Method and apparatus for reporting measurement-related information in mobile communication system

Abstract

The present disclosure relates to a 5G or 6G communication system for supporting a higher data transmission rate. The present disclosure relates to a method performed by a terminal in a wireless communication system, the method comprising the steps of: receiving measurement configuration information from a base station; if time information indicating a period for storing a measurement result for a measurement report is included in the measurement configuration information, storing, on the basis of the period, the measurement result to which layer 3 filtering is applied and which is measured on the basis of the measurement configuration information; determining whether a measurement report event has occurred; and if the measurement report event has occurred, transmitting, to the base station, cell measurement history information including the measurement result, wherein the cell measurement history information includes a plurality of measurement results to which the layer 3 filtering is applied.

Description

Method and device for reporting measurement-related information in a mobile communication system

[0001] The present disclosure relates to the operation of a terminal and a base station in a mobile communication system. The present disclosure also relates to a method and device for reporting measurement-related information (e.g., measurement result history information) in a mobile communication system.

[0002] 5G mobile communication technology defines a wide frequency band to enable fast transmission speeds and new services, and can be implemented not only in the sub-6GHz frequency band such as 3.5 gigahertz (3.5GHz), but also in the ultra-high frequency band called millimeter wave (mmWave) such as 28GHz and 39GHz ('Above 6GHz'). In addition, for 6G mobile communication technology, which is called the system after 5G communication (Beyond 5G), implementation in the terahertz band (for example, the 3 terahertz (3THz) band at 95GHz) is being considered to achieve a transmission speed that is 50 times faster than 5G mobile communication technology and an ultra-low latency time that is reduced to one-tenth.

[0003] In the early stages of 5G mobile communication technology, the goal is to support services and satisfy performance requirements for enhanced Mobile Broadband (eMBB), Ultra-Reliable Low-Latency Communications (URLLC), and massive Machine-Type Communications (mMTC). These include beamforming and massive MIMO to mitigate path loss of radio waves in ultra-high frequency bands and increase the transmission distance of radio waves, support for various numerologies (such as operation of multiple subcarrier intervals) and dynamic operation of slot formats for efficient use of ultra-high frequency resources, initial access technology to support multi-beam transmission and wideband, definition and operation of BWP (Bidth Part), new channel coding methods such as LDPC (Low Density Parity Check) codes for large-capacity data transmission and Polar Code for reliable transmission of control information, and L2 pre-processing (L2). Standardization has been made for network slicing, which provides dedicated networks specialized for specific services, and pre-processing.

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

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

[0006] Once these 5G mobile communication systems are commercialized, an explosive increase in connected devices will be connected to the communication network, necessitating enhanced functionality and performance of 5G mobile communication systems and integrated operation of these connected devices. To this end, new research will be conducted on improving 5G performance and reducing complexity, supporting AI services, supporting metaverse services, and drone communications by utilizing eXtended Reality (XR), Artificial Intelligence (AI), and Machine Learning (ML) to efficiently support Augmented Reality (AR), Virtual Reality (VR), and Mixed Reality (MR).

[0007] In addition, the development of these 5G mobile communication systems includes new waveforms to ensure coverage in the terahertz band of 6G mobile communication technology, multi-antenna transmission technologies such as Full Dimensional MIMO (FD-MIMO), Array Antenna, and Large Scale Antenna, metamaterial-based lenses and antennas to improve the coverage of terahertz band signals, high-dimensional spatial multiplexing technology using Orbital Angular Momentum (OAM), Reconfigurable Intelligent Surface (RIS) technology, as well as full duplex technology to improve the frequency efficiency and system network of 6G mobile communication technology, satellite, AI (Artificial Intelligence) from the design stage and AI-based communication technology that realizes system optimization by internalizing end-to-end AI support functions, and ultra-high-performance communication and computing resources to provide services with complexity that exceeds the limits of terminal computing capabilities. It can serve as a basis for the development of next-generation distributed computing technologies that can be realized by utilizing them.

[0008] The present disclosure provides various embodiments for the efficient operation of terminals and base stations in a mobile communication system.

[0009] Various embodiments of the present disclosure aim to improve measurement-related operations to enhance the operation of terminals and base stations, and to provide methods and devices for reporting improved measurement-related information (e.g., measurement result history information).

[0010] According to one embodiment of the present disclosure, a method performed by a terminal in a wireless communication system may be provided, comprising: receiving measurement configuration information from a base station; if the measurement configuration information includes time information indicating a period for storing measurement results for a measurement report, storing a measurement result to which layer 3 filtering is applied based on the measurement configuration information based on the period; determining whether a measurement report event has occurred; and if the measurement report event has occurred, transmitting cell measurement history information including the measurement result to the base station, wherein the cell measurement history information includes a plurality of measurement results to which layer 3 filtering is applied.

[0011] In addition, according to one embodiment of the present disclosure, a method performed by a base station in a wireless communication system may include the steps of: receiving terminal performance information indicating whether to support storage or reporting of cell measurement history information from a terminal; transmitting measurement configuration information to the terminal based on the terminal performance information; and, if the measurement configuration information includes time information indicating a cycle for storing measurement results for a measurement report, receiving the cell measurement history information including measurement results to which layer 3 filtering is applied and stored based on the cycle, wherein the cell measurement history information includes a plurality of measurement results to which layer 3 filtering is applied.

[0012] In addition, according to one embodiment of the present disclosure, a terminal of a wireless communication system includes a transceiver and a control unit, wherein the control unit receives measurement configuration information from a base station, and if the measurement configuration information includes time information indicating a period for storing measurement results for a measurement report, stores a measurement result to which layer 3 filtering is applied based on the measurement configuration information based on the period, determines whether a measurement report event has occurred, and if the measurement report event has occurred, controls to transmit cell measurement history information including the measurement result to the base station, and the cell measurement history information can provide a terminal including a plurality of measurement results to which layer 3 filtering is applied.

[0013] In addition, according to one embodiment of the present disclosure, a base station of a wireless communication system includes a transceiver and a control unit, wherein the control unit receives terminal performance information indicating whether to support storage or reporting of cell measurement history information from a terminal, transmits measurement configuration information to the terminal based on the terminal performance information, and if the measurement configuration information includes time information indicating a period for storing measurement results for a measurement report, controls to receive the cell measurement history information including measurement results to which layer 3 filtering is applied stored based on the period, and the cell measurement history information can provide a base station including a plurality of measurement results to which layer 3 filtering is applied.

[0014] According to various embodiments of the present disclosure, efficient operation of a terminal and a base station in a mobile communication system can be provided.

[0015] Additionally, various embodiments of the present disclosure may provide improved measurement-related operations to enhance the operation of terminals and base stations.

[0016] Additionally, according to various embodiments of the present disclosure, a method and device for reporting improved measurement-related information (e.g., measurement result history information) can be provided.

[0017] FIG. 1 is a diagram illustrating the structure of an LTE system according to one embodiment of the present disclosure.

[0018] FIG. 2 is a diagram illustrating a wireless protocol structure in an LTE system according to an embodiment of the present disclosure.

[0019] FIG. 3 is a diagram illustrating the structure of a next-generation mobile communication system according to an embodiment of the present disclosure.

[0020] FIG. 4 is a diagram illustrating a wireless protocol structure of a next-generation mobile communication system according to an embodiment of the present disclosure.

[0021] FIG. 5 is a flowchart of a process in which a terminal transmits a measurement result message to a base station in a next-generation mobile communication system according to an embodiment of the present disclosure.

[0022] FIG. 6 is a flowchart of a process in which a terminal transmits a measurement result message to a base station in a next-generation mobile communication system according to an embodiment of the present disclosure.

[0023] FIG. 7 is a flowchart of a process in which a terminal transmits a measurement result message to a base station in a next-generation mobile communication system according to an embodiment of the present disclosure.

[0024] FIG. 8 is a flowchart of a process in which a terminal transmits a measurement result message to a base station in a next-generation mobile communication system according to an embodiment of the present disclosure.

[0025] FIG. 9 is a flowchart of a process in which a terminal transmits a measurement result message to a base station in a next-generation mobile communication system according to an embodiment of the present disclosure.

[0026] FIG. 10 is a flowchart of a process in which a terminal transmits a measurement result message to a base station in a next-generation mobile communication system according to an embodiment of the present disclosure.

[0027] FIG. 11 is a flowchart of a process in which a terminal transmits a measurement result message to a base station in a next-generation mobile communication system according to an embodiment of the present disclosure.

[0028] FIG. 12 is a diagram illustrating a configuration of a terminal according to an embodiment of the present disclosure.

