Method and device for rapid secondary cell activation in next generation mobile communication system

Abstract

The present disclosure relates to a 5G or 6G communication system for supporting higher data transmission rates beyond a 4G communication system such as LTE. Disclosed are a method and device capable of rapidly activating a secondary cell for communication of a terminal.

Description

Method and device for rapid secondary cell activation in next-generation mobile communication systems

[0001] The present disclosure relates to the operation of a terminal in a mobile communication system. More specifically, the present disclosure relates to a technique for rapidly activating a secondary cell for terminal communication.

[0002] Looking back at the evolution of wireless communication over successive generations, technologies have primarily been developed for human-facing services such as voice, multimedia, and data. With the commercialization of 5G (5th-generation) communication systems, an explosive increase in connected devices is expected to be connected to communication networks. Examples of networked objects include vehicles, robots, drones, home appliances, displays, smart sensors installed in various infrastructures, construction equipment, and factory equipment. Mobile devices are also expected to evolve into diverse form factors, such as augmented reality glasses, virtual reality headsets, and holographic devices. In the 6th-generation (6G) era, efforts are being made to develop improved 6G communication systems to connect hundreds of billions of devices and objects and provide diverse services. For this reason, 6G communication systems are often referred to as "Beyond 5G" systems.

[0003] The 6G communication system, expected to be realized around 2030, will have a maximum transmission speed of terabytes per second (i.e., 1,000 gigabits per second) and a wireless latency of 100 microseconds (μsec). In other words, compared to 5G, the transmission speed in a 6G communication system will be 50 times faster, while the wireless latency will be reduced to one-tenth.

[0004] To achieve these high data rates and ultra-low latency, 6G communication systems are being considered for implementation in the terahertz band (e.g., from 95 gigahertz (GHz) to 3 terahertz (THz)). Compared to the millimeter wave (mmWave) band introduced in 5G, the terahertz band is expected to experience more severe path loss and atmospheric absorption, making it more crucial to ensure signal reach, or coverage, in this band. Key technologies to ensure coverage include radio frequency (RF) components, antennas, new waveforms that offer better coverage than orthogonal frequency division multiplexing (OFDM), beamforming, and multiple antenna transmission technologies such as massive multiple-input and multiple-output (MIMO), full-dimensional MIMO (FD-MIMO), array antennas, and large-scale antennas. In addition, new technologies such as metamaterial-based lenses and antennas, high-dimensional spatial multiplexing using orbital angular momentum (OAM), and reconfigurable intelligent surfaces (RIS) are being discussed to improve the coverage of terahertz band signals.

[0005] In addition, in order to improve frequency efficiency and system network, 6G communication systems are developing full duplex technology that utilizes the same frequency resources at the same time for uplink and downlink; network technology that integrates satellites and high-altitude platform stations (HAPS); network structure innovation technology that supports mobile base stations and enables optimization and automation of network operation; dynamic spectrum sharing technology through collision avoidance based on spectrum usage prediction; AI-based communication technology that utilizes artificial intelligence (AI) from the design stage and internalizes end-to-end AI support functions to realize system optimization; and next-generation distributed computing technology that realizes services with complexity that exceeds the limits of terminal computing capabilities by utilizing ultra-high-performance communication and computing resources (mobile edge computing (MEC), cloud, etc.). In addition, efforts are being made to further strengthen connectivity between devices, further optimize networks, promote softwareization of network entities, and increase the openness of wireless communications through the design of new protocols to be used in 6G communication systems, the implementation of hardware-based security environments, the development of mechanisms for the safe use of data, and the development of technologies for maintaining privacy.

[0006] Research and development of these 6G communication systems are expected to enable a new level of hyper-connected experience through the hyper-connectivity of 6G communication systems, which encompass not only connections between things but also connections between people and things. Specifically, 6G communication systems are expected to enable services such as truly immersive extended reality (XR), high-fidelity mobile holograms, and digital replicas. Furthermore, services such as remote surgery, industrial automation, and emergency response, which are provided through 6G communication systems through enhanced security and reliability, will be applied in diverse fields such as industry, medicine, automobiles, and home appliances.

[0007] As described above, the advancement of mobile communication systems has enabled the provision of a variety of services, necessitating measures to effectively deliver these services. For example, when configuring a secondary cell (SCell) for a terminal, the network can consider the role of each cell in each frequency band and, based on the frequency band characteristics of the cell in the FR2 or FR3 band, select the optimal beam for the terminal within that cell.

[0008] As described above, when the network performs optimal beam configuration for a terminal, the beam configuration operation can only be performed after SCell addition for the terminal. However, if optimal beam configuration for the cell is performed after SCell addition, a separate time is required for the beam configuration operation.

[0009] Accordingly, one object of the present disclosure is to provide a method and device capable of reducing the time required for additional SCell-related beam configuration for a terminal.

[0010] In order to solve the above problem, according to an example of the present disclosure, in a wireless communication system, a method of a terminal includes the steps of: receiving, from a base station, a radio resource control (RRC) message for adding secondary cells (SCells) to the terminal, wherein the RRC message includes a measurement configuration for each of at least one SCell among the SCells that is set to an inactive state; performing measurement on the at least one SCell based on the measurement configuration; transmitting, to the base station, a measurement report for the measurement; and receiving, from the base station, a signal indicating activation of an SCell among the at least one SCell, wherein the measurement configuration includes SCell identification information and measurement resource information mapped to the SCell identification information, and the measurement resource information may include information indicating a measurement target SSB among SSBs transmitted from a corresponding SCell.

[0011] In addition, in a method of a base station in a wireless communication system according to an example of the present disclosure, the method includes: transmitting, to a terminal, a radio resource control (RRC) message for adding secondary cells (SCells) to the terminal, wherein the RRC message includes a measurement configuration for each of at least one SCell among the SCells that is set to an inactive state; receiving, from the terminal, a measurement report for the at least one SCell based on the measurement configuration; and transmitting, to the terminal, a signal indicating activation of an SCell among the at least one SCell, wherein the measurement configuration includes SCell identification information and measurement resource information mapped to the SCell identification information, and the measurement resource information may include information indicating a measurement target SSB among SSBs transmitted from a corresponding SCell.

[0012] In addition, in a wireless communication system according to an example of the present disclosure, a terminal includes a transceiver; and a control unit configured to control the transceiver to receive, from a base station, a radio resource control (RRC) message for adding secondary cells (SCells) to the terminal, wherein the RRC message includes a measurement configuration for each of at least one SCell set to an inactive state among the SCells, perform measurement on the at least one SCell based on the measurement configuration, and control the transceiver to transmit a measurement report for the measurement to the base station, and control the transceiver to receive, from the base station, a signal indicating activation of an SCell among the at least one SCell, wherein the measurement configuration includes SCell identification information and measurement resource information mapped to the SCell identification information, and the measurement resource information may include information indicating a measurement target SSB among SSBs transmitted from a corresponding SCell.

[0013] In addition, in a wireless communication system according to an example of the present disclosure, a base station includes a transceiver; and a control unit configured to control the transceiver to transmit a radio resource control (RRC) message to add secondary cells (SCells) to the terminal, the RRC message including a measurement configuration for each of at least one SCell set to an inactive state among the SCells, to receive, from the terminal, a measurement report for the at least one SCell based on the measurement configuration, and to control the transceiver to transmit, to the terminal, a signal indicating activation of an SCell among the at least one SCell, wherein the measurement configuration includes SCell identification information and measurement resource information mapped to the SCell identification information, and the measurement resource information may include information indicating a measurement target SSB among SSBs transmitted from a corresponding SCell.

[0014] According to one example of the present disclosure, the time required for SCell activation of a terminal can be reduced, thereby having the effect of accelerating the start time of high-speed data transmission.

[0015] FIG. 1 is a diagram illustrating the structure of an LTE system according to an example of the present disclosure.

[0016] FIG. 2 is a diagram showing a wireless protocol structure of an LTE system according to an example of the present disclosure.

[0017] FIG. 3 is a diagram illustrating the structure of a next-generation mobile communication system according to an example of the present disclosure.

[0018] FIG. 4 is a diagram showing a wireless protocol structure of a next-generation mobile communication system according to an example of the present disclosure.

[0019] FIG. 5 is a block diagram illustrating the internal structure of a terminal according to an example of the present disclosure.

[0020] FIG. 6 is a block diagram showing the configuration of an NR base station according to an example of the present disclosure.

[0021] FIG. 7 is a diagram illustrating the arrangement of cells by frequency band according to an example of the present disclosure.

[0022] FIG. 8 is a diagram for explaining the possibility of the role of a cell and the role of a CA according to an NES method according to an example of the present disclosure.

[0023] FIG. 9 is a diagram for explaining a fast SCell activation operation based on two sub states according to an example of the present invention.

[0024] FIG. 10 is a diagram illustrating a fast SCell activation operation based on three sub states according to an example of the present disclosure.

[0025] FIG. 11a is a diagram for explaining CSI-RS configuration when two sub states are applied according to an example of the present disclosure.

[0026] FIG. 11b is a diagram for explaining CSI-RS configuration when two sub states are applied according to an example of the present disclosure.

[0027] FIG. 12a is a diagram for explaining CSI-RS configuration when three sub states are applied according to an example of the present disclosure.

[0028] FIG. 12b is a diagram for explaining CSI-RS configuration when three sub states are applied according to an example of the present disclosure.

[0029] FIG. 12c is a diagram for explaining CSI-RS configuration when three sub states are applied according to an example of the present disclosure.

[0030] The operating principles of the present invention will be described in detail below with reference to the attached drawings. In the following description of the present invention, detailed descriptions of known functions or components will be omitted if they are deemed to unnecessarily obscure the gist of the invention. Furthermore, the terms described below are defined based on their functions in the present invention and may vary depending on the intentions or practices of the user or operator. Therefore, their definitions should be based on the overall content of this specification.

[0031] The 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, and terms referring to various identification information are provided for convenience of explanation. Therefore, the present invention is not limited to the terms described below, and other terms referring to objects with equivalent technical meanings may be used.

