JP6399791B2 - Measuring apparatus and measuring method - Google Patents

Description

  The present invention relates to a measuring apparatus and the like.

  In a wireless local area network (LAN), communication quality troubles such as slow communication and easy disconnection may occur. There are many causes for this wireless LAN trouble. For example, the cause of the trouble includes a design error of the wireless LAN system, the magnitude of traffic inside and outside the business, radio wave intensity, noise, equipment failure, and factors other than the wireless LAN.

  There are a wide variety of methods for evaluating wireless LAN communication quality troubles. For example, in order to investigate whether there is a design error, the design and settings are reviewed. In order to evaluate the size of business traffic, the amount of traffic is examined using a LAN monitoring device. In order to examine non-business traffic, the corresponding access point is investigated. In order to evaluate the radio field intensity, the distribution of the radio field intensity at points on the floor is investigated. To evaluate noise, a spectrum analyzer is used. To evaluate equipment failure, investigate equipment maintenance manuals.

JP 2005-506721 A

  However, the above-described conventional technology has a problem that the communication quality of the wireless LAN cannot be evaluated efficiently.

  In general, when a communication quality problem occurs, it is difficult to clearly determine whether or not the wireless LAN itself is a problem. For this reason, the engineer investigates the cause of the communication quality trouble from an original viewpoint based on the personal experience, but the cause of the trouble is not known, and the investigation may be wasted. Moreover, since the trouble evaluation methods are diverse as described above, it takes time to find the cause of the trouble.

  An object of one aspect is to provide a measurement apparatus and a measurement method that can efficiently evaluate the communication quality of a wireless LAN.

  In the first plan, the measurement apparatus includes an acquisition unit, a calculation unit, and a creation unit. The acquisition unit acquires a frame transmitted / received by wireless communication between the access point and the terminal device. The calculation unit calculates the radio wave occupancy rate of each channel used in wireless communication, the frame bit rate, and the frame retry rate for each time based on the attribute information of multiple frames acquired by the acquisition unit To do. The creation unit, based on the calculation result of the calculation unit, a graph showing the relationship between the time and the radio wave occupation rate for each channel, a graph showing the relationship between the time and the bit rate of the frame, and the retry rate of the time and the frame And a graph showing the relationship between.

  According to one embodiment of the present invention, there is an effect that communication quality of a wireless LAN can be efficiently evaluated.

FIG. 1 is a diagram illustrating a configuration of a system according to the present embodiment. FIG. 2 is a diagram illustrating an example of a data structure of a frame. FIG. 3 is a diagram illustrating the relationship between the frame path and the MAC addresses stored in the first to fourth addresses. FIG. 4 is a functional block diagram illustrating the configuration of the measurement apparatus according to the present embodiment. FIG. 5 is a diagram illustrating an example of the data structure of the frame storage table. FIG. 6 is a diagram illustrating an example of the data structure of the AP list. FIG. 7 is a diagram illustrating an example of a data structure of the terminal list. FIG. 8 is a diagram illustrating an example of the data structure of the roaming table. FIG. 9 is a diagram illustrating an example of a graph of radio wave occupation ratio. FIG. 10 is a diagram (1) illustrating an example of a graph of the average bit rate. FIG. 11 is a diagram (2) illustrating an example of a graph of the average bit rate. FIG. 12 is a diagram (1) illustrating an example of a retry rate graph. FIG. 13 is a diagram (2) illustrating an example of a retry rate graph. FIG. 14 is a diagram (1) illustrating an example of a graph of the elapsed time of the number of devices. FIG. 15 is a diagram (2) illustrating an example of a graph of the elapsed time of the number of devices. FIG. 16 is a diagram illustrating an example of a roaming time lapse graph. FIG. 17 is a flowchart illustrating an example of a processing procedure of the measurement apparatus according to the present embodiment.

  Embodiments of a measuring apparatus and a measuring method disclosed in the present application will be described below in detail with reference to the drawings. Note that the present invention is not limited to the embodiments.

  An example of the system configuration of this embodiment will be described. FIG. 1 is a diagram illustrating a configuration of a system according to the present embodiment. As shown in FIG. 1, this system includes terminal devices 10a, 10b, 10c, 10d, 10e, and 10f. Further, this system includes APs (Access Points) 20a, 20b, 20c, and 20d, and a measuring apparatus 100. In the following description, the terminal devices 10a to 10f are collectively referred to as the terminal device 10 as appropriate. APs 20a, 20b, 20c, and 20d are collectively referred to as AP20.

  The terminal devices 10a to 10c are connected to the AP 20 via a wireless LAN (Local Area Network). The terminal devices 10d to 10f and the APs 20a to AP20d are connected to the network 50. This system may include terminal devices other than the terminal devices 10a to 10f. Moreover, APs other than APs 20a to 20d may be included.

  The terminal device 10 is a device that transmits and receives frames to and from other terminal devices 10 via the network 50 and the AP 20. For example, the terminal devices 10a to 10c are connected to the AP 20 via a wireless LAN and transmit frames to other terminal devices. The terminal devices 10d to 10f are connected to the network 50 via a wired LAN and transmit frames to other terminal devices.

