Network node, wireless communication system, and communication method

Abstract

A network node is provided with: a reception unit that receives a registration request from a terminal; a control unit that acquires registration information of a network node that controls registration of terminals belonging to a group including the terminals, and determines, on the basis of the registration information, whether or not a master node passed by the registration request is a different master node from another terminal belonging to the group; and a transmission unit that, if a master node is different from another terminal belonging to the group, transmits, to a network node that manages a subscriber of the terminal, a registration request including an identifier identifying the master node.

Description

Technical Field

[0001] The present invention relates to a network node in a wireless communication system, a wireless communication system and a communication method. Background Art

[0002] In NR (New Radio) (also called "5G"), which is the successor system to LTE (Long Term Evolution), a network architecture including 5GC (5G Core Network) and NG-RAN (Next Generation-Radio Access Network) is being studied. The 5GC (5G Core Network) corresponds to the core network in the network architecture of LTE (Long Term Evolution), namely EPC (Evolved Packet Core), and the NG-RAN (Next Generation-Radio Access Network) corresponds to the RAN (Radio Access Network) in the network architecture of LTE, namely E-UTRAN (Evolved Universal Terrestrial Radio Access Network) (for example, non-patent document 1 and non-patent document 2).

[0003] In addition, in NR, mechanisms to improve the communication reliability of 5G networks are being studied. For example, communication that duplexes the paths between terminals and RAN and between RAN and UPF (User plane function) has been standardized.

[0004] Prior art literature

[0005] Non-patent literature

[0006] Non-patent document 1: 3GPP TS23.501V17.2.0 (2021-09)

[0007] Non-patent document 2: 3GPP TS23.502V17.2.1 (2021-09) Summary of the invention

[0008] Problems to be solved by the invention

[0009] The use case of using a mobile communication network in remote driving of a car is being studied. Therefore, it is considered to improve the redundancy of communication and improve the reliability of communication by using multiple PLMN (Public Land Mobile Network) networks / SNPN (Stand-alone Non-Public Network) networks and multiple wireless accesses at the same time. However, from the perspective of the business model of communication operation, it is difficult to build a system that uses multiple PLMN networks / SNPN networks and multiple wireless accesses at the same time. Therefore, technology for ensuring redundant communication in one PLMN network is considered. However, in the above-mentioned prior art, MN (Master Node) (Master Node of RAN) and AMF (Access and Mobility Management Function) become single points of failure, and redundancy is not fully achieved.

[0010] The present invention has been made in view of the above-mentioned problems, and an object of the present invention is to realize redundancy of communications in a wireless communication system.

[0011] Means for solving problems

[0012] According to the disclosed technology, a network node is provided, which comprises: a receiving unit, which receives a registration request from a terminal; a control unit, which obtains registration information of a network node that controls the registration of a terminal belonging to a group including the terminal, and determines, based on the registration information, whether the master node passed through in the registration request is a master node different from other terminals belonging to the group; and a sending unit, which sends a registration request including an identifier identifying the master node to a network node that manages subscribers of the terminal if the master node is a master node different from other terminals belonging to the group.

[0013] Effects of the Invention

[0014] According to the disclosed technology, a technology capable of achieving redundancy of communications in a wireless communication system is provided. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 It is a diagram for explaining a wireless communication system according to an embodiment of the present invention.

[0016] Figure 2 This is a diagram showing an example of the configuration of a wireless communication system according to an embodiment of the present invention.

[0017] Figure 3 This is a sequence diagram showing an example of the flow of the terminal registration process according to the embodiment of the present invention.

[0018] Figure 4This is a sequence diagram showing an example of the flow of the event notification process according to the embodiment of the present invention.

[0019] Figure 5 This is a sequence diagram showing an example of the flow of the switching process according to the embodiment of the present invention.

[0020] Figure 6 This is a diagram showing an example of a functional configuration of a base station according to an embodiment of the present invention.

[0021] Figure 7 This is a diagram showing an example of a functional configuration of a terminal according to an embodiment of the present invention.

[0022] Figure 8 This is a diagram showing an example of the hardware configuration of a base station or a terminal according to an embodiment of the present invention.

[0023] Fig. 9 It is a diagram showing an example of the structure of a vehicle according to an embodiment of the present invention. DETAILED DESCRIPTION

[0024] Hereinafter, an embodiment of the present invention will be described with reference to the drawings. In addition, the embodiment described below is an example, and the embodiment to which the present invention is applied is not limited to the following embodiment.

[0025] In the operation of the wireless communication system of the embodiment of the present invention, existing technologies can be appropriately used. The existing technologies are, for example, existing NR or LTE, but are not limited to existing NR or LTE. In addition, unless otherwise specified, the term "LTE" used in this specification has a broad meaning including LTE-Advanced and subsequent methods (e.g., NR) of LTE-Advanced.

[0026] In addition, in the embodiments of the present invention described below, the terms SS (Synchronization signal), PSS (Primary SS), SSS (Secondary SS), PBCH (Physical broadcast channel), PRACH (Physical random access channel), PDCCH (Physical Downlink Control Channel), PDSCH (Physical Downlink Shared Channel), PUCCH (Physical Uplink Control Channel), PUSCH (Physical Uplink Shared Channel), etc. used in the existing LTE are used. These are for the convenience of recording, and the same signals, functions, etc. may also be referred to by other names. In addition, the above terms in NR correspond to NR-SS, NR-PSS, NR-SSS, NR-PBCH, NR-PRACH, etc. However, even if it is a signal used for NR, it is not necessarily clearly recorded as "NR-".

[0027] Furthermore, in the embodiments of the present invention, the duplexing method may be a TDD (Time Division Duplex) method, an FDD (Frequency Division Duplex) method, or other methods (for example, Flexible Duplex, etc.).

[0028] Furthermore, in the embodiments of the present invention, “configuring” wireless parameters and the like may be pre-configuring predetermined values, or may be configuring wireless parameters notified from a base station or a terminal.

[0029] (System Structure)

[0030] Figure 1 It is a diagram for explaining a wireless communication system according to an embodiment of the present invention.

[0031] like Figure 1 As shown, the wireless communication system in the embodiment of the present invention includes a base station 10 and a terminal 20. Figure 1 In the figure, one base station 10 and one terminal 20 are shown, but this is an example and a plurality of base stations 10 and a plurality of terminals 20 may be provided.

[0032] The base station 10 is a communication device that provides one or more cells and performs wireless communication with the terminal 20. The physical resources of the wireless signal are defined in the time domain and the frequency domain. The time domain can be defined by the number of OFDM (Orthogonal Frequency Division Multiplexing) symbols, and the frequency domain can be defined by the number of subcarriers or resource blocks. In addition, the TTI (Transmission Time Interval) in the time domain can be a time slot, and the TTI can also be a subframe.

