JP6443755B2 - Receiving apparatus and program - Google Patents

Description

  The present invention relates to a communication technique, and more particularly to a receiving apparatus and a program that use a plurality of frequency channels.

  In the power management system, since the power meter installed in the house transmits the meter reading result to the power company via wireless communication or the like, remote meter reading becomes possible. The power meter executes not only wireless communication with an electric power company but also wireless communication with an electric device installed in a house. Thereby, the electric equipment which can communicate with a power meter can acquire easily the power information measured with the power meter from a power meter, and exact power management is attained (for example, refer patent document 1).

JP 2013-187848 A

  When the number of electronic devices installed in a house increases, signal collisions easily occur due to an increase in traffic. In order to suppress such deterioration of transmission efficiency due to collision, a plurality of frequency channels are used. In order to receive each of the signals of a plurality of frequency channels, the radio apparatus needs to include a radio unit corresponding to each frequency channel, but the circuit scale increases due to the implementation of the plurality of radio units. On the other hand, when only one radio unit is provided, signal reception detection is performed while switching each frequency channel. However, there is a possibility that reception of signals of other frequency channels cannot be detected while such processing is executed for one frequency channel.

  The present invention has been made in view of such circumstances, and an object of the present invention is to provide a technique for suppressing an increase in the probability of communication failure while suppressing an increase in circuit scale when using a plurality of frequency channels. There is.

  In order to solve the above-described problem, a receiving device according to an aspect of the present invention performs one of reception processing in a first frequency channel and reception processing in a second frequency channel different from the first frequency channel. And a transmission device that uses one of the first frequency channel and the second frequency channel as a transmission device to be subjected to reception processing in the reception unit, and registers the other frequency channel And a control unit that causes the reception unit to use one frequency channel and to make the other frequency channel unused when the transmission device to be used is unregistered. When registering a new transmission device that uses the other frequency channel, the control unit causes the reception unit to alternately use one frequency channel and the other frequency channel.

  Another embodiment of the present invention is also a receiving device. The apparatus includes: a receiving unit that performs one of a reception process of a signal including a first preamble and a reception process of a signal including a second preamble different from the first preamble; Is registered as a transmission device to be subjected to reception processing, and transmits a signal including one of the first preamble and the second preamble, and transmits a signal including the other preamble. And a control unit that causes the receiving unit to use one preamble and to make the other preamble unused when the transmitting device to be registered is unregistered. When registering a new transmission device that transmits a signal including the other preamble, the control unit causes the reception unit to alternately use one preamble and the other preamble.

  It should be noted that any combination of the above-described constituent elements and a conversion of the expression of the present invention between a method, an apparatus, a system, a recording medium, a computer program, etc. are also effective as an aspect of the present invention.

  According to the present invention, when a plurality of frequency channels are used, an increase in the probability of communication failure can be suppressed while suppressing an increase in circuit scale.

It is a figure which shows the structure of the communication system which concerns on Example 1 of this invention. FIGS. 2A and 2B are diagrams illustrating frequency channel arrangements of the first communication, the second communication, and the upper communication in FIG. FIGS. 3A and 3B are diagrams showing the format of the packet signal of the first communication, the second communication, and the upper communication in FIG. It is a figure which shows the structure of the radio | wireless apparatus of FIG. FIGS. 5A to 5C are diagrams showing the data structure of the list stored in the storage unit of FIG. 6A to 6D are diagrams illustrating an outline of operations performed by the wireless device in FIG. 6 is a flowchart showing a reception procedure by the wireless device of FIG. 6 is a flowchart showing another reception procedure by the wireless device of FIG. 4. It is a figure which shows the operation | movement outline | summary by the radio | wireless apparatus which concerns on Example 2 of this invention. It is a flowchart which shows the reception procedure by the radio | wireless apparatus which concerns on Example 2 of this invention.

Example 1
Before describing the present invention in detail, an outline will be described. Example 1 of this invention is related with the radio | wireless apparatus which communicates using a some frequency channel. In order to suppress an increase in the circuit scale of the wireless device, the number of wireless units included in the wireless device should be set to “1”. On the other hand, when there is one radio unit, even if the signal of the other frequency channel is received while the reception of the signal of one frequency channel is detected, this is not detected. Therefore, it is desired to suppress an increase in the failure probability of reception detection for a plurality of frequency channels even though there is one radio unit.

