JP2017195435A - Network access system, and control device therefor, channel backup control method and program - Google Patents

Abstract

PROBLEM TO BE SOLVED: To restrict the use of a radio network for another purpose than a backup use, with an appropriately secured band of a radio access channel to be used for backup.SOLUTION: In a backup control table of a database DB, there is stored in advance backup permission/non-permission information which represents the availability or non-availability in the event of a fault in a wired access device SS for each small-area radio base station BSA, BSF, a middle-area radio base station BSG and a large-area radio base station BSH, in which a user side device US exists in the radio area thereof. In the event of a fault in the wired access device SS, a control system device CS selects an available radio base station from each radio base station, on the basis of the backup permission/non-permission information. If the selected radio base station is operating normally, the user side device US is made accessible to an upper level network NW through the radio base station.SELECTED DRAWING: Figure 3

Description

  The present invention relates to a network access system for selectively connecting a user apparatus to a higher level network using a wired network and a wireless network, and a control apparatus, a line backup control method, and a program used in this system.

  A wired access network using an optical cable or the like is generally used as a network for accessing a host network such as the Internet from a user device. However, since it is assumed that the wired access network cannot be used due to a failure of the wired access device, the occurrence of a disaster, road construction, or the like, a backup line may be provided for this type of network.

  As a line backup method, for example, there is a method in which the wired access network itself is duplexed by duplexing optical fibers. However, duplicating all wired access lines leads to a significant increase in the cost of line facilities.

  On the other hand, a broadband wireless network such as a wireless local area network (LAN) or a cellular phone system has been widely used recently, and a system for backing up a wired access line using this wireless network has also been proposed. For example, in Patent Document 1, when a wireless network for backup is built by mounting a wireless relay station on a moored floating body, and a failure occurs in the line of the wired access network, the line of the wired access network Describes a technique for switching a wireless network line to a wireless network line and using the wireless network line as a detour path.

JP 2000-124910 A

  However, in the conventionally proposed system, there are no restrictions on the use of the wireless network. For this reason, if the user terminal is within a wireless area provided by the wireless network, the user terminal can be used unconditionally regardless of the presence or absence of a failure in the wired access network. That is, the wireless network can be used for purposes other than the purpose of backing up the wired access network. In addition, in order to back up a large number of lines of a wired access network with a wireless network, it is necessary to secure a plane band for all wireless base stations.

  The present invention has been made paying attention to the above circumstances, and restricts the use of the wireless network for purposes other than the backup use of the wired access network, and appropriately secures the bandwidth of the wireless access line used for the backup. A network access system, its control device, a line backup control method, and a program are provided.

  In order to solve the above problems, a first aspect of the present invention includes a wired access device that connects a user device to an upper network via a wired network, and a plurality of users that connect the user device to the upper network via a wireless network. A network access system comprising: a wireless access device; a control device connected to the wired access device and the plurality of wireless access devices; and a storage device installed in or connected to the control device. In association with the identification information of the user device, the device stores backup permission / rejection information indicating whether or not each of the plurality of wireless access devices is permitted to be used as a backup target of the wired access device. Then, the control device determines whether or not the wired access device can communicate with the upper network via the wired network when the user device performs communication. When it is determined that the access device is not in a state where the communication can be performed, a wireless access device that is permitted to be used as a backup target is selected based on the backup permission / rejection information stored in the storage device. The wireless access device is notified of the identification information of the user device so that wireless communication between the user device and the selected wireless access device is enabled.

  According to a second aspect of the present invention, the plurality of wireless access devices include first and second wireless access devices that can wirelessly communicate with the user device and have wireless areas of the same size. The storage device stores information that permits the use of the first wireless access device as a backup target of the wired access device in association with the identification information of the user device, and the first wireless access device. Information for permitting use of the second wireless access device is stored as a backup target. When the control device determines that the wired access device is not ready for the communication, the control device first selects the first wireless access device based on the information stored in the storage device. It is determined whether or not the selected first wireless access device is in a state where wireless communication can be performed. If it is determined that the first wireless access device is not in a state where wireless communication can be performed, the storage is performed. The second wireless access device is selected based on information stored in the device.

