JP6334486B2 - Wireless communication apparatus, method and program - Google Patents

Description

  The present invention relates to a wireless communication apparatus, method, and program having a DFS (Dynamic Frequency Selection) function.

  In IEEE (Institute of Electrical and Electronics Engineers) 802.11a, which is one of the standards of wireless LAN (Local Area Network), J52, W52, W53, and W56 are defined as channel bands that can be used in the 5 GHz band. . Among these, since W53 and W56 share the frequency with radars such as weather radars, the wireless LAN access point using this channel band is required to implement the DFS function.

  DFS is a function for detecting the presence of a radar and automatically changing the channel used. Wireless LAN access points that use a channel that requires DFS must move from the channel currently in use within 10 seconds and not reuse that channel for the next 30 minutes when radar is detected. It has been demanded. For this reason, when the wireless LAN access point detects a radar, the communication of the wireless LAN client to which it belongs is interrupted by moving the use channel.

  As a method for shortening the communication interruption time, Patent Document 1 describes a method of receiving information on a channel from which a radar is detected from a surrounding wireless LAN access point and determining a destination channel using this information. ing. In this method, since the channel is changed to the movement destination channel determined based on the surrounding radar detection information, it is not necessary to perform the radar detection operation again at the movement destination, and the communication interruption time can be shortened.

Japanese Unexamined Patent Publication No. 2007-214713

  However, in the method described in Patent Document 1, it is possible to reduce the communication interruption time due to the channel change, but it is not possible to determine whether the radar detection result of the wireless LAN access point is correct. If the wireless LAN access point erroneously detects a radio wave that is not a radar as a radar and changes the channel, as shown in FIG. 14, the communication of the wireless LAN client is interrupted unnecessarily, and the usability is greatly reduced. End up. Therefore, it is required to reduce the false detection of the radar and reduce unnecessary channel changes.

  In addition, since it is defined by the standard that the detection rate of the radar exceeds a certain detection rate, it is required to reduce the undetected state that cannot be detected even though the radar is actually present.

  An object of the present invention is to provide a wireless communication apparatus, method, and program that can more accurately estimate the presence / absence of a radar and determine whether to change a channel.

  In order to solve the above-described problem, the wireless communication device of the present invention receives a radar detection unit that detects a radar radio wave of a channel that is being used in wireless communication, and another wireless communication device that uses the channel. Based on the identification signal receiving unit that extracts the identification information of the other wireless communication device from the identification signal and stores the list of identification information in a list storage unit, the presence / absence of the detection of the radar, and the list A channel changing unit that determines whether to change the channel in use to a different channel and changes the channel in use to a different channel when it is determined to change the channel;

  Further, the wireless communication method of the present invention detects the radar radio wave of the channel that is being used in the wireless communication, and from the identification signal received from the other wireless communication device that uses the channel, Extracting identification information, storing a list of the identification information in a list storage unit, determining whether to change the channel in use to a different channel based on the presence or absence of the radar and the list, If it is decided to change, the channel being used is changed to a different channel.

  In addition, the wireless communication program of the present invention allows a computer to detect from a radar detection function that detects radar radio waves of a channel that is being used in wireless communication and an identification signal received from another wireless communication device that uses the channel. The identification signal receiving function for extracting the identification information of the other wireless communication device and storing the list of the identification information in a list storage unit, the presence / absence of the detection of the radar, and the channel being used based on the list A channel changing function for changing the channel in use to a different channel when it is decided to change the channel.

  The wireless communication apparatus, method, and program of the present invention make it possible to more accurately estimate the presence / absence of radar and determine whether to change the channel.

It is a figure which shows the structural example of the radio | wireless communication apparatus of the 1st to 5th embodiment of this invention. It is a figure which shows the operation example of the radio | wireless communication apparatus of 1st embodiment of this invention. It is a figure which shows the example of the identification signal of 2nd embodiment of this invention. It is a figure which shows the operation example of the radio | wireless communication apparatus of 2nd embodiment of this invention. It is a figure which shows the example of the list of the identification information of 2nd embodiment of this invention. It is a figure which shows the example of the radar detection state of 2nd embodiment of this invention. It is a figure which shows the operation example of the radio | wireless communication apparatus of 2nd embodiment of this invention. It is a figure which shows the structural example of the radio | wireless communication apparatus of 2nd-5th embodiment of this invention. It is a figure which shows the operation example of the radio | wireless communication apparatus of 3rd embodiment of this invention. It is a figure which shows the operation example of the radio | wireless communication apparatus of 3rd embodiment of this invention. It is a figure which shows the operation example of the radio | wireless communication apparatus of 4th and 5th embodiment of this invention. It is a figure which shows the operation example of the radio | wireless communication apparatus of 5th embodiment of this invention. It is a figure which shows the hardware structural example of each embodiment of this invention. It is a figure which shows the example of channel switching operation | movement.

[First embodiment]
A first embodiment of the present invention will be described.

  FIG. 1 shows a configuration example of a wireless communication apparatus 10 according to the present embodiment.

  The wireless communication device 10 includes a radar detection unit 11, an identification signal reception unit 12, a list storage unit 13, and a channel change unit 14.

  The radar detection unit 11 is a part that detects a radar radio wave of a channel that is being used in wireless communication.

  The identification signal receiving unit 12 extracts the identification information of the other wireless communication device from the identification signal received from the other wireless communication device that uses the channel being used in the wireless communication, and identifies the other wireless communication device. The list is stored in the list storage unit 13.

  The channel changing unit 14 determines whether to change the channel being used to a different channel based on the presence / absence of radar detection and the list of identification information, and when it is determined to change, the channel changing unit is changed to a different channel. This is the part to change.

  By configuring the wireless communication device 10 in this way, it is possible to more accurately estimate the presence / absence of radar and determine whether to change the channel.

  Next, FIG. 2 shows an example of the operation of the wireless communication apparatus 10 of the present embodiment.

  First, the radar detection unit 11 of the wireless communication device 10 detects the radio wave of the radar of the channel being used (step S101).

  Further, the identification signal receiving unit 12 extracts the identification information of the other wireless communication device from the identification signal received from the other wireless communication device using the channel being used by itself, and the identification information of the other wireless communication device The list is stored in the list storage unit 13 (step S102).

  Next, the channel changing unit 14 determines whether to change the channel being used to a different channel based on the presence / absence of radar detection and the list of identification information. Change to a different channel (step S103).

  By operating the wireless communication device 10 in this manner, it is possible to more accurately estimate the presence / absence of radar and determine whether to change the channel.

  As described above, in the first embodiment of the present invention, whether the channel is changed based on the presence / absence of radar detection and the list of identification information of other wireless communication devices that use the channel being used by itself. Please decide. Accordingly, it is possible to estimate whether the radar detection result is correct and determine whether to change the channel based on the behavior of another wireless communication device. Therefore, it is possible to more accurately estimate the presence / absence of radar and determine whether to change the channel.

[Second Embodiment]
Next, a second embodiment of the present invention will be described.

  In the present embodiment, detection information indicating whether or not a radar has been detected is extracted from an identification signal received from another wireless communication device, and whether or not to change a channel is determined based on the detection information.

