JP5453928B2 - Routing device, communication control method, and communication system - Google Patents

Description

  The present invention relates to a method for recovering a communication system when a failure occurs in a device in the communication system.

  Recommendation TS29.213 V8.2.0 defined by 3GPP (3rd Generation Partnership Project) describes PCRF (Policy and Charging Rules Function) and DRA (Diameter Routing Agent; PCRF selection device). ing. As a configuration of a 3GPP communication system, a configuration including a PCRF and a configuration including a PCRF and a DRA are conceivable.

  An example of a communication system equipped with a PCRF is shown in FIG.

  The communication system shown in FIG. 5 includes a gateway 1 and a plurality of PCRFs 2, 3 and 4.

  The gateway 1 is a device that mutually converts and relays data between a network connecting the gateway 1 and the plurality of PCRFs 2, 3, and 4 and an external network.

  When a connection is requested from a terminal (not shown), the gateway 1 transmits a policy request indicating a policy acquisition request including a bandwidth, a QoS level, and the like used by the terminal to any of the PCRFs. . The PCRF that has received the policy request from the gateway 1 transmits to the gateway 1 the policy specified by the subscriber who uses the terminal as a response to the policy request.

  The PCRFs 2, 3, and 4 are devices that perform bandwidth control and charging control for communication of a terminal using a network.

  Band control and billing control are performed for each subscriber, and subscriber data of each subscriber necessary for the control is managed by an HSS (Home Subscriber Server) (not shown).

  When each PCRF receives a policy request from the gateway 1, it obtains subscriber data of the subscriber who uses the terminal from the HSS, and, as a response to the policy request, the policy specified by the subscriber in the subscriber data. Send to gateway 1.

  An example will be described in which the PCRF 2 performs bandwidth control and charging control for the subscriber A, and the PCRF 3 performs bandwidth control and charging control for the subscriber B.

  When the connection is requested from the terminal of the subscriber A, the gateway 1 transmits a policy request to the PCRF 2 that performs bandwidth control and charging control for the subscriber A. The PCRF 2 that has received the policy request acquires the subscriber data of the subscriber A from the HSS, and transmits the policy specified by the subscriber A in the subscriber data to the gateway 1 as a response to the policy request.

  Further, when the connection is requested from the subscriber B, the gateway 1 transmits a policy request to the PCRF 3 that performs bandwidth control and charging control for the subscriber B. The PCRF 3 that has received the policy request acquires the subscriber data of the subscriber B from the HSS, and transmits the policy specified by the subscriber B in the subscriber data to the gateway 1 as a response to the policy request.

  An example of a communication system equipped with PCRF and DRA is shown in FIG.

  The communication system shown in FIG. 6 includes a plurality of DRAs 5, 6, and 7 in addition to the gateway 1 and the plurality of PCRFs 2, 3, and 4.

  The DRAs 5, 6, and 7 are devices that select a PCRF that should transmit a policy request instead of the gateway 1. The DRAs 5, 6, and 7 have mapping information indicating the correspondence between subscribers using the network and PCRFs that perform bandwidth control and charging control for each subscriber, and map the policy request received from the gateway 1 Send to the appropriate PCRF according to the information. Note that the gateway 1 selects a DRA that transmits a policy request by, for example, a round robin method.

  The gateway 1, the PCRFs 2, 3, 4, and the DRAs 5, 6, and 7 are all connected to each other with a full mesh.

  An example in which the PCRF 2 performs bandwidth control and charging control for the subscriber A will be described.

  When the gateway 1 receives the signal from the subscriber A, the gateway 1 transmits a policy request to an arbitrary DRA. The DRA that has received the policy request from the gateway 1 recognizes that it is the PCRF 2 that performs bandwidth control and charging control for the subscriber A from the mapping information of its own device, and transmits the policy request to the PCRF 2. The PCRF 2 that has received the policy request acquires the subscriber data of the subscriber A from the HSS, and transmits the policy specified by the subscriber A in the subscriber data to the DRA that has transmitted the policy request as a response to the policy request. . Then, the DRA that has received the policy from the PCRF 2 transmits the received policy to the gateway 1.