[0032] Hereinafter, the base station is an entity that performs resource allocation of the terminal, and may be at least one of a gNode B, an eNode B, a Node B, a BS (Base Station), a wireless access unit, a base station controller, or a node on a network. The terminal may include a UE (User Equipment), an MS (Mobile Station), a cellular phone, a smartphone, a computer, or a multimedia system capable of performing a communication function. In the present disclosure, downlink (DL) refers to a wireless transmission path of a signal transmitted from a base station to a terminal, and uplink (UL) refers to a wireless transmission path of a signal transmitted from a terminal to a base station. In addition, although the LTE or LTE-A system may be described below as an example, the embodiments of the present disclosure may also be applied to other communication systems having similar technical backgrounds or channel types. For example, the 5th generation mobile communication technology (5G, new radio, NR) developed after LTE-A may be included in a system to which the embodiments of the present disclosure may be applied, and 5G below may also 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, as determined by a person skilled in the art, without significantly departing from the scope of the present disclosure. It will be appreciated that each block of the processing flow diagrams and combinations of the flow diagrams can be executed by computer program instructions.

[0033] These computer program instructions may be installed in a processor of a general-purpose computer, a special-purpose computer, or other programmable data processing apparatus, so that the instructions executed by the processor of the computer or other programmable data processing apparatus create means for performing the functions described in the flowchart block(s). These computer program instructions may also be stored in a computer-available or computer-readable memory that can be directed to a computer or other programmable data processing apparatus to implement functions in a particular manner, so that the instructions stored in the computer-available or computer-readable memory can produce an article of manufacture that includes instruction means for performing the functions described in the flowchart block(s). The computer program instructions may also be installed on a computer or other programmable data processing apparatus, so that a series of operational steps are performed on the computer or other programmable data processing apparatus to create a computer-implemented process, so that the instructions executing on the computer or other programmable data processing apparatus can provide steps for performing the functions described in the flowchart block(s).

[0034] Additionally, each block may represent a module, segment, or portion of code that contains one or more executable instructions for executing a specific logical function(s). It should also be noted that in some alternative implementation examples, the functions mentioned in the blocks may occur out of order. For example, two blocks shown in succession may in fact be executed substantially simultaneously, or the blocks may sometimes be executed in reverse order depending on the corresponding function. In this case, the term '~unit' used in the present embodiment means software or a hardware component such as an FPGA (Field Programmable Gate Array) or an ASIC (Application Specific Integrated Circuit), and the '~unit' may perform certain roles. However, the '~unit' is not limited to software or hardware. The '~unit' may be configured to be on an addressable storage medium and may be configured to execute one or more processors. Thus, as an example, the '~ unit' includes components such as software components, object-oriented software components, class components, and task components, processes, functions, attributes, procedures, subroutines, segments of program code, drivers, firmware, microcode, circuits, data, databases, data structures, tables, arrays, and variables. The functionality provided within the components and '~ units' may be combined into a smaller number of components and '~ units' or further separated into additional components and '~ units'. In addition, the components and '~ units' may be implemented to reproduce one or more CPUs within a device or a secure multimedia card. Also, in an embodiment, the '~ unit' may include one or more processors.

[0035] For convenience of explanation, the present invention uses terms and names defined in the 5GS and NR standards, which are standards defined by the 3rd Generation Partnership Project (3GPP) among the existing communication standards. However, the present invention is not limited to the above terms and names and can be equally applied to wireless communication networks that follow other standards. For example, the present invention can be applied to the 3GPP 5GS / NR (5th generation mobile communication standard).

[0036] FIG. 1 is a diagram illustrating the structure of an LTE system according to an example of the present disclosure.

[0037] Referring to FIG. 1, as illustrated, a wireless access network of an LTE (long term evolution) system may be composed of next-generation base stations (Evolved Node Bs, hereinafter referred to as ENBs, Node Bs or base stations) (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 equipment (UE or terminal) (1-35) may access an external network through the ENBs (1-05 to 1-20) and the S-GW (1-30).

[0038] In Fig. 1, ENBs (1-05 to 1-20) may correspond to existing Node Bs of a UMTS (universal mobile telecommunication system) system. ENBs are connected to UEs (1-35) via a wireless channel and may perform more complex roles than 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 that collects status information such as the buffer status, available transmission power status, and channel status of UEs and performs scheduling is required, and ENBs (1-05 to 1-20) may be responsible for this. One ENB can typically control multiple cells. For example, to achieve a transmission rate of 100 Mbps, an LTE system may use, for example, Orthogonal Frequency Division Multiplexing (OFDM) as a wireless access technology in a 20 MHz bandwidth. Additionally, an adaptive modulation and coding (AMC) method can be applied, which determines the modulation scheme and channel coding rate according to the channel status of the terminal.

[0039] S-GW (1-30) is a device that provides a data bearer and can create or remove a data bearer under the control of MME (1-25).

[0040] MME (1-25) is a device that is responsible for various control functions as well as mobility management functions for terminals and can be connected to multiple base stations.

[0041] FIG. 2 is a diagram illustrating a wireless protocol structure of an LTE system according to an example of the present disclosure.

[0042] Referring to Figure 2, the wireless protocol of the LTE system may be composed of Packet Data Convergence Protocol (PDCP) (2-05, 2-40), Radio Link Control (RLC) (2-10, 2-35), and Medium Access Control (MAC) (2-15, 2-30) in the terminal and ENB, respectively. PDCP may be responsible for operations such as IP (internet protocol) header compression / decompression. The main functions of PDCP can be summarized as follows.

[0043] - Header compression and decompression (ROHC only)

[0044] - User data transfer function

[0045] - In-sequence delivery of upper layer PDUs at PDCP re-establishment procedure for RLC AM

[0046] - Order reordering function (For split bearers in DC (only support for RLC AM): PDCP PDU routing for transmission and PDCP PDU reordering for reception)

[0047] - Duplicate detection function (Duplicate detection of lower layer SDUs at PDCP re-establishment procedure for RLC AM)

[0048] - 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)

[0049] - Encryption and decryption functions (Ciphering and deciphering)

[0050] - Timer-based SDU discard in uplink.

[0051] Radio Link Control (RLC) (2-10, 2-35) can perform ARQ operations, etc. by reconfiguring PDCP packet data units (PDUs) to an appropriate size. The main functions of RLC can be summarized as follows.

[0052] - Data transfer function (Transfer of upper layer PDUs)

[0053] - ARQ function (Error Correction through ARQ (only for AM data transfer))

[0054] - Concatenation, segmentation and reassembly of RLC SDUs (only for UM and AM data transfer)

[0055] - Re-segmentation of RLC data PDUs (only for AM data transfer)

[0056] - Reordering of RLC data PDUs (only for UM and AM data transfer)

[0057] - Duplicate detection (only for UM and AM data transfer)

[0058] - Error detection function (Protocol error detection (only for AM data transfer))

[0059] - RLC SDU discard function (RLC SDU discard (only for UM and AM data transfer))

[0060] - RLC re-establishment function

[0061] MAC (2-15, 2-30) is connected to multiple RLC layer devices configured in a single terminal, and can perform the operation of multiplexing RLC PDUs (protocol data units) into MAC PDUs and demultiplexing RLC PDUs from MAC PDUs. The main functions of MAC can be summarized as follows.

[0062] - Mapping function (Mapping between logical channels and transport channels)

[0063] - 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)

[0064] - Scheduling information reporting function

[0065] - HARQ function (Error correction through HARQ)

[0066] - Priority handling between logical channels of one UE

[0067] - Priority handling between UEs by means of dynamic scheduling

[0068] - MBMS service identification function

[0069] - Transport format selection function

[0070] - Padding function

[0071] The physical layer (2-20, 2-25) can perform the operation of channel coding and modulating upper layer data, converting it into OFDM symbols and transmitting it through a wireless channel, or demodulating and channel decoding OFDM symbols received through a wireless channel and transmitting them to a higher layer.

[0072] FIG. 3 is a diagram illustrating the structure of a next-generation mobile communication system according to an example of the present disclosure.

[0073] Referring to FIG. 3, a wireless access network of a next-generation mobile communication system (hereinafter referred to as NR or 5g) may be composed of a next-generation base station (New Radio Node B, hereinafter referred to as NR gNB or NR base station) (3-10) and a next-generation radio core network (New Radio Core Network, NR CN) (3-05). A next-generation radio user equipment (New Radio User Equipment, NR UE or terminal) (3-15) may access an external network through the NR gNB (3-10) and the NR CN (3-05).

[0074] In Fig. 3, the NR gNB (3-10) may correspond to the eNB (Evolved Node B) of the existing LTE system. The NR gNB is connected to the NR UE (3-15) via a wireless channel and can provide superior services than the existing Node B. In the next-generation mobile communication system, all user traffic can be serviced through a shared channel. Therefore, a device that collects status information such as the buffer status of the UEs, the available transmission power status, and the channel status and performs scheduling is required, and the NR NB (3-10) may be responsible for the scheduling. One NR gNB may control multiple cells. In the next-generation mobile communication system, in order to implement ultra-high-speed data transmission compared to the general LTE, a bandwidth exceeding the general maximum bandwidth may be applied. In addition, beamforming technology may be additionally grafted using Orthogonal Frequency Division Multiplexing (OFDM) as a wireless access technology. Additionally, an adaptive modulation and coding (AMC) method that determines a modulation scheme and channel coding rate according to the channel status of the terminal may be applied.

[0075] The NR CN (3-05) can perform functions such as mobility support, bearer setup, and QoS (quality of service) setup. The NR CN is a device that handles not only mobility management for terminals but also various control functions and can be connected to multiple base stations. Furthermore, the next-generation mobile communication system can also be interoperable with the LTE system, and the NR CN can be connected to the MME (3-25) via a network interface. The MME can be connected to an eNB (3-30), which is an LTE base station.

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

[0077] Referring to FIG. 4, the wireless protocol of the next-generation mobile communication system consists of NR 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) in the terminal and NR base station, respectively.

