Wireless communication system, control device, deployment control method, and program

Abstract

This wireless communication system comprises: one or more base station devices that communicate with one or more terminal devices; and a control device. The control device comprises: a layout calculation unit that calculates, in several ways, a plurality of layout patterns in which the plurality of base station devices are arranged in a target area; and a layout control unit that, for each layout pattern, calculates an evaluation index value based on the communication request of each terminal device, selects the layout pattern that results in the best evaluation index value, and controls the layout of the base station devices on the basis of the selected layout pattern.

Description

Technical Field

[0001] The present invention relates to a technique for dynamically arranging a base station device in a wireless communication system.

Background Art

[0002] In a wireless communication system, in order to efficiently secure area coverage, it is conceivable to arrange base station devices evenly in the area. However, in that case, due to the influence of terminal congestion, shielding, etc., it is conceivable that the communication quality in a specific area will deteriorate.

[0003] On the other hand, a technique for dynamically arranging a mobile base station device (a movable base station device) in an area where the communication quality has deteriorated to improve the deterioration of the communication quality has been studied (Non-Patent Document 1).

Prior Art Documents

Non-Patent Documents

[0004]

Non-Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0005] However, in the conventional dynamic arrangement technology of base station devices disclosed in Non-Patent Document 1 and the like, the arrangement of base station devices is performed based on the received power and SNR of terminal devices. Therefore, in the conventional technology, it is difficult to satisfy the communication requirements for terminal devices when different communication requirements occur for each terminal device.

[0006] The present invention has been made in view of the above points, and an object thereof is to provide a technique for arranging a base station device in consideration of the communication requirements of each terminal device. [Means for solving the problem]

[0007] According to the disclosed technology, a wireless communication system comprising one or more base station devices that communicate with one or more terminal devices, and a control device, The control device is A configuration calculation unit calculates multiple configuration patterns in which multiple base station devices are placed in the target area, For each deployment pattern, evaluation index values ​​based on the communication requests of each terminal device. Communication request completion rate Calculate, Communication request achievement rate The system includes a placement control unit that selects the placement pattern that yields the best value and performs placement control of the base station equipment based on the selected placement pattern, The deployment control unit calculates the base station communication resource utilization ratio for each terminal device by dividing the communication request throughput by the wireless transmission rate, and then calculates the communication request achievement rate using the said base station communication resource utilization ratio. A wireless communication system will be provided. [Effects of the Invention]

[0008] According to the disclosed technology, a technique is provided for arranging base station equipment that takes into account the communication requirements of each terminal device. [Brief explanation of the drawing]

[0009] [Figure 1] This figure shows an example of clustering. [Figure 2] This is a diagram illustrating the overview of the process. [Figure 3] This is a flowchart to explain the operation of the control device. [Figure 4] This is a diagram showing examples of base station equipment placement patterns. [Figure 5] This is a diagram showing examples of base station equipment placement patterns. [Figure 6] This is a diagram illustrating the method for calculating the communication request completion rate. [Figure 7] This diagram illustrates an example of the selection process for base station equipment placement patterns. [Figure 8] This figure shows an example of the device configuration. [Figure 9]This is a diagram showing an example of the hardware configuration of the device.

Embodiments for Carrying Out the Invention

[0010] Hereinafter, embodiments of the present invention (hereinafter referred to as "the present embodiments") will be described with reference to the drawings. The embodiments described below are merely examples, and the embodiments to which the present invention is applied are not limited to the following embodiments.

[0011] (Overview of the Embodiment) As a conventional technique for determining the arrangement (position) of the base station device 10 to which the terminal device 20 is connected, as shown in FIG. 1, clustering is performed on a plurality of terminal devices 20, and the position of the base station device is determined based on the received power or SNR of the terminal devices 20 in each cluster.

[0012] However, in the conventional technique, since the arrangement of the base station device 10 considering the communication requirements of each terminal device 20 was not performed, there were cases where the communication requirements could not be satisfied in many terminal devices 20.

