Method and device for controlling downlink reference signal transmission power

Abstract

The present disclosure relates to a technique for calculating transmission power for a downlink reference signal, and provides a method and a device, the method comprising the steps of: receiving, by a terminal, a channel state information reference signal from a base station in an SBFD symbol or a non-SBFD symbol; and calculating transmission power for the channel state information reference signal by applying at least one of first power control offset information and second power control offset information with reference to synchronization signal block transmission power information.

Description

Downlink reference signal transmission power control method and device

[0001] The present disclosure relates to a technique for calculating transmission power for a downlink reference signal.

[0002] TDD (Time Division Duplex) is a duplexing method widely used in 5G mobile communication systems. In TDD, time-slot radio resources are divided into downlink and uplink slots. Typically, downlink slots are distributed at a higher rate than uplink slots, depending on the distribution ratio of uplink to downlink traffic. However, this limitation on uplink slots negatively impacts coverage and latency. Full duplex has recently attracted attention as a technology to address these issues.

[0003] Full duplex is a technology that performs transmission and reception simultaneously using the same time and frequency resources, and can be applied in the form of performing DL transmission and UL reception simultaneously on the base station (gNB in ​​the case of 5G) side or the terminal side.

[0004] However, in this case, interference between downlink and uplink is highly likely. To address this, guard bands are set when downlink and uplink are configured to coexist within a single slot or symbol.

[0005] Downlink reference signals can also be transmitted in slots or symbols where uplink and downlink coexist, and in this case, estimation and control technology for transmission power is required to prevent interference phenomena, etc.

[0006] The present disclosure provides a technology for a terminal to distinguish and calculate the transmission power of a downlink reference signal received at a specific symbol.

[0007] In one aspect, the present embodiments may provide a method for a user equipment (UE) to perform communication through sub band full duplex (SBFD) in a wireless communication system, the method including the steps of receiving a channel state information reference signal in an SBFD symbol or a non-SBFD symbol from a base station and calculating transmission power for the channel state information reference signal by applying at least one of first power control offset information and second power control offset information based on synchronization signal block transmission power information.

[0008] In another aspect, the present embodiments may provide a method for a base station (BS) to perform communication through sub band full duplex (SBFD) in a wireless communication system, the method including: a step of determining transmission power for a channel state information reference signal in an SBFD symbol or a non-SBFD symbol by applying at least one of first power control offset information and second power control offset information based on synchronization signal block transmission power information; and a step of transmitting the channel state information reference signal to a terminal in the SBFD symbol or the non-SBFD symbol with the transmission power.

[0009] In another aspect, the present embodiments may provide a terminal device for performing communication via sub band full duplex (SBFD) in a wireless communication system, the terminal device including a receiving unit that receives a channel state information reference signal in an SBFD symbol or a non-SBFD symbol from a base station, and a control unit that calculates transmission power for the channel state information reference signal using at least one of first power control offset information and second power control offset information based on synchronization signal block transmission power information.

[0010] In another aspect, the present embodiments can provide a base station (BS) that performs communication through sub band full duplex (SBFD) in a wireless communication system, the base station device including a control unit that determines transmission power for a channel state information reference signal in an SBFD symbol or a non-SBFD symbol by applying at least one of first power control offset information and second power control offset information based on synchronization signal block transmission power information, and a transmission unit that transmits the channel state information reference signal to a terminal in an SBFD symbol or a non-SBFD symbol with the transmission power.

[0011] The present disclosure enables a terminal to distinguish and calculate the transmission power of a downlink reference signal received in a specific symbol.

[0012] FIG. 1 is a diagram schematically illustrating the structure of an NR wireless communication system to which the present embodiment can be applied.

[0013] FIG. 2 is a drawing for explaining a frame structure in an NR system to which the present embodiment can be applied.

[0014] FIG. 3 is a diagram for explaining a resource grid supported by a wireless access technology to which the present embodiment can be applied.

[0015] FIG. 4 is a diagram for explaining a bandwidth part supported by a wireless access technology to which the present embodiment can be applied.

[0016] FIG. 5 is a diagram illustrating an example of a synchronization signal block in a wireless access technology to which the present embodiment can be applied.

[0017] FIG. 6 is a diagram for explaining a random access procedure in a wireless access technology to which the present embodiment can be applied.

[0018] Figure 7 is a drawing for explaining CORESET.

[0019] FIG. 8 is a diagram for explaining an example in which a UL subband is set in any DL slot to which the present embodiment can be applied.

[0020] Figure 9 is a drawing for explaining terminal operation according to one embodiment.

[0021] Fig. 10 is a diagram for explaining base station operation according to one embodiment.

[0022] Fig. 11 is a drawing showing the configuration of a terminal according to one embodiment.

[0023] Fig. 12 is a diagram showing the configuration of a base station according to one embodiment.

[0024] Hereinafter, some embodiments of the present disclosure will be described in detail with reference to exemplary drawings. When adding reference numerals to components in each drawing, identical components may have the same numerals as much as possible even if they are shown in different drawings. In addition, when describing the present embodiments, if it is determined that a detailed description of a related known configuration or function may obscure the gist of the technical idea of ​​the present invention, the detailed description may be omitted. When "includes," "has," "consists of," etc. are used in this specification, other parts may be added unless "only" is used. When a component is expressed in the singular, it may include a case in which the plural is included unless specifically stated otherwise.

[0025] Additionally, terms such as first, second, A, B, (a), (b), etc. may be used to describe components of the present disclosure. These terms are only intended to distinguish the components from other components, and the nature, order, sequence, or number of the components are not limited by the terms.

[0026] In a description of the positional relationship of components, when it is described that two or more components are "connected," "combined," or "connected," it should be understood that the two or more components may be directly "connected," "combined," or "connected," but that the two or more components may also be further "interposed" with another component to be "connected," "combined," or "connected." Here, the other component may be included in one or more of the two or more components that are "connected," "combined," or "connected" to each other.

[0027] In the description of the temporal flow relationship related to components, operation methods, or manufacturing methods, for example, when the temporal or flow relationship is described as “after”, “following”, “next to”, “before”, etc., it may also include cases where it is not continuous, unless “immediately” or “directly” is used.

[0028] Meanwhile, when numerical values ​​or corresponding information (e.g., levels, etc.) for components are mentioned, even without separate explicit description, the numerical values ​​or corresponding information may be interpreted as including an error range that may occur due to various factors (e.g., process factors, internal or external impact, noise, etc.).

[0029] The wireless communication system in this specification refers to a system for providing various communication services such as voice, data packets, etc. using wireless resources, and may include a terminal, a base station, or a core network.

[0030] The embodiments disclosed below can be applied to wireless communication systems using various wireless access technologies. For example, the embodiments can be applied to various wireless access technologies such as CDMA (code division multiple access), FDMA (frequency division multiple access), TDMA (time division multiple access), OFDMA (orthogonal frequency division multiple access), SC-FDMA (single carrier frequency division multiple access), or NOMA (non-orthogonal multiple access). In addition, the wireless access technology may not only refer to a specific access technology, but also to each generation of communication technologies established by various communication agreement organizations such as 3GPP, 3GPP2, WiFi, Bluetooth, IEEE, and ITU. For example, CDMA can be implemented with wireless technologies such as UTRA (universal terrestrial radio access) or CDMA2000. TDMA can be implemented with wireless technologies such as GSM (global system for mobile communications) / GPRS (general packet radio service) / EDGE (enhanced data rates for GSM evolution). OFDMA can be implemented in wireless technologies such as IEEE (Institute of Electrical and Electronics Engineers) 802.11 (Wi-Fi), IEEE 802.16 (WiMAX), IEEE 802-20, and E-UTRA (evolved UTRA). IEEE 802.16m is an evolution of IEEE 802.16e and provides backward compatibility with systems based on IEEE 802.16e.UTRA is part of UMTS (universal mobile telecommunications system). 3GPP (3rd generation partnership project) LTE (long term evolution) is part of E-UMTS (evolved UMTS) that uses E-UTRA (evolved-UMTSterrestrial radio access), employing OFDMA in the downlink and SC-FDMA in the uplink. Thus, the present embodiments can be applied to currently disclosed or commercialized wireless access technologies, as well as wireless access technologies currently under development or to be developed in the future.

