JP2012044499A - Thunderbolt risk reduction system, method and communication network system - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent a communication service from being interrupted when a thunderbolt occurs in the vicinity of a communication facility in an optional area by avoiding lightning damage to the communication facility due to the thunderbolt.SOLUTION: A thunderbolt risk reduction system determines the existence of thunderbolt activities in a thunderbolt risk area associated with each communication facility on a communication network system based on latest thunderbolt information acquired from outside, and avoids communication failure due to a thunderbolt by handing over functions of a communication facility having a thunderbolt risk to a communication facility without the thunderbolt risk.

Description

  The present invention relates to a lightning strike avoidance system, method, and communication network system, and more particularly, to a lightning strike avoidance system and method for avoiding damage to communication facilities due to lightning strikes in a communication network in which a plurality of communication facilities transmit data via the network. And communication networks.

  In recent years, electronic circuits have become denser and more advanced due to advances in semiconductor technology and circuit technology, but on the other hand, overvoltage tolerance of electrical and electronic equipment has come as a price for increasing the density and functionality of electronic circuits. The problem of lightning strikes has become obvious along with various electromagnetic environmental problems. As a problem caused by lightning strikes, for example, electrical and electronic devices in buildings are exposed to electromagnetic fields generated by lightning surges and lightning electromagnetic pulses (LEMP) transmitted by overhead wires, and thus are overvoltage resistant. There was a problem that low electrical and electronic devices would be destroyed (hereinafter, these problems are collectively referred to as “lightning damage”).

  Also, in the field of communication facilities, the formation of a large-capacity and high-speed information communication network is rapidly progressing due to the broadband transmission system, and countermeasures against lightning damage in user facilities as well as relay networks are becoming more important.

  As a conventional lightning damage countermeasure technology, a technology for examining a lightning damage risk map by analyzing the relationship between the number of lightning damage failures, the number of lightning strikes, and the number of facilities in a telecommunications company is known (non-patent literature). 1). In addition, a technique is known in which a spare line is substituted for a currently used transmission facility (optical fiber or metal cable), and a transmission path is switched when a communication network fails (Patent Document 1).

Patent No. 3801999 (Japanese Patent Laid-Open No. 2004-28140)

IEICE, Technical Report, Vol.105, No.454 (EMCJ2005-122), pp.45-49, 2005.12.02

However, the technology described in Non-Patent Document 1 is to set the risk of lightning damage geographically based on past information on the location of lightning strikes and lightning damage failures, and to prioritize and increase the efficiency of lightning damage countermeasures. It is intended and is not a technique for avoiding lightning damage caused when a lightning strike actually occurs. The technology described in Patent Document 1 relates to a method of switching to an appropriate transmission path when a general transmission facility fails, and avoids lightning damage according to the location of the lightning strike when a lightning strike occurs. It is not a technology that realizes That is, according to the conventional technology, when a lightning strike actually occurs, there is a case where the lightning damage caused by the lightning strike cannot be avoided, and the communication service in the communication network is interrupted.
Accordingly, the present invention has been made to solve the above-described problem. When a lightning strike occurs in the vicinity of a communication facility in an arbitrary region, the communication service avoids lightning damage to the communication facility due to the lightning strike. The purpose is to prevent interruption.

  In order to achieve the above object, the present invention sets in advance for each of the communication equipment from the lightning strike information acquired by the acquisition unit that obtains lightning strike information indicating the occurrence of lightning strike from the outside. Of the lightning risk area that has been subjected to lightning activity, and the communication equipment corresponding to the lightning risk area identified as having lightning activity by the identification unit. The data transmission function includes an execution unit that performs a lightning strike avoidance operation that substitutes a communication facility other than the communication facility corresponding to the lightning risk region identified as having lightning strike activity.

  Further, in the present invention, the identification unit includes an extraction unit that extracts the lightning strike risk region where a lightning strike has occurred based on the lightning strike information acquired by the acquisition unit, and a lightning strike risk region extracted by the extraction unit. A determination unit may be provided that determines that lightning activity is present when lightning continuously occurs.

  Further, in the present invention, the execution unit performs the lightning risk avoiding operation based on communication quality required for data transmitted by a communication facility corresponding to the lightning risk region identified as having lightning activity by the identifying unit. Of these, either an avoidance route determination operation that determines an avoidance route for transmitting the data while avoiding the communication facility, or a transmission capacity limit value determination operation that determines a limit value of the data transmission capacity by the communication facility And an operation execution unit that executes transmission control of the data according to the lightning strike avoidance operation selected by the operation selection unit.