[0029] FIG. 13 is a diagram illustrating a configuration of a base station according to an embodiment of the present disclosure.

[0030] Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the attached drawings. It should be noted that, where possible, identical components are represented by identical reference numerals throughout the attached drawings. Furthermore, detailed descriptions of well-known functions and configurations that may obscure the gist of the present invention will be omitted.

[0031] In describing the embodiments herein, descriptions of technical details that are well-known in the technical field to which the present invention pertains and are not directly related to the present invention will be omitted. This is to avoid obscuring the gist of the present invention by omitting unnecessary explanations and to convey the gist more clearly.

[0032] For the same reason, some components in the attached drawings are exaggerated, omitted, or schematically depicted. Furthermore, the dimensions of each component do not entirely reflect its actual size. Identical or corresponding components in each drawing are assigned the same reference numbers.

[0033] The advantages and features of the present invention, and the methods for achieving them, will become clearer with reference to the embodiments described in detail below together with the accompanying drawings. However, the present invention is not limited to the embodiments disclosed below and may be implemented in various different forms. These embodiments are provided only to ensure that the disclosure of the present invention is complete and to fully inform those skilled in the art of the scope of the invention, and the present invention is defined only by the scope of the claims. Like reference numerals designate like elements throughout the specification.

[0034] At this time, it will be understood that each block of the processing flow diagrams and combinations of the flow diagrams can be performed by computer program instructions. These computer program instructions can be installed in a processor of a general-purpose computer, a special-purpose computer, or other programmable data processing equipment, so that the instructions executed by the processor of the computer or other programmable data processing equipment create a means for performing the functions described in the flow diagram block(s). These computer program instructions can also be stored in a computer-available or computer-readable memory that can direct a computer or other programmable data processing equipment to implement the functions in a specific manner, so that the instructions stored in the computer-available or computer-readable memory can also produce a manufactured item that includes an instruction means for performing the functions described in the flow diagram block(s). Since the computer program instructions may be installed on a computer or other programmable data processing device, a series of operational steps may be performed on the computer or other programmable data processing device to create a computer-executable process, and the instructions that cause the computer or other programmable data processing device to perform the steps for performing the functions described in the flowchart block(s) may also provide steps for performing the functions described in the flowchart block(s).

[0035] Additionally, each block may represent a module, segment, or portion of code that contains one or more executable instructions for performing a specific logical function(s). It should also be noted that in some alternative implementation examples, the functions described in the blocks may occur out of order. For example, two blocks depicted in succession may actually be executed substantially concurrently, or the blocks may sometimes be executed in reverse order, depending on their respective functions.

[0036] Here, the term '~ unit' used in the present embodiment means a software or hardware component such as an FPGA or ASIC, and the '~ unit' performs certain roles. However, the '~ unit' is not limited to software or hardware. The '~ unit' may be configured to be on an addressable storage medium and may be configured to play one or more processors. Accordingly, as an example, the '~ unit' includes components such as software components, object-oriented software components, class components, and task components, processes, functions, properties, procedures, subroutines, segments of program code, drivers, firmware, microcode, circuits, data, databases, data structures, tables, arrays, and variables. The functions provided within the components and '~ units' may be combined into a smaller number of components and '~ units' or further separated into additional components and '~ units'. Additionally, components and '~parts' may be implemented to regenerate one or more CPUs within a device or secure multimedia card.

[0037] Hereinafter, the base station is an entity that performs resource allocation of the terminal, and may be at least one of a Node B, a BS (Base Station), an eNB (eNode B), a gNB (gNode B), a wireless access unit, a base station controller, or a node on a network. The terminal may include a UE (User Equipment), an MS (Mobile Station), a cellular phone, a smartphone, a computer, or a multimedia system capable of performing a communication function. In addition, the embodiments of the present disclosure may be applied to other communication systems having a similar technical background or channel type to the embodiments of the present disclosure described below. In addition, the embodiments of the present disclosure may be applied to other communication systems with some modifications without significantly departing from the scope of the present disclosure at the discretion of a person having skilled technical knowledge. For example, the 5th generation mobile communication technology (5G, new radio, NR) developed after LTE-A may be included here, and the 5G below may also be a concept that includes existing LTE, LTE-A, and other similar services. In addition, the present disclosure may be applied to other communication systems with some modifications within a scope that does not significantly deviate from the scope of the present disclosure, as judged by a person having skilled technical knowledge.

[0038] In the following description, terms used to identify connection nodes, terms referring to network entities or network functions (NFs), terms referring to messages, terms referring to interfaces between network objects, terms referring to various identification information, etc. are examples provided for convenience of explanation. Therefore, the present invention is not limited to the terms described below, and other terms referring to objects having equivalent technical meanings may be used.

[0039] For the convenience of the following description, some terms and names defined in the 3rd generation partnership project (3GPP) LTE (long term evolution) standard and / or 3GPP NR (new radio) standard may be used. However, the present invention is not limited by the above terms and names, and may be equally applied to systems conforming to other standards. In the present disclosure, eNB may be used interchangeably with gNB for the convenience of description. That is, a base station described as an eNB may represent a gNB. In various embodiments of the present disclosure, eNB, gNB, and NW (network) may all be defined as base stations.

[0040] In various embodiments of the present disclosure, a terminal may refer to a MUSIM terminal, and a MUSIM terminal may refer to a terminal that supports a MUSIM function. Furthermore, in various embodiments of the present disclosure, the terms terminal and MUSIM terminal may be used interchangeably. Furthermore, in the present disclosure, a terminal that uses each USIM in a terminal including multiple USIMs may be referred to as a terminal. For example, if a MUSIM terminal includes USIM 1, USIM 2, ..., USIM n, a terminal using USIM 1 may be referred to as a first terminal, a terminal using USIM 2 may be referred to as a second terminal, and a terminal using USIM n may be referred to as an n terminal.

[0041] FIG. 1 is a diagram illustrating the structure of an LTE system according to one embodiment of the present disclosure.

[0042] Referring to FIG. 1, as illustrated, the wireless access network of the LTE system is composed of next-generation base stations (Evolved Node Bs, hereinafter ENBs, Node Bs or base stations) (1-05, 1-10, 1-15, 1-20), MMEs (1-25, Mobility Management Entity) and S-GWs (1-30, Serving-Gateway). User equipment (UEs, hereinafter UEs or terminals) (1-35) access external networks through ENBs (1-05, 1-10, 1-15, 1-20) and S-GWs (1-30).

[0043] In Fig. 1, ENBs (1-05, 1-10, 1-15, 1-20) correspond to existing Node Bs of the UMTS (Universal Mobile Telecommunication System) system. ENBs are connected to UEs (1-35) via a wireless channel and perform a more complex role than existing Node Bs. In the LTE system, all user traffic, including real-time services such as VoIP (Voice over IP) via the Internet Protocol, is serviced through a shared channel. Therefore, a device that collects status information such as the buffer status of UEs, available transmission power status, and channel status and performs scheduling is required, and ENBs (1-05, 1-10, 1-15, 1-20) are in charge of this. One ENB typically controls multiple cells. For example, in order to implement a transmission speed of 100 Mbps, the LTE system uses, for example, orthogonal frequency division multiplexing (OFDM) as a wireless access technology in a 20 MHz bandwidth. In addition, it applies Adaptive Modulation & Coding (AMC) method that determines modulation scheme and channel coding rate based on the channel status of the terminal. S-GW (1-30) is a device that provides data bearers and creates or removes data bearers according to the control of MME (1-25). MME (1-25) is a device that is responsible for mobility management function for terminals as well as various control functions and is connected to multiple base stations.

[0044] FIG. 2 is a diagram illustrating a wireless protocol structure in an LTE system according to an embodiment of the present disclosure.

[0045] Referring to Figure 2, the wireless protocol of the LTE system consists of PDCP (Packet Data Convergence Protocol 2-05, 2-40), RLC (Radio Link Control 2-10, 2-35), and MAC (Medium Access Control 2-15, 2-30) in the terminal and ENB, respectively. PDCP (Packet Data Convergence Protocol) (2-05, 2-40) is responsible for operations such as IP header compression / decompression. The main functions of PDCP are summarized as follows.

[0046] - Header compression and decompression (ROHC only)

[0047] - User data transfer function

[0048] - In-sequence delivery of upper layer PDUs at PDCP re-establishment procedure for RLC AM

[0049] - Order reordering function (For split bearers in DC (only support for RLC AM): PDCP PDU routing for transmission and PDCP PDU reordering for reception)

[0050] - Duplicate detection function (Duplicate detection of lower layer SDUs at PDCP re-establishment procedure for RLC AM)

[0051] - Retransmission function (Retransmission of PDCP SDUs at handover and, for split bearers in DC, of ​​PDCP PDUs at PDCP data-recovery procedure, for RLC AM)

[0052] - Encryption and decryption functions (Ciphering and deciphering)

[0053] - Timer-based SDU discard in uplink.

