Method and apparatus for performing frequency measurement and setting frequency measurement for a non-connected mode terminal

Abstract

The present disclosure relates to a communication method and system for integrating a fifth generation (5G) communication system with Internet of Things (IoT) technology to support higher data rates than fourth generation (4G) systems. The present disclosure can be applied to smart services based on 5G communication technology and IoT-related technologies, such as smart homes, smart buildings, smart cities, smart cars, connected cars, healthcare, digital education, smart retail, safety and security services. The present disclosure relates to a method and apparatus for performing frequency measurement and setting frequency measurement for a non-connected mode terminal in a next generation mobile communication system.

Description

Technical Field

[0001] The present disclosure relates to a method and apparatus for performing frequency measurement and setting frequency measurement for a non-connected mode terminal in a next generation mobile communication system. Background Art

[0002] In order to meet the demand for increased wireless data traffic since the deployment of 4G communication systems, efforts have been made to develop improved 5G or pre-5G communication systems. Therefore, 5G or pre-5G communication systems are also called "beyond 4G networks" or "post-LTE systems". 5G communication systems are considered to be implemented in higher frequency (millimeter wave) bands, such as the 60GHz band, in order to achieve higher data rates. In order to reduce the propagation loss of radio waves and increase the transmission distance, technologies such as beamforming, massive multiple-input multiple-output (MIMO), full-dimensional MIMO (FD-MIMO), array antennas, analog beamforming, and massive antennas are discussed in 5G communication systems. In addition, in 5G communication systems, system network improvements are being developed based on advanced small cells, cloud radio access networks (RAN), ultra-dense networks, device-to-device (D2D) communications, wireless backhaul, mobile networks, collaborative communications, coordinated multi-point (CoMP), receiving-end interference elimination, etc. In 5G systems, hybrid FSK and QAM modulation (FQAM) and sliding window superposition coding (SWSC) have been developed as advanced coded modulation (ACM), and filter bank multi-carrier (FBMC), non-orthogonal multiple access (NOMA) and sparse code multiple access (SCMA) as advanced access technologies.

[0003] The Internet, a human-centered connected network in which humans generate and consume information, is now evolving toward the Internet of Things (IoT), in which distributed entities (such as things) exchange and process information without human intervention. The Internet of Everything (IoE) has emerged, which is a combination of IoT technology and big data processing technology through connection with cloud servers. As IoT implementation requires technical elements such as "sensing technology", "wired / wireless communication and network infrastructure", "service interface technology" and "security technology", sensor networks, machine-to-machine (M2M) communication, machine-type communication (MTC), etc. have been recently studied. Such an IoT environment can provide intelligent Internet technology services to create new value for human life by collecting and analyzing data generated between connected things. IoT can be applied to various fields, including smart homes, smart buildings, smart cities, smart cars or connected cars, smart grids, healthcare, smart appliances, and advanced medical services, through the integration and combination of existing information technology (IT) with various industrial applications.

[0004] In line with this, various attempts have been made to apply 5G communication systems to IoT networks. For example, technologies such as sensor networks, machine type communications (MTC), and machine-to-machine (M2M) communications can be implemented through beamforming, MIMO, and array antennas. Cloud radio access networks (RANs) as an application of the above-mentioned big data processing technologies can also be considered as an example of the convergence of 5G technologies and IoT technologies. Summary of the invention

[0005]

Technical issues

[0006] In order to support services with high data rates and low transmission delays in the next generation mobile communication system, the base station needs to quickly configure the carrier aggregation (CA) technology or the dual connection (DC) technology to the terminal. However, configuring the above technology to the terminal requires the frequency measurement results of the terminal. Therefore, a method for quickly receiving a frequency measurement result report from the terminal is required.

[0007]

Problem Solution

[0008] According to one aspect of the present disclosure, a method performed by a terminal is provided, including: identifying whether a first frequency list is included in first information received by a radio resource control (RRC) release message; in a case where the first frequency list is included in the first information, performing measurement in an RRC_IDLE mode or an RRC_INACTIVE mode based on the first frequency list; and in a case where the first frequency list is not included in the first information, performing measurement in an RRC_IDLE mode or an RRC_INACTIVE mode based on a second frequency list included in second information received by a system information block (SIB), wherein the measurement is performed based on a synchronization signal block (SSB) configuration included in the first information or the second information.

[0009] According to another aspect of the present disclosure, a terminal is provided, comprising: a transceiver; and a controller configured to identify whether a first frequency list is included in first information received by a radio resource control (RRC) release message, and in a case where the first frequency list is included in the first information, perform measurement in RRC_IDLE mode or RRC_INACTIVE mode based on the first frequency list; and in a case where the first frequency list is not included in the first information, perform the measurement in RRC_IDLE mode or RRC_INACTIVE mode based on a second frequency list included in second information received by a system information block (SIB). The measurement is performed based on a synchronization signal block (SSB) configuration included in the first information or the second information.

[0010] According to another aspect of the present disclosure, a method performed by a base station is provided, comprising: sending first information through a radio resource control (RRC) release message; and sending second information through a system information block (SIB); wherein, in a case where the first frequency list is included in the first information, a terminal performs measurement in RRC_IDLE mode or RRC_INACTIVE mode based on the first frequency list, and in a case where the first frequency list is not included in the first information, the terminal performs measurement in RRC_IDLE mode or RRC_INACTIVE mode based on the second frequency list included in the second information received by the system information block (SIB). The measurement is performed based on a synchronization signal block (SSB) configuration included in the first information or the second information.

[0011] According to another aspect of the present disclosure, a base station is provided, comprising: a transceiver; and a controller configured to send first information through a radio resource control (RRC) release message; and send second information through a system information block (SIB); wherein, in a case where a first frequency list is included in the first information, a terminal performs measurement in an RRC_IDLE mode or an RRC_INACTIVE mode based on the first frequency list, and wherein, in a case where the first frequency list is not included in the first information, the terminal performs measurement in an RRC_IDLE mode or an RRC_INACTIVE mode based on a second frequency list included in second information received by a system information block (SIB). The measurement is performed based on a synchronization signal block (SSB) configuration included in the first information or the second information.

[0012] [Advantageous Effects of the Invention]

[0013] The present disclosure proposes a method for a terminal used in RRC idle mode or RRC inactive mode in a next-generation mobile communication system to quickly report the results of measuring the environmental frequency to the base station, thereby allowing the base station to quickly configure the CA technology or DC technology to the terminal. Specifically, when the terminal releases the connection with the network, the base station can set the configuration information for frequency measurement in the RRC message to the terminal, and the terminal has the ability to perform frequency measurement in the RRC idle mode or RRC inactive mode. When moving in the RRC idle mode or RRC inactive mode and performing a cell selection or reselection process, the terminal can perform frequency measurement based on the frequency measurement configuration information set in the RRC message or the system information of the serving cell where the terminal resides through the cell reselection process. In addition, the base station can quickly configure the CA technology or DC technology to the terminal by allowing the terminal to report the frequency measurement results immediately when establishing a connection with the network. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] The above and other aspects, features and advantages of certain embodiments of the present disclosure will become more apparent from the following detailed description in conjunction with the accompanying drawings.

[0015] Figure 1 is a diagram showing the structure of a Long Term Evolution (LTE) system according to an embodiment of the present disclosure.

[0016] Figure 2 is a diagram showing the structure of a radio protocol in an LTE system according to an embodiment of the present disclosure.

[0017] Figure 3 is a diagram showing a structure of a next generation mobile communication system according to an embodiment of the present disclosure.

[0018] Figure 4 is a diagram showing a structure of a radio protocol in a next generation mobile communication system according to an embodiment of the present disclosure.

[0019] Figure 5 The present invention is a diagram showing a process in which a terminal in a next generation mobile communication system switches from an RRC idle mode or an RRC inactive mode to an RRC connected mode and configures a carrier aggregation technology according to an embodiment of the present disclosure.

[0020] Figure 6 is a diagram showing a first embodiment according to an embodiment of the present disclosure, which enables a terminal to perform early measurement in an RRC idle mode or an RRC inactive mode and make an early measurement report in a next generation mobile communication system.

[0021] Figure 7 is a diagram showing a second embodiment according to an embodiment of the present disclosure, which enables a terminal to perform early measurement and make an early measurement report in an RRC idle mode or an RRC inactive mode in a next generation mobile communication system.

[0022] Figure 8 is a diagram showing a signal structure when a terminal performs frequency measurement on an LTE frequency in an RRC idle mode or an RRC inactive mode according to an embodiment of the present disclosure.

[0023] Fig. 9 and Fig.10 2 are diagrams each showing a signal structure when a terminal performs frequency measurement of an NR frequency in an RRC idle mode or an RRC inactive mode according to an embodiment of the present disclosure.

[0024] Fig.11 is a diagram illustrating a method in which a terminal performs frequency measurement in an RRC idle mode or an RRC inactive mode in a network in which a terminal is synchronized between different frequencies or cells according to an embodiment of the present disclosure.

[0025] Fig.12is a diagram illustrating a problem occurring when a terminal performs frequency measurement in an RRC idle mode or an RRC inactive mode in a network in which different frequencies or cells are not synchronized according to an embodiment of the present disclosure.

[0026] Fig.13 is a diagram showing a first embodiment of an effective frequency measurement method in an RRC idle mode or an RRC inactive mode according to an embodiment of the present disclosure.

[0027] Fig.14 is a diagram illustrating a second embodiment of an effective frequency measurement method in an RRC idle mode or an RRC inactive mode according to an embodiment of the present disclosure.

[0028] Fig.15 is a diagram showing a third embodiment of an effective frequency measurement method in an RRC idle mode or an RRC inactive mode according to an embodiment of the present disclosure.

[0029] Fig.16 is a diagram showing a fourth embodiment of an effective frequency measurement method in an RRC idle mode or an RRC inactive mode according to an embodiment of the present disclosure.

[0030] Fig.17 is a diagram illustrating a method in which a terminal performs frequency measurement in an RRC idle mode or an RRC inactive mode in a network in which different frequencies or cells are not synchronized according to an embodiment of the present disclosure.

[0031] Fig.18 is a diagram illustrating an operation of a terminal performing frequency measurement and reporting a measurement result in an RRC idle mode or an RRC inactive mode according to an embodiment of the present disclosure.

[0032] Fig.19 is a block diagram showing a structure of a terminal according to an embodiment of the present disclosure.

[0033] Fig. 20 is a block diagram showing the structure of a base station in a wireless communication system according to an embodiment of the present disclosure. DETAILED DESCRIPTION

[0034] Before proceeding to the following detailed description, it may be helpful to set forth definitions of certain words and phrases used throughout this patent document: the terms "include" and "comprising" and their derivatives mean inclusion without limitation; the term "or" is inclusive, meaning and / or; the phrases "associated" and "associated with" and their derivatives may mean including, being included, interconnected, containing, being contained within, connected to or connected with, coupled to or coupled with, communicable, cooperating, interleaved, juxtaposed, proximate, bound to, or having, having, and the like; and the term "controller" means any device, system, or portion thereof that controls at least one operation, such a device may be implemented in hardware, firmware, or software, or some combination of at least two thereof. It should be noted that the functionality associated with any particular controller may be centralized or distributed, whether locally or remotely.

[0035] In addition, the various functions described below can be implemented or supported by one or more computer programs, each of which is formed by a computer-readable program code and contained in a computer-readable medium. The terms "application" and "program" refer to one or more computer programs, software components, instruction sets, processes, functions, objects, classes, instances, related data or parts thereof suitable for implementation in a suitable computer-readable program code. The phrase "computer-readable program code" includes any type of computer code, including source code, object code and executable code. The phrase "computer-readable medium" includes any type of medium that can be accessed by a computer, such as a read-only memory (ROM), a random access memory (RAM), a hard drive, a compact disk (CD), a digital video disk (DVD) or any other type of memory. "Non-transitory" computer-readable media does not include wired, wireless, optical or other communication links that transmit temporary electrical signals or other signals. Non-transitory computer-readable media include media that can permanently store data and media that can store data and rewrite it later, such as rewritable optical disks or erasable storage devices.

[0036] Definitions for certain words and phrases are provided throughout this patent document, those of ordinary skill in the art should understand that in many, if not most instances, such definitions apply to prior, as well as future uses of such defined words and phrases.

[0037] Discussed below Figures 1 to 20 The various embodiments used to describe the principles of the present disclosure in this patent document are merely exemplary and should not be interpreted as limiting the scope of the present disclosure in any way. Those skilled in the art will appreciate that the principles of the present disclosure can be implemented in any appropriately arranged system or device.

[0038] The following description with reference to the accompanying drawings is provided to assist in a comprehensive understanding of the various embodiments of the present disclosure as defined by the claims and their equivalents. It includes various specific details that aid in understanding, but these are considered to be exemplary only. Therefore, it will be appreciated by those of ordinary skill in the art that various changes and modifications may be made to the various embodiments described herein without departing from the scope and spirit of the present disclosure. In addition, for the sake of clarity and conciseness, descriptions of well-known functions and structures may be omitted.

[0039] The terms and words used in the following description and claims are not limited to the bibliographical meanings, but are merely used by the inventor to enable a clear and consistent understanding of the present disclosure. Therefore, it will be apparent to those skilled in the art that the following description of various embodiments of the present disclosure is provided for illustrative purposes only and not for limiting the present disclosure as defined by the appended claims and their equivalents.

[0040] When describing the following disclosure, detailed descriptions of related known configurations or functions incorporated herein will be omitted when it is determined that detailed descriptions thereof may unnecessarily obscure the subject matter of the disclosure. Hereinafter, embodiments of the present disclosure will be described with reference to the accompanying drawings.

[0041] In the following description, for the convenience of description, terms for identifying access nodes, terms indicating network entities, terms indicating messages, terms indicating interfaces between network entities, terms indicating various identification information, etc. are used. Therefore, the present disclosure is not limited to the terms provided below, and other terms indicating subjects with equivalent technical meanings may be used.

[0042] For ease of description, the present disclosure uses terms and names defined in the Third Generation Partnership Project Long Term Evolution (3GPP LTE). However, the present disclosure is not limited to the terms and names and may be equally applied to systems conforming to other standards. For ease of description, evolved Node B (eNB) and "gNB" may be used interchangeably in the present disclosure. That is, a base station described as an eNB may indicate a gNB.

[0043] The present disclosure proposes a method for a terminal in RRC idle mode or RRC inactive mode in a next-generation mobile communication system to quickly report the results of measuring environmental frequencies to a base station, thereby allowing the base station to quickly configure carrier aggregation (CA) technology or dual connection (DC) technology to the terminal. Specifically, when the terminal releases the connection with the network, the base station can set configuration information for frequency measurement in an RRC message to the terminal, and the terminal has the ability to perform frequency measurement in RRC idle mode or RRC inactive mode. When moving in RRC idle mode or RRC inactive mode and performing a cell selection or reselection process, the terminal can perform frequency measurement based on the frequency measurement configuration information set in the RRC message or the system information of the serving cell where the terminal resides through the cell reselection process. In addition, the base station can quickly configure the CA technology or DC technology to the terminal by allowing the terminal to report the frequency measurement results immediately when establishing a connection with the network.

[0044] In the present disclosure, an RRC connection mode terminal may receive an RRC message (e.g., an RRC release message) from a base station and release the RRC connection. If the RRC message contains frequency measurement configuration information and an instruction to switch to an RRC idle mode or an RRC inactive mode, the terminal may perform frequency measurement in an RRC idle mode or an RRC inactive mode for a given duration or time. However, if there is no information about a frequency list to be measured in the frequency measurement configuration information set by the RRC message, and if the serving cell where the terminal is stationed through a cell selection or reselection process broadcasts frequency measurement configuration information for frequency measurement of an RRC idle mode or RRC inactive mode terminal, the terminal may perform frequency measurement by storing or considering the frequency measurement list based on the information.

[0045] As described above, the terminal can perform frequency measurement in RRC idle mode or RRC inactive mode. If it is necessary to establish an RRC connection with the network, and if there is an indicator indicating support for RRC idle mode or RRC inactive mode frequency measurement (early measurement) in the system information of the serving cell, or there is a valid measurement result in the terminal that satisfies the measurement result reporting condition set in the frequency measurement configuration information, the RRC idle mode or RRC inactive mode terminal can send an indicator to the base station via an RRC message (e.g., RRCSetupComplete message or RRCResumeComplete message), which indicates that there is a result of performing frequency measurement in RRC idle mode or RRC inactive mode. Upon receiving the indicator, the base station may send a request message (e.g., a new RRC message or a UEInformationRequest message) requesting the frequency measurement result to the terminal. Once the request message is received, the terminal may report the frequency measurement result to the base station as a response message (e.g., a new RRC message or a UEInformationResponse message). Therefore, based on the measurement result, the base station can quickly configure CA technology or DC technology to the terminal.

[0046] In another method, if the terminal performs frequency measurement in RRC inactive mode and needs to establish an RRC connection with the network, and if there is an indicator indicating support for RRC idle mode or RRC inactive mode frequency measurement (early measurement) in the system information of the serving cell, or there is a valid measurement result in the terminal that satisfies the measurement result reporting condition set in the frequency measurement configuration information, then when an RRC message (e.g., an RRC Resume message) containing an indicator requesting a frequency measurement result is received from the base station, the RRC inactive mode terminal can report the valid frequency measurement result as an RRC message to the base station. Therefore, based on the measurement result, the base station can quickly configure the CA technology or the DC technology to the terminal.

[0047] The present disclosure proposes what configuration information the base station should send to the terminal when setting RRC idle mode or RRC inactive mode frequency measurement configuration information to the terminal, and what configuration information the base station should send in the RRC message (e.g., RRC Release message) or system information for the battery saving and effective signaling of the terminal.

[0048] In addition, the present disclosure proposes how the terminal will perform frequency measurement on each frequency or cell when receiving RRC idle mode or RRC inactive mode frequency measurement configuration information through RRC message or system information in order to save the battery of the terminal, and how the terminal will apply the frequency measurement configuration information received through RRC message or system information when performing frequency measurement.

[0049] Figure 1 is a diagram showing the structure of a Long Term Evolution (LTE) system according to an embodiment of the present disclosure.

[0050] refer to Figure 1 As shown in the figure, the radio access network of the LTE system is configured with next generation base stations (evolved node B (ENB), node B or base station) 1-05, 1-10, 1-15 and 1-20, mobility management entity (MME) 1-25 and serving gateway (S-GW) 1-30. User equipment (UE) (or terminal) 1-35 can access external networks via ENB 1-05 to 1-20 and S-GW 1-30.

[0051] exist Figure 1 In the LTE system, ENB 1-05 to 1-20 may correspond to a conventional Node B in a Universal Mobile Telecommunications System (UMTS). The ENB is connected to the UE 1-35 through a wireless channel and performs a more complex role than a conventional Node B. In the LTE system, real-time services, such as Voice over IP (VoIP) over Internet Protocol, and all user traffic may be provided through a shared channel. Therefore, a device is required to perform scheduling by collecting status information of the UE, such as a buffer status, an available transmission power status, a channel status, etc., and the ENB 1-05 to 1-20 may be responsible for scheduling. One ENB typically controls multiple cells. In order to achieve a transmission rate of 100 Mbps, the LTE system uses Orthogonal Frequency Division Multiplexing (OFDM) as a wireless access technology with a bandwidth of 20 megahertz (MHz). In addition, an adaptive modulation and coding (AMC) scheme that determines a modulation scheme and a channel coding rate may be applied based on the channel status of the UE. The S-GW 1-30 is a device for providing a data bearer, and generates or removes a data bearer under the control of the MME 1-25. The MME is a device responsible for various control functions in addition to a mobility management function associated with the UE, and can be connected to a plurality of base stations.

[0052] Figure 2 is a diagram showing the structure of a radio protocol in an LTE system according to an embodiment of the present disclosure.

