JP6549635B2 - Wireless communication apparatus, communication control method, and computer program - Google Patents

Description

  The present invention relates to a wireless communication apparatus, a communication control method, and a computer program.

  Conventionally, a handover technique is known in which a mobile terminal switches a radio base station connected by radio (see, for example, Patent Document 1).

JP, 2014-192738, A

In this prior art, based on the position information of the mobile terminal and the information on the reception quality of the mobile terminal, information on the radio base station to which the mobile terminal is to be handed over is acquired.
However, in the above-mentioned prior art, the mobile terminal existing in the sky can not acquire information on an appropriate wireless base station to be handed over, and the communication of the mobile terminal existing in the sky becomes unstable. There was a possibility. This is because the sky is clearer than the ground. Since the sky is clearer than the ground in the sky, radio signals from more radio base stations in the sky reach from the ground even at the same horizontal position (latitude and longitude). Therefore, an appropriate radio base to which the mobile terminal existing in the sky is to be handed over may be handed over when the radio base station of the reception quality of the same level, which is a candidate of handover destination, increases in the sky. It is not possible to obtain information on the station, and there is a possibility that the communication of the mobile terminal present in the sky becomes unstable.

  The present invention has been made in consideration of such circumstances, and an object thereof is to improve the stability of communication of a wireless communication device existing in the sky.

(1) In one aspect of the present invention, in a wireless communication apparatus mounted on a flying object, a wireless unit that receives a wireless signal transmitted from a wireless base station, and a wireless unit that the wireless unit wirelessly connects to If there is a cell not present in the adjacent cell list among the cells of the wireless base station identified by the wireless signal received by the wireless unit, the adjacent cell list storage unit that stores the adjacent cell list; And a communication control unit configured to change a communication partner selection method for selecting the wireless base station of the communication partner from among the plurality of wireless base stations of communication partner candidates.
(2) One aspect of the present invention is the wireless communication apparatus according to the above (1), wherein the communication control unit changes the communication party selection method to a predetermined sky communication party selection method.
(3) One aspect of the present invention is the wireless communication device according to (2) above, further including an aircraft movement direction determination unit that determines whether the movement direction of the aircraft is vertical or horizontal. When the communication control unit uses the airborne communication partner selecting method, the communication partner selecting method is used when the moving direction of the aircraft is horizontal according to the judgment result of the aircraft movement direction judging unit. The wireless communication device changes the method for selecting an air communication partner to the predetermined method for selecting an air horizontal movement communication partner.
(4) In one aspect of the present invention, in the wireless communication apparatus according to any one of (1) to (3), the communication partner selection method controls handover between the plurality of wireless base stations of communication partner candidates. Changing a handover parameter for the wireless communication apparatus.
(5) One aspect of the present invention is the wireless communication device according to the above (4), wherein the communication control unit acquires the handover parameter candidate from the wireless base station accessed from the flight location of the aircraft. It is a communication device.
(6) One aspect of the present invention is the wireless communication apparatus according to any one of the above (1) to (3), wherein the communication partner selecting method is to prohibit handover for a certain period of time.
(7) In one aspect of the present invention, in the wireless communication apparatus according to the above (6), the communication control unit transmits, from the wireless base station accessed from the flight location of the aircraft, information indicating the handover prohibited time. It is a wireless communication device to acquire.
(8) In one aspect of the present invention, in the wireless communication device according to any one of the above (1) to (3), the communication partner selecting method simultaneously performs communication from among the plurality of wireless base stations of communication partner candidates. It is a radio | wireless communication apparatus which is changing the number of objects of the said radio | wireless base station to perform.
(9) In one aspect of the present invention, in the wireless communication device according to any one of the above (1) to (8), authentication information of the flying object is acquired from an authentication information storage unit provided in the flying object. And an authentication request unit that transmits an authentication request to the authentication server that authenticates the airframe to request authentication of the airframe, and the communication control unit determines that the authentication result of the airframe of the authentication request unit is an authentication request. The wireless communication device is configured to change the communication partner selection method when the test result is passed, and not to change the communication partner selection method when the request result is a failure in authentication.

(10) One aspect of the present invention is a communication control method of a wireless communication device mounted on a flying object, wherein the wireless communication device receives a wireless signal transmitted from a wireless base station; An adjacent cell list storing step of storing the adjacent cell list received from the wireless base station to which the wireless communication apparatus wirelessly connects in an adjacent cell list storage unit; and the wireless communication apparatus receiving the wireless communication step by the wireless reception step When there is a cell not present in the adjacent cell list among the cells of the radio base station identified by the signal, the radio base station of the communication partner is selected from among the plurality of radio base stations of the communication partner candidate And a communication control step of changing the communication partner selection method.

(11) One aspect of the present invention is a wireless communication device mounted on a flying object, comprising: a wireless unit for receiving a wireless signal transmitted from a wireless base station; An adjacent cell list storing function of storing an adjacent cell list received from the wireless base station to be wirelessly connected, and in the cell of the wireless base station identified by the wireless signal received by the wireless unit, the adjacent cell list A computer for realizing a communication control function of changing a communication partner selection method of selecting the wireless base station of a communication partner from among the plurality of wireless base stations of communication partner candidates when there is a non-existing cell It is a program.

  According to the present invention, it is possible to improve the stability of communication of a wireless communication device existing in the sky.

It is a block diagram showing an example of functional composition of flight body 1 concerning one embodiment. It is an external view which shows an example of an external appearance structure of the aircraft 1 which concerns on one Embodiment. It is a block diagram showing an example of the hardware constitutions of radio communication equipment 100 concerning one embodiment. FIG. 2 is a block diagram showing an example of a functional configuration of the wireless communication device 100 according to an embodiment. It is a figure which shows the structural example of the hand-over parameter candidate data 141 which concerns on one Embodiment. It is a figure which shows the structural example of the parameter change area information 142 which concerns on one Embodiment. It is a figure which shows the structural example of the adjacent cell list | wrist 143 which concerns on one Embodiment. It is a flowchart of example 1 of the communication control method concerning one embodiment. It is a flowchart of example 2 of the communication control method concerning one embodiment. It is a flowchart of example 3 of the communication control method concerning one embodiment.

Hereinafter, embodiments of the present invention will be described with reference to the drawings.
FIG. 1 is a block diagram showing an example of a functional configuration of the aircraft 1 according to the present embodiment. FIG. 2 is an external view showing an example of the external appearance of the aircraft 1 according to the present embodiment. First, the mechanical configuration of the aircraft 1 will be described with reference to FIG. In FIG. 2, the flying object 1 includes a motor 60 and a rotor RT. The motor 60 applies lift and propulsive force to the aircraft 1 by rotating the rotor RT. In this example, the aircraft 1 includes the motors 61-64. Motors 61-64 rotate corresponding rotors RT1-RT4. By controlling the drive current supplied to each motor 60, it is possible to control the flight altitude, azimuth, and heading of the flying object 1.

  The aircraft 1 comprises a camera 40. The imaging unit, that is, the camera 40 images the scenery around the aircraft 1. In this example, the imaging direction of the camera 40 and the heading HDG of the aircraft 1 coincide with each other. In this case, the camera 40 captures a landscape in front of the aircraft 1. The camera 40 outputs an image of the captured landscape.

