Network node, terminal, and communication method

Abstract

This network node comprises: a reception unit that receives, from a first node, setting information including a first period, which is a period in which a terminal sends notification of position registration information, the number of consecutive notifications, in which the same position registration information is notified in a consecutive manner, the number being a condition for changing the period, and a second period, which is a changed period; a control unit that sets the setting information; a reception unit that receives, from the terminal, a notification message including the position registration information; and a transmission unit that, when requesting the terminal to change the period, transmits a request message including information on the changed period to the terminal, wherein the values of the first period, the second period, and the number of consecutive notifications are values calculated for the terminal on the basis of the notification message about the position registration information transmitted in the past by the terminal, and when the number of times of consecutive receptions of notification messages including the same position registration information by the reception unit is equal to the number of consecutive notifications, the control unit changes the period from the first period to the second period, and the transmission unit transmits a request message including information about the second period to the terminal.

Description

Network node, terminal, and communication method

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

[0002] 3GPP (registered trademark) (3rd Generation Partnership Project) is currently studying a wireless communication system called 5G or NR (New Radio) (hereinafter, the wireless communication system will be referred to as "5G" or "NR") in order to achieve a larger system capacity, a higher data transmission speed, and a lower latency in wireless sections. Various wireless technologies are being studied for 5G to meet the requirements of achieving a throughput of 10 Gbps or more while keeping latency in wireless sections to 1 ms or less.

[0003] In NR, a network architecture including 5GC (5G Core Network) or 5GS (5G System) corresponding to EPC (Evolved Packet Core), which is the core network in the network architecture of LTE (Long Term Evolution), and NG-RAN (Next Generation - Radio Access Network) corresponding to E-UTRAN (Evolved Universal Terrestrial Radio Access Network), which is the RAN (Radio Access Network) in the network architecture of LTE, is being considered (for example, Non-Patent Document 1).

[0004] 5GS also supports AI (Artificial Intelligence) and machine learning technologies to support intelligent network automation. The NWDAF (Network Data Analytics Function) collects data from data sources such as the NF (Network Function), AF (Application Function), and OAM (Operations, Administration, and Maintenance), analyzes the network data based on the input data, and provides the analysis results (see, for example, Non-Patent Document 2).

[0005] 3GPP TS 23.501 V18.3.0 (2023-09) 3GPP TS 23.228 V18.3.0 (2023-09)

[0006] In order to periodically register location registration information, a terminal notifies the network of the location registration information. Under existing specifications, even if the terminal is not moving, the terminal must periodically notify the network of the same location registration information, which is inefficient in terms of terminal power consumption and network communication volume.

[0007] The present invention has been made in view of the above points, and has as its object to reduce the frequency of notifications relating to location registration information from terminals in a communication system.

[0008] According to the disclosed technology, there is provided a network node having: a receiving unit that receives from a first network node configuration information including information on at least one of a first period, which is a period at which a terminal notifies location registration information; a number of consecutive notifications, which are conditions for changing the period, which are the number of consecutive notifications at which the same location registration information is notified consecutively; and a second period, which is the period after the change; a control unit that sets the configuration information; a receiving unit that receives from the terminal a notification message including the location registration information; and a transmitting unit that, when requesting the terminal to change the period, transmits to the terminal a request message including information on the changed period, wherein a value of at least one of the first period, the second period, and the number of consecutive notifications is a value calculated for the terminal based on a notification message notifying location registration information that was previously transmitted by the terminal; and when the number of consecutive times that the receiver has received notification messages including the same location registration information matches the number of consecutive notifications, the control unit changes the period from the first period to the second period, and the transmitting unit transmits to the terminal a request message including information related to the second period.

[0009] According to the disclosed technology, it is possible to reduce the frequency of notifications related to location registration information from terminals in a communication system.

[0010] FIG. 1 is a diagram for explaining an example of a communication system. FIG. 1 is a diagram for explaining an example of a communication system in a roaming environment. FIG. 2 is a diagram for explaining a state transition model of a terminal in 5GS. FIG. 3 is a diagram for explaining an overview of a first example of an embodiment of the present invention. FIG. 4 is a diagram for explaining an example of a sequence diagram related to a change of a period in the first example of an embodiment of the present invention. FIG. 5 is a diagram for explaining an overview of a second example of an embodiment of the present invention. FIG. 6 is a diagram for explaining an example of a sequence diagram related to a change of a period in the second example of an embodiment of the present invention. FIG. 7 is a diagram for explaining an example of a sequence diagram related to a change of a period in the second example of an embodiment of the present invention. FIG. 8 is a diagram for explaining an example of a sequence diagram related to a change of a period in the second example of an embodiment of the present invention.

[0011] Hereinafter, an embodiment of the present invention will be described with reference to the drawings. Note that the embodiment described below is an example, and the embodiment to which the present invention is applied is not limited to the following embodiment.

[0012] In the operation of the wireless communication system according to the embodiment of the present invention, existing technology is used as appropriate. However, the existing technology is, for example, the existing LTE, but is not limited to the existing LTE. Furthermore, the term "LTE" used in this specification has a broad meaning including LTE-Advanced, and systems subsequent to LTE-Advanced (e.g., NR), or wireless LAN (Local Area Network), unless otherwise specified.

[0013] Furthermore, in the embodiments of the present invention, "configuring" radio parameters and the like may mean that predetermined values ​​are pre-configured, or that radio parameters notified from the network node 30 or the terminal 20 are set.

[0014] Fig. 1 is a diagram illustrating an example of a communication system. As shown in Fig. 1, the communication system is composed of a UE, which is a terminal 20, and multiple network nodes 30. Hereinafter, it is assumed that one network node 30 corresponds to each function, but multiple functions may be realized by one network node 30, or multiple network nodes 30 may realize one function. Furthermore, the "connection" described below may be a logical connection or a physical connection.

[0015] The RAN (Radio Access Network) is a network node 30 having a radio access function, which may include a base station 10, and is connected to a UE, an AMF (Access and Mobility Management Function), and a UPF (User plane function). The AMF is a network node 30 having functions such as terminating the RAN interface, terminating the NAS (Non-Access Stratum), registration management, connection management, reachability management, and mobility management. The UPF is a network node 30 having functions such as a PDU (Protocol Data Unit) session point to the outside that interconnects with a DN (Data Network), packet routing and forwarding, and user plane QoS (Quality of Service) handling. The UPF and the DN constitute a network slice. In the wireless communication network according to the embodiment of the present invention, multiple network slices are constructed.

[0016] The AMF is connected to the UE, RAN, SMF (Session Management function), NSSF (Network Slice Selection Function), NEF (Network Exposure Function), NRF (Network Repository Function), UDM (Unified Data Management), AUSF (Authentication Server Function), PCF (Policy Control Function), and AF (Application Function). The AMF, SMF, NSSF, NEF, NRF, UDM, AUSF, PCF, and AF are network nodes 30 that are mutually connected via interfaces based on their respective services, Namf, Nsmf, Nnssf, Nnef, Nnrf, Nudm, Nausf, Npcf, and Naf.

