JP2016167670A - Communication device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To suppress processing delay when a stateful communication protocol is used for a control protocol of a device which belongs to a home network, while being a communication device such as a Home Gateway (HGW) in which flexible mounting property is achieved by virtual machines and modules.SOLUTION: A communication device has a first information management section which associates device identification information uniquely showing a module which is executed on a virtual machine and controls a service to be provided to a device belonging to a home network and a device which is mounted in a native language different from the module and belongs to the home network and reference information used for controlling a service by the module to hold them, and the information is stored in a nonvolatile memory 13. The communication device also has a second information management section which associates device identification information and the reference information to hold them, on the virtual machine, and the information is stored in a main storage device 12 (volatile memory). A module 17 uses a second information management section 24 preferentially than a first information management section 23.SELECTED DRAWING: Figure 5

Description

  The present invention relates to a communication device such as a home gateway (HGW) that interconnects a home network and an external network.

  In recent years, this type of communication device is added not only with a function as a broadband router for interconnecting a home network and an external network, but also with a function for controlling services provided to various devices belonging to the home network. (For example, Patent Document 1).

  Various wireless communication standards have been developed as a method for connecting communication devices such as HGW and home devices, and devices connected to home networks are expected to diversify in the future. In addition, the device usage status at each home is economically useful as big data, and the data acquired from each home device is collected on a cloud server, and a wide variety of services are developed to meet individual user needs. Is also expected to occur. A communication device such as an HGW is required to have a mechanism that can cope with an increase in devices without upgrading the firmware, and various communication protocols used for communication between devices in a home network have been developed.

  For example, in a communication device such as an HGW, a virtual machine is mounted and a function is added by a module operating on the virtual machine in order to realize flexible software mountability corresponding to various protocols and devices. . In the field of HGW, a Java (registered trademark) virtual machine (JVM) is generally used as a virtual machine, and a module for providing a service is mounted as a Java module.

  In addition, a stateful communication protocol is generally adopted as a control protocol for devices belonging to the home network. For example, the Echonet Lite standard (Echonet Consortium) is a standard protocol for domestic HEMS (Home Energy Management System).

  In the stateful communication protocol, even if the instruction code has a simple meaning such as “OK” or “ON”, the meaning changes depending on the context. The module determines its own processing content by making a determination in consideration of the current state of the device. For this reason, information used by the module for service control, such as state information indicating the current state of the device, is held as reference information that can be provided to the module as needed. If necessary, reference information must be obtained.

JP 2012-124567 A

  The inventors of the present application have confirmed through experiments how the processing time of the communication device is affected when the module mounting and the holding of reference information are realized by a communication device such as an HGW as described above. In the experiment, a JVM and a Java module for device control using a stateful protocol are mounted on the HGW, and a database for storing reference information is mounted in a native language different from the Java module, and the reference information is nonvolatile. Stored in the memory. The device control content by the Java module is to perform processing for adding a specific prefix to the SIP message in SIP (Session Initiation Protocol) communication. As a result of the experiment, when this additional process was performed, a delay of nearly 40% occurred at the maximum as compared with the SIP message process without the additional process. As a result of investigating the cause of such a delay, when the Java module obtains the reference information stored in the database, the data transfer between the Java module and the database via the JNI (Java Native Interface) is slow. In general, it has been found that the data transfer is performed many times for state management.

  Therefore, the problem to be solved by the present invention is a case where a stateful communication protocol is used as a control protocol for a service for a device belonging to a home network while using a communication device such as an HGW that realizes flexible mounting by a virtual machine and a module. Is to suppress the processing delay.

The present invention for solving the above-mentioned problem is provided with a module which is mounted to operate on a virtual machine and which controls a service provided to a device belonging to a home network, and interconnects the home network and an external network. A device, which is implemented in a native language different from that of the module and first stores device identification information uniquely indicating a device belonging to the home network and reference information used for controlling the service by the module in association with each other. An information management unit; and a non-volatile memory in which information held in the first information management unit is stored. This makes it possible to hold the reference information for each device without any problem even when the power is cut off due to a power failure, firmware upgrade, or the like. Therefore, it is possible to cope with a case where a stateful communication protocol is used as a control protocol for a service for a device while realizing a flexible mounting property by a virtual machine and a module.
Furthermore, a communication device according to the present invention is mounted so as to operate on the virtual machine, and a second information management unit that holds the device identification information and the reference information in association with each other, and the second information management And a volatile memory in which information held in the unit is stored. Thereby, for the reference information held in the second information management unit, the reference from the module can be completed on the virtual machine.
Here, the module according to the present invention uses the second information management unit preferentially over the first information management unit. As a result, with respect to the reference information held in the second information management unit, the module does not need to use the first information management unit in the native area that requires a relatively long time for reference. For this reason, even when a stateful communication protocol is used, processing delay can be suppressed.

