Wireless communication system, communication terminal, wireless communication method, and program

Abstract

This wireless communication system including a communication terminal for performing wireless communication with one or more base stations comprises: an actual-values management unit that registers, in a database, actual values including the wireless quality at the time of a handover at the communication terminal; an HO prediction unit that predicts the occurrence of a handover at the communication terminal; a wireless quality prediction unit that predicts, on the basis of the actual values registered in the database from one or more terminals, the wireless quality of the communication terminal after the handover has occurred; and a traffic control unit that, on the basis of the prediction result from the HO prediction unit and the prediction result from the wireless quality prediction unit, controls the traffic of the wireless communication before the handover occurs.

Description

Wireless communication system, communication terminal, wireless communication method, and program

[0001] The present invention relates to a wireless communication system, a communication terminal, a wireless communication method, and a program.

[0002] In wireless communication systems for mobile terminals, such as 5G (5th Generation) or LTE (Long Term Evolution), there is a limit to the area in which each base station can communicate, so handover (changing the base station with which the terminal communicates) occurs when the terminal moves. For example, a communication control method is known in which the receiver side of a wireless communication system having multiple propagation paths predicts the movement of an obstruction and controls switching of the propagation paths (see, for example, Patent Document 1).

[0003] 3GPP TS 36.300 V18.0.0 (2023-12)

[0004] Japanese Patent Application Laid-Open No. 2020-92386

[0005] When a handover occurs, wireless quality may deteriorate. However, in conventional technologies, if wireless quality deteriorates due to a handover, traffic control (e.g., control to reduce traffic volume) is performed after detecting the deterioration. Therefore, in conventional technologies, there is a problem that, for example, when wireless quality deteriorates immediately after a handover, excessive traffic volume may cause delays in data communication.

[0006] The embodiments of the present invention have been made in view of the above-mentioned problems, and suppress the occurrence of delays due to excessive traffic volume when a handover occurs in a wireless communication system.

[0007] In order to solve the above problems, a wireless communication system according to an embodiment of the present invention is a wireless communication system including a communication terminal that performs wireless communication with one or more base stations, and includes: an actual value management unit that registers actual values ​​including wireless quality at the time of handover of the communication terminal in a database; an HO prediction unit that predicts the occurrence of handover in the communication terminal; a wireless quality prediction unit that predicts the wireless quality of the communication terminal after the handover occurs based on the actual values ​​registered in the database from one or more terminals; and a traffic control unit that controls traffic of the wireless communication before the handover occurs based on the prediction result by the HO prediction unit and the prediction result by the wireless quality prediction unit.

[0008] According to an embodiment of the present invention, when a handover occurs in a wireless communication system, it is possible to suppress the occurrence of delays due to excessive traffic volume.

[0009] FIG. 1 is a diagram illustrating an example of a system configuration of a wireless communication system according to the present embodiment; FIG. 2 is a diagram illustrating an example of a functional configuration of a wireless communication system according to the present embodiment; FIG. 3 is a flowchart illustrating an example of a performance value registration process according to the present embodiment; FIG. 4 is a flowchart illustrating an example of a traffic control process according to the present embodiment; FIG. 5 is a diagram (1) illustrating an example of traffic control according to a first method; FIG. 6 is a diagram (2) illustrating an example of traffic control according to the first method; FIG. 7 is a diagram (1) illustrating an example of traffic control according to a second method; and FIG. 8 is a diagram illustrating an example of traffic control according to the second method.

[0010] Hereinafter, an embodiment of the present invention will be described with reference to the drawings. The embodiment described below is merely an example, and the embodiment to which the present invention is applied is not limited to the following embodiment.

[0011] <System Configuration> Fig. 1 is a diagram showing an example of the system configuration of a wireless communication system according to this embodiment. The wireless communication system 1 is, for example, a mobile communication system such as 5G (5th Generation) and / or LTE (Long Term Evolution). Note that the wireless communication system 1 may also be another mobile communication system conforming to standards other than 5G and LTE.

[0012] In the example of Figure 1, the wireless communication system 1 includes one or more base stations 10a, 10b, ..., a communication terminal 20 that performs wireless communication with the one or more base stations 10a, 10b, ..., and a management server 30 that can communicate with the communication terminal 20.

[0013] In the following description, the term "base station 10" will be used to refer to any one of the one or more base stations 10a, 10b, .... The number of base stations 10 and the number of communication terminals 20 shown in FIG. 1 are examples. The number of base stations 10 and the number of communication terminals 20 may be two or more.