[0033] The base station 10 sends a synchronization signal and system information to the terminal 20. The synchronization signal is, for example, NR-PSS and NR-SSS. The system information is, for example, sent via NR-PBCH, also known as broadcast information. The synchronization signal and system information may also be referred to as SSB (SS / PBCH block). Figure 1 As shown, the base station 10 sends a control signal or data to the terminal 20 via DL (Downlink), and receives a control signal or data from the terminal 20 via UL (Uplink). Both the base station 10 and the terminal 20 can perform beamforming to send and receive signals. In addition, both the base station 10 and the terminal 20 can apply MIMO (Multiple Input Multiple Output)-based communications to DL or UL. In addition, the base station 10 and the terminal 20 can also communicate via a secondary cell (SCell: Secondary Cell) and a primary cell (PCell: Primary Cell) based on CA (Carrier Aggregation). Furthermore, the terminal 20 can also communicate via the primary cell of the base station 10 based on DC (Dual Connectivity) and the primary and secondary cell group cells (PSCell: Primary SCG Cell) of other base stations 10.

[0034] The terminal 20 is a communication device having a wireless communication function, such as a smart phone, a mobile phone, a tablet computer, a wearable terminal, or an M2M (Machine-to-Machine) communication module. Figure 1As shown, the terminal 20 receives a control signal or data from the base station 10 via DL and sends a control signal or data to the base station 10 via UL, thereby utilizing various communication services provided by the wireless communication system. In addition, the terminal 20 receives various reference signals sent from the base station 10 and performs a measurement of the propagation path quality based on the reception result of the reference signal. In addition, the terminal 20 may also be referred to as a UE and the base station 10 may be referred to as a gNB.

[0035] Figure 2 The wireless communication system includes a RAN 10 , a plurality of terminals (a first UE 20 - 1 , a second UE 20 - 2 , a third UE 20 - 3 , etc.), a core network 30 , and a DN (Data Network) 40 .

[0036] The RAN 10 may be a device including a base station for performing dual connectivity (DC). For example, the RAN 10 includes a MN and a SN (Secondary Node). Here, the conventional RAN 10 includes one MN, but the RAN 10 of this embodiment includes a plurality of MNs (a first MN 11-1, a second MN 11-2, a third MN 11-3, etc.) for redundancy.

[0037] The core network 30 is a network including switches, a subscriber information management device, etc. The core network 30 includes a network node group that realizes the U-Plane function and a network node group that realizes the C-Plane function group.

[0038] The U-Plane function is a function for performing the sending and receiving processing of user data. A network node that implements the U-Plane function is, for example, UPF (User plane function) 380. UPF 380 is a network node that has functions such as an external PDU (Protocol Data Unit) session point for interconnection with DN 40, routing and forwarding of packets, and QoS (Quality of Service) processing of the user plane. UPF 380 controls the sending and receiving of data between DN 40 and UE-CP 20-1 or UE-UP 20-2. UPF 380 and DN 40 can be composed of one or more network slices.

[0039] The C-Plane function group is a function group that performs a series of control processes for communication establishment, etc. The network node group that realizes the C-Plane function group includes, for example, AMF (Access and Mobility Management Function), UDM (Unified Data Management) 320, NEF (Network Exposure Function) 330, NRF (Network Repository Function) 340, AUSF (Authentication Server Function) 350, PCF (Policy Control Function) 360, SMF (Session Management Function) 370, and AF (Application Function) 390.

[0040] AMF is a network node having functions such as termination of RAN interface, termination of NAS (Non-Access Stratum), registration management, connection management, reachability management, mobility management, etc. Here, the conventional core network 30 includes one AMF, while the core network 30 of this embodiment includes multiple AMFs (first AMF 310-1, second AMF 310-2, third AMF 310-3, etc.) for redundancy.

[0041] NRF 340 is a network node having a function of discovering NF (Network Function) instances that provide services. UDM 320 is a network node that manages subscriber data and authentication data. UDM 320 includes UDR (User Data Repository) 321 and FE (Front End) 322 that hold the data. FE 322 processes subscriber information.

[0042] SMF 370 is a network node having functions such as session management, IP (Internet Protocol) address allocation and management of UE-CP 20-1 or UE-UP 20-2, DHCP (Dynamic Host Configuration Protocol) function, ARP (Address Resolution Protocol) proxy, roaming function, etc. NEF 330 is a network node having the function of notifying other NFs (Network Functions) of capabilities and events. PCF 360 is a network node having the function of performing policy control of the network.

[0043] AF (Application Function) 390 is a network node having a function of controlling an application server.

[0044] The first AMF 310-1 and the first MN 11-1, the second AMF 310-2 and the second MN 11-2, and the third AMF 310-3 and the third MN 11-3 are connected as N2 links in a manner that allows communication. In addition, the UPF 380 and the first MN 11-1, the second MN 11-2, and the third MN 11-3 are connected as N3 links in a manner that allows communication. The UPF 380 and the SMF 370 are connected as N4 links in a manner that allows communication. The UPF 380 and the DN 40 are connected as N6 links in a manner that allows communication.

[0045] Here, the first UE 20-1, the second UE 20-2, and the third UE 20-3 are examples of terminals belonging to the same group. These terminals are assigned, for example, the same internal group ID for redundant communication. Through the registration process described later, these terminals are connected to different MNs, respectively. For example, the first UE 20-1 is connected to the first MN 11-1, the second UE 20-2 is connected to the second MN 11-2, and the third UE 20-3 is connected to the third MN 11-3.

[0046] Next, the registration process of each terminal is explained. As a prerequisite, it is enabled to set the "Global RAN Node ID" of the MN in the AMF registration information registered with the UDM 320. Here, the "Global RAN Node ID" is assigned to be able to identify the MN and function as an identifier of the MN. In addition, a registration event disclosure service of the AMF that accommodates the specified terminal is defined for the UDM 320. The registration event disclosure service of the AMF that accommodates the specified terminal is a service that discloses the occurrence of AMF registration events when the specified terminal is accommodated. When the AMF subscribes to the registration event disclosure service of the AMF that accommodates the specified terminal, when the AMF that accommodates the specified terminal is registered with the UDM 320, the UDM 320 sends a notification of the content (registration event notification of the AMF that accommodates the specified terminal) to the subscribed AMF.

[0047] Figure 3 1 is a sequence diagram showing an example of the flow of the terminal registration process according to the embodiment of the present invention. The first UE 20-1 sends a registration request including an internal group ID to the first AMF 310-1 via the first MN 11-1 (step S101).

[0048] The first AMF 310-1 identifies the "global RAN node ID" of the MN (first MN 11-1) through the interface of the used N2 link. Then, the first AMF 310-1 specifies the internal group ID and sends a request for the terminal ID belonging to the group to the UDM 320 (step S102).

[0049] The UDM 320 transmits a response indicating the terminal IDs belonging to the group to the first AMF 310-1 (step S103).

[0050] Next, the first AMF 310-1 specifies the terminal ID and sends a request for accommodating the registration information of the AMF of each terminal to the UDM 320 (step S104).

[0051] The UDM 320 sends a response indicating registration information of the AMF accommodating each terminal to the first AMF 310-1 (step S105).

[0052] The first AMF 310-1 determines whether the "global RAN node ID" in one AMF registration information is the same as the MN passed through.

[0053] When the first AMF 310-1 determines that the "global RAN node ID" in one AMF registration information is the same as the MN passed through, it sends a UE context release instruction (UE Context Release Command) to the first MN 11-1 (step S106). The first MN 11-1 sends an RRC release instruction (RRC Release) to the first UE 20-1, and the RRC release instruction includes information prompting reselection to the cell of other MN (step S107).

[0054] The first UE 20-1 reselects another MN (step S108), and returns to the process of step S101.