  Further, in the present invention, the operation selection unit is predetermined by identifying a communication quality level defined in data transmitted by a communication facility corresponding to the lightning strike risk area identified as having lightning activity by the identification unit. The avoidance route determination operation may be selected when the communication quality level condition is met, and the transmission capacity limit value determination operation may be selected otherwise.

Further, in the present invention, when the end of the lightning strike activity in the lightning strike risk area is identified by the identification unit, the execution unit may end the lightning strike avoidance operation being performed for the communication equipment. good.
Further, in the present invention, the lightning activity is terminated if the identification unit is unable to recognize a lightning strike even after a predetermined time has elapsed since the last time the lightning strike was recognized within the lightning strike risk area identified as having lightning activity. It may be identified.

  Further, in the present invention, in the communication network system comprising the communication facility for transmitting data via a communication network and a management device connected to the communication network and managing the operation of the communication facility, the communication facility One of the management device and the management device may be provided with the function of the lightning risk avoidance system according to the present invention described above.

  According to the present invention, it is recognized that a lightning strike has occurred in a lightning strike risk area associated with each communication facility, and the data transmission function of the communication facility corresponds to a lightning strike risk area in which no lightning strike has occurred. By substituting for the equipment, it is possible to avoid lightning damage to the communication equipment due to lightning strikes, and therefore it is possible to prevent interruption of communication services due to lightning strikes.

It is a figure which shows an example of the whole structure of the communication network system containing the lightning strike avoidance system concerning the 1st Embodiment of this invention. It is a figure which shows the structure of the lightning strike risk avoidance system concerning 1st Embodiment. It is a figure which illustrates conceptually the network between communication facilities, and the influence range of a lightning strike. It is a figure which illustrates notionally the relationship between the lightning strike risk area | region matched with the communication equipment, and the lightning strike spot in a fixed time. It is a flowchart which shows operation | movement of the lightning strike risk avoidance system concerning 1st Embodiment. It is a flowchart which shows the specific operation | movement of the lightning strike risk object installation of the lightning strike risk avoidance system concerning 1st Embodiment. It is a figure explaining an example of the method of discriminating the presence or absence of a lightning strike activity. It is a figure which shows the structure of the lightning strike avoidance system concerning the 2nd Embodiment of this invention. It is a flowchart which shows operation | movement of the lightning strike risk avoidance system concerning 2nd Embodiment. It is a figure explaining the setting method of the avoidance route of the lightning strike avoidance system concerning 2nd Embodiment. It is a figure which shows an example of the route matrix of the communication equipment of the communication network system in 2nd Embodiment. It is a flowchart which shows the production | generation operation | movement of the route matrix by the lightning strike risk avoidance system concerning 2nd Embodiment. It is a figure explaining the limit value determination method of the transmission capacity of the lightning strike avoidance system concerning 2nd Embodiment. It is a flowchart which shows the limit value determination operation | movement of the transmission capacity of the lightning strike avoidance system concerning 2nd Embodiment.

Hereinafter, embodiments of the present invention will be described with reference to the drawings.
[First Embodiment]
In the lightning strike avoidance system according to the first embodiment of the present invention, the presence or absence of lightning strike activity in the lightning strike risk area associated with each communication facility on the communication network system based on the latest acquired lightning strike information. Thus, the function of a communication facility having a risk of lightning strike is replaced with a communication facility having no risk of lightning strike, thereby avoiding a communication failure due to lightning strike.

FIG. 1 is a diagram illustrating an example of a configuration of a communication network system including a lightning strike risk avoidance system according to the present embodiment. As shown in FIG. 1, a plurality of communication facilities 30-1 to 30-n and a communication control management center 20 that manages these communication facilities 30-1 to 30-n perform data transmission via a communication network 10, respectively. Communication.
The lightning strike avoidance system according to the present embodiment is provided in the communication control management center 20 that centrally manages the communication network system shown in FIG. The data transmission function is replaced with communication equipment that does not have the risk of lightning strikes.

FIG. 2 is a block diagram illustrating a configuration of the lightning strike avoidance system according to the present embodiment. As shown in FIG. 2, the lightning strike risk 100 according to this exemplary embodiment includes an acquisition unit 110, an identification unit 120, an execution unit 130, and a storage unit 140.
The acquisition unit 110 acquires lightning strike information indicating the latest lightning occurrence status from the outside. For example, the latest weather information provided by a weather information company or the like is acquired via the communication network 10, and lightning strike information indicating the latest lightning occurrence status (for example, occurrence position or time) is acquired from the acquired weather information. Can do.