  According to a third aspect of the present invention, as the plurality of wireless access devices, wireless communication is performed between the first wireless access device having a wireless area capable of wireless communication with the user device and the user device. And a third wireless access device having a wireless area larger than the wireless area of the first wireless access device. The storage device stores information that permits the use of the first wireless access device as a backup target of the wired access device in association with the identification information of the user device, and also stores the information of the first wireless access device. Information for permitting use of the third wireless access device is stored as a backup target. When the control device determines that the wired access device is not ready for the communication, the control device first selects the first wireless access device based on the information stored in the storage device. When the first wireless access device is in a state where wireless communication can be performed and it is determined that the first wireless access device is not ready for wireless communication, The third wireless access device is selected based on the stored information.

  According to the first aspect of the present invention, when it is determined that the wired access device is not in a state where communication is possible, the wired access device is used as a backup target based on the backup permission information stored in advance in the storage device. A wireless access device permitted to be used is selected, and line backup is performed by the wireless access device. For this reason, even if a user device tries to access a higher level network using a device other than a specific wireless access device, the user device cannot be accessed, thereby restricting the use of the wireless network for purposes other than backup use. Can do.

  In addition, since the line backup is possible only by a specific wireless access device among a plurality of wireless access devices constituting the wireless network, a bandwidth corresponding to the bandwidth of the wired access device to be backed up is set to the specific wireless access device. Allocating only to the access device is sufficient, and as a result, it is not necessary to secure a plane band and the equipment cost can be reduced. By reducing the equipment cost, it becomes possible to widely deploy line backup of a wired network.

  According to the second aspect of the present invention, when a failure has occurred in the first radio access device selected first, the second radio access device is selected, and the second radio access device Line backup is performed. Therefore, even when a failure occurs in the wired access device and a failure occurs in a specific wireless access device, line backup can be performed by the second wireless access device.

  According to the third aspect of the present invention, when both the wired access device and the wireless access device in the area where the user device exists are damaged due to a disaster, for example, the third wireless access having a larger wireless area. A device is selected, and line backup is performed by the third wireless access device. That is, a wireless access device of another wireless network adopting a medium cell or large cell system is selected, and line backup is performed. For this reason, even if both the wired access device and the wireless access device in the area have failed due to a disaster or the like, line backup can be performed using the third wireless access device.

  That is, according to each aspect of the present invention, there is provided a network access system that restricts the use of a wireless network for purposes other than backup use of a wired access network and can appropriately secure a bandwidth of a wireless access line used for backup, The control device, line backup control method, and program can be provided.

The figure which shows the whole structure of the network access system which concerns on 1st Embodiment of this invention. The block diagram which shows the function structure of the control system apparatus used with the network access system shown in FIG. The flowchart which shows the process sequence and process content of the control system apparatus shown in FIG. The figure which shows an example of the positional relationship of a user side apparatus and a wireless base station. The figure which shows an example of the backup control table set in the case of the positional relationship shown in FIG. The figure which shows the more specific example of the positional relationship between a user side apparatus and a some radio base station. The figure which shows an example of the backup permission information set at the time of the positional relationship shown in FIG. 6, and a failure detection and control method. FIG. 2 is a diagram showing a basic sequence of line backup operation when a wired line is disconnected in the system shown in FIG. 1. The figure which shows the basic sequence of the line | wire backup operation at the time of wired recovery of the system shown in FIG. The figure which shows the sequence at the time of disaster by the system shown in FIG. The figure which shows the sequence at the time of a disaster when a failure generate | occur | produces in the specific radio base station in the system shown in FIG. The figure which shows the example of the communication band allocated between a user terminal, a wired access apparatus, and a wireless base station in the network access system which concerns on 2nd Embodiment of this invention. The figure which shows an example of the backup permission information used in the network access system which concerns on 2nd Embodiment of this invention, and a failure detection and control method. The figure for demonstrating the backup operation | movement of the network access system which concerns on 2nd Embodiment of this invention.

