JP6951172B2 - Wireless communication system, communication device and data integration method - Google Patents

Description

Embodiments of the present invention relate to wireless communication systems, communication devices and data integration methods.

In recent years, in an integrated building management system in buildings such as office buildings, hotels, factories, and commercial facilities, networking by wireless communication method has been considered and introduction has begun. In a general wireless communication system, it is desirable to introduce a multi-hop wireless network capable of relay transmission in order to provide a wide communication range. In order to manage a wireless communication network having a wide communication range, a sniffer device that captures radio waves and performs packet analysis is required. It is difficult to capture the entire wireless communication network with a wide communication range with a single sniffer device. Therefore, a method of capturing the entire wireless communication network by using a plurality of sniffer devices can be considered. However, since the clock accuracy of each sniffer device is different, the time axis is different for each sniffer device. Therefore, there are cases where a means for integrating the data by aligning the time axis of the captured data is required.

Special Table 2014-504112 Japanese Unexamined Patent Publication No. 2008-141777 Japanese Unexamined Patent Publication No. 2005-223906

An object to be solved by the present invention is to provide a wireless communication system, a communication device, and a data integration method capable of integrating a plurality of sniffer data.

The wireless communication system of the embodiment has a plurality of first communication devices and a second communication device. The first communication device has a communication unit and a sniffer data generation unit. The communication unit acquires packets propagating in space. The sniffer data generation unit assigns the time when the packet was acquired to the packet, and generates sniffer data including the packet and indicating the operating status of the network. The second communication device has a master determination unit, a time correction unit, and a sniffer data integration unit. The master determination unit determines the first communication device that emits a clock signal as a reference for correcting the time given to the packet among the first communication devices as the master device. The time correction unit identifies the packet that is commonly included in the sniffer data generated by the master device and the sniffer data generated by the other first communication device, and sets the packet in the other first communication device. By performing a predetermined process on the given time, the time given to the packet of the other first communication device is corrected to the time determined by the clock signal. The sniffer data integration unit generates integrated sniffer data including sniffer data generated by the master device and sniffer data generated by the other first communication device. The master determination unit determines the first communication device whose information indicating the accuracy of the clock signal emitted by the first communication device satisfies a predetermined condition as the master device.

The system block diagram of the wireless communication system 1 of 1st Embodiment. The functional block diagram of the sniffer device 100 of 1st Embodiment. The functional block diagram of the integrated apparatus 200 of 1st Embodiment. The functional block diagram of the wireless terminal 300 of 1st Embodiment. The figure which shows the example which calculates the packet interval of 1st Embodiment. The figure which shows the example of the process which corrects the time axis of the sniffer data of 1st Embodiment. The figure which shows a specific example of the generation of the integrated sniffer data of 1st Embodiment. The figure which shows a specific example of the calculation method of the clock error of 1st Embodiment. The figure which shows one specific example of the determination method of the master apparatus of 1st Embodiment. The flowchart which shows the flow of the time correction processing of 1st Embodiment. The flowchart which shows the flow of process of determination of the master apparatus of 1st Embodiment. The sequence diagram which shows the flow of the process of generating the integrated sniffer data of 1st Embodiment. The system configuration diagram of the wireless communication system 1 of the second embodiment. The functional block diagram of the sniffer device 110 of the 2nd Embodiment. The functional block diagram of the integrated apparatus 210 of the 2nd Embodiment. The system configuration diagram of the wireless communication system 3 of the third embodiment. The functional block diagram of the sniffer device 120 of the 3rd Embodiment. The functional block diagram of the sniffer device 130 of the third embodiment.

Hereinafter, the wireless communication system, the communication device, and the data integration method of the embodiment will be described with reference to the drawings.

(First Embodiment)
FIG. 1 is a system configuration diagram of the wireless communication system 1 of the first embodiment. The wireless communication system 1 is composed of a multi-hop type wireless network including a plurality of wireless terminals. The wireless communication system 1 generates integrated sniffer data. The integrated sniffer data is data indicating the operating status of the wireless communication system 1. The integrated sniffer data is data that includes sniffer data generated by the sniffer device. The wireless communication system 1 includes a sniffer device 100a, a sniffer device 100b, an integrated device 200, and wireless terminals 300a to i. In the wireless communication system 1 of FIG. 1, the wireless terminals 300a to 300c, the wireless terminals d to f, and the wireless terminals g to i directly perform wireless communication, respectively. Communication between wireless terminals that cannot directly communicate with each other, such as the wireless terminal 300a and the wireless terminal 300d, is realized by relaying the wireless terminal 300b or the wireless terminal 300c as a relay point. Hereinafter, when it is not distinguished which sniffer device it is, it will be described simply as the sniffer device 100. Hereinafter, when it is not distinguished which wireless terminal it is, it will be simply referred to as a wireless terminal 300.

The sniffer device 100a and the sniffer device 100b each have a region 400a and a region 400b as a range in which packets can be acquired. The sniffer device 100 is geographically distributed to acquire the radio packet of the entire wireless communication system 1. The sniffer device 100a and the sniffer device 100b are arranged so that there is at least one wireless terminal 300 capable of acquiring packets in common. For example, in the case of FIG. 1, it is a wireless terminal 300e. The sniffer device 100a and the sniffer device 100b generate sniffer data, respectively. The integration device 200 generates integrated sniffer data by integrating the sniffer data received from each sniffer device 100. By confirming the integrated sniffer data, the user grasps the communication status of the wireless communication system 1 composed of the wireless terminal 300. The user may be, for example, a person who operates the wireless communication system 1.