  However, if a failure occurs in the PCRF 2 at this time, a response to the policy request is not returned from the PCRF 2 to the DRA. As a result, bandwidth control and billing control for subscriber A are not performed, and subscriber A cannot receive communication services.

  For example, Patent Document 1 proposes a technique for allowing a plurality of processors each having a unique memory to continue operation when a failure occurs in any of the memories. In Patent Document 1, a plurality of processors can access each other's memory, and when writing data, the same data is written to each other's memory. As a result, even when a failure occurs in the memory of a certain processor, the processor can continue to operate using the memory of another processor.

  However, the technique of Patent Document 1 is a technique for continuing the operation of a processor when a failure occurs in a memory. When a failure occurs in a PCRF, a communication service for a subscriber to be performed by the PCRF is described. It is not effective to continue processing.

Japanese Patent Laid-Open No. 5-94379

  As described above, in the conventional communication system, when a failure occurs in the PCRF, it is impossible to provide a communication service for a subscriber who performs bandwidth control and charging control using the PCRF.

  An object of the present invention is to provide a technique for a communication system to continue providing a communication service to a subscriber when a failure occurs in a PCRF in the communication system.

  In order to achieve the above object, the routing device of the present invention requests a control device to execute control from among a plurality of control devices that control both bandwidth and / or accounting for subscriber communication. Is a routing device that sorts out subscribers according to subscribers, and manages mapping information indicating correspondence between subscribers and control devices that are to perform control of communication of the subscribers. When a failure occurs in one of the control devices, the mapping information is updated so that the control execution of the subscriber who is requested to execute the control is transferred to another control device. When the communication terminal and the subscriber terminal communicate, the control device corresponding to the subscriber is acquired from the mapping information, and the acquired control device is connected to the subscriber communication. Having a control means for requesting execution of the control of Te.

  In order to achieve the above object, the communication control method according to the present invention executes control to any control device among a plurality of control devices that control both bandwidth and / or accounting for subscriber communication. A communication control method of a routing device that distributes whether to request according to a subscriber, wherein the management means includes mapping information indicating correspondence between the subscriber and a control device that is to perform control of communication of the subscriber When a failure occurs in any one of the plurality of control devices, the control execution of the subscriber who is requested to execute the control to the control device in which the failure has occurred is controlled. The mapping information is updated so as to be transferred to the control device, and when the subscriber terminal performs communication, the control means acquires the control device corresponding to the subscriber from the mapping information, and Requesting execution of a control for the communication of the subscriber to the controller.

  In order to achieve the above object, a communication system according to the present invention includes a plurality of control devices for controlling bandwidth and / or accounting for subscriber communications, subscribers, and communications for subscribers. Manages mapping information indicating the correspondence with the control device that should execute control, and when a failure occurs in any one of the plurality of control devices, requests execution of control from the failed control device The mapping information is updated so that execution of control of the subscriber to be transferred is transferred to another control device, and when the subscriber terminal performs communication, the control device corresponding to the subscriber is referred to as the mapping information. And a routing device that requests the acquired control device to execute control of the subscriber's communication.

  According to the present invention, when a failure occurs in the PCRF in the communication system, the communication system can continue to provide communication services to subscribers.

It is a block diagram which shows the structure of the communication system in one Embodiment of this invention. It is a block diagram which shows the structure of the routing apparatus in one Embodiment of this invention. 4 is a diagram illustrating an example of PCRF selection information stored in a storage device 40. FIG. 3 is a flowchart showing processing when the routing device shown in FIG. 2 reassigns PCRFs. It is a block diagram which shows the example of the communication system provided with PCRF. It is a block diagram which shows the example of the communication system provided with PCRF and DRA.

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

  In a communication system having a gateway, a plurality of PCRFs, a plurality of DRAs, and a HSS, the subscriber data of each subscriber necessary for the PCRF to perform bandwidth control and charging control for each subscriber is centralized in the HSS. Managed.

  Therefore, even if a failure occurs in a certain PCRF, if another PCRF performs bandwidth control and charging control for a subscriber to which the PCRF should perform bandwidth control and charging control, the communication service is continuously provided to the subscriber. be able to.

  However, a communication service cannot be provided to a subscriber unless the DRA recognizes which PCRF performs bandwidth control and charging control for communication of a terminal connected to the network.