Embodiments according to the present invention will be described below with reference to the drawings.
[First Embodiment]
(Constitution)
FIG. 1 is a block diagram showing the overall configuration of a network access system according to the first embodiment of the present invention.
The network access system of the present embodiment includes a user-side device US to which a user terminal TM such as a personal computer or a home appliance is connected, and a wired connection connected to the user-side device US via a wired line SL using an optical fiber. A plurality of wireless base stations BSA, BSB,..., BSX as wireless access devices capable of communicating via a wireless line between the access device SS and the user side device US, the wired access device SS and the wireless device A control system device CS as a control device for controlling the base stations BSA, BSB,..., BSX and a database DB as a storage device connected to the control system device CS are provided.

  The user side device US includes, for example, a terminal adapter, and includes a control module 11, a wireless module 12, an antenna 13 connected to the wireless module 12, and a wired module 14.

  The wired module 14 includes a wired data line terminating device. When the user terminal TM transmits / receives Web data or mail to / from a Web site or mail server connected to an upper network NW such as the Internet, the wired module 14 transmits the data to the wired module 14. Transmit according to the protocol defined by the network.

  The wireless module 12 is composed of a wireless data line terminating device, and when the user terminal TM transmits / receives the Web data or mail, a predetermined protocol is transmitted between the wireless base stations BSA, BSB,. Send and receive.

  The control module 11 controls data transmission / reception by the wireless module 12 and the wired module 14 in response to a request from the user terminal TM.

  The wired access device SS is composed of, for example, a router or a gateway, and performs data transfer between the wired module 14 of the user device US and the upper network NW. The wireless base stations BSA, BSB,..., BSX comprise, for example, wireless LAN (Local Area Network) access points or mobile phone system base stations, and are connected to the user apparatus US by a wireless line. Data transfer is performed between the wireless module 12 of the user apparatus US and the upper network NW.

  The database DB stores a backup control table set in advance for each user. The backup control table is associated with identification information (hereinafter referred to as a user ID) of the user terminal TM or the user side device US, and for each of the plurality of radio base stations BSA, BSB,. It stores backup permission / rejection information indicating whether or not use is permitted as a backup target. FIG. 5 shows backup permission / inhibition information when the user side devices USα, USβ, USγ are present in the wireless areas EA to EX of the wireless base stations BSA to BSX as shown in FIG. .

  That is, in the backup control table, latitude / longitude information indicating the installation positions of the user side devices USα, USβ, USγ is preliminarily stored. Is set so that only the use of the radio base station is permitted and the use of other radio base stations is not allowed. Therefore, even if the user moves his / her user device US into the radio area of another radio base station, the radio base station cannot be used.

  A more specific example of the backup permission / rejection information is shown below. For example, as shown in FIG. 6, the user side device US exists in a small area formed by the wireless base stations BSA and BSF of the wireless LAN, and the wireless base stations BSG and BSH of other wireless networks such as a cellular phone system. Are also present in the middle and large areas formed respectively. In this case, the backup permission / rejection information includes, for example, as shown in FIG. 7A, identification information (wired access device ID) of the wired access device SS and identification information (user accommodation) of a specific radio base station BSA that forms a small area. Specific radio base station ID), identification information (provided area radio base station ID) of other radio base stations BSF that also form a small area, and identification of radio base stations BSG and BSH that form the above-mentioned medium area and large area In association with each of the information (user accommodating area radio base station ID and user accommodating large area radio base station ID), information indicating the operation status and availability of use for each operation sequence is set. The backup control table also stores identification information (wireless module ID) of the wireless module 12 included in the user side device US.

The control system apparatus CS has, for example, a CPU (Central Processing Unit) and is configured as follows. FIG. 2 is a block diagram showing the configuration.
That is, the control system device CS includes a control unit 21, a wired access device control module 22, a search unit 23, and a radio base station control module 24. Each of these functional units operates by causing the CPU to execute a program stored in a program memory (not shown).