  When the radio communication apparatus according to the present embodiment detects a radar, it does not adopt the detection result as it is to change the channel, but determines whether to change the channel based on radar detection information of another radio communication apparatus. decide.

  A configuration example of the wireless communication apparatus 10 of the present embodiment is the same as that of FIG. The wireless communication device 10 corresponds to a wireless LAN access point.

  The radar detection unit 11 is a part that detects the radio wave of the radar of the channel that the wireless communication device 10 is using for wireless communication.

  The identification signal receiving unit 12 is a part that receives an identification signal from another wireless communication device that uses a channel used by the wireless communication device 10 in wireless communication. The identification signal includes identification information of the wireless communication device that is the transmission source of the identification signal, and detection information that indicates whether or not the transmission source wireless communication device has detected the radar. The identification signal receiving unit 12 receives the identification signal, extracts the identification information and the detection information, and causes the list storage unit 13 to store a list in which the identification information and the detection information included in the identification signal are associated with each other.

  FIG. 3 shows an example of the identification signal. This example is an example of an IEEE 802.11 beacon frame. BSSID (Basic Service Set Identifier) is an identifier of a network composed of a wireless LAN access point and a wireless LAN client under the wireless LAN access point, and normally describes a MAC (Media Access Control) address of the wireless LAN access point. Therefore, this BSSID can be used as identification information of the wireless communication device. Further, as in the example of FIG. 3, it is possible to describe radar detection information of the wireless communication device that is the transmission source of the beacon frame in the Vendor Specific area of the beacon frame. Thus, by describing the radar detection information of the transmission source wireless communication device in the beacon frame, the radar detection information can be periodically notified to the wireless communication device receiving the beacon frame.

  The channel changing unit 14 determines whether or not to change the channel based on the presence / absence of radar detection by the radar detecting unit 11 and the list stored in the list storage unit 13. change.

  By configuring the wireless communication device 10 in this way, it is possible to more accurately estimate the presence / absence of radar and determine whether to change the channel.

  Next, FIG. 4 shows an example of the operation of the wireless communication apparatus 10 of the present embodiment.

  First, the radar detection unit 11 detects the radio wave of the radar of the channel that the wireless communication device 10 is using for wireless communication (step S201). When the radar is detected, the identification signal receiving unit 12 receives the identification signal from another wireless communication device that uses the channel used by the wireless communication device 10 in wireless communication. Then, the identification information and the detection information are extracted from the identification signal, and a list in which the identification information and the detection information are associated is stored in the list storage unit 13 (step S202).

  At this time, the identification signal periodically transmitted may be received for a predetermined time to create a list, or the list may be created from the identification signal received by requesting transmission of the identification signal. Further, it is preferable to update the list after waiting for a predetermined time in order to suppress the influence of the timing of changing the detection information of the identification signal and the timing of changing the channel by other wireless communication devices.

  FIG. 5 shows an example of a list stored in the list storage unit 13 when the radar detection state of the wireless communication apparatus is that shown in FIG. FIG. 5A shows an example of a list before radar detection, and FIG. 5B shows an example of a list after radar detection. Wireless communication device A (MAC address 00: AA: AA: AA: AA: AA) and wireless communication device B (MAC address 00: BB: BB: BB: BB: BB) include radar detection information in the identification signal. There is no wireless communication transmission. Wireless communication device C (MAC address 00: CC: CC: CC: CC: CC), wireless communication device D (MAC address 00: DD: DD: DD: DD: DD), wireless communication device E (00: EE: EE : EE: EE: EE) is a wireless communication device that transmits radar detection information in an identification signal. These wireless communication devices transmit an identification signal with detection information “not detected” when radar waves are not detected, and detection information “detected” when detected. In addition, the wireless communication device that transmits the detection information included in the identification signal has a function of determining whether to change the channel based on the behavior of other wireless communication devices, similarly to the wireless communication device 10 of the present embodiment. And

  In FIG. 6, wireless communication devices A to E are wireless communication devices that are using a channel that the wireless communication device 10 is using for wireless communication. Among these, the wireless communication device B (MAC address 00: BB: BB: BB: BB: BB) detects the radar radio wave and changes the channel. Therefore, the MAC address 00: BB: BB: BB: BB: BB exists in the list of FIG. 5A, and does not exist in FIG. 5B. This channel change is stipulated by the standard to be performed within 10 seconds after detection of radar radio waves.

  In FIG. 6, the wireless communication devices D and E detect radar. Therefore, in the list of FIG. 5B, the detection information of the wireless communication device whose MAC address is 00: DD: DD: DD: DD: DD, 00: EE: EE: EE: EE: EE is “detected”. It has changed. The wireless communication devices D and E determine whether or not to change the channel after detecting the radar, and change the channel when it is determined to change the channel.

  In this embodiment, it is assumed that the list shown in FIG. 5B is stored in the list storage unit 13 in step S202 in order to create a list after radar detection.

  Next, the channel change unit 14 determines whether to change the channel based on the detection result of the radar detection unit 11 and the list stored in the list storage unit 13, and changes the channel when it is determined to change the channel. In the present embodiment, a method for calculating the existence possibility of a radar will be described as a determination method. In this method, first, the possibility of existence of a radar is calculated (step S203). Then, it is determined whether to change the channel based on the possibility of existence, and if it is determined to change the channel, the channel is changed (step S204).

  The presence possibility of the radar can be calculated as follows, for example.

  When the radar is detected by many wireless communication apparatuses using the same channel, the radar detection of the radar detection unit 11 is correct and it can be estimated that the possibility that the radar exists is high. Conversely, when many of the wireless communication devices using the same channel do not detect the radar, it may be estimated that the radar detection of the radar detection unit 11 is erroneous and there is a high possibility that the radar does not exist. it can.

Specifically, a method of calculating the existence probability Pa by summing up the weighting factors mai for each of the wireless communication apparatuses whose radar detection information indicates “detected” as in Expression 1 is conceivable. Na indicates the number of identification information of the wireless communication device having radar detection information. Further, ai indicates detection information of each wireless communication device, and is 1 when “detected” and 0 when “not detected”. If this is done, the weighting factors mai of the wireless communication devices whose detection information indicates “detected” will be summed, and the presence probability Pa will be increased when radar is detected by many of the wireless communication devices. Can do. Conversely, the possibility of non-existence can be calculated by setting ai to 0 when “detected” and 1 when “not detected”.

  And when the calculated existence possibility Pa is equal to or higher than the predetermined threshold (first threshold), radar is detected by many wireless communication devices, so there is a possibility that the radar exists in the channel in use. It is determined that the channel will be changed. Also, when the existence possibility Pa is equal to or less than a predetermined threshold (second threshold), it is estimated that there is a high possibility that no radar exists because many wireless communication devices do not detect the radar, Decide not to change channel.

  Here, for example, in Equation 1, the weight coefficient mai of each wireless communication device is set to the reciprocal 1 / Na of the number Na of wireless communication devices having radar detection information. Then, the existence possibility Pa calculates the ratio of the number of wireless communication devices whose radar detection information indicates “detected” to the number of wireless communication devices with radar detection information. When the ratio is equal to or higher than a predetermined ratio (first threshold value), for example, 70% or higher, the radar detection of the radar detector 11 is correct, and it can be determined that the radar is present and the channel is changed. . Further, when the ratio is equal to or less than a predetermined ratio (second threshold value), for example, 20% or less, the radar detection of the radar detection unit 11 is erroneous, and it is estimated that no radar exists and the channel is not changed. Can be determined.

