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

Abstract

This wireless communication system comprises a base station and a communication terminal that performs wireless communication with the base station, the wireless communication system comprising: a correction value determination unit that compares a measured value of the wireless quality of the wireless communication with the base station at a first location with an actual value of the wireless quality of the wireless communication with the base station at the first location, and determines a correction value corresponding to the communication terminal; an actual value management unit that corrects, with the correction value, the measured value of the wireless quality of the wireless communication, and registers, to a database, the corrected value as an actual value of the wireless quality of the wireless communication with the base station at the first location; and a wireless quality prediction unit that predicts the wireless quality of the wireless communication with the base station at a second location by using the correction value and the actual value of the wireless quality of the wireless communication with the base station at the second location, and outputs the predicted result.

Description

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

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

[0002] In a wireless communication system for mobile terminals such as LTE (Long Term Evolution) or 5G (5th Generation), there is a technology for predicting the wireless quality at the destination of the mobile terminal. For example, a technology is known in which a database is constructed based on data acquired by various terminals, and a prediction result of wireless quality is output based on the information in the database (see, for example, Patent Document 1).

[0003] ITU-R, Report ITU-R M2135-1, "Guidelines for evaluation of radio interface technologies for IMT-advanced.", 3GPP TS 36.101 V18.4.0 (2023-12).

[0004] Japanese Unexamined Patent Application Publication No. 2020-71042

[0005] In the technology disclosed in Non-Patent Document 1, since a database is constructed based on data acquired by various communication terminals, differences in the device performance or measurement status of each communication terminal are also included, which becomes a factor of error in calculating the predicted value. In addition, an error may occur due to the difference between the measured communication terminal and the communication terminal to be predicted.

[0006] An embodiment of the present invention has been made in view of the above problems, and even when the communication terminal for measuring the wireless quality and the communication terminal for predicting the wireless quality are different, it reduces the deterioration of the prediction accuracy of the wireless quality due to the performance difference of the communication terminals.

[0007] To solve the above problems, a wireless communication system according to an embodiment of the present invention is a wireless communication system including a base station and a communication terminal that performs wireless communication with the base station, comprising: a correction value determination unit that compares a measured value of the wireless quality of the wireless communication with the base station at a first location with an actual value of the wireless quality of the wireless communication with the base station at the first location and determines a correction value corresponding to the communication terminal; an actual value management unit that corrects the measured value of the wireless quality of the wireless communication with the base station at the first location with the correction value and registers it in a database as an actual value of the wireless quality of the wireless communication with the base station at the first location; and a wireless quality prediction unit that uses the actual value of the wireless quality of the wireless communication with the base station at a second location and the correction value to predict the wireless quality of the wireless communication with the base station at a second location and outputs a prediction result.

[0008] According to embodiments of the present invention, even when the communication terminal used to measure wireless quality and the communication terminal used to predict wireless quality are different, it is possible to reduce the deterioration of the prediction accuracy of wireless quality due to differences in the performance of the communication terminals.

[0009] This figure shows an example of the system configuration of the wireless communication system according to this embodiment. This figure shows an example of the functional configuration of the communication terminal according to this embodiment. This flowchart shows an example of the correction value determination process according to this embodiment. This flowchart shows an example of the wireless quality prediction process according to this embodiment. This is Figure (1) for illustrating an example of the correction value determination method according to this embodiment. This is Figure (2) for illustrating an example of the correction value determination method according to this embodiment. This is Figure (1) for illustrating an example of the calculation target of the correction value according to this embodiment. This is Figure (2) for illustrating an example of the calculation target of the correction value according to this embodiment. This is Figure (3) for illustrating an example of the calculation target of the correction value according to this embodiment. This is Figure (1) for illustrating an example of the wireless quality prediction process according to this embodiment. This is Figure (2) for illustrating an example of the wireless quality prediction process according to this embodiment. This is Figure (3) for illustrating an example of the wireless quality prediction process according to this embodiment. This figure shows an example of the computer hardware configuration.