The identification unit 120 identifies the presence or absence of a lightning strike based on the lightning strike information acquired by the acquisition unit 110, and within a lightning strike risk area that is an area set in advance for each of the communication facilities 30-1 to 30-n. Identify the presence or absence of lightning activity.
Specifically, the extraction unit 121 of the identification unit 120 extracts a lightning strike risk region where a lightning strike has occurred based on the acquired lightning strike information, and the determination unit 122 continues within the lightning strike risk region extracted by the extraction unit 121. Whether lightning strikes are detected or not is determined.

  The execution unit 130 uses the data transmission function of the communication facility 30-n corresponding to the lightning risk area determined to have lightning activity by the identification unit 120 as the communication facility corresponding to the lightning risk area determined to have lightning activity. The lightning strike avoidance operation to be replaced with a communication facility 30-m different from 30-n is executed.

The storage unit 140 is acquired by the acquisition unit 110, information on the installation locations and connection status of the communication facilities 30-1 to 30-n managed by the communication control management center 20 and information on the lightning risk area associated with each communication facility. Memorized information such as weather information.
Here, the information on the lightning strike risk area stored in the storage unit 140 is, for example, information indicating a range where lightning strikes may occur due to lightning strikes according to the installation locations of the communication facilities 30-1 to 30-n. Moreover, it is good also as information showing the range of the fixed distance preset around the installation point of the communication equipment 30-1-30-n.

  Note that each component of the lightning strike avoidance system 100 according to the present embodiment includes a computer program (a computer program (CPU), a memory, and an interface mounted on the communication control management center 20 of the communication network system). The various functions of the lightning strike avoidance system 100 described above are realized by cooperation of various hardware resources of the computer and the computer program.

<About judgment of lightning risk area and lightning activity>
The lightning strike risk area and the lightning activity determination function by the identification unit 120 will be described in detail with reference to FIGS.
When a lightning strike occurs, there is a risk that lightning damage will occur in which electrical equipment and electronic devices of communication equipment installed near the point where the lightning strikes are destroyed by a lightning surge or the like. The probability of occurrence of this lightning damage becomes higher as it is closer to the lightning occurrence point, and there is a possibility that some lightning damage will occur within a certain distance range from the lightning occurrence point. Here, FIG. 3 conceptually shows the communication equipment 30-n and the lightning strike influence range. As shown in FIG. 3, the plurality of communication facilities 30-1 to 30-n (nodes) are connected to each other via a transmission path (link) to form a communication network. When a lightning strike occurs, there is a possibility that lightning strike will occur in the communication equipment 30-n existing in the lightning strike risk area, which is an area of a certain distance range (rkm) centering on the lightning strike point. The closer to the center of the risk area, that is, the lightning strike point, the higher the probability of lightning damage.

For example, if the possibility of lightning damage to the communication equipment is in the range of about 2 km from the point where the lightning strikes, the radius of the lightning risk area shown in FIG. 3 is 2 km, and within 2 km from the location of the lightning strike The installed communication equipment has the possibility of lightning damage.
Therefore, by setting an area (lightning strike risk area) where lightning damage is likely to occur centering on the installation location of the communication equipment for each of the communication equipment forming the communication network, A communication facility associated with a lightning strike risk area where a lightning strike has occurred can be identified from the point information of the communication facility.

  FIG. 4 is a diagram conceptually illustrating a relationship between a lightning strike risk area associated with a communication facility and a lightning strike point within a certain period of time. As shown in FIG. 4, since lightning strikes have occurred in the lightning strike risk area associated with the communication facility 30-1 and the communication facility 30-2, the communication facility 30-1 and the communication facility 30-2 are It is determined that there is a possibility of lightning damage, and these facilities are regarded as lightning risk target facility candidates. When a lightning risk target facility candidate is identified, it is determined whether or not there is a continuous lightning strike (hereinafter referred to as “lightning activity”) within the lightning risk region associated with the lightning risk target facility candidate.

Specifically, the extraction unit 121 of the identification unit 120 uses a lightning strike where a lightning strike has occurred based on the lightning strike location based on the lightning strike information acquired by the acquisition unit 110 and the location information of the communication facilities 30-1 to 30-n. The communication equipment 30-1 and the communication equipment 30-2 associated with the risk area are extracted as lightning risk target equipment candidates. When the lightning risk target facility candidate is extracted by the extraction unit 121, the determination unit 122 detects the presence or absence of lightning activity in the lightning risk region corresponding to the lightning risk target facility candidate.
For example, as shown in FIG. 4, in the lightning strike risk area of the communication equipment 30-1 extracted as a lightning risk target equipment candidate by the extraction unit 121, two lightning strikes have occurred within a certain time. The unit 122 determines that there is lightning activity in the lightning risk area of the communication facility 30-1. On the other hand, in the lightning strike risk area of the communication facility 30-2, since there is only one lightning strike within a certain time, the determination unit 122 determines that there is no lightning activity in the lightning strike area of the communication facility 30-2.