  It is also possible to determine whether to change the channel by combining the conditions based on the first threshold and the conditions based on the second threshold.

  FIG. 7 shows an example of a channel change determination method when the above two conditions are combined. First, when the calculated existence possibility is equal to or greater than the first threshold (step S301), it is determined to change the channel, and the channel is changed (step S303). When the possibility of existence is less than the first threshold value, the possibility of existence is compared with the second threshold value (step S302). Then, when the possibility of existence is equal to or less than the second threshold, it is determined not to change the channel. When none of the conditions are met, the detection result of the radar detector 11 is adopted, it is determined that the channel is changed, and the channel is changed (step S303). When none of the conditions is met, it can be determined that the channel is not changed.

  By operating the wireless communication device 10 in this manner, it is possible to more accurately estimate the presence / absence of radar and determine whether to change the channel.

  In addition, the identification signal transmission part 25 which transmits an identification signal to the radio | wireless communication apparatus 10 is added like the radio | wireless communication apparatus 20 of FIG. 8, and the detection information whether the radar detection part 11 detected the electromagnetic wave of the radar is identified. It is also possible to transmit by including in a signal. At this time, when the radar detection unit 11 detects the radar, the detection information is detected, and when the channel is changed or when it is determined that the radar is not present and it is determined that the channel is not changed, the detection information is not detected. good. In this manner, by adding the identification signal transmission unit 25, it is possible to notify other wireless communication devices that the radar has been detected.

  As described above, in the second embodiment of the present invention, as in the first embodiment, the presence / absence of radar detection and the identification information of other wireless communication devices that use the channel that the device itself is using. Decide whether to change channels based on the list. Accordingly, it is possible to estimate whether the radar detection result is correct and determine whether to change the channel based on the behavior of another wireless communication device. Therefore, it is possible to more accurately estimate the presence / absence of radar and determine whether to change the channel.

  Further, since it is possible to estimate that the radar detection is erroneous and decide not to change the channel, unnecessary channel change due to erroneous detection can be reduced.

  Further, by extracting radar detection information from an identification signal received from another wireless communication device, detection information of the other wireless communication device can be easily obtained.

[Third embodiment]
Next, a third embodiment of the present invention will be described.

  This embodiment is a mode for estimating whether or not its own radar detection result is correct based on the behavior of other wireless communication devices before and after radar detection.

  When the radio communication apparatus according to the present embodiment detects a radar, does the channel change based on the behavior of other radio communication apparatuses before and after the radar detection, instead of adopting the detection result as it is and changing the channel? Please decide.

  A configuration example of the wireless communication device 10 is the same as that of FIG. Further, as shown in FIG. 8, an identification signal transmission unit 25 may be provided.

  In the identification signal receiving unit 12 of the present embodiment, not only when the radar detection unit 11 detects radar radio waves but also before the detection, the identification signal is periodically received and the list is stored in the list storage unit 13. . The identification signal includes identification information of the wireless communication device that is the transmission source of the identification signal.

  Then, when the radar detection unit 11 detects the radar radio wave, the channel change unit 14 determines whether to change the channel according to the contents of the list before detection (before update) and the list after detection (after update). If you decide to change the channel, change the channel.

  By configuring the wireless communication device 10 in this way, it is possible to more accurately estimate the presence / absence of radar and determine whether to change the channel.

  Next, FIG. 9 shows an example of the operation of the wireless communication apparatus 10 of the present embodiment.

  First, the identification signal receiving unit 12 periodically receives an identification signal from another wireless communication device, and stores a list of identification information of the wireless communication device that is the transmission source of the identification signal in the list storage unit 13 (step S401).

  Then, after the radar detection unit 11 detects the radar radio wave (step S402), it further receives an identification signal and stores a list of identification information after detection in the list storage unit 13 (step S403).

  At this time, the identification signal periodically transmitted may be received for a predetermined time to create a list, or the list may be created from the identification signal received by requesting transmission of the identification signal. In addition, in order to suppress the influence of a shift in timing when other wireless communication devices change channels, it is preferable to wait for a predetermined time after radar detection and receive the identification signal.

  Next, the presence possibility of the radar is calculated based on the update contents of the list before detection (before update) and the list after detection (after update) (step S404). Then, it is determined whether to change the channel based on the possibility of existence, and when it is determined to change the channel, the channel is changed (step S405).

  The presence possibility of the radar can be calculated as follows, for example.

  For example, the wireless communication device B (MAC address 00: BB: BB: BB: BB: BB: BB) in FIGS. 5 and 6 exists in the list before radar detection (FIG. 5A), and after detection. It is assumed that there is a wireless communication apparatus that does not exist in the list (FIG. 5B). In such a case, the radio communication apparatus B can estimate that the radio communication apparatus 10 no longer exists in the channel in which radio communication is performed as a result of detecting the radar and changing the channel. However, the accuracy of this estimation is not sufficient because it may be caused by other than radar detection, such as power off or setting change. Therefore, this estimation is performed only for wireless communication devices that do not include radar detection information in the identification signal, and for wireless communication devices that include radar detection information in the identification signal, the detection information is trusted and this estimation is not performed. good.

Specifically, as shown in Equation 2, the weighting factor mbi for each of the wireless communication devices that are present in the list before the radar detection and not in the list after the radar detection is summed to calculate the existence probability Pb. A method is conceivable. Nb indicates the number of identification information of the wireless communication devices existing in the list before radar detection. In addition, bi indicates whether each wireless device existing in the list before radar detection is present in the list after detection, and is 1 when disappearing in the list after detection, and 0 when existing in the list after detection. It shall be. In this way, the weighting factors mbi of the wireless communication devices that exist in the list before the radar detection and do not exist in the list after the radar detection are totaled, and many of the wireless communication devices disappear after the radar detection. In some cases, the possibility of existence Pb can be increased. Conversely, the possibility of non-existence can be calculated by assuming that bi disappears in the list after detection, and that 1 exists in the list after detection.

  Here, for example, in Equation 2, the weight coefficient mbi of each wireless communication device is set to the reciprocal 1 / Nb of the number Nb of wireless communication devices existing in the list before radar detection. Note that the wireless communication device here is a wireless communication device that does not transmit radar detection information. Then, the existence possibility Pb indicates the ratio of the wireless communication devices that are present in the list before the radar detection and that do not transmit the radar detection information are not present in the list after the radar detection. When the possibility of existence is equal to or less than a predetermined threshold value, it is estimated that no radar is present, so it is determined that the channel is not changed. Since the accuracy of this estimation is not sufficient, and the radar itself is detected, the predetermined threshold value in this case may be set to a low value such as 0%.

  In addition, the existence possibility calculation method and the channel change determination method of this embodiment can be combined with the method of the second embodiment. For example, as shown in FIG. 10, it is conceivable that step S304 is added between step S302 and step S303 in FIG. 7, and after the determination by the method of the second embodiment, the determination is made by the method of this embodiment.