  The wired access device control module 22 detects the operating status of the wired access device SS and notifies the control unit 21 of the detected result, and transmits control information output from the control unit 21 to the wired access device SS. Processing to output to SS is performed.

  The search unit 23 searches for a backup control table corresponding to the user side device US using the wired access device SS in which a failure has occurred, according to an instruction from the control unit 21, and performs processing for passing the stored information to the control unit 21. Do.

  The radio base station control module 24 instructs one of the radio base stations BSA to BSX to establish a radio connection with the radio module 12 of the user apparatus US according to an instruction from the control unit 21.

The control unit 21 has the following processing functions.
(1) Based on the detection result of the operating status of the wired access device SS notified from the wired access device control module 22, it corresponds to the user side device US connected to the wired access device SS where the failure has occurred. Processing for instructing the search unit 23 to search for a backup control table and acquiring storage information of the backup control table.

  (2) A process of selecting an available radio base station based on the acquired storage information in the backup control table.

  (3) It is determined through the radio base station control module 24 whether or not the selected radio base station is operating normally, and it is determined that the selected base station is operating normally. A process of instructing the selected radio base station to establish a radio connection with the user apparatus US from the radio base station control module 24.

  (4) If it is determined that the selected base station is not operating normally as a result of the determination, another small area radio base station is stored based on the storage information of the acquired backup control table. It is determined whether there is an available radio base station (provided area radio base station) in the station. When there is a service area radio base station, a process of instructing the service area radio base station from the radio base station control module 24 to establish a radio connection with the user apparatus US.

  (5) If it is determined that there is no available service area radio base station, the medium area radio base station and the large area radio base station are in this order based on the storage information of the acquired backup control table. It is determined whether there is an available radio base station. When an available medium area or large area radio base station is found, wireless connection between the radio base station control module 24 and the user side device US is made to the medium area or large area radio base station. Processing to indicate.

(Operation)
Next, the operation of the network access system configured as described above will be described according to the control procedure of the control system apparatus. FIG. 3 is a flowchart showing the control procedure and control contents.

(1) Basic sequence (when a wired access device fails)
The failure of the wired access device includes a network failure caused by a disconnection of the wired line SL and a failure transfer plan construction work of the wired access network. As shown in FIG. 7 (b), the former is detected by periodically conducting a continuity test by polling from the wired access device SS to the user side device US, and the detection result is transmitted from the wired access device SS to the control system device. The CS is notified. As for the latter, as shown in FIG.7 (b), in the control system apparatus CS, the user side apparatus US which influences the said period is extracted based on the trouble transfer construction plan memorize | stored beforehand.

FIG. 8 shows a sequence of a line backup operation when a line disconnection occurs in the wired line SL connecting the user-side apparatus US and the wired access apparatus SS.
When a line break (1) occurs in the wired line SL and this line break is detected (2) by the wired access device SS, the detection result is notified to the control system device CS (3). In step S1 of FIG. 3, the control system apparatus CS receives the line disconnection detection result by the wired access apparatus control module 22 together with the notification source wired access apparatus ID.

  Upon receiving the line disconnection detection result, under the control of the control unit 21, the control system apparatus CS first issues an instruction to the search unit 23 in step S2, and sets the wired access apparatus ID that is the notification source of the line disconnection detection result. As a key, backup permission / rejection information is read from the corresponding backup control table of the database DB (4). Next, in step S3, based on the read backup permission information, a specific radio base station BSA that can be used when the wired line is disconnected is selected, and the selected specific radio base station is sent to the radio base station control module 24. A connection request between the BSA and the wireless module 12 of the user apparatus US is given.

  Upon receiving the connection request, the radio base station control module 24 performs a process of confirming the operating status of the specific radio base station BSA in step S4, and whether the specific radio base station BSA is operating normally in step S5. Determine whether or not. As a result of this determination, if the specific radio base station BSA is operating normally, the radio base station control module 24 connects the radio module 12 of the user apparatus US to the specific radio base station BSA in step S6. Instruct (5).