[0031] Meanwhile, the term "terminal" in this specification is a comprehensive concept that refers to a device that includes a wireless communication module that performs communication with a base station in a wireless communication system, and should be interpreted as a concept that includes not only UE (User Equipment) in WCDMA, LTE, NR, HSPA, and IMT-2020 (5G or New Radio), but also MS (Mobile Station), UT (User Terminal), SS (Subscriber Station), and wireless device in GSM. In addition, the terminal may be a user portable device such as a smartphone depending on the usage type, and in a V2X communication system, it may mean a vehicle, a device including a wireless communication module in the vehicle, etc. In addition, in the case of a Machine Type Communication system, it may mean an MTC terminal, M2M terminal, URLLC terminal, etc. that is equipped with a communication module to perform machine type communication.

[0032] The base station or cell in this specification refers to an end that communicates with a terminal in terms of a network, and includes various coverage areas such as Node-B, eNB (evolved Node-B), gNB (gNode-B), LPN (Low Power Node), Sector, Site, various types of antennas, BTS (Base Transceiver System), Access Point, Point (e.g., Transmission Point, Reception Point, Transmission / Reception Point), Relay Node, Mega Cell, Macro Cell, Micro Cell, Pico Cell, Femto Cell, RRH (Remote Radio Head), RU (Radio Unit), and Small Cell. In addition, a cell may mean including a BWP (Bandwidth Part) in the frequency domain. For example, a serving cell may mean an Activation BWP of a terminal.

[0033] Since the various cells listed above have a base station that controls one or more cells, the base station can be interpreted in two meanings. 1) It can be a device itself that provides a mega cell, macro cell, micro cell, pico cell, femto cell, or small cell in relation to a wireless area, or 2) it can indicate the wireless area itself. In 1), all devices that provide a given wireless area are controlled by the same entity or that interact to cooperatively configure the wireless area are all indicated as a base station. Depending on how the wireless area is configured, a point, a transceiver point, a transmission point, a reception point, etc. can be an embodiment of a base station. In 2), the wireless area itself that receives or transmits a signal from the perspective of a user terminal or a neighboring base station can also be indicated as a base station.

[0034] In this specification, a cell may mean a component carrier having coverage of a signal transmitted from a transmission / reception point or a transmission / reception point itself.

[0035] Uplink (UL, or uplink) refers to a method of transmitting and receiving data from a terminal to a base station, and downlink (DL, or downlink) refers to a method of transmitting and receiving data from a base station to a terminal. Downlink may refer to communication or a communication path from multiple transmission / reception points to a terminal, and uplink may refer to communication or a communication path from a terminal to multiple transmission / reception points. In this case, in the downlink, the transmitter may be part of the multiple transmission / reception points, and the receiver may be part of the terminal. In addition, in the uplink, the transmitter may be part of the terminal, and the receiver may be part of the multiple transmission / reception points.

[0036] Uplink and downlink transmit and receive control information through control channels such as PDCCH (Physical Downlink Control CHannel) and PUCCH (Physical Uplink Control CHannel), and transmit and receive data by configuring data channels such as PDSCH (Physical Downlink Shared CHannel) and PUSCH (Physical Uplink Shared CHannel). Hereinafter, the situation in which signals are transmitted and received through channels such as PUCCH, PUSCH, PDCCH, and PDSCH is also expressed in the form of 'transmitting and receiving PUCCH, PUSCH, PDCCH, and PDSCH.'

[0037] For clarity of explanation, the technical idea of ​​this invention is described below mainly with reference to the 3GPP LTE / LTE-A / NR (New RAT) communication system, but the technical features of this invention are not limited to the communication system.

[0038] After researching 4G (4th-Generation) communication technology, 3GPP develops 5G (5th-Generation) communication technology to meet the requirements of the next-generation wireless access technology of the ITU-R. Specifically, 3GPP develops LTE-A pro, which is an enhancement of LTE-Advanced technology to meet the requirements of the ITU-R, as a 5G communication technology, and NR, a new communication technology separate from 4G communication technology. Both LTE-A pro and NR refer to 5G communication technology, and in the following, 5G communication technology will be explained with NR as the focus, unless a specific communication technology is specified.

[0039] The operating scenario in NR defines various operation scenarios by adding considerations for satellites, automobiles, and new verticals to the existing 4G LTE scenario, and in terms of service, it supports the eMBB (Enhanced Mobile Broadband) scenario, the mMTC (Massive Machine Communication) scenario that has high terminal density but is deployed over a wide area and requires low data rate and asynchronous access, and the URLLC (Ultra Reliability and Low Latency) scenario that requires high responsiveness and reliability and can support high-speed mobility.

[0040] To meet these scenarios, NR introduces a wireless communication system that incorporates new waveform and frame structure technologies, low latency technologies, support for ultra-high frequency bands (mmWave), and forward compatibility technologies. In particular, NR systems offer various technological changes in terms of flexibility to ensure forward compatibility. The key technical features of NR are described below with reference to the drawings.

[0041] <NR 시스템 일반>

[0042] Figure 1 is a schematic diagram illustrating the structure of an NR system to which the present embodiment can be applied.

[0043] Referring to Fig. 1, the NR system is divided into 5GC (5G Core Network) and NR-RAN parts, and the NG-RAN is composed of gNBs and ng-eNBs that provide user plane (SDAP / PDCP / RLC / MAC / PHY) and control plane (RRC) protocol termination for UE (User Equipment). gNBs or gNBs and ng-eNBs are interconnected via the Xn interface. gNBs and ng-eNBs are each connected to the 5GC via the NG interface. The 5GC can be configured to include an AMF (Access and Mobility Management Function) that is responsible for the control plane such as terminal access and mobility control functions, and an UPF (User Plane Function) that is responsible for the control function for user data. NR includes support for both frequency bands below 6 GHz (FR1, Frequency Range 1) and frequency bands above 6 GHz (FR2, Frequency Range 2).

[0044] gNB refers to a base station that provides NR user plane and control plane protocol termination to terminals, and ng-eNB refers to a base station that provides E-UTRA user plane and control plane protocol termination to terminals. The base station described in this specification should be understood to encompass both gNB and ng-eNB, and may also be used to refer to gNB or ng-eNB separately as needed.

[0045] <NR 웨이브 폼,뉴머롤러지 및 프레임 구조>

[0046] 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 spectral efficiency and low-complexity receivers.

[0047] 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.

[0048] 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.

[0049] μsubcarrier intervalCyclic prefixSupported for dataSupported for synch015NormalYesYes130NormalYesYes260Normal, ExtendedYesNo3120NormalYesYes4240NormalNoYes

[0050] 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. In the case of a 15 kHz subcarrier spacing, one subframe consists of one slot, and each slot consists of 14 OFDM symbols. FIG. 2 is a diagram for explaining the frame structure in an NR system to which the present embodiment can be applied.

[0051] Referring to Fig. 2, a slot is fixedly composed of 14 OFDM symbols in the case of a normal CP, but the length of the slot in the time domain may vary depending on the subcarrier spacing. For example, in the case of a numerology with a 15 kHz subcarrier spacing, a slot is composed of 1 ms in length, which is the same length as a subframe. In contrast, in the case of a numerology with a 30 kHz subcarrier spacing, a slot is composed of 14 OFDM symbols, but two slots may be included in one subframe with a length of 0.5 ms. In other words, subframes and frames are defined with fixed time lengths, while slots are defined by the number of symbols, and their time lengths may vary depending on the subcarrier spacing.