Next, operation | movement of the lightning strike risk avoidance system 100 concerning this Embodiment is demonstrated with reference to FIGS.
FIG. 5 is a flowchart showing the operation of the lightning strike risk avoidance system 100. As illustrated in FIG. 5, the lightning strike risk avoidance system 100 acquires lightning strike information indicating the location and time of occurrence of lightning based on the latest weather information by the acquisition unit 110 and stores it in the storage unit 140 (S11).

  When the lightning strike information based on the latest weather information is obtained by the obtaining unit 110, the identification unit 120 performs lightning strikes within the lightning strike risk region associated with the communication facilities 30-1 to 30-n based on the lightning strike information. The presence or absence of activity is determined, and the lightning risk target facility is specified from the determination result (S12).

Here, the operation of identifying the lightning risk target facility by the identification unit 120 will be described in detail with reference to the flowchart shown in FIG.
As illustrated in FIG. 6, the extraction unit 121 of the identification unit 120 acquires lightning strike information that is information on the location and time of the latest lightning strike stored in the storage unit 140 (S101) and stores the information in the storage unit 140. The distance between the occurrence point of the lightning strike and the communication facilities 30-1 to 30-n is calculated from the information related to the installed locations of the communication facilities 30-1 to 30-n and the lightning strike information (S102).

When the distance between the communication facilities 30-1 to 30-n and the lightning strike point is calculated, the extraction unit 121 calculates the lightning strike risk in which the lightning strike point is associated with each communication facility from the calculated distance. It is determined whether it is within the area (S103).
When the lightning occurrence point is in the lightning risk area (“YES” in S103), the extraction unit 121 extracts the communication equipment 30-n corresponding to the lightning risk area and sets it as a lightning risk target equipment candidate ( S104).
On the other hand, if the lightning occurrence point is not within the lightning risk area (“NO” in S103), the extraction unit 121 sets the communication equipment 30-m corresponding to the lightning risk area as a lightning risk target equipment candidate. (S105).

When a lightning risk target facility candidate is set by the extraction unit 121, the determination unit 122 determines whether or not there is a lightning activity in which lightning strikes continuously in a lightning risk region associated with the lightning risk target facility candidate ( S106). Specifically, the presence or absence of lightning activity is determined by identifying whether or not lightning strikes have occurred a plurality of times in a certain amount of time in a lightning risk area associated with a lightning risk target facility candidate.
Here, an example of a method for determining the presence or absence of lightning activity is shown in FIG. The extraction unit 121 outputs a lightning strike signal indicating that a lightning strike has occurred in a lightning strike risk area associated with a lightning strike risk target facility candidate from the latest lightning strike information stored in the storage unit 140 to the determination unit 122. When receiving a lightning strike signal for the first time, outputs a stored signal that activates the monitoring state of the number of times the lightning strike is received. As shown in FIG. 7, the accumulated signal is output for a predetermined time A (for example, 1 minute).

  The determination unit 122 determines that there is a lightning activity by receiving a predetermined number of lightning strike signals while the accumulated signal is output, and outputs a determination signal. If the predetermined number of lightning strike signals are not received, the lightning activity It is judged that there is no signal and no judgment signal is output. For example, as illustrated in FIG. 7, when the second lightning strike signal is received while the accumulation signal is output (predetermined time A), the determination unit 122 determines that there is a lightning strike and outputs a determination signal.

When the determination result of the lightning activity is present (“YES” in S106), the determination unit 122 identifies the lightning risk target facility candidate corresponding to the lightning risk area determined to have the lightning activity as the lightning risk target facility. On the other hand, when there is no determination result of lightning activity (“NO” in S106), the determination unit 122 sets the lightning risk target facility corresponding to the lightning risk area as out of target (S105). .
In this manner, the identification unit 120 identifies a lightning risk target facility based on the determination result of the lightning activity.

When the lightning risk target facility is specified by the identification unit 120, as shown in FIG. 5, the execution unit 130 performs another data communication function of the lightning risk target facility for another lightning risk region where no lightning strike has occurred. A lightning strike avoidance operation is executed to replace the facility or another communication facility corresponding to the lightning risk area determined to have no lightning activity (S13).
For example, based on the information regarding the connection state of the communication facilities 30-1 to 30-n stored in the storage unit 140, among the communication facilities linked to the communication facility 30-n identified as the lightning risk target facility The data transmission function of the communication facility 30-n is substituted for the communication facility corresponding to the lightning strike risk area determined as having no lightning activity.

