Wireless communication device

Abstract

The purpose of the present disclosure is to provide a wireless communication control method and a wireless communication device which make it possible to efficiently avoid noise influence. The wireless communication control method according to the present disclosure comprises: a first step for acquiring reception electric field intensity of a preamble signal received through wireless communication; and a second step for calculating a reception-sensitivity estimated value which is an estimated value for reception sensitivity, on the basis of a reception-sensitivity deterioration amount which is a deterioration amount of reception sensitivity resulting from operation of at least one interface and a wireless frequency for use in the wireless communication; and a third step for controlling operations of interfaces in operation, on the basis of the reception electric field intensity acquired in the first step and the reception-sensitivity estimated value calculated in the second step.

Description

Technical Field

[0001] The present disclosure , None relates to a line communication device.

Background Art

[0002] Conventionally, a wireless communication device has been disclosed that can avoid the influence of noise generated from a control unit during the operation of a receiving unit and maintain good reception sensitivity by stopping the operation of the control unit in accordance with the reception operation of the receiving unit (see, for example, Patent Document 1).

Prior Art Documents

Patent Documents

[0003]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0004] The wireless communication device disclosed in Patent Document 1 uses a time division multiple access (TDMA) system, and stops the operation of a part of the control unit, which is a noise radiation source, in accordance with the reception slot of TDMA. Therefore, there is a problem that it cannot be applied to other multiple access systems. Here, examples of other multiple access systems include a code division multiple access (CDMA) system, a frequency division multiple access (FDMA) system, a carrier sense multiple access with collision avoidance (CSMA / CA), and the like.

[0005] In addition, in the wireless communication device disclosed in Patent Document 1, among the operations of the control unit which is a noise radiation source, the operations of the LCD driver and the input / output control unit which are not directly necessary for wireless communication are stopped. Therefore, there is a problem that the operations of the control unit which have no influence on the reception operation of wireless communication are also stopped.

[0006] The present disclosure has been made to solve such problems, and it is possible to efficiently avoid the influence of noise None and an object is to provide a wireless communication device.

Means for Solving the Problems

[0007] In order to solve the above problems, according to the present disclosure The wireless communication device includes a wireless section that performs wireless communication with an external wireless communication device, at least one interface that connects to an external device, and a control section that controls the interface. The control section controls the operation of the operating interface based on the reception field strength of the signal being received by the wireless section from the external wireless communication device. .

Effects of the Invention

[0008] According to the present disclosure, since the operation of the interface during operation is controlled based on the received electric field strength and the estimated received sensitivity, it is possible to efficiently avoid the influence of noise.

[0009] The object, features, aspects, and advantages of the present disclosure will become clearer from the following detailed description and the accompanying drawings.

Brief Description of the Drawings

[0010]

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Embodiments for Carrying Out the Invention

[0011] <Embodiment 1> <Configuration> FIG. 1 is a block diagram showing an example of the configuration of the wireless communication device 1 according to Embodiment 1.

[0012] The wireless communication device 1 includes a wireless unit 2 and a control unit 3. The wireless unit 2 has an antenna and performs wireless communication with an external wireless communication device. In FIG. 1, two antennas are shown, which are a transmission antenna and a reception antenna, respectively. Thus, the wireless communication device 1 incorporates the wireless unit 2, and the wireless unit 2 performs wireless communication with an external wireless communication device.

[0013] The control unit 3 is wired-connected to the wireless unit 2 and communicates with the wireless unit 2 via wire. The control unit 3 includes a control CPU (Central Processing Unit) (not shown) and a plurality of interfaces 4, 5, 6, 7, 8 (hereinafter also referred to as "interfaces 4 to 8") for connecting to external devices. The control CPU controls the operations and non-operations of each of the interfaces 4 to 8.

[0014] <Operation> Figure 2 is a timing chart showing the control operation of the interfaces during wireless communication of the wireless communication device 1.

[0015] In Figure 2, "Wireless reception start" indicates the timing at which the wireless unit 2 receives data from an external wireless communication device. The data received by the wireless unit 2 from an external wireless communication device is composed of a "preamble", "SFD+PHR", and "payload".

[0016] The "preamble" is a signal for synchronization and is a bit sequence of a fixed pattern, which is added to the head of the data body. By receiving the preamble, the wireless unit 2 recognizes that data will be transmitted from an external wireless communication device. Hereinafter, the "preamble" is also referred to as a preamble signal.