[0054] Radio Link Control (RLC) (2-10, 2-35) reconfigures PDCP PDUs (Packet Data Units) to an appropriate size and performs ARQ operations, etc. The main functions of RLC are summarized as follows.

[0055] - Data transfer function (Transfer of upper layer PDUs)

[0056] - ARQ function (Error Correction through ARQ (only for AM data transfer))

[0057] - Concatenation, segmentation and reassembly of RLC SDUs (only for UM and AM data transfer)

[0058] - Re-segmentation of RLC data PDUs (only for AM data transfer)

[0059] - Reordering of RLC data PDUs (only for UM and AM data transfer)

[0060] - Duplicate detection (only for UM and AM data transfer)

[0061] - Error detection function (Protocol error detection (only for AM data transfer))

[0062] - RLC SDU discard function (RLC SDU discard (only for UM and AM data transfer))

[0063] - RLC re-establishment function

[0064] MAC (2-15, 2-30) connects to multiple RLC layer devices configured in a single terminal, and multiplexes RLC PDUs into MAC PDUs and demultiplexes RLC PDUs from MAC PDUs. The main functions of MAC are summarized as follows.

[0065] - Mapping function (Mapping between logical channels and transport channels)

[0066] - Multiplexing and demultiplexing function (Multiplexing / demultiplexing of MAC SDUs belonging to one or different logical channels into / from transport blocks (TB) delivered to / from the physical layer on transport channels)

[0067] - Scheduling information reporting function

[0068] - HARQ function (Error correction through HARQ)

[0069] - Priority handling between logical channels of one UE

[0070] - Priority handling between UEs by means of dynamic scheduling

[0071] - MBMS service identification function

[0072] - Transport format selection function

[0073] - Padding function

[0074] The physical layer (2-20, 2-25) performs the operation of channel coding and modulating upper layer data, converting it into OFDM symbols and transmitting it through a wireless channel, or demodulating and channel decoding OFDM symbols received through a wireless channel and transmitting them to the upper layer.

[0075] In Fig. 3, the NR gNB (3-10) corresponds to the eNB (Evolved Node B) of the existing LTE system. The NR gNB is connected to the NR UE (3-15) via a wireless channel and can provide a service that is superior to the existing Node B. In the next-generation mobile communication system, all user traffic is serviced through a shared channel, so a device that collects status information such as the buffer status of UEs, available transmission power status, and channel status and performs scheduling is required, and the NR NB (3-10) is in charge of this. One NR gNB typically controls multiple cells. In order to implement ultra-high-speed data transmission compared to the current LTE, it can have a bandwidth higher than the existing maximum, and beamforming technology can be additionally grafted using the orthogonal frequency division multiplexing (OFDM) as a wireless access technology. In addition, it applies the Adaptive Modulation & Coding (AMC) method that determines the modulation scheme and channel coding rate based on the channel status of the terminal. NR CN (3-05) performs functions such as mobility support, bearer setup, and QoS (quality of service) setup. NR CN (3-05) is a device that is responsible for various control functions as well as mobility management functions for the terminal and is connected to multiple base stations. In addition, the next-generation mobile communication system can also be linked with the existing LTE system, and NR CN (3-05) is connected to MME (3-25) through a network interface. MME (3-25) is connected to eNB (3-30), which is an existing base station.

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

[0077] FIG. 4 is a diagram showing a wireless protocol structure of a next-generation mobile communication system to which the present disclosure can be applied.

[0078] Referring to FIG. 4, the wireless protocol of the next-generation mobile communication system consists of NR SDAP (4-01, 4-45), NR PDCP (4-05, 4-40), NR RLC (4-10, 4-35), and NR MAC (4-15, 4-30) in the terminal and NR base station, respectively.

[0079] Key features of NR SDAP (4-01, 4-45) may include some of the following:

[0080] - Transfer of user plane data

[0081] - Mapping function between QoS flow and data bearer for both DL and UL

[0082] - QoS flow ID marking function for uplink and downlink (marking QoS flow ID in both DL and UL packets)

[0083] - Ability to map relective QoS flow to data bearer for uplink SDAP PDUs (reflective QoS flow to DRB mapping for the UL SDAP PDUs).

[0084] For the above SDAP layer device, the terminal can be configured by RRC message for each PDCP layer device, each bearer, or each logical channel, whether to use the header of the SDAP layer device or whether to use the function of the SDAP layer device, and when the SDAP header is configured, the terminal can be instructed to update or reset the mapping information for the QoS flow and data bearer of the uplink and downlink with the NAS QoS reflection configuration 1-bit indicator (NAS reflective QoS) and the AS QoS reflection configuration 1-bit indicator (AS reflective QoS) of the SDAP header. The SDAP header can include QoS flow ID information indicating QoS. The QoS information can be used as data processing priority, scheduling information, etc. to support a smooth service.

[0085] The main functions of NR PDCP (4-05, 4-40) may include some of the following functions:

[0086] Header compression and decompression (ROHC only)

[0087] - User data transfer function

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

[0089] - Out-of-sequence delivery of upper layer PDUs

[0090] - PDCP PDU reordering for reception

[0091] - Duplicate detection of lower layer SDUs

[0092] - Retransmission function (Retransmission of PDCP SDUs)

[0093] - Encryption and decryption functions (Ciphering and deciphering)

[0094] - Timer-based SDU discard in uplink.

[0095] The reordering function of the NR PDCP device above refers to a function of reordering PDCP PDUs received from a lower layer in order based on the PDCP SN (sequence number), and may include a function of transmitting data to an upper layer in the reordered order, or may include a function of transmitting data directly without considering the order, may include a function of recording lost PDCP PDUs by reordering the order, may include a function of reporting the status of lost PDCP PDUs to the transmitting side, and may include a function of requesting retransmission of lost PDCP PDUs.

[0096] The main functions of NR RLC(4-10, 4-35) may include some of the following functions:

[0097] - Data transfer function (Transfer of upper layer PDUs)

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

[0099] - Out-of-sequence delivery of upper layer PDUs

[0100] - ARQ function (Error Correction through ARQ)

[0101] - Concatenation, segmentation and reassembly of RLC SDUs

[0102] - Re-segmentation of RLC data PDUs

[0103] - Reordering of RLC data PDUs

[0104] - Duplicate detection function

[0105] - Protocol error detection

[0106] - RLC SDU discard function

[0107] - RLC re-establishment function

[0108] The in-sequence delivery function of the NR RLC device above refers to the function of sequentially transmitting RLC SDUs received from a lower layer to an upper layer, and may include a function of reassembling and transmitting RLC SDUs when an RLC SDU is originally received divided into multiple RLC SDUs, may include a function of reordering received RLC PDUs based on RLC SN (sequence number) or PDCP SN (sequence number), may include a function of recording lost RLC PDUs by reordering the sequence, may include a function of reporting the status of lost RLC PDUs to the transmitting side, may include a function of requesting retransmission of lost RLC PDUs, may include a function of sequentially transmitting only RLC SDUs up to the lost RLC SDU to an upper layer when there is a lost RLC SDU, or may include a function of sequentially transmitting all RLC SDUs received before the timer starts when a predetermined timer expires even when there is a lost RLC SDU. Or, even if there are lost RLC SDUs, if a predetermined timer has expired, it may include a function to sequentially deliver all RLC SDUs received up to the upper layer. In addition, the RLC PDUs may be processed in the order they are received (in the order of arrival, regardless of the order of the sequence number) and delivered to the PDCP device out of sequence (out-of-sequence delivery). In the case of segments, the segments stored in the buffer or to be received later may be received, reconstructed into a single complete RLC PDU, processed, and then delivered to the PDCP device.The above NR RLC layer may not include a concatenation function, and the above function may be performed in the NR MAC layer or replaced with a multiplexing function of the NR MAC layer.

[0109] The out-of-sequence delivery function of the NR RLC device above refers to the function of directly delivering RLC SDUs received from a lower layer to an upper layer regardless of the order, and may include a function of reassembling and delivering RLC SDUs when an original RLC SDU is received divided into multiple RLC SDUs, and may include a function of storing the RLC SN or PDCP SN of received RLC PDUs and arranging the order to record lost RLC PDUs.

[0110] NR MAC (4-15, 4-30) can be connected to multiple NR RLC layer devices configured in one terminal, and the main functions of NR MAC can include some of the following functions.

