JP2015032980A - Information processing device, information system, and computer program - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an information processing device, an information system, and a computer program that shorten a communication disabled period occurring when a radio channel is switched at a time of the occurrence of interference.SOLUTION: When an on-vehicle device 1 functioning as an access point detects interference on an active channel Ch01 (403), it requests a mobile device B not performing communication with the on-vehicle device 1 to perform channel scan (404). The mobile device B performs channel scan to sequentially survey the use state of each radio channel (405), and returns the channel scan result to the on-vehicle device 1 (406). If prescribed switching timing has come (407), the on-vehicle device 1 switches the active channel from the radio channel Ch01 to an idle channel Ch08, a radio channel that can be used without interference according to the channel scan result (408).

Description

  The present invention relates to a channel switching technique when interference occurs in a wireless LAN.

  As a technique for channel switching when interference occurs in a wireless LAN, when an interference occurs in a working channel when a specific wireless channel is used as a working channel in an access point, other techniques that can be used without interference A technique for searching for a radio channel and changing the active channel to the searched radio channel is known (for example, Patent Document 1).

JP 2009-201165 A

  In the access point, when a specific radio channel is used as a working channel for communication, when interference occurs in the working channel, another radio channel that can be used without interference is searched, and the working radio channel is searched for. According to the technology to be changed, while searching for a wireless channel that can be used without interference, communication using the previous active channel cannot be performed, and the search requires a relatively long time. When the channel is switched, a relatively long communication impossible state occurs.

  Therefore, an object of the present invention is to shorten the communication incapability period that occurs when a radio channel used for communication performed when interference occurs is switched.

  In order to achieve the above object, the present invention functions as a wireless LAN access point using a wireless channel set as a working channel for a plurality of other devices, and the other device connected to the wireless LAN and the wireless The in-vehicle device among the other devices connected to the in-vehicle device via the wireless LAN when interference of a predetermined level or more with respect to the active channel occurs in the information processing device that performs communication via the LAN Wireless devices that can be used for communication without interference by causing the other devices that are not communicating with each other to investigate the usage status of each wireless channel that can be used for the wireless LAN via the wireless LAN. The active channel is switched between the empty channel detection unit to be detected and the empty channel detected by the empty channel detection unit. Those having a working channel switching unit.

  According to such an information processing apparatus, when interference exceeding a predetermined level occurs in the working channel used for communication, communication is performed at that time while maintaining the communication of the working channel being performed at that time. A channel scan for investigating the use status of each wireless channel that can be used for a wireless LAN using another device that is not used is performed, and then the working channel is switched to an empty channel discovered by the channel scan. Therefore, even during execution of the channel scan, there is no communication disabled period with other devices other than the other device that performed the channel scan. As a result, the radio channel used for communication performed when interference occurs as a whole It is possible to shorten the communication inability period that occurs at the time of switching.

  Here, in such an information processing apparatus, the working channel switching unit is connected to the in-vehicle device via the wireless LAN when interference of a predetermined level or more with respect to the working channel occurs. When the communication is performed, the working channel may be switched to the empty channel at a timing when no significant data transmission / reception is performed.

  In addition, such an information processing device is connected to the other device connected to the in-vehicle device via the wireless LAN when interference of a predetermined level or more with respect to the working channel occurs in the working channel switching unit. When the music to be streamed is continuously transmitted and received in the information processing apparatus, the working channel may be switched to the empty channel at the timing of switching of the music to be transmitted and received.

  In addition, in the information processing device, the working channel switching unit is connected to the in-vehicle device via the wireless LAN when interference of a predetermined level or more occurs in the working channel. When the video to be streamed is transmitted / received between the other device and the information processing device, the working channel is switched to the empty channel at the timing of switching the stream or scene of the video to be transmitted / received. It may be configured.

  In addition, such an information processing device is connected to the other device connected to the in-vehicle device via the wireless LAN when interference of a predetermined level or more with respect to the working channel occurs in the working channel switching unit. In the information processing apparatus, when navigation data used for route guidance along the guidance route that is the route to the destination is sent and received, the route guidance of the right / left turn point of the guidance route will be provided within a predetermined period in the future. You may comprise so that the said working channel may be switched to the said empty channel at the timing which does not generate | occur | produce.

