JP6012510B2 - Wireless network system - Google Patents

Description

  The present invention relates to a wireless network system using wireless communication.

  As a background art in this technical field, there is [Patent Document 1]. This publication describes that a waveform analyzing apparatus that automatically estimates a cause of a transmission failure and a location where the failure has occurred is obtained based on an actual communication packet and a transmission waveform without changing the network configuration.

  An apparatus for capturing a message flowing in a network and analyzing the contents thereof, a message input means for capturing a message flowing in the network, a waveform input means for capturing waveform data of a message flowing in the network, a message input means, and a waveform input Storage means for storing the data captured by the means, and synchronization determination means for determining the correspondence between the message and the waveform data according to a predetermined rule. The synchronization determination means includes information indicating the correspondence between the message and the waveform data. And storing in the storage means.

JP 2008-160356 A

  Patent Document 1 describes that past waveform data accumulated in a buffer is acquired by a pre-trigger function using a message abnormality such as a checksum error as a transmission failure as a trigger. However, the waveform analysis apparatus disclosed in Patent Document 1 cannot acquire waveform data in the case where an abnormality in a message has not been extracted by not detecting the presence of one or more message packets on the transmission line. Also, since the range accumulated by the pre-trigger function is limited to the buffer capacity range and the range that can be obtained directly from the transmission path, it cannot be guaranteed that waveform data related to transmission failure will be recorded. .

  Therefore, the present invention provides a wireless network system for recording a transmission failure in wireless communication in order to perform stable wireless communication. For example, there is provided a wireless network system capable of recording waveform information of a wireless signal when a wireless signal present on the transmission path cannot be detected due to noise or the like.

    In order to solve the above-described problem, in the wireless network system of the present invention, in the first, second, and third wireless signals that are continuous, when the second wireless signal is not detected, at least the first wireless Waveform information from the end of signal reception to before the start of reception of the third radio signal can be recorded and output.

Furthermore, in the present invention, in the wireless network system,
A radio signal address; and means for acquiring the address from the radio signal, having means for acquiring the address from the radio signal, and means for acquiring the address information from the radio signal. A means for comparing the address of the wireless signal and the unique information to determine the presence or absence of the second wireless signal is provided.

Furthermore, in the present invention, in the wireless network system,
Waveform information is selectively recorded from the primary storage unit to the secondary storage unit based on the determination result of the means for determining the presence or absence of the second radio signal.

Furthermore, in the present invention, in the wireless network system,
Means for acquiring the address of the radio signal, and means for acquiring unique information of the radio signal;
The address of the wireless signal and the bit position of the unique information can be changed by recording condition information.

Furthermore, in the present invention, in the wireless network system,
A sequence number is used as unique information of a radio signal.

Furthermore, in the present invention, in the wireless network system,
As the waveform information, one or both of the in-phase component and the quadrature component of the radio signal are recorded.

Furthermore, in the present invention, in the wireless network system,
As the waveform information, time information is included.

Furthermore, in the present invention, in the wireless network system,
The waveform information includes a characteristic value of the internal processing circuit in the receiving circuit unit.
Furthermore, in the present invention, in the wireless network system,
The present invention is characterized by being applied to an in-plant field wireless network system having one or a plurality of wireless terminals.

Furthermore, in the present invention, in the wireless network system,
The present invention is applied to an automatic meter reading wireless network system having one or a plurality of wireless terminals.

Furthermore, in the present invention, in the wireless network system,
It has a communication path switching control function.

  According to the present invention, it is possible to provide a wireless network system capable of improving the reliability of wireless communication and realizing stable wireless communication.

The example of a block diagram of a wireless network system. The example of a block diagram of a radio | wireless failure analysis apparatus. The example of a structure of waveform information. The example of a structure of a radio signal. An example of determination conditions and determination results of the determination unit. An example of record history information. The example of a block diagram of the field wireless network system in a plant. The example of a block diagram of an automatic meter-reading wireless network system. The example of a block diagram of an automatic meter-reading wireless network system. An example using a communication path switching control function by a wireless failure analyzer. The example of a block diagram of the radio | wireless failure analysis apparatus which added the switching control function of the communication path.

  Hereinafter, examples will be described with reference to the drawings.