[0013] Therefore, in the present embodiment, the control device 30 first prepares a plurality of base station device arrangement patterns. Specifically, for example, a plurality of arrangement patterns are generated by performing clustering a plurality of times while changing the initial value of the clustering. Then, the control device 30 calculates an evaluation index value (e.g., communication requirement achievement rate) based on the communication requirements of each communication terminal for each pattern, selects the base station device arrangement pattern with the best evaluation index value, and arranges the base station device 10 according to the base station device arrangement pattern. By such processing, the arrangement of the base station device 10 considering the communication requirements of the terminal device 20 can be easily derived. Hereinafter, the "base station device arrangement pattern" may be referred to as an "arrangement pattern" or a "pattern".

[0014] Referring to FIG. 2, the outline of the process when using the communication request achievement rate as an evaluation index value will be described. Note that the communication request achievement rate is the ratio of the number of terminal devices 20 that can satisfy the required communication quality when connected to the base station device 10 to the total number of terminal devices 20, and the calculation method thereof will be described later.

[0015] FIG. 2 shows three layout patterns. Any of the layout patterns shows a system configuration in which one or more base station devices 10 and one or more terminal devices 20 exist in the present embodiment. Also, it is assumed that the control device 30 performs control of the layout.

[0016] The base station device 10 may be a base station device in a cellular communication network (e.g., 3G, 4G / LTE, 5G, 6G), a base station device in a wireless LAN, or a base station device in other communication systems. The terminal device 20 can communicate wirelessly with one or more base station devices 10.

[0017] Each base station device 10 can move based on the control from the control device 30. The base station device 10 may be called a mobile base station device. Any means for movement may be used. For example, movement may be realized by mounting the base station device 10 on a drone, the base station device 10 may be made movable on a rail by mounting the base station device 10 on the rail, movement may be realized by mounting the base station device 10 on a vehicle, or movement may be realized by other methods. Here, the "base station device 10" shall also include the movement means (layout control unit). Note that the movement of the base station device 10 may be performed manually.

[0018] Note that among the plurality of base station devices 10 in the target area, there may be a mixture of movable base station devices 10 and fixed base station devices 10. Also, among the plurality of base station devices 10 to be controlled, there may be a mixture of a plurality of different wireless systems (e.g., 5G and wireless LAN).

[0019] The control device 30 may be connected to each base station device 10 wirelessly or by wire. Furthermore, the control device 30 may be installed in, for example, the core network of a mobile network, the internet, or other networks.

[0020] Furthermore, a relay base station device 40 may be provided between the control device 30 and the base station device 10. In this case, communication between the control device 30 and the base station device 10 is performed via the relay base station device 40. Also, if the direction of the antenna of the base station device 10 is variable, the control device 30 can also change the direction of the antenna of the base station device 10.

[0021] Furthermore, the functions of the control device 30 may be provided in the base station device 10, the terminal device 20, or the relay base station device 40. The base station device 10, the terminal device 20, and the relay base station device 40, all equipped with the functions of the control device 30, may also be referred to as "control devices."

[0022] In the example shown in Figure 2, the control device 30 generates the three base station device placement patterns shown in Figure 2 by performing clustering on multiple terminal devices 20 while changing the initial clustering values. The base station device 10 is placed, for example, at the centroid of the cluster.

[0023] The control device 30 calculates the communication request achievement rate for each pattern and selects the pattern with the highest (best) communication request achievement rate. In the example in Figure 2, the communication request achievement rate for pattern 1 is a%, for pattern 2 it is b%, and for pattern 3 it is c%. If a is the highest of a, b, and c, the control device 30 selects pattern 1 from the three patterns and executes control to position (move) each base station device 10 to the location of each base station device 10 in pattern 1.

[0024] Furthermore, when evaluating patterns, it is also possible to consider the link direction, such as uplink and downlink, and the capabilities of each terminal device.

[0025] (Example of system operation) Next, the operation of the control device 30 will be explained according to the steps in the flowchart of Figure 3. In the operation described below, it is assumed that there is an area (referred to as the target area) that the control device 30 is responsible for, and that the terminal devices 20 and base station devices 10 within that target area are the targets of control. Furthermore, there are one or more terminal devices 20 and one or more base station devices 10 within the target area.