[0017] The SMF is a network node 30 having functions such as session management, UE IP (Internet Protocol) address allocation and management, DHCP (Dynamic Host Configuration Protocol) function, ARP (Address Resolution Protocol) proxy, and roaming function. The NEF is a network node 30 having a function of notifying other NFs (Network Functions) of capabilities and events. The NSSF is a network node 30 having functions such as selecting a network slice to which a UE connects, determining an allowed NSSAI (Network Slice Selection Assistance Information), determining an NSSAI to be set, and determining an AMF set to which a UE connects. The PCF is a network node 30 having a function of controlling network policies. The AF is a network node 30 having a function of controlling application servers. The NRF is a network node 30 having a function of discovering NF instances that provide services. The UDM is a network node 30 that manages subscriber data and authentication data. The UDM is connected to a UDR (User Data Repository) that stores the data.

[0018] Fig. 2 is a diagram illustrating an example of a communication system in a roaming environment. As shown in Fig. 2, the network is composed of a UE, which is a terminal 20, and multiple network nodes 30. Hereinafter, it is assumed that one network node 30 corresponds to each function, but multiple functions may be realized by one network node 30, or multiple network nodes 30 may realize one function. Furthermore, the "connection" described below may be a logical connection or a physical connection.

[0019] The RAN is a network node 30 having a radio access function, and is connected to the UE, the AMF, and the UPF. The AMF is a network node 30 having functions such as RAN interface termination, NAS termination, registration management, connection management, reachability management, and mobility management. The UPF is a network node 30 having functions such as a PDU session point to the outside that interconnects with the DN, packet routing and forwarding, and user plane QoS handling. The UPF and the DN constitute a network slice. In the wireless communication network according to the embodiment of the present invention, multiple network slices are constructed.

[0020] The AMF is connected to the UE, RAN, SMF, NSSF, NEF, NRF, UDM, AUSF, PCF, AF, and SEPP (Security Edge Protection Proxy). The AMF, SMF, NSSF, NEF, NRF, UDM, AUSF, PCF, and AF are network nodes 30 that are interconnected via respective service-based interfaces, Namf, Nsmf, Nnssf, Nnef, Nnrf, Nudm, Nausf, Npcf, and Naf.

[0021] The SMF is a network node 30 having functions such as session management, UE IP address allocation and management, DHCP function, ARP proxy, and roaming function. The NEF is a network node 30 having a function of notifying other NFs of capabilities and events. The NSSF is a network node 30 having functions such as selecting a network slice to which a UE connects, determining an allowed NSSAI, determining a configured NSSAI, and determining an AMF set to which a UE connects. The PCF is a network node 30 having a function of controlling network policies. The AF is a network node 30 having a function of controlling application servers. The NRF is a network node 30 having a function of discovering NF instances that provide services. The SEPP is a non-transparent proxy that filters control plane messages between PLMNs (Public Land Mobile Networks). The vSEPP shown in FIG. 2 is a SEPP in the visited network, and the hSEPP is a SEPP in the home network.

[0022] As shown in Figure 2, a UE is in a roaming environment connected to a RAN and an AMF in a Visited PLMN (VPLMN). The VPLMN and a Home PLMN (HPLMN) are connected via a vSEPP and an hSEPP. The UE can communicate with a UDM in the HPLMN via the AMF in the VPLMN, for example.

[0023] FIG. 3 is a diagram for explaining a terminal state transition model in 5GS. As shown in FIG. 3, the terminal 20 transitions between three states: State 11, State 12, and State 13. State 11 is a state in which the terminal 20 is registered in the network. State 12 is a state in which the terminal 20 is not registered in the network. State 13 is a state in which the terminal 20 is registered in the network but is not connected to the core network (CM-IDLE), and the N1 NAS connection is disconnected. Therefore, no communication is performed between the terminal 20 and the AMF, and the terminal 20 periodically notifies the terminal 20 of location registration information. The period for performing this notification is managed by a timer value specified by the AMF. Furthermore, a cell identifier or the like for identifying the base station 10 is used as the location registration information. Note that the location registration information may also be referred to as location information.

[0024] <First Example> A first example will be described, which includes a procedure for reducing the frequency of notifications related to location registration information by a terminal 20 in a communication system. In this example, messages related to location registration processing are transmitted and received between the terminal 20 and a network node 30A via a base station 10. Here, the network node 30A is, for example, an AMF.

[0025] Furthermore, in this embodiment, when the same location information is reported a predetermined number of times (e.g., N times) consecutively during periodic location registration by the terminal 20, the network node 30A sets a longer location registration period. That is, the network node 30A sets, as setting information related to the predetermined periodic location registration, the number of times the same location information is reported consecutively (hereinafter referred to as the number of consecutive notifications) and a period (hereinafter referred to as period information) that is set to a value longer than the current period. Here, with regard to the period information, the period before change may be T (unit: time, for example; the same applies hereinafter) and the period after change may be T+A, and the period information may include two values, T and A, or may include two values, T and T+A. Alternatively, T may be information commonly set for all terminals, and only one value, T or T+A, may be used as period information for each terminal.

[0026] Furthermore, some or all of the number of consecutive notifications and the periodicity information in the setting information may be calculated for each terminal 20 using technology such as AI (Artificial Intelligence) or a machine learning model. This calculation is performed, for example, by collecting periodic location information previously notified by the terminal 20 and inputting the collected data into an AI or machine learning model. The setting information calculated for each different terminal is stored in the network node 30B, which is a Consumer. Here, the network node 30B is, for example, a Network Data Analytics Function (NWDAF). Alternatively, the network node 30B may collect periodic location information and / or calculate the setting information.

[0027] 4 is a diagram for explaining an outline of the first embodiment of the present invention. The processing of each step in FIG. 4 will be explained below.

[0028] S100: The network node 30B notifies the network node 30A of the setting information (the number of consecutive notifications (N) and change information) calculated for the terminal 20 and related to periodic location registration.

[0029] S101: The network node 30A detects that the location registration information notified from the terminal 20 is the same N times in a row. Here, as a condition for changing the period of notification related to the location registration information, a number of times, such as N=3, is set in advance.

[0030] S102: The network node 30A determines to change the period of notification related to the location registration information (to lengthen the period), and requests the terminal 20 to make the change.

[0031] S103: The terminal 20 changes the period of notification related to the location registration information (lengthens the period) based on the request from the network node 30A.

[0032] As described above, when the network node 30A receives notifications relating to the same location registration information from the terminal 20 a predetermined number of times in succession, the network node 30A changes the period of notifications relating to the location registration information (lengthens the period).

[0033] Next, the process for changing the period in Example 1 will be described in detail. Fig. 5 is a diagram showing an example of a sequence diagram for changing the period in Example 1 of the embodiment of the present invention. The process for each step in Fig. 5 will be described below.