<Wireless network system>
In this embodiment, an embodiment of the wireless network system 1000 will be described.
FIG. 1 is an example of a configuration diagram of a wireless network system 1000 according to the present embodiment. The radio failure analysis apparatus 100 has a function of inputting an input signal 10 and outputting waveform information 11. The input signal 10 includes at least a first radio signal 21, a second radio signal 22, a third radio signal 23, a first background signal 31, and a second background signal 32. The first radio signal 21 and the second radio signal 22 are temporally continuous with the first background signal 31 in between. Similarly, the second radio signal 22 and the third radio signal 23 are temporally continuous with the second background signal 32 interposed therebetween. That is, the first radio signal 21, the second radio signal 22, and the third radio signal 23 are continuously input.

  Note that the input signal 10 may include a radio signal or a background signal input before the first radio signal 21. Similarly, the input signal 10 may include a radio signal or a background signal that is input after the third radio signal 23.

  When such an input signal 10 is input to the wireless failure analysis apparatus 100, the wireless failure analysis apparatus 100 records the waveform information of the input 10 by the function of the wireless failure analysis apparatus 100 described later. When the second radio signal 22 has not been detected, the waveform information 11 is output. The waveform information 11 includes at least a second radio signal 22, a first background signal 31, and a second background signal 32.

  That is, the wireless network system 1000 has at least the first wireless signal 22 in the continuous first wireless signal 21, the second wireless signal 22, and the third wireless signal 23 when the second wireless signal 22 is not detected. The waveform information from the end of reception of the wireless signal 21 to the start of reception of the third wireless signal 23 can be recorded and output.

  With this configuration, the wireless network system 1000 can record the undetected wireless signal 22 in the waveform information 11 and output it. Then, by analyzing the waveform information 11, the cause of the undetected radio signal 22 is specified, and taking measures to obtain the effect of increasing the reliability of the radio communication can be obtained. As a result, stable wireless communication can be performed.

<Configuration of wireless failure analyzer>
FIG. 2 is an example of a configuration diagram of the wireless failure analysis apparatus 100 of the present embodiment. The antenna unit 101 that receives the input signal 10 has a characteristic capable of receiving a radio signal such as a 2.4 GHz band. The receiving circuit unit 102 receives a matching circuit with the antenna unit 101, filter processing for removing unnecessary band noise, a mixer circuit for converting a carrier frequency to a baseband frequency, and an input signal 10. And an AGC (auto gain control) circuit for changing the gain of the amplifier, and a function of performing A / D conversion processing for converting an analog signal into a digital signal.

  In the receiving circuit unit 102, the input signal 10 becomes waveform information 121 converted into a digital signal, and the primary storage unit 103 has a function of recording the waveform information 121 on a recording medium such as a memory or a hard disk. When the sampling frequency of the A / D conversion process is high, it is preferable to use a storage medium that can be recorded as fast as possible so that a part of the waveform information 121 is recorded and not damaged. By doing so, the effect that the waveform information 121 can be recorded accurately is obtained.

  The waveform information 121 has at least a function of recording a value obtained by continuously or temporally thinning a digital value of an A / D converted wireless signal. When recording values that are continuous in time, the waveform information can be recorded more accurately, so that it is possible to analyze the cause of the radio failure with high accuracy. When recording the thinned value in time, it is only necessary to record the waveform information to the extent necessary for the analysis of the cause of the failure, so that the recording capacity used in the storage medium can be reduced.

  The waveform information 121 recorded in the primary storage unit 103 is not limited to the significant radio signals 21, 22, and 23 for transmitting communication data, but about the background signals 31 and 32 such as mere noise. Including. The primary storage unit 103 has a function of recording all of them.

  FIG. 3 shows an example of the waveform information 121. As the waveform information 121, both the I (in-phase) component and the Q (quadrature) component of the input signal 10 can be recorded. As an example of 10-bit A / D conversion processing, numerical values of I component and Q component are shown in FIG. Further, time information when the input signal 10 is A / D converted to acquire a digital value may be included. The time information may be an absolute time or a relative time from the reference time. In FIG. 3, the example of the relative time from the time of starting of a radio | wireless failure analyzer is shown.

  Further, the characteristic value of the internal processing circuit in the receiving circuit unit 102 may be included. For example, the gain setting value of the variable gain amplifier of the AGC circuit may be included. When the gain setting value of the amplifier of the AGC circuit is changed, the amplitude value of the input signal 10 changes discontinuously in the waveform information 121, so that the waveform can be reproduced when analyzing the recorded waveform information. There is a possibility of disappearing. Therefore, by recording the gain setting value of the amplifier together, the waveform information 121 can be corrected using the gain setting value when analyzing the recorded waveform information 121. As a result, there is an effect that the cause analysis of the radio failure can be made highly accurate.

