JP2017212590A - Wireless device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To change communication conditions, such as frequency channel or communication rate, quickly and appropriately.SOLUTION: A first wireless device 10 and a second wireless device 12 perform redundant communication using A channel and B channel. When communication state of one of these channels is not good, the first wireless device 10 and second wireless device 12 perform control communication by stopping data communication by the other channel of good communication state, and changes one channel of not good communication state to other channel in the same frequency band. Each wireless device performing control communication selects the channel to change based on the priority of each channel determined by priority determination processing. The priority determination processing is processing for obtaining the priority of each channel, based on the communication qualities of each channel in the communication direction from the first wireless device 10 toward second wireless device 12, and in the reverse communication direction.SELECTED DRAWING: Figure 3

Description

  The present invention relates to a wireless device and relates to processing for determining communication conditions.

  Specific low-power radios are widely used in data communication and voice communication. The specific low-power radio can be used without applying for a license by following the rules for transmission power, frequency band used, transmission time, etc., and is widely used in a wide range of industries.

  As a communication system using a specific low-power radio, for example, there is one that performs communication between a computer and a public communication network using a specific low-power radio. Patent Documents 1 and 2 describe an alarm device using a specific low-power radio. These patent documents describe that in an emergency such as the occurrence of a fire, an emergency signal is transmitted and received in a plurality of frequency bands to improve communication reliability.

  Patent Document 3 describes a cognitive radio system. In the system described in this document, the frequency band to be used as the control channel is determined from the low frequency band, and information such as frequency information and required quality of application is exchanged between the transmitting and receiving nodes by using the control channel. Is done. Then, a frequency band used as a data channel is determined, and communication is started. In the system described in Patent Document 3, a connection request is transmitted from one transmission / reception node to the other transmission / reception node for each of a plurality of frequency bands used as a control channel or a data channel. When an acknowledgment is transmitted from the other transmission / reception node to one transmission / reception node, the frequency band is used as a control channel or a data channel.

JP2015-14986A Japanese Patent Laying-Open No. 2015-1914 JP 2010-136291 A

  A plurality of frequency channels are defined in the frequency band used by the specific low-power radio. Some specific low-power radios have a control channel defined separately from a data communication channel for transmitting and receiving data to be transmitted, and the data communication channel is changed using the control channel. . Some control channels use a control channel to change the communication rate of the data communication channel. However, there are cases where the communication status at the frequency channel or communication rate of the change destination is not good. Further, in a system such as that described in Cited Document 3, bidirectional communication for confirming whether or not communication is possible between transmission and reception nodes is performed for a plurality of frequency bands, and then a control channel or data A frequency band used as a channel is determined. Therefore, it may take a long time to determine a frequency band used as a control channel or a data channel.

  An object of the present invention is to quickly and appropriately change communication conditions such as a frequency channel and a communication rate.

  The present invention relates to a wireless unit that transmits and receives packets, a communication processing unit that performs data communication by causing the wireless unit to transmit and receive data communication packets, and communication that measures communication quality for a plurality of types of communication conditions in the communication processing unit. A quality measurement unit, wherein the communication quality measurement unit is configured to perform a test process for acquiring each test packet received by the wireless unit for each of a plurality of different communication conditions, and a plurality of the plurality of the communication conditions acquired for the different communication conditions. And a measurement process for measuring the communication quality based on each reception state of the test packet, wherein the communication processing unit determines a data communication condition based on the communication quality.

  Preferably, the communication processing unit causes the radio unit to transmit and receive data communication packets in a plurality of frequency bands, and performs the same data communication in the plurality of frequency bands, and among the plurality of frequency bands When the status of data communication using one frequency band does not satisfy a predetermined condition, data communication using another frequency band is stopped, and control packets are transmitted to and received from the radio unit in the other frequency band Performing the control communication, changing the data communication condition for the one frequency band, executing the changing process, and restarting the redundant communication after executing the changing process, the changing process Includes a process of changing the data communication condition based on the communication quality.

  The present invention also includes a transmission unit that wirelessly transmits a packet, a setting packet that causes a packet communication device that is a packet transmission destination to set communication conditions, and a setting process that causes the transmission unit to transmit the setting packet; A test execution unit for generating a test packet for causing the packet communication device to measure a reception state, and performing a test transmission process for causing the transmission unit to transmit the test packet under communication conditions determined by the setting packet; And the test execution unit executes the setting process and the test transmission process for each of a plurality of different communication conditions.

  The packet communication device is in a state of receiving a packet under communication conditions determined by the setting packet when the setting packet is received, and data based on a reception status of each of the plurality of test packets received under different communication conditions. Preferably, the wireless device according to the present invention determines a communication condition, and includes a reception unit that wirelessly receives a packet, and a data communication packet to the transmission unit and the reception unit according to the data communication condition determined together with the packet communication device. And a communication processing unit that performs data communication with the packet communication device.

  Preferably, the test execution unit executes the setting process and the test transmission process while the communication processing unit is not performing data communication.

  Preferably, the data communication condition includes a condition regarding a frequency channel or a communication rate.

  According to the present invention, communication conditions can be changed quickly and appropriately.

It is a figure which shows the communication system which concerns on embodiment of this invention. It is a figure which shows the example of data communication. It is a figure which shows the example of a priority determination process. It is a figure which shows the timing in the case of performing a priority determination process with data communication and control communication. It is a figure which shows the example of a communication condition change process. It is a figure which shows the hardware of a radio | wireless apparatus.

(1) Configuration of Communication System FIG. 1 shows a communication system according to an embodiment of the present invention. The communication system includes a first wireless device 10 and a second wireless device 12 that perform packet communication. Each radio apparatus is designed with a use frequency band, transmission / reception power, and the like in accordance with, for example, a specific low power radio standard. Packet communication includes data communication and control communication. In data communication, a data packet including communication target data such as voice data, image data, and text data is transmitted from one wireless device to the other wireless device. In the control communication, a control packet for setting a frequency channel or a communication rate when performing data communication is transmitted and received between the first wireless device 10 and the second wireless device 12.

  Data communication between the first radio apparatus 10 and the second radio apparatus 12 is performed by redundant communication using both the A channel included in the A frequency band and the B channel included in the B frequency band. That is, one wireless device transmits a data packet including the same communication target data using an A channel radio signal and a B channel radio signal. The other wireless device acquires communication target data from the data packet in which the data packet is first received out of the A channel and the B channel, and does not use the data packet received later.

