JP2011082876A - Wireless communication apparatus, wireless communication system, installation supporting method, and integrated circuit - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide: a wireless communication apparatus capable of performing stable millimeter wave radio transmission; a wireless communication system; and an installation supporting method. <P>SOLUTION: As one example of a wireless communication apparatus, a sync device 20 includes: an array antenna 28 capable of changing directivity; a content receiving part 61 for receiving data via the array antenna 28; a measuring part 64 for measuring communication quality of data received by the content receiving part 61 for each combination of directivity of both antennas while changing directivity of array antennas 6 and 28 of a source device 1 and the sync device 20, respectively; and a notification part 65 in which, when a plurality of such combinations of directivity that the communication quality measured by the measuring part 64 exceeds a predetermined threshold are present, a user is notified of current installation locations of the source device 1 and the sync device 20 as recommended locations. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

  The present invention relates to a wireless transmission method for uncompressed video data, and more particularly to an installation support method for supporting the installation positions of a transmitter and a receiver.

  Wireless HD, which is a standard for wirelessly transmitting uncompressed baseband video signals and digital audio signals between AV devices, has been formulated. Wireless HD (High-Definition) is a technical specification for viewing HD video data stored in a digital video recorder, an STB (Set-Top Box), a personal computer, or the like on a high-definition television or the like without a cable connection.

  In addition, since a bidirectional control signal is also included, a protocol is defined that allows a television and a digital video recorder to be linked together and that a home theater and the like can be controlled in a unified manner. In addition, since wireless HD can transmit high-quality content, DTCP (Digital Transmission Content Protection) is defined as a content protection method so that provided content is not illegally reproduced or illegally copied. Has been.

  FIG. 9 shows a wireless HD network configuration. The operation of the wireless HD network system will be described below with reference to the drawings. As shown in FIG. 9, the wireless network system includes a transmitter device 140 and a receiver device 141 that are wirelessly connected.

  Transmitter device 140 includes a processor 103, a baseband processing component 104, a phased array antenna 105, and a wireless communication channel interface 106. The transmitter device 140 transmits the content acquired via the media receiver 100 and the media receiver interface 102 to the receiver device 141.

  On the other hand, the receiver device 141 includes a wireless communication channel interface 109, a phased array antenna 110, a baseband processing component 111, and a processor 112. The receiver device 141 displays the content acquired from the transmitter device 140 on the display 115 via the media player interface 113 and the media player 114.

  The operation of the wireless transmission method in the wireless HD network system configured as described above will be described below. First, the media receiver 100 receives content from a source (not shown) and transmits the content to the transmitter device 140 via the media receiver interface 102.

  The processor 103 of the transmitter device 140 generates a baseband signal that is processed by the baseband processing component 104. Baseband processing component 104 generates a digitally modulated signal (eg, an OFDM signal). Phase array antenna 105 includes a radio frequency (millimeter wave RF) transmitter connected to processor 103 and having a digitally controlled phased array antenna to be controlled. The content is then transmitted to the receiver device 141 using adaptive beamforming.

  The receiver device 141 transmits the content received from the transmitter device 140 to the media player 114 via the media player interface 113. The content transmitted to the media player 114 is played on the display 115. The phase array antenna 110 of the receiver device 141 includes a radio frequency (millimeter wave RF) transmitter that is connected to the processor 112 and has a digitally controlled phase array antenna that is controlled. The content is then received from transmitter device 140 using adaptive beamforming. The baseband processing component 111 demodulates the received digital modulation signal, and the processor 112 generates a baseband signal.

  The wireless communication channel interfaces 106 and 109 are connected to the processors 103 and 112, respectively, and provide an interface between the processor 103 and the processor 112. Specifically, antenna information regarding the use of the phase array antenna 105 and the phase array antenna 110 is transmitted, and information that facilitates content reproduction at another location (position) is transmitted.

  Next, adaptive beamforming between the transmitter device 140 and the receiver device 141 will be described. Transmitter device 140 and receiver device 141 perform wireless communication using phased array antennas 105, 110 with adaptive beamforming that is beam steerable. In beamforming, the processor 103 sends a digital control signal to the phased array antenna 105, indicates the amount to shift one or more phase shifters in the phased array antenna 105, and manipulates the beam formed thereby. . Similarly, the processor 112 controls the phased array antenna 110 using digital control information. Digital control information is transmitted and received using the wireless communication channel interfaces 106 and 109 (referred to as “control channels”) of the transmitter device 140 and the receiver device 141.

  The transmitter device 140 transmits information wirelessly to the receiver device 141 using two wireless connections. One of the wireless connections is by phased array antennas 105, 110 with adaptive beamforming. Other wireless connections are via the control channel (referred to here as the back channel). The back channel carries antenna information between the transmitter device 140 and the receiver device 141.

  During initialization of the phased array antennas 105, 110, information is transmitted from the back channel that allows the processor 103 to select the direction of the phased array antenna 105. When the phased array antennas 105, 110 are operating in the mode in which they are transmitting content, the back channel transmits an indication of the communication path status from the processor 112 of the receiver device 141. This communication status instruction includes an instruction from the processor 112 that prompts the processor 103 to direct the beam in the other direction.

  Using such a wireless content transmission method, uncompressed AV data can be transmitted from the transmitter device 140 to the receiver device 141 in real time. For example, Patent Literature 1 and Non-Patent Literature 1 describe wireless HD wireless transmission methods.

Special table 2009-505507

WirelessHD Specification Version 1.0 Overview, October 9, 2007

  However, in the wireless transmission method using adaptive beamforming described above, the millimeter wave can be used even when the installation positions of the transmitter device 140 and the receiver device 141 are in a non-line-of-sight (NLOS) environment or in a line-of-sight (LOS) environment. When a person crosses a wireless communication path, data transmission in the wireless section may become unstable. As a result, a transmission error of content transmitted from the transmitter device 140 to the receiver device 141 occurs, and there is a problem that video and audio reproduced on the display 115 are disturbed.

  In view of the above problems, the present invention provides a wireless communication apparatus, a wireless communication system, and a wireless communication apparatus installation support method capable of stable millimeter-wave wireless transmission in a wireless transmission method using adaptive beamforming. For the purpose.