[0078] Key features of NR SDAP (4-01, 4-45) may include some of the following:

[0079] - Transfer of user plane data

[0080] - Mapping function between QoS flow and data bearer for both DL and UL

[0081] - QoS flow ID marking function for uplink and downlink (marking QoS flow ID in both DL and UL packets)

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

[0083] For an SDAP layer device, a terminal can be configured by a Radio Resource Control (RRC) message for each PDCP layer device, each bearer, or each logical channel to use the header of the SDAP layer device or to use the function of the SDAP layer device. When the SDAP header is configured, the terminal can instruct the terminal to update or reset the mapping information for the QoS flow and data bearer of the uplink and downlink by using a 1-bit indicator for reflecting the Non-Access Stratum (NAS) Quality of Service (QoS) in the SDAP header (NAS reflective QoS) and a 1-bit indicator for reflecting the Access Stratum (AS) QoS in the SDAP header. The SDAP header can include QoS flow ID information indicating QoS. The QoS information can be used as data processing priority, scheduling information, etc. to support a smooth service.

[0084] The main functions of NR PDCP (4-05, 4-40) may include some of the following functions:

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

[0086] - User data transfer function

[0087] - In-sequence delivery of upper layer PDUs

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

[0089] - PDCP PDU reordering for reception

[0090] - Duplicate detection of lower layer SDUs

[0091] - Retransmission function (Retransmission of PDCP SDUs)

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

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

[0094] In the above, the reordering function of the NR PDCP device may refer to a function of reordering PDCP PDUs received from a lower layer in order based on a PDCP SN (sequence number). The reordering function of the NR PDCP device may include a function of transmitting data to an upper layer in the reordered order, or a function of transmitting data directly without considering the order, a function of recording lost PDCP PDUs by reordering the order, a function of reporting a status of lost PDCP PDUs to the transmitting side, and a function of requesting retransmission of lost PDCP PDUs.

[0095] The main functions of NR RLC(4-10, 4-35) may include some of the following functions:

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

[0097] - 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 of RLC SDUs

[0101] - Re-segmentation of RLC data PDUs

[0102] - Reordering of RLC data PDUs

[0103] - Duplicate detection function

[0104] - Protocol error detection

[0105] - RLC SDU discard function

[0106] - RLC re-establishment function

[0107] In the above, the in-sequence delivery function of the NR RLC device may refer to the function of sequentially delivering RLC SDUs received from the lower layer to the upper layer. If a single RLC SDU is originally received divided into multiple RLC SDUs, the in-sequence delivery function of the NR RLC device may include the function of reassembling and delivering them.

[0108] The in-sequence delivery function of the NR RLC device may include a function to reorder received RLC PDUs based on the RLC SN (sequence number) or PDCP SN (sequence number), a function to record lost RLC PDUs by reordering them, a function to report status of lost RLC PDUs to the transmitter, and a function to request retransmission of lost RLC PDUs.

[0109] The in-sequence delivery function of the NR RLC device may include a function to sequentially deliver only the RLC SDUs up to the lost RLC SDU to the upper layer when there is a lost RLC SDU.

[0110] The in-sequence delivery function of the NR RLC device may include a function to deliver to the upper layer in sequence all RLC SDUs received before a predetermined timer starts if there are lost RLC SDUs and a predetermined timer has expired.

[0111] The in-sequence delivery function of the NR RLC device may include a function to deliver all RLC SDUs received so far to the upper layer in order if a predetermined timer has expired, even if there are lost RLC SDUs.

[0112] An NR RLC device can process RLC PDUs in the order they are received and deliver them to an NR PDCP device, regardless of the order of the sequence number (out-of-sequence delivery).

[0113] When an NR RLC device receives a segment, it can receive segments that are stored in a buffer or will be received later, reconstruct them into a complete RLC PDU, and then transmit them to the NR PDCP device.

[0114] The NR RLC layer may not include concatenation functionality, and the functionality may be performed by the NR MAC layer or replaced by the multiplexing functionality of the NR MAC layer.

[0115] In the above, the out-of-sequence delivery function of the NR RLC device may refer to the function of directly delivering RLC SDUs received from a lower layer to an upper layer regardless of the order. The out-of-sequence delivery function of the NR RLC device may include the function of reassembling and delivering the RLC SDUs when an original RLC SDU is received fragmented into multiple RLC SDUs. The out-of-sequence delivery function of the NR RLC device may include the function of storing and arranging the RLC SN or PDCP SN of the received RLC PDUs to record the lost RLC PDUs.

[0116] NR MAC (4-15, 4-30) can be connected to multiple NR RLC layer devices configured in one terminal, and the main functions of NR MAC can include some of the following functions.

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

[0118] - 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 function

[0126] The NR PHY layer (4-20, 4-25) can perform operations such as channel coding and modulating upper layer data, converting it into OFDM symbols and transmitting it through a wireless channel, or demodulating and channel decoding OFDM symbols received through a wireless channel and transmitting them to a higher layer.

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

[0128] Referring to FIG. 5, a terminal according to an example of the present disclosure includes 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).

[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) up-converts the baseband signal provided from the baseband processing unit (5-20) into an RF band signal and transmits it through an antenna, and down-converts the RF band signal received through the 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 digital to analog convertor (DAC), an analog to digital convertor (ADC), etc. In the drawing, only one antenna is shown, but the terminal may be equipped with multiple antennas. In addition, the RF processing unit (5-10) may include multiple RF chains. Furthermore, the RF processing unit (5-10) may perform beamforming. For the above beamforming, the RF processing unit (5-10) can adjust the phase and size of each signal transmitted and received through multiple antennas or antenna elements. In addition, the RF processing unit can perform MIMO and receive multiple layers when performing the MIMO operation.

[0130] The baseband processing unit (5-20) above performs a conversion function between a baseband signal and a bit stream according to the physical layer specifications of the system. For example, when transmitting data, the baseband processing unit (5-20) generates complex symbols by encoding and modulating a transmission bit stream. In addition, when receiving data, the baseband processing unit (5-20) restores the reception bit stream by demodulating and decoding the baseband signal provided from the RF processing unit (5-10). For example, in the case of following the OFDM (orthogonal frequency division multiplexing) method, when transmitting data, the baseband processing unit (5-20) generates complex symbols by encoding and modulating a transmission bit stream, maps the complex symbols to subcarriers, and then configures OFDM symbols through an inverse fast Fourier transform (IFFT) operation and a cyclic prefix (CP) insertion. In addition, when receiving data, the baseband processing unit (5-20) divides the baseband signal provided from the RF processing unit (5-10) into OFDM symbol units, restores signals mapped to subcarriers through FFT (fast Fourier transform), and then restores the received bit string 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 transmitter, a receiver, a transceiver, 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. In addition, 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, the different wireless access technologies may include wireless LAN (e.g., IEEE 802.11), a cellular network (e.g., LTE), etc. Additionally, the different frequency bands may include a super high frequency (SHF) (e.g., 2.NRHz, NRhz) band and a millimeter wave (mm wave) (e.g., 60GHz) band.

[0132] The storage unit (5-30) stores 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 access node that performs wireless communication using a second wireless access technology. In addition, the storage unit (5-30) provides the stored data at the request of the control unit (5-40).

[0133] The above control unit (5-40) controls the overall operations of the terminal. For example, the control unit (5-40) transmits and receives signals through the baseband processing unit (5-20) and the RF processing unit (5-10). In addition, the control unit (5-40) records and reads data in the storage unit (5-30). For this purpose, 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 application programs.

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

[0135] Referring to FIG. 6, a base station according to an example of the present disclosure 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).

[0136] The RF processing unit (6-10) performs functions for transmitting and receiving signals through a wireless channel, such as signal band conversion and amplification. The RF processing unit (6-10) up-converts the baseband signal provided from the baseband processing unit (6-20) into an RF band signal and transmits it through an antenna, and down-converts the RF band signal received through the antenna into a baseband signal. For example, the RF processing unit (6-10) may include a transmission filter, a reception filter, an amplifier, a mixer, an oscillator, a DAC, an ADC, etc. In the drawing, only one antenna is shown, but the first access node may have multiple antennas. In addition, the RF processing unit (6-10) may include multiple RF chains. Furthermore, the RF processing unit (6-10) may perform beamforming. For the 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 above RF processing unit can perform a downlink MIMO operation by transmitting one or more layers.

[0137] The baseband processing unit (6-20) above performs a conversion function between a baseband signal and a bit stream according to the physical layer specifications of the first wireless access technology. For example, when transmitting data, the baseband processing unit (6-20) generates complex symbols by encoding and modulating a transmission bit stream. In addition, when receiving data, the baseband processing unit (6-20) restores the reception bit stream by demodulating and decoding the baseband signal provided from the RF processing unit (6-10). For example, in the case of OFDM, when transmitting data, the baseband processing unit (6-20) generates complex symbols by encoding and modulating a transmission bit stream, maps the complex symbols to subcarriers, and then configures OFDM symbols through IFFT operation and CP insertion. In addition, when receiving data, the baseband processing unit (6-20) divides the baseband signal provided from the RF processing unit (6-10) into OFDM symbol units, restores the signals mapped to subcarriers through FFT operation, and then restores the received bit string 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 transmitter, a receiver, a transceiver, a communication unit, or a wireless communication unit.

[0138] The above backhaul communication unit (6-30) provides an interface for communicating with other nodes within the network. The above backhaul communication unit (6-30) converts a bit string transmitted from the main base station to other nodes, such as auxiliary base stations and core networks, into a physical signal, and converts a physical signal received from the other nodes into a bit string.

[0139] The storage unit (6-40) stores data such as basic programs, application programs, and configuration information for the operation of the main base station. In particular, the storage unit (6-40) can store information on bearers assigned to connected terminals, measurement results reported from connected terminals, and the like. In addition, the storage unit (6-40) can store information that serves as a judgment criterion for whether to provide or terminate multiple connections to a terminal. In addition, the storage unit (6-40) provides the stored data at the request of the control unit (6-50).

[0140] The control unit (6-50) controls 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). In addition, the control unit (6-50) records and reads data in the storage unit (6-40). For this purpose, the control unit (6-50) may include at least one processor.

[0141] Meanwhile, in 6G communication systems, the existing FR1 (sub-6GHz) band and the FR3 (7.125 GHz to 24.25 GHz) band can be considered as available frequency bands. Of course, the FR2 band used in NR (new radio) can also be considered as an available frequency band in 6G communication systems. Due to their frequency characteristics, these two bands, namely the FR1 and FR3 bands, must be used in combination to achieve optimal performance. More specifically, cells in the FR1 band can have relatively large coverage characteristics and provide more reliable connection characteristics due to their frequency characteristics and good radio wave penetration ratio. However, it is relatively difficult to secure wide bandwidth in the FR1 band. In contrast, cells in the FR3 band have low radio wave penetration ratio due to their frequency characteristics and, as a result, their coverage can be small and their cell areas can be discontinuous (i.e., coverage holes are frequent). To address these shortcomings, FR3 band communications can fundamentally employ digital and / or analog beamforming. However, because link quality between beams in the FR3 band can vary significantly, optimal operation in FR3 band cells requires identifying the optimal beam and supporting terminals' use of that beam.