  The wireless device registers in advance a communication device that is a target of wireless communication. The communication device also performs wireless communication. However, in order to avoid confusion with the present wireless device, the communication device is referred to herein as a communication device. Wireless communication receives a packet signal from a registered communication device. Here, one or more registered communication devices may use a common frequency channel. That is, there may be a situation where the wireless device only needs to receive a packet signal on one frequency channel. In this case, the radio apparatus performs reception detection of the packet signal while fixing to one frequency channel without performing frequency channel switching.

  FIG. 1 shows a configuration of a communication system 100 according to Embodiment 1 of the present invention. The communication system 100 includes a wireless device 10, a first type terminal device 12, a second type terminal device 14, a smart meter 16, and a collection control station 18. The wireless device 10, the first type terminal device 12, the second type terminal device 14, and the smart meter 16 are installed in a house 28. In FIG. 1, only one house 28 is shown for the sake of clarity, but actually, there are a plurality of houses 28, and each house 28 has a smart meter 16, a wireless device 10, A type 1 terminal device 12 and a type 2 terminal device 14 are installed.

  The collection control station 18, the smart meter 16, the wireless device 10, the first type terminal device 12, and the second type terminal device 14 all have a wireless communication function. The wireless communication between the collection control station 18 and the smart meter 16 is a multi-hop communication 26, and the wireless communication between the smart meter 16 and the wireless device 10 is an upper communication 24. The wireless communication between the wireless device 10 and the first type terminal device 12 is the first communication 20, and the wireless communication between the wireless device 10 and the second type terminal device 14 is the second communication 22. The multi-hop communication 26 is realized by the transfer by the smart meter 16 installed in each house 28, and corresponds to the A route of WiSUN (Wireless Smart Utility Networks). The upper communication 24 corresponds to the B route of WiSUN (Wireless Smart Network Networks), and the first communication 20 corresponds to the HAN (Home Area Network) of WiSUN. The wireless communication system in this field is defined by IEEE802.15.4, but standardized systems (such as WiSUN Alliance) and independently operated systems are mixed.

  The smart meter 16 has a function as a power meter that measures the amount of power used in the house 28 in addition to the wireless communication function described above. The smart meter 16 is connected to a distribution line (not shown) that is supplied with commercial power from an electric power company (electricity provider), and measures the amount of power used in the house 28. Since a known technique may be used for this function, description thereof is omitted here. The smart meter 16 transmits meter reading data including the measurement result of the electric energy to the collection control station 18 through the multi-hop communication 26. The collection control station 18 corresponds to a master unit of the communication system 100 and receives meter reading data from the smart meter 16. This allows remote meter reading by the power company.

  The first type terminal device 12 or the second type terminal device 14 is connected to an electronic device (not shown) installed in the house 28. The electronic device is, for example, an air conditioner, an OA device, or a television receiver. The first type terminal device 12 and the second type terminal device 14 correspond to the first communication 20 and the second communication 22 which are different wireless communication methods, respectively, and communicate with the wireless device 10. Since the wireless device 10 also communicates with the smart meter 16 through the upper communication 24, the wireless device 10 receives the measurement result from the smart meter 16. The measurement result enables accurate power management in the electronic device. In the following, since the operation of the wireless device 10 is focused, the first communication 20, the second communication 22, and the host communication 24 are described.

  2A to 2B show the frequency channel arrangement of the first communication 20, the second communication 22, and the upper communication 24. FIG. FIG. 2A shows the arrangement of frequency channels in the first communication 20 and the upper communication 24. As shown, N frequency channels having a width of 400 kHz are multiplexed. Here, CH1, CH2,..., CHN are shown in order from the lowest frequency. In the present embodiment, the frequency channel used for the first communication 20 and the frequency channel used for the upper communication 24 are different. Hereinafter, it is assumed that the frequency channel used for the first communication 20 is “CHx”, and the frequency channel used for the upper communication 24 is “CHy”.

