WO2025203695A1 - Terminal, network node, and communication method - Google Patents

Abstract

This terminal comprises: a reception unit that receives, from a first node or a second node, configuration information that includes information pertaining to at least one of a first cycle that is the cycle during which the terminal provides notification of position registration information, a consecutive notification count that serves as a condition for changing the cycle and relates to consecutive notification of the same position registration information, and a second cycle that is the cycle after the change; a control unit that configures the configuration information; and a transmission unit that transmits, to the second node, a notification message including the position registration information. At least one value among the first cycle, the second cycle, and the consecutive notification count is calculated for the subject terminal on the basis of notification messages for notification of the position registration information previously transmitted by the subject terminal. When the notification count, which relates to consecutive notification of the notification messages including the same position registration information, matches the consecutive notification count, the cycle is changed from the first cycle to the second cycle, and a request message that includes information related to the second cycle and that is for requesting change of the cycle is transmitted to the second node.

Description

Terminal, network node, and communication method

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

3GPP (registered trademark) (3rd Generation Partnership Project) is currently studying a wireless communication method known as 5G or NR (New Radio) (hereinafter referred to as "5G" or "NR") in order to achieve even greater system capacity, even faster data transmission speeds, and even lower latency in wireless sections. Various wireless technologies are being studied for 5G in order to meet the requirements of achieving a throughput of 10 Gbps or more while keeping wireless section latency to 1 ms or less.

NR is considering network architectures including 5GC (5G Core Network) or 5GS (5G System), which correspond to EPC (Evolved Packet Core), the core network in the LTE (Long Term Evolution) network architecture, and NG-RAN (Next Generation Radio Access Network), which corresponds to E-UTRAN (Evolved Universal Terrestrial Radio Access Network), the RAN (Radio Access Network) in the LTE network architecture (for example, Non-Patent Document 1).

In addition, 5GS will support AI (Artificial Intelligence) and machine learning technologies to support intelligent network automation. Furthermore, the NWDAF (Network Data Analytics Function) will collect data from data sources such as the NF (Network Function), AF (Application Function), and OAM (Operations, Administration, and Maintenance), perform network data analysis based on the input data, and provide the analysis results (for example, Non-Patent Document 2).

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

In order to periodically register its location registration information, a terminal notifies the network of its location registration information. Under existing specifications, even when 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.

The present invention was made in consideration of the above points, and aims to reduce the frequency of notifications related to location registration information from terminals in communication systems.

According to the disclosed technology, there is provided a terminal having a receiver that receives from a first network node or a second 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 at which the same location registration information is consecutively notified, and a second period, which is the changed period, which are conditions for changing the period; a controller that sets the configuration information; and a transmitter that transmits a notification message including the location registration information to the second network node, 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 the terminal previously sent, and when the number of consecutive notifications at which notification messages including the same location registration information are consecutively notified matches the number of consecutive notifications, the controller changes the period from the first period to the second period, and the transmitter transmits a request message to the second network node that requests a change of the period, including information related to the second period.

The disclosed technology makes it possible to reduce the frequency of notifications related to location registration information from terminals in a communication system.

FIG. 1 is a diagram illustrating an example of a communication system. FIG. 1 is a diagram illustrating an example of a communication system in a roaming environment. A diagram for explaining a state transition model of a terminal in 5GS. FIG. 1 is a diagram for explaining an overview of a first embodiment of the present invention. FIG. 10 is a diagram showing an example of a sequence diagram relating to a change of a period in the first example of the embodiment of the present invention; FIG. 10 is a diagram showing an example of a sequence diagram relating to cancellation of a change in a period in the first example of an embodiment of the present invention; FIG. 10 is a diagram for explaining an outline of a second embodiment of the present invention. FIG. 10 is a diagram showing an example of a sequence diagram relating to a change of a period in the second example of the embodiment of the present invention. FIG. 10 is a diagram showing an example of a sequence diagram relating to canceling a change in a period in the second example of an embodiment of the present invention. FIG. 2 is a diagram illustrating an example of the functional configuration of a base station 10 and a network node 30 according to an embodiment of the present invention. FIG. 2 is a diagram illustrating an example of a functional configuration of a terminal 20 according to an embodiment of the present invention. 2 is a diagram illustrating an example of a hardware configuration of a base station 10 and a terminal 20 according to an embodiment of the present invention. FIG. FIG. 2 is a diagram showing an example of the configuration of a vehicle 2001 according to an embodiment of the present invention.

