JP2017173886A - Communication system, storage device, communication method, and program - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a new mechanism for proper data migration.SOLUTION: A storage device includes a storage unit configured to store data received from another storage device and to be accessed by a first node and a second node. The storage device includes a processor configured to detect a difference on the data due to an access from the second node, when the first node is connected to the other storage device and the second node is connected to the above storage device in place of the other storage device. The storage device includes an interface configured to transmit difference data on the difference, to the other storage device.SELECTED DRAWING: Figure 6

Description

  The present disclosure relates to a communication system, a storage device, a communication method, and a program.

  Patent Document 1 shows a data migration method for migrating data of a migration source system to a migration destination system.

  Further, Patent Document 2 shows a data migration method for smoothly migrating data so that migration source data used in a currently operating system can be used in another new system. At a certain point in time, all data is extracted from the old system, and this is migrated to the new system as a batch.After the initial migration is completed, only the updated / added data is extracted as differential data, and migration is performed as needed. Is called.

JP2013-186741A JP-A 2005-266973

  However, in Patent Document 2, only one-way differential data transfer from the old system to the new system is performed. For example, if data related to the new system is updated for some reason during the migration, there is a risk that data mismatch will occur between the new system and the old system. As a result of this mismatch, normal data processing may not be performed.

  The exemplary embodiment aims to provide a new mechanism for properly performing data migration.

  The communication system of the exemplary embodiment includes a first node, a second node, a first storage device, and a second storage device. The first storage device stores data accessible by the first node and the second node, and transmits the data to a second storage device. The second storage device stores the data received from the first storage device. In the second storage device, the first node is connected to the first storage device, and the second node changes the connection destination from the first storage device to the second storage device. And detecting that a difference with respect to the data has occurred due to access from the second node, and transmitting difference data relating to the difference to the first storage device.

  The storage device of another exemplary embodiment includes a storage unit configured to store data received from the other storage device and accessible by the first node and the second node. When the first node is connected to the other storage device and the second node changes the connection destination from the other storage device to the own device, the storage device is A processor configured to detect that the access has caused a difference to the data; The storage device has an interface configured to transmit difference data regarding the difference to the other storage device.

  The communication method according to another exemplary embodiment is a communication method of a communication system including a first node, a second node, a first storage device, and a second storage device. The first storage device stores data accessible by the first node and the second node, and transmits the data to a second storage device. The second storage device stores the data received from the first storage device. In the second storage device, the first node is connected to the first storage device, and the second node changes the connection destination from the first storage device to the second storage device. And detecting that a difference with respect to the data has occurred due to access from the second node, and transmitting difference data relating to the difference to the first storage device.

  The communication method of another exemplary embodiment includes receiving data accessible by a first node and a second node from a first storage device. In the communication method, the first node is connected to the first storage device, and the second node changes the connection destination from the first storage device to the second storage device. And detecting that a difference with respect to the data has occurred due to access from the second node, and transmitting difference data relating to the difference to the first storage device.

A program of another exemplary embodiment receives data accessible by a first node and a second node from a first storage device, and the first node connects to the first storage device When the second node changes the connection destination from the first storage device to the second storage device, it detects that a difference with respect to the data has occurred due to access from the second node. The difference data related to the difference is transmitted to the one storage device.
Let the computer do that.

  According to the exemplary embodiment, a new mechanism for appropriately performing data migration can be realized.

1 illustrates a communication system of a first exemplary embodiment. 1 shows a home subscriber server HSS of a first exemplary embodiment. 1 shows a consolidated database DB of a first exemplary embodiment. 2 shows a first operation of the first exemplary embodiment. 2 illustrates a second operation of the first exemplary embodiment. Fig. 8 illustrates a third operation of the first exemplary embodiment. Fig. 8 illustrates a fourth operation of the first exemplary embodiment. 2 shows a storage device of a second exemplary embodiment.

