JP2019016904A - Radio communication system, management station, mobile base station and mobile base station control method - Google Patents

Abstract

To provide a mobile base station, management station, radio communication system and mobile base station control method, capable of increasing mobile base stations in real time against access concentration onto a mobile base station installed on a mobile.SOLUTION: A radio communication system 1 includes: a plurality of mobile base stations 10 installed on a mobile; a management station 20 which acquires information on a communication traffic volume of a plurality of mobile base stations 10 and determines necessity of the movement of the mobile base station 10 on the basis of the communication traffic volume.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a radio communication system, a management station, a mobile base station, and a mobile base station control method.

  As for mobile base stations, the types installed in automobiles are already being put to practical use or being tested for practical use, but roads are severed due to disasters, places such as mountainous areas, lake surfaces, and the sea where it is difficult to lay roads Cannot be installed, and there is a problem that it is delayed to move to the destination due to traffic congestion.

  Therefore, for example, a mobile base station mounted on an unmanned airplane called a drone as disclosed in Patent Document 1 has been proposed. The mobile base station disclosed in Patent Document 1 is mounted on a movable mobile body, for example, an aircraft, and performs data transmission with a base station application device. The moving body is, for example, a radio controlled or GPS (Global Positioning System) navigation type unmanned aerial vehicle (drone). In addition, the mobile base station performs data transmission by wireless communication with the terminal station.

International Publication No. 2016/135947

  If there are more mobile terminals that access the base station than the number of base stations, communication becomes difficult due to concentration of access to the base station. In this case, it is desired to increase the number of radio base stations in real time with respect to concentration of access to the base stations. However, Patent Document 1 does not disclose a configuration in which radio base stations can be added in real time with respect to concentration of access to base stations.

  An object of the present invention is to provide a radio communication system, a management station, a mobile base station, and a mobile base that can add mobile base stations in real time with respect to concentration of access to mobile base stations mounted on the mobile It is to provide a station control method.

  A wireless communication system according to an aspect of the present invention includes a plurality of mobile base stations mounted on a mobile body and information on the traffic volume of the plurality of mobile base stations, and the mobile base station based on the traffic volume And a management station for determining whether or not to move.

  According to another aspect of the present invention, a management station includes an information acquisition unit that acquires information related to a traffic volume of a plurality of mobile base stations mounted on a mobile body, and a plurality of mobile base stations based on the traffic volume. A movement necessity determination unit that determines whether movement is necessary.

  According to still another aspect of the present invention, a mobile base station includes: an information acquisition unit that acquires information regarding a traffic volume of a plurality of mobile base stations mounted on the mobile body; and the plurality of mobile bodies based on the traffic volume. A movement necessity determination unit that determines whether the base station needs to move.

  According to still another aspect of the present invention, there is provided a mobile base station control method that acquires information related to a traffic volume of a plurality of mobile base stations mounted on a mobile body, and the plurality of mobile base stations based on the traffic volume. It is determined whether or not to move.

  ADVANTAGE OF THE INVENTION According to this invention, a mobile base station can be expanded in real time with respect to the access concentration to the mobile base station mounted in a mobile body.

FIG. 1 is a diagram illustrating a schematic configuration of a wireless communication system according to the first embodiment. FIG. 2 is a flowchart showing the operation of the first embodiment. FIG. 3 is a diagram illustrating a schematic configuration of a wireless communication system according to the second embodiment. FIG. 4 is a block diagram showing a configuration of the flying mobile base station of FIG. FIG. 5 is a block diagram showing the configuration of the management station of FIG. FIG. 6 is a diagram illustrating an example of a change in traffic. FIG. 7 is a diagram illustrating an example of a change in communication amount and determination of movement in two communication areas. FIG. 8 is a flowchart showing the flying mobile base station control operation of the second embodiment. FIG. 9 is a block diagram showing the configuration of the flying mobile base station according to the third embodiment. FIG. 10 is a block diagram illustrating a configuration of the management station according to the third embodiment. FIG. 11 is a flowchart showing a schematic operation of the third embodiment. FIG. 12 is a flowchart showing the flying mobile base station control operation of the third embodiment.

  Next, a first embodiment of the present invention will be described with reference to the drawings.

