Terminal, wireless base station, and wireless communication method

Abstract

This terminal receives a cell type indication indicating whether a neighboring cell is formed by a wireless base station that provides wireless backhaul, and transmits, to a serving cell or a candidate cell of a transition destination, the cell type indication indicating that the neighboring cell is formed by the wireless base station that provides the wireless backhaul.

Description

Terminal, Radio Base Station, and Radio Communication Method

[0001] The present disclosure relates to a terminal that supports Wireless Access Backhaul (WAB), a radio base station, and a radio communication method.

[0002] The 3rd Generation Partnership Project (3GPP: registered trademark) is standardizing 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] For example, in Release-19 of 3GPP, studies on Wireless Access Backhaul (WAB) are underway (Non-Patent Document 1). Specifically, the architecture and protocol stack of WAB are being studied. It has been agreed that the WAB-gNB, which is equivalent to a radio base station (gNB) that can provide the WAB function, does not provide the Mobile Termination (MT) function for connecting to a higher-level node on the network side (Non-Patent Document 2). Also, support for the Xn interface by the WAB-gNB and a method for avoiding Xn configuration between WAB-gNBs are being studied (Non-Patent Document 3).

[0004] In addition, a terminal (User Equipment, UE) has an Automatic Neighbour Relation (ANR) function and can automatically generate and update information on the neighbouring cells of the UE, specifically, the Neighbour Relation Table (NRT). This enables an appropriate handover of the UE.

[0005] 3GPP TR 38.799 V0.0.1 (R3-243171), 3rd Generation Partnership Project; Technical Specification Group RAN; NR; Study on additional topological enhancements for NR (Release 19), 3GPP, March 2024 “Report of 3GPP TSG RAN3 meeting #123-bis”, 3GPP TSG RAN3 meeting #124, 3GPP, May 2024 “New WID on additional topological enhancements for NR”, 3GPP TSG RAN Meeting #105, 3GPP, September 2024

[0006] The aforementioned ANR function can be used to configure the Xn interface between gNBs. However, since WAB-gNBs may be installed and moved in vehicles such as trains and buses, it is desirable to avoid configuring the Xn interface using the ANR function.

[0007] However, current reports on ANR indicate that the UE cannot recognize whether the target cell is formed by WAB-gNB, making it difficult to prevent the setting of the Xn interface.

[0008] Therefore, the following disclosure is made in light of these circumstances and aims to provide a terminal, wireless base station, and wireless communication method that can reliably prevent the setting of an Xn interface using the ANR function when a WAB-gNB is in motion.

[0009] One aspect of the present disclosure is a terminal (UE200) comprising a receiving unit (system information acquisition unit 220) that receives a cell type display indicating whether or not a neighboring cell is a cell formed by a wireless base station that provides wireless backhaul, and a transmitting unit (measurement reporting unit 230) that transmits a cell type display indicating that the neighboring cell is a cell formed by the wireless base station that provides the wireless backhaul to a serving cell or a candidate destination cell.

[0010] One aspect of the present disclosure is a radio base station (gNB100) comprising: a receiving unit (UE connection control unit 130) that receives a cell type indication from a terminal indicating that a neighboring cell is a cell formed by a radio base station that provides radio backhaul; and a control unit (control unit 140) that determines whether or not an interface for connecting to the radio base station forming the neighboring cell can be configured based on the cell type indication.

[0011] Figure 1 is an overall schematic diagram of the wireless communication system 10. Figure 2 is a diagram showing the basic architecture of a network according to WAB. Figure 3 is a diagram showing an example of the WAB architecture configuration when NG traffic of WAB-gNB is transmitted via PDU session backhaul. Figure 4 is a functional block diagram of gNB100. Figure 5 is a diagram showing an example of the configuration of the ANR function unit 120. Figure 6 is a functional block diagram of UE200. Figure 7 is a diagram showing an example of the configuration of a WAB cell and neighboring cells related to a basic operation example. Figure 8 is a diagram showing an example of the sequence of measurement reports related to a detailed operation example. Figure 9 is a diagram showing an example of the configuration of CGI-InfoNR. Figure 10 is a diagram showing an example of the hardware configuration of gNB100, WAB node 150 and UE200. Figure 11 is a diagram showing an example of the configuration of vehicle 2001.

[0012] 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.

[0013] (1) Overall schematic diagram 1 of the wireless communication system is an overall schematic diagram of the wireless communication system 10 according to this embodiment. The wireless communication system 10 is a wireless communication system in accordance with 5G New Radio (NR) and includes a Next Generation-Radio Access Network 20 (hereinafter referred to as NG-RAN20) and a terminal 200 (User Equipment 200, hereinafter referred to as UE200).