  In the following, exemplary embodiments will be described in detail with reference to the accompanying drawings. In each drawing, the same or corresponding elements are denoted by the same reference numerals, and redundant description is omitted as necessary for clarification of the description. A plurality of exemplary embodiments described below can be implemented independently or in appropriate combinations. In each drawing, the same or corresponding elements are denoted by the same reference numerals, and redundant description is omitted as necessary for clarification of the description.

<First Exemplary Embodiment>
FIG. 1 shows a communication system of a first exemplary embodiment.
The communication system of the present embodiment includes a home subscriber server HSS (Home Subscriber Server), a subscriber management node SLF (Subscription Location Function), a signal relay station STP (Signal Transfer Point), and an integrated database DB (DataBase). The subscriber management node SLF and the signal relay station STP are connected to the home subscriber server HSS. Thereafter, when the home subscriber server HSS is transferred to the integrated database DB, the subscriber management node SLF and the signal relay station STP are connected to the integrated database DB.

  The home subscriber server HSS holds subscriber data (subscriber information) used for call processing.

  The integrated database DB has a storage area (storage unit) for holding subscriber information.

  Subscriber data (subscriber information) stored in the home subscriber server HSS is accessed from the signal relay station STP using the common channel signal No. 7 (Common Channel Signaling System No. 7, SS7). The common line signal No. 7 is a signaling protocol for the telephone network used in the public switched telephone network. FIG. 1 shows, as an example, a MAP signal related to a MAP (Mobile Application Part), which is one of the transaction function users positioned at the highest level in the No. 7 common line signaling hierarchical structure.

  The subscriber data (subscriber information) of the home subscriber server HSS is accessed from the subscriber management node SLF using the Diameter signal. Note that Diameter is an authentication, authorization, and accounting (AAA) protocol that succeeds RADIUS (Remote Authentication Dial In User Service).

  The subscriber data (subscriber information) of the home subscriber server HSS is accessed from both the subscriber management node SLF and the signaling relay station STP, and is updated or referred to.

  FIG. 2 shows the home subscriber server HSS of the first exemplary embodiment.

  The home subscriber server HSS includes a DB interface 11, a storage unit 12, a processor 13, an SLF interface 14, and an STP interface 15.

  The DB interface 11 is an interface with the integrated database DB.

  The storage unit 12 is configured to store data received from various nodes (for example, the subscriber management node SLF and the signal relay station STP). The data includes the above-described subscriber data (subscriber information).

  The processor 13 is configured to control each component in the home subscriber server HSS. For example, the processor 13 is configured to be able to detect that a difference with respect to data stored in the storage unit 12 has occurred. Further, the processor 13 can perform control so that the dirty data is associated with the difference data regarding the difference and stored in the storage unit 12.

  The SLF interface 14 is an interface with the subscriber management node SLF.

  The STP interface 15 is an interface with the signal relay station STP.

  FIG. 3 shows the consolidated database DB of the first exemplary embodiment.

  The integrated database DB includes an HSS interface 21, a storage unit 22, a processor 23, an SLF interface 24, and an STP interface 25.

  The HSS interface 21 is an interface with the home subscriber server HSS.

  The storage unit 22 is configured to store data that is accessed from various nodes (for example, the subscriber management node SLF and the signal relay station STP). The data includes the above-described subscriber data (subscriber information).

  The processor 23 is configured to control each component of the integrated database DB. For example, the processor 23 is configured to be able to detect that a difference has occurred with respect to the data stored in the storage unit 22. Further, the processor 23 can perform control so that the dirty data is associated with the difference data regarding the difference and stored in the storage unit 22.

  The SLF interface 24 is an interface with the subscriber management node SLF.

  The STP interface 25 is an interface with the signal relay station STP.

  FIG. 4 illustrates a first operation of the first exemplary embodiment.