  FIG. 2B shows the arrangement of frequency channels in the second communication 22. As illustrated, since one frequency channel is 200 kHz wide, the bandwidth is half that of the frequency channel in the first communication 20 and the upper communication 24. Here, the frequency channels arranged in the band of CH1 are denoted as CH1-1 and CH1-2. In the present embodiment, it is assumed that the frequency channel used for the second communication 22 is included in the frequency channel used for the first communication 20. As described above, since the frequency channel used for the first communication 20 is “CHx”, the frequency channel used for the second communication 22 is “CHx−1” or “CHx-2”. is there. In the following, it is assumed that “CHx−1”. For convenience of explanation, “CHx-1” and “CHx-2” may be referred to as the same frequency channel as “CHx” below.

  The wireless device 10 performs communication with the first type terminal device 12, the second type terminal device 14, and the smart meter 16 by CSMA / CA (Carrier Sense Multiple Access / Collision Aidance). More specifically, the wireless device 10 and the smart meter 16 perform communication by CSMA / CA using the frequency channel “CHy”. The wireless device 10 and the first type terminal device 12 perform communication by CSMA / CA using the frequency channel “CHx”, and the wireless device 10 and the second type terminal device 14 use the frequency channel “CHx−1”. Used to execute communication by CSMA / CA. The wireless device 10 is connected to or mounted on a control device that controls an electronic device such as a HEMS (Home Energy Management System) controller, for example.

  3A to 3B show the format of packet signals of the first communication 20, the second communication 22, and the upper communication 24. FIG. FIG. 3A shows the format of packet signals of the first communication 20 and the upper communication 24. In the packet signal, a preamble, UW (Unique Word), and data are arranged in order from the top. The preamble has 15 bytes, and since the transmission rate of the first communication 20 and the upper communication 24 is 100 kbps in common, it has a period of 1.2 msec. The preamble pattern is known. Description of UW and data is omitted.

  FIG. 3B shows the format of the packet signal of the second communication 22. The configuration of the packet signal is the same as that shown in FIG. 3A, and the preamp also has 15 bytes. However, since the transmission rate of the second communication 22 is 40 kbps, which is lower than the transmission rate of the first communication 20 and the upper communication 24, the preamble has a period of 3.0 msec. That is, the preamble period included in the packet signal of the second communication 22 is longer than the preamble period included in the packet signals of the first communication 20 and the higher communication 24.

  FIG. 4 shows the configuration of the wireless device 10. The wireless device 10 includes a communication unit 40, a data processing unit 44, a control unit 46, a storage unit 52, and a reception unit 54. The communication unit 40 includes a reception unit 48 and a transmission unit 50, and the data processing unit 44 includes a registration unit 56. The communication unit 40 corresponds to the above-described wireless unit.

  The receiving unit 48 receives a packet signal in wireless communication by executing processing corresponding to each of the first communication 20, the second communication 22, and the host communication 24. In addition, the reception unit 48 receives the packet signal and also from the control unit 46 during a period when the transmission unit 50 described later does not transmit the packet signal (hereinafter referred to as “search period”). In response to the instruction, the reception of the packet signal is attempted while setting the frequency channel. In other words, the reception unit 48 executes while switching one of the reception process on the frequency channel “CHx” and the reception process on the frequency channel “CHy”.

  As described above, the receiving unit 48 waits while switching between the three types of communication in the two frequency channels in accordance with the instruction from the control unit 46. Under such circumstances, the failure of reception detection may cause retransmission and decrease in efficiency. Note that both the frequency channel “CHx” and the frequency channel “CHy” are not always used at the same time. In particular, in the host communication 24 in the frequency channel “CHy”, transmission from the smart meter 16 is mainly performed at predetermined time intervals (once every 30 minutes). The receiving unit 48 has an amplification function, a frequency conversion function, and a demodulation function, and generates a baseband signal using these functions. The receiving unit 48 outputs the baseband signal to the data processing unit 44.

