JP2018078477A - Radio communication equipment - Google Patents

Abstract

PROBLEM TO BE SOLVED: To resolve the problem that a consumption power is increased in the conventional radio communication equipment.SOLUTION: In radio communication equipment, an external antenna device 20 includes: an antenna ANT; and a radio wave intensity display part that indicates a reception strength of a wireless signal. A terminal device 10 that performs a wireless communication through the external antenna device 20 includes: a radio wave measurement part 13 that calculates the reception strength of the external antenna device 20 on the basis of the receiving signal; a received radio wave determination part 14a that determines a propriety level of a radio wave environment of a place where the external antenna device 20 is arranged on the basis of the reception strength; a timer 14b that measures a time for maintaining the level so that it is determined that the priority level of the radio wave environment is proper; and a control part 11 that determines a display pattern of a radio wave intensity display part 21 in accordance with the priority level, and indicates the display by the determined display pattern to the radio wave intensity display part 21. The control part 11 turns off the display of the radio wave intensity display part 21 in accordance with maintaining of the proper level of the radio wave environment for a constant time or more.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a wireless communication device, and for example, an external antenna device that transmits and receives wireless signals and a terminal device that generates a signal to be transmitted from the wireless transmitting and receiving device and performs processing related to the received signal are provided as separate housings. The present invention relates to a communication device.

  In recent years, many wireless communication devices such as smart meters have been proposed that monitor the operation status of devices to be monitored via wireless communication. Such a smart meter may target a device such as a gas meter that is placed in a place with poor visibility. Therefore, in the smart meter, the antenna of the wireless communication device is separated from the terminal device to be an external antenna device, and the reception strength of the wireless signal is increased. However, the terminal device that can grasp the reception strength of the external antenna device may be placed at a position that cannot be seen from the installation location of the external antenna device, and it is difficult to install the external antenna device at a position with good radio wave environment. There is. Therefore, Patent Document 1 discloses a technique for grasping the radio wave condition of an external antenna device installed at a position distant from the terminal device.

  In the technique described in Patent Document 1, in a receiving device that demodulates a signal received by an antenna and input via a cable, a demodulating unit that demodulates a signal supplied via the cable, and an antenna from the output of the demodulating unit Detecting means for detecting a signal corresponding to the direction of the output, and an output means for generating a signal for performing a predetermined notification corresponding to the direction of the antenna in accordance with the detection result of the detecting means and outputting it via a cable With. The detecting means detects the level of the signal supplied via the cable.

JP 08-293720 A

  Many smart meters and the like are driven by a battery, and reduction of power consumption is required. However, the technique described in Patent Document 1 has a problem that there is no means for stopping the monitoring of the radio field intensity, and the power consumption required for the monitoring of the radio field intensity increases.

  One aspect of a wireless communication device according to the present invention is an external antenna device that transmits and receives a wireless signal, and a transmission signal that is transmitted as the wireless signal is output to the external antenna device, and based on the wireless signal received by the wireless communication device. A terminal device that receives a generated reception signal and performs a predetermined process, and the external antenna device includes an antenna and a radio wave intensity display unit that indicates a reception strength of the radio signal, and the terminal device A radio wave measuring unit that calculates the reception strength of the external antenna device based on the received signal, and a received radio wave determination unit that determines the suitability level of the radio wave environment of the place where the external antenna device is installed based on the reception strength; A timer for measuring a time for maintaining a level at which the suitability level of the radio wave environment is determined to be good, and a display pattern of the radio wave intensity display unit according to the suitability level And a control unit that instructs the radio wave intensity display unit to display the determined display pattern, and the control unit sets a level at which the suitability level of the radio wave environment is determined to be good for a predetermined time or more. The display of the radio field intensity display unit is turned off in response to the maintenance for the period.

  According to the wireless communication apparatus according to the present invention, the display of the radio wave intensity display unit is turned off when the measurement of the radio wave environment is completed, so that it is possible to reduce the power consumption required after the measurement of the radio wave environment.

  According to the wireless communication apparatus according to the present invention, the power consumption of the apparatus can be reduced.

