JPWO2015045307A1 - Wireless communication apparatus, wireless communication system, and communication method - Google Patents

Abstract

In order to solve the problem that line route switching cannot be performed if a device that centrally controls switching of communication lines (network monitoring device) fails, the wireless communication system of the present invention is connected to a plurality of devices, and at least 1 At least one wireless communication device connected to one of the devices via a wireless line, the wireless communication device obtains prediction information to predict the communication quality of the wireless line, and the communication quality of the wireless line Switch the line before the change.

Description

  The present invention relates to a wireless communication device, a wireless communication system, and a communication method, and more particularly to a wireless communication device, a wireless communication system, and a communication method that perform communication over a line with better quality.

  In general, a wireless communication system includes a wireless communication device connected to a plurality of communication lines, and the wireless communication device is known to perform communication on a line with better communication quality among the connected communication lines. It has been. Patent Documents 1 and 3 below disclose wireless communication systems that perform communication using a line with better communication quality.

  The wireless communication system of Patent Document 1 includes a plurality of microwave wireless communication devices. Each microwave radio communication apparatus is connected in a ring shape so that a radio line and a wired line are alternated. When each microwave radio communication apparatus is communicating via a radio line and detects quality deterioration of the radio line, it updates the path cost value of its own apparatus to a higher value and uses the spanning tree protocol to To make changes. As a result, the wireless communication system disclosed in Patent Document 1 can perform communication using a wired line with better quality than a deteriorated wireless line.

  The wireless communication system of Patent Document 3 includes a plurality of wireless communication devices. Each wireless communication device detects a communication speed for each of the upstream wireless communication and the downstream wireless communication, and determines whether a communication failure has occurred in either the upstream wireless communication or the downstream wireless communication based on the detected communication speed. Each wireless communication device performs adaptive modulation control on wireless communication in which a communication failure has occurred, calculates a new communication speed, and executes STP (Spanning Tree Protocol) path control based on the new communication speed. Switch to a redundant route. As a result, the wireless communication system of Patent Document 1 can maintain the communication capacity.

  However, since the wireless communication systems of Patent Documents 1 and 3 change to another communication line after the communication line has deteriorated, communication is temporarily performed until the change to the other communication line is completed. There was a problem of being interrupted.

  A system that solves the above-described problems is disclosed in Patent Document 2. FIG. 12 is a configuration diagram of a wireless communication system disclosed in Patent Document 2.

  As shown in FIG. 12, the wireless communication system of Patent Literature 2 includes a wireless communication network 100 including a plurality of wireless stations, a network monitoring device 110, and a weather data server 120. The network monitoring apparatus 110 is set in advance with a diagram (hereinafter referred to as “network diagram”) in which radio stations constituting the radio communication network 100 and current line routes are mapped.

  When the weather monitoring data is acquired from the weather data server 120, the network monitoring device 110 uses the weather prediction data and the network diagram to calculate a predicted rainfall amount after a predetermined time on the current line route. Next, the network monitoring apparatus 110 predicts whether or not a line error will occur in the current line route based on the predicted rainfall. If the network monitoring apparatus 110 predicts that a line error will occur in the current line route, the network monitoring device 110 will change from the current line route to another line route (which is predicted to have no line error) before the predetermined time elapses. Is switched to the wireless station of the wireless communication network 100. The radio station performs line switching based on the instruction.

  As described above, the wireless communication system of Patent Document 2 calculates the amount of rainfall after a predetermined time has elapsed in the current line route, and switches the line route in advance when it is predicted that a line error will occur from the expected amount of rainfall. Can be cut off.

JP 2006-245837 A JP 2009-49593 A International Publication No. 2012/091025

  However, in the wireless communication system of Patent Document 2, since the network monitoring device controls the switching of the circuit route, there is a problem that the switching of the circuit route cannot be performed if the network monitoring device fails.

  In addition, the wireless communication system disclosed in Patent Document 2 has a problem in that it is impossible to switch the line route even when the connection between the network monitoring device and the wireless communication network is disconnected. This is because the switching instruction does not reach the wireless station from the network monitoring device.

  Further, the wireless communication system disclosed in Patent Document 2 is a network monitoring device that includes a network diagram including a newly established wireless station so that a line route passing through the newly established wireless station can be switched each time a wireless station is newly established in the wireless communication network. Had to be set to. This is because the wireless communication system of Patent Document 2 performs line route switching based on a network diagram. Each time a new station is installed, the network diagram must be set in the network monitoring device, which is troublesome for system maintainers.

  An object of the present invention is to provide a wireless communication apparatus, a wireless communication system, and a communication method that solve the above-described problems.

  In order to achieve the above object, the wireless communication apparatus of the present invention acquires prediction information to predict the communication quality of a wireless line, and switches the line before the communication quality of the wireless line fluctuates.

  To achieve the above object, a wireless communication system of the present invention includes at least one wireless communication device connected to a plurality of devices and connected to at least one of the devices via a wireless line, and the wireless communication The apparatus obtains prediction information to predict the communication quality of the wireless line, and switches the line before the communication quality of the wireless line changes.

  In order to achieve the above object, the communication method of the present invention obtains prediction information to predict the communication quality of a radio channel, and switches the channel before the communication quality of the radio channel fluctuates.

  According to the present invention, the wireless communication system is configured so that the communication line can be switched and the communication is not interrupted even if the network monitoring device fails or the connection between the network monitoring device and the wireless communication network is disconnected. Can do.

  Furthermore, according to the present invention, it is not necessary for the wireless communication system to set the network diagram in the network monitoring device every time a wireless station is newly installed in the wireless communication network. As a result, the wireless communication system can save time and effort for the system maintainer, specifically, the trouble of setting the network diagram.

It is a figure which shows the structural example of the radio | wireless communication apparatus in the 3rd Embodiment of this invention. It is a figure which shows the structural example of the radio | wireless communications system in the 1st Embodiment of this invention. It is a figure which shows the structural example of the radio | wireless communication apparatus with which the radio | wireless communications system in the 1st Embodiment of this invention is equipped. It is a figure for demonstrating the outline | summary of operation | movement of the radio | wireless communication apparatus with which the radio | wireless communications system in the 1st Embodiment of this invention is equipped. FIG. 6 is a diagram (No. 1) for explaining details of an operation of the wireless communication device provided in the wireless communication system according to the first embodiment of the present invention; FIG. 8 is a diagram (No. 2) for explaining the operation in detail of the radio communication device provided in the radio communication system according to the first embodiment of the present invention. It is the figure which showed the mode (before rain forecast) of the data transfer between the radio | wireless communication apparatuses 10 and 20 with which the radio | wireless communications system in the 1st Embodiment of this invention is equipped. It is the figure which showed the mode (after rain forecast) of the data transfer between the radio | wireless communication apparatuses 10 and 20 with which the radio | wireless communications system in the 1st Embodiment of this invention is equipped. It is a figure which shows the structural example of the radio | wireless communications system in the 2nd Embodiment of this invention. It is a figure which shows the structural example of the radio | wireless communication apparatus with which the radio | wireless communications system in the 2nd Embodiment of this invention is equipped. It is a figure for demonstrating the detail of operation | movement of the radio | wireless communication apparatus with which the radio | wireless communications system in the 2nd Embodiment of this invention is equipped. 1 is a configuration diagram of a wireless communication system of Patent Document 2. FIG.

  Next, embodiments of the present invention will be described in detail with reference to the drawings.

