JP5380486B2 - Communication system, network device, and management method - Google Patents

Description

Embodiments described herein relate generally to a communication system including a plurality of base stations , a network device, and a management method.

  Existing circuit switched networks are being replaced by IP (Internet Protocol) networks. In such a technological trend, communication carriers have been promoting communication IP / optical communication, and the number of IP telephone subscribers is increasing year by year. A next-generation IP (Internet Protocol) network technology called NGN (Next Generation Network) is also attracting attention. In such a flow, as represented by cloud technology, there is an increasing demand to freely distribute network devices on an IP network.

  By the way, in order to smoothly operate a communication network, it is necessary to monitor a device (network device) connected to the network and manage the state of each device. Correspondence between a device (monitoring device or control device) responsible for monitoring control and a device (monitored device) to be monitored and controlled is the main procedure. Traditionally, this procedure has been performed manually by a network operator, and there is an invention that can automate this procedure.

  According to the above-described invention, there is an advantage that the distributed communication system can be easily expanded by reducing the load on the operator. On the other hand, it is conceivable that a large number of monitored devices are concentrated under a specific monitoring device. This tendency is expected to increase especially in urban areas. Therefore, a technique capable of reducing the load on the monitoring device is desired.

JP 2003-199136 A

In a system that automates the association between the monitoring device and the monitored device, there may be a case where a monitoring device with a heavy load occurs, which may cause an unexpected trouble, and some measures are required to operate the system smoothly. ing.
It is an object of the present invention to provide a communication system , a network device, and a management method that can distribute the load of the monitoring apparatus and thereby facilitate smooth operation.

According to the embodiment, the communication system includes a plurality of control devices for connecting the plurality of base stations, a base station connected to a communication network, a management system for managing a plurality of control devices, is distributed to the communication network A plurality of network devices. Each of the plurality of network devices includes a wireless connection unit, a request unit, and an interface unit . The wireless connection unit wirelessly connects to a connectable base station via a wireless line . The request unit transmits a registration request message for requesting association with the control device to the management system via the base station connected by the wireless connection unit and the control device that connects the base station to the communication network. The interface unit connects a communication line different from the wireless line to the communication network. The management system includes an association unit, a determination unit, and an update unit. The association unit associates , by default, the network device to which the request unit has transmitted the registration request message and the control device through which the registration request message has passed. The determination unit determines the load on the plurality of control devices. The update unit updates individual associations between the plurality of network devices and the plurality of control devices based on the load based on the determination result of the determination unit. Each of the plurality of control devices includes a monitoring unit. The monitoring unit monitors network devices associated with the management system.

1 is a system diagram showing a communication system according to an embodiment. FIG. 2 is a functional block diagram showing an embodiment of network devices 501, 502, and 503 shown in FIG. 1. The functional block diagram which shows one Embodiment of the management system 400 shown by FIG. The figure which shows an example of the management table 44a shown by FIG. The functional block diagram which shows an example of the control apparatus concerning embodiment. The figure which shows an example of the hierarchical structure of the management in the communication system shown by FIG. The figure which shows an example of the form of management in the communication system shown by FIG. The sequence diagram which shows an example of the procedure at the time of the network device 503 being connected to a system. The figure which shows the relationship between a base station management area and a control apparatus management area. The figure for demonstrating an example of the load distribution between control apparatuses. The figure which shows an example of the load of control apparatus G11, G12, G13. The sequence diagram implemented at the time of load distribution of the monitoring function concerning embodiment. The figure for demonstrating an example of the procedure which determines the control apparatus used as the transfer destination of a monitoring function. FIG. 14 is a diagram for explaining an existing management method for comparison.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings. This embodiment will be described assuming a PHS (Personal Handy phone System). In addition, the embodiment can also be applied to a cellular phone system known as a so-called mobile phone system or an XGP (eXtended Global Platform) called a next generation PHS.

