JP2017195493A - Mobile communication system - Google Patents

Abstract

PROBLEM TO BE SOLVED: To allow a suitable communication service to be restored quickly for an area where the communication service is stopped due to a problem with a ground radio base station.SOLUTION: A mobile communication system of the present invention includes: a ground base station capable of communicating with a terminal and installed on the ground; a flying object having a function of a base station capable of communicating with the terminal and capable of moving up in the sky; and a server device communicatively connected with the ground base station and the flying object and for setting a communication parameter regulating operation of the flying object to the flying object.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a mobile communication system, and more particularly, to a mobile communication system including a flying object that is controlled using a SON (Self Organizing Network) server and has a built-in base station function.

  LTE (Long Term Evolution) is widely used as a mobile communication technology. In LTE, a terminal accommodated in a base station can communicate with a terminal and a computer connected to the same LTE network or another network via the base station and a network connected to the base station.

  In recent years, a SON (Self Organizing Network) system has been developed that enables autonomous setting of a base station that has been performed by an operator's work. In the SON system, the SON server collects and analyzes information indicating the setting parameters and communication status from the base stations connected to the SON server and the terminals under them, and the base station settings are dynamically determined based on the analysis result. Changed to

  In relation to the present invention, Patent Document 1 describes a flying object equipped with a wireless router.

JP 2014-091335 A

  When an emergency such as a disaster occurs, the possibility of contact with the user carrying the terminal may determine the survivability of the user. However, when a base station installed on the ground is incapable of communication, there is a possibility that communication with a terminal under the base station may not be restored for a long time. In such a case, communication with the terminal can be recovered by deploying a base station that can move on the ground, such as an in-vehicle wireless base station, as an alternative. However, the place where the in-vehicle wireless base station can be placed is a place that can be reached by car, and depends on the state of the road network. For this reason, a base station may not be installed in a place required from the viewpoint of a mobile communication system. In addition, when the transportation network is severed due to a disaster, it may not even be possible to move the in-vehicle wireless base station to the vicinity of the coverage (cover area) of the ground base station that has become unavailable. .

  In addition, the in-vehicle wireless base station is designed on the premise that the communication service is executed without moving in the place where it is basically located, so it moves in real time so that it can communicate with the terminal with better quality. Thus, it is difficult to optimize the arrangement of base stations. Further, the technique described in Patent Document 1 is not a substitute for a base station used in a mobile communication system.

(Object of invention)
An object of the present invention is to provide a mobile communication system capable of quickly and suitably recovering a communication service for an area where the communication service is stopped due to a problem with a ground base station.

  The mobile communication system of the present invention includes a ground base station installed on the ground that can communicate with a terminal, a flying body that has the function of a base station that can communicate with the terminal, a ground that can move above, a ground base station, and a flight. And a server device that is communicably connected to the body and sets communication parameters that define the operation of the flying object in the flying object.

  The control method of the mobile communication system of the present invention enables communication between a ground base station installed on the ground that can communicate with a terminal, and a flying object that can move over the sky and has a base station function that can communicate with the terminal. It connects, and the communication parameter which prescribes | regulates operation | movement of a flying body is set to a flying body, It is characterized by the above-mentioned.

  The server device of the present invention is a ground base station installed on the ground that can communicate with a terminal, a flying object having a function of a base station that can communicate with the terminal, an interface for performing communication, And a calculation unit for obtaining communication parameters for defining the operation of the flying object.

  INDUSTRIAL APPLICABILITY The present invention can realize a quick and suitable restoration of a communication service for an area where the communication service has been stopped due to a problem with a ground radio base station.

