JP2006109131A - Radio communication apparatus - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a radio communication apparatus capable of changing antennas by a simple configuration. <P>SOLUTION: The apparatus has a transceiver 10 for performing transmission and reception to and from a portable radio communication apparatus; an A antenna 1 and a B antenna 2 having directivity to the inside of a vehicle; an antenna changeover portion 3 for connecting either the A antenna 1 or B antenna 2 to the transceiver 10; passenger sensors 5-9 for detecting the arrangement of passengers including a driver inside the vehicle; and a controller 4 which stores an antenna selecting table 4a in which combination of each arrangement of passengers and an antenna to be used is represented corresponding to each other, and selects an antenna to be connected by the changeover portion 3 on the basis of the arrangement of the passengers detected by the passenger sensors 5-9 by referring to this selecting table 4a. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a wireless communication device that communicates with a portable wireless communication device inside a vehicle.

Conventionally, this type of wireless communication device is known to have a frame synchronization circuit and a timing circuit, and by switching the antenna for each burst, a diversity effect can be obtained even when the data reception signal strength changes rapidly. (For example, refer to Patent Document 1).
JP-A-6-45970

  However, the conventional wireless communication device includes a timing circuit for fast antenna switching in units of data frames that is not necessarily required when communicating with a portable wireless communication device in a limited space such as the interior of a vehicle. Therefore, there has been a problem that an increase in failure probability and an increase in manufacturing cost are caused due to the complicated configuration.

  The present invention has been made to solve such a problem, and an object of the present invention is to provide a wireless communication apparatus capable of switching antennas with a simple configuration.

  The wireless communication device according to the present invention includes a transmission / reception unit that transmits / receives data to / from a portable wireless communication device, a plurality of first antennas having directivity inside a vehicle, and the transmission / reception of any of the first antennas. Stored in the storage means, an antenna switching means connected to the means, a detection means for detecting the arrangement of the occupant in the vehicle, a storage means for storing a table in which combinations of the occupant arrangement and the antenna to be used are associated with each other. And an antenna selection means for selecting an antenna to be connected by the antenna switching means based on the occupant arrangement detected by the detection means.

  With this configuration, the antenna is switched based on the occupant arrangement detected by the detection means with reference to the table that associates the occupant arrangement with the antenna combination to be used. Therefore, the antenna can be switched with a simple configuration. it can.

  In the wireless communication device of the present invention, the detection means includes a weight sensor provided in a seat of the vehicle, and the weight sensor detects the position of the occupant by measuring the weight on the seat. It is composed.

  With this configuration, since the weight sensor and the vehicle-side control unit included in the smart airbag system provided on the vehicle side can be used together, the antenna can be switched with a much simpler configuration.

  In the wireless communication device of the present invention, the detection means includes a non-contact sensor provided in the vicinity of the seat of the vehicle and detects an object on the seat, and the non-contact sensor detects an occupant's arrangement. It is composed.

  With this configuration, even when the vehicle seat is not equipped with a weight sensor or when it is difficult to install the weight sensor in the seat, the occupant's arrangement is detected by the non-contact sensor provided in the vicinity of the vehicle seat. be able to.

  In the wireless communication apparatus of the present invention, the transmission / reception means includes reception power measurement means for measuring reception power, and the antenna selection means selects an antenna based on an occupant arrangement detected by the detection means. Later, when the received power measured by the transmitting / receiving means is less than a predetermined value, an antenna other than the selected antenna is selected from the first antenna.

  With this configuration, when the received power at the antenna selected with reference to the table is less than the set value, switching to another antenna causes the communication status with the portable wireless communication device to be temporarily due to some factor other than occupant placement. Even when it deteriorates, a good communication state can be maintained.

  The wireless communication apparatus of the present invention includes a second antenna having directivity to the outside of the vehicle, and the antenna switching means transmits one of the first antenna or the second antenna to the transmission / reception means. The antenna selecting means is configured to select the second antenna when the detecting means does not detect an occupant.

  With this configuration, when there is no occupant in the vehicle, the second antenna having directivity is switched to the outside of the vehicle. Therefore, even when the occupant goes out of the vehicle, the portable wireless communication device carried by the occupant Can communicate with.

  ADVANTAGE OF THE INVENTION According to this invention, the radio | wireless communication apparatus which can switch an antenna by simple structure can be provided.