  The storage unit 52 stores a list of communication devices that are communication targets of the wireless device 10. The communication devices stored in the list are registered by the registration process by the registration unit 56. The registration process will be described later. FIGS. 5A to 5C show the data structure of the list stored in the storage unit 52. FIG. FIG. 5A is an example of a list. Here, one smart meter 16, a plurality of first type terminal devices 12, and a plurality of second type terminal devices 14 are registered. Each of the plurality of first type terminal devices 12 is shown as a first type 1 type terminal device 12a and a second type 1 terminal device 12b, and each of the plurality of type 2 terminal devices 14 is It is shown as 1-type 2 terminal device 14a and 2nd-type 2 terminal device 14b. The description of FIGS. 5B to 5C will be described later, and the description returns to FIG.

  When registered as shown in FIG. 5A, the control unit 46 instructs the reception unit 48 to switch between the two frequency channels at a constant interval as described above. Here, the period for setting the frequency channel “CHx” and the period for setting the frequency channel “CHy” may have different lengths. The operation of the receiving unit 48 at that time is as described above. Such an operation is also called “frequency switching reception mode”.

  FIG. 5B is another example of the list. Here, a plurality of first type terminal devices 12 and a plurality of second type terminal devices 14 are registered, but the smart meter 16 is not registered. That is, a communication apparatus using the frequency channel “CHx” is registered, but a communication apparatus using the frequency channel “CHy” is not registered. FIG. 5C shows another example of the list. Here, the smart meter 16 is registered, but the first type terminal device 12 and the second type terminal device 14 are not registered. That is, the communication device using the frequency channel “CHy” is registered, but the communication device using the frequency channel “CHx” is not registered, and the situation is the reverse of FIG. In summary, a communication device that uses one of the two frequency channels is registered, and a communication device that uses the other frequency channel is not registered. Returning to FIG.

  The control unit 46 confirms the list stored in the storage unit 52. If the list is shown as shown in FIGS. 5B to 5C, the control unit 46 uses one frequency channel for the reception unit 48. And the other frequency channel is unused. Specifically, the control unit 46 instructs the use of only the frequency channel “CHx” in the case of FIG. 5B, and uses only the frequency channel “CHy” in the case of FIG. Instruct. The former is also called “frequency channel CHx reception mode”, and the latter is also called “frequency channel CHy reception mode”. Returning to FIG. The receiving unit 48 sets a frequency channel in accordance with an instruction from the control unit 46 and executes reception processing. When the frequency channel “CHx” is used, there is a possibility that signals of the first communication 20 and the second communication 22 are received. For this reason, the receiving unit 48 sets the preamble of the first communication 20 and the preamble of the second communication 22 while switching between the preambles of the first communication 20 and the frequency channel “CHx”. That is, the receiving unit 48 waits while switching between the signal of the first communication 20 and the signal of the second communication 22.

  The reception unit 54 is configured to include a registration button and the like. When a new communication device is registered in the wireless device 10, the reception unit 54 receives an instruction to register a new communication device when the user depresses the registration button. Not only the “registration button”, but also a registration instruction may be received from, for example, an operation terminal capable of communicating with the wireless device 10. The operation terminal is, for example, a tablet device, a smartphone device, or a dedicated terminal device. When accepting the instruction, the accepting unit 54 notifies the control unit 46 to that effect. When the control unit 46 receives a notification from the reception unit 54, that is, when registering a new communication device that uses the other frequency channel, the control unit 46 makes one frequency channel and the other over a certain period with respect to the reception unit 48. Alternate frequency channels. This corresponds to interrupting the “frequency switching reception mode” in the “frequency channel CHx reception mode” or the “frequency channel CHy reception mode”. The receiving unit 48 repeatedly switches between the frequency channel “CHx” and the frequency channel “CHy” over a certain period in accordance with an instruction from the control unit 46.

  FIGS. 6A to 6D show an outline of operations performed by the wireless device 10. FIG. 6A shows a case where the “frequency channel CHx reception mode” is set. As illustrated, the receiving unit 48 sets the frequency channel “CHx” in the section of the frequency channel CHx reception mode. When the registration acceptance 200 is present, the receiving unit 48 enters the frequency switching reception mode. FIG. 6B shows frequency channels set in the receiver 48 in the section of the frequency switching reception mode. As illustrated, the receiving unit 48 alternately sets the frequency channel “CHy” and the frequency channel “CHx” in the section of the frequency switching reception mode.