In addition, as a combination method of the method of the present embodiment and the second embodiment, a new existence possibility Pc is calculated from the existence possibility Pb of the present embodiment and the existence possibility Pa of the second embodiment. It may be determined whether to change the channel based on the existence possibility Pc. For example, as in Expression 3 below, the possibility of existence Pc is calculated by multiplying the possibility of existence Pa and Pb by weighting coefficients mpa and mpb and adding them, and the possibility of existence Pc is equal to or greater than a threshold (for example, (0.3 or higher), it is possible to decide to change the channel.

More specifically, for example, the existence possibility Pc can be calculated as shown in Equation 4. Here, since the reliability of the existence possibility Pb is low, the weight coefficient mpb for Pb is made smaller than the weight coefficient mpa for Pa.
A: Number of wireless communication devices whose detection information indicates “Detected” in the list after radar detection (after update)
B: Number of wireless communication devices with detection information in the list after radar detection (after update)
C: Number of wireless communication devices that exist in the list before radar detection (before update), do not exist in the list after radar detection (after update), and have no detection information
D: Number of wireless communication devices with no detection information in the list before radar detection (before update)

  By operating the wireless communication device 10 in this way, it is possible to more accurately estimate the presence / absence of radar and determine whether to change the channel.

  As described above, in the third embodiment of the present invention, as in the first and second embodiments, the presence or absence of radar detection and other wireless communication devices that use the channel that is being used. Determine whether to change the channel based on the list of identification information. As a result, it is possible to estimate whether the radar detection result is correct or not and determine whether to change the channel based on the behavior of another wireless communication device. Therefore, it is possible to more accurately estimate the presence or absence of the radar and determine whether to change the channel.

  Further, since it is possible to estimate that the radar detection is erroneous and decide not to change the channel, it is possible to reduce unnecessary channel change due to erroneous detection.

  Furthermore, in the present embodiment, a wireless communication device that does not transmit radar detection information can also be used for determining whether to change the channel.

[Fourth embodiment]
Next, a fourth embodiment of the present invention will be described.

  As in the second embodiment, the present embodiment extracts detection information on whether or not a radar has been detected from an identification signal received from another wireless communication device, and determines whether to change the channel based on the detection information. It is a form to do. When the wireless communication apparatus of the second embodiment detects a radar, the wireless communication apparatus estimates whether the detection is correct and determines whether to change the channel. On the other hand, when the wireless communication device of the present embodiment does not detect the radar, the wireless communication device estimates whether it is correct that the radar is not detected based on the radar detection information of the other wireless communication device. And decide whether to change the channel.

  A configuration example of the wireless communication device 10 is the same as that of FIG. Further, as shown in FIG. 8, an identification signal transmission unit 25 may be provided.

  The radar detection unit 11 is a part that detects the radio wave of the radar of the channel that the wireless communication device 10 is using for wireless communication.

  The identification signal receiving unit 12 is a part that receives an identification signal from another wireless communication device that uses a channel that the wireless communication device 10 is using. The identification signal includes identification information of the wireless communication device that is the transmission source of the identification signal, and detection information that indicates whether or not the transmission source wireless communication device has detected the radar. The identification signal receiving unit 12 receives the identification signal, extracts the identification information and the detection information from the received identification signal, and stores the list in which the identification information and the detection information are associated with each other in the list storage unit 13.

  The channel changing unit 14 determines whether or not to change the channel based on whether or not the radar detection unit 11 detects the radar and the list stored in the list storage unit 13. It is a part to do.

  By configuring the wireless communication device 10 in this way, it is possible to more accurately estimate the presence / absence of radar and determine whether to change the channel.

  Next, FIG. 11 shows an example of the operation of the wireless communication apparatus 10 of the present embodiment.

  First, the identification signal receiving unit 12 periodically receives an identification signal and stores the list in the list storage unit 13 (step S501). At this time, the list storing unit 13 stores a list in which the identification information of the identification signal transmission source wireless communication device is associated with the radar detection information.

  When the radar is not detected (step S501), the channel changing unit 14 calculates the presence possibility of the radar based on the list detection information (step S503). Then, it is determined whether to change the channel based on the possibility of existence, and when it is determined to change the channel, the channel is changed (step S504).

  The possibility of radar presence can be calculated as follows.

  For example, when the radar detection unit 11 does not detect a radar but the number of wireless communication devices whose radar detection information indicates “detected” increases, it can be estimated that the radar is present. In this way, even when the radar detection unit 11 cannot detect the radar for some reason, it can be estimated that the radar is present from the radar detection information of another wireless communication device.

  For this reason, a method of calculating the existence possibility Pa using an expression in which the possibility of existence increases as the number of wireless communication devices whose radar detection information indicates “detected” increases, for example, Expression 1 of the second embodiment is conceivable.

  And when the calculated existence possibility Pa is equal to or higher than the predetermined threshold (first threshold), radar is detected by many wireless communication devices, so there is a possibility that the radar exists in the channel in use. It is determined that the channel will be changed.

  Here, for example, in Equation 1, the weight coefficient mai of each wireless communication device is set to the reciprocal 1 / Na of the number Na of wireless communication devices having radar detection information. Then, the existence possibility Pa is a ratio of the number of wireless communication devices whose radar detection information indicates “detected” to the number of wireless communication devices with radar detection information. Then, it is conceivable to decide to change the channel when the threshold value is equal to or higher than a predetermined threshold value (first threshold value), for example, 70% or higher. At this time, the first threshold value of the present embodiment may be set to a value different from the first threshold value of the second embodiment.

  Note that the channel change determination method of this embodiment can be applied simultaneously with the methods of the second and third embodiments.

  By operating the wireless communication device 10 in this way, it is possible to more accurately estimate the presence / absence of radar and determine whether to change the channel.

  As described above, in the fourth embodiment of the present invention, as in the first to third embodiments, the presence or absence of radar detection and other wireless communication devices that use the channel that is being used. It is determined whether to change the channel based on the list of identification information. Accordingly, it is possible to estimate whether the radar detection result is correct and determine whether to change the channel based on the behavior of another wireless communication device. Therefore, it is possible to more accurately estimate the presence / absence of radar and determine whether to change the channel.

  Further, even when the radar itself is not detected, it is possible to increase the possibility that the channel can be changed based on the radar detection information of another wireless communication device, assuming that the radar is present.

  Further, by extracting radar detection information from an identification signal received from another wireless communication device, detection information of the other wireless communication device can be easily obtained.

[Fifth embodiment]
Next, a fifth embodiment of the present invention will be described.

  As in the third embodiment, the present embodiment is a mode in which whether or not to change the channel is estimated by estimating whether or not its own radar detection result is correct according to the behavior of another wireless communication device.

  When the wireless communication device of the third embodiment detects a radar, it estimates whether the detection is correct. On the other hand, when the wireless communication device of the present embodiment does not detect the radar, the wireless communication device estimates whether it is correct that the radar is not detected based on the behavior of the other wireless communication device. Decide whether to change the channel.

  A configuration example of the wireless communication device 10 is the same as that of FIG. Further, as shown in FIG. 8, an identification signal transmission unit 25 may be provided.

  The identification signal receiving unit 12 is a part that receives an identification signal from another wireless communication device that uses a channel that the wireless communication device 10 is using. The identification signal includes identification information of the wireless communication device that is the transmission source of the identification signal. The identification signal receiving unit 12 receives the identification signal, extracts identification information from the identification signal, and stores the list of identification information in the list storage unit 13. The identification signal receiving unit 12 of the present embodiment periodically receives the identification signal and updates the list in the list storage unit 13.

