JP2016092431A - Radio communication equipment and radio communication method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent the quality of radio communication from continuously deteriorating due to the change of a radio wave situation.SOLUTION: Radio communication equipment 1 for performing radio communication by a point-to-point radio communication system adopting an FDD system includes: an investigation part 2; an information acquisition part 3; a determination part 4; and a synchronization part 5. The investigation part 2 is configured to investigate the noise level of a reception signal over the whole region of a reception frequency band. The information acquisition part 3 is configured to transmit the noise level investigation information of the reception frequency band based on the investigation result of the investigation part 2 to a communication partner 7. The information acquisition part 3 is configured to acquire the noise level investigation information of the reception frequency band transmitted from the communication partner 7 as the noise level investigation information of the transmission frequency band. The determination part 4 is configured to, when the quality of the reception signal deteriorates more than a change deterioration state, determine the change candidate of communication setting to improve the signal quality. The synchronization part 5 is configured to transmit the change candidate of communication setting to the communication partner 7 to synchronize with the communication partner 7 as for the change of communication setting.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a communication technique in a point-to-point wireless communication system employing a frequency division duplex (FDD) system.

  As one of the wireless communication systems, there is a point-to-point wireless communication system that employs an FDD (frequency division multiplexing) system. In the point-to-point communication mode, the wireless communication apparatus is set (fixed) with a communication partner for wireless communication. In addition, by adopting the FDD method for communication between a pair of wireless communication devices that communicate in the point-to-point wireless communication mode, the wireless communication devices of these pairs can efficiently perform mutual communication. . That is, here, one of a pair of wireless communication devices that communicate in a point-to-point wireless communication mode is represented as a wireless communication device A, and the other is represented as a wireless communication device B. In the FDD scheme, the frequency of radio waves for transmitting signals from the wireless communication device A to the wireless communication device B is different from the frequency of radio waves for transmitting signals from the wireless communication device B to the wireless communication device A. For this reason, the transmission of the signal from the wireless communication apparatus A to the wireless communication apparatus B and the reverse transmission of the signal from the wireless communication apparatus B to the wireless communication apparatus A can be performed simultaneously.

  By the way, normally, when the wireless communication devices A and B perform wireless communication using the point-to-point wireless communication system, the wireless communication devices A and B acquire a use license for the wireless frequency band used for communication. Further, the frequency interval between the frequency of the radio wave transmitted from the wireless communication apparatus A to the radio communication apparatus B and the frequency of the radio wave transmitted from the radio communication apparatus B to the radio communication apparatus A is defined.

  As described above, the use of the radio frequency band used for the radio communication between the radio communication devices A and B is a permission system. For this reason, when installing a new wireless communication device, based on the status of granting the use license of the radio frequency band, the installer of the device must confirm the radio wave condition of the new installation location before installing the wireless communication device. Can be guessed. Thereby, the installer of the apparatus prevents the problem that the quality of the wireless communication is deteriorated due to the radio wave interference due to the adjustment of the antenna or the change of the wireless route.

  Patent Document 1 discloses a technique related to wireless communication using a CSMA / CA (Carrier Sense Multiple Access with Collision Avoidance) method. Further, Patent Document 2 discloses that communication can be performed on a wide bandwidth channel with an increased modulation degree by performing communication with a modulation degree as high as possible or a wide bandwidth according to a wireless communication apparatus of a communication partner, and interference noise. A technique for providing a wireless communication device that is resistant to damage is disclosed.

JP 2013-187847 A JP 2005-303765 A

  As described above, when a wireless communication device is newly installed, the installer of the device installs the wireless communication device so that the quality of wireless communication is good. However, despite the installation of the wireless communication device, the quality of the wireless communication (noise status, etc.) in the wireless communication device has subsequently deteriorated due to radio wave interference due to changes in the radio wave conditions at the installation location. May occur.

  The present invention has been devised to solve the above problems. A main object of the present invention is to provide a technique for preventing the quality of wireless communication from continuously deteriorating due to a change in the radio wave condition by changing the communication setting according to the change in the radio wave condition. .

In order to achieve the above object, a wireless communication device of the present invention provides:
An investigation unit that investigates the noise level of the received signal over the entire reception frequency band that is predetermined as a frequency band for receiving a signal by wireless communication;
A reception channel having a reception frequency and a bandwidth set in the reception frequency band and a transmission channel having a transmission frequency and a bandwidth set in a transmission frequency band predetermined as a frequency band for transmitting a signal are used. The noise level investigation information of the reception frequency band based on the investigation result of the investigation unit is transmitted to a predetermined communication partner that performs wireless communication, and the reception transmitted from the communication partner is performed. An information acquisition unit for acquiring noise level investigation information of a frequency band as noise level investigation information of the transmission frequency band;
When the quality of the received signal is worse than a predetermined change determination state, the quality of the signal by wireless communication is determined based on the noise level investigation information of the reception frequency band and the noise level investigation information of the transmission frequency band. In order to improve, a determination unit that determines a candidate for change of communication setting that is a basis of wireless communication,
A synchronization unit that synchronizes with the communication partner regarding the change of the communication setting by transmitting the communication setting change candidate to the communication partner;

The wireless communication method of the present invention includes
Investigate the noise level of the received signal over the entire reception frequency band that is predetermined as the frequency band for receiving signals by wireless communication,
A reception channel having a reception frequency and a bandwidth set in the reception frequency band and a transmission channel having a transmission frequency and a bandwidth set in a transmission frequency band predetermined as a frequency band for transmitting a signal are used. And transmitting noise level investigation information of the reception frequency band based on the investigation result to a predetermined communication partner that performs wireless communication, and noise level investigation of the reception frequency band from the communication partner Information is acquired as noise level investigation information of the transmission frequency band,
When the quality of the received signal is worse than a predetermined change determination state, wireless communication is performed based on the noise level investigation information of the reception frequency band and the noise level investigation information of the transmission frequency band by the information acquisition unit. In order to improve the quality of the signal by deciding the candidate for changing the communication setting that is the basis of wireless communication,
By transmitting the communication setting change candidate to the communication partner, the communication setting change is synchronized with the communication partner.

  According to the present invention, it is possible to prevent the quality of wireless communication from continuously deteriorating due to the change in the radio wave condition by changing the communication setting according to the change in the radio wave condition.