  FIG. 1 is a system diagram showing a communication system according to the embodiment. This system is formed with the communication network 100 and the control devices G11 and G12 connected to the communication network 100 as the core. The communication network 100 is, for example, a private network of a carrier, and specifically, a packet communication network such as an IP (Internet Protocol) network, an IP-VPN (IP-Virtual Private Network) connection service, or an ISDN (Integrated Service Digital Network). Etc.

  The communication network 100 may be connected to the Internet 300 via the gateway 200. The communication network 100 is provided with a management system 400 for remotely controlling the control devices G11 and G12 from a remote location and providing various communication services. In addition, the management system 400 includes a database 44 and also functions as a higher-level device for managing monitored devices existing in the system.

  That is, the management system 400 is positioned in the upper hierarchy of the control devices G11 and G12, and manages or monitors and controls the communication system based on notifications from the control devices G11 and G12. One of the functions is, for example, a failure management function for managing a failure occurrence state in each device in the communication system. The network management protocol applicable to the system of FIG. 1 includes CMIP (Common Management Information Protocol) or SNMP (Simple Network Management Protocol), but is not limited to these protocols.

  The control device G11 is connected to the base station CS11 via an individual line. The control device G12 is connected to the base stations CS21 and CS22 via another individual line. That is, the base station CS11 is under the control device G11, and the base stations CS21 and CS22 are under the control device G12. Although not shown, each of the control devices G11 and G12 can be connected to more base stations (the codes are unified by CS). Any of the control devices G11 and G12 connects the connected base station to the communication network 100. Further, the number of control devices is not limited to two and may be more than that. In the embodiment, the control device is shown with reference numerals such as G11, G12, and G13 (displayed after FIG. 10).

  Each base station CS11, CS21, CS22 forms a radio zone (hereinafter referred to as a cell) and accommodates mobile terminals PS (PS11, PS12) located in this cell via a radio channel. As the mobile terminals PS11 and PS12 move, they hand over each cell and switch the connection destination base station CS.

  The control devices G11 and G12 can also form a communication link between each other via the communication network 100, and the mobile terminals PS11 and PS12 can communicate with each other via this link. Furthermore, it is possible to access the Internet 300 via the gateway 200.

  The control devices G11 and G12 perform various controls such as exchange processing or protocol conversion between opposing devices (such as the gateway 200 and the control device of the communication partner) in order to realize end-to-end communication between communication terminals. Bear. The control devices G11 and G12 specify signals (digital signals such as audio data, video and image data, data for performing various services, etc.) communicated via the base station CS via the communication network 100. Process according to the communication type.

  Incidentally, the system shown in FIG. 1 includes network devices 501, 502, and 503 connected to the communication network 100 via wired or wireless communication. The network devices 501, 502, and 503 are distributed in the communication network 100 and are positioned as lower layers in system management and function as monitored devices.

  The network devices 501 and 503 are, for example, access points provided in the user's home 600, and the network device 502 is, for example, a wireless board provided in a notebook computer having a wireless communication function. In short, the network device is a device that can be directly or indirectly connected to the communication network 100. The network devices 501, 502, and 503 have a function of connecting to the base station CS via a wireless channel, and can communicate with the communication network 100 via a connection destination base station.

  1 includes a relay unit 700 for connecting a personal computer (PC) or a fixed telephone (TEL) to the control devices G11 and G12. The relay unit 700 is also a network device. This type of device is sometimes referred to as a terminal adapter (TA). If voice call software is installed on a PC, it can be used as a telephone. Furthermore, an access point (not shown) compliant with a wireless LAN (Local Area Network) standard may be connected to the control devices G11 and G12.

  FIG. 2 is a functional block diagram showing an embodiment of the network devices 501, 502, and 503 shown in FIG. The network devices 501, 502, and 503 include a network interface unit 51, a control unit 52, and a wireless unit 53 that are connected to the communication network 100. The radio unit 53 forms an individual radio channel with the base station CS that is in the service area via the antenna 54, and wirelessly connects to the base station CS.