[0014] The communication terminal 20 is, for example, an information terminal such as a smartphone or a tablet terminal. However, the communication terminal 20 is not limited to this, and may be, for example, various devices capable of wireless communication with the base station 10, such as various vehicles, mobility scooters, robots, or drones. The management server 30 is, for example, a server device capable of communicating with the communication terminal 20, or a virtual server on the cloud.

[0015] (Regarding the Issues) In mobile communication systems such as 5G or LTE, there is a limit to the area in which each base station can communicate, so handover (changing the base station with which the terminal communicates) occurs when the terminal moves. For example, in Fig. 1, when a communication terminal 20 moves from a communication area 11a of a base station 10a to a communication area 11b of a base station 10b, the communication terminal 20 performs handover from the base station 10a to the base station 10b.

[0016] When this handover occurs, wireless quality may deteriorate. However, in conventional technologies, if wireless quality deteriorates due to handover, traffic control (e.g., control to reduce traffic volume) is performed after detecting the deterioration. Therefore, in conventional technologies, there is a problem that, for example, when wireless quality deteriorates immediately after handover, excessive traffic volume may cause delays in data communication.

[0017] For example, in wireless communications where real-time transmission is important, such as remote control of terminals or remote control of autonomous vehicles, if the wireless quality deteriorates immediately after handover, delays may occur when transmitting large amounts of traffic data.

[0018] Therefore, the wireless communication system 1 according to this embodiment has, for example, the functional configurations shown in FIG. 2 in order to suppress delays caused by excessive traffic when a handover occurs.

[0019] <Functional Configuration> Fig. 2 is a diagram showing an example of the functional configuration of the wireless communication system according to this embodiment. The wireless communication system 1 realizes, for example, each functional configuration shown in Fig. 2 by executing a predetermined program on one or more computers included in the wireless communication system 1. In the example of Fig. 3, the wireless communication system 1 has each functional configuration such as a wireless communication unit 201, a performance value management unit 202, a handover prediction unit 203, a wireless quality prediction unit 204, a traffic control unit 205, a location information acquisition unit 206, and a performance value DB (Database) 31. Note that at least a part of each of the above functional configurations may be realized by hardware.

[0020] As a specific example of implementation, the wireless communication unit 201, the performance value management unit 202, the handover prediction unit 203, the wireless quality prediction unit 204, the traffic control unit 205, and the location information acquisition unit 206 are provided, for example, in the communication terminal 20 of FIG. 1 . The performance value DB 31 is provided, for example, in the management server 30 of FIG. 2 . However, this is just one example, and the wireless communication system 1 according to this embodiment can have various configurations. For example, the wireless quality prediction unit 204 and / or the traffic control unit 205 may be provided in the management server 30. The performance value DB 31 may be provided in the communication terminal 20.

[0021] The wireless communication unit 201 transmits and receives radio waves via the antenna 200 and executes wireless communication processing to perform wireless communication with one or more base stations 10 .

[0022] The performance value management unit 202 registers performance values ​​including the wireless quality when the communication terminal 20 performs handover (hereinafter referred to as HO) and location information indicating the location of the communication terminal 20 in the performance value DB 31. The performance value DB 31 is an example of a database according to this embodiment. The performance value management unit 202 also acquires past performance values ​​registered in the performance value DB 31 by one or more communication terminals 20, and provides them to the HO prediction unit 203, the wireless quality prediction unit 204, etc.

[0023] The HO prediction unit 203 executes HO prediction processing to predict the occurrence of HO (handover) in the communication terminal 20. For example, the HO prediction unit 203 predicts whether HO will occur, and if HO will occur, predicts the base station 10 or the like that will be the HO destination. Note that in this embodiment, the HO prediction method used by the HO prediction unit 203 may be any method.

[0024] As an example, the HO prediction unit 203 may obtain the RSRP (Reference Signal Received Power) of the base station 10 with which the communication is being performed and of an adjacent base station from the wireless communication unit 201, and if the RSRP value from the adjacent base station is larger, predict that the HO will be performed to that adjacent base station.

[0025] As another example, the handover prediction unit 203 may predict that a handover will occur at a point where a handover has occurred in the past and is registered in the performance value DB 31. For example, if there is a performance value of handover from base station A to base station B at point X, the handover prediction unit 203 may predict that the communication terminal 20 in communication with base station A will handover to base station B near point X.