By doing so, significant data transmitted / received in the communication cannot be used due to the occurrence of a communication incommunicable period that occurs when the active channel is switched to an empty channel, or for audio and video users. It is possible to suppress the output from being interrupted during reproduction.
Here, these information processing apparatuses may be information processing apparatuses mounted on an automobile.
The wireless LAN may be an IEEE 802.11 standard wireless LAN, so-called Wi-Fi.

  As described above, according to the present invention, it is possible to shorten the communication disabled period that occurs when the radio channel used for communication performed when interference occurs is switched.

It is a block diagram which shows the structure of the vehicle-mounted apparatus which concerns on embodiment of this invention. It is a block diagram which shows the structure of the mobile apparatus which concerns on embodiment of this invention. It is a flowchart showing the channel switching control process which concerns on embodiment of this invention. It is a figure which shows the process example of the channel switching control process which concerns on embodiment of this invention. It is a figure which shows the other structural example of embodiment of this invention.

Hereinafter, embodiments of the present invention will be described.
FIG. 1 shows the configuration of an information system according to this embodiment.
As shown in the figure, the information system includes an in-vehicle device 1 mounted on an automobile and a mobile device 2 that is a device carried by a user such as a smartphone, a tablet terminal, a mobile phone, or a PDA. Further, the mobile device 2 can be connected to the in-vehicle device 1 by a wireless LAN of IEE802.11 (Wi-Fi) standard.

  Next, as shown in the figure, the in-vehicle device 1 includes an input device 101, a display device 102, a voice input / output device 103 provided with a microphone, a speaker, and the like, a disk drive 104 that reproduces a recording disk such as a CD or a DVD, a storage Device 105, other peripheral devices 106, operating system 107 of in-vehicle device 1, application managed by operating system 107 and running on operating system 107, Wi-Fi interface 108 for performing communication via wireless LAN of IEE802.11 standard It has.

In addition, the operating system 107 is equipped with a Wi-Fi driver 1071 that controls the communication operation of the Wi-Fi interface 108.
The peripheral device 106 of the in-vehicle device 1 is, for example, a broadcast receiver for radio broadcasting or television broadcasting.
Here, the in-vehicle device 1 includes the media player application 121, the navigation client application 122, the channel switching control application 123, and the like as the applications described above.
Next, FIG. 2 shows a configuration of the mobile device 2.
As illustrated, the mobile device 2 includes an operation unit 201, a display 202, a voice input / output unit 203 including a microphone and a speaker, a storage unit 204, a mobile communication device 205 for accessing a mobile telephone network, and other peripherals. Device 206, mobile operating system 207 which is the OS of mobile device 2, mobile application which is managed by mobile operating system 207 and runs on mobile operating system 207, mobile which is a wireless communication interface in accordance with IEEE 802.11 standard A Wi-Fi interface 208 is provided.

The mobile operating system 207 is provided with a mobile Wi-Fi driver 2071 that controls the communication operation of the mobile Wi-Fi interface 208.
Here, the peripheral device 206 of the in-vehicle apparatus 1 is, for example, a GPS receiver or a gyro sensor.
Further, the mobile device 2 includes a mobile phone application 221, a player application 222, a navigation application 223, a channel scan application 224, and the like as mobile applications.

  In such a configuration, the Wi-Fi interface 108 of the in-vehicle device 1 functions as a wireless LAN access point / router that uses one specific wireless channel for communication with each mobile device 2. When the mobile device 2 is located at a short distance, the mobile Wi-Fi interface 208 of the mobile device 2 can be connected to the Wi-Fi interface 108 of the in-vehicle device 1 as a client. Here, for convenience, the communication channel connection between the in-vehicle device 1 and the mobile device 2 using the Wi-Fi interface 108 and the mobile Wi-Fi interface 208 will be referred to as “WiFi connection” below.

