Method for controlling mobility of terminal, and apparatus therefor

Abstract

Provided are a method and an apparatus for controlling mobility of a terminal, the method comprising the steps of: receiving, from a base station, an RRC message including initial state indication information indicating an initial state of an L1 measurement operation or an L1 measurement reporting operation in an LTM procedure; determining, on the basis of the initial state indication information, whether to apply or configure the L1 measurement operation or the L1 measurement reporting operation according to the RRC message; receiving a MAC CE indicating whether to activate the L1 measurement operation or the L1 measurement reporting operation; and activating or deactivating the L1 measurement operation or the L1 measurement reporting operation on the basis of the MAC CE.

Description

Method for controlling the mobility of a terminal and the apparatus thereof

[0001] The present disclosure relates to L1 / L2 trigger-based mobility (LTM) control technology.

[0002] In mobile communication systems, handovers can occur frequently depending on the movement of the terminal. In particular, handovers can occur frequently when a user is using a mobile communication system while aboard a high-speed moving vehicle, such as a train, car, or airplane.

[0003] In the case of conventional L3-based handover, there is a problem in that it takes a long time for the terminal to perform the procedures required for the handover operation to the target base station. This issue raises concerns that it may become difficult to satisfy the required service quality as high-speed terminal movement occurs frequently and the number of services requiring high latency increases.

[0004] To address these issues, the need for terminal mobility control triggered at lower layers (L1 / L2) is emerging.

[0005] The present disclosure aims to provide a description of mobility control operations of a terminal on an L1 / L2 trigger-based mobility procedure.

[0006] In one aspect, a mobility control method of a terminal of the present disclosure provides a method comprising the steps of: receiving an RRC message from a base station that includes initial state instruction information indicating an initial state of an L1 measurement operation or an L1 measurement reporting operation in an LTM procedure; determining whether to apply or configure an L1 measurement operation or an L1 measurement reporting operation according to the RRC message based on the initial state instruction information; receiving a MAC CE indicating whether to enable an L1 measurement operation or an L1 measurement reporting operation; and enabling or disabling an L1 measurement operation or an L1 measurement reporting operation based on the MAC CE.

[0007] In another aspect, a method for a base station of the present disclosure to control a mobile operation of a terminal comprises the steps of: transmitting an RRC message to the terminal that includes initial state indication information indicating an initial state of an L1 measurement operation or an L1 measurement reporting operation of the terminal in an LTM procedure; transmitting a MAC CE to the terminal that indicates whether an L1 measurement operation or an L1 measurement reporting operation is activated; and receiving a measurement result of an activated L1 measurement operation from the terminal based on the MAC CE.

[0008] In another aspect, a terminal controlling a mobility operation comprises a receiver that receives an RRC message from a base station containing initial state instruction information indicating an initial state of an L1 measurement operation or an L1 measurement reporting operation in an LTM procedure, and a control unit that determines whether to apply or configure the L1 measurement operation or the L1 measurement reporting operation according to the RRC message based on the initial state instruction information, wherein the receiver further receives a MAC CE indicating whether to enable the L1 measurement operation or the L1 measurement reporting operation, and the control unit enables or disables the L1 measurement operation or the L1 measurement reporting operation based on the MAC CE.

[0009] In another aspect, a base station controlling the mobility operation of a terminal provides a base station device comprising: a transmitter that transmits to the terminal an RRC message containing initial state indication information indicating the initial state of the terminal's L1 measurement operation or L1 measurement reporting operation in an LTM procedure, and transmits to the terminal a MAC CE indicating whether the L1 measurement operation or L1 measurement reporting operation is activated; and a receiver that receives from the terminal a measurement result of the activated L1 measurement operation based on the MAC CE.

[0010] According to the present disclosure, a technology for mobility control operations of a terminal on an L1 / L2 trigger-based mobility procedure can be provided.

[0011] FIG. 1 is a diagram briefly illustrating the structure of an NR wireless communication system to which the present embodiment can be applied.

[0012] FIG. 2 is a drawing illustrating the frame structure in an NR system to which the present embodiment can be applied.

[0013] FIG. 3 is a diagram illustrating a resource grid supported by wireless access technology to which the present embodiment can be applied.

[0014] FIG. 4 is a diagram illustrating the bandwidth part supported by the wireless access technology to which the present embodiment can be applied.

[0015] FIG. 5 is a diagram illustrating an exemplary synchronization signal block in a wireless access technology to which the present embodiment can be applied.

[0016] FIG. 6 is a diagram illustrating a random access procedure in a wireless access technology to which the present embodiment can be applied.

[0017] Figure 7 is a diagram for explaining CORESET.

[0018] FIG. 8 is a diagram illustrating terminal operation according to one embodiment.

[0019] FIG. 9 is a diagram illustrating the operation of a base station according to one embodiment.

[0020] FIG. 10 is a drawing for explaining a terminal configuration according to one embodiment.

[0021] FIG. 11 is a drawing for explaining the configuration of a base station according to one embodiment.

[0022] Hereinafter, some embodiments of the present disclosure will be described in detail with reference to the exemplary drawings. In assigning reference numerals to the components of each drawing, the same components may have the same reference numeral as much as possible, even if they are shown in different drawings. Furthermore, in describing the embodiments, if it is determined that a detailed description of related known components or functions may obscure the essence of the technical concept, such detailed description may be omitted. Where terms such as "comprising," "having," or "consisting of" are used in this specification, other parts may be added unless "only" is used. Where a component is expressed in the singular, it may include a plural unless otherwise specified.

[0023] Additionally, terms such as first, second, A, B, (a), (b), etc., may be used to describe the components of the present disclosure. These terms are used merely to distinguish the components from other components, and the nature, order, sequence, or number of the components are not limited by such terms.

[0024] In describing the positional relationship of components, where it is stated that two or more components are "connected," "combined," or "joined," it should be understood that while the two or more components may be directly "connected," "combined," or "joined," they may also be "connected," "combined," or "joined" with other components "intervened." Here, the other components may be included in one or more of the two or more components that are "connected," "combined," or "joined" with one another.

[0025] In describing the temporal flow relationship regarding components, methods of operation, or methods of production, for example, when the temporal or sequential relationship is described using "after," "following," "next," or "before," it may include cases where the relationship is not continuous unless "immediately" or "directly" is used.

[0026] Meanwhile, where numerical values ​​or corresponding information regarding a component (e.g., levels, etc.) are mentioned, even without separate explicit notation, the numerical values ​​or corresponding information may be interpreted as including a range of error that may occur due to various factors (e.g., process factors, internal or external shocks, noise, etc.).

[0027] A wireless communication system in this specification refers to a system for providing various communication services, such as voice and data packets, using wireless resources, and may include a terminal, a base station, or a core network.

[0028] The embodiments disclosed below may be applied to wireless communication systems using various wireless access technologies. For example, the embodiments may 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). Furthermore, wireless access technology may refer not only to specific access technologies but also to communication technologies for each generation established by various telecommunication organizations such as 3GPP, 3GPP2, WiFi, Bluetooth, IEEE, and ITU. For example, CDMA may be implemented as a wireless technology such as UTRA (universal terrestrial radio access) or CDMA2000. TDMA may be implemented as a wireless technology such as GSM (global system for mobile communications), GPRS (general packet radio service), or EDGE (enhanced datarates for GSM evolution). OFDMA can be implemented using wireless technologies such as IEEE (Institute of Electrical and Electronic 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-UMTS terrestrial radio access), employing OFDMA in the downlink and SC-FDMA in the uplink. As such, these embodiments can be applied to currently disclosed or commercialized radio access technologies, and can also be applied to radio access technologies currently under development or to be developed in the future.

[0029] Meanwhile, the term "terminal" in this specification is a comprehensive concept meaning a device including a wireless communication module that communicates with a base station in a wireless communication system. It should be interpreted as a concept that includes not only User Equipment (UE) in WCDMA, LTE, NR, HSPA, and IMT-2020 (5G or New Radio), but also Mobile Station (MS), User Terminal (UT), Subscriber Station (SS), and wireless device in GSM. Furthermore, depending on the usage type, the terminal may be a user portable device such as a smartphone, or in a V2X communication system, it may refer to a vehicle or a device including a wireless communication module inside a vehicle. Additionally, in the case of a Machine Type Communication (MMC) system, it may refer to an MTC terminal, M2M terminal, URLLC terminal, etc., equipped with a communication module to perform machine type communication.

[0030] In this specification, "base station" or "cell" refers to an end that communicates with a terminal in terms of a network, and encompasses 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., Transmitter Point, Receiver Point, Transceiver Point), Relay Node, Mega Cell, Macro Cell, Micro Cell, Pico Cell, Femto Cell, RRH (Remote Radio Head), RU (Radio Unit), and Small Cell. Additionally, "cell" may include a Bandwidth Part (BWP) in the frequency domain. For example, a serving cell may refer to the Activation BWP of a terminal.

[0031] Since there is a base station controlling one or more of the various cells listed above, the term "base station" can be interpreted in two senses. 1) It may refer to the 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 may refer to the wireless area itself. In 1), all devices that provide a specific wireless area are controlled by the same entity or interact to configure the wireless area collaboratively are referred to as base stations. Depending on the configuration method of the wireless area, a point, a transmitting / receiving point, a transmitting point, a receiving point, etc., are examples of a base station. In 2), the wireless area itself that receives or transmits a signal from the perspective of a user terminal or from the perspective of a neighboring base station may also be referred to as a base station.

[0032] In this specification, "Cell" may refer to a component carrier having coverage of a signal transmitted from a transmitting / receiving point or coverage of a signal transmitted from a transmitting / receiving point (transmission point or transmission / reception point), or the transmitting / receiving point itself.

[0033] Uplink (UL, or Uplink) refers to the method of transmitting and receiving data from a terminal to a base station, and Downlink (DL, or Downlink) refers to the 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 and reception points to a terminal, and uplink may refer to communication or a communication path from a terminal to multiple transmission and reception points. In this case, in the downlink, the transmitter may be part of the multiple transmission and reception points, and the receiver may be part of the terminal. Additionally, in the uplink, the transmitter may be part of the terminal, and the receiver may be part of the multiple transmission and reception points.

[0034] The 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). In the following, the situation in which signals are transmitted and received through channels such as PUCCH, PUSCH, PDCCH, and PDSCH is also indicated in the form of "transmitting and receiving PUCCH, PUSCH, PDCCH, and PDSCH."

[0035] To clarify the explanation, the technical concept described below is primarily based on 3GPP LTE / LTE-A / NR (New RAT) communication systems, but the technical features are not limited to said communication systems.

[0036] Following research on 4G (4th-Generation) communication technology, 3GPP develops 5G (5th-Generation) communication technology to meet the requirements of the ITU-R for next-generation radio access technology. Specifically, 3GPP develops LTE-A pro, which enhances LTE-Advanced technology to meet ITU-R requirements, and NR, a new communication technology distinct from 4G communication technology, as 5G communication technologies. Since both LTE-A pro and NR refer to 5G communication technology, the following explanation of 5G communication technology will focus on NR unless a specific technology is being identified.

[0037] The operational scenarios in NR define various operation scenarios by adding considerations for satellites, automobiles, and new verticals to the existing 4G LTE scenarios, and in terms of service, they support eMBB (Enhanced Mobile Broadband) scenarios, mMTC (Massive Machine Communication) scenarios which require low data rates and asynchronous access while having high terminal density and being deployed over a wide range, and URLLC (Ultra Reliability and Low Latency) scenarios which require high responsiveness and reliability and can support high-speed mobility.

[0038] To satisfy these scenarios, NR introduces a wireless communication system equipped with new waveform and frame structure technologies, low latency technology, mmWave support technology, and forward compatibility technology. In particular, the NR system presents various technical changes in terms of flexibility to provide forward compatibility. The main technical features of NR are explained below with reference to the drawings.

[0039]

[0040] <NR 시스템 일반>

[0041] FIG. 1 is a simplified diagram illustrating the structure of an NR system to which the present embodiment can be applied.

[0042] Referring to FIG. 1, the NR system is divided into a 5G Core Network (5GC) and an NR-RAN part. The NG-RAN consists of gNBs and ng-eNBs that provide control plane (RRC) protocol endpoints for the user plane (SDAP / PDCP / RLC / MAC / PHY) and User Equipment (UE). gNBs are interconnected with each other, or gNBs and ng-eNBs are interconnected via Xn interfaces. Each gNB and ng-eNB is connected to the 5GC via an NG interface. The 5GC may be configured to include an Access and Mobility Management Function (AMF), which is responsible for control plane functions such as terminal access and mobility control, and a User Plane Function (UPF), which is responsible for control functions for user data. The NR includes support for both frequency bands below 6 GHz (FR1, Frequency Range 1) and frequency bands above 6 GHz (FR2, Frequency Range 2).

[0043] gNB refers to a base station that provides NR user plane and control plane protocol terminations to a terminal, and ng-eNB refers to a base station that provides E-UTRA user plane and control plane protocol terminations to a terminal. The base station described in this specification should be understood as encompassing both gNB and ng-eNB, and may be used to refer to gNB or ng-eNB separately as needed.

[0044] <NR 웨이브 폼,뉴머롤러지 및 프레임 구조>

[0045] In NR, CP-OFDM waveforms using a cyclic prefix are used for downlink transmission, and CP-OFDM or DFT-s-OFDM are used for uplink transmission. OFDM technology is easy to combine with MIMO (Multiple Input Multiple Output) and has the advantage of allowing the use of low-complexity receivers along with high frequency efficiency.

[0046] Meanwhile, in NR, since the requirements for data rate, latency, coverage, etc. differ for each of the three scenarios mentioned above, it is necessary to efficiently satisfy the requirements for each scenario through the frequency bands that constitute an arbitrary NR system. To this end, a technology has been proposed to efficiently multiplex wireless resources based on multiple different numerologies.

[0047] Specifically, the NR transmission numerator is determined based on sub-carrier spacing and CP (Cyclic prefix), and as shown in Table 1 below, the μ value is used as an exponential value of 2 based on 15 kHz and changes exponentially.

[0048] μsubcarrier intervalCyclic prefixSupported for dataSupported for synch015NormalYesYes130NormalYesYes260Normal, ExtendedYesNo3120NormalYesYes4240NormalNoYes

[0049] As shown in Table 1 above, the numerators of NR can be classified into five types based on the subcarrier spacing. This differs from LTE, one of the 4G communication technologies, where the subcarrier spacing is fixed at 15 kHz. Specifically, the subcarrier spacings used for data transmission in NR are 15, 30, 60, and 120 kHz, while the subcarrier spacings used for synchronization signal transmission are 15, 30, 120, and 240 kHz. Additionally, extended CP is applied only to the 60 kHz subcarrier spacing. Meanwhile, the frame structure in NR defines a frame with a length of 10 ms, composed of 10 subframes of equal length of 1 ms. A single 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 illustrating the frame structure in an NR system to which the present embodiment can be applied.

[0050] Referring to Fig. 2, in the case of a normal CP, the slot is fixedly composed of 14 OFDM symbols, but the length of the slot in the time domain may vary depending on the subcarrier spacing. For example, in the case of a numeral with a 15 kHz subcarrier spacing, the slot is composed of a length of 1 ms, which is the same length as the subframe. In contrast, in the case of a numeral with a 30 kHz subcarrier spacing, the slot is composed of 14 OFDM symbols, but two slots may be included in one subframe with a length of 0.5 ms. That is, the subframe and the frame are defined with a fixed time length, while the slot is defined by the number of symbols and the time length may vary depending on the subcarrier spacing.

[0051] Meanwhile, NR defines the basic unit of scheduling as a slot and introduced mini-slots (or sub-slots or non-slot based schedules) to reduce transmission delay in the wireless section. Using a wide subcarrier spacing reduces transmission delay in the wireless section because the length of a single slot becomes inversely shorter. Mini-slots (or sub-slots) are designed for efficient support of URLLC scenarios and allow scheduling in units of 2, 4, or 7 symbols.

[0052] Furthermore, unlike LTE, NR defines uplink and downlink resource allocation at the symbol level within a single slot. To reduce HARQ latency, a slot structure was defined that allows HARQ ACK / NACK to be transmitted directly within the transmission slot; this slot structure is described as a self-contained structure.

[0053] NR is designed to support a total of 256 slot formats, of which 62 are used in 3GPP Rel-15. Additionally, it supports common frame structures that form FDD or TDD frames through various slot combinations. For example, it supports slot structures where all slot symbols are set to downlink, slot structures where all symbols are set to uplink, and slot structures where downlink and uplink symbols are combined. Furthermore, NR supports data transmission being distributed and scheduled across one or more slots. Therefore, base stations can use a Slot Format Indicator (SFI) to inform a terminal whether a slot is a downlink slot, an uplink slot, or a flexible slot. Base stations can indicate the slot format by using the SFI to indicate an index of a table configured via UE-specific RRC signaling, or they can indicate it dynamically via Downlink Control Information (DCI) or statically or semi-statically via RRC.

[0054] <NR 물리 자원 >

[0055] Regarding physical resources in NR, antenna ports, resource grids, resource elements, resource blocks, and bandwidth parts are considered.

[0056] An antenna port is defined such that the channel carrying a symbol on the antenna port can be inferred from the channel carrying another symbol on the same antenna port. If the large-scale property of the channel carrying a symbol on one antenna port can be inferred from the channel carrying a symbol on another antenna port, the two antenna ports can be said to be in a QC / QCL (quasi-co-located or quasi-co-location) relationship. Here, the large-scale property includes one or more of delay spread, Doppler spread, frequency shift, average received power, and received timing.

[0057] FIG. 3 is a diagram illustrating a resource grid supported by wireless access technology to which the present embodiment can be applied.