  FIG. 2 is a diagram illustrating an example of a data structure of a frame. As shown in FIG. 2, this frame has a PHY (Physical) header, a first address, a second address, a third address, sequence control information, a fourth address, and data. Among these, the PHY header is a header having information on a physical connection format, and has information such as a conversion method, a bit rate, and reception timing. The sequence number is a serial number assigned to each frame. The data corresponds to user data.

  The first address to the fourth address store a MAC (Media Access Control) address of a terminal device serving as a frame destination and a MAC address of a terminal device serving as a frame transmission source. Which MAC address is stored in which address among the first to fourth addresses varies depending on the frame path.

  FIG. 3 is a diagram illustrating the relationship between the frame path and the MAC addresses stored in the first to fourth addresses. When the frame route is “terminal device (wireless) → AP 20 → terminal device (wireless)” as in the route identification information “1A”, the “MAC address of the destination terminal device” is stored in the first address. “MAC address of the transmission source terminal device” is stored in the second address, and “BSS (Basic Service Set) ID” is stored in the third address. The terminal device (wireless) corresponds to a device connected to the AP 20 by a wireless LAN, such as the terminal devices 10a to 10c in FIG.

  When the frame route is “terminal device (wired) → wired LAN → AP → terminal device (wireless)” as in the route identification information “1B”, the “MAC address of the destination terminal device” is stored in the first address. Then, “BSSID” is stored in the second address, and “MAC address of the transmission source terminal device” is stored in the third address. Note that the terminal device (wired) corresponds to a device connected to the network 50 by wire like the terminal devices 10d to 10f in FIG. The wired LAN corresponds to the network 50.

  When the frame path is “terminal device (wireless) → wired LAN → AP → terminal device (wired)” like the route identification information “1C”, “BSSID” is stored in the first address and the second address “MAC address of source terminal device” is stored in “3”, and “MAC address of destination terminal device” is stored in the third address.

  Like the route identification information “1D”, if the frame route is “terminal device (wired) → wired LAN → AP (1) → radio wave → AP (2) → wired LAN → terminal device (wired)” “MAC address of AP (2)” is stored in the first address, “MAC address of AP (1)” is stored in the second address, “MAC address of the destination terminal device” is stored in the third address, “MAC address of transmission source terminal device” is stored in 4 addresses. The radio wave corresponds to, for example, a radio wave transmitted and received between the APs 20a and 20b.

  On the wireless LAN, three types of frames, data frames, management frames, and control frames, flow. Data frames are frames that carry end-user data packets. The management frame is a frame for managing the connection between the terminal device 10 and the AP 20. The control frame is a frame for data packet flow control and delivery confirmation.

  For example, the transmission source device (terminal device 10 or AP 20) waits for a response (ACK) from the transmission destination device after transmitting the data frame to the transmission destination device (terminal device 10 or AP 20). When the destination device receives the data frame, it sends a response to the source device.

  Upon receiving the response, the source device transmits the next data frame with a higher bit rate modulation scheme. On the other hand, when the transmission source device does not receive a response, the transmission source device retries (retransmits) the next data frame with a modulation method with a lower bit rate. When retrying a data frame, the transmission source device stores information indicating that the data frame is a retransmission frame in the data frame.

  Basically, if the bit rate is high, the data transfer speed becomes high, but the modulation method becomes weak against noise, and retry is likely to occur. When the retry rate is large, the time until the frame transmitted by the transmission source device is received by the transmission destination device increases. As a result, end-to-end data transfer throughput decreases.

  In this embodiment, the data frame, the management frame, and the control frame are collectively referred to as a frame unless otherwise distinguished.

  Returning to the description of FIG. The AP 20 is a device that connects to the terminal device 10 via a wireless LAN and performs data communication. In the example illustrated in FIG. 1, the AP 20 is connected to the terminal devices 10a to 10c by a wireless LAN. For example, the terminal device 10a transmits a frame to another terminal device 10 via the AP 20.

  The measuring apparatus 100 receives a frame transmitted and received between the AP 20 and the terminal apparatus 10 via the wireless LAN, performs statistical processing based on the attribute information of the frame, and occupies the radio wave occupancy rate, bit rate, This is a device that creates and displays a visually recognizable graph such as a retry rate.

  FIG. 4 is a functional block diagram illustrating the configuration of the measurement apparatus according to the present embodiment. As illustrated in FIG. 4, the measurement apparatus 100 includes a frame acquisition unit 110, an input unit 120, a display unit 130, a storage unit 140, and a control unit 150.

  The frame acquisition unit 110 is a processing unit that acquires (captures) all frames transmitted and received through wireless LAN communication between the AP 20 and the terminal device 10. The frame acquisition unit 110 outputs the acquired frame to the registration unit 151.

  The input unit 120 is an input device that inputs various data to the control unit 150. For example, the input unit 120 corresponds to an input button, a touch panel, or the like. The display unit 130 is a display device that displays data output from the control unit 150. For example, the display unit 130 corresponds to a liquid crystal display, a touch panel, or the like.

  The storage unit 140 includes a frame storage table 141, an AP list 142, a terminal list 143, and a roaming table 144. The storage unit 140 corresponds to a storage device such as a semiconductor memory element such as a random access memory (RAM), a read only memory (ROM), and a flash memory.