[0111] - Mapping function (Mapping between logical channels and transport channels)

[0112] - Multiplexing / demultiplexing of MAC SDUs

[0113] - Scheduling information reporting function

[0114] - HARQ function (Error correction through HARQ)

[0115] - Priority handling between logical channels of one UE

[0116] - Priority handling between UEs by means of dynamic scheduling

[0117] - MBMS service identification function

[0118] - Transport format selection function

[0119] - Padding function

[0120] The NR PHY layer (4-20, 4-25) can perform operations such as channel coding and modulating upper layer data, converting it into OFDM symbols and transmitting it over a wireless channel, or demodulating and channel decoding OFDM symbols received over a wireless channel and transmitting them to a higher layer.

[0121] FIG. 5 is a flowchart of a process in which a terminal transmits a measurement result message to a base station in a next-generation mobile communication system according to an embodiment of the present disclosure.

[0122] The terminal (5-01) can derive cell measurement results by measuring one or more beams related to each cell according to the settings of the base station (5-02). At this time, the terminal (5-01) can derive cell measurement results by applying Layer 3 filtering, and can determine whether a measurement report is triggered based on the cell measurement result to which Layer 3 filtering is applied. The terminal (5-01) according to the present disclosure has a characteristic of maintaining the most recently updated Layer 3 filtered cell measurement result and not maintaining previously derived Layer 3 filtered cell measurement results.

[0123] The terminal (5-01) may be configured by the base station (5-02) to report beam-specific measurement information. The beam-specific measurement information may include a beam identifier corresponding to a given beam, or may include a beam identifier and a beam measurement result corresponding to a given beam. In this case, the terminal (5-01) may apply Layer 3 filtering to derive beam-specific measurement information and include it in measurement reports. The terminal (5-01) according to the present disclosure has a characteristic of maintaining the most recently updated Layer 3 filtered beam measurement result and not maintaining previously derived Layer 3 filtered beam measurement results.

[0124] Referring to FIG. 5, the terminal (5-01) may be in RRC connection mode (RRC_CONNECTED) by establishing an RRC connection with an NR base station (5-02) (5-05).

[0125] In step 5-10, the base station (5-02) may transmit an RRC message (e.g., RRCReconfiguration) containing measurement configuration information (MeasConfig) to the terminal (5-01). The measurement configuration information may include at least one of measurement objects, reporting configurations, measurement identifiers, measurement filtering configuration information (Quantity configurations), and measurement gap configuration information (Measurement gaps), and a description of each parameter may be as shown in Table 1.

[0126] [Table 1]

[0127]

[0128]

[0129] Specific information about the above measurement setting information can be expressed in the ASN.1 structure shown in Table 2 below.

[0130] [Table 2]

[0131]

[0132] [Table 3]

[0133]

[0134] In step 5-15, the terminal (5-01) can perform measurements based on the measurement setting information received from the base station (5-02). Specifically, the terminal (5-01) can perform measurements through the procedure in Table 4 below.

[0135] [Table 4]

[0136]

[0137]

[0138]

[0139]

[0140]

[0141] When each terminal performs measurement through the procedure described above, the method for performing Layer 3 filtering (Layer 3 filtering) can follow the procedure in Table 5 below, the method for deriving cell measurement results (Derivation of cell measurement results) can follow the procedure in Table 6 below, and the method for deriving Layer 3 beam filtered measurement results (Derivation of layer 3 beam filtered measurement) can follow the procedure in Table 7 below.

[0142] [Table 5]

[0143]

[0144] [Table 6]

[0145]

[0146] [Table 7]

[0147]

[0148] The terminal (5-01) according to the present disclosure has a feature of maintaining new Layer 3 filtered cell and / or beam measurement results when they are derived, and not maintaining previously derived Layer 3 filtered cell and / or beam measurement results. Accordingly, the terminal (5-01) can report only the results it maintains to the base station (5-02). For example, (in the case of a=1 / 2), when the terminal (5-01) derives the Layer 3 filtered cell measurement results as follows, it does not maintain previously derived result values ​​(F1, F2, ..., Fn-1) and does not report these result values ​​to the base station (5-02). That is, the terminal (5-01) has a feature of determining whether a condition for reporting a measurement result report message (MeasurementReport) based on Fn is triggered, and transmitting a measurement result report message containing Fn to the base station.

[0149] - M1 = F0 = -150 dbm -> F1 = (0.8)*(-150) + (0.2)*(-150) = -150 dbm

[0150] - M2 = -140 dbm -> F2 = (0.8) * (-150) + (0.2)*(-140) = -148 dbm

[0151] - M3 = -100 dbm -> F3 = (0.8)*(-148) + 0.2*(-100) = -138.4 dbm

[0152] - ...

[0153] - Mn-1 = -40 dbm -> Fn-1 = (0.8)*(-50) + 0.2*(-40) = -48 dbm

[0154] - Mn = - 31 dbm -> Fn = (0.8)*(-48) + 0.2*(-31) = -44.6 dbm = 34.674 W

[0155] In step 5-20, the terminal (5-01) can determine whether a condition for reporting a measurement result message (MeasurementReport) to the base station (5-02) is triggered based on the result measured in step 5-15. The measurement report triggering condition may be event-based or periodic. The measurement configuration information received in step 5-10 includes one or more measObjectId, reportConfigId, and measId. Since each measId is mapped to a specific measObject and a specific reportConfig, the terminal (5-01) determines whether a reporting condition (reporting criterion) specified in a specific reportConfig is satisfied, and if the condition is satisfied, the terminal (5-01) can transmit a measurement result report message (MeasurementReport) including the measId mapped to the corresponding reportConfig and the measurement result associated with the corresponding measId to the base station (5-02). In the present disclosure, as an event for managing the mobility of a terminal (5-01), for the sake of convenience of explanation, event A3 (when the signal of a surrounding cell is offset better than the SpCell signal of the terminal) is set to the terminal (5-01) for a given measObjectNR, and a measurement result is triggered based on this. For reference, the applicable surrounding cell for eventA3 associated with the given measObjectNR of the terminal (5-01) can be determined as follows.

[0156] - If a serving cell associated with a measObjectNR is associated with a given measObjectNR and neighboring cells are associated with other measObjectNRs, the UE may also consider all serving cells associated with other measOjbectNRs as neighboring cells (if a serving cell is associated with a measObjectNR and neighbors are associated with another measObjectNR, the UE considers any serving cell associated with the other measObjectNR to be a neighboring cell as well).

[0157] - If useAllowedCellList is set to true, the UE considers any neighboring cell detected based on parameters in the associated measObjectNR to be applicable when the concerned cell is included in the allowedCellsToAddModList defined within the VarMeasConfig for this measId among all neighboring cells detected based on the parameters set in the measObjectNR.

[0158] - If useAllowedCellList is not set to true, the terminal may consider any neighboring cell detected based on parameters set in the measObjectNR to be applicable when the concerned cell is not included in the excludedCellsToAddModList defined within the VarMeasConfig for the measId mapped to the measObjectNR (else, consider any neighboring cell detected based on parameters in the associated measObjectNR to be applicable when the concerned cell is not included in the excludedCellsToAddModList defined within the VarMeasConfig for this measId).

[0159] The above terminal may determine that the measurement result is triggered if at least one of the following conditions is satisfied among the applicable surrounding cells.

[0160] - For the measurement results filtered by Layer 3, if one or more applicable cells satisfy the entry condition for event A3 during timeToTrigger, and the terminal variable VarMeasReportList does not contain a measurement report entry for the measId described above.

[0161] ■ At this time, the terminal may include cell(s) that satisfy the above conditions in the cellsTriggeredList before initiating the measurement reporting procedure.

[0162] - If one or more applicable cells that are not included in the cellsTriggeredList for the measurement results filtered by Layer 3 satisfy the entry condition for event A3 during timeToTrigger.

[0163] ■ At this time, the terminal may include cell(s) that satisfy the above conditions in the cellsTriggeredList before initiating the measurement reporting procedure.

[0164] - If one or more cells included in cellsTriggeredList satisfy the leaving condition for event A3 during timeToTrigger for the measurement results filtered by Layer 3, and reportOnLeave is set to true.

[0165] For reference, the entry and leaving conditions for event A3 are as shown in Table 8 below.

[0166] [Table 8]

[0167]

[0168] Specifically, the terminal (5-01) can determine whether the measurement result is triggered through the procedure in Table 9 below.