[0014] The wireless communication system 10 may be a wireless communication system conforming to a method called Beyond 5G, 5G Evolution, or 6G, or it may include a wireless communication system conforming to a method called Long Term Evolution (LTE) or 4G. The wireless communication system 10 may support functions related to the Industrial Internet of Things (IIoT) and URLLC (Ultra-Reliable and Low Latency Communications).

[0015] NG-RAN20 includes a wireless base station 100 (hereinafter referred to as gNB100) and a WAB node 150. The specific configuration of the wireless communication system 10, including the number of gNBs (or eNBs, etc.), WAB nodes, and UEs, is not limited to the example shown in Figure 1.

[0016] Furthermore, the gNB100 may employ a fronthaul (FH) interface as defined by the O-RAN (Open Radio Access Network Alliance). The gNB100 may include an O-DU (O-RAN Distributed Unit) and an O-RU (O-RAN Radio Unit). The gNB100 can function as a type of NG-RAN node.

[0017] WAB node 150 is a type of wireless communication node that conforms to Wireless Access Backhaul (WAB).

[0018] NG-RAN20 actually includes multiple NG-RAN Nodes, specifically gNBs (or ng-eNBs), and is connected to a 5G-compliant core network (5GC, not shown). 5GC may include logical nodes that provide network functions (NFs). NFs may include an Access and Mobility Management Function (SMF) that provides access and mobility management functions for UE200, a Session Management Function (SMF) that provides session management functions, and a Location Management Function (LMF) that handles communication control related to location information services defined in 5GC. Furthermore, UDM / UDRs (Unified Data Management / User Data Repository) may be connected to the AMF and / or SMF.

[0019] NG-RAN20 and 5GC may simply be referred to as "networks." In 5GC, the concept of CUPS (Control and User Plane Separation), in which the functions of the user plane and the control plane are clearly separated, may be introduced.

[0020] The gNB100 is a radio base station compliant with NR and performs NR-compliant wireless communication with the UE200. The gNB100 may also consist of a CU (Central Unit) and a DU (Distributed Unit), and the DU may be located separately from the CU at a geographically different location. One or more DUs may be connected to the CU. The gNB100 (gNB-CU) may be connected by an Xn interface, and the CU and DU may be connected by an F1 interface (F1-AP, etc.). In this embodiment, the CU may be called a communication device or a central device, etc. The DU may be called a distributed device, etc.

[0021] In the wireless communication system 10, a Neighbor Relation Table (NRT, also called an NCRT (Neighbor Cell Relation Table)) may be used for handover (HO) of the UE200 to other cells and for managing the identification information (CGI: Cell Global Identifier) ​​of neighboring cells. The contents of the NRT may be manually pre-configured, but an Automatic Neighbor Relation (ANR) function that automatically associates information (CGI) of neighboring cells may be introduced.

[0022] Figure 2 shows the basic architecture of a network compliant with WAB. Figure 3 shows an example configuration of the WAB architecture when NG traffic of WAB-gNB is transmitted via PDU session backhaul.

[0023] As shown in Figures 2 and 3, the WAB node 150 may consist of a WAB-gNB that provides an interface with the UE200 and a WAB-MT that provides an interface with a higher-level node on the network side (e.g., gNB100). The UE200 and the AMF may be connected via an NG-C interface. The UE200 and the WAB node 150 may be connected via an NR-Uu interface.

[0024] gNB100 and UPF may function as serving nodes for WAB-MT. AMF may function as a serving node for UE200. gNB100 and WAB node 150 may be connected via an NR-Uu interface, and gNB100 and UPF may be connected via an NG-U interface. Note that WAB-MT may be interpreted as having the same functionality as UE. Also, gNB serving WAB-MT may be read as BH gNB or donor gNB, and 5GC serving WAB-MT may be read as BH 5GC.

[0025] The gNB100 and UE200 can support Massive MIMO, which generates a more directional beam by controlling the radio signals transmitted from multiple antenna elements; carrier aggregation (CA), which uses multiple component carriers (CCs) bundled together; and dual connectivity (DC), which enables simultaneous communication between the UE and multiple NG-RAN Nodes.

[0026] The DC type may be Multi-RAT Dual Connectivity (MR-DC), which utilizes multiple radio access technologies, or NR-NR Dual Connectivity (NR-DC), which utilizes only NR. For example, one gNB may constitute the master node (MN), and one or more other gNBs may constitute secondary nodes (SN).