[0034] S110: The network node 30B notifies the network node 30A of the setting information (the number of consecutive notifications (N) and the change period) related to periodic location registration calculated for the terminal 20. Here, other methods for notifying the setting information will be described. The network node 30B may notify the network node 30A of the setting information at a predetermined period or irregularly (for example, when the setting information is updated). Alternatively, the network node 30B may notify the network node 30A of the setting information in response to a request received from the network node 30A. Here, the network node 30A may specify the terminal 20 that requires the setting information by using a terminal identifier or the like. Furthermore, if the setting information for the terminal 20 has not been calculated, the network node 30A may notify the network node 30A of a predetermined value of the setting information (such as a default value).

[0035] S111: Based on the setting information notified in S110, the network node 30A sets the period (e.g., T time) at which the terminal 20 notifies the location registration information, and as conditions for changing the period, the number of times the same location registration information is notified consecutively (e.g., N times), and the changed period (e.g., T+A time).

[0036] S112: The terminal 20 transmits a notification message to the network node 30A to register location registration information. Here, the terminal 20 transmits the notification message containing the same location registration information N times in succession. It is assumed that the terminal 20 has set an initial value for the period for notifying the location registration information.

[0037] S113: The network node 30A detects that it has received, from the terminal 20, a notification message for registering location registration information containing the same location registration information N times in succession.

[0038] S114: The network node 30A decides to change the interval for notifying the location registration information to a longer interval (for example, T+A time), and sets the changed interval.

[0039] S115: The network node 30A transmits to the terminal 20 a change request message for the cycle that includes information about the cycle that was changed in S114.

[0040] S116: The terminal 20 executes the setting for changing the period for notifying the location registration information based on the information about the period received in S115.

[0041] Next, a process for canceling the change in the period for notifying location registration information after the period has been changed will be described. Fig. 6 is a diagram showing an example of a sequence diagram relating to canceling the change in the period in the first embodiment of the present invention. The process of each step in Fig. 6 will be described below.

[0042] S121: The terminal 20 transmits a notification message for registering location registration information to the network node 30A. Here, the location registration information included in the notification message differs from the location registration information included in the notification message received in S112 of Fig. 5 due to the terminal 20 having moved.

[0043] S122: The network node 30A detects that the location registration information included in the notification message received in S121 is different from the location registration information included in the notification message received in S112 of FIG. 5 (when the period has been changed).

[0044] S123: The network node 30A cancels the change of the changed period. That is, the network node 30A changes the period (T+A time) changed in S114 of Fig. 5 back to the period before the change (T time).

[0045] S124: The network node 30A transmits to the terminal 20 a change request message for the cycle changed in S123, the change request message including information about the cycle.

[0046] S125: The terminal 20 executes the setting for changing the period for notifying the location registration information based on the information about the period received in S124.

[0047] Second Example A second example will be described, which includes a procedure for reducing the frequency of notifications related to location registration information by a terminal 20 in a communication system. In this example, messages related to location registration processing are transmitted and received between the terminal 20 and a network node 30A via a base station 10. Here, the network node 30A is, for example, an AMF.

[0048] Furthermore, in this embodiment, when the same location information is reported a predetermined number of times (e.g., N times) consecutively during periodic location registration by the terminal 20, the network node 30A sets a longer location registration period. That is, the network node 30A sets, as setting information related to the predetermined periodic location registration, the number of times the same location information is reported consecutively (hereinafter referred to as the number of consecutive notifications) and a period (hereinafter referred to as period information) that is set to a value longer than the current period. Here, with regard to the period information, the period before change may be T (unit: time, for example; the same applies hereinafter) and the period after change may be T+A, and the period information may include two values, T and A, or may include two values, T and T+A. Alternatively, T may be information commonly set for all terminals, and only one value, T or T+A, may be used as period information for each terminal.

[0049] Furthermore, some or all of the number of consecutive notifications and the periodicity information in the setting information may be calculated for each terminal 20 using technology such as AI (Artificial Intelligence) or a machine learning model. This calculation is performed, for example, by collecting periodic location information previously notified by the terminal 20 and inputting the collected data into an AI or machine learning model. The setting information calculated for each different terminal is stored in the network node 30B, which is a Consumer. Here, the network node 30B is, for example, a Network Data Analytics Function (NWDAF). Alternatively, the network node 30B may collect periodic location information and / or calculate the setting information.

[0050] 7 is a diagram for explaining an outline of the second embodiment of the present invention. The processing of each step in FIG. 7 will be explained below.

[0051] S200: The network node 30B notifies the terminal 20 of the setting information (the number of consecutive notifications (N) and change information) related to periodic location registration calculated for the terminal 20.

[0052] S201: The terminal 20 detects that the location registration information notified to the network node 30A is the same N times in a row. Here, as a condition for changing the period of notification related to the location registration information, for example, N=3 times is set in advance.

[0053] S202: Based on the detection result in S201, the terminal 20 changes the period of notification relating to the location registration information (lengthens the period).

[0054] S203: The terminal 20 requests the network node 30A to change the period of notification related to the location registration information.

[0055] S204: The network node 30A changes the period of notification relating to the location registration information (lengthens the period) based on the request received from the terminal 20 in S203.

[0056] As described above, when the terminal 20 performs a predetermined number of consecutive notifications related to the same location registration information, it changes the period for notifying the location registration information (lengthens the period) and further requests the network node 30 to make the change.

[0057] Next, the process for changing the period in the second embodiment will be described in detail. Fig. 8 is a diagram showing an example of a sequence diagram for changing the period in the second embodiment of the present invention. The process of each step in Fig. 8 will be described below.

[0058] S210: The network node 30B notifies the terminal 20 of configuration information (the number of consecutive notifications (N) and change information) related to periodic location registration calculated for the terminal 20. Alternatively, the network node 30B may transmit the configuration information to the network node 30A, and the network node 30A may notify the terminal 20 of the configuration information. Alternatively, in a registration procedure of the terminal 20 to the network, for example, the AMF may notify the terminal 20 of the configuration information.

[0059] S211: The terminal 20 sets a period (e.g., T time) for notifying the location registration information and, as a condition for changing the period, the number of times (e.g., N times) for notifying the same location registration information consecutively.

[0060] S212: The terminal 20 transmits a notification message for registering location registration information to the network node 30 A. Here, the terminal 20 transmits the notification message including the same location registration information N times in succession.

[0061] S213: The terminal 20 detects that it has transmitted, to the network node 30A, a notification message for registering location registration information containing the same location registration information N times in succession.

[0062] S214: The terminal 20 determines to change the interval for reporting the location registration information to a longer interval (for example, T+A time), and sets the changed interval.

[0063] S215: The terminal 20 transmits to the network node 30A a period change request message including information about the period changed in S214.

[0064] S216: The network node 30A executes settings to change the period for notifying the location registration information based on the information about the period received in S215.

[0065] S217: The network node 30A transmits to the terminal 20 a notification message notifying that the change in the period for reporting the location registration information has been completed.

[0066] Next, a process for canceling the change in the period for notifying location registration information after the period has been changed will be described. Fig. 9 is a diagram showing an example of a sequence diagram relating to canceling the change in the period in the second example of the embodiment of the present invention. The process of each step in Fig. 9 will be described below.