[0053] refer to Figure 2 For each of the UE and ENB, the radio protocol of the LTE system includes a packet data convergence protocol (PDCP) 2-05 and 2-40, a radio link control (RLC) 2-10 and 2-35, a medium access control (MAC) 2-15 and 2-30, and a physical layer (PHY) 2-20 and 2-25. PDCP 2-05 and 2-40 may be responsible for IP header compression / decompression, etc. The main functions of PDCP can be summarized as follows:

[0054] -Header compression and decompression: Strong Header Compression Only (ROHC)

[0055] -Transmission of user data

[0056] - In-sequence delivery (sequence delivery of upper layer packet data units (PDUs) during PDCP re-establishment procedure in Radio Link Control Acknowledged Mode (RLC AM))

[0057] - Reordering (Split bearer for DC (supports RLC AM only): PDCP PDU routing for transmission, PDCP PDU reordering for reception)

[0058] - Duplicate detection (duplicate detection of lower layer service data units (SDUs) during PDCP re-establishment for RLC AM)

[0059] - Retransmission (retransmission of PDCP SDUs at handover and, for split bearers of DC, retransmission of PDCP SDUs during PDCP data recovery for RLC AM)

[0060] -Encryption and decryption

[0061] -Timer-based SDU discard (Timer-based SDU discard in uplink)

[0062] RLC 2-10 and 2-35 can reconfigure PDCP PDU to the appropriate size and perform ARQ, etc. The main functions of RLC can be summarized as follows:

[0063] -Data transmission (transmission of upper layer PDU)

[0064] - Automatic Repeat Query (ARQ) (error correction via ARQ (only for AM data transmission))

[0065] - Concatenation, segmentation and reassembly (Concatenation, segmentation and reassembly of RLC SDU (only for unacknowledged mode (UM) and AM data transmission))

[0066] - Resegmentation (resegmentation of RLC data PDU (for AM data transmission only))

[0067] - Reordering (reordering of RLC data PDUs (only for UM and AM data transmission)

[0068] - Duplicate Detection (Duplicate Detection (for UM and AM data transmission only))

[0069] - Error detection (Protocol error detection (for AM data transmission only))

[0070] -RLC SDU discard (RLC SDU discard (only for UM and AM data transmission))

[0071] -RLC reconstruction

[0072] MAC 2-15 and 2-30 can be connected to various RLC layer devices configured for one UE, and can perform RLC PDU to MAC PDU multiplexing and RLC PDU to MAC PDU demultiplexing. The main functions of MAC can be summarized as follows:

[0073] - Mapping (mapping between logical channels and transport channels)

[0074] - Multiplexing and demultiplexing (multiplexing MAC SDUs belonging to one or more different logical channels into transport blocks (TBs) transmitted to the physical layer on a transport channel / demultiplexing transport blocks (TBs) transmitted from the physical layer on a transport channel into MAC SDUs belonging to one or more different logical channels)

[0075] -Dispatch information report

[0076] - Hybrid Automatic Repeat Request (HARQ) (error correction via HARQ)

[0077] - Priority handling between logical channels (priority handling between logical channels of a UE)

[0078] - Priority processing between UEs (priority processing between UEs is achieved through dynamic scheduling)

[0079] -Multimedia Broadcast / Multicast Service (MBMS) service identifier

[0080] -Transmission format selection

[0081] -filling

[0082] The physical (PHY) layers 2-20 and 2-25 may perform operations of channel coding and modulating higher layer data to generate OFDM symbols and transmit the OFDM symbols to a wireless channel, or operations of demodulating and channel decoding OFDM symbols received via a wireless channel and transmitting the demodulated and channel-decoded OFDM symbols to a higher layer.

[0083] Figure 3 is a diagram showing a structure of a next generation mobile communication system according to an embodiment of the present disclosure.

[0084] refer to Figure 3As shown in the figure, the wireless access network of the next generation mobile communication system (hereinafter referred to as NR or 5G) can be configured with a next generation base station (new radio node B (NR gNB or NR base station) 3-10 and a new radio core network (NR CN) 3-05. The user equipment (new radio user equipment (NR UE) or terminal) 3-15 can access the external network 3-35 via the NR gNB 3-10 and the NR CN 3-05.

[0085] exist Figure 3 In the present invention, the NR gNB 3-10 may correspond to the evolved Node B (eNB) in the conventional LTE system. The NR gNB is connected to the NR UE 3-15 through a wireless channel and may provide better services compared to the conventional Node B. In the next generation mobile communication system, all user services are served through a shared channel, and therefore, equipment is required to collect the status information of the UE (such as buffer status, available transmission power status, channel status, etc.) and perform scheduling, and the NR NB 3-10 is responsible for these. One NR gNB generally controls multiple cells. In order to achieve high-speed data transmission when compared with the currently used LTE, a bandwidth greater than or equal to the conventional maximum bandwidth may be required, and orthogonal frequency division multiplexing (OFDM) is used as a radio access technology, and beamforming technology is additionally used. In addition, an adaptive modulation and coding (AMC) scheme that determines the modulation scheme and channel coding rate may be applied based on the channel state of the UE. The NR CN 3-05 may support mobility, configure bearers, or configure quality of service (QoS). NR CN 3-05 is a device responsible for various control functions in addition to the mobility management function associated with UE 3-15, and can be connected to multiple base stations. In addition, the next generation mobile communication system can interoperate with the traditional LTE system, and NR CN 3-05 can be connected to MME 3-25 via a network interface. MME 3-25 can be connected to eNB 3-30 which is a traditional base station.

[0086] Figure 4 is a diagram showing a structure of a radio protocol in a next generation mobile communication system according to an embodiment of the present disclosure.

[0087] refer to Figure 4 The radio protocol of the next generation mobile communication system is configured with NR Service Data Adaptation Protocol (SDAP) 4-01 and 4-45, NR PDCP 4-05 and 4-40, NR RLC 4-10 and 4-35, and NR MAC 4-15 and 4-30 for each of the UE and the NR base station.

[0088] The main functions of NR SDAP 4-01 and 4-45 may include some of the following functions:

[0089] -Transmission of user data (transmission of user plane data)

[0090] - Mapping between QoS flows and data radio bearers (DRBs) for downlink (DL) and uplink (UL)

[0091] -Mark QoS flow identification (ID) for DL ​​and UL (mark QoS flow ID in DL and UL packets)

[0092] - Mapping of Reflective QoS Flows to DRBs for UL SDAP PDUs (Mapping of Reflective QoS Flows to DRBs for UL SDAP PDUs)

[0093] For each PDCP layer device, or for each bearer, or for each logical channel, the UE may receive a configuration associated with whether to use a header of an SDAP layer device or whether to use a function of an SDAP layer device via a radio resource control (RRC) message. When the SDAP header is configured, the UE is directed to update or reconfigure the mapping information between the data bearer and the QoS flow of the uplink and downlink through a one-bit non-access stratum (NAS) reflected QoS indicator (NAS reflected QoS) and a one-bit AS reflected QoS indicator (AS reflected QoS) of the SDAP header. The SDAP header may include QoS flow ID information indicating QoS. QoS information may be used as data processing priority to support smooth services, scheduling information, and the like.

[0094] The main functions of NR PDCP 4-05 and 4-40 may include some of the following functions:

[0095] -Header compression and decompression: ROHC only

[0096] -Transmission of user data

[0097] - In-order delivery (in-order delivery of upper layer PDUs)

[0098] - Out-of-order delivery (out-of-order delivery of upper layer PDUs)

[0099] - Reordering (for received PDCP PDU reordering)

[0100] - Duplicate detection (duplicate detection of lower layer SDU)

[0101] -Retransmission (retransmission of PDCP SDU)

[0102] -Encryption and decryption

[0103] -Timer-based SDU discard (Timer-based SDU discard in uplink)

[0104] The reordering function of NR PDCP 4-05 and 4-40 may indicate a function of reordering PDCP PDUs received sequentially from a lower layer according to a PDCP sequence number (SN). The reordering function may include a function of delivering the reordered data sequentially to a higher layer, may include a function of delivering the data immediately without regard to the sequence, may include a function of performing reordering and recording lost PDCP PDUs, may include a function of reporting the status of lost PDCP PDUs to the transmission side, and may include a function of requesting retransmission of lost PDCP PDUs.

[0105] The main functions of NR RLC 4-10 and 4-35 may include some of the following functions:

[0106] -Data transmission (transmission of upper layer PDU)

[0107] - In-order delivery (in-order delivery of upper layer PDUs)

[0108] - Out-of-order delivery (out-of-order delivery of upper layer PDUs)

[0109] -ARQ (error correction via ARQ)

[0110] - Concatenation, segmentation and reassembly (concatenation, segmentation and reassembly of RLC SDU)

[0111] - Re-segmentation (re-segmentation of RLC data PDU)

[0112] - Reordering (reordering of RLC data PDUs)

[0113] - Duplicate detection

[0114] - Error detection (protocol error detection)

[0115] -RLC SDU discarded

[0116] -RLC reconstruction

[0117] The in-sequence delivery function of the NR RLC device may indicate a function of sequentially delivering RLC SDUs received from a lower layer to a higher layer. The in-sequence delivery function may include a function of reassembling RLC SDUs segmented from an initial single RLC SDU and delivering the RLC SDUs, may include a function of reordering received RLC PDUs based on an RLC sequence number (SN) or a PDCP sequence number (SN), may include a function of performing reordering and recording lost RLC PDUs, may include a function of reporting the status of lost RLC PDUs to a transmission side, may include a function of requesting retransmission of lost RLC PDUs, may include a function of sequentially delivering only RLC SDUs preceding the lost RLC SDU to a higher layer if a lost RLC SDU exists, may include a function of sequentially delivering all RLC SDUs received before the start of the timer to a higher layer even if a lost RLC SDU exists if a timer expires, or may include a function of sequentially delivering all newly received RLC PDUs to a higher layer even if a lost RLC SDU exists if a predetermined timer expires. The RLC PDU may be processed in the order of arrival (regardless of sequence number) and may be delivered to the PDCP device randomly (out-of-order delivery). In the case of segmentation, a single RLC PDU is reconfigured by receiving segments stored in a buffer or to be received in the future, and the RLC PDU may be delivered to the PDCP device. The NR RLC layers 4-10 and 4-35 may not include a cascading function, and the function may be performed by the NR MAC layers 4-15 and 4-30, or may be replaced by a multiplexing function of the NR MAC layers 4-10 and 4-35.

[0118] The out-of-order delivery function of the NR RLC device may indicate a function of immediately delivering RLC SDUs received from a lower layer to a higher layer in any order. The out-of-order delivery function may include a function of reassembling RLC SDUs segmented from an original single RLC SDU and delivering the RLC SDUs, and may include a function of storing the RLC SN or PDCP SN of the received RLC PDU, performing reordering, and recording lost RLC PDUs.

[0119] The NR MAC layer 4-15 and 4-30 may be connected to multiple NR RLC layer devices configured for a single UE, and the main functions of the NR MAC layer 4-15 and 4-30 may include part of the following functions:

[0120] - Mapping (mapping between logical channels and transport channels)

[0121] -Multiplexing / demultiplexing (MAC SDU multiplexing / demultiplexing)

[0122] -Dispatch information report

[0123] -HARQ (error correction through HARQ)

[0124] - Priority handling between logical channels (priority handling between logical channels of a UE)

[0125] - Priority processing between UEs (priority processing between UEs is achieved through dynamic scheduling)

[0126] -MBMS service logo

[0127] -Transmission format selection

[0128] -filling

[0129] The NR PHY layers 4-20 and 4-25 may perform operations of channel coding and modulating higher layer data to generate OFDM symbols and transmit the OFDM symbols to a wireless channel, or operations of demodulating and channel decoding OFDM symbols received via a wireless channel and transmitting the demodulated and channel-decoded OFDM symbols to a higher layer.

[0130] In the next generation mobile communication system, the UE performs frequency measurement while performing a cell selection or reselection process in RRC idle mode or RRC inactive mode. The above-mentioned frequency measurement performed when performing the cell selection or reselection process may refer to intra-frequency measurement or serving cell or Pcell measurement of the frequency set by the gNB or broadcast in the resident cell. However, in addition to the intra-frequency measurement or serving cell measurement, inter-frequency measurement is not performed, and the result of the frequency measurement is not reported separately to the network. However, when the frequency measurement configuration information of the RRC idle mode or RRC inactive mode is set by the gNB in ​​an RRC message (e.g., RRCRelease message) or received through system information, or when the frequency measurement configuration information supporting the RRC idle mode or RRC inactive mode is indicated in the system information of the serving cell or the resident cell, the UE may also perform the inter-frequency measurement process. If the UE has stored a valid measurement result that meets the predetermined conditions, the UE can quickly report the frequency measurement result when establishing a connection with the network.

[0131] In addition, as described below, even in RRC connected mode, the UE can receive frequency measurement configuration information and perform a frequency measurement process. The frequency measurement configuration information for the RRC connected mode can be set only in an RRC message (e.g., an RRCReconfiguration message), while the frequency measurement configuration information for the RRC idle mode or the RRC inactive mode can be set to the UE through an RRC message (e.g., an RRCRelease message) or broadcast to the UE in the system information. In particular, in the case where the frequency measurement configuration information for the RRC idle mode or the RRC inactive mode is set through an RRC message (different from the information set in the system information), a duration value or a timer value specifying the duration for which the UE measures the frequency can be set, and area information of the area for which the UE measures the frequency (e.g., a cell identifier list information for each frequency) can be set.

[0132] In addition, as described below, even in the RRC connected mode, the UE may receive frequency measurement configuration information and perform a frequency measurement process. When the UE finds and camps on a suitable cell through a cell reselection process and then transitions to the RRC connected mode through an RRC connection establishment process, the gNB may set to the RRC connected mode UE which frequencies (e.g., a frequency list) or which frequency bands to be measured, which order to use for measurement by setting the priority of each frequency, which beam to be measured, which filtering method will be used to measure the frequency strength (e.g., L1, L2, or L3 filtering method, or which calculation method and which coefficient will be used for measurement), which event or condition will be used to start the frequency measurement, which criterion will be used for the frequency measurement compared with the current serving cell (or the current camped frequency), which event or condition will be applied to report the result of the frequency measurement, which criterion or condition needs to be met to report the frequency compared with the current serving cell (or the current camped frequency), or which period will be applied to report the frequency measurement result. The UE measures the frequency according to the frequency configuration set by the gNB as described above, and reports the frequency measurement result to the gNB according to the corresponding event or condition. Then, using the frequency measurement results received from the UE, the gNB can determine whether to apply CA or DC technology to the UE.

[0133] A method is disclosed herein, in a next generation mobile communication system, a UE performs frequency measurement in an RRC idle mode or an RRC inactive mode before transitioning to an RRC connected mode, the UE sends an indicator indicating the presence of a measurement result to a gNB when establishing a connection with a network, or the gNB requests the UE to report the measurement result, and then the UE enters the RRC connected mode and quickly reports the frequency measurement result. Therefore, based on the result measured by the UE in the RRC idle mode or the RRC inactive mode, the gNB can quickly configure a CA technology or a DC technology for the UE.

[0134] Specifically, when an RRC connected mode UE that establishes a connection with the network is converted to an RRC idle mode or an RRC inactive mode, the gNB may set frequency information (or multiple frequencies), time (or duration) information and / or area information (or cell list) for frequency measurement in the RRC idle mode or the RRC inactive mode to the UE through an RRC message, and may also instruct the UE to perform frequency measurement in the RRC idle mode or the RRC inactive mode. In addition, whenever moving, when performing a cell reselection operation, the UE may obtain system information of the new camping cell, and based on the system information, may perform a process of continuing or terminating frequency measurement, extending the measurement duration (e.g., restarting a timer), reporting frequency measurement results, discarding frequency measurement results, or updating frequency configuration information in the RRC idle mode or the RRC inactive mode.

[0135] In the present disclosure, a bearer may include a signaling radio bearer (SRB) and a data radio bearer (DRB). In addition, a UM DRB indicates a DRB operating in an unacknowledged mode (UM) using an RLC layer device, and an AM DRB indicates a DRB operating in an acknowledged mode (AM) using an RLC layer device.

[0136] Figure 5 The present invention is a diagram showing a process in which a terminal in a next generation mobile communication system switches from an RRC idle mode or an RRC inactive mode to an RRC connected mode and configures a carrier aggregation technology according to an embodiment of the present disclosure.

[0137] exist Figure 5 In the present invention, for a predetermined reason, a base station (hereinafter, gNB) may switch a terminal (hereinafter, UE) in RRC connected mode that has established a connection with the network to RRC idle mode or RRC inactive mode. The predetermined reason may be a lack of scheduling resources of the gNB or a suspension of data transmission / reception with the UE for a predetermined time.

[0138] The gNB may send an RRCRelease message to the UE, thereby instructing the UE to transition to the RRC idle mode or the RRC inactive mode (5-05). According to an embodiment, an indicator (suspend-config) included in the RRCRelease message may instruct the UE to transition to the RRC inactive mode, and if the indicator (suspend-config) is not included in the RRCRelease message, the UE may transition to the RRC idle mode.

[0139] When a network connection is required due to a predetermined reason, the UE transitioning to RRC idle mode or RRC inactive mode may perform a random access procedure, receive a random access response, request RRC connection establishment, receive an RRC message, and establish an RRC connection (5-10, 5-15, 5-20, 5-25, 5-30, 5-35, and 5-40).

[0140] The UE establishes reverse transmission synchronization with the gNB through a random access procedure and sends an RRCSetupRequest message (5-25) to the gNB. The RRCSetupRequest message may include the UE identifier, the reason for establishing the connection (establishmentCause), etc.

[0141] The gNB sends an RRCSetup message so that the UE can establish an RRC connection (5-30). The RRCSetup message may include at least one of configuration information of each logical channel, configuration information of each bearer, configuration information of the PDCP layer device, configuration information of the RLC layer device, and configuration information of the MAC layer device.

[0142] The RRCSetup message can assign a bearer identifier (e.g., an SRB identifier or a DRB identifier) ​​to each bearer and indicate the configuration of the PDCP layer device, RLC layer device, MAC layer device and / or PHY layer device of each bearer. In addition, the RRCConnectionSetup message can set the length of the PDCP sequence number used in the PDCP layer device for each bearer (e.g., 12 bits or 18 bits), and can set the length of the RLC sequence number used in the RLC layer device (e.g., 6 bits, 12 bits, or 18 bits). In addition, the RRCConnectionSetup message can indicate whether a header compression and decompression protocol is used for each PDCP layer device of each bearer in the uplink or downlink, and can indicate whether an integrity protection or verification process is performed. In addition, it can indicate whether out-of-order delivery is performed in the PDCP layer device.

[0143] The UE establishing the RRC connection sends an RRCSetupComplete message (5-40) to the gNB. The RRCSetupComplete message may contain a control message called SERVICE REQUEST, in which the UE requests bearer establishment for a given service from the AMF or MME. The gNB may send a SERVICE REQUEST message contained in the RRCSetupComplete message to the AMF or MME, which may determine whether to provide the service requested by the UE.

[0144] If it is determined that the UE requested service is provided, the AMF or MME sends a message called INITIAL CONTEXT SETUP REQUEST to the gNB. The initial context setup request message may contain information such as quality of service (QoS) information to be applied to set up the DRB and security related information (e.g., security keys, security algorithms) to be applied to the DRB.

[0145] The gNB sends and receives a SecurityModeCommand message and a SecurityModeComplete message to and from the UE in order to establish security, and when the security setup is completed, the gNB sends an RRCConnectionReconfiguration message (5-45) to the UE.

[0146] The RRCConnectionReconfiguration message may assign a bearer identifier (e.g., an SRB identifier or a DRB identifier) ​​to each bearer and indicate the configuration of the PDCP layer device, RLC layer device, MAC layer device, and / or PHY layer device of each bearer. In addition, the RRCConnectionReconfiguration message may set the length of the PDCP sequence number used in the PDCP layer device for each bearer (e.g., 12 bits or 18 bits), and may set the length of the RLC sequence number used in the RLC layer device (e.g., 6 bits, 12 bits, or 18 bits). In addition, the RRCConnectionSetup message may indicate whether a header compression and decompression protocol is used for each PDCP layer device of each bearer in the uplink or downlink, and may indicate whether an integrity protection or verification process is performed. In addition, it may indicate whether out-of-order delivery is performed in the PDCP layer device.

[0147] In addition, the RRCConnectionReconfiguration message may include configuration information of the DRB for which user data is to be processed, and the UE sets up the DRB by applying the above information and then sends an RRCConnectionReconfigurationComplete message to the gNB (5-50). The gNB that completes the DRB establishment with the UE may send an INITIALCONTEXT SETUP COMPLETE message to the AMF or MME, thereby completing the connection (5-50).

[0148] When the above process is completed, the UE sends and receives data to and from the gNB through the core network (5-55 and 5-60). According to some embodiments, the data transmission process mainly consists of three operations: RRC connection establishment, security establishment, and DRB establishment. In addition, for some reason, the gNB can send an RRCConnectionReconfiguration message to the UE in order to re-execute, add, or change the settings (5-65).

[0149] The RRCConnectionReconfiguration message may include frequency measurement configuration information (eg, a list of frequencies to be measured, duration of measuring frequencies, conditions for measuring frequencies, conditions for reporting frequencies after frequency measurement, cell identifiers for reporting frequencies, etc.).

[0150] The UE performs frequency measurement according to the frequency measurement configuration information, and when a predetermined condition is met (for example, if the signal strength of a specific frequency is better than a certain reference (for example, a threshold), or if the signal strength of the current serving cell (frequency) is less than a certain reference (for example, a threshold)), the result of the frequency measurement can be reported to the gNB (5-60).

[0151] When receiving the frequency measurement result, the gNB may insert the Scell ​​configuration information in the RRCReconfiguration message (5-65) based on the frequency measurement result and send it to the UE to configure the carrier aggregation (CA) technology to the UE. Alternatively, the gNB may insert the secondary cell group configuration information in the RRCReconfiguration message (5-65) and send it to the UE to configure the dual connectivity (DC) technology to the UE.

