Network management device and program

Abstract

In order to suppress the occurrence of failure in a higher-level service due to an abnormality occurring in a wireless communication network in an information processing system in which the higher-level service and the wireless communication network cooperate with each other to provide a service, this network management device comprises: a detection unit that detects a wireless area in which the occurrence of an abnormality related to a higher-level service cooperating with a wireless communication network is predicted; and a notification unit that notifies a service management system managing the higher-level service of information relating to the wireless area.

Description

Network management device and program

[0001] The present invention relates to a network management device and a program.

[0002] There is an information processing system in which a higher-level service and a communication network cooperate to provide a predetermined service. For example, a technology is known in which the higher-level service collects quality measurement information, analysis information, prediction information, or the like from the communication network (see, for example, Non-Patent Document 1).

[0003] Also, a routing control system is known that optimizes routes between virtual machines in a data center and client terminals under an external network in an environment where data centers are connected via a wide area network (see, for example, Patent Document 1).

[0004] A.TAKAHASHI, T.HAYASHI, "Collaborative Quality Framework: QoE-Centric Service Operation in Collaboration with Users, Service Providers, and Network Operators," IEICE TRANS. COMMUN., VOL.E100-B, NO.9 SEPTEMBER 2017, pp.1554-1563.

[0005] Japanese Patent Application Laid-Open No. 2018-32936

[0006] For example, in mobility-related upper services such as autonomous driving, safety in autonomous driving is ensured by remote monitoring from a control center, etc. Therefore, for example, if an abnormality occurs in a wireless communication network that links with the upper service, there is a possibility that a failure will occur in the mobility-related upper service as well.

[0007] However, conventional technologies have a problem in that they are unable to prevent failures in higher-level services due to abnormalities occurring in wireless communication networks.

[0008] One embodiment of the present invention has been made in consideration of the above-mentioned problems, and in an information processing system in which a higher-level service and a wireless communication network work together to provide services, it prevents a failure in the higher-level service due to an abnormality occurring in the wireless communication network.

[0009] In order to solve the above problem, a network management device according to one embodiment of the present invention has a detection unit that detects a wireless area in which an abnormality related to a higher-level service that cooperates with a wireless communication network is predicted to occur, and a notification unit that notifies a service management system that manages the higher-level service of information regarding the wireless area.

[0010] According to one embodiment of the present invention, in an information processing system in which a higher-level service and a wireless communication network work together to provide services, it is possible to prevent failures in the higher-level service due to abnormalities occurring in the wireless communication network.

[0011] FIG. 1 is a diagram illustrating an example of the configuration of an information processing system according to the present embodiment; FIG. 2 is a diagram illustrating an example of information managed by a network management device according to the present embodiment; FIG. 3 is a flowchart illustrating an example of processing by an information processing system according to Example 1; FIG. 4 is a diagram illustrating an image of a first wireless area according to Example 1; FIG. 5 is a flowchart illustrating an example of processing by an information processing system according to Example 2; FIG. 6 is a diagram illustrating an image of a first wireless area and a second wireless area according to Example 2; FIG. 7 is a diagram illustrating an overview of processing by an information processing system according to Example 3; FIG. 8 is a flowchart illustrating an example of processing by an information processing system according to Example 3; and FIG. 9 is a diagram for explaining an example of analysis processing according to Example 3.

[0012] Hereinafter, an embodiment of the present invention will be described with reference to the drawings. The embodiment described below is merely an example, and the embodiment to which the present invention is applied is not limited to the following embodiment.

[0013] <Configuration of Information Processing System> Fig. 1 is a diagram showing an example of the configuration of an information processing system according to this embodiment. In the example of Fig. 1, the information processing system 1 includes a service management system 10 that provides a higher-level mobility service such as autonomous driving, and a network management device 100 that manages a wireless communication network that cooperates with the higher-level service. Note that the information processing system 1 is an example of a system in which the higher-level service and the communication network cooperate to provide a predetermined service.

[0014] The service management system 10 is a system that uses a wireless communication network managed by the network management device 100 to remotely monitor, operate, or control mobility such as automobiles. Here, mobility can include various moving devices other than automobiles, such as motorcycles, mobility scooters, or walking robots. Furthermore, mobility can also include various flying objects within an area that use a wireless communication network for control, such as drones, flying taxis, or flying cars. Here, the following explanation will be given assuming, as an example, that the mobility is smart mobility (e.g., an automobile) that can be driven autonomously or remotely.