[0010] Hereinafter, embodiments of the present invention (this embodiment) 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 embodiments described below.

[0011] <System Configuration> Figure 1 shows an example of the system configuration of the wireless communication system in this embodiment. The wireless communication system 1 is, for example, a mobile communication system such as LTE (Long Term Evolution) or 5G (5th Generation).

[0012] In the example shown in Figure 1, the wireless communication system 1 includes a base station 10, a communication terminal 20 that communicates wirelessly with the base station 10, and a real-time data database 30 accessible from the communication terminal 20. The number of base stations 10 and the number of communication terminals 20 may be one or more other numbers.

[0013] (Regarding the problem) In mobile communication systems such as 5G or LTE, fluctuations in wireless quality occur due to the movement of the terminal. Various methods have been proposed to predict wireless quality at the destination in order to enable stable use of applications by predicting wireless quality and controlling based on the prediction results. In the conventional technology disclosed in Non-Patent Document 1, a database is constructed based on data acquired from various terminals, and predicted values ​​are determined based on the information in the database.

[0014] However, this method builds a database based on data acquired from various devices, which means that differences in the performance of each device or measurement conditions will be included, becoming a source of error in the calculation of predicted values. In addition, errors may occur due to differences between the device used for measurement and the device being predicted.

[0015] Therefore, the wireless communication system 1 according to this embodiment reduces the deterioration of the accuracy of wireless quality prediction due to performance differences between communication terminals, even when the communication terminal that measures wireless quality and the communication terminal that predicts wireless quality are different. To this end, the communication terminal 20 according to this embodiment has, for example, the functional configurations shown in Figure 2.

[0016] <Functional Configuration> Figure 2 shows an example of the functional configuration of a communication terminal according to this embodiment. As shown in Figure 2, the communication terminal 20 has various functional configurations such as a wireless communication unit 201, a correction value determination unit 202, a performance value management unit 203, a wireless quality prediction unit 204, and a location information acquisition unit 205. Each of these functional configurations is realized, for example, by a program executed by a computer equipped in the communication terminal 20.

[0017] Furthermore, at least some of the above functional configurations may be implemented by hardware. Also, the communication terminal 20 is not limited to information terminals such as smartphones and tablet terminals, but may be various devices capable of wireless communication with the base station 10, such as vehicles, mobility scooters, robots, or drones.

[0018] The wireless communication unit 201 transmits and receives radio waves via the antenna 200 and performs wireless communication processing to send and receive data wirelessly with the base station 10. The wireless communication unit 201 also measures the wireless quality of the wireless communication with the base station 10.

[0019] The correction value determination unit 202 compares the measured value of the wireless quality of the wireless communication with the base station 10 at the first location with the actual value of the wireless quality of the wireless communication with the base station 10 at the first location and performs a correction value determination process to determine a correction value corresponding to the communication terminal 20. For example, the correction value determination unit 202 compares the measured value and the actual value of the wireless quality at the same location from the same base station 10 with the same Cell ID or PCI (Physical Cell ID) and calculates a correction value to correct the performance difference of the communication terminal 20.

[0020] The performance value management unit 203 corrects the measured value of the wireless quality of the wireless communication measured by the wireless communication unit 201 with a correction value determined by the correction value determination unit 202. Alternatively, the performance value management unit 203 registers the corrected wireless quality of the wireless communication as the actual value of the wireless quality of the wireless communication in the performance value DB (database) 30.

[0021] Here, the actual wireless quality values ​​managed by the actual value management unit 203 include, for example, the wireless quality value, identification information (Cell ID, PCI, etc.) that identifies the base station 10 that performed the wireless communication, and three-dimensional location information indicating the location where the wireless quality was measured. The wireless quality value also includes, but is not limited to, throughput, SINR (Signal to Interference plus Noise Ratio), or reception level.