[0026] Furthermore, with respect to communication between the base station device 10 and the terminal device 20 in this embodiment, only the downlink may be considered, only the uplink may be considered, or both the downlink and uplink may be considered. For example, "throughput of the terminal device 20" may refer to the downlink throughput of the terminal device 20, the uplink throughput of the terminal device 20, or the total throughput of the downlink throughput and uplink throughput of the terminal device 20.

[0027] Furthermore, the operation examples described below assume that the antenna of the base station device 10 is an omnidirectional antenna. If the antenna of the base station device 10 is a directional antenna (an antenna whose direction can be changed), for example, in the calculation of the evaluation index value (e.g., communication request completion rate) below, it is sufficient to calculate the evaluation index value when the antenna is pointed in the direction that yields the best evaluation index value.

[0028] Furthermore, the control of the procedures described below may be performed periodically, based on instructions from the system administrator, or at other times.

[0029] <s101> In S101, the control device 30 acquires the location (location information) of each terminal device 20. The location of the terminal device 20 may be acquired by any method. For example, the location may be acquired using a positioning method standardized by 3GPP. The control device 30 also acquires the communication requests (e.g., communication request throughput) of each terminal device 20. The communication requests may also be acquired by any method.

[0030] <s102> In S102, the control device 30 calculates multiple arrangement patterns in which multiple base station devices 10 are placed in the target area.

[0031] Specifically, for example, the control device 30 first performs clustering on multiple terminal devices 20 within the target area, dividing the multiple terminal devices 20 into multiple clusters (terminal clusters). This clustering process is performed multiple times (e.g., a predetermined number of times).

[0032] A base station device 10 is placed at the centroid of each of the multiple clusters generated in each clustering operation. A base station device placement pattern is one in which a base station device 10 is placed in each of the multiple clusters generated in a single clustering operation. As an example of an placement image, Figure 4 shows one base station device placement pattern, and Figure 5 shows another base station device placement pattern.

[0033] Any clustering method can be used, but for example, k-means clustering, hierarchical clustering, etc., can be used.

[0034] As an example, the control device 30 performs clustering using the k-means method on multiple terminal devices 20 within the target area by randomly changing the clustering initial value. Specifically, for example, it sets a clustering initial value equal to the number of base station devices 10 in the target area (let's call it M), and divides the multiple terminal devices 20 into M clusters. This clustering process is performed multiple times, with the clustering initial value randomly changed each time.

[0035] In the example above, multiple base station equipment placement patterns are generated by performing clustering a predetermined number of times using different initial values. However, the method for generating base station equipment placement patterns is not limited to this method.

[0036] For example, a pre-prepared arrangement of base station equipment 10 may be used as a base station equipment arrangement pattern, or a random arrangement of base station equipment 10 may be used as a base station equipment arrangement pattern, or a base station equipment arrangement pattern may be prepared by any other method, or a base station equipment arrangement pattern prepared by any of these methods may be combined with a base station equipment arrangement pattern generated by clustering.

[0037] Furthermore, in the example above, the base station device 10 was placed at the centroid of the terminal cluster, but the method of placing the base station device 10 in the terminal cluster is not limited to this method. For example, a candidate location that satisfies predetermined conditions may be selected from among several candidate locations in the terminal cluster, and the base station device 10 may be placed at the selected location. For example, the base station device 10 may be placed at the location within the terminal cluster area that maximizes the number of terminal devices 20 that can see the base station device 10 in a line of sight.

[0038] <s103> In S103, the control device 30 calculates an evaluation index value (e.g., communication request achievement rate) for each base station equipment placement pattern, selects the base station equipment placement pattern with the best evaluation index value from among multiple base station equipment placement patterns, and determines that pattern as the placement pattern for the base station equipment 10. Details of the process when the communication request achievement rate is used as the evaluation index value will be described later.

[0039] <s104> In S104, the control device 30 controls the movement of each base station device 10 so that each base station device 10 is positioned in the location of each base station device 10 in the arrangement pattern determined in S103. The control device 30 also controls each terminal cluster to connect each terminal device 20 within that terminal cluster to the base station device 10 of that terminal cluster. Any control method can be used here.