[0055] On the other hand, when the first AMF 310-1 determines that the "global RAN node ID" in all AMF registration information is different from the MN passed through, and when the AMF-NF instance ID in one AMF registration information indicates itself, it selects other AMFs as "target AMFs" and performs the AMF reallocation process (step S109). In addition, the AMF reallocation process is a process disclosed in non-patent document 2, which is a reallocation process from the "initial AMF" to the "target AMF".

[0056] In addition, the first AMF 310-1 may also notify other AMFs of the AMF registration information for the AMF that has not subscribed to the registration event disclosure service of the AMF that accommodates the specified terminal.

[0057] In addition, when the AMF-NF instance ID in all AMF registration information does not represent itself, the first AMF 310-1 skips the process of step S109.

[0058] Next, the first AMF 310-1 registers including the "global RAN node ID" of the first MN 11-1 (step S110). The first AMF 310-1 sends a subscription request to the UDM 320 for the registration event disclosure service of the AMF that accommodates the designated terminal (step S111). Here, the first AMF 310-1 uses the terminal belonging to the same internal group as the accommodated terminal as the designated terminal and makes a subscription request to the registration event disclosure service of the AMF that accommodates the designated terminal. Thus, the registration process of the first UE 20-1 ends.

[0059] The second UE 20-2 and the third UE 20-3 also perform the same registration process. Thus, different MNs and different AMFs accommodate the first UE 20-1, the second UE 20-2, and the third UE 20-3.

[0060] Next, a description is given of a process in which the UDM 320 notifies an event indicating that the AMF accommodating the designated terminal has been registered.

[0061] Figure 4 This is a sequence diagram showing an example of the flow of the event notification process according to the embodiment of the present invention.

[0062] When the AMF accommodating the specified terminal is registered in step S110 of the above registration process, UDM 320 sends a registration event notification of the AMF accommodating the specified terminal to the AMF (e.g., the first AMF 310-1) that subscribes to the registration event disclosure service of the AMF accommodating the specified terminal at this time point (step S201).

[0063] The AMF (eg, the first AMF 310-1) that has received the notification stores AMF registration information about terminals (hereinafter referred to as group terminals) constituting the same internal group as the accommodated terminal (step S202).

[0064] Next, the handover process when the terminal moves is described.

[0065] Figure 5 1 is a sequence diagram showing an example of the flow of the handover process according to the embodiment of the present invention. The first MN 11-1 sends a handover request (Handover Required) to the first AMF 310-1 (step S301). The first AMF 310-1 determines whether the group terminal is using the destination MN.

[0066] When the first AMF 310-1 determines that the group terminal is using the destination MN, it sends a notification indicating a handover preparation failure (Handover Preparation Failure) to the first MN 11-1 (step S302). The first MN 11-1 changes the destination MN (step S303), and returns to step S301.

[0067] On the other hand, when the first AMF 310-1 determines that the group terminal does not use the destination MN, if a change of AMF is required, it selects a mobile destination AMF that is not used by the group terminal (step S304). Then, the first AMF 310-1 completes the handover (step S305).

[0068] The first AMF 310-1 is registered with the UDM 320 including the "global RAN node ID" of the destination MN, or, when the AMF is changed, the mobile destination AMF is registered with the UDM 320 including the "global RAN node ID" of the destination MN (step S306).

[0069] As a result, the terminal's mobile destination MN and mobile destination AMF do not overlap with the MN and AMF being used by other group terminals.

[0070] According to this embodiment, the AMF can refer to the AMF registration information of other group terminals that are different from the accommodated terminal, and avoid using the same MN and AMF as other group terminals during the registration process or the switching process when the terminal moves. As a result, multiple terminals belonging to the internal group can perform redundant communication. For example, by mounting multiple terminals belonging to the same internal group on a car, redundant communication in the car can be achieved.

[0071] In addition, in the above-mentioned embodiment, an example of making both MN and AMF redundant is shown, but either MN or AMF can be made redundant. Thus, an appropriate structure can be implemented by considering the trade-off between the necessity of redundancy and the cost and system complexity.

[0072] (Device Structure)

[0073] Next, the functional configuration examples of the base station 10, the terminal 20, and various network nodes that implement the above-described processing and operations are described. The base station 10, the terminal 20, and various network nodes include functions for implementing the above-described embodiments. However, the base station 10, the terminal 20, and various network nodes may each only have a portion of the functions in the embodiments.

[0074] <Base Station 10 and Network Node>

[0075] Figure 6 1 is a diagram showing an example of the functional configuration of the base station 10. Figure 6 As shown, the base station 10 includes a transmission unit 110 , a reception unit 120 , a setting unit 130 , and a control unit 140 . Figure 6 The functional structure shown is only an example. As long as the actions of the embodiments of the present invention can be implemented, the functional division and the name of the functional unit can be arbitrary. In addition, the network node can have the same functional structure as the base station 10. In addition, a network node having multiple different functions in the system architecture can be composed of multiple network nodes separated by function.

[0076] The transmitter 110 includes a function of generating a signal to be sent to the terminal 20 or other network nodes and transmitting the signal by wire or wirelessly. The receiver 120 includes a function of receiving various signals sent from the terminal 20 or other network nodes and obtaining, for example, higher layer information from the received signals.

[0077] The setting unit 130 stores in a storage device the setting information set in advance and various setting information to be transmitted to the terminal 20, and reads out from the storage device as needed. The content of the setting information is, for example, setting related to communication using the NTN.

[0078] As described in the embodiment, the control unit 140 performs processing related to communication using the NTN. In addition, the control unit 140 performs processing related to communication with the terminal 20. In addition, the control unit 140 performs processing related to verification of the geographical location of the terminal 20. The functional unit related to signal transmission in the control unit 140 may be included in the transmission unit 110, and the functional unit related to signal reception in the control unit 140 may be included in the reception unit 120.

[0079] <Terminal 20>

[0080] Figure 7 2 is a diagram showing an example of the functional structure of the terminal 20. Figure 7 As shown, the terminal 20 includes a transmitting unit 210 , a receiving unit 220 , a setting unit 230 , and a control unit 240 . Figure 7 The functional structure shown is only an example. As long as the operation of the embodiment of the present invention can be implemented, the functional division and the name of the functional unit can be arbitrary. The USIM installed in the terminal 20 can also have a transmitting unit 210, a receiving unit 220, a setting unit 230 and a control unit 240 in the same manner as the terminal 20.

[0081] The transmitting unit 210 generates a transmission signal according to the transmission data and transmits the transmission signal wirelessly. The receiving unit 220 receives various signals wirelessly and obtains a higher layer signal from the received physical layer signal. In addition, the receiving unit 220 has a function of receiving NR-PSS, NR-SSS, NR-PBCH, DL / UL control signal or reference signal, etc. sent from the network node.

[0082] The setting unit 230 stores various setting information received from the network node by the receiving unit 220 in a storage device, and reads it from the storage device as needed. In addition, the setting unit 230 also stores pre-set setting information.

[0083] The network node or wireless communication system of this embodiment may also be configured as the network node or wireless communication system shown in the following items. In addition, the following communication method may also be implemented.