It is a block diagram which simplifies and represents the structure of the radio | wireless communication apparatus of 1st Embodiment which concerns on this invention. It is a block diagram which simplifies and represents the structure of the radio | wireless communication apparatus of 2nd Embodiment which concerns on this invention. It is a figure explaining the specific example which changes communication setting. It is a figure showing the example of a specific pattern of a noise level for every cause of deterioration when a noise level deteriorates. It is a flowchart showing an example of the change operation | movement of a communication setting in the radio | wireless communication apparatus of 2nd Embodiment. It is a figure explaining the specific example which changes a communication setting according to the condition change of a noise level. It is a figure explaining the frequency position which investigates a noise level intermittently. It is a figure explaining other embodiment. It is a figure explaining other another embodiment. It is a figure explaining other other embodiment.

  Embodiments according to the present invention will be described below with reference to the drawings.

<First Embodiment>
FIG. 1 is a block diagram showing a simplified configuration of the wireless communication apparatus according to the first embodiment of the present invention. The wireless communication device 1 of the first embodiment is a device that performs wireless communication using a point-to-point wireless communication method that employs an FDD (frequency division multiplexing) method. That is, the wireless communication device 7 with which the wireless communication device 1 communicates is preset (fixed). In addition, a transmission frequency band used when a signal is transmitted from the wireless communication apparatus 1 to the wireless communication apparatus 7 that is a communication partner, and a reception frequency band used when the wireless communication apparatus 1 receives a signal from the wireless communication apparatus 7 Are different from each other in advance. Usually, a reception frequency band is divided into a plurality of regions as channels, and a channel selected from these divided regions (channels) is used as a reception channel. Similarly, the transmission frequency band is divided into a plurality of areas as channels, and a channel selected from these divided areas (channels) is used as the transmission channel. The reception channel is set according to the reception frequency (that is, the center frequency of the reception channel) and the bandwidth. The transmission channel is set by the transmission frequency (that is, the center frequency of the transmission channel) and the bandwidth.

  In the first embodiment, the wireless communication device 1 and the wireless communication device 7 that is the communication partner have the following common configuration. That is, the wireless communication device 1 (wireless communication device 7) includes a survey unit 2, an information acquisition unit 3, a determination unit 4, and a synchronization unit 5 as a common configuration.

  The investigation unit 2 has a function of investigating the noise level of the received signal over the entire predetermined reception frequency band.

  The information acquisition unit 3 has a function of transmitting noise level survey information in the reception frequency band based on the survey result of the survey unit 2 toward a predetermined wireless communication device 7 as a communication partner. Further, the information acquisition unit 3 has a function of acquiring the noise level investigation information of the reception frequency band transmitted from the wireless communication device 7 of the communication partner as the noise level investigation information of the transmission frequency band.

  The determination unit 4 has a function of determining communication setting change candidates that are the basis of signal wireless communication when the quality of the received signal is worse than a predetermined change determination state. That is, the determination unit 4 determines communication setting change candidates based on the reception frequency band noise level investigation information and the transmission frequency band noise level investigation information in order to improve the signal quality of the wireless communication. The signal quality here represents how accurately the signal can convey information. For example, the signal quality deteriorates due to a deterioration in the noise level of the signal, an increase in the attenuation of the signal level due to propagation (transmission), or the like. The communication settings include, for example, a center frequency (reception frequency, transmission frequency) for setting a reception channel or a transmission channel, a bandwidth thereof, a signal modulation method when a signal is transmitted, and the like.

  The synchronization unit 5 has a function of synchronizing the communication setting change candidate with the communication partner wireless communication device 7 by transmitting the communication setting change candidate to the communication partner wireless communication device 7. Note that the synchronization here means that the wireless communication device 7 changes to the same communication setting as the changed communication setting in the wireless communication device 1 in response to the wireless communication device 1 changing the communication setting. To match. That is, the wireless communication devices 1 and 7 use the same communication settings using transmission and reception channels that can be wirelessly opposed to each other so as to form a device that performs wireless communication using the FDD point-to-point wireless communication method. The timing for changing the communication setting may be a timing that matches the time, or may be a timing that is slightly different from the time.

  Since the wireless communication device 1 (7) of the first embodiment has the above configuration (function), the following effects can be obtained. That is, the wireless communication device 1 (7) can obtain an effect that it is possible to prevent the signal quality of the wireless communication from continuing to deteriorate due to a change in the radio wave condition. In other words, the wireless communication device 1 according to the first embodiment has communication setting change candidates in order to improve the quality of the signal by wireless communication when the quality of the received signal is worse than a predetermined change determination state. It has a function to determine. When determining the change candidate of the communication setting, the wireless communication device 1 determines not only the noise level situation of the entire reception frequency band but also the noise level situation of the entire transmission frequency band acquired from the wireless communication device 7 of the communication partner. Also consider. Accordingly, the wireless communication device 1 can determine a communication setting change candidate considering not only the reception channel but also the transmission channel in order to improve the signal quality in the wireless communication.

  Furthermore, the wireless communication device 1 has a function of transmitting (notifying) the communication setting change candidate to the wireless communication device 7 of the communication partner. Thereby, the radio | wireless communication apparatuses 1 and 7 can change communication setting to the same communication setting which can carry out radio | wireless opposing. That is, the wireless communication device 1 can synchronize the contents of the communication settings of the wireless communication device 7 with the changed communication settings in the wireless communication device 1. Thus, after the wireless communication device 1 changes the communication setting, the wireless communication device 7 also changes the communication setting at the same time, so that the wireless communication devices 1 and 7 have different communication settings. , 7 can be prevented from being fixed (maintained) in a disconnected (blocked) state.

  As described above, when the quality of a signal due to wireless communication deteriorates, the wireless communication device 1 can change the communication setting together with the wireless communication device 7 of the communication partner in order to improve the signal quality. Thereby, the wireless communication device 1 according to the first embodiment can prevent a situation in which the signal quality of the wireless communication continues to deteriorate due to a change in the radio wave condition and a situation in which the signal blocking state continues.

Second Embodiment
The second embodiment according to the present invention will be described below.

  Similar to the first embodiment, the wireless communication apparatus according to the second embodiment is a wireless communication apparatus that communicates with a communication partner using a point-to-point wireless communication system that employs the FDD method. FIG. 2 is a block diagram showing the configuration of the wireless communication apparatus according to the second embodiment. The wireless communication device 20 according to the second embodiment includes a storage unit 22, a demodulation unit 23, a control unit 24, a modulation unit 25, a survey unit 26, a communication unit 27, and an antenna 28. . In the second embodiment, since the point-to-point wireless communication method is adopted, the wireless communication device 50 that is the communication partner of the wireless communication device 20 has the same configuration. In addition, although the radio | wireless communication apparatuses 20 and 50 are provided with the structure represented by FIG. 2 as a common structure, the structure of other than that may differ. Here, the configuration of the wireless communication device 20 will be mainly described.