[0052] Meanwhile, NR defines slots as the basic scheduling unit and also introduces mini-slots (or sub-slots, or non-slot-based scheduling) to reduce transmission delay in the wireless section. Using wider subcarrier spacing reduces transmission delay in the wireless section by shortening the length of each slot inversely. Mini-slots (or sub-slots) are designed to efficiently support URLLC scenarios and allow scheduling in units of 2, 4, or 7 symbols.

[0053] Furthermore, unlike LTE, NR defines uplink and downlink resource allocation at the symbol level within a single slot. To reduce HARQ delay, a slot structure was defined that allows HARQ ACK / NACKs to be transmitted directly within the transmission slot. This slot structure is referred to as a self-contained structure and will be described in detail.

[0054] NR is designed to support a total of 256 slot formats, of which 62 are used in 3GPP Rel-15. It also supports a common frame structure that configures FDD or TDD frames through various combinations of slots. For example, it supports a slot structure in which all symbols in a slot are set to downlink, a slot structure in which all symbols are set to uplink, and a slot structure in which downlink and uplink symbols are combined. NR also supports data transmission being distributed and scheduled across one or more slots. Therefore, a base station can use a slot format indicator (SFI) to inform a UE whether a slot is a downlink slot, an uplink slot, or a flexible slot. The base station can indicate the slot format by indicating an index of a table configured through UE-specific RRC signaling using the SFI, and can also indicate it dynamically through DCI (Downlink Control Information) or statically or semi-statically through RRC.

[0055] <NR 물리 자원 >

[0056] In relation to physical resources in NR, antenna ports, resource grids, resource elements, resource blocks, and bandwidth parts are considered.

[0057] 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, frequency shift, average received power, and received timing.

[0058] FIG. 3 is a diagram for explaining a resource grid supported by a wireless access technology to which the present embodiment can be applied.

[0059] 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.

[0060] 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 virtual RBs.

[0061] FIG. 4 is a diagram for explaining a bandwidth part supported by a wireless access technology to which the present embodiment can be applied.

[0062] 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.

[0063] 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.

[0064] <NR 초기 접속>

[0065] In NR, a terminal performs cell search and random access procedures to connect to a base station and perform communication.

[0066] 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 the synchronization signal block (SSB) transmitted by the base station.

[0067] FIG. 5 is a diagram illustrating an example of a synchronization signal block in a wireless access technology to which the present embodiment can be applied.

[0068] Referring to FIG. 5, SSB is composed of a primary synchronization signal (PSS) and a secondary synchronization signal (SSS), each occupying 1 symbol and 127 subcarriers, and a PBCH spanning 3 OFDM symbols and 240 subcarriers.

[0069] The terminal receives SSB by monitoring SSB in the time and frequency domain.

[0070] 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.

[0071] 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.

[0072] 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.

[0073] 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) broadcast by the network. In addition, the PBCH may include information on the position of the first DM-RS 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-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 the random access procedure.

[0074] 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 scheduling information for SIB1 using SI-RNTI in 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.

[0075] FIG. 6 is a diagram for explaining a random access procedure in a wireless access technology to which the present embodiment can be applied.

[0076] Referring to FIG. 6, once cell search is complete, the terminal transmits a random access preamble for random access to the base station. The random access preamble is transmitted via the PRACH. Specifically, the random access preamble is transmitted to the base station via the PRACH, which consists of consecutive radio resources in a specific slot that is periodically repeated. Generally, when a terminal initially accesses a cell, a contention-based random access procedure is performed, and when performing random access for beam failure recovery (BFR), a non-contention-based random access procedure is performed.

[0077] The terminal receives a random access response to the transmitted random access preamble. The random access response may include a random access preamble identifier (ID), an UL Grant (uplink radio resource), a temporary C-RNTI (Temporary Cell - Radio Network Temporary Identifier), and a TAC (Time Alignment Command). Since one random access response may include random access response information for one or more terminals, the random access preamble identifier may be included to indicate which terminal the included UL Grant, temporary C-RNTI, and TAC are valid for. The random access preamble identifier may be an identifier for the random access preamble received by the base station. The TAC may be included as information for the terminal to adjust uplink synchronization. The random access response may be indicated by a random access identifier on the PDCCH, i.e., an RA-RNTI (Random Access - Radio Network Temporary Identifier).

[0078] Upon receiving a valid random access response, the terminal processes the information contained in the random access response and performs scheduled transmission to the base station. For example, the terminal applies TAC and stores a temporary C-RNTI. Furthermore, using the UL Grant, the terminal transmits data stored in its buffer or newly generated data to the base station. In this case, information that identifies the terminal must be included.

[0079] Finally, the terminal receives a downlink message for contention resolution.

[0080] <NR CORESET>

[0081] The downlink control channel in NR is transmitted in a CORESET (Control Resource Set) with a length of 1 to 3 symbols, and transmits uplink / downlink scheduling information, SFI (Slot format Index), and TPC (Transmit Power Control) information.

[0082] To ensure system flexibility, NR introduced the CORESET concept. CORESET (Control Resource Set) refers to time-frequency resources for downlink control signals. A terminal can decode control channel candidates using one or more search spaces within the CORESET time-frequency resources. A QCL (Quasi CoLocation) assumption is established for each CORESET, which is used to inform the characteristics of analog beam direction in addition to the delay spread, Doppler spread, Doppler shift, and average delay assumed by the conventional QCL.

[0083] Figure 7 is a drawing for explaining CORESET.

[0084] Referring to Figure 7, a CORESET can exist in various forms within the carrier bandwidth within a single slot, and in the time domain, a CORESET can consist of up to three OFDM symbols. In addition, a CORESET is defined as a multiple of six resource blocks up to the carrier bandwidth in the frequency domain.

[0085] The first CORESET is indicated via the MIB as part of the initial bandwidth part configuration, allowing the terminal to receive additional configuration and system information from the network. After establishing a connection with the base station, the terminal can receive and configure one or more CORESET information via RRC signaling.

[0086] In this specification, the terms 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 (New Radio) may be interpreted in the past or present meaning or in various meanings used in the future.

[0087]

[0088] Time Division Duplex (TDD) is a duplexing method widely used in commercial New Radio (NR) and 5G mobile communication systems. In TDD, time-slot radio resources are divided into downlink and uplink slots. Typically, downlink slots are distributed at a higher rate than uplink slots, depending on the distribution ratio of uplink to downlink traffic. However, this limitation on uplink slots negatively impacts coverage and latency. Full duplex has recently attracted attention as a technology to address these issues.

[0089] Full duplex is a technology that performs simultaneous transmission and reception using the same time and frequency resources. It is generally applied in the form of simultaneous DL transmission and UL reception on the base station (gNB in ​​the case of 5G). However, it is not limited to this, and simultaneous DL reception and UL transmission can also be performed on the terminal side. In other words, both the base station and the terminal can support full duplex. However, unlike the base station, which is structurally easy to cancel self-interference, the DL reception performance of the terminal is easily affected by self-interference of the UL transmission signal. Therefore, the case where the base station operates in full duplex and the terminal operates in half duplex is generally considered. Additionally, from the base station's perspective, to reduce the impact of self-interference, a subband non-overlapping full duplex method can be considered, which performs DL transmission and UL reception simultaneously while distinguishing the frequency resources for DL ​​and UL transmission and reception.

[0090] FIG. 8 is a diagram for explaining an example in which a UL subband is set in any DL slot to which the present embodiment can be applied.

[0091] Referring to FIG. 8, when a TDD configuration is made in which DL slots and UL slots are in a ratio of 4:1 in an arbitrary NR frequency band (however, some symbols of the last DL slot are special slots including flexible symbols for DL / UL transition), a UL subband may be set to support UL transmission of a terminal in some (or all) of the DL slots.

[0092] For example, when a UL subband is configured for a random DL slot, the UL subband may be configured at the center (810) or edge (820) of the frequency band, and a guard band may be configured between the UL subband and the DL subband in the slot. In addition, frequency resources other than the UL subband and the guard band may be utilized as DL subbands for DL ​​transmission and reception according to existing slot / symbol configuration information.