[0058] Referring to FIG. 3, a resource grid may exist for each numerator because NR supports multiple numerators on the same carrier. Additionally, a resource grid may exist depending on the antenna port, subcarrier spacing, and transmission direction.

[0059] A resource block consists of 12 subcarriers and is defined only in the frequency domain. Additionally, a resource element consists of one OFDM symbol and one subcarrier. Therefore, as shown in Fig. 3, the size of a single resource block can vary depending on the subcarrier spacing. Furthermore, NR defines "Point A," which serves as a common reference point for the resource block grid, as well as common resource blocks, virtual resource blocks, etc.

[0060] FIG. 4 is a diagram illustrating the bandwidth part supported by the wireless access technology to which the present embodiment can be applied.

[0061] In NR, unlike LTE where the carrier bandwidth is fixed at 20 MHz, the maximum carrier bandwidth is set from 50 MHz to 400 MHz depending on the subcarrier interval. Therefore, it is not assumed that all terminals use this entire carrier bandwidth. Accordingly, in NR, as shown in Fig. 4, a Bandwidth Part (BWP) can be designated within the carrier bandwidth for the terminal to use. Additionally, a Bandwidth Part is associated with a single numerator and consists of a subset of a continuous common resource block, and can be dynamically activated over time. Up to four Bandwidth Parts are configured for the uplink and downlink respectively, and data is transmitted and received using the Bandwidth Part activated at a given time.

[0062] In the case of paired spectrum, the uplink and downlink bandwidth parts are set independently, whereas in the case of unpaired spectrum, the downlink and uplink bandwidth parts are paired to share a center frequency in order to prevent unnecessary frequency re-tuning between downlink and uplink operations.

[0063] <NR 초기 접속>

[0064] In NR, the terminal performs cell search and random access procedures to connect to the base station and perform communication.

[0065] Cell search is a procedure in which a terminal uses a Synchronization Signal Block (SSB) transmitted by a base station to synchronize with the corresponding base station's cell, obtain a physical layer cell ID, and acquire system information.

[0066] FIG. 5 is a diagram illustrating an exemplary synchronization signal block in a wireless access technology to which the present embodiment can be applied.

[0067] Referring to FIG. 5, the SSB consists 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.

[0068] The terminal monitors the SSB in the time and frequency domains and receives the SSB.

[0069] SSBs can be transmitted up to 64 times within 5ms. Multiple SSBs are transmitted via different transmission beams within the 5ms timeframe, and the terminal performs detection by assuming that an SSB is transmitted every 20ms when viewed from the perspective of a specific beam used for transmission. The number of beams available for SSB transmission within the 5ms timeframe can increase as the frequency band increases. For example, up to 4 SSB beams can be transmitted at 3GHz or lower, up to 8 beams in the frequency band from 3GHz to 6GHz, and up to 64 different beams can be used to transmit SSBs in the frequency band above 6GHz.

[0070] Two SSBs are included in a single slot, and the starting symbol and number of repetitions within the slot are determined according to the subcarrier interval as follows.

[0071] Meanwhile, unlike the SS of conventional LTE, the SSB is not transmitted at the center frequency of the carrier bandwidth. That is, the SSB can be transmitted even at locations other than the center of the system band, and multiple SSBs can be transmitted across the frequency domain when broadband operation is supported. Accordingly, the terminal monitors the SSB using a synchronization raster, which is a candidate frequency location for monitoring the SSB. The carrier raster, which is information on the center frequency location of the channel for initial connection, and the synchronization raster were newly defined in NR, and the synchronization raster is set with a wider frequency interval compared to the carrier raster, thereby supporting fast SSB search by the terminal.

[0072] The terminal can obtain the MIB through the SSB's PBCH. The Master Information Block (MIB) contains minimum information for the terminal to receive the Remaining Minimum System Information (RMSI) broadcast by the network. Additionally, the PBCH may include information regarding the location of the first DM-RS symbol in the time domain, information for the terminal to monitor SIB1 (e.g., SIB1 numeral information, information related to SIB1 CORESET, search space information, PDCCH related parameter information, etc.), and offset information between the Common Resource Block and the SSB (the absolute location of the SSB within the carrier is transmitted via SIB1). Here, the SIB1 numeral information is applied identically to some messages used in the random access procedure for the terminal to connect to the base station after completing the cell search procedure. For example, the SIB1 numeral information may be applied to at least one of messages 1 to 4 for the random access procedure.

[0073] The aforementioned RMSI may refer to SIB1 (System Information Block 1), and SIB1 is broadcast periodically (e.g., 160ms) from the cell. SIB1 contains information necessary for the terminal to perform the initial random access procedure and is transmitted periodically via PDSCH. To receive SIB1, the terminal must receive the numerology information used for transmitting SIB1 and the CORESET (Control Resource Set) information used for scheduling SIB1 via PBCH. The terminal checks the scheduling information for SIB1 using SI-RNTI within the CORESET and obtains SIB1 on the PDSCH according to the scheduling information. The remaining SIBs, excluding SIB1, may be transmitted periodically or upon the terminal's request.

[0074] FIG. 6 is a diagram illustrating a random access procedure in a wireless access technology to which the present embodiment can be applied.

[0075] Referring to FIG. 6, when cell search is completed, the terminal transmits a random access preamble for random access to the base station. The random access preamble is transmitted via PRACH. Specifically, the random access preamble is transmitted to the base station via PRACH, which consists of a series of radio resources in specific slots that are repeated periodically. Generally, when the terminal initially connects to 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.

[0076] The terminal receives a random access response for 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 a single random access response may contain 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 coordinate uplink synchronization. The random access response may be indicated by the random access identifier on the PDCCH, namely the RA-RNTI (Random Access - Radio Network Temporary Identifier).

[0077] A terminal that receives a valid random access response processes the information contained in the random access response and performs a transmission scheduled to the base station. For example, the terminal applies a TAC and stores a temporary C-RNTI. Additionally, using a UL Grant, it transmits data stored in the terminal's buffer or newly generated data to the base station. In this case, information that can identify the terminal must be included.

[0078] Finally, the terminal receives a downlink message to resolve competition.

[0079] <NR CORESET>

[0080] 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), TPC (Transmit Power Control) information, etc.

[0081] In this way, NR introduced the concept of CORESET to ensure system flexibility. CORESET (Control Resource Set) refers to time-frequency resources for downlink control signals. A terminal can decode control channel candidates by using one or more search spaces from the CORESET time-frequency resources. Quasi CoLocation (QCL) assumptions were established for each CORESET, and these are used to indicate characteristics regarding the analog beam direction in addition to the characteristics assumed by conventional QCL, such as delay spread, Doppler spread, Doppler shift, and mean delay.

[0082] Figure 7 is a diagram for explaining CORESET.

[0083] Referring to FIG. 7, CORESET can exist in various forms within a single slot and within the carrier bandwidth, and in the time domain, CORESET can be composed of up to 3 OFDM symbols. Additionally, CORESET is defined as a multiple of 6 resource blocks up to the carrier bandwidth in the frequency domain.

[0084] The first CORESET is specified via the MIB as part of the initial bandwidth part configuration to enable the reception of additional configuration and system information from the network. After establishing a connection with the base station, the terminal can be configured by receiving one or more CORESET information via RRC signaling.

[0085] In this specification, frequencies, frames, subframes, resources, resource blocks, regions, bands, subbands, control channels, data channels, synchronization signals, various reference signals, various signals, or various messages related to NR (New Radio) may be interpreted in the sense used in the past or present, or in various senses used in the future.

[0086]

[0087] LTM (L1 / L2 Triggered Mobility)

[0088] 3GPP standardized L1 / L2 Triggered Mobility (LTM) functions in Rel-18. LTM according to conventional technology is a procedure in which a base station (gNB) receives an L1 measurement report from a terminal (UE) and, based on this, changes the terminal's serving cell (e.g., PCell / PSCell) by means of a cell switch command signaled via MAC CE. The cell switch command instructs the LTM candidate configurations that the gNB prepares in advance and provides to the UE via RRC signaling. The UE then switches to the target cell in accordance with the cell switch command.

[0089] LTM can incur significant overhead regarding L1 measurements for candidate cells and the reporting based thereon. Base stations may require periodic L1 beam level measurements / reporting and / or frequent L1 event-triggered L1 beam level measurements / reporting to select candidate beams and cells for early synchronization and / or for the LTM cell switch procedure. In particular, LTM technology has supported follow-up LTM. Follow-up LTM refers to the terminal performing an LTM cell switch without the candidate configuration needing to be reconfigured by the network. For example, it indicates performing an LTM cell switch to another candidate cell without reconfiguring the candidate cell / configuration via an RRC reconfiguration message. Follow-up LTM can be executed by repeating the early synchronization, LTM execution, and LTM completion steps without releasing another LTM candidate configuration after each LTM completion. For reference, the LTM procedure is divided into the LTM preparation phase, which prepares the LTM candidate configuration, the early synchronization phase, the LTM cell switch execution phase, and the LTM cell switch completion phase. However, depending on the characteristics of these LTMs, the overhead caused by L1 beam level measurements and reports by different beams within one or more candidate cells can be significant.

[0090] Conventional LTMs had a significant problem with the overhead associated with L1 measurements and reporting based on them during the process of supporting LTM procedures.

[0091] In order to solve these problems, the present disclosure proposes a method and apparatus for reducing L1 beam level measurement and resulting reporting caused by LTM support.

[0092]

[0093] The following describes a method for controlling mobility and reporting based on 5G NR wireless access technology. However, this is for the convenience of explanation, and the present invention may also be applied to cell changing / switching based on any wireless access technology (e.g., 6G). The embodiments described in the present invention include information elements, procedures, and operation details specified in any NR standard (e.g., TS 38.321, an NR MAC standard; TS 38.331, an NR RRC standard). Even if the definition of the relevant information elements, related procedures, and related terminal operation details are not described in this specification, the relevant details specified in known standard specifications may be included in the present invention. The embodiments provided below may be implemented individually or by arbitrarily combining / combining each embodiment (or operations included in the embodiments), and it is obvious that this also falls within the scope of the present disclosure.

[0094] Any function described below may be defined as an individual terminal capability (UE radio capability or UE Core network capability) and transmitted by the terminal to a base station / core network entity (e.g., AMF / SMF) via the corresponding signaling. Alternatively, any functions may be combined / combined to be defined as the corresponding terminal capability and transmitted to a base station / core network entity via the corresponding signaling upon the request of the base station.

[0095] The base station may transmit or instruct the terminal via an RRC message regarding information instructing the permission, support, configuration, or activation of any function or combination of functions described below. For example, this may be instructed to the terminal before, after, or simultaneously with the configuration or application of the said function or combination of functions. Such RRC messages may be broadcast via system information. Alternatively, they may be instructed to the terminal via a dedicated RRC message.

[0096] Below, embodiments regarding L1 beam level measurement and embodiments regarding measurement result reporting are described separately. Each embodiment can be applied to a terminal and a base station in any combination thereof. That is, the terminal and the base station may perform operations for embodiments in which one of the embodiments related to the measurement configuration and one of the embodiments related to the reporting configuration described below are arbitrarily combined. Of course, the terminal and the base station may also perform operations for each of the measurement and reporting operations individually.

[0097]

[0098] FIG. 8 is a diagram illustrating terminal operation according to one embodiment.

[0099] Referring to FIG. 8, the mobility control method (S800) of a terminal may include the step of receiving an RRC message from a base station that includes initial state instruction information indicating an initial state of an L1 measurement operation or an L1 measurement reporting operation in an LTM procedure (S810).

[0100] For example, the terminal may receive configuration information for LTM procedure operation through an RRC message transmitted by the base station. For example, the configuration information may be LTM configuration information. The LTM configuration information may include at least one of LTM candidate configuration, LTM CSI resource configuration, and LTM CSI reporting configuration. Additionally, the RRC message may be an RRC connection reconfiguration message.

[0101] LTM configuration information may include candidate cell information for the terminal to execute an LTM procedure, measurement information for L1 measurement, and reporting information for reporting L1 measurement results. LTM candidate configuration may include at least one of candidate cell information, measurement information, and reporting information. LTM CSI resource configuration may include CSI-RS resource set information that the terminal monitors and measures for L1 measurement. LTM CSI reporting configuration may include a reporting period, reporting resources, information included in the report, etc., for reporting L1 measurement results measured by the terminal.

[0102] The aforementioned LTM configuration information may include LTM candidate configurations, LTM CSI resource configurations, and LTM CSI reporting configurations, and the LTM candidate configurations, LTM CSI resource configurations, and LTM CSI reporting configurations may each be interconnected or configured in an inclusion relationship through any combination.

[0103] Meanwhile, the RRC message may include initial state indication information to indicate the initial state of the terminal's L1 measurement operation or L1 measurement reporting operation.

[0104] For example, the initial state instruction information may include information indicating whether to initially enable an L1 measurement action or an L1 measurement reporting action for a set of CSI-RS resources associated with one or more of an LTM candidate configuration, an LTM CSI resource configuration, and an LTM CSI reporting configuration. As an example, the initial state instruction information may include information indicating whether to enable or disable an L1 measurement action or an L1 measurement reporting action for each set of CSI-RS resources for L1 measurement. As another example, the initial state instruction information may include information indicating whether to enable or disable an action for each LTM candidate configuration. As yet another example, the initial state instruction information may include information indicating whether to enable or disable an action for each LTM CSI resource configuration. As yet another example, the initial state instruction information may include information indicating whether to enable or disable an action for each LTM CSI reporting configuration.

[0105] One or more CSI-RS resource sets may be configured to be linked to at least one of an LTM candidate configuration, an LTM CSI resource configuration, and an LTM CSI reporting configuration. Here, being configured to be linked may mean that CSI-RS resource set information is included in the LTM candidate configuration, the LTM CSI resource configuration, or the LTM CSI reporting configuration. Additionally, being configured to be linked may include cases where the CSI-RS resource set and the LTM CSI reporting configuration are included in the LTM CSI resource configuration and configured at the same level. Alternatively, it may include cases where they are linked through specific identification information, etc.

[0106] Accordingly, the initial state indication information may explicitly or implicitly indicate the initial activation status of one or more CSI-RS resource sets associated with each by indicating whether to activate the LTM candidate configuration, LTM CSI resource configuration, and LTM CSI reporting configuration, respectively.

[0107] The mobility control method (S800) of the terminal may include a step of determining whether to apply or configure an L1 measurement operation or an L1 measurement reporting operation according to an RRC message based on initial state instruction information (S820).

[0108] For example, the terminal may store and configure information for the operation of an LTM procedure of an RRC message received from a base station. Based on the aforementioned initial state instruction information, the terminal may apply or configure the L1 measurement operation or L1 measurement reporting operation in the LTM procedure to an enabled or disabled state. For example, the terminal may store the information received via the RRC message, but regarding the execution of the L1 measurement operation based on each piece of information, it may apply only to the CSI-RS resource set enabled according to the initial state instruction information. Alternatively, the terminal may store the information received via the RRC message, but regarding the execution of the L1 measurement reporting operation based on each piece of information, it may apply only to the measurement reporting of the CSI-RS resource set enabled according to the initial state instruction information.

[0109] An RRC message may include an LTM configuration for performing an L1 measurement operation or an L1 measurement reporting operation for one or more candidate cells. Accordingly, an RRC message may include information for measurement or measurement reporting for multiple candidate cells. In this case, it may be an unnecessary waste of resources for the terminal to continuously perform an L1 measurement or L1 measurement reporting operation for all candidate cells. Therefore, in the present disclosure, only the L1 measurement operation or L1 measurement reporting operation indicated as an active state by the initial state indication information may be performed initially.

[0110] As described above, the initial state instruction information may indicate whether to enable any one of the LTM candidate configurations, LTM CSI resource configurations, LTM CSI reporting configurations, and CSI-RS resource sets. Accordingly, in the case of a configuration indicated as enabled, the terminal applies or configures it in the enabled state to perform operations. If there is a configuration indicated as disabled, the terminal may apply or configure operations related to that configuration in the disabled state.

[0111] At least one of the LTM candidate configuration, LTM CSI resource configuration, and LTM CSI reporting configuration is configured in conjunction with a CSI-RS resource set; when activation is indicated at the configuration level, the terminal applies or configures L1 measurement operations or L1 measurement reporting operations for all CSI-RS resource sets associated with the configuration in a collectively enabled or disabled state.

[0112] The method for controlling the mobility of a terminal (S800) may include the step of receiving a MAC CE indicating whether to activate an L1 measurement operation or an L1 measurement reporting operation (S830).

[0113] For example, a terminal may receive a MAC CE from a base station after receiving an RRC message for an LTM procedure. Although the initial state for an L1 measurement operation or an L1 measurement reporting operation is configured to be enabled or disabled according to the initial state instruction information, the base station needs to instruct a change to the enabled state. To this end, the base station can dynamically change the enabled or disabled state by transmitting a MAC CE to the terminal.

[0114] For example, MAC CE may include instruction information indicating whether to enable an L1 measurement operation or an L1 measurement reporting operation for a CSI-RS resource set associated with one or more of an LTM candidate configuration, an LTM CSI resource configuration, and an LTM CSI reporting configuration. Similar to initial state instruction information, the instruction information may also be configured to indicate whether to enable any one of the LTM candidate configuration, an LTM CSI resource configuration, an LTM CSI reporting configuration, and a CSI-RS resource set. However, since a CSI-RS resource set is associated with at least one of the LTM candidate configuration, an LTM CSI resource configuration, and an LTM CSI reporting configuration, the L1 measurement operation or an L1 measurement reporting operation associated with the CSI-RS resource set may be indicated whether to enable it explicitly or implicitly.