It is a figure which shows the structural example of the SON system 100 of 1st Embodiment. 3 is a block diagram illustrating a configuration example of a SON server 8. FIG. 2 is a block diagram illustrating a configuration example of a base station 1. FIG. It is an example of the top view of drone type base station 12. It is an example of the side view of drone type base station 12. It is an example of the functional block diagram regarding the base station of the drone type base station 12. 3 is a flowchart illustrating an example of an operation procedure of the SON system 100. It is a figure which shows the example of a state immediately after the drone type base stations 12 and 13 of the SON system 100 are deployed. It is a figure which shows the example in which the communication parameter of the drone type base stations 12 and 13 was changed in the SON system 100. FIG. It is a flowchart which shows the example of the judgment method of the number of deployment of a drone-type base station. It is a figure which shows the structural example of the SON system 200 of 2nd Embodiment.

  Embodiments of the present invention will be described below with reference to the drawings. The arrows in the drawings showing the configuration of each embodiment show examples of the direction of the signal or the direction of movement, and the direction is not limited.

(First embodiment)
FIG. 1 is a diagram illustrating a configuration example of a SON (Self Organizing Network) system 100 according to the first embodiment of this invention. The SON system 100 includes base stations 1 to 5, a communication satellite 6, a network 7, a SON server 8, and drone type base stations 12 and 13. The base stations 1 to 5 and the drone type base stations 12 and 13 have a function of a radio base station used in LTE (Long Term Evolution). The numbers of the base stations 1 to 5 and the drone type base stations 12 and 13 are examples, and are not limited thereto. Hereinafter, the base stations 1 to 5 and the drone-type base stations 12 and 13 are collectively referred to as “each base station”. In FIG. 1 and subsequent drawings of the SON system, a circle centered on each base station indicates the coverage (cover area) of each base station. A broken line indicates a connection between the SON server 8 and the base stations 1 to 5.

  Base stations 1 to 5 are radio base stations used in LTE. Base stations 1 to 5 accommodate terminals. Although only one terminal 9 is illustrated in FIG. 1, the base stations 1 to 5 can each accommodate a plurality of terminals. The communication satellite 6 includes a wireless communication interface with the drone-type base stations 12 and 13 and the network 7. The communication satellite 6 enables communication between the drone type base stations 12 and 13 and the SON server 8 via the network 7. The network 7 connects the communication satellite 6 and the SON server 8 and connects the terminals under the base station and the communication destination of the terminal. The SON server 8 includes a computer having a function of collecting and analyzing communication parameters of each base station and setting communication parameters for each base station. Furthermore, the SON server 8 also has a function of transmitting to the drone type base stations 12 and 13 an instruction to move to a designated position, an instruction to control the antenna directivity direction, and the like. The positions of the drone-type base stations 12 and 13 are defined by, for example, latitude, longitude, and altitude.

  Communication parameters include parameters that are collected from a base station in a general SON system and set for the base station, such as transmission power and a handover threshold. Furthermore, in the present embodiment, the communication parameters include the presence / absence and use of the drone-type base station, and the direction of the antenna provided in the drone-type base station. The SON server 8 resets the communication parameters for each base station based on the analysis result of the communication parameters.

  FIG. 2 is a block diagram illustrating a configuration example of the SON server 8. The SON server 8 includes an acquisition unit 801, a calculation unit 802, and an interface 803. The acquisition unit 801 acquires each communication parameter from each base station via the interface 803. The calculation unit 802 recalculates the communication parameters of each base station based on the acquired communication parameters. The calculation unit 802 includes an algorithm for optimizing the quality of communication service of the SON system 100, and can recalculate communication parameters using the algorithm. For example, the calculation unit 802 may calculate the communication parameters of each base station so that the total area of coverage of each base station is maximized. Or the calculation part 802 may calculate the communication parameter of each base station so that the area of the coverage which overlaps in each base station may become small. The calculation unit 802 handles the communication parameters including the presence / absence of use of the drone-type base stations 12 and 13, their position, and the antenna directivity direction information. The interface 803 is an external communication interface circuit. The interface 803 includes a communication interface with the base stations 1 to 5, a communication interface with the drone-type base stations 12 and 13, and a communication interface with the network 7. The interface 803 may further include an interface for directly communicating with the communication satellite 6.

