Terminal, base station, and communication method

Abstract

This terminal comprises: a reception unit that receives system information pertaining to a plurality of second cells in a first cell; and a control unit that holds the system information pertaining to the plurality of second cells and applies the system information in a second cell at a movement destination.

Description

Terminal, Base Station, and Communication Method

[0001] The present disclosure relates to a terminal, a base station, and a communication method applicable to movement between cells of a network to which energy reduction is applied.

[0002] The 3rd Generation Partnership Project (3GPP: registered trademark) has standardized the 5th generation mobile communication system (also called 5G, New Radio (NR), or Next Generation (NG)), and is also proceeding with the standardization of the next generation, called Beyond 5G, 5G Evolution, or 6G.

[0003] A 5G base station periodically transmits a synchronization signal (SS) and system information (SIB: System Information Block) in each cell. A terminal (also called UE: User Equipment) in the RRC_Idle state performs cell search using the SS, obtains SIB1 information included in the system information notified by the searched cell, etc., executes cell selection, and accesses ( camps on) the cell. Some of the system information obtained in a certain cell (for example, SIB information after SIB2) can also be used in another cell within a predetermined area, and there is no need to newly obtain information even if moving from one cell to another cell. (Non-Patent Document 1)

[0004] 3GPP TS 38.331 V18.4.0, 3rd Generation Partnership Project;Technical Specification Group Radio Access Network; Evolved Universal Terrestrial Radio Access (E-UTRA); Radio Resource Control (RRC); Protocol specification (Release 18), 3GPP, January 2025

[0005] 6G may use high-frequency bands that consume a lot of power to support services such as high-speed, high-capacity services, so it may be designed with Network Energy Saving (NES) in mind to reduce power consumption.

[0006] From an NES perspective, it is conceivable to introduce a concept that distinguishes between cells responsible for transmitting essential broadcast information (MIB, SIB) for network access and cells responsible for other communications, and to omit or reduce the transmission of all or part of the broadcast information in the latter cells.

[0007] In such cases, terminals cannot obtain the necessary information in cells where all or part of the notification information is omitted or reduced, so the challenge becomes how to enable rapid movement between such cells.

[0008] Therefore, the following disclosure is made in light of these circumstances and aims to provide terminals, base stations, and communication methods that enable rapid movement between cells where the transmission of all or part of the broadcast information is omitted or reduced.

[0009] One aspect of the present disclosure is a terminal (200) comprising, in a first cell, a receiving unit (210) that receives system information of a plurality of second cells, and a control unit (230) that holds the system information of the plurality of second cells and applies the system information in the second cell to which it is moved.

[0010] One aspect of the present disclosure is a base station (100) comprising a control unit (130) that adds affiliation information to which the second cell belongs, which is transmitted in the second cell, to the system information of the second cell, and a transmission unit (110) that transmits the system information of the second cell to which the affiliation information has been added in the first cell.

[0011] One aspect of the present disclosure is a communication method for a terminal (200) that includes the steps of: receiving system information of a plurality of second cells in a first cell; and holding the system information of the plurality of second cells and applying the system information in the destination second cell.

[0012] Figure 1 is a schematic diagram of the overall configuration of a wireless communication system. Figure 2 is a diagram showing an example of carrier types in 6G. Figure 3 is a functional block diagram of a base station. Figure 4 is a functional block diagram of a terminal. Figure 5 is a diagram showing the first embodiment. Figure 6 is a diagram showing the sequence in the first embodiment. Figure 7 is a diagram showing the second embodiment. Figure 8 is a diagram showing the sequence in the second embodiment. Figure 9 is a diagram showing an example of the hardware configuration of a base station and a terminal. Figure 10 is a diagram showing an example of the configuration of a vehicle.

[0013] The embodiments will be described below with reference to the drawings. Note that identical or similar reference numerals are used to denote the same functions and components, and their descriptions will be omitted as appropriate.

[0014] (1) Overall schematic diagram 1 of the wireless communication system is an overall schematic diagram of the wireless communication system 10 according to the embodiment. The wireless communication system 10 is a wireless communication system in accordance with 6G and includes UE200, base station 100, and network 20.

[0015] The wireless communication system 10 may be a wireless communication system conforming to a method called Beyond 5G or 5G Evolution, or it may partially include a wireless communication system conforming to a method called Long Term Evolution (LTE) or 4G, or 5G New Radio (NR). Furthermore, the wireless communication system 10 may be configured to include other radio access technologies (RATs) in addition to 6G, such as 4G / LTE and 5G. The specific configuration of the wireless system 10 is not limited to the example shown in Figure 1.

[0016] Network 20 includes multiple base stations 100. Base stations 100 are, for example, gNBs, and may also include eNBs, etc. Network 20 is connected to a 6G-compliant core network (6GC, not shown).

[0017] Base station 100 is a 6G-compliant wireless base station and performs 6G-compliant wireless communication with UE200. The base station also configures a cell that provides communication services to UE200 using a carrier as described later. UE200 is a terminal capable of performing 6G-compliant wireless communication, and may also perform wireless communication according to communication methods called Beyond 5G or 5G Evolution. It may also have the capability to perform wireless communication according to LTE / 4G or NR / 5G.

[0018] The UE200 may perform measurement reporting periodically. The UE200 may also perform measurement reporting for each event.

[0019] The base station 100 and UE200 can support carrier aggregation (CA), which uses multiple component carriers (CCs) bundled together, and dual connectivity (DC), which enables simultaneous communication between the UE and multiple base stations, by controlling the radio signals transmitted from multiple antenna elements.

[0020] Furthermore, the wireless communication system 10 may support multiple frequency ranges (FRs). That is, it may support the following FRs:

[0021] FR1: 410 MHz to 7.125 GHz FR2 FR2-1: 24.25 GHz to 52.6 GHz FR2-2: above 52.6 GHz to 71 GHz In FR1, a subcarrier spacing (SCS) of 15, 30, or 60 kHz and a bandwidth (BW) of 5 to 100 MHz may be used. FR2 is at a higher frequency than FR1, and an SCS of 60 or 120 kHz (240 kHz may be included) and a BW of 50 to 400 MHz may be used.

[0022] Furthermore, the wireless communication system 10 may also support higher frequency bands than the FR2-2 frequency band. In addition, the wireless communication system 10 may support the 7.125GHz to 24.25GHz band (which may be called FR3).

[0023] Furthermore, one slot in the wireless communication system 10 may consist of 14 symbols. If this configuration is maintained, the larger (wider) the SCS, the shorter the symbol period (and slot period). Note that the SCS is not limited to the above-mentioned SCS, and may be, for example, 480 or 960 kHz.

[0024] Furthermore, the number of symbols constituting one slot does not necessarily have to be 14; for example, it could be 28 or 56 symbols. In addition, the number of slots per subframe may vary depending on the SCS.

[0025] (2) Carrier configuration diagram 2 is a diagram showing an example of carrier types in 6G. The network 20 in Figure 1 may support the carrier types shown in Figure 2. Specifically, the base station 100 may support all or some of the carrier types: anchor carrier, data carrier, and perch carrier. A cell composed of an anchor carrier is called an anchor cell, a cell composed of a data carrier is called a data cell, and a cell composed of a perch carrier is called a perch cell.

[0026] In this embodiment, "carrier," "cell," "frequency," "frequency band," and "band" may be interchangeable.

[0027] Figure 2 shows an example where the anchor carrier is located in two frequency bands (Band A and Band B), and the data carrier is located in a higher frequency band (Band C) than the anchor carrier. In addition, a new carrier called a perch carrier may be introduced in 6G. The perch carrier may be set to a lower frequency than the anchor carrier, or it may be set to a part of the same frequency band as the anchor carrier.

[0028] Anchor carriers may also be called anchor cells or anchor bands, and perch carriers may also be called perch cells or perch bands. i) If perch carriers are not introduced, perch carriers do not exist in Figure 2. Carriers other than anchor carriers may be called non-anchor carriers. Anchor carriers are carriers that can perform the role of a PCell (Primary Cell), while non-anchor carriers may include carriers that can perform the role of a PCell (Primary Cell) and carriers that perform the role of an SCell (Secondary Cell). Anchor carriers may have the role of transmitting all or part of the synchronization signal (SS), sync raster, system information (MIB, SIB1, other SIBs), and control signaling (PDCCH, DCI) of non-anchor carriers.