[0169] [Table 9]

[0170]

[0171]

[0172]

[0173]

[0174]

[0175]

[0176]

[0177]

[0178]

[0179]

[0180]

[0181]

[0182]

[0183]

[0184]

[0185]

[0186]

[0187]

[0188] In step 5-25, the terminal (5-01) can include the measurement results (measResults) for the measId for which the measurement reporting procedure was triggered in step 5-20 in a measurement results message (MeasurementReport) and transmit it to the base station (5-02). For reference, the terminal (5-01) can store beam measurement information and cell measurement results in the measurement results as shown in Table 10 below.

[0189] [Table 10]

[0190]

[0191]

[0192] The specific procedure for the above terminal (5-01) to include the measurement result (MeasResults) in the measurement report message may be as shown in Table 11 below.

[0193] [Table 11]

[0194]

[0195]

[0196]

[0197]

[0198]

[0199]

[0200]

[0201]

[0202]

[0203] FIG. 6 is a flowchart of a process in which a terminal transmits a measurement result message to a base station in a next-generation mobile communication system according to an embodiment of the present disclosure.

[0204] The terminal (6-01) can measure one or more beams associated with each cell according to the settings of the base station (6-02) to derive cell measurement results. At this time, the terminal (6-01) can derive cell measurement results by applying Layer 3 filtering, and can determine whether a measurement report is triggered based on the cell measurement result to which Layer 3 filtering is applied. Unlike the above-described embodiment (Fig. 5), the terminal (6-01) according to the present disclosure has a feature of storing Layer 3 filtered cell measurement result history information and reporting it to the base station (6-02). That is, the terminal (6-01) can maintain each Layer 3 filtered cell measurement result and report a Layer 3 filtered cell measurement result list to the base station (6-02). The base station (6-02) can use the cell-by-cell Layer 3 filtered cell measurement result history information received from the terminal (6-01) for future mobility management of the terminal (6-01) (e.g., parameter setting for handover optimization and optimal handover instruction).

[0205] The terminal (6-01) may be configured by the base station (6-02) to report beam-specific measurement information. The beam-specific measurement information may mean a beam identifier corresponding to a given beam, or may mean a beam identifier and a beam measurement result corresponding to a given beam. At this time, the terminal (6-01) may apply Layer 3 filtering to derive beam-specific measurement information and include it in measurement reports. Unlike the above-described embodiment (FIG. 5), the terminal (6-01) according to the present disclosure has a feature of storing Layer 3 filtered beam measurement result history information and reporting it to the base station (6-02). That is, the terminal (6-01) may maintain each beam measurement result filtered by Layer 3 and report a list of beam measurement results filtered by Layer to the base station (6-02). The base station (6-02) can use the cell-specific Layer 3 filtered beam measurement result history information received from the terminal (6-01) for future mobility management of the terminal (6-01) (e.g., parameter setting for handover optimization and optimal handover instruction) and beam setting management.

[0206] Referring to FIG. 6, the terminal (6-01) may be in RRC connection mode (RRC_CONNECTED) by establishing an RRC connection with an NR base station (6-02) (6-05)

[0207] In step 6-10, the terminal (6-01) may transmit a terminal capability information message (UECapabilityInformation) to the base station (6-02). It is proposed that the message include the following information:

[0208] - Capability information indicating the ability to store and report cell and / or beam measurement history information.

[0209] ■ Capability information regarding the extent of memory that the terminal can use may also be provided separately or additionally for the above capability information. For example, the base station may be informed of the minimum or maximum memory that can store cell and / or beam measurement history information.

[0210] In step 6-15, the base station (6-02) may transmit a predetermined RRC message (e.g., RRCReconfiguration) containing measurement configuration information (MeasConfig) to the terminal (6-01). This may follow the aforementioned embodiment (Fig. 5). The present disclosure proposes that the measurement configuration information include the following information.

[0211] - An indicator indicating to save (save and report) measurement cell and / or beam measurement history information per report configuration.

[0212] ■ The above indicator can be set to a certain event (e.g., event A3, eventA5) that can be used for terminal mobility (e.g., handover).

[0213] In step 6-20, the terminal (6-01) can perform measurement based on measurement setting information received from the base station (6-02). This can follow the embodiment of FIG. 5 described above. Additionally, the terminal according to the present disclosure has a feature that, when it derives a Layer 3 filtered cell and / or beam measurement result, it can store it in the memory of the terminal (6-01) (storage within a specific terminal variable). For example, when the terminal derives a Layer 3 filtered cell measurement result as follows, it can store the most recent Layer 3 filtered measurement result (Fn) and previous Layer 3 filtered measurement results (F0, F1, F2, ..., Fn-1) in the memory of the terminal (6-01).

[0214] - M1 = F0 = -150 dbm -> F1 = (0.8)*(-150) + (0.2)*(-150) = -150 dbm

[0215] - M2 = -140 dbm -> F2 = (0.8) * (-150) + (0.2)*(-140) = -148 dbm

[0216] - M3 = -100 dbm -> F3 = (0.8)*(-148) + 0.2*(-100) = -138.4 dbm

[0217] - …

[0218] - Mn-1 = -40 dbm -> Fn-1 = (0.8)*(-50) + 0.2*(-40) = -48 dbm

[0219] - Mn = - 31 dbm -> Fn = (0.8)*(-48) + 0.2*(-31) = -44.6 dbm = 34.674 W

[0220] For reference, the terminal (6-01) may store only the cell-specific Layer 3 filtered cell measurement result list information in the memory, or may store both the cell-specific Layer 3 filtered cell measurement result list and the cell-specific Layer 3 filtered beam measurement result list together in the memory. The maximum number of cells that can be stored in the memory of the terminal (6-01) may be limited. When the maximum number of cells is stored in the memory or the terminal's memory is full, the terminal (6-01) may delete the measurement result for the most previously stored cell and store the measurement result for the most recently derived cell in the memory. The same may be applied to the cell-specific beam measurement results of the above-described description.

[0221] In step 6-25, the terminal (6-01) can determine whether a condition for reporting a measurement result message (MeasurementReport) to the base station (6-02) based on the measurement result in step 6-15 is triggered. This can follow the embodiment of FIG. 5 described above.

[0222] In step 6-30, the terminal (6-01) may include the measurement results (measResults) for the measId for which the measurement reporting procedure was triggered in step 6-20 in a measurement result message (MeasurementReport) and transmit it to the base station (6-02). This may follow the embodiment of FIG. 5 described above. The terminal (6-01) according to the present disclosure may include at least one of the following in the measurement result message.

[0223] - Layer 3 filtered cell measurement result history information for cells included in cellsTriggeredList

[0224] - Layer 3 filtered cell measurement result history information for the cells included in cellsTriggeredList and Layer 3 filtered beam measurement result history information for each cell.

[0225] - Layer 3 filtered cell and / or beam measurement result history information stored in the memory of the terminal (6-01) in step 6-20.

[0226] ■ Applicable refers to the measurement result history information for surrounding cells.

[0227] FIG. 7 is a flowchart of a process in which a terminal transmits a measurement result message to a base station in a next-generation mobile communication system according to an embodiment of the present disclosure.

[0228] Referring to FIG. 7, the terminal (7-01) may be in RRC connection mode (RRC_CONNECTED) by establishing an RRC connection with an NR base station (7-02) (7-05).

[0229] In step 7-10, the terminal (7-01) may transmit a terminal capability information message (UECapabilityInformation) to the base station (7-02). This may follow the embodiment described above (Fig. 6).

[0230] In step 7-15, the base station (7-02) may transmit a predetermined RRC message (e.g., RRCReconfiguration) containing measurement configuration information (MeasConfig) to the terminal (7-01). This may follow at least one of the aforementioned embodiments (Figs. 5 and 6). The present disclosure proposes that the measurement configuration information include the following information.

[0231] - Configuration information indicating how many cell measurement history information (up to) will be stored per report configuration. For example, the terminal can be configured to store up to three Layer 3 filtered cell measurement results for one cell, or up to three Layer 3 filtered cell measurement results for each cell.

[0232] ■ For reference, the terminal may store only the most recently derived Layer 3 filtered beam measurement results for each cell, or may store the Layer 3 filtered beam measurement results together with the Layer 3 filtered cell measurement results for each cell.

[0233] - Configuration information indicating how many beam measurement history information (up to) will be stored per report configuration. For example, the terminal can be configured to store up to three Layer 3 filtered beam measurement results per beam for one cell, or each Layer 3 filtered beam measurement result derived for one cell can be stored up to three times.

[0234] In step 7-20, the terminal (7-01) can perform measurements based on measurement configuration information received from the base station (7-02). This can follow at least one of the aforementioned embodiments (Figs. 5 and 6). The terminal according to the present disclosure can, in step 7-15, derive Layer 3 filtered cell and / or beam measurement results according to the configuration of the base station (7-02), store them in the memory of the terminal (7-01) (storage within specific terminal variables).

