JP2015126406A - Radio network evaluation device, method and system, and program - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a method, a device and a system that prevent or reduce increase in a load on and expenses of a network involved in acquisition of surface communication speed in evaluation of a radio network.SOLUTION: An evaluation device comprises: communication speed estimation means for estimating communication speed of a terminal at a spot by using throughput calculated from a signal-to-interference and noise ratio at the spot and the number of simultaneously connected people; and simultaneously connected person number estimation means for estimating the number of simultaneously connected people on the basis of network quality measured in a cell covering the spot.

Description

  The present invention relates to a wireless network evaluation device, system, method and program.

  In recent years, high-speed wireless systems such as LTE (Long Term Evolution) have begun to spread in mobile communications. In order to evaluate cellular network quality, a communication carrier evaluates the communication speed (Throughput) of a terminal in a service providing area. As a technique for calculating the communication speed of the terminal, for example, the following technique is known.

(A) The fixed size data arranged on the server is received by the measurement terminal via the base station, and the measurement time is measured.

(B) A huge amount of data is arranged on the server, and the amount of data received by the terminal within a predetermined time is measured.

  In both methods (a) and (b), for example, the following equation (1) is obtained from the data size (DATA_SIZE) received at the terminal and the connection time (CONNECTED_TIME; for example, the time from reception start to reception end). To calculate the communication speed (TP: Throughput).

・・・(1)

... (1)

  As another known method for calculating the communication speed, for example, as described in Non-Patent Document 1, Non-Patent Document 2, and the like, a packet sequence having a predetermined time interval and data size is transmitted from the server side, There is a method of calculating the communication speed on the terminal side according to the reception status of the packet sequence. In Patent Document 1, since it is considered that the higher the SIR (Signal to Interference Ratio) acquired by the signal quality acquisition unit, the higher the SIR (Signal to Interference Ratio), the maximum communication rate estimation unit is the SIR acquired by the signal quality acquisition unit. A configuration is disclosed in which the maximum communication rate is estimated in accordance with a criterion such that the maximum communication rate increases as the value increases. The maximum communication rate estimation unit estimates the maximum communication rate RMAX using the SIR acquired by the signal quality acquisition unit as an argument by referring to the table by associating and storing the SIR and the maximum communication rate.

  Further, in Patent Document 2, the user throughput estimation means is configured to input the shared channel reception quality (SIR) output from the reception quality estimation means and the traffic information in the estimation target range output from the traffic information reading means. A configuration is disclosed in which the user throughput at the position of each user terminal in the cell is calculated using the above-described user throughput calculation function f, and is output as a user throughput estimation result.

JP2012-009987A Republished Patent No. 2006/074447

V. J. Ribeiro, R. H. Riedi, R. G. Baraniuk, J. Navratil and L. Cottrell, “pathChirp: efficient available bandwidth estimation for network paths,” PAM Workshop, 2003. Ohshiba, Nakajima: Short-term available bandwidth estimation method to ensure the quality of real-time communication, IPSJ Transactions, Vol. 53 No. 2 pp. 698-711, 2012. 3GPP TS 25.214 v11.6.0 (2013-6) 3GPP TS 36.123 v11.3.0 (2013-6)

  The analysis of related technology is given below.

  The communication speed at a terminal depends on the wireless quality at the location where the terminal communicates, the usage status when measuring the communication speed, etc., in a cell managed by the base station. For this reason, in order to compare the communication speed characteristics of terminals at different points in a cell of the same base station, a plurality of measurement terminals are prepared, and the above-described method is used at the same time at the points. It is necessary to measure the communication speed using.

  However, this work requires a lot of man-hours, costs and time. Also, during the period of measuring the communication speed in the network, the network load increases due to the measurement overhead, such as greatly reducing the bandwidth available for transferring other data. For this reason, there is a possibility that performance degradation of other terminals in the cell area will be caused.

  Furthermore, there is a problem that the network load increases due to the communication speed measurement by a plurality of terminals at a plurality of points in the cell of the same base station, and as a result, the accurate communication speed cannot be measured. is there.

  Therefore, the present invention was created in view of the above-described problems, and its purpose is to suppress an increase in load and cost on the network associated with acquiring a plane communication speed in evaluating a wireless network. A system, a method, an apparatus, and a program may be provided.

  According to one aspect of the disclosed invention, the communication speed of the terminal at the point is estimated using the throughput (maximum transmission rate) calculated from the signal-to-interference noise ratio at the point and the number of simultaneous connections. There is provided a wireless network evaluation device comprising: a communication speed estimation means; and a simultaneous connection number estimation means for estimating the number of simultaneous connections based on network quality measured in a cell covering the point. 1).

  According to another aspect of the disclosed invention, a measurement terminal that measures network quality within a cell that covers the point, a base station that has jurisdiction over the cell, and a viewpoint 1 connected to the base station A wireless network evaluation system provided with such a wireless network evaluation device is provided (viewpoint 2).

According to yet another aspect of the disclosed invention, the number of simultaneous connections is estimated based on network quality measured in a cell that covers a point,
There is provided a wireless network evaluation method for estimating a communication speed of a terminal at the point using a throughput (maximum transmission rate) calculated from a signal-to-interference noise ratio at the point and the simultaneous connection person ( Viewpoint 3).

  According to still another aspect of the disclosed invention, a simultaneous connection number estimation process for estimating a simultaneous connection number based on network quality measured in a cell having a point as a coverage area, and signal-to-interference noise at the point A program for causing a computer to execute a communication speed estimation process for estimating a communication speed of a terminal at the point by using a throughput (maximum transmission rate) calculated from the ratio and the number of simultaneously connected users is provided ( Viewpoint 4). Further, a computer-readable recording medium recording the program according to viewpoint 4 is provided (viewpoint 5).

  According to the present invention, the number of measurement points required for comparative evaluation of communication speeds between a plurality of points is suppressed, and the increase in the load on the network and the increase in costs associated with acquiring a flat communication speed are suppressed. It is possible.

