JP2013157781A - Communication failure section determination system - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a communication failure section determination system for determining a section with a communication failure in a state where radio communication is performed between a first communication station and a second communication station via a reflector.SOLUTION: A communication failure section determination system 1 for determining a section with a communication failure in a state where radio communication is performed between an A station 100 and a B station 200 via a reflector 300 includes: a reception intensity measurement unit 16 provided in the reflector 300 and measuring reception intensities of signals received from the A station 100 and the B station 200; and a determination task 21 for determining whether or not a communication failure occurs in a section between the A station and the reflector 300 or a section between the B station 200 and the reflector 300 on the basis of reception intensities when the communication failure occurs.

Description

  The present invention relates to a communication failure section determination system that determines a communication failure section in a state where a first communication station and a second communication station perform wireless communication via a reflector.

  When wireless communication is performed between the first communication station and the second communication station, if the linear propagation path cannot be obtained, the first communication station and the second communication station are connected via the reflector. A communication station can be connected. Such reflectors are often installed in places where it is difficult to secure an external power source such as a mountainous area (mountain peak), and therefore, those that operate even in a non-powered state are installed.

  When stable communication cannot be performed due to fading or radio ducts in the propagation path of wireless communication (communication failure occurs), the section is quickly judged and the output is increased, or the important line is bypassed It is necessary to take measures such as In the first communication station and the second communication station, the reception intensity can be measured in order to monitor the communication state. That is, when a decrease in reception strength is detected in the first communication station and the second communication station, it is clear that a communication failure has occurred in the section. However, when a reflector is disposed between the first communication station and the second communication station, between the first communication station and the reflector, between the second communication station and the reflector. It was difficult to determine in which interval the communication failure occurred.

  By the way, there is known a technique related to a reception strength lowering determination apparatus for a microwave communication line that performs a determination of a decrease in reception strength of a microwave line connecting a transmitting station and a receiving station with a reflector that reflects radio waves (for example, , See Patent Document 1). This microwave communication line reception strength decrease judging device uses the output from the inclination sensor attached to the parabolic antenna, and whether the cause of the decrease in the reception strength is due to the shift of the mounting angle of the parabolic antenna, or the propagation path It is simply determined whether it is caused by the above cause.

JP 2007-298370 A

  However, although the technique described in the cited document 1 can determine the cause of the decrease in reception intensity, communication failure occurs between the transmitting station and the reflecting plate and between the receiving station and the reflecting plate. It was impossible to determine whether they were doing.

  An object of the present invention is to provide a communication failure section determination system that solves the above-described problems and determines a communication failure section in a state in which the first communication station and the second communication station communicate wirelessly via a reflector. It is to provide.

  In order to solve the above-mentioned problem, the invention of claim 1 is a communication failure section for determining a communication failure section in a state in which the first communication station and the second communication station communicate wirelessly via a reflector. A determination system, provided on the reflector, for measuring reception intensity of signals received from the first communication station and the second communication station; and when communication failure occurs, A determination means for determining whether a communication failure has occurred in a section between the first communication station and the reflector or a section between the second communication station and the reflector based on reception intensity; It is a communication failure section determination system characterized by comprising.

  In the first aspect of the present invention, when a communication failure occurs, a communication failure occurs in the section between the first communication station and the reflecting plate or in the section between the second communication station and the reflecting plate based on the received intensity. It is determined whether or not

  According to a second aspect of the present invention, in the poor communication section determination system according to the first aspect, the meteorological information acquisition means for acquiring the weather information around the section at the time when the poor communication occurs, and the meteorological information acquisition means Storage means for storing the acquired weather information in association with the reception intensity at the time when the communication failure occurs is provided.

  According to the first aspect of the present invention, when a communication failure occurs between the first communication station and the second communication station, the section between the first communication station and the reflector or the second communication station It can be determined whether communication failure has occurred between the reflector and the section. That is, even in a state where the first communication station and the second communication station communicate wirelessly via the reflector, it is possible to determine the section where the communication failure has occurred, so the communication state can be determined more quickly and appropriately. It is possible to improve.

  According to the second aspect of the present invention, since the weather information and the reception intensity around the section at the time when the communication failure occurs are stored in association with each other, the relationship between the reception intensity and the weather information is based on the accumulated information. It becomes possible to analyze the trend and grasp the trend. That is, it is possible to infer weather information that is likely to cause a communication failure from the accumulated weather information when the communication failure occurs.