  The storage unit 22 has a function of storing various computer programs (programs) and data. For example, a storage medium such as a hard disk device, a RAM (Random Access Memory), a ROM (Read Only Memory), or the storage medium Composed of a combination. In the second embodiment, the storage unit 22 includes a setting information storage unit 31, an acquisition information storage unit 32, and a noise information storage unit 33. The setting information storage unit 31, the acquired information storage unit 32, and the noise information storage unit 33 are storage areas set in the nonvolatile memory.

  The setting information storage unit 31 stores setting information necessary for wireless communication. The setting information includes, for example, information representing a reception frequency band, a transmission frequency band, a reception channel, and a transmission channel. Here, the reception frequency band is a frequency band that is permitted in advance as a frequency band for the radio communication apparatus 20 to receive a signal transmitted from the radio communication apparatus 50 through radio communication, and the frequency as the reception frequency band. Information indicating the range is stored in the setting information storage unit 31. Further, by dividing the reception frequency band into a plurality of channels, a plurality of channels (partition regions) are set in the reception frequency band. Information representing the frequency band (frequency range) of each channel is stored in the setting information storage unit 31. Furthermore, a channel selected as a channel that is actually used for signal reception from among a plurality of channels in the reception frequency band is set as the reception channel. Information indicating the reception channel (for example, information indicating the reception frequency that is the center frequency of the reception channel and its bandwidth) is stored in the setting information storage unit 31.

  The transmission frequency band is a frequency band that is preliminarily permitted as a frequency band in which the wireless communication device 20 transmits a signal to the wireless communication device 50 of the communication partner, and information indicating a frequency range as the transmission frequency band is provided. It is stored in the setting information storage unit 31. Further, by dividing the transmission frequency band into a plurality of channels, a plurality of channels (partition regions) are set in the transmission frequency band. Information representing the frequency range of each channel is stored in the setting information storage unit 31. Furthermore, a channel selected as a channel actually used for signal transmission from among a plurality of channels in the transmission frequency band is set as the transmission channel. Information representing the transmission channel (for example, information representing the transmission frequency and the bandwidth thereof, which is the center frequency of the transmission channel) is stored in the setting information storage unit 31. In the second embodiment, the interval between the reception frequency of the reception channel and the transmission frequency of the transmission channel is determined in advance. The bandwidth of the reception channel is the same as the bandwidth of the transmission channel.

  Further, the setting information storage unit 31 stores information on a plurality of types of modulation schemes.

  Furthermore, the setting information storage unit 31 stores the following communication setting information. The communication setting is information in which setting information that is a basis of wireless communication used when performing wireless communication is combined. In the second embodiment, the communication settings include setting items for radio frequency items including the reception frequency and the transmission frequency, reception channel and transmission channel bandwidth items, and signal modulation method items. . The setting information storage unit 31 stores a plurality of types of communication settings with different combinations of radio frequencies, bandwidths, and modulation schemes, with priority information added. For example, the highest priority is given to the communication setting determined to be the most desirable communication setting. Furthermore, when it is necessary to set communication settings other than the communication setting with the highest priority, it is assumed that there is the following demand for setting the communication settings. This demand is, for example, the radio frequency (reception frequency and transmission frequency) that is set to be used mainly as much as possible, and the amount of data transmitted per unit time (hereinafter simply referred to as data transmission amount). ) Is a request that more is preferable. When there is such a request, for example, a plurality of types of communication settings are set in which the radio frequency is the same and at least the modulation method is different from the bandwidth and the modulation method. Among these communication settings, communication settings that can increase the amount of data transmission are given a high priority, and communication settings that have a small amount of data transmission are given a lower priority. It is assumed that it is difficult to improve signal quality by wireless communication without changing the wireless frequency. In consideration of this, a plurality of types of communication settings may be set that have a radio frequency different from the main radio frequency as described above and have a different combination of bandwidth and modulation scheme. These communication settings are given a priority lower than the priority given to the communication settings having the main radio frequency. Furthermore, considering the cause of signal quality deterioration due to wireless communication, there are multiple types of causes such as environmental changes such as fading and rainfall, and sudden electromagnetic interference due to radar, etc. May be given priorities for each cause.

  Further, the setting information storage unit 31 stores selection information of communication settings selected as communication settings to be actually used from such communication settings. As described above, selection information of communication settings to be actually used is stored in the setting information storage unit 31 which is a nonvolatile memory. Thereby, even if the function of the wireless communication device 20 is stopped due to an unexpected situation, the wireless communication device 20 returns to the original state based on the stored information when restarting. Can do.

  The noise information storage unit 33 stores information related to noise in the received signal. The information regarding the noise of the received signal is information acquired by the functions of the investigation unit 26 and the control unit 24 in the second embodiment.

  The acquisition information storage unit 32 stores information related to noise in the received signal transmitted from the wireless communication device 50 of the communication partner.

  The antenna 28 has a configuration capable of wireless communication (transmission / reception) of signals in the reception frequency band and transmission frequency band set (permitted) in advance. The communication unit 27 includes a circuit configuration that receives a signal received by the antenna 28 and a circuit configuration that outputs a signal transmitted by wireless communication toward the antenna 28. Further, the communication unit 27 includes a band transmission filter (not shown), and extracts a signal in a frequency band set as a reception channel from the signal received by the antenna 28 by the band transmission filter. It has a configuration.

  The investigation unit 26 has a function of capturing a reception signal over the entire reception frequency band via the communication unit 27 and acquiring a noise level of the reception signal in the reception frequency band. In the second embodiment, the investigation unit 26 has a spectrum analyzer function, and thus, by continuously acquiring the noise level of the reception signal in the reception frequency band, the frequency distribution of the noise level in the reception frequency band is obtained. It has functions that can be obtained. Further, the investigation unit 26 has a function of storing information on the acquired noise level in the noise information storage unit 33.

  The demodulator 23 has a circuit configuration that receives the reception signal of the reception channel extracted by the band transmission filter of the communication unit 27, separates the reception signal into a carrier wave and a signal (data), and extracts (demodulates) the signal. . The demodulation method is determined based on the modulation method included in the communication setting (communication setting actually used for wireless communication) represented by the communication setting selection information stored in the setting information storage unit 31. Demodulation method. That is, in the second embodiment, the modulation method of the signal transmitted from the wireless communication device 50 of the communication partner is included in the communication setting represented by the communication setting selection information stored in the setting information storage unit 31. This is the same as the modulation method used. For this reason, a method (demodulation method) for demodulating the received signal received from the wireless communication device 50 of the communication partner is included in the communication setting represented by the communication setting selection information stored in the setting information storage unit 31. It can be determined based on the modulation method that is present.