  The frame storage table 141 is a table for storing frames acquired by the frame acquisition unit 110. FIG. 5 is a diagram illustrating an example of the data structure of the frame storage table. As shown in FIG. 5, the frame storage table 141 has a plurality of storage areas 30a, 30b, and 30c. In the example illustrated in FIG. 5, the storage areas 30 a to 30 c are illustrated, but the frame storage table 141 includes other storage areas. In the following description, the storage areas 30a to 30c are collectively referred to as a storage area 30 as appropriate.

  Each storage area 30 stores frames acquired by the frame acquisition unit 110 at different measurement slot times. For example, the storage area 30a stores the frame acquired by the frame acquisition unit 110 at a certain measurement slot time. The storage area 30b stores the frame acquired by the frame acquisition unit 110 in the measurement slot time next to the measurement slot time for the storage area 30a. The storage area 30c stores the frame acquired by the frame acquisition unit 110 in the measurement slot time next to the measurement slot time for the storage area 30b.

  For example, the measurement slot time is “15 minutes” and the start time is “9:00”. In this case, the storage area 30a stores the frames acquired by the frame acquisition unit 110 between “9: 0 to 9:15”. The storage area 30b stores the frames acquired by the frame acquisition unit 110 between “9:15 and 9:30”. The storage area 30c stores the frames acquired by the frame acquisition unit 110 between “9:30 to 9:45”.

  In each storage area 30, a frame and attribute information of this frame are stored in association with each other. The frame attribute information includes, for example, information on the bit rate of the corresponding frame and information on whether or not the corresponding frame is a retry frame.

  The AP list 142 includes information on MAC addresses of business APs, MAC addresses of public WiFi (Wireless Fidelity Registered Trademarks), and MAC addresses of other APs. FIG. 6 is a diagram illustrating an example of the data structure of the AP list. As shown in FIG. 6, this AP list 142 associates classification information, MAC addresses, AP names, SSID (Service Set Identifier), and channel information.

  In FIG. 6, the classification information is information indicating whether the corresponding AP is a business AP, a public WiFi AP, or another AP. When the classification information is “business use”, it indicates that the corresponding AP is a business use AP. When the classification information is “public WiFi”, it indicates that the corresponding AP is a public WiFi AP. When the classification condition is blank, it indicates that the corresponding AP is another AP.

  The MAC address indicates the MAC address of the corresponding AP. The AP name corresponds to the name of the corresponding AP. The SSID is an identifier of an access point. The channel information indicates a channel used by the corresponding AP. In the example of FIG. 6, the AP with the MAC address “a1: a2: a3: a4: a5” is “business”, the AP name is “AP-1”, the SSID is “yyyy”, and is used It is indicated that the channel to be played is 1ch.

  The terminal list 143 includes information on MAC addresses of business terminal devices and MAC addresses of other terminal devices. FIG. 7 is a diagram illustrating an example of a data structure of the terminal list. As illustrated in FIG. 7, the terminal list 143 associates the division information, the MAC address, and the SSID.

  In FIG. 7, the classification information is information indicating whether the corresponding terminal device is a business terminal device, a public WiFi terminal device, or another terminal device. The MAC address indicates the MAC address of the corresponding terminal device. The SSID corresponds to the SSID of the AP used by the terminal device. In the example of FIG. 7, the terminal device with the MAC address “p1: p2: p3: p4: p5” is “business” and the SSID is “yyyy”.

  The roaming table 144 is a table having information on the number of frames transmitted and received between the terminal device 10 and the AP 20. FIG. 8 is a diagram illustrating an example of the data structure of the roaming table. As shown in FIG. 8, in this roaming table, the number of frames transmitted and received between the terminal device 10 and the AP 20 is registered for each time zone.

  For example, in the time zone “10: 15-10: 30”, it is indicated that the number of frames transmitted and received by the terminal device 10a with the AP 20a is “127”. It is indicated that the number of frames transmitted / received between the terminal device 10a and the AP 20b is “114”.

  The control unit 150 includes a registration unit 151, a calculation unit 152, and a creation unit 153. The control unit 150 corresponds to an integrated device such as an application specific integrated circuit (ASIC) or a field programmable gate array (FPGA). The control unit 150 corresponds to an electronic circuit such as a CPU (Central Processing Unit) or an MPU (Micro Processing Unit).

  The registration unit 151 is a processing unit that registers the frame information captured by the frame information acquisition unit 110 in the frame storage table 141. The registration unit 151 registers frame information in the frame storage table 141 while switching the storage area of the frame storage table 141 serving as a registration destination for each measurement slot time. The engineer may set and change the measurement slot time as appropriate.

  For example, the registration unit 151 registers the frame information acquired by the frame acquisition unit 110 in the storage area 30a at a certain measurement slot time. The registration unit 151 registers the frame acquired by the frame acquisition unit 110 in the storage area 30b at the measurement slot time next to the measurement slot time for the storage area 30a. The registration unit 151 stores the frame acquired by the frame acquisition unit 110 in the storage area 30b at the measurement slot time next to the measurement slot time for the storage area 30b.

  Here, the frame acquisition unit 110 switches the reception channel at a sufficiently short time interval and acquires a frame flowing through the corresponding reception channel. For example, the frame acquisition unit 110 switches the reception channel at a time interval of 250 ms. For this reason, when the registration unit 151 registers the frame information in the corresponding storage area 30 in a certain measurement slot time, the storage area 30 stores the frame information of each channel.