[0027] Note that the term "secondary node" may be interpreted as "secondary cell" or "secondary cell group (SCG)."

[0028] In this embodiment, the channel includes a control channel and a data channel. The control channel includes PDCCH (Physical Downlink Control Channel), PUCCH (Physical Uplink Control Channel), PRACH (Physical Random Access Channel), and PBCH (Physical Broadcast Channel), among others.

[0029] Furthermore, data channels include PDSCH (Physical Downlink Shared Channel) and PUSCH (Physical Uplink Shared Channel), among others.

[0030] Reference signals include Demodulation Reference Signal (DMRS), Sounding Reference Signal (SRS), Phase Tracking Reference Signal (PTRS), and Channel State Information-Reference Signal (CSI-RS), while signals include channels and reference signals. Furthermore, "data" may refer to data transmitted via a data channel.

[0031] Furthermore, Layer 1 can be interpreted as including lower layers such as the physical layer. Layer 3 is a layer higher than Layer 1. The upper layers may include at least one of the following: the Wireless Link Control Layer (RLC), the Packet Data Convergence Protocol Layer (PDCP), or the Wireless Resource Control Layer (RRC), and the Media Access Control Layer (MAC) may be positioned between the lower and upper layers.

[0032] (2) Functional Block Configuration of the Wireless Communication System Next, the functional block configuration of the wireless communication system 10 will be described. Specifically, the functional block configurations of gNB100 and UE200 will be described. Figure 4 is a functional block configuration diagram of gNB100. Figure 6 is a functional block configuration diagram of UE200.

[0033] (2.1) gNB100 As shown in Figure 4, the gNB100 comprises a wireless communication unit 110, an ANR function unit 120, a UE connection control unit 130, and a control unit 140.

[0034] The wireless communication unit 110 transmits a downlink signal (DL signal) in accordance with NR. The wireless communication unit 110 also receives an uplink signal (UL signal) in accordance with NR.

[0035] The ANR function unit 120 provides functions related to ANR (Automatic Neighbor Relation). Specifically, the ANR function unit 120 can automatically associate information about neighboring cells.

[0036] Figure 4 shows an example configuration of the ANR function unit 120. As shown in Figure 4, the ANR function unit may consist of an NCRT Management Function, a Neighbor Removal Function, and a Neighbor Detection Function.

[0037] The Neighbor Cell Relation Table (NCRT) may consist of an NCR section (NCR, TCI (Transmission Configuration Indication)) and an O&M controlled attributes section (No Remove, No HO, No Xn). Such ANR functionality may also conform to the provisions of, for example, 3GPP TS38.300 Chapter 15.3.3.1.

[0038] The ANR function unit 120 may receive neighbor cell information from the UE200. The neighbor cell information may consist of information such as identification information (e.g., CGI) and the frequency band used for neighbor cells formed in the vicinity of the serving cell. Neighbor cells may also be called adjacent cells, neighboring cells, or surrounding cells, and a part (or all) of the cell's area may overlap with the area of ​​another cell. Furthermore, it is not limited to spatially adjacent cells, but may also include cells that are frequency- or logically adjacent or overlapping.

[0039] The UE connection control unit 130 controls the handover (which may also be called cell reselection, transition, etc.) from the UE200's serving cell to other neighboring cells. Specifically, the UE connection control unit 130 can perform a handover to a neighboring cell that meets handover conditions such as quality, based on NRT or ANR functions.

[0040] Furthermore, the UE connection control unit 130 may control transitions such as handover to neighboring cells according to the characteristics of those neighboring cells. In this embodiment, the UE connection control unit 130 may receive a cell type display regarding neighboring cells from the UE 200. In this embodiment, the UE connection control unit 130 may be configured as a receiving unit for receiving the cell type display.

[0041] Here, the cell type indication may indicate that neighboring cells are cells formed by a radio base station (gNB) that provides a wireless backhaul. The wireless backhaul may be referred to as Wireless Access Backhaul (WAB). Specifically, the radio base station that provides the wireless backhaul may mean a WAB-gNB (WAB node 150). The WAB may be provided by a radio interface (e.g., NR-Uu) between the gNB 100 and the WAB node 150. Also, the WAB may provide a backhaul connection for a PDU session with the 5GC.

[0042] The control unit 140 controls each functional block constituting the gNB 100. In particular, in this embodiment, the control unit 140 can manage (generate and update, etc.) the association (NCR) of neighboring cells of the UE 200 and execute control of the ANR function and the like.