1 is a block diagram of a wireless communication apparatus according to a first exemplary embodiment. 3 is a flowchart showing a flow of radio wave environment measurement processing of the wireless communication apparatus according to the first exemplary embodiment; FIG. 3 is a diagram illustrating an example of a display pattern for each radio wave intensity level in the wireless communication apparatus according to the first embodiment. FIG. 3 is a block diagram of a wireless communication apparatus according to a second exemplary embodiment. FIG. 6 is a block diagram of a wireless communication apparatus according to a third exemplary embodiment. 10 is a flowchart showing a flow of radio wave environment measurement processing of the wireless communication apparatus according to the third exemplary embodiment. FIG. 6 is a block diagram of a wireless communication apparatus according to a fourth embodiment. 14 is a flowchart illustrating an operation of an antenna movement notification process performed when acceleration equal to or greater than a predetermined value is applied to an external antenna device in the wireless communication device according to the fourth embodiment.

Embodiment 1
Embodiments of the present invention will be described below with reference to the drawings. For clarity of explanation, the following description and drawings are omitted and simplified as appropriate. In the drawings, the same elements are denoted by the same reference numerals, and redundant description is omitted as necessary.

  The wireless communication device described below describes an example in which communication is performed with a base unit or a base station using a wireless signal. However, as a communication method, wireless LAN standards such as IEEE802.11n and IEEE802.11ac, 3G (Third Generation) Lines, LTE (Long Term Evolution) lines, etc. can be applied.

  First, FIG. 1 shows a block diagram of a wireless communication apparatus 1 according to the first embodiment. As illustrated in FIG. 1, the wireless communication device 1 according to the first embodiment includes a terminal device 10 and an external antenna device 20. The external antenna device 20 is a device that transmits and receives radio signals, and is provided as a separate housing from the terminal device 10. The terminal device 10 outputs a transmission signal to be transmitted as a radio signal to the external antenna device 10 and performs a predetermined process upon receiving a reception signal generated based on the radio signal received by the external antenna device 10. In the wireless communication device 1 according to the first embodiment, the terminal device 10 and the external antenna device 20 transmit a transmission signal and a reception signal via the transmission / reception signal transmission cable 31, and transmit the transmission signal and the reception signal via the control signal transmission cable 32. Transmits a control signal for controlling the external antenna device 20. The transmission / reception signal transmission cable 31 and the control signal transmission cable 32 may be a single cable.

  The terminal device 10 includes a control unit 11, a memory 12, a radio wave measurement unit 13, and a determination unit 14. The control unit 11 is a processing unit for exhibiting the functions of the terminal device 10 and is a functional circuit that can execute a program such as a CPU (Central Processing Unit). The control unit 11 also generates a transmission signal corresponding to data generated based on the processing and performs a demodulation process on a reception signal obtained from the external antenna device 20. Further, the control unit 11 uses the memory 12, the radio wave measurement unit 13, and the determination unit 14 to control reception intensity monitoring of the external antenna device 20 and display of the monitoring result on the radio wave intensity display unit 21.

  The memory 12 is a storage place for data generated when controlling the reception intensity monitoring of the external antenna device 20 and the display of the monitoring result on the radio wave intensity display unit 21. The radio wave measurement unit 13 calculates a value indicating the reception intensity of the external antenna device 20 from the signal level of the reception signal received by the control unit 11. The determination unit 14 determines the level of reception intensity. The determination unit 14 includes a received radio wave determination unit 14a and a timer (for example, a counter 14b). Then, the received radio wave determination unit 14 a determines the suitability level of the radio wave environment of the place where the external antenna device 20 is installed based on the reception intensity calculated by the radio wave measurement unit 13. The counter 14 b is used for measuring a predetermined time used when the terminal device 10 monitors the reception sensitivity of the external antenna device 20. Specifically, the counter 14b measures the time for maintaining the level at which the suitability level of the radio wave environment is determined to be good.

  The external antenna device 20 includes an antenna ANT and a radio wave intensity display unit 21. The antenna ANT converts a radio signal into a reception signal transmitted via the transmission / reception signal transmission cable 31 and converts a transmission signal output from the terminal device 10 into a radio signal. The radio wave intensity display unit 21 indicates the reception intensity of a radio signal. The radio wave intensity display unit 21 is, for example, an LED, and a plurality of lighting patterns are prepared depending on differences in emission color, switching between lighting and blinking, blinking interval, and the like.

  Next, the operation of the wireless communication apparatus 1 according to the first embodiment will be described. Here, a radio wave environment measurement process for determining whether or not the radio wave environment around the external antenna device 20 is one of the characteristics of the wireless communication device 1 will be described. Note that other operations of the wireless communication device 1 conform to the operations of a general wireless communication device. FIG. 2 is a flowchart showing a flow of radio wave environment measurement processing of the wireless communication apparatus according to the first embodiment.