[0022] Furthermore, the correction value determination unit 202 and the wireless quality prediction unit 204 can obtain actual wireless quality values ​​from the actual value DB 30 via the actual value management unit 203.

[0023] The wireless quality prediction unit 204 uses the local value of the wireless quality of the wireless communication with the base station 10 at the second location and the correction value determined by the correction value determination unit 202 to predict the wireless quality of the wireless communication with the base station 10 at the second location and performs wireless quality prediction processing to output the prediction result. For example, the wireless quality prediction unit 204 predicts the wireless quality at the location where the wireless quality is to be predicted (the second location) from the actual value of the wireless quality of the wireless communication with the base station 10 for which the wireless quality was predicted. The wireless quality prediction unit 204 also outputs the predicted wireless quality result, which is the predicted wireless quality corrected by the correction value, to a predetermined output destination. The wireless quality prediction unit 204 may output the predicted wireless quality result to, for example, the wireless communication unit 201, or to the base station 10, etc., via the wireless communication unit 201.

[0024] The location information acquisition unit 205 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 205 acquires three-dimensional location information indicating the location of the communication terminal 20 using a GNSS (Global Navigation Satellite System) receiver or the like provided by the communication terminal 20. The location information acquired by the location information acquisition unit 205 is made available to a wide range of devices, such as the wireless communication unit 201, the correction value determination unit 202, the actual value management unit 203, and the wireless quality prediction unit 204.

[0025] Note that the functional configuration of the communication terminal 20 shown in Figure 2 is just one example. For example, the functions of the actual value management unit 203 may be distributed among the wireless communication unit 201, the correction value determination unit 202, or the wireless quality prediction unit 204, etc. Also, at least a part of the actual value management unit 203, the correction value determination unit 202, and the wireless quality prediction unit 204 may be provided on a server or the like that can communicate with the communication terminal 20. In short, the actual value management unit 203, the correction value determination unit 202, and the wireless quality prediction unit 204, etc., may be provided by the wireless communication system 1 and may be provided outside the communication terminal 20.

[0026] <Processing Flow> Next, the processing flow of the wireless quality prediction method according to this embodiment will be explained.

[0027] (Process for determining the correction value) Figure 3 is a flowchart showing an example of the process for determining the correction value according to this embodiment. This process shows an example of the process for determining the correction value that is executed when a communication terminal 20 having the functional configuration described in Figure 2 is performing wireless communication with a base station 10.

[0028] In step S301, the wireless communication unit 201 receives radio waves from the base station 10 during wireless communication and measures the wireless quality. Also, in step S302, the location information acquisition unit 205 acquires location information indicating the current location (first location) of the communication terminal 20 in parallel with the processing in step S301.

[0029] In step S303, the correction value determination unit 202 determines a correction value corresponding to the communication terminal 20 from the measured value of the wireless quality of the wireless communication with the base station 10 at the first location and the actual value of the wireless quality of the wireless communication with the base station 10. An example of the method for determining the correction value will be described later.

[0030] In step S304, the performance value management unit 203 corrects the measured value of the wireless quality of the wireless communication with the base station 10 with the determined correction value and registers it in the performance value DB 30 as the actual value of the wireless quality of the wireless communication with the base station 10 at the first location.

[0031] As shown in Figure 3, the wireless communication system 1 can construct the actual value DB 30 by correcting for performance differences among the communication terminals 20, even if there are differences in performance among the communication terminals 20.

[0032] (Wireless Quality Prediction Process) Figure 4 is a flowchart showing an example of wireless quality prediction processing according to this embodiment. This process shows an example of wireless quality prediction processing in which the communication terminal 20 predicts the wireless quality of wireless communication with the base station 10 at the location to be predicted (second location) using the correction value determined in the process of Figure 3 and the actual value DB 30 constructed in the process of Figure 3.

[0033] In step S401, the wireless quality prediction unit 204 acquires actual values ​​of the wireless quality of the wireless communication with the base station 10 at the location to be predicted (second location). For example, the wireless quality prediction unit 204 uses the actual value management unit 203 to acquire the measured values ​​of the wireless quality registered in the actual value DB 30.

