JP2019047524A - Radio communication device and radio communication method - Google Patents

Abstract

To prevent quality of radio communication from continuing reduction caused by a change of a radio wave situation.SOLUTION: A radio communication device 1 for performing radio communication using a point-to-point radio communication system adopting an FDD system comprises an investigation unit 2, an information acquisition unit 3, a determination unit 4, and a synchronization unit 5. The investigation unit 2 investigates noise levels of a reception signal over the whole area of a reception frequency band. The information acquisition unit 3 transmits noise level investigation information on the reception frequency band based on an investigation result of the investigation unit 2 to a communication partner 7. The information acquisition unit 3 acquires noise level investigation information that is transmitted from the communication partner 7 and is based on an investigation result of the investigation unit 2 of the communication partner 7, as noise level investigation information in a transmission frequency band. The determination unit 4, when quality of the reception signal has become worse than that in a change determination state, determines a change candidate for communication setting including a modulation system to improve signal quality. The synchronization unit 5 performs synchronization with the communication partner 7 about changing the communication setting by transmitting the change candidate for the communication setting to the communication partner 7.SELECTED DRAWING: Figure 1

Description

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

  As one of the wireless communication methods, there is a point-to-point wireless communication method adopting FDD (frequency division multiplexing) method. In the point-to-point communication mode, the wireless communication apparatus is set (fixed) as a communication partner to perform wireless communication. Further, by adopting the FDD method for communication between a pair of wireless communication devices communicating in the point-to-point wireless communication mode, the wireless communication devices of the pair can efficiently perform mutual communication. . That is, here, one of the pair of wireless communication devices communicating in a point-to-point wireless communication mode is represented as wireless communication device A, and the other is represented as wireless communication device B. In the FDD method, the frequency of a radio wave for transmitting a signal from the wireless communication device A to the wireless communication device B and the frequency of a radio wave for transmitting a signal from the wireless communication device B to the wireless communication device A are different from each other. Therefore, transmission of a signal from the wireless communication device A to the wireless communication device B and transmission of a signal from the wireless communication device B to the wireless communication device A can be simultaneously performed.

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

  As described above, the use of the radio frequency band used for wireless communication between the wireless communication devices A and B is permitted. Therefore, when installing a new wireless communication device, the installer of the device must set the radio wave condition of the new installation location before installing the wireless communication device based on the application status of the use license of the wireless frequency band. Can guess. 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, the change of the wireless route, and the like.

  Patent Document 1 discloses a technique related to wireless communication using a carrier sense multiple access with collision avoidance (CSMA / CA) scheme. Further, according to Patent Document 2, communication can be performed over a wide bandwidth channel with an increased degree of modulation by communicating with a degree of modulation as high as possible or with a wide bandwidth according to the wireless communication apparatus of the communication partner. Discloses a technique for providing a strong wireless communication device.

JP, 2013-187847, A JP 2005-303765 A

  As described above, in the case of newly installing a wireless communication device, the installer of the device installs the wireless communication device so that the quality of wireless communication becomes good. However, even though the wireless communication device is installed as such, after that, the quality of the wireless communication (noise condition etc.) in the wireless communication device is reduced due to the radio wave interference due to the change of the radio wave condition in the installation place. Problems may occur.

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

In order to achieve the above object, the wireless communication device of the present invention is
An investigation unit which investigates the noise level of the received signal over the entire reception frequency band predetermined as a frequency band for receiving a signal by wireless communication;
Use 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 Transmitting noise level survey information of the reception frequency band based on the survey result of the survey unit toward a predetermined communication partner performing wireless communication, and the reception transmitted from the communication partner An information acquisition unit that acquires noise level survey information of a frequency band as noise level survey 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 survey information of the reception frequency band and the noise level survey information of the transmission frequency band. In order to improve, a determination unit that determines change setting of communication setting to be a basis of wireless communication;
And a synchronization unit configured to synchronize with the communication partner regarding the change of the communication setting by transmitting the change candidate of the communication setting to the communication partner.

Further, according to the wireless communication method of the present invention,
Investigate the noise level of the received signal over the entire reception frequency band predetermined as a frequency band for receiving signals by wireless communication,
Use 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 Transmitting noise level survey information of the reception frequency band based on the survey result toward a predetermined communication partner performing wireless communication, and noise level survey of the reception frequency band from the communication partner Information is acquired as noise level survey 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 noise level survey information of the reception frequency band and noise level survey information of the transmission frequency band by the information acquisition unit. In order to improve the quality of the signal due to
By transmitting the change candidate of the communication setting to the communication partner, synchronization with the communication partner regarding the change of the communication setting is achieved.