[0093] When the UL subband is configured around the center of the frequency band, as in 810, two guard bands are configured, one above and one below the UL subband. Similarly, two DL subbands can be configured, one above and one below the UL subband.

[0094] Or, if a UL subband is set at the edge of the frequency band, such as 820, one guard band and one DL subband can be configured following the UL subband.

[0095]

[0096] UL-DL slot configuration can be performed on a cell-by-cell basis through cell-specific RRC signaling. That is, a pattern of DL symbols, UL symbols, and flexible symbols for a certain period is configured in the UE through the RRC message 'tdd-UL-DL-ConfigurationCommon' for the corresponding UL-DL slot configuration. Additionally, only the flexible symbols configured through 'tdd-UL-DL-ConfigurationCommon' can be reallocated to UL symbols, DL symbols, or flexible symbols for each UE through the UE-specific RRC signaling 'tdd-UL-DL-ConfigurationDedicated'. Alternatively, a dynamic slot format indication method through the UE-group common PDCCH can be used. For this purpose, NR supports a dynamic form of slot format indication operation through DCI format 2_0.

[0097] According to the slot configuration method described above, any one symbol can be set or indicated as one of DL, UL, or Flexible. That is, any slot format can be set to DDDSU through slot configuration, as shown in 810 and 820 of FIG. 8. D refers to a downlink slot, meaning that all OFDM symbols constituting the slot are set to DL. U refers to an uplink slot, meaning that all OFDM symbols constituting the slot are set to UL. S refers to a special slot, meaning that a slot includes a flexible symbol for DL / UL transition. Typically, in the case of a normal CP, the special slot can be configured with 12 DL symbols and 2 flexible symbols out of a total of 14 symbols. Alternatively, it can be configured with 10 DL symbols, 2 flexible symbols, and 2 UL symbols. That is, within any one TDD carrier, one symbol is configured or indicated as only one of DL, UL, or flexible.

[0098] However, if a UL subband is configured in an arbitrary DL slot as shown in FIG. 8, DL transmission or UL transmission may occur simultaneously for each frequency resource in the corresponding symbol. In this way, a DL slot or symbol including a UL subband or a UL slot or symbol including a DL subband is referred to as an SBFD (sub band full duplex or subband non-overlapping full duplex) slot or SBFD (sub band full duplex or subband non-overlapping full duplex) symbol. In other words, an SBFD slot or SBFD symbol means a slot or symbol in which DL and UL are configured simultaneously on the frequency axis in the corresponding slot or symbol.

[0099] Hereinafter, a slot composed only of SBFD symbols is referred to as an SBFD slot, and a slot composed only of symbols according to the existing symbol configuration (i.e., a slot composed only of symbols that do not include a UL subband, a DL subband, and a guardband) is referred to as a non-SBFD slot. Alternatively, a slot including at least one SBFD symbol may be referred to as an SBFD slot. These terms may be replaced with other terms.

[0100] When a base station supports subband non-overlapping full duplex, PUSCH transmission can be performed through the UL subband in the SBFD symbol or SBFD slot in which the UL subband is configured as described above. Additionally, downlink-related signals such as PDSCH or CSI-RS can be transmitted through symbols other than the UL subband.

[0101] At this time, the uplink / downlink wireless channel environment between the terminal and the base station in the SBFD symbol may be different from the uplink / downlink wireless channel environment between the terminal and the base station in the existing non-SBFD symbol. In particular, since downlink transmission and uplink reception can occur simultaneously at the base station in the SBFD symbol, the base station's transmit / receive antennas and RF modules need to be operated separately for transmission and reception, respectively. Additionally, in this case, additional wireless signal interference such as self-interference or cross-link interference may occur. Due to this, not only may the uplink wireless channel state from a given terminal to the base station differ between the SBFD symbol and the non-SBFD symbol, but the downlink wireless channel state from the base station to a specific terminal may also differ between the SBFD symbol and the non-SBFD symbol.

[0102] In these embodiments, we propose a technique to additionally compensate for the power difference that may occur when the CSI-RS transmission power offset through a non-SBFD symbol is directly applied to the SBFD symbol, taking this into consideration.

[0103] The embodiments and terminal / base station operations described below may be combined and performed in any combination. Alternatively, the terminal and base station may add or omit certain operations, or change the order of operations, to perform the operations required for each embodiment below.

[0104] Figure 9 is a drawing for explaining terminal operation according to one embodiment.

[0105] Referring to FIG. 9, a method for a user equipment (UE) to perform communication via sub band full duplex (SBFD) in a wireless communication system may include a step of receiving a channel state information reference signal from a base station in an SBFD symbol or a non-SBFD symbol (S910).

[0106] For example, a terminal can receive configuration information for each slot based on TDD slot configuration information. Additionally, the terminal can configure a UL subband or DL ​​subband in a specific slot or symbol for SBFD operation.

[0107]

[0108] *Therefore, the terminal may be configured with SBFD symbols or non-SBFD symbols. The terminal may receive a downlink reference signal in an SBFD symbol or a non-SBFD symbol. For example, the downlink reference signal may be a channel state information reference signal. That is, the downlink reference signal may be a CSI-RS. When the terminal receives a channel state information reference signal in an SBFD symbol or a non-SBFD symbol, it may mean that the symbol includes a CSI-RS resource element.

[0109] The channel state information reference signal can be configured to be periodic or aperiodic, and may be received only through SBFD symbols. Alternatively, the channel state information reference signal may be received in both SBFD and non-SBFD symbols. Similarly, the channel state information reference signal may be received only in non-SBFD symbols.

[0110] As explained above, the transmission power must be calculated differently depending on the symbol settings when the channel state information reference signal is received in an SBFD symbol or a non-SBFD symbol.

[0111] A method for a terminal (user equipment, UE) to perform communication via sub band full duplex (SBFD) in a wireless communication system may include a step of calculating transmission power for a channel state information reference signal by applying at least one of first power control offset information and second power control offset information based on synchronization signal block transmission power information (S920).

[0112] For example, the terminal can calculate the transmission power for the channel state information reference signal by applying at least one of the first power control offset information and the second power control offset information to the synchronization signal block transmission power information. When applying at least one of the first power control offset information and the second power control offset information, the terminal can apply it differently depending on whether the symbol in which the channel state information reference signal is received is an SBFD symbol.

[0113] For example, the terminal can calculate the transmission power for the channel state information reference signal in a non-SBFD symbol by applying the first power control offset information to the synchronization signal block transmission power information. For example, when the CSI-RS is received in a non-SBFD symbol, the terminal can derive the CSI-RS EPRE using the SSB transmission power and the first power control offset information (e.g., powerControlOffsetSS) received through the upper layer signal. The first power control offset information includes information about the difference between the SSB transmission power and the CSI-RS transmission power. There is no limitation on the method by which the terminal applies the first power control offset information to the SSB transmission power.

[0114] As another example, the terminal can calculate the transmission power for the channel state information reference signal in the SBFD symbol by applying the second power control offset information to the synchronization signal block transmission power information. For example, when the CSI-RS is received in the SBFD symbol, the terminal can derive the CSI-RS EPRE using the SSB transmission power and the second power control offset information (e.g., sbfd-powerControlOffsetSS). The second power control offset information includes information about the difference between the SSB transmission power and the CSI-RS transmission power received in the SBFD symbol. There is no limitation on how the terminal applies the second power control offset information to the SSB transmission power.

[0115] In order to calculate the CSI-RS transmission power in the SBFD symbol as above, the second power control offset information is configured in the terminal, and the terminal calculates the transmission power by applying the second power control offset information when the CSI-RS is received in the SBFD symbol. If the CSI-RS is received in a non-SBFD symbol, the terminal can calculate the transmission power by applying the first power control offset information instead of the second power control offset information. That is, the terminal can configure both the first power control offset information and the second power control offset information, and calculate the transmission power by applying the appropriate offset information to the synchronization signal block transmission power according to the symbol in which the channel state information reference signal is received.