[0115] For example, the instruction information may include information indicating whether to enable per LTM candidate configuration, per LTM CSI resource configuration, or per LTM CSI reporting configuration. One or more CSI-RS resource sets are linked and configured for each LTM candidate configuration, each LTM CSI resource configuration, or each LTM CSI reporting configuration. Accordingly, for one or more CSI-RS resource sets, L1 measurement operations or L1 measurement reporting operations may be enabled or disabled depending on whether to enable according to the instruction information for each LTM candidate configuration, each LTM CSI resource configuration, or each LTM CSI reporting configuration.

[0116] The instructions based on MAC CE and the initial state instructions based on RRC messages can indicate whether to enable or disable the same level (LTM candidate configuration, LTM CSI resource configuration, LTM CSI reporting configuration, or CSI-RS resource set). Alternatively, the instructions based on MAC CE and the initial state instructions based on RRC messages can indicate whether to enable or disable the same level.

[0117] Meanwhile, MAC CE may be configured to be associated with periodic or event-triggered L1 measurement reporting operations. For example, an activation instruction via MAC CE may be applied only to periodic L1 measurement reporting operations. Alternatively, an activation instruction via MAC CE may be applied only to event-triggered L1 measurement reporting operations. In addition, an activation instruction based on the MAC CE's instruction information may be applied only under specific configuration conditions.

[0118] MAC CE may include at least one of LTM candidate configuration identification information, LTM CSI resource configuration identification information, LTM CSI reporting configuration identification information, cell identification information, CSI-RS resource set identification information, and instruction information indicating whether to enable L1 measurement operation or L1 measurement reporting operation.

[0119] For example, LTM candidate configuration identification information, LTM CSI resource configuration identification information, LTM CSI report configuration identification information, cell identification information, and CSI-RS resource set identification information can each be associated with corresponding identification information included in an RRC message. Through this, the terminal can determine which configuration or information configured in the terminal is indicated by the identification information of the MAC CE. Additionally, indication information can be set in correspondence with or associated with the identification information. The indication information can be composed of a 1-bit A / D field. That is, the indication information indicates whether the corresponding identification information is in an active or inactive state.

[0120] As described above, depending on the level at which activation is indicated, at least one of LTM candidate configuration identification information, LTM CSI resource configuration identification information, LTM CSI report configuration identification information, cell identification information, and CSI-RS resource set identification information may be included in MAC CE.

[0121] The mobility control method (S800) of the terminal may include the step of enabling or disabling an L1 measurement operation or an L1 measurement reporting operation based on MAC CE (S840).

[0122] The terminal changes the state of the configuration or resource set corresponding to the identification information indicated by the MAC CE to enabled or disabled. Since the state of the configuration or resource set is configured in the terminal according to the initial state instruction information, it is sufficient to change only the state of the configuration or resource set indicated by the MAC CE. Because the base station does not need to include identification and instruction information in the MAC CE for configurations or resource sets that do not require change, it can also prevent unnecessary resource waste by the MAC CE.

[0123] For example, the terminal checks the identification information configured by the RRC message according to the identification information indicated by the MAC CE, and can change the state of the configuration or resource set indicated by the identification information to enabled or disabled. When the state is changed to enabled, the corresponding L1 measurement operation or L1 measurement reporting operation may be performed by the terminal.

[0124] Meanwhile, the MAC CE for indicating whether to activate the L1 measurement operation and the MAC CE for indicating whether to activate the L1 measurement reporting operation may be configured as different MAC CEs. Alternatively, in a single MAC CE, the L1 measurement reporting operation and the L1 measurement operation may be indicated simultaneously or separately depending on the identification target included in the identification information.

[0125] Through the aforementioned operation, when an LTM procedure for one or more candidate cells is configured in the terminal, frequent L1 measurement or measurement reporting operations of the terminal can be prevented. In addition, system overload can be reduced by minimizing MAC CE resources while the base station dynamically controls the terminal's L1 measurement or measurement reporting operations.

[0126] FIG. 9 is a diagram illustrating the operation of a base station according to one embodiment.

[0127] Referring to FIG. 9, a method (S900) for a base station to control a mobile operation of a terminal may include the step of transmitting an RRC message to the terminal that includes initial state indication information indicating an initial state of an L1 measurement operation or an L1 measurement reporting operation of the terminal in an LTM procedure (S910).

[0128] The base station may transmit configuration information for LTM procedure operation to the terminal via an RRC message. For example, the configuration information may be LTM configuration information. The LTM configuration information may include at least one of LTM candidate configuration, LTM CSI resource configuration, and LTM CSI reporting configuration. Additionally, the RRC message may be an RRC connection reconfiguration message.

[0129] LTM configuration information may include candidate cell information for the terminal to execute an LTM procedure, measurement information for L1 measurement, and reporting information for reporting L1 measurement results. LTM candidate configuration may include at least one of candidate cell information, measurement information, and reporting information. LTM CSI resource configuration may include CSI-RS resource set information that the terminal monitors and measures for L1 measurement. LTM CSI reporting configuration may include a reporting period, reporting resources, information included in the report, etc., for reporting L1 measurement results measured by the terminal.

[0130] The aforementioned LTM configuration information may include LTM candidate configurations, LTM CSI resource configurations, and LTM CSI reporting configurations, and the LTM candidate configurations, LTM CSI resource configurations, and LTM CSI reporting configurations may each be interconnected or configured in an inclusion relationship through any combination.

[0131] The RRC message may include initial state indication information to indicate the initial state of the terminal's L1 measurement operation or L1 measurement reporting operation.

[0132] For example, the initial state instruction information may include information indicating whether to initially enable an L1 measurement action or an L1 measurement reporting action for a set of CSI-RS resources associated with one or more of an LTM candidate configuration, an LTM CSI resource configuration, and an LTM CSI reporting configuration. As an example, the initial state instruction information may include information indicating whether to enable or disable an L1 measurement action or an L1 measurement reporting action for each set of CSI-RS resources for L1 measurement. As another example, the initial state instruction information may include information indicating whether to enable or disable an action for each LTM candidate configuration. As yet another example, the initial state instruction information may include information indicating whether to enable or disable an action for each LTM CSI resource configuration. As yet another example, the initial state instruction information may include information indicating whether to enable or disable an action for each LTM CSI reporting configuration.

[0133] One or more CSI-RS resource sets may be configured to be linked to at least one of an LTM candidate configuration, an LTM CSI resource configuration, and an LTM CSI reporting configuration. Here, being configured to be linked may mean that CSI-RS resource set information is included in the LTM candidate configuration, the LTM CSI resource configuration, or the LTM CSI reporting configuration. Additionally, being configured to be linked may include cases where the CSI-RS resource set and the LTM CSI reporting configuration are included in the LTM CSI resource configuration and configured at the same level. Alternatively, it may include cases where they are linked through specific identification information, etc.

[0134] Accordingly, the initial state indication information may explicitly or implicitly indicate the initial activation status of one or more CSI-RS resource sets associated with each by indicating whether to activate the LTM candidate configuration, LTM CSI resource configuration, and LTM CSI reporting configuration, respectively.

[0135] The terminal can store and configure information for the operation of the LTM procedure of the RRC message received from the base station. Based on the aforementioned initial state instruction information, the terminal can apply or configure the L1 measurement operation or L1 measurement reporting operation in the LTM procedure to an enabled or disabled state. For example, the terminal may store the information received via the RRC message, but regarding the execution of the L1 measurement operation based on each piece of information, it may apply it only to the CSI-RS resource set enabled according to the initial state instruction information. Alternatively, the terminal may store the information received via the RRC message, but regarding the execution of the L1 measurement reporting operation based on each piece of information, it may apply it only to the measurement reporting of the CSI-RS resource set enabled according to the initial state instruction information.

[0136] A method (S900) for a base station to control a mobile operation of a terminal may include the step of transmitting a MAC CE to the terminal indicating whether to activate an L1 measurement operation or an L1 measurement reporting operation (S920).

[0137] For example, a base station may transmit a MAC CE to dynamically indicate the activation status of an LTM procedure configured for a terminal. Although the initial state of an L1 measurement operation or an L1 measurement reporting operation is configured to be enabled or disabled according to the initial state instruction information of the terminal, the base station needs to instruct a change to the enabled state. To this end, the base station may transmit a MAC CE to the terminal to dynamically change the enabled or disabled state.

[0138] For example, MAC CE may include instruction information indicating whether to enable an L1 measurement operation or an L1 measurement reporting operation for a CSI-RS resource set associated with one or more of an LTM candidate configuration, an LTM CSI resource configuration, and an LTM CSI reporting configuration. Similar to initial state instruction information, the instruction information may also be configured to indicate whether to enable any one of the LTM candidate configuration, an LTM CSI resource configuration, an LTM CSI reporting configuration, and a CSI-RS resource set. However, since a CSI-RS resource set is associated with at least one of the LTM candidate configuration, an LTM CSI resource configuration, and an LTM CSI reporting configuration, the L1 measurement operation or an L1 measurement reporting operation associated with the CSI-RS resource set may be indicated whether to enable it explicitly or implicitly.

[0139] For example, the instruction information may include information indicating whether to enable per LTM candidate configuration, per LTM CSI resource configuration, or per LTM CSI reporting configuration. One or more CSI-RS resource sets are linked and configured for each LTM candidate configuration, each LTM CSI resource configuration, or each LTM CSI reporting configuration. Accordingly, for one or more CSI-RS resource sets, L1 measurement operations or L1 measurement reporting operations may be enabled or disabled depending on whether to enable according to the instruction information for each LTM candidate configuration, each LTM CSI resource configuration, or each LTM CSI reporting configuration.

[0140] The instructions based on MAC CE and the initial state instructions based on RRC messages can indicate whether to enable or disable the same level (LTM candidate configuration, LTM CSI resource configuration, LTM CSI reporting configuration, or CSI-RS resource set). Alternatively, the instructions based on MAC CE and the initial state instructions based on RRC messages can indicate whether to enable or disable the same level.

[0141] Meanwhile, MAC CE may be configured to be associated with periodic or event-triggered L1 measurement reporting operations. For example, an activation instruction via MAC CE may be applied only to periodic L1 measurement reporting operations. Alternatively, an activation instruction via MAC CE may be applied only to event-triggered L1 measurement reporting operations. In addition, an activation instruction based on the MAC CE's instruction information may be applied only under specific configuration conditions.

[0142] MAC CE may include at least one of LTM candidate configuration identification information, LTM CSI resource configuration identification information, LTM CSI reporting configuration identification information, cell identification information, CSI-RS resource set identification information, and instruction information indicating whether to enable L1 measurement operation or L1 measurement reporting operation.

[0143] For example, LTM candidate configuration identification information, LTM CSI resource configuration identification information, LTM CSI report configuration identification information, cell identification information, and CSI-RS resource set identification information can each be associated with corresponding identification information included in an RRC message. Through this, the terminal can determine which configuration or information configured in the terminal is indicated by the identification information of the MAC CE. Additionally, indication information can be set in correspondence with or associated with the identification information. The indication information can be composed of a 1-bit A / D field. That is, the indication information indicates whether the corresponding identification information is in an active or inactive state.

[0144] As described above, depending on the level at which activation is indicated, at least one of LTM candidate configuration identification information, LTM CSI resource configuration identification information, LTM CSI report configuration identification information, cell identification information, and CSI-RS resource set identification information may be included in MAC CE.

[0145] A method (S900) for a base station to control a mobile operation of a terminal may include the step of receiving a measurement result of an L1 measurement operation activated based on MAC CE from the terminal (S930).

[0146] The terminal changes the state of the configuration or resource set corresponding to the identification information indicated by the MAC CE to enabled or disabled. Since the state of the configuration or resource set is configured in the terminal according to the initial state instruction information, it is sufficient to change only the state of the configuration or resource set indicated by the MAC CE. Because the base station does not need to include identification and instruction information in the MAC CE for configurations or resource sets that do not require change, it can also prevent unnecessary resource waste by the MAC CE.

[0147] For example, the terminal checks the identification information configured by the RRC message according to the identification information indicated by the MAC CE, and can change the state of the configuration or resource set indicated by the identification information to enabled or disabled. When the state is changed to enabled, the corresponding L1 measurement operation or L1 measurement reporting operation may be performed by the terminal.

[0148] The base station can receive L1 measurement results of active candidate cells / LTM configurations / LTM CSI resources / CSI-RS resource sets through L1 measurements that are active at the terminal and the resulting L1 measurement reports.

[0149] Through the aforementioned operation, when an LTM procedure for one or more candidate cells is configured in the terminal, frequent L1 measurement or measurement reporting operations of the terminal can be prevented. In addition, system overload can be reduced by minimizing MAC CE resources while the base station dynamically controls the terminal's L1 measurement or measurement reporting operations.

[0150] Below, more diverse and detailed embodiments of operations performed by the terminal and the base station are described. For the embodiments described below, the operations of the terminal and the base station may be performed in any combination.

[0151]

[0152] L1 Beam Level Measurement Configuration Method

[0153] As described above, LTM is a procedure in which a base station receives L1 / L3 measurement results from a terminal and, based on these, changes the terminal's serving cell by a cell switch command signaled via MAC CE. In the LTM preparation phase included in the LTM procedure, the base station instructs the terminal to use an RRC reconfiguration message containing an LTM configuration (e.g., ltm-Config). The terminal performs the reconfiguration according to the fields of the received LTM configuration information elements. In the early synchronization phase (or before or after such phase), to select candidate beams and cells for early synchronization and / or candidate beams and cells for the LTM cell switch procedure, the terminal may perform L1 measurements on the configured LTM candidate cells. The terminal may transmit an L1 measurement report to the source cell / base station. L1 measurements and / or L1 reporting may be performed while the RRC reconfiguration containing the aforementioned LTM configuration is applicable.

[0154] For convenience of explanation, L1 beam level measurements performed within the LTM procedure will be referred to as L1 measurements below. Additionally, for convenience of explanation, MAC CE-based L1 (measurement / measurement result) reports / reporting (e.g., LTM L1 report, LTM L1 measurement report) will be referred to as L1 reporting. A measurement configuration for L1 measurements may be included in the LTM configuration. Alternatively, a measurement configuration for L1 measurements may be linked to the LTM configuration. A report configuration for L1 reporting may be included in the LTM configuration. Alternatively, a report configuration for L1 reporting may be linked to the LTM configuration.

[0155] In the following, the L1 measurement resource / resource set may refer to any SSB / CSI-RS resource / resource set. For the sake of convenience of explanation, even if one specific resource / resource set is described, it is obvious that the remaining resource / resource sets are also included within the scope of the present invention. For example, any resource / resource set included in the present invention may represent a non-zero-power (NZP) CSI-RS resource / resource set. Alternatively, any resource / resource set included in the present invention may represent a zero-power (ZP) CSI-RS resource / resource set. Alternatively, any resource / resource set included in the present invention may represent a periodic resource / resource set. Any resource / resource set included in the present invention may represent a semi-static resource / resource set. Any resource / resource set included in the present invention may represent a resource / resource set linked to MAC CE-based measurement reporting for the LTM procedure.

[0156] For example, resource configurations for L1 measurements can be included as sub-information elements (located directly within) the LTM configuration as common information for an LTM serving cell / configuration or one or more LTM candidate cells / configurations. This allows for the effective configuration of SSB resource / resource set configurations (e.g., LTM-SSB-ResourceSet) or CSI-RS resource / resource set configurations (e.g., LTM-CSI-RS-ResourceSet) for L1 measurements for one or more LTM candidate cells / configurations.

[0157] The LTM CSI resource configuration for the L1 measurement (e.g., LTM-CSI-ResourceConfig) may include one or more of the following: information for identifying the CSI resource configuration, information on the SSB resource set configuration, information on the CSI-RS resource set configuration, a list of the SSB resource set, and a list of the CSI-RS resource set.

[0158] The configuration of the corresponding SSB resource set may include a list of SSB indices (or SSBRI: SS / PBCH Block Resource indicators) included in the resource set and a list of LTM candidate configuration identification information (LTM-CandidateId).

[0159] The CSI-RS resource set configuration may include a list of CSI-RS indices (or CRIs: CSI-RS resource indicators) included in the resource set and a list of LTM candidate configuration identification information (LTM-CandidateIds).

[0160] The CSI-RS resource associated with the resource set configuration may be a different CSI-RS resource from the NZP (non-zero-power) CSI-RS resource according to the prior art that is reported through L1 signaling (e.g., UCI, PUCCH, PUSCH). Alternatively, the CSI-RS resource associated with the resource set configuration may be an NZP (non-zero-power) CSI-RS resource for MAC CE-based measurement reporting signaling.

[0161] As another example, resource configurations for L1 measurements can be included as sub-information elements (located directly) within LTM candidate cells / configurations (e.g., LTM-Candidate). This allows for the effective configuration of (NZP) CSI-RS resources (e.g., LTM-CSI-RS-ResourceConfig) and resource set configurations (e.g., LTM-CSI-RS-ResourceSet) for L1 measurements on a per-candidate cell basis.

[0162] For the L1 measurement, the corresponding LTM CSI resource configuration included in the corresponding candidate cell / configuration may include one or more pieces of information among information for identifying the corresponding CSI resource configuration, the corresponding CSI-RS resource type (e.g., periodic, semi-persistent), the corresponding CSI-RS resource set configuration information, and the corresponding CSI-RS resource set list.

[0163] The configuration of the CSI-RS resource set may include information on the list of CSI-RS indices (or CRIs: CSI-RS resource indicators) included in the resource set. The list of CSI-RS resource sets may include one or more (NZP) CSI-RS resource set identifications.

[0164] The CSI-RS resource associated with the resource set may be a different CSI-RS resource from the NZP (non-zero-power) CSI-RS resource according to the prior art that is reported through L1 signaling (e.g., UCI, PUCCH, PUSCH). Alternatively, the CSI-RS resource associated with the resource set may be an NZP (non-zero-power) CSI-RS resource for MAC CE-based measurement reporting signaling.

