Method and apparatus for using higher-layer event during conditional movement of user equipment in wireless communication system

Abstract

The present disclosure relates to a 5G or 6G communication system for supporting higher data transmission rates. According to an embodiment, a method carried out by a user equipment in a wireless communication system may comprise the steps of: receiving, from a base station, conditional layer 1 / 2 triggered mobility (CLTM) configuration information including information about a measurement object for CLTM and information about a condition of the CLTM; measuring a candidate cell and a candidate beam on the basis of the information about the measurement object; on the basis of measurement results of the candidate cell and the candidate beam, identifying that the indicated condition of the CLTM is satisfied; and carrying out an LTM procedure or a CLTM cell switch procedure for the candidate cell on the basis of the candidate beam.

Description

Method and apparatus for using upper-layer events when performing conditional movement of a terminal in a wireless communication system

[0001] The present disclosure relates to the operation of a terminal in a mobile communication system. Specifically, the present disclosure relates to a method and apparatus for utilizing an upper layer event when performing conditional movement of a terminal in a wireless communication system.

[0002] 5G mobile communication technology defines a wide frequency band to enable fast transmission speeds and new services, and can be implemented not only in frequency bands below 6 GHz ('Sub 6 GHz'), such as 3.5 gigahertz (3.5 GHz), but also in ultra-high frequency bands called millimeter waves (mmWave), such as 28 GHz and 39 GHz ('Above 6 GHz'). In addition, for 6G mobile communication technology, which is referred to as a system beyond 5G, implementation in the terahertz band (e.g., the 3 terahertz (3 THz) band at 95 GHz) is being considered to achieve transmission speeds 50 times faster and ultra-low latency reduced to one-tenth compared to 5G mobile communication technology.

[0003] In the early stages of 5G mobile communication technology, aiming to satisfy service support and performance requirements for enhanced Mobile BroadBand (eMBB), Ultra-Reliable Low-Latency Communications (URLLC), and Massive Machine-Type Communications (mMTC), technologies included beamforming and Massive MIMO to mitigate path loss and increase transmission distance in ultra-high frequency bands; support for various numerologies (such as operating multiple subcarrier spacings) and dynamic operation of slot formats for the efficient utilization of ultra-high frequency resources; initial access techniques to support multi-beam transmission and broadband; the definition and operation of Band-Width Parts (BWP); Low Density Parity Check (LDPC) codes for high-volume data transmission; new channel coding methods such as Polar Codes for the reliable transmission of control information; and L2 pre-processing (L2 Standardization has been carried out for pre-processing, network slicing which provides a dedicated network specialized for specific services, and other methods.

[0004] Currently, discussions are underway to improve and enhance the performance of the initial 5G mobile communication technology, taking into account the services that the 5G mobile communication technology was intended to support. Additionally, standardization of the physical layer is in progress for technologies such as V2X (Vehicle-to-Everything), which helps autonomous vehicles make driving decisions and enhance user convenience based on their own location and status information transmitted by the vehicle; NR-U (New Radio Unlicensed), which aims for system operation in unlicensed bands to comply with various regulatory requirements; NR terminal low power consumption technology (UE Power Saving); Non-Terrestrial Network (NTN), which is direct terminal-satellite communication for securing coverage in areas where communication with the terrestrial network is impossible; and positioning.

[0005] In addition, standardization is underway in the field of wireless interface architecture / protocols for technologies such as the Industrial Internet of Things (IIoT) to support new services through linkage and convergence with other industries, Integrated Access and Backhaul (IAB) which provides nodes to expand network service areas by integrating wireless backhaul links and access links, Mobility Enhancement including Conditional Handover and Dual Active Protocol Stack (DAPS) Handover, and 2-step Random Access (2-step RACH for NR) which simplifies random access procedures. Standardization is also underway in the field of system architecture / services for 5G baseline architectures (e.g., Service based Architecture, Service based Interface) to incorporate Network Functions Virtualization (NFV) and Software-Defined Networking (SDN) technologies, and Mobile Edge Computing (MEC), which provides services based on the location of the terminal.

[0006] When such 5G mobile communication systems are commercialized, connected devices, which are increasing explosively, will be connected to communication networks. Accordingly, it is expected that there will be a need to enhance the functionality and performance of 5G mobile communication systems and to integrate the operation of connected devices. To this end, new research is planned to be conducted on 5G performance improvement and complexity reduction, support for AI services, support for metaverse services, and drone communication using eXtended Reality (XR), Artificial Intelligence (AI), and Machine Learning (ML) to efficiently support Augmented Reality (AR), Virtual Reality (VR), and Mixed Reality (MR).

[0007] Furthermore, the advancement of these 5G mobile communication systems encompasses multi-antenna transmission technologies such as new waveforms, Full Dimensional MIMO (FD-MIMO), array antennas, and large-scale antennas to guarantee coverage in the terahertz band of 6G mobile communication technology; metamaterial-based lenses and antennas; high-dimensional spatial multiplexing technology using Orbital Angular Momentum (OAM); and Reconfigurable Intelligent Surface (RIS) technology to improve terahertz band signal coverage; as well as full-duplex technology for enhancing frequency efficiency and system networks in 6G mobile communication technology; AI-based communication technologies that realize system optimization by utilizing satellites and Artificial Intelligence (AI) from the design stage and internalizing end-to-end AI support functions; and the realization of services of complexity exceeding the limits of terminal computing capabilities by utilizing ultra-high-performance communication and computing resources. It could serve as a foundation for the development of next-generation distributed computing technologies.

[0008] As a result of the aforementioned developments and advancements in mobile communication systems, it has become possible to provide a variety of services, and thus measures to effectively provide these services are required.

[0009] The present disclosure aims to provide an apparatus and method capable of effectively providing services in a mobile communication system.

[0010] According to one embodiment, a method performed by a terminal (user equipment) in a wireless communication system may include: receiving CLTM setting information from a base station, the information including information regarding a measurement object for a conditional LTM (layer 1 / 2 triggered mobility) (CLTM) and information regarding a condition of said CLTM; performing a measurement of a candidate cell and a candidate beam based on the information regarding the measurement object; identifying that the condition of said indicated CLTM is satisfied based on the measurement results of said candidate cell and said candidate beam; and performing an LTM procedure or a CLTM cell switch procedure for said candidate cell based on said candidate beam.

[0011] According to one embodiment, the user equipment may include at least one transceiver, at least one processor communicatively coupled to the at least one transceiver, and at least one memory communicatively coupled to the at least one processor for storing instructions. The above instructions may be executed individually or in any combination by the at least one processor so that the terminal receives CLTM configuration information from a base station, which includes information regarding a measurement object for a conditional LTM (layer 1 / 2 triggered mobility) (CLTM) and information regarding a condition of the CLTM; performs measurements on candidate cells and candidate beams based on the information regarding the measurement object; identifies that the indicated CLTM condition is satisfied based on the measurement results for the candidate cells and candidate beams; and performs an LTM procedure or a CLTM cell switch procedure for the candidate cells based on the candidate beams.

[0012] The disclosed embodiments provide an apparatus and method capable of effectively providing services in a mobile communication system.

[0013] FIG. 1 is a drawing illustrating the structure of an LTE system according to one embodiment of the present disclosure.

[0014] FIG. 2 is a diagram showing the wireless protocol structure of an LTE system according to one embodiment of the present disclosure.

[0015] FIG. 3 is a drawing illustrating the structure of a next-generation mobile communication system according to one embodiment of the present disclosure.

[0016] FIG. 4 is a diagram showing the wireless protocol structure of a next-generation mobile communication system according to one embodiment of the present disclosure.

[0017] FIG. 5 is a block diagram illustrating the internal structure of a terminal according to one embodiment of the present disclosure.

[0018] FIG. 6 is a block diagram showing the configuration of an NR base station according to one embodiment of the present disclosure.

[0019] FIG. 7 is a diagram illustrating how a condition is associated with a candidate cell in a mobility procedure of a terminal according to one embodiment of the present disclosure.

[0020] FIG. 8 illustrates the operation according to a candidate cell indication method, a measurement beam indication method, and a condition indication method according to one embodiment of the present disclosure.

[0021] FIG. 9 illustrates the operation according to a candidate cell indication method, a measurement beam indication method, and a condition indication method according to one embodiment of the present disclosure.

[0022] FIG. 10 illustrates the operation according to a candidate cell indication method, a measurement beam indication method, and a condition indication method according to one embodiment of the present disclosure.

[0023] FIG. 11 illustrates the operation according to a candidate cell indication method, a measurement beam indication method, and a condition indication method according to one embodiment of the present disclosure.

[0024] FIG. 12 illustrates the operation according to a candidate cell indication method, a measurement beam indication method, and a condition indication method according to one embodiment of the present disclosure.

[0025] FIG. 13 illustrates a procedure performed by a terminal when the CLTM-related setting information according to one embodiment of the present disclosure is given to the terminal.

[0026] FIG. 14 illustrates a procedure for determining a target cell and a target beam based on information received by a terminal according to one embodiment of the present disclosure to perform a CLTM operation.

[0027] FIG. 15 illustrates a procedure for CLTM in a terminal and a network according to one embodiment of the present disclosure.

[0028] The operating principle of the present invention will be described in detail below with reference to the attached drawings. In describing the present invention below, specific descriptions of related known functions or configurations will be omitted if it is determined that such detailed descriptions would unnecessarily obscure the essence of the invention. Furthermore, the terms described below are defined considering their functions in the present invention, and these may vary depending on the intentions or conventions of the user or operator. Therefore, their definitions should be based on the content throughout this specification.