  When each wireless device is designed in accordance with a specific low-power radio standard, for example, the A frequency band and the B frequency band include a specific low-power radio such as a 400 MHz band, a 920 MHz band, a 1.2 GHz band, and a 2.4 GHz band. It is selected from a plurality of frequency bands defined for the machine. As will be described later, when each wireless device uses three or more frequency bands, the plurality of frequency bands are selected from a plurality of frequency bands defined for the specific low-power radio. It is.

(2) Redundant communication FIG. 2 shows an example of data communication by a sequence chart. In this figure, transmission of packets on the A channel is indicated by a solid line, and transmission of packets on the B channel is indicated by a broken line.

  The first radio apparatus 10 transmits a data packet on the A channel (S101) and transmits a data packet on the B channel (S102). In the second radio apparatus 12, since the data packet is received first on the A channel, the second radio apparatus 12 acquires the communication target data from the data packet (S103). When the time ta elapses after the data packet is received on the A channel, the second radio apparatus 12 receives the data packet on the B channel. When the second wireless device 12 recognizes that the communication target data included in the data packet is the same as the communication target data included in the previously received data packet, the data received on the B channel The packet is discarded (S104). Here, discarding the data packet includes not only erasing the data packet but also executing no processing relating to the data packet. In response to receiving the data packet on the A channel, the second radio apparatus 12 transmits an acknowledge packet on the A channel (S105). Further, in response to receiving the data packet on the B channel, the second radio apparatus 12 transmits an acknowledge packet on the B channel (S106). The first radio apparatus 10 receives each acknowledge packet, and recognizes that the data packet transmitted through each of the A channel and the B channel is received by the second radio apparatus 12.

  Further, as shown in steps S107 and S108, when the first radio apparatus 10 transmits a data packet on the A channel (S107) and transmits a data packet on the B channel (S108), It is assumed that the transmitted data packet has not been received by the second radio apparatus 12 due to poor communication status. In this case, the second radio apparatus 12 acquires communication target data from the data packet received through the B channel (S109). In response to receiving the data packet on the B channel, the second radio apparatus 12 transmits an acknowledge packet on the B channel (S110). The first radio apparatus 10 receives the acknowledge packet and recognizes that the data packet transmitted on the B channel has been received by the second radio apparatus 12.

  In steps S111 and S112, the first radio apparatus 10 transmits a data packet on the B channel (S111) and transmits a data packet on the A channel (S112). Since the second wireless device 12 receives the data packet first on the B channel, the second wireless device 12 acquires the communication target data from the data packet (S113). When the time tb elapses after the data packet is received on the B channel, the second radio apparatus 12 receives the data packet on the A channel. When the second wireless device 12 recognizes that the communication target data included in the data packet is the same as the communication target data included in the previously received data packet, the data received on the A channel The packet is discarded (S114). In response to receiving the data packet on the B channel, the second radio apparatus 12 transmits an acknowledge packet on the B channel (S115). The second radio apparatus 12 transmits an acknowledge packet on the A channel in response to receiving the data packet on the A channel (S116). The first radio apparatus 10 receives each acknowledge packet, and recognizes that the data packet transmitted through each of the B channel and the A channel is received by the second radio apparatus 12.

  Here, the process of transmitting the data packet from the first radio apparatus 10 to the second radio apparatus 12 has been described, but the process of transmitting the data packet from the second radio apparatus 12 to the first radio apparatus 10 is performed in the same manner. . Audio data, image data, text data, and the like are transmitted in a plurality of data packets. Therefore, a plurality of data packets are sequentially transmitted from the transmitting wireless device to the receiving transmitting device at predetermined time intervals.

  According to such redundant communication, a data packet including the same communication target data is transmitted from one wireless device in both the A channel and the B channel. The other wireless device acquires communication target data from the previously received data packet. As a result, when the communication status of one channel is not good, the communication target data is transmitted from one wireless device to the other wireless device through the other channel, thereby improving the reliability of data communication.

(3) Overview of Communication Condition Change Process The first radio apparatus 10 and the second radio apparatus 12 execute a communication condition change process when the communication status of one of the A channel and the B channel is not good. That is, the data communication by the other channel with the good communication status is stopped and the control communication is performed instead, and one channel with the poor communication status is changed to another channel within the same frequency band by the control communication. .

  For example, if the communication status by the A channel a1 is not good, the data communication by the B channel b1 is stopped, the control communication by the B channel b1 is performed, and the A channel a1 is changed to another A channel a2 in the A frequency band. . If the communication status on the A channel a2 is not good, the A channel a2 is changed to another A channel a3 in the A frequency band. In this way, the A channel in the A frequency band is changed until the communication status becomes good.

  The channel to be changed is selected based on the priority obtained by the priority determination process described later. That is, the first radio apparatus 10 and the second radio apparatus 12 execute control communication, select a channel having the highest priority from the plurality of channels in the A frequency band except for the channel currently used, Change the A channel to the selected channel. If the communication status on the channel is not good, the channel having the next highest priority is selected, and the A channel is changed to the selected channel. When the communication status becomes good after changing the A channel, the first radio apparatus 10 and the second radio apparatus 12 resume data communication using the B channel b1 and resume redundant communication. If there are channels with the same priority among the channels in the A frequency band, for example, a channel with a smaller channel number is preferentially selected. Alternatively, one may be selected at random from a plurality of channels having the same priority.

  Similarly, when the communication status using the B channel b1 is not good, the first radio device 10 and the second radio device 12 stop the data communication using the A channel a1, perform control communication using the A channel a1, and perform the control communication using the B channel b1. To another B channel b2 in the B frequency band. If the communication status in the B channel b2 is not good, the B channel b2 is changed to another B channel b3 in the B frequency band. In this way, the B channel in the B channel frequency band is changed until the communication status becomes good.

  As in the case of changing the A channel, the channel to be changed is selected based on the priority obtained by the priority determination process described later. That is, the first wireless device 10 and the second wireless device 12 execute control communication, select a channel having the highest priority from the plurality of channels in the B frequency band, excluding the currently used frequency, Change the B channel to the selected channel. If the communication status on the channel is not good, the channel having the next highest priority is selected, and the B channel is changed to the selected channel. When the communication status becomes good after changing the B channel, the first radio apparatus 10 and the second radio apparatus 12 resume data communication using the A channel a1 and resume redundant communication. In the case where channels in the B frequency band have the same priority, for example, a channel with a smaller channel number is preferentially selected. Alternatively, one may be selected at random from a plurality of channels having the same priority.