[0029] The synchronization signal (SS) may include, for example, a PSS (Primary Synchronization Signal) and / or an SSS (Secondary Synchronization Signal). System information may include, for example, a MIB (Master Information Block) transmitted on a broadcast channel (e.g., a PBCH (Physical Broadcast Channel)) and / or an SIB (e.g., SIB1) transmitted on a downlink shared channel (e.g., a PDSCH (Physical Downlink Shared Channel)). Since system information is broadcast on the broadcast channel and / or downlink shared channel, it may also be referred to as broadcast information. Furthermore, the block including the synchronization signal and broadcast channel may be called an SSB or SS / PBCH (synchronization signal / physical broadcast channel block), etc.

[0030] An anchor cell composed of an anchor carrier in the embodiment may be understood as the first cell, and a non-anchor cell composed of a non-anchor carrier may be understood as the second cell. ii) When a perch carrier is introduced, a perch carrier is present in Figure 2. Carriers other than the perch carrier may be called non-perch carriers. Non-perch carriers are anchor carriers and data carriers, but when the anchor carrier plays the role of a PCell and the data carrier plays the role of an SCell, the non-perch carrier may be understood to mean an anchor carrier. The perch carrier may have the role of sending all or part of the synchronization signals (SS), sync raster, system information (MIB, SIB1, other SIBs), and control signaling (PDCCH, DCI) of the non-perch carrier.

[0031] Furthermore, perch carriers may be understood as being included in the broader definition of anchor carriers. In this case, perch carriers may also be broadly referred to as anchor carriers. Anchor carriers, including perch carriers, may be responsible for transmitting all or part of the synchronization signals (SS), sync raster, system information (MIB, SIB1, other SIBs), and control signaling (PDCCH, DCI) of non-anchor carriers.

[0032] A parch cell composed of a parch carrier in the embodiment may be understood as a first cell, and a non-parch cell composed of a non-parch carrier may be understood as a second cell.

[0033] In the embodiment, at least the synchronization signal (SS) of the non-anchor carrier (or non-perch carrier) and system information (MIB, SIB1, other SIBs) may be transmitted on the non-anchor carrier (or non-perch carrier). Furthermore, all or part of the signals or broadcast information other than the synchronization signal (SS), i.e., the system information (MIB, SIB1, other SIBs), may not be transmitted on the non-anchor carrier (or non-perch carrier) from the perspective of NES. Also, in the embodiment, the signals or broadcast information of the non-anchor carrier (or non-perch carrier) that are not transmitted on the non-anchor carrier (or non-perch carrier) may be transmitted on the anchor carrier (or perch carrier).

[0034] Thus, in 5G, the synchronization signal (SS) and PBCH were treated as a single set SSB, but in this embodiment, the synchronization signal (SS) and PBCH of the non-anchor carrier (or non-perch carrier) may be treated independently and transmitted using separate carriers. This allows for a reduction in the periodic transmission of signals or information, for example, when the non-anchor carrier (or non-perch carrier) is set in a high frequency band, thus enabling the NES effect.

[0035] A perch carrier may be understood as a carrier having at least one of the following features, for example:

[0036] - It is a carrier that all devices can access.

[0037] - The carrier is accessible regardless of the terminal type or usage environment (however, some terminals that meet different conditions than the type or usage environment may be configured to be inaccessible). Terminal types include, for example, enhanced Mobile BroadBand (eMBB) terminals, Reduced Capability (RedCap) terminals, Unmanned Aerial Vehicle (UAV) terminals, XR terminals, NTN terminals, IoT terminals, Industrial IoT terminals, NarrowBand IoT (NB-IoT) terminals, Low-Power Wake-Up Signal (LPWUS) terminals, and Small Data Transmission (SDT) terminals. Terminal usage environments include, for example, access type (e.g., 3GPP, non-3GPP), use case (e.g., Immersive Communication, Ubiquitous Connectivity), and service type (e.g., Ultra-Reliable and Low Latency Communications (URLLC), Vehicle to X (V2X), Multicast and Broadcast Service (MBS), Broadcast Service).

[0038] This refers to a carrier that is accessible regardless of whether data communication is enabled or disabled (a carrier not intended for data communication). Data communication primarily refers to the transmission and reception of user data and traffic data processed by the U-Plane (User-Plane). User data may include voice calls, but does not exclude control data. Hereafter, this will also be simply referred to as "communication."

[0039] - This is the carrier on which synchronization signals (SS) and / or system information are transmitted. Synchronization signals may include, for example, PSS and / or SSS. System information may include, for example, MIB transmitted on a broadcast channel (e.g., PBCH) and / or SIB (e.g., SIB1) transmitted on a downlink shared channel (e.g., PDSCH). Since system information is broadcast on the broadcast channel and / or downlink shared channel, it may also be called broadcast information. The block containing the synchronization signals and broadcast channel may also be called SSB or SS / PBCH, etc. Thus, the perch carrier can also be described as the carrier on which control information (e.g., signals and / or information for initial access) is transmitted. The system information transmitted and received on the perch carrier may include information about other carriers (data carrier (Band C), anchor carrier (Bands A and B) in the figure). Information about other carriers is, for example, information for a terminal accessing the perch carrier to select another carrier (to perform initial access to another carrier). Furthermore, if other carriers transition to Network Energy Saving mode (NES mode), information regarding those carriers may also include information regarding NES mode. Examples of NES mode information include Cell DTX config (periodicity), Cell DRX config (periodicity), and SSB periodicity.

[0040] The perch carrier may be in a lower frequency band than the data carrier (Band C) that transmits and receives data, or the anchor carrier (Bands A and B) that transmits and receives control information (and data). Due to frequency characteristics, coverage is greater in the lower frequency band, so coverage can be ensured by using a carrier in a lower frequency band than the anchor carrier as the perch carrier. On the other hand, by using a carrier in a higher frequency band than the perch carrier as the anchor carrier, a wider bandwidth can be ensured, thereby improving throughput. In this way, by combining a perch carrier and an anchor carrier, coverage can be ensured and throughput can be improved.

[0041] One use case for perch carriers and anchor carriers is to use a wideband frequency band with higher frequencies as an anchor carrier to support high-speed, high-capacity communication services such as XR (Cross Reality or Extended Reality) terminals. However, because such high frequencies are directional, they are susceptible to reflection, requiring beam sweeping or the application of multiple beams, which increases network power consumption. Therefore, when providing high-speed, high-capacity communication services to terminals, a high-frequency band can be provided (turned on) as the anchor carrier. However, when not providing high-speed, high-capacity communication services to terminals, the high-frequency band can not be provided as the anchor carrier (turned off), and the terminals can be kept on standby with a perch carrier in a lower frequency band. By setting the perch carrier to a lower frequency band, coverage can be easily ensured compared to high frequencies because lower frequencies have the property of bending around obstacles, and network power consumption can also be reduced. Thus, perch carriers and anchor carriers are also suitable for the introduction of NES.

[0042] Note that "waiting via a prach carrier (camp on)" may be used in the same sense as waiting in a prach cell or waiting in a prach band. "Waiting" may be used to mean waiting for a communication service. Also, "waiting" may be used to mean "camp on". The state of the UE performing the waiting may be understood to be a state in which an RRC connection is not established or suspended, such as an idle state (e.g., RRC_Idle state) or an inactive state (e.g., RRC_Inactive state).

[0043] The prach carrier may be recognizable by the terminal by default, or may be set by the network (base station). For example, the prach carrier may be assigned to a frequency band where it is relatively easy to secure coverage. The prach carrier may be understood to be a prach carrier group composed of a plurality of prach carriers.

[0044] The anchor carrier may be a carrier for transmitting and receiving control information (and data), and may be assigned to Band A or Band B, for example, in a frequency band higher than the prach carrier (e.g., 2 GHz band, etc.). In contrast, the data carrier may be a carrier for transmitting and receiving data, and may be assigned to Band C, which is in a frequency band even higher than the anchor carrier (e.g., 3.7 GHz band, 4.5 GHz band, 28 GHz band, etc.). These carriers may be used appropriately depending on the type of terminal and the use case. For example, when an XR terminal or UE uses an XR service, it is conceivable to transition from the prach carrier to the anchor carrier in Band A or B with a high frequency, or the data carrier in Band C, and perform RACH to enter the connected state (e.g., RRC_Connected state).

[0045] Note that "waiting via an anchor carrier" may be used in the same sense as waiting in an anchor cell or waiting in an anchor band.

[0046] Hereinafter, the cases of anchor cells and non-anchor cells will be described.