[0040] For example, if a terminal device 20 sends a connection request to a control device 30 via a base station device 10, the control device 30 instructs the terminal device 20 to connect to the base station device 10 that the terminal device 20 sent the connection request to. The terminal device 20 then sends the connection request to the base station device 10 instructed by the control device 30.

[0041] (Details of the S103 process) Here, we will explain in detail the processing of S103 by the control device 30 when calculating the communication request achievement rate as an evaluation index value.

[0042] The control device 30 calculates the communication request completion rate according to the following procedure (S1 to S4) and selects an arrangement pattern. Note that in the following procedure, it is assumed that the control device 30 has already collected the communication request throughput of each terminal device 20.

[0043] S1: The control device 30 calculates (estimates) the wireless transmission rate between each terminal device 20 and the base station device 10 to which it will be connected (i.e., the base station device 10 located in the cluster to which the terminal device 20 belongs). The wireless transmission rate can be calculated, for example, from an estimated value of the received power at the terminal device 20. Figure 6 shows an image of how the wireless transmission rate is calculated. Note that "Base station device 10-A", etc. in Figure 6 may be referred to as "Base station device A", etc. in the following explanation.

[0044] S2: The control device 30 calculates the communication resource utilization ratio of the base station device 10 (base station communication resource utilization ratio) for each terminal device 20 connected to the base station device 10 by dividing the communication request throughput by the wireless transmission rate calculated in S1.

[0045] Figure 7 shows a specific example. Figure 7 shows examples of calculations for the base station communication resource utilization ratio for each base station equipment layout pattern, each base station equipment, and each terminal equipment. The control device 30 stores the information shown in Figure 7 in a storage device (such as DB34, which will be described later) as it performs the calculations.

[0046] In the example shown in Figure 7, for example, for terminal device Aa under base station device A in base station device arrangement pattern 1, the wireless transmission rate is 100 Mbps and the communication request throughput is 20 Mbps, so the base station communication resource utilization ratio is calculated as 0.2.

[0047] S3: The control device 30 accommodates terminal devices 20 in the base station device 10 in order from those with the lowest base station communication resource utilization ratio, and terminates the terminal accommodation process for the base station device 10 when the sum of the base station communication resource utilization ratios of the accommodated terminal devices 20 exceeds 1.

[0048] For example, with respect to the terminal devices under base station device A in base station device arrangement pattern 1 shown in Figure 7, the control device 30 accommodates terminal devices Ab and Aa in that order into base station device 10, and attempts to accommodate terminal device Ac into base station device 10. Since accommodating terminal device Ac would cause the total base station communication resource utilization ratio to exceed 1, the terminal accommodation process is terminated when terminal device Aa is accommodated. At this time, the accommodated terminal devices are terminal devices Ab and Aa, as shown in Figure 7.

[0049] S4: The control device 30 calculates the ratio of the number of terminal devices 20 accommodated to the total number of terminal devices 20 in the target area for each base station equipment arrangement pattern, and defines this as the communication request achievement rate. The control device 30 selects the base station arrangement pattern with the highest communication request achievement rate.

[0050] In the example shown in Figure 7, the communication request achievement rate for base station equipment placement pattern 1 is 90%, and the communication request achievement rate for base station equipment placement pattern 2 is 85%. Assuming these two patterns are all possible patterns, the control device 30 will select base station equipment placement pattern 1.

[0051] In the above example, it was assumed that the communication request throughput of the terminal device 20 could be determined by the control device 30, and the calculation of the communication request completion rate using that value was explained.

[0052] However, even if the control device 30 cannot ascertain the communication request throughput of the terminal device 20, it is still possible to perform placement control. In this case, for example, the control device 30 assumes that the communication request throughput of each terminal device 20 is a constant value and calculates the communication request achievement rate under that assumption. Even when using such assumptions, it is possible to perform placement control that is assumed to be as likely as possible to satisfy the communication request throughput.

[0053] Furthermore, in the above example, terminal devices 20 with the lowest utilization rate of base station communication resources were accommodated into the corresponding base station device 10 in order, but the accommodation method is not limited to this method. For example, a priority order for accommodation could be set among the terminal devices 20, and terminal devices 20 with higher priority could be accommodated first.