By the way, the control part 52 is provided with the request part 52a and the response part 52b as a processing function concerning this embodiment. The request unit 52a transmits a registration request message to the management system 400 via the connection destination base station CS and the control device that connects the base station CS to the communication network 100. For example, a registration request message sent from the network device 503 reaches the management system 400 from the base station CS22 via the control device G12.
The response unit 52b returns a response message to the survival confirmation message (such as a KeepAlive message or a Ping inquiry message) transmitted from the control apparatus to the control apparatus that has transmitted the survival confirmation message.

  FIG. 3 is a functional block diagram showing an embodiment of the management system 400 shown in FIG. The management system 400 includes a network interface unit 41, a display unit 42, an input / output unit 43, a database unit 44, and a main control unit 45. The interface unit 41 performs interface processing related to communication with the communication network 100.

  The display unit 42 provides a user interface together with the input / output unit 43 to construct a GUI (Graphical User Interface) environment. The database unit 44 is a storage device such as a hard disk drive, and stores a management table 44a.

By the way, the main control unit 45 includes an association unit 45a, a determination unit 45b, an update unit 45c, an acquisition unit 45d, a setting unit 45e, and an instruction unit 45f as processing functions according to this embodiment.
The associating unit 45a determines which control device each network device is under monitoring. This determination is performed when the registration request message sent from the network device reaches the management system 400. Specifically, the associating unit 45a associates, by default, the network device that is the transmission source of the registration request message under the control of the control device through which the registration request message has passed. This association is centrally managed in the management table 44a.

  The determination unit 45b determines individual loads of a plurality of control devices based on the result of communication using, for example, a polling message. The update unit 45c updates the individual association between the network device and the control device based on the load determination result by the determination unit 45b. That is, the update unit 45c reassociates the network device that is the transmission source of the registration request message, for example, under the control of a control device other than the control device through which the registration request message has passed, based on the measured load of the control device. . Accordingly, the contents of the management table 44a are updated.

  For example, the updating unit 45c reassociates at least a part of the network device associated with the control device having a load equal to or greater than a predetermined threshold with the control device having the load equal to or less than the predetermined value. Further, for example, the updating unit 45c reassociates at least a part of the network device associated with the control device having a load equal to or greater than a predetermined threshold with the control device serving the sparsely populated area.

  For example, a rural area, a fishing village, a mountain village, or an area where communication infrastructure is insufficient is assumed as a sparsely populated area. In such an area, the number of network devices is smaller than in a densely populated area, and the load on the control device may not be high. Under such an assumption, the updating unit 45c may update the association based on the position information of the control device or the network device. Alternatively, the updating unit 45c determines at least a part of the network devices associated with the control device whose number of associated network devices is equal to or greater than a predetermined threshold, and the number of associated network devices is equal to or less than the predetermined value. You may make it match with a control apparatus again.

  Further, each CPU (Central Processing Unit) resource of the control device is measured, and for example, using the CPU usage rate as an index, the updating unit 45c is a network associated with the control device whose usage rate is equal to or higher than a predetermined threshold. At least a part of the device may be associated with a control device whose CPU usage rate is equal to or less than a predetermined value.

The acquisition unit 45d acquires the location information of the area that each of the control devices is responsible for. In acquiring the position information, for example, information related to the position registration of the network device may be referred to, or GPS (Global Positioning System) may be directly used.
For example, the setting unit 45e provides a GUI (Graphical User Interface) environment to the operator, and sets at least one of the threshold value and the specified value used for updating the management table 44a individually for each of a plurality of control devices. Used.