[0047] However, the same applies to the cases of partial cells and non-partial cells. In the cases of partial cells and non-partial cells, the anchor cells may be understood as replaced with partial cells, and the non-anchor cells may be understood as replaced with non-partial cells. Note that the non-partial cells may include anchor cells and data cells, but if the data cells are not used as PCells, the non-partial cells may be understood as anchor cells.

[0048] (3) Functional Block Configuration of Wireless Communication System

[0049] (3.1) Functional Block Configuration of Base Station As shown in FIG. 3, the base station 100 includes a wireless communication unit 110, an information notification information providing unit 120, and a control unit 130.

[0050] The wireless communication unit 110 transmits and receives wireless signals to and from the UE 200. The wireless signals include channels and reference signals.

[0051] The wireless communication unit 110 transmits and receives wireless signals via a control channel or a data channel. The control channels include a Physical Uplink Control Channel (PUCCH), a Physical Downlink Control Channel (PDCCH), a Physical Random Access Channel (PRACH), a Physical Broadcast Channel (PBCH), etc. Also, the data channels include a Physical Uplink Shared Channel (PUSCH), a Physical Downlink Shared Channel (PDSCH), etc. Data may mean data transmitted via a data channel. Also, the reference signals include a Demodulation Reference Signal (DMRS), a Phase Tracking Reference Signal (PTRS), a Channel State Information-Reference Signal (CSI-RS), a Sounding Reference Signal (SRS), a Positioning Reference Signal (PRS).

[0052] The wireless communication unit 110 can transmit one or more notification information. The notification information may be a master information block (MIB) or a system information block (SIB).

[0053] The wireless communication unit 110 transmits the anchor cell's synchronization signal (SS), PBCH (MIB), and SIB in the anchor cell. In this embodiment, the wireless communication unit 110 may also transmit all or part of the non-anchor cell broadcast information, specifically the PBCH (MIB, DMRS), SIB1, and other SIBs, in the anchor cell's PBCH (MIB) and SIB.

[0054] In addition, in the embodiment, the wireless communication unit 110 may transmit a synchronization signal (SS) for non-anchor cells, and may not transmit all or part of the broadcast information for non-anchor cells, specifically PBCH (MIB, DMRS), SIB1, and other SIBs. In addition, in the embodiment, the wireless communication unit 110 may transmit broadcast information including affiliation information and validity information, as described later, for non-anchor cells.

[0055] The wireless communication unit 110 can send RRC messages to the UE200. The wireless communication unit 110 also sends paging messages to the UE200. The wireless communication unit 110 receives an initial access request from the UE200 and sends a response with the necessary initial access procedure to the UE200. The initial access may be a random access procedure.

[0056] In this embodiment, the wireless communication unit 110 may be configured as a transmitting unit that transmits system information of the second cell to which affiliation information has been added in the first cell. The affiliation information may be understood as information indicating the correspondence between anchor cells and non-anchor cells, as described later. Specifically, it may be a predetermined ID, group ID, cell ID list, or AreaScope ID, as described later.

[0057] The wireless communication unit 110 can receive information transmitted by the wireless communication unit 210, which will be described later. Furthermore, the wireless communication unit 110 can transmit information received by the wireless communication unit 210, which will also be described later.

[0058] The notification information provision unit 120 generates notification information to be transmitted by the anchor cell or by a non-anchor cell and provides it to the UE200.

[0059] i) In an embodiment of broadcast information transmitted by an anchor cell, the broadcast information provider 120 may include in the anchor cell's broadcast information that should be transmitted by multiple non-anchor cells. Specifically, the PBCH (MIB) and SIB of the anchor cell may include and transmit list information of multiple non-anchor cells, for example, all or part of the information of each non-anchor cell's PBCH (MIB, DMRS), SIB1, and other SIBs. All or part of this list information of non-anchor cells may be understood as information necessary to access the non-anchor cells.

[0060] Specifically, the notification information provision unit 120 may provide the UE200 with the system information of the non-anchor cells listed below, including it in the PBCH (MIB) and SIB of the anchor cell.

[0061] In the following, Option 1 is an example of information elements for non-anchor cell system information separated by PCI (Physical Cell ID), and Option 2 is an example of information elements for non-anchor cell system information separated by beam index.

[0062] オプション1)Anchor cell MIB / SIB PBCH(MIB, DMRS) for PCI=1 systemFrameNumber subCarrierSpacingCommon dmrs-TypeA-Position pdcch-ConfigSIB1 cellBarred intraFreqReselection PBCH(MIB, DMRS) for PCI=2 systemFrameNumber subCarrierSpacingCommon dmrs-TypeA-Position pdcch-ConfigSIB1 cellBarred intraFreqReselection PBCH(MIB, DMRS) for PCI=3 systemFrameNumber subCarrierSpacingCommon dmrs-TypeA-Position pdcch-ConfigSIB1 cellBarred intraFreqReselection オプション2)Anchor cell MIB / SIB PBCH(MIB, DMRS) for beam index=1 systemFrameNumber subCarrierSpacingCommon dmrs-TypeA-Position pdcch-ConfigSIB1 cellBarred intraFreqReselection PBCH(MIB,DMRS) for beam index=2 systemFrameNumber subCarrierSpacingCommon dmrs-TypeA-Position pdcch-ConfigSIB1 cellBarred intraFreqReselection PBCH(MIB, DMRS) for beam index=3 systemFrameNumber subCarrierSpacingCommon dmrs-TypeA-Position pdcch-ConfigSIB1 cellBarred intraFreqReselection In the embodiment, membership information indicating that a non-anchor cell corresponds to an anchor cell may be added to the list information of non-anchor cells. For example, the membership information may be a predetermined ID common to an anchor cell and multiple non-anchor cells, or it may be a group ID that identifies a group in which an anchor cell and multiple non-anchor cells constitute the same group. Furthermore, the membership information may be a list of cell IDs consisting of the cell ID of the anchor cell and the cell IDs of multiple non-anchor cells, or it may be an AreaScope ID that associates the cell ID of the anchor cell with the cell IDs of multiple non-anchor cells.

[0063] In this embodiment, multiple non-anchor cells belonging to the coverage area of ​​an anchor cell may be given the same affiliation information as the anchor cell. When an anchor cell transmits notification information for a non-anchor cell, the anchor cell and the non-anchor cell may be given the same affiliation information.

[0064] Furthermore, in this embodiment, validity information indicating the validity of the information may be added to the list information of non-anchor cells. The validity information may be a value tag or a validity ID. The value tag or validity ID may be added to the entire list information of non-anchor cells, or it may be added individually to the notification information of each non-anchor cell that constitutes the list information of non-anchor cells. By using the validity information, the notification information providing unit 120 can indicate to the UE 200 whether the notification information of non-anchor cells is valid or invalid, and can also update it. For example, if the validity ID added to the list information of a non-anchor cell matches the validity ID included in the notification information of the anchor cell received by the non-anchor cell, it may be determined to be valid; otherwise, it may be determined to be invalid (or expired).

[0065] ii) Information transmitted by non-anchor cells: From the perspective of NES, the information provider unit 120 does not need to include all or part of the system information of the non-anchor cell (or non-parch cell) in the information transmitted by each non-anchor cell. Specifically, it does not transmit all or part of the information of the non-anchor cell's PBCH (MIB, DMRS), SIB1, and other SIBs.

[0066] In this embodiment, the notification information providing unit 120 may include the aforementioned affiliation information and validity information in the notification information transmitted in non-anchor cells. For example, a new simplified MIB / SIB consisting of only a few bits, such as affiliation information and validity information, may be defined. This reduces the amount of notification information transmitted in non-anchor cells.

[0067] In addition, the notification information provision unit 120 in this embodiment may be configured as a control unit that adds the affiliation information to which the second cell belongs, which is transmitted in the second cell, to the system information of the second cell.

[0068] The control unit 130 controls each functional block that constitutes the base station 100. For example, the control unit 130 controls the transmission and reception of wireless signals by the wireless communication unit 110, and the provision of anchor cell and non-anchor cell notification information by the notification information provision unit 120.

[0069] In this embodiment, the control unit 130 may instruct the UE200 to update the non-anchor cell notification information (system information) via a PDCCH transmitted by the anchor cell or a PDCCH transmitted by the non-anchor cell.

[0070] The control unit 130 receives an initial access request from the UE200 and executes the initial access procedure. The control unit 130 performs scheduling for the UE200. The control unit 130 also performs processing related to control signals, such as radio resource control (RRC) signaling.

[0071] (3.2) As shown in the terminal's functional block configuration diagram 4, the UE200 comprises a wireless communication unit 210, a notification information acquisition and storage unit 220, and a control unit 230.