[0015] The network management device (network management system) 100 is, for example, an information processing device having a computer configuration, or a system configured by multiple computers. The network management device 100 manages a wireless communication network that cooperates with a higher-level service (mobility service) provided by the service management system 10. Preferably, the wireless communication network managed by the network management device 100 is a network that requires communication immediacy, such as local 5G (5th Generation) or private 5G.

[0016] The network management device 100 realizes, for example, each functional configuration as shown in Fig. 1 by executing a predetermined program on a computer included in the network management device 100. In the example of Fig. 1, the network management device 100 has each functional configuration such as a monitoring unit 101, an analyzing unit 102, a detecting unit 103, a notifying unit 104, a cell performance managing unit 105, and a cell information managing unit 106. Note that at least a part of each of the above functional configurations may be realized by hardware.

[0017] The monitoring unit 101 collects performance indicators such as wireless communication KPIs (Key Performance Indicators) from each wireless base station and the like constituting the wireless communication network. Here, the KPIs are key performance indicators defined for evaluating the performance of the wireless communication network. For example, KPIs defined in standards such as 3GPP TR38.913 can be applied as the KPIs. Furthermore, the monitoring unit 101 is not limited to KPIs defined in standards, and may collect other performance indicators of the wireless communication network.

[0018] The analysis unit 102 executes an analysis process for analyzing the performance indicators of the wireless communication network collected by the monitoring unit 101. For example, the analysis unit 102 calculates another performance indicator, such as the number of incoming handovers between wireless areas (cells), the number of outgoing handovers, or the total number of alternating handovers, based on the performance indicators of the wireless communication network collected by the monitoring unit 101.

[0019] The detection unit 103 executes a detection process to detect a wireless area (hereinafter referred to as a first wireless area) in which an abnormality related to the upper service is predicted to occur, based on the value of a performance index of the wireless communication network linked with the upper service. For example, the detection unit 103 sets a threshold value of a danger zone of a maintenance system (fault, performance) KPI for each wireless area (cell) and detects an excess of the threshold value to detect a wireless area (hereinafter referred to as a first wireless area) in which an abnormality related to the upper service is predicted to occur. Alternatively, the detection unit 103 detects a first wireless area in which an abnormality related to the upper service is predicted to occur, based on time-series data of the performance index of the wireless communication network.

[0020] The notifying unit 104 executes a notification process to notify the service management system 10, which manages higher-level services, of information about the first wireless area detected by the detecting unit 103. For example, the notifying unit 104 notifies the service management system 10 of information indicating that an abnormality is predicted to occur in the first wireless area and information for specifying the first wireless area (e.g., identification information of the wireless area or identification information of the wireless base station). Alternatively, the notifying unit 104 may notify the service management system 10 of more specific information about the first wireless area, such as, for example, "it is necessary to reduce mobility heading toward the first wireless area within five minutes."

[0021] The cell performance management unit 105 executes a cell performance management process for managing information related to the performance of a wireless area (cell). The information managed by the cell performance management unit 105 includes, for example, an upper limit value 201 of the number of UEs (User Equipment) in each wireless area (Cell Area), as shown in Fig. 2. The example in Fig. 2 indicates that cell area A can currently accommodate up to 100,000 UEs. Note that this upper limit value may be variable over time.

[0022] The cell information management unit 106 executes a cell information management process for managing information about wireless areas (cells). The information managed by the cell information management unit 106 includes, for example, the current number of UEs 202 in each wireless area (cell area), as shown in Fig. 2. The example in Fig. 2 indicates that at time t = 0, 95,000 UEs are accommodated in cell area A.

[0023] The functional configuration of the network management device 100 shown in FIG. 1 is an example. For example, the analysis unit 102 and the detection unit 103 may be a single functional component (e.g., a detection unit). Also, the cell performance management unit 105 and the cell information management unit 106 may be a single functional component (e.g., a cell information management unit). Furthermore, each functional component of the network management device 100 may be distributed across multiple devices.

[0024] <Processing Flow> Next, the processing flow of the network management method according to this embodiment will be described.

[0025] For example, in mobility services such as autonomous driving, safety during automatic operation is ensured by remote monitoring from a control center. In this case, if an abnormality occurs in the wireless communication network that links with the mobility service, the abnormality may have a negative impact on the mobility service.