  A wireless communication apparatus according to an aspect of the present invention receives data wirelessly transmitted by a partner apparatus that can change the directivity of an antenna. Specifically, the antennas that can change the directivity, the receiving unit that receives the data through the antennas, the antennas of the wireless communication device and the counterpart device, respectively, while changing the directivity of both antennas. When there are a plurality of combinations of directivities in which the communication quality measured by the measurement unit exceeds the predetermined threshold and the measurement unit that measures the communication quality of the data received by the reception unit for each combination of sex And a notifying unit for notifying a user of a current installation position of the wireless communication apparatus and the counterpart apparatus as a recommended position. According to the above configuration, since it is possible to know whether or not the current arrangement is appropriate, it is possible to change the installation position according to the notification result.

  Further, the wireless communication device includes a directivity control unit that changes the directivity of the antenna, and a transmission unit that transmits a directivity change instruction for changing the directivity of the antenna of the counterpart device to the counterpart device through the antenna. With. Then, the measurement unit causes the directivity control unit to sequentially change the directivity of the antenna, and when the communication quality is measured with all the directivities of the antenna, the directivity change instruction is sent to the transmission unit. It may be transmitted.

  Further, the transmission unit transmits a transmission rate change instruction for changing the transmission rate of the data from the first transmission rate to a second transmission rate smaller than the first transmission rate to the counterpart device through the antenna. . Then, as a result of measuring the communication quality of the data transmitted at the first transmission rate, when the measurement unit does not have a plurality of combinations of directivities in which the communication quality exceeds the threshold, the transmission unit The transmission rate change instruction may be transmitted to a unit, and the communication quality of the data transmitted at the second transmission rate may be measured. By measuring the communication quality for each transmission rate, it is possible to know in more detail whether the current arrangement is appropriate.

  Further, the directivity control unit changes the directivity of the antenna at a first interval when the data is transmitted at the first transmission rate. Then, when the data is transmitted at the second transmission rate, the directivity of the antenna may be changed at a second interval wider than the first interval. Generally, communication quality improves as the transmission rate decreases. Therefore, when the transmission rate is lowered, the above processing is speeded up by setting a large directivity change pitch.

  For example, the transmission unit may communicate with the partner apparatus using an LRP (Low-Rate Physical Layer) method. On the other hand, the receiving unit may communicate with the counterpart device using an HRP (High-Rate Physical Layer) method. By adopting the LRP method in the transmission unit, various control data can be stably transmitted and received. On the other hand, by adopting the HRP method for the receiving unit, large-capacity data can be transferred at high speed.

  The measurement unit may measure at least one of a received signal strength and a signal-to-noise ratio at the antenna.

  A wireless communication apparatus according to another aspect of the present invention wirelessly transmits data to a partner apparatus that can change the directivity of an antenna. Specifically, an antenna whose directivity can be changed, a transmission / reception unit that transmits the data through the antenna and receives a reception confirmation indicating that the data has been received from the counterpart device, and the wireless communication device And a measurement unit that measures a data error rate based on the reception confirmation received by the transmission / reception unit for each combination of the directivity of both antennas while changing the directivity of the antenna of the counterpart device, and the measurement When there are a plurality of combinations of directivities in which the data error rate measured by the unit exceeds a predetermined threshold, a notification unit that notifies the user of the current installation position of the wireless communication device and the counterpart device as a recommended position With. Also with the above configuration, it is possible to know whether or not the current arrangement is appropriate.

  The wireless communication apparatus further includes a transmission rate control unit that changes a transmission rate of the data. The measurement unit measures a data error rate when the data is transmitted at the first transmission rate, and when there are not a plurality of directivity combinations in which the data error rate exceeds the threshold, The transmission rate control unit may change the data transmission rate to a second transmission rate smaller than the first transmission rate. By measuring the communication quality for each transmission rate, it is possible to know in more detail whether the current arrangement is appropriate.

  The data rate of the data is set smaller than the first transmission rate and larger than the second transmission rate. The transmitting unit may compress the data when transmitting the data at the second transmission rate. At the first transmission rate, data can be transmitted without being compressed. On the other hand, at the second transmission rate, data compression is required, but higher communication quality than the first transmission rate can be expected.

  A wireless communication system according to an aspect of the present invention includes a first wireless communication device and a second wireless communication device that receives data wirelessly transmitted from the first wireless communication device. The first wireless communication apparatus includes a first antenna whose directivity can be changed, and a transmission unit that transmits the data through the first antenna. The second wireless communication apparatus changes a directivity of a second antenna, a receiving unit that receives the data through the second antenna, and a directivity of the first and second antennas, respectively. However, a measurement unit that measures the communication quality of the data received by the reception unit for each combination of directivity of both antennas, and a directivity that the communication quality measured by the measurement unit exceeds a predetermined threshold And a notification unit that notifies the user of the current installation positions of the first and second wireless communication devices as recommended positions when there are a plurality of combinations.

  An installation support method according to an aspect of the present invention provides a user with a preferable installation position between a first wireless communication device and a second wireless communication device that receives data wirelessly transmitted from the first wireless communication device. This is a method for informing. Each of the first and second wireless communication devices includes an antenna whose directivity can be changed. Then, the installation support method is received by the second wireless communication device for each combination of the directivity of both antennas while changing the directivity of the antennas of the first and second wireless communication devices. The measurement step of measuring the communication quality of the data, and when there are a plurality of combinations of directivities in which the communication quality measured in the measurement step exceeds a predetermined threshold, the first and second wireless communication devices A notification step of notifying the user of the current installation position as a recommended position.

  An integrated circuit according to one embodiment of the present invention receives data wirelessly transmitted by a partner apparatus that can change the directivity of an antenna using an antenna that can change the directivity. Specifically, the receiving unit that receives the data through the antenna, the antenna connected to the integrated circuit, and the antenna directivity of the counterpart device are changed for each combination of antenna directivities. The current installation position when there are a plurality of combinations of directivity in which the communication quality measured by the measurement unit and the measurement unit that measures the communication quality of the data received by the reception unit exceed a predetermined threshold Is provided as a recommended position to the user.

  An integrated circuit according to another aspect of the present invention wirelessly transmits data to a partner device that can change the directivity of the antenna using an antenna that can change the directivity. Specifically, a transmitting unit that transmits the data through the antenna, a receiving unit that receives a reception confirmation indicating that the data has been received from the counterpart device, an antenna connected to the integrated circuit, and the counterpart A measurement unit that measures a data error rate based on the reception confirmation received by the reception unit for each combination of directivity of both antennas while changing the directivity of the antenna of the device, and a measurement by the measurement unit And a notification unit that notifies the user of the current installation position as a recommended position when there are a plurality of combinations of directivities in which the data error rate exceeds a predetermined threshold.