[0054] For example, consider terminal devices under base station A in base station device arrangement pattern 1 of Figure 7, where the priority order is terminal device Ac > terminal device Ab > terminal device Aa. In this case, the control device 30 will accommodate terminal device Ac and terminal device Ab in this order into base station device 10, and will attempt to accommodate terminal device Aa into base station device 10. If terminal device Aa is accommodated, the total base station communication resource utilization ratio will exceed 1, so the terminal accommodation process is terminated when terminal device Ab is accommodated. At this point, the accommodated terminal devices are terminal device Ab and terminal device Ac.

[0055] (Other examples) Using the communication request completion rate as an evaluation metric for selecting base station equipment placement patterns is one example. Other evaluation metrics may also be used.

[0056] For example, evaluation metrics used to select a base station equipment layout pattern may include user satisfaction with communication at the terminal device 20, user quality of experience (QoE) at the terminal device 20, or a combination of multiple evaluation metrics.

[0057] Both the satisfaction level and QoE mentioned above can be estimated, for example, from the estimated communication delay and throughput in the terminal device 20.

[0058] For example, when using QoE as an evaluation metric, the evaluation metric for a given base station equipment deployment pattern may be the average QoE of all target terminal devices 20, or it may be the ratio of the number of terminal devices 20 that satisfy the required QoE (or a predetermined QoE) to the total number of target terminal devices 20.

[0059] Furthermore, as mentioned above, mobile base station devices 10 and fixed base station devices 10 may be mixed within the target area. In this case, the control device 30, for example, excludes terminal devices 20 that will be accommodated by fixed base station devices 10 in advance, and then calculates the arrangement of mobile base station devices 10 for the terminal devices 20 remaining within the target area using the method described above.

[0060] (Example of device configuration) Next, with reference to Figure 8, an example of the device configuration of the equipment constituting the wireless communication system will be described. Figure 8 shows in detail the configuration of equipment particularly involved in connection control. Figure 8 also shows an example in which a relay base station device 40 relays communication between the base station device 10 and the control device 30.

[0061] As shown in Figure 8, the control device 30 includes a communication unit 31, an external input / output unit 32, an arithmetic processing unit 33, a DB (database) 34, an information collection unit 35, a placement calculation unit 36, and a placement control unit 37.

[0062] The communication unit 31 connects to the network and performs information communication. The external input / output unit 32 passes the information received via the communication unit 31 to the arithmetic processing unit 33, and also outputs the information received from the arithmetic processing unit 33 to the outside via the communication unit 31.

[0063] The arithmetic processing unit 33 performs tasks such as storing information in DB34 and reading information from DB34.

[0064] The information gathering unit 35 acquires information from the outside via the communication unit 31 and the external input / output unit 32, etc. For example, the information gathering unit 35 acquires the location and communication requests (including communication request throughput, required satisfaction level, required QoE, etc.) for each terminal device 20. The acquired information is stored in the DB 34 and read out and used by the placement calculation unit 36 ​​and the placement control unit 37.

[0065] As explained in S102 of the flowchart in Figure 3, the placement calculation unit 36 ​​calculates multiple placement patterns for placing multiple base station devices 10 in the target area. The placement results are stored in DB 34 and read out and used by the placement control unit 37.

[0066] As explained in step S103 of the flowchart in Figure 3, the deployment control unit 37 calculates an evaluation index value based on the communication request of each terminal device 20 for each deployment pattern, selects the deployment pattern with the best evaluation index value, and performs deployment control of the base station device 10 based on the selected deployment pattern. During the process of selecting a deployment pattern and performing deployment control, the deployment control unit 37 stores the information from the table in Figure 7 in DB34 and proceeds with calculations by accessing DB34.

[0067] The above-described placement control includes, for example, at least one of the following: movement control, which moves the base station device 10 to the position in the selected placement pattern; and connection control, which connects each terminal device 20 under the moved base station device 10 to the base station device 10. In addition to the movement control, which involves the placement control unit 14 moving the base station device 10, the movement control also includes notifying the administrator (person) of the base station device 10 of the destination location of the base station device 10. In this case, for example, the administrator (person) manually moves the base station device 10.