  FIG. 3 is a block diagram illustrating a configuration example of the base station 1. The base station 1 includes an interface 101, a control unit 102, a radio unit 103, and an antenna 104. The base stations 2 to 5 also have the same configuration and function as the base station 1.

  The antenna 104 transmits and receives radio waves for communicating with terminals under the base station 1. The antenna 104 is connected to the radio unit 103. Radio section 103 converts the baseband signal received from control section 102 into a radio signal and radiates it from antenna 104, and converts the radio signal received by antenna 104 into a baseband signal and outputs it to control section 102.

  The control unit 102 processes a signal transmitted / received to / from the terminal and causes the entire base station 1 to function as a base station. The interface 101 is a wireless or wired interface circuit between the base station 1 and the SON server 8. The base station 1 is connected to the SON server 8 and also connected to the network 7 via the SON server 8.

  The terminals under the base station 1 communicate with the communication destination via the base station 1, the SON server 8, and the network 7. However, the interface 101 of the base station 1 may have a function for directly connecting to the network 7, and data transmitted between the terminal and its communication destination may be directly transmitted / received to / from the network 7.

  FIG. 4 is an example of a top view of the drone type base station 12. The drone-type base station 13 also has the same configuration and function as the drone-type base station 12. The drone type base station 12 is a flying object having a base station function. The drone type base station 12 includes a casing 202 and four propellers 201. The drone-type base station 12 can be caused to fly by driving from the outside by wireless communication or by the propeller driven by the autonomous control of the drone-type base station 12, and the drone-type base station 12 can be moved to a predetermined location in the sky. The SON server 8 can control the drone type base station 12 via the network 7 and the communication satellite 6.

  FIG. 5 is an example of a side view of the drone-type base station 12. The drone type base station 12 includes an antenna 203. There may be a plurality of antennas 203, and all antennas do not have to face downward. The antenna 203 is an array antenna, for example, and the directivity can be changed by electrical control. The casing 202 contains an electric circuit for realizing the function of the base station. A block diagram for the base station is shown in FIG.

  FIG. 6 is an example of a functional block diagram relating to the base station of the drone type base station 12. The drone-type base station 12 includes an antenna 203, a satellite radio unit 211, a control unit 212, and a radio unit 213. A part of the antenna 203 is connected to the satellite radio unit 211, and the other antenna 203 is connected to the radio unit 213. The drone-type base station 12 further includes functions of a general flying object such as an attitude control function, a position information acquisition function, and a power supply control function. However, in FIG. 6, the description of the functional blocks of these general flying objects is omitted.

  The satellite radio unit 211 modulates and demodulates signals transmitted to and from the control unit 212 to realize data transmission with the communication satellite 6. The antenna 203 directly connected to the satellite radio unit 211 transmits the radio signal generated by the satellite radio unit 211 to the communication satellite 6 and outputs the radio signal received from the communication satellite 6 to the satellite radio unit 211.

  The radio unit 213 modulates and demodulates a signal transmitted to and from the control unit 212, thereby realizing data transmission with a terminal under control. The antenna 203 directly connected to the radio unit 213 transmits the radio signal generated by the radio unit 213 to the terminal and outputs the radio signal received from the terminal to the radio unit 213. The control unit 212 includes a function for processing a signal transmitted and received between the terminal and the communication satellite 6 and a control function for realizing the entire function of the drone type base station 12.

  The drone-type base station 12 operates as an alternative to a base station installed on the ground. The SON server 8 determines which of the base stations installed on the ground to operate the drone-type base station 12 included in the SON system 100 as an alternative. Communication parameters required to replace the function of the ground base station with the drone type base station 12 are notified from the SON server 8 to the drone type base station 12 via the network 7 and the communication satellite 6, and are sent to the control unit 212. Remembered. For this reason, the control unit 212 may include a nonvolatile memory. The antenna 203 directly connected to the radio unit 213 emits a radio signal generated by the radio unit 213 and outputs a radio signal received from the terminal to the radio unit 213. The terminal is connected to the communication destination of the terminal via the wireless unit 213, the control unit 212, the satellite wireless unit 211, the communication satellite 6, and the network 7. The description regarding the drone type base station 12 is the same for the drone type base station 13.