  As described above, the present invention suppresses a processing delay when a stateful communication protocol is used as a control protocol of a device belonging to a home network while using a communication device such as an HGW that realizes flexible mounting by a virtual machine and a module. Can do.

The block diagram which shows the main hardware resources of the communication apparatus which concerns on the Example of this invention The conceptual diagram which shows the main software resources regarding the virtual machine mounted in the communication apparatus of FIG. Conceptual diagram of the table of the first information management unit of FIG. Conceptual diagram of the table of the second information management unit of FIG. The flowchart which shows the process at the time of the module of FIG. 2 selecting a reference destination The flowchart which shows the process at the time of the update of the 1st information management part of FIG. The flowchart which shows the process at the time of replication from the 1st information management part of FIG. 2 to the 2nd information management part (A) is a conceptual diagram showing the table of the first information management unit in the initial stage showing the processing of FIG. 7 as a specific example, (b) is a conceptual diagram showing the result of sorting the table from (a) Flowchart at the time of processing for rebuilding the table of FIG. 4 when the module of FIG. 2 is started FIG. 3A is a flowchart illustrating an operation example in which the module in FIG. 2 uses the second information management unit, and FIG. 2B is a flowchart illustrating an operation example in which the module in FIG. 2 uses the first information management unit.

Embodiments of the present invention will be described below.
In the communication device according to the first embodiment, the first information management unit and the second information management unit synchronize independently with processing that responds to a request from the module.
The module corresponding to the stateful protocol may make an update request to reflect the processing contents of the first or second information management unit to be used as necessary. In addition, the first information management unit may be updated from the external network for reference information, new device registration, and the like. Considering these, it is preferable to keep the first information management unit stored in the nonvolatile memory in a master state by synchronization between the first information management unit and the second information management unit. In the first embodiment, since the synchronization processing of the first information management unit and the second information management unit and the processing responding to the request from the module are independent, processing delay on the module side can be avoided.

In the communication device according to the second embodiment, the first information management unit holds the frequency information indicating the usage frequency for each device and the device identification information in association with each other, and reflects the order in which the usage frequency is high. The reference information to be copied to the second information management unit is selected according to the priority rule.
In a communication device such as an HGW, a non-volatile memory is usually mounted with a larger capacity than a volatile memory, so that it is easy to ensure a sufficient memory capacity for the first information management unit. On the other hand, the capacity of the volatile memory allocated for the second information management unit differs depending on the usage status of other software operating on the communication device, and all the references of the first information management unit are limited under the limitation of the volatile memory capacity. There may be a case where the second information management unit cannot hold the usage information and the reference information to be copied from the first information management unit to the second information management unit must be selected. In the second embodiment, in the selection of the duplication target, the difference in the frequency of use between the devices, which varies depending on the type of device and the lifestyle of the home, is reflected, and the one with high use frequency is preferentially treated. It is possible to easily generate a use opportunity of the second information management unit by the module under the limitation of the memory capacity.

In the communication device according to the third embodiment, the first information management unit associates the ranking information indicating the priority for duplicating the reference information with the second information management unit and the device identification information. The reference information to be copied to the second information management unit is selected according to a priority rule that preferentially reflects the order of priority higher than the usage frequency.
Various devices are connected under the control of communication devices, so in communication devices based on criteria that evaluate safety, delay tolerance, and other attributes that are more important than frequency of use according to the type and status of the device. It is preferable to select whether or not to be a target of high-speed processing. In the third embodiment, when selecting the above-mentioned replication target, it is possible to preferentially select a high-priority item evaluated based on a criterion other than the use frequency, and make it a target for high-speed processing.

  Hereinafter, an embodiment of the present invention will be described with reference to the accompanying drawings. FIG. 1 shows the gist of hardware resources of the communication device 1, and FIG. 2 shows the gist of software resources. The communication device 1 is configured as a home gateway (HGW) installed in an end user's house. The communication device 1 functions as a router for interconnecting a home network 2 constructed as a home LAN (Local Area Network) and an external network 3 serving as a WAN (Wide Area Network). Yes.