  The instruction unit 45f receives the update of the association between the network device and the control device by the update unit 45c, and executes a process for transferring the monitoring authority of the network device by the control device. That is, the instruction unit 45f changes the monitoring authority of the network device related to the update from the control device associated with the network device before the update to the control device (here, the transfer destination) associated with the network device after the update. An instruction message for transfer to the control device is transmitted to the control device related to the update. In the embodiment, it is assumed that the instruction message is first transmitted from the management system 400 to a control device that is a delivery destination.

  FIG. 4 is a diagram illustrating an example of the management table 44a illustrated in FIG. The management table 44a shows, for each control device, the correspondence between the base station that is the monitoring target and the network device that is the monitoring target. For example, it is indicated that the network device 501 is a monitoring target of the control device G12. FIG. 4 shows that the base station CS11 is monitored by the control device G11, and the base stations CS21 and CS22 are monitored by the control device G12. In the embodiment, the association between the control device and the network device is dynamically changed based on, for example, the load of the control device.

  FIG. 5 is a functional block diagram showing an embodiment of the control devices G11 and G12 shown in FIG. The same applies to other control devices described later. The control devices G11 and G12 include a network interface unit 21, a base station interface unit 22, and a CPU 23. The network interface unit 21 is connected to the communication network 100 and performs interface processing related to transmission / reception of IP packets and the like. The base station interface unit 22 is connected to a plurality of base stations CS and is responsible for interface processing related to communication with each base station CS.

Incidentally, the CPU 23 includes a monitoring unit 23a, a transmission unit 23b, a notification unit 23c, and a transfer unit 23d as processing functions according to this embodiment.
The monitoring unit 23a monitors and manages the subordinate base stations and network devices associated with the management system. That is, the monitoring unit 23a detects an abnormality that has occurred in the target network device, and notifies the management system 400 of the failure information.
The transmission unit 23b periodically transmits, for example, the survival confirmation message to be used for survival confirmation to the network device to be monitored. The notification unit 23c notifies the management system 400 of the result of the network device survival confirmation using the survival confirmation message.
The transfer unit 23d transfers the monitoring authority of the related network device in accordance with the instruction message transmitted from the management system 400. Next, the operation in this embodiment will be described.

  FIG. 6 is a diagram showing an example of a management hierarchical structure in the communication system shown in FIG. The base station CS is monitored as a subordinate by the directly connected control device. A management system 400 is located in the upper hierarchy of each control device G11, G12. The management system 400 monitors a plurality of control devices as subordinates, for example, in units of regions.

  FIG. 7 is a diagram showing an example of a management form in the communication system shown in FIG. In FIG. 7, the base station CS11 is connected to the control device G11, and the base station CS21 is connected to the control device G12. This corresponds to FIG. A network device connected to the communication network 100 via wireless is wirelessly connected to the base station CS11. Here, it is assumed that the network device 503 is connected to the communication network 100 via, for example, a wired connection and started up. Then, a procedure for connecting the network device 503 to the communication system is started.

  FIG. 8 is a sequence diagram illustrating an example of a procedure when the network device 503 is connected to the system. For example, at the initial startup, the network device 503 transmits a communication request to the base station CS 22 that is the destination (201). Receiving this, the base station CS22 returns a communication establishment response to the network device 503 (202). By the procedure so far, the network device 503 is wirelessly connected to the base station CS22.

Next, the network device 503 transmits a registration request message, that is, a management registration request to the management system 400 (203). This management registration request reaches the management system 400 via the base station CS22 (204) and the control device G12 (205).
Upon receiving the management registration request, the management system 400 associates, by default, the network device 503 that is the transmission source of the management registration request as a monitoring target of the control device G12 through which the management registration request has passed. In order to indicate the route information, a field for describing the ID (identification information) of the device that has passed may be provided in the management registration request.