  The channel changing unit 14 determines whether or not to change the channel based on the presence / absence of radar detection by the radar detecting unit 11 and the list stored in the list storage unit 13, and changes the channel when it is determined to change the channel. It is a part to do. The channel changing unit 14 according to the present embodiment determines whether or not to change the channel according to the updated contents of the list in the list storage unit 13.

  By configuring the wireless communication device 10 in this way, it is possible to more accurately estimate the presence or absence of radar and determine whether to change the channel.

  Next, an example of the operation of the wireless communication apparatus 10 according to the present embodiment will be described with reference to FIG.

  First, the identification signal receiving unit 12 periodically receives an identification signal and updates the list in the list storage unit 13 (step S501). At this time, the list storage unit 13 stores a list of identification information of the wireless communication device that is the transmission source of the identification signal.

  When the radar is not detected (step S501), the channel changing unit 14 calculates the presence possibility of the radar based on the updated contents of the list (step S503). Then, it is determined whether to change the channel based on the possibility of existence, and when it is determined to change the channel, the channel is changed (step S504).

  For example, the radar detection unit 11 does not detect a radar, but when there are no more wireless communication devices having no radar detection information, it can be estimated that a radar is present. A wireless communication apparatus that does not have a function of estimating whether the radar detection result is correct performs a channel change when the radar is detected. Therefore, when the existing wireless communication device no longer exists, it can be estimated that the wireless communication device may have detected a radar and changed the channel. By using this estimation, even when the radar detection unit 11 cannot detect the radar for some reason, it is possible to estimate that the radar exists from the behavior of other wireless communication devices.

  Specifically, as in the third embodiment, the existence possibility Pb can be calculated using Expression 2. However, “before detection” and “after detection” in the third embodiment are read as “before update” and “after update” in this embodiment.

  Here, for example, in Equation 2, the weight coefficient mbi of each wireless communication device is set to the reciprocal 1 / Nb of the number Nb of wireless communication devices existing in the list before update. Note that the wireless communication device here is a wireless communication device that does not transmit radar detection information. Then, the existence possibility Pb is a ratio of the number of wireless communication apparatuses that are no longer present in the list after the update to the number of wireless communication apparatuses that do not have the radar detection information present in the list before the update. Then, when the existence possibility Pb is equal to or greater than a predetermined threshold value, for example, 100% or more, it is conceivable to determine that the radar is present and to change the channel. Since this estimation method has low accuracy as described in the third embodiment, and the wireless communication device 10 is in a state in which no radar is detected, the conditions for determining the channel change should be set strictly. Is desirable.

  Also, the channel change determination method of the present embodiment can be combined with the method of the fourth embodiment. For example, as shown in FIG. 12, it can be considered that the method is determined by the method of the fourth embodiment (step S601) and then determined by the method of the present embodiment (step S602).

  As a combination method of the method of the present embodiment and the fourth embodiment, a new existence possibility Pc obtained by combining the existence possibility Pa and the existence possibility Pb may be calculated. For example, the possibility of existence Pc is calculated as shown in Equation 3 of the third embodiment, and when the possibility Pc is equal to or higher than a predetermined threshold (for example, 0.7 or higher), it is possible to determine to change the channel. More specifically, for example, the existence possibility Pc can be calculated as shown in Equation 4 of the third embodiment.

  Note that the channel change determination method of this embodiment can be applied simultaneously with the methods of the second and third embodiments.

  By operating the wireless communication apparatus 10 in this way, it is possible to determine whether or not to change the channel by more accurately estimating the presence or absence of the radar.

  As described above, in the fifth embodiment of the present invention, as in the first to fourth embodiments, the presence / absence of radar detection and other wireless communication devices that use the channel in use are used. Determine whether to change the channel based on the list of identification information. Accordingly, it is possible to determine whether or not to change the channel by estimating whether or not the radar detection result is correct according to the behavior of another wireless communication device. Therefore, it is possible to determine whether or not to change the channel by more accurately estimating the presence or absence of the radar.

  Further, even when the radar itself is not detected, it is possible to increase the possibility that the channel can be changed by estimating that the radar is present based on information of another wireless communication device.

  Furthermore, in the present embodiment, a wireless communication device that does not transmit radar detection information can also be used for determining whether to change the channel.

[Hardware configuration example]
A configuration example of hardware resources for realizing the wireless communication devices (10, 20) in the above-described embodiments of the present invention using one information processing device (computer) will be described. The wireless communication devices (10, 20) may be realized using at least two information processing devices physically or functionally. The wireless communication devices (10, 20) may be realized as dedicated devices. Moreover, you may implement | achieve only one part function of a radio | wireless communication apparatus (10, 20) using information processing apparatus.

  FIG. 13 is a diagram schematically illustrating a hardware configuration example of an information processing apparatus capable of realizing the wireless communication apparatus according to each embodiment of the present invention. The information processing device 40 includes a communication interface 41, an input / output interface 42, an arithmetic device 43, a storage device 44, and a nonvolatile storage device 45.

  The communication interface 41 is a communication means for the wireless communication device (10, 20) of each embodiment to communicate with an external device in a wired or / and wireless manner. When the wireless communication devices (10, 20) are realized using at least two information processing devices, the devices may be connected to each other via the communication interface 41 so that they can communicate with each other.

  The input / output user interface 42 is a man-machine interface such as a keyboard which is an example of an input device and a display as an output device.

  The arithmetic device 43 is an arithmetic processing device such as a general-purpose CPU (Central Processing Unit) or a microprocessor. For example, the arithmetic device 43 can read out various programs stored in the nonvolatile storage device 45 to the storage device 44 and execute processing according to the read programs.

  The storage device 44 is a memory device such as a RAM (Random Access Memory) that can be referred to from the arithmetic device 43, and stores programs, various data, and the like. The storage device 44 may be a volatile memory device.

  The nonvolatile storage device 45 is a nonvolatile storage device such as a ROM (Read Only Memory) or a flash memory, and can record various programs, data, and the like.

  In each embodiment of the present invention, for example, the information processing device 40 illustrated in FIG. 13 constitutes a wireless communication device (10, 20), and the functions described in the above embodiments are realized for this wireless communication device. It may be realized by supplying a possible program. In this case, the embodiment can be realized by the arithmetic device 43 executing the program supplied to the wireless communication device. It is also possible to configure some of the functions of the information processing apparatus 40 instead of all of the wireless communication apparatus.

  Further, the program may be recorded in an external storage medium so that the program is appropriately stored in the nonvolatile storage device 45 at the time of shipment or operation of the wireless communication device. In this case, as the program supply method, a method of installing in the wireless communication apparatus using an appropriate jig may be employed in a manufacturing stage before shipment or an operation stage. The program supply method may employ a general procedure such as a method of downloading from the outside via a communication line such as the Internet.

  Each of the above-described embodiments is a preferred embodiment of the present invention, and various modifications can be made without departing from the scope of the present invention.

  A part or all of the above-described embodiment can be described as in the following supplementary notes, but is not limited thereto.