  Next, the functional configuration of the aircraft 1 will be described with reference to FIG. In FIG. 1, a flying object 1 includes a flight control unit 10, a flight positioning unit 30, a camera 40, a motor 60, a power supply unit 80, and a wireless communication device 100. The flight control unit 10 includes an authentication information storage unit 12.

  The flight positioning unit 30 measures the position of the aircraft 1 and outputs a positioning value of the measurement result. The positioning value indicates a horizontal position (latitude and longitude) and a vertical position (altitude). The flight positioning unit 30 includes an altimeter as means for measuring the vertical position. For example, a GPS (Global Positioning System) may be used as means for measuring the horizontal position of the flight positioning unit 30.

  The wireless communication device 100 communicates with a wireless base station present outside the aircraft 1. The wireless communication device 100 communicates with a device (for example, a remote control device of the airframe 1) outside the airframe 1 via the radio base station. The wireless base station with which the wireless communication apparatus 100 communicates may be, for example, a wireless base station of a mobile phone network of a communication scheme such as LTE (Long Term Evolution), or a wireless of a communication scheme such as IEEE 802.11. It may be a wireless base station (Access Point: AP) of a LAN (Local Area Network).

  The flight control unit 10 controls the flight of the aircraft 1 by controlling the drive current supplied to the motor 60. The flight route of the flying object 1 may be set in the flight control unit 10 before the flight, or may be set or changed in the flight control unit 10 by communication of the wireless communication device 100 during the flight. The flight control unit 10 controls the motor 60 so that the aircraft 1 flies along the flight route while comparing the flight route with the positioning value output from the flight positioning unit 30.

  The flight control unit 10 receives control of flight from a device external to the aircraft 1 or transmits flight monitoring data indicating a flight state to a device external to the aircraft 1 by the wireless communication device 100. . As flight monitoring data, for example, an image captured by the camera 40 may be mentioned.

  The flight control unit 10 includes an authentication information storage unit 12. The authentication information storage unit 12 stores authentication information of the aircraft 1. The authentication information of the aircraft 1 is information unique to the aircraft 1. The authentication information of the aircraft 1 is provided to an authentication server (not shown) that authenticates the aircraft 1, whereby the authentication server authenticates the aircraft 1.

  The function of the flight control unit 10 may be realized by dedicated hardware, or may be configured by a CPU (Central Processing Unit) and a memory, and the function of the flight control unit 10 is realized. The function may be realized by the CPU executing a computer program for performing the process.

  The power supply unit 80 includes a battery which is a power supply of the flying object 1 and a power supply monitoring unit which monitors the remaining charge amount of the battery. The power supply unit 80 notifies the flight control unit 10 of the remaining charge amount of the battery. The flight control unit 10 executes a predetermined flight control process based on the charge remaining amount of the battery notified from the power supply unit 80. For example, the flight control unit 10 controls the flight of the aircraft 1 so as to return to the original place where the flight was started, when the charge remaining amount of the battery becomes less than a predetermined threshold.

  FIG. 3 is a block diagram showing an example of the hardware configuration of the wireless communication apparatus 100 according to the present embodiment. In FIG. 3, the wireless communication device 100 includes a CPU 101, a storage unit 102, a wireless unit 103, and a positioning unit 104. These units are configured to exchange data.

  The CPU 101 controls the wireless communication device 100. This control function is realized by the CPU 101 executing a computer program. The storage unit 102 stores computer programs executed by the CPU 101 and various data.

  The wireless unit 103 receives a wireless signal transmitted from a wireless base station. The wireless unit 103 transmits a wireless signal received by the wireless base station. The wireless unit 103 wirelessly connects to a wireless base station. The wireless communication apparatus 100 communicates with a wireless base station to which the wireless unit 103 wirelessly connects.

  The positioning unit 104 measures the position of the wireless communication device 100, and outputs a positioning value of the measurement result. The positioning value indicates the position in the horizontal direction (latitude and longitude). For example, GPS may be used as the positioning unit 104.

  The functions of the wireless communication device 100 are realized by the CPU 101 executing a computer program. The wireless communication device 100 may be configured using a general-purpose computer device, or may be configured as a dedicated hardware device. The wireless communication device 100 may be, for example, a mobile communication terminal device such as a smartphone.

  FIG. 4 is a block diagram showing an example of a functional configuration of the wireless communication apparatus 100 according to the present embodiment. In FIG. 4, the wireless communication device 100 includes a wireless measurement unit 121, a cell counting unit 122, a communication control unit 123, a horizontal position information acquisition unit 124, an aircraft movement direction determination unit 125, and an authentication request unit 126. And a data storage unit 140. The data storage unit 140 stores handover parameter candidate data 141, parameter change area information 142, and an adjacent cell list 143. Data storage unit 140 is provided in storage unit 102 of wireless communication apparatus 100.

  The wireless measurement unit 121 measures a wireless quality indicator value based on the wireless signal received by the wireless unit 103. The wireless quality indicator value is an indicator value of the wireless communication quality of the wireless communication device 100. The wireless quality indicator values include, for example, received signal strength indicator (RSSI), received signal strength (SINR), signal to interference noise power ratio (SINR), reference signal received power (RSRP), and the like. It is.

  The cell counting unit 122 counts the number of cells of the wireless base station identified by the wireless signal received by the wireless unit 103. Hereinafter, an example of a cell identification method in which the cell counting unit 122 identifies the cell of the radio base station will be described.

(Example 1 of cell identification method)
In Example 1 of the cell identification method, the cell of the wireless base station is identified by the frequency of the wireless signal received by the wireless unit 103. When the frequency of the first wireless signal received by the wireless unit 103 is different from the frequency of the second wireless signal, the cell counting unit 122 determines whether the first cell of the first wireless signal and the second cell of the second wireless signal are different. Detect 2 cells.

(Example 2 of cell identification method)
In example 2 of the cell identification method, the cell of the wireless base station is identified by the identification information (cell ID) of the cell indicated by the wireless signal received by the wireless unit 103. When the first cell ID of the first wireless signal received by the wireless unit 103 is different from the second cell ID of the second wireless signal, the cell counting unit 122 determines whether the first cell ID and the second cell ID of the first cell ID are different. Detect two cells with the second cell of

(Example 3 of cell identification method)
In Example 3 of the cell identification method, the cell of the wireless base station is identified by the frequency of the wireless signal received by the wireless unit 103 and the cell ID indicated by the wireless signal. When the first cell ID of the first wireless signal and the second cell ID of the second wireless signal are different for each frequency of the wireless signal received by the wireless unit 103, the cell counting unit 122 determines whether the first cell ID Two cells of one cell and the second cell of the second cell ID are detected.

  The cell to be counted by the cell counting unit 122 may be limited by the reception strength of the wireless signal. For example, among the radio signals received by the radio unit 103, only cells identified by the radio signal whose received signal strength is within a predetermined range (cell counting target condition range) are counted by the cell counting unit 122. May be The reception strength of the wireless signal is, for example, RSSI, RSRP, or the like. The cell count target condition range is, for example, a range of candidate conditions of handover destination.

  The communication control unit 123 controls communication performed using the wireless unit 103. As one control of communication performed using the wireless unit 103, the communication control unit 123 changes a communication partner selection method for selecting a wireless base station of a communication partner from among a plurality of wireless base stations of communication partner candidates. An example of the communication partner selection method according to the present embodiment is to change a handover parameter for controlling a handover between a plurality of communication partner candidate wireless base stations. Another example of the communication partner selecting method according to the present embodiment is to change the number of wireless base stations performing communication simultaneously among a plurality of wireless base stations of communication partner candidates.