[0084] <Structure Related to This Embodiment>

[0085] (Item 1)

[0086] A network node, comprising:

[0087] a receiving unit, which receives a registration request from a terminal;

[0088] a control unit that obtains registration information of a network node that controls registration of a terminal belonging to a group including the terminal, and determines, based on the registration information, whether a master node passed through in the registration request is a master node different from that of other terminals belonging to the group; and

[0089] A sending unit sends a registration request including an identifier identifying the master node to a network node that manages subscribers of the terminal, if the master node is different from other terminals belonging to the group.

[0090] (Item 2)

[0091] The network node according to item 1, wherein

[0092] The sending unit sends a subscription request for notifying that a registration request of the other terminal belonging to the group has been received to a network node that manages subscribers of the other terminal belonging to the group.

[0093] The receiving unit receives, based on the subscription, registration information indicating a registered network node from a network node that manages subscribers of other terminals belonging to the group.

[0094] (Item 3)

[0095] The network node according to item 1 or 2, wherein:

[0096] The control unit selects a network node that is not used by other terminals belonging to the group as a network node to be a reallocation destination based on the registration information.

[0097] (Item 4)

[0098] The network node according to any one of items 1 to 3, wherein:

[0099] The receiving unit receives a handover request accompanying movement of the terminal,

[0100] The control unit selects a network node that is not used by other terminals belonging to the group as a network node to be a movement destination based on the registration information.

[0101] (Item 4)

[0102] A wireless communication system comprises a plurality of network nodes for controlling the registration of a terminal and a plurality of master nodes for wirelessly communicating with the terminal, wherein:

[0103] The plurality of network nodes respectively include:

[0104] A receiving unit, which receives a registration request from the terminal;

[0105] a control unit that obtains registration information of a network node that controls registration of a terminal belonging to a group including the terminal, and determines, based on the registration information, whether a master node passed through in the registration request is a master node different from that of other terminals belonging to the group; and

[0106] A sending unit sends a registration request including an identifier identifying the master node to a network node that manages subscribers of the terminal, if the master node is different from other terminals belonging to the group.

[0107] (Item 5)

[0108] A communication method is performed by a network node and comprises the following steps:

[0109] receiving a registration request from a terminal;

[0110] obtaining registration information of a network node that controls registration of a terminal belonging to a group including the terminal, and determining, based on the registration information, whether a master node passed through in the registration request is a master node different from that of other terminals belonging to the group; and

[0111] In the case of a master node different from other terminals belonging to the group, a registration request including an identifier identifying the master node is sent to a network node that manages subscribers of the terminal.

[0112] Any of the above structures can provide a technology that can realize redundancy of communication in a wireless communication system. According to item 1, in the case of a master node different from other terminals belonging to the group, a registration request including an identifier identifying the master node can be sent to a network node that manages subscribers of the terminal. According to item 2, registration information indicating that network nodes of other terminals belonging to the group are registered can be received from the network node that manages subscribers of the terminal. According to items 3 and 4, based on the registration information, a network node that is not used by other terminals belonging to the group can be selected as a network node as a reallocation destination or a mobile destination.

[0113] (Hardware Structure)

[0114] The block diagram used in the description of the above embodiment ( Figure 6 and Figure 7) shows blocks in units of functions. These functional blocks (structural parts) are implemented by any combination of at least one of hardware and software. In addition, there is no particular limitation on the implementation method of each functional block. That is, each functional block can be implemented using one device that is physically or logically combined, or it can be implemented by connecting two or more physically or logically separated devices directly or indirectly (for example, using wires, wirelessly, etc.) and using these multiple devices. The functional blocks can also be implemented by combining software in the above-mentioned one device or the above-mentioned multiple devices.

[0115] Functions include judging, determining, judging, calculating, calculating, processing, deriving, investigating, searching, confirming, receiving, sending, outputting, accessing, solving, selecting, selecting, establishing, comparing, assuming, expecting, regarding, broadcasting, notifying, communicating, forwarding, configuring, reconfiguring, allocating, mapping, assigning, etc., but are not limited to these. For example, a functional block (structural unit) that performs a sending function is called a transmitting unit or a transmitter. In short, as mentioned above, there is no particular limitation on the implementation method.

[0116] For example, the network node, the terminal 20, etc. in one embodiment of the present disclosure may also function as a computer that performs the processing of the wireless communication method of the present disclosure. Figure 8 1 is a diagram showing an example of the hardware structure of the base station 10 and the terminal 20 according to one embodiment of the present disclosure. The network node may have the same hardware structure as the base station 10. The USIM may have the same hardware structure as the terminal 20. The base station 10 and the terminal 20 may also be configured as a computer device that physically includes a processor 1001, a storage device 1002, an auxiliary storage device 1003, a communication device 1004, an input device 1005, an output device 1006, and a bus 1007.

[0117] In the following description, the word "device" may be replaced by "circuit", "device", "unit", etc. The hardware configuration of the base station 10 and the terminal 20 may include one or more of the devices shown in the figure, or may exclude some of the devices.

[0118] Each function in the base station 10 and the terminal 20 is implemented by the following method: predetermined software (program) is read into hardware such as the processor 1001 and the storage device 1002, so that the processor 1001 performs calculations and controls the communication of the communication device 1004 or controls at least one of the reading and writing of data in the storage device 1002 and the auxiliary storage device 1003.

[0119] The processor 1001 controls the entire computer by, for example, operating an operating system. The processor 1001 may also be composed of a central processing unit (CPU) including an interface with peripheral devices, a control device, a computing device, registers, etc. For example, the control unit 140, the control unit 240, etc. may also be implemented by the processor 1001.

[0120] In addition, the processor 1001 reads a program (program code), a software module, or data from at least one of the auxiliary storage device 1003 and the communication device 1004 to the storage device 1002, and performs various processes accordingly. As a program, a program that causes the computer to execute at least a part of the actions described in the above embodiments is used. For example, Figure 6 The control unit 140 of the base station 10 shown may also be implemented by a control program stored in the storage device 1002 and executed in the processor 1001. In addition, for example, Figure 7 The control unit 240 of the terminal 20 shown can also be implemented by a control program stored in the storage device 1002 and operated in the processor 1001. Although it is described that the above-mentioned various processes are performed by one processor 1001, the above-mentioned various processes can also be performed simultaneously or sequentially by two or more processors 1001. The processor 1001 can also be implemented by one or more chips. In addition, the program can also be sent from the network via a telecommunication line.

[0121] The storage device 1002 is a computer-readable recording medium, and may be composed of at least one of ROM (Read Only Memory), EPROM (Erasable Programmable ROM), EEPROM (Electrically Erasable Programmable ROM), RAM (Random Access Memory), etc. The storage device 1002 may also be referred to as a register, a cache, a main memory (main storage device), etc. The storage device 1002 can store executable programs (program codes), software modules, etc. for implementing the communication method involved in one embodiment of the present disclosure.

[0122] The auxiliary storage device 1003 is a computer-readable recording medium, and may be composed of at least one of an optical disk such as a CD-ROM (CompactDisc ROM), a hard disk drive, a floppy disk, a magneto-optical disk (e.g., a compact disk, a digital versatile disk, a Blu-ray (registered trademark) disk, a smart card, a flash memory (e.g., a card, a stick, a key drive), a Floppy (registered trademark) disk, a magnetic strip, etc. The above-mentioned storage medium may be, for example, a database, a server, and other appropriate media including at least one of the storage device 1002 and the auxiliary storage device 1003.