[0152] In case CA technology is configured for the UE, the gNB can transition the UE to active, inactive or idle state by using MAC control element (MAC CE).

[0153] The process of gNB configuring CA technology or DC technology to UE can be summarized as follows. First, the UE establishes a connection with the gNB, and the gNB sets the frequency measurement configuration information to the RRC connected mode UE. Then, the UE performs frequency measurement based on the frequency measurement configuration information and reports the frequency measurement result to the gNB. In addition, the gNB can set the configuration information of the additional Scell ​​as an RRC message to configure the CA technology to the UE based on the frequency measurement result of the UE, and can make these Scells active, idle or inactive through MAC CE. In addition, the gNB can set the secondary cell group configuration information based on the frequency measurement result of the UE to configure the DC technology to the UE.

[0154] As described above, when the gNB configures the CA technology or the DC technology to the UE, the UE needs to enter the RRC connection mode, receive the frequency measurement configuration information, perform the frequency measurement, and report the measurement result. Therefore, the measurement report is performed very late, so that the CA technology or the DC technology is configured very late. Therefore, in order to improve this problem, the present disclosure proposes a method for the UE to effectively perform the frequency measurement in the RRC idle mode or the RRC inactive mode, and report the frequency measurement result once the connection with the network is established.

[0155] Figure 6 is a diagram showing a first embodiment according to an embodiment of the present disclosure, which enables a terminal to perform early measurement in an RRC idle mode or an RRC inactive mode and make an early measurement report in a next generation mobile communication system.

[0156] In the first embodiment of the present disclosure, when the frequency measurement configuration information is set through the RRCRelease message or system information, the base station (gNB) can set multiple frequency measurement groups so that the terminal (UE) performs frequency measurement.

[0157] According to the first embodiment, the UE capable of performing frequency measurement and quickly reporting the frequency measurement result in the RRC idle mode or the RRC inactive mode may be a UE corresponding to one or more of the following situations.

[0158] 1. Any UE whose capability supports the method of performing early frequency measurement and early frequency measurement result reporting in RRC idle mode or RRC inactive mode.

[0159] 2. In RRC idle mode or RRC inactive mode UE, any UE that receives configuration information for indicating frequency measurement in RRC idle mode or RRC inactive mode when the gNB transitions the UE from RRC connected mode to RRC idle mode or RRC inactive mode through an RRC message. For example, any UE to which frequency configuration information, measurement duration (e.g., timer value), or area configuration information (e.g., cell identifier list) for frequency measurement is set in RRC idle mode or RRC inactive mode.

[0160] exist Figure 6In the embodiment of the present invention, a UE in RRC connected mode (6-05) may be converted by the gNB to RRC idle mode or RRC inactive mode (6-15) due to a predetermined reason (e.g., when there is no data transmission / reception for a certain time). When converting the mode of the UE, the gNB may send an RRC message (6-10). For example, the gNB may send an RRCRelease message including an indicator (suspend-config) instructing the UE to transition to RRC inactive mode, or may send an RRCRelease message without an indicator (suspend-config) to instruct the UE to transition to RRC idle mode. The above RRC message (e.g., RRCRelease message) may include first frequency configuration information to be applied when the UE performs early measurement in RRC idle mode or RRC inactive mode. The first frequency configuration information may have information about the frequency to be measured and a first timer value. The first timer value may indicate a duration or timer value (e.g., T331) for performing frequency measurement in RRC idle mode or RRC inactive mode. When the RRCRelease message instructs frequency measurement in RRC idle mode or RRC inactive mode, the UE may perform frequency measurement while the timer is running and may stop frequency measurement when the timer expires.

[0161] When the UE performs early measurement in the RRC idle mode or the RRC inactive mode, the condition for starting the frequency measurement may include at least one of the following conditions (6-30).

[0162] 1. If the received RRCRelease message contains an indicator to perform frequency measurement in RRC idle mode or RRC inactive mode, and if the frequency information to be measured and the duration for measuring the frequency (e.g., a timer value) are set, the UE can start the timer and perform frequency measurement according to the frequency information.

[0163] 2. If the received RRCRelease message includes an indicator for performing frequency measurement in RRC idle mode or RRC inactive mode, and if only the duration for measuring the frequency (e.g., a timer value) is set without frequency information, the UE may start the timer, perform a cell selection or reselection procedure, and obtain system information from the serving cell where the UE resides (6-12). The system information may include second frequency configuration information to be applied when the UE performs early measurement in RRC idle mode or RRC inactive mode. If the frequency information to be measured in RRC idle mode or RRC inactive mode is broadcast in the system information, the UE may perform frequency measurement based on the frequency information. If new second frequency configuration information for the UE to perform measurement in RRC idle mode or RRC inactive mode is broadcast in the system information of another cell to which the UE moves and newly resides, the UE may perform frequency measurement based on the new second frequency configuration information.

[0164] As described above, the UE can start and perform frequency measurement in RRC idle mode or RRC inactive mode. If the UE moves to and resides in a new cell and acquires system information, and if the acquired system information does not have an indicator indicating that frequency measurement is supported in RRC idle mode or RRC inactive mode, the UE can stop frequency measurement while still running the first timer. After moving to another cell, if the system information of the cell has an indicator that frequency measurement is supported in RRC idle mode or RRC inactive mode, and if the first timer is still running, the UE can restart frequency measurement by using the first frequency configuration information set in the RRCRelease message as suggested above or the second system information in the system information. In the system information, an indicator indicating LTE frequency measurement support and / or an indicator indicating NR frequency measurement support can be defined.

[0165] When one or more of the above conditions are met, the UE may start early measurement in RRC idle mode or RRC inactive mode. When performing frequency measurement, the RRC idle mode or RRC inactive mode UE stores valid measurement results that meet the predetermined conditions. Based on the configuration information set in the RRCRelease message or broadcast in the system information, the UE may determine whether the frequency measurement result that meets the predetermined conditions is valid.

[0166] In addition, when it is necessary to establish a connection with the network for data transmission and reception, the UE can send message 3 (e.g., RRCSetupRequest or RRCResumeRequest message) to the gNB while performing the random access process (6-35), recognize the success of the random access process by receiving message 4 (e.g., RRCSetup or RRCResume message) from the gNB (6-40), and switch to RRC connected mode (6-45).

[0167] If system information (e.g., SIB2) received before the UE establishes a connection in the current cell includes an indicator indicating that frequency measurement in RRC idle mode or RRC inactive mode is supported, or an indicator indicating that frequency measurement results in RRC idle mode or RRC inactive mode can be received, and if the UE has a valid frequency measurement result, the UE may send message 5 (e.g., RRCSetupComplete message or RRCesumeComplete message) to the gNB indicating that the UE has a frequency measurement result in RRC idle mode or RRC inactive mode.

[0168] For example, when the UE has a valid frequency measurement result that satisfies a predetermined condition, the UE may send a message 5 (e.g., RCSetupComplete or RRCResumeComplete) containing an indicator indicating that early measurements have been performed in RRC idle mode or RRC inactive mode and that there are frequency measurement results to be reported. For the indicator contained in message 5, a new indicator for indicating the presence of early frequency measurement results may be defined, or an indicator already defined in an RRC message (RCSetupComplete or RRCResumeComplete) may be reused to indicate that useful information exists in the UE (6-50). When message 5 indicates a frequency measurement result with RRC idle mode or RRC inactive mode, an indicator for a measurement result for an LTE frequency and an indicator for a measurement result for an NR frequency may be defined and indicated, respectively.

[0169] When it is identified from message 5 that the UE has performed early measurement in RRC idle mode or RRC inactive mode and there are measurement results to be reported, the gNB may send a message requesting a measurement result report to the UE in order to quickly receive the frequency measurement result (6-55). For example, the gNB may newly define a UEinformationRequest with a DL-DCCH message, and by using the message, request a frequency measurement result report from the UE. Upon receiving the message, the UE may report the early frequency measurement result to the gNB (6-65). For example, upon receiving the message, the UE may redefine a UEInformationResponse message with a UL-DCCH message, and by using the message, report the frequency measurement result. The frequency measurement result may include the measurement result of the serving cell / frequency (e.g., NR-SS RSRP / RSRQ), the measurement result of the neighboring cell / frequency around the serving cell / frequency, the measurement result of the neighboring cell / frequency that the UE can measure, the measurement result of the cell / frequency that is instructed to be measured, etc. Alternatively, the gNB may define an indicator in the RRCReconfiguration message, and request the frequency measurement result from the UE by using it. When receiving this message, the UE may report the early frequency measurement results to the gNB (6-65). For example, when receiving this message, the UE may report the frequency measurement results by using the RRCReconfigurationComplete message. Alternatively, the UE may define new fields for reporting frequency measurement results in the UL-DCCH message and use them.

[0170] Figure 7 is a diagram showing a second embodiment according to an embodiment of the present disclosure, which enables a terminal to perform early measurement in an RRC_IDLE mode or an RRC_INACTIVE mode and make an early measurement report in a next generation mobile communication system.

[0171] The above-mentioned first embodiment may be at least partially applied to the second embodiment of the present disclosure, and when the UE performs frequency measurement in RRC idle mode or RRC inactive mode, the gNB may use the RRCRelease message to set the first frequency measurement configuration information to be applied. Based on the first frequency configuration information or the second frequency configuration information of the system information, the UE may perform frequency measurement in RRC idle mode or RRC inactive mode. When the UE establishes a connection with the network for data transmission and reception, the gNB may send an RRC message (e.g., an RRCResume message) containing an indicator requesting a frequency measurement result to the UE. Upon receiving the indicator requesting a frequency measurement result and once having a valid frequency measurement result, the UE may construct an RRC message (e.g., an RRCResumeComplete message) with a valid frequency measurement result and send the message to the gNB to report the frequency measurement result.

[0172] exist Figure 7 In the present invention, when the RRC connected mode UE receives the first frequency measurement configuration information and the instruction to release the RRC connection and transition to the RRC idle mode or RRC inactive mode from the gNB, the UE may perform frequency measurement within the time or duration set above in the RRC idle mode or RRC inactive mode. In addition, when the second frequency measurement configuration information for frequency measurement of the RRC idle mode or RRC inactive mode UE is broadcast in the cell where the UE resides through the cell reselection process, the UE may receive the broadcasted information and perform frequency measurement.

[0173] When the UE attempts to reestablish a connection with the network in RRC idle mode or RRC inactive mode, and when the cell used for the connection supports reporting early frequency measurement results (e.g., when the system information has a relevant indicator), the UE may perform a random access procedure, send a message 3 (e.g., RRCResumeRequest), and receive a message 4 (e.g., RRCResume message) containing an indicator requesting reporting of frequency measurement results from the gNB (7-40). Upon receiving the indicator for reporting frequency measurement results, and upon having a valid frequency measurement result, the UE may construct an RRC message (e.g., RRCResumeComplete message) with the valid frequency measurement result and send the message to the gNB to report the frequency measurement result (7-50). Upon receiving the frequency measurement result, when sending an RRC message (e.g., RRCReconfiguration message) or MAC control information (MAC Control Element (MAC CE)) to the UE, the gNB may send CA technology configuration information or DC technology configuration information, thereby enabling the UE to quickly reactivate, change, or newly set the CA technology or DC technology (7-40). Therefore, the frequency measurement result report can be performed faster than the first embodiment.

[0174] At the same time, disclosed below are details of the first frequency configuration information set by the gNB in ​​the RRCRelease message and the second frequency configuration information broadcast in the system information, so that in the first or second embodiment, the UE can save battery and effectively perform the frequency measurement process in the RRC idle mode or the RRC inactive mode.

[0175] The first frequency configuration information set in the RRC message (for example, setting the RRC connected mode frequency measurement in the RRCReconfiguration message, setting the RRC idle mode or RRC inactive mode frequency measurement in the RRCRelease message) may include one or more of the following multiple configuration information types.

[0176] -First target frequency list for LTE frequency measurement

[0177] -First target SSB (Synchronization Signal Block) frequency list for NR frequency measurement

[0178] - List of target cells to be measured and reported for each frequency (including cell identifiers): When measuring a frequency, the UE can measure only the signals corresponding to the cell identifiers included in the cell list in the cells operating on that frequency. Then, if the given conditions are met, the UE can store the measurement results and report them to the network.

[0179] -Threshold information as a criterion to be measured and reported for each frequency: If a signal with a cell identifier included in the cell list is measured with a signal strength above the threshold, the UE may regard it as a valid measurement result, store it, and report the frequency measurement result when connecting to the network later.

[0180] -First configuration information for SSB measurement of each frequency: Auxiliary information that helps the UE to easily perform SSB measurement of each frequency can be set, and the auxiliary information may include one or more of the following multiple configuration information types.

[0181] ■SMTC (SSB Block Measurement Time Configuration) configuration information: Time configuration information for SSB frequency measurement, including the duration, offset or period of SSB transmission.

[0182] ■ssbSubcarrierSpacing configuration information: includes information about the frequency spacing of SSB measurements

[0183] ■ssb-ToMeasure configuration information: SSB identifier information measured between SSBs

[0184] ■nrofSS-BlocksToAverage: used to export parameter information of cell signal strength

[0185] ■absThreshSS-BlocksConsolidation: used to derive parameter information of cell signal strength

[0186] - A first method for reporting frequency measurements for each frequency (e.g., RSRP, RSRQ, beam measurement results, beam identifier, multiple beam measurement results, or multiple beam identifiers): The type of measurement results for each frequency or cell to be reported by the UE can be instructed. For example, it is possible to instruct to report RSRP or RSRQ, instruct to report beam measurement results, instruct to report a beam identifier with valid signal strength, or instruct to report multiple beam measurement results or multiple beam identifiers with valid signal strength. In addition, it is possible to instruct to report the measurement result or beam identifier of the beam with the best signal strength.

[0187] -First deriveSSB-IndexFromCell configuration information: If this indicator is set to true when performing intra-frequency measurement, it means that when deriving the SSB identifier of the SSB block in the smtc configuration information of other cells to be measured in the frequency, the timing of the current PCell or serving cell can be used as a reference (reference timing). Therefore, the UE can immediately know the SSB identifier of the frequency to be measured without reading the physical broadcast channel (PBCH), thereby saving the UE power consumed in the frequency measurement and enabling early measurement. If the indicator is set to false, the UE is required to synchronize with the cell of the frequency to be measured and derive each SSB identifier by reading the PBCH of the SSB block. In addition, if inter-frequency measurement needs to be performed due to the frequency to be measured, and if the indicator is set to true, it means that if any cell of the frequency to be measured is synchronized, the synchronized cell can be used as a reference timing when performing SSB measurement on other cells of the frequency, and it also means that the SSB identifier can be derived based on the timing. If the indicator is false, the UE can perform synchronization on each cell of the frequency and perform SSB measurement.

[0188] -First area configuration information: This is configuration information for an area in which the UE will perform frequency measurement in RRC idle mode or RRC inactive mode, and may contain, for example, a cell list (a list containing cell identifiers) for each frequency.

[0189] -First timer (e.g., valid timer) value or duration: This is a timer indicating the duration for which the UE will perform frequency measurement in RRC idle mode or RRC inactive mode. For example, when the first timer value or duration is set in the RRCRelease message, based on the frequency configuration information set in the first frequency configuration information or the second frequency configuration information, the UE starts the first timer and performs frequency measurement in the RRC idle mode or RRC inactive mode. When establishing a connection with the network, upon receiving the RRCSetup message or the RRCResume message from the gNB, the UE may regard it as a transition to the RRC connected mode, thereby stopping the first timer. In addition, when exceeding the first area (e.g., validity area), the UE may stop the first timer. If the first timer stops, the UE may release the frequency configuration information, stop the frequency measurement, and / or discard the frequency measurement result.

[0190] - Second timer value or duration: To confirm the validity of the frequency measurement result, the gNB may set a second timer value in the first frequency configuration information. The second timer may be used to indicate the duration for determining the validity of the frequency measurement result. The stored frequency measurement result value may be determined to be valid only when the second timer is running. If the second timer expires, the stored frequency measurement result value may be discarded and not reported to the gNB. In addition, a second timer may be driven for each UE, and the second timer may be started when the first timer indicating the frequency measurement duration expires or when the frequency measurement stops. When the second timer expires, the stored frequency measurement result may be determined to be no longer valid and thus discarded. The second timer may be stopped when the UE receives a request to report the frequency measurement result from the gNB or when the UE attempts to send the frequency measurement result to the gNB in ​​an RRC message while the second timer is running. In addition, a second timer may be driven for each frequency or cell, and a new timer may be started when the first timer indicating the frequency measurement duration expires or when the frequency measurement stops. In another method, whenever a frequency measurement is performed for each cell or frequency and then a new frequency measurement result is stored for each cell or frequency, a second timer corresponding to each cell or frequency may be started or restarted. In addition, when the second timer expires, the stored frequency measurement result of the cell or frequency for which the second timer is running may be determined to be no longer valid and discarded. In addition, when the UE receives a request to report the frequency measurement result from the gNB, or when the UE attempts to send the frequency measurement result to the gNB in ​​an RRC message while the second timer is running, the second timer may be stopped.

[0191] - Reference frequency or cell list for SSB measurement per frequency: This is configuration information of a frequency or cell synchronized with the current gNB or frequency as a timing reference when performing frequency measurement on a frequency or cell set in the frequency list for LTE frequency measurement or the synchronization signal block (SSB) frequency list for NR frequency measurement. When performing frequency measurement configuration, the UE can synchronize with one of the frequencies or cells set in the reference frequency or cell list and then perform frequency measurement on other frequencies.

[0192] The second frequency configuration information set in the system information proposed here may include one or more of the following multiple configuration information types: Different from the first frequency configuration information, the second frequency configuration information may not include the first timer configuration information, the first area configuration information or the second timer configuration information.

[0193] - A second target frequency list for LTE frequency measurement (a frequency list for frequency measurement of a UE in RRC idle mode or RRC inactive mode, or measurement configuration information for neighboring cells, or for determining other frequencies to camp on when the UE selects or reselects a cell)

[0194] - Second target SSB (synchronization signal block) frequency list for NR frequency measurement (a frequency list used for frequency measurement of UEs in RRC idle mode or RRC inactive mode, or measurement configuration information for neighboring cells, or for determining other frequencies to camp on when the UE selects or reselects a cell)

[0195] - List of target cells to be measured and reported for each frequency (including cell identifiers): When measuring a frequency, the UE can measure only the signals corresponding to the cell identifiers included in the cell list in the cells operating on that frequency. Then, if the given conditions are met, the UE can store the measurement results and report them to the network.

[0196] -Threshold information as a criterion to be measured and reported for each frequency: If a signal with a cell identifier included in the cell list is measured with a signal strength above the threshold, the UE may regard it as a valid measurement result, store it, and report the frequency measurement result when connecting to the network later.

[0197] -Second configuration information for SSB measurement of each frequency: Auxiliary information that helps the UE to easily perform SSB measurement of each frequency can be set, and the auxiliary information may include one or more of the following multiple configuration information types.

[0198] ■The second smtc (SSB block measurement time configuration) configuration information: time configuration information for SSB measurement of frequency, including duration, offset or period for sending SSB.

[0199] ■ssbSubcarrierSpacing configuration information: includes information about the frequency spacing of SSB measurements

[0200] ■ssb-ToMeasure configuration information: SSB identifier information measured between SSBs

[0201] ■nrofSS-BlocksToAverage: used to export parameter information of cell signal strength

[0202] ■absThreshSS-BlocksConsolidation: used to derive parameter information of cell signal strength

[0203] - A second method for reporting frequency measurements for each frequency (e.g., RSRP, RSRQ, beam measurement results, beam identifier, multiple beam measurement results, or multiple beam identifiers): The type of measurement results for each frequency or cell to be reported by the UE can be instructed. For example, it is possible to instruct to report RSRP or RSRQ, instruct to report beam measurement results, instruct to report a beam identifier with valid signal strength, or instruct to report multiple beam measurement results or multiple beam identifiers with valid signal strength. In addition, it is possible to instruct to report the measurement result or beam identifier of the beam with the best signal strength.

[0204] -Second deriveSSB-IndexFromCell configuration information: If this indicator is set to true when performing intra-frequency measurement, it means that when deriving the SSB identifier of the SSB block in the smtc configuration information of other cells to be measured in the frequency, the timing of the current PCell or serving cell can be used as a reference (reference timing). Therefore, the UE can immediately know the SSB identifier of the frequency to be measured without reading the physical broadcast channel (PBCH), thereby saving the UE power consumed in the frequency measurement and enabling early measurement. If the indicator is set to false, the UE is required to synchronize with the cell of the frequency to be measured and derive each SSB identifier by reading the PBCH of the SSB block. In addition, if inter-frequency measurement needs to be performed because of the frequency to be measured, and if the indicator is set to true, it means that if any cell of the frequency to be measured is synchronized, the synchronized cell can be used as a reference timing when performing SSB measurement on other cells of the frequency, and it also means that the SSB identifier can be derived based on the timing. If the indicator is false, the UE can perform synchronization on each cell of the frequency and perform SSB measurement.