  FIG. 1 is a diagram illustrating a schematic configuration of a wireless communication system according to a first embodiment of this invention. As shown in FIG. 1, the wireless communication system 1 of this embodiment includes a plurality of mobile base stations 10 and a management station 20 that are mounted on a mobile body. The management station 20 acquires information regarding the traffic volume of the plurality of mobile base stations 10. Further, it is determined whether or not the mobile base station 10 needs to be moved based on the acquired traffic of the mobile base stations 10.

  FIG. 2 is a flowchart showing the operation of the first embodiment. The management station 20 first acquires information related to the traffic volume of the plurality of mobile base stations 10 (step S1). Next, it is determined whether or not the mobile base station 10 needs to be moved based on the acquired traffic of the mobile base stations 10 (step S2). For example, if access concentration in the area is recognized from the information regarding the traffic obtained from the mobile base station 10, it is determined that the movement is necessary.

  If it is determined in step S2 that movement is necessary, the management station 20 transmits a movement command to the mobile base station 10 (step S3). For example, the management station 101 selects a mobile base station 10 with a small communication amount or a mobile base station 10 that is not in operation from information on the communication amount acquired from the active mobile base station 10.

  The mobile base station 10 that has received the movement command moves according to the movement command (step S4). When the mobile base station 10 arrives at the operation destination, the mobile base station 10 starts operation as a base station (step S5).

  If no movement is required in step S2, the process returns to step S1 and information related to the traffic volume of the plurality of mobile base stations 10 is acquired.

  As described above, according to the present embodiment, when a large number of mobile terminals that access the mobile base station 10 gather in a certain area, the management station 20 relates to the communication amount acquired from the mobile base station 10. Access concentration in the area can be recognized from the information. Therefore, another mobile base station 10 can be moved in real time to an area where access concentration occurs, and communication congestion in that area can be eliminated.

  Next, a second embodiment of the present invention will be described with reference to the drawings.

  In this embodiment, in a high-density C-RAN (Centralized Radio Access Network) architecture that provides a high-speed, large-capacity wireless network, in addition to a fixed installation type wireless base station, an autonomously movable flight equipped with a wireless device It is an example of embodiment using a moving body. According to the configuration described below, it is possible to construct a base station network variably and in real time according to the usage state of radio resources.

  FIG. 3 is a diagram illustrating a schematic configuration of a wireless communication system according to the second embodiment of this invention. As shown in FIG. 3, the wireless communication system 2 of the present embodiment includes a management station 101, a macrocell base station 102A that covers the macrocell C102A as a communicable area, and a macrocell base station 102B that covers the macrocell C102B as a communicable area. Is provided. The wireless communication system 2 includes small cell base stations 103A to 105A installed in the macro cell C102A and small cell base stations 103B to 105B installed in the macro cell C102B.

  The management station 101 is a base station apparatus that includes a baseband processing unit that performs digital signal processing of a macro cell base station and a small cell base station.

  The macrocell base stations 102A and 102B are base stations that are installed around the management station 101 and have a radio base station function unit. The macrocell base stations 102A and 102B and the management station 101 are connected by an optical fiber cable 106. The macrocell C102A and the macrocell C102B covered by the macrocell base stations 102A and 102B are areas having a radius of several hundred meters to several tens of kilometers.

  Similar to the macro cell base station, the small cell base stations 103A to 105A and 103B to 105B are base stations having a radio base station function unit, and cover a small communicable area compared to the macro cell base station. The small cell base stations 103A to 105A and 103B to 105B are installed in the macro cell C102A or an area where the terminal usage density is high in the macro cell C102B, and are used for the purpose of supplementing the radio resources of the macrocell base stations 102A and 102B. The small cell base stations 103 </ b> A to 105 </ b> A and 103 </ b> B to 105 </ b> B and the management station 101 are connected by an optical fiber cable 106 as in the macro cell base station. In addition, a small cell base station may be independently installed outside a macro cell.

  In addition, the wireless communication system 2 of the present embodiment includes a base base 110 that stores the flying mobile base station in the vicinity of the management station 101. The base base 110 mainly charges the battery unit 301 of the flying mobile base station.

  In addition, the wireless communication system 2 of the present embodiment includes a plurality of connection points 140 to 142 connected to the management station 101 and the optical fiber cable 106 in the macro cell C102A or the macro cell C102B. The management station 101 instructs one of the connection points 140 to 142 as the movement destination to the flying mobile base stations 120 to 131 stored in the base base 110.