  In the second embodiment, the demodulator 23 further converts the signal (analog signal) extracted by demodulating the received signal received from the communication unit 27 into a digital signal and outputs the converted signal. I have. The output digital signal is output to another device or circuit via an interface unit (not shown), for example. In the second embodiment, a signal is transmitted from the control unit 24 of the wireless communication device 50 of the communication partner to the control unit 24 of the wireless communication device 20. When a signal whose destination is the control unit 24 is transmitted from the wireless communication device 50, the signal is supplied from the demodulation unit 23 to the control unit 24.

  Further, in the second embodiment, the demodulator 23 has a function of detecting a bit error of the demodulated signal. Furthermore, the demodulator 23 has a function of determining that the quality of the received signal has deteriorated when it is detected that the change determination state in which the occurrence rate of the bit error is equal to or greater than a threshold value, and a signal for informing that is provided. A function of notifying the control unit 24 is provided.

  The modulation unit 25 includes a circuit configuration that modulates a transmission target signal to be transmitted by wireless communication using a modulation method determined by the control unit 24. The transmission target signal supplied to the modulation unit 25 is added to the modulation unit 25 from another device or circuit via an interface unit (not shown), for example. In the second embodiment, a signal to be transmitted is also added from the control unit 24 to the modulation unit 25.

  In the second embodiment, the transmission target signal applied to the modulation unit 25 is a digital signal, and the modulation unit 25 has a function of converting the digital signal into an analog signal and modulating the analog signal. The modulation method is a modulation method included in the communication setting represented by the communication setting selection information stored in the setting information storage unit 31. The modulated signal is output from the modulation unit 25 to the communication unit 27 as a signal for wireless transmission.

  The control unit 24 has a function of controlling the wireless communication by controlling the demodulation unit 23, the modulation unit 25, and the communication unit 27, and becomes a basis of the wireless communication when the quality of the signal by the wireless communication deteriorates. It has a function to change communication settings. In the second embodiment, in order to realize such a function, the control unit 24 includes a monitoring unit 35, a synchronization unit 36, a calculation unit 37, a determination unit 38, and a signal unit 39 as functional units. It has. Note that the control unit 24 includes, for example, a CPU (Central Processing Unit), and the CPU executes the computer program read from the storage unit 22, thereby realizing the functions described above in the control unit 24. As described above, the function of the control unit 24 is realized by a combination of hardware and software. Alternatively, the control unit 24 may be configured only by hardware.

  The calculation unit 37 has a function of calculating the peak value and the average value of the noise level in each channel of the reception frequency band based on the noise level situation of the reception frequency band obtained by the investigation unit 26. Here, the peak value and the average value of the noise level calculated by the calculation unit 37 are calculated using the noise level situation for a preset time. The calculation unit 37 further has a function of storing the calculation result in the noise information storage unit 33 as noise level survey information of the reception frequency band.

  Further, the calculation unit 37 transmits the calculation result (peak value and average value for each channel) as noise level investigation information of the reception frequency band to the wireless communication device 50 via the modulation unit 25, the communication unit 27, and the antenna 28 in order. It has a function to do. In the second embodiment, as described above, the information on the noise level over the entire reception frequency band obtained by the investigation unit 26 is processed by the calculation unit 37 and then as noise level investigation information on the reception frequency band. It is transmitted to the wireless communication device 50 of the communication partner.

  The monitoring unit 35 has a function of receiving noise level investigation information in the reception frequency band transmitted from the wireless communication device 50 of the communication partner as noise level investigation information in the transmission frequency band. Further, the monitoring unit 35 has a function of storing the received information in the acquisition information storage unit 32 as noise level investigation information of the transmission frequency band.

  In the second embodiment, the monitoring unit 35 and the calculation unit 37 use the information acquisition unit (that is, the function of transmitting noise level investigation information in the reception frequency band to the communication partner and the noise level investigation information in the transmission frequency band to the communication partner. And a function unit having a function to receive from. With such a monitoring unit 35 and calculation unit 37, the wireless communication devices 20 and 50 constantly acquire (monitor) a noise level situation in the entire frequency band used for wireless communication between the wireless communication devices 20 and 50.

  In order to improve the signal quality of the radio communication when the determination unit 38 continuously receives a signal notifying that the quality of the reception signal is deteriorated from the demodulation unit 23 for a preset time, A function for determining that the communication setting as described above needs to be changed is provided.

  Furthermore, the determination unit 38 determines a communication setting change candidate based on the noise level survey information of the reception frequency band in the noise information storage unit 33 and the noise level survey information of the transmission frequency band in the acquisition information storage unit 32. It has a function.

  In the second embodiment, as described above, the setting information storage unit 31 stores a plurality of types of communication settings with different combinations of radio frequencies, bandwidths, and modulation schemes, with priority information added. ing. When determining the communication setting change candidate, the determination unit 38 adopts the communication setting change candidate as a communication setting change candidate based on the noise level situation of the reception frequency band and the transmission frequency band in order from the communication setting with the highest priority. Judge whether or not. Then, the determination unit 38 determines the communication setting determined to be adopted as the communication setting change candidate as the communication setting change candidate.

  If priority information for each cause of signal quality deterioration is added to the communication setting, the determination unit 38 determines the cause of signal quality deterioration based on the noise level situation, and responds to this cause. Based on the communication setting priority information, communication setting change candidates are determined in the same manner as described above. That is, FIG. 4A is a diagram showing a noise level deteriorated due to sudden electromagnetic interference such as a radar by a solid line A. In this case, the noise level suddenly deteriorates at some frequencies. On the other hand, FIG. 4B is a diagram showing the noise level deteriorated due to a natural phenomenon such as rainfall by a solid line A. In this case, the noise level is deteriorated as a whole regardless of the frequency. Thus, the noise level pattern varies depending on the cause of the deterioration of the noise level. From this, the wireless communication device 20 is provided with data in which information (cause identification information) for identifying the cause of noise level deterioration and the noise level pattern deteriorated due to the cause are associated. The determination unit 38 determines the cause of the deterioration of the signal quality based on the data and the noise level investigation information. The priority for each cause as described above is associated with the cause identification information, and the determination unit 38 uses the cause identification information according to the determined cause of the deterioration and the priority for each cause according to the cause identification information. As described above, the communication setting change candidate is determined.

  Here, a specific example related to the change of the communication setting will be described. FIGS. 3A to 3C are diagrams schematically showing a relationship among a frequency, a noise level, and a data transmission amount that can be communicated without being adversely affected by noise. 3A to 3C, the horizontal axis represents the frequency. The vertical axis represents the noise level, and represents a situation where the noise level increases (deteriorates) as the numerical value increases. A solid line A represents the frequency distribution of the noise level. Further, the square block B represents the data transmission amount by its area. Further, the state in which the block B and the solid line A overlap each other represents a state in which a wireless communication signal is affected by noise and cannot obtain a predetermined signal quality.