  As shown in FIG. 2, the radio wave environment measurement process of the wireless communication device 1 according to the first embodiment is performed as one of the installation work of the external antenna device 20. Therefore, in the radio wave environment measurement process according to the first embodiment, first, the external antenna device 20 is installed at a predetermined position (step S1). Next, in the radio wave environment measurement process according to the first exemplary embodiment, a specific radio wave environment measurement process is started in response to the activation of the wireless communication device 1 or the occurrence of an incommunicable state in the wireless communication device 1. (Step S2). When the wireless communication device 1 is activated, the terminal device 10 and the external antenna device 20 start to operate.

  Next, in the radio wave environment measurement process according to the first embodiment, the radio wave reception status around the external antenna device 20 is observed (step S3). In this step S3, reception generated from the radio signal received by the external antenna device 20 is performed. The radio wave measuring unit 13 calculates the reception intensity of the external antenna device based on the signal.

  Next, in the radio wave environment measurement process according to the first exemplary embodiment, the lighting pattern of the LED provided in the radio wave intensity display unit 21 is determined (step S4). In step S4, the received radio wave determination unit 14a determines the reception level based on the reception intensity calculated by the radio wave measurement unit 13, and the control unit 11 determines a lighting pattern corresponding to the determined reception level. Here, an example of this lighting pattern will be described with reference to FIG. FIG. 3 is a diagram illustrating an example of a display pattern for each radio wave intensity level in the wireless communication apparatus according to the first embodiment. As shown in FIG. 3, in the wireless communication device 1 according to the first embodiment, when the reception intensity is at a level that is out of service area where communication is not possible, the LED is turned on in color b (for example, red). Further, when the reception intensity is a low level that is a low-speed and unstable level of communication, the LED is set to a color a (for example, green) and blinks at intervals of 1 second. Further, when the reception intensity is medium level, which is an unstable level although communication is fast, the LED is set to color a and blinks at intervals of 0.5 seconds. Further, when the reception intensity is a high level at which communication is fast and stable, the LED is turned on in color a. In step S4, based on the lighting pattern determined, the control unit 11 gives a lighting instruction to the radio wave intensity display unit 21 of the external antenna device 20 (step S5).

  Next, in the wireless communication device 1 according to the first embodiment, whether or not the lighting pattern of the LED determined by the control unit 11 is such that the reception intensity exceeds a preset radio wave stability range (for example, reception intensity of medium level or higher). Is determined (step S6). It is assumed that the process of step S6 is performed in the control unit 11.

  If it is determined in step S6 that the reception intensity is below the radio wave stability range, the control unit 11 resets the counter 14b to initialize the radio wave stability reception timer (step S12). In such a case, the installation operator of the wireless communication device 1 moves the position of the external antenna device 20 to a position where the reception strength is considered to increase (step S11). And the radio | wireless communication apparatus 1 repeats step S3 to step S6 until reception intensity exceeds a radio wave stable range.

  On the other hand, when it is determined in step S6 that the reception intensity exceeds the radio wave stability range, the control unit 11 of the wireless communication device 1 operates the counter 14b to count up the radio wave stability reception timer (step S7). Then, the control unit 11 determines whether or not the reception intensity is maintained beyond the radio wave stability range for a period of a certain time or longer while monitoring the count value of the counter 14b (step S8).

  In step S8, when it is determined that the reception intensity cannot maintain the radio wave stable range for a period of a certain time or longer, the wireless communication device 1 repeats the processing from step S3 through the processing in steps S12 and S11. On the other hand, when it is determined in step S8 that the reception intensity has maintained the radio wave stability range for a period of a certain time or longer, the control unit 11 of the wireless communication device 1 instructs the radio wave intensity display unit 21 to turn off the LED ( Step S9). Moreover, the control part 11 initializes the radio wave stable reception timer by initializing the count value of the counter 14b (step S10). Then, when the process of step S10 is completed, the radio wave environment measurement process ends, and the wireless communication device 1 starts normal operation.

  From the above description, in the wireless communication device 1 according to the first embodiment, the external antenna device 20 has the radio wave intensity display unit 21 that performs display for determining whether the surrounding radio wave environment of the external antenna device 20 is good or bad. As a result, the wireless communication device 1 according to the first embodiment can install the external antenna device 20 at a position where the radio wave environment is favorable even at a position that cannot be seen from the terminal device 10.