[First Embodiment]
The wireless communication system according to the first embodiment of the present invention includes a plurality of wireless communication devices and a weather prediction server, and each wireless communication device is connected to at least two wireless communication devices via a communication line. The communication line is a wireless line or a wired line. In the wireless communication system of the present embodiment, each wireless communication device calculates an expected rainfall amount after a predetermined time on the wireless line based on data acquired from a weather prediction server, and a path cost corresponding to the calculated predicted rainfall amount. Ask for. Each wireless communication device obtains a larger path cost as the calculated expected rainfall amount increases. Each wireless communication device uses a path cost and a spanning tree protocol to switch a communication line for communication so as to avoid a wireless line that is expected to deteriorate due to rain (a high path cost).

  The configuration and operation of the wireless communication apparatus provided in the wireless communication system and system according to the first embodiment of the present invention will be described below.

[Description of configuration]
(1) Configuration of Radio Communication System in First Embodiment of the Present Invention FIG. 2 is a diagram showing a configuration example of a radio communication system in the first embodiment of the present invention. As shown in FIG. 2, the wireless communication system of the present embodiment includes a plurality of wireless communication devices 10, 20, 30, 40, a weather prediction server 50, and terminals 60, 70.

  Each wireless communication device is connected to at least two wireless communication devices via a communication line. Specifically, the wireless communication device 10 is connected to the wireless communication device 20 via a wireless line, and is connected to the wireless communication device 30 via a wired line. The wireless communication device 40 is connected to the wireless communication device 20 via a wired line, and is connected to the wireless communication device 30 via a wireless line. Note that the number of wireless communication devices provided in the wireless communication system of the present embodiment is not limited to four. As long as there are a plurality of wireless communication apparatuses, any number of wireless communication apparatuses may be included in the wireless communication system of the present embodiment.

  Further, the wireless communication devices 10 and 20 are connected to the terminals 60 and 70 through a wired line. Here, the terminals 60 and 70 are described as being general PCs (Personal Computers), but they may be general network devices such as base stations. Further, the wireless communication devices 10, 20, 30, 40 are connected to the weather prediction server 50. Details of the weather prediction server 50 will be described later in “(3) Weather prediction server 50”.

(2) Configuration of Wireless Communication Device Provided in Wireless Communication System of Present Embodiment The configuration of the wireless communication device provided in the wireless communication system of the present embodiment will be described. FIG. 3 is a diagram illustrating a configuration example of a wireless communication device provided in the wireless communication system according to the first embodiment of the present invention.

  As shown in FIG. 3, the wireless communication devices 10, 20, 30, and 40 include a GPS (Global Positioning System) function unit 1, a position information acquisition unit 2, a weather information acquisition unit 3, a control unit 4, A table storage unit 5, a routing unit 6, a wireless communication unit 7, and a wired communication unit 8 are provided. The wireless communication devices 10, 20, 30, and 40 may include a plurality of wireless communication units 7 and wired communication units 8. Although not shown, the control unit 4 of the wireless communication device 10 is connected to the terminal 60, and the control unit 4 of the wireless communication device 20 is connected to the terminal 70. The weather information acquisition unit 3 of the wireless communication devices 10, 20, 30, 40 is connected to the weather prediction server 50.

  The GPS function unit 1, the wireless communication unit 7, and the wired communication unit 8 can be realized by using an electronic circuit, an FPGA (Field-Programmable Gate Array), and a DSP (Digital Signal Processor).

  The position information acquisition unit 2, the weather information acquisition unit 3, the control unit 4, the table storage unit 5, and the routing unit 6 can be realized by software, and a CPU (Central Processing Unit) and a RAM for operating the software Memory. RAM is an abbreviation for Random Access Memory.

(3) About Table Storage Unit 5 In the table storage unit 5, a table in which the predicted rainfall amount and the path cost are associated with each other is set in advance by the administrator of the wireless communication system of the present embodiment. The predicted rainfall and the path cost in the above table satisfy a monotonically increasing relationship in which the path cost increases as the predicted rainfall increases.

The administrator of the wireless communication system according to the present embodiment sets a table (hereinafter referred to as “proportional table”) in the table storage unit 5 as the above-described table in which the path cost increases in proportion to the predicted rainfall amount. May be. In addition, the administrator of the wireless communication system according to the present embodiment may set a table of expected rainfall and path cost satisfying the following expression 1 in the table storage unit 5.

  x1 and 2 are two arbitrary predicted rainfalls in the table. x2 is greater than x1. y1 and 2 are path costs corresponding to the predicted rainfall amounts x1 and x2.

  The administrator of the wireless communication system of the present embodiment sets a table in which the corresponding path cost is set to a very large value for the amount of rainfall that is expected to prevent radio waves from passing through the opposing wireless communication device 20. Also good.

(4) About the weather prediction server 50 Here, the weather prediction server 50 is demonstrated.

  The weather prediction server 50 is a general weather prediction server, and calculates a predicted rainfall amount at a predetermined location (latitude and longitude) after a predetermined time elapses from that time when a predetermined timing is reached. For example, if the predetermined timing is 11:45 and the predetermined time is 15 minutes, the weather prediction server 50 determines that the predetermined location at 12 o'clock after 15 minutes from 11:45 (for example, point A, B (Estimated point, point C).

  Some of the predetermined locations (latitude and longitude) are locations (latitude and longitude) between the wireless communication device 10 and the wireless communication device 20. The predetermined location (latitude and longitude) is set in the weather prediction server 50 by the administrator of the weather prediction server 50. The administrator of the weather prediction server 50 sets some of the locations (latitude and longitude) between the wireless communication device 10 and the wireless communication device 20 as predetermined locations (latitude and longitude), which are more than a certain distance from each other. It is desirable to be separated.

  The above-mentioned predetermined timing (hereinafter referred to as “reference time”) is a timing at regular intervals, and is set in the weather prediction server 50 by the administrator of the weather prediction server 50.

  Hereinafter, the reference time is a timing every 15 minutes (11:45, 12:00, 12:15...), And the above described predetermined time is 15 minutes. Each time the weather prediction server 50 becomes (11:45, 12:00, 12:15,...), The weather prediction server 50 calculates an expected rainfall amount at a predetermined place after 15 minutes from that point.

  Note that the weather prediction server 50 may be connected to a plurality of weather observation points and calculate the above-described predicted rainfall from the weather information and meso numerical prediction model sent from the plurality of observation points.

  When a predetermined signal is input, the weather prediction server 50 outputs the predicted rainfall amount at the predetermined location calculated most recently as weather prediction data.

[Description of operation]
Next, the operation of the wireless communication system according to the first embodiment of the present invention will be described below with reference to FIGS. First, the operation of each wireless communication device provided in the wireless communication system will be described, and then how the wireless communication system operates as each wireless communication device operates will be described.
(1) Outline of Operations of Each Wireless Communication Device According to this Embodiment First, an outline of operations of each wireless communication device 10, 20, 30, 40 provided in the wireless communication system according to this embodiment will be described below with reference to FIG. To do. FIG. 4 is a diagram for explaining the outline of the operation of the wireless communication device provided in the wireless communication system according to the first embodiment of the present invention. Since the wireless communication devices 10, 20, 30, and 40 perform the same operation, only the wireless communication device 10 will be described as a representative.

(S1)
First, as illustrated in FIG. 4, the wireless communication device 10 stores latitude and longitude measured by its own GPS (Global Positioning System) function as position information of its own device after activation.

(S2)
Next, the wireless communication device 10 acquires the position information of the wireless communication device 20 facing through the wireless line from the wireless communication device 20 and stores it as the position information of the facing device.

  Details of a specific method for acquiring position information of the wireless communication device 20 will be described in “(2-2) Realization of S2” described later.

(S3)
Next, the wireless communication device 10 determines whether or not the current time is a predetermined timing.