[0205] Figure 8 is a diagram showing a signal structure when a terminal performs frequency measurement on an LTE frequency in an RRC idle mode or an RRC inactive mode according to an embodiment of the present disclosure.

[0206] The LTE frequency may indicate a frequency at which an LTE base station or an NR base station operates a cell having an LTE system, and the structure of a signal transmitted by the base station at the LTE frequency may be as follows: Figure 8 shown.

[0207] exist Figure 8In the present invention, the base station can send a signal with a system bandwidth (BW) 8-05 for the first LTE frequency 8-10, and the UE must read the signal according to the entire system bandwidth of the LTE frequency. The signal of the LTE frequency uses the subcarrier spacing defined for all or most frequencies except broadcast services or specific services (such as MBMS), and sends SSBs with the same period, duration or offset at predetermined frequency positions (for example, six physical resource blocks (PRBs) in the middle of the system bandwidth). The channel reference signal (CRS) 8-20 can be sent uniformly according to a predetermined rule.

[0208] A UE performing the RRC idle mode or RRC inactive mode frequency measurement proposed here can first read a signal with a predetermined system bandwidth of the LTE frequency when performing LTE frequency measurement, and then find the SSB signal at a predetermined position. In addition, because the SSB signal uses the subcarrier spacing defined for all or most frequencies and has the same periodicity, duration or offset, the UE can quickly synchronize and find the SSB signal. Then, based on the SSB signal, the UE can read the master information block (MIB) signal and perform frequency measurement by measuring the uniformly transmitted CRS signal. Because CRS is always uniformly transmitted on the LTE frequency, the UE has the advantage of quickly finding CRS transmission resources and performing early frequency measurements. Alternatively, the UE can measure the SSB signal of the LTE frequency and perform frequency measurement. Alternatively, an indicator set in the RRC Release message or system information indicates: in the case of LTE frequency, whether to measure the SSB signal or the CRS signal, and the UE can perform frequency measurement according to the indicator. In addition, when a predetermined condition set in the first frequency information or the second frequency information is met, the frequency measurement result can be reported based on a predetermined method.

[0209] Fig. 9 and Fig.10 2 are diagrams each showing a signal structure when a terminal performs frequency measurement of an NR frequency in an RRC idle mode or an RRC inactive mode according to an embodiment of the present disclosure.

[0210] The NR frequency may indicate a frequency in which an NR base station or an LTE base station operates a cell having an NR system, and the structure of a signal transmitted by the base station at the NR frequency may be as follows: Fig. 9 and 10 shown.

[0211] exist Fig. 9In the NR system, the base station may send a signal with a system bandwidth (BW) 9-05 for the first NR frequency 9-01, and the UE may not read the signal according to the entire system bandwidth of the NR frequency, but according to the partial bandwidth (BWP) 9-10 or 9-20. In the NR system, the system bandwidth of each frequency is very wide, so that if the UE reads all the system bandwidth, a large amount of battery consumption may occur, and the base station operates multiple partial bandwidths for each frequency. Therefore, the UE can read a signal with a specific partial bandwidth (e.g., an initial partial bandwidth) for each frequency, find the SSB to be synchronized, and measure the signal of the SSB. When operating the frequency, the base station may use different subcarrier spacing for each partial bandwidth or each frequency, and send SSBs with different periods, durations, or offsets at predetermined frequency positions (e.g., 12 PRBs in the middle of the partial bandwidth). In addition, unlike LTE frequencies, CRS 8-20 may not be sent. Because the base station operates multiple partial bandwidths for NR frequencies with very wide bandwidths, CRS transmission may bring huge overhead to the signal sent by the base station. For each of the multiple partial bandwidths, the SSB signal may be sent or not. However, for a specific portion of bandwidth (eg, an initial portion of bandwidth), an SSB signal is always transmitted so that an RRC idle mode or RRC inactive mode UE can synchronize the signal with the specific portion of bandwidth, acquire system information, and reside.

[0212] As described above, in NR frequency, different subcarrier spacings may be used for each frequency. In addition, because SSB signals with different periods, durations, or offsets are transmitted, the UE may need to search for the SSB signal for a long time to find the SSB signal for each frequency and find different periods, durations, or offsets. Therefore, the UE needs to calculate the period, duration, or offset of the SSB signal through complex derivation, and therefore, this process may cause a large amount of battery consumption of the UE.

[0213] Therefore, if Fig.10As shown, what is proposed in the present disclosure is that the smtc configuration information (or smtc configuration information or smtc information) of the frequency to be measured is set in the first frequency configuration information set using the RRC message or in the second frequency configuration information broadcast using the system information, so that the UE can easily perform frequency measurement. The smtc configuration information may include an offset 10-21, a duration 10-22 and / or a period 10-23 of the frequency to be measured, and the reference timing of these parameters 10-21, 10-22 and 10-23 included in the smtc configuration information may be based on the timing 10-05 of the PCell or the serving cell 10-01. For example, when the UE is configured to perform frequency measurement in the RRC connection, the UE can perform frequency measurement by applying the smtc information 10-21, 10-22 and 10-23 based on the timing (e.g., system frame number (SFN) 0) 10-05 of the current PCell 10-01. In another example, when the UE is configured to perform frequency measurement in RRC idle mode or RRC inactive mode, the UE may perform frequency measurement by applying smtc information 10-21, 10-22, and 10-23 based on the timing (e.g., SFN 0) 10-05 of the serving cell 10-01 in which the UE is currently residing.

[0214] In RRC connected mode, the detailed process of UE performing frequency measurement based on smtc information is as follows.

[0215] -When receiving first frequency configuration information with an RRC message from a base station in the RRC connected mode, the UE prepares to perform frequency measurement on a frequency or cell set in the first frequency configuration information.

[0216] -When attempting to measure a specific frequency in the above-mentioned frequency list, and when the smtc information of the frequency is contained, the UE applies the smtc information based on the timing of the PCell 10-01 with which the connection is currently established. That is, the UE can measure the SSB signal in the SSB signal transmission part by applying the offset 10-21 of the smtc information based on the SFN 0 of the current PCell 10-01 and also applying the duration 10-22 of the smtc information, and continuously measure the SSB signal at the time point of the next SSB signal transmission by applying the period 10-23 of the smtc information. Because the smtc information has been set for the frequency, the UE can immediately perform frequency measurement for the frequency based on the smtc information and the reference timing of the current PCell. Therefore, there is no need to synchronize the frequency, search for the SSB signal from the beginning, and derive the parameter values ​​of the periodicity, offset and duration, thereby reducing the battery consumption of the UE and achieving early frequency measurement.

[0217] In RRC idle mode or RRC inactive mode, the detailed process of UE performing frequency measurement based on smtc information is as follows.

[0218] -In RRC idle mode or RRC inactive mode, when receiving first frequency configuration information with an RRC message or second frequency configuration information with system information of a serving cell on which the UE resides through a cell selection or reselection procedure, the UE prepares to perform frequency measurement on a frequency or cell set in the first or second frequency configuration information.

[0219] -When attempting to measure a specific frequency in the above frequency list, and when the smtc information of the frequency is included, in RRC idle mode or RRC inactive mode, the UE applies the smtc information based on the timing of the serving cell 10-01 where the UE resides through the cell selection or reselection process. That is, the UE can measure the SSB signal in the SSB signal transmission part by applying the offset 10-21 of the smtc information based on the SFN 0 of the current serving cell 10-01 and also applying the duration 10-22 of the smtc information, and continuously measure the SSB signal at the time point of the next SSB signal transmission by applying the period 10-23 of the smtc information. Because the smtc information has been set for the frequency, the UE can immediately perform frequency measurement for the frequency based on the smtc information and the reference timing of the current serving cell. Therefore, there is no need to synchronize the frequency, search for the SSB signal from the beginning, and derive the parameter values ​​of the periodicity, offset and duration, thereby reducing the battery consumption of the UE and achieving early frequency measurement.

[0220] A UE that performs frequency measurement in RRC idle mode or RRC inactive mode is characterized in that, when performing measurement of the NR frequency, the SSB signal of a specific partial bandwidth (e.g., an initial partial bandwidth) of the NR frequency is first found. Because the SSB signal can use different subcarrier spacings and have different periods, durations, and / or offsets for different frequencies, the UE can continuously search for the SSB signal and derive parameter values ​​of the period, duration, and / or offset by calculation. Unlike measuring the CRS of the LTE frequency, for the NR frequency, the UE performs frequency measurement of the SSB signal based on the derived parameter values. In addition, when a predetermined condition set in the first or second frequency information is met, the UE can report the frequency measurement result by a predetermined method.

[0221] The method for performing frequency measurement proposed for an LTE frequency or an NR frequency may be extended and applied as a method for a UE to perform frequency measurement in an RRC idle mode, an RRC inactive mode, or an RRC connected mode.

[0222] Additionally, when attempting to perform frequency measurements, if the frequency to be measured is an LTE frequency, the UE may use Figure 8 The method proposed in performs frequency measurement, and if the frequency to be measured is an NR frequency, it can also be used Fig. 9 Or the method proposed in 10 performs frequency measurement.

[0223] Fig.11 is a diagram illustrating a method in which a terminal performs frequency measurement in an RRC idle mode or an RRC inactive mode in a network in which a terminal is synchronized between different frequencies or cells according to an embodiment of the present disclosure.

[0224] exist Fig.11 In the present invention, a UE sending / receiving data in RRC connected mode in the current cell 11-01 (first cell) can receive an RRCRelease message from the base station of the current cell 11-01, switch to RRC idle mode or RRC inactive mode, and move while performing a cell selection or reselection process. The RRCRelease message may include first frequency configuration information. In addition, an RRC idle mode or RRC inactive mode UE can reside on a suitable cell through a cell selection or reselection process and obtain system information. The UE can receive second frequency configuration information in the system information.

[0225] If the received RRCRelease message includes the first frequency configuration information, the UE can drive the timer by applying the first timer value information of the first frequency configuration information, and start the early frequency measurement of the RRC idle mode or the RRC inactive mode. In addition, if the first frequency configuration information includes the first area configuration information, the UE can identify the identifier of the camped cell and determine whether to perform the early frequency measurement of the RRC idle mode or the RRC inactive mode.

[0226] If the UE is in the service area of ​​the first cell 11-01, the UE can perform early frequency measurement of the RRC idle mode or RRC inactive mode based on the first frequency configuration information received in the RRCRelease message or the second frequency configuration information broadcasted by the first cell 11-01 as system information. That is, when the UE attempts to measure the first frequency 11-10 in the above-mentioned frequency list, and when the first frequency configuration information received from the first cell contains the first smtc configuration information or the second frequency configuration information received in the system information of the first cell contains the second smtc configuration information, in the RRC idle mode or RRC inactive mode, the UE applies such smtc configuration information based on the timing of the serving cell (i.e., the first cell) 11-01 on which the UE resides through the cell selection or reselection process. That is, the UE can measure the SSB signal in the SSB signal transmission part by applying the offset of the smtc information based on the SFN 0 of the current serving cell 11-01 and also applying the duration of the smtc information, and continuously measure the SSB signal at the time point of the next SSB signal transmission by applying the periodicity of the smtc information. Because the SMTC information has been set for the frequency, the UE can immediately perform frequency measurement for the frequency based on the SMTC information and the reference timing of the current serving cell. Therefore, there is no need to synchronize the frequency, search for the SSB signal from the beginning, and derive parameter values ​​of periodicity, offset and duration, thereby reducing the battery consumption of the UE and achieving early frequency measurement. If the SMTC configuration information is not included for the frequency, the UE may not perform RRC idle mode or RRC inactive mode frequency measurement on the frequency to reduce battery consumption. Optionally, even when there is no SMTC configuration information, the UE can perform RRC idle mode or RRC inactive mode frequency measurement by being implemented as a synchronized frequency, searching for the SSB signal from the beginning, and deriving parameter values ​​of periodicity, offset and duration.

[0227] If the UE moves from the first cell 11-01 to the service area of ​​the second cell 11-02 and resides on the second cell 11-02, the UE can perform RRC idle mode or RRC inactive mode frequency measurement based on the first frequency configuration information received in the RRCRelease message or the second frequency configuration information broadcast by the second cell 11-02 as system information. That is, when the UE attempts to measure the second frequency 11-20 in the above-mentioned frequency list, and when the first frequency configuration information received from the first cell contains the first smtc configuration information or the second frequency configuration information received in the system information of the second cell contains the second smtc configuration information, the UE in RRC idle mode or RRC inactive mode applies such smtc configuration information based on the timing of the serving cell (i.e., the second cell) 11-02 on which the UE resides through the cell selection or reselection process. That is, the UE can measure the SSB signal in the SSB signal transmission part by applying the offset of the smtc information based on the SFN 0 of the current serving cell 11-02 and also applying the duration of the smtc information, and continuously measure the SSB signal at the time point of the next SSB signal transmission by applying the periodicity of the smtc information. Because the smtc information has been set for the frequency, the UE can immediately perform frequency measurement for the frequency based on the smtc information and the reference timing of the current serving cell. Therefore, there is no need to synchronize the frequency, search for the SSB signal from the beginning, and derive the parameter values ​​of the periodicity, offset and duration, so that the battery consumption of the UE can be reduced and early frequency measurement can be achieved. If the frequency does not contain the smtc configuration information, the UE may not perform RRC idle mode or RRC inactive mode frequency measurement on the frequency to reduce battery consumption. Optionally, even when there is no smtc configuration information, the UE can perform RRC idle mode or RRC inactive mode frequency measurement by being implemented as a synchronized frequency, searching for the SSB signal from the beginning, and deriving the parameter values ​​of the periodicity, offset and duration.

[0228] Fig.12 is a diagram illustrating a problem occurring when a terminal performs frequency measurement in an RRC idle mode or an RRC inactive mode in a network in which different frequencies or cells are not synchronized according to an embodiment of the present disclosure.

[0229] exist Fig.12In the present invention, a UE sending / receiving data in RRC connected mode in the current cell 12-01 (first cell) can receive an RRCRelease message from the base station of the current cell 12-01, switch to RRC idle mode or RRC inactive mode, and move while performing a cell selection or reselection process. The RRCRelease message may include first frequency configuration information. In addition, the RRC idle mode or RRC inactive mode UE can reside on a suitable cell through a cell selection or reselection process and obtain system information. The UE can receive the second frequency configuration information in the system information.

[0230] If the received RRCRelease message includes the first frequency configuration information, the UE can drive the timer by applying the first timer value information of the first frequency configuration information, and start the early frequency measurement of the RRC idle mode or the RRC inactive mode. In addition, if the first frequency configuration information includes the first area configuration information, the UE can identify the identifier of the camped cell and determine whether to perform the early frequency measurement of the RRC idle mode or the RRC inactive mode.

[0231] If the UE is in the service area of ​​the first cell 12-01, the UE can perform early frequency measurement of the RRC idle mode or RRC inactive mode based on the first frequency configuration information received in the RRCRelease message or the second frequency configuration information broadcasted by the first cell 12-01 as system information. That is, when the UE attempts to measure the first frequency 12-10 in the above-mentioned frequency list, and when the first frequency configuration information received from the first cell contains the first smtc configuration information or the second frequency configuration information received in the system information of the first cell contains the second smtc configuration information, the UE applies such smtc configuration information in the RRC idle mode or RRC inactive mode based on the timing of the serving cell (i.e., the first cell) 12-01 on which the UE resides through the cell selection or reselection process. That is, the UE can measure the SSB signal in the SSB signal transmission part by applying the offset of the smtc information based on the SFN 0 of the current serving cell 12-01 and also applying the duration of the smtc information, and continuously measure the SSB signal at the time point of the next SSB signal transmission by applying the periodicity of the smtc information. Because the SMTC information has been set for the frequency, the UE can immediately perform frequency measurement for the frequency based on the SMTC information and the reference timing of the current serving cell. Therefore, there is no need to synchronize the frequency, search for the SSB signal from the beginning, and derive parameter values ​​of periodicity, offset and duration, thereby reducing the battery consumption of the UE and achieving early frequency measurement. If the frequency does not contain the SMTC configuration information, the UE may not perform RRC idle mode or RRC inactive mode frequency measurement on the frequency to reduce battery consumption. Optionally, even when there is no SMTC configuration information, the UE can perform RRC idle mode or RRC inactive mode frequency measurement by being implemented as a synchronized frequency, searching for the SSB signal from the beginning, and deriving parameter values ​​of periodicity, offset and duration.

[0232] If the UE moves from the first cell 12-01 to the service area of ​​the second cell 12-02 and resides on the second cell 12-02, the UE can perform RRC idle mode or RRC inactive mode frequency measurement based on the first frequency configuration information received in the RRC Release message or the second frequency configuration information broadcasted by the second cell 12-02 as system information. That is, when the UE attempts to measure the second frequency 12-20 in the above-mentioned frequency list, and when the first frequency configuration information received from the first cell contains the first SMT configuration information or the second frequency configuration information received in the system information of the second cell contains the second SMT configuration information, the UE applies such SMT configuration information in the RRC idle mode or RRC inactive mode based on the timing of the serving cell (i.e., the second cell) 12-02 in which the UE resides through the cell selection or reselection process. That is, the UE can measure the SSB signal in the SSB signal sending part by applying the offset of the smtc information based on SFN 0 of the current serving cell 12-02 and also applying the duration of the smtc information, and continuously measure the SSB signal at the time point of the next SSB signal transmission by applying the periodicity of the smtc information.

[0233] However, in Fig.12 , the time synchronization between the first cell 12-01 and the second cell 12-02 does not match. Therefore, when measuring the second frequency 12-20 in the second cell, if the first SMTC information of the second frequency 12-20 contained in the first frequency configuration information received in the RRCRelease message of the first cell is applied, a problem may occur that the frequency measurement cannot be performed due to asynchronous timing. This is because the first SMTC information of the second frequency 12-20 contained in the first frequency configuration information received in the RRCRelease message of the first cell is information set based on the reference timing of the first cell. If the UE applies the first SMTC information in the area of ​​the second cell based on the reference timing of the second cell, part of the frequency measurement will not match like the gap between the timing of the first cell and the timing of the second cell. Therefore, for the second frequency, the UE may not perform RRC idle mode or RRC inactive mode frequency measurement normally.

[0234] The following describes a method for efficient RRC idle mode or RRC inactive mode frequency measurement, which can solve the problem of Fig.12 The above-mentioned problem of frequency measurement failure caused by asynchronous timing in the UE is solved, and the battery consumption of the UE is minimized.

[0235] Fig.13 is a diagram showing a first embodiment of an effective frequency measurement method in an RRC idle mode or an RRC inactive mode according to an embodiment of the present disclosure.

[0236] exist Fig.13 In the present invention, the base station or cell can set the configuration information for RRC idle mode or RRC inactive mode frequency measurement to the UE by using the first frequency measurement configuration information 13-10 in the RRCRelease message or the second frequency measurement configuration information 13-20 in the system information.

[0237] If the received RRCRelease message includes the first frequency configuration information, the UE may drive the timer by applying the first timer value information of the first frequency configuration information, and start RRC idle mode or RRC inactive mode frequency measurement (i.e., early measurement). In addition, if the first frequency configuration information includes the first area configuration information, the UE may identify the identifier of the cell where the UE resides through the cell selection or reselection process, and may determine whether to perform early frequency measurement of RRC idle mode or RRC inactive mode. If the first frequency configuration information does not include the first frequency list information to be measured, and if the second frequency configuration is broadcast in the system information of the resident cell, the UE may perform RRC idle mode or RRC inactive mode frequency measurement based on the second frequency configuration information (e.g., the second frequency list information), store the valid measurement results, and when an RRC connection is established later, such as Figure 6 Or as described in 7, reporting the stored measurement results to the network.

[0238] exist Fig.13 In the first embodiment of the efficient RRC idle mode or RRC inactive mode frequency measurement method shown, the UE can receive the first frequency configuration information through the RRCRelease message, switch to the RRC idle mode or RRC inactive mode, and perform frequency measurement. In addition, the UE can receive the second frequency configuration information through the system information of the cell where the UE resides through the cell selection or reselection process.

[0239] The first embodiment is characterized in that the UE receives the first frequency configuration information and / or the second frequency configuration information, gives priority to the first frequency configuration information when performing RRC idle mode or RRC inactive mode frequency measurement, and performs frequency measurement only based on the first frequency configuration information. In addition, the UE may perform frequency measurement considering the second frequency configuration information relative to the configuration information not included in the first frequency configuration information.

[0240] For example, the UE may receive first frequency configuration information in an RRCRelease message 13-10 from a first cell, switch to an RRC idle mode or an RRC inactive mode, and then receive second frequency configuration information in system information 13-20 from the first cell or a new second cell through a cell selection or reselection process.