  According to the present invention, by changing the communication setting according to the change in the radio wave condition, it is possible to prevent the quality of the wireless communication from being continuously lowered due 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 specific pattern example of the noise level when noise level worsens for every cause of deterioration. It is a flow chart showing an example of change operation of communication setting in a radio communication apparatus of a 2nd embodiment. It is a figure explaining the example which changes communication setting according to the situation 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 still another other embodiment. FIG. 14 is a diagram for explaining still another embodiment.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings.

First Embodiment
FIG. 1 is a block diagram showing a simplified configuration of a wireless communication apparatus according to a first embodiment of the present invention. The wireless communication apparatus 1 according to the first embodiment is an apparatus for performing wireless communication by a point-to-point wireless communication system adopting an FDD (frequency division multiplexing) system. That is, the wireless communication device 7 of the communication partner with which the wireless communication device 1 communicates is set (fixed) in advance. Also, a transmission frequency band used when transmitting a signal from the wireless communication device 1 to the wireless communication device 7 that is the communication partner, and a reception frequency band used when the wireless communication device 1 receives a signal from the wireless communication device 7 The different frequency bands are set in advance. Usually, the reception frequency band is divided into a plurality of areas as channels, and a channel selected from among the divided areas (channels) is used as a reception channel. Similarly, with regard to the transmission frequency band, the transmission frequency band is divided into a plurality of regions as channels, and a channel selected from among the divided regions (channels) is used as a transmission channel. The reception channel is set by the reception frequency (that is, the center frequency of the reception channel) and the bandwidth. The transmission channel is set by the transmission frequency (ie, 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 other party of the communication have the following common configuration. That is, the wireless communication device 1 (the wireless communication device 7) includes the investigation unit 2, the information acquisition unit 3, the determination unit 4, and the 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 area of a predetermined reception frequency band.

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

  The determination unit 4 has a function of determining a change setting of communication setting to be a basis of wireless communication of a signal when the quality of a received signal is worse than a predetermined change determination state. That is, based on the noise level investigation information in the reception frequency band and the noise level investigation information in the transmission frequency band, the determination unit 4 determines change setting candidates for communication setting in order to improve the quality of the signal by wireless communication. Here, the quality of the signal indicates how accurately the signal can transmit information. For example, the quality of the signal is degraded due to the deterioration of the noise level of the signal, the increase of the attenuation of the signal level due to propagation (transmission), and the like. Further, as the communication setting, for example, there are a center frequency (reception frequency, transmission frequency) for setting a reception channel or a transmission channel, its bandwidth, a modulation method of a signal at the time of transmitting a signal, and the like.

  The synchronization unit 5 has a function of synchronizing the wireless communication apparatus 7 of the communication partner with respect to the change of the communication setting by transmitting the change candidate of the communication setting to the wireless communication apparatus 7 of the communication partner. Note that with synchronization here, 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, and the communication setting is changed. It is to unite. In other words, the wireless communication devices 1 and 7 use the same communication settings as the wireless communication devices using wirelessly transmittable and receive channels, which constitute a device that performs wireless communication with the FDD point-to-point wireless communication method. The timing for changing the communication setting may be a timing obtained by combining the times or may be a timing obtained by shifting the times slightly.

  The wireless communication device 1 (7) of the first embodiment can obtain the following effects by having the above-described configuration (functions). That is, the wireless communication device 1 (7) can obtain the effect of being able to prevent the signal quality of the wireless communication from continuously decreasing due to the change in the radio wave condition. That is, in the wireless communication device 1 according to the first embodiment, when the quality of the received signal is worse than the predetermined change determination state, the change candidate for the communication setting is improved in order to improve the quality of the signal by wireless communication. Have the ability to determine When determining the change setting of the communication setting, the wireless communication device 1 not only has the noise level condition of the entire reception frequency band but also the noise level condition of the entire transmission frequency band acquired from the wireless communication device 7 of the communication partner. Consider also. Thus, the wireless communication device 1 can determine communication setting change candidates considering not only the reception channel but also the transmission channel in order to improve the signal quality in wireless communication.

  Furthermore, the wireless communication device 1 has a function of transmitting (notifying) the change candidate of the communication setting to the wireless communication device 7 of the communication partner. Accordingly, the wireless communication devices 1 and 7 can change the communication settings to the same communication settings that can be wirelessly opposed. That is, the wireless communication device 1 can synchronize the contents of the communication setting of the wireless communication device 7 with the changed communication setting in the wireless communication device 1. Thus, the wireless communication device 1 changes communication settings at the same time after changing the communication settings after the wireless communication device 1 changes the communication settings, 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 the signal by wireless communication is deteriorated, the wireless communication device 1 can change the communication setting together with the wireless communication device 7 of the communication counterpart in order to improve the signal quality. As a result, the wireless communication device 1 according to the first embodiment can prevent the situation in which the signal quality of wireless communication continues to deteriorate due to the change in the radio wave condition and the situation in which the signal blocking state is continued.

