JP2019139639A - Information management device and information management method - Google Patents

Abstract

To reduce processing loads on information-centric networking.SOLUTION: An information management device 100, which manages content information, comprises: a Network Certification Service (NCS) 33 that associates a Global Unique Identifier (GUID) with a name of the content information; and a Global Name Service (GNS) 34 that associates a Network Address (NA) with the GUID. A local management unit 32 in the information management device 100 comprises: a data area analysis unit 321 that classifies the content information on the basis of a valid term of the content information and a number of creations thereof per a unit time; and a live data accumulation unit 324 that, when the valid term of the content information is less than a first threshold, and the number of creations thereof is equal to or more than a second threshold, accumulates the content information as live data. The NCS 33 associates a GUIDx with designation information on the live data accumulation unit 324, and the GNS 34 associates a NAx with the GUIDx, and thereby the live data is managed.SELECTED DRAWING: Figure 1

Description

  The present invention relates to an information management apparatus and an information management method.

  The current Internet specifies a URL (Uniform Resource Locator), which is the location information of the server that holds the desired content, based on the TCP (Transmission Control Protocol) / IP (Internet Protocol) protocol, and converts it into an IP address. This is a host-oriented network that accesses content. However, the spread of user-centered information transmission services such as mobile terminals such as smartphones and SNS (Social Networking Service) has spurred an increase in Internet traffic, and the network usage form makes the location of terminals and hosts conscious. Instead, it has changed to a usage form for acquiring desired content.

  Information-oriented network (hereinafter referred to as ICN) is an architecture that solves such network usage and architecture divergence (the divergence between the architecture that is conscious of the location of terminals and hosts and the architecture that is unaware of the location of terminals and hosts). (Sometimes called Information-Centric Networking). Unlike TCP / IP, which is a host-oriented network protocol, ICN is a content-oriented network.

  ICN enables communication with a device without specifying the IP address of the device (such as a server). In particular, in a mobile environment where network topology changes frequently, ICN that does not depend on the network address is effective. Further, in the ICN, the content is cached in the communication device near the user by the content caching function, so that the content can be acquired at higher speed and the load on the server can be distributed.

  Among the ICN research projects, Mobility First shown in Non-Patent Document 1 is a project that proposes an architecture that focuses on mobility of devices and contents. In MobilityFirst, a globally unique identifier (GUID) based on a public key is assigned to every object connected to a network.

Raychaudhuri, D. et. Al ”MobilityFirst: A Robust and Trustworthy Mobility-Centric Architecture for the Future Internet”, ACM SIGMobile Mobile Computing and Communication Review, Volume 16 Issue 3, July 2012, p2-p13

A conventional example of the MobilityFirst architecture will be described with reference to FIG.
The registrant terminal 11 assigns a human-identifiable name “Content Name n” to the content information 12 to be registered, and a global identifier assignment search unit (hereinafter sometimes referred to as NCS: Network Certification Service) 13. Register with. The NCS 13 assigns and registers a globally unique identifier “GUID n” based on the public key to the name “Content Name n” to be registered. The network address search unit (hereinafter also referred to as GNS: Global Name Service) 14 acquires “GUID n” from the NCS 13, and acquires the acquired “NAD” as the network address “NA n” that is the location information of the content information 12. Associate GUID n ”.

  When the user terminal 21 transmits the name “Content Name n” of the content information 12 to be accessed to the NCS 13, the user terminal 21 acquires “GUID n” as a response. Next, the user terminal 21 transmits the packet 25 in which “GUID n” is set in the header of the packet 25 to the network. The edge router 22 that has received the packet 25 transmits “GUID n” set in the header of the packet 25 to the GNS 14 and acquires “NA n” associated with “GUID n” as a response. The edge router 22 sets “GUID n” and “NA n” in the header of the packet 26 having the same payload as the packet 25. The packet 26 is transferred hop-by-hop in the order of the edge router 22 → core router 23 → edge router 24, so that the user terminal 21 can access the content information 12.