When the lightning strike avoidance operation is executed, the determination unit 122 determines whether or not lightning activity continues (S14). For the determination of lightning activity, if a lightning strike signal is received within a certain period of time after the determination signal indicating that there is lightning activity is output, it is determined that lightning activity continues and the output of the determination signal is maintained. . On the other hand, if a new lightning signal cannot be received after a lapse of a certain time since the last lightning signal was received, it is determined that the lightning activity has ended.
For example, as shown in FIG. 7, when a new lightning strike signal is received within a predetermined time B (for example, 10 minutes) after the decision signal is output, the output of the decision signal is maintained, and finally the lightning strike If a new lightning strike signal cannot be received even after a predetermined time B has elapsed since the signal was received, the output of the determination signal is stopped.

  If it is determined that the lightning activity is continuing (“YES” in S14), the determination unit 122 continues to determine whether the lightning activity is continued, and if it is determined that the lightning activity is completed (“NO” in S14). The execution unit 130 terminates the lightning strike avoidance operation performed for the communication equipment specified as the lightning risk target equipment (S15), cancels the setting as the lightning risk target equipment, and performs the normal data transmission function. To recover.

  Thus, according to the lightning strike risk avoidance system according to the present embodiment, the lightning strike risk area associated with each of the communication facilities in which lightning strikes continuously is detected, and this lightning strike risk area is handled. By identifying a communication facility as a lightning risk target facility and substituting the communication facility's data transmission function with a communication facility that is not a lightning risk target facility, avoiding lightning damage to the communication facility due to a lightning strike It is possible to prevent interruption of communication service due to lightning.

  Also, communication facilities corresponding to the lightning strike risk area where lightning strikes are extracted as lightning risk target equipment candidates, and continuous lightning strikes (lightning strike activities) are monitored in the lightning strike risk area of the extracted lightning risk target equipment candidates. By determining the presence or absence of lightning activity, and identifying and canceling lightning risk target equipment based on the determination results, it is possible to ignore single lightning strikes and prevent unnecessary lightning risk avoidance operations from being performed. When the activity ends, the lightning risk avoidance operation is terminated and the normal data transmission function can be promptly restored. Therefore, lightning damage to communication facilities can be avoided according to the frequency of lightning strikes, and flexible communication services can be provided.

[Second Embodiment]
The lightning strike avoidance system according to the second embodiment of the present invention is transmitted by a communication device corresponding to a lightning strike risk area identified as having lightning strike activity in the lightning strike avoidance system described in the first embodiment. The content of the lightning risk avoidance operation is selected based on the data communication quality.
In addition, about the component of the lightning strike avoidance system concerning this Embodiment, what has the structure and function similar to the component of the lightning strike avoidance system 100 demonstrated in 1st Embodiment attaches | subjects the same code | symbol. Detailed description thereof will be omitted.

  FIG. 8 is a block diagram showing the configuration of the lightning strike avoidance system according to the present embodiment. As shown in FIG. 8, the lightning strike avoidance system 200 according to the present embodiment includes an acquisition unit 110, an identification unit 120, an execution unit 230, and a storage unit 140, and the identification unit 120 is an extraction unit 121. And the determination unit 122, and the execution unit 230 includes an operation selection unit 231 and an operation execution unit 232.

The operation selection unit 231 of the execution unit 230 includes a lightning strike risk out of the lightning risk avoidance operations based on the communication quality of data transmitted by the communication facility corresponding to the lightning strike risk area identified as having lightning strike activity by the identification unit 120. Avoidance route determination operation to determine an avoidance route for transmitting data transmitted through the communication equipment specified as the target equipment while avoiding the communication equipment, or data transmission by the communication equipment specified as the lightning risk target equipment One of the transmission capacity limit value determining operations for determining the capacity limit value is selected.
The operation execution unit 232 of the execution unit 230 executes transmission control of data transmitted through the communication facility specified as the lightning risk target facility according to the lightning strike avoidance operation selected by the operation selection unit 231.

  It should be noted that each component of the lightning strike avoidance system 200 according to the present embodiment includes a computer program (a computer program (CPU), a memory, and an interface installed in the communication control management center 20 of the communication network system). The various functions of the lightning strike avoidance system 200 described above are realized by the cooperation of various hardware resources of the computer and the computer program.