[0029] Terms used in the following description to identify connection nodes, terms referring to network entities, terms referring to messages, terms referring to interfaces between network entities, terms referring to various identification information, etc., are examples provided for the convenience of explanation. Accordingly, the present invention is not limited to the terms described below, and other terms referring to objects having equivalent technical meanings may be used.

[0030] Hereinafter, a base station is an entity that performs resource allocation for terminals and may be at least one of a gNode B, eNode B, Node B, BS (Base Station), radio access unit, base station controller, or a node on a network. A terminal may include a UE (User Equipment), MS (Mobile Station), cellular phone, smartphone, computer, or a multimedia system capable of performing communication functions. In this disclosure, a downlink (DL) refers to a wireless transmission path of a signal transmitted by a base station to a terminal, and an uplink (UL) refers to a wireless transmission path of a signal transmitted by a terminal to a base station. Furthermore, while an LTE or LTE-A system may be described as an example below, embodiments of this disclosure may be applied to other communication systems having similar technical backgrounds or channel types. For example, 5th generation mobile communication technology (5G, new radio, NR) developed after LTE-A may be included in a system to which embodiments of this disclosure can be applied, and the 5G below may be a concept that includes existing LTE, LTE-A, and other similar services. Furthermore, the present disclosure may be applied to other communication systems with some modifications made at the discretion of a person with skilled technical knowledge, without departing significantly from the scope of the present disclosure. In this case, it will be understood that each block of the process flow diagrams and combinations of the flow diagrams may be executed by computer program instructions.

[0031] Since these computer program instructions can be loaded onto the processor of a general-purpose computer, a computer for special purposes, or other programmable data processing equipment, the instructions executed through the processor of the computer or other programmable data processing equipment create means for performing the functions described in the flowchart block(s). Since these computer program instructions can also be stored in computer-available or computer-readable memory that can be directed toward the computer or other programmable data processing equipment to implement functions in a specific way, the instructions stored in computer-available or computer-readable memory can also produce a manufactured item containing means of instruction for performing the functions described in the flowchart block(s). Since the computer program instructions can also be loaded onto the computer or other programmable data processing equipment, the instructions that perform a series of operation steps on the computer or other programmable data processing equipment to create a computer-executable process can also provide steps for performing the functions described in the flowchart block(s).

[0032] Additionally, each block may represent a module, segment, or part of code containing one or more executable instructions for executing a specific logical function(s). Also, it should be noted that in some alternative execution examples, the functions mentioned in the blocks may occur out of order. For example, two blocks described in succession may actually be executed substantially simultaneously, or the blocks may be executed in reverse order depending on the corresponding function. In this case, the term "part" as used in this embodiment refers to software or hardware components such as a Field Programmable Gate Array (FPGA) or an Application Specific Integrated Circuit (ASIC), and the "part" may perform certain roles. However, the meaning of "part" is not limited to software or hardware. The "part" may be configured to reside in an addressable storage medium or configured to run one or more processors. Accordingly, as an example, 'part' includes components such as software components, object-oriented software components, class components, and task components, as well as processes, functions, attributes, procedures, subroutines, segments of program code, drivers, firmware, microcode, circuits, data, databases, data structures, tables, arrays, and variables. The functions provided within the components and 'parts' may be combined into a smaller number of components and 'parts' or further separated into additional components and 'parts'. Furthermore, the components and 'parts' may be implemented to utilize one or more CPUs within a device or secure multimedia card. Additionally, in an embodiment, 'part' may include one or more processors.

[0033] For the convenience of the following explanation, the present invention uses terms and names defined in the 5GS and NR specifications, which are standards defined by the 3GPP (The 3rd Generation Partnership Project) organization among existing communication standards. However, the present invention is not limited by the above terms and names and can be applied in the same way to wireless communication networks according to other standards. For example, the present invention can be applied to 3GPP 5GS / NR (5th generation mobile communication standard).

[0034] If there is no capability in the lower layer for the terminal's mobility, the terminal can command lower layer movement using the result report of the measurement set in the upper layer. In this case, there is a probability that a movement command in a band such as FR 2 / 3 will fail to receive.

[0035] Accordingly, the present disclosure aims to provide a method that enables a terminal to execute movement commands without problems even in a high-frequency band.

[0036] FIG. 1 is a drawing illustrating the structure of an LTE system according to one embodiment of the present disclosure.

[0037] Referring to FIG. 1, as illustrated, the wireless access network of the LTE system may be composed of a next-generation base station (Evolved Node B, hereinafter ENB, Node B or base station) (1-05, 1-10, 1-15, 1-20), a Mobility Management Entity (MME) (1-25), and an S-GW (1-30, Serving-Gateway). A user terminal (User Equipment, hereinafter UE or terminal) (1-35) can connect to an external network through the ENB (1-05 to 1-20) and the S-GW (1-30).

[0038] In FIG. 1, the ENBs (1a-05 to 1a-20) can correspond to the existing Node B of a UMTS (universal mobile telecommunication system) system. The ENBs are connected to the UEs (1a-35) via a wireless channel and can perform more complex roles than the existing Node Bs. In an LTE system, all user traffic, including real-time services such as VoIP (Voice over IP) via the Internet Protocol, can be serviced through a shared channel. Therefore, a device is required to collect status information such as the buffer status, available transmission power status, and channel status of the UEs to perform scheduling, and this can be handled by the ENBs (1a-05 to 1a-20). A single ENB can typically control buck cells. For example, to achieve a transmission speed of 100 Mbps, the LTE system can use Orthogonal Frequency Division Multiplexing (OFDM) as a wireless access technology in a 20 MHz bandwidth. Of course, the above examples are not limited. Additionally, the ENB (1a-05 to 1a-20) may apply an Adaptive Modulation & Coding (AMC) method that determines the modulation scheme and channel coding rate according to the channel conditions of the terminal. The S-GW (serving gateway) (1a-30) is a device that provides a data bearer and can create or remove the data bearer under the control of the MME (mobility management entity) (1a-25). The MME is a device responsible for various control functions as well as mobility management functions for the terminal and can be connected to multiple base stations.

[0039] FIG. 2 is a diagram showing the wireless protocol structure of an LTE system according to one embodiment of the present disclosure.

[0040] Referring to FIG. 2, the wireless protocol of the LTE system may include Packet Data Convergence Protocol (PDCP) (2-05, 2-40), Radio Link Control (RLC) (2-10, 2-35), Medium Access Control (MAC) (2-15, 2-30), and Physical (PHY) (2-20, 2-25) layers at the terminal and ENB, respectively. Of course, the wireless protocol of the LTE system may include more or fewer layers than the configuration shown in FIG. 2.

[0041] According to one embodiment of the present disclosure, PDCP (2-05, 2-40) may be responsible for operations such as IP header compression / recovery. The main functions of PDCP (2-05, 2-40) can be summarized as follows. Of course, it is not limited to the following examples. Of course, it is not limited to the following examples.

[0042] - Header compression and decompression (ROHC (robust header compression) only)

[0043] - User data transfer function (Transfer of user data)

[0044] - Sequential delivery function (In-sequence delivery of upper layer PDUs at PDCP re-establishment procedure for RLC AM (acknowledge mode))

[0045] - Order reordering function (For split bearers in DC (only support for RLC AM): PDCP PDU routing for transmission and PDCP PDU reordering for reception)

[0046] - Duplicate detection function (Duplicate detection of lower layer SDUs at PDCP re-establishment procedure for RLC AM)

[0047] - Retransmission function (Retransmission of PDCP SDUs at handover and, for split bearers in DC, of ​​PDCP PDUs at PDCP data-recovery procedure, for RLC AM)

[0048] - Encryption and decryption functions (Ciphering and deciphering)

[0049] - Timer-based SDU discard in uplink.

[0050] According to one embodiment of the present disclosure, Radio Link Control (RLC) (2-10, 2-35) can reconfigure a PDCP Packet Data Unit (PDU) to an appropriate size to perform ARQ operations, etc. The main functions of the RLC can be summarized as follows. Of course, it is not limited to the following examples.

[0051] - Data transfer function (Transfer of upper layer PDUs)

[0052] - ARQ function (Error Correction through ARQ (only for AM data transfer))

[0053] - Concatenation, segmentation, and reassembly functions (Concatenation, segmentation, and reassembly of RLC SDUs (only for UM and AM data transfer))

[0054] - Re-segmentation function (Re-segmentation of RLC data PDUs (only for AM data transfer))

[0055] - Reordering function (Reordering of RLC data PDUs (only for UM and AM data transfer)

[0056] - Duplicate detection function (only for UM and AM data transfer)

[0057] - Error detection function (Protocol error detection (only for AM data transfer))

[0058] - RLC SDU deletion function (RLC SDU discard (only for UM and AM data transfer))

[0059] RLC re-establishment function

[0060] According to one embodiment of the present disclosure, a MAC (2-15, 2-30) is connected to multiple RLC layer devices configured in a terminal and can perform operations of multiplexing RLC PDUs to a MAC PDU and demultiplexing RLC PDUs from a MAC PDU. The main functions of the MAC (2-15, 2-30) can be summarized as follows. Of course, it is not limited to the following examples.

[0061] - Mapping function (Mapping between logical channels and transport channels)

[0062] - Multiplexing and demultiplexing function (Multiplexing / demultiplexing of MAC SDUs belonging to one or different logical channels into / from transport blocks (TB) delivered to / from the physical layer on transport channels)

[0063] - Scheduling information reporting function

[0064] - HARQ function (Error correction through HARQ)

[0065] - Priority handling between logical channels of one UE

[0066] - Priority handling between UEs by means of dynamic scheduling

[0067] - MBMS service identification function

[0068] - Transport format selection function

[0069] - Padding

[0070] According to one embodiment of the present disclosure, the physical layer (2-20, 2-25) may perform the operation of channel coding and modulating upper layer data, creating OFDM symbols and transmitting them over a wireless channel, or demodulating OFDM symbols received through a wireless channel and channel decoding them to transmit them to an upper layer. Of course, it is not limited to the following examples.