[0043] Specifically, the control unit 140 may control settings regarding the neighboring cell based on the cell type indication of the neighboring cell. For example, when the neighboring cell is a cell formed by a gNB (WAB node 150) that provides a wireless backhaul (WAB), the control unit 140 may determine whether to set an interface for connecting to the gNB forming the neighboring cell. The interface may be an interface between gNBs (RAN nodes). Typically, the Xn interface is mentioned, but in the case where the gNB has a CU-DU configuration, etc., the F1 interface may be targeted. Alternatively, the interface between DUs may be targeted.

[0044] The cell type indication may be received from the UE 200 or may be received from another gNB (including the WAB-gNB).

[0045] When it is indicated by the cell type display that neighboring cells are cells formed by a WAB-gNB, the control unit 140 may cancel the setting of the interface. Specifically, the control unit 140 may avoid establishing a connection through an interface (such as Xn) with the WAB-gNB. Note that, for a WAB-gNB, the setting may be unconditionally canceled, or when the WAB-gNB satisfies specific conditions, for example, when it is mounted on a vehicle such as a train or a bus and moves, the setting of the interface may be canceled.

[0046] The control unit 140 may determine whether to apply an automatic setting function (ANR function) for neighboring cells based on the cell type display. Specifically, when it is indicated by the cell type display that neighboring cells are cells formed by a WAB-gNB, the control unit 140 may cancel the application of the automatic setting function. By canceling the application of the ANR function, the above-described interface setting may also be canceled.

[0047] (2.2) UE200 As shown in FIG. 6, the UE200 includes a radio communication unit 210, a system information acquisition unit 220, a measurement report unit 230, and a control unit 240.

[0048] The radio communication unit 210 transmits an uplink signal (UL signal) according to NR. Also, the radio communication unit 210 receives a downlink signal (DL signal) according to NR. In the present embodiment, the radio communication unit 210 may constitute a communication unit that performs radio communication with a WAB node 150 (radio communication node) connected to a network via a radio backhaul. Note that the radio communication unit 210 can also perform radio communication with the WAB node 150 via radio access, or can directly perform radio communication with the gNB 100 via radio access.

[0049] The system information acquisition unit 220 acquires system information notified from the network. Specifically, the system information acquisition unit 220 can receive a plurality of types of system information blocks (SIBs) from the network.

[0050] In particular, in this embodiment, the system information acquisition unit 220 may receive system information indicating the type of neighboring cell, including the cell formed by the WAB node 150 (wireless communication node).

[0051] Specifically, the system information acquisition unit 220 may receive an SIB1 that includes the type of neighboring cell of UE200. However, it does not necessarily have to be SIB1; the system information may also be broadcast by another SIB (for example, SIB4).

[0052] The system information acquisition unit 220 may receive system information indicating the type of cell formed by WAB nodes (wireless communication nodes) mounted on a mobile device, WAB nodes not mounted on a mobile device, or WAB nodes that provide the function of a wireless base station. Here, a mobile device typically refers to a vehicle on which multiple users ride, such as a train or other railway, or a bus. However, it is not limited to such vehicles and may also include aircraft, ships, or small automobiles.

[0053] Furthermore, the system information acquisition unit 220 may receive a cell type indicator that shows whether or not a neighboring cell is a cell formed by a wireless base station (WAB-gNB) that provides wireless backhaul. In this embodiment, the system information acquisition unit 220 may be configured as a receiving unit that receives the cell type indicator.

[0054] Specifically, the system information acquisition unit 220 may receive system information from the network (gNB) that includes the cell type display (for example, it may be displayed as WAB cell or WAB-gNB cell).

[0055] The measurement reporting unit 230 can measure the quality of the UE200's serving cell and its neighbor cell, and report a measurement report showing the measurement results to the network. The measurement reporting unit 230 may perform measurement reporting of the source cell and target cell during handover. The measurement reporting unit 230 may transmit a measurement report including the quality of the serving cell and neighbor cell.

[0056] The quality of the object being measured can be, for example, the quality included in the Measurement Report as defined in 3GPP TS38.331 (e.g., Reference Signal Received Power (RSRP), Reference Signal Received Quality (RSRQ)).

[0057] Furthermore, the measurement reporting unit 230 may transmit a cell type indicator to the serving cell or a candidate destination cell indicating that a neighboring cell is a cell formed by WAB-gNB. In this embodiment, the measurement reporting unit 230 may constitute a transmission unit for transmitting the cell type indicator. Specifically, the measurement reporting unit 230 may transmit a measurement report including the cell type indicator to the network (gNB).