  The communication device 1 stores a central processing unit (CPU) 11, a main storage device 12, a nonvolatile memory 13, hardware resources such as a LAN side communication device 14, a WAN side communication device 15, and the nonvolatile memory 13. And various software resources that are loaded into the main storage device 12 and executed by the central processing unit 11.

  The communication device 1 accommodates one end of an IP telephone service and has a function of transmitting and receiving a SIP (Session Initiation Protocol) packet.

  The external network 3 is a public network such as an optical communication network or a public telephone network, and is generally used as an access network to the Internet. The WAN side communication device 15 is connected to a line terminating device (not shown) on the user home side of the external network 3. The line termination device may be mounted on the communication device 1.

  The home network 2 is a LAN constructed under the communication device 1. Devices 4 to 8 belonging to the home network 2 are connected to the LAN side communication device 14. The transmission medium between the LAN side communication device 14 and the devices 4 to 8 may be either wired or wireless.

  The central processing unit 11 is a multi-core processor having a main processor and a plurality of sub processors, and can execute parallel processing by assigning predetermined processing to each sub processor.

  The main storage device 12 includes a volatile memory that can hold information only when power is supplied. The nonvolatile memory 13 can hold information even when power is not supplied, and has a large capacity and a low speed with respect to the main storage device 12. For example, a flash memory or a hard disk drive is used as the nonvolatile memory 13.

  Software resources stored in the non-volatile memory 13 include firmware (not shown) that directly controls hardware resources, an OS (Operating System), a virtual machine 16 that operates as a platform, and a module that operates on the virtual machine 16 17 etc. are mounted.

  The virtual machine 16 constructs a platform-independent virtual execution environment, executes a module 17 described in a predetermined object-oriented language, and can be directly interpreted and executed by the central processing unit 11. Convert to native code. For this reason, the flexible mounting property by the virtual machine 16 and the module 17 is realizable.

  The illustrated virtual machine 16 is a Java virtual machine (JVM). The module 17 is a module described in the Java language, and is configured as a bundle corresponding to the OSGi Alliance framework.

  The module 17 is software that controls services provided from the communication device 1 to the devices 4 to 8. The communication protocol related to the control of the devices 4 to 8 is stateful, but is not limited to one type. The service by the module 17 has appropriate contents for each device, such as remote control and remote monitoring of the corresponding devices 4 to 8 via the external network 3, and linkage between the devices 4 to 8 in the home network 2. The module 17 is mounted on the communication device 1 by appropriate means such as provision from the manufacturer of the devices 4 to 8, installation by the user, downloading via the external network 3, pre-installation, and the like.

  The communication device 1 decodes a message of a communication protocol related to service control for the devices 4 to 8 in the native area, reads a required description such as an instruction code and identification information for specifying the device, and passes it to the module 17. For example, the device designation described in the isub area of the SIP message and the reading process of the instruction code used for controlling the devices 4 to 8 can be mentioned.

  Further, the communication device 1 includes a first information management unit 23 and a second information management unit 24 for managing reference information used for service control by the module 17.

  The first information management unit 23 is used to control the device identification information 31 that uniquely indicates the devices 4 to 8 in the home network 2 and the service for the devices 4 to 8 based on the table T1 illustrated in FIGS. The reference information 32 to 34 is held in association with each other. The first information management unit 23 is implemented in a native language different from the module 17. Here, the native language means a language of a program (source code) that generates a native code. Information stored in the table T1 by the first information management unit 23 is stored in the nonvolatile memory 13.

  The device identification information 31 is described as an address set for the devices 4 to 8 in the home network 2. For example, when control information is added to the SIP message, the device identification information 31 is a telephone number set for the devices 4 to 8. The device identification information 31 only needs to be able to uniquely identify the correspondence between the devices 4 to 8 belonging to the home network 2 and the address in the communication device 1, and as long as this is satisfied, the device name, device model, user's It may be arbitrarily registered identification information.

  The reference information 32 is described as a stateful code that is transmitted / received when the devices 4 to 8 are controlled, such as an instruction code indicating an instruction content to the devices 4 to 8 and a status code indicating a response content from the devices 4 to 8. The

  The reference information 33 is state information indicating the current state of the devices 4 to 8.

  The reference information 34 is described as information indicating the next operation determined from the combination of the code shown in the reference information 32 and the current state of the devices 4 to 8 shown in the reference information 33. In addition, the interpretation law which guide | induces the next operation | movement from the combination is predetermined by the manufacturer etc. for every apparatus 4-8. This interpretation rule is usually implemented in the module 17, but in this example, it is also implemented in the first information management unit 23. The module 17 performs a process for executing the next operation indicated in the reference information 34. The next operation regarding the devices 4 to 8 may be determined only by the module 17. In this case, it is not necessary to store the reference information 34 in the first information management unit 23.