[0071] FIG. 3 is a drawing illustrating the structure of a next-generation mobile communication system according to one embodiment of the present disclosure.

[0072] Referring to FIG. 3, the wireless access network of a next-generation mobile communication system (hereinafter NR or 5G) may be composed of a next-generation base station (New Radio Node B, hereinafter NR gNB or NR base station) (3-10) and a next-generation wireless core network (New Radio Core Network, NR CN) (3-05). A next-generation wireless user terminal (New Radio User Equipment, NR UE or terminal) (3-15) can connect to an external network through the NR gNB (3-10) and the NR CN (3-05).

[0073] In FIG. 3, the NR gNB (3-10) can correspond to the eNB (Evolved Node B) of an existing LTE system. The NR gNB is connected to the NR UE (3-15) via a wireless channel and can provide superior service compared to the existing Node B. In a next-generation mobile communication system, all user traffic can be serviced through a shared channel. Therefore, a device is required to collect status information such as the buffer status, available transmission power status, and channel status of the UEs to perform scheduling, and the NR NB (3-10) can handle the scheduling. A single NR gNB can control multiple cells.

[0074] According to one embodiment of the present disclosure, in a next-generation mobile communication system, a bandwidth greater than the typical maximum bandwidth may be applied to achieve ultra-high-speed data transmission compared to general LTE. Additionally, beamforming technology may be incorporated by using Orthogonal Frequency Division Multiplexing (OFDM) as a wireless access technology.

[0075] In addition, according to one embodiment of the present disclosure, the NR gNB may be subjected to an Adaptive Modulation & Coding (hereinafter referred to as AMC) method that determines a modulation scheme and a channel coding rate according to the channel conditions of the terminal. The NR CN (3-05) can perform functions such as mobility support, bearer configuration, and QoS (Quality of Service) configuration. The NR CN is a device responsible for various control functions as well as mobility management functions for the terminal and can be connected to multiple base stations. In addition, the next-generation mobile communication system can be interoperable with an LTE system, and the NR CN can be connected to the MME (3-25) via a network interface. The MME (3-25) can be connected to the eNB (3-30), which is an LTE base station.

[0076] FIG. 4 is a diagram showing the wireless protocol structure of a next-generation mobile communication system according to one embodiment of the present disclosure.

[0077] It may include Service Data Adaptation Protocol (SDAP) (4-01, 4-45), NR PDCP (4-05, 4-40), NR RLC (4-10, 4-35), NR MAC (4-15, 4-30), and NR PHY (4-20, 4-25) layers. Of course, the wireless protocol of the next-generation mobile communication system may include more or fewer layers than the configuration shown in FIG. 4.

[0078] According to one embodiment of the present disclosure, the main functions of the SDAP (4-01, 4-45) layer device of NR may include some of the following functions, provided that they are not limited to the examples below.

[0079] - User data transfer function (transfer of user plane data)

[0080] - Mapping function between a QoS flow and a DRB for both DL and UL for uplink and downlink

[0081] - Marking QoS flow ID in both DL and UL packets for uplink and downlink

[0082] - Function to map reflective QoS flow to data bearers for uplink SDAP PDUs (reflective QoS flow to DRB mapping for the UL SDAP PDUs).

[0083] For SDAP layer devices (4-01, 4-45) (hereinafter referred to interchangeably as layer and layer device), the terminal may receive a Radio Resource Control (RRC) message indicating whether to use the header of the SDAP layer device or the functions of the SDAP layer device for each PDCP layer device, for each bearer, or for each logical channel. Additionally, if the SDAP header is configured for the SDAP layer device (4-01, 4-45), the terminal may be instructed to update or reset the mapping information for the QoS flows of the uplink and downlink and the data bearer using the 1-bit indicator for the Non-Access Stratum (NAS) Quality of Service (QoS) reflection setting (NAS reflective QoS) and the 1-bit indicator for the Access Stratum (AS) QoS reflection setting (AS reflective QoS) of the SDAP header. According to one embodiment, the SDAP header may include QoS flow ID information indicating QoS. According to one embodiment, QoS information can be used for data processing priority, scheduling information, etc. to support smooth service.

[0084] According to one embodiment of the present disclosure, the main functions of an NR PDCP (4-05, 4-40) layer device may include some of the following functions, provided that they are not limited to the examples below.

[0085] - Header compression and decompression features (ROHC only)

[0086] - User data transfer function (Transfer of user data)

[0087] - Sequential delivery function (In-sequence delivery of upper layer PDUs)

[0088] - Out-of-sequence delivery of upper layer PDUs

[0089] - Reordering function (PDCP PDU reordering for reception)

[0090] - Duplicate detection function (Duplicate detection of lower layer SDUs)

[0091] - Retransmission of PDCP SDUs

[0092] - Encryption and decryption functions (Ciphering and deciphering)

[0093] - Timer-based SDU discard in uplink.

[0094] In the above description, the reordering function of the NR PDCP layer device (4-05, 4-40) may mean a function of reordering PDCP PDUs received from the lower layer in order based on the PDCP SN (sequence number). The reordering function of the NR PDCP layer device (4-05, 4-40) may include at least one of the following: a function of transmitting data to the upper layer in the reordered order; a function of transmitting immediately without considering the order; a function of recording lost PDCP PDUs by reordering the order; a function of reporting the status of lost PDCP PDUs to the transmitting side; and a function of requesting retransmission of lost PDCP PDUs.

[0095] According to one embodiment of the present disclosure, the main functions of an NR RLC layer device (4-10, 4-35) may include some of the following functions, provided that they are not limited to the examples below.

[0096] - Data transfer function (Transfer of upper layer PDUs)

[0097] - Sequential delivery function (In-sequence delivery of upper layer PDUs)

[0098] - Out-of-sequence delivery of upper layer PDUs

[0099] - ARQ function (Error Correction through ARQ)

[0100] - Concatenation, segmentation, and reassembly functions of RLC SDUs

[0101] - Re-segmentation function (Re-segmentation of RLC data PDUs)

[0102] - Reordering function (Reordering of RLC data PDUs)

[0103] - Duplicate detection

[0104] - Error detection function (Protocol error detection)

[0105] - RLC SDU discard function

[0106] RLC re-establishment function

[0107] In the above description, the in-sequence delivery function of the NR RLC layer device (4-10, 4-35) may mean a function of delivering RLC SDUs received from a lower layer to an upper layer in order. In the case where a single RLC SDU is originally received divided into multiple RLC SDUs, the in-sequence delivery function of the NR RLC device (4-10, 4-35) may include a function of reassembling and delivering them.

[0108] According to one embodiment of the present disclosure, the in-sequence delivery function of the NR RLC layer device (4-10, 4-35) may include at least one of the following: a function of rearranging received RLC PDUs based on an RLC SN (sequence number) or a PDCP SN (sequence number); a function of recording lost RLC PDUs by rearranging the order; a function of reporting the status of lost RLC PDUs to the transmitting side; and a function of requesting retransmission of lost RLC PDUs.

[0109] According to one embodiment of the present disclosure, the in-sequence delivery function of the NR RLC layer device (4-10, 4-35) may include a function to sequentially deliver only the RLC SDUs up to the RLC SDU prior to the lost RLC SDU to the upper layer when there is a lost RLC SDU.

[0110] According to one embodiment of the present disclosure, the in-sequence delivery function of the NR RLC layer device (4-10, 4-35) may include the function of delivering all RLC SDUs received before the timer started to the upper layer in order, even if there are lost RLC SDUs, if a predetermined timer has expired.

[0111] According to one embodiment of the present disclosure, the in-sequence delivery function of the NR RLC layer device (4-10, 4-35) may include the function of delivering all RLC SDUs received up to that point to the upper layer in order when a predetermined timer expires, even if there are lost RLC SDUs.

[0112] According to one embodiment of the present disclosure, an NR RLC layer device (4-10, 4-35) can process RLC PDUs in the order in which they are received and deliver them to an NR PDCP layer device, regardless of the sequence number (Out-of-sequence delivery).

[0113] According to one embodiment of the present disclosure, when an NR RLC layer device (4-10, 4-35) receives a segment, it may receive segments stored in a buffer or to be received later, reconstruct them into a single complete RLC PDU, and then transmit it to an NR PDCP device.

[0114] According to one embodiment of the present disclosure, the NR RLC layer device (4-10, 4-35) may not include a concatenation function and may perform a function in the NR MAC layer or be replaced by a multiplexing function of the NR MAC layer.

[0115] In the above description, the out-of-sequence delivery function of the NR RLC layer device (4-10, 4-35) may mean a function of delivering RLC SDUs received from a lower layer directly to an upper layer regardless of order. The out-of-sequence delivery function of the NR RLC layer device (4-10, 4-35) may include a function of reassembling and delivering RLC SDUs when a single RLC SDU is originally received divided into multiple RLC SDUs. The out-of-sequence delivery function of the NR RLC layer device (4-10, 4-35) may include a function of storing the RLC SN or PDCP SN of the received RLC PDUs, sorting the order, and recording the lost RLC PDUs.