[0235] In step 7-25, the terminal (7-01) can determine whether a condition for reporting a measurement result message (MeasurementReport) to the base station (7-02) based on the measurement result in step 7-15 is triggered. This can follow the aforementioned embodiments (Figs. 5 and 6).

[0236] In step 7-30, the terminal (7-01) may include the measurement results (measResults) for the measId for which the measurement reporting procedure was triggered in step 7-20 in a measurement result message (MeasurementReport) and transmit it to the base station (7-02). This may follow the aforementioned embodiments (Figs. 5 and 6). The terminal (7-01) according to the present disclosure may include at least one of the following in the measurement result message.

[0237] - Layer 3 filtered cell measurement result history information for cells included in cellsTriggeredList

[0238] ■ At this time, the above information can be included in the cell measurement result message according to the settings indicated in steps 7-15.

[0239] - Layer 3 filtered cell measurement result history information for the cells included in cellsTriggeredList and Layer 3 filtered beam measurement result history information for each cell.

[0240] ■ At this time, the above information can be included in the cell / beam measurement result message according to the settings indicated in steps 7-15.

[0241] - Layer 3 filtered cell and / or beam measurement result history information stored in the memory of the terminal (7-01) in step 7-20.

[0242] ■ Applicable refers to the measurement result history information for surrounding cells.

[0243] ■ At this time, the above information can be included in the cell / beam measurement result message according to the settings indicated in steps 7-15.

[0244] FIG. 8 is a flowchart of a process in which a terminal transmits a measurement result message to a base station in a next-generation mobile communication system according to an embodiment of the present disclosure.

[0245] Referring to FIG. 8, the terminal (8-01) may be in RRC connection mode (RRC_CONNECTED) by establishing an RRC connection with an NR base station (8-02) (8-05).

[0246] In step 8-10, the terminal (8-01) may transmit a terminal capability information message (UECapabilityInformation) to the base station (8-02). This may follow the embodiment described above (Fig. 6).

[0247] In step 8-15, the base station (8-02) may transmit a predetermined RRC message (e.g., RRCReconfiguration) containing measurement configuration information (MeasConfig) to the terminal (8-01). This may follow at least one of the aforementioned embodiments (Figs. 5, 6, and 7). The present disclosure proposes that the measurement configuration information include at least one of the following information.

[0248] - List of cells to store cell measurement history information per report configuration

[0249] ■ The terminal can store Layer 3 filtered cell measurement result history information for the set cell list in the terminal memory and report it to the base station.

[0250] ■ The Layer 3 filtered beam measurement results can also be stored in the terminal memory along with the Layer 3 filtered cell measurement results for each cell and reported to the base station.

[0251] - Cell-by-cell priority information for each measurement report

[0252] ■ When cell-specific priorities are set, cell and / or beam measurement result history information can be stored and reported to the base station with priority given to cells with higher priorities.

[0253] ■ For reference, the above information can be set up along with the cell list in which cell measurement history information will be stored per report configuration.

[0254] In step 8-20, the terminal (8-01) can perform measurements based on the measurement configuration information received from the base station (8-02). This can follow at least one of the above-described embodiments (Figs. 5, 6, and 7). The terminal (8-01) according to the present disclosure can derive Layer 3 filtered cell and / or beam measurement results for the cell lists set in step 8-15 and store them in the memory of the terminal (8-01) (storage within a specific terminal variable).

[0255] In step 8-25, the terminal (8-01) can determine whether a condition for reporting a measurement result message (MeasurementReport) to the base station (8-02) based on the measurement result in step 8-15 is triggered. This can follow the aforementioned embodiments (Figs. 5, 6, and 7).

[0256] In step 8-30, the terminal (8-01) may include the measurement results (measResults) for the measId for which the measurement reporting procedure was triggered in step 8-20 in a measurement result message (MeasurementReport) and transmit it to the base station (8-02). This may follow at least one of the aforementioned embodiments (Fig. 5, Fig. 6, Fig. 7). The terminal (8-01) according to the present disclosure may include at least one of the following in the measurement result message.

[0257] - Layer 3 filtered cell and / or beam measurement result history information for cells set in steps 8-15.

[0258] FIG. 9 is a flowchart of a process in which a terminal transmits a measurement result message to a base station in a next-generation mobile communication system according to an embodiment of the present disclosure.

[0259] Referring to FIG. 9, the terminal (9-01) may be in RRC connection mode (RRC_CONNECTED) by establishing an RRC connection with an NR base station (9-02) (9-05).

[0260] In steps 9-10, the terminal (9-01) may transmit a terminal capability information message (UECapabilityInformation) to the base station (9-02). This may follow the embodiment described above (Fig. 6).

[0261] In step 9-15, the base station (9-02) may transmit a predetermined RRC message (e.g., RRCReconfiguration) containing measurement configuration information (MeasConfig) to the terminal (9-01). This may follow at least one of the embodiments described above (Figs. 5, 6, 7, and 8). The present disclosure proposes that the measurement configuration information include at least one of the following information.

[0262] - A time value (T) indicating the cycle for storing cell measurement history information per report configuration.

[0263] ■ Of course, when saving the Layer 3 filtered cell measurement results according to the above time value, the Layer 3 filtered beam measurement results can also be saved together.

[0264] In step 9-20, the terminal (9-01) can perform measurement based on the measurement configuration information received from the base station (9-02). This can follow at least one of the above-described embodiments (FIGS. 5, 6, 7, and 8). The terminal (9-01) according to the present disclosure can store the Layer 3 filtered cell and / or beam measurement results derived by applying the time value set in step 9-15 in the memory of the terminal (9-01). That is, the terminal (9-01) can store the Layer 3 filtered cell and / or beam measurement results in the memory of the terminal (9-01) according to a time cycle (At each T, UE records / logs the latest filtered measurement result in memory). Of course, the terminal (9-01) can also manage the cycle for storing the Layer 3 filtered cell and / or beam measurement results by running a timer with the value set in step 9-15. For example, the terminal (9-01) may store the Layer 3 filtered cell and / or beam measurement results in the memory of the terminal (9-01) and (re)start the timer when the timer is not running. That is, when the timer expires, the terminal (9-01) may repeat the operation of storing the Layer 3 filtered cell and / or beam measurement results in the memory of the terminal (9-01) and (re)starting the timer.

[0265] In step 9-25, the terminal (9-01) can determine whether a condition for reporting a measurement result message (MeasurementReport) to the base station (9-02) based on the measurement result in step 9-15 is triggered. This can follow the aforementioned embodiments (Figs. 5, 6, 7, and 8).

[0266] In step 9-30, the terminal (9-01) may include the measurement results (measResults) for the measId for which the measurement reporting procedure was triggered in step 9-20 in a measurement result message (MeasurementReport) and transmit it to the base station (9-02). This may follow at least one of the embodiments described above (Figs. 5, 6, 7, and 8). The terminal according to the present disclosure may include history information for storing Layer 3 filtered cell and / or beam measurement results in the measurement result message according to the time period set in step 9-15.

[0267] FIG. 10 is a flowchart of a process in which a terminal transmits a measurement result message to a base station in a next-generation mobile communication system according to an embodiment of the present disclosure.

[0268] Referring to FIG. 10, the terminal (10-01) may be in RRC connection mode (RRC_CONNECTED) by establishing an RRC connection with an NR base station (10-02) (10-05).

[0269] In step 10-10, the terminal (10-01) may transmit a terminal capability information message (UECapabilityInformation) to the base station (10-02). This may follow the embodiment described above (Fig. 6).

[0270] In step 10-15, the base station (10-02) may transmit a predetermined RRC message (e.g., RRCReconfiguration) containing measurement configuration information (MeasConfig) to the terminal (10-01). This may follow at least one of the embodiments described above (Fig. 5, Fig. 6, Fig. 7, Fig. 8, Fig. 9).

[0271] In step 10-20, the terminal (10-01) may perform measurements based on measurement configuration information received from the base station (10-02). This may follow at least one of the aforementioned embodiments (Figs. 5, 6, 7, 8, and 9). The terminal (10-01) according to the present disclosure may store cell and / or beam measurement results in the memory of the terminal (10-01) through at least one of the following methods.

[0272] - If there is a cell that satisfies the entering condition (and / or the leaving condition) for the set event, the Layer 3 filtered cell and / or beam measurement results for the cell can be stored in the memory of the terminal (10-01). At this time, a time value indicating the point in time of storage can also be stored.