FIG. 2 is a functional block diagram of the sniffer device 100 of the first embodiment. The sniffer device 100 is an information processing device having a communication function such as a personal computer, a smartphone, a tablet computer, or a handy terminal. The sniffer device 100 includes a processor, a memory, an auxiliary storage device, and the like connected by a bus. The sniffer device 100 acquires packets that can be acquired by its own device among the communications between the wireless terminals 300. The sniffer device 100 generates sniffer data based on the acquired packet. The sniffer data is data indicating the operating status of the wireless terminal 300. The sniffer device 100 transmits the generated sniffer data to the integrated device 200. By executing the packet acquisition program, the sniffer device 100 functions as a device including the first communication unit 101, the second communication unit 102, the sniffer data storage unit 103, the integrated device information storage unit 104, and the control unit 105. The sniffer device is an aspect of the first communication device.

The first communication unit 101 is a network interface. The first communication unit 101 receives a packet propagating in space. The first communication unit 101 receives a packet transmitted from the wireless terminal 300 to a destination other than its own device. The first communication unit 101 communicates by a communication method such as wireless LAN (Local Area Network), Bluetooth (registered trademark), LTE (Long Term Evolution) (registered trademark), DSRC (Dedicated Short Range Communications) or STD-T108. You may.

The second communication unit 102 is a network interface. The second communication unit 102 communicates with the integrated device 200. The second communication unit 102 may communicate by a communication method such as a wireless LAN, a wired LAN, or LTE.

The sniffer data storage unit 103 is configured by using a storage device such as a magnetic hard disk device or a semiconductor storage device. The sniffer data storage unit 103 stores sniffer data. The sniffer data includes a source radio terminal identifier, a destination radio terminal identifier, a message type, a sequence number, a time stamp or payload information. The information included in the sniffer data may include information that differs depending on the communication protocol used by the wireless terminal 300.

The integrated device information storage unit 104 is configured by using a storage device such as a magnetic hard disk device or a semiconductor storage device. The integrated device information storage unit 104 stores the integrated device information. The integrated device information is information required for communicating with the integrated device 200. The integrated device information includes the integrated device identification information of the integrated device 200 and the integrated device communication information for communicating with the integrated device 200. The integrated device identification information is information that identifies the integrated device 200 on the network. The integrated device identification information is, for example, information such as an IP address and a MAC address. The integrated device communication information is information required for communicating with the integrated device 200. The integrated device communication information is, for example, information such as a communication protocol or a communication band.

The control unit 105 controls the operation of each unit of the sniffer device 100. The control unit 105 is executed by a device including, for example, a processor and a RAM (Random Access Memory). By executing the packet acquisition program, the control unit 105 functions as a sniffer data generation unit 106, a time measurement unit 107, a sniffer data transmission control unit 108, and an integrated device registration unit 109.

The sniffer data generation unit 106 generates sniffer data based on the acquired packet. The sniffer data generation unit 106 generates a time stamp indicating a packet reception time based on the time information of the own device. The sniffer data generation unit 106 generates sniffer data by adding a time stamp to the packet. The sniffer data generation unit 106 stores the generated sniffer data in the sniffer data storage unit 103. The time information may be the time of the clock built in the sniffer device 100, the time acquired from the NTP (Network Time Protocol) server, or the UNIX (registered trademark) time. However, it may be ICMP Timestamp or any time. As the time stamp, the time information may be used as it is, or information processed by a hash function, a digital signature, or the like may be used for the time information.

The time measuring unit 107 measures the time according to the packet acquisition duration received from the integrated device 200. The packet acquisition duration is time information representing the time for the sniffer device 100 to acquire a packet. The packet acquisition duration is determined according to the timing at which the integrated sniffer data is generated by the integrated device 200. When the packet acquisition duration is, for example, 10 seconds, the time measuring unit 107 measures 10 seconds. The sniffer device 100 acquires packets while the time measuring unit 107 is measuring the time. When the time corresponding to the packet acquisition duration elapses, the time measurement unit 107 outputs a notification to the sniffer data generation unit 106 that the packet acquisition duration has timed out. The sniffer data generation unit 106 generates sniffer data when it receives a notification from the time measurement unit 107 that the packet acquisition duration has timed out.

The sniffer data transmission control unit 108 transmits the generated sniffer data to the integrated device 200 via the second communication unit 102. When transmitting sniffer data, the sniffer data transmission control unit 108 transmits sniffer data based on the integrated device information stored in the integrated device information storage unit 104.

The integrated device registration unit 109 transmits sniffer information of its own device to the integrated device 200. The sniffer information includes sniffer identification information of the own device, sniffer communication information for communicating with the own device, and clock information of the own device. The sniffer identification information is information that identifies the sniffer device 100 on the network. The sniffer identification information is, for example, information such as an IP address and a MAC address. The sniffer communication information is information required for communicating with the sniffer device 100. The sniffer communication information is, for example, information such as a communication protocol or a communication band. The clock information is information indicating the accuracy of a clock signal such as PPM (Parts Per Million).