  In response to the connection instruction, the specific radio base station BSA executes a procedure for establishing a radio link (6) with the radio module 12 of the user apparatus US in step S7. Thus, thereafter, the user apparatus US can transmit data such as Web information and mails to and from the upper network NW via the specific radio base station BSA.

Next, an operation when the line disconnection of the wired line SL is recovered will be described. FIG. 9 shows the operation sequence.
When the line disconnection of the wired line SL is recovered (1) and the recovery of the line disconnection is detected (2) by the wired access device SS, the detection result is notified to the control system apparatus CS (3). The control system apparatus CS receives the detection result of the line disconnection recovery together with the notification source wired access apparatus ID by the wired access apparatus control module 22.

  Upon receiving the detection result of the line disconnection recovery, the control system apparatus CS first issues an instruction to the search section 23 under the control of the control section 21, and uses the notification source wired access apparatus ID as a key to correspond to the database DB. The backup permission / rejection information is read from the backup control table to be executed (4). Next, based on the read backup permission information, it is determined whether or not the specific radio base station BSA can be used when the wired access device SS is in a normal state. Here, since the specific radio base station BSA is “unusable” as shown in FIG. 9, the radio module of the user side apparatus US from the radio base station control module 24 to the specific radio base station BSA. The disconnection instruction between 12 is transmitted.

  When receiving the connection disconnection instruction, the specific radio base station BSA executes a procedure for disconnecting the radio link with the user apparatus US. Thus, thereafter, the user apparatus US uses the wired module 14 to transmit data such as Web information and mail to and from the upper network NW via the wired access apparatus SS in which the disconnection of the wired line SL is restored. You can resume.

(2) Disaster sequence (when a failure occurs in both the wired access device and the small area radio base station)
For example, it is assumed that a failure occurs in a wired access network due to a disaster, and a failure occurs in a specific radio base station BSA that forms a small area. In this case, the control system apparatus CS operates as follows. FIG. 10 shows the state.

  As shown in FIG. 3, when the control system apparatus CS receives the line disconnection detection result from the wired access apparatus SS in step S1, the control system apparatus CS reads the backup permission / rejection information from the corresponding backup control table in the database DB in step S2. In S3 to S5, the operation of the specific radio base station BSA is confirmed. As a result, if it is determined that the specific radio base station BSA is also inoperable, the process proceeds to step S8.

  In step S8, the control system apparatus CS first determines whether or not the middle area radio base station BSG can be used based on the backup permission information by the radio base station control module 24. And if it can utilize, an operation condition will be determined about the radio | wireless base station BSG of the said middle area. As a result of the determination, if the radio base station BSG in the middle area is operating normally, the radio base station BSG in the middle area is instructed to connect to the radio module 12 of the user side apparatus US.

  Upon receiving the connection instruction, the radio base station BSG in the middle area receives a connection request from the user side device US and establishes a radio link with the radio module 12 of the user side device US of the request source. Perform the procedure. Thus, thereafter, the user apparatus US can transmit data such as Web information and mail to the upper network NW via the middle area radio base station BSG.

  On the other hand, it is assumed that the wireless base station BSG in the middle area is not operating normally due to the influence of a disaster. In this case, the control system apparatus CS determines whether or not the large area radio base station BSH is available based on the backup permission / rejection information. If it is available, the operating status is determined for the radio base station BSH in the large area. If the result of this determination is that the large area radio base station BSH is operating normally, the large area radio base station BSH is instructed to connect to the radio module 12 of the user apparatus US.

  Upon receiving the connection instruction, the radio base station BSH in the large area receives a connection request from the user side apparatus US and establishes a radio link with the radio module 12 of the user side apparatus US of the request source. Perform the procedure. Thus, thereafter, the user apparatus US can transmit data such as Web information and mail to and from the upper network NW via the large area radio base station BSH.