  The calculation unit 152 performs statistical processing based on the frame and the frame attribute information stored in the frame storage table 141, so that the radio wave occupation rate, the average bit rate, the retry rate, the elapsed time of the number of devices, and the roaming It is a processing unit that calculates the passage of time and outputs the calculation result to the creation unit 153.

  Here, the calculation unit 152 calculates a radio wave occupation rate, an average bit rate, a retry rate, and the like for a frame transmitted and received between the business AP 20 and the business terminal device 10. However, the frames acquired by the frame acquisition unit 110 include frames transmitted and received by devices other than the business AP 20 and the business terminal device 10. Therefore, the calculation unit 152 specifies a frame transmitted / received by the business AP 20 using the MAC address stored in the AP list 142 as a key.

  In general, since the MAC address of the business AP 20 is clear at the time of designing the wireless LAN system, the AP list 142 can be set in the storage unit 140 in advance. On the other hand, regarding the MAC address of the terminal device 10, it is not easy to distinguish which terminal device 10 is for business use. This is because the terminal device 10 is constantly moving and the model is often changed. For this reason, for example, the calculation unit 152 identifies a terminal device used for business use as follows.

  The calculation unit 152 refers to the frame storage table 141 and determines whether the MAC address of the business AP 20 is included in any one of the first address to the fourth address of the frame. The MAC address of the business AP corresponds to the MAC address of the record whose classification information in the AP list 142 is “business”.

  The calculation unit 152 uses the MAC address of the destination terminal or the MAC address of the transmission source terminal device that is different from the MAC address of the business AP 20 included in the frame including the MAC address of the business AP 20 as the business terminal. Extracted as the MAC address of the device 10. The calculation unit 152 registers the extracted MAC address information of the business use terminal device 10 in the terminal list 143.

  Note that the types of information stored in the first address to the fourth address of the frame differ depending on the route as described with reference to FIG. The calculation unit 152 determines a route based on the presence / absence of the BBSID information of the AP 20 and the fourth address information, and extracts the MAC address information of the terminal device 10.

  Also, the calculation unit 152 automatically identifies whether or not the frame passes through the AP of the public wireless LAN, based on the SSID included in the frame. The calculation unit 152 updates the SSID of the AP list 142 as appropriate. In addition, the calculation unit 152 may update the information included in the AP list 142 and the terminal list 143 using any conventional technique.

  Hereinafter, processing in which the calculation unit 152 calculates the radio wave occupation rate, the bit rate, the retry rate, the time lapse of the number of devices, and the time lapse of roaming will be described in order.

  An example of processing in which the calculation unit 152 calculates the “radio wave occupation ratio” will be described. For example, the radio wave occupation ratio is defined by the equation (1). In equation (1), T1 corresponds to the time during which a frame is transmitted on the channel. T2 corresponds to the time when no frame is flowing on the channel. For this reason, the time obtained by adding T1 and T2 corresponds to the measurement slot time.

  Radio wave occupancy = T1 / (T1 + T2) (1)

  The calculation unit 152 can calculate T1 by adding the time required for each frame to be transmitted on the channel for all the frames on the same channel within the measurement slot time. The calculation unit 152 calculates the radio wave occupation ratio by dividing T1 by the measurement slot time (T2).

  The calculation unit 152 refers to each storage area 30 of the frame storage table 141 and calculates the radio wave occupancy rate in each channel at each time by executing the above-described processing for each channel at each measurement slot time.

  Next, an example of processing in which the calculation unit 152 calculates “average bit rate” will be described. The calculation unit 152 calculates the average bit rate of each terminal device 10 and each AP 20 in each time zone based on the bit rate of the attribute information of each frame stored in each storage area 30.

  An example of processing in which the calculation unit 152 calculates the average bit rate of the business AP 20 will be described. The calculation unit 152 refers to the AP list 142 and identifies one of the MAC addresses whose classification information is “business”. The calculation unit 152 compares the identified MAC address with the frame in the storage area 30a, extracts attribute information of the frame including the MAC address of the business AP 20, for example, and averages the bit rate of the extracted attribute information Calculate the value. When the calculation unit 152 executes such processing, the average bit rate of the business AP 20 in the measurement slot time corresponding to the storage area 30a is calculated. The calculation unit 152 calculates the average bit rate of the business AP 20 in other measurement slot times by executing the same processing for the storage areas 30b and 30c. The same applies when the calculation unit 152 calculates the average bit rate of other business APs and the average bit rate of public WiFi APs.

  An example of processing in which the calculation unit 152 calculates the average bit rate of the business terminal device 10 will be described. The calculation unit 152 refers to the terminal list 143 and identifies one of the MAC addresses whose classification information is “business”. The calculation unit 152 compares the identified MAC address with the frame in the storage area 30a, and extracts, for example, attribute information of the frame including the MAC address of the business terminal device 10, and the bit rate of the extracted attribute information The average value of is calculated. When the calculation unit 152 executes such processing, the average bit rate of the business terminal device 10 in the measurement slot time corresponding to the storage area 30a is calculated.