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

  The wireless communication apparatus according to the second embodiment is a wireless communication apparatus that communicates with the other party in a point-to-point wireless communication system adopting the FDD system, as in the first embodiment. FIG. 2 is a block diagram showing the configuration of the wireless communication apparatus of the second embodiment. The wireless communication apparatus 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 system is adopted, the wireless communication apparatus 50 which is the communication counterpart of the wireless communication apparatus 20 also has the same configuration. Although the wireless communication devices 20 and 50 have the configuration shown in FIG. 2 as a common configuration, the other configurations may be different. Here, the configuration of the wireless communication device 20 will be mainly described here.

  The storage unit 22 has a function of storing various computer programs (programs) and data, and, for example, a storage medium such as a hard disk drive, a random access memory (RAM), a read only memory (ROM) or the like. Composed of a combination. In the second embodiment, the storage unit 22 includes a setting information storage unit 31, an acquired 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 non-volatile 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 previously permitted as a frequency band in which the wireless communication device 20 receives a signal transmitted from the wireless communication device 50 by wireless communication, and the frequency as the reception frequency band Information representing the range is stored in the setting information storage unit 31. Further, by dividing the reception frequency band into a plurality, a plurality of channels (division areas) 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. Further, among the plurality of channels in the reception frequency band, a channel selected as a channel actually used for signal reception is set as a reception channel. Information representing this reception channel (for example, information representing the reception frequency that is the center frequency of the reception channel and the bandwidth thereof) is stored in the setting information storage unit 31.

  The transmission frequency band is a frequency band previously 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 representing the frequency range as this transmission frequency band is It is stored in the setting information storage unit 31. Further, by dividing the transmission frequency band into a plurality, a plurality of channels (segmented areas) are set in the transmission frequency band. Information representing the frequency range of each channel is stored in the setting information storage unit 31. Further, among the plurality of channels in the transmission frequency band, a channel selected as a channel actually used for signal transmission is set as a transmission channel. Information representing this transmission channel (for example, information representing the transmission frequency that is the center frequency of the transmission channel and the bandwidth thereof) 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 predetermined. Also, the bandwidth of the receive channel is the same as the bandwidth of the transmit channel.

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

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

  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 non-volatile memory. Thereby, even if the function of the wireless communication device 20 is stopped due to an unexpected situation, when the wireless communication device 20 is restarted, the wireless communication device 20 returns to the original state based on the stored information. Can.

  The noise information storage unit 33 stores information on noise of the received signal. The information related to 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 acquired information storage unit 32 stores information on the noise of the received signal transmitted from the wireless communication device 50 of the communication partner.

  The antenna 28 has a configuration capable of wirelessly communicating (transmitting and receiving) signals of a reception frequency band and a transmission frequency band which are set (permitted) in advance. The communication unit 27 has a circuit configuration that receives a signal received by the antenna 28 and a circuit configuration that outputs a signal to be transmitted by wireless communication to the antenna 28. Furthermore, the communication unit 27 includes a band pass filter (not shown), and is a circuit that extracts a signal of a frequency band set as a reception channel by the band pass filter from among the signals received by the antenna 28. It has a configuration.

  The investigation unit 26 has a function of acquiring the noise level of the reception signal in the reception frequency band by capturing the reception signal over the entire reception frequency band via the communication unit 27. In the second embodiment, the investigation unit 26 has a spectrum analyzer function, thereby continuously acquiring the noise level of the reception signal in the reception frequency band to obtain the frequency distribution of the noise level in the reception frequency band. It has features 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 demodulation unit 23 has a circuit configuration that receives the reception signal of the reception channel extracted by the band pass 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 (the communication setting actually used for wireless communication) represented by the selection information of the communication setting stored in the setting information storage unit 31. It is a demodulation method. That is, in the second embodiment, the modulation scheme of the signal transmitted from the wireless communication device 50 of the communication partner is included in the communication setting represented by the selection information of the communication setting stored in the setting information storage unit 31. Is the same as the modulation method. Therefore, the 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 selection information of the communication setting stored in the setting information storage unit 31. It can be determined on the basis of the modulation method.

  In the second embodiment, the demodulation unit 23 further converts the signal (analog signal) extracted by demodulating the reception signal received from the communication unit 27 into a digital signal, and outputs the converted signal. Have. The output digital signal is output to another device or circuit via, for example, an interface unit (not shown). Further, in the second embodiment, a signal is transmitted from the control unit 24 of the wireless communication device 50 of the communication partner toward 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.

  Furthermore, in the second embodiment, the demodulation unit 23 has a function of detecting a bit error of the demodulated signal. Furthermore, the demodulation unit 23 has a function of determining that the quality of the received signal is deteriorated when detecting that the bit error occurrence rate is the threshold value or more and the change determination state is the threshold value or more. A function to notify the control unit 24 is provided.