The following describes an embodiment of the present invention with reference to the drawings. Note that the embodiment described below is an example, and the embodiments to which the present invention can be applied are not limited to the following embodiment.

In operating the wireless communication system of an embodiment of the present invention, existing technology is used as appropriate. However, the existing technology in question 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, systems subsequent to LTE-Advanced (e.g., NR), and wireless LAN (Local Area Network), unless otherwise specified.

Furthermore, in the embodiments of the present invention, "configuring" radio parameters etc. may mean that predetermined values are pre-configured, or that radio parameters notified from the network node 30 or terminal 20 are configured.

Figure 1 is a diagram illustrating an example of a communication system. As shown in Figure 1, the communication system is composed of a UE, which is a terminal 20, and multiple network nodes 30. Below, 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.

The RAN (Radio Access Network) is a network node 30 with radio access functionality, 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 with functions such as RAN interface termination, NAS (Non-Access Stratum) termination, registration management, connection management, reachability management, and mobility management. The UPF is a network node 30 with functions such as a PDU (Protocol Data Unit) session point to the outside that interconnects with the DN (Data Network), packet routing and forwarding, and user plane QoS (Quality of Service) handling. The UPF and DN constitute a network slice. In the wireless communication network of an embodiment of the present invention, multiple network slices are constructed.

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 interconnected via their respective service-based interfaces: Namf, Nsmf, Nnssf, Nnef, Nnrf, Nudm, Nausf, Npcf, and Naf.

The SMF is a network node 30 that has 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 that has the function of notifying other NFs (Network Functions) of capabilities and events. The NSSF is a network node 30 that has functions such as selecting the network slice to which the UE connects, determining the allowed NSSAI (Network Slice Selection Assistance Information), determining the NSSAI to be set, and determining the AMF set to which the UE connects. The PCF is a network node 30 that has the function of controlling network policies. The AF is a network node 30 that has the function of controlling application servers. The NRF is a network node 30 that has the 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 the UDR (User Data Repository) that holds this data.

Figure 2 is a diagram illustrating an example of a communication system in a roaming environment. As shown in Figure 2, the network is composed of a terminal 20 (UE) and multiple network nodes 30. Below, 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.

The RAN is a network node 30 with radio access functionality, and is connected to the UE, AMF, and UPF. The AMF is a network node 30 with functions such as RAN interface termination, NAS termination, registration management, connection management, reachability management, and mobility management. The UPF is a network node 30 with 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 DN constitute a network slice. In the wireless communication network of an embodiment of the present invention, multiple network slices are constructed.

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 their respective service-based interfaces: Namf, Nsmf, Nnssf, Nnef, Nnrf, Nudm, Nausf, Npcf, and Naf.

The SMF is a network node 30 that has 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 that has the function of notifying other NFs of capabilities and events. The NSSF is a network node 30 that has functions such as selecting the network slice to which the UE connects, determining the allowed NSSAI, determining the configured NSSAI, and determining the AMF set to which the UE connects. The PCF is a network node 30 that has the function of controlling network policies. The AF is a network node 30 that has the function of controlling application servers. The NRF is a network node 30 that has the 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 Figure 2 is a SEPP in the visited network, and the hSEPP is a SEPP in the home network.

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

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

First Example
A first embodiment 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 embodiment, 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.

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

Furthermore, some or all of the number of consecutive notifications and periodic 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 the Consumer. Here, the network node 30B is, for example, an NWDAF (Network Data Analytics Function). Alternatively, the network node 30B may collect periodic location information and/or calculate the setting information.

Figure 4 is a diagram for explaining an overview of a first embodiment of the present invention. The processing of each step in Figure 4 will be explained below.