It is the schematic which shows the communication failure area determination system which concerns on embodiment of this invention. It is the schematic which shows a 1st communication station, a 2nd communication station, a reflecting plate, and a radio station monitoring location. It is the schematic explaining the reflection of the signal in the reflecting plate of the poor communication area determination system of FIG. It is the schematic which shows arrangement | positioning of the reflector and antenna of the poor communication area determination system of FIG. It is a flowchart which shows the determination process in the communication failure area determination system of FIG. It is a figure which shows the relationship between receiving intensity and a weather condition. It is a data block diagram of the communication failure information database of the communication failure area determination system of FIG. It is a figure which shows an example of the failure information of the communication failure information database of FIG.

  Hereinafter, description will be given based on the embodiment of the present invention.

  1 to 8 show an embodiment of the present invention. As shown in FIG. 1, the poor communication section determination system 1 includes a reflector-side device 10 disposed in a reflector 300, a monitoring server 20 disposed in a wireless station monitoring location 400, an A station 100, The B station 200 is connected via a communication network NW so as to be communicable in a wired or wireless manner. As shown in FIG. 2, this poor communication section determination system 1 is in a state where the A station 100 as the first communication station and the B station 200 as the second communication station communicate wirelessly via the reflector 300. And has a function of determining a section of communication failure. Here, the propagation path between the A station 100 and the B station 200 is composed of a section A between the A station 100 and the reflector 300 and a section B between the B station 200 and the reflector 300. ing. The radio station monitoring point 400 constantly monitors the communication state of such a propagation path.

  The A station 100 includes the antenna 101 and performs communication with the A-direction antenna 11 </ b> A installed on the reflector 300 to measure the reception intensity (reception level). In addition, the A station 100 determines in a control unit (not shown) whether or not the reception intensity has decreased. That is, it is determined that the reception strength has decreased, for example, (a) when the latest reception strength has decreased to a predetermined value or less, (b) when the latest reception strength has decreased by a predetermined value or more from the previous reception strength, When the reception strength is not reduced, only the reception strength is transmitted to the radio station monitoring location 400. When the reception strength is reduced, the reception strength and the reception strength reduction alarm are transmitted to the radio station monitoring location 400. Transmit to. In addition, the A station 100 transmits the transmission intensity of the signal transmitted toward the B station 200 to the radio station monitoring point 400.

  The B station 200 is configured in the same manner as the A station 100, has the antenna 201, communicates with the B-direction antenna 11B installed on the reflector 300, and measures the reception intensity (reception level). In addition, the B station 200 determines whether or not the reception intensity has decreased in a control unit (not shown). Then, the B station 200 transmits to the radio station monitoring point 400 the reception intensity, the reception intensity lowering alarm, the transmission intensity of the signal transmitted to the A station 100, and the like.

As shown in FIG. 3, the reflector 300 reflects the signal f ₁ incident from the A station 100 and transmits the signal f ₁ to the B station 200, and reflects the signal f ₂ incident from the B station 200. To be transmitted. When the area of the reflector 300 is a size proportional to the effective projection area Ae = αA cos θ of the incident signal f ₁ , the incident energy is received as a receiving antenna (gain: 4παA cos θ / λ ² ) and is directed toward the target direction. To transmit as a transmission antenna (gain: 4παA cos θ / λ ² ). Here, A is the actual area of the reflector, θ is the incident angle or reflection angle, Ae is the effective aperture area of the reflector, and α is an ability determined by the degree of area, size, and material (α = 1). ).

Further, since the reflection loss in the reflector 300 is Z ₀ = 20 log ₁₀ (cos θ), for example, when θ> 45 °, the reflection loss is 3 db, and when θ> 60 °, there is a loss of 6 db. Become. That is, the signal strengths of the signals f ₁ and f ₂ are set in consideration of this loss.

  The reflector-side device 10 of the poor communication section determination system 1 is disposed on the reflector 300, and mainly includes an antenna 11, a band-pass filter (BPF) 12, a high-frequency amplifier 13 and the like, as shown in FIG. A reception intensity measurement unit 16 as a reception intensity measurement means including a detection unit 14 and an analog / digital conversion unit (A / D conversion unit) 15, a communication intensity database 17, a communication unit 18, and these are controlled. And a control unit 19. Here, as shown in FIG. 2, the reception intensity measuring unit 16 is arranged corresponding to each directionality in the A direction and the B direction, with “A” in the A direction and “B” in the B direction. “B” is attached to each symbol for distinction. Here, the direction A will be mainly described.