  When the management station 101 transmits an outgoing command to move to the connection point 140 to the flying mobile base station 130, the flying mobile base station 130 connects to the connection point 140 instructed from the base base 110 as shown in FIG. Move up. After the flight mobile base station 130 arrives at the connection point 140 of the operation destination, it can communicate with the management station 101 by connecting to the connection point 140 of the movement destination, and the small cell base stations 103A to 105A, 103B to Operation equivalent to 105B is performed.

  Note that the flying mobile base stations 120 to 123 shown in FIG. 3 are connected to connection points (not shown), communicate with the management station 101, and perform operations corresponding to the small cell base stations 103A to 105A and 103B to 105B. .

  The management station 101 can also transmit a movement command to the flying mobile base station so as to move from the connection point in the macro cell C102A to the connection point in the macro cell C102B. When the management station 101 transmits a movement command to move to the connection point 142 to the flying mobile base station 131 operating in the macro cell C102A, as shown in FIG. 3, the flying mobile base station 131 moves in the macro cell C102A. The connection point 141 moves to the connection point 142 in the macro cell C102B.

Further, the management station 101 periodically receives information on the state of the macro cell base stations 102A and 102B, the small cell base stations 103A to 105A, and the flying mobile base stations 120 to 131, for example, information on the traffic, so that the macro cell base station 102A, 102B, small cell base stations 103A-105A, 103B-105B state monitoring, etc. Although two macro cells are connected to the management station 101, the number of connectable macro cell base stations is limited to two Absent. The number of installable small cell base stations 103 </ b> A to 105 </ b> A and 103 </ b> B to 105 </ b> B depends on the processing capability of the management station 101.

  FIG. 4 is a block diagram showing a configuration of the flying mobile base station of FIG. FIG. 4 shows the configuration of the flying mobile base station 120, but the other flying mobile base stations 121 to 130 have the same configuration. As shown in FIG. 4, the flying mobile base station 120 includes a battery unit 301 that is a power source of the flying mobile base station 120. Since the flying mobile base station 120 incorporates the battery unit 301, it is not necessary to supply power from the connection point of the operation destination. The battery unit 301 can be charged at the base base 110.

  Further, the flying mobile base station 120 may include a solar system unit 302 and be capable of supplying power by solar power generation. According to this configuration, the flying mobile base station 120 can be operated for a long time by the hybrid operation of the battery unit 301 and the solar system unit 302.

  The flying mobile base station 120 includes a power unit 304 and a flight function unit 305 that cause the flying mobile base station 120 to fly. The power unit 304 and the flight function unit 305 are realized by a general technique or a technique that will be developed in the future. In the present invention, there is no limitation on a technique for realizing a technique of accurately flying and moving to a destination.

  Further, the flying mobile base station 120 is equipped with, for example, a GPS (Global Positioning System), grasps the current position, stores the connection point that has received the command, and manages position information for moving to the connection point. A location information management unit 306 is provided.

  The flying mobile base station 120 also includes a radio base station function unit 307 having functions corresponding to the small cell base stations 103A to 105A and 103B to 105B. The radio base station function unit 307 includes a network interface unit 3071, a modulation / demodulation function unit 3072, an RF transmission / reception function unit 3073, and a connection unit 3074. The network interface unit 3071 has a function of converting an optical signal and an electrical signal. The network interface unit 3071 is connected to the management station 101 through, for example, an optical fiber cable via a connection unit 3074 connected to a connection point. The modulation / demodulation function unit 3072 includes a demodulation function that demodulates a baseband signal received from the management station 101 and converts it into an RF signal, and a modulation function that modulates the RF signal and converts it into a baseband signal that is transmitted to the management station 101. The RF transmission / reception function unit 3073 includes a transmission function for converting the RF signal generated by the modulation / demodulation function unit 3072 into a frequency to be transmitted as a radio wave, and a reception function for converting the received radio wave to a frequency processed by the modulation / demodulation function unit 3072. Note that the configuration of the radio base station function unit 307 is not limited to this, and any function equivalent to the small cell base stations 103A to 105A and 103B to 105B may be provided.

  The flying mobile base station 120 also includes an antenna 308 for receiving radio waves from the terminals and transmitting radio waves to the terminals. In addition, the flying mobile base station 120 includes a flying body control radio unit 310 that performs wireless communication with the management station 101 when not connected to the optical fiber cable 106.

  The flying mobile base station 120 includes a general control unit 303. The general control unit 303 is connected to and controls the radio base station function unit 307, the location information management unit 306, the power unit 304, and the flying object control radio unit 310.