Next, the operation of the lightning strike avoidance system 200 according to the present embodiment will be described with reference to the flowchart shown in FIG.
As illustrated in FIG. 9, the lightning strike avoidance system 200 identifies the communication equipment 30-n that is a lightning risk target equipment as described in the first embodiment (S <b> 21).

  When the communication facility 30-n that is a lightning risk target facility is specified, the operation selection unit 231 of the execution unit 230 is defined by data transmitted through the communication facility 30-n that is a lightning risk target facility. A communication quality level is identified, and it is determined whether or not this communication quality level matches a preset communication quality level condition (S22).

Here, the communication quality level prescribed | regulated to the data transmitted via communication equipment 30-n can be determined by the degree which ensures reception of data, for example. Specifically, the communication quality level of data for which it is indispensable to secure and transmit a predetermined communication band is defined as a high level, and it is not always necessary to secure and transmit a predetermined communication band The communication quality level can be defined as a low level.
When the communication quality level of the data is defined in this way, the operation selecting unit 231 identifies the communication quality level of the data transmitted via the communication equipment 30-n that is the lightning risk target equipment, and the communication quality. Determine whether the level is high.

  When the communication quality level of the transmission data matches the preset communication quality level condition, that is, when the communication level is high (“YES” in S22), the operation selection unit 231 performs the avoidance route determination operation. When the communication quality level of the transmission data does not match the preset communication quality level condition (“NO” in S22), the operation selection unit 231 performs the transmission capacity limit value determination operation. Is selected and executed (S24).

<About avoidance route determination operation>
The risk avoidance route determination operation executed when the avoidance route determination operation is selected by the operation selection unit 231 will be described with reference to FIGS.
FIG. 10 is a diagram conceptually illustrating an example of a risk avoidance route setting method. As shown in FIG. 10, the setting of the risk avoidance route means that the link between the communication facility 30-j and the communication facility 30-k relayed by the communication facility 30-i that is the lightning risk target facility is the lightning risk target. It is to switch to another route that does not go through the communication facility 30-i that is a facility. In an actual communication network, setting an avoidance route corresponds to using an empty optical fiber (dark fiber) or a metal cable (dry copper).

Such risk avoidance routes are the same as the number of elements in the matrix with rows and columns of all the communication facilities 30-j and the communication facilities 30-k relayed by the lightning risk target facilities. Will exist. Such a matrix is referred to as a route matrix of the communication facility 30-i. FIG. 11 shows an example of the route matrix Ri of the communication facility 30-i.
Since the route matrix Ri of the communication facility 30-i can be determined based on the connection status of the communication network, the route matrix Ri is derived based on the information regarding the connection status of the communication facilities 30-1 to 30-n stored in the storage unit 140.

  A flowchart showing the route matrix derivation operation is shown in FIG. As illustrated in FIG. 12, the operation selection unit 231 identifies the lightning risk target facility communication facility 30-i from which the route matrix is derived among the lightning risk target facilities identified by the identification unit 120 (S <b> 211).

When the communication facility 30-i for deriving the route matrix is specified, the communication facility 30-j at one end is selected (S212) from the communication facilities at both ends where there is a link with the communication facility 30-i, and the communication facility at the other end is selected. 30-k is selected (S213).
When the communication equipment 30-j and the communication equipment 30-k at both ends having a link with the communication equipment 30-i are selected, a route that links the communication equipment, that is, a risk avoidance route Ri (j, k) is extracted ( S214).

It is determined whether or not all the corresponding risk avoidance routes are extracted for the extracted risk avoidance route Ri (j, k) (S215), and the operations from S211 to S214 described above are performed until all risk avoidance routes are extracted. Repeat (“NO” in S215). On the other hand, when all risk avoidance routes are extracted (“YES” in S215), the route matrix Ri of the communication equipment 30-i is stored in the storage unit 140 (S216).
The route matrix derivation operation described above is executed when the avoidance route determination operation is selected by the operation selection unit 231. However, the route matrix for all communication facilities is periodically derived to obtain the latest route matrix. It may be managed as a database in the storage unit 140, and the latest route matrix of the communication facility 30-i that is a lightning risk target facility may be selected from the database.

  In addition, when communication facilities as lightning strike risk target facilities for deriving a route matrix occur at the same time, the derived route matrix is a communication that is a lightning risk target facility on the route matrix corresponding to each communication facility. It is only necessary to omit elements that are the same link destination (j, k) of equipment, and the respective risk avoidance routes may be routes that do not pass through lightning risk target equipment.