[0058] In relation to the target cell, a serving cell may simply be interpreted as the cell to which the UE200 is connected. More precisely, in the case of an RRC_CONNECTED UE where carrier aggregation (CA) is not configured, there is only one serving cell that constitutes the primary cell. In the case of an RRC_CONNECTED UE configured with CA, a serving cell may be interpreted as representing one or more sets of cells, including the primary cell and all secondary cells.

[0059] The control unit 240 controls each functional block that constitutes the UE200. In particular, in this embodiment, the control unit 240 may select a cell based on system information (e.g., SIB1) acquired by the measurement reporting unit 230. Specifically, the control unit 240 may select the cell to connect to based on the cell type of the neighboring cells of the UE200 included in the system information.

[0060] As described above, the cell type may include cells formed by WAB nodes mounted on mobile vehicles such as trains, WAB nodes not mounted on mobile vehicles, or WAB nodes that provide the functionality of a wireless base station.

[0061] Furthermore, the control unit 240 may control the measurement reporting unit 230, etc., based on the content of the cell type display indicating that a neighboring cell is a cell formed by WAB-gNB. For example, if the control unit 240 receives a cell type display from the network (gNB) indicating that a neighboring cell is a cell formed by WAB-gNB, it may send a measurement report containing a similar cell type display to the network (gNB).

[0062] (3) Operation of the Wireless Communication System Next, the operation of the wireless communication system 10 will be described. Specifically, the operation of the UE and WAB nodes related to Wireless Access Backhaul (WAB) will be described.

[0063] (3.1) Premise 3GPP has agreed that, with respect to Wireless Access Backhaul (WAB), a WAB node may include components of gNB (WAB-gNB) and components of Mobile Termination (MT) (WAB-MT). On the other hand, it has also been agreed that WAB-gNB does not provide the functionality of WAB-MT.

[0064] Based on these agreements, the architecture and protocol stack of WAB are being considered (see Figures 2 and 3).

[0065] (3.2) Basic Operation Example Figure 7 shows an example of the configuration of a WAB cell and neighboring cells related to the basic operation example. As shown in Figure 7, when a WAB node is installed on a vehicle such as a train or bus, the cell formed by the WAB node (WAB-gNB-Cell) will move. In such cases, the UEs under the cell need to prioritize selecting that cell (referred to as a mobile WAB-Cell (or WAB Cell)).

[0066] If a UE under the WAB node selects a different neighboring cell (gNB), unnecessary HOs and RLFs may occur. Conversely, if a UE not under the WAB node selects a WAB-gNB-Cell, unnecessary HOs and RLFs may also occur. Therefore, UEs need to distinguish between mobile WAB-Cells (WAB-gNB-Cells) and regular cells.

[0067] (3.3) Problem As described above, the wireless communication system 10 can use the ANR function to configure the Xn interface between gNBs (establish connection). However, as described above, WAB-gNBs are installed in vehicles such as trains and buses and may be in motion, so it is desirable to avoid configuring the Xn interface with WAB-gNBs.

[0068] However, existing ANR reporting (CGIInfoNR) simply includes information such as the tracking area code(s), RANAC (RAN-AreaCode)(s), PLMN (Public Land Mobile Network) IDs, NR frequency band(s), and gNB ID length(s) of adjacent cells, but it cannot indicate whether the cell in question is under the control of a WAB-gNB (i.e., a cell formed by a WAB-gNB).

[0069] CGI-InfoNR provides information related to cell access and may be reported by the UE as part of the CGI reporting procedure.

[0070] (3.4) Detailed Operation Example Figure 8 shows an example sequence of measurement reports related to the detailed operation example. Figure 9 shows an example configuration of CGI-InfoNR.

[0071] As shown in Figure 8, the UE may receive information regarding the measurement settings (measConfig) from the gNB. Specifically, the UE may receive a ReportConfigNR that includes cellForWhichToReportCGI. cellForWhichToReportCGI may be indicated by the Physical Cell ID (PCI).

[0072] In a CGI procedure, if a neighboring cell is a cell under WAB-gNB, the UE may obtain the cell type indication reported by SIB within that cell, specifically the indication that it is a cell under WAB-gNB (for example, WAB cell or WAB-gNB cell).

[0073] Furthermore, if a neighboring cell is a cell under the control of a WAB-gNB, the UE may include an indication (e.g., WAB cell or WAB-gNB cell) in the CGI-InfoNR within the CGI procedure (see Figure 9). The UE may also report this indication to the gNB when reporting an ANR. In this case as well, the indication may be included in the CGI-InfoNR.