[0116] According to one embodiment of the present disclosure, an NR MAC layer device (4-15, 4-30) may be connected to multiple NR RLC layer devices configured in a terminal, and the main functions of the NR MAC layer device (4-15, 4-30) may include some of the following functions, provided, but not limited to the examples below.

[0117] - Mapping function (Mapping between logical channels and transport channels)

[0118] - Multiplexing and demultiplexing functions (Multiplexing / demultiplexing of MAC SDUs)

[0119] - Scheduling information reporting function

[0120] - HARQ function (Error correction through HARQ)

[0121] - Priority handling between logical channels of one UE

[0122] - Priority handling between UEs by means of dynamic scheduling

[0123] - MBMS service identification function

[0124] - Transport format selection function

[0125] - Padding

[0126] According to one embodiment of the present disclosure, an NR PHY layer device (4-20, 4-25) can perform the operation of channel coding and modulating upper layer data, making it into an OFDM symbol and transmitting it to a wireless channel, or demodulating and channel decoding an OFDM symbol received through a wireless channel and transmitting it to an upper layer.

[0127] FIG. 5 is a block diagram illustrating the structure of a terminal according to one embodiment of the present disclosure.

[0128] Referring to FIG. 5, the terminal may include an RF (Radio Frequency) processing unit (5-10), a baseband processing unit (5-20), a storage unit (5-30), and a control unit (5-40). Of course, it is not limited to the above example, and the terminal may include fewer or more configurations than the configuration shown in FIG. 5.

[0129] The RF processing unit (5-10) performs functions for transmitting and receiving signals through a wireless channel, such as signal band conversion and amplification. The RF processing unit (5-10) can up-convert a baseband signal provided by the baseband processing unit (5-20) into an RF band signal and transmit it through an antenna, and down-convert an RF band signal received through an antenna into a baseband signal. For example, the RF processing unit (5-10) may include a transmission filter, a reception filter, an amplifier, a mixer, an oscillator, a DAC (digital to analog converter), an ADC (analog to digital converter), etc. Although only one antenna is shown in FIG. 5, the terminal may be equipped with multiple antennas. Additionally, the RF processing unit (5-10) may include multiple RF chains. Furthermore, the RF processing unit (5-10) may perform beamforming. For beamforming, the RF processing unit (5-10) can adjust the phase and magnitude of each of the signals transmitted and received through multiple antennas or antenna elements. Additionally, the RF processing unit (5-10) can perform MIMO and can receive multiple layers when performing MIMO operation. The RF processing unit (5-10) can perform receiving beam sweeping by appropriately setting multiple antennas or antenna elements according to the control of the control unit, or can adjust the direction and beam width of the receiving beam so that the receiving beam is coordinated with the transmitting beam.

[0130] The baseband processing unit (5-20) can perform conversion functions between baseband signals and bit sequences according to the physical layer specifications of the system. For example, when transmitting data, the baseband processing unit (5-20) can generate complex symbols by encoding and modulating the transmitted bit sequence. Additionally, when receiving data, the baseband processing unit (5-20) can restore the received bit sequence by demodulating and decoding the baseband signal provided by the RF processing unit (5-10). For example, in the case of following the orthogonal frequency division multiplexing (OFDM) method, when transmitting data, the baseband processing unit (5-20) can generate complex symbols by encoding and modulating the transmitted bit sequence, map the complex symbols to subcarriers, and then construct OFDM symbols through inverse fast Fourier transform (IFFT) operations and cyclic prefix (CP) insertion. Additionally, upon receiving data, the baseband processing unit (5-20) can divide the baseband signal provided by the RF processing unit (5-10) into OFDM symbol units, restore the signals mapped to subcarriers through the FFT (fast Fourier transform), and then restore the received bit sequence through demodulation and decoding.

[0131] The baseband processing unit (5-20) and the RF processing unit (5-10) transmit and receive signals as described above. Accordingly, the baseband processing unit (5-20) and the RF processing unit (5-10) may be referred to as a transmitting unit, a receiving unit, a transmitting and receiving unit, or a communication unit. Furthermore, at least one of the baseband processing unit (5-20) and the RF processing unit (5-10) may include a plurality of communication modules to support a plurality of different wireless access technologies. Additionally, at least one of the baseband processing unit (5-20) and the RF processing unit (5-10) may include different communication modules to process signals of different frequency bands. For example, different wireless access technologies may include wireless LAN (e.g., IEEE 802.11), cellular network (e.g., LTE), etc. In addition, the above different frequency bands may include super high frequency (SHF) bands (e.g., 2.NRHz, NRHz) and millimeter wave (e.g., 60GHz) bands. The terminal can transmit and receive signals with a base station using a baseband processing unit (2e-20) and an RF processing unit (2e-10), and the signals may include control information and data.

[0132] The storage unit (5-30) can store data such as basic programs, application programs, and setting information for the operation of the terminal. In particular, the storage unit (5-30) can store information related to a second connection node that performs wireless communication using a second wireless connection technology. Additionally, the storage unit (5-30) can provide the stored data upon a request from the control unit (5-40). The storage unit (5-30) may be composed of a storage medium or a combination of storage media such as ROM, RAM, hard disk, CD-ROM, and DVD. According to one embodiment, the storage unit (5-30) may store a program for performing the embodiment described in this disclosure.

[0133] The control unit (5-40) can control the overall operations of the terminal. For example, the control unit (5-40) can transmit and receive signals through the baseband processing unit (5-20) and the RF processing unit (5-10). Additionally, the control unit (5-40) writes and reads data to and from the storage unit (5-40). To this end, the control unit (5-40) may include at least one processor. For example, the control unit (5-40) may include a communication processor (CP) that performs control for communication and an application processor (AP) that controls upper layers such as applications. Additionally, at least one component within the terminal may be implemented as a single chip. Also, according to one embodiment of the present disclosure, the control unit (5-40) may include a multiple connection processing unit (5-42) that performs processing for operating in a multiple connection mode. Additionally, each component of the terminal may operate to perform the embodiments of the present disclosure.

[0134] FIG. 6 is a block diagram showing the configuration of an NR base station according to one embodiment of the present disclosure.

[0135] As illustrated in FIG. 6, the base station is configured to include an RF processing unit (6-10), a baseband processing unit (6-20), a backhaul communication unit (6-30), a storage unit (6-40), and a control unit (6-50). Of course, it is not limited to the above example, and the base station may include fewer or more configurations than the configuration illustrated in FIG. 6.

[0136] The RF processing unit (6-10) can perform functions for transmitting and receiving signals through a wireless channel, such as signal band conversion and amplification. The RF processing unit (6-10) can up-convert a baseband signal provided by the baseband processing unit (6-20) into an RF band signal and transmit it through an antenna, and down-convert an RF band signal received through an antenna into a baseband signal. For example, the RF processing unit (6-10) may include a transmit filter, a receive filter, an amplifier, a mixer, an oscillator, a DAC, an ADC, etc. Although only one antenna is shown in FIG. 6, the RF processing unit (6-10) may be equipped with multiple antennas. Additionally, the RF processing unit (6-10) may include multiple RF chains. Furthermore, the RF processing unit (6-10) may perform beamforming. For beamforming, the RF processing unit (6-10) may adjust the phase and magnitude of each of the signals transmitted and received through multiple antennas or antenna elements. The RF processing unit (6-10) can perform down-to-down MIMO operation by transmitting one or more layers.

[0137] The baseband processing unit (6-20) can perform a conversion function between a baseband signal and a bit sequence according to the physical layer specifications of the first wireless access technology. For example, when transmitting data, the baseband processing unit (6-20) can generate complex symbols by encoding and modulating the transmitted bit sequence. Additionally, when receiving data, the baseband processing unit (6-20) can restore the received bit sequence by demodulating and decoding the baseband signal provided by the RF processing unit (6-10). For example, in the case of following the OFDM method, when transmitting data, the baseband processing unit (6-20) can generate complex symbols by encoding and modulating the transmitted bit sequence, map the complex symbols to subcarriers, and then construct OFDM symbols through IFFT operation and CP insertion. Additionally, upon receiving data, the baseband processing unit (6-20) can divide the baseband signal provided by the RF processing unit (6-10) into OFDM symbol units, restore the signals mapped to subcarriers through FFT operations, and then restore the received bit sequence through demodulation and decoding. The baseband processing unit (6-20) and the RF processing unit (6-10) transmit and receive signals as described above. Accordingly, the baseband processing unit (6-20) and the RF processing unit (6-10) may be referred to as a transmitting unit, a receiving unit, a transmission and reception unit, a communication unit, or a wireless communication unit. A base station can transmit and receive signals with a terminal using the baseband processing unit (6-20) and the RF processing unit (6-10), and the signal may include control information and data.

[0138] The backhaul communication unit (6-30) can provide an interface for communicating with other nodes within the network. The backhaul communication unit (6-30) can convert a bit sequence transmitted from the main base station to other nodes, such as an auxiliary base station or a core network, into a physical signal, and can convert a physical signal received from other nodes into a bit sequence. Additionally, the backhaul communication unit (6-30) may be referred to as a communication unit.

[0139] The storage unit (6-40) can store data such as basic programs, application programs, and configuration information for the operation of the base station. In particular, the storage unit (6-40) can store information regarding a bearer assigned to a connected terminal, measurement results reported from the connected terminal, etc. Additionally, the storage unit (6-40) can store information that serves as a criterion for determining whether to provide or discontinue multiple connections to the terminal. Furthermore, the storage unit (6-40) can provide the stored data upon a request from the control unit (6-50). The storage unit (6-40) may be composed of a storage medium or a combination of storage media such as ROM, RAM, a hard disk, CD-ROM, and DVD. Additionally, the storage unit (6-40) may be composed of multiple memories. According to one embodiment, the storage unit (6-40) may store a program for performing the embodiment described in this disclosure.

