JP6766423B2 - Mobile communication system - Google Patents

Description

The present invention relates to a mobile communication system, and more particularly to a mobile communication system including an air vehicle having a built-in base station function, which is controlled by using a SON (Self Organizing Network) server.

LTE (Long Term Evolution) is widely used as a technology for mobile communication systems. In LTE, a terminal housed 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 the network connected to the base station.

In addition, a SON (Self Organizing Network) system has been developed in recent years, which enables the setting of a base station, which has been performed by an operator, autonomously. In the SON system, the SON server collects and analyzes setting parameters and information indicating the communication status from the base stations connected to the SON server and the terminals under them, and the base station settings are dynamically set based on the analysis results. Is changed to.

In connection with the present invention, Patent Document 1 describes an air vehicle equipped with a wireless router.

Japanese Unexamined Patent Publication No. 2014-091335

In the event of an emergency such as a disaster, the availability of contact with the user carrying the terminal may determine the viability of the user. However, if a base station installed on the ground becomes unable to communicate, there is a risk that communication with the terminals under the base station will not be restored for a long period of time. In such a case, it is possible to restore communication with the terminal 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 a car and depends on the state of the road network. Therefore, it may not be possible to install the base station in a place required from the viewpoint of the mobile communication system. In addition, if the transportation network is disrupted due to a disaster, it may not even be possible to move the in-vehicle wireless base station near the coverage (cover area) of the base station on the ground that has become unusable. ..

Furthermore, since the in-vehicle wireless base station is basically designed on the assumption that the communication service is executed without moving at the place where it is placed, it moves in real time so that it can communicate with the terminal with better quality. Therefore, it is difficult to optimize the arrangement of base stations. Further, the technique described in Patent Document 1 does not replace the base station used in the mobile communication system.

(Purpose of Invention)
An object of the present invention is to provide a mobile communication system capable of quickly recovering a suitable communication service in an area where a communication service is stopped due to a problem of a base station on the ground.

The mobile communication system of the present invention includes a ground base station installed on the ground that can communicate with a terminal, an air vehicle that can move over the sky and has the functions of a base station that can communicate with the terminal, and a ground base station and flight. It is provided with a server device that is communicably connected to the body and sets communication parameters that define the operation of the flying body.

The control method of the mobile communication system of the present invention enables communication between a ground base station installed on the ground capable of communicating with a terminal and an air vehicle capable of moving over the sky having the function of a base station capable of communicating with the terminal. It is characterized in that it is connected and the communication parameters that specify the operation of the air vehicle are set in the air vehicle.

The server device of the present invention includes a ground base station installed on the ground capable of communicating with a terminal, an air vehicle capable of moving in the sky having the function of a base station capable of communicating with the terminal, and an interface for communicating. It is provided with a calculation unit for obtaining communication parameters that define the operation of the aircraft.

INDUSTRIAL APPLICABILITY The present invention can realize a quick and suitable recovery of a communication service in an area where the communication service is stopped due to a problem of a radio base station on the ground.

It is a figure which shows the configuration example of the SON system 100 of 1st Embodiment. It is a block diagram which shows the configuration example of SON server 8. It is a block diagram which shows the structural example of the base station 1. It is an example of the top view of the drone type base station 12. It is an example of the side view of the drone type base station 12. It is an example of the functional block diagram about the base station of the drone type base station 12. It is a flowchart which shows the example of the operation procedure of SON system 100. It is a figure which shows the example of the state immediately after the drone type base stations 12 and 13 of a 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. It is a flowchart which shows an example of the method of determining the number of deployments of a drone type base station. It is a figure which shows the configuration example of the SON system 200 of the 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 signal directions or movement directions, and do not limit those directions.

(First Embodiment)
FIG. 1 is a diagram showing a configuration example of a SON (Self Organizing Network) system 100 according to a first embodiment of the present invention. The SON system 100 includes base stations 1 to 5, communication satellites 6, networks 7, SON servers 8, and drone-type base stations 12 and 13. Base stations 1 to 5 and drone-type base stations 12 and 13 have a function of a radio base station used in LTE (Long Term Evolution). The numbers of base stations 1 to 5 and drone-type base stations 12 and 13 are examples, and are not limited thereto. Hereinafter, base stations 1 to 5 and drone type base stations 12 and 13 are collectively referred to as "each base station". Further, 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. The broken line indicates the 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, each of the base stations 1 to 5 can accommodate a plurality of terminals. The communication satellite 6 includes a wireless communication interface with the drone type base stations 12, 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 also connects the terminal under each 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 in each base station. Further, the SON server 8 also has a function of transmitting an instruction to move to a designated position, an instruction to control the directivity direction of the antenna, and the like to the drone type base stations 12 and 13. The positions of the drone-type base stations 12 and 13 are defined by, for example, latitude, longitude, and altitude.