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

S101: Network node 30A detects that the location registration information notified from terminal 20 is the same N times in a row. Here, a number of times, such as N = 3, is preset as a condition for changing the notification cycle for the location registration information.

S102: Network node 30A decides to change the notification period related to location registration information (lengthen the period) and requests terminal 20 to make the change.

S103: Based on a request from network node 30A, terminal 20 changes the notification period related to location registration information (lengthens the period).

As described above, if network node 30A receives a predetermined number of consecutive notifications related to the same location registration information from terminal 20, it changes the notification cycle related to the location registration information (lengthens the cycle).

Next, the process for changing the period in the first embodiment will be explained in detail. Figure 5 shows an example of a sequence diagram for changing the period in the first embodiment of the present invention. The process for each step in Figure 5 will be explained below.

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

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

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

S113: Network node 30A detects that it has received N consecutive notification messages for registering location registration information containing the same location registration information from terminal 20.

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

S115: The network node 30A sends the terminal 20 a request message for changing the cycle, including information about the cycle changed in S114.

S116: Based on the information about the period received in S115, the terminal 20 executes settings to change the period for notifying location registration information.

Next, we will explain the process of canceling the change to the period for notifying location registration information after the change has been made. Figure 6 shows an example of a sequence diagram related to canceling a change to the period in the first embodiment of the present invention. The process of each step in Figure 6 will be explained below.

S121: Terminal 20 transmits a notification message to network node 30A to register location registration information. Here, the location registration information contained in this notification message differs from the location registration information contained in the notification message received in S112 of FIG. 5 due to the movement of terminal 20.

S122: Network node 30A detects that the location registration information included in the notification message received in S121 differs from the location registration information included in the notification message received in S112 of FIG. 5 (when the cycle was changed).

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

S124: The network node 30A sends a period change request message to the terminal 20, including information about the period changed in S123.

S125: Based on the information regarding the period received in S124, the terminal 20 executes settings to change the period for notifying location registration information.

Second Example
A second embodiment 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 embodiment, 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.

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

Furthermore, some or all of the number of consecutive notifications and periodic 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 the Consumer. Here, the network node 30B is, for example, an NWDAF (Network Data Analytics Function). Alternatively, the network node 30B may collect periodic location information and/or calculate the setting information.

Figure 7 is a diagram for explaining an overview of a second embodiment of the present invention. The processing of each step in Figure 7 will be explained below.

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

S201: Terminal 20 detects that the location registration information notified to network node 30A is the same N times in a row. Here, a condition for changing the notification cycle for the location registration information is preset, for example, a number of times, such as N = 3.

S202: Based on the detection result in S201, the terminal 20 changes the notification cycle related to the location registration information (lengthens the cycle).

S203: Terminal 20 requests network node 30A to change the notification period related to location registration information.

S204: Based on the request received from the terminal 20 in S203, the network node 30A changes the notification period related to the location registration information (lengthens the period).

As described above, if the terminal 20 has issued a predetermined number of consecutive notifications related to the same location registration information, it changes the notification cycle for the location registration information (lengthens the cycle) and further requests the network node 30 to make the change.

Next, we will explain in detail the processing related to the period change in the second embodiment. Figure 8 is a diagram showing an example of a sequence diagram related to the period change in the second embodiment of the present invention. The processing of each step in Figure 8 will be explained below.

S210: The network node 30B notifies the terminal 20 of the setting information (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 setting information to the network node 30A, and the network node 30A may notify the terminal 20 of the setting information. Alternatively, for example, the AMF may notify the terminal 20 of the setting information during the registration procedure of the terminal 20 to the network.

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

S212: Terminal 20 transmits a notification message to network node 30A to register location registration information. Here, terminal 20 transmits the notification message containing the same location registration information N times in succession.

S213: Terminal 20 detects that it has sent a notification message for registering location registration information containing the same location registration information N times in succession to network node 30A.

S214: The terminal 20 decides to change the interval for notifying location registration information to a longer interval (for example, T + A time) and sets the changed interval.