Further, once connection information such as a wireless LAN (access point) identifier (SSID) and authentication information (password) is set in the mobile device 2, the Wi-Fi interface 108, the mobile Wi-Fi interface 208, When communication becomes possible, a WiFi connection is automatically established between the in-vehicle device 1 and the mobile device 2.
The frequency band and the number of wireless channels of the wireless LAN are 2.4 GHz band and 14 channels in IEEE 802.11b, 2.4 GHz band and 19 channels in IEEE 802.11a, 13 channels in 5 GHz band in IEEE 802.11g, and 2.4 / It is defined as 5 GHz band and 14/19 channel.
Then, the application and the mobile application can communicate with each other while using the functions of the operating system 107 and the mobile operating system 207 via the WiFi connection.
In FIG. 2, a mobile phone application 221 of the mobile device 2 is an application that provides a mobile phone function using the mobile communication device 205, the voice input / output unit 203, and the operation unit 201.
The player application 222 of the mobile device 2 is an application that performs reproduction output of audio data and video data recorded in the storage unit 204 to the audio input / output unit 203 and the display 202.
Further, the player application 222 of the mobile device 2 operates according to control from the media player application 121 of the in-vehicle device 1 via the WiFi connection when the mobile device 2 is connected to the in-vehicle device 1 by WiFi, and is stored in the storage unit 204. A process of transmitting the recorded video data or audio data stream to the media player application 121 of the in-vehicle device 1 is performed.

  Next, the navigation application 223 of the mobile device 2 uses the GPS receiver, the gyro sensor, and the map data stored in the storage unit 204 provided as the peripheral device 206 to the current position and the destination set by the user. A navigation screen showing the route on the map is generated and output to the display 202, or the voice input / output unit 203 for navigation voice that guides the right / left turn direction of the right / left turn point before the right / left turn point on the route. Output.

  In addition, the navigation application 223 of the mobile device 2 operates in accordance with the control from the navigation client application 122 of the in-vehicle device 1 via the WiFi connection when the mobile device 2 is connected to the in-vehicle device 1 by WiFi. A process of transmitting the screen and navigation voice to the navigation client application 122 of the in-vehicle device 1 is performed.

Also, the channel scan application 224 of the mobile device 2 uses the mobile Wi-Fi interface 208 via the mobile Wi-Fi driver 2071 to scan each wireless channel of the wireless LAN and check the usage status of each wireless channel. Is an application.
Next, in FIG. 1, the media player application 121 of the in-car device 1 outputs the broadcast received by the broadcast receiver provided as the peripheral device 106 to the audio input / output device 103 and the display device 102, the storage device 105, and the disk. Audio data and video data recorded on a recording disk mounted on the drive 104 are reproduced and reproduced on the audio input / output device 103 and the display device 102.

  The media player application 121 of the in-vehicle device 1 controls the player application 222 of the mobile device 2 via the WiFi connection or the mobile device via the WiFi connection when the in-vehicle device 1 and the mobile device 2 are connected by WiFi. Streaming reproduction of the stream of audio data and video data received from the second player application 222 and output to the audio input / output device 103 and the display device 102 are also performed.

  Next, when the in-vehicle device 1 and the mobile device 2 are connected by WiFi, the navigation client application 122 of the in-vehicle device 1 controls the navigation application 223 of the mobile device 2 via the WiFi connection or via the WiFi connection. Output of navigation screen received from navigation application 223 of mobile device 2 to display device 102, output of navigation voice received from navigation application 223 of mobile device 2 via WiFi connection to voice input / output device 103, etc. Also do.

Hereinafter, channel switching control processing performed by the channel switching control application 123 of the in-vehicle device 1 in such a configuration will be described.
FIG. 3 shows the procedure of this channel switching control process.
As shown in the figure, the channel switching control application 123 of the in-vehicle device 1 monitors the occurrence of interference at a level equal to or higher than a predetermined threshold with the working channel, which is the wireless channel that the Wi-Fi interface 108 is currently using for communication. (Step 302).
Here, the interference level with the working channel is determined by acquiring information related to the communication quality of the Wi-Fi interface 108 via the Wi-Fi driver 1071. The interference level is calculated based on a decrease in communication speed, instantaneous disconnection, fluctuation in signal reception strength of the working channel, S / N ratio of the received signal on the working channel, signal reception leakage level on the working channel, etc. .

In addition, the predetermined threshold used in step 302 is a level where interference is smaller by a predetermined margin than an interference level at which normal communication using the working channel cannot be practically performed.
If interference at a level equal to or greater than a predetermined threshold value occurs in the active channel (step 302), the mobile device 2 currently connected to the in-vehicle device 1 by WiFi is connected with the application of the in-vehicle device 1. Whether or not there is a mobile device 2 that does not communicate with each other is checked (step 304), and if it does not exist, the process returns to the monitoring of step 302.