[0123] The communication device 1004 is hardware (transceiver device) for communicating between computers via at least one of a wired network and a wireless network, and is also called a network device, a network controller, a network card, a communication module, etc. The communication device 1004 may also be configured to include a high-frequency switch, a duplexer, a filter, a frequency synthesizer, etc., to implement at least one of frequency division duplex (FDD: Frequency Division Duplex) and time division duplex (TDD: Time Division Duplex). For example, a transceiver antenna, an amplifier, a transceiver, a transmission path interface, etc. may also be implemented by the communication device 1004. The transceiver may also be implemented by physically or logically separating the transmitter and the receiver.

[0124] The input device 1005 is an input device that receives input from the outside (e.g., a keyboard, a mouse, a microphone, a switch, a button, a sensor, etc.). The output device 1006 is an output device that implements output to the outside (e.g., a display, a speaker, an LED light, etc.). In addition, the input device 1005 and the output device 1006 may also be integrally formed (e.g., a touch panel).

[0125] In addition, the processor 1001 and the storage device 1002 and other devices are connected via a bus 1007 for communicating information. The bus 1007 may be configured using a single bus or different buses may be used between the devices.

[0126] In addition, the base station 10 and the terminal 20 may be configured to include hardware such as a microprocessor, a digital signal processor (DSP), an ASIC (Application Specific Integrated Circuit), a PLD (Programmable Logic Device), and an FPGA (Field Programmable Gate Array), and a part or all of each functional block may be implemented by the hardware. For example, the processor 1001 may also be implemented using at least one of these hardware.

[0127] Fig. 9 FIG. 2 shows a structural example of a vehicle 2001. Fig. 9 As shown, the vehicle 2001 includes a driving unit 2002, a steering unit 2003, an accelerator pedal 2004, a brake pedal 2005, a shift lever 2006, front wheels 2007, 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. Each form / embodiment described in the present disclosure may also be applied to a communication device mounted on the vehicle 2001, for example, may also be applied to the communication module 2013.

[0128] The driving unit 2002 is composed 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 referred to as a steering wheel), and is configured to steer at least one of the front wheels and the rear wheels based on the operation of the steering wheel operated by a user.

[0129] The electronic control unit 2010 is composed of a microprocessor 2031, a memory (ROM, RAM) 2032, and a communication port (IO port) 2033. Signals from various sensors 2021 to 2029 provided in the vehicle 2001 are input to the electronic control unit 2010. The electronic control unit 2010 may also be referred to as an ECU (Electronic Control Unit).

[0130] As signals from various sensors 2021~2029, there are current signals from the current sensor 2021 that senses the current of the motor, speed signals of the front wheels and rear wheels obtained by the speed sensor 2022, air pressure signals of the front wheels and rear wheels 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 amount signals obtained by the accelerator pedal sensor 2029, brake pedal depression amount signals obtained by the brake pedal sensor 2026, shift lever operation signals obtained by the shift lever sensor 2027, detection signals for detecting obstacles, vehicles, pedestrians, etc. obtained by the object detection sensor 2028, and the like.

[0131] The information service unit 2012 is composed of various devices such as a car navigation system, an audio system, a speaker, a television, and a radio for providing (outputting) various information such as driving information, traffic information, and entertainment information, and one or more ECUs for controlling these devices. The information service unit 2012 provides various multimedia information and multimedia services to passengers of the vehicle 2001 using information obtained from external devices via the communication module 2013 and the like.

[0132] The information service unit 2012 may include input devices for accepting input from the outside (e.g., keyboard, mouse, microphone, switch, button, sensor, touch panel, etc.), and may also include output devices for implementing output to the outside (e.g., display, speaker, LED light, touch panel, etc.).

[0133] The driving assistance system unit 2030 is composed of various devices for preventing accidents or reducing the driver's driving load, such as millimeter wave radar, LiDAR (Light Detection and Ranging), camera, positioning device (such as GNSS, etc.), map information (such as high-definition (HD) map, autonomous driving vehicle (AV) map, etc.), gyroscope system (such as IMU (Inertial Measurement Unit), INS (Inertial Navigation System), etc.), AI (Artificial Intelligence) chip, AI processor, and one or more ECUs that control these devices. In addition, the driving assistance system unit 2030 sends and receives various information via the communication module 2013 to realize the driving assistance function or the autonomous driving function.

[0134] The communication module 2013 can communicate with the microprocessor 2031 and the components of the vehicle 2001 via the communication port. For example, the communication module 2013 transmits and receives data with the drive unit 2002, the steering unit 2003, the accelerator pedal 2004, the brake pedal 2005, the shift lever 2006, the front wheel 2007, the rear wheel 2008, the axle 2009, the microprocessor 2031 in the electronic control unit 2010, the memory (ROM, RAM) 2032, and the sensors 2021 to 2029 via the communication port 2033.

[0135] The communication module 2013 can be controlled by the microprocessor 2031 of the electronic control unit 2010, and is a communication device that can communicate with an external device. For example, various information can be sent and received with the external device via wireless communication. The communication module 2013 can be located inside or outside the electronic control unit 2010. The external device can also be, for example, a base station, a mobile station, etc.

[0136] The communication module 2013 may transmit at least one of the signals from the various sensors 2021 to 2029 input to the electronic control unit 2010, information obtained based on the signals, and information based on input from the outside (user) obtained via the information service unit 2012 to an external device via wireless communication. The electronic control unit 2010, the various sensors 2021 to 2029, the information service unit 2012, etc. may also be referred to as an input unit that receives input. For example, the PUSCH transmitted by the communication module 2013 may include information based on the above input.

[0137] The communication module 2013 receives various information (traffic information, signal information, vehicle-to-vehicle information, etc.) sent from an external device, and displays it on the information service unit 2012 provided in the vehicle 2001. The information service unit 2012 may also be referred to as an output unit that outputs information (for example, outputs information to a display, a speaker, etc. based on the PDSCH received by the communication module 2013 (or data / information decoded from the PDSCH)).

[0138] In addition, the communication module 2013 stores various information received from the external device in the memory 2032 that can be used by the microprocessor 2031. The microprocessor 2031 can also control the drive unit 2002, the steering unit 2003, the accelerator pedal 2004, the brake pedal 2005, the shift lever 2006, the front wheel 2007, the rear wheel 2008, the axle 2009, the sensors 2021 to 2029, etc., which are provided in the vehicle 2001, based on the information stored in the memory 2032.

[0139] (Supplementary Implementation Methods)

[0140] The above describes the embodiments of the present invention, but the disclosed invention is not limited to such embodiments, and those skilled in the art should understand various variations, modifications, alternatives, replacements, etc. In order to promote the understanding of the invention, specific numerical examples are used for description, but unless otherwise specified, these numerical values ​​are only examples, and any appropriate value can be used. The item distinction in the above description is not essential to the present invention. The items recorded in more than two items can be combined and used as needed, and the items recorded in a certain item can be applied to the items recorded in another item (as long as there is no contradiction). The boundaries of the functional units or processing units in the functional block diagram do not necessarily correspond to the boundaries of the physical components. The actions of multiple functional units can be performed by one physical component, or the actions of one functional unit can be performed by multiple physical components. Regarding the processing process described in the embodiment, the order of processing can be swapped without contradiction. In order to facilitate the description of the processing, the base station 10 and the terminal 20 are described using a functional block diagram, but such a device can also be implemented by hardware, software, or a combination thereof. The software that operates according to the implementation mode of the present invention through the processor of the base station 10 and the software that operates according to the implementation mode of the present invention through the processor of the terminal 20 can also be stored in random access memory (RAM), flash memory, read-only memory (ROM), EPROM, EEPROM, registers, hard disk (HDD), removable disk, CD-ROM, database, server and any other appropriate storage medium.