  According to the present invention, it is possible to know in advance whether or not the installation positions of the source device and the sink device are appropriate. Therefore, when the installation positions of the source device and the sink device are in a non-line-of-sight (NLOS) environment, ) Even in the environment, even when a person crosses a millimeter-wave wireless communication path, there are two or more communication paths that can be communicated, so transmission errors do not occur and the video and audio reproduced on the display are not disturbed. Can be.

1 is a schematic diagram of a wireless communication system according to an embodiment of the present invention. 1 is a hardware configuration diagram of a wireless communication apparatus according to an embodiment of the present invention. It is a functional block diagram of the radio | wireless communication apparatus which concerns on one form of this invention. It is a figure which shows the direction of the radio beam radiated | emitted / incident from an array antenna. 4 is a flowchart showing an installation support method according to the first embodiment. 6 is a flowchart showing an installation support method according to the second embodiment. 10 is a flowchart illustrating an installation support method according to the third embodiment. 10 is a flowchart illustrating an installation support method according to the fourth embodiment. It is a network block diagram of the conventional wireless HD.

  With reference to FIGS. 1-3, the radio | wireless communications system which concerns on one Embodiment, and the radio | wireless communication apparatus which comprises a radio | wireless communications system are demonstrated. FIG. 1 is a schematic diagram of a wireless communication system. FIG. 2 is a hardware configuration diagram of the wireless communication apparatus. FIG. 3 is a functional block diagram of the wireless communication apparatus.

  As shown in FIG. 1, the wireless communication system according to the present embodiment includes a source device 1 and a sink device 20 as wireless communication devices. The source device 1 and the sink device 20 are compliant with wireless HD.

  The source device 1 is a video playback device that acquires and plays back content from a recording medium such as a BD (Blu-ray Disc). However, the recording medium for recording the content is not limited to the BD, and any recording medium such as a DVD (Digital Versatile Disc), an HDD (Hard Disk Drive), and a non-volatile memory can be adopted.

  On the other hand, the sink device 20 is typically a video display device such as a television. Although the specific structure of a display is not specifically limited, For example, a CRT (Cathode Ray Tube) display, a liquid crystal display, a plasma display, an organic EL (Electro Luminescence) display, etc. are employable.

  In the wireless communication system configured as described above, the sink device 20 receives and displays the content data wirelessly transmitted by the source device 1. At this time, wireless communication is performed between the source device 1 and the sink device 20 using a highly directional millimeter wave (referred to as “wireless beam”).

  Referring to FIG. 2, a source device 1 that functions as a source device for AV content data includes a video / audio reproduction device 2, a packet processing circuit 3, a packet radio transmission / reception circuit 4, a memory 5, an array antenna 6, And a controller 11.

  The video / audio reproduction device 2 is, for example, a BD (Blu-ray Disc) player, reproduces video data and audio data from a recording medium such as a disc, and outputs the data to the packet processing circuit 3. The packet processing circuit 3 converts the input video data and audio data into a digital signal in a predetermined packet format and outputs the digital signal to the packet wireless transmission / reception circuit 4. The packet radio transmission / reception circuit 4 digitally modulates a radio signal (carrier wave signal) in accordance with the input digital signal. Then, the modulated wireless signal is wirelessly transmitted to the sink device 20 via the array antenna 6.

  On the other hand, a wireless signal wirelessly transmitted from the sink device 20 is received by the packet wireless transmission / reception circuit 4 via the array antenna 6. The packet radio transmission / reception circuit 4 demodulates the received radio signal into a baseband signal, and then outputs the demodulated signal to the packet processing circuit 3. The packet processing circuit 3 extracts only predetermined control data from the input baseband signal by predetermined packet separation processing, and then outputs it to the controller 11.

  The packet radio transmission / reception circuit 4 has a high-speed data reception function (HRP) that transmits data at a high transmission rate and a low-speed data transmission function (LRP) that transmits and receives data at a low transmission rate. Typically, the high-speed data transmission function is used for transmission of data that requires high-speed transmission such as uncompressed video. On the other hand, the low-speed data transmission function is used to transmit data that can be transmitted at a relatively low transmission speed, such as voice and control commands. However, this is only an example, and for example, audio and control commands may be transmitted together with uncompressed video using a high-speed data transmission function.

  The sink device 20 includes a packet radio transmission / reception circuit 22, a packet processing circuit 23, a video / audio processing circuit 24, a speaker 27, a display 26, a memory 25, an array antenna 28, and a controller 21.

  The packet radio transmission / reception circuit 22 demodulates the radio signal received via the array antenna 28 into a baseband signal, and then outputs it to the packet processing circuit 23. The packet processing circuit 23 decodes the received packet by extracting only video data, audio data, and predetermined control data from the input digital signal by predetermined packet separation processing. Then, video data and audio data are output to the video / audio processing circuit 24, and control data is output to the controller 21. The video / audio processing circuit 24 performs predetermined signal processing and D / A conversion processing on input audio data, and then outputs the audio data to the speaker 27 to output audio. The input video data is subjected to predetermined signal processing and then output to the display 26 for display.

  The packet radio transmission / reception circuit 22 has a high-speed data reception function (HRP) for receiving data at a high transmission rate and a low-speed data transmission function (LRP) for transmission / reception of data at a low transmission rate. Typically, the high-speed data transmission function is used for transmission of data that requires high-speed transmission such as uncompressed video. On the other hand, the low-speed data transmission function is used to transmit data that can be transmitted at a relatively low transmission speed, such as voice and control commands. However, this is only an example, and for example, audio and control commands may be transmitted together with uncompressed video using a high-speed data transmission function.

  Next, referring to FIG. 3, the source device 1 includes an array antenna 6 that can change directivity, a content transmission unit 51, a control data transmission / reception unit 52, a directivity control unit 53, and a transmission rate control unit. 54, a measurement unit 55, and a notification unit 56.

  The content transmission unit (transmission / reception unit) 51 transmits data to the sink device 20 through the array antenna 6. This process is mainly executed by the packet processing circuit 3, the packet radio transmission / reception circuit 4, and the controller 11 shown in FIG.

  The data here refers to content data such as a video signal and an audio signal, for example. In addition, the content transmission part 51 can also compress the said data and transmit as needed. In addition, a reception confirmation signal indicating that the data has been received is received from the sink device 20. Note that the reception confirmation signal is typically ACK (ACKnowledgement).