  Therefore, in the communication system of this embodiment, the routing device having the DRA function monitors the occurrence of a failure in the PCRF, and when a failure occurs in any of the PCRFs, the subscriber to which the PCRF should perform bandwidth control and billing control. A new PCRF for performing bandwidth control and charging control is reassigned every time. In the communication system of the present embodiment, a subscriber to whom a PCRF is to be reassigned is set in advance for each routing device, and when the routing device reassigns a PCRF for a subscriber in charge of the own device, the subscriber and the PCRF The new association is notified to a routing device other than the own device.

  Even when a failure occurs in the PCRF in the communication system, each routing device shares the relationship between the subscriber and the PCRF, thereby continuing the communication service provided to the subscriber.

  FIG. 1 is a block diagram showing a configuration of a communication system according to an embodiment of the present invention.

  As shown in FIG. 1, the communication system according to an embodiment of the present invention includes a gateway 1, PCRFs 2, 3, 4 and routing devices 8, 9, 10.

  The gateway 1 is a device that mutually converts and relays data between the network shown in FIG. 1 and an external network.

  When a connection is requested from a terminal (not shown), the gateway 1 transmits a policy request to one of the routing devices.

  The PCRFs 2, 3, and 4 are devices that perform bandwidth control and charging control for communication of a terminal using a network.

  Band control and billing control are performed for each subscriber, and subscriber data of each subscriber necessary for control is managed by an HSS (not shown).

  When receiving the policy request from the routing device, the PCRFs 2, 3, and 4 obtain the subscriber data of the subscribers who use the terminal from the HSS, and are designated by the subscribers in the subscriber data as a response to the policy request. The existing policy is transmitted to the routing device that transmitted the policy request.

  The routing devices 8, 9, and 10 are devices that expand the functions of the DRA that is the PCRF selection device, and have the functions that the DRA has.

  When receiving the policy request from the gateway 1, the routing devices 8, 9, and 10 sort to which PCRF the policy request is transmitted according to the subscriber. Further, when the routing device 8, 9, 10 receives a policy designated for each subscriber as a response to the policy request from the PCRF that has transmitted the policy request, the routing device 8, 9, 10 transmits the received policy to the gateway 1.

  FIG. 2 is a block diagram showing the configuration of the routing device in one embodiment of the present invention.

  As illustrated in FIG. 2, the routing device according to the embodiment of the present invention includes a control unit 20, a management unit 30, and a storage device 40.

  The control unit 20 has a function of selecting a PCRF included in the DRA that performs bandwidth control and charging control for communication of a terminal using the network.

  When receiving the policy request from the gateway 1, the control unit 20 determines a PCRF to which the received policy request is to be transmitted. The routing device manages PCRF selection information as mapping information indicating the correspondence between subscribers using the network and PCRFs that perform bandwidth control and charging control for each subscriber. The PCRF selection information is preset in the routing device and stored in the storage device 40. An example of the PCRF selection information stored in the storage device 40 is shown in FIG. Based on the PCRF selection information, the control unit 20 determines the PCRF to which the received policy request is to be transmitted.

  The control unit 20 transmits / receives data defined by the Diameter protocol to / from each of the gateway 1 and the PCRF.

  The management unit 30 monitors the failure occurrence status of the PCRF. When a failure occurs, the management unit 30 newly adds a subscriber (hereinafter referred to as a controlled subscriber) to which the PCRF in which the failure has occurred performs bandwidth control and billing control. It has a function of reassigning a PCRF for performing bandwidth control and charging control for subscribers.

  The management unit 30 includes a failure detection unit 31, a reallocation unit 32, a reallocation information transmission unit 33, and a reallocation information reception unit 34.

  The failure detection unit 31 monitors the failure occurrence status of all PCRFs included in the communication system of the present embodiment. The failure detection unit 31 may determine the occurrence of a failure based on, for example, the connection status of SCTP (Stream Control Transmission Protocol) used in communication between the routing device and the PCRF, or a failure may occur between the routing device and the PCRF. The occurrence of a failure may be determined by providing a unique monitoring communication procedure.