(Operation procedure of the first embodiment)
An example of an operation procedure of the SON system 100 according to the first embodiment will be described with reference to FIGS. 1 and 7 to 10. Hereinafter, a case will be described in which two drone type base stations 12 and 13 are used as an alternative when the base station 3 becomes unusable due to a disaster or the like. However, the following operation can also be applied when a base station other than the base station 3 becomes unusable.

  FIG. 7 is a flowchart illustrating an example of an operation procedure of the SON system 100 according to the first embodiment. FIG. 8 and FIG. 9 are diagrams showing how the function of the base station 3 is replaced by using two drone-type base stations 12 and 13.

  FIG. 1 shows the configuration of the SON system 100 when all the ground base stations 1 to 5 are operating normally. However, when the base station 3 becomes unable to communicate due to a disaster or the like, communication data from the base station 3 is not transmitted to the SON server 8. When the acquisition unit 801 of the SON server 8 does not receive communication data from the base station 3 for a predetermined period, the SON server 8 can determine that the base station 3 cannot communicate. In this case, the calculation unit 802 determines whether or not the drone type base stations 12 and 13 need to be deployed (step S01 in FIG. 7). An example of the procedure for determining the number of deployed drone-type base stations will be described later with reference to FIG.

  If it is determined in step S01 that the deployment of the drone type base stations 12 and 13 is necessary, the calculation unit 802 calculates the positions (for example, latitude, longitude, altitude) of the drone type base stations 12 and 13 (step S02). . The positions of the drone-type base stations 12 and 13 can be calculated based on, for example, the position (for example, latitude, longitude, and altitude) of the base station 3 that has become unable to communicate, and the performance and quantity of the deployed drone-type base stations. The information indicating the positions of the drone type base stations 12 and 13 may include the antenna directivity direction.

  The initial positions of the deployed drone type base stations 12 and 13 are arbitrary, for example, above the base station 3. The altitude of the drone type base stations 12 and 13 is set to an altitude at which the ground terminal and the drone type base stations 12 and 13 can communicate with each other. When the positions at the time of deployment of the drone type base stations 12 and 13 are calculated, the drone type base stations 12 and 13 are deployed (step S03).

  The SON server 8 transmits communication parameters via the interface 803, the network 7 and the communication satellite 6 based on the calculation result of the calculation unit 802, and instructs the drone type base stations 12 and 13 to fly. The drone-type base stations 12 and 13 that have received the instruction start flying and stop at the position specified by the communication parameter notified from the SON server 8. Then, the drone type base stations 12 and 13 start operation as an alternative to the base station 3. The drone-type base stations 12 and 13 can autonomously hold or move their positions based on an instruction from the SON server 8.

  FIG. 8 is a diagram illustrating an example of a state immediately after the drone base stations 12 and 13 are deployed in the SON system 100. Since the coverage of each of the drone-type base stations 12 and 13 is narrower than the coverage of the base station 3, the coverage of the base station 3 is substantially replaced by the two drone-type base stations 12 and 13 in FIG. The broken line in FIG. 8 indicates the connection between the SON server 8 and the base stations 1 to 4. An alternate long and short dash line indicates a connection between the communication satellite 6 and the drone-type base stations 12 and 13. In FIG. 8 and FIG. 9, the description of the terminal is omitted.