  FIG. 5 is a block diagram showing the configuration of the management station of FIG. As described above, the management station 101 includes the baseband processing unit 1011 that performs digital signal processing of the macro cell base station, the small cell base station, and the flying mobile base station. In addition, the management station 101 includes a network interface unit 1012 that relays communication between the optical fiber cable 106 and the baseband processing unit 1011.

  The management station 101 also includes an information acquisition unit 1013 that acquires information that is used as a material for determining the movement of the flying mobile base station, and a storage unit 1014 that stores the acquired information. Information to be acquired includes, for example, date, time, fixed base station (macrocell base station, small cell base station) and flying mobile base station identification information and resource usage (communication amount), failure of a managed base station Examples include detection information, resource increase prediction information due to event holding, a standby state of the flying mobile base station, a charging state of the flying mobile base station in standby, and the like. Note that the management station 101 is not limited to this, and the management station 101 may acquire information necessary for the movement determination of the flying mobile base station and store the information in the storage unit 1014.

  Further, the management station 101 includes a movement necessity determination unit 1015 that determines whether or not the flying mobile base station needs to be moved from information stored in the storage unit 1014 and determines the movement destination when movement is necessary. . The movement necessity determination unit 1015 determines, for example, whether or not the flying mobile base station needs to move using the threshold value of the traffic stored in the storage unit 1014.

  The management station 101 includes a selection command unit 1016 that selects a flying mobile base station that moves and transmits a command to the flying mobile base station that moves. The selection command unit 1016 is a flying mobile base station (first mobile base station) that moves to a communication area of a flying mobile base station (first mobile base station) whose communication amount exceeds a threshold among a plurality of flying mobile base stations. 2nd mobile base station) is selected. Further, the selection command unit 1016 is a flying mobile base station that moves a flying mobile base station that is operating among the plurality of flying mobile base stations and whose communication volume is likely to decrease below a threshold value. Select as the station (second mobile base station). In addition, the selection command unit 1016 may be the base base 110 when there is no flying mobile base station that is operating among the plurality of flying mobile base stations and whose traffic volume is likely to decrease below a threshold value. Is selected as a mobile base station (second mobile base station) for moving a flying mobile base station that is not in operation.

  The management station 101 also includes an identification information setting unit 1017 that sets identification information in the flying mobile base station. When the identification information setting unit 1017 selects a flying mobile base station that is not in operation as a flying mobile base station to move (second mobile base station), the identification information setting unit 1017 is in operation stored in the storage unit 1014. The identification information that does not overlap with the identification information of the flying mobile base station in operation is set with reference to the identification information of the flying mobile base station. As the identification information, a cell ID (Identification) may be set, or information obtained by adding a CSI-RS (Channel State Information-Reference Signal) index to the cell ID may be set as the identification information.

Next, the operation of the second embodiment will be described with reference to the drawings. First, the outline of the operation of dispatching and returning the flying mobile base station will be described. FIG. 6 is a diagram illustrating an example of a change in traffic. Management station 101, a fixed base station (macro cell base station, the small cell base station) monitors the time variation of traffic in and flying mobile base station, e.g., a threshold amount communication is set in advance at time T ₁ If it exceeds, it is determined that the flying mobile base station needs to be moved. Note that the broken lines in FIG. 6 indicate the traffic thresholds for determining the dispatch of the flying mobile base station and the return of the operating base station. For example, the management station 101 may set a predetermined amount of communication amount, for example, 80% of communication amount as the threshold value, with respect to the number of terminals that can be processed by the fixed base station in the communication area of the fixed base station. The management station 101 sets a threshold value based on, for example, the operation of the operator 107 and stores it in the storage unit 1014.

Conversely, if the amount of communication is equal to or lower than the threshold at time T _2, the management station 101, The return to flying mobile base station that has call out is determined to have become unnecessary flying mobile base station to a base a base 110 Is commanded.

An outline of the operation of moving the flying mobile base station in operation to a different communication area will be described. FIG. 7 is a diagram illustrating an example of a change in communication amount and determination of movement in two communication areas. In the upper graph of FIG. 7, the solid line indicates the traffic in the macro cell C102A that is the communication area of the macrocell base station 102A, the broken line indicates the traffic in the macrocell C102B that is the communication area of the macrocell base station 102B, and the dotted line indicates the threshold. Indicates the value. Management station 101 monitors the communication amount of time variation in the two communication areas, traffic macrocells C102A at time T ₃ as shown in the upper portion of the graph of FIG. 7 exceeds the threshold, the base base 110 It is assumed that the dispatch command to the connection point in the macro cell C102A is transmitted to the flying mobile base station 131 that has been arranged.