[0026] As another example, the HO prediction unit 203 may predict the occurrence of HO from past HO positions, the radio quality of the communication terminal 20, and location information of the communication terminal 20. For example, the HO prediction unit 203 may predict the occurrence of HO using a machine learning model that has been trained in advance to predict the occurrence of HO, with the radio quality of the communication terminal 20 and the location information of the communication terminal 20 as input data and the past HO positions as correct answer data.

[0027] The wireless quality prediction unit 204 executes a wireless quality prediction process for predicting the wireless quality of the communication terminal 20 after a handover occurs, based on the actual values ​​registered in the actual value DB 31 from one or more terminals. Note that in this embodiment, the method for predicting the wireless quality by the wireless quality prediction unit 204 may be any method.

[0028] As an example, the wireless quality prediction unit 204 may obtain the actual value of the throughput after HO or the amount of change in throughput before and after HO from the actual value DB 31, and use the worst actual value as the predicted value of the wireless quality of the communication terminal 20 after HO occurs. This method is suitable when using an application (hereinafter referred to as an app) that requires stable communication.

[0029] As another example, the wireless quality prediction unit 204 may obtain, from the actual value DB 31, the actual values ​​of the throughput after HO or the amount of change in throughput before and after HO, and use the average of the actual values ​​as the predicted value of the wireless quality of the communication terminal 20 after HO has occurred. This method is suitable when using a normal application.

[0030] As another example, the wireless quality prediction unit 204 may obtain the actual values ​​of the throughput after HO or the amount of change in throughput before and after HO from the actual value DB 31, and predict the wireless quality from percentile values ​​(quantiles) of the actual values. For example, the wireless quality prediction unit 204 creates a graph showing the percentage of the CDF (cumulative distribution function) of the amount of change in throughput from the actual values ​​registered in the actual value DB 31. Furthermore, the wireless quality prediction unit 204 may predict the amount of change in throughput corresponding to a preset CDF percentage as the wireless quality before and after HO.

[0031] Alternatively, the wireless quality predicting unit 204 creates a graph of the number of actual throughput values ​​immediately after HO from the actual values ​​registered in the actual value DB 31. Furthermore, the wireless quality predicting unit 204 may use, for example, a throughput value corresponding to a preset percentile value as the predicted value of the throughput immediately after HO. Note that the amount of change in throughput before and after HO and the throughput value immediately after HO are examples of the wireless quality of the communication terminal 20 after handover has occurred.

[0032] The traffic control unit 205 executes traffic control processing to control wireless communication traffic before HO occurs, based on the prediction result by the HO prediction unit 203 and the prediction result by the wireless quality prediction unit 204. For example, if a decrease in wireless quality is predicted after HO predicted by the HO prediction unit 203 occurs, the traffic control unit 205 reduces the amount of wireless communication traffic so as to prevent delays in data communication due to excessive traffic. Note that a specific example of a traffic control method performed by the traffic control unit 205 will be described later.

[0033] The location information acquisition unit 206 executes a location information acquisition process to acquire location information indicating the location of the communication terminal 20. For example, the location information acquisition unit 206 acquires the location information of the communication terminal 20 using a GNSS (Global Navigation Satellite System) receiver or the like provided in the communication terminal 20. Note that the location information acquired by the location information acquisition unit 206 is also usable by the performance value management unit 202, the HO prediction unit 203, the wireless quality prediction unit 204, the traffic control unit 205, and the like.

[0034] <Processing Flow> Next, the processing flow of the wireless communication method according to this embodiment will be described.

[0035] (Actual value registration process) Fig. 3 is a flowchart showing an example of the actual value registration process according to this embodiment. This process shows an example of the actual value registration process executed when, for example, a communication terminal 20 having the functional configuration described in Fig. 2 is performing wireless communication with one or more base stations 10.

[0036] In step S301, the wireless communication unit 201 receives radio waves from one or more base stations 10 (for example, the base station 10 in wireless communication and surrounding base stations 10).

[0037] In step S302, based on the received radio waves, the wireless communication unit 201 acquires the wireless quality of each base station 10. The wireless quality acquired by the wireless communication unit 201 includes, for example, the RSRP of the base station 10 currently communicating and the surrounding base stations, and the value of the throughput of wireless communication with the base station 10 currently communicating.

[0038] In step S303, the wireless communication unit 201 determines whether or not a handover has occurred. If a handover has occurred, the wireless communication unit 201 proceeds to step S304. On the other hand, if a handover has not occurred, the communication terminal 20 ends the process of FIG. 3.