  When the drone type base stations 12 and 13 are deployed, the SON system 100 resumes the communication service provided by the base station 3 using these. After restarting the communication service, the SON server 8 acquires and analyzes the communication parameters of the drone-type base stations 12 and 13 via the communication satellite 6 (step S04 in FIG. 7), and determines the necessity of changing the communication parameters. (Step S05). If the SON server 8 determines that the communication quality of the entire SON system 100 is improved by changing the settings of the drone base stations 12 and 13 (step S05: Yes), the communication parameters of the drone base stations 12 and 13 are determined. Is updated (step S06). At this time, the SON server 8 may move the drone type base stations 12 and 13 to a place where the communication quality is estimated to be further improved, and update the position information of the drone type base stations 12 and 13. In step S06, the communication parameters of the ground base stations 1, 2, 4, 5 other than the drone base stations 12 and 13 may be changed together. Alternatively, the communication parameters of the drone type base stations 12 and 13 may be changed, and at least one communication parameter of the base stations 1, 2, 4, and 5 may be changed. The SON server 8 repeats the procedures of steps S04 to S06 regularly or irregularly. If it is determined that the communication parameter does not need to be changed (step S05: No), the communication parameter is not updated.

  FIG. 9 is a diagram illustrating an example in which the communication parameters of the drone type base stations 12 and 13 are changed by the procedure of steps S05 to S06 in FIG. 7 in the SON system 100. In FIG. 9, the positions of the drone type base stations 12 and 13 are changed by changing the communication parameters. In FIG. 8, the coverage of the drone type base stations 12 and 13 in the vicinity of the base station 4 is slightly insufficient. However, in FIG. 9, the positions of the drone-type base stations 12 and 13 are changed, and the drone-type base stations 12 and 13 sufficiently cover the coverage that is insufficient with only the base stations 1, 2, 4, and 5. The drone type base stations 12 and 13 shown in FIG. 9 change the communication parameters (in this case, the position change). The drone type base station 12 or 13 is relatively or absolutely weak in radio waves from the base station 4. It may be triggered by detecting this. For example, if the communication parameters of the drone-type base stations 12 and 13 indicate that the radio wave from the base station 4 is weaker than the base stations 1, 2, and 5, the SON server 8 It can be estimated that there is a lack of coverage. Accordingly, the SON server 8 can determine that the communication quality of the entire SON system 100 is improved by moving at least one of the drone-type base stations 12 and 13 toward the base station 4.

  The parameters included in the communication parameters include, but are not limited to, for example, transmission power, handover threshold, antenna directivity direction, and drone type base station position. The communication parameters can include parameters that can be set in the base station in a general SON system base station. These parameters can have independent threshold values. The calculation unit 802 of the SON server 8 analyzes the communication state (for example, communication quality such as reception power, error rate, and signal-to-noise ratio) of the drone-type base stations 12 and 13 obtained from the communication parameters. As a result of the analysis, when the communication state has reached the threshold value of any parameter, the calculation unit 802 may recalculate the communication parameter in order to optimize the parameter that has reached the threshold value. For example, when the error rate of the drone-type base station 12 exceeds a threshold value, the SON server 8 may perform control to lower the altitude of the drone-type base station 12. Alternatively, the SON server 8 may change the directivity of the antenna 203 of the drone base station 12 and control the directivity of the antenna 203 of the drone base station 12 so that the communication quality is improved. In this case, the communication state threshold value for starting the advanced control may be different from the communication state threshold value for starting the antenna directivity control.

  FIG. 10 is a flowchart showing an example of a method for determining the number of deployed drone-type base stations in step S01 of FIG. First, the calculation unit 802 of the SON server 8 identifies a ground base station that has become unable to communicate, and collects information about its coverage (step S11 in FIG. 10). In this embodiment, it is determined that the base station 3 has become unable to communicate. The coverage information of each base station may be stored in advance in the SON server 8 or another device connected to the SON server 8. Subsequently, the coverage of the base station 3 is compared with the coverage of the operable drone type base station, and the number of drone type base stations necessary for substituting the coverage of the base station 3 is calculated (step S12). When the calculated number of drone-type base stations can be operated (step S13: Yes), the calculated number of drone-type base stations is deployed (step S14). If the required number of drone-type base stations calculated cannot be operated (step S13: No), the calculation is performed after changing the setting of each base station so as to ensure the coverage (step S15). A number of drone-type base stations are deployed (step S14). The securing of the coverage in step S15 can be realized by, for example, setting each base station using a communication parameter so as to allow a decrease in communication quality when a drone-type base station is used.