  In addition, the calculation unit 152 may calculate the average bit rate of frames transmitted and received between the specific AP 20 and the specific terminal device 10. The calculation unit 152 may calculate an average bit rate of a frame transmitted from the specific terminal device 10 to the specific AP 20. The calculation unit 152 may calculate an average bit rate of frames transmitted from the specific AP 20 to the specific terminal device 10.

  Next, an example of processing in which the calculation unit 152 calculates the “retry rate” will be described. The calculation unit 152 calculates the retry rate of each terminal device 10 and each AP 20 in each time zone based on the ratio of retransmission frames among the frames in the storage area 30.

  An example of processing in which the calculation unit 152 calculates the reception retry rate of the business AP 20 will be described. The calculation unit 152 refers to the AP list 142 and identifies one of the MAC addresses whose classification information is “business”. The calculation unit 152 compares the identified MAC address with the frame in the storage area 30a, and extracts, for example, a frame whose destination is the MAC address of the business AP 20. The calculation unit 152 calculates a reception retry rate by specifying a retransmission frame among the extracted frames and calculating a ratio of the retransmission frame to the extracted frame. The calculation unit 152 calculates the reception retry rate of the business AP 20 in other measurement slot times by executing the same processing for the storage areas 30b and 30c. The same applies to the case where the calculation unit 152 calculates the reception retry rate of the other business AP 20 and the reception retry rate of the public WiFi AP 20.

  An example of processing in which the calculation unit 152 calculates the transmission retry rate of the business AP 20 will be described. The calculation unit 152 refers to the AP list 142 and identifies one of the MAC addresses whose classification information is “business”. The calculation unit 152 compares the identified MAC address with the frame in the storage area 30a and extracts, for example, a frame whose transmission source is the MAC address of the business AP 20. The calculation unit 152 calculates a transmission retry rate by specifying a retransmission frame among the extracted frames and calculating a ratio of the retransmission frame to the extracted frame. The calculation unit 152 calculates the transmission retry rate of the business AP 20 in another measurement slot time by executing the same processing for the storage areas 30b and 30c. The same applies to the case where the calculation unit 152 calculates the transmission retry rate of another business AP 20 and the transmission retry rate of the public WiFi AP 20.

  An example of processing in which the calculation unit 152 calculates the reception retry rate of the business terminal device 10 will be described. The calculation unit 152 refers to the terminal list 143 and identifies one of the MAC addresses whose classification information is “business”. The calculation unit 152 compares the identified MAC address with the frame in the storage area 30a, and extracts, for example, a frame whose destination is the MAC address of the business terminal device 10. The calculation unit 152 calculates a reception retry rate by specifying a retransmission frame among the extracted frames and calculating a ratio of the retransmission frame to the extracted frame. The calculation unit 152 calculates the transmission retry rate of the business terminal device 10 in another measurement slot time by executing the same processing for the storage areas 30b and 30c. The same applies to the case where the calculation unit 152 calculates the transmission retry rate of another business terminal device 10.

  An example of processing in which the calculation unit 152 calculates the transmission retry rate of the business terminal device 10 will be described. The calculation unit 152 refers to the terminal list 143 and identifies one of the MAC addresses whose classification information is “business”. The calculation unit 152 compares the identified MAC address with the frame in the storage area 30a, and extracts, for example, a frame whose transmission source is the MAC address of the business terminal device 10. The calculation unit 152 calculates a transmission retry rate by specifying a retransmission frame among the extracted frames and calculating a ratio of the retransmission frame to the extracted frame. The calculation unit 152 calculates the transmission retry rate of the business terminal device 10 in another measurement slot time by executing the same processing for the storage areas 30b and 30c.

  Next, an example of a process in which the calculation unit 152 calculates “time elapse of the number of terminal devices 10 and APs 20” will be described. Based on the frame storage table 141, the AP list 142, and the terminal list 143, the calculation unit 152 determines the number of business APs 20 for each hour, the number of non-business APs 20, the number of business terminal devices 10, The number of terminal devices 10 is calculated.

  An example of processing in which the calculation unit 152 calculates the number of business APs 20 will be described. The calculation unit 152 refers to the AP list 142 and identifies one of the MAC addresses whose classification information is “business”. The calculation unit 152 compares the specified MAC address with the frame of the storage area 30a, and if the MAC address of the business AP 20 is included, adds 1 to the number of business APs 20. The calculation unit 152 counts the number of business APs 20 in the measurement slot time of the storage area 30a by executing the same process for other “business” MAC addresses. In addition, the calculation unit 152 calculates the number of business APs 20 in other measurement slot times by executing the same processing for the storage areas 30b and 30c.

  An example of processing in which the calculation unit 152 calculates the number of APs outside of work will be described. The calculation unit 152 refers to the AP list 142 and identifies one of the MAC addresses whose classification information is “public WiFi”. The calculation unit 152 compares the specified MAC address with the frame in the storage area 30a, and adds 1 to the number of public WiFi APs 20 if the MAC address of the public WiFi AP 20 is included. The calculation unit 152 counts the number of public WiFi APs 20 in the measurement slot time of the storage area 30a by performing the same process for the other MAC addresses that are “public WiFi”. In addition, the calculation unit 152 calculates the number of public WiFi APs 20 in other measurement slot times by performing the same processing on the storage areas 30b and 30c.