  The predetermined timing is a timing at regular intervals, and is set in the wireless communication device 10 by the administrator of the wireless communication system of the present embodiment. Hereinafter, the predetermined timing is the timing (for example, 11:46, 12:00) immediately after the reference time (for example, 11:45, 12:00, 12:15, etc.) at which the weather prediction server 50 calculates the predicted rainfall amount. 1 minute, 12:16, etc.). The description will be continued assuming that the current time is 11:46.

(S4)
Next, when the current time is a predetermined timing (11:46) (Yes in S3), the wireless communication device 10 acquires weather prediction data from the weather prediction server 50.

  At this time, the weather forecast data to be acquired is the weather forecast data calculated by the weather forecast server 50 at the latest reference time (11:45), as described above in “(4) About the weather forecast server 50”. . That is, the wireless communication device 10 indicates the expected rainfall amount at a predetermined place (for example, point A, point B, point C) at 12:00 after a predetermined time (15 minutes) has elapsed since the reference time 11:45. Get weather forecast data. Note that some of the predetermined locations described above are locations located between the wireless communication devices 20 facing each other.

(No in S3)
In addition, when the present time is not a predetermined timing (in the case of No in S3), the wireless communication device 10 repeatedly executes the above-described S3 until the predetermined timing is reached.

(S5)
After the above-described S4, the wireless communication device 10 determines the amount of rainfall expected between the device itself and the wireless communication device 20 after a predetermined time of 15 minutes (ie, 12:00) from the reference time of 11:45, It calculates using the positional information acquired by S1-S2 and the above-mentioned weather prediction data. Next, the wireless communication device 10 obtains a path cost corresponding to the calculated predicted rainfall. At this time, the wireless communication device 10 obtains a larger path cost as the predicted rainfall amount increases. The wireless communication apparatus 10 may obtain a path cost having a value proportional to the expected rainfall (hereinafter referred to as “proportional path cost”), or may obtain a path cost having a value larger than the proportional path cost. Details of how to determine the path cost will be described later in “(2-5) Realization of S5 described above”.

  When the wireless communication device 10 determines the path cost, the wireless communication device 10 sets the calculated path cost as the path cost of the wireless line between the wireless communication device 20 and the wireless communication device 20.

  Note that details of a specific method for calculating the above-described predicted rainfall will be described in “(2-5) Realization of S5” described later. Further, the path cost of the wired line with the wireless communication device 30 is set in the wireless communication device 10 in advance by the administrator of the wireless communication system of the present embodiment.

(S6)
Next, the wireless communication apparatus 10 determines a line for communication using a known spanning tree protocol (hereinafter referred to as “STP”) based on the obtained path cost of each line, and switches to that line.

Details of a method for determining a communication line will be described later in “(2-6) Realization of S6 described above”. STP is defined in IEEE (Institute of Electrical and Electronic Engineers) 802.1d.
(2) Detailed operation of each wireless communication device of this embodiment Next, the operation of the functional units provided in each wireless communication device will be described below with reference to FIGS. Each functional unit included in the wireless communication apparatus realizes the above-described S1 to S6. Since the wireless communication device 10 and the wireless communication devices 20, 30, and 40 perform the same operation, the operation of each part provided in the wireless communication device 10 will be described as a representative.

  FIG. 5 is a view (No. 1) for explaining details of the operation of the wireless communication apparatus included in the wireless communication system according to the first embodiment of the present invention. FIG. 6 is a diagram (No. 2) for explaining details of the operation of the wireless communication apparatus included in the wireless communication system according to the first embodiment of the present invention.

(2-1) Realization of S1 described above (S10)
First, the control unit 4 of the wireless communication device 10 realizes the above-described S1, as shown in FIG. 5, after starting, a signal requesting measurement of location information of the current location (hereinafter referred to as “information request signal”). ) Is output to the GPS function unit 1.

(S11)
Next, when the information request signal is input, the GPS function unit 1 of the wireless communication device 10 measures the latitude and longitude of the current location by the GPS function provided in itself, and outputs the measured latitude and longitude to the control unit 4. .

(S12)
Next, the control unit 4 of the wireless communication device 10 stores the input latitude and longitude in a memory provided therein as position information of the device itself.

(2-2) Realization of S2 described above (S13)
Next, the control unit 4 of the wireless communication device 10 requests the position information acquisition unit 2 to acquire the position information of the opposite device in order to realize the above-described S2.

(S14)
Next, when the position information acquisition unit 2 of the wireless communication device 10 is requested by the control unit 4 to acquire the position information of the opposite device, a value corresponding to the request (hereinafter referred to as “acquisition request value”) is obtained. Output to the wireless communication unit 7.

(S15)
Next, when the acquisition request value is input, the wireless communication unit 7 of the wireless communication device 10 outputs the value to the opposite wireless communication device 20 as a wireless signal. Thereafter, when a wireless signal is input from the wireless communication device 20, the wireless communication unit 7 of the wireless communication device 10 extracts position information of the wireless communication device 20 from the wireless signal.

  Conversely, when the wireless communication unit 7 of the wireless communication device 20 outputs an acquisition request value as a wireless signal to the opposite wireless communication device 10, each part of the wireless communication device 10 has the following ( It operates as I)-(III).

  (I) When the wireless communication unit 7 of the wireless communication device 10 extracts the acquisition request value from the wireless signal input from the wireless communication device 20, the wireless communication unit 7 outputs the extracted acquisition request value to the control unit 4.

  (II) When the acquisition request value is input, the control unit 4 of the wireless communication device 10 outputs the position information (latitude and longitude) of the own device acquired in S12 described above to the wireless communication unit 7.

  (III) The wireless communication unit of the wireless communication device 10 outputs the input position information (latitude and longitude) of the device itself to the wireless communication device 20 as a wireless signal.

(S16)
Next, when the position information of the facing wireless communication device 20 is extracted in S15 described above, the wireless communication unit 7 of the wireless communication device 10 outputs the extracted position information of the wireless communication device 20 to the position information acquisition unit 2. To do.

(S17)
Next, the position information acquisition unit 2 of the wireless communication device 10 outputs the input position information (latitude and longitude) of the wireless communication device 20 to the control unit 4 of the wireless communication device 10.

(S18)
Next, the control unit 4 of the wireless communication device 10 stores the input position information (latitude and longitude) of the facing wireless communication device 20 in a memory provided therein.

(2-3) Realization of S3 described above (S19)
Next, the control unit 4 of the wireless communication device 10 obtains the current time by using a clocking function provided in itself, and determines whether or not the current time is a predetermined timing.

  The predetermined timing described above is assumed to be the timing immediately after the reference time (11:45, 12:12, 12:15) (that is, 11:46, 12: 1, 12:16). Give an explanation.

(No in S19)
When it is determined in S19 that the current time is not the predetermined timing (No in S19), the control unit 4 of the wireless communication device 10 repeatedly executes the above S19 until the next predetermined timing is reached. To do.

(2-4) Realization of S4 described above The following description will be made assuming that the current time is 11:46.

(S20)
In S19, when it is determined that the current time is a predetermined timing (11:46) (Yes in S19), the control unit 4 of the wireless communication device 10 instructs the weather information acquisition unit 3 to To request weather forecast data.

(S21)
Next, when the weather information acquisition unit 3 of the wireless communication device 10 is requested to acquire weather prediction data from the control unit 4, the weather information acquisition unit 3 outputs a predetermined signal to the weather prediction server 50, and the weather prediction server 50 outputs the weather prediction data. To get. The weather information acquisition unit 3 of the wireless communication device 10 outputs the acquired weather prediction data to the control unit 4.