FIG. 3 is a functional block diagram of the integrated device 200 of the first embodiment. The integrated device 200 is an information processing device having a communication function such as a personal computer, a workstation, a server, or an industrial computer. The integrated device 200 includes a processor, a memory, an auxiliary storage device, and the like connected by a bus. The integrated device 200 receives sniffer data from the sniffer device 100. The integration device 200 generates integrated sniffer data by integrating a plurality of sniffer data. By executing the sniffer data integration program, the integration device 200 functions as a device including a communication unit 201, a sniffer data storage unit 202, a sniffer information storage unit 203, and a control unit 204. The integrated device is one aspect of the second communication device.

The communication unit 201 is a network interface. The communication unit 201 communicates with the sniffer device 100. The communication unit 201 may communicate by a communication method such as a wireless LAN, a wired LAN, or LTE.

The sniffer data storage unit 202 is configured by using a storage device such as a magnetic hard disk device or a semiconductor storage device. The sniffer data storage unit 202 stores the sniffer data received from the sniffer device 100 and the integrated sniffer data.

The sniffer information storage unit 203 is configured by using a storage device such as a magnetic hard disk device or a semiconductor storage device. The sniffer information storage unit 203 stores sniffer information about the sniffer device 100 with which the integrated device 200 can communicate.

The control unit 204 controls the operation of each unit of the integrated device 200. The control unit 204 is executed by a device including, for example, a processor and RAM. By executing the sniffer data integration program, the control unit 204 functions as a time correction unit 205, a sniffer data integration unit 206, a master determination unit 207, and a sniffer registration unit 208.

The time correction unit 205 corrects the time axis included in the sniffer data to the integrated time axis. The time axis represents the time determined by the clock signal of the sniffer device 100. The time axis differs depending on the sniffer device 100. The integrated time axis represents the time axis of the integrated sniffer data. The time axis of the sniffer data included in the integrated sniffer data is corrected to the integrated time axis. As the integrated time axis, for example, the time axis of the master device is used. The master device may be the sniffer device having the highest clock accuracy among the sniffer devices 100 in the wireless communication system 1. The sniffer device 100 other than the master device is used as the slave device. The master device is determined by the master determination unit 207.

The time correction unit 205 corrects other packets on the integrated time axis with the offset packet as a reference. The offset packet is the same packet that is commonly included in the sniffer data of two or more sniffer devices 100. Of the two or more sniffer devices 100, one is a master device. The time correction unit 205 analyzes the packet message and detects the packet having the same parameters as an offset packet. The parameter is information included in sniffer data such as a source radio terminal identifier, a destination radio terminal identifier, a message type, a sequence number, a time stamp, or a payload information. The time correction unit 205 may determine whether or not the packets match in bit units, and may detect packets having the same bit values as offset packets. The time correction unit 205 detects two or more offset packets from each sniffer device 100 and calculates the offset packet interval (hereinafter referred to as “packet interval”).

FIG. 5 is a diagram showing an example of calculating the packet interval of the first embodiment. In FIG. 5, the offset packet and the packet interval of the sniffer device 100a and the sniffer device 100b are determined. The time correction unit 205 detects the same packet that is commonly included in the sniffer data of the sniffer device 100a and the sniffer data of the sniffer device 100b. According to FIG. 5, packet A1 and packet B1 are the same packet. The time correction unit 205 detects the packet A1 and the packet B1 as the offset packet 10. According to FIG. 5, packet A2 and packet B2 are the same packet. The time correction unit 205 detects the packet A2 and the packet B2 as the offset packet 20. Here, the time correction unit 205 calculates the difference between the reception time of the packet A1 and the reception time of the packet A2 as the packet interval TA. The time correction unit 205 calculates the difference between the reception time of the packet B1 and the reception time of the packet B2 as the packet interval TB.

Returning to FIG. 3, the description of the time correction unit 205 will be continued. The time correction unit 205 corrects the time axis of the sniffer data of the slave device to the integrated time axis by performing a predetermined process on the sniffer data of the slave device.

FIG. 6 is a diagram showing an example of processing for correcting the time axis of the sniffer data of the first embodiment. In FIG. 6, the sniffer device 100a will be described as a master device, and the sniffer device 100b will be described as a slave device. The process shown in FIG. 6 is executed after the offset packets 10 and 20 of the sniffer device 100a and the sniffer device 100b and the packet intervals TA and TB are determined. The time correction unit 205 calculates the compression rate based on the packet interval. The compression rate is a value calculated with the numerator as the packet interval of the master device and the denominator as the packet interval of the slave device. The compression ratio represents the ratio of the packet intervals of offset packets between the sniffer devices 100. The time correction unit 205 corrects the time by multiplying the compression rate by the reception time of the packet of the slave device.

For example, in FIG. 6, the time correction unit 205 calculates the compression rate TA / TB. The time correction unit 205 corrects the time by multiplying the reception time of each packet of the sniffer device 100b by the compression rate. The sniffer data integration unit 206 calculates the packet B1 correction time by multiplying the packet B1 reception time by the compression rate. The packet B1 correction time coincides with the packet A1 reception time. The time correction unit 205 calculates the packet B2 correction time by multiplying the packet B2 reception time by the compression rate. The packet B2 correction time coincides with the packet A2 reception time. In this way, the time correction unit 205 corrects the packet reception time of the sniffer data of the sniffer device 100b.