  Further, in the radio communication device 1 according to the first embodiment, when an optimum installation position in which the surrounding radio wave environment of the external antenna device 20 is favorable is found in the radio wave environment measurement process, the radio field intensity display unit 21 displays Turns off. Thereby, in the radio | wireless communication apparatus 1 concerning Embodiment 1, the electric power required for the measurement of a radio wave environment after a radio wave environment measurement process can be reduced.

  In the wireless communication device 1 according to the first embodiment, the radio wave intensity display unit 21 displays the appropriateness level of the reception intensity by the difference in the emission color and lighting pattern of the lamp. By performing such a simple display, the wireless communication apparatus 1 reduces power consumption.

  In addition, in the wireless communication device 1 according to the first embodiment, it is determined that the surrounding radio wave environment of the external antenna device 20 is good when the reception intensity exceeds the radio wave stability range for a certain period. Thereby, in the wireless communication apparatus 1 according to the first embodiment, a position where a good radio wave environment can be continuously obtained can be determined as the optimum installation position of the external antenna device 20. This is a great merit in the wireless communication apparatus 1 that is regularly installed.

Embodiment 2
In the second embodiment, a wireless communication apparatus 2 that is another form of the wireless communication apparatus 1 according to the first embodiment will be described. FIG. 4 is a block diagram of the wireless communication apparatus 2 according to the second embodiment.

  As illustrated in FIG. 4, the wireless communication device 2 includes a terminal device 10 a instead of the terminal device 10. The terminal device 10a is obtained by adding a terminal-side radio wave intensity display unit (for example, a radio wave intensity display unit 15) to the terminal device 10. The radio field intensity display unit 15 has the same configuration as the radio field intensity display unit of the external antenna device, and operates based on a control signal given to the radio field intensity display unit 21 via the control signal transmission cable 32.

  In a housing complex or the like, when a plurality of wireless communication devices are fixedly installed, the communication state of a specific wireless communication device may deteriorate due to radio wave interference or the like. When the wireless communication apparatus 1 according to the first embodiment is installed, radio wave interference can be avoided by installing the external antenna apparatus 20 at a location away from the apparatus. However, when a plurality of wireless communication devices are installed, a plurality of external antenna devices 20 are also installed, and it is difficult to identify a terminal device whose communication state has deteriorated among the plurality of external antenna devices 20. .

  However, in the wireless communication device 2 according to the second embodiment, since the terminal device 10 side is also provided with the radio wave intensity display unit 15 similar to the radio wave intensity display unit 21 of the external antenna device 20, the radio wave intensity display unit Based on the display of 15, the terminal device 10 whose communication state has deteriorated can be identified.

Embodiment 3
In the third embodiment, a wireless communication apparatus 3 that is another form of the wireless communication apparatus 1 according to the first embodiment will be described. FIG. 5 is a block diagram of the wireless communication apparatus 3 according to the third embodiment.

  As illustrated in FIG. 5, the wireless communication device 3 according to the third embodiment is obtained by replacing the terminal device 10 with the terminal device 10b and replacing the external antenna device 20 with the external antenna device 20a.

  The terminal device 10b is obtained by replacing the control unit 11 with a control unit 11b. The control unit 11b has a function of starting a radio wave environment measurement process based on an operation instruction signal from the external antenna device 20a.

  The external antenna device 20 a is obtained by adding an operation switch 22 to the external antenna device 20. The operation switch 22 validates the display on the radio wave intensity display unit 21 and instructs the terminal device 10b to start the suitability determination of the radio wave environment.

  Next, the operation of the wireless communication device 3 according to the third embodiment will be described. As shown in FIG. 3, in the radio wave environment measurement process of the wireless communication apparatus 3 according to the third embodiment, the process of step S2 described in FIG. 2 is replaced with the process of step S22. In step S <b> 22, the wireless communication device 3 according to the third embodiment performs specific processing of the radio wave environment measurement processing based on the control signal generated when the operation switch 22 is depressed in addition to the activation of the wireless communication device 3. (For example, the processing of steps S3 to S12) is executed.

  From the above description, the radio communication device 3 according to the third embodiment can execute the radio wave environment measurement process due to the operation switch 22 being pushed down. Thereby, in the wireless communication device 3 according to the third embodiment, if the wireless communication device 3 is activated, the radio wave environment measurement process can be performed at an arbitrary timing of the installation worker.