[0140] The control unit (6-50) can control the overall operations of the base station. For example, the control unit (6-50) transmits and receives signals through the baseband processing unit (6-20) and the RF processing unit (6-10) or through the backhaul communication unit (6-30). Additionally, the control unit (6-50) writes and reads data to and from the storage unit (6-40). To this end, the control unit (6-50) may include at least one processor. Additionally, at least one component of the base station may be implemented as a single chip. Additionally, each component of the base station may operate to perform the embodiments of the present disclosure.

[0141] Layer 1 / 2 Triggered Mobility (LTM) was introduced in Release 18 (R18) and is being improved in Release 19 (R19). During the discussions for R19, regarding the R18 LTM, it was agreed to separate the terminal's capabilities for L1 CSI configuration and measurement and reporting operations. In the procedure where the network pre-transmits information about the measurement beam for LTM candidate cells, as well as CSI measurement and reporting information for that beam, allowing the terminal to perform L1 measurement and reporting and execute LTM based on the results, the network now requires the terminal to perform L1 CSI configuration and measurement and reporting operations. Consequently, the network can now execute LTM without providing the terminal with configurations for CSI measurement and reporting specifically for LTM. Since the purpose of LTM is to instruct a move to use a specific beam in a target cell if the conditions there are better than those in the current cell, the network must, in any case, know the measurement information regarding the candidate cell's beam. To this end, measurement setting and reporting operations operated in the Radio Resource Management (RRM) of Layer 3 (L3), which is a basic capability of the terminal, can be used, and the transmission of the Measurement Report (MR) according to the RRM setting can be identified, and if a beam with good measurement results is reported among the LTM candidate cells, the network can request LTM to be performed to the cell corresponding to that beam.

[0142] In R19, discussions were initiated regarding a conditional LTM (CLTM) based on L1 measurement. The purpose is that while the cell switch command of the LTM is executed by a DL (downlink) MAC CE (Control Element), reliability may be compromised in the FR2 or FR3 bands to be discussed in 6G. Accordingly, the CLTM was designed to supplement this reliability. In the CLTM, the terminal moves using the target cell and target beam associated with the condition when the condition is satisfied under a preset condition. In this case, for a terminal that lacks the L1 measurement capability for the conditional LTM, a conditional CLTM based on L3 measurement must be designed. This disclosure provides an embodiment regarding an L3-based conditional LTM and additionally provides an embodiment regarding an L1-based conditional LTM. In the following disclosure, "network" may refer to a base station or a specific entity of the network.

[0143] Given the operation and objectives of LTM, the core of the operation of conditional LTM may be to enable the terminal to know the target cell and the target beam to be used in that cell in specific situations without a cell switch command. Accordingly, condition information for specific situations is added, and when the condition is satisfied, the requirement of the operation may be to find the target cell and the target beam in that cell according to the satisfied condition.

[0144] In LTM, the target cell and target beam transmitted via the cell switch command are determined by the network's selection based on its needs after acquiring L1 measurement results. Therefore, a beam selected by the network is chosen as the target beam if it is better than the serving beam of the currently used serving cell or if a beam from a candidate cell exceeding a certain absolute value is found. Condition information for this type of beam-based decision may need to be configured so that the terminal can determine the target beam required during LTM execution. Additionally, when configuring conditions, the network may need to decide which cell or beam to use as the measurement target. For example, in the case of conventional LTM, if the network indicates multiple specific candidate cells and specific beams within those cells as common CSI information, the terminal measures only those beams; however, the network may need to decide whether to indicate the same common CSI and assign specific conditions to that information as in conventional LTM, or to assign specific conditions to each candidate cell.

[0145] FIG. 7 is a diagram illustrating how a condition is associated with a candidate cell in a mobility procedure of a terminal according to one embodiment of the present disclosure.

[0146] In the case of conditional handover introduced in Rel-16 (Release-16), separate condition information is associated with each target cell, so that the terminal can determine whether the condition is satisfied or not by substituting the cell measurement result value of a given target cell into the given condition. In contrast, L3-based CLTM may assign one or more conditions to a group of specific candidate cells (and their beams), or one or more conditions may be assigned to each specific candidate cell.

[0147] According to one embodiment of the present disclosure, when designing an L3-based CLTM by reusing L3 RRM settings, a method of indicating a measurement ID based on an existing Management Object (MO) and report configuration as a condition may be used. The network may transmit a single measurement ID, combining a specific MO and a specific reportConfig, as a CLTM execution condition for one or more CLTM candidate cells or candidate cell groups. Such a setting may be established by linking the CLTM candidate cell settings with the measurement ID. Depending on the information included in the MO and report configuration, the network may transmit different targets measured by the terminal and condition information to be applied to those targets. The method of transmitting a measurement ID composed of an MO and a reportConfig as condition information for each candidate cell may be valid for all methods consisting of the following opt 1, 2, and 4 of the candidate cell indication method and opt 1 of the event indication method. Additionally, in the present disclosure, the measurement ID may be referred to as 'measID', but is not limited thereto.

[0148] [Candidate Cell Instruction Method]

[0149] According to one embodiment of the present disclosure, as a method for indicating a candidate cell to be subject to condition determination to a terminal in connection with an MO, the following method may be possible.

[0150] Opt 1. MO (measurement object) including explicit candidate cell with cell index, multiple candidate cell possible.

[0151] According to one embodiment of the present disclosure, when a network transmits condition information to a terminal, it may explicitly indicate a candidate cell to be measured. In this case, candidate cells existing on a specific frequency may be included in an MO indicating the corresponding frequency. In this case, the information indicating the candidate cell may be a PCI (Physical Cell Identifier) ​​and / or an LTM candidate cell ID.

[0152] Opt 4. MO including explicit single candidate cell with cell index.

[0153] According to one embodiment of the present disclosure, when a network transmits condition information to a terminal, it may explicitly indicate a candidate cell to be measured. In this case, one candidate cell existing on a specific frequency may be included in an MO indicating the corresponding frequency. In this case, the information indicating the candidate cell may be a PCI and / or LTM candidate cell ID. Accordingly, multiple MOs each containing multiple candidate cells may be required, and each of the multiple MOs may indicate the same frequency.

[0154] The difference between options 1 and 4 lies in whether a single MO includes multiple candidate cells or a single candidate cell. In the case where a single MO includes a single candidate cell, as in Opt 4, the conditions of the reportConfig associated with the MO can only be applied to that candidate cell. Therefore, to meet conditions for multiple candidate cells, multiple events and multiple reportConfigs containing them are required, and the amount of signal information needed may be greater than when multiple candidate cells are included. In the case where multiple candidate cells are included during MO configuration, as in Opt 1, the events within the reportConfig associated with the MO may be applied commonly to the corresponding candidate cells, or separate events may be designated to apply to each candidate cell. Opt 4 may violate the existing principle that only one MO is configured for a terminal for a single frequency. That is, by including different candidate cells corresponding to the same frequency in different MOs and instructing the terminal, an MO representing the same frequency can be distinguished as a different MO because it includes different candidate cells.

[0155] Opt 2. MO without explicit candidate cell, but MO or measId associated with this MO is given as condition info, and this info is associated with target cell configuration (including PCI and ARFCN in reconfigWithSync) or LTM candidate ID

[0156] According to one embodiment of the present disclosure, the MO may not include LTM candidate cell information. Instead, a meas ID consisting of a reportConfig associated with this MO may be indicated as a condition for each CLTM candidate cell. A terminal that receives the meas ID information may perform an evaluation for the corresponding candidate cell by limiting the evaluation target of the CLTM event existing in the reportConfig constituting the meas ID given to the corresponding candidate cell to the corresponding candidate cell.

[0157] For reference, the CLTM events to be mentioned later are expressed in terms of serving cell / spcell (special cell) / candidate cell / neighbor cell, and among the aforementioned expressions, a candidate cell or a neighbor cell may be considered by the terminal as a candidate cell.

[0158] Opt 3. Regardless of MO, it can be instructed to the terminal as a separate CLTM measurement target.

[0159] According to one embodiment of the present disclosure, the network may include candidate cells of a measurement target in the configuration information of the CLTM independently of or separately from the MO.

[0160] [Measurement Beam Indication Method]

[0161] According to one embodiment of the present disclosure, in the LTM, specific candidate cell information transmitted from the serving cell and candidate beam information from that cell are set to the terminal as common CSI information to perform measurements in a limited manner. When the LTM measurement beam is an SSB (Synchronization Signal / PBCH Block), information such as the SMTC (SS / PBCH Block Measurement Timing Configuration) information of surrounding cells and the activated SSB beam is already known to the serving base station and the terminal, and since it is already being transmitted from each candidate cell, a separate signal procedure for the on / off operation of the beam may not be required. However, if the target beam is a beam transmitting a CSI-RS (Channel State Information Reference Signal), the CSI-RS may be determined by agreement with the serving base station during the LTM preparation phase, and since the candidate cell will transmit the CSI-RS through specific beams based on that, the network may need to directly indicate the specific beams.

[0162] For the reasons above, CLTM may also require a limited measurement beam, and an anonymous beam or any detectable beam may be the subject of measurement. As a variation thereof, the following options may be available. According to one embodiment, the beam indication information may be indicated by an SSB index, a CSI-RS resource (set) ID, or a TCI state ID. Of course, it is not limited to the above examples.

[0163] Opt 1. there is candidate beam indication per candidate cell to measure / evaluate on the condition

[0164] According to one embodiment of the present disclosure, a candidate beam can be indicated for each candidate cell to be measured / evaluated according to conditions.