  Note that after the coverage information of the base station 3 is obtained (after step S11), the coverage of each base station may be redefined based on the population distribution in the SON system 100. For example, the coverage of an area with a low population density may be reduced, and the generated resource margin may be used to ensure the coverage of an area with a high population density. In addition, in step S12, considering the possibility that other base stations on the ground may become unable to communicate in the future, the number of operable drone base stations can be reduced to secure a spare drone base station. Good. When calculating the position of the drone base station, the number of deployed drone base stations may be changed. Furthermore, when an area with high traffic moves as the terminal moves, the drone-type base station may be moved in accordance with the movement of the terminal. Thereby, the communication service with respect to the terminal which moves out of the coverage of the ground base station can be continued. These changes may be implemented by intervention of an operator, or may be incorporated in advance in the operation procedure of the calculation unit 802.

(Explanation of effect)
The SON system 100 according to the first embodiment can realize a quick and suitable restoration of a communication service for an area where the communication service is stopped due to a problem with a ground radio base station.

  The first reason is that by using a drone-type base station, it is possible to quickly deploy a radio base station to a necessary place without depending on the state of the traffic network. The second reason is that the position where the drone type base station is deployed can be quickly calculated by the SON server grasping the position of the ground base station. The third reason is that since the drone-type base station is used as an alternative base station, the drone-type base station can be moved to an optimal location according to the distribution and movement of the terminals.

(Other expressions of the configuration of the first embodiment)
The SON system 100 of the first embodiment shown in FIG. 1 can also be described as the following mobile communication system. The names of elements in the first embodiment are shown in parentheses. That is, the mobile communication system includes a ground base station (base stations 1 to 5), a flying body (drone type base stations 12 and 13), and a server device (SON server 8). A ground base station is a base station installed on the ground that can communicate with a terminal. The flying object has a function of a base station capable of communicating with a terminal. The server device is communicably connected to the ground base station and the flying object, and sets communication parameters that define the operation of the ground base station or the flying object in the flying object. A mobile communication system having such a configuration can realize a quick and suitable restoration of a communication service for an area where the communication service has been stopped due to a problem with a ground base station, by providing a flying body having a base station function.

  The server device described above may include an interface and a calculation unit. The interface communicates with each of a ground base station installed on the ground that can communicate with the terminal and a flying object that has a function of a base station that can communicate with the terminal and can move over the sky. A calculation part calculates | requires the communication parameter which prescribes | regulates operation | movement of a flying body. The server device having such a configuration can control the flying object by obtaining the communication parameter of the flying object and notifying the flying object of the communication parameter via the interface. As a result, the server device can realize a quick and suitable restoration of the communication service for the area where the communication service is stopped due to the problem of the ground base station using the flying object.

(Second Embodiment)
FIG. 11 is a diagram illustrating a configuration example of the SON system 200 according to the second embodiment of this invention. FIG. 11 shows a case where the coverage of the base station 3 that has become unable to communicate is wide, while there is only one alternative drone-type base station 12. A one-dot chain line in FIG. 11 indicates the coverage of the base station 3. In FIG. 11, description of lines and terminals indicating connections between each base station and the SON server 8 or the communication satellite 6 is omitted.

  In the SON system 200, the calculation unit 802 of the SON server 8 compares the coverage of the base station 3 that has become unable to communicate with the coverage of the deployable drone base station 12. Here, there is a case where the coverage of the base station 3 cannot be replaced only by the drone type base station 12 even by changing the communication parameter. In such a case, the calculation unit 802 continues to update the position-related parameters among the communication parameters of the drone-type base station 12 in a short cycle. In the present embodiment, the position-related parameters are repeatedly updated in a short time so that the drone-type base station 12 circulates clockwise within the coverage of the base station 3 as indicated by the dashed arrows in FIG. Is done. As a result, since the coverage of the drone type base station 12 covers the coverage of the base station 3, an area where communication is impossible at all times does not occur in the coverage of the base station 3.