[0273] In step 10-25, the terminal (10-01) can determine whether a condition for reporting a measurement result message (MeasurementReport) to the base station (10-02) based on the measurement result in step 10-15 is triggered. This can follow the aforementioned embodiments (Figs. 5, 6, 7, 8, and 9).

[0274] In step 10-30, the terminal (10-01) may include the measurement results (measResults) for the measId for which the measurement reporting procedure was triggered in step 10-20 in a measurement results message (MeasurementReport) and transmit it to the base station (10-02). This may follow at least one of the aforementioned embodiments (Figs. 5, 6, 7, 8, and 9). The terminal (10-01) according to the present disclosure may include information stored in the memory of the terminal (10-01) in the measurement results message through at least one of the following methods.

[0275] - Method 1: The terminal stores only Layer 3 filtered cell and / or beam measurement results and time values ​​for cells in the cellsTriggeredList (concerned cells in cellsTriggeredList) in the measurement result message.

[0276] - Method 2: Store Layer 3 filtered cell and / or beam measurement results and time values ​​for the cells (applicable cells) saved in steps 10-20 in the measurement result message.

[0277] FIG. 11 is a flowchart of a process in which a terminal transmits a measurement result message to a base station in a next-generation mobile communication system according to an embodiment of the present disclosure.

[0278] Referring to FIG. 11, the terminal (11-01) may be in RRC connection mode (RRC_CONNECTED) by establishing an RRC connection with an NR base station (11-02) (11-05).

[0279] In step 11-10, the terminal (11-01) can transmit a terminal capability information message (UECapabilityInformation) to the base station (11-02). This can follow the embodiment (6) described above.

[0280] In step 11-15, the base station (11-02) may transmit a predetermined RRC message (e.g., RRCReconfiguration) containing measurement configuration information (MeasConfig) to the terminal (11-01). This may follow at least one of the aforementioned embodiments (Figs. 5, 6, 7, 8, and 9). Of course, information indicating to store (save and report) measurement cell and / or beam measurement history information may also be set for each MeasObject.

[0281] In step 11-20, the terminal (11-01) may perform measurements based on measurement configuration information received from the base station (11-02). The terminal may store cell and / or beam measurement result history information in the memory of the terminal (11-01) according to at least one of the above-described embodiments (Figs. 5, 6, 7, 8, and 9).

[0282] In step 11-25, the terminal (11-01) can determine whether a condition for reporting a measurement result message (MeasurementReport) to the base station (11-02) based on the measurement result in step 11-15 is triggered. This can follow the aforementioned embodiments (Figs. 5, 6, 7, 8, 9, and 10).

[0283] In step 11-30, the terminal (11-01) may transmit the measurement results (measResults) for the measId for which the measurement reporting procedure was triggered in step 11-20 to the base station (11-02) in a measurement result message (MeasurementReport). This may follow at least one of the embodiments described above (Figs. 5, 6, 7, 8, 9, and 10). The message may also include information or an indicator about the availability of cell and / or beam measurement history information (available indicator about cell and / or beam measurement history information).

[0284] At step 11-35, the base station (11-02) may transmit a terminal information request message (UEInformationRequest) containing an instruction to send cell and / or beam measurement history information to the terminal (11-01).

[0285] In step 11-40, the terminal (11-01) can transmit a terminal information response message (UEInformationResponse) containing cell and / or beam measurement history information to the base station (11-02).

[0286] FIG. 12 is a diagram showing the configuration of a terminal according to an embodiment of the present disclosure.

[0287] Referring to the above drawing, the terminal includes an RF (Radio Frequency) processing unit (12-10), a baseband processing unit (12-20), a storage unit (12-30), and a control unit (12-40). The control unit (12-40) may further include a multi-connection processing unit (12-042).

[0288] The RF processing unit (12-10) performs functions for transmitting and receiving signals through a wireless channel, such as signal band conversion and amplification. That is, the RF processing unit (12-10) up-converts the baseband signal provided from the baseband processing unit (12-20) into an RF band signal and transmits it through an antenna, and down-converts the RF band signal received through the antenna into a baseband signal. For example, the RF processing unit (12-10) may include a transmission filter, a reception filter, an amplifier, a mixer, an oscillator, a digital to analog convertor (DAC), an analog to digital convertor (ADC), etc. In the drawing, only one antenna is shown, but the terminal may be equipped with multiple antennas. In addition, the RF processing unit (12-10) may include multiple RF chains. Furthermore, the RF processing unit (12-10) may perform beamforming. For the above beamforming, the RF processing unit (12-10) can adjust the phase and size of each signal transmitted and received through multiple antennas or antenna elements. In addition, the RF processing unit can perform MIMO and receive multiple layers when performing the MIMO operation.

[0289] The baseband processing unit (12-20) above performs a conversion function between a baseband signal and a bit stream according to the physical layer specifications of the system. For example, when transmitting data, the baseband processing unit (12-20) generates complex symbols by encoding and modulating a transmission bit stream. In addition, when receiving data, the baseband processing unit (12-20) restores the reception bit stream by demodulating and decoding the baseband signal provided from the RF processing unit (12-10). For example, in the case of following the OFDM (orthogonal frequency division multiplexing) method, when transmitting data, the baseband processing unit (12-20) generates complex symbols by encoding and modulating a transmission bit stream, maps the complex symbols to subcarriers, and then configures OFDM symbols through an inverse fast Fourier transform (IFFT) operation and a cyclic prefix (CP) insertion. In addition, when receiving data, the baseband processing unit (12-20) divides the baseband signal provided from the RF processing unit (12-10) into OFDM symbol units, restores signals mapped to subcarriers through FFT (fast Fourier transform), and then restores the received bit string through demodulation and decoding.

[0290] The baseband processing unit (12-20) and the RF processing unit (12-10) transmit and receive signals as described above. Accordingly, the baseband processing unit (12-20) and the RF processing unit (12-10) may be referred to as a transmitter, a receiver, a transceiver, or a communication unit. Furthermore, at least one of the baseband processing unit (12-20) and the RF processing unit (12-10) may include a plurality of communication modules to support a plurality of different wireless access technologies. In addition, at least one of the baseband processing unit (12-20) and the RF processing unit (12-10) may include different communication modules to process signals of different frequency bands. For example, the different wireless access technologies may include a wireless LAN (e.g., IEEE 802.11), a cellular network (e.g., LTE), etc. Additionally, the different frequency bands may include a super high frequency (SHF) (e.g., 2.NRHz, NRhz) band and a millimeter wave (mm wave) (e.g., 60GHz) band.

[0291] The storage unit (12-30) stores data such as basic programs, application programs, and setting information for the operation of the terminal. In particular, the storage unit (12-30) can store information related to a second access node that performs wireless communication using a second wireless access technology. In addition, the storage unit (12-30) provides the stored data at the request of the control unit (12-40).

[0292] The control unit (12-40) controls the overall operations of the terminal. For example, the control unit (12-40) transmits and receives signals through the baseband processing unit (12-20) and the RF processing unit (12-10). In addition, the control unit (12-40) records and reads data in the storage unit (12-30). For this purpose, the control unit (12-40) may include at least one processor. For example, the control unit (12-40) may include a communication processor (CP) that performs control for communication and an application processor (AP) that controls upper layers such as application programs.

[0293] FIG. 13 is a diagram showing the configuration of a base station according to one embodiment of the present disclosure.

[0294] As shown in the above drawing, the base station is configured to include an RF processing unit (13-10), a baseband processing unit (13-20), a backhaul communication unit (13-30), a storage unit (13-40), and a control unit (13-50). The control unit (13-50) may further include a multi-connection processing unit (13-52).

[0295] The RF processing unit (13-10) performs functions for transmitting and receiving signals through a wireless channel, such as signal band conversion and amplification. That is, the RF processing unit (13-10) up-converts the baseband signal provided from the baseband processing unit (13-20) into an RF band signal and transmits it through an antenna, and down-converts the RF band signal received through the antenna into a baseband signal. For example, the RF processing unit (13-10) may include a transmission filter, a reception filter, an amplifier, a mixer, an oscillator, a DAC, an ADC, etc. In the drawing, only one antenna is shown, but the first access node may have multiple antennas. In addition, the RF processing unit (13-10) may include multiple RF chains. Furthermore, the RF processing unit (13-10) may perform beamforming. For the above beamforming, the RF processing unit (13-10) can adjust the phase and size of each signal transmitted and received through multiple antennas or antenna elements. The RF processing unit can perform a downlink MIMO operation by transmitting one or more layers.