  FIG. 6C shows a case where the “frequency channel CHy reception mode” is set. As illustrated, the receiving unit 48 sets the frequency channel “CHy” in the section of the frequency channel CHy reception mode. When the registration acceptance 200 is present, the receiving unit 48 enters the frequency switching reception mode. FIG. 6D shows a frequency channel set in the receiving unit 48 in the section of the frequency switching reception mode. As illustrated, the receiving unit 48 alternately sets the frequency channel “CHx” and the frequency channel “CHy” in the section of the frequency switching reception mode. Returning to FIG.

  The registration unit 56 executes a new communication device registration process when the reception unit 54 receives a registration instruction and the reception unit 48 is in the frequency switching reception mode. A known technique may be used for the registration process. For example, when any one of the frequency channels is set in the section of the frequency switching reception mode, the registration unit 56 receives a registration request from a new communication device via the reception unit 48. The registration unit 56 registers a new communication device by storing information on the new communication device included in the registration request in the storage unit 52. When the registration is completed, the registration unit 56 transmits a registration completion notification to a new communication device via the transmission unit 50. Here, the frequency channel when transmitting the registration completion notification is set to be the same as the frequency channel when the registration request is received. When the registration is completed, the registration unit 56 notifies the control unit 46 of the completion of registration. When deleting a registration, the same processing as that for registering may be performed, and the receiving unit 54 may simply receive an instruction for deletion.

  After the registration is completed, the control unit 46 confirms the list stored in the storage unit 52. When the list is configured as shown in FIG. 5A, the control unit 46 continues to execute the “frequency switching reception mode”. On the other hand, when the list is configured as shown in FIGS. 5B to 5C, the control unit 46 returns to the “frequency channel CHx reception mode” or the “frequency channel CHy reception mode”.

  When the reception unit 48 receives the packet signal during the search period, the control unit 46 fixes the frequency channel for the reception unit 48 and causes the data processing unit 44 to execute reception processing of the packet signal from the reception unit 48. . The packet signal reception process includes a decoding process and the like.

  The data processing unit 44 generates a packet signal when data to be transmitted occurs. The data includes the registration completion notification described above. Here, if the transmission destination of the packet signal is the first type terminal device 12 and the smart meter 16, the data processing unit 44 uses the format of FIG. 3A, and the transmission destination of the packet signal is the second type terminal. If it is the apparatus 14, the format of FIG.3 (b) is used. If the reception unit 48 has not received a packet signal, the control unit 46 causes the transmission unit 50 to output the packet signal generated by the data processing unit 44. If the transmission destination of the packet signal is the first type terminal device 12 and the second type terminal device 14, the control unit 46 sets the frequency channel “CHx” in the transmission unit 50, and the transmission destination of the packet signal is the smart meter 16. If so, the transmission unit 50 is set to the frequency channel “CHy”. The transmission part 50 performs a carrier sense in the set frequency channel, and transmits a packet signal when the transmission timing is acquired.

  This configuration can be realized in terms of hardware by a CPU, memory, or other LSI of any computer, and in terms of software, it can be realized by a program loaded in the memory, but here it is realized by their cooperation. Draw functional blocks. Accordingly, those skilled in the art will understand that these functional blocks can be realized in various forms only by hardware, or by a combination of hardware and software.

  The operation of the communication system 100 configured as above will be described. FIG. 7 is a flowchart showing a reception procedure by the wireless device 10. The control unit 46 and the reception unit 48 execute processing in the frequency channel CHx reception mode (S10). If the registration button is not depressed (N in S12), the process waits. If the registration button is pressed (Y in S12), the control unit 46 and the reception unit 48 execute processing in the frequency switching reception mode (S14). The registration unit 56 registers the smart meter 16 (S16).

  FIG. 8 is a flowchart showing another reception procedure by the wireless device 10. The control unit 46 and the reception unit 48 execute processing in the frequency channel CHy reception mode (S20). If the registration button is not depressed (N in S22), the process waits. If the registration button is pressed (Y in S22), the control unit 46 and the reception unit 48 execute processing in the frequency switching reception mode (S24). The registration unit 56 registers the first type terminal device 12 or the second type terminal device 14 (S26).