  The control data transmission / reception unit 52 transmits / receives control data to / from the sink device 20. This process is mainly executed by the packet processing circuit 3, the packet radio transmission / reception circuit 4, and the controller 11 shown in FIG. The control data transmission / reception unit 52 receives, for example, a directivity change instruction for changing the directivity of the array antenna 6 from the sink device 20. Alternatively, a directivity change instruction for changing the directivity of the array antenna 28 is transmitted to the sink device 20. Furthermore, a transmission rate change instruction for changing the data transmission rate is received from the sink device 20.

  The directivity control unit 53 changes the directivity of the array antenna 6. More specifically, the directivity control unit 53 selects one of a plurality of directivities preset for the array antenna 6. This process is mainly executed by the packet radio transmission / reception circuit 4 and the controller 11 shown in FIG.

  For example, FIG. 4 shows the direction of a radio beam emitted / incident from the array antenna 6. In a hemispherical space centered in the vertical direction (Z direction) with respect to the plane including the array antenna 6, radio beam radiation / incident in units of 45 degrees in the horizontal direction (X direction) and the vertical direction (Y direction), respectively. Can be set. In the example shown in FIG. 4, there are a total of 17 (arrows 41a to 41q) radio beam directions. Here, it is assumed that the directivity of the millimeter-wave radio beam is steep, and communication cannot be established simultaneously in the directions of adjacent radio beams.

  The arrows 41c, 41g, 41k, 41o, and 41q have different angles from each other in the YZ plane, as shown in FIG. 4B. Similarly, the arrows 41a, 41e, 41i, 41m, and 41q are different in angle from each other in the XZ plane, as shown in FIG. 4C. The same applies to the other arrows, and it is assumed that the plurality of arrows positioned on the same straight line in FIG. 4A have different angles when viewed on a plane including them.

  In the example of FIG. 4, the interval (pitch) for changing the directivity is not limited to 45 °. That is, the directivity control unit 53 can change the directivity at a pitch that is an integral multiple of 45 ° as a minimum unit. For example, when the data transmission rate is relatively high (first transmission rate), the directivity may be changed at a relatively small pitch (first interval). On the other hand, when the data transmission rate is low (second transmission rate), the directivity may be changed at a relatively large pitch (second interval).

  The transmission rate control unit 54 changes the data transmission rate. This process is mainly executed by the controller 11 and the packet radio transmission / reception circuit 4 shown in FIG. In the wireless HD, as a radio section rate Rw of a high-speed communication rate (HRP) signal for transmitting video data and audio data, 3 of mode 0 (about 1 Gbps), mode 1 (about 2 Gbps), and mode 2 (about 4 Gbps) are used. The type is specified. Then, the transmission rate control unit 54 has a first radio section rate Rw1 larger than the data rate Rd (Rw ≧ Rd) of video data and audio data passed between the video / audio reproduction device 2 and the packet processing circuit 3. The second radio section rate Rw2 smaller than the data rate Rd (Rw <Rd) can be switched between each other.

  The measuring unit 55 measures the communication quality with the sink device 20 for each combination of directivities of the array antennas 6 and 28. Note that the measurement unit 55 on the source device 1 side measures the data error rate based on the reception confirmation signal, for example. This process is mainly executed by the memory 5 and the controller 11 shown in FIG.

  The notification unit 56 notifies the user of the current installation positions of the source device 1 and the sink device 20 as recommended positions. The case of the recommended position is a case where there are a plurality of combinations of directivities of the array antennas 6 and 28 in which the data error rate measured by the measurement unit 55 exceeds a predetermined threshold. The specific method of notification is not particularly limited. For example, the notification may be performed using a display unit such as an LED (Light Emitting Diode) provided in the source device 1, or an audio output unit such as a speaker may be provided. May be used for notification, or the result may be transmitted to the sink device 20 and displayed on the sink device 20 side.

  The sink device 20 includes an array antenna 28 that can change directivity, a content reception unit 61, a control data transmission / reception unit 62, a directivity control unit 63, a measurement unit 64, and a notification unit 65.

  The content receiving unit 61 receives data from the source device 1 through the array antenna 28. This process is mainly executed by the controller 21, the packet radio transmission / reception circuit 22, the packet processing circuit 23, and the like shown in FIG. In addition, the content receiving unit 61 transmits ACK indicating that the data has been received to the source device 1 through the array antenna 28.

  The control data transmission / reception unit 62 transmits / receives control data to / from the source device 1. The processing of the control data transmission / reception unit 62 is mainly executed by the controller 21, the packet radio transmission / reception circuit 22, the packet processing circuit 23, and the like shown in FIG. Since specific examples of control data to be transmitted and received have already been described, a description thereof will be omitted.

  Note that the content transmission unit 51 of the source device 1 and the content reception unit 61 of the sink device 20 communicate with each other by the HRP (High-Rate Physical Layer) method. On the other hand, the control data transmission / reception unit 52 of the source device 1 and the control data transmission / reception unit 62 of the sink device 20 communicate with each other by an LRP (Low-Rate Physical Layer) method.

  The directivity control unit 63 changes the directivity of the array antenna 28. This process is mainly executed by the controller 21 and the packet radio transmission / reception circuit 22 shown in FIG. Since a specific control method has already been described, a description thereof will be omitted.

  The measurement unit 64 measures the communication quality with the source device 1 for each combination of directivities of the array antennas 6 and 28. Note that the measurement unit 64 on the sink device 20 side measures, for example, the received signal strength (RSSI) and the signal-to-noise ratio (S / N) at the array antenna 28. The measuring unit 64 controls the operation timing of the control data transmitting / receiving unit 62 and the directivity control unit 63. This process is mainly executed by the controller 21 and the memory 25 shown in FIG.

  The notification unit 65 notifies the user of the current installation positions of the source device 1 and the sink device 20 as recommended positions. The case of the recommended position is a case where there are a plurality of combinations of directivities of the array antennas 6 and 28 whose received signal strength or signal-to-noise ratio measured by the measurement unit 64 exceeds a predetermined threshold. This process is mainly executed by the controller 21, the display 26, and the speaker 27 shown in FIG.

  Next, with reference to FIG. 5 to FIG. 8, the setting of the direction of the radio beam between the array antenna 6 and the array antenna 28 for transmitting video data and audio data from the source device 1 to the sink device 20 will be described. The source device 1 and the sink device 20 are wirelessly connected at a low communication rate (LRP), and can transmit and receive control data to each other. In order to enable wireless connection at a high-speed communication rate (HRP) for transmitting video data and audio data, the source device 1 and the sink device 20 operate in a coordinated manner so that the directions of the array antenna 6 and the array antenna 28 are changed. adjust.

