TWI439148B - Wireless communication system and wireless communication method - Google Patents

Description

Wireless communication system and wireless communication method

The present invention relates to a wireless communication system including a wireless communication terminal and a relay device, and a wireless communication method.

In the 5 GHz band data communication in the wireless LAN, use 5.15 to 5.25 GHz band (36ch, 40ch, 44ch, 48ch), 5.25~5.35GHz band (52ch, 56ch, 60ch, 64ch), 5.5~5.7GHz band (100ch, 104ch) Frequency bands of 108ch, 112ch, 116ch, 120ch, 124ch, 128ch, 132ch, 136ch, and 140ch) (hereinafter, the 5.15 to 5.25 GHz band is the W52 band, and the 5.25 to 5.35 GHz band is the W53 band, which is called 5.5 to 5.7. The GHz band is for the W56 band.). When data communication is performed with the W53 tape and the W56 tape, it may coexist with the radar wave. Therefore, we require the wireless LAN access point to have a Dynamic Frequency Selection (DFS) function. However, the wireless LAN slave does not need to have DFS functionality. In this way, when a wireless LAN access point equipped with a DFS function such as a hidden terminal or an obstacle cannot detect a radar wave, the wireless LAN slave that performs data communication may continuously output a transmission wave and affect the radar wave.

Some people have planned a method to avoid the influence on radar waves by having the function of detecting a radar wave by a wireless LAN slave (refer to, for example, Document 1). In the method of Document 1, the wireless LAN access point cannot detect the radar wave due to the setting position or the like, and when the wireless LAN slave detects the radar wave, the user is notified by the image or the like, "Please change the setting position of the wireless LAN access point. Message.

[Document] Japanese Patent Publication No. 2009-303047

However, the wireless LAN slave that stops transmitting will not be able to restart communication by detecting the channel of the radar wave within a certain period of time. Therefore, when the wireless LAN access point has not changed the channel, it cannot be connected for a certain period of time.

The purpose of the present invention is to provide a wireless communication system and a wireless communication method, in which a wireless LAN access point cannot detect a radar wave, and when a wireless LAN slave detects a radar wave, the time for data communication interruption can be shortened. Restart communication.

A wireless communication system according to the present invention includes a wireless communication terminal and a relay device, wherein the wireless communication terminal includes: a first transmission/reception mechanism that transmits and receives data by wireless communication; and a first radio wave condition monitoring mechanism that monitors The radio wave condition of the communication channel and its surrounding channel memorizes the monitoring result; and when the first radio wave condition monitoring mechanism detects the radar wave, the first transmitting and receiving mechanism stops transmitting the wave, and transmits the channel information and the transmission channel to the relay device. In the change request, the relay device includes: a second transmitting and receiving unit that transmits and receives data by wireless communication; and a device control unit that receives the channel change request, that is, changes according to the channel The channel information of the wireless communication terminal is required to determine that the communication channel can be used in common by the wireless communication terminal and the relay device, and the communication channel is changed to be any one of the available channels.

The wireless communication method according to the present invention is implemented by a wireless communication system including a wireless communication terminal and a relay device, wherein the wireless communication terminal monitors a radio wave condition of a communication channel and a surrounding channel thereof, and generates a display channel according to the monitoring result. The channel information that can be used, the relay device monitors the radio wave condition of the communication channel and its surrounding channels, and generates channel information indicating whether the channel can be used according to the monitoring result. When the radio communication terminal detects the radar wave, the transmission wave is stopped. And transmitting the channel information to the relay device and transmitting the channel change request, and the relay device receives the channel change request, that is, according to the channel information of the wireless communication terminal attached to the channel change request, and the relay The channel information of the device is determined to be a channel that can be commonly used by the wireless communication terminal and the relay device, and the communication channel is changed to be any one of the available channels.

According to the invention, the wireless LAN access point cannot detect the radar wave, and when the wireless LAN slave detects the radar wave, the data communication interruption time can be shortened, and the communication can be restarted early.

[Embodiment 1.]

Hereinafter, a first embodiment of the present invention will be described with reference to the drawings.

Fig. 1 is an explanatory diagram showing an example of a wireless communication system.

The wireless communication system shown in FIG. 1 includes a wireless LAN slave 100 and a wireless LAN access point 200. The radar wave transmitter 300 is a device that transmits radar waves. In the present embodiment, the case where the wireless LAN access point 200 cannot receive the radar wave transmitted from the radar wave transmitter 300 due to the obstacle 400 is taken as an example.

The wireless LAN slave 100 has a function of detecting a radar wave (hereinafter referred to as a radar detecting function). The wireless LAN slave 100 is connected to the wireless LAN access point 200 via a wireless communication line. The wireless LAN slave 100 performs material communication with other devices via the wireless LAN access point 200.

The wireless LAN access point 200 performs material communication with a wireless communication terminal such as the wireless LAN slave 100 via a wireless communication line.

Next, the operation of this embodiment will be described with reference to Figs. 2, 3 and 4.

FIG. 2 is an explanatory diagram showing an example of the operation of the wireless LAN slave unit 100 in the first embodiment.

As shown in FIG. 2, the wireless LAN slave 100 and the wireless LAN access point 200 use the W53 band 52ch for data communication. When the wireless LAN slave 100 detects a radar wave in the material communication (step S201), the wireless transmission by the communication channel is stopped, and the wireless LAN access point 200 is requested to change the channel (step S202).

The configuration of the wireless LAN slave device 100 and the wireless LAN access point 200 shown in Figs. 1 and 2 will be described with reference to Figs. 3 and 4 .

Fig. 3 is a block diagram showing the configuration of the wireless LAN slave unit 100 in the first embodiment.

