Terminal device, base station device, and wireless communication method

Abstract

Provided is a terminal device able to carry out suitable management that includes unused cell settings. Also provided is a base station device and a wireless communication method.　The terminal device (10) carries out wireless communication with the base station device (50) and comprises: a reception unit (11) that receives, from the base station device (50), cell setting information pertaining to cell settings, and group information indicating a cell setting group; an execution unit (12) that executes a mobility control that is based on L1 / L2 signaling; and a management unit (13) that manages a plurality of the cell settings on the basis of the group information and the type of mobility control executed by the execution unit (12).

Description

[Technical Field]

[0001] The present invention relates to a terminal device, a base station device, and a wireless communication method. [Background technology]

[0002] The international standardization organization 3GPP (Third Generation Partnership Project) is currently studying New Radio (NR), a new radio access technology for fifth-generation (5G) cellular communication systems. NR is being considered as a technology that will enable a wider variety of services than the fourth-generation cellular communication system, Long Term Evolution (LTE)-Advanced. For example, NR defines requirements for different usage scenarios, such as enhanced Mobile Broadband (eMBB) for high-speed, high-capacity communication, Ultra-Reliable and Low Latency Communication (URLLC) for ultra-reliable, low-latency communication, and massive Machine Type Communication (mMTC) for simultaneous connection of multiple Internet of Things (IoT) devices.

[0003] In a Radio Access Network (RAN), particularly in a RAN using NR (New Generation RAN (NG-RAN)), an architecture including a central unit (CU) and a distributed unit (DU) is specified for a base station device (gNB), which is an NR base station (see Non-Patent Document 1). Recently, in NR, a method of performing mobility control such as handover, cell selection, and addition or deletion of a secondary cell using control signals (hereinafter also referred to as "signaling") used for communication between a terminal device and a base station device, i.e., L1 / L2-based mobility, has been studied (see Non-Patent Document 2). The method uses signaling of Layer 1 (physical layer) (hereinafter also referred to as "L1") of the Open Systems Interconnection (OSI) reference model and / or signaling of Layer 2 (data link layer) (hereinafter also referred to as "L2") of the OSI reference model (see Non-Patent Document 2). [Prior art documents] [Non-patent literature]

[0004] [Non-Patent Document 1] 3GPP standard document “TS 38.401 V17.1.1 (2022-07)” [Non-patent document 2] 3GPP contribution “RP-221799” Summary of the Invention [Problem to be solved by the invention]

[0005] However, when mobility control (mobility procedure) is performed based on L1 / L2 signaling, it is not clear how to manage unused cell configuration information among multiple related cell configurations (cell configuration information) after the completion of the executed mobility control. As a result, for example, if all unused cell configuration information is discarded, it becomes necessary to notify the cell configuration information again, which may increase signaling overhead. Furthermore, if all unused cell configuration information is retained, individual cell configuration information such as a dedicated RA preamble may not be released for a long period of time, which may lead to inefficient resource allocation. Therefore, an appropriate management method including unused cell configuration information is required in mobility control based on L1 / L2 signaling.

[0006] The present invention has been made in consideration of these circumstances, and one of its objectives is to provide a terminal device, a base station device, and a wireless communication method that are capable of performing appropriate management, including unused cell settings. [Means for solving the problem]

[0007] A terminal device according to one aspect of the present invention is a terminal device that performs wireless communication with a base station device, and includes a receiving unit that receives cell setting information regarding cell settings and group information indicating a group of cell settings from the base station device, an executing unit that executes mobility control based on L1 / L2 signaling, and a management unit that manages multiple cell settings based on the group information and the type of mobility control executed by the executing unit.

[0008] A base station device according to one aspect of the present invention is a base station device that performs wireless communication with a terminal device, and includes a classification unit that classifies each of a plurality of cell settings into groups based on the type of cell, a determination unit that determines management for the group, and a transmission unit that transmits cell setting information regarding the cell setting, group information indicating the group, and management information regarding management for the group to the terminal device.

[0009] A wireless communication method according to one aspect of the present invention is a wireless communication method used in a terminal device that performs wireless communication with a base station device, and includes receiving cell setting information regarding cell settings and group information indicating a group of cell settings from the base station device, performing mobility control based on L1 / L2 signaling, and managing multiple cell settings based on the group information and the type of mobility control performed. [Effects of the Invention]

[0010] According to the present invention, it is possible to appropriately manage settings of unused cells. [Brief explanation of the drawings]

[0011] [Figure 1] FIG. 1 is a diagram showing an example of a schematic configuration of an information communication system according to an embodiment. [Figure 2] FIG. 2 is a configuration diagram illustrating an example of the hardware configuration of a terminal device and a device unit according to an embodiment. [Figure 3] FIG. 3 is a diagram illustrating an example of mobility based on L1 / L2 signaling. [Figure 4] FIG. 4 is a configuration diagram showing an example of an architecture in NG-RAN. [Figure 5] FIG. 5 is a diagram illustrating an example of cell configuration in a base station device. [Figure 6] FIG. 6 is a configuration diagram illustrating an example of a functional block configuration of a terminal device according to an embodiment. [Figure 7] FIG. 7 is a configuration diagram illustrating an example of a functional block configuration of a base station device according to an embodiment. [Figure 8] FIG. 8 is a diagram illustrating a first example of a processing procedure performed by a wireless communication system according to an embodiment. [Figure 9] FIG. 9 is a diagram illustrating a first example of a processing procedure performed by a wireless communication system according to an embodiment. [Figure 10]FIG. 10 is a diagram illustrating a first example of a processing procedure performed by a wireless communication system according to an embodiment. [Figure 11] FIG. 11 is a diagram illustrating a second example of a processing procedure performed by a wireless communication system according to an embodiment. [Figure 12] FIG. 12 is a diagram illustrating a second example of a processing procedure performed by a wireless communication system according to an embodiment. [Figure 13] FIG. 13 is a flowchart illustrating an example of a processing procedure performed by a terminal device according to an embodiment. [Figure 14] FIG. 14 is a flowchart illustrating an example of a processing procedure performed by a base station device according to an embodiment. DETAILED DESCRIPTION OF THE INVENTION

[0012] An embodiment of the present invention will be described below. In the following description of the drawings, identical or similar parts are denoted by identical or similar reference numerals. However, the drawings are schematic. Therefore, specific dimensions and the like should be determined in light of the following description. Furthermore, it goes without saying that the dimensional relationships and ratios of parts included in the drawings differ from one another. Furthermore, the technical scope of the present invention should not be interpreted as being limited to the embodiment.

[0013] First, a schematic configuration of a wireless communication system according to an embodiment will be described with reference to Fig. 1. Fig. 1 is a diagram showing an example of a schematic configuration of a wireless communication system 100 according to an embodiment.

[0014] As shown in FIG. 1, the wireless communication system 100 includes terminal devices 10-1 to 10-m, base station devices 50-1 to 50-n, and a core network device 90.