S215: The terminal 20 sends a period change request message to the network node 30A, including information about the period changed in S214.

S216: Based on the information regarding the period received in S215, network node 30A performs settings to change the period for notifying location registration information.

S217: Network node 30A sends a notification message to terminal 20 notifying that the change in the period for notifying location registration information has been completed.

Next, we will explain the process of canceling the change to the period for notifying location registration information after the change has been made. Figure 9 is an example of a sequence diagram related to canceling a change to the period in a second embodiment of the present invention. The process of each step in Figure 9 will be explained below.

S221: Terminal 20 transmits a notification message to network node 30A to register location registration information. Here, the location registration information included in this notification message differs from the location registration information included in the notification message received in S212 of FIG. 8 due to the movement of terminal 20.

S222: Terminal 20 detects that the location registration information included in the notification message sent in S221 differs from the location registration information included in the notification message received in S212 of FIG. 8 (when the cycle was changed).

S223: The terminal 20 cancels the change to 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).

S224: The terminal 20 sends a period change request message to the network node 30A, including information about the period changed in S223.

S225: Based on the information regarding the period received in S224, network node 30A performs settings to change the period for notifying location registration information.

S226: Network node 30A sends a notification message to terminal 20 notifying that the change in the period for notifying location registration information has been completed.

<How to change the notification interval for location registration information>
A method for changing (lengthening) the notification cycle related to location registration information in S114 of FIG. 5 in the first embodiment or S214 of FIG. 8 in the second embodiment will be described.

Note that the values related to periodic changes described below may be values included in the setting information related to periodic location registration, calculated using the AI or machine learning model mentioned above.

In the first method, the period before the change (time T) is added to a predetermined time (time A) to obtain the changed period (time T + time A).

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 x B).

As a third method, the terminal 20 and network node 30A first share information about 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 network node 30A notify each other of the index values in the list, thereby setting the initial and changed period values.

<First Modification>
A first modification of the above-described embodiment will now 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 (lengthens the period) based on the duration. 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 period for notifying the same location registration information 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.

<Second Modification>
A second modification of the above-described embodiment will now 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, if the terminal 20 or the network node 30A receives the same location registration information N times in succession again, changes the period again. 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.

<Third Modification>
A third modification of the above-described embodiment will now 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 notification of 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.

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 perspective of power efficiency, it is possible to reduce battery consumption in terminals. Furthermore, from the perspective of network resilience, by reducing unnecessary information transmissions, it is possible to prevent congestion and improve network resilience.

(Device configuration)
Next, examples of functional configurations 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 will be described. 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.

<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.

The transmitter 110 includes a function for generating signals to be transmitted to the terminal 20 or other network nodes 30, and transmitting the signals via wired or wireless communication. The receiver 120 includes a function for receiving various signals transmitted from the terminal 20 or other network nodes 30, and for example, obtaining information of higher layers from the received signals. A communication unit including the transmitter 110 and receiver 120 may be configured.

The setting unit 130 stores pre-set setting information and various setting information to be sent to the terminal 20 in a storage device, and reads it from the storage device as needed.

As explained in the embodiments, the control unit 140 performs processes such as reducing the frequency of notifications of location registration information. The control unit 140 also performs processes related to communication with the terminal 20. The functional unit in the control unit 140 related to signal transmission may be included in the transmitting unit 110, and the functional unit in the control unit 140 related to signal reception may be included in the receiving unit 120.

<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.

The transmitter 210 creates a transmission signal from the 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 the function of receiving NR-PSS, NR-SSS, NR-PBCH, DL/UL control signals, reference signals, etc. transmitted from the network node 30. A communication unit including the transmitter 210 and receiver 220 may be configured.

The setting unit 230 stores various setting information received from the network node 30 by the receiving unit 220 in a storage device, and reads it from the storage device as needed. The setting unit 230 also stores setting information that has been set in advance.

As explained in the embodiments, the control unit 240 performs processing such as reducing the frequency of location registration information notifications. The signal transmission functional unit in the control unit 240 may be included in the transmitting unit 210, and the signal reception functional unit in the control unit 240 may be included in the receiving unit 220.