[0026] Therefore, the information processing system 1 of this embodiment notifies the service management system 10 of information about the first wireless area in which an abnormality related to a higher-level service is predicted to occur, for example, by executing processing such as that shown in Figures 3 to 9.

[0027] This enables the service management system 10 to quickly take control of mobility heading towards the first wireless area to prevent accidents, such as changing the route, stopping automatic driving, or remote driving.

[0028] 3 is a flowchart illustrating an example of processing performed by an information processing system according to Example 1. This processing is an example of processing performed by the information processing system 1 described with reference to FIG.

[0029] In step S301, the monitoring unit 101 of the network management device 100 collects KPI values ​​of the wireless communication system that cooperates with the upper-level service. For example, the monitoring unit 101 collects KPI values ​​of each wireless area from wireless base stations that constitute each wireless area of ​​the wireless communication system. Note that the KPIs are an example of performance indicators of the wireless communication network.

[0030] In step S302, the detection unit 103 of the network management device 100 detects a first wireless area where an abnormality related to a higher-level service is predicted to occur, based on the value of the KPI of the wireless communication network. For example, the detection unit 103 sets a threshold value of a danger zone of a maintenance-related (failure, performance) KPI for each wireless area. Furthermore, the detection unit 103 detects, for example, a first wireless area 402 among multiple wireless areas 401, in which the value of the KPI exceeds the threshold value, as shown in FIG. 4 .

[0031] In step S303, the notification unit 104 of the network management device 100 notifies the service management system 10 of information about the detected first wireless area. For example, the notification unit 104 notifies the service management system 10 of information indicating that an abnormality is predicted to occur in the first wireless area (pre-abnormality information) and information for identifying the first wireless area (for example, identification information of the wireless area or identification information of the wireless base station).

[0032] In step S304, the service management system 10 executes accident prevention control on mobility heading toward the first wireless area and mobility currently driving autonomously within the first wireless area based on the information on the first wireless area notified by the network management device 100. For example, the service management system 10 transmits emergency commands such as route change, automatic driving suspension, or remote driving suspension to mobility heading toward the first wireless area and mobility currently driving autonomously within the first wireless area. Preferably, the service management system 10 excludes mobility heading outside the first wireless area from the accident prevention control among mobility currently driving autonomously within the first wireless area.

[0033] By repeatedly executing the process of FIG. 3, the information processing system 1 can prevent failures in higher-level services caused by abnormalities occurring in the wireless communication network.

[0034] [Example 2] Fig. 5 is a flowchart showing an example of processing of an information processing system according to Example 2. This processing shows another example of processing executed by, for example, the information processing system 1 described in Fig. 1. Note that the basic processing content is similar to the processing of the information processing system according to Example 1 described in Fig. 3, and therefore detailed description of the processing content similar to that of Example 1 will be omitted here.

[0035] In step S501, the monitoring unit 101 of the network management device 100 collects KPI values ​​of the wireless communication system that cooperates with the upper level service.

[0036] In step S502, the detection unit 103 of the network management device 100 detects a first wireless area in which an abnormality related to a higher-level service is predicted to occur and a second wireless area adjacent to the first wireless area, based on the value of the KPI of the wireless communication network. For example, the detection unit 103 sets a threshold value for a danger zone of a maintenance-related (failure, performance) KPI for each wireless area. Furthermore, the detection unit 103 detects, for example, a first wireless area 402, among multiple wireless areas 401, in which the KPI value exceeds the threshold value, as shown in FIG. 6 . Furthermore, the detection unit 103 detects a second wireless area 601, among the multiple wireless areas 401, adjacent to the first wireless area 402.

[0037] In step S503, the notification unit 104 of the network management device 100 notifies the service management system 10 of information on the detected first wireless area and second wireless area. For example, the notification unit 104 notifies the service management system 10 of information indicating that an abnormality is predicted to occur in the first wireless area, information identifying the first wireless area, information identifying the second wireless area adjacent to the first wireless area, etc.

[0038] In step S504, the service management system 10 executes accident prevention control for mobility heading toward the first wireless area and mobility currently driving autonomously within the first wireless area, based on the information on the first wireless area and the second wireless area notified by the network management device 100. For example, the service management system 10 transmits emergency commands such as route change, automatic driving suspension, or remote driving suspension to mobility heading toward the first wireless area and mobility currently driving autonomously within the first wireless area. Preferably, the service management system 10 excludes mobility currently driving autonomously within the first wireless area that leaves the first wireless area from the accident prevention control.