[0142] Depending on the frequency characteristics of each band described above, cells in the FR1 band can operate as primary cells (PCells), transmitting and receiving control signals for carrier aggregation (CA) in addition to general communication. Similarly, cells in the FR3 band can operate as secondary cells (SCells), specialized for data transmission / reception using relatively large bandwidths.

[0143] FIG. 7 is a diagram illustrating the arrangement of cells by frequency band according to an example of the present disclosure.

[0144] Referring to Fig. 7, the arrangement of cells in the FR1 band and the FR2 / 3 band can be exemplified in two ways as follows.

[0145] For example, the non-co-located case may indicate a case where there is no locational correlation between a base station in the FR1 band and a base station in the FR2 / 3 band, and the co-located case may indicate a case where there is a locational correlation between a base station in the FR1 band and a base station in the FR2 / 3 band. Here, the presence of a locational correlation may mean that a cell in another band, for example, an FR2 / 3 band, is located at the center of a cell in a specific band, for example, an F1 band. As a more specific example, as illustrated in FIG. 7, a case where a base station operating an FR1 band cell also operates a cell in the FR2 / 3 band, such as an FR2 / 3 band cell configured at the center of an FR1 band cell, may correspond to a co-located case where there is a locational correlation.

[0146] Given the above two scenarios, the PCell can perform operations such as adding SCells and activating the corresponding SCells. In this case, for example, during a handover, the target PCell node can, if necessary, inherit (maintain) the SCell configuration from the existing source PCell, or add / modify / release SCells as needed through delta configuration.

[0147] In this disclosure, it is assumed that a cell in the FR1 band is a PCell in CA that transmits / receives control signals that perform addition / release operations of SCells. Furthermore, a cell in the FR3 band is an SCell in CA that can be added to or released from a terminal based on a control signal from the PCell, and performs a role capable of transmitting / receiving data at high transmission speeds.

[0148] Meanwhile, the network can add SCells to a UE as needed using RRC messages when the UE is in connected mode based on a cell in the FR1 band. These added SCells can have sub-states. The reason for allowing the sub-states to be configured along with the SCell addition is that the actual operating time of the SCell can change frequently, and the added SCell itself can also change depending on the signal level. Operating the SCell solely through SCell addition signaling without separately configuring sub-states would require constant RRC message processing, which is burdensome for the UE, and could negatively impact latency requirements due to processing delays.

[0149] Therefore, to reduce SCell addition processing delay and unnecessary terminal energy consumption, the following activated and deactivated states can be set as sub-states of the added SCell. The present invention provides two options, and the definitions for each sub-state can be as follows.

[0150] Opt 1.

[0151] - In the deactivated state, the terminal can perform at least one of the following actions:

[0152] ■ No monitoring of the PDCCH (physical downlink control channel) / PDSCH (physical downlink shared channel) of the corresponding SCell

[0153] ■ UL (uplink) transmission is not performed through PUCCH (physical uplink control channel) / PUSCH (physical uplink shared channel) in the corresponding SCell.

[0154] ■ CQI (channel quality indicator) is not measured in the corresponding SCell.

[0155] - In the activated state, the terminal can perform at least one of the following actions:

[0156] ■ PDCCH / PDSCH monitoring of the corresponding SCell

[0157] ■ UL transmission via PUCCH / PUSCH in the corresponding SCell

[0158] ■ Perform CQI measurement / reporting on the corresponding SCell

[0159] Based on the above, it is proposed that in the deactivated state, the terminal performs RS (reference signal) signal measurement and reporting operations for fast SCell activation.

[0160] Opt 2.

[0161] - Deactivated state: The terminal can perform at least one of the following actions:

[0162] ■ PDCCH / PDSCH monitoring of the corresponding SCell is not performed.

[0163] ■ UL transmission via PUCCH / PUSCH is not performed on the corresponding SCell.

[0164] ■ CQI is not measured in the corresponding SCell.

[0165] - Activated state: The terminal can perform at least one of the following actions:

[0166] ■ PDCCH / PDSCH monitoring of the corresponding SCell

[0167] ■ UL transmission via PUCCH / PUSCH in the corresponding SCell

[0168] ■ Perform CQI measurement / reporting on the corresponding SCell

[0169] Based on the above, we propose the introduction of an additional sub state, and the following actions can be performed in the additional sub state.

[0170] - Dormant state:

[0171] ■ It performs the same operation as the Deactivated state, and additionally, it must perform RS signal measurement and reporting operations for fast SCell activation.

[0172] As a difference from the existing method, in NR, no RS measurement and reporting operations are performed in the deactivated state. In LTE, an operation to measure and report a CSI-RS (channel state information - reference signal) allocated to a corresponding SCell can be performed in the deactivated state. However, in the present disclosure, instead of performing an operation to allocate and transmit a CSI-RS to each terminal in the deactivated SCell, an SSB (synchronization signal block) that does not require separate configuration can be transmitted from each SCell, and an operation can be performed in which the terminal measures this SSB. If this method is followed, there is an advantage in that it can reduce the waste of resources that are allocated to each cell for CSI-RS that is not currently in use. In particular, from the perspective of energy consumption of the terminal according to the measurement, the SSB can be included in the L3 (layer 3) measurement object (i.e., measurement object) for RRM (radio resource management) without configuring a separate measurement object specialized for the corresponding SCell.

[0173] Typically, networks provide L3 measurement configurations to UEs prior to SCell configuration, and decide whether to add SCells based on the UE's report. Therefore, in most cases, SSB measurements for the corresponding SCell frequency are preconfigured for L3 RRM measurements. Therefore, SSB measurements themselves are not a new operation for fast SCell activation, and thus do not increase the measurement complexity for fast SCell activation or increase the energy consumption associated with the measurement.

[0174] Furthermore, in LTE, information via CSI-RS does not consider the beams available for use on a given SCell or the beam information itself. In this regard, the present disclosure differs from existing technologies in that the network can provide UEs with information on available or optimal beams at the time of activation for deactivated SCells.

[0175] FIG. 8 is a diagram for explaining the possibility of the roles of cells and CAs according to an NES, i.e., a network energy saving method, according to an example of the present disclosure.

[0176] In terms of its role in CA operation, a PCell can add / modify / release SCells. In the present disclosure, a PCell may be a cell using a frequency in the FR1 band, as described above in FIG. 7, and an SCell may be implemented as a cell using a frequency in the FR3 band.

[0177] Also, from the perspective of NES (Network Energy Saving), the terminal is normally connected to a synchronous cell, and for NES, certain cells may be turned off. When a cell is turned off, reference signals (RSs) that indicate the signal strength of the cell, including SSB, and the identity (ID) of the cell itself are not transmitted. Accordingly, the turned off cell may not be able to serve the terminal in connected mode, and may not be able to serve the terminal in idle / inactive mode. In contrast, a cell that is turned on by a synchronous cell or turned on at the request of the terminal transmits SSB and cell-specific RSs, and can communicate with the terminal through these.

[0178] In this situation, a synchronous cell can perform the role of a PCell, and a cell in the NES that is turned off can perform the role of an SCell. That is, a synchronous cell is normally connected to a terminal, and at the request of the network or the terminal, can transmit a signal to the terminal instructing the addition or release of a specific cell in the turned off state. In addition, the synchronous cell can turn on the cell in the turned off state by adding it to the terminal. When a cell in the NES that was turned off is added to the terminal as an SCell through the synchronous cell, it can be instructed to transmit its SSB and perform the SSB transmission accordingly.

[0179] FIG. 9 is a diagram for explaining a fast SCell activation operation based on two sub states according to an example of the present invention.

[0180] In this example, the network can send a configuration to add or modify an SCell to the UE via an RRC message, and can also indicate a specific state of the SCell while sending such configuration. This state can be either a deactivated state or an activated state, depending on the option 1 described above. In Fig. 9, the PCell can be a cell using a frequency in the FR1 band, and can be a synchronous cell from the NES perspective described above in Fig. 8. In addition, the C-SCells in Fig. 9 are candidate SCells, and among the cells added as SCells, they can be cells that provide configuration information for fast SCell activation to the UE in the deactivated state.

[0181] Referring to FIG. 9, a terminal (UE) (910) can be established in a connection state with a PCell (920).

[0182] In the connected state, the terminal (910) can receive measurement settings for RRM from the PCell (920) (S901). This measurement setting, as illustrated in FIG. 9, is a layer 3 (L3)-based measurement setting, and can be provided to the terminal (910) through measurement setting information (measConfig) in an RRC message (e.g., an RRC reconfiguration message), and the terminal (910) can transmit a response thereto (e.g., an RRC reconfiguration complete message) to the base station of the PCell (920) (S902). The measurement setting can include frequency information at which cells (931, 932, 933) that can be configured as SCells are located, and the terminal (910) can perform Layer 3-based measurement and reporting operations for cells existing in the corresponding frequencies based on the frequency information (S903).

[0183] The base station of the PCell (920) that has received a measurement report from the terminal (910) can select candidate cells to be added as SCells and determine SCell addition for the terminal based on the selected cells (S904).

[0184] The base station (920) can transmit cell configuration information (servingCellconfiguration) of selected cells to the terminal (910) via an RRC message (for example, an RRCReconfiguration message) (S905). The servingCellconfiguration can include cell specific configuration information (servingCellConfigCommon) and UE specific configuration information (ServingCellConfig), and can include PHY layer information and MAC layer information (more detailed information can be found through the fields of ServingCellConfig and ServingCellConfigCommon of TS 38.331).

[0185] Additionally, the base station (920) can explicitly convey the state of the corresponding SCells via the RRC message. Here, the state of the corresponding SCell can be set to a deactivated state or an activated state. If the configuration information does not include an explicit indicator, the state of the corresponding SCell can be considered to be a deactivated state.