It is a figure which illustrates the structure of the radio | wireless network evaluation system in the 1st exemplary embodiment of this invention. It is a figure which illustrates the structure of the representative point measuring machine 10 in the 1st exemplary embodiment of this invention. It is a figure which illustrates the structure of the evaluation point measuring machine 20 in 1st exemplary embodiment. It is a figure which illustrates the structure of the evaluation apparatus 30 in the 1st exemplary embodiment of this invention. It is a figure which illustrates the output result of the evaluation apparatus in the radio network evaluation system in the 1st exemplary embodiment of the present invention. It is a flowchart for demonstrating an example of operation | movement of the representative point measuring machine 10 in the 1st exemplary embodiment of this invention. It is a flowchart for demonstrating an example of operation | movement of the evaluation point measuring machine 20 in the 1st exemplary embodiment of this invention. It is a flowchart for demonstrating an example of the operation | movement which receives and stores the information of the evaluation apparatus 30 in the 1st exemplary embodiment of this invention. It is a flowchart for demonstrating an example of the operation | movement which estimates the communication speed of the evaluation apparatus 30 in the 1st exemplary embodiment of this invention. It is a flowchart for demonstrating an example of the operation | movement which displays the evaluation result of the evaluation apparatus 30 in the 1st exemplary embodiment of this invention. It is a figure which illustrates the structure of the radio | wireless network evaluation system in the 2nd exemplary embodiment of this invention. It is a figure which illustrates the structure of the evaluation apparatus 31 in the 2nd exemplary embodiment of this invention. It is a flowchart for demonstrating an example of the operation | movement which stores the evaluation point information in the 2nd exemplary embodiment of this invention. It is a flowchart for demonstrating an example of the operation | movement which estimates the radio | wireless load and the simultaneous connection number in the evaluation apparatus 31 in the 2nd exemplary embodiment of this invention. It is a flowchart for demonstrating an example of the operation | movement which estimates the communication speed of the evaluation apparatus 31 in the 2nd exemplary embodiment of this invention. It is a figure which illustrates the output result of the evaluation apparatus in the radio | wireless network evaluation system in the 2nd exemplary embodiment of this invention. It is a figure which illustrates the structure of the radio network evaluation system in the 3rd exemplary embodiment of this invention. It is a figure which illustrates the structure of the representative point measuring machine 12 in the 3rd exemplary embodiment of this invention. It is a figure which illustrates the structure of the evaluation apparatus 32 in the 3rd exemplary embodiment of this invention. It is a flowchart for demonstrating an example of operation | movement of the representative point measuring machine 12 in the 3rd illustrative embodiment of this invention. It is a figure explaining the basic concept of invention.

According to some disclosed embodiments, referring to FIG. 21, the evaluator (30) can determine the network quality (eg, signal-to-interference and noise ratio) measured in a cell that covers a point. Simultaneously connected number estimating means (simultaneously connected number estimating unit) (3041) for estimating the number of simultaneously connected persons (EAN: Effective Active Number) based on wireless load), and signal to interference noise ratio (SINR) at the certain point communication rate (throughput TP) of the terminal at the point using a throughput calculated from plus Noise Ratio (for example, maximum transmission rate: TP _max = f (SINR)) and the number of simultaneous users (EAN). Is provided with communication speed estimation means (3042). The simultaneous connection number estimating means (3041) and the communication speed estimating means (3042) may be configured to execute part or all of the functions by a program executed by a computer constituting the evaluation device (30). In this case, the computer functions as the evaluation device (30) by reading and executing the program stored in the semiconductor memory or the magnetic / optical storage device (not shown) in which the program is recorded into the main memory of the computer. . The simultaneous connection number estimating means (3041) and the communication speed estimating means (3042) may be configured to be distributed in nodes that are connected to communicate with each other, in addition to the configuration implemented in the evaluation device (30).

According to some disclosed embodiments (e.g., Forms 1 and 2), the network quality includes the communication speed (TP1) measured in the cell covering the point, and the cell quality. Includes measured signal-to-interference and noise ratio (SINR). The simultaneous connection number estimating means (3041 in FIGS. 4 and 12) is a correspondence relationship between the signal-to-interference noise ratio and the throughput (TP _max ) (for example, maximum transmission rate TP _max = f (SINR): f is a conversion formula). Based on the above, a throughput (for example, maximum transmission rate TP _max = f (SINR)) corresponding to the signal-to-interference noise ratio (SINR) measured in the cell is derived, and the throughput (for example, maximum transmission rate TP _max = f (SINR)) and the first communication speed (TP1) actually measured in the cell, the number of simultaneously connected persons (EAN) is estimated (for example, EAN = throughput (TP _max ) / communication speed). (TP1)). Note that the conversion formula f may be in any of a relationship table (table) format, a mathematical expression, or the like that represents the relationship between the signal-to-interference noise ratio (SINR) and the throughput (for example, the maximum transmission rate TP _max ) characteristic.

According to one aspect of the embodiment (e.g., Form 3), the network quality is measured in a signal-to-interference and noise ratio (SINR) measured in a cell that covers the point, and in the cell. And a wireless load (Load _d ) calculated based on the wireless quality of the reference signal. According to one aspect of the embodiment (for example, Embodiment 3), the radio load (Load _d ) is calculated from the radio quality (RSRQ) of the reference signal measured in the cell and the signal-to-interference noise ratio (SINR). It is good also as a structure further provided with the radio | wireless load estimation means (wireless load estimation part 3143 of FIG. 12) to estimate. The simultaneous connection number estimating means (simultaneous connection number estimating unit 3041 in FIG. 12) corresponds to the estimated wireless load according to the correspondence relationship between the wireless load (Load _d ) and the simultaneous connection number (EAN). The number of simultaneous connections is estimated. The communication speed estimation means (communication speed estimation unit 3042 in FIG. 12) is based on the number of simultaneous connections (EAN) and the signal-to-interference noise ratio (SINR) at the point, and the communication speed (TP = Estimate f (SINR) / EAN).

  According to one aspect (for example, Embodiment 1) of the embodiment, the signal-to-interference noise ratio measured by a measuring device installed at the point is used as the signal-to-interference noise ratio at the point.

According to one aspect (for example, Embodiment 2) of the embodiment, the signal-to-interference noise ratio (SINR) measured in the cell covering the point and the radio quality of the reference signal measured in advance at the point (RSRQ) wireless load estimation means (radio load estimation unit 3143 in FIG. 12) for calculating a wireless load (Load _i ), a reference signal received power (RSRP) measured in advance at the point, and the wireless Based on the wireless load (Load _i ) calculated by the load estimating means (wireless load estimating unit 33143 in FIG. 12), the signal-to-interference noise ratio (SINR _d ) at the point; for example, see formula (6) described later The signal-to-interference / noise ratio estimation means (signal-to-interference / noise ratio estimation unit 3144 in FIG. 12) may be further included.

According to one aspect (for example, Embodiment 2) of the embodiment, the signal-to-interference noise ratio (SINR) measured in the cell covering the point and the radio quality of the reference signal measured in advance at the point (RSRQ) based on wireless load estimation means (Radio load estimation unit 3143 in FIG. 12) for calculating the wireless load (Load _i ), and the propagation loss calculated according to the positional relationship between the base station (50) and the point Based on the received power of the reference signal (estimated RSRP) estimated based on the estimation result and the wireless load (Load _i ) calculated by the wireless load estimating means (3143 in FIG. 12), the signal pair at the point A signal-to-interference / noise-ratio estimation unit (signal-to-interference / noise ratio estimation unit 3144 in FIG. 12) that calculates an interference / noise ratio (SINRd; see, for example, Equation (6) described later); It may be.

  According to the embodiment, for example, by estimating the number of simultaneously connected persons (EAN) from the actual measurement result at the representative point, the point where only the wireless quality measurement information (reception quality) is obtained (the communication speed is measured). It is possible to grasp the communication speed of the point even for a point that has not been done. As a result, it is possible to acquire the communication speed in the evaluation target cell by suppressing the actual measurement point, the number of times, and the like while suppressing the influence on the network. Several exemplary embodiments will be described below with reference to the drawings.