  The communication control unit 123 changes the communication party selection method to a predetermined sky communication party selection method when the rise determination condition for determining that the aircraft 1 has risen above the ground is satisfied. The over-the-air communication partner selection method is a communication partner selection method suitable when the airframe 1 (the wireless communication device 100) is present in the sky. The communication control unit 123 changes the communication partner selection method to a predetermined ground communication partner selection method when the descent determination condition for judging that the aircraft 1 has dropped from the sky to the ground is satisfied. The ground communication partner selection method is a communication partner selection method suitable when the airframe 1 (the wireless communication device 100) exists on the ground. The details of the communication control method in which the communication control unit 123 changes the communication party selection method will be described later.

  The horizontal position information acquisition unit 124 acquires horizontal position information indicating the position of the aircraft 1 in the horizontal direction. As an example of the present embodiment, the horizontal position information acquisition unit 124 acquires the positioning value of the positioning unit 104 of the wireless communication device 100 mounted on the aircraft 1. The positioning value of the positioning unit 104 of the wireless communication device 100 mounted on the aircraft 1 is horizontal position information indicating the position of the aircraft 1 in the horizontal direction.

  The horizontal position information acquisition unit 124 may use the flight positioning unit 30 of the aircraft 1. In this case, the wireless communication device 100 acquires the horizontal position (latitude and longitude) of the positioning value of the flight positioning unit 30 via the flight control unit 10. When the horizontal position information acquisition unit 124 uses the flight positioning unit 30 of the aircraft 1, the wireless communication device 100 may include the positioning unit 104 or may not include the positioning unit 104.

  The flying object moving direction determination unit 125 determines whether the moving direction of the flying object 1 is vertical or horizontal. For example, the flying object movement direction determination unit 125 determines the positioning value (“horizontal position (latitude and longitude)”) and “vertical position (altitude) of the flight positioning unit 30 of the aircraft 1 via the flight control unit 10 Is acquired, and it is determined whether the moving direction of the aircraft 1 is the vertical direction or the horizontal direction based on the positioning value. Note that the wireless communication device 100 includes an acceleration sensor and a gyro sensor, and the flying object movement direction determination unit 125 determines whether the moving direction of the flying object 1 is vertical or horizontal based on the detection results of these sensors. You may decide

  The authentication request unit 126 acquires the authentication information of the aircraft 1 from the authentication information storage unit 12 of the flight control unit 10 provided in the aircraft 1, and transmits the authentication information to the authentication server that authenticates the aircraft 1. Request authentication of the aircraft 1 concerned. The authentication request unit 126 receives a response (pass or fail of authentication) to the request for authentication of the airframe 1 from the authentication server.

The data storage unit 140 stores handover parameter candidate data 141, parameter change area information 142, and an adjacent cell list 143.
The handover parameter candidate data 141 will be described with reference to FIG. FIG. 5 is a view showing a configuration example of the handover parameter candidate data 141 according to the present embodiment. In FIG. 5, the handover parameter candidate data 141 has a plurality of (three in the example of FIG. 5) handover (HO) parameter sets. The HO parameter set is a set of handover parameters for controlling handover between a plurality of radio base stations of communication candidate candidates. The combination of handover parameters included in the HO parameter set in FIG. 5 is an example, and the combination of handover parameters included in the HO parameter set is arbitrarily set according to the wireless communication system to be applied.

  Also, the HO parameter set has an HO parameter set application condition. The HO parameter set application condition of a certain HO parameter set is a condition to which the HO parameter set is applied. For example, the HO parameter set application condition “HO candidate cell number <5” of the HO parameter set 1 indicates that the HO parameter set 1 is applied when the number of HO candidate cells is less than five.

  The parameter change area information 142 will be described with reference to FIG. FIG. 6 is a diagram showing a configuration example of the parameter change area information 142 according to the present embodiment. In FIG. 6, the parameter change area information 142 has a cell ID (parameter change area cell ID) of a cell of an area for which a handover parameter is to be changed.

The adjacent cell list 143 will be described with reference to FIG. FIG. 7 is a diagram showing a configuration example of the adjacent cell list 143 according to the present embodiment. The adjacent cell list 143 is provided to the wireless communication apparatus 100 from the wireless base station to which the wireless unit 103 wirelessly connects. The wireless communication apparatus 100 receives the adjacent cell list 143 from the wireless base station to which the wireless unit 103 wirelessly connects, and stores the adjacent cell list 143 in the data storage unit 140. In FIG. 7, in the adjacent cell list 143, the cell ID (connected cell ID) of the radio base station of the provision source of the adjacent cell list 143 is described. The adjacent cell list 143 includes the cell ID (adjacent cell ID) of the cell adjacent to the cell of the connection cell ID and the use frequency information indicating the radio frequency used by the cell of the adjacent cell ID in association with the adjacent cell ID. be written.
Note that the wireless base station may provide the wireless communication apparatus 100 with a plurality of adjacent cell lists 143 according to the altitude. For example, the radio base station may provide the radio communication apparatus 100 with the adjacent cell list 143 for the ground and the adjacent cell list 143 for the air. This is because there is a possibility that cells adjacent to the cell of the same radio base station may change on the ground and in the sky. When the wireless communication apparatus 100 exists on the ground, the connected cell ID of the cell adjacent to the cell of the wireless base station is described in the ground adjacent cell list 143 provided by the wireless base station. When the wireless communication apparatus 100 exists in the sky, the connected cell ID of the cell adjacent to the cell of the wireless base station is described in the air-space adjacent cell list 143 provided by the wireless base station. The wireless communication apparatus 100 uses the adjacent cell list 143 for the ground when it is determined to exist on the ground, and uses the adjacent cell list 143 for the upper air when determined to exist in the sky. Thereby, the accuracy of selection of the communication partner of the wireless communication apparatus 100 can be improved.
Further, in order to transmit the adjacent cell list 143 for airborne use only to the flying object 1, the wireless base station determines whether the wireless communication device 100 is mounted on the flying object 1 according to the identification information of the wireless communication device 100. You may judge. For example, the wireless base station transmits only the adjacent cell list 143 for the ground to the wireless communication device 100 not mounted on the aircraft 1, while the wireless communication device 100 mounted on the aircraft 1 transmits the ground. Both adjacent and empty neighbor cell lists 143 may be transmitted. The identification information of the wireless communication device 100 is, for example, unique information of a SIM (Subscriber Identity Module) card included in the wireless communication device 100.
Also, the wireless base station transmits both the ground and air adjacent cell lists 143 when a certain wireless communication device 100 connects to a cell of a predetermined cell ID without particularly distinguishing the wireless communication device 100. May be The predetermined cell ID is, for example, a cell ID of a cell through which the flight route of a specific vehicle 1 passes in the coverage.

  Next, Examples 1, 2, and 3 of the communication control method according to the present embodiment will be sequentially described with reference to FIGS.

[Example 1 of communication control method]
An example 1 of the communication control method according to the present embodiment will be described with reference to FIG. FIG. 8 is a flowchart of an example 1 of the communication control method according to the present embodiment. In Example 1 of the communication control method, when the increase or decrease in the predetermined number of cells per unit time in the counting result of the cell counting unit 122 is equal to or larger than the predetermined threshold, the communication control unit 123 The communication partner selection method for selecting a communication base station from among the candidate base stations is changed.