  The reception demodulation unit 104 detects the synchronization of the radio signals 21, 22, and 23 based on the waveform information 121 recorded in the primary storage unit 103, and performs demodulation processing, error correction processing, and interleaving processing as necessary. The communication data 122 transmitted by the radio signals 21, 22, and 23 is acquired.

  FIG. 4 shows an example of the configuration of the radio signal 21. The radio signals 22 and 23 may have the same configuration. The wireless signal 21 refers to the frame structure of the IEEE 802.15.4 standard. The radio signal 21 includes a preamble, frame detection, frame length, frame control, sequence number, address field, security header, data payload, and FCS (frame check sequence) from the top. The numbers below each item represent the number of bytes.

  The communication data 122 may be composed of, for example, a frame length, a frame control, a sequence number, an address field, a security header, a data payload, and an FCS (frame check sequence).

  The error determination unit 105 determines whether the communication data 122 is correct or incorrect with respect to the obtained communication data 122 by using an error detection method such as a CRC (Cyclic Redundancy Check) code or a SUM check. . In the case of the IEEE 802.15.4 standard, error detection is performed by using a CRC code as the FCS. When the error determination unit 105 determines that the communication data 122 is correct, normal data 123 can be obtained. The normal data 123 may have the same configuration as the communication data 122, for example. Or since FCS is unnecessary, it is good also as a structure except FCS.

  Based on the normal data 123 obtained as a result of the above, the waveform recording determination unit 110 performs processing for outputting the determination signal 124 to the recording selection unit 106.

  In the recording condition input unit 115, the recording condition information 13 is input, whereby the information of the bit position 127 indicating the address 125a and the bit position 128 indicating the unique information 126a included in the normal data 123 is respectively obtained by the address acquisition unit 111. To the unique information acquisition unit 112.

  For example, in the radio signal 21 shown in FIG. 4, the address 125 a is acquired from the address field 202, and the unique information 126 a is acquired from the sequence number 201. When the address 125a is arranged in the b3th to b4th fields, the recording information input unit 115 sets the b3th to b4th as the bit position 127 of the address 125a in the address acquisition unit 111.

  Similarly, the bit position 128 indicating the unique information 126a can also be set. As the unique information 126a, for example, a sequence number 201 that is individually set for each wireless signal and the numerical value is continuous for each wireless signal may be used. Therefore, when the unique information 126a is arranged in the fields from b1 to b2, the recording information input unit 115 sets the b1 to b2 as the bit position 128 of the unique information 126a in the unique information acquisition unit 112.

  Thus, by making it possible to change the bit position 127 of the address 125a and the bit position 128 of the specific information 126a, for example, even when the wireless protocol is changed, the software configuration can be changed without changing the hardware configuration of the apparatus. By changing the processing, it is possible to obtain an effect that the same function can be realized.

  The address acquisition unit 111 acquires from the normal data 123 an address 125a indicating a wireless signal transmission source and reception destination. Similarly, the unique information acquisition unit 112 acquires unique information 126a such as a sequence number. Note that the connection configuration of the address acquisition unit 111 and the unique information acquisition unit 112 may be the configuration illustrated in FIG. 2 or the reverse arrangement. Or it is good also as a structure processed in parallel.

  The acquired address 125a and unique information 126a are input to and stored in the reference information storage unit 113 and are input to the determination unit 114. The determination unit 114 compares the newly input address 125a with the unique information 126a together with the address 125b and the unique information 126b that have been previously input and stored in the reference information storage unit 113, so that the record selection unit 106 is compared. A determination signal 124 for whether or not to record is output.

  Here, for example, when the second radio signal 22 shown in FIG. 1 is not detected, the address 125a and the unique information 126a are acquired from the third radio signal 23, and the address 125b and the unique information 126b are obtained as the first. The determination unit 114 can determine whether or not the wireless signal 22 is present.

  The content of the determination signal 124 for selecting the recording in the recording selection unit 106 may be determined based on the determination conditions in the table shown in FIG. 5, and the determination result may be output as the determination signal 124. In this embodiment, since the sequence number is used as the unique information, the address 125a and the address 125b are the same, and if the unique information 126a and the unique information 126b as the sequence numbers are discontinuous, the determination signal 124 indicates “recording”. Signal. In other determination conditions, the signal is “not recorded”.