The wireless LAN slave 100 includes a transmission/reception antenna 101, an RF transmission/reception unit 102, an RF baseband unit 103, a control unit 104, a radio wave condition monitoring unit 105, a noise level determination unit 106, and an arithmetic processing unit 107.

The transmitting/receiving antenna 101 is an antenna for transmitting and receiving a band radio wave used for wireless communication with the wireless LAN access point 200.

The RF transmission/reception unit 102 transmits and receives a data communication. The RF data baseband section 103 modulates the demodulation and change communication data. The control unit 104 processes the data or controls each part.

The radio wave condition monitoring unit 105 monitors the surrounding radio wave condition every predetermined time during data communication. The radio wave condition monitoring unit 105 has a memory medium for storing data such as an SRAM, and memorizes the monitoring result of the radio wave condition. The memorized information is updated to the latest information at any time.

The noise level determining unit 106 determines whether or not the noise level of the channel is greater than a predetermined threshold based on the monitoring result of the radio wave condition stored in the radio wave condition monitoring unit 105. The arithmetic processing unit 107 calculates the logical product of the data.

Fig. 4 is a block diagram showing the configuration of the wireless LAN access point 200 in the first embodiment. The wireless LAN access point 200 includes a transmission/reception antenna 201, an RF transmission/reception unit 202, an RF baseband unit 203, a control unit 204, a radio wave condition monitoring unit 205, a noise level determination unit 206, and an arithmetic processing unit 207. The transmission/reception antenna 201, the RF transmission/reception unit 202, the RF baseband unit 203, the control unit 204, the radio wave condition monitoring unit 205, the noise level determination unit 206, and the arithmetic processing unit 207 have transmission and reception with the wireless LAN slave unit 100, respectively. The antenna 101, the RF transmission/reception unit 102, the RF baseband unit 103, the control unit 104, the radio wave condition monitoring unit 105, the noise level determining unit 106, and the arithmetic processing unit 107 have the same functions.

The operation of the wireless LAN slave 100 and the wireless LAN access point 200 shown in Fig. 2 will be described with reference to Fig. 5 .

Fig. 5 is a flow chart showing the operation of the wireless LAN slave device 100 and the wireless LAN access point 200 in the first embodiment.

The wireless LAN slave 100 performs material communication with the wireless LAN access point 200 using the W53 band 52ch (step S501). As shown in FIG. 1, the wireless LAN access point 200 is in a state in which the obstacle 400 cannot receive a radar wave.

The radio wave condition monitoring unit 105 of the wireless LAN slave unit 100 and the radio wave condition monitoring unit 205 of the wireless LAN access point 200 monitor the ambient radio wave condition every predetermined time during data communication, and memorize the monitoring result (step S502).

The radio wave condition monitoring unit 105 of the wireless LAN slave unit 100 confirms whether or not the radar wave is detected in the communication channel (52ch) in the material communication (step S503). When the radar wave is not detected (NO in step S503), the control unit 104 instructs the radio wave condition monitoring unit 105 to continue to monitor the surrounding radio wave condition. The radio wave condition monitoring unit 105 continues to monitor the surrounding power in response to the instruction. Wave condition. When the radar wave is detected (YES in step S503), the control unit 104 instructs the RF transmission/reception unit 102 to stop wireless transmission in the communication channel. The RF transmission/reception unit 102 stops transmitting wirelessly in the communication channel in response to the instruction (step S504).

Next, the control unit 104 starts generating channel information based on the latest information of the monitoring result stored in the radio wave condition monitoring unit 105 (step S505). The control unit 204 of the wireless LAN access point 200 also starts to generate channel information when the communication is interrupted by the associated wireless LAN slave 100.

Fig. 6 is an explanatory diagram for explaining arithmetic processing of channel information which can be used in the wireless LAN slave unit 100. The channel information that can be used shows whether each channel can be used. FIG. 7 is an explanatory diagram for explaining arithmetic processing of channel information that can be used by both the wireless LAN slave 100 and the wireless LAN access point 200.

The control unit 104 instructs the noise level determining unit 106 to determine whether or not the noise level of each channel noise level is greater than a predetermined threshold based on the radio condition monitoring result stored in the radio condition monitoring unit 105. The noise level determining unit 106 generates information for displaying the radio wave condition of each channel in response to the instruction. The noise level determining unit 106 generates information such as “0” when the noise level is larger than a predetermined threshold, and “1” when the noise level is smaller than a predetermined threshold. An example of information indicating that the latest radio wave condition of the wireless LAN slave unit 100 is generated by the noise level determining unit 106 is shown in FIG. 6(a). An example of information showing the latest radio wave condition of the wireless LAN access point 200 generated by the noise level determining unit 206 of the wireless LAN access point 200 is shown in FIG. 7(a). In the information shown in Fig. 6(a) and Fig. 7(a), the channel noise corresponding to "1" is small and can be used.

The control unit 104 confirms whether or not the channel of the W53 tape and the W56 tape is included in the channel usable in correspondence with "1" in the information shown in Fig. 6(a) (step S506).