When this association is completed, the correspondence relationship between the network device 503 and the control device G12 is newly described in the management table 44a. This is shown in the dotted line encircled area in FIG. Subsequently, the management system 400 returns a management registration response indicating that the management registration has been received to the network device 503 (206). In this management registration response, a parameter indicating a combination of the network device 503 and the control device G12 is described. This management registration response follows the reverse route, that is, via the control device G12 (207) and via the base station CS22 (208) to reach the network device 503. When the procedure so far is completed, monitoring of the network device 503 by the control device G12 is started (209).
When the network device 502 transmits a management registration request, this request reaches the management system 400 via the base station CS11 under the control of the control device G11, so that the network device 502 is set as a default under the control of the control device G11. It is registered with.

  One of the monitoring of network devices by a control device is survival confirmation. That is, the control device G12 transmits a survival confirmation message to the subordinate network device. Receiving this, the network device 503 returns a response message to the control device G12. If the response message is normally received by the control device G12, the control device G12 determines that the network device 503 is in a normal state. On the other hand, if the response message is not normally received by the control device G12, the control device G12 determines that a failure has occurred in the network device 503 and notifies the management system 400 to that effect. In response to this, the management system 400 performs necessary procedures such as issuing an alarm.

  FIG. 9 is a diagram illustrating the relationship between the base station management area and the control device management area. Base stations are arranged uniformly to support communication of mobile terminals, and the control device manages base stations in a certain area. The base station management area is the range where the transmission radio waves of the base station can reach. Further, an area where the ranges of transmission radio waves of the base station managed by the control device are integrated becomes the control device management area.

  Accordingly, the area where the network device is installed can be estimated based on the identification information of the base station to which the network device is connected or the identification information of the control device that manages the base station. The acquisition unit 45d of the management system 400 refers to such information, and acquires the location information of the area that each control device is responsible for.

  The network device searches for surrounding base stations at the time of initial installation, connects to the base station with the best communication status, and executes management registration. At that time, the control apparatus adds the information of the base station connected to the network device or the information of the control apparatus itself to the management registration request from the network device, and transfers it to the management system.

  The management system that has received the management registration request identifies each cover area from the database of the wireless communication system held by itself based on the base station information or the control device information included in the message, and determines the position of the network device. Register as information. This position information is referred to when updating the association between the network device and the control device by the updating unit 45c of the management system 400.

  FIG. 10 is a diagram for explaining an example of load distribution between control devices. Hereinafter, for example, control between the three control devices G11, G12, and G13 will be described. In FIG. 10, it is assumed that five control devices G11, nine control devices G12, and three control devices G13 are network devices. It is assumed that a network device is newly registered from this state under the control device G12.

  FIG. 11 is a diagram illustrating an example of loads on the control devices G11, G12, and G13. The management system 400 manages a plurality of control devices in an integrated manner, and holds the number of network devices associated with each control device as control device information. Each time a network device is registered for management, the management system 400 assigns a monitoring function to the control device that has performed the management registration by default.

  At that time, the management system 400 compares the number of network devices monitored by the control device with a threshold set in the management system. If the number of network devices is equal to or greater than the threshold or a predetermined number exceeding the threshold, the management system 400 determines that the load is high, determines the control device to which the monitoring function is transferred, and then loads the load by an instruction message. Direct distribution. This process is performed in response to the update of the association between the control device and the network device.

In FIG. 11, since the number of monitoring target devices of the control device G12 has changed from 9 to 10, the management system 400 detects that the threshold is (10) or more, and the monitoring load is distributed. . At this time, the CPU usage rate can also be referred to.
The threshold value and the prescribed value for determining the load status of the control device are given to the management system 400 as an initial setting when the system is started up. These values can be changed arbitrarily using the function of the setting unit 45e even during system operation. These values can also be set for each control device. For example, the control device in the urban area and the control device in the rural area may have different threshold values and specified values.
When referring to the CPU usage rate, the management system 400 periodically acquires the CPU usage rate of each control device. Thus, the management system 400 determines a control function transfer destination, that is, a control device to which the monitoring authority is transferred, for the control device whose CPU usage rate is equal to or greater than the threshold value, and instructs load distribution.