[0015] The wireless communication system 100 is, for example, a wireless communication system that targets NR. Note that the present invention is applicable to any wireless communication system that includes at least a terminal device and a base station device, and is not limited to wireless communication systems that target NR. For example, the present invention is also applicable to LTE and LTE-Advanced. The present invention is also applicable to wireless communication systems that use NR as part of the wireless communication system. Hereinafter, LTE and LTE-Advanced are also referred to as E-UTRA (Evolved Universal Terrestrial Radio Access), but the meaning is the same. An area (coverage area) formed by a base station device is called a cell, and E-UTRA and NR are cellular communication systems built with multiple cells. The wireless communication system according to this embodiment may employ either TDD (Time Division Duplex) or FDD (Frequency Division Duplex), or different schemes may be applied to each cell.

[0016] Each of the terminal devices 10-1 to 10-m is wirelessly connected to one of the base station devices 50-1 to 50-n. Furthermore, each of the terminal devices 10-1 to 10-m may be wirelessly connected to two or more of the base station devices 50-1 to 50-n simultaneously. Each of the base station devices 50-1 to 50-n can use E-UTRA or NR as a communication method. For example, the base station device 50-1 may use NR and the base station device 50-n may use E-UTRA, or vice versa. A base station device in E-UTRA is referred to as an eNB (evolved NodeB), and a base station device in NR is referred to as a gNB (g-NodeB). Hereinafter, the term "base station device" includes both eNB and gNB. Furthermore, a terminal device in E-UTRA and NR is referred to as a UE (User Equipment). A base station apparatus gNB in ​​NR may connect to a terminal apparatus using a part of the bandwidth (BWP: Bandwidth part) of the frequency band it uses. Hereinafter, the term "cell" includes the BWP.

[0017] In addition, FIG. 1 illustrates terminal device 10-1 to terminal device 10-m as m terminal devices (m is an integer of 2 or more). In the following description, when these m terminal devices are described without distinction, some of the reference numerals are omitted and they are simply referred to as "terminal device 10." In addition, FIG. 1 illustrates base station device 50-1 to base station device 50-n as n base station devices (n is an integer of 2 or more). In the following description, when these n base station devices are described without distinction, some of the reference numerals are omitted and they are simply referred to as "base station device 50."

[0018] The terminal device 10 may be connected to the base station device 50 on a cell-by-cell basis, for example, and may be connected using multiple cells, for example, carrier aggregation. When the terminal device 10 is connected via multiple base station devices, that is, in the case of dual connectivity, the base station device to which it is initially connected is called a master node (MN), and the base station device to which it is additionally connected is called a secondary node (SN). The master node may also be called a primary node (PN). The base station devices are connected to each other via an inter-base station interface. Furthermore, the base station device 50 and the core network device 90 are connected to each other via a base station-core network interface. The inter-base station interface is used to exchange control signals and the like required for handover and coordinated operations between the base station devices.

[0019] The core network device 90, for example, has the base station device 50 under its control, and mainly handles load control between the base station devices, calling (paging) the terminal device 10, location registration, and other mobility control. NR defines an Access and Mobility Management Function (AMF) that manages access and mobility, and a Session Management Function (SMF) that manages sessions, as a group of control plane (C-plane) functions in the core network device 90. E-UTRA defines an MME (Mobility Management Entity) that corresponds to the AMF and SMF.

[0020] 1 shows an example in which the core network device 90 is configured as a single device, but the present invention is not limited to this. For example, the core network device 90 may be configured as a plurality of devices, including a server, a gateway, etc.

[0021] The terminal device 10 and the base station device 50 transmit and receive RRC messages in the Radio Resource Control (RRC) layer, and proceed with session processing (also referred to as a connection sequence). As the session processing proceeds, the terminal device 10 changes from an idle state (RRC Idle) to a connected state (RRC Connected) to the base station device 50. The idle state corresponds to a standby state of the terminal device 10.

[0022] Furthermore, the terminal device 10 and the base station device 50 transmit and receive MAC Control Elements (MAC CEs) in the Medium Access Control (MAC) layer. RRC messages are transmitted as RRC Protocol Data Units (PDUs), and the logical channels to which they are mapped include a Common Control Channel (CCCH), a Dedicated Control Channel (DCCH), a Paging Control Channel (PCCH), a Broadcast Control Channel (BCCH), or a Multicast Control Channel (MCCH). MAC CEs are transmitted as MAC PDUs (or MAC subPDUs). A MAC subPDU is equivalent to a Service Data Unit (SDU) in the MAC layer plus, for example, an 8-bit header, and the MAC PDU includes one or more MAC subPDUs.

[0023] Physical channels and physical signals related to this embodiment will be described below. Among the physical channels related to the embodiment of the present invention, a Physical Broadcast Channel (PBCH), a Primary Synchronization Signal (PSS), a Secondary Synchronization Signal (SSS), a Physical Random Access Channel (PRACH), and a Physical Downlink Control Channel (PDCCH) will be described below. Note that the wireless communication system according to this embodiment also includes at least a Physical Uplink Control Channel (PUCCH), a Physical Downlink Shared Channel (PDSCH), a Physical Uplink Shared Channel (PUSCH), a Sounding Reference Signal (SRS), and a Demodulation Reference Signal (DMRS), but detailed description thereof will be omitted.

[0024] <Physical Broadcast Channel (PBCH)> The physical broadcast channel (PBCH) is transmitted from the base station device 50 to the terminal device 10 and is used to notify common parameters (system information) in the cells under the control of the base station device 50. The system information is further classified into a master information block (MIB) and a system information block (SIB). The system information block is further subdivided into SIB1, SIB2, and so on and transmitted. The system information includes information necessary for connecting to a cell; for example, the MIB includes a system frame number and information indicating whether camping on to a cell is possible. Furthermore, the SIB1 includes parameters for calculating the quality of the cell (cell selection parameters), cell-common channel information (random access control information, PUCCH control information, PUSCH control information), scheduling information for other system information, and so on. Furthermore, the Physical Broadcast Channel (PBCH) is periodically transmitted as a synchronization signal block (SSB: Synchronization Signal Block (or SS / PBCH)) in combination with a synchronization signal consisting of a Primary Synchronization Signal (PSS) and a Secondary Synchronization Signal (SSS). By receiving the synchronization signal block (SSB), the terminal device 10 can acquire cell identifier (cell ID) information and reception timing, as well as measure the quality of the signal of the cell.

[0025] System information notified by a physical broadcast channel (PBCH) or the like is also called "system broadcast information" or "broadcast information." Camping on a cell refers to a state in which the terminal device 10 completes cell selection and / or cell reselection and selects a cell for monitoring system broadcast information and paging information. The terminal device 10 establishes the above-mentioned RRC connection with the base station device 50 that forms the camped-on cell.