[0116] As another example, the terminal can calculate the transmission power for the channel state information reference signal in the SBFD symbol by applying the first power control offset information and the second power control offset information to the synchronization signal block transmission power information. For example, the second power control offset information (e.g., sbfd-powerControlOffset) can include information indicating an offset value for the first power control offset information. Accordingly, when the channel state information reference signal is received in the SBFD symbol, the terminal can calculate the transmission power by applying the first power control offset information based on the synchronization signal block transmission power and additionally applying the second power control offset information thereto. If the channel state information reference signal is received in a non-SBFD symbol, the terminal can calculate the transmission power by applying only the first power control offset information based on the synchronization signal block transmission power.

[0117] In summary, the second power control offset information can be used as a factor for calculating the transmission power of the channel state information reference signal in the SBFD symbol. For example, the second power control offset information can be applied as offset information for application in the SBFD symbol, and can be substituted and applied in parallel with the first power control offset information depending on the symbol. As another example, the second power control offset information is offset information for application in the SBFD symbol, but can include offset information based on the first power control offset information. Therefore, the second power control offset information can be used together with the first power control offset information in the SBFD symbol.

[0118] Meanwhile, the second power control offset information can be configured in the terminal in various ways.

[0119] For example, the second power control offset information may be received through a higher layer message together with the first power control offset information. For example, the second power control offset information may be configured in the terminal through an RRC message. The second power control offset information may be included as a field in the NZP-CSI-RS-Resource information element together with the first power control offset information. However, this is an example and there are no restrictions on the RRC message.

[0120] As another example, the second power control offset information may be preset to a fixed value. In this case, the first power control offset information may be received by the terminal via an RRC message. As an example, the fixed value may be set as an offset value based on the synchronization signal block transmission power information. As another example, the fixed value may be set as an offset value based on the first power control offset information. In each case, the operation of calculating the transmission power for the channel state information reference signal may be applied by replacing it with the first power control offset information, as described above, or may be applied additionally to the first power control offset information.

[0121] Through the above operations, the terminal can differentiate and calculate the transmission power when the channel state information reference signal is received in an SBFD symbol and when it is received in a non-SBFD symbol. Therefore, ambiguity regarding terminal operation in full duplex and errors in the channel state estimation process can be prevented.

[0122] Fig. 10 is a diagram for explaining base station operation according to one embodiment.

[0123] Referring to FIG. 10, a method for a base station (BS) to perform communication via sub band full duplex (SBFD) in a wireless communication system may include a step of determining transmission power for a channel state information reference signal in an SBFD symbol or a non-SBFD symbol by applying at least one of first power control offset information and second power control offset information based on synchronization signal block transmission power information (S1010).

[0124] For example, the base station can determine the transmission power for the channel state information reference signal by applying at least one of the first power control offset information and the second power control offset information to the synchronization signal block transmission power information. When applying at least one of the first power control offset information and the second power control offset information, the base station can apply it differently depending on whether the symbol through which the channel state information reference signal is transmitted is an SBFD symbol.

[0125] For example, the base station can determine the transmission power for the channel state information reference signal in a non-SBFD symbol by applying the first power control offset information to the synchronization signal block transmission power information. For example, when the CSI-RS is transmitted in a non-SBFD symbol, the base station can determine the CSI-RS EPRE using the SSB transmission power and the first power control offset information (e.g., powerControlOffsetSS) transmitted to the terminal. The first power control offset information includes information about the difference between the SSB transmission power and the CSI-RS transmission power.

[0126] As another example, the base station can determine the transmission power for the channel state information reference signal in the SBFD symbol by applying the second power control offset information to the synchronization signal block transmission power information. For example, when the CSI-RS is transmitted in the SBFD symbol, the base station can determine the transmission power of the CSI-RS EPRE using the SSB transmission power and the second power control offset information (e.g., sbfd-powerControlOffsetSS). The second power control offset information includes information about the difference between the SSB transmission power and the CSI-RS transmission power received in the SBFD symbol.

[0127] In order to determine the CSI-RS transmission power in the SBFD symbol as above and allow the terminal to calculate it, second power control offset information is configured in the terminal, and the terminal calculates the transmission power by applying the second power control offset information when the CSI-RS is received in the SBFD symbol. If the CSI-RS is transmitted in a non-SBFD symbol, the base station can determine the transmission power by applying the first power control offset information instead of the second power control offset information. That is, the base station can configure both the first power control offset information and the second power control offset information, and apply the appropriate offset information to the synchronization signal block transmission power according to the symbol in which the channel state information reference signal is transmitted, to determine the transmission power.

[0128] As another example, the base station can determine the transmission power for the channel state information reference signal in the SBFD symbol by applying the first power control offset information and the second power control offset information to the synchronization signal block transmission power information. For example, the second power control offset information (e.g., sbfd-powerControlOffset) can include information indicating an offset value for the first power control offset information. Accordingly, when the channel state information reference signal is transmitted in the SBFD symbol, the base station can determine the transmission power by applying the first power control offset information based on the synchronization signal block transmission power and additionally applying the second power control offset information. If the channel state information reference signal is transmitted in a non-SBFD symbol, the base station can determine the transmission power by applying only the first power control offset information based on the synchronization signal block transmission power.

[0129] In summary, the second power control offset information can be used as a factor for calculating the transmission power of the channel state information reference signal in the SBFD symbol. For example, the second power control offset information can be applied as offset information for application in the SBFD symbol, and can be substituted and applied in parallel with the first power control offset information depending on the symbol. As another example, the second power control offset information is offset information for application in the SBFD symbol, but can include offset information based on the first power control offset information. Therefore, the second power control offset information can be used together with the first power control offset information in the SBFD symbol.

[0130] Meanwhile, the second power control offset information can be configured in the terminal in various ways.

[0131] For example, the second power control offset information may be transmitted to the terminal through a higher layer message together with the first power control offset information. For example, the second power control offset information may be transmitted to the terminal through an RRC message. The second power control offset information may be included as a field in the NZP-CSI-RS-Resource information element together with the first power control offset information. However, this is an example and there are no restrictions on the RRC message.

[0132] As another example, the second power control offset information may be preset to a fixed value. In this case, the first power control offset information may be transmitted to the terminal via an RRC message. As an example, the fixed value may be set as an offset value based on the synchronization signal block transmission power information. As another example, the fixed value may be set as an offset value based on the first power control offset information. In each case, the operation of calculating the transmission power for the channel state information reference signal may be applied by replacing it with the first power control offset information, as described above, or may be applied additionally to the first power control offset information.

[0133] A method for a base station (BS) to perform communication via sub band full duplex (SBFD) in a wireless communication system may include a step of transmitting a channel state information reference signal to a terminal in an SBFD symbol or a non-SBFD symbol using transmission power (S1020).

[0134] For example, when the transmission power is determined, the base station can transmit a channel state information reference signal to the terminal at the transmission power.

[0135] Additionally, the base station can transmit configuration information for each slot based on the TDD slot configuration information. Furthermore, the base station can configure UL or DL ​​subbands in specific slots or symbols for SBFD operation. These operations can be performed before transmitting channel state information.

[0136] Accordingly, the terminal may be configured with SBFD symbols or non-SBFD symbols. The base station may transmit a downlink reference signal in an SBFD symbol or a non-SBFD symbol. For example, the downlink reference signal may be a channel state information reference signal. That is, the downlink reference signal may be a CSI-RS. When the base station transmits a channel state information reference signal in an SBFD symbol or a non-SBFD symbol, it may mean that the symbol includes a CSI-RS resource element (RE).

[0137] The channel state information reference signal can be configured to be periodic or aperiodic, and may be transmitted only via SBFD symbols. Alternatively, the channel state information reference signal may be transmitted in both SBFD and non-SBFD symbols. Similarly, the channel state information reference signal may be transmitted only in non-SBFD symbols.