(3) Sequence when a specific radio base station fails (when a failure occurs in the wired access device and a specific small area radio base station, but there are other small area radio base stations that can be used)
Assume that a failure occurs in the wired access device SS, and that the specific radio base station BSA set as a radio base station that can be used in that case is also inoperable. In this case, the control system apparatus CS operates as follows. FIG. 11 shows the state.

  As shown in FIG. 3, when the control system apparatus CS receives the line disconnection detection result from the wired access apparatus SS in step S1, the control system apparatus CS reads the backup permission / rejection information from the corresponding backup control table in the database DB in step S2. In S3 to S5, the operation of the specific radio base station BSA is confirmed. As a result, if it is determined that the specific radio base station BSA is also inoperable, the process proceeds to step S8.

  In step S8, the control system apparatus CS uses the radio base station control module 24 to create another small area radio base station (providing area radio base station) that includes the user apparatus US in the radio area based on the backup permission / denial information. It is determined whether the BSF is available. And if it can be used, the operating status of the provided area radio base station BSF is determined. If the service area radio base station BSF is operating normally as a result of this determination, the service area radio base station BSF is instructed to connect to the radio module 12 of the user apparatus US.

  In response to the connection instruction, the provision area radio base station BSF receives a connection request from the user apparatus US and establishes a radio link with the radio module 12 of the user apparatus US as the request source. Execute. Thus, thereafter, the user apparatus US can transmit data such as Web information and mail to and from the upper network NW via the provision area radio base station BSF.

(effect)
As described above in detail, in the first embodiment, the backup control table of the database DB includes the radio base stations BSA and BSF in the small area where the user apparatus US exists in the radio area, the radio base station BSG in the middle area, and For each large area wireless base station BSH, backup permission / rejection information indicating whether or not the wired access device SS can be used is stored in advance. Then, in the control system apparatus CS, when a failure occurs in the wired access apparatus SS, an available radio base station is selected from the radio base stations based on the backup permission information, and the unselected radio If the base station is operating normally, the user apparatus US can access the upper network NW via the radio base station.

  Therefore, when a failure occurs in the wired access device SS, based on the backup permission / rejection information stored in advance in the backup control table of the database DB, the wireless base station permitted to be used as a backup target of the wired access device is Is selected and line backup is performed by the radio base station. For this reason, even if the user apparatus US tries to access the upper network NW using a radio base station other than the radio base station that is permitted to use, it cannot be accessed. It is possible to restrict the use of the wireless network.

  In addition, since the line backup is possible only by a specific radio base station that is permitted to use in advance among a plurality of radio base stations constituting the radio network, this corresponds to the band of the line of the wired access device SS to be backed up. It is only necessary to allocate a band to the specific radio base station, thereby making it unnecessary to secure a plane band and reducing the equipment cost. By reducing the equipment cost, it becomes possible to widely deploy line backup of a wired network.

  Further, for example, when both the wired access device SS and the small area radio base station BSA in the area where the user side device US exists due to a disaster, the middle area radio base station BSG constituting another radio network or The large area radio base station BSH is sequentially selected, and line backup is performed by the middle area radio base station BSG or the large area radio base station BSH. That is, a radio base station of another radio network adopting a medium cell or large cell system is selected, and line backup is performed. For this reason, even if the local wired access device SS and the small area radio base station BSA both fail due to a disaster or the like, the radio base station of another radio network adopting the medium cell or large cell system is used. Line backup is possible.

  Further, when there are a plurality of small area radio base stations including the user side device US in the radio area, when one of the specific radio base stations BSA cannot be used due to a failure, the other small area radio base stations Selected and line backup is performed. For this reason, even when a failure occurs in the specific radio base station BSA, the line backup can be performed by another small area radio base station BSF.