  In S10, the home subscriber server HSS starts migrating the subscriber data stored in the storage unit 12 to the integrated database DB. The subscriber data stored in the storage unit 12 is copied to the integrated database DB.

  In S11, the home subscriber server HSS sets a migration flag as information indicating that the migration to the integrated database DB is in progress. Here, the in-migration flag is set to “ON” for the subscriber data to be migrated.

  Note that S10 and S11 may be performed at the same timing. S10 may be implemented after S11. In this case, the subscriber data in which the migration flag is set is copied to the integrated database DB.

  In S12, after the copy of the subscriber data in S10 is completed, if difference data for the subscriber data is generated, the difference data is detected using the dirty bit set for the difference data. In this example, “1” is set as the dirty bit in the addresses “AAAAAAA” and “AAAAAAA”. “1” set as a dirty bit indicates that the data at the corresponding address is differential data.

  In S13, the home subscriber server HSS transmits (copies) only the detected difference data to the integrated database DB. The dirty bit is cleared (changed from “1” to “0”) when the copy of the difference data is completed. The dirty bit may be cleared based on a signal (or information) notifying that the copy of the difference data from the integrated database DB has been completed. The dirty bit is also referred to as a flag for notifying that difference data is generated because there is a new update during the migration of subscriber data and this difference data must be transmitted to the integrated database DB.

  FIG. 5 illustrates a second operation of the first exemplary embodiment.

  In S14, the destination of the Diameter signal in the subscriber management node SLF is changed from the home subscriber server HSS to the integrated database DB. At this time, the destination of the MAP signal in the signal relay station STP is the home subscriber server HSS. This indicates that the home subscriber server HSS and the integrated database DB are in a transition period in which access exists. The Diameter signal is a technology related to a LAN (local area network). For this reason, the change of the destination (transmission destination) is realized by changing the routing information. Here, for example, the destination change may be autonomously performed by the subscriber management node SLF or the signal relay station STP. Further, the destination change may be performed by an upper node (server or the like) that manages the subscriber management node SLF, the signal relay station STP, or the like. Further, based on a command (command or instruction) input from the outside of the SLF or STP, the old routing information held by the SLF or STP can be executed by the designation by the command.

  In S15, when the integrated database DB receives the Diameter signal from the subscriber management node SLF, the integrated database DB prompts the subscriber management node SLF to retransmit to the home subscriber server HSS. Here, the integrated database DB detects that the migration flag “ON” is set in the subscriber data corresponding to the received Diameter signal, and prompts the retransmission to access the subscriber data being migrated. .

  In S16, the subscriber management node SLF retransmits the Diameter signal to the home subscriber server HSS.

  The operation of FIG. 5 restricts the subject of data update in the transitional state to the home subscriber server HSS. As a result, the data to be updated can be managed centrally.

  In the case of this example, the Diameter signal transmitted from the subscriber management node SLF to the integrated database DB is retransmitted to the home subscriber server HSS. Only data updated by the retransmitted Diameter signal is transmitted (copied) to the integrated database DB as in S13.

  FIG. 6 illustrates a third operation of the first exemplary embodiment.

  In S17, the destination of the MAP signal in the signal relay station STP is changed from the home subscriber server HSS to the integrated database DB side.

  In S18-1, the home subscriber server HSS cancels the transition flag (turns it off). In addition, the home subscriber server HSS stops copying the transmission of the difference data (subscriber data update information) to the integrated database DB.

  In S18-2, the integrated database DB sets (turns on) a migration flag. As described above, the migration flag is set to ON in advance for the subscriber data copied from the HSS to the integrated DB.

  In S19, it is detected whether or not there is a difference (update) in the subscriber data stored in the storage unit 22, and a dirty bit is set for an address related to the detected difference. For example, the integrated database DB is accessed from the signal relay station STP and the subscriber management node SLF, and update data (difference data) is generated by this access.

  In S20, update data (difference data) corresponding to the set dirty bit is transmitted (copied) to the home subscriber server HSS.