  According to the present embodiment, when a plurality of frequency channels are used, the frequency channels in one communication unit are switched, so that only one communication unit can be implemented. In addition, since only one communication unit is mounted, an increase in circuit scale can be suppressed. In addition, since only the frequency channel “CHx” is used when only at least one of the first type terminal device and the second type terminal device using the frequency channel “CHx” is registered, the first type terminal device is used. Alternatively, the reception probability of the packet signal from the second type terminal device can be improved. Further, when only the smart meter that uses the frequency channel “CHy” is registered, only the frequency channel “CHy” is used, so that the reception probability of the packet signal from the smart meter can be improved. Further, since the reception probability is improved, an increase in the probability of communication failure can be suppressed. In addition, when registering a new communication device that uses a frequency channel that has not been used, the two frequency channels are alternately used, so that it is possible to use a frequency channel that is not being used. Moreover, since the smart meter, the first type terminal device, or the second type terminal device can be registered by executing the processing in the frequency switching reception mode by pressing the registration button, the smart meter, the first type terminal device or There is no need for a dedicated registration button for each type 2 terminal device, and only one registration button is required, so that the device can be simplified.

  The outline of one embodiment of the present invention is as follows. The radio apparatus 10 according to an aspect of the present invention includes a reception unit 48 that performs one of reception processing in a first frequency channel and reception processing in a second frequency channel different from the first frequency channel, As a transmission device to be subjected to reception processing in the unit 48, a transmission device that uses one of the first frequency channel and the second frequency channel is registered, and a transmission device that uses the other frequency channel is registered. When not registered, the control unit 46 is configured to cause the receiving unit 48 to use one frequency channel and to make the other frequency channel unused. When registering a new transmission device that uses the other frequency channel, the control unit 46 causes the reception unit 48 to alternately use one frequency channel and the other frequency channel.

(Example 2)
Next, Example 2 will be described. The second embodiment is a wireless device that performs communication using a plurality of frequency channels, as in the first embodiment, and relates to processing for one of the frequency channels. In the first embodiment, when there is only one radio unit, it is possible to suppress detection of a signal on the other frequency channel even if a signal on the other frequency channel is received while detecting reception of the signal on the other frequency channel. Therefore, one frequency channel is fixedly used in accordance with the registration status. On the other hand, in the second embodiment, attention is paid to the fact that the frequency channel “CHx” can receive a packet signal including the preamble of the first communication and a packet signal including the preamble of the second communication. Under such circumstances, even if a pilot signal including the other preamble is received while detecting reception of the signal for one preamble, this is not detected. Therefore, it is desired to suppress an increase in the failure probability of reception detection for a plurality of types of preambles even though there is one radio unit.

  The wireless device registers in advance a communication device that uses the frequency channel “CHx”. One or more registered communication devices may use a common preamble. That is, there may be a situation where the wireless device only needs to receive a packet signal including one type of preamble. In this case, the radio apparatus performs reception detection of a packet signal by fixing the preamble to one preamble without executing preamble switching. The communication system 100 and the wireless device 10 according to the second embodiment are the same type as those in FIGS. Here, the difference will be mainly described.

  In the receiving unit 48 of FIG. 4, the frequency channel “CHx” is set by the control unit 46 in the second embodiment. Here, in the frequency channel “CHx”, the first communication 20 and the second communication 22 are used. Therefore, the reception unit 48 executes one of a packet signal reception process including the first communication 20 preamble and a packet signal reception process including the second communication 22 preamble. As described above, the preamble of the second communication 22 is different from the preamble of the first communication 20. In the reception unit 48, the preamble used for the frequency channel “CHx” is instructed by the control unit 46.

  When registered as shown in FIG. 5A, the control unit 46 instructs the reception unit 48 to switch between the two preambles at regular intervals as described above. Here, the period for setting the preamble of the first communication 20 and the period for setting the preamble of the second communication 22 may have different lengths. The operation of the receiving unit 48 at that time is as described above. Such an operation is also referred to as “preamble switching reception mode”.