[0072] The wireless communication unit 210 transmits and receives wireless signals to and from the base station 100.

[0073] The wireless communication unit 210 can receive one or more broadcast information from the base station 100. The broadcast information may be MIB / SIB.

[0074] In this embodiment, the broadcast information received by the anchor cell may include broadcast information from a non-anchor cell, as well as affiliation information and validity information as described above. The broadcast information may also include an information element indicating the resource for the initial access that the UE200 makes with the base station 100. The resource for the initial access may mean a RACH resource.

[0075] In this embodiment, the wireless communication unit 210 may be configured as a receiving unit in the first cell to receive system information from a plurality of second cells. In addition, in this embodiment, the wireless communication unit 210 may be configured as a receiving unit in the second cell to receive membership information to which the second cell belongs.

[0076] The wireless communication unit 210 can receive RRC messages, paging messages, and downlink control information for scheduling from the base station 100.

[0077] Furthermore, the wireless communication unit 210 can receive information transmitted by the wireless communication unit 110. Also, the wireless communication unit 210 can transmit information received by the wireless communication unit 110.

[0078] The notification information acquisition and storage unit 220 acquires and stores notification information, affiliation information, and validity information of multiple non-anchor cells received in the anchor cell. Note that "store" may be rephrased as "retain" or "maintain."

[0079] In this embodiment, the UE200 can receive list information containing notification information from multiple non-anchor cells in an anchor cell, acquire all of it, and store it.

[0080] The notification information acquisition and storage unit 220 may retain the list information of multiple non-anchor cells it has stored until new list information is acquired, or it may delete or update it based on validity information.

[0081] For example, if the affiliation information of the destination non-anchor cell changes from that of the non-anchor cell before the move, the cell will no longer belong to the anchor cell it previously belonged to. In this case, the new anchor cell is accessed to obtain the new list information for the non-anchor cell. A change in the affiliation information of the destination non-anchor cell from that of the non-anchor cell before the move can be understood as the cell now being outside the coverage area (a predetermined area) of the previous anchor cell.

[0082] A predetermined area may be associated with an AreaScope ID, and may consist of a cell or cell ID, a beam or beam ID, a tracking area, a TRP ID, and physical location information.

[0083] Furthermore, even if the affiliation information of the non-anchor cell at the destination remains unchanged from that of the non-anchor cell before the move, if it becomes invalid based on the validity information (which may be due to information updates, a certain period of time, etc.), the anchor cell may be accessed again to receive and reacquire the notification information of the non-anchor cell.

[0084] The notification information acquisition and storage unit 220 in this embodiment may be configured as a control unit that holds system information for a plurality of second cells and applies the system information to the second cell at the destination.

[0085] The control unit 230 controls each functional block that makes up the UE200. For example, the control unit 230 controls the transmission and reception of wireless signals by the wireless communication unit 210, and the acquisition and storage of notification information by the notification information acquisition and storage unit 220.

[0086] The control unit 230 in the embodiment may be configured to apply the stored system information as valid in a predetermined area or time. Alternatively, the control unit 230 in the embodiment may be configured to determine whether to apply the stored system information in the second cell based on the affiliation information.

[0087] In this embodiment, if the control unit 230 finds that the affiliation information of the non-anchor cell to which the UE200 is located matches the affiliation information of the non-anchor cell already stored in the notification information acquisition and storage unit 220, it uses the notification information of the non-anchor cell that has already been acquired and stored. Furthermore, if the affiliation information of the non-anchor cell where the UE200 is located does not match (i.e., it has moved outside a predetermined area), or if the stored notification information of the non-anchor cell has expired, the control unit 230 accesses the anchor cell and reacquires the notification information of the non-anchor cell.

[0088] According to the embodiment, the UE200 detects an anchor cell based on the anchor cell's synchronization signal (SS) and acquires broadcast information (including broadcast information from multiple non-anchor cells) transmitted by the anchor cell. When it detects a non-anchor cell's synchronization signal (SS), it accesses the non-anchor cell based on the broadcast information (MIB, SIB1) of the non-anchor cell already acquired by the anchor cell and can utilize the system information (SIB2 and subsequent SIB information) already acquired by the anchor cell. Furthermore, even if the UE200 needs to move to a new non-anchor cell within a predetermined area, it can access the destination non-anchor cell based on the broadcast information (MIB, SIB1) of the destination non-anchor cell already acquired by the anchor cell and can utilize the system information (SIB2 and subsequent SIB information) already acquired by the anchor cell.

[0089] In this way, the UE200 acquires, stores, and retains broadcast information from multiple non-anchor cells that can be received in the anchor cell. This eliminates the need to re-access the anchor cell to acquire broadcast information from the destination non-anchor cell each time it moves between non-anchor cells, thus enabling rapid movement.

[0090] (4) Operation of the wireless communication system In 6G, from the perspective of NES, a concept is introduced to distinguish between cells that are responsible for transmitting broadcast information (MIB, SIB) essential for accessing the network and cells that are responsible for other data communications, and it is conceivable that the transmission of all or part of the broadcast information may be omitted or reduced in the latter cells.

[0091] In such cases, terminals cannot obtain the necessary information in cells where all or part of the notification information is omitted or reduced, so the challenge becomes how to enable rapid movement between such cells.

[0092] The technical challenges that this disclosure seeks to address are not limited to those mentioned above, and other technical challenges not mentioned herein will be clearly understood by a person with ordinary skill in the art to which this disclosure pertains, based on the description herein.

[0093] (4.1) Example of Operation The UE200 acquires and stores broadcast information from multiple non-anchor cells received in the anchor cell. When the UE200 moves to a non-anchor cell, it accesses the non-anchor cell based on the broadcast information (MIB, SIB1) of the destination non-anchor cell that has already been acquired and stored, and uses the broadcast information (SIB2 and subsequent SIB information) of the non-anchor cell that has already been acquired and stored.

[0094] Furthermore, accessing a non-anchor cell based on already acquired and stored non-anchor cell broadcast information (MIB, SIB1), and using the already acquired and stored non-anchor cell broadcast information (SIB2 and later SIB information) in the non-anchor cell is also referred to as applying the non-anchor cell broadcast information.

[0095] (4.2.1) Operation Example 1 Figure 5 shows the first embodiment. Operation Example 1 is movement between non-anchor cells within the area of ​​the same anchor cell, and Figure 5 shows an example in which two non-anchor cells 1 and 2 are included within the coverage area of ​​the anchor cell.

[0096] Figure 5 shows the affiliation information indicating that non-anchor cells 1 and 2 correspond to the anchor cell; in this example, AreaScope ID=1 is assigned.

[0097] Figure 6 shows the sequence in the first embodiment. In the following description, the validity information (validity ID) will be assumed to be valid.

[0098] The UE200 detects the synchronization signal (SS) of the anchor cell and receives the anchor cell's broadcast information. The anchor cell's broadcast information includes the broadcast information of non-anchor cells 1 and 2, their affiliation information (AreaScope=1), and validity information (validity ID). At this point, the UE200 acquires and stores the broadcast information, affiliation information (AreaScope=1), and validity information (validity ID) of multiple non-anchor cells 1 and 2.

[0099] Since UE200 is within the coverage area of ​​non-anchor cell 1, when it detects the synchronization signal (SS) from non-anchor cell 1, it determines whether the belonging information (AreaScope=1) and validity information (validity ID) contained in the broadcast information received by non-anchor cell 1 match the broadcast information (AreaScope=1) and validity information (validity ID) already acquired and stored. In this example, they match, so UE200 accesses non-anchor cell 1 based on the MIB / SIB1 of non-anchor cell 1 that has already been acquired and stored, and uses the SIB information from SIB2 onwards that has already been acquired and stored in non-anchor cell 1.

[0100] Subsequently, as the UE200 moves from non-anchor cell 1 to non-anchor cell 2, the quality of non-anchor cell 1 gradually deteriorates, and the UE200 detects a new synchronization signal (SS) for non-anchor cell 2 as the destination cell. The UE200 determines whether the belonging information (AreaScope=1) and validity information (validity ID) contained in the broadcast information received at non-anchor cell 2 match the belonging information (AreaScope=1) and validity information (validity ID) of the broadcast information already acquired and stored. In this example, they match, so the UE200 accesses non-anchor cell 2 based on the MIB / SIB1 of non-anchor cell 2 that has already been acquired and stored, and reuses the SIB information from SIB2 onwards that was applied at non-anchor cell 1 at non-anchor cell 2.