[0017] The "SFD+PHR" is composed of a frame start delimiter (SFD) and a PHY header (PHR), and contains information such as the preamble length and the data format. The wireless unit 2 uses the "SFD+PHR" to handle the received data.

[0018] The "payload" is the data body received by the wireless unit 2 from an external wireless communication device excluding the header and destination information. Hereinafter, the "payload" is also referred to as a payload signal.

[0019] The wireless unit 2 measures the RSSI (Received Signal Strength Indicator) value, which is the received electric field strength (received power) of the preamble signal received from an external wireless communication device. Then, after the reception of the preamble signal is completed, the wireless unit 2 notifies the control unit 3 by wire communication of the measured RSSI value of the preamble signal and the radio frequency used for the wireless communication with the external wireless communication device.

[0020] Based on the RSSI value and radio frequency of the preamble signal notified from the wireless unit 2 and the reception sensitivity degradation amount of the wireless unit 2 during the operation of interfaces 4 to 8, the control unit 3 determines the interface to stop the operation from interfaces 4 to 8. Then, the control unit 3 controls the determined interface to stop the operation.

[0021] The reception sensitivity degradation amount of the wireless unit 2 during the operation of interfaces 4 to 8 refers to the degradation amount of the reception sensitivity point of the wireless unit 2 at an arbitrary radio frequency due to the noise generated during the operation of interfaces 4 to 8.

[0022] Figures 3 and 4 are diagrams showing an example of the reception sensitivity degradation amount of the wireless unit 2 during the operation of interfaces 4 to 8. In Figures 3 and 4, the vertical axis represents the reception sensitivity degradation amount [dB], and the horizontal axis represents the radio frequency [MHz]. Information on the reception sensitivity degradation amount of the wireless unit 2 during the operation of each of interfaces 4 to 8 as shown in Figures 3 and 4 is pre-held by the control unit 3 before the start of operation of the wireless communication device 1.

[0023] Figure 3 shows the relationship between the radio frequency during the operation of interface 4 and the reception sensitivity degradation amount of the wireless unit 2. Note that the values shown in Figure 3 are examples. Interface 4 is assumed to have an IC (Integrated Circuit) operating at a 25 MHz clock. The example of Figure 3 shows that the largest noise is radiated at 925 MHz, which is a harmonic of 25 MHz. As shown in Figure 3, when the radio frequency is 925 MHz, the reception sensitivity degradation amount of the wireless unit 2 is 10 dB.

[0024] FIG. 4 shows the relationship between the radio frequency during the operation of interface 7 and the amount of deterioration in the reception sensitivity of radio section 2. Note that the values shown in FIG. 4 are merely examples. Also, in the example of FIG. 4, it is assumed that when interface 7 is operating, more noise is generated at radio frequencies other than when the radio frequency is 925 MHz. As shown in FIG. 4, when the radio frequency is 925 MHz, the amount of deterioration in the reception sensitivity of radio section 2 is 2 dB.

[0025] As illustrated in FIGS. 3 and 4, the relationship between the radio frequency and the amount of deterioration in the reception sensitivity of radio section 2 differs for each type of interfaces 4 to 8.

[0026] Returning to the description of FIG. 2, after receiving the payload signal, radio section 2 notifies control section 3 of the reception completion.

[0027] Upon receiving the reception completion notification from radio section 2, control section 3 controls the interfaces whose operations have been stopped to resume operation.

[0028] FIG. 5 is a flowchart showing an example of the operation of wireless communication device 1, and specifically shows the operation of control section 3 that controls the operations of interfaces 4 to 8.

[0029] In step S11 (first step), control section 3 acquires the RSSI value and the radio frequency from radio section 2. Here, the RSSI value is the RSSI value of the preamble received by radio section 2 from an external wireless communication device. The lower the RSSI value, the lower the level of the received signal in radio section 2, and the higher the possibility of signal reception failure. Also, the radio frequency is the radio frequency used by radio section 2 for wireless communication with an external wireless communication device.

[0030] In step S12, the control unit 3 calculates the amount of deterioration [dB] in the reception sensitivity of the radio unit 2 during the operation of each interface 4 to 8. Specifically, the control unit 3 calculates the amount of deterioration [dB] in the reception sensitivity of the radio unit 2 when each interface 4 to 8 operates at the radio frequency acquired from the radio unit 2 based on the information indicating the relationship between the radio frequency held by itself and the amount of deterioration in the reception sensitivity of the radio unit 2. Note that the interfaces for which the amount of deterioration in reception sensitivity is calculated may be only the currently operating interfaces.