[0034] In step S402, the wireless quality prediction unit 204 predicts the wireless quality of the wireless communication with the base station 10 at the location to be predicted, based on the acquired actual wireless quality values ​​of the wireless communication with the base station 10. An example of the wireless quality prediction method will be described later.

[0035] In step S403, the wireless quality prediction unit 204 outputs a wireless quality prediction result that reflects a correction value in the predicted wireless quality.

[0036] As shown in Figure 3, the wireless communication system 1 can correct for performance differences among the communication terminals 20, even if there are differences in performance among the communication terminals 20, and predict and output a predicted value for the wireless quality of wireless communication with the base station 10 at the target location.

[0037] <Method for Determining Correction Values> In this embodiment, the correction value determination unit 202 assumes the following two methods for determining the correction value. However, the correction value determination unit 202 may use a method different from the first and second methods.

[0038] (First Method) In the first method, the correction value determination unit 202 calculates a correction value for correcting the performance of the communication terminal 20, such as antenna gain and / or feeder loss. In this case, it is desirable to use continuous values in consideration of the influence of the antenna pattern.

[0039] For example, as shown in FIG. 5, the correction value determination unit 202 compares the measured value of the radio quality at the same base station 10 and the same position within the communication area 11 of the base station 10 with the actual value of the radio quality, and uses the difference as the correction value. Thereby, the correction value determination unit 202 can determine a correction value for correcting the performance 502 of the communication terminal 20, such as antenna gain and / or feeder loss.

[0040] For example, the actual value management unit 203 subtracts the correction value from the measured value of the radio quality to obtain the actual value of the radio quality registered in the actual value DB 30. Further, the radio quality prediction unit 204 adds the correction value to the predicted radio quality from the actual value of the radio quality registered in the actual value DB 30 to obtain the prediction result of the radio quality.

[0041] (Second Method) In the second method, for example, a correction value for correcting the height at which the communication terminal 20 is installed is calculated. This assumes a difference in the antenna height of the communication terminal 20.

[0042] For example, as shown in FIG. 6, the correction value determination unit 202 acquires the height information of the communication terminal 20 from a positioning signal or the like received from GNSS satellites 601 or the like within the communication area 11 of the base station 10, and uses the difference from the reference height as the correction value. In this case, the correction value can be expressed in the form of alog(h), where h is the antenna height and a is an arbitrary count.

[0043] As a specific example of the correction value, the propagation model of ITU-R Recommendation M.2135 can be applied. For example, h' in the following formula (1) ＵＴ becomes the height of the communication terminal 20.

[0044] Here, PL is Pass Loss (dB), d is the distance (m), h' ＢＳ is the height of the base station 10, and fc is the frequency (GHz).

[0045] In the second method as well, the determined correction value is used not only for correcting the actual value of the radio quality registered in the actual value DB 30 but also for correcting the prediction result of the radio quality.

[0046] Note that the correction value determination unit 202 may calculate the correction value by combining the first method and the second method.

[0047] <Calculation Target of Correction Value> In the present embodiment, the following three methods are assumed as the calculation targets of the correction value by the correction value determination unit 202. However, a method different from the first to third methods may be used as the calculation target of the correction value by the correction value determination unit 202.

[0048] (First Method) In the first method, for example, as shown in FIG. 7, the correction value determination unit 202 calculates (determines) the correction value using only the measurement values acquired at the position immediately before the communication terminal 20 (or the vehicle equipped with the communication terminal 20).

[0049] This method has the advantage of obtaining a large number of measurement samples, but is easily affected by fading.

[0050] (Second Method) In the second method, for example, as shown in FIG. 8, the correction value determination unit 202 calculates (determines) the correction value using the measurement values of the radio quality acquired from a predetermined time before (or a predetermined distance before) to immediately before. For example, the correction value determination unit 202 calculates the correction value using the median of the measurement values of the radio quality acquired from a predetermined time before (or a predetermined distance before) to immediately before. Note that the median may be another representative value such as an average value or a mode value.