[0101] Thus, in the first embodiment, the UE200 acquires and stores all of the broadcast information, affiliation information (AreaScope=1), and validity information (validity ID) received by multiple non-anchor cells 1 and 2 in the anchor cell. This eliminates the need for the UE200 to fall back to the anchor cell to acquire the broadcast information of the destination non-anchor cell 2 when moving from non-anchor cell 1 to non-anchor cell 2. As a result, rapid movement can be achieved.

[0102] Note that the above example assumes that the validity ID matches. However, if they do not match, the information has expired, and the UE200 needs to fall back to the anchor cell and reacquire new non-anchor cell notification information.

[0103] (4.2.2) Operation Example 2 Figure 7 shows a second embodiment. Operation Example 2 is movement between non-anchor cells in different anchor cell areas. Figure 7 shows an example where two non-anchor cells A1 and A2 are included within the coverage area of ​​anchor cell A, and two non-anchor cells B1 and B2 are also included within the coverage area of ​​anchor cell B.

[0104] In Figure 7, non-anchor cells A1 and A2 are assigned affiliation information indicating that they correspond to anchor cell A; in this example, AreaScope ID=1 is assigned. Similarly, non-anchor cells B1 and B2 are assigned affiliation information indicating that they correspond to anchor cell B; in this example, AreaScope ID=2 is assigned.

[0105] Figure 8 shows the sequence in the second embodiment. In the following description, the validity information (validity ID) will be assumed to be valid.

[0106] The UE200 detects the synchronization signal (SS) of anchor cell A and receives anchor cell broadcast information at anchor cell A. The anchor cell broadcast information includes broadcast information, affiliation information (AreaScope=1), and validity information (validity ID) of non-anchor cells A1 and A2. At this point, the UE200 acquires and stores the broadcast information, affiliation information (AreaScope=1), and validity information (validity ID) of multiple non-anchor cells A1 and A2.

[0107] In this example, since UE200 is within the coverage area of ​​non-anchor cell A2, when it detects the synchronization signal (SS) from non-anchor cell A2, it determines whether the belonging information (AreaScope=1) and validity information (validity ID) contained in the broadcast information received by non-anchor cell A2 match the belonging information (AreaScope=1) and validity information (validity ID) of the broadcast information that has already been acquired and stored. In this example, they match, so UE200 accesses non-anchor cell A2 based on the MIB / SIB1 of non-anchor cell A2 that has already been acquired and stored, and applies the SIB information from SIB2 onwards that has already been acquired and stored to non-anchor cell A2.

[0108] Subsequently, as the UE200 moves from non-anchor cell A2 towards non-anchor cell B1, the quality of non-anchor cell A2 gradually deteriorates, and it detects the synchronization signal (SS) of non-anchor cell B1 as the new destination cell. The UE200 determines whether the affiliation information (AreaScope=2) and validity information (validity ID) contained in the broadcast information received at non-anchor cell B1 match the affiliation information (AreaScope=1) and validity information (validity ID) of the broadcast information already acquired and stored. In this example, the affiliation information does not match, so the UE200 determines that it has moved to a non-anchor cell outside the designated area and understands that the information acquired and stored at anchor cell A cannot be applied.

[0109] Next, UE200 attempts to access anchor cell B to obtain broadcast information for non-anchor cell B1. UE200 detects the synchronization signal (SS) of anchor cell B and receives broadcast information for anchor cell B. The broadcast information for anchor cell B includes broadcast information for non-anchor cells B1 and B2, affiliation information (AreaScope=2), and validity information (validity ID). At this point, UE200 obtains and updates its memory with all the broadcast information, affiliation information (AreaScope=2), and validity information (validity ID) for multiple non-anchor cells B1 and B2.

[0110] Subsequently, UE200 accesses non-anchor cell B1 based on the newly acquired and updated MIB / SIB1 of non-anchor cell B1, and applies the newly acquired and updated SIB information from SIB2 onwards to non-anchor cell B1.

[0111] Thus, in the second embodiment, the UE200 can recognize, using its belonging information (AreaScope ID), whether the destination non-anchor cell corresponds to the same anchor cell as a non-anchor cell that has already been acquired and stored. This allows the UE200 to determine whether it is necessary to fall back to an anchor cell when moving between non-anchor cells.

[0112] (5) Effects and Effects As described above, according to the embodiment, the UE200 acquires and stores all of the broadcast information from multiple non-anchor cells that it receives in the anchor cell. This eliminates the need for the UE200 to fall back to the anchor cell in order to acquire the broadcast information of the other non-anchor cell when it moves from one non-anchor cell to another. As a result, rapid movement can be achieved.

[0113] Furthermore, the UE200 receives belonging information (AreaScope ID) indicating the correspondence between anchor cells and non-anchor cells at both the anchor cell and the non-anchor cell. This allows it to determine whether it can use the broadcast information it has already acquired and stored when moving to another non-anchor cell. As a result, the UE200 can determine whether it needs to fall back to an anchor cell when moving between non-anchor cells.

[0114] (6) Other Embodiments Although the contents of the present invention have been described above in accordance with the embodiments, it will be obvious to those skilled in the art that the present invention is not limited to these descriptions and that various modifications and improvements are possible.

[0115] In the above description, it was explained that the UE200 acquires and stores broadcast information from multiple non-anchor cells received by the anchor cell. However, it may store broadcast information for all non-anchor cells listed in the non-anchor cell list information, or it may select which multiple non-anchor cell broadcast information to store depending on the signal strength of the non-anchor cells (e.g., RSRP: Reference Signal Received Power, RSRQ: Reference Signal Received Quality, SINR: Signal to Interference plus Noise Ratio).

[0116] In this disclosure, multiple options and variations may be combined as a single option / variation.

[0117] The block diagrams used in the description of the above embodiments show functional units. These functional blocks (components) are realized by any combination of at least one of hardware and software. Furthermore, the method of realizing each functional block is not particularly limited. That is, each functional block may be realized using one device that is physically or logically coupled, or it may be realized using two or more physically or logically separated devices that are directly or indirectly connected (for example, using wired or wireless connections). A functional block may also be realized by combining software with the one or more of the above devices.

[0118] Functions include, but are not limited to, judgment, decision, judgment, calculation, calculation, processing, derivation, investigation, exploration, confirmation, reception, transmission, output, access, resolution, selection, selection, establishment, comparison, assumption, expectation, assumption, broadcasting, notifying, communicating, forwarding, configuring, reconfiguring, allocating (mapping), and assigning. For example, a functional block (configuration part) that enables transmission is called a transmitting unit or transmitter. In all cases, as mentioned above, the method of implementation is not particularly limited.

[0119] For example, the base station 100 and terminal 200 in one embodiment of the present disclosure may function as computers that process the wireless communication method of the present disclosure. Figure 9 is a diagram showing an example of the hardware configuration of the base station 100 and terminal 200 according to one embodiment of the present disclosure. The above-mentioned base station 100 and terminal 200 may be physically configured as computer devices including a processor 1001, memory 1002, storage 1003, communication device 1004, input device 1005, output device 1006, bus 1007, etc.

[0120] In the following explanation, the term "device" can be replaced with "circuit," "device," "unit," etc. The hardware configuration of the base station 100 and terminal 200 may include one or more of the devices shown in the figure, or it may be configured to omit some of the devices.

[0121] Each function in the base station 100 and terminal 200 is realized by loading predetermined software (programs) onto hardware such as the processor 1001 and memory 1002, which allows the processor 1001 to perform calculations, control communication by the communication device 1004, and control at least one of the reading and writing of data in the memory 1002 and storage 1003.

[0122] The processor 1001 controls the entire computer, for example, by running an operating system. The processor 1001 may consist of a central processing unit (CPU) that includes interfaces with peripheral devices, control units, arithmetic units, registers, and so on.

[0123] Furthermore, the processor 1001 reads programs (program code), software modules, data, etc., from at least one of the storage 1003 and the communication device 1004 into the memory 1002 and executes various processes accordingly. The program used is one that causes the computer to execute at least a part of the operations described in the above embodiment. Furthermore, although it has been explained that the above processes are executed by one processor 1001, they may be executed simultaneously or sequentially by two or more processors 1001. The processor 1001 may be implemented by one or more chips. The program may also be transmitted from a network via a telecommunications line. The memory 1002 is a computer-readable recording medium and may consist of at least one of the following: Read Only Memory (ROM), Erasable Programmable ROM (EPROM), Electrically Erasable Programmable ROM (EEPROM), Random Access Memory (RAM), etc. The memory 1002 may also be called a register, cache, main memory, etc. The memory 1002 can store executable programs (program code), software modules, etc., for implementing a wireless communication method according to one embodiment of the present disclosure.