[0026] <Primary Synchronization Signal (PSS)> The Primary Synchronization Signal (PSS) is used by the terminal device 10 to synchronize with the reception symbol timing and frequency of the downlink signal of the base station device 50. The Primary Synchronization Signal (PSS) is the signal that the terminal device 10 attempts to detect first in a procedure for detecting the cell of the base station device 50 (hereinafter also referred to as a "cell search procedure"). The Primary Synchronization Signal (PSS) uses three different signals, "0" to "2", repeatedly based on the physical cell ID. Note that the physical cell ID is an identifier of a physical cell, and 504 different IDs are used in E-UTRA, while 1008 different IDs are used in NR.

[0027] <Secondary Synchronization Signal (SSS)> The secondary synchronization signal (SSS) is used by the terminal device 10 to detect the physical ID of the base station device 50. Specifically, the secondary synchronization signal (SSS) is a signal used by the terminal device 10 to detect a physical cell ID in a cell search procedure. The secondary synchronization signal (SSS) repeatedly uses 168 different signals from "0" to "167" in E-UTRA and 336 different signals from "0" to "335" in NR based on the physical cell ID.

[0028] <Physical Random Access Channel (PRACH)> The physical random access channel (PRACH) is used by the terminal device 10 to transmit a random access preamble to the base station device 50. The physical random access channel (PRACH) is generally used in a state where uplink synchronization is not established between the terminal device 10 and the base station device 50, and is used for transmission timing adjustment information (timing advance) and uplink radio resource requests. Information indicating the radio resources available for transmitting the random access preamble is transmitted to the terminal device 10 using broadcast information or an RRC message.

[0029] <Physical Downlink Control Channel (PDCCH)> The Physical Downlink Control Channel (PDCCH) is transmitted from the base station device 50 to the terminal device 10 to notify the terminal device 10 of downlink control information (DCI). The downlink control information includes uplink radio resource information (uplink grant (UL grant)) that the terminal device 10 can use, or downlink radio resource information (downlink grant (DL grant)). The downlink grant is information indicating the scheduling of the Physical Downlink Shared Data Channel (PDSCH). The uplink grant is information indicating the scheduling of the Physical Uplink Shared Channel (PUSCH). When the Physical Downlink Control Channel (PDCCH) is transmitted in response to a random access preamble, the Physical Downlink Shared Data Channel (PDSCH) indicated by the Physical Downlink Control Channel (PDCCH) is a random access response, and includes index information of the random access preamble, transmission timing adjustment information, an uplink grant, etc.

[0030] <Hardware configuration> Next, the hardware configuration of a terminal device and a base station device according to an embodiment will be described with reference to Fig. 2. Fig. 2 is a configuration diagram showing an example of the hardware configuration of a terminal device 10 and a base station device 50 in an embodiment.

[0031] As shown in FIG. 2, the terminal device 10 and the base station device 50 each include, for example, a processor 21, a memory 22, a storage device 23, a communication device 24, an input device 25, an output device 26, and an antenna 27.

[0032] The processor 21 is configured to control the operation of each unit of the terminal device 10 or the base station device 50. The processor 21 is configured to include integrated circuits such as a CPU (Central Processing Unit), a DSP (Digital Signal Processor), an APU (Accelerated Processing Unit), an ASIC (Application Specific Integrated Circuit), a PLD (Programmable Logic Device), an FPGA (Field Programmable Gate Array), and an SoC (System-on-a-chip).

[0033] The memory 22 and the storage device 23 are configured to store programs, data, etc. The memory 22 is configured, for example, by a read-only memory (ROM), an erasable programmable read-only memory (EPROM), an electrically erasable programmable read-only memory (EEPROM), and / or a random access memory (RAM), etc. The storage device 23 is configured, for example, by a storage such as a hard disk drive (HDD), a solid state drive (SSD), and / or an embedded multi media card (eMMC).

[0034] The communication device 24 is configured to communicate via a wired and / or wireless network. The communication device 24 includes, for example, a network card, a communication module, etc. The communication device 24 may also include an amplifier, an RF (Radio Frequency) device that processes wireless signals, and a BB (BaseBand) device that processes baseband signals.

[0035] The RF device performs, for example, D / A (Digital to Analog) conversion, modulation, frequency conversion, power amplification, etc. on the digital baseband signal received from the BB device to generate a radio signal to be transmitted from the antenna 27. The RF device also performs frequency conversion, demodulation, A / D (Analog to Digital) conversion, etc. on the radio signal received from the antenna 27 to generate a digital baseband signal and transmit it to the BB device. The BB device performs a process of converting the digital baseband signal into an IP packet, and a process of converting the IP packet into a digital baseband signal.

[0036] The input device 25 is configured to allow a user to input information through an operation thereof. The input device 25 includes, for example, a keyboard, a touch panel, a mouse, and / or a microphone.

[0037] The output device 26 is configured to output information and includes a display device such as a liquid crystal display, an EL (Electro Luminescence) display, or a plasma display, and / or a speaker.

[0038] Antenna 27 is configured to emit and receive radio waves (electromagnetic waves) in one or more predetermined frequency bands. Antenna 27 may have no directionality, i.e., be omnidirectional. Omnidirectional antenna 27 has approximately equal gain from all directions in 360 degrees in the horizontal plane, the vertical plane, or both the horizontal and vertical planes.

[0039] The antenna 27 is not limited to a single antenna. When the base station device 50 has multiple antennas, they may be divided into a transmitting antenna and a receiving antenna, for example. When the multiple antennas are divided into transmitting antennas and receiving antennas, at least one of them may include multiple antennas. When the base station device 50 has multiple transmitting / receiving antennas or transmitting antennas, beamforming technology can be used.

[0040] Also, although not shown in the figures, the terminal device 10 and the base station device 50 may further include at least one of various sensors such as a GPS (Global Positioning System) receiver, an azimuth sensor, a gravity sensor, a temperature sensor, and an acceleration sensor, various biometric authentication functions such as fingerprint, retina, iris, face, and voiceprint, various devices such as a camera, a microphone, a speaker, and a light, and an input / output interface including a connection terminal.

[0041] <Overview of L1 / L2-based Mobility> Next, while referring to FIGS. 3 to 5, an overview of L1 / L2-based mobility will be described. FIG. 3 is a diagram for explaining an example of mobility based on L1 / L2 signaling. FIG. 4 is a configuration diagram showing an example of the architecture in the NG-RAN. FIG. 5 is a diagram for explaining an example of cell setting related to L1 / L2 signaling in the base station device 50.

[0042] As shown in FIG. 3, in the mobility based on L1 / L2 signaling, the base station device 50 notifies the terminal device 10 in advance of the cell setting information of candidate cells that are candidates for the connection destination. The cell setting information is information regarding the settings (also referred to as "cell settings") for communicating using the cell. Also, usually, cell setting information of a plurality of candidate cells is notified simultaneously. In the example shown in FIG. 3, the cell setting information "Config #0" of the candidate cell "Cell#0" and the cell setting information "Config #1" of the candidate cell "Cell#1" are notified. The cell setting information is a set of information parameters applied for the base station device 50 and the terminal device 10 to communicate within a certain cell, and includes, for example, at least a part of frequency, cell ID, bandwidth, reference signal pattern, area of the control channel, number of MIMO layers, physical downlink information, physical uplink information, measurement control information, timing information, and transmission power information.