  As described above, in MobilityFirst, it is necessary to assign a GUID to every object (content information 12 or the like) connected to the network, and to associate a network address (NA) that is the position information of the object with each. For this reason, the amount of information managed by NCS and GNS is enormous, and an increase in delay time due to search processing becomes a major issue.

In addition, as many as 50 billion Internet of Things (IoT) devices are expected to spread in the future, and most of the so-called live data that each IoT device always generates is invalidated and discarded after a certain period of time. is assumed. However, in the conventional MobilityFirst, it is necessary to perform GUID assignment and NA association as described above for all generated live data, and it is also necessary to discard invalidated live data. As a result, there is a problem that the load of NCS and GNS is greatly increased.
The above-mentioned problem applies not only to the exemplified MobilityFirst architecture but also to all architectures constructed for information-oriented networks.

  In view of such a background, an object of the present invention is to reduce a processing load on an information-oriented network.

  In order to solve the above-described problem, the invention according to claim 1 includes a global identifier assigning search unit that associates a global identifier with a name of content information, and a network address search unit that associates a network address with the global identifier. An information management apparatus for managing the content information, wherein the content information is classified based on a valid period and the number of generations per unit time of the content information, and the content information A live data storage unit that stores the content information as live data when the validity period is less than a first threshold and the number of generations is greater than or equal to a second threshold; Associates the first global identifier with the specified information of the live data storage unit The network address search unit to manage the live data by attaching the cord to the first network address to the first global identifier, characterized in that.

  The invention according to claim 8 is an information management method in an information management apparatus for managing content information, wherein the information management apparatus sets the content information to a valid period and the number of generations per unit time. Based on the step of classifying the content information, and when the validity period of the content information is less than a first threshold and the number of generations is greater than or equal to a second threshold, the content information is set as live data Managing the live data by executing a step of storing in a live data storage unit, a step of associating a global identifier with designation information of the live data storage unit, and a step of associating a network address with the global identifier. It is characterized by that.

According to the first and eighth aspects of the invention, the global identifier is associated with the live data storage unit, but the global identifier is not associated with the live data accumulated in the live data storage unit. For this reason, it is possible to reduce the processing load of the global identifier assignment search unit and the processing load of the network address search unit, and to reduce the processing load of content information.
Therefore, the processing load on the information-oriented network can be reduced.

  The invention according to claim 2 is the information management device according to claim 1, wherein the validity period of the content information is less than a first threshold and the number of generations is equal to or greater than a second threshold. If not, a static data storage unit that stores the content information as static data is further provided, wherein the global identifier assignment search unit associates a second global identifier with the name of the static data, and the network The address search unit manages the static data by associating a second network address with the second global identifier.

  According to the second aspect of the present invention, it is possible to maintain the management quality of static data that requires the association of global identifiers.

  The invention according to claim 3 is the information management device according to claim 2, wherein the access frequency analyzing unit that analyzes the access frequency of the content information, and the access frequency is equal to or less than a third threshold value. And a data discard unit that discards the content information.

  According to the third aspect of the present invention, it is possible to reduce the processing load of the global identifier assignment search unit and the processing load of the network address search unit by discarding the content information with low access frequency. The processing load can be reduced.

  The invention according to claim 4 is the information management device according to claim 3, wherein the access frequency analysis unit is configured to provide a fourth threshold value in which the access frequency of the content information is larger than the third threshold value. In addition, when the content information is the live data, the content information is changed from the live data to the static data.

  According to the fourth aspect of the present invention, it is possible to avoid discarding live data with high utility value by making live data with high access frequency static data.

  The invention according to claim 5 is the information management apparatus according to any one of claims 1 to 4, wherein the search target data name obtained from the user terminal, the live data storage unit A first search for live data of the data name using the first global identifier associated with the designation information and the first network address associated with the first global identifier. The live data search unit is further provided.

  According to the fifth aspect of the present invention, it is possible to realize a search for live data in which the processing load of the global identifier assignment search unit and the processing load of the network address search unit are reduced.

  The invention according to claim 6 is the information management apparatus according to claim 5, wherein the first live data search unit and a plurality of second data different from the first live data search unit are provided. Are present in different areas, and the first live data search unit cannot search for the live data of the search target data name, the user terminal The second live data search unit searches for live data with the data name by broadcasting the data name to be searched to the data search unit.