  Here, the number n of network devices that transfer a monitoring function from a high-load control device to another control device can be arbitrarily changed by setting. For example, when updating the association between a control device and a network device, each network device may be targeted, or two, three, or more network devices are collectively transferred to another control device. May be.

  FIG. 12 is a sequence diagram executed when distributing the load of the monitoring function according to the embodiment. In FIG. 12, the process for distributing the monitoring load is performed at the time of management registration of a new monitoring target network device (in this case, the network device 503) or when the CPU usage rate of the control device is acquired (S301). The management system 400 determines the load status of each control device (S302). For example, if it is determined that the load on the control device G12 is high, the control device to which the monitoring authority for at least some network devices under the control device G12 is transferred is determined. Here, it is assumed that G21 is selected as the control device of the transfer destination (delivery destination).

  Then, the management system 400 transmits a delivery preparation request as an instruction message to the control device G21 (S303). If the network device 503 can be accepted, the control device G21 returns a delivery preparation response to the management system 400 (S304). The management system 400 transmits a load distribution instruction including information on the control device G21 to the control device G12 (S305).

    Receiving this, the control device G12 transmits a monitoring function delivery request including information of the network device 503 to the control device G21 (S306). Upon receiving a monitoring function transfer response from the control device G21 in response to this request, the control device G12 transmits a monitoring device change notification to the network device 503 (S308, S309). When the sequence so far is completed, an operation related to the monitoring function is started between the delivery destination control device G21 and the network device 503 (S310).

FIG. 13 is a diagram for explaining an example of a procedure for determining a control device as a transfer destination of the monitoring function. Hereinafter, procedures (1) to (3) will be described as an example.
(1) The management system 400 detects, for example, the control device (G21) having the smallest load among the control devices geographically close to the high load control device (G12), and determines this control device G21 as the transfer destination of the monitoring authority. To do. Then, the high load control device G12 is instructed to transfer the monitoring function of the monitoring target network device to the control device G22. According to the above procedure, it is possible to transfer the monitoring function to a control device close to the network device. There are also the following procedures.

  (2) The management system 400 detects the monitoring dedicated control device G22 having only the monitoring function without managing the base station, and determines this control device G22 as the transfer destination of the monitoring authority. Then, the control device G12 is instructed to transfer the monitoring function of the monitoring target network device to the control device G22. According to the above procedure, frequent occurrence of the load distribution sequence can be suppressed by transferring the monitoring function to the monitoring dedicated control device. This is particularly effective between control devices installed in urban areas. There are also the following procedures.

  (3) The management system 400 detects the low load control device (G23) in the rural area, and determines this control device G23 as the transfer destination of the monitoring authority. Then, the control device G12 is instructed to transfer the monitoring function of the monitoring target network device to the control device G23. According to the above procedure, it is possible to suppress the frequent occurrence of the load distribution sequence by transferring the monitoring authority to a rural area where management registration of new network devices is expected to be small.

  In the embodiment, the management system 400 determines the control device to which the monitoring authority is transferred by any one of the procedures (1) to (3) or a combination of the procedures. And the load distribution instruction | indication containing the information of a transfer destination control apparatus is transmitted to a high load control apparatus (G12).

  As described above, in this embodiment, after the network device is connected to the base station being visited, the management registration request is transmitted from the network device to the management system. The management registration request reaches the management system from the base station via the control device. Upon receiving this, the management system associates, by default, the network device that is the registration request source with the control device that has passed the management registration request. Based on this correspondence, the control device starts monitoring the network device registered as the monitoring target.

  Furthermore, in the embodiment, the load of each control device is monitored, and an instruction is given to a control device with an increased load to transfer the monitoring authority for a part of the network device under the control device to another control device with a low load. give. In response to this, the related control device and network device execute processing for exchanging messages and transferring monitoring authority.