  The communication control process of FIG. 8 is started at the start of the flight of the aircraft 1. For example, in the airframe 1, when a flight start signal indicating the start of the flight of the airframe 1 is input from the flight control unit 10 to the wireless communication device 100, the wireless communication device 100 starts the process of FIG. Alternatively, the wireless communication apparatus 100 may start the process of FIG. 8 by instructing the wireless communication apparatus 100 to start the communication control process of FIG. 8 from the apparatus outside the aircraft 1 by communication.

(Step S11) The communication control unit 123 activates the measurement period timer T1. The measurement period timer T1 is a timer that counts a predetermined period (measurement period) in which the number of increases or decrease in the number of cells per unit time as the counting result of the cell counting unit 122 is measured. The timer period of the measurement period timer T1 is preset. The operator can arbitrarily set the timer period of the measurement period timer T1. For example, the operator may determine the timer period of the measurement period timer T1 in accordance with the scheduled rising and falling speeds of the aircraft 1. As an example of the method of determining the timer period of the measurement period timer T1, the timer period of the measurement period timer T1 is shortened as the scheduled rising speed and the falling speed of the aircraft 1 increase.

(Step S12) The communication control unit 123 resets the cell counting unit 122 and starts the unit time timer T2. By resetting the cell counting unit 122, the cell count value SUM of the cell counting unit 122 is reset to zero. The unit time timer T2 is a timer that counts a unit time for measuring the number of cells per unit time of the counting result of the cell counting unit 122. The timer period of the unit time timer T2 is preset. The operator can arbitrarily set the timer period of the unit time timer T2. However, the timer period of the unit time timer T2 is shorter than the timer period of the measurement period timer T1.

(Step S13) The wireless unit 103 receives a wireless signal transmitted from a wireless base station.

(Step S14) The cell counting unit 122 determines whether there is an addition (additional cell) of the cell of the wireless base station identified by the wireless signal received by the wireless unit 103. This cell identification method is preset. For example, according to the communication system of the wireless base station existing around the flight location of the flying object 1, the worker may use the method of any one of the above-described cell identification methods of Example 1, Example 2 or Example 3 as a wireless communication device. Set to 100. If there is an additional cell, the process proceeds to step S15. If there is no additional cell, the process proceeds to step S16.

(Step S15) The cell counting unit 122 adds the number of additional cells (the number of additional cells) to the cell count value SUM.

(Step S16) The communication control unit 123 determines the expiration of the unit time timer T2. If the unit time timer T2 has expired, the process proceeds to step S17. If not, the process proceeds to step S18.

(Step S17) The communication control unit 123 associates the cell count value SUM with the current time (measurement time) and records it as the number of cells per unit time at the measurement time.

(Step S18) The communication control unit 123 determines the expiration of the measurement period timer T1. If the measurement period timer T1 has expired, the process proceeds to step S19. If the measurement period timer T1 has not expired, the process returns to step S12, and the measurement of the number of cells per unit time is performed.

(Step S19) The communication control unit 123 calculates the number of increase or decrease of the number of cells per unit time in the current measurement period (the timer period of the measurement period timer T1) based on the recording of the number of cells per unit time. As a result, when the number of cells per unit time increases during the measurement period of this time, the number of increase in the number of cells per unit time is calculated, while when the number of cells per unit time decreases, the number of cells per unit time The reduction number of is calculated.

(Step S20) The communication control unit 123 determines whether the increase or decrease number of the number of cells per unit time of the calculation result is equal to or more than a predetermined threshold value. The threshold is set in advance. The threshold can be arbitrarily set by the worker. For example, the worker may determine the threshold according to the predetermined rising and falling speeds of the aircraft 1. As an example of the method of determining the threshold, the threshold is reduced as the scheduled rising speed and the falling speed of the aircraft 1 increase. As a result of the determination in step S20, if it is equal to or greater than the threshold value, the process proceeds to step S21, and if not, the process proceeds to step S22.

(Step S21) The communication control unit 123 changes the communication party selection method. An example of a method of changing the communication party selection method will be shown below.

(Example 1 of the method of changing the communication partner selection method)
The communication control unit 123 changes the communication partner selection method to a predetermined communication partner selection method for space when the number of increases in the number of cells per unit time is equal to or greater than a predetermined increase determination threshold (when the increase determination condition is satisfied). . As an example of the method of determining the rising determination threshold value, the value is determined to be larger than the number of increase in the number of cells per unit time on the ground of the flight location of the aircraft 1. If the rise determination condition is satisfied, it can be determined that the aircraft 1 has risen above the ground. As a result, the communication control unit 123 changes the communication partner selection method to a method for selecting a communication partner for air communication that is suitable when the aircraft 1 (the wireless communication device 100) is in the air.
In addition, the other example of a raise judgment condition is shown below.
(Another example 1 of the rising judgment condition)
The number of cells per unit time continues in a predetermined period.
(Another example 2 of the rising judgment condition)
Although the radio wave strength of the cell (adjacent cell) adjacent to the cell of the wireless base station (connected base station) to which the wireless communication apparatus 100 is connected is increased, the radio wave strength of the cell of the connected base station is decreased Having detected that
(Another example 3 of the rising judgment condition)
The increase number or the absolute number of the number of cells per unit time of cells other than the adjacent cells is equal to or more than a predetermined threshold.
(Another example 4 of the rise judgment condition)
The threshold value used for the ascending judgment condition is set in accordance with the flight area of the aircraft 1. The threshold value used for the rise determination condition may differ depending on the flight area of the aircraft 1.

(Example 2 of the change method of the other party selection method)
The communication control unit 123 changes the communication partner selection method to a predetermined ground communication partner selection method when the number of decreases in the number of cells per unit time is equal to or more than the predetermined descent determination threshold (when the descent determination condition is satisfied). . As an example of the determination method of the descent determination threshold value, it is determined to be a large value as compared to the decrease number of the number of cells per unit time on the ground of the flight location of the aircraft 1. If the descent determination condition is satisfied, it can be determined that the aircraft 1 has descended from the upper air to the ground. Thus, the communication control unit 123 changes the communication partner selection method to a ground communication partner selection method suitable for the case where the aircraft 1 (the wireless communication device 100) is present on the ground.
In addition, the other example of a fall judgment condition is shown below.
(Another example 1 of the descent judgment condition)
The number of cells per unit time continues in a predetermined period.
(Another example 2 of the falling judgment condition)
Even though the field strength of the adjacent cell is decreasing, it is detected that the field strength of the connected base station cell is increasing.
(Another example 3 of the falling judgment condition)
The decrease number or the absolute number of the number of cells per unit time of cells other than the adjacent cells is equal to or more than a predetermined threshold.
(Another example 4 of the falling judgment condition)
The threshold value used for the descent judgment condition is set in accordance with the flight area of the aircraft 1. The threshold used for the down determination condition may differ depending on the flight area of the aircraft 1.

(Step S22) The wireless communication device 100 determines the end of the process. For example, when an end-of-flight signal indicating the end of the flight of the flying object 1 is input from the flight control unit 10 to the wireless communication device 100 in the flying object 1, the wireless communication device 100 ends the process of FIG. Alternatively, the wireless communication apparatus 100 may end the process of FIG. 8 by instructing the wireless communication apparatus 100 to end the communication control process of FIG. 8 by communication from a device external to the aircraft 1. If it is determined that the process ends, the process of FIG. 8 ends. If it is not the end of the process, the process returns to step S11, and the next measurement period is started.