  According to the sixth aspect of the present invention, it is possible to more reliably realize live data search.

  The invention according to claim 7 is the information management device according to claim 6, wherein when the live data cannot be searched by the broadcast, the first live data search unit assigns the global identifier. The live data with the data name, which has become static data, is searched by referring to the search unit.

  According to the seventh aspect of the present invention, it is possible to more reliably realize live data search.

  According to the present invention, the processing load on the information-oriented network can be reduced.

It is an example of the functional block diagram of the information management apparatus of this embodiment. It is explanatory drawing of data area determination by a data area analysis part. It is explanatory drawing of access frequency determination by a data access frequency analysis part. It is explanatory drawing of the broadcast with respect to several live data search part. It is a flowchart of a content information registration process. It is a flowchart of an access frequency determination process. It is a flowchart of a live data search process. It is an example of the conventional block diagram in the architecture of MobilityFirst.

  DESCRIPTION OF EMBODIMENTS Hereinafter, a mode for carrying out the present invention (hereinafter referred to as “the present embodiment”) will be described with reference to the drawings.

≪Configuration≫
As shown in FIG. 1, the information management apparatus 100 according to the present embodiment includes a local data management unit 32, an NCS (global identifier assignment search unit) 33, a GNS (network address search unit) 34, and a live data search unit 35. With. The information management apparatus 100 includes hardware such as an input / output unit, a processing unit, and a storage unit, and a CPU that is a specific example of the processing unit executes a program read on a memory that is a specific example of the storage unit. Thus, the method of this embodiment is realized.

  The registrant terminal 31 shown in FIG. 1 is a computer operated by a registrant of content information. The registrant terminal 31 can register content information (not shown) on the local network.

  A user terminal 41 shown in FIG. 1 is a computer operated by a user who uses content information. The user terminal 41 can access the content information by transferring the packet hop-by-hop via a router or the like (not shown) arranged on the local network.

  The local data management unit 32 manages content information registered on the local network by the registrant terminal 31 as local data. The local data management unit 32 functions as a registration place for a registrant of the registrant terminal 31 to register its own content information. The local data management unit 32 may be installed in the local network as in the present embodiment, or may be installed in the registrant terminal 31. The local data management unit 32 includes a data area analysis unit 321, a data storage unit 322, a data access frequency analysis unit 325, and a data discard unit 326.

The data area analysis unit 321 performs data area determination of local data managed by the local data management unit 32 and classifies the local data. Specifically, as shown in FIG. 2, the valid period (seconds) of local data is less than (or less than) the threshold value α (first threshold value), and the number of local data generated per unit time is the threshold value β. When local data is included in the live data area that is equal to or greater than (second threshold) (or exceeds β), the local data management unit 32 determines that the local data is live data. Live data is, for example, video data from surveillance cameras and drive recorders, and sensor data from IoT devices. Further, the valid period (seconds) of local data is less than the threshold value α (first threshold value) (or less than α), and the number of local data generated per unit time is equal to or greater than the threshold value β (second threshold value) (or β When the local data is included in the static data area that is not greater than (), the local data management unit 32 determines that the local data is static data.
A technique for analyzing the local data to determine the effective period (seconds) and the number of generations per unit time is well known, and the description thereof will be omitted.

  The data storage unit 322 stores the local data that has been subjected to the data region determination by the data region analysis unit 321. The data storage unit 322 includes a static data storage unit 323 and a live data storage unit 324. The static data storage unit 323 stores the static data determined by the data area analysis unit 321. The live data accumulation unit 324 accumulates live data determined by the data area analysis unit 321. In addition, accumulation | storage of static data and live data is performed periodically (at predetermined time intervals), for example.