[0074] The gNB may determine the type of neighboring cell based on the indication received from the UE. When adding the cell to the NCRT, the gNB may add an indication that it is a cell under the WAB-gNB (e.g., WAB cell or WAB-gNB cell).

[0075] According to this example of operation, even when the ANR function is applied and cells formed by WAB-gNBs are present, it is possible to reliably prevent the establishment of an interface (Xn interface) with the WAB-gNB (establishment of connection).

[0076] Furthermore, when adding a cell to NCRT, the gNB can also add an indication that it is a cell under the WAB-gNB. Therefore, even when the ANR function is applied and cells formed by WAB-gNBs are present, it is possible to reliably prevent the establishment of an interface (Xn interface) with the WAB-gNB (establishment of connection).

[0077] This ensures that the configuration of the inter-gNB interface with WAB-gNBs that may be installed on vehicles such as trains and buses and may be in motion can be reliably avoided, and the UE can achieve more appropriate cell selection even when cells formed by WAB-gNBs are mixed.

[0078] (4) Other Embodiments The contents of the present invention have been described above in accordance with the embodiments, but 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.

[0079] For example, the above example assumed a WAB, but WAB is just a placeholder name, and similar operation may be applied to any network architecture that utilizes wireless backhaul (and wireless access), other than WAB (e.g., IAB).

[0080] In the above description, configure, activate, update, indicate, enable, specify, and select may be interpreted as interchangeable. Similarly, link, associate, correspond, and map may be interpreted as interchangeable, and allocate, assign, monitor, and map may also be interpreted as interchangeable.

[0081] Furthermore, "specific," "dedicated," "UE specific," and "UE individual" may be interpreted interchangeably. Similarly, "common," "shared," "group-common," "UE common," and "UE shared" may be interpreted interchangeably.

[0082] The block diagrams (Figures 4 and 6) used in the description of the embodiments above 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.

[0083] 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 any case, as mentioned above, the method of implementation is not particularly limited.

[0084] Furthermore, the gNB100, WAB node 150, and UE200 (the device) described above may function as a computer that processes the wireless communication method of this disclosure. Figure 10 shows an example of the hardware configuration of the device. As shown in Figure 10, the device may be configured as a computer device including a processor 1001, memory 1002, storage 1003, communication device 1004, input device 1005, output device 1006, and bus 1007.

[0085] In the following explanation, the term "device" can be replaced with "circuit," "device," "unit," etc. The hardware configuration of the device may include one or more of the devices shown in the diagram, or it may be configured to omit some of the devices.

[0086] Each functional block of the device (see Figures 4 and 6) is implemented by any hardware element of the computer device, or a combination of such hardware elements.

[0087] Furthermore, each function in the device 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.

[0088] 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.

[0089] 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. Moreover, the above-mentioned various processes may be executed by one processor 1001, or by two or more processors 1001 simultaneously or sequentially. The processor 1001 may be implemented by one or more chips. The program may also be transmitted from a network via a telecommunications line.

[0090] 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. Memory 1002 may also be called a register, cache, main memory, etc. Memory 1002 can store a program (program code), software module, etc., that can execute a method according to one embodiment of this disclosure.

[0091] 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. Storage 1003 may also be called an auxiliary storage device. The recording medium described above may also be, for example, a database, server, or other suitable medium including at least one of memory 1002 and storage 1003.

[0092] 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.

[0093] The communication device 1004 may be configured to include, for example, a high-frequency switch, a duplexer, a filter, a frequency synthesizer, etc., in order to implement at least one of frequency division duplex (FDD) and time division duplex (TDD).

[0094] 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).

[0095] Furthermore, each device, such as the processor 1001 and the 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.

[0096] Furthermore, the device may 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 implemented by such hardware. For example, processor 1001 may be implemented using at least one of these hardware components.

[0097] Furthermore, notification of information is not limited to the embodiments described herein and may be carried out by other means. For example, notification of information may be carried out by physical layer signaling (e.g., Downlink Control Information (DCI), Uplink Control Information (UCI)), upper layer signaling (e.g., 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.

[0098] Each aspect / embodiment described herein may be applied to at least one of the following: 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), 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 next-generation systems extended 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).

[0099] 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.

[0100] 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).

[0101] 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.

[0102] 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 sent to other devices.

[0103] 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).

[0104] 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).

[0105] 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.