[0043] When the terminal device 10 moves, for example, from the area of ​​the candidate cell "Cell #0" to the area of ​​the candidate cell "Cell #1", a handover is executed. At this time, L1 signaling or L2 signaling is transmitted from the base station device 50 to the terminal device 10. The L1 signaling is, for example, a physical downlink control channel (PDCCH). The L2 signaling is, for example, a MAC control element (MAC CE), but is not limited to this.

[0044] Based on the control information included in these signalings, the terminal device 10 changes the cell setting according to the cell setting information "Config #1" and switches the connection destination from the candidate cell "Cell #0" to the candidate cell "Cell #1" (i.e., applies the individual configuration set to continue communication in Cell #1). Also, when the terminal device 10 moves from within the area of ​​the candidate cell "Cell #1" to within the area of ​​the candidate cell "Cell #0", a handover is performed using a similar procedure. In this way, a handover based on L1 / L2 signaling is performed. At least one or both of L1 signaling and L2 signaling are collectively referred to as L1 / L2 signaling, and a mobility procedure based on L1 / L2 signaling is called L1 / L2-based mobility.

[0045] Note that handover based on L1 / L2 signaling, i.e., L1 / L2-based mobility, is not limited to the case shown in Figure 3. For example, in carrier aggregation technology that simultaneously transmits and receives using multiple carriers (multiple cells) or dual connectivity technology that aggregates carriers (cells) between multiple base station devices and transmits and receives, L1 / L2-based mobility may be used when changing the cell configuration, including that of a secondary cell (SCell) or a special cell (SpCell) that combines a primary cell (PCell) and a primary-secondary cell (PSCell). Furthermore, L1 / L2-based mobility does not only refer to switching the connected cell, but also includes switching the configuration within a cell. In addition, the connected cell may be a cell using the same frequency or a cell using a different frequency, and the number of cells may change before and after the switch.

[0046] Furthermore, a change of cell is usually triggered by wireless communication quality information regarding wireless communication quality measured by the terminal device 10. The measurement of wireless communication quality is performed based on synchronization signals (PSS, SSS) or a downlink reference signal, such as a CSI-RS (Channel State Information-Reference Signal). The wireless communication quality information includes, for example, at least one of RSRP (Reference Signal Received Power), which indicates the received power value at the terminal device 10 of a signal transmitted in a cell formed by the base station device 50, RSSI (Received Signal Strength Indication), which indicates the received signal strength, RSRQ (Reference Signal Received Quality), which indicates the received power quality, and SINR (Signal to Interference Noise Ratio), which indicates the signal to interference noise ratio. In L1 / L2-based mobility, the terminal device 10 may use L1 measurements and / or L2 measurements as the wireless communication quality information. The base station device 50 may notify the terminal device 10 of the wireless communication quality information used by the terminal device 10 by broadcast information or an individual RRC message.

[0047] As shown in Figure 4, in an NG-RAN (New Generation RAN) using NR, each base station device (gNB) may include a centralized node (CU) and a distributed node (DU). In a base station device (gNB), one or more distributed nodes (DUs) may be connected to one centralized node (CU). The interface between base station devices is an Xn-C interface, and the interface between a 5G core (5GC) and a base station device is an NG interface. Note that the gNB-CU may be further separated into a gNB-CU-CP, which is a control plane, and a gNB-CU-UP, which is a user plane.

[0048] As shown in Fig. 5, each distributed node (DU) forms one or more cells. In the example shown in Fig. 5, the distributed node of "DU#0" forms two cells: one whose cell setting information is "Config#0" and the other whose cell setting information is "Config#1". On the other hand, the distributed node of "DU#1" forms a cell whose cell setting information is "Config#2". The cells of Config#0 and Config#1 may be on the same frequency or on different frequencies.

[0049] Therefore, cell changes in NG-RAN occur between different cells in the same distributed node (intra-DU inter-cell) or between different distributed nodes in the same aggregation node (intra-CU inter-DU).

[0050] <Function block configuration> (Terminal Device) Next, a functional block configuration of a terminal device according to an embodiment will be described with reference to Fig. 6. Fig. 6 is a configuration diagram showing an example of a functional block configuration of the terminal device 10 in an embodiment. Note that Fig. 6 is intended to show the functional blocks required in this embodiment, and does not exclude the terminal device 10 from including functional blocks other than those shown.

[0051] As shown in FIG. 6, the terminal device 10 includes a receiving unit 11, a measuring unit 12, a transmitting unit 13, an executing unit 14, and a managing unit 15 as functional blocks.

[0052] The receiver 11 is configured to receive cell setting information related to cell setting and group information indicating a group of cell settings from the base station device 50. The receiver 11 may receive the cell setting information and the group information together or separately.

[0053] The multiple cell configurations are classified into groups based on the cell type. The classification of the groups is performed by the base station device 50. The group information is a letter, a symbol, a number, or a combination thereof that represents the group. Specifically, the group information is an identifier such as a group index, which will be described later. The base station device 50 transmits the group information, for example, by including it in an RRCReconfiguration message, which is a radio resource configuration signal, and the receiver 11 receives the group information by receiving this message from the base station device 50.

[0054] The measurement unit 12 is configured to measure the wireless communication quality of the cell of the cell setting received by the reception unit 11. As described above, the measurement of the wireless communication quality is performed based on the synchronization signals (PSS, SSS) or CSI-RS, etc. The measured wireless communication quality is, for example, at least one of the above-described RSRP, RSSI, RSRQ, SINR, etc. The measured wireless communication quality is transmitted by the transmission unit 13 to the base station device 50 and reported.

[0055] The execution unit 14 is configured to execute mobility control based on L1 / L2 signaling. More specifically, when receiving the L1 / L2 signaling, the execution unit 14 is configured to control the above-mentioned L1 / L2-based mobility between the base station device 50 and the base station device 50 based on control information included in the signaling. When the execution unit 14 executes mobility control based on the L1 / L2 signaling, for example, as described above, a handover is performed from a currently connected cell to a new destination cell.

[0056] The management unit 15 is configured to manage a plurality of cell configurations based on the group information received by the receiving unit 11 and the type of mobility control executed by the executing unit 14. More specifically, the management unit 15 is configured to manage a plurality of cell configurations for each group. Based on the group information received by the receiving unit 11 and the type of mobility control executed by the executing unit 14, the management unit 15 is able to autonomously manage a plurality of cell configurations for each group.

[0057] In this way, the terminal device 10 manages multiple cell configurations based on group information and the type of mobility control, thereby making it possible to manage multiple cell configurations for each group to which each belongs, depending on the type of mobility control executed. Therefore, it is possible to manage cell configurations more appropriately than in the past.

[0058] Specifically, the management unit 15 holds or releases information on a plurality of cell settings, i.e., a plurality of pieces of cell setting information, based on the group information received by the receiving unit 11 and the type of mobility control executed by the executing unit 14. This makes it possible to suppress signaling overhead and prevent the monopoly of resources for individual cell settings.