(Appendix 1)
A radar detection unit that detects the radio waves of the channel being used for wireless communication;
An identification signal receiving unit that extracts identification information of the other wireless communication device from an identification signal received from another wireless communication device that uses the channel, and stores a list of the identification information in a list storage unit;
A channel for determining whether to change the channel in use to a different channel based on the presence / absence of the detection of the radar and the list, and to change the channel in use to a different channel when it is determined to change the channel A wireless communication device comprising: a changing unit.

(Appendix 2)
When the identification signal receiving unit detects the radio wave of the radar, the identification signal receiving unit extracts detection information as to whether or not the other wireless communication device has detected the radar from the identification signal, and the identification information and the detection information Is stored in the list storage unit,
The wireless communication according to claim 1, wherein the channel changing unit determines whether to change the channel being used to a different channel according to the detection information in the list when the radio wave of the radar is detected. apparatus.

(Appendix 3)
The identification signal receiving unit periodically receives the identification signal, extracts detection information as to whether the other wireless communication device has detected the radar from the identification signal, and extracts the identification information and the detection information. Storing the associated list in the list storage unit;
The wireless communication apparatus according to Supplementary Note 1 or Supplementary Note 2, wherein the channel changing unit determines whether to change the channel being used to a different channel according to the detection information in the list.

(Appendix 4)
The channel change unit calculates the existence possibility of the radar based on the list, and determines whether to change the channel in use to a different channel based on the existence possibility. Alternatively, the wireless communication device according to attachment 3.

(Appendix 5)
The existence possibility is calculated by summing weighting factors for each of the identification information indicating that the detection information is detected,
The wireless communication device according to appendix 4, wherein the weighting factor is a real value greater than or equal to zero.

(Appendix 6)
The wireless communication apparatus according to appendix 5, wherein the weighting factor is a reciprocal of the number of the identification information with the detection information.

(Appendix 7)
The identification signal receiving unit periodically receives the identification signal and updates the list,
The wireless communication apparatus according to any one of appendix 1 to appendix 6, wherein the channel change unit calculates the existence possibility of the radar according to the content of the update of the list.

(Appendix 8)
The channel change unit calculates the existence possibility of the radar based on the list, and determines whether to change the channel in use to a different channel based on the existence possibility. A wireless communication device according to 1.

(Appendix 9)
The possibility of existence is calculated by summing the weighting factors for each of the identification information that exists in the list before the update and does not exist in the list after the update,
The wireless communication apparatus according to appendix 8, wherein the weighting factor is a real value greater than or equal to zero.

(Appendix 10)
The wireless communication apparatus according to appendix 9, wherein the weighting factor is a reciprocal of the number of the identification information existing in the list before the update.

(Appendix 11)
When calculating the two or more types of existence possibilities, the channel changing unit calculates a new existence possibility by adding a value obtained by multiplying each of the existence possibilities by a weighting factor, and calculating the new existence possibility. The wireless communication apparatus according to any one of Supplementary Note 4 to Supplementary Note 6, and Supplementary Note 8 to Supplementary Note 10, wherein whether or not to change the channel being used to a different channel is determined based on the existence possibility.

(Appendix 12)
From the supplementary note 4 to the supplementary note 6 and the supplementary note 8, the channel changing unit determines that the channel being used is changed to a different channel when the existence possibility is equal to or greater than a predetermined first threshold value. The wireless communication device according to any one of appendix 11.

(Appendix 13)
The channel change unit determines not to change from the currently used channel to a different channel when the possibility of existence is equal to or less than a predetermined second threshold value. The wireless communication apparatus according to any one of appendix 12.

(Appendix 14)
14. The wireless communication apparatus according to any one of appendix 1 to appendix 13, further comprising: an identification signal transmission unit that includes detection information indicating whether or not the radio wave of the radar is detected in the identification signal.

(Appendix 15)
The wireless communication apparatus according to appendix 14, wherein the identification signal transmission unit transmits the identification signal without detecting the detection information when determining that the channel being used is not changed to a different channel.

(Appendix 16)
The wireless communication apparatus according to any one of supplementary notes 1 to 15, wherein the identification signal is a beacon signal.

(Appendix 17)
Detects the radar radio wave of the channel being used in the wireless communication, extracts the identification information of the other wireless communication device from the identification signal received from the other wireless communication device using the channel, A list is stored in a list storage unit, and whether to change the channel in use to a different channel based on the presence / absence of the detection of the radar and the list is determined. A wireless communication method characterized by changing the channel to a different channel.

(Appendix 18)
When detecting the radio wave of the radar, the detection information indicating whether the other wireless communication device has detected the radar is extracted from the identification signal, and the list in which the identification information and the detection information are associated with each other is extracted. 18. The supplementary note 17, characterized in that, when the radio wave of the radar is detected and stored in the list storage unit, it is determined whether to change the channel being used to a different channel according to the detection information of the list. Wireless communication method.

(Appendix 19)
Periodically receiving the identification signal, extracting detection information as to whether the other wireless communication device has detected the radar from the identification signal, and associating the list with the identification information and the detection information 19. The wireless communication method according to appendix 17 or appendix 18, wherein the wireless communication method stores the data in a list storage unit and determines whether to change the channel in use to a different channel based on the detection information in the list.

(Appendix 20)
The appendix 18 or appendix 19, wherein the presence possibility of the radar is calculated based on the list, and whether to change the channel in use to a different channel based on the existence possibility is determined. Wireless communication method.

(Appendix 21)
The existence possibility is calculated by summing weighting factors for each of the identification information indicating that the detection information is detected,
The wireless communication method according to appendix 20, wherein the weighting factor is a real value greater than or equal to zero.

(Appendix 22)
The wireless communication method according to appendix 21, wherein the weighting factor is a reciprocal number of the identification information with the detection information.

(Appendix 23)
Periodically adding the identification signal to update the list, and determining whether to change the channel in use to a different channel according to the contents of the update of the list. A wireless communication method according to any one of the above.

(Appendix 24)
24. The wireless communication method according to claim 23, wherein the presence possibility of the radar is calculated based on the list, and it is determined whether to change the channel in use to a different channel based on the presence possibility. .

(Appendix 25)
The possibility of existence is calculated by summing the weighting factors for each of the identification information that exists in the list before the update and does not exist in the list after the update,
The wireless communication method according to appendix 24, wherein the weighting factor is a real value greater than or equal to zero.

(Appendix 26)
26. The wireless communication method according to appendix 25, wherein the weighting factor is a reciprocal number of the identification information existing in the list before the update.

(Appendix 27)
When calculating two or more types of the existence possibilities, a new existence possibility is calculated by adding each of the existence possibilities multiplied by a weighting factor, and based on the new existence possibility. The wireless communication method according to any one of Supplementary Note 20 to Supplementary Note 22, and Supplementary Note 24 to Supplementary Note 26, wherein whether to change the channel being used to a different channel is determined.

(Appendix 28)
When the possibility of existence is equal to or greater than a predetermined first threshold value, it is determined that the channel being used is changed to a different channel. Any one of appendix 20 to appendix 22, and appendix 24 to appendix 27 The wireless communication method described.

(Appendix 29)
Any one of appendix 20 to appendix 22, and appendix 24 to appendix 28, wherein when the possibility of existence is equal to or less than a predetermined second threshold, it is determined that the channel being used is not changed to a different channel. The wireless communication method described in 1.