[0165] As another example, to reduce the L1 measurement target CSI / SSB / CSI-RS resources in the corresponding L1 measurement, sub / subset / part of the corresponding CSI / SSB / CSI-RS resource configuration can be distinguished.

[0166] For example, a single CSI-RS resource configuration can be divided into one or more CSI-RS subset resource configurations. The CSI-RS resources included in each CSI-RS subset resource may consist of the CSI-RS resources included in the corresponding CSI-RS resource configuration. The CSI-RS resources included in each CSI-RS subset resource may consist of CSI-RS resources that are exclusive or non-overlapping between the respective subsets. For example, a specific or arbitrary CSI-RS resource may be included in or associated with only one CSI-RS subset resource.

[0167] Alternatively, the CSI-RS resources included in each CSI-RS subset resource may consist of CSI-RS resources that overlap between each subset. For example, a specific / arbitrary CSI-RS resource may be included in / associated with one or more CSI-RS subset resources.

[0168] The corresponding CSI-RS subset resource configuration (and / or the corresponding CSI-RS subset resource set configuration) can be instructed to the terminal. For the sake of convenience of explanation, this is referred to as "sub CSI-RS resource configuration / resource set configuration" below. This is for the sake of convenience of explanation and may be replaced with any other name.

[0169] A sub-CSI-RS resource configuration / resource set configuration may include one or more of the following: information for identifying the sub-CSI-RS resource configuration / resource set configuration (or a list of information for identifying the sub-CSI-RS resource configuration / resource set configuration), the sub-CSI-RS resource type (e.g., periodic, semi-static), information for identifying the CSI-RS resource / resource configuration to which the sub-CSI-RS resource configuration / resource set configuration is included / associated with, the sub-CSI-RS resource set configuration information, the sub-CSI-RS resource set list information, and the sub-CSI-RS parameters. The sub-CSI-RS resource set list may include one or more of the following: a list of information for identifying NZP-CSI-RS resource sets (e.g., NZP-CSI-RS-ResourceSetId), a list of information for identifying SSB resource sets (e.g., SSB-ResourceSetId), and the UL / DL BWP-ID. The corresponding sub CSI-RS parameter may represent the parameter used for the corresponding L1 report configuration (e.g., LTM CSI report (sub) configuration). For example, the associated parameters related to the antenna port subset and the corresponding sub configuration (e.g.It may include one or more of the following: CodebookConfig applicable to the ports indicated by the port subset indicator; a port subset indicator indicating a (sub)set of CSI-RS antenna ports used for CSI calculation in the corresponding subconfiguration; poweroffset (When powerControlOffset is configured in NZP CSI-RS resources in the resource set for channel measurement associated with the CSI-ReportConfig, the power offset of PDSCH EPRE to NZP CSI-RS EPRE is equal to powerControlOffset - powerOffset); a list of NZP CSI-RS resources for the sub-configuration that is a (sub)set of NZP CSI-RS resource(s) of the CSI-RS resource set for channel measurement associated with the sub-configuration in the CSI report configuration); and a list of NZP CSI-RS resources / resource sets for the corresponding subconfiguration.

[0170] As another example, to reduce the L1 measurement target CSI / SSB / CSI-RS resources in the corresponding L1 measurement, sub / subset / part of the corresponding CSI / SSB / CSI-RS resource set configuration can be distinguished.

[0171] For example, a single CSI-RS resource set configuration can be divided into one or more CSI-RS subset resource set configurations. Each CSI-RS subset resource set configuration may be composed of CSI-RS resources / index(s) included in that CSI-RS resource set configuration. Each CSI-RS subset resource set configuration may include list information of CSI-RS indices (or CRI: CSI-RS resource indicators) included in that resource set. The CSI-RS index(s) included in each CSI-RS subset resource set may consist of CSI-RS index(s) that are exclusive or non-overlapping between each subset resource set configuration. For example, a specific or arbitrary CSI-RS index may be included in or associated with only one CSI-RS subset resource set.

[0172] Alternatively, CSI-RS index(s) included in each CSI-RS subset resource set may be configured to be included redundantly across each subset. For example, a specific / arbitrary CSI-RS index(s) may be included in / associated with one or more CSI-RS subset resource sets.

[0173] The corresponding CSI-RS subset resource set configuration can be instructed to the terminal. For the sake of convenience of explanation, this will be referred to as the "sub CSI-RS resource set configuration" below. This is for the sake of convenience and may be replaced with any other name.

[0174] A sub-CSI-RS resource set configuration may include one or more of the following: information for identifying the sub-CSI-RS resource set configuration (or a list of information for identifying the sub-CSI-RS resource set configuration), the type of the sub-CSI-RS resource set (or the resource containing the resource set) (e.g., periodic, semi-static), a list of CSI-RS indices (or CRI: CSI-RS resource indicators) included in the sub-CSI-RS resource set, information for identifying the CSI-RS resource set containing / associated with the sub-CSI-RS resource set (e.g., NZP-CSI-RS-ResourceSetId), a list of information for identifying the NZP-CSI-RS resource set included in the sub-CSI-RS resource set (e.g., NZP-CSI-RS-ResourceSetId), a list of information for identifying the SSB resource set included in the sub-CSI-RS resource set (e.g., SSB-ResourceSetId), the BWP-ID, and the sub-CSI-RS parameters. The corresponding sub CSI-RS parameter may represent the parameter used for the corresponding L1 report configuration (e.g., LTM CSI report (sub) configuration). For example, the associated parameters related to the antenna port subset and the corresponding sub configuration (e.g.It may include one or more of the following: CodebookConfig applicable to the ports indicated by the port subset indicator; a port subset indicator indicating a (sub)set of CSI-RS antenna ports used for CSI calculation in the corresponding subconfiguration; poweroffset (When powerControlOffset is configured in NZP CSI-RS resources in the resource set for channel measurement associated with the CSI-ReportConfig, the power offset of PDSCH EPRE to NZP CSI-RS EPRE is equal to powerControlOffset - powerOffset); a list of NZP CSI-RS resources for the sub-configuration that is a (sub)set of NZP CSI-RS resource(s) of the CSI-RS resource set for channel measurement associated with the sub-configuration in the CSI report configuration); and a list of NZP CSI-RS resources / resource sets for the corresponding subconfiguration.

[0175] As another example, the corresponding sub-CSI / SSB / CSI-RS resource / resource set configuration can be instructed to the terminal. For example, if the sub-CSI / SSB / CSI-RS resource / resource set configuration associated with the L1 measurement has L sub-configurations, the terminal can be instructed to include a list of information for identifying M sub-configurations among the L configured sub-configurations in the CSI-RS subset resource / resource set configuration associated with the L1 measurement. This instruction information can be provided via a bitmap / bitstring of size L or a Boolean sequence of size L. The bit / Boolean index / sequence for this instruction information can be determined by the ascending (or descending) order of the corresponding CSI-RS subset resource / resource identification information. When the corresponding bit / boolean is set to 1 (or 0) / True (or false) / setup / enable, the terminal can set up / configure / set / save / enable the corresponding sub CSI / SSB / CSI-RS resource / resource set configuration. The terminal can perform / initiate / enable the corresponding L1 measurement according to the corresponding sub CSI / SSB / CSI-RS resource / resource set configuration.

[0176] As another example, one or more CSI / SSB / CSI-RS resource / resource set configurations may be instructed to the terminal. For example, if there are L CSI-RS resource / resource set configurations associated with the L1 measurement, the terminal may be instructed to include a list of information to identify M configurations among the L CSI-RS resource / resource set configurations associated with the L1 measurement. This instruction information may be provided via a bitmap / bitstring of size L or a Boolean sequence of size L. The bit / Boolean index / sequence for this instruction information may be determined by the ascending (or descending) order of the CSI-RS subset resource / resource identification information. When the bit / Boolean is set to 1 (or 0) / True (or false) / setup / enable, the terminal may set up / configure / set / save / enable the CSI / SSB / CSI-RS resource / resource set configuration. The terminal can perform / initiate / activate the corresponding L1 measurement according to the configuration of the corresponding CSI / SSB / CSI-RS resource / resource set.

[0177]

[0178] Method to enable / disable measurement resources

[0179] An RRC message for the L1 measurement may be directed to the terminal. The RRC message may include one or more periodic / semistatic CSI / SSB / CSI-RS resource / resource set configurations for one or more candidate cells / configurations. Alternatively, the RRC message may include one or more periodic / semistatic sub-CSI / SSB / CSI-RS resource / resource set configurations for one or more candidate cells / configurations. In the following, the CSI / SSB / CSI-RS resource / resource set configuration may represent a sub-CSI / SSB / CSI-RS resource / resource set configuration. Alternatively, in the following, the CSI / SSB / CSI-RS resource / resource set configuration may represent a standard CSI / SSB / CSI-RS resource / resource set configuration.

[0180] The terminal can initiate / perform / enable / resume / stop / release / disable / suspend / disable the L1 measurement based on the corresponding CSI / SSB / CSI-RS resource / resource set configuration according to the instructions of the corresponding base station.

[0181] For example, when receiving an RRC reconfiguration message containing the relevant RRC configuration, the terminal can perform / start / initiate L1 measurements based on the relevant CSI / SSB / CSI-RS resource / resource set configuration. For example, when directed by the relevant (associated) L1 reporting configuration, the terminal can perform / start / initiate L1 measurements based on the relevant CSI / SSB / CSI-RS resource / resource set configuration.

[0182] As another example, when receiving an RRC reconfiguration message containing the corresponding RRC configuration, the terminal can perform / start / initiate L1 measurements based on the corresponding CSI / SSB / CSI-RS resource / resource set configuration. For example, when the report type / report configuration type for the (associated) L1 reporting configuration is set to a specific report / report configuration type (e.g., eventTriggered, periodic, semiPersistentOnPUCCH, semiPersistentOnPUSCH, apreriodic, or one or more thereof), when the number of L1 reports to be transmitted for the corresponding report is less than a specific value, when any / specific condition (e.g., eventLTM2, eventLTM2, eventLTM2, eventLTM2, or one or more of a threshold) instructed / configured to the terminal by the base station is satisfied / implemented, or when the configuration / instruction information is set to setup / true / enabled and instructed / configured in one or more of the following cases, the terminal can perform / start / initiate L1 measurements based on the corresponding CSI / SSB / CSI-RS resource / resource set configuration.

[0183] For reference, the LTM events are as follows.

[0184] -Event LTM2: Beam of serving cell becomes worse than absolute threshold;

[0185] - Event LTM3: Beam of candidate cell becomes amount of offset better than beam of serving cell;

[0186] - Event LTM4: Beam of candidate cell becomes better than absolute threshold;

[0187] - Event LTM5: Beam of serving cell becomes worse than absolute threshold1 AND Beam of candidate cell becomes better than another absolute threshold2.

[0188]

[0189] As another example, when receiving an RRC reconfiguration message containing the relevant RRC configuration, the terminal may save the RRC configuration. The terminal may consider the L1 measurement to be disabled based on the relevant CSI / SSB / CSI-RS resource / resource set configuration. When the terminal receives signaling (e.g., MAC CE) from the base station to enable the L1 measurement, it may perform / start / initiate / enable the L1 measurement.

[0190] As another example, when receiving an RRC reconfiguration message containing the relevant RRC configuration, the terminal may store the relevant RRC configuration. The terminal may include information to indicate whether the relevant CSI / SSB / CSI-RS resource / resource set configuration is enabled or disabled. Based on the indicated information, the terminal may consider the CSI / SSB / CSI-RS resource / resource set configuration associated with the relevant L1 measurement as being enabled or disabled. Based on the indicated information, the terminal may consider the L1 measurement status associated with the CSI / SSB / CSI-RS resource / resource set configuration associated with the relevant L1 measurement as being enabled or disabled. Based on the relevant CSI / SSB / CSI-RS resource / resource set configuration according to the indicated information, the terminal may perform, start, initiate, or enable the relevant L1 measurement.

[0191] As another example, when receiving an RRC reconfiguration message containing the relevant RRC configuration, the terminal may store the relevant RRC configuration. The terminal may include information to indicate whether the L1 measurement for the relevant candidate cell / configuration containing the relevant CSI / SSB / CSI-RS resource / resource set configuration is enabled or disabled. Based on the indicated information, the terminal may consider the relevant L1 measurement (or the CSI / SSB / CSI-RS resource / resource set configuration associated with the relevant L1 measurement) for the relevant candidate cell / configuration as enabled or disabled. Based on the indicated information, the terminal may consider the relevant L1 measurement status for the relevant candidate cell as enabled or disabled. Depending on whether the L1 measurement for the relevant candidate cell / configuration is enabled or disabled, the terminal may perform / initiate / enable / restart / stop / release / disable / suspend / disable the relevant L1 measurement for the relevant candidate cells (based on the relevant CSI / SSB / CSI-RS resource / resource set configuration).

[0192] As another example, when receiving an RRC reconfiguration message containing the RRC configuration, the terminal may store the RRC configuration. The terminal may include information for indicating whether the L1 measurement for the corresponding candidate cell / configuration containing the corresponding CSI / SSB / CSI-RS resource / resource set configuration is enabled / disabled, and information for indicating whether the CSI / SSB / CSI-RS resource / resource set configuration is enabled / disabled within the corresponding / each candidate cell configuration.

[0193] If the activation of an L1 measurement for a specific candidate cell / configuration is indicated, the terminal may consider the CSI / SSB / CSI-RS resource / resource set configuration associated with the L1 measurement as being in an enabled / disabled state according to information indicating whether the corresponding CSI / SSB / CSI-RS resource / resource set configuration is enabled / disabled. Based on the corresponding CSI / SSB / CSI-RS resource / resource set configuration according to the indication information, the terminal may perform / initiate / enable / resume / stop / release / disable / suspend / disable the L1 measurement.

[0194] If the disablement of an L1 measurement for a specific candidate cell / configuration is indicated, the terminal may consider the CSI / SSB / CSI-RS resource / resource set configuration associated with the L1 measurement for that candidate cell / configuration to be in a disabled state, regardless of information indicating whether the corresponding CSI / SSB / CSI-RS resource / resource set configuration is enabled or disabled. The terminal may stop / release / disable / suspend / disable the corresponding L1 measurement for that candidate cell / configuration.

[0195] As another example, the terminal may select a subset of CSI-RS resources or resource sets to perform / start / initiate / activate the corresponding L1 measurement according to instructions from the base station. For example, upon receiving an RRC reconfiguration message containing the corresponding RRC configuration, the terminal may configure the L1 measurement for the corresponding subset of CSI-RS resources to be disabled. Alternatively, upon receiving an RRC reconfiguration message containing the corresponding RRC configuration, the terminal may store the L1 measurement for the corresponding subset of CSI-RS resources according to the corresponding RRC configuration in a disabled state. Or, upon receiving an RRC reconfiguration message containing the corresponding RRC configuration, the terminal may configure / store the L1 measurement for the corresponding subset of CSI-RS resources according to the corresponding RRC configuration in an enabled / disabled state based on information indicating whether the L1 measurement for the corresponding subset of CSI-RS resources is enabled. When a terminal receives signaling (e.g., MAC CE) from a base station to enable / disable L1 measurements for a subset of the corresponding CSI-RS resources, it can perform / start / initiate / enable / resume / stop / release / disable / suspend / disable the L1 measurements according to the information received from the MAC CE.

[0196]

[0197] As another example, the base station can enable / disable the corresponding L1 measurement resources / resource sets configured in one or more candidate cell(s). For example, it can enable / disable periodic / semistatic ZP / NZP CSI-RS resource sets configured by defining the corresponding MAC CE and transmitting it to the terminal.

[0198] The configuration can be configured on the terminal through resource / resource set configuration information associated with the L1 measurement. The configured periodic / semistatic ZP / NZP CSI-RS resource set may be initially disabled when the terminal is configured / reconfigured upon receiving an RRC reconfiguration message, and / or after the terminal performs an L3 handover (reconfiguration with sync) upon receiving an RRC reconfiguration message containing reconfiguration with sync (L3 handover command).

[0199] When a terminal (or a terminal's MAC entity) receives a corresponding MAC CE on a serving cell, the terminal (or a terminal's MAC entity) can direct information regarding the corresponding MAC CE to the physical layer.

[0200] As another example, the base station can enable / disable the corresponding L1 measurement sub-resources / resource sets configured in one or more candidate cell(s). For example, it can enable / disable periodic / semistatic ZP / NZP sub-CSI-RS resources / resource sets configured by defining the corresponding MAC CE and transmitting it to the terminal.

[0201] The base station can enable / disable at least one of the configured sub-configuration of a configured Periodic / Semi-Persistent resource / resource-set by transmitting the corresponding MAC CE.

[0202] The configuration may be configured in the terminal through resource / resource set subconfiguration information associated with the corresponding L1 measurement. For each periodic / semistatic CSI / SSB / CSI-RS resource / resource set configured with the corresponding CSI / SSB / CSI-RS resource / resource set subconfiguration information, the base station may disable all configured subconfigurations by transmitting the corresponding MAC CE. The configured periodic / semistatic CSI / SSB / CSI-RS resource / resource set may be initially disabled when the terminal is configured / reconfigured upon receiving an RRC reconfiguration message, and / or after the terminal performs an L3 handover (reconfiguration with sync) upon receiving an RRC reconfiguration message containing reconfiguration with sync (L3 handover command).

[0203] When a terminal (or a terminal's MAC entity) receives a corresponding MAC CE on a serving cell, the terminal (or a terminal's MAC entity) can direct information regarding the corresponding MAC CE to the physical layer.

[0204] As another example, the base station can enable / disable the corresponding L1 measurements configured in one or more candidate cell(s). For example, the corresponding L1 measurements configured in the corresponding candidate cell(s) can be enabled / disabled by defining the corresponding MAC CE and transmitting it to the terminal.