[0106] 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 technologies (such as coaxial cable, fiber optic cable, twisted pair, or Digital Subscriber Line (DSL)) and wireless technologies (such as infrared or microwave), then at least one of these wired and wireless technologies is included in the definition of a transmission medium.

[0107] 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.

[0108] 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.

[0109] The terms “system” and “network” as used in this disclosure are interchangeable.

[0110] Furthermore, the information, parameters, etc., described in this disclosure may be expressed using absolute values, relative values ​​from a given value, or corresponding other information. For example, wireless resources may be indicated by an index.

[0111] 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. Since various channels (e.g., PUCCH, PDCCH, etc.) and information elements can be identified by any suitable name, the various names assigned to these various channels and information elements are not restrictive in any way.

[0112] 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.

[0113] 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 can also be provided with communication services by a base station subsystem (e.g., a small indoor base station (Remote Radio Head: RRH)).

[0114] The terms "cell" or "sector" refer to a portion or all of the coverage area of ​​at least one of the base stations and base station subsystems that provide communication services in this coverage.

[0115] 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.

[0116] In this disclosure, terms such as "Mobile Station (MS)," "user terminal," "User Equipment (UE)," and "terminal" may be used interchangeably.

[0117] 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 some other appropriate term.

[0118] 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 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). At least one of the base station and the mobile station may also be a device that does not necessarily move during communication operation. 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.

[0119] Furthermore, the term "base station" in this disclosure may be interpreted as "mobile station" (user terminal, hereinafter the same). For example, the various aspects / embodiments of this disclosure may be applied to a configuration in which communication between a base station and a mobile station is replaced with communication between multiple mobile stations (which may be called, for example, Device-to-Device (D2D), Vehicle-to-Everything (V2X), etc.). In this case, the mobile station may have the functions that a base station 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 (or side link).

[0120] Similarly, the term "mobile station" in this disclosure may be interpreted as "base station." In this case, the base station may be configured to have the functions that a mobile station has.

[0121] A wireless frame may consist of one or more frames in the time domain. Each of these one or more 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.

[0122] 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.

[0123] 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.

[0124] 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 PDSCH (or PUSCH) mapping type A. A PDSCH (or PUSCH) transmitted using a mini-slot may be called PDSCH (or PUSCH) mapping type B.

[0125] 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.

[0126] 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 in existing LTE (1ms), a period shorter than 1ms (e.g., 1-13 symbols), or a period longer than 1ms. Note that the unit representing the TTI may be called a slot, minislot, etc., instead of a subframe.

[0127] 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 user terminal to allocate wireless resources (such as the frequency bandwidth and transmission power available to each user terminal) in TTI units. However, the definition of TTI is not limited to this.

[0128] 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.

[0129] 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.

[0130] A TTI with a time length of 1ms may also be called a normal TTI, long TTI, normal subframe, long subframe, slot, etc. A TTI shorter than a normal TTI may also be called a shortened TTI, short TTI, partial or fractional TTI, shortened subframe, short subframe, mini slot, sub slot, slot, etc.

[0131] 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.

[0132] 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.

[0133] 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.

[0134] One or more RBs may also be called a Physical RB (PRB), Sub-Carrier Group (SCG), Resource Element Group (REG), PRB pair, RB pair, etc.

[0135] 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.

[0136] 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. PRBs may be defined and numbered within a given BWP.

[0137] A BWP may include BWPs for UL (UL BWP) and BWPs for DL ​​(DL BWP). One or more BWPs may be set within a single carrier for a UE.

[0138] 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".

[0139] 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.

[0140] 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.

[0141] The reference signal can also be abbreviated as Reference Signal (RS), and may be called a pilot depending on the applicable standard.

[0142] 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."

[0143] In the configuration of each of the above devices, "means" may be replaced with "part," "circuit," "device," etc.

[0144] Any reference to elements using designations such as “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 therein, or that the First element must precede the Second element in any way.

[0145] 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 be exclusive OR.

[0146] 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.

[0147] The terms “determining” and “determining” as used in this disclosure may encompass a wide variety of actions. “Determining” and “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” and “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, "judgment" and "decision" can include considering something as having "judgmented" or "decided" after resolving, selecting, choosing, establishing, comparing, etc. In other words, "judgment" and "decision" can include considering something as having "judgmented" or "decided" about some action. Also, "judgment (decision)" can be reinterpreted as "assuming," "expecting," or "considering."

[0148] 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."

[0149] Figure 11 shows an example of the configuration of vehicle 2001. As shown in Figure 11, 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.