<First Exemplary Embodiment>
In the first exemplary embodiment of the present invention, a measuring device (terminal) is installed at a representative point for actually measuring the communication speed in the cell, and the measurement result of the radio quality and the communication speed measured at the representative point; Based on the measurement result of the wireless quality at an evaluation point different from the representative point, the communication speed at the evaluation point is estimated.

  FIG. 1 is a diagram schematically illustrating an example of a wireless network evaluation system in the first exemplary embodiment. Referring to FIG. 1, the system includes a representative point measuring device 10, an evaluation point measuring device 20, an evaluation device 30, a network 40, a base station 50, and a cell 501 that the base station 50 has jurisdiction over. . The network 40 may be configured to include a packet data network such as the Internet connected via a mobile network (core network) of a communication carrier or a gateway (for example, PGW (Packet Data Network) Gateway) of the mobile network. .

  The representative point measuring device 10 is installed at a representative point (first point) in the cell (assigned cell) 501 and measures the wireless quality and the communication speed at the location point of the representative point measuring device 10. The measurement result of the representative point measuring device 10 is transferred to the evaluation device 30 via the base station 50 and the network 40.

  The evaluation point measuring machine 20 is installed at an evaluation point (second point) different from the representative point in the cell 501, and measures the wireless quality at the evaluation point. A measurement result obtained by the evaluation point measuring machine 20 is transferred to the evaluation apparatus 30 via the base station 50 and the network 40. In FIG. 1, for simplicity, subscriber terminals in the cell 501 are omitted, and only the representative point measuring device 10 and the evaluation point measuring device 20 are shown.

The evaluation device 30
-Estimate the number of simultaneous connections (for example, the number of users connected simultaneously) based on the wireless quality measurement results sent from the representative point measuring device 10,
The communication speed at the evaluation point is estimated based on the wireless quality measurement result sent from the evaluation point measuring machine 20 and the estimation result of the number of simultaneously connected persons. Details of the estimation of the communication speed will be described later.

  The network 40 is connected to the representative point measuring device 10, the evaluation point measuring device 20, and the base station 50 that constitute the cellular network, and sends information from the representative point measuring device 10 and the evaluation point measuring device 20 to the evaluation device 30. The base station 50 is connected to the network 40 and has a function of communicating with terminals under its control.

  FIG. 2 is a diagram illustrating a specific configuration example of the representative point measuring machine 10 of FIG. Referring to FIG. 2, the representative point measuring machine 10 includes an antenna 101, a wireless communication unit 102, and a measurement unit 103 including a wireless quality measurement unit 1031 and a communication speed measurement unit 1032. The antenna 101 is used for receiving radio waves radiated from the base station 50 and transmitting radio waves from the representative point measuring device 10 to the base station 50. The wireless communication unit 102 communicates with the base station 50 via the antenna 101. Further, the wireless communication unit 102 acquires information necessary for measuring the wireless quality, receives data necessary for measuring the communication speed, and transmits the measurement result to the evaluation device 30 via the base station 50. . Note that the representative point measuring device 10 may be configured to include, for example, a position information acquisition unit (not shown) by a GPS (Global Positioning System) reception function or the like as an option. In this case, for example, the wireless communication unit 102 may transmit the measurement result to the evaluation device 30 via the base station 50 together with the position information of the measurement point.

  The measurement part 103 totals the measurement results of each measurement function. The radio quality measurement unit 1031 determines the radio quality (for example, SINR, RSRQ (Reference Signal Received Quality) in the LTE, RSSI (Received Signal Strength Indicator: received signal) from the signal received by the radio communication unit 102. Strength), RSRP (Reference Signal Received Power) and the like.

  The communication speed measurement unit 1032 calculates the communication speed from the data received by the wireless communication unit 102. The communication speed may be calculated using an equation (for example, the above equation (1)) obtained by dividing the amount of received data by the time difference between the start and end of reception. Further, a communication speed measurement server (not shown) may be installed on the network 40, and the communication speed measurement method disclosed in Non-Patent Document 1, Non-Patent Document 2, or the like may be used.

  The wireless quality measuring unit 1031 and the communication speed measuring unit 1032 log the measurement result in a storage device (not shown) together with the position information of the representative point measuring device 10 at the time of measurement, and the predetermined timing, event occurrence, etc. Thus, the log information may be transmitted to the evaluation device 30 via the base station 50. The representative point measuring machine 10 in FIG. 2 may be configured as a dedicated measuring machine (terminal). Alternatively, a smartphone having a function equivalent to the configuration shown in FIG. 2, that is, a function of measuring wireless quality and reporting a measurement result, and a function of measuring a communication speed and reporting a measurement result such as a communication speed measurement application A terminal (LTE UE (User Equipment)) such as a terminal or a mobile phone terminal may be used as the representative point measuring device 10.

  FIG. 3 is a diagram illustrating a specific configuration of the evaluation point measuring machine 20 of FIG. Referring to FIG. 3, the evaluation point measuring machine 20 includes an antenna 201, a wireless communication unit 202, and a measuring unit 203 including a wireless quality measuring unit 2031. The antenna 201, the wireless communication unit 202, and the wireless quality measuring unit 2031 of the evaluation point measuring device 20 are the same as the antenna 101, the wireless communication unit 102, and the wireless quality measuring unit 1031 of the representative point measuring device 10 described with reference to FIG. Each has the same configuration. Therefore, the description is omitted. The evaluation point measuring machine 20 in FIG. 3 may be configured as a dedicated measuring machine (terminal). Alternatively, a terminal such as a smart phone terminal or a mobile phone terminal having a function equivalent to the configuration shown in FIG. 3, that is, a function of measuring wireless quality and reporting a measurement result may be used as the evaluation point measuring machine 20. .

  FIG. 4 is a diagram illustrating a specific configuration of the evaluation device 30 of FIG. Referring to FIG. 4, the evaluation device 30 includes a receiving unit 301, a search unit 302, a database 303, an estimation unit 304, and an input / output unit 305. The database 303 stores representative point information 3031, evaluation point information 3032, and measurement result information 3033. The estimation unit 304 includes a simultaneous connection number estimation unit 3041 and a communication speed estimation unit 3042. The input / output unit 305 includes an input unit 3051 and a display unit 3052.

  The receiving unit 301 receives information transmitted from the representative point measuring machine 10 and the evaluation point measuring machine 20 via the network 40 and stores the information in the database 303.

  The search unit 302 reads the evaluation point information 3032 stored in the database 303 based on information input from the input unit 3051 of the input / output unit 305, for example, and supplies it to the input / output unit 305.

The representative point information 3031 is transmitted from the representative point measuring device 10 via the network 40, for example.
・ Representative point position information (for example, representative point latitude and longitude information),
A cell to be evaluated (serving cell) number (for example, physical identification number (PCI: Physical Cell Identity) of the cell 501 in LTE),
The radio quality (for example, RSRQ, SINR, etc.) associated with the belonging cell number, the measurement time of the communication speed, the radio quality, and the measurement result of the communication speed are included. Of course, the representative point information 3031 is not limited to the above items and combinations.