When the control unit 104 confirms that the channel of the W53 band and the W56 band is included in the usable channel (YES in step S506), the radio wave condition monitoring unit 105 is "0" when the radar wave is detected, and when the radar wave is not detected, "1" generates information indicating the result of the radar wave detection confirmation of each channel (step S507). An example of the result of the radar wave detection confirmation is shown in Fig. 6(b). The control unit 104 instructs the arithmetic processing unit 107 to calculate the logical product of the information shown in Fig. 6(a) and the information shown in Fig. 6(b). The arithmetic processing unit 107 calculates a logical product in accordance with an instruction from the control unit 104 (step S508). The arithmetic processing unit 107 obtains the information and map shown in FIG. 6(a). The logical product of the information shown in 6(b) can be used to exclude the channel from which the radar wave is detected from the available channel. The result of the operation of the logical product is shown in Fig. 6(c). The control unit 104 uses the channel information that can be used by the wireless LAN slave device 100 as a result of the logical product calculation, and transmits it to the wireless LAN access point via the RF baseband unit 103, the RF transmission/reception unit 102, and the transmission/reception antenna 101 by active scanning. 200 (step S509). The processing of step S509 is equivalent to the channel change request of step S202.

When the control channel 104 does not include the W53 band and the W56 band channel (No in step S506), the information shown in FIG. 6(a) is the channel information that can be used by the wireless LAN slave device 100. The scan is transmitted to the wireless LAN access point 200.

When the control unit 204 of the wireless LAN access point 200 receives the available channel information from the wireless LAN slave unit 100, that is, the information is the latest channel information of the wireless LAN slave unit 100, the instruction arithmetic processing unit 207 executes the operation shown in FIG. Operation processing. An example of information showing the latest radio wave condition of the wireless LAN access point 200 is shown in FIG. 7(a). An example of the latest channel information of the wireless LAN slave 100 is shown in FIG. 7(b).

The arithmetic processing unit 207 calculates a logical product of the information shown in FIG. 7(a) and the information shown in FIG. 7(b) in response to an instruction from the control unit 204 (step S510). The result of the operation of the logical product is shown in Fig. 7(c). The calculation result shown in FIG. 7(c) is displayed on the channel information that can be commonly used by the wireless LAN slave 100 and the wireless LAN access point 200. As shown in FIG. 7(c), 3ch, 40ch, and 128ch are channels that can be used by both the wireless LAN slave 100 and the wireless LAN access point 200.

The control unit 204 of the wireless LAN access point 200 selects a change destination channel from the available channels shown in FIG. 7(c), and changes the channel (step S511). The control unit 104 of the wireless LAN slave 100 changes the channel to the channel after the change of the wireless LAN access point 200 (step S512). Further, the wireless LAN slave 100 is reconnected to the wireless LAN access point 200, and data communication is again possible (step S513).

In the present embodiment, even when the wireless LAN slave 100 detects the radar wave but the wireless LAN access point 200 does not detect the radar wave, the wireless LAN slave 100 that detects the radar wave can also cause the wireless LAN to be stored. Take point 200 to change the channel. As a result, the time until the communication is restarted can be shortened, and the communication interruption time can be shortened. Moreover, once the wireless LAN slave 100 detects the radar wave, the transmission wave is stopped, so that the transmission of the radar wave can be alleviated or prevented. Obstruction caused by interference.

In addition, as the channel to be changed when the radar wave is detected, the wireless LAN slave 100 and the wireless LAN access point 200 are selected to have a small noise channel. Therefore, the radio wave on the wireless LAN slave side can be avoided after the channel is changed. Although the situation is good, the radio wave status on the wireless LAN access point side is poor or the radio wave status on the wireless LAN access point side is good, but the radio wave status on the wireless LAN slave side is poor.

Moreover, when the radar wave is detected, the change destination channel does not include the channel for detecting the radar wave, so that the channel change does not occur when the change destination channel interferes with the device that transmits the radar wave.

Further, in the information shown in FIG. 7(c), when it is judged that there are few or no channels available, it is also possible to increase the threshold of the increase in the level of the noise level to determine the channel that can be used.

[Embodiment 2.]

Hereinafter, a second embodiment of the present invention will be described with reference to the drawings.

FIG. 8 is an explanatory diagram showing an example of the operation of the wireless LAN slave unit A100a and the wireless LAN slave unit B100b in the second embodiment.

As shown in FIG. 8, the wireless LAN slave A100a and the wireless LAN slave B100b having the radar detection function belong to the wireless LAN access point 200. In addition, although two wireless LAN slaves A100a and wireless LAN slaves B100b are illustrated in FIG. 8, a plurality of wireless LAN slaves may belong to the wireless LAN access point 200.

The wireless LAN slave A100a and the wireless LAN slave B100b perform data communication with the wireless LAN access point 200 using the W53 band 52ch. When the wireless LAN slave A100a and the wireless LAN slave B100b detect the radar wave in the data communication (step S801), the wireless transmission by the communication channel is stopped, and the wireless LAN access point 200 is required to change the channel (step S802).

The noise level determining unit 106 of the wireless LAN slave A100a and the wireless LAN slave B100b shown in FIG. 8 and the noise level determining unit 206 of the wireless LAN access point 200 determine whether the channel noise level is greater than the advance. In addition to the function of setting the threshold value, there is a function of generating information (hereinafter referred to as noise level comparison information) in which the channel number is stored in order from the smallest to the largest.

Wireless LAN slave A100a, wireless LAN slave B100b, and wireless LAN shown in FIG. The other configuration of the access point 200 is the same as that of the wireless LAN slave 100 and the wireless LAN access point 200 of the first embodiment, and therefore the description thereof is omitted.

The operation of the wireless LAN slave unit A100a, the wireless LAN slave unit B100b, and the wireless LAN access point 200 shown in Fig. 8 will be described with reference to Figs. 9 and 10 .

9 and 10 are flowcharts showing operations of the wireless LAN slave device A 100a, the wireless LAN slave device B 100b, and the wireless LAN access point 200 in the second embodiment.

The wireless LAN slave A100a and the wireless LAN slave B100b perform data communication with the wireless LAN access point 200 using the W53 band 52ch (step S901). As shown in FIG. 1, the wireless LAN access point 200 is in a state in which the obstacle 400 cannot receive a radar wave.