(Appendix 30)
The wireless communication method according to any one of appendix 17 to appendix 29, wherein detection information indicating whether the radio wave of the radar is detected is included in the identification signal and transmitted.

(Appendix 31)
The wireless communication method according to supplementary note 30, wherein when the channel being used is determined not to be changed to a different channel, the identification signal is transmitted without detecting the detection information.

(Appendix 32)
The wireless communication method according to any one of appendix 17 to appendix 31, wherein the identification signal is a beacon signal.

(Appendix 33)
On the computer,
Radar detection function that detects the radar radio wave of the channel you are using in wireless communication,
An identification signal receiving function for extracting identification information of the other wireless communication device from an identification signal received from another wireless communication device using the channel, and storing a list of the identification information in a list storage unit;
A channel for determining whether to change the channel in use to a different channel based on the presence / absence of the detection of the radar and the list, and to change the channel in use to a different channel when it is determined to change the channel A wireless communication program characterized by realizing a change function.

(Appendix 34)
When the identification signal reception function detects the radio wave of the radar, the identification signal reception function extracts detection information as to whether the other wireless communication device has detected the radar from the identification signal, and the identification information, the detection information, Is stored in the list storage unit,
The wireless communication according to claim 33, wherein the channel change function determines whether to change the channel being used to a different channel according to the detection information in the list when the radio wave of the radar is detected. program.

(Appendix 35)
The identification signal reception function periodically receives the identification signal, extracts detection information as to whether the other wireless communication device has detected the radar from the identification signal, and extracts the identification information and the detection information. Storing the associated list in the list storage unit;
The wireless communication program according to Supplementary Note 33 or Supplementary Note 34, wherein the channel change function determines whether to change the channel being used to a different channel based on the detection information in the list.

(Appendix 36)
The channel change function calculates the presence possibility of the radar based on the list, and determines whether to change the channel in use to a different channel based on the existence possibility. Alternatively, the wireless communication program according to attachment 35.

(Appendix 37)
The existence possibility is calculated by summing weighting factors for each of the identification information indicating that the detection information is detected,
37. The wireless communication program according to appendix 36, wherein the weighting factor is a real value greater than or equal to zero.

(Appendix 38)
The wireless communication program according to appendix 37, wherein the weighting coefficient is a reciprocal number of the identification information with the detection information.

(Appendix 39)
The identification signal receiving function periodically receives the identification signal and updates the list,
The wireless communication program according to any one of appendix 33 to appendix 38, wherein the channel change function determines whether to change the channel being used to a different channel according to the contents of the update of the list.

(Appendix 40)
The channel change function calculates the existence possibility of the radar based on the list, and determines whether to change the channel in use to a different channel based on the existence possibility. The wireless communication program described in 1.

(Appendix 41)
The possibility of existence is calculated by summing the weighting factors for each of the identification information that exists in the list before the update and does not exist in the list after the update,
The wireless communication program according to appendix 40, wherein the weighting factor is a real value greater than or equal to zero.

(Appendix 42)
The wireless communication program according to appendix 41, wherein the weighting factor is a reciprocal number of the identification information existing in the list before the update.

(Appendix 43)
When the channel change function calculates two or more types of the existence possibilities, the channel change function calculates a new existence possibility by adding a value obtained by multiplying each of the existence possibilities by a weighting factor. 43. The wireless communication program according to any one of Supplementary Note 36 to Supplementary Note 38 and Supplementary Note 40 to Supplementary Note 42, wherein whether or not to change the channel being used to a different channel is determined based on the existence possibility.

(Appendix 44)
From the supplementary note 36 to the supplementary note 38, the supplementary note 40, wherein the channel changing function determines that the channel being used is changed to a different channel when the possibility of existence is a predetermined first threshold value or more. 45. A wireless communication program according to any one of appendix 43.

(Appendix 45)
The channel change function determines that the channel being used is not changed to a different channel when the possibility of existence is equal to or less than a predetermined second threshold value. 45. The wireless communication program according to any one of appendix 44.

(Appendix 46)
On the computer,
46. The wireless communication program according to any one of appendix 33 to appendix 45, wherein an identification signal transmission function of transmitting detection information including whether or not the radio wave of the radar is detected is included in the identification signal.

(Appendix 47)
47. The wireless communication program according to appendix 46, wherein the identification signal transmission function transmits the identification signal without detecting the detection information when it is determined not to change the channel in use to a different channel.

(Appendix 48)
The wireless communication program according to any one of appendix 33 to appendix 47, wherein the identification signal is a beacon signal.

DESCRIPTION OF SYMBOLS 10, 20 Wireless communication apparatus 11 Radar detection part 12 Identification signal receiving part 13 List memory | storage part 14 Channel change part 25 Identification signal transmission part 40 Information processing apparatus

Claims (16)