  FIG. 14 is a diagram for explaining an existing management method for comparison. In the existing communication system, the control apparatus needs to inquire the management system which network device is to be monitored. At that time, the association between the control device and the network device has to be set by an operator's manual operation, which places a heavy burden on the operator and makes it difficult to freely arrange the network device in the system. In addition, when network devices are concentrated in the coverage area of the base station, there is a problem that the monitoring load of the control apparatus increases.

  In contrast, in the embodiment, after a network device is wirelessly connected to a base station, a registration request to the management system 400 is performed via the control device immediately above. It is automatically determined whether to enter. In the embodiment, a network device is determined by default as a monitoring target of a control apparatus that monitors a base station to which the network device is connected. Since it did in this way, an operator's burden can be reduced and a network device can be freely distributed and arranged on a communication system. That is, the system can be easily expanded, and has a great merit when applied to a cloud system, for example.

In the embodiment, the management system 400 grasps the number of network devices managed by each control device or the CPU usage rate of each control device, and the control device determined to have increased the load is transferred to another control device. The network device monitoring instruction is given. Therefore, even when the network devices are freely arranged on the network, the combination of the control device and the network device is determined autonomously, and the load on the monitoring device is distributed even when the number of network devices increases. The This makes it possible to prevent a decrease in system performance. This also makes it possible to freely distribute network devices on the network and further facilitate system expansion.
As a result, the load on the monitoring apparatus can be distributed , and it is possible to provide a communication system , a network device, and a management method that can facilitate smooth operation.

  Although an embodiment of the present invention has been described, this embodiment is presented as an example and is not intended to limit the scope of the invention. The novel embodiment can be implemented in various other forms, and various omissions, replacements, and changes can be made without departing from the scope of the invention. This embodiment and its modifications are included in the scope and gist of the invention, and are included in the invention described in the claims and the equivalents thereof.

  DESCRIPTION OF SYMBOLS 100 ... Communication network, G11, G12 ... Control apparatus, 200 ... Gateway, 300 ... Internet, 400 ... Management system, 44 ... Database, CS (CS11, CS12, CS22) ... Base station, PS (PS11, PS12) ... Mobile terminal 501, 502, 503... Network device, PC ... personal computer, TEL ... fixed telephone, 600 ... user home, 700 ... relay unit, 51 ... network interface unit, 52 ... control unit, 52a ... request unit, 52b ... response unit 53 ... Radio unit 54 ... Antenna 41 ... Network interface unit 42 ... Display unit 43 ... Input / output unit 44 ... Database unit 44a ... Management table 45 ... Main control unit 45a ... Association unit 45b ... determination unit, 45c ... update unit, 45d ... acquisition unit, 5e ... setting unit, 45f ... instruction unit, 21 ... network interface unit, 22 ... base station interface unit, 23 ... CPU, 23a ... monitor, 23b ... transmitting unit, 23c ... notification unit, 23d ... transfer unit

Claims (17)