[0124] The storage 1003 is a computer-readable recording medium and may consist of at least one of the following: an optical disc such as a Compact Disc ROM (CD-ROM), a hard disk drive, a flexible disk, a magneto-optical disk (e.g., Compact Disc, Digital Multipurpose Disc, Blu-ray® Disc), a smart card, flash memory (e.g., a card, stick, key drive), a floppy® disk, a magnetic strip, etc. The storage 1003 may also be called an auxiliary storage device. The above-mentioned storage medium may be, for example, a database, server, or other suitable medium including at least one of memory 1002 and storage 1003.

[0125] The communication device 1004 is hardware (transceiver / receiver device) for communicating between computers via at least one of a wired network and a wireless network, and is also referred to as a network device, network controller, network card, communication module, etc. The communication device 1004 may be configured to include, for example, a high-frequency switch, duplexer, filter, frequency synthesizer, etc., in order to implement at least one of frequency division duplex (FDD) and time division duplex (TDD).

[0126] The input device 1005 is an input device that accepts input from an external source (e.g., a keyboard, mouse, microphone, switch, button, sensor, etc.). The output device 1006 is an output device that outputs to an external source (e.g., a display, speaker, LED lamp, etc.). The input device 1005 and the output device 1006 may be configured as an integrated unit (e.g., a touch panel).

[0127] Furthermore, each device, such as the processor 1001 and memory 1002, is connected by a bus 1007 for communicating information. The bus 1007 may be configured using a single bus, or different buses may be configured for each device.

[0128] Furthermore, the base station 100 and terminal 200 may be configured to include hardware such as a microprocessor, a digital signal processor (DSP), an application-specific integrated circuit (ASIC), a programmable logic device (PLD), and a field programmable gate array (FPGA), and some or all of each functional block may be realized by such hardware. For example, the processor 1001 may be implemented using at least one of these hardware components.

[0129] Information notification is not limited to the embodiments described herein and may be carried out by other means. For example, information notification may be carried out by physical layer signaling (e.g., Downlink Control Information (DCI), Uplink Control Information (UCI)), upper layer signaling (e.g., Radio Resource Control (RRC) signaling, Medium Access Control (MAC) signaling), broadcast information (Master Information Block (MIB), System Information Block (SIB)), other signals, or combinations thereof. RRC signaling may also be called RRC messages, and may be, for example, RRC Connection Setup messages, RRC Connection Reconfiguration messages, etc.

[0130] Each aspect / embodiment described herein may apply to systems utilizing Long Term Evolution (LTE), LTE-Advanced (LTE-A), SUPER 3G, IMT-Advanced, 4th generation mobile communication system (4G), 5th generation mobile communication system (5G), 6th generation mobile communication system (6G), xth generation mobile communication system (xG) (where x is, for example, an integer or decimal), Future Radio Access (FRA), New Radio (NR), New radio access (NX), Future generation radio access (FX), W-CDMA®, GSM®, CDMA2000, Ultra Mobile Broadband (UMB), IEEE 802.11 (Wi-Fi®), IEEE 802.16 (WiMAX®), IEEE 802.20, Ultra-WideBand (UWB), Bluetooth®, and other appropriate systems, as well as at least one of the next-generation systems that are extended, modified, created, or defined based thereon. Furthermore, multiple systems may be applied in combination (for example, a combination of at least one of LTE and LTE-A with 5G).

[0131] The processing procedures, sequences, flowcharts, etc., of each aspect / embodiment described in this disclosure may be reordered, provided they do not contradict each other. For example, the methods described in this disclosure present various step elements using exemplary order and are not limited to the specific order presented.

[0132] The specific operations described in this disclosure as being performed by a base station may, in some cases, be performed by its upper node. In a network consisting of one or more network nodes having a base station, it is clear that various operations performed for communication with a terminal can be performed by the base station and at least one other network node (for example, an MME or S-GW, but not limited to these). Although the above example illustrates the case where there is one other network node besides the base station, it may also be a combination of multiple other network nodes (for example, an MME and an S-GW).

[0133] Information and signals (such as data) can be output from a higher layer (or lower layer) to a lower layer (or higher layer). Input and output may occur via multiple network nodes.

[0134] Input and output information may be stored in a specific location (e.g., memory) or managed using a management table. Input and output information may be overwritten, updated, or appended to. Output information may be deleted. Input information may be transmitted to other devices.

[0135] The determination may be made by a value represented by one bit (0 or 1), by a boolean value (true or false), or by a numerical comparison (for example, a comparison with a predetermined value).

[0136] Each aspect / embodiment described in this disclosure may be used individually, in combination, or switched between as needed during implementation. Furthermore, notification of specific information (e.g., notification that "X is") is not limited to explicit notification, but may also be implicit (e.g., by not providing such notification).

[0137] Software should be broadly interpreted to mean instructions, instruction sets, code, code segments, program code, programs, subprograms, software modules, applications, software applications, software packages, routines, subroutines, objects, executable files, execution threads, procedures, functions, and so on, whether they are called software, firmware, middleware, microcode, hardware description languages, or by any other name.

[0138] Furthermore, software, instructions, information, etc., may be transmitted and received via a transmission medium. For example, if software is transmitted from a website, server, or other remote source using at least one of wired technology (such as coaxial cable, fiber optic cable, twisted pair, or digital subscriber line (DSL)) and wireless technology (such as infrared or microwave), then at least one of these wired and wireless technologies is included in the definition of a transmission medium.

[0139] The information, signals, etc. described in this disclosure may be represented using any of the various different technologies. For example, the data, instructions, commands, information, signals, bits, symbols, chips, etc. that may be referred to throughout the above description may be represented by voltage, current, electromagnetic waves, magnetic fields or magnetic particles, optical fields or photons, or any combination thereof.

[0140] In addition, terms used in this disclosure and terms necessary for understanding this disclosure may be replaced with terms having the same or similar meanings. For example, at least one of the channel and symbol may be a signal (signaling). Also, a signal may be a message. Furthermore, a component carrier (CC) may be called a carrier frequency, cell, frequency carrier, etc.

[0141] The terms “system” and “network” as used in this disclosure are interchangeable.

[0142] Furthermore, the information, parameters, etc., described in this disclosure may be expressed using absolute values, relative values ​​from a given value, or other corresponding information. For example, wireless resources may be indicated by an index.

[0143] The names used for the parameters described above are not restrictive in any way. Furthermore, the formulas and other expressions using these parameters may differ from those expressly disclosed in this disclosure. Various channels (e.g., PUCCH, PDCCH, etc.) and information elements can be identified by any suitable name, and therefore, the various names assigned to these various channels and information elements are not restrictive in any way.

[0144] In this disclosure, terms such as "Base Station (BS)", "wireless base station", "fixed station", "NodeB", "eNodeB (eNB)", "gNodeB (gNB)", "access point", "transmission point", "reception point", "transmission / reception point", "cell", "sector", "cell group", "carrier", and "component carrier" may be used interchangeably. Base stations may also be referred to by terms such as macrocell, small cell, femtocell, and picocell.

[0145] A base station can house one or more (e.g., three) cells (also called sectors). If a base station houses multiple cells, the entire coverage area of ​​the base station can be divided into multiple smaller areas, each of which may be provided with communication services by a base station subsystem (e.g., a Remote Radio Head, RRH). The terms "cell" or "sector" refer to part or all of the coverage area of ​​at least one of the base station and / or base station subsystems providing communication services in that coverage.

[0146] In this disclosure, the transmission of information by a base station to a terminal may be interpreted as the base station instructing the terminal to perform control or operation based on the information.

[0147] In this disclosure, terms such as “terminal,” “user terminal,” “Mobile Station (MS),” and “User Equipment (UE)” may be used interchangeably.

[0148] A mobile station may also be referred to by those skilled in the art as a subscriber station, mobile unit, subscriber unit, wireless unit, remote unit, mobile device, wireless device, wireless communication device, remote device, mobile subscriber station, access terminal, mobile terminal, wireless terminal, remote terminal, handset, user agent, mobile client, client, or several other appropriate terms.