The radio wave condition monitoring unit 105 of the wireless LAN slave unit A100a and the wireless LAN slave unit B100b and the radio wave status monitoring unit 205 of the wireless LAN access point 200 monitor the surrounding radio waves every predetermined time in the data communication as in the first embodiment. Status, memory monitoring results.

When the radio wave status monitoring unit 105 of the wireless LAN slave unit A100a and the wireless LAN slave unit B100b detects a radar wave in the communication channel (52ch) during data communication (step S902), the control unit 104 stops the RF transmission/reception unit 102 from communicating. The channel is wirelessly transmitted (step S903).

When the wireless transmission processing is stopped, the control unit 104 of the wireless LAN slave unit A100a and the wireless LAN slave unit B100b starts generating channel information based on the latest monitoring result stored by each radio wave condition monitoring unit 105 (step S904). Further, the control unit 204 of the wireless LAN access point 200 starts generating channel information upon communication interruption with the associated wireless LAN slave A100a and wireless LAN slave B100b.

The channel information generation processing and transmission processing (steps S905 to S908) of the wireless LAN slave unit A100a and the wireless LAN slave unit B100b are the same as the processing of steps S506 to S509 of the wireless LAN slave unit 100 in the first embodiment, and thus the description thereof is omitted.

FIG. 11 is an explanatory diagram for explaining arithmetic processing of channel information that can be commonly used by the wireless LAN slave A100a, the wireless LAN slave B100b, and the wireless LAN access point 200.

When the control unit 204 of the wireless LAN access point 200 receives the channel information that can be used from the wireless LAN slave A100a and the wireless LAN slave B100b, the information is wireless. The latest channel information of the LAN slave A100a and the wireless LAN slave B100b causes the arithmetic processing unit 207 to execute the arithmetic processing shown in FIG.

An example of the latest channel information of the wireless LAN slave A100a is shown in Fig. 11(a). An example of the latest channel information of the wireless LAN slave B100b is shown in FIG. 11(b). An example of the latest channel information of the wireless LAN access point 200 is shown in FIG. 11(c).

The control unit 204 causes the arithmetic processing unit 207 to calculate the logical product of the information shown in Fig. 11(a) and the information shown in Fig. 11(c). And the logical product of the information shown in FIG. 11(b) and the information shown in FIG. 11(c) is calculated. The results of the logical product calculations are shown in Fig. 11 (d) and Fig. 11 (e), respectively. As shown in FIG. 11(d), 1ch and 40ch are channels that can be used by both the wireless LAN slave A100a and the wireless LAN access point 200. Further, as shown in FIG. 11(e), 136ch is a channel that can be used by both the wireless LAN slave B100b and the wireless LAN access point 200.

Further, the control unit 204 instructs the arithmetic processing unit 207 to calculate the logical product of the information shown in FIG. 11(d) and the information shown in FIG. 11(e). The arithmetic processing unit 207 calculates a logical product in accordance with the instruction of the control unit 104 (step S909). The result of the operation of the logical product is shown in Fig. 11(f). The calculation result shown in FIG. 11(f) is displayed on the channel information that can be commonly used by the wireless LAN slave A100a, the wireless LAN slave B100b, and the wireless LAN access point 200.

The control unit 204 of the wireless LAN access point 200 determines whether or not the usable channel exists based on the information shown in Fig. 11 (f) (step S910). When the channel is present (YES in step S910), the same processing as steps S511 to S513 in the first embodiment is performed (steps S911 to S913).

When the usable channel does not exist (NO in step S910), the control unit 204 of the wireless LAN access point 200 does not notify the wireless LAN slave A100a and the wireless LAN slave B100b that the channel change is not possible (step S1001). When the wireless LAN slave A100a and the wireless LAN slave B100b receive the channel change notification, each of the noise level determination units 106 determines each of the monitoring results of the latest radio wave condition stored in the radio wave condition monitoring unit 105. The noise level of the channel is determined (step S1002), and the noise level comparison information is generated (step S1003). Moreover, the wireless LAN access point 200 similarly generates the noise level comparison information. The wireless LAN slave A100a and the wireless LAN slave B100b respectively transmit the noise level comparison information to the wireless LAN access point 200 by active scanning (step S1004).

The control unit 204 of the wireless LAN access point 200 compares the information with the generated noise level. And the received noise level comparison information is the latest channel information to determine the change destination channel. FIG. 12 is an explanatory diagram showing an example of the noise level comparison information in the wireless LAN slave A 100a, the wireless LAN slave B 100b, and the wireless LAN access point 200. An example of the latest channel information in the wireless LAN slave A100a and the wireless LAN slave B100b is shown in FIGS. 12(a) and 12(b). An example of the latest channel information of the wireless LAN access point 200 is shown in FIG. 12(c).

The control unit 204 comprehensively determines the latest channel information of the wireless LAN slave A100a, the wireless LAN slave B100b, and the wireless LAN access point 200, and selects a channel whose noise level is considered small (step S1005). For example, the control unit 204 selects the channel with the smallest total value of the noise level indicated by the latest channel information. As an example, as shown in FIG. 12, the latest channel information of the wireless LAN slave A100a, the wireless LAN slave B100b, and the wireless LAN access point 200 is selected as "3", "1", and "4", respectively. The value is 140ch of the smallest "8" (enclosed by a circular mark in Fig. 12).