  The recording selection unit 106 selectively records the waveform information 121 from the primary storage unit 103 to the secondary storage unit 107 in accordance with the determination signal 124 output from the determination unit 114. Waveform information partially selected from the waveform information 121 is referred to as waveform information 11. As shown in FIG. 1, the waveform information 11 includes a second radio signal 22, a first background signal 31, and a second background signal 32. As the contents of the waveform information 11, a part of the waveform information 121 may be selected in the configuration shown in FIG. At that time, in addition to the waveform information 11, recording history information 12 indicating which waveform information is recorded in the secondary storage unit 107 is added. The record history information 12 may include, for example, the addresses and unique information of radio signals received before and after the recording location. When an address or unique information is included, in addition to the determination result, an address and unique information may be added and output in the determination signal 124. Alternatively, the recording history information 12 may include information indicating the acquisition time of the recorded location and the recording time. Information indicating acquisition time and recording time may be referred to from the waveform information 121.

  The secondary storage unit 107 performs processing for recording the waveform information 11 and the recording history information 12 input from the recording selection unit 106 in a storage medium such as a memory or a hard disk. Since a plurality of waveform information is recorded at the time of recording, a number tag may be attached to the recording history information 12 so that the recorded information can be easily referred to later.

  Finally, the data stored in the secondary storage unit 107 can output the waveform information 11 and the recording history information 12 to the outside via the external I / F unit 108. As the external I / F unit 108, for example, a general-purpose interface such as RS232C or Ethernet (registered trademark) can be used.

  Next, a flowchart regarding the operation of the wireless failure analysis apparatus 100 is shown in FIG. After the operation start step S00 (hereinafter referred to as step S00), the recording condition input (S01) for inputting the bit positions 127 and 128 from the recording condition input unit 115 is performed. It is determined whether there is an input signal 10 (S02). If Yes, the process proceeds to the next step (S03). If No, the operation is terminated (S13).

  In step S03, the input signal 10 is received and the waveform information 121 is acquired (S03). Next, the waveform information 121 is primarily stored in the primary storage unit 103 (S04). Subsequently, the waveform information 121 is demodulated by the reception demodulator 104 (S05). For the obtained communication data 122, the error determination unit 105 determines a communication error and determines whether there is no error (S06). If no error is Yes, the process proceeds to the next step (S07). If No, the operation is terminated (S13).

  In step S07, the address acquisition unit 111 and the unique information acquisition unit 112 acquire an address and unique information from the normal data 123 (S07). Next, the obtained address 125a and unique information 126a are compared with the address 125b and unique information 126b from the reference information storage unit 113 to determine whether the waveform information 121 is to be secondarily stored in the secondary storage unit 107 ( S08). In the case of Yes, a determination signal 124 is output from the determination unit 114, and the recording selection unit 106 performs processing for recording the waveform information 11 and the recording history information 12 in the secondary storage unit 107 (S09). Further, the information in the reference information storage unit 113 is updated to a new address and unique information (S10). In the case of No, only the step of updating the information of the reference information 113 to a new address and unique information (S11) is performed, and the process returns to the step of determining whether there is an input signal (S02).

  Finally, the waveform information 11 and the record history information 12 are output from the external I / F 108 (S12), and the operation is terminated (S13). The above is the processing content of the flowchart showing the operation of the radio failure analysis apparatus 100, but it is also possible to implement the operation from start to end as necessary.

<Field wireless network system in plant>
Next, application examples of the wireless network system according to the present invention will be described. FIG. 8 is a configuration example of the in-plant field wireless network system 1001 in a power plant or the like.

  Introducing wireless communication for monitoring and controlling plant equipment has the advantage of reducing the cable laying cost and introducing the network at a lower cost than the wired network. It is also possible to introduce a network in places where it is difficult to lay cables such as high places and rotating bodies. Furthermore, when it is desired to temporarily install sensor devices during facility maintenance and acquire information, it is not necessary to lay cables, so that a network can be easily introduced.

  As described above, since wireless communication has various merits as compared with wired communication, the need for introduction is increasing. However, in general, a communication error is more likely to occur in wireless communication than in wired communication, and communication reliability is low. In particular, when used for instrumentation control of a power plant or the like, high reliability is required unlike information-related radio such as a mobile phone.

  Further, as a problem of wireless communication, there is a problem that it is difficult to analyze the cause at the time of malfunction. This is because, unlike wired communication, it is difficult to specify the propagation path of a wireless signal, and the reliability of wireless communication changes depending on the state of the surrounding environment.