[0039] In step S304, the performance value management unit 202 registers performance values ​​including the wireless quality acquired by the wireless communication unit 201 and the location information acquired by the location information acquisition unit 206 in the performance value DB 31. Note that the wireless quality acquired by the wireless communication unit 201 includes, for example, the RSRP of each base station 10 before and after handover, and the throughput value of the base station 10 during wireless communication before and after handover.

[0040] 3 during wireless communication, the communication terminal 20 included in the wireless communication system 1 repeatedly executes the process of Fig. 3. As a result, the performance value DB 31 accumulates performance values ​​registered by one or more communication terminals 20.

[0041] (Traffic Control Processing) Fig. 4 is a flowchart showing an example of traffic control processing according to this embodiment. Here, the following description will be given assuming that the communication terminal 20 includes the wireless communication unit 201, the performance value management unit 202, the handover prediction unit 203, the wireless quality prediction unit 204, the traffic control unit 205, and the location information acquisition unit 206 shown in Fig. 2 .

[0042] The process of FIG. 4 is an example of traffic control process that is executed when the communication terminal 20 is performing wireless communication with the base station 10 .

[0043] In step S401, the HO prediction unit 203 predicts the occurrence of HO in the communication terminal 20. For example, the HO prediction unit 203 predicts whether HO will occur or not, and if HO will occur, the base station 10 or the like to which HO will be performed, using any of the methods described above.

[0044] In step S402, if the HO prediction unit 203 predicts that HO will occur, the process proceeds to step S403. On the other hand, if the HO prediction unit 203 predicts that HO will not occur, the process in Fig. 4 ends. Alternatively, if the HO prediction unit 203 predicts that HO will not occur, the process may return to step S401.

[0045] In step S403, the wireless quality prediction unit 204 predicts the wireless quality of the communication terminal 20 after HO has occurred, based on the actual value registered in the actual value DB 31. For example, the wireless quality prediction unit 204 predicts the wireless quality (e.g., RSRP, throughput, etc.) when HO has occurred, using any of the methods described above.

[0046] In step S404, the traffic control unit 205 controls the wireless communication traffic before the HO predicted by the HO prediction unit 203 occurs, based on the prediction result by the HO prediction unit 203 and the prediction result by the wireless quality prediction unit 204. For example, if a deterioration in wireless quality is predicted after the HO predicted by the HO prediction unit 203 occurs, the traffic control unit 205 reduces the amount of wireless communication traffic so as to prevent delays in data communication due to excessive traffic. Note that the traffic control unit 205 may increase the amount of wireless communication traffic if an improvement in wireless quality is predicted after the HO predicted by the HO prediction unit 203 occurs.

[0047] By the process of FIG. 4, the wireless communication system according to this embodiment can suppress the occurrence of delays due to excessive traffic when a handover occurs.

[0048] <Traffic Control Processing> In this embodiment, for example, the following first and second methods are assumed as the traffic control processing executed by the traffic control unit 205 in step S404 of Fig. 4. However, the traffic control processing by the traffic control unit 205 may use a method different from the first and second methods.

[0049] (First Method) In the first method, the traffic control unit 205 performs traffic control only before and after HO by the communication terminal 20. This method is intended for applications such as video distribution, in which high-definition (high-traffic) video is transmitted and image distortion caused by an incorrect HO timing prediction is acceptable.

[0050] 5A, it is assumed that a communication terminal 20 moves from a communication area 11a of a base station 10a to a communication area 11b of a base station 10b, and that an HO is predicted to occur in a vicinity 501 of a point A. Note that the prediction for point A may be based on actual values ​​of past HOs, a comparison of RSRP values, or machine learning. It is also assumed that a decrease in wireless quality (e.g., throughput) is predicted when an HO occurs at point A.

[0051] In this case, the traffic control unit 205 reduces the traffic volume 511 during a period T from time t1 to time t2 before and after the HO is predicted, as shown in FIG. 5B, and then restores the traffic volume 511 to its original level after the period T has elapsed.

[0052] Note that time t1 in Fig. 5B is, for example, the time before the RSRP value of the base station 10b exceeds the RSRP value of the base station 10a, or the time before the location information of the communication terminal 20 reaches the periphery 501 of point A. Also, time t2 in Fig. 5B is, for example, the time when a predetermined period T has elapsed since time t1.

[0053] In this way, in the first method, the traffic control unit 205 reduces the traffic volume at the time or location where HO is predicted, so that the wireless communication system 1 can suppress delays caused by excessive traffic volume when HO occurs at the time or location where HO is predicted.