[0165] Opt 1-1. MO including explicit candidate cell, and the candidate cell associated with the selected candidate beams

[0166] According to one embodiment of the present disclosure, a specific candidate cell ID may be included in the MO, and beams associated with the candidate cell may be indicated.

[0167] Opt 1-2. the selected candidate beams per each target cell is given in the association with the configuration or LTM candidate ID

[0168] According to one embodiment of the present disclosure, a beam existing in a cell may be indicated for each candidate ID or PCI (and / or) ARFCN information for each LTM candidate cell. In this case, it may be indicated together with the candidate cell settings in the CLTM settings rather than being included in the MO.

[0169] Opt 2. There is no separate beam indication.

[0170] According to one embodiment of the present disclosure, all beams detected in the cell, rather than the directed beam for condition determination in the candidate cell, may be subject to condition determination.

[0171] [Method of indicating conditions]

[0172] According to one embodiment of the present disclosure, after identifying the measurement and evaluation targets according to the instructions of the candidate cell and beam, the terminal can perform a condition evaluation based on condition information to be applied to the target.

[0173] According to one embodiment, different options may be available depending on whether one or more events are set in the reportConfiguration field.

[0174] Opt 1. Set one CLTM event in one reportconfig.

[0175] According to one embodiment of the present disclosure, independent condition information can be set for each candidate cell. In addition, since the network requires multiple reportConfigs for multiple events, an MO for indicating a candidate cell and multiple measIds configured by each of the multiple reportConfigs can be set in the corresponding candidate cell.

[0176] Opt 2. Set multiple CLTM events in a single reportConfig.

[0177] According to one embodiment of the present disclosure, since multiple events can be set in a single reportConfig, a condition for a single candidate cell may require only one reportConfig containing multiple events, and accordingly, a single measId composed of MO and this reportConfig may be set as a condition for the corresponding candidate cell. However, there may be multiple conditions for evaluation.

[0178] The following are examples of events considered under the above conditions. Of course, they are not limited to the examples below.

[0179] Event CLTM1: beam of serving cell becomes better than threshold

[0180] Event CLTM2: Beam of serving cell becomes worse than absolute threshold;

[0181] Event CLTM3: Beam of candidate cell becomes amount of offset better than beam of serving cell / spcell;

[0182] Event CLTM4: Beam of candidate cell becomes better than absolute threshold;

[0183] Event CLTM5: Beam of serving cell / spcell becomes worse than absolute threshold1 AND Beam of candidate cell becomes better than another absolute threshold2.

[0184] In the aforementioned event, the beam of the serving cell may refer to the currently served beam of the serving cell or spcell to which the terminal belongs.

[0185] In the aforementioned event, the beam of the candidate cell is

[0186] - In the case of opt 1 among the measurement beam indication methods, it can be one of the indicated beams of the corresponding cell.

[0187] - Among the measurement beam indication methods, opt 2, that is, when there is no separate beam indication, it can be one of all detectable beams in the cell.

[0188] According to one embodiment of the present disclosure, since the determination of the condition of a given event is based on a measured beam unit, it can be assumed that the condition is satisfied when the beam satisfies the given condition in the state where each beam is measured, or at the time when the beam satisfies the condition. Accordingly, the target beam of a target cell that satisfies the condition is,

[0189] - It is the beam found at the time when any beam satisfying the given conditions is discovered (i.e., the first beam found satisfying the conditions in the terminal's beam measurement order, without the need to sort whether it is the best beam among all beams).

[0190] - Among the indicated beams or all detectable beams, it may mean the best beam among the beams of the target cell that satisfy the above conditions. In this case, since it means the beam that has the best result first in order based on the measurement results of all beams, it may be a different beam from the case where the beam satisfying the conditions of the first bullet is found.

[0191] - Or it may be any beam arbitrarily selected by the terminal among the beams satisfying the corresponding condition.

[0192] The operations of the aforementioned beam selection option can allow the network to set an indicator for each case to the terminal.

[0193] In addition, according to one embodiment, at least one of the following additional parameters may be indicated for each of the aforementioned events.

[0194] Entry Condition:

[0195] - For Event CLTM1, if the value obtained by subtracting the hysteresis value from the beam-specific measurement value of the serving cell is greater than the threshold value.

[0196] - For Event CLTM2, if the sum of the hysteresis value and the beam-specific measurement of the serving cell is less than the threshold

[0197] -Event CLTM3: If the result of adding the frequency-specific offset value to the beam-specific measurement of each indicated candidate cell, adding the candidate cell-specific offset value, adding the beam-specific offset value, and subtracting the hysteresis value is greater than the result of adding the serving cell frequency-specific offset value to the beam-specific measurement of the serving cell, adding the serving cell-specific offset value, adding the beam-specific offset value, and adding the event-specific offset value

[0198] -Event CLTM4: If the value obtained by adding the frequency-specific offset value to the beam-specific measurement value of each indicated candidate cell, adding the candidate cell-specific offset value, adding the beam-specific offset value, and subtracting the hysteresis value is greater than the threshold

[0199] -Event CLTM5: If the value obtained by adding the hysteresis value to the beam-specific measurements of the serving cell (optional, adding the beam-specific offset value) is less than threshold 1, and the value obtained by adding the frequency-specific offset value to the beam-specific measurements of each indicated candidate cell, adding the cell-specific offset value, adding the beam-specific offset value, and subtracting the hysteresis value is greater than 2.

[0200] Leaving condition:

[0201] - For Event CLTM1, if the sum of the hysteresis values ​​in the beam-specific measurements of the serving cell is less than the threshold value.

[0202] - For Event CLTM2, if the value obtained by subtracting the hysteresis value from the beam-specific measurements of the serving cell is greater than the threshold

[0203] -Event CLTM3: If the sum of the frequency-specific offset value, candidate cell-specific offset value, each beam-specific offset value, and hysteresis value added to the beam-specific measurement value of each indicated candidate cell is less than the sum of the serving cell frequency-specific offset value, serving cell-specific offset value, each beam-specific offset value, and event-specific offset value added to the serving cell beam-specific measurement value

[0204] -Event CLTM4: If the sum of the frequency-specific offset value, the candidate cell-specific offset value, the beam-specific offset value, and the hysteresis value added to the beam-specific measurement value of each indicated candidate cell is less than the threshold

[0205] -Event CLTM5: If the value obtained by subtracting the hysteresis value (optional, adding the beam-specific offset value) from the beam-specific measurements of the serving cell is greater than threshold 1, and the value obtained by adding the frequency-specific offset value, the cell-specific offset value, and the hysteresis value (optional, adding the beam-specific offset value) to the beam-specific measurements of each indicated candidate cell is less than 2.

[0206] Time to trigger: For each beam, if the measured value satisfies the entry condition given in the event during this time and does not satisfy the leaving condition, the event may be satisfied.

[0207] In addition, according to one embodiment, there may be instructions regarding the quantity used for measurement and evaluation. For example, if settings for quantities such as RSRQ, RSRP, RSSI, etc. are provided, the terminal should consider the quantity used for measurement and evaluation of each beam as indicated.

[0208] According to one embodiment, the parameter values ​​required for the entry and leaving conditions of each event, namely time to trigger, Hysteresis, threshold 1, threshold 2, frequency-specific offset, cell-specific offset, beam-specific offset, and event-specific offset values, may be transmitted to the terminal for each event, including MO or report configuration.

[0209] In addition, according to one embodiment of the present disclosure, the method of indicating condition information, i.e., an event, may be transmitted to the terminal by being included in opt 1. report Configuration, or indicated by being included in a separate field other than opt 2. report configuration.

[0210] Opt 1: Events are included in the report configuration and delivered to the terminal.

[0211] opt 1-1: A single report configuration may contain multiple events. In this case, for MOs or separately designated candidate cells associated with the report configuration, a specific event may be directed as a condition to a specific candidate cell, and another event may be directed as a condition to yet another specific candidate cell. That is, multiple events existing in a single report configuration may each be separately directed as conditions to different candidate cells. According to opt 1-1, an event must be associated with each candidate cell and directed to the terminal.

[0212] opt 1-2: A single report configuration may include one or multiple events, but these events are applied as conditions to only one of the MO or separately designated candidate cells. If multiple events are applied to a single candidate cell, it can be considered that the condition is satisfied only when all multiple events are satisfied simultaneously.

[0213] Opt 2: Events are delivered in a separate field outside the report configuration.

[0214] The network can separately transmit condition event information for each candidate cell to the terminal, along with CLTM configuration information, separate from MO or report configuration. In this case, the parameters required for each event can also be transmitted to the terminal along with the event.

[0215] [Example of conveying configuration information]

[0216] According to one embodiment of the present disclosure, various setting information is transmitted to a terminal depending on a combination of options for a candidate cell indication method, a measurement beam indication method, and a condition indication method, and the operation of the terminal may vary accordingly. Hereinafter, embodiments according to combinations of the aforementioned options are described. Of course, the following examples are not limited to the examples below, and all the aforementioned options can be combined without limitation.

[0217] FIG. 8 illustrates the operation according to a candidate cell indication method, a measurement beam indication method, and a condition indication method according to one embodiment of the present disclosure.

[0218] Figure 8 illustrates a case consisting of a combination of cell indication opt 2, beam indication opt 1-2 and opt 2, condition indication method opt 1-2.