Hereinafter, a wireless communication apparatus according to an embodiment of the present invention will be described with reference to the drawings.
(First embodiment)
FIG. 1 shows the configuration of a wireless communication apparatus according to the first embodiment of the present invention.

  The wireless communication device 50 includes a transceiver 10 that performs transmission and reception with a portable wireless communication device (not shown) such as a mobile phone, an A antenna 1 and a B antenna 2 that are installed in the vehicle and have directivity inside the vehicle, Corresponds to the combination of the antenna switching unit 3 that connects either the antenna 1 or the B antenna 2 to the transceiver 10, the occupant sensors 5 to 9 that detect the occupant arrangement in the vehicle, and the occupant arrangement and the antenna to be used. The control unit 4 stores the attached antenna selection table 4a and selects an antenna to be connected to the antenna switching unit 3 based on the occupant arrangement detected by the occupant sensors 5 to 9 with reference to the antenna selection table 4a. ing. The control unit 4 includes a ROM (Read Only Memory) that stores the antenna selection table 4a, a processor that performs calculation, and the like. In addition, the occupant sensors 5 to 9 are constituted by sensors provided in each seat of the vehicle or in the vicinity of each seat.

  FIG. 2 shows an antenna selection table 4a stored in the control unit 4. The antenna selection table 4a associates the layout of passengers in the vehicle with the antenna to be used. The antenna selection table 4a is not shown and is carried by an occupant seated in any one of a vehicle having two seats in the front and three seats in the rear and seated in the front right seat. When communicating with a wireless communication apparatus, a determination is made based on the received power distribution in the vehicle shown in FIG. 3 in advance to determine whether the A antenna 1 or the B antenna 2 can be used for better communication. It is. For example, it is determined that the A antenna 1 is used when the occupant is disposed only in the front right seat, and the B antenna 2 is used when the occupant is disposed in the front right seat and the front left seat. Similarly, antennas to be used for all combinations of occupant arrangements are defined. In this embodiment, passengers and passengers are all referred to as passengers without distinction.

  3 to 6 show examples of distribution diagrams of occupant arrangement and actually measured received power, which are the basis for determining the antenna selection table 4a. The A antenna 1 is installed in the vicinity of the left side surface of the rear seat in the vehicle, and the B antenna 2 is installed in the right rear portion of the rear seat in the vehicle.

  In the case of the riding pattern 1 in which passengers are arranged in the front right seat and the rear right seat shown in FIG. 3, actual measurement of received power distributions of the A antenna 1 and the B antenna 2 for the portable wireless communication device carried by the passenger sitting in the front right seat The values are shown by broken lines and solid lines in FIGS. 4A and 4B, respectively. Here, FIG. 4A shows the received power, and FIG. 4B shows the cumulative probability of the received power. Cumulative establishment is the probability of being below the received power on the horizontal axis of the graph in a specific interval. If the sensitivity of the transceiver 10 is −70 dBm, in the riding pattern 1, the probability that the reception power of the A antenna 1 is −70 dBm is about 10%. Further, the probability that the reception power of the B antenna 2 is −70 dBm is 2%. That is, it is possible to obtain a better reception state using the B antenna 2. Therefore, it is determined in the antenna selection table 4a shown in FIG.

  Similarly, in the case of the riding pattern 2 in which passengers are arranged in the front right seat and the rear left seat shown in FIG. 5, the measured values of the received power distribution of the A antenna 1 and the B antenna 2 are shown in FIGS. 6 (a) and 6 (b). As indicated by a broken line and a solid line, respectively. In the boarding pattern 2, the probability that the reception power of the A antenna 1 is −70 dBm is about 0%. Further, the probability that the reception power of the B antenna 2 is −70 dBm is 5%. That is, it is possible to obtain a good reception state in which the A antenna 1 is used. Accordingly, the antenna selection table 4a shown in FIG. 2 defines that the A antenna 1 is used in the boarding pattern 2.

  The operation of the wireless communication apparatus 50 configured as described above will be described with reference to FIG.

  First, a boarding pattern is detected (step S11). Here, the occupant sensors 5 to 9 output the detected occupant arrangement to the control unit 4.

  Next, the control unit 4 selects an antenna corresponding to the occupant arrangement received from the occupant sensors 5 to 9 with reference to the antenna selection table 4a, and outputs a control signal to the antenna switching unit 3 to output the A antenna 1 or B. The antenna 2 is switched to the selected antenna (step S12).