[Example 2 of communication control method]
Example 2 of the communication control method according to the present embodiment will be described with reference to FIG. FIG. 9 is a flowchart of an example 2 of the communication control method according to the present embodiment. In Example 2 of the communication control method, when there is a cell not present in the adjacent cell list 143 among the cells of the wireless base station identified by the wireless signal received by the wireless unit 103, the communication control unit 123 The communication partner selection method for selecting the communication base station from among the communication base station candidate radio base stations is changed.

  The communication control process of FIG. 9 is started at the start of the flight of the aircraft 1. For example, when a flight start signal indicating the start of the flight of the flying object 1 is input from the flight control unit 10 to the wireless communication device 100 in the flying object 1, the wireless communication device 100 starts the process of FIG. Alternatively, the wireless communication apparatus 100 may start the process of FIG. 9 by instructing the wireless communication apparatus 100 to start the communication control process of FIG. 9 by communication from a device external to the aircraft 1.

(Step S31) The wireless unit 103 receives a wireless signal transmitted from a wireless base station.

(Step S32) The communication control unit 123 refers to the adjacent cell list 143. The referenced adjacent cell list 143 (reference target adjacent cell list 143) is the adjacent cell list 143 in which the same connected cell ID as the cell ID of the wireless base station to which the wireless unit 103 wirelessly connects is described.

(Step S33) The communication control unit 123 determines whether a cell (non-adjacent cell) not present in the reference target adjacent cell list 143 exists in the cells of the wireless base station identified by the wireless signal received by the wireless unit 103. To judge. As a result of this determination, if there is a non-adjacent cell, the process proceeds to step S34, and if not, the process proceeds to step S35.
Note that, as non-adjacent cells, non-adjacent cells having a radio wave intensity lower than a predetermined radio wave intensity may be targeted as non-adjacent cells to be determined.
In addition, as a condition (non-adjacent cell determination condition) for determining that a non-adjacent cell is present, the example of the non-adjacent cell determination condition shown below may be applied.
(Example 1 of non-adjacent cell judgment condition)
Non-adjacent cells exist continuously for a predetermined period.
(Example 2 of non-adjacent cell judgment condition)
The number of non-adjacent cells is equal to or greater than a predetermined threshold.
(Example 3 of non-adjacent cell judgment condition)
It is determined that a non-adjacent cell does not exist only when a non-adjacent cell does not continuously exist for a predetermined period, and in other cases, it is determined that a non-adjacent cell exists.

  Examples 1 and 2 of the non-adjacent cell judgment conditions described above may be applied alone or in combination. In addition, information on which non-adjacent cell determination condition to which the wireless communication apparatus 100 applies may be provided to the wireless communication apparatus 100 from the wireless base station to which the wireless communication apparatus 100 is connected.

(Step S34) The communication control unit 123 changes the communication party selection method to a predetermined vacant communication party selection method. This is because it is more clear in the sky than on the ground, so it is considered that the radio signals of non-adjacent cells not present in the reference target adjacent cell list 143 are more likely to be received from far away than on the ground. It is.

(Step S35) The wireless communication device 100 determines the end of the process. For example, when an end-of-flight signal indicating the end of the flight of the flying object 1 is input from the flight control unit 10 to the wireless communication device 100 in the flying object 1, the wireless communication device 100 ends the process of FIG. Alternatively, the wireless communication device 100 may end the process of FIG. 9 by instructing the wireless communication device 100 to end the communication control process of FIG. 9 by communication from a device external to the aircraft 1. If it is determined that the process ends, the process of FIG. 9 ends. If it is not the end of the process, the process returns to step S31, and the process of FIG. 9 is continued.

[Example 3 of communication control method]
Example 3 of the communication control method according to the present embodiment will be described with reference to FIG. FIG. 10 is a flowchart of an example 3 of the communication control method according to the present embodiment. In Example 3 of the communication control method, when the wireless quality index value of the measurement result of the wireless measurement unit 121 satisfies the predetermined sky index condition, the communication control unit 123 performs communication from among the wireless base stations of the plurality of communication partner candidates. Change the communication partner selection method to select the other radio base station.

  The communication control process of FIG. 10 is started at the start of the flight of the aircraft 1. For example, when a flight start signal indicating the start of the flight of the flying object 1 is input from the flight control unit 10 to the wireless communication device 100 in the flying object 1, the wireless communication device 100 starts the process of FIG. Alternatively, the wireless communication apparatus 100 may start the process of FIG. 10 by instructing the wireless communication apparatus 100 to start the communication control process of FIG. 10 by communication from a device external to the aircraft 1.

(Step S41) The wireless unit 103 receives a wireless signal transmitted from a wireless base station.

(Step S42) The wireless measurement unit 121 measures, based on the wireless signal received by the wireless unit 103, the wireless quality indicator value of the cell of the wireless base station (connected base station) to which the wireless communication apparatus 100 is connected. . The radio quality indicator value to be measured may be, for example, any one or more of RSSI, RSRP and SINR.
(Step S43) The communication control unit 123 determines whether the wireless quality indicator value of the measurement result of the wireless measurement unit 121 satisfies a predetermined sky indicator condition. The sky index condition is a condition for determining that the aircraft 1 (the wireless communication device 100) exists in the sky. The following is an example of the sky index condition.

(Example 1 of the sky index condition)
When the wireless quality indicator value is the RSSI, the sky indicator condition is that the RSSI measurement value is equal to or higher than the sky RSSI judgment threshold value. As an example of the determination method of the over-the-air RSSI judgment threshold value, it is determined to be a large value as compared to the measured value of the RSSI on the ground of the flight location of the aircraft 1. This is because it is thought that the RSSI will increase more than the ground, since the sky is clearer than the ground.

(Example 2 of the sky index condition)
When the wireless quality indicator value is RSRP, the sky indicator condition is that the measurement value of RSRP is equal to or greater than the sky RSRP determination threshold. As an example of the determination method of the sky RSRP determination threshold value, it is determined to be a large value as compared to the measurement value of RSRP on the ground of the flight location of the aircraft 1. This is because RSRP is considered to increase more than the ground, since the sky is clearer than the ground.

(Example 3 of the sky index condition)
When the radio quality indicator value is SINR, the sky indicator condition is that the measured value of SINR is less than the sky SINR determination threshold. As an example of the determination method of the airborne SINR determination threshold value, the value is determined to be smaller than the measured value of SINR on the ground of the flight location of the aircraft 1. This is because the sky is clearer than the ground, so that both the desired wave and the interference wave may increase the received power, but the interference wave is more increased than the desired wave than the ground. It is because SINR is considered to deteriorate more than the ground according to