The control unit 204 changes the channel to the selected channel in step S1005 (step S1006). The control unit 104 of the wireless LAN slave A100a and the wireless LAN slave B100b changes the channel to the channel after the change of the wireless LAN access point 200 (step S1007). Further, the wireless LAN slave unit A100a and the wireless LAN slave unit B100b are reconnected to the wireless LAN access point 200, and data communication can be performed again (step S1008).

In the present embodiment, even when a plurality of wireless LAN slaves having a radar detecting function belong to the wireless LAN access point 200, the same effects as those of the first embodiment can be obtained.

Based on the noise level comparison information, the channel with relatively small noise level is selected as the change destination channel, so the change purpose can be selected even if the noise of all channels of the wireless LAN slave is greater than a preset threshold. Ground passage.

[Embodiment 3.]

Hereinafter, a third embodiment of the present invention will be described with reference to the drawings.

Fig. 13 is an explanatory view showing an example of the operation of the wireless LAN slave unit 100 in the third embodiment.

As shown in FIG. 13, the wireless LAN slave 100 having the radar detection function and the wireless LAN slaves 601 to 604 having no radar detection function belong to the wireless LAN access point 200. The wireless LAN slave 100 and the wireless LAN slaves 601 to 604 respectively use the 52ch with the W53 The wireless LAN access point 200 performs data communication.

When the wireless LAN slave 100 detects the radar wave in the material communication (step S1301), the wireless transmission by the communication channel is stopped, and the wireless LAN access point 200 is required to change the channel (step S1302). The wireless LAN access point 200 receives the channel change request from the wireless LAN slave unit 100, and the operation of determining the change destination channel is the same as that in the first embodiment, and thus the description thereof is omitted. Hereinafter, an operation after the wireless LAN access point 200 determines to change the destination channel will be described.

Fig. 14 is a flow chart showing the operation of the wireless LAN access point 200 in the third embodiment.

When the control unit 204 of the wireless LAN access point 200 determines to change the destination channel (step S1401), the channel is changed, and the channel change notification is transmitted to the wireless LAN slaves 601 to 604 (step S1402). The channel change notification contains information showing the change destination channel.

Upon receiving the channel change notification, the wireless LAN slaves 601 to 604 change the channel based on the notification (step S1403). In the same manner as in the first embodiment, the wireless LAN slave 100 changes the channel to the channel after the wireless LAN access point 200 is changed.

Further, the wireless LAN slave device 100 and the wireless LAN slave devices 601 to 604 are reconnected to the wireless LAN access point 200, and data communication can be performed again (step S1404).

In the present embodiment, as long as there is one wireless LAN slave having the radar detection function in the wireless LAN slave belonging to the wireless LAN access point 200, all the wireless LANs belonging to the wireless LAN access point 200 can be changed. The channel of the sub-machine can reduce or prevent interference with the equipment that transmits the radar wave.

Further, the channel change notification in step S1402 should be implemented by the function of the existing wireless LAN access point. In this case, the wireless LAN slave other than the wireless LAN slave 100 having the radar detecting function can be applied to the present embodiment even if it is a conventional wireless LAN slave.

[Embodiment 4.]

Hereinafter, a fourth embodiment of the present invention will be described with reference to the drawings.

Fig. 15 is an explanatory view showing an example of the operation of the wireless LAN slave unit 100 in the fourth embodiment.

As shown in FIG. 15, the wireless LAN slave 100 having the radar detecting function and the wireless LAN access point 200 perform data communication using the 52ch of the W53 band. Wireless LAN slave 100 once The radar wave is detected in the data communication (step S1501), and the wireless LAN slave 100 generates a radar wave other than the detected radar wave (step S1502), and transmits the generated radar wave to the wireless LAN access point 200. (Step S1503).

The configuration of the wireless LAN slave unit 100 shown in Fig. 15 will be described with reference to Fig. 16 . Fig. 16 is a block diagram showing the configuration of the wireless LAN slave unit 100 in the fourth embodiment.

The wireless LAN slave 100 includes a transmission/reception antenna 101, an RF transmission/reception unit 102, an RF baseband unit 103, a control unit 104, a radar wave determination unit 110, a radar wave generation unit 111, and a radar wave storage unit 112.

Since the functions of the transmission/reception antenna 101, the RF transmission/reception unit 102, the RF baseband unit 103, and the control unit 104 are the same as those of the first embodiment, the description thereof is omitted.

The radar wave determination unit 110 determines which type of radar wave the detected radar wave system is. The radar wave generation unit 111 generates a virtual radar wave based on the result of the determination by the radar wave determination unit 110. The radar wave memory unit 112 memorizes the waveform pattern of all radar waves present in the 5 GHz band.

Figure 17 is a diagram for explaining the radar wave existing in the W53 band. As shown in Fig. 17 (a), there are Category 1 and Category 2, 2 types of radar waves in the W53 band. The waveform of the Category 1 radar wave is shown in Fig. 17(b). The waveform of the Category 2 radar wave is shown in Fig. 17(c).

The operation of the wireless LAN slave 100 and the wireless LAN access point 200 shown in Fig. 15 will be described with reference to Fig. 18 . Fig. 18 is a flow chart showing the operation of the wireless LAN slave unit 100 and the wireless LAN access point 200 in the fourth embodiment.

The wireless LAN slave 100 performs material communication with the wireless LAN access point 200 using the W53 band 52ch (step S1801). As shown in FIG. 1, the wireless LAN access point 200 is in a state in which the obstacle 400 cannot receive a radar wave.