[0141] In addition, the notification of information is not limited to the form / implementation method described in the present disclosure, and other methods may also be used. For example, the notification of information may be implemented through physical layer signaling (e.g., DCI (Downlink Control Information), UCI (Uplink Control Information)), high-level signaling (e.g., RRC (Radio Resource Control) signaling, MAC (Medium Access Control) signaling), broadcast information (MIB (Master Information Block), SIB (System Information Block)), other signals or a combination thereof. In addition, RRC signaling may be referred to as an RRC message, for example, an RRC Connection Setup message, an RRC Connection Reconfiguration message, or the like.

[0142] Each form / embodiment described in the present disclosure may also be applied to a mobile communication system using LTE (Long Term Evolution), LTE-A (LTE-Advanced), SUPER3G, IMT-Advanced, 4G (4th generation mobile communication system), 5G (5th generation mobile communication system), 6th generation mobile communication system (6G), xth generation mobile communication system (xG) (xG (x is, for example, an integer or a decimal)), FRA (Future Radio Access), NR (New Radio), New Radio Access (NX), Future Generation Radio Access (FX), W-CDMA (registered trademark), GSM (registered trademark), CDMA2000, UMB (Ultra Mobile Broadband), IEEE 802.11 (Wi-Fi (registered trademark)), IEEE 802.16 (WiMAX (registered trademark)), IEEE At least one of 802.20, UWB (Ultra-WideBand), Bluetooth (registered trademark), other appropriate systems, and next-generation systems that are expanded, modified, created, and specified based on these systems. In addition, a combination of multiple systems (for example, a combination of at least one of LTE and LTE-A and 5G, etc.) may also be applied.

[0143] The processing procedures, timings, and flows of each form / implementation described in this specification may be reversed in order if there is no contradiction. For example, the methods described in this disclosure use the order in which the elements of various steps are presented, but are not limited to the specific order presented.

[0144] In this specification, specific actions performed by the base station 10 are sometimes also performed by its upper node according to the situation. In a network composed of one or more network nodes having the base station 10, various actions performed for communicating with the terminal 20 can be performed by at least one of the base station 10 and other network nodes other than the base station 10 (for example, MME or S-GW, etc., but not limited to these). In the above, the case where there is one other network node other than the base station 10 is illustrated, but the other network node may also be a combination of multiple other network nodes (for example, MME and S-GW).

[0145] The information or signals described in the present disclosure can be output from a higher layer (or a lower layer) to a lower layer (or a higher layer), and can also be input or output via a plurality of network nodes.

[0146] The input or output information can be stored in a specific location (e.g., a memory) or managed using a management table. The input or output information can be rewritten, updated, or appended. The output information can also be deleted. The input information can also be sent to other devices.

[0147] The determination in the present disclosure may be performed by a value represented by 1 bit (0 or 1), by a Boolean value (Boolean: true or false), or by comparison of numerical values ​​(for example, comparison with a predetermined value).

[0148] Software, whether referred to as software, firmware, middleware, microcode, hardware description language, or by other names, shall be interpreted broadly to refer to commands, sets of commands, codes, code segments, program codes, programs, subroutines, software modules, applications, software applications, software packages, routines, subroutines, objects, executable files, execution threads, procedures, functions, etc.

[0149] In addition, software, commands, information, etc. may be sent and received via a transmission medium. For example, when software is sent from a web page, server, or other remote source using at least one of wired technology (coaxial cable, fiber optic cable, twisted pair, digital subscriber line (DSL), etc.) and wireless technology (infrared, microwave, etc.), at least one of these wired technology and wireless technology is included in the definition of transmission medium.

[0150] The information, signals, etc. described in the present disclosure may also be represented by any of a variety of different technologies. For example, the data, commands, instructions, information, signals, bits, symbols, chips, etc. that may be involved in the above description as a whole may be represented by voltage, current, electromagnetic waves, magnetic fields or magnetic particles, light fields or photons, or any combination of these.

[0151] In addition, the terms described in the present disclosure and the terms required for understanding the present disclosure may be replaced with terms having the same or similar meanings. For example, at least one of a channel and a symbol may also be a signal (signaling). In addition, a signal may also be a message. In addition, a component carrier (CC) may also be referred to as a carrier frequency, a cell, a frequency carrier, etc.

[0152] As used in this disclosure, the terms "system" and "network" are used interchangeably.

[0153] In addition, the information, parameters, etc. described in the present disclosure may be represented by absolute values, relative values ​​to predetermined values, or other corresponding information. For example, a wireless resource may be indicated by an index.

[0154] The names used for the above parameters are non-restrictive names in any respect. Furthermore, the formulas etc. using these parameters may sometimes differ from those explicitly disclosed in the present disclosure. Various channels (e.g., PUCCH, PDCCH, etc.) and information elements can be identified by all appropriate names, so the various names assigned to these various channels and information elements are non-restrictive names in any respect.

[0155] In the present disclosure, the terms "base station (BS)," "wireless base station", "base station", "fixed station", "NodeB", "eNodeB (eNB)", "gNodeB (gNB)", "access point", "transmission point", "reception point", "transmission / reception point", "cell", "sector", "cell group", "carrier", "component carrier" and the like are used interchangeably. Sometimes, the base station is also referred to as macro cell, small cell, femto cell, pico cell and the like.

[0156] A base station can accommodate one or more (for example, 3) cells. When a base station accommodates multiple cells, the overall coverage area of ​​the base station can be divided into multiple smaller areas, and each smaller area can also provide communication services through a base station subsystem (for example, a small base station for indoor use (RRH: Remote Radio Head)). Terms such as "cell" or "sector" refer to a part or the entirety of the coverage area of ​​at least one of a base station and a base station subsystem that provide communication services within the coverage area.

[0157] In the present disclosure, the base station sending information to the terminal may be replaced by the base station instructing the terminal to perform control / action based on the information.

[0158] In the present disclosure, terms such as “mobile station (MS)”, “user terminal (user terminal)”, “user equipment (UE)”, and “terminal” may be used interchangeably.

[0159] For mobile stations, those skilled in the art sometimes also use the following terms: 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 terms.

[0160] At least one of the base station and the mobile station may also be referred to as a transmitting device, a receiving device, a communication device, etc. In addition, 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 an object that can move, and the moving speed is arbitrary. In addition, of course, it also includes the situation where the mobile body stops. The mobile body includes, for example, vehicles, transport vehicles, cars, motorcycles, bicycles, networked cars, excavators, bulldozers, wheel loaders, dump trucks, forklifts, trains, buses, two-wheel trailers (rear car), rickshaws, ships (ships and other watercraft: ships and other ships), airplanes, rockets, artificial satellites, Drone (registered trademark), multi-rotor helicopters, quadcopters, balloons and objects mounted on them, and is not limited to this. In addition, the mobile body may also be a mobile body that drives autonomously based on an operation instruction. It can be a means of transportation (such as a car, an airplane, etc.), a mobile body that moves in an unmanned manner (such as a drone, an automatic driving car, etc.), or a robot (man-powered or unmanned). In addition, at least one of the base station and the mobile station also includes a device that does not necessarily move during communication operations. For example, at least one of the base station and the mobile station may be an IoT (Internet of Things) device such as a sensor.