When a plurality of the RSSI, RSRP, and SINR are used as the radio quality index value, the above examples of the corresponding sky index conditions are combined and used. In this case, all the wireless quality index values may satisfy the sky index condition as a condition that the determination in step S43, "Is the sky index condition satisfied?" Becomes "YES", or any of a plurality of wireless quality indicators A condition that the sky index condition of the value is satisfied may be a condition that the judgment of step S43 "Is the sky condition index condition satisfied?" Becomes "YES", or that at least one wireless quality index value sky condition index condition satisfied. It may be set as the condition that the judgment of the step S43 "is the upper sky index condition satisfied?" Becomes "YES". The condition for which the determination of the upper sky condition is satisfied? Is "YES" may be determined according to the radio environment of the flight location of the aircraft 1, for example.
In addition, the communication control unit 123 has a tendency that the change indicated by the measured value of RSSI or the measured value of RSRP, or both of the measured value of RSSI and the measured value of RSRP is different from the change indicated by the measured value of SINR. In addition, it may be determined that the aircraft 1 is in the upper air. For example, when the tendency of change indicated by the measured value of RSSI or the measured value of RSRP, or both the measured value of RSSI and the measured value of RSRP is an increase, the change tendency indicated by the measured value of SINR is a decrease. Sometimes, the communication control unit 123 may determine that the aircraft 1 is in the upper air.
Also, the communication control unit 123 may use the sky index condition based on the movement direction or position of the aircraft 1. An example of the sky index condition is shown below.
(Example 4 of the sky index condition)
If the measured value of RSSI or the measured value of RSRP, or both the measured value of RSSI and the measured value of RSRP increase while the flying object 1 is not moving in the horizontal direction, the flying object 1 is flying above It is judged that it exists in
(Example 5 of the sky index condition)
If the measured value of RSSI or the measured value of RSRP, or both the measured value of RSSI and the measured value of RSRP are equal to or greater than a predetermined threshold which can not be obtained on the ground corresponding to the position of the aircraft 1, It is determined that the body 1 is in the upper sky.

  As a result of the determination in step S43, if the upper sky index condition is satisfied, the process proceeds to step S44. If not, the process proceeds to step S45.

(Step S44) The communication control unit 123 changes the communication party selection method to a predetermined vacant communication party selection method.

(Step S45) The wireless communication device 100 determines the end of the process. For example, when an end-of-flight signal indicating the end of the flight of the flying object 1 is input from the flight control unit 10 to the wireless communication device 100 in the flying object 1, the wireless communication device 100 ends the process of FIG. Alternatively, the wireless communication device 100 may end the process of FIG. 10 by instructing the wireless communication device 100 to end the communication control process of FIG. 10 by communication from a device external to the aircraft 1. If it is determined that the process is ended, the process of FIG. 10 is ended. If it is not the end of the process, the process returns to step S41, and the process of FIG. 10 is continued.

  Next, an example of the communication party selection method according to the present embodiment will be described.

[Example 1 of communication partner selection method]
An example 1 of the communication partner selection method is to change a handover parameter for controlling handover between a plurality of wireless base stations of communication partner candidates. In the sky, a situation occurs in which radio base stations with the same level of reception quality, which are candidates for handover, are increased more than on the ground. As a result, the occurrence of a handover failure such as a handover failure or frequent handover may cause the communication of the wireless communication apparatus 100 existing in the sky to be unstable. Therefore, in the first example of the communication partner selection method, occurrence of a handover failure is suppressed by changing the handover parameter, and the communication of the wireless communication apparatus 100 existing in the sky is prevented from becoming unstable. Below, an example of the method of changing the handover parameter is given.

(Example 1 of the method of changing the handover parameter)
The trigger time (Time To Trigger: TTT) in the sky (over air communication partner selection method) is made longer than the value of the ground (ground communication partner selection method). TTT is a protection time from when the transmission condition of the measurement report that triggers the handover is satisfied in the wireless communication apparatus 100 to when the wireless communication apparatus 100 transmits the measurement report. The longer the TTT, the more effective the handover is suppressed. As an example of the method of determining the value of TTT in the sky, the value is determined to be larger than the value of TTT on the ground of the flight location of the first flying object.

(Example 2 of the method of changing the handover parameter)
In the sky (over-air communication partner selection method), the handover is prohibited. For example, set TTT to infinity. Thus, no handover occurs. The time for which handover is prohibited (handover prohibition time) may be limited to a certain time. The handover inhibition time is set in advance.

The communication control unit 123 may acquire the handover parameter candidate from the wireless base station accessed from the flight location of the aircraft 1. The radio base station of each flight location holds the candidate for the handover parameter suitable for the ground and the candidate for the handover parameter suitable for the sky at the flight location. For example, the handover parameter candidate data 141 illustrated in FIG. 5 is held. The communication control unit 123 can suppress the occurrence of a handover failure by acquiring and using handover parameter candidates (for example, handover parameter candidate data 141) from a wireless base station accessed from the flight location of the aircraft 1 it can. Also, as in the case of the handover parameter candidate, the communication control unit 123 may acquire information indicating the handover prohibition time from the radio base station accessed from the flight location of the aircraft 1.
The handover inhibition time may be variable according to the moving speed of the aircraft 1. For example, the handover prohibition time may be shortened as the moving speed of the aircraft 1 in the horizontal direction is higher. This is because the wireless environment changes in a shorter time as the moving speed of the aircraft 1 in the horizontal direction increases, so the handover prohibition time is shortened to facilitate adaptation to the change in the wireless environment.
Further, the wireless communication apparatus 100 may include a plurality of handover parameter candidates, and may change the handover parameter candidates to be used according to the moving speed of the aircraft 1.

[Example 2 of communication partner selection method]
An example 2 of the communication partner selection method is to change the number of wireless base stations (the number of simultaneous communication base stations) that simultaneously perform communication among a plurality of wireless base stations of communication partner candidates. In the sky, a situation occurs in which radio base stations with the same level of reception quality increase more than on the ground. From this, the communication speed of the wireless communication apparatus 100 can be improved by increasing the number of wireless base stations with which the wireless communication apparatus 100 existing in the sky simultaneously communicates with that on the ground to perform cooperative communication with a plurality of base stations. Communication reliability can be improved. As an example of a method of determining the number of simultaneous communication base stations of the wireless communication device 100 existing in the sky (a method of selecting an air communication partner), the actual value of the number of simultaneous communication base stations on the ground of the flight location of the aircraft 1 (ground communication The value is determined to be larger than the other party's selection method).

  Next, a modification according to the present embodiment will be described.

[Modification 1 of this embodiment]
The authentication request unit 126 acquires the authentication information of the aircraft 1 from the authentication information storage unit 12 of the flight control unit 10 provided in the aircraft 1, and transmits the authentication information to the authentication server that authenticates the aircraft 1. Request authentication of the aircraft 1 concerned. The authentication request timing of the aircraft 1 is, for example, a timing synchronized with the start of the flight of the aircraft 1. For example, when a flight start signal indicating the start of the flight of the flying object 1 is input from the flight control unit 10 to the wireless communication device 100 in the flying object 1, the authentication request unit 126 of the wireless communication device 100 authenticates the flying object 1 Make a request for Alternatively, the authentication request unit 126 of the wireless communication apparatus 100 requests the authentication of the aircraft 1 by instructing the wireless communication apparatus 100 to request the authentication of the aircraft 1 by communication from a device outside the aircraft 1. You may go. The authentication request unit 126 receives a response (pass or fail of authentication) to the request for authentication of the airframe 1 from the authentication server. The communication control unit 123 changes the method for selecting a communication party if the authentication request result of the aircraft 1 of the authentication request unit 126 is a pass of authentication, and the communication control unit 123 performs communication if the request result is a failure of authentication. Do not change the other party selection method. According to the first modification of the present embodiment, it is possible to ensure that only the wireless communication device 100 mounted on the aircraft 1 changes the communication partner selection method.