[0039] The service management system 10 may instruct a mobility that is autonomously driving in the first wireless area to perform more urgent accident prevention control (e.g., route change, suspension of autonomous driving, remote suspension of driving, etc.). Furthermore, the service management system 10 may perform less urgent accident prevention control (e.g., notification of warning information, etc.) for a mobility that is heading toward the first wireless area and is in the second wireless area. For example, the service management system 10 may warn a mobility that is in the second wireless area not to head in that direction by indicating the current location of the mobility or the direction from the current wireless area to the first wireless area.

[0040] By repeatedly executing the process of FIG. 5, the information processing system 1 can prevent failures (including accidents) in higher-level services caused by abnormalities occurring in the wireless communication network.

[0041] Third Embodiment In a third embodiment, an example will be described in which a first wireless area where an abnormality is predicted to occur within a predetermined time is detected based on the number of incoming and outgoing handovers between wireless areas.

[0042] 7 is a diagram illustrating an outline of processing in an information processing system according to a third embodiment. The network management device 100 analyzes handover interactions between wireless areas as a performance indicator of a wireless communication network (step S1). For example, the analysis unit 102 of the network management device 100 calculates the number of handover interactions between each wireless area from the number of inflows and outflows of handovers between wireless areas.

[0043] Furthermore, the detection unit 103 of the network management device 100 detects a first wireless area where an abnormality is predicted to occur within a predetermined time based on the number of handover exchanges calculated by the analysis unit 102 (step S2).

[0044] Next, the notification unit 104 of the network management device 100 notifies the service management system 10 of information about the first wireless area detected by the detection unit 103. For example, the notification unit 104 notifies the service management system 10 that it is necessary to reduce mobility toward the first wireless area within a predetermined time.

[0045] In response to this notification, the service management system 10 controls the mobility 703 heading toward the first wireless area and the mobility 703 that is autonomously driving within the first wireless area, for example, by changing the route, stopping the autonomous driving, or remotely stopping the driving, etc. This makes it possible to prevent or suppress accidents and the like that occur in the first wireless area due to the number of UEs exceeding the upper limit.

[0046] <Processing Flow> Fig. 8 is a flowchart showing an example of processing of the information processing system according to Example 3. Note that detailed description of processing similar to that of Examples 1 and 2 will be omitted here.

[0047] In step S801, the analysis unit 102 of the network management device 100 executes an analysis process for analyzing handover interactions in each wireless area.

[0048] 9 is a diagram illustrating an example of an analysis process according to the third embodiment. This diagram illustrates an example of a process in which the analysis unit 102 analyzes handover exchanges between wireless areas in a wireless area A. The analysis unit 102 calculates an added UE number to A / min 901, which is the difference between the number of incoming handovers per minute (Incoming handover to A / min) 701 entering the wireless area A from an adjacent area and the number of outgoing handovers per minute (Outgoing handover from A / min) 702 leaving the wireless area A to an adjacent area. The analysis unit 102 also adds up the number of incoming handovers per minute 901 with each adjacent area to calculate a total added UE number to A / min 902 for the wireless area A.

[0049] Similarly, the analysis unit 102 calculates the total number of AC handovers per minute for each wireless area included in the wireless communication network. If the value of the total number of AC handovers per minute for this wireless area is positive, it indicates that the number of UEs accommodated in the wireless area is increasing. If the value of the total number of AC handovers per minute for the wireless area is negative, it indicates that the number of UEs accommodated in the wireless area is decreasing.

[0050] 8, the description of the flowchart will be continued. In step S802, the detection unit 103 of the network management device 100 detects a first wireless area in which the number of UEs is predicted to exceed an upper limit within a predetermined time. For example, the detection unit 103 calculates a predicted time T until the number of UEs in the wireless area A reaches the upper limit based on the total added UE number to A / min 902, the current upper limit of number of UEs in the wireless area A 201, and the current number of UEs in the wireless area A 202, which are described in FIG. 2.

[0051] For example, the detection unit 103 calculates a predicted time T (minutes) from time t=1 until the number of UEs in the wireless area A reaches the upper limit value using the linear extrapolation formula shown in the following formula (1).

[0052] For example, if the total number of AC handovers per minute in wireless area A is "1,000," the upper limit of the number of UEs in wireless area A is "100,000," and the current number of UEs in wireless area A is "95,000," then T = (100,000 - 95,000) / 1,000 (per min.) = 5 min.