<Transmission capacity limit value determination operation>
The limit value determining operation for limiting the transmission capacity that is executed when the operation selecting unit 231 selects the transmission capacity limit value determining operation will be described with reference to FIGS. 13 and 14.
FIG. 13 is a diagram conceptually illustrating an example of a limit value setting method for limiting the data transmission capacity of the communication facility 30-n. As shown in FIG. 13, a lightning strike frequency (hereinafter referred to as “lightning strike frequency level”) represented by the number of lightning strikes per unit time in the lightning strike risk area of the communication equipment specified as the lightning strike target equipment is derived. Thus, a limit value can be set according to the lightning strike frequency level.

  Specifically, as shown in FIG. 13, the limit value for limiting the data transmission capacity is set to 1 to 1/3 for the communication equipment corresponding to the lightning strike risk area where the lightning strike frequency level is derived as 3. For a communication facility corresponding to a lightning strike risk area with a lightning strike frequency level of 2, a limit value for limiting the data transmission capacity is set to 1 to 1/2. Here, the higher the lightning strike frequency level, the more lightning strikes per unit time. In addition, the limit value of the data transmission capacity of the communication facility indicates that 1 is in the normal state (the transmission capacity is not limited), and 1/2 limits the data transmission capacity from the normal state to 1/2. 1/3 indicates that the data transmission capacity is limited to 1/3 from the normal state.

  As shown in FIG. 13, by setting a higher limit value that limits the transmission capacity of data for communication facilities corresponding to a lightning risk area with a higher lightning frequency level, communication packets transmitted through a communication network have a higher capacity. Select a transmission route that goes through many routes. That is, it is possible to reduce the amount of communication packets that pass through the communication facility corresponding to the lightning strike risk area with a high lightning strike frequency level.

FIG. 14 is a flowchart showing the transmission capacity limit value determination operation. As illustrated in FIG. 14, the operation selection unit 231 extracts the communication facility of the lightning risk target facility specified by the identification unit 120 (S221).
The operation selection unit 231 derives a lightning strike frequency level represented by the number of lightning strikes per unit time in the lightning strike risk area associated with the communication equipment of the lightning strike target facility (S222), and according to the lightning strike frequency level. A limit value for limiting the data transmission capacity is set (S223).

When the lightning risk avoiding operation is selected by the operation selecting unit 231, as illustrated in FIG. 9, the operation executing unit 232 executes transmission control of data corresponding to the lightning strike avoiding operation selected by the operation selecting unit 231. (S25).
For example, when the avoidance route determination operation is selected by the operation selection unit 231, the operation execution unit 232 applies the derived route matrix to the lightning risk target facility and all the communication facilities at both ends where the lightning risk target facility has a link. The data transmission function of the lightning risk target equipment is replaced with the communication equipment at both ends having a link with the lightning risk target equipment by designating the risk avoidance route.
Further, when the transmission capacity limit value determination operation is selected by the operation selection unit 231, the operation execution unit 232 sets the limit value set according to the lightning strike frequency level of the lightning strike risk area associated with the lightning strike risk target facility. Reflect in the communication network.

  When the data transmission control corresponding to the lightning risk avoiding operation is executed, the determination unit 122 determines whether or not the lightning activity is continued (S26). If it is determined that the lightning activity is continuing (“YES” in S26), the determination unit 122 continues to determine whether the lightning activity is continued, and if it is determined that the lightning activity has ended (“NO” in S26). ), The execution unit 230 ends the data transmission control corresponding to the lightning strike avoidance operation performed for the communication equipment specified as the lightning risk target equipment (S27), and cancels the setting as the lightning risk target equipment. The normal data transmission function is restored.

As described above, according to the lightning strike avoidance system according to the present embodiment, it is possible to provide a detailed communication service by selecting the lightning strike avoiding operation according to the communication quality level of the transmission data.
In other words, for data with a high communication quality level of transmission data, data transmission through a risk avoidance route that is a transmission route that avoids communication facilities of lightning risk target facilities is immediately executed before damage due to lightning damage occurs. Therefore, it is possible to prevent interruption of communication services, and for data of other communication quality levels, by limiting the data transmission capacity of the communication equipment of the lightning risk target equipment, equipment failure due to lightning damage, etc. Even when a failure occurs, data damage can be reduced to a minimum, and communication service damage can be minimized.

  In the above-described embodiment of the present invention, the communication management center 20 of the communication network system as shown in FIG. 1 has been described as having a lightning strike avoidance system, but the communication equipment 30 of the communication network system shown in FIG. The same effect can be obtained when each of -1 to 30-n has the functions of the lightning strike risk avoidance system of the present invention described above.