  As described above, since there are various problems in the wireless communication in the plant field, the wireless communication can be made highly reliable by using the plant field wireless network system according to the present invention.

  A wireless AP (access point) 300 is connected to a backbone network 304 connected to a server or the like. For the wireless AP 300, a plurality of wireless terminals 301a, 301b, 301c, 301d, 301e, 301f, and 301g are installed on the field. On the field, there are sensors 302a and 302b for sucking up sensor information such as temperature and pressure, or an actuator 303 for opening and closing a valve, etc., which are connected to a wireless terminal by wire to monitor or control information. It can be transmitted by a wireless terminal.

  The wireless terminals 301a, 301b, 301c, 301d, 301e, 301f, and 301g constitute a topology such as a mesh type, a star type, and a tree type, and are connected to the wireless AP 300 by one hop or multi-hop. Further, noise 312 is generated from the plant equipment 305 that is a noise source for wireless communication.

  In such a configuration, the in-plant field wireless network system 1001 according to the present invention has wireless communication 311a, 311b, 311c, 311d, 311e between the wireless AP 300 and the wireless terminals 301a, 301b, 301c, 301d, 301e, 301f, 301g. , 311f, 311g are used for monitoring and analysis.

  In such a configuration, for example, the wireless failure analysis apparatus 100 is installed in the vicinity of or inside the wireless terminal 301a. At this time, the input signal 10 received by the wireless failure analysis apparatus 100 includes a certain amount of error from the wireless signal received by the wireless terminal, but can receive substantially the same signal such as signal strength. Although there is a certain amount of error, for example, external noise from the outside of the plant, or if there is a problem with wireless communication due to noise caused by equipment temporarily brought into the plant or the fading environment, only the wireless terminal, It is difficult to estimate the cause of the error later.

  However, by installing the wireless failure analysis apparatus 100 in advance, the cause of the communication error is analyzed by recording the waveform information 11 even for such a temporary or non-reproducible event. Record for this purpose, making it easier to take countermeasures and enabling it to be implemented in the short term.

  Therefore, by installing the wireless failure analysis apparatus 100, any one or more of the wireless communications 311a, 311b, 311c, 311d, 311e, 311f, 311g, and the noise 312 are used as the input signal 10, and the wireless terminals 301a and 301b. , 301c, 301d, 301e, 301f, and 301g, the effects of fading, noise, and the like can be approximately analyzed with respect to communication errors. In particular, in FIG. 8, since the radio failure analysis apparatus 100 is installed in the vicinity of or inside the radio terminal 301a, waveform information is recorded for the radio communications 311a and 311b performed by the radio terminal 301a, and the cause of the communication error is analyzed. Make it possible.

  By constructing such an in-plant field wireless network system, it is possible to contribute to the improvement of the operation rate of the plant equipment and to reduce the cost.

<Automatic meter reading wireless network system>
In this embodiment, an application example of the automatic meter reading wireless network system according to the present invention will be described. FIG. 9 is an example of a configuration diagram of an automatic meter reading wireless network system 1002 that transmits the meter reading value of the watt-hour meter by wireless communication. In the automatic meter-reading wireless network system 1002 of FIG. 9, the components having the same functions as those already described with reference to FIG. .

  In FIG. 9, watt-hour meters 306a, 306b, 306c, 306d, 306e, 306f, and 306g are attached to the wireless terminals 301a, 301b, 301c, 301d, 301e, 301f, and 301g, respectively. The meter readings of the watt-hour meters 306a, 306b, 306c, 306d, 306e, 306f, 306g can be transmitted to the wireless AP 300 by the wireless terminals 301a, 301b, 301c, 301d, 301e, 301f, 301g.

  In addition, since the automatic meter reading wireless network system is generally installed outdoors, a general-purpose wireless device 307 and the like are installed in the vicinity. Therefore, wireless signals output from the wireless device 307 are wireless terminals 301a and 301b. , 301c, 301d, 301e, 301f, and 301g, noise 312 may occur and cause a communication error.

  In the automatic meter reading wireless network system, when the meter reading value of one or a plurality of watt-hour meters cannot be collected by wireless communication due to the influence of noise or the like, the meter reading person goes around and collects the meter reading value manually. For this reason, when a failure occurs in wireless communication, the cost of the meter reader increases. In addition, since it is difficult for the meter reader to collect frequently, there is also an adverse effect that the frequency of monitoring the power consumption decreases.

  In such an environment, by installing the wireless failure analysis device 100 in the automatic meter-reading wireless network system 1002, it is possible to record waveform information of a wireless terminal in which a failure occurs in wireless communication.