[0205] As another example, MAC CEs can be defined and used to perform, start, enable, resume, stop, release, disable, suspend, or disable the corresponding CSI / SSB / CSI-RS resources / resource sets in the serving cell for the relevant L1 measurement. MAC CEs can be defined and used to perform, start, enable, resume, stop, release, disable, suspend, or disable the corresponding CSI / SSB / CSI-RS resources / resource sets in the candidate cell / configuration for the relevant L1 measurement. MAC CEs can be defined and used to enable or disable L1 measurements based on the corresponding CSI / SSB / CSI-RS resources / resource sets. MAC CE can be defined and used to perform, start, initiate, enable, resume, stop, release, disable, or suspend L1 measurements based on the corresponding CSI / SSB / CSI-RS resources / resource sets.

[0206] As another example, the aforementioned MAC CE includes information to indicate the enabled / disabled status of the corresponding CSI / SSB / CSI-RS resources / resource sets (and / or sub-CSI / SSB / CSI-RS resources / resource sets) for the corresponding candidate / serving cell configuration (e.g., a 1-bit A / D field), information to identify the candidate / serving cell to which the MAC CE applies (e.g., a 5-bit serving cell ID / ServCellIndex, physical cell ID), information to identify the candidate configuration to which the MAC CE applies (e.g., ltm-CandidateId, Target Configuration ID: ltm-CandidateId - 1), a 2-bit DL BWP-ID to which the MAC CE applies (based on the code point of the DCI bandwidth part indicator field), identification information for the corresponding CSI / SSB / CSI-RS resources / resource sets (and / or sub-CSI / SSB / CSI-RS resources / resource sets), (the corresponding CSI / SSB / CSI-RS resources / resource sets (and / or sub- It may include one or more TCI state IDs of TCI states used as QCL sources within the corresponding CSI / SSB / CSI-RS resource / resource set (and / or sub CSI / SSB / CSI-RS resource / resource set) indicated by the identification information field.

[0207] As another example, the aforementioned MAC CE may include one or more of the following: information for indicating whether the CSI / SSB / CSI-RS resource / resource set (and / or sub CSI / SSB / CSI-RS resource / resource set) for the corresponding candidate / serving cell / configuration is enabled / disabled (e.g., a 1-bit A / D field); information for identifying the candidate / serving cell to which the MAC CE applies (e.g., a 5-bit serving cell id / ServCellIndex, physical cell id); information for identifying the candidate configuration to which the MAC CE applies (e.g., ltm-CandidateId, Target Configuration ID: ltm-CandidateId - 1); and a 2-bit DL BWP-ID (or UL BWP-ID) to which the MAC CE applies according to the code point of the DCI bandwidth part indicator field.

[0208] As another example, the aforementioned MAC CE can be made to have a variable size. This allows it to direct the activation / deactivation of one or more resources / resource sets.

[0209] As another example, the aforementioned MAC CE can be made to have a fixed size. This allows for a reduction in processing overhead at the terminal and base station.

[0210] As another example, the aforementioned MAC CE includes information to indicate whether the corresponding L1 measurement for the corresponding candidate cell / configuration is enabled, the number of corresponding CSI / SSB / CSI-RS resources / resource sets included in the MAC CE, information to indicate whether the corresponding CSI / SSB / CSI-RS resources / resource sets (and / or sub-CSI / SSB / CSI-RS resources / resource sets) are enabled / disabled, information to indicate whether the lift configuration / report subconfiguration included in the corresponding L1 report configuration (or the corresponding L1 report subconfiguration) is enabled / disabled, information to indicate whether the CSI / SSB / CSI-RS resources / resource sets (and / or sub-CSI / SSB / CSI-RS resources / resource sets) are enabled / disabled, information to identify the corresponding CSI / SSB / CSI-RS resource configuration, information to identify the corresponding CSI / SSB / CSI-RS resource set configuration, information to identify the corresponding sub-CSI / SSB / CSI-RS resource configuration, and the corresponding sub It may include one or more of the following information: information for identifying a CSI / SSB / CSI-RS resource set configuration, the corresponding CSI-RS index (or CRI: CSI-RS resource indicator), identification information for a candidate cell / configuration of the corresponding CSI / SSB / CSI-RS resource / resource set configuration, identification information for an associated CSI / SSB / CSI-RS report, the corresponding event LTM information, the corresponding threshold, the corresponding serving / candidate cell ID to which the corresponding MAC CE applies, the corresponding candidate configuration ID to which the corresponding MAC CE applies, a list of corresponding candidate cell / configuration IDs to which the corresponding MAC CE applies, and the corresponding BWP-ID to which the corresponding MAC CE applies.

[0211] As another example, the aforementioned MAC CE may include one or more pieces of information, such as information for indicating whether the corresponding L1 measurement for the corresponding candidate cell / configuration is enabled, and identification information for the corresponding cell / configuration to which the MAC CE is applied.

[0212] The i-th bit of the field indicating whether the corresponding L1 measurement for the corresponding candidate cell / configuration is enabled may be determined according to the ascending (or descending) order of the configured candidate cell / configuration identifiers. For example, the first bit (e.g., i=0) may be for the candidate cell / configuration having the lowest corresponding candidate cell / configuration identifier. The second bit (i=1) may be for the candidate cell / configuration having the second lowest corresponding candidate cell / configuration identifier. (Alternatively, the first bit (e.g., i=0) may be for the cell / configuration of the serving cell. The second bit (i=1) may be for the candidate cell / configuration having the lowest corresponding candidate cell / configuration identifier excluding the serving cell.)

[0213] If the bit in the corresponding field is set to 0, the L1 measurement (or corresponding L1 measurement configuration) of the corresponding candidate cell may be disabled. If the bit in the corresponding field is set to 1, the L1 measurement (or corresponding L1 measurement configuration) of the corresponding candidate cell may be enabled. Considering that the maximum number of LTM candidate configurations is 8, the corresponding field may be (pre)configured / specified with a fixed number of bits less than or equal to 8 (e.g., 4, 8). Alternatively, the corresponding field may be (pre)configured / specified with 16 or 32 bits to enable configurations for more cells, including SCells, in addition to the LTM candidate configurations. Alternatively, the number of bits in the corresponding field may be instructed to the base station via the corresponding RRC message. This allows the base station to configure the number of corresponding cells to be included in the corresponding MAC CE. Alternatively, the corresponding field may be (pre)configured / specified with a specific fixed value shorter than 64 bits (e.g., 4). This can reduce the overhead for such processing.

[0214] Identification information for the cell / configuration to which the MAC CE applies can be distinguished through at least one of information for identifying the candidate / serving cell (e.g., 5-bit serving cell ID / ServCellIndex, physical cell ID) and information for identifying the candidate configuration to which the MAC CE applies (e.g., ltm-CandidateId, Target Configuration ID: ltm-CandidateId - 1).

[0215] As another example, an information field indicating whether the corresponding L1 measurement is enabled for the candidate cell / configuration to which the MAC CE applies may have a fixed-size value. If the number of corresponding candidate cells / configurations in the list included in the RRC message is less than that fixed value (e.g., i + 1), the terminal may be instructed to ignore the i-th bit / field. This prevents the terminal from performing unnecessary actions.

[0216] As another example, the aforementioned MAC CE may include information to indicate whether the corresponding CSI / SSB / CSI-RS resource / resource set (and / or sub-CSI / SSB / CSI-RS resource / resource set) is enabled or disabled. The i-th bit of the corresponding field may be determined according to the ascending (or descending) order of the configured resource / resource set identification information (and / or sub-resource / resource set identification information). If the bit of the corresponding field is set to 0, the corresponding configuration may be disabled. If the bit of the corresponding field is set to 1, the corresponding configuration may be enabled. The corresponding field may be (pre)configured / specified with 112 bits, considering that the maximum number of LTM CSI resource configurations is 112. Alternatively, the corresponding field may be (pre)configured / specified with 64 bits, considering that the maximum number of NZP-CSI-RS resource set configurations is 64. Alternatively, the number of bits in the corresponding field may be indicated to the base station via the corresponding RRC message. This allows the base station to configure the number of CSI / SSB / CSI-RS resources / resource sets to be included in the corresponding MAC CE. Alternatively, the field can be (pre)configured / specified to specific fixed values ​​shorter than 64 bits (e.g., 4, 8, 16, 32). This can reduce the overhead for such processing.

[0217] As another example, the aforementioned MAC CE may include information to indicate the enabled / disabled status of the corresponding CSI / SSB / CSI-RS resource / resource set (and / or sub-CSI / SSB / CSI-RS resource / resource set) for each corresponding candidate cell / configuration. The i-th and j-th bits of the corresponding field may be determined for i / j based on the ascending (or descending) order of the i-th configured candidate cell / configuration identification information and the ascending (or descending) order of the j-th configured resource / resource set identification information (and / or sub-resource / resource set identification information). If the bit of the corresponding field is set to 0, the corresponding configuration may be disabled. If the bit of the corresponding field is set to 1, the corresponding configuration may be enabled.

[0218] The field may be configured with bits having the maximum number of candidate cells / configurations * the maximum number of resource / resource set configurations, considering one or more of the maximum number of LTM candidate cells / configurations, the maximum number of LTM CSI resource configurations, and the maximum number of NZP-CSI-RS resource set configurations. Alternatively, the number of bits in the field may be specified to the base station via the corresponding RRC message. Alternatively, this may allow the base station to configure the number of bits to include. The number of bits may be specified through a single field / parameter. Alternatively, the number of bits may be specified through two fields / parameters (number of cells, number of resources / resource sets). Alternatively, the field may be (pre)configured / specified with a short, specific fixed value (e.g., number of cells 4, number of resources / resource sets 4). This allows the overhead for processing to be reduced to 16 bits.

[0219] As another example, the aforementioned MAC CE includes, in addition to information indicating the enabled / disabled status of the corresponding CSI / SSB / CSI-RS resources / resource sets (and / or sub-CSI / SSB / CSI-RS resources / resource sets) for each candidate cell / configuration, information to identify the candidate / serving cell to which the MAC CE applies (e.g., 5-bit serving cell ID / ServCellIndex, physical cell ID), information to identify the candidate configuration to which the MAC CE applies (e.g., ltm-CandidateId, Target Configuration ID: ltm-CandidateId - 1), a 2-bit DL BWP-ID (or UL BWP-D) to which the MAC CE applies based on the code point of the DCI bandwidth part indicator field, identification information for the corresponding CSI / SSB / CSI-RS resources / resource sets (and / or sub-CSI / SSB / CSI-RS resources / resource sets), and information to identify the corresponding CSI / SSB / CSI-RS resources / resource sets (and / or sub-CSI / SSB / CSI-RS It may include one or more TCI state IDs of TCI states used as QCL sources within the corresponding CSI / SSB / CSI-RS resource / resource set (and / or sub CSI / SSB / CSI-RS resource / resource set) indicated by the resource / resource set) identification information field.

[0220]

[0221] As another example, the aforementioned MAC CE may include one or more of the following information: information for indicating whether the corresponding CSI / SSB / CSI-RS resource / resource set (and / or sub CSI / SSB / CSI-RS resource / resource set or the corresponding L1 measure) is enabled or disabled for the corresponding candidate / serving cell / configuration, and information for indicating whether the corresponding CSI / SSB / CSI-RS resource / resource set (and / or sub CSI / SSB / CSI-RS resource / resource set) is enabled or disabled per corresponding candidate cell / configuration.

[0222] As another example, regarding information for indicating the enabled / disabled status of the corresponding CSI / SSB / CSI-RS resources / resource sets (and / or sub-CSI / SSB / CSI-RS resources / resource sets or their L1 measurements) for the corresponding candidate / serving cell / configuration, the i-th bit of the corresponding field may be determined according to the ascending (or descending) order of the configured candidate cell / configuration identifiers. For example, the first bit (e.g., i=0) may be for the candidate cell / configuration having the lowest corresponding candidate cell / configuration identifier. The second bit (i=1) may be for the candidate cell / configuration having the second lowest corresponding candidate cell / configuration identifier. (Alternatively, the first bit (e.g., i=0) may be for the cell / configuration of the serving cell. The second bit (i=1) may be for the candidate cell / configuration having the lowest corresponding candidate cell / configuration identifier, excluding the serving cell.)

[0223] As another example, if information for indicating whether the corresponding CSI / SSB / CSI-RS resource / resource set (and / or sub CSI / SSB / CSI-RS resource / resource set or the corresponding L1 measurement) for the corresponding candidate / serving cell / configuration has a fixed value (e.g., 4), and the size (e.g., number of bits) of the field for indicating the activation / deactivation of the corresponding CSI / SSB / CSI-RS resource / resource set (and / or sub CSI / SSB / CSI-RS resource / resource set) configuration x for the corresponding candidate / serving cell / configuration identifier i has a fixed value (e.g., 8), then if the bit / field for indicating the activation / deactivation status of the corresponding L1 measurement within the i-th candidate / serving cell / configuration is set to enabled (e.g., 1), then for the corresponding i,x bit / field, there may be an i,x bit / field such that x=0, 1, 2, 3, 4, 5, 6, 7. If a bit / field indicating the enabled / disabled state of the corresponding L1 measurement within the i-th corresponding candidate / serving cell / configuration is set to disabled (e.g., 0), then for the corresponding i,x bit / field, for example, x=0, 1, 2, 3, 4, 5, 6, 7, the i,x bit / field may not exist. For disabled candidate cells / configurations, the corresponding L1 report configuration may also be disabled, so the bit / field may not exist.

[0224] As another example, if the number of corresponding L1 measurement subconfigurations in the list of L1 measurement subconfigurations included in the RRC message is less than the fixed value (e.g., x + 1), the terminal can be configured to ignore the i-th and x-th bits / fields. This prevents the terminal from performing unnecessary operations.

[0225] As another example, if the number of corresponding L1 measurement subconfigurations within the list of candidate cells / configurations included in the RRC message is less than the corresponding fixed value (e.g., x + 1), the terminal can be instructed to ignore the i-th and x-th bits / fields. This prevents the terminal from performing unnecessary operations.

[0226] As another example, the aforementioned MAC CE may be provided through one or more MAC CEs having different LCIDs / eLCIDs. For example, a MAC CE with 8 bits of information indicating whether the corresponding L1 measurement for the corresponding candidate cell / configuration is enabled, and a MAC CE with 16 / 32 bits of information indicating whether the corresponding L1 measurement for the corresponding candidate cell / configuration is enabled, may be defined and used. Alternatively, a MAC CE with a specific number of bits of information indicating whether the corresponding L1 measurement for the corresponding candidate cell / configuration is enabled, and a MAC CE with another specific number of bits of information indicating whether the corresponding L1 measurement for the corresponding candidate cell / configuration is enabled, may be defined and used. Alternatively, a MAC CE with a specific number of bits and a MAC CE with another specific number of bits may be defined and used. Alternatively, it may include a MAC CE for indicating whether the corresponding L1 measurement for a candidate cell / configuration is enabled, and a MAC CE for indicating whether the corresponding CSI / SSB / CSI-RS resource / resource set (and / or sub-CSI / SSB / CSI-RS resource / resource set) is enabled / disabled. Alternatively, it may include a MAC CE for indicating whether the corresponding L1 measurement for a candidate cell / configuration is enabled, and a MAC CE for indicating whether the corresponding L1 measurement subconfiguration included in / associated with the corresponding L1 measurement configuration for the candidate cell / configuration is enabled. Alternatively, it may include a MAC CE for indicating whether the corresponding L1 measurement for a single candidate cell / configuration is enabled, and a MAC CE for indicating whether the corresponding L1 measurement for one or more candidate cells / configurations is enabled.

[0227] As another example, the aforementioned MAC CE may include information to indicate the enabled / disabled status of the corresponding CSI / SSB / CSI-RS resource / resource set (and / or sub-CSI / SSB / CSI-RS resource / resource set) for each corresponding candidate cell / configuration. The i-th and j-th bits of the corresponding field may be determined for i / j according to the ascending (or descending) order of the i-th configured candidate cell / configuration identification information and the ascending (or descending) order of the j-th configured resource / resource set identification information (and / or sub-resource / resource set identification information).

[0228] Various embodiments related to measurement have been described above. Below, embodiments related to reporting operations are described.

[0229]

[0230] L1 Beam Level Measurement Result Reporting Method

[0231] As described above, LTM is a procedure in which a base station receives L1 / L3 measurement result reports from a terminal and, based on these, changes the terminal's serving cell by a cell switch command signaled via MAC CE. In the LTM preparation phase included in the LTM procedure, the base station instructs the terminal to receive an RRC reconfiguration message containing an LTM configuration (e.g., ltm-Config). The terminal performs the reconfiguration according to the fields of the received LTM configuration information elements. In the early synchronization phase (or before or after such phase), to select candidate beams and cells for early synchronization and / or candidate beams and cells for the LTM cell switch procedure, the terminal may perform L1 measurement / reporting for the configured LTM candidate cells. The terminal may transmit the L1 measurement report to the source / serving cell / base station. L1 measurement / reporting may be performed while the RRC reconfiguration containing the aforementioned LTM configuration is applicable.

[0232] The base station may be configured to allow the RRC-connected terminal to perform L1 beam level measurements for LTM candidate cells. The base station may be configured to allow the terminal to report L1 measurement results according to the L1 event-triggered beam level measurement configuration. The measurement results may be used to instruct the serving base station on the L1 beam level measurement results of the serving cell and / or candidate cells when the corresponding L1 event trigger condition is satisfied.

[0233] The base station can be configured to report measurement results per SS / PBCH block and SS / PBCH block(s) resource indicator (SSBRI) based on the SS / PBCH block(s). The base station can be configured to report measurement results per CSI-RS resource indicator (CRI) based on the CSI-RS resources.