  The acquired weather prediction data is the weather prediction data calculated by the weather prediction server 50 at the latest reference time (11:45) as described in S4 above. That is, the acquired weather forecast data includes the predicted rainfall at a predetermined place (for example, point A, point B, point C) at 12:00 after a predetermined time has elapsed from the latest reference time (11:45). It is shown. Some of the predetermined locations are locations located between the wireless communication devices 20 facing each other. The forecasted rainfall at 12 o'clock after the elapse of a predetermined time from the latest reference time (11:45) is associated with the weather forecast data for each latitude and longitude indicating the predetermined location. The weather forecast data also includes a value indicating the predetermined time.

(2-5) Realization of S5 described above (S22)
Next, when the weather forecast data is input, the control unit 4 of the wireless communication device 10 receives the reference time 11 from the wireless communication device 20 that performs communication via a wireless line as shown in FIG. The estimated rainfall at 12:00 after a predetermined time from 45 minutes is obtained. The control unit 4 of the wireless communication apparatus 10 obtains the above-described predicted rainfall using the position information stored in the above-described S12 and S18 and the input weather prediction data.

  Specifically, the control unit 4 of the wireless communication device 10 obtains the above-described predicted rainfall amount as described in (I) to (III) below.

  (I) The control unit 4 of the wireless communication device 10 stores the longitude / latitude of its own device stored in S12 (hereinafter referred to as “position A”) and the latitude / longitude of the wireless communication device 20 stored in S18 (hereinafter referred to as “ Read position B).

  (II) Next, the control unit 4 of the wireless communication apparatus 10 determines a predetermined location (latitude / longitude) between the position A and the position B among the predetermined locations (latitude / longitude) indicated by the input weather prediction data. Are all extracted. In other words, the control unit 4 of the wireless communication device 10 extracts all the latitudes and longitudes of some locations up to the wireless communication device 20.

  (III) Further, the control unit 4 of the wireless communication device 10 extracts the predicted rainfall associated with the latitude and longitude of the extracted location from the weather prediction data, and obtains the largest predicted rainfall among them. That is, the control unit 4 of the wireless communication device 10 obtains the largest expected rainfall amount at several locations up to the wireless communication device 20. The control unit 4 of the wireless communication device 10 sets the calculated maximum predicted rainfall amount as the predicted rainfall amount at 12:00 between the own device and the wireless communication device 20 after a predetermined time from the reference time 11:45. .

(S23)
Next, the control unit 4 of the wireless communication apparatus 10 stores the estimated rainfall amount at 12:00 after a predetermined time has elapsed from the reference time 11:45 obtained in S22 in the table storage unit 5 as shown in FIG. Output.

(S24)
Next, the table storage unit 5 of the wireless communication device 10 obtains a path cost corresponding to the predicted rainfall input from the control unit 4.

  Specifically, the table storage unit 5 of the wireless communication device 10 obtains a path cost corresponding to the predicted rainfall input from the control unit 4 from a table set in itself.

  The above-described table is a table in which the predicted rainfall amount and the path cost are associated with each other as described in “(3) About the table storage unit 5”. The larger the expected rainfall, the higher the path cost is associated.

(S25)
Next, as shown in FIG. 6, the table storage unit 5 of the wireless communication apparatus 10 outputs the path cost obtained in S <b> 24 described above to the control unit 4.

(2-6) Realization of S6 described above (S26)
Next, the control unit 4 of the wireless communication device 10 realizes the above-described S6, and when the path cost is input, the control unit 4 communicates with the wireless communication device 30 as the path cost of the wireless line with the wireless communication device 20. Output to the routing unit 6 together with the path cost of the wired line between them.

  Note that the path cost of the wired line with the wireless communication device 30 is preset in the control unit 4 by the user of the wireless communication system of the present embodiment.

(S27)
Next, when the path cost of each communication line is input, the routing unit 6 of the wireless communication device 10 regards the wireless communication unit 7 and the wired communication unit 8 as ports, and uses the path cost and a well-known STP for each port. The port state, that is, the forwarding state or the blocking state is determined.

  STP is an abbreviation for Spanning Tree Protocol.

(S28)
Next, the routing unit 6 of the wireless communication apparatus 10 outputs the determined port states of the wireless communication unit 7 and the wired communication unit 8 to the control unit 4.

(S29)
Next, when the port state of each communication unit is input, the control unit 4 of the wireless communication apparatus 10 determines the communication unit in the forwarding state as a communication unit that performs communication, and performs communication using the communication unit. When there are a plurality of communication units in the forwarding state, the control unit 4 of the wireless communication apparatus 10 determines all of them as communication units that perform communication.

  Determining a communication unit that performs communication and performing communication in the communication unit is to determine a communication line (because a communication line is connected to each communication unit) and switch to the communication line. Therefore, in FIG. 6, “line determination / switching” is described.

  Note that the control unit 4 of the wireless communication device 10 determines a communication unit that performs communication before the communication quality of the wireless line deteriorates, that is, before a predetermined time elapses. For this purpose, the control unit 4 of the wireless communication device 10 measures the time between S22 and S28 with the time counting function provided in itself, and if the time is sufficiently shorter than the predetermined time included in the weather forecast data, You may implement above-mentioned S29.

(Operation after S29)
After the above-described S29, the control unit 4 of the wireless communication apparatus 10 returns to the above-described S19 and waits for a predetermined timing (12: 1) to operate next. The control unit 4 performs S19 to S29 again at the next predetermined timing (12: 1). In this case, “11:46” described in S19 to S29 is “12: 1”. Further, “11:45” described in S19 to S29 is “12 o'clock”, and “12 o'clock” is “12:15”.

(3) Description of operation as a wireless communication system Next, how the wireless communication system operates when each wireless communication device performs the above-described S10 to S29 will be described with reference to FIGS. . The explanation will be given separately when the rainfall is not expected and when it is expected.

  The wireless communication device 20 is set with the smallest MAC (Media Access Control) address, and the wireless communication devices 10, 30, and 40 have larger MAC addresses in the order of the wireless communication devices 20, 10, 30, and 40. Suppose that it is set. In addition, the bridge priority values of the wireless communication devices are all equal. Further, it is assumed that the wireless communication devices 10, 20, 30, and 40 are set with tables in which the path cost is A when the predicted rainfall is 0 and the path cost is B when the predicted rainfall is Z. . In addition, it is assumed that A is set as the path cost of the wired line in the wireless communication devices 10, 20, 30, and 40. A, B, and Z described above are positive numerical values other than zero. However, B is sufficiently larger than A to satisfy the above-described formula 1.

(3-1) Operation of Wireless Communication System When Rain is Not Expected First, the weather prediction server 50 is at the reference time (11:45), and the expected rainfall amount at each predetermined location is 0 (no rain) ) Is calculated. The above-described expected rainfall is the estimated rainfall at 12:00 (after a predetermined time of 15 minutes has elapsed from the reference time of 11:45).

(3-1-1) Results when performing the above-described S10 to S29 when no rain is expected When each of the functional units of the wireless communication devices 10, 20, 30, and 40 performs the above-described S10 to S25, Since the expected rainfall is 0, as shown in FIG. 7, the path cost A is calculated as the path cost of the wireless line. Thereafter, each functional unit of the wireless communication devices 10, 20, and 30 performs the above-described S26 to S28, and determines that each communication unit is in a forwarding state based on the path cost of each communication line and a well-known STP. In addition, the control unit 4 of the wireless communication devices 10, 20, and 30 performs the above-described S29, and determines each wireless communication unit 7 and the wired communication unit 8 that are in the forwarding state as communication units that perform communication. On the other hand, when each functional unit of the wireless communication device 40 performs the above-described S26 to S28, the wireless communication unit 7 is in the blocking state and the other communication units are in the forwarding state due to the path cost of each communication line and the known STP. Ask for it. Thereafter, the wireless communication device 40 (the control unit 4 thereof) performs the above-described S29, and determines the wired communication unit that is in the forwarding state as a communication unit that performs communication. The control unit 4 of the wireless communication device 40 does not determine the wireless communication unit in the blocking state as a communication unit that performs communication.

