Network management device and wireless communication system

Abstract

In order to make it possible to suppress entry of UE to a wireless area in which occurrence of an abnormality is predicted in a wireless communication network, this network management device has: a detection unit that detects a wireless area in which occurrence of an abnormality is predicted; and a transmission unit that transmits control information for instructing stoppage of entry of UE to the wireless area in which occurrence of an abnormality is predicted.

Description

Network management device and wireless communication system

[0001] The present invention relates to a network management device and a wireless communication system.

[0002] There is an information processing system that provides a predetermined service in cooperation with a higher-level service and a communication network.

[0003] Also, there is known a technique in which a handover of a UE (User Equipment) to a neighboring cell is rejected on the side of the current accommodating cell (see, for example, Non-Patent Documents 1 and 2).

[0004] 3GPP TS 36.300 V18.0.0, "Evolved Universal Terrestrial Radio Access (E-UTRA) and Evolved Universal Terrestrial Radio Access Network (E-UTRAN); Overall description; Stage 2",<URL: https: / / www.3gpp.org / ftp / Specs / archive / 36_series / 36.300 / 36300-i00.zip > 3GPP TS 38.300 V18.0.0, "NR; NR and NG-RAN Overall description; Stage 2",<URL: https: / / www.3gpp.org / ftp / Specs / archive / 38_series / 38.300 / 38300-i00.zip >

[0005] For example, in a mobility-related upper service such as an autonomous driving service, safety in the autonomous driving service is ensured by remote monitoring from a control center, etc. Therefore, for example, if an abnormality occurs in a wireless communication network that cooperates with the upper service, a failure may also occur in the mobility-related upper service. Therefore, in such a system, it is desirable to suppress the inflow of UEs into a wireless area where an abnormality is predicted, such as the number of accommodated UEs being in a dangerous range.

[0006] The techniques disclosed in Non-Patent Documents 1 and 2 make it possible to reject handover itself, but they do not prevent UEs from entering a wireless area where an abnormality is predicted to occur (the locational movement of UEs into that wireless area).

[0007] An embodiment of the present invention has been made in consideration of the above-mentioned problems, and makes it possible to suppress the inflow of UEs into a wireless area in which an abnormality is predicted to occur in a wireless communication network.

[0008] 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 is predicted to occur, and a transmission unit that transmits control information instructing UEs to stop entering the wireless area in which the abnormality is predicted to occur.

[0009] According to one embodiment of the present invention, in a wireless communication network, it becomes possible to suppress the inflow of UEs into a wireless area where the occurrence of an abnormality is predicted.

[0010] 1 is a diagram illustrating an example of the configuration of a wireless communication system according to the present embodiment; FIG. 2 is a flowchart illustrating an example of processing in a wireless communication system according to Example 1; FIG. 3 is a diagram illustrating an example of setting an evacuation direction according to Example 2; FIG. 4 is a diagram illustrating an example of setting an evacuation direction according to Example 2; FIG. 5 is a diagram illustrating an example of setting an evacuation direction according to Example 2; FIG. 6 is a sequence diagram illustrating an example of a handover initiation process in LTE; FIG. 7 is a sequence diagram illustrating an example of a handover rejection process in LTE according to the present embodiment; FIG. 8 is a sequence diagram illustrating an example of a handover initiation process in 5G; FIG. 9 is a sequence diagram illustrating an example of a handover rejection process in 5G according to the present embodiment; and FIG. 10 is a diagram illustrating an example of the hardware configuration of a computer.

[0011] 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.

[0012] 1 is a diagram showing an example of the configuration of a wireless communication system according to this embodiment. The wireless communication system 1 according to this embodiment includes, for example, a network management device 100, a mobility management node 10, a Radio Access Network (RAN) node 20, and a mobility 30.

[0013] The network management device (network management system) 100 is, for example, an information processing device having a computer configuration or a system including multiple computers. The network management device 100 manages a wireless communication network, such as LTE (Long Term Evolution) or 5G (5th Generation), which cooperates with higher-level mobility services such as autonomous driving. Preferably, the wireless communication network managed by the network management device 100 is a network that requires communication immediacy, such as local 5G or private 5G.