[0138] As explained above, when the channel state information reference signal is transmitted in an SBFD symbol or a non-SBFD symbol, the transmission power must be calculated differently depending on the symbol setting.

[0139] Through the above operations, the terminal can differentiate and calculate the transmission power when the channel state information reference signal is received in an SBFD symbol and when it is received in a non-SBFD symbol. Therefore, ambiguity regarding terminal operation in full duplex and errors in the channel state estimation process can be prevented.

[0140] Below, various detailed embodiments that can be performed by the aforementioned terminals and base stations are described in more detail. The aforementioned terminals and base stations can operate in any combination for the exemplary operations described below.

[0141] The present embodiments propose a new power control offset for defining the transmission power for a reference signal (CSI-RS) transmitted via an SBFD symbol. That is, for any SBFD-aware UE supporting SBFD, when a UL subband (or DL ​​subband) for SBFD operation is configured in any cell / carrier, a method for deriving / defining the transmission power of the CSI-RS in the cell / carrier where SBFD is configured for the UE is described.

[0142] For example, the transmission power of the CSI-RS can be set to a power control offset value compared to the SSB DL transmission power (i.e., ss-PBCH-BlockPower) for the terminal. That is, a CSI-RS transmission power offset value through an existing non-SBFD DL symbol and a CSI-RS transmission power offset value through a separate SBFD symbol can be defined. Accordingly, when any CSI-RS transmission is performed through a non-SBFD symbol, the terminal derives the CSI-RS reception power based on the power control offset value (the first power control offset information described above). Additionally, when any CSI-RS transmission is performed through an SBFD symbol, the CSI-RS transmission power can be defined based on a new power control offset value (the second power control offset information described above).

[0143] For example, the following three embodiments may be applied.

[0144] ① The second power control offset information (e.g., sbfd-powerControlOffsetSS) is set as a higher layer message.

[0145] ② The second power control offset information (e.g., sbfd-powerControlOffset) is set as a higher layer message.

[0146] ③ A fixed offset value (second power control offset information) based on the first power control offset information (e.g., powerControlOffsetSS) is predefined and configured in the terminal.

[0147] Below, the first power control offset information is described as an example using powerControlOffsetSS, and the second power control offset information is described as an example using sbfd-powerControlOffset or sbfd-powerControlOffsetSS, depending on its definition. In addition, depending on the embodiment, the second power control offset information is described as an example using a fixed value.

[0148] First, Method ① additionally configures sbfd-powerControlOffsetSS via an RRC message along with the existing powerControlOffsetSS for terminals with SBFD configured. For example, sbfd-powerControlOffsetSS can be defined as follows.

[0149] -sbfd-powerControlOffsetSS: which is the assumed ratio of NZP CSI-RS EPRE within the DL sub-band for SBFD(sub-band full duplex) to SS / PBCH block EPRE.

[0150] - RRC IE example: sbfd-powerControlOffsetSSENUMERATED{db-6, db-3, db0, db3}

[0151] When the CSI-RS configured for the UE is transmitted in the DL sub-band of the SBFD symbol, the UE calculates the transmission power of the downlink reference signal using sbfd-powerControlOffsetSS. That is, the UE can derive the CSI-RS EPRE using the SSB transmission power and the received sbfd-powerControlOffsetSS. If the CSI-RS is transmitted in a non-SBFD slot where SBFD is not configured, the UE can derive the CSI-RS EPRE using the SSB transmission power and the received powerControlOffsetSS.

[0152]

[0153] Next, for method ②, for terminals with SBFD set, an offset value based on powerControlOffsetSS can be additionally set together with powerControlOffsetSS. For example, an offset value based on powerControlOffsetSS can be defined as follows.

[0154] -sbfd-powerControlOffset: which is the assumed ratio of NZP CSI-RS EPRE within the DL sub-band for SBFD(sub-band full duplex) to NZP CSI-RS EPRE within the system bandwidth(non-SBFD).

[0155] - RRC IE example: sbfd-powerControlOffsetENUMERATED{db-1.5, db0, db1.5, db3}

[0156] When the CSI-RS configured for the UE is transmitted in the DL sub-band of the SBFD symbol, the UE calculates the transmission power using sbfd-powerControlOffset in addition to the SSB transmission power and powerControlOffsetSS parameters. That is, the UE can derive the CSI-RS EPRE by applying all of the SSB transmission power, powerControlOffsetSS, and the newly defined sbfd-powerControlOffset. If the CSI-RS is transmitted in a non-SBFD slot where SBFD is not configured, the UE can derive the CSI-RS EPRE using the SSB transmission power and powerControlOffsetSS.

[0157]

[0158] Next, the method ③ can be defined to always increase or decrease the power by the same x dB based on the power level derived for the CSI-RS transmitted with the existing non-SBFD for the terminal with SBFD set. This is to always apply the same difference in power level as the CSI-RS EPRE for non-SBFD by defining one of the values ​​(x db) of the sbfd-powerControlOffset values ​​that can be dynamically set by the base station in the method ② in the specification.

[0159] -sbfd-powerControlOffset: which is the assumed ratio of NZP CSI-RS EPRE within the DL sub-band for SBFD(sub-band full duplex) to NZP CSI-RS EPRE within the system bandwidth(non-SBFD).

[0160] - Example: sbfd-powerControlOffsetdb-1.5

[0161] When the CSI-RS configured for the UE is transmitted in the DL sub-band of the SBFD symbol, the UE calculates the transmission power by additionally applying x db or -x db to the CSI-RS EPRE using the SSB transmission power and the powerControlOffsetSS parameter. That is, after the UE derives the CSI-RS EPRE using the SSB transmission power and powerControlOffsetSS, the UE can derive the transmission power by further applying (+ or -) x db defined in the preset specification. In the case of the CSI-RS transmitted in a non-SBFD slot where SBFD is not configured, the UE can derive the CSI-RS EPRE using the SSB transmission power and powerControlOffsetSS.

[0162]

[0163] As described above, a base station can transmit reference signals set for a terminal by applying different transmission power levels between SBFD and non-SBFD symbols. In this case, the terminal can recognize the difference in transmission power for reference signals transmitted via SBFD and non-SBFD symbols, and can effectively measure the signal strength for the downlink channel.

[0164] Below, we briefly re-examine the configurations of the aforementioned terminals and base stations. Even if the descriptions are omitted below, the embodiments described above can be operated using the terminal and base station configurations described below.

[0165] Fig. 11 is a drawing showing the configuration of a terminal according to one embodiment.

[0166] Referring to FIG. 11, a terminal (1100) that performs communication via sub band full duplex (SBFD) in a wireless communication system may include a receiving unit (1130) that receives a channel state information reference signal from a base station in an SBFD symbol or a non-SBFD symbol, and a control unit (1110) that calculates transmission power for the channel state information reference signal by using at least one of first power control offset information and second power control offset information based on synchronization signal block transmission power information.

[0167] For example, the receiver (1130) can receive configuration information for each slot according to TDD slot configuration information. In addition, the receiver (1130) can configure a UL subband or DL ​​subband in a specific slot or symbol for SBFD operation.

[0168] Accordingly, the control unit (1110) may be configured with SBFD symbols or non-SBFD symbols. The receiving unit (1130) may receive a downlink reference signal from an SBFD symbol or a non-SBFD symbol. For example, the downlink reference signal may be a channel state information reference signal.

[0169] The channel state information reference signal can be configured to be periodic or aperiodic, and may be received only through SBFD symbols. Alternatively, the channel state information reference signal may be received in both SBFD and non-SBFD symbols. Similarly, the channel state information reference signal may be received only in non-SBFD symbols.

[0170] As explained above, the transmission power must be calculated differently depending on the symbol settings when the channel state information reference signal is received in an SBFD symbol or a non-SBFD symbol.