[0051] This method has the advantage of reducing the influence of differences due to the antenna pattern and being less affected by fading, but continuous data is required.

[0052] (Third Method) In the third method, for example, as shown in FIG. 9, the correction value determination unit 202 calculates (determines) the correction value using the measurement values of the radio quality acquired at a plurality of positions. Note that the plurality of positions may be selected randomly or according to a predetermined rule.

[0053] This method has the advantage of being less susceptible to fading and not necessarily requiring continuous data, but it does require a large amount of data.

[0054] The correction value determination unit 202 may determine the target of the correction value calculation by, for example, a combination of the first method and the third method, or a combination of the first method and the third method.

[0055] <Method for predicting wireless quality> In this embodiment, the following three methods are assumed as methods for predicting wireless quality by the wireless quality prediction unit 204. However, the method for predicting wireless quality by the wireless quality prediction unit 204 may be different from the first to third methods.

[0056] (First Method) In the first method, the wireless quality prediction unit 204 obtains actual values ​​of the wireless quality of wireless communication with the base station 10 at the location to be predicted from the actual value DB 30, and uses the worst actual value as the predicted value of the wireless quality at the location to be predicted. This method is suitable when using applications (hereinafter referred to as "applications") that require stable communication.

[0057] For example, in a graph 1000, as shown in Figure 10, where the horizontal axis represents throughput and the vertical axis represents the number of actual transactions, suppose the actual throughput values ​​1001 are distributed as shown in Figure 10. In this case, the wireless quality prediction unit 204 uses the worst-case value 1002 of the actual value 1001 as the predicted throughput value.

[0058] Furthermore, the wireless quality prediction unit 204 reflects the correction value determined by the correction value determination unit 202 in the predicted throughput value and outputs the throughput prediction result.

[0059] (Second Method) In the second method, the wireless quality prediction unit 204 obtains actual values ​​of the wireless quality of wireless communication with the base station 10 at the location to be predicted from the actual value DB 30, and uses the average of the actual values ​​as the predicted value of the wireless quality at the location to be predicted. This method is suitable when using a normal application.

[0060] For example, in a graph 1100, as shown in Figure 11, where the horizontal axis represents throughput and the vertical axis represents the number of actual transactions, the actual throughput values ​​1101 are distributed as shown in Figure 11. In this case, the wireless quality prediction unit 204 uses the average value of the actual values ​​1101 as the predicted throughput value.

[0061] Furthermore, the wireless quality prediction unit 204 reflects the correction value determined by the correction value determination unit 202 in the predicted throughput value and outputs the throughput prediction result.

[0062] (Third Method) In the third method, the wireless quality prediction unit 204 obtains actual values ​​of the wireless quality of wireless communication with the base station 10 at the location to be predicted from the actual value DB 30, and predicts the wireless quality value at the location to be predicted from the percentile values ​​(quantiles) of the actual values. This method is also suitable when using a normal application.

[0063] For example, in a graph 1100, as shown in Figure 12, where the horizontal axis represents throughput and the vertical axis represents the number of actual transactions, suppose the actual throughput values ​​1201 are distributed as shown in Figure 12. In this case, the wireless quality prediction unit 204 uses the throughput value corresponding to a preset percentile value (for example, the 20th percentile value) as the throughput prediction value.

[0064] Furthermore, the wireless quality prediction unit 204 reflects the correction value determined by the correction value determination unit 202 in the predicted throughput value and outputs the throughput prediction result.

[0065] Note that throughput is just one example of wireless quality, and other wireless quality levels may also be used.

[0066] <Hardware Configuration> The communication terminal 20 according to this embodiment has, for example, the hardware configuration of the computer 1300 as shown in Figure 13.