(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 (e.g., using wires, wirelessly, etc.) and these multiple devices. The functional block may also be realized by combining software with the single device or multiple devices.

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

For example, the network node 30, terminal 20, etc. in one embodiment of the present disclosure may function as a computer that performs processing of the wireless communication method of the present disclosure. Figure 12 is a diagram showing an example of the hardware configuration of a base station 10 and terminal 20 in one embodiment of the present disclosure. The network node 30 may have the same hardware configuration as the base station 10. The above-mentioned base station 10 and 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.

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

The functions of the base station 10 and terminal 20 are realized by loading specific software (programs) onto hardware such as the processor 1001 and storage device 1002, causing the processor 1001 to perform calculations, control communications via the communication device 1004, and control at least one of the reading and writing of data from and to the storage device 1002 and auxiliary storage device 1003.

The processor 1001, for example, runs an operating system to control the entire computer. The processor 1001 may be configured as a central processing unit (CPU) that includes an interface with peripheral devices, a control unit, an arithmetic unit, registers, etc. For example, the above-mentioned control unit 140, control unit 240, etc. may be realized by the processor 1001.

The processor 1001 also loads programs (program code), 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 these. 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. 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 various processes described above have been described as being executed by a single processor 1001, they may also be executed simultaneously or sequentially by two or more processors 1001. The processor 1001 may be implemented on one or more chips. The programs may also be transmitted from a network via a telecommunications line.

The storage device 1002 is a computer-readable recording medium and may be composed of, for example, at least one of a ROM (Read Only Memory), an EPROM (Erasable Programmable ROM), an EEPROM (Electrically Erasable Programmable ROM), a RAM (Random Access Memory), 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 code), software modules, etc. for implementing a communication method according to one embodiment of the present disclosure.

Auxiliary storage device 1003 is a computer-readable recording medium, and may be composed of at least one of, for example, 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, 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 suitable medium that includes at least one of storage device 1002 and auxiliary storage device 1003.

The communication device 1004 is hardware (transmitting/receiving device) for communicating between computers via at least one of a wired network and a wireless network, and is also referred to as a network device, network controller, network card, or communication module, for example. The communication device 1004 may be configured to include high-frequency switches, duplexers, filters, frequency synthesizers, etc. to implement at least one of frequency division duplex (FDD) and time division duplex (TDD). For example, the transmitting/receiving antenna, amplifier unit, transmitting/receiving unit, transmission path interface, etc. may be implemented by the communication device 1004. The transmitting/receiving unit may be implemented as a physically or logically separated transmitting unit and receiving unit.

The input device 1005 is an input device (e.g., a keyboard, mouse, microphone, switch, button, sensor, etc.) that accepts input from the outside. The output device 1006 is an output device (e.g., a display, speaker, 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).

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.

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 this hardware. For example, the processor 1001 may be implemented using at least one of these pieces of hardware.

FIG. 13 shows an example configuration of vehicle 2001. As shown in FIG. 13, 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 2021-2029, an information service unit 2012, and a communication module 2013. Each aspect/embodiment described in this disclosure may be applied to a communication device mounted on vehicle 2001, and may be applied to communication module 2013, for example.

The drive 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 called a handle) and is configured to steer at least one of the front wheels and rear wheels based on the operation of the steering wheel operated by the user.

The electronic control unit 2010 is composed of a microprocessor 2031, 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 on the vehicle 2001. The electronic control unit 2010 may also be called an ECU (Electronic Control Unit).

Signals from the various sensors 2021-2029 include a current signal from a current sensor 2021 that senses the motor current, a front and rear wheel rotation speed signal obtained by a rotation speed sensor 2022, a front and rear wheel air pressure signal 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.

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

The driving assistance system unit 2030 is composed of various devices that provide functions to prevent accidents and reduce the driver's driving burden, 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. The driving assistance system unit 2030 also transmits and receives various information via the communication module 2013 to realize driving assistance functions or autonomous driving functions.