[0031] In step S13, the control unit 3 checks the currently operating interface and calculates the total value of the amount of deterioration in the reception sensitivity of the radio unit 2 related to the operating interface.

[0032] In step S14 (second step), the control unit 3 adds the total value of the amount of deterioration in reception sensitivity calculated in step S13 to the actual power value (reception sensitivity actual power value) of the reception sensitivity point of the radio unit 2, and calculates the estimated value of the reception sensitivity point of the radio unit 2 in the current state where the interface is operating. The lower the estimated value of the reception sensitivity point, the more possible it is to receive a signal with a lower level.

[0033] Here, the actual power value of the reception sensitivity point of the radio unit 2 refers to the reception sensitivity point of the radio unit 2 in a state where all interfaces 4 to 8 are not operating. The actual power value of the reception sensitivity point of the radio unit 2 is held in advance by the control unit 3.

[0034] In step S15, the control unit 3 compares the RSSI value acquired in step S11 with the estimated value of the reception sensitivity point calculated in step S14. As a result of the comparison, if the estimated value of the reception sensitivity is higher than the RSSI value, the process proceeds to step S16. On the other hand, if the estimated value of the reception sensitivity is less than or equal to the RSSI value, the process proceeds to step S17.

[0035] In step S16 (third step), the control unit 3 stops the operation of the interface among the operating interfaces for which the amount of deterioration in the reception sensitivity of the radio unit 2 is the largest. Then, the process proceeds to step S13.

[0036] For example, when interface 4 and interface 7 are in operation, the radio frequency used when the radio unit 2 performs wireless communication with an external wireless communication device is 925 MHz, and the amount of deterioration in the reception sensitivity of the radio unit 2 during the operation of interfaces 4 and 7 is the information shown in FIGS. 3 and 4, the control unit 3 stops the operation of interface 4 at which the amount of deterioration in the reception sensitivity of the radio unit 2 becomes maximum.

[0037] In step S17, when the estimated value of the reception sensitivity point is less than or equal to the RSSI value, it is estimated that the signal reception is successful, so the radio unit 2 enters the reception standby state for the payload signal.

[0038] From the above, it is possible to avoid the influence of noise by minimizing the number of interfaces to be stopped.

[0039] <Effect> From the above, in the first embodiment, the radio unit 2 notifies the RSSI value and the radio frequency of the received signal between receiving the preamble signal and receiving the payload signal, and the control unit 3 controls the operation of the interface before the start of receiving the payload signal. Therefore, it is possible to avoid radiated noise when receiving the payload signal.

[0040] Also, regardless of the type of the multi-connection method, it is possible to avoid the influence of radiated noise.

[0041] Furthermore, based on the radio frequency used when the radio unit 2 performs wireless communication with an external wireless communication device, an estimated value of the reception sensitivity point of the radio unit 2 during the operation of interfaces 4 to 8 is calculated, and an interface to stop the operation is determined based on the calculated estimated value of the reception sensitivity and the RSSI value. Thereby, the number of interfaces to be stopped can be minimized, and the radio unit 2 can maintain a state in which it can receive signals.

[0042] <Modification 1> In the above description, the case where the control unit 3 pre - holds the information on the reception sensitivity degradation amount has been explained, but it is not limited to this. The control unit 3 may not pre - hold the information on the reception sensitivity degradation amount.

[0043] Specifically, after the installation of the wireless communication device 1 and before the start of operation of the wireless communication device 1, the wireless unit 2 measures the reception sensitivity degradation amount of the wireless unit 2 during the operation of each of the interfaces 4 to 8, and notifies the control unit 3 of the information on the measured reception sensitivity degradation amount. The control unit 3 holds the information on the reception sensitivity degradation amount notified from the wireless unit 2.