  Note that when a failure occurs in a certain PCRF, the routing device of this embodiment newly assigns a PCRF for performing bandwidth control and charging control for each controlled subscriber of the PCRF. Since the communication system of the present embodiment has a plurality of routing devices, a routing device (hereinafter referred to as a leader routing device) that reassigns a PCRF that performs bandwidth control and charging control for each subscriber is provided so as not to cause confusion. Set in advance.

  Each routing device manages, as leader subscriber information, a subscriber to which a PCRF for which the own device performs bandwidth control and billing control when a failure occurs in the PCRF. Hereinafter, a subscriber to which a self-apparatus should reassign a PCRF for performing bandwidth control and billing control is referred to as a leader subscriber, and a controlled subscriber that is not so referred to as a non-leader subscriber. The leader subscriber information is preset in the routing device and stored in the storage device 40. An example of reader subscriber information stored in the storage device 40 is shown in FIG.

  When the failure detection unit 31 determines that a failure has occurred in the PCRF, the failure detection unit 31 extracts the controlled subscriber of the PCRF from the PCRF selection information. Then, the failure detection unit 31 determines whether or not the extracted controlled subscriber is a leader subscriber based on the leader subscriber information.

  The failure detection unit 31 requests the reassignment unit 32 to reassign the PCRF for the leader subscriber.

  When the reassignment unit 32 is requested by the failure detection unit 31 to reassign the PCRF for the leader subscriber, the reassignment unit 32 determines the PCRF for performing bandwidth control and charging control for the leader subscriber requested to be reassigned. Note that the routing device manages, as preliminary PCRF information, a PCRF that can perform bandwidth control and billing control for the leader subscriber. The preliminary PCRF information is set in advance in the routing device and stored in the storage device 40. An example of preliminary PCRF information stored in the storage device 40 is shown in FIG.

  The reallocation unit 32 determines a PCRF for performing bandwidth control and billing control for the leader subscriber requested to be reallocated based on the preliminary PCRF information. Then, the reallocation unit 32 updates the PCRF selection information stored in the storage device 40 based on the determined result.

  When the reallocation unit 32 updates the PCRF selection information stored in the storage device 40, the reallocation unit 32 transmits the reallocation information so as to notify the updated PCRF selection information to a routing device other than the own device included in the communication system of the present embodiment. Request to part 33.

  When the reallocation information transmission unit 33 is requested by the reallocation unit 32 to notify the updated PCRF selection information, the reallocation information transmission unit 33 notifies the routing device other than the own device of the updated PCRF selection information. Note that the routing device manages routing devices other than its own device, which should be notified of the updated PCRF selection information, as information sharing device information. The information sharing device information is set in advance in the routing device and stored in the storage device 40. An example of information sharing device information stored in the storage device 40 is shown in FIG.

  The reallocation information transmission unit 33 notifies the updated PCRF selection information to the routing device specified by the information sharing device information.

  The reallocation information receiving unit 34 receives the PCRF selection information updated for the leader subscriber of the routing device from a routing device other than the own device. The reassignment information receiving unit 34 updates the item of the subscriber updated with the received PCRF selection information among the PCRF selection information stored in the storage device 40.

  The storage device 40 is a storage device that stores PCRF selection information, leader subscriber information, preliminary PCRF information, and information sharing device information.

  Next, processing when the routing device shown in FIG. 2 reassigns the PCRF will be described.

  FIG. 4 is a flowchart showing processing when the routing device shown in FIG. 2 reassigns the PCRF.

  First, the failure detection unit 31 of the routing device monitors the failure occurrence status of all PCRFs included in the communication system of the present embodiment (step S1).

  When the failure detection unit 31 detects that a failure has occurred in any of the PCRFs, the failure detection unit 31 extracts controlled subscribers of the PCRFs from the PCRF selection information (step S2). Next, the failure detection unit 31 determines, for each extracted controlled subscriber, whether or not the controlled subscriber is a leader subscriber of the own device based on the leader subscriber information (step S3). ).

  If the extracted controlled subscriber is not the reader subscriber of the own device, the failure detection unit 31 stores the controlled subscriber as a non-leader subscriber and proceeds to step S8 (step S4).