[0296] The baseband processing unit (13-20) above performs a conversion function between a baseband signal and a bit stream according to the physical layer specifications of the first wireless access technology. For example, when transmitting data, the baseband processing unit (13-20) generates complex symbols by encoding and modulating a transmission bit stream. In addition, when receiving data, the baseband processing unit (13-20) restores the reception bit stream by demodulating and decoding the baseband signal provided from the RF processing unit (13-10). For example, in the case of OFDM, when transmitting data, the baseband processing unit (13-20) generates complex symbols by encoding and modulating a transmission bit stream, maps the complex symbols to subcarriers, and then configures OFDM symbols through IFFT operation and CP insertion. In addition, when receiving data, the baseband processing unit (13-20) divides the baseband signal provided from the RF processing unit (13-10) into OFDM symbol units, restores the signals mapped to subcarriers through FFT operation, and then restores the received bit string through demodulation and decoding. The baseband processing unit (13-20) and the RF processing unit (13-10) transmit and receive signals as described above. Accordingly, the baseband processing unit (13-20) and the RF processing unit (13-10) may be referred to as a transmitter, a receiver, a transceiver, a communication unit, or a wireless communication unit.

[0297] The above backhaul communication unit (13-30) provides an interface for performing communication with other nodes within the network. That is, the backhaul communication unit (13-30) converts a bit string transmitted from the main base station to another node, such as an auxiliary base station or core network, into a physical signal, and converts a physical signal received from the other node into a bit string.

[0298] The storage unit (13-40) stores data such as basic programs, application programs, and setting information for the operation of the base station. In particular, the storage unit (13-40) can store information on bearers assigned to connected terminals, measurement results reported from connected terminals, and the like. In addition, the storage unit (13-40) can store information that serves as a judgment criterion for whether to provide or terminate multiple connections to a terminal. In addition, the storage unit (13-40) provides the stored data at the request of the control unit (13-50).

[0299] The control unit (13-50) controls the overall operations of the base station. For example, the control unit (13-50) transmits and receives signals through the baseband processing unit (13-20) and the RF processing unit (13-10) or through the backhaul communication unit (13-30). In addition, the control unit (13-50) records and reads data in the storage unit (13-40). For this purpose, the control unit (13-50) may include at least one processor.

[0300] The methods according to the embodiments described in the claims or specification of the present disclosure may be implemented in the form of hardware, software, or a combination of hardware and software.

[0301] When implemented in software, a computer-readable storage medium storing one or more programs (software modules) may be provided. The one or more programs stored in the computer-readable storage medium are configured for execution by one or more processors within an electronic device. The one or more programs include instructions that cause the electronic device to execute methods according to the embodiments described in the claims or specification of the present disclosure.

[0302] These programs (software modules, software) may be stored in a non-volatile memory including random access memory, flash memory, read only memory (ROM), electrically erasable programmable read only memory (EEPROM), magnetic disc storage devices, compact disc ROMs (CD-ROMs), digital versatile discs (DVDs) or other forms of optical storage devices, magnetic cassettes, or may be stored in a memory configured as a combination of some or all of these. In addition, each configuration memory may be included in multiple numbers.

[0303] Additionally, the program may be stored on an attachable storage device that is accessible via a communication network such as the Internet, an intranet, a local area network (LAN), a wide local area network (WLAN), a storage area network (SAN), or a combination thereof. Such a storage device may be connected to a device implementing an embodiment of the present disclosure via an external port. Additionally, a separate storage device on the communication network may be connected to a device implementing an embodiment of the present disclosure.

[0304] In the specific embodiments of the present disclosure described above, components included in the present disclosure are expressed singularly or plurally, depending on the specific embodiment presented. However, the singular or plural expressions are selected to suit the presented situation for convenience of explanation, and the present disclosure is not limited to singular or plural components. Components expressed in plural may be composed of singular elements, or components expressed in singular may be composed of plural elements.

[0305] Meanwhile, the embodiments of the present disclosure disclosed in this specification and drawings are merely specific examples to easily explain the technical contents of the present disclosure and to help understand the present disclosure, and are not intended to limit the scope of the present disclosure. In other words, it will be apparent to those skilled in the art that other modifications based on the technical idea of ​​the present disclosure are possible. In addition, the respective embodiments may be combined and operated with each other as needed. For example, parts of one embodiment of the present disclosure and another embodiment may be combined with each other to operate a base station and a terminal. In addition, the embodiments of the present disclosure are applicable to other communication systems, and other modifications based on the technical idea of ​​the embodiments may also be implemented.

Claims

1. In a method performed by a terminal in a wireless communication system, A step of receiving measurement setting information from a base station; If the above measurement setting information includes time information indicating a cycle for storing measurement results for a measurement report, a step of storing measurement results with layer 3 filtering applied based on the measurement setting information based on the cycle; A step for determining whether a measurement report event has occurred; and If the above measurement report event occurs, a step of transmitting cell measurement history information including the measurement result to the base station is included. A method wherein the above cell measurement history information includes multiple measurement results to which the layer 3 filtering is applied.

2. In paragraph 1, The above terminal stores the measurement results to which the most recent layer 3 filtering is applied for each period.

3. In paragraph 1, The time information indicating the above cycle is set for each measurement report, If the number of measurement results stored in the terminal exceeds the maximum number of measurement results that can be stored for each measurement report, the oldest measurement result is deleted. The number of the above measurement lapses is a method of using a preset value or a value set from a base station.

4. In paragraph 1, The above cell measurement history information is, among the stored measurement results, Measurement results for concerned cells in the cell triggered list, or A method comprising measurement results for an applicable cell.

5. In paragraph 1, A method in which, when the above measurement result is stored based on an entering condition or leaving condition for an event, the terminal stores time information indicating the storage time of the measurement result together.

6. In paragraph 1, Further comprising a step of transmitting terminal performance information indicating whether to support storage or reporting of the above cell measurement history information to the base station, A method wherein the above measurement setting information includes an indicator for instructing storage or reporting of the cell measurement history information for each measurement report based on the terminal performance information.

7. In a method performed by a base station in a wireless communication system, A step of receiving terminal performance information indicating whether to support storage or reporting of cell measurement history information from the terminal; A step of transmitting measurement setting information to the terminal based on the terminal performance information; and If the above measurement setting information includes time information indicating a cycle for storing measurement results for a measurement report, a step of receiving the cell measurement history information including measurement results to which layer 3 filtering is applied based on the cycle is included, A method wherein the above cell measurement history information includes multiple measurement results to which the layer 3 filtering is applied.

8. In paragraph 7, The above cell measurement history information includes the measurement results with the layer 3 filtering applied most recently stored for each period, and The time information indicating the above cycle is set for each measurement report.

9. In the terminal of a wireless communication system, Transmitter and receiver; and Receive measurement setup information from the base station, If the above measurement setting information includes time information indicating a cycle for storing measurement results for a measurement report, the measurement results with layer 3 filtering applied based on the above measurement setting information are stored based on the cycle. Determine whether a measurement report event has occurred, and If the above measurement report event occurs, a control unit is included that transmits cell measurement history information including the measurement result to the base station, The above cell measurement history information is a terminal including multiple measurement results to which the layer 3 filtering is applied.

10. In paragraph 9, The above terminal is a terminal that stores the measurement results to which the most recent layer 3 filtering is applied for each period.

11. In paragraph 9, The time information indicating the above cycle is set for each measurement report, If the number of measurement results stored in the terminal exceeds the maximum number of measurement results that can be stored for each measurement report, the oldest measurement result is deleted. The number of the above measurement progress is a terminal that uses a preset value or a value set from a base station.

12. In paragraph 9, The above cell measurement history information is, among the stored measurement results, Measurement results for concerned cells in the cell triggered list, or A terminal containing measurement results for an applicable cell.

13. In paragraph 9, A terminal that stores time information indicating the storage time of the measurement result together with the measurement result when the measurement result is stored based on an entering condition or leaving condition for an event.

14. In paragraph 9, The control unit transmits terminal performance information indicating whether to support storage or reporting of the cell measurement history information to the base station, and A terminal including an indicator that instructs storage or reporting of the cell measurement history information for each measurement report based on the terminal performance information, wherein the above measurement setting information is based on the terminal performance information.

15. In a base station of a wireless communication system, Transmitter and receiver; and Receive terminal performance information indicating whether to support storage or reporting of cell measurement history information from the terminal; Transmit measurement setting information to the terminal based on the terminal performance information, and If the above measurement setting information includes time information indicating a cycle for storing measurement results for a measurement report, a control unit is included for receiving the cell measurement history information including measurement results to which layer 3 filtering is applied based on the cycle, The above cell measurement history information is a base station including multiple measurement results to which the layer 3 filtering is applied.

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