Then, in a state where the flying mobile base station 131 is operating at the macrocell C102A, traffic macrocell C102B exceeds the threshold value at time _{T 4,} whereas, the threshold traffic macrocell C102A is in decline Judge that it is likely to be the following. Thus, the management station 101 sets the flying mobile base station 131 operating in the macro cell C102A as a flying mobile base station that moves to the macro cell C102B. The management station 101 transmits a movement command to move to the macro cell C102B to the flying mobile base station 131 operating in the macrocell C102A. The flying mobile base station 131 that has received the movement command moves from the macro cell C102A to the macrocell C102B.

  FIG. 8 is a flowchart showing the flying mobile base station control operation of the second embodiment.

  First, the management station 101 acquires information used as a determination material for determining the movement of the flying mobile base station for the subordinate fixed base station and flying mobile base station, and stores the information in the storage unit 1014 (step S11). . In addition, the management station 101 sets a communication amount threshold value for determining the movement of the flying mobile base station (step S12). Thereafter, the management station 101 acquires the traffic volume from the first base station of the subordinate fixed base station and the flying mobile base station (step S13), and determines whether the multiple traffic volumes exceed the threshold ( Step S14). Note that the order of the determination of the subordinate fixed base station and the flying mobile base station is determined in an arbitrary order so as not to be lost, and is determined in advance, for example, in ascending order of the identification number. In step S14, if the traffic is equal to or less than the threshold value and the flying mobile base station (YES in step S15), the management station 101 transmits a return command to the flying mobile base station (step S16). . If it is a fixed base station (NO in step S15), the management station 101 transmits a return command to the flying mobile base station operating in the communication area (step S17).

In the example of FIG. 6, at time T _2, because the traffic of the flying mobile base station is equal to or less than the threshold value, the management station 101 to the flying mobile base station transmits The return instruction.

On the other hand, when the traffic volume exceeds the threshold value in step S13, the management station 101 predicts the transition of the traffic volume in each area (step S18), and there is an area where the traffic volume is likely to decrease below the threshold value. It is determined whether or not to perform (step S19). In the example of FIG. 7, the management station 101 is greater than the amount of communication macrocell C102B threshold at time T _4, whereas, when the amount of communication transition of macrocell C102A is at a reduced likely area following traffic threshold recognize.

  If it is determined in step S19 that there is an area where the traffic volume is likely to decrease below the threshold, the management station 101 acquires information on the flying mobile base station 131 operating in that area (macro cell C102A) (step S19). S20). If there is no problem in the charging state of the flying mobile base station 131, the management station 101 selects the flying mobile base station 131 (step S21), and the communication amount to the selected flying mobile base station 131 in step S14. The movement command to the area (macro cell C102B) exceeding the threshold value is transmitted (step S22). If there are a plurality of areas where the traffic volume is likely to decrease below the threshold in step S19, the management station 101 acquires information on the flying mobile base station 131 operating in each of the plurality of areas in step S20. In step S21, the flying mobile base station with the best charge state may be selected.

  On the other hand, if it is determined in step S19 that there is no area where the traffic volume is likely to decrease below the threshold, the management station 101 stores information on the flying mobile base station stored in the base base 110, for example, the charging state. Is acquired (step S23). Also, the management station 101 selects, for example, the flying mobile base station with the best charging state based on the information acquired in step S21. Further, the management station 101 refers to the identification information of the active flying mobile base station stored in the storage unit 1014, and sets identification information that does not overlap with the identification information of the operating flying mobile base station. (Step S24). Then, the management station 101 transmits, to the selected flying mobile base station, a movement command to the area where the communication amount has exceeded the threshold in step S13 (step S25).

For example confirmed at time T ₃ in the example of FIG. 7 and traffic of the macro cell C102A exceeds the threshold value, if the amount of communication is determined that there is likely to decrease below the threshold area to other areas, the management station 101 acquires information of the flying mobile base station stored in the base base 110. In addition, the management station 101 transmits a movement command to the selected flying mobile base station 131 to the macro cell C102A whose communication amount has exceeded the threshold value in step S13.

  After steps S15, S16, S21, and S24, it is determined whether the determination of the communication amount in step S13 is completed for all areas (step S26). If not, the communication amount of the next area is acquired (step S26). S27), the process returns to step S14.