  As described above, according to the wireless communication device of the first embodiment of the present invention, the occupant detected by the occupant sensors 5 to 9 with reference to the antenna selection table 4a that associates the layout of the occupant with the combination of antennas to be used. Since the antenna is switched based on the arrangement of the antennas, the antenna can be switched with a simple configuration.

  In this embodiment, two antennas, A antenna 1 and B antenna 2, are used, but the number of antennas is not limited to two. For example, when five antennas are used, the received power is measured as shown in FIGS. 4 and 6 for each boarding pattern with respect to the five antennas, and the results are shown in FIG. An appropriate antenna selection table may be determined. In this embodiment, the number of seats of the vehicle is 5. However, even if the number of seats is 10, antenna switching can be performed with a simple configuration by determining the antenna selection table from the measured value of received power in the same manner as described above. There is an effect that can be done.

  In addition, although one antenna to be connected to the transceiver 10 is selected, a combination of a plurality of antennas may be selected and connected to the transceiver 10.

Further, the wireless communication device 50 according to the present embodiment is not limited to a device configured as a device having a function of wireless communication alone. For example, the configuration of the wireless communication device 50 may be incorporated in the configuration of the car navigation device or the car audio device. Or you may make it incorporate the structure of a car navigation apparatus or a car audio apparatus in the radio | wireless communication apparatus 50. FIG.
(Second Embodiment)
FIG. 8 shows the configuration of the wireless communication apparatus according to the second embodiment of the present invention. In addition, the same code | symbol is attached | subjected to the component similar to the radio | wireless communication apparatus 50 of 1st Embodiment, and detailed description is abbreviate | omitted.

  The wireless communication device 60 includes a transceiver 10 that performs transmission and reception with a portable wireless communication device (not shown) such as a mobile phone, an A antenna 1 and a B antenna 2 that are installed in the vehicle and have directivity inside the vehicle, An antenna switching unit 3 that connects either the antenna 1 or the B antenna 2 to the transceiver 10, and weight sensors 11 to 15 that are provided in each seat of the vehicle and detect the position of the occupant by measuring the weight on the seat; The vehicle side control unit 16 that outputs the occupant arrangement input from the weight sensors 11 to 15 to the control unit 4 and the antenna selection table 4a that associates the combination of the occupant arrangement and the antenna to be used are stored. A control unit that selects an antenna to be connected to the antenna switching unit 3 based on the occupant arrangement input from the vehicle-side control unit 16 with reference to the antenna selection table 4a It is equipped with a door. The weight sensors 11 to 15 and the vehicle-side control unit 16 may be configured outside the wireless communication device 60. That is, a weight sensor and a vehicle-side control unit included in a so-called smart airbag system provided on the vehicle side may be used as the weight sensors 11 to 15 and the vehicle-side control unit 16 of the present embodiment.

  The operation of the wireless communication apparatus 60 configured as described above will be described with reference to FIG.

  First, a boarding pattern is detected (step S21). Here, the weight sensors 11 to 15 output the detected occupant arrangement to the vehicle-side control unit 16, and the vehicle-side control unit 16 outputs the input occupant arrangement to the control unit 4.

  Next, the control unit 4 selects an antenna corresponding to the occupant arrangement received from the vehicle-side control unit 16 with reference to the antenna selection table 4a, and outputs a control signal to the antenna switching unit 3 to output the A antenna 1 or B The antenna 2 is switched to the selected antenna (step S22).

As described above, according to the wireless communication apparatus of the second embodiment of the present invention, the occupants detected by the weight sensors 11 to 15 are referred to the antenna selection table 4a that associates the occupant arrangement with the combination of antennas to be used. Since the antenna is switched based on the arrangement of the antennas, the antenna can be switched with a simple configuration. Moreover, since the weight sensor and vehicle side control part which the smart airbag system etc. with which the vehicle side is equipped can be combined with the weight sensors 11-15 and the vehicle side control part 16 of the radio | wireless communication apparatus 60 of this Embodiment, more The antenna can be switched with a simpler configuration.
(Third embodiment)
FIG. 10 shows the configuration of the wireless communication apparatus according to the second embodiment of the present invention. In addition, the same code | symbol is attached | subjected to the component similar to the radio | wireless communication apparatus 50 of 1st Embodiment, and detailed description is abbreviate | omitted.