[0014] (Network Management Device) The network management device 100 realizes, for example, each functional configuration as shown in Fig. 1 by executing a predetermined program on a computer provided in the network management device 100. In the example of Fig. 1, the network management device 100 has a monitoring unit 101, an analyzing unit 102, a detecting unit 103, a determining unit 104, a transmitting unit 105, a cell performance managing unit 106, and a cell information managing unit 107. Note that at least a portion of each of the above functional configurations may be realized by hardware.

[0015] The monitoring unit 101 executes a monitoring process of collecting wireless communication KPI (Key Performance Indicator) values ​​from the wireless communication network managed by the network management device 100. For example, the monitoring unit 101 collects KPI values ​​(performance indicators) such as the number of UEs (User Equipment) accommodated by each RAN node 20 or the number of simultaneous UE connections.

[0016] The analysis unit 102 executes an analysis process for analyzing the values ​​of the KPIs of the wireless communication network collected by the monitoring unit 101. For example, the analysis unit 102 calculates indicators such as the number of incoming handovers between cells (wireless areas), the number of outgoing handovers, or the total number of AC handovers, based on the values ​​of the KPIs of the wireless communication network collected by the monitoring unit 101.

[0017] The detection unit 103 executes a detection process to detect a wireless area where an abnormality is predicted to occur (hereinafter referred to as a risk cell). For example, the detection unit 103 sets a risk threshold for a KPI (e.g., the number of accommodated UEs or the number of simultaneously connected UEs) for each wireless area, and detects a risk cell where an abnormality is predicted to occur by detecting an excess of the threshold. Alternatively, the detection unit 103 may detect a risk cell where an abnormality is predicted to occur based on an index analyzed by the analysis unit 102, time-series data of KPI values, or the like.

[0018] The determination unit 104 executes a determination process of determining to stop UEs from entering the risk cell from each neighboring cell of the risk cell detected by the detection unit 103, and creating control information instructing to stop UEs from entering the risk cell. Preferably, the control information created by the determination unit 104 includes information instructing a direction of evacuation for a UE that can be handed over to the risk cell.

[0019] The transmitter 105 executes a transmission process of transmitting control information instructing UEs to stop flowing into the risk cell. For example, the transmitter 105 transmits the control information determined by the determination unit 104 to the RAN node (neighboring cell) 20 of the neighboring cell adjacent to the risk cell via the mobility management node 10.

[0020] The cell performance management unit 106 executes a cell performance management process for managing information about the performance of a wireless area (cell). The information managed by the cell performance management unit 106 includes, for example, information about the upper limit of the number of UEs in each wireless area. Note that this upper limit may be variable over time.

[0021] The cell information management unit 107 executes a cell information management process for managing information about wireless areas (cells). The information managed by the cell information management unit 107 includes, for example, information about the current number of UEs in each wireless area.

[0022] 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 106 and the cell information management unit 107 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.

[0023] (Mobility Management Node) The mobility management node 10 has a forwarding unit 11 that receives control information from the network management device 100 and forwards the received control information to a RAN node 20 in a wireless area adjacent to the dangerous cell (hereinafter referred to as an adjacent cell).

[0024] (RAN Node) The RAN node 20 includes, for example, an antenna, a base station, and / or a line control device that form a wireless area (cell). The RAN node 20 has a computer configuration, and by executing a predetermined program on the computer, realizes, for example, each functional configuration as shown in Fig. 1. In the example of Fig. 1, the RAN node 20 has a control information receiving unit 21, a control information processing unit 22, a HO permission determining unit 23, a control information transmitting unit 24, etc.

[0025] The control information receiver 21 executes a control information reception process to receive control information, etc., that instructs UEs to stop entering a risk area cell, transmitted by the mobility management node 10. The control information processor 22 notifies the HO permission determiner 23, the control information transmitter 24, etc. of the control information received by the control information receiver 21.

[0026] The HO (Handover) HO feasibility determination unit 23 executes a HO feasibility determination process for determining whether to start handover processing for a UE. When the HO feasibility determination unit 23 receives control information or the like instructing to stop UEs from entering a risk cell from the control information processing unit 22, it denies (rejects) the start of handover processing for a subordinate UE that has entered the risk cell. Here, the subordinate UE is a UE connected to its own node (RAN node 20).