[0067] Figure 13 shows an example of a computer hardware configuration. In the example in Figure 13, the computer 1300 includes a processor 1301, memory 1302, storage device 1303, communication interface 1304, input device 1305, output device 1306, GNSS receiver 1307, and bus B, etc.

[0068] The processor 1301 is a computing device such as a CPU (Central Processing Unit) that realizes various functions by executing a predetermined program. The memory 1302 is a storage medium that can be read by the computer 1300, and includes, for example, RAM (Random Access Memory) and ROM (Read Only Memory). The storage device 1303 is a large-capacity storage medium that can be read by the computer, and may include, for example, an HDD (Hard Disk Drive), an SSD (Solid State Drive), various optical discs, and magneto-optical discs.

[0069] The communication interface 1304 is an interface for communicating with other devices via a wireless or wired network. The input device 1305 is an input device that accepts input from the outside and may include, for example, a keyboard, mouse, microphone, switch, button, sensor, etc. The output device 1306 is an output device that performs output to the outside and may include, for example, a display, speaker, LED lamp, etc. The GNSS receiver 1307 is a positioning device that receives positioning signals from GNSS satellites and outputs three-dimensional position information.

[0070] Bus B is connected to all of the above components in common and transmits, for example, address signals, data signals, and various control signals. The processor 1301 may be a DSP (Digital Signal Processor), a PLD (Programmable Logic Device), or an FPGA (Field Programmable Gate Array) in addition to (or instead of) the CPU.

[0071] The program executed by computer 1300 may be for the purpose of realizing some of the functions described above, and may also be for realizing the functions described above in combination with a program already recorded in computer 1300. Furthermore, some or all of the functional configuration of each device may be realized using hardware such as a PLD or FPGA.

[0072] (Supplement) The communication terminal 20 in this embodiment is not limited to being implemented by a dedicated device, but may also be implemented by a general-purpose computer. In that case, the program for implementing this function may be recorded on a computer-readable recording medium, and the program recorded on this recording medium may be loaded into a computer system and executed. The term "computer system" as used herein includes hardware such as an operating system and peripheral devices.

[0073] Furthermore, "computer-readable recording media" includes various storage devices such as flexible disks, magneto-optical disks, ROMs, CD-ROMs, and storage devices 2103 built into computer systems. In addition, "computer-readable recording media" may also include those that dynamically hold programs for a short period of time, such as communication lines used when transmitting programs via networks such as the Internet or communication lines such as telephone lines, and those that hold programs for a certain period of time, such as volatile memory inside computer systems that act as servers or clients in such cases.

[0074] Furthermore, the above program may be for the purpose of realizing some of the functions described above, or it may be able to realize the above functions in combination with a program already recorded in the computer system, or it may be implemented using hardware such as a PLD or FPGA.

[0075] <Effects of the Embodiment> According to this embodiment, even when the communication terminal 20 that measures wireless quality and the communication terminal 20 that predicts wireless quality are different, it is possible to reduce the deterioration of prediction accuracy due to differences in the performance of the communication terminals. For example, in this embodiment, by comparing the measured value and the actual value of wireless quality at the same location from the same base station 10 and calculating a correction value, it is possible to reduce the deterioration of prediction accuracy due to differences in the performance of the communication terminals 20, even when measurement and prediction are performed with different communication terminals 20.