  In this example, the transmission frequency band F1 for transmitting a signal from the wireless communication device 20 to the wireless communication device 50 and the reception frequency band F2 for receiving the signal from the wireless communication device 50 by the wireless communication device 50 each have seven channels. It is divided into. Here, on the toilet, the names of CH1 to CH14 are given to these channels in order from the lowest frequency band.

  The state shown in FIG. 3A is a good state where the noise level is level 0 or less in the entire transmission frequency band F1 and reception frequency band F2. Further, channel CH1 is set as a transmission channel for transmitting a signal from radio communication apparatus 20, and channel CH8 is set as a reception channel for radio communication apparatus 20 to receive a signal. In this case, the channel CH8 is set as the transmission channel for the radio communication device 50 facing the radio, and the channel CH1 is set as the reception channel for receiving signals. Further, the modulation method used when the radio communication apparatuses 20 and 50 transmit signals can transmit the signal (data) amount of three blocks shown in FIG. 3A in the frequency band for one channel. Modulation method is set. For example, as such a modulation method, there is 256QAM (Quadrature Amplitude Modulation). Note that such a modulation scheme is also referred to as a modulation scheme S1 here for ease of explanation.

  It is assumed that the radio wave situation around the wireless communication device 20 changes from such a state, and the noise level situation changes in a worsening direction as indicated by the solid line A shown in FIG. In such a case, if the channels CH1 and CH8 are used and the radio communication of the signal with the modulation scheme S1 is to be continued, the radio communication using the CH1 is affected by noise and a bit error occurs, resulting in a good signal. Quality cannot be maintained. Therefore, the wireless communication device 20 improves the signal quality by changing the communication setting.

  In FIG. 3B, the amount of signal (data) that can be communicated without being adversely affected by noise in each channel is represented by block B. For example, it is assumed that the communication quality is improved by changing the reception channel and the transmission channel without changing the modulation scheme S1. In this case, it is assumed that the transmission channel is changed from channel CH1 to channel CH2 (a channel (signal (data) amount for three blocks can be transmitted satisfactorily by one channel)). By changing the transmission channel, the signal quality when the signal is transmitted from the wireless communication device 20 to the wireless communication device 50 is improved. However, since the interval between the transmission channel and the reception channel (interval between the center frequencies) is predetermined, it is necessary to change the reception channel by changing the transmission channel. For this reason, when the transmission channel is changed from the channel CH1 to the channel CH2, the reception channel needs to be changed from the channel CH8 to the channel CH9. However, when trying to communicate a signal (data) amount of three blocks with the reception channel CH9, there arises a problem that the signal quality is greatly deteriorated due to an adverse effect of noise. For this reason, it is not preferable to change the transmission channel from channel CH1 to channel CH2. Therefore, it is assumed that the transmission channel is changed to channel CH5 instead of channel CH2, and the reception channel is changed from channel CH8 to channel CH12. In this case, good signal quality by wireless communication can be obtained in both the transmission channel and the reception channel after the change.

  Further, instead of the technique of improving the signal quality by wireless communication by changing the frequency of the transmission channel and the reception channel without changing the modulation method, the signal quality can be improved by changing the modulation method, for example. For example, it is conceivable to change to a modulation scheme (also referred to as modulation scheme S2 for convenience) that improves signal quality by wireless communication by changing the bandwidth of the reception channel or transmission channel without reducing the data transmission amount. It is done. In this case, for example, three channels CH1 to CH3 are set as transmission channels and three channels CH8 to CH10 are set as reception channels, as indicated by α in FIG. Even in this case, it is possible to obtain a good signal quality by wireless communication without reducing the data transmission amount in both the transmission channel and the reception channel after the change.

  When the determination unit 38 determines a communication setting change candidate that improves the signal quality as described above, the determination unit 38 has a function of outputting the change candidate and a request for requesting the communication setting change to the synchronization unit 36. These change candidates and requests are transmitted to the wireless communication device 50 via the modulation unit 25, the communication unit 27, and the antenna 28 in order by the function of the synchronization unit 36.

  Further, when receiving a change candidate and a request for changing the communication setting from the wireless communication device 50, the determination unit 38 has a function of verifying the signal quality when the communication setting is changed to the change candidate. I have. For this verification, the determination unit 38 uses the noise level survey information of the reception frequency band in the noise information storage unit 33 and the noise level survey information in the acquisition information storage unit 32. If the decision unit 38 decides to adopt the change candidate because the signal quality does not deteriorate even if the change candidate is adopted by this verification, the synchronizer 36 sends a notification (agreement notice) to that effect. Via the wireless communication device 50.

  Further, when the determination unit 38 detects that an agreement notification is returned from the determination unit 38 of the wireless communication device 50 via the synchronization unit 36, the determination unit 38 changes the communication setting to the content of the determined change candidate. Has a function to reconfirm that the signal quality can be improved. The determination unit 38 has a function of confirming the content of the change candidate as the communication setting change content and outputting the change candidate content to the signal unit 39 when reconfirmation is possible. The determination unit 38 has a function of changing a part of the information stored in the storage unit 22 in accordance with the change of the communication setting.

  Furthermore, the determination unit 38 has a function of determining whether or not an elapsed time after transmitting the agreement notification has exceeded a preset monitoring period when the agreement notification is transmitted. Yes. Further, the determination unit 38 determines that the communication partner has changed the communication setting when detecting that the signal from the communication partner is not received (signal cutoff) before the elapsed time exceeds the monitoring period, A function for changing the communication setting to the contents of the received change candidate is provided.

  The signal unit 39 has a function of changing the setting related to the wireless communication of the signal based on the change contents of the communication setting received from the determination unit 38. That is, the signal unit 39 includes a frequency unit 41, a band unit 42, and a method unit 43.

  The frequency unit 41 transmits the transmission frequency (center frequency) of the transmission channel used when transmitting the signal and the reception frequency (center frequency) of the reception channel used when receiving the signal to the communication unit 27. It has a function. The bandwidth unit 42 has a function of transmitting bandwidth information to the communication unit 27. The reception channel and the transmission channel are changed by the frequency unit 41 and the band unit 42.

  The scheme unit 43 has a function of changing the modulation scheme. Further, the scheme unit 43 has a function of changing a demodulation scheme determined in association with the modulation scheme.