(3-1-2) Communication operation of wireless communication system when rain is not expected (S100)
As described above, after each wireless communication device 10, 20, 30, 40 determines a communication unit to perform communication, data is transmitted from the terminal 60 to the control unit 4 of the wireless communication device 10 as illustrated in FIG. 7. Suppose that it is input. The input data is packet data addressed to the terminal 70. That is, the input data includes the IP (Internet Protocol) address of the terminal 70.

(S101)
When the packet data addressed to the terminal 70 is input from the terminal 60, the control unit 4 of the wireless communication apparatus 10 outputs the packet data to the communication unit that performs communication, that is, the wireless communication unit 7 and the wired communication unit 8.

(S102)
Next, the wireless communication unit 7 of the wireless communication device 10 outputs the input packet data addressed to the terminal 70 to the wireless communication device 20 as a wireless signal.

(S103)
Next, when the wireless communication device 20 extracts the packet data from the input wireless signal, the wireless communication device 20 determines whether the packet is addressed to the terminal 70 connected to the wireless communication device 20. Output to.

  Specifically, each wireless communication device 20 performs processing as described in (I) to (III) below.

  (I) The wireless communication unit 7 of the wireless communication device 20 extracts packet data from the input wireless signal and outputs the packet data to the control unit 4.

  (II) When the packet data is input from the wireless communication unit 7, the control unit 4 of the wireless communication device 20 determines whether the packet data is addressed to the terminal 70 connected to itself. Specifically, the IP address of the terminal 70 is set in advance in the control unit 4 of the wireless communication device 20, and the control unit 4 of the wireless communication device 20 determines that the set IP address of the terminal 70 is packet data. To determine whether it is included. The administrator of the wireless communication system according to the present embodiment sets the IP address of the terminal 70 in the control unit 4 of the wireless communication device 20.

  (III) When the control unit 4 of the wireless communication device 20 determines that the packet data is addressed to the terminal 70, the control unit 4 outputs the packet data to the terminal 70.

  Here, since the input packet data is the packet data addressed to the terminal 70, the control unit 4 of the wireless communication apparatus 20 continues the description assuming that the input packet data is output to the terminal 70.

  If the control unit 4 of the wireless communication device 20 determines that the packet data is not addressed to the terminal 70, the control unit 4 outputs the packet data to the wired communication unit 8 that is a communication unit that performs communication. The wireless communication unit 7 is also a communication unit that performs communication, but the control unit 4 of the wireless communication apparatus does not return the data to the communication unit that has input the data.

(S104)
The terminal 70 receives the packet data and displays it on a screen provided for itself.

  As described above in S100 to S104, the packet data addressed to the terminal 70 is transmitted to the terminal 70 via the wireless line between the wireless communication device 10 and the wireless communication device 20.

(S105)
In S101 described above, the packet data addressed to the terminal 70 input to the wired communication unit 8 of the wireless communication device 10 is output from the wired communication unit 8 to the wireless communication device 30 as an electrical signal. It reaches the wireless communication device 40 via the communication unit or the control unit. However, since the wireless communication unit 7 of the wireless communication device 40 is in the blocking state, it does not receive packet data addressed to the terminal 70. As a result, the packet data addressed to the terminal 70 input to the wired communication unit 8 of the wireless communication device 10 does not reach the terminal 70 via the wireless communication device 20. Note that the STP always puts one of the wireless communication unit 7 and the wired communication unit 8 of the wireless communication devices 10, 20, 30, and 40 in a blocking state. Since any one of the wireless communication units 7 and the wired communication unit 8 is blocked, the terminal 70 does not receive a plurality of packet data addressed to itself.

  The packet data addressed to the terminal 70 reaches the terminal 70 via the wireless line as described above in S100 to S104.

(3-2) Operation of Wireless Communication System When Rain is Expected (3-2-1) Results of Performing S19 to S29 when Rain is Expected Next, each wireless communication device 10 , 20, 30 and 40, when the next predetermined timing (12:01) is reached, the above-described S19 to S21 are performed again, and the weather prediction data is acquired from the weather prediction server 50. At this time, the wireless communication devices 10, 20, 30, and 40 are located at any location (latitude and longitude) between the wireless communication devices 10 and 20, after a predetermined time has elapsed since the reference time 12:00, that is, at 12:15. It is assumed that the weather forecast data that is expected to rain with the rainfall amount Z is acquired.

  And each radio | wireless communication apparatus 10, 20, 30, 40 will calculate the path cost B as FIG. 8 shows as a path | pass cost of the radio | wireless line between the radio | wireless communication apparatuses 10 and 20, if S22-S25 is implemented. To do. The path cost B is sufficiently larger than the path cost A when there is no rain. Thereafter, the wireless communication device 10 performs the above-described S26 to S29, and obtains that the wireless communication unit 7 is in the blocking state and the wired communication unit 8 is in the forwarding state based on the path cost of each communication line and the known STP. The wireless communication device 10 does not determine the wireless communication unit 7 in the blocking state as a communication unit that performs communication.

  Note that, when performing the above-described S26 to S29, the wireless communication devices 20, 30, and 40 determine that each communication unit is in a forwarding state based on the path cost of each communication line and a well-known STP. The wireless communication devices 20, 30, and 40 determine the wireless communication units 7 and the wired communication units 8 included in the wireless communication devices 20, 30, and 40 as communication units that perform communication.

(3-2-2) Communication operation of wireless communication system when rainfall is expected (S110)
Assume that packet data addressed to the terminal 70 is input from the terminal 60 to the control unit 4 of the wireless communication apparatus 10 after determining the communication unit that performs communication as described above, as illustrated in FIG. 8.

(S111)
When the packet data addressed to the terminal 70 is input from the terminal 60, the control unit 4 of the wireless communication apparatus 10 outputs the packet data to the wired communication unit 8 that is a communication unit that performs communication.

  That is, the wireless communication device 10 switches the communication unit that performs communication from both the wireless communication unit 7 and the wired communication unit 8 to only the wired communication unit 8. Furthermore, the wireless communication device 10 switches a communication line from a wireless line and a wired line to a wired line.

(S112)
The wired communication unit 8 of the wireless communication device 10 outputs the input packet data addressed to the terminal 70 to the wireless communication device 30 as an electrical signal.

(S113)
The wired communication unit 8 of the wireless communication device 30 extracts packet data from the electrical signal and outputs the packet data to the control unit 4 of the wireless communication device 30. Here, when the packet data is input from the wireless communication unit 7 or the wired communication unit 8, the control unit 4 of the wireless communication device 30 determines whether the packet data is addressed to a terminal connected to itself. However, no terminal is connected to the control unit 4 of the wireless communication device 30. In this case, since the IP address of the terminal is not set, the control unit 4 of the wireless communication device 30 does not determine whether the packet is addressed to the terminal connected to itself, and is a wireless communication unit that performs communication. The extracted packet data is output to the wireless communication unit 7 of the communication device 30.

(S114)
Next, the wireless communication unit 7 of the wireless communication device 30 outputs the input packet data addressed to the terminal 70 to the wireless communication device 40 as a wireless signal.

(S115)
Next, the wireless communication unit 7 of the wireless communication device 40 extracts packet data from the wireless signal and outputs the packet data to the control unit 4 of the wireless communication device 40. Here, the control unit 4 of the wireless communication device 40 has no connected terminal, and the IP address of the terminal is not set by the user of the wireless communication system of the present embodiment. Therefore, the control unit 4 of the wireless communication device 40 does not determine whether the packet data is addressed to the connected terminal, but outputs the extracted packet data to the wired communication unit 8 that is a communication unit that performs communication.