Returning to FIG. 3, the description of the integrated device 200 will be continued. The sniffer data integration unit 206 generates integrated sniffer data. The sniffer data integration unit 206 includes each sniffer data in the sniffer data represented by the integration time axis to form one sniffer data to generate integrated sniffer data.

FIG. 7 is a diagram showing a specific example of generating integrated sniffer data according to the first embodiment. In FIG. 7, the sniffer device 100a will be described as a master device, and the sniffer device 100b will be described as a slave device. The reception time of the packet of the sniffer device 100b is time-corrected by the time correction unit 205. Therefore, the time axes of the sniffer device 100a and the sniffer device 100b coincide with each other. According to FIG. 7, the sniffer data of the sniffer device 100a includes packets A1-1 and packets A1-2 between the reception times of the offset packets 10 and 20. According to FIG. 7, the sniffer data of the sniffer device 100b includes packets B1-1 and packets B1-2 between the reception times of the offset packets 10 and 20.

The sniffer data integration unit 206 includes the reception times of packets A1 and packets A2, which are offset packets, in the integrated sniffer data. The sniffer data integration unit 206 includes packets A1-1, A1-2, B1-1 and B1-2 included between the offset packet 10 and the offset packet 20 in the integrated sniffer data in the order of reception time or correction time. .. The sniffer data integration unit 206 deletes packets (for example, packets B1 and B2) that are regarded as the same by the sniffer device 100a and the sniffer device 100b. In this way, the sniffer data integration unit 206 generates integrated sniffer data by integrating the sniffer data received from the plurality of sniffer devices 100 on one time axis. The sniffer data integration unit 206 may generate integrated sniffer data for three or more sniffer data by repeating the integration of the integrated sniffer data and other sniffer data.

When the sniffer data integration unit 206 generates the integrated sniffer data, the sniffer data integration unit 206 transmits a sniffer registration response message including a packet acquisition duration to the sniffer device 100.

Returning to FIG. 3, the description of the integrated device 200 will be continued. The master determination unit 207 determines the sniffer device 100 having high clock signal accuracy among the sniffer devices 100 as the master device. The master determination unit 207 determines the master device by performing a predetermined process on the acquired sniffer data. Specifically, the master determination unit 207 determines a reference device as a candidate for the master device. The time axis of the reference device is a time axis that serves as a reference for correcting the time axis of the other sniffer device 100. The master determination unit 207 calculates an evaluation value of the clock error between the reference device and all other sniffer devices 100. The evaluation value of the clock error is a value obtained by accumulating the clock error between the reception time and the correction time of the offset packet. Specifically, the master determination unit 207 calculates the clock error Δt between the offset packet and the correction time for each combination of offset packets. The master determination unit 207 uses the sum of each clock error Δt as the evaluation value of the clock error. The master determination unit 207 may determine that the smaller the variance value of the clock error Δt, the larger the evaluation value of the clock error.

FIG. 8 is a diagram showing a specific example of the clock error calculation method of the first embodiment. In FIG. 8, the sniffer device 100a will be described as a reference device. The time correction unit 205 detects a plurality of offset packets with respect to the sniffer data of the sniffer device 100a and the sniffer data of the sniffer device 100b. The time correction unit 205 calculates the compression rate based on the offset packet. The time correction unit 205 corrects the time by multiplying the reception time of the sniffer data of the sniffer device 100b by a compression rate. The master determination unit 207 calculates the time difference between the offset packets. For example, the master determination unit 207 calculates ΔB1 which is the difference between the packet A2 reception time and the packet B2 correction time. Similarly, the master determination unit 207 calculates ΔB2, which is the difference between the packet A3 reception time and the packet B3 correction time. The master determination unit 207 calculates ΔB3, which is the difference between the packet A4 reception time and the packet B4 correction time. In this way, the master determination unit 207 calculates the difference ΔBn (n is a natural number) between the reception time of the offset packet and the correction time with the sniffer device 100b. The master determination unit 207 calculates the total value Σ (ΔBn) of the difference ΔBn as the evaluation value of the clock error.

Returning to FIG. 3, the description of the master determination unit 207 will be continued. When the master determination unit 207 calculates the evaluation value of the clock error of one sniffer device 100, the master determination unit 207 calculates the evaluation value of the clock error again using the other sniffer device 100 as a reference device. The master determination unit 207 determines the sniffer device 100, which has the smallest evaluation value among the calculated evaluation values of the clock error, as the master device.

FIG. 9 is a diagram showing a specific example of a method for determining the master device according to the first embodiment. In FIG. 9, a case where the clock errors ΣΔBn, ΣΔCn, ... ΣΔZn with respect to the other sniffer device 100 is calculated using the sniffer device 100a as a reference device will be described. The evaluation value of the sniffer device 100a is the sum of the clock errors ΣΔBn, ΣΔCn, ... ΣΔZn for each sniffer device 100 (ΣMn) (M is the identifier of the sniffer from B to Z, n is a natural number). The master determination unit 207 calculates an evaluation value for each sniffer device 100 using each sniffer device 100 as a reference device. The master determination unit 207 determines the sniffer device 100 that minimizes the evaluation value of the clock error (= total clock error Σ (ΣMn)) as the master device.