[0234] The base station can instruct / configure the corresponding configuration to the terminal via RRC messages (e.g., RRC reconfiguration). For example, it can instruct / configure the corresponding L1 measurement by defining parameters within the LTM-CSI-ResourceConfig.

[0235] As another example, the corresponding parameter can be defined and configured within the LTM CSI Report Configuration (LTM-CSI-ReportConfig) included within the CSI Measurement Configuration. To this end, the CSI Measurement Configuration can be used to configure an L1 report via MAC CE. And / or the CSI Measurement Configuration may include one or more pieces of information among the LTM CSI Resource Configuration, L1 Measurement Resource Configuration, LTM CSI Resource / Resource Set Configuration Identification Information, and L1 Measurement Resource / Resource Set Configuration Identification Information used for event-triggered measurement reports by the corresponding MAC CE. For reference, the CSI Measurement Configuration of the prior art was an information element used for report configuration, which was channel status information on a PUSCH triggered by a PUCCH or DCI in a serving cell.

[0236] As another example, L1 CSI report configuration information can be defined to be distinct from the LTM CSI report configuration (LTM-CSI-ReportConfig) included within the CSI measurement configuration, and parameters can be defined within that information to direct / configure it. As previously mentioned, the CSI measurement configuration of the prior art was an information element used for report configuration based on channel status information on the PUSCH triggered by PUCCH and DCI in the serving cell. Therefore, in order to distinguish the L1 reporting configuration through MAC CE, it is necessary to define the corresponding L1 measurement configuration information element. The corresponding L1 measurement configuration information element can be composed of an information element included within the serving cell configuration (e.g., ServingCellConfig).

[0237] As another example, you can define an LTM / L1 CSI sub-report configuration within an LTM / L1 CSI report configuration and define the corresponding parameters within that information to direct / configure them.

[0238] As another example, an LTM / L1 CSI report configuration (or LTM / L1 CSI sub-report configuration) may include one or more of the following information as a (directly located) sub-component: information for identifying the L1 report configuration (e.g., LTM-CSI-ReportConfigId), information for identifying the resource configuration for the L1 measurement (e.g., LTM-CSI-ResourceConfigId), the type of the report configuration (e.g., ltm-ReportConfigType), information identifying the LTM / L1 CSI resource used for the event-triggered measurement report by the MAC CE, information identifying the LTM / L1 CSI resource set configuration used for the event-triggered measurement report by the MAC CE, and information indicating whether the event-triggered measurement report is transmitted periodically.

[0239] As another example, the LTM / L1 CSI report configuration (or LTM / L1 CSI sub-report configuration) can be restricted so that the corresponding report configuration type is configured only with event triggers. This allows the terminal to distinguish and operate the corresponding L1 reporting for the LTM.

[0240] As another example, the LTM / L1 CSI report configuration (or LTM / L1 CSI sub-report configuration) can specify a parameter for the number of measurement reports (e.g., reportamount) for event-triggered report types, allowing the terminal to limit the number of corresponding L1 reports. L1 reporting can be initiated / executed when the number of transmitted L1 reports is less than that specified number. A periodic reporting timer can be started when the number of transmitted L1 reports is less than that specified number.

[0241] As another example, a terminal can obtain L1 beam-level measurement results through measurements of one or more beams configured by a base station. The terminal can apply L1 filtering before using the measured results for reporting criteria evaluation and measurement reporting. A MAC entity can perform reporting criteria evaluation based on the L1 filtered measurement results received from the lower layer. For L1 beam-level event-triggered measurement reports, the base station can configure SSB / CSI-RS as the event evaluation RS type and L1-RSRP as the trigger quantity. The LTM report configuration for L1 measurements can be associated with a single resource configuration. That single resource set can be applied to one or more candidate cells / configurations.

[0242] As another example, candidate cell / configuration information (e.g., LTM-Candidate) may include resource configuration (e.g., ltm-NZP-CSI-RS-ResourceConfig) / resource set configuration (e.g., ltm-NZP-CSI-RS-ResourceSet) information for the corresponding L1 measurement. The corresponding L1 measurement resource may be linked to the corresponding candidate cell / configuration.

[0243] As another example, one or more single L1 report configurations may be configured for the corresponding candidate cell / configuration.

[0244] As another example, one or more CSI-RS resources may be linked to the L1 report configuration.

[0245] As another example, one or more CSI-RS resources may be linked to the configuration of the CSI report.

[0246] L1 Reporting Enable / Disable Configuration

[0247] Semi-static CSI-RS or periodic CSI-RS may be supported for L1 measurements (e.g., L1-RSRP / L1-SINR) and / or MAC-CE-based (and / or UCI) L1 reporting for candidate cells / configurations. The base station may enable configured L1 reporting (or configured L1 sub-reporting). Such L1 reporting may be an event-triggered report / report configuration type. And / or such L1 reporting may transmit the L1 report periodically when an LTM event is triggered. Information to indicate this (report interval, report amount) may be included in the L1 report configuration.

[0248] For convenience of explanation, in order to reduce the number of reports in the L1 reporting, the sub / subset / part of the L1 reporting configuration is referred to as L1 sub-reporting below. The L1 sub-report configuration is referred to as L1 sub-report configuration. This is for convenience of explanation and may be replaced with any other name (e.g., CSI report sub-configuration, sub L1 report configuration, sub CSI-RS report configuration, sub LTM report configuration, sub L1 MR configuration, MAC CE-based L1 MR configuration, etc.).

[0249] The base station can enable / disable the configured L1 reporting (or configured L1 sub-reporting) by defining the corresponding MAC CE and transmitting it to the terminal.

[0250] The base station can enable / disable at least one of the configured sub-configuration of a configured L1 reporting by transmitting the corresponding MAC CE.

[0251] The configuration can be configured on the terminal through the corresponding L1 report configuration / subconfiguration information. For each L1 reporting configured with the corresponding L1 report subconfiguration information, the base station may disable all configured subconfigurations by transmitting the corresponding MAC CE. The configured L1 reporting may be initially disabled when the terminal is configured / configured upon receiving an RRC reconfiguration message, and / or after the terminal performs an L3 handover (reconfiguration with sync) upon receiving an RRC reconfiguration message containing reconfiguration with sync (L3 handover command).

[0252] When a terminal (or a terminal's MAC entity) receives a corresponding MAC CE on a serving cell, the terminal (or a terminal's MAC entity) can direct information regarding the corresponding MAC CE to the physical layer.

[0253] The base station can configure / instruct information to instruct the terminal via uplink signaling (e.g., RRC reconfiguration message, MAC CE) to indicate the enable / disable state (or trigger / no-trigger state, or enable / disable state, or resume / suspend state, active / inactive state) for the corresponding L1 measurement and / or L1 reporting.

[0254] For example, through the RRC message, activation / deactivation status information (or trigger / no-trigger status, enable / disable status, resume / suspend status, active / inactive status) for one or more L1 resource configurations of one or more candidate cell(s), one or more L1 resource set configurations of one or more candidate cell(s), and one or more L1 report configurations of one or more candidate cell(s) may be configured on the terminal. The status information may include an associated L1 CSI report configuration indicating the corresponding L1 resource / resource set identification information.

[0255] As another example, the MAC CE may indicate the enable / disable status (or trigger / no trigger status, or enable / disable status, or resume / suspend status, active / inactive status) for one or more L1 resource configurations of one or more candidate cell(s), one or more L1 resource set configurations of one or more candidate cell(s), and one or more L1 report configurations of one or more candidate cell(s).

[0256] As another example, information may be configured in the terminal to configure, apply, or direct the operation of an enable / disable state (or trigger / no-trigger state, enable / disable state, resume / suspend state, active / inactive state) for one or more L1 resource configurations of one or more candidate cell(s), one or more L1 resource set configurations of one or more candidate cell(s), and one or more L1 report configurations of one or more candidate cell(s) through the RRC message. Such information may include an associated L1 CSI report configuration that directs the L1 resource / resource set identification information. For a terminal configured with the information, the activation / deactivation status (or trigger / no-trigger status, or enable / disable status, or resume / suspend status, active / inactive status) for one or more L1 resource configurations of one or more candidate cell(s), one or more L1 resource set configurations of one or more candidate cell(s), and one or more L1 report configurations of one or more candidate cell(s) may be indicated via the MAC CE.

[0257] As another example, for one or more candidate / serving cells, the terminal can be instructed to configure sub-resources / resource sets for the corresponding L1 measurement resources (e.g., SSB / CSI-RS). For instance, if the CSI report configuration for (or associated with) the corresponding L1 reporting has L sub-configurations, the terminal can be instructed to include a list of IDs for N of the L configured sub-configurations within the CSI report configuration for (or associated with) the corresponding L1 reporting.

[0258] The said sub-resource configuration / resource set configuration may include information for identifying the said sub-resource configuration / resource set configuration and one or more of said sub-configuration parameters. The said sub-configuration parameters represent parameters used for the said L1 report sub-configuration. For example, it may include one or more of the following: a port subset indicator indicating a (sub)set of CSI-RS antenna ports used for CSI calculation in the said sub-configuration; codebook configuration information applicable to the ports indicated by said information (e.g., port subset indicator); poweroffset; associated parameters related to the said L1 report sub-configuration; and a list of NZP CSI-RS resources for the said L1 report sub-configuration, which is one set / subset of the NZP CSI-RS resource set for the said L1 report sub-configuration.

[0259] As another example, the relevant L1 measurement configuration (e.g., CSI / SSB / CSI-RS resource configuration / resource set configuration, sub CSI / SSB / CSI-RS resource configuration / resource set configuration) or the relevant L1 report configuration / sub configuration may be included within the execution condition information for conditional LTM of the LTM serving cell. For example, it may be included within the LTM configuration (e.g., LTM-Config) within the execution condition information for conditional LTM of the LTM serving cell.

[0260] As another example, the relevant L1 measurement configuration (e.g., CSI / SSB / CSI-RS resource configuration / resource set configuration, sub-CSI / SSB / CSI-RS resource configuration / resource set configuration) or the relevant L1 report configuration / sub-configuration may be included within the execution condition information for the conditional LTM of an LTM candidate cell. For example, it may be included within the execution condition information for the conditional LTM of an LTM candidate cell / configuration (e.g., LTM-Candidate).

[0261] As another example, L1 measurement configurations (e.g., CSI / SSB / CSI-RS resource configurations / resource set configurations, sub-CSI / SSB / CSI-RS resource configurations / resource set configurations) or the corresponding L1 report configurations / sub-configurations can be linked to execution conditions for conditional LTM in the LTM serving cell.

[0262] As another example, L1 measurement configurations (e.g., CSI / SSB / CSI-RS resource configurations / resource set configurations, sub-CSI / SSB / CSI-RS resource configurations / resource set configurations) or the corresponding L1 report configurations / sub-configurations can be linked to execution conditions for conditional LTMs of LTM candidate cells / configurations.

[0263] As another example, the CSI-RS resource associated with the resource set configuration may be a different CSI-RS resource from the NZP (non-zero-power) CSI-RS resource according to the prior art that is reported via L1 signaling (e.g., UCI, PUCCH, PUSCH). Alternatively, the CSI-RS resource associated with the resource set configuration may be an NZP (non-zero-power) CSI-RS resource for MAC CE-based measurement reporting signaling.

[0264] As another example, the base station can enable / disable the corresponding L1 reporting configured for one or more candidate cell(s). For example, the configured report configuration / subconfiguration can be enabled / disabled by defining the corresponding MAC CE and transmitting it to the terminal. The configuration can be configured on the terminal including resource / resource set subconfiguration information associated with the corresponding L1 reporting.

[0265] As another example, MAC CE can be defined and used in a serving cell to apply, perform, start, initiate, enable, resume, stop, release, disable, suspend, or disable the corresponding L1 report configuration / subconfiguration for the relevant L1 reporting. MAC CE can also be defined and used in a candidate cell / configuration to apply, perform, start, initiate, enable, resume, stop, release, disable, suspend, or disable the corresponding L1 report configuration / subconfiguration for the relevant L1 reporting.

[0266] As another example, the MAC CE includes information to indicate whether the corresponding L1 measurement for the corresponding candidate cell / configuration is enabled, the number of corresponding CSI / SSB / CSI-RS resources / resource sets included in the MAC CE, information to indicate whether the corresponding CSI / SSB / CSI-RS resources / resource sets (and / or sub-CSI / SSB / CSI-RS resources / resource sets) are enabled / disabled, information to indicate whether the sub-configuration included in the corresponding L1 report configuration (or corresponding L1 report sub-configuration) is enabled / disabled, information to indicate whether the CSI / SSB / CSI-RS resources / resource sets (and / or sub-CSI / SSB / CSI-RS resources / resource sets) are enabled / disabled, information to identify the corresponding CSI / SSB / CSI-RS resource configuration, information to identify the corresponding CSI / SSB / CSI-RS resource set configuration, information to identify the corresponding sub-CSI / SSB / CSI-RS resource configuration, and the corresponding sub-CSI / SSB / CSI-RS It may include one or more of the following information: information for identifying a resource set configuration, the corresponding CSI-RS index (or CRI: CSI-RS resource indicator), identification information for candidate cells / configurations of the corresponding CSI / SSB / CSI-RS resource / resource set configuration, identification information for associated CSI / SSB / CSI-RS reports, corresponding event LTM information, corresponding threshold, the corresponding serving / candidate cell ID to which the corresponding MAC CE applies, the corresponding candidate configuration ID to which the corresponding MAC CE applies, a list of corresponding candidate cell / configuration IDs to which the corresponding MAC CE applies, and the corresponding BWP-ID to which the corresponding MAC CE applies.

[0267] L1 Reporting Enable / Disable MAC CE

[0268] The base station can enable / disable the corresponding L1 reporting configured for one or more candidate cell(s). For example, the corresponding L1 reporting can be enabled / disabled by defining the corresponding MAC CE and transmitting it to the terminal.

[0269] The base station can enable / disable at least one of the configured sub-configuration of a configured L1 reporting by transmitting the corresponding MAC CE.

[0270] The configuration can be configured on the terminal through the corresponding L1 report configuration / subconfiguration information. For each L1 reporting configured with the corresponding L1 report subconfiguration information, the base station may disable all configured subconfigurations by transmitting the corresponding MAC CE. The configured L1 reporting may be initially disabled when the terminal is configured / configured upon receiving an RRC reconfiguration message, and / or after the terminal performs an L3 handover (reconfiguration with sync) upon receiving an RRC reconfiguration message containing reconfiguration with sync (L3 handover command).

[0271] When a terminal (or a terminal's MAC entity) receives a corresponding MAC CE on a serving cell, the terminal (or a terminal's MAC entity) can direct information regarding the corresponding MAC CE to the physical layer.

[0272] For example, the MAC CE may include one or more of the following: information for identifying the candidate / serving cell to which the MAC CE applies (e.g., a 5-bit serving cell ID / ServCellIndex, physical cell ID); information for identifying the candidate configuration to which the MAC CE applies (e.g., ltm-CandidateId, Target Configuration ID: ltm-CandidateId - 1); a 2-bit UL BWP-ID / DL BWP-ID to which the MAC CE applies (depending on the code point of the DCI bandwidth part indicator field); and information for indicating the enabled / disabled status of the L1 report within the list of L1 report configurations / subconfigurations (e.g., ltm-CSI-ReportConfig, ltm-CSI-subReportConfig) to which the MAC CE applies. The information field for indicating the enabled / disabled status of the L1 report within the list of L1 report configurations / subconfigurations to which the MAC CE applies may have a number of bits less than or equal to 48, taking into account the maximum number of CSI report configurations (e.g., 48). The information field may have a number of bits greater than or equal to 8, taking into account the maximum number of subconfigurations per CSI report configuration (e.g., 8). The i-th bit of the information field may be determined according to the ascending (or descending) order of the corresponding L1 report configuration identifier. For example, the first bit (e.g., i=0) may be for the report configuration with the lowest corresponding L1 report configuration identifier. The second bit (i=1) may be for the report configuration with the second lowest corresponding L1 report configuration identifier. If a bit of the field is set to 0, the configuration may be disabled. If a bit of the field is set to 1, the configuration may be enabled.

[0273] As another example, information specifying the size (e.g., number of bits) of an information field indicating the enable / disable status of a corresponding L1 report within the L1 report configuration / subconfiguration list to which the MAC CE applies can be explicitly or implicitly configured or instructed to the terminal by the base station. For instance, such instruction information can be defined and transmitted. Alternatively, the terminal can be configured to process this information by taking it into account based on the L1 report configuration / subconfiguration list included in the RRC message. This allows the terminal to easily process the information by considering the size applied in the L1 report configuration.

[0274] As another example, the size (e.g., number of bits) of an information field indicating the enabled / disabled status of a corresponding L1 report within the L1 report configuration / subconfiguration list to which the MAC CE applies can have a fixed value. If the number of corresponding L1 report configurations / subconfigurations (having the corresponding report configuration type (e.g., event-triggered)) within the L1 report configuration / subconfiguration list included in the RRC message is less than the fixed value (e.g., i + 1), the terminal can be configured to ignore the i-th bit / field. This prevents the terminal from performing unnecessary actions.

[0275] As another example, the L1 report configuration / subconfiguration to which the MAC CE applies can be configured to have an event-triggered report type (e.g., report configuration type).