[0149] At least one of the base station and the mobile station may be called a transmitting device, a receiving device, a communication device, etc. At least one of the base station and the mobile station may also be a device mounted on a mobile body, the mobile body itself, etc. The mobile body refers to a movable object, and its speed of movement is arbitrary. This also includes the case when the mobile body is stationary. The mobile body includes, but is not limited to, vehicles, transport vehicles, automobiles, motorcycles, bicycles, connected cars, excavators, bulldozers, wheel loaders, dump trucks, forklifts, trains, buses, handcarts, rickshaws, ships and other watercraft, airplanes, rockets, satellites, drones (registered trademark), multicopters, quadcopters, balloons, and items mounted on them. The mobile body may also be a mobile body that moves autonomously based on operation commands. It may be a vehicle (e.g., a car, an airplane, etc.), an unmanned mobile body (e.g., a drone, an autonomous vehicle, etc.), or a robot (manned or unmanned). Furthermore, at least one of the base station and the mobile station may include devices that do not necessarily move during communication operations. For example, at least one of the base station and the mobile station may be an Internet of Things (IoT) device such as a sensor.

[0150] Furthermore, the term "base station" in this disclosure may be interpreted as "terminal." For example, the various aspects / embodiments of this disclosure may be applied to a configuration in which communication between a base station and a terminal is replaced with communication between multiple terminals (which may be called, for example, Device-to-Device (D2D), Vehicle-to-Everything (V2X), etc.). In this case, the terminal 200 may have the functions that the base station 100 has. Also, terms such as "uplink" and "downlink" may be interpreted as terms corresponding to terminal-to-terminal communication (for example, "side"). For example, uplink channel, downlink channel, etc., may be interpreted as side channel.

[0151] Similarly, the term "terminal" in this disclosure may be replaced with "base station." In this case, the base station 100 may be configured to have the same functions as the terminal 200 described above.

[0152] Figure 10 shows an example of the configuration of vehicle 2001. As shown in Figure 10, vehicle 2001 includes a drive unit 2002, a steering unit 2003, an accelerator pedal 2004, a brake pedal 2005, a shift lever 2006, left and right front wheels 2007, left and right rear wheels 2008, an axle 2009, an electronic control unit 2010, various sensors 2021 to 2029, an information service unit 2012, and a communication module 2013.

[0153] The drive unit 2002 is composed of, for example, an engine, a motor, or a hybrid of an engine and a motor.

[0154] The steering unit 2003 includes at least a steering wheel (also called a handle) and is configured to steer at least one of the front wheels and the rear wheels based on the operation of the steering wheel, which is operated by the user.

[0155] The electronic control unit 2010 consists of a microprocessor 2031, memory (ROM, RAM) 2032, and communication ports (IO ports) 2033. Signals from various sensors 2021 to 2029 installed in the vehicle are input to the electronic control unit 2010. The electronic control unit 2010 may also be called an Electronic Control Unit (ECU).

[0156] Signals from various sensors 2021 to 2029 include current signals from the current sensor 2021 that senses motor current, front and rear wheel rotation speed signals obtained by the rotation speed sensor 2022, front and rear wheel air pressure signals obtained by the air pressure sensor 2023, vehicle speed signals obtained by the vehicle speed sensor 2024, acceleration signals obtained by the acceleration sensor 2025, accelerator pedal depression signals obtained by the accelerator pedal sensor 2029, brake pedal depression signals obtained by the brake pedal sensor 2026, shift lever operation signals obtained by the shift lever sensor 2027, and detection signals obtained by the object detection sensor 2028 for detecting obstacles, vehicles, pedestrians, etc.

[0157] The Information Services Unit 2012 consists of various devices for providing (outputting) various types of information such as driving information, traffic information, and entertainment information, including car navigation systems, audio systems, speakers, televisions, and radios, and one or more ECUs that control these devices. The Information Services Unit 2012 uses information acquired from external devices via communication modules 2013, etc., to provide various multimedia information and multimedia services to the occupants of the vehicle 2001.

[0158] The Information Services Unit 2012 may include input devices that accept input from external sources (e.g., keyboards, mice, microphones, switches, buttons, sensors, touch panels, etc.) and output devices that output to external sources (e.g., displays, speakers, LED lamps, touch panels, etc.).

[0159] The driver assistance system unit 2030 consists of various devices that provide functions to prevent accidents or reduce the driver's workload, such as millimeter-wave radar, Light Detection and Ranging (LiDAR), cameras, positioning locators (e.g., GNSS), map information (e.g., high-definition (HD) maps, autonomous vehicle (AV) maps), gyro systems (e.g., Inertial Measurement Unit (IMU), Inertial Navigation System (INS)), Artificial Intelligence (AI) chips, and AI processors, as well as one or more ECUs that control these devices. The driver assistance system unit 2030 also sends and receives various information via the communication module 2013 to realize driver assistance functions or autonomous driving functions.

[0160] The communication module 2013 can communicate with the microprocessor 2031 and components of the vehicle 2001 via its communication port. For example, the communication module 2013 sends and receives data via the communication port 2033 between the drive unit 2002, steering unit 2003, accelerator pedal 2004, brake pedal 2005, shift lever 2006, left and right front wheels 2007, left and right rear wheels 2008, axle 2009, the microprocessor 2031 and memory (ROM, RAM) 2032 in the electronic control unit 2010, and sensors 2021 to 2029 provided in the vehicle 2001.

[0161] The communication module 2013 is a communication device that can be controlled by the microprocessor 2031 of the electronic control unit 2010 and can communicate with external devices. For example, it can send and receive various types of information to and from external devices via wireless communication. The communication module 2013 may be located either inside or outside the electronic control unit 2010. The external device may be, for example, a base station or a mobile station.

[0162] The communication module 2013 may transmit at least one of the following to an external device via wireless communication: signals from the various sensors 2021 to 2029 input to the electronic control unit 2010, information obtained based on said signals, and information based on input from an external source (user) obtained via the information service unit 2012. The electronic control unit 2010, the various sensors 2021 to 2029, the information service unit 2012, etc., may also be called input units that accept input. For example, the PUSCH transmitted by the communication module 2013 may include information based on the above input.

[0163] The communication module 2013 receives various information (traffic information, signal information, vehicle-to-vehicle information, etc.) transmitted from external devices and displays it on the information service unit 2012 installed in the vehicle. The information service unit 2012 may also be called an output unit, which outputs information (for example, it outputs information to devices such as displays and speakers based on the PDSCH (or data / information decoded from the PDSCH) received by the communication module 2013).

[0164] Furthermore, the communication module 2013 stores various information received from external devices in memory 2032, which is available to the microprocessor 2031. Based on the information stored in memory 2032, the microprocessor 2031 may control the drive unit 2002, steering unit 2003, accelerator pedal 2004, brake pedal 2005, shift lever 2006, left and right front wheels 2007, left and right rear wheels 2008, axles 2009, sensors 2021 to 2029, etc., which are provided in the vehicle 2001.

[0165] As used in this disclosure, the terms “determining” and “determining” may encompass a wide variety of actions. “Determining” may include, for example, judging, calculating, computing, processing, deriving, investigating, looking up, searching, or inquiring (e.g., searching in a table, database, or other data structure), or ascertaining. “Determining” may also include receiving (e.g., receiving information), transmitting (e.g., sending information), inputting, outputting, or accessing (e.g., accessing data in memory). Furthermore, “determining” may include resolving, selecting, choosing, establishing, or comparing. In other words, "judgment" and "decision" can include considering that some action has been "judged" or "decided." Also, "judgment (decision)" can be reinterpreted as "assuming," "expecting," or "considering."

[0166] The terms “connected,” “coupled,” and any variations thereof mean any direct or indirect connection or coupling between two or more elements, and may include the presence of one or more intermediate elements between two elements that are “connected” or “coupled” with each other. The coupling or connection between elements may be physical, logical, or a combination thereof. For example, “connection” may be reinterpreted as “access.” As used in this disclosure, two elements may be considered to be “connected” or “coupled” with each other using at least one of one or more wires, cables, and printed electrical connections, and, in some non-limiting and non-exclusive examples, electromagnetic energy having wavelengths in the radio frequency domain, microwave domain, and optical (both visible and invisible) domain.

[0167] The reference signal may also be abbreviated as RS, and may be called Pilot depending on the applicable standard.

[0168] In this disclosure, the phrase "based on" does not mean "based solely on" unless otherwise specified. In other words, the phrase "based on" means both "based solely on" and "based at least on."

[0169] Any reference to elements using the designations “first,” “second,” etc., as used in this disclosure does not generally limit the quantity or order of those elements. These designations may be used in this disclosure as a convenient way to distinguish between two or more elements. Accordingly, references to the first and second elements do not imply that only two elements may be employed, or that the first element must precede the second element in any way.