[0241] The first frequency list of the first frequency configuration information 13-10 may include frequency 1 (13-01), frequency 2 (13-02), frequency 3 (13-03), frequency 4 (13-04), frequency 5 (13-05), and frequency 6 (13-06) as target frequencies to be measured. Among these frequencies, only frequency 1 (13-01), frequency 2 (13-02), frequency 3 (13-03), and frequency 5 (13-05) may be configured with threshold information used as a standard for measurement and reporting of each frequency, first configuration information for SSB measurement of each frequency, or a first reporting method for measurement reporting of each frequency.

[0242] The second frequency list of the second frequency configuration information 13-20 may include frequency 3 (13-03), frequency 4 (13-04), frequency 5 (13-05), frequency 6 (13-06), frequency 7 (13-07), and frequency 8 (13-08) as target frequencies to be measured. Among these frequencies, only frequency 3 (13-03), frequency 4 (13-04), frequency 7 (13-07), and frequency 8 (13-08) may be configured with threshold information used as a standard for measurement and reporting of each frequency, second configuration information for SSB measurement of each frequency, or a second reporting method for measurement reporting of each frequency.

[0243] When receiving the first frequency configuration information 13-10 or the second frequency configuration information 13-20, the UE may select a frequency to be measured and then apply one of the following methods to determine the frequency configuration to be applied to each frequency.

[0244] -Method 1-1 (13-51): The UE gives priority to the first frequency configuration information 13-10 to perform frequency measurement. Therefore, the UE can perform frequency measurement only on the frequencies 13-51 (i.e., frequency 1 (13-01), frequency 2 (13-02), frequency 3 (13-03), frequency 4 (13-04), frequency 5 (13-05), and frequency 6 (13-06)) set in the first frequency list by applying the frequency measurement configuration information of each frequency set in the first frequency configuration information 13-10 (e.g., threshold information used as a criterion for measurement and reporting of each frequency, first configuration information for SSB measurement of each frequency, or a first reporting method for measurement reporting of each frequency), determine a valid frequency measurement result, construct the result to be reported, and store the constructed result. Specifically, in method 1-1, based on the reference timing of the serving cell where the UE resides through the cell selection or reselection process, the UE can perform frequency measurement by applying the first configuration information (e.g., periodicity, offset, and / or duration of smtc) for SSB measurement of each frequency. If there is no first configuration information for SSB measurement for the target frequency to be measured, the UE may not perform measurement of the frequency to reduce battery consumption. In an alternative method, even when there is no first configuration information for SSB measurement of the frequency (e.g., periodicity, offset and / or duration of smtc), the UE may perform RRC idle mode or RRC inactive mode frequency measurement by being implemented as a synchronized frequency, searching for SSB signals from the beginning, and deriving parameter values ​​of periodicity, offset and duration. In another alternative method, the UE may store the reference timing of the cell from which the RRC Release message is received, and based on the stored timing, perform measurement by applying the first configuration information to the SSB measurement of each frequency. In this method 1-1, the UE performs frequency measurement only based on the first frequency configuration information, so that there is no need to read a large amount of system information, thereby reducing the battery consumption of the UE.

[0245] -Method 1-2 (13-52): The UE prioritizes the first frequency configuration information 13-10 to perform frequency measurement. Therefore, the UE can perform frequency measurement only on the frequencies 13-52 (i.e., frequency 1 (13-01), frequency 2 (13-02), frequency 3 (13-03), frequency 4 (13-04), frequency 5 (13-05), and frequency 6 (13-06)) set in the first frequency list by applying the frequency measurement configuration information of each frequency (e.g., threshold information used as a criterion for measurement and reporting of each frequency, first configuration information for SSB measurement of each frequency, or a first reporting method for measurement reporting of each frequency), determine a valid frequency measurement result, construct the result to be reported, and store the constructed result. Specifically, in method 1-2, based on the reference timing of the serving cell where the UE resides through the cell selection or reselection process, the UE can perform frequency measurement by applying the first configuration information (e.g., periodicity, offset and / or duration of smtc) for SSB measurement of each frequency. If there is no first configuration information for SSB measurement of a target frequency to be measured (e.g., frequency 4 (13-04)), but if the second frequency configuration information received in the system information contains second configuration information for SSB measurement of the frequency, the UE may perform frequency measurement by applying the second configuration information for SSB measurement of the frequency (e.g., frequency 4 (13-04)) (e.g., periodicity, offset and / or duration of smtc) based on the reference timing of the serving cell where the UE resides through the cell selection or reselection process. If there is neither the first configuration information nor the second configuration information for SSB measurement of the target frequency to be measured, the UE may not perform measurement of the frequency to reduce battery consumption. In an alternative method, even if there is no first configuration information for SSB measurement of each frequency, or even if there is no second configuration information for SSB measurement of each frequency, the UE may perform RRC idle mode or RRC inactive mode frequency measurement by being implemented as a synchronized frequency, searching for SSB signals from the beginning, and deriving parameter values ​​of periodicity, offset and duration. In another alternative method, the UE may store the reference timing of the cell from which the RRCRelease message is received, and perform measurement by applying the first configuration information or the second configuration information to the SSB measurement of each frequency based on the stored timing.

[0246] A variation of the first embodiment of the efficient RRC idle mode or RRC inactive mode frequency measurement method is as follows.

[0247] exist Fig.13In the present invention, the base station or cell can set the configuration information for RRC idle mode or RRC inactive mode frequency measurement to the UE by using the first frequency measurement configuration information 13-10 in the RRCRelease message or the second frequency measurement configuration information 13-20 in the system information.

[0248] If the received RRCRelease message includes the first frequency configuration information, the UE may drive the timer by applying the first timer value information of the first frequency configuration information, and start RRC idle mode or RRC inactive mode frequency measurement (i.e., early measurement). In addition, if the first frequency configuration information includes the first area configuration information, the UE may identify the identifier of the cell where the UE resides through the cell selection or reselection process, and may determine whether to perform early frequency measurement of RRC idle mode or RRC inactive mode. If the first frequency configuration information does not include the first frequency list information to be measured, and if the second frequency configuration is broadcast in the system information of the resident cell, the UE may perform RRC idle mode or RRC inactive mode frequency measurement based on the second frequency configuration information (e.g., the second frequency list information), store the valid measurement results, and when an RRC connection is established later, such as Figure 6 Or as described in 7, reporting the stored measurement results to the network.

[0249] In a variation of the first embodiment of the method for efficient RRC idle mode or RRC inactive mode frequency measurement, the UE may receive first frequency configuration information through an RRCRelease message, switch to RRC idle mode or RRC inactive mode, and perform frequency measurement. In addition, the UE may receive second frequency configuration information through system information of a cell where the UE resides through a cell selection or reselection process.

[0250] A variant of the first embodiment is characterized in that the UE receives the first frequency configuration information and / or the second frequency configuration information, and is characterized in that, when performing RRC idle mode or RRC inactive mode frequency measurement, in the case of receiving the first frequency configuration information and the second frequency configuration information, the UE always gives priority to the first frequency list information rather than the second frequency list information, but in the case of receiving the first configuration information for SSB measurement for each frequency and the second configuration information for SSB measurement for each frequency, the second configuration information for SSB measurement for each frequency is given priority. However, if the cell from which the UE receives the system information is the same as the cell from which the UE receives the RRCRelease message, and if for a specific frequency in the first frequency list, the UE receives the first configuration information for SSB measurement through the RRCRelease message and receives the second configuration information for SSB measurement through the system information of the same cell, the UE can apply the first configuration information for SSB measurement for each frequency in the first frequency list. This is because if different types of information are received from the same cell through the RRCRelease message and the system information, the UE should give priority to the specific information (dedicated to the UE) provided directly by the base station. In the case of certain UEs that do not have much mobility and continuously reside in the same cell, the first configuration information for SSB measurement of each frequency may be more effective for frequency measurement for CA technology or DC technology.

[0251] If the RRCRelease message includes only the first frequency list but does not include the first configuration information for SSB measurement of each frequency, and if the second configuration information for SSB measurement of each frequency included in the first frequency list is broadcast through system information, the UE can perform frequency measurement by applying the second configuration information for SSB measurement of each frequency to the frequencies of the first frequency list.

[0252] For example, the UE may receive first frequency configuration information in an RRCRelease message 13-10 from a first cell, switch to an RRC idle mode or an RRC inactive mode, and then receive second frequency configuration information in system information 13-20 from the first cell or a new second cell through a cell selection or reselection process.

[0253] The first frequency list of the first frequency configuration information 13-10 may include frequency 1 (13-01), frequency 2 (13-02), frequency 3 (13-03), frequency 4 (13-04), frequency 5 (13-05), and frequency 6 (13-06) as target frequencies to be measured. Among these frequencies, only frequency 1 (13-01), frequency 2 (13-02), frequency 3 (13-03), and frequency 5 (13-05) may be configured with threshold information used as a standard for measurement and reporting of each frequency, first configuration information for SSB measurement of each frequency, or a first reporting method for measurement reporting of each frequency.

[0254] The second frequency list of the second frequency configuration information 13-20 may include frequency 3 (13-03), frequency 4 (13-04), frequency 5 (13-05), frequency 6 (13-06), frequency 7 (13-07), and frequency 8 (13-08) as target frequencies to be measured. Among these frequencies, only frequency 3 (13-03), frequency 4 (13-04), frequency 7 (13-07), and frequency 8 (13-08) may be configured with threshold information used as a standard for measurement and reporting of each frequency, second configuration information for SSB measurement of each frequency, or a second reporting method for measurement reporting of each frequency.

[0255] When receiving the first frequency configuration information 13-10 or the second frequency configuration information 13-20, the UE may select a frequency to be measured and then apply one of the following methods to determine the frequency configuration to be applied to each frequency.

[0256] -Method 1-1-1 (13-51):

[0257] ■1> If the UE moves within the first cell from which it has received the RRCRelease message, and camps on the same first cell again (13-52),

[0258] ◆2> The UE prioritizes the first frequency configuration information 13-10 for frequency measurement. Therefore, the UE can perform frequency measurement on the frequencies 13-51 (i.e., frequency 1 (13-01), frequency 2 (13-02), frequency 3 (13-03), frequency 4 (13-04), frequency 5 (13-05), and frequency 6 (13-06)) set in the first frequency list by applying the frequency measurement configuration information of each frequency (for example, threshold information used as a standard for measurement and reporting of each frequency, the first configuration information for SSB measurement of each frequency, or the first reporting method for measurement reporting of each frequency), determine the valid frequency measurement results, construct the results to be reported, and store the constructed results. That is, even if the second configuration information for SSB measurement of each frequency corresponding to the first frequency list is broadcast in the system information, the UE can prioritize the information of the RRCRelease message because the RRCRelease message is received from the same cell. Specifically, in method 1-1-1, based on the reference timing of the serving cell where the UE resides through the cell selection or reselection process, the UE can perform frequency measurement by applying the first configuration information (e.g., the periodicity, offset and / or duration of the smtc) to the SSB measurement of the target frequency to be measured (e.g., frequency 4 (13-04)). In an alternative method, the UE may store the reference timing of the cell from which the RRC Release message is received, and based on the stored timing, perform measurement by applying the first configuration information or the second configuration information to the SSB measurement of each frequency. If there is neither the first configuration information nor the second configuration information for SSB measurement for the target frequency to be measured, the UE may not perform measurement of the frequency to reduce battery consumption. In another alternative method, even if there is no first configuration information for SSB measurement of each frequency, or even if there is no second configuration information for SSB measurement of each frequency, the UE can perform RRC idle mode or RRC inactive mode frequency measurement by being implemented as a synchronized frequency, searching for SSB signals from the beginning, and deriving parameter values ​​of periodicity, offset and duration. In yet another alternative method, if there is no first configuration information for SSB measurement of the target frequency to be measured (e.g., frequency 4 (13-04)), but if the second frequency configuration information received in the system information contains second configuration information for SSB measurement of the frequency, the UE can perform frequency measurement by applying the second configuration information for SSB measurement of the frequency (e.g., the periodicity, offset and / or duration of smtc) to the SSB measurement of the frequency based on the reference timing of the serving cell where the UE resides through the cell selection or reselection process.

[0259] ◆2> If the first frequency configuration information received in the RRCRelease message does not include the configuration information of the first frequency list, the UE can apply method 2-1 (14-51) to be described below. Specifically, the UE gives priority to the second frequency configuration information 14-20 to perform frequency measurement. Therefore, the UE can perform frequency measurement only on the frequencies 14-51 set in the second frequency list (i.e., frequency 3 (14-03), frequency 4 (14-04), frequency 5 (14-05), frequency 6 (14-06), frequency 7 (14-07), and frequency 8 (14-08)) by applying the frequency measurement configuration information of each frequency (for example, threshold information used as a standard for measurement and reporting of each frequency, second configuration information for SSB measurement of each frequency, or a second reporting method for measurement reporting of each frequency), determine the valid frequency measurement results, construct the results to be reported, and store the constructed results. Specifically, in method 2-1, based on the reference timing of the serving cell where the UE resides through a cell selection or reselection process, the UE can perform frequency measurement by applying the second configuration information (e.g., the periodicity, offset and / or duration of the smtc) to the SSB measurement of the target frequency to be measured. If there is no second configuration information for SSB measurement for the target frequency to be measured, the UE may not perform measurement of the frequency to reduce battery consumption. In an alternative method, even when there is no second configuration information for SSB measurement of each frequency, the UE can perform RRC idle mode or RRC inactive mode frequency measurement by being implemented as a synchronized frequency, searching for SSB signals from the beginning, and deriving parameter values ​​of periodicity, offset and duration. In another alternative method, method 2-2 (14-52) may be applied.

[0260] ■1> If the UE moves from the first cell from which it has received the RRCRelease message, and camps on a new second cell (13-53),

[0261] ◆2> The UE prioritizes the first frequency list of the first frequency configuration information 13-10 for frequency measurement. However, when performing measurement of the frequencies of the first frequency list, it may be characterized in that priority is given to the second configuration information for SSB measurement of each frequency rather than the first configuration information for SSB measurement of each frequency. Therefore, the UE may perform frequency measurement on the frequencies 13-51 (i.e., frequency 1 (13-01), frequency 2 (13-02), frequency 3 (13-03), frequency 4 (13-04), frequency 5 (13-05), and frequency 6 (13-06)) set in the first frequency list by applying the frequency measurement configuration information for each frequency set in the first frequency configuration information 13-10 (e.g., threshold information used as a standard for measurement and reporting of each frequency, first configuration information for SSB measurement of each frequency, or a first reporting method for measurement reporting of each frequency), determine a valid frequency measurement result, construct the result to be reported, and store the constructed result. Specifically, if first configuration information for SSB measurement of a target frequency corresponding to a first frequency list is received, but if second configuration information for SSB measurement of the frequency is broadcast in system information from a new second cell, the UE may give priority to the second configuration information for SSB measurement of each frequency broadcast in the system information to perform frequency measurement. That is, in method 1-1-1, based on the reference timing of the serving cell where the UE resides through a cell selection or reselection process, the UE may perform frequency measurement by applying the second configuration information (e.g., the periodicity, offset and / or duration of the smtc) to the SSB measurement of the target frequency to be measured (e.g., frequency 4 (13-04)). This is because, if the UE moves and resides on a new second cell, the second configuration information for SSB measurement of each frequency broadcast from the new second cell is likely to be more accurate than the first configuration information for SSB measurement of each frequency received from the previous first cell. In addition, this is because, if the cell synchronization is mismatched in the base station implementation, the system information following the new second cell may not cause problems due to asynchronous timing between cells. If there is neither the first configuration information nor the second configuration information for SSB measurement for the target frequency to be measured, the UE may not perform measurement of the frequency to reduce battery consumption. In an alternative method, even if there is no first configuration information for SSB measurement of each frequency, or even if there is no second configuration information for SSB measurement of each frequency, the UE may perform RRC idle mode or RRC inactive mode frequency measurement by being implemented as a synchronized frequency, searching for SSB signals from the beginning, and deriving parameter values ​​of periodicity, offset, and duration.In another alternative method, if the second configuration information for SSB measurement of each frequency is not broadcast in the system information of the target frequency of the first frequency list to be measured, but if the first frequency configuration information received in the RRCRelease message contains the first configuration information for SSB measurement of the frequency, then based on the reference timing of the serving cell on which the UE resides through the cell selection or reselection process, the UE can perform frequency measurement by applying the first configuration information (e.g., periodicity, offset, and / or duration of smtc) to the SSB measurement of the frequency. In yet another alternative method, the UE may store the reference timing of the cell from which the RRCRelease message is received, and based on the stored timing, perform measurement by applying the first configuration information or the second configuration information to the SSB measurement of each frequency. In yet another alternative method, the above-mentioned method 1-1 or method 1-2 may be applied.

[0262] ◆2> If the first frequency configuration information received in the RRCRelease message does not include the configuration information of the first frequency list, the UE may apply method 2-1 (14-51) to be described below. Specifically, the UE gives priority to the second frequency configuration information 14-20 to perform frequency measurement. Therefore, the UE may perform frequency measurement only on the frequencies 14-51 (i.e., frequency 3 (14-03), frequency 4 (14-04), frequency 5 (14-05), frequency 6 (14-06), frequency 7 (14-07), and frequency 8 (14-08)) set in the second frequency list by applying the frequency measurement configuration information for each frequency set in the second frequency configuration information 14-20 (for example, threshold information used as a standard for measurement and reporting of each frequency, second configuration information for SSB measurement of each frequency, or a second reporting method for measurement reporting of each frequency), determine valid frequency measurement results, construct the results to be reported, and store the constructed results. Specifically, in method 2-1, based on the reference timing of the serving cell on which the UE resides through a cell selection or reselection process, the UE can perform frequency measurement by applying the second configuration information (e.g., the periodicity, offset and / or duration of the smtc) to the SSB measurement of the target frequency to be measured. If there is no second configuration information for SSB measurement for the target frequency to be measured, the UE may not perform measurement of the frequency to reduce battery consumption. In an alternative method, even when there is no second configuration information for SSB measurement of each frequency, the UE can perform RRC idle mode or RRC inactive mode frequency measurement by being implemented as a synchronized frequency, searching for SSB signals from the beginning, and deriving parameter values ​​of periodicity, offset and duration. In another alternative method, method 2-2 (14-52) may be applied.

[0263] Fig.14is a diagram illustrating a second embodiment of an effective frequency measurement method in an RRC idle mode or an RRC inactive mode according to an embodiment of the present disclosure.

[0264] exist Fig.14 In the present invention, the base station or cell can set the configuration information for RRC idle mode or RRC inactive mode frequency measurement to the UE by using the first frequency measurement configuration information 14-10 in the RRCRelease message or the second frequency measurement configuration information 14-20 in the system information.

[0265] If the received RRCRelease message includes the first frequency configuration information, the UE may drive the timer by applying the first timer value information of the first frequency configuration information, and start RRC idle mode or RRC inactive mode frequency measurement (i.e., early measurement). In addition, if the first frequency configuration information includes the first area configuration information, the UE may identify the identifier of the cell on which the UE resides through the cell selection or reselection process, and may determine whether to perform early frequency measurement of RRC idle mode or RRC inactive mode. If the first frequency configuration information does not include the first frequency list information to be measured, and if the second frequency configuration is broadcast in the system information of the residing cell, the UE may perform RRC idle mode or RRC inactive mode frequency measurement based on the second frequency configuration information (e.g., the second frequency list information), store the valid measurement results, and when an RRC connection is established later, such as Figure 6 Or as described in 7, reporting the stored measurement results to the network.

[0266] exist Fig.14 In the second embodiment of the efficient RRC idle mode or RRC inactive mode frequency measurement method shown, the UE can receive the first frequency configuration information through the RRCRelease message, switch to the RRC idle mode or RRC inactive mode, and perform frequency measurement. In addition, the UE can receive the second frequency configuration information through the system information of the cell where the UE resides through the cell selection or reselection process.

[0267] In the second embodiment, the UE may receive the first frequency configuration information and / or the second frequency configuration information, give priority to the second frequency configuration information when performing RRC idle mode or RRC inactive mode frequency measurement, and perform frequency measurement only based on the second frequency configuration information. In addition, the UE may perform frequency measurement considering the first frequency configuration information relative to the configuration information not included in the second frequency configuration information.

[0268] For example, the UE may receive first frequency configuration information 14-10 in an RRCRelease message from a first cell, switch to an RRC idle mode or an RRC inactive mode, and then receive second frequency configuration information 14-20 in system information from the first cell or a new second cell through a cell selection or reselection process.

[0269] The first frequency list of the first frequency configuration information 14-10 may include frequency 1 (14-01), frequency 2 (14-02), frequency 3 (14-03), frequency 4 (14-04), frequency 5 (14-05), and frequency 6 (14-06) as target frequencies to be measured. Among these frequencies, only frequency 1 (14-01), frequency 2 (14-02), frequency 3 (14-03), and frequency 5 (14-05) may be configured with threshold information used as a standard for measurement and reporting of each frequency, first configuration information for SSB measurement of each frequency, or a first reporting method for measurement reporting of each frequency.