  The registration of the devices 4 to 8 in the first information management unit 23 may be registered as a user or automatically when the module 17 is mounted, and the manufacturer and the access network of the devices 4 to 8 may be registered as needed. It may be registered via an external network 3 from an external server such as a telecommunications carrier that operates. The reference information 32 to 34 is updated as necessary according to the determination of the module 17 or the first information management unit 23. The reference information 33 is a predetermined rule corresponding to the control protocol, such as acquisition of state information from the devices 4 to 8 by the module 17, execution results of device control by the module 17, accumulation of the above-described interpretation laws continued from the beginning, and the like. Updated based on

  The second information management unit 24 is mounted so as to operate on the virtual machine 16 as shown in FIGS. 2 and 4, and stores the device identification information 31 and the reference information 32-34 in association with each other in the table T2. To do. The information held in the table T2 by the second information management unit 24 is stored in an area allocated on the main storage device 12 composed of a volatile memory. The second information management unit 24 is described in the Java language that can be directly interpreted by the virtual machine 16.

  The module 17 confirms the state of the devices 4 to 8 as necessary, and overwrites the table T2. When the module 17 is terminated or when the memory power supply is shut off, the table T2 of the second information management unit 24 is cleared.

  The module 17 preferentially uses the second information management unit 24 over the first information management unit 23. That is, as shown in FIG. 5, when the module 17 receives a request from the devices 4 to 8 or a request from the external network 3, etc., a service control opportunity arrives, the devices 4 to 8 that are service providing destinations. The second information management unit 24 is requested to search for the reference information 32 to 34 (S1), and when the search is successful, the reference information 32 to 34 is referred to and acquired (S2). A process reflecting the above is performed (S3). On the other hand, when the search in (S1) fails, the module 17 requests the first information management unit 23 to search, and references and acquires the reference information 32-34 here (S4). The reflected process is performed (S3). When the module 17 needs to update the reference information 32 to 34 in accordance with the execution of the processing, the module 17 reflects it in the table T2 of the second information management unit 24 or the table T1 of the first information management unit 23 that is used. An update request is issued.

  The first information management unit 23 and the second information management unit 24 illustrated in FIG. 2 perform synchronization. Here, the first information management unit 23 and the second information management unit 24 synchronize independently with the processing responding to the request from the module 17. The synchronization processing and the processing responding to the request from the module 17 are assigned to different processors under the central processing unit 11 and are performed in parallel processing. The synchronization process may be performed independently by a background process with a lower priority than the process that responds to the request from the module 17.

  Due to the synchronization between the first information management unit 23 and the second information management unit 24, the first information management unit 23 stored in the nonvolatile memory 13 can be kept in the master state. The synchronization processing of the first information management unit 23 and the second information management unit 24 and the processing in which the first information management unit 23 and the second information management unit 24 respond to requests such as reference and update from the module 17 are independent. Therefore, processing delay on the module 17 side can be avoided.

  As illustrated in FIG. 3, the first information management unit 23 holds frequency information 35 indicating the usage frequency for each of the devices 4 to 8 and device identification information 31 in association with each other. The first information management unit 23 calculates the usage frequency according to a predetermined calculation rule, and writes this value as frequency information 35 in the table T1.

  For example, using the update history held by the first information management unit 23, the number of updates can be used as the number of uses for each record in the table T1. It is also possible to grasp the number of uses for each item. For example, the number of times a command is executed per day with the time cut off, such as the last month, can be counted as the number of updates of the reference information 32 indicating the command command.

The frequency of use can be obtained, for example, as a simple average, using the number of use per month / 30 days. Further, the use frequency can be obtained by the following equation 1, for example, as a moving average up to N days ago.
Formula 1: (D_n−d_i) × N_i / Σd_i
(However, D_n: range for calculating the total, d_i: 1 to N, N_i: number of uses i days ago)

  In addition to the above-mentioned examples, any statistical method may be used to determine the usage frequency. In this case, methods incorporating external factors such as season, temperature, weather, etc. The time series data may be taken into consideration.