  The wireless communication device 70 includes a transceiver 10 that performs transmission and reception with a portable wireless communication device (not shown) such as a mobile phone, an A antenna 1 and a B antenna 2 that are installed in the vehicle and have directivity inside the vehicle, A combination of the antenna switching unit 3 for connecting either the antenna 1 or the B antenna 2 to the transceiver 10, the non-contact sensors 21 to 25 for detecting the occupant arrangement in the vehicle, and the arrangement of the occupant and the antenna to be used. A control unit 4 that stores an associated antenna selection table 4a and selects an antenna to be connected by the antenna switching unit 3 based on the occupant arrangement detected by the non-contact sensors 21 to 25 with reference to the antenna selection table 4a; It has. Here, the non-contact sensors 21 to 25 are provided, for example, on a ceiling portion in the vicinity of each seat of the vehicle, and detect infrared rays emitted from the occupant to detect the occupant arrangement.

  The operation of the wireless communication apparatus 70 configured as described above will be described with reference to FIG.

  First, a boarding pattern is detected (step S31). Here, the non-contact sensors 21 to 25 output the detected occupant arrangement to the control unit 4.

  Next, the control unit 4 selects an antenna corresponding to the occupant arrangement received from the non-contact sensors 21 to 25 with reference to the antenna selection table 4a, and outputs a control signal to the antenna switching unit 3 to output the A antenna 1 or Switch to the selected antenna among the B antennas 2 (step S32).

As described above, according to the wireless communication device of the third embodiment of the present invention, the non-contact sensors 21 to 25 detect the antenna selection table 4a that associates the layout of the occupant with the combination of antennas to be used. Since the antenna is switched based on the layout of the occupant, the antenna can be switched with a simple configuration. In addition, even when the vehicle seat is not equipped with a weight sensor, or when it is difficult to install a weight sensor on the seat, the occupant positions are detected by the non-contact sensors 21 to 25 provided in the vicinity of the vehicle seat. can do.
(Fourth embodiment)
FIG. 12 shows the configuration of a wireless communication apparatus according to the fourth embodiment of the present invention. In addition, the same code | symbol is attached | subjected to the component similar to the radio | wireless communication apparatus 50 of 1st Embodiment, and detailed description is abbreviate | omitted.

  The wireless communication device 80 includes a transceiver 30 that performs transmission and reception with a portable wireless communication device (not shown) such as a mobile phone, an A antenna 1 and a B antenna 2 that are installed in the vehicle and have directivity inside the vehicle, The antenna switching unit 3 that connects either the antenna 1 or the B antenna 2 to the transceiver 30, the occupant sensors 5 to 9 that detect the occupant arrangement in the vehicle, and the combination of the occupant arrangement and the antenna to be used are associated with each other. A control unit 4 that stores an antenna selection table 4a and selects an antenna to be connected to the antenna switching unit 3 based on the occupant arrangement detected by the occupant sensors 5 to 9 with reference to the antenna selection table 4a. Yes. The transceiver 30 includes a received power measuring unit 30 a that measures received power, calculates an average value per unit time, and outputs the average value to the control unit 4. The unit time when the reception power measuring unit 30a calculates the average value of the reception power is preferably set to be slightly shorter than the time that causes inconvenience in a call or the like when the wireless communication is interrupted.

  The operation of the wireless communication apparatus 80 configured as described above will be described with reference to FIG.

  First, a boarding pattern is detected (step S41). Here, the occupant sensors 5 to 9 output the detected occupant arrangement to the control unit 4.

  Next, the control unit 4 refers to the antenna selection table 4a, selects an antenna corresponding to the occupant arrangement received from the occupant sensors 5 to 9, outputs a control signal to the antenna switching unit 3, and outputs the A antenna 1 or B. The antenna 2 is switched to the selected antenna (step S42).

  Next, the control unit 4 determines whether or not the average value of the received power calculated by the received power measuring unit 30a of the transceiver 30 is equal to or greater than a predetermined set value (step S43). Here, the predetermined set value is, for example, the reception sensitivity of the transceiver 30.

  If the determination in step S43 is “NO”, the control unit 4 controls the antenna switching unit 3 to switch to the antenna not selected in step S42 (step S44).