[Second Embodiment]
In the second embodiment of the present invention, as shown in FIG. 12, a specific radio base station BSA positioned for backup is shown in FIG. 12 (a) in a state where the wired access device SS is normally operating. In the state where a part of the band of the radio base station BSA is released and made available to the user terminal TM and a failure occurs in the wired access device SS, as shown in FIG. The BSA band restriction is canceled, and the wired line can be backed up using a sufficiently wide band.

  In the backup control table of the database DB, as shown in FIG. 13, “use permission with bandwidth limitation” is set as permission / rejection information in the sequence in the normal state in association with the specific radio base station BSA.

  The user side device US and the control system device CS execute a wired line backup procedure as follows. FIG. 13B is a diagram showing the contents of the failure detection method and the backup control method, and FIG. 14 is a sequence diagram showing the operation procedure.

  That is, in the network access system of the present embodiment, the line disconnection (1) of the wired line SL with the wired access apparatus SS is monitored in the wired module 14 of the user side apparatus US. In this state, when the line disconnection of the wired line SL is detected (2) by the wired module 14 of the user side apparatus US, the wired module 14 of the user side apparatus US notifies the control module 11 of the line disconnection (3). To do. Upon receiving the line disconnection detection notification (3), the control module 11 accesses the specific radio base station BSA, and controls the control system apparatus via the band-limited radio line provided by the specific radio base station BSA. A line failure detection notification is sent to the CS (4). This notification of detection of a line failure is sent from the specific radio base station BSA to the control system apparatus CS via the upper network NW.

  When receiving the line failure detection notification, the control system device CS first confirms (5) a failure with the wired module 14 of the user side device US via the wired access device SS. Subsequently, after reading backup permission / rejection information from the corresponding backup control table of the database DB and confirming that the specific radio base station BSA is available when a wired line failure occurs, the specific radio base station BSA and the user side device US The wireless module 12 is notified of the cancellation of the bandwidth limitation (6).

  As a result, a broadband wireless link whose band restriction is released is established (7) between the wireless module 12 of the user side apparatus US and the specific radio base station BSA. It is possible to transmit data such as Web information and mail with the upper network NW via the BSA.

  Therefore, according to the second embodiment, since the wireless line of the specific wireless base station BSA can be used in a band-limited state even during normal times, the wired module SL of the user-side apparatus US causes a failure of the wired line SL. Even when it is detected, this failure detection result can be notified to the control system apparatus CS via the specific radio base station BSA. In addition, since the band of the radio line of the specific radio base station BSA is normally limited, it is substantially difficult for the user-side apparatus US to perform data transmission via the specific radio base station BSA. The radio line of the base station BSA can be used only for the purpose of line backup of the wired access network.

[Other Embodiments]
In the first embodiment, when a failure occurs in both the wired access device SS and the specific radio base station BSA when a disaster occurs, the middle area radio base station BSG or the large area radio base station BSH is selected. Line backup. However, the present invention is not limited to this and may be as follows. That is, first, it is determined whether or not another small area radio base station including the user side device US in the radio area is usable, and if it is available, backup is attempted using the radio base station. On the other hand, when the other small area radio base stations cannot be used, the medium area radio base station BSG or the large area radio base station BSH is selected, and line backup is performed using the radio base station.

  In addition, the configuration and processing procedure and processing contents of the control system device, the types and processing functions of the wired access device and the wireless access device, the configuration of the backup permission / rejection information stored in the backup control table of the database DB, etc. Various modifications can be made without departing from the scope of the invention.

  In short, the present invention is not limited to the above-described embodiments as they are, and can be embodied by modifying the components without departing from the scope of the invention in the implementation stage. Moreover, various inventions can be formed by appropriately combining a plurality of constituent elements disclosed in the above embodiments. For example, some components may be deleted from all the components shown in each embodiment. Furthermore, you may combine suitably the component covering different embodiment.

  TM ... User terminal, US ... User side device, SS ... Wired access device, BSA to BSX ... Wireless base station, DB ... Database, CS ... Control system device, 11 ... Control module, 12 ... Wireless module, 13 ... Antenna, 14 DESCRIPTION OF SYMBOLS ... Wired module, 21 ... Control part, 22 ... Module for wired access apparatus control, 23 ... Search part, 24 ... Module for wireless base station control.