The antenna 11A receives a signal from the station A 100 and is disposed on the reflector 300 as shown in FIGS. 3 and 4 and has directionality in the direction A, and has an angular loss. It is arranged in the direction where there is no. That is, with respect to the propagation direction of the signal f ₁ from the A station 100, receiving surface of the antenna 11A is disposed so as to be orthogonal.

  The signal received by the antenna 11A is transmitted only through the BPF 12A at a desired frequency (target frequency, several to several tens of MHz). Then, after selecting or amplifying the signal by the high frequency amplifier 13A and restoring the signal by the detector 14A, the analog signal is converted into a digital signal by the A / D converter 15A. The reception intensity of the signal received from the A station 100 is measured by the reception intensity measurement unit 16A having such a configuration.

  The reception intensity measurement unit 16B is configured in the same manner as the reception intensity measurement unit 16, and measures the reception intensity of the signal received from the B station 200.

  The communication strength storage unit 17 stores a communication strength database 17 a such as the reception strength measured by the reception strength measurement unit 16. The communication strength database 17a stores reception strength for each section and time. That is, the reception strength of the section is accumulated in the communication strength database 17a.

  The communication unit 18 enables data communication via the communication network NW, and transmits and receives data and the like with the monitoring server 20.

  The control unit 19 has a function of controlling the reception strength measurement unit 16 and storing the measured reception strength in the communication strength database 17a.

  The reflector-side device 10 having such a configuration is provided with a solar power generation device (not shown) with a built-in power storage device, and can operate even in a non-powered state without an external power source.

  As shown in FIG. 1, the monitoring server 20 mainly includes a determination task 21 as a determination unit, a weather information acquisition task 22 as a weather information acquisition unit, a communication failure information storage unit 23 as a storage unit, and a communication unit 24. And a control unit 25 that performs these controls.

  In the determination task 21, when a communication failure occurs, a communication failure occurs in the section A between the station A 100 and the reflector 300 or in the section B between the station B 200 and the reflector 300 based on the received intensity. These programs and tasks have a function for determining whether or not, and perform processing based on the flowchart shown in FIG. The determination task 21 is activated when the control unit 25 receives a reception intensity reduction alarm from the A station 100 or the B station 200.

  When the determination task 21 is activated, first, all section information between the A station 100 and the B station 200 that are the monitoring targets of the wireless station monitoring point 400 is acquired (step S1). Here, the section information is stored in a storage unit (not shown). Then, the first section is acquired from the acquired section information (step S2).

  Next, the reception intensity of the section is acquired (step S3). That is, the reception intensity of the section is acquired from the communication intensity database 17a of the reflector side device 10.

  Next, it is determined from the acquired reception intensity whether or not the section has a communication failure (step S4). Here, whether or not there is a communication failure is (A) whether or not the latest reception strength has decreased to a predetermined value or less, and (B) the latest reception strength has decreased by a predetermined value or more from the previous reception strength. Whether or not (C) the latest reception strength is lower than the transmission strength by a predetermined value or less. When it corresponds to any of (A) to (C), it is determined that the section is in communication failure. Specifically, (A) determines whether or not the latest received strength is equal to or less than a threshold value, and (B) determines whether or not the latest received strength is drastically decreased, and (C ) Determines whether or not the latest reception strength is lower than the transmission strength by a threshold value or more, that is, whether or not an allowable loss is exceeded. If the communication is not defective (“NO”), the process proceeds to step S7.

  When communication is poor (in the case of “YES”), the process proceeds to step S5, and a weather information acquisition task 22 described later is activated. And the acquired weather information is memorize | stored in the communication failure information database 23a (step S6).

  Next, it is determined whether or not all the sections are finished (step S7). If not finished (in the case of “NO”), the next section is acquired in step S8 and the process proceeds to step S3. The process is repeated until all the sections are completed. When all the sections are finished (in the case of “YES”), the process of this determination task 21 is finished.

  The weather information acquisition task 22 is a program or task having a function of acquiring weather information around the section at the time when communication failure occurs. Here, the weather information is, for example, rainfall, weather maps, lightning strikes, temperatures, etc., and is obtained from, for example, a database provided by a competent authority or public institution, or a database provided by a private company. Can do. The meteorological information acquisition task 22 is started in step S5 when a predetermined condition is satisfied in the determination task 21.