When the radar wave determination unit 110 of the wireless LAN slave unit 100 detects a radar wave in the communication channel (52ch) in the material communication (step S1802), the control unit 104 of the wireless LAN slave unit 100 instructs the radar wave determination unit 110 to determine the Detector. The measured radar wave system category 1 is also category 2. The radar wave determination unit 110 determines the detected radar wave system type 1 or category 2 in response to an instruction from the control unit 104 (step S1803). In the processing of step S1803, the radar wave determination unit 110 determines the type of the detected radar wave based on the radar wave waveform pattern stored in the radar wave storage unit 112. The control unit 104 is known by the radar wave determination unit 110. When the detected radar wave system type 1 (YES in step S1803), the radar wave generating unit 111 is instructed to generate the radar wave of the category 2. The radar wave determination unit 110 generates a radar wave of category 2 in response to an instruction from the control unit 104 (step S1804). When the detected radar wave system type 2 is NO (NO in step S1803), the radar wave generation unit 111 generates the radar wave of the category 1 (step S1805).

The control unit 104 transmits the radar wave generated by the radar wave generation unit 111 to the wireless LAN access point 200 via the RF baseband unit 103, the RF transmission/reception unit 102, and the transmission/reception antenna 101 (step S1806).

The radio wave condition monitoring unit 205 of the wireless LAN access point 200 detects the radar wave (step S1807), and activates the DFS function (step S1808).

By changing the channel of the wireless LAN access point and the wireless LAN slave by the DFS function, the wireless LAN access point is reconnected to the wireless LAN slave, and data communication is again possible.

In the present embodiment, even if the wireless LAN access point 200 does not have the configuration shown in FIG. 4, the wireless LAN slave 100 that detects the radar wave can cause the wireless LAN to be stored as long as the existing radar detection function and the DFS function are provided. Take point 200 to change the channel.

Further, the radar wave determination unit 110 of the wireless LAN slave unit 100 can monitor the RSSI (Recievc Signal Strength Indication) of the wireless LAN access point 200, adjust the transmission power of the RF transmission/reception unit 102, and set the RSSI to be a wireless LAN. The access point 200 can detect the minimum power of the radar wave. According to this configuration, the influence of the radar wave emitted from the radar wave transmitting device can be alleviated.

Further, the transmitting and receiving antenna 101 of the wireless LAN slave 100 can also use a directional antenna. According to this configuration, the wireless LAN slave 100 can transmit the generated radar wave in the direction in which the device for transmitting the radar wave exists, and transmits only in the direction in which the wireless LAN access point 200 exists, so that the radar transmitted to the radar wave transmitting device can be further alleviated. The influence of waves.

In the present embodiment, the radar wave of the W53 band is taken as an example. However, when other bands, such as the W56 band radar wave, are detected, the radar wave having different waveform patterns in the radar wave existing in the W56 band is generated and transmitted. Just fine.

Figure 19 is a block diagram showing the main parts of a wireless communication system in accordance with the present invention. As shown in FIG. 19, the wireless communication system includes a wireless communication terminal device 10 (corresponding to the wireless LAN slave device 100 shown in FIG. 1 or the wireless LAN slave device A100a and the wireless LAN slave device shown in FIG. B100b) and relay device 20 (corresponding to wireless LAN access point 200 shown in FIGS. 1 and 8), characterized in that wireless communication terminal device 10 includes: first transmitting and receiving unit 11, transmitting and receiving by wireless communication Data (corresponding to the transmitting/receiving antenna 101, the RF transmitting and receiving unit 102, and the RF baseband unit 103 shown in FIG. 3); and the first radio wave condition monitoring unit 12, monitoring the radio wave condition of the communication channel and its surrounding channels, and memorizing the monitoring result ( Corresponding to the radio wave condition monitoring unit 105) shown in FIG. 3; when the first radio wave condition monitoring unit 12 detects a radar wave, the first transmitting and receiving unit 11 stops transmitting the wave, and transmits the channel information to the relay device 20 and The relay device 20 transmits a channel change request, and the relay device 20 includes a second transmission/reception mechanism 21 that transmits and receives data by wireless communication (corresponding to the transmission/reception antenna 201, the RF transmission/reception unit 202, and the RF base shown in FIG. The frequency band unit 203); and the device control unit 22, when receiving the channel change request, the second communication receiving unit 21 determines the wireless communication terminal based on the channel information of the wireless communication terminal 10 attached to the channel change request. 20 may be used in common for the channel 10 and the relay apparatus, a communication channel to be used to change any of the channels of a channel (corresponding to the control unit 204 shown in FIG. 4).

In the above embodiment, a wireless communication system as below is also disclosed.

(1) A wireless communication system, wherein the wireless communication terminal includes a first noise level determining means for generating channel information indicating whether the display channel is usable according to the monitoring result of the first radio wave condition monitoring means (corresponding to the miscellaneous shown in FIG. The relay level determining unit 106) includes a second radio wave condition monitoring unit that monitors radio wave conditions of the communication channel and its surrounding channels, and memorizes the monitoring result (corresponding to the radio wave condition monitoring unit 205 shown in FIG. 4); (2) The noise level determining means generates channel information (corresponding to the noise level determining unit 206 shown in FIG. 4) of whether or not the display channel is usable based on the monitoring result of the second radio wave condition monitoring means; and the first radio wave condition monitoring The monitoring result of the mechanism and the monitoring result of the second radio wave condition monitoring mechanism include information indicating the channel noise level, and the device control unit judges the radio communication terminal and the relay according to the channel information generated by the second noise level judging mechanism. The channel that can be commonly used by the device, and the first noise level judging machine when the noise level included in the monitoring result of the first radio condition monitoring mechanism is less than a preset threshold The configuration determines that the channel is a usable channel, and the second noise level judging machine when the noise level included in the monitoring result of the second radio condition monitoring mechanism is less than a preset threshold The structure determines that the channel is a usable channel.