Returning to FIG. 1, the data access frequency analysis unit 325 analyzes the access frequency of the local data stored in the data storage unit 322 and determines the access frequency of the access from the user. Specifically, as shown in FIG. 3, when the access frequency of local data is less than or equal to a threshold γ (third threshold) (or less than γ), the data access frequency analysis unit 325 discards the local data. Is determined. If the access frequency of local data is equal to or greater than the threshold δ (> γ) (fourth threshold) (or exceeds δ), and the local data is live data, the data access frequency analysis unit 325 The local data is migrated (upgraded) to static data.
Note that the technique for obtaining the access frequency for local data is well known, and a description thereof will be omitted.

  Returning to FIG. 1, the data discarding unit 326 discards the local data to be discarded. The local data to be discarded are local data whose valid period has expired, and local data whose valid period has not expired but whose data access frequency analysis unit 325 has determined that the access frequency is equal to or less than the threshold value γ.

  The NCS 33 gives a GUID to local data managed by the local data management unit 32. As shown in FIG. 1, the NCS 33 has a table 33a. The table 33a is a table for associating and registering the data name of local data (for example, “Content name n”) and the GUID number (for example, “GUID n”).

  When the local data management unit 32 is installed in response to a request from the registrant terminal 31, the NCS 33 registers the live data storage unit 324 in the table 33a. Specifically, the NCS 33 assigns (assigns) a unique GUID “GUID x” (first global identifier) to the live data storage unit 324, and designates the live data storage unit 324 specification information (eg, live) in the table 33a. The data storage unit 324 is registered in association with the name or ID (not shown). Further, the NCS 33 registers a data name in the table 33a and assigns a unique GUID (second global identifier) to the static data stored in the static data storage unit 323, and assigns the static data to the table 33a. Register in association. When the data access frequency analysis unit 325 migrates (upgrades) live data to static data, the NCS 33 assigns a unique GUID to the migrated static data and registers it in the table 33a. Further, the NCS 33 transmits the assigned GUID to the GNS 34.

  The GNS 34 associates a network address (NA) with the GUID assigned by the NCS 33. By managing GUID and NA for the registered local data, the management of the local data is realized. As shown in FIG. 1, the GNS 34 has a table 34a. The table 34a is a table for associating and registering a GUID name (eg, “GUID n”) and an NA number (eg, “NA n”). When the NCS 33 assigns a unique GUID “GUID x” to the live data storage unit 324, the GNS 34 acquires “GUID x” from the NCS 33, and specifies the specified information of the live data storage unit 324 in the acquired “GUID x”. A unique NA “NA x” (first network address) is linked to “GUID x” and “NA x” in association with each other and registered in the table 34a. When the data access frequency analysis unit 325 migrates (upgrades) live data to static data, the NCS 33 associates the NX unique to the GUID assigned to the migrated static data and registers it in the table 34a.

  The live data search unit 35 (first live data search unit) processes the search for live data by the user terminal 41. The live data search unit 35 manages live data to be searched by the user terminal 41, and particularly manages local live data with high access frequency. The live data search unit 35 functions as a database for searching for live data that the user of the user terminal 41 wants to access. The live data search unit 35 may be installed in the local network as in the present embodiment, or may be installed in the user terminal 41.

  As shown in FIG. 1, the live data search unit 35 has a table 35a. The table 35a includes the data name of live data stored in the live data storage unit 324 (for example, “Content name x”), the GUID number assigned to the live data storage unit 324 by the NCS 33 (for example, “GUID x”), and the like. It is a table for associating and registering.

  “Content name x” is the data name of the live data stored in the live data storage unit 324. When the user terminal 41 transmits the content name “Content name x” of the live data to be accessed to the live data search unit 35, the user terminal 41 can acquire “GUID x” indicating the live data storage unit 324 as a response. . Next, when “GUID x” acquired from the live data search unit 35 is transmitted to the GNS 34, the user terminal 41 may acquire “NA x” associated with “GUID x” as a response. it can. Thereafter, the user terminal 41 sends “Content name x”, “GUID x” acquired from the live data search unit 35, and “GUID x” acquired from the GNS 34 to the live data storage unit 324 via the live data search unit 35. When “NA x” is transmitted, desired live data can be acquired from the live data storage unit 324. As described above, live data search is realized for the data name to be searched.