  Further, the SON server 8 reduces the moving speed at a location where there is a lot of traffic using the drone-type base station 12, so that the stay time in the area where there is a lot of traffic is lengthened. The position may be controlled.

  The SON system 200 having such a configuration can ensure coverage with fewer drone-type base stations in addition to the effects of the SON system 100 of the first embodiment. The reason is that by moving the drone type base station, it is possible to prevent the occurrence of an area where communication is impossible at all times.

(Modification of the embodiment)
Modifications applicable to the above-described embodiment will be described. In the first and second embodiments, the communication between the drone-type base station 12 and the SON server 8 has been described as passing through the communication satellite 6. However, the SON server 8 grasps the base stations 1, 2, 4, and 5 that can communicate with each other so as to perform inter-base station communication between any of these base stations and the drone-type base stations 12 and 13. A base station may be set. In this case, the interface for communication between base stations is arbitrary. Since the drone-type base stations 12 and 13 can communicate with any of the ground base stations 1, 2, 4, and 5, even if the communication satellite 6 cannot be used, the terminals under the drone-type base stations 12 and 13 Can be connected to the network 7 via the base station and the SON server 8.

  Although the present invention has been described with reference to the embodiments, 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, the above-described embodiment can be applied not only to LTE but also to other mobile communication systems. Other mobile communication systems include, for example, W-CDMA (Wideband-Code Division Multiple Access).

  Further, the configurations described in the respective embodiments are not necessarily mutually exclusive. The operation and effect of the present invention may be realized by a configuration in which all or part of the above-described embodiments are combined.

  The functions and procedures of the SON server 8 described in the above embodiments may be realized by a central processing unit (CPU) included in the SON server 8 executing a program. The program is recorded on a fixed, non-temporary recording medium. As the recording medium, a semiconductor memory or a fixed magnetic disk device is used, but is not limited thereto. The CPU and the recording medium are provided in the calculation unit 802, for example. The function of the drone type base station 12 may also be realized by the CPU provided in the drone type base station 12 executing a program. In the drone type base station 12, the CPU and the recording medium are provided in the control unit 212, for example.

  In addition, although embodiment of this invention can be described also as the following additional remarks, it is not limited to these.

(Appendix 1)
A ground base station installed on the ground that can communicate with the terminal;
A flying object having a function of a base station capable of communicating with the terminal;
A server device that is communicably connected to the ground base station and the aircraft, and that sets communication parameters defining the operation of the aircraft in the aircraft;
A mobile communication system comprising:

(Appendix 2)
The server device collects the communication parameters from the aircraft, recalculates the communication parameters based on the collected communication parameters, and sets the recalculated communication parameters in the aircraft. 1. A mobile communication system according to 1.

(Appendix 3)
The communication parameter includes at least one of a position of the flying object, a transmission power of a base station included in the flying object, a handover threshold of a base station included in the flying object, and a directivity of an antenna included in the flying object. The mobile communication system described in Appendix 1 or 2.

(Appendix 4)
The mobile communication system according to any one of appendices 1 to 3, wherein the server device sets the communication parameter of the flying body so as to substitute for a coverage of a base station that cannot communicate with the base station.

(Appendix 5)
The mobile communication according to appendix 4, wherein the server device sets the communication parameters of the plurality of aircraft so as to replace the coverage of the base station that has become unable to communicate using the plurality of aircraft. system.

(Appendix 6)
The server apparatus is described in appendix 4 or 5, wherein the communication device controls the communication parameter of the flying object so as to cover the coverage of the base station in which the communication object has become unable to communicate. Mobile communication system.

(Appendix 7)
The mobile communication system according to appendix 6, wherein the server device reduces the speed of the lap when traffic using the flying object is large.

(Appendix 8)
A ground base station installed on the ground communicable with a terminal and a flying object having a function of a base station capable of communicating with the terminal are communicably connected, and the flight is connected to the flying object. A control method for a mobile communication system, which sets communication parameters for defining body operation.