  The effects of the second embodiment described above will be described. The first effect is that a base station is provided in the flying object, and the flying object moves according to the change in the traffic volume of the area, so that the base station arrangement can be changed in real time, and the radio base station resource that occurs unexpectedly It is possible to avoid the shortage.

  The second effect is that the base station is installed in the flying mobile body, and it is difficult to cope with the method of installing the base station on the ground mobile body such as an automobile. It is a point that can cope with delay.

  The third effect is that the base station moves in accordance with the change in the traffic of the area, so that suppressing the installation of excessive fixed base stations can reduce the capital investment of the radio base station management operator. .

  The fourth effect is that the power consumption required for the operation of the fixed base station can be suppressed because the base station is provided with the battery unit and the solar system unit so that self-power supply is possible.

  Next, a third embodiment will be described. FIG. 9 is a block diagram showing the configuration of the flying mobile base station according to the third embodiment. FIG. 10 is a block diagram illustrating a configuration of the management station according to the third embodiment. In the second embodiment, the management station 101 includes the movement necessity determination unit 1015, the selection instruction unit 1016, and the identification information setting unit 1017. In this embodiment, the flying mobile base station 220 determines whether the movement is necessary. Unit 2204, selection instruction unit 2203, and identification information setting unit 2202, and the management station 201 of this embodiment includes an information acquisition providing unit 2013 instead of the information acquisition unit, and the flying mobile base station acquires information. The second embodiment is different from the second embodiment in that a portion 2201 is provided. In addition, a fixed base station (macro cell base station, small cell base station) (not shown) of this embodiment includes a movement necessity determination unit 2204, a selection command unit 2203, and an information acquisition unit 2201.

  FIG. 11 is a flowchart showing a schematic operation of the third embodiment. The management station 201 of the present embodiment, like step S11 of FIG. 8 in the second embodiment, provides information that is used as a material for determining whether or not the flying mobile base station needs to move, for example, a fixed base station (macrocell base station, small cell The communication amount of the cell base station) and the flying mobile base station is acquired and stored in the storage unit 1014 (step S31). In addition, the management station 201 sets a threshold value for the communication amount for determining the movement of the flying mobile base station (step S32), similarly to step S12 of FIG. 8 in the second embodiment.

  Thereafter, the fixed base station (macro cell base station, small cell base station) and the flying mobile base station determine whether or not the flying mobile base station needs to move based on the traffic volume of their own area, In that case, the destination is determined (step S33). At this time, the management station 201 determines whether or not the flying mobile base station needs to be moved in the fixed base station (macro cell base station, small cell base station) and the flying mobile base station. Information on the fixed base station (macro cell base station, small cell base station) and the flying mobile base station is provided (step S34).

  Further, the fixed base station (macro cell base station, small cell base station) and the flying mobile base station select the flying mobile base station to move (step S35). Also at this time, the management station 201 uses the fixed base station (macrocell base station, small cell base station) that selects the flying mobile base station to move and the other fixed base stored in the storage unit 1014 in the flying mobile base station. Information on the base station (macro cell base station, small cell base station) and the flying mobile base station is provided (step S36).

  Then, the fixed base station (macro cell base station, small cell base station) and the flying mobile base station transmit a command including the destination information determined in step S33 to the flying mobile base station determined in step S35 ( Step S37).

Thereafter, as in the first embodiment, the flying mobile base station 220 that has received the movement command moves in accordance with the movement command (step S4). Start operation as a station (step S5)
Next, details of steps S33 and S35 in the present embodiment will be described. FIG. 12 is a flowchart showing the flying mobile base station control operation of the second embodiment.

  First, the fixed base station (macro cell base station, small cell base station) and the flying mobile base station 220 acquire the communication amount of the own station (step S41) and determine whether the communication amount exceeds the threshold (step S42). ). In step S42, when the traffic is equal to or less than the threshold value, the fixed base station (macro cell base station, small cell base station) and the flying mobile base station 220 are the flying mobile base station (step S42). It moves to the base base without issuing a movement command to other flying mobile base stations (step S44). If the fixed base station (macrocell base station, small cell base station) and the flying mobile base station 220 are fixed base stations (NO in step S43), the flying mobile that is operating in the communication area of the local station A return instruction is transmitted to the base station (step S45).

