base station, a terminal managed by the base station, or a terminal camped on a cell managed by the base station.

[0237] Although not shown in FIG. 18, the communication device may transmit the positioning results to a terminal, a base station, and / or another entity.

[0238] Figure 19 illustrates a terminal and network node implementing an embodiment of the present specification. The terminal of Figure 19 may include a user device and / or an NCR. Additionally, the network node of Figure 19 may include an NCR.

[0239] Referring to FIG. 19, the terminal (1000) includes a processor (1010), a memory (1020), and a transceiver (1030). The processor (1010) may be configured to implement the functions, processes, and / or methods described herein. Layers of the wireless interface protocol may be implemented in the processor (1010).

[0240] The memory (1020) is connected to the processor (1010) and stores various information for driving the processor (1010). The transceiver (1030) is connected to the processor (1010) and transmits a wireless signal to a network node (1050) or receives a wireless signal from the network node (1050).

[0241] The network node (1050) includes a processor (1060), a memory (1070), and a transceiver (1080). In the present embodiment, the network node (1050) is a node of a non-terrestrial network and may include an artificial satellite performing a wireless access procedure according to the present specification. Alternatively, the network node (1050) in the present embodiment may be a node of a terrestrial network and may include a base station performing a wireless access procedure according to the present specification.

[0242] The processor (1060) may be configured to implement the functions, processes, and / or methods described herein. Layers of a wireless interface protocol may be implemented in the processor (1060). A memory (1070) is connected to the processor (1060) and stores various information for driving the processor (1060). A transceiver (1080) is connected to the processor (1060) and transmits a wireless signal to the terminal (1000) or receives a wireless signal from the terminal (1000).

[0243] The processor (1010, 1060) may include an application-specific integrated circuit (ASIC), other chipsets, logic circuits, and / or data processing devices. The memory (1020, 1070) may include a read-only memory (ROM), a random access memory (RAM), flash memory, a memory card, a storage medium, and / or other storage devices. The transceiver (1030, 1080) may include a baseband circuit for processing radio frequency signals. When the embodiment is implemented in software, the above-described technique may be implemented as a module (process, function, etc.) that performs the above-described function. The module may be stored in the memory (1020, 1070) and executed by the processor (1010, 1060). The memory (1020, 1070) may be internal or external to the processor (1010, 1060) and may be connected to the processor (1010, 1060) by various well-known means.

[0244] In the exemplary system described above, methods that can be implemented according to the features of the present invention have been described based on a flowchart. For convenience, the methods have been described as a series of steps or blocks. However, the claimed features of the present invention are not limited to the order of the steps or blocks, and some steps may occur in a different order or simultaneously with other steps than described above. Furthermore, those skilled in the art will understand that the steps depicted in the flowchart are not exclusive, and other steps may be included, or one or more steps in the flowchart may be deleted without affecting the scope of the present invention.

[0245] The claims set forth in this specification may be combined in various ways. For example, the technical features of the method claims of this specification may be combined to implement a device, and the technical features of the device claims of this specification may be combined to implement a method. Furthermore, the technical features of the method claims and the technical features of the device claims of this specification may be combined to implement a device, and the technical features of the method claims and the technical features of the device claims of this specification may be combined to implement a method. Furthermore, the embodiments set forth in this specification may be combined as long as they are not mutually incompatible.

Claims

1. A method performed by a network-controlled repeater (NCR) in a wireless communication system, Transmit capability information to a base station, wherein the capability information includes BWP capability information for a bandwidth part (BWP) supported by the NCR for an access link between the NCR and a terminal transmitting and receiving data with the NCR, Receive configuration information from the base station, wherein the configuration information includes BWP configuration information for the access link, Receive control information from the base station, wherein the control information includes BWP switching information for the access link, and A method characterized in that BWP switching for the access link is performed based on the above control information.

2. In paragraph 1, The above control information includes first control information and second control information, The above first control information is transmitted through the first PDCCH (physical downlink control channel), The above second control information is transmitted through a MAC CE (medium access control control element), and A method characterized in that the BWP switching information is included in the second control information.

3. In paragraph 2, A method characterized in that the first control information indicates a resource to which the second control information is allocated.

4. In paragraph 2, The above first PDCCH is scrambled based on a first RNTI (Radio Network Temporary Identifier) ​​defined for controlling the NCR, A method characterized in that the first RNTI is indicated through the setting information.

5. In paragraph 1, The bandwidth of the target BWP for which the above NCR performs the above BWP switching is greater than or equal to the bandwidth of the cell specific BWP set for the above base station, A method characterized in that the above BWP capability information indicates the granularity for BWP supported by the NCR for the access link.

6. In paragraph 1, A method characterized in that the BWP switching information includes at least one of information about a target BWP of the BWP switching, information about a beam on which the BWP switching is performed, and information about a time domain resource on which the BWP switching is performed.