  It can be used as a lightning damage prevention system in a maintenance management system of a communication service provider that provides various communication services.

  DESCRIPTION OF SYMBOLS 10 ... Communication network, 20 ... Communication control management center, 30-1-30-n ... Communication equipment, 100, 200 ... Lightning strike risk management system, 110 ... Acquisition part, 120 ... Identification part, 121 ... Extraction part, 122 ... Determination , 130, 230 ... execution unit, 231 ... operation selection unit, 232 ... operation execution unit, 140 ... storage unit.

Claims (10)

An acquisition unit for acquiring lightning strike information indicating the occurrence of lightning strikes from outside;
Among the lightning strike risk areas that are preset for each of the communication facilities from the lightning strike information acquired by the acquisition unit, an identification unit that identifies the lightning strike risk area where lightning strike activity has occurred,
The data transmission function of the communication facility corresponding to the lightning strike risk area identified as having lightning strike activity by the identification unit is applied to a communication facility other than the communication equipment corresponding to the lightning strike risk area identified as having lightning strike activity. A lightning strike avoidance system comprising: an execution unit that executes a lightning strike avoidance operation to be substituted. The identification unit is
An extraction unit for extracting the lightning strike risk area where a lightning strike has occurred based on the lightning strike information acquired by the acquisition unit;
The lightning strike risk avoidance system according to claim 1, further comprising: a determination unit that determines that lightning strike activity is present when lightning strikes are continuously generated within the lightning strike risk area extracted by the extraction unit. The execution unit is
Based on the communication quality required for the data transmitted by the communication equipment corresponding to the lightning strike risk area identified as having lightning strike activity by the identification unit, the data to avoid the communication equipment in the lightning strike avoidance operation. An operation selection unit for selecting either an avoidance route determination operation for determining an avoidance route for transmitting the data, or a transmission capacity limit value determination operation for determining a limit value of the data transmission capacity by the communication facility;
The lightning strike risk avoidance system according to claim 1, further comprising an operation execution unit that executes transmission control of the data according to the lightning strike avoidance operation selected by the operation selection unit.   The operation selecting unit identifies a communication quality level defined in data transmitted by communication equipment corresponding to the lightning risk area identified as having lightning activity by the identifying unit, and a condition of a predetermined communication quality level 4. The lightning strike risk avoidance system according to claim 3, wherein the avoidance route determination operation is selected when it matches, and the transmission capacity limit value determination operation is selected otherwise.   The said execution part complete | finishes the said lightning risk avoidance operation | movement currently performed with respect to the said communication equipment when the completion | finish of the lightning strike activity in the said lightning risk area | region is identified by the said identification part. Thunderbolt risk avoidance system in any one of thru | or 4.   The identifying unit identifies that the lightning activity has ended if the lightning strike is not recognized even after a predetermined time has elapsed since the last lightning strike was recognized within the lightning strike risk area identified as having lightning activity. The lightning strike avoidance system according to any one of claims 1 to 5. An acquisition step of acquiring lightning strike information indicating the occurrence of lightning strikes from outside;
An identification step for identifying the lightning risk area where lightning activity has occurred, among lightning risk areas that are preset for each of the communication facilities from the lightning information acquired by the acquisition step;
The data transmission function of the communication facility corresponding to the lightning strike risk area identified as having lightning strike activity by this identification step, the communication equipment other than the communication equipment corresponding to the lightning strike risk area identified as having lightning strike activity A lightning strike avoidance method comprising: an execution step of executing a lightning strike avoidance operation to be substituted for. The execution step includes:
Based on the communication quality of the data transmitted by the communication facility corresponding to the lightning strike risk area identified as having lightning strike activity in the identification step, the communication facility avoids the communication facility and transmits the data. An operation selection step of selecting either an avoidance route determination operation for determining an avoidance route to perform or a transmission capacity limit value determination operation for determining a limit value of the data transmission capacity by the communication facility;
The lightning risk avoidance method according to claim 7, further comprising an operation execution step of executing transmission control of the data according to the lightning risk avoidance operation selected in the operation selection step.   8. The lightning risk avoidance operation that is being executed for the communication equipment is terminated when the lightning activity end in the lightning risk area is identified by the identifying step. Or the lightning strike avoidance method according to 8.   In a communication network system comprising the communication facility for transmitting data via a communication network and a management device connected to the communication network and performing operation management of the communication facility, at least the communication facility and the management device; A communication network system comprising the function of a lightning strike avoidance system according to any one of claims 1 to 6 in any one of the above.

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