Communication parameters include parameters such as transmission power and handover threshold that are collected from the base station in a general SON system and set for the base station. Further, in the present embodiment, the communication parameters include whether or not the drone type base station is used, its position, and the directivity direction of the antenna included 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 showing a configuration example of the SON server 8. The SON server 8 includes an acquisition unit 801 and 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 the communication service of the SON system 100, and the communication parameter can be recalculated by the algorithm. For example, the calculation unit 802 may calculate the communication parameters of each base station so that the total coverage area of each base station is maximized. Alternatively, the calculation unit 802 may calculate the communication parameters of each base station so that the area of coverage overlapping at each base station is small. The calculation unit 802 handles the drone type base stations 12 and 13 as communication parameters including information on whether or not they are used, their positions, and the directivity direction of the antenna. The interface 803 is a communication interface circuit with the outside. 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. Interface 803 may further include an interface for direct communication with the communication satellite 6.

FIG. 3 is a block diagram showing 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. Base stations 2 to 5 also have the same configuration and functions as 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. The radio unit 103 converts the baseband signal received from the control unit 102 into a radio signal and radiates it from the antenna 104, and also converts the radio signal received by the antenna 104 into a baseband signal and outputs it to the control unit 102.

The control unit 102 processes signals transmitted to and received 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 is 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 has a function for directly connecting to the network 7, and data transmitted between the terminal and its communication destination may be directly transmitted to and received 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 functions as the drone-type base station 12. The drone-type base station 12 is an air vehicle having the function of a base station. The drone-type base station 12 includes a housing 202 and four propellers 201. The drone-type base station 12 can be flown by the external control by wireless communication or the driving of the propeller by the autonomous control of the drone-type base station 12, and the drone-type base station 12 can be moved to a predetermined place 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. The number of antennas 203 may be plural, and not all antennas need to face downward. The antenna 203 is, for example, an array antenna, and its directivity can be changed by electrical control. The housing 202 incorporates an electric circuit for realizing the function of the base station. A block diagram of the base station is shown in FIG.

FIG. 6 is an example of a functional block diagram of the drone type base station 12 regarding the base station. 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 that a general flying object has, 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 changes and demolishes the signal transmitted to and from the control unit 212 to realize data transmission to and from 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 changes and demolishes the signal transmitted to and from the control unit 212, and realizes data transmission to the subordinate terminal. 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 of processing signals 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 a substitute for a base station installed on the ground. The SON server 8 determines which base station installed on the ground is used as a substitute for the drone-type base station 12 included in the SON system 100. The communication parameters required to replace the function of the terrestrial 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 notified to the control unit 212. It will be remembered. Therefore, the control unit 212 may include a non-volatile memory. The antenna 203 directly connected to the radio unit 213 radiates the radio signal generated by the radio unit 213 and outputs the radio signal received from the terminal to the radio unit 213. The terminal is connected to the communication destination of the terminal via the radio unit 213, the control unit 212, the satellite radio unit 211, the communication satellite 6, and the network 7. The above description of 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 the operation procedure of the SON system 100 of the first embodiment will be described with reference to FIGS. 1, 7 to 10. Hereinafter, a case where two drone-type base stations 12 and 13 are used as alternatives when the base station 3 becomes unusable due to a disaster or the like will be described. However, the following operation can be applied even when a base station other than the base station 3 becomes unusable.

FIG. 7 is a flowchart showing an example of the operation procedure of the SON system 100 of the first embodiment. 8 and 9 are diagrams showing how two drone-type base stations 12 and 13 are used to substitute the functions of the base station 3.

FIG. 1 shows the configuration of the SON system 100 when all the base stations 1 to 5 on the ground are operating normally. However, when the base station 3 becomes unable to communicate due to a disaster or the like, the communication data from the base station 3 is not transmitted to the SON server 8. If the acquisition unit 801 of the SON server 8 does not receive communication data from the base station 3 for a predetermined period of time, 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 a procedure for determining the number of drone-type base stations deployed will be described later with reference to FIG.