  For example, as shown in FIG. 6, when the reception strength decreases in a certain section, that is, when the determination task 21 determines that a communication failure has occurred in a certain section, the weather condition ( Here, a thick fog and a lightning strike are acquired. In this example, there is a thick fog or a lightning strike before the occurrence of communication failure, and the data is acquired. Here, the vicinity of the occurrence time of communication failure is set to be longer than the time at which weather condition data that can cause communication failure can be acquired, and differs depending on the update interval of the database of the acquisition source (provider), for example, It is set from several minutes to several tens of minutes before and after the occurrence time of communication failure.

  The communication failure information storage means 23 stores the weather information acquired by the weather information acquisition task 22 and the reception strength at the time when the communication failure occurs in association with each other as a communication failure information database 23a. As shown in FIG. 7, the communication failure information database 23 a stores a situation 233, a weather condition 234, a response 235, and others 236 for each communication failure occurrence time 231 and each occurrence section 232. The occurrence time 231 stores the time when communication failure occurred. The time can be acquired accurately from a radio clock or GPS (not shown) disposed on the reflector 300. In the generation section 232, the section determined by the determination task 21 is stored. In the situation 233, the reception intensity measured by the reception intensity measuring unit 16 is stored as a communication failure situation. The weather condition 234 stores the weather information of the section around the time when the communication failure acquired by the weather information acquisition task 22 occurs. The correspondence 235 stores correspondence contents for the communication failure.

  For example, data as shown in FIG. 8 is stored as an example of the communication failure information database 23a. Specifically, when the occurrence time 231 is XX year ** month ** day XX: XX and the occurrence section 232 is XX section, the signal level in the situation 233 is lowered to XX, and the weather condition 234 is Precipitation is stored as OOmm / h. In addition, the response 235 taken to avoid communication failure stores that the output has been increased. When the occurrence time 231 is △△ year △ month △ day △: △△ and the occurrence section 232 is △△ section communication failure, the signal level is reduced to △△ in the situation 233, and the weather condition 234 is stored as dense fog, lightning strike Has been. The correspondence 235 taken to avoid communication failure stores that the important line has been switched. If the occurrence time 231 is xx year x month x day x: xx, and the communication failure in the occurrence section 232 is xx section, the signal level in the situation 233 drops to xx, and the weather condition 234 is precipitation x mm / It is stored as h. In addition, the response 235 taken to avoid communication failure stores that the output has been increased. Based on such a communication failure information database 23a, the relationship between the communication failure and the weather condition can be easily grasped.

  The communication unit 24 enables data communication via the communication network NW, and transmits / receives data and the like to / from the reflector side device 10, the A station 100, and the B station 200.

  The control unit 25 constantly monitors the reception intensity transmitted from the A station 100 and the B station 200, a reception intensity lowering alarm, and the transmission intensity and stores them in a storage unit (not shown) or starts the determination task 21. It has a function to do.

  The storage unit (not shown) stores various data, programs, and tasks necessary for the communication failure section determination system 1. In addition, the storage unit stores reception intensity, reception intensity reduction alarm, transmission intensity, and the like transmitted from the A station 100 and the B station 200.

  Next, the determination process, the weather information acquisition process, and the operation in the poor communication section determination system 1 having such a configuration will be described.

  Here, for example, as shown in FIG. 2, the section between the A station 100 and the reflector 300 is A, the section between the B station 200 and the reflector 300 is B, and the A station 100 and the B station 200 are reflected. A case where communication failure occurs in the section B in the propagation path in which wireless communication is performed via the board 300 will be described.

  In the A station 100 and the B station 200, the reception intensity is constantly measured and monitored. If communication failure occurs in the section B, the reception intensity decreases in the A station 100 and the B station 200. The station 200 transmits a reception intensity and a reception intensity decrease warning to the monitoring server 20.

  In the monitoring server 20, when the reception intensity and the reception intensity decrease alarm are received from the A station 100 and the B station 200, the determination task 21 is activated by the control unit 25.

  In the determination task 21, all the sections, that is, the section A and the section B are acquired in step S1. In step S2, section A is acquired as the first section, and in step S4, section A is determined not to have poor communication. Specifically, the section A includes (A) whether or not the latest reception strength is less than or equal to a threshold, (B) whether or not the latest reception strength is drastically decreased, and (C) the latest reception strength is It is determined whether or not the transmission intensity is lower than the threshold value, that is, whether or not the permissible loss is exceeded. And in step S7, since all the sections are not complete | finished, it progresses to step S8 and the area B is acquired as a next area.