7. In paragraph 6, A method characterized in that the information about the time domain resource includes at least one of information about the period and duration for the BWP transition.

8. In paragraph 1, The above control information is transmitted through the second PDCCH, Based on the above BWP switching information being information only for the NCR, the second PDCCH is scrambled based on the second RNTI, A method characterized in that the second PDCCH is scrambled based on a third RNTI, based on the above BWP switching information being information for a plurality of NCRs including the NCR.

9. In paragraph 1, The above capability information indicates the maximum power level for the access link between the NCR and the terminal transmitting and receiving data with the NCR, The above configuration information indicates the initial power level for the access link, The above control information includes power control information related to the transmission power of the NCR for the access link, The above NCR transmits response information for the control information to the above base station, The power control information includes first information about a target transmission power value of the NCR for the access link, A method characterized in that the response information includes second information about an actual transmission power value of the NCR for the access link.

10. Network-controlled repeater (NCR) One or more memories that store instructions; one or more transmitters and receivers; and One or more processors connecting the one or more memories and the one or more transceivers, wherein the one or more processors execute the instructions, Transmit capability information to a base station, wherein the capability information includes BWP capability information for a bandwidth part (BWP) supported by the NCR for an access link between the NCR and a terminal transmitting and receiving data with the NCR, Receive configuration information from the base station, wherein the configuration information includes BWP configuration information for the access link, Receive control information from the base station, wherein the control information includes BWP switching information for the access link, and A device characterized in that it performs BWP switching for the access link based on the above control information.

11. In paragraph 10, The above control information includes first control information and second control information, The above first control information is transmitted through the first PDCCH (physical downlink control channel), The above second control information is transmitted through a MAC CE (medium access control control element), and A device characterized in that the BWP switching information is included in the second control information.

12. In paragraph 10, The above control information is transmitted through the second PDCCH, Based on the above BWP switching information being information only for the NCR, the second PDCCH is scrambled based on the second RNTI, A device characterized in that the second PDCCH is scrambled based on a third RNTI, based on the above BWP switching information being information for a plurality of NCRs including the NCR.

13. In paragraph 10, A device characterized in that the above BWP capability information indicates the granularity for BWP supported by the NCR for the access link.

14. In paragraph 10, The above capability information indicates the maximum power level for the access link between the NCR and the terminal transmitting and receiving data with the NCR, The above configuration information indicates the initial power level for the access link, The above control information includes power control information related to the transmission power of the NCR for the access link, The above NCR transmits response information for the control information to the above base station, The power control information includes first information about a target transmission power value of the NCR for the access link, A device characterized in that the response information includes second information about an actual transmission power value of the NCR for the access link.

15. At least one computer-readable recording medium containing instructions based on being executed by at least one processor included in a network-controlled repeater (NCR), A base station configured to transmit capability information, wherein the capability information includes BWP capability information for a bandwidth part (BWP) supported by the NCR for an access link between the NCR and a terminal transmitting and receiving data with the NCR, configured to receive setup information from the base station, wherein the setup information includes BWP setup information for the access link; configured to receive control information from the base station, wherein the control information includes BWP switching information for the access link, and A recording medium characterized in that it is configured to perform BWP switching for the access link based on the above control information.

16. In paragraph 15, The above control information includes first control information and second control information, The above first control information is transmitted through the first PDCCH (physical downlink control channel), The above second control information is transmitted through a MAC CE (medium access control control element), and A recording medium characterized in that the BWP conversion information is included in the second control information.

17. In paragraph 15, The above control information is transmitted through the second PDCCH, Based on the above BWP switching information being information only for the NCR, the second PDCCH is scrambled based on the second RNTI, A recording medium characterized in that the second PDCCH is scrambled based on a third RNTI, based on the above BWP switching information being information for a plurality of NCRs including the NCR.

18. In paragraph 15, The above BWP capability information indicates the granularity for BWP supported by the NCR for the above access link, The bandwidth of the target BWP of the above BWP switching is recorded in a medium that is greater than or equal to the bandwidth of the cell specific BWP set for the base station.

19. In paragraph 15, A recording medium characterized in that the BWP switching information includes at least one of information about a target BWP of the BWP switching, information about a beam on which the BWP switching is performed, and information about a time domain resource on which the BWP switching is performed.

20. In paragraph 15, The above capability information indicates the maximum power level for the access link between the NCR and the terminal transmitting and receiving data with the NCR, The above configuration information indicates the initial power level for the access link, The above control information includes power control information related to the transmission power of the NCR for the access link, The above processor transmits response information for the control information to the above base station, The power control information includes first information about a target transmission power value of the NCR for the access link, A recording medium characterized in that the response information includes second information about an actual transmission power value of the NCR for the access link.

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