[0161] In addition, the base station in the present disclosure may also be replaced by a user terminal. For example, a structure in which the communication between a base station and a user terminal is replaced by the communication between multiple terminals 20 (for example, it may also be referred to as D2D (Device-to-Device), V2X (Vehicle-to-Everything), etc.) may also apply various forms / implementations of the present disclosure. In this case, it may also be configured that the terminal 20 has the functions possessed by the above-mentioned base station 10. In addition, terms such as "uplink" and "downlink" may also be replaced by terms corresponding to communication between terminals (for example, "side"). For example, uplink channels, downlink channels, etc. may also be replaced by side channels.

[0162] Likewise, the user terminal in the present disclosure may be replaced by a base station. In this case, the base station may have the functions of the user terminal.

[0163] The terms "determining" and "determining" used in this disclosure sometimes include a variety of actions. "Determining" and "determining" may include, for example, considering matters that have been judged, calculated, calculated, processed, derived, investigated, searched (for example, searched in a table, database or other data structure), confirmed (ascertaining) as matters that have been "determined" or "determined", etc. In addition, "determining" and "determining" may include matters that have been received (for example, receiving information), transmitted (for example, transmitting information), input, output, accessed (for example, accessed data in memory) as matters that have been "determined" or "determined", etc. In addition, "determining" and "determining" may include matters that have been resolved (resolving), selected (selecting), chosen (choosing), established (establishing), compared (comparing), etc. as matters that have been "determined" or "determined". That is, "judgment" and "decision" may include certain actions that are considered to be "judged" or "decided". In addition, "judgment (decision)" may also be replaced by "assuming", "expecting", "considering", etc.

[0164] The terms "connected", "coupled" or all variations of these terms are intended to indicate any direct or indirect connection or combination between two or more elements, and may include the situation where there is one or more intermediate elements between two elements that are "connected" or "coupled" to each other. The combination or connection between elements may be a physical combination or connection, a logical combination or connection, or a combination of these. For example, "access" may be used to replace "connection". In the context of the present disclosure, two elements may be considered to be "connected" or "coupled" to each other using at least one of one or more wires, cables, and printed electrical connections, and as some non-limiting and non-inclusive examples, electromagnetic energy having wavelengths in the wireless frequency domain, microwave region, and light (including both visible and invisible) region may be used to "connect" or "couple" to each other.

[0165] The reference signal may be referred to as RS (Reference Signal) for short, or may be referred to as a pilot signal (Pilot) according to the applied standard.

[0166] The phrase “based on” used in the present disclosure does not mean “based only on” unless otherwise explicitly stated. In other words, the phrase “based on” means both “based only on” and “based at least on”.

[0167] Any reference to an element using the designations "first", "second", etc. used in this disclosure does not necessarily limit the number or order of these elements. These designations may be used in this disclosure as a convenient method of distinguishing between two or more elements. Therefore, a reference to a first element and a second element does not mean that only two elements can be used or that the first element must precede the second element in any form.

[0168] The “unit” in the configuration of each of the above-mentioned devices may be replaced with a “section”, “circuit”, “device” or the like.

[0169] When the terms "include", "including" and their variations are used in the present disclosure, these terms are intended to be inclusive, just like the term "comprising". Furthermore, the term "or" used in the present disclosure does not mean an exclusive or.

[0170] A radio frame may be composed of one or more frames in the time domain. In the time domain, one or more frames may be referred to as a subframe. A subframe may also be composed of one or more time slots in the time domain. A subframe may be a fixed time length (e.g., 1 ms) that is independent of a numerology.

[0171] A parameter set may be a communication parameter applied to at least one of the transmission and reception of a certain signal or channel. The parameter set may, for example, represent at least one of subcarrier spacing (SCS), bandwidth, symbol length, cyclic prefix length, transmission time interval (TTI), number of symbols per TTI, radio frame structure, specific filtering processing performed by the transceiver in the frequency domain, specific windowing processing performed by the transceiver in the time domain, and the like.

[0172] A slot may be composed of one or more symbols (OFDM (Orthogonal Frequency Division Multiplexing) symbols, SC-FDMA (Single Carrier Frequency Division Multiple Access) symbols, etc.) in the time domain. A slot may be a time unit based on a parameter set.

[0173] A time slot may contain multiple mini-slots. Each mini-slot may be composed of one or more symbols in the time domain. In addition, a mini-slot may also be referred to as a sub-slot. A mini-slot may be composed of fewer symbols than a time slot. A PDSCH (or PUSCH) transmitted in units of time greater than a mini-slot may be referred to as a PDSCH (or PUSCH) mapping type A. A PDSCH (or PUSCH) transmitted using a mini-slot may be referred to as a PDSCH (or PUSCH) mapping type B.

[0174] A radio frame, a subframe, a time slot, a mini-time slot, and a symbol all represent time units for transmitting signals. A radio frame, a subframe, a time slot, a mini-time slot, and a symbol may be referred to by other corresponding names.

[0175] For example, one subframe may be referred to as a transmission time interval (TTI), multiple consecutive subframes may be referred to as a TTI, and one time slot or one mini time slot may be referred to as a TTI. That is, at least one of a subframe and a TTI may be a subframe (1ms) in existing LTE, a period shorter than 1ms (e.g., 1-13 symbols), or a period longer than 1ms. In addition, the unit representing a TTI may not be referred to as a subframe, but as a time slot, a mini time slot, or the like.

[0176] Here, TTI refers to, for example, the minimum time unit for scheduling in wireless communication. For example, in the LTE system, the base station performs scheduling to allocate wireless resources (frequency bandwidth, transmission power, etc. that can be used in each terminal 20) to each terminal 20 in units of TTI. In addition, the definition of TTI is not limited to this.

[0177] TTI can be a transmission time unit of data packets (transport blocks), code blocks, code words, etc. after channel coding, or a processing unit such as scheduling and link adaptation. In addition, when TTI is given, the time interval (e.g., the number of symbols) to which the transport block, code block, code word, etc. is actually mapped can be shorter than the TTI.

[0178] In addition, when one time slot or one mini time slot is called TTI, one or more TTIs (i.e., one or more time slots or one or more mini time slots) can be the minimum time unit for scheduling. In addition, the number of time slots (mini time slots) constituting the minimum time unit for scheduling can be controlled.

[0179] A TTI with a time length of 1 ms is also called a normal TTI (TTI in LTE Rel.8-12), a normal TTI, a long TTI, a normal subframe, a normal subframe, a long subframe, a time slot, etc. 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-time slot, a sub-time slot, a time slot, etc.

[0180] In addition, for a long TTI (for example, a normal TTI, a subframe, etc.), it can be replaced with a TTI having a time length exceeding 1ms, and for a short TTI (for example, a shortened TTI, etc.), it can be replaced with a TTI having a TTI length smaller than the long TTI (longTTI) and greater than 1ms.