  On the other hand, when there is a mobile device 2 that does not communicate with the application of the in-vehicle device 1 among the mobile devices 2 connected to the in-vehicle device 1 by WiFi (step 304), the communication with the application of the in-vehicle device 1 is performed. One of the mobile devices 2 that has not been set is set as a probe device (step 306).

Then, a channel scan request is issued via the WiFi connection to the channel scan application 224 of the mobile device 2 set in the probe device (step 308).
Here, the channel scan application 224 of the mobile device 2 that has received the channel scan request from the channel switching control application 123 of the in-vehicle device 1 controls the mobile Wi-Fi interface 208 via the mobile Wi-Fi driver 2071 and wirelessly Each wireless channel of the LAN is sequentially scanned, the usage status of each wireless channel is investigated, and the survey result is returned to the channel switching control application 123 of the in-vehicle device 1 as the channel scan result.

  On the other hand, if the channel scan result is received from the channel scan application 224 of the mobile device 2 set in the probe device in this way (step 310), the channel switching control application 123 of the in-vehicle device 1 Whether there is a free channel that is a wireless channel that can be used for wireless communication without interference with another access point is checked (step 312). If there is no free channel, the process returns to the monitoring in step 302.

On the other hand, when there is an empty channel (step 312), the process waits for the arrival of the switching timing (step 314). This switching timing will be described later.
If the switching timing has arrived (step 314), the Wi-Fi interface 108 is controlled via the Wi-Fi driver 1071, the active channel is switched to an empty channel (step 316), and the process returns to the monitoring of step 302.
Here, the switching timing for waiting for arrival in step 314 will be described.
The switching timing is immediate when there is no mobile device 2 communicating with the application of the in-vehicle device 1.
In addition, when there is a mobile device 2 that communicates with an application of the in-vehicle device 1, the occurrence of a period in which communication between the application of the in-vehicle device 1 and the mobile application of the mobile device 2 does not occur Time is the switching timing.
That is, for example, the media player application 121 of the in-car device 1 continuously receives a stream of audio data of a plurality of pieces of music from the player application 222 of the mobile device 2, plays it back, and outputs it from the audio input / output device 103. In this case, the timing at which the reception of the audio data stream of one music piece is completed, that is, the timing at which the music piece to be received and reproduced and output is switched. Note that the detection of the timing at which the reception of the audio data stream of one music piece is completed in the channel switching control application 123 is performed by, for example, notifying the timing from the media player application 121 to the channel switching control application 123.

  However, the media player application 121 of the in-vehicle device 1 includes a buffer, and a stream of audio data received from the player application 222 of the mobile device 2 is temporarily stored in the buffer, and then the audio data is reproduced and output, and the audio The earliest timing at which the state where data is stored in the buffer at a size equal to or larger than the predetermined data size may be set as the switching timing. In this case, audio data may be reproduced and output so that unreproduced audio data remaining in the buffer is maintained at a predetermined data size or more, and the switching timing may be set immediately.

  However, the predetermined data size of the audio data is required until the communication connection between the navigation client application 122 of the in-vehicle device 1 and the navigation application of the mobile device 2 is reestablished after the switching of the working channel is started. The audio data size is equal to the playback time longer than the expected time.

  When the media player application 121 of the in-vehicle device 1 receives a video data stream from the player application 222 of the mobile device 2, performs streaming playback, and outputs it from the audio input / output unit 203, the video data stream The switching timing is defined as the timing at which reception of the title, chapter, or scene to be received, reproduced and output is switched. In addition, the detection of the timing as these switching timings is performed by, for example, detecting the timing in the media player application 121 and notifying the channel switching control application 123.

  Next, for example, when communication is performed between the navigation client application 122 of the in-vehicle device 1 and the navigation application of the mobile device 2, the above-described generation of the navigation sound is not expected for a predetermined time or more. The earliest timing.

  Note that the predetermined time is expected to be required until the communication connection between the navigation client application 122 of the in-vehicle device 1 and the navigation application of the mobile device 2 is reestablished after the switching of the working channel is started in step 316. More than

  The channel switching control application 123 detects the arrival of a period during which no output of navigation audio is expected, for example, by inquiring the navigation client application 122 about the next output time of the navigation audio. The navigation client application 122 calculates the output time of the next navigation audio from the required time to the next right / left turn point obtained by making an inquiry to the navigation application 223 of the mobile device 2 and responds to the navigation client application 122.