The evaluation score information 3032 is transmitted from the evaluation score measuring machine 20 via the network 40, for example.
-Position information of evaluation points (for example, latitude and longitude of evaluation points),
A cell to be evaluated (attached cell) number (for example, physical identification number PCI of cell 501 in LTE),
-The measurement time of radio quality (for example, RSRQ, SINR, etc.) and the measurement result are included. Of course, the evaluation point information 3032 is not limited to the above items and combinations.

The estimation result information 3033 is sent from the estimation unit 304.
-Position information of evaluation points (for example, latitude and longitude of evaluation points),
-Estimated communication speed time and estimated communication speed,
including. Note that the estimation result information 3033 may be aggregated into the evaluation point information 3032. Of course, the estimation result information 3033 is not limited to the above items and combinations.

  Based on the information stored in the database 303, the estimation unit 304 estimates the simultaneous connection number and the communication speed of the evaluation point, and stores the estimated result in the estimation result information 3033 of the database 303.

The simultaneous connection number estimation unit 3041 estimates the number of simultaneous connections of the evaluation target cell based on the representative point information 3031. Specifically, based on the signal-to-interference noise ratio (SINR (t ₁ )) of the evaluation target cell at a certain time t ₁ and the communication speed (TP (t ₁ )), for example, And calculate the number of simultaneous connections (EAN (t ₁ )).

・・・(2)

... (2)

Note that f (SINR) is a conversion formula for calculating the maximum transfer rate TP _max from the SINR and the system bandwidth. The conversion equation is, for example, Shannon theory (Shannon-Hartley's law: channel capacity (upper limit) C of the band W disturbed by the white thermal noise N when the average transmission power is limited to P is C = W × log 2 (1 + P / N)) and is expressed as the following equation (3).

・・・(3)

... (3)

  Here, BW is a system bandwidth, and α is a coefficient indicating the amount of deterioration from the theoretical limit (Shannon limit) that occurs depending on the implementation of the receiver, for example, α = 0.6.

As another method for predicting TP _max , instead of using the Shannon theory, a table of communication speed with respect to SINR may be created in advance (a storage device in the evaluation device 30), and the table may be referred to. For example, you may create based on the transmission rate determined according to the receiving condition of the packet sequence of a nonpatent literature 3 or 4.

The communication speed estimation unit 3042
As the evaluation point information 3032,
・ Measurement time,
-Cell number to be evaluated,
Radio quality (eg signal to interference / noise ratio SINR),
As representative point information 3031-Estimated time of the number of simultaneous connections,
・ Estimated results of simultaneous connection
Obtain the cell number to be evaluated from the database 303.

A signal-to-interference and noise ratio SINR at the same time _{(t 1)} in the evaluation target cell _{(t 1),} based on the estimation result of the concurrent number EAN _{(t 1),} for example using the following formula (4), the The communication speed (TP (t ₁ )) at the evaluation point at time (t ₁ ) is estimated, and the result is stored in the estimation result information 3033 of the database 303. In the following formula (4), the conversion formula f (SINR) is the same as the conversion formula f of the above formula (3).

・・・(4)

···(Four)

  The input unit 3051 inputs information on the evaluation target point, and inputs information for inquiring the database 303 about the evaluation result.

  The display unit 3052 displays the evaluation result retrieved from the database 303 by an input (for example, a command or the like) from the input unit 3051, although not particularly limited, for example, as a stage chart. Here, for example, as shown in FIG. 5 (A), a staged chart is a mark that is staged according to the communication speed based on the measured communication speed at the representative point and the estimated communication speed at the evaluation point. Display on a map. Further, a comparison graph of the communication speeds of the selected representative points and evaluation points may be displayed. In FIG. 5B, the throughput (communication speed) of the representative point is calculated as 3.2 Mbps (Megabits Per Second), and the throughput (communication speed) of the evaluation point is calculated as 7.0 Mbps. The stage chart may be stored as a file instead of being displayed on the display unit 3052 and printed out to a printer (not shown) or the like.

  Next, the operation of the representative point measuring machine 10 shown in FIG. 2 will be described with reference to the flowchart of FIG.

  The communication speed measuring unit 1032 of the representative point measuring device 10 receives the data from the network 40 via the base station 50, thereby measuring the communication speed (step S100). Further, the representative point measuring device 10 measures the wireless quality (step S101).

  The representative point measuring machine 10 compares the number of measurement results (number of processes) with a threshold (step S102), and if the number of processes is larger than the threshold (Yes in step S102), the measurement result (for example, SINR, measurement) The time, the PCI of the evaluation target cell, etc.) are transmitted to the evaluation device 30 (step S103), and the process returns to step (S100).

  On the other hand, in the representative point measuring machine 10, when the number of measurement results (number of processes) is equal to or less than the threshold (No in step S102), the process returns to step (S100), and the measurement of the communication speed and the wireless quality is repeated. Note that the communication speed measurement (step S100) and the wireless quality measurement (step S101) may be operated in reverse order. The representative point measuring device 10 may store the communication speed and wireless quality measurement results of steps S100 and S101 in a storage device (not shown) together with position information and measurement time information.

  Next, the operation of the evaluation point measuring machine 20 shown in FIG. 3 will be described with reference to the flowchart of FIG.

  The measuring unit 203 of the evaluation point measuring device 20 measures the radio quality of the evaluation target cell at the evaluation point (step S200).

  The measuring unit 203 of the evaluation point measuring machine 20 compares the number of measurement results (number of processes) with a threshold value (step S202), and the number of measurement results (number of processes) is greater than the threshold value (Yes in step S201). ), The measurement result (for example, SINR, PID of the evaluation target cell, measurement time, etc.) is transmitted from the wireless communication unit 202 to the evaluation device 30 via the base station 50 (step S202), and the process returns to step (S200). If the number of measurement results (number of processes) is equal to or less than the threshold value (No in step S201), the process returns to step (S200). In the determination in step S201, a method different from the method using the number of processes may be used. For example, a method of determining whether the processing time exceeds a threshold value may be used. The evaluation point measuring machine 20 may store the measurement result of the wireless quality in step S200 together with position information and measurement time information in a storage device (not shown).

  Next, with reference to the flowchart of FIG. 8, the processing procedure when the measurement information is received from the representative point measuring machine 10 and the evaluation point measuring machine 20 in the evaluation apparatus 30 shown in FIG. 4 will be described.

  First, when representative point information is received from the representative point measuring machine 10 (Yes in step S300), the received information is written in the database 303 as representative point information 3031 (step S301).

  When the representative point information is not received from the representative point measuring machine 10 (No in step S300), the process proceeds to the next step (S302).

  Next, when the evaluation point information is received from the evaluation point measuring machine 20 (Yes in step S302), the received information is written in the database 303 as the evaluation point information 3032 (step S303), and the process is terminated.

  When evaluation score information has not been received from the evaluation score measuring machine 20 (No in step S302), the process is terminated.

  Note that reception and writing of representative point information (steps S300 and S301) and reception and writing of evaluation point information (steps S302 and S303) may be performed in the reverse order.

  Next, a processing procedure for estimating the communication speed in the estimation unit 304 of the evaluation device 30 will be described with reference to the flowchart of FIG.