[0276] As another example, the MAC CE may include one or more of the following information: information for identifying the candidate / serving cell to which the MAC CE applies (e.g., a 5-bit serving cell ID / ServCellIndex, physical cell ID); information for identifying the candidate configuration to which the MAC CE applies (e.g., ltm-CandidateId, Target Configuration ID: ltm-CandidateId - 1); a 2-bit UL BWP-ID / DL BWP-ID to which the MAC CE applies (depending on the code point of the DCI bandwidth part indicator field); information for indicating the enabled / disabled status of the corresponding L1 report within the list of the corresponding L1 report configuration (e.g., ltm-CSI-ReportConfig) to which the MAC CE applies; and information for indicating the enabled / disabled status of the subconfiguration x within the list of the corresponding L1 report subconfiguration (e.g., ltm-CSI-subReportConfig) for the corresponding L1 report configuration identifier i.

[0277] As another example, the size (e.g., number of bits) of the information field for indicating the enabled / disabled status of the corresponding L1 report within the list of corresponding L1 report configurations (e.g., ltm-CSI-ReportConfig) to which the corresponding MAC CE applies may be set to a fixed value (e.g., 4 or 8). The size (e.g., number of bits) of the field for indicating the enabled / disabled status of subconfiguration x within the list of corresponding L1 report subconfigurations (e.g., ltm-CSI-subReportConfig) for the corresponding L1 report configuration identifier i may be set to a fixed value (e.g., 4 or 8).

[0278] As another example, at least one of the size (e.g., number of bits) of an information field indicating the enabled / disabled status of the corresponding L1 report within the list of L1 report configurations (e.g., ltm-CSI-ReportConfig) to which the corresponding MAC CE applies, or the size (e.g., number of bits) of a field indicating the enabled / disabled status of subconfiguration x within the list of L1 report subconfigurations (e.g., ltm-CSI-subReportConfig) for the corresponding L1 report configuration identifier i, may be explicitly or implicitly configured / instructed to the terminal by the base station. For example, the instruction information may be defined and transmitted. Alternatively, the terminal may be made to process it by taking it into account based on the list of L1 report configurations / subconfigurations included in the corresponding RRC message. This allows the terminal to easily process it by taking into account the size applied in the corresponding L1 report configuration.

[0279] As another example, if the size (e.g., number of bits) of the information field for indicating the enabled / disabled status of the corresponding L1 report within the list of L1 report configurations (e.g., ltm-CSI-ReportConfig) to which the corresponding MAC CE applies has a fixed value (e.g., 4), and the size (e.g., number of bits) of the field for indicating the enabled / disabled status of subconfiguration x within the list of L1 report subconfigurations (e.g., ltm-CSI-subReportConfig) for the corresponding L1 report configuration identifier i has a fixed value (e.g., 8), then if the bit / field for indicating the enabled / disabled status of the corresponding L1 report within the i-th L1 report configuration list is set to enabled (e.g., 1), then for the corresponding i,x bit / field, for example, x=0, 1, 2, 3, 4, 5, 6, 7, the i,x bit / field may exist. If a bit / field indicating the enabled / disabled status of the corresponding L1 report within the i-th L1 report configuration list is set to disabled (e.g., 0), then for the corresponding i,x bit / field, for example, an i,x bit / field where x=0, 1, 2, 3, 4, 5, 6, 7, can be made not to exist. For a disabled L1 report configuration, all sub-configurations are also disabled, so the corresponding bit / field can be made not to exist.

[0280] As another example, if the number of corresponding L1 report subconfigurations (having the corresponding report configuration type, e.g., event-triggered) within the list of L1 report subconfigurations included in the RRC message is less than a fixed value (e.g., x + 1), the terminal can be made to ignore the i-th and x-th bits / fields. This prevents the terminal from performing unnecessary actions.

[0281] As another example, the i-th and j-th bits of the information field for indicating the enabled / disabled status of a sub-configuration included in the corresponding L1 report configuration may be determined based on the ascending (or descending) order of information identifying the i-th configured L1 report configuration and the ascending (or descending) order of information identifying the j-th configured L1 report sub-configuration for i / j. If the bit of the field is set to 0, the configuration may be disabled. If the bit of the field is set to 1, the configuration may be enabled.

[0282] As another example, the MAC CE may include one or more pieces of information, such as information indicating whether the L1 report configuration / subconfiguration for the candidate / serving cell / configuration is enabled / disabled (e.g., a 1-bit A / D field), or information indicating whether the L1 report within the list of L1 report configurations / subconfigurations to which the MAC CE applies is enabled / disabled.

[0283] As another example, regarding information for indicating the enabled / disabled status of the corresponding L1 report configuration / subconfiguration for the corresponding candidate / serving cell / configuration, the i-th bit of the corresponding field may be determined according to the ascending (or descending) order of the configured candidate cell / configuration identifiers. For example, the first bit (e.g., i=0) may be for the candidate cell / configuration having the lowest corresponding candidate cell / configuration identifier. The second bit (i=1) may be for the candidate cell / configuration having the second lowest corresponding candidate cell / configuration identifier. (Alternatively, the first bit (e.g., i=0) may be for the cell / configuration of the serving cell. The second bit (i=1) may be for the candidate cell / configuration having the lowest corresponding candidate cell / configuration identifier, excluding the serving cell.)

[0284] As another example, if information for indicating whether the L1 report configuration / subconfiguration for the corresponding candidate / serving cell / configuration is enabled / disabled has a fixed value (e.g., 4), and the size (e.g., number of bits) of the field for indicating whether configuration x in the L1 report configuration list for the corresponding candidate / serving cell / configuration identifier i is enabled / disabled has a fixed value (e.g., 8), then if the bit / field for indicating the enabled / disabled status of the corresponding L1 report within the i-th candidate / serving cell / configuration is set to enabled (e.g., 1), then for the corresponding i,x bit / field, for example, x=0, 1, 2, 3, 4, 5, 6, 7, the i,x bit / field may exist. If a bit / field indicating the enabled / disabled status of the corresponding L1 report within the i-th corresponding candidate / serving cell / configuration is set to disabled (e.g., 0), then for the corresponding i,x bit / field, for example, x=0, 1, 2, 3, 4, 5, 6, 7, the i,x bit / field may not exist. For disabled candidate cells / configurations, the corresponding L1 report configuration may also be disabled, so the bit / field may not exist.

[0285] As another example, if the number of corresponding L1 measurement subconfigurations within the list of candidate cells / configurations included in the RRC message is less than the corresponding fixed value (e.g., x + 1), the terminal can be instructed to ignore the i-th and x-th bits / fields. This prevents the terminal from performing unnecessary operations.

[0286] As another example, information indicating the enabled or disabled status of the corresponding L1 report configuration / subconfiguration for the candidate / serving cell / configuration to which the MAC CE applies may have a fixed value. If the number of corresponding candidate cells / configurations within the list of candidate cells / configurations included in the RRC message is less than the fixed value (e.g., i + 1), the terminal may be instructed to ignore the i-th bit / field. This prevents the terminal from performing unnecessary actions.

[0287] As another example, the MAC CE may be provided through one or more MAC CEs having different LCIDs / eLCIDs. For example, one can define and use a MAC CE with 8 bits of information indicating whether the corresponding L1 report configuration for the corresponding candidate cell / configuration is enabled, and a MAC CE with 16 / 32 bits of information indicating whether the corresponding L1 report configuration for the corresponding candidate cell / configuration is enabled. Alternatively, one can define and use a MAC CE with a specific number of bits of information indicating whether the corresponding L1 report configuration for the corresponding candidate cell / configuration is enabled, and a MAC CE with another specific number of bits of information indicating whether the corresponding L1 report configuration for the corresponding candidate cell / configuration is enabled. Alternatively, one can define and use a MAC CE with a specific number of bits and a MAC CE with another specific number of bits. Alternatively, it may include a MAC CE for indicating whether the corresponding L1 report configuration for a candidate cell / configuration is enabled, and a MAC CE for indicating whether the corresponding CSI / SSB / CSI-RS resource / resource set (and / or sub-CSI / SSB / CSI-RS resource / resource set) is enabled / disabled. Alternatively, it may include a MAC CE for indicating whether the corresponding L1 report configuration for a candidate cell / configuration is enabled, and a MAC CE for indicating whether the corresponding L1 report subconfiguration included in / associated with the corresponding L1 report configuration for the candidate cell / configuration is enabled. Alternatively, it may include a MAC CE for indicating whether the corresponding L1 report configuration for a single candidate cell / configuration is enabled, and a MAC CE for indicating whether the corresponding L1 report configuration for one or more candidate cells / configurations is enabled.

[0288] As another example, the MAC CE can be made to have a variable size. This allows it to direct the activation or deactivation of one or more resources / resource sets.

[0289] As another example, the MAC CE can be made to have a fixed size. This allows for a reduction in processing overhead at the terminal and base station.

[0290] As explained above, the present disclosure can effectively reduce L1 measurements and reporting required to support LTM procedures.

[0291] Below, the configuration of a terminal and a base station capable of performing the aforementioned embodiment is briefly described once again. Even if not described below, the aforementioned embodiment may be performed by a terminal and a base station.

[0292] FIG. 10 is a drawing for explaining a terminal configuration according to one embodiment.

[0293] Referring to FIG. 10, a terminal (1000) controlling a mobility operation may include a receiver (1030) that receives an RRC message from a base station containing initial state instruction information indicating an initial state of an L1 measurement operation or an L1 measurement reporting operation in an LTM procedure, and a control unit (1010) that determines whether to apply or configure an L1 measurement operation or an L1 measurement reporting operation according to the RRC message based on the initial state instruction information. The receiver (1030) further receives a MAC CE indicating whether to activate an L1 measurement operation or an L1 measurement reporting operation, and the control unit (1010) may activate or deactivate an L1 measurement operation or an L1 measurement reporting operation based on the MAC CE.

[0294] For example, the receiver (1030) can receive configuration information for LTM procedure operation through an RRC message transmitted by the base station. For example, the configuration information may be LTM configuration information. The LTM configuration information may include at least one of LTM candidate configuration, LTM CSI resource configuration, and LTM CSI report configuration. Additionally, the RRC message may be an RRC connection reconfiguration message.

[0295] LTM configuration information may include candidate cell information for the terminal to execute an LTM procedure, measurement information for L1 measurement, and reporting information for reporting L1 measurement results. LTM candidate configuration may include at least one of candidate cell information, measurement information, and reporting information. LTM CSI resource configuration may include CSI-RS resource set information that the terminal monitors and measures for L1 measurement. LTM CSI reporting configuration may include a reporting period, reporting resources, information included in the report, etc., for reporting L1 measurement results measured by the terminal.

[0296] The aforementioned LTM configuration information may include LTM candidate configurations, LTM CSI resource configurations, and LTM CSI reporting configurations, and the LTM candidate configurations, LTM CSI resource configurations, and LTM CSI reporting configurations may each be interconnected or configured in an inclusion relationship through any combination.

[0297] Meanwhile, the RRC message may include initial state indication information to indicate the initial state of the terminal's L1 measurement operation or L1 measurement reporting operation.

[0298] For example, the initial state instruction information may include information indicating whether to initially enable an L1 measurement action or an L1 measurement reporting action for a set of CSI-RS resources associated with one or more of an LTM candidate configuration, an LTM CSI resource configuration, and an LTM CSI reporting configuration. As an example, the initial state instruction information may include information indicating whether to enable or disable an L1 measurement action or an L1 measurement reporting action for each set of CSI-RS resources for L1 measurement. As another example, the initial state instruction information may include information indicating whether to enable or disable an action for each LTM candidate configuration. As yet another example, the initial state instruction information may include information indicating whether to enable or disable an action for each LTM CSI resource configuration. As yet another example, the initial state instruction information may include information indicating whether to enable or disable an action for each LTM CSI reporting configuration.

[0299] One or more CSI-RS resource sets may be configured to be linked to at least one of an LTM candidate configuration, an LTM CSI resource configuration, and an LTM CSI reporting configuration. Here, being configured to be linked may mean that CSI-RS resource set information is included in the LTM candidate configuration, included in the LTM CSI resource configuration, or included in the LTM CSI reporting configuration.

[0300] Accordingly, the initial state indication information may explicitly or implicitly indicate the initial activation status of one or more CSI-RS resource sets associated with each by indicating whether to activate the LTM candidate configuration, LTM CSI resource configuration, and LTM CSI reporting configuration, respectively.

[0301] For example, the control unit (1010) can store and configure information for the operation of an LTM procedure of an RRC message received from a base station. Based on the aforementioned initial state instruction information, the control unit (1010) can apply or configure the L1 measurement operation or L1 measurement reporting operation in the LTM procedure to an enabled or disabled state. For example, the control unit (1010) can store the information received via the RRC message in the terminal, but regarding the execution of the L1 measurement operation based on each piece of information, it can be applied only to the CSI-RS resource set activated according to the initial state instruction information. Alternatively, the control unit (1010) can store the information received via the RRC message in the terminal, but regarding the execution of the L1 measurement reporting operation based on each piece of information, it can be applied only to the measurement reporting of the CSI-RS resource set activated according to the initial state instruction information.

[0302] An RRC message may include an LTM configuration for performing an L1 measurement operation or an L1 measurement reporting operation for one or more candidate cells. Accordingly, an RRC message may include information for measurement or measurement reporting for multiple candidate cells. In this case, it may be an unnecessary waste of resources for the terminal to continuously perform an L1 measurement or L1 measurement reporting operation for all candidate cells. Therefore, in the present disclosure, only the L1 measurement operation or L1 measurement reporting operation indicated as an active state by the initial state indication information may be performed initially.

[0303] As described above, the initial state instruction information may indicate whether to enable any one of the LTM candidate configurations, LTM CSI resource configurations, LTM CSI reporting configurations, and CSI-RS resource sets. Accordingly, in the case of a configuration indicated as enabled, the terminal applies or configures it in the enabled state to perform operations. If there is a configuration indicated as disabled, the terminal may apply or configure operations related to that configuration in the disabled state.

[0304] At least one of the LTM candidate configuration, LTM CSI resource configuration, and LTM CSI reporting configuration is configured in conjunction with a CSI-RS resource set; when activation is indicated at the configuration level, the terminal applies or configures L1 measurement operations or L1 measurement reporting operations for all CSI-RS resource sets associated with the configuration in a collectively enabled or disabled state.

[0305] Additionally, the receiver (1030) can receive MAC CE from the base station after receiving an RRC message for the LTM procedure.

[0306] For example, MAC CE may include instruction information indicating whether to enable an L1 measurement operation or an L1 measurement reporting operation for a CSI-RS resource set associated with one or more of an LTM candidate configuration, an LTM CSI resource configuration, and an LTM CSI reporting configuration. Similar to initial state instruction information, the instruction information may also be configured to indicate whether to enable any one of the LTM candidate configuration, an LTM CSI resource configuration, an LTM CSI reporting configuration, and a CSI-RS resource set. However, since a CSI-RS resource set is associated with at least one of the LTM candidate configuration, an LTM CSI resource configuration, and an LTM CSI reporting configuration, the L1 measurement operation or an L1 measurement reporting operation associated with the CSI-RS resource set may be indicated whether to enable it explicitly or implicitly.

[0307] For example, the instruction information may include information indicating whether to enable per LTM candidate configuration, per LTM CSI resource configuration, or per LTM CSI reporting configuration. One or more CSI-RS resource sets are linked and configured for each LTM candidate configuration, each LTM CSI resource configuration, or each LTM CSI reporting configuration. Accordingly, for one or more CSI-RS resource sets, L1 measurement operations or L1 measurement reporting operations may be enabled or disabled depending on whether to enable according to the instruction information for each LTM candidate configuration, each LTM CSI resource configuration, or each LTM CSI reporting configuration.

[0308] The instructions based on MAC CE and the initial state instructions based on RRC messages can indicate whether to enable or disable the same level (LTM candidate configuration, LTM CSI resource configuration, LTM CSI reporting configuration, or CSI-RS resource set). Alternatively, the instructions based on MAC CE and the initial state instructions based on RRC messages can indicate whether to enable or disable the same level.

[0309] Meanwhile, MAC CE may be configured to be associated with periodic or event-triggered L1 measurement reporting operations. For example, an activation instruction via MAC CE may be applied only to periodic L1 measurement reporting operations. Alternatively, an activation instruction via MAC CE may be applied only to event-triggered L1 measurement reporting operations. In addition, an activation instruction based on the MAC CE's instruction information may be applied only under specific configuration conditions.

[0310] MAC CE may include at least one of LTM candidate configuration identification information, LTM CSI resource configuration identification information, LTM CSI reporting configuration identification information, cell identification information, CSI-RS resource set identification information, and instruction information indicating whether to enable L1 measurement operation or L1 measurement reporting operation.

[0311] For example, LTM candidate configuration identification information, LTM CSI resource configuration identification information, LTM CSI report configuration identification information, cell identification information, and CSI-RS resource set identification information can each be associated with corresponding identification information included in an RRC message. Through this, the terminal can determine which configuration or information configured in the terminal is indicated by the identification information of the MAC CE. Additionally, indication information can be set in correspondence with or associated with the identification information. The indication information can be composed of a 1-bit A / D field. That is, the indication information indicates whether the corresponding identification information is in an active or inactive state.

[0312] As described above, depending on the level at which activation is indicated, at least one of LTM candidate configuration identification information, LTM CSI resource configuration identification information, LTM CSI report configuration identification information, cell identification information, and CSI-RS resource set identification information may be included in MAC CE.

[0313] The control unit (1010) changes the state of a configuration or resource set corresponding to the identification information indicated by the MAC CE to enabled or disabled. Since the state of the configuration or resource set is configured in the terminal according to the initial state instruction information, only the state of the configuration or resource set indicated by the MAC CE needs to be changed. Because the base station does not need to include identification information and instruction information in the MAC CE for configurations or resource sets that do not require change, it can prevent unnecessary resource waste of the MAC CE.

[0314] For example, the control unit (1010) checks the identification information configured by the RRC message according to the identification information indicated by the MAC CE, and can change the state of the configuration or resource set indicated by the identification information to enabled or disabled. When the state is changed to enabled, the corresponding L1 measurement operation or L1 measurement reporting operation can be performed by the terminal.