[0270] The second frequency list of the second frequency configuration information 14-20 may include frequency 3 (14-03), frequency 4 (14-04), frequency 5 (14-05), frequency 6 (14-06), frequency 7 (14-07), and frequency 8 (14-08) as target frequencies to be measured. Among these frequencies, only frequency 3 (14-03), frequency 4 (14-04), frequency 7 (14-07), and frequency 8 (14-08) may be configured with threshold information used as a standard for measurement and reporting of each frequency, second configuration information for SSB measurement of each frequency, or a second reporting method for measurement reporting of each frequency.

[0271] When receiving the first frequency configuration information 14-10 or the second frequency configuration information 14-20, the UE may select a frequency to be measured and then apply one of the following methods to determine the frequency configuration to be applied to each frequency.

[0272] -Method 2-1 (14-51): The UE gives priority to the second frequency configuration information 14-20 to perform frequency measurement. Therefore, the UE can perform frequency measurement only on the frequency 14-51 (i.e., frequency 3 (14-03), frequency 4 (14-04), frequency 5 (14-05), frequency 6 (14-06), frequency 7 (14-07), and frequency 8 (14-08)) set in the second frequency list by applying the frequency measurement configuration information of each frequency set in the second frequency configuration information 14-20 (e.g., threshold information used as a criterion for measurement and reporting of each frequency, second configuration information for SSB measurement of each frequency, or a second reporting method for measurement reporting of each frequency), determine a valid frequency measurement result, construct the result to be reported, and store the constructed result. Specifically, in method 2-1, based on the reference timing of the serving cell on which the UE resides through the cell selection or reselection process, the UE can perform frequency measurement by applying the second configuration information (e.g., periodicity, offset and / or duration of smtc) for SSB measurement of each frequency. If there is no second configuration information for SSB measurement of the target frequency to be measured, the UE may not perform measurement of the frequency to reduce battery consumption. In an alternative method, even when there is no second configuration information for SSB measurement of the frequency (e.g., periodicity, offset and / or duration of smtc), the UE may perform RRC idle mode or RRC inactive mode frequency measurement by being implemented as a synchronized frequency, searching for SSB signals from the beginning, and deriving parameter values ​​of periodicity, offset and duration.

[0273] -Method 2-2 (14-52): The UE gives priority to the second frequency configuration information 14-20 to perform frequency measurement. Therefore, the UE can perform frequency measurement only on the frequency 14-52 (i.e., frequency 3 (14-03), frequency 4 (14-04), frequency 5 (14-05), frequency 6 (14-06), frequency 7 (14-07), and frequency 8 (14-08)) set in the second frequency list by applying the frequency measurement configuration information of each frequency set in the second frequency configuration information 14-20 (e.g., threshold information used as a criterion for measurement and reporting of each frequency, second configuration information for SSB measurement of each frequency, or a second reporting method for measurement reporting of each frequency), determine a valid frequency measurement result, construct the result to be reported, and store the constructed result. Specifically, in method 2-2, based on the reference timing of the serving cell on which the UE resides through the cell selection or reselection process, the UE can perform frequency measurement by applying the second configuration information (e.g., periodicity, offset and / or duration of smtc) for SSB measurement of each frequency. If there is no second configuration information for SSB measurement for the target frequency to be measured (e.g., frequency 5 (14-05)), but if the first frequency configuration information received in the RRC Release message contains the first configuration information for SSB measurement of the frequency, based on the reference timing of the serving cell on which the UE resides through the cell selection or reselection process, the UE can perform frequency measurement by applying the first configuration information (e.g., periodicity, offset and / or duration of smtc) for SSB measurement of the frequency (e.g., frequency 5 (14-05)). If there is neither the first configuration information nor the second configuration information for SSB measurement for the target frequency to be measured, the UE may not perform measurement of the frequency to reduce battery consumption. In an alternative method, even if there is no first configuration information for SSB measurement of each frequency, or even if there is no second configuration information for SSB measurement of each frequency, the UE can perform RRC idle mode or RRC inactive mode frequency measurement by being implemented as a synchronized frequency, searching for SSB signals from the beginning, and deriving parameter values ​​of periodicity, offset and duration.

[0274] Fig.15 is a diagram showing a third embodiment of an effective frequency measurement method in an RRC idle mode or an RRC inactive mode according to an embodiment of the present disclosure.

[0275] exist Fig.15 In the present invention, the base station or cell can set the configuration information for RRC idle mode or RRC inactive mode frequency measurement to the UE by using the first frequency measurement configuration information 15-10 in the RRCRelease message or the second frequency measurement configuration information 15-20 in the system information.

[0276] If the received RRCRelease message includes the first frequency configuration information, the UE may drive the timer by applying the first timer value information of the first frequency configuration information, and start RRC idle mode or RRC inactive mode frequency measurement (i.e., early measurement). In addition, if the first frequency configuration information includes the first area configuration information, the UE may identify the identifier of the cell on which the UE resides through the cell selection or reselection process, and may determine whether to perform early frequency measurement of RRC idle mode or RRC inactive mode. If the first frequency configuration information does not include the first frequency list information to be measured, and if the second frequency configuration is broadcast in the system information of the residing cell, the UE may perform RRC idle mode or RRC inactive mode frequency measurement based on the second frequency configuration information (e.g., the second frequency list information), store the valid measurement results, and when an RRC connection is established later, such as Figure 6 Or as described in 7, reporting the stored measurement results to the network.

[0277] exist Fig.15 In the third embodiment of the efficient RRC idle mode or RRC inactive mode frequency measurement method shown, the UE can receive the first frequency configuration information through the RRCRelease message, switch to the RRC idle mode or RRC inactive mode, and perform frequency measurement. In addition, the UE can receive the second frequency configuration information through the system information of the cell where the UE resides through the cell selection or reselection process.

[0278] The third embodiment is characterized in that the UE receives the first frequency configuration information and / or the second frequency configuration information, compares the first frequency configuration information and the second frequency configuration information when performing RRC idle mode or RRC inactive mode frequency measurement, and performs frequency measurement on the frequency corresponding to the intersection of the first frequency list and the second frequency list based on the first frequency configuration information or the second frequency configuration information. In addition, the UE may perform frequency measurement considering the second frequency configuration information regarding configuration information not included in the first frequency configuration information, and may perform frequency measurement considering the first frequency configuration information regarding configuration information not included in the second frequency configuration information.

[0279] For example, the UE may receive first frequency configuration information 15-10 in an RRCRelease message from a first cell, switch to an RRC idle mode or an RRC inactive mode, and then receive second frequency configuration information 15-20 in system information from the first cell or a new second cell through a cell selection or reselection process.

[0280] The first frequency list of the first frequency configuration information 15-10 may include frequency 1 (15-01), frequency 2 (15-02), frequency 3 (15-03), frequency 4 (15-04), frequency 5 (15-05), and frequency 6 (15-06) as target frequencies to be measured. Among these frequencies, only frequency 1 (15-01), frequency 2 (15-02), frequency 3 (15-03), and frequency 5 (15-05) may be configured with threshold information used as a standard for measurement and reporting of each frequency, first configuration information for SSB measurement of each frequency, or a first reporting method for measurement reporting of each frequency.

[0281] The second frequency list of the second frequency configuration information 15-20 may include frequency 3 (15-03), frequency 4 (15-04), frequency 5 (15-05), frequency 6 (15-06), frequency 7 (15-07), and frequency 8 (15-08) as target frequencies to be measured. Among these frequencies, only frequency 3 (15-03), frequency 4 (15-04), frequency 7 (15-07), and frequency 8 (15-08) may be configured with threshold information used as a standard for measurement and reporting of each frequency, second configuration information for SSB measurement of each frequency, or a second reporting method for measurement reporting of each frequency.

[0282] When receiving the first frequency configuration information 15-10 or the second frequency configuration information 15-20, the UE may select a frequency to be measured and then apply one of the following methods to determine the frequency configuration to be applied to each frequency.

[0283] -Method 3-1 (15-51): When receiving the first frequency configuration information 15-10 or the second frequency configuration information 15-20, the UE compares the first frequency list information of the first frequency configuration information and the second frequency list information of the second frequency configuration information, selects a frequency corresponding to the intersection, and performs frequency measurement on the selected frequency. Therefore, the UE can perform frequency measurement only on the frequency 15-30 (i.e., frequency 3 (15-03), frequency 4 (15-04), frequency 5 (15-05), and frequency 6 (15-06)) corresponding to the intersection between the first and second frequency lists by applying the frequency measurement configuration information of each frequency set in the first frequency configuration information (for example, threshold information used as a criterion for measurement and reporting of each frequency, first configuration information for SSB measurement of each frequency, or a first reporting method for measurement reporting of each frequency), determine a valid frequency measurement result, construct the result to be reported, and store the constructed result. Specifically, in method 3-1, based on the reference timing of the serving cell on which the UE resides through the cell selection or reselection process, the UE can perform frequency measurement by applying the first configuration information (e.g., the periodicity, offset and / or duration of the smtc) for the SSB measurement of each frequency. If there is no first configuration information for the SSB measurement of the target frequency to be measured, the UE may not perform the measurement of the frequency to reduce battery consumption. In an alternative method, even when there is no first configuration information for the SSB measurement of the frequency (e.g., the periodicity, offset and / or duration of the smtc), the UE can perform RRC idle mode or RRC inactive mode frequency measurement by being implemented as a synchronized frequency, searching for SSB signals from the beginning, and deriving parameter values ​​of periodicity, offset and duration. In another alternative method, the UE may store the reference timing of the cell from which the RRC Release message is received, and based on the stored timing, perform measurement by applying the first configuration information to the SSB measurement of each frequency. In this method 3-1, the UE performs frequency measurement only based on the first frequency configuration information, so that there is no need to read a large amount of system information, thereby reducing the battery consumption of the UE.

[0284] -Method 3-2 (15-52): When receiving the first frequency configuration information 15-10 or the second frequency configuration information 15-20, the UE compares the first frequency list information of the first frequency configuration information and the second frequency list information of the second frequency configuration information, selects a frequency corresponding to the intersection, and performs frequency measurement on the selected frequency. Therefore, the UE can perform frequency measurement only on the frequency 15-30 (i.e., frequency 3 (15-03), frequency 4 (15-04), frequency 5 (15-05), and frequency 6 (15-06)) corresponding to the intersection between the first and second frequency lists by applying the frequency measurement configuration information of each frequency set in the first frequency configuration information (for example, threshold information used as a criterion for measurement and reporting of each frequency, first configuration information for SSB measurement of each frequency, or a first reporting method for measurement reporting of each frequency), determine a valid frequency measurement result, construct the result to be reported, and store the constructed result. Specifically, in method 3-2, based on the reference timing of the serving cell on which the UE resides through the cell selection or reselection process, the UE can perform frequency measurement by applying first configuration information (e.g., periodicity, offset and / or duration of smtc) for SSB measurement of each frequency. If there is no first configuration information for SSB measurement of the target frequency to be measured (e.g., frequency 4 (15-04)), but if the second frequency configuration information received in the system information contains second configuration information for SSB measurement of the frequency, then based on the reference timing of the serving cell on which the UE resides through the cell selection or reselection process, the UE can perform frequency measurement by applying second configuration information (e.g., periodicity, offset and / or duration of smtc) for SSB measurement of the frequency (e.g., frequency 4 (15-04)). If there is neither first configuration information nor second configuration information for SSB measurement for the target frequency to be measured, the UE may not perform measurement of the frequency to reduce battery consumption. In an alternative method, even without the first configuration information for SSB measurement of each frequency, or even without the second configuration information for SSB measurement of each frequency, the UE can perform RRC idle mode or RRC inactive mode frequency measurement by being implemented as a synchronized frequency, searching for SSB signals from the beginning, and deriving parameter values ​​of periodicity, offset, and duration.

[0285] -Method 3-3 (15-53): When receiving the first frequency configuration information 15-10 or the second frequency configuration information 15-20, the UE compares the first frequency list information of the first frequency configuration information and the second frequency list information of the second frequency configuration information, selects a frequency corresponding to the intersection, and performs frequency measurement on the selected frequency. Therefore, the UE can perform frequency measurement only on the frequency 15-30 (i.e., frequency 3 (15-03), frequency 4 (15-04), frequency 5 (15-05), and frequency 6 (15-06)) corresponding to the intersection between the first and second frequency lists by applying the frequency measurement configuration information of each frequency set in the second frequency configuration information (for example, threshold information used as a criterion for measurement and reporting of each frequency, second configuration information for SSB measurement of each frequency, or a second reporting method for measurement reporting of each frequency), determine a valid frequency measurement result, construct the result to be reported, and store the constructed result. Specifically, in method 3-3, based on the reference timing of the serving cell on which the UE resides through the cell selection or reselection process, the UE can perform frequency measurement by applying the second configuration information (e.g., the periodicity, offset and / or duration of smtc) for the SSB measurement of each frequency. If there is no second configuration information for the SSB measurement of the target frequency to be measured, the UE may not perform the measurement of the frequency to reduce battery consumption. In an alternative method, even when there is no second configuration information for the SSB measurement of the frequency (e.g., the periodicity, offset and / or duration of smtc), the UE can perform RRC idle mode or RRC inactive mode frequency measurement by being implemented as a synchronized frequency, searching for SSB signals from the beginning, and deriving parameter values ​​of the periodicity, offset and duration.

[0286] -Method 3-4 (15-54): When receiving the first frequency configuration information 15-10 or the second frequency configuration information 15-20, the UE compares the first frequency list information of the first frequency configuration information and the second frequency list information of the second frequency configuration information, selects a frequency corresponding to the intersection, and performs frequency measurement on the selected frequency. Therefore, the UE can perform frequency measurement only on the frequency 15-30 (i.e., frequency 3 (15-03), frequency 4 (15-04), frequency 5 (15-05), and frequency 6 (15-06)) corresponding to the intersection between the first and second frequency lists by applying the frequency measurement configuration information for each frequency set in the second frequency configuration information (e.g., threshold information used as a criterion for measurement and reporting of each frequency, second configuration information for SSB measurement of each frequency, or a second reporting method for measurement reporting of each frequency), determine a valid frequency measurement result, construct the result to be reported, and store the constructed result. Specifically, in method 3-4, based on the reference timing of the serving cell on which the UE resides through the cell selection or reselection process, the UE can perform frequency measurement by applying the second configuration information (e.g., the periodicity, offset and / or duration of the smtc) for the SSB measurement of each frequency. If there is no second configuration information for the SSB measurement of the target frequency to be measured (e.g., frequency 5 (15-05)), but if the first frequency configuration information received in the RRCRelease message contains the first configuration information for the SSB measurement of the frequency, then based on the reference timing of the serving cell on which the UE resides through the cell selection or reselection process, the UE can perform frequency measurement by applying the first configuration information (e.g., the periodicity, offset and / or duration of the smtc) for the SSB measurement of the frequency (e.g., frequency 5 (15-05)). If there is neither the first configuration information nor the second configuration information for SSB measurement for the target frequency to be measured, the UE may not perform measurement of the frequency to reduce battery consumption. In an alternative method, even without the first configuration information for SSB measurement of each frequency, or even without the second configuration information for SSB measurement of each frequency, the UE can perform RRC idle mode or RRC inactive mode frequency measurement by being implemented as a synchronized frequency, searching for SSB signals from the beginning, and deriving parameter values ​​of periodicity, offset, and duration.

[0287] Fig.16 is a diagram showing a fourth embodiment of an effective frequency measurement method in an RRC idle mode or an RRC inactive mode according to an embodiment of the present disclosure.

[0288] exist Fig.16In the present invention, the base station or cell can set the configuration information for RRC idle mode or RRC inactive mode frequency measurement to the UE by using the first frequency measurement configuration information 16-10 in the RRC Release message or the second frequency measurement configuration information 16-20 in the system information.

[0289] If the received RRCRelease message includes the first frequency configuration information, the UE may drive the timer by applying the first timer value information of the first frequency configuration information, and start RRC idle mode or RRC inactive mode frequency measurement (i.e., early measurement). In addition, if the first frequency configuration information includes the first area configuration information, the UE may identify the identifier of the cell on which the UE resides through the cell selection or reselection process, and may determine whether to perform early frequency measurement of RRC idle mode or RRC inactive mode. If the first frequency configuration information does not include the first frequency list information to be measured, and if the second frequency configuration is broadcast in the system information of the residing cell, the UE may perform RRC idle mode or RRC inactive mode frequency measurement based on the second frequency configuration information (e.g., the second frequency list information), store the valid measurement results, and when an RRC connection is established later, such as Figure 6 Or as described in 7, reporting the stored measurement results to the network.

[0290] exist Fig.16 In the fourth embodiment of the efficient RRC idle mode or RRC inactive mode frequency measurement method shown, the UE can receive the first frequency configuration information through the RRCRelease message, switch to the RRC idle mode or RRC inactive mode, and perform frequency measurement. In addition, the UE can receive the second frequency configuration information through the system information of the cell on which the UE resides through the cell selection or reselection process.

[0291] The fourth embodiment is characterized in that the UE receives the first frequency configuration information and / or the second frequency configuration information, compares the first frequency configuration information and the second frequency configuration information when performing RRC idle mode or RRC inactive mode frequency measurement, and performs frequency measurement on the frequency corresponding to the union of the first frequency list and the second frequency list based on the first frequency configuration information or the second frequency configuration information. In addition, the UE may perform frequency measurement considering the second frequency configuration information regarding the configuration information not included in the first frequency configuration information, and may perform frequency measurement considering the first frequency configuration information regarding the configuration information not included in the second frequency configuration information.

[0292] For example, the UE may receive first frequency configuration information 16-10 in an RRCRelease message from a first cell, switch to an RRC idle mode or an RRC inactive mode, and then receive second frequency configuration information 16-20 in system information from the first cell or a new second cell through a cell selection or reselection process.

[0293] The first frequency list of the first frequency configuration information 16-10 may include frequency 1 (16-01), frequency 2 (16-02), frequency 3 (16-03), frequency 4 (16-04), frequency 5 (16-05), and frequency 6 (16-06) as target frequencies to be measured. Among these frequencies, only frequency 1 (16-01), frequency 2 (16-02), frequency 3 (16-03), and frequency 5 (16-05) may be configured with threshold information used as a standard for measurement and reporting of each frequency, first configuration information for SSB measurement of each frequency, or a first reporting method for measurement reporting of each frequency.

[0294] The second frequency list of the second frequency configuration information 16-20 may include frequency 3 (16-03), frequency 4 (16-04), frequency 5 (16-05), frequency 6 (16-06), frequency 7 (16-07), and frequency 8 (16-08) as target frequencies to be measured. Among these frequencies, only frequency 3 (16-03), frequency 4 (16-04), frequency 7 (16-07), and frequency 8 (16-08) may be configured with threshold information used as a standard for measurement and reporting of each frequency, second configuration information for SSB measurement of each frequency, or a second reporting method for measurement reporting of each frequency.

[0295] When receiving the first frequency configuration information 16-10 or the second frequency configuration information 16-20, the UE may select a frequency to be measured and then apply one of the following methods to determine the frequency configuration to be applied to each frequency.

[0296] -Method 4-1 (16-51): When receiving the first frequency configuration information 16-10 or the second frequency configuration information 16-20, the UE compares the first frequency list information of the first frequency configuration information and the second frequency list information of the second frequency configuration information, selects a frequency corresponding to the union, and performs frequency measurement on the selected frequency. Therefore, the UE performs frequency measurement only on frequencies 16-10, 16-20, and 16-30 (i.e., frequency 1 (16-01), frequency 2 (16-02), frequency 3 (16-03), frequency 4 (16-04), frequency 5 (16-05), frequency 6 (16-06), frequency 7 (16-07), and frequency 8 (16-08)) corresponding to the union between the first and second frequency lists by applying the frequency measurement configuration information for each frequency set in the first or second frequency configuration information (for example, threshold information used as a criterion for measurement and reporting of each frequency, the first or second configuration information for SSB measurement of each frequency, or the first or second reporting method for measurement reporting of each frequency), determines a valid frequency measurement result, constructs the result to be reported, and stores the constructed result. Specifically, in method 4-1, based on the reference timing of the serving cell on which the UE resides through a cell selection or reselection process, the UE can perform frequency measurement by applying first configuration information for SSB measurement (e.g., periodicity, offset and / or duration of smtc) to each frequency in the first frequency list or applying second configuration information for SSB measurement to each frequency in the second frequency list. In method 4-1, the UE may prioritize the first frequency configuration information for the frequency corresponding to the intersection between the first and second frequency lists. If there are first frequency configuration information and second frequency configuration information about the target frequency to be measured (e.g., frequency 3 (16-03)), the UE may prioritize the first frequency configuration information. If there is no first configuration information for SSB measurement of the target frequency to be measured in the first frequency list, or if there is no second configuration information for SSB measurement of the target frequency to be measured in the second frequency list, the UE may not perform frequency measurement to reduce battery consumption. In an alternative method, even when there is no first configuration information for SSB measurement of the target frequency in the first frequency list, or even when there is no second configuration information for SSB measurement of the target frequency in the second frequency list, the UE can perform RRC idle mode or RRC inactive mode frequency measurement by being implemented as a synchronized frequency, searching for SSB signals from the beginning, and deriving parameter values ​​of periodicity, offset, and duration.