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 between 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 2021-29, all of which are provided on the vehicle 2001.

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

The communications module 2013 may transmit, via wireless communication, to an external device at least one of the following: signals from the various sensors 2021-2028 input to the electronic control unit 2010; information obtained based on these signals; and information based on input from the outside (user) obtained via the information service unit 2012. The electronic control unit 2010, the various sensors 2021-2028, the information service unit 2012, etc. may also be referred to as input units that accept input. For example, the PUSCH transmitted by the communications module 2013 may include information based on the above input.

The communication module 2013 receives various information (traffic information, traffic signal information, vehicle distance information, etc.) transmitted from external devices and displays it on the information service unit 2012 provided in the vehicle 2001. The information service unit 2012 may also 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 memory 2032 that can be used by the microprocessor 2031. Based on the information stored in memory 2032, the microprocessor 2031 may control the drive unit 2002, steering unit 2003, accelerator pedal 2004, brake pedal 2005, shift lever 2006, front wheels 2007, rear wheels 2008, axles 2009, sensors 2021-2029, etc. provided in the vehicle 2001.

<Additional Notes>
(Additional note 1)
a receiving unit that receives, from a first network node or a second network node, configuration information including information regarding at least one of a first cycle, which is a cycle at which a terminal notifies location registration information, a number of consecutive notifications at which the same location registration information is consecutively notified, which are conditions for changing the cycle, and a second cycle, which is the cycle after the change;
a control unit that sets the setting information;
a transmitter for transmitting a notification message including location registration information to the second network node;
and
at least one value of the first period, the second period, and the number of consecutive notifications is a value calculated for the terminal itself based on a notification message that notifies location registration information previously transmitted by the terminal itself,
When the number of consecutive notification messages including the same location registration information matches the number of consecutive notification messages, the control unit changes the cycle from the first cycle to the second cycle, and the transmission unit transmits a request message including information related to the second cycle to the second network node, requesting a change of the cycle.
Terminal.
(Additional note 2)
when the transmitter transmits a notification message including location registration information different from location registration information included in the notification message at the time of changing the cycle, the controller changes the cycle from the second cycle to the first cycle, and the transmitter transmits a request message to the second network node, the request message including information related to the first cycle, requesting a change of the cycle.
A terminal according to claim 1.
(Additional note 3)
a transmitter that transmits to the terminal setting information including information on at least one of a first cycle, which is a cycle at which the terminal notifies location registration information, a number of consecutive notifications at which the same location registration information is consecutively notified, which are conditions for changing the cycle, and a second cycle, which is the cycle after the change;
a control unit that sets the setting information;
a receiving unit that receives a notification message including location registration information from the terminal;
and
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 previously transmitted by the terminal,
the receiving unit receives a first message from the terminal requesting a change of the period;
the control unit changes the cycle from the first cycle to the second cycle based on the first message;
Network node.
(Additional note 4)
the receiving unit receives a second message from the network node, the second message including information related to the first period and requesting a change of the period;
the control unit changes the cycle from the second cycle to the first cycle based on the second message.
A network node according to claim 3.
(Additional note 5)
receiving, from the first network node or the second network node, configuration information including information regarding at least one of a first cycle, which is a cycle at which the terminal notifies location registration information, a number of consecutive notifications at which the same location registration information is consecutively notified, which are conditions for changing the cycle, and a second cycle, which is the cycle after the change;
a control unit that sets the setting information;
sending a notification message to the second network node, the notification message including location registration information;
and
If the number of consecutive notifications of notification messages containing the same location registration information matches the number of consecutive notifications,
changing the periodicity from the first periodicity to the second periodicity and transmitting a request message to the second network node requesting the change of the periodicity, the request message including information related to the second periodicity;
and
At least one value of the first period, the second period, and the number of consecutive notifications is a value calculated for the terminal itself based on a notification message notifying location registration information previously transmitted by the terminal itself.
The communication method implemented by the device.
(Additional note 6)
transmitting to the terminal setting information including information on at least one of a first cycle, which is a cycle at which the terminal notifies location registration information, a number of consecutive notifications at which the same location registration information is consecutively notified, which are conditions for changing the cycle, and a second cycle, which is the cycle after the change;
setting the setting information;
receiving a notification message including location registration information from the terminal;
receiving a first message from the terminal requesting a change of the period;
changing the period from the first period to the second period based on the first message;
and
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 previously transmitted by the terminal.
The communication method implemented by network nodes.