[0054] (Second Method) In the second method, the traffic control unit 205 performs traffic control until the communication terminal 20 performs HO. This method is intended for applications that require stable communication to be maintained, such as remote control of an autonomous vehicle.

[0055] 6A, it is assumed that a communication terminal 20 moves from a communication area 11a of a base station 10a to a communication area 11b of a base station 10b, and that an HO is predicted to occur in a vicinity 601 of point A. It is also assumed that a decrease in wireless quality (e.g., throughput) is predicted when an HO occurs at point A.

[0056] 6B , the traffic control unit 205 reduces the traffic volume 611 at time t0 before the communication terminal 20 arrives at point A, and maintains this state until HO is performed. Preferably, the traffic control unit 205 restores the traffic volume 611 to its original state after a predetermined time has elapsed, even if HO is not performed.

[0057] As described above, in the second method, the traffic control unit 205 reduces the traffic volume before the time or location where HO is predicted, and maintains this state until HO is performed. Therefore, the wireless communication system 1 can suppress delays caused by excessive traffic volume even when HO is performed after the predicted HO timing. Note that the traffic control unit 205 may set the traffic control start time t0 earlier so as to suppress delays caused by excessive traffic volume even when HO is performed before the predicted HO timing.

[0058] <Hardware Configuration> The communication terminal 20 and management server 30 according to this embodiment have, for example, the hardware configuration of a computer 700 as shown in Fig. 7. Note that the management server 30 may be configured by a plurality of computers 700, or may be realized by a virtual machine on the cloud, etc.

[0059] Fig. 7 is a diagram showing an example of the hardware configuration of a computer. In the example of Fig. 7, the computer 700 includes a processor 1001, a memory 1002, a storage device 1003, a communication I / F 1004, an input device 1005, an output device 1006, and a bus B. In addition, when acquiring position information, the computer 700 may further include a GNSS receiver or the like.

[0060] The processor 1001 is, for example, an arithmetic unit such as a CPU (Central Processing Unit) that realizes various functions by executing a predetermined program. The memory 1002 is a storage medium readable by the computer 700, and includes, for example, a RAM (Random Access Memory) and a ROM (Read Only Memory). The storage device 1003 is a large-capacity storage medium readable by the computer, and may include, for example, a HDD (Hard Disk Drive), an SSD (Solid State Drive), various optical disks, and a magneto-optical disk.

[0061] The communication I / F 1004 is an interface for communicating with other devices via a wireless or wired network. The input device 1005 is an input device that accepts input from the outside and may include, for example, a keyboard, a mouse, a microphone, a switch, a button, a sensor, etc. The output device 1006 is an output device that outputs to the outside and may include, for example, a display, a speaker, an LED lamp, etc.

[0062] The bus B is commonly connected to the above components and transmits, for example, address signals, data signals, and various control signals. The processor 1001 may be, in addition to (or instead of) a CPU, a digital signal processor (DSP), a programmable logic device (PLD), a field programmable gate array (FPGA), or the like.

[0063] The program executed by the computer 700 may be for realizing some of the functions described above, or may be capable of realizing the functions described above in combination with a program already stored in the computer 700. Furthermore, some or all of the functional configuration of each device may be realized using hardware such as a PLD or FPGA.

[0064] (Supplementary Note) The communication terminal 20 and management server 30 in this embodiment may be realized not only by dedicated devices but also by general-purpose computers. In this case, a program for realizing this function may be recorded on a computer-readable recording medium, and the program recorded on this recording medium may be read into a computer system and executed. Note that the term "computer system" here includes hardware such as an OS and peripheral devices.

[0065] Furthermore, the term "computer-readable recording medium" includes various storage devices such as portable media such as flexible disks, optical magnetic disks, ROMs, and CD-ROMs, as well as storage devices 2103 built into computer systems. Furthermore, the term "computer-readable recording medium" may also include devices that dynamically store a program for a short period of time, such as a communication line when transmitting a program via a network such as the Internet or a communication line such as a telephone line, and devices that store a program for a certain period of time, such as volatile memory within a computer system that serves as a server or client in such cases.

[0066] Furthermore, the above program may be one that realizes part of the above-mentioned functions, or may be one that can realize the above-mentioned functions in combination with a program already recorded in a computer system, or may be one that is realized using hardware such as a PLD or FPGA.

[0067] <Effects of the embodiment> According to the present embodiment, it is possible to suppress the occurrence of delays due to excessive traffic volume when a handover occurs in the wireless communication system 1. Specifically, the wireless communication system 1 (and the communication terminal 20) according to the present embodiment can avoid delays due to wireless quality degradation and achieve low delays by predicting in advance HO, which is likely to cause degradation in wireless quality, and controlling the traffic volume.