[0027] The control information transmitter 24 executes a control information transmission process to transmit the control information received from the control information processor 22 to the subordinate UE that has entered the dangerous area cell.

[0028] (Mobility) The mobility 30 is a mobility such as an automobile that includes a UE 35 that receives control information transmitted by the RAN node 20 and has an automatic driving function for selecting a route and moving based on the control information. Note that the mobility may include various moving devices other than automobiles, such as motorcycles, senior cars, or walking robots. Furthermore, the mobility may include various flying objects within the area that use the wireless communication network provided by the wireless communication system 1, such as drones, flying taxis, or flying cars.

[0029] The UE 35 is a mobile terminal that connects to the RAN node 20 and performs wireless communication. The UE 35 has a computer configuration, and by executing a predetermined program on the computer, the UE 35 realizes the functional configuration shown in Fig. 1. In the example of Fig. 1, the UE 35 has a control information receiving unit 31, a control information notifying unit 32, a handover processing unit 33, etc.

[0030] The control information receiver 31 executes a control information reception process to receive control information, such as control information instructing the UE to stop entering a dangerous cell, transmitted by the RAN node 20. The control information notifier 32 executes a control information notification process to notify the autonomous driving controller 34 and the like of the control information received by the control information receiver 31.

[0031] The handover processing unit 33 executes handover processing. For example, the handover processing unit 33 executes processing related to handover for switching the RAN node 20 with which the UE 35 performs wireless communication, in accordance with the standards disclosed in Non-Patent Document 1, Non-Patent Document 2, etc.

[0032] The autonomous driving control unit 34 executes an autonomous driving control process to control the positional movement of the mobility 30 so as not to move into the risk cell, based on control information instructing the UE to stop flowing into the risk cell, notified from the UE 35. Preferably, the autonomous driving control unit 34 selects a movement route based on the evacuation direction included in the control information notified from the UE 35, and controls the mobility 30 to move along the selected movement route.

[0033] 1 is an example. For example, the mobility 30 may be a UE 35 equipped with an autonomous driving control unit 34.

[0034] <Processing Flow> Next, the processing flow of the network management method according to this embodiment will be described.

[0035] 2 is a flowchart illustrating an example of processing performed by a wireless communication system according to Example 1. This processing illustrates an example of processing performed by the wireless communication system 1 described with reference to FIG.

[0036] In step S201, the monitoring unit 101 of the network management device 100 collects KPI values ​​of the wireless communication network provided by the wireless communication system 1. For example, the monitoring unit 101 collects KPI values ​​such as the number of accommodated UEs or the number of simultaneous UE connections from each RAN node 20 included in the wireless communication system 1.

[0037] In step S202, the detection unit 103 of the network management device 100 detects risk cells, which are wireless areas where an abnormality is predicted to occur, based on the KPI values ​​collected by the monitoring unit 101. For example, the detection unit 103 detects, as risk cells, wireless areas (cells) where a KPI value, such as the number of accommodated UEs or the number of simultaneous UE connections, exceeds a preset threshold. Alternatively, the detection unit 103 may detect risk cells where an abnormality is predicted to occur based on the index analyzed by the analysis unit 102, time-series data of the KPI values, or the like.

[0038] In step S203, the decision unit 104 of the network management device 100 decides to stop the inflow of UEs into the risk cell, and creates control information instructing the inflow of UEs into the risk cell to be stopped.

[0039] In step S204, the transmitting unit 105 of the network management device 100 transmits the control information created by the determining unit 104 to the mobility management node 10.

[0040] In step S205, the forwarding unit 11 of the mobility management node 10 receives the control information from the network management device 100, and forwards the received control information to the RAN node 20 of the neighboring cell that is adjacent to the risk cell.

[0041] 3 is a diagram showing an image of a risk cell and neighboring cells according to this embodiment. The detection unit 103 of the network management device 100 detects a wireless area in which the number of UEs 302 accommodated exceeds a threshold as a risk cell 301a. The forwarding unit 11 of the mobility management node 10 forwards control information to the RAN nodes 20 of neighboring cells 301b and 301c adjacent to the risk cell 301a.