  On the other hand, when the communication amount exceeds the threshold value in step S42, the fixed base station (macro cell base station, small cell base station) and the flying mobile base station 220 are connected to other fixed base stations (macro cell base station, small cell base station, small cell base station). Cell base station) and the amount of traffic of the flying mobile base station are requested from the management station 201 and acquired from the management station 201, and other fixed base stations (macro cell base station, small cell base station) and flying mobile base station Is predicted (step S46). It is determined whether there is an area where the traffic volume is likely to decrease below the threshold (step S47), and when it is determined that there is an area where the traffic volume is likely to decrease below the threshold, the fixed base station (macro cell base station, The small cell base station) and the flying mobile base station 220 request the management station 201 for information on the flying mobile base station operating in the area, for example, the charging state, and acquire the information from the management station 201 (step S48). The fixed base station (macro cell base station, small cell base station) and the flying mobile base station 220 select the flying mobile base station based on the information of the flying mobile base station, for example, the state of charge (step S49), and select it. A command to move to the communication area of the own station is transmitted to the flying mobile base station that has performed (step S50). It is checked whether another movement command has arrived at the flying mobile base station selected at this time. If another movement command has arrived, the process returns to step S49, and another flying mobile base station is selected.

  If there are a plurality of areas where the traffic volume is likely to decrease below the threshold value in step S47, the fixed base station (macro cell base station, small cell base station) and the flying mobile base station 220 each of the plurality of areas in step S48. Information on the flying mobile base station operating in the area, such as information on the charging state, may be acquired, and the flying mobile base station with the best charging state may be selected in step S49.

  On the other hand, if it is determined in step S47 that there is no area where the traffic volume is likely to decrease below the threshold, the fixed base station (macro cell base station, small cell base station) and the flying mobile base station 220 Information on the flying mobile base station stored in 110, for example, information on the state of charge, is requested to the management station 201 and acquired from the management station 201 (step S51). Then, the fixed base station (macro cell base station, small cell base station) and the flying mobile base station 220 select, for example, the flying mobile base station with the best charge state based on the information acquired in step S51 (step S52). The fixed base station (macro cell base station, small cell base station) and the flying mobile base station 220 refer to the identification information of the flying mobile base station in operation stored in the storage unit 1014 and are in operation. The identification information which does not overlap with the identification information of the flying mobile base station is set. The fixed base station (macro cell base station, small cell base station) and the flying mobile base station 220 transmit to the selected flying mobile base station a command to move to its own communication area (step S53). At this time, the fixed base station (macro cell base station, small cell base station) and the flying mobile base station 220 confirm whether another movement command has arrived at the selected flying mobile base station. If another movement command has arrived, the fixed base station (macro cell base station, small cell base station) and the flying mobile base station 220 return to step S52 and select another flying mobile base station.

  The effect similar to 2nd Embodiment is acquired also by 3rd Embodiment described above. In other words, since the flying object is equipped with a base station, and the flying object moves according to the change in the traffic volume of the area, the base station arrangement can be changed in real time, and the sudden shortage of radio base station resources that occurs suddenly can be avoided. Is possible. In addition, since the flying mobile unit is equipped with a base station, it is difficult to cope with the method of installing a base station on a ground mobile unit such as an automobile. can do. In addition, since the base station moves according to the change in the communication amount of the area, it is possible to suppress the installation of an excessive number of fixed base stations, and to reduce the capital investment amount of the radio base station management operator. Furthermore, since the base station includes a battery unit and a solar system unit, self-power supply is possible, so that it is possible to suppress power consumption required for the operation of the fixed base station.

  The present invention has been described above with reference to the embodiments, but the present invention is not limited to the above embodiments. Various changes that can be understood by those skilled in the art can be made to the configuration and details of the present invention within the scope of the present invention.

  For example, it has been described that the flying mobile body includes the wireless base station function unit, but the flying mobile body also includes the baseband processing unit provided in the management station in addition to this, the baseband processing unit + the wireless base station It is good also as a flying mobile base station which integrated the station function part. The baseband processing unit mainly performs call control protocol control, the function of transmitting / receiving IP packets to / from a host device through a transmission line, the function of converting a baseband signal transferred from the transmission line interface unit, the wireless unit and the baseband signal Has a functional part to send and receive. Since the configuration in the baseband processing unit is widely known and is not an item related to the request of the present invention, detailed description thereof is omitted.

  In this modification, the flying mobile base station and the host device for connecting to the core network are connected to a transmission line interface unit (not shown) provided in the baseband processing unit via Ethernet (registered trademark). It will be.