[0150] The drive unit 2002 consists of, for example, an engine, a motor, or a hybrid of an engine and a motor. 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 rear wheels based on the operation of the steering wheel operated by the user. 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 2027 provided in the vehicle are input to the electronic control unit 2010. The electronic control unit 2010 may also be called an ECU (Electronic Control Unit).

[0151] Signals from various sensors 2021 to 2028 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.

[0152] 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 a car navigation system, audio system, speakers, television, and radio, and one or more ECUs that control these devices. The Information Services Unit 2012 uses information acquired from external devices via a communication module 2013, etc., to provide various multimedia information and multimedia services to the occupants of Vehicle 1.

[0153] 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 perform output to external sources (e.g., displays, speakers, LED lamps, touch panels, etc.).

[0154] 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, LiDAR (Light Detection and Ranging), cameras, positioning locators (e.g., GNSS), map information (e.g., high-definition (HD) maps, autonomous vehicle (AV) maps), gyro systems (e.g., IMU (Inertial Measurement Unit), INS (Inertial Navigation System)), AI (Artificial Intelligence) 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.

[0155] The communication module 2013 can communicate with the microprocessor 2031 and components of the vehicle 1 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 2028 provided in the vehicle 2001.

[0156] 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.

[0157] 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 2028 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 2028, 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.

[0158] The communication module 2013 receives various information (traffic information, signal information, distance 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, 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). The communication module 2013 also stores the 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 2021-2028, etc., installed in the vehicle 2001.

[0159] (Note) The above disclosure may also be expressed as follows: The first feature is a terminal comprising a receiving unit that receives a cell type indicator indicating whether or not a neighboring cell is a cell formed by a radio base station that provides radio backhaul, and a transmitting unit that transmits a cell type indicator indicating that the neighboring cell is a cell formed by the radio base station that provides the radio backhaul to a serving cell or a candidate destination cell.

[0160] The second feature is a radio base station comprising: a receiving unit that receives a cell type display from a terminal indicating that a neighboring cell is a cell formed by a radio base station that provides radio backhaul; and a control unit that determines whether or not an interface to connect to the radio base station forming the neighboring cell can be set based on the cell type display.

[0161] The third feature is that, in the second feature, the control unit cancels the interface configuration if the neighboring cell is a cell formed by the wireless base station that provides the wireless backhaul, according to the cell type display.

[0162] The fourth feature is that, in the second or third feature, the control unit determines whether or not to apply the automatic setting function for neighboring cells based on the cell type display.

[0163] The fifth feature is that, in the second to fourth features, the control unit discontinues the application of the automatic setting function if the neighboring cell is a cell formed by the wireless base station that provides the wireless backhaul, as indicated by the cell type display.

[0164] This patent application claims priority based on Japanese Patent Application No. 2024-201744, filed on 19 November 2024, and the entire contents of Japanese Patent Application No. 2024-201744 are incorporated herein by reference.

[0165] 10 Wireless communication system 20 NG-RAN 100 gNB 110 Wireless communication unit 120 ANR function unit 130 UE connection control unit 140 Control unit 150 WAB node 200 UE 210 Wireless communication unit 220 System information acquisition unit 230 Measurement reporting unit 240 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

Claims

1. A terminal comprising: a receiving unit that receives a cell type indicator indicating whether or not a neighboring cell is a cell formed by a wireless base station that provides wireless backhaul; and a transmitting unit that transmits a cell type indicator indicating that the neighboring cell is a cell formed by the wireless base station that provides the wireless backhaul to a serving cell or a candidate destination cell.

2. A radio base station comprising: a receiving unit that receives a cell type display from a terminal indicating that a neighboring cell is a cell formed by a radio base station that provides radio backhaul; and a control unit that determines whether or not an interface to connect to the radio base station forming the neighboring cell can be configured based on the cell type display.

3. The radio base station according to claim 2, wherein the control unit cancels the setting of the interface when the neighboring cell is a cell formed by the radio base station that provides the radio backhaul, according to the cell type display.

4. The control unit determines whether or not to apply the automatic setting function for neighboring cells based on the cell type display, according to claim 2.

5. The radio base station according to claim 4, wherein the control unit discontinues applying the automatic setting function if the neighboring cell is a cell formed by the radio base station that provides the radio backhaul, according to the cell type display.

6. A wireless communication method in a terminal, comprising the steps of: receiving a cell type indicator indicating whether a neighboring cell is a cell formed by a radio base station that provides wireless backhaul; and transmitting the cell type indicator indicating that the neighboring cell is a cell formed by the radio base station that provides the wireless backhaul to a serving cell or a candidate destination cell.

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