[0044] The wireless unit 2 operates while changing the radio frequency for each of the interfaces 4 to 8 to measure the reception sensitivity points (measured reception sensitivity values) corresponding to the radio frequencies. Then, the wireless unit 2 calculates the reception sensitivity degradation amount of the wireless unit 2 when each of the interfaces 4 to 8 operates in the installation environment of the wireless communication device 1 by taking the difference between the measured value of the reception sensitivity point and the actual value of the reception sensitivity point of the wireless unit 2 corresponding to the radio frequency (fourth step). Note that the actual value of the reception sensitivity point of the wireless unit 2 is determined from a pre - test of the reception sensitivity point or the specifications of the wireless communication device 1. When the reception sensitivity degradation amount varies depending on the installation environment of the wireless communication device 1, the method of calculating the reception sensitivity degradation amount as described above is effective.

[0045] <Modification Example 2> In the above description, the case where the operation of the interface with the maximum reception sensitivity degradation amount among the operating interfaces is stopped has been explained, but it is not limited to this.

[0046] The control unit 3 may control to stop the operations in order from the interfaces with lower operation priorities (hereinafter simply referred to as "priorities").

[0047] Further, the control unit 3 may control the operations of the interfaces 4 to 8 in consideration of not only the priorities of the interfaces 4 to 8 but also the priority of the wireless unit 2. In this case, even if the wireless communication is greatly affected by noise and the wireless communication becomes impossible regardless of the operations of the interfaces, it is possible to continue the operations of the interfaces with high priorities.

[0048] FIG. 6 is a flowchart showing an example of the operation of the wireless communication device 1 according to the second modification. Since steps S21 to S25 in FIG. 6 are the same as steps S11 to S15 in FIG. 5, the description thereof is omitted here. Therefore, steps S26 to S28 will be described below. Also, it is assumed that the control unit 3 preliminarily holds the priorities of the interfaces 4 to 8 and the priority of the wireless unit 2.

[0049] In step S26, the control unit 3 compares the priority of the interface in operation among the interfaces 4 to 8 with the priority of the wireless unit 2, and determines whether the priority of the wireless unit 2 is the lowest. As a result of the determination, if the priority of the wireless unit 2 is the lowest, the process proceeds to step S28. On the other hand, if the priority of the wireless unit 2 is not the lowest, the process proceeds to step S27.

[0050] In step S27, the control unit 3 controls to stop the operation of the interface with the lowest priority among the interfaces in operation. Then, the process proceeds to step S23.

[0051] In step S28, when the estimated value of the reception sensitivity point is less than or equal to the RSSI value, it is estimated that the signal reception is successful, so the wireless unit 2 enters the reception standby state for the payload signal. Also, even when it is determined in step S25 that the estimated value of the reception sensitivity point is higher than the RSSI value, if it is determined in step S26 that the priority of the wireless unit 2 is the lowest, the wireless unit 2 enters the reception standby state for the payload signal.

[0052] In this way, by stopping the operation of only the interface with low priority, the radio unit 2 can maintain a state in which it can receive signals.

[0053] <Modification Example 3> In the above description, the case where the control unit 3 acquires the RSSI value and the radio frequency from the radio unit 2 has been described, but it is not limited to this.

[0054] When the radio frequency used for radio communication between the radio unit 2 and an external radio communication device is known and does not change, the control unit 3 does not acquire the radio frequency from the radio unit 2 and uses the known radio frequency. In this case, the control unit 3 holds the information of the known radio frequency in advance.

[0055] Also, when the control unit 3 cannot acquire the RSSI value from the radio unit 2, the control unit 3 uses the bit error rate (BER) or packet error rate (PER) calculated based on the past reception data received by the radio unit 2, etc., to convert it into an RSSI value. Since the conversion from the bit error rate or packet error rate to the RSSI value is performed based on the error rate characteristics, it is necessary to convert it according to the modulation method.

[0056] <Modification Example 4> In the above description, as shown in FIG. 2, the case where the radio unit 2 notifies the control unit 3 of the RSSI value and the radio frequency immediately after the reception of the preamble signal has been described, but it is not limited to this.

[0057] FIG. 7 is a timing chart showing the control operation of the interface during radio communication of the radio communication device 1 according to Modification Example 4. As shown in FIG. 7, the radio unit 2 may notify the control unit 3 of the RSSI value and the radio frequency immediately after the reception of the payload signal. In this case, it is effective for the radio unit 2 that cannot be controlled immediately after the reception of the preamble signal, and the radio unit 2 can avoid the influence of noise on the next signal to be received.

[0058] <Modification Example 5> In the above description, as shown in FIG. 1, the case where the control unit 3 has five interfaces 4 to 8 has been described, but the present invention is not limited to this. The control unit 3 may have a single or a plurality of interfaces.