[0186] When the corresponding SCell is set to the deactivated state, the RS configuration for fast SCell activation of the corresponding SCell may be provided to the terminal (910) along with information for setting the state. The RS configuration may include the cell ID (ARFCN (absolute radio frequency channel number) and PCI (physical cell ID), and / or serving cell index (ServCellId)) of the corresponding SCell, the measurement RS type operated in the corresponding SCell, and related information.

[0187] - If the RS type is an SSB type, the RS configuration may include SSB configuration information (e.g., frequency, SCS (subcarrier spacing), periodicity, SSBPositionInBurst (time domain position in a half frame with index mapping of SS block per index), SSB Tx power value). This information is super set SSB information, and if subset SSB configuration information is given later, it is used as information referred to in the subset SSB.

[0188] - When the RS type is a CSI-RS type, the RS configuration may include CSI-RS resource and / or resource set information (e.g., ID and Time / Frequency information of the corresponding resource(s) (i.e., information about the location of the corresponding resource in time and / or frequency) and, when CSI-RS transmission is repeated, periodicity information on the time axis and the SFN (system frame number) indicating the start of the corresponding period, relationship with the subframe, and offset value), and CSI-RS resource type information (periodic, aperiodic (AP), semi-persistent (SP)).

[0189] - Either of the above RS types can be indicated.

[0190] - In case of CSI-RS type, it can be the same RS as the RS for CQI measurement in the activation state of the corresponding SCell, or it can be a different (lighter) RS. Here, a lighter RS ​​can mean that the density of the corresponding CSI-RS is lower in the time and frequency domain. Since the CSI-RS of the activated SCell in the connected state is used for various purposes such as not only signal strength measurement of RSRP (reference signal received power) / RSRQ (reference signal received quality) but also channel estimation and CQI measurement for MIMO (multiple input multiple output) operation, the RS for signal strength measurement for fast SCell activation proposed in this disclosure can be defined as an RS with a lower resource density, that is, an RS with a smaller number of resources on which the CSI-RS is actually transmitted on a given time and frequency resource, as a light RS.

[0191] - In case of SSB type, among the set SSB indices, it may be an RS corresponding to some SSB indices additionally indicated to the terminal. In this case, all (super set) SSB indices are cell-specific common information generally applied in the corresponding SCell, and may mean SSBs already considered for each frequency in the MO (measurement object) for L3. However, in the present disclosure, it can be seen that only some SSBs for tracking the beam of the SCell are set for the terminal. That is, the terminal may consider only a subset SSBs among the super set SSBs for measurement / reporting of fast SCell activation, and perform measurement and reporting for the corresponding subset SSBs. If the subset SSB configuration information is not set for the terminal, the terminal may perform measurement and reporting operations according to the super set SSB configuration information.

[0192] The measurement and reporting operation of RS for the above fast SCell activation can be set as one of the CSI-RS measurement operations of L1 (layer 1) performed by the terminal. To this end, in the L1 CSI measurement reporting configuration performed in the PCell, linkage information (mapping information) between the serving cell index of the cell for the fast SCell activation as a measurement target and the super set SSB or subset SSB index information indicated by the corresponding cell can be set for the terminal. In particular, the L1 CSI measurement reporting configuration can include a plurality of serving cell indices and SSB index linkage information in a corresponding cell among the plurality of serving cells. The terminal can measure and report only the SSB indicated by the corresponding SCell among the candidate SCells.

[0193] The configuration information for reporting the RS measurement result for the fast SCell activation may also be set as one of the CSI-RS measurement and reporting operations of L1. Here, the CSI-RS measurement and reporting operation of L1 may mean a measurement and reporting operation performed according to a CSI-RS measurement and reporting method (setting), which includes both resource configuration information of the CSI-RS that is the measurement target set on the L1 of the current PCell and reporting configuration information regarding how to report the measured value for the corresponding CSI-RS. As proposed in the present disclosure, if the RS measurement and reporting operation for fast SCell activation is set as one of the CSI-RS measurement / reporting operations of L1, in addition to the CSI-RS measurement and measurement result reporting operation within the PCell being performed between the PCell and the UE according to the existing CSI-RS measurement / reporting configuration of L1, the UE performs measurement on the CSI-RS transmitted from the added SCell and reports the result to the PCell, not the SCell. That is, the measurement and reporting configuration information of the existing PCell-based L1 CSI-RS can be considered by extending it to the CSI-RS measurement for other cells and reporting operations to the PCell.

[0194] At this time, measurement reporting methods include Periodic Report, AP (aperiodic), and SP (semi-persistent) types. The network can configure reporting cycle values ​​for each terminal for each case. Additionally, event-triggered reporting, which reports measured results based on specific conditions, can be specified in the configuration information for the report. At this time, the condition information for the measurement report may be set to perform a report when, among the plurality of candidate SCells, the signal intensity of a specific candidate cell is greater than or less than a threshold value, or the signal intensity of a specific candidate cell is greater than or less than the signal intensity of another candidate cell by an offset value, or the signal intensity of a specific beam of a specific candidate SCell among the candidate SCells is greater than or less than the threshold value, or greater than the signal intensity of a beam of another candidate cell by an offset value. In order to determine whether such conditions are satisfied, each event type that instructs an event to perform an absolute comparison and a relative comparison of the serving cell index of each candidate cell and the serving cell index, offset value, threshold value, signal intensity of each cell, and / or beam intensity of each cell may be indicated in the report configuration. A terminal that has received such an event triggered instruction may measure the measurement target, and when the event is satisfied, the cell signal intensity of the relevant candidate cell and / or the signal intensity value of the relevant beam of the relevant cell may be included in the measurement report and transmitted to the network.

[0195] For reference, in the measurement and reporting steps of the RS, the report is performed to the network through the PCell that received the instruction / configuration. At this time, the measurement result may be transmitted as included in the UL MAC CE (control element) or UCI (uplink control information). In addition, depending on the type of RS for CSI measurement, which is set to one of Periodic, Aperiodic, and semi-persistent, the possible reporting operations of the terminal may also be limited to at least one of Periodic, Aperiodic, or semi-persistent.

[0196] In the above CSI measurement report configuration, the RS configuration information for fast SCell activation (i.e., candidate SCell index and subset SSB index in the corresponding cell, or CSI-RS resource information in the corresponding cell) may be configured in association with an indicator for fast SCell activation among the configuration information for CSI measurement / report of the PCell. In addition, the reporting configuration information for the measurement for fast SCell activation may also be configured for the terminal in association with a separate indicator indicating that the report type is a report configuration for fast SCell activation.

[0197] Meanwhile, the existing Layer 1 measurement and reporting can be performed by the terminal that has been configured for the measurement and reporting measuring the corresponding CSI specific RS and transmitting a report according to the possible report type among periodic report, semi-persistent report, and aperiodic report. The configuration of each CSI-RS resource and the availability / disability of the reporting configuration type corresponding to the corresponding resource configuration are as follows. Basically, the periodic CSI-RS resource can report the periodic CSI report, semi-persistent CSI report, and aperiodic CSI report types, the semi-persistent CSI-RS resource can report the semi-persistent CSI report and aperiodic CSI report types, and the aperiodic CSI-RS resource can only report the aperiodic CSI report type. This is because the format of the measurement report generated based on the corresponding resource also becomes available / disabled depending on whether the resource provision format is provided sufficiently in time (e.g., provided periodically) or not (e.g., provided singly).

[0198] The following [Table 1] contains the contents of Table 5.2.1.4-1: Triggering / Activation of CSI Reporting for the possible CSI-RS Configurations of TS 38.214.

[0199] [Table 1]

[0200]

[0201] Instead of the above CSI-RS configuration, the network can provide the UE with a reporting configuration that configures a Period CSI report, an SP CSI report, or an AP CSI report, considering the RS for fast SCell activation of the deactivated SCell. Periodic CSI can report measurement information for a given period by configuring L1 measurement / reporting with RRC. When SP CSI is triggered via MAC CE, the corresponding measurement report can be transmitted on the PUCCH, and when triggered via DCI, the corresponding measurement report can be transmitted on the PUSCH. Here, the PUCCH or PUSCH can refer to the current PCell (or PSCell in a dual connectivity situation).

[0202] The terminal (910) that receives the RRCReconfiguration message including the above information transmits an RRC complete message (e.g., RRCReconfiguration complete message) to the network (920) (S906) and measures the RS for fast SCell activation of the SCells in the deactivated state (S907). At this time, the terminal can perform measurement on the SSB or CSI-RS (S908) transmitted from the SCells configured as described above. In addition, the terminal (910) can determine whether the condition is satisfied when a conditional report (e.g., the above-described event triggered report) is configured. In the case of timed reporting (e.g., periodic reporting), the measurement result can be reported to the base station based on the previously configured report configuration, and the reporting can be performed through the L1 report of the PCell as described above in [Table 1] (S909).

[0203] The network (920) that receives the above measurement report can determine an SCell to be activated among the added SCells (S910). Then, the network can instruct the terminal (910) to activate at least one SCell that has been determined to be activated (S911). At this time, the activation instruction can be transmitted to the terminal via DL MAC CE or DCI, and in the case of DCI, if it is divided into roles according to SpCell (PCell or PSCell) or NES application, it can be transmitted via a synchronous cell. If separate parameters for integrity protection and / or ciphering are preset for the terminal (910) via RRC, the terminal can perform a secure operation for the MAC CE that provides the activation instruction based on the preset parameters.

[0204] The above activation indication information may include information about the combination of the serving cell index or PCI of the SCell to be activated among the added SCells and the ARFCN. In addition, the above activation indication information may include information about the target beam that can be used in the activated SCell. Here, the target beam information may be provided through the TCI (transmission configuration indicator) state (UL or DL ​​or unified TCI state) ID of the SCell, or the SSB index of the SCell.

[0205] The terminal (910) can perform the operation of the activated SCell using the beam indicated as the target beam in the activated SCell (S912). Here, the operation of the activated SCell means, for example, performing random access set in association with the indicated beam in the corresponding SCell (in the case of a non-co-located cell), or monitoring a control channel (e.g., PDCCH) provided from the indicated beam, obtaining a necessary control signal or DL / UL resource scheduling from the corresponding PDCCH (S913), and then performing communication based thereon (in the case of a co-located cell). In addition, the terminal (910) can additionally perform PUSCH / PUCCH transmission using the target beam indicated in the corresponding SCell if there is no separate beam change instruction.