  Whether or not the communication status in data communication is good is determined based on the frequency at which the acknowledge packet is received, the magnitude of the received signal, and the like. For example, with respect to the determination parameter as a measured value of the communication status, a specified value is added every time communication fails, and the specified value is subtracted every time communication succeeds. As a specific example, the wireless device on the data packet transmission side adds a specified value to the determination parameter when no acknowledge packet is received for the transmission of the data packet. When the acknowledge packet for the data packet is received, the specified value is subtracted from the communication status determination parameter. The determination parameter may be reset to an initial value every time a data packet is transmitted a predetermined number of times. When the determination parameter obtained in this way becomes a predetermined threshold value or more, it is determined that the communication status is not good.

(4) Priority Determination Processing (4-1) Basic Processing The priority determination processing will be described with reference to FIG. In this figure, a time axis extending downward is shown for each of the first radio apparatus 10 and the second radio apparatus 12. On each time axis, a symbol representing a channel is shown in a rectangular frame. The first radio apparatus 10 includes an A channel radio unit 14 (Ach radio unit 14), a B channel radio unit 16 (Bch radio unit 16), and a measurement receiving unit 18. Similarly, the second radio apparatus 12 includes an A channel radio unit 20, a B channel radio unit 22, and a measurement receiving unit 24. The A channel radio unit included in each of the first radio apparatus 10 and the second radio apparatus 12 transmits and receives packets in the A frequency band. The B channel radio unit included in each of the first radio apparatus 10 and the second radio apparatus 12 transmits and receives packets in the B frequency band. The measurement receivers included in each of the first radio apparatus 10 and the second radio apparatus 12 receive packets in both the A frequency band and the B frequency band. A channels α1 to αN are defined for channels in the A frequency band, and B channels β1 to βM are defined for channels in the B frequency band. However, N and M are integers of 2 or more.

  The A channel radio unit and the B channel radio unit in each of the first radio apparatus 10 and the second radio apparatus 12 execute the priority determination process in a time zone during which neither data communication nor control communication is performed.

  In the priority determination process, the measurement receiving unit 24 of the second wireless device 12 receives the test packet transmitted from the A channel wireless unit 14 or the B channel wireless unit 16 of the first wireless device 10, and receives the second wireless device. 12 measures the communication quality based on the reception status of the test packet. The measurement receiving unit 18 of the first wireless device 10 receives the test packet transmitted from the A channel wireless unit 20 or the B channel wireless unit 22 of the second wireless device 12, and the first wireless device 10 Measure communication quality based on packet reception status. The communication quality is assumed to be represented by a numerical value, for example, a received signal level is adopted.

  In steps S201 to S212 of FIG. 3, the measurement receiving unit 24 of the second wireless device 12 receives the test packet transmitted from the B channel wireless unit 16 of the first wireless device 10, and the second wireless device 12 A process for measuring the communication quality of each channel in the B frequency band based on the reception status of the test packet is shown. In steps S213 to S216, the measurement receiving unit 24 of the second radio apparatus 12 receives the test packet transmitted from the A channel radio unit 14 of the first radio apparatus 10, and the second radio apparatus 12 performs the test. A process for measuring the communication quality of each channel in the A frequency band based on the packet reception status is shown.

  First, the channels of the B channel radio unit 16 of the first radio apparatus 10 and the B channel radio unit 22 of the second radio apparatus 12 are set to the B channel β10. In addition, the channel of the measurement receiving unit 24 of the second radio apparatus 12 is set to the A channel αN.

  The B channel radio unit 16 of the first radio apparatus 10 transmits a setting packet through the B channel β10 (S201). This setting packet includes command information for setting the channel of the measurement receiving unit 24 of the second radio apparatus 12 to the B channel β1. The B channel radio unit 22 of the second radio apparatus 12 receives the setting packet. The second radio apparatus 12 sets the channel of the measurement receiving unit 24 to the B channel β1 based on the command information included in the received setting packet (S202). As a result, the channel of the measurement receiver 24 is changed from the A channel αN to the B channel β1.

  The B channel radio unit 16 of the first radio apparatus 10 sets a channel to the B channel β1 specified by the setting packet transmitted in step S201, and transmits a test packet (S203). The measurement receiving unit 24 of the second radio apparatus 12 receives the test packet. The second radio apparatus 12 measures and stores the reception quality based on the received signal when the test packet is received (S204). The first radio apparatus 10 returns the channel of the B channel radio unit 16 from the B channel β1 to β10 after the B channel radio unit 16 transmits the test packet.

  Next, the B channel radio unit 16 of the first radio apparatus 10 transmits a setting packet through the B channel β10 (S205). This setting packet includes command information for setting the channel of the measurement receiving unit 24 of the second radio apparatus 12 to the B channel β2. The B channel radio unit 22 of the second radio apparatus 12 receives the setting packet. The second radio apparatus 12 sets the channel of the measurement receiving unit 24 to the B channel β2 based on the command information included in the received setting packet (S206). As a result, the channel of the measurement receiving unit 24 is changed from the B channel β1 to the B channel β2. By the same processing as steps S203 and S204, the first radio apparatus 10 transmits a test packet to the second radio apparatus 12 (S207), and the second radio apparatus 12 is based on the received signal when the test packet is received. The reception quality is measured and stored (S208). The first radio apparatus 10 returns the channel of the B channel radio unit 16 from the B channel β2 to β10 after the B channel radio unit 16 transmits the test packet. Further, the second wireless device 12 measures and stores the reception quality for the B channel β3 by the same processing as steps S201 to S204 and steps S205 to S208 (S209 to S212).

  The B channel wireless unit 16 of the first wireless device 10, the B channel wireless unit 22 of the second wireless device 12, and the measurement receiving unit 24 set the B channels for test packet transmission in the order of β1, β2,. Such reception quality measurement processing is repeated while changing. Thereby, the second radio apparatus 12 measures the reception quality for each B channel. The order of changing the B channel is not limited to the order of β1, β2,.

  Next, processing for measuring reception quality for the A channel will be described. In the following description, after the second wireless device 12 measures the reception quality for each B channel, the channels of the A channel wireless unit 14 of the first wireless device 10 and the A channel wireless unit 20 of the second wireless device 12 are A It is assumed that channel α5 is set. Further, it is assumed that the channel of the measurement receiving unit 24 of the second radio apparatus 12 is set to the A channel βM.