  In the second embodiment, the management station that centrally manages the flying mobile base station and the flying mobile base station are connected by the optical fiber cable 106. However, as a further development, the management station and the flying mobile base station are connected. It is good also as a structure by which radio | wireless communication is performed between the high-order apparatuses for connecting between stations or a flying mobile base station and a core network. That is, a part of the network interface unit and the fiber optic cable connection part in the radio unit control unit and the radio base station function unit provided for control of the management station and the flight mobile base station are set as a common radio connection unit. It is good as composition.

  In this modification, the landing and operation location of the flying mobile base station is not required, so in addition to the effects described so far, the flying mobile base station can be used even in locations where the operation location is not set. As a result, the capital investment cost can be further reduced.

  Moreover, you may comprise so that a part or all of each step shown to the flowchart of FIG.2, FIG.8, FIG.11 and FIG. 12 may be implement | achieved by operation of the operator to a management station. Alternatively, an artificial intelligence chip or an artificial intelligence chip mounting module is mounted on at least one of the flying mobile base station and the management station, and some or all of the steps shown in the flowcharts of FIG. 2, FIG. 8, FIG. 11, and FIG. May be configured to be performed by an artificial intelligence chip or an artificial intelligence chip mounting module.

  According to the configuration performed by the artificial intelligence chip or the artificial intelligence chip mounting module, the operator of the flying mobile body and the management operator are not required, so that the operation maintenance cost can be reduced.

DESCRIPTION OF SYMBOLS 1, 2 Wireless communication system 10 Mobile base station 20, 101, 201 Management station 21, 1013, 2201 Information acquisition part 22, 1015, 2204 Movement necessity judgment part 102A, 102B Macrocell base station 103A-105A, 103B-105B Small Cell base station 106 Optical fiber cable 107 Operator 120-131, 220 Flying mobile base station 140-142 Connection point 1011 Baseband processing unit 1012 Network interface unit 1014 Storage unit 1016, 2203 Selection command unit 1017, 2202 Identification information setting unit 2013 Information Acquisition providing unit 301 Battery unit 302 Solar system unit 303 General control unit 304 Power unit 305 Flight function unit 306 Location information management unit 307 Radio base station function unit 308 Antenna 310 flying object control radio unit 3071 network interface unit 3072 modulation / demodulation function unit 3073 RF transmission / reception function unit 3074 connection unit

Claims (10)

A plurality of mobile base stations mounted on the mobile;
A management station that obtains information on the traffic volume of the plurality of mobile base stations and determines whether or not the mobile base station needs to be moved based on the traffic volume;
A wireless communication system. The management station, an information acquisition unit for acquiring information related to the traffic of the plurality of mobile base stations,
A movement necessity determination unit that determines necessity of movement of the plurality of mobile base stations based on the communication amount;
The wireless communication system according to claim 1, comprising:   The wireless communication system according to claim 2, wherein the movement necessity determination unit uses a threshold value of the communication amount.   And a selection command unit for selecting a second mobile base station to be moved to the communication area of the first mobile base station whose communication amount has exceeded the threshold among the plurality of mobile base stations. Item 4. The wireless communication system according to Item 3.   The selection command unit selects a mobile base station that is an active mobile base station among the plurality of mobile base stations and whose communication traffic is likely to decrease below the threshold value as the second mobile base station. The wireless communication system according to claim 4, wherein the wireless communication system is selected as a station.   The selection command unit is in operation when there is no mobile base station that is operating among the plurality of mobile base stations and the communication amount is likely to decrease below the threshold. The radio communication system according to claim 4 or 5, wherein no mobile base station is selected as the second mobile base station.   7. An identification information setting unit that sets identification information that does not overlap with identification information of the active mobile base station when the inactive mobile base station is selected as the second mobile base station. The wireless communication system according to 1. An information acquisition unit for acquiring information on the traffic volume of a plurality of mobile base stations mounted on the mobile;
A movement necessity determination unit that determines necessity of movement of the plurality of mobile base stations based on the communication amount;
Management station with. An information acquisition unit for acquiring information on the traffic volume of a plurality of mobile base stations mounted on the mobile;
A movement necessity determination unit that determines necessity of movement of the plurality of mobile base stations based on the communication amount;
A mobile base station. Obtain information about the traffic volume of multiple mobile base stations mounted on a mobile unit,
Determining the necessity of movement of the plurality of mobile base stations based on the traffic;
Mobile base station control method.

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