  First, the estimation unit 304 refers to the evaluation point information 3032 and confirms whether there is an unprocessed evaluation point. If there is an unprocessed evaluation point, the estimation unit 304 enters a loop process (unprocessed evaluation point scanning). (Step S400).

  If there is no unprocessed evaluation point, the estimation unit 304 exits the loop process (unprocessed evaluation point scanning) (step S406) (EXIT) and ends the process.

  In the loop process (unprocessed evaluation point scanning), the estimation unit 304 first selects one unprocessed evaluation point (step S401).

  The estimation unit 304 confirms whether or not the corresponding representative point information at the same time exists for the evaluation point information on the selected unprocessed evaluation point (step S402). Specifically, representative point information (measurement information measured by a representative point measuring machine) in which the cell numbers to be evaluated match and the measurement time is within an allowable range (for example, within a range of 10 seconds, 1 minute, 5 minutes). ) As information at the same time.

  When there is representative point information at the same time corresponding to the evaluation point information (Yes in step S402), the simultaneous connection number estimating unit 3041 of the estimation unit 304 estimates the simultaneous connection number of the evaluation target cell (step S403). ).

  If there is no corresponding representative point information at the same time corresponding to the evaluation point information, the process moves to step S406.

  Next, the communication speed estimation unit 3042 of the estimation unit 304 estimates the communication speed (step S404).

  The communication speed estimation unit 3042 writes the estimation result as the estimation result information 3033 of the database 303 (step S405).

  When the unprocessed evaluation score remains, the estimation unit 304 returns to the top of the loop processing in step S400 (step S406). If there are no unprocessed evaluation points remaining, the process exits the loop process of S400 to S406 and ends the communication speed estimation process.

  In addition, when the estimation result of the simultaneous connection number with respect to the same evaluation object cell at the same time is already calculated, the process to skip may be included.

  Next, an example of a processing procedure for displaying the evaluation result in the evaluation device 30 will be described with reference to the flowchart of FIG.

  Evaluation area information is input from the outside of the evaluation device 30 (step S500). The evaluation area information may be input from the input unit 3051 or may be transferred from the terminal or the like to the evaluation device 30 via a network.

  The evaluation apparatus 30 reads information on the area from the database 303 (step S501), and displays the read information on the display unit 3052 as an evaluation result (step S502). In addition, instead of displaying the evaluation result on the display unit 3052 of the evaluation device 30 by mounting the evaluation device 30 on the server, the evaluation device 30 is transmitted to a client (terminal) connected via the network, and the client (terminal) You may make it display on a display part.

  The effect of this Embodiment is demonstrated below.

According to this embodiment,
-Estimate the number of simultaneous connections based on information measured by a representative point measuring machine,
-Estimate the communication speed at the evaluation point where only the wireless quality was measured based on the estimated number of simultaneous connections. For this reason, it is not necessary to measure the communication speed at multiple points at the same time, and it is possible to grasp the communication speed characteristics at a point different from the representative point where the wireless quality measurement was performed while reducing the load on the network. .

<Second Exemplary Embodiment>
The second exemplary embodiment of the present invention is based on the wireless quality information not depending on the wireless load at the evaluation point acquired in advance and the measurement result of the wireless quality and the communication speed measured at the representative point. Estimate the communication speed.

  FIG. 11 shows a schematic diagram of a wireless network evaluation system in the second embodiment. In this system, the evaluation point measuring machine 20 is deleted from the configuration in the embodiment shown in FIG. 1, and the evaluation device 30 is replaced with an evaluation device 31. Also, representative point measuring machines 10-a and 10-b are provided in the cells 501-a and 501-b, respectively. Since other components are the same, description thereof is omitted.

  FIG. 12 is a diagram illustrating the configuration of the evaluation apparatus 31 in FIG. Referring to FIG. 12, the evaluation apparatus 31 includes a database 313 for storing representative point information 3131, evaluation point information 3132, and estimation result information 3033 instead of the database 303 of the evaluation apparatus 30 described with reference to FIG. Yes.

  Referring to FIG. 12, the evaluation apparatus 31 includes a wireless load estimation unit 3143, a signal-to-interference noise ratio, in addition to the configuration of the estimation unit 304 (simultaneously connected number estimation unit 3041, communication speed estimation unit 3042) in FIG. An estimation unit 314 further including an estimation unit 3144 is provided. In the estimation unit 314 in FIG. 12, the simultaneous connection number estimation unit 3041 and the communication speed estimation unit 3042 are the same as those in FIG.

The representative point information 3131 is transmitted from the representative point measuring machines 10-a and 10-b installed in each cell via the network 40, respectively.
・ Representative point position information (for example, representative point latitude and longitude information),
A cell (service cell) number to be evaluated (for example, physical identification number PCI of the cell 501 in LTE),
The radio quality (for example, RSRQ, SINR, etc.) associated with each cell number, the measurement time of the communication speed, and the measurement result are included. Of course, the representative point information 3131 is not limited to the above items and combinations.

The evaluation score information 3132 is different from the radio quality (for example, SINR) of the evaluation score information 3032 of the database 303 of FIG. 4 described in the first exemplary embodiment, Radio quality information (for example, RSRPi (t ₀ ) in LTE, etc. in LTE) of neighboring cells (i: cells 501-a and 501-b in the example of FIG. 11).

Note that the radio quality information of the evaluation target cell and the neighboring cell (i) includes, for example, radio wave propagation estimation (for example, Okumura / Kashiwa curve (radio wave propagation characteristics between a base station and a mobile station, Actual tests are conducted in each area such as cities and large cities, and based on the aggregated data, propagation loss approximation formula _LOH = A + Blog (d)-a (hm) + C: A and B are common to each area The value calculated based on)) may be used. Alternatively, it may be a value calculated by an area design tool of the cellular system. Alternatively, it may be wireless quality information carried by an in-vehicle measuring machine or a measurer and acquired while moving a plurality of evaluation points.

  Although not particularly limited, in the following, as an example, each unit of the estimation unit 314 will be described using LTE as an example.

From the representative point information 3131, the radio load estimation unit 3143 receives SINR _i (t ₁ ) of each cell (i = 1, 2,...) And radio quality information (RSRQ _i (t ₁ ) depending on the radio load. ) And the wireless load (Load _i (t ₁ )) of each cell (i) is calculated using, for example, the following equation (5).

・・・(5)

···(Five)

The signal-to-interference / noise ratio estimation unit 3144 includes the radio quality information (Load _i (t ₁ )) calculated by the radio load estimation unit 3143 and independent of the radio load of each cell at the evaluation point ( RSRP _i (t ₀ )) is used to calculate a signal-to-interference noise ratio (SINR _d (t ₁ )) for the signal of the evaluation target cell (d) using, for example, the following equation (6).

・・・(6)

... (6)

  Here, N represents the number of RSRPs acquired at the evaluation point, and Noise represents noise. The communication speed estimation unit 3042 and the simultaneous connection number estimation unit 3041 differ only in the acquisition route of the information used by each, and the communication speed estimation unit 3042 of the first embodiment described with reference to FIG. Since it is equal to the simultaneous connection number estimating unit 3041, the description is omitted as described above.