[0059] Furthermore, the management unit 15 may be configured to manage multiple cell configurations based on the group information, the type of mobility control, and also on the measurement results by the measurement unit 12. This makes it possible to manage multiple cell configurations for each group and according to the measured wireless communication quality. Therefore, it is possible to manage cell configurations more appropriately than in the past.

[0060] The receiving unit 11 and the transmitting unit 13 may be realized by, for example, the antenna 27 and the communication device 24, or may be realized by the communication device 24 and the processor 21 executing a program stored in the storage device 23. The measuring unit 12, the executing unit 14, and the managing unit 15 may be realized by the processor 21 executing a program stored in the storage device 23. When a program is executed, the program may be stored in a storage medium. The storage medium storing the program may be a non-transitory computer-readable medium. The non-transitory storage medium is not particularly limited, and may be, for example, a storage medium such as a USB (Universal Serial Bus) memory or a CD-ROM (Compact Disc ROM).

[0061] (Base station equipment) Next, a functional block configuration of a base station device according to one embodiment will be described with reference to Fig. 7. Fig. 7 is a configuration diagram showing an example of a functional block configuration of a base station device 50 in one embodiment. Note that Fig. 7 is intended to show functional blocks required in this embodiment, and does not exclude the base station device 50 from including functional blocks other than those shown.

[0062] As shown in FIG. 7, the base station device 50 includes a classification unit 51, a determination unit 52, and a transmission unit 53 as functional blocks.

[0063] The classification unit 51 is configured to classify each of the plurality of cell configurations into groups based on the cell type. That is, each cell configuration is grouped into one of the plurality of groups depending on the cell type of the cell configuration. The classification criteria include, for example, whether or not the cell in the currently configured cell configuration is the same cell (intra-cell), whether or not it is a cell in the same distributed node (intra-DU cell), whether or not it is a cell in the same aggregation node (intra-CU cell), etc.

[0064] The determination unit 52 is configured to determine management for the groups classified by the classification unit 51. The determination unit 52 may determine management for each of the multiple groups, or may determine management for some of the multiple groups.

[0065] Management of the group is determined based on various viewpoints, criteria, factors, etc. For example, the determination unit 52 may be configured to determine management of the group when mobility control based on L1 / L2 signaling occurs in the terminal device 10.

[0066] Furthermore, the management of a group includes, for example, activating or deactivating a cell configuration belonging to the group. Alternatively, the management of a group may include keeping or releasing (deleting, releasing) corresponding cell configuration information for one or more cell configurations classified into the group.

[0067] Note that if the base station device 50 is equipped with the determination unit 52, the terminal device 10 does not need to be equipped with the above-mentioned management unit 15. Conversely, if the terminal device 10 is equipped with the above-mentioned management unit 15, the base station device 50 does not need to be equipped with the determination unit 52. In other words, it is sufficient if either the management unit 15 of the terminal device 10 or the determination unit 52 of the base station device 50 fulfills its function (role).

[0068] The transmission unit 53 is configured to transmit cell setting information related to cell setting, group information indicating a group, and management information related to management of the group to the terminal device 10. The transmission unit 53 may transmit the cell setting information, the group information, and the management information separately, or may transmit at least some of them together. As described above, the transmission unit 53 may transmit, for example, the group information included in an RRCReconfiguration message.

[0069] In this way, the base station device 50 transmits the cell setting information, group information, and management information to the terminal device 10, thereby enabling the terminal device 10 to manage a plurality of cell settings for each group to which each belongs in accordance with the determined management. Therefore, compared to the conventional method, the cell settings can be managed more appropriately.

[0070] Furthermore, when the terminal device 10 is made to perform mobility control based on L1 / L2 signaling, the terminal device 10 can be made to decide the management for the group, so that the management for the cell settings belonging to each group can be decided for each group depending on the type of mobility control that has occurred.

[0071] Furthermore, the management information transmitted by the transmitter 53 may include, for example, activation information for activating a cell configuration belonging to a group or deactivation information for deactivating a cell configuration belonging to a group, thereby enabling the cell configuration to be activated or deactivated for each group.

[0072] The transmitting unit 53 may be realized by, for example, the communication device 24, or may be realized by the communication device 24 and the processor 21 executing a program stored in the storage device 23. The classifying unit 51 and the determining unit 52 may be realized by the processor 21 executing a program stored in the storage device 23. When a program is executed, the program may be stored in a storage medium. The storage medium storing the program may be a computer-readable non-transitory storage medium. The non-transitory storage medium is not particularly limited, and may be, for example, a storage medium such as a USB memory or a CD-ROM.

[0073] <Processing Procedure> Next, a processing procedure performed by the wireless communication system according to an embodiment will be described with reference to FIGS.

[0074] 8 to 10 are diagrams for explaining a first example of a processing procedure performed by a wireless communication system according to an embodiment. FIGS. 11 to 12 are diagrams for explaining a second example of a processing procedure performed by a wireless communication system according to an embodiment. For simplicity of explanation, FIGS. 8 to 12 mainly explain the processing procedure between the base station device 50 and the terminal device 10 among the processing procedures of the wireless communication system 100 shown in FIG. 1, and omit explanation of the processing procedure between the base station device 50 and the core network device 90. Also, in FIGS. 8 and 11, the terminal device 10 is also expressed as a "UE," the base station device 50 is also expressed as a "gNB," one cell of multiple cells formed by the base station device 50 is also expressed as a "Source Cell," and one of multiple candidate cells other than the cell is also expressed as a "Target Cell."

[0075] (First example of processing procedure) As shown in Fig. 8, when cell setting information related to the cell setting (L1 / L2-based mobility configuration) of a "Target Cell" among multiple candidate cells is notified from the distributed node (DU) of the "Target Cell" to the distributed node (DU) of the "Source Cell" (step S101), the receiving unit 11 of the terminal device 10 receives the cell setting information and group information related to the cell setting group from the base station device 50 (step S102). The cell setting information of the candidate cell is transmitted, for example, included in an RRCReconfiguration message. Note that it is also possible to use an RRC message other than the RRCReconfiguration message (for example, RRCSetup, RRCResume, RRCReestablishment).

[0076] In the first example, the cell configuration of each candidate cell is classified into several groups according to the type of the cell. In the example shown in Fig. 8, each cell configuration belongs to one of the following three groups: "G1":(Intra-cell)Configuration Change "G2": Intra-DU Cell Change "G3": Inter-DU Cell Change

[0077] In the first example, the classification unit 51 of the base station device 50 groups multiple cell configurations based on the relationship with the serving cell to the terminal device 10. Then, the classification unit 51 of the base station device 50 adds information (for example, "G1," "G2," or "G3") that allows the terminal device 10 to identify each group as group information and stores the group information. The transmission unit 53 of the base station device 50 transmits the added group information to the terminal device 10. The transmission unit 53 of the base station device 50 may transmit the group information to the terminal device 10 together with the cell configuration information (L1 / L2-based mobility configuration), or may transmit the group information to the terminal device 10 by including it in an RRC message separately from the cell configuration information (L1 / L2-based mobility configuration). The base station device 50 may further notify the terminal device 10 of an ID that indicates a link between the cell configuration information and the group information, and may set an association between the cell configuration information and the group information by adding, deleting, or changing the ID.