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

  In the second embodiment, the signal to be transmitted applied to the modulator 25 is a digital signal, and the modulator 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 selection information of the communication setting 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 wireless communication by controlling the demodulation unit 23, the modulation unit 25, and the communication unit 27. When the quality of the signal by wireless communication is deteriorated, the control unit 24 becomes a basis of the wireless communication. It has a function to change the communication settings. In the second embodiment, in order to realize such a function, the control unit 24 functions as a monitoring unit 35, a synchronization unit 36, a calculation unit 37, a determination unit 38, and a signal unit 39 as functional units. Is equipped. The control unit 24 includes, for example, a CPU (Central Processing Unit), and the CPU executes a computer program read from the storage unit 22 to realize the above-described function of the control unit 24. Thus, 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 predetermined time. The calculation unit 37 further has a function of storing the calculation result in the noise information storage unit 33 as noise level investigation information of the reception frequency band.

  Furthermore, the calculation unit 37 transmits the calculation result (peak value and average value for each channel) to the wireless communication device 50 via the modulation unit 25, the communication unit 27 and the antenna 28 in order as noise level survey information of the reception frequency band. Have the ability to In the second embodiment, as described above, the information on the noise level across the entire reception frequency band obtained by the investigation unit 26 is processed by the calculation unit 37 and then processed 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, as noise level research information of the transmission frequency band, noise level research information of the reception frequency band transmitted from the radio communication apparatus 50 of the communication partner. Furthermore, the monitoring unit 35 has a function of storing the received information in the acquired information storage unit 32 as noise level survey information of the transmission frequency band.

  In the second embodiment, the information acquisition unit (that is, the function of transmitting the noise level survey information of the reception frequency band to the communication partner by the monitoring unit 35 and the calculator 37), the noise level survey information of the transmission frequency band as the communication partner Function unit having the function of receiving from The wireless communication devices 20 and 50 constantly acquire (monitor) the noise level condition of the entire frequency band used for wireless communication between the wireless communication devices 20 and 50 by the monitoring unit 35 and the calculating unit 37 as described above.

  In order to improve the signal quality of the wireless communication when the determination unit 38 continuously receives from the demodulation unit 23 a signal informing that the quality of the received signal is deteriorated for a preset time, It has a function of determining that it is necessary to change the communication settings as described above.

  Further, the determination unit 38 determines communication setting change candidates based on the noise level investigation information of the reception frequency band in the noise information storage unit 33 and the noise level investigation information of the transmission frequency band in the acquired 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 the radio frequency, the bandwidth, and the modulation method in the state where the priority information is given. ing. When determining a change candidate for communication setting, is the determination unit 38 adopted as a change candidate for communication setting based on the noise level situation of the reception frequency band and the transmission frequency band in order from the communication setting having the highest priority? Decide whether or not. Then, the determination unit 38 determines, as communication setting change candidates, the communication setting determined to be adopted as the communication setting change candidate.

  If priority information for each cause of the deterioration of the signal quality is added to the communication setting, the determination unit 38 determines the cause of the deterioration of the signal quality based on the noise level condition, and according to the cause Based on the priority information of the communication setting, the change candidate of the communication setting is determined in the same manner as described above. That is, FIG. 4A is a diagram representing by the solid line A the noise level that is deteriorated due to the sudden electromagnetic interference such as the radar. In this case, the noise level is suddenly deteriorated at some frequencies. On the other hand, FIG. 4 (b) is a diagram representing by the solid line A the noise level that has deteriorated due to a natural phenomenon such as rainfall. In this case, the noise level is generally degraded regardless of the frequency. Thus, the pattern of the noise level differs 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 the noise level deterioration is associated with the noise level pattern deteriorated due to the cause. The determination unit 38 determines the cause of the deterioration of the signal quality based on the data and the investigation information of the noise level. The priority order 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 deterioration and the priority order for each cause. , As described above, communication setting change candidates are determined.

  Here, a specific example related to the change of the communication setting will be described. FIGS. 3A to 3C schematically show the relationship between the frequency, the noise level, and the amount of data transmission that can be communicated without being adversely affected by the noise. In FIGS. 3A to 3C, the horizontal axis represents frequency. Also, the vertical axis represents the noise level, and represents a situation where the noise level increases (is worse) as the numerical value becomes larger. The solid line A represents the frequency distribution of the noise level. Furthermore, the rectangular block B represents the amount of data transmission by its area. Furthermore, the state in which the block B and the solid line A overlap indicates that the signal of the wireless communication is affected by noise and can not obtain the signal quality obtained in advance.

  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 the wireless communication device 20 to receive a signal from the wireless communication device 50 each have seven channels. It is divided into Here, on the toilet, these channels are assigned the names CH1 to CH14 in order from the low frequency band.