[0059] <Embodiment 2> In Embodiment 1, the RSSI value of the received preamble signal and the radio frequency used for wireless communication with an external wireless communication device are notified from the radio unit 2 to the control unit 3, and the control unit 3 determines the interface to stop the operation based on the notified RSSI value and radio frequency. In Embodiment 2, instead of the RSSI value and the radio frequency, class information of the RSSI value (hereinafter referred to as "RSSI class (received electric field strength class)") is notified from the radio unit 2 to the control unit 3, and the case where the control unit 3 determines the interface to stop the operation based on the notified RSSI class will be described.

[0060] Note that the wireless communication device according to Embodiment 2 is the same as the wireless communication device 1 (see FIG. 1) according to Embodiment 1. Therefore, hereinafter, the wireless communication device according to Embodiment 2 will be described as the wireless communication device 1 shown in FIG. 1.

[0061] FIG. 8 is a timing chart showing the control operation of the interface during wireless communication of the wireless communication device 1 according to Embodiment 2.

[0062] The radio unit 2 measures the RSSI value, which is the received electric field strength (received power) of the preamble signal received from an external wireless communication device. Then, after the reception of the preamble signal is completed, the radio unit 2 determines the RSSI class from the measured RSSI value of the preamble signal (second step), and notifies the determined RSSI class to the control unit 3.

[0063] The control unit 3 determines whether to stop the operation of the interface based on the RSSI class notified from the radio unit 2 (first step, second step). The method for determining the interface to stop the operation is the same as that in Embodiment 1.

[0064] For example, similar to Embodiment 1, the control unit 3 may calculate the reception sensitivity degradation amount (third step) and control to stop the operation of the interface where the reception sensitivity degradation amount is maximized (second step).

[0065] FIG. 9 is a diagram showing an example of an interface control method according to the RSSI class in Embodiment 2. The RSSI class is determined based on the environment in which the wireless communication device 1 is used, prior consideration, and past operation results. In the example of FIG. 9, only when the RSSI class is "4", the interface to be stopped from the operating interface is determined.

[0066] <Effect> From the above, in Embodiment 2, since the wireless unit 2 notifies only the RSSI class, the amount of data notified from the wireless unit 2 to the control unit 3 can be reduced compared to Embodiment 1, and the processing time can be shortened. In Embodiment 2, the information of the RSSI class is 2 bits.

[0067] Also, since the control method of the interface is determined for each RSSI class, the number of interfaces to be stopped can be minimized, and the state in which the wireless unit 2 can receive signals can be maintained.

[0068] <Modification Example 1> In the above description, the case where there are four types of RSSI classes as shown in FIG. 9 has been described, but the present invention is not limited to this.

[0069] Any type of RSSI class may be set according to the transmission rate of the wired communication from the wireless unit 2 to the control unit 3 or the control method of the interface.

[0070] <Modification Example 2> In the above description, the case where the wireless unit 2 notifies the control unit 3 of the RSSI class immediately after the reception of the preamble signal as shown in FIG. 8 has been described, but the present invention is not limited to this.

[0071] FIG. 10 is a timing chart showing the control operation of the interface during wireless communication of the wireless communication device 1 according to Modification 2. As shown in FIG. 10, immediately after the reception of the payload signal is completed, the radio unit 2 may notify the control unit 3 of the RSSI class. In this case, it is effective for the radio unit 2 that cannot be controlled immediately after the reception of the preamble signal is completed, and the influence of noise can be avoided for the signal to be received next by the radio unit 2.

[0072] <Modification 3> The control unit 3 determines whether to stop the operation of the interface based on the RSSI class, and calculates an estimated value of the reception sensitivity point of the radio unit 2 corresponding to the radio frequency, similar to Embodiment 1, and determines the interface to stop the operation based on the calculated estimated value of the reception sensitivity point. In this case, the control unit 3 may acquire the radio frequency from the radio unit 2 or may hold a known radio frequency in advance.

[0073] <Hardware Configuration> Each function of the radio unit 2 and the control unit 3 in the wireless communication device 1 shown in FIG. 1 is realized by a processing circuit. That is, the wireless communication device 1 includes a processing circuit for performing wireless communication with an external wireless communication device and controlling the operation of the interface. The processing circuit may be dedicated hardware or a processor (also referred to as a CPU, central processing unit, processing device, arithmetic device, microprocessor, microcomputer, DSP (Digital Signal Processor)) that executes a program stored in a memory.