  The synchronization unit 36 has a relay function related to the exchange of information between the determination unit 38 and the determination unit 38 in the wireless communication device 50 of the communication partner. That is, the synchronization unit 36 functions to synchronize the change of the communication setting in the wireless communication between the wireless communication devices 20 and 50. Note that the synchronization here refers to the communication setting after the change in the wireless communication device 20 in accordance with the wireless communication device 20 changing the communication setting, as described in the first embodiment. Change to the same communication settings and match the communication settings. That is, the wireless communication devices 20 and 50 only need to be able to change the communication settings so that the communication settings are the same, and the timing for changing the communication settings may be a timing that matches the time, or a timing that is slightly different from the time. There may be.

  Hereinafter, an operation example of the communication setting change of the wireless communication device 20 in the second embodiment will be described with reference to FIG. FIG. 5 is a flowchart illustrating an example of an operation in which the wireless communication devices 20 and 50 change communication settings.

  The wireless communication devices 20 and 50 constantly monitor the noise level status of the reception frequency band and the transmission frequency band by the investigation unit 26 and the control unit 24 (calculation unit 37 and monitoring unit 35) (step S101). The channels used in the wireless communication between the wireless communication devices 20 and 50 executed by this noise level situation monitoring operation are, for example, channels CH1 and CH8 shown in FIG.

  It is assumed that the quality of the received signal of the wireless communication device 20 has deteriorated due to a change in radio wave conditions around the wireless communication device 20. The demodulating unit 23 of the wireless communication device 20 detects this quality deterioration of the received signal (step S102), and thus the determination unit 38 also detects the quality deterioration of the received signal. Then, the determination unit 38 determines communication setting change candidates (step S103). The determination of the change candidate is performed as described above using the noise level survey information of the reception frequency band and the transmission frequency band, the communication setting information stored in the setting information storage unit 31, and the priority order information thereof. . At this time, when the priority for each cause of the reception signal deterioration is given to the communication setting, the determination unit 38 determines the communication setting change candidate in consideration of the cause of the reception signal deterioration.

  Thereafter, the determination unit 38 outputs the change candidate and the communication setting change request to the synchronization unit 36, and the synchronization unit 36 transmits the change candidate and the communication setting change request to the communication partner wireless communication device 50.

  When receiving the change candidate, the determination unit 38 of the wireless communication device 50 verifies the change candidate (step S104). Accordingly, when the determination unit 38 of the wireless communication device 50 determines that the signal quality does not deteriorate even if the communication setting is changed to the content of the change candidate, it returns an agreement notification to the wireless communication device 20.

  The determination unit 38 of the wireless communication apparatus 20 confirms that the communication partner wireless communication apparatus 50 has agreed to change the communication setting to the content of the change candidate by receiving the agreement notification via the synchronization unit 36. (Step S105). Then, the determination unit 38 confirms (changes) the change candidate as a new communication setting (step S106), and outputs the content of the communication setting to the signal unit 39. Thereby, the signal unit 39 controls the communication unit 27, the demodulation unit 23, and the modulation unit 25 according to the changed communication setting, and the wireless communication state (reception channel, transmission channel, bandwidth, modulation, which is the communication setting). Method) is changed.

  Thus, when the communication setting of the wireless communication device 20 is changed, for example, when the transmission channel used for signal transmission from the wireless communication device 20 to the wireless communication device 50 is changed from the channel CH1 to the channel CH5, the wireless communication device 50 The signal from the wireless communication device 20 cannot be received. When the wireless communication device 50 detects that the signal from the wireless communication device 20 cannot be received (signal interruption) (step S107), the determination unit 38 of the wireless communication device 50 sets the communication setting from the wireless communication device 20. The contents of the received change candidate are changed (step S108). Thereby, the radio | wireless communication apparatus 50 changes into channel CH12 from channel CH8, and transmits a signal. The radio communication device 20 receives the signal and confirms that the signal quality is improved based on the received signal (step S109).

  Thus, the wireless communication devices 20 and 50 can continue the wireless communication while maintaining the signal quality by changing the communication setting. In other words, the wireless communication devices 20 and 50 can avoid a situation in which the wireless communication interruption state continues due to a decrease in signal quality.

  Here, a specific example of changing the communication setting will be described. That is, FIG. 6 is a diagram for explaining a specific example of the communication setting changed due to the deterioration of the noise level as shown in FIGS. 4 (a) and 4 (b). This specific example is a specific example of changing the communication setting when the radio frequency (reception frequency and transmission frequency) is regulated and the radio frequency cannot be changed. The bandwidth is variably adjusted in units of channels. In FIG. 6, as in FIG. 3, the solid line A represents the noise level, and the block B represents the data transmission amount. In addition, the state where the solid line A and the block B overlap each other is assumed to be a state where the signal is adversely affected by noise and the signal quality obtained in advance cannot be obtained.

  First, as shown in FIG. 6A, it is assumed that the radio frequency is the frequency fm, and the bandwidths of the reception channel and the transmission channel are four channels. The data transmission amount is assumed to be 16 blocks. In the case of such communication settings, for example, it is assumed that the noise level situation as shown by the solid line A in FIG. Here, since the radio frequency cannot be changed, it is possible to improve the signal quality by radio communication by changing the communication setting as represented by the block B in FIG. 6B. That is, in the communication setting after the change, the modulation method is such that the radio frequency is not changed, the bandwidth is for two channels, and the data transmission amount in one channel is for four blocks.

  Furthermore, it is assumed that the noise level situation as shown by the solid line A in FIG. Here, since the bandwidth is set for each channel, the state shown in FIG. 6B is a state in which not only the radio frequency but also the bandwidth cannot be changed. For this reason, the signal quality is improved by wireless communication by changing the communication setting as represented by the block B in FIG. That is, in the communication setting after the change, the radio frequency and the bandwidth are not changed, and the data transmission amount in one channel is a modulation scheme corresponding to three blocks.

  Furthermore, it is assumed that the noise level situation as shown by the solid line A in FIG. In this case, the communication setting is further changed as shown in the block B in FIG. 6D to improve the signal quality by wireless communication. That is, in the communication setting after the change, the radio frequency and the bandwidth are not changed, and the data transmission amount in one channel is a modulation method that corresponds to two blocks.

  Further, assume that the state shown in FIG. 6A changes to a noise level state as shown by a solid line A in FIG. 6E due to, for example, rain. In this case, for example, as in the block B in FIG. 6E, the radio frequency and the bandwidth are not changed, and the communication has a modulation scheme in which the data transmission amount in one channel is equivalent to three blocks. The signal quality is improved by changing the setting.

  Furthermore, it is assumed that the noise level situation as shown by the solid line A in FIG. In this case, as in the block B in FIG. 6 (f), the radio frequency and the bandwidth are not changed, and the communication has a modulation method for two blocks in which the data transmission amount in one channel is further reduced. The signal quality is improved by changing the setting.