  Next, the operation of the present embodiment will be described. Note that the display operation of the evaluation apparatus 31 is the same as that of the first exemplary embodiment shown in FIG. In addition, the writing process of the measurement information from the representative point measuring machine 10 to the database 313 is also equivalent to the process of skipping the evaluation point information process, and the description thereof is omitted.

  With reference to the flowchart of FIG. 13, the procedure for creating the stored information of the evaluation point information 3132 in the database 313 of the evaluation device 31 will be described using a method using radio wave propagation estimation as an example.

  First, a base station to be evaluated and a base station that considers interference are arranged on a map around the position where the representative point measuring device 10 is installed (step S610).

  Next, the evaluation device 31 determines an evaluation point where the communication speed is estimated (step S611), and enters a loop process (unprocessed evaluation point scanning) (step S612).

  The evaluation device 31 selects one evaluation point (step S613), and estimates a propagation loss based on the positional relationship between the base station and the evaluation point (step S614).

  Based on the estimated propagation loss and the parameters of the base station and the radio assumed to be received (for example, transmission antenna gain, transmission power, reception antenna gain, etc.), the wireless quality independent of the wireless load at the evaluation point (for example, in LTE) RSRP) is estimated and written in the evaluation point information 3132 of the database 313 (step S615).

  The estimation unit 314 of the evaluation device 31 checks whether or not an unprocessed evaluation point remains (step S616), and if it remains, continues the loop processing (unprocessed evaluation point scanning) from step S612. If not, the process ends.

  Next, operations of the simultaneous connection number estimating unit 3041 and the wireless load estimating unit 3143 after the representative point information 3131 in the evaluation device 31 of the present embodiment is stored in the database 313 will be described with reference to the flowchart of FIG. To do.

  The estimation unit 314 first enters a loop process (service cell scan) for scanning a cell in which the wireless load and the number of simultaneously connected persons in the representative point information 3131 are not estimated (step S710).

  If there is no cell for which the wireless load and the number of simultaneous connections are not estimated, the estimation unit 314 exits the loop processing (service cell scanning) from step S710 to S714 and ends the processing.

  If there is a cell for which the wireless load and the number of simultaneous connections are not estimated, the estimation unit 314 selects a cell targeted for evaluation service (referred to as “service cell” or “evaluation service cell”) (step S711).

  The wireless load estimation unit 3143 of the estimation unit 314 calculates the wireless load based on, for example, the above equation (5) (step S712).

  Then, the simultaneous connection number estimation unit 3041 of the estimation unit 314 calculates the number of simultaneous connections based on the formula (2) (step S713).

  The estimation unit 314 confirms whether there are any remaining service cells for which the wireless load and the number of simultaneously connected users are not estimated (step S714). When service cells that have not been estimated remain, the loop processing (service cell scanning) from step S710 is continued, and when there are no remaining service cells, the processing ends.

  Next, the operation of the communication speed estimation unit 3042 after the simultaneous connection number estimation and wireless load estimation processing in the estimation unit 314 of the evaluation device 31 of the present embodiment will be described with reference to the flowchart of FIG.

  First, the estimation unit 314 refers to the representative point information 3131 and the evaluation point information 3132 to check whether there is an unprocessed evaluation point. If there is an unprocessed evaluation point, a loop process (unprocessed evaluation) is performed. Point scanning) (step S410).

  If there is no unprocessed evaluation point, the estimation unit 314 exits the loop processing (unprocessed evaluation point scanning) from step S410 to S4118 and ends the process.

  If there is an unprocessed evaluation score, the estimation unit 314 selects one unprocessed evaluation score (step S411).

  The estimation unit 314 enters a loop process (evaluation service cell scan) from step S412 to S417 for scanning the evaluation target cell at the selected unprocessed evaluation point (step S412).

  The estimation unit 314 selects an evaluation service cell (step S413).

  The signal-to-interference noise ratio estimation unit 3144 of the estimation unit 314 calculates a signal-to-interference noise ratio using the signal of the evaluation target cell as a desired wave using, for example, the above equation (6) (step S414).

  The communication speed estimation unit 3042 of the estimation unit 314 calculates the communication speed at the evaluation point in the cell to be evaluated using, for example, the above equation (4) (step S415), and the communication speed estimation result is obtained as estimation result information. 3033 is written (step S416).

  The estimation unit 314 confirms whether or not an unprocessed evaluation service cell at the evaluation point remains (step S417). When the unprocessed evaluation service cell remains, the estimation unit 314 continues the loop processing (evaluation service cell scanning) from step S412. If there is no unprocessed cell to be evaluated, the process goes from step S412 to step S417 through the loop processing (evaluation service cell scanning) to step S418.

  In step S418, the estimation unit 314 checks whether or not an unprocessed evaluation point remains. If unprocessed evaluation points remain, the loop processing (unprocessed evaluation point scanning) from step S410 is continued. If there are no unprocessed evaluation points remaining, the estimation unit 314 exits the loop processing (unprocessed evaluation point scanning) from step S410 to S418 and ends the communication speed estimation processing.

<Description of the effects of the second embodiment>
According to this embodiment,
・ The number of simultaneous connections estimated based on representative point information acquired by a representative point measuring machine,
The communication speed at the evaluation point is estimated based on the wireless quality information that does not depend on the wireless load at the evaluation point acquired in advance at the evaluation point. By adopting such a configuration, as compared with the first exemplary embodiment, since there is no restriction on acquiring wireless quality at a plurality of evaluation points in the same time zone, more evaluation points are selected. Things will be possible. As a result, it is possible to estimate the surface communication speed within the area to be evaluated (see FIG. 16A). FIG. 16 is a diagram schematically illustrating an example in which the evaluation result according to the present embodiment is displayed on the display unit 3052. FIG. 16A is a stage chroma diagram corresponding to FIG. 5A of the first exemplary embodiment. FIG. 16B corresponds to FIG. 5B of the first exemplary embodiment, and shows the throughput (communication speed) of the representative points and the evaluation points.

  Further, by continuously acquiring the communication speed at the representative point, it is also possible to compare the time transition (time characteristic) of the communication speed between the representative point and the selected evaluation point (FIG. 16). (See (C)). In FIG. 16C, the transition in the time direction of the throughput (communication speed) (vertical axis: unit Mbps) at the representative point and evaluation point in FIG. 16A is a time-series graph (representative point: solid line, evaluation point). : Dashed line)

  In addition, at the evaluation point, it is possible to grasp the communication speed when connected to a cell other than a cell having a good radio quality (for example, a cell having the highest RSRP). At the evaluation point, it is not necessary to measure the wireless quality in accordance with the measurement at the representative point, reducing the load on the network due to the transmission of wireless quality information at the evaluation point, and reducing the equipment and human costs in the measurement It is possible.

<Third exemplary embodiment>
The third exemplary embodiment of the present invention determines the communication speed at the evaluation point based on the wireless quality information not depending on the wireless load at the evaluation point acquired in advance and the measurement result of the wireless quality measured at the representative point. presume.