[0067] S221: The terminal 20 transmits a notification message for registering location registration information to the network node 30A. Here, the location registration information included in the notification message differs from the location registration information included in the notification message received in S212 of Fig. 8 due to the terminal 20 having moved.

[0068] S222: The terminal 20 detects that the location registration information included in the notification message sent in S221 is different from the location registration information included in the notification message received in S212 of FIG. 8 (when the cycle has been changed).

[0069] S223: The terminal 20 cancels the change of the changed period. That is, the network node 30 changes the period (T+A time) changed in S214 of Fig. 8 back to the period before the change (T time).

[0070] S224: The terminal 20 transmits to the network node 30A a change request message for the cycle that includes information about the cycle that was changed in S223.

[0071] S225: The network node 30A executes settings to change the period for notifying the location registration information based on the information about the period received in S224.

[0072] S226: The network node 30A transmits to the terminal 20 a notification message notifying that the change in the period for reporting the location registration information has been completed.

[0073] <Method of Changing the Notification Cycle of Location Registration Information> A method of changing (lengthening) the notification cycle of location registration information in S114 of FIG. 5 in the first embodiment or S214 of FIG. 8 in the second embodiment will be described.

[0074] Note that the values ​​relating to the periodic change described below may be included in the setting information relating to periodic location registration, calculated using the AI ​​or machine learning model mentioned above, or the like.

[0075] In a first method, a time obtained by adding a predetermined time (time A) to the period before the change (time T) is set as the changed period (time T+A).

[0076] As a second method, the period before the change (time T) is multiplied by a predetermined magnification (time B) to obtain the period after the change (time T×B).

[0077] As a third method, first, the terminal 20 and the network node 30A share in advance information regarding a list containing multiple period values. The list has P values ​​assigned with indices from 1 to P, such as {T(1), T(2), ..., T(P)}, where the larger the index value, the longer the period. The terminal 20 and the network node 30A notify each other of the index values ​​of the list, thereby setting the initial value and changed value of the period.

[0078] <First Modification> A first modification of the above-described embodiment will be described. In the first modification, the terminal 20 or the network node 30A sets the duration for which the same location registration information is notified as a change condition for changing the period, and changes the period for notifying the location registration information based on the duration (lengthens the period). For example, the terminal 20 or the network node 30A changes the period (lengthens the period) if the product of the number of times the same location registration information has been notified minus 1 and the notification period is equal to or exceeds the duration. In other words, if the terminal 20 or the network node 30A has notified the same location registration information N consecutive times, it estimates that the same location registration information has continued for the time indicated by the product of (N-1) and the period.

[0079] <Second Modification> A second modification of the above-described embodiment will be described. In the second modification, the terminal 20 or the network node 30A repeatedly changes the period of notification of location registration information (lengthens the period). For example, the terminal 20 or the network node 30A receives the same location registration information N times in succession and changes the period, and then changes the period again if the terminal 20 or the network node 30A receives the same location registration information N times in succession. Furthermore, a maximum value for the period to be changed, or a maximum value for the duration described in the first modification, may be set, and the period may be changed until the set maximum value is reached.

[0080] <Third Modification> A third modification of the above-described embodiment will be described. In the third modification, the terminal 20 or the network node 30A assumes the same setting values ​​and method for the process related to changing the cycle of reporting location registration information, and executes the setting process related to the cycle change (S114 and S116 in FIG. 5 in the first embodiment, or S214 and S216 in FIG. 8 in the second embodiment) without executing the transmission of the cycle change request (S115 in FIG. 5 in the first embodiment, or S215 in FIG. 8 in the second embodiment) and the cycle change completion notification (S217 in FIG. 8 in the second embodiment). The same can also be applied to the cancellation of the cycle change described in FIGS. 6 and 9. This makes it possible to further reduce the amount of information transmitted to the network.

[0081] The above-described embodiment makes it possible to reduce the frequency of notifications related to location registration information from terminals in a communication system. Therefore, from the viewpoint of power efficiency, it is possible to reduce battery consumption in terminals. Furthermore, from the viewpoint of network resilience, it is possible to prevent congestion and improve network resilience by reducing unnecessary information transmission.

[0082] (Device Configuration) Next, a description will be given of an example of the functional configuration of the base station 10, network node 30 (a collective term including network node 30A and network node 30B, the same applies hereinafter), and terminal 20 that perform the processes and operations described above. The base station 10, network node 30, and terminal 20 include functions for performing the above-described embodiments. However, the base station 10, network node 30, and terminal 20 may each be equipped with only a part of the functions of the embodiments.

[0083] <Base Station 10 and Network Node 30> Fig. 10 is a diagram showing an example of the functional configuration of the base station 10 and the network node 30. As shown in Fig. 10, the base station 10 has a transmitting unit 110, a receiving unit 120, a setting unit 130, and a control unit 140. The functional configuration shown in Fig. 10 is merely an example. As long as the operations according to the embodiment of the present invention can be performed, the names of the functional divisions and functional units may be any. Note that the network node 30 may have the same functional configuration as the base station 10. Furthermore, a network node 30 having multiple different functions in the system architecture may be composed of multiple network nodes 30 separated by function.

[0084] The transmitter 110 includes a function of generating a signal to be transmitted to the terminal 20 or another network node 30 and transmitting the signal by wire or wirelessly. The receiver 120 includes a function of receiving various signals transmitted from the terminal 20 or another network node 30 and acquiring, for example, information of a higher layer from the received signal. A communication unit including the transmitter 110 and the receiver 120 may be configured.

[0085] The setting unit 130 stores preset setting information and various setting information to be transmitted to the terminal 20 in a storage device, and reads out the information from the storage device as needed.

[0086] As described in the embodiment, the control unit 140 performs processing related to reducing the frequency of reporting location registration information. The control unit 140 also performs processing related to communication with the terminal 20. A functional unit related to signal transmission in the control unit 140 may be included in the transmitting unit 110, and a functional unit related to signal reception in the control unit 140 may be included in the receiving unit 120.

[0087] <Terminal 20> Fig. 11 is a diagram showing an example of the functional configuration of the terminal 20. As shown in Fig. 11, the terminal 20 has a transmitting unit 210, a receiving unit 220, a setting unit 230, and a control unit 240. The functional configuration shown in Fig. 11 is merely an example. As long as the operations related to the embodiment of the present invention can be performed, the names of the functional divisions and functional units may be any. In addition, the communication device that becomes the resource holder may have the same functional configuration as the terminal 20.

[0088] The transmitter 210 creates a transmission signal from transmission data and transmits the transmission signal wirelessly. The receiver 220 receives various signals wirelessly and acquires higher layer signals from the received physical layer signals. The receiver 220 also has a function of receiving NR-PSS, NR-SSS, NR-PBCH, DL / UL control signals, reference signals, and the like transmitted from the network node 30. A communication unit including the transmitter 210 and the receiver 220 may be configured.

[0089] The setting unit 230 stores various pieces of setting information received from the network node 30 by the receiving unit 220 in a storage device, and reads them out from the storage device as needed. The setting unit 230 also stores setting information that is set in advance.