  Next, the control unit 4 determines whether or not the average value of the reception power calculated by the reception power measurement unit 30a of the transceiver 30 is equal to or greater than a predetermined set value in the antenna switched in step S44 (step S44). S45). Here again, the predetermined set value is, for example, the reception sensitivity of the transmitter / receiver 30 as with the set value in step S43. If the determination in step S45 is "NO", the antenna is switched again to the antenna selected in step S42 with reference to the antenna selection table 4a (step S46). That is, when the antenna selected with reference to the antenna selection table 4a in step S42 is the A antenna 1, the average value of the received power at the A antenna 1 is less than a predetermined value, and the other antenna is selected. Switch to B antenna 2 (step S44). In addition, even if the B antenna 2 is used, if the average value of the received power is less than a predetermined value, it may be caused by a temporary communication state abnormality. The antenna is returned to the A antenna 1.

  Next, the control unit 4 determines the arrangement of the occupants input from the occupant sensors 5 to 9 when the average value of the received power is determined to be greater than or equal to the set value in step S43 and step S45 and after the antenna is switched in step S46. Is monitored to determine whether or not there is a change in the boarding pattern, that is, the occupant arrangement (step S47). Step S47 is continued until the determination becomes “YES”, that is, until there is a change in the boarding pattern. If there is a change in the boarding pattern, the processes after step S41 are performed again.

  As described above, according to the wireless communication apparatus of the fourth embodiment of the present invention, the occupant detected by the occupant sensors 5 to 9 with reference to the antenna selection table 4a that associates the layout of the occupant with the combination of antennas to be used. Since the antenna is switched based on the arrangement of the antennas, the antenna can be switched with a simple configuration. Also, when the received power at the antenna selected with reference to the antenna selection table 4a is less than the set value, the communication status with the portable wireless communication device is temporarily changed due to some factor other than the occupant arrangement by switching to another antenna. Even if the situation deteriorates, a good communication state can be maintained.

In order to simplify the explanation, two antennas have been described. However, as the number of antennas is three or more, the antennas are switched to each antenna in order until the average value of received power becomes a predetermined value or more. Also good.
(Fifth embodiment)
FIG. 14 shows the configuration of a wireless communication apparatus according to the fifth embodiment of the present invention. In addition, the same code | symbol is attached | subjected to the component similar to the radio | wireless communication apparatus 50 of 1st Embodiment, and detailed description is abbreviate | omitted.

  The wireless communication device 90 includes a transceiver 10 that performs transmission and reception with a portable wireless communication device (not shown), an A antenna 1 and a B antenna 2 that are installed in the vehicle and have directivity inside the vehicle, and a vehicle that is installed in the vehicle. A C antenna 31 having directivity to the outside, an antenna switching unit 32 for connecting any one of the A antenna 1, the B antenna 2 and the C antenna 31 to the transceiver 10, and an occupant sensor for detecting the arrangement of the occupants in the vehicle 5-9 and an antenna selection table 4b in which combinations of the occupant arrangement and the antennas to be used are associated are stored, and the occupant sensors 5-9 detect the occupant arrangement detected by referring to the antenna selection table 4b. The antenna switching unit 32 includes a control unit 4 that selects an antenna to be connected. The control unit 4 includes a ROM (Read Only Memory) that stores the antenna selection table 4b, a processor that performs calculation, and the like.

  FIG. 15 shows an antenna selection table 4b stored in the control unit 4. As shown in the figure, the antenna selection table 4b selects the C antenna 31 having directivity to the outside of the vehicle in the antenna selection table 4a described in the first embodiment when there is no occupant in the vehicle. It is determined in Specifically, the antenna used is the C antenna 31 when no occupant is present in any of the front right seat, front left seat, rear right seat, rear center seat, and rear left seat. Further, the antenna used when a passenger is present in the vehicle is the same as that of the antenna selection table 4a described in the first embodiment.

  The operation of the wireless communication apparatus 90 configured as described above will be described with reference to FIG.

  First, a boarding pattern is detected (step S51). Here, the occupant sensors 5 to 9 output the detected occupant arrangement to the control unit 4.

  Next, the control unit 4 selects an antenna corresponding to the occupant arrangement received from the occupant sensors 5 to 9 with reference to the antenna selection table 4b, and outputs a control signal to the antenna switching unit 32 to output the A antennas 1 and B. The selected antenna is switched to the antenna 2 or the C antenna 31 (step S52).

  As described above, according to the wireless communication device of the fifth embodiment of the present invention, the occupant sensors 5 to 9 detect the antenna selection table 4b that associates the occupant layout with the combination of antennas to be used. Since the antenna is switched based on the layout of the occupant, the antenna can be switched with a simple configuration. In addition, when there is no occupant in the vehicle, the C antenna 31 having directivity is switched to the outside of the vehicle, so even when the occupant goes out of the vehicle, communication with the portable wireless communication device carried by the occupant is possible. It can be carried out.