[0171] For example, the control unit (1110) can calculate the transmission power for the channel state information reference signal by applying at least one of the first power control offset information and the second power control offset information to the synchronization signal block transmission power information. When applying at least one of the first power control offset information and the second power control offset information, the control unit (1110) can apply it differently depending on whether the symbol in which the channel state information reference signal is received is an SBFD symbol.

[0172] For example, the control unit (1110) can calculate the transmission power for the channel state information reference signal in a non-SBFD symbol by applying the first power control offset information to the synchronization signal block transmission power information. For example, when the CSI-RS is received in a non-SBFD symbol, the control unit (1110) can derive the CSI-RS EPRE by using the SSB transmission power and the first power control offset information (e.g., powerControlOffsetSS) received through the upper layer signal. The first power control offset information includes information on the difference between the SSB transmission power and the CSI-RS transmission power.

[0173] As another example, the control unit (1110) can calculate the transmission power for the channel state information reference signal in the SBFD symbol by applying the second power control offset information to the synchronization signal block transmission power information. For example, when the CSI-RS is received in the SBFD symbol, the control unit (1110) can derive the CSI-RS EPRE using the SSB transmission power and the second power control offset information (e.g., sbfd-powerControlOffsetSS). The second power control offset information includes information on the difference between the SSB transmission power and the CSI-RS transmission power received in the SBFD symbol.

[0174] In order to calculate the CSI-RS transmission power in the SBFD symbol as described above, second power control offset information is configured in the terminal, and the control unit (1110) calculates the transmission power by applying the second power control offset information when the CSI-RS is received in the SBFD symbol. If the CSI-RS is received in a non-SBFD symbol, the control unit (1110) can calculate the transmission power by applying the first power control offset information instead of the second power control offset information. That is, the control unit (1110) can configure both the first power control offset information and the second power control offset information, and apply the appropriate offset information to the synchronization signal block transmission power according to the symbol in which the channel state information reference signal is received, to calculate the transmission power.

[0175] As another example, the control unit (1110) can calculate the transmission power for the channel state information reference signal in the SBFD symbol by applying the first power control offset information and the second power control offset information to the synchronization signal block transmission power information. For example, the second power control offset information (e.g., sbfd-powerControlOffset) can include information indicating an offset value for the first power control offset information. Accordingly, when the channel state information reference signal is received in the SBFD symbol, the control unit (1110) can calculate the transmission power by applying the first power control offset information based on the synchronization signal block transmission power and additionally applying the second power control offset information thereto. If the channel state information reference signal is received in a non-SBFD symbol, the control unit (1110) can calculate the transmission power by applying only the first power control offset information based on the synchronization signal block transmission power.

[0176] Meanwhile, the second power control offset information can be configured in the terminal in various ways.

[0177] For example, the second power control offset information may be received through a higher layer message together with the first power control offset information. For example, the second power control offset information may be configured in the terminal through an RRC message. The second power control offset information may be included as a field in the NZP-CSI-RS-Resource information element together with the first power control offset information. However, this is an example and there are no restrictions on the RRC message.

[0178] As another example, the second power control offset information may be preset to a fixed value. In this case, the first power control offset information may be received by the terminal via an RRC message. As an example, the fixed value may be set as an offset value based on the synchronization signal block transmission power information. As another example, the fixed value may be set as an offset value based on the first power control offset information. In each case, the operation of calculating the transmission power for the channel state information reference signal may be applied by replacing it with the first power control offset information, as described above, or may be applied additionally to the first power control offset information.

[0179] In addition, the control unit (1110) controls the overall operation of the terminal (1100) required to perform the aforementioned embodiments.

[0180] The transmitter (1120) and receiver (1130) are used to transmit and receive signals, messages, and data necessary for performing the aforementioned embodiments to and from the base station.

[0181] Fig. 12 is a diagram showing the configuration of a base station according to one embodiment.

[0182] Referring to FIG. 12, a base station (1200) that performs communication through sub band full duplex (SBFD) in a wireless communication system may include a control unit (1200) that determines transmission power for a channel state information reference signal in an SBFD symbol or a non-SBFD symbol by applying at least one of first power control offset information and second power control offset information based on synchronization signal block transmission power information, and a transmission unit (1220) that transmits a channel state information reference signal to a terminal in an SBFD symbol or a non-SBFD symbol with the transmission power.

[0183] For example, the control unit (1210) may determine the transmission power for the channel state information reference signal by applying at least one of the first power control offset information and the second power control offset information to the synchronization signal block transmission power information. When applying at least one of the first power control offset information and the second power control offset information, the control unit (1210) may apply it differently depending on whether the symbol through which the channel state information reference signal is transmitted is an SBFD symbol.

[0184] For example, the control unit (1210) can determine the transmission power for the channel state information reference signal in a non-SBFD symbol by applying the first power control offset information to the synchronization signal block transmission power information. For example, when the CSI-RS is transmitted in a non-SBFD symbol, the control unit (1210) can determine the CSI-RS EPRE by using the SSB transmission power and the first power control offset information (e.g., powerControlOffsetSS) transmitted to the terminal. The first power control offset information includes information on the difference between the SSB transmission power and the CSI-RS transmission power.

[0185] As another example, the control unit (1210) can determine the transmission power for the channel state information reference signal in the SBFD symbol by applying the second power control offset information to the synchronization signal block transmission power information. For example, when the CSI-RS is transmitted in the SBFD symbol, the control unit (1210) can determine the transmission power of the CSI-RS EPRE by using the SSB transmission power and the second power control offset information (e.g., sbfd-powerControlOffsetSS). The second power control offset information includes information on the difference between the SSB transmission power and the CSI-RS transmission power received in the SBFD symbol.

[0186] In order to determine the CSI-RS transmission power in the SBFD symbol as above and allow the terminal to calculate it, second power control offset information is configured in the terminal, and the terminal calculates the transmission power by applying the second power control offset information when the CSI-RS is received in the SBFD symbol. If the CSI-RS is transmitted in a non-SBFD symbol, the base station can determine the transmission power by applying the first power control offset information instead of the second power control offset information. That is, the control unit (1210) can configure both the first power control offset information and the second power control offset information, and apply the appropriate offset information to the synchronization signal block transmission power according to the symbol in which the channel state information reference signal is transmitted, to determine the transmission power.

[0187] As another example, the control unit (1210) can determine the transmission power for the channel state information reference signal in the SBFD symbol by applying the first power control offset information and the second power control offset information to the synchronization signal block transmission power information. For example, the second power control offset information (e.g., sbfd-powerControlOffset) can include information indicating an offset value for the first power control offset information. Accordingly, when the channel state information reference signal is transmitted in the SBFD symbol, the control unit (1210) can apply the first power control offset information based on the synchronization signal block transmission power and additionally apply the second power control offset information to determine the transmission power. If the channel state information reference signal is transmitted in a non-SBFD symbol, the control unit (1210) can determine the transmission power by applying only the first power control offset information based on the synchronization signal block transmission power.

[0188] Meanwhile, the second power control offset information can be configured in the terminal in various ways.

[0189] For example, the second power control offset information may be transmitted to the terminal through a higher layer message together with the first power control offset information. For example, the second power control offset information may be transmitted to the terminal through an RRC message. The second power control offset information may be included as a field in the NZP-CSI-RS-Resource information element together with the first power control offset information. However, this is an example and there are no restrictions on the RRC message.

[0190] As another example, the second power control offset information may be preset to a fixed value. In this case, the first power control offset information may be transmitted to the terminal via an RRC message. As an example, the fixed value may be set as an offset value based on the synchronization signal block transmission power information. As another example, the fixed value may be set as an offset value based on the first power control offset information. In each case, the operation of calculating the transmission power for the channel state information reference signal may be applied by replacing it with the first power control offset information, as described above, or may be applied additionally to the first power control offset information.

[0191] Additionally, when the transmission power is determined, the transmitter (1220) can transmit a channel state information reference signal to the terminal with the transmission power.