The channel switching control process performed by the channel switching control application 123 of the in-vehicle device 1 has been described above.
In the above channel switching control process, step 314 may be omitted, and if it is determined in step 312 that an empty channel exists, the process may proceed to step 316 as it is to switch the active channel to an empty channel.
An example of the channel switching control process as described above is shown in FIG.
As shown in the figure, the three mobile devices 2 of A, B, and C have a WiFi connection (401) to the in-vehicle device 1 functioning as an access point that uses the wireless channel of Ch01 as an active channel. And
In this case, in the state where only the communication (402) between the application of the in-vehicle device 1 and the mobile application of the mobile device A is performed, interference with the active channel Ch01 occurs, and the channel switching control application 123 of the in-vehicle device 1 is generated. When it is detected that the interference level for the working channel Ch01 exceeds the threshold value (403), the channel switching control application 123 of the in-vehicle device 1 does not perform communication with the application of the in-vehicle device 1. A channel scan is requested to the channel scan application 224 of the device B (404).

  Upon receiving the channel scan request, the channel scan application 224 of the mobile device B executes channel scan for sequentially checking the status of each radio channel (405), and the channel scan result is used as the channel switching control application 123 of the in-vehicle device 1 Respond via channel Ch01 (406).

  The channel switching control application 123 of the in-vehicle apparatus 1 that has received the channel scan result waits for the switching timing described above, and if the switching timing occurs (407), the current channel is obtained from the radio channel Ch01 from the channel scan result. Switching to a free channel Ch08, which is a radio channel not used by another access point (408).

As a result, by switching the working channel, the WiFi connection between the three mobile devices 2 of A, B, and C and the in-vehicle device 1 and the communication connection between the application of the in-vehicle device 1 and the mobile application of the mobile device A are Once disconnected.
The three mobile devices 2 of A, B, and C that have been disconnected from the WiFi automatically reconnect to the in-vehicle device 1 functioning as an access point that uses the wireless channel of Ch08 as an active channel at this time. Connect (409). Thereafter, the communication connection between the application of the in-vehicle device 1 and the mobile application of the mobile device A is established again, and the communication (410) between the two applications is resumed.

The embodiment of the present invention has been described above.
By the way, although the above embodiment demonstrated the case where the vehicle-mounted apparatus 1 functions as an access point, as shown in FIG. 5A, the mobile apparatus X functions as an access point, and the vehicle-mounted apparatus 1 and other mobile devices Y The same can be applied to the case where a WiFi connection is made to the mobile device X functioning as an access point as a client. That is, in this case, the channel switching control application 123 may be provided in the mobile device X that functions as an access point, and the channel scan application 224 may be provided in the in-vehicle device 1 or the mobile device Y.

  Further, the present embodiment can be similarly applied to the case where the in-vehicle device 1 is simultaneously connected to a plurality of wireless LANs. That is, for example, as shown in FIG. 5b, the in-vehicle device 1 includes a plurality of Wi-Fi interfaces A and B, and functions as an access point using the wireless channel Chn as a client in the Wi-Fi interface A and as a client. When the mobile device Y, Z is accommodated as a client by connecting to the device X and the Wi-Fi interface B functions as a wireless channel Chm access point, there is interference in the wireless channel Chm of the Wi-Fi interface B. If it occurs, if it is not communicating with the mobile device X via the Wi-Fi interface A, the mobile device X performs a channel scan via the Wi-Fi interface A to find a free channel, Switch the wireless channel used by Wi-Fi interface B to a free channel found from wireless channel Chm. It may be so that.

  As described above, according to the present embodiment, when interference of a level higher than a predetermined threshold occurs in the working channel used for wireless LAN communication, the working channel communication performed at that time is maintained. Then, after performing a channel scan to investigate the use status of each wireless channel that can be used for the wireless LAN using the mobile device 2 that is not communicating at that time, the free channel discovered by the channel scan is checked. Switch the working channel. Therefore, during the channel scan, there is no communication disabled period with the mobile devices 2 other than the mobile device 2 that has performed the channel scan. As a result, the communication performed when interference occurs as a whole. It is possible to shorten the communication incapacity period that occurs when the radio channel used for the switching is switched.