  The calculation unit 152 refers to the AP list 142 and identifies one of the MAC addresses of other APs 20 whose classification information is “blank”. The calculation unit 152 compares the identified MAC address with the frame in the storage area 30a, and adds 1 to the number of other APs 20 if the MAC address of the other AP 20 is included. The calculation unit 152 performs the same process for other “blank” MAC addresses, thereby counting the number of other APs 20 in the measurement slot time of the storage area 30a. In addition, the calculation unit 152 calculates the number of other APs 20 in other measurement slot times by executing the same processing on the storage areas 30b and 30c.

  An example of processing in which the calculation unit 152 calculates the number of business terminal devices 10 will be described. The calculation unit 152 refers to the terminal list 143 and identifies one of the MAC addresses whose classification information is “business”. The calculation unit 152 compares the specified MAC address with the frame of the storage area 30a, and if the MAC address of the business terminal device 10 is included, adds 1 to the number of business terminal devices 10 To do. The calculation unit 152 counts the number of business-use terminal devices 10 in the measurement slot time of the storage area 30a by executing the same process for other “business-use” MAC addresses. Also, the calculation unit 152 calculates the number of business terminal devices 10 in other measurement slot times by executing the same processing for the storage areas 30b and 30c.

  An example of processing in which the calculation unit 152 calculates the number of terminal devices outside business will be described. The calculation unit 152 refers to the terminal list 143 and identifies one of the MAC addresses whose classification information is “public WiFi”. The calculation unit 152 compares the identified MAC address with the frame in the storage area 30a, and if the MAC address of the public WiFi terminal device 10 is included, adds 1 to the number of public WiFi terminal devices 10 To do. The calculation unit 152 counts the number of the public WiFi terminal devices 10 in the measurement slot time of the storage area 30a by executing the same process for the other “public WiFi” MAC addresses. In addition, the calculation unit 152 calculates the number of public WiFi terminal devices 10 in other measurement slot times by performing the same processing on the storage areas 30b and 30c.

  The calculation unit 152 refers to the terminal list 143 and identifies one of the MAC addresses of the other terminal devices 10 whose classification information is “blank”. The calculation unit 152 compares the identified MAC address with the frame in the storage area 30a, and adds 1 to the number of other terminal devices 10 if the MAC address of the other terminal device 10 is included. The calculation unit 152 counts the number of other terminal apparatuses 10 in the measurement slot time of the storage area 30a by executing the same process for other “blank” MAC addresses. In addition, the calculation unit 152 calculates the number of other terminal apparatuses 10 in other measurement slot times by executing the same processing for the storage areas 30b and 30c.

  Next, an example of processing in which the calculation unit 152 calculates “roaming time elapsed” will be described. When a plurality of business APs 20 are set on the same floor and roaming is performed, the business terminal device 10 communicates by connecting to the AP 20 having the highest radio wave intensity. When the business terminal device 10 moves, the terminal device 10 switches the business AP 20 to be connected. Further, when it is determined that the radio waves of any business AP 20 are not sufficient as viewed from the terminal device 10, the switching operation of the business AP 20 to be connected is repeatedly executed. The calculation unit 152 calculates the number of frames transmitted and received with which AP 20 by the business terminal device 10 by executing the following processing.

  The calculation unit 152 refers to the AP list 122 and selects a certain business AP 20. For convenience of explanation, the AP 20 selected by the calculation unit 152 is represented as “APn”. The calculation unit 152 refers to the storage area 30a and extracts a frame whose destination or transmission source is APn. For the frame extracted by the calculation unit 152, the MAC address paired with the MAC address of APn becomes the business terminal device 10 connected to APn. The calculation unit 152 updates the roaming table 144 by adding 1 to the number of frames transmitted and received between APn and the terminal device 10 connected to the APn in the measurement slot time corresponding to the storage area 30a. . The calculation unit 152 updates the roaming table 144 by performing the same process for the other APn. Further, the calculation unit 152 performs the same process on the storage areas 30b and 30c, thereby calculating the number of frames transmitted and received between the APn and the business terminal device 10 in other measurement slot times. Calculate and update the roaming table 144.

  The calculation unit 152 calculates the radio wave occupation rate, the average bit rate, the retry rate, the time lapse of the number of devices, and the time lapse of roaming by executing the above processing, and outputs the calculation result to the creation unit 153.

  The creation unit 153 is a processing unit that generates a graph regarding the radio wave occupancy rate, the average bit rate, the retry rate, the time lapse of the number of devices, and the roaming time lapse based on the calculation result acquired from the calculation unit 152. The creation unit 153 causes the display unit 130 to display information about each created graph. Hereinafter, an example of each graph created by the creation unit 153 will be described.

  An example of a radio wave occupation ratio graph created by the creation unit 153 will be described. FIG. 9 is a diagram illustrating an example of a graph of radio wave occupation ratio. The creation unit 153 creates the graph shown in FIG. 9 based on the calculation result of the radio wave occupation ratio. In the graph shown in FIG. 9, the vertical axis is an axis corresponding to the radio wave occupation ratio, and the horizontal axis is an axis corresponding to the channel. The creation unit 153 may represent the radio wave occupancy rate of each time zone in the same channel by associating the color of the bar of the graph with the time zone.