[0053] Similarly, the detection unit 103 calculates a predicted time T until the number of UEs reaches the upper limit in each wireless area of ​​the wireless communication network.

[0054] The detection unit 103 detects a first wireless area in which the number of UEs is predicted to exceed the upper limit within a predetermined time from the calculated predicted time T before the number of UEs in each wireless area reaches the upper limit. Note that this process is an example of a process for detecting a first wireless area in which an abnormality related to the upper service is predicted to occur, based on the value of a performance index of the wireless communication network linked with the upper service. Also, the predetermined time is an example of a threshold for detecting the first wireless area.

[0055] In step S803, the notification unit 104 of the network management device 100 notifies the service management system 10 of information about the first wireless area detected by the detection unit 103. For example, assume that wireless area A is the first wireless area where the number of UEs is predicted to exceed an upper limit within a predetermined time. In this case, the notification unit 104 notifies, for example, that "mobility toward wireless area A needs to be reduced promptly within five minutes." More precisely, the notification unit 104 notifies that "the number of mobility inflows into wireless area A needs to be reduced below the number of mobility outflows. If this is difficult, it is necessary to slow down and stop mobility communication within wireless area A in advance so that communication can be disconnected after five minutes." Here, "five minutes" is the predicted time T until the number of UEs in wireless area A reaches an upper limit, calculated using equation (1). This notification is an example of information for suppressing mobility inflows into the first wireless area.

[0056] In step S804, the service management system 10 suppresses the inflow of mobility into the first wireless area based on the information notified from the network management device 100. For example, the service management system 10 suppresses the inflow of mobility into the first wireless area by performing control such as changing the route of mobility heading toward the first wireless area, or by stopping automatic driving and switching to remote driving.

[0057] By the process of FIG. 8, the information processing system 1 can prevent or suppress accidents caused by the number of UEs in a wireless area exceeding the upper limit.

[0058] 8 is an example. For example, in step S803, the notification unit 104 may notify the service management system 10 of information indicating that an abnormality is predicted to occur in the first wireless area, information for identifying the first wireless area, etc., as in the first embodiment. Alternatively, the notification unit 104 may notify the service management system 10 of information on the first wireless area and the second wireless area, as in the second embodiment.

[0059] <Hardware Configuration> The network management device 100 has, for example, the hardware configuration of a computer 1000 as shown in Fig. 10. Alternatively, the network management device 100 is realized by a plurality of computers 1000. Furthermore, the service management system 10 is realized by one or more computers 1000.

[0060] 10 is a diagram showing an example of the hardware configuration of a computer according to this embodiment. In the example of Fig. 10, a computer 1000 includes a processor 1001, a memory 1002, a storage device 1003, a communication device 1004, an input device 1005, an output device 1006, and a bus B.

[0061] The processor 1001 is, for example, an arithmetic unit such as a CPU (Central Processing Unit) that executes predetermined programs to realize various functions. The memory 1002 is a storage medium readable by the computer 1000, and includes, for example, a RAM (Random Access Memory) and a ROM (Read Only Memory). The storage device 1003 is a computer-readable storage medium, and includes, for example, a HDD (Hard Disk Drive), an SSD (Solid State Drive), various optical disks, and a magneto-optical disk.

[0062] The communication device 1004 includes one or more pieces of hardware (communication devices) for communicating with other devices via a wireless or wired network. 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., an input / output device such as a touch panel display).

[0063] The bus B is commonly connected to the above components and transmits, for example, address signals, data signals, and various control signals. The processor 1001 is not limited to a CPU, and may be, for example, a DSP (Digital Signal Processor), a PLD (Programmable Logic Device), or an FPGA (Field Programmable Gate Array).

[0064] (Supplementary Note) The network management device 100 and the service management system 10 in this embodiment are not limited to being realized by dedicated devices, but may also be realized by a general-purpose computer. In this case, a program for realizing this function may be recorded on a computer-readable recording medium, and the program recorded on this recording medium may be read into a computer system and executed. Note that the term "computer system" here includes the OS (Operating System) and hardware such as peripheral devices.

[0065] Furthermore, "computer-readable recording medium" includes various storage devices such as portable media such as flexible disks, optical magnetic disks, ROMs, CD-ROMs, and storage devices built into computer systems. Furthermore, "computer-readable recording medium" may also include devices that dynamically store a program for a short period of time, such as a communication line when transmitting a program via a network such as the Internet or a communication line such as a telephone line, and devices that store a program for a certain period of time, such as volatile memory within a computer system that serves as a server or client in such cases.