[0068] The base station device 10 comprises a relay wireless communication unit 11, a terminal wireless communication unit 12, a wireless signal processing unit 13, and a placement control unit 14. The relay wireless communication unit 11 communicates with the control device 30 via the relay wireless station device 40. The terminal wireless communication unit 12 communicates with the terminal device 20 wirelessly. The wireless signal processing unit 14 performs conversion processing between wireless signals and data, etc.

[0069] Furthermore, the wireless signal processing unit 14 receives a connection request from the terminal device 20 and performs control for accommodating the terminal device 20, such as sending a response signal back to the terminal device 20. The wireless signal processing unit 14 also transmits the connection request received from the terminal device 20 to the control device 30 and performs control to return the information of the base station device 10 to the terminal device 20, which is received from the control device 30.

[0070] The placement control unit 14 moves the base station device 10 to the desired position based on instructions from the placement control unit 37 of the control device 30.

[0071] (Example hardware configuration) The terminal device 20, base station device 10, control device 30, and relay base station device 40 can all be implemented, for example, by having a computer run a program. This computer may be a physical computer or a virtual machine on the cloud. Hereinafter, the "terminal device 20, base station device 10, control device 30, and relay base station device 40" will be collectively referred to as "devices".

[0072] In other words, the device can be realized by using hardware resources such as the CPU and memory built into a computer to execute a program corresponding to the processing performed by the device. The program can be recorded on a computer-readable recording medium (such as portable memory), saved, and distributed. It can also be provided via a network, such as the Internet or email.

[0073] Figure 9 shows an example of the hardware configuration of the computer described above. The computer in Figure 9 has a drive device 1000, an auxiliary storage device 1002, a memory device 1003, a CPU 1004, an interface device 1005, a display device 1006, an input device 1007, an output device 1008, etc., all of which are interconnected by a bus BS.

[0074] The program that enables processing on the computer is provided, for example, on a recording medium 1001 such as a CD-ROM or memory card. When the recording medium 1001 containing the program is set in the drive device 1000, the program is installed from the recording medium 1001 to the auxiliary storage device 1002 via the drive device 1000. However, the program does not necessarily have to be installed from the recording medium 1001; it may also be downloaded from another computer via a network. The auxiliary storage device 1002 stores the installed program as well as necessary files and data.

[0075] When a program startup command is received, the memory device 1003 reads the program from the auxiliary storage device 1002 and stores it. The CPU 1004 then implements the functions related to the memory device 1003 according to the program stored in the memory device 1003.

[0076] Interface device 1005 is used as an interface for connecting to a network, etc. Display device 1006 displays a GUI (Graphical User Interface) or the like using a program. Input device 1007 consists of a keyboard and mouse, buttons, or a touch panel, and is used to input various operation instructions. Output device 1008 outputs the calculation results.

[0077] Furthermore, the device may be configured without any one, more, or all of the display device 1006, input device 1007, and output device 1008.

[0078] (Summary of the embodiment, effects) As described above, the technology according to this embodiment makes it possible to easily derive the dynamic arrangement of the base station equipment 10, taking into account the communication requests of each terminal device 20.

[0079] (Note) This specification discloses at least the following wireless communication systems, control devices, deployment control methods, and programs. (Additional note 1) A wireless communication system comprising one or more base station devices that communicate with one or more terminal devices, and a control device, The control device is A configuration calculation unit calculates multiple configuration patterns in which multiple base station devices are placed in the target area, The system includes a deployment control unit that calculates an evaluation index value based on the communication requests of each terminal device for each deployment pattern, selects the deployment pattern that yields the best evaluation index value, and performs deployment control of the base station devices based on the selected deployment pattern. Wireless communication system. (Additional note 2) The aforementioned arrangement calculation unit performs clustering on multiple terminal devices in calculating each arrangement pattern, divides the multiple terminal devices into multiple clusters, and places the base station device at the centroid of each cluster. The wireless communication system described in Appendix 1. (Additional note 3) The placement control unit uses at least one of the following as the evaluation index value: the communication request completion rate, the satisfaction level of the terminal device user, and the QoE (Quality of Experience) of the terminal device user. The wireless communication system described in Appendix 1 or 2. (Additional note 4) A control device in a wireless communication system comprising one or more base station devices that communicate with one or more terminal devices, and a control device, Memory and At least one processor connected to the memory, Includes, The aforementioned processor, We calculate multiple deployment patterns in which multiple base station devices are placed in the target area. For each deployment pattern, an evaluation index value is calculated based on the communication requests of each terminal device. The deployment pattern with the best evaluation index value is selected, and the deployment control of the base station equipment is performed based on the selected deployment pattern. Control device. (Additional note 5) A method for controlling the placement of a wireless communication system comprising one or more base station devices that communicate with one or more terminal devices, and a control device, The control device calculates multiple arrangement patterns in which multiple base station devices are placed in the target area. The control device calculates an evaluation index value based on the communication requests of each terminal device for each deployment pattern, selects the deployment pattern that yields the best evaluation index value, and performs deployment control of the base station devices based on the selected deployment pattern. Arrangement control method. (Additional note 6) A non-temporary storage medium storing a program for causing a computer to function as a component of the control device described in Appendix 4.