  The control unit 46 checks the list stored in the storage unit 52. When the list is shown as shown in FIG. 5B, the control unit 46 causes the reception unit 48 to use one frequency channel and the other Make the frequency channel unused. Specifically, the control unit 46 instructs the use of only the preamble of the first communication 20 when one or more first type terminal devices 12 are registered and the second type terminal device 14 is not registered. To do. In addition, the control unit 46 instructs the use of only the preamble of the second communication 22 when one or more second type terminal devices 14 are registered and the first type terminal device 12 is not registered. The former is also called “first communication reception mode”, and the latter is also called “second communication reception mode”. The receiving unit 48 sets a frequency channel in accordance with an instruction from the control unit 46 and executes reception processing.

  As described above, when a new communication device is registered in the wireless device 10, the reception unit 54 receives an instruction to register a new communication device when the user depresses the registration button. Here, the new communication device refers to a communication device that does not use a preamble among communication devices that use the frequency channel “CHx”. When accepting the instruction, the accepting unit 54 notifies the control unit 46 to that effect. When the control unit 46 receives a notification from the reception unit 54, that is, when registering a new communication device that transmits a packet signal including the other preamble, the control unit 46 is instructed to the receiving unit 48 over a certain period. And the other preamble are used alternately. This corresponds to interrupting the “preamble switching reception mode” in the “first communication reception mode” or the “second communication reception mode”. The receiving unit 48 repeatedly switches between the preamble of the first communication 20 and the preamble of the second communication 22 over a certain period in accordance with an instruction from the control unit 46.

  FIG. 9 shows an outline of operations performed by the wireless device 10 according to the second embodiment of the present invention. The receiving unit 48 alternately sets two preambles in the preamble switching reception mode section (registration mode). When the type 2 terminal device registration completion 210 is reached, only the type 2 terminal device 14 is registered in the wireless device 10. In response, the control unit 46 sets the second communication reception mode. The receiving unit 48 sets only the preamble of the second communication 22 in the second communication reception mode section (communication mode). When registration acceptance 212 is made, the control unit 46 sets the preamble switching reception mode. The receiving unit 48 alternately sets two preambles in the preamble switching reception mode section (registration mode).

  When the first type terminal device registration is completed 214, the first type terminal device 12 and the second type terminal device 14 are registered in the wireless device 10. Accordingly, the control unit 46 continues the preamble switching reception mode. The receiving unit 48 continues to set two preambles alternately in the preamble switching reception mode section (communication mode). When the type 2 terminal device registration is canceled 216, only the type 1 terminal device 12 is registered in the wireless device 10. In response to this, the control unit 46 sets the first communication reception mode. The receiving unit 48 sets only the preamble of the first communication 20 in the first communication reception mode section (communication mode).

  The operation of the communication system 100 configured as above will be described. FIG. 10 is a flowchart illustrating a reception procedure by the wireless device 10 according to the second embodiment of the present invention. If it is a registration mode (Y of S50), the control part 46 and the receiving part 48 will perform the process by preamble switching reception mode (S52). If the registration mode is not set (N in S50), the registration unit 56 registers the first type terminal device 12 (Y in S54) and the second type terminal device 14 is registered (Y in S56). The unit 46 and the receiving unit 48 execute processing in the preamble switching reception mode (S58). If the 2nd type terminal device 14 is not registered by the registration part 56 (N of S56), the control part 46 and the receiving part 48 will perform the process by 1st communication reception mode (S60).

  If the first type terminal device 12 is not registered by the registration unit 56 (N in S54) and the second type terminal device 14 is registered (Y in S62), the control unit 46 and the reception unit 48 are Then, processing in the second communication reception mode is executed (S64). If the 2nd type terminal device 14 is not registered by the registration part 56 (N of S62), the control part 46 and the receiving part 48 will perform the process by preamble switching reception mode (S66).