All of Supplementary Items 1 to 6 make it possible to reduce the frequency of notifications of location registration information by terminals in a communication system.

(Supplementary explanation of the embodiment)
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 (unless inconsistent). 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 implemented in 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.

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., DCI (Downlink Control Information), UCI (Uplink Control Information)), higher layer 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 of these. Furthermore, 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, etc.

The aspects/embodiments described in this disclosure may be applied to 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 decimal number)), FRA (Future Radio Access Network), The present invention may be applied to at least one of systems using IEEE 802.11 (Wi-Fi (registered trademark)), IEEE 802.16 (WiMAX (registered trademark)), IEEE 802.20 (Ultra-Wideband), Bluetooth (registered trademark), CDMA2000, NR (new 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 802.20, UWB (Ultra-Wideband), Bluetooth (registered trademark), or other appropriate systems, as well as next-generation systems that are extended, modified, created, or defined based on these. It may also be applied to a combination of multiple systems (for example, a combination of at least one of LTE and LTE-A with 5G).

The order of the processing procedures, sequences, flowcharts, etc. of each aspect/embodiment described herein may be changed 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.

In this specification, certain operations described as being performed by the base station 10 may also be performed by its upper node in some cases. In a network consisting of one or more network nodes having a 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 other network nodes other than the base station 10 (such as, but not limited to, an MME or S-GW). While the above example illustrates a case where there is one other network node other than the base station 10, the other network node may also be a combination of multiple other network nodes (for example, an MME and an S-GW).

The information, signals, etc. described in this disclosure may be output from a higher layer (or lower layer) to a lower layer (or higher layer). They may also be input/output via multiple network nodes.

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 sent to another device.

In this disclosure, the determination may be made based on a value represented by one bit (0 or 1), a Boolean value (true or false), or a numerical comparison (e.g., comparison with a predetermined value).

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.

In addition, software, instructions, information, etc. may be transmitted and received via a transmission medium. For example, if software is transmitted from a website, server, or other remote source using wired technology (such as coaxial cable, fiber optic cable, twisted pair, or Digital Subscriber Line (DSL)) and/or wireless technology (such as infrared or microwave), then the wired and/or wireless technology is included within the definition of a transmission medium.

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.

Note that terms explained 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.

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

Furthermore, the information, parameters, etc. described in this disclosure may be expressed using absolute values, relative values from a predetermined value, or other corresponding information. For example, radio resources may be indicated by an index.

The names used for the parameters described above are not intended to be limiting in any way. Furthermore, the mathematical formulas 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.

In this 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. Base stations may also be referred to by terms such as macrocell, small cell, femtocell, and picocell.

A base station can accommodate one or more (e.g., three) cells. When a base station accommodates multiple cells, the entire coverage area of the base station can be divided 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 at least one of the base station and base station subsystem that provides communication services within this coverage area.

In this disclosure, a 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.

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

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.

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 an object that can 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 operation 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). Note that 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.

Furthermore, the 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, D2D (Device-to-Device) or V2X (Vehicle-to-Everything)). In this case, the terminals 20 may be configured to have the functions possessed by the base station 10 described above. Furthermore, terms such as "uplink" and "downlink" may be read as terms corresponding to communication between terminals (for example, "side"). For example, terms such as uplink channel and downlink channel may be read as side channel.

Similarly, the user terminal in this disclosure may be interpreted as a base station. In this case, the base station may be configured to have the functions possessed by the user terminal described above.

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 a table, database, or other data structure), and ascertaining something that is considered to be a "determination." "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 so on. Furthermore, "judgment" and "decision" can include regarding actions such as resolving, selecting, choosing, establishing, and comparing as having been "judgment" or "decision." In other words, "judgment" and "decision" can include regarding some action as having been "judgment" or "decision." Furthermore, "judgment (decision)" can be interpreted as "assuming," "expecting," "considering," etc.