When it is determined in step S01 that the drone type base stations 12 and 13 need to be deployed, 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 positions of the base stations 3 that cannot communicate (for example, latitude, longitude and altitude), and the performance and quantity of the drone-type base stations to be deployed. The information indicating the positions of the drone type base stations 12 and 13 may include the directivity direction of the antenna.

The initial positions of the drone-type base stations 12 and 13 to be deployed are arbitrary, for example, above the base station 3. The altitudes of the drone-type base stations 12 and 13 are set to the altitude at which the terminals on the ground and the drone-type base stations 12 and 13 can communicate with each other. When the positions of the drone-type base stations 12 and 13 at the time of deployment 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. Upon receiving the instruction, the drone-type base stations 12 and 13 start flying and rest at the position specified by the communication parameter notified from the SON server 8. Then, the drone type base stations 12 and 13 start operating as a substitute for the base station 3. The drone-type base stations 12 and 13 can autonomously hold or move their positions based on the instructions from the SON server 8.

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

When the drone-type base stations 12 and 13 are deployed, the SON system 100 restarts the communication service provided by the base station 3 using them. After resuming 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). When the SON server 8 determines that the communication quality of the entire SON system 100 is improved by changing the settings of the drone type base stations 12 and 13 (step S05: Yes), the communication parameters of the drone type base stations 12 and 13 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 it is estimated that the communication quality is further improved, and update the position information of the drone type base stations 12 and 13. Further, in step S06, the communication parameters of the ground base stations 1, 2, 4, and 5 other than the drone type base stations 12 and 13 may be changed together. Alternatively, the communication parameters of the drone type base stations 12 and 13 may not 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 procedure of steps S04 to S06 periodically or irregularly. If it is determined that the change of the communication parameter is unnecessary (step S05: No), the communication parameter is not updated.

FIG. 9 is a diagram showing 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 of 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 was slightly insufficient in the vicinity of the base station 4. However, in FIG. 9, the positions of the drone-type base stations 12 and 13 are changed, and the coverage that is insufficient only with the base stations 1, 2, 4, and 5 is sufficiently covered by the drone-type base stations 12 and 13. When the communication parameters of the drone-type base stations 12 and 13 shown in FIG. 9 are changed (in this case, the position is changed), the radio waves from the drone-type base station 12 or 13 from the base station 4 are relatively or absolutely weak. It may be triggered by detecting that. For example, when 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 that of the base stations 1, 2 and 5, the SON server 8 indicates the direction of the base station 4. It can be estimated that there is a lack of coverage in. Therefore, 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 in the direction of the base station 4.

The parameters included in the communication parameters include, but are not limited to, for example, the transmission power, the handover threshold, the directivity of the antenna, and the position of the drone type base station. The communication parameters can include parameters that can be set in the base station in a general SON system base station. And each of these parameters can have an independent threshold. The calculation unit 802 of the SON server 8 analyzes the communication states (for example, communication quality such as received power, error rate, and signal-to-noise ratio) of the drone-type base stations 12 and 13 obtained from the communication parameters. Then, as a result of the analysis, when the communication state has reached the threshold value of any of the parameters, 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 the threshold value, the SON server 8 may 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 type base station 12 and control the directivity of the antenna 203 of the drone type base station 12 so as to improve the communication quality. In this case, the threshold value of the communication state that starts the control of altitude and the threshold value of the communication state that starts the control of the directivity of the antenna may be different.

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. The calculation unit 802 of the SON server 8 first identifies the base station on the ground where communication has become impossible, and collects information about its coverage (step S11 in FIG. 10). In the present 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 drone-type base station that can be operated, and the number of drone-type base stations required to replace 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 calculated required number of drone-type base stations cannot be operated (step S13: No), the settings of each base station are changed so as to ensure coverage (step S15), and the calculation is performed. A large number of drone-type base stations are deployed (step S14). Ensuring coverage in step S15 can be realized, for example, by making settings such as allowing a decrease in communication quality when a drone type base station is used for each base station using communication parameters.

After obtaining the coverage information of the base station 3 (after step S11), the coverage of each base station may be redefined based on the distribution of the population in the SON system 100. For example, the coverage of less densely populated areas may be reduced and the resulting resources may be allocated to ensure coverage of more densely populated areas. Further, in step S12, even if a spare drone-type base station is secured by reducing the number of operable drone-type base stations in consideration of the possibility that other base stations on the ground will be unable to communicate in the future. Good. When calculating the location of drone-type base stations, the number of drone-type base stations deployed may be changed. Further, when the area with high traffic moves as the terminal moves, the drone type base station may be moved according to the movement of the terminal. As a result, it is possible to continue the communication service for the terminal moving out of the coverage of the base station on the ground. These changes may be implemented with the intervention of an operator or may be preliminarily incorporated into the operating procedure of the calculation unit 802.