The master determination unit 207 may determine the sniffer device 100 having the highest clock accuracy among the clock accuracy of each sniffer device 100 as the master device. As the clock accuracy, the clock information stored in the sniffer information storage unit 203 may be used. The master determination unit 207 can minimize the clock error of the integrated sniffer data by determining the sniffer device 100 having a small clock error as the master device.

Returning to FIG. 3, the description of the integrated device 200 will be continued. The sniffer registration unit 208 stores the received sniffer information in the sniffer information storage unit 203. When the integrated device 200 communicates with the sniffer device 100, the communication is performed based on the sniffer information stored in the sniffer information storage unit 203.

FIG. 4 is a functional block diagram of the wireless terminal 300 of the first embodiment. The wireless terminal 300 of the embodiment is a device having a wireless communication function. The wireless terminal 300 is, for example, a wireless LAN access point, a personal computer, a smartphone, a tablet computer, a remote control transmitter of building equipment, or a remote control receiver of building equipment. The wireless terminal 300 includes a processor, a memory, an auxiliary storage device, and the like connected by a bus. The wireless terminals 300 each perform wireless communication with each other. The wireless terminal 300 functions as a device including a communication unit 301, a route storage unit 302, and a control unit 303 by executing a wireless communication program.

The communication unit 301 is a network interface. The communication unit 301 communicates with another wireless terminal 300. The communication unit 301 may communicate by a communication method such as a wireless LAN, a wired LAN, or LTE.

The path storage unit 302 is configured by using a storage device such as a magnetic hard disk device or a semiconductor storage device. The route storage unit 302 stores the routing table of the wireless communication system 1. The routing table indicates to which wireless terminal 300 the packet received by the wireless terminal 300 should be transmitted.

The control unit 303 controls the operation of each unit of the wireless terminal 300. The control unit 303 is executed by a device including, for example, a processor and RAM. The control unit 303 functions as a relay processing unit 304 by executing a wireless relay program.

The relay processing unit 304 transmits the received packet to another wireless terminal 300 via the communication unit 301. The relay processing unit 304 determines whether or not the received packet is a packet destined for its own device. If the received packet is not a packet addressed to its own device, the relay processing unit 304 refers to the routing table stored in the route storage unit 302. The relay processing unit 304 determines the destination wireless terminal 300 based on the destination address and the routing table included in the packet.

FIG. 10 is a flowchart showing the flow of the time correction process of the first embodiment. In FIG. 10, a case where integrated sniffer data of the sniffer data of the sniffer device 100a and the sniffer data of the sniffer device 100b is generated will be described as an example. The time correction unit 205 detects the offset packets A1, A2, B1 and B2 included in the sniffer data (step S101). The time correction unit 205 analyzes the packet message and detects the packet having the same parameters as an offset packet. In this example, packets A1 and B1 and packets A2 and B2 are the same packet. The time correction unit 205 calculates the difference between the reception time of the packet A1 and the reception time of the packet A2 as the packet interval TA. (Step S102). The time correction unit 205 calculates the difference between the reception time of the packet B1 and the reception time of the packet B2 as the packet interval TB. (Step S103).

The time correction unit 205 calculates the compression rate based on the packet intervals TA and TB (step S104). The time correction unit 205 calculates the correction time by multiplying the reception times of the packets B1 and B2 by the compression rate (step S105).

FIG. 11 is a flowchart showing a flow of processing for determining the master device of the first embodiment. The master determination unit 207 determines a reference device as a candidate for the master device (step S201). The master determination unit 207 calculates an evaluation value of the clock error between the reference device and the other sniffer device 100 (step S202). The master determination unit 207 calculates the clock error Δt between each offset packet and the correction time. The master determination unit 207 uses the sum of each clock error Δt as the evaluation value of the clock error. The master determination unit 207 determines whether or not the evaluation value of the clock error has been calculated using all the sniffer devices 100 as reference devices (step S203). If there is a sniffer device 100 for which the evaluation value of the clock error has not been calculated (step S203: NO), the process proceeds to step S201. When there is no sniffer device 100 for which the evaluation value of the clock error has not been calculated (step S203: YES), the master determination unit 207 determines the sniffer device 100 having the smallest evaluation value of the clock error as the master device.

FIG. 12 is a sequence diagram showing a flow of processing for generating integrated sniffer data according to the first embodiment. The integrated device registration unit 109 of the sniffer device 100 transmits the sniffer information of its own device to the integrated device 200 (step S301). The sniffer registration unit 208 stores the received sniffer information in the sniffer information storage unit 203 (step S302). When the integrated device 200 communicates with the sniffer device 100, the communication is performed based on the sniffer information stored in the sniffer information storage unit 203. When the sniffer information is stored in the sniffer information storage unit 203, the control unit 204 transmits the packet acquisition duration to the sniffer device 100 of the transmission source (step S303). The time measurement unit 107 measures the time according to the packet acquisition duration (step S304). When the control unit 105 of the sniffer device 100 receives the packet acquisition duration, it starts acquiring the packet via the first communication unit 101 (step S305). Each sniffer device 100 executes each step from step S301 to step S305.