  The first radio apparatus 10 and the second radio apparatus 12 measure the reception quality for each A channel by the same process as the process for measuring the reception quality for each B channel. The A channel radio unit 14 of the first radio apparatus 10 transmits a setting packet through the A channel α5 (S213). This setting packet includes command information for setting the channel of the measurement receiving unit 24 of the second radio apparatus 12 to the A channel α1. The A channel radio unit 20 of the second radio apparatus 12 receives the setting packet. The second radio apparatus 12 sets the channel of the measurement receiving unit 24 to the A channel α1 based on the command information included in the received setting packet (S214). As a result, the channel of the measurement receiver 24 is changed from the B channel βM to the A channel α1.

  The A channel radio unit 14 of the first radio apparatus 10 sets a channel to the A channel α1 specified by the setting packet transmitted in step S213, and transmits a test packet (S215). The measurement receiving unit 24 of the second radio apparatus 12 receives the test packet. The second radio apparatus 12 measures and stores the reception quality based on the received signal when the test packet is received (S216). The first wireless device 10 returns the channel of the A channel wireless unit 14 from the A channel α1 to α5 after the A channel wireless unit 14 transmits the test packet.

  The A channel wireless unit 14 of the first wireless device 10, the A channel wireless unit 20 of the second wireless device 12, and the measurement receiving unit 24 change the A channel in the order of α1, α2,. Repeat the process. As a result, the second radio apparatus 12 measures the reception quality for each A channel. The order of changing the A channel is not limited to the order of α1, α2,.

  Here, a process in which a test packet is transmitted from the first radio apparatus 10 to the second radio apparatus 12 and the second radio apparatus 12 determines the reception quality for each A channel and each B channel (hereinafter, a 1, 2 direction measurement process) Explained). In addition to the 1 and 2 direction measurement processing, the test packet is transmitted from the second radio apparatus 12 to the first radio apparatus 10 by reversing the transmission side and the reception side of the test packet. Processing for measuring the reception quality for the A channel and each B channel (hereinafter referred to as 2 · 1 direction measurement processing) is performed in the same manner. In this case, if the second wireless device 12 executes the process that is supposed to be executed by the first wireless device 10 in FIG. 3, and the second wireless device 12 executes the process that is supposed to be executed by the second wireless device 12 in FIG. Good.

  When the first wireless device 10 and the second wireless device 12 execute the one-direction measurement process once, the second wireless device 12 goes from the first wireless device 10 to the second wireless device 12 for each channel. -Measure and store communication quality for two communication directions. The second radio apparatus 12 determines and stores the priority of each channel based on the communication quality in the 1.2 communication direction. The priority is set to a larger value as the communication quality is better. When the communication quality is represented by the received signal level, the priority is higher as the received signal level is higher.

  In addition, the first wireless device 10 and the second wireless device 12 execute the 2 · 1 direction measurement process once, so that the first wireless device 10 changes from the second wireless device 12 to the first wireless device 10 for each channel. Measure and store the communication quality in the 2.1 direction of communication. When the first radio apparatus 10 and the second radio apparatus 12 execute the 2.1 direction measurement process, the first radio apparatus 10 moves from the second radio apparatus 12 to the first radio apparatus 10 for each channel 2 · 1. Measure and store the communication quality for the communication direction. The first radio apparatus 10 determines and stores the priority of each channel based on the communication quality in the 2 · 1 communication direction.

  The priority determined in this way by the second wireless device 12 is based on the communication quality for the 1.2 communication direction, and the priority determined by the first wireless device 10 is for the 2.1 communication direction. It is based on communication quality. The first wireless device 10 and the second wireless device 12 may determine the priority based on the communication quality in the 1-2 communication direction and the bidirectional communication in the 2/1 communication direction by the following process.

(4-2) Priority based on communication quality in both directions In the 1/2 direction measurement process, a data packet is transmitted only in the 1/2 communication direction. For this reason, the second wireless device 12 cannot acquire the communication quality in the 2.1 communication direction only by the 1.2 direction measurement process. Similarly, the first wireless device 10 cannot acquire the communication quality for the 1.2 communication direction only by the 2/1 direction measurement process.

  Therefore, the first radio apparatus 10 and the second radio apparatus 12 acquire the communication qualities in the 1 · 2 communication direction and the 2 · 1 communication direction in both directions. Repeatedly executes both the 1 · 2 direction measurement process and the 2 · 1 direction measurement process.

  The first radio apparatus 10 may store the communication quality of each channel measured last in the course of the repeatedly executed 2 · 1 direction measurement process as the communication quality actually used. Further, the first radio apparatus 10 may obtain an average value of communication quality measured for a predetermined number of times retroactively for each channel and store it as the communication quality actually used. When the past number of measurements is less than a predetermined number, for example, an average value of communication quality measured over the number of measurements is obtained for each channel and stored as communication quality actually used.

  Similarly, the second radio apparatus 12 may store the communication quality of each channel measured last in the course of the one-way / two-direction measurement process repeatedly executed as the communication quality actually used. Further, the second radio apparatus 12 may obtain an average value of communication quality measured for a predetermined number of times retrospectively for each channel and store it as communication quality actually used. If the number of communication quality measurements performed in the past is less than a predetermined number of times, for example, an average value of communication quality measured over the number of times of measurement is obtained for each channel and stored as actually used communication quality. .

  The first radio apparatus 10 that executes the measurement process in the first and second directions after acquiring the communication quality in the two and one communication directions includes the communication quality in the two and one communication directions in the test packet and transmits the test packet. To do. That is, the communication quality in the direction opposite to the test packet transmission direction is included in the test packet. This communication quality is stored by the first radio apparatus 10 by the previously executed 2 · 1 direction measurement process. The second radio apparatus 12 receives this test packet, performs quality measurement, and acquires and stores the communication quality in the 2.1 communication direction from the test packet.

  For example, the first radio apparatus 10 transmits a test packet including the communication quality in the 2.1 communication direction for the B channel β1 in step S203 of FIG. The second radio apparatus 12 receives this test packet and performs quality measurement (S204), and acquires and stores the communication quality in the 2 · 1 communication direction for the B channel β1 from this test packet.

  In step S207, the first radio apparatus 10 transmits a test packet including communication quality in the 2 · 1 communication direction for the B channel β2. The second wireless device 12 receives the test packet and measures the quality (S208), and acquires and stores the communication quality in the 2 · 1 communication direction for the B channel β2 from the test packet. The first radio apparatus 10 and the second radio apparatus 12 perform the same processing for the other B channels. Furthermore, the first radio apparatus 10 transmits a test packet including the communication quality in the 2 · 1 communication direction for the A channel α1 in step S215. The second wireless device 12 receives this test packet and performs quality measurement (S216), and acquires and stores the communication quality in the 2.1 communication direction for the A channel α1 from this test packet. The first radio apparatus 10 and the second radio apparatus 12 perform the same processing for the other A channels.