(Embodiment 1)
With reference to FIG. 5, the installation support method which concerns on Embodiment 1 of this invention is demonstrated. In the first embodiment, among the components of the source device 1 shown in FIG. 3, the transmission rate control unit 54, the measurement unit 55, and the notification unit 56 can be omitted.

  First, the directivity of the array antenna 6 of the source device 1 is set (S11). Specifically, the control data transmission / reception unit 62 of the sink device 20 transmits a directivity change instruction to the source device 1 through the array antenna 28. The directivity control unit 53 of the source device 1 that has received the directivity change instruction sets, for example, the direction Dtx of the radio beam of the array antenna 6 in the direction of the arrow 41a.

  Then, the content transmission unit 51 of the source device 1 transmits a data packet to the sink device 20. The timing for starting the transmission of the data packet is not particularly limited. For example, the data packet transmission may be started at the timing when the directivity of the array antenna 6 is changed based on the directivity change instruction, or the data transmission from the sink device 20 is performed separately. You may start at the instructed timing.

  Next, the directivity of the array antenna 28 of the sink device 20 is set (S12). Specifically, the directivity control unit 63 of the sink device 20 sets, for example, the direction Drx of the radio beam of the array antenna 28 in the direction of the arrow 41a.

  Next, the measuring unit 64 of the sink device 20 measures the communication quality with the source device 1 (S13). Specifically, the received signal strength or signal-to-noise ratio at the array antenna 28 is measured. Then, the measuring unit 64 stores the measurement result in the memory 25 in association with the directivity of the array antennas 6 and 28.

  Next, it is determined whether or not the communication quality measurement has been completed for all directivities of the array antenna 28 of the sink device 20 (S14). When the measurement has not yet been completed (No in S14), the measurement unit 64 of the sink device 20 repeats the processes of S12 and S13. That is, a packet is received while sequentially changing the direction Drx of the radio beam of the array antenna 28 from the arrows 41a to 41q, and the received signal strength (RSSI) or signal-to-noise ratio (with respect to the direction Drx of each radio beam of the array antenna 28) S / N) is stored in the memory 25.

  Next, when measurement of communication quality is completed for all directivities of the array antenna 28 (Yes in S14), it is determined whether or not measurement of communication quality is completed for all directivities of the array antenna 6 of the source device 1. (S15). If the measurement has not been completed yet (Yes in S15), the directivity of the array antenna 6 of the source device 1 is set to, for example, the arrow 41b (S11), and the packet is transmitted to the sink device 20. The measuring unit 64 of the sink device 20 receives the packets while sequentially changing the directivity of the array antenna 28 from the arrows 41a to 41q, and receives the received signal strength (RSSI) or signal pair with respect to the direction of each radio beam of the array antenna 28. The noise ratio (S / N) is stored in the memory 25 (S12 to S14).

  Similarly, for all combinations of the directivity of the array antenna 6 of the source device 1 (arrows 41a to 41q) and the directivity of the array antenna 28 of the sink device 20 (arrows 41a to 41q), the received signal strength ( RSSI) or signal-to-noise ratio (S / N) is measured, and the measurement result is stored in the memory 25 (S11 to S15).

  The notification unit 56 of the sink device 20 sets a predetermined threshold value among the measurement results stored in the memory 25 after the antenna direction scan of the array antenna 6 and the array antenna 28 is completed (Yes in S15). Extract more measurement results. If there are two or more extracted measurement results, the current installation positions of the source device 1 and the sink device 20 are notified to the user as recommended positions (S16).

  Specifically, the received signal strength RSSI_t or the signal-to-noise ratio S / N_t that is equal to or higher than a communicable threshold value is extracted from the memory 25. And the presence or absence of RSSI_t or S / N_t and whether there are two or more RSSI_t or S / N_t are displayed on the display 26. With this information, the user can check the communication status of the current installation position between the source device 1 and the sink device 20.

  In the installation support method shown in FIG. 5, an example is shown in which the communication quality is measured for all directivities on the sink device 20 side while the directivity on the source device 1 side is fixed. Needless to say. That is, the same result can be obtained even if the processing order of S11 and S12 in FIG. 5 is changed and the processing order of S14 and S15 is changed.

(Embodiment 2)
With reference to FIG. 6, the installation assistance method which concerns on Embodiment 2 of this invention is demonstrated. In the second embodiment, the transmission rate control unit 54 can be omitted from the components of the source device 1 shown in FIG. Similarly, the measurement part 64 and the alerting | reporting part 65 are omissible among the components of the sink device 20 shown by FIG. In addition, since many of the processes of the first and second embodiments are common, the following description will focus on differences.

  First, the directivity of the array antenna 6 of the source device 1 is set (S21). Specifically, the directivity control unit 53 of the source device 1 sets the radio beam direction Dtx of the array antenna 6 in the direction of the arrow 41a, for example. Then, the content transmission unit 51 transmits a data packet to the sink device 20.

  Next, the directivity of the array antenna 28 of the sink device 20 is set (S22). Specifically, the control data transmission / reception unit 52 of the source device 1 transmits a directivity change instruction to the sink device 20 through the array antenna 6. The directivity control unit 63 of the sink device 20 that has received the directivity change instruction sets, for example, the direction Drx of the radio beam of the array antenna 28 in the direction of the arrow 41a.

  Next, the measurement unit 55 of the source device 1 measures the communication quality with the sink device 20 (S23). Specifically, the sink device 20 transmits a reception confirmation signal indicating that the data packet has been received to the source device 1. Then, the measurement unit 55 of the source device 1 measures the presence / absence of a packet error and the packet error rate (PER) based on the reception confirmation signal received from the sink device 20, and the measurement result is directed to the array antennas 6 and 28. Stored in the memory 5 in association with each other.

  Next, it is determined whether or not the measurement of communication quality is completed for all directivities of the array antenna 28 of the sink device 20 (S24). When the measurement has not yet been completed (No in S24), the measurement unit 55 of the source device 1 repeats the processes of S22 and S23. That is, the measuring unit 55 changes the packet error rate (PER) calculated from the presence or absence of a packet error or a plurality of packet transmissions in the memory 5 while sequentially changing the direction Drx of the radio beam of the array antenna 28 from the arrows 41a to 41q. save.

  Next, when measurement of communication quality is completed for all directivities of the array antenna 28 (Yes in S24), it is determined whether or not measurement of communication quality is completed for all directivities of the array antenna 6 of the source device 1. (S25). If the measurement has not been completed yet (Yes in S25), the directivity direction Dtx of the array antenna 6 of the source device 1 is set to, for example, the arrow 41b, and the packet is transmitted to the sink device 20.