[0170] In the configuration of each of the above devices, "means" may be replaced with "part," "circuit," "device," etc.

[0171] Where the terms “include,” “including,” and variations thereof are used in this disclosure, these terms are intended to be inclusive, as is the term “comprising.” Furthermore, the term “or” as used in this disclosure is not intended to mean exclusive OR.

[0172] A wireless frame may consist of one or more frames in the time domain. Each of these frames in the time domain may be called a subframe. A subframe may further consist of one or more slots in the time domain. A subframe may have a fixed time length (e.g., 1 ms) that is independent of numerology.

[0173] Numerology may be communication parameters applied to at least one of the transmission and reception of a signal or channel. Numerology may include, for example, at least one of the following: subcarrier spacing (SCS), bandwidth, symbol length, cyclic prefix length, transmission time interval (TTI), number of symbols per TTI, radio frame configuration, specific filtering processes performed by the transceiver in the frequency domain, and specific windowing processes performed by the transceiver in the time domain.

[0174] A slot may consist of one or more symbols in the time domain (such as Orthogonal Frequency Division Multiplexing (OFDM) symbols or Single Carrier Frequency Division Multiple Access (SC-FDMA) symbols). A slot may also be a time unit based on neurology.

[0175] A slot may include multiple mini-slots. Each mini-slot may consist of one or more symbols in the time domain. Mini-slots may also be called sub-slots. Mini-slots may consist of fewer symbols than a slot. A PDSCH (or PUSCH) transmitted in a time unit larger than a mini-slot may be called a PDSCH (or PUSCH) mapping type A. A PDSCH (or PUSCH) transmitted using a mini-slot may be called a PDSCH (or PUSCH) mapping type B.

[0176] Wireless frames, subframes, slots, minislots, and symbols all represent units of time when transmitting a signal. Different names may be used for each of these terms.

[0177] For example, one subframe may be called a transmission time interval (TTI), multiple consecutive subframes may be called a TTI, or one slot or one minislot may be called a TTI. In other words, at least one of a subframe and a TTI may be a subframe (1 ms) in existing LTE, a period shorter than 1 ms (e.g., 1 to 13 symbols), or a period longer than 1 ms. Note that the unit representing the TTI may be called a slot, minislot, etc., instead of a subframe.

[0178] Here, TTI refers to, for example, the smallest unit of time for scheduling in wireless communication. For example, in an LTE system, the base station schedules each terminal to allocate radio resources (such as the frequency bandwidth and transmission power available to each terminal) in TTI units. However, the definition of TTI is not limited to this.

[0179] TTI may be a transmission time unit for channel-encoded data packets (transport blocks), code blocks, code words, etc., or it may be a processing unit for scheduling, link adaptation, etc. Note that when a TTI is given, the actual time interval (e.g., number of symbols) in which the transport block, code block, code word, etc. are mapped may be shorter than the given TTI.

[0180] Furthermore, if one slot or one mini-slot is referred to as TTI, then one or more TTIs (i.e., one or more slots or one or more mini-slots) may constitute the minimum time unit of scheduling. In addition, the number of slots (number of mini-slots) that constitute the minimum time unit of scheduling may be controlled.

[0181] A TTI with a time length of 1 ms may also be called a normal TTI (TTI in LTE Rel. 8-12), a long TTI, a normal subframe, a long subframe, or a slot. A TTI shorter than a normal TTI may also be called a shortened TTI, a short TTI, a partial or fractional TTI, a shortened subframe, a short subframe, a mini slot, a subslot, or a slot.

[0182] Furthermore, long TTIs (e.g., normal TTIs, subframes, etc.) may be interpreted as TTIs with a time length exceeding 1 ms, and short TTIs (e.g., shortened TTIs, etc.) may be interpreted as TTIs with a TTI length less than that of a long TTI but 1 ms or more.

[0183] A resource block (RB) is a resource allocation unit in the time domain and frequency domain, and in the frequency domain, it may contain one or more consecutive subcarriers. The number of subcarriers in an RB may be the same regardless of the neurology, for example, 12. The number of subcarriers in an RB may be determined based on the neurology.

[0184] Furthermore, the time domain of RB may contain one or more symbols and may be the length of one slot, one minislot, one subframe, or one TTI. One TTI, one subframe, etc., may each consist of one or more resource blocks.

[0185] One or more RBs may also be called Physical RBs (PRBs), Sub-Carrier Groups (SCGs), Resource Element Groups (REGs), PRB pairs, RB pairs, etc.

[0186] Furthermore, a resource block may consist of one or more resource elements (REs). For example, one RE may be a radio resource area comprising one subcarrier and one symbol.

[0187] A Bandwidth Part (BWP), also known as a partial bandwidth, may represent a subset of consecutive common resource blocks (RBs) for a given neurology in a given carrier. Here, the common RBs may be identified by an index of the RBs relative to the carrier's common reference point. The PRBs may be defined and numbered within a given BWP.

[0188] A BWP may include BWPs for UL (UL BWP) and BWPs for DL ​​(DL BWP). One or more BWPs may be configured within a single carrier for a UE.

[0189] At least one of the configured BWPs may be active, and the UE does not need to assume that it will send or receive a given signal / channel outside of the active BWP. In this disclosure, terms such as "cell" and "carrier" may be read as "BWP".

[0190] The structures described above, such as wireless frames, subframes, slots, minislots, and symbols, are merely illustrative. For example, the number of subframes included in a wireless frame, the number of slots per subframe or wireless frame, the number of minislots included in a slot, the number of symbols and RBs included in a slot or minislot, the number of subcarriers included in an RB, and the number of symbols, symbol length, and cyclic prefix (CP) length within a TTI can be varied in various ways.

[0191] In this disclosure, if articles are added through translation, such as a, an, and the in English, this disclosure may include the fact that the noun following these articles is plural.

[0192] In this disclosure, the term "A and B are different" may mean "A and B are different from each other." The term may also mean "A and B are each different from C." Terms such as "separate" and "combine" may be interpreted similarly to "different."

[0193] Although the present disclosure has been described in detail above, it will be clear to those skilled in the art that the present disclosure is not limited to the embodiments described herein. The present disclosure can be implemented in modified and altered forms without departing from the intent and scope of the present disclosure as defined by the claims. Therefore, the descriptions in the present disclosure are illustrative and not intended to be restrictive in any way.

[0194] This application is based on Japanese Patent Application No. 2025-019355, filed on February 7, 2025. All of its contents are included here.

[0195] 10 Wireless communication system 20 Network 100 Base station 110 Wireless communication unit 120 Notification information provision unit 130 Control unit 200 Terminal 210 Wireless communication unit 220 Notification information acquisition and storage unit 230 Control unit 1001 Processor 1002 Memory 1003 Storage 1004 Communication device 1005 Input device 1006 Output device 1007 Bus 2001 Vehicle 2002 Drive unit 2003 Steering unit 2004 Accelerator pedal 2005 Brake pedal 2006 Shift lever 2007 Left and right front wheels 2008 Left and right rear wheels 2009 Axle 2010 Electronic control unit 2012 Information service unit 2013 Communication module 2021 Current sensor 2022 Rotation speed sensor 2023 Air pressure sensor 2024, Vehicle speed sensor 2025, Acceleration sensor 2026, Brake pedal sensor 2027, Shift lever sensor 2028, Object detection sensor 2029, Accelerator pedal sensor 2030, Driver assistance system unit 2031, Microprocessor 2032, Memory (ROM, RAM) 2033, Communication port (IO port)

Claims

1. A terminal comprising a receiving unit in a first cell that receives system information from a plurality of second cells, and a control unit that holds the system information from the plurality of second cells and applies the system information in the second cell at the destination.

2. The terminal according to claim 1, wherein the control unit makes the system information it holds valid in a predetermined area or for a predetermined period of time.

3. The terminal according to claim 1, wherein the system information held includes information that can be commonly applied to a plurality of the second cells.

4. The terminal according to claim 1, wherein the receiving unit receives affiliation information of the second cell, and the control unit determines whether to apply the held system information to the second cell based on the affiliation information.

5. A base station comprising a control unit that adds affiliation information to which the second cell belongs, which is transmitted in the second cell, to the system information of the second cell, and a transmission unit that transmits the system information of the second cell to which the affiliation information has been added in the first cell.

6. A terminal communication method comprising the steps of: receiving system information of a plurality of second cells in a first cell; and holding the system information of the plurality of second cells and applying the system information in the second cell at the destination.

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