  Similarly, the second wireless device 12 that executes the 2.1 direction measurement process after acquiring the communication quality for the 1.2 communication direction includes the communication quality for the 1.2 communication direction in the test packet and performs the test. Send the packet. This communication quality is stored by the second radio apparatus 12 by the previously executed one- or two-direction measurement process. The first radio apparatus 10 receives this test packet, performs quality measurement, and acquires and stores the communication quality in the 1.2 communication direction from the test packet.

  Through such processing, the first wireless device 10 and the second wireless device 12 can perform the communication in the 1 · 2 communication direction and the 2 · 1 communication direction in both directions of the A channel α1 to αN and the B channel β1 to βM. Stores communication quality.

  The first radio apparatus 10 and the second radio apparatus 12 obtain the priority of each channel as follows based on the bidirectional communication quality. For example, the first wireless device 10 and the second wireless device 12 obtain the priority of each channel based on the communication quality in the inferior direction where the communication quality is not good among the 1.2 communication direction and the 2.1 communication direction. . In this case, the first wireless device 10 and the second wireless device 12 have a higher priority as the communication quality in the recessive direction is better.

  Further, the first wireless device 10 and the second wireless device 12 are connected to each channel based on a bidirectional quality average value that is an average value of the communication quality in the 1.2 communication direction and the communication quality in the 2.1 communication direction. Priority may be obtained. When the communication quality value is larger, the communication quality is better, and the first wireless device 10 and the second wireless device 12 have a higher priority as the bidirectional quality average value is larger.

  The communication quality for the 1.2 communication direction may be different from the communication quality for the 2.1 communication direction. Packets are transmitted and received bidirectionally between the first wireless device 10 and the second wireless device 12. Therefore, if the priority is determined based on the communication quality for one communication direction, a priority that appropriately reflects the communication status cannot be obtained, and an appropriate channel is selected as the change destination channel in the communication condition change process. May not be. As described above, since the priority of each channel is determined based on the communication quality in the communication directions of the 1 · 2 communication direction and the 2 · 1 communication direction, the channel to be changed is appropriately selected. The number of channel changes in communication is reduced. As a result, the communication condition changing process is quickly and appropriately performed.

(4-3) When priority determination processing is executed together with data communication and control communication As described above, the first wireless device 10 and the second wireless device 12 are redundant using both the A frequency band and the B frequency band. Data communication is performed using the communication method. Further, the first radio apparatus 10 and the second radio apparatus 12 perform control communication using one of the A frequency band and the B frequency band. Here, a case where priority determination processing is executed together with data communication and control communication will be described.

  The first wireless device 10 and the second wireless device 12 temporarily stop the priority determination process when it is necessary to perform data communication. FIG. 4 shows an example in which the priority determination process is temporarily stopped in the time zones indicated as the data communication start command (S307) and the data communication / control communication (S308 and S309). The process of steps S301 to S304 in which the second radio apparatus 12 obtains the priority for the B channel β1 is the same as the process of steps S201 to S204 shown in FIG.

  FIG. 4 shows an example in which data communication is started after the B channel radio unit 16 of the first radio apparatus 10 transmits the setting packet in step S305. When a data communication start command indicating that data communication should be started is given to the first wireless device 10, the first wireless device 10 performs data communication by the redundant communication method with the second wireless device 12 (S308 and S309). The data communication start command is given to the first radio apparatus 10 by, for example, a user operation or control information output from an external apparatus.

  The data communication / control communication in steps S308 and S309 shown in FIG. 4 includes a communication condition changing process in which data communication is interrupted, control communication is performed, and data communication is performed again.

  In control communication, the channel is changed based on the priority stored when data communication is started. For example, when changing the A channel, the first radio apparatus 10 and the second radio apparatus 12 select the channel with the highest priority from the plurality of channels in the A frequency band, and select A as the selected channel. Change the channel. If the communication status on the channel is not good, the channel having the next highest priority is selected, and the A channel is changed to the selected channel. When the communication status becomes good after the A channel is changed, the first radio apparatus 10 and the second radio apparatus 12 perform data communication using the A channel after the change and the B channel used for control communication. And redundant communication is resumed.

  Similarly, when changing the B channel, the first radio apparatus 10 and the second radio apparatus 12 select the channel with the highest priority from the plurality of channels in the B frequency band, and select the selected channel. Change the B channel. If the communication status on the channel is not good, the channel having the next highest priority is selected, and the B channel is changed to the selected channel. When the communication status becomes good after the B channel is changed, the first radio apparatus 10 and the second radio apparatus 12 use the B channel after the change and the data by the A channel used for control communication. Start communication and resume redundant communication.

  FIG. 4 shows an example in which the communication status of the A channel α5 is not good in the data communication in steps S308 and S309, and the A channel is changed from α5 to α7 by the control communication using the B channel β10. Yes. After the data communication or control communication in steps S308 and S309 is completed, the channel of the A channel wireless unit of the first wireless device 10 and the second wireless device 12 is set to A channel α7. The channel of the B channel radio unit of the first radio apparatus 10 and the second radio apparatus 12 is set to B channel β10.

  The B channel radio unit 16 of the first radio apparatus 10 sets a channel to the B channel β2 specified by the setting packet transmitted in step S305, and transmits a test packet (S310). The measurement receiving unit 24 of the second radio apparatus 12 receives the test packet. The second radio apparatus 12 measures and stores the reception quality based on the received signal when the test packet is received (S311). The first radio apparatus 10 returns the channel of the B channel radio unit 16 from the B channel β2 to β10 after the B channel radio unit 16 transmits the test packet.

  As described above, when it is necessary to perform data communication or control communication, the first wireless device 10 and the second wireless device 12 interrupt the priority determination process, and after the data communication or control communication is completed, the priority determination is performed. Resume processing. That is, the first radio apparatus 10 and the second radio apparatus 12 execute priority determination processing in a time zone during which neither data communication nor control communication is performed, and obtain communication quality for each A channel and each B channel. The process (1 · 2 direction measurement process and 2 · 1 direction measurement process) is repeated.

  The priority determination process is interrupted by one wireless device transmitting a setting packet, the other wireless device receiving the setting packet, setting a channel according to the setting packet, and one wireless device transmitting a test packet. This step may be performed immediately after any one of the steps of measuring the reception quality of the test packet by the other wireless device. However, before executing data communication, each wireless device sets the channels of the A channel wireless unit and the B channel wireless unit as channels for data communication.