[0078] Note that the group and its group information for each cell setting are not limited to being determined and explicitly notified by the base station device 50. For example, the Configuration Change may determine (judge, decide, identify) that the group information is "G1" because the cell frequency and cell ID are the same as those of the cell to which the terminal device 10 is connected, or the Configuration Change does not include this information. Alternatively, the terminal device 10 in the first example may determine that the group information is "G1" when conventional intra-cell cell setting information is notified, and may implicitly determine that the group information is "G2" or "G3" depending on additional information such as the frequency. For example, the terminal device 10 may determine that the group information is "G2" when different frequency information is set, or may determine that the group information is "G3" when different frequency information and cell ID are set.

[0079] Next, the terminal device 10 transmits an RRCReconfigurationComplete message, which is a completion notification corresponding to the RRCReconfiguration message, to the base station device 50 (step S103). Then, the measurement unit 12 of the terminal device 10 measures the wireless communication quality between the terminal device 10 and the current cell, “Source Cell,” and reports (transmits) the measurement result to the base station device 50 by including it in a MeasurementReport message (step S104). The measurement result may be triggered based on a measurement event prepared for L1 / L2-based mobility, or may be reported periodically, or the measurement trigger condition of conventional L3 measurement (e.g., Event-A3) may be reused. The wireless communication quality may use RSRP or a measurement value such as RSRQ. Furthermore, a synchronization signal (PSS / SSS) or CSI-RS may be used as a downlink physical signal used for measurement. The downlink physical signal used for measurement may be specified by the base station device 50 for each group or for each cell. The base station device 50 determines the occurrence of a mobility event based on this measurement report (step S105).

[0080] As shown in FIG. 9, the mobility events determined by the base station device 50 include, for example, the following three events. "ME1": Change of cell configuration information within the same cell "ME2": Cell change within the same distributed node "ME3": Cell change between different distributed nodes

[0081] If it is determined in step S105 that a mobility event has occurred, the base station device 50 in the first example notifies the terminal device 10 of L1 / L2 signaling (step S106). This L1 / L2 signaling includes at least information for identifying target cell information (or cell setting information) as mobility event information corresponding to the mobility event determined to have occurred.

[0082] In step S106, when notifying L1 / L2 signaling indicating that the mobility event information is "ME3," that is, mobility event information corresponding to a cell change between different distributed nodes (Inter-DU cell Change), the base station device 50 in the first embodiment may simultaneously notify the terminal device 10 of radio resource information (cell setting information) used in the mobility event, such as a dedicated RA preamble. In this case, it is possible to introduce a new DCI (Downlink Control Indicator) format for the physical downlink control channel (PDCCH) and perform notification using some of the bits in the format. Also, the base station device 50 may be configured to notify the terminal device 10 in advance of a plurality of pieces of radio resource information using an RRC message (for example, RRCReconfiguration), and to notify an identifier indicating the radio resource information to be applied in the DCI format in the L1 / L2 signaling (PDCCH). Alternatively, the base station device 50 may be configured to notify the terminal device 10 of an identifier indicating the radio resource information to be applied using L1 / L2 signaling (MAC CE). When the mobility event is completed, the terminal device 10 may release (delete, release) the specified radio resource information (cell setting information).

[0083] Next, the execution unit 14 of the terminal device 10 in the first example executes mobility control based on L1 / L2 signaling between the terminal device 10 and the candidate cell "Target Cell" (step S108). That is, an L1 / L2-based mobility procedure is performed. After completing the L1 / L2-based mobility procedure, the terminal device 10 notifies an ACK message to the "Target Cell", which is the new connection destination (step S108).

[0084] For a cell change between different distributed nodes (Inter-DU cell change), if the L1 / L2-based mobility procedure is successful, the terminal device 10 in embodiment 1 may change the group information to "G2", i.e., Intra-DU Cell Change, for a cell setting in which group information is "G3", i.e., Inter-DU Cell Change is specified, and for a cell group in the same group as the Target Cell. Similarly, conversely, for a cell setting in which group information is "G2", i.e., Intra-DU Cell Change is specified, the group information may be changed to "G3", i.e., Inter-DU Cell Change.

[0085] Then, after completing the L1 / L2-based mobility procedure, the management unit 15 of the terminal device 10 in the first example manages the cell configuration of multiple candidate cells in group units (step S109). The management of the cell configuration is performed based on the group information and mobility event information received from the base station device 50. The management of the cell configuration includes, for example, holding, releasing, and changing the cell configuration information.

[0086] For example, the management unit 15 of the terminal device 10 may store the management table shown in FIG. 10 in advance in the memory 22 or the storage device 23, etc., and manage cell configuration in accordance with the management table. When the mobility event information is "ME1", the cell configuration information is held (maintained, Keep) for any of the group information of the cell configuration, "G1", "G2", and "G3". When the mobility event information is "ME2", the cell configuration information of the group information "G1" is released (deleted, Release), and the cell configuration information of the group information "G2" or "G3" is held (Keep). When the mobility event information is "ME3", the cell configuration information of the group information "G1" or "G2" is released (Release), and the cell configuration information of the group information "G3" is held (Keep). The terminal device 10 may also store information and a determination procedure that can obtain management results similar to those of FIG. 10.

[0087] It should be noted that the determination of whether to retain or release the cell setting information in the terminal device 10 is not limited to being based on group information and mobility event information. The management unit 15 of the terminal device 10 in the first example may take into account wireless communication quality measured based on a synchronization signal (SS) or CSI-RS in addition to the group information and mobility event information. For example, the management unit 15 of the terminal device 10 may retain only the cell setting information of cells whose wireless communication quality is equal to or higher than a predetermined quality among the cell settings belonging to a group determined to be retained based on the group information and mobility event information, and may release the cell setting information of cells whose wireless communication quality is lower than the predetermined quality. The threshold indicating the predetermined quality may be specified by the base station device 50. Furthermore, the synchronization signal or CSI-RS used for measurement may be specified by the base station device 50.

[0088] (Second example of processing procedure) In the examples of FIGS. 11 and 12, the base station device (gNB) includes three distributed nodes (DUs): "DU#0", "DU#1", and "DU#2".

[0089] Note that step S151 shown in FIG. 11 is the same as step S101 shown in FIG. 8 described above, steps S153 to S155 are the same as steps S103 to S105 shown in FIG. 8 described above, and steps S157 to S158 are the same as steps S107 to S108 shown in FIG. 8 described above, and therefore, explanations of each step will be omitted as appropriate.

[0090] 11, in the base station device 50, after the cell setting information related to the cell setting (L1 / L2-based mobility configuration) of the "Target Cell" is notified in step S151, the transmission unit 53 transmits the cell setting information and group information related to the groups classified by the classification unit 51 to the terminal device 10 (step S152). In the second example, similar to the first example, the cell setting information is transmitted in an RRCReconfiguration message.