[0090] As described in the embodiment, the control unit 240 performs processing related to reducing the frequency of reporting location registration information. A functional unit related to signal transmission in the control unit 240 may be included in the transmitting unit 210, and a functional unit related to signal reception in the control unit 240 may be included in the receiving unit 220.

[0091] (Hardware Configuration) The block diagrams (FIGS. 10 and 11) used to explain the above embodiments show functional blocks. These functional blocks (components) are realized by any combination of at least one of hardware and software. Furthermore, the method for realizing each functional block is not particularly limited. That is, each functional block may be realized using a single device that is physically or logically coupled, or may be realized using two or more physically or logically separated devices that are directly or indirectly connected (for example, using wires, wirelessly, etc.) and these multiple devices. The functional block may be realized by combining software with the single device or the multiple devices.

[0092] Functions include, but are not limited to, judgment, determination, assessment, calculation, computation, processing, derivation, investigation, search, confirmation, reception, transmission, output, access, resolution, selection, selection, establishment, comparison, assumption, expectation, consideration, broadcasting, notifying, communicating, forwarding, configuring, reconfiguring, allocating, mapping, and assignment. For example, a functional block (component) that performs transmission is called a transmitting unit or transmitter. As mentioned above, there are no particular limitations on how these functions are implemented.

[0093] For example, the network node 30, the terminal 20, etc. according to an embodiment of the present disclosure may function as a computer that performs processing of the wireless communication method of the present disclosure. Fig. 12 is a diagram illustrating an example of the hardware configuration of the base station 10 and the terminal 20 according to an embodiment of the present disclosure. The network node 30 may have the same hardware configuration as the base station 10. The above-described base station 10 and the terminal 20 may be physically configured as a computer device including a processor 1001, a storage device 1002, an auxiliary storage device 1003, a communication device 1004, an input device 1005, an output device 1006, a bus 1007, etc.

[0094] In the following description, the term "apparatus" can be interpreted as a circuit, a device, a unit, etc. The hardware configuration of the base station 10 and the terminal 20 may be configured to include one or more of the apparatuses shown in the drawings, or may be configured to exclude some of the apparatuses.

[0095] Each function in the base station 10 and the terminal 20 is realized by loading specified software (programs) onto hardware such as the processor 1001, the memory device 1002, etc., so that the processor 1001 performs calculations, controls communication by the communication device 1004, and controls at least one of reading and writing data in the memory device 1002 and the auxiliary memory device 1003.

[0096] The processor 1001 controls the entire computer by running, for example, an operating system. The processor 1001 may be configured as a central processing unit (CPU) including an interface with peripheral devices, a control device, an arithmetic unit, a register, etc. For example, the above-mentioned control unit 140, control unit 240, etc. may be realized by the processor 1001.

[0097] Furthermore, the processor 1001 reads programs (program codes), software modules, data, etc. from at least one of the auxiliary storage device 1003 and the communication device 1004 into the storage device 1002 and executes various processes in accordance with the programs. The programs used are those that cause a computer to execute at least some of the operations described in the above-described embodiments. For example, the control unit 140 of the base station 10 shown in FIG. 10 may be implemented by a control program stored in the storage device 1002 and running on the processor 1001. Furthermore, for example, the control unit 240 of the terminal 20 shown in FIG. 11 may be implemented by a control program stored in the storage device 1002 and running on the processor 1001. While the above-described various processes have been described as being executed by one processor 1001, they may also be executed simultaneously or sequentially by two or more processors 1001. The processor 1001 may be implemented by one or more chips. The programs may also be transmitted from a network via a telecommunications line.

[0098] The storage device 1002 is a computer-readable recording medium and may be configured, for example, by at least one of a read-only memory (ROM), an erasable programmable read-only memory (EPROM), an electrically erasable programmable read-only memory (EEPROM), a random access memory (RAM), etc. The storage device 1002 may also be called a register, a cache, a main memory, etc. The storage device 1002 can store executable programs (program codes), software modules, etc. for implementing a communication method according to an embodiment of the present disclosure.

[0099] The secondary storage device 1003 is a computer-readable recording medium, and may be, for example, at least one of an optical disk such as a CD-ROM (Compact Disc ROM), a hard disk drive, a flexible 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, or other appropriate medium including at least one of the storage device 1002 and the secondary storage device 1003.

[0100] The communication device 1004 is hardware (transmission / reception device) for communicating between computers via at least one of a wired network and a wireless network, and is also referred to as, for example, a network device, a network controller, a network card, a communication module, etc. The communication device 1004 may be configured to include a high-frequency switch, a duplexer, a filter, a frequency synthesizer, etc. to realize at least one of frequency division duplex (FDD) and time division duplex (TDD). For example, a transmission / reception antenna, an amplifier unit, a transmission / reception unit, a transmission path interface, etc. may be realized by the communication device 1004. The transmission / reception unit may be implemented as a transmission unit and a reception unit that are physically or logically separated.

[0101] The input device 1005 is an input device (e.g., a keyboard, a mouse, a microphone, a switch, a button, a sensor, etc.) that receives input from the outside. The output device 1006 is an output device (e.g., a display, a speaker, an LED lamp, etc.) that outputs to the outside. Note that the input device 1005 and the output device 1006 may be integrated into one device (e.g., a touch panel).

[0102] Furthermore, each device such as the processor 1001 and the storage device 1002 is connected by a bus 1007 for communicating information. The bus 1007 may be configured using a single bus, or may be configured using different buses between each device.

[0103] Furthermore, the base station 10 and the terminal 20 may be configured to include hardware such as a microprocessor, a digital signal processor (DSP), an application specific integrated circuit (ASIC), a programmable logic device (PLD), or a field programmable gate array (FPGA), and some or all of the functional blocks may be realized by the hardware. For example, the processor 1001 may be implemented using at least one of these pieces of hardware.

[0104] Fig. 13 shows an example configuration of a vehicle 2001. As shown in Fig. 13, the vehicle 2001 includes a drive 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 aspect / embodiment described in the present disclosure may be applied to a communication device mounted on the vehicle 2001, and may be applied to the communication module 2013, for example.

[0105] The drive unit 2002 is configured, for example, by 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 the rear wheels based on the operation of the steering wheel operated by the user.

[0106] The electronic control unit 2010 is composed of a microprocessor 2031, a memory (ROM, RAM) 2032, and a communication port (IO port) 2033. Signals are input to the electronic control unit 2010 from various sensors 2021 to 2029 provided in the vehicle 2001. The electronic control unit 2010 may also be called an ECU (Electronic Control Unit).

[0107] The signals from the various sensors 2021 to 2029 include a current signal from a current sensor 2021 that senses the current of the motor, a rotation speed signal of the front and rear wheels obtained by a rotation speed sensor 2022, an air pressure signal of the front and rear wheels obtained by an air pressure sensor 2023, a vehicle speed signal obtained by a vehicle speed sensor 2024, an acceleration signal obtained by an acceleration sensor 2025, an accelerator pedal depression amount signal obtained by an accelerator pedal sensor 2029, a brake pedal depression amount signal obtained by a brake pedal sensor 2026, a shift lever operation signal obtained by a shift lever sensor 2027, and a detection signal for detecting obstacles, vehicles, pedestrians, etc. obtained by an object detection sensor 2028.