  If the user terminal 41 cannot acquire the desired live data from the live data storage unit 324 in the above procedure, it is caused by the movement of the local data management unit 32 accompanying the movement of the registrant terminal 31. , GUID and NA association may have been changed. In this case, as shown in FIG. 4, all the live data search units 35, 35-1, 35-2, and 35-3 existing in the local network are broadcasted from the user terminal 41 to “Content name”. Send "x". However, since the live data search unit 35 is a live data search unit in which acquisition of desired live data could not be realized, it may be excluded from broadcasting.

The live data search units 35-1, 35-2, and 35-3 (second live data search units) include a plurality of user terminals (not shown) different from the user terminal 41 that uses the live data search unit 35, respectively. This is a live data search unit to be used. The live data search units 35, 35-1, 35-2, and 35-3 exist in different areas, for example, and receive live data search requests from user terminals of users located in various areas.
There is a possibility that at least one of the live data search units 35, 35-1, 35-2 and 35-3 has registered a new GUID associated with “Content name x”. For example, when the live data search unit 35-1 has registered a new GUID associated with “Content name x”, the user terminal 41 may acquire a new GUID from the live data search unit 35-1. In addition, the NA associated with the new GUID can be acquired from the GNS 34. As a result, the user terminal 41 can acquire desired live data from the destination live data storage unit using “Content name x”, the acquired new GUID, and the acquired NA. As described above, a search for live data with a search target data name is realized by broadcasting.

  The live data search units 35-1, 35-2, and 35-3, the destination live data storage unit included in the destination local data management unit 32 accompanying the movement of the registrant terminal 31, and the destination Each functional unit included in the local data management unit 32 is a functional unit included in the information management apparatus 100.

  If the user terminal 41 cannot obtain desired live data from the live data storage unit 324 by the broadcast, the desired live data is upgraded to static data to which a GUID is assigned by the NCS 33. May have been. In this case, the user terminal 41 may access the static data existing on the local network according to a procedure similar to that of the conventional example already described (see FIG. 8). As a result, it is possible to search for live data having a data name to be searched that has been upgraded to static data.

<< Process >>
Processing executed by the information management apparatus 100 of this embodiment will be described. The processes executed by the information management apparatus 100 include a content information registration process, an access frequency determination process, and a live data search process, and these processes will be described.

<Content information registration process>
First, content information registration processing will be described with reference to FIG. The content information registration process starts when the information management apparatus 100 acquires a content information registration request from the registrant terminal 31.

  First, the information management apparatus 100 installs the local data management unit 32 for the registrant of the registrant terminal 31 that has requested registration (step A1). When installing the local data management unit 32, the information management apparatus 100 installs the data area analysis unit 321, the data storage unit 322, the data access frequency analysis unit 325, and the data discarding unit 326 already described. Further, the information management apparatus 100 installs the static data storage unit 323 and the live data storage unit 324 when the data storage unit 322 is installed.

  Next, the information management apparatus 100 assigns “GUID x” to the live data storage unit 324 by the NCS 33 (step A2). By step A2, the association between the designation information of the live data storage unit 324 and “GUID x” is registered in the table 33a. At the time of step A2, the GNS 34 acquires “GUID x” from the NCS 33, associates a unique network address “NA x” with “GUID x”, and realizes management of live data.

  Next, when content information to be registered is transmitted from the registrant terminal 31, the information management apparatus 100 performs data area determination of the content information to be registered by the data area analysis unit 321 (step A3). For the content information to be determined, when the valid period is less than the threshold value α and the number of generations per unit time is equal to or greater than the threshold value β (Yes in step A4), the information management apparatus 100 performs live content information as live data. Data is stored in the data storage unit 324 (step A5), and the content information registration process is terminated.

  On the other hand, for the content information to be determined, if the valid period is less than the threshold value α and the number of generations per unit time is not equal to or greater than the threshold value β (No in step A4), the information management apparatus 100 stores the content information Is stored as static data in the static data storage unit 323 (step A6). Thereafter, the information management apparatus 100 assigns a GUID to the static data by the NCS 33 (step A7), and ends the content information registration process.