(S116)
The wired communication unit of the wireless communication device 40 outputs the input packet data addressed to the terminal 70 to the wired communication unit 8 of the wireless communication device 20 as an electrical signal.

(S117)
The wired communication unit 8 of the wireless communication device 20 extracts packet data from the electrical signal and outputs the packet data to the control unit 4 of the wireless communication device 20. Here, the IP address of the connected terminal 70 is set in the control unit 4 of the wireless communication apparatus 20. Therefore, the control unit 4 of the wireless communication apparatus 20 determines whether the packet data is addressed to the connected terminal 70 as in S103 described above, and outputs the packet data to the terminal 70.

(S118)
The terminal 70 receives the packet data from the wireless communication device 20 and displays the received packet on a screen provided for itself.

  As described above in S110 to S118, when it is expected that the wireless line between the wireless communication devices 10 and 20 is deteriorated, the wireless communication device 10 switches the output communication unit before that, and the packet data addressed to the terminal 70 is It reaches the terminal 70 via the wireless communication devices 30, 40 and 20. That is, the wireless communication system according to the present embodiment avoids a wireless line that is expected to be deteriorated due to rain in advance, and communicates with another line so that the communication is not interrupted. it can.

  Further, unlike the communication system of Patent Document 2, the wireless communication system in this embodiment does not require an instruction to switch the line from the network monitoring apparatus because the wireless communication apparatus itself switches the line, and the network monitoring apparatus fails. Even communication is not interrupted.

[Description of effects]
According to the present embodiment, the wireless line communication system can switch the communication line so that the communication is not interrupted even if the network monitoring device fails or the connection between the network monitoring device and the wireless communication network is disconnected. be able to.

  The reason for this is that each wireless communication device itself provided in the wireless communication system of the present embodiment itself changes the communication line to another line (that is, the state) according to a predetermined state change (for example, rainfall) with the opposite device. This is because switching to a line other than a line that is expected to deteriorate due to a change is made in advance.

  In addition, according to this embodiment, every time a wireless communication device is newly installed in the wireless communication network, the wireless communication system performs setting for switching the communication line to the network monitoring device, specifically, setting of the network diagram. It can be unnecessary. This is because each wireless communication device itself provided in the wireless line communication system of the present embodiment switches the communication line regardless of the network monitoring device. As a result, the wireless communication system according to the present embodiment can save the labor required for the system maintainer, specifically, the trouble of setting the network diagram.

[Second Embodiment]
Next, a second embodiment of the present invention will be described. Wireless links can be degraded not only by rainfall, but also by snowfall, increased particles in the air, and even passing trains. The wireless communication apparatus provided in the wireless communication system according to the second embodiment of the present invention includes an amount of rainfall, a snowfall amount, and an amount of particles in the air that are expected to occur after a predetermined time elapses from a reference time on a wireless line. The path cost corresponding to the presence or absence of passing the train is calculated. Thereafter, the wireless communication apparatus according to the second embodiment of the present invention switches a communication function unit that performs communication using a known spanning tree protocol based on the largest path cost among the calculated path costs. As a result, the wireless communication apparatus according to the second embodiment of the present invention can more reliably avoid a wireless line that is expected to deteriorate and prevent communication from being interrupted.

[Description of configuration]
FIG. 9 is a diagram illustrating a configuration example of a wireless communication system according to the second embodiment of the present invention. FIG. 10 is a diagram illustrating a configuration example of a wireless communication device provided in the wireless communication system according to the second embodiment of the present invention.

  As shown in FIG. 9, the wireless communication system according to the second embodiment includes wireless communication devices 210, 220, 230, and 240 instead of the wireless communication devices 10, 20, 30, and 40. The wireless communication system according to the second embodiment includes a weather prediction server 250 instead of the weather prediction server 50.

  Further, as shown in FIG. 10, the wireless communication devices 210, 220, 230, and 240 acquire weather information instead of the weather information acquisition unit 3, the control unit 4, the table storage unit 5, and the routing unit 6. Unit 203, control unit 204, table storage unit 205, and routing unit 206.

  Since the configuration other than that described above is the same as that of the wireless communication system according to the first embodiment, the same reference numerals are given and description thereof is omitted.

[Description of operation]
(1) About the weather prediction server 250 First, the weather prediction server 250 is demonstrated.

  The weather prediction server 250 is a general weather prediction server, and at a predetermined timing, at a predetermined location (latitude and longitude), the amount of rainfall, snowfall, and air expected after a predetermined time has elapsed from the reference time. Calculate the amount of particles in it. The amount of particles in the air may be the amount of mist or fine particles that cause air pollution. Further, the weather prediction server 250 sets the traffic volume of the vehicle by the administrator of the weather prediction server 250 such as the presence or absence of a train that is expected to pass after a predetermined time has elapsed from the reference time at a predetermined location (latitude and longitude). Is done. The amount of rainfall, amount of snowfall, amount of particles in the air, and traffic volume that are expected after the above-described predetermined time have elapsed are hereinafter referred to as “expected state change amount”.

  When a predetermined signal is input, the weather prediction server 250 associates the predetermined location (latitude and longitude) with the predicted state change amount at the location, and outputs it as state change prediction data.

  The predetermined location (latitude and longitude) includes several locations on the wireless line, that is, some locations (latitude and longitude) between the wireless communication device 210 and the wireless communication device 220. That is, the weather prediction server 250 outputs the predicted state change amount in some places (latitude and longitude) between the wireless communication device 210 and the wireless communication device 220 in the weather prediction data. The state change prediction data includes a value indicating a predetermined time.

  The weather prediction server 250 is connected to a plurality of meteorological observation points, and the amount of rainfall and snowfall predicted after a lapse of a predetermined time at a predetermined location from meteorological information and a numerical prediction model sent from the plurality of observation points. The amount of particles may be calculated.

(2) Description of Operation of Radio Communication Device Provided in Radio Communication System of Present Embodiment FIG. 11 is a diagram for explaining details of the operation of the radio communication device provided in the radio communication system of the second embodiment of the present invention. FIG. The operation of the wireless communication devices 210, 220, 230, and 240 in this embodiment will be described using FIG. Since the wireless communication devices 210, 220, 230, and 240 perform the same operation, the wireless communication device 210 will be described as a representative.

(S220)
First, as illustrated in FIG. 11, the control unit 204 of the wireless communication apparatus 210 performs state change prediction data for the weather information acquisition unit 203 when the current time is a predetermined timing (Yes in S19). Request acquisition.

(S221)
Next, when the weather information acquisition unit 203 of the wireless communication apparatus 210 is requested to acquire the state change prediction data from the control unit 204, the weather information acquisition unit 203 outputs a predetermined signal to the weather prediction server 250, and the state change from the weather prediction server 250. Get prediction data. The weather information acquisition unit 203 of the wireless communication apparatus 210 outputs the acquired state change prediction data to the control unit 204.

  Note that the acquired state change prediction data includes predicted state change amounts at several locations (latitude and longitude) between the wireless communication device 210 and the wireless communication device 220. As described above in “(1) Weather prediction server 250”, the predicted state change amount is the amount of rainfall, snowfall, airborne particles, and vehicle traffic predicted after a predetermined time has elapsed since the reference time. It is.

(S222)
Next, when the state change prediction data is input, the control unit 204 of the wireless communication apparatus 210 uses the position information stored in S12 and S18 described above and the input state change prediction data, and The amount of expected state change after the elapse of a predetermined time is obtained.