Claims (6)

A wired access device that connects a user device to a higher level network via a wired network, a plurality of wireless access devices that connect the user device to the higher level network via a wireless network, the wired access device and the multiple wireless access A network access system comprising a control device connected to a device and a storage device installed or connected to the control device,
The storage device stores information indicating whether to permit use as a backup target of the wired access device for each of the plurality of wireless access devices in association with the identification information of the user device,
The controller is
Means for determining whether or not the wired access device can communicate with the host network via the wired network when the user device communicates;
A selection means for selecting a wireless access device permitted to be used as a backup target based on information stored in the storage device when it is determined that the wired access device is not in a state in which the communication can be performed;
Means for notifying the wireless access device selected by the selection means of identification information of the user device and enabling wireless communication between the user device and the selected wireless access device. Network access system. The plurality of wireless access devices include first and second wireless access devices that can wirelessly communicate with the user device and have wireless areas of the same size,
The storage device stores information permitting the use of the first wireless access device as a backup target of the wired access device in association with the identification information of the user device, and backup of the first wireless access device. Storing information permitting the use of the second wireless access device as a target;
The selection means of the control device is:
Means for selecting the first wireless access device based on information stored in the storage device when it is determined that the wired access device is not in a state in which the communication can be performed;
Means for determining whether or not the selected first wireless access device is in a state capable of wireless communication;
Means for selecting the second wireless access device based on information stored in the storage device when it is determined that the first wireless access device is not in a state where wireless communication can be performed. The network access system according to claim 1. The plurality of wireless access devices are capable of wireless communication between the first wireless access device having a wireless area capable of wireless communication with the user device and the user device, and the first wireless device. A third wireless access device having a wireless area larger than the wireless area of the access device,
The storage device stores information permitting the use of the first wireless access device as a backup target of the wired access device in association with the identification information of the user device, and backup of the first wireless access device. Storing information permitting the use of the third wireless access device as a target;
The selection means of the control device is:
Means for selecting the first wireless access device based on information stored in the storage device when it is determined that the wired access device is not in a state in which the communication can be performed;
Means for determining whether or not the selected first wireless access device is in a state capable of wireless communication;
Means for selecting the third wireless access device based on information stored in the storage device when it is determined that the first wireless access device is not in a state where wireless communication is possible. The network access system according to claim 1 or 2. A wired access device that connects a user device to a higher level network via a wired network, and a control device that is connected to a plurality of wireless access devices that connect the user device to the higher level network via a wireless network,
A storage unit that stores information indicating whether or not to permit the use as a backup target of the wired access device for each of the plurality of wireless access devices in association with the identification information of the user device;
Means for determining whether or not the wired access device can communicate with the host network via the wired network when the user device communicates;
Means for selecting a wireless access device permitted to be used as a backup target based on the information stored in the storage unit when it is determined that the wired access device is not in a state in which the communication can be performed;
Means for notifying the selected wireless access device of identification information of the user device and enabling wireless communication between the user device and the selected wireless access device. Control device. Line backup control executed by a wired access device that connects a user device to a higher level network via a wired network, and a control device that is connected to a plurality of wireless access devices that connect the user device to the higher level network via a wireless network A method,
In association with the identification information of the user device, a process of storing, in a storage unit, information indicating whether or not use is permitted as a backup target of the wired access device for each of the plurality of wireless access devices;
A step of determining whether or not the wired access device can communicate with the higher-level network via the wired network when the user device performs communication;
When it is determined that the wired access device is not in a state where the communication can be performed, a process of selecting a wireless access device that is permitted to be used as a backup target based on information stored in the storage unit;
A step of notifying the selected wireless access device of identification information of the user device and enabling wireless communication between the user device and the selected wireless access device. Line backup control method.   The program for functioning a computer as said each means of the control apparatus of Claim 4.