[0297] -Method 4-2 (16-52): When receiving the first frequency configuration information 16-10 or the second frequency configuration information 16-20, the UE compares the first frequency list information of the first frequency configuration information and the second frequency list information of the second frequency configuration information, selects a frequency corresponding to the union, and performs frequency measurement on the selected frequency. Therefore, the UE performs frequency measurement only on frequencies 16-10, 16-20, and 16-30 (i.e., frequency 1 (16-01), frequency 2 (16-02), frequency 3 (16-03), frequency 4 (16-04), frequency 5 (16-05), frequency 6 (16-06), frequency 7 (16-07), and frequency 8 (16-08)) corresponding to the union between the first and second frequency lists by applying the frequency measurement configuration information for each frequency set in the first or second frequency configuration information (for example, threshold information used as a criterion for measurement and reporting of each frequency, the first or second configuration information for SSB measurement of each frequency, or the first or second reporting method for measurement reporting of each frequency), determines a valid frequency measurement result, constructs the result to be reported, and stores the constructed result. Specifically, in method 4-2, based on the reference timing of the serving cell on which the UE resides through a cell selection or reselection process, the UE can perform frequency measurement by applying first configuration information for SSB measurement (e.g., periodicity, offset and / or duration of smtc) to each frequency in the first frequency list or applying second configuration information for SSB measurement to each frequency in the second frequency list. In method 4-2, the UE may prioritize the first frequency configuration information for the frequency corresponding to the intersection between the first and second frequency lists. If there are first frequency configuration information and second frequency configuration information regarding the target frequency to be measured (e.g., frequency 3 (16-03)), the UE may prioritize the first frequency configuration information. If there is no first configuration information for SSB measurement of the target frequency to be measured (e.g., frequency 4 (16-04)), but if the second frequency configuration information received in the system information contains second configuration information for SSB measurement of the frequency, then based on the reference timing of the serving cell on which the UE resides through the cell selection or reselection process, the UE can perform frequency measurement by applying the second configuration information (e.g., periodicity, offset and / or duration of smtc) for SSB measurement of the frequency (e.g., frequency 4 (16-04)).In addition, if there is no second configuration information for SSB measurement for the target frequency to be measured (e.g., frequency 5 (16-05)), but if the first frequency configuration information received in the RRCRelease message contains the first configuration information for SSB measurement of the frequency, based on the reference timing of the serving cell on which the UE resides through the cell selection or reselection process, the UE can perform frequency measurement by applying the first configuration information (e.g., periodicity, offset and / or duration of smtc) for SSB measurement of the frequency (e.g., frequency 5 (16-05)). If there is neither the first configuration information nor the second configuration information for SSB measurement for the target frequency to be measured, the UE may not perform measurement of the frequency to reduce battery consumption. In an alternative method, even if there is no first configuration information for SSB measurement of each frequency, or even if there is no second configuration information for SSB measurement of each frequency, the UE can perform RRC idle mode or RRC inactive mode frequency measurement by being implemented as a synchronized frequency, searching for SSB signals from the beginning, and deriving parameter values ​​of periodicity, offset and duration.

[0298] -Method 4-3 (16-53): When receiving the first frequency configuration information 16-10 or the second frequency configuration information 16-20, the UE compares the first frequency list information of the first frequency configuration information and the second frequency list information of the second frequency configuration information, selects a frequency corresponding to the union, and performs frequency measurement on the selected frequency. Therefore, the UE performs frequency measurement only on frequencies 16-10, 16-20, and 16-30 (i.e., frequency 1 (16-01), frequency 2 (16-02), frequency 3 (16-03), frequency 4 (16-04), frequency 5 (16-05), frequency 6 (16-06), frequency 7 (16-07), and frequency 8 (16-08)) corresponding to the union between the first and second frequency lists by applying the frequency measurement configuration information for each frequency set in the first or second frequency configuration information (for example, threshold information used as a criterion for measurement and reporting of each frequency, the first or second configuration information for SSB measurement of each frequency, or the first or second reporting method for measurement reporting of each frequency), determines a valid frequency measurement result, constructs the result to be reported, and stores the constructed result. Specifically, in method 4-3, based on the reference timing of the serving cell on which the UE resides through a cell selection or reselection process, the UE may perform frequency measurement by applying first configuration information for SSB measurement (e.g., periodicity, offset and / or duration of smtc) to each frequency in the first frequency list or applying second configuration information for SSB measurement to each frequency in the second frequency list. In method 4-3, the UE may give priority to the second frequency configuration information for the frequency corresponding to the intersection between the first and second frequency lists. If there are first frequency configuration information and second frequency configuration information about the target frequency to be measured (e.g., frequency 3 (16-03)), the UE may give priority to the second frequency configuration information. If there is no first configuration information for SSB measurement of the target frequency to be measured in the first frequency list, or if there is no second configuration information for SSB measurement of the target frequency to be measured in the second frequency list, the UE may not perform frequency measurement to reduce battery consumption. In an alternative method, even when there is no first configuration information for SSB measurement of the target frequency in the first frequency list, or even when there is no second configuration information for SSB measurement of the target frequency in the second frequency list, the UE can perform RRC idle mode or RRC inactive mode frequency measurement by being implemented as a synchronized frequency, searching for SSB signals from the beginning, and deriving parameter values ​​of periodicity, offset, and duration.

[0299] -Method 4-4 (16-54): When receiving the first frequency configuration information 16-10 or the second frequency configuration information 16-20, the UE compares the first frequency list information of the first frequency configuration information and the second frequency list information of the second frequency configuration information, selects a frequency corresponding to the union, and performs frequency measurement on the selected frequency. Therefore, the UE performs frequency measurement only on frequencies 16-10, 16-20, and 16-30 (i.e., frequency 1 (16-01), frequency 2 (16-02), frequency 3 (16-03), frequency 4 (16-04), frequency 5 (16-05), frequency 6 (16-06), frequency 7 (16-07), and frequency 8 (16-08)) corresponding to the union between the first and second frequency lists by applying the frequency measurement configuration information for each frequency set in the first or second frequency configuration information (for example, threshold information used as a criterion for measurement and reporting of each frequency, the first or second configuration information for SSB measurement of each frequency, or the first or second reporting method for measurement reporting of each frequency), determines a valid frequency measurement result, constructs the result to be reported, and stores the constructed result. Specifically, in method 4-4, based on the reference timing of the serving cell on which the UE resides through a cell selection or reselection process, the UE can perform frequency measurement by applying first configuration information for SSB measurement (e.g., periodicity, offset and / or duration of smtc) to each frequency in the first frequency list or applying second configuration information for SSB measurement to each frequency in the second frequency list. In method 4-4, the UE may give priority to the second frequency configuration information for the frequency corresponding to the intersection between the first and second frequency lists. If there are first frequency configuration information and second frequency configuration information regarding the target frequency to be measured (e.g., frequency 3 (16-03)), the UE may give priority to the second frequency configuration information. If there is no first configuration information for SSB measurement of the target frequency to be measured (e.g., frequency 4 (16-04)), but if the second frequency configuration information received in the system information contains second configuration information for SSB measurement of the frequency, then based on the reference timing of the serving cell on which the UE resides through the cell selection or reselection process, the UE can perform frequency measurement by applying the second configuration information (e.g., periodicity, offset and / or duration of smtc) for SSB measurement of the frequency (e.g., frequency 4 (16-04)).In addition, if there is no second configuration information for SSB measurement for the target frequency to be measured (e.g., frequency 5 (16-05)), but if the first frequency configuration information received in the RRCRelease message contains the first configuration information for SSB measurement of the frequency, based on the reference timing of the serving cell on which the UE resides through the cell selection or reselection process, the UE can perform frequency measurement by applying the first configuration information (e.g., periodicity, offset and / or duration of smtc) for SSB measurement of the frequency (e.g., frequency 5 (16-05)). If there is neither the first configuration information nor the second configuration information for SSB measurement for the target frequency to be measured, the UE may not perform measurement of the frequency to reduce battery consumption. In an alternative method, even if there is no first configuration information for SSB measurement of each frequency, or even if there is no second configuration information for SSB measurement of each frequency, the UE can perform RRC idle mode or RRC inactive mode frequency measurement by being implemented as a synchronized frequency, searching for SSB signals from the beginning, and deriving parameter values ​​of periodicity, offset and duration.

[0300] At the same time, each of the above-mentioned first, second, third and fourth embodiments can also be applied to other situations in which the base station or the network sets the configuration information for RRC idle mode or RRC inactive mode frequency measurement by using only the first frequency configuration information of the RRCRelease message. Similarly, each of the above-mentioned first, second, third and fourth embodiments can also be applied to other situations in which the base station or the network sets the configuration information for RRC idle mode or RRC inactive mode frequency measurement by using only the second frequency configuration information of the system information.

[0301] Fig.17 is a diagram illustrating a method in which a terminal performs frequency measurement in an RRC idle mode or an RRC inactive mode in a network in which different frequencies or cells are not synchronized according to an embodiment of the present disclosure.

[0302] exist Fig.17 In the present invention, a UE sending / receiving data in RRC connected mode in the current cell 17-01 (first cell) can receive an RRCRelease message from the base station of the current cell 17-01, switch to RRC idle mode or RRC inactive mode, and move while performing a cell selection or reselection process. The RRCRelease message may include first frequency configuration information. In addition, an RRC idle mode or RRC inactive mode UE can reside on a suitable cell through a cell selection or reselection process and obtain system information. The UE can receive second frequency configuration information in the system information.

[0303] If the received RRCRelease message includes the first frequency configuration information, the UE can drive the timer by applying the first timer value information of the first frequency configuration information, and start the early frequency measurement of the RRC idle mode or the RRC inactive mode. In addition, if the first frequency configuration information includes the first area configuration information, the UE can identify the identifier of the camped cell and determine whether to perform the early frequency measurement of the RRC idle mode or the RRC inactive mode.

[0304] If the UE is in the service area of ​​the first cell 17-01, the UE may perform early frequency measurement of the RRC idle mode or the RRC inactive mode based on the first frequency configuration information received in the RRCRelease message or the second frequency configuration information broadcasted by the first cell 17-01 as system information. Specifically, according to the first, second, third or fourth embodiment above, the UE may perform early frequency measurement of the RRC idle mode or the RRC inactive mode.

[0305] If the UE moves from the first cell 17-01 to the service area of ​​the second cell 17-02 and resides on the second cell 17-02, the UE can perform RRC idle mode or RRC inactive mode frequency measurement based on the first frequency configuration information received in the RRCRelease message or the second frequency configuration information broadcast as system information by the second cell 17-02. Specifically, according to the above-mentioned first, second, third or fourth embodiment, the UE can perform early frequency measurement of RRC idle mode or RRC inactive mode.

[0306] A method is described below for a UE to determine a reference timing when performing frequency measurement based on first frequency configuration information that has been set by a base station or a network through an RRC message (e.g., an RRCRelease message or an RRCReconfiguration message). The reference timing determination method to be described below can be applied to each of the first, second, third and fourth embodiments described above.

[0307] - Reference timing determination method 1: In reference timing determination method 1, the network may assume that all frequencies of the network are managed as synchronized, or assume that synchronization information is broadcast through system information of each cell. Therefore, the base station may set the first frequency configuration information in the RRC message to the UE, and the UE may determine the reference timing for frequency measurement of the RRC idle mode or RRC inactive mode based on the reference timing (e.g., SFN0) of the cell where the UE resides or synchronizes through the cell selection or reselection process, and may apply the SSB configuration information for each frequency to perform the RRC idle mode or RRC inactive mode frequency measurement.

[0308] - Reference timing determination method 2: In reference timing determination method 2, the network does not assume that all frequencies of the network are managed as synchronized. Therefore, the base station can assume the current cell as the reference timing, thereby setting the first frequency configuration information in the RRC message to the UE. The UE can then store the cell reference timing (e.g., SFN 0) of the first frequency configuration information received through the RRC message, determine the reference timing for frequency measurement in RRC idle mode or RRC inactive mode based on the stored reference timing, and apply the SSB configuration information for each frequency to perform RRC idle mode or RRC inactive mode frequency measurement.

[0309] -Reference timing determination method 3: In reference timing determination method 3, the network does not assume that all frequencies of the network are managed as synchronized. Therefore, the base station may assume the current cell or the cell indicated in the first area configuration information as the reference timing, thereby setting the first frequency configuration information in the RRC message to the UE. Then, only when the cell in which the UE resides through the cell selection or reselection process is the cell that sends the first frequency configuration information through the RRC message or the cell indicated in the first area information of the first frequency configuration information, the UE can perform RRC idle mode or RRC inactive mode frequency measurement. In other cases, the UE can stop frequency measurement. Therefore, the UE can store the cell reference timing (e.g., SFN 0) of the first frequency configuration information received through the RRC message, and determine the reference timing of the frequency measurement based on the stored reference timing, or alternatively, determine the reference timing of the frequency measurement based on the reference timing of the resident cell. Then, based on the reference timing, the UE can apply the SSB configuration information of each frequency to perform RRC idle mode or RRC inactive mode frequency measurement.

[0310] - Reference timing determination method 4: In reference timing determination method 4, the network does not assume that all frequencies of the network are managed as synchronized. Therefore, the base station can set only the frequencies synchronized in the entire network to the UE in the first frequency configuration information through the RRC message (assuming that the frequencies included in the first frequency list are synchronized in the entire network). Therefore, for each frequency of the first frequency list set in the first frequency configuration information, the UE can synchronize with any cell of the corresponding frequency, determine the reference timing based on the reference timing of the synchronized cell, and apply the SSB configuration information for each frequency to perform RRC idle mode or RRC inactive mode frequency measurement.

[0311] - Reference timing determination method 5: In reference timing determination method 5, the network does not assume that all frequencies of the network are managed as synchronized. Therefore, the base station can set only the frequencies synchronized in the entire network to the UE in the first frequency configuration information through the RRC message (assuming that the frequencies included in the first frequency list are synchronized in the entire network). Therefore, for a specific frequency of the first frequency list set in the first frequency configuration information, the UE can synchronize with any cell of any frequency of the first frequency list, determine the reference timing based on the reference timing of the synchronized cell, and apply the SSB configuration information for each frequency to perform RRC idle mode or RRC inactive mode frequency measurement.

[0312] - Reference timing determination method 6: In reference timing determination method 6, the network does not assume that all frequencies of the network are managed as synchronized. Therefore, the base station can set the reference frequency, cell or area synchronized in the entire network (assuming that the frequencies included in the separate reference list are synchronized in the entire network) to the UE through an RRC message as a separate reference list in the first frequency configuration information. Therefore, for a certain frequency of the first frequency list set in the first frequency configuration information, the UE can synchronize with any cell of any frequency of the separate reference frequency list, determine the reference timing based on the reference timing of the synchronized cell, and apply the SSB configuration information for each frequency to perform RRC idle mode or RRC inactive mode frequency measurement.

[0313] Based on the second frequency configuration information broadcast in the system information, the above-mentioned reference timing determination methods 1, 2, 3, 4, 5 and 6 may be applied when performing a cell selection or reselection procedure, measuring a neighboring cell, or performing RRC idle mode or RRC inactive mode frequency measurement.

[0314] Furthermore, described hereinafter is a first UE operation for performing frequency measurement in different methods depending on which RRC message is used to set frequency measurement configuration information to the UE.

[0315] -When the received RRC message is an RRCRelease message, the RRC connected mode UE transitions to the RRC idle mode or the RRC inactive mode. Then, if the RRC message includes frequency measurement configuration information (e.g., first frequency measurement configuration information for the RRC idle mode or the RRC inactive mode), the UE applies the SSB configuration information or the SMTC configuration information to the frequency to be measured based on the serving cell on which the UE resides through the cell selection or reselection process, thereby performing frequency measurement.

[0316] -When the received RRC message is an RRCReconfiguration message, the RRC connected mode UE performs frequency measurement in the RRC connected mode. If the RRC message includes frequency measurement configuration information (e.g., first frequency measurement configuration information for the RRC connected mode), the UE applies the SSB configuration information or the smtc configuration information to the frequency to be measured based on the currently connected PCell, thereby performing frequency measurement.

[0317] Furthermore, described hereinafter is a second UE operation for performing frequency measurement in different methods depending on which RRC message is used to set frequency measurement configuration information to the UE.

[0318] -When the received RRC message is an RRCRelease message, the RRC connected mode UE transitions to the RRC idle mode or the RRC inactive mode. Then, if the RRC message includes frequency measurement configuration information (e.g., the first frequency measurement configuration information for the RRC idle mode or the RRC inactive mode), the UE applies the first, second, third or fourth embodiment described above, thereby performing frequency measurement.

[0319] -When the received RRC message is an RRCReconfiguration message, the RRC connected mode UE performs frequency measurement in the RRC connected mode. If the RRC message includes frequency measurement configuration information (e.g., first frequency measurement configuration information for the RRC connected mode), the UE applies the SSB configuration information or the smtc configuration information to the frequency to be measured based on the currently connected PCell, thereby performing frequency measurement.

[0320] The RRC message may contain multiple of the following information types or parts thereof, which may be applicable when the UE performs early frequency measurement in RRC idle mode, RRC inactive mode or RRC connected mode.

[0321] - Configuration information of the frequencies to be measured in RRC idle mode or RRC inactive mode

[0322] ■Frequency configuration information

[0323] ◆LTE frequency measurement information group or list (EUTRA frequency configuration information / list / group)

[0324] ●It can be set to include early measurement settings regarding which frequencies or frequency bands to measure (e.g., a frequency list), which order to use for measurements based on frequency priority, which filtering method to use to measure frequency strength (e.g., L1, L2, or L3 filtering method, or which calculation method and which coefficient to use for measurement), which event or condition to apply to start frequency measurement, which criterion (e.g., signal strength greater than a threshold) will be used for measurement and reporting compared to the current serving cell (or current resident frequency), which event or condition will be applied to the results of reported frequency measurements, which criterion or condition the reported frequency needs to meet compared to the current serving cell (or current resident frequency), or which period will be applied to report frequency measurement results.

[0325] NR frequency measurement information group or list (NR frequency configuration information / list / group)

[0326] ●It can be set to include early measurement settings about which frequencies or frequency bands to measure (e.g., a frequency list), SSB identifier information based on each frequency, SSB transmission resources (e.g., frequency and time resources, beam identifier or beam indicator, smtc configuration information) or priority of each frequency (or each SSB), which order to use for measurement, which filtering method to use for measuring frequency strength (e.g., L1, L2 or L3 filtering method, or which calculation method and which coefficient to be used for measurement), which event or condition to be applied to start frequency measurement, which criterion (e.g., signal strength greater than a threshold) to be compared with the current serving cell (or current resident frequency) for measurement and reporting, which event or condition to be applied to report the results of frequency measurement, which criterion or condition needs to be met to report the frequency compared with the current serving cell (or current resident frequency), or which period to be applied to report the frequency measurement results.

[0327] ■Duration or timer value (e.g., T331) for performing frequency measurement in RRC idle mode or RRC inactive mode: According to an embodiment, the same timer can be set for the LTE frequency and the NR frequency, or different timers can be set for the LTE frequency and the NR frequency, respectively. Since the LTE frequency characteristics (low frequency band) and the NR frequency characteristics (high frequency band) are different, the use of different timers can adjust the frequency measurement time of the UE individually, thereby saving the battery of the UE. For example, if the RRCRelease message instructs frequency measurement in RRC idle mode or RRC inactive mode, the frequency measurement can be performed while the timer is running and can be stopped when the timer expires.

[0328] ■Valid area information for performing frequency measurement in RRC idle mode or RRC inactive mode: In one method, based on a list of physical cell identifiers (PCIDs), when the UE is in an area (e.g., a cell) indicated by area information, the UE may perform frequency measurement, and when it is outside the indicated area, the frequency measurement may be stopped. For example, when the UE is outside the area, the timer may be stopped and the frequency measurement may be stopped. In another method, the base station may use an indicator to instruct the UE transitioning to the RRC inactive mode to determine whether to use the RAN indication area as the valid area. For example, when the base station instructs the UE transitioning to the RRC inactive mode to use the RAN indication area as the valid area through the indicator, the UE may perform frequency measurement within the RAN indication area while maintaining the RRC inactive mode within the RAN indication area. In yet another method, the base station may instruct the UE to use the valid area as the RAN indication area through the indicator. In another method, in the RRC inactive mode, the UE may apply the RAN indication area as the valid area without the indicator, and in the RRC active mode, a separate valid area may be set for the UE. This proposed method can reduce signaling overhead because the RRC message indicates both the RAN indication area and the validity area as a list of cell identifiers, and can also reduce the UE implementation burden because the validity area does not need to be managed separately in the UE implementation.

[0329] ■Measurement reporting threshold: In a configured frequency group, one or more frequencies with signal strength above a threshold can be reported.