    FIG. 7 illustrates a fourth operation of the first exemplary embodiment.

  In S21, when it is confirmed that the integrated database DB is operating stably, the in-migration flag is canceled (turned off). Also, the copy of the update data (difference data) to the home subscriber server HSS is completed. The transition flag may be released when the MAP signal from the signal relay station STP is received by the integrated database DB.

  In the example of FIG. 7, the subscriber data of the home subscriber server HSS and the subscriber data of the integrated database DB match.

  If the integrated database DB is not operating stably in S21 (when stable operation cannot be confirmed), the system migration from the home subscriber server HSS to the integrated database DB is stopped, and the integrated database DB is connected to the home subscriber. A system failback to the server HSS is performed. Even if failback is performed, the failback can be easily realized because the latest subscriber data of the home subscriber server HSS and the integrated database DB match.

  In the above, one of the purposes of the transition flag is to synchronize the signal processing of the MAP signal and the Diameter signal.

  According to the above-described embodiment, it is possible to shift the system from the first system to the second system without stopping the service for the terminals and devices that use the communication system. Moreover, not only migration but also failback is possible. In addition, the latest subscriber data can be kept in the transition and / or failback.

  Further, according to the above-described embodiment, in the transition period from the first system to the second system, the data update in both the first and second systems is restricted, and the data update is performed only in one system. It is possible. As a result, it is possible to centrally manage the data update contents that occur during the transitional transition period.

  In addition, according to the above-described embodiment, update data (difference data) copy processing using dirty bits is performed bi-directionally between the first and second systems. As a result, appropriate latest data can be retained.

  Further, according to the above embodiment, the latest data can be held in both systems without stopping the system in the system transition in the system in which data is updated in real time.

  Therefore, for example, the present embodiment can be applied to system migration of a system that is assumed to be continuously operated for 24 hours, such as a mobile communication system. The mobile communication system is premised on operating for 24 hours, and is not stopped at the time of system transition. That is, since data is updated in real time even during system migration, there is a high need to keep the latest data. Further, when switching back from the new system to the old system for some reason such as migration failure, it is necessary for the old system to take over the data update in the new system correctly. Still further, devices such as the home subscriber server HSS receive access from a plurality of different nodes, and the data held in the home subscriber server HSS is updated. When migrating, changing the signal destinations from all the different nodes accessing the home subscriber server HSS to the new system has a high computer processing load, and it is impossible to change all the destinations simultaneously. It is. Further, when data is updated in both the migration source system and the migration destination system in the transition transition period, it is difficult to hold the same latest data between both storage devices.

  According to this embodiment, the problem of migration in these mobile communication systems can be solved, and data migration without service stop is realized at the time of system migration.

<Second Exemplary Embodiment>
The storage device 100 includes a storage unit 101, a processor 102, and an interface 103.

  The storage unit 101 is configured to store data received from other storage devices and accessible by the first node and the second node.

  The processor 102 accesses the second node when the first node is connected to the other storage device and the second node changes the connection destination from the other storage device to the own device. Is configured to detect that a difference with respect to the data has occurred.

  The interface 103 is configured to transmit difference data regarding the difference to the first storage device.

  According to the present embodiment, a new mechanism for appropriately performing data migration can be provided. For example, since the difference data is transmitted from the migration destination system to the migration source system, the migration destination and the migration source storage device can hold the same latest data. In this way, data migration can be performed more appropriately.

<Other exemplary embodiments>
The transition flag described above will be exemplified. In this example, it is assumed that a certain subscriber terminal A moves from an old area to a new area.

  In this case, a MAP signal relating to a request to delete the old location information is transmitted to the HSS. This deletion request is for requesting deletion of the location information indicating that the subscriber terminal A is located in the old area from the HSS.

  In addition, a Diameter signal related to a registration request for new location information is transmitted to the HSS. This registration request is for requesting registration of new location information indicating that the subscriber terminal A is in the new area in the HSS.