[0068] Summary of Embodiments This specification discloses at least the wireless communication system, communication terminal, wireless communication method, and program of the following paragraphs: (Paragraph 1) A wireless communication system including a communication terminal that performs wireless communication with one or more base stations, comprising: a performance value management unit that registers performance values ​​including wireless quality at the time of handover of the communication terminal in a database, a handover prediction unit that predicts the occurrence of handover in the communication terminal, a wireless quality prediction unit that predicts the wireless quality of the communication terminal after the handover occurs based on the performance values ​​registered in the database from one or more terminals, and a traffic control unit that controls traffic of the wireless communication before the handover occurs based on the prediction result by the handover prediction unit and the prediction result by the wireless quality prediction unit. (Clause 2) A communication terminal that performs wireless communication with one or more base stations, comprising: an actual value management unit that registers actual values ​​including wireless quality at the time of handover of the communication terminal in a database; an HO prediction unit that predicts the occurrence of handover in the communication terminal; a wireless quality prediction unit that predicts the wireless quality of the communication terminal after the handover occurs based on the actual values ​​registered in the database from one or more terminals; and a traffic control unit that controls traffic of the wireless communication before the handover occurs based on the prediction result by the HO prediction unit and the prediction result by the wireless quality prediction unit. (Clause 3) A wireless communication method in a wireless communication system including a communication terminal that performs wireless communication with one or more base stations, comprising: a step in which an actual value management unit registers actual values ​​including wireless quality at the time of handover of the communication terminal in a database; a step in which a handover prediction unit predicts the occurrence of handover in the communication terminal; a step in which a wireless quality prediction unit predicts the wireless quality of the communication terminal after the handover occurs based on the actual values ​​registered in the database from one or more terminals; and a step in which a traffic control unit controls traffic of the wireless communication before the handover occurs based on the prediction result by the HO prediction unit and the prediction result by the wireless quality prediction unit.(4) A program or a storage medium storing the program that causes a computer to function as each unit in the communication terminal according to claim 2.

[0069] Although the present embodiment has been described above, the present invention is not limited to such a specific embodiment, and various modifications and changes are possible within the scope of the gist of the present invention described in the claims.

[0070] REFERENCE SIGNS LIST 1 wireless communication system 10, 10a, 10b base station 20 communication terminal 30 management server 31 performance value DB (database) 201 wireless communication unit 202 performance value management unit 203 handover prediction unit 204 wireless quality prediction unit 205 traffic control unit 206 location information acquisition unit 700 computer

Claims

1. A wireless communication system including a communication terminal that performs wireless communication with one or more base stations, comprising: a performance value management unit that registers performance values ​​including wireless quality at the time of handover of the communication terminal in a database; a handover prediction unit that predicts the occurrence of handover in the communication terminal; a wireless quality prediction unit that predicts the wireless quality of the communication terminal after the handover occurs based on the performance values ​​registered in the database from one or more terminals; and a traffic control unit that controls the wireless communication traffic before the handover occurs based on the prediction results by the handover prediction unit and the prediction results by the wireless quality prediction unit.

2. A communications terminal that performs wireless communication with one or more base stations, comprising: a performance value management unit that registers performance values ​​including wireless quality at the time of handover of the communications terminal in a database; a handover prediction unit that predicts the occurrence of handover in the communications terminal; a wireless quality prediction unit that predicts the wireless quality of the communications terminal after the handover occurs based on the performance values ​​registered in the database from one or more terminals; and a traffic control unit that controls traffic of the wireless communication before the handover occurs based on the prediction results by the handover prediction unit and the prediction results by the wireless quality prediction unit.

3. A wireless communication method in a wireless communication system including a communication terminal that performs wireless communication with one or more base stations, comprising: a step in which an actual value management unit registers actual values ​​including wireless quality at the time of handover of the communication terminal in a database; a step in which a handover prediction unit predicts the occurrence of handover in the communication terminal; a step in which a wireless quality prediction unit predicts the wireless quality of the communication terminal after the handover occurs based on the actual values ​​registered in the database from one or more terminals; and a step in which a traffic control unit controls traffic of the wireless communication before the handover occurs based on the prediction result by the handover prediction unit and the prediction result by the wireless quality prediction unit.

4. A program that causes a computer to function as each unit in the communication terminal according to claim 2.

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