The time measurement unit 107 measures the time according to the packet acquisition duration. When the packet acquisition duration times out, the sniffer data generation unit 106 generates sniffer data based on the packets acquired so far (step S306). The sniffer data generation unit 106 generates a time stamp indicating a packet reception time based on the time information of the own device. The sniffer data generation unit 106 generates sniffer data by adding a time stamp to the packet. The generated sniffer data is transmitted to the integrated device 200 via the second communication unit 102 (step S307). The control unit 204 stores the received sniffer data in the sniffer data storage unit 202. The control unit 204 transmits the packet acquisition duration to the sniffer device 100 (step S308). The time correction unit 205 corrects the time axis included in the sniffer data to the integrated time axis. The sniffer data integration unit 206 generates integrated sniffer data by including a packet of each sniffer data in the sniffer data represented by the integration time axis (step S309). Each sniffer device 100 executes each step from step S305 to step S308.

After that, in the wireless communication system 1, the processes from step S305 to step S309 are repeated (steps S310 to S314).

In the wireless communication system 1 configured in this way, the time axis of the sniffer data is time-corrected by the time correction unit 205 of the integrated device 200. The time correction unit 205 corrects the time by multiplying the reception time by the compression rate. The compression rate is a value represented by a ratio of the intervals between the reception times of the same packet (offset packet) acquired by the two sniffer devices 100. The sniffer data integration unit 206 of the integration device 200 can generate integrated sniffer data by including the time-corrected sniffer data in one sniffer data.

(Second Embodiment)
Next, the wireless communication system 2 in the second embodiment will be described. FIG. 13 is a system configuration diagram of the wireless communication system 1 of the second embodiment. The wireless communication system 1 in the second embodiment is different from the first embodiment in that the sniffer devices 110a and 110b are provided instead of the sniffer devices 100a and 100b, and the integrated device 210 is provided instead of the integrated device 200. However, the other configurations are the same. Hereinafter, the points different from the first embodiment will be described. The sniffer device 110a and the sniffer device 110b each have a region 401a and a region 401b as a range in which packets can be acquired. Hereinafter, when it is not distinguished which sniffer device it is, it will be simply referred to as a sniffer device 110.

FIG. 14 is a functional block diagram of the sniffer device 110 of the second embodiment. The sniffer device 110 stores the acquired sniffer data in a storage device (for example, the sniffer data storage unit 103) in the sniffer device. The sniffer device 110 copies the sniffer data stored in its own device to an external storage device (for example, a network drive, a USB memory, or an SD card). The user moves the sniffer data to the integration device 210 by copying the copied sniffer data to the integration device 210. By executing the packet acquisition program, the sniffer device 110 functions as a device including the first communication unit 101, the sniffer data storage unit 103, and the control unit 115.

The control unit 115 controls the operation of each unit of the sniffer device 110. The control unit 115 is executed by a device including, for example, a processor and RAM. The control unit 115 functions as a sniffer data generation unit 106 and a time measurement unit 107 by executing a packet acquisition program.

FIG. 15 is a functional block diagram of the integrated device 210 of the second embodiment. The integrated device 210 acquires sniffer data stored in an external storage device (for example, a network drive, a USB memory, or an SD card) and stores it in the sniffer data storage unit 202. The integration device 210 generates integrated sniffer data by integrating a plurality of sniffer data. By executing the sniffer data integration program, the integration device 200 functions as a device including a communication unit 201, a sniffer data storage unit 202, and a control unit 214.

The control unit 214 controls the operation of each unit of the integrated device 210. The control unit 214 is executed by a device including, for example, a processor and RAM. The control unit 214 functions as a time correction unit 205, a sniffer data integration unit 206, and a master determination unit 207 by executing the sniffer data integration program.

In the wireless communication system 2 configured in this way, the sniffer data is moved to the integrated device 210 by using an external storage device. Therefore, even if the sniffer data is generated by the sniffer device 110, which cannot simultaneously execute packet acquisition and sniffer data transmission, as in the case where the sniffer device 110 has only one network interface. , The integrated device 210 can generate the integrated sniffer data by correcting the time of the sniffer data and unifying the time axis of the sniffer data.

(Third Embodiment)
Next, the wireless communication system 3 according to the third embodiment will be described. FIG. 16 is a system configuration diagram of the wireless communication system 3 of the third embodiment. The wireless communication system 3 in the third embodiment is different from the first embodiment in that it includes a sniffer device 120 and a sniffer device 130 instead of the sniffer device 100a and the sniffer device 100b, and does not include the integrated device 200. , Other than that, the configuration is the same. The sniffer device 130 and the sniffer device 120 each have a region 402a and a region 402b as a range in which packets can be acquired. In the wireless communication system 3, one of the sniffer devices also functions as the integrated device 200. Hereinafter, the points different from the first embodiment will be described.

FIG. 17 is a functional block diagram of the sniffer device 120 of the third embodiment. The sniffer device 120 acquires packets that can be acquired by its own device among the communications between the wireless terminals 300. The sniffer device 120 generates sniffer data based on the acquired packet. The sniffer device 120 transmits to the sniffer device 130 having a function of integrating the generated sniffer data. By executing the packet acquisition program, the sniffer device 120 functions as a first communication unit 101, a second communication unit 102b, a sniffer data storage unit 103, an integrated sniffer device information storage unit 121, and a control unit 125.