[0108] The information service unit 2012 is composed of various devices, such as a car navigation system, an audio system, speakers, a television, and a radio, for providing (outputting) various types of information, such as driving information, traffic information, and entertainment information, and one or more ECUs for controlling these devices. The information service unit 2012 uses information acquired from external devices via the communication module 2013 or the like to provide various types of multimedia information and multimedia services to the occupants of the vehicle 2001. The information service unit 2012 may include input devices (e.g., a keyboard, a mouse, a microphone, a switch, a button, a sensor, a touch panel, etc.) that accept input from the outside, and may also include output devices (e.g., a display, a speaker, an LED lamp, a touch panel, etc.) that output information to the outside.

[0109] The driving assistance system unit 2030 is composed of various devices that provide functions for preventing accidents and reducing the driving burden on the driver, such as millimeter-wave radar, LiDAR (Light Detection and Ranging), cameras, positioning locators (e.g., GNSS, etc.), map information (e.g., high-definition (HD) maps, autonomous vehicle (AV) maps, etc.), gyro systems (e.g., IMU (Inertial Measurement Unit), INS (Inertial Navigation System), etc.), AI (Artificial Intelligence) chips, and AI processors, as well as one or more ECUs that control these devices. In addition, the driving assistance system unit 2030 transmits and receives various information via the communication module 2013 to realize the driving assistance function or the autonomous driving function.

[0110] The communication module 2013 can communicate with the microprocessor 2031 and components of the vehicle 2001 via the communication port. For example, the communication module 2013 transmits and receives data via the communication port 2033 to and from the drive unit 2002, steering unit 2003, accelerator pedal 2004, brake pedal 2005, shift lever 2006, front wheels 2007, rear wheels 2008, axle 2009, microprocessor 2031 and memory (ROM, RAM) 2032 in the electronic control unit 2010, and sensors 2021 to 29, which are provided in the vehicle 2001.

[0111] 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 an external device. For example, it transmits and receives various information to and from the external device 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, a mobile station, or the like.

[0112] The communication module 2013 may transmit at least one of signals from the above-mentioned various sensors 2021-2028 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 2021-2028, the information service unit 2012, etc. may be referred to as input units that accept input. For example, the PUSCH transmitted by the communication module 2013 may include information based on the above-mentioned input.

[0113] The communication module 2013 receives various information (traffic information, traffic signal information, vehicle-to-vehicle information, etc.) transmitted from external devices and displays it on an information service unit 2012 provided in the vehicle 2001. The information service unit 2012 may be called an output unit that outputs information (for example, outputs information to a device such as a display or speaker 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 a memory 2032 that can be used by the microprocessor 2031. Based on the information stored in the memory 2032, the microprocessor 2031 may control the drive unit 2002, steering unit 2003, accelerator pedal 2004, brake pedal 2005, shift lever 2006, front wheels 2007, rear wheels 2008, axles 2009, sensors 2021 to 2029, etc. provided in the vehicle 2001.

[0114] <Additional Notes> (Additional Note 1) A network node comprising: a receiver that receives from a first network node configuration information including information on at least one of a first period, which is a period at which a terminal notifies location registration information, a number of consecutive notifications, which is a condition for changing the period, for the same location registration information being notified consecutively, and a second period, which is the period after the change; a controller that sets the configuration information; a receiver that receives from the terminal a notification message including the location registration information; and a transmitter that, when requesting the terminal to change the period, transmits to the terminal a request message including information on the changed period, (Supplementary Item 2) The network node according to Supplementary Item 1, wherein, when the receiving unit receives a notification message including location registration information that differs from location registration information included in the notification message at the time of changing the cycle, the control unit changes the cycle from the second cycle to the first cycle, and the transmitting unit transmits a request message including information related to the first cycle to the terminal. (Supplementary Item 3) A terminal comprising: a control unit that sets a cycle for notifying a network node of location registration information to a first cycle, a transmitting unit that transmits a notification message including location registration information to the network node for each of the first cycle, and a receiving unit that receives from the network node a first request message that requests a change of the cycle, the first request message including information related to the second cycle, wherein a value of at least one of the first cycle and the second cycle is a value calculated for the terminal based on a notification message notifying location registration information that was previously transmitted by the terminal, and the control unit changes the cycle from the first cycle to the second cycle based on the first request message.(Supplementary Item 4) The terminal according to Supplementary Item 3, wherein the receiving unit receives a second request message from the network node, the second request message including information related to the first period, and requesting a change of the period; and the control unit changes the period from the second period to the first period based on the second request message. (Supplementary Item 5) A communication method executed by a network node, comprising the steps of: receiving from a first network node configuration information including information on at least one of a first period, which is a period at which a terminal notifies location registration information; a number of consecutive notifications, which are conditions for changing the period, for the same location registration information to be consecutively notified; and a second period, which is the period after the change; setting the configuration information; receiving from the terminal a notification message including the location registration information; and, when requesting the terminal to change the period, sending to the terminal a request message including information on the changed period; and, when the number of consecutive times notification messages including the same location registration information have been received matches the number of consecutive notifications, changing the period from the first period to a second period and sending to the terminal a request message including information related to the second period; wherein a value of at least one of the first period, the second period, and the number of consecutive notifications is a value calculated for the terminal based on a notification message notifying location registration information that the terminal has previously sent. (Supplementary Item 6) A communication method executed by a terminal, comprising: a step of setting a period for notifying a network node of location registration information to a first period; a step of transmitting a notification message including the location registration information to the network node for each of the first period; a step of receiving a first request message from the network node, the first request message including information related to a second period, requesting a change of the period; and a step of changing the period from the first period to the second period based on the first request message, wherein a value of at least one of the first period and the second period is a value calculated for the terminal itself based on a notification message notifying location registration information that the terminal has previously transmitted.

[0115] Any of supplementary items 1 to 6 can reduce the frequency of notifications relating to location registration information from terminals in a communication system.

[0116] (Supplementary Notes on the Embodiments) Although the embodiments of the present invention have been described above, the disclosed invention is not limited to such embodiments, and those skilled in the art will understand various modifications, alterations, alternatives, and substitutions. While specific numerical examples have been used to facilitate understanding of the invention, unless otherwise specified, these numerical values ​​are merely examples, and any appropriate values ​​may be used. The division of items in the above description is not essential to the present invention; matters described in two or more items may be used in combination as needed, and matters described in one item may apply to matters described in another item (as long as there is no contradiction). Boundaries between functional units or processing units in functional block diagrams do not necessarily correspond to boundaries between physical components. The operations of multiple functional units may be performed by a single physical component, or the operations of a single functional unit may be performed by multiple physical components. The order of processing steps described in the embodiments may be reversed as long as there is no contradiction. For convenience of processing description, the base station 10 and terminal 20 have been described using functional block diagrams, but such devices may be realized by hardware, software, or a combination thereof. The software operated by the processor of the base station 10 in accordance with an embodiment of the present invention and the software operated by the processor of the terminal 20 in accordance with an embodiment of the present invention may each be stored in random access memory (RAM), flash memory, read-only memory (ROM), EPROM, EEPROM, register, hard disk (HDD), removable disk, CD-ROM, database, server, or any other suitable storage medium.