  On the other hand, when the extracted controlled subscriber is a leader subscriber of the own device, the failure detection unit 31 requests the reassignment unit 32 to reallocate the PCRF of the controlled subscriber.

  When requested by the failure detection unit 31 to reassign the PCRF, the reassignment unit 32 determines a PCRF for performing bandwidth control and charging control for the controlled subscriber requested to be reassigned based on the preliminary PCRF information. (Step S5).

  When the PCRF for performing bandwidth control and charging control for the controlled subscriber requested to be reassigned is determined, the reassignment unit 32 updates the PCRF selection information stored in the storage device 40 based on the determined result ( Step S6).

  When the PCRF selection information stored in the storage device 40 is updated, the reallocation unit 32 requests the reallocation information transmission unit 33 to notify the updated PCRF selection information to a routing device other than the own device.

  When requested by the reallocation unit 32 to notify the updated PCRF selection information, the reallocation information transmission unit 33 extracts a routing device that notifies the updated PCRF selection information based on the information sharing device information, The updated PCRF selection information is notified (step S7).

  When the process for a controlled subscriber is completed, the failure detection unit 31 determines whether the processing for all controlled subscribers of the PCRF in which the failure has occurred is completed (step S8).

  If there is a controlled subscriber that has not yet been processed, the failure detection unit 31 proceeds to step S3, and continues processing for the controlled subscriber that has not been processed.

  On the other hand, when the processing of all controlled subscribers is completed, the failure detecting unit 31 determines whether or not there is a non-leader subscriber among all the controlled subscribers of the PCRF in which the failure has occurred. A determination is made based on the information of the non-reader subscriber stored in (Step S9).

  If there is no non-reader subscriber, the failure detection unit 31 proceeds to step S1 and again monitors the failure occurrence status of all the PCRFs included in the communication system of the present embodiment.

  On the other hand, when there is a non-leader subscriber, the failure detector 31 receives the reassignment information receiver 34 so as to receive the PCRF selection information updated for the non-leader subscriber from the reader routing device of the non-leader subscriber. To ask. At this time, the failure detection unit 31 notifies the reassignment information reception unit 34 of the information on the non-reader subscriber stored in step S4.

  When the failure detection unit 31 is requested to receive the PCRF selection information, the reallocation information reception unit 34 waits until the updated PCRF selection information for the non-leader subscriber is received from the reader routing device of the non-leader subscriber. (Step S10). When the PCRF selection information is received from the leader routing device of the non-leader subscriber, the reallocation information receiving unit 34 of the subscriber updated in the received PCRF selection information among the PCRF selection information stored in the storage device 40. The item is updated (step S11).

  When the process is completed for a controlled subscriber, the reallocation information receiving unit 34 receives from the failure detecting unit 31 whether or not the information of all the non-leader subscribers has been updated for the PCRF selection information of its own device. It discriminate | determines based on the information of a non-reader subscriber (step S12).

  If there is information on non-leader subscribers that have not been updated yet, the reallocation information receiving unit 34 proceeds to step S10, and the reader routing device of each non-leader subscriber for information on non-leader subscribers that has not been updated. Wait until the PCRF selection information is received.

  On the other hand, when the information of all the non-leader subscribers is updated, the reallocation information receiving unit 34 proceeds to step S1. The failure detection unit 31 again monitors the failure occurrence status of all PCRFs included in the communication system according to the present embodiment.

  When the controlled subscriber of the PCRF in which the failure has occurred is a leader subscriber, the control unit 20 continues to control the controlled subscriber until the PCRF selection information for the controlled subscriber is updated in step S6. Even if data for is received, it is discarded.

  When the controlled subscriber of the PCRF in which the failure has occurred is a non-leader subscriber, the control unit 20 determines that the controlled subscription until the PCRF selection information for the controlled subscriber is updated in step S11. Even if the data for the user is received, it is discarded.

  When the PCRF assigned a new subscriber from the routing device receives a policy request for the subscriber from any of the routing devices, the PCRF acquires the subscriber data of the subscriber from the HSS. Based on the data, bandwidth control and charging control for the subscriber are performed.

  Hereinafter, an example when a failure occurs in the PCRF in the communication system shown in FIG. 1 will be described.