[0042] In step S206, the RAN node 20 of the neighboring cell receives the control information transmitted by the mobility management node 10, rejects the handover decision for the subordinate UE that has entered the risk area cell, and transfers the control information. For example, the control information receiver 21 of the RAN node 20 of the neighboring cell receives the control information transmitted by the mobility management node 10. Furthermore, the control information processor 22 notifies the HO permission determiner 23, the control information transmitter 24, etc. of the control information received by the control information receiver 21.

[0043] As a result, the HO feasibility determination unit 23 denies the start of handover processing for the subordinate UE that has entered the risk cell. For example, in Fig. 3, in the RAN node 20 of the neighboring cell 301b, the HO feasibility determination unit 23 denies the start of handover processing for the subordinate UE 302x that has entered the risk cell 301a. As a result, the subordinate UE 302x cannot perform handover to the risk cell 301a.

[0044] In addition, in the RAN node 20 of the neighboring cell 301b, the control information transmitter 24 transmits the control information notified by the control information processor 22 to the subordinate UE 302x that has entered the risk area cell 301a.

[0045] In step S207, the mobility 30 including the UE 35 that has received the control information from the RAN node 20 suppresses inflow of the mobility 30 (UE 35) into a risk cell where an abnormality is predicted to occur, based on the received control information. For example, when the control information receiver 31 of the UE 35 receives control information instructing the UE to stop inflow of the UE into the risk cell, the control information notifier 32 notifies the autonomous driving control unit 34 of the received control information. As a result, the autonomous driving control unit 34 selects a movement route for the mobility 30 based on the notified control information so as to suppress inflow into the risk cell, and controls the mobility 30 to move along the selected movement route.

[0046] For example, the control information instructing the UE to stop entering the danger cell may include location information indicating the location of the danger cell, and the autonomous driving control unit 34 may change the travel route to avoid the location of the danger cell.

[0047] [Example 2] Fig. 4 is a flowchart showing an example of processing of a wireless communication system according to Example 2. This processing shows another example of processing executed by the wireless communication system 1 described in Fig. 1. Note that the basic processing content is similar to the processing of the wireless communication system according to Example 1 described in Fig. 2, and therefore detailed description of the processing content similar to that of Example 1 will be omitted here.

[0048] In step S401 , the monitoring unit 101 of the network management device 100 collects KPI values ​​of the wireless communication network provided by the wireless communication system 1 .

[0049] In step S402, the detection unit 103 of the network management device 100 detects a dangerous cell, which is a wireless area where an abnormality is predicted to occur, based on the KPI values ​​collected by the monitoring unit 101.

[0050] In step S403, the decision unit 104 of the network management device 100 decides to stop the UE from entering the risk cell, and creates control information instructing the UE to stop entering the risk cell, including data on the evacuation direction for each adjacent cell.

[0051] 5 to 7 are diagrams illustrating examples of setting the evacuation direction according to the second embodiment. For example, as shown in Fig. 5, the determination unit 104 calculates the directions of two tangent lines 504a and 504b at intersections 503a and 503b between an arc representing the boundary of a dangerous cell 501 and an arc representing the boundary of an adjacent cell 502. Note that when each wireless area (cell) is not dynamic but is operated in a fixed manner, the directions of the two tangent lines 504a and 504b can be calculated in advance and stored in a database or the like.

[0052] Furthermore, the determination unit 104 generates control information including information instructing the mobility 30a to move within the range of the directions of the two tangent lines 504a and 504b. As a result, for example, as shown in FIG. 6 , the mobility 30a having the UE 35 under the control of the neighboring cell 502 that has entered the risk cell 501 moves within the range of the two directions 601a and 601b. Therefore, the wireless communication system 1 can prevent the mobility 30a from entering the risk cell 501. Similarly, the mobility 30b having the UE 35 under the control of the neighboring cell 502 that has entered the risk cell 501 moves within the range of the two directions 602a and 602b. Therefore, the wireless communication system 1 can prevent the mobility 30a from entering the risk cell 501.