  The state shown in FIG. 3A is a good state in which the noise level is equal to or lower than level 0 in the entire transmission frequency band F1 and the reception frequency band F2. Further, the channel CH1 is set as a transmission channel for transmitting a signal from the wireless communication device 20, and the channel CH8 is set as a reception channel for receiving a signal by the wireless communication device 20. In this case, the channel CH8 is set as the transmission channel for the radio communication apparatus 50 facing the radio, and the channel CH1 is set as the reception channel for receiving the signal. Furthermore, the modulation method when the wireless communication devices 20 and 50 transmit signals can transmit the amount of signals (data) for three blocks shown in FIG. 3A in the frequency band for one channel. The modulation scheme is set. For example, as such a modulation scheme, there is 256 QAM (Quadrature Amplitude Modulation). Here, such a modulation scheme is also described as a modulation scheme S1 to facilitate the description.

  It is assumed that the radio wave condition around the wireless communication device 20 changes from such a state, and the noise level state changes in the direction of getting worse as shown by the solid line A shown in FIG. 3 (b). In such a case, if it is attempted to continue the wireless communication of the signal by using the channels CH1 and CH8 and with the modulation method S1, the wireless communication by CH1 is affected by noise and a bit error occurs, and a good signal is obtained. I can not maintain the quality. Therefore, the wireless communication device 20 improves the signal quality by changing the communication setting.

  In FIG. 3 (b), in each channel, the amount of signal (data) that can be communicated without being adversely affected by noise is represented by block B. For example, it is assumed that 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 (the amount of signal (data) for three blocks is a channel which can be well transmitted by one channel). By changing the transmission channel, the signal quality in the case of transmitting a signal 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 (the interval between the center frequencies) is predetermined, it is necessary to change the reception channel by changing the transmission channel. Therefore, when the transmission channel is changed from channel CH1 to channel CH2, the reception channel also needs to be changed from channel CH8 to channel CH9. However, when three blocks of signals (data) are to be communicated by the receiving channel CH9, there is a problem that the signal quality is significantly deteriorated due to the adverse effect of noise. From this, 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 can be obtained by wireless communication in both the changed transmission channel and reception channel.

  Further, instead of the method of improving the signal quality by wireless communication by changing the frequency of the transmission channel and the reception channel without changing the modulation scheme, it is possible to improve the signal quality by changing the modulation scheme, for example. For example, it is considered to change to a modulation method (also described as modulation method S2 for convenience) that improves the signal quality by wireless communication by changing the bandwidth of the reception channel or transmission channel without reducing the data transmission amount. Be 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 in the α portion in FIG. 3C. Also in this case, good signal quality by wireless communication can be obtained without reducing the amount of data transmission in both the changed transmission channel and reception channel.

  The determination unit 38 has a function of outputting the change candidate of the communication setting and the request for requesting the change of the communication setting to the synchronization unit 36 when the change setting of the communication setting for improving the signal quality is determined as described above. The change candidate and the request are transmitted toward the wireless communication device 50 through the modulation unit 25, the communication unit 27, and the antenna 28 in order by the function of the synchronization unit 36.

  Furthermore, the determination unit 38 has a function of verifying the signal quality when the communication setting is changed to the change candidate when the change candidate and the request for changing the communication setting are received from the wireless communication device 50. Have. For this verification, the determination unit 38 uses the noise level investigation information of the reception frequency band in the noise information storage unit 33 and the noise level investigation information in the acquired information storage unit 32. Then, according to this verification, the judging unit 38 does not deteriorate the signal quality even when adopting the change candidate, and therefore, when judging that the change candidate is adopted, the notification (agreement notification) representing that is sent to the synchronization unit 36. A function to reply to the wireless communication device 50 is provided.

  Furthermore, when it is detected that the notification of agreement has been 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. Then, the determination unit 38 has a function of determining the content of the change candidate as the change content of the communication setting and outputting the content of the change candidate to the signal unit 39 when it is confirmed again. In addition, 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 judging unit 38 has a function of judging whether an elapsed time after transmitting the agreement notification has exceeded a preset monitoring period after transmitting the agreement notification. There is. 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 before the elapsed time exceeds the monitoring period (signal cutoff), It has a function to change the communication setting to the contents of the received change candidate.

  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 the frequency unit 41, the band unit 42, and the scheme 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 band 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 as described above.

  The scheme unit 43 has a function of changing the modulation scheme. Furthermore, the scheme unit 43 has a function of changing the demodulation method determined in relation to the modulation method.

  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 in regard to the change of the communication setting in the wireless communication between the wireless communication devices 20 and 50. Here, synchronization is the same as described in the first embodiment, in which the wireless communication device 50 changes the communication setting after the change in the wireless communication device 20 in response to the wireless communication device 20 changing the communication setting. Change to the same communication settings and match the communication settings. In other words, it is sufficient that the wireless communication devices 20 and 50 can change the communication settings to be the same communication settings, and the timing for changing the communication settings may be the timing when the time is set, or the timing when the time is slightly deviated It may be.