Multiple base stations,
A plurality of control devices connected to connected the base station to the communication network,
A management system for managing the plurality of control devices;
A plurality of network devices distributed in the communication network,
Each of the plurality of network devices is
A wireless connection unit for wireless connection to a base station connectable via a wireless line ;
A registration request message for requesting association with the control device is transmitted to the management system via a base station connected by the wireless connection unit and a control device that connects the base station to the communication network. A request section ;
An interface unit for connecting a communication line different from the wireless line to the communication network ;
The management system includes:
A mapping unit for associating the network device in which the request unit transmits the registration request message, and a control device via the registration request message by default,
A determination unit for determining a load of each of the plurality of control devices;
An update unit that updates individual associations between the plurality of network devices and the plurality of control devices based on the load based on the determination result of the determination unit ,
Each of the plurality of control devices is
A communication system comprising a monitoring unit that monitors network devices associated with the management system. The management system further includes:
An instruction message for transferring the monitoring authority of the network device related to the update from the control apparatus associated with the network device before the update to the control apparatus associated with the network device after the update. Including an instruction unit for transmission to the control device related to
The control device further includes:
The communication system according to claim 1, further comprising a transfer unit that transfers the monitoring authority in response to the instruction message.   2. The update unit according to claim 1, wherein the updating unit reassociates at least a part of the network device associated with a control device having the load equal to or greater than a predetermined threshold with a control device having the load equal to or less than a predetermined value. Communication system.   The communication system according to claim 3, wherein the updating unit reassociates at least a part of the network device associated with a control device having the load equal to or greater than a predetermined threshold with a control device serving a sparsely populated area. . The management system further includes an acquisition unit that acquires location information of a region that each of the control devices is responsible for,
The communication system according to claim 4, wherein the update unit updates the association based on the position information acquired by the acquisition unit.   The update unit includes at least a part of the network devices associated with a control device in which the number of associated network devices is equal to or greater than a predetermined threshold, and the number of associated network devices is equal to or less than a predetermined value. The communication system according to claim 1, wherein the communication system is re-associated with the control device. Each of the control devices includes a CPU (Central Processing Unit),
The updating unit reassociates at least a part of the network device associated with a control device having a CPU usage rate equal to or higher than a predetermined threshold with a control device having the CPU usage rate equal to or lower than a predetermined value. The communication system according to claim 1.   The communication system according to any one of claims 3 to 7, further comprising setting means for individually setting at least one of the threshold value and the specified value for each of the plurality of control devices. Each of the control devices includes a transmission unit that transmits a survival confirmation message for survival confirmation to a network device to be monitored,
The communication system according to claim 1, wherein each of the network devices includes a response unit that returns a response message to the survival confirmation message to a control device that is a transmission source of the survival confirmation message.   Each of the said control apparatus is a communication system of Claim 9 provided with the notification part which notifies the result of the said survival confirmation to the said management system. The management system includes:
The communication system according to claim 1, further comprising a management table that indicates association between the network device and a control device that monitors the network device. A plurality of base stations, a plurality of control devices connected to connected communication network said base station, provided in a communication system and a management system for managing a plurality of control devices, distributed to the communication network Network devices
A wireless connection unit for wireless connection to a base station connectable via a wireless line;
A registration request message for requesting association with the control device is transmitted to the management system via a base station connected by the wireless connection unit and a control device that connects the base station to the communication network. A request section;
A network device comprising: an interface unit that connects a communication line different from the wireless line to the communication network. The network device according to claim 12 , comprising a response unit that returns a response message to the survival confirmation message to a control device that is a source of the survival confirmation message for existence confirmation . A plurality of base stations, a plurality of control devices for connecting the connected base stations to a communication network, a management system for managing the plurality of control devices, and the communication network distributed and arranged in the communication network via a communication line A management method of a communication system comprising a plurality of network devices connected to
The network device is wirelessly connected to a base station connectable via a wireless line different from the communication line,
The network device transmits a registration request message requesting association with the control device to the management system via the connected base station and the control device that connects the base station to the communication network. And
The management system associates, by default, the network device that has transmitted the registration request message by the request unit with the control device that has passed the registration request message,
The management system determines a load on each of the plurality of control devices;
The management system updates individual associations between the plurality of network devices and the plurality of control devices based on the load based on the determination result,
A management method in which the control device monitors a network device associated by the management system. Further, the management system transfers the monitoring authority of the network device related to the update from the control device associated with the network device before the update to the control device associated with the network device after the update. Is sent to the control device related to the update,
The management method according to claim 14 , wherein the control device transfers the monitoring authority in response to the instruction message . The control device transmits a survival confirmation message for survival confirmation to the network device to be monitored,
The management method according to claim 14, wherein the network device returns a response message to the survival confirmation message to a control device that is a transmission source of the survival confirmation message. The management method according to claim 16, wherein the control device notifies the management system of a result of the survival confirmation.

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