[0206] The above activation indication information may include information indicating a group when one or more SCells are grouped into a group, and may be transmitted to a terminal when adding an SCell. For example, the activation indication information may indicate an ID of an SCell group set as the group in addition to indicating an ID of a specific SCell. As a more specific example, the activation indication information may include an SCell group ID of the corresponding SCell group. In this case, target beam information to be used in each activated SCell in the corresponding SCell group may be indicated in conjunction with the information of each SCell. For example, beam information of each activated SCell may be indicated in a manner in which each target beam information is sequentially included based on the order of the serving cell ID with the lowest index among the SCells in the configured SCell group when adding an SCell. That is, if the network is configured to include serving cell IDs 2, 3, and 5 for SCell group ID 1 when adding an SCell, the activation indication information includes information for group ID 1 and may sequentially include {TCI state ID 2, TCI state ID 3, TCI state ID 6} information. In this case, the terminal can determine that the beam for serving cell ID 2 is set to TCI state ID 2, the beam for serving cell ID 3 is set to TCI state ID 3, and the beam for serving cell ID 5 is set to TCI state ID 6, according to the order of the serving cell IDs of the SCells corresponding to group ID 1.

[0207] FIG. 10 is a diagram illustrating a fast SCell activation operation based on three sub states according to an example of the present disclosure.

[0208] The three sub-states in this disclosure may refer to the deactivated state, activated state, and dormant state of Option 2 described above. The difference between this example and the two previously proposed sub-state scenarios is that the activated state is the same, but the deactivated state does not perform operations for fast CA activation (other than this, the remaining operations are the same). In addition, the new dormant state is the same as the deactivated state, but it differs in that it performs operations for fast CA activation.

[0209] Referring to Fig. 10, PCell (1020) may be a cell using a frequency in the FR1 band. Furthermore, from an NES perspective, PCell (1020) may be a synchronous cell. The C-SCells (1031, 1032, 1033) illustrated in Fig. 10 may be candidate SCells, and among the cells added as SCells, may be cells that provide configuration information for fast SCell activation to the terminal (1010) in the dormant state.

[0210] The example of Fig. 10 may correspond to the FR1 / FR3 or FR1 / FR2 co-located case among the cell arrangements described in Fig. 7 in terms of cell arrangement, but is not limited to this case. When a terminal accesses a PCell or synchronous cell corresponding to the FR1 band in connected mode, the network may blind add SCells co-located with the PCell. Here, blind addition may mean adding the SCell without a separate measurement result, assuming that the terminal will approach the cell area of ​​the candidate SCells, considering the co-located case where SCell candidate cells are overlapped at the center of the PCell, rather than adding the SCell based on the L3 measurement result as is usually the case.

[0211] A network (1020) can transmit SCell configuration information (servingCellconfiguration) for cells determined to be added to a terminal (1010) in a connected state via an RRC message (for example, an RRCReconfiguration message) (S1001). The servingCellconfiguration can include cell specific configuration information (servingCellConfigCommon) and UE specific configuration information (ServingCellConfig), and can include PHY layer information and MAC layer information (for more detailed information, refer to the fields of servingCellConfig and ServingCellConfigCommon of TS 38.331).

[0212] Additionally, the network (1020) can explicitly indicate the state of the corresponding SCells to the terminal (1010) along with the serving cell configuration information. Here, the state can be set to a deactivated state, a dormant state, or an activated state. If the serving cell configuration information does not explicitly indicate the state (activated state or dormant state) of the corresponding SCell, the state of the corresponding SCell can be considered a deactivated state. In the example of FIG. 10, it is assumed that the network indicates the deactivated state of the SCell.

[0213] In addition, the serving cell configuration information may include fast SCell activation configuration information for operation of the added SCells in the dormant state. The serving cell configuration information for adding the SCell may be transmitted to the terminal (1010) via an RRCReconfiguration message, and this RRC message may additionally include L3 RRM measurement configuration information for measuring the candidate SCell and neighboring cells. The L3 RRM measurement information may, for example, set information about the frequencies of the SCells and neighboring cells in the MO for the terminal (1010). The terminal (1010) may perform Layer 3-based measurement and reporting operations for cells existing in the corresponding frequency based on the measurement information.

[0214] The configuration for the above fast SCell activation may also include RS configuration for fast SCell activation of the SCell, which is to be performed when the SCell transitions to the dormant state when the SCell is set to the deactivated state. The RS configuration may include the cell ID (ARFCN and PCI, and / or serving cell index (ServCellId)) of the SCell, the measurement RS type operated in the cell, and related information.

[0215] - If the RS type is an SSB type, the RS configuration may include SSB configuration information (e.g., frequency, SCS (subcarrier spacing), periodicity, SSBPositionInBurst (time domain position in a half frame with index mapping of SS block per index), SSB Tx power value). This information is super set SSB information, and if subset SSB configuration information is given later, it is used as information referred to in the subset SSB.

[0216] - When the RS type is a CSI-RS type, the RS configuration may include CSI-RS resource and / or resource set information (e.g., ID and T / F information of the corresponding resource(s) (i.e., information about the location of the corresponding resource in time and / or frequency) and, when CSI-RS transmission is repeated, periodicity information on the time axis and the SFN (system frame number) indicating the start of the corresponding period, relationship with the subframe, and offset value), and CSI-RS resource type information (periodic, aperiodic (AP), semi-persistent (SP)).

[0217] - Either of the above RS types can be indicated.

[0218] - In case of CSI-RS type, it can be the same RS as the RS for CQI measurement in the activation state of the corresponding SCell, or it can be another (lighter) RS. Here, a lighter RS ​​can mean that the density of the corresponding CSI-RS is lower in the time and frequency domain. Since the CSI-RS of the activated SCell in the connected state is used for various purposes such as not only signal strength measurement of RSRP (reference signal received power) / RSRQ (reference signal received quality) but also channel estimation and CQI measurement for MIMO (multiple input multiple output) operation, the RS for signal strength measurement for fast SCell activation proposed in this disclosure can be defined as a light RS as an RS with a lower density, that is, an RS to which fewer resources are allocated than the resources on which the CSI-RS is actually transmitted in a given time and frequency resource.

[0219] - In case of SSB type, among the set SSB indices, it may be an RS corresponding to some SSB indices additionally indicated to the terminal. In this case, all (super set) SSB indices are cell-specific common information generally applied in the corresponding SCell, and may mean SSBs already considered for each frequency in the MO (measurement object) for L3. However, in the present disclosure, it can be seen that only some SSBs for tracking the beam of the SCell are set for the terminal. That is, the terminal may consider only a subset SSBs among the super set SSBs for measurement / reporting of fast SCell activation, and perform measurement and reporting for the corresponding subset SSBs. If the subset SSB configuration information is not set for the terminal, the terminal may perform measurement and reporting operations according to the super set SSB configuration information.

[0220] The measurement and reporting operation of RS for the fast SCell activation may be configured as one of the CSI-RS measurement operations of L1 (layer 1) performed by the terminal. To this end, in the L1 CSI measurement reporting configuration performed in the PCell, linkage information (mapping information) between the serving cell index of the cell for the fast SCell activation as a measurement target and the super set SSB or subset SSB index information indicated by the corresponding cell may be configured for the terminal. In particular, the L1 CSI measurement reporting configuration may include a plurality of serving cell indices and SSB index linkage information in a corresponding cell among the plurality of serving cells. The terminal may measure and report only the SSB indicated by the corresponding SCell among the candidate SCells.

[0221] The configuration information for reporting the RS measurement result for the fast SCell activation may also be set as one of the CSI-RS measurement and reporting operations of L1. Here, the CSI-RS measurement and reporting operation of L1 may mean a measurement and reporting operation performed according to a CSI-RS measurement and reporting method (setting), which includes both resource configuration information of the CSI-RS that is the measurement target set on the L1 of the current PCell and reporting configuration information regarding how to report the measured value for the corresponding CSI-RS. As proposed in the present disclosure, if the RS measurement and reporting operation for fast SCell activation is set as one of the CSI-RS measurement / reporting operations of L1, in addition to the CSI-RS measurement and measurement result reporting operation within the PCell being performed between the PCell and the UE according to the existing CSI-RS measurement / reporting configuration of L1, the UE performs measurement on the CSI-RS transmitted from the added SCell and reports the result to the PCell, not the SCell. That is, the measurement and reporting configuration information of the existing PCell-based L1 CSI-RS can be considered by extending it to the CSI-RS measurement for other cells and reporting operations to the PCell.

[0222] At this time, measurement reporting methods include Periodic Report, AP, and SP types, and the network can configure reporting cycle values ​​for each terminal for each case. Additionally, event-triggered reporting, which reports measured results based on specific conditions, can be specified in the configuration information for the report. At this time, the condition information for the measurement report may be set to perform a report when, among the plurality of candidate SCells, the signal intensity of a specific candidate cell is greater than or less than a threshold value, or the signal intensity of a specific candidate cell is greater than or less than the signal intensity of another candidate cell by an offset value, or the signal intensity of a specific beam of a specific candidate SCell among the candidate SCells is greater than or less than the threshold value, or greater than the signal intensity of a beam of another candidate cell by an offset value. In order to determine whether such conditions are satisfied, each event type that instructs an event to perform an absolute comparison and a relative comparison of the serving cell index of each candidate cell and the serving cell index, offset value, threshold value, signal intensity of each cell, and / or beam intensity of each cell may be indicated in the report configuration. A terminal that has received such an event triggered instruction may measure the measurement target, and if the event is satisfied, the cell signal intensity of the relevant candidate cell and / or the signal intensity value of the relevant beam of the relevant cell may be included in the measurement report and transmitted to the network.

[0223] For reference, in the measurement and reporting steps of the RS, the report is performed to the network through the PCell that received the instruction / configuration. At this time, the measurement result may be transmitted as included in the UL MAC CE (control element) or UCI (uplink control information). In addition, depending on the type of RS for CSI measurement, which is set to one of Periodic, Aperiodic, and semi-persistent, the possible reporting operations of the terminal may also be limited to at least one of Periodic, Aperiodic, or semi-persistent.