[0074] When the processing circuit is dedicated hardware, as shown in FIG. 11, the processing circuit 9 corresponds to, for example, a single circuit, a composite circuit, a programmed processor, a parallel programmed processor, an ASIC (Application Specific Integrated Circuit), an FPGA (Field Programmable Gate Array), or a combination thereof. Each function of the radio unit 2 and the control unit 3 may be realized by the processing circuit 9 respectively, or each function may be realized by one processing circuit 9 collectively.

[0075] When the processing circuit 9 is the processor 10 shown in FIG. 12, each function of the radio unit 2 and the control unit 3 is realized by software, firmware, or a combination of software and firmware. The software or firmware is described as a program and stored in the memory 11. The processor 10 realizes each function by reading and executing the program recorded in the memory 11. That is, the wireless communication device 1 includes a memory 11 for storing a program that will consequently execute the steps of wirelessly communicating with an external wireless communication device and controlling the operation of the interface. Also, these programs can be said to cause a computer to execute the procedures or methods of the radio unit 2 and the control unit 3. Here, the memory may be, for example, a non-volatile or volatile semiconductor memory such as a RAM (Random Access Memory), a ROM (Read Only Memory), a flash memory, an EPROM (Erasable Programmable Read Only Memory), an EEPROM (Electrically Erasable Programmable Read Only Memory), a magnetic disk, a flexible disk, an optical disk, a compact disk, a DVD (Digital Versatile Disc), etc., or any storage medium to be used in the future.

[0076] Note that, regarding the functions of the wireless unit 2 and the control unit 3, some functions may be realized by dedicated hardware, and other functions may be realized by software or firmware.

[0077] In this way, the processing circuit can realize each of the above functions by hardware, software, firmware, or a combination thereof.

[0078] Note that within the scope of the present disclosure, it is possible to freely combine each embodiment or appropriately modify or omit each embodiment.

[0079] Although the present disclosure has been described in detail, the above description is illustrative and not restrictive in all aspects. It is understood that countless variations not illustrated may be envisioned.

Explanation of Reference Numerals

[0080] 1 Wireless communication device, 2 Wireless unit, 3 Control unit, 4, 5, 6, 7, 8 Interface, 9 Processing circuit, 10 Processor, 11 Memory.

Claims

1. A radio section that performs radio communication with an external radio communication device, At least one interface for connecting to an external device, A control section for controlling the interface, comprising The control section controls the operation of the interface in operation based on the reception electric field strength of a signal being received by the radio section from the external radio communication device. A radio communication device.

2. The radio section notifies the control section of a reception electric field strength class determined according to the reception electric field strength of a signal received from the external radio communication device, The control section controls the operation of the interface in operation based on the reception electric field strength class determined according to the reception electric field strength. The radio communication device according to claim 1.

3. The control section determines whether to stop the operation of the interface in operation based on the reception electric field strength class. The radio communication device according to claim 2.

4. The control section stops the operation of the interface for which the reception sensitivity degradation amount, which is the amount of degradation of reception sensitivity caused by the operation of the interface, is maximized. The radio communication device according to claim 3.

5. The radio section receives a signal including a preamble signal and a payload signal from the external radio communication device, and notifies the control section of the reception electric field strength class after completion of reception of the preamble signal or the payload signal. The radio communication device according to any one of claims 1 to 4.

6. The radio section notifies the control section of the reception electric field strength of a signal being received from the external radio communication device, The control section calculates a reception sensitivity estimated value, which is an estimated value of reception sensitivity, based on the reception sensitivity degradation amount, which is the amount of degradation of reception sensitivity caused by the operation of the interface, and the radio frequency used in the radio communication, and controls the operation of the interface in operation based on the reception electric field strength and the reception sensitivity estimated value. The radio communication device according to claim 1.

7. The wireless unit notifies the control unit of the reception electric field strength of a signal being received from the external wireless communication device, and the control unit stops the operation of the interface among the interfaces in operation, which has the largest reception sensitivity degradation amount that is the degradation amount of reception sensitivity caused by the operation of the interface, based on the reception electric field strength class determined according to the reception electric field strength. The wireless communication device according to claim 1.

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