  Note that the flying object 1 authenticates the wireless communication device 100 using unique information of a SIM (Subscriber Identity Module) card included in the wireless communication device 100, and only the wireless communication device 100 that passes the authentication selects the other party of communication. A change of method may be implemented. Alternatively, the wireless base station to which the wireless communication apparatus 100 is connected may perform authentication of the wireless communication apparatus 100, and only the wireless communication apparatus 100 that has passed the authentication may change the communication partner selection method. For example, it is possible to encrypt information necessary for changing the communication partner selection method (for example, candidates for handover parameters), provide a decryption key only to the wireless communication apparatus 100 that has passed the authentication, and decrypt the encrypted information. You may

[Modification 2 according to the present embodiment]
The horizontal position information acquisition unit 124 acquires horizontal position information indicating the position of the aircraft 1 in the horizontal direction. The communication control unit 123 determines whether the moving range of the aircraft 1 is within a certain range based on the horizontal direction position information acquired by the horizontal direction position information acquiring unit 124. As an example of this determination method, when the size of the existing range of the position indicated by the horizontal position information (latitude, longitude) falls within a predetermined size, it is determined that the movement range of the aircraft 1 is a fixed range, If not, it is determined that the movement range of the aircraft 1 is not within the fixed range. When the communication control unit 123 determines that the movement range of the flying object 1 is a fixed range, the communication control unit 123 increases the measurement interval of the number of cells per unit time by a predetermined time (measurement standby time). As an example of a method of lengthening the measurement interval of the number of cells per unit time to a predetermined time, the cell counting unit 122 is reset in step S12 of the flowchart of the example 1 of the communication control method of FIG. After that, the unit time timer T2 is started, and the process proceeds to step S13. According to the second modification of the present embodiment, when the flying object 1 moves in a certain range and there is no change in the wireless environment, the frequency of measurement of the number of cells per unit time is reduced. Load reduction and power consumption reduction can be achieved.

[Modification 3 of this embodiment]
The flying object moving direction determination unit 125 determines whether the moving direction of the flying object 1 is vertical or horizontal. As an example of this determination method, the aircraft movement direction determination unit 125 uses the flight positioning unit 30 of the aircraft 1. The wireless communication device 100 acquires positioning values (“horizontal position (latitude and longitude)” and “vertical position (altitude)”) of the flight positioning unit 30 via the flight control unit 10. The flying object moving direction determination unit 125 calculates the amount of movement in the horizontal direction and the amount of movement in the vertical direction within a predetermined time based on the positioning value of the flight positioning unit 30. In the calculation result, when the amount of movement in the vertical direction is larger than the amount of movement in the horizontal direction, the aircraft movement direction determination unit 125 determines that the movement direction of the aircraft 1 is the vertical direction. On the other hand, when the amount of movement in the horizontal direction is larger than the amount of movement in the vertical direction in the calculation result, the aircraft movement direction determination unit 125 determines that the movement direction of the aircraft 1 is the horizontal direction.
The flight control unit 10 outputs a moving direction signal indicating the moving direction (vertical direction or horizontal direction) of the flying object 1, and the flying object moving direction determination unit 125 determines the moving direction (vertical direction or vertical direction) indicated by the moving direction signal. It may be determined that the horizontal direction is the moving direction of the aircraft 1.

  When the communication control unit 123 uses the airborne communication partner selecting method, if the movement direction of the aircraft 1 is horizontal according to the determination result of the aircraft movement direction judging unit 125, the communication partner selecting method is airborne. The communication partner selection method is changed to a predetermined communication partner selection method for airborne horizontal movement. The communication partner selection method for airborne horizontal movement is a communication partner selection method suitable when the aircraft 1 (the wireless communication device 100) is moving in the horizontal direction in the air. This is because even if the aircraft 1 is in the air, if the aircraft 1 (the wireless communication device 100) is moving in the horizontal direction, the wireless base stations of the transmission source of the wireless signal reaching the wireless communication device 100 are different one after another This is because it is preferable to use a communication partner selection method (overseas horizontal mobile communication partner selection method) suitable for the situation, as it changes to the wireless base station. The following is an example of the method for selecting a communication partner for airborne horizontal movement.

(Example 1 of communication partner selection method for airborne horizontal movement)
In Example 1 of the communication partner selecting method for the air horizontal movement, the communication partner selecting method for the air horizontal movement is the same as the communication partner selecting method for the ground. As described above, even if the aircraft is in the air, if the airframe 1 (the wireless communication device 100) is moving in the horizontal direction, the wireless base station of the transmission source of the wireless signal that reaches the wireless communication device 100 is one after another. Switch to a different wireless base station. Since this is considered to be similar to the situation of moving on the ground, the method for selecting the communication partner for ground communication is used for the communication partner selection method for upward horizontal movement.

(Example 2 of the method for selecting the communication partner for airborne horizontal movement)
In Example 2 of the communication partner selecting method for the airborne horizontal movement, the communication partner selecting method for the airborne horizontal movement is an intermediate method between the ground communication party selecting method and the airborne communication partner selecting method. For example, an intermediate value between the ground TTT and the sky TTT is set as the sky horizontal movement TTT. Alternatively, an intermediate value between the number of ground simultaneous communication base stations and the number of airborne simultaneous communication base stations is set as the number of airborne horizontal movement simultaneous communication base stations.

[Modification 4 of the present embodiment]
The communication control unit 123 refers to the parameter change area information 142 and, within the cell of the radio base station identified by the radio signal received by the radio unit 103, the parameter change area cell ID included in the parameter change area information 142 It is determined whether there is a cell with the same cell ID (parameter change area cell). As a result of this determination, the communication control unit 123 changes the communication party selection method when the parameter change area cell exists, and does not change the communication party selection method when the parameter change area cell does not exist. According to the fourth modification of the present embodiment, it is possible to specify an area in which the communication party selection method is to be changed.

[Modification 5 of this embodiment]
The communication control unit 123 acquires, from the flight control unit 10, charge remaining amount information indicating the charge remaining amount of the battery which is the power supply of the aircraft 1. The remaining charge information is notified from the power supply unit 80 to the flight control unit 10. The communication control unit 123 determines an increase judgment threshold of the condition for changing the communication party selection method to the sky communication party selection method when the charge remaining amount indicated by the charge remaining amount information is less than the predetermined charge remaining amount threshold. Reduce to the value of. As a result, since the airborne communication partner selection method is used quickly while the aircraft 1 (the wireless communication device 100) is rising, for example, handover failure or frequent occurrence of handover etc. due to the use of the airborne TTT. It can be suppressed to prevent the waste of the battery.

[Modification 6 of this embodiment]
When the number of cells per unit time of the counting result of the cell counting unit 122 is either an increase or a decrease continuously for a predetermined period, the communication control unit 123 selects a communication partner from among the plurality of wireless base stations of communication partner candidates. Change the communication partner selection method to select the wireless base station of The situation in which the number of cells per unit time of the counting result of the cell counting unit 122 continues to increase for a predetermined period is considered to be a situation in which the flying object 1 (the wireless communication device 100) is rising. This is because when the flying body 1 (the wireless communication device 100) is rising, the line of sight gradually improves, so the wireless base station that is the transmission source of the wireless signal that reaches the wireless communication device 100 reaches a certain altitude. It is because it keeps on increasing. From this, when the number of cells per unit time of the counting result of the cell counting unit 122 is continuously increased for a predetermined period, the communication control unit 123 changes the communication party selection method to the sky communication party selection method. In addition, when the flying body 1 (the wireless communication device 100) rises above a certain degree of altitude, the distance between the wireless communication device 100 and each wireless base station becomes too long, and this wireless communication device The source radio base station of the radio signal reaching 100 is ever decreasing.