  Thus, since the HSS receives two signals at the same time, it is necessary to prepare an environment where the MAP signal and the Diameter signal can be processed.

Since the Diameter signal is LAN-based, it is possible to change the SLF routing information and switch destinations with a small amount of work. On the other hand, since the MAP is based on SS7, many procedures must be executed for the change compared to the change of the routing information of the SLF. This creates a time lag for the destination change. Communication is not possible during this time lag. This problem can be solved by using a transition flag.
1) First, a migration flag ON is set in advance for subscriber data to be migrated.
2) The subscriber data for which the migration flag ON is set is migrated from the HSS to the integrated DB.
3) The Diameter signal from the SLF is redirected and routed to the new system (integrated DB side).
4) The migration flag is set to ON for the subscriber data being migrated in the integrated DB. Therefore, the integrated DB transfers the corresponding Diameter to the old system (HSS side).
5) After this state is completed on the network, the MAP signal (SS7 signal) is switched.
6) A MAP signal is transmitted to the integrated DB of the new system.
7) The integrated DB turns off the transition flag at the timing of receiving the MAP signal.

  As a result, the integrated DB can simultaneously perform the processing of the MAP signal and the stop of the processing of transferring the Diameter signal from the SLF to the old system. By processing in the next system including the integrated DB, the MAP signal and Diameter signal are processed at the same time, and the occurrence of the time lag can be avoided.

  In the above, the series of operations of the first exemplary embodiment has been shown using FIGS. All of this series of operations may not be performed. Only necessary operations are performed according to the status of the home subscriber server HSS and the integrated database DB. For example, only one of the operation 2 and the operation 3 may be executed. Further, the order of performing the operations 1 to 4 is not particularly limited.

  In the above, the example of the transition from the home subscriber server HSS to the integrated database DB is shown, but the present invention is not limited to this. For example, migration from the home subscriber server HSS to another storage device (excluding the integrated database DB) may be performed. Further, for example, migration from another storage device to the integrated database DB may be performed. Further, it may be a transition from the first home subscriber server HSS to the second home subscriber server HSS. Further, it may be a transition from the first integrated database DB to the second integrated database DB.

  The subscriber data in the home subscriber server HSS and the integrated database DB can be stored using various types of non-transitory computer readable media. Non-transitory computer readable media include various types of tangible storage media. Examples of non-transitory computer-readable media include magnetic recording media (for example, flexible disks, magnetic tapes, hard disk drives), magneto-optical recording media (for example, magneto-optical disks), CD (Compact Disc) -ROM (Read Only Memory), CD-R, CD-R / W, Digital Versatile Disk (DVD), semiconductor memory (for example, mask ROM, PROM (Programmable ROM), EPROM (Erasable PROM), flash ROM, RAM (Random Access Memory)) are included. Subscriber data may also be stored on various types of transitory computer readable media. Examples of transitory computer readable media include electrical signals, optical signals, and electromagnetic waves. Transient computer readable media may be supplied with subscriber data via wired communication paths such as electrical wires and optical fibers, or wireless communication paths.

  “Access” in the above includes connection from a node to a storage device, reading data from the storage device, and writing (addition, deletion, update) to the storage device. But you can.

  “Switching back” in the above is to switch back to the original state by switching the system operation from one system to another system and then switching back in the opposite direction. Switching back means the reverse work of “switching”. For example, in the case of a transition from an old system to a new system, when a serious problem occurs during the switching operation and the operation of the new system cannot be expected, the switching is canceled and returned to the original state. Continuing the operation is called switchback.

  The subscriber management node SLF and the signal relay station STP are shown as examples of the node that accesses the storage device, but are not limited thereto. For example, the node accessing the storage device may be a DRA (Diameter Router Agent) DIAMETER routing agent or a DEA (Diameter Edge Agent) Diameter edge agent.