  Specifically, the control unit 204 of the wireless communication apparatus 10 performs the processes (I) to (IV) below.

  (I) The control unit 204 of the wireless communication device 210 is opposed to the longitude / latitude (hereinafter referred to as “position A”) of the device stored in S12 from the memory provided in the wireless communication device 210 via the wireless line stored in S18. The latitude / longitude (hereinafter referred to as “position B”) of the wireless communication device 220 is read out.

  (II) Next, the control unit 204 of the wireless communication apparatus 210 determines all predetermined locations (latitude / longitude) between the positions A and B among the predetermined locations (latitude / longitude) indicated by the state change prediction data. Extract.

  (III) Next, the control unit 204 of the wireless communication apparatus 210 estimates the amount of rainfall, the amount of snowfall, and the amount of particles that are associated with the extracted predetermined location (latitude / longitude) and are expected after a predetermined time from the reference time. Are extracted from the state change prediction data. The control unit 204 of the wireless communication apparatus 210 obtains the largest extracted amount for each extracted rainfall amount, snowfall amount, and particle amount. The control unit 204 of the wireless communication device 210 uses the extracted maximum rainfall amount, snowfall amount, and particle amount to estimate the amount of rainfall, snowfall amount, and particle amount that is expected after a predetermined time from the reference time with the wireless communication device 20. And

  (IV) Further, the control unit 204 of the wireless communication apparatus 210 extracts the traffic volume that is associated with the extracted predetermined location (latitude / longitude) and is predicted after a predetermined time from the reference time from the state change prediction data. To do. The control unit 4 of the wireless communication device 10 sets the largest traffic volume in the extracted predicted traffic volume as the traffic volume expected after a predetermined time from the reference time with the radio communication device 20.

(S223)
Next, as illustrated in FIG. 11, the control unit 204 of the wireless communication apparatus 210 outputs the rainfall amount, the snowfall amount, the particle amount, and the traffic volume obtained in S <b> 222 to the table storage unit 205.

  Here, the table storage unit 205 of the wireless communication apparatus 210 includes a table in which path costs are associated with each amount of rainfall, snowfall, particles, and traffic by the administrator of the wireless communication system of the present embodiment. Is set.

  Specifically, a table in which the rainfall amount and the path cost are associated with each other is set in the table storage unit 205 by the administrator of the wireless communication system. Further, in the table storage unit 205, a table in which the snowfall amount and the path cost are associated is set by the administrator of the wireless communication system. In the table storage unit 205, a table in which the particle amount and the path cost are associated is set by the administrator of the wireless communication system. In the table storage unit 205, a table in which traffic volume and path cost are associated with each other is set by the administrator of the wireless communication system.

Each of the above-mentioned tables is a table that satisfies a monotonically increasing relationship in which the path cost also increases when the expected rainfall, snowfall, particle amount, and traffic volume are large. Each of the above-described tables may be a table (hereinafter referred to as “proportional table”) in which the path cost increases in proportion to the predicted amount of rainfall, amount of snowfall, particle amount, and traffic volume. Further, each table described above may be a table that satisfies the above-described Expression 1. (In this case, x1 and x2 in Equation 1 are any two of the expected rainfall, any two of the expected snowfall, any two of the expected particles, and any of the expected traffic. One of the two)
(S224)
As shown in FIG. 11, the table storage unit 205 of the wireless communication apparatus 210 receives the amount of rainfall, the amount of snow, the amount of traffic, and the amount of rainfall when the amount of rainfall, the amount of snow, the amount of particles, and the amount of traffic expected after a predetermined time has elapsed. For each particle amount and traffic volume, the corresponding path cost is obtained from each table described above. Further, the table storage unit 205 of the wireless communication apparatus 210 obtains the maximum path cost among the obtained path costs.

(S225)
Next, the table storage unit 205 of the wireless communication apparatus 210 outputs the determined maximum path cost to the control unit 204.

(Operation after S225)
Next, when the path cost is input, the control unit 204 of the wireless communication apparatus 210 performs S26 to S29 as in the operation of the first embodiment, and performs communication using the path cost and the spanning tree protocol. The communication function unit to be performed, that is, the communication line is switched.

  In the above-described S220 to S225, the wireless communication apparatus 210 calculates the path cost from all of the rainfall amount, the snowfall amount, the particle amount, and the traffic amount. Of the rainfall amount, the snowfall amount, the particle amount, and the traffic amount, The path cost may be calculated from at least one of the following. In that case, the control unit 204 of the wireless communication apparatus 210 outputs at least one of the rainfall amount, the snowfall amount, the particle amount, and the traffic amount to the table storage unit 205 in the above-described S223. Thereafter, the table storage unit 205 obtains a path cost corresponding to the input in S224 and S225 described above, and outputs the maximum path cost among them to the control unit 204.

  Since other operations are the same as those in the first embodiment, detailed description thereof is omitted.

[Description of effects]
According to the present embodiment, the wireless communication system can more reliably avoid a deteriorated wireless line and prevent interruption of communication.

  The reason for this is that the wireless communication device of the present embodiment obtains the path cost corresponding to the amount of snow, the amount of particles, the traffic volume of trains, etc. that are expected to occur after a predetermined time on the wireless line, in addition to rainfall. This is because the line is switched based on these path costs.

[Third Embodiment]
Next, a third embodiment of the present invention will be described.

[Description of configuration]
FIG. 1 is a diagram illustrating a configuration example of a wireless communication system according to a third embodiment of the present invention.

  The wireless communication system in the third embodiment includes at least one wireless communication device 300 as shown in FIG. The wireless communication device 300 is connected to a plurality of devices 310 and 320, and is connected to at least one of them, for example, the wireless communication device 310 via the wireless line 31. The wireless communication device 300 may be connected to the wireless communication device 320 via a wired line 32. Further, the wireless communication device 310 and the wireless communication device 320 may be connected via the wired line 33.

  The wireless communication device 300 acquires the prediction information, predicts the communication quality of the wireless line 31, and switches the line before the communication quality of the wireless line 31 fluctuates.

[Description of operation]
First, it is assumed that the wireless communication device 300 is communicating with the wireless communication device 310 via the wireless line 31. In addition, it is assumed that the wireless communication device 320 communicates with the wireless communication device 310 via the wired line 33.

  Next, the wireless communication device 300 acquires the prediction information, predicts the communication quality of the wireless line 31, and switches the line before the communication quality of the wireless line 31 fluctuates.

  For example, the wireless communication device 300 acquires information indicating that rainfall is predicted after a predetermined time has elapsed with the wireless communication device 310 to predict the communication quality of the wireless line 31, and the communication quality varies (for example, deteriorates). ), The communication line may be switched to the wired line 32. The wireless communication device 300 switches to the wired line 32 before a predetermined time elapses when the communication quality of the wireless line 31 varies. The wireless communication device 300 does not switch the communication line after receiving an instruction from an external device such as a network monitoring device.

  Next, the wireless communication device 300 communicates with the wireless communication device 320 via the switched wired line 32. Since the wireless communication device 320 is also communicating with the wireless communication device 310, the wireless communication device 300 communicates with the wireless communication device 310 via the wireless communication device 320 as shown in FIG. Can do.

  As a result of the above-described operation, the wireless communication system according to the third embodiment avoids a wireless line (wireless line 31) whose communication quality deteriorates in advance and communicates with other lines 32 and 33 as in the communication system of Patent Document 2. So that communication is not interrupted.

  In addition, the wireless communication system according to the third embodiment is different from the communication system disclosed in Patent Document 2 because the wireless communication apparatus itself switches the line, so that the network monitoring apparatus does not need an instruction to switch the line from the network monitoring apparatus. Communication is not interrupted even if a failure occurs.