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 at least one of one or more wires, cables, and 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.

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

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."

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.

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

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.

In this disclosure, where articles are added by translation, such as a, an, and the in English, this disclosure may include the noun following these articles being plural.

In this disclosure, the term "A and B are different" may mean "A and B are different from each other." Note that this term may also mean "A and B are each different from C." Terms such as "separate" and "combined" may also be interpreted in the same way as "different."

Each aspect/embodiment described in this disclosure may be used alone, in combination, or switched between depending on the implementation. Furthermore, notification of specified information (e.g., notification that "X is true") is not limited to being done explicitly, but may also be done implicitly (e.g., not notifying the specified information).

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

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

Claims (6)

a receiving unit that receives, from a first network node or a second network node, configuration information including information regarding at least one of a first cycle, which is a cycle at which a terminal notifies location registration information, a number of consecutive notifications at which the same location registration information is consecutively notified, which are conditions for changing the cycle, and a second cycle, which is the cycle after the change;
a control unit that sets the setting information;
a transmitter for transmitting a notification message including location registration information to the second network node;
and
at least one value of the first period, the second period, and the number of consecutive notifications is a value calculated for the terminal itself based on a notification message that notifies location registration information previously transmitted by the terminal itself,
When the number of consecutive notification messages including the same location registration information matches the number of consecutive notification messages, the control unit changes the cycle from the first cycle to the second cycle, and the transmission unit transmits a request message including information related to the second cycle to the second network node, requesting a change of the cycle.
Terminal. when the transmitter transmits a notification message including location registration information different from location registration information included in the notification message at the time of changing the cycle, the controller changes the cycle from the second cycle to the first cycle, and the transmitter transmits a request message to the second network node, the request message including information related to the first cycle, requesting a change of the cycle.
The terminal according to claim 1 . a transmitter that transmits to the terminal setting information including information on at least one of a first cycle, which is a cycle at which the terminal notifies location registration information, a number of consecutive notifications at which the same location registration information is consecutively notified, which are conditions for changing the cycle, and a second cycle, which is the cycle after the change;
a control unit that sets the setting information;
a receiving unit that receives a notification message including location registration information from the terminal;
and
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 previously transmitted by the terminal,
the receiving unit receives a first message from the terminal requesting a change of the period;
the control unit changes the cycle from the first cycle to the second cycle based on the first message;
Network node. the receiving unit receives a second message from the network node, the second message including information related to the first period and requesting a change of the period;
the control unit changes the cycle from the second cycle to the first cycle based on the second message.
The network node of claim 3 . receiving, from the first network node or the second network node, configuration information including information regarding at least one of a first cycle, which is a cycle at which the terminal notifies location registration information, a number of consecutive notifications at which the same location registration information is consecutively notified, which are conditions for changing the cycle, and a second cycle, which is the cycle after the change;
a control unit that sets the setting information;
sending a notification message to the second network node, the notification message including location registration information;
and
If the number of consecutive notifications of notification messages containing the same location registration information matches the number of consecutive notifications,
changing the periodicity from the first periodicity to the second periodicity and transmitting a request message to the second network node requesting the change of the periodicity, the request message including information related to the second periodicity;
and
At least one value of the first period, the second period, and the number of consecutive notifications is a value calculated for the terminal itself based on a notification message notifying location registration information previously transmitted by the terminal itself.
The communication method implemented by the device. transmitting to the terminal setting information including information on at least one of a first cycle, which is a cycle at which the terminal notifies location registration information, a number of consecutive notifications at which the same location registration information is consecutively notified, which are conditions for changing the cycle, and a second cycle, which is the cycle after the change;
setting the setting information;
receiving a notification message including location registration information from the terminal;
receiving a first message from the terminal requesting a change of the period;
changing the period from the first period to the second period based on the first message;
and
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 previously transmitted by the terminal.
The communication method implemented by network nodes.