  In the above, the processing performed by each component (home subscriber server HSS, integrated database DB, signal relay station STP, subscriber management node SLF) provided in the communication system is a logic circuit created according to the purpose. You may make it do.

  In addition, a computer program (hereinafter referred to as a program) in which processing contents are described as a procedure is recorded on a recording medium that can be read by each of the elements constituting the communication system. It may be read and executed by each component of the system.

  The program recorded on this recording medium is read by a Central Processing Unit (CPU) provided in each component of the wireless communication system, and the same processing as described above is performed under the control of the CPU. Here, the CPU operates as a computer that executes a program read from a recording medium on which the program is recorded.

  In the above example, the program can be stored and supplied to a computer using various types of non-transitory computer readable media. The program may also be supplied to the computer by various types of transitory computer readable media.

  While the present invention has been described with reference to the embodiments, the present invention is not limited to the above embodiments. Various changes that can be understood by those skilled in the art can be made to the configuration and details of the present invention within the scope of the present invention.

<Appendix>
Part or all of the exemplary embodiments described above can be described as the following supplementary notes. However, the following supplementary notes are merely examples of the present invention, and the present invention is not limited only to such cases.

(Appendix 1)
A first node;
A second node;
A first storage device;
A communication system having a second storage device,
The first storage device
Storing data accessible by the first node and the second node;
Sending the data to a second storage device;
The second storage device is
Storing the data received from the first storage device;
In the case where the first node is connected to the first storage device, and the second node changes the connection destination from the first storage device to the second storage device,
Detecting that a difference to the data has occurred due to an access from the second node;
Transmitting difference data relating to the difference to the first storage device;
Communications system.
(Appendix 2)
The first storage device
After transmitting the data to the second storage device and detecting that a difference to the data has occurred,
Transmitting difference data relating to the difference detected by the first storage device to the second storage device;
The communication system according to attachment 1.
(Appendix 3)
The difference data detected by the first storage device is
In correspondence with the first identification information, stored in the first storage device,
The difference data detected by the second storage device is
In association with the second identification information, stored in the second storage device,
The communication system according to attachment 2.
(Appendix 4)
The first identification information or the second identification information is:
Dirty bit,
The communication system according to attachment 3.
(Appendix 5)
When the first storage device performs the transmission,
Information indicating that data is being transferred to the second storage device is set in the first storage device,
When the second storage device performs the transmission,
Information indicating that data is being migrated to the first storage device is set in the second storage device.
The communication system according to attachment 4.
(Appendix 6)
The second storage device is
When receiving the second access from the second node while receiving the data from the first storage device,
Transmitting information for the second access to the first storage device to the second node;
The communication system according to any one of appendices 1 to 5.
(Appendix 7)
A storage configured to store data received from the other storage device and accessible by the first node and the second node;
In the case where the first node is connected to the other storage device and the second node changes the connection destination from the other storage device to the own device,
A processor configured to detect that a difference to the data has occurred due to an access from the second node;
An interface configured to transmit difference data relating to the difference to the other storage device;
A storage device.
(Appendix 8)
The difference data detected by the processor is:
In association with the identification information, stored in the storage unit,
The storage device according to appendix 7.
(Appendix 9)
The identification information is
Dirty bit,
The storage device according to attachment 8.
(Appendix 10)
When the transmission is performed by the interface,
Information indicating that data is being transferred to the other storage device is set in the storage device.
The storage device according to attachment 9.
(Appendix 11)
The storage device is
When receiving the second access from the second node while receiving the data from the other storage device,
Transmitting information for the second access to the other storage device to the second node;
The storage device according to any one of appendices 7 to 10.
(Appendix 12)
A first node;
A second node;
A first storage device;
A communication method of a communication system having a second storage device,
The first storage device
Storing data accessible by the first node and the second node;
Sending the data to a second storage device;
The second storage device is
Storing the data received from the first storage device;
In the case where the first node is connected to the first storage device, and the second node changes the connection destination from the first storage device to the second storage device,
Detecting that a difference to the data has occurred due to an access from the second node;
Transmitting difference data relating to the difference to the first storage device;
Communication method.
(Appendix 13)
The first storage device
After transmitting the data to the second storage device and detecting that a difference to the data has occurred,