  At step A7, the GNS 34 acquires the GUID assigned to the static data from the NCS 33, and associates the acquired GUID with a unique NA to realize the management of the static data.

According to the content information registration process of the present embodiment, the GUID is associated with the live data accumulation unit 324, but the global identifier is not associated with the live data accumulated enormously in the live data accumulation unit 324. For this reason, it is possible to reduce the processing load of the NCS 33 and the processing load of the GNS 34 (because it is not necessary to link the NA to an unassigned GUID), and the processing load of content information can be reduced.
For live data that has a large number of generations per unit time, such as video data and sensor data from surveillance cameras and drive recorders, and that has a short effective time, many users who request access to such live data are local It is assumed that the nature is strong. In other words, users who use specific live data are narrowed down to specific users and rarely used by many unspecified users. Such live data inherently lacks the need for GUID association.
Therefore, the processing load on the information-oriented network can be reduced.
In addition, it is possible to maintain the management quality of static data that requires association of global identifiers.

<Access frequency determination processing>
Next, the access frequency determination process will be described with reference to FIG. The access frequency determination process is executed periodically (at a predetermined time interval) for each data (content information) stored in the data storage unit 322.

  First, the information management apparatus 100 determines whether the access frequency of the determination target data stored in the data storage unit 322 is equal to or lower than the threshold γ by the data access frequency analysis unit 325 (step B1). When the value is equal to or less than the threshold value γ (Yes in Step B1), the information management apparatus 100 discards the data by the data discard unit 326 (Step B2), and performs an access frequency determination process for other data.

  On the other hand, if it is not equal to or less than the threshold value γ (No in step B1), the information management apparatus 100 determines whether the access frequency of the data to be determined is equal to or higher than the threshold value δ (step B3). If it is equal to or greater than the threshold δ (Yes in Step B3), the information management apparatus 100 further determines whether or not the data is live data (Step B4). When the data to be determined is stored in the live data storage unit 324, it can be said that it is live data. If it is live data (Yes in step B4), the information management apparatus 100 upgrades the data to be determined from live data to static data (step B5). The information management apparatus 100 stores the upgraded static data in the static data storage unit 323 and assigns a GUID by the NCS 33. Thereafter, the information management apparatus 100 performs an access frequency determination process for other data.

  When the access frequency of the determination target data is not equal to or higher than the threshold δ (No in Step B3), or when the access frequency is equal to or higher than the threshold δ and is not live data (No in Step B4), the information management apparatus 100 Then, nothing is performed on the data, and access frequency determination processing is performed on other data. Alternatively, if the access frequency of the data is equal to or higher than the threshold δ regardless of the type of data to be determined, the data may be static data.

  According to the access frequency determination processing of the present embodiment, the processing load of NCS 33 and GNS 34 can be reduced by discarding data with low access frequency, thereby reducing the processing amount of GUID assignment and NA association. Can be reduced. In addition, by making live data with high access frequency static data, it is possible to avoid discarding live data with high utility value.

<Live data search processing>
Next, live data search processing will be described with reference to FIG. The live data search process starts when the information management apparatus 100 acquires a live data search request from the user terminal 41 in the live data search unit 35 prepared for the user of the user terminal 41.

  First, the information management apparatus 100 acquires the data name (data name of desired live data to be searched) included in the search request from the user terminal 41 as the data name addressed to the live data search unit 35 (step C1). ). Next, by referring to the table 35a, the live data search unit 35 responds to the user terminal 41 with the GUID x assigned to the live data storage unit 324 in which the live data having the acquired data name is stored ( Step C2). The user terminal 41 transmits the GUID x acquired from the live data search unit 35 to the GNS 34 in order to acquire the NA x included in the GNS 34.

  Next, the information management apparatus 100 acquires GUID x addressed to the GNS 34 from the user terminal 41 (step C3). Next, the information management device 100 responds to the user terminal 41 with the NA x associated with the received GUID x by the GNS 34 referring to the table 34a (step C4). In order to acquire the corresponding live data stored in the live data storage unit 324, the user terminal 41 acquires the data name of the desired live data, the GUID x assigned to the live data storage unit 324, and the NA x acquired from the GNS 34. Are transmitted to the data storage unit 322 via the live data search unit 35.