[0053] In addition, the determination unit 104 can also create control information that includes information instructing movement along a direction 701 from the center point of the danger area cell 501 toward the center point of the adjacent cell 502, as shown in Figure 7, for example.

[0054] 4, the description of the flowchart will be continued. In step S404, the transmitting unit 105 of the network management device 100 transmits the control information created by the determining unit 104 to the mobility management node 10.

[0055] In step S405, the forwarding unit 11 of the mobility management node 10 receives the control information from the network management device 100, and forwards the received control information to the RAN node 20 of the neighboring cell that is adjacent to the risk cell.

[0056] In step S406, the RAN node 20 of the neighboring cell receives the control information transmitted by the mobility management node 10, rejects the handover decision for the subordinate UE that has entered the risk area cell, and transfers the control information.

[0057] In step S407, the mobility 30 having the UE 35 that has received the control information from the RAN node 20 selects a movement route based on the direction of evacuation included in the received control information, and moves (evacuates).

[0058] 6, for example, assume that the mobility 30a includes a UE 35 that is under the control of a neighboring cell 502 and has entered a risk cell 501. In this case, the autonomous driving control unit 34 of the mobility 30a selects, from among multiple routes to the destination, a route that heads within the range of two directions 601a and 601b included in the control signal, and moves along the selected route. This allows the wireless communication system 1 to prevent the mobility 30a from entering the risk cell 501.

[0059] <Handover Rejection Processing> Next, an example of handover rejection processing in which the RAN node 20 of the neighboring cell rejects the start of handover processing, for example, in step S206 of FIG. 2 or step S406 of FIG. 4, will be described.

[0060] 8 is a sequence diagram showing an example of a handover initiation process in LTE. This process shows an example of a handover initiation process described in Non-Patent Document 1.

[0061] In step S801, "Area restriction Provided," the conditions for handover processing are notified.

[0062] In "Measurement Control" in step S802, the Source eNB812, which is the source radio base station, instructs the UE811, which is the radio mobile station, to measure the communication quality between the Source eNB812 and the UE811.

[0063] In step S803, "Measurement Reports", the UE811 transmits measurement results such as communication quality between the UE811 and the Source eNB812 to the Source eNB812.

[0064] In step S804, the Source eNB 812 determines whether to start or reject (reject) the handover process based on the measurement results of the communication quality between the UE 811 and the Source eNB 812, etc.

[0065] If the Source eNB 812 decides to start the handover process, the Source eNB 812 starts the handover process in step S804. Note that if the Source eNB 812 rejects the start of the handover process in step S804, the handover process in step S804 is not executed.

[0066] Fig. 9 is a sequence diagram showing an example of a handover rejection process in LTE according to this embodiment. In Fig. 9, an LTE MME (Mobility Management Entity) 805 corresponds to the mobility management node 10 described in Fig. 1. Also, a Source eNB 812 corresponds to the RAN node (neighboring cell) 29 described in Fig. 1.

[0067] In step S901, "Area restriction Provided," the conditions for handover processing are notified.

[0068] In step S902, the transmitting unit 105 of the network management device 100 transmits, to the MME 805, control information instructing the MME 805 to stop the inflow of UEs into the risk area cell.

[0069] In step S903, the MME 805 transfers the control information received from the network management device 100 to the Source eNB 812. As a result, the network management device 100 can control the Source eNB 812 to deny the initiation of handover processing for the UE 811 that can be handed over to the risk area cell.

[0070] In "Measurement Control" of step S904, the Source eNB 812 instructs the UE 811, which is a wireless mobile station, to measure the communication quality between the Source eNB 812 and the UE 811. In this embodiment, this "Measurement Control" includes part or all of the control information instructing the UE 811 to stop flowing into the dangerous area cell. Note that in Example 2, this "Measurement Control" includes information instructing the evacuation direction, which is included in the control information. This allows the network management device 100 to notify the UE 811 of the information instructing the evacuation direction.

[0071] In step S905, "Measurement Reports", the UE811 transmits measurement results of the communication quality between the UE811 and the Source eNB812 to the Source eNB812.