[0117] Furthermore, the notification of information is not limited to the aspects / embodiments described in the present disclosure, and may be performed using other methods. For example, the notification of information may be performed by physical layer signaling (e.g., Downlink Control Information (DCI), Uplink Control Information (UCI)), higher layer signaling (e.g., Radio Resource Control (RRC) signaling, Medium Access Control (MAC) signaling), broadcast information (Master Information Block (MIB), System Information Block (SIB)), other signals, or a combination thereof. Furthermore, the RRC signaling may be referred to as an RRC message, and may be, for example, an RRC Connection Setup message, an RRC Connection Reconfiguration message, or the like.

[0118] Each aspect / embodiment described in the present disclosure may be implemented using any of the following standards: LTE (Long Term Evolution), LTE-Advanced (LTE-A), SUPER 3G, 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 number)), 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 802.17 (WiMAX (registered trademark)), IEEE 802.19 (WiMAX (registered trademark)), IEEE 802.20 (WiMAX (registered trademark)), IEEE 802.21 (Wi-Fi (registered trademark)), IEEE 802.22 (WiMAX (registered trademark)), IEEE 802.23 (WiMAX (registered trademark)), IEEE 802.24 (WiMAX (registered trademark)), IEEE 802.25 (WiMAX (registered trademark)), IEEE 802.26 (WiMAX (registered trademark)), IEEE 802.27 (WiMAX (registered trademark)), IEEE 802.28 (WiMAX (registered trademark)), IEEE 802.29 (WiMAX (registered trademark)), IEEE 802.30 (WiMAX (registered trademark)), IEEE 802.31 (Wi-Fi (registered trademark)), IEEE 802.32 (WiMAX (registered trademark)), IEEE 802.33 (WiMAX (registered trademark)), IEEE 802.34 ( The present invention may be applied to at least one of systems using 802.20, UWB (Ultra-Wide Band), Bluetooth (registered trademark), or other suitable systems, and next-generation systems that are extended, modified, created, or defined based on these systems. The present invention may also be applied to a combination of multiple systems (e.g., a combination of LTE and / or LTE-A with 5G).

[0119] The order of the procedures, sequences, flowcharts, etc. of each aspect / embodiment described herein may be rearranged unless it is consistent. For example, the methods described in this disclosure present elements of various steps using an example order and are not limited to the particular order presented.

[0120] In this specification, a specific operation described as being performed by the base station 10 may be performed by its upper node in some cases. In a network consisting of one or more network nodes having the base station 10, it is clear that various operations performed for communication with the terminal 20 may be performed by at least one of the base station 10 and another network node other than the base station 10 (such as, but not limited to, an MME or an S-GW). Although the above example illustrates a case where there is one other network node other than the base station 10, the other network node may be a combination of multiple other network nodes (such as an MME and an S-GW).

[0121] The information, signals, etc. described in the present disclosure may be output from a higher layer (or a lower layer) to a lower layer (or a higher layer), or may be input / output via multiple network nodes.

[0122] Input and output information may be stored in a specific location (for example, memory) or may be managed using a management table. Input and output information may be overwritten, updated, or added to. Output information may be deleted. Input information may be transmitted to another device.

[0123] In the present disclosure, 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 comparison of numerical values ​​(e.g., comparison with a predetermined value).

[0124] Software shall be construed broadly to mean instructions, instruction sets, code, code segments, program code, programs, subprograms, software modules, applications, software applications, software packages, routines, subroutines, objects, executable files, threads of execution, procedures, functions, etc., whether referred to as software, firmware, middleware, microcode, hardware description language, or otherwise.

[0125] Software, instructions, information, etc. may also be transmitted or received over a transmission medium. For example, if software is transmitted from a website, server, or other remote source using wired technologies (such as coaxial cable, fiber optic cable, twisted pair, Digital Subscriber Line (DSL)), and / or wireless technologies (such as infrared, microwave), then these wired and / or wireless technologies are included within the definition of transmission media.

[0126] The information, signals, etc. described in this disclosure may be represented using any of a variety of different technologies. For example, data, instructions, commands, information, signals, bits, symbols, chips, etc. that may be referred to throughout the above description may be represented by voltages, currents, electromagnetic waves, magnetic fields or magnetic particles, optical fields or photons, or any combination thereof.

[0127] Note that terms described 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 a channel and a symbol may be a signal (signaling). Furthermore, a signal may be a message. Furthermore, a component carrier (CC) may be called a carrier frequency, a cell, a frequency carrier, etc.

[0128] As used in this disclosure, the terms "system" and "network" are used interchangeably.

[0129] Furthermore, the information, parameters, etc. described in the present disclosure may be expressed using absolute values, may be expressed using relative values ​​from a predetermined value, or may be expressed using other corresponding information. For example, a radio resource may be indicated by an index.

[0130] The names used for the above-described parameters are not intended to be limiting in any way. Furthermore, the mathematical expressions using these parameters may differ from those explicitly disclosed in this disclosure. The various channels (e.g., PUCCH, PDCCH, etc.) and information elements may be identified by any suitable names, and therefore the various names assigned to these various channels and information elements are not intended to be limiting in any way.

[0131] In the present disclosure, terms such as "base station (BS)," "radio base station," "base station device," "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. A base station may also be referred to by terms such as a macrocell, a small cell, a femtocell, and a picocell.

[0132] A base station can accommodate one or more (e.g., three) cells. When a base station accommodates multiple cells, the overall coverage area of ​​the base station can be partitioned into multiple smaller areas, and each smaller area can also be provided with communication services by a base station subsystem (e.g., a small indoor base station (RRH: Remote Radio Head)). The terms "cell" or "sector" refer to part or all of the coverage area of ​​a base station and / or base station subsystem that provides communication services within that coverage.

[0133] In the present disclosure, the base station transmitting information to a terminal may be interpreted as the base station instructing the terminal to control or operate based on the information.

[0134] In this disclosure, the terms "Mobile Station (MS)," "user terminal," "User Equipment (UE)," "terminal," and the like may be used interchangeably.

[0135] 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 suitable terminology.

[0136] At least one of the base station and the mobile station may be referred to as a transmitting device, a receiving device, a communication device, etc. At least one of the base station and the mobile station may be a device mounted on a mobile object, the mobile object itself, etc. The mobile object refers to a movable object, and may move at any speed. Naturally, this also includes cases where the mobile object is stationary. Examples of the mobile object include, but are not limited to, vehicles, transport vehicles, automobiles, motorcycles, bicycles, connected cars, excavators, bulldozers, wheel loaders, dump trucks, forklifts, trains, buses, handcars, rickshaws, ships and other watercraft, airplanes, rockets, satellites, drones (registered trademark), multicopters, quadcopters, balloons, and objects mounted thereon. The mobile object may also be a mobile object that moves autonomously based on an operational command. It may be a vehicle (e.g., a car, an airplane, etc.), an unmanned mobile object (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 be 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.