The second communication unit 102b is a network interface. The second communication unit 102 communicates with the sniffer device 130. The second communication unit 102b may communicate by a communication method such as a wireless LAN, a wired LAN, or LTE.

The integrated sniffer device information storage unit 121 is configured by using a storage device such as a magnetic hard disk device or a semiconductor storage device. The integrated sniffer device information storage unit 121 stores information about the sniffer device 130. The information about the sniffer device 130 includes identification information of the sniffer device 130 and sniffer device communication information for communicating with the sniffer device 130. The identification information is information that identifies the sniffer device 130 on the network. The identification information is, for example, information such as an IP address and a MAC address. The sniffer device communication information is information required for communicating with the sniffer device 130. The sniffer device communication information is, for example, information such as a communication protocol or a communication band.

The control unit 125 controls the operation of each unit of the sniffer device 120. The control unit 125 is executed by a device including, for example, a processor and RAM. By executing the packet acquisition program, the control unit 125 functions as a device including the sniffer device registration unit 126 instead of the integrated device registration unit 109.

The sniffer device registration unit 126 transmits sniffer information of its own device to the sniffer device 130. The sniffer information includes sniffer identification information of the own device, sniffer communication information for communicating with the own device, and clock information of the own device.

FIG. 18 is a functional block diagram of the sniffer device 130 of the third embodiment. The sniffer device 130 generates integrated sniffer data based on the sniffer data generated by its own device and the sniffer data received from the sniffer device 120. The sniffer device 130 executes the packet acquisition program and the integrated sniffer data generation program to execute the first communication unit 101, the second communication unit 102b, the sniffer data storage unit 103, the integrated sniffer data storage unit 131, and the sniffer information storage unit. It functions as 132 and control unit 135.

The second communication unit 102b is a network interface. The second communication unit 102 communicates with the sniffer device 120. The second communication unit 102b may communicate by a communication method such as a wireless LAN, a wired LAN, or LTE.

The integrated sniffer data storage unit 131 is configured by using a storage device such as a magnetic hard disk device or a semiconductor storage device. The integrated sniffer data storage unit 131 stores the sniffer data received from the sniffer device 120 and the integrated sniffer data in which the sniffer data is integrated.

The sniffer information storage unit 132 is configured by using a storage device such as a magnetic hard disk device or a semiconductor storage device. The sniffer information storage unit 132 stores sniffer information about the sniffer device 120.

The control unit 135 controls the operation of each unit of the sniffer device 120. The control unit 135 is executed by a device including, for example, a processor and RAM. By executing the packet acquisition program and the integrated sniffer data generation program, the control unit 135 replaces the integrated device registration unit 109 with the sniffer device registration unit 136, the time correction unit 137, the sniffer data integration unit 138, and the master determination unit. It functions as a device further including 139 and a sniffer registration unit 140.

The sniffer device registration unit 136 stores the sniffer information of its own device in the sniffer information storage unit 132. The sniffer information includes sniffer identification information of the sniffer device 130 and clock information of the sniffer device 130.

The time correction unit 137 corrects the time axis included in the sniffer data to the integrated time axis in the same manner as the time correction unit 205. The sniffer data integration unit 138 generates integrated sniffer data in the same way as the sniffer data integration unit 206. The master determination unit 139 determines the master device in the same manner as the master determination unit 207. The sniffer registration unit 140 stores the sniffer information received from the sniffer device 120 in the sniffer information storage unit 132.

In the wireless communication system 3 configured in this way, integrated sniffer data is generated by the sniffer device 130. Therefore, the wireless communication system 3 eliminates the need for the integrated device 200. Therefore, the hardware cost for constructing the wireless communication system can be reduced as compared with the wireless communication system of the first embodiment or the second embodiment.

In each of the above embodiments, the time correction unit, the sniffer data integration unit, and the master determination unit are assumed to be software function units, but they may be hardware function units such as LSI.

According to at least one embodiment described above, a plurality of sniffer data can be integrated by having a time correction unit that corrects the reception time.

Although some embodiments of the present invention have been described, these embodiments are presented as examples and are not intended to limit the scope of the invention. These embodiments can be implemented in various other forms, and various omissions, replacements, and changes can be made without departing from the gist of the invention. These embodiments and modifications thereof are included in the scope and gist of the invention, as well as in the scope of the invention described in the claims and the equivalent scope thereof.

1 ... wireless communication system, 2 ... wireless communication system, 3 ... wireless communication system, 100 ... sniffer device, 101 ... first communication unit, 102 ... second communication unit, 103 ... sniffer data storage unit, 104 ... integrated device information storage Unit, 105 ... Control unit, 106 ... Sniffer data generation unit, 107 ... Time measurement unit, 108 ... Sniffer data transmission control unit, 109 ... Integrated device registration unit, 110 ... Sniffer device, 115 ... Control unit, 120 ... Sniffer device, 102b ... 2nd communication unit, 121 ... integrated sniffer device information storage unit, 125 ... control unit, 126 ... sniffer device registration unit, 130 ... sniffer device, 131 ... integrated sniffer data storage unit, 132 ... sniffer information storage unit, 135 ... Control unit, 137 ... Time correction unit, 138 ... Sniffer data integration unit, 139 ... Master determination unit, 140 ... Sniffer registration unit, 200 ... Integrated device, 201 ... Communication unit, 202 ... Sniffer data storage unit, 203 ... Sniffer information storage Unit, 204 ... Control unit, 205 ... Time correction unit, 206 ... Sniffer data integration unit, 207 ... Master determination unit, 208 ... Sniffer registration unit, 210 ... Integrated device, 214 ... Control unit, 300 ... Wireless terminal, 301 ... Communication Unit, 302 ... Route storage unit, 303 ... Control unit, 304 ... Relay processing unit