  As described above, in this embodiment, an example of the configuration of the automatic meter reading wireless network system according to the present invention has been shown. According to the present invention, it is possible to obtain an effect that it is possible to analyze a failure in wireless communication and to reduce the cost of a meter reader and improve the frequency of monitoring the amount of power used.

  Next, an application example in the in-plant field wireless network system 1003 will be described with reference to FIG. 10 in the case where the communication path switching control function by the wireless failure analyzer 400 is used. In FIG. 10, the wireless failure analysis apparatus 400 is connected to the wireless terminal 301 a via the communication line 401. Other configurations are basically the same as the in-plant field wireless network system of FIG. In the wireless communication apparatus 400, as a result of detecting a communication error in the wireless communication 311a, the wireless communication apparatus 400 communicates via the communication line 401 in order to switch the communication path used by the wireless terminal 301a from the wireless communication 311a to the wireless communication 311h. It is possible to control the wireless terminal 311a so as to switch the route. By switching the communication path, the wireless terminal 301a can perform more reliable wireless communication.

  In order to add such a communication path switching control function, the radio failure analysis apparatus 400 may be configured as shown in FIG. FIG. 11 is basically the same configuration as the radio failure analysis apparatus 100 shown in FIG. 2, but a switching signal generator 116 is added. The determination signal 124 from the determination unit 114 is input to the switching signal generation unit 116 so that the switching signal 14 can be output from the external I / F 108. This switching signal 14 is sent to the wireless terminal 301a via the communication line 401 in FIG. In this embodiment, the switching control is performed by wired communication via the communication line 401. However, the switching control may be performed by wireless communication.

  As described above, since the wireless failure analysis apparatus 400 has the function of switching the communication path of the wireless terminal, it is possible to obtain an effect that the in-plant field wireless network system can be made more reliable.

10 input signal 11 waveform information 12 recording history information 13 recording condition information 14 switching signal 21 (first) wireless signal 22 (second) wireless signal 23 (third) wireless signal 31 (first) background signal 32 (Second) Background Signal 100 Radio Fault Analysis Device 101 Antenna Unit 102 Reception Circuit Unit 103 Primary Storage Unit 104 Reception Demodulation Unit 105 Error Determination Unit 106 Record Selection Unit 107 Secondary Storage Unit 108 External I / F Unit 110 Waveform Recording determination unit 111 Address acquisition unit 112 Specific information acquisition unit 113 Reference information storage unit 114 Determination unit 115 Recording condition input unit 116 Switching signal generation unit 121 Waveform information 122 Communication data 123 Normal data 125a, 125b Address 126a, 126b Specific information 127 bits Position 128 Bit position 201 Sequence number 2 02 Address field 300 Wireless AP
301a, 301b, 301c, 301d, 301e, 301f, 301g Wireless terminals 302a, 302b Sensor 303 Actuator 304 Core network 305 Plant equipment 306a, 306b, 306c, 306d, 306e, 306f, 306g Energy meter 307 Wireless equipment 311a, 311b, 311c, 311d, 311e, 311f, 311g, 311h Wireless communication 312 Noise 400 Wireless failure analysis device 401 Communication line 1000 Wireless network system 1001, 1003 In-plant field wireless network system 1002 Automatic meter reading wireless network system

Claims (6)

When the second radio signal is not detected in the continuous first, second, and third radio signals, at least from the end of reception of the first radio signal to before the start of reception of the third radio signal Waveform information can be selectively recorded and output by decimating in time ,
A radio signal address; and means for acquiring the address from the radio signal, having means for acquiring the address from the radio signal, and means for acquiring the address information from the radio signal. Means for comparing the address of the wireless signal and the unique information to determine the presence or absence of the second wireless signal;
The wireless network system, wherein the address of the wireless signal and the bit position of the unique information can be changed by recording condition information . In claim 1,
A wireless network system, wherein waveform information is selectively recorded from a primary storage unit to a secondary storage unit based on a determination result of a means for determining the presence or absence of a second wireless signal. In claim 1,
A wireless network system using a sequence number as unique information of a wireless signal. In claim 1,
One of the in-phase component and the quadrature component of a radio signal, or both are recorded as waveform information, The radio | wireless network system characterized by the above-mentioned. In claim 4,
A wireless network system including time information as waveform information. In claim 4 or 5,
A radio network system comprising, as waveform information, a characteristic value of an internal processing circuit in a receiving circuit unit.