[0080] Although this embodiment has been described above, the present invention is not limited to this specific embodiment, and various modifications and changes are possible within the scope of the gist of the invention as described in the claims. [Explanation of Symbols]

[0081] 10 Base station equipment 11. Relay Radio Communication Section 12 Terminal Wireless Communication Unit 13 Wireless signal processing unit 14. Arrangement Control Unit 20 Terminal devices 30 Control device 31 Communications Department 32 External input / output section 33. Arithmetic Processing Unit 34 DB 35. Information Gathering Department 36 Placement calculation section 37 Arrangement Control Unit 40 Relay base station equipment 1000 drive unit 1001 Recording media 1002 Auxiliary storage 1003 Memory device 1004 CPU 1005 Interface device 1006 Display device 1007 Input device 1008 Output device

Claims

1. A wireless communication system comprising one or more base station devices that communicate with one or more terminal devices, and a control device, The control device is A configuration calculation unit calculates multiple configuration patterns in which multiple base station devices are placed in the target area, The system comprises a deployment control unit that calculates a communication request achievement rate as an evaluation index value based on the communication requests of each terminal device for each deployment pattern, selects the deployment pattern that yields the best communication request achievement rate, and performs deployment control of base station devices based on the selected deployment pattern. The deployment control unit calculates the base station communication resource utilization ratio for each terminal device by dividing the communication request throughput by the wireless transmission rate, and then calculates the communication request achievement rate using the said base station communication resource utilization ratio. Wireless communication system.

2. The aforementioned arrangement calculation unit performs clustering on multiple terminal devices in calculating each arrangement pattern, divides the multiple terminal devices into multiple clusters, and places the base station device at the centroid of each cluster. The wireless communication system according to claim 1.

3. A control device in a wireless communication system comprising one or more base station devices that communicate with one or more terminal devices, and a control device, A configuration calculation unit calculates multiple configuration patterns in which multiple base station devices are placed in the target area, The system comprises a deployment control unit that calculates a communication request achievement rate as an evaluation index value based on the communication requests of each terminal device for each deployment pattern, selects the deployment pattern that yields the best communication request achievement rate, and performs deployment control of base station devices based on the selected deployment pattern. The deployment control unit calculates the base station communication resource utilization ratio for each terminal device by dividing the communication request throughput by the wireless transmission rate, and then calculates the communication request achievement rate using the said base station communication resource utilization ratio. Control device.

4. A method for controlling the placement of a wireless communication system comprising one or more base station devices that communicate with one or more terminal devices, and a control device, The control device calculates multiple arrangement patterns in which multiple base station devices are placed in the target area. The aforementioned control device calculates a communication request achievement rate as an evaluation index value based on the communication requests of each terminal device for each deployment pattern, selects the deployment pattern that yields the best communication request achievement rate, and performs deployment control of the base station devices based on the selected deployment pattern. The control device calculates the base station communication resource utilization ratio for each terminal device by dividing the communication request throughput by the wireless transmission rate, and then calculates the communication request achievement rate using the said base station communication resource utilization ratio. Arrangement control method.

5. A program for causing a computer to function as a component of the control device described in claim 3.

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