  Hereinafter, an operation example of the communication setting change of the wireless communication device 20 according to the second embodiment will be described with reference to FIG. FIG. 5 is a flowchart showing 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 condition 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). Channels used for wireless communication between the wireless communication devices 20 and 50 executed by this noise level condition monitoring operation are, for example, channels CH1 and CH8 shown in FIG. 3A.

  It is assumed that the quality of the received signal of the wireless communication device 20 is deteriorated due to the change of the radio wave condition around the wireless communication device 20. Demodulation of the quality of the received signal is detected by the demodulator 23 of the wireless communication device 20 (step S102), whereby the determiner 38 also detects deterioration of the quality 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 investigation information of the reception frequency band and the transmission frequency band, the information of the communication setting 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 received signal deterioration is given to the communication setting, the determination unit 38 determines the change setting of the communication setting in consideration of the cause of the received signal deterioration.

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

  When receiving the change candidate, the determination unit 38 of the wireless communication device 50 verifies the change candidate (step S104). Thereby, the determination unit 38 of the wireless communication device 50 returns an agreement notification to the wireless communication device 20 when it determines that there is no deterioration in signal quality even if the communication setting is changed to the contents of the change candidate.

  The determination unit 38 of the wireless communication device 20 confirms that the wireless communication device 50 of the communication partner 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 determines (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 communication setting after the change, and the wireless communication state (the reception channel which is the communication setting, the transmission channel, the bandwidth, the modulation) Scheme is changed.

  Thus, when the communication setting of the wireless communication device 20 is changed, for example, 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 can not be received. When the wireless communication device 50 detects that the signal from the wireless communication device 20 can not be received (signal blocking) (step S107), the determination unit 38 of the wireless communication device 50 performs the communication setting from the wireless communication device 20. The content is changed to the content of the received change candidate (step S108). Thereby, the wireless communication device 50 changes the channel CH8 to the channel CH12 and transmits a signal. The wireless 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 the situation where the blocking state of the wireless communication continues due to the deterioration of the signal quality.

  Here, a specific example of the change of the communication setting will be further described. That is, FIG. 6 is a view 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 the change of the communication setting when the radio frequency (reception frequency and transmission frequency) is regulated and the radio frequency can not be changed. Also, the bandwidth is variably adjusted on a channel basis. In FIG. 6, as in FIG. 3, the solid line A represents the noise level, and the block B represents the amount of data transmission. Further, in the state where the solid line A and the block B overlap, it is assumed that the signal is adversely affected by noise and the signal quality obtained in advance can not 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. Further, it is assumed that the amount of data transmission is 16 blocks. In the case of such communication setting, for example, it is assumed that the noise level situation as shown by the solid line A in FIG. Here, since the radio frequency can not be changed, it is possible to improve the signal quality by the 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 radio frequency is not changed, the bandwidth is two channels, and the data transmission amount in one channel is four blocks.

  Further, it is assumed that the noise level situation as shown by the solid line A in FIG. Here, since the bandwidth is set in channel units, the state shown in FIG. 6B is a state in which not only the radio frequency but also the bandwidth can not be changed. From this, by changing the communication setting as represented by block B in FIG. 6C, the signal quality by wireless communication is improved. That is, in the communication setting after the change, the modulation scheme is such that the radio frequency and the bandwidth are not changed, and the data transmission amount in one channel is equal 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 the wireless communication. That is, in the communication setting after the change, the modulation scheme is such that the radio frequency and the bandwidth are not changed, and the data transmission amount in one channel is equivalent to two blocks.

  Further, it is assumed that, from the state shown in FIG. 6A, for example, the noise level situation as shown by the solid line A in FIG. In this case, as in block B in FIG. 6E, for example, communication with a modulation scheme in which the radio frequency and bandwidth are not changed, and the amount of data transmission in one channel is three blocks. Improve the signal quality by changing to the setting.

  Further, it is assumed that the noise level situation as shown by the solid line A in FIG. In this case, as in block B in FIG. 6 (f), communication with a modulation scheme in which the radio frequency and bandwidth are not changed, and the amount of data transmission in one channel is smaller for two blocks. Improve the signal quality by changing to 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 block B in FIG. 6 (f), in the communication setting with a modulation scheme in which the radio frequency and bandwidth are not changed, and the amount of data transmission in one channel is equivalent to one block. Improve the signal quality by making changes.

  Furthermore, as shown in FIG. 6 (g), when it is deteriorated to a noise level situation due to rainfall etc., the noise is as shown by the solid line A in FIG. 6 (h) due to sudden electromagnetic interference. Suppose that the level situation worsens. In this case, signal quality by wireless communication is improved 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 communicate with each other on the communication setting that is the basis of the wireless communication, and continue the wireless communication according to the noise level situation, which is the same as the content of the communication setting. It can be flexibly changed to the contents of the above communication settings.