  An example of an average bit rate graph created by the creation unit 153 will be described. 10 and 11 are diagrams illustrating examples of average bit rate graphs. The creation unit 153 creates the graphs shown in FIGS. 10 and 11 based on the calculation result of the average bit rate.

  FIG. 10 shows an example of the average bit rate of frames transmitted by the AP 20. In the graph shown in FIG. 10, the vertical axis is an axis corresponding to the ratio of the corresponding bit rate (rate of speed) among all the bit rates. The horizontal axis is an axis corresponding to the bit rate. For example, the creation unit 153 may represent the ratio of each time slot at the same bit rate by associating the color of the bar of the graph with each time slot.

  FIG. 11 shows an example of the average bit rate of frames transmitted by the terminal device 10. In the graph shown in FIG. 11, the vertical axis is the axis corresponding to the ratio (rate of speed) of the corresponding bit rate among all the bit rates. The horizontal axis is an axis corresponding to the bit rate. For example, the creation unit 153 may represent the ratio of each time pair at the same bit rate by associating the color of the bar of the graph with each time zone.

  An example of a retry rate graph created by the creation unit 153 will be described. 12 and 13 are diagrams illustrating examples of retry rate graphs. The creation unit 153 creates the graphs of FIGS. 12 and 13 based on the calculation result of the retry rate. In FIG. 12 and FIG. 13, for convenience of explanation, the average bit rate and the retry rate are shown together.

  FIG. 12 shows the average bit rate and retry rate of the AP 20 together. The vertical axis on the left is an axis corresponding to the average bit rate. The vertical axis on the right is the axis corresponding to the retry rate. The horizontal axis is an axis corresponding to the time zone. A colored bar indicates the reception retry rate of the AP 20. The colored bars indicate the transmission retry rate of the AP 20. A solid line indicates the reception bit rate of the AP 20. A broken line indicates the transmission bit rate of the AP 20.

  FIG. 13 shows the average bit rate and retry rate of the terminal device 10 together. The vertical axis on the left is an axis corresponding to the average bit rate. The vertical axis on the right is the axis corresponding to the retry rate. The horizontal axis is an axis corresponding to the time zone. A colored bar indicates the reception retry rate of the terminal device 10. The colored bar indicates the transmission retry rate of the terminal device 10. A solid line indicates the reception bit rate of the terminal device 10. A broken line indicates the transmission bit rate of the terminal device 10.

  An example of a graph of the elapsed time of the number of devices created by the creation unit 153 will be described. FIG. 14 and FIG. 15 are diagrams illustrating an example of a graph of the elapsed time of the number of devices. The creation unit 153 creates the graphs illustrated in FIGS. 14 and 15 based on the calculation result of the elapsed time of the number of devices.

  FIG. 14 shows the passage of time of the number of APs 20. The vertical axis is an axis corresponding to the number of APs 20. The horizontal axis is an axis corresponding to the time zone. In the graph shown in FIG. 14, the number of other APs 20, the number of public WiFi APs 20, and the number of business APs 20 are indicated by the color of the bars. For example, the uncolored portion corresponds to the number of other APs 20. The shaded portion corresponds to the number of public WiFi APs 20. The colored portion corresponds to the number of business APs 20.

  FIG. 15 shows the passage of time of the number of terminal devices 10. The vertical axis is an axis corresponding to the number of terminal devices 10. The horizontal axis is an axis corresponding to the time zone. In the graph shown in FIG. 15, the number of other terminal devices 10, the number of public WiFi terminal devices 10, and the number of business terminal devices 10 are indicated by the color of the bars. For example, the uncolored portion corresponds to the number of other terminal devices 10. The hatched portion corresponds to the number of public WiFi terminal devices 10. The colored portion corresponds to the number of business APs 20.

  Next, an example of a roaming time lapse graph created by the creation unit 153 will be described. FIG. 16 is a diagram illustrating an example of a roaming time lapse graph. The creation unit 153 creates the graph shown in FIG. 16 based on the calculation result of the roaming time passage.

  For example, FIG. 16 shows the ratio of the number of frames transmitted and received by the terminal device 10a with each AP 20. The vertical axis is an axis corresponding to the ratio. The horizontal axis is an axis corresponding to the time zone. In the graph shown in FIG. 16, the ratio with each AP 20 is indicated by the color of the bar. For example, the uncolored portion indicates the ratio of the number of frames transmitted / received between the terminal device 10a and the AP 20a. The colored portion indicates the ratio of the number of frames transmitted / received between the terminal device 10a and the AP 20b. The hatched portion indicates the ratio of the number of frames transmitted / received between the terminal device 10a and the AP 20c. In FIG. 16, as an example, the time elapse of roaming between the terminal device 10a and each AP 20 is shown. The creation unit 153 creates a gram of roaming time between the other terminal devices 10 and each AP 20 in the same manner.

  Next, an example of a processing procedure of the measuring apparatus 100 according to the present embodiment will be described. FIG. 17 is a flowchart illustrating an example of a processing procedure of the measurement apparatus according to the present embodiment. As shown in FIG. 17, the measuring apparatus 100 acquires a frame transmitted / received between the terminal apparatus 10 and the AP 20 on the wireless LAN (step S101).