[0072] In step S804, the Source eNB812 rejects (denies) the start of the handover process based on the control information received from the MME815, regardless of the measurement results of the communication quality between the UE811 and the Source eNB812, etc.

[0073] As a result, the handover process shown in step S804 in Fig. 8 is not executed. By the process in Fig. 9, the wireless communication system 1 according to the present embodiment can suppress handover of the UE to a risky cell in the LTE network.

[0074] 10 is a sequence diagram showing an example of a handover initiation process in 5G. This process shows an example of a handover initiation process described in Non-Patent Document 2.

[0075] 10, an AMF (Access and Mobility Management Function) 1014 is a network function (NF) that manages access and UE movement in the 5G core network. Also, a UPF (User Plane Function)(s) 1015 is a NF that forwards user data packets in the 5G core network.

[0076] In step S1001, "Mobility control information Provided by AMF", the AMF 1014 notifies the conditions of the handover process, etc.

[0077] In step S1002, "Measurement Control and Report," Source gNB1012, which is the source radio base station, instructs UE1011, which is the radio mobile station, to measure communication quality, etc., and UE1011 reports the measurement results of communication quality, etc.

[0078] In step S1003, Source gNB1012 decides whether to start the handover process or reject (reject) it based on the measurement results of communication quality between UE1011 and Source gNB1012.

[0079] If Source gNB1012 decides to start the handover process, it starts the handover process in step S1004. Note that if Source gNB1012 rejects the start of the handover process in step S1004, the handover process in step S1004 is not executed.

[0080] 11 is a sequence diagram showing an example of a handover rejection process in 5G according to this embodiment. It is assumed that the AMF 1014 of the 5G core network shown in FIG. 11 has the function of the mobility management node 10 described in FIG. 1. It is also assumed that the Source gNB 1012 in FIG. 11 corresponds to the RAN node (neighboring cell) 20 described in FIG.

[0081] In step S1101, "Mobility control information Provided by AMF", the AMF 1014 notifies the conditions of the handover process, etc.

[0082] In step S1102, the transmitting unit 105 of the network management device 100 transmits control information to the AMF 1014 to instruct the AMF 1014 to stop the inflow of UEs into the risk area cell.

[0083] In step S1103, the AMF 1014 forwards the control information received from the network management device 100 to the Source gNB 1012. As a result, the network management device 100 can control the Source gNB 1012 to deny the initiation of handover processing for the UE 1011 that can be handed over to the risk area cell.

[0084] In step S1104, "Measurement Control and Report," Source gNB1012, which is the source radio base station, instructs UE1011, which is the radio mobile station, to measure communication quality, etc., and UE1011 reports the measurement results of communication quality, etc. In Example 2, at this time, Source gNB1012 notifies UE1011 of information indicating the evacuation direction contained in the control information. This allows network management device 100 to notify UE1011 of the information indicating the evacuation direction.

[0085] In step S1105, Source gNB1012 rejects (denies) the start of handover processing based on control information received from AMF1014, regardless of measurement results such as communication quality between UE1011 and Source gNB1012.

[0086] As a result, the handover process shown in step S1004 in Fig. 10 is not executed. By the process in Fig. 11, the wireless communication system 1 according to the present embodiment can suppress handover of the UE to a risky cell even in a 5G network.

[0087] Although application examples to LTE and 5G wireless communication networks have been described here, the present invention is not limited to LTE and 5G, and can also be applied to wireless communication networks of generations after 5G, for example.

[0088] <Hardware Configuration> The network management device 100, the mobility management node 10, the RAN node 20, the UE 35, the mobility 30, and the like each have the hardware configuration of a computer 1200 as shown in Fig. 12. Note that each of the above devices may be realized by a plurality of computers 1200. Furthermore, the computer 1200 is not limited to a physical machine, and may be, for example, a virtual machine on a cloud.

[0089] Fig. 12 is a diagram showing an example of the hardware configuration of a computer according to this embodiment. In the example of Fig. 12, a computer 1200 includes a processor 1201, a memory 1202, a storage device 1203, a communication device 1204, an input device 1205, an output device 1206, and a bus B.