[0076] <Summary of Embodiments> This specification discloses at least the following wireless communication systems, communication terminals, wireless quality prediction methods, and programs. (Section 1) A wireless communication system including a base station and a communication terminal that performs wireless communication with the base station, comprising: a correction value determination unit that compares a measured value of the wireless quality of the wireless communication with the base station at a first location with an actual value of the wireless quality of the wireless communication with the base station at the first location and determines a correction value corresponding to the communication terminal; an actual value management unit that corrects the measured value of the wireless quality of the wireless communication with the base station at the first location with the correction value and registers it in a database as an actual value of the wireless quality of the wireless communication with the base station at the first location; and a wireless quality prediction unit that uses the actual value of the wireless quality of the wireless communication with the base station at a second location and the correction value to predict the wireless quality of the wireless communication with the base station at a second location and outputs a prediction result. (Clause 2) A communication terminal that performs wireless communication with a base station, comprising: a correction value determination unit that compares a measured value of the wireless quality of the wireless communication with the base station at a first location with an actual value of the wireless quality of the wireless communication with the base station at the first location and determines a correction value corresponding to the communication terminal; an actual value management unit that corrects the measured value of the wireless quality of the wireless communication with the base station using the correction value and registers it in a database as an actual value of the wireless quality of the wireless communication; and a wireless quality prediction unit that uses the actual value of the wireless quality of the wireless communication with the base station at a second location and the correction value to predict the wireless quality of the wireless communication with the base station at a second location and outputs a prediction result.(Clause 3) A wireless quality prediction method comprising: a wireless communication system including a base station and a communication terminal that performs wireless communication with the base station, which performs the following processes: comparing a measured value of the wireless quality of the wireless communication with the base station at a first location with an actual value of the wireless quality of the wireless communication with the base station at the first location to determine a correction value corresponding to the communication terminal; correcting the measured value of the wireless quality of the wireless communication with the base station with the correction value and registering it in a database as an actual value of the wireless quality of the wireless communication; and using the actual value of the wireless quality of the wireless communication with the base station at a second location and the correction value to predict the wireless quality of the wireless communication with the base station at a second location and outputting the prediction result. (Clause 4) A program or a storage medium storing a program that causes a computer to perform the wireless quality prediction method according to claim 3.

[0077] 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.

[0078] 1 Wireless communication system 10 Base station 20 Communication terminal 30 Actual value DB (database) 201 Wireless communication unit 202 Correction value determination unit 203 Actual value management unit 204 Wireless quality prediction unit 205 Location information acquisition unit 1300 Computer

Claims

1. A wireless communication system including a base station and a communication terminal that performs wireless communication with the base station, comprising: a correction value determination unit that compares a measured value of the wireless quality of the wireless communication with the base station at a first location with an actual value of the wireless quality of the wireless communication with the base station at the first location and determines a correction value corresponding to the communication terminal; an actual value management unit that corrects the measured value of the wireless quality of the wireless communication with the base station at the first location with the correction value and registers it in a database as an actual value of the wireless quality of the wireless communication with the base station at the first location; and a wireless quality prediction unit that uses the actual value of the wireless quality of the wireless communication with the base station at a second location and the correction value to predict the wireless quality of the wireless communication with the base station at a second location and outputs a prediction result.

2. A communication terminal for wireless communication with a base station, comprising: a correction value determination unit that compares a measured value of the wireless quality of the wireless communication with the base station at a first location with an actual value of the wireless quality of the wireless communication with the base station at the first location to determine a correction value corresponding to the communication terminal; an actual value management unit that corrects the measured value of the wireless quality of the wireless communication with the base station at the first location with the correction value and registers it in a database as an actual value of the wireless quality of the wireless communication with the base station at the first location; and a wireless quality prediction unit that uses the actual value of the wireless quality of the wireless communication with the base station at a second location and the correction value to predict the wireless quality of the wireless communication with the base station at a second location and output the prediction result.

3. A wireless communication system including a base station and a communication terminal that performs wireless communication with the base station, performs the following steps: a process of determining a correction value corresponding to the communication terminal by comparing a measured value of the wireless quality of the wireless communication with the base station at a first location with an actual value of the wireless quality of the wireless communication with the base station at the first location; a process of correcting the measured value of the wireless quality of the wireless communication with the base station at the first location with the correction value and registering it in a database as an actual value of the wireless quality of the wireless communication with the base station at the first location; and a process of predicting the wireless quality of the wireless communication with the base station at a second location using the actual value of the wireless quality of the wireless communication with the base station at a second location and the correction value, and outputting the prediction result.

4. A program that causes a computer to execute the wireless quality prediction method described in claim 3.

Images