[0066] Furthermore, the above program may be one that realizes part of the functions described above, or may be one that can realize the functions described above in combination with a program already recorded in a computer system, or may be one that is realized using hardware such as a PLD or FPGA.

[0067] <Effects of the embodiment> According to the present embodiment, in an information processing system in which a higher-level service and a wireless communication network cooperate to provide services, it is possible to prevent a failure (including an accident) in the higher-level service due to an abnormality occurring in the wireless communication network.

[0068] For example, in a wireless communication network linked with a higher-level service, the network management device 100 according to this embodiment notifies the service management system 10 that provides the higher-level service of information about a first wireless area in which an abnormality related to the higher-level service is predicted to occur. This enables the service management system 10 to perform control to prevent or suppress the occurrence of an accident in the higher-level service.

[0069] Summary of Embodiments This specification discloses at least the network management device, network management method, and program of the following paragraphs. (1) A network management device having: a detection unit that detects a wireless area in which an abnormality related to a higher-level service linked with a wireless communication network is predicted to occur; and a notification unit that notifies a service management system that manages the higher-level service of information about the wireless area. (2) The network management device of paragraph 1, in which the detection unit detects the wireless area in which the abnormality is predicted to occur based on a KPI value of the wireless communication network. (3) The network management device of paragraph 1, in which the detection unit detects the wireless area in which the abnormality is predicted to occur within a predetermined time based on the number of inflows and outflows of handovers between wireless areas. (4) The network management device of paragraph 3, in which the detection unit detects the wireless area in which the number of UEs is predicted to exceed an upper limit value within a predetermined time. (5) The network management system of paragraph 3 or 4, in which the information about the wireless area includes a predicted time until the number of UEs in the wireless area exceeds an upper limit value. (Clause 6) The network management device according to any one of clauses 1 to 4, wherein the higher-level service includes a mobility service, and the information relating to the wireless area includes information for suppressing an inflow of mobility into the wireless area. (Clause 7) The network management device according to any one of clauses 1 to 6, wherein the notification unit further notifies the service management system of information relating to adjacent wireless areas adjacent to the wireless area. (Clause 8) A program, or a storage medium having a program stored thereon, that causes a computer to execute a detection process for detecting a wireless area in which an abnormality related to a higher-level service linked with a wireless communication network is predicted to occur, and a notification process for notifying a service management system that manages the higher-level service of information relating to the wireless area.

[0070] Although the present embodiment has been described above, the present invention is not limited to such a specific embodiment, and various modifications and changes are possible within the scope of the gist of the present invention described in the claims.

[0071] REFERENCE SIGNS LIST 1 Information processing system 10 Service management system 100 Network management device 101 Monitoring unit 102 Analysis unit 103 Detection unit 104 Notification unit 402 First wireless area 703 Mobility 1000 Computer

Claims

1. A network management device comprising: a detection unit that detects a wireless area in which an abnormality related to a higher-level service associated with a wireless communication network is predicted to occur; and a notification unit that notifies information regarding the wireless area to a service management system that manages the higher-level service.

2. The network management device according to claim 1, wherein the detection unit detects the wireless area in which the abnormality is predicted to occur based on a value of a KPI of the wireless communication network.

3. The network management device according to claim 1, wherein the detection unit detects the wireless area in which the abnormality is predicted to occur within a predetermined time based on the number of inflows and outflows of handovers between wireless areas.

4. The network management device according to claim 3, wherein the detection unit detects the wireless area in which the number of UEs is predicted to exceed an upper limit value within a predetermined time.

5. The network management device according to claim 3 or 4, wherein the information regarding the wireless area includes a predicted time until the number of UEs in the wireless area exceeds an upper limit value.

6. The network management device according to claim 1 or 2, wherein the higher-level service includes a mobility service, and the information regarding the wireless area includes information for suppressing the inflow of mobility into the wireless area.

7. The network management device according to claim 1, wherein the notification unit further notifies the service management system of information regarding an adjacent wireless area adjacent to the wireless area.

8. A program for causing a computer to execute: a detection process of detecting a wireless area in which an abnormality related to a higher-level service associated with a wireless communication network is predicted to occur; and a notification process of notifying information regarding the wireless area to a service management system that manages the higher-level service.

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