  Further, the first information management unit 23 shown in FIGS. 2 and 3 includes ranking information 36 and 37 indicating priorities for copying the reference information 32 to 34 to the second information management unit 24, device identification information 31, and the like. Are stored in association with each other. In this example, the ranking information 36 evaluates the degree of risk according to the state of the devices 4 to 8 and assigns priority values “0” to “3” based on this. Also, the ranking information 37 evaluates the delay tolerance according to the state of the devices 4 to 8 and assigns priority values “0” to “3” based on this. The priority value is more dangerous or sensitive to delay as the number is larger. “3”: Highest priority (for example, there is a possibility of fire), “2”: Risk of failure, delay functions It is evaluated that “1”: there is a possibility of affecting the function and feeling of use, and “0”: there is no problem. These priorities are artificially evaluated in advance for each state of the devices 4 to 8, for example, and stored in the nonvolatile memory 13 in a format that can be referred to by the first information management unit 23. When the first information management unit 23 updates the reference information 33 indicating the current state of the device, the first information management unit 23 checks the priority corresponding to the updated reference information 33, and if there is a change in the priority, The ranking information 36 and 37 is written in the table T1.

  The first information management unit 23 determines a target to be copied to the second information management unit 24 based on the copy flag 38 held in association with the device identification information 31 in the table T1. The copy flag 38 may copy all the reference information 32 to 34 held in the table T1 of the first information management unit 23 to the table T2 due to a lack of memory capacity allocated for the second information management unit 24. This is for selecting which reference information 32-34 in the table T1 is to be copied when it is not possible. In the figure, the value of the copy flag 38: “1” indicates a record to be copied, and “0” indicates a record to be copied. The upper number in the table T1 to which the copy flag 38 is set to “1” is determined based on the maximum amount that can be copied to the second information management unit 24 under the limitation of the memory capacity.

  As shown in FIG. 6, the first information management unit 23 performs necessary updates on the frequency information 35 and the ranking information 36 and 37 when updating itself, such as the update accompanying the process of (S3) (S11, S12) It is determined whether or not the value has changed due to the update. If the value has changed, the process proceeds to the update process of the copy flag 38 (S13, S14). If the value does not change, the update process of the copy flag 38 is performed. If the copy flag 38 is “1”, the second information management unit 24 performs duplication. If it is “0”, the duplication is not performed (S13, S15).

  Here, the first information management unit 23 is used for reference to be copied to the second information management unit 24 according to a priority rule that reflects the order in which the usage frequency is high and the priority order in which the priority is higher than the usage frequency. Select information 32-34. That is, the communication device 1 reflects a difference in use frequency between the devices 4 to 8 that are different depending on the types of the devices 4 to 8 and the life style of the house in the selection of the copy target, and the communication device 1 has a high use frequency. Since the preferential treatment is provided, it is possible to easily generate a use opportunity of the second information management unit 24 by the module 17 under the limitation of the memory capacity of the main storage device 12 (volatile memory), and should be more important than the use frequency. Based on the criteria evaluated according to the types and states of the devices 4 to 8, it is possible to select whether or not to be a target of high-speed processing in the communication device 1 and make it a target of high-speed processing.

  In this example, emphasis is placed on safety, and in the update process of the copy flag 38, as shown in FIG. 7, the first information management unit 23 sorts higher in the order of highest priority and ranking information 36 as shown in FIG. S21), the next highest order value 37 is sorted in order from the highest value (S22), the next highest order value in the frequency information 35 is sorted (S23), and the order of records in the table T1 Confirm. Thereafter, the first information management unit 23 determines the highest number in the table T1 that is set to “1” based on the maximum amount (depending on the memory capacity) that can be copied to the second information management unit 24. Then, the copy flag 38 of the required record is rewritten (S24). In the next synchronization process, the first information management unit 23 copies only the copy flag 38 having the value “1” to the second information management unit 24 (S25).

  For example, assume that the number of permitted copy flags 38 is three and the state of the table T1 shown in FIG. Here, when the value “0” of the ranking information 36 of the device (bath) in FIG. 8A is updated to “3” as shown in FIG. 8B, the above-described (S13), (S21) ), The record of the device (bath) with the highest priority and the highest priority (36) becomes the highest record (first) in the table T1, and the copy flag 38 is changed from “0”. It is updated to “1”. On the other hand, the record of the third device (telephone) in FIG. 8A is carried down to the fourth position in FIG. 8B, so that the copy flag 38 is updated from “1” to “0”.