  The measuring apparatus 100 stores the frame in the storage area of the frame storage table 141 for each measurement slot time (step S102). The measuring apparatus 100 calculates a radio wave occupation rate (step S103). The measuring apparatus 100 calculates an average bit rate (step S104).

  The measuring apparatus 100 calculates a retry rate (step S105). The measuring apparatus 100 calculates the elapsed time of the number of appearances of the device (step S106). The measuring apparatus 100 calculates the elapsed time of roaming (step S107).

  The measuring apparatus 100 creates a graph (step S108). For example, in step S108, the measuring apparatus 100 creates a graph of radio wave occupation rate, average bit rate, retry rate, time lapse of the number of devices, and roaming time lapse.

  The measuring apparatus 100 displays a graph (step S109). For example, in step S109, the measurement apparatus 100 displays a graph of radio wave occupancy, average bit rate, retry rate, number of devices over time, and roaming over time.

  Next, the effect of the measuring apparatus 100 according to the present embodiment will be described. The measuring apparatus 100 calculates the radio wave occupancy rate, the average bit rate, and the frame retry rate for each time based on the attributes of the frames transmitted and received by the wireless LAN communication between the AP 20 and the terminal device 10, and calculates Create a graph based on the results. For example, the state that the communication quality of the wireless LAN is low appears in the radio wave occupation rate, the average bit rate, and the retry rate, for example, regardless of the cause. For this reason, the measurement part 100 can evaluate the communication quality of wireless LAN efficiently by producing the graph of time passage of a radio wave occupation rate, an average bit rate, and a retry rate.

  The measuring apparatus 100 calculates a radio wave occupation rate, a bit rate, and a retry rate based on the attribute information of the frames obtained by dividing each measurement slot time. For this reason, the radio wave occupation rate, bit rate, and retry rate can be calculated with high accuracy.

  For example, the measurement device 100 acquires a frame transmitted / received by wireless communication between a predetermined AP 20 and the terminal device 10 based on, for example, the MAC address of a business access point. For this reason, for example, an average bit rate and a retry rate can be calculated for a frame exchanged between the target AP 20 and the terminal device 10.

  The measuring device 100 calculates the number of terminal devices 10 at each time of connection to a predetermined AP 20 based on the frame attribute information, and creates a graph. For this reason, it is possible to easily grasp how many terminal devices 10 exist in the wireless LAN to be investigated.

  Based on the attribute information of a plurality of frames, the measuring apparatus 100 identifies a predetermined access point for each time as a connection destination of a predetermined terminal apparatus, and creates a graph. For this reason, it is possible to easily grasp with which AP 20 the target terminal device 10 is exchanging frames.

  By the way, among the processes described in the present embodiment, all or a part of the processes described as being automatically performed can be manually performed, or the processes described as being performed manually can be performed. All or a part can be automatically performed by a known method. In addition, the processing procedure, control procedure, specific name, and information including various data and parameters shown in the above-described document and drawings can be arbitrarily changed unless otherwise specified.

  Furthermore, each processing function performed by each device may be realized by a CPU and a program that is analyzed and executed by the CPU, or may be realized as hardware by wired logic.

10a, 10b, 10c, 10d, 10e, 10f Terminal device 20a, 20b, 20c, 20d AP
50 Network 100 Measuring device

Claims (4)

Based on identification information of a predetermined access point, an acquisition unit that acquires a frame transmitted and received by wireless communication between the predetermined access point and a terminal device;
Based on the attribute information of the plurality of frames acquired by the acquisition unit, the radio wave occupation rate of each channel used in the wireless communication, the bit rate of the frame, the retry rate of the frame, and the predetermined access A calculation unit that calculates the number of terminal devices connected to the point for each time;
Based on the calculation result of the calculation unit, a graph showing the relationship between the time and the radio wave occupancy rate for each channel, a graph showing the relationship between the time and the bit rate of the frame, and the relationship between the time and the retry rate of the frame And a creation unit that creates a graph indicating the relationship between time and the number of terminal devices.   The acquisition unit acquires the frame divided at regular time intervals, and the calculation unit acquires the radio wave occupancy rate, the bit rate, and the frame rate based on the attribute information of the frames acquired at regular time intervals. The measuring apparatus according to claim 1, wherein the retry rate is calculated. The calculation unit identifies a predetermined access point for each time as a connection destination of a predetermined terminal device based on attribute information of a plurality of frames acquired by the acquisition unit, and the creation unit determines the time and the predetermined The measuring apparatus according to claim 2 , wherein a graph indicating a relationship with a connection destination access point of the terminal device is created. A measurement method performed by a computer,
Based on the identification information of the predetermined access point, obtain a frame transmitted and received by wireless communication between the predetermined access point and the terminal device,
Based on the acquired attribute information of a plurality of frames, the radio wave occupancy rate of each channel used in the wireless communication, the bit rate of the frame, the retry rate of the frame, and a connection to the predetermined access point Calculate the number of terminal devices for each time,
Based on the calculation results, a graph showing the relationship between the time and the radio wave occupation rate for each channel, a graph showing the relationship between the time and the bit rate of the frame, and a graph showing the relationship between the time and the retry rate of the frame A method for creating a graph indicating a relationship between time and the number of terminal devices is executed.

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