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

The first reason is that by using a drone type base station, it is possible to quickly deploy a wireless base station to a required place without depending on the state of the transportation network. The second reason is that the SON server can quickly calculate the position to deploy the drone type base station by 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 the optimum location according to the distribution and movement of the terminals.

(Other representations 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 the elements in the first embodiment are shown in parentheses. That is, the mobile communication system includes ground base stations (base stations 1 to 5), flying objects (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 aircraft has the function of a base station capable of communicating with the terminal. The server device is communicably connected to the ground base station and the air vehicle, and sets the air vehicle with communication parameters that specify the operation of the ground base station or the air vehicle. By providing an air vehicle having a base station function, a mobile communication system having such a configuration can realize a quick and suitable recovery of a communication service in an area where a communication service is stopped due to a problem of a ground base station.

Further, the above-mentioned server device 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 an air vehicle that can move over the sky and has the function of a base station that can communicate with the terminal. The calculation unit obtains communication parameters that specify the operation of the flying object. A server device having such a configuration can control an air vehicle by obtaining communication parameters of the air vehicle and notifying the air vehicle of the communication parameters via an interface. As a result, the server device can use the flying object to quickly and appropriately restore the communication service to the area where the communication service is stopped due to the problem of the ground base station.

(Second Embodiment)
FIG. 11 is a diagram showing a configuration example of the SON system 200 according to the second embodiment of the present invention. FIG. 11 shows a case where the coverage of the base station 3 that cannot communicate is wide, while the alternative drone type base station 12 is only one. The alternate long and short dash line in FIG. 11 shows the coverage of the base station 3. In FIG. 11, the description of the line and the terminal indicating the connection 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 drone-type base station 12 that can be deployed. Here, even if the communication parameters are changed, the coverage of the base station 3 may not be replaced by the drone type base station 12 alone. In such a case, the calculation unit 802 keeps updating the parameters related to the position among the communication parameters of the drone type base station 12 in a short cycle. In this embodiment, the position parameters are repeatedly updated in a short period of time such that the drone-type base station 12 orbits clockwise within the coverage of the base station 3 as indicated by the dashed arrow in FIG. Will be done. As a result, since the coverage of the drone type base station 12 covers the coverage of the base station 3, there is no area where communication is not possible at all times in the coverage of the base station 3.

Further, the SON server 8 uses the drone-type base station 12 to reduce the moving speed at a position where there is a lot of traffic, so that the time spent in the sky above 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 secure coverage with a smaller number of drone-type base stations in addition to the effect 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 not possible at all times.

(Modified example of embodiment)
A modification 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 being via the communication satellite 6. However, the SON server 8 grasps the base stations 1, 2, 4, and 5 that can communicate with each other, and performs 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. The interface for communication between base stations in this case 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 are on the ground. Can be connected to the network 7 via the base station and the SON server 8.

Although the present invention has been described above 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 within the scope of the present invention in terms of the structure and details of the present invention. For example, the above 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 exclusive to each other. The actions and effects of the present invention may be realized by a configuration in which all or a part of the above-described embodiments are combined.

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

In addition, the embodiment of the present invention may be described as the following appendix, but is not limited thereto.

(Appendix 1)
A ground base station installed on the ground that can communicate with the terminal,
An air vehicle that can move over the sky and has the function of a base station that can communicate with the terminal.
A server device that is communicably connected to the ground base station and the flying object and sets communication parameters that define the operation of the flying object in the flying object.
A mobile communication system equipped with.

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

(Appendix 3)
The communication parameter includes at least one of the position of the air vehicle, the transmission power of the base station included in the air vehicle, the handover threshold of the base station included in the air vehicle, and the directivity of the antenna included in the air vehicle. , The mobile communication system according to Appendix 1 or 2.

(Appendix 4)
The mobile communication system according to any one of Supplementary note 1 to 3, wherein the server device sets the communication parameters of the aircraft so as to replace the coverage of the base station that has become incommunicable among the base stations.

(Appendix 5)
The mobile communication according to Appendix 4, wherein the server device uses the plurality of the flying objects to set the communication parameters of the plurality of flying objects so as to replace the coverage of the base station that has become incommunicable. system.