[0192] Additionally, the transmitter (1220) can transmit configuration information for each slot according to TDD slot configuration information. Furthermore, the base station can configure UL subbands or DL ​​subbands in specific slots or symbols for SBFD operation. This operation can be performed before transmitting channel state information.

[0193] Accordingly, the terminal may be configured with SBFD symbols or non-SBFD symbols. The transmitter (1220) may transmit a downlink reference signal in an SBFD symbol or a non-SBFD symbol. For example, the downlink reference signal may be a channel state information reference signal. That is, the downlink reference signal may be a CSI-RS.

[0194] The channel state information reference signal can be configured to be periodic or aperiodic, and may be transmitted only via SBFD symbols. Alternatively, the channel state information reference signal may be transmitted in both SBFD and non-SBFD symbols. Similarly, the channel state information reference signal may be transmitted only in non-SBFD symbols.

[0195] In addition, the control unit (1210) controls the overall operation of the base station (1200) required to perform the aforementioned embodiments.

[0196] The transmitter (1220) and receiver (1230) are used to transmit and receive signals, messages, and data necessary for performing the aforementioned embodiments to and from the terminal.

[0197]

[0198] The above-described embodiments may be supported by standard documents disclosed in at least one of the wireless access systems, IEEE 802, 3GPP, and 3GPP2. That is, steps, components, and parts not described in the present embodiments to clearly illustrate the technical concepts herein may be supported by the above-described standard documents. Furthermore, all terms disclosed in this specification may be explained by the above-described standard documents.

[0199] The embodiments described above may be implemented through various means. For example, the embodiments may be implemented through hardware, firmware, software, or a combination thereof.

[0200] In the case of hardware implementation, the method according to the present embodiments may be implemented by one or more ASICs (Application Specific Integrated Circuits), DSPs (Digital Signal Processors), DSPDs (Digital Signal Processing Devices), PLDs (Programmable Logic Devices), FPGAs (Field Programmable Gate Arrays), processors, controllers, microcontrollers, or microprocessors.

[0201] When implemented using firmware or software, the methods according to the present embodiments may be implemented in the form of devices, procedures, or functions that perform the functions or operations described above. The software code may be stored in a memory unit and executed by a processor. The memory unit may be located within or outside the processor and may exchange data with the processor using various known means.

[0202] Additionally, terms such as "system," "processor," "controller," "component," "module," "interface," "model," or "unit" as described above may generally refer to a computer-related entity, such as hardware, a combination of hardware and software, software, or software in execution. For example, the aforementioned components may be, but are not limited to, a process driven by a processor, a processor, a controller, a control processor, an object, a thread of execution, a program, and / or a computer. For example, both an application running on a controller or a processor and the controller or the processor may be components. One or more components may be within a process and / or thread of execution, and the components may be located on a single device (e.g., a system, a computing device, etc.) or distributed across two or more devices.

[0203] The above description is merely an illustrative example of the technical idea of ​​the present disclosure, and those skilled in the art to which the present disclosure pertains will appreciate that various modifications and variations can be made without departing from the essential characteristics of the technical idea of ​​the present disclosure. In addition, the present embodiments are not intended to limit the technical idea of ​​the present disclosure but rather to explain it, and therefore the scope of the technical idea of ​​the present disclosure is not limited by these embodiments. The scope of protection of the present disclosure should be interpreted by the claims below, and all technical ideas within a scope equivalent thereto should be interpreted as being included within the scope of the rights of the present disclosure.

[0204]

[0205] CROSS-REFERENCE TO RELATED APPLICATION

[0206] This patent application claims priority under 35 USC §119(a) to Korean Patent Application No. 10-2023-0105819, filed in Korea on August 11, 2023, and Korean Patent Application No. 10-2024-0096997, filed in Korea on July 23, 2024, the entire contents of which are incorporated herein by reference. This patent application also claims priority in countries other than the United States for the same reasons, the entire contents of which are incorporated herein by reference.

Claims

1. A method for a terminal (user equipment, UE) to perform communication through sub band full duplex (SBFD) in a wireless communication system, A step of receiving a channel state information reference signal in an SBFD symbol or a non-SBFD symbol from a base station; and A method comprising a step of calculating transmission power for the channel state information reference signal by applying at least one of first power control offset information and second power control offset information based on synchronization signal block transmission power information.

2. In paragraph 1, The step of calculating the above transmission power is: A method characterized in that the transmission power for the channel state information reference signal in the non-SBFD symbol is calculated by applying the first power control offset information to the transmission power information of the synchronization signal block.

3. In paragraph 1, The step of calculating the above transmission power is: A method characterized in that the transmission power for the channel state information reference signal in the SBFD symbol is calculated by applying the second power control offset information to the transmission power information of the synchronization signal block.

4. In paragraph 1, The step of calculating the above transmission power is: The transmission power for the channel state information reference signal in the SBFD symbol is calculated by applying the first power control offset information and the second power control offset information to the above-mentioned synchronization signal block transmission power information, A method characterized in that the second power control offset information indicates an offset value based on the first power control offset information.

5. In paragraph 1, The above second power control offset information is, A method characterized in that it is received through an upper layer message together with the first power control offset information.

6. In paragraph 1, The above first power control offset information is, A method characterized in that the second power control offset information is preset to a fixed value and is received through an upper layer message.

7. In a method for a base station (BS) to perform communication through sub band full duplex (SBFD) in a wireless communication system, A step for determining transmission power for a channel state information reference signal in an SBFD symbol or a non-SBFD symbol by applying at least one of the first power control offset information and the second power control offset information based on the synchronization signal block transmission power information; and A method comprising the step of transmitting the channel state information reference signal to the terminal in the SBFD symbol or non-SBFD symbol using the transmission power.

8. In paragraph 7, The step of determining the above transmission power is: A method characterized in that the transmission power for the channel state information reference signal in the non-SBFD symbol is determined by applying the first power control offset information to the transmission power information of the synchronization signal block.

9. In paragraph 7, The step of determining the above transmission power is: A method characterized in that the transmission power for the channel state information reference signal in the SBFD symbol is determined by applying the second power control offset information to the transmission power information of the synchronization signal block.

10. In paragraph 7, The step of determining the above transmission power is: The transmission power for the channel state information reference signal in the SBFD symbol is determined by applying the first power control offset information and the second power control offset information to the above-mentioned synchronization signal block transmission power information, A method characterized in that the second power control offset information indicates an offset value based on the first power control offset information.

11. In paragraph 7, The above first power control offset information is transmitted to the terminal through a higher layer message, The above second power control offset information is, A method characterized in that the first power control offset information is transmitted to the terminal through the upper layer message or is preset to the terminal as a fixed value.

12. In a user equipment (UE) that performs communication through sub band full duplex (SBFD) in a wireless communication system, A receiving unit for receiving a channel state information reference signal in an SBFD symbol or a non-SBFD symbol from a base station; and A terminal including a control unit that calculates transmission power for the channel state information reference signal by using at least one of first power control offset information and second power control offset information based on synchronization signal block transmission power information.

13. In paragraph 12, The above control unit, A terminal characterized in that the transmission power for the channel state information reference signal in the non-SBFD symbol is calculated by applying the first power control offset information to the transmission power information of the synchronization signal block.

14. In paragraph 12, The above control unit, A terminal characterized in that the transmission power for the channel state information reference signal in the SBFD symbol is calculated by applying the second power control offset information to the transmission power information of the synchronization signal block.

15. In paragraph 12, The above control unit, The transmission power for the channel state information reference signal in the SBFD symbol is calculated by applying the first power control offset information and the second power control offset information to the above-mentioned synchronization signal block transmission power information, A terminal characterized in that the second power control offset information indicates an offset value based on the first power control offset information.

16. In paragraph 12, The above second power control offset information is, A terminal characterized in that it receives the first power control offset information through an upper layer message.

17. In paragraph 12, The above first power control offset information is, A terminal characterized in that the second power control offset information is preset to a fixed value and is received through an upper layer message.

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