  FIG. 17 is a diagram schematically illustrating a wireless network evaluation system according to the third embodiment of the present invention. The system of the present embodiment replaces the representative point measuring machines 10-a and 10-b in the second exemplary embodiment shown in FIG. 11 with representative point measuring machines 12-a and 12-b, respectively. The evaluation device 31 in FIG. 11 is replaced with an evaluation device 32. Since other components are the same, description thereof will be omitted as appropriate. The representative point measuring machines 12-a and 12-b have the same configuration, and are referred to by the representative point measuring machine 12 when referred to without distinction.

  FIG. 18 is a diagram illustrating a specific configuration of the representative point measuring machine 12 in the third exemplary embodiment. Referring to FIG. 18, the representative point measuring machine 12 is configured by deleting the communication speed measuring function 1032 from the representative point measuring machine 10 of the first exemplary embodiment shown in FIG. The representative point measuring machine 12 has the same configuration as the evaluation point measuring machine 20 of the first exemplary embodiment described with reference to FIG.

  FIG. 19 is a diagram illustrating a specific configuration of the evaluation device 32 in the present embodiment. Referring to FIG. 19, the database 323 of the evaluation device 32 includes representative point information 3231 instead of the representative point information 3131 of the database 313 of the evaluation device 31 of the second exemplary embodiment shown in FIG. I have. Referring to FIG. 19, instead of the simultaneous connection number estimation unit 3041 of the estimation unit 314 in FIG. 12, the estimation unit 324 includes a simultaneous connection number estimation unit 3141 that estimates the simultaneous connection number based on the wireless load estimation result. I have. In FIG. 19, since the other configuration is the same as that of the evaluation apparatus 31 of FIG.

The representative point information 3231 is transmitted from the representative point measuring machines 12-a and 12-b installed in the cells 501-a and 501-b via the network 40, respectively.
・ Representative point position information (for example, the latitude and longitude of the representative point),
A cell to be evaluated (attached cell) number (for example, physical identification number PCI of the cells 501 (a and b) in LTE),
The measurement time of radio quality (for example, RSRQ, SINR, etc.) associated with each cell number and the measurement result are included. Of course, the representative point information 3231 is not limited to the above items and combinations.

  The simultaneous connection number estimating unit 3141 is calculated by the wireless load estimating unit 3143, based on the number of simultaneous connections that are associated in advance with respect to the wireless load of the base station 50-a / 50-b to be evaluated. The number of simultaneously connected base stations 50-a / 50-b to be evaluated is calculated. The number of simultaneous connections associated with the wireless load in advance is calculated using, for example, an approximate expression calculated based on the correlation between the number of simultaneous connections and the wireless load from system level simulation or actual operation information. The Specifically, the correlation between the number of simultaneously connected users and the wireless load is acquired in advance by system level simulation or actual measurement, and the simultaneously connected number estimating unit 3141 uses an approximate expression (PRB function F (for example, polynomial) of the following equation (7): An approximate expression is created by obtaining the coefficients (α, β, γ).

・・・(7)

... (7)

  For example, when the approximate expression (7) is a quadratic polynomial, the following expression (8) is obtained. The simultaneous connection number estimating unit 3141 calculates EAN by calculating coefficients (α, β, γ), for example, by the method of least squares for Expression (8).

・・・(8)

... (8)

  Next, the operation of the present embodiment will be described. With reference to the flowchart of FIG. 20, operation | movement of the representative point measuring machine 12 of this Embodiment is demonstrated.

  The representative point measuring device 12 measures the wireless quality (step S120). The number of measurement results and the threshold value are compared (step S121).

  When the number of measurement results (the number of processes) is larger than the threshold (Yes in step S121), the measurement result (for example, SINR, measurement time, PCI of evaluation target cell, etc.) is transmitted to the evaluation device 30 (step S122). ), The process returns to the first step (S120).

  When the number of measurement results (the number of processes) is equal to or less than the threshold value (No in step S121), the process returns to the first step (S120).

In this embodiment,
A process of writing information to the database 323 in the evaluation device 32;
Processing of communication speed estimation in the estimation unit 314,
The processing of the input / output unit 305 is the same as the operation of the second exemplary embodiment, and a description thereof will be omitted.

  In the second embodiment, in the simultaneous connection number estimating process in step S713 of FIG. 14, the simultaneous connection number is calculated from the communication speed and the wireless quality measurement result in the representative point information 3131. In the present embodiment, the estimation process in the simultaneous connection number estimating unit 3141 is different in that the simultaneous connection number is calculated based on the wireless load calculated in step S712 in FIG. However, since the entire processing steps of the simultaneous connection number estimating process in this embodiment are the same as those in the second exemplary embodiment described with reference to FIG. 14, the description of the operation is omitted.

  The effect of this Embodiment is demonstrated. In the present embodiment, the first or second example is described by estimating the wireless load based on the information acquired by the representative point measuring device, and estimating the number of simultaneously connected persons using the estimated wireless load. It is possible to reduce the load on the network due to the communication speed measurement in the exemplary embodiment.

<Modification>
Hereinafter, modifications of the first, second, and third embodiments will be described.

  In the first, second, and third embodiments, the information acquired by the representative point measuring device 10 or the evaluation point measuring device 20 is transmitted to the evaluation device 30 via the base station 50 to be evaluated. Of course, the configuration is not limited thereto. For example, another wireless device (for example, a wireless local area network (LAN)) may be provided and transmitted via a network of another wireless device. Alternatively, information acquired by the representative point measuring device 10 or the evaluation point measuring device 20 is stored in a portable storage medium installed in the measuring device 10 or 20, and a storage medium reading device is stored in the database of the evaluation device 30. You may enter via.

  In the first, second, and third embodiments, the configuration example in which the database and the estimation unit are provided in the evaluation apparatus 30 has been described. However, it is needless to say that the configuration is not limited thereto. For example, it may be arranged on the network as an external function of the evaluation device 30.

  In the first, second, and third embodiments, the configuration example in which the estimation unit is provided in the evaluation apparatus has been described, but it is needless to say that the configuration is not limited to this configuration. For example, the representative point measuring machine 10 and the evaluation point measuring machine 20 may have a partial function of the estimation unit.

  In the first, second, and third embodiments, the example in which the database (303, 313, 323) is one of the configurations in the evaluation apparatus 30 has been described. However, the configuration is not limited to such a configuration. Of course. For example, it may be stored in the memory of the evaluation device 30 and processed. Further, data in a file format may be stored instead of the database.

  In the first, second, and third embodiments, the display of the result is graded by a pattern. However, the present invention is not limited to this configuration. For example, the graded color may be given by hue.

  In the second and third embodiments, representative point measuring machines (10-a and 10-b, 12-a and 12-b) are installed in all the cells (501-a and 501-b), Although the configuration example for estimating the wireless load of each cell has been described based on the measurement result, it is needless to say that the configuration is not limited to this configuration.