(Appendix 6)
The server device is described in Appendix 4 or 5, wherein the server device controls the communication parameters of the air vehicle to orbit the air vehicle so as to cover the coverage of the base station in which the air vehicle is 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 orbit when the traffic using the flying object is large.

(Appendix 8)
A ground base station installed on the ground that can communicate with a terminal and an air vehicle that can move in the sky having the function of a base station that can communicate with the terminal are communicably connected to the flight body. A control method for mobile communication systems that sets communication parameters that define body movements.

(Appendix 9)
Further described in Appendix 8, the communication parameters are acquired from the air vehicle, the communication parameters are recalculated based on the acquired communication parameters, and the recalculated communication parameters are set in the air vehicle. Control method of mobile communication system.

(Appendix 10)
An interface for communicating with a ground base station installed on the ground capable of communicating with a terminal and an air vehicle that can move over the sky having the function of a base station capable of communicating with the terminal.
A calculation unit that obtains communication parameters that define the operation of the aircraft, and
A server device that comprises.

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

(Appendix 12)
Communicates with a ground base station installed on the ground that can communicate with the terminal,
Communicates with a mobile aircraft that has the function of a base station that can communicate with the terminal,
Find the communication parameters that define the operation of the aircraft.
How to control the server device.

(Appendix 13)
further,
Obtaining the communication parameters from the flying object,
The method for controlling a server device according to Appendix 12, wherein the communication parameters are recalculated based on the acquired communication parameters.

(Appendix 14)
Procedure for communicating with a ground base station installed on the ground that can communicate with a terminal,
A procedure for communicating with a movable aircraft over the sky having the function of a base station capable of communicating with the terminal,
Procedure for obtaining communication parameters that specify the operation of the flying object,
A program that causes the computer of the server device to execute.

(Appendix 15)
further,
Procedure for acquiring the communication parameter from the flying object,
A procedure for recalculating the communication parameter based on the acquired communication parameter,
14 is described in Appendix 14, which causes the computer of the server device to execute the program.

1 to 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 Housing 203 Antenna 211 Satellite radio unit 212 Control Part 213 Radio part 801 Acquisition part 802 Calculation part 803 Antenna

Claims (6)

A ground base station installed on the ground that can communicate with the terminal,
An air vehicle that can move over the sky and has the function of a base station that can communicate 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.
Equipped with a,
The communication parameter is a parameter used in communication between the flying object and the server device.
The server device is
The communication parameters of the aircraft are set to replace the coverage of the base station that has become incommunicable among the base stations.
The flying object is orbited by updating the position of the flying object included in the communication parameters so that the flying object covers the coverage of the base station in which communication is disabled .
A mobile communication system that reduces the speed of the orbit when the traffic using the flying object is large . The server device collects the communication parameters from the air vehicle, recalculates the communication parameters based on the collected communication parameters, and sets the recalculated communication parameters in the air vehicle. Item 1. The mobile communication system according to item 1. The server device according to claim 1 or 2, wherein the server device uses the plurality of the air vehicles to set the communication parameters of the plurality of air vehicles so as to replace the coverage of the base station that has become incommunicable. Mobile communication system. A ground base station installed on the ground capable of communicating with a terminal and an air vehicle that can move in the sky having the function of a base station capable of communicating with the terminal are connected in a communicable manner.
The server device sets the flying object with communication parameters used in communication between the flying object and the server device, which define the operation of the flying object.
The communication parameters of the aircraft are set to replace the coverage of the base station that has become incommunicable among the base stations.
The flying object is orbited by updating the position of the flying object included in the communication parameters so that the flying object covers the coverage of the base station in which communication is disabled.
When the traffic using the flying object is large, the speed of the orbit is reduced.
How to control a mobile communication system . Further, claim 4, the communication parameter is acquired from the air vehicle, the communication parameter is recalculated based on the acquired communication parameter, and the recalculated communication parameter is set in the air vehicle. The described method of controlling a mobile communication system . An interface for communicating with a ground base station installed on the ground capable of communicating with a terminal and an air vehicle that can move over the sky having the function of a base station capable of communicating with the terminal.
A calculation unit that obtains communication parameters that define the operation of the aircraft, and
It is a server device equipped with
The communication parameter is a parameter used in communication between the flying object and the server device.
The calculation unit
The communication parameters of the aircraft are set to replace the coverage of the base station that has become incommunicable among the base stations.
The flying object is orbited by updating the position of the flying object included in the communication parameters so that the flying object covers the coverage of the base station in which communication is disabled.
A server device that reduces the speed of the orbit when the traffic using the flying object is large .

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