  Specifically, when an event for correcting the position of the antenna occurs due to some circumstances such as a natural disaster or an accident during the operation of the wireless communication device, the wireless communication device 1 according to the first embodiment is completely The observation of the surrounding radio waves cannot be started unless either the communication is disabled or the apparatus is turned off. For example, even when the wireless communication apparatus is in a communicable state, when it is desired to perform maintenance because communication performance has deteriorated, the wireless communication apparatus 1 according to the first embodiment has a large antenna in order to make the apparatus incapable of communication. It is conceivable to start the radio wave environment measurement process by a method such as moving or temporarily covering the antenna with a blocking wall in order to block radio waves. However, the construction work is increased only for starting the radio wave environment measurement process, which is not rational as a method for starting the radio wave environment measurement process. Also, shutting off the power supply of the wireless communication device cannot be easily performed because data and settings necessary for operation may be lost.

  However, in the wireless communication device 3 according to the third embodiment, the operation switch 22 is installed in the external antenna device 20, and the radio wave environment measurement process can be started by pressing the operation switch 22. That is, in the wireless communication device 3 according to the third embodiment, it is possible to start the radio wave environment measurement process without changing the status of the antenna or the wireless communication device, thereby realizing the efficiency of the construction work.

  In the first embodiment, since the radio wave environment measurement process is started when the wireless communication apparatus becomes unable to communicate, the radio wave environment measurement process is continued until the worker starts the repair work. Cause. However, in the wireless communication device 3 according to the third embodiment, the operation period of the radio wave environment measurement process can be suppressed by controlling the start of the radio wave environment measurement process with the operation switch 22, and the power consumption can be reduced.

Embodiment 4
In the fourth embodiment, a wireless communication apparatus 4 that is another form of the wireless communication apparatus 3 according to the third embodiment will be described. FIG. 7 is a block diagram of the wireless communication apparatus 4 according to the fourth embodiment.

  As illustrated in FIG. 7, the wireless communication device 4 according to the fourth embodiment is obtained by replacing the terminal device 10b with the terminal device 10c and replacing the external antenna device 20a with the external antenna device 20b.

  The terminal device 10c is obtained by replacing the control unit 11b with the control unit 11c. The control unit 11c has a function of performing an antenna movement notification process based on acceleration information from the external antenna device 20b.

  The external antenna device 20b is obtained by adding an acceleration sensor 23 to the external antenna device 20a. The acceleration applied to the acceleration sensor 23 and the external antenna device 20b is detected. The acceleration sensor 23 is a device for measuring the acceleration of an object, and can measure the vibration of the object, the impact applied to the object, or the gravity applied to the object. The acceleration sensor 23 includes an analog output sensor and a digital output sensor, and any of them may be used.

  In the wireless communication device 4 according to the fourth embodiment, the antenna movement notification process is performed based on the acceleration information obtained from the acceleration sensor 23. The antenna movement notification process will be described below.

  FIG. 8 is a flowchart showing an antenna movement notification process performed when acceleration of a predetermined value or more is applied to the external antenna device in the wireless communication device 4 according to the fourth embodiment.

  As shown in FIG. 8, in the wireless communication device 4 according to the fourth embodiment, the acceleration sensor 23 moves the antenna in response to the acceleration exceeding the specified value for the external antenna device 20 b being detected by the control unit 11 c. A notification process is performed (step S31).

  In this antenna movement notification process, it is first determined whether or not the wireless communication device 4 is in a state in which wireless communication is possible (step S32) according to the detection result of step S31. When it is determined in step S32 that wireless communication is possible, the wireless communication device 4 notifies the administrator that the antenna has moved from the terminal device 10c using wireless communication (step S33). On the other hand, if it is determined in step S32 that wireless communication is impossible, the wireless communication device 4 cannot communicate with the base station or other wireless communication terminals. Therefore, the administrator recognizes that communication with the wireless communication device 4 has been interrupted via the base station or the like (step S34). However, in the case of the wireless communication device 4 equipped with other communication means such as a telephone line in addition to wireless communication, notification of antenna movement is made to the base station and other connected terminals using means other than wireless. Is also possible.

  When the process of step S33 or step S34 is completed, the control unit 11c of the wireless communication apparatus 4 according to the fourth embodiment instructs the radio wave intensity display unit 21 to light the LED in a predetermined pattern (step S35). ), And fixed so that the output level of the radio signal is equal to or lower than the predetermined output level (step S36).