[0090] The processor 1201 is, for example, an arithmetic unit such as a CPU (Central Processing Unit) that executes predetermined programs to realize various functions. The memory 1202 is a storage medium readable by the computer 1200, and includes, for example, a RAM (Random Access Memory) and a ROM (Read Only Memory). The storage device 1203 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.

[0091] The communication device 1204 includes one or more pieces of hardware (communication devices) for communicating with other devices via a wireless or wired network. The input device 1205 is an input device (e.g., a keyboard, a mouse, a microphone, a switch, a button, a sensor, etc.) that accepts input from the outside. The output device 1206 is an output device (e.g., a display, a speaker, an LED lamp, etc.) that outputs to the outside. Note that the input device 1205 and the output device 1206 may be integrated into one device (e.g., an input / output device such as a touch panel display).

[0092] The bus B is commonly connected to the above components and transmits, for example, address signals, data signals, and various control signals. The processor 1201 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).

[0093] (Supplementary Note) Each device in this embodiment may be realized not only by a dedicated device but also by a general-purpose computer. In this case, a program for realizing the function may be recorded on a computer-readable recording medium, and the program recorded on the recording medium may be read into a computer system and executed. Note that the term "computer system" here includes an operating system (OS) and hardware such as peripheral devices.

[0094] 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.

[0095] 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.

[0096] <Effects of the embodiment> According to the present embodiment, in a wireless communication network, it becomes possible to suppress the inflow of UEs into a wireless area where an abnormality is predicted to occur.

[0097] For example, according to this embodiment, the inflow of UEs or mobility including UEs into a cell where the number of accommodated UEs is in a dangerous range can be suppressed by a direct instruction from the network management device and the network, regardless of whether or not the upper service control has the ability to solve the problem of preventing UEs from entering. Furthermore, according to Example 2, it is possible to accurately instruct the specific direction in which UEs or mobility including UEs should evacuate.

[0098] Summary of Embodiments This specification discloses at least the network management device, wireless communication system, network management method, and program of the following paragraphs. (Item 1) A network management device having: a detection unit that detects a wireless area where an abnormality is predicted to occur; and a transmission unit that transmits control information instructing UEs to stop entering the wireless area where the abnormality is predicted to occur. (Item 2) The network management device according to paragraph 1, wherein the control information includes information instructing a UE that can be handed over to the wireless area to take an evacuation direction. (Item 3) A wireless communication system including: the network management device according to paragraph 1 or 2; and a mobility management node that receives the control information from the network management device and forwards the control information to a RAN node in an adjacent wireless area adjacent to the wireless area. (Item 4) A wireless communication system including: the network management device according to paragraph 2; and mobility having an autonomous driving function that is equipped with a UE that receives the control information and that selects a travel route based on the evacuation direction included in the control information and moves. (Clause 5) A network management method in which a computer executes the following processes: detecting a wireless area in which an abnormality is predicted to occur; and transmitting control information instructing UEs to stop entering the wireless area in which the abnormality is predicted to occur. (Clause 6) A program for causing a computer to execute the network management method described in clause 5, or a storage medium storing the program.

[0099] 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.

[0100] REFERENCE SIGNS LIST 1 wireless communication system 10 mobility management node 11 forwarding unit 20 RAN node 22 control information processing unit 30 mobility 32 control information notification unit 34 automatic driving control unit 35 UE 100 network management device 101 monitoring unit 102 analysis unit 104 determination unit 105 transmission unit

Claims

1. A network management device having: a detection unit that detects a wireless area where an abnormality is predicted to occur; and a transmission unit that transmits control information that instructs UEs to stop entering the wireless area where the abnormality is predicted to occur.

2. A network management device according to claim 1, wherein the control information includes information instructing a UE that can be handed over to the wireless area in a direction to retreat.

3. A wireless communication system comprising: a network management device according to claim 1 or 2; and a mobility management node that receives the control information from the network management device and transfers the control information to a RAN node in an adjacent wireless area adjacent to the wireless area.

4. A wireless communication system comprising: a network management device according to claim 2; and a mobility having an automatic driving function that is equipped with a UE that receives the control information and selects a travel route based on the evacuation direction included in the control information and moves.

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