  On the other hand, it is considered that the situation where the number of cells per unit time of the counting result of the cell counting unit 122 is continuously reduced for a predetermined period is a situation where the flying object 1 (the wireless communication device 100) is falling. This is because when the airframe 1 (the wireless communication device 100) is lowered, the line of sight gradually deteriorates, so the wireless base station of the transmission source of the wireless signal that reaches the wireless communication device 100 continues to decrease. It is from. From this, when the number of cells per unit time of the counting result of the cell counting unit 122 continues to decrease for a predetermined period, the communication control unit 123 changes the communication partner selection method to the ground communication partner selection method.

  The above is the description of the modification according to the present embodiment.

  According to the above-described embodiment, when the wireless communication device 100 exists in the air, the communication stability of the wireless communication device 100 existing in the air can be improved by using the communication party selection method for air communication. it can. Moreover, when the wireless communication apparatus 100 exists on the ground, it can return to the communication other party selection method for grounds. Therefore, in the case of applying the cellular network system constructed to provide the mobile communication service for the ground to the wireless communication device 100 mounted on the airframe 1, the wireless communication device 100 can be applied even in the air. It can contribute to providing stable communication. As a result, since the communication is stabilized when the aircraft 1 is remotely controlled by the communication by the wireless communication device 100, the effect of improving the reliability of remote control of the aircraft 1 can be obtained.

  Further, according to the above-described embodiment, it is possible to determine the ascent and descent of the aircraft 1 without using the measurement values of the altimeter. Thus, there is no need to convert, for example, handover parameter candidates in accordance with the altimeter measurement values.

  Although the embodiments of the present invention have been described in detail with reference to the drawings, the specific configuration is not limited to this embodiment, and design changes and the like within the scope of the present invention are also included.

  For example, the flying object on which the wireless communication device 100 according to the above-described embodiment is mounted may be an auto-piloted flying object, a remote-piloted flying object, or a person A pilot may be a manned flight that is controlled by a flight vehicle.

Alternatively, a computer program for realizing the functions of the respective devices described above may be recorded in a computer-readable recording medium, and the computer system may read and execute the program recorded in the recording medium. Note that the “computer system” referred to here may include an OS and hardware such as peripheral devices.
The “computer readable recording medium” is a writable non-volatile memory such as a flexible disk, an optical magnetic disk, a ROM, a flash memory, etc., a portable medium such as a DVD (Digital Versatile Disc), etc. Storage devices such as hard disks.

Furthermore, the “computer-readable recording medium” is a volatile memory (for example, DRAM (Dynamic Memory) inside a computer system that becomes a server or client when a program is transmitted via a network such as the Internet or a communication line such as a telephone line As Random Access Memory), it is assumed that the program which holds the program for a fixed time is included.
The program may be transmitted from a computer system in which the program is stored in a storage device or the like to another computer system via a transmission medium or by transmission waves in the transmission medium. Here, the “transmission medium” for transmitting the program is a medium having a function of transmitting information, such as a network (communication network) such as the Internet or a communication line (communication line) such as a telephone line.
Further, the program may be for realizing a part of the functions described above. Furthermore, it may be a so-called difference file (difference program) that can realize the above-described functions in combination with a program already recorded in the computer system.

DESCRIPTION OF SYMBOLS 1 ... Flight body, 10 ... Flight control part, 12 ... Authentication information storage part, 30 ... Flight positioning part, 40 ... Camera, 60 ... Motor, 80 ... Power supply part, 100 ... Wireless communication apparatus, 101 ... CPU, 102 ... Memory Unit 103 Radio unit 104 Positioning unit 121 Radio measurement unit 122 Cell counting unit 123 Communication control unit 124 Horizontal position information acquisition unit 125 Flight body movement direction judgment unit 126 Authentication request unit, 140 ... data storage unit

Claims (11)

In a wireless communication device mounted on a flying object,
A wireless unit that receives a wireless signal transmitted from a wireless base station;
An adjacent cell list storage unit that stores an adjacent cell list received from the wireless base station to which the wireless unit wirelessly connects;
When there is a cell not present in the adjacent cell list among the cells of the wireless base station identified by the wireless signal received by the wireless unit, communication is performed from among the wireless base stations of a plurality of communication partner candidates A communication control unit that changes a method of selecting a communication partner to select the wireless base station of the partner;
Wireless communication device comprising: The communication control unit changes the communication party selection method to a predetermined air communication party selection method.
The wireless communication device according to claim 1. The aircraft movement direction determination unit determines whether the movement direction of the aircraft is vertical or horizontal.
When the communication control unit uses the airborne communication partner selecting method, the communication partner selecting method is used when the moving direction of the aircraft is horizontal according to the judgment result of the aircraft movement direction judging unit. Changing the communication partner selection method for the sky from the communication partner selection method for the predetermined sky horizontal movement,
The wireless communication device according to claim 2. The communication partner selection method is to change a handover parameter for controlling a handover between the plurality of radio base stations of communication partner candidates.
The wireless communication device according to any one of claims 1 to 3. The communication control unit acquires the handover parameter candidate from the radio base station accessed from the flight location of the aircraft.
The wireless communication device according to claim 4. The communication partner selection method is to prohibit handover for a certain period of time,
The wireless communication device according to any one of claims 1 to 3. The communication control unit acquires, from the radio base station accessed from the flight location of the aircraft, information indicating the handover prohibited time.
The wireless communication device according to claim 6. The communication partner selection method is to change the number of the radio base stations performing communication simultaneously among the plurality of radio base stations of communication partner candidates.
The wireless communication device according to any one of claims 1 to 3. The authentication request unit further acquires authentication information of the aircraft from the authentication information storage unit of the aircraft, transmits the authentication information to an authentication server for authenticating the aircraft, and requests authentication of the aircraft. Equipped
The communication control unit changes the communication partner selection method when the authentication request result of the flight request by the authentication request unit is a pass of the authentication, and when the request result is a failure of the authentication. Do not change the communication partner selection method,
The wireless communication device according to any one of claims 1 to 8. A communication control method of a wireless communication device mounted on a flying object, comprising:
A wireless reception step in which the wireless communication apparatus receives a wireless signal transmitted from a wireless base station;
An adjacent cell list storing step of the adjacent cell list storage unit storing the adjacent cell list received from the wireless base station to which the wireless communication apparatus wirelessly connects;
When there is a cell not present in the adjacent cell list among the cells of the wireless base station identified by the wireless signal received by the wireless reception step, the wireless communication device may receive a plurality of communication partner candidates A communication control step of changing a communication partner selection method for selecting the wireless base station of the communication partner from among the wireless base stations;
Communication control method including: A computer of the wireless communication device, the wireless communication device being a wireless communication device mounted on a flying object, comprising: a wireless unit that receives a wireless signal transmitted from a wireless base station;
An adjacent cell list storing function of storing an adjacent cell list received from the wireless base station to which the wireless unit wirelessly connects;
When there is a cell not present in the adjacent cell list among the cells of the wireless base station identified by the wireless signal received by the wireless unit, communication is performed from among the wireless base stations of a plurality of communication partner candidates A communication control function of changing a method of selecting a communication partner to select the wireless base station of the partner;
Computer program to make it happen.

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