[0137] Furthermore, a base station in the present disclosure may be read as a user terminal. For example, the aspects / embodiments of the present disclosure may be applied to a configuration in which communication between a base station and a user terminal is replaced with communication between multiple terminals 20 (which may be called, for example, Device-to-Device (D2D) or Vehicle-to-Everything (V2X)). In this case, the terminal 20 may be configured to have the functions of the base station 10 described above. Furthermore, terms such as "uplink" and "downlink" may be read as terms corresponding to terminal-to-terminal communication (for example, "side"). For example, terms such as an uplink channel and a downlink channel may be read as a side channel.

[0138] Similarly, the user terminal in the present disclosure may be read as a base station, in which case the base station may be configured to have the functions of the user terminal described above.

[0139] As used in this disclosure, the terms "determining" and "determining" may encompass a wide variety of actions. "Determining" and "determining" may include, for example, judging, calculating, computing, processing, deriving, investigating, looking up, searching, inquiring (e.g., searching in a table, database, or other data structure), ascertaining, and the like. "Determining" and "determining" may also include receiving (e.g., receiving information), transmitting (e.g., sending information), input, output, accessing (e.g., accessing data in memory), and the like. Furthermore, "judgment" and "decision" can include regarding resolving, selecting, choosing, establishing, comparing, etc. as having been "judged" or "decided." In other words, "judgment" and "decision" can include regarding some action as having been "judged" or "decided." Furthermore, "judgment (decision)" can be interpreted as "assuming," "expecting," "considering," etc.

[0140] The terms "connected," "coupled," or any variation thereof, refer to 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" to each other. The coupling or connection between elements may be physical, logical, or a combination thereof. For example, "connected" may be read as "access." As used in this disclosure, two elements may be considered to be "connected" or "coupled" to each other using one or more wires, cables, and / or printed electrical connections, as well as electromagnetic energy having wavelengths in the radio frequency range, microwave range, and optical (both visible and invisible) range, as some non-limiting and non-exhaustive examples.

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

[0142] As used in this disclosure, the phrase "based on" does not mean "based only on," unless expressly stated otherwise. In other words, the phrase "based on" means both "based only on" and "based at least on."

[0143] As used in this disclosure, any reference to an element using a designation such as "first," "second," etc. does not generally limit the quantity or order of those elements. These designations may be used in this disclosure as a convenient method of distinguishing between two or more elements. Thus, a reference to a first and a second element does not imply that only two elements may be employed or that the first element must in some way precede the second element.

[0144] The "means" in the configuration of each of the above devices may be replaced with "part," "circuit," "device," etc.

[0145] When the terms "include," "including," and variations thereof are used in this disclosure, these terms are intended to be inclusive, similar to the term "comprising." Furthermore, when the term "or" is used in this disclosure, it is not intended to be an exclusive or.

[0146] In this disclosure, where articles are added by translation, such as a, an, and the in English, the disclosure may include that the nouns following these articles are in the plural form.

[0147] In the present 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 "coupled" may also be interpreted in the same way as "different."

[0148] The aspects / embodiments described in this disclosure may be used alone, in combination, or switched depending on the implementation. Notification of predetermined information (e.g., notification that "X is true") is not limited to explicit notification, but may be implicit (e.g., not notifying the predetermined information).

[0149] Although the present disclosure has been described in detail above, it is clear to those skilled in the art that the present disclosure is not limited to the embodiments described herein. The present disclosure can be implemented in modified and altered forms without departing from the spirit and scope of the present disclosure as defined by the claims. Therefore, the description of the present disclosure is intended to be illustrative and does not have any limiting meaning on the present disclosure.

[0150] REFERENCE SIGNS LIST 10 Base station 110 Transmitter 120 Receiver 130 Setting unit 140 Controller 20 Terminal 210 Transmitter 220 Receiver 230 Setting unit 240 Controller 30 Network node 1001 Processor 1002 Storage device 1003 Auxiliary storage device 1004 Communication device 1005 Input device 1006 Output device

Claims

1. A network node comprising: a receiver that receives from a first network node configuration information including information regarding at least one of a first period, which is a period at which a terminal notifies location registration information, a number of consecutive notifications, which is a condition for changing the period, for the same location registration information to be consecutively notified, and a second period, which is the changed period; a controller that sets the configuration information; a receiver that receives from the terminal a notification message including the location registration information; and a transmitter that, when requesting the terminal to change the period, transmits to the terminal a request message including information regarding the changed period; wherein at least one value of the first period, the second period, and the number of consecutive notifications is a value calculated for the terminal based on a notification message that notifies location registration information that was previously transmitted by the terminal; and when the number of consecutive times that the receiver has received notification messages including the same location registration information matches the number of consecutive notifications, the controller changes the period from the first period to the second period, and the transmitter transmits to the terminal a request message including information regarding the second period.

2. The network node according to claim 1, wherein, when the receiving unit receives a notification message including location registration information different from the location registration information included in the notification message at the time of changing the period, the control unit changes the period from the second period to the first period, and the transmission unit transmits a request message including information related to the first period to the terminal.

3. A terminal comprising: a control unit that sets the period for notifying a network node of location registration information to a first period; a transmission unit that transmits a notification message including location registration information to the network node at each of the first period; and a reception unit that receives from the network node a first request message that includes information related to a second period and requests a change of the period; wherein the value of at least one of the first period and the second period is a value calculated for the terminal itself based on a notification message notifying location registration information that the terminal has previously transmitted; and the control unit changes the period from the first period to the second period based on the first request message.

4. The terminal according to claim 3, wherein the receiving unit receives a second request message from the network node, the second request message including information related to the first period, requesting a change of the period; and the control unit changes the period from the second period to the first period based on the second request message.

5. A communication method executed by a network node, comprising the steps of: receiving from a first network node configuration information including information on at least one of a first period, which is a period at which a terminal notifies location registration information; a number of consecutive notifications, which are conditions for changing the period, for the same location registration information to be consecutively notified; and a second period, which is the changed period; setting the configuration information; receiving from the terminal a notification message including the location registration information; sending to the terminal a request message including information on the changed period when requesting the terminal to change the period; and, when the number of consecutive times notification messages including the same location registration information have been received matches the number of consecutive notifications, changing the period from the first period to a second period and sending to the terminal a request message including information on the second period; wherein the value of at least one of the first period, the second period, and the number of consecutive notifications is a value calculated for the terminal based on a notification message notifying location registration information that the terminal has previously sent.

6. A communication method executed by a terminal, comprising: a step of setting a period for notifying a network node of location registration information to a first period; a step of transmitting a notification message including the location registration information to the network node for each of the first period; a step of receiving a first request message from the network node, the first request message including information related to a second period, requesting a change of the period; and a step of changing the period from the first period to the second period based on the first request message, wherein the value of at least one of the first period and the second period is a value calculated for the terminal itself based on a notification message notifying location registration information that the terminal has previously transmitted.

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