[0219] According to one embodiment, measIds configured with different report configurations may be provided to the same MO 1 as conditions for each specific candidate cell. Additionally, a beam to be measured may be directed to the corresponding candidate cell. The beam information may be included in the candidate cell-specific configuration information of the CLTM and transmitted to the terminal. The terminal performs the measurement of MO 1, but each candidate cell may recognize, identify, and evaluate its own conditions according to the report configuration containing the condition information directed in the measId.

[0220] FIG. 9 illustrates the operation according to a candidate cell indication method, a measurement beam indication method, and a condition indication method according to one embodiment of the present disclosure.

[0221] Figure 9 illustrates a case consisting of a combination of cell indicator opt 2, beam indicator opt 1-2 and opt 2, condition indicator opt 1-1.

[0222] According to one embodiment, a measId configured with a single report configuration in a single MO1 may be provided as a condition to each candidate cell. A single report configuration may include event information associated with specific candidate cell information. Therefore, an event referred to in a single report configuration may be applied exclusively to different candidate cells. Additionally, a target beam for measurement may be indicated to the corresponding candidate cell. The beam information may be included in the candidate cell-specific configuration information of the CLTM and transmitted to the terminal.

[0223] The terminal performs the measurement of MO 1, but can recognize and evaluate the conditions for each candidate cell by following the cell-specific condition information specified in the report configuration of the measId specified as a condition.

[0224] FIG. 10 illustrates the operation according to a candidate cell indication method, a measurement beam indication method, and a condition indication method according to one embodiment of the present disclosure.

[0225] Figure 10 illustrates a case consisting of a combination of cell indicator opt 4, beam indicator opt 1-1 and opt 1-2, and condition indicator opt 1-2.

[0226] According to one embodiment, the network may be configured with different MOs on the same frequency and may indicate a CLTM candidate cell to each MO. Different report configurations are associated with each MO, and measIds configured by the association between the different report configurations and each MO may be indicated as conditions specific to the candidate cell indicated on the MO and transmitted to the terminal. The terminal may measure the candidate cell indicated to the MO constituting the measId and perform an evaluation of the event indicated within the report configuration constituting the measId on the corresponding candidate cell.

[0227] Additionally, according to one embodiment of the present disclosure, the network can specify and indicate a beam to be considered when measuring and evaluating in each candidate cell of each MO.

[0228] FIG. 11 illustrates the operation according to a candidate cell indication method, a measurement beam indication method, and a condition indication method according to one embodiment of the present disclosure.

[0229] Figure 11 illustrates a case consisting of a combination of cell indication opt 1, beam indication opt 1-1 / 1-2, and condition indication opt 1-2.

[0230] According to one embodiment of the present disclosure, a network may indicate all candidate cells associated with that frequency to a single MO (e.g., cell A, B). Additionally, the network may specify a beam to be considered during measurement and condition evaluation in each cell. A report configuration associated with the MO may be different for each candidate cell. Each report configuration may include event information as a condition to be considered in a specific candidate cell, and a measId formed by the MO and the report configuration may be given to the candidate cell as condition information for CLTM as the target of the event indicated in the report configuration. A terminal may look at the measId indicated for each candidate cell and evaluate the event within the associated report configuration based on the corresponding candidate cell.

[0231] FIG. 12 illustrates the operation according to a candidate cell indication method, a measurement beam indication method, and a condition indication method according to one embodiment of the present disclosure.

[0232] FIG. 12 illustrates a case consisting of a combination of cell indication opt 1, beam indication opt 1-1 / 1-2, and condition indication opt 1-1.

[0233] According to one embodiment of the present disclosure, the same MO may indicate all CLTM candidate cells within the corresponding frequency and may additionally include beam information to be considered when measuring and determining conditions in each cell. The MO may be associated with a single report configuration, and the report configuration may include multiple events representing conditions for each CLTM candidate cell of the MO to which it is associated. Each event is a determination target to be considered, and candidate cell information must be indicated. The measId composed of the MO and the report configuration may be provided as condition information for each candidate cell included in the MO.

[0234] The terminal receives measId information, recognizes candidate cells present in the MO, measures the beam of the cell, and can perform an evaluation of the satisfaction of the event associated with each cell.

[0235] FIG. 13 illustrates a procedure performed by a terminal when the CLTM-related setting information according to one embodiment of the present disclosure is given to the terminal.

[0236] FIG. 13 is a diagram of the work performed by the terminal when CLTM-related configuration information is given to the terminal.

[0237] According to one embodiment of the present disclosure, a terminal may receive measurement configuration information that includes CLTM-related condition information in an RRCReconfiguration message. Additionally, configuration information for the operation related to the CLTM may also be included in the RRCReconfiguration message.

[0238] According to one embodiment of the present disclosure, measurement configuration information may refer to the previously mentioned MO, report configuration, and measurement Id, and may be provided through previously proposed methods.

[0239] According to one embodiment of the present disclosure, configuration information for CLTM-related operations may include CLTM common configuration information and CLTM candidate cell-specific configuration information. The CLTM common configuration information may include information such as a reference setting used when setting a target cell, an ID list linked to candidate cells, etc., but is not limited to the above examples.

[0240] According to one embodiment of the present disclosure, a CLTM candidate cell-specific setting may include at least one of a target cell setting to be used in the candidate cell (which may be an RRCReconfiguration message), beam information that may be considered when measuring and evaluating conditions in the candidate cell (beam ID), and a list of measurement IDs as condition information to be considered for the candidate cell, but is not limited to the above examples.

[0241] When the terminal receives measurement configuration information containing CLTM-related condition information, it may start measuring a candidate cell and a beam in that cell according to the measurement configuration. It may also perform an evaluation of the satisfaction of events based on the beam. In the present disclosure, multiple events may represent conditions for a single candidate cell. That is, an evaluation may be performed when all multiple events are satisfied in order to perform CLTM on a specific candidate cell.

[0242] If the conditions for a specific candidate cell are satisfied, the terminal determines the candidate cell associated with the condition as the target cell and can determine the beam of the candidate cell corresponding to the satisfied condition as the target beam to be used in the target cell. Then, the terminal applies the settings in the target cell and can transmit a complete message using the target beam. If random access must be performed before transmitting the complete message, a preamble is transmitted to the target beam, and the reception of msg 2 and / or transmission of msg 3 can be performed using that beam. In this case, a measurement report indicating that the CLTM conditions have been satisfied may not be transmitted to the source cell. If the complete message is successfully delivered to the target cell, the Distributed Unit (DU) operating the target cell can transmit a signal containing information that the CLTM was successfully performed to its Central Unit (CU).

[0243] The above-described embodiments described a method of signaling existing L3 information including parameters necessary for CLTM. In other embodiments below, CLTM configuration information can be transmitted to the terminal independently of L3 information.

[0244] At this time, the terminal may be instructed to configure the CLTM, and as condition-related information, it may have multiple candidate cell information to be measured (separate IDs and PCI and / or ARFCN (Absolute radio-frequency channel number) information assigned thereto), information on the beam to be measured for each cell (SSB index or CSI RS resource or resource set configuration information and an ID indicating one of them), condition information including the event to be applied for each candidate cell and parameter information used in the event. Of course, it is not limited to the above examples.

[0245] Additionally, for each candidate cell, information may be included, such as the ID assigned to the CLTM setting or CLTM candidate cell, the setting to be applied in the target cell, the reference configuration.

[0246] A terminal that has received the aforementioned information can identify a measurement target, check the measurement of the target and the condition information assigned to the target, and perform a condition evaluation. Subsequently, the operation may be identical to an L3-based configuration operation.

[0247] The present disclosure also provides embodiments for L1-based CLTMs that are not L3-based.

[0248] Existing LTMs sent measurement results based on L1 common CSI information, but the L1-based CLTM of the present disclosure can also take this into consideration and transmit information specifying specific candidate cells and specific beams of those cells to a terminal by combining one common CSI information with a specific CLTM event X (or additionally a plurality of CLTM events).

[0249] According to one embodiment of the present disclosure, when one common CSI information and a specific CLTM event X (or additionally a plurality of CLTM events) are linked and transmitted to a terminal, the terminal may assume that the condition is satisfied when a beam satisfying a given event is generated / measured / discovered without distinguishing between separate candidate cells. At that time, at the moment a beam satisfying the event is generated, the cell having the beam can be determined and identified as the target cell, and the beam satisfying the event can be determined and identified as the target beam in the target cell.

[0250] According to one embodiment, as a method for providing a configuration signal, an indicator indicating that it is a CLTM event type and an indicator indicating the type of event can be transmitted to a terminal in a CSI report configuration associated with L1 common CSI info.

[0251] A terminal that receives a configuration signal can start measurements according to common CSI information. In addition, it can simultaneously perform an evaluation of satisfaction / dissatisfaction regarding events for CLTM present in the CSI report configuration.

[0252] In addition, according to one embodiment of the present disclosure, different operations may be required for single event / multiple event regarding the setting and satisfaction of an Event.

[0253] [In the case of a single event]

[0254] If there are multiple beams that simultaneously satisfy the given conditions, the terminal may determine the target cell and the target beam by the following method. They may be determined based on at least one of the following methods.

[0255] - Can be determined based on terminal implementation

[0256] - If multiple beams belong to different candidate cells,

[0257] The beam with the best signal strength among the beams satisfying the conditions becomes the target beam, and the cell possessing that beam can become the target cell.

[0258] Alternatively, among the cells possessing beams that satisfy the conditions, the cell with the largest number of beams satisfying the conditions becomes the target cell, and the beam with the best signal strength in that cell can become the target beam.

[0259] --Alternatively, among the cells possessing beams that satisfy the conditions, the cell with the best signal strength becomes the target cell, and the beam with the best signal strength from that cell can become the target beam.