Claims (9)

A wireless communication system including a plurality of first communication devices and a second communication device.
The first communication device is
A communication unit that acquires packets propagating in space,
A sniffer data generator that assigns the time when the packet was acquired to the packet and generates sniffer data that includes the packet and indicates the operating status of the network.
With
The second communication device is
A master determination unit that determines the first communication device that emits a clock signal as a reference for correcting the time given to the packet among the first communication devices as the master device.
The packet that is commonly included in the sniffer data generated by the master device and the sniffer data generated by the other first communication device is specified, and at the time given to the packet of the other first communication device. A time correction unit that corrects the time given to the packet of the other first communication device to the time determined by the clock signal by performing a predetermined process on the subject.
A sniffer data integration unit that generates integrated sniffer data including sniffer data generated by the master device and sniffer data generated by the other first communication device, and a sniffer data integration unit.
Equipped with a,
The master determination unit, information indicating the accuracy of the clock signal the first communication device emitted that determine the first communication device satisfies a predetermined condition as the master device,
Wireless communication system. The time correction unit identifies at least two packets that are commonly included in the sniffer data generated by the master device and the sniffer data generated by the other first communication device, and is generated by the master device. The first packet interval, which is the difference between the reception times of the two packets in the sniffer data, and the second packet interval, which is the difference between the reception times of the two packets in the sniffer data generated by the other first communication device. By calculating the value of the ratio of and, and calculating with the value of the ratio with respect to the time given to the packet of the other first communication device, the time of the other first communication device is calculated by the clock signal. The wireless communication system according to claim 1, which is corrected to a time determined by. The time correction unit compares the bits of the packet contained in the sniffer data generated by the master device and the sniffer data generated by the other first communication device, and when the bits match, the packet is said to be said. The wireless communication system according to claim 1 or 2, wherein the packet is identified as a packet commonly included in the sniffer data generated by the master device and the sniffer data generated by the other first communication device. The time correction unit compares the parameters of the packets included in the sniffer data generated by the master device and the sniffer data generated by the other first communication device, and if the parameters match, the packet is said to be said. The wireless communication system according to claim 1 or 2, wherein the packet is identified as a packet commonly included in the sniffer data generated by the master device and the sniffer data generated by the other first communication device. The master determination unit determines a reference device that is a candidate for the master device, and is other than the reference device corrected to a time determined by the clock signal of the reference device and a time determined by the clock signal of the reference device. The wireless communication system according to any one of claims 2 to 4, wherein a difference from the time of the first communication device is calculated, and the reference device having the minimum total value of the differences is determined as the master device. The master determination unit determines a reference device that is a candidate for the master device, and is other than the reference device corrected to a time determined by the clock signal of the reference device and a time determined by the clock signal of the reference device. and time of the first communication device, the difference is calculated, according to the variance value of the difference satisfies a predetermined condition the reference device in any one of請Motomeko 2-4 that determine as said master device Wireless communication system. The wireless communication system according to any one of claims 1 to 6 , wherein the first communication device is arranged so as to acquire a packet common to another first communication device. A master determination unit that determines as a master device the other communication device that emits a clock signal that serves as a reference for correcting the time given to the packet among other communication devices other than the own device that acquires the packet propagating in space. ,
The packet that is commonly included in the sniffer data generated by the master device and the sniffer data generated by the other communication device is specified, and is determined with respect to the time given to the packet of the other communication device. A time correction unit that corrects the time given to the packet of the other communication device to the time determined by the clock signal by performing the above processing.
A sniffer data integration unit that generates integrated sniffer data including sniffer data generated by the master device and sniffer data generated by the other communication device.
Equipped with a,
The master determination section that determine the other communication device information satisfies a predetermined condition indicating the accuracy of the clock signal by the other communication device emitted as the master device,
Communication device. It is a data integration method performed by a wireless communication system including a plurality of first communication devices and a second communication device.
A communication step in which the first communication device acquires a packet propagating in space,
A sniffer data generation step in which the first communication device assigns a time when the packet is acquired to the packet and generates sniffer data including the packet and indicating the operating status of the network.
Have,
A master determination step in which the second communication device determines as the master device the first communication device that emits a clock signal as a reference for correcting the time given to the packet among the first communication devices.
The second communication device identifies the packet commonly included in the sniffer data generated by the master device and the sniffer data generated by the other first communication device, and identifies the packet of the other first communication device. A time correction step of correcting the time given to the packet of the other first communication device to the time determined by the clock signal by performing a predetermined process on the time given to the packet.
A sniffer data integration step in which the second communication device generates integrated sniffer data including sniffer data generated by the master device and sniffer data generated by the other first communication device.
Have a,
A data integration method in which, in the master determination step, the first communication device whose information indicating the accuracy of the clock signal emitted by the first communication device satisfies a predetermined condition is determined as the master device.

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