  The section B is determined to have a communication failure in step S4. Specifically, the section B includes (A) whether or not the latest reception strength is less than or equal to a threshold value, (B) whether or not the latest reception strength is drastically decreased, and (C) the latest reception strength is It is determined whether or not the transmission intensity is lower than a threshold value, that is, whether or not an allowable loss is exceeded. And it progresses to step S5 and the weather information acquisition task 22 is started. Then, the weather information acquisition task 22 acquires the weather information at the time when the communication failure around the section B occurs. For example, as shown in FIG. 6, information on dense fog and lightning strikes is acquired from a database of another system such as a distribution automation system as weather conditions near the time of occurrence of communication failure. In step S6, data as shown in FIG. 8 is registered in the communication failure information database 23a.

  And in step S7, since all the sections are complete | finished, the process of this determination task 21 is complete | finished.

  In this way, when a communication failure occurs in the propagation path in which the A station 100 and the B station 200 communicate wirelessly via the reflector 300 by the determination task 21, the A station 100 is based on the reception intensity. Whether or not a communication failure has occurred in section A or B station 200 and reflector 300 and section B. That is, in this embodiment, it is determined that a communication failure has occurred in section B.

  As described above, according to the communication failure section determination system 1, when a communication failure occurs between the A station 100 and the B station 200, the section A or the B station between the A station 100 and the reflector 300 is used. It is possible to determine whether communication failure has occurred in 200, the reflector 300, and the section B. That is, even in a state where the A station 100 and the B station 200 communicate wirelessly via the reflector 300, it is possible to determine the section in which the communication failure occurs, so that the communication failure can be resolved more quickly and appropriately. Can take action. That is, it is possible to provide a more stable communication state and improve the communication state.

  Further, since the weather information and the reception intensity around the section at the time when the communication failure occurs are associated and stored in the communication failure information database 23a, the relationship between the reception intensity and the weather information is analyzed based on the accumulated information. It is possible to estimate the causal relationship between poor communication and weather. That is, since it becomes easy to grasp the relation between the communication failure and the weather condition from the weather information at the time of the communication failure accumulated in the communication failure information database 23a, it is possible to estimate the weather information that is likely to cause the communication failure. It becomes. That is, for example, it is possible to infer the communication trends with respect to the season of the section and the communication for each time, the relationship with weather conditions, and the like.

  Furthermore, since the solar power generation device (not shown) with a built-in power storage device is disposed in the reflector side device 10, it can operate even in a non-powered state. It can be easily applied.

Although the embodiment of the present invention has been described above, the specific configuration is not limited to the above embodiment, and even if there is a design change or the like without departing from the gist of the present invention, Included in the invention. For example, in the above-described embodiment, the case where there is one reflector 300 has been described. However, even when there are a plurality of reflectors 300, it is determined in the same way whether communication failure has occurred in each section. it can. In this case, each of the reflectors 300 is provided with the reflector-side devices 10 ₁ to 10 _n , and the determination task 21 repeats the processing from step S2 to step S8 for all the intervals, thereby determining the communication failure interval. It is possible.

  The reception intensity measured by the reception intensity measuring unit 16 of the reflector side device 10 is stored in the communication intensity database 17a. However, the measured reception intensity is transmitted to the monitoring server 20 as needed, and the monitoring server 20 You may make it store as a database.

DESCRIPTION OF SYMBOLS 1 Communication failure area determination system 10 Reflector side apparatus 16 Reception intensity measurement part (reception intensity measurement means)
17a Communication strength database 20 Monitoring server 21 Determination task (determination means)
22 Weather information acquisition task (Meteorological information acquisition means)
23a Communication failure information database (storage means)
100 A station (first communication station)
200 station B (second communication station)
300 Reflector 400 Radio station monitoring point

Claims (2)

In a state where the first communication station and the second communication station perform wireless communication via the reflector, a communication failure section determination system that determines a section of communication failure,
A reception intensity measuring means for measuring the reception intensity of signals received from the first communication station and the second communication station, provided on the reflector;
When a communication failure occurs, a communication failure occurs in the section between the first communication station and the reflector or the section between the second communication station and the reflector based on the reception strength. Determination means for determining whether or not
A communication failure section determination system comprising: Weather information acquisition means for acquiring weather information around the section at the time when the communication failure occurs;
Storage means for associating and storing weather information acquired by the weather information acquisition means and the reception intensity at the time when the communication failure occurs;
The communication failure section determination system according to claim 1, further comprising:

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