The data transmitted by the first storage device is:
Differential data relating to the difference detected by the first storage device;
The communication method according to attachment 12.
(Appendix 14)
The difference data detected by the first storage device is
In correspondence with the first identification information, stored in the first storage device,
The difference data detected by the second storage device is
In association with the second identification information, stored in the second storage device,
The communication method according to attachment 13.
(Appendix 15)
The first identification information or the second identification information is:
Dirty bit,
The communication method according to attachment 14.
(Appendix 16)
When the first storage device performs the transmission,
Information indicating that data is being transferred to the second storage device is set in the first storage device,
When the second storage device performs the transmission,
Information indicating that data is being migrated to the first storage device is set in the second storage device.
The communication method according to attachment 15.
(Appendix 17)
The second storage device is
When receiving the second access from the second node while receiving the data from the first storage device,
Transmitting information for the second access to the first storage device to the second node;
The communication method according to any one of appendices 12 to 16.
(Appendix 18)
Receiving data accessible from the first storage device by the first node and the second node;
In the case where the first node is connected to the first storage device and the second node changes the connection destination from the first storage device to the second storage device,
Detecting that a difference to the data has occurred due to an access from the second node;
Transmitting difference data relating to the difference to the first storage device;
Communication method.
(Appendix 19)
For the difference data,
Identification information for identifying the difference data is set.
The communication method according to appendix 18.
(Appendix 20)
The identification information is
Dirty bit,
The communication method according to appendix 19.
(Appendix 21)
When the transmission is performed,
Information indicating that data is being migrated to the first storage device is set in the second storage device.
The communication method according to attachment 20.
(Appendix 22)
When the second storage device receives a second access from the second node while the second storage device receives the data from the first storage device,
Transmitting information for the second access to the first storage device to the second node;
The communication method according to any one of appendices 18 to 21.
(Appendix 23)
A first node;
A second node;
A first storage device;
A communication system program having a second storage device,
The first storage device
Storing data accessible by the first node and the second node;
Sending the data to a second storage device;
The second storage device is
Storing the data received from the first storage device;
In the case where the first node is connected to the first storage device, and the second node changes the connection destination from the first storage device to the second storage device,
Detecting that a difference to the data has occurred due to an access from the second node;
Transmitting difference data relating to the difference to the first storage device;
That
A program to be executed by a computer.
(Appendix 24)
The first storage device
After transmitting the data to the second storage device and detecting that a difference to the data has occurred,
Transmitting difference data relating to the difference detected by the first storage device to the second storage device;
The program according to attachment 23.
(Appendix 25)
The difference data detected by the first storage device is
In correspondence with the first identification information, stored in the first storage device,
The difference data detected by the second storage device is
In association with the second identification information, stored in the second storage device,
The program according to attachment 24.
(Appendix 26)
The first identification information or the second identification information is:
Dirty bit,
The program according to attachment 25.
(Appendix 27)
When the first storage device performs the transmission,
Information indicating that data is being transferred to the second storage device is set in the first storage device,
When the second storage device performs the transmission,
Information indicating that data is being migrated to the first storage device is set in the second storage device.
The program according to attachment 26.
(Appendix 28)
The second storage device is
When receiving the second access from the second node while receiving the data from the first storage device,
Transmitting information for the second access to the first storage device to the second node;
28. The program according to any one of appendices 23 to 27.
(Appendix 29)
Receiving data accessible from the first storage device by the first node and the second node;
In the case where the first node is connected to the first storage device and the second node changes the connection destination from the first storage device to the second storage device,
Detecting that a difference to the data has occurred due to an access from the second node;
Transmitting difference data relating to the difference to the one storage device;
A program that causes a computer to execute.
(Appendix 30)
For the difference data,
Identification information for identifying the difference data is set.
The program according to appendix 29.
(Appendix 31)
The identification information is
Dirty bit,
The program according to attachment 30.
(Appendix 32)
When the transmission is performed,
Information indicating that data is being migrated to the first storage device is set in the second storage device.
The program according to appendix 31.
(Appendix 33)
When the second storage device receives a second access from the second node while the second storage device receives the data from the first storage device,
Transmitting information for the second access to the first storage device to the second node;
The program according to any one of appendices 29 to 32.