A radar detection unit that detects the radio waves of the channel being used for wireless communication;
An identification signal receiving unit that extracts identification information of the other wireless communication device from an identification signal received from another wireless communication device that uses the channel, and stores a list of the identification information in a list storage unit;
A channel for determining whether to change the channel in use to a different channel based on the presence / absence of the detection of the radar and the list, and to change the channel in use to a different channel when it is determined to change the channel and a changing unit,
When the identification signal receiving unit detects the radio wave of the radar, the identification signal receiving unit extracts detection information as to whether or not the other wireless communication device has detected the radar from the identification signal, and the identification information and the detection information Is stored in the list storage unit,
The channel changing unit determines whether to change the channel being used to a different channel according to the detection information in the list when detecting the radio wave of the radar.
A wireless communication apparatus. The identification signal receiving unit periodically receives the identification signal, extracts detection information as to whether the other wireless communication device has detected the radar from the identification signal, and extracts the identification information and the detection information. Storing the associated list in the list storage unit;
The wireless communication apparatus according to claim 1, wherein the channel changing unit determines whether to change the channel being used to a different channel based on the detection information in the list.   A radar detection unit that detects the radio waves of the channel being used for wireless communication;
  An identification signal receiving unit that extracts identification information of the other wireless communication device from an identification signal received from another wireless communication device that uses the channel, and stores a list of the identification information in a list storage unit;
  A channel for determining whether to change the channel in use to a different channel based on the presence / absence of the detection of the radar and the list, and to change the channel in use to a different channel when it is determined to change Change part and
  With
  The identification signal receiving unit periodically receives the identification signal, extracts detection information as to whether the other wireless communication device has detected the radar from the identification signal, and extracts the identification information and the detection information. Storing the associated list in the list storage unit;
  The channel changing unit determines whether to change the channel in use to a different channel according to the detection information in the list.
  A wireless communication apparatus.   A radar detection unit that detects the radio waves of the channel being used for wireless communication;
  An identification signal receiving unit that extracts identification information of the other wireless communication device from an identification signal received from another wireless communication device that uses the channel, and stores a list of the identification information in a list storage unit;
  A channel for determining whether to change the channel in use to a different channel based on the presence / absence of the detection of the radar and the list, and to change the channel in use to a different channel when it is determined to change the channel Change part and
  With
  The identification signal includes the identification information of the other wireless communication device as a transmission source, and detection information as to whether the other wireless communication device has detected the radar,
  The channel change unit calculates the presence possibility of the radar based on the list, determines whether to change the channel in use to a different channel based on the existence possibility,
  The existence possibility is calculated by summing up weighting factors for each of the identification information indicating that the detection information is detected.
  A wireless communication apparatus.   A radar detection unit that detects the radio waves of the channel being used for wireless communication;
  An identification signal receiving unit that extracts identification information of the other wireless communication device from an identification signal received from another wireless communication device that uses the channel, and stores a list of the identification information in a list storage unit;
  A channel for determining whether to change the channel in use to a different channel based on the presence / absence of the detection of the radar and the list, and to change the channel in use to a different channel when it is determined to change the channel Change part and
  With
  The identification signal includes the identification information of the other wireless communication device of the transmission source,
  The identification signal receiving unit receives the identification signal and updates the list;
  The channel change unit calculates the presence possibility of the radar based on the list, determines whether to change the channel in use to a different channel based on the existence possibility,
  The possibility of existence is calculated by summing up weighting factors for each of the identification information that exists in the list before the update and does not exist in the list after the update.
  A wireless communication apparatus. 6. The channel change unit according to claim 4 or 5 , wherein the channel change unit determines to change from the currently used channel to a different channel when the possibility of existence is equal to or greater than a predetermined first threshold value. Wireless communication device. The channel changing unit, when the possible presence of more than a predetermined second threshold value, the claim 4, wherein the determining not to change to a different channel from the channel in the use of claim 6 Any one of the radio | wireless communication apparatuses. 8. The wireless communication apparatus according to claim 1, further comprising: an identification signal transmission unit configured to include detection information indicating whether the radio wave of the radar is detected in the identification signal. Detects the radar wave of the channel you are using for wireless communication,
When the radio wave of the radar is detected, the identification information of the other radio communication device from the identification signal received from the other radio communication device using the channel, and whether the other radio communication device has detected the radar. Detection information of whether or not, the list of identification information in which the identification information and the detection information are associated with each other is stored in a list storage unit,
When the radio wave of the radar is detected, it is determined whether to change the channel being used to a different channel based on the detection information of the list, and when the change is determined, the channel being used is different. A wireless communication method characterized by changing to a channel.   Detects the radar wave of the channel you are using for wireless communication,
  Extracting identification information of the other wireless communication device and detection information indicating whether or not the other wireless communication device has detected the radar from an identification signal periodically received from another wireless communication device using the channel And storing a list of the identification information in association with the identification information and the detection information in a list storage unit,
  It is determined whether to change the channel being used to a different channel based on the presence / absence of the detection of the radar and the detection information of the list, and when the change is determined, the channel being used is changed to a different channel. change
  A wireless communication method.   Detects the radar wave of the channel you are using for wireless communication,
  Extracting identification information of the other wireless communication device from an identification signal received from another wireless communication device using the channel, and storing a list of the identification information in a list storage unit;
  Calculating the presence of the radar based on the presence / absence of the radar and the list, determining whether to change the channel in use to a different channel based on the presence; If determined, change the channel in use to a different channel,
  The identification signal includes the identification information of the other wireless communication device as a transmission source, and detection information as to whether the other wireless communication device has detected the radar,
  The existence possibility is calculated by summing up weighting factors for each of the identification information indicating that the detection information is detected.
  A wireless communication method.   Detects the radar wave of the channel you are using for wireless communication,
  The identification information of the other wireless communication device is extracted from the identification signal received from another wireless communication device that uses the channel, the list of the identification information is stored in a list storage unit, the identification signal is received, Update the list
  Based on the presence / absence of the detection of the radar and the list, the presence possibility of the radar is calculated, and it is determined whether to change the channel in use to a different channel based on the existence possibility, and the change If so, change the channel in use to a different channel,
  The identification signal includes the identification information of the other wireless communication device of the transmission source,
  The possibility of existence is calculated by summing up weighting factors for each of the identification information that exists in the list before the update and does not exist in the list after the update.
  A wireless communication method. On the computer,
Radar detection function that detects the radar radio wave of the channel you are using in wireless communication,
An identification signal receiving function for extracting identification information of the other wireless communication device from an identification signal received from another wireless communication device using the channel, and storing a list of the identification information in a list storage unit;
A channel for determining whether to change the channel in use to a different channel based on the presence / absence of the detection of the radar and the list, and to change the channel in use to a different channel when it is determined to change the channel to realize the change function,
When the identification signal reception function detects the radio wave of the radar, the identification signal reception function extracts detection information as to whether the other wireless communication device has detected the radar from the identification signal, and the identification information, the detection information, Is stored in the list storage unit,
The channel change function determines whether to change the channel being used to a different channel according to the detection information in the list when the radio wave of the radar is detected.
A wireless communication program characterized by the above.   On the computer,
  Radar detection function that detects the radar radio wave of the channel you are using in wireless communication,
  An identification signal receiving function for extracting identification information of the other wireless communication device from an identification signal received from another wireless communication device using the channel, and storing a list of the identification information in a list storage unit;
  A channel for determining whether to change the channel in use to a different channel based on the presence / absence of the detection of the radar and the list, and to change the channel in use to a different channel when it is determined to change the channel Change function and
  Realized,
  The identification signal reception function periodically receives the identification signal, extracts detection information as to whether the other wireless communication device has detected the radar from the identification signal, and extracts the identification information and the detection information. Storing the associated list in the list storage unit;
  The channel change function determines whether to change the channel in use to a different channel according to the detection information in the list.
  A wireless communication program characterized by the above.   On the computer,
  Radar detection function that detects the radar radio wave of the channel you are using in wireless communication,
  An identification signal receiving function for extracting identification information of the other wireless communication device from an identification signal received from another wireless communication device using the channel, and storing a list of the identification information in a list storage unit;
  A channel for determining whether to change the channel in use to a different channel based on the presence / absence of the detection of the radar and the list, and to change the channel in use to a different channel when it is determined to change the channel Change function and
  Realized,
  The identification signal includes the identification information of the other wireless communication device as a transmission source, and detection information as to whether the other wireless communication device has detected the radar,
  The channel change function calculates the presence possibility of the radar based on the list, determines whether to change the channel in use to a different channel based on the existence possibility,
  The existence possibility is calculated by summing up weighting factors for each of the identification information indicating that the detection information is detected.
  A wireless communication program characterized by the above.   On the computer,
  Radar detection function that detects the radar radio wave of the channel you are using in wireless communication,
  An identification signal receiving function for extracting identification information of the other wireless communication device from an identification signal received from another wireless communication device using the channel, and storing a list of the identification information in a list storage unit;
  A channel for determining whether to change the channel in use to a different channel based on the presence / absence of the detection of the radar and the list, and to change the channel in use to a different channel when it is determined to change Change function and
  Realized,
  The identification signal includes the identification information of the other wireless communication device of the transmission source,
  The identification signal receiving function receives the identification signal and updates the list,
  The channel change function calculates the presence possibility of the radar based on the list, determines whether to change the channel in use to a different channel based on the existence possibility,
  The possibility of existence is calculated by summing up weighting factors for each of the identification information that exists in the list before the update and does not exist in the list after the update.
  A wireless communication program characterized by the above.

Images