  The controller 21 of the sink device 20 receives packets while sequentially changing the directivity direction of the array antenna 28 from arrows 41a to 41q, and determines whether there is a packet error with respect to the direction Drx of each radio beam of the array antenna 28. Reply to 1. Then, the controller 11 of the source device 1 stores in the memory 5 the presence / absence of a packet error or the packet error rate (PER) calculated from a plurality of packet transmissions.

  In the same manner, whether or not there is a packet error for all combinations of the directivity of the array antenna 6 of the source device 1 (arrows 41a to 41q) and the directivity of the array antenna 28 of the sink device 20 (arrows 41a to 41q). Alternatively, the packet error rate (PER) calculated from a plurality of packet transmissions is stored in the memory 5.

  The notification unit 56 of the source device 1 extracts a measurement result exceeding a predetermined threshold from the measurement results stored in the memory 5 after the antenna direction scan of the array antenna 6 and the array antenna 28 is completed. . If there are two or more extracted measurement results, the current installation positions of the source device 1 and the sink device 20 are notified to the user as recommended positions (S26).

  Specifically, the packet error rate (PER) equal to or higher than a threshold value for which there is no packet error and communication is extracted from the memory 5, whether there is a packet error and whether there are two or more wireless beam communication paths, For example, display is performed using an LED lamp or the like. With this information, the user can confirm the communication status of the current installation position between the source device 1 and the sink device 20.

(Embodiment 3)
With reference to FIG. 7, the installation support method which concerns on Embodiment 3 of this invention is demonstrated. In the third embodiment, among the components of the source device 1 shown in FIG. 3, the measurement unit 55 and the notification unit 56 can be omitted. In addition, since many of the processes of the first and third embodiments are common, the following description will focus on differences.

  In the wireless HD, as a radio section rate Rw of a high-speed communication rate (HRP) signal for transmitting video data and audio data, 3 of mode 0 (about 1 Gbps), mode 1 (about 2 Gbps), and mode 2 (about 4 Gbps) are used. The type is specified. Normally, the radio section rate Rw is the data rate Rd that is input to the packet processing circuit 3 by reproducing video data and audio data from a recording medium such as a disc in the video / audio reproduction device 2, or the video from the packet processing circuit 23. The relationship of Rw> = Rd is established with respect to the data rate Rd of the video data and audio data input to the audio processing circuit 24.

  First, the wireless section rate of data transmitted from the source device 1 is set (S31). Specifically, the control data transmission / reception unit 62 of the sink device 20 transmits a transmission rate change instruction to the source device 1 through the array antenna 28. The transmission rate change instruction here indicates that the wireless section rate is set to Rw1. The transmission rate control unit 54 of the source device 1 that has received the transmission rate change instruction sets the wireless section rate to Rw1 based on the received transmission rate change instruction.

  Note that the wireless section rate Rw1 set here is preferably the minimum value of the wireless section rates larger than the data rate Rd of the transmission target data. This is because data can be transmitted without being compressed and the most stable communication quality can be expected.

  Next, the source device 1 and the sink device 20 execute the installation support method 1 (S11 to S15) shown in FIG. 5 (S32). That is, the communication quality is measured for all directivity combinations of the array antennas 6 and 28. Details have already been described and will be omitted. However, at this time, the result is not yet displayed (S16).

  Next, the sink device 20 extracts, from the memory 25, the received signal strength RSSI_t1 or the signal-to-noise ratio S / N_t1 that is equal to or higher than a communicable threshold after the antenna direction scan of the array antenna 6 and the array antenna 28 is completed. The presence or absence of RSSI_t1 or S / N_t1 is confirmed (S33).

  When there is no RSSI_t1 or S / N_t1 (No in S33), the transmission rate of the source device 1 is changed (S31). Specifically, the control data transmission / reception unit 62 of the sink device 20 transmits a transmission rate change instruction to the source device 1 through the array antenna 28. The transmission rate change instruction here indicates that the wireless section rate is set to Rw2. The transmission rate control unit 54 of the source device 1 that has received the transmission rate change instruction changes the wireless section rate from Rw1 to Rw2 based on the received transmission rate change instruction.

  The wireless section rate Rw2 set here is a wireless section rate equal to or lower than the data rate Rd of the transmission target data. Thereby, it is necessary to compress the data to be transmitted, but more stable communication quality can be expected.

  The source device 1 and the sink device 20 execute the installation support method 1 (S11 to S15) shown in FIG. 5 (S32). That is, for all combinations of the directivity (arrows 41a to 41q) of the array antenna 6 of the source device 1 and the directivity (arrows 41a to 41q) of the array antenna 28 of the sink device 20, the received signal strength (RSSI) or The measurement result of the signal to noise ratio (S / N) is stored in the memory 25.

  The sink device 20 extracts the received signal strength RSSI_t2 or the signal-to-noise ratio S / N_t2 equal to or higher than a communicable threshold value from the memory 25 after the scanning in the antenna direction of the array antenna 6 and the array antenna 28 is completed, and RSSI_t2 The presence / absence of S / N_t2 is confirmed (S33).

  Similarly, when there is no RSSI_t2 or S / N_t2 (No in S33), the radio section rate Rw of the source device 1 is sequentially set to be small, and the directivity (arrows 41a to 41a) of the array antenna 6 of the source device 1 is set. 41q) and the received signal strength (RSSI) or signal-to-noise ratio (S / N) are stored in the memory 25 for all combinations of the directivity (arrows 41a to 41q) of the array antenna 28 of the sink device 20.

  The notification unit 65 of the sink device 20 receives the received signal strength RSSI_tn (n = 1, 2,...) Or a signal pair equal to or higher than a communicable threshold after scanning of the array antenna 6 and the array antenna 28 in the antenna direction is completed. The noise ratio S / N_tn (n = 1, 2,...) Is extracted from the memory 25, and the presence or absence of RSSI_tn or S / N_tn and whether two or more RSSI_tn or S / N_tn exist are displayed on the display 26 ( S34). With this information, the user can check the communication status of the current installation position between the source device 1 and the sink device 20.

(Embodiment 4)
With reference to FIG. 8, the installation assistance method which concerns on Embodiment 4 of this invention is demonstrated. In the fourth embodiment, among the components of the sink device 20 shown in FIG. 3, the measurement unit 64 and the notification unit 65 can be omitted. In addition, since many of the processes of the second, third, and fourth embodiments are common, the following description will focus on differences.