(5) Specific Example of Communication Condition Change Process A specific example of the communication condition change process will be described. FIG. 5 shows a timing chart of the communication condition change process. FIG. 5A-1 shows the A channel used by the first radio apparatus and the second radio apparatus. FIG. 5 (A-2) shows the communication status of the A channel shown in FIG. 5 (A-1). A value “1” on the vertical axis indicates that the communication status is good, and a value “0” indicates that the communication status is not good. FIG. 5A-3 shows whether the communication performed by the A channel shown in FIG. 5A-1 is data communication or control communication.

  Similarly, FIG. 5B-1 shows the B channel used by the first radio apparatus and the second radio apparatus. The processing shown in this figure corresponds to steps S308 and S309 in FIG. FIG. 5 (B-2) shows the communication status of the B channel shown in FIG. 5 (B-1). FIG. 5B-3 shows whether the communication performed by the B channel shown in FIG. 5B-1 is data communication or control communication.

  From time t0 to time t1, the first radio apparatus sequentially transmits data packets to the second radio apparatus by redundant communication using the A channel α1 and the B channel β1. In other words, the first radio apparatus sequentially transmits data packets to the second radio apparatus using the radio signal of the A channel α1 and the radio signal of the B channel β1 to perform data communication. The first wireless device transmits a data packet including the same communication target data in the A channel α1 and the B channel β1.

  From time t0 to time t1, the communication status is good for both the A channel α1 and the B channel β1. As shown in FIG. 5 (A-2), when the communication status on the A channel α1 is not good at time t1, the first radio apparatus performs the processes shown in FIGS. 5 (A-3) and (B-3). As shown in FIG. 4, the data communication on the B channel β1 is stopped and the control communication is started while continuing the data communication on the A channel. The control communication is performed as follows, for example.

  Each of the first wireless device and the second wireless device has already obtained the priority for the A channels α1 to αN by the priority determination process, and has already obtained the priority for the B channels β1 to βM. . The first radio apparatus selects the A channel with the highest priority as the change-destination A channel except for the A channel α1. Here, it is assumed that the A channel having the second highest priority after the A channel α1 is α8. The first radio apparatus transmits a channel change request packet to the second radio apparatus using a radio signal of the B channel β1. The channel change request packet includes information for specifying a frequency band in which a channel is to be changed, information for specifying a channel to be changed, and the like. Here, the channel change request packet includes information for specifying the A frequency band as the frequency band for which the channel is to be changed, and includes information for specifying the A channel α8 as the change destination channel.

  The second radio apparatus that has received the channel change request packet stops data communication on the B channel β1. Then, the channel of the A frequency band is changed from the A channel α1 to the A channel α8, and a channel change approval packet is transmitted to the first radio apparatus by a radio signal of the B channel β1. The first wireless device that has received the channel change approval packet changes the channel of the A frequency band from A channel α1 to A channel α8. As a result, the channel of the A frequency band used by the first radio apparatus and the second radio apparatus is changed from the A channel α1 to the A channel α8 at time t2.

  After this, since the communication situation in the channel of the A frequency band has become good, the first wireless device and the second wireless device transmit and receive predetermined control packets to each other, and perform data communication by the redundant communication method at time t3. Resume.

  From time t3 to time t4, the communication status is good for both the A channel α8 and the B channel β1. As shown in FIG. 5 (B-2), when the communication status on the B channel β1 is not good at time t4, the first radio apparatus becomes the one shown in FIGS. 5 (B-3) and (A-3). As shown in FIG. 4, the data communication on the A channel α8 is stopped and the control communication is started while the data communication on the B channel is continued. The control communication is performed as follows, for example.

  The first radio apparatus selects the B channel with the highest priority as the B channel to be changed except for the B channel β1. Here, it is assumed that the B channel having the highest priority excluding the B channel β1 is β5. The first radio apparatus transmits a channel change request packet to the second radio apparatus using a radio signal of A channel α8. The second wireless device that has received the channel change request packet stops data communication on the A channel α8. Then, the channel of the B frequency band is changed from the B channel β1 to the B channel β5, and a channel change approval packet is transmitted to the first radio apparatus by the radio signal of the A channel α8. The first wireless device that has received the channel change approval packet changes the channel of the B frequency band from the B channel β1 to the B channel β5. As a result, the channel of the B frequency band used by the first radio apparatus and the second radio apparatus is changed from the B channel β1 to the B channel β5 at time t5.

  At this time, since the communication state in the channel of the B frequency band is not good, the first wireless device and the second wireless device change the channel by the same communication processing. When the B channel having the highest priority except for the B channels β1 and β5 is β3, the channel of the B frequency band is changed from the B channel β5 to the B channel β3 at time t6.

  After this, since the communication status on the channel of the B frequency band has become good, the first wireless device and the second wireless device transmit and receive predetermined control packets to each other, and perform data communication by the redundant communication method at time t7. Resume.

  In the communication condition changing process, when the second wireless device is the data packet transmitting side, the second wireless device executes the processing executed by the first wireless device in the above description, and the first wireless device The second wireless device executes the process to be executed. Further, when the communication status of both the A channel and the B channel is not good, the first wireless device and the second wireless device do not execute the communication condition changing process.

In this way, in the communication condition change process, each wireless device that executes control communication selects a channel having the highest priority, except for the channel currently used, from among a plurality of channels. Change channel or B channel. If the communication status on that channel is not good, the channel with the highest priority is selected from the remaining channels, and the A channel and B channel are changed to the selected channel. Each wireless device changes the channel until the communication status becomes good. In this communication condition changing process, the channel with the better communication status is used and the channel with the worse communication status is changed, so that the channel change is performed reliably. This suppresses a decrease in the success rate of packet communication.

(6) Hardware of Radio Device FIG. 6 shows the hardware of the radio device 26 used in the communication system. The wireless device 26 is used as the first wireless device 10 and the second wireless device 12 shown in FIG. The wireless device 26 includes a wireless unit 28, a signal processing unit 32, and a storage unit 34. The wireless unit 28 outputs the received packet to the signal processing unit 32 and transmits the packet output from the signal processing unit 32. The radio unit 28 includes an A channel radio unit 36, a B channel radio unit 38 and a measurement receiving unit 30. Each of the A channel radio unit 36 and the B channel radio unit 38 includes a transmission unit 39 that transmits a radio signal and a reception unit 41 that receives the radio signal. The A channel radio unit 36 and the B channel radio unit 38 transmit and receive packets by transmitting and receiving A channel and B channel radio signals, respectively. In this manner, by providing the radio units individually for each frequency band, the frequency band of the radio signal processed by each radio unit is narrowed, and hardware design or manufacture becomes easy. In addition, when each radio | wireless part can process the radio signal over a some frequency band, a common radio | wireless part may be provided with respect to a some frequency band. The measurement receiving unit 30 transmits and receives packets by receiving radio signals of the A channel and the B channel.