[0091] The group information transmitted by the transmitter 53 of the base station device 50 in the second example is an index set for each group, and is a group index representing that group.

[0092] As shown in FIG. 12, the classification unit 51 of the base station device 50 in the second example groups a plurality of cell configurations into one of a plurality of groups, as in the second example. Then, the base station device 50 sets a group index for each group, and the transmission unit 53 of the base station device 50 notifies the terminal device 10 of the group index. In the example shown in FIG. 12, a group index "Index#0" is assigned to two pieces of cell configuration information "Config#0" and "Config#1" in the distributed node (DU) of "DU#0". Furthermore, of the three pieces of cell configuration information in the distributed node (DU) of "DU#1", a group index "Index#1" is assigned to one piece of cell configuration information "Config#2", and a group index "Index#2" is assigned to two pieces of cell configuration information "Config#3" and "Config#3". Furthermore, a group index "Index#3" is assigned to two pieces of cell configuration information "Config#5" and "Config#6" in the distributed node (DU) of "DU#2". The transmitting unit 53 of the base station device 50 may transmit the set group index together with the cell setting information (L1 / L2-based mobility configuration) to the terminal device 10, or may include the set group index in an RRC message separately from the cell setting information (L1 / L2-based mobility configuration) and transmit it to the terminal device 10. The base station device 50 may further notify an ID indicating a link between the cell setting information and the group index, and set an association between the cell setting information and the group index by adding, deleting, or changing the ID.

[0093] Furthermore, if it is determined in step S155 that a mobility event has occurred, the base station device 50 in the second example notifies the terminal device 10 of L1 / L2 signaling (step S156). This L1 / L2 signaling includes at least information for identifying target cell information (or cell setting information) as mobility event information corresponding to the mobility event determined to have occurred.

[0094] At this time, the determination unit 52 of the base station device 50 determines management for the group of cell settings, and the transmission unit 53 of the base station device 50 transmits management information relating to management for the determined group to the terminal device.

[0095] In this way, the base station device 50 in the second example determines (controls) the management of cell settings of multiple candidate cells, and the terminal device 10 in the second example manages the cell settings based on the determination (control) by the base station device 50. Management of cell setting information in the second example is performed by the terminal device 10 when a mobility event occurs, as in the first example, or is performed by the terminal device 10 individually when notified by the PDCCH or MAC control element (MAC CE).

[0096] More specifically, the decision unit 52 of the base station device 50 designates activation or deactivation for each group indicated by the group index of the cell configuration. The decision unit 52 of the base station device 50 notifies the terminal device 10 of the designated activation / deactivation by L1 / L2 signaling. Then, based on the activation / deactivation designated for each group, the terminal device 10 activates or deactivates the cell configuration included in the group.

[0097] Whether to activate or deactivate a cell configuration is not limited to being based on the designated activation / deactivation. The terminal device 10 in the second example may take into consideration the wireless communication quality measured based on the synchronization signal (SS) or CSI-RS. For example, among the cell configuration information belonging to a group designated as activation, only the cell configuration information of cells whose wireless communication quality is equal to or higher than a predetermined quality may be activated, and the cell configuration information of cells whose wireless communication quality is lower than the predetermined quality may be deactivated. The threshold indicating the predetermined quality may be designated by the base station device 50. Furthermore, the synchronization signal or CSI-RS used for measurement may be designated by the base station device 50.

[0098] 12, when the terminal device 10 is in the cell of the distributed node (DU) of "DU#0" (when connected to the cell formed by this DU), the decision unit 52 of the base station device 50 designates Activation for the group of group index "Index#0" in order to accommodate changes between different cells of the same distributed node. Also, when a cell of cell setting information "Config#2" is adjacent to the cell of the distributed node (DU) of "DU#0" but the cells of other cell setting information "Config#3" to "Config#6" are not adjacent, the decision unit 52 of the base station device 50 designates Activation for the group of group index "Index#1" and designates Deactivation for the groups of group indices "Index#2" and "Index#3".

[0099] 12, when the terminal device 10 moves and attempts to move into a cell of a distributed node (DU) of "DU#1", for example, a cell with cell setting information "Config#2", the determination unit 52 of the base station device 50 determines that there is no cell setting information corresponding to the same group, and designates Deactivation for the group with group index "Index#1". On the other hand, when cells with cell setting information "Config#0", "Config#1", and "Config#3" to "Config#6" are adjacent to the cell setting information "Config#2", the determination unit 52 of the base station device 50 designates Activation for the groups with group indexes "Index#0", "Index#2", and "Index#3".

[0100] 12, when the terminal device 10 moves and attempts to move into the cell of the distributed node (DU) of "DU#2", the decision unit 52 of the base station device 50 specifies Activation for the group of group index "Index#3" in order to accommodate changes between different cells of the same distributed node. Also, when a cell of cell setting information "Config#2" is adjacent to the cell of the distributed node (DU) of "DU#2", but the cells of other cell setting information "Config#0", "Config#1", "Config#3", and "Config#4" are not adjacent, the decision unit 52 of the base station device 50 specifies Activation for the group of group index "Index#1", and specifies Deactivation for the groups of group indices "Index#0" and "Index#2".

[0101] In addition, when a mobility event occurs and the base station device 50 in the second example notifies L1 / L2 signaling corresponding to a cell change (Inter-DU cell Change) between different distributed nodes, particularly when notifying activation to the terminal device 10, the base station device 50 may simultaneously notify the terminal device 10 of radio resource information (cell setting information) used in the mobility event, such as a dedicated RA preamble.

[0102] Furthermore, when a mobility event occurs, the terminal device 10 and the decision unit 52 of the base station device 50 in the second example may keep only the cell configuration of the same group activated, and deactivate the cell configuration of other groups. In this case, the decision unit 52 of the base station device 50 may notify the terminal device 10 of a deactivation timer when deactivating the cell configuration of a certain group. The deactivation timer may be started upon completion of the mobility event, or may be restarted based on L1 / L2 signaling (particularly MAC-CE) from the base station device 50. Furthermore, if the cell configuration information of the deactivated group includes individual parameters such as a dedicated RA preamble, the terminal device 10 in the second example may release (delete, release) the cell configuration information. The release may be for only the related parameters, or for each piece of cell configuration information. Furthermore, as a result of the release, a group that has no cell setting information to which it belongs (null) may be autonomously deleted by the terminal device 10 in the second example, or may be explicitly deleted by the base station device 50.

[0103] In the second example, the terminal device 10 does not need to know the type of each group. The terminal device 10 only needs to manage the cell setting information based on the activation / deactivation decision (control) specified for each group by the decision unit 52 of the base station device 50.