  If the table T2 is deleted from the main storage device 12 shown in FIG. 1 due to the firmware upgrade of the module 17 shown in FIG. 2, then the table T2 is reconstructed when the module 17 shown in FIG. At this time, in the table T1 of the first information management unit 23 stored in the nonvolatile memory 13 shown in FIG. 1, the records are arranged in the sort order according to the above-described priority rule. As shown in FIG. 9, the module 17 shown in FIG. 2 checks the table T1 of the first information management unit 23 (S31), checks the status of the devices 4 to 8 as necessary, and corrects the deviation of the status. For example, the first information management unit 23 is updated for necessary information (S32). The module 17 informs the first information management unit 23 of the memory capacity allocated to the second information management unit 24 and requests replication. The first information management unit 23 determines the copyable range according to the memory capacity, sets the required copy flag 38 to “1” (S33), and then copies it to the second information management unit 24 (S34). ).

  Note that the confirmation of the memory capacity allocated to the second information management unit 24 may be omitted in the above-described synchronization processing and startup processing. For example, the first information management unit 23 may continue the replication sequentially from the highest one sorted according to the priority order until an error is notified when the memory capacity of the second information management unit 24 is full. . In this case, the copy flag 38 can be omitted.

  An example of the operation of the communication device 1 is shown in FIG. The operation of FIG. 6A assumes a case where the module 17 performs control related to the call of the device in the IP telephone service provided to the device (telephone) belonging to the home network 2 under the communication device 1. . Here, the current state of the device is a non-connection state in which setting for using the caller ID non-notification service is made, and reference information 33 indicating this is stored in the tables T1 and T2 in FIGS. It is assumed that When the transmission instruction from the device 4 arrives at the module 17, the module 17 first searches the second information management unit 24 using the device identification information 31 of the device 4 (in this case, a telephone number because it is SIP) as a search key. It hits here (S41). The module 17 acquires the reference information 32 to 34 from the second information management unit 24, and decides to give the instruction code prefix “184” indicating the application of the non-notification service (S42). The module 17 further searches the second information management unit 24 for other numbers to be prefixed, confirms final call number confirmation (S43, S44), and then performs SIP call processing to establish a connection. Establish (S45).

  The operation example shown in FIG. 10B is a non-connection state in which the caller ID non-notification service is set in the IP telephone service that is also provided to the device (telephone), and reference information indicating this is shown. It is assumed that 33 is held only in the table T1 of FIG. In the case of FIG. 5B, when a transmission instruction from the device 4 arrives at the module 17, the module 17 first searches the second information management unit 24, but does not hit here, and the first information management unit 23. To obtain reference information 32-34 (S51), and after determining to give the prefix "184" (S52), the first information management unit 23 is further searched to confirm final caller ID Later (S53, S54), SIP transmission processing is performed (S55). Comparing these operation examples, in the case of FIG. 8A, the module 17 can obtain the reference information 32-34 from the second information management unit 24 operating on the virtual machine 16, and FIG. Compared to the case, the use of the first information management unit 23 in the native area can be reduced, and the processing delay can be suppressed.

  The technical scope of the present invention is not limited to the above-described embodiments and examples, but includes all modifications within the scope of the technical idea based on the description of the scope of claims.

DESCRIPTION OF SYMBOLS 1 Communication apparatus 2 Home network 3 External network 4-8 Equipment 12 Main memory (volatile memory)
13 Non-volatile memory 16 Virtual machine 17 Module 23 First information management unit 24 Second information management unit 31 Device identification information 32-34 Reference information 35 Frequency information 36, 37 Ranking information

Claims (4)

In a communication device that is executed on a virtual machine and includes a module that controls a service provided to a device belonging to a home network, and interconnects the home network and an external network,
A first information management unit that is implemented in a native language different from that of the module and that stores device identification information that uniquely indicates a device that belongs to the home network and reference information that is used by the module to control the service When,
A non-volatile memory in which information stored in the first information management unit is stored;
A second information management unit that is mounted to operate on the virtual machine and holds the device identification information and the reference information in association with each other;
A volatile memory in which information stored in the second information management unit is stored,
The communication device, wherein the module preferentially uses the second information management unit over the first information management unit.   The communication device according to claim 1, wherein the first information management unit and the second information management unit synchronize independently with a process responding to a request from the module.   The first information management unit holds the frequency information indicating the usage frequency for each device and the device identification information in association with each other, and the second information management unit uses a priority rule that reflects the order of the highest usage frequency. The communication device according to claim 1, wherein the reference information to be copied is selected.   The first information management unit holds the ranking information indicating the priority of copying the reference information to the second information management unit and the device identification information in association with each other, and the priority over the usage frequency. The communication device according to claim 3, wherein the reference information to be copied to the second information management unit is selected according to a priority rule that preferentially reflects the descending order.

Images