[0330] The conditions for the UE to stop early frequency measurement in RRC idle mode or inactive mode may be one or more of the following conditions:

[0331] 1. When the system information of the current cell supports early frequency measurement result reporting, and after the UE sends, or when the UE attempts to send an RRC message with a measurement result report to the base station (e.g., message 5),

[0332] 2. When the system information of the current cell does not indicate that it supports early frequency measurement result reporting,

[0333] 3. When the UE establishes a connection with the network while performing RRC idle mode or RRC inactive mode frequency measurement, it stops the timer and measurement when receiving the RRCSetup message or RRCResume message through message 4, and then attempts to send an RRC message (e.g., message 5) to the base station, the RRC message indicating that the system information of the current cell supports early frequency measurement result reporting and there is a measurement result report,

[0334] 4. When the measurement report timer (e.g. T331) expires, and

[0335] 5. When the UE is outside the area indicated by the RRC idle mode or RRC inactive mode measurement area information set in the RRCRelease message.

[0336] According to one or more of the above conditions, the UE may stop RRC idle mode or RRC inactive mode frequency measurement.

[0337] The UE performs measurement of measurable frequencies in the configuration information related to early frequency measurement, i.e., frequencies supported by UE capabilities (e.g., frequencies that can be used for CA or DC technology), and at this time the UE can preferentially select a specific frequency to be measured according to a predetermined priority.

[0338] In another method, when the area configuration information (i.e., the configuration information about the area in which the frequency measurement configuration is valid) is set to the UE through the RRCRelease message in the frequency measurement configuration information in the RRC idle mode or the RRC inactive mode, the UE can stop or restart the RRC idle mode or the RRC inactive mode frequency measurement based on the system information or the cell identifier of the resident cell, while the timer indicating the frequency measurement duration is running (if the timer has not expired). Specifically, the RRC idle mode or RRC inactive mode UE that moves while performing the cell selection or reselection process can continue to perform frequency measurement, and if the physical cell identifier of the serving cell on which the UE resides is included in the area configuration information, the timer indicating the frequency measurement duration is run. However, if the physical cell identifier of the resident serving cell is not included in the area configuration information, the UE can stop the frequency measurement, continue to run the timer, and maintain the frequency measurement configuration information set in the RRC message (if the frequency measurement information or the frequency measurement list is set in the RRC message). If the UE reselects a cell with a cell identifier included in the area configuration information and resides again, the frequency measurement can be restarted while the timer is running (if the timer has not expired). Furthermore, when a timer indicating the frequency measurement duration expires, the frequency measurement configuration information may be released or discarded.

[0339] -1> When the UE receives the RRCRelease message (or receives the RRCRelease message in response to the RRCResumeRequest), if the base station does not set the frequency measurement configuration information in the RRCRelease message or the UE does not receive the frequency measurement configuration information (or frequency measurement list) through the RRCRelease message,

[0340] ■2> The UE receives or obtains frequency measurement configuration information for RRC idle mode or RRC inactive mode frequency measurement from the system information (e.g., SIB5) of the resident cell, and stores it. In addition, the UE may perform or restart RRC idle mode or RRC inactive mode frequency measurement according to the frequency measurement configuration information. In an alternative method, if there is no frequency measurement configuration information in the RRCRelease message, the UE may determine it as an instruction to stop frequency measurement, stop frequency measurement, stop the timer, and discard the frequency measurement configuration information or the frequency measurement result. In another alternative method, the RRCRelease message may define an indicator to discard or keep the frequency measurement configuration information or the frequency measurement result.

[0341] -1> When the UE receives the RRCRelease message (or when the RRCRelease message is received in response to the RRCResumeRequest), if the base station has set the frequency measurement configuration information in the RRCRelease message, the UE has received the frequency measurement configuration information (or frequency measurement list) through the RRCRelease message, or the timer for frequency measurement is running (if the timer has not expired),

[0342] ■2>UE may discard the stored frequency measurement configuration information or frequency measurement results. In an alternative method, the RRCRelease message may define an indicator to discard or maintain the frequency measurement configuration information or frequency measurement results, and may be set to only add, change or delete part of the stored frequency measurement configuration information.

[0343] ■2>UE stores or configures the frequency measurement configuration information set in the RRCRelease message, and performs or restarts the RRC idle mode or RRC inactive mode frequency measurement based on the information.

[0344] -1> If the system information of the cell on which the UE is camping indicates support for RRC idle mode or RRC inactive mode frequency measurement, or if the timer for frequency measurement is running (if the timer has not expired),

[0345] -1> Optionally, if the UE camps on or re-camps on a cell having a frequency or cell identifier included in the area configuration information for RRC idle mode or RRC inactive mode frequency measurement (configuration information set in an RRC message (e.g., RRCRelease)), or if a timer for frequency measurement is running (if the timer has not expired),

[0346] ■2> If the base station does not set the frequency measurement configuration information in the RRCRelease message, or if the UE does not receive the frequency measurement configuration (or frequency measurement list) in the RRCRelease message,

[0347] ◆3> The UE receives or obtains the frequency measurement configuration information of the RRC idle mode or RRC inactive mode frequency measurement in the system information (such as SIB5) of the resident cell, and stores it.

[0348] ◆3>UE performs or restarts RRC idle mode or RRC inactive mode frequency measurement according to the frequency measurement configuration information.

[0349] ■2> If the base station sets the frequency measurement configuration information in the RRCRelease message, if the UE receives the frequency measurement configuration (or frequency measurement list) in the RRCRelease message, or if the timer for the frequency measurement is running (if the timer has not expired),

[0350] ◆3>UE performs or restarts RRC idle mode or RRC inactive mode frequency measurement according to the frequency measurement configuration information set in the RRCRelease message.

[0351] -1> If the system information of the cell on which the UE is camped does not indicate support for RRC idle mode or RRC inactive mode frequency measurement, or if the timer for frequency measurement is running (if the timer has not expired),

[0352] -1> Alternatively, if the UE camps or re-camps on a cell having a frequency or cell identifier not included in the area configuration information for RRC idle mode or RRC inactive mode frequency measurement (configuration information set in an RRC message (e.g., RRCRelease)), or if a timer for frequency measurement is running (if the timer has not expired),

[0353] ■2>UE stops RRC idle mode or RRC inactive mode frequency measurement.

[0354] ■2>(The timer indicating the duration of frequency measurement is characterized by continuous operation.)

[0355] Fig.18 is a diagram illustrating an operation of a terminal performing frequency measurement and reporting a measurement result in an RRC idle mode or an RRC inactive mode according to an embodiment of the present disclosure.

[0356] exist Fig.18In the embodiment, upon receiving the RRC message, the UE drives the timer for RRC idle mode or RRC inactive mode frequency measurement, receives the frequency measurement configuration information for RRC idle mode or RRC inactive mode frequency measurement (if present in the RRC message) (18-05), or receives the frequency measurement configuration information in the system information of the serving cell on which the UE resides through the cell selection or reselection process (18-05), and performs RRC idle mode or RRC inactive mode frequency measurement (18-10). At this time, the UE can perform frequency measurement according to the first, second, third or fourth embodiment described above. Then, the UE stores the frequency measurement result, and if there is an indicator supporting RRC idle mode or RRC inactive mode frequency measurement in the system information of the cell, when establishing a connection with the network, the timer is stopped when message 4 is received (18-05), and the result of the RRC idle mode or RRC inactive mode frequency measurement is notified through message 5. Then, when the base station requests the result of the RRC idle mode or RRC inactive mode frequency measurement, the UE reports the measurement result (18-20), and when the measurement result is successfully transmitted to the base station, the measurement result may be discarded.

[0357] Fig.19 is a signal diagram showing the structure of a terminal according to an embodiment of the present disclosure.

[0358] refer to Fig.19 , the terminal (ie, UE) may include a radio frequency (RF) processor 19-10, a baseband processor 19-20, a memory 19-30, and a controller 19-40.

[0359] The RF processor 19-10 performs functions such as frequency band conversion and amplification of signals sent and received through wireless channels. That is, the RF processor 19-10 up-converts the baseband signal provided by the baseband processor 19-20 to an RF band signal, transmits the RF band signal via an antenna, and down-converts the RF band signal received via the antenna to a baseband signal. For example, the RF processor 19-10 may include a transmit filter, a receive filter, an amplifier, a mixer, an oscillator, a digital-to-analog converter (DAC), an analog-to-digital converter (ADC), etc. Although only a single antenna is shown in the figure, the terminal may include multiple antennas. In addition, the RF processor 19-10 may include multiple RF chains. In addition, the RF processor 19-10 may perform beamforming. For beamforming, the RF processor 19-10 may control the phase and size of each signal sent or received via multiple antennas or antenna elements. In addition, the RF processor may perform MIMO and may receive multiple layers while performing MIMO operations. The RF processor 19 - 10 may appropriately configure a plurality of antennas or antenna elements according to the control of the controller so as to perform receive beam scanning, or may control the direction and beam width of the receive beam so that the receive beam is consistent with the transmit beam.

[0360] The baseband processor 19-20 performs the conversion function between the baseband signal and the bit stream according to the physical layer standard of the system. For example, in the case of data transmission, the baseband processor 19-20 generates complex symbols by encoding and modulating the transmission bit stream. In addition, in the case of data reception, the baseband processor 19-20 reconstructs the received bit stream by demodulating and decoding the baseband signal provided from the RF processor 19-10. For example, in the case of data transmission, according to the OFDM (Orthogonal Frequency Division Multiplexing) scheme, the baseband processor 19-20 generates complex symbols by encoding and modulating the transmission bit stream, maps the complex symbols to subcarriers, and then configures the OFDM symbols via the inverse fast Fourier transform (IFFT) operation and the cyclic prefix (CP) insertion. In addition, in the case of data reception, the baseband processor 19-20 divides the baseband signal provided from the RF processor 19-10 in units of OFDM symbols, reconstructs the signal mapped to the subcarrier via the fast Fourier transform (FFT) operation, and then reconstructs the received bit stream via demodulation and decoding.

[0361] As described above, the baseband processor 19-20 and the RF processor 19-10 send or receive signals. Therefore, the baseband processor 19-20 and the RF processor 19-10 can be referred to as a transmitter, a receiver, a transceiver or a communication unit. In addition, at least one of the baseband processor 19-20 and the RF processor 19-10 may include multiple communication modules to support many different radio access technologies. In addition, at least one of the baseband processor 19-20 and the RF processor 19-10 may include different communication modules to process signals of different frequency bands. For example, different radio access technologies may include LTE networks, NR networks, etc. In addition, different frequency bands may include ultra-high frequency (SHF) (e.g., 2.5 GHz and 5 GHz) bands and millimeter (mm) wave (e.g., 60 GHz) bands.

[0362] The memory 19-30 stores data such as basic programs, application programs, and configuration information for terminal operation. The memory 19-30 can provide the stored data in response to a request from the controller 19-40.

[0363] The controller 19-40 may include a multi-connection processor 19-42, and may control the overall operation of the terminal. For example, the controller 19-40 sends or receives a signal through the baseband processor 19-20 and the RF processor 19-10. In addition, the controller 19-40 writes and reads data to / from the memory 19-40. To this end, the controller 19-40 may include at least one processor. For example, the controller 19-40 may include a communication processor (CP) that performs communication control, and an application processor (AP) that controls a higher layer such as an application.

[0364] Fig. 20 is a block diagram showing the structure of a base station in a wireless communication system according to an embodiment of the present disclosure.

[0365] refer to Fig. 20 , the base station may include an RF processor 20 - 10, a baseband processor 20 - 20, a backhaul communication unit 20 - 30, a memory 20 - 40, and a controller 20 - 50.

[0366] The RF processor 20-10 performs functions such as frequency band conversion and amplification of signals sent or received through a wireless channel. For example, the RF processor 20-10 up-converts the baseband signal provided by the baseband processor 20-20 to an RF band signal, then transmits the converted signal via an antenna, and down-converts the RF band signal received via the antenna to a baseband signal. For example, the RF processor 20-10 may include a transmit filter, a receive filter, an amplifier, a mixer, an oscillator, a DAC, and an ADC. Although only a single antenna is shown in the figure, the first access node may include multiple antennas. In addition, the RF processor 20-10 may include multiple RF chains. In addition, the RF processor 20-10 may perform beamforming. For beamforming, the RF processor 20-10 may control the phase and size of each signal sent or received via multiple antennas or antenna elements. The RF processor may perform downlink MIMO operations by sending one or more layers.

[0367] The baseband processor 20-20 performs the function of converting between the baseband signal and the bit stream according to the physical layer standard of the first radio access technology. For example, in the case of data transmission, the baseband processor 20-20 generates complex symbols by encoding and modulating the transmission bit stream. In addition, in the case of data reception, the baseband processor 20-20 reconstructs the received bit stream by demodulating and decoding the baseband signal provided from the RF processor 20-10. For example, in the case of data transmission, according to the OFDM scheme, the baseband processor 20-20 can generate complex symbols by encoding and modulating the transmission bit stream, map the complex symbols to subcarriers, and then configure the OFDM symbols via IFFT operations and CP insertion. In addition, in the case of data reception, the baseband processor 20-20 divides the baseband signal provided from the RF processor 20-10 in units of OFDM symbols, reconstructs the signal mapped to the subcarrier by FFT operations, and then reconstructs the received bit string by demodulation and decoding. As described above, the baseband processor 20-20 and the RF processor 20-10 send or receive signals. Therefore, the baseband processor 20 - 20 and the RF processor 20 - 10 may be referred to as a transmitter, a receiver, a transceiver, a communication unit, or a wireless communication unit.

[0368] The communication units 20-30 provide interfaces for performing communications with other nodes in the network.

[0369] The memory 20-40 may store data for the operation of the master base station, such as basic programs, applications, configuration information, etc. In particular, the memory 20-40 may store information associated with the bearer assigned to the connection terminal, measurement results reported from the connection terminal, etc. In addition, the memory 20-40 may store information as a criterion for determining whether to provide or interrupt multiple access to the terminal. In addition, the memory 20-40 may provide stored data in response to a request from the controller 20-50.

[0370] The controller 20-50 may include a multi-connection processor 20-52 and may control the overall operation of the master base station. For example, the controller 20-50 sends or receives a signal via the baseband processor 20-20 and the RF processor 20-10 or via the backhaul communication unit 20-30. In addition, the controller 20-50 writes and reads data to / from the memory 20-40. To this end, the controller 20-50 may include at least one processor.

[0371] Although the present disclosure has been described with various embodiments, various changes and modifications may be suggested to one skilled in the art. The present disclosure is intended to encompass such changes and modifications as fall within the scope of the appended claims.

Claims

1. A method performed by a terminal in a communication system, the method comprising: receiving a radio resource control (RRC) release message including first information; In a case where the first information includes a first frequency of the first frequency list and a synchronization signal block SSB configuration of the first frequency, when the terminal is in an RRC idle mode or an RRC inactive mode, performing a first measurement of the first frequency based on the SSB configuration of the first frequency included in the first information; as well as In a case where the first information includes a first frequency of a first frequency list and does not include an SSB configuration of the first frequency, when the terminal is in an RRC idle mode or an RRC inactive mode, a second measurement of the first frequency is performed based on the SSB configuration of the first frequency included in the second information, wherein the second information is received via a system information block SIB.

2. The method according to claim 1, wherein: The SSB configuration included in the first information or the second information includes at least one of information about a period, a duration, and an offset associated with the SSB.

3. The method according to claim 1, wherein: Performing a first measurement includes: Identifying that an SSB configuration of the first frequency is included in the first information; and According to the identifying, a first measurement of the first frequency is performed based on the SSB configuration included in the first information.

4. The method according to claim 1, wherein: Performing the second measurement includes: identifying that an SSB configuration of a first frequency is not included in the first information, the first frequency is included in a second frequency list, and the SSB configuration of the first frequency is included in second information received through a SIB, wherein the second frequency list is included in the second information received through the SIB; and In accordance with the identifying, a second measurement of the first frequency is performed based on the SSB configuration included in the second information.

5. The method according to claim 1, wherein: The measuring is performed based on a reference timing of the selected cell in the RRC idle mode or the RRC inactive mode.

6. The method according to claim 1, in, The measuring is performed while a timer started based on the first information is running, and The first information includes information about a duration associated with the operation of the timer.

7. The method according to claim 1, further comprising: In a case where the first information includes neither a frequency list of Long Term Evolution LTE nor a frequency list of New Radio NR, performing, when the terminal is in an RRC idle mode or an RRC inactive mode, a third measurement of a second frequency of a second frequency list based on an SSB configuration of the second frequency included in the second information, wherein the second frequency list is included in the second information received through the SIB, The first frequency list and the second frequency list are associated with the frequency list of the NR.

8. A terminal in a communication system, the terminal comprising: Transceiver; and The controller is configured as: receiving a radio resource control (RRC) release message including first information, In a case where the first information includes a first frequency of the first frequency list and a synchronization signal block SSB configuration of the first frequency, when the terminal is in RRC idle mode or RRC inactive mode, performing a first measurement of the first frequency based on the SSB configuration of the first frequency included in the first information, and In a case where the first information includes a first frequency of a first frequency list and does not include an SSB configuration of the first frequency, when the terminal is in an RRC idle mode or an RRC inactive mode, a second measurement of the first frequency is performed based on the SSB configuration of the first frequency included in the second information, wherein the second information is received via a system information block SIB.

9. The terminal according to claim 8, wherein: The SSB configuration included in the first information or the second information includes at least one of information about a period, a duration, and an offset associated with the SSB.

10. The terminal according to claim 8, wherein: The controller is also configured to: Identifying that an SSB configuration of the first frequency is included in the first information; and According to the identifying, a first measurement of the first frequency is performed based on the SSB configuration included in the first information.

11. The terminal according to claim 8, wherein: The controller is also configured to: identifying that an SSB configuration of a first frequency is not included in the first information, the first frequency is included in a second frequency list, and the SSB configuration of the first frequency is included in the second information, wherein the second frequency list is included in the second information received through the SIB; and In accordance with the identifying, a second measurement of the first frequency is performed based on the SSB configuration included in the second information.

12. The terminal according to claim 8, wherein: The measuring is performed based on a reference timing of the selected cell in the RRC idle mode or the RRC inactive mode.

13. The terminal according to claim 8, in, The measuring is performed while a timer started based on the first information is running, and The first information includes information about a duration associated with the operation of the timer.

14. The terminal according to claim 8, wherein: The controller is also configured to: In a case where the first information includes neither a frequency list of Long Term Evolution LTE nor a frequency list of New Radio NR, performing, when the terminal is in an RRC idle mode or an RRC inactive mode, a third measurement of a second frequency of a second frequency list based on an SSB configuration of a second frequency included in the second information, wherein the second frequency list is included in the second information received through the SIB, The first frequency list and the second frequency list are associated with the frequency list of the NR.

15. A method performed by a base station in a communication system, the method comprising: sending a radio resource control RRC release message including the first information, Wherein, in a case where the first information includes a first frequency of the first frequency list and a synchronization signal block SSB configuration of the first frequency, when the terminal is in an RRC idle mode or an RRC inactive mode, a first measurement of the first frequency is performed by the terminal based on the SSB configuration of the first frequency included in the first information, and In which, when the first information includes the first frequency of the first frequency list and does not include the SSB configuration of the first frequency, when the terminal is in RRC idle mode or RRC inactive mode, the second measurement of the first frequency is performed based on the SSB configuration of the first frequency included in the second information, wherein the second information is sent via the system information block SIB.

16. The method according to claim 15, wherein: The SSB configuration included in the first information or the second information includes at least one of information about a period, a duration, and an offset associated with the SSB.

17. The method according to claim 15, wherein: The first information includes information about a duration associated with the timer running, and The measurement is performed while a timer started based on the first information is running.

18. The method according to claim 15, wherein: The measuring is performed based on a reference timing of the selected cell in the RRC idle mode or the RRC inactive mode.

19. A base station in a communication system, the base station comprising: Transceiver; and The controller is configured as: sending a radio resource control RRC release message including the first information, Wherein, in a case where the first information includes a first frequency of the first frequency list and a synchronization signal block SSB configuration of the first frequency, when the terminal is in an RRC idle mode or an RRC inactive mode, a first measurement of the first frequency is performed by the terminal based on the SSB configuration of the first frequency included in the first information, and In which, when the first information includes the first frequency of the first frequency list and does not include the SSB configuration of the first frequency, when the terminal is in RRC idle mode or RRC inactive mode, the second measurement of the first frequency is performed based on the SSB configuration of the first frequency included in the second information, wherein the second information is sent via the system information block SIB.

20. The base station according to claim 19, wherein: The SSB configuration included in the first information or the second information includes at least one of information about a period, a duration, and an offset associated with the SSB.

21. The base station according to claim 19, wherein: The first information includes information about a duration associated with the timer running, and The measurement is performed while a timer started based on the first information is running.

22. The base station according to claim 19, wherein: The measuring is performed based on a reference timing of the selected cell in the RRC idle mode or the RRC inactive mode.

Images