[0181] A resource block (RB) is a resource allocation unit in the time domain and the frequency domain. In the frequency domain, it may include one or more consecutive subcarriers. The number of subcarriers included in an RB may be the same regardless of the parameter set, for example, it may be 12. The number of subcarriers included in an RB may also be determined based on the parameter set.

[0182] In addition, the time domain of an RB may include one or more symbols, and may be the length of one slot, one mini slot, one subframe, or one TTI. One TTI, one subframe, etc. may be composed of one or more resource blocks, respectively.

[0183] In addition, one or more RBs may also be referred to as a physical resource block (PRB: Physical RB), a sub-carrier group (SCG: Sub-Carrier Group), a resource element group (REG: Resource Element Group), a PRB pair, an RB pair, etc.

[0184] In addition, a resource block may be composed of one or more resource elements (REs). For example, one RE may be a radio resource region of one subcarrier and one symbol.

[0185] A bandwidth part (BWP) (also referred to as partial bandwidth, etc.) may also represent a subset of contiguous common RBs (common resource blocks) for a parameter set in a carrier. Here, the common RBs may be identified by the index of the RBs relative to the common reference point of the carrier. PRBs may be defined in a BWP and numbered within the BWP.

[0186] The BWP may include a BWP for UL (UL BWP) and a BWP for DL ​​(DL BWP). One or more BWPs may be configured for the terminal 20 within one carrier.

[0187] At least one of the set BWPs may be active, and it is not assumed that the terminal 20 transmits and receives a predetermined signal / channel outside the activated BWP. In addition, "cell", "carrier" and the like in the present disclosure may be replaced with "BWP".

[0188] The above structures of radio frames, subframes, time slots, mini-time slots, and symbols are merely examples. For example, the number of subframes included in a radio frame, the number of time slots per subframe or radio frame, the number of mini-time slots included in a time slot, the number of symbols and RBs included in a time slot or mini-time slot, the number of subcarriers included in an RB, the number of symbols in a TTI, the symbol length, and the cyclic prefix (CP) length may be changed in various ways.

[0189] In the present disclosure, when an article is added by translation, such as a, an, and the in English, for example, the present disclosure also includes a case where the noun following the article is in a plural form.

[0190] In the present disclosure, the term "A and B are different" may mean "A and B are different from each other". In addition, the term may mean "A and B are different from C, respectively". The terms "separate" and "combined" may also be interpreted in the same way as "different".

[0191] Each form / implementation described in the present disclosure may be used alone or in combination, and may be switched depending on the execution. In addition, notification of predetermined information (e.g., notification of "yes X") is not limited to being performed explicitly, but may also be performed implicitly (e.g., not notifying the predetermined information).

[0192] The present disclosure is described in detail above, but it should be clear to those skilled in the art that the present disclosure is not limited to the embodiments described in the present disclosure. The present disclosure can be implemented as a modification and variation without departing from the subject matter and scope of the present disclosure as determined by the claims. Therefore, the purpose of the description of the present disclosure is to illustrate and not to have any limiting meaning on the present disclosure.

[0193] Description of symbols

[0194] 10: Base Station (RAN)

[0195] 11-1: First MN

[0196] 11-2: Second MN

[0197] 11-3: Third MN

[0198] 110: Sending Department

[0199] 120: Receiving Department

[0200] 130: Setting department

[0201] 140: Control Department

[0202] 20: Terminal

[0203] 20-1: First UE

[0204] 20-2: Second UE

[0205] 20-3: The third UE

[0206] 30: Core Network

[0207] 40: DN

[0208] 210: Sending Department

[0209] 220: Receiving Department

[0210] 230: Setting department

[0211] 240: Control Department

[0212] 310-1: First AMF

[0213] 310-2: Second AMF

[0214] 310-3: Third AMF

[0215] 320: UDM

[0216] 330:NEF

[0217] 340: NRF

[0218] 350: AUSF

[0219] 360: PCF

[0220] 370: SMF

[0221] 380:UPF

[0222] 390:AF

[0223] 1001: Processor

[0224] 1002: Storage device

[0225] 1003: Auxiliary storage device

[0226] 1004: Communication device

[0227] 1005: Input device

[0228] 1006: Output device

[0229] 2001: Vehicles

[0230] 2002: Drive Department

[0231] 2003: Steering

[0232] 2004: Accelerator pedal

[0233] 2005: Brake pedal

[0234] 2006: Gear Lever

[0235] 2007: Front wheel

[0236] 2008: Rear wheel

[0237] 2009: Axles

[0238] 2010: Electronic Control Department

[0239] 2012: Information Services Department

[0240] 2013: Communication Module

[0241] 2021: Current Sensors

[0242] 2022: Speed ​​Sensor

[0243] 2023: Barometric pressure sensor

[0244] 2024: Vehicle speed sensor

[0245] 2025: Accelerometers

[0246] 2026: Brake pedal sensor

[0247] 2027: Gearshift sensor

[0248] 2028: Object detection sensors

[0249] 2029: Accelerator pedal sensor

[0250] 2030: Driving Assistance Systems Division

[0251] 2031: Microprocessors

[0252] 2032: Memory (ROM, RAM)

[0253] 2033: Communication port (IO port)

Claims

1. A network node, comprising: a receiving unit, which receives a registration request from a terminal; a control unit that obtains registration information of a network node that controls registration of a terminal belonging to a group including the terminal, and determines, based on the registration information, whether a master node passed through in the registration request is a master node different from that of other terminals belonging to the group; and A sending unit sends a registration request including an identifier identifying the master node to a network node that manages subscribers of the terminal, if the master node is different from other terminals belonging to the group.

2. The network node according to claim 1, in, The sending unit sends a subscription request for notifying that a registration request of the other terminal belonging to the group has been received to a network node that manages subscribers of the other terminal belonging to the group. The receiving unit receives, based on the subscription, registration information indicating a registered network node from a network node that manages subscribers of other terminals belonging to the group.

3. The network node according to claim 1, in, The control unit selects a network node that is not used by other terminals belonging to the group as a network node to be a reallocation destination based on the registration information.

4. The network node according to claim 1, in, The receiving unit receives a handover request accompanying movement of the terminal, The control unit selects a network node that is not used by other terminals belonging to the group as a network node to be a movement destination based on the registration information.

5. A wireless communication system comprising a plurality of network nodes for controlling registration of a terminal and a plurality of master nodes for wirelessly communicating with the terminal, in, The plurality of network nodes respectively include: A receiving unit, which receives a registration request from the terminal; a control unit that obtains registration information of a network node that controls registration of a terminal belonging to a group including the terminal, and determines, based on the registration information, whether a master node passed through in the registration request is a master node different from that of other terminals belonging to the group; as well as A sending unit sends a registration request including an identifier identifying the master node to a network node that manages subscribers of the terminal, if the master node is different from other terminals belonging to the group.

6. A communication method, which is performed by a network node and comprises the following steps: receiving a registration request from a terminal; obtaining registration information of a network node that controls registration of a terminal belonging to a group including the terminal, and determining, based on the registration information, whether a master node passed through in the registration request is a master node different from that of other terminals belonging to the group; and In the case of a master node different from other terminals belonging to the group, a registration request including an identifier identifying the master node is sent to a network node that manages subscribers of the terminal.

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