[0224] In the above CSI measurement report configuration, the RS configuration information for fast SCell activation (i.e., candidate SCell index and subset SSB index in the corresponding cell, or CSI-RS resource information in the corresponding cell) may be configured in association with an indicator for fast SCell activation among the configuration information for CSI measurement / report of the PCell. In addition, the reporting configuration information for the measurement for fast SCell activation may also be configured for the terminal in association with a separate indicator indicating that the report type is a report configuration for fast SCell activation.

[0225] Meanwhile, the existing Layer 1 measurement and reporting can be performed by the terminal that has been configured for the measurement and reporting measuring the corresponding CSI specific RS and transmitting a report according to the possible report type among periodic report, semi-persistent report, and aperiodic report. The configuration of each CSI-RS resource and the availability / disability of the reporting configuration type corresponding to the corresponding resource configuration are as follows. Basically, the periodic CSI-RS resource can report the periodic CSI report, semi-persistent CSI report, and aperiodic CSI report types, the semi-persistent CSI-RS resource can report the semi-persistent CSI report and aperiodic CSI report types, and the aperiodic CSI-RS resource can only report the aperiodic CSI report type. This is because the format of the measurement report generated based on the corresponding resource also becomes available / disabled depending on whether the resource provision format is provided sufficiently in time (e.g., provided periodically) or not (e.g., provided singly). For information on how CSI reporting is enabled / disabled based on which CSI-RS resource configuration and how CSI reporting is triggered and activated, refer to [Table 1] above. Instead of the above CSI-RS configuration, the network can provide the UE with a reporting configuration that configures a Period CSI report, an SP CSI report, or an AP CSI report, taking into account the RS for fast SCell activation of the dormant state SCell. Periodic CSI can report measurement information for a given period by configuring L1 measurement / reporting with RRC.When SP CSI is triggered via MAC CE, the corresponding measurement report can be transmitted on PUCCH, and when triggered via DCI, the corresponding measurement report can be transmitted on PUSCH. Here, the PUCCH or PUSCH may refer to the current PCell (or PSCell in a dual connectivity situation).

[0226] The terminal (1010) that receives the RRC message including the above information can transmit an RRCReconfigComplete message to the network (1020) in response thereto (S1002). In addition, the terminal can add an SCell according to the network settings, and the state of the corresponding SCell can be set to deactivated and operated (S1003). The terminal (1010) can perform L3 RRM measurement according to the settings of the base station (1020) and transmit a report based on the measurement results to the network (1020) through a measurement report (S1004).

[0227] The base station (1020) of the PCell that has received the above measurement report may determine to transition to dormant state those SCells among the added SCells that have relatively good signal strength with respect to the terminal (1010) (S1005). In addition, the base station (1020) may transmit to the terminal (1010) information on transitioning the determined SCells to dormant state through DL MAC CE or DCI (S1006). The information may include information on the combination of the serving cell index or PCI of the SCell transitioned to dormant state and the ARFCN.

[0228] The terminal (1010) that receives the above information transitions the SCells indicated by the network (1020) to the dormant state, measures the RSs previously configured for fast SCell activation (S1007), and then performs a measurement result reporting operation. Here, the RSs to be measured may be SSB or CSI-RS transmitted from SCells (1031, 1032, 1033) configured for the terminal (S1008). If a conditional report (e.g., an event triggered report) is configured, the terminal (1010) can evaluate whether the condition is satisfied. In the case of a timed report (e.g., a periodic or aperiodic report), the measurement result is reported according to the report configuration previously configured for the terminal (1010), and as in the above-described [Table 1], the terminal (1010) can perform the above reporting through the L1 report of the Pcell (S1009).

[0229] The network (1020) that receives the measurement report from the terminal (1010) can determine an SCell to be activated among the added SCells (S1010). Then, the network (1020) can instruct the terminal (1010) to activate at least one SCell that has been determined to be activated (S1011). At this time, the activation instruction can be transmitted to the terminal (1010) through DL MAC CE or DCI, and in the case of DCI, if it is divided into roles according to SpCell (PCell or PSCell) or NES application, it can be transmitted through a synchronous cell. If separate parameters for integrity protection and / or ciphering are preset for the terminal (1010) through RRC, the terminal (1010) can perform a secure operation for the MAC CE that provides the activation instruction based on the preset parameters.

[0230] The above activation indication information may include information about the combination of the serving cell index or PCI of the SCell to be activated among the added SCells and the ARFCN. In addition, the above activation indication information may include information about the target beam that can be used in the activated SCell. Here, the target beam information may be provided through the TCI (transmission configuration indicator) state (UL or DL ​​or unified TCI state) ID of the SCell, or the SSB index of the SCell.

[0231] The terminal (1010) can perform the operation of the activated SCell using the beam indicated as the target beam in the activated SCell (S1012). Here, the operation of the activated SCell means, for example, performing random access set in association with the indicated beam in the corresponding SCell (in the case of a non-co-located cell), or monitoring a control channel (e.g., PDCCH) provided from the indicated beam, obtaining a necessary control signal or DL / UL resource scheduling from the corresponding PDCCH (S1013), and then performing communication based thereon (in the case of a co-located cell). In addition, the terminal (1010) can additionally perform PUSCH / PUCCH transmission using the target beam indicated in the corresponding SCell if there is no separate beam change instruction.

[0232] The above activation indication information may include information indicating a group when one or more SCells are grouped into a group, and may be transmitted to a terminal when adding an SCell. For example, the activation indication information may indicate an ID of an SCell group set as the group in addition to indicating an ID of a specific SCell. As a more specific example, the activation indication information may include an SCell group ID of the corresponding SCell group. In this case, target beam information to be used in each activated SCell in the corresponding SCell group may be indicated in conjunction with the information of each SCell. For example, beam information of each activated SCell may be indicated in a manner in which each target beam information is sequentially included based on the order of the serving cell ID with the lowest index among the SCells in the configured SCell group when adding an SCell. That is, if the network is configured to include serving cell IDs 2, 3, and 5 for SCell group ID 1 when adding an SCell, the activation indication information includes information for group ID 1 and may sequentially include {TCI state ID 2, TCI state ID 3, TCI state ID 6} information. In this case, the terminal can determine that the beam for serving cell ID 2 is set to TCI state ID 2, the beam for serving cell ID 3 is set to TCI state ID 3, and the beam for serving cell ID 5 is set to TCI state ID 6, according to the order of the serving cell IDs of the SCells corresponding to group ID 1.

[0233] As another example for the above-mentioned Opt 1 and Opt 2, if the RS type for fast SCell activation is CSI-RS, an inter-node signal transmission and reception procedure may be required between the nodes of the SCell and the PCell. Generally, since CSI-RS is a resource that the base station allocates to each terminal, if the RS type for fast SCell activation is not SSB, the PCell must request CSI-RS allocation to the SCell through inter-node signaling, and receive the information allocated by the SCell and transmit it to the terminal, so that the terminal can perform CSI-RS measurement operation based on the CSI-RS configuration information in the corresponding cell. This will be described based on FIGS. 11a, 11b, and 12a to 12c.

[0234] FIG. 11A and FIG. 11B are diagrams for explaining CSI-RS configuration when two sub states are applied according to an example of the present disclosure.

[0235] In FIG. 11a and FIG. 11b, detailed descriptions of overlapping parts with the above-described FIG. 9 and FIG. 10 are omitted, and the focus is on the description of the interaction between the PCell node and the SCell node.

[0236] Referring to FIGS. 11a and 11b, operations (S1101, S1102, S1103, S1104) for determining candidate SCells to be added to a terminal (1110) based on a measurement report received from the terminal (1110) after the base station (1120) of the PCell provides settings for adding SCells to a terminal (1110) in a connected state and receives a response thereto are identical to the corresponding operations described above in FIGS. 9 and 10.

[0237] At this time, before the node (1120) of the PCell adds the SCells (1131, 1132, 1133) to the terminal (1110) in a deactivated state, the node (1120) of the PCell can transmit a signal requesting CSI-RS configuration for fast SCell activation to each node of the SCell that is the target of addition (S1105). This signal can be an Xn message (when the PCell node and the SCell node belong to different base stations) or an F1 message (when the PCell node and the SCell node share the same CU (central unit) and have different DUs (distributed units).

[0238] Nodes (1131, 1132, 1133) of SCells that have received the above inter-node message perform CSI-RS resource allocation for the corresponding terminal (1110) and transmit the allocated CSI-RS resource information to the node (1120) of PCell so that the information on the allocated CSI-RS resources can be provided to the terminal as a CSI-RS setting for fast SCell activation purposes (S1106). From this point on, the corresponding SCell can perform CSI-RS transmission.

[0239] The PCell's node (1120), which has obtained information about CSI-RS allocation from the SCell's nodes (1131, 11325, 1133), may provide a setting to enable at least some of the SCells to be added to the terminal to be added in an inactive state via an RRC message (S1107). In this case, the setting may include providing the CSI-RS resource allocation information received from the SCell's nodes (1131, 1132, 1133) to the terminal as a measurement setting for each SCell.

[0240] The terminal (1110) performs measurements on CSI-RS received from SCells (1131, 1132, 1133) based on the settings received from the base station (1120) of the PCell (S1108, S1109) and reports the measurement results to the base station (1120) of the PCell (S1110). Thereafter, the base station (1120) of the PCell determines SCells to be activated based on the measurement report from the terminal (1110) (S1111) and provides instructions therefor to the terminal (S1112), and the operations performed by the terminal on the activated SCells (S1113, S1114) are identical to the corresponding operations of FIGS. 9 and 10 .

[0241] FIG. 12a, FIG. 12b, and FIG. 12c are diagrams for explaining CSI-RS configuration when three sub states are applied according to an example of the present disclosure.

[0242] In FIG. 12a, FIG. 12b and FIG. 12c, similar to FIG. 11a and FIG. 11b, detailed descriptions of overlapping portions with the aforementioned FIG. 9 and FIG. 10 are omitted, and the focus is on the description of the interaction between the PCell node and the SCell node.

[0243] Referring to FIGS. 12a to 12c, before a node (1220) of a PCell adds SCells to a terminal (1210) that is in a deactivated state, the node (1220) of the PCell may send a signal requesting CSI-RS configuration for fast SCell activation to nodes (1231, 1232, 1233) of the SCell that is the addition target (case 1) (S1201). As another example, after adding SCells (1231, 1232, 1233) to the terminal (1210), and before transitioning to a dormant state, the node (1220) of the PCell may send a signal requesting CSI-RS configuration for fast SCell activation to nodes (1231, 1232, 1233) of the transition target SCells (case 2) (S1208).