  For example, assume that the routing device 8 manages the PCRF selection information, leader subscriber information, spare PCRF information, and information sharing device information shown in FIG. As shown in FIG. 3, the PCRF that performs bandwidth control and charging control for the subscriber A is the PCRF 2, and the leader routing device for the subscriber A is the routing device 8. At this time, it is assumed that a failure has occurred in PCRF2.

  First, the failure detection unit 31 of the routing device 8 monitors the failure occurrence status of the PCRFs 2, 3 and 4.

  When the failure detection unit 31 detects that a failure has occurred in the PCRF 2, the failure detection unit 31 first extracts the subscriber A as a controlled subscriber of the PCRF 2 from the PCRF selection information.

  Based on the PCRF selection information, since the subscriber A is a leader subscriber of the routing device 8, the failure detection unit 31 requests the reassignment unit 32 to reassign the PCRF of the subscriber A.

  The reallocation unit 32 changes the PCRF allocation destination of the subscriber A to the PCRF 4 based on the preliminary PCRF information, and updates the PCRF selection information in the storage device 40.

  Next, the reallocation unit 32 requests the reallocation information transmission unit 33 to notify the updated PCRF selection information to a routing device other than the own device.

  The reallocation information transmission unit 33 extracts the routing devices 9 and 10 as the routing devices that notify the updated PCRF selection information from the information sharing device information, and notifies the routing devices 9 and 10 of the updated PCRF selection information.

  Next, the failure detection unit 31 extracts the subscriber E as a controlled subscriber of the PCRF 2 from the PCRF selection information.

  Based on the PCRF selection information, since the subscriber E is not the leader subscriber of the routing device 8, the failure detection unit 31 stores the subscriber E as a non-leader subscriber.

  Based on the PCRF selection information, the controlled subscribers of the PCRF 2 are only the subscriber A and the subscriber E. Next, the failure detection unit 31 includes a non-reader subscriber among the controlled subscribers of the PCRF 2. Determine if it exists. Since the subscriber E exists as a non-leader subscriber, the failure detection unit 31 receives the PCRF selection information updated with respect to the information on the subscriber E from the reader routing device of the subscriber E. To ask.

  When the reallocation information receiving unit 34 receives the PCRF selection information updated for the subscriber E information from the reader routing device of the subscriber E, the PCRF selection stored in the storage device 40 is received based on the received PCRF selection information. Of the information, the item of the subscriber E is updated.

  When the reallocation information receiving unit 34 updates the item of the subscriber E in the PCRF selection information stored in the storage device 40, the failure detection unit 31 again monitors the failure occurrence status of the PCRFs 2, 3, and 4.

  When the PCRF 4 to which the subscriber A is newly assigned receives a policy request for the subscriber A from any of the routing devices, the PCRF 4 acquires the subscriber data of the subscriber A from the HSS and converts it into the subscriber data. Based on this, bandwidth control and charging control for subscriber A are performed.

  Thereafter, when receiving the policy request for the subscriber A from the gateway 1, the routing devices 8, 9, and 10 transmit the policy request to the PCRF 4.

  As described above, according to this embodiment, the routing device having the DRA function monitors the occurrence of a failure in the PCRF, and when a failure occurs in any of the PCRFs, the PCRF performs bandwidth control and charging control. A PCRF for performing bandwidth control and charging control is newly assigned to each subscriber. Accordingly, even when a failure occurs in the PCRF in the communication system, the communication system can continue to provide communication services to the subscriber.

  Further, according to the present embodiment, the routing device to which the PCRF is reassigned assigns mapping information indicating the correspondence between the subscriber and the PCRF that is to execute control of communication of the subscriber to the routing device other than the own device. Notice. As a result, even when a failure occurs in the PCRF in the communication system, each routing device can share the relationship between the subscriber and the PCRF that is to perform control of the subscriber's communication. .

  In addition, a subscriber to whom a PCRF should be reassigned for each routing device is set in advance, and each routing device reassigns a PCRF to a subscriber in charge of the own device, thereby reducing the processing load of the routing device in the communication system. Can be dispersed.