  From the above description, when the wireless communication device 4 according to the fourth embodiment detects the possibility that the external antenna device 20b has moved by the acceleration sensor 23, the wireless communication device 4 notifies the administrator. As a result, the administrator can immediately know the necessity of correcting the installation position of the external antenna device 20b. Further, the wireless communication device 4 according to the fourth embodiment can know the wireless communication device that may have moved the external antenna device 20b from the radio wave intensity display unit 15 provided in the external antenna device 20c. Therefore, it is possible to immediately specify the external antenna device 20b that may have moved by using the wireless communication device 4 according to the fourth embodiment. In addition, the wireless communication device 4 according to the fourth embodiment limits the output level of the wireless signal to be within a certain range after detecting the possibility that the external antenna device 20b has moved. Thereby, the radio communication apparatus 4 according to the fourth embodiment can reduce radio wave interference with other communication apparatuses.

  More specifically, as a method for recognizing that correction is necessary when an event that corrects the position of an antenna occurs due to a natural disaster or accident during operation of a wireless communication device, Embodiments 1 to 3 are used. In such a wireless communication apparatus, a method for confirming that the wireless communication terminal is completely incapable of communication and cannot be communicated with the corresponding wireless communication terminal at the base station can be considered. However, if it is used for the purpose of hindering operation by blocking communication, the situation where communication is impossible should be avoided. Therefore, by using the wireless communication device 4 according to the fourth embodiment, the wireless communication device 4 in which communication is unstable is identified, and the position of the external antenna device is corrected before communication becomes impossible, thereby stabilizing the system. Can be improved.

  Further, when the electric field strength that has been received so far decreases due to the movement of the antenna, the wireless communication terminal increases the wireless output level to maintain the performance when the communication performance deteriorates, which causes radio wave interference. If the antenna position is re-corrected by the administrator's work, the radio wave environment will be stabilized again, so if communication is still possible even if the reception performance declines, it is better to maintain the current status without increasing the wireless output The influence on other wireless communication terminals is reduced.

  Note that the present invention is not limited to the above-described embodiment, and can be changed as appropriate without departing from the spirit of the present invention.

1 to 4 wireless communication device 10 terminal device 11 control unit 12 memory 13 radio wave measurement unit 14 determination unit 14a received radio wave determination unit 14b counter 15 radio wave intensity display unit 20 external antenna device 21 radio wave intensity display unit 22 operation switch 23 acceleration sensor ANT antenna 31 Transmission / reception signal transmission cable 32-34 Control signal transmission cable

Claims (7)

An external antenna device for transmitting and receiving radio signals;
A terminal device that outputs a transmission signal to be transmitted as the radio signal to the external antenna device and receives a reception signal generated based on the radio signal received by the terminal device and performs a predetermined process;
The external antenna device is
An antenna,
A radio field intensity display unit indicating a reception intensity of the radio signal,
The terminal device
A radio wave measurement unit that calculates a reception intensity of the external antenna device based on the reception signal;
A received radio wave determination unit that determines the suitability level of the radio wave environment of the place where the external antenna device is installed based on the received intensity;
A timer for measuring a time for maintaining a level at which the suitability level of the radio wave environment is determined to be good;
A control unit that determines a display pattern of the radio field intensity display unit according to the suitability level, and instructs the radio field intensity display unit to display the determined display pattern;
The said control part is a radio | wireless communication apparatus which light-extinguishes the display of the said radio field intensity display part according to having maintained the level judged that the suitability level of the said radio wave environment is favorable for a period more than fixed time.   The wireless communication device according to claim 1, wherein the external antenna device and the terminal device transmit and receive the transmission signal, the reception signal, and the indication signal of the display pattern via a cable connecting two devices.   The radio communication apparatus according to claim 1, wherein the radio wave intensity display unit displays the suitability level based on a difference in lamp emission color and lighting pattern.   4. The wireless communication device according to claim 1, wherein the terminal device includes a terminal-side radio wave intensity display unit having the same configuration as the radio wave intensity display unit of the external antenna device. 5.   5. The external antenna device according to claim 1, further comprising an operation switch that validates display on the radio field intensity display unit and instructs the terminal device to start determining whether or not the radio wave environment is appropriate. 6. The wireless communication device described. The external antenna device has an acceleration sensor that detects acceleration applied to the device,
When the control unit of the terminal device detects that an acceleration exceeding a preset allowable movement range is applied to the external antenna device by the acceleration sensor, the output level of the radio signal is set within a certain range. The radio communication apparatus according to claim 1, wherein the signal level of the transmission signal is suppressed so as to satisfy the following condition. In the terminal device, when it is detected by the acceleration sensor that an acceleration exceeding a preset movement allowable range is applied to the external antenna device,
The wireless communication device according to claim 6, wherein if the terminal device is in a communicable state, the wireless communication device notifies the administrator to confirm the position of the external antenna device using wireless communication.

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