  First, the wireless section rate of data transmitted from the source device 1 is set (S41). Specifically, the transmission rate control unit 54 of the source device 1 sets the wireless section rate to Rw1. Next, the source device 1 and the sink device 20 execute the installation support method 2 (S21 to S25) shown in FIG. 6 (S42). That is, the communication quality is measured for all directivity combinations of the array antennas 6 and 28. Details have already been described and will be omitted. However, at this time, the result is not yet displayed (S26).

  After the scanning of the antenna direction of the array antenna 6 and the array antenna 28 is completed, the source device 1 extracts the packet error rate PER_t1 that is communicable or a packet error rate PER_t1 that is equal to or greater than the threshold value, and checks whether PER_t1 exists (S43). If there is no PER_t1 (No in S43), the wireless section rate of the source device is changed from Rw1 to Rw2 (S41), and the installation support method 2 is executed again (S42).

  After the scanning of the antenna direction of the array antenna 6 and the array antenna 28 is completed, the source device 1 extracts the packet error PER_t2 that is communicable or a packet error PER_t2 that is equal to or greater than the threshold value, and checks the presence or absence of PER_t2. (S43).

  Similarly, when there is no packet error or no PER_t2 (No in S43), the radio section rate Rw of the source device 1 is sequentially set to be small, and the directivity (arrows 41a to 41a) of the array antenna 6 of the source device 1 is set. 41q) and the packet error rate (PER) calculated from a plurality of packet transmissions in the memory 5 for all combinations of the directivity (arrows 41a to 41q) of the array antenna 28 of the sink device 20 are stored in the memory 5. To do.

  The notification unit 56 of the source device 1 performs the packet error rate PER_tn (n = 1, 2,...) Greater than or equal to the presence or absence of a packet error or a communicable threshold after scanning of the array antenna 6 and the array antenna 28 in the antenna direction is completed. .) Is extracted from the memory 5, and the presence or absence of PER_tn and whether two or more PER_tn exist are displayed on the display 26 (S44). With this information, the user can check the communication status of the current installation position between the source device 1 and the sink device 20.

  In the first to fourth embodiments, the direction of the radio beam radiated / incident from the array antenna is set to 17 in 45 degree units in the horizontal direction (X direction) and the vertical direction (Y direction). Other values may be used.

  In the first to fourth embodiments, the presence / absence of the received signal strength RSSI_t or the signal-to-noise ratio S / N_t that is equal to or higher than a communicable threshold and whether there are two or more RSSI_t or S / N_t are displayed on the display. However, you may display with LED etc. which were provided around the display.

  In the above embodiment, the packet radio transmission / reception circuits 4 and 22 include a high-frequency circuit, a baseband processing circuit, a medium access control circuit, and the like, but any radio transmission method may be used. For example, a wireless transmission method defined by IEEE 802.11 using a 2.4 GHz band or a 5 GHz band radio wave may be used, or a wireless transmission system using a millimeter wave band radio wave may be used. Detailed description is omitted.

(Other variations)
Although the present invention has been described based on the above embodiment, it is needless to say that the present invention is not limited to the above embodiment. The following cases are also included in the present invention.

  Specifically, each of the above devices is a computer system including a microprocessor, ROM, RAM, a hard disk unit, a display unit, a keyboard, a mouse, and the like. A computer program is stored in the RAM or the hard disk unit. Each device achieves its functions by the microprocessor operating according to the computer program. Here, the computer program is configured by combining a plurality of instruction codes indicating instructions for the computer in order to achieve a predetermined function.

  Part or all of the constituent elements constituting each of the above-described devices may be configured by one system LSI (Large Scale Integration). For example, the packet processing circuit 3, the packet radio transmission / reception circuit 4, the memory 5, and the controller 11 in the broken line frame in FIG. 2, that is, the source device 1 may be mounted on a one-chip LSI. Similarly, the controller 21, the packet radio transmission / reception circuit 22, the packet processing circuit 23, and the memory 25 of the sink device 20 may be mounted on a one-chip LSI.

  The system LSI is an ultra-multifunctional LSI manufactured by integrating a plurality of component parts on one chip, and specifically, a computer system including a microprocessor, a ROM, a RAM, and the like. is there. A computer program is stored in the RAM. The system LSI achieves its functions by the microprocessor operating according to the computer program.

  Some or all of the constituent elements constituting each of the above devices may be configured as an IC card or a single module that can be attached to and detached from each device. The IC card or module is a computer system that includes a microprocessor, ROM, RAM, and the like. The IC card or the module may include the super multifunctional LSI described above. The IC card or the module achieves its functions by the microprocessor operating according to the computer program. This IC card or this module may have tamper resistance.

  The present invention may be the method described above. Further, the present invention may be a computer program that realizes these methods by a computer, or may be a digital signal composed of a computer program.

  The present invention also relates to a computer-readable recording medium capable of reading a computer program or a digital signal, such as a flexible disk, hard disk, CD-ROM, MO, DVD, DVD-ROM, DVD-RAM, BD (Blu-ray Disc), It may be recorded in a semiconductor memory or the like. Further, it may be a digital signal recorded on these recording media.

  In the present invention, a computer program or a digital signal may be transmitted via an electric communication line, a wireless or wired communication line, a network represented by the Internet, a data broadcast, or the like.

  The present invention may also be a computer system including a microprocessor and a memory, the memory storing the computer program, and the microprocessor operating according to the computer program.

  Further, the program or digital signal may be recorded on a recording medium and transferred, or the program or digital signal may be transferred via a network or the like, and may be executed by another independent computer system.

The above embodiment and the above modification examples may be combined.
As mentioned above, although embodiment of this invention was described with reference to drawings, this invention is not limited to the thing of embodiment shown in figure. Various modifications and variations can be made to the illustrated embodiment within the same range or equivalent range as the present invention.

  The present invention can be used particularly for installation support of millimeter-wave wireless devices in a wireless communication system compliant with a wireless communication standard such as wireless HD.