(Appendix 9)
Further, the communication parameter is acquired from the flying object, the communication parameter is recalculated based on the acquired communication parameter, and the recalculated communication parameter is set in the flying object. Control method for a mobile communication system.

(Appendix 10)
A ground base station installed on the ground capable of communicating with the terminal, a flying object having a function of a base station capable of communicating with the terminal, an interface for performing communication, and
A calculation unit for obtaining communication parameters defining the operation of the flying object;
A server device comprising:

(Appendix 11)
The server apparatus according to attachment 10, further comprising an acquisition unit that acquires the communication parameter from the flying object, wherein the calculation unit recalculates the communication parameter based on the acquired communication parameter.

(Appendix 12)
Communicate with a ground base station installed on the ground that can communicate with the terminal,
Communicating with a flying object capable of moving over the sky with a base station function capable of communicating with the terminal,
Obtaining communication parameters defining the operation of the aircraft;
A method for controlling a server device.

(Appendix 13)
further,
Obtaining the communication parameters from the aircraft,
The server device control method according to appendix 12, wherein the communication parameter is recalculated based on the acquired communication parameter.

(Appendix 14)
Procedures to communicate with ground base stations installed on the ground that can communicate with the terminal,
A procedure for communicating with a flying object capable of moving over the sky with the function of a base station capable of communicating with the terminal;
A procedure for obtaining communication parameters defining the operation of the aircraft;
For causing the computer of the server device to execute.

(Appendix 15)
further,
A procedure for obtaining the communication parameters from the aircraft;
Recalculating the communication parameters based on the acquired communication parameters;
Is executed by the computer of the server device.

1-5 base station 6 communication satellite 7 network 8 SON server 9 terminal 12, 13 drone type base station 100, 200 SON system 101 interface 102 control unit 103 radio unit 104 antenna 201 propeller 202 case 203 antenna 211 211 satellite radio unit 212 control Unit 213 wireless unit 801 acquisition unit 802 calculation unit 803 interface

Claims (10)

A ground base station installed on the ground that can communicate with the terminal;
A flying object having a function of a base station capable of communicating with the terminal;
A server device that is communicably connected to the flying object, and sets communication parameters that define the operation of the flying object in the flying object;
A mobile communication system comprising:   The server device collects the communication parameters from the flying object, recalculates the communication parameters based on the collected communication parameters, and sets the recalculated communication parameters in the flying object. Item 4. The mobile communication system according to Item 1.   The communication parameter includes at least one of a position of the flying object, a transmission power of a base station included in the flying object, a handover threshold of a base station included in the flying object, and a directivity of an antenna included in the flying object. The mobile communication system according to claim 1 or 2.   The mobile communication system according to any one of claims 1 to 3, wherein the server device sets the communication parameter of the flying body so as to substitute for coverage of a base station that is out of communication among the base stations. .   5. The movement according to claim 4, wherein the server device sets the communication parameters of the plurality of aircrafts so as to replace the coverage of the base station that has become unable to communicate using the plurality of aircrafts. 6. Communications system.   6. The server device according to claim 4, wherein the server device circulates the flying object by controlling the communication parameters of the flying object so as to cover the coverage of the base station in which the flying object is disabled. Mobile communication system.   The mobile communication system according to claim 6, wherein the server device reduces the speed of the lap when traffic using the flying object is large.   A ground base station installed on the ground communicable with a terminal and a flying object having a function of a base station capable of communicating with the terminal are communicably connected, and the flight is connected to the flying object. A control method for a mobile communication system, which sets communication parameters for defining body operation.   The communication parameter is further acquired from the aircraft, the communication parameter is recalculated based on the acquired communication parameter, and the recalculated communication parameter is set in the aircraft. A control method of the described mobile communication system. A ground base station installed on the ground capable of communicating with the terminal, a flying object having a function of a base station capable of communicating with the terminal, an interface for performing communication, and
A calculation unit for obtaining communication parameters defining the operation of the flying object;
A server device comprising:

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