[0104] Next, processing procedures performed by a terminal device and a base station device according to an embodiment will be described with reference to Fig. 13 and Fig. 14. Fig. 13 is a flowchart for describing an example of processing procedures performed by a terminal device 10 in an embodiment. Fig. 14 is a flowchart for describing an example of processing procedures performed by a base station device 50 in an embodiment. Note that Fig. 13 describes the processing procedures of the terminal device 10 in a first example of processing procedures performed by a wireless communication system, and Fig. 14 describes the processing procedures of the base station device 50 in a second example of processing procedures performed by a wireless communication system.

[0105] In the following description, it is assumed that an RRC connection has been established between the terminal device 10 and the base station device 50 in advance, and that they are in a connected state (RRC Connected) using a predetermined frequency band.

[0106] (Terminal device processing procedure) As shown in FIG. 13, first, the receiver 11 receives cell setting information related to cell setting and group information related to a group of cell settings from the base station device 50 (S201).

[0107] Next, the terminal device 10 determines whether a mobility event has occurred (S202). In practice, the determination of the occurrence of a mobility event is performed by the base station device 50. Therefore, the terminal device 10 determines the occurrence of a mobility event based on whether L1 / L2 signaling has been received from the base station device 50 and on mobility event information that may be included in the L1 / L2 signaling. Then, steps S201 and S202 are repeated until it is determined that a mobility event has occurred.

[0108] If it is determined in step S202 that a mobility event has occurred, the execution unit 14 executes mobility control based on L1 / L2 signaling between the execution unit 14 and the base station device 50 (step S203).

[0109] Next, the management unit 15 manages a plurality of cell configurations based on the group information received in step S201 and the type of mobility control executed in step S203 (step S204). The plurality of cell configurations are managed for each group to which each cell configuration belongs.

[0110] (Base station equipment processing procedure) 14, first, the classification unit 51 classifies each of the multiple cell configurations into groups based on the cell type (S251). The cell type is based on, for example, the relationship between the cell in the cell configuration and the serving cell.

[0111] Next, the determination unit 52 determines the management of the cell configuration group (S252).

[0112] Next, the transmitting unit 53 transmits the cell setting information, the group information, and the management information to the terminal device 10 (S253). As described above, the cell setting information, the group information, and the management information may be transmitted at different times, or may be transmitted together at the same time.

[0113] The order of the sequences and flowcharts described in this embodiment may be changed as long as no contradiction occurs in the processing.

[0114] Furthermore, the processes described in the present embodiment may be implemented by hardware in the device, or may be implemented by a processor executing a program stored in a storage device. When a program is executed, the program may be stored in a storage medium. The storage medium storing the program may be a computer-readable non-transitory storage medium. The non-transitory storage medium is not particularly limited, and may be, for example, a storage medium such as a USB memory or a CD-ROM.

[0115] An exemplary embodiment of the present invention has been described above. According to the terminal device 10 and wireless communication method of this embodiment, multiple cell configurations are managed based on group information and the type of mobility control. This makes it possible to manage multiple cell configurations for each group to which they belong, depending on the type of mobility control executed. Therefore, cell configurations can be managed more appropriately than in the past. Therefore, the technology according to this embodiment can contribute to achieving Goal 9 of the Sustainable Development Goals (SDGs), "Build resilient infrastructure and promote inclusive and sustainable industrialization."

[0116] Furthermore, according to the base station device 50 of the present embodiment, cell setting information, group information, and management information are transmitted to the terminal device 10. This makes it possible for the terminal device 10 to manage a plurality of cell settings for each group to which each belongs, in accordance with the determined management. Therefore, cell settings can be managed more appropriately than in the past.

[0117] The above-described embodiments are intended to facilitate understanding of the present invention and are not intended to limit the scope of the present invention. The present invention may be modified or improved without departing from its spirit, and equivalents are also included within the scope of the present invention. In other words, designs modified by those skilled in the art as appropriate are also encompassed within the scope of the present invention as long as they incorporate the characteristics of the present invention. For example, the elements of the embodiments, their arrangement, materials, conditions, shapes, sizes, etc., are not limited to those illustrated and can be modified as appropriate. Furthermore, the embodiments are merely examples, and partial substitution or combination of the configurations shown in different embodiments is, of course, possible. These are also encompassed within the scope of the present invention as long as they incorporate the characteristics of the present invention. [Explanation of symbols]

[0118] 10, 10-1, 10-2, 10-m...terminal device, 11...receiving unit, 12...measuring unit, 13...transmitting unit, 14...executing unit, 15...management unit, 21...processor, 22...memory, 23...storage device, 24...communication device, 25...input device, 26...output device, 27...antenna, 50, 50-1, 50-n...base station device, 51...classification unit, 52...determination unit, 53...transmitting unit, 90...core network device, 100...wireless communication system.

Claims

1. A terminal device that performs wireless communication with a base station device, a receiving unit that receives cell setting information related to cell setting from the base station device; an execution unit that executes mobility control based on L1 / L2 signaling based on the cell configuration information; a management unit that deletes a predetermined cell configuration from among the plurality of cell configurations based on information received from the base station device, the management unit deletes the plurality of cell configurations based on information received from the base station device. Terminal device.

2. The cell configuration is identifiable by a cell ID. The terminal device according to claim 1 .

3. A terminal device that performs wireless communication with a base station device, a receiving unit that receives cell setting information related to cell setting from the base station device; an execution unit that executes mobility control based on L1 / L2 signaling based on the cell configuration information; a management unit that deletes a predetermined cell configuration from among the plurality of cell configurations based on information received from the base station device, The receiving unit receives group information indicating the group of the cell configuration from the base station device. death, The management unit retains or deletes the plurality of pieces of cell setting information based on the group information and the type of mobility control executed by the execution unit. Terminal device.

4. a measurement unit for measuring wireless communication quality between the cell and the cell setting; a transmitter that transmits the wireless communication quality measured by the measurement unit to the base station device. The terminal device according to claim 1 .

5. A base station device that performs wireless communication with a terminal device, a transmitting unit that transmits cell setting information related to cell setting to the terminal device; an execution unit that executes mobility control based on L1 / L2 signaling based on the cell setting information, The transmission unit instructs the terminal device to delete a predetermined cell setting from among the plurality of cell settings by transmitting management information to the terminal device; The transmission unit instructs the terminal device to delete the plurality of cell configurations by transmitting the management information to the terminal device. Base station equipment.

6. a classification unit that classifies each of the plurality of cell settings into groups based on the type of the cell; The management information includes activation information for activating the cell setting belonging to the group or deactivation information for deactivating the cell setting belonging to the group. The base station device according to claim 5 .

7. a classification unit that classifies each of the plurality of cell settings into a group based on the type of the cell; and a determination unit that determines management of the group when mobility control based on L1 / L2 signaling occurs in the terminal device. The base station device according to claim 5 .

8. A wireless communication method used in a terminal device that performs wireless communication with a base station device, receiving cell setting information relating to a cell setting from the base station device; performing mobility control based on L1 / L2 signaling based on the cell configuration information; and deleting a predetermined cell configuration from among the plurality of cell configurations based on information received from the base station device; The deleting includes deleting the plurality of cell configurations based on information received from the base station device. Wireless communication method.

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