(2) A wireless communication system, wherein the first radio wave condition monitoring unit 12 generates a radar wave detection confirmation result indicating whether a radar wave is detected in the communication channel and its surrounding channels, and determines the detected result based on the radar wave detection confirmation result. The channel of the radar wave, the terminal device further includes a channel information updating mechanism to detect that the radar wave channel is an unusable channel update channel information (corresponding to the control unit 104 shown in FIG. 3), and the second radio wave condition monitoring mechanism generates Whether the radar wave detection confirmation result of the radar wave is detected on the communication channel and its surrounding channels is displayed, and the device control mechanism determines the channel of the radar wave detected based on the radar wave detection confirmation result to detect the radar wave channel. Update channel information for channels that are not available.

(3) A wireless communication system, wherein the channel information includes a noise level comparison information indicating a result of comparing the noise levels of each channel, and the device control unit 22 determines the wireless communication terminal device 10 based on the noise level comparison information. The channel of the relay device 20 with relatively small noise levels determines that the channel is a usable channel.

(4) A wireless communication system in which a second transmission/reception mechanism transmits a channel change request according to a channel change request to a wireless communication terminal unit belonging to the relay device 20 upon receiving a channel change request.

(5) A wireless communication system, the wireless communication terminal 10 includes: a radar wave memory mechanism, a memory radar wave waveform pattern (corresponding to the radar wave memory unit 112 shown in FIG. 16); a radar wave determining mechanism that detects a radar wave, The type of the detected radar wave is determined based on the radar wave pattern (corresponding to the radar wave determining unit 110 shown in FIG. 16); and the radar wave generating mechanism generates the radar wave (corresponding to the radar wave shown in FIG. 16) The generating unit 111); and the radar wave generating means generates a radar wave of another type different from the type determined by the radar wave determining means, and the first transmitting and receiving means 11 transmits the radar wave generated by the radar wave generating means to the relay device 20.

The present invention has been described above with reference to the embodiments and examples, but the present invention is not limited by the above embodiments and examples. A person skilled in the art can make various modifications to the structure or details of the present invention within the scope of the present invention.

This application claims Japanese patent application filed on January 18, 2011 Based on the priority of 2011-8068, all the disclosures thereof are incorporated herein.

S201~S202‧‧‧Steps

S501~S513‧‧‧Steps

S801~S802‧‧‧Steps

S901~S913‧‧‧Steps

S1001~S1008‧‧‧Steps

S1301~S1303‧‧‧Steps

S1401~S1404‧‧‧Steps

S1501~S1503‧‧‧Steps

S1801~S1808‧‧‧Steps

10‧‧‧Wireless communication terminal

11‧‧‧1st sending and receiving organization

12‧‧‧1st radio condition monitoring agency

20‧‧‧Relay device

21‧‧‧2nd sending and receiving organization

22, 24‧‧‧ device control mechanism

23‧‧‧2nd noise level judging agency

100, 601~604‧‧‧Wireless LAN

100a‧‧‧Wireless LAN Submachine A

100b‧‧‧Wireless LAN Sub-B

101, 201‧‧‧ transmit and receive antenna

102, 202‧‧‧RF Transmitting and Receiving Department

103, 203‧‧‧RF baseband

104, 204‧‧‧Control Department

105, 205‧‧‧ Radio Wave Condition Monitoring Department

106, 206‧‧‧ Noise Level Judgment Department

107, 207‧‧‧Operation Processing Department

110‧‧‧Radar wave judgment department

111‧‧‧Radar wave generation department

112‧‧‧Radar wave memory

200‧‧‧Wireless LAN access point

300‧‧‧Radar wave transmitter

400‧‧‧ obstacles

Fig. 1 is an explanatory diagram showing an example of a wireless communication system.

Fig. 2 is an explanatory view showing an example of the operation of the wireless LAN slave in the first embodiment.

Fig. 3 is a block diagram showing the configuration of a wireless LAN slave unit in the first embodiment.

Fig. 4 is a block diagram showing the configuration of a wireless LAN access point in the first embodiment.

Fig. 5 is a flow chart showing the operation of the wireless LAN slave and the wireless LAN access point in the first embodiment.

Fig. 6 is an explanatory diagram for explaining arithmetic processing of channel information which can be used in a wireless LAN slave.

Fig. 7 is an explanatory diagram for explaining arithmetic processing of channel information which can be used by both the wireless LAN slave and the wireless LAN access point.

FIG. 8 is an explanatory diagram showing an example of the operation of the wireless LAN slave unit A and the wireless LAN slave unit B in the second embodiment.

Fig. 9 is a flow chart showing the operation of the wireless LAN slave unit A, the wireless LAN slave unit B, and the wireless LAN access point in the second embodiment.

Fig. 10 is a flow chart showing the operation of the wireless LAN slave unit A, the wireless LAN slave unit B, and the wireless LAN access point in the second embodiment.

Fig. 11 is an explanatory diagram for explaining arithmetic processing of channel information which can be commonly used in the wireless LAN slave A, the wireless LAN slave B, and the wireless LAN access point.

FIG. 12 is an explanatory diagram showing an example of the wireless LAN slave A, the wireless LAN slave B, and the wireless LAN access point noise level comparison information.

Fig. 13 is an explanatory diagram showing an example of the operation of the wireless LAN slave and the wireless LAN access point in the third embodiment.

Fig. 14 is a flow chart showing the operation of the wireless LAN access point in the third embodiment.

Fig. 15 is an explanatory view showing an example of the operation of the wireless LAN slave in the fourth embodiment.

Fig. 16 is a block diagram showing the configuration of a wireless LAN slave unit in the fourth embodiment.