  The signal processing unit 32 includes a communication processing unit 40, a communication quality measurement unit 48, a test execution unit 50, and a priority determination unit 52. The signal processing unit 32 may include a processor that executes arithmetic processing according to a program. In this case, the signal processing unit 32 virtually realizes these constituent elements through arithmetic processing. That is, each component provided in the signal processing unit 32 indicates each function realized by executing arithmetic processing according to a program. Each component may be individually configured by hardware.

  The communication processing unit 40 includes a data communication unit 42, a control unit 44, and a control communication unit 46, and performs wireless communication with other wireless devices (packet communication devices) using a plurality of frequency bands together with the wireless unit 28. Do. In addition to data communication, the communication processing unit 40 performs control communication as necessary to execute communication condition change processing.

  The data communication unit 42 generates a data packet and outputs the data packet to the radio unit 28, and acquires the data packet and the acknowledge packet output from the radio unit 28. The data communication unit 42 performs redundant communication using the A channel and the B channel together with the wireless unit 28.

  In data communication, the control unit 44 monitors the communication status for each of the A channel and the B channel. The monitoring of the communication status is performed, for example, by adding a specified value for each communication failure and subtracting the specified value for each successful communication with respect to a determination parameter as a measured value of the communication status. As a specific example, the communication status is monitored as follows. In response to transmission of the data packet, the control unit 44 adds a specified value to the determination parameter when the acknowledge packet is not received by the radio unit 28 and the acknowledge packet is not acquired by the data communication unit 42. When the acknowledge packet is received by the wireless unit 28 and the acknowledge packet is acquired by the data communication unit 42, the specified value is subtracted from the determination parameter. The determination parameter may be reset to an initial value every time a data packet is transmitted a predetermined number of times. When the measured value obtained in this way becomes a predetermined threshold value or more, it is determined that the communication status is not good.

  The control unit 44 executes a communication condition changing process when the communication state of one of the A channel and the B channel is not good. In the communication condition change process, the control unit 44 controls the data communication unit 42 to stop data communication using a good channel with good communication status, and further controls the control communication unit 46 to execute control communication using a good channel. Let The control communication unit 46 uses the priority stored in the storage unit 34 to execute control communication for changing a channel whose communication status is not good.

  The communication quality measurement unit 48, the test execution unit 50, and the priority determination unit 52 execute priority determination processing together with the wireless unit 28.

  The communication quality measuring unit 48 measures the communication quality for a plurality of types of channels (data communication conditions) used by the communication processing unit 40. In other words, the communication quality measuring unit 48 performs test processing for acquiring each test packet received by the wireless unit 28 for each of a plurality of different channels from the wireless unit 28 and each of the plurality of test packets acquired for different channels. Measurement processing for measuring communication quality based on the received signal level (reception status) is executed. The communication quality measuring unit 48 stores the communication quality measured for each channel in the storage unit 34.

  The test execution unit 50 generates a setting packet for causing other wireless devices (packet communication devices) to set a channel, transmits the setting packet to the wireless unit 28, and measures the communication quality of the other wireless devices. And a test transmission process for transmitting the test packet to the wireless unit 28 through a channel defined by the setting packet.

  The priority determination unit 52 obtains the priority of each channel based on the communication quality stored in the storage unit 34 for each channel, and stores the obtained priority for each channel in the storage unit 34.

(7) Process for changing communication rate as communication condition In the above, in the communication condition change process, one channel whose communication status is not good is changed to another channel in the same frequency band. Instead of such processing, processing for changing the communication rate (the amount of information transmitted per unit time) of one channel whose communication status is not good may be executed. For example, when the communication status of one of the A channel and the B channel is not good, control communication is performed using a channel with a good communication status, and the communication rate in one channel with a poor communication status is reduced. When the first wireless device is the data packet transmission side and the communication status of the A channel is not good, control communication is performed as follows.

  The first radio apparatus 10 illustrated in FIG. 1 transmits a communication rate change request packet to the second radio apparatus 12 using a B channel radio signal. The communication rate change request packet includes information indicating the communication rate after the change. Here, the communication rate change request packet includes information indicating a low communication rate having a value smaller than the normal communication rate as the communication rate after the change. The second wireless device 12 that has received the communication rate change request packet changes the communication rate of the A channel to a low communication rate, and transmits a communication rate change approval packet to the first wireless device 10 by a wireless signal of the B channel. The first wireless device 10 that has received the communication rate change acknowledgment packet changes the communication rate of the A channel to a low communication rate. As a result, the communication rate of the A channel is changed to a low communication rate.

  Each wireless device that executes control communication may execute processing for returning the communication rate to the original normal value after a predetermined time has elapsed after changing the communication rate of the A channel to the low communication rate. As a result, it is possible to cope with a temporary deterioration of the communication state and to avoid a reduction in the amount of communicable information over a long period of time. In this case, the first radio apparatus 10 transmits a communication rate change request packet to the second radio apparatus 12 using a B channel radio signal. This channel change request packet includes information indicating a normal communication rate as the changed communication rate. Receiving the communication rate change request packet, the second wireless device 12 changes the communication rate of the A channel to the normal communication rate, and transmits a communication rate change acknowledgment packet to the first wireless device 10 using the B channel wireless signal. . The first wireless device 10 that has received the communication rate change acknowledgment packet changes the communication rate of the A channel to a normal communication rate. As a result, the communication rate of the A channel is returned to the normal communication rate.

  In the communication condition changing process for changing the communication rate, when the second wireless device 12 is the data packet transmitting side, the second wireless device 12 executes the processing executed by the first wireless device 10 in the above description. The second wireless device 12 executes the process executed by the first wireless device 10. When the communication status of the B channel is not good, each wireless device executes processing in which the A channel and the B channel are interchanged in the above description.

  When changing the communication rate, the control unit 44 shown in FIG. 6 controls the data communication unit 42 to stop data communication using a good channel with a good communication status, and further controls the control communication unit 46. Control communication is performed using a good channel. By this control communication, the communication rate in the poor channel is changed.