HSS home subscriber server DB integrated database STP signal relay station SLF subscriber management node 11 DB interface 12 storage unit 13 processor 14 SLF interface 15 STP interface 21 HSS interface 22 storage unit 23 processor 24 SLF interface 25 STP interface 100 storage device 101 storage Unit 102 Processor 103 Interface

Claims (10)

A first node;
A second node;
A first storage device;
A communication system having a second storage device,
The first storage device
Storing data accessible by the first node and the second node;
Sending the data to a second storage device;
The second storage device is
Storing the data received from the first storage device;
In the case where the first node is connected to the first storage device, and the second node changes the connection destination from the first storage device to the second storage device,
Detecting that a difference to the data has occurred due to an access from the second node;
Transmitting difference data relating to the difference to the first storage device;
Communications system. The first storage device
After transmitting the data to the second storage device and detecting that a difference to the data has occurred,
Transmitting difference data relating to the difference detected by the first storage device to the second storage device;
The communication system according to claim 1. The difference data detected by the first storage device is
In correspondence with the first identification information, stored in the first storage device,
The difference data detected by the second storage device is
In association with the second identification information, stored in the second storage device,
The communication system according to claim 2. At least one of the first identification information or the second identification information is:
Dirty bit,
The communication system according to claim 3. When the first storage device performs the transmission,
Information indicating that data is being transferred to the second storage device is set in the first storage device,
When the second storage device performs the transmission,
Information indicating that data is being migrated to the first storage device is set in the second storage device.
The communication system according to claim 4. The second storage device is
When receiving the second access from the second node while receiving the data from the first storage device,
Transmitting information for the second access to the first storage device to the second node;
The communication system according to any one of claims 1 to 5. A storage configured to store data received from the other storage device and accessible by the first node and the second node;
In the case where the first node is connected to the other storage device and the second node changes the connection destination from the other storage device to the own device,
A processor configured to detect that a difference to the data has occurred due to an access from the second node;
An interface configured to transmit difference data relating to the difference to the other storage device;
A storage device. A first node;
A second node;
A first storage device;
A communication method of a communication system having a second storage device,
The first storage device
Storing data accessible by the first node and the second node;
Sending the data to a second storage device;
The second storage device is
Storing the data received from the first storage device;
In the case where the first node is connected to the first storage device, and the second node changes the connection destination from the first storage device to the second storage device,
Detecting that a difference to the data has occurred due to an access from the second node;
Transmitting difference data relating to the difference to the first storage device;
Communication method.
The communication method according to any one of appendices 12 to 16. Receiving data accessible from the first storage device by the first node and the second node;
In the case where the first node is connected to the first storage device and the second node changes the connection destination from the first storage device to the second storage device,
Detecting that a difference to the data has occurred due to an access from the second node;
Transmitting difference data relating to the difference to the first storage device;
Communication method. Receiving data accessible from the first storage device by the first node and the second node;
In the case where the first node is connected to the first storage device and the second node changes the connection destination from the first storage device to the second storage device,
Detecting that a difference to the data has occurred due to an access from the second node;
Transmitting difference data relating to the difference to the one storage device;
A program that causes a computer to execute.

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