  Next, the live data search unit 35 of the information management apparatus 100 acquires the data name (Content x), GUID x, and NA x addressed to the live data storage unit 324 from the user terminal 41 (step C5). Next, the live data search unit 35 determines whether or not there is live data to be searched in the live data storage unit 324 (step C6). When there is live data (Yes in Step C6), the live data search unit 35 transmits the corresponding live data to the user terminal 41 (Step C7), and ends the live data search process.

  On the other hand, when there is no live data to be searched in the live data storage unit 324 (No in step C6), GUID x and NA x are caused by the movement of the local data management unit 32 accompanying the movement of the registrant terminal 31. There is a possibility that the association with has been changed. Therefore, the information management apparatus 100 sets the search target data name by broadcast from the user terminal 41 to each of the other live data search units (refer to reference numerals 35-1 to 35-3 in FIG. 4) in the local network. (Step C8).

  It is assumed that another specific live data search unit has registered another GUID (different from GUID x) associated with the search target data name. In this case, the information management apparatus 100 responds to the user terminal 41 with the other GUID assigned to the other (destination) live data storage unit and the NA associated with the other GUID by the GNS 34. (Step C9). Here, the other live data storage unit is a data storage unit that can be referred to by another specific live data search unit. The “NA associated with another GUID” is the NA that the GNS 34 is actually associated with another GUID in the table 34a, and may be the same as or different from NA x. It may be. Since the user terminal 41 acquires the corresponding live data stored in the other live data storage unit, the data name of the desired live data, the other GUID assigned to the other live data storage unit, and the other GUID Send the NA linked to to the local network.

  Next, the information management apparatus 100 acquires, from the user terminal 41, a data name, another GUID, and NA (linked to another GUID) addressed to the local network by using another specific live data search unit (step S1). C10). Next, the specific other live data search unit determines whether there is live data to be searched in the other live data storage unit (step C11). When there is live data (Yes in Step C11), the other specific live data search unit transmits the corresponding live data to the user terminal 41 (Step C12), and ends the live data search process.

  On the other hand, if there is no live data to be searched in any other live data storage unit (No in step C11), there is a possibility that the live data to be searched has been upgraded to static data. Therefore, the live data search unit 35 acquires the data name to be searched as the data name addressed to the NCS 33 (step C13). Next, the live data search unit 35 refers to the user terminal 41 with the GUID assigned to the acquired data name (GUID newly assigned to the upgraded static data) by the NCS 33 referring to the table 33a. A response is made (step C14). The user terminal 41 transmits the GUID acquired from the NCS 33 to the GNS 34 in order to acquire the NA (NA newly associated with the GUID newly assigned to the upgraded static data) that the GNS 34 has.

  Next, the information management apparatus 100 acquires the GUID addressed to the GNS 34 from the user terminal 41 (step C15). Next, the information management apparatus 100 responds to the user terminal 41 with the NA associated with the received GUID by the GNS 34 referring to the table 34a (step C16). In order to acquire the corresponding static data on the local network, the user terminal 41 transmits the search target data name, the GUID assigned to the data name, and the NA acquired from the GNS 34 to the local network.

  Next, the live data search unit 35 of the information management apparatus 100 acquires the data name, GUID, and NA addressed to the local network from the user terminal 41 (step C17). Next, the live data search unit 35 determines whether or not the upgraded static data is on the local network (step C18). When there is upgraded static data (Yes in Step C18), the live data search unit 35 transmits the upgraded static data to the user terminal 41 based on the access from the user terminal 41 (Step C19). Then, the live data search process is terminated. Step C19 follows the conventional example already described (see FIG. 8).

  On the other hand, if the upgraded static data is not on the local network, there is a possibility that the data to be searched has been deleted, or a failure in accessing the data has occurred. Therefore, the live data search unit 35 sets an error response indicating that the search target data cannot be acquired to the user terminal 41 (step C20), and ends the live data search process.