  In addition, there is a predetermined time until the completion of reception of the data stream of audio data or video data, the timing of switching the title, chapter, or scene of the video data to be received and reproduced and output, and the next navigation audio output. Because the active channel is switched to an empty channel at a timing when significant data is expected not to be received, such as when it is expected to occur, due to the occurrence of an incommunicable period of communication that occurs when the active channel is switched to an empty channel Therefore, it is possible to prevent the significant data from being used or the audio / video playback output from being interrupted during playback.

  DESCRIPTION OF SYMBOLS 1 ... In-vehicle device, 2 ... Mobile device, 101 ... Input device, 102 ... Display device, 103 ... Voice input / output device, 104 ... Disk drive, 105 ... Storage device, 106 ... Peripheral device, 107 ... Operating system, 108 ... Wi -Fi interface 121 ... media player application 122 ... navigation client application 123 ... channel switching control application 201 ... operation unit 202 ... display 203 ... voice input / output unit 204 ... storage unit 205 ... mobile communication device, 206 ... Peripheral device, 207 ... Mobile operating system, 208 ... Mobile Wi-Fi interface, 221 ... Mobile phone application, 222 ... Player application, 223 ... Navigation application, 224 ... Channel scan application, 1071 ... Wi-Fi driver, 2071 ... Mobile Wi-Fi driver.

Claims (20)