  As described above, the present invention has an effect that the antenna can be switched with a simple configuration, and is useful as a wireless communication device that communicates with a portable wireless communication device inside or near the vehicle.

The block diagram which shows the structure of the radio | wireless communication apparatus which concerns on the 1st Embodiment of this invention The figure which shows the structure of the antenna selection table of the radio | wireless communication apparatus which concerns on 1st Embodiment. The figure which shows an example of passenger | crew arrangement | positioning of the radio | wireless communication apparatus which concerns on 1st Embodiment The figure which shows the received power in the passenger | crew arrangement | positioning of FIG. The figure which shows the other example of passenger | crew arrangement | positioning of the radio | wireless communication apparatus which concerns on 1st Embodiment. The figure which shows the received power in the passenger | crew arrangement | positioning of FIG. The flowchart explaining operation | movement of the radio | wireless communication apparatus which concerns on the 1st Embodiment of this invention. The block diagram which shows the structure of the radio | wireless communication apparatus which concerns on the 2nd Embodiment of this invention. FIG. 4 is a flowchart for explaining the operation of the wireless communication apparatus according to the second embodiment of the present invention. The block diagram which shows the structure of the radio | wireless communication apparatus which concerns on the 3rd Embodiment of this invention. FIG. 4 is a flowchart for explaining the operation of the wireless communication apparatus according to the third embodiment of the present invention. The block diagram which shows the structure of the radio | wireless communication apparatus which concerns on the 4th Embodiment of this invention. The flowchart explaining operation | movement of the radio | wireless communication apparatus which concerns on the 4th Embodiment of this invention. The block diagram which shows the structure of the radio | wireless communication apparatus which concerns on the 5th Embodiment of this invention. The figure which shows the structure of the antenna selection table of the radio | wireless communication apparatus which concerns on 5th Embodiment. The flowchart explaining operation | movement of the radio | wireless communication apparatus which concerns on the 5th Embodiment of this invention.

Explanation of symbols

1 A antenna (first antenna)
2 B antenna (first antenna)
3, 32 Antenna switching unit (antenna switching means)
4 Control unit (storage means, antenna selection means)
4a, 4b Antenna selection table 5, 6, 7, 8, 9 Crew sensor (detection means)
10, 30 Transceiver (transmission / reception means)
11, 12, 13, 14, 15 Weight sensor (detection means)
16 Vehicle side control part (detection means)
21, 22, 23, 24, 25 Non-contact sensor (detection means)
30a Received power measuring unit (received power measuring means)
31 C antenna (second antenna)
50, 60, 70, 80, 90 Wireless communication apparatus

Claims (5)

Transmitting / receiving means for transmitting / receiving to / from the portable wireless communication device;
A plurality of first antennas having directivity to the inside of the vehicle;
Antenna switching means for connecting any of the first antennas to the transmitting / receiving means;
Detection means for detecting the arrangement of passengers in the vehicle;
Storage means for storing a table in which a combination of an occupant arrangement and an antenna to be used is associated;
A wireless communication apparatus comprising: an antenna selection unit that refers to a table stored in the storage unit and selects an antenna to be connected to the antenna switching unit based on an occupant arrangement detected by the detection unit . The said detection means has a weight sensor provided in the seat of the said vehicle, This weight sensor detects a passenger | crew's arrangement | positioning by measuring the weight on the said seat. Wireless communication device. The said detection means has a non-contact sensor provided in the seat vicinity of the said vehicle, and detects the object on the said seat, The arrangement | positioning of a passenger | crew is detected by this non-contact sensor. Wireless communication device. The transmission / reception means includes reception power measurement means for measuring reception power,
The antenna selection unit selects an antenna other than the selected antenna when the reception power measured by the transmission / reception unit is less than a predetermined value after selecting the antenna based on the occupant arrangement detected by the detection unit. The wireless communication apparatus according to claim 1, wherein the wireless communication apparatus is selected from the first antenna. A second antenna having directivity to the outside of the vehicle;
The antenna switching means connects one of the first antenna or the second antenna to the transmission / reception means,
5. The wireless communication apparatus according to claim 1, wherein the antenna selection unit selects the second antenna when the detection unit does not detect an occupant. 6.

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