  According to the live data search process of the present embodiment, it is possible to realize a search for live data with the processing load of the NCS 33 and the processing load of the GNS 34 reduced.

≪Others≫
(A): In the present embodiment, the local network has been described as an example, but the present invention can also be applied to other types of networks (for example, the Internet). In the present embodiment, local data is described as an example of content information. However, the present invention can also be applied to other types of data.
(B): In this embodiment, when searching for live data having a search target data name, processing is performed such that the data name, GUID, and NA are exchanged between the user terminal 41 and the information management apparatus 100. However, for example, the information management apparatus 100 that has acquired the search target data name from the user terminal 41 accesses the NCS 33 or GNS 34 in the information management apparatus 100 and reads the GUID and NA corresponding to the search target data name. Alternatively, the live data corresponding to the data name, GUID, and NA may be read out and transmitted to the user terminal 41 to search for desired live data.

A technique obtained by appropriately combining various techniques described in the present embodiment can also be realized.
The software described in this embodiment can be realized as hardware, and the hardware can also be realized as software.
In addition, hardware, software, flowcharts, and the like can be changed as appropriate without departing from the spirit of the present invention.

100 Information Management Device 31 Registrant Terminal 32 Local Data Management Unit 33 NCS (Global Identifier Assignment Search Unit)
34 GNS (Network Address Search Unit)
35 Live Data Search Unit (First Live Data Search Unit)
35-1 to 35-3 Live data search unit (second live data search unit)
41 User terminal 321 Data area analysis unit 322 Data storage unit 323 Static data storage unit 324 Live data storage unit 325 Data access frequency analysis unit 326 Data discard unit

Claims (8)

A global identifier giving search unit that associates a global identifier with a name of content information, and a network address search unit that associates a network address with the global identifier, and an information management device that manages the content information,
A data area analysis unit for classifying the content information based on the valid period of the content information and the number of generations per unit time;
A live data storage unit that stores the content information as live data when the validity period of the content information is less than a first threshold and the number of generations is greater than or equal to a second threshold;
The global identifier assignment search unit associates a first global identifier with the designation information of the live data storage unit, and the network address search unit associates the first network address with the first global identifier, thereby the live data. Manage
An information management apparatus characterized by that. A static data storage unit that stores the content information as static data when the validity period of the content information is less than a first threshold and the number of generations is not greater than or equal to a second threshold; Prepared,
The global identifier assigning search unit associates a second global identifier with the name of the static data, and the network address search unit associates the second network identifier with the second global identifier, whereby the static data is obtained. to manage,
The information management apparatus according to claim 1. An access frequency analysis unit for analyzing the access frequency of the content information;
A data discard unit that discards the content information whose access frequency is equal to or less than a third threshold;
The information management apparatus according to claim 2. When the access frequency of the content information is equal to or greater than a fourth threshold value that is greater than the third threshold value and the content information is the live data, the access frequency analysis unit From data to the static data,
The information management apparatus according to claim 3. The data name to be retrieved obtained from the user terminal, the first global identifier associated with the designation information of the live data storage unit, and the first network associated with the first global identifier A first live data search unit that searches for live data with the data name using an address,
The information management apparatus according to claim 1, wherein the information management apparatus is an information management apparatus. A plurality of second live data search units different from the first live data search unit and the first live data search unit respectively exist in different areas;
If the first live data search unit cannot search the live data having the search target data name, the user terminal sends the search target data name to the second live data search unit. By broadcasting, the second live data search unit searches for live data with the data name.
The information management apparatus according to claim 5. When the live data cannot be searched by the broadcast, the first live data search unit refers to the global identifier assignment search unit to search for the live data with the data name that has become static data. To
The information management apparatus according to claim 6. An information management method in an information management apparatus for managing content information,
The information management device is
Classifying the content information based on the validity period and the number of generations per unit time of the content information;
When the validity period of the content information is less than a first threshold and the number of generations is greater than or equal to a second threshold, the content information is stored in a live data storage unit as live data;
Associating a global identifier with the specified information of the live data storage unit;
Linking the network address to the global identifier, and managing the live data by executing
An information management method characterized by that.

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