Figure 17 is a diagram for explaining the radar wave existing in the W53 band.

Figure 18 is a diagram showing the wireless LAN slave and the wireless LAN access point in the fourth embodiment. Flow chart.

Figure 19 is a block diagram showing the main parts of a wireless communication system in accordance with the present invention.

S501~S513‧‧‧Steps

Claims (10)

A wireless communication system includes a wireless communication terminal and a relay device, wherein the wireless communication terminal includes: a first transmitting and receiving unit that transmits and receives data by wireless communication; and a first radio wave condition monitoring mechanism that monitors the communication channel The radio wave condition of the surrounding channel memorizes the monitoring result; and when the first radio wave condition monitoring mechanism detects the radar wave, the first transmitting and receiving mechanism stops transmitting the wave, and transmits the channel information to the relay device and transmits the channel change request. The relay device includes: a second transmitting and receiving unit that transmits and receives data by wireless communication; and a device control unit that receives the channel change request, that is, according to the channel change request The channel information of the wireless communication terminal is determined to be a channel that can be commonly used by the wireless communication terminal and the relay device, and the communication channel is changed to be any one of the available channels. The wireless communication system according to claim 1, wherein the wireless communication terminal has a first noise level determining unit that generates channel information indicating whether the channel is usable according to a monitoring result of the first radio condition monitoring unit. The relay device includes: a second radio wave condition monitoring unit that monitors a radio wave condition of the communication channel and its surrounding channels, and memorizes the monitoring result; and the second noise level judging means generates a display based on the monitoring result of the second radio wave condition monitoring means Whether the channel information is available for the channel, and the monitoring result of the first radio condition monitoring unit and the monitoring result of the second radio condition monitoring unit include information indicating the channel noise level, and the device control unit is based on the second noise The channel information generated by the level judging unit is determined to be a channel that can be commonly used by the radio communication terminal and the relay device, and the noise level included in the monitoring result of the first radio condition monitoring unit is less than a preset threshold The first noise level judging mechanism judges that the channel can use the channel. When the noise level included in the monitoring result of the second radio condition monitoring means is smaller than a predetermined threshold, the second noise level determining means determines that the channel is usable. For example, in the wireless communication system of claim 2, the first radio condition monitoring mechanism generates a radar wave detection confirmation result indicating whether a radar wave is detected in the communication channel and its surrounding channels, and the terminal device further includes channel information. An update mechanism that determines a channel for detecting a radar wave based on the radar wave detection confirmation result, to detect that the channel of the radar wave is an unusable channel update channel information, and the second electric wave condition monitoring mechanism generates and displays Whether the communication channel and its surrounding channels detect the radar wave detection confirmation result of the radar wave, and the device control mechanism determines the channel for detecting the radar wave based on the radar wave detection confirmation result to detect the radar wave channel Update channel information for channels that are not available. For example, in the wireless communication system of claim 1, wherein the channel information includes a noise level comparison information indicating a result of comparing the noise level of each channel, and the device control unit determines the information according to the noise level comparison information. The wireless communication terminal and the channel of the relay device have relatively small noise levels, and it is determined that the channel can use the channel. For example, in the wireless communication system of claim 2, wherein the channel information includes a noise level comparison information indicating a result of comparing the noise level of each channel, and the device control unit determines the information according to the noise level comparison information. The wireless communication terminal and the channel of the relay device have relatively small noise levels, and it is determined that the channel can use the channel. For example, in the wireless communication system of claim 3, wherein the channel information includes a noise level comparison information indicating a result of comparing the noise level of each channel, and the device control unit determines the information according to the noise level comparison information. The wireless communication terminal and the channel of the relay device have relatively small noise levels, and it is determined that the channel can use the channel. A wireless communication system according to any one of claims 1 to 6, wherein Upon receiving the channel change request, the second transmitting and receiving unit transmits a channel change notification according to the channel change request to the wireless communication terminal device belonging to the relay device. The wireless communication system of claim 1, wherein the wireless communication terminal comprises: a radar wave memory mechanism, a memory radar wave waveform pattern, a radar wave determining mechanism, and a radar wave is detected, and the radar wave waveform pattern is used as a basis for determining a type of the detected radar wave; and a radar wave generating mechanism that generates a radar wave; and the radar wave generating mechanism generates a radar wave of a different type from the type determined by the radar wave determining unit, the first transmitting and receiving unit The relay device transmits the radar wave generated by the radar wave generating mechanism. The wireless communication system of claim 2, wherein the wireless communication terminal comprises: a radar wave memory mechanism, a memory radar wave waveform pattern; a radar wave determining mechanism, detecting a radar wave, and determining based on the radar wave waveform pattern a type of the detected radar wave; and a radar wave generating mechanism that generates a radar wave; and the radar wave generating mechanism generates a radar wave of a different type from the type determined by the radar wave determining unit, the first transmitting and receiving unit The relay device transmits the radar wave generated by the radar wave generating mechanism. A wireless communication method is implemented by a wireless communication system including a wireless communication terminal and a relay device, wherein the wireless communication terminal monitors a radio wave condition of a communication channel and a surrounding channel thereof, and generates a display channel according to the monitoring result. Channel information, the relay device monitors the radio wave condition of the communication channel and its surrounding channels, and generates channel information indicating whether the channel can be used according to the monitoring result. When the radio communication terminal detects the radar wave, the transmission wave stops, and The relay device transmits channel information and transmits a channel change request, and the relay device receives the channel change request, that is, according to the channel information of the wireless communication terminal attached to the channel change request, and the relay device The channel information is determined to be a channel that can be commonly used by the wireless communication terminal and the relay device, and the communication channel is changed to be any one of the available channels.