  Furthermore, it is assumed that the noise level situation as shown by the solid line A in FIG. In this case, unlike the block B in FIG. 6F, the radio frequency and the bandwidth are not changed, and the communication setting has a modulation scheme in which the data transmission amount in one channel is equivalent to one block. By changing, signal quality is improved.

  Further, as shown in FIG. 6 (g), when the noise level is deteriorated due to rain or the like, the noise as shown in the solid line A in FIG. Suppose that the level situation deteriorated. In this case, signal quality is improved by wireless communication by changing the communication setting as represented by block B in FIG. That is, in the communication setting after the change, the radio frequency is not changed, the bandwidth is narrowed to two channels, and the data transmission amount in one channel is one block. .

  The wireless communication devices 20 and 50 according to the second embodiment continue to perform wireless communication according to the noise level situation with the same communication setting content by communicating with each other regarding the communication setting that is the basis of the wireless communication. It is possible to flexibly change the contents of the communication settings as described above.

<Third Embodiment>
The third embodiment according to the present invention will be described below. In the description of the third embodiment, parts having the same names as those in the second embodiment are denoted by the same reference numerals, and redundant description of common parts is omitted.

  In the second embodiment described above, the investigation unit 26 has a spectrum analyzer function, and thereby continuously acquires the noise level of the reception signal in the reception frequency band. On the other hand, in the third embodiment, the investigation unit 26 has a function of examining (sampling) the noise level of the received signal at predetermined frequency intervals in the reception frequency band. Specifically, for example, the investigation unit 26 acquires the noise level S of the reception signal at the center frequency of each of the channels CH8 to CH14 in the reception frequency band F2 as illustrated in FIG. Alternatively, the examining unit 26 may acquire the noise level S of the received signal at the band edge of each of the channels CH8 to CH14 in the received frequency band F2 as illustrated in FIG. Further, the investigation unit 26 receives signals at the center frequency of each of the channels CH8 to CH14 and the band edge (the frequency position of the vertical line (dotted line in the figure)) in the reception frequency band F2 as shown in FIG. The noise level S of the signal may be acquired. In other words, in other words, it can be said that the resolution for investigating the noise level has an accuracy of about one third of the bandwidth of one channel. Specifically, when the bandwidth of one channel is 30 MHz, 10 MHz is set as the resolution for investigating the noise level.

  In this way, the position of the frequency at which the noise level of the received signal is intermittently acquired (sampled) may be set as appropriate. However, as the position of the frequency at which the noise level is sampled increases, the accuracy of investigating the noise level situation can be increased. For this reason, in order to make the communication setting after the change by the determination unit 38 more suitable for the noise level situation, it is preferable that the frequency position (number of sampling of the noise level) at which the noise level is sampled is larger. However, as the number of noise level sampling increases, the processing time for processing the noise level sampling value becomes longer. In other words, the number of samplings of the noise level (the position of the frequency at which the noise level is acquired) is appropriately determined in consideration of the accuracy of the noise level situation investigation, the processing time, and the assumed usage pattern of the wireless communication device, for example Is set.

  The configuration other than the investigation unit 26 in the wireless communication device 20 of the third embodiment is the same as the configuration of the wireless communication device 20 of the second embodiment, and the description thereof is omitted here.

  In the second embodiment, the calculation unit 37 calculates the peak value and the average value of the noise level for a preset time in each channel of the reception signal acquired by the investigation unit 26, and the calculation result is received. It is used as noise level survey information for frequency bands. Also in the third embodiment, the calculation unit 37 may execute the same calculation operation as that of the second embodiment, and the calculation result by the calculation unit 37 may be used as the noise level investigation information of the reception frequency band. Alternatively, the calculation unit 37 may be omitted, and the investigation result by the investigation unit 26 may be used as the noise level investigation information of the reception frequency band as it is.

  In the third embodiment, the investigation unit 26 investigates the noise level of the reception signal in the reception frequency band at predetermined frequency intervals. For this reason, the wireless communication device 20 according to the third embodiment can shorten the time required for investigating the noise level of the received signal as compared with the case of continuously examining the noise level of the received signal. As a result, the wireless communication device 20 according to the third embodiment takes the time until the communication setting is changed in order to improve the quality after the quality of the signal due to the wireless communication is lowered due to the deterioration of the noise level of the received signal. It can be shortened (control response is quick).

<Other embodiments>
In addition, this invention is not limited to the 1st-3rd embodiment, Various embodiments can be taken. For example, in the second embodiment, the demodulation unit 23 detects a decrease in signal quality by using the bit error occurrence rate of the received signal. Instead of this, for example, the demodulator 23 may detect a decrease in signal quality by using an SN (Signal-to-Noise) ratio of the received signal. Alternatively, the demodulation unit 23 may detect a decrease in signal quality by using the bit error occurrence rate and the SN ratio.

  Further, in the specific example of changing the communication setting shown in FIG. 6, the bandwidth of the reception channel and the transmission channel is equivalent to two channels (bandwidth corresponding to two predetermined segment areas (channels)), A bandwidth corresponding to an even number of channels (partition regions), such as four channels. Instead of this, for example, the bandwidth of the reception channel and the transmission channel may be a bandwidth corresponding to an odd number of channels, such as one channel and three channels. FIG. 8 shows a specific example. That is, in FIG. 8A, the radio frequency is the frequency fn, and each bandwidth of the reception channel and the transmission channel is one channel. The data transmission amount is equivalent to three blocks. When wireless communication is performed with such communication settings, it is assumed that the noise level has deteriorated such as the solid line A or the chain line a in FIG. In this case, the signal quality by wireless communication can be improved by changing the communication setting as shown in the block B in FIG. In the communication setting after the change, the radio frequency is the frequency fn and the bandwidth is for three channels. The modulation method is a modulation method in which the data transmission amount is three blocks in such a transmission channel.

  Furthermore, the bandwidth of the reception channel is changed from an odd number of channels as shown in FIG. 9A to an even number of channels as shown in FIG. 9B and vice versa. The width may be changed from an even number of channels to an odd number of channels.

  Furthermore, in addition to the second or third embodiment, the wireless communication devices 20 and 50 may include an external information acquisition unit 45 as represented by a dotted line in FIG. For example, the external information acquisition unit 45 may have a function of receiving a standard radio wave (a radio wave including standard time information as a national standard or an international standard) and acquiring standard time information included in the received radio wave. Good. In this case, for example, the wireless communication devices 20 and 50 exchange not only the communication setting but also the change time information for changing the communication setting, and the change time information and the time information based on the standard time information Based on the above, the time for changing the communication setting may be synchronized.