  According to the present embodiment, when a plurality of preambles are used, the preamble in one communication unit is switched, so that it is only necessary to implement one communication unit. In addition, since only one communication unit is mounted, an increase in circuit scale can be suppressed. In addition, when only the first type terminal device using the first communication preamble is registered, only the first communication preamble is used, so that the reception probability of the packet signal from the first type terminal device can be improved. . In addition, when only the second type terminal device using the second communication preamble is registered, only the second communication preamble is used, so that the reception probability of the packet signal from the second type terminal device can be improved. . Further, since the reception probability is improved, an increase in the probability of communication failure can be suppressed. In addition, when registering a new communication device that uses a preamble that has not been used so far, the two preambles are used alternately, so that the unused preamble can be used.

  The outline of one embodiment of the present invention is as follows. The radio apparatus 10 includes a receiving unit 48 that performs one of a signal reception process including a first preamble and a signal reception process including a second preamble different from the first preamble. As a transmission device to be subjected to reception processing in the reception unit 48, a transmission device that transmits a signal including one of the first preamble and the second preamble is registered, and the other preamble is included. And a control unit 46 that causes the reception unit 48 to use one preamble and make the other preamble unused when the transmission device that transmits the received signal is unregistered. When registering a new transmission device that transmits a signal including the other preamble, the control unit 46 causes the reception unit 48 to alternately use one preamble and the other preamble.

  In the above, this invention was demonstrated based on the Example. This embodiment is an exemplification, and it will be understood by those skilled in the art that various modifications can be made to each of those constituent elements or combinations of processing processes, and such modifications are also within the scope of the present invention. .

  In the first and second embodiments of the present invention, the wireless device 10 is provided with one receiving antenna. However, the present invention is not limited to this. For example, the wireless device 10 may be provided with two or more receiving antennas. In that case, the radio apparatus 10 performs antenna diversity, compares RSSI with both antennas, and executes the processing so far with the larger RSSI. According to this modification, the reception probability can be improved.

  In the first and second embodiments of the present invention, the wireless device 10 uses two frequency channels. However, the present invention is not limited to this. For example, the wireless device 10 may use three or more frequency channels. In that case, the processing of the embodiment is executed for two of the three or more frequency channels. According to this modification, the degree of freedom of the configuration of the communication system 100 can be improved.

  10 wireless device (receiving device), 40 communication unit, 44 data processing unit, 46 control unit, 48 reception unit, 50 transmission unit, 52 storage unit, 54 reception unit, 56 registration unit, 100 communication system.

Claims (4)

A receiver that performs one of reception processing in a first frequency channel and reception processing in a second frequency channel different from the first frequency channel;
A transmission device that uses one of the first frequency channel and the second frequency channel is registered as a transmission device to be subjected to reception processing in the reception unit, and the other frequency channel is used. A control unit that causes the receiving unit to use one frequency channel and make the other frequency channel unused when the transmitting device is unregistered,
When the control unit registers a new transmission device that uses the other frequency channel, the control unit causes the reception unit to alternately use one frequency channel and the other frequency channel. . A receiving unit that performs one of a reception process of a signal including a first preamble and a reception process of a signal including a second preamble different from the first preamble;
A transmitting apparatus that transmits a signal including one of the first preamble and the second preamble is registered as a transmission apparatus to be subjected to reception processing in the receiving unit, and the other preamble is included. A control unit that causes the reception unit to use one preamble and the other preamble to be unused when the transmission device that transmits the received signal is unregistered,
The control unit, when registering a new transmission device that transmits a signal including the other preamble, causes the reception unit to alternately use one preamble and the other preamble. Receiver device. As a transmission apparatus to be subjected to reception processing, a transmission apparatus that uses one frequency channel of a first frequency channel and a second frequency channel different from the first frequency channel is registered, and the other When a transmitting device that uses a frequency channel is unregistered, using one frequency channel and not using the other frequency channel, and performing reception processing;
A program for causing a computer to execute a step of executing reception processing by alternately using one frequency channel and the other frequency channel when registering a new transmission device that uses the other frequency channel. As a transmission apparatus to be subjected to reception processing, a transmission apparatus that transmits a signal including one of a first preamble and a second preamble different from the first preamble is registered. When a transmitting apparatus that transmits a signal including the preamble of the first is unregistered, using one preamble and not using the other preamble, and executing reception processing;
A program for causing a computer to execute a step of executing reception processing by alternately using one preamble and the other preamble when registering a new transmission device that transmits a signal including the other preamble .

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