  As a modified example, for example, a value obtained by measuring a wireless load of a cell in which no representative point measuring device is installed with a representative point measuring device installed in a peripheral cell may be used. Specifically, the representative point measuring device acquires not only the belonging cell but also the SRINR and RSRQ of the cell in which the representative point measuring device is not installed, and calculates the wireless load using the above equation (5). Also good. Moreover, you may use the average of the radio | wireless load in the cell in which the surrounding representative point measuring device 10 was installed for the wireless load of the cell in which the representative point measuring device is not installed. Alternatively, when the RSRP of the neighboring cell is equal to or less than a specified value (although not particularly limited, for example, 20 dB or more lower than the RSRP of the belonging cell), the radio load of the cell may be substituted with an appropriate value.

  According to the above modification, there is no need to install representative point measuring machines for all the cells to be considered in the evaluation points, and the representative point measuring machines are installed only in some of the cells. Can be reduced.

In the second and third embodiments, the RSRQ and SINR are used in the estimation of the radio load in LTE. However, the configuration is not limited to this configuration. For example, the RSRP, the RSSI, and the SINR are used as follows. The wireless load Load _i (t ₁ ) may be estimated using Equation (9).

・・・(9)

... (9)

Here, RB _N is the number of resource blocks, for example, the bandwidth is 50 in the case of 10 MHz.

In the second and third embodiments, the RSRQ and SINR are used in the estimation of the radio load in LTE. However, the configuration is not limited to such a configuration, and the representative point measuring device 10 uses the evaluation target service cell. The RSRP _d and RSRQ _d of (d) and the RSRP _i of neighboring cells may be acquired, and the wireless load Load _d may be calculated using, for example, the following equation (10).

・・・(10)

···(Ten)

In the second and third embodiments, LTE has been described as an example in wireless load estimation. However, the present invention is not limited to this configuration, and W-CDMA (Wideband Code Division Multiple Access; WCDMA is NTT Corporation). (A registered trademark of DOCOMO). In that case, RSCP (Received Signal Code Power) is used as a radio quality index that does not depend on the radio load, and RSSI or Ec / No (bandwidth) is used as a radio quality index that depends on the radio load. For example, the wireless load Load _i (t ₁ ) may be calculated according to the following equation (11).

・・・(11)

... (11)

  Here, SF is a spreading factor.

  The present invention can be applied to a system for evaluating the quality of a cellular network.

  It should be noted that the disclosures of the above-mentioned patent documents and non-patent documents are incorporated herein by reference. Within the scope of the entire disclosure (including claims) of the present invention, the embodiments and examples can be changed and adjusted based on the basic technical concept. Various combinations or selections of various disclosed elements (including each element of each claim, each element of each embodiment, each element of each drawing, etc.) are possible within the scope of the claims of the present invention. . That is, the present invention of course includes various variations and modifications that could be made by those skilled in the art according to the entire disclosure including the claims and the technical idea.

10, 10-a, 10-b, 12, 12-a, 12-b Representative point measuring machine 20 Evaluation point measuring machine 30, 31, 32 Evaluation device 40 Network 50, 50-a, 50-b Base station 101, 201 Antenna 102, 202 Wireless communication unit 103, 203 Measuring unit 203 Measuring unit 301 Receiving unit 302 Searching unit 303, 313, 323 Database 304, 314, 324 Estimating unit 305 Input / output units 501, 501-a, 501- b Cell 1031, 2031 Radio quality measurement unit 1032 Communication speed measurement unit 3031, 3131, 3231 Representative point information 3032, 3132 Evaluation point information 3033 Estimation result information 3041, 3141 Simultaneously connected number estimation unit 3042 Communication speed estimation unit 3051 Input unit 3052 Display Unit 3143 wireless load estimation unit 3144 signal-to-interference noise ratio estimation unit

Claims (10)

A communication speed estimation means for estimating the communication speed of the terminal at the point using the throughput calculated from the signal-to-interference noise ratio at the point, and the number of simultaneous connections;
Based on the network quality measured in the cell with the location covered, the simultaneous connection number estimating means for estimating the number of simultaneous connections,
A wireless network evaluation device characterized by comprising: The network quality measured in the cell is
Including a communication speed and a signal-to-interference and noise ratio measured in a cell covering the point,
The simultaneous connection number estimating means is:
Based on the correspondence relationship between the signal-to-interference noise ratio and the throughput, a throughput corresponding to the signal-to-interference noise ratio measured in the cell is derived, and the derived throughput and the measured in the cell The wireless network evaluation apparatus according to claim 1, wherein the simultaneous connection number is estimated based on a communication speed. The network quality is
A signal-to-interference and noise ratio measured in a cell covering the point; and
A wireless load calculated based on the wireless quality of the reference signal measured in the cell;
Including
Radio load estimation means for estimating the radio load based on radio quality of the reference signal measured in the cell,
The simultaneous connection number estimating means is:
According to the correspondence between the wireless load and the number of simultaneously connected persons, the number of simultaneously connected persons corresponding to the wireless load estimated by the wireless load estimating means is estimated,
The communication speed estimation means includes
The wireless network evaluation apparatus according to claim 1, wherein the communication speed at the point is estimated based on the estimated number of simultaneous connections and a signal-to-interference noise ratio at the point.   The radio network according to any one of claims 1 to 3, wherein the signal-to-interference noise ratio at the point is a signal-to-interference noise ratio measured by a measuring device installed at the point. Evaluation device. Radio load estimation means for estimating a radio load based on a signal-to-interference noise ratio measured in a cell having the point as a coverage and a radio quality of a reference signal measured in advance at the point;
A signal-to-interference noise ratio estimation unit that estimates a signal-to-interference noise ratio at the point based on the received power of the reference signal measured in advance at the point and the wireless load calculated by the wireless load estimation unit When,
The wireless network evaluation device according to claim 1, further comprising: Radio load estimation means for estimating a radio load based on a signal-to-interference noise ratio measured in a cell having the point as a coverage and a radio quality of a reference signal measured at the point;
Based on the estimated reception power of the reference signal calculated based on the estimation result of the propagation loss calculated according to the positional relationship between the base station and the point, and based on the wireless load calculated by the wireless load estimating means A signal-to-interference noise ratio estimating means for estimating a signal-to-interference noise ratio at the point;
The wireless network evaluation device according to claim 1, further comprising: Input means for inputting the point to be estimated for the communication speed;
7. The display device according to claim 1, further comprising: a display unit configured to display the estimated communication speed on the map of the cell in a form that can be discriminated. The wireless network evaluation device according to any one of the above. A measuring terminal that measures network quality in a cell that covers the point;
A base station having jurisdiction over the cell;
A wireless network evaluation system comprising: the wireless network evaluation device according to claim 1 connected to the base station. Estimate the number of simultaneous connections based on network quality measured in a cell that covers a point,
A wireless network evaluation method, comprising: estimating a communication speed of a terminal at the point using a throughput calculated from a signal-to-interference noise ratio at the point and the simultaneous connection person. Based on the network quality measured in the cell that covers the point, the simultaneous connection number estimation process that estimates the number of simultaneous connections,
A communication speed estimation process for estimating the communication speed of the terminal at the point using the throughput calculated from the signal-to-interference noise ratio at the point and the number of simultaneously connected people,
A program that causes a computer to execute.

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