Third Embodiment
The third embodiment according to the present invention will be described below. In the description of the third embodiment, the same reference numerals as in the second embodiment denote the same parts as in the second embodiment, and a redundant description of the common parts will be 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 investigating (sampling) the noise level of the reception 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. 7A. Alternatively, the investigation unit 26 may obtain the noise level S of the reception signal at the band edge of each of the channels CH8 to CH14 in the reception frequency band F2 as shown in FIG. 7B. Further, the investigation unit 26 receives the center frequency and the band edge (frequency position of the vertical line (dotted line) in the figure) of each channel CH8 to CH14 in the reception frequency band F2 as shown in FIG. 7C. The noise level S of the signal may be obtained. In this case, in other words, the resolution for examining the noise level can be said to be accurate to 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 examining the noise level.

  Thus, the position of the frequency for intermittently acquiring (sampling) the noise level of the received signal may be set as appropriate. However, as the position of the frequency at which the noise level is sampled increases, the accuracy of the investigation of the noise level situation can be enhanced. From this, in order to make the communication setting after the change by the determination unit 38 better conform to the noise level situation, it is preferable that the position of the frequency at which the noise level is sampled (the number of samplings of the noise level) be larger. However, as the number of noise level samplings increases, the processing time for processing the noise level sampling values increases. That is, the sampling number of the noise level (the position of the frequency at which the noise level is acquired) takes into consideration the noise level condition investigation accuracy, the processing time, and the intended usage of the wireless communication apparatus, for example. It 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 will be omitted here.

  In the second embodiment, the calculation unit 37 calculates the peak value and the average value of the noise level for the 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 in the frequency band. Also in the third embodiment, the calculation unit 37 may execute the same calculation operation as that of the second embodiment, and use the calculation result of the calculation unit 37 as noise level survey information of the reception frequency band. Alternatively, instead of this, 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. Therefore, the wireless communication device 20 according to the third embodiment can shorten the time required to investigate the noise level of the received signal as compared to the case where the noise level of the received signal is continuously investigated. As a result, the wireless communication device 20 according to the third embodiment determines the time required to change the communication setting to improve the quality of the signal by wireless communication due to the deterioration of the noise level condition of the received signal. It can be short (rapidly responsive to control).

<Other Embodiments>
The present invention is not limited to the first to third embodiments, and various embodiments can be adopted. 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 demodulation unit 23 may detect the deterioration of the signal quality by using the signal-to-noise (SN) 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 bandwidths of the reception channel and the transmission channel are two channels (a bandwidth of two division areas (channels) determined in advance), The bandwidth corresponds to an even number of channels (segmented areas), such as four channels. Alternatively, for example, the bandwidths of the reception channel and the transmission channel may be bandwidths corresponding to an odd number of channels, such as one channel and three channels. A specific example is shown in FIG. That is, in FIG. 8A, the radio frequency is the frequency fn, and each bandwidth of the reception channel and the transmission channel is for one channel. Also, the amount of data transmission is equivalent to three blocks. When wireless communication is performed with such a communication setting, it is assumed that the noise level situation as shown by a solid line A or a dashed line a in FIG. 8B is deteriorated. In this case, the signal quality by wireless communication can be improved by changing to the communication setting as represented by block B in FIG. In the changed communication setting, the radio frequency is the frequency fn, and the bandwidth is three channels. Also, the modulation scheme is a modulation scheme in which the amount of data transmission in such a transmission channel is equal to three blocks.

  Furthermore, the bandwidth of the reception channel is divided from the odd number of channels as shown in FIG. 9 (a) to the even number of channels as shown in FIG. 9 (b) 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, for example, a dotted line in FIG. For example, even if the external information acquisition unit 45 receives a standard radio wave (a radio wave including information on a standard time as a national standard or an international standard), the external information acquisition unit 45 has a function to acquire 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 The time to change the communication settings may be synchronized based on

  In addition, the external information acquisition unit 45 may have a function of acquiring information (for example, humidity and the like) representing the state of the surrounding environment in which the wireless communication devices 20 and 50 are installed. In this case, for example, the wireless communication devices 20 and 50 further include a function of predicting the time when the rain starts due to the rising tendency of humidity or the like. Furthermore, in the wireless communication devices 20 and 50, it is assumed that information of communication settings assumed to be appropriate at the time of the start of rain is predetermined and stored. The wireless communication devices 20 and 50 communicate with each other in order to synchronize the information of the time with the information of the communication setting according to the start of the rain, when the time of the start of rain is predicted. Thereby, the wireless communication devices 20 and 50 may be configured to synchronize and change the communication setting at the time when the start of the rain is expected.