[Description of effects]
According to the present embodiment, the wireless line communication system can switch the communication line so that the communication is not interrupted even if the network monitoring device fails or the connection between the network monitoring device and the wireless communication network is disconnected. be able to.

  The reason is that the wireless communication device itself provided in the wireless communication system of this embodiment acquires prediction information to predict the communication quality of the wireless link 31 and switches the line before the communication quality of the wireless link 31 fluctuates. Because.

  In addition, according to the present embodiment, every time a wireless communication device is newly installed in the wireless communication network, the wireless line communication system is configured to switch the communication line to the network monitoring device, specifically, the network diagram described above. Setting can be made unnecessary. This is because each wireless communication device itself provided in the wireless line communication system of this embodiment switches the communication line regardless of the network monitoring device. As a result, the wireless communication system according to the present embodiment can save the labor required for the system maintainer, specifically, the trouble of setting the network diagram.

  While the present invention has been described with reference to the embodiments, the present invention is not limited to the above embodiments. Various changes that can be understood by those skilled in the art can be made to the configuration and details of the present invention within the scope of the present invention.

  This application claims the priority on the basis of Japanese application Japanese Patent Application No. 2013-203430 for which it applied on September 30, 2013, and takes in those the indications of all here.

Furthermore, a part or all of each of the above embodiments can be described as in the following supplementary notes, but is not limited thereto.
(Appendix 1)
Obtaining prediction information to predict the communication quality of the wireless line, and switching the line before the communication quality of the wireless line changes,
A wireless communication apparatus.
(Appendix 2)
The switching is performed using a value corresponding to the communication quality of the wireless line and a routing protocol.
The wireless communication apparatus according to Supplementary Note 1, wherein:
(Appendix 3)
The prediction information includes a rainfall amount that is expected after a predetermined time has elapsed with a device connected via the wireless line,
The wireless communication apparatus according to Supplementary Note 2, wherein
(Appendix 4)
The prediction information includes at least one of the rainfall amount, the snowfall amount, the amount of particles in the air, and the traffic volume of a vehicle that is expected after a predetermined time has passed with the device connected via the wireless line. Information that includes one,
A value corresponding to the communication quality for each of the rainfall amount, the snowfall amount, the particle amount, and the traffic amount, that is, a communication quality value is obtained, and communication is performed using the largest communication quality value and the routing protocol. Switch line,
The wireless communication apparatus according to Supplementary Note 2, wherein
(Appendix 5)
The routing protocol is a spanning tree protocol.
The wireless communication device according to any one of appendices 2 to 4, characterized in that:
(Appendix 6)
Determining a state transition of a communication function unit provided for each line using the spanning tree protocol, and switching the line for communication to the line corresponding to the communication function unit in which the state transition is a forwarding state;
The wireless communication device according to any one of appendix 5, wherein
(Appendix 7)
Comprising at least one wireless communication device connected to a plurality of devices and connected to at least one of the devices via a wireless line;
The wireless communication device is the wireless communication device according to any one of appendices 1 to 6,
A wireless communication system.
(Appendix 8)
A weather prediction server that outputs the prediction information to the wireless communication device;
The wireless communication system according to appendix 7, wherein
(Appendix 9)
Obtaining prediction information to predict the communication quality of the wireless line, and switching the line before the communication quality of the wireless line changes,
A communication method characterized by the above.
(Appendix 10)
The switching is performed using a value corresponding to the communication quality of the wireless line and a routing protocol.
The communication method according to appendix 9, wherein
(Appendix 11)
The prediction information includes a rainfall amount that is expected after a predetermined time has elapsed with a device connected via the wireless line,
The communication method according to supplementary note 10, characterized by:
(Appendix 12)
The prediction information includes at least one of the rainfall amount, the snowfall amount, the amount of particles in the air, and the traffic volume of a vehicle that is expected after a predetermined time has passed with the device connected via the wireless line. Information that includes one,
A value corresponding to the communication quality for each of the rainfall amount, the snowfall amount, the particle amount, and the traffic amount, that is, a communication quality value is obtained, and communication is performed using the largest communication quality value and the routing protocol. Switch line,
The communication method according to supplementary note 10, characterized by:
(Appendix 13)
The routing protocol is a spanning tree protocol.
13. The communication method according to any one of appendices 10 to 12, characterized by:
(Appendix 14)
Using the spanning tree protocol, determining a state transition of a communication function unit provided for each line, and switching the line for communication to the line corresponding to the communication function unit in which the state transition is a forwarding state.
14. The communication method according to appendix 13, wherein

DESCRIPTION OF SYMBOLS 1 GPS function part 2 Position information acquisition part 3,203 Weather information acquisition part 4,204 Control part 5,205 Table storage part 6,206 Routing part 7 Wireless communication part 8 Wired communication part 10,20,30,40,210, 220, 230, 240, 300, 310, 320 Wireless communication device 31 Wireless line 32, 33 Wired line 50, 250 Weather prediction server 60, 70 Terminal 100 Wireless communication network 110 Network monitoring device 120 Weather data server

Claims (14)

Obtaining prediction information to predict the communication quality of the wireless line, and switching the line before the communication quality of the wireless line changes,
A wireless communication apparatus. The switching is performed using a value corresponding to the communication quality of the wireless line and a routing protocol.
The wireless communication apparatus according to claim 1. The prediction information includes a rainfall amount that is expected after a predetermined time has elapsed with a device connected via the wireless line,
The wireless communication apparatus according to claim 2. The prediction information includes at least one of the rainfall amount, the snowfall amount, the amount of particles in the air, and the traffic volume of a vehicle that is expected after a predetermined time has passed with the device connected via the wireless line. Information that includes one,
A value corresponding to the communication quality for each of the rainfall amount, the snowfall amount, the particle amount, and the traffic amount, that is, a communication quality value is obtained, and communication is performed using the largest communication quality value and the routing protocol. Switch line,
The wireless communication apparatus according to claim 2. The routing protocol is a spanning tree protocol.
The wireless communication device according to claim 2, wherein the wireless communication device is a wireless communication device. Determining the state transition of the communication function means provided for each line using the spanning tree protocol, and switching the line for communication to the line corresponding to the communication function means in which the state transition is in a forwarding state;
The wireless communication device according to claim 5, wherein the wireless communication device is a wireless communication device. Comprising at least one wireless communication device connected to a plurality of devices and connected to at least one of the devices via a wireless line;
The wireless communication device is the wireless communication device according to any one of claims 1 to 6.
A wireless communication system. A weather prediction server that outputs the prediction information to the wireless communication device;
The wireless communication system according to claim 7. Obtaining prediction information to predict the communication quality of the wireless line, and switching the line before the communication quality of the wireless line changes,
A communication method characterized by the above. The switching is performed using a value corresponding to the communication quality of the wireless line and a routing protocol.
The communication method according to claim 9. The prediction information includes a rainfall amount that is expected after a predetermined time has elapsed with a device connected via the wireless line,
The communication method according to claim 10. The prediction information includes at least one of the rainfall amount, the snowfall amount, the amount of particles in the air, and the traffic volume of a vehicle that is expected after a predetermined time has passed with the device connected via the wireless line. Information that includes one,
A value corresponding to the communication quality for each of the rainfall amount, the snowfall amount, the particle amount, and the traffic amount, that is, a communication quality value is obtained, and communication is performed using the largest communication quality value and the routing protocol. Switch line,
The communication method according to claim 10. The routing protocol is a spanning tree protocol.
The communication method according to any one of claims 10 to 12, wherein: Using the spanning tree protocol, determining a state transition of the communication function means provided for each line, and switching the line for communication to the line corresponding to the communication function means in which the state transition is in a forwarding state;
The communication method according to claim 13.

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