[0260] In the aforementioned case, the CLTM event type can consider all types of events proposed in the previous L3 case, and the condition evaluation factors required for each proposed case in L3 can also be applied in the same way in the L1 case. The network can transmit the factors required for each event to the terminal by linking them to the CLTM event in the CSI report configuration.

[0261] [In the case of multiple events]

[0262] If there are multiple CLTM events associated with the relevant common CSI resource, the condition may be considered satisfied if all given events are satisfied or if at least one of the given events is satisfied. If at least one is satisfied, the target cell and beam can be determined in the same way as in the case of a single event above. If all given events must be satisfied, the cell satisfying each event may be the same, and in this case, the target beam in the target cell can be determined as at least one of the following.

[0263] - Selected for terminal implementation

[0264] - Select the beam with the best signal strength from the target cell

[0265] However, in cases where all events must be satisfied, the cells satisfying each event may differ. For example, if CLTM event 3 and CLTM event 5 are configured for a single common CSI resource, beams satisfying both events may occur, but the cells of each beam may differ. In such cases, the selection of the target cell can be determined as follows. Of course, it is not limited to the examples below.

[0266] - A target cell can be selected from among the cells that own a beam satisfying each event through terminal implementation, and in the selected target cell, the beam satisfying the condition can also be a terminal implementation or a beam with the best signal strength among the beams.

[0267] - For each cell satisfying the event, select the cell with the best signal strength beam as the target cell, or

[0268] For each cell satisfying an event, a beam with a signal strength greater than a specific threshold or a cell with a large number of beams satisfying a given event can be selected as the target cell.

[0269] When a target cell is selected, the target beam from that cell can be the terminal implementation or the beam with the best signal strength.

[0270] According to one embodiment of the present disclosure, when a target beam and a target cell are determined, the terminal can perform CLTM by applying the settings of the corresponding target cell. Additionally, after performing, it can transmit an RA preamble through the target beam for communication with the target cell and / or receive a RAR (Random Access Response) and / or transmit an RRCReconfigurationComplete message.

[0271] FIG. 14 illustrates a procedure for determining a target cell and a target beam based on information received by a terminal according to one embodiment of the present disclosure to perform a CLTM operation.

[0272] According to one embodiment of the present disclosure, when a terminal receives a CLTM configuration, it can identify a candidate cell.

[0273] In addition, the terminal can identify the beam after identifying the candidate cell and apply an event depending on the performance of the measurement.

[0274] In other words, whether L3-based or L1-based, after receiving configuration information, the terminal identifies candidate cells and beams for measurement and evaluation, performs measurements based on the corresponding targets, and evaluates the satisfaction of associated conditions.

[0275] FIG. 15 illustrates a procedure for CLTM in a terminal and a network according to one embodiment of the present disclosure.

[0276] According to one embodiment of the present disclosure, the terminal maintains a connection mode with a serving base station (UE in RRC_CONNECTED). Through a pre-configured L3 RRM measurement setting, the terminal can report measurement results for surrounding cells in a configured frequency band to the base station (Measurement report).

[0277] Based on the measurement results, the base station can determine CLTM candidate cells (LTM candidate preparation) and instruct the terminal with the related condition information and CLTM configuration information (RRC reconfiguration (LTM candidate configuration including CLTM specific config in measConfig / RRC reconfiguration complete).

[0278] A terminal that receives the above information can start measuring the corresponding candidate cells and the beams of those cells according to the measurement target, and at the same time, start evaluating the given conditions (start measurement and condition evaluation on CLTM candidates).

[0279] If any of the given conditions are satisfied, the terminal can determine the target cell and target beam associated with the condition, perform a cell switch to the target cell using the target beam, and deliver a completion message. During this process, random access operations can be performed using the target beam (If any CLTM event is fulfilled, LTM execution to that candidate / Detach from source, apply target configuration / RACH procedure / LTM cell switch completion).

[0280] Methods according to the embodiments described in the claims or specification of the present invention may be implemented in the form of hardware, software, or a combination of hardware and software.

[0281] When implemented in software, a computer-readable storage medium may be provided for storing one or more programs (software modules). One or more programs stored in the computer-readable storage medium are configured for execution by one or more processors within an electronic device. One or more programs include instructions that cause the electronic device to execute methods according to embodiments described in the claims or specification of the present invention.

[0282] Such programs (software modules, software) may be stored in random access memory, non-volatile memory including flash memory, ROM (Read Only Memory), Electrically Erasable Programmable Read Only Memory (EEPROM), magnetic disc storage devices, Compact Disc-ROM (CD-ROM), Digital Versatile Discs (DVDs), or other forms of optical storage devices, magnetic cassettes. Alternatively, they may be stored in memory composed of some or all of these. Additionally, each constituent memory may include multiple units.

[0283] In addition, the above program may be stored on an attachable storage device that can be accessed via a communication network such as the Internet, Intranet, Local Area Network (LAN), Wide LAN (WLAN), or Storage Area Network (SAN), or a combination thereof. Such a storage device may be connected to a device performing an embodiment of the present invention through an external port. Additionally, a separate storage device on a communication network may be connected to a device performing an embodiment of the present invention.

[0284] In the specific embodiments of the present invention described above, the components included in the invention are expressed in a singular or plural form according to the specific embodiments presented. However, the singular or plural expression is selected to suit the situation presented for convenience of explanation, and the present invention is not limited to singular or plural components; even if a component is expressed in the plural form, it may be composed in the singular form, or even if a component is expressed in the singular form, it may be composed in the plural form.

[0285] Meanwhile, although specific embodiments have been described in the detailed description of the present invention, it is understood that various modifications are possible within the scope of the present invention. Therefore, the scope of the present invention should not be limited to the described embodiments, but should be defined by the claims set forth below as well as equivalents thereof.

Claims

1. A method performed by a terminal (user equipment) in a wireless communication system, wherein the method comprises: A step of receiving CLTM configuration information from a base station, the information including information regarding a measurement object for a conditional LTM (layer 1 / 2 triggered mobility) (CLTM) and information regarding a condition of said CLTM; A step of performing measurements on candidate cells and candidate beams based on information regarding the above-mentioned measurement targets; A step of identifying that the conditions of the indicated CLTM are satisfied based on the measurement results for the candidate cell and the candidate beam; and A method comprising the step of performing an LTM procedure or a CLTM cell switch procedure for the candidate cell based on the candidate beam.

2. In Paragraph 1, The above CLTM setting information includes at least one measurement ID (identification), and A method in which information regarding the measurement target and information regarding the conditions of the CLTM are included within at least one measurement ID.

3. In Paragraph 2, Information regarding the above measurement target includes information indicating the above candidate cell, and A method comprising information indicating the above candidate cell including information indicating a plurality of candidate cells corresponding to the measurement target or information indicating a single candidate cell.

4. In Paragraph 2, A method in which the above candidate cell is identified based on whether the at least one measurement ID includes a report configuration associated with the measurement target.

5. In Paragraph 1, A method in which the above candidate cell is indicated by a separate field different from the information regarding the measurement target.

6. In Paragraph 1, The above candidate beam is indicated in conjunction with the above candidate cell, and A method in which information for indicating the above candidate beam is linked to a cell ID for indicating the above candidate cell within information regarding the measurement target, or is indicated by being included in cell setting information corresponding to the above candidate cell.

7. In Paragraph 1, A method in which the above candidate beam includes all of at least one beam corresponding to the above candidate cell.

8. In Paragraph 1, A method in which information regarding the conditions of the above CLTM is included and indicated within a report configuration corresponding to the above candidate cell, or is included and indicated within a separate field different from the above report configuration.

9. In Paragraph 8, When information regarding the conditions of the above CLTM is included and indicated within the reporting settings corresponding to the above candidate cell: A method in which the above reporting setting includes a single CLTM event set as a condition of the above CLTM.

10. In Paragraph 8, When information regarding the conditions of the above CLTM is included and indicated within the reporting settings corresponding to the above candidate cell: The above reporting setting includes a plurality of CLTM events set as conditions of the above CLTM, and A method in which the plurality of CLTM events are set as CLTM conditions for each of the corresponding different plurality of candidate cells, or are set as CLTM conditions for any one of the different plurality of candidate cells.

11. Regarding the terminal (user equipment): At least one transceiver; At least one processor communicatively coupled to the above at least one transceiver; and It includes at least one memory that is communicationally coupled to the above at least one processor and stores instructions, and The above instructions are executed individually or in any combination by the above at least one processor, so that the terminal: Receive CLTM configuration information from a base station, including information regarding a measurement object for a conditional LTM (layer 1 / 2 triggered mobility) (CLTM) and information regarding a condition of said CLTM, and Based on the information regarding the above measurement targets, measurements are performed on candidate cells and candidate beams, and Identifying that the conditions of the indicated CLTM are satisfied based on the measurement results for the above candidate cell and the above candidate beam, and A terminal that performs an LTM procedure or a CLTM cell switch procedure for the candidate cell based on the candidate beam.

12. In Paragraph 11, The above CLTM setting information includes at least one measurement ID (identification), and A terminal in which information regarding the measurement target and information regarding the conditions of the CLTM are included within the at least one measurement ID.

13. In Paragraph 12, Information regarding the above measurement target includes information indicating the above candidate cell, and A terminal in which information indicating the above candidate cell includes information indicating a plurality of candidate cells corresponding to the measurement target or information indicating a single candidate cell.

14. In Paragraph 12, The above candidate cell is a terminal identified based on whether the at least one measurement ID includes a report configuration associated with the measurement target.

15. In Paragraph 11, The above candidate cell is a terminal indicated by a separate field different from the information regarding the measurement target.

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