[0315] Meanwhile, the MAC CE for indicating whether to activate the L1 measurement operation and the MAC CE for indicating whether to activate the L1 measurement reporting operation may be configured as different MAC CEs. Alternatively, in a single MAC CE, the L1 measurement reporting operation and the L1 measurement operation may be indicated simultaneously or separately depending on the identification target included in the identification information.

[0316] In addition, the control unit (1010) controls the overall operation of the terminal (1000) according to the mobility control operation of the terminal necessary to perform the above-described embodiments.

[0317] The transmitting unit (1020) and the receiving unit (1030) are used to transmit and receive signals, messages, and data necessary to perform the aforementioned disclosure with a base station.

[0318] Through the aforementioned operation, when an LTM procedure for one or more candidate cells is configured in the terminal, frequent L1 measurement or measurement reporting operations of the terminal can be prevented. In addition, system overload can be reduced by minimizing MAC CE resources while the base station dynamically controls the terminal's L1 measurement or measurement reporting operations.

[0319] FIG. 11 is a drawing for explaining the configuration of a base station according to one embodiment.

[0320] Referring to FIG. 11, a base station (1100) that controls the mobility operation of a terminal may include a transmitter (1120) that transmits an RRC message to the terminal containing initial state instruction information indicating the initial state of the terminal's L1 measurement operation or L1 measurement reporting operation in an LTM procedure, and transmits a MAC CE to the terminal indicating whether the L1 measurement operation or the L1 measurement reporting operation is activated, and a receiver (1130) that receives the measurement result of the activated L1 measurement operation from the terminal based on the MAC CE.

[0321] The transmitting unit (1120) can transmit configuration information for LTM procedure operation to the terminal via an RRC message. For example, the configuration information may be LTM configuration information. The LTM configuration information may include at least one of LTM candidate configuration, LTM CSI resource configuration, and LTM CSI report configuration. Additionally, the RRC message may be an RRC connection reconfiguration message.

[0322] LTM configuration information may include candidate cell information for the terminal to execute an LTM procedure, measurement information for L1 measurement, and reporting information for reporting L1 measurement results. LTM candidate configuration may include at least one of candidate cell information, measurement information, and reporting information. LTM CSI resource configuration may include CSI-RS resource set information that the terminal monitors and measures for L1 measurement. LTM CSI reporting configuration may include a reporting period, reporting resources, information included in the report, etc., for reporting L1 measurement results measured by the terminal.

[0323] The aforementioned LTM configuration information may include LTM candidate configurations, LTM CSI resource configurations, and LTM CSI reporting configurations, and the LTM candidate configurations, LTM CSI resource configurations, and LTM CSI reporting configurations may each be interconnected or configured in an inclusion relationship through any combination.

[0324] The RRC message may include initial state indication information to indicate the initial state of the terminal's L1 measurement operation or L1 measurement reporting operation.

[0325] For example, the initial state instruction information may include information indicating whether to initially enable an L1 measurement action or an L1 measurement reporting action for a set of CSI-RS resources associated with one or more of an LTM candidate configuration, an LTM CSI resource configuration, and an LTM CSI reporting configuration. As an example, the initial state instruction information may include information indicating whether to enable or disable an L1 measurement action or an L1 measurement reporting action for each set of CSI-RS resources for L1 measurement. As another example, the initial state instruction information may include information indicating whether to enable or disable an action for each LTM candidate configuration. As yet another example, the initial state instruction information may include information indicating whether to enable or disable an action for each LTM CSI resource configuration. As yet another example, the initial state instruction information may include information indicating whether to enable or disable an action for each LTM CSI reporting configuration.

[0326] One or more CSI-RS resource sets may be configured to be linked to at least one of an LTM candidate configuration, an LTM CSI resource configuration, and an LTM CSI reporting configuration. Here, being configured to be linked may mean that CSI-RS resource set information is included in the LTM candidate configuration, the LTM CSI resource configuration, or the LTM CSI reporting configuration. Additionally, being configured to be linked may include cases where the CSI-RS resource set and the LTM CSI reporting configuration are included in the LTM CSI resource configuration and configured at the same level. Alternatively, it may include cases where they are linked through specific identification information, etc.

[0327] Accordingly, the initial state indication information may explicitly or implicitly indicate the initial activation status of one or more CSI-RS resource sets associated with each by indicating whether to activate the LTM candidate configuration, LTM CSI resource configuration, and LTM CSI reporting configuration, respectively.

[0328] The terminal can store and configure information for the operation of the LTM procedure of the RRC message received from the base station. Based on the aforementioned initial state instruction information, the terminal can apply or configure the L1 measurement operation or L1 measurement reporting operation in the LTM procedure to an enabled or disabled state. For example, the terminal may store the information received via the RRC message, but regarding the execution of the L1 measurement operation based on each piece of information, it may apply it only to the CSI-RS resource set enabled according to the initial state instruction information. Alternatively, the terminal may store the information received via the RRC message, but regarding the execution of the L1 measurement reporting operation based on each piece of information, it may apply it only to the measurement reporting of the CSI-RS resource set enabled according to the initial state instruction information.

[0329] For example, the transmitter (1120) may transmit a MAC CE to dynamically indicate whether an LTM procedure configured in the terminal is active. Although the initial state of an L1 measurement operation or an L1 measurement reporting operation is configured to be active or inactive according to the initial state instruction information of the terminal, the base station (1100) needs to instruct a change to the active state. To do this, the base station (1100) may transmit a MAC CE to the terminal to dynamically change the active or inactive state.

[0330] For example, MAC CE may include instruction information indicating whether to enable an L1 measurement operation or an L1 measurement reporting operation for a CSI-RS resource set associated with one or more of an LTM candidate configuration, an LTM CSI resource configuration, and an LTM CSI reporting configuration. Similar to initial state instruction information, the instruction information may also be configured to indicate whether to enable any one of the LTM candidate configuration, an LTM CSI resource configuration, an LTM CSI reporting configuration, and a CSI-RS resource set. However, since a CSI-RS resource set is associated with at least one of the LTM candidate configuration, an LTM CSI resource configuration, and an LTM CSI reporting configuration, the L1 measurement operation or an L1 measurement reporting operation associated with the CSI-RS resource set may be indicated whether to enable it explicitly or implicitly.

[0331] For example, the instruction information may include information indicating whether to enable per LTM candidate configuration, per LTM CSI resource configuration, or per LTM CSI reporting configuration. One or more CSI-RS resource sets are linked and configured for each LTM candidate configuration, each LTM CSI resource configuration, or each LTM CSI reporting configuration. Accordingly, for one or more CSI-RS resource sets, L1 measurement operations or L1 measurement reporting operations may be enabled or disabled depending on whether to enable according to the instruction information for each LTM candidate configuration, each LTM CSI resource configuration, or each LTM CSI reporting configuration.

[0332] The instructions based on MAC CE and the initial state instructions based on RRC messages can indicate whether to enable or disable the same level (LTM candidate configuration, LTM CSI resource configuration, LTM CSI reporting configuration, or CSI-RS resource set). Alternatively, the instructions based on MAC CE and the initial state instructions based on RRC messages can indicate whether to enable or disable the same level.

[0333] Meanwhile, MAC CE may be configured to be associated with periodic or event-triggered L1 measurement reporting operations. For example, an activation instruction via MAC CE may be applied only to periodic L1 measurement reporting operations. Alternatively, an activation instruction via MAC CE may be applied only to event-triggered L1 measurement reporting operations. In addition, an activation instruction based on the MAC CE's instruction information may be applied only under specific configuration conditions.

[0334] MAC CE may include at least one of LTM candidate configuration identification information, LTM CSI resource configuration identification information, LTM CSI reporting configuration identification information, cell identification information, CSI-RS resource set identification information, and instruction information indicating whether to enable L1 measurement operation or L1 measurement reporting operation.

[0335] For example, LTM candidate configuration identification information, LTM CSI resource configuration identification information, LTM CSI report configuration identification information, cell identification information, and CSI-RS resource set identification information can each be associated with corresponding identification information included in an RRC message. Through this, the terminal can determine which configuration or information configured in the terminal is indicated by the identification information of the MAC CE. Additionally, indication information can be set in correspondence with or associated with the identification information. The indication information can be composed of a 1-bit A / D field. That is, the indication information indicates whether the corresponding identification information is in an active or inactive state.

[0336] As described above, depending on the level at which activation is indicated, at least one of LTM candidate configuration identification information, LTM CSI resource configuration identification information, LTM CSI report configuration identification information, cell identification information, and CSI-RS resource set identification information may be included in MAC CE.

[0337] The terminal changes the state of the configuration or resource set corresponding to the identification information indicated by the MAC CE to enabled or disabled. Since the state of the configuration or resource set is configured in the terminal according to the initial state instruction information, it is sufficient to change only the state of the configuration or resource set indicated by the MAC CE. Because the base station does not need to include identification and instruction information in the MAC CE for configurations or resource sets that do not require change, it can also prevent unnecessary resource waste by the MAC CE.

[0338] For example, the terminal checks the identification information configured by the RRC message according to the identification information indicated by the MAC CE, and can change the state of the configuration or resource set indicated by the identification information to enabled or disabled. If the state is changed to enabled, the corresponding L1 measurement operation or L1 measurement reporting operation may be performed by the terminal.

[0339] The receiver (1130) can receive the L1 measurement results of the activated candidate cell / LTM configuration / LTM CSI resource / CSI-RS resource set through the L1 measurement that is active in the terminal and the L1 measurement report based thereon.

[0340] In addition, the control unit (1110) controls the overall operation of the base station (1100) according to the mobility control operation of the terminal required to perform the above-described embodiments.

[0341] The transmitting unit (1120) and the receiving unit (1130) are used to transmit and receive signals, messages, and data necessary to perform the aforementioned invention with the terminal.

[0342] The aforementioned 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, configurations, and parts in the embodiments that are not described to clearly reveal the technical concept may be supported by the aforementioned standard documents. Furthermore, all terms disclosed in this specification may be explained by the standard documents disclosed above.

[0343] The embodiments described above may be implemented through various means. For example, the embodiments may be implemented by hardware, firmware, software, or a combination thereof.

[0344] In the case of implementation by hardware, the method according to the 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.

[0345] In the case of implementation by firmware or software, the method according to the embodiments may be implemented in the form of a device, procedure, or function that performs the functions or operations described above. Software code may be stored in a memory unit and executed by a processor. The memory unit may be located inside or outside the processor and may exchange data with the processor by various means already known.

[0346] Additionally, terms such as "system," "processor," "controller," "component," "module," "interface," "model," or "unit" described above may generally refer to computer-related entities, hardware, combinations of hardware and software, software, or running software. For example, the aforementioned components may be, but are not limited to, processes driven by a processor, processors, controllers, control processors, objects, execution threads, programs, and / or computers. For example, both the application running on the controller or processor and the controller or processor may be components. One or more components may reside within a process and / or execution thread, 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.

[0347] The foregoing description is merely an illustrative explanation of the technical concept of the present disclosure, and those skilled in the art to which the present disclosure pertains may make various modifications and variations within the scope of the essential characteristics of the technical concept. Furthermore, since these embodiments are intended to explain, not limit, the scope of the technical concept is not limited by these embodiments. The scope of protection of the present disclosure shall be interpreted by the claims below, and all technical concepts within an equivalent scope shall be interpreted as being included within the scope of rights of the present disclosure.

[0348]

[0349] CROSS-REFERENCE TO RELATED APPLICATION

[0350] This patent application claims priority pursuant to Section 119(a) of the U.S. Patent Act (35 USC § 119(a)) to Korean Patent Application No. 10-2025-0037488 and Korean Patent Application No. 10-2025-0037413 filed in Korea on March 24, 2025, all of which are incorporated by reference into this patent application. Furthermore, this patent application claims priority in countries other than the United States for the same reasons as above, all of which are incorporated by reference into this patent application.

Claims

1. In a method for controlling the mobility of a terminal, A step of receiving an RRC message from a base station containing initial state indication information that indicates the initial state of an L1 measurement operation or an L1 measurement reporting operation in an LTM procedure; A step of determining whether to apply or configure the L1 measurement operation or L1 measurement reporting operation according to the RRC message based on the initial state instruction information; A step of receiving a MAC CE indicating whether the above L1 measurement operation is activated or whether the above L1 measurement reporting operation is activated; and A method comprising the step of enabling or disabling the L1 measurement operation or L1 measurement reporting operation based on the above MAC CE.

2. In Paragraph 1, The above initial state indication information is, A method comprising information indicating whether to initially enable the L1 measurement operation or the L1 measurement reporting operation for a CSI-RS resource set associated with one or more of an LTM candidate configuration, an LTM CSI resource configuration, and an LTM CSI reporting configuration.

3. In Paragraph 1, The above MAC CE is, A method comprising instruction information indicating whether to enable the L1 measurement operation or L1 measurement reporting operation for a CSI-RS resource set associated with one or more of an LTM candidate configuration, an LTM CSI resource configuration, and an LTM CSI reporting configuration.

4. In Paragraph 3, The above instruction information is, A method for indicating whether to enable the above LTM candidate configuration, the above LTM CSI resource configuration, or the above LTM CSI reporting configuration.

5. In Paragraph 4, For each LTM candidate configuration, each LTM CSI resource configuration, or each LTM CSI reporting configuration, one or more of the above CSI-RS resource sets are linked and configured, A method in which the L1 measurement operation or L1 measurement reporting operation is enabled or disabled according to the activation status indicated by the instruction information for each of the above one or more CSI-RS resource sets, each LTM candidate configuration, each LTM CSI resource configuration, or each LTM CSI reporting configuration.

6. In Paragraph 1, The above MAC CE is, A method configured to be linked to the above L1 measurement reporting operation based on periodic or event triggers.

7. In Paragraph 1, The above MAC CE is, A method comprising at least one of LTM candidate configuration identification information, LTM CSI resource configuration identification information, LTM CSI reporting configuration identification information, cell identification information, CSI-RS resource set identification information, and instruction information indicating whether the L1 measurement operation or L1 measurement reporting operation is enabled.

8. A method for a base station to control the mobility operation of a terminal, A step of transmitting an RRC message to the terminal that includes initial state indication information indicating the initial state of the terminal's L1 measurement operation or L1 measurement reporting operation in the LTM procedure; A step of transmitting a MAC CE to the terminal indicating whether the above L1 measurement operation is activated or whether the above L1 measurement reporting operation is activated; and A method comprising the step of receiving the measurement result of the L1 measurement operation activated based on the MAC CE from the terminal.

9. In Paragraph 8, The above initial state indication information is, A method comprising information indicating whether to initially enable the L1 measurement operation or the L1 measurement reporting operation for a CSI-RS resource set associated with one or more of an LTM candidate configuration, an LTM CSI resource configuration, and an LTM CSI reporting configuration.

10. In Paragraph 8, The above MAC CE is, A method comprising instruction information indicating whether to enable the L1 measurement operation or L1 measurement reporting operation for a CSI-RS resource set associated with one or more of an LTM candidate configuration, an LTM CSI resource configuration, and an LTM CSI reporting configuration.

11. In Paragraph 10, The above instruction information is, A method for indicating whether to enable the above LTM candidate configuration, the above LTM CSI resource configuration, or the above LTM CSI reporting configuration.

12. In Paragraph 8, The above MAC CE is, A method comprising at least one of LTM candidate configuration identification information, LTM CSI resource configuration identification information, LTM CSI reporting configuration identification information, cell identification information, CSI-RS resource set identification information, and instruction information indicating whether the L1 measurement operation or L1 measurement reporting operation is enabled.

13. In a terminal controlling mobility operations, A receiver that receives an RRC message from a base station including initial state instruction information indicating the initial state of an L1 measurement operation or an L1 measurement reporting operation in an LTM procedure; and A control unit that determines whether to apply or configure the L1 measurement operation or L1 measurement reporting operation according to the RRC message based on the initial state instruction information above, The receiver further receives a MAC CE indicating whether the L1 measurement operation is activated or whether the L1 measurement reporting operation is activated, and The above control unit is a terminal that enables or disables the L1 measurement operation or L1 measurement reporting operation based on the MAC CE.

14. In Paragraph 13, The above initial state indication information is, A terminal comprising information indicating whether to initially enable the L1 measurement operation or the L1 measurement reporting operation for a CSI-RS resource set associated with one or more of an LTM candidate configuration, an LTM CSI resource configuration, and an LTM CSI reporting configuration.

15. In Paragraph 13, The above MAC CE is, A terminal comprising instruction information indicating whether to enable the L1 measurement operation or L1 measurement reporting operation for a CSI-RS resource set associated with one or more of an LTM candidate configuration, an LTM CSI resource configuration, and an LTM CSI reporting configuration.

16. In Paragraph 15, The above instruction information is, A terminal that indicates whether to enable the above LTM candidate configuration, the above LTM CSI resource configuration, or the above LTM CSI reporting configuration.

17. In Paragraph 16, For each LTM candidate configuration, each LTM CSI resource configuration, or each LTM CSI reporting configuration, one or more of the above CSI-RS resource sets are linked and configured, A terminal in which the L1 measurement operation or L1 measurement reporting operation is enabled or disabled according to the activation status indicated by the instruction information for each of the above one or more CSI-RS resource sets.

18. In Paragraph 13, The above MAC CE is, A terminal configured to be linked to the above L1 measurement reporting operation based on periodic or event triggers.

19. In Paragraph 13, The above MAC CE is, A terminal comprising at least one of LTM candidate configuration identification information, LTM CSI resource configuration identification information, LTM CSI reporting configuration identification information, cell identification information, CSI-RS resource set identification information, and instruction information indicating whether the L1 measurement operation or L1 measurement reporting operation is enabled.

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