  Further, the external information acquisition unit 45 may have a function of acquiring information (for example, humidity) indicating the state of the surrounding environment where the wireless communication devices 20 and 50 are installed. In this case, for example, the wireless communication devices 20 and 50 further have a function of predicting the time when it starts raining due to an increasing tendency of humidity or the like. Furthermore, it is assumed that the wireless communication devices 20 and 50 store and store communication setting information that is assumed to be appropriate when it starts to rain. When the raining time is predicted, the wireless communication devices 20 and 50 communicate to synchronize the time information and the communication setting information corresponding to the raining time. Thereby, the radio | wireless communication apparatuses 20 and 50 are good also as a structure which changes a communication setting synchronously at the time which the rain started to anticipate.

  Further, in each of the above embodiments, the reception frequency band and the transmission frequency band are defined, but the present invention can also be applied to cases where these defined frequency bands are wider. In this case, the communication setting can be changed as follows. That is, FIG. 10 is a diagram illustrating a specific example related to a change in communication settings. In the specific example shown in FIG. 10, for example, the radio frequency is the frequency fa, the bandwidths of the reception channel and the transmission channel are two channels, and the data transmission amount is four blocks. It is assumed that the wireless communication device 20 is performing wireless communication with the settings. In this case, it is assumed that the communication setting needs to be changed due to the deterioration of the signal quality of the wireless communication due to the change of the radio wave condition. Here, since restrictions on the usable frequency band are loose, the radio communication state can be recovered by appropriately changing the radio frequency to, for example, the frequency fb or the frequency fc. That is, wireless communication is performed without changing the setting that each bandwidth of the reception channel and the transmission channel is for two channels and the amount of data transmission is for four blocks (for example, without changing the modulation scheme). It is possible to recover the state.

1, 7, 20, 50 Wireless communication device 2,26 Survey unit 3 Information acquisition unit 4,38 Judgment unit 5,36 Synchronization unit

Claims (8)

An investigation unit that investigates the noise level of the received signal over the entire reception frequency band that is predetermined as a frequency band for receiving a signal by wireless communication;
A reception channel having a reception frequency and a bandwidth set in the reception frequency band and a transmission channel having a transmission frequency and a bandwidth set in a transmission frequency band predetermined as a frequency band for transmitting a signal are used. The noise level investigation information of the reception frequency band based on the investigation result of the investigation unit is transmitted to a predetermined communication partner that performs wireless communication, and the reception transmitted from the communication partner is performed. An information acquisition unit for acquiring noise level investigation information of a frequency band as noise level investigation information of the transmission frequency band;
When the quality of the received signal is worse than a predetermined change determination state, the quality of the signal by wireless communication is determined based on the noise level investigation information of the reception frequency band and the noise level investigation information of the transmission frequency band. In order to improve, a determination unit that determines a candidate for change of communication setting that is a basis of wireless communication,
A wireless communication apparatus comprising: a synchronization unit that synchronizes with the communication partner regarding the change of the communication setting by transmitting the communication setting change candidate to the communication partner. The determination unit
When the communication setting change candidate is received from the communication partner, the communication setting is changed to the content of the change candidate based on the noise level investigation information of the reception frequency band and the noise level investigation information of the transmission frequency band. Verifying whether or not it can be changed, and if it is determined that the change may be made, a function of returning an agreement notice to the communication partner;
A function of changing the communication setting to the content of the change candidate after the signal from the communication partner cannot be received after returning the agreement notification;
The system further comprises a function of changing the communication setting to the content of the change candidate when the agreement notification is returned from the communication partner after transmitting the communication setting change candidate to the communication partner. The wireless communication device according to 1.   When the agreement notification is returned from the communication partner, the determination unit re-examines the contents of the change candidate based on the noise level investigation information of the reception frequency band and the noise level investigation information of the transmission frequency band. The wireless communication apparatus according to claim 2, further comprising: a confirmation function, wherein the determination unit changes the communication setting to the content of the change candidate after the reconfirmation.   The wireless communication apparatus according to claim 1, wherein the investigation unit investigates a noise level of the reception signal at predetermined frequency intervals in the reception frequency band. The investigation unit continuously investigates the noise level of the reception signal in the reception frequency band,
For each channel that is a divided region into which the reception frequency band is divided into a plurality of channels, the calculation unit further calculates a peak value and an average value of the noise level,
The said determination part is further equipped with the function which determines the change candidate of the said communication setting by utilizing the calculation result of the said calculation part as noise level investigation information of the said receiving frequency band. The wireless communication device according to any one of the above. The frequency interval between the reception frequency and the transmission frequency is determined in advance, and the reception channel and the transmission channel have the same bandwidth, and the modulation method is used when a signal is transmitted to the communication partner. And the modulation method used when the communication partner transmits a signal is defined to be the same,
The communication settings include items of radio frequency including the reception frequency and the transmission frequency, items of the bandwidth of the reception channel and the transmission channel, and items of the modulation scheme of the signal,
The determination unit determines the communication setting obtained by changing the content of at least one of the radio frequency item, the bandwidth item, and the modulation method item as a change candidate for the communication setting. The wireless communication apparatus according to any one of claims 1 to 5. A plurality of types of communication settings with different combinations of the radio frequency, the bandwidth, and the modulation method are given in advance, and priority information is given to these communication settings,
Whether the determination unit adopts as a candidate for changing the communication setting based on the noise level investigation information of the reception frequency band and the noise level investigation information of the transmission frequency band in order from the communication setting with the highest priority. The wireless communication apparatus according to claim 6, wherein the wireless communication apparatus determines and determines a candidate for changing the communication setting. Investigate the noise level of the received signal over the entire reception frequency band that is predetermined as the frequency band for receiving signals by wireless communication,
A reception channel having a reception frequency and a bandwidth set in the reception frequency band and a transmission channel having a transmission frequency and a bandwidth set in a transmission frequency band predetermined as a frequency band for transmitting a signal are used. And transmitting noise level investigation information of the reception frequency band based on the investigation result to a predetermined communication partner that performs wireless communication, and noise level investigation of the reception frequency band from the communication partner Information is acquired as noise level investigation information of the transmission frequency band,
When the quality of the received signal is worse than a predetermined change determination state, wireless communication is performed based on the noise level investigation information of the reception frequency band and the noise level investigation information of the transmission frequency band by the information acquisition unit. In order to improve the quality of the signal by deciding the candidate for changing the communication setting that is the basis of wireless communication,
A wireless communication method for synchronizing the communication setting with the communication partner by transmitting the communication setting change candidate to the communication partner.

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