DESCRIPTION OF SYMBOLS 1 Source apparatus 2 Video / audio reproduction device 3,23 Packet processing circuit 4,22 Packet radio | wireless transmission / reception circuit 5,25 Memory 6,28 Array antenna 11,21 Controller 20 Sink apparatus 24 Video / audio processing circuit 27 Speaker 26 Display 41a, 41b, 41c, 41d, 41e, 41f, 41g, 41h, 41i, 41j, 41k, 41l, 41m, 41n, 41o, 41p, 41q Arrow 51 Content transmission unit 52, 62 Control data transmission / reception unit 53, 63 Directivity control unit 54 Transmission Rate control unit 55, 64 Measurement unit 56, 65 Notification unit 61 Content reception unit 100 Media receiver 102 Media receiver interface 103, 112 Processor 104, 111 Baseband processing component 105, 110 Phase array antenna 106, 10 Wireless communication channel interface 113 a media player interface 114 media player 115 displays 140 the transmitter device 141 receiver device

Claims (13)

A wireless communication device that receives data wirelessly transmitted by a counterpart device capable of changing the antenna directivity,
An antenna that can change directivity,
A receiver for receiving the data through the antenna;
A measuring unit that measures the communication quality of the data received by the receiving unit for each combination of directivity of both antennas while changing the directivity of the antennas of the wireless communication device and the counterpart device,
Informing the user of the current installation position of the wireless communication apparatus and the counterpart apparatus as a recommended position when there are a plurality of combinations of directivities in which the communication quality measured by the measurement unit exceeds a predetermined threshold A wireless communication device. The wireless communication device further includes:
A directivity control unit for changing the directivity of the antenna;
A directivity change instruction for changing the directivity of the antenna of the counterpart device, and a transmitter that transmits the directivity change instruction to the counterpart device through the antenna;
The measurement unit causes the directivity control unit to sequentially change the directivity of the antenna and causes the transmission unit to transmit the directivity change instruction when measurement of communication quality is performed with all the directivities of the antenna. The wireless communication apparatus according to claim 1. The transmitting unit further transmits a transmission rate change instruction for changing the transmission rate of the data from the first transmission rate to a second transmission rate smaller than the first transmission rate to the counterpart device through the antenna. ,
The measuring unit measures the communication quality of the data transmitted at the first transmission rate. As a result, when there are not a plurality of combinations of directivities in which the communication quality exceeds the threshold, the measuring unit The wireless communication apparatus according to claim 2, wherein the transmission rate change instruction is transmitted, and communication quality of the data transmitted at the second transmission rate is measured. The directivity control unit is
When the data is transmitted at the first transmission rate, the antenna directivity is changed at a first interval;
The radio communication device according to claim 3, wherein when the data is transmitted at the second transmission rate, the directivity of the antenna is changed at a second interval wider than the first interval. The transmitting unit communicates with the counterpart device using an LRP (Low-Rate Physical Layer) method,
The wireless communication device according to any one of claims 2 to 4, wherein the reception unit communicates with the counterpart device using an HRP (High-Rate Physical Layer) method. The wireless communication apparatus according to claim 1, wherein the measurement unit measures at least one of a received signal strength at the antenna and a signal-to-noise ratio. A wireless communication device that wirelessly transmits data to a partner device capable of changing the antenna directivity,
An antenna that can change directivity,
A transmission / reception unit that transmits the data through the antenna and receives a reception confirmation indicating that the data has been received from the counterpart device;
A measurement unit that measures the data error rate based on the reception confirmation received by the transmission / reception unit for each combination of directivity of both antennas while changing the directivity of the antennas of the wireless communication device and the counterpart device. When,
When there are a plurality of combinations of directivities in which the data error rate measured by the measurement unit exceeds a predetermined threshold, the current installation position of the wireless communication apparatus and the counterpart apparatus is notified to the user as a recommended position. A wireless communication device comprising a notification unit. The wireless communication apparatus further includes a transmission rate control unit that changes a transmission rate of the data,
The measurement unit measures a data error rate when the data is transmitted at a first transmission rate, and when there are not a plurality of combinations of directivities in which the data error rate exceeds the threshold, the transmission rate The wireless communication apparatus according to claim 7, wherein the control unit causes the transmission rate of the data to be changed to a second transmission rate that is smaller than the first transmission rate. The data rate of the data is set to be smaller than the first transmission rate and larger than the second transmission rate,
The wireless communication device according to claim 8, wherein the transmission unit compresses the data when transmitting the data at the second transmission rate. A wireless communication system comprising a first wireless communication device and a second wireless communication device that receives data wirelessly transmitted from the first wireless communication device,
The first wireless communication device is:
A first antenna capable of changing directivity;
A transmission unit for transmitting the data through the first antenna;
The second wireless communication device is:
A second antenna capable of changing directivity;
A receiving unit for receiving the data through the second antenna;
A measuring unit that measures the communication quality of the data received by the receiving unit for each combination of directivity of both antennas while changing the directivity of the first and second antennas;
When there are a plurality of combinations of directivities in which the communication quality measured by the measurement unit exceeds a predetermined threshold, the current installation positions of the first and second wireless communication devices are notified to the user as recommended positions A wireless communication system comprising a notification unit. An installation support method for notifying a user of a preferred installation position between a first wireless communication device and a second wireless communication device that receives data wirelessly transmitted from the first wireless communication device,
Each of the first and second wireless communication devices includes an antenna capable of changing directivity,
The installation support method is:
Measure the communication quality of the data received by the second wireless communication device for each combination of directivity of both antennas while changing the directivity of the antennas of the first and second wireless communication devices. Measuring steps;
When there are a plurality of combinations of directivities in which the communication quality measured in the measurement step exceeds a predetermined threshold, the current installation positions of the first and second wireless communication devices are notified to the user as recommended positions. An installation support method including a notification step. An integrated circuit that receives data wirelessly transmitted by a partner device that can change the antenna directivity using an antenna that can change the directivity,
A receiver for receiving the data through the antenna;
A measuring unit that measures the communication quality of the data received by the receiving unit for each combination of directivity of both antennas while changing the directivity of the antenna connected to the integrated circuit and the antenna of the counterpart device When,
An integrated circuit comprising: a notification unit that notifies a user of the current installation position as a recommended position when there are a plurality of combinations of directivities in which the communication quality measured by the measurement unit exceeds a predetermined threshold. An integrated circuit that wirelessly transmits data to a counterpart device that can change the antenna directivity using an antenna that can change the directivity,
A transmitter for transmitting the data through the antenna;
A reception unit for receiving a reception confirmation indicating that the data has been received from the counterpart device;
While changing the directivity of the antenna connected to the integrated circuit and the antenna of the counterpart device, the data error rate is set based on the reception confirmation received by the receiver for each combination of directivity of both antennas. A measuring section to measure,
An integrated circuit comprising: a notification unit that notifies a user of the current installation position as a recommended position when there are a plurality of combinations of directivities in which the data error rate measured by the measurement unit exceeds a predetermined threshold.

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