[0244] In both the above cases 1 and 2, the nodes (1231, 1232, 1233) of the SCells that have received a request from the node (1220) of the PCell can allocate CSI-RS resources for fast SCell activation and transmit CSI-RS resource configuration information to the node (1220) of the PCell (S1202 of case 1, S1209 of case 2), and can start CSI-RS transmission through the corresponding SCells (1231, 1232, 1233) (S1212). The PCell node (1220) that has received the above CSI-RS resource configuration information can, in case 1, transmit the configuration of the RS for fast SCell activation to the terminal (1210) through an RRCReconfiguration message for SCell addition (S1203), and in case 2, after transmitting the RRCReconfiguration message for SCell addition (S1203), the PCell node (1220) can provide the terminal (1210) with the resource configuration information for the RS for fast SCell activation or the preconfigured index of the CSI-RS resource configuration information in a separate RRCReconfiguration message or in a MAC CE or DCI that transitions the corresponding SCell to a dormant state (S1207, S1210). Here, the preconfiguration of the CSI-RS resource configuration information described above can be delivered to the terminal (1210) in advance through the RRCReconfiguration message for SCell addition.

[0245] A message (Xn or F1) sent by a node (1220) of a PCell to a node (1231, 1232, 1233) of SCells when requesting CSI-RS resource allocation may include an ID of the terminal (Xn AP ID or F1 AP ID), an indicator requesting the configuration of a CSI-RS for fast SCell activation, and additionally, a period request value based on the periodicity of the CSI-RS, or an aperiodic or semi-persistent transmission type characteristic, or may include a request value of a period corresponding to each transmission type.

[0246] In this way, the terminal (1210) that receives the measurement settings of each SCell from the base station (1220) of the PCell performs measurements on the SCells added in an inactive state (case 1) or converted to a dormant state (case 2) and reports the measurement results to the base station (S1206, S1211, S1213). The base station (1220) determines the activation of the SCell based on the measurement report from the terminal (1210) (S1214), and can transmit an instruction for SCell activation to the terminal (1210) (S1215). The operations of the terminal (S1216, 1217) performed on the activated SCells thereafter are the same as those in FIGS. 9 and 10 described above.

[0247] The 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.

[0248] When implemented in software, a computer-readable storage medium storing one or more programs (software modules) may be provided. The one or more programs stored in the computer-readable storage medium are configured for execution by one or more processors within an electronic device. The one or more programs include instructions that cause the electronic device to execute methods according to the embodiments described in the claims or specification of the present invention.

[0249] These programs (software modules, software) may be stored in random access memory, non-volatile memory including flash memory, read only memory (ROM), electrically erasable programmable read only memory (EEPROM), magnetic disc storage device, compact disc ROM (CD-ROM), digital versatile discs (DVDs) or other forms of optical storage device, magnetic cassette. Or, they may be stored in a memory configured as a combination of some or all of these. In addition, each configuration memory may be included in multiple numbers.

[0250] Additionally, the program may be stored in an attachable storage device that is accessible via a communication network such as the Internet, an intranet, a local area network (LAN), a wide local area network (WLAN), a storage area network (SAN), or a combination thereof. Such a storage device may be connected to a device implementing an embodiment of the present invention via an external port. Additionally, a separate storage device on the communication network may be connected to a device implementing an embodiment of the present invention.

[0251] In the specific embodiments of the present invention described above, components included in the invention are expressed in the singular or plural form depending on the specific embodiment presented. However, the singular or plural expressions are selected to suit the presented situation for convenience of explanation, and the present invention is not limited to singular or plural components. Even components expressed in the plural form may be composed of singular elements, or even components expressed in the singular form may be composed of plural elements.

[0252] While the detailed description of the present invention has described specific embodiments, it is clear that various modifications are possible without departing from 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 not only by the scope of the following claims but also by equivalents thereof.

Claims

In a method of a terminal in a wireless communication system, A step of receiving, from a base station, a radio resource control (RRC) message adding secondary cells (SCells) to the terminal, wherein the RRC message includes measurement settings for each of at least one SCell among the SCells that is set to an inactive state; A step of performing a measurement on at least one SCell based on the above measurement settings; A step of transmitting a measurement report for the measurement to the base station; and A step of receiving a signal indicating activation of an SCell among the at least one SCell from the base station, The above measurement settings include SCell identification information and measurement resource information mapped to the SCell identification information, A terminal method characterized in that the above measurement resource information includes information indicating a measurement target SSB among SSBs (synchronization signal blocks) transmitted from a corresponding SCell. In the first paragraph, The above measurement settings further include measurement report setting information mapped to the SCell identification information, The above measurement report setting information includes information about the type of report and an indicator indicating that the type of report is a report setting for fast SCell activation. A method of a terminal, characterized in that the above measurement report is transmitted to the base station through signaling of layer 1. In the first paragraph, A step of receiving information from the base station to switch the SCell to a dormant state; A step of performing a measurement on the SCell based on the above measurement settings; and Further comprising a step of transmitting the result of measurement for the SCell to the base station, A signal indicating activation of the above SCell is received after the results of the above measurement are transmitted to the base station, The above measurement report is transmitted to the base station through signaling of layer 3, A method of a terminal, characterized in that the result of the above measurement is transmitted to the base station through signaling of layer 1. In the first paragraph, The signal indicating the activation of the above SCell is received through MAC (medium access control) CE (control element) or DCI (downlink control information). A method of a terminal, characterized in that the MAC CE or the DCI includes the ID (identity) of the SCell and target beam information in the SCell. In a method of a base station in a wireless communication system, A step of transmitting a radio resource control (RRC) message to a terminal for adding secondary cells (SCells) to the terminal, wherein the RRC message includes measurement settings for each of at least one SCell among the SCells that is set to an inactive state; A step of receiving a measurement report for at least one SCell based on the measurement settings from the terminal; and A step of transmitting a signal indicating activation of an SCell among the at least one SCell to the terminal, The above measurement settings include SCell identification information and measurement resource information mapped to the SCell identification information, A method of a base station, characterized in that the above measurement resource information includes information indicating a measurement target SSB among SSBs (synchronization signal blocks) transmitted from a corresponding SCell. In paragraph 5, The above measurement settings further include measurement report setting information mapped to the SCell identification information, The above measurement report setting information includes information about the type of report and an indicator indicating that the type of report is a report setting for fast SCell activation. A method of a base station, characterized in that the above measurement report is received from the terminal through signaling of layer 1. In paragraph 5, A step of transmitting information to the terminal to switch the SCell to a dormant state based on the measurement report; and Further comprising a step of receiving the result of measurement for the SCell from the terminal, A signal indicating activation of the SCell is transmitted to the terminal based on the results of the measurement, The above report is received from the terminal through signaling of layer 3, A method of a base station, characterized in that the result of the above measurement is received from the terminal through signaling of layer 1. In paragraph 5, The signal indicating the activation of the above SCell is transmitted through MAC (medium access control) CE (control element) or DCI (downlink control information). A method of a base station, characterized in that the MAC CE or the DCI includes the ID (identity) of the SCell and target beam information in the SCell. In a wireless communication system, at a terminal, Transmitter and receiver; and A control unit for controlling the transceiver to receive a radio resource control (RRC) message from a base station for adding secondary cells (SCells) to the terminal, wherein the RRC message includes a measurement setting for each of at least one SCell set to an inactive state among the SCells, performing measurement on the at least one SCell based on the measurement setting, and controlling the transceiver to transmit a measurement report for the measurement to the base station, and controlling the transceiver to receive a signal from the base station for indicating activation of an SCell among the at least one SCell, The above measurement settings include SCell identification information and measurement resource information mapped to the SCell identification information, A terminal characterized in that the above measurement resource information includes information indicating a measurement target SSB among SSBs (synchronization signal blocks) transmitted from a corresponding SCell. In paragraph 9, The above measurement settings further include measurement report setting information mapped to the SCell identification information, The above measurement report setting information includes information about the type of report and an indicator indicating that the type of report is a report setting for fast SCell activation. A terminal characterized in that the above measurement report is transmitted to the base station through signaling of layer 1. In paragraph 9, The control unit controls the transceiver to receive information from the base station to switch the SCell to a dormant state, perform measurement on the SCell based on the measurement settings, and control the transceiver to transmit the result of the measurement on the SCell to the base station. A signal indicating activation of the above SCell is received after the results of the above measurement are transmitted to the base station, The above measurement report is transmitted to the base station through signaling of layer 3, A terminal characterized in that the result of the above measurement is transmitted to the base station through signaling of layer 1. In paragraph 9, The signal indicating the activation of the above SCell is received through MAC (medium access control) CE (control element) or DCI (downlink control information). A method of a terminal, characterized in that the MAC CE or the DCI includes the ID (identity) of the SCell and target beam information in the SCell. In a wireless communication system, at a base station, Transmitter and receiver; and A control unit for controlling the transceiver to transmit a radio resource control (RRC) message to add secondary cells (SCells) to the terminal, wherein the RRC message includes a measurement setting for each of at least one SCell set to an inactive state among the SCells, and for controlling the transceiver to receive, from the terminal, a measurement report for the at least one SCell based on the measurement setting, and for controlling the transceiver to transmit, to the terminal, a signal indicating activation of the SCell among the at least one SCell, The above measurement settings include SCell identification information and measurement resource information mapped to the SCell identification information, A base station characterized in that the above measurement resource information includes information indicating a measurement target SSB among SSBs (synchronization signal blocks) transmitted from a corresponding SCell. In Article 13, The above measurement settings further include measurement report setting information mapped to the SCell identification information, The above measurement report setting information includes information about the type of report and an indicator indicating that the type of report is a report setting for fast SCell activation. A base station, characterized in that the above measurement report is received from the terminal via layer 1 signaling. In Article 13, The signal indicating the activation of the above SCell is transmitted through MAC (medium access control) CE (control element) or DCI (downlink control information). A base station, characterized in that the MAC CE or the DCI includes the ID (identity) of the SCell and target beam information in the SCell.

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