1 into a variable i (S107). Subsequently, the selection unit 13 determines whether there are a plurality of deployment candidates having the minimum evaluation value Yi (S108). If there is one deployment candidate having the minimum evaluation value Yi (N in S108), the selection unit 13 selects the deployment candidate (S109) and proceeds to step S113.

On the other hand, if there are a plurality of deployment candidates having the minimum evaluation value Yi (Y in S108), the selection unit 13 determines whether the value of the variable i matches i_max(S110). i_maxis a total number (here, 2) of the target existing base station 30 and the movable base station 20. If i does not match i_max(N in S110), the selection unit 13 adds 1 to i (S111) and repeats step S108 and the subsequent steps.

If i matches i_max(Y in S110), the selection unit 13 selects a deployment candidate of which the deployment order in FIG. 8 is the head (a deployment candidate number is the minimum) among deployment candidates having the minimum evaluation value Yi (S112), and proceeds to step S113. From step S106 and subsequent steps, the deployment candidate of which a maximum distance to the terminal 50 is smaller can be selected. In the example illustrated in FIG. 8, the deployment candidate of which the deployment candidate number is 7 is selected.

In step S113, the deployment unit 14 controls deployment of the movable base station 20 at a deployment position related to the deployment candidate selected in steps S105, S109 or S112. When the movable base station 20 is deployed, a state of the terminals 50 connected to respective base stations is as illustrated in, for example, FIG. 9. In FIG. 9, three terminals 50 are connected to the existing base station 30, and three terminals 50 are connected to the movable base station 20, and none of the base stations are congested (congestion of the existing base station 30 is eliminated).

As described above, according to the embodiment, it is possible to reduce a bias of the number of terminals connected to respective base stations. Thus, an improvement in communication quality can be expected.

Note that, although the example in which one existing base station 30 and one movable base station 20 are provided has been described, the first embodiment may be applied to a case in which a plurality of existing base stations 30 or a plurality of movable base stations 20 are provided. When the number of movable base stations 20 is plural, deployment candidates may be generated for each combination of deployment positions of the plurality of movable base stations 20.

Next, a second embodiment will be described. In the second embodiment, differences from the first embodiment will be described. Points which are not mentioned particularly in the second embodiment may be similar to those of the first embodiment.

In the second embodiment, an example in which the plurality of existing base stations 30 and the plurality of movable base stations 20 are provided (specifically, two existing base stations are provided) will be described. Further, in the second embodiment, by making not only the deployment position of each movable base station 20 but also the transmission power of each movable base station 20 variable, it is possible to search for a combination of the deployment positions and transmission power of the movable base station 20 for which a bias is small in the number of connected terminals.

FIG. 10 is a diagram illustrating a functional configuration example of the control station 10 according to the second embodiment. In FIG. 10, the same parts as those of FIG. 4 or corresponding portions to those in FIG. 4 are denoted by the same reference numerals. In the second embodiment, the control station 10 further includes a setting unit 15. The setting unit 15 is implemented by one or more programs installed in the control station 10 that causes the CPU 104 to execute processing.

FIG. 11 is a flowchart illustrating an example of a processing procedure performed by the control station 10 according to the second embodiment. In FIG. 11, the same steps as those in FIG. 5 are denoted by the same step numbers, and description thereof will be omitted.

In step S100, the generation unit 11 generates a plurality of combinations of a plurality of deployment candidates for each movable base station 20 and a plurality of transmission power adjustment amounts for each movable base station 20 (hereinafter referred to as “candidate patterns”) (S101). The transmission power adjustment amount is a reduction amount of relative power from the maximum transmission power. For example, since the transmission power which can be set is different depending on a country, a relative value is set based on the maximum value in the embodiment. However, an absolute value of the transmission power may be used instead of the transmission power adjustment amount.

FIG. 12 is a diagram illustrating an example of a candidate pattern. As illustrated in FIG. 12, one candidate pattern includes a candidate pattern number, a deployment candidate string, and a transmission power adjustment amount string. The candidate pattern number is an identification number of the candidate pattern. The deployment candidate string is a combination of deployment candidates (deployment candidate numbers) for each movable base station 20. For example, the first i of [1, 2] which is a deployment candidate string for the candidate pattern number=1 indicates the deployment candidate number for one movable base station 20, and the second 2 indicates the deployment candidate number for the other movable base station 20. The transmission power adjustment amount string is a combination of transmission power adjustment amounts for each movable base station 20. For example, a first 0 of [0, 0] which is a transmission power adjustment amount string for the candidate pattern number=1 indicates a transmission power adjustment amount for one movable base station 20, and a second 0 indicates a transmission power adjustment amount for the other movable base station 20.

In steps S102 and S103, the calculation unit 12 deploys each movable base station 20 at a deployment position indicated by a deployment candidate string related to the candidate pattern for each candidate pattern and calculates the parameters (a) to (c) when each movable base station 20 outputs transmission power indicated by a transmission power adjustment amount string related to the candidate pattern to calculate the evaluation value X. Note that the calculation unit 12 calculates (a) the number of terminals connected to the existing base station for each existing base station 30. The calculation unit 12 calculates (b) the number of terminals connected to the movable base station for each movable base station