(8) Communication using three or more frequency bands In the above description, the process in which the first radio apparatus 10 and the second radio apparatus 12 perform communication using two frequency bands has been described. Each wireless device may perform communication using three or more frequency bands. In this case, the first radio apparatus 10 and the second radio apparatus 12 perform redundant communication using channels included in each of a plurality of frequency bands. When the status of data communication using one frequency band (first frequency band) out of a plurality of frequency bands does not satisfy the predetermined condition, the radio device on the data packet transmission side transmits another frequency band ( Data communication using the second frequency band) is stopped. Then, the communication conditions for data communication using the first frequency band are changed by control communication using the second frequency band. The wireless device on the data packet transmission side repeatedly changes the communication condition until the state of data communication using the first frequency band satisfies a predetermined condition. When the status of data communication using the first frequency band satisfies a predetermined condition, the first radio apparatus 10 and the second radio apparatus 12 resume redundant communication.

  When performing communication using three or more frequency bands, each wireless device may include a wireless unit that transmits and receives packets for each frequency band. As one embodiment, each radio apparatus has a configuration in which a radio unit for each frequency band is added to the A channel radio unit and the B channel radio unit.

(9) Communication condition changing process for changing both channel and communication rate In the above, the process for changing the channel and the process for changing the communication rate in the communication condition changing process have been described. These processes may be combined. That is, a process of appropriately combining a process of changing a channel and a process of changing a communication rate may be executed.

  In this case, in the priority determination process, the first radio apparatus and the second radio apparatus execute the 1 · 2 direction measurement process and the 2 · 1 direction measurement process for each of a plurality of types of communication rates. That is, for the first communication rate R1, the first wireless device and the second wireless device perform the 1 · 2 direction measurement processing and the 2 · 1 direction measurement processing with the communication rate at the time of transmitting the test packet as R1. To do. In addition, the first wireless device and the second wireless device execute the 1 · 2 direction measurement process and the 2 · 1 direction measurement process for the second communication rate R2 with the communication rate at the time of transmitting the test packet as R2. To do. Thereafter, similarly, for the i-th communication rate Ri, the communication rate at the time of transmitting the test packet is set to Ri, and the 1 · 2 direction measurement process and the 2 · 1 direction measurement process are executed.

  As a result, the first wireless device and the second wireless device have a priority of 1 or 2 communication directions and 2 for each of a plurality of types of communication rates with respect to each of the A channels α1 to αN and the B channels β1 to βM.・ Determine the priority of one communication direction.

  The first wireless device and the second wireless device that perform control communication change one channel with poor communication status to another channel in the same frequency band, and also change the communication rate as necessary.

  The channel to be changed and the communication rate are selected based on the priority obtained by the priority determination process. That is, in control communication for the A frequency band using the B channel, a plurality of combinations of a plurality of channels in the A frequency band and a plurality of communication rates (hereinafter, a set of channels and communication rates is referred to as a communication condition). Among them, the one having the highest priority is selected except for the communication conditions currently used. Then, the communication condition of the A frequency band is changed to the selected communication condition. If the communication condition under the changed communication condition is not good, the communication condition with the next highest priority is selected, and the communication condition of the A frequency band is changed to the selected communication condition. When the communication condition becomes good after the communication condition is changed, the first wireless device and the second wireless device resume data communication using the B channel and resume redundant communication.

  Similarly, in the control communication for the B frequency band using the A channel, the communication with the highest priority is selected from the plurality of communication conditions for the B frequency band except for the communication conditions currently used. Then, the communication condition of the B frequency band is changed to the selected communication condition. If the communication status under the changed communication conditions is not good, the communication condition with the next highest priority is selected, and the communication condition for the B frequency band is changed to the selected communication condition. When the communication condition becomes good after the communication condition is changed, the first wireless device and the second wireless device resume data communication using the A channel and resume redundant communication.

10 first wireless device, 12 second wireless device, 14, 20, 36 A channel wireless unit, 16, 22, 38 B channel wireless unit, 18, 24, 30 measurement receiving unit, 26 wireless device, 28 wireless unit, 32 signal processing unit, 34 storage unit, 39 transmission unit, 40 communication processing unit, 41 reception unit, 42 data communication unit, 44 control unit, 46 control communication unit, 48 communication quality measurement unit, 50 test execution unit, 52 priority Decision part.

Claims (6)

A wireless unit that transmits and receives packets;
A communication processing unit that performs data communication by causing the wireless unit to transmit and receive data communication packets; and
A communication quality measuring unit for measuring communication quality for a plurality of types of communication conditions in the communication processing unit,
The communication quality measurement unit
A test process for acquiring each test packet received by the wireless unit for each of a plurality of different communication conditions;
Measuring the communication quality based on the reception status of each of the plurality of test packets acquired for different communication conditions, and
The communication processing unit
A wireless device that determines data communication conditions based on the communication quality. The wireless device according to claim 1, wherein
The communication processing unit
Redundant communication for transmitting and receiving data communication packets to and from the wireless unit in a plurality of frequency bands, and performing the same data communication in the plurality of frequency bands;
When the status of data communication using one frequency band among the plurality of frequency bands does not satisfy a predetermined condition, data communication using another frequency band is stopped, and the wireless communication is performed in the other frequency band. Changing the data communication condition for the one frequency band, by performing control communication by causing the unit to transmit and receive control packets;
After executing the change process, perform a restart process to resume the redundant communication,
The change process is
A wireless device comprising a process of changing the data communication condition based on the communication quality. A transmitter that wirelessly transmits packets;
A setting packet that causes a packet communication device that is a packet transmission destination to set communication conditions, a setting process that causes the transmission unit to transmit the setting packet, and a test packet that causes the packet communication device to measure a reception status And a test execution unit that executes a test transmission process for transmitting the test packet to the transmission unit under communication conditions defined by the setting packet,
The test execution unit
A wireless device that executes the setting process and the test transmission process for each of a plurality of different communication conditions. The packet communication device is in a state of receiving a packet under communication conditions determined by the setting packet when the setting packet is received, and data based on a reception status of each of the plurality of test packets received under different communication conditions. The wireless device according to claim 3, wherein communication conditions are determined.
A receiver for wirelessly receiving packets;
A communication processing unit that causes the transmission unit and the reception unit to transmit and receive data communication packets according to the data communication conditions determined together with the packet communication device, and performs data communication with the packet communication device. A wireless device characterized. The wireless device according to claim 4, wherein
The radio apparatus characterized in that the test execution unit executes the setting process and the test transmission process while the communication processing unit is not performing data communication. The radio apparatus according to any one of claims 1 to 5,
The data communication condition includes a condition regarding a frequency channel or a communication rate.

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