An information processing device that functions as a wireless LAN access point that uses a wireless channel set as a working channel for a plurality of other devices and communicates with the other devices connected to the wireless LAN via the wireless LAN. There,
When an interference of a predetermined level or more with respect to the working channel occurs, the other device not communicating with the in-vehicle device among the other devices connected to the in-vehicle device via the wireless LAN, An empty channel detection unit that detects a wireless channel that can be used for communication without interference as an empty channel by investigating the usage status of each wireless channel that can be used for the wireless LAN via the wireless LAN;
An information processing apparatus comprising: an active channel switching unit that switches the active channel to the empty channel detected by the empty channel detection unit. The information processing apparatus according to claim 1,
When the working channel switching unit communicates with the other device connected to the in-vehicle device via the wireless LAN when interference of a predetermined level or more with respect to the working channel occurs, An information processing apparatus, wherein the working channel is switched to the empty channel at a timing when no significant data is transmitted / received by communication. The information processing apparatus according to claim 1,
The working channel switching unit, when an interference of a predetermined level or more with respect to the working channel occurs, the other device connected to the in-vehicle device via the wireless LAN and the music to be played by streaming in the information processing device An information processing apparatus characterized by switching the working channel to the empty channel at the timing of switching of music to be transmitted and received when continuously transmitting and receiving. The information processing apparatus according to claim 1,
The working channel switching unit, when an interference of a predetermined level or more with respect to the working channel occurs, the other device connected to the in-vehicle device via the wireless LAN and the video to be played by streaming in the information processing device An information processing apparatus characterized in that, when transmission / reception is performed, the working channel is switched to the empty channel at the timing of switching of a video stream or scene to be transmitted / received. The information processing apparatus according to claim 1,
The working channel switching unit, when interference of a predetermined level or more with respect to the working channel occurs, in the other apparatus and the information processing apparatus connected to the in-vehicle apparatus via the wireless LAN, When sending and receiving navigation data used for route guidance along the guidance route, which is a route, at the timing when the route guidance of the right and left turn points of the guidance route will not occur within a predetermined period in the future, An information processing apparatus for switching the working channel. The information processing apparatus according to claim 1, 2, 3, 4 or 5,
The information processing apparatus is an information processing apparatus mounted on an automobile. The information processing apparatus according to claim 1, 2, 3, 4, 5 or 6,
The information processing apparatus according to claim 1, wherein the wireless LAN is an IEEE 802.11 standard wireless LAN. A plurality of mobile devices, and an information processing device that functions as a wireless LAN access point using a wireless channel set as a working channel for the plurality of mobile devices and communicates with the mobile device connected to the wireless LAN; An information system comprising:
Each of the mobile devices is
A channel unit for investigating the use status of each wireless channel that can be used in the wireless LAN;
The information processing apparatus includes:
The channel of the mobile device not communicating with the in-vehicle device among the mobile devices connected to the in-vehicle device via the wireless LAN when interference of a predetermined level or more with respect to the working channel occurs An empty channel detection unit that detects a wireless channel that can be used for communication without interference as an empty channel by causing a scanning unit to check the usage status of each wireless channel that can be used for the wireless LAN via the wireless LAN; ,
An information system comprising: an active channel switching unit that switches the active channel to the empty channel detected by the empty channel detection unit. The information system according to claim 8, wherein
The active channel switching unit before the information processing device communicates with the other device connected to the in-vehicle device via the wireless LAN when interference of a predetermined level or more with respect to the active channel occurs. If there is, the information system is characterized in that the working channel is switched to the empty channel at a timing when no significant data transmission / reception is performed. The information system according to claim 8, wherein
The working channel switching unit of the information processing apparatus includes: the mobile device connected to the in-vehicle device via the wireless LAN and the information processing device when interference of a predetermined level or more with respect to the working channel occurs. An information system characterized in that, when music for streaming playback is continuously transmitted and received, the working channel is switched to the empty channel at the timing of switching of the music to be transmitted and received. The information system according to claim 8, wherein
The working channel switching unit of the information processing apparatus includes: the mobile device connected to the in-vehicle device via the wireless LAN and the information processing device when interference of a predetermined level or more with respect to the working channel occurs. An information system characterized in that when a video to be streamed is transmitted / received, the working channel is switched to the empty channel at the timing of switching of a stream or scene of the video to be transmitted / received. The information system according to claim 8, wherein
The working channel switching unit of the information processing apparatus includes: the mobile device connected to the in-vehicle device via the wireless LAN and the information processing device when interference of a predetermined level or more with respect to the working channel occurs. In the case where navigation data used for route guidance along the guidance route that is the route to the destination is sent and received, the route guidance of the right and left turn points of the guidance route will not occur within a predetermined period in the future, An information system, wherein the working channel is switched to the empty channel. An information system according to claim 8, 9, 10, 11 or 12,
The information processing apparatus is an information processing apparatus mounted on an automobile. An information system according to claim 8, 9, 10, 11, 12 or 13,
The wireless LAN is an IEEE 802.11 standard wireless LAN. It functions as a wireless LAN access point using a wireless channel set as a working channel for a plurality of other devices, and is read by a computer that communicates with the other devices connected to the wireless LAN via the wireless LAN. A computer program to be executed,
In the computer,
When an interference of a predetermined level or more with respect to the working channel occurs, the other device not communicating with the in-vehicle device among the other devices connected to the in-vehicle device via the wireless LAN, An empty channel detection step of detecting a wireless channel that can be used for communication without interference as an empty channel by investigating the usage status of each wireless channel that can be used for the wireless LAN via the wireless LAN;
A computer program for causing a vacant channel detected in the vacant channel detection step to execute a working channel switching step for switching the working channel. A computer program according to claim 15, comprising:
In the working channel switching step, when interference with a predetermined level or more with respect to the working channel occurs, when communicating with the other device connected to the in-vehicle device via the wireless LAN, A computer program, wherein the working channel is switched to the empty channel at a timing when no significant data is transmitted or received by communication. A computer program according to claim 15, comprising:
In the active channel switching step, when interference of a predetermined level or more with respect to the active channel occurs, the other device connected to the in-vehicle device via the wireless LAN and the music to be stream-played in the information processing device A computer program characterized by switching the active channel to the empty channel at the timing of switching of music to be transmitted and received when continuously transmitting and receiving. A computer program according to claim 15, comprising:
In the active channel switching step, when interference of a predetermined level or more with respect to the active channel occurs, a video that is stream-played in the information processing apparatus and the other apparatus connected to the in-vehicle apparatus via the wireless LAN In the case of transmission / reception, a computer program characterized by switching the working channel to the empty channel at the timing of switching of a video stream or scene to be transmitted / received. A computer program according to claim 15, comprising:
In the active channel switching step, when interference of a predetermined level or more with respect to the active channel occurs, the other device connected to the in-vehicle device via the wireless LAN and the information processing device to the destination When sending and receiving navigation data used for route guidance along the guidance route, which is a route, at the timing when the route guidance of the right and left turn points of the guidance route will not occur within a predetermined period in the future, A computer program for switching the working channel. A computer program according to claim 15, 16, 17, 18 or 19,
The computer program according to claim 1, wherein the wireless LAN is an IEEE 802.11 standard wireless LAN.