  Furthermore, in the above embodiments, the reception frequency band and the transmission frequency band are defined, but the present invention is also applicable to cases where the predetermined frequency bands are wider. In this case, communication settings can be changed as follows. That is, FIG. 10 is a diagram for explaining a specific example related to the change of the communication setting. In the specific example shown in FIG. 10, for example, communication in which 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 by setting. In this case, it is assumed that it is necessary to change the communication setting 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 usable frequency bands are relaxed, recovery of the wireless communication state can be achieved by appropriately changing the wireless frequency to, for example, the frequency fb or the frequency fc. That is, without changing the setting that the bandwidths of the reception channel and the transmission channel are two channels and the data transmission amount is four blocks (for example, without changing the modulation scheme), wireless communication It is possible to recover the condition.

1, 7, 20, 50 wireless communication device 2, 26 investigation unit 3 information acquisition unit 4, 38 determination unit 5, 36 synchronization unit

Claims (8)

An investigation unit which investigates the noise level of the received signal over the entire reception frequency band predetermined as a frequency band for receiving a signal by wireless communication;
Use 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 Transmitting noise level survey information of the reception frequency band based on the survey result of the survey unit toward a predetermined communication party having a function of performing wireless communication and including the survey unit And an information acquisition unit for acquiring, as noise level investigation information of the transmission frequency band, noise level investigation information according to the investigation result of the investigation unit of the communication party transmitted from the communication party.
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 survey information of the reception frequency band and the noise level survey information of the transmission frequency band. In order to improve, a determination unit that determines a change candidate of communication setting including a modulation scheme to be a basis of wireless communication;
A wireless communication apparatus, comprising: a synchronization unit configured to synchronize with the communication partner regarding the change of the communication setting by transmitting the change candidate of the communication setting to the communication partner. The judgment unit
When the communication setting change candidate is received from the communication party, the communication setting is made the content of the change candidate based on the noise level research information of the reception frequency band and the noise level research information of the transmission frequency band. A function of verifying whether or not the change may be made, and returning an agreement notice to the communication party if it is determined that the change may be made;
A function of changing the communication setting to the contents of the change candidate after a signal from the communication party can not be received after returning the agreement notification;
The communication device according to claim 1, further comprising: a function of changing the communication setting to the contents of the change candidate when the agreement notification is returned from the communication party after transmitting the change candidate of the communication setting to the communication party. The wireless communication device according to 1.   The determination unit re-estimates the content of the change candidate based on noise level survey information of the reception frequency band and noise level survey information of the transmission frequency band when the notification of the agreement is returned from the communication party. 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 radio communication apparatus according to any one of claims 1 to 3, wherein the investigation unit investigates the noise level of the received 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,
The signal processing apparatus further includes a calculation unit that calculates a peak value and an average value of noise levels for each channel, which is a divided area obtained by dividing the reception frequency band into a plurality of areas.
4. The apparatus according to claim 1, wherein the determination unit further includes a function of determining a change candidate of the communication setting by using the calculation result of the calculation unit as noise level survey information of the reception frequency band. The wireless communication device according to any one. A 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 a modulation scheme used when transmitting a signal to the communication partner It is defined that the same modulation scheme as that used when the communication partner transmits a signal is
The communication setting includes setting items of an item of radio frequency including the reception frequency and the transmission frequency, an item of the bandwidth of the reception channel and the transmission channel, and an item of the modulation scheme of the signal.
The determination unit determines the communication setting in which the content of at least one of the radio frequency item, the bandwidth item, and the modulation method item is changed as the change setting of the communication setting. The wireless communication apparatus according to any one of claims 1 to 5. A plurality of types of communication settings in which combinations of the radio frequency, the bandwidth, and the modulation scheme are different are given in advance, and priority information is given to the communication settings,
The determination unit determines whether to adopt the communication setting as a change candidate on the basis of 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 having the higher priority. The wireless communication apparatus according to claim 6, wherein the communication setting change candidate is determined to determine the change setting of the communication setting. Investigate the noise level of the received signal over the entire reception frequency band predetermined as a frequency band for receiving signals by wireless communication,
Use 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 And a noise level of the reception frequency band based on the survey result toward a predetermined communication partner having a function of performing wireless communication and having a function of examining the noise level of the reception frequency band Transmitting investigation information, and acquiring, as noise level investigation information of the transmission frequency band, noise level investigation information which is the investigation result of the communication party transmitted from the communication party;
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 survey information of the reception frequency band and the noise level survey information of the transmission frequency band. In order to improve, the candidate for changing the communication setting including the modulation scheme to be the basis of the wireless communication is determined,
A wireless communication method for synchronizing with the communication partner regarding the change of the communication setting by transmitting the change candidate of the communication setting to the communication partner.

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