  Further, according to the present embodiment, the routing device notified of the new mapping information updates the mapping information of the own device according to the received mapping information. Thereby, even when a failure occurs in the PCRF in the communication system, each routing device can transmit a policy request to an appropriate PCRF.

  In addition, when a failure occurs in the PCRF, the routing device according to the present embodiment receives data for the controlled subscriber until the PCRF selection information for the controlled subscriber of the PCRF is updated. Discard. Accordingly, it is possible to suppress redundant processing that makes a request to the PCRF that cannot operate due to a failure.

1 Gateway 2, 3, 4 PCRF
5, 6, 7 DRA
8, 9, 10 Routing device 20 Control unit 30 Management unit 31 Failure detection unit 32 Reallocation unit 33 Reallocation information transmission unit 34 Reallocation information reception unit 40 Storage device

Claims (12)

A routing device that distributes according to a subscriber which control device is requested to execute control among a plurality of control devices that control both bandwidth and / or billing for subscriber communication,
Managing mapping information indicating correspondence between a subscriber and a control device that is to execute control of communication of the subscriber, and when a failure occurs in any one of the plurality of control devices, the failure Management means for updating the mapping information so as to transfer the control execution of the subscriber who is the target of requesting the control execution to the control apparatus in which
Control means for obtaining a control device corresponding to the subscriber from the mapping information when the subscriber's terminal performs communication, and requesting the acquired control device to execute control on the communication of the subscriber;
A routing device. A plurality of the routing devices;
The management means instructs other routing devices to update the same mapping information when updating the mapping information of the own device.
The routing device according to claim 1. A plurality of the routing devices;
When the management unit is instructed to update the mapping information by another routing device, the management unit updates the mapping information of the own device according to the instruction.
The routing device according to claim 1 or 2. When a failure occurs in any one of the plurality of control devices, the control means performs control of a subscriber who is requested to execute control to the control device in which the failure has occurred. Until moving to the control terminal, discard the data for the subscriber,
The routing device according to any one of claims 1 to 3. This is a communication control method for a routing device that distributes according to subscribers which control device is requested to execute control among a plurality of control devices that control both bandwidth and / or billing for subscriber communications. And
Management means
Managing mapping information indicating correspondence between a subscriber and a control device that is to execute control of communication of the subscriber;
When a failure occurs in any one of the plurality of control devices, the control execution of the subscriber who is requested to execute the control is transferred to another control device. Update the mapping information to
The control means
When a subscriber's terminal performs communication, a control device corresponding to the subscriber is acquired from the mapping information,
A communication control method for requesting the acquired control device to execute control for communication of the subscriber. A plurality of the routing devices;
When the management unit updates the mapping information of its own device, it instructs other routing devices to update the same mapping information.
The communication control method according to claim 5. A plurality of the routing devices;
When the management means is instructed to update the mapping information from another routing device, it updates the mapping information of the own device according to the instruction.
The communication control method according to claim 5 or 6. When a failure occurs in any one of the plurality of control devices, the control means performs control of a subscriber who is requested to execute control to the control device in which the failure has occurred. Until moving to the control terminal, discard the data for the subscriber,
The communication control method according to any one of claims 5 to 7. A plurality of control devices for controlling bandwidth and / or accounting for subscriber communication;
Managing mapping information indicating correspondence between a subscriber and a control device that is to execute control of communication of the subscriber, and when a failure occurs in any one of the plurality of control devices, the failure When the mapping information is updated so that the control execution of the subscriber who is requested to execute the control is transferred to another control apparatus, and the subscriber's terminal performs communication, A routing device that acquires a control device corresponding to a subscriber from the mapping information, and requests the acquired control device to execute control of communication of the subscriber;
A communication system. A plurality of routing devices;
When the routing device updates its own mapping information, it instructs other routing devices to update the same mapping information.
The communication system according to claim 9. A plurality of routing devices;
When the routing device is instructed to update the mapping information from another routing device, the routing device updates the mapping information of the own device according to the instruction.
The communication system according to claim 9 or 10. When a failure occurs in any one of the plurality of control devices, the routing device may execute control of a subscriber who is a target of requesting control execution from the failed control